A construction method of circuitous guide pit for prevention and control of tunnel water inrush

A construction method and technology of inrush water, applied in tunnels, tunnel lining, drainage and other directions, can solve the problems of increasing investment cost, surrounding rock disturbance, prolonging construction period, etc., and achieve the effect of improving construction quality, improving structural strength, and avoiding construction interference.

Active Publication Date: 2022-03-01
CHINA RAILWAY 16TH BUREAU GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the current existing methods for preventing water inrush from the face of tunnels in karst water-rich strata can discharge the water in the fault to a large extent, it will greatly disturb the surrounding rock in the area, increase investment costs, and prolong the construction period. Therefore, it is urgently needed Improve

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  • A construction method of circuitous guide pit for prevention and control of tunnel water inrush
  • A construction method of circuitous guide pit for prevention and control of tunnel water inrush
  • A construction method of circuitous guide pit for prevention and control of tunnel water inrush

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Embodiment

[0041] see Figure 1-4 , this embodiment provides a construction method for preventing tunnel water inrush and roundabout guide pit. The roundabout guide pit adopts a trackless transport single lane V-level composite section, the reserved amount of deformation is 15cm, and I-shaped steel is used to strengthen the support. It is characterized in that: Also includes the following steps:

[0042] S1: Pre-construction treatment;

[0043] S2: excavation by step method;

[0044] S3: support construction;

[0045] S4: advance support;

[0046] S5: shotcrete;

[0047] S6: Construction of weep holes on the side wall of the roundabout pilot pit.

[0048] In the construction method of the circuitous diversion pit for preventing tunnel water inrush provided by this embodiment, in the step S1, the pre-construction treatment includes:

[0049] Strengthen the support of the main hole arch frame at the junction of the main hole and the roundabout pilot pit top, and add locking feet. The...

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Abstract

The invention discloses a construction method of a circuitous guide pit for preventing water inrush in a tunnel. The circuitous guide pit adopts a grade V compound section of a trackless transport single lane, the reserved amount of deformation is 15 cm, and I-shaped steel is used to strengthen the support. It also includes the following steps: Pre-construction treatment; step method excavation; support construction; advance support; shotcrete; construction of weep holes on the side wall of the circuitous pilot pit. The construction method of the circuitous guide pit for preventing water inrush in the tunnel of the present invention can improve the structural strength of the tunnel by strengthening the support of the arch frame corresponding to the main tunnel at the junction of the main tunnel and the top of the circuitous pilot pit, and can avoid construction by excavating through the step method. Interference and reduce construction risks. Through support construction, scattered water can be concentrated and drained to side ditch, improving the quality of sprayed concrete construction. Through the construction of drainage holes on the side wall of the pilot pit, the effect of drainage and pressure reduction can be quickly achieved, effectively reducing the construction cost. There is a risk of water gushing on the working surface.

Description

technical field [0001] The invention relates to the technical field of tunnel water inrush construction, in particular to a construction method for preventing tunnel water inrush and a circuitous guide pit. Background technique [0002] Longnan Tunnel is a controllable and difficult project on the whole line. The total length of the tunnel is 10.24km, the maximum buried depth is 580m, and the minimum buried depth is 16m. 4 working areas and 5 working faces organize construction. The geological lithology is mainly composed of granite and sandstone, and a total of 11 faults are crossed. Among them, the DK99+500~+620 section is the F8 regional large fault fracture zone, with a length of 120m and a water pressure of 0.5MPa in the cave body. There are dangerous rocks in the cave body There are many risks such as rockfall, mud gushing, rock burst, high ground temperature, karst, shallow burial, surrounding rock instability and landslides, etc. The maximum water inflow is 18,000 c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D11/00E21D11/10E21D20/00E21F16/02E21D11/14E21D11/38
CPCE21D9/00E21D11/003E21D11/105E21D20/003E21F16/02E21D11/14E21D11/38
Inventor 马栋王武现闫肃黄立新徐华轩冯义涛郭海峰
Owner CHINA RAILWAY 16TH BUREAU GRP CO LTD
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