A Jacking and Skidding Method for the Closure of the Side Span of a Long-Span Cable-Stayed Bridge

Abstract

The present invention belongs to the technical field of the closure construction of cable-stayed bridges, and in particular to a method for jacking and sliding the side-span closure of a long-span cable-stayed bridge using a jack, which includes the following steps: Step 1, deck hoisting. Hoist the S15 beam segment by a deck crane. After connecting with the S14 beam segment, install and tension the 15th pair of stay cables. This method for jacking and sliding the side-span closure of a long-span cable-stayed bridge, by setting Steps 1 to 7 and cooperating with a jacking mechanism, when carrying out the side-span closure of a long-span cable-stayed bridge, respectively adjust the closure height of the beam segments, conduct lateral closure adjustment of the beam segments, and push the beam segments to conduct longitudinal closure movement adjustment, so as to achieve precise adjustment of the side-span closure beam segments, thus solving the problem that in the existing assembled side-span closure method, it is difficult to control and adjust the accuracy, stability and sealing performance of the interfaces at various parts of the bridge deck.

Description

Technical Field

[0001] The present invention relates to the technical field of cable-stayed bridge closure construction, and particularly to a method for jack-pushing and sliding the side span closure of a long-span cable-stayed bridge. Background Art

[0002] At present, the side span closure methods of cable-stayed bridges are generally divided into the expansion joint type and the assembled type. The expansion joint type side span closure method divides the bridge deck into two sections, sets an expansion joint between the two sections, and realizes the side span closure by controlling the expansion and contraction of the expansion joint. This method has a simple structure and convenient construction, but there are problems such as the anti-corrosion, sealing, and durability of the expansion parts. Therefore, the expansion joint type side span closure method is not suitable for long-span heavy-load bridges.

[0003] The existing assembled type side span closure method divides the entire bridge deck into multiple small sections, and then uses the assembly method to carry out the side span closure. Although this method is suitable for long-span and heavy-load bridges and can reduce the impact of expansion joints on vehicle travel, in the specific construction process, there are problems that it is difficult to control and adjust the accuracy, stability, and sealing of the interfaces of each part of the bridge deck. Therefore, a method for jack-pushing and sliding the side span closure of a long-span cable-stayed bridge is needed. Summary of the Invention

[0004] Based on the technical problem that it is difficult to control and adjust the accuracy, stability, and sealing of the interfaces of each part of the bridge deck in the existing assembled type side span closure method, the present invention proposes a method for jack-pushing and sliding the side span closure of a long-span cable-stayed bridge.

[0005] A method for jack-pushing and sliding the side span closure of a long-span cable-stayed bridge proposed by the present invention includes the following steps:

[0006] Step 1: Bridge deck hoisting. Hoist the S15 beam section with a bridge deck crane. After connecting with the S14 beam section, install and tension the 15th pair of stay cables.

[0007] Step 2: Determine the closure time. The bridge deck crane does not move forward. Observe the position of the beam section according to the monitoring requirements, and determine the closure time according to the measurement results and monitoring instructions.

[0008] Step 3: Jack-pushing and sliding. Use the jack-pushing mechanism to jack-push and slide the S16 beam section, and finely adjust the opposite beam section.

[0009] The jack-pushing mechanism includes a jack-pushing support for jack-pushing and positioning and fixing. The jack-pushing support is fixedly installed on the upper surface of the bridge pier. The lower surface of the jack-pushing support is fixedly connected with a stay cable support frame, and one end of the stay cable support frame is fixedly connected with one side surface of the bridge pier.

[0010] Step 4. Hoop joint positioning: Position the hoop joint of the closure beam segment, weld the circumferential weld, complete the connection work between the S16 beam segment and the S15 beam segment, and achieve the closure of the side span.

[0011] Step 5. Bearing grouting: When it is ensured that the beam segment will no longer be adjusted, grout the bearing and remove the bolts on the side of the bearing.

[0012] Step 6. First stage of weight pressing: Conduct the first stage of weight pressing on the S16 beam segment.

[0013] Step 7. Mid-span closure: Move the mid-span crane forward to the designated position and prepare for the mid-span closure.

[0014] Preferably, a plurality of support hydraulic cylinders symmetrically distributed around the axis of the jacking support are fixedly installed on the upper surface of the jacking support. The support hydraulic cylinder includes a support hydraulic rod.

[0015] One end of the support hydraulic rod is fixedly connected to a support seat with a circular surface. The upper surface of the support seat is fixedly connected to a load-bearing base with a J-shaped surface. The surface of the support seat is fixedly connected to a plurality of reinforcing ribs annularly arrayed around the axis of the support seat. The surface of the reinforcing rib is fixedly connected to the lower surface of the load-bearing base.

[0016] Preferably, two first bearing seats symmetrically distributed around the axis of the load-bearing base are fixedly installed on the upper surface of the load-bearing base. A load-bearing support roller is rotatably connected to the surface of the first bearing seat through a bearing. One end of the load-bearing support roller is rotatably connected to the inner wall of the load-bearing base through a bearing.

[0017] Preferably, a plurality of uniformly distributed rotation grooves are formed on the surface of the load-bearing support roller. A support ball is rotatably connected to the inner wall of the rotation groove, and the surface of the support ball extends to the surface of the load-bearing support roller.

[0018] Preferably, two stop limit travel grooves symmetrically distributed around the axis of the load-bearing base are formed on the inner top wall of the load-bearing base. A stop limit block is slidably connected to the inner wall of the stop limit travel groove. The lower surface of the stop limit block is fixedly connected to a side jacking block with an M-shaped surface. The lower surface of the side jacking block is slidably connected to the surface of the load-bearing base.

[0019] A side jacking reducer is fixedly installed at one end of the load-bearing base. A side jacking driving motor is fixedly installed on the surface of the side jacking reducer. The output shaft of the side jacking driving motor is fixedly connected to the deceleration input end of the side jacking reducer.

[0020] Preferably, a second bearing block is fixedly installed on the surface of the load-bearing base. The second bearing block is located between the two first bearing blocks. A side-pushing drive screw rod is rotatably connected to the surface of the second bearing block through a bearing. The surface of the side-pushing drive screw rod is threadedly connected to the surface of the side-pushing block.

[0021] One end of the side-pushing drive screw rod penetrates and extends to one end of the load-bearing base. One end of the side-pushing drive screw rod is fixedly connected to the decelerating output end of the side-pushing speed reducer.

[0022] Preferably, two symmetrically distributed and strongly fixed mounting plates are fixedly connected to the surface of the pushing support. Two symmetrically distributed stop guiding columns are fixedly connected to the surface of the strongly fixed mounting plates. An active pushing seat is slidably connected to the surface of the stop guiding columns.

[0023] Preferably, the lower surface of the active pushing seat is slidably connected to the upper surface of the pushing support. A pushing drive screw rod is threadedly connected to the surface of the active pushing seat. Both ends of the pushing drive screw rod are rotatably connected to the surface of the strongly fixed mounting plates through bearings.

[0024] Preferably, a pushing speed reducer is fixedly installed on the surface of one of the strongly fixed mounting plates. One end of the pushing drive screw rod is fixedly connected to the decelerating output end of the pushing speed reducer.

[0025] A pushing drive motor is fixedly installed on the surface of the pushing speed reducer. The output shaft of the pushing drive motor is fixedly connected to the power input end of the pushing speed reducer.

[0026] Preferably, a pushing hydraulic cylinder is fixedly installed on the surface of the active pushing seat. The two pushing hydraulic cylinders are symmetrically distributed with the axis of the active pushing seat as the center. The pushing hydraulic cylinder includes a pushing hydraulic oil rod. One end of the pushing hydraulic oil rod is fixedly installed with a wear-resistant contact rubber block for contacting and pushing the closure beam segment.

[0027] The beneficial effects of the present invention are as follows:

[0028] 1. By setting steps one to seven and cooperating with the jack pushing mechanism, when the side span of the long-span cable-stayed bridge is closed, the closing height of the beam segment is adjusted respectively, the transverse closing of the beam segment is adjusted, and the longitudinal closing movement of the beam segment is promoted, so as to realize the precise adjustment of the closing of the side span closing beam segment, thus solving the problems that the accuracy, stability and sealing of the interfaces of each part of the bridge deck are difficult to control and adjust in the existing assembled side span closing method.

[0029] 2. By setting up a jack pushing mechanism, the load-bearing support rollers are driven to move by the supporting hydraulic cylinder to adjust the closure height of the beam segment. Then, the side pushing block is driven to move by the side pushing drive motor to conduct lateral closure adjustment on the beam segment. Finally, the pushing drive motor and the pushing hydraulic cylinder cooperate to push the beam segment to conduct longitudinal closure movement adjustment, achieving the effect of precise adjustment for the closure of the side-span closure beam segment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of a method for jack-pushing and sliding the side-span closure of a long-span cable-stayed bridge proposed by the present invention;

[0031] Figure 2 Schematic diagram of the position of the deck crane in Step 2 of a method for jack-pushing and sliding the side-span closure of a long-span cable-stayed bridge proposed by the present invention;

[0032] Figure 3 Schematic diagram of the jack pushing mechanism of a method for jack-pushing and sliding the side-span closure of a long-span cable-stayed bridge proposed by the present invention;

[0033] Figure 4 Three-dimensional view of the pushing support structure of a method for jack-pushing and sliding the side-span closure of a long-span cable-stayed bridge proposed by the present invention;

[0034] Figure 5 Three-dimensional view of the supporting hydraulic cylinder structure of a method for jack-pushing and sliding the side-span closure of a long-span cable-stayed bridge proposed by the present invention;

[0035] Figure 6 Three-dimensional view of the load-bearing base structure of a method for jack-pushing and sliding the side-span closure of a long-span cable-stayed bridge proposed by the present invention;

[0036] Figure 7 Front view of the supporting hydraulic cylinder structure of a method for jack-pushing and sliding the side-span closure of a long-span cable-stayed bridge proposed by the present invention;

[0037] Figure 8 Three-dimensional view of the load-bearing support roller structure of a method for jack-pushing and sliding the side-span closure of a long-span cable-stayed bridge proposed by the present invention;

[0038] Figure 9 Schematic diagram of the circumferential joint positioning in Step 4 of a method for jack-pushing and sliding the side-span closure of a long-span cable-stayed bridge proposed by the present invention;

[0039] Figure 10 Schematic diagram of the mid-span closure in Step 7 of a method for jack-pushing and sliding the side-span closure of a long-span cable-stayed bridge proposed by the present invention.

[0040] In the figure: 1. Jacking support; 101. Anti-slip column; 2. Cable-stayed support frame; 3. Support hydraulic cylinder; 4. Support hydraulic rod; 5. Support seat; 6. Load-bearing base; 7. Reinforcing rib; 8. First bearing seat; 9. Load-bearing support roller; 10. Rotating groove; 11. Support ball; 12. Stop limit travel groove; 13. Stop limit block; 14. Side jacking block; 15. Side jacking reducer; 16. Side jacking drive motor; 17. Second bearing seat; 18. Side jacking drive lead screw; 19. Reinforcing fixed mounting plate; 20. Stop guiding column; 21. Movable jacking seat; 22. Jacking drive lead screw; 23. Jacking reducer; 24. Jacking drive motor; 25. Jacking hydraulic cylinder; 26. Jacking hydraulic rod; 27. Wear-resistant contact rubber block. Specific implementation mode

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0042] Refer to Figures 1 - 10 , a method for jacking and sliding the side span closure of a long-span cable-stayed bridge with a jack, comprising the following steps:

[0043] Step 1, deck hoisting. As Figure 1 shown, hoist the S15 beam section through the deck crane. After connecting with the S14 beam section, install and tension the 15th pair of stay cables.

[0044] Step 2, determination of the closure time. As Figure 2 shown, the deck crane does not move forward. Observe the position of the beam section according to the monitoring requirements, and determine the closure time according to the measurement results and monitoring instructions.

[0045] Step 3, jacking and sliding. Use the jacking mechanism of the jack to jack and slide the S16 beam section and finely adjust the beam section.

[0046] Specifically, after fine adjustment, hand it over to the closure beam section (axis requirement: ±10 mm / difference between the front and rear ends does not exceed 3 mm; elevation requirement: ±5 mm / difference between the left and right does not exceed 5 mm; mileage requirement: mileage deviation does not exceed ±10 mm / seam width meets the specification requirements).

[0047] The jacking mechanism of the jack includes a jacking support 1 for jacking positioning and fixing. The jacking support 1 is fixedly installed on the upper surface of the bridge pier column. The lower surface of the jacking support 1 is fixedly connected with a cable-stayed support frame 2. One end of the cable-stayed support frame 2 is fixedly connected with one side surface of the bridge pier column.

[0048] During use, it is fixedly connected to one side surface of the bridge pier column through the stay support frame 2, so as to strengthen the support for the jacking support 1, and provide a stable support adjustment foundation for the side span closure, thereby achieving a better effect of jacking and sliding closure.

[0049] Furthermore, one end of the jacking support 1 is fixedly connected with anti-slip columns 101, and a plurality of anti-slip columns 101 are evenly distributed at one end of the jacking support 1.

[0050] During use, the anti-slip columns 101 have the effect of preventing the closure beam segment from slipping off one end of the jacking support 1 when the side span of the bridge is closed.

[0051] In order to adjust the closure height of the beam segment during closure, a plurality of support hydraulic cylinders 3 symmetrically distributed around the axis of the jacking support 1 are fixedly installed on the upper surface of the jacking support 1. The support hydraulic cylinder 3 includes a support hydraulic rod 4.

[0052] One end of the support hydraulic rod 4 is fixedly connected with a support seat 5 with a circular surface. The upper surface of the support seat 5 is fixedly connected with a load-bearing base 6 with a J-shaped surface. The surface of the support seat 5 is fixedly connected with a plurality of reinforcing ribs 7 distributed in an annular array around the axis of the support seat 5. The surface of the reinforcing ribs 7 is fixedly connected with the lower surface of the load-bearing base 6.

[0053] Two first bearing seats 8 symmetrically distributed around the axis of the load-bearing base 6 are fixedly installed on the upper surface of the load-bearing base 6. The surface of the first bearing seat 8 is rotatably connected with a load-bearing support roller 9 through a bearing. One end of the load-bearing support roller 9 is rotatably connected with the inner wall of the load-bearing base 6 through a bearing.

[0054] When the side span of the bridge is closed, the beam segment is supported by the support hydraulic cylinder 3, the support hydraulic rod 4, the support seat 5, the load-bearing base 6 and the load-bearing support roller 9, and the load-bearing support roller 9 is rotatably connected with the load-bearing base 6, which is convenient for moving and adjusting the closure beam segment.

[0055] A plurality of uniformly distributed rotating grooves 10 are formed on the surface of the load-bearing support roller 9. The inner wall of the rotating groove 10 is rotatably connected with a support ball 11, and the surface of the support ball 11 extends to the surface of the load-bearing support roller 9.

[0056] During use, the load-bearing support roller 9 supports the closure beam segment, which is convenient for longitudinally moving and adjusting the closure beam segment, and the support ball 11 contacts the beam segment, which is convenient for laterally moving and adjusting the closure beam segment, so as to achieve the effect of longitudinally and laterally moving and adjusting the closure beam segment during side span closure.

[0057] The inner top wall of the load-bearing base 6 is provided with two anti-stop limit travel grooves 12 that are symmetrically distributed with the axis of the load-bearing base 6 as the center. The inner wall of the anti-stop limit travel groove 12 is slidably connected with an anti-stop limit block 13. The lower surface of the anti-stop limit block 13 is fixedly connected with a side push block 14 with an M-shaped surface. The lower surface of the side push block 14 is slidably connected with the surface of the load-bearing base 6.

[0058] One end of the load-bearing base 6 is fixedly installed with a side push reducer 15. The surface of the side push reducer 15 is fixedly installed with a side push drive motor 16. The output shaft of the side push drive motor 16 is fixedly connected with the deceleration input end of the side push reducer 15.

[0059] The surface of the load-bearing base 6 is fixedly installed with a second bearing seat 17. The second bearing seat 17 is located between the two first bearing seats 8. The surface of the second bearing seat 17 is rotatably connected with a side push drive screw rod 18 through a bearing. The surface of the side push drive screw rod 18 is threadedly connected with the surface of the side push block 14.

[0060] One end of the side push drive screw rod 18 penetrates and extends to one end of the load-bearing base 6. One end of the side push drive screw rod 18 is fixedly connected with the deceleration output end of the side push reducer 15.

[0061] During use, the side push drive motor 16 drives the side push drive screw rod 18 to rotate through the side push reducer 15. The side push drive screw rod 18 drives the side push block 14 to move, and the side push block 14 is used to push the closure beam segment, and the side push movement of the closure beam segment is adjusted for positioning and closure.

[0062] The surface of the push support 1 is fixedly connected with two symmetrically distributed and strengthened fixed mounting plates 19. The surface of the strengthened fixed mounting plates 19 is fixedly connected with two symmetrically distributed anti-stop guide columns 20. The surface of the anti-stop guide columns 20 is slidably connected with a movable push seat 21.

[0063] The lower surface of the movable push seat 21 is slidably connected with the upper surface of the push support 1. The surface of the movable push seat 21 is threadedly connected with a push drive screw rod 22. Both ends of the push drive screw rod 22 are rotatably connected with the surface of the strengthened fixed mounting plates 19 through bearings.

[0064] The surface of one of the strengthened fixed mounting plates 19 is fixedly installed with a push reducer 23. One end of the push drive screw rod 22 is fixedly connected with the deceleration output end of the push reducer 23.

[0065] The surface of the push reducer 23 is fixedly installed with a push drive motor 24. The output shaft of the push drive motor 24 is fixedly connected with the power input end of the push reducer 23.

[0066] In use, the pushing drive motor 24 drives the pushing drive screw rod 22 to rotate through the pushing speed reducer 23, and the pushing drive screw rod 22 drives the movable pushing seat 21 to move.

[0067] The surface of the movable pushing seat 21 is fixedly installed with pushing hydraulic cylinders 25. The two pushing hydraulic cylinders 25 are symmetrically distributed with the axis of the movable pushing seat 21 as the center. The pushing hydraulic cylinder 25 includes a pushing hydraulic rod 26, and one end of the pushing hydraulic rod 26 is fixedly installed with a wear-resistant contact rubber block 27 for contacting and pushing the closure beam segment.

[0068] Further, the working principle of the jack pushing mechanism is as follows: First, place the beam segment for side span closure on the load-bearing support rollers 9, and then control the multiple support hydraulic rods 4 to extend or retract into the support hydraulic cylinder 3 to drive the support seat 5, the load-bearing base 6, and the load-bearing support rollers 9 to move up and down to adjust the height of the closure beam segment. After the adjustment of the height of the closure beam segment is completed, the side pushing drive motor 16 drives the side pushing drive screw rod 18 to rotate through the side pushing speed reducer 15, and the side pushing drive screw rod 18 drives the side pushing block 14 to move. The closure beam segment is pushed by the side pushing block 14 to perform side pushing movement and adjustment for positioning and closure. Finally, the pushing hydraulic rod 26 in the pushing hydraulic cylinder 25 extends to drive the wear-resistant contact rubber block 27 to move into contact with the bottom of the beam segment. Then, the pushing drive motor 24 drives the pushing drive screw rod 22 to rotate through the pushing speed reducer 23, and the pushing drive screw rod 22 drives the movable pushing seat 21 to move, driving the pushing hydraulic cylinder 25, the pushing hydraulic rod 26, and the wear-resistant contact rubber block 27 to move, driving the beam segment to perform closure adjustment movement.

[0069] By setting the jack pushing mechanism, the load-bearing support rollers 9 are driven by the support hydraulic cylinder 3 to move to adjust the closure height of the beam segment. Then, the side pushing block 14 is driven by the side pushing drive motor 16 to move to perform lateral closure adjustment of the beam segment. Finally, through the cooperation of the pushing drive motor 24 and the pushing hydraulic cylinder 25, the beam segment is pushed to perform longitudinal closure movement adjustment, achieving the effect of fine adjustment of the side span closure beam segment for closure.

[0070] Step Four: Circumferential Joint Positioning. As Figure 9 shown, perform circumferential joint positioning (for pre-welding grinding, the metal luster should be exposed in the range of 20 mm to 30 mm on both sides of the weld; the circumferential joint misalignment adjustment ≤ 1 mm) and circumferential weld welding of the closure beam segment to complete the connection work between the S16 beam segment and the S15 beam segment, realizing the side span closure.

[0071] Step Five: Bearing Grouting. When it is ensured that the beam segment will no longer be adjusted, grout the bearing and remove the bolts on the side of the bearing.

[0072] Step Six: First Weight Loading. First weight loading of the S16 beam segment.

[0073] As Figure 10 shown, in Step Seven, the mid-span is closed. The mid-span crane is moved forward in place, and preparations are made for the mid-span closure.

[0074] By setting Steps One to Seven and cooperating with the jack pushing mechanism, when closing the side span of a long-span cable-stayed bridge, the closure height of the beam segments is adjusted respectively, the lateral closure of the beam segments is adjusted, and the longitudinal closure movement of the beam segments is promoted to realize the fine adjustment of the closure of the side-span closure beam segments, thus solving the problem that it is difficult to control and adjust the accuracy, stability and sealing performance of the interfaces of various parts of the bridge deck in the existing assembled side-span closure method.

[0075] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A method for jacking and sliding the side span closure of a long-span cable-stayed bridge, characterized in that, It includes the following steps: Step 1, Bridge deck hoisting. Hoist the S15 beam segment with a bridge deck crane. After connecting with the S14 beam segment, install and tension the 15th pair of stay cables; Step 2, Determination of the closure time. The bridge deck crane does not move forward. Observe the position of the beam segment according to the monitoring requirements, and determine the closure time according to the measurement results and monitoring instructions; Step 3, Jacking and sliding. Use the jacking mechanism of the jack to jack and slide the S16 beam segment and finely adjust the corresponding beam segment; The jacking mechanism of the jack includes a jacking support (1) for jacking and positioning and fixing. The jacking support (1) is fixedly installed on the upper surface of the bridge pier column. A stay cable support frame (2) is fixedly connected to the lower surface of the jacking support (1). One end of the stay cable support frame (2) is fixedly connected to one side surface of the bridge pier column. A plurality of support hydraulic cylinders (3) symmetrically distributed around the axis of the jacking support (1) are fixedly installed on the upper surface of the jacking support (1). The support hydraulic cylinder (3) includes a support hydraulic rod (4); One end of the support hydraulic rod (4) is fixedly connected to a support seat (5) with a circular surface. A load-bearing base (6) with a J-shaped surface is fixedly connected to the upper surface of the support seat (5). A plurality of reinforcing ribs (7) symmetrically distributed in a circular array around the axis of the support seat (5) are fixedly connected to the surface of the support seat (5). The surface of the reinforcing rib (7) is fixedly connected to the lower surface of the load-bearing base (6); Two first bearing seats (8) symmetrically distributed around the axis of the load-bearing base (6) are fixedly installed on the upper surface of the load-bearing base (6). A load-bearing support roller (9) is rotatably connected to the surface of the first bearing seat (8) through a bearing. One end of the load-bearing support roller (9) is rotatably connected to the inner wall of the load-bearing base (6) through a bearing; A plurality of uniformly distributed rotation grooves (10) are formed on the surface of the load-bearing support roller (9). A support ball (11) is rotatably connected to the inner wall of the rotation groove (10). The surface of the support ball (11) extends to the surface of the load-bearing support roller (9); Two stop limit travel grooves (12) symmetrically distributed around the axis of the load-bearing base (6) are formed on the inner top wall of the load-bearing base (6). A stop limit block (13) is slidably connected to the inner wall of the stop limit travel groove (12). A side jacking block (14) with an M-shaped surface is fixedly connected to the lower surface of the stop limit block (13). The lower surface of the side jacking block (14) is slidably connected to the surface of the load-bearing base (6); A side jacking reducer (15) is fixedly installed at one end of the load-bearing base (6). A side jacking drive motor (16) is fixedly installed on the surface of the side jacking reducer (15). The output shaft of the side jacking drive motor (16) is fixedly connected to the deceleration input end of the side jacking reducer (15); A second bearing block (17) is fixedly installed on the surface of the load-bearing base (6). The second bearing block (17) is located between the two first bearing blocks (8). A side pushing drive screw rod (18) is rotatably connected to the surface of the second bearing block (17) through a bearing. The surface of the side pushing drive screw rod (18) is threadedly connected to the surface of the side pushing block (14); One end of the side pushing drive screw rod (18) penetrates and extends to one end of the load-bearing base (6), and one end of the side pushing drive screw rod (18) is fixedly connected to the decelerating output end of the side pushing speed reducer (15); Two symmetrically distributed and strongly fixedly installed plates (19) are fixedly connected to the surface of the pushing support (1). Two symmetrically distributed stopping and guiding columns (20) are fixedly connected to the surface of the strongly fixedly installed plate (19). An active pushing seat (21) is slidably connected to the surface of the stopping and guiding column (20); The lower surface of the active pushing seat (21) is slidably connected to the upper surface of the pushing support (1). A pushing drive screw rod (22) is threadedly connected to the surface of the active pushing seat (21). Both ends of the pushing drive screw rod (22) are rotatably connected to the surface of the strongly fixedly installed plate (19) through bearings; A pushing speed reducer (23) is fixedly installed on the surface of one of the strongly fixedly installed plates (19). One end of the pushing drive screw rod (22) is fixedly connected to the decelerating output end of the pushing speed reducer (23); A pushing drive motor (24) is fixedly installed on the surface of the pushing speed reducer (23). The output shaft of the pushing drive motor (24) is fixedly connected to the power input end of the pushing speed reducer (23); A pushing hydraulic cylinder (25) is fixedly installed on the surface of the active pushing seat (21). The two pushing hydraulic cylinders (25) are symmetrically distributed with the axis of the active pushing seat (21) as the center. The pushing hydraulic cylinder (25) includes a pushing hydraulic oil rod (26). One end of the pushing hydraulic oil rod (26) is fixedly installed with a wear-resistant contact rubber block (27) for contacting and pushing the closure beam segment; Step 4: Circumferential joint positioning. Perform circumferential joint positioning and circumferential weld welding on the closure beam segment to complete the connection work between the S16 beam segment and the S15 beam segment, realizing the closure of the side span; Step 5: Bearing grouting. When it is ensured that the beam segment will no longer be adjusted, grout the bearing and remove the bolts on the side of the bearing; Step 6: First weight pressing. Perform the first weight pressing on the S16 beam segment; Step 7: Middle span closure. Move the middle span crane forward to the designated position and prepare for the middle span closure.

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