Prestressed tendon extrusion sleeve

Abstract

This utility model discloses a prestressed tendon extrusion sleeve, relating to the field of steel strand anchor technology. It comprises a small-diameter cylindrical section and a large-diameter cylindrical section coaxially connected. The large-diameter cylindrical section has a blind hole arranged along its axial direction, and the small-diameter cylindrical section has a through hole arranged along its axial direction and communicating with the blind hole. Compared with the prior art, this utility model provides a prestressed tendon extrusion sleeve that can improve corrosion resistance and anchorage reliability.

Description

Technical Field

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

[0002] The extrusion sleeve is a key component for anchoring prestressing tendons, used to achieve reliable anchoring and improve structural performance. Through an extrusion process, the extrusion sleeve tightly bonds with the prestressing tendon, causing plastic deformation of the inner wall of the sleeve. This tightly "bites" the grooves or spiral ribs on the surface of the steel strand, forming mechanical interlocking and frictional forces. This anchoring force effectively resists slippage of the prestressing tendon during tensioning or long-term use, ensuring reliable transmission of prestress to the concrete structure. Existing extrusion sleeves are typically cylindrical, with the prestressing tendon passing through a through-hole inside the cylinder. This structure exposes the ends of the prestressing tendon, making them susceptible to corrosion from water and oxygen, leading to steel strand decay. Furthermore, traditional extrusion sleeves are relatively short, only 55 mm to 60 mm in length, limiting the contact length with the prestressing tendon after extrusion and making it difficult to withstand large tensile forces. In addition, the anti-corrosion measures for extrusion sleeves are insufficient, and long-term use may lead to reduced anchoring performance due to corrosion. Therefore, an improved extrusion sleeve structure is needed to enhance corrosion resistance and anchoring reliability. Utility Model Content

[0003] The purpose of this invention is to provide a prestressed tendon extrusion sleeve that can improve corrosion resistance and anchoring reliability.

[0004] To solve the above problems, the technical solution adopted by this utility model is: this prestressed tendon extrusion sleeve includes a small-diameter cylindrical section and a large-diameter cylindrical section coaxially connected. The large-diameter cylindrical section has a blind hole arranged along its axial direction, and the small-diameter cylindrical section has a through hole arranged along its axial direction and connected to the blind hole.

[0005] A more specific technical solution than the above-mentioned technical solution is that one end of the large-diameter cylindrical segment is connected to the small-diameter cylindrical segment through a transition cone.

[0006] Furthermore, the connection between the through hole and the blind hole is provided with a threaded structure.

[0007] Furthermore, a removable anti-corrosion sleeve is connected to the threaded structure.

[0008] Furthermore, the axial length of the smaller diameter cylindrical segment plus the axial length of the larger diameter cylindrical segment is not less than 75 mm.

[0009] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0010] Because this invention uses a blind hole structure, the ends of the prestressing tendons are located inside the extrusion sleeve, which provides corrosion and sun protection, making the steel strands less prone to decay and thus improving anchoring reliability. The extrusion sleeve has a threaded structure, and the anti-corrosion sleeve can be connected to this threaded structure through the external thread, which not only enhances the anti-corrosion effect of this invention but also facilitates disassembly. This invention also extends the length of the extrusion sleeve, thereby deepening the depth of the through holes and blind holes, making the extrusion length between the extrusion sleeve and the prestressing tendons longer, allowing it to withstand greater tensile force and strengthening anchoring reliability. Attached Figure Description

[0011] Figure 1 This is the outline drawing of this utility model;

[0012] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0013] Figure 3 This is a three-dimensional structural diagram of the present invention. Detailed Implementation

[0014] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model; however, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0015] like Figures 1 to 3 The prestressed tendon extrusion sleeve shown includes a small-diameter cylindrical section 1 and a large-diameter cylindrical section 2 coaxially connected. The large-diameter cylindrical section 2 has a blind hole 2-1 arranged along its axial direction inside, and the small-diameter cylindrical section 1 has a through hole 1-1 arranged along its axial direction and connected to the blind hole 2-1 inside.

[0016] One end of the large-diameter cylindrical segment 2 is connected to the small-diameter cylindrical segment 1 through a transition cone 2-2.

[0017] A threaded structure 3 is provided at the connection between the through hole 1-1 and the blind hole 2-1, and a detachable anti-corrosion sleeve is connected to the threaded structure 3.

[0018] The axial length of the smaller diameter cylindrical segment 1 is L1, and the axial length of the larger diameter cylindrical segment 2 is L2, where L1 + L2 ≥ 75 mm.

[0019] The present invention is fitted onto the prestressing tendon, with the end of the prestressing tendon located in the blind hole 2-1 of the large-diameter cylindrical section 2. Then, cold extrusion is performed using equipment to ensure that the present invention is tightly bonded to the prestressing tendon.

[0020] Because this invention uses a blind hole structure, the ends of the prestressing tendons are located inside the extrusion sleeve, which provides corrosion and sun protection, making the steel strands less prone to decay and thus improving anchoring reliability. The extrusion sleeve has a threaded structure, and the anti-corrosion sleeve can be connected to this threaded structure through the external thread, which not only enhances the anti-corrosion effect of this invention but also facilitates disassembly. This invention also extends the length of the extrusion sleeve, thereby deepening the depth of the through holes and blind holes, making the extrusion length between the extrusion sleeve and the prestressing tendons longer, allowing it to withstand greater tensile force and strengthening anchoring reliability.

Claims

1. A prestressed tendon extrusion sleeve, characterized in that: It includes a small-diameter cylindrical segment and a large-diameter cylindrical segment connected coaxially. The large-diameter cylindrical segment has a blind hole arranged along its axial direction, and the small-diameter cylindrical segment has a through hole arranged along its axial direction and communicating with the blind hole.

2. The prestressed tendon extrusion sleeve according to claim 1, characterized in that: One end of the large-diameter cylindrical section is connected to the small-diameter cylindrical section via a transition cone.

3. The prestressed tendon extrusion sleeve according to claim 1 or 2, characterized in that: The connection between the through hole and the blind hole is provided with a threaded structure.

4. The prestressed tendon extrusion sleeve according to claim 3, characterized in that: A removable anti-corrosion sleeve is connected to the threaded structure.

5. The prestressed tendon extrusion sleeve according to claim 4, characterized in that: The sum of the axial length of the smaller diameter cylindrical segment and the axial length of the larger diameter cylindrical segment shall not be less than 75 mm.

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