Cavity assembly type tunnel inverted arch and construction method

Abstract

The invention provides a cavity assembly type tunnel inverted arch and a construction method, and relates to the field of tunnel construction. The cavity assembly type tunnel inverted arch comprises aplurality of inverted arch blocks sequentially laid on the bottom surface of a tunnel in the longitudinal direction of the tunnel, a channel longitudinally distributed in the tunnel is formed in thecenter of each inverted arch block, the channels are symmetrically distributed relative to the vertical symmetry plane of the tunnel, and the bottoms of the channels are planes; the tops of the channels are in arched shape; and the channels corresponding to the inverted arch blocks are in sequential butted joint and communication to allow staff to pass through. A channel structure allowing the staff to escape is arranged in the prefabricated inverted arch structure through a prefabricated assembly structure. After the inverted arch structure is continuously arrayed, a rescue channel communicating to a construction point from a safe area outside the tunnel during tunnel construction is formed, a traditional trestle cast-in-place inverted arch construction method is replaced, the construction efficiency is improved, and besides, the safety in the tunnel construction process is guaranteed.

Description

Technical field [0001] The present disclosure relates to the field of tunnel construction, in particular to an inverted cavity assembly tunnel and a construction method. Background technique [0002] The statements in this section merely provide background technology 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, the prefabricated buildings that are strongly advocated save energy resources, reduce construction pollution, improve labor production efficiency, and ensure quality and safety. It is widely used in housing construction, bridges, tunnels and other fields. [0004] The inventor found that the current traditional construction of tunnel inverts includes invert excavation, base cleaning, lashing of steel bars, installation of formwork, and concrete pouring. There are many construction proce...

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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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