Swivel Joist Expansion Joints
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Bridge Accessories MAURER Swivel-Joist Expansion Joint MAURER SOHNE

MAURER Swivel-Joist Expansion Joint The MAURER Swivel-Joist Expansion Joint is an enhancement of the Girder Grid Expansion Joint, considerably adding to the range of application of the MAURER Modular Expansion Joints. When large and complex movements are required then for geometrical and economic reasons the use of Swivel-Joist Joints are to be preferred rather than Girder Grid Joints. Also in the case of restricted space, for instance in steel bridges and with the replacement of old rolling leaf type joints, the application of the watertight Swivel Joint is advisable. The MAURER...

Design Principles and Main Components Technical approval and independent periodical inspection acc. to TL/TP-FÜ Designation Supporting Elements 1edge beam Continuous in-house and eld quality control, the use of high-grade materials, a quality assurance system in complying to DIN EN ISO 9001 as well as an environmental management system according to DIN EN ISO 14001 ensure the high standard of MAURER Swivel-Joist Expansion Joints. All design elements of MAURER Expansion Joints are engineered in high-quality materials. All synthetics employed feature excellent resistance to ageing, wear, and...

Functional Principles Type DS320 displacement of a support bar that is xed at one side view from below The centre beams of the Swivel-Joist Expansion Joint can slide on support bars with the help of sliding bearings. By means of the geometrical arrangement of the support bars the position of the centre beams is controlled such that the overall width of the joint opening is equally subdivided to the joint gaps between the centre beams and between the centre beams and edge beams respectively. This both simple and effective control mechanism means an important advantage of the Swivel- Joist...

MAURER Swivel-Joist Expansion Joints can absorb all movements customary in bridge construction. The versatile mechanism of this type makes it suitable for variable skew angles along axes centred on a xed point and also for complex hybrid movements and rotations about the spatial axes x, y and z. The recess sizes given in the following pages will give the planner of the bridge structure some assistance for designing. The distribution of a support bar movement to each joint edge can be settled as per requirement or liking, other solutions than those shown below can be designed as well. All...

Movement of support bars to one side only Recess dimensions cross section through support box at carriageway footway cross section – version 1 carriageway cross section at anchorage footway cross section – version 2 Presetting of gap dimension e = 30 mm MAURER exp. joint n structural dimensions concrete recess dimensions All dimensions are rectangular to the joint axis y. n = number of sealing elements a, f and l apply to a presetting dimension e = 30 mm for every joint gap and must be adjusted by n x ∆e in case of deviating presetting dimension e. recesses for footway joists, restraints...

Movement of support bars to both sides Recess dimensions cross section through support box at carriageway footway cross section - version 1 carriageway cross section at anchorage footway cross section - version 2 design data structures acc. to directives Tl/TP-FU you must also observe the details given recess dimensions n = number of sealing elements joint gap and must be adjusted recesses for footway joists, restraints and tube openings as a rule reguire prior consent Smaller recess dimensions are possible by special design of standard testing specifications

Steel connection Recess dimensions cross section through support box at carriageway 175 footway cross section – version 1 carriageway cross section at anchorage footway cross section – version 2 Presetting of gap dimension e = 30 mm MAURER exp. joint n structural dimensions concrete recess dimensions All dimensions are rectangular to the joint axis y. n = number of sealing elements a, f and l apply to a presetting dimension e = 30 mm for every joint gap and must be adjusted by n x ∆e in case of deviating presetting dimension e. recesses for footway joists, restraints and tube openings as a...

Control of Swivel-Joist Expansion Joints Type DS320 Control of the movement of support bars to one side On the one hand, rigid control mechanisms guarantee an exact allocation of the total movement to the individual gaps, and this mechanism also employs a clearly dened support system. But on the other hand such a rigid control is prone to strains that are caused by unplanned and unexpected movements, such as dimensional tolerances, difference in temperature in the respective members of the joint, and deviations from the designed movement. Any support system that neither accepts dimensional...

MAURER Seismic Expansion Joint DS320 with fuse box, Maximum opened operating position (s=80 mm) There is a demand for reliable and economic solutions to cope with seismic strains. For operating condition the MAURER-SeismicExpansion Joint is dimensioned like a Swivel Joist Expansion Joint, geometrically adapted to the seismic movements. By this, the number of sealing elements as well as the wearing parts and nally the price are minimized. All movements are transmitted without constraints or damages. Maximum opened seismic position (e.g.: s=150 mm) b.) Direction of movement The direction of...

University of Berkeley/ California Testing equipment The admissible gap width, which as a rule is 80 mm, can be exceeded during seismic action. The control elements, following the "theorem on intersecting lines", enable every opening condition of the expansion joint. By adapting the length of the support bars, opening conditions of whatever magnitude can be accommodated without strain. The sealing element will be adapted such as to follow the combined earthquake movements without the risk of unfolding. If for economic reasons the working range of the sealing element shall be limited, then...