Underwater concrete bottom sealing construction method for vertical shaft

Abstract

The invention discloses a vertical shaft underwater concrete bottom sealing construction method which comprises the steps that at least two wedge-shaped flow guide limiting blocks arranged in the circumferential direction of a lowermost section of guide pipe are installed on the inner wall of the bottom of the lowermost section of guide pipe, and a waterproof rubber plug is installed at the bottom of the lowermost section of guide pipe for sealing; other sections of guide pipes are assembled in sequence, and the bottoms of the assembled guide pipes make direct contact with the bottom face of the foundation pit; concrete is poured into the assembled guide pipe until the assembled guide pipe is filled with the concrete; the assembled guide pipe is lifted to the set suspension height, concrete is continuously poured in the process till the initial pouring amount requirement is met, and the waterproof rubber plug is made to be disengaged from the assembled guide pipe under the self-weight effect of the concrete; and concrete is continuously poured to the designed elevation, and bottom sealing construction is completed. The method has the advantages that the construction efficiency can be improved while the underwater concrete pouring quality can be improved, operation is easy, only a traditional pouring method needs to be simply improved, and application and popularization are facilitated.

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