Jacking device for bridge incremental launching construction

Abstract

The utility model relates to a jacking device for bridge incremental launching construction. The jacking device effectively solves the problems that a bridge jacking device is difficult to block up and poor in accuracy. According to the technical scheme, a jacking hydraulic cylinder comprises a first jacking rod, a jacking head unit comprises a jacking block and a jacking plate, a first oil cavity is formed in the lower end of the jacking block, the upper end of the first jacking rod extends into the first oil cavity, two vertical holes which are symmetrically distributed left and right are formed in the upper end of the jacking block, the lower ends of the vertical holes are communicated with the first oil cavity, and a second piston is arranged in each vertical hole; the upper section of each second piston is connected with a second ejector rod, the upper end of the second ejector rod at the left end is in spherical hinge connection with the lower surface of a top plate, a T-shaped sliding block is in spherical hinge connection with the second ejector rod at the right end, a T-shaped groove in the left-right direction is formed in the right side of the lower surface of the top plate, and the T-shaped block is arranged in the T-shaped groove in a sliding mode. The top plate can automatically deflect to be in a state of being attached to the beam body, the position of the top plate can be locked in the jacking process, and the stability of the top plate during jacking and pushing of the beam body is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of bridge jacking construction, in particular to a jacking device for bridge jacking construction. Background Art

[0002] Jacking construction is suitable for large-span bridges. Specifically, after the beam is cast, the beam is lifted off the ground by a jacking hydraulic cylinder, and then the beam is pushed forward by a jacking hydraulic cylinder so that the beam is placed on the bridge pier. When the jacking hydraulic cylinder lifts the beam, the bottom surface of the beam is not necessarily horizontal. Construction workers generally use gaskets to pad it, which will result in large errors and cannot guarantee that the beam will be accurately lifted to the predetermined position. The operation is also difficult.

[0003] The utility model patent with application number: 202322749412.2 adjusts the angle by setting a raising mechanism at one end. The raising mechanism is a set of separate hydraulic cylinder units, which can raise one end more accurately. However, the raising requires active operation and cannot be automatically adjusted. There is still room for improvement in accuracy.

[0004] The utility model patent with application number: 201920876640.7 sets a spherical base between the Qianjin top and the upper top plate, so that the upper top plate and the upper end of the Qianjin top are matched in a spherical joint, so that the upper top plate can rotate freely and automatically adapt to the bottom angle of the beam. However, the upper top plate is not locked during the jacking process, and the beam body is prone to deflection, posing a huge safety hazard. Summary of the Invention

[0005] The utility model provides a jacking device for bridge jacking construction, aiming to solve the problems of difficulty in raising the bridge jacking device and poor accuracy.

[0006] The technical solution provided by the invention includes a lifting hydraulic cylinder and a lifting head unit. The lifting hydraulic cylinder includes a cylinder body, a first piston is installed in the cylinder body, the upper end of the first piston is connected to a first push rod, the first push rod extends from the upper end of the cylinder body, and an oil pipe is provided at the bottom of the cylinder body; the lifting head unit includes a top block and a top plate, a first oil chamber is opened at the lower end of the top block, the upper end of the first push rod extends into the first oil chamber, and the outer wall of the first push rod is in contact with the inner wall of the first oil chamber, two vertical holes symmetrically distributed on the left and right are opened at the upper end of the top block, the lower end of the vertical holes is connected to the first oil chamber, a second piston is installed in each vertical hole, and a second push rod is connected to the upper section of each second piston, the upper end of the second push rod at the left end is connected to the ball joint of the lower surface of the top plate, and the ball joint of the second push rod at the right end is provided with a T-shaped slider, and a T-slot in the left and right directions is opened on the right side of the lower surface of the top plate, and the T-block is slidably placed in the T-slot.

[0007] A second oil chamber is formed at the bottom of the first oil chamber, a third piston is arranged in the second oil chamber, and a first return compression spring is arranged above the third piston.

[0008] A second return compression spring is installed on the upper end of the second piston, and the pressure of the second return compression spring is less than the pressure of the first return compression spring.

[0009] The upper end of the cylinder body is equipped with a vertical guide rod, which passes through the top block. A limiting nut is screwed onto the upper end of the guide rod.

[0010] A pressure relief hole is provided at the upper end of the second oil chamber.

[0011] The upper port of the cylinder body, the upper port of the vertical hole and the lower port of the second oil chamber are all screwed with limit rings.

[0012] The upper end surface of the first push rod and the bottom surface of the first oil chamber are both conical.

[0013] The upper end of the first push rod is equipped with a sealing gasket.

[0014] The lower end of the lifting hydraulic cylinder is equipped with a slide plate.

[0015] The top plate of the utility model can automatically deflect to a state where it fits the beam body, and the position of the top plate can be locked during the jacking process, thereby ensuring the stability of the top plate when jacking and pushing the beam body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front cross-sectional view of the utility model in state 1.

[0017] Figure 2 This is a front cross-sectional view of the second state of the utility model.

[0018] Figure 3 This is a front cross-sectional view of the third state of the present invention.

[0019] Figure 4 This is a front cross-sectional view of the fourth state of the present invention.

[0020] Figure 5 This is an end view of the T-slider and T-slot. DETAILED DESCRIPTION

[0021] In conjunction with the accompanying drawings, the utility model includes a lifting hydraulic cylinder and a lifting head unit. The lifting head unit is located above the lifting hydraulic cylinder and contacts the bottom of the beam. The lifting hydraulic cylinder lifts the beam body through the lifting head unit. The lifting hydraulic cylinder includes a cylinder body 1, a first piston 2 is installed in the cylinder body 1, the upper end of the first piston 2 is connected to a first push rod 3, the first push rod 3 extends from the upper end of the cylinder body 1, and an oil pipe 4 is provided at the bottom of the cylinder body 1; the lifting head unit includes a top block 5 and a top plate 6, a first oil chamber 7 is opened at the lower end of the top block 5, the upper end of the first push rod 3 extends into the first oil chamber 7, and the outer wall of the first push rod 3 is in contact with the inner wall of the first oil chamber 7, and two vertical holes 8 are symmetrically distributed on the left and right at the upper end of the top block 5. The lower end of the vertical hole 8 is connected to the first oil chamber 7, and each vertical hole 8 is equipped with a The second piston 9, each second piston 9 is connected to a second push rod 10 on the upper section, and the first push rod 3 moves upward relative to the top block 5, which will push the second piston 9 upward through the hydraulic oil in the first oil chamber 7. When the two second pistons 9 are at the same height, the top plate 6 is horizontal. When the two second pistons 9 are not at the same height, the top plate 6 is tilted, and the top plate 6 can automatically adapt to the angle of the bottom of the beam and fit the bottom of the beam. The upper end of the second push rod 10 at the left end is connected to the lower surface of the top plate 6 by a ball joint, and the upper ball joint of the second push rod 10 at the right end has a T-shaped slider 11. A T-shaped slot 12 in the left and right directions is opened on the right side of the lower surface of the top plate 6, and the T-block is slidably placed in the T-shaped slot 12; the T-shaped slot 12 and the T-shaped slider 11 slide together to provide freedom for the relative movement of the top plate 6 and the slider when the top plate 6 is deflected.

[0022] A second oil chamber 13 is opened at the bottom of the first oil chamber 7, and a third piston 14 is installed in the second oil chamber 13, and a first return compression spring 15 is installed above the third piston 14; after the top plate 6 is in contact with the bottom of the beam, the first push rod 3 will continue to move upward and will no longer be able to push the second piston 9 to move upward. Therefore, the hydraulic oil in the first oil chamber 7 will be pressed into the second oil chamber 13 for temporary storage until the upper end of the first push rod 3 is completely in contact with the bottom surface of the first oil chamber 7, closing the lower ends of the two vertical holes 8.

[0023] A second return compression spring 16 is installed at the upper end of the second piston 9, and the pressure of the second return compression spring 16 is less than the pressure of the first return compression spring 15; on the one hand, the two return compression springs are used to reset the piston downward, and on the other hand, in the initial stage of the rise of the first push rod 3, the second piston 9 and the third piston 14 do not rise relative to the top block 5 under the action of the return compression springs. The first push rod 3 will push the entire lifting head unit to rise as a whole until the top plate 6 contacts the bottom of the beam, and then the second piston 9 rises to the top plate 6 and fits the bottom of the beam, and then the third piston 14 rises to the upper end of the first push rod 3 and fits the bottom surface of the first oil chamber 7. Finally, the first push rod 3 pushes the entire lifting head to rise through direct contact with the top block 5 and starts to lift the beam body.

[0024] The upper end of the cylinder body 1 is provided with a vertical guide rod 17, which passes through the top block 5. A limit nut 18 is screwed onto the upper end of the guide rod 17, which can prevent the jacking head unit from detaching from the jacking hydraulic cylinder.

[0025] A pressure relief hole 19 is formed at the upper end of the second oil chamber 13 , and when the third piston 14 rises, the air above the third piston 14 is discharged from the pressure relief hole 19 to avoid resistance.

[0026] The upper port of the cylinder body 1, the upper port of the vertical hole 8 and the lower port of the second oil chamber 13 are all screwed with a limit ring 20 to prevent the piston from slipping.

[0027] The upper end surface of the first push rod 3 and the bottom surface of the first oil chamber 7 are both tapered, which can improve the matching effect between the two.

[0028] A sealing gasket 21 is installed at the upper end of the first push rod 3 to ensure that the lower end of the vertical hole 8 can be closed.

[0029] The lower end of the lifting hydraulic cylinder is provided with a slide plate 22, which is made of polytetrafluoroethylene to reduce friction during jacking.

[0030] The initial state of the utility model is as follows Figure 1 As shown, the ejector block 5 contacts the upper end of the cylinder body 1, there is a gap between the upper end of the first ejector rod 3 and the bottom surface of the first oil chamber 7, and the second piston 9 and the third piston 14 are at the lowest limit position under the action of the return compression spring.

[0031] When in use, oil is injected into the cylinder 1 through the oil pipe 4 to push the first piston 2 and the first push rod 3 to rise. In the early stage of the rise of the first push rod 3, the second piston 9 and the third piston 14 do not rise relative to the top block 5 under the action of the return compression spring. Therefore, the first push rod 3 will push the entire lifting head unit to rise as a whole until one end of the top plate 6 contacts the bottom of the beam. Figure 2 As shown; since the second push rod 10 on the side in contact with the bottom of the beam cannot continue to rise, the top block 5 cannot continue to rise either. The continued rise of the first push rod 3 will pressurize the hydraulic oil in the first oil chamber 7, and the hydraulic oil in the first oil chamber 7 will push the second push rod 10 on the other side to rise, so the top plate 6 rotates around the hinge end until the top plate 6 is completely in contact with the bottom of the beam, as shown. Figure 3 shown.

[0032] After the top plate 6 is completely in contact with the bottom of the beam, the two positioning push rods cannot continue to rise. Then the first push rod 3 continues to rise, pressing the hydraulic oil in the first oil chamber 7 into the second oil chamber 13, causing the third piston 14 to move upward until the upper end of the first push rod 3 is completely in contact with the bottom surface of the first oil chamber 7. Figure 4 As shown, the lower ends of the two vertical holes 8 are closed, and the positions of the two second push rods 10 are locked, that is, the angle of the top plate 6 is locked.

[0033] After the upper end of the first push rod 3 contacts the bottom surface of the first oil chamber 7, the first push rod 3 continues to rise and pushes the entire lifting head unit to rise through direct contact with the lifting block 5, and starts to lift the beam body.

[0034] After the beam is lifted to the designed height, the lifting hydraulic cylinder is pushed by the pushing hydraulic cylinder to slide along the longitudinal direction of the beam to feed the beam.

[0035] When the bottoms of the two vertical holes 8 of the present invention are connected to the first oil chamber 7 at the same time, the top plate 6 can automatically deflect to a state in which it is in contact with the beam body, without the need for active intervention to adjust the angle of the top plate 6; after the top plate 6 is in contact with the bottom of the beam, the first push rod 3 closes the lower ends of the two vertical holes 8, thereby locking the positions of the two second push rods 10, and then locking the position of the top plate 6, thereby ensuring the stability of the top plate 6 when lifting and pushing the beam body.

Claims

1. A jacking device for bridge jacking construction, comprising a jacking hydraulic cylinder and a jacking head unit, wherein the jacking hydraulic cylinder comprises a cylinder body (1), a first piston (2) is installed in the cylinder body (1), the upper end of the first piston (2) is connected to a first push rod (3), the first push rod (3) extends from the upper end of the cylinder body (1), and an oil pipe (4) is provided at the bottom of the cylinder body (1); characterized in that, The jacking head unit includes a top block (5) and a top plate (6). A first oil chamber (7) is opened at the lower end of the top block (5). The upper end of the first top rod (3) extends into the first oil chamber (7), and the outer wall of the first top rod (3) is in contact with the inner wall of the first oil chamber (7). Two vertical holes (8) symmetrically distributed on the left and right are opened at the upper end of the top block (5). The lower ends of the vertical holes (8) are connected to the first oil chamber (7). A second piston (9) is installed in each vertical hole (8). The upper section of each second piston (9) is connected to a second top rod (10). The upper end of the second top rod (10) at the left end is connected to the lower surface of the top plate (6) by a ball joint. The upper ball joint of the second top rod (10) at the right end has a T-shaped slider (11). A T-shaped slot (12) in the left and right directions is opened on the right side of the lower surface of the top plate (6). The T-shaped block is slidably placed in the T-shaped slot (12).

2. A jacking device for bridge jacking construction according to claim 1, characterized in that: A second oil chamber (13) is formed at the bottom of the first oil chamber (7), a third piston (14) is installed in the second oil chamber (13), and a first return compression spring (15) is installed above the third piston (14).

3. A jacking device for bridge jacking construction according to claim 1 or 2, characterized in that: A second return compression spring (16) is installed on the upper end of the second piston (9), and the pressure of the second return compression spring (16) is smaller than the pressure of the first return compression spring (15).

4. A jacking device for bridge jacking construction according to claim 1, characterized in that: The upper end of the cylinder body (1) is provided with a vertical guide rod (17), which passes through the top block (5). A limit nut (18) is screwed onto the upper end of the guide rod (17).

5. The jacking device for bridge jacking construction according to claim 2, characterized in that: A pressure relief hole (19) is provided at the upper end of the second oil chamber (13).

6. A jacking device for bridge jacking construction according to claim 1 or 2, characterized in that: The upper port of the cylinder body (1), the upper port of the vertical hole (8), and the lower port of the second oil chamber (13) are all screwed with a limit ring (20).

7. The jacking device for bridge jacking construction according to claim 1, characterized in that: The upper end surface of the first push rod (3) and the bottom surface of the first oil chamber (7) are both conical.

8. The jacking device for bridge jacking construction according to claim 1, characterized in that: A sealing gasket (21) is installed at the upper end of the first push rod (3).

9. The jacking device for bridge jacking construction according to claim 1, characterized in that: The lower end of the lifting hydraulic cylinder is provided with a slide plate (22).

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