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Prestressed anchor foundation pit support and construction method

A construction method and foundation pit support technology, which is applied in foundation structure engineering, excavation, foundation structure test, etc., can solve problems such as poor safety of foundation pit support with prestressed anchor bolts, and improve construction conditions and consistency Great effect of ensuring safety

Inactive Publication Date: 2010-01-27
朱奎
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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 prestressed bolt foundation pit support and construction method to solve the problem of poor safety of traditional prestressed bolt foundation pit support

Method used

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  • Prestressed anchor foundation pit support and construction method
  • Prestressed anchor foundation pit support and construction method
  • Prestressed anchor foundation pit support and construction method

Examples

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Embodiment Construction

[0036] Describe in detail below in conjunction with accompanying drawing.

[0037] A building with a height of 34m and a total construction area of ​​35880m 2 , using a frame shear wall structure, the excavation depth of the foundation pit of this project is 6.40m, and the excavation area of ​​the foundation pit is about 3900m 2 , the foundation pit support adopts the prestressed bolt support method.

[0038] The prestressed anchor rod forms holes obliquely in the soil layer, relying on the friction between the anchor body and the soil, the gripping force of the tie rod and the anchor body, and the strength of the anchor rod to bear part of the force acting on the support structure. load. The prestressed anchor rod changes the stress state of the foundation pit, reduces the displacement of the foundation pit wall, and maintains the stability of the structure. The prestressed anchor bolt construction adopts fast-setting, early-strength cement volume anchoring agent poured in...

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Abstract

The invention discloses a prestressed anchor foundation pit support and a construction method. The prestressed anchor foundation pit support is characterized in that inner anchoring section pouring quick setting and early-strength cement cartridge anchor agent are adopted during the construction of a prestressed anchor, early-strength cement is used for a gird, economic cement mortar is poured in a tensioning section, and anchor tensioning is achieved in such as way that a screw cap is screwed down with a torque wrench to be clocked. The construction method comprises the steps of anchor hole positioning, hole drilling, hole clearance, anchor fabrication, anchoring agent pouring into anchor hole, anchor installation, gird pouring, anchor tensioning, tensioning section pouring and construction monitoring. The invention has small space for the construction and operation, and is suitable for all topographic forms and sites. The inner support is replaced bythe anchor, thus the construction cost can be reduced, and the construction condition can be improved.

Description

technical field [0001] The invention relates to the construction field, in particular to a prestressed bolt foundation pit support and a construction method. Background technique [0002] The prestressed anchor as foundation pit support uses the shear strength of the ground soil around the anchor to transmit the tensile force of the structure or maintain the stability of the excavation surface of the ground. Due to the use of the anchor, the anchored ground produces a compressive stress zone and It plays a reinforcing role in strengthening the stratum; in addition, the prestressed anchor rod and the soil layer form a complex that works together, which can effectively bear the tension and shear force, thereby improving the mechanical properties of the stratum. The prestressed anchor rod is composed of an anchor head, a free section and an anchor section. The anchor head is a component used to lock the tension of the anchor rod, and is composed of an anchor, a supporting plate...

Claims

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Application Information

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IPC IPC(8): E02D17/04E02D5/74E02D33/00
Inventor 朱奎
Owner 朱奎
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