A tunnel inverted arch foundation reinforcement component and construction method

Abstract

The invention discloses a tunnel inverted arch foundation reinforcement assembly and a construction method. The reinforcement assembly includes: multi-section steel flower pipes and steel covers, the multi-section steel flower pipes are fixedly connected in sequence along the vertical direction, and the pipe walls of the multi-section steel flower pipes are respectively There are multiple grouting holes, and the steel cover is arranged on the top of the steel flower tube located at the top in the vertical direction. The steel cover is provided with a first through hole and a second through hole, and the upper ends of the first through hole and the second through hole There are detachable grouting steel pipes and exhaust overflow hoses respectively. The construction method includes drilling, joint-by-section connection and lowering of steel flower pipes in place, installation of steel caps, grouting pipes and exhaust pipes, grouting reinforcement, removal of grouting steel pipes, excavation of inverted arches and construction of support structures. The invention provides a reinforcement component and a construction method for reinforcing the foundation before the excavation of the inverted arch, which avoids the disadvantage of placing the drilling machine on the contour line of the curved inverted arch caused by drilling after the excavation of the inverted arch, which is very convenient The drilling operation is improved, and the drilling efficiency and drilling quality are improved.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a tunnel inverted arch foundation reinforcement component and a construction method. Background technique [0002] In the construction of tunnel projects in weak ground, due to insufficient foundation bearing capacity or long-term effects, settlement may exceed the limit, so it is necessary to reinforce the inverted arch foundation. Existing reinforcement method is usually to first excavate the inverted arch to the base, and then measure and set out the drill holes to construct various pile foundations. Since the inverted arch is in an arc shape, when the inverted arch foundation is reinforced after the inverted arch is excavated, it is difficult to erect drilling equipment on the curved inverted arch ground, and the quality of the drilling is poor, and the drilling is used as a pile foundation. The operation takes up the time for the initial support of the inverted ...

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Problems solved by technology

Since the inverted arch is in an arc shape, when the inverted arch foundation is reinforced after the inverted arch is excavated, it is difficult to erect drilling equipment on the curved inverted arch ground, and the quality of the drilling is poor, and the drilling is used as a pile foundation. The operation takes up the initial support time of the inverted arch, which causes the tunnel support structure to be closed and looped late, causing safety hazards

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