Method and structure for reinforcing prefabricated prestressed beam-column joint through mixed fiber concrete

A technology for concrete reinforcement and beam-column joints, which is used in building maintenance, building construction, construction, etc. to achieve the effects of improving strength and bearing capacity, low engineering cost, and preventing danger.

Pending Publication Date: 2019-07-16
FUZHOU UNIV
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Its advantage is that the sprayed chopped fibers are randomly distributed and can withstand stress in any direction, but it requires large-scale shotcrete machinery.

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  • Method and structure for reinforcing prefabricated prestressed beam-column joint through mixed fiber concrete
  • Method and structure for reinforcing prefabricated prestressed beam-column joint through mixed fiber concrete
  • Method and structure for reinforcing prefabricated prestressed beam-column joint through mixed fiber concrete

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Embodiment Construction

[0032] In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with reference to the accompanying drawings, but the present invention is not limited thereto.

[0033] refer to Figure 1 to Figure 10

[0034] A method for reinforcing prefabricated prestressed beam-column joints with mixed fiber concrete, comprising the following steps:

[0035] (1) Use steel pipe brackets to support the undamaged beam bottoms on both sides of the cast-in-place columns of prefabricated prestressed beam-column joints, such as image 3 shown;

[0036] (2) Use a drilling machine to grind the diagonal area of ​​the concrete in the damaged area of ​​the plastic hinge at the beam end, such as Figure 4 shown;

[0037] (3) Set shear keys at the intact beam end section area and the core area section, and do a chisel treatment at both ends of the shear key. The shear key is as follows: Figu...

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Abstract

The invention relates to a method and structure for reinforcing a prefabricated prestressed beam-column joint through mixed fiber concrete. The method comprises the following steps that undamaged beambottoms on the two sides of a cast-in-place column of the prefabricated prestressed beam-column joint are supported through steel pipe supports; a concrete diagonal area of a damaged area of a beam end plastic hinge is polished by using a drilling machine; anti-shearing keys are arranged at an intact beam end section area and a core area section, and chiseling treatment is carried out on two endsof the anti-shearing keys; steel-polypropylene fiber concrete is poured into the polished area, regional diagonal replacement is carried out on the damaged area of the beam end plastic hinge, and vibrating while pouring is conducted; the poured area is covered, moisturized and maintained; after the poured area reaches 80% of the design strength, the remaining area is polished, and the steel-polypropylene fiber concrete is used to pour the polished area, and vibrating while pouring is conducted, so as to complete replacement; and reinforcement is finished when the remaining area reaches the reinforcement design strength. The damaged concrete is directly replaced by a steel-polypropylene fiber concrete replacement method.

Description

technical field [0001] The invention relates to a method and structure for reinforcing prefabricated prestressed beam-column joints with mixed fiber concrete. Background technique [0002] The existing reinforcement methods are generally to strengthen the damaged position after grinding or directly externally, without considering the connection between old and new concrete, on-site construction and durability. On November 24, 2017, the State Intellectual Property Bureau published a patent application for a "concrete column reinforcement method based on green high-performance fiber-reinforced cement-based composite materials" (notification number: CN 107382187 A). The steps of the technical plan are: use a drilling rig to chisel off the loose concrete on the surface of the damaged column to expose a solid structural layer, remove impurities on the surface of the column, clean up floating dust and loose stones; support the formwork in the plastic hinge area; rinse with water b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G23/02
CPCE04G23/0218
Inventor 颜学渊周灵哲施燊王璇曹晨
Owner FUZHOU UNIV
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