Reducing overlap joint combined type orifice pipe grouting method

Abstract

The invention discloses a reducing overlap joint combined type orifice pipe grouting method, which comprises the following steps of: drilling to a contact surface of a land rock from the ground surface, and lowering an outer sleeve; then, performing low-pressure grouting on the contact surface of the land rock and a contact segment of a bed rock by adopting an orifice closing method or an in-tube blocking grouting method until the design requirements are achieved; then, replacing cement paste in a drill hole of the contact segment of the bed rock with dense cement paste, and throwing into a short inner pipe and sinking to the bottom so as to enable the short inner pipe to be firmly connected with the outer sleeve to obtain a reducing overlap joint combined type orifice pipe; and performing orifice-closing high-pressure grouting from top to bottom section by section by utilizing the reducing overlap joint combined type orifice pipe. The method disclosed by the invention has the characteristics that the grouting quality is reliable; construction is simple; and the pipe consumption is low. The reducing overlap joint combined type orifice pipe grouting method is comprehensively used already in curtain grouting in first-stage Taocha canal head works of the middle line of a south-to-north water transfer project, and is good in effect.

Description

technical field [0001] The invention relates to a bedrock grouting method in engineering construction, in particular to a variable-diameter lap joint combined orifice pipe grouting method. Background technique [0002] In the construction of water conservancy and hydropower projects, the bedrock grouting usually adopts the rapid construction and high-pressure orifice sealing grouting method, that is, the orifice pipe is used for high-pressure grouting, and the high-pressure grouting can ensure the grouting effect. Due to low work efficiency, low pressure and poor effect, the traditional blocking grouting method is only suitable for shallow hole grouting, and rarely used for deep hole grouting. [0003] However, when the orifice sealing grouting method is applied to bedrock grouting under a deep overburden layer or under a concrete cut-off wall, there are the following problems: [0004] 1. Bedrock grouting under deep overburden [0005] Lower the orifice pipe to the soil-r...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the defects in the prior art that when grouting the deep covering layer and the bedrock under the cut-off wall, it is necessary to repeat grouting and waiting many times, which is time-consuming, labor-intensive and material-consuming, and to provide a fast, convenient, efficient and economical variable Grouting method of diameter lap combined orifice pipe

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