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Tunnel inverted arch foundation reinforcing assembly and construction method

A technology of foundation reinforcement and construction method, which is applied in the direction of foundation structure engineering, soil protection, construction, etc., can solve the problems of the tunnel support structure being closed and forming a loop late, occupying the initial support time of the inverted arch, and it is difficult to erect punching equipment and other problems. , to achieve the effect of ensuring the quality of foundation reinforcement, simple structure and reasonable design

Active Publication Date: 2020-09-18
CHINA RAILWAY DESIGN GRP CO LTD +1
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  • Abstract
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AI Technical Summary

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

Method used

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  • Tunnel inverted arch foundation reinforcing assembly and construction method
  • Tunnel inverted arch foundation reinforcing assembly and construction method
  • Tunnel inverted arch foundation reinforcing assembly and construction method

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Embodiment

[0046] A tunnel inverted arch foundation reinforcement component is characterized in that it includes: multi-section steel flower tubes 1 and steel covers 2, and multi-section steel flower tubes 1 are fixedly connected in sequence along the vertical direction, referring to figure 1 The upper end of the steel flower tube 1 is open and the lower end is closed. A plurality of grouting holes 11 are respectively provided on the wall of the steel flower tube 1. The diameter of the grouting holes 11 is 3 cm. The lower end of the steel flower tube 1 is provided with a bottom grouting hole 12. The diameter of the grouting hole 12 at the bottom is 5cm, and the length of the steel flower pipe 1 is not greater than the height from the top wall of the tunnel to the ground. In this embodiment, the length of the steel flower pipe 1 is 6m. A plurality of uniformly distributed fixing holes 14 are arranged on the outer wall of the steel flower tube 1 that is 1m from the top of the steel flower t...

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Abstract

The invention discloses a tunnel inverted arch foundation reinforcing assembly and a construction method. The reinforcing assembly comprises multiple steel flower tubes and a steel cover. The multiplesteel flower tubes are sequentially and fixedly connected in the vertical direction. Multiple grouting holes are formed in the tube walls of the multiple flower steel tubes. The steel cover is arranged at the top end of the topmost steel flower tube in the vertical direction. A first through hole and a second through hole are formed in the steel cover. The upper ends of the first through hole andthe second through hole are each provided with a detachable grouting steel tube and an exhaust grouting hose. The construction method comprises the steps of drilling, link-by-link connection, steel flower tube discharging in place, installing of steel caps, grouting tubes and exhaust tubes, grouting reinforcing, disassembling of grouting steel tubes, excavating inverted arching and supporting structure constructing. According to the reinforcing assembly and construction method for reinforcing a foundation before inverted arch excavation, the defect that a drill is placed at an arc inverted arch contour line due to the fact that drilling is performed after inverted arch excavation is avoided, drilling operation is greatly facilitated, and the drilling efficiency and the 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/00E02D3/12
CPCE02D3/00E02D3/12
Inventor 白鸿国苏伟侯军红李岩章慧健高树峰郑余朝曾青夏勇翁东郁吴强方伟冯天炜孙长升苏哿王成孙杰刘海达
Owner CHINA RAILWAY DESIGN GRP CO LTD
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