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A method for reinforcing bridge members using polyurethane cement composite material and steel mesh

A cement composite material and polyurethane technology, which is used in bridges, bridge materials, bridge maintenance, etc., can solve the problems of inability to simultaneously improve the tensile and compressive strength of components, insufficient interface strength, and long construction period, and achieve obvious reinforcement effects. The effect of high bond strength and high material utilization

Inactive Publication Date: 2016-11-30
NORTHEAST FORESTRY UNIVERSITY
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Problems solved by technology

[0004] The invention aims to solve the problems of insufficient interface strength, self-heavy weight, cumbersome construction, long construction period and inability to simultaneously improve the tensile and compressive strength of components in the existing commonly used bridge reinforcement technology, and provides a method using polyurethane cement composite materials and steel bars Method of Mesh Strengthening Bridge Components

Method used

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  • A method for reinforcing bridge members using polyurethane cement composite material and steel mesh

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specific Embodiment approach 1

[0016] Specific implementation mode one: combine figure 1 Describe this embodiment in detail, a kind of method that utilizes polyurethane cement composite material and reinforcing bar mesh to strengthen the bridge member described in this embodiment, specifically carry out according to the following steps:

[0017] 1. On the surface of the maintenance and reinforcement parts of the bridge concrete structural components, a rough surface with a difference of unevenness greater than or equal to 6mm is chiseled, the surface of the bridge components is cleaned, and the maintenance and reinforcement parts of the bridge concrete structural components are dried;

[0018] 2. Implant connecting steel bars in the maintenance and reinforcement parts of bridge concrete structural members, hang steel mesh pieces on the connecting steel bars, and weld the steel mesh pieces and connecting steel bars at the same time;

[0019] The steel mesh sheet is a rectangular mesh welded by steel bars wit...

specific Embodiment approach 2

[0030] Embodiment 2: This embodiment differs from Embodiment 1 in that: in step 1, when the reinforcing bars of the maintenance and reinforcement parts of the bridge concrete structural members are corroded, the surface of the reinforcing bars should be derusted, degreased and polished to reveal metallic luster; When the cross-sectional area caused by the corrosion of the reinforcement is weakened to more than 1 / 10 of the original cross-section, the reinforcement should be supplemented; when the repair and reinforcement of the concrete structural members of the bridge has honeycomb pitting and the concrete falls off, the damaged part should be repaired locally; when the bridge concrete structure Grouting or sealing treatment should be carried out when the cracks in the component repair and reinforcement parts exist. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0031] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the connecting steel bars described in step 2 are ordinary steel bars or bolted anchor bars. Others are the same as in the first or second embodiment.

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Abstract

The invention provides a method for reinforcing a bridge member through a polyurethane-cement composite material and a reinforcing mesh, relates to the method for reinforcing the bridge member, and aims at solving the problems of insufficient interfacial strength, high dead weight, complex construction, long construction period and failure of synchronous improvement of tensile strength and compressive strength of the existing general bridge reinforcing technology. The method comprises the following steps: chiseling the surface of a repair reinforcing part of a concrete structural component of a bridge to obtain a rough surface; cleaning and drying the rough surface; embedding connecting reinforcing steel bars into the repair reinforcing part of the concrete structural component of the bridge; hanging reinforcing mesh pieces on the connecting reinforcing steel bars; welding the reinforcing mesh pieces with the connecting reinforcing steel bars; erecting a die plate; preparing the polyurethane-cement composite material; pouring the polyurethane-cement composite material on the surface layers of the reinforcing mesh pieces; maintaining in the natural conditions. The invention is applicable to the method for reinforcing a bridge member through a polyurethane-cement composite material and a reinforcing mesh.

Description

technical field [0001] The present invention relates to methods of strengthening bridge members. Background technique [0002] Nowadays, the commonly used bridge reinforcement methods include enlarging section reinforcement, pasting material reinforcement and other methods. Enlarging the section reinforcement improves the compressive / shear bearing capacity of the component by increasing the section height and thickness, but it is prone to the problem of insufficient strength of the new and old concrete joint surface, and the self-weight increases greatly, and the tensile capacity is not significantly improved; paste carbon fiber cloth The reinforcement method can make full use of the excellent tensile strength and stiffness of carbon fiber materials, but it is easy to fall off from the concrete due to excessive stiffness, and the cost of carbon fiber cloth is high. [0003] To sum up, the existing commonly used bridge reinforcement technology has the disadvantages of insuff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D22/00C04B28/02E01D101/26C04B24/42C04B24/12C04B24/28C04B103/50
Inventor 孙全胜高红帅张可心
Owner NORTHEAST FORESTRY UNIVERSITY
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