Jacking and fixing device of prestress jack

Abstract

The utility model relates to the technical field of jacking and fixing of jacks, in particular to a jacking and fixing device of a prestress jack, which comprises a first sleeve sleeved on the top of the jack in a threaded mode, a second sleeve is movably sleeved in the first sleeve, a single-hole anchor is installed in the second sleeve in a threaded mode, and an inner cavity of the single-hole anchor is of a conical groove-shaped structure. A plurality of clamping pieces are movably sleeved with the single-hole anchor and arranged in the second sleeve at equal intervals in the circumferential direction of an inner cavity of the second sleeve, and the outer shape of each clamping piece is matched with the structure of the inner cavity of the single-hole anchor. The utility model provides a jacking and fixing device of a pre-stressed jack, which is convenient for pre-stressed operation in various environments, avoids the influence of shaking of pre-stressed tendons on an anchorage device, and is used for overcoming the defects in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of jacking technology, specifically to a jacking device for a prestressed jack. Background Technology

[0002] A prestressed jack is a hydraulic jack specifically designed for applying prestress. During use, this type of jack must work in close coordination with a high-pressure oil pump to ensure sufficient power support for tensioning and retraction operations. The prestressed jack's structural design includes a central through-hole along its core axis. This through-hole allows prestressing tendons such as steel strands and reinforcing bars to pass through smoothly. When the high-pressure oil pump supplies high-pressure oil to the jack, this oil is converted into a powerful tension force through the jack's internal hydraulic system. Using this tension force, the prestressed jack applies the necessary stress to the prestressing tendons, thus achieving tensioning. After the prestressing tendons are tensioned to the desired degree, anchorages are used to secure them, ensuring the prestress is stably maintained on the tendons. Through this operational process, the prestressed jack completes the prestressing application process.

[0003] Applying stress using prestressing jacks is a crucial step in prestressing tendon tensioning. Effective anchoring is essential to ensure the prestressed tendons maintain the applied stress after tensioning. Anchoring primarily relies on tools such as anchor plates, anchor rings, and wedges to secure the tendons. However, in situations with limited space or complex structures, it's difficult to use anchor plates to limit the anchor rings, hindering prestressing operations. Furthermore, over time, factors like wind can cause prestressed tendons to sway, leading to loosening of the anchorages and altering the applied stress, thus affecting the tendons' performance. Given these issues, improvements to the prestressing jack's anchoring mechanism are urgently needed. Facilitating prestressing operations in various environments and preventing tendon swaying from affecting the anchorages is of paramount importance for enhancing the value and reliability of prestressing jacks in practical engineering applications. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides a prestressing jacking device that facilitates prestressing operations in various environments and avoids the impact of prestressing tendon swaying on anchorages, thereby overcoming the deficiencies in existing technologies.

[0005] The technical solution adopted by this utility model is as follows: a jacking device for a prestressed jack, including a first sleeve with a threaded top of the jack, a second sleeve movably fitted inside the first sleeve, a single-hole anchor threaded inside the second sleeve, the inner cavity of the single-hole anchor adopting a conical groove structure, and a number of clamping pieces movably fitted inside the single-hole anchor, the number of clamping pieces being equally spaced along the circumferential direction of the inner cavity of the second sleeve, the external shape of the clamping pieces matching the inner cavity structure of the single-hole anchor.

[0006] Preferably, a first retaining ring is provided at the end of the first sleeve furthest from the jack. The first retaining ring and the first sleeve are integrally formed. The inner diameter of the first retaining ring is not greater than the inner diameter of the first sleeve. The outer diameter of the second sleeve matches the inner diameter of the first retaining ring. A second retaining ring is provided inside the first sleeve and is fitted onto one end of the second sleeve. The second retaining ring and the second sleeve are integrally formed.

[0007] Preferably, the first sleeve has several through holes on the side away from the jack, and the several through holes are evenly distributed on one side of the first sleeve along the circumference.

[0008] Preferably, a pressure ring is provided between the jack and the clamping plate, with both sides of the pressure ring contacting the clamping plate and the jack, respectively.

[0009] Preferably, the jack has a fixing groove at one end near the clamping plate, and one side of the pressure ring is movably fitted into the fixing groove, with the outer wall diameter of the pressure ring matching the inner cavity diameter of the fixing groove.

[0010] Preferably, the inner diameter of the pressure ring is not less than the inner diameter of the clamping piece, and the centerline of the pressure ring is on the same axis as the centerline of the single-hole anchor and the first sleeve.

[0011] Preferably, the outer wall of the single-hole anchor is provided with a threaded groove, and the single-hole anchor is threadedly connected to the second sleeve through the threaded groove. A locking sleeve is fitted inside the threaded groove, and the locking sleeve is threadedly fitted onto the single-hole anchor.

[0012] The beneficial effects of this utility model are as follows: First, by using a first and second sleeve, the single-hole anchor is assembled onto the jack, and the single-hole anchor also limits the positioning of the clamping plates. This allows the jack to push several clamping plates to compress the prestressing tendons, facilitating anchoring and enabling prestressing operations in various environments. Simultaneously, the first sleeve precisely limits the pushing movement of the second sleeve, single-hole anchor, and clamping plates, facilitating rapid assembly of these components. This design significantly improves assembly efficiency and ensures the stability of the jack during the pushing process. This stability is crucial for prestressing jacks in various situations, not only improving operational efficiency but also greatly enhancing operational safety.

[0013] Secondly, this invention uses a first retaining ring to constrain the movement of the second sleeve, and a second retaining ring to limit the movement distance of the second sleeve, preventing it from moving out of the first sleeve. Furthermore, the through-hole in the first sleeve facilitates maintaining consistent air pressure between the inner and outer surfaces of the first sleeve, preventing air pressure from affecting the jacking operation of the prestressed jack.

[0014] Furthermore, this invention uses a pressure ring instead of a clamping plate to contact the jack, preventing stress concentration at the contact point and thus avoiding damage, thereby extending the jack's service life. A fixing groove on the jack prevents the pressure ring from wobbling, improving its stability. Additionally, a locking sleeve constrains the clamping plate inside the single-hole anchor, preventing it from loosening during use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a sectional perspective view of the present invention.

[0017] Figure 3 This is an exploded view of the assembly of this utility model.

[0018] Figure 4 This is a schematic diagram of the assembly of the present invention with a jack.

[0019] Figure 5 This is a cross-sectional perspective view of the present invention and the jack.

[0020] Figure 6 This is an exploded view of the assembly of the single-hole anchor and locking sleeve in this utility model. Detailed Implementation

[0021] like Figures 1 to 6 As shown, a prestressed jack fixing device includes a first sleeve 2 threaded onto the top of the jack 1. A second sleeve 3 is movably fitted inside the first sleeve 2. A single-hole anchor 4 is threaded into the second sleeve 3. The inner cavity of the single-hole anchor 4 has a conical groove structure. Several clamping pieces 5 are movably fitted inside the single-hole anchor 4. The clamping pieces 5 are evenly spaced along the circumference of the inner cavity of the second sleeve 3. The external shape of the clamping pieces 5 matches the inner cavity structure of the single-hole anchor 4, so as to limit the clamping pieces 5 with the single-hole anchor 4. The jack 1 pushes the clamping pieces 5 to compress the prestressing tendons, thereby facilitating the anchoring of the prestressing tendons and enabling prestressing operations in various environments. Furthermore, the first sleeve 2 constrains the movement of the second sleeve 3 to reduce shaking during the jacking process, thereby maintaining the stable use of the jack 1 and ensuring that the prestressed jack can complete prestressing operations efficiently and safely in various situations.

[0022] In this embodiment, a first retaining ring 6 is provided at the end of the first sleeve 2 away from the jack 1. The first retaining ring 6 and the first sleeve 2 are integrally formed. The inner diameter of the first retaining ring 6 is not greater than the inner diameter of the first sleeve 2. The outer diameter of the second sleeve 3 matches the inner diameter of the first retaining ring 6 to facilitate the constraint of the movement of the second sleeve 3. A second retaining ring 7 is provided inside the first sleeve 2. The second retaining ring 7 is fitted onto one end of the second sleeve 3. The second retaining ring 7 and the second sleeve 3 are integrally formed. Thus, the first retaining ring 6 and the second retaining ring 7 are used to limit the movement distance of the second sleeve 3 to prevent the second sleeve 3 from moving out of the first sleeve 2.

[0023] Specifically, the first sleeve 2 has several through holes 8 on the side away from the jack 1. The several through holes 8 are evenly distributed on one side of the first sleeve 2 along the circumference of the first sleeve 2, so as to control the air pressure inside the first sleeve 2 and the air pressure outside the first sleeve 2 to keep them consistent, so as to avoid the air pressure affecting the jacking operation.

[0024] In this embodiment, a pressure ring 9 is provided between the jack 1 and the clamping plate 5. The two sides of the pressure ring 9 are in contact with the clamping plate 5 and the jack 1 respectively, thereby limiting the clamping plate 5 by the pressure ring 9. The pressure ring 9 replaces the clamping plate 5 in contacting the pushing end of the jack 1, thereby increasing the contact area of ​​the jack 1, preventing stress concentration at the contact point of the jack 1, avoiding damage to the contact point of the jack 1, and thus improving the service life of the jack 1.

[0025] Please refer to it again. Figure 5The jack 1 has a fixing groove 10 at one end near the clamping plate 5. One side of the pressure ring 9 is movably fitted into the fixing groove 10. The outer diameter of the pressure ring 9 matches the inner diameter of the fixing groove 10, thereby limiting the pressure ring 9 to prevent it from shaking and improving the stability of the pressure ring 9 in use.

[0026] In this embodiment, the inner diameter of the pressure ring 9 is not less than the inner diameter of the clamping piece 5, so as to facilitate the prestressing tendon to pass through the inner cavity of the pressure ring 9. The center line of the pressure ring 9 is on the same axis as the center line of the single-hole anchor 4 and the first sleeve 2, so as to facilitate the application of stress to the prestressing tendon.

[0027] Please refer to it again. Figure 6 The single-hole anchor 4 has a threaded groove on its outer wall. The single-hole anchor 4 is threadedly connected to the second sleeve 3 through the threaded groove. A locking sleeve 11 is fitted inside the threaded groove. The locking sleeve 11 adopts a circular barrel structure with one side open. The locking sleeve 11 is threadedly fitted onto the single-hole anchor 4. One side of the locking sleeve 11 is in contact with the clamping piece 5. The locking sleeve 11 is used as an auxiliary measure to prevent the clamping piece 5 from loosening, and to prevent the prestressing tendon from shaking, which would cause the clamping piece 11 to shake out of the single-hole anchor 4, so as to solve the problem of the clamping piece 11 loosening.

[0028] The instructions for using this product are as follows: Figures 1 to 6As shown, firstly, the high-pressure oil pump is connected to the jack 1 via an oil supply pipe to provide power to the jack 1. During the connection process, ensure that the oil supply pipe connection is secure and sealed to prevent oil leakage during operation. Next, the single-hole anchor 4 is threaded into the second sleeve 3, and the second sleeve 3 is threaded into the first sleeve 1, so that one side of the second sleeve 3 protrudes from the first retaining ring 6. The single-hole anchor 4 is then fitted onto the prestressing tendon that requires stress application. Then, several clamping pieces 5 are fitted onto the prestressing tendon, so that the clamping pieces 5 are located within the single-hole anchor 4. The pressure ring 9 is then placed in the fixing groove 10, and the jack 1 and pressure ring 9 are fitted onto the prestressing tendon, so that the first sleeve 1 is threaded onto the cylinder of the jack, thus completing the assembly operation. Next, by controlling the main cylinder inlet valve of the high-pressure oil pump, pressurized oil is added to jack 1 to push the top of jack 1 to apply stress to the prestressing tendon and push the pressure ring 9 to squeeze and limit the clamping plate 5. This anchors the prestressing tendon with the help of the single-hole anchor 4 and the clamping plate 5, ensuring the stability of the jacking operation. Finally, the main cylinder inlet valve is closed, and the auxiliary cylinder inlet valve is opened, allowing the pressurized oil in jack 1 to enter the auxiliary cylinder through the auxiliary cylinder nozzle. After the main and auxiliary cylinders return to their pre-tensioning positions, the second sleeve 3 is removed from the single-hole anchor 4, facilitating repeated tensioning. Furthermore, it should be noted that to prevent the clamping plate 11 from slipping out of the single-hole anchor 4 due to prestressing tendon swaying, after removing the second sleeve 3 from the single-hole anchor 4, the locking sleeve 11 should be screwed onto the single-hole anchor 4 to limit the clamping plate 5 within the single-hole anchor 4, thus preventing the clamping plate 11 from loosening.

[0029] In this embodiment, the first sleeve 2 and the second sleeve 3 are used to assemble the single-hole anchor 4 onto the jack 1. The single-hole anchor 4 also limits the positioning of the clamping pieces 5. By using the jack 1 to push several clamping pieces 5, the prestressing tendons are compressed, facilitating anchoring and enabling prestressing operations in various environments. Simultaneously, the first sleeve 2 precisely limits the pushing movement of the second sleeve 3, the single-hole anchor 4, and the clamping pieces 5, facilitating rapid assembly of these components. This design significantly improves assembly efficiency and ensures the stability of the jack 1 during the pushing process. This stability is crucial for prestressing operations in various situations, improving both efficiency and safety.

[0030] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A jacking device for a prestressed jack, comprising a first sleeve (2) threaded onto the top of the jack (1), characterized in that: The first sleeve (2) is fitted with a second sleeve (3), and a single-hole anchor (4) is threaded inside the second sleeve (3). The inner cavity of the single-hole anchor (4) adopts a conical groove structure. Several clamping pieces (5) are fitted inside the single-hole anchor (4). The clamping pieces (5) are evenly spaced along the circumferential direction of the inner cavity of the second sleeve (3). The external shape of the clamping pieces (5) matches the inner cavity structure of the single-hole anchor (4).

2. The jacking device for the prestressed jack according to claim 1, characterized in that: The first sleeve (2) is provided with a first retaining ring (6) at the end away from the jack (1). The first retaining ring (6) and the first sleeve (2) are an integral structure. The inner diameter of the first retaining ring (6) is not greater than the inner diameter of the first sleeve (2). The outer diameter of the second sleeve (3) matches the inner diameter of the first retaining ring (6). A second retaining ring (7) is provided inside the first sleeve (2). The second retaining ring (7) is fitted on one end of the second sleeve (3). The second retaining ring (7) and the second sleeve (3) are an integral structure.

3. The jacking device for the prestressed jack according to claim 1, characterized in that: The first sleeve (2) has several through holes (8) on the side away from the jack (1). The several through holes (8) are evenly distributed on one side of the first sleeve (2) along the circumference.

4. The jacking device for the prestressed jack according to claim 1, characterized in that: A pressure ring (9) is provided between the jack (1) and the clamp (5), and the two sides of the pressure ring (9) are in contact with the clamp (5) and the jack (1) respectively.

5. The jacking device for the prestressed jack according to claim 4, characterized in that: The jack (1) has a fixed groove (10) at one end near the clamp (5), and one side of the pressure ring (9) is movably fitted into the fixed groove (10). The outer diameter of the pressure ring (9) matches the inner diameter of the fixed groove (10).

6. The jacking device for the prestressed jack according to claim 4, characterized in that: The inner diameter of the pressure ring (9) is not less than the inner diameter of the clamping piece (5). The center line of the pressure ring (9) is on the same axis as the center line of the single-hole anchor (4) and the first sleeve (2).

7. The jacking device for a prestressed jack according to claim 1, characterized in that: The outer wall of the single-hole anchor (4) is provided with a threaded groove, and the single-hole anchor (4) is threadedly connected to the second sleeve (3) through the threaded groove. A locking sleeve (11) is fitted inside the threaded groove, and the locking sleeve (11) is threadedly fitted on the single-hole anchor (4).

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