Prestressed ejection type pile side grouting valve and grouting method thereof

Abstract

The invention provides a prestressed ejection type pile side grouting valve. The prestressed ejection type pile side grouting valve comprises a grouting valve outer barrel and a grouting valve inner barrel, wherein the grouting valve outer barrel and the grouting valve inner barrel extend and retract in a sliding mode; a sealing water sealing rubber ring is arranged between the grouting valve outer barrel and the grouting valve inner barrel, a grout overflowing hole is formed in the bottom of one end, which faces outwards, of the grouting valve inner barrel, and a waterproof rubber film wrapsthe grout overflowing hole; a spring is arranged between the grouting valve outer barrel and the grouting valve inner barrel; and a rope is connected to the grouting valve inner barrel. A reinforced PVC hose and the prestressed ejection type pile side grouting valve are fixedly clung to the outer ring of a reinforcing cage and sink in a pile hole together with the reinforcing cage; the prestressedejection type pile side grouting valve is pressed, after the reinforcing cage sinks in place, the rope is pulled, and the grouting valve inner barrel is ejected and clung to the wall of the pile hole; and after the strength of a pile body is stabilized, grout is injected, the waterproof rubber film is breached, and the grout flows out from the grout overflowing hole to be injected into pile rocksoil. The prestressed ejection type pile side grouting valve has the advantages of the simple structure and convenience in construction, and the grouting operation has no influence on the strength andintegrity of concrete of the pile body.

Description

technical field [0001] The invention belongs to the technical field of cast-in-situ piles in construction engineering, and in particular relates to a prestressed ejection type pile side grouting valve and a grouting method thereof. Background technique [0002] Post-grouting of cast-in-situ piles is an auxiliary construction method of cast-in-situ piles. This technology aims to solidify the mud skin by grouting on the side of the pile and reinforce the soil in a certain range around the pile, so as to greatly increase the bearing capacity of the pile, enhance the quality stability of the pile, and reduce the settlement of the pile foundation. For drilling and digging cast-in-place piles, practice has shown that good results have been achieved. This technology has been applied to thousands of pile foundation projects in more than 20 provinces and cities across the country. The structure of the prestressed ejection type pile side grouting valve of the present invention is di...

AI Technical Summary

Problems solved by technology

In addition, the sinking reinforcement cage needs to be lifted up repeatedly due to obstruction, which is very easy to wear the pile side grouting valve, resulting in grouting failure

If the binding margin is small, the grouting valve will be wrapped by the hardened concrete of the pile body, and the grouting effect cannot be ensured

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