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Unbonded prestressed concrete structure beam plate punching method

A concrete structure and prestressing technology, which is applied in building construction, building maintenance, construction, etc., can solve problems such as accidents, elastic retraction of steel strands, and adverse effects of retained structures, so as to prevent adverse effects and avoid elastic retraction Effect

Inactive Publication Date: 2021-02-12
杭州圣基建筑特种工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the unbonded prestressed structure, if the hole is removed according to the conventional method (broken first and then anchored), when the prestressed tendon is cut off, the sudden release of the prestress will cause the elastic retraction of the steel strand, resulting in the failure of the anchor at the other end and causing Accidents that adversely affect the preserved structure

Method used

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  • Unbonded prestressed concrete structure beam plate punching method
  • Unbonded prestressed concrete structure beam plate punching method
  • Unbonded prestressed concrete structure beam plate punching method

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Embodiment Construction

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings, and specific implementation methods will be given.

[0019] The invention discloses an unbonded prestressed concrete structure beam slab opening method, which adopts the technology of first anchoring and then breaking the unbonded prestressed tendons, that is, the unbonded prestressed steel strand is placed on the edge of the reserved part of the beam before the demolition The end adopts a construction method in which a special open anchor is first anchored, then cut off, and then removed. Open anchors can keep the stress state of the prestressed tendons in the reserved part unchanged, so as to ensure the structural safety of the remaining part of the building, including the following steps:

[0020] 1) Manually chisel the concrete, find out the prestressed tendons, and set the prestressed steel support on the adjacent span; if figure 1 shown.

[0021] The s...

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Abstract

The invention discloses an unbonded prestressed concrete structure beam plate punching method. The unbonded prestressed concrete structure beam plate punching method comprises the following steps that(1), concrete is manually chiseled, prestressed tendons are found out, and a prestressed steel support reverse top is arranged adjacent to a span; (2), an open anchorage device matched with the prestressed tendons is installed; (3), the prestressed tendons at the two ends in the same hole are sequentially cut off; and (4), the concrete at the punching position is disassembled. According to the unbonded prestressed concrete structure beam plate punching method, the unbonded prestressed concrete structure is punched through the method that anchoring is carried out before breaking and a prestressed steel support is additionally arranged, elastic retraction of steel strands can be effectively avoided when the prestressed tendons are cut off, and adverse effects on a reserved structure are prevented.

Description

technical field [0001] The invention belongs to the technical field of structural reinforcement and transformation in building construction, and in particular relates to a method for opening holes in beams and slabs of unbonded prestressed concrete structures. Background technique [0002] Unbonded prestressed concrete structure refers to the post-tensioned prestressing method of unbonded prestressed tendons that can maintain relative sliding between the configuration and the concrete. It is widely used in long-span beam-slab structures and beamless buildings in earthquake-resistant areas below the seventh degree. cover. In recent years, due to changes in the use and function of buildings, there have been more and more renovation projects on unbonded prestressed concrete structures, especially renovations such as the removal of openings in beams and slabs. For the unbonded prestressed structure, if the hole is removed according to the conventional method (broken first and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G23/02E04G23/08E04G21/12
CPCE04G21/12E04G23/02E04G23/08
Inventor 张林波王擎忠
Owner 杭州圣基建筑特种工程有限公司
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