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Strengthening method for armoured concrete slab

A reinforced concrete slab and anchoring technology, which is applied in the processing of building materials, building maintenance, construction, etc., can solve the problem of limited restoration of original structural performance, complex structural measures, high bond stress between high-strength steel strands and polymer mortar, etc. problems, to achieve the effect of improving safety and seismic performance, improving reliability and economy, and improving joint working performance

Inactive Publication Date: 2010-09-15
HUAIHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The strength of high-strength steel strand (wire rope) is as high as 1500-1600MPa, but the elastic modulus is low (about 1.1-1.5×10 5 MPa, common steel is about 2.1×10 5 MPa), as the post-added material of the structure, the material will play a role only after the structure is further loaded and the deformation increases, and its stress hysteresis is serious. Even if the structure is unloaded, the stress level is still very low under normal working conditions. Only about 100-150MPa, the strength of the material cannot be fully utilized, and the reinforcement efficiency is low;
[0004] (2) The post-added material is passively stressed and cannot realize the unloading effect on the original structure. The stress level is not coordinated with the original structure. The original structure may still be in a high stress state, and it is easy to be broken by each in the limit state. The seismic performance of the structure is unfavorable;
[0005] (3) This reinforcement method cannot realize the active repair and closure function of cracks, and has limited effect on restoring the original structure;
[0006] (4) In order to ensure the anchorage of the steel strand and prevent the stripping of the reinforcement layer, the construction measures adopted are complicated, which increases the cost;
[0007] (5) The force transmission of the high-strength steel strand mainly depends on the polymer mortar. The interface stress between the polymer mortar and the concrete component and the bonding stress level between the high-strength steel strand and the polymer mortar are relatively high. and construction requirements are high, not only the cost is high, but the reliability is relatively poor

Method used

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  • Strengthening method for armoured concrete slab
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  • Strengthening method for armoured concrete slab

Examples

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Embodiment 1

[0034] Example 1. refer to Figure 2-5 . A reinforcement method for a reinforced concrete slab, which uses a permanent mechanical anchoring device to install a cable 1 in the tension area of ​​the reinforced concrete slab; after anchoring, use the reinforced concrete slab as a counter force device 1 Perform transverse tension to apply prestress and fix it, and then apply polymer mortar to cover the entire anchoring device and cable 1.

Embodiment 2

[0035] Example 2. The reinforcing method of the reinforced concrete slab described in embodiment 1, its specific steps are as follows: (1) cleaning is reinforced the reinforced concrete slab surface, exposes the concrete structure layer; On the reinforced reinforced concrete slab, an anchor bolt group and a steering bolt group are set; Every 2 groups of anchor bolt groups are used in conjunction with 1 group of steering bolt groups, and the steering bolt group is set in the middle of the 2 groups of anchor bolt groups; Material 1 is bypassed from one group of anchor bolt groups to another group of anchor bolt groups and preliminarily tensioned, then the anchor plate 4 with adhesive material on the bottom is installed on the anchor bolt group and tightened, and finally the cable is locked with a lock. The material 1 is locked; each anchor bolt group is provided with at least 2 anchor bolts 3, and each steering bolt group is provided with at least 1 steering bolt 2;

[0036] (2...

Embodiment 3

[0037] Example 3. In the reinforcement method for reinforced concrete slabs described in Example 2, the cable material 1 is continuously wound during installation, and cut off after bypassing all the anchor bolts 3 continuously.

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Abstract

The invention relates to a strengthening method for an armoured concrete slab. In the method, a permanent mechanical anchor device is adopted to install a cable in a pulled area of a strengthened armoured concrete slab; after anchoring, the strengthened armoured concrete slab is used as a counter-force device to transversely stretch the cable, apply prestress to the cable and fix the cable, and polymer mortar is coated to cover the whole anchor device and the cable. The method has the advantages that the cable is in a tensioning state, is solid and firm after being subjected to stretching and prestress by the easy permanent mechanical anchoring without any auxiliary anchoring components and complex structures; a transverse stretching method is adopted to apply prestress to the cable, thereby not only overcoming the problem of lagged stress of high-strength materials but also being convenient to realize in the strengthening site and achieving the advantages of simple and convenient operation and low cost; the method has two-way prestress effect, thereby being particularly suitable for a condition that longitudinal crack occurs to a prestress cored slab in a strengthening bridge structure, and effectively solving the problem of longitudinal crack strengthening of the prestress cored slab in bridge engineering.

Description

technical field [0001] The invention relates to a building reinforcement method, in particular to a reinforcement method for a reinforced concrete slab. Background technique [0002] The reinforcement method for reinforced concrete slabs used in the prior art is the high-strength steel strand-polymer mortar reinforcement technology. It lays the steel hinge wire mesh on the tensile area of ​​the reinforced member, and coats the polymer mortar on its surface. Among them, the steel hinge is the main body of the force, and its tensile strength is higher than that of ordinary steel bars in the reinforced structure; the thickness of the polymer mortar surface layer is generally 25-50mm, and it protects the steel hinge mesh on the one hand. At the same time, it is bonded to the original structure to form a whole, so that the steel hinge mesh and the original structure work together. The main drawbacks of this technique are: [0003] (1) The strength of high-strength steel strand...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G23/02E04G21/12
Inventor 李青松蒋德稳姚锦文蒋应柏杨善金
Owner HUAIHAI INST OF TECH
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