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Foundation pit support construction method suitable for three-free-face building envelope

A technology of enclosure structure and construction method, which is applied in basic structure engineering, excavation, construction, etc., can solve problems such as safety accidents, steel support falling off, deformation, etc., and achieve the effect of high safety, good integrity, and improved safety.

Inactive Publication Date: 2017-04-26
CHINA RAILWAY DEV INVESTMENT CO LTD
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  • Claims
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Problems solved by technology

[0005] However, in densely built urban areas, the complex surrounding environment makes the excavation of foundation pits face various problems, among which the most prominent is that there is no surrounding rock in the area outside the protection piles surrounding the foundation pit, and it is in a state of being empty.
If the internal support system used in this case is steel support, and the steel support cannot be pulled, then the place with the free surface may be deformed in the direction of the foundation pit (back to the inner side of the foundation pit), thus Make the steel support fall off, causing a safety accident

Method used

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  • Foundation pit support construction method suitable for three-free-face building envelope
  • Foundation pit support construction method suitable for three-free-face building envelope

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Embodiment Construction

[0025] Please refer to the attached figure 1 And attached figure 2 Shown, the present invention is a kind of excavation support construction method suitable for three-face hollow enclosure structure, and it comprises following construction steps:

[0026] 1), construction of foundation pit protection pile 1 and crown beam 2, three sides of foundation pit protection pile 1 in the negative floor 3 of the underground are in the air state, that is, there is no rock mass or only very thin rock mass, such as figure 1 .

[0027] 2) Excavation of foundation pit earthwork, construction of waist beam 4 and concrete support 5, considering the existence of three free surfaces on the underground negative floor 3, all supports in the foundation pit are supported by reinforced concrete, which can be both compressed and tensioned , the support profile is shown in figure 2 .

[0028] 3), excavate to the bottom of the foundation pit, pour plain concrete cushion and bottom plate 6, such as...

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Abstract

The invention relates to a foundation pit support construction method suitable for a three-free-face building envelope. The construction method comprises the following construction steps: (1) constructing fender posts and top beams of a foundation pit, wherein three faces of the fender posts of the foundation pit are in a free state in an underground ground floor; (2) carrying out earth excavation of the foundation pit, and constructing breast beams and concrete supports, wherein the supports in the foundation pit are all made of reinforced concrete; and (3) excavating to the bottom of the foundation pit and pouring a concrete cushion and a concrete bottom plate. According to the invention, reinforced concrete supports are adopted, so that the stress form of the building envelope is changed, pressed and pulled characteristics of the reinforced concrete supports are fully expressed, the safety of a supporting structure of the foundation pit is improved, and the integrity of the supporting structure is better; and in addition, the supporting problem caused during the excavation process of the three-free-face deep foundation pit is better solved, so that the excavation construction is safer and more reasonable.

Description

[0001] 【Technical field】 [0002] The invention relates to a construction method for foundation pit support, in particular to a construction method for foundation pit support suitable for three-face hollow enclosure structures, and belongs to the technical field of construction engineering. [0003] 【Background technique】 [0004] As the pace of urbanization continues to move forward and the development of cities is getting faster and faster, the development of underground space will surely occupy an important position in urban construction. In deep foundation pit engineering, the periphery of the foundation pit is usually surrounded by surrounding rocks. The support system used is usually in the form of crown beam + reinforced concrete support for the first support, and steel supports for the subsequent supports. Compression without tension; or use anchor cables + baffles between piles for support. [0005] However, in densely built urban areas, the complex surrounding enviro...

Claims

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Application Information

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IPC IPC(8): E02D17/04
CPCE02D17/04
Inventor 鲁彬杨森易立刘攀温元平臧熙伟陈海勇李壮张蔚
Owner CHINA RAILWAY DEV INVESTMENT CO LTD
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