CN212742214U - Anchor for fixing carbon fiber bar - Google Patents
Anchor for fixing carbon fiber bar Download PDFInfo
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- CN212742214U CN212742214U CN202021045307.0U CN202021045307U CN212742214U CN 212742214 U CN212742214 U CN 212742214U CN 202021045307 U CN202021045307 U CN 202021045307U CN 212742214 U CN212742214 U CN 212742214U
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- carbon fiber
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- fixing
- fiber bar
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Abstract
The utility model provides an anchorage device for fixing carbon fiber reinforcements, which comprises a first fixed block, a slide block, a second fixed block, a third fixed block, a connecting plate and a pressure spring; the first end of the carbon fiber bar is clamped by the first fixing block, and the second end of the carbon fiber bar is clamped by the sliding block; the first fixed block is fixed at the first end of the reinforced building, and the second fixed block is fixed at the second end of the reinforced building; a third fixed block is fixed between the first fixed block and the second fixed block; the connecting plate penetrates through the sliding block and is fixed between the second fixing block and the third fixing block, and a pressure spring is sleeved on the connecting plate between the third fixing block and the sliding block. The utility model has the advantages that: when the carbon fiber bar is clamped, the two ends of the carbon fiber bar can be effectively prevented from being damaged, and the characteristics of the carbon fiber bar are fully exerted. The utility model discloses not only can the fixed carbon fiber muscle of centre gripping, moreover, can overcome carbon fiber muscle effectively and the drawback that the junction that leads to by the reinforcement building coefficient of thermal expansion difference warp.
Description
Technical Field
The utility model relates to an anchorage device, specifically speaking, the utility model relates to an anchorage device for fixed carbon fiber muscle.
Background
In the technical field of bridge reinforcement, engineers usually add a plurality of transverse and longitudinal steel bars on the back of the bridge floor and between the piers, further pull the bridge body through the steel bars, enhance the crack resistance and the shock resistance of the bridge body, and structurally reinforce the bridge body. The disadvantages of this reinforcement are: 1. because the reinforcing steel bars are heavier, the whole weight of the bridge is obviously increased after the reinforcing steel bars are reinforced; 2. the thermal expansion and cold contraction coefficient of the reinforcing steel bars is large, the reinforcing steel bars are asynchronous with the original bridge body thermal expansion and cold contraction system, and the reinforcing steel bars cause the local deformation of the bridge body; 3. the construction period is long, and the construction work amount is large.
The carbon fiber is a high-strength high-modulus fiber with carbon content of more than 90 percent, and has the advantages of light weight, high axial strength and modulus, no creep deformation, high temperature resistance, corrosion resistance, scouring resistance, small thermal expansion coefficient, good corrosion resistance, good electromagnetic shielding property and the like. The carbon fiber is used as a new material with excellent performance, the density of the carbon fiber is less than 1/4 of steel, and the strength of the carbon fiber is 5-7 times of that of the steel; compared with an aluminum alloy structural member, the weight reduction effect of the carbon fiber composite material can reach 20-40%; compared with steel metal parts, the weight reduction effect of the carbon fiber composite material can reach 60-80%, so that the carbon fiber composite material is widely applied to the fields of industrial and civil buildings, railway and highway bridges, tunnels, chimneys, tower structures and the like in recent years.
In the engineering construction process, the polymer mortar is coated on the surface of the carbon fiber bar formed by the carbon fiber bundles, so that the reinforced surface can be well decorated and finished, the appearance is attractive, and the bearing capacity of the reinforced concrete structure can be remarkably improved due to the approximate characteristic of the temperature shrinkage modulus of the polymer mortar on the surface of the carbon fiber bar and the reinforced concrete structure, and the reinforcing and reinforcing effects are achieved.
Although the carbon fiber bar has high axial strength, the shear strength is weak, if the carbon fiber bar is directly fixed on a tensile testing machine for a tensile test, the tensile force can destroy two ends of the carbon fiber bar, if a common anchorage device is adopted to fix the carbon fiber bar, the contact surface of the carbon fiber bar and the anchorage device is easy to slip off or the carbon bar skin is destroyed, and normal tensioning cannot be carried out, so that the carbon fiber bar can be realized by developing a specially-made matched anchorage device if the prestress of a single carbon bar is ensured to be more than 1000 MPa.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is an object of the present invention to provide an anchor for fixing carbon fiber reinforcements.
In order to achieve the above purpose, the utility model adopts the following technical scheme: an anchorage device for fixing carbon fiber reinforcements comprises a first fixed block, a sliding block, a second fixed block, a third fixed block, a connecting plate and a pressure spring;
the first end of the carbon fiber bar is clamped by the first fixing block, and the second end of the carbon fiber bar is clamped by the sliding block;
the first fixing block is fixed at the first end of the reinforced building, and the second fixing block is fixed at the second end of the reinforced building; the third fixed block is fixed between the first fixed block and the second fixed block;
the connecting plate penetrates through the sliding block and is fixed between the second fixing block and the third fixing block, and the pressure spring is sleeved on the connecting plate between the third fixing block and the sliding block.
The pressure F of the pressure spring is KX, wherein: k is a compression spring constant, X is (L is deltaC is 12) is 10E-6, L is the total length of the carbon fiber rib, and deltaC represents the difference between the lowest temperature in winter and the highest temperature in summer.
Preferably, the first fixing block and the sliding block are both provided with blind holes, and the length of each blind hole is 1% of the total length of the carbon fiber bar; the inner diameter of the blind hole is 0.2-0.5mm larger than the diameter of the carbon fiber bar.
Preferably, the first fixing block is formed by fixing a first block body and a second block body through bolts; when the first block body and the second block body are connected and fixed together, a gap of 1mm is reserved between the first block body and the second block body;
and semi-cylinders with the diameter being 0.2-0.5mm larger than the diameter of the carbon fiber bar and the depth being 1% of the total length of the carbon fiber bar are respectively arranged on the adjacent side walls of the first block body and the second block body, and when the first block body and the second block body are fixed through bolts, the two semi-cylinders form the blind holes for clamping the carbon fiber bar.
Preferably, the sliding block is formed by fixing two block bodies through bolts, and a gap of 1mm is reserved between the two block bodies; and when the two blocks are fixed through bolts, the two semi-cylinders form the blind holes for clamping the fixed carbon fiber bars.
Preferably, the inner wall of the semi-cylinder is a smooth inner wall or a non-smooth inner wall.
The utility model discloses not only can the fixed carbon fiber muscle of centre gripping, moreover, can overcome carbon fiber muscle effectively and the drawback that the junction that leads to by consolidating the difference of building thermal expansion coefficient warp, and when centre gripping carbon fiber muscle, can avoid carbon fiber muscle both ends to be destroyed, full play carbon fiber muscle's characteristic effectively.
Drawings
FIG. 1 is a schematic view of the anchor device for fixing carbon fiber bars according to the present invention;
FIG. 2 is a schematic structural view of the present invention without a pressure spring;
FIG. 3 is a schematic view of the installation of the present invention;
fig. 4 is a side view of the first fixing block of the present invention.
Detailed Description
The structural features of the present invention will be described in further detail below with reference to the accompanying drawings and examples.
As shown in fig. 1 and 2, the utility model discloses an anchorage device for fixing carbon fiber bar includes first fixed block 1, slider 2, second fixed block 3, third fixed block 4, connecting plate 5 and pressure spring 6.
The first end of carbon fiber muscle 7 is held by first fixed block 1, and the second end of carbon fiber muscle 7 is held by slider 2. The first fixed block 1 is fixed at the first end of the reinforced building, and the second fixed block 3 is fixed at the second end of the reinforced building; a third fixed block 4 is fixed between the first fixed block 1 and the second fixed block 3; the connecting plate 5 penetrates through the sliding block 2 and is fixed between the second fixing block 3 and the third fixing block 4, and a pressure spring 6 is sleeved on the connecting plate 5 between the third fixing block 4 and the sliding block 2.
As shown in fig. 3, when reinforcing a reinforced building, a first fixing block 1 holding a carbon fiber bar 7 is fastened to a first end of the reinforced building; then, according to the lengths of the carbon fiber ribs 7 and the sliding block 2, the second fixing block 3 is fixed but not fastened at the second end of the reinforced building; the third fixing block 4 is fastened on the building between the first fixing block 1 and the second fixing block 3 according to the length of the connecting plate 5; clamping the second end of the carbon fiber bar 7 by the sliding block 2; the connecting plate 5 penetrates through the sliding block 2, and a pressure spring 6 is sleeved on the connecting plate 5 close to one end of the third fixing block 4; fixing a connecting plate 5 between the third fixing block 4 and the second fixing block 3; and finally, tightening the screw 9 by using a screw tensioner to fasten the second fixing block 2 on the reinforced building.
After the carbon fiber ribs 7 are tensioned by the prestress of the first fixing block 1 and the sliding block 2, the reinforced building is reinforced. Because the thermal expansion coefficients of the cement and the carbon fiber bars forming the building are different, in hot summer, when the environmental temperature is obviously raised, the thermal expansion of the cement forming the building is larger than that of the carbon fiber bars, the deformation of the building is larger than that of the carbon fiber bars, and the pressure spring 6 is lengthened; in cold winter, when the ambient temperature suddenly drops, the shrinkage of the cement constituting the building is larger than that of the carbon fiber bars, and the pressure spring 6 is compressed. Because the sliding block 2 clamping the second end of the carbon fiber bar 7 is not fixed but slides on the connecting plate 5, the invention compensates for the deformation difference of the building and the carbon fiber bar caused by different thermal expansion coefficients by the extension or compression of the pressure spring 6, overcomes the local deformation of the joint of the carbon fiber bar and the reinforced building, leads the carbon fiber bar and the reinforced building to be perfectly fused together, and fully exerts the physical characteristics of the carbon fiber bar.
The pressure F of the pressure spring is KX, wherein: k is a compression spring constant, X is (L is Δ C is 12) is 10E-6, L in the formula is the total length of the carbon fiber rib, and Δ C represents the difference between the lowest temperature in winter and the highest temperature in summer.
For centre gripping carbon fiber muscle 7, all opened blind hole 8 on first fixed block 1 and the slider 2, the degree of depth of blind hole 8 is 1% of carbon fiber muscle overall length. When the carbon fiber bar 7 is clamped, only the two ends of the carbon fiber bar 7 are required to be respectively inserted into the blind holes 8 of the first fixing block 1 and the sliding block 2. Because the axial strength of the carbon fiber bar 7 is high, the shearing strength is weak, if the inner diameter of the blind hole 8 is smaller than or equal to the diameter of the carbon fiber bar 7, the end part of the carbon fiber bar is forcibly inserted into the blind hole 8, the skin of the end part of the carbon fiber bar is damaged, and the characteristics of the carbon fiber bar are affected, so that the inner diameters of the blind holes 8 on the first fixing block 1 and the sliding block 2 are larger than the diameter of the carbon fiber bar 7 by 0.2-0.5 mm.
The first fixing block 1 may be a whole, or may be formed by fixing two plates by bolts, as shown in fig. 1 and 4, the first fixing block 1 is formed by fixing a first block 11 and a second block 12 by bolts 13. A semi-cylinder 14 is dug on the side wall of the first block 11 adjacent to the second block, the diameter of the semi-cylinder 14 is 0.2-0.5mm larger than that of the carbon fiber bar 7, and the depth is 1% of the total length of the carbon fiber bar. A semi-cylinder 15 is also dug on the side wall of the second block 12 adjacent to the first block 11, the diameter of the semi-cylinder 15 is 0.2-0.5mm larger than that of the carbon fiber bar 7, and the depth is 1% of the total length of the carbon fiber bar. When the first block 11 and the second block 12 are connected and fixed together through bolts, a gap of 1mm is reserved between the first block 11 and the second block 12, and the semi-cylinders 14 and 15 form a blind hole 8 for clamping and fixing the carbon fiber rib 7. When the carbon fiber bar 7 is clamped and fixed, the end part of the carbon fiber bar 7 is placed in the blind hole 8 formed by the semi-cylinders 14 and 15, and then the first block body 11 and the second block body 12 are fixed together through the bolt 13.
Further, the inner walls 16 of the semi-cylinders 14, 15 may be smooth or non-smooth, so as to minimize damage to the skins at the ends of the carbon fiber ribs 7 when the first block 11 and the second block 12 are fixed by the bolts 13.
Similarly, the slider 2 can be a whole, and also can be formed by two plates through bolt fastening, and two adjacent lateral walls of the block are respectively dug with a semi-cylinder with a diameter larger than that of the carbon fiber reinforcement 7 by 0.2-0.5mm and a depth of 1% of the total length of the carbon fiber reinforcement, when the two blocks are fastened through bolts, the two semi-cylinders form a blind hole 8 for clamping and fixing the carbon fiber reinforcement, and a gap of 1mm is reserved between the two blocks. Further, the inner wall of the semi-cylinder can be a smooth inner wall or a non-smooth inner wall.
Finally, it should be noted that: the above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (6)
1. An anchor for fixing carbon fiber bars, characterized in that: the device comprises a first fixed block, a sliding block, a second fixed block, a third fixed block, a connecting plate and a pressure spring;
the first end of the carbon fiber bar is clamped by the first fixing block, and the second end of the carbon fiber bar is clamped by the sliding block;
the first fixing block is fixed at the first end of the reinforced building, and the second fixing block is fixed at the second end of the reinforced building; the third fixed block is fixed between the first fixed block and the second fixed block;
the connecting plate penetrates through the sliding block and is fixed between the second fixing block and the third fixing block, and the pressure spring is sleeved on the connecting plate between the third fixing block and the sliding block.
2. An anchorage assembly for fixing a carbon fibre tendon as claimed in claim 1, wherein: the pressure F of the pressure spring is KX, wherein: k is a compression spring constant, X is (L is deltaC is 12) is 10E-6, L is the total length of the carbon fiber rib, and deltaC represents the difference between the lowest temperature in winter and the highest temperature in summer.
3. An anchorage for fixing a carbon fibre tendon as claimed in claim 2, wherein: blind holes are formed in the first fixing block and the sliding block, and the length of each blind hole is 1% of the total length of the carbon fiber ribs;
the inner diameter of the blind hole is 0.2-0.5mm larger than the diameter of the carbon fiber bar.
4. An anchorage for fixing a carbon fibre tendon as claimed in claim 3, wherein: the first fixing block is formed by fixing a first block body and a second block body through bolts; when the first block body and the second block body are connected and fixed together, a gap of 1mm is reserved between the first block body and the second block body;
the first block body and the second block body are respectively provided with a semi-cylinder which has a diameter which is 0.2-0.5mm larger than the diameter of the carbon fiber bar and a depth which is 1% of the total length of the carbon fiber bar on the adjacent side walls, and when the first block body and the second block body are fixed through bolts, the two semi-cylinders form the blind holes for clamping the carbon fiber bar.
5. An anchorage for fixing a carbon fibre tendon as claimed in claim 3 or claim 4, wherein: the sliding block is formed by fixing two block bodies through bolts, and a gap of 1mm is reserved between the two block bodies;
and when the two blocks are fixed through bolts, the two semi-cylinders form the blind holes for clamping the fixed carbon fiber bars.
6. An anchorage assembly for fixing a carbon fibre tendon as claimed in claim 5, wherein: the inner wall of the semi-cylinder is a smooth inner wall or a non-smooth inner wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021045307.0U CN212742214U (en) | 2020-06-09 | 2020-06-09 | Anchor for fixing carbon fiber bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021045307.0U CN212742214U (en) | 2020-06-09 | 2020-06-09 | Anchor for fixing carbon fiber bar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212742214U true CN212742214U (en) | 2021-03-19 |
Family
ID=75007296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021045307.0U Expired - Fee Related CN212742214U (en) | 2020-06-09 | 2020-06-09 | Anchor for fixing carbon fiber bar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212742214U (en) |
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2020
- 2020-06-09 CN CN202021045307.0U patent/CN212742214U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210319 |