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Leakage prevention construction method of foundation pit support structure under blasting condition

A foundation pit enclosure and construction method technology, which is applied in the direction of foundation structure engineering, excavation, protection devices, etc., can solve the problems of inconspicuous sealing effect and secondary leakage

Active Publication Date: 2016-04-13
CHINA RAILWAY 16 BUREAU GRP BEIJING METRO ENG CONSTR +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Leakage prevention construction method of foundation pit support structure under blasting condition
  • Leakage prevention construction method of foundation pit support structure under blasting condition
  • Leakage prevention construction method of foundation pit support structure under blasting condition

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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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Abstract

The invention provides a leakage prevention construction method of a foundation pit support structure under a blasting condition. The leakage prevention construction method comprises the following steps: (1) a geological condition of a construction site is determined; (2) a soil covering body on a rock surface is excavated away; and the grouting treatment is performed for a generated wall crack; (3) a rock above the depth of a dig foundation pit is controlled to blast; (4) the crack is blocked by a method of combining injection of a double-component polyurethane high polymer material with high--pressure jet grouting pile formation; (5) blasting parameters are optimized; and (6) a next unit of blasting area is continuously blasted until the layer of blasting area finishes blasting; and after the layer of blasting construction is finished, the construction of a next layer of blasting area is performed. The leakage prevention construction method can effectively block the crack of the support structure to close an underground water leakage path on the outer side of the foundation pit, optimizes the blasting parameters step by step, and reduces the influence on safety of the support structure from blasting construction.

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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Application Information

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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
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