Construction Method of Leakage Prevention and Control of Foundation Pit Surrounding Structure under Blasting Conditions
A technology of foundation pit enclosure and construction method, which is applied in the direction of foundation structure engineering, excavation, protection devices, etc., and can solve the problems of secondary leakage and unobvious sealing effect
Active Publication Date: 2017-08-11
CHINA RAILWAY 16 BUREAU GRP BEIJING METRO ENG CONSTR +2
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Problems solved by technology
[0004] Aiming at the defects in the prior art, the purpose of the present invention is to provide a construction method for preventing and controlling leakage of foundation pit enclosure structure under blasting conditions, which overcomes the inconspicuous sealing effect and easy The shortcomings and deficiencies such as secondary leakage occur, and the effective prevention and control of leakage of foundation pit enclosure structure under blasting conditions is realized
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Embodiment
[0081] A subway station is planned to be built in Huadu District, Guangzhou City, Guangdong Province. The total length of the outsourcing station is 259.7m. The buried depth is 15.81m; the construction pit is 98m long, 45m wide and 30m deep.
[0082] This embodiment provides a construction method for preventing leakage of foundation pit enclosure structure under blasting conditions. The specific construction steps of the construction method are as follows:
[0083] Step 1. Determine the geological conditions of the construction site;
[0084] According to the geological survey report, it is determined that the buried depth of the rock surface in the area to be constructed is 8-20m, and the distribution value of the unconfined compressive strength of the slightly weathered limestone layer is between 60-80MPa.
[0085] In this example, the soil layers from top to bottom are: upper artificial filling layer , alluvial silty sand , medium-coarse sand , gravel sand , plastic silty ...
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The invention provides a construction method for prevention and control of foundation pit enclosure structure leakage under blasting conditions, comprising: the first step, determining the geological conditions of the construction site; The cracks are grouted; the third step is to control the blasting to excavate the rock above the depth of the foundation pit; the fourth step is to seal the cracks by combining the injection of two-component polyurethane polymer materials and high-pressure rotary grouting piles; The fifth step is to optimize the blasting parameters; the sixth step is to continue the blasting of the next unit blasting area until the blasting of the blasting area of this layer is completed; after the blasting construction of this layer is completed, the construction of the next layer of blasting area is carried out. The invention can effectively seal the cracks of the enclosure structure, close the groundwater seepage path outside the foundation pit, gradually optimize the blasting parameters, and reduce the influence of blasting construction on the safety of the enclosure structure.
Description
technical field [0001] The invention relates to a construction technology in the field of underground engineering such as construction, water conservancy, transportation, environment, etc., and in particular relates to a construction method for preventing leakage of foundation pit enclosure structures under blasting conditions. Background technique [0002] Major cities across the country are developing and utilizing underground space on a large scale. These underground space structures need to be constructed through excavation of foundation pits. During excavation of foundation pits, enclosure structures such as underground diaphragm walls are usually used as soil and water retaining structures. Due to the different geological conditions and surrounding environments of each project, the method of foundation pit excavation and its impact on the enclosure structure are also different. The construction technology of foundation pit excavation has been widely used in soft soil ...
Claims
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IPC IPC(8): E02D17/04E02D31/02
Inventor 郭银波高宪民周阳宗李晓亮武铁路赵守宪朱小藻沈水龙范志高苏周勃肖瑞传刘锐孙国辉韩守初张宁吴怀娜
Owner CHINA RAILWAY 16 BUREAU GRP BEIJING METRO ENG CONSTR