CN117845786A - Variable-curvature wedge-shaped clamping piece type anchorage device for multi-layer carbon fiber plates - Google Patents
Variable-curvature wedge-shaped clamping piece type anchorage device for multi-layer carbon fiber plates Download PDFInfo
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- CN117845786A CN117845786A CN202410057867.4A CN202410057867A CN117845786A CN 117845786 A CN117845786 A CN 117845786A CN 202410057867 A CN202410057867 A CN 202410057867A CN 117845786 A CN117845786 A CN 117845786A
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- variable
- curvature
- wedge
- clamping piece
- carbon fiber
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- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 58
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 58
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 239000000084 colloidal system Substances 0.000 claims abstract description 9
- 230000002787 reinforcement Effects 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 31
- 238000000034 method Methods 0.000 description 7
- 238000004873 anchoring Methods 0.000 description 5
- 238000005488 sandblasting Methods 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000004918 carbon fiber reinforced polymer Substances 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- 239000004567 concrete Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Landscapes
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses a multi-layer carbon fiber plate variable-curvature wedge-shaped clamping piece type anchorage device for the field of building reinforcement, which comprises an anchorage head and a clamping piece; the clamping piece comprises a variable-curvature wedge-shaped upper clamping piece and a variable-curvature wedge-shaped lower clamping piece; the variable-curvature wedge-shaped upper clamping piece and the variable-curvature wedge-shaped lower clamping piece are the same in size and opposite in curvature; the whole anchor head is cuboid, a conical hole is longitudinally formed, the hole end is rectangular, the hole of the loading end is smaller, and the hole of the free end is larger; the outer ends of the variable-curvature wedge-shaped clamping pieces and the inside of the anchor head are provided with circular arc-shaped chamfers, the curvature surfaces of the inner surfaces of the two variable-curvature wedge-shaped clamping pieces are bonded with the multi-layer carbon fiber plates through colloid, and the clamping pieces are inserted into the large hole ends of the anchor head after being bonded with the multi-layer carbon fiber plates. The invention can solve the problem that the multilayer carbon fiber plate is abnormally damaged at the loading end of the anchorage device due to stress concentration, and has convenient and fast field assembly, high efficiency and good construction universality.
Description
Technical Field
The invention relates to the field of reinforcement of carbon fiber reinforced polymer plates, in particular to a variable-curvature wedge-shaped clamping piece type anchorage for a multi-layer carbon fiber plate.
Background
The bearing capacity of the reinforced concrete building elements is insufficient due to the increase of the service life or other natural reasons. Therefore, it is important to reinforce the damaged building. At present, carbon fiber plates are widely applied to reinforcement, upgrading and reconstruction of concrete members. The carbon fiber plate can endow the reinforced building with higher limit load and shear stress, and the utilization rate of the concrete member is improved.
With the development of reinforcement technology, single-layer carbon fiber plates may not bear a larger tensile force value, and multi-layer carbon fiber plate reinforcement technology has been developed, but the multi-layer carbon fiber plates have higher requirements on anchorage devices. The anchoring device is required to keep the synergic performance of the multi-layer carbon fiber board so as to ensure that the multi-layer carbon fiber board exerts the maximum strength, and attention is paid to avoiding the stress concentration phenomenon of an anchoring area of the multi-layer carbon fiber board and avoiding abnormal damage of the multi-layer carbon fiber board. The anchorage is the core of an anchorage system, most of mechanical anchorage is not glued when in design, and the anchorage efficiency is low only by virtue of extrusion stress and friction force, so that the phenomenon of anchor release of the carbon fiber plate in the tensioning process is possibly caused. Mechanical-chemical adhesive anchors refer to anchors in which the carbon fiber plate is bonded to the anchor by a glue, such as a partial wedge anchor, and the existing wedge anchor loading end typically generates severe stress concentrations, resulting in greater shear stress on the carbon fiber plate and premature failure.
Patent CN115680308A discloses a fixture device for anchoring an anchor of a flat tooth engagement type prestressed CFRP reinforced concrete beam, which solves the structural failure problem caused by the loosening or stress concentration tearing damage of an anchor of a prestressed CFRP plate reinforcing member, is convenient to construct, but is not suitable for a multi-layer carbon fiber plate, so that the requirement of a larger tensile force value cannot be met.
The patent CN114370013A discloses a variable curvature clamping type anchor and a design method thereof, wherein the variable curvature clamping type anchor is suitable for single-layer FRP plates and multi-layer FRP plates, can effectively improve stress distribution in the anchor and reduce stress concentration at a loading end of the anchor, but adopts a mechanical clamping method, so that when a multi-layer carbon fiber plate is anchored, the anchor can be off due to larger tensile force value.
Disclosure of Invention
In order to solve the problem that the existing carbon fiber plate anchorage is only suitable for single-layer carbon fiber plates and the anchorage efficiency of partial multi-layer carbon fiber plates is low, the invention provides a variable-curvature wedge-shaped clamping piece type anchorage for multi-layer carbon fiber plates.
The technical scheme adopted for solving the technical problems is as follows: a variable curvature wedge clip type anchor for multi-layer carbon fiber board. The device comprises an anchor head and a clamping piece, wherein the clamping piece comprises a variable-curvature wedge-shaped upper clamping piece and a variable-curvature wedge-shaped lower clamping piece.
The variable-curvature wedge-shaped upper clamping piece and the variable-curvature wedge-shaped lower clamping piece are identical in size and opposite in curvature, and the wavy parts on the inner surfaces of the two variable-curvature wedge-shaped clamping pieces are bonded with the multi-layer carbon fiber plates through colloid.
The whole anchor head is cuboid, vertically has the bell mouth, and the hole end is rectangle, and loading end hole is less, and the free end hole is great.
The colloid is used for tightly binding the variable-curvature wedge-shaped upper clamping piece, the variable-curvature wedge-shaped lower clamping piece and the multi-layer carbon fiber board into a whole, and the variable-curvature wedge-shaped clamping piece is inserted into the large hole end of the anchor head after being bonded with the multi-layer carbon fiber board.
The invention also has the following additional technical characteristics:
preferably: the outside of the variable-curvature wedge-shaped clamping piece and the inside of the anchor head are provided with chamfer angles, the chamfer angles are about 2mm in radius, and the chamfer angles are used for preventing stress concentration caused by extrusion of the variable-curvature wedge-shaped clamping piece and the anchor head.
Preferably: the inner diameter of the anchor head is 1.5mm larger than that of the variable-curvature wedge-shaped clamping piece, so that the variable-curvature wedge-shaped clamping piece can be conveniently and smoothly inserted into the conical hole of the anchor head.
Preferably: the surface of the variable curvature clamping piece adopts a sand blasting process to increase the surface roughness.
Preferably: and the surface of the anchoring area of the multilayer carbon fiber plate is increased in surface roughness by adopting a sand blasting process.
Compared with the prior art, the technical scheme provided by the invention has the beneficial effects that:
the invention can solve the problem that the carbon fiber plate is abnormally damaged at the loading end of the anchorage device due to stress concentration, and has convenient and fast field assembly, high efficiency and good construction universality. The invention is easy to process, has fewer parts and avoids the loss and the economic loss during transportation. The variable-curvature wedge-shaped clamping piece type anchorage device of the carbon fiber plate has larger clamping force, can effectively anchor the transverse carbon fiber plate, and reduces the sliding in the anchorage device.
Drawings
FIG. 1 is a schematic view of a multi-layer carbon fiber plate variable curvature wedge clip type anchor;
FIG. 2 is a plan view of a multi-layer carbon fiber plate variable curvature wedge clip anchor;
FIG. 3 is a schematic view of an anchor head;
fig. 4 is a schematic view of a variable curvature wedge clip.
In the drawings, the list of components represented by the various numbers is as follows: the device comprises an anchor head 1, a wedge-shaped variable-curvature clamping piece 2, a conical hole 3, a variable-curvature wedge-shaped upper clamping piece 4, a variable-curvature wedge-shaped lower clamping piece 5, a curvature 6, a circular arc chamfer 7, a large hole end 8, a multi-layer carbon fiber plate 9 and a small hole end 10.
Detailed Description
The invention is further described below in connection with the detailed description and the accompanying drawings.
As shown in fig. 1-4, the present invention provides a technical solution: a prestress anchor for highway bridge reinforcement comprises an anchor head 1 and a curvature-changing clamping piece 2. The whole anchor head 1 is cuboid, a conical hole 3 is longitudinally formed, the hole end is rectangular, the hole of the loading end is smaller, and the hole of the free end is larger; the number of the variable-curvature wedge-shaped clamping pieces is two, the sizes of the variable-curvature wedge-shaped upper clamping piece 4 and the variable-curvature wedge-shaped lower clamping piece 5 are the same, the curvatures 6 are opposite, arc-shaped chamfer angles 7 are arranged at the outer ends of the variable-curvature wedge-shaped clamping pieces and the inside of the anchor head, and the wavy parts of the inner surfaces of the two variable-curvature wedge-shaped clamping pieces are bonded with the multi-layer carbon fiber plates 9 through colloid; the clip is inserted through the large hole end 8 of the anchor head after being bonded with the multi-layer carbon fiber plate 9. The invention can solve the problem that the carbon fiber plate is abnormally damaged at the loading end of the anchorage device due to stress concentration, has high efficiency and larger clamping force, can effectively anchor the transverse carbon fiber plate, and reduces the slippage in the anchorage device.
The assembling method of the multi-layer carbon fiber plate variable-curvature wedge-shaped clamp type anchorage comprises the following steps:
firstly, calculating the specification and the layer number of the multi-layer carbon fiber plate according to the requirement, and cutting the carbon fiber plate according to the required length;
secondly, carrying out sand blasting on the anchoring area of the multilayer carbon fiber board, carrying out sand blasting on the variable-curvature wedge-shaped upper clamping piece and the variable-curvature wedge-shaped lower clamping piece, and increasing the friction coefficient;
thirdly, wiping the surfaces of the variable-curvature wedge-shaped upper clamping piece 4, the variable-curvature wedge-shaped lower clamping piece 5 and the multi-layer carbon fiber plate 9 to ensure that dust and other impurities are avoided;
fourthly, fully and uniformly stirring the double-component structural adhesive, keeping the surrounding environment clean, avoiding mixing impurities in the adhesive, smearing the mixed structural adhesive on the sand blasting parts on the front and back surfaces of the multi-layer carbon fiber plate and the curvature surfaces of the clamping pieces, wherein the widths of the carbon fiber plate and the variable curvature clamping pieces are equal, and the carbon fiber plate and the variable curvature clamping pieces are aligned during assembly;
fifthly, cutting off the colloid overflowing from the periphery of the multi-layer carbon fiber plates and the variable curvature clamping pieces when the colloid is assembled by using a blade before the colloid is completely solidified;
and sixthly, after the colloid is completely solidified, inserting the end, with smaller thickness, of the bonded variable-curvature wedge-shaped clamping piece into the large hole end 8 of the conical hole of the anchor head. The other end is to insert the multi-layer carbon fiber plate from the small hole end 10 of the anchor head taper hole, and then repeat the third, fourth and fifth steps. Bonding the multi-layer carbon fiber plate with the wedge-shaped variable-curvature clamping piece;
and seventhly, assembling two ends, and pre-tightening the glue by using a pre-tightening tool after the glue is completely solidified, so that the variable-curvature wedge-shaped clamping piece is tightly combined with the multi-layer carbon fiber plate and the anchor head. Curing for 48 hours at normal temperature and then putting the mixture into use.
When the specification parameters are adopted, the components of the anchorage device can achieve the optimal matching effect.
The embodiment of the invention does not limit the types of other devices except the types of the devices, so long as the devices can complete the functions.
Claims (4)
1. The variable-curvature wedge-shaped clamping piece type anchorage device for the multi-layer carbon fiber plate is characterized by comprising an anchorage head and a variable-curvature wedge-shaped clamping piece;
the variable-curvature wedge-shaped clamping piece comprises a variable-curvature wedge-shaped upper clamping piece and a variable-curvature wedge-shaped lower clamping piece; the variable-curvature wedge-shaped upper clamping piece and the variable-curvature wedge-shaped lower clamping piece are identical in size, but opposite in curvature;
the whole anchor head is cuboid, a conical hole is longitudinally formed, the hole end is rectangular, the hole of the loading end is smaller, and the hole of the free end is larger;
the outer ends of the variable-curvature clamping pieces and the inside of the anchor head are provided with circular arc chamfers, the wavy parts of the inner surfaces of the two variable-curvature clamping pieces are bonded with the multi-layer carbon fiber plates through colloid, and the variable-curvature clamping pieces are inserted into the large hole ends of the anchor head after being bonded with the multi-layer carbon fiber plates.
2. The variable curvature wedge clip type anchorage for multi-layered carbon fiber boards of claim 1, wherein the curvature of the variable curvature wedge clip varies continuously along the length of the clip.
3. The variable curvature wedge clip type anchorage for a multi-layered carbon fiber plate as claimed in claim 1, wherein the outer side of the variable curvature wedge clip and the inner side of the anchorage head are provided with chamfers.
4. A variable camber wedge clip type anchor for a multi-layered carbon fiber board according to claim 1, wherein the width of the tapered hole at the rear end of the anchor head is 1.5mm larger than the width of the variable camber wedge clip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410057867.4A CN117845786A (en) | 2024-01-15 | 2024-01-15 | Variable-curvature wedge-shaped clamping piece type anchorage device for multi-layer carbon fiber plates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410057867.4A CN117845786A (en) | 2024-01-15 | 2024-01-15 | Variable-curvature wedge-shaped clamping piece type anchorage device for multi-layer carbon fiber plates |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117845786A true CN117845786A (en) | 2024-04-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410057867.4A Pending CN117845786A (en) | 2024-01-15 | 2024-01-15 | Variable-curvature wedge-shaped clamping piece type anchorage device for multi-layer carbon fiber plates |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117845786A (en) |
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2024
- 2024-01-15 CN CN202410057867.4A patent/CN117845786A/en active Pending
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