Operation tunnel fabricated prefabricated tunnel bottom structure and construction method

Abstract

The invention relates to the technical field of highway tunnels, in particular to an operation tunnel fabricated prefabricated tunnel bottom structure and a construction method. The tunnel bottom structure is composed of a prefabricated UHPC fabricated tunnel bottom structure, a tunnel bottom drainage system, a cable trough and a road surface pavement layer; the prefabricated UHPC fabricated tunnel bottom structure is formed by splicing a plurality of fabricated prefabricated parts; the tunnel bottom drainage system is composed of a central drainage pipe of a middle prefabricated part in the prefabricated UHPC fabricated tunnel bottom structure, HDPE longitudinal double-wall corrugated pipes longitudinally arranged along arch feet on the two sides of an operation tunnel and HDPE transverse double-wall corrugated pipes transversely arranged at intervals; the road surface pavement layer is composed of a plain concrete leveling layer and an asphalt concrete paving layer which are arranged on the top face of the UHPC fabricated prefabricated tunnel bottom structure; and the cable trough is composed of a cast-in-place cable trough body and a prefabricated UHPC cable trough cover plate. The tunnel bottom structure is reasonable in structural design, simple and convenient to construct and good in using effect, can be mounted and spliced by high-strength bolts after being positioned on site, can greatly shorten the construction process of a newly-built structure, and ensures the construction quality.

Description

technical field [0001] The invention relates to the technical field of highway tunnels, in particular to an assembled prefabricated tunnel bottom structure and a construction method of an operational tunnel. Background technique [0002] With the increase of the mileage and operation time of highway tunnels in my country, the tunnel bottom structure cracking, floor heaving, deformation and other diseases gradually appear, which may endanger the safety of vehicles and pedestrians. At present, the dismantling and replacement of the tunnel bottom structure is the most thorough and effective method for the treatment of tunnel bottom diseases. After the tunnel bottom structure is dismantled, the method uses manual on-site binding of steel bars, installation of drainage systems, positioning and installation of formwork, and finally reconstruction of cast-in-place concrete. Tunnel bottom structure, restored pavement structure layer. However, this method has obvious disadvantages, ...

AI Technical Summary

Problems solved by technology

However, this method has obvious disadvantages, that is, the construction process is complex and the concrete strength takes a long time, resulting in a long construction period and affecting the restoration of the tunnel to traffic; and it needs to be closed to traffic construction or half-open to traffic construction, high risk of safe operation, and road traffic protection in operation. high pressure

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