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Soil nailing wall foundation pit support and construction method

A construction method and foundation pit support technology, which is applied in foundation structure engineering, excavation, foundation structure tests, etc., can solve the problems that soil nail walls cannot effectively retain water and the depth of foundation pit support is not deep, and achieve efficient and rapid Stability and water-tightness, strength impermeable, good sealing effect

Active Publication Date: 2010-01-27
ANHUI TONGJI CONSTR GRP
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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

Method used

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  • Soil nailing wall foundation pit support and construction method

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Embodiment Construction

[0037] A ten-story high-rise building in an engineering department with a building area of ​​32,000m 2 , The excavation depth of the foundation pit is 6.5-8m. The foundation adopts bored cast-in-situ piles, and the soil layer of the site is relatively rich in water, which is a permeable layer, and 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] 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 circulation pump (22kW, flow 100m 3 / h, head 20m), DBNL3-50 cooling tower (12kw), 6m 3 The brine tank and appropriate amount of N46 refrigerating machine oil are made of R22 refrigerant, and calcium chloride solution is used as the refrigerating cycle brine, and the specific gravity of the brine is 1.260-1.265.

[0039] (1) Drilling the freezing hole T...

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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 nail wall foundation pit support and a construction method, which is applicable to the field of building construction. Background technique [0002] The main effect of the soil nail wall on the stability of the foundation pit is that the grouting soil nails change the properties of the soil through the replacement, the interaction between the soil nails and the soil, and the soil nails themselves bear the tension, compression, bending, shearing and surface soil pressure, effectively The shear strength and overall stiffness of the soil can be greatly improved. The soil nails in the "soil nail wall" complex are like a steel grid frame, which has a skeleton effect, and forms a complete whole with the soil, and jointly bears the soil like a retaining wall. The pressure and external loads restrict the deformation of the foundation pit, thereby making the excavation of the foundation pit stable. In the composite body, the ext...

Claims

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Application Information

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