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Construction method for sandstone layer long expansion body high-strength single-reinforcement anti-floating anchor rod

A technology of anti-floating anchor rod and construction method, which is applied in the direction of infrastructure engineering, sheet pile wall, protection device, etc. The effect of reducing the number of bolts, improving the pullout resistance and increasing the anti-floating effect

Pending Publication Date: 2019-03-26
GANSU SIXTH CONSTR GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In actual operation, ordinary anti-floating anchors are generally used to solve the problem. However, due to the low pull-out strength of ordinary anchors, and the number of steel bars and anchors is large, the disturbance to the base and the hidden dangers of waterproofing are also corresponding. increase, affecting the bearing capacity of the foundation and the function of the basement

Method used

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  • Construction method for sandstone layer long expansion body high-strength single-reinforcement anti-floating anchor rod
  • Construction method for sandstone layer long expansion body high-strength single-reinforcement anti-floating anchor rod

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Effect test

Embodiment 1

[0026] The construction method of the long-expanded high-strength single-reinforcement anti-floating bolt in the sandstone layer includes the following steps:

[0027] 1) Anchor hole forming: After the foundation pit is excavated to the designed cushion bottom elevation, the counter-floating anchor is positioned before the cushion construction, the anchor hole position is reserved, the cushion construction is carried out immediately, and the weathered sandstone layer is closed in time. After the concrete is hardened, the anti-floating anchor construction is carried out; during construction, the total length of the anchor is 12.0m, and the anchor is anchored into the raft 0.7m. According to the design requirements, during construction, the upper part uses the HM90 crawler drilling rig to form the hole, and the lower part uses the XL50B reaming drilling rig The hole is formed and entered into the sandstone layer, so that the diameter of the reaming part reaches 400mm, the steel c...

Embodiment 2

[0031] The construction method of the long-expanded high-strength single-reinforcement anti-floating bolt in the sandstone layer includes the following steps:

[0032] 1) Anchor hole forming: After the foundation pit is excavated to the designed cushion bottom elevation, the counter-floating anchor is positioned before the cushion construction, the anchor hole position is reserved, the cushion construction is carried out immediately, and the weathered sandstone layer is closed in time. After the concrete is hardened, the anti-floating anchor construction is carried out; during construction, the total length of the anchor is 12.0m, and the anchor is anchored into the raft 0.7m. According to the design requirements, during construction, the upper part uses the HM90 crawler drilling rig to form the hole, and the lower part uses the XL50B reaming drilling rig The hole is formed and entered into the sandstone layer, so that the diameter of the reaming part reaches 400mm, the steel c...

Embodiment 3

[0036] The construction method of the long-expanded high-strength single-reinforcement anti-floating bolt in the sandstone layer includes the following steps:

[0037] 1) Anchor hole forming: After the foundation pit is excavated to the designed cushion bottom elevation, the counter-floating anchor is positioned before the cushion construction, the anchor hole position is reserved, the cushion construction is carried out immediately, and the weathered sandstone layer is closed in time. After the concrete is hardened, the anti-floating anchor construction is carried out; during construction, the total length of the anchor is 12.0m, and the anchor is anchored into the raft 0.7m. According to the design requirements, during construction, the upper part uses the HM90 crawler drilling rig to form the hole, and the lower part uses the XL50B reaming drilling rig The hole is formed and entered into the sandstone layer, so that the diameter of the reaming part reaches 400mm, the steel c...

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Abstract

The invention discloses a construction method for a sandstone layer long expansion body high-strength single-reinforcement anti-floating anchor rod and belongs to the technical field of construction engineering. Construction of the sandstone layer long expansion body high-strength single-reinforcement anti-floating anchor rod is achieved through three steps of anchor rod pore forming, anchor rod installation and anti-floating anchor rod construction. According to the construction method, when the anti-floating anchor rod is utilized so that construction can be conducted, after a foundation pitis excavated to a designed mat layer bottom elevation, mat layer construction is conducted immediately, and a weathered sandstone layer is sealed in time; after the mat layer concrete hardens, anti-floating anchor rod construction is conducted; location of the anti-floating anchor rod is accurate, and construction is convenient; the problem that a highly-weathered sandstone layer is easy to soften due to meeting water and being exposed in the air is effectively controlled; and disturbance of the base in the construction process is avoided. After each component of the anti-floating anchor rodis subjected to solution treatment, extrusion treatment and phosphating liquid treatment, the corrosion resistance of the components ranges between 92.4% and 93.7%; and the service life of the anchorrod is prolonged.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and relates to a construction method for an anti-floating bolt, in particular to a construction method for a long-expanded high-strength single-reinforcement anti-floating bolt in a sandstone layer. Background technique [0002] Anti-floating anchor rod is a kind of anti-floating measures for underground structures in construction projects. The anti-floating anchor refers to the structural member set up to resist the upward displacement of the building on it, which is related to the level and change of the groundwater level, and is opposite to the force direction of the compression pile. At present, the anti-floating anchor construction in China is mainly carried out at the foundation bottom elevation. After the earthwork is excavated to the design elevation, the construction of the anti-floating anchor begins. The construction sequence is: first drill the hole, then hoist the ma...

Claims

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Application Information

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IPC IPC(8): E02D5/74E02D31/12
CPCE02D5/74E02D31/12
Inventor 阮立龙戴宏魏对林孙都成王政林
Owner GANSU SIXTH CONSTR GRP
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