Large-section pipe jacking river penetrating construction method applicable to shallow earthing condition
A construction method and a large-section technology, applied to artificial islands, water conservancy projects, underwater structures, etc., can solve the problems of increasing construction costs, difficulty in ensuring construction quality, and increasing difficulty in pipe jacking construction, so as to reduce project cost and benefit Reasonable force and simple structure
Inactive Publication Date: 2018-09-11
CHINA RAILWAY SHANGHAI ENGINEERING BUREAU GROUP CO LTD +1
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Problems solved by technology
These methods not only greatly increase the construction cost, but also the construction quality is difficult to guarantee, which increases the difficulty of pipe jacking construction
Method used
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[0042] The present invention will be further described below in conjunction with accompanying drawing, and the principle of this method is very clear to those skilled in the art. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0043] Such as figure 1 As shown, in the large-section pipe-jacking river-crossing construction method suitable for shallow-covered soil conditions designed by the present invention, the shallow-covered soil thickness is the minimum thickness from the top of the proposed pipe-jacking tunnel to the bottom of the river bed. Described construction method comprises the following steps:
[0044] 1. Construct one working well on the pipe jacking axis on both sides of the river to be crossed, one of which is the originating well and the other is the receiving well.
[0045] 2. If figure 2 As shown in Fig. 1, the temporary cofferdam of stage I is constr...
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The invention relates to the technical field of a non-excavation project method, in particular to a large-section pipe jacking river penetrating construction method applicable to the shallow earthingcondition. A work well is established on each of the two sides of a riverway planned to be penetrated, the work wells serve as a starting well and a receiving well correspondingly, and temporary cofferdams are sequentially arranged at the positions of the starting well and the receiving well correspondingly. Anti-floating plates are arranged in the temporary cofferdams, and after setting of the anti-floating plates is finished, the temporary cofferdams are dismounted, and the range of the temporary cofferdam arranged later is in lap joint with the range of the temporary cofferdam arranged earlier. Compared with the prior art, the large-section pipe jacking river penetrating construction method has the beneficial effects that the anti-floating plates and anti-floating piles are constructedalong the pipe jacking axis in the riverway planned to be penetrated through the cofferdams several times, the project safety is improved, the project cost is reduced as well, influences on normal pipe jacking construction are avoided, the riverway can be penetrated in the shallow buried depth where pipe jacking is hard to implement commonly, and great benefits are brought to the pipe jacking project.
Description
[technical field] [0001] The invention relates to the technical field of trenchless engineering methods, in particular to a large-section pipe jacking construction method for crossing rivers under the condition of shallow covering soil. [Background technique] [0002] At present, when the large-section pipe jacking project passes through the river, the minimum covering soil thickness H at the top is generally not less than 1.5 times the pipe diameter to meet the safety and anti-floating requirements. When the section of the pipe jacking tunnel is large, the construction environment has special restrictions, and the actual covering soil thickness cannot be satisfied, if the excavation cabin support pressure is not properly controlled during the pipe jacking construction, the front excavation surface will be unstable, and the riverbed will easily appear. The risk of water seepage at the pipe jacking head or pipe joints or even water and sand gushing in the working well is caus...
Claims
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Inventor项侨张全权刘习生陈伟平钱琨
OwnerCHINA RAILWAY SHANGHAI ENGINEERING BUREAU GROUP CO LTD