Method for pulling pillar through prestress using non-binding steel strands

Abstract

The invention discloses a method for pulling a pillar through prestress using non-binding steel strands. The method comprises a method of pulling the pillar through external prestress and a method of pulling the pillar through internal prestress, wherein the method of pulling the pillar through external prestress comprises the following steps: the bottom parts of the non-binding steel strands which are separately of a two-fold line shape or a three-fold line shape are inserted into the pillar, or the bottom parts of the non-binding steel strands support a bearing plate at the bottom of a girder on the two sides of the pillar; after the prestress is applied, an opposite force is generated at the pillar to balance the axial force of the pillar; and then the bearing pillar is pulled out. The method of pulling the pillar through internal prestress comprises the following steps: a non-binding steel strand internal prestress girder is arranged on the outer side of the original reinforced concrete girder on the two sides of the pillar, and the two sides and the bottom surface of the original reinforced concrete girder are wrapped inside; non-binding steel strands which are separately of a three-fold line shape or a parabola shape are arranged in the girder, and linear non-prestressed rebars are arranged; after the prestress is applied, an opposite bending moment is generated by the girder, so that a bending moment generated by load is balanced; and then the pillar is pulled out. The method disclosed by the invention fills the gap in pillar pulling rebuilding technology in China, and has the advantages that the construction is simple; unloading is not needed; temporary support does not need to be additionally arranged; the construction period is short; the cost is low; a structure above is not affected; the service life is consistent with that of an original structure; and the like.

Description

technical field [0001] The invention relates to the technical field of construction engineering transformation, in particular to a method for pulling out prestressed columns with unbonded steel strands. Background technique [0002] The load-bearing column is the most important force-bearing member of the whole house and the foundation to ensure the stability of the whole house. However, with the development of production and the change of use function, sometimes the original pillars need to be pulled out. But there is no relevant technology at present that can pull out the load-bearing column, so the current technology is still a blank in this technical field. Contents of the invention [0003] The object of the present invention is to provide a method for pulling out prestressed columns with unbonded steel strands, so as to solve the problems raised in the above-mentioned background technology. [0004] In order to achieve the above object, the present invention provid...

AI Technical Summary

Problems solved by technology

However, there is no relevant technology that can pull out the load-bearing column, so the current technology in this technical field is still a blank

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