Novel grouting pipe

Abstract

The invention discloses a novel grouting pipe which comprises an outer pipe body and a core pipe. A plurality of grouting holes are evenly formed in the different height positions from top to bottom along the outer pipe body. The core pipe is arranged inside the outer pipe body. Two layers of grouting stop pieces are arranged at the bottom of the core pipe. The grouting stop pieces are fixedly connected with the core pipe. A plurality of grout discharging holes are evenly formed in the core pipe and located between the two layers of the grouting stop pieces. The lower end of the outer pipe body is arranged to be of a big-end-up conical structure, and an outer pipe body lower end opening is formed in the bottom of the outer pipe body. At least three floating stop keys are evenly arranged on the inner wall, close to the lower end of the outer pipe body, of the outer pipe body. A spherical buoy is arranged between the floating stop keys and the lower end of the outer pipe body. By the adoption of the mode, the problems that when the multiple grouting holes are used for grouting, the lower grouting holes cannot achieve grouting easily, multiple grouting pipes are used in one cast-in-place pile, and therefore cost is high and working procedures are complicated can be solved.

Description

technical field [0001] The invention relates to the construction field, in particular to a novel grouting pipe. Background technique [0002] At present, in the construction of bored piles, the post-grouting construction technology at the pile end mainly has the following effects: [0003] 1. Reduce the impact of bored pile bottom sediment on pile end bearing capacity [0004] The construction of cast-in-situ piles softens the bearing layer at the bottom of the pile and reduces its strength. At the same time, due to the limitation of construction technology, it is difficult to remove and salvage the sediment at the bottom of the hole. The residual sediment at the bottom of the pile forms a weak compression layer, which greatly reduces the bearing capacity of the pile and increases the settlement. After the implementation of high-pressure grouting, the high-pressure grout produces various forms of combined effects such as filling, seepage and expansion, and compaction in th...

AI Technical Summary

Problems solved by technology

[0012] The technical problem mainly solved by the present invention is to provide a new type of grouting pipe, which can solve the problem that the lower grouting hole is difficult to grout when multiple grouting holes are used for grouting, and one grouting pile adopts multiple grouting pipes, which is expensive and complex process issues

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