CN219952744U - Prestressing force carbon fiber tendon stretching device based on one-way SMA - Google Patents
Prestressing force carbon fiber tendon stretching device based on one-way SMA Download PDFInfo
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- CN219952744U CN219952744U CN202321657573.2U CN202321657573U CN219952744U CN 219952744 U CN219952744 U CN 219952744U CN 202321657573 U CN202321657573 U CN 202321657573U CN 219952744 U CN219952744 U CN 219952744U
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- carbon fiber
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- anchor
- way sma
- sma
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- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 49
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 49
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 210000002435 tendon Anatomy 0.000 title claims description 15
- 239000000126 substance Substances 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 230000003446 memory effect Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004918 carbon fiber reinforced polymer Substances 0.000 description 1
- 238000004210 cathodic protection Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
Abstract
The utility model provides a prestress carbon fiber reinforcement tensioning device based on one-way SMA, which comprises carbon fiber reinforcement, anchors connected to two ends of the carbon fiber reinforcement and anchors connected to the anchors; in the two anchors, at least one of the two anchors is a tension end anchor, and correspondingly, at least one anchor is a tension end anchor, and the tension end anchor is connected with the tension end anchor through a one-way SMA screw. By adopting the technical scheme, the prestress carbon fiber reinforcement tensioning device based on the one-way SMA adopts the one-way SMA screw to generate prestress to complete tensioning, so that the problems of slotting and eccentricity caused by jack tensioning can be avoided, the requirement on space in the tensioning process is greatly reduced, and the applicability of an anchor is expanded.
Description
Technical Field
The utility model relates to a prestressed carbon fiber bar tensioning device based on one-way SMA, and belongs to the technical field of construction engineering.
Background
Traditional civil engineering often adopts steel strand wires as the reinforcement, but steel as the metal material, the emergence of metal corrosion phenomenon can't be avoided, corrodes and cause the cross-section loss, leads to the bearing capacity to descend, causes the hidden danger to structure safety. In order to solve the problem, researchers have adopted methods such as surface brushing and cathodic protection, but the corrosion of steel cannot be essentially avoided. Carbon fiber materials have good corrosion resistance and have found increasing use in recent years. The prestress carbon fiber plate reinforcement is outstanding in virtue of the advantages of active reinforcement, good corrosion resistance and the like, and becomes a new favor of external prestress reinforcement. However, the prestressed carbon fiber plate has the characteristics of larger size of the corresponding anchorage device, complicated tensioning process, poor out-of-plane bearing capacity of the carbon fiber plate which is a planar material, and the like, and also limits the application of the carbon fiber plate. The carbon fiber bar has better lateral force resistance due to the round section, and the carbon fiber bar anchorage device can be light, so that more and more attention is paid. At present, the traditional tensioning mode is still completed by externally adding a jack, but the jack is large in volume, when tensioning is performed, if grooving and installation are performed on a concrete structure body, the original structure is damaged, and if grooving is not performed, the eccentric condition exists in the tensioning process, so that the tensioning effect is affected. Based on the above, a novel tensioning mode is needed to avoid the problem caused by jack tensioning.
The shape memory alloy (ShapedMemoryAlloy, SMA) has shape memory effect and super elasticity, can provide prestress, and adopts SMA as a reinforcing material in engineering practice in the existing project, but the SMA material has high price and high use cost, and is not beneficial to wide application in engineering. It is therefore more cost-effective to use SMA as an auxiliary material in the prestressing reinforcement. SMA can be classified into one-way memory effect (shape memory alloy deforms at a lower temperature, and returns to its original shape after heating), two-way memory effect (returns to its high-temperature phase shape when heating, and returns to its low-temperature phase shape when cooling), and full-way memory effect (returns to its high-temperature phase shape when heating, and returns to its low-temperature phase shape when cooling, which is the same shape but opposite in orientation). The iron-based shape memory alloy (Fe-SMA) with the one-way memory effect has lower price, can generate prestress on the premise of tensioning-free engineering site, and is more suitable for engineering projects.
Disclosure of Invention
Therefore, the utility model aims to provide the prestress carbon fiber rib tensioning device based on the one-way SMA, which can realize tensioning of the carbon fiber rib by replacing a jack with the one-way SMA.
In order to achieve the above purpose, the prestress carbon fiber rib tensioning device based on one-way SMA comprises carbon fiber ribs, anchors connected to two ends of the carbon fiber ribs and anchor seats connected to the anchors; in the two anchors, at least one of the two anchors is a tension end anchor, and correspondingly, at least one anchor is a tension end anchor, and the tension end anchor is connected with the tension end anchor through a one-way SMA screw.
The stretching end anchor seat comprises a base plate part and a baffle plate part, wherein the base plate part is used for being fixed on the surface of a building structure, a through hole is formed in the baffle plate part, and the one-way SMA screw rod passes through the through hole and is then screwed with a nut.
One end of the one-way SMA screw is fixed to the adapter sleeve, the tension end anchor comprises an outer barrel and a wedge-shaped piece inserted into the outer barrel, the wedge-shaped piece is clamped at one end of the carbon fiber rib, and the end of the outer barrel is in threaded connection with the adapter sleeve.
The adapter sleeve is integrally formed with the one-way SMA screw rod or is fixedly connected with the one-way SMA screw rod in a threaded manner.
The outer surface of the wedge-shaped piece is conical, a plurality of through grooves are formed in the side wall of the wedge-shaped piece, the side wall of the wedge-shaped piece is divided into a plurality of clamping parts by the through grooves, and the carbon fiber ribs are clamped by the clamping parts.
The one-way SMA is Fe-SMA.
The two anchors are tension end anchors, and the two anchors are tension end anchors.
One of the two anchors is a fixed end anchor, and correspondingly, one of the two anchors is a fixed end anchor; the fixed end anchor is connected to the fixed end anchor through a fixed end screw rod.
The anchor seat is fixed on the surface of the building structure through a chemical anchor bolt.
By adopting the technical scheme, the prestress carbon fiber rib tensioning device based on the one-way SMA has the following beneficial effects compared with the prior art:
1. the one-way SMA screw is adopted to generate prestress to complete tensioning, so that the problems of slotting and eccentricity caused by jack tensioning can be avoided, the requirement on space in the tensioning process is greatly reduced, and the applicability of the anchor is expanded.
2. The one-way SMA screw is adopted to generate prestress, so that a plurality of tensioning devices can simultaneously tension a plurality of carbon fiber ribs, and the problem of different tensioning effects caused by different tensioning sequences when the plurality of carbon fiber ribs are tensioned is avoided.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Fig. 2 is an exploded schematic view of a tensioned end structure.
Fig. 3 is another angular schematic view of fig. 2.
Fig. 4 is a schematic view of the carbon fiber tendon after being attached to the tension end anchor.
Fig. 5 is a schematic view of a one-way SMA screw attached to a tension end anchor.
Detailed Description
The utility model is described in further detail below with reference to the drawings and the detailed description.
As shown in fig. 1-5, the present embodiment provides a prestressed carbon fiber tendon tensioning device based on one-way SMA, which includes a carbon fiber tendon 1, anchors connected to both ends of the carbon fiber tendon 1, and anchors connected to the anchors. Of the two described anchors, one is a tension end anchor 2 and the other is a fixed end anchor 3. Correspondingly, the two anchors are a tensioning end anchor 4 and a fixed end anchor 5 respectively.
The anchor comprises a base plate part 6 and a baffle plate part 7, wherein the base plate part 6 is fixed on the surface of a building structure through a chemical anchor bolt, and a through hole 8 is formed in the baffle plate part 7.
The tensioning end anchor 2 is connected to the tensioning end anchor 4 through a one-way SMA screw 9. Specifically, one end of the one-way SMA screw 9 is fixed to the adapter sleeve 10, the tension end anchor 2 includes an outer cylinder 21 and a wedge 22 inserted into the outer cylinder 21, the wedge 22 is clamped at one end of the carbon fiber reinforced plastic 1, and the end of the outer cylinder 21 is screwed into the adapter sleeve 10. The outer surface of the wedge 22 is conical, a plurality of through grooves 221 are formed in the side wall of the wedge 22, the through grooves 221 divide the side wall of the wedge 22 into a plurality of clamping portions, and the carbon fiber ribs 1 are clamped by the clamping portions. The one-way SMA screw 9 passes through the through hole 8 on the tensioning end anchor seat 4 and is then screwed with a tensioning nut 11.
The fixed end anchor 3 is connected to the fixed end anchor 5 through a fixed end screw 12.
In this embodiment, preferably, the one-way SMA is Fe-SMA.
During construction, firstly, positioning and paying off according to design requirements, processing a base layer, installing anchor seats at two ends after finishing, and fixing by using a chemical anchor bolt; then one end of the adapter sleeve is connected with the carbon rib anchorage device, the other end of the adapter sleeve is connected with the screw rod, and the screw rod passes through the through hole on the anchorage device and is then screwed on the nut; after the protective measures are taken, the Fe-SMA screw is electrified and excited, and the temperature of the Fe-SMA screw is raised after the Fe-SMA screw is electrified, so that the shrinkage is carried out, and the tensioning work of the carbon fiber ribs is completed.
The technical scheme of the utility model is as follows:
compared with an external steel strand reinforcing mode, the prestressed carbon fiber cable can effectively avoid the problem of bearing capacity reduction caused by steel corrosion.
Compared with the reinforcement mode of the prestressed carbon fiber plate, the anchor frame of the prestressed carbon fiber bar 1 is lighter, saves space and expands applicability.
Compared with a prestressed carbon fiber reinforced anchoring device tensioned by a jack, the problem caused by jack tensioning can be further avoided, and the applicability is further enlarged. And the Fe-SMA is adopted to generate prestress in a power-on excitation mode, so that a plurality of carbon fiber ribs can be stretched simultaneously, and the problem of different stretching effects caused by different stretching sequences when the plurality of carbon fiber ribs are stretched is solved.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.
Claims (9)
1. A prestressing force carbon fiber tendon stretching device based on one-way SMA, its characterized in that: comprises carbon fiber ribs, anchors connected to two ends of the carbon fiber ribs and anchor seats connected to the anchors; in the two anchors, at least one of the two anchors is a tension end anchor, and correspondingly, at least one anchor is a tension end anchor, and the tension end anchor is connected with the tension end anchor through a one-way SMA screw.
2. The one-way SMA-based pre-stressed carbon fiber tendon tensioning apparatus of claim 1, wherein: the stretching end anchor seat comprises a base plate part and a baffle plate part, wherein the base plate part is used for being fixed on the surface of a building structure, a through hole is formed in the baffle plate part, and the one-way SMA screw rod passes through the through hole and is then screwed with a nut.
3. The one-way SMA-based pre-stressed carbon fiber tendon tensioning apparatus of claim 2, wherein: one end of the one-way SMA screw is fixed to the adapter sleeve, the tension end anchor comprises an outer barrel and a wedge-shaped piece inserted into the outer barrel, the wedge-shaped piece is clamped at one end of the carbon fiber rib, and the end of the outer barrel is in threaded connection with the adapter sleeve.
4. A one-way SMA-based pre-stressed carbon fiber tendon tensioning apparatus as set forth in claim 3, wherein: the adapter sleeve is integrally formed with the one-way SMA screw rod or is fixedly connected with the one-way SMA screw rod in a threaded manner.
5. A one-way SMA-based pre-stressed carbon fiber tendon tensioning apparatus as set forth in claim 3, wherein: the outer surface of the wedge-shaped piece is conical, a plurality of through grooves are formed in the side wall of the wedge-shaped piece, the side wall of the wedge-shaped piece is divided into a plurality of clamping parts by the through grooves, and the carbon fiber ribs are clamped by the clamping parts.
6. A one-way SMA-based pre-stressed carbon fiber tendon tensioning apparatus as set forth in any one of claims 1-5, wherein: the one-way SMA is Fe-SMA.
7. A one-way SMA-based pre-stressed carbon fiber tendon tensioning apparatus as set forth in any one of claims 1-5, wherein: the two anchors are tension end anchors, and the two anchors are tension end anchors.
8. A one-way SMA-based pre-stressed carbon fiber tendon tensioning apparatus as set forth in any one of claims 1-5, wherein: one of the two anchors is a fixed end anchor, and correspondingly, one of the two anchors is a fixed end anchor; the fixed end anchor is connected to the fixed end anchor through a fixed end screw rod.
9. A one-way SMA-based pre-stressed carbon fiber tendon tensioning apparatus as set forth in any one of claims 1-5, wherein: the anchor seat is fixed on the surface of the building structure through a chemical anchor bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321657573.2U CN219952744U (en) | 2023-06-27 | 2023-06-27 | Prestressing force carbon fiber tendon stretching device based on one-way SMA |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321657573.2U CN219952744U (en) | 2023-06-27 | 2023-06-27 | Prestressing force carbon fiber tendon stretching device based on one-way SMA |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219952744U true CN219952744U (en) | 2023-11-03 |
Family
ID=88549192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321657573.2U Active CN219952744U (en) | 2023-06-27 | 2023-06-27 | Prestressing force carbon fiber tendon stretching device based on one-way SMA |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219952744U (en) |
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2023
- 2023-06-27 CN CN202321657573.2U patent/CN219952744U/en active Active
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