A cavity-assembled tunnel inverted arch and its construction method

Abstract

The disclosure provides a cavity-assembled tunnel invert and a construction method, which relate to the field of tunnel construction and include a plurality of invert blocks for laying on the bottom of the tunnel sequentially along the longitudinal direction of the tunnel. The channels distributed longitudinally in the tunnel are distributed symmetrically with respect to the vertical symmetrical plane of the tunnel. The bottom of the channel is flat, and the top is arched away from the bottom surface. The prefabricated assembly structure arranges the passage structure for personnel to escape inside the prefabricated inverted arch structure. After the inverted arch structure is arranged continuously, a rescue passage connecting the safe area outside the tunnel to the construction point is formed during the tunnel construction, replacing the traditional trestle bridge. The construction method of pouring inverted arches not only improves the construction efficiency, but also ensures the safety during the tunnel construction.

Description

technical field [0001] The present disclosure relates to the field of tunnel construction, in particular to a cavity-assembled tunnel inverted arch and a construction method. Background technique [0002] The statements in this section merely provide background related to the present disclosure and do not necessarily constitute prior art. [0003] With the development of urbanization, the construction of transportation infrastructure mainly involves changes in construction methods. Among them, prefabricated buildings, which are strongly advocated, have the advantages of saving energy resources, reducing construction pollution, improving labor productivity and ensuring quality and safety. It is widely used in housing construction, bridges, tunnels and other fields. [0004] The inventor finds that the traditional construction of the tunnel inverted arch at present includes the processes such as excavation of the inverted arch, base cleaning, binding steel bars, installation ...

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Problems solved by technology

[0004] The inventors found that the current traditional construction of tunnel inverts includes processes such as excavation of inverts, basement cleaning, tying of steel bars, installation of formwork, and pouring of curing concrete. There are many construction procedures, which are greatly affected by climate conditions, and the cost of labor and machinery is high. And the shortcomings such as difficulty in guaranteeing the construction quality lead to defects such as tunnel bottom deformation, mud turning and initial branch cracking in the later operation of the tunnel, and its engineering adaptability is weaker than that of the prefabricated inverted arch

Second, during tunnel excavation and initial support construction, unfavorable geological conditions are often accompanied by accidents such as cave entrance collapse, vault collapse, and tunnel face collapse, which trap construction workers in the cave; after the accident, the traditional escape method Pre-set ultra-high polymer escape pipes and steel escape pipes are used. The placement of these pipes is limited to the upper space of the inverted arch. However, when the traditional rescue passage is blocked, it will lead to slow rescue speed, increased casualties and serious engineering problems. It is difficult to meet the needs of rapid rescue due to damage and other consequences; thirdly, by setting up necessary horizontal pre-buried pipelines, the inverted arch cavity can be used as a place for laying traffic monitoring, operation ventilation, lighting and other facilities during the operation period

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