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Shallow buried soil shield construction method

A construction method and technology of shallow soil covering, which are applied in earth-moving drilling, wellbore lining, tunnel lining, etc., can solve problems such as affecting the quality of the formed tunnel, the collapse of the face, and the leakage of water and slurry in the joints of the segments.

Inactive Publication Date: 2019-12-13
CHINA RAILWAY TUNNEL GROUP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the construction, the posture of the shield is difficult to control, and the joints of the segments leak water and grout, which affects the quality of the formed tunnel. In severe cases, the tunnel face collapses

Method used

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  • Shallow buried soil shield construction method
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  • Shallow buried soil shield construction method

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0043] A construction method for shield tunneling with shallow covering soil, comprising the following steps:

[0044] 1) Construction of the launch shaft: The launch shaft of the shield machine is constructed by the open cut and reverse method. The foundation pit enclosure structure 1 of the launch shaft adopts a 1200mm thick ground connecting wall, and six inclined concrete supports are vertically arranged, and a temporary neutral column is set in the middle. The central column adopts a 460mm×460mm lattice column; a Φ1200mm bored pile is arranged under the temporary central column;

[0045] 2) Reinforcement and precipitation of the initial section: the reinforcement of the initial section includes the reinforcement of the end of the initial section and the reinforcement of the ground; and the construction of the dewatering well after the reinforcement...

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Abstract

The invention discloses a shallow buried soil shield construction method. The construction method successively includes the following steps that starting well construction is conducted; starting section reinforcement and dewatering are conducted; the starting section reinforcement includes starting section end head reinforcement and stratum reinforcement; after the starting section reinforcement,a dewatering well is constructed to make shield dewatering to the bottom of a tunnel in advance before starting and reaching; starting platform construction is conducted; shield assembly and commissioning are conducted; a reaction frame and a supporting structure are installed; a hole door sealing device is installed; the sealing device includes first sealing fixed on an embedded ring frame at a hole opening position and second sealing fixedly connected with the first sealing through a sealing ring pipe; the middle position of a sealing ring is provided with a grease filling hole; hole door chiseling is conducted; a negative ring segment is installed, and a shield is jacked to the contact face of a cutter head; pressure balance is constructed in a muddy water bin; and shield circulation tunneling is conducted. The shallow buried soil shield construction method solves the problem that shield posture control is difficult in the shallow buried soil construction process, excavation face collapse is avoided, construction safety is improved, and the tunneling speed is accelerated.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a shallow-covered soil shield construction method. Background technique [0002] The difficulty of shield tunneling in soft soil shallow buried section is to control the posture of the shield. During the construction process, it is easy to appear "floating", "slurry", and the loss of the front soil of the excavation surface due to the fluctuation of the cutting pressure, resulting in the collapse of the excavation surface. [0003] The shield excavates in shallow covered silt and silty soft soil, and the silt and silty soft soil has a large void ratio, high sensitivity and thin covering layer. During the construction, the posture of the shield is difficult to control, and the joints of the segments leak water and grout, which affects the quality of the formed tunnel. In severe cases, the tunnel face collapses. Contents of the invention [0004] In view of this, the...

Claims

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Application Information

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IPC IPC(8): E21D9/06E21D9/14E21D11/38E21D9/00E21F16/02
CPCE21D9/001E21D9/06E21D9/14E21D11/38E21F16/02
Inventor 李凤远陈桥王发民孙振川陈瑞祥李宏波杨延栋张合沛秦银平许华国
Owner CHINA RAILWAY TUNNEL GROUP CO LTD
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