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The Damage Causes Of Expansion Joint
Dec 02, 2016

1 poorly, bridge expansion joint design

Design bearing the Ministry failed to seriously consider, under repeated load, beam damage caused by expansion and contraction installation failure. In addition, sometimes inappropriate deformation calculation, using a large scale spacing, resulting in expansion joint damage.

2, expansion joint device itself problems

Expansion device in itself insufficient anchoring strength of structural rigidity, have varying degrees of damage in the process.

3, improper expansion device after pouring pressure filling material

Expansion device after pouring pressure filling material seriously, carefully selected, resulting in reduced quality of expansion device operation, have varying degrees of the disease.

4, the construction is not reasonable

In the course of construction, beam end joint distance was not completed as designed, artificially to zoom in and out, locate the angle position is not correct, resulting in expansion device is not working properly. You will get the following: because the stitch is too small, rubber expansion joints resulting from overrun extrusion protruding bump; because the stitch is too big, load the shear forces and the inertia of the vehicle will loose rubber expansion joints out of the position angle, resulting in another type of vehicle. Construction of welded steel fabric expansion joint anchor when strong enough, or omission of pre-embedded anchoring bars and joint itself risks; expansion device was not installed during construction, and after pouring of expansion joint of bridge deck pavement of bad process, resulting in broken joints under cyclic loading.

5, continuous joint is not perfect

In order to reduce the expansion joint, a large number of continuous beam or deck. Continuous slab-deck will be equipped with a continuous seam, joints in a row set is not perfect, leading to continuous joint damage, and bridge jumping. Continuous slab-deck joints, basting the width and depth of deformation is not standard, and is not unified, which also affect the continuous seam to work properly.