Pre-tightening device for assembling anchoring type U rib and using method of pre-tightening device

Abstract

The pre-tightening device comprises pre-tightening devices, a calibration device and a partition plate, the pre-tightening devices are arranged on the two sides of the partition plate in a mirror image mode, each pre-tightening device comprises a hydraulic cylinder, swing arms are symmetrically installed on the two sides of each hydraulic cylinder, the back faces of the swing arms on the two sides face the partition plate respectively, and the calibration device is arranged on the calibration device. A clamping plate is arranged below the hydraulic cylinder, the lower edge of the clamping plate is placed on the top face of the U rib, the two ends of the clamping plate are connected with the swing arms on the corresponding sides respectively, arc-shaped grooves are formed in the lower portions of the opposite sides of the swing arms and formed in the back faces of the swing arms, and crescent plates are installed in the arc-shaped grooves. The pre-tightening device is compact in structural design, reasonable in layout, small in overall size, convenient to carry and suitable for the working condition that the construction space in the partition plate unit is very small; the pre-tightening device adopts an assembly type structure and a modular design, so that quick disassembly and assembly can be realized, and the process requirements of assembling pi-shaped parts are met; the calibration device can detect the clamping efficiency at any time, and the accuracy of the clamping force of the pre-tightening device is guaranteed.

Description

Technical Field

[0001] The invention relates to a pre-tightening device and a use method thereof, and in particular to a pre-tightening device for assembling anchored U-ribs and a use method thereof. Background Art

[0002] As a mature steel structure, orthotropic steel bridge decks are widely used in various types of steel structure bridges. At present, all orthotropic steel bridge decks are welded, that is, U ribs are welded to the steel bridge deck. However, this connection method is prone to fatigue cracking under repeated loads, and the repair cost is high.

[0003] The existing assembled U-rib structure, that is, the U-rib is anchored on the steel bridge deck, and then the U-rib is supported by the π-shaped parts of the partition. However, this type of assembled U-rib structure has not been reported domestically or abroad, and the research on related manufacturing process devices and construction equipment is still blank. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to propose a pre-tightening device for assembling anchored U-ribs and a method of using the same, so as to apply a pre-tightening force to the π-shaped part in the narrow space of the partition unit so that it is completely close to the contact surface of the anchored U-rib, and after the π-shaped part is anchored, a part of the residual internal stress can be retained to ensure the supporting effect of the π-shaped part on the U-rib.

[0005] Technical solution: The present invention includes a pre-tightening device, a calibration device and a partition, wherein the pre-tightening device is mirror-arranged on both sides of the partition, the pre-tightening device includes a hydraulic cylinder, swing arms are symmetrically installed on both sides of the hydraulic cylinder, the backs of the swing arms on both sides are respectively arranged toward the partition, a clamping plate is provided under the hydraulic cylinder, the lower edge of the clamping plate is placed on the top surface of the U-rib, the two ends of the clamping plate are respectively connected to the swing arms on the corresponding side, an arc groove is opened on the lower part of the opposite side of the swing arm, the arc groove is arranged on the back of the swing arm, and a crescent plate is installed in the arc groove.

[0006] The hydraulic cylinder and the clamping plate are respectively hingedly mounted on the front side of the swing arm, so that the hydraulic cylinder and the clamping plate are in the same force-bearing section, thereby reducing the force loss during the thrust transmission process of the hydraulic cylinder.

[0007] A hand hole is provided on the surface of the clamping plate, and a limit plate is provided in the hand hole. The limit plate passes through the hand hole, and its upper surface presses against the partition, and its lower surface presses against the hand hole of the clamping plate, which can limit the upward displacement of the pre-tightening device during the clamping process and ensure that the clamping force acting on the U-rib will not move upward.

[0008] The outer diameter of the outer circle of the crescent plate is equal to the inner diameter of the arc groove of the swing arm, ensuring that the crescent plate can rotate closely against the arc groove.

[0009] The partition is installed with π-shaped parts arranged in pairs, and the large surfaces of the π-shaped parts on both sides are respectively fitted with the U ribs. The crescent plates on the front and back sides of the partition press the two ends of the π-shaped parts at the same time, so that the large surfaces of the π-shaped parts are close to the U ribs, ensuring that the preload force on the U ribs is more uniform.

[0010] A limiting magnet is arranged below the π-shaped piece, and the limiting magnet is adsorbed on the partition plate to prevent the π-shaped piece from sliding downward before the U-rib is clamped.

[0011] The upper end of the limiting magnet presses against the lower edge of the corresponding π-shaped piece to prevent the π-shaped piece from sliding downward before the U-rib is clamped.

[0012] The calibration device includes semi-U-shaped iron blocks arranged in pairs, and square grooves are respectively provided on the large surfaces opposite to each other on both sides of the semi-U-shaped iron blocks, and pressure sensors are installed in the square grooves. The actual loading efficiency of the preload device can be obtained by performing a calibration experiment.

[0013] The slope angle of the semi-U-shaped iron block is the same as the angle of the U rib, and a gap is left between the semi-U-shaped iron blocks on both sides, and the overall size thereof is the same as the U rib.

[0014] A method for using a pre-tightening device for assembling an anchored U-rib comprises the following steps:

[0015] S1. Calibration process: Place two half-U-shaped iron blocks according to the size of the U ribs, leaving a gap in the middle, and place the pressure sensor in the square grooves of the two half-U-shaped iron blocks. In the initial state, the pressure sensor is not subject to the clamping force of the half-U-shaped iron blocks;

[0016] S2. Place the pre-tightening devices on both sides on the two semi-U-shaped iron blocks respectively, with the bottom surface of the clamping plate close to the top surface of the two semi-U-shaped iron blocks, and push the pre-tightening device until it is close to the large surface of the partition; pass the limit plate through the clamping plate, adjust the π-shaped piece, and press the limit magnet against the lower edge of the π-shaped piece;

[0017] S3. Start the pump station, the hydraulic cylinder extends, drives the swing arm to rotate around the axis, and then drives the crescent plate to clamp the π-shaped piece, and finally presses the two half-U-shaped iron blocks, gradually adjusts the pressure to the maximum value, reads the value of the pressure sensor, and obtains the actual loading coefficient of the preload device;

[0018] S4. Place the pre-tightening devices on both sides on the anchored U-rib, with the bottom surface of the clamping plate close to the top surface of the anchored U-rib, and push the pre-tightening device until it is close to the large surface of the partition; pass the limit plate through the clamping plate, adjust the π-shaped piece, and press the limit magnet against the lower edge of the π-shaped piece;

[0019] S5. Start the pump station, the hydraulic cylinder extends, drives the swing arm to rotate around the axis, and then drives the crescent plate to clamp the π-shaped part, and finally compresses the anchored U-rib. After the π-shaped part is anchored, the pressure is released and the pre-tightening device loosens the π-shaped part.

[0020] Beneficial effects: The present invention has the following advantages:

[0021] 1. The pre-tightening device of the present invention has a compact structure, reasonable layout, small overall volume, and is easy to carry. It is suitable for working conditions where the construction space in the partition unit is very small;

[0022] 2. The preload device of the present invention adopts an assembled structure and modular design, which can achieve rapid disassembly and assembly, and meet the process requirements for assembling π-shaped parts;

[0023] 3. The pre-tightening device of the present invention can not only make the large surface of the crescent plate always clamp the π-shaped part by installing the crescent plate in the arc groove on the back of the swing arm, but also can adapt to U-ribs of various angles, and has a wide range of applications by relying on the rotation of the crescent plate itself;

[0024] 4. The pre-tightening device of the present invention is respectively installed with a set of pre-tightening devices on the front and back sides of the partition. During the clamping process, the crescent plates on the front and back sides of the partition simultaneously press the two ends of the π-shaped piece, so that the large surface of the π-shaped piece is close to the U rib, ensuring that the pre-tightening force on the U rib is more uniform;

[0025] 5. The pre-tightening device of the present invention amplifies the thrust of the hydraulic cylinder by setting a suitable swing arm size, so that the adjustable range of the clamping force of the pre-tightening device is larger;

[0026] 6. The calibration device of the present invention can detect the clamping efficiency at any time to ensure the accuracy of the clamping force of the pre-tightening device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the pre-tightening device of the present invention;

[0028] Figure 2 It is a schematic diagram of the swing arm structure of the present invention;

[0029] Figure 3 This is a front view of the anchored U-rib clamping state of the present invention;

[0030] Figure 4 It is a side view of the clamping state of the anchoring U-rib of the present invention;

[0031] Figure 5 It is a schematic diagram of the calibration state of the present invention;

[0032] Figure 6 It is a schematic diagram of a semi-U-shaped iron block of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings.

[0034] Example 1

[0035] like Figure 1As shown, the pre-tightening device for assembling anchored U-ribs of this embodiment includes a pre-tightening device 7, a calibration device and a partition 10, wherein a set of pre-tightening devices 7 are respectively arranged on both sides of the partition 10, and the pre-tightening devices 7 on both sides of the partition 10 are arranged in a mirror image. The pre-tightening device 7 includes a hydraulic cylinder 3, and swing arms 2 are symmetrically installed on both sides of the hydraulic cylinder 3. The backs of the swing arms 2 on both sides are respectively arranged toward the partition 10, and a splint 4 is provided under the hydraulic cylinder 3. The two ends of the splint 4 are respectively connected to the swing arms 2 on the corresponding sides, and the ear plates at both ends of the hydraulic cylinder 3 and the splint 4 are respectively hingedly installed on the front side of the swing arm 2 through pins, so that the hydraulic cylinder 3 and the splint 4 are in the same force-bearing section, thereby reducing the force loss during the thrust transmission of the hydraulic cylinder 3.

[0036] By setting the size of the swing arm 2, the thrust of the hydraulic cylinder 3 is amplified by 1.2 times through the swing arm 2, so that the adjustable range of the clamping force of the pre-tightening device 7 is larger. Figure 2 As shown, arc grooves 2-1 are provided at the lower part of opposite sides of the swing arm 2, and the arc grooves 2-1 on both sides are arranged in a mirror image. The arc groove 2-1 is set on the back of the swing arm 2, and a crescent plate 1 is installed in the arc groove 2-1. The crescent plate 1 is installed in the arc groove 2-1 on the back of the swing arm 2 by bolts. The outer diameter of the outer circle of the crescent plate 1 and the inner diameter of the arc groove 2-1 of the swing arm 2 are set to the same size to ensure that the crescent plate 1 can rotate close to the arc groove 2-1.

[0037] The lower edge of the clamping plate 4 is placed on the top surface of the U rib 8, as shown in FIG. Figure 3 As shown, arcs of suitable size are provided at both ends, and a gap of 1mm is left between the rounded corners on both sides of the top of the U rib 8, which can limit the left and right swing of the entire pre-tightening device 7 and facilitate quick installation. A hand hole is provided in the middle of the clamping plate 4 to facilitate the operator to install and carry the pre-tightening device 7 and reduce the overall weight. A limit plate 5 is provided in the hand hole, which passes through the hand hole in the middle of the clamping plate 4. The upper surface of the limit plate 5 supports the partition 10, and the lower surface supports the clamping plate hand hole, which can limit the upward displacement of the pre-tightening device 7 during the clamping process and ensure that the clamping force acting on the U rib 8 does not move upward.

[0038] like Figure 3 and Figure 4 As shown, the partition 10 is equipped with π-shaped pieces 9 arranged in pairs, and the large surfaces of the π-shaped pieces 9 on both sides are respectively attached to the U ribs 8, and the crescent plates 1 on the front and back sides of the partition 10 simultaneously press the two ends of the π-shaped piece 9, so that the large surface of the π-shaped piece 9 is close to the U rib 8, ensuring that the preload force on the U rib 8 is more uniform. Limiting magnets 6 are provided below the π-shaped pieces 9 on both sides, and the limiting magnets 6 are adsorbed on the partition 10. The upper ends of the limiting magnets 6 support the corresponding lower edges of the π-shaped pieces 9 to prevent the π-shaped pieces 9 from sliding downward before the U rib 8 is clamped.

[0039] When clamping is required, the hydraulic cylinder 3 extends to drive the swing arms 2 on both sides to rotate synchronously. Under the clamping force of the swing arms 2, the outer circumferential surface of the crescent plate 1 is pressed against the arc groove 2-1 of the swing arms 2 and rotates around the axis, so that the large surface of the crescent plate 1 always clamps the π-shaped part 9 and adapts to the angle of the U-rib 8 at the same time.

[0040] like Figure 5 and Figure 6 As shown, the calibration device includes half U-shaped iron blocks 11 arranged in pairs, and two through-length square grooves 11-1 are respectively provided on the large faces of the half U-shaped iron blocks 11 on both sides. The angle of the bevel of the half U-shaped iron block 11 is the same as the angle of the U rib 8. A certain gap is left between the two half U-shaped iron blocks 11, and the whole thereof is the same size as the U rib 8. An annular pressure sensor 12 is installed in the square groove 11-1 between the two half U-shaped iron blocks 11, and the actual loading efficiency of the preload device can be obtained by performing a calibration experiment. The two half U-shaped iron blocks 11 are placed according to the size of the U rib, leaving a certain gap in the middle. The annular pressure sensor 12 is placed in the square groove 11-1 of the two half U-shaped iron blocks 11. In the initial state, the annular pressure sensor 12 is not subjected to the clamping force of the half U-shaped iron block 11.

[0041] The present invention applies pre-tightening force to the π-shaped member in the narrow space of the partition unit so that the member is completely in close contact with the contact surface of the anchored U-rib, and after the π-shaped member is anchored, a part of the residual internal stress can be retained to ensure the supporting effect of the π-shaped member on the U-rib.

[0042] Example 2

[0043] The method for using the pre-tightening device for assembling the anchored U-rib of this embodiment includes the following steps:

[0044] S1. Calibration process: Place two half-U-shaped iron blocks 11 according to the size of the U ribs, leaving a certain gap in between. Place the annular pressure sensor 12 in the square groove 11-1 of the two half-U-shaped iron blocks 11. In the initial state, the annular pressure sensor 12 is not subject to the clamping force of the half-U-shaped iron block 11.

[0045] S2. Place the pre-tightening device 7 on the two half-U-shaped iron blocks 11, and the bottom surface of the clamping plate 4 is close to the top surface of the two half-U-shaped iron blocks 11. Push the pre-tightening device 7 inward until the end surface of the pin is close to the large surface of the partition. Similarly, install another set of pre-tightening devices 7 on the back of the partition; pass the limit plate 5 through the inner grooves of the two sets of clamping plates 4. Adjust the upper and lower positions of the π-shaped part, and adsorb the limit magnet 6 on the large surface of the U rib to support the lower edge of the π-shaped part.

[0046] S3, start the pump station, the piston rod of the hydraulic cylinder 3 extends, driving the swing arm 2 to rotate around the axis, and then driving the crescent plate 1 to clamp the π-shaped piece, and finally compress the two semi-U-shaped iron blocks 11. Starting from the preload device 7 showing 1KN, increase the pump station pressure by 1KN each time until the pump station pressure reaches the maximum value, read the value of the annular pressure sensor, and obtain the actual loading coefficient of the preload device 7 according to the weighted formula.

[0047] S4. Place the pre-tightening device 7 on the anchored U-rib, and the bottom surface of the clamping plate 4 is close to the top surface of the anchored U-rib. Push the pre-tightening device 7 inward until the end surface of the pin is close to the large surface of the partition. Similarly, install another set of pre-tightening devices 7 on the back of the partition; pass the limit plate 5 through the inner grooves of the two sets of clamping plates 4. Adjust the upper and lower positions of the π-shaped part, and adsorb the limit magnet 6 on the partition to support the lower edge of the π-shaped part.

[0048] S5, start the pump station, the piston rod of the hydraulic cylinder 3 extends, drives the swing arm 2 to rotate around the axis, and then drives the crescent plate 1 to clamp the π-shaped part, and finally compresses the anchored U rib. After the π-shaped part is anchored, the pump station releases the pressure, the piston rod of the hydraulic cylinder 3 retracts, and the pre-tightening device 7 releases the π-shaped part.

Claims

1. A pre-tightening device for assembling anchored U-ribs, characterized in that: It includes a pre-tightening device, a calibration device and a partition, wherein the pre-tightening device is mirror-set on both sides of the partition, the pre-tightening device includes a hydraulic cylinder, swing arms are symmetrically installed on both sides of the hydraulic cylinder, the backs of the swing arms on both sides are respectively arranged toward the partition, a clamping plate is provided under the hydraulic cylinder, the lower edge of the clamping plate is placed on the top surface of the U-rib, both ends of the clamping plate are respectively connected to the swing arms on the corresponding side, an arc groove is opened on the lower part of the opposite side of the swing arm, the arc groove is arranged on the back of the swing arm, and a crescent plate is installed in the arc groove.

2. The pre-tightening device for assembling anchored U-ribs according to claim 1, characterized in that: The hydraulic cylinder and the clamping plate are respectively hingedly installed on the front side of the swing arm.

3. The pre-tightening device for assembling anchored U-ribs according to claim 2, characterized in that: A hand hole is arranged on the surface of the clamping plate, a limit plate is arranged in the hand hole, the limit plate passes through the hand hole, the upper surface of the limit plate abuts the partition plate, and the lower surface abuts the clamping plate hand hole.

4. The pre-tightening device for assembling anchored U-ribs according to claim 1, characterized in that: The outer diameter of the outer circle of the crescent plate is equal to the inner diameter of the swing arm arc groove.

5. The pre-tightening device for assembling anchored U-ribs according to claim 1, characterized in that: The partition is installed with π-shaped pieces arranged in pairs, the large surfaces of the π-shaped pieces on both sides are respectively fitted with the U-ribs, and the crescent plates on the front and back sides of the partition press the two ends of the π-shaped pieces at the same time.

6. The pre-tightening device for assembling anchored U-ribs according to claim 5, characterized in that: A limiting magnet is arranged below the π-shaped piece, and the limiting magnet is adsorbed on the partition.

7. The pre-tightening device for assembling anchored U-ribs according to claim 6, characterized in that: The upper end of the limiting magnet presses against the lower edge of the corresponding π-shaped piece.

8. The pre-tightening device for assembling anchored U-ribs according to claim 1, characterized in that: The calibration device comprises semi-U-shaped iron blocks arranged in pairs, and square grooves are respectively provided on the large surfaces opposite to each other on both sides of the semi-U-shaped iron blocks, and pressure sensors are installed in the square grooves.

9. The pre-tightening device for assembling anchored U-ribs according to claim 8, characterized in that: The slope angle of the semi-U-shaped iron block is the same as the angle of the U rib, and a gap is left between the semi-U-shaped iron blocks on both sides, and the overall size thereof is the same as the U rib.

10. A method for using the pre-tightening device for assembling anchored U-ribs according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Calibration process: Place two half-U-shaped iron blocks according to the size of the U ribs, leaving a gap in the middle, and place the pressure sensor in the square grooves of the two half-U-shaped iron blocks. In the initial state, the pressure sensor is not subject to the clamping force of the half-U-shaped iron blocks; S2. Place the pre-tightening devices on both sides on the two semi-U-shaped iron blocks respectively, with the bottom surface of the clamping plate close to the top surface of the two semi-U-shaped iron blocks, and push the pre-tightening device until it is close to the large surface of the partition; pass the limit plate through the clamping plate, adjust the π-shaped piece, and press the limit magnet against the lower edge of the π-shaped piece; S3. Start the pump station, the hydraulic cylinder extends, drives the swing arm to rotate around the axis, and then drives the crescent plate to clamp the π-shaped piece, and finally presses the two half-U-shaped iron blocks, gradually adjusts the pressure to the maximum value, reads the value of the pressure sensor, and obtains the actual loading coefficient of the preload device; S4. Place the pre-tightening devices on both sides on the anchored U-rib, with the bottom surface of the clamping plate close to the top surface of the anchored U-rib, and push the pre-tightening device until it is close to the large surface of the partition; pass the limit plate through the clamping plate, adjust the π-shaped piece, and press the limit magnet against the lower edge of the π-shaped piece; S5. Start the pump station, the hydraulic cylinder extends, drives the swing arm to rotate around the axis, and then drives the crescent plate to clamp the π-shaped part, and finally compresses the anchored U-rib. After the π-shaped part is anchored, the pressure is released and the pre-tightening device loosens the π-shaped part.

Images