A prestressed tensioning and pulling-up take-up device

Abstract

The present application relates to the field of bridge construction, specifically a prestressed tension traction tightening device, comprising a tension traction assembly for tension traction of steel strand on a cast wall, the cast wall being cast on both sides of the bridge, the tension traction assembly being composed of a first anchor plate, a jack and a second anchor plate, the first anchor plate, the jack and the second anchor plate being sequentially sleeved on the outside of the steel strand outside the cast wall, a plurality of clamping pieces being provided between the second anchor plate and the steel strand, and the second anchor plate being fixed on the steel strand under the action of each clamping piece. The prestressed tension traction tightening device of the present application simultaneously performs the operation of prestressed tension traction tightening of the steel strand through the tension traction assembly, and cuts the steel strand after the operation of prestressed tension traction tightening through the rotating cutting blade, and in the process of cutting, the cutting length of the steel strand is accurately controlled through the control assembly, thereby ensuring the structural stability of the bridge.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, specifically a prestressed tensioning and tightening device. Background Technology

[0002] During bridge construction, the steel strands of the cast-in-place walls on both sides of the bridge are pulled by prestressed tensioning and tightening equipment. This causes the bridge components to generate opposite stresses under load, thereby offsetting the stress generated by the external load and reducing the required strength of the bridge components. This method can effectively improve the load-bearing capacity of the bridge, enabling it to withstand greater loads and ensuring the safety of the bridge in use. At the same time, the prestressed tensioning construction method can also improve the stability of the bridge.

[0003] During the prestressing tensioning of steel strands, the length of the steel strands will change. The excess length of the steel strands needs to be cut off. However, it is not convenient to directly control the length of the cut steel strands. If the length of the cut steel strands is not properly controlled, it may lead to uneven stress on the steel strands and affect the structural stability of the bridge. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a prestressed tensioning and tightening device.

[0005] The technical solution adopted by this invention to solve its technical problem is: a prestressed tensioning and tightening device, including a tensioning assembly for tensioning steel strands on a cast-in-place wall. The cast-in-place wall is constructed on both sides of a bridge. The tensioning assembly consists of a first anchor plate, a jack, and a second anchor plate. The first anchor plate, the jack, and the second anchor plate are sequentially sleeved on the outside of the steel strands located outside the cast-in-place wall. Multiple clamps are provided between the second anchor plate and the steel strands, and the second anchor plate is fixed to the steel strands under the action of each clamp. An L-shaped frame is fixed to the outside of the jack, and a first strip plate is fixed to one end of the L-shaped frame. A [missing information - likely a design feature] is provided above the first strip plate. There is a second strip plate. Between the first and second strip plates, there is a lifting assembly for raising and lowering the L-shaped frame and a first guide assembly for guiding during the raising and lowering process. A U-shaped frame is fixed to the upper end of the second strip plate. An installation assembly for fixing the U-shaped frame to the guardrail on the bridge is provided. A liquid supply assembly for supplying liquid to the inside of the jack is provided on one side of the U-shaped frame. A transmission plate is provided on one side of the L-shaped frame. A moving assembly for moving the transmission plate and a second guide assembly for guiding during the moving process are provided on the L-shaped frame. A cutting assembly for cutting the pre-tensioned steel strand and a control assembly for controlling the cutting length during the cutting process are provided on the transmission plate.

[0006] The cutting assembly includes a mounting bracket disposed on one side of the transmission plate. The mounting bracket is connected to the transmission plate via a connecting assembly. A cutting blade is rotatably connected to the mounting bracket, and a drive motor for rotating the cutting blade is mounted on the mounting bracket.

[0007] The connecting assembly includes a plurality of T-shaped rods slidably connected to the mounting bracket, one end of each T-shaped rod being fixed to the transmission plate, and a spring being sleeved on the outer side of each T-shaped rod.

[0008] The control component includes a connecting plate disposed on one side of the mounting frame. The connecting plate is fixedly connected to the mounting frame by multiple connecting rods. One end of the connecting plate is fixed with a control plate for abutting against the end of the poured wall. The front end of the control plate is provided with an inclined surface.

[0009] The movable component includes a mounting block fixed to one side of an L-shaped frame. A first threaded rod is rotatably connected to the mounting block. A first threaded tube is threadedly engaged with the first threaded rod. One end of the first threaded tube is fixed to a transmission plate. A first motor for driving the first threaded rod is mounted on one side of the mounting block.

[0010] The second guide assembly includes a first slide rod fixed to one side of the mounting block, a first sleeve slidably connected to the first slide rod, and one end of the first sleeve fixed to the transmission plate.

[0011] The lifting assembly includes a second threaded rod rotatably connected to a second strip plate, a second threaded tube threadedly engaged with the second threaded rod, one end of the second threaded tube being fixed to the upper end of the first strip plate, and a second motor for driving the second threaded rod being mounted on the second strip plate.

[0012] The first guide assembly includes a second slide rod fixed to a second strip plate, a second sleeve slidably connected to the second slide rod, and one end of the second sleeve being fixed to the first strip plate.

[0013] The mounting assembly includes two fixing plates fixed on a U-shaped frame, two clamping plates disposed between the two fixing plates, and a double-ended lead screw rotatably connected between the two fixing plates, with the threads at both ends of the double-ended lead screw having opposite directions. The two clamping plates are respectively engaged with the two ends of the double-ended lead screw. A third motor for driving the double-ended lead screw is mounted on the fixing plates, and a guide rod is slidably connected to the two clamping plates, with the guide rod fixed between the two fixing plates.

[0014] The liquid supply assembly includes a side plate fixed to one side of the U-shaped frame, a hydraulic station installed on the side plate, and a delivery pipe for hydraulic delivery between the hydraulic station and the jack.

[0015] The beneficial effects of this invention are:

[0016] The prestressed tensioning and tightening device of the present invention performs prestressed tensioning and tightening of steel strands through a tensioning and traction assembly, while simultaneously cutting the prestressed tensioned and tightened steel strands with a rotating cutting blade. During the cutting process, the cutting length of the steel strands is precisely controlled by a control assembly to ensure the structural stability of the bridge. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 A schematic diagram of the overall external structure of a prestressed tensioning and traction tightening device provided by the present invention;

[0019] Figure 2 A schematic diagram of the tensioning assembly structure of a prestressed tensioning and traction tightening device provided by the present invention;

[0020] Figure 3 A schematic diagram of the installation components and liquid supply components of a prestressed tensioning and traction tightening device provided by the present invention;

[0021] Figure 4 A schematic diagram of the lifting assembly and the first guide assembly of a prestressed tensioning and traction tightening device provided by the present invention;

[0022] Figure 5 A schematic diagram of the cutting component structure of a prestressed tensioning and tightening device provided by the present invention;

[0023] Figure 6 A schematic diagram of the connecting component, control component, moving component, and second guide component of a prestressed tensioning and traction tightening device provided by the present invention;

[0024] Figure 7 A schematic diagram of the abutting transmission of the control board of a prestressed tensioning and traction tightening device provided by the present invention;

[0025] Figure 8 This is a schematic diagram of the length of the steel strand after cutting in a prestressed tensioning and traction tightening device provided by the present invention.

[0026] In the diagram: 101-Bridge; 102-Cast wall; 103-Steel strand; 201-First anchor plate; 202-Jack; 203-Second anchor plate; 3-L-shaped frame; 4-First strip plate; 5-Second strip plate; 601-Second threaded rod; 602-Second threaded pipe; 603-Second motor; 701-Second sliding rod; 702-Second sleeve; 8-U-shaped frame; 901-Fixing plate; 902-Clamping plate; 903-Double-ended screw; 904-Third motor; 905-Guide rod; 100 1-Side plate; 1002-Hydraulic station; 1003-Conveying pipe; 11-Transmission plate; 1201-Mounting bracket; 1202-Cutting blade; 1203-Drive motor; 1301-T-shaped rod; 1302-Spring; 1401-Connecting plate; 1402-Connecting rod; 1403-Control board; 1404-Inclined surface; 1501-Mounting block; 1502-First threaded rod; 1503-First threaded pipe; 1504-First motor; 1601-First sliding rod; 1602-First sleeve. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are for illustrative purposes only and represent schematic diagrams, not actual pictures, and should not be construed as limiting the present invention. In order to better illustrate the embodiments of the present invention, some components in the figures may be omitted, enlarged, or reduced, and do not represent the actual product size; it is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the figures.

[0028] In the figures of this invention, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figure, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the figures are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above-mentioned terms can be understood according to the specific circumstances.

[0029] like Figure 1-8The present invention discloses a prestressed tensioning and tightening device, comprising a tensioning assembly for tensioning steel strands 103 on a cast-in-place wall 102. The cast-in-place wall 102 is constructed on both sides of a bridge 101. The tensioning assembly consists of a first anchor plate 201, a jack 202, and a second anchor plate 203. The first anchor plate 201, jack 202, and second anchor plate 203 are sequentially fitted onto the outside of the steel strands 103 located outside the cast-in-place wall 102. Multiple clamps are provided between the second anchor plate 203 and the steel strands 103, and the second anchor plate 203 is fixed to the steel strands 103 under the action of the clamps. An L-shaped frame 3 is fixed to the outside of the jack 202. A first strip plate 4 is fixed to one end of the L-shaped frame 3. A second strip plate 5 is provided above the first strip plate 4. A lifting assembly for lifting the L-shaped frame 3 and a first guide for guiding the lifting process are provided between the first strip plate 4 and the second strip plate 5. The upper end of the second strip plate 5 is fixed with a U-shaped frame 8. The U-shaped frame 8 is equipped with an installation component for fixing the guardrail on the bridge 101. One side of the U-shaped frame 8 is equipped with a liquid supply component for supplying liquid to the inside of the jack 202. One side of the L-shaped frame 3 is equipped with a transmission plate 11. The L-shaped frame 3 is equipped with a moving component for moving the transmission plate 11 and a second guiding component for guiding the movement. The transmission plate 11 is equipped with a cutting component for cutting the pre-stressed steel strand 103 and a control component for controlling the cutting length during the cutting process. While the tensioning component is used to perform prestressed tensioning and tightening of the steel strand 103, the rotating cutting blade 1202 cuts the prestressed steel strand 103 after the tensioning and tightening operation. During the cutting process, the cutting length of the steel strand 103 is precisely controlled by the control component to ensure the structural stability of the bridge 101.

[0030] Specifically, the cutting assembly includes a mounting bracket 1201 disposed on one side of the transmission plate 11. The mounting bracket 1201 is connected to the transmission plate 11 via a connecting assembly. A cutting blade 1202 is rotatably connected to the mounting bracket 1201. A drive motor 1203 for driving the rotation of the cutting blade 1202 is mounted on the mounting bracket 1201. The drive motor 1203 drives the cutting blade 1202 to rotate, and the rotating cutting blade 1202 cuts the steel strand 103 after the prestressed tensioning and tightening operation.

[0031] Specifically, the connecting assembly includes multiple T-shaped rods 1301 slidably connected to the mounting bracket 1201. One end of each T-shaped rod 1301 is fixed to the transmission plate 11, and a spring 1302 is sleeved on the outer side of each T-shaped rod 1301. The T-shaped rods 1301 facilitate the sliding connection between the transmission plate 11 and the mounting bracket 1201, and the springs 1302 facilitate the reset movement of the mounting bracket 1201 after movement.

[0032] Specifically, the control assembly includes a connecting plate 1401 disposed on one side of the mounting frame 1201. The connecting plate 1401 is fixedly connected to the mounting frame 1201 via multiple connecting rods 1402. One end of the connecting plate 1401 is fixed with a control plate 1403 for abutting against the end of the cast-in-place wall 102. The front end of the control plate 1403 has an inclined surface 1404. During the movement of the transmission plate 11, the mounting frame 1201 is driven to move synchronously through the connection of the various components on the connecting assembly. During the movement of the mounting frame 1201, the connecting plate 1401 is driven to move synchronously through the connecting rods 1402. During the movement of the connecting plate 1401, the inclined surface 1404 on the control plate 1403 abuts against the corner of the cast-in-place wall 102, driving the connecting plate 1401 and the mounting frame 1201 to move synchronously. The mounting bracket 1201 retracts towards the transmission plate 11. During the retraction process, as the transmission plate 11 and the mounting bracket 1201 continue to move towards the steel strand 103, the retraction movement of the connecting plate 1401 towards the transmission plate 11 and the movement of the connecting plate 1401 towards the steel strand 103 cause one side of the control plate 1403 to abut against one side of the cast wall 102 and slide on one side of the cast wall 102 with the movement of the connecting plate 1401. During the sliding process, the drive motor 1203 drives the cutting blade 1202 to rotate. The rotating cutting blade 1202 cuts the steel strand 103 after the prestressing tensioning and tightening operation. During the cutting process, the length of the cut steel strand 103 is the distance between the cutting blade 1202 and the control plate 1403.

[0033] Specifically, the moving component includes a mounting block 1501 fixed to one side of the L-shaped frame 3. A first threaded rod 1502 is rotatably connected to the mounting block 1501. A first threaded tube 1503 is threadedly engaged with the first threaded rod 1502. One end of the first threaded tube 1503 is fixed to the transmission plate 11. A first motor 1504 for driving the first threaded rod 1502 is mounted on one side of the mounting block 1501. The second guiding component includes a first slide rod 1601 fixed to one side of the mounting block 1501. A sliding connection is made on the first slide rod 1601. A first sleeve 1602 is connected, and one end of the first sleeve 1602 is fixed to the transmission plate 11. The first motor 1504 drives the first threaded rod 1502 to rotate. During the rotation of the first threaded rod 1502, the transmission plate 11 is driven to move through the meshing transmission between the first threaded rod 1502 and the first threaded tube 1503. During the movement of the transmission plate 11, the transmission plate 11 under force moves on one side of the L-shaped frame 3 through the guiding effect of the first sleeve 1602 and the first slide rod 1601.

[0034] Specifically, the lifting assembly includes a second threaded rod 601 rotatably connected to the second strip plate 5, a second threaded tube 602 threadedly engaged with the second threaded rod 601, one end of the second threaded tube 602 fixed to the upper end of the first strip plate 4, and a second motor 603 for driving the second threaded rod 601 mounted on the second strip plate 5; the first guide assembly includes a second slide rod 701 fixed to the second strip plate 5, a second sleeve 702 slidably connected to the second slide rod 701, one end of the second sleeve 702 fixed to the first strip plate 4; the second motor 603 drives the second threaded rod 601 to rotate, and during the rotation of the second threaded rod 601, the first strip plate 4 is driven to move through the mutual meshing transmission between the second threaded rod 601 and the second threaded tube 602; during the movement of the first strip plate 4, the first strip plate 4 and the L-shaped frame 3 are lifted and lowered through the guiding effect of the second sleeve 702 and the second slide rod 701.

[0035] Specifically, the installation assembly includes two fixing plates 901 fixed to the U-shaped frame 8, two clamping plates 902 disposed between the two fixing plates 901, and a double-ended lead screw 903 rotatably connected between the two fixing plates 901, with the threads at both ends of the double-ended lead screw 903 having opposite directions. The two clamping plates 902 are respectively engaged with the two ends of the double-ended lead screw 903. A third motor 904 for driving the double-ended lead screw 903 is mounted on the fixing plates 901, and a guide rod 905 is slidably connected to the two clamping plates 902, with the guide rod 905 fixed between the two fixing plates 901. The U-shaped frame 8 is then secured to the guardrail of the bridge 101. After the operation is completed on both sides, the third motor 904 is started, which drives the double-ended lead screw 903 to rotate. Since the threads at both ends of the double-ended lead screw 903 are set in opposite directions, during the rotation of the double-ended lead screw 903, the two clamping plates 902 are driven to move under force through the mutual meshing transmission between the double-ended lead screw 903 and the two clamping plates 902. During the movement of the two clamping plates 902, the guide rod 905 guides the two clamping plates 902 after being subjected to force to move closer to each other and abut against the two sides of the guardrail of the bridge 101, so that the U-shaped frame 8 is installed and fixed on the bridge 101.

[0036] Specifically, the liquid supply assembly includes a side plate 1001 fixed to one side of the U-shaped frame 8, a hydraulic station 1002 installed on the side plate 1001, and a delivery pipe 1003 for hydraulic delivery between the hydraulic station 1002 and the jack 202; after the U-shaped frame 8 is installed, the delivery pipe 1003 is connected to the jack 202, and the hydraulic station 1002 supplies pressure to the inside of the jack 202.

[0037] Working principle: During the prestressing tensioning and tightening operation of the steel strands 103 on the cast wall 102, the first anchor plate 201, jack 202 and second anchor plate 203 are sequentially sleeved on the steel strands 103 extending from the outside of the cast wall 102. During the sleeved operation, the first anchor plate 201 abuts against the outside of the cast wall 102. During the sleeved installation, multiple clamps are used to fix the sleeved second anchor plate 203 onto the steel strands 103.

[0038] After installing the first anchor plate 201, jack 202, and second anchor plate 203, the U-shaped frame 8 is secured to both sides of the guardrail of bridge 101. After this operation, the third motor 904 is started, driving the double-ended lead screw 903 to rotate. Because the threads at both ends of the double-ended lead screw 903 are set in opposite directions, during its rotation, the double-ended lead screw 903 engages with the two clamping plates 902, causing them to move under force. During this movement, the guide rod 905 guides the two clamping plates 902 to move closer together and abut against both sides of the guardrail of bridge 101, thus fixing the U-shaped frame 8 to bridge 101. After the frame 8 is installed, the delivery pipe 1003 is connected to the jack 202. The hydraulic station 1002 pressurizes the inside of the jack 202. Under the pressure, the second anchor plate 203 is pushed away from the cast wall 102. Due to the interaction between the second anchor plate 203 and the steel strand 103, the movement of the second anchor plate 203 pulls the steel strand 103, which plays the role of prestressing tensioning and tightening of the steel strand 103. During the operation, the lifting component and the first guide component cooperate to drive the L-shaped frame 3 and the entire tensioning component to move up and down. The movement of the tensioning component facilitates the prestressing tensioning and tightening operation of the steel strand 103 at different heights on one side of the cast wall 102.

[0039] After the prestressing tensioning and tightening operation of the steel strand 103 is completed, the transmission plate 11 is driven to move towards the steel strand 103 through the cooperation of the moving component and the second guide component. During the movement of the transmission plate 11, the mounting frame 1201 is driven to move synchronously through the connection of various components on the connecting component. During the movement of the mounting frame 1201, the connecting plate 1401 is driven to move synchronously through the connecting rods 1402. During the movement of the connecting plate 1401, the inclined surface 1404 on the control plate 1403 abuts against the corner of the cast wall 102, driving the connecting plate 1401 and the mounting frame 1201 to move towards the transmission plate 11 in a contraction movement. During the contraction process, as the transmission plate 11 and the mounting frame 1201 continue to move towards the steel strand... The movement of the line 103 is achieved through the contraction movement of the connecting plate 1401 toward the transmission plate 11 and the movement of the connecting plate 1401 toward the steel strand 103. This causes one side of the control plate 1403 to abut against one side of the cast wall 102 and slide along one side of the cast wall 102 as the connecting plate 1401 moves. During the sliding process, the drive motor 1203 drives the cutting blade 1202 to rotate. The rotating cutting blade 1202 cuts the steel strand 103 after the prestressing tensioning and tightening operation. During the cutting process, the length of the steel strand 103 after cutting is the distance between the cutting blade 1202 and the control plate 1403. The cutting length of the steel strand 103 is precisely controlled to ensure the structural stability of the bridge 101.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention. Technical aspects, shapes, and structures not described in detail in this invention are all well-known technologies.

Claims

1. A prestressed tensioning and tightening device, comprising a tensioning assembly for tensioning steel strands (103) on a cast-in-place wall (102), the cast-in-place wall (102) being constructed on both sides of a bridge (101), the tensioning assembly comprising a first anchor plate (201), a jack (202), and a second anchor plate (203), the first anchor plate (201), the jack (202), and the second anchor plate (203) being sequentially sleeved on the outside of the steel strands (103) located outside the cast-in-place wall (102), a plurality of clamps being provided between the second anchor plate (203) and the steel strands (103), and the second anchor plate (203) being fixed to the steel strands (103) under the action of each clamp, characterized in that: An L-shaped frame (3) is fixed to the outside of the jack (202). A first strip plate (4) is fixed to one end of the L-shaped frame (3). A second strip plate (5) is provided above the first strip plate (4). A lifting assembly for raising and lowering the L-shaped frame (3) and a first guide assembly for guiding the movement during the raising and lowering process are provided between the first strip plate (4) and the second strip plate (5). A U-shaped frame (8) is fixed to the upper end of the second strip plate (5). A device for connecting with the bridge (10) is provided on the U-shaped frame (8). 1) The installation components for fixing the upper guardrail are provided. A liquid supply component for supplying liquid to the inside of the jack (202) is provided on one side of the U-shaped frame (8). A transmission plate (11) is provided on one side of the L-shaped frame (3). A moving component for moving the transmission plate (11) and a second guiding component for guiding the movement are provided on the L-shaped frame (3). A cutting component for cutting the pre-tightened steel strand (103) and a control component for controlling the cutting length during the cutting process are provided on the transmission plate (11). The cutting assembly includes a mounting bracket (1201) disposed on one side of the transmission plate (11). The mounting bracket (1201) is connected to the transmission plate (11) via a connecting assembly. A cutting blade (1202) is rotatably connected to the mounting bracket (1201). A drive motor (1203) for rotating the cutting blade (1202) is mounted on the mounting bracket (1201). The connecting assembly includes a plurality of T-shaped rods (1301) slidably connected to the mounting bracket (1201), one end of each T-shaped rod (1301) being fixed to the transmission plate (11), and a spring (1302) being sleeved on the outer side of each T-shaped rod (1301). The control component includes a connecting plate (1401) disposed on one side of the mounting frame (1201). The connecting plate (1401) is fixedly connected to the mounting frame (1201) by a plurality of connecting rods (1402). One end of the connecting plate (1401) is fixed with a control plate (1403) for abutting against the end of the cast wall (102). The front end of the control plate (1403) is provided with a slope (1404).

2. The prestressed tensioning and tightening device according to claim 1, characterized in that: The moving component includes a mounting block (1501) fixed to one side of the L-shaped frame (3), a first threaded rod (1502) rotatably connected to the mounting block (1501), a first threaded tube (1503) threadedly engaged with the first threaded rod (1502), one end of the first threaded tube (1503) being fixed to the transmission plate (11), and a first motor (1504) for driving the first threaded rod (1502) mounted on one side of the mounting block (1501).

3. The prestressed tensioning and tightening device according to claim 2, characterized in that: The second guide assembly includes a first slide rod (1601) fixed to one side of the mounting block (1501), a first sleeve (1602) slidably connected to the first slide rod (1601), and one end of the first sleeve (1602) being fixed to the transmission plate (11).

4. The prestressed tensioning and tightening device according to claim 1, characterized in that: The lifting assembly includes a second threaded rod (601) rotatably connected to the second strip plate (5), a second threaded tube (602) threadedly engaged with the second threaded rod (601), one end of the second threaded tube (602) being fixed to the upper end of the first strip plate (4), and a second motor (603) for driving the second threaded rod (601) is installed on the second strip plate (5).

5. A prestressed tensioning and tightening device according to claim 4, characterized in that: The first guide assembly includes a second slide rod (701) fixed on the second strip plate (5), a second sleeve (702) slidably connected to the second slide rod (701), and one end of the second sleeve (702) being fixed to the first strip plate (4).

6. The prestressed tensioning and tightening device according to claim 1, characterized in that: The mounting assembly includes two fixing plates (901) fixed on a U-shaped frame (8), two clamping plates (902) are provided between the two fixing plates (901), a double-ended lead screw (903) is rotatably connected between the two fixing plates (901), and the threads at both ends of the double-ended lead screw (903) are arranged in opposite directions. The two clamping plates (902) are respectively engaged with the two ends of the double-ended lead screw (903). A third motor (904) for driving the double-ended lead screw (903) is installed on the fixing plate (901), and a guide rod (905) is slidably connected to the two clamping plates (902). The guide rod (905) is fixed between the two fixing plates (901).

7. The prestressed tensioning and tightening device according to claim 1, characterized in that: The liquid supply assembly includes a side plate (1001) fixed to one side of the U-shaped frame (8), a hydraulic station (1002) is installed on the side plate (1001), and a delivery pipe (1003) for hydraulic delivery is provided between the hydraulic station (1002) and the jack (202).

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