Annular post-grouting device for lower pile tips under sandstone geological conditions

Abstract

The invention relates to an annular post-grouting device for lower pile tips under sandstone geological conditions. The annular post-grouting device comprises a grouting device and grout. The annular post-grouting device is characterized in that the grouting device is an annular galvanized iron pipe, the outer diameter of the annular galvanized iron pipe is slightly smaller than the inner diameter of cast-in-place pile reinforcement cage, six groups of grouting holes which are annularly uniformly distributed are formed in the annular galvanized iron pipe, opening directions of four groups of grouting holes face the outside of a circle, opening directions of two groups of symmetrical grouting holes face the inside of the circle, and the grouting holes in each group are uniformly distributed on the annular galvanized iron pipe to form a quincunx. The annular post-grouting device has the advantages that the problem that a conventional grouting device cannot be inserted into hard strata under sandstone geological conditions can be solved, the grout can be uniformly distributed at the pile tips, effects of grouting partial pile sides and uniformly distributing the grout on the partial pile sides can be realized, the post-grouting construction efficiency for the pile tips under the red sandstone geological conditions can be improved, and the post-grouting quality and a post-grouting success rate can be guaranteed; the annular post-grouting device for the lower pile tips under the sandstone geological conditions can effectively adapt to the sandstone geological conditions, is simple in structure and brings convenience for construction.

Description

technical field [0001] The invention relates to a grouting device for building construction, in particular to an annular grouting device used for post grouting of pile ends under sandstone geological conditions. Background technique [0002] A certain project in Lanzhou is a landmark building in Lanzhou and even the entire northwest region. The main building is 250m high, making it the tallest building in the northwest region. The project is located in the bustling area of ​​the city center, adjacent to the city's main road and many residential buildings, and there are many municipal pipelines under the road, so the surrounding environmental protection requirements are relatively high. The area of ​​the foundation pit in the first phase of the project is about 20,100m2, the extension of the surrounding area of ​​the foundation pit is 558m, there are four underground floors, and the deepest excavation depth is 23.6m, which is the deepest foundation pit in the Northwest China....

AI Technical Summary

Problems solved by technology

[0005] The present invention is to provide a post-grouting annular grouter for pile ends under sandstone geological conditions, which is used to solve the problem that conventional grouters cannot be inserted due to hard strata under sandstone geological conditions, and can make the distribution of pile end grouting more uniform. And it can play the role of partial pile side grouting and uniform distribution, improve the post-grouting construction efficiency of pile ends under the geological conditions of red sandstone, and ensure the quality success rate of post-grouting

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