CN211949216U

CN211949216U - Reinforced bonding type ribbed FRP rib anchor

Info

Publication number: CN211949216U
Application number: CN202020132118.0U
Authority: CN
Inventors: 曹艳辉; 叶锦华; 王成宝; 王兴宝; 吴雷明; 侯巨伟; 徐晨光
Original assignee: Beijing Municipal Road and Bridge Co Ltd
Current assignee: Beijing Municipal Road and Bridge Co Ltd
Priority date: 2020-01-20
Filing date: 2020-01-20
Publication date: 2020-11-17
Anticipated expiration: 2030-01-20

Abstract

The utility model discloses a reinforcing bonding type ribbed FRP muscle anchor, glue, the steel casing pipe of inside threaded and the grout that excels in including ribbed FRP muscle, clamping device, epoxy. The clamping device is composed of three metal steel sheets which form an angle of 120 degrees with each other and a hollow cylinder which is connected with the steel sheets, and the hollow section of the hollow cylinder is square. The steel sleeve with the threads inside is provided with threads on the inner wall of the sleeve. The ribbed FRP ribs penetrate into a clamping device, and epoxy resin glue is injected into gaps between the ribbed FRP ribs and the clamping device to fix the ribbed FRP ribs and the clamping device. And then the assembled ribbed FRP ribs and the clamping device are placed into a steel sleeve with threads inside, and high-strength grouting material is injected. After curing, the ribbed FRP rib tensile test can be carried out. The anchoring device can realize short anchoring length and high anchoring efficiency, and can be applied to constructional engineering.

Description

Reinforced bonding type ribbed FRP rib anchor

Technical Field

The utility model relates to a novel take rib FRP muscle anchor among the building technical field, concretely relates to reinforcing bonding type takes rib FRP muscle anchor utensil.

Background

The application of Fiber Reinforced Polymer (FRP) in civil engineering is divided into two main categories, one is to use FRP bars to replace reinforcing steel bars for newly building structures, and the other is to use FRP bars for repairing and reinforcing old structures. At present, the research on FRP tendon prestressed reinforced concrete structure is generally regarded by the research institutions of various countries and the engineering community. The engineering examples of reinforcing the bridge by the FRP ribs are increasing day by day.

The FRP rib is formed by gluing continuous fibers and epoxy resin glue according to a certain proportion through an extrusion process, so that the axial mechanical property of the FRP rib depends on axial fiber yarns, and the lateral mechanical property of the FRP rib depends on the epoxy resin glue. In a new structure of replacing reinforcing steel bars with FRP bars, the FRP bars are a typical anisotropic material, and have lower lateral shear strength, obviously lower elastic modulus than reinforcing steel bars and high strength, which is different from the reinforcing steel bars. In the FRP rib drawing test, because the lateral shear strength of the FRP rib is lower, the existing FRP rib anchor mainly has a bonding type and a clamping type. If on directly pressing from both sides FRP muscle and test machine chuck, can be because FRP muscle shear strength is not enough takes place local shearing and splitting destruction, can not reach the test result of expectation, consequently can not use the ground tackle of reinforcing bar on the FRP muscle. With the wide development of the FRP rib in engineering, the problems of tensioning and anchoring of the end part of the FRP rib are increasingly prominent, and the problem of anchoring the FRP rib is particularly important. The FRP rib is prevented from being damaged by clamping in the loading process, and the tensile test, the bonding performance test and the end anchoring of the FRP rib become urgent matters. In order to prevent the FRP rib from being damaged due to insufficient local shear strength in the clamping process, the anchoring scheme of the existing FRP rib is developed on the basis of a bonding type anchorage device, namely, a sleeve is arranged at the end part of the FRP rib, epoxy resin glue or high-strength grouting material is filled in the FRP rib to anchor the FRP rib, and in the tensile test and the bonding performance test, the sleeve at the end part of the FRP rib is directly clamped on a chuck of a testing machine, so that the FRP rib is prevented from being damaged due to transverse shearing. The sleeve is generally a steel pipe, and the inner wall of the steel pipe is provided with threads. The clamp piece type and bonding type composite anchorage is adopted to anchor the FRP rib, and can be used for tensioning the FRP rib in actual engineering.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a reinforcing bonding type ribbed FRP muscle ground tackle mainly has good anchoring performance to ribbed FRP muscle when carrying out the stretch-draw to ribbed FRP muscle, strengthens the bonding between high strength grouting material and anchor to guarantee that ribbed FRP muscle can exert its good mechanical properties.

In order to realize the purpose, the utility model discloses a technical scheme:

the utility model provides a reinforcing bonding type ribbed FRP muscle anchor utensil, includes ribbed FRP muscle, clamping device, epoxy glue, inside threaded steel casing pipe and the grout material that excels in. The ribbed FRP ribs and the clamping device are connected through epoxy resin glue, the steel sleeve with threads inside is sleeved outside the clamping device, and high-strength grouting material is filled between the steel sleeve with threads inside and the clamping device.

The clamping device comprises two parts, wherein one part is a cylinder with a hollow middle shape, and the section of the hollow middle shape is square; the other part comprises three metal steel sheets which are obliquely penetrated into a cylinder with a hollow shape in the middle and fixed.

And threads are processed on the inner wall of the steel sleeve with the threads inside.

The reinforced bonding type ribbed FRP rib anchor has the advantages that the length of the side with the square hollow cross section is larger than or equal to the diameter of the ribbed FRP rib so as to restrain the ribbed FRP rib. After the ribbed FRP ribs are inserted into the square hollow parts in the clamping device, epoxy resin glue is filled in the gaps between the cylinders and the ribbed FRP ribs, and the clamping device and the ribbed FRP ribs are connected and fixed together.

In the reinforced bonding type ribbed FRP rib anchor, three metal steel sheets are obliquely penetrated and fixed in a hollow cylinder, are elastic steel sheets and have certain rigidity, and the three metal steel sheets mutually form an angle of 120 degrees in space; the diameter of the lower end metal steel sheet contacted with the ribbed FRP ribs is less than or equal to that of the ribbed FRP ribs, and the diameter of the upper end metal steel sheet contacted with the internally threaded steel sleeve is greater than or equal to that of the inner wall of the internally threaded steel sleeve. When the ribbed FRP bars are inserted into the middle hollow shape of the cylinder in the clamping device, the lower end metal steel sheet is propped open to clamp the ribbed FRP bars, and the friction between the ribbed FRP bars and the lower end metal steel sheet is increased to realize the enhancement of the bonding performance.

After the clamping device is fixed with the ribbed FRP ribs, the clamping device is placed into the steel sleeve with threads inside the steel sleeve until reaching a designed position, and the upper metal steel sheet overcomes rigidity shrinkage and contacts with the threads on the inner wall of the steel sleeve with threads inside the steel sleeve with threads, so that firstly, the self-centering function of the ribbed FRP ribs is realized, and the ribbed FRP ribs are always positioned at the center of the steel sleeve with threads inside the steel sleeve; and secondly, the upper metal steel sheet is mechanically meshed with the thread. And finally, pouring high-strength grouting material, thereby realizing the manufacture of the reinforced adhesive ribbed FRP rib anchor.

The high-strength grouting material is a common material for building construction.

The utility model has the advantages that:

the utility model discloses well ribbed FRP muscle anchor has adopted the clamp formula to anchor with the compound of formula that bonds, is a rare one in the current background art, strengthens the grout material that excels in simultaneously through a clamping device and steel casing pipe and the friction between clamping device and ribbed FRP muscle to realize ribbed FRP muscle bond property's reinforcing in stretch-draw, enable ribbed FRP muscle to reach the mechanical properties of ideal. The utility model has the advantages that easy operation, economy and anchor are effectual.

Drawings

Fig. 1 is a plan view of a clamping device.

Fig. 2 is an elevational view of the clamping device.

FIG. 3 is an assembly view of the ribbed FRP rib and the holding device.

Fig. 4 is a structural diagram of an anchor of reinforced adhesive FRP reinforcement.

In the figure: 1-ribbed FRP ribs; 2-a clamping device; 3-a metal steel sheet; 4-epoxy resin glue; 5-a steel sleeve with threads inside; 6-thread; 7-high-strength grouting material.

Detailed Description

The following description of the concrete embodiments of the reinforced adhesive ribbed FRP rib anchor of the present invention is made with reference to the accompanying drawings:

as shown in fig. 1, 2, 3 and 4, the body of the clamping device 2 comprises a hollow cylindrical body with a square shape in the middle and three metal steel sheets 3. The ribbed FRP bar 1 is inserted into a cylinder with a square hollow shape in the clamping device 2, and the side length of the square is approximately equal to or slightly larger than the diameter of the ribbed FRP bar, so as to fix and restrain the ribbed FRP bar 1. After inserting the clamping device 2 into the design position of the ribbed FRP rib 1, filling epoxy resin glue 4 into the gap between the clamping device 2 and the ribbed FRP rib 1, and bonding the clamping device 2 and the ribbed FRP rib 1 together. Meanwhile, the lower ends of the three metal steel sheets 3 obliquely penetrating into the cylinder of the clamping device 2 slightly expand to be in contact with the ribbed FRP rib 1, and the diameter of the lower ends of the three elastic metal steel sheets 3 is equal to or slightly smaller than that of the ribbed FRP rib 1, so that the purpose is to increase the friction between the ribbed FRP rib 1 and the lower end metal steel sheet 3 to enhance the bonding performance. The three metal steel sheets 3 have certain rigidity, and the three steel sheets form an angle of 120 degrees with each other in space. And then placing the test piece assembled by the ribbed FRP rib 1 and the clamping device 2 into the steel sleeve 5 with the threads inside until the design position, wherein the steel sleeve 5 with the threads inside is provided with fine threads 6 during manufacturing. In the process of putting in, the upper ends of the three metal steel sheets 3 overcome rigidity shrinkage and are in contact with the threads 6 on the inner wall of the steel sleeve 5 with threads inside, firstly, the clamping device 2 realizes the self-centering function of the ribbed FRP rib 1 in the anchorage device, so that the ribbed FRP rib 1 is always positioned in the center of the steel sleeve 5 with threads inside, and the bending or eccentric damage in the tensioning process is avoided; secondly, after the steel sheet is placed, the upper end metal steel sheet 3 and the thread 6 realize mechanical occlusion, and then high-strength grouting material is poured for maintenance. In the tensioning process, the self rigidity of the upper end metal steel sheet 3 and the mechanical engaging force of the threads 6 need to be overcome, and meanwhile, the friction force between the lower end metal steel sheet 3 and the ribbed FRP rib 1 and the mutual bonding force between the epoxy resin glue and the clamping device 2 and the ribbed FRP rib 1 need to be overcome, so that the reinforced bonding type ribbed FRP rib anchor is realized.

The foregoing has described the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and the description are only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, and these changes and modifications are all within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a reinforcing bonding type ribbed FRP muscle anchor which characterized in that: the reinforced FRP pipe comprises a ribbed FRP rib, a clamping device, epoxy resin glue, a steel sleeve with threads inside and high-strength grouting material; the ribbed FRP ribs are connected with the clamping device through epoxy resin glue, a steel sleeve with threads inside is sleeved outside the clamping device, and high-strength grouting material is filled between the steel sleeve with threads inside and the clamping device;

the clamping device comprises a cylinder with a hollow middle shape and three metal steel sheets which obliquely penetrate into the cylinder with the hollow middle shape and are fixed.

2. A reinforced cementitious ribbed FRP tendon anchor as claimed in claim 1, in which: the cross section of the middle hollow shape is square.

3. A reinforced cementitious ribbed FRP tendon anchor as claimed in claim 1, in which: and threads are processed on the inner wall of the steel sleeve with the threads inside.

4. A reinforced cementitious ribbed FRP tendon anchor as claimed in claim 2 in which: the side length of the square is more than or equal to the diameter of the ribbed FRP rib.

5. A reinforced cementitious ribbed FRP tendon anchor as claimed in claim 1, in which: the three metal steel sheets are elastic steel sheets which are 120 degrees in space.

6. A reinforced cementitious ribbed FRP tendon anchor as claimed in claim 1, in which: the diameter of the lower end metal steel sheet contacted with the ribbed FRP ribs is less than or equal to that of the ribbed FRP ribs, and the diameter of the upper end metal steel sheet contacted with the internally threaded steel sleeve is greater than or equal to that of the inner wall of the internally threaded steel sleeve.