Comprehensive support structure of irregular deep foundation pit groups approaching to high-speed railway and construction method
A technology for high-speed railways and supporting structures, which is used in infrastructure engineering, excavation, construction, etc. to ensure the progress of the project, ensure convenience, and overcome limitations.
Pending Publication Date: 2019-04-19
CHANGJIANG SURVEY PLANNING DESIGN & RES
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[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned single protection technology, and propose a comprehensive support structure and construction method for irregular deep foundation pit groups near high-speed railways. The present invention utilizes orderly excavation, enhanced support stiffness, pre-reinforced A series of comprehensive protection measures of isolation and bottom water stop effectively control the adverse impact on the high-speed railway during the construction of deep foundation pits
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[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0029] This embodiment discloses a comprehensive support structure for irregular deep foundation pit groups near high-speed railways. figure 1 As shown, the foundation pit group of the embodiment is composed of three foundation pits, the property foundation pit 2 on the north side, the subway station foundation pit 3 in the middle, and the property foundation pit 4 on the south side with irregular plane shapes, and the distance from the property foundation pit 4 on the north side is about 22.9 m is the high-speed railway 1, and the total excavation area of the foundation pit is 21,900 m 2 , the excavation depths of the above foundation pit groups are 14.4m, 26.5m and 15.9m respectively. Among them, the south side and the north side do not refer to the actual south side and the north side, but only indicate the two sides of the subway, not li...
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The invention discloses a comprehensive support structure of irregular deep foundation pit groups approaching to a high-speed railway and a construction method. The comprehensive support structure comprises an underground diaphragm wall, a three-axis mixing pile strengthening body and a large-circular concrete inter support. The construction method of the comprehensive support structure includes the steps: constructing a middle subway station foundation pit and the three-axis mixing pile strengthening body outside the high-speed railway; constructing a north property foundation pit bottoming underground diaphragm wall after construction of the three-axis mixing pile strengthening body is completed; constructing a south property foundation pit far away from the high-speed railway after a middle subway station body structure top plate is poured by concrete; constructing a north property foundation pit close to the high-speed railway after the last inner support of the south property foundation pit forms strength. According to the method, sequentially digging, support rigidity reinforcing, pre-reinforced isolation and bottoming water stop are comprehensively utilized, adverse effectson the high-speed railway during construction of deep foundation pit groups are effectively controlled, and running safety of the high-speed railway is ensured.
Description
technical field [0001] The invention belongs to the field of underground space development and utilization, and specifically relates to a comprehensive support structure and construction method for irregular deep foundation pit groups near high-speed railways. Background technique [0002] In recent years, with the increasing number of urban underground space development projects, foundation pit engineering has shown a trend of large-scale, irregular, and highly complex development. How to develop underground space safely, economically and efficiently in cities with dense buildings and structures has become an important issue. It has become one of the key research topics of various scientific research institutions and design units. In each stage of foundation pit engineering design, it is inevitably restricted by surrounding environmental factors, such as urban main roads, urban viaducts, railways and buildings, etc. The excavation of foundation pits will cause certain distu...
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IPC IPC(8): E02D17/04
CPCE02D17/04
Inventor 陈文峰张勋李彬高洪远刘东勾朝伟刘博刘广
Owner CHANGJIANG SURVEY PLANNING DESIGN & RES
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