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Soil nailing wall foundation pit support and construction method

A technology of foundation pit support and construction method, which is applied in the fields of foundation structure engineering, excavation, foundation structure test, etc. Stability and water resistance, strength water impermeability, load reduction effect

Inactive Publication Date: 2011-07-20
ANHUI TONGJI CONSTR GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a soil nail wall foundation pit support and construction method to solve the problems that the soil nail wall cannot effectively retain water and the foundation pit support depth is not deep

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  • Soil nailing wall foundation pit support and construction method

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Embodiment Construction

[0037] A ten-story small high-rise building in an engineering department, with a construction area of ​​32,000m2 2 , the excavation depth of the foundation pit is 6.5 ~ 8m. The foundation adopts bored cast-in-place piles. The soil layer of the site is highly water-rich and belongs to the permeable layer. The vertical permeability coefficient is k. V 7.5×10 -6 cm / s, horizontal permeability coefficient k H 3.9×10 -6 cm / s.

[0038] The refrigeration equipment adopts YSLGF-300 refrigeration unit (102kw, maximum cooling capacity 86000kcal / h), 200S42A brine circulation pump (37kw, flow rate 198m) 3 / h, head 43m), IS125-100-250 cooling water circulating pump (22kW, flow 100m) 3 / h, head 20m), DBNL3-50 cooling tower (12kw), 6m 3 The brine tank and an appropriate amount of N46 refrigeration oil are made of R22 refrigerant, and calcium chloride solution is used as the refrigeration cycle brine, and the specific gravity of the brine is 1.260 to 1.265.

[0039] (1) Drilling the fre...

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Abstract

The invention discloses a soil nailing wall foundation pit support and a construction method. The construction method is characterized by comprising the steps of drilling freezing holes, arranging freezing pipes, arranging temperature tubes, performing the freezing construction, performing the pit excavation and ramp finishing, spraying concrete for the first time, performing the soil nailing construction comprising the processes of positioning, pore forming, reinforcement bar inserting and mortar pouring, processing a reinforcement net, spraying the concrete for the second time, maintaining the freezing; monitoring the foundation pit condition and pouring mortar. The invention is secure and reliable, and the stability and water sealing property of the foundation pit can be improved.

Description

technical field [0001] The invention relates to a soil nailing wall foundation pit support and construction method, which is suitable for the field of building construction. Background technique [0002] The main effect of the soil nail wall on the stability of the foundation pit is to change the properties of the soil through the replacement of the grouting soil nail. The shear strength and overall stiffness of the soil body are greatly improved. The soil nails in the "soil nail wall" complex are like steel grids, which have a skeleton function and form a complete whole with the soil body, sharing the soil like a retaining wall. The action of pressure and external load restricts the deformation of the foundation pit, thereby making the excavation pit stable. In the composite, the external load is mainly borne by the soil nail, and plays the role of stress transmission and uniform diffusion in the composite, so that the external load can be uniformly transmitted and diffuse...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/02E02D17/04E02D19/14E02D33/00
Inventor 朱奎
Owner ANHUI TONGJI CONSTR GRP