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

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...

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

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