A prestressed tendon composite clamping anchoring structure

Abstract

This utility model relates to the technical field of components used in prestressed structures, and more particularly to a composite clamping and anchoring structure for prestressed tendons. This utility model is a combined invention. By setting a compression sleeve at the end of the prestressed tendon extending beyond the wedge-shaped clamp, it achieves both wedge-tight anchoring and compression-grip anchoring. Simultaneously, the compression sleeve and the large end of the wedge-shaped clamp are pressed together, meaning the compression sleeve presses the wedge-shaped clamp in the direction of force on the prestressed tendon, further improving the wedge-tightening effect. Moreover, after the compression sleeve presses the wedge-shaped clamp, the two work together to form a relatively fixed whole in the axial direction of the prestressed tendon, forming a wedge-tight gripping composite anchor body at the end of the prestressed tendon. When the prestressed tendon reaches the set tension, the wedge-tight gripping composite anchor body can be pushed into the conical hole as a whole to achieve overall anchoring, resulting in a relatively reliable anchoring effect.

Description

Technical Field

[0001] This utility model relates to the field of components used in prestressed structures, and in particular to a composite clamping and anchoring structure for prestressed tendons. Background Technology

[0002] Prestressed anchorages are commonly used structural reinforcement components in infrastructure construction, and their anchoring reliability has a significant impact on their support capacity. For example, the anchorage disclosed in Chinese utility model patent CN200952401Y includes a tray (an anchor plate), an anchor ring, and steel strands. The anchor ring has a conical hole through which the outer end of the steel strand passes. A wedge-shaped clamp is installed inside the conical hole to hold the steel strand. When the steel strand is subjected to inward force, the wedge-shaped clamp tightens within the conical hole, and the greater the force, the more pronounced the wedging effect, thus achieving anchoring. However, this traditional anchoring method, when applied to prestressed structures such as slings, cables, booms, tie rods, suspension anchors, and pressure vessels that bear large vertical amplitude alternating stress, carries the risk of the wedge-shaped clamp dislodging from the conical hole, leading to anchoring failure. Utility Model Content

[0003] The purpose of this utility model is to provide a prestressed tendon composite clamping and anchoring structure to solve the problem that existing anchoring methods rely on wedge-shaped clamps and conical holes, which may lead to anchoring failure under alternating force conditions with large amplitudes, as the wedge-shaped clamps may be pushed out of the conical holes.

[0004] The prestressed tendon composite clamping and anchoring structure of this utility model includes an anchor plate and an anchor ring. The anchor ring is provided with a conical hole, and the anchor plate is provided with a clearance channel corresponding to the conical hole to allow the prestressed tendon to pass through. The end of the prestressed tendon passes through the clearance channel and the conical hole from the inside to the outside. A set of wedge-shaped clips are installed in the conical hole to cooperate with it and to wedge the prestressed tendon. The outer end of the prestressed tendon extends beyond the wedge-shaped clips and is provided with a compression sleeve to achieve gripping anchoring. The compression sleeve presses against the end of the set of wedge-shaped clips on the inner side of the conical hole and cooperates with the set of wedge-shaped clips to form a wedge-tight gripping composite anchor body.

[0005] Furthermore, the large end of the wedge-shaped clamp protrudes from the conical hole, causing the extrusion sleeve to press against the large end of the wedge-shaped clamp on the outside of the conical hole.

[0006] Furthermore, the outer diameter of the extrusion sleeve is not greater than the inner diameter of the large-diameter end of the tapered hole and not less than the inner diameter of the small-diameter end of the tapered hole.

[0007] Furthermore, the outer diameter of the compression sleeve is not less than half the outer diameter of the large end of the wedge clip.

[0008] Furthermore, the end face of the compression sleeve facing the wedge-shaped clip is an annular plane.

[0009] Furthermore, the length of the compression sleeve is comparable to the length of the wedge-shaped clip.

[0010] Furthermore, the prestressing tendons are steel strands or reinforcing bars.

[0011] Furthermore, the set of wedge clips includes a pair of two wedge clips.

[0012] This invention is a combined invention. By setting a compression sleeve at the end of the prestressing tendon that extends beyond the wedge-shaped clamp, it achieves both wedge-tight anchoring and compression-grip anchoring. Simultaneously, the compression sleeve and the large end of the wedge-shaped clamp are pressed together, meaning the compression sleeve presses the wedge-shaped clamp in the direction of force on the prestressing tendon, which further improves the wedge-tightening effect. Moreover, after the compression sleeve presses the wedge-shaped clamp, the two work together to form a relatively fixed whole in the axial direction of the prestressing tendon, forming a wedge-tight grip composite anchor body at the end of the prestressing tendon. When the prestressing tendon reaches the set tension, the wedge-tight grip composite anchor body can be pushed into the conical hole as a whole to achieve overall anchoring, resulting in a more reliable anchoring effect.

[0013] Compared to existing methods that use either wedge-tight anchoring or compression-grip anchoring alone, this scheme combines wedge-tight grip-grip composite anchoring. The two methods work together to achieve simultaneous anchoring and enhance the wedge-tight anchoring effect, forming a larger anchor body at the end of the prestressing tendon. This ensures better anchoring reliability under alternating force conditions. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of one embodiment of the prestressed tendon composite clamping and anchoring structure of this utility model during use.

[0015] In the diagram: 1. Anchor plate; 2. Anchor ring; 3. Wedge-shaped wedge; 4. Extrusion sleeve; 5. Steel strand; 6. Support component; 7. Clearance passage. Detailed Implementation

[0016] This invention addresses the problem that existing prestressed anchorages use wedge-shaped clamps for wedge-tight anchoring of prestressed tendons. However, under alternating force conditions with large amplitude, the wedge-shaped clamps lack self-locking capability with the conical hole, posing a risk of wedge-tight anchoring failure due to the risk of clamps disengaging. By adding a compression-grip anchoring method to the wedge-tight anchoring, and simultaneously pressing the compression sleeve against the end of the wedge-shaped clamp, the wedge-tight anchoring and compression-grip anchoring work together to form a wedge-tight grip composite anchor body at the end of the steel strand. This ensures better anchoring reliability under alternating force conditions for the prestressed tendons.

[0017] Based on the above concept, the implementation method of the prestressed tendon composite clamping and anchoring structure of this utility model is as follows:

[0018] like Figure 1As shown, the prestressed tendon composite clamping and anchoring structure of this utility model includes an anchor plate and an anchor ring. The anchor plate is fitted to the supported member and is used to bear the anchoring preload. The anchor ring is installed on the side of the anchor plate facing away from the supported member, i.e., the outer side. The anchor ring has a conical hole, and the anchor plate has a clearance channel corresponding to the conical hole to allow the prestressed tendon to pass through. The end of the prestressed tendon passes through the clearance channel and the conical hole from the inside to the outside. A set of wedge-shaped clamps that mate with the conical surface of the conical hole are installed in the conical hole. The set of wedge clamps consists of two symmetrical pairs of wedge-shaped clamps that fasten to the outside of the prestressed tendon, or it can also consist of three wedge-shaped clamps that surround the outside of the prestressed tendon. The outer end of the prestressed tendon extends out of the conical hole and beyond the wedge-shaped clamps. A compression sleeve is provided at the outer end of the prestressed tendon to achieve compression and grip anchoring.

[0019] Based on this structure, the extrusion sleeve forms an extrusion grip anchorage at the outer end of the prestressing tendon. Under the tension of the prestressing tendon, the extrusion sleeve moves inward and pushes the group of wedge-shaped clips to move, thereby pushing the group of wedge-shaped clips into the conical hole. The inner surface of the group of wedge-shaped clips contacts the prestressing tendon. As the thrust of the extrusion sleeve on the wedge-shaped clips increases, the inward end face of the extrusion sleeve and the outer end face of the group of wedge-shaped clips come into contact and press together. At this time, the extrusion sleeve and the group of wedge-shaped clips become a whole that will not move relative to each other in the axial direction of the prestressing tendon. As the tension of the prestressing tendon further increases, under the thrust of the extrusion sleeve, the wedge-shaped clips radially clamp the prestressing tendon under the action of the conical surface of the conical hole, realizing wedge-tight anchorage. That is, the group of wedge-shaped clips and the extrusion sleeve form a wedge-tight grip composite anchorage at the outer end of the prestressing tendon. As the tension of the prestressing tendon gradually increases, when the expected tension of the prestressing tendon is reached, the pushing amount of the extrusion sleeve onto the wedge-shaped clamp reaches the set maximum value, thus achieving permanent, safe and reliable anchoring of the prestressing tendon. In other words, the anchoring structure of this utility model achieves self-propelled anchoring.

[0020] The greater the force on the prestressed tendon of this anchoring structure, the more obvious the pushing effect of the compression sleeve on the wedge-shaped clamp, and the more obvious the wedging effect of the wedge-shaped clamp on the prestressed tendon. Therefore, even when applied to alternating force conditions with large amplitude, the compression effect of the compression sleeve on the wedge-shaped clamp avoids the risk of anchoring failure caused by the wedge-shaped clamp coming out.

[0021] More specifically, the large end of the wedge-shaped clamp protrudes from the conical hole, causing the extrusion sleeve to press against the large end of the wedge-shaped clamp on the outside of the conical hole. This ensures that even under large-amplitude alternating forces during use, when the prestressing tendon pulls the extrusion sleeve inward, there is a certain pre-reserved gap between the extrusion sleeve and the conical hole. This prevents the extrusion sleeve from being unable to advance and press against the wedge-shaped clamp due to interference from the conical hole, ensuring that the extrusion sleeve is always pressed against the end of the wedge-shaped clamp. Furthermore, the outer diameter of the extrusion sleeve is no greater than the inner diameter of the large-diameter end of the conical hole and no less than the inner diameter of the small-diameter end of the conical hole. This design allows for a greater axial distance that the extrusion sleeve needs to travel as the prestressing tendon moves inward to contact the inner wall of the conical hole, making interference with the conical hole less likely.

[0022] To achieve a reliable pushing effect on the wedge-shaped clamp, the outer diameter of the compression sleeve should be no less than half the outer diameter of the large end of the wedge-shaped clamp. The outer diameter of the compression sleeve can be equal to half the outer diameter of the large end of the wedge-shaped clamp, greater than half the outer diameter of the large end of the wedge-shaped clamp, or directly equal to the outer diameter of the large end of the wedge-shaped clamp. Of course, in other embodiments, it is also feasible to apply a pressing and pushing action to the wedge-shaped clamp from its entire large end face, even if the outer diameter of the compression sleeve is greater than the outer diameter of the large end of the wedge-shaped clamp.

[0023] The compression sleeve is a traditional and commonly used compression anchoring sleeve. Its end face facing the wedge-shaped clamp is an annular plane, which allows for the application of axial thrust to the wedge-shaped clamp. Furthermore, the inner conical surface of the conical hole ensures that the wedge-shaped clamp stably moves radially towards the prestressing tendon of the clamping member during axial movement. Of course, in some embodiments, the end face of the compression sleeve facing the wedge-shaped clamp can also be a conical surface that facilitates the radial approach of the wedge-shaped clamp when it is pushed.

[0024] When selecting the compression sleeve, in order to ensure the reliability of the compression grip anchor and the reliable pushing and pressing of the wedge clip, the length of the compression sleeve should not be too short. However, considering that the wedge clamping anchor and the grip anchor do not occupy a large axial space when used in combination, the length of the compression sleeve should not be too long either. Therefore, in this embodiment, the length of the compression sleeve is comparable to the length of the wedge clip, for example, the two are equal, or the compression sleeve is slightly longer than the wedge clip, or the wedge clip is slightly longer than the compression sleeve.

[0025] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A prestressed tendon composite clamping and anchoring structure, characterized in that, It includes an anchor plate and an anchor ring. The anchor ring has a conical hole, and the anchor plate has a clearance channel corresponding to the conical hole to allow the prestressing tendons to pass through. The end of the prestressing tendon passes through the clearance channel and the conical hole from the inside to the outside. The conical hole is equipped with a set of wedge-shaped clips that cooperate with it and are used to wedge the prestressing tendon. The outer end of the prestressing tendon extends beyond the wedge-shaped clips and is provided with a compression sleeve to achieve gripping anchoring. The compression sleeve presses against the end of the set of wedge-shaped clips on the inside of the conical hole and cooperates with the set of wedge-shaped clips to form a wedge-tight gripping composite anchor body.

2. The prestressed tendon composite clamping and anchoring structure according to claim 1, characterized in that, The large end of the wedge-shaped clamp protrudes from the conical hole, causing the extrusion sleeve to press against the large end of the wedge-shaped clamp on the outside of the conical hole.

3. The prestressed tendon composite clamping and anchoring structure according to claim 2, characterized in that, The outer diameter of the extrusion sleeve is not greater than the inner diameter of the large diameter end of the tapered hole and not less than the inner diameter of the small diameter end of the tapered hole.

4. The prestressed tendon composite clamping and anchoring structure according to claim 2, characterized in that, The outer diameter of the compression sleeve shall not be less than half the outer diameter of the large end of the wedge clip.

5. The prestressed tendon composite clamping and anchoring structure according to any one of claims 1-4, characterized in that, The end face of the extrusion sleeve facing the wedge-shaped clip is an annular plane.

6. The prestressed tendon composite clamping and anchoring structure according to any one of claims 1-4, characterized in that, The length of the compression sleeve is approximately the same as the length of the wedge-shaped clip.

7. The prestressed tendon composite clamping and anchoring structure according to any one of claims 1-4, characterized in that, Prestressed tendons are steel strands or steel bars.

8. The prestressed tendon composite clamping and anchoring structure according to any one of claims 1-4, characterized in that, A set of wedge clips consists of a pair of two wedge clips.

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