Product description and construction method of bridge seismic tie rods

The bridge's seismic bracing incorporates various seismic measures, including anti-fall chains, longitudinal tie rods, dampers, rubber gaskets, seismic blocks, and bearings. Dampers are installed at the bridge expansion joints and piers. Longitudinal blocks and tie rods are used instead of anti-fall beams in the design.

Tie-rod retaining walls are a new type of retaining structure formed using reinforced soil and anchor bolt technology. Tie rods are horizontally anchored to both sides of the retaining wall and prestressed. Their working mechanism is twofold: first, the tension of the tie rods balances the pressure of the backfill or the forces exerted on the retaining wall during construction by accidental loads such as earthquakes or vehicle impacts, maintaining the wall's equilibrium; simultaneously, when one side of the retaining wall tends to overturn or slide, the other side provides passive protection by halting construction through the tie rods; second, the prestressing of the tie rods applies a lateral pressure to the backfill, subjecting it to triaxial stress, significantly increasing its strength and contributing to overall stability and uniform settlement. Compared to gravity retaining walls, tie-rod retaining walls offer advantages such as lightweight structure, small size, good economic benefits, and excellent overall seismic performance, making them suitable for road shoulders and embankment sections with limited land area and high seismic fortification intensity.

Construction process flow: When constructing the seismic retaining wall, the masonry work and the roadbed filling should be carried out simultaneously. When the corrugated metal pipe is placed 50cm above the ground, compaction should be carried out first, followed by trenching, pipe laying, and backfilling. After the corrugated pipe is laid, the following procedures should be followed: anchoring, grouting, adding steel pads, tightening nuts, and sealing the anchor.