Tensioning anti-extraction anchorage

Abstract

The utility model relates to pre -stressed anchorage device technical field discloses a kind of tensioning anti -drop anchorage devices, including anchor ring, the outside coaxial of anchor ring is provided with positioning ring, positioning block is arranged on the outer sidewall of positioning ring, the positioning block is provided with multiple, and it is interval setting along the circumferential direction of the positioning block;The utility model can provide stable auxiliary positioning for anchor ring in observation stage, by supplementing the positioning constraint between anchor ring and reserved hole, avoid anchor ring and pop out due to steel strand deformation displacement, to eliminate the security risk in construction process, guarantee the overall safety and reliability of precast beam body tensioning operation.

Description

Technical Field

[0001] This utility model relates to the field of prestressed anchorage technology, and in particular to a tensioning anti-derailment anchorage. Background Technology

[0002] In bridges, rail transit, and building construction, precast beams are widely used in various load-bearing structural systems due to their advantages such as high construction efficiency and strong structural stability. During the production and processing of precast beams, the tensioning and anchoring of the steel strands is the core process that determines the beam's load-bearing capacity and service life. As a key fixing component after the steel strands are tensioned, the installation stability of the anchor directly affects the structural safety of the entire precast beam. In existing technologies, when tensioning steel strands in precast beams, pre-drilled holes for anchor installation are typically made inside the beam. After the steel strands are threaded through, anchor rings are embedded in the pre-drilled holes, and a pre-set tension is applied to the steel strands using tensioning equipment, causing elastic deformation to provide prestress. Once the tensioning operation meets design requirements, excess steel strands extending beyond the anchor ring end face must be trimmed to avoid affecting subsequent construction or the beam's appearance. Simultaneously, to ensure the quality of steel strand tensioning, the industry generally requires observation of the stress stability of the steel strands for a period after trimming, focusing on monitoring for any backward displacement caused by stress relaxation or anchorage failure. This observation period typically lasts from several hours to several days. However, during the observation phase after the steel strands were cut, the pre-drilled holes for installing the anchor rings remained exposed and were not sealed using methods such as concrete grouting. During this period, the steel strands may deform and shift to some extent due to material properties, deviations in tension stress control, or wear at the anchorage contact interface. Since the anchor rings and pre-drilled holes are only indirectly fixed by the tension of the steel strands, lacking a dedicated auxiliary positioning structure, when the steel strands shift backward, the anchor rings will lose stable support and are highly susceptible to detaching from or even popping out of the pre-drilled holes. Once the anchor rings pop out, the prestressed energy they carry will be released instantly, potentially damaging the pre-drilled holes in the precast beams and posing a serious personal safety threat to construction workers conducting observation, recording, and equipment debugging work nearby, creating a significant safety hazard. Therefore, in response to the problem that anchor rings are prone to popping out during the period when the pre-reserved holes are exposed after the existing precast beam steel strand tensioning, there is an urgent need for a tensioning anti-detachment anchor that can provide stable auxiliary positioning for the anchor rings during the observation stage. By supplementing the positioning constraints between the anchor rings and the pre-reserved holes, the anchor rings are prevented from popping out due to the deformation and displacement of the steel strands, thereby eliminating safety risks during construction and ensuring the overall safety and reliability of the precast beam tensioning operation. Utility Model Content

[0003] The purpose of this invention is to provide a tensioning anti-detachment anchor that can provide stable auxiliary positioning for the anchor ring during the observation stage. By supplementing the positioning constraint between the anchor ring and the reserved hole, it prevents the anchor ring from popping out due to the deformation and displacement of the steel strand, thereby eliminating safety risks during construction and ensuring the overall safety and reliability of the precast beam tensioning operation.

[0004] The present invention adopts the following technical solution: A tension anti-derailment anchor includes an anchor ring, a positioning ring coaxially disposed on the outside of the anchor ring, and a positioning block disposed on the outer sidewall of the positioning ring. Multiple positioning blocks are disposed and spaced apart along the circumferential direction of the positioning blocks.

[0005] Preferably, the positioning block has an arc-shaped structure.

[0006] Preferably, the positioning block gradually decreases in height from one end to the other along the axial direction of the positioning ring.

[0007] Preferably, the top of the positioning block is provided with an anti-slip strip.

[0008] Preferably, the positioning ring and the anchor ring are detachably connected.

[0009] Preferably, the positioning ring and the anchor ring are detachably connected.

[0010] Preferably, a connecting plate is provided on the contacting end face of the upper and lower sections of the positioning ring, and the two connecting plates are connected by bolts.

[0011] Preferably, on the opposite end faces of the two connecting plates on each side, one is provided with a limiting block and the other is provided with a limiting groove. A sealing plate is provided at the end where the limiting block is provided. After the limiting block is fully inserted into the limiting groove, the sealing plate seals the end of the limiting groove.

[0012] Preferably, the bolt passes through the sealing plate and is threaded to the side wall of the connecting plate on both sides of the limiting groove.

[0013] Preferably, the outer end of the limiting ring is provided with an annular baffle, the annular baffle is integrally formed with the positioning ring, and the inner diameter of the annular baffle is smaller than the diameter of the anchor ring.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: By coaxially setting a positioning ring on the outside of the anchor ring and arranging multiple positioning blocks at intervals along the circumferential direction on the side wall of the positioning ring, the positioning blocks can form a stable mechanical interlocking structure with the inner wall of the hole after the anchor ring is embedded in the pre-reserved hole of the precast beam. This structure supplements the positioning constraint between the anchor ring and the pre-reserved hole, changing the method of indirect fixation relying solely on the tension of the steel strand in the prior art. It can effectively prevent the anchor ring from falling out or even popping out when the steel strand moves backward due to stress relaxation, anchorage failure, etc., fundamentally solving the problem of the anchor ring easily popping out during the observation stage.

[0015] This invention, through the synergistic action of the positioning ring and the positioning block, can stably confine the anchor ring within the pre-reserved hole, preventing damage to the hole caused by the instantaneous release of prestress energy when the anchor ring pops out, and eliminating threats to the personal safety of surrounding construction personnel. This safety feature allows for observation operations after the steel strand is cut in a safer environment, reducing safety hazards during construction and meeting the safety specifications for engineering construction. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of this application; Figure 2 This is a schematic diagram of the positioning ring structure in an embodiment of this application; Figure 3 This is a schematic diagram of the connecting plate in an embodiment of this application. Detailed Implementation

[0017] The present invention will now be described clearly and completely with reference to the accompanying drawings and embodiments: like Figures 1 to 3As shown, the tension anti-derailment anchorage of this utility model includes an anchor ring 1, and a positioning ring 2 coaxially arranged on the outside of the anchor ring 1. The axial length of the positioning ring 2 is not greater than the axial length of the anchor ring 1, ensuring positioning and fixing while reducing material consumption, thereby reducing costs. Positioning blocks 3 are arranged on the outer sidewall of the positioning ring 2, with multiple positioning blocks 3 spaced apart along the circumference of the positioning blocks 3. The design of the positioning blocks 3 spaced apart along the circumference of the positioning ring 2 ensures that the anchor ring 1 is subjected to uniform force within the hole, avoiding tilting or displacement of the anchor ring 1 due to excessive local force, thus ensuring the structural stability of the anchor ring 1 during the observation stage and before subsequent grouting operations. Simultaneously, the stable positioning state of the anchor ring 1 provides a more reliable basis for monitoring the stress stability of the steel strand, helping to accurately determine the tensioning quality and ensuring the load-bearing performance and service life of the precast beam. This utility model achieves the anti-derailment function simply by adding a positioning ring 2 and positioning blocks 3 to the outside of the anchor ring 1. The overall structure is simple, requiring no complex additional equipment or control system, and is easy to manufacture, install, and maintain. The number and size of the positioning blocks 3 can be adapted to the actual parameters of the reserved holes, making them suitable for tensioning operations of precast beams of different specifications and highly practical.

[0018] Furthermore, the positioning block 3 is preferably configured with an arc-shaped structure. This arc-shaped design allows for a closer and more intimate contact with the inner wall of the pre-drilled circular hole at the end of the precast beam. The arc-shaped structure maximizes the contact area between the positioning block 3 and the inner wall of the hole, resulting in a more uniform and smooth force transfer between them. Simultaneously, it effectively disperses the localized stress generated in the anchor ring 1 during the stress process, preventing damage to the inner wall of the hole or deformation of the positioning block 3 due to stress concentration at the contact point. This further enhances the positioning stability of the anchor ring 1 within the pre-drilled hole, ensuring that the anchor ring 1 remains firmly installed during the observation phase where displacement of the steel strand may occur.

[0019] Furthermore, the positioning block 3 gradually decreases in height from one end to the other along the axial direction of the positioning ring 2. The higher part of the positioning block 3 can form a solid contact support point with the inner wall of the reserved hole, ensuring that when the steel strand may shift, the reaction force on the anchor ring 1 can be effectively transmitted to the inner wall of the hole through the higher positioning block 3, giving full play to the anti-displacement function of the positioning block 3 and ensuring the stable stress state of the anchor ring 1 during the observation stage. During installation, the gradually decreasing height of the installation blocks forms a natural guide slope. When the positioning ring 2 and positioning block 3 are installed into the circular hole, the lower positioning block 3 can smoothly enter the hole first. As the installation progresses, the higher positioning block 3 gradually slides in along the slope and fits against the inner wall of the hole, effectively reducing the hard collision and frictional resistance between the positioning block 3 and the inner wall of the hole during the installation process, significantly reducing the installation difficulty, making the entire installation operation smoother and more efficient, and achieving an organic unity of stress reliability and installation convenience.

[0020] In addition, in this embodiment, each positioning block 3 is also provided with an anti-slip strip 4 on its top. The anti-slip strip 4 on the top of the positioning block 3 significantly increases the friction between the positioning block 3 and the inner wall of the pre-reserved hole in the precast beam. When the positioning block 3 fits against the inner wall of the hole through its arc-shaped structure and achieves stable installation with a gradual height design, the anti-slip strip 4 further strengthens the tightness of their contact. If the steel strand may shift backward and cause the anchor ring 1 to tend to come off, the anti-slip strip 4 can effectively prevent the relative sliding between the positioning block 3 and the inner wall of the hole by increasing the frictional resistance, making the constraint effect of the positioning block 3 on the anchor ring 1 more reliable.

[0021] Furthermore, the positioning ring 2 and the anchor ring 1 are detachably connected for easy installation and use. Preferably, the positioning ring 2 is a split structure consisting of an upper section and a lower section. In practical applications, the anchor ring 1 can be first fitted onto the outside of the steel strand and placed inside the hole at the end of the precast beam. Then, the two parts of the positioning ring 2 can be gradually moved to the positioning ring 2 for installation, which can reduce the installation difficulty and reduce the mutual wear between the positioning block 3 and the hole during the installation process. Preferably, a connecting plate 5 is provided on the contacting end faces of the upper and lower sections of the positioning ring 2, and the two connecting plates 5 are connected by bolts. Specifically, on the opposite end faces of the two connecting plates 5 on each side, one is provided with a limiting block 6 and the other is provided with a limiting groove 7. The limiting block 6 slides within the limiting groove 7, and a sealing plate 8 is provided at one end where the limiting block 6 is located. After the limiting block 6 is fully inserted into the limiting groove 7, the sealing plate 8 seals the end of the limiting groove 7. The sealing plate 8 is located at the higher end of the top of the positioning block 3, that is, it is set to face outward during installation. The bolt passes through the sealing plate 8 and is threaded to the side wall of the connecting plate 5 on both sides of the limiting groove 7. This makes it easy to tighten the bolt from the end. In other words, the setting direction of the bolt is parallel to the axis of the reserved hole at the end of the precast beam. This facilitates operation and avoids the problem of narrow operating space caused by the bolt being arranged radially along the hole.

[0022] Furthermore, in this embodiment, an annular baffle 9 is provided at the outer end of the limiting ring. The annular baffle 9 is integrally formed with the positioning ring 2, and the inner diameter of the annular baffle 9 is smaller than the diameter of the anchor ring 1. When the steel strand retracts and exerts an outward pulling force on the anchor ring 1, the annular baffle 9 can directly bear the axial force of the anchor ring 1, effectively preventing the anchor ring 1 from coming out of the positioning ring 2, further improving the anti-loosening reliability of the entire anchor structure. At the same time, the integrally formed design ensures the connection strength between the annular baffle 9 and the positioning ring 2, avoiding the limiting failure problem caused by assembly gaps or loose connections, and enhancing the stability and durability of the structure.

[0023] In use, this invention first installs the anchor ring 1 into the pre-drilled hole, passes the steel strand through the anchor hole of the anchor ring 1, and installs a clamping piece in the anchor hole outside the steel strand. Then, the two separate positioning rings 2 are moved sequentially to the position of the anchor ring 1. Using a tool, the positioning rings 2 are tapped, causing the limiting block 6 to gradually slide into the limiting groove 7, completing the installation of the two separate positioning rings 2. Finally, bolts are used for tightening. The structure is simple, the operation is convenient, and it effectively ensures the stability of the anchor ring 1 and guarantees construction safety.

Claims

1. A tensioned anti-derailment anchor, characterized in that: The device includes an anchor ring, a positioning ring coaxially disposed on the outside of the anchor ring, and a positioning block disposed on the outer sidewall of the positioning ring. Multiple positioning blocks are disposed and spaced apart along the circumferential direction of the positioning blocks.

2. The tensioned anti-derailment anchorage according to claim 1, characterized in that: The positioning block has an arc-shaped structure.

3. The tensioned anti-derailment anchorage according to claim 2, characterized in that: The height of the positioning block gradually decreases from one end to the other along the axial direction of the positioning ring.

4. The tensioned anti-derailment anchorage according to claim 3, characterized in that: The top of the positioning block is provided with an anti-slip strip.

5. The tensioned anti-derailment anchorage according to any one of claims 1-4, characterized in that: The positioning ring and the anchor ring are detachably connected.

6. The tensioned anti-derailment anchorage according to claim 5, characterized in that: The positioning ring is a split structure consisting of an upper section and a lower section connected together.

7. The tensioned anti-derailment anchorage according to claim 6, characterized in that: The upper and lower sections of the positioning ring are each provided with a connecting plate on their contacting end faces, and the two connecting plates are connected by bolts.

8. The tensioned anti-derailment anchorage according to claim 7, characterized in that: On each of the two connecting plates, one end face is provided with a limiting block and the other end face is provided with a limiting groove. The end of the limiting block is provided with a sealing plate. After the limiting block is fully inserted into the limiting groove, the sealing plate seals the end of the limiting groove.

9. The tensioned anti-derailment anchorage according to claim 8, characterized in that: The bolts pass through the sealing plate and are threadedly connected to the side walls of the connecting plates on both sides of the limiting groove.

10. The tensioned anti-derailment anchorage according to claim 1, characterized in that: The positioning ring has an annular baffle at one of its outer ends. The annular baffle is integrally formed with the positioning ring, and the inner diameter of the annular baffle is smaller than the diameter of the anchor ring.

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