CN210976338U - Secondary tension low-retraction prestressed anchorage - Google Patents
Secondary tension low-retraction prestressed anchorage Download PDFInfo
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- CN210976338U CN210976338U CN201921317634.4U CN201921317634U CN210976338U CN 210976338 U CN210976338 U CN 210976338U CN 201921317634 U CN201921317634 U CN 201921317634U CN 210976338 U CN210976338 U CN 210976338U
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- steel strand
- prestressed anchorage
- safety cover
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Abstract
The utility model discloses a secondary stretch-draw low prestressed anchorage utensil that contracts belongs to ground tackle technical field, has solved the prestressed anchorage utensil among the prior art and has contracted when the secondary stretch-draw returns that the volume of contracting is great and lead to the problem that prestressing loss is big, the utility model discloses a backing plate, the backing plate has connected gradually nut end, solid fixed ring and anchor cup, run through in the anchor cup and install steel strand wires, gu install the safety cover outside fixed ring and the anchor cup, the safety cover is connected with the nut end, is connected with the spring between steel strand wires tip in the safety cover and the safety cover inner wall. The utility model discloses utilize simple structure to realize that the low is contract and is contracted, showing and having reduced prestressing loss.
Description
Technical Field
The utility model belongs to the technical field of the ground tackle, concretely relates to secondary stretch-draw hangs back prestressing anchor utensil that contracts.
Background
The anchorage device is a permanent anchorage device used in prestressed concrete, is an anchorage tool which is used in post-tensioning structure or member for maintaining the tensile force of prestressed reinforcement and transferring the tensile force to the interior of concrete, and is also called as a prestressed anchorage device.
When a prestressed concrete member is manufactured, a reinforcement cage is bound, a reserved corrugated pipe pipeline and a bearing body base plate are arranged, then concrete is poured, when the strength of the concrete member meets the design requirement, a steel strand is penetrated in the reserved pipeline, an inner bearing body, an outer bearing body, a high-strength clamping body, a limiting plate, a jack, a tool anchor plate, a tool clamping piece and the like are installed on the member, the steel strand is stretched by utilizing the jack, the limiting plate, the tool anchor and the like, oil return and unloading are carried out after the tensile force reaches a control value, the steel strand rebounds, the high-strength clamping body is brought into a taper hole of the inner bearing body, so that the steel strand is clamped, but in the rebounding process of the steel strand, a gap of about 6mm is generated between the inner bearing body and the bearing body base plate (namely the steel strand generates 6mm retraction amount), then secondary tensioning is carried out, and the outer bearing body is abutted against, the oil return is unloaded after the tensile force reaches the design value.
In the existing prestressed anchorage device, a finish-rolled screw-thread steel nut is screwed only by manual operation in the prestressed construction process, so that uncertainty is brought to anchorage, and if the operation is improper, the prestressed loss is very serious; the twisted steel is rigid, cannot be completely vertical to the anchor backing plate during installation, has low strength and insufficient toughness, and can generate overlarge anchoring deformation loss; in a low-temperature environment, the stability of the anchorage device is greatly influenced by the performance of steel, so that the prestress is obviously lost, and the low-temperature resistance of the existing prestressed anchorage device is obviously insufficient.
During construction, the sleeve is screwed on the upper end of the anchor cup, secondary tensioning can be achieved through the jack, the retraction degree of the existing anchor cup is large and sometimes even exceeds 10%, and the low retraction is difficult to maintain due to the fact that the sleeve is quite inconvenient to tension and tighten the supporting nut during site construction.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a:
the secondary tension low-retraction prestressed anchorage is provided for solving the problem that the prestressed loss is large due to the large retraction amount of the prestressed anchorage in the prior art during secondary tension retraction.
The utility model adopts the technical scheme as follows:
secondary stretch-draw low back prestressing force anchor utensil that contracts, including the backing plate, the backing plate has connected gradually nut end, solid fixed ring and anchor cup, run through in the anchor cup and install steel strand wires, its characterized in that, gu fixed ring and anchor cup install the safety cover outward, the safety cover is connected with the nut end, is connected with the spring between steel strand wires tip in the safety cover and the safety cover inner wall.
Further, the protective cover is of a double-layer structure, and a vacuum layer is arranged between the inner layer and the outer layer of the protective cover.
Furthermore, a reinforcing frame is installed on the periphery of the base plate, an anchoring frame is connected to the reinforcing frame, the anchoring frame is composed of a plurality of fence-shaped supporting frames, stabilizing ribs are connected between the supporting frames, and reinforcing beam rings are further installed in the fixing rings.
Furthermore, a prestress retaining device is installed at the other end, far away from the anchor cup, of the steel strand, the prestress retaining device comprises an end cover installed at the end of the steel strand, and a tensioning nut is installed on the steel strand in the end cover.
Furthermore, a clamping ring is further installed between the tensioning nut and the steel strand, and threads matched with the tensioning nut are arranged on the outer surface of the clamping ring.
Furthermore, the surface of the steel strand is covered with a waterproof layer, and the waterproof layer is composed of an HDPE protective layer.
The working principle of the utility model is as follows:
the utility model discloses a low prestressing force anchor utensil that contracts carries out the position relatively fixed to the safety cover and the ground tackle that do not connect earlier when carrying out stretch-draw, then connect safety cover and ground tackle through the spring, make the spring be in tensile state, guarantee that it has sufficient pulling force, then contract back to steel strand wires again and make its clamp clamping piece, the spring can provide the pulling force effect to the resilience force of steel strand wires this moment and make the volume of contracting reduce, carry out work such as tightening of back nut again, thereby make the prestressing force loss show the reduction, the spring that uses here is high strength spring.
The utility model discloses a prestressed anchorage utensil is through installing additional on the backing plate and strengthening frame and anchor frame, makes the intensity after the ground tackle installation obtain showing and promotes, and the safety cover can completely cut off certain debris and corrode and high low temperature influence to guarantee that the intensity of ground tackle can not descend, keep high strength and high tenacity always, the utility model discloses creatively designed the structure of two stretch-draw of steel strand wires, made the prestressing force further improve, the at utmost has exerted the intensity and the toughness of material.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. the arrangement of the spring provides tension for the steel strand, so that the tension action is exerted on the steel strand in the retraction process of secondary tensioning to obviously reduce the retraction amount, the loss of prestress is effectively prevented, the construction of operators is facilitated, the structure is simple, the operation is convenient, the extra cost can be almost ignored, and the effect is obvious in actual use; the utility model discloses a safety cover can completely cut off the impurity erosion and the high low temperature infringement of ground tackle surrounding environment, thereby prevent that the material of ground tackle from losing prestressing force or even ground tackle damage because of reasons such as corruption, improved the security.
2. The utility model discloses a safety cover vacuum sandwich structure can effectively completely cut off outside high temperature and low temperature, prevents that material stress limit from changing and producing to warp even damage under the high low temperature environment, has promoted the stability and the life of device.
3. The utility model discloses an installation reinforcement frame, reinforcement frame are gone up to installation anchor frame on the backing plate, have promoted the intensity of prestressed anchorage utensil effectively, and the support frame of paliform makes the atress of backing plate disperse more, thereby has effectively avoided the backing plate material to reach stress limit deformation under the prestressing force, has both guaranteed intensity, has avoided the ground tackle to damage again, and strengthens the bundle ring and can further promote the pulling force of ground tackle to steel strand wires, improves stability.
4. The utility model discloses a prestressing force holding device makes steel strand wires both sides all by stretch-draw, and the opposite side uses tensioning nut, with the prestressing force dispersion to both sides that the ground tackle bore, has reduced the prestressing force that the ground tackle received, also enables the adjustable upper limit increase of prestressing force simultaneously, makes the service condition of ground tackle more nimble, can exert intensity and toughness of each part material to bigger degree.
5. The utility model discloses a grip ring can protect the steel strand wires surface, avoids the screw thread of nut to destroy the steel strand wires, also has the clamping action to the steel strand wires simultaneously, makes it keep certain pulling force prestressing force, makes the structure more reasonable.
6. The utility model discloses a HDPE protective layer can protect the steel strand wires not corroded by moisture, avoids it to take place the condition such as corrosion and reduces material strength, prevents loss prestressing force.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a block diagram of the present invention;
fig. 2 is a side view of the pallet of fig. 1.
Description of reference numerals:
1-steel strand, 2-anchor cup, 3-fixing ring, 4-nut end, 5-backing plate, 6-spiral rib, 7-spring, 8-protective cover, 9-protective layer, 10-prestress holding device, 11-end cover, 12-tensioning nut, 13-reinforcing beam ring, 14-reinforcing frame and 15-anchor frame.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
The present invention will be described in detail with reference to fig. 1 and 2.
Example 1
The embodiment as a basis:
secondary stretch-draw low-retraction prestressed anchorage device comprises a base plate 5, wherein the base plate 5 is sequentially connected with a nut end 4, a fixing ring 3 and an anchor cup 2, a steel strand 1 penetrates through the anchor cup 2, and the secondary stretch-draw low-retraction prestressed anchorage device is characterized in that a protection cover 8 is arranged outside the fixing ring 3 and the anchor cup 2, the protection cover 8 is connected with the nut end 4, and a spring 7 is connected between the end part of the steel strand 1 in the protection cover 8 and the inner wall of the protection cover 8.
The arrangement of the spring 7 of the utility model provides a pulling force for the steel strand 1, so that the steel strand 1 is pulled by the force in the retraction process of the secondary tensioning to obviously reduce the retraction amount, thereby effectively preventing the loss of prestress, facilitating the construction of operators, having simple structure and convenient operation, almost neglecting the extra cost, and having obvious effect in practical use; the utility model discloses a safety cover 8 can completely cut off the impurity erosion and the high low temperature infringement of ground tackle surrounding environment, thereby prevent that the material of ground tackle from losing prestressing force or even ground tackle damage because of reasons such as corruption, improved the security.
Example 2
In this embodiment, the focus is on the improvement compared with the above embodiment, and the same parts are not described again, in this embodiment, the protection cover 8 is a double-layer structure, and a vacuum layer is disposed between the inner layer and the outer layer of the protection cover 8. The utility model discloses a 8 vacuum sandwich structure of safety cover can effectively completely cut off outside high temperature and low temperature, prevents that material stress limit from changing and producing to warp even damage under the high low temperature environment, has promoted the stability and the life of device.
Example 3
In this embodiment, a reinforcing frame 14 is installed on the periphery of the backing plate 5, an anchoring frame 15 is connected to the reinforcing frame 14, the anchoring frame 15 is composed of a plurality of fence-shaped supporting frames, stabilizing ribs are connected between the supporting frames, and a reinforcing binding ring 13 is installed in the fixing ring 3. The utility model discloses an installation anchor frame 15 on installation strengthening frame 14, strengthening frame 14 on backing plate 5 has promoted the intensity of prestressed anchorage utensil effectively, and the support frame of paliform makes backing plate 5's atress disperse more, thereby has effectively avoided backing plate 5 material to reach the stress limit under the prestressing force and warp, has both guaranteed intensity, has avoided the ground tackle to damage again, and strengthens the pulling force that the collar 13 can further promote ground tackle to steel strand wires 1, improves stability.
Example 4
In this embodiment, a prestress holding device 10 is installed at the other end of the steel strand 1 away from the anchor cup 2, the prestress holding device 10 includes an end cover 11 installed at the end of the steel strand 1, a tensioning nut 12 is installed on the steel strand 1 in the end cover 11, a clamping ring is further installed between the tensioning nut 12 and the steel strand 1, a thread matched with the tensioning nut 12 is arranged on the outer surface of the clamping ring, a waterproof layer is installed on the surface of the steel strand 1 in a covering manner, and the waterproof layer is composed of an HDPE protective layer 9.
The utility model discloses a prestressing force retaining device 10 makes 1 both sides of steel strand wires all by stretch-draw, and the opposite side uses tensioning nut 12, with the prestressing force dispersion to both sides that the ground tackle bore, has reduced the prestressing force that the ground tackle received, also enables the adjustable upper limit of prestressing force to increase simultaneously, makes the service condition of ground tackle more nimble, can exert intensity and the toughness of each part material to a bigger degree. The clamping ring can protect the surface of the steel strand 1, the steel strand 1 is prevented from being damaged by the threads of the nut, and the steel strand 1 is clamped by the clamping ring, so that certain tension prestress is kept, and the structure is more reasonable. The HDPE protective layer 9 can protect the steel strand 1 from being corroded by water, prevent the steel strand from being corroded, reduce the strength of the material and prevent the loss of prestress.
Claims (6)
1. Secondary stretch-draw low prestressed anchorage utensil that contracts, including backing plate (5), backing plate (5) have connected gradually nut end (4), solid fixed ring (3) and anchor cup (2), run through in anchor cup (2) and install steel strand wires (1), its characterized in that, gu fixed ring (3) and anchor cup (2) install safety cover (8) outward, safety cover (8) are connected with nut end (4), are connected with spring (7) between steel strand wires (1) tip in safety cover (8) and safety cover (8) inner wall.
2. The secondary tension low-retraction prestressed anchorage of claim 1, characterized in that the protective cover (8) is a double-layer structure, and a vacuum layer is arranged between the inner layer and the outer layer of the protective cover (8).
3. The secondary tensioning low-retraction prestressed anchorage device according to claim 1, wherein a reinforcing frame (14) is installed on the periphery of the base plate (5), an anchoring frame (15) is connected to the reinforcing frame (14), the anchoring frame (15) is composed of a plurality of fence-shaped supporting frames, stabilizing ribs are connected between the supporting frames, and a reinforcing binding ring (13) is installed in the fixing ring (3).
4. The secondary-tensioning low-retraction prestressed anchorage device according to claim 1, wherein the other end of the steel strand (1) far away from the anchor cup (2) is provided with a prestress retaining device (10), the prestress retaining device (10) comprises an end cover (11) arranged at the end of the steel strand (1), and a tensioning nut (12) is arranged on the steel strand (1) in the end cover (11).
5. The secondary tensioning low-retraction prestressed anchorage device according to claim 4, wherein a clamping ring is further installed between the tensioning nut (12) and the steel strand (1), and the outer surface of the clamping ring is provided with threads matched with the tensioning nut (12).
6. The secondary tensioning low-retraction prestressed anchorage of claim 1, wherein the surface of the steel strand (1) is covered and installed with a waterproof layer, and the waterproof layer is composed of an HDPE protective layer (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921317634.4U CN210976338U (en) | 2019-08-14 | 2019-08-14 | Secondary tension low-retraction prestressed anchorage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921317634.4U CN210976338U (en) | 2019-08-14 | 2019-08-14 | Secondary tension low-retraction prestressed anchorage |
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| CN210976338U true CN210976338U (en) | 2020-07-10 |
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| CN201921317634.4U Active CN210976338U (en) | 2019-08-14 | 2019-08-14 | Secondary tension low-retraction prestressed anchorage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113417807A (en) * | 2021-07-07 | 2021-09-21 | 重庆大学 | Wind turbine generator system concrete tower section of thick bamboo prestressing force steel strand end protection device |
| CN116263053A (en) * | 2021-12-14 | 2023-06-16 | 中国五冶集团有限公司 | Vacuum suction type anti-floating anchor rod |
-
2019
- 2019-08-14 CN CN201921317634.4U patent/CN210976338U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113417807A (en) * | 2021-07-07 | 2021-09-21 | 重庆大学 | Wind turbine generator system concrete tower section of thick bamboo prestressing force steel strand end protection device |
| CN116263053A (en) * | 2021-12-14 | 2023-06-16 | 中国五冶集团有限公司 | Vacuum suction type anti-floating anchor rod |
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