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A Construction Method of Nine Pilot Pit on Double Side Wall of Tunnel

A construction method and double-side wall technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of difficult construction, many excavation sections, complex construction steps, etc., and achieve low construction cost and design Reasonable, simple method and steps

Active Publication Date: 2018-05-15
THE FOURTH ENG CO LTD OF CHINA RAILWAYNO 20 BUREAU GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using the double-side-wall pilot pit method for tunnel excavation, due to the fact that the excavation section is divided into blocks, the tunnel lining is correspondingly constructed in blocks, which is difficult to construct and the construction steps are complicated, and the construction quality is difficult to guarantee

Method used

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  • A Construction Method of Nine Pilot Pit on Double Side Wall of Tunnel
  • A Construction Method of Nine Pilot Pit on Double Side Wall of Tunnel
  • A Construction Method of Nine Pilot Pit on Double Side Wall of Tunnel

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Embodiment Construction

[0078] Such as figure 1 The shown construction method of nine pilot pits on the double side wall of the tunnel comprises the following steps:

[0079] Step 1. Preliminary excavation of the tunnel: Carry out preliminary excavation of the constructed tunnel from back to front along the longitudinal extension direction of the tunnel, and obtain a preliminary excavation body after excavation;

[0080] to combine figure 2 and Figure 9 , the tunnel hole 9-1 of the constructed tunnel includes a left side wall pilot hole, a right side wall pilot hole, an upper core soil area pilot hole and a lower step excavation pilot hole 9 directly below the upper core soil area pilot hole, The pilot tunnels on the left side wall and the pilot tunnels on the right side wall are arranged symmetrically, and the pilot tunnels in the upper core soil area and the excavation tunnels 9 of the lower steps are located at the pilot tunnels on the left side wall and the right side wall pilot tunnels. Betwe...

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Abstract

The invention discloses a double-side-wall nine-portion heading construction method for a tunnel. The double-side-wall nine-portion heading construction method comprises the following steps of first, primary excavation of the tunnel, second, primary support constructing and temporary supporting system installing, third, skewback lining constructing and skewback section inverted arch backfilling, fourth, temporary supporting system dismantling and arc wall lining constructing, fifth, subsequent excavation of the tunnel, sixth, tunnel bottom inverted arc lining constructing and seventh, tunnel bottom inverted arc lining backfilling, wherein, in the primary excavation of the tunnel, the constructed tunnel is primarily excavated from back to front in the longitudinal extending direction of the tunnel, and an primary excavated cave is completely excavated; and in the primary support constructing and temporary supporting system installing, the primary excavated cave is subjected to primary supporting constructing from back to front, a tunnel primary supporting structure is formed through construction, and a temporary supporting system is erected on the inner side of the tunnel primary supporting structure completed through construction from back to front. The double-side-wall nine-portion heading construction method for tunnel is simple in method and step, reasonable in design, easy to construct and good in using effect, the construction process of the double-side-wall nine-portion heading construction method for the tunnel can be completed easily and quickly, and the construction process is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a construction method of nine pilot pits on double side walls of a tunnel. Background technique [0002] The double-side-wall pilot-pit method is a method of tunnel excavation, also known as the double-side-wall pilot-pit method or the glasses construction method, which belongs to a branch of the New Austrian Method and is based on the basic principles of the New Austrian Method. When tunnel excavation is carried out with the double-side-wall pilot pit method, the excavation surface division form adopted is generally to divide the tunnel excavation section into four parts, namely, the left-side pilot pit (also called the left-wall pilot tunnel), Right side wall pilot pit (also known as right side wall pilot tunnel), upper core soil area pilot pit (also known as upper core soil area pilot tunnel) and lower bench excavation pilot pit (also known as lower ben...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D9/14E21D11/10E21D11/12E21D19/00
CPCE21D9/00E21D9/14E21D11/10E21D11/102E21D11/12E21D19/00
Inventor 周玉兵胡立正徐磊岳阳
Owner THE FOURTH ENG CO LTD OF CHINA RAILWAYNO 20 BUREAU GRP
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