Supporting construction method for prefabricated foundation pit of railway bridge and culvert in limited space
A technology for foundation pit support and limited space, which is applied in basic structure engineering, excavation, sheet pile wall, etc. Effect
Pending Publication Date: 2021-08-03
CHINA RAILWAY SIXTH GROUP +1
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Problems solved by technology
[0003] The invention aims to solve the technical problem of difficult support of the existing railway bridge and culvert prefabricated foundation pit
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[0018] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.
[0019] refer to figure 1 , the limited space railway bridge and culvert prefabricated foundation pit support construction method of the present invention, comprises following construction steps successively:
[0020] 1) Measure and set out the line to determine the excavation position of the foundation pit; during specific construction, the excavation line can be marked on the existing concrete sleepers of each strand of the line;
[0021] 2) Use D beam 1 to reinforce the railway section above the bridge and culvert; this step is a mature operation in the field, specifica...
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The invention relates to a construction method, in particular to a supporting construction method for a prefabricated foundation pit of railway bridge and culvert in limited space. The supporting construction method for the prefabricated foundation pit of the railway bridge and culvert in the limited space aims to solve the technical problem that an existing prefabricated foundation pit of the railway bridge and culvert in the limited space is difficult to support. The supporting construction method for the prefabricated foundation pit of the railway bridge and culvert in the limited space comprises the following steps of (1) measuring and setting out; (2) reinforcing a railway section above the bridge and culvert by adopting a D beam; (3) excavating a first section of earthwork of a first layer, and carrying out soil nailing wall net hanging and shotcrete anchor construction on a side slope; (4) adopting high-pressure jet grouting piles for machining the side wall of the first section of earthwork of a second layer, vertically driving steel sheet piles into the side wall of the second layer of the earthwork for reinforcement before completely solidifying the side wall of the second layer of the earthwork, penetrating the steel sheet piles through the side wall of the second layer of the earthwork and inserting the steel sheet piles into soil below the side wall, and carrying out soil nailing wall net hanging and shotcrete anchor construction on the formed side wall; (5) repeating the step (3) and the step (4), and carrying section construction; and (6) excavating the second layer of the earthwork outwards from a tunnel face and from the middle to the two sides after the length of the foundation pit is reached, wherein the tunnel face is sloped according to the ratio of 1: 1, and carrying out soil nailing wall net hanging shotcrete anchor construction on the tunnel face to complete foundation pit supporting.
Description
technical field [0001] The invention relates to a construction method, in particular to a construction method for supporting a prefabricated foundation pit of a railway bridge and culvert in a limited space. Background technique [0002] With the improvement of people's living standards and the development of railway transportation, the available space on the ground is gradually decreasing, and the development and utilization of underground space has become the main battlefield of urban construction. More and more people are devoted to the research of underground engineering. During the excavation of prefabricated bridges and culverts under the existing railway, the internal space of the foundation pit is limited, and large equipment cannot enter, so the traditional protective pile + crown beam + steel support method cannot be used for foundation pit support. Contents of the invention [0003] The invention aims to solve the technical problem that the existing railway brid...
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IPC IPC(8): E02D17/04E02D15/02E02D5/76
CPCE02D5/76E02D15/02E02D17/04
Inventor 高新刚张志恒谢兴段英杰武泽帆
Owner CHINA RAILWAY SIXTH GROUP