A low-pressure supplementary irrigation treatment method for grout leakage in the connecting cavity at the bottom of prefabricated shear walls

Abstract

The invention discloses a low-pressure replenishment grouting treatment method for grout leakage in a connecting cavity at the bottom of a prefabricated shear wall. Firstly, the grouting channel of the sleeve is drilled, and an endoscope is used to observe whether the grouting at the position of the grouting port in the sleeve is dense, and the grouting material Sleeves that do not reach the height of the grouting opening are marked as severely defective sleeves, otherwise they are marked as ordinary defective sleeves; then the serious defect sleeves are initially repaired in two stages, and the corresponding connected cavity area and The cavity at the bottom of the sleeve allows the height of the grout to reach the lower edge of the grout outlet of the sleeve. In the second stage, the inner cavity of the sleeve is replenished so that the height of the grout exceeds 2 / 3 of the height of the sleeve, and the seriously defective sleeve is transformed into a normal one. Defective sleeves; finally, single-hole grouting is carried out for each common defective sleeve through the grout outlet channel, and the refilling and remediation of prefabricated shear walls is completed after completion. The invention can meet the supplementary irrigation demands of different slurry leakage working conditions, and achieve the expected supplementary irrigation treatment effect.

Description

technical field [0001] The invention relates to the technical field of prefabricated buildings, in particular to a low-pressure supplementary irrigation treatment method for grout leakage in a connecting cavity at the bottom of a prefabricated shear wall. Background technique [0002] In prefabricated building structures, especially in prefabricated concrete structures, component connection is a key node to ensure the overall quality of the structure. Rebar sleeve grouting connection is a common form of rebar connection in prefabricated concrete structures. It is a rebar connection device composed of a specially designed columnar sleeve and non-shrinkage grouting material as a binder. In order to ensure that the effective anchorage length of the steel bar meets the design requirements, the grouting material inside the sleeve must be fully filled. However, sometimes due to factors such as insufficient pressure holding before the end of grouting, untimely sealing of the grout...

AI Technical Summary

Problems solved by technology

For defect type 2, the traditional high-pressure grouting method cannot be used to re-grout, because the connecting cavity will continue to leak or even burst under high pressure, and the leaking part cannot be quickly and effectively blocked due to high-pressure grouting

It is also not possible to directly use the grout filling method of defect type 1. First, because the defects between adjacent sleeves are connected, it is impossible to pump air and replenish grout at the grout hole of a certain sleeve at the same time. The effect of negative pressure is formed. The second is that the defect is deep and also involves the inside of the connecting cavity, all of which are poured backward from the slurry outlet. The slurry flow path is too long, which affects the grouting effect.

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