A construction method of prefabricated steel-frp composite corrugated plate tunnel bottom support structure

Abstract

The invention discloses a construction method of a bottom supporting structure of a prefabricated steel-FRP composite corrugated plate tunnel. The whole bottom supporting structure is composed of FRPcomposite corrugated plates of embedded steel and steel grilles. The construction method comprises the steps that firstly, the FRP composite corrugated plates of the embedded steel are prefabricated,the FRP composite corrugated plates of the embedded steel and the steel grilles are assembled and connected on the site, and concrete is poured; the components and primary linings of the upper parts of the components are connected through flanges, and the components and secondary linings of the upper parts are connected through binding of reserved steel bars, the adjacent components are connectedthrough high-strength bolts in the longitudinal depth direction of the tunnel, and the concrete is poured between the components and lower surrounding rock. The supporting structure uses the FRP composite corrugated plates of the embedded steel as the first linings, while the steel grilles bound on the corrugated plates are used as formworks of the secondary linings. The construction method is quick in assembling speed and high in safety, once forming of the supporting structure is achieved, the material strength in high, modulus of elasticity is large, and the corrosion resistance is good.

Description

technical field [0001] The present invention is a method for prefabricating the bottom support structure of a permanent tunnel in the back field, which is installed and poured as a whole on site. Specifically, it is a prefabricated FRP composite corrugated plate embedded with steel, and a traditional steel grid. Apply primary lining and secondary lining at the bottom of the tunnel. Background technique [0002] In the process of tunnel construction, due to the uneven construction level of workers, the lack of awareness of the hazards of over- and under-excavation, and the lack of relevant theoretical knowledge, the phenomenon of insufficient excavation at the bottom of the tunnel often occurs, and it is difficult to distinguish the tunnel after pouring concrete. Whether the amount of excavation at the bottom reaches the standard has brought hidden dangers to the safety of the tunnel. The use of prefabricated support structures can obviate such hidden dangers by mandating th...

AI Technical Summary

Problems solved by technology

However, FRP has the disadvantages of high price, low elastic modulus, and brittle failure in the form of failure, which limits its application as the main load-carrying material.

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