A double-hole opening anchorage device suitable for parallel-bundling prestressed tendons

Abstract

The application relates to a double-hole opening anchor suitable for parallel-bundling prestressed tendons, and relates to the technical field of prestressed steel strand anchoring in unbonded prestressed structure reconstruction construction of buildings, which comprises a gasket, a lower semi-cylinder, an upper semi-cylinder, a cutting mechanism and a fastening mechanism. The fastening mechanism can start an electric push rod, then drive a pressing plate to move along the semi-ring hole in the vertical direction to the steel strand direction until the pressing plate is closely attached to the surface of the steel strand, and then the four semi-ring holes can form a closed double-hole channel, so that the two steel strands are respectively arranged in independent holes and no misalignment phenomenon occurs. The structure breaks through the limitation of the traditional single-hole anchor through the four semi-ring holes, realizes the effect of synchronous independent anchoring of the two parallel-bundling steel strands, and eliminates the uneven stress problem caused by single operation. Meanwhile, the cooperation of the electric push rod and the pressing plate achieves the purpose of flexible adjustment according to the specifications of the steel strand.

Description

Technical Field

[0001] This application relates to the field of prestressed steel strand anchorage technology in the construction of unbonded prestressed structures, and in particular to a double-hole open anchorage suitable for bundled prestressed tendons. Background Technology

[0002] Currently, due to the characteristics of unbonded prestressed steel strands, it is necessary to first use open anchors to clamp the prestressed steel strands before cutting and re-tensioning can be carried out.

[0003] Regarding the aforementioned technologies, existing methods often result in prestressed steel bars being bundled together within the opening area when creating openings in unbonded prestressed concrete slabs. Furthermore, it is impossible to anchor, tension, and cut the bundled steel strands. Additionally, it is impossible to install open anchorages when two steel strands are bundled together. Moreover, there is a drawback that the fastening and cutting devices cannot be adjusted in real time according to the specifications of the steel strands, which greatly increases the limitations of the device and brings many inconveniences to its use. Utility Model Content

[0004] The purpose of this application is to provide a double-hole open anchorage suitable for bundled prestressed tendons, which has the advantages of simultaneous processing and flexible adjustment of bundled steel strands, and solves the problems mentioned in the background art.

[0005] The technical solution provided in this application for a double-hole open anchorage suitable for prestressed tendons is as follows: it includes a gasket, a lower half-cylinder, an upper half-cylinder, a cutting mechanism, and a fastening mechanism. The fastening mechanism includes several vertical plates fixedly connected to the bottom of the inner wall of the lower half-cylinder and the top of the inner wall of the upper half-cylinder. The surfaces of the several sets of vertical plates are fixedly connected with four semi-annular holes. An electric push rod is fixedly installed on the surface of the semi-annular holes. One end of the electric push rod is fixedly connected to a pressure plate. The cutting mechanism includes a housing fixedly connected to the bottom of the lower half-cylinder. A drive motor is fixedly mounted on the side of the housing via a mounting plate. Bearings are fixedly connected to both sides of the inner wall of the housing. A rotating shaft is rotatably connected inside each of the two bearings. One end of one of the rotating shafts is fixedly connected to the output shaft of the drive motor. A threaded rod is fixedly connected to one end of each of the two rotating shafts. A movable plate is threadedly connected to the surface of the threaded rod. Two support plates are fixedly connected to the top of the movable plate. Two horizontal plates are fixedly connected to the sides of the two support plates. A hydraulic cylinder is fixedly installed inside the horizontal plate. A cutting blade is fixedly connected to the hydraulic rod of the hydraulic cylinder. Two displacement sensors are provided on the side of one of the horizontal plates. By adopting the above technical solution and setting a fastening mechanism, the electric push rod can be activated, which then drives the pressure plate to move vertically along the semi-circular hole towards the steel strand until the pressure plate is tightly attached to the surface of the steel strand. Subsequently, the setting of four semi-circular holes can form a closed double-hole channel, ensuring that the two steel strands are in independent hole positions without misalignment. This structure, through four semi-circular holes, breaks through the limitations of traditional single-hole anchors and achieves the effect of synchronous independent anchoring of two bundled steel strands, eliminating the problem of uneven force caused by single-strand operation. At the same time, the cooperation between the electric push rod and the pressure plate achieves the purpose of flexible adjustment according to the specifications of the steel strands. By setting up a cutting mechanism, the drive motor can be started, and its output shaft will drive the rotating shaft to rotate. The rotating shaft will then drive the threaded rod to rotate, which will cause the threaded moving plate to adjust left and right, adjusting the position of the cutting blade until the cutting blade is aligned with the cutting position of the steel strand. At the same time, the displacement sensor can monitor the distance between the cutting blade and the steel strand in real time to ensure positioning accuracy. After confirmation, the hydraulic cylinder is activated, and the hydraulic rod will push the cutting blade towards the steel strand to complete the synchronous cutting of the two bundled steel strands. This structure not only improves cutting efficiency but also effectively avoids errors that may be caused by manual operation. The cooperation between the hydraulic cylinder and the hydraulic rod ensures that the cutting blade has sufficient stability and force during the advancement process, thereby achieving a precise cutting effect on the steel strand. In addition, the setting of displacement sensor, drive motor and moving plate enhances the intelligence level of the overall structure, enabling it to flexibly adapt to different working conditions, meet diverse construction needs, and ensure the safety, reliability and flexibility of the cutting process.

[0006] Preferably, a lower half-cylinder is fixedly connected to the side of the gasket, and an upper half-cylinder overlaps the top of the lower half-cylinder. Four annular hoops are fitted on the surfaces of the lower and upper half-cylinders, and two screws are threaded into the interior of each set of annular hoops. By adopting the above technical solution and setting a combination structure of ring hoop and screw, the connection between the lower half-cylinder and the upper half-cylinder can be effectively enhanced, thereby improving the stability of the overall structure. In actual use, this design not only facilitates quick installation and disassembly, but also allows for adjustment of the tightness according to specific needs, ensuring the reliable performance of the anchor in high-intensity working environments.

[0007] Preferably, the surfaces of the upper half-cylinder and the lower half-cylinder are provided with a stainless steel layer; By adopting the above technical solution and setting a stainless steel layer, the corrosion resistance of the upper and lower half cylinders can be enhanced, reducing the risk of structural damage caused by environmental factors. In practical engineering applications, this design is particularly suitable for construction environments with high humidity or strong corrosion, and can improve the overall performance and stability of the anchor.

[0008] Preferably, the surface of the pressure plate is provided with a rough layer; By adopting the above technical solution and setting a rough layer, the friction between the pressure plate and the contact surface can be increased, thereby effectively preventing slippage caused by uneven force during tensioning.

[0009] Preferably, a baffle is fixedly installed on the top of the box body by studs, and two elongated holes are respectively opened on the top surface of the baffle and are slidably connected to the support plate; By adopting the above technical solution and setting up a baffle, the studs can be turned, which facilitates the later maintenance of the components inside the box. The elongated hole can ensure the stability of the baffle while providing the necessary sliding space for the support plate.

[0010] Preferably, two auxiliary rods are fixedly connected to the inner wall side of the box, and the movable plate is slidably connected to the surface of the auxiliary rods; By adopting the above technical solution and setting up auxiliary rods, a stable sliding path can be provided for the moving plate.

[0011] Preferably, the surface of the gasket is provided with a silicone pad; By adopting the above technical solution and setting up a silicone pad, the buffering performance between the pad and the contact surface can be effectively increased, while improving the overall sealing performance of the structure, preventing loosening caused by long-term use or vibration, and enhancing the stability and reliability of equipment operation.

[0012] Preferably, the surface of the gasket is fixedly connected to two fixing blocks, and the fixing blocks are internally threaded with bolts; By adopting the above technical solution and setting bolts and fixing blocks, the connection between the gasket and the contact surface can be strengthened, while facilitating quick disassembly and adjustment when needed.

[0013] In summary, this application includes at least one of the following beneficial technical effects: This double-hole anchorage, suitable for prestressed tendons bundled together, features a fastening mechanism that activates an electric push rod. This push rod moves a pressure plate vertically along the semi-annular holes towards the steel strands until the pressure plate is tightly fitted against the surface of the steel strands. The four semi-annular holes create a closed double-hole channel, ensuring that the two steel strands are in independent positions without misalignment. This structure overcomes the limitations of traditional single-hole anchorages, achieving simultaneous and independent anchoring of two bundled steel strands, eliminating the uneven stress caused by single-strand operation. Furthermore, the coordination between the electric push rod and the pressure plate allows for flexible adjustment based on the specifications of the steel strands.

[0014] This double-hole anchorage, suitable for prestressed tendons in parallel strands, features a cutting mechanism. A drive motor is activated, its output shaft rotates a rotating shaft, which in turn rotates a threaded rod. This allows a moving plate connected to the threaded connection to adjust the cutting blade's position until it aligns with the cutting point of the steel strand. Simultaneously, a displacement sensor monitors the distance between the cutting blade and the steel strand in real time, ensuring positioning accuracy. Once confirmed, a hydraulic cylinder is activated, and the hydraulic rod pushes the cutting blade towards the steel strand, simultaneously cutting the two parallel strands. This structure not only improves cutting efficiency but also effectively avoids errors that may arise from manual operation. The coordinated use of the hydraulic cylinder and hydraulic rod ensures sufficient stability and force for the cutting blade during its advancement, achieving precise cutting of the steel strand. Furthermore, the placement of the displacement sensor, drive motor, and moving plate enhances the overall structure's intelligence, enabling it to adapt flexibly to different working conditions, meet diverse construction needs, and ensure the safety, reliability, and flexibility of the cutting process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall front view structure of this application; Figure 2 This is a schematic diagram of the overall and partial exploded view of this application; Figure 3 This is a side view of the fastening mechanism in this application; Figure 4 This is a front view structural diagram of the cutting mechanism in this application; Figure 5 This is a top view of the cutting mechanism in this application; Figure 6 for Figure 1 Schematic diagram of the side view structure of the middle gasket; Figure 7 for Figure 1 A top-view schematic diagram of the upper-middle semi-cylinder structure.

[0016] In the picture: 1. Gasket; 2. Lower half-cylinder; 3. Upper half-cylinder; 4. Ring hoop; 5. Screw; 6. Cutting mechanism; 601. Housing; 602. Support plate; 603. Horizontal plate; 604. Hydraulic cylinder; 605. Hydraulic rod; 606. Cutting blade; 607. Displacement sensor; 608. Drive motor; 609. Bearing; 610. Rotating shaft; 611. Threaded rod; 612. Moving plate; 7. Stainless steel layer; 8. Fastening mechanism; 801. Vertical plate; 802. Semi-annular hole; 803. Electric push rod; 804. Pressure plate; 9. Rough layer; 10. Baffle; 11. Auxiliary rod; 12. Silicone pad; 13. Fixing block; 14. Bolt; 15. Long hole. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1 -Appendix Figure 7 This application will be described in further detail below.

[0018] Example 1: A double-hole open anchorage suitable for tandem prestressed tendons, referring to... Figure 1 , Figure 3 , Figure 4 and Figure 5 It includes a gasket 1, a lower half-cylinder 2, an upper half-cylinder 3, a cutting mechanism 6, and a fastening mechanism 8. The fastening mechanism 8 includes several vertical plates 801 fixedly connected to the bottom of the inner wall of the lower half-cylinder 2 and the top of the inner wall of the upper half-cylinder 3. The surfaces of the several sets of vertical plates 801 are fixedly connected to four semi-annular holes 802. An electric push rod 803 is fixedly installed on the surface of the semi-annular holes 802. One end of the electric push rod 803 is fixedly connected to a pressure plate 804. The cutting mechanism 6 includes a housing 601 fixedly connected to the bottom of the lower half-cylinder 2. A drive motor 608 is fixedly mounted on the side of the housing 601 via a mounting plate. Bearings 609 are fixedly connected to both sides of the inner wall of the housing 601. A rotating shaft 610 is rotatably connected inside each of the two bearings 609. One end of one of the rotating shafts 610 is fixedly connected to the output shaft of the drive motor 608. A threaded rod 611 is fixedly connected to one end of both rotating shafts 610. A movable plate 612 is threadedly connected to the surface of the threaded rod 611. Two support plates 602 are fixedly connected to the top of the movable plate 612. Two horizontal plates 603 are fixedly connected to the sides of the two support plates 602. A hydraulic cylinder 604 is fixedly installed inside the horizontal plate 603. A cutting rod 605 of the hydraulic cylinder 604 is fixedly connected to a cutting... The cutter 606 has two displacement sensors 607 on the side of one of its horizontal plates 603. By setting a fastening mechanism 8, the electric push rod 803 can be activated, which then drives the pressure plate 804 to move vertically along the semi-annular hole 802 towards the steel strand until the pressure plate 804 is tightly attached to the surface of the steel strand. Subsequently, the four semi-annular holes 802 form a closed double-hole channel, ensuring that the two steel strands are in independent hole positions without misalignment. This structure, through the four semi-annular holes 802, breaks through the limitations of traditional single-hole anchors and achieves the effect of synchronous independent anchoring of two bundled steel strands, eliminating the problem of uneven force caused by single-strand operation. At the same time, the cooperation between the electric push rod 803 and the pressure plate 804 achieves the purpose of flexible adjustment according to the specifications of the steel strand. By setting the cutting mechanism 6, the drive motor 608 can be started, and its output shaft will drive the rotating shaft 610 to rotate. Then, the rotating shaft 610 will drive the threaded rod 611 to rotate, which will cause the threaded moving plate 612 to be adjusted left and right to adjust the position of the cutting blade 606 until the cutting blade 606 is aligned with the cutting position of the steel strand. At the same time, the displacement sensor 607 can monitor the distance between the cutting blade 606 and the steel strand in real time to ensure positioning accuracy. After the positioning is completed, the hydraulic cylinder 604 is started, and then the hydraulic rod 605 will push the cutting blade 606 to move towards the steel strand, completing the cutting of two bundled steel strands. The synchronous cutting structure not only improves cutting efficiency but also effectively avoids errors that may be caused by manual operation. At the same time, the coordinated use of hydraulic cylinder 604 and hydraulic rod 605 ensures that the cutting blade 606 has sufficient stability and force during the advancement process, thereby achieving the effect of precise cutting of steel strand. In addition, the setting of displacement sensor 607, drive motor 608 and moving plate 612 enhances the intelligence level of the overall structure, enabling it to flexibly adapt to different working conditions, meet diverse construction needs, and ensure the safety, reliability and flexibility of the cutting process.

[0019] Please see Figure 2 and Figure 6 The lower half-cylinder 2 is fixedly connected to the side of the gasket 1, and the upper half-cylinder 3 overlaps the top of the lower half-cylinder 2. Four annular hoops 4 are fitted on the surfaces of the lower half-cylinder 2 and the upper half-cylinder 3. Two screws 5 are threaded into the interior of each set of annular hoops 4. By setting the combination structure of annular hoops 4 and screws 5, the connection tightness between the lower half-cylinder 2 and the upper half-cylinder 3 can be effectively enhanced, thereby improving the stability of the overall structure. In actual use, this design not only facilitates quick installation and disassembly, but also allows for adjustment of the tightness according to specific needs, ensuring the reliable performance of the anchor in high-intensity working environments. The surfaces of the upper half-cylinder 3 and the lower half-cylinder 2 are provided with a stainless steel layer 7. By setting the stainless steel layer 7, the corrosion resistance of the upper half-cylinder 3 and the lower half-cylinder 2 can be enhanced, reducing the risk of structural damage caused by environmental factors. In practical engineering applications, this design is particularly suitable for construction environments with high humidity or strong corrosion, and can improve the overall performance and stability of the anchor.

[0020] Please see Figure 3 and Figure 4The surface of the pressure plate 804 is provided with a rough layer 9. By providing the rough layer 9, the friction between the pressure plate 804 and the contact surface can be increased, thereby effectively preventing the sliding phenomenon caused by uneven force during tensioning. The top of the box 601 is fixedly installed with a baffle 10 by studs. Two elongated holes 15 are opened on the top surface of the baffle 10, which are respectively slidably connected to the support plate 602. By setting the baffle 10, the studs can be turned, which facilitates the later maintenance of the components inside the box 601. The elongated holes 15 can provide the necessary sliding space for the support plate 602 while ensuring the stability of the baffle 10.

[0021] Please see Figure 5 and Figure 7 Two auxiliary rods 11 are fixedly connected to the inner wall side of the housing 601. The moving plate 612 is slidably connected to the surface of the auxiliary rods 11. By setting the auxiliary rods 11, a stable sliding path can be provided for the moving plate 612. A silicone pad 12 is provided on the surface of the gasket 1. By setting the silicone pad 12, the buffering performance between the gasket 1 and the contact surface can be effectively increased, while improving the sealing performance of the overall structure and preventing loosening caused by long-term use or vibration. This enhances the stability and reliability of the equipment operation. Two fixing blocks 13 are fixedly connected to the surface of the gasket 1. Bolts 14 are threaded inside the fixing blocks 13. By setting the bolts 14 and fixing blocks 13, the connection between the gasket 1 and the contact surface can be strengthened, and it is also convenient to quickly disassemble and adjust when needed.

[0022] The implementation principle of this application embodiment is as follows: First, the initial fixing and assembly of the anchor is completed. The gasket 1 is attached to the preset construction position of the floor slab in advance. Then, the gasket 1 is fastened to the pre-embedded connecting parts of the floor slab through the bolts 14 in the fixing block 13 on the surface of the gasket 1 to ensure that the gasket 1 is installed stably. Then, the two prestressed tendons that need to be treated are respectively placed into the semi-annular holes 802 on the inner wall of the lower half cylinder 2. Then, the upper half cylinder 3 is fastened on the lower half cylinder 2 so that the semi-annular holes 802 of the upper half cylinder 3 and the lower half cylinder 2 are aligned to form a complete double hole channel. Finally, four annular hoops 4 are fitted on the surface of the upper half cylinder 3 and the lower half cylinder 2. The two screws 5 in each set of annular hoops 4 are tightened to achieve a tight connection between the upper half cylinder 3 and the lower half cylinder 2, and the assembly and initial fixing of the anchor are completed. Then, the fastening mechanism 8 is activated to anchor the prestressed tendons. The electric push rod 803 on the bottom of the inner wall of the lower half-cylinder 2 and the top of the inner wall of the upper half-cylinder 3 is activated in advance. Then, the electric push rod 803 pushes the pressure plate 804 to move vertically along the semi-annular hole 802 towards the steel strand until the rough layer 9 on the surface of the pressure plate 804 is tightly attached to the surface of the steel strand. At the same time, the friction increased by the rough layer 9 and the thrust of the electric push rod 803 lock the two prestressed tendons in the double hole channel respectively, realizing synchronous independent anchoring and avoiding slippage or misalignment of the steel strand in subsequent operations. Subsequently, the external tensioning equipment is activated to tension the two parallel prestressing tendons to the appropriate position. Then, the cutting mechanism 6 is activated to precisely cut the tensioned parallel prestressing tendons. At this time, the drive motor 608 on the side of the box 601 can be activated. Then, its output shaft will drive the rotating shaft 610 to rotate. Then, the rotating shaft 610 will drive the threaded rod 611 to rotate. Then, the moving plate 612 threaded to the threaded rod 611 slides along the auxiliary rod 11 on the inner wall of the box 601, thereby adjusting the position of the horizontal plate 603 connected to the top support plate 602 of the moving plate 612 until the cutting blade 606 on the horizontal plate 603 is aligned with the position where the steel strand needs to be cut. During the cutting, the distance between the cutting blade 606 and the steel strand can be monitored in real time by the two displacement sensors 607 on the side of the horizontal plate 603 to ensure positioning accuracy. Afterwards, the cutting of the steel strand and the resetting of the cutting mechanism 6 are completed. After the cutting blade 606 is accurately positioned, the hydraulic cylinder 604 inside the horizontal plate 603 is activated. Then, the hydraulic cylinder 604 pushes the hydraulic rod 605 to extend. Subsequently, the hydraulic rod 605 drives the cutting blade 606 to move towards the steel strand, completing the synchronous cutting of the two parallel prestressed tendons. After the cutting is completed, the hydraulic cylinder 604 is controlled to drive the hydraulic rod 605 and the cutting blade 606 to reset. Then, the drive motor 608 is started to run in reverse, driving the threaded rod 611 to rotate in reverse, so that the moving plate 612 slides back to the initial position along the auxiliary rod 11. The drive motor 608 is then turned off, and the cutting operation is completed. Finally, after the anchorage is disassembled and cleaned, the screws 5 on the ring hoop 4 are unscrewed after the cutting operation is completed. Then, the four ring hoop 4 are removed, and the upper half cylinder 3 is separated. After that, the anchorage is removed from the floor slab. Then, the bolts 14 on the fixing block 13 of the gasket 1 are unscrewed, the gasket 1 is removed, and finally, the cutting debris and impurities on the surface of the anchorage in the construction area are cleaned up. This completes the entire process of treating the prestressed tendons and provides conditions for the subsequent concrete pouring process for sealing the floor slab opening.

Claims

1. A double-hole open anchorage suitable for prestressed tendons, comprising a gasket (1), a lower half-cylinder (2), an upper half-cylinder (3), a cutting mechanism (6), and a fastening mechanism (8), characterized in that: The fastening mechanism (8) includes several vertical plates (801) fixedly connected to the bottom of the inner wall of the lower half cylinder (2) and the top of the inner wall of the upper half cylinder (3). The surfaces of the several sets of vertical plates (801) are fixedly connected with four semi-annular holes (802). An electric push rod (803) is fixedly installed on the surface of the semi-annular holes (802). One end of the electric push rod (803) is fixedly connected with a pressure plate (804). The cutting mechanism (6) includes a housing (601) fixedly connected to the bottom of the lower half-cylinder (2). A drive motor (608) is fixedly mounted on the side of the housing (601) via a mounting plate. Bearings (609) are fixedly connected to both sides of the inner wall of the housing (601). A rotating shaft (610) is rotatably connected inside each of the two bearings (609). One end of one of the rotating shafts (610) is fixedly connected to the output shaft of the drive motor (608). A threaded rod (610) is fixedly connected to one end of each of the two rotating shafts (610). 11) The threaded rod (611) is threadedly connected to a movable plate (612). The top of the movable plate (612) is fixedly connected to two support plates (602). The sides of the two support plates (602) are fixedly connected to two horizontal plates (603). A hydraulic cylinder (604) is fixedly installed inside the horizontal plate (603). The hydraulic rod (605) of the hydraulic cylinder (604) is fixedly connected to a cutting blade (606). Two displacement sensors (607) are provided on the side of one of the horizontal plates (603).

2. A double-hole open anchorage suitable for tandem prestressed tendons according to claim 1, characterized in that: The side of the gasket (1) is fixedly connected to the lower half cylinder (2), and the top of the lower half cylinder (2) is overlapped with the upper half cylinder (3). The surfaces of the lower half cylinder (2) and the upper half cylinder (3) are fitted with four annular hoops (4), and the interior of the two sets of annular hoops (4) are threaded with two screws (5).

3. A double-hole open anchorage suitable for tandem prestressed tendons according to claim 1, characterized in that: The surfaces of the upper half-cylinder (3) and the lower half-cylinder (2) are provided with stainless steel layers (7).

4. A double-hole open anchorage suitable for tandem prestressed tendons according to claim 1, characterized in that: The surface of the pressure plate (804) is provided with a rough layer (9).

5. A double-hole open anchorage suitable for tandem prestressed tendons according to claim 1, characterized in that: The top of the box (601) is fixedly installed with a baffle (10) by studs. Two elongated holes (15) are opened on the top surface of the baffle (10) and are respectively slidably connected to the support plate (602).

6. A double-hole open anchorage suitable for tandem prestressed tendons according to claim 1, characterized in that: Two auxiliary rods (11) are fixedly connected to the inner wall side of the box (601), and the movable plate (612) is slidably connected to the surface of the auxiliary rods (11).

7. A double-hole open anchorage suitable for tandem prestressed tendons according to claim 1, characterized in that: The surface of the gasket (1) is provided with a silicone pad (12).

8. A double-hole open anchorage suitable for tandem prestressed tendons according to claim 1, characterized in that: The surface of the gasket (1) is fixedly connected to two fixing blocks (13), and the internal threads of the fixing blocks (13) are connected to bolts (14).

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