Neru Kalip i̇ngi̇li̇zce Sunum

TUNNEL FORMWORK SYSTEM

TUNNEL FORMWORK SYSTEMThe tunnel formwork system is a construction system that is based on the in situ concreting, which allows to pour the large elements, the slabs and walls of a structure in a single time.

With the help of the tunnel formworks, the load-bearing elements of the structure are produced as reinforced concrete, the aprons foundations, roof and the main part of the finishing stages are realized in a conventional method.

The external and internal partitions walls are realized with the help of the panels mainly produced and ready on site. The tunnel formwork system allows the pouring of 3 walls, at most, of a structure at the same time.

TUNNEL FORMWORK SYSTEM

The tunnel formworks are divided in two types : Full tunnel formworks Half tunnel formworks

FULL TUNNEL FORMWORKS

HALF TUNNEL FORMWORKS

MAIN ELEMENTS

Formworks surfaces,Adjustable prop,Adjustable diagonalHorizontal pattern, JackAdditionalformwork elementsWorking platform

FORMWORK DIMENSIONS

For the half tunnel system also in force in our contry; Formwork's depth 62.5, 125, 250 cm and multiples, Width from 105 cm and mutiple of 30 cm, Maximum slab opening 550 and 600 meter, Formwork's height 246, 250, 256 meter. The height in question, is taken from above the slab to the bottom of the upper slab.

TUNNEL FORMWORK WORKING PLATFORM

TUNNEL FORMWORKS DESIGN PRINCIPLES The structure's design must be suitable to the formworks dimensions. The structure's load-bearing walls must follow each others and installed in equal openings in order to decrease the number of type of formworks. The high rise building's walls must be upright to each others in two directions. Thereby, the structure can support the loads in both directions, because of the horizontal loads, the increase of the traction and section of the walls is avoid. To obtain the uprightness of the walls and the assembly of the tunnel formwork, the walls commencement elements (plinth) are installed to 10-12 cm high on the slab. A special smooth formwork is used with the tunnel, for the walls constituent the external shell. The formworks in question must be suitable to each parts of the tunnel formwork. The structures with upright angles are preferable. The most economical slab opening is between 5.50 and 6.00 meter.

TUNNEL FORMWORKS APPLICATION PRINCIPLES The floor height must be constant on the same floor. Low slab is not recommended for wet areas. The construction method of the basement level's walls is determined by the structure's pit's section. There is no limit about the minimum number of floor. The maximum number can be increased after solving the crane's problem. However in our country, the wisest application is between 6-15 floors. Regarding the plan of general installation of the building's blocs, the movement axis of the crane's boom (boom handle opening) is essential. Climbing formworks, prepared elements or conventional method are used pertaining the shaft's production. External facade walls are realized in situ with the conventional method or with ready alloys. The reduction of the differences of the door's dimensions and types is preferable.

vardır.

Usually, the basement level's height is higher (for example 4.00m) compared to the standard floor height, and to obtain the standard tunnel's height (1.40m) the walls are poured in the conventional method, then the tunnel formwork is installed on the next level ( this floor is also the floor of the assembly and disassembly of the formworks) with the first concrete axis to start the pouring process.

Restrictions about the reservation's dimensions, shape and number.

The assembly and disassembly of the formworks in the reservations inside the formworks, is a waste of time. For that reason, the slab reservations must be both in the same dimensions and placement during the planning.

The door on the wall must be designed in equal dimension and placement. In contrary case, there will be a disruption and waste of time on the work program.

DISADVANTAGES TO USE THE TUNNEL FORMWORK SYSTEM

The most important disadvantage of the tunnel formworks is its weight. A crane is required. The structure's design affects the formwork's dimensions. The floor's height must be constant on the same floor. A low slab is not recommended on the wet areas. The construction method of the basement level's walls is determined by the structure's pit's section. More the tunnel formwork is repeated more it is economical.

The Tunnel Formwork Application Project Sample.

ERRORS OF APPLICATION

The walls and slabs are poured along with this tunnel formwork system, inadequate vibrator application and due to the negligence of the workers during the concreting process such a gap has occured.

ERRORS OF APPLICATION

Due to the installations cables and the inadequacy of the vibrator applied, the concrete didn't hold.

NERU FORMWORK SYSTEM'S FACTORY