CONSTRUCTION MANAGEMENT PLAN METHOD ...

CONSTRUCTION MANAGEMENT PLANMETHOD STATEMENT & RISK ASSESSMENTS

CLIENT: PRIVATE CLIENT

CONTRACT: 18 DEVONIA ROAD, LONDON, N1-8JH

GROUNDWORKS & UNDERPINNING TO FORM LOWERED BASEMENT & EXTENDED BASEMENT, INTERNAL STRUCTURAL

WORKS

Method Statement: DR01 (REV 01) 30/09/17

Information Prepared by:Malcolm Furniss BSc(Hons), MCIOB, CMIOSH, CMaPS.KJV Construction Ltd Health & Safety ManagerEmail: [email protected]

01 30/09/17 Malcolm Furniss Incorporation – Islington Council Comments00 02/09/17 Malcolm Furniss Initial Issue

Rev No: Date: Written KJV Rev by Details

mailto:[email protected]

KJV MSRA – DR01 2 of 30

1.0 SCOPE OF WORKS

The work consists of the structural works to form the underpinning, underground and ground structure to lower the existing basement under an existing property, then extend the basement to the and rear largely via an open site works and underpin method.

The works will also include the underpinning of the vaults to enable the floor slabs to be lowered

The existing internal structure will be removed up ground floor and the rear part of the first floor, to be resupported on a concrete lining wall from the basement and internal structural steelwork.

At roof level a new mansard structure will be installed which will also serve to support the chimneys enabling those deemed to be removed to be carefully removed and the wall made good from roof level to existing basement level.

The underpins being formed within the existing structure as per plan and section extract below:


The existing structure will be retained whilst underpinning is undertaken.

The works will also comprise the drainage and suspended ground floor slab together with works to existing ground floor slab.

KJV CONSTRUCTION LTD will be working as a PRINCIPAL CONTRACTOR to a DOMESTIC CLIENT in accordance with CDM 2015.

Temporary works will be required to support the existing ground floor and first floor, as will temporary works to remove sections of rear façade, whilst new beams are installed and existing are re-aligned.

Note: The areas requiring temporary works will be refered to within this CMP/MSRA but the details will be provided by KJV CONSTRUCTION LTD TEMPORARY WORKS ENGINEER who are HLS LTD. Therefore a detailed MSRA for the Temporary works will then be issued – No Temporary works to be undertaken until the Temporary Works Drawings and MSRA have been issued.

The works will be undertaken in accordance with BARTON ENGINEERS - STRUCTURAL ENGINEERS

2.0 ATTENDANCES BY THE CLIENT

The following attendances will be required from The Client – or will be provided by KJV CONSTRUCTION LTD as PRINCIPAL CONTRACTOR:

1. Access to the works.


2. Spoil disposal points at reasonable distances from the works. Spoil removal to be booked in advance.

3. Background/access lighting.

4. 110v power and water supply.

5. Storage areas on site to be agreed on site

6. Liaison with Statutory Authorities.

7. Security of site.

8. Setting out points and level datums.

9. The surveying of ground for existing services and location clearly marked on the ground.

10. Health, Welfare and First Aid Facilities.

11. WELFARE ARRANGEMENTS – The use of separate Canteen and changing facilities, contained within Container Units. The Welfare will have Hot running water and will be regularly maintained. Welfare Contained within the building itself and relocated within the same area to accommodate works scheduling.

12. Asbestos Survey Report

13. Any Other Relevant Pre-Construction Information – Including F10 Submission

3.0 SELECTION OF PLANT

KJV CONSTRUCTION LTD will provide all necessary plant to carry out the works. This will include disc-cutters and wood cutting plant. All operatives using mechanical plant will have the required training and/or certification. The plant will include all necessary transport equipment and concrete compaction equipment.

Excavation will be by hand only.

Spoil will be removed via a SKIP loaded by hand and barrow – Subject to SKIP LICENCE (as per Traffic management)

The use of Mobile Cranes is not anticipated – no crane lifting will take place on the highway without the necessary permissions from the Council being in place.


4.0 METHOD STATEMENT

GENERAL

1. The general process will be as follows:

INTERNAL Set Up Site Structural Frame at Roof level Removal of Chimney Breast Form opening for spoil/plant access Temporary Works to Support Ground Floor Remove Existing Basement Floor Initial Reduce level excavation Install underpins in accordance with Structural Engineer’s details Install Lining/Retaining Walls in accordance with Structural Engineer’s details Temporary works to rear façade opening Reduce level excavation to formation Basement drainage Basement Slab

EXTERNAL – REAR Set Up Site Initial Reduce level excavation Install OPEN Site underpins/retaining walls in accordance with Structural

Engineer’s details Reduce level excavation to formation Basement drainage Basement Slab Lining Walls as Required

2. The Party Walls to adjoining properties may have been be underpinned by others under separate contracts, requiring only underpinning to areas not underpinned, or requiring reduce underpin depth

3. All materials will be transported/handled by Hand and internal hoist

4. Spoil will be removed from site via a SKIP in suspended parking bays outside in the highway – subject to licence .

5. Materials such as concrete for the, slabs, underpins and beams will be delivered via a chute or concrete pump directly in from the site compound area.

6. The suspended parking bay will only be used for skips and storage of materials – No materials will be left on the highway overnight, all skips will be covered and lit at night in accordance with the licence


7. Alternatively concrete will be delivered via bagged materials requiring site batching – for Non Reinforced elements only

8. The work areas will be surrounded by Movable Barriers which shall maintain the security of the area both during the working day, including break times, and after hours. Display appropriate signage.

9. The existing services will be marked clearly by others (i.e. Statutory Authorities) before the commencement of our works.

10. Copy of our Public Liability insurance has been provided. Cover will be taken for Public Liability of £10m.

11. The COSHH assessments for materials used on the works will be maintained by our site foreman.

12. Previous surveys of the site show that the services within the site are generally live so care will be taken with all excavations, references to existing services drawings will be made.

13. Dust will be kept to a minimum by means of work methods or dust control measures such as the use of sprinklers – to be assessed as work proceeds.

14. All personnel will be suitably trained for the tasks that they are to undertake. All operatives will be Health and Safety trained and CSCS card holders. All plant operators to have CPCS cards.

15. A copy of our Health and Safety Policy has been issued which gives our organisational chart for our company.

16. We will be abiding by KJV CONSTRUCTION LTD’s CONSTRUCTION PHASE PLAN for the Works.

17. We will abide by KJV CONSTRUCTION LTD’s Environmental Plan for the contract (to be issued). The environmental impact of this project should be minimal but we will undertake measures to reduce the effects of mud, dust and noise by controlling our activities and will ensure that all chemicals are stored and used in accordance with our COSHH assessments and care will be taken to ensure that no chemicals are released into the ground.

18. KJV CONSTRUCTION LTD – Have production and ENVIRONMENTAL IMPACT ASSESSMENT and will abide by the control measures as identified to mitigate the Impact – Issued Separately

19. On arrival on site our operatives will be inducted and informed of the site conditions.


20. Our site foreman will set up barriers around our works and liaise with all site users regarding movement of plant within the work area and how our works is to be scheduled with the work of other contractors.

21. MOBILE PHONE POLICY – no mobile phones will be allowed to be used on site, all operatives to use designated areas to use mobile phones. All operators of safety critical plant to have mobile telephones switched off when operating the plant.

22. Monitoring of HAND ARM VIBRATION: There will be instances of operatives using vibrating hand held plant. The site manager will have register of the plant and the limits of use and will monitor and record in our documentation the use by each individual operative on a daily basis – these documents will be in line with HSE requirements and available for inspection.

23. ABRASIVE WHEEL TRAINING: there are operatives trained and appointed by this company to use abrasive wheels. Should more be required for the duration of the works then a training course will be held on site by an independent trainer.

24. COMMUNICATION: As required two way radios will be used on site for management communication and communication with safety critical plant operators such as concrete pump drivers.

25. CONFINED SPACE/RESCUE PROCEDURES : When working below ground rescue procedures will be put into place to minimise risk to operatives and ensure that an operative below ground can be effectively removed to a place of safety. This will be subject to a separate document to be in placed with the required operatives briefed prior to commencement.

26. CERTIFICATION: All operative and plant certification will be made available to the Client prior to commencement on site.

5. ENVIRONMENT MANAGEMENT - SPILLAGES

1. Storage, handling of use of substances must not permit any chemicals to enter the ground or water courses or drainage and site management will control the site activities accordingly.

2. Any activities which produce hazardous waste must be suitably risk assessed, and waste disposed of in an appropriate manner via a specialist contractor.

3. It is the responsibility of the person causing or identifying a problem with deal with it as soon as possible to reduce any impact and ensure that harm is limited.

4. It is the responsibility of all persons to inform the site management of any spills, leaks or incidents relating to spillages so that (if necessary) it can be reported to the Environment Agency


5. FUEL: The fuel will be kept in a bunded tank or kept on a bund of at least 110%. Fueling will only be allowed in designated areas with spill kits available and fire fighting equipment. Any spillages will be contained and disposed of as contaminated material.

6. CONCRETE: Pump wash out will be contained in a bunded area and allowed to set hard before being broken up and disposed of as concrete. Contaminated water will, if necessary be pumped into settlement tanks before being allowed to run off.

7. In the event of a spill:

Stem the flow, divert away from drains and watercourses, use suitable PPE (eg. Gloves, safety goggles).

Surround the spill with absorbent materials (spill kit to be stored in suitable, close to hand position).

Segregate the absorbent materials used as “special waste” and store in a marked up container (eg. COSHH bin)

If it is a major incident contact the Environment Agency 24hr hotline on 0800 807060, complete SE form 43.

6 SITE LOGISTICS & TRAFFIC MANAGEMENT WORKS

1. To access the site all materials and spoil will be required to cross the footpath.

2. Therefore at any time there is a requirement to cross the footpath ROAD MARSHALS will be deployed with the sole aim to protect pedestrian.

3. The vehicles gaining access to the site will be required to unload kerbside in 2no suspended parking bays directly outside of the property. The length of the two bays being approximately 12m.

4. The vehicles delivering and removing spoil will be a maximum of 4 axle rigid vehicles with a maximum length of 9m.

5. The skip lorry to remove spoil will be 2 axle and 6m in length. The skip being placed on the highway and filled with barrows – Subject to skip licence.

6. The suspended parking bays and the footpath will be washed clean each night.

7. Deliveries and the removal of spoil will be between the hours of 0900-1500 Monday to Friday only as this is a residential area.

8. The access to the site will be via driving in from ISLINGTON GREEN as per TRAFFIC ROUTE given below:


9. he Street is shared with others and therefore vehicles movements will be managed accordingly.

10. The Road and Footpath will not be obstructed for public access at any time.


11. No materials or plant will be stored outside the boundary of the site, except within the suspended parking bays

12. Materials will be required to unload across the public area. Therefore at any time there will be a banksman on the road to protect the public and ensure their right of way when vehicles enter or leave the area.

13. All lorries entering the Road will require a banksman and will be required to contact the foreman before entering the area. At least operative will guide the vehicle and will be aware of other vehicles and pedestrians.

14. On completion, prior to leaving the area an operative will act as a guide to the vehicle out of the Road.

15. Around the parking bays barriers will be placed to protect the public.

16. The materials delivered to site will be stored on the space in the site only.

17. No excavations within the highway are not expected – but if required will not be undertaken unless the necessary licences are in place

7. NOISE AND VIBRATION CONTROL

1. Vibration will be kept to a minimum by initially detaching the existing structure from the surrounding structures by means of diamond saw cutting.

2. The Breaking of the concrete slab will cause vibration and will only be undertaken during times allowed for noisy working in itself will cause any vibration to the surrounding ground.

3. The existing ground floor slab will be broken up with small breaking plant, mainly owing to access which will again cause little in the way of vibration to surrounding structures. Where thick concrete is encountered then larger plant will be required and will work only during specified times.

4. There may be a requirement under Party Wall Matters for the monitoring of vibration and therefore we will endeavour to keep to a minimum, as described above, and will review matters if any complaints arise.

5. Noise will be monitored as sound level meters can easily record the level of sound. All plant used on the project will be low noise plant with an initial view to prevent the need for operatives to wear hearing protection on site. As there are surround walls which will enhance the sound,

6. The aim will be to ensure any sound emitted from the site is less than 80 dbA by recording the plant noise levels. To achieve this in practice the site entrance doors, will be kept closed at all times, when not in use.


7. Plant in the compound itself will be baffled or acoustic panels will be used to prevent noise in excess of 80 dbA being heard outside of the hoarding.

8. ATMOSPHERE/DUST CONTROL

1. Dust will be kept to a minimum by controlling adequately all works that could create dust.

2. The cutting of concrete will be wet cut and dry cutting of any masonry will also be prohibited.

3. The majority of works do not create any dust that can affect the public at large, but the use of the compound and road during dry weather will cause dust from the construction activity of movement of operatives, plant and materials.

4. To mitigate this general dust a jet wash will be deployed to wash the road and surrounding site areas at the end of each day and especially during hot or dry weather. This course of action may also be required during the day.

5. Dust from wood cutting operations will be localised within a cutting area within the site itself and will have no effect on the public.

6. The plant used within the building will often be diesel operated and will create exhaust fumes. To prevent a build-up of these fumes extractor fans will be deployed with exhaust coils to ventilated the area and extract the fumes to a higher level. The place of extraction will be carefully chosen to ensure that the fumes do not cause any issues with the surrounding residents.

9 FRONT ACCESS & ENABLING WORKS

1. The front façade is to remain during the underpinning works and therefore will require an opening formed to enable access for plant and materials. The opening will be formed using strongboy props to form a 1500 wide opening to the height required for access to the front lightwell.

2. Internally all of the non-load bearing walls will be removed from basement to ground floor. Leaving only load bearing walls.

3. The existing basement slab will be broken up using electric breakers or breaker on mini excavator for loading onto the conveyor.

4. At this stage an initial reduced level excavation can take place to the limit given by the temporary works engineer before which shoring to the existing foundations is required – expected to be in the region 300-500mm


5. Externally the ground can be reduced by a 500 approx ensuring that no foundations are undermined, this operation being undertaken by excavator, the material being excavated by hand and moved to the front of the building.

6. Internally a conveyor or hoist

10 WORKS TO SUPPORT INTERNAL FIRST FLOOR

1. There is a requirement to insert a new beam at first floor within the joist layout and to raise existing beams to within the joist layout.

2. This operation will involve the existing joists being supported on a designed temporary works system – this will be subject to a separate MSRA upon issue of Temporary Works Drawings.

3. The principle will be to support the joists each side of the beams with adjustable props with head and sole plates.

4. The joists will then be cut back to allow the beams to be installed at the correct level – using Geni-Lifts to install the beams.

5. The beams will bear on padstones which will be cut into the brickwork, with brickwork replace by insitu concrete.

6. The joists will then be re-spliced back into the beams.

11. WORKS TO EXISTING REAR FACADE WALL AND INSTALLATION OF TEMPORARY WORKS STEELS

1. The REAR FAÇADE has a section removed for access to the rear area, this work again will be confirmed by Temporary Works Design.

2. The underpins will be installed but to install the temporary steelwork over there will be a requirement to needle the walls over with SGB TITAN Props and 152UC Needles.

3. The needles will be installed by breaking pockets in brickwork and installing props either side as per photograph below:


4. Once installed the walls below can be removed and the steelwork installed. The steelwork being lifted into position using Genie Lifts and installed onto columns fix to underpin or pad foundations via Chemical fixed bolts

5. The stability of the structure and the correct installation of temporary works will be the responsibility of KJV CONSTRUCTION LTD as Principal Contractor’s TEMPORARY WORKS SUPERVISOR

12 ROOF AREA WORKS

1. The existing roof is to be partially removed by hand to install a new steel frame as per the Structural Engineer’s plan as below:


2. The steel work is of a relatedly light section to be able to be hoisted within the building. It will then be erected by hand and GENIE-LIFT.

3. The beams on the party wall will be supported via concrete padstones chased into the

existing party wall.

4. A beam will then be installed between the two main beams to support the chimney breasts.

5. The temporary works requirements will be to use STRONG-BOY PROPS which will take the load into the floors below – subject to Temporary Works Design.

6. This will then enable the chimney breasts to be carefully removed via light electric breakers from top down.

7. The walls will then be made good with the brickwork being faced up flush and rendered.

13 UNDERPINNING WORKS

1. The Underpin sequence will be in accordance with Structural Engineer’s Drawings working on a five pin sequence.

2. The principle of underpinning will be the same both internally and externally, the extent of earthwork support will depend on the depth with underpins up to 1000 in depth requiring minimal support.


3. In the rear and side area the underpins are open site and therefore are essentially constructed as buried retaining walls. Where there is no load on these walls they can be constructed in longer lengths possibly up to 5000 using a trenching method with vertical trench sheeting – this will require discussion with structural engineer to permit this type of construction.

4. The first operation will be to form the rear underpins in open site, this will enable works to proceed to the inside of the building, constructing both areas at the same time where logistically possible..

5. The works to the rear will also encompass the rear garden boundary walls which will also be underpinned in accordance with structural engineer’s details.

6. The aim will be to form the underpins as one complete underpin avoiding the need for undertaking the underpins in two levels.

7. The underpinning is a combination of under the walls and open site depending on wall conditions. As the wall construction is unknown the underpins will be individually assessed prior to works commencing, a typical detail is shown below, but this may not be the same elsewhere.


8. The underpinning principle will remain the same for all conditions once it is known that the wall is stable, if not the wall will require additional remedial works.

9. The underpinning to Perimeter will be initially underpinned, with only 25% of the underpins along each wall to ensure stability of the existing wall along area.

10. The underpins will not exceed 1200 in width and will be excavated by hand.

11. Temporary works will be required to support the ground, as excavation under proceeds, this will be via adjustable props supported on padstones to be in place until underpin is in place – to be supervised by the foreman,

12. The underpins in general will be cast with a toe either as one or a toe pour first. The depth of the underpin being in excess of 3000 will require earthwork support by close sheeting/ring shoring as detailed below.

13. In general the earthwork support will be as per the photographs/sketches below, being ring shored with timbers or adjustable props at maximum 1200 centre vertically.

14. If the ground within the building is poor quality then horizontal ring shoring will be deployed as per the photograph below. The trail holes indicate that this should not be necessary, but equipment to ring shore will be available on site.




15. The ground at the walls will be reduced further to excavate under the walls to install the underpins which will be undertaken in 1200 bays and in a five pin sequence to standard underpinning rules.

16. The pins will be excavated by excavator and by hand, with the excavator working to excavate and remove spoil up to 2000 in depth.

17. Care will be taken to prevent collapse of sides or ground from back of pin. The ground conditions will be monitored as work proceeds and close sheeting by excavating in 300 increments will be deployed to prevent any falling in of the ground. The rear shoring being set to the correct line to prevent over breaking.

18. Then reinforced before being shuttered at the front with plywood and timber (if reinforcement is required, otherwise mass filled)

19. For all of the walls a 100mm or 75mm kicker will be formed using a timber shutter. The kickers will be for single sided walls and will have reversed bolts to enable the base of the shutters to be secured.

20. The wall shutters will be made from timber forms for the non-fair face work with good one side plywood, fair-face work will be faced with POURFORM plywood to give a polished finish.

21. The shutters will be purpose made and built up by bolting into the required panels. The timber shutters will have 150x75 backing timbers.

22. The shutters will be prepared and then lifted into position using an excavator, or may be made in small panels to man-handled. In general, the outside shutter will be erected for easier access.

23. The reinforcement will then be installed in the walls against the outside shutter, or the underpinning itself. The steel fixers will either prefabricate the reinforcement for lifting in with the excavator or will fix the reinforcement insitu. The steel fixers will work off of the ground or will work on hop-ups consisting of a mobile scaffold tower or a safe-stand system.

24. The shutters will be through-bolted into the kicker. The bolting will be at no more than 1000 centres. Stop ends will be formed using timber and plywood.

25. The concrete will be poured into the shutter using a site batch and chute. Access to the shutters will be either from hop-up brackets attached to the shutter itself, or via a mobile scaffold tower on the base slab – depending on depth.

26. As the concrete fills the shutter it will be compacted using at least two internal vibrating pokers, though the use of external pokers will be considered. Special care and attention will be taken to adequately compact the concrete.

27. The shutters will be removed from the area to be cleaned and prepared for their next use.


28. The surface of the concrete, as struck, will be spray-cured with an approved non-staining curing spray.

29. To enable the underpins to work as one they will be doweled and to tie them together

30. The underpins will be cast with Readymixed concrete which will be transported from the entrance by barrow or via a site concrete pump

31. The concrete will be compacted with internal vibrating pokers.

32. The underpins will be cast to 75 below the existing footings and then will be dry packed the following day with a cement sand, 1:3 mix. A further 48 hours will be left before opening the adjacent pins

33. The underpins will be excavated carefully mindful of the close proximity of the adjoining properties.

34. The works will be closely supervised and where necessary undertaken as a confined space.

35. Monitoring of the party walls will be undertaken only if deemed necessary.

36. The underpins pits will then be backfilled with compacted selected excavated material prior to moving to the adjacent pin. The material to be used will be ballast type only that can be compacted with a plate compactor.

37. The ensure that the concrete does not over-break onto the neighbours side of the boundary, the excavation will be careful and if required inert fillerboard and foam will be installed to make up any excess voidage.

14. BASEMENT FORMATION WORKS

1. The excavation will be required to be undertaken in stages so as to ensure the structural integrity of the underpins, installing the temporary works shoring as the basement is excavated – to be determined by Temporary Works engineer.

2. The basement within the house has only a shallow excavation as only being lowered, similarly applying to rear extension.

3. As the excavation to formation proceeds the ground will be excavated a further 50 to enable a blinding of 50 of concrete to be laid between the toes of the underpins to maintain integrity of ground.

4. The spoil will be removed by hand on the ground loading out onto the hoist or conveyors to ground floor level.


5. This work will continue working into the works until all of the spoil is removed and the blinding is in place.

6. The drainage will be laid by locally cutting out the blinding and laying to falls in a shingle bed before reinstating the blinding, unless the drainage can be laid within the steel layers of the basement slab.

7. Then the reinforcement can be installed, loading out by hand from the compound area, with storage areas provided on site.

8. The concrete will be cast with Readymixed concrete which will be transported from the entrance by static pump, or via a mobile concrete pump.


10. The concrete will be laid in as few pours as possible using a concrete pump.

15 CONCRETE INTERNAL WALLS & COLUMNS

1. For all of the walls and columns a 100mm or 75mm kicker will be formed using a timber shutter. The kickers will be for double sided walls and will not require reversed bolts to enable the base of the shutters to be secured.

2. The wall shutters will be made from timber forms for the non-fair face work with good one side plywood, fair-face work will be faced with POURFORM plywood to give a polished finish.

3. The shutters will be purpose made and built up by bolting into the required panels. The timber shutters will have 150x75 backing timbers and the bolting will be through 150X75 Timbers or RMD SLIMSHORES.

4. The shutters will be prepared and then lifted into position by hand made in small panels to man-handled. In general, the outside shutter will be erected for easier access.

5. The reinforcement will then be installed in the walls against the outside shutter, or the underpinning itself. The steel fixers will either prefabricate the reinforcement for lifting in with the excavator or will fix the reinforcement insitu. The steel fixers will work off of the ground or will work on hop-ups consisting of a mobile scaffold tower or a safe-stand system.

6. The shutters will be through-bolted into the kicker. The bolting will be at no more than 1000 centres. Stop ends will be formed using timber and plywood.

7. NOTE: Where pouring against the party wall calculations will be provided to determine the maximum lift height of concrete to maintain the integrity of the Party Wall


8. The concrete will be poured into the shutter using a concrete pump or by hand and chute. Access to the shutters will be either from hop-up brackets attached to the shutter itself, or via a mobile scaffold tower on the base slab.

9. As the concrete fills the shutter it will be compacted using at least two internal vibrating pokers, though the use of external pokers will be considered. Special care and attention will be taken to adequately compact the concrete.

10. The shutters will be removed from the area to be cleaned and prepared for their next use.

11. The surface of the concrete, as struck, will be spray-cured with an approved non-staining curing spray.

16. MANHOLE WORKS (Inc PUMP CHAMBERS)

1. The first operation will be to check the likely positions of the manholes and check the invert depth.

2. The area will be CAT Scanned and the existing services will drawings will be checked.

3. The barriers will be set up around the likely area and the excavation works will be undertaken by hand. “NO ACCESS” and “DEEP EXCAVATION” signs to be placed on the barriers.

4. Hand excavation will generally be used to excavate but manholes in hard areas will require compressed air tools and disc cutters.

5. On excavation of a manhole the area it will be excavated around to enable there to be working space to access the manhole.

6. Earthwork support will be boxed out plywood and timber or trench sheets as excavations are likely not to exceed 1000. If this depth is exceeded the earthwork support will need to be reassessed before proceeding.

7. The manholes will be entered, from the inside and outside to break out at invert level to form a new inlet.

8. The flow to the manholes must be blocked off, otherwise confined space measures will be required.

9. The brickwork and manhole cover works will all be undertaken by hand.

10. The manhole shaft will be protected at all times with a plywood covering to ensure that nothing falls down the manhole.


11. Works are to take place in the manholes, any manhole over 1500 deep must be considered as a confined space and only accessed under confined space rules – subject to separate method statement if required.

12. The manholes will have new pipework existing and built into the benching, or into an existing inlet (if plastic bases), on completion the manhole base inside and out will be made good with sand and cement.

13. The Barriers will remain in place until the area is reinstated and left safe for the school users.

14. The spoil generated will be removed as work proceeds.

15. The HAVS rating of the Breaking equipment will be obtained from the hirer and the appropriate monitoring and action taken.

16. Once the manholes have been completed the drainage can then be laid away from them.

17. DRAINAGE WORKS

1. The aim is to pipe away from the existing manholes/pump station within the building adding in new connections and manhole as required.

2. The new drainage must be first connected into the pump station (if required). This will require a shaft to be excavated and supported with trench sheeting and struts and then the manhole can be broken into at high and low level to install new pipes.

3. The drainage trenches will be excavated and shored with trench sheets and adjustable props excavating between new manholes.

4. Where possible the drainage will be laid at between manholes before backfilling and reinstating.

5. The drainage will be bedded and surrounded in shingle and then backfilled with compacted excavated material.

6. The manholes will be constructed as work proceeds.

7. There may be a requirement for the use of compressed air tools to excavate the ground if it is hard.

7. If ground water is encountered it will be pumped out using a 50 submersible pump.



18. GROUND FLOOR WORKS

1. The suspended ground floor slab will be supported from temporary works.

2. The temporary works will be a designed KWIK-STAGE support system probably on 1200x1200 grid.

3. Onto the KWIK-STAGE, 150X75 primary timbers will be laid at 1200 centres with 100x75 timbers in the opposite direction, with a top surface of 18 Plywood.

4. The rear and side facades will be cut into at centres as per structural engineer’s details to allow the reinforcement to be installed into pockets. This will enable the concrete to the slab to do the same as a support to the slab.

5. The mesh and reinforcement will then be laid and spaced off of the soffit.

6. The concrete being placed using a concrete pump and compacted with internal vibrating pokers.

7. The concrete will be required to cure until reaching design strength before the temporary works can be removed.


19. PROGRAMME OF WORKS

The works are planned to take place as follows:Start on site to be agreed as MONDAY 18/08/17 - TBC, for enabling followed by Groundworks to be undertaken as per KJV CONSTRUCTION LTD’S Programme as agreed with The Client.

Programme duration for the Basement & Ground Works not to exceed 24 weeks.

It is anticipated that there will be one visit to complete the works.

20. MANAGEMENT STRUCTURE

Our management structure for the undertaking of the above works is to be as follows:

V EL HOYEK - Director Telephone No 0208 8087077Responsible for safety, quality and production.

TBA - Commercial ManagerMobile Telephone No TBAResponsible for commercial management of the project.

MALCOLM FURNISS - Visiting Safety Advisor Mobile Telephone No 07988 629423

C. EL HOYEK - Site Manager Mobile Telephone No TBA

TBA - Site Foreman Mobile Telephone No TBA

Any changes to the above will be conveyed to the client.It is envisaged that a crew of 6-8 operatives will undertake the work.

The identity of operatives will change throughout the works but all will be inducted on arrival.


21. HEALTH & SAFETY

Overall control of Health and Safety on site remains with KJV CONSTRUCTION LTD as PRINCIPAL CONTRACTOR who will be responsible for the specific safety arrangements and all necessary PPE for our works.The following hazards have been identified and the risk assessments are as follows:

1. MANUAL HANDLING2. TAKING DELIVERIES3. EXISTING SERVICES.4. WORKING WITH ABRASIVE WHEELS5. USE OF ELECTRIC BREAKING TOOLS.6. PROTECTING THE PUBLIC.7. EXCAVATION WORKS8. FIXING SHUTTERS9. CONCRETE WORKS10. STRIKING SHUTTERS11. CONVEYING/HOISTING12. WORK AT HEIGHT

As part of the training of the operatives the site foremen will be issued with a copy of this document and instructed to impart the information as necessary to the operatives. Generally this will be undertaken as part of the induction training, which should be given jointly between ourselves and the client to all operatives prior to commencement on site. KJV CONSTRUCTION LTD will undertake weekly safety visits to ensure Method Statement and Risk Assessments are being followed. (Formal recorded safety visit if required with report for foreman and main contractor)

PPE to be worn:-

Yellow High Vis. Jackets - at all timesHard Hats - at all timesProtective Boots - at all timesWellington Boots - when concretingGoggles - when using Abrasive Wheels and Conc. PumpEar Defenders - when undertaking noisy operations (i.e.

using breaking equipment or concrete poker)Gloves (Rubber) - when concretingGloves (Canvas) - when manual handling

Method statement briefings carried out by foremen prior to 0900 induction on the first day on site. This will require the foremen briefing the operatives and alerting then to the dangers on the site.Emergency procedures will be agreed with the Client to enable us to comply with the procedures laid down in the Health & Safety Plan. These are to be issued to all operatives as part of the induction process. Our site foreman responsible for carrying out the requirements.


Risk Assessment Risk Assessment Matrix

KEY

These Risk Assessments to be read in conjunction with Method Statement and Reassessed accordingly if work methods or site conditions changeDelete and Add as Appropriate

S = Severity L = Likelihood R = ResultNo Operation Those at

Risk Hazards S L R Control Measures S L R1. Deliveries and

collectionClearance of spoil & spillages

OperativesOther on siteVisitors

Delivery vehicles reversing onto site across pedestrian footpath.

4 4 16 Ensure that safety warning signage is visible and correctly placed, all vehicles to be banked onto/off site with CSCS banks man in full time attendance.

4 2 8

2. Excavation OperativesOther on site

Striking other operatives whilst lifting(200kg maximum)Striking Underground Services

5

5

4

4

20

20

Follow HSG 47. Refer to extg services drawings, CAT Scan area. Use insulated toolsShoring of excavation as per MSRA and Design

5

5

2

2

10

10

3. Moving Concrete/Spoil

OperativesOther on site

Manual handling and crush injuries. Contact with plant

4 4 16 Training of Operatives correct supervision use in the main of mechanical methods. set up and checked by foreman – checked weekly under PUWER

4 2 8

4. Manual handling of building materials and plant.


Manual handling injury due to lift or moving of materials.

3 4 12 Do not lift any materials in excess of 25ks’s; materials to be lift in tandem or by the use of the on-site hoist/excavator or lorry mounted crane.

3 2 6

5. Existing services, working in areas where services may be in existence


Personal injury to self and others, damage to services causing gas, water, electrical injuries.

5 4 20 All services to be located and detected and clearly marked

5 2 10

X 5 4 3 2 1

5 25 20 15 10 54 20 16 12 8 43 15 12 9 6 32 10 8 6 4 21 5 4 3 2 1

Project Address: 18 DEVONIA ROAD, LONDON, N1-8JH

Project No:

Underpinning & Ground & Structural Works JOB/TASK: Underpinning,

Ground & Concrete Works

X 5 4 3 2 1

5 25 20 15 10 54 20 16 12 8 43 15 12 9 6 32 10 8 6 4 21 5 4 3 2 1

Low 1-6 Medium 8-12 High 15-25

Risk Assessment Matrix

SEVERITY LIKELIHOOD No Injury 1 Almost Never

Minor Injury 2 Seldom>3 day Injury 3 PossibleMajor Injury 4 Probable

Death 5 Frequently


6. Working with cutting, grinding abrasive wheels, cutting trench sheets or reinforcement.


Cutting and or grinding can cause sparks, possible fires, eye injuries, burns to exposed skin, cuts and flying debris.

4 4 16 Only to be used by trained operatives, wearing the correct PPE, issue of hot works permits and adjacent fire extinguishers.

4 2 8

7. Use of electrical tools and equipment, breaking, cutting, lighting, pumping.


Electrical injuries, cuts with use of faulty equipment, spalling and flying particles, vibration white finger.

5 4 20 Use of appropriate PPE, gloves, boots, eye and ear protection, used by experienced operatives, rotate operatives and regular monitoring/recording.

5 2 10

8. Protection of the public, undertaking works close to a public area/footpath

OperativesOther on sitePublic

Persons entering work area causing injury, contact with lifting materials or moving plant and or deliveries.

4 4 16 Warning signage to be placed (visible) site hoardings to be closed at all times with banks man in full attendance to deliveries/moving plant.

4 2 8

9. Underpinning Operations.


Collapse of Ground and trapping of men under ground

3 4 12 Shoring of ground and checking by supervisor. Wearing of the appropriate PPE, gloves, protective glasses and long sleeved shirts.

3 2 6

10. Concreting works, pouring concrete with via a timber chute to lower levels.


Splashing from concrete can cause burns to skin, irritant to eyes. Noise and vibration to hands and arms.

4 4 16 Wearing of PPE to cover eyes with appropriate foot wear (welly boots) ensures that clean water and eye washing is locally available.

4 2 8

11. Working on shutters and installing of edge protection.


Falls from height during concreting, possible water/concrete can make working area additionally slippery.

5 4 20 All open areas to have fixed barrier with gated entrance, all access/egress ladders to be fixed. Regular cleaning /washing down /sanding of works area.

5 2 10

12. Loading and unloading of deliveries.

OperativesOther on sitePublic

Striking operatives whilst lifting, falls/falling materials, slipping and falls from lorry bed, unsafe/unstable material loads.

4 3 12 All materials to be checked upon arrival, where possible materials to be pre-slung, lorries to have hand rails, or slingers to have harness, fall arrester attached to excavator/lorry crane.

4 2 8

14. Temp works to support steelwork or concrete


Personnel injury, property damage.

4 4 16 Ensure supervised, all operation at ground levelWork to temp works eng design

4 2 8

15. Working where animals may have been


Weils disease, anthrax, tetanus, – Immediately cease work and contact the Safety Manager, Supervisor(s).

3 4 12 Cuts and bruising to be covered with a suitable medical dressing prior to starting work. Ensure PPE is worn and hygiene standards are maintained as instructed by supervisors.

3 2 6


18. Remove spoil and spillage from working area.


Slips, trips and falls due to spoil heap in close proximity of works.

4 3 12 Ensure that the working area is kept clean by removing spoil into waste skips. Wear PPE. If a waste skip is on the public highway, ensure it is coned off and lit at night.

4 2 8

19. Use of Compressed air Excavation Equipment

Operatives and other on site

Blowing of air lines, overturning of equipmentExcessive noise

4 3 12 Ensure loads are proportionate, check equipment and brace as necessaryCheck equipment dailyHearing Protection zone to be established

4 2 8

20. Use of Lifting Equipment


Overturning, dropping loads 5 4 20 Ensure competent operators and LOLER Checks dailyEnsure secured correctly and checked by competent person

5 2 10

21. Temp Wks to underpins and formwork


Collapse of Temp works 5 4 20 Ensure installed as per design – check by TWS and TWC before loading

5 2 10

Additional Risk Assessments

22.

23.

24.

Assessor Signature :

M.FURNISS, CMIOSHKJV CONSTRUCTION LTD Health & Safety ManagerDate 30/09/17


The following personnel have been instructed on the contents of the works RISK ASSESSMENTS. They are deemed to have been informed of their role and responsibilities.NOTE: “DO NOT IMPROVISE. IF IN DOUBT ASK” Any Deviations from this Method

Statement/Risk Assessment to be report to Site Supervisor for Reassessment of Works

18 DEVONIA ROAD, LONDON, N1-8JH

UNDERPINNING, GROUND WORKS & STRUCTURAL WORKS – METHOD STATEMENT & RISK ASSESSMENTS - REV01 30/09/17

By signing below I confirm that I have a clear understanding of the briefing as above

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