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Structure and method used for improving compressive strength of pressure type anchor cable cement grouting body

A technology of compressive strength and cement grouting, which is applied in basic structure engineering, construction, sheet pile walls, etc., and can solve problems such as small volume shrinkage, pressure-type anchor cable restrictions, and pressure-type anchor cable theory imperfections

Active Publication Date: 2018-06-01
WUHAN SURVEYING GEOTECHN RES INST OF MCC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, due to the imperfection of the theory of the pressure-type anchor cable, and the pressure-type anchor cable requires the pressure-bearing structure at the bottom of the anchor cable to have greater strength, less deformation and a special shape; the grouting material is required to have better fluidity, Small volume shrinkage and high compressive strength after solidification, so the popularization and application of pressure-type anchor cables are limited

Method used

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  • Structure and method used for improving compressive strength of pressure type anchor cable cement grouting body
  • Structure and method used for improving compressive strength of pressure type anchor cable cement grouting body
  • Structure and method used for improving compressive strength of pressure type anchor cable cement grouting body

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Embodiment

[0066] Embodiment: The present invention is specifically implemented for the reinforcement of a certain project foundation pit. The project overview: the site is located in Guandu District, Kunming City, and the planned total land area of ​​the proposed project is 52020.60m 2 The perimeter of the vertical excavation line of the foundation pit is about 849m. There are one-story basement section and two-story basement section. The excavation depth of the foundation pit is 3.6-7.7m. The supporting scheme adopted is: (1) grading + long auger bored pile + recyclable prestressed anchor cable scheme; (2) grading + grouting floral tube scheme.

[0067] The support plan (1) is adopted on the east side of the foundation pit. According to the geological survey report, the depth of the foundation pit is 7.7m, and the miscellaneous fill is deep, and the anchor cables will pass through the miscellaneous fill, peaty soil, clay, silt and other soil layers , and about 20 meters outside the mai...

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Abstract

The invention provides a structure and method used for improving compressive strength of a pressure type anchor cable cement grouting body. The structure and method are used for solving shortcomings in the prior art. According to the pressure type anchor cable cement grouting body, a spiral reinforcing frame is added in the position, within the range of 1 to 3 m above a pressure bearing plate, inthe cement grouting body, the thread pitch of the spiral reinforcing frame is 20 to 60 mm, the spiral reinforcing frame is composed of multiple longitudinal ribs and spiral ribs wound outside the longitudinal ribs, the bottom of the spiral reinforcing frame is fixed to the pressure bearing plate, grouting is carried out in an anchor cable hole through a primary grouting pipe and a secondary grouting pipe to form the grouting body, and the grouting body completely wraps the spiral reinforcing frame. According to the anchor cable structure, the compressive strength of the cement grouting body can be at least improved by one cement mark, and the aims that it is ensured that the grouting body within the range of 1 m to 3 m above the pressure bearing plate meets the design needs, and is not crushed, reliability of the grouting body is improved, the designed cement mark is reduced, and the engineering cost is reduced.

Description

technical field [0001] The invention relates to the field of foundation pit supporting anchor cables, in particular to a structure and method for improving the compressive strength of a pressure-type anchor cable cement grouting body. technical background [0002] Since 1890, when reinforced rock formation first appeared in the coal mine reinforcement project in North Wales, geotechnical anchoring technology has developed rapidly around the world, and has been widely used in mines, hydropower, construction, railway tunnel traffic, etc. engineering field. The prestressed anchor cables commonly used in engineering can actively provide greater support resistance to the soil, thereby effectively increasing the shear strength of the soil, forming a compressive stress zone in the soil in the anchorage area, and inhibiting the displacement of the soil, achieving The role of maintaining the overall stability of the anchorage area. [0003] As the core component of geotechnical anc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/74
CPCE02D5/74Y02A10/23
Inventor 胡建伟张宏松邓学灯张伟赵旭荣李青炜陈学龙
Owner WUHAN SURVEYING GEOTECHN RES INST OF MCC
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