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

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...

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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

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