Prestressed steel strand anchorage device

Abstract

The utility model relates to a prestressed steel strand anchorage device, the prestressed steel strand anchorage device comprises at least two clamping pieces, an anchor plate, a base plate and a threaded rib, the at least two clamping pieces are spliced to form a frustum for clamping a steel strand, the center of the spliced frustum is provided with a clamping hole, and the threaded rib is arranged in the clamping hole. Reinforcing ribs are arranged on the outer surface of the frustum; one end of the anchor plate abuts against the base plate, an anchoring hole matched with the frustum in shape is formed in the anchor plate, and the frustum is located in the anchoring hole and communicated with the clamping hole. A through hole communicated with the anchoring hole is formed in the base plate, and the two ends of the threaded rib abut against the face, away from the anchor plate, of the base plate and concrete respectively. The prestressed steel strand anchorage device can be matched with a prestressed steel strand with higher strength, and the safety and reliability of the prestressed steel strand during tensioning are improved.

Description

Technical Field

[0001] This utility model relates to the field of prestressed anchorage technology, and in particular to a prestressed steel strand anchorage. Background Technology

[0002] In modern construction engineering, prestressed technology is an important technique widely used in large-span structures, high-rise buildings, railways, bridges, and other large-scale building structures. The core of prestressed technology lies in improving the load-bearing capacity and stability of a structure through pre-applied stress. As a key material in prestressed structures, the method of fixing steel strands directly affects the performance and safety of the prestressed structure.

[0003] Currently, the prestressed concrete steel strands commonly used in domestic railway and bridge construction are 1860MPa grade steel strands. However, with technological advancements, 2300MPa grade high-strength steel strands are gradually being applied. These strands can save approximately 20% of steel consumption, enabling bridges to have larger spans, be lighter, have higher strength, and be safer. However, the strength of anchorages for 1860MPa grade steel strands is not suitable for 2300MPa grade high-strength steel strands.

[0004] Therefore, a prestressed anchor for steel strands is proposed to adapt to high-strength prestressed steel strands, so as to solve the safety and reliability of prestressed steel strand tensioning. Utility Model Content

[0005] In view of this, the present invention provides a prestressed steel strand anchor to solve the problem of anchor adapting to high-strength prestressed steel strands.

[0006] To achieve the above objectives, the technical solution of this utility model is to provide a prestressed steel strand anchor, comprising: a clamping plate, an anchor plate, a pad plate, and threaded reinforcement bars. The clamping plates are at least two in number, and at least two clamping plates are joined to form a truncated cone for clamping the steel strand. The truncated cone has a clamping hole at its center, and reinforcing ribs are provided on its outer surface. One end of the anchor plate abuts against the pad plate and has an anchoring hole adapted to the shape of the truncated cone. The truncated cone is located within the anchoring hole and communicates with the clamping hole. A through hole 3 communicating with the anchoring hole is provided on the pad plate. Both ends of the threaded reinforcement bars abut against the side of the pad plate away from the anchor plate and the concrete, respectively.

[0007] In one embodiment, the reinforcing rib includes a first reinforcing rib and a second reinforcing rib. The first reinforcing rib is disposed on opposite sides of the outer surface of a single clamping piece along a direction perpendicular to the axis of the clamping hole, and the second reinforcing rib is disposed at the middle position of opposite sides of the outer surface of a single clamping piece.

[0008] In one embodiment, the first reinforcing rib is in the shape of a quarter cylinder, and the second reinforcing rib is in the shape of a semi-cylindrical cylinder. Both the first and second reinforcing ribs extend from one end of the clamping piece to the other end along the axial direction of the clamping hole.

[0009] In one embodiment, the connection between the first reinforcing rib and the second reinforcing rib and the outer surface of the clip is rounded.

[0010] In one embodiment, both the clamping piece and the anchor plate have chamfered ends at their two planar ends along the axial direction of the clamping hole.

[0011] In one embodiment, the outer surface of the clip has a fan-shaped groove.

[0012] In one implementation, the inner surface of the clip 1 is a serrated surface or a threaded surface.

[0013] In one embodiment, the ratio of the tooth pitch to the tooth depth of the threaded surface is 1:1.5.

[0014] In one embodiment, the pad includes a connecting plate and a guide post, the through hole penetrates the connecting plate and the guide post, the anchor plate abuts against the side of the connecting plate away from the guide post, and the threaded rib is sleeved on the guide post and abuts against the side of the connecting plate away from the anchor plate.

[0015] In one embodiment, the anchor plate has multiple anchoring holes, all of which are connected to the through hole. Each anchoring hole is provided with at least two conical truncated cones formed by the splicing of the clamping pieces, and the clamping hole formed by each conical truncated cone is connected to each anchoring hole.

[0016] Compared with the prior art, the prestressed steel strand anchorage provided by this utility model has the following beneficial effects:

[0017] By adding reinforcing ribs to the outer surface of each individual wedge, the structural strength of each wedge is increased. This allows the wedges to withstand greater radial pressure without damage or deformation when they are assembled to form a truncated cone and clamp the steel strand. As a result, the anchor can be adapted to higher strength prestressed steel strands, improving the safety and reliability of prestressed steel strand tensioning. Attached Figure Description

[0018] Figure 1 A structural schematic diagram of a prestressed steel strand anchor provided by this utility model;

[0019] Figure 2 for Figure 1 Schematic diagram of the positional relationship between prestressed steel strand anchorages and concrete structures;

[0020] Figure 3 for Figure 1 A schematic diagram of the structure formed by assembling the middle clamps to create a frustum;

[0021] Figure 4 for Figure 1 Schematic diagram of the middle clip;

[0022] Figure 5 for Figure 1 Schematic diagram of the middle anchor plate;

[0023] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure of the middle anchor plate;

[0024] Figure 7 for Figure 1 Schematic diagram of the cross-sectional structure of the intermediate pad;

[0025] Figure 8 for Figure 1 Schematic diagram of the structure of the threaded reinforcement bar;

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Clamping plate; 11. Clamping hole; 12. Reinforcing rib; 121. First reinforcing rib; 122. Second reinforcing rib; 13. Fan ring groove; 2. Anchor plate; 21. Anchoring hole; 3. Pad plate; 31. Through hole; 32. Connecting plate; 33. Guide post; 4. Threaded rib. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0029] Please see Figure 1-8 This utility model provides a prestressed steel strand anchor, comprising:

[0030] The components include a clamping plate 1, an anchor plate 2, a pad plate 3, and a threaded rib 4. The number of clamping plates 1 is at least two. At least two clamping plates 1 are joined together to form a cone for clamping the steel strand. The center of the joined cone has a clamping hole 11, and a reinforcing rib 12 is provided on the outer surface of the cone.

[0031] One end of the anchor plate 2 abuts against the pad plate 3, and has an anchoring hole 21 that is adapted to the shape of the truncated cone. The truncated cone is located in the anchoring hole 21 and communicates with the clamping hole 11.

[0032] The pad 3 has a through hole 31 that communicates with the anchor hole 21, and the two ends of the threaded bar 4 abut against the side of the pad 3 away from the anchor plate 2 and the concrete, respectively.

[0033] Specifically, at least two clamping pieces 1, when joined together, have a gap between their inner surfaces, forming a clamping hole 11. When the truncated cone is placed inside the anchoring hole 21, the outer surface of the truncated cone, i.e., the outer surface of the clamping piece 1 and the reinforcing ribs 12 provided on the outer surface, are in contact with the inner wall of the anchoring hole 21, making the clamping hole 11, the anchoring hole 21, and the through hole 31 interconnected. When anchoring with steel strands, the steel strands are first passed through the through hole 31 into the anchoring hole 21 and the clamping hole 11. Then, tension is applied to the steel strands, causing them to move towards the pad 3 within the clamping hole 11. Utilizing the friction between the steel strands and the inner surface of the clamping piece 1, as well as the conical sidewall of the anchoring hole 21, at least two clamping pieces 1 are subjected to radial compressive force and move towards the center of the clamping hole 11, i.e., a wedge effect, thereby clamping / engaging the steel strands. Finally, the prestress of the steel strands is transferred to the concrete structure through the abutment of the threaded ribs 4, completing the anchoring of the steel strands.

[0034] In this embodiment, by providing reinforcing ribs on the outer surface of the frustum formed by the clamping piece 1, the strength of the clamping piece 1 can be enhanced, preventing the clamping piece 1 from deforming or being damaged when subjected to radial compressive force. This allows it to adapt to higher strength prestress while also extending its service life.

[0035] It is understandable that the number of clamping pieces 1 can be set according to the requirements, as long as multiple clamping pieces 1 can be spliced ​​together to form a truncated cone, and the truncated cone has clamping holes 11 for clamping steel strands.

[0036] Preferably, there are two clips 1, which are spliced ​​together to form a frustum, wherein both clips 1 are fan-shaped with tapered outer surfaces.

[0037] It should be noted that the material of anchor plate 2 is 40Cr.

[0038] In one embodiment, the reinforcing rib 12 includes a first reinforcing rib 121 and a second reinforcing rib 122. The first reinforcing rib 121 is disposed on opposite sides of the outer surface of the single clamping piece 1 along a direction perpendicular to the axis of the clamping hole 11, and the second reinforcing rib 122 is disposed at the middle position of opposite sides of the outer surface of the single clamping piece 1.

[0039] It should be noted that by setting the first reinforcing rib 121 and the second reinforcing rib 122, the clamping piece 1 can be assembled to form a truncated cone. When the steel strand is subjected to radial extrusion force during the anchoring process, the first reinforcing rib 121 and the second reinforcing rib 122 are located on the outer surface of the truncated cone and in contact with the inner wall of the anchoring hole 21, which is a part where stress concentration is likely to occur. This disperses the stress, reduces the degree of stress concentration, and extends the service life of the clamping piece.

[0040] Furthermore, the first reinforcing rib 121 is in the shape of a quarter cylinder, and the second reinforcing rib 122 is in the shape of a semi-cylinder. Both the first reinforcing rib 121 and the second reinforcing rib 122 extend from one end of the clamping piece 1 to the other end along the axial direction of the clamping hole 11.

[0041] It is understandable that after two adjacent clips 1 are joined together, the first reinforcing ribs 121 of the two clips 1 are spliced ​​from quarter-cylinder shapes to form a semi-cylinder shape.

[0042] It should be noted that the first reinforcing rib 121 and the second reinforcing rib 122 can also be other shapes and structures, as long as they can increase the structural strength of the clip 1.

[0043] Furthermore, the connection between the first reinforcing rib 121 and the second reinforcing rib 122 and the outer surface of the clip 1 is rounded with a fillet R to reduce stress concentration when subjected to force.

[0044] Furthermore, both ends of the clamping plate 1 and the anchor plate 2 along the axial direction of the clamping hole 11 are provided with chamfers C, so that the conical truncated form of the clamping plate 1 can be inserted into the anchoring hole 21 and the steel strand can enter the clamping hole 11.

[0045] Furthermore, the outer surface of the clip 1 has a fan-shaped groove 13. After at least two clips 1 are joined together, the fan-shaped grooves 13 on the at least two clips 1 are interconnected to form a ring. A rope made of flexible material can be used to tie at least two clips 1 together through the interconnected fan-shaped grooves 13 so that the at least two clips 1 are aligned when joined together, that is, to prevent the clips 1 from being misaligned during the joining process.

[0046] In one embodiment, the inner surface of the clamp 1 is a serrated surface or a threaded surface to increase the friction when clamping the steel strand.

[0047] It is understandable that after at least two clips 1 are joined together, the inner surface of clip 1 forms the inner wall of clamping hole 11, which is the contact surface with the steel strand. By setting the inner surface of clip 1 as a sawtooth surface or a threaded surface, the friction between the inner wall of clamping hole 11 and the steel strand during the anchoring process is increased, thereby enhancing the anchoring effect.

[0048] Furthermore, the ratio of tooth pitch to tooth depth on the threaded surface is 1:1.5.

[0049] It should be noted that when the inner surface of the clamp 1 is set as a threaded surface, when the ratio of tooth pitch to tooth depth is set to 1:1.5 and the tooth profile angle remains unchanged, sufficient tooth depth and sufficient biting strength can be obtained to avoid stripping.

[0050] In one embodiment, the pad 3 includes a connecting plate 32 and a guide post 33, a through hole 31 passing through the connecting plate 32 and the guide post 33, an anchor plate 2 abutting against the side of the connecting plate 32 away from the guide post 33, and a threaded rib 4 sleeved on the guide post 33 and abutting against the side of the connecting plate 32 away from the anchor plate 2.

[0051] It is understandable that by setting the guide post 33, the force direction of the threaded rib 4 can be guided, so as to avoid the threaded rib 4 deviating from the axis of the guide post 33 after being subjected to force.

[0052] In one embodiment, the anchor plate 2 has multiple anchor holes 21, all of which are connected to the through hole 31. Each anchor hole 21 is provided with at least two conical truncated cones formed by the splicing of clamping pieces 1, and the clamping hole 11 formed by each conical truncated cone is connected to each anchor hole 21.

[0053] It is understandable that by setting multiple anchoring holes 21 on the anchor plate 2, each anchoring hole 21 is provided with a truncated cone, and the clamping hole 11 of each truncated cone is connected to the anchoring hole 21, multiple steel strands can be anchored at the same time when anchoring the steel strands.

[0054] Preferably, the number of anchor holes 21 is four.

[0055] Taking the number of clips 1 as two as an example, the working principle of this utility model is explained as follows:

[0056] When anchoring with steel strands is required, the anchor plate 3 is fitted onto the end of the steel strand bundle. Multiple steel strands are passed through the through holes 31 on the plate 3, and each steel strand is fed into the anchoring hole 21 of the anchor plate 2. Next, two clamping pieces 1 are placed in each anchoring hole 21, and the two clamping pieces 1 are joined together to form a truncated cone, with the steel strand positioned within the clamping hole 11 of the truncated cone. Then, the jack is slowly depressurized, causing each steel strand to retract and slowly move the truncated cone formed by the two clamping pieces 1. Under the pressure of the conical anchoring hole 21, the radial force on the two clamping pieces 1 gradually increases, causing the clamping pieces 1 to move towards the axial direction of the clamping hole 11, using the inner surface of the clamping pieces 1 to engage the steel strand. When the truncated cone moves to the point where it is abutted by the anchoring hole 21, that is, after the steel strand is engaged by the inner surface of the clamping piece 1, and there is no relative slippage between the steel strand and the inner surface of the clamping piece 1, the anchor is complete in anchoring the steel strand.

[0057] Compared with the prior art, the prestressed steel strand anchor provided by this utility model increases the structural strength of a single clamp by setting reinforcing ribs on the outer surface of the single clamp. This allows the clamp to withstand greater radial pressure without damage or deformation when the clamps are assembled to form a truncated cone and clamp the steel strand. As a result, the anchor can be adapted to higher strength prestressed steel strands, improving the safety and reliability of prestressed steel strand tensioning.

[0058] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A prestressed steel strand anchor, characterized in that, The utility model relates to a prestressed steel strand anchor, comprising: clamps, anchor plates, backing plates and threaded bars, the number of the clamps is at least two, at least two of the clamps are spliced to form a cone that clamps the steel strand, and the center of the spliced cone has a clamping hole, and the outer surface of the cone is provided with reinforcing ribs; one end of the anchor plate is in abutment with the backing plate, and the anchor plate has an anchor hole that is adapted to the shape of the cone, the cone is located in the anchor hole, and the clamping hole is in communication with the anchor hole; the backing plate has a through hole that is in communication with the anchor hole, and the threaded bars are in abutment with the side of the backing plate that is away from the anchor plate and the concrete respectively.

2. The prestressed steel strand anchor according to claim 1, wherein: the reinforcing ribs comprise first reinforcing ribs and second reinforcing ribs, the first reinforcing ribs are arranged on opposite sides of the outer surface of a single clamp in a direction perpendicular to the axis of the clamping hole, and the second reinforcing ribs are arranged at the middle positions of the opposite sides of the outer surface of a single clamp.

3. The prestressed steel strand anchor according to claim 2, wherein: the first reinforcing ribs are in the shape of a quarter of a cylinder, the second reinforcing ribs are in the shape of a half of a cylinder, and the first reinforcing ribs and the second reinforcing ribs are both extended from one end to the other end of the clamp along the axis direction of the clamping hole.

4. The prestressed steel strand anchor according to claim 2, wherein: the junctions between the first reinforcing ribs, the second reinforcing ribs and the outer surface of the clamp are all formed into round corners.

5. The prestressed steel strand anchor according to claim 1, wherein: the clamps and the anchor plates are both provided with chamfers at the flat ends of the two ends along the axis direction of the clamping hole.

6. The prestressed steel strand anchor according to claim 1, wherein: the outer surface of the clamp has a fan ring groove.

7. The prestressed steel strand anchor according to claim 1, wherein: the inner surface of the clamp is a sawtooth surface or a threaded surface.

8. The prestressed steel strand anchor according to claim 7, wherein: the ratio of the pitch to the depth of the teeth of the threaded surface is 1:1.

5.

9. The prestressed steel strand anchor according to claim 1, wherein: the backing plate comprises a connecting plate and a guide column, the through hole penetrates through the connecting plate and the guide column, the anchor plate is in abutment with the side of the connecting plate that is away from the guide column, and the threaded bars are sleeved on the guide column and in abutment with the side of the connecting plate that is away from the anchor plate.

10. The prestressed steel strand anchor according to any one of claims 1-9, wherein: the anchor plate has a plurality of anchor holes, the plurality of anchor holes are all in communication with the through hole, at least two of the cones formed by the splicing of the clamps are arranged in each of the anchor holes, and the clamping holes formed by each of the cones are in communication with each of the anchor holes respectively.

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