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Shield arrival method in circular small-section tunnel

A receiving method and small-section technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as difficulty in ensuring construction safety, and achieve the effects of reducing the risk of landslides, shield receiving construction safety, and convenient construction operations.

Active Publication Date: 2018-11-30
CHINA RAILWAY 21ST BUREAU GRP TRACK TRAFFIC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this project, the stratum that the tunnel crosses is mainly sand and pebble stratum, the groundwater level is relatively high, the diameter of the shield cutter head is 6280mm, and the inner diameter of the lining section of the mining method circular tunnel is 6400mm. For the lower part of the foot, it is difficult to ensure construction safety simply by adopting conventional methods to receive construction

Method used

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  • Shield arrival method in circular small-section tunnel
  • Shield arrival method in circular small-section tunnel
  • Shield arrival method in circular small-section tunnel

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Embodiment 1

[0029] exist Figure 1~3 Among them, a method for receiving a shield in a circular small-section tunnel of the present invention comprises the following steps:

[0030] S1. Tunnel advance support: adopt the method of pre-grouting reinforcement with large pipe shed and self-propelled anchor rod; the large pipe shed 7 adopts P110 steel flower pipe with a diameter of 146mm and a wall thickness of 9mm, and the arch is cast within 120° , the circumferential center distance is 300mm, the extrapolation angle is 1-2°, the number of each cycle is 31, and the lap joint is 3 meters, the grouting of the large pipe shed 7 adopts the cement slurry with a water-cement ratio of 0.5-1.0 , the grouting pressure is 0.5-1.2MPa, the grouting sequence is from bottom to top, first on both sides and then on the center, symmetrical grouting, the grouting pressure gradually increases from small to small, the final grouting pressure, The grouting speed and the holding time of the final pressure. During...

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Abstract

The invention discloses a shield arrival method in a circular small-section tunnel. The shield arrival method includes the following steps of S1, tunnel forepoling, S2, primary lining, S3, radial archback grouting reinforcement in primary lining, S4, working face plugging and front soil reinforcement, S5, secondary tunnel lining, S6, forepoling for a shield tunneling section, S7, mortar backfilling, S8, guide platform mounting, S9, dewatering and S10, shield arrival. The shield arrival method has the advantages that mounting of rubber water-stop curtains is not needed, the method is simple and convenient, construction safety is realized and the like, and can be popularized and applied to the shield machine acceptation and construction field.

Description

technical field [0001] The invention belongs to the field of shield machine receiving construction, and in particular relates to a shield machine receiving construction method in a water-rich sand pebble circular tunnel of an urban subway. Background technique [0002] In urban subway shield construction, shield machine reception is generally adopted directly on the receiving bracket or arc-shaped guide platform. In urban shallow buried tunnels, the "CD" method or "CRD" method or double In the side wall method, a temporary middle partition is used in the support section or a temporary inverted arch is set in the middle of the section, and the temporary support must be cut off when the shield tunnel receives the construction. In this project, the stratum that the tunnel crosses is mainly sand and pebble stratum, the groundwater level is relatively high, the diameter of the shield cutter head is 6280mm, and the inner diameter of the lining section of the mining method circular...

Claims

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Application Information

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IPC IPC(8): E21D9/06E21D20/02E21D11/14E21D11/18E21D11/10
CPCE21D9/001E21D9/0607E21D11/105E21D11/107E21D11/14E21D11/18E21D20/02
Inventor 陈德国经莲
Owner CHINA RAILWAY 21ST BUREAU GRP TRACK TRAFFIC ENG