Anchoring construction method suitable for settlement and deformation of overlying soil in shallow tunnels
A technology for shallow buried tunnels and construction methods, applied in tunnels, earthwork drilling, tunnel lining, etc., can solve problems such as settlement and deformation of the overlying soil layer, and achieve the effects of delaying deformation, high construction efficiency, and low cost
Active Publication Date: 2019-09-27
XIAN UNIV OF TECH
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Problems solved by technology
[0004] The purpose of the present invention is to provide an anchoring construction method suitable for the settlement and deformation of the overlying soil layer of the shallow buried tunnel, which solves the problem that the existing shallow buried tunnel is prone to the settlement and deformation of the overlying soil layer during excavation
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[0038] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0039] The present invention is suitable for the anchor construction method for the settlement and deformation of the overlying soil layer of the shallow buried tunnel, comprising the following steps:
[0040] Step 1, Pretreatment before excavating the tunnel
[0041] On the excavation surface of the tunnel within the range to be reinforced, use ordinary drilling rigs to carry out hole-forming operations, such as figure 1 and figure 2 As shown, then the leading small catheter 1 is inserted into the formed hole and grouted to form a pre-consolidated layer;
[0042] The leading small conduit 1 is a seamless steel pipe, and specifically includes a grouting inlet, a grouting section steel pipe and a grouting section steel pipe that are connected to each other in sequence; Grouting holes; the inner diameter of the leading small duct 1 is 30-50mm...
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The invention discloses an anchor-pulling construction method suitable for sedimentation deformation of an overlaying soil layer of a shallow-buried tunnel. The anchor-pulling construction method comprises the following steps that 1, pretreatment before tunnel excavation is conducted; 2, a grouting anchoring rod is constructed on each of the left portion and the right portion of the spandrel position of the overlaying soil layer of the tunnel; 3, foundation beams are constructed nearby the ground surface above the tunnel to fix anchoring heads of the anchoring rods; and 4, the tunnel is excavated through an upper-middle-lower three-step method. According to the anchor-pulling construction method, the anchoring rods are constructed on the spandrel position of the tunnel and connected with the foundation beams, anchoring force is exerted to the overlaying soil layer of the tunnel, and thus anchor-pulling effect is achieved; effective strengthening is conducted for avoiding loosening, andthe very good limiting and reducing effects are achieved on sedimentation deformation of the overlaying soil layer of the stratum shallow-buried tunnel; and the construction method is short in construction period, low in manufacturing cost and high in construction efficiency, unbalanced force generated in tunnel excavation can be dissipated, the strain state is adjusted, development of deformation is slowed down, the self-constraining effect is achieved, and the very good practical value is achieved.
Description
technical field [0001] The invention belongs to the technical field of shallow-buried tunnel excavation methods, and in particular relates to a pulling anchor construction method suitable for settlement and deformation of an overlying soil layer of a shallow-buried tunnel. Background technique [0002] In recent years, the intensification of urban population has made the ground use area more and more limited, and the ground traffic has become more and more congested, thus promoting the rapid popularization and progress of urban underground railways. With the maturity of urban rail transit, both subway tunnels and highway tunnels have been well developed in various regions, but more and more problems have arisen. [0003] The rapid development of subways has undoubtedly alleviated considerable traffic congestion in major cities and brought great convenience to people. However, there is a concern here. The buried depth of the subway is generally 10-20 meters, and most of the ...
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IPC IPC(8): E21D9/00E21D11/10E21D11/18E21D11/38E21D20/00
Inventor 邵生俊朱丹丹
Owner XIAN UNIV OF TECH