A prestressed tension limiting plate

Abstract

The present invention discloses a prestressed tension limiting plate, belonging to the technical field of prestressed tensioning. It includes a limiting plate body, and there is at least one strand perforation on the limiting plate body; sunken holes are provided at positions corresponding to the wire inlet sides of each strand perforation on the limiting plate body, and auxiliary clamping clips are arranged in the sunken holes. The auxiliary clamping clip includes a housing and a clamping body. A through hole is provided in the center of the housing, the clamping body is arranged around the through hole, and an elastic structure for clamping the clamping bodies together is provided between the clamping body and the housing. The inventive concept of the present invention is ingenious, which can greatly reduce the potential safety hazards in the tensioning operation and is an important improvement to the prior art.

Description

Technical Field

[0001] The present invention relates to a prestressed tension limiting plate, belonging to the technical field of prestressed tensioning. Background Art

[0002] Bridge prestressed construction is a key process to ensure the safety and durability of bridge structures. The main equipment for tensioning is a prestressed tensioning machine. During tensioning, the steel strands are sequentially passed through the working anchor, the limiting plate, the jack, and the tool anchor. The tensioning machine provides hydraulic pressure for the jack and controls the entire tensioning process.

[0003] Currently, in all prestressed tensioning and anchoring processes, the working anchor wedge grips are driven to retract by the retraction force of the steel strands. However, since the working anchor wedge grips are of a two-piece structure, the two-piece wedge grips often retract unevenly and are not aligned. This situation is extremely likely to cause various accidents and poses serious safety hazards. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the present invention proposes a prestressed tension limiting plate, which can level the two-piece wedge grips of the working anchor, so that the working anchor wedge grips can be kept as neat as possible after anchoring.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A prestressed tension limiting plate includes a limiting plate body, and at least one strand through-hole is provided on the limiting plate body; counter bores are provided at positions on the limiting plate body corresponding to the wire inlet sides of the respective strand through-holes, and auxiliary clamping clips are provided in the counter bores. The auxiliary clamping clip includes a housing that is in clearance fit with the counter bore and a plurality of clamping bodies provided in the housing. A through-hole corresponding to the strand through-hole is provided at the center of the housing, the clamping bodies are arranged around the through-hole, an elastic structure for clamping the clamping bodies together is provided between the clamping bodies and the housing, reverse teeth for allowing the strand to pass through unidirectionally are provided on the clamping surfaces of the clamping bodies, both end faces of the housing are planes, and the thickness of the auxiliary clamping clip is the same as the depth of the counter bore.

[0007] Optionally, there are two clamping bodies in total. Radial guide grooves are provided in the housing, the elastic structure is a spring provided in the guide grooves, and the clamping bodies are arranged in the guide grooves and are pressed by the spring.

[0008] Optionally, a fixing column is provided in the housing, the axial direction of the fixing column is parallel to the axial direction of the through-hole, fixing holes are provided on the clamping bodies, the clamping bodies are constrained on the fixing column through the fixing holes and take the fixing column as a rotation axis, the elastic structure is a torsion spring sleeved on the fixing column, and the two torsion arms of the torsion spring are respectively placed on the bearing columns provided on the clamping bodies and in the housing.

[0009] As can be seen from the above description, the beneficial effects of the technical solution of the present invention are as follows:

[0010] In the present invention, a counterbore is provided on the wire-passing side of the perforation of the limit plate, and an auxiliary clip is provided in the counterbore. When tensioning and jacking, the working anchor wedges are driven by the steel strand to abut against the outer end face of the auxiliary clip. When the tension is unloaded, the auxiliary clip and the working anchor wedges retract together with the steel strand. Since the end face of the auxiliary clip is a flat surface, it can flatten the two split wedges of the working anchor, so that the working anchor wedges can be kept as aligned as possible after retraction.

[0011] The present invention has a clever concept and can greatly reduce the potential safety hazards in the tensioning operation, which is an important improvement over the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to describe this patent more clearly, one or more drawings are provided below.

[0013] Figure 1 is a reference diagram of the use state of the present invention;

[0014] Figure 2 is a schematic structural diagram of a prestressed tensioning limit plate in an embodiment of the present invention;

[0015] Figure 3 is another schematic structural diagram of a prestressed tensioning limit plate in an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] For the convenience of those skilled in the art to understand the technical solution of this patent, the technical solution of this patent will be further described below in the form of specific cases.

[0017] As Figure 1 shown, a prestressed tensioning limit plate includes a limit plate body 2, and at least one wire perforation 21 is provided on the limit plate body 2; counterbores are provided on the limit plate body at positions corresponding to the wire-passing sides of the respective wire perforations, and an auxiliary clip 1 is provided in each counterbore. The auxiliary clip 1 includes a housing that is in clearance fit with the counterbore and a plurality of clip bodies provided in the housing. A through hole corresponding to the wire perforation is provided in the center of the housing, the clip bodies are arranged around the through hole, an elastic structure for clamping the clip bodies together is provided between the clip bodies and the housing, reverse teeth for allowing the wire to pass through unidirectionally are provided on the clamping surfaces of the clip bodies, both end faces of the housing are flat surfaces, and the thickness of the auxiliary clip is the same as the depth of the counterbore.

[0018] Optionally, as Figure 2As shown, there are two clamping bodies 121 in total. A radial guide groove 14 is provided in the outer shell 11. The elastic structure is a spring 131 arranged in the guide groove 14. The clamping body 121 is arranged in the guide groove 14 and is pressed by the spring 131.

[0019] Optionally, as Figure 3 As shown, there are three clamping bodies 122 in total. A fixed column 15 is provided in the outer shell 11. The axial direction of the fixed column 15 is parallel to the axial direction of the through hole 10. The clamping body 122 has a fixing hole. The clamping body 122 is constrained on the fixed column 15 through the fixing hole and takes the fixed column 15 as a rotation axis. The elastic structure is a torsion spring 132 sleeved on the fixed column 15. The two torsion arms of the torsion spring 132 are respectively placed on the bearing columns 162 and 161 arranged on the clamping body and in the outer shell.

[0020] As Figure 1 As shown, during use, the auxiliary clamp 1 is placed in the counterbore of the limit plate body 2. The steel strand passes through the working anchor 3, the auxiliary clamp 1 and the strand through hole of the limit plate body 2 in sequence, and it is ensured that the working anchor 3 is embedded in the rabbet of the limit plate. When the tensioning jack advances, the working anchor gripper 31 abuts against the outer end face of the auxiliary clamp 1 driven by the steel strand. When the tensioning force is unloaded, the auxiliary clamp 1 and the working anchor gripper 31 retract together with the steel strand. Since the end face of the auxiliary clamp is a plane, it can level the two split grippers of the working anchor, so that the working anchor grippers can be kept as aligned as possible after retraction, greatly reducing the safety hazards in the tensioning operation.

[0021] It should be noted that the above specific implementation manners are only specific examples of the implementation solutions of this patent, and do not cover all implementation manners of this patent, nor can they be regarded as a limitation on the protection scope of this patent; all implementation solutions that belong to the same concept as the above cases, or combination solutions of the above several solutions, are within the protection scope of this patent.

Claims

1. A prestressed tension limiting plate, comprising a limiting plate body, and at least one strand perforation is provided on the limiting plate body; characterized in that: On the limiting plate body, counter bores are provided at positions corresponding to the wire inlet sides of each wire perforation. An auxiliary clamp is provided in each counter bore. The auxiliary clamp includes a housing that is in clearance fit with the counter bore and a plurality of clamping bodies provided in the housing. A through hole corresponding to the wire perforation is provided at the center of the housing. The clamping bodies are arranged around the through hole. An elastic structure for clamping the clamping bodies together is provided between the clamping bodies and the housing. Inverted teeth for allowing the wire to pass through unidirectionally are provided on the clamping surfaces of the clamping bodies. Both end faces of the housing are flat surfaces, and the thickness of the auxiliary clamp is the same as the depth of the counter bore.

2. The prestressed tension limiting plate according to claim 1, wherein: There are two clamping bodies in total. Radial guide grooves are provided in the housing. The elastic structure is a spring provided in the guide grooves. The clamping bodies are arranged in the guide grooves and are pressed by the springs.

3. The prestressed tension limiting plate according to claim 1, wherein: Fixed columns are provided in the housing. The axial direction of the fixed columns is parallel to the axial direction of the through hole. The clamping bodies have fixing holes. The clamping bodies are constrained on the fixed columns through the fixing holes and rotate around the fixed columns. The elastic structure is a torsion spring sleeved on the fixed columns. The two torsion arms of the torsion spring respectively rest on the bearing columns provided on the clamping bodies and in the housing.

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