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Self-drilling type spiral anchor rod and construction process using self-drilling type spiral anchor rod for grouting along with drilling, stirring and curing

A construction technique and screw anchor technology, which is applied in the installation of bolts, earthwork drilling, foundation structure engineering, etc., can solve the problems of insufficient tensile force and poor grouting effect of bolts, etc., and achieve good grouting effect and ensure The surrounding environment is safe and the effect of ensuring the quality of grouting

Inactive Publication Date: 2012-07-18
中石化胜利建设工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problems of poor anchor grouting effect and insufficient tensile force in foundation pit support engineering in soft soil areas

Method used

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  • Self-drilling type spiral anchor rod and construction process using self-drilling type spiral anchor rod for grouting along with drilling, stirring and curing
  • Self-drilling type spiral anchor rod and construction process using self-drilling type spiral anchor rod for grouting along with drilling, stirring and curing

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Embodiment Construction

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings. Referring to the accompanying drawings, a self-drilling screw anchor includes an anchor rod body 3, which is provided with a grout hole 2, and the front end of the anchor rod body 3 is closed. The blade 1 is welded on the front end of the anchor rod body 3 , and the stirring piece 4 is welded on the anchor rod body 3 behind the helical blade 1 . In one embodiment, the slurry outlet hole 2 is set on the anchor rod body 3 on the rear side of the helical blade 1, and its hole diameter is 4mm-8mm, such as 5mm, 7mm, 8mm and so on. When the grout hole 2 is directly arranged on the anchor rod body 3, its aperture will be smaller, which can increase its spraying capacity and prevent the soil body from blocking the grout hole 2. The slurry outlet hole 2 of another embodiment is a slurry outlet pipe welded on the anchor rod body 3, and is arranged on the rear side of the...

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Abstract

The invention discloses a self-drilling type spiral anchor rod and a construction process using the self-drilling type spiral anchor rod for grouting along with drilling, stirring and curing, which are suitable for support engineering of anchor-pulling slopes in weak soil regions. A paste outlet is arranged on a rod body of the spiral anchor rod, the front end of the rod body of the anchor rod is enclosed, a spiral vane is welded at the front end of the rod body of the anchor rod, and a stirring slice is welded behind the spiral vane on the rod body of the anchor rod. The construction process using the self-drilling type spiral anchor rod for grouting along with drilling, stirring and curing comprises the following steps of: injecting cement paste while drilling by rod body of the anchor rod, so that a paste body of the cement paste is ejected out of the paste outlet of the rod body of the anchor rod, mixing the paste body and a soil body cut by using the spiral vane on the front end, uniformly stirring the soil body and the cement paste by using the stirring slice arranged behind the spiral vane, forming an irregular anchor body after curing so that the anchoring force of the anchor rod is increased. Because the drilling and the grouting are integrated, the pressure influence of subsequent grouting on the side wall of a foundation pit is avoided; and meanwhile, the grouting pressure can be effectively controlled so that the grouting quality can be ensured.

Description

technical field [0001] The invention relates to construction equipment and a construction method for foundation pit support engineering in building construction, in particular to a self-drilling screw bolt and its construction technology of grouting, stirring and curing while drilling, which is suitable for the support of anchor-drawn slopes in soft soil areas Engineering, especially suitable for foundation pit support engineering of foundation construction in soft soil areas like the Yellow River Delta. Background technique [0002] The Yellow River Delta area is an alluvial plain composed of cohesive soil, silt and silt sand recently deposited in the Quaternary, and the buried depth of groundwater is relatively shallow, generally not exceeding 1m. [0003] For soft soil areas with rich groundwater, in order to keep the environment outside the foundation pit unaffected, precipitation outside the pit is generally not allowed. In the case that the dewatering outside the pit ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/74E02D17/20E21D21/00
Inventor 于华刘文清潘景龙郭斌辛圳杨月刚王颖娟史青芬张军夏清策
Owner 中石化胜利建设工程有限公司
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