Load Transmission, Fatigue Strength, Riding Comfort and Traffic Safety with anchor studs for rigid connec- tion to the adjacent conrete. In the case of steel bridges the edge con- struction is supported on consoles or supporting girders parallel to the end cross girder. Riding Comfort and Traffic Safety Due to the relatively small expan- sion joint surface exposed to traffic compared to the movements to be accommodated, the riding comfort is excellent. The steel surface of the joint divided into small gaps requires no additional treatment to make it skid-proof. Tests have shown that no significant increase of the impact effect by the tyre occurs up to a single gap width of 80 mm for modular expansion joints. However, it is particularly important that a flush interface is provided between the road surface and the expansion joint. MAURER Modular Expansion Joints Expansion joints have the task of bridging structural gaps by com– plying with the following require- ments: 1. Accommodation of loads and movements by safe transmission of traffic loads rigid and shallow anchorage in the structural components low detriment to carriageway surface continuous adaption to defor– mations in the structure low resistance to deformation 2. Durability of joint system and its adjoining components due to absolute watertightness high fatigue strength resilience, i.e. unrestrained and damped support of all movable components use of materials resistant to aging, corrosion and wear maintenance-free design 3. Low noise emission under traffic due to avoidance of surface irregu– larities sealing elements, which are not subjected to traffic loads preloaded bearing components made of high-grade synthetics. 4. Efficiency Girder Grid Joint type D 560 Stress optical investigation into the connection centre beam – support bar at the technical university of Innsbruck Anchorage of the edge beam MAURER Modular Expansion Joints MAURER Modular Expansion Joints comprise of steel centre beams arranged in the longitudinal direc- tion of the joint with interposed strip seals. Due to individual gaps being restricted in width several strip seals must be employed in series to accommodate greater movements. Accordingly one or more centre beams are required between the edge beams, supported on cross bars movably arranged at one or both edges of the structural gap. MAURER Girder Grid Joints In the MAURER Girder Grid Joint each centre beam is rigidly welded to its assigned support bar, thus resulting in a girder grid which is capable of moving within itself. Control springs arranged between the support bars control the spacing of the centre beams as a function of the overall width of the structural gap. The support bars are aligned in the direction of movement of the struc- ture. Movements deviating from this arrangement can be accommodated to a limited degree. This straightforward and, therefore, reliable design is highly economic when a certain number of sealing elements (2 to 8) is not exceeded. In situations where limited space is available on one side and the move- ment range is unusually large or when movements have to be accom- modated in differing directions or for extending the application range of MAURER Modular Joints the MAURER Swivel Joist Joint is the alternative. More than 1.000km of MAURER Modular Expansion Joints are in place worldwide, this figure making us one of the leaders in Europe and Overseas in the field. The basis for the design of this long-life and practically mainte- nance-free modular system is more than 30 years of research and development in close liaison with established technical universities and leading scientific institutes, proving its capability of with- standing extreme loading whilst being practically maintenance-free. MAURER Modular Expansion Joints are designed for road and railway bridges, parking decks, buildings, ramps, footway bridges, airports and many other facilities; among them such prestigious structures as River Rhine Bridge A 42 near Duisburg/Germany Storebælt East Bridge and Oresund Bridge, Denmark Vasco da Gama Bridge, Portugal Jiangyin Yangtze River Bridge, China Safe Load Transmission Vehicles travelling over the expan- sion joint transmit vertical and horizontal loads to the centre beams. The section forces resulting from the eccentric wheel loads are transmitted to the support bars by means of the centre beam. This beam acts as a continuous girder. From there they are diverted into the edges of the structure via the supporting elements and control springs. The edge beam is rigidly anchored in the structure. For fatigue reasons the traffic loads are transmitted via anchor plates into the adjacent reinforced concrete construction. The support boxes are equipped Load trans- mission at the centre beam High Fatigue Strength Expansion joints are subject to high dynamic stresses due to vehicle loads. Whilst demonstrating the safe load carrying capacity by structural analysis gives a theoretical indica- tion of the suitability of an expan- sion joint. Proving its fatigue strength is mandatory in estima- ting its lifetime. Expansion joints are subjected to intensive axle loading. In field tests the precise load de- formation behaviour was measured for various test situations (braking, starting, driving over) and under normal traffic conditions, from which reliable static systems were established to find out how com- ponents are stressed under wheel loads. To regulate the various notch categories the fatigue behaviour was determined on all components of the system in the lab using load combinations approximating to that of actual conditions. H V V M H Versatility Technical approval and independent periodical inspection acc. to TL/TP-FÜ 8 10 9 11 3 7 6 5 4 2 1 Continuous in-house and field quali- ty control, the use of high-grade materials and a quality assurance system in keeping with ISO 9001 and EN 29001 ensure the high standard of MAURER Girder Grid Joints. All design elements of MAURER expansion joints are engineered in high-quality materials. All synthetics used feature excellent resistance to aging, wear and the environment. Relaxation of the control and bearing elements is insignificant even after decades of service. The sealing elements are insensitive to physical stress. National regulations are to be taken into account in the choice of the corrosion protection system. We recommend using two-part zinc-rich paint as the primer and epoxy- based micaceous iron as the finish. Designation Description Supporting Elements 1 Edge Beam Hot-rolled section of steel grade S 235 JR G2 precision tolerances combining good weldability with notch toughness. Can be both shop and site butt-welded. 2 Centre Beam Hot-rolled section of steel grade S 355 J2 G3 precision tolerances combining good weldability with notch toughness. Can be both shop and site butt-welded by patented system. 3 Support Bar Steel grade S 355 J2 G3, machined for precision tolerances. Supports 4 Sliding Plate Stainless steel in bridge bearing quality. Sliding surfaces ground and polished. Material no. 1.4401. 5 Sliding Spring Natural rubber steel laminated, vulcanized in place. Sliding surfaces of PTFE. 6 Sliding Bearing Chloroprene rubber with steel spherical inlay vulcanized in place to handle tilt loading. Sliding surfaces of PTFE. Control Elements 7 Control Spring Cellular polyurethane of high tear strength, insensitive to oil, gasoline, ozone. High resistance to aging, high self-damping. Sealing Elements 8 Strip Seal 80 Chloroprene rubber or EPDM with high tear strength, resistant to salt water, oil and aging, available in any length. Can be vulcanized in place on site. Anchorage 9 Carriageway Anchor Steel plate and loop from S 235 JR G2. 10 Anchor Stud St 37K 11 Support Box To accommodate the sliding bearings, sliding springs, control springs and support bars.
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Load Transmission, Fatigue Strength,Riding Comfort and Traffic Safety
with anchor studs for rigid connec-tion to the adjacent conrete. In thecase of steel bridges the edge con-struction is supported on consoles orsupporting girders parallel to theend cross girder.
Riding Comfort and Traffic Safety
Due to the relatively small expan-sion joint surface exposed to trafficcompared to the movements to beaccommodated, the riding comfortis excellent.
The steel surface of the joint divided into small gaps requires no additional treatment to make it skid-proof.
Tests have shown that no significantincrease of the impact effect by thetyre occurs up to a single gap widthof 80 mm for modular expansionjoints. However, it is particularlyimportant that a flush interface isprovided between the road surfaceand the expansion joint.
MAURER Modular Expansion Joints
Expansion joints have the task ofbridging structural gaps by com–plying with the following require-ments:
1. Accommodation of loads and movements bysafe transmission of traffic loadsrigid and shallow anchorage inthe structural componentslow detriment to carriagewaysurfacecontinuous adaption to defor–mations in the structurelow resistance to deformation
2. Durability of joint system and its adjoining components due toabsolute watertightnesshigh fatigue strengthresilience, i.e. unrestrained anddamped support of all movablecomponentsuse of materials resistant toaging, corrosion and wearmaintenance-free design
3. Low noise emission under traffic due toavoidance of surface irregu–laritiessealing elements, which are notsubjected to traffic loadspreloaded bearing componentsmade of high-grade synthetics.
4. Efficiency
Girder Grid Jointtype D 560
Stress optical investigation into theconnection centre beam – support bar
at the technical university of Innsbruck
Anchorage of the edge beam
MAURER Modular Expansion Joints
MAURER Modular Expansion Jointscomprise of steel centre beams arranged in the longitudinal direc-tion of the joint with interposed strip seals. Due to individual gaps being restricted in width several strip seals must be employed in series to accommodate greater movements.Accordingly one or more centrebeams are required between theedge beams, supported on cross barsmovably arranged at one or bothedges of the structural gap.
MAURER Girder Grid Joints
In the MAURER Girder Grid Jointeach centre beam is rigidly weldedto its assigned support bar, thusresulting in a girder grid which iscapable of moving within itself.Control springs arranged betweenthe support bars control the spacingof the centre beams as a function of the overall width of the structuralgap.
The support bars are aligned in thedirection of movement of the struc-ture. Movements deviating from this arrangement can be accommodated to a limited degree.
This straightforward and, therefore,reliable design is highly economicwhen a certain number of sealingelements (2 to 8) is not exceeded.
In situations where limited space isavailable on one side and the move-ment range is unusually large orwhen movements have to be accom-modated in differing directions or for extending the application rangeof MAURER Modular Joints theMAURER Swivel Joist Joint is thealternative.
More than 1.000km of MAURERModular Expansion Joints are inplace worldwide, this figure makingus one of the leaders in Europe andOverseas in the field.
The basis for the design of thislong-life and practically mainte-nance-free modular system is morethan 30 years of research and development in close liaison withestablished technical universitiesand leading scientific institutes,proving its capability of with-standing extreme loading whilstbeing practically maintenance-free.
MAURER Modular Expansion Jointsare designed for road and railwaybridges, parking decks, buildings,ramps, footway bridges, airportsand many other facilities; amongthem such prestigious structures as
River Rhine Bridge A 42 nearDuisburg/GermanyStorebælt East Bridge andOresund Bridge, DenmarkVasco da Gama Bridge, PortugalJiangyin Yangtze River Bridge,China
Safe Load Transmission
Vehicles travelling over the expan-sion joint transmit vertical and horizontal loads to the centrebeams. The section forces resultingfrom the eccentric wheel loads aretransmitted to the support bars by means of the centre beam. Thisbeam acts as a continuous girder.From there they are diverted intothe edges of the structure via thesupporting elements and controlsprings.
The edge beam is rigidly anchoredin the structure. For fatigue reasonsthe traffic loads are transmitted via anchor plates into the adjacent reinforced concrete construction.The support boxes are equipped
Load trans-mission at the centre beam
High Fatigue Strength
Expansion joints are subject to highdynamic stresses due to vehicleloads.
Whilst demonstrating the safe loadcarrying capacity by structural analysis gives a theoretical indica-tion of the suitability of an expan-sion joint. Proving its fatiguestrength is mandatory in estima-ting its lifetime. Expansion jointsare subjected to intensive axle loading.
In field tests the precise load de-formation behaviour was measuredfor various test situations (braking,starting, driving over) and undernormal traffic conditions, fromwhich reliable static systems wereestablished to find out how com-ponents are stressed under wheelloads.
To regulate the various notch categories the fatigue behaviourwas determined on all componentsof the system in the lab using load combinations approximatingto that of actual conditions.
H V
V
M
H
Versatility
Technical approval and independentperiodical inspection acc. to TL/TP-FÜ
8
10
9
113
76
54
21
Continuous in-house and field quali-ty control, the use of high-gradematerials and a quality assurancesystem in keeping with ISO 9001and EN 29001 ensure the highstandard of MAURER Girder GridJoints.
All design elements of MAURERexpansion joints are engineered inhigh-quality materials. All syntheticsused feature excellent resistance toaging, wear and the environment.Relaxation of the control and bearing elements is insignificanteven after decades of service. The sealing elements are insensitive to physical stress.
National regulations are to betaken into account in the choice ofthe corrosion protection system. Werecommend using two-part zinc-richpaint as the primer and epoxy-based micaceous iron as the finish.
Designation Description
Supporting Elements
1 Edge Beam Hot-rolled section of steel grade S 235 JR G2 precision tolerances combining good weldability with notch toughness. Can be both shop and site butt-welded.
2 Centre Beam Hot-rolled section of steel grade S 355 J2 G3 precision tolerances combining good weldability with notch toughness. Can be both shop and site butt-welded by patented system.
3 Support Bar Steel grade S 355 J2 G3, machined for precision tolerances.
Supports
4 Sliding Plate Stainless steel in bridge bearing quality. Sliding surfaces ground and polished. Material no. 1.4401.
5 Sliding Spring Natural rubber steel laminated, vulcanized in place. Sliding surfaces of PTFE.
6 Sliding Bearing Chloroprene rubber with steel spherical inlay vulcanized in place to handle tilt loading. Sliding surfaces of PTFE.
Control Elements
7 Control Spring Cellular polyurethane of high tear strength, insensitive to oil, gasoline, ozone. High resistance to aging, high self-damping.
Sealing Elements
8 Strip Seal 80 Chloroprene rubber or EPDM with high tear strength, resistant to salt water, oil and aging, available in any length. Can be vulcanized in place on site.
Anchorage
9 Carriageway Anchor Steel plate and loop from S 235 JR G2.
10 Anchor Stud St 37K
11 Support Box To accommodate the sliding bearings, sliding springs, control springs and support bars.
Trägerr. Dehnf. Satz 08.08.2002 14:12 Uhr Seite 2
75c
70
e25 40
ab
h
tF f tF
lF
Cross-sectionthru carriageway
at support box
70
a
150 va
r.15
0
t1,Gt1,G flG
150
70
flG
t1,Gt1,G
150
var.
Cross-sectionthru footway
with strip seal80 G withoutfootway cover
plate
f t2,Gt2,G
d
150
var.
Cross-sectionthru footway
guide unit (alternative 1)
Cross-sectionthru carriagewaybetween supportboxes
Cross-section thru footway (alternative 2)
Cross-sectionthru footwaywith cover plate
Cross-sectionthru footwayguide unit (alternative 2)
Cross-sectionthru footway
(alternative 1)
crossgirder
continuousgirder
cantilever
Design and Product DataVersatility
To assist dimensioning, the salientdesign data is listed in the table,whereby departures are possible within certain limits where spaceavailability is restricted. All dimen-sions are nominal and will be deter-mined according to project. Thesedimensions are measured at a rightangle to the axis of the joint and for angles α of 45° to 90° betweenthis axis and the direction of movement. Dimensions for smallerangles or larger movements are available on request.
The form of reinforcement shown ismerely a proposal. For reinforce-ment in the area of the carriage-way and footways we recommend a hoop-shaped reinforcement of weldable 16mm dia. rebar on acentre-spacing of 200mm in conjunction with longitudinal rein-forcement of the joint and a meshreinforcement of the gap beneaththe joist boxes.
Cross-section
Plan view
Salient design features can be seenfrom the following figures:
Support on continuous girder
fixed point
Designing an expansion joint isgoverned by the magnitude anddirection of the main movement ofthe structure in the plane of the carriageway, this being determined in a girder grid joint by the number of expansion gaps and the arrange-ment of the support bars runningparallel to this direction, whereasthe edge and centre beams are located parallel to the edges of thestructure.
In addition to the normal antici-pated movements in the plane ofthe carriageway, a multitude ofsecondary movements can occur.
E.g. rotations ϕz due to irregularincreases in temperature, move-ments uy due to abutment settingsand the resilience of neoprene bearings, movements uz resultingfrom cantilever bridge ends. Also tobe taken into account are move-ments uz resulting from jacking upthe superstructure, for instance,when replacing bridge bearings andfrom the difference between the longitudinal inclination of the carriageway and the horizontal arrangement of the bearings.
The MAURER Girder Grid Joint iscapable of handling all such move-ments safely.
Designing and dimensioning expansion joints in Germany is dic-tated by the TL/TP-FÜ (TechnicalDelivery Instructions and Test Spec-ifications) of the Federal Ministry of Transport. MAURER Girder GridJoints are approved accordinglyand are subjected to independentperiodical inspection.
To determine movements accord to German Standard DIN 1072 consideration has to be given to acombination of the following factors:
thermal effectsprestressshrinkage and creepsuperstructure deformationssubstructure deformations
The following extreme temperatureranges govern the design of expan-sion joints in addition to normalbridge design consideration:
1. For steel and steel/concrete bridges +75°C/-50°C
2. For concrete bridges and bridgeswith rolled beams concreted in place +50°C/-40°C
The expansion joint design can be finalised on the basis of sitetemperature measurements prior
to installation and following finalconnection of the structure with thefixed bearings. The extreme tempera-ture values can then be reduced by
±15°C for bridges according to (1)and±10°C for bridges according to (2)
The functional range of the stripseals is 0 thru 80mm perpendicularto the joint (ux) and – 40 mm thru +40mm parallel to the joint (uy).
All MAURER expansion joints aredesigned to take movements of 80mm per joint gap and thus thetype designation results as a multiple of 80. According to the requirements of ZTV-K (AdditionalTechnical Contract Provisions forEngineering Structures) a movementrange of 5 to 70 mm, thus 65 mm,is allowed in Germany. This limitingvalue applies measured perpendicu-lar to the joint axis.
The total movement “u“ in the main direction of movement can be resolved into the two componentsux and uy perpendicular and parallel to the direction of the joint respectively. Selecting the size ofjoint is governed by the componentux and the maximum permissiblegap width.
Steel BridgeDesign alternatives for connection to steel decks
Concrete Bridgetypical cross-section and plan view foranchorage in reinforced concrete
Support onsingle cantilever
Anchoring in concrete structures is governed by the design data astabulated beside.
For steel structures our engineeringoffices formulate solutions tailoredto individual requirements.
y
x
y
x
u
uq
u
uy ux
uz
MAURERexpansion admissible concrete concrete
joint movement design data recess dimensions gap dimensions
n type a[°] ux uq uz a b c d h tF t1,G t2,G fmin fmax lF lG
Resilient Control,Resilient and Prestressed Support
Watertight Connection, Installation,High Functional Reliability and Low Noise Emission
Resilient Control
MAURER Girder Grid Joints adaptcontinually to deformations in thestructure. The control springs provided between the support bars ensure a uniform distribution of thetotal movement to the individualjoint gaps. Steel stops are providedat the support bars to prevent anopening of the individual gap ofmore than 80mm.
The springs comprise mainly of closed-cell polyurethane, a materialwhich has a proven record of success for spring elements exposedto dynamic and impact stresses. The high permissible deformation(up to 80% compression defor-mation relative to the original freelength) permits the production of elements with high permissiblespring deflection for a compactdesign. The natural damping effectof the material affords vibrationand impact damping of dynamicallystressed components.
The special arrangement of thestops for securing the controlsprings to the support bars has theeffect that the wider the openingof the joint the more the springsare compressed. The springs arecompressed in any opening condi-tion of the joint, the precompres-sion being at a minimum when thejoint is closed. Advantages of thiscontrol system are as follows:
adaptability to production toleranceshigh reliabilitydurabilityinsensitive to movement constraintsnoise dampingsingle gap increase possibleduring repair
The reaction forces resulting fromthe elastic deformations of the stripseals and the control springs areindependent of how many of theseparts are involved because theyfunction as a series arrangement ofsprings.
Resilient and Prestressed Support
The support bars of the MAURERGirder Grid Joint are supported byresilient bearing elements i.e. precompressed spring and slidingbearings, located above and below the support bars respectively in the support boxes. This arrange-ment provides a resilient and sliding support in the direction ofthe structure movement. Pre-compression of the sliding springsprevents the supports from liftingoff the bearings and also compen-sates for manufacturing tolerances.The support resilience also servesto eliminate edge pressure in thesliding surfaces.
To compensate for unavoidable differences in height between theedges of the structure, the slidingbearings have been designed toaccomodate the resultant incli-nation of the support bars and toreduce the torsional stiffness.
The Control Principle
Opened joint, cross-section
Opened joint, plan view
Closed joint, cross-section
Closed joint, plan view
Control of MAURER Girder Grid Joints
Watertight Connection
To protect the adjacent structuralparts from the penetration of dirtand aggressive surface water MAURER Girder Grid Joints featurewatertight strip seals to close thegap between the individual steelbeams watertight. The MAURER stripseal has become most popular inmodular seals systems.
The strip seal is made of EPDM rubber with a bulbous-shaped edge. This is installed in a claw in the edgebeam and centre beams without theneed for additional clamping bars.The connection is watertight andsecure, with the peeling element setbelow the road surface level. It isprotected against direct wheel orsnowplough contact.
With its preformed articulated section it is possible to move thestrip seal in direction x without anyappreciable build-up in reaction forces. Movement in direction z causes deformation of the sealingelement.
Sealing elements can be replacedeven when the individual gaps are ≥25mm. The gap width can be enlarged by moving the centrebeams. This operation is carried outusing special hydraulic equipment.
The bulbous edge section of the sealing element locks it in the steelclaw and is capable of withstandingwheel pressure on any impurities(e.g. stones, grit, snow etc.).
The sealing element adapts to different kinds of joint design andbridge cross sections.
For the protection of the structuralconcrete and the substructures theinterface of the edge beams to thewaterproofing layer(s) of the bridgemust also be watertight. For this purpose the edge beams of MAURERGirder Grid Joints feature an 80 mmwide horizontal steel flange.
Installation
Installation is usually realized by ourspecial fitters and according to thevalid work instructions.
High Functional Reliability
Within their anticipated lifetime nomalfunction of MAURER expansionjoints is expected, but despite this,all synthetic components can be replaced with minimum effort.Touching up the corrosion protec-tion system is required during maintenance as is normal for steel structures.
Low Noise Emission
Carriageway expansion joints alsoadd to this noise, the causes ofwhich have been investigated inextensive research by Maurer Söhneto enable MAURER Girder GridJoints to be optimized in this respect.
Residents in the vicinity of suchexpansion joints find the suddenchange in the noise pattern particu-
Insertion of strip seal into the edge beam
Detail Features
40mm gap width, mid position
Deformation features of the
strip seal
80mm gap width, max. position
150mm gap width, over-expanded position
larly disturbing, the criteria for whichis not so much the noise level asmeasured but the magnitude of thefleeting change in frequency and thepulsed element of the noise pattern,whereby a basic distinction is madebetween noise emitted upwards from the carriageway and the noiseprojected downwards through the gap between the two structural components.
All supporting elements of MAURERGirder Grid Joints which are exposedto traffic loads are supported byhigh-quality resilient synthetics which distinguish such designs from thosehaving rigid support. The structuralgap can be dammed downwards.Maurer Söhne offers tailored solu-tions for each and every application.
Noise control to the top is effectedby optimizing the road surfacingconnection and supporting thewheel when crossing the joint.Angular joint design, finger-type bridging and joint sealing afford relief.
Watertight designof parapet
Horizontal bend and kerb units
Connection of amodular joint to
a single seal joint
Intersection withrail of tram
Special kerb unit
control spring
control spring
stop
Trägerr. Dehnf. Satz 08.08.2002 14:13 Uhr Seite 9
Storebælt East Bridge,Denmark
TGV Viaduct,Avignon
Vasco da GamaBridge, Portugal
Bridge over theRiver Main,
Nantenbach
Yang Pu Bridge, China Oberbaum Bridge, Berlin
Maurer Söhne Head OfficeFrankfurter Ring 193, D-80807 MünchenP.O. Box 44 0145, 80750 München/GermanyPhone ++49/89/3 23 94-0Fax ++49/89/3 23 94-306e-mail [email protected] Internet www.maurer-soehne.de