CN-117846355-B - Multi-layer FRP plate composite anchorage device and preparation method thereof

CN117846355BCN 117846355 BCN117846355 BCN 117846355BCN-117846355-B

Abstract

The application discloses a multilayer FRP plate composite anchorage device and a preparation method thereof. The side wall of the outer sleeve is provided with a glue injection hole, the glue injection hole is close to the first insertion groove, the inner sleeve is connected to the inner wall of the outer sleeve in a sliding mode, one end of the inner sleeve, close to the top of the outer sleeve, is provided with a second insertion groove corresponding to the first insertion groove, the positioning block is fixedly arranged in the inner sleeve and located on one side, far away from the concrete beam, of the inner sleeve, a plurality of positioning grooves are arranged at intervals along the height of the positioning block, corresponding to and communicated with the second insertion groove, the height of one side, close to the second insertion groove, of the positioning groove is identical to the thickness of the FRP plate, the height of one side, far away from the second insertion groove gradually increases along the projection of a vertical plane, and the plurality of pushing bolts are arranged on the circumference of one side, far away from the concrete beam, of the gap. According to the application, the end parts of the multi-layer FRP plate are scattered, the bonding area of the FRP plate is increased, and the bonding type anchorage device and the clamping type anchorage device are combined to anchor the FRP plate for three times, so that the anchorage effect of the anchorage device is better.

Inventors

ZHAO YU
YANG BINGCHEN
YAO TIANYUN
ZHOU YONGJUN
YU XIANG
HU HAIYANG
Hou Peiyuan
XU FANGZHOU

Assignees

长安大学
西安桥邦工程检测有限公司

Dates

Publication Date: 20260505
Application Date: 20240119

Claims (3)

1. The multi-layer FRP plate composite anchorage device is characterized by comprising an outer sleeve (1), an inner sleeve (2), a positioning block (3) and a plurality of bolts A plurality of clamping pieces (4) and a plurality of pushing bolts (5); the bottom of the outer sleeve (1) is abutted against the concrete beam, and a gap (9) is formed between the outer sleeve and the concrete beam; A plurality of first insertion grooves (11) are formed in one side, far away from the concrete beam, of the gap (9), the first insertion grooves (11) are arranged at intervals along the height direction of the first insertion grooves, the top of the outer sleeve (1) is of an opening structure, glue injection holes (12) are formed in the side wall of the outer sleeve (1), and the glue injection holes (12) are close to the first insertion grooves (11); the inner sleeve (2) is slidably connected to the inner wall of the outer sleeve (1), the length of the inner sleeve is smaller than that of the outer sleeve (1), and a second insertion groove (23) corresponding to the first insertion groove (11) is formed in one end, close to the top of the outer sleeve (1), of the inner sleeve (2); The height of the first insertion groove (11) is equal to the thickness of the FRP plate (8), and the height of the second insertion groove (23) is larger than the thickness of the FRP plate (8); The positioning block (3) is fixedly arranged in the inner sleeve (2) and is positioned at one side of the inner sleeve (2) far away from the concrete beam, and a plurality of positioning grooves (31) are formed at intervals along the height of the positioning block; The positioning groove (31) corresponds to and is communicated with the second insertion groove (23), the height of one side of the positioning groove (31) close to the second insertion groove (23) is the same as the thickness of the FRP plate (8), and the height of one side of the positioning groove far away from the second insertion groove (23) gradually increases along the projection of a vertical plane; A plurality of clamping pieces (4) configured to be inserted into the plurality of positioning grooves (31) and located at both sides of the FRP plate (8) to clamp the FRP plate (8); A plurality of pushing bolts (5) are arranged in the circumferential direction of one side of the gap (9) away from the concrete beam and are configured to push the inner sleeve (2) to move; The inner sleeve (2) comprises a first sleeve (21) and a second sleeve (22); The first sleeve (21) is in butt joint with the second sleeve (22), and the first sleeve (21) and the second sleeve (22) are both connected to the inner wall of the outer sleeve (1) in a sliding manner; The first sleeve (21) is close to the first insertion groove (11), and a second insertion groove (23) is arranged at one end far away from the second sleeve (22); the positioning block (3) is fixedly arranged in the second sleeve (22); also comprises a plurality of bearing platforms (7); The bearing platforms (7) are fixedly arranged in the first sleeve (21) and are arranged at intervals along the height direction of the first sleeve (21), gaps formed between the bearing platforms (7) and the inner wall of the inner sleeve (2) and between the bearing platforms (7) and the bearing platforms (7) are communicated with the second insertion groove (23), the height of the gaps is larger than the thickness of the FRP plate (8), and the bearing platforms (7) are configured to support the FRP plate (8); the bearing platforms (7) are symmetrically arranged on two side walls of the first sleeve (21); also comprises a limiting device (6); The limiting device (6) is arranged between the inner sleeve (2) and the outer sleeve (1) and is configured to prevent the inner sleeve (2) from rotating when the inner sleeve moves; a limit boss (61) is arranged on the side wall of the inner sleeve (2); A limiting groove (62) corresponding to the limiting boss (61) is formed in the side wall of the outer sleeve (1); The concrete beam-free concrete beam comprises an outer sleeve (1), and also comprises a cover plate (10), wherein the cover plate (10) is arranged at one end of the outer sleeve (1) far away from the concrete beam; the bottom of the outer sleeve (1) comprises a bottom plate (13) and two parallel connecting plates (14) which are vertically connected with the bottom plate (13); One end, far away from the bottom plate (13), of the connecting plate (14) is abutted against a concrete beam; and a plurality of second inserting grooves (23) and a plurality of pushing bolts (5) are formed in one side, facing the concrete beam, of the bottom plate (13).
2. A method of making a multilayer FRP panel composite anchor of claim 1, comprising: Establishing a three-dimensional solid model of the outer sleeve (1), the inner sleeve (2) and the clamping piece (4), and then 3D printing the three-dimensional solid model to obtain the outer sleeve (1), the inner sleeve (2) and the clamping piece (4); uniformly mounting a plurality of pushing bolts (5) on the circumference of one side of the gap (9) away from the concrete beam; Correspondingly passing the multi-layer FRP plate (8) through the first insertion groove (11), the second insertion groove (23) and the positioning groove (31); after pre-tightening force is applied to the FRP plates (8) to the expected pre-tightening force, the clamping pieces (4) are arranged on two sides of each layer of FRP plates (8) to realize primary anchoring; one end of the inner sleeve (2) close to the top of the outer sleeve (1) is abutted against the pushing bolt (5), and the pushing bolt (5) is rotated to enable the inner sleeve (2) to move towards a direction away from the first insertion groove (11), so that the extrusion force of the clamping piece (4) and the FRP plate (8) is increased, and the second anchoring is achieved; after the inner sleeve (2) moves, the glue injection hole (12) is positioned between the first insertion groove (11) and the second insertion groove (23), the adhesive is injected through the glue injection hole (12), the adhesive enters the inner sleeve (2) through the second insertion groove (23), after the adhesive is solidified, the third anchoring is realized, and the multi-layer FRP plate (8) composite anchorage is obtained.
3. The method of manufacturing a multilayer FRP plate composite anchorage of claim 2, characterized in that 3D printing comprises: modeling by using modeling software to obtain a model of the part to be printed, and exporting the model into an STL format file; importing the STL format file into 3D printing slicing software to carry out slicing processing to obtain slicing data, and printing the slicing data by using a 3D printer.

Description

Multi-layer FRP plate composite anchorage device and preparation method thereof Technical Field The application relates to the technical field of anchorage devices, in particular to a multilayer FRP plate composite anchorage device and a preparation method thereof. Background The carbon fiber plate is a high-performance composite material, and the main component is carbon fiber which is formed by stacking organic fibers such as flaky graphite microcrystals along the axial direction of the fiber. And combining the carbon fiber with the resin through a special processing technology to prepare the plate. The carbon fiber plate can realize high bearing capacity and large span, so that the carbon fiber plate can reach larger ultimate bearing capacity under the condition of the same section. Currently, existing carbon fiber sheet anchors exhibit high efficiency when anchoring a single layer carbon fiber sheet of relatively thin thickness. However, when thicker carbon fiber plates or a plurality of parallel single-layer carbon fiber plates are used, the anchoring efficiency is significantly reduced. Existing anchors for FPR panels mostly employ clamp anchors. The clamping type anchorage device mainly depends on the clamping piece conical plug to generate annular pressure on the FRP plate, so that the clamping effect is generated, and the prestress plate is anchored. However, when the clamping anchor is in a working state with a large fatigue stress amplitude for a long time, a notch effect is easy to generate, so that the FRP plate is subjected to shearing damage. Meanwhile, although efficient anchoring can be realized through the friction force and the transverse pre-stress of the clamping groove and the carbon fiber plate, when the material is damaged by fatigue caused by long-term use or stress mutation of the anchor, the transverse pre-stress can be reduced or even eliminated, the friction force can be reduced, and the carbon fiber plate and the clamping groove slide, so that the anchoring effect is greatly reduced, and even the anchoring effect is completely lost. Disclosure of Invention The embodiment of the application provides a multilayer FRP plate composite anchorage device and a preparation method thereof. The technical problem that in the prior art, the anchoring of the multi-layer FRP plate is easy to slip between the carbon fiber plate and the clamping groove, and the anchoring effect is reduced is solved. In a first aspect, an embodiment of the present application provides a multi-layer FRP board composite anchorage device, including an outer sleeve, an inner sleeve, a positioning block, a plurality of clamping members, and a plurality of pushing bolts; the bottom of the outer sleeve is abutted against the concrete beam and forms a gap with the concrete beam; a plurality of first insertion grooves are formed in one side, far away from the concrete beam, of the gap, the first insertion grooves are arranged at intervals along the height direction of the first insertion grooves, the top of the outer sleeve is of an opening structure, a glue injection hole is formed in the side wall of the outer sleeve, and the glue injection hole is close to the first insertion grooves; the inner sleeve is slidably connected to the inner wall of the outer sleeve, the length of the inner sleeve is smaller than that of the outer sleeve, a second insertion groove corresponding to the first insertion groove is formed in one end, close to the top of the outer sleeve, of the inner sleeve, the first insertion groove is equal to the thickness of the FRP plate, the second insertion groove is higher than the thickness of the FRP plate, the positioning block is fixedly arranged in the inner sleeve and located on one side, far from the concrete beam, of the inner sleeve, a plurality of positioning grooves are formed in the inner sleeve at intervals along the height of the inner sleeve, the positioning grooves correspond to and are communicated with the second insertion groove, the height, close to one side of the second insertion groove, of the positioning grooves is the same as the thickness of the FRP plate, the height, close to one side, of the second insertion groove is gradually increased along the projection of the vertical plane, the plurality of clamping pieces are configured to be inserted into the positioning grooves and located on two sides of the FRP plate to clamp the FRP plate, and the bolts are arranged on the circumference of one side, far from the concrete beam, close to the gap, and are configured to push the inner sleeve to move. With reference to the first aspect, in a possible implementation manner, the inner sleeve comprises a first sleeve and a second sleeve, the first sleeve is in butt joint with the second sleeve, the first sleeve and the second sleeve are both connected to the inner wall of the outer sleeve in a sliding mode, a second insertion groove is formed in one end, close to the first insertion gro