Tunnel structure

Abstract

The invention discloses a tunnel structure and belongs to the field of tunnels. The tunnel structure aims at improving the construction efficiency and improving the force performance of an inverted arch. The inverted arch of the tunnel structure is formed by splicing a plurality of inverted arch prefabricated blocks; an inverted arch backfilling layer is formed by splicing a plurality of backfilling prefabricated blocks, and the inverted arch backfilling layer is supported on the top face of the inverted arch; all backfilling longitudinal splicing seams of the inverted arch backfilling layer and all inverted arch longitudinal splicing seams of the inverted arch are staggered with one another. According to the tunnel structure, the prefabricated blocks are assembled, factory production is facilitated, mounting in a tunnel is convenient, and the mounting time is shortened; the inverted arch backfilling layer is supported on the top face of the inverted arch, and mounting and overhaulingare more convenient and rapider; all the backfilling longitudinal splicing seams and all the inverted arch longitudinal splicing seams are staggered with one another, stress concentration at the inverted arch longitudinal splicing seams is avoided, accordingly, the force performance of the inverted arch is improved, and the probability of the water emitting disease of a pavement is decreased; andthe inverted arch backfilling layer is a prefabricated part, the strength and the rigidity of the inverted arch backfilling layer are improved, pavement supporting performance is good, and accordingly, the pavement structure can be simplified.

Description

technical field [0001] The invention belongs to the field of tunnels, in particular to tunnel structures. Background technique [0002] The tunnel structure along its circumference includes arch walls at the top and inverted arches at the bottom. During the construction of the tunnel, the surrounding rock is excavated first, then the primary support is applied, then the inverted arch and the inverted arch are backfilled, and finally the secondary lining is applied. The traditional inverted arch generally adopts cast-in-place concrete. During the construction process, there will be problems such as insufficient excavation depth of the inverted arch, virtual slag in the base, insufficient thickness of the inverted arch, and insufficient strength of the inverted arch. As a result, lining cracks, water leakage, etc. Clearance encroachment, pavement cracking, uplift, wrong platform and cable trench slope and other diseases seriously affect the safety, comfort and normal operatio...

AI Technical Summary

Problems solved by technology

However, for highway tunnels, since the driving path of the vehicle on the road surface and the load of the vehicle cannot be determined, the degrees of rolling on the road surface are different. Since the backfill layer of the inverted arch of the existing tunnel adopts a stone structure, the rigidity of the backfill layer of the inverted arch Poor, in the area where the road surface is densely crushed by vehicles, the road surface will be sunken. When the vehicle enters this area, the pressure will be concentrated in this area and will be transmitted downward to the corresponding inverted arch prefabricated block, resulting in a single inverted arch prefabricated block. The phenomenon of block stress, which leads to the failure of the connection between the inverted arch prefabricated block and the adjacent inverted arch precast block, resulting in the deformation of the inverted arch

However, the backfilling of flakes often has problems such as voids under the road slab due to insufficient backfilling and poor quality of concrete pouring and maintenance, which aggravates the degree of road surface depression, thereby accelerating the failure of the connection between the inverted arch prefabricated blocks, resulting in tunnel lining. Cracks affect tunnel safety

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