SDM Modular Bridge Joint

Modular Bridge Joint System (MBJS) is designed to accommodate both movement and rotation between adjacent bridge elements. In addition to supporting wheel loads, a properly designed modular joint will prevent water and debris from draining onto the underlying substructure.

SDM Modular Bridge Joint have transverse centerbeams which are rigidly connected to longitudinal support bars. Each support bar supports only one assigned centerbeam. The support bars span across the joint opening and slide between upper compressive springs and lower sliding bearings in support boxes to accommodate the thermal expansion and contraction of the bridge superstructure. Control springs are arranged between adjacent support bar (or support box) by steel stops to act as equidistance devices. The support boxes are cast into concrete on both sides of the joint. For SDM joint system, a support box will hold support bars as many as centerbeams.

The impact load and torque from wheel rolling at x, y and z direction are transmitted through the edgebeams, centerbeams, support bars and control springs and bearings.

The EPDM rubber sealing element, at a full vulcanized length, is installed into the claws in edgebeams/centerbams, to prevent passage of water or debris.