Method for designing and constructing waterproof plate for underground garage by post-tensioning bonded prestressed construction process

Abstract

The invention relates to a method for designing and constructing a waterproof plate for an underground garage by a post-tensioning bonded prestressed construction process. The method is characterized in that the waterproof plate adopts a beamless structure comprising a bottom plate and a top plate, and is subjected to post-tensioning bonded prestressed construction; the method mainly comprises the steps of arranging bars, pouring, tensioning, grouting, and performing cutting and anchor sealing; before construction, the bar preparation scheme is determined through the lateral restraint analysis of the underground garage, and the occurrence of post-pouring belt cracks is avoided through staged tensioning and set temperature shrinkage; the tensioning end of a prestressed bar is arranged in the center of the bottom plate or a post-pouring belt region, so that the periphery can be subjected to soil covering and waterproof construction in time, and the construction period is shortened; the prestressed bar runs through the bottom of the pier cap of the pier of the bottom plate during arrangement, and a reinforcing bar does not need to be added to the pier cap, so that the cost is reduced.

Description

technical field [0001] The invention relates to a building construction method, in particular to a design and construction method of a post-tensioned underground garage waterproof board with bonded prestress. Background technique [0002] Prestressed concrete structures are divided into bonded prestressed concrete structures and unbonded prestressed concrete structures according to the bonding between prestressed steel bars and concrete. Among them, bonded prestressed concrete structures are a new structure Compared with the unbonded prestressed concrete structure, it has the advantages of high structural safety, good durability, and steel saving, and has been more and more widely used. [0003] Although bonded prestressing is relatively more reliable than unbonded prestressing, bonded prestressing is generally used in beam structures, while in slab structures, especially in underground garage projects, currently skilled personnel still Adopt unbonded prestressed plate stru...

AI Technical Summary

Problems solved by technology

[0006] (3) A very important factor limiting the popularization of prestressing technology in underground garages is the construction period and cost. In most projects, prestressing and tensioning are trying After the block strength reaches 90%-100%, it will be stretched again. After the stretching is completed, the general contractor will be allowed to remove the formwork. The general contractor will increase the cost because the turnover materials cannot be delivered in time, and the owner is worried about the impact of the construction period.

[0008] After retrieving relevant documents, no post-tensioning method identical to the technical solution of the present invention has been found.

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