Isolation and protection structure of profile steel anchoring system of suspension bridge

Abstract

The invention discloses an isolation and protection structure of a profile steel anchoring system of a suspension bridge, comprising isolation and protection structures of a front anchor surface, front and rear anchor rods, front and rear anchor rod connecting plate regions, a rear anchor rod and a rear anchor beam connecting plate region, wherein the outlet of the front anchor surface is coated with a layer of vulcanized rubber sealant along the periphery of the anchor rods; the isolation and protection structures of the front and rear anchor rods are as follows from inside to outside: a vulcanized rubber sealant coating, an expanded material packaging layer and a pressure-sensitive adhesive tape layer; and the isolation and protection structures of the front and rear anchor rod connecting plate regions are as follows from inside to outside: a vulcanized rubber sealant coating, a foam material filling layer and a steel plate. The isolation and protection structure disclosed by the invention can effectively isolate the overall anchor rods from anchor concrete to avoid concrete cracking and anchor damage caused by displacement of the stress of the anchor rods, thereby effectively preventing external water vapor from entering the anchor, improving the air tightness and stability of the profile steel anchoring system and prolonging the service life of the profile steel anchoring system.

Description

technical field [0001] The invention relates to a type steel anchorage system of a suspension bridge, in particular to an isolation protection structure of the type steel anchorage system of a suspension bridge, which belongs to the technical field of bridge long-life anticorrosion. Background technique [0002] The anchorage system of the main cable of the suspension bridge is composed of the rear anchor beam and the front and rear anchor rods. Such as figure 1 As shown, the rear anchor beam 1 is buried in the anchor body concrete, one end of the rear anchor rod 3 is bolted to the rear anchor beam 1, the other end is bolted to the front anchor rod 2, and the other end of the front anchor rod 2 extends out of the anchor body The front anchor surface 4 is connected with the main cable. Both the front and rear anchor rods and the front anchor rod and the rear anchor beam are bolted with high-strength bolts through connecting plates. [0003] Heat will be generated in the pr...

AI Technical Summary

Problems solved by technology

At present, the isolation and protection scheme using this PEF foam material is usually to adhere the PEF material to the surface of the anchor rod with special glue to play the role of isolation protection, but its void ratio is large, and water vapor will continue to penetrate into the foam material and the anchor. between rods, creating a corrosion hazard

In addition, PEF material has low compressive capacity, is easy to deform during use, and is easy to debond from steel under stress.

PEF is greatly deformed by temperature, and its aging resistance and oxidation resistance are poor. It will appear aging in a short time, and it will not achieve a good isolation protection effect.

Therefore, generally speaking, this isolation scheme cannot meet the long-term isolation and sealing requirements of the anchorage system from the perspective of technical reliability analysis.

[0006] Whether it is the anti-corrosion system of the anchor rod or the anti-rust and anti-slip system of the friction surface, there are certain pores, which seriously affect its service life, and cannot provide long-term effective protection for the anchoring system, and the PEF foam material can only play a simple role. Isolation function, can not play the role of sealing and waterproof

If the above materials are aged, brittle, cracked, etc., the external water vapor will use it as a medium channel to contact the anchor base, resulting in hidden dangers of corrosion of the anchor

In addition, during the operation of the suspension bridge, the vibration caused by the passing of vehicles and the thermal expansion and contraction of the steel structure itself may lead to micro-cracks or even partial failure of the anti-corrosion coating of the anchor bolts.

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