Prestressed anchorage device of steel strand and prestressed concrete structure

Abstract

The utility model discloses a prestressed anchorage device of steel strand and prestressed concrete structure, relate to prestressed structure technical field, the prestressed anchorage device of steel strand includes anchorage device, adjusting sleeve, anchor backing plate and U-shaped frame, be equipped with the anchor eye that the steel strand passes through in the anchorage device, the anchor eye is movably inserted with the clamp, and the U-shaped frame is equipped with the anchor backing plate. The clamp is provided with a clamping hole for the steel strand to penetrate through, the clamping hole is communicated with the anchor hole, and the clamp can clamp the steel strand penetrating through the clamping hole. The adjusting sleeve is arranged outside the anchorage device in a sleeving mode and can move relative to the anchorage device. A through hole for the steel strand to penetrate through is formed in the anchor backing plate, and the adjusting sleeve abuts against the anchor backing plate; the U-shaped frame is arranged outside the anchorage device and the adjusting sleeve in a covering mode, the end of the U-shaped frame abuts against the anchor bearing plate, a through hole allowing the steel strand to penetrate through is formed in the U-shaped frame, and an abutting table used for abutting against an external jack is formed on the side, away from the anchorage device, of the U-shaped frame. The tensioning and releasing operation of the steel strand is simple, and the releasing process is slow, so that the damage to the component in the releasing process is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of prestressed structures, in particular to prestressed anchorage equipment for steel strands and a prestressed concrete structure. Background Art

[0002] Prestressed concrete structure is a structure that has pressure applied to it before it bears the load. This causes the internal force of the concrete in the tension zone to produce compressive stress when the external load acts. This is used to offset or reduce the tensile stress caused by the external load, so that the structure will not crack or will crack later under normal use.

[0003] Some prestressed concrete structures bury steel strands inside and apply prestress to the concrete structure by tensioning the steel strands. The tensioning quality of the steel strands is particularly important for the effective use of the prestressing advantages. In order to ensure that the prestressing on the steel strands reaches the controlled stress, the actual operation of the project generally requires multiple tensioning in steps, and the construction steps are relatively cumbersome, especially for prestressed concrete with prestressing method. After the concrete reaches the designed strength, it is more troublesome to release the prestressed tendons. The direct cutting method is very dangerous in operation. The components will move greatly at the moment of cutting the prestressed tendons, and the components are also easily damaged. Utility Model Content

[0004] The main purpose of the utility model is to propose a prestressed anchor device for steel strands and a prestressed concrete structure, aiming to solve the technical problems in the prior art that the tensioning and release construction steps of the steel strands of the prestressed concrete structure are complicated, and the direct cutting method for release easily causes damage to the components.

[0005] To achieve the above-mentioned purpose, the prestressed anchor device of the steel strand proposed by the utility model comprises: an anchor, an adjusting sleeve, an anchor pad and a U-shaped frame, the anchor is in the shape of a cylinder, an anchor hole for the steel strand to pass through is opened in the anchor, a clamp is movably inserted in the anchor hole, a clamp hole is opened on the clamp for the steel strand to pass through is opened, the clamp hole is connected with the anchor hole, and the clamp can clamp the steel strand passing through the clamp hole; the adjusting sleeve is sleeved outside the anchor, and the adjusting sleeve can move relative to the anchor along the extension direction of the steel strand; a through hole is opened on the anchor pad for the steel strand to pass through, and the adjusting sleeve abuts against the anchor pad; the U-shaped frame cover is arranged outside the anchor and the adjusting sleeve, the end of the U-shaped frame abuts against the anchor pad, the U-shaped frame is provided with a through hole for the steel strand to pass through, and the side of the U-shaped frame away from the anchor forms an abutment platform for abutment of an external jack.

[0006] In one embodiment, a first thread is formed on the outer wall of the anchor, and a second thread matching the first thread is formed on the inner wall of the adjustment sleeve.

[0007] In one embodiment, the anchor hole includes a tapered section and a cylindrical section. The smaller-diameter end of the tapered section is connected to the cylindrical section, and the fixture is tapered and matches the shape of the tapered section.

[0008] In one embodiment, the fixture is composed of a plurality of clamping pieces that are joined together circumferentially, and the plurality of clamping pieces jointly clamp the steel strand.

[0009] In one embodiment, the fixture is composed of two clamping pieces that are joined together circumferentially.

[0010] In one embodiment, a biting groove is formed on the hole wall of the clamping hole.

[0011] In one embodiment, a buffer pad is provided between the anchor backing plate and the adjusting sleeve.

[0012] In one embodiment, a pressure sensor is installed between the anchor backing plate and the adjusting sleeve.

[0013] In one embodiment, the length of the adjusting sleeve is greater than or equal to the length of the anchor.

[0014] The present utility model also proposes a prestressed concrete structure to which the prestressing anchor device for the steel strand described above is applied.

[0015] For the prestressing anchor device for the steel strand and the prestressed concrete structure proposed by the present utility model, by sleeving an adjusting sleeve outside the anchor, the anchor is connected to the adjusting sleeve and can move relative to the adjusting sleeve. When the external jack tensiones the steel strand, by reducing the connection length between the anchor and the adjusting sleeve and making the adjusting sleeve abut against the anchor backing plate, prestress can be applied to the steel strand; when the external jack tensiones the steel strand, the adjusting sleeve disengages from the anchor backing plate. By increasing the connection length between the anchor and the adjusting sleeve and then gradually loosening the steel strand by adjusting the fixture, the prestress on the steel strand can be applied to the concrete structure connected to the steel strand. The tensioning and relaxation operations of the steel strand are made simpler by the prestressing anchor device for the steel strand proposed by the present utility model, and the steel strand can be gradually relaxed, and the relaxation process is relatively slow, thereby avoiding damage to the component during the relaxation process of the steel strand and effectively protecting the prestressed concrete structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0017] Figure 1 Schematic diagram of the structure of an embodiment of the prestressed anchor for steel strands provided by the present utility model;

[0018] Figure 2 Schematic diagram of the structure of an embodiment of the anchor of the prestressed anchor for steel strands provided by the present utility model;

[0019] Figure 3 Schematic diagram of the structure of an embodiment of the adjusting sleeve of the prestressed anchor for steel strands provided by the present utility model.

[0020] Explanation of the reference numerals in the drawings:

[0021] 10. Anchor; 11. Anchor hole; 111. Tapered section; 112. Cylindrical section; 12. Clamp; 121. Clamping hole; 13. First thread; 20. Adjusting sleeve; 21. Second thread; 30. Anchor backing plate; 40. U-shaped frame; 41. Contact platform; 50. Steel strand; 60. Jack.

[0022] The realization, functional features and advantages of the object of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0024] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0025] In addition, if the descriptions such as "first", "second", etc. are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0026] In the present utility model, the descriptions of directions such as "left" and "right" are based on Figure 1 the directions shown, and are only used to explain the relative positional relationship between the components in Figure 1 the posture shown. If this specific posture changes, the directional indication will also change accordingly.

[0027] In some existing partially prestressed concrete structures, steel strands are buried inside, and prestress is applied to the concrete structure by tensioning the steel strands. To ensure that the prestress tension on the steel strands reaches the control stress, generally, multiple tensionings are carried out step by step, and the construction steps are rather cumbersome. Especially for pretensioned prestressed concrete, after the concrete reaches the design strength, the relaxation of the prestressed tendons is even more troublesome. The method of directly cutting has great danger in operation. The components will move greatly at the moment when the prestressed tendons are cut, and the components are also prone to damage.

[0028] The present utility model provides a prestressed anchor device for steel strands, including an anchor 10, an adjusting sleeve 20, an anchor backing plate 30, and a U-shaped frame 40. The anchor 10 is cylindrical, and an anchor hole 11 for the steel strand 50 to pass through is provided inside the anchor 10. A clamp 12 is movably inserted into the anchor hole 11. A clamping hole 121 for the steel strand 50 to pass through is provided on the clamp 12, and the clamping hole 121 communicates with the anchor hole 11. The clamp 12 can clamp the steel strand 50 passing through the clamping hole 121; the adjusting sleeve 20 is sleeved outside the anchor 10, and the adjusting sleeve 20 can move relative to the anchor 10 along the extending direction of the steel strand 50; a through hole for the steel strand 50 to pass through is provided on the anchor backing plate 30, and the adjusting sleeve 20 abuts against the anchor backing plate 30; the U-shaped frame 40 covers the anchor 10 and the adjusting sleeve 20, the end of the U-shaped frame 40 abuts against the anchor backing plate 30, a through hole for the steel strand 50 to pass through is provided on the U-shaped frame 40, and a contact platform 41 for an external jack 60 to abut against is formed on the side of the U-shaped frame 40 facing away from the anchor 10.

[0029] Please refer toFigure 1 The steel strand 50 extends in the left - right direction, and the steel strand 50 passes through the U - shaped frame 40, the anchor 10, the adjusting sleeve 20, and the anchor backing plate 30 from left to right in sequence. The anchor 10 is sleeved outside the clamp 12, the adjusting sleeve 20 is sleeved outside the anchor 10, and the adjusting sleeve 20 can be fixed with the anchor 10 or can move relative to the anchor 10 in the left - right direction. The U - shaped frame 40 and the anchor backing plate 30 enclose each other to cover the anchor 10 and the adjusting sleeve 20 inside. A butting platform 41 for the external jack 60 to butt against is formed on the left side of the U - shaped frame 40. By setting the U - shaped frame 40, it is convenient for the jack 60 to perform the pushing operation. The left end of the steel strand 50 is connected to the external jack 60, and the right end of the steel strand 50 passes through the anchor backing plate 30 and is connected to the external concrete structure.

[0030] Before the concrete structure at the right end of the steel strand 50 is poured, the jack 60 drives the steel strand 50 to move leftward by pushing the butting platform 41, so as to tension the steel strand 50 through the jack 60. After the tensioning is completed, keep the clamp 12 clamping the steel strand 50, move the anchor 10 relative to the adjusting sleeve 20 to the leftmost side and then keep the anchor 10 and the adjusting sleeve 20 fixedly connected. Then jointly adjust the positions of the anchor 10 and the adjusting sleeve 20 on the steel strand 50 so that the right end of the adjusting sleeve 20 abuts against the anchor backing plate 30. The adjusting sleeve 20 keeps the steel strand 50 fixed through the anchor 10 and the clamp 12, so as to continuously apply prestress to the steel strand 50 and complete the tensioning of the prestress of the steel strand 50. After the concrete structure is poured, tension the steel strand 50 through the jack 60 to separate the adjusting sleeve 20 from the anchor backing plate 30, then move the anchor 10 relative to the adjusting sleeve 20 to the rightmost side, and then adjust the clamp 12 to gradually loosen the steel strand 50, and the relaxation of the prestress of the steel strand 50 can be completed. In addition, by adjusting the movement of the anchor 10 relative to the adjusting sleeve 20, the anchor 10 drives the steel strand 50 to move in the left - right direction through the clamp 12, and the prestress on the steel strand 50 can be finely adjusted.

[0031] The prestressed anchor device for steel strands proposed by the present utility model is provided with an adjusting sleeve 20 sleeved outside the anchor 10. The anchor 10 is connected to the adjusting sleeve 20 and can move relative to the adjusting sleeve 20. When the external jack 60 tensions the steel strand 50, by reducing the connection length between the anchor 10 and the adjusting sleeve 20 and making the adjusting sleeve 20 abut against the anchor backing plate 30, prestress can be applied to the steel strand 50. When the external jack 60 tensions the steel strand 50, the adjusting sleeve 20 disengages from the anchor backing plate 30. By increasing the connection length between the anchor 10 and the adjusting sleeve 20 and then gradually loosening the steel strand 50 by adjusting the clamp 12, the prestress on the steel strand 50 can be applied to the concrete structure connected to the steel strand 50. With the prestressed anchor device for steel strands proposed by the present utility model, the tensioning and relaxation operations of the steel strand 50 are made simpler. The steel strand 50 can be gradually relaxed, and the relaxation process is relatively slow, thus avoiding damage to the components during the relaxation process of the steel strand 50 and effectively protecting the prestressed concrete structure.

[0032] In one embodiment, a first thread 13 is provided on the outer sidewall of the anchor 10, and a second thread 21 that mates with the first thread 13 is provided on the inner wall of the adjusting sleeve 20.

[0033] Please refer to Figure 2 and Figure 3 , the adjusting sleeve 20 is sleeved outside the anchor 10 and is in threaded cooperation with the anchor 10. By rotating the adjusting sleeve 20, the adjusting sleeve 20 moves relative to the anchor 10 along the extension direction of the steel strand 50, so that the relative position between the anchor 10 and the steel strand 50 can be controlled more precisely, improving the precision and flexibility of the tensioning construction of the steel strand 50 and facilitating the fine adjustment of the prestress on the steel strand 50.

[0034] In one embodiment, the anchor hole 11 includes a tapered section 111 and a cylindrical section 112. The smaller-diameter end of the tapered section 111 is connected to the cylindrical section 112, and the clamp 12 is in the shape of a cone matching the tapered section 111.

[0035] Please refer to Figure 2 , the tapered section 111 of the anchor 10 has a gradually decreasing inner diameter from outside to inside. Under the action of prestress, the steel strand 50 drives the clamp 12 to move towards the smaller-diameter end of the tapered section 111 until the clamp 12 is clamped with the tapered section 111, generating a self-locking effect to ensure that the steel strand 50 will not slide or become loose under the action of prestress, improving the safety and reliability of the system.

[0036] In one embodiment, the clamp 12 is composed of a plurality of clamping pieces assembled circumferentially, and the plurality of clamping pieces jointly clamp the steel strand 50.

[0037] Understandably, multiple clamping pieces are spliced circumferentially to form the fixture 12, which facilitates the installation and disassembly of the fixture 12. The multiple clamping pieces provide multi-point clamping force to the steel strand 50, enabling the steel strand 50 to be uniformly coated and clamped. In one embodiment, the fixture 12 is composed of two clamping pieces that are spliced together circumferentially.

[0038] In one embodiment, a biting groove is provided on the hole wall of the clamping hole 121.

[0039] Furthermore, the design of the biting groove increases the friction between the hole wall of the clamping hole 121 and the steel strand 50, enhances the clamping force of the fixture 12 on the steel strand 50, prevents the steel strand 50 from sliding when stressed, and can ensure that the prestress on the steel strand 50 is more evenly transmitted to the anchor 10, improving the efficiency and effect of prestress transmission.

[0040] In one embodiment, a buffer pad is provided between the anchor backing plate 30 and the adjusting sleeve 20.

[0041] It can be explained that the adjusting sleeve 20 abuts against the anchor backing plate 30 under the action of the prestress on the steel strand 50. The buffer pad can disperse the abutting force exerted by the adjusting sleeve 20 on the anchor backing plate 30, preventing the abutting force exerted by the adjusting sleeve 20 on the anchor backing plate 30 from being too concentrated and causing damage to the anchor backing plate 30. In addition, the buffer pad can provide additional friction and stability between the adjusting sleeve 20 and the anchor backing plate 30, preventing misalignment or loosening between the adjusting sleeve 20 and the anchor backing plate 30, and ensuring the stability of the prestress on the steel strand 50.

[0042] In one embodiment, a pressure sensor is installed between the anchor backing plate 30 and the adjusting sleeve 20.

[0043] Furthermore, the adjusting sleeve 20 maintains the prestress on the steel strand 50 by abutting against the anchor backing plate 30. The magnitude of the abutting force of the adjusting sleeve 20 on the anchor backing plate 30 is the same as the magnitude of the prestress on the steel strand 50. By measuring the abutting force between the anchor backing plate 30 and the adjusting sleeve 20 with the pressure sensor, the prestress on the steel strand 50 can be measured, and it can prevent the abutting force of the adjusting sleeve 20 on the anchor backing plate 30 from being too large and causing damage to the structure of the anchor backing plate 30.

[0044] In one embodiment, the length of the adjusting sleeve 20 is greater than or equal to the length of the anchor 10.

[0045] It should be noted that the length of the adjusting sleeve 20 is greater than or equal to the length of the anchor 10, so that when the adjusting sleeve 20 moves relative to the anchor 10, the adjusting sleeve 20 and the anchor 10 always remain connected, avoiding the adjusting sleeve 20 from detaching from the anchor 10. Moreover, both the adjusting sleeve 20 and the anchor 10 have a certain length, enabling the relative movement of the adjusting sleeve 20 relative to the anchor 10 to have a sufficient movement range, thereby ensuring a large adjustment range for the prestress of the steel strand 50.

[0046] The present utility model further provides a prestressed concrete structure, which applies the prestressed anchor equipment for the steel strand as described above. For the specific structure of the prestressed anchor equipment for the steel strand, reference may be made to the above-mentioned embodiments. Since this prestressed concrete structure adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated herein one by one.

[0047] The above is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A prestressed anchorage device for a steel strand, characterized in that, include: An anchor, the anchor is in a cylindrical shape, an anchor hole is provided in the anchor for the steel strand to pass through, a clamp is movably inserted in the anchor hole, a clamp hole is provided on the clamp for the steel strand to pass through, the clamp hole is connected to the anchor hole, and the clamp can clamp the steel strand passing through the clamp hole; An adjusting sleeve, which is sleeved outside the anchor and can move relative to the anchor along the extension direction of the steel strand; An anchor plate, wherein a through hole is formed on the anchor plate for the steel strand to pass through, and the adjusting sleeve abuts against the anchor plate; A U-shaped frame, wherein the U-shaped frame cover is arranged outside the anchor and the adjusting sleeve, the end of the U-shaped frame abuts against the anchor pad, the U-shaped frame is provided with a through hole for the steel strand to pass through, and the side of the U-shaped frame away from the anchor forms an abutment platform for the abutment of an external jack.

2. The prestressed anchor device for steel stranded wire according to claim 1, characterized in that, The outer wall of the anchor is provided with a first thread, and the inner wall of the adjusting sleeve is provided with a second thread matching with the first thread.

3. The prestressed anchor device for steel strand according to claim 1, characterized in that, The anchor hole comprises a conical section and a cylindrical section, an end of the conical section with a smaller aperture is connected to the cylindrical section, and the clamp is in a conical shape matching the shape of the conical section.

4. The prestressed anchor device for steel stranded wire according to claim 1, characterized in that, The clamp is composed of a plurality of clips spliced ​​together in the circumferential direction, and the plurality of clips clamp the steel strand together.

5. The prestressed anchor device for steel strands according to claim 4, characterized in that, The clamp consists of two clamping pieces which are joined together along the annular direction.

6. The prestressed anchorage device for steel stranded wires according to any one of claims 1 to 5, characterized in that, An engaging groove is provided on the hole wall of the clamping hole.

7. The prestressed anchorage device for steel strand according to any one of claims 1 to 5, characterized in that A buffer pad is provided between the anchor plate and the adjusting sleeve.

8. The prestressed anchorage device for steel stranded wires according to any one of claims 1 to 5, characterized in that A pressure sensor is installed between the anchor plate and the adjusting sleeve.

9. The prestressed anchor device for steel stranded wire according to any one of claims 1 to 5, characterized in that, The length of the adjusting sleeve is greater than or equal to the length of the anchor.

10. A prestressed concrete structure, characterized in that, A prestressed anchor device for a steel strand as claimed in any one of claims 1 to 9 is used.

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