Cushion block for realizing differential pushing of bent bridge of common walking jack

Abstract

The invention discloses a cushion block for realizing differential pushing of a curved bridge of a common walking jack, which comprises a first cushion block and a second cushion block, the first cushion block and the second cushion block are respectively arranged on the walking jack on the inner side and the outer side of the bottom surface of a main beam of the curved bridge, and the first cushion block comprises a first bearing plate; the first bearing plate is placed in the sliding block and can rotate freely. The sliding block is placed in the base, can horizontally move in any direction in the horizontal plane and can automatically reset, the position of the sliding block is adjusted through the crank, and the differential distance in the differential pushing process is achieved. The second cushion block comprises a second bearing plate and a sleeve, the second bearing plate is placed in the sleeve, the structure of the second bearing plate is the same as that of the first bearing plate, and the second bearing plate can rotate freely. The bent bridge differential pushing device can adapt to beam body rotation, transverse displacement and longitudinal differential displacement in the differential pushing process, bent bridge differential pushing can be achieved through an oil pump control system of a common walking type jack, and the ideal state that deviation rectification is almost not needed theoretically is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, in particular to a pad for realizing differential jacking of a curved bridge using a common walking jack. Background Art

[0002] The jacking method is widely used in the construction of continuous beam bridges with uniform cross-sections, including single-point jacking and multi-point jacking. In recent years, the multi-point jacking construction method of walking jacks has been widely used. This method does not affect the traffic and navigation under the bridge, and can be well applied to the jacking construction of straight bridges. In the jacking construction of curved beam bridges, the traditional jacking process is to push forward along the tangent direction of the circular curve first. When the deviation between the beam body and the design line reaches the limit, the horizontal jack is adjusted to correct the deviation. It is necessary to correct the deviation while pushing, which is more difficult. The steel box girder of the Lotus Bridge at Hengqin Port (curve radius 55m) adopts the differential jacking process for the first time. During the curved jacking process, the differential jacking control system is used to make the inner and outer jacks move at the same angular velocity and different linear velocities, so that the jacks on both sides have a jacking stroke difference during the jacking process. However, differential jacking has high requirements on equipment. For example, it requires multiple independent control circuits to individually control each crawler jack to achieve differential speed, or use a central controller to control multiple circuits. This has high performance requirements for the central controller, resulting in the jacking equipment being more expensive and less economical.

[0003] Because the jacking method does not affect traffic under the bridge, it is widely used in cross-line bridge construction. For example, newly built interchanges across existing highways are mostly straight bridges, with only the ramps being curved. In actual construction, ordinary walking jacks are used for jacking construction of straight bridges. For curved bridges, considering their smaller number and construction economy, the jacking setup used for straight bridge construction is generally also used. Therefore, how to improve existing equipment to make it suitable for jacking construction of curved bridges while ensuring good construction efficiency is an urgent problem to be solved. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a pad with simple structure and convenient construction for realizing differential pushing of a curved bridge by a common walking jack.

[0005] The technical solution of the present invention to solve the above technical problems is: a pad for realizing differential pushing of a curved bridge by an ordinary walking jack, comprising a first pad and a second pad, the first pad being arranged on the inner walking jack on the bottom surface of the main beam of the curved bridge, the first pad comprising a first bearing plate, a slider, a base, and a crank; the first bearing plate is placed in the slider and can rotate freely to adapt to the rotation of the bridge during the differential pushing process; the slider is square, the slider is placed in the base, can move horizontally in any direction in the horizontal plane, and automatically reset to adapt to the lateral displacement during the differential pushing process, the longitudinal displacement of the slider can be freely adjusted within the measuring range, and the position of the slider is adjusted by the crank to achieve the differential distance during the differential pushing process; the second pad is arranged on the outer walking jack on the bottom surface of the main beam of the curved bridge, the second pad comprising a second bearing plate and a sleeve, the second bearing plate is placed in the sleeve, the structure of the second bearing plate is the same as that of the first bearing plate, and the second bearing plate can rotate freely to adapt to the rotation of the bridge during the differential pushing process.

[0006] The above-mentioned pad for realizing differential pushing of a bending bridge by an ordinary walking jack, the first bearing plate includes a rubber pad, a perforated top plate, a waterproof sealing ring, a bearing frame, and a perforated bottom plate; the bearing frame is placed on the circular perforated bottom plate, and a bottom plate hole is opened in the middle of the perforated bottom plate, the bearing frame includes an outer frame, an inner frame, a middle hole, and a partition, the outer frame and the inner frame are both cylindrical structures, the inner frame is located in the outer frame and is coaxially arranged with the outer frame, the outer frame and the inner frame are connected by multiple partitions, and the center of the inner frame is a middle hole; the waterproof sealing ring includes a sealing ring and a rain guide strip, the sealing ring and the rain guide strip are integrally manufactured and formed, the rain guide strip is cantilevered outward and tilted downward, and the sealing ring is clamped outside the bearing frame; the circular perforated top plate is placed on the bearing frame, a top plate hole is opened in the middle of the perforated top plate, and a circular rubber pad is padded on the top surface of the perforated top plate.

[0007] The above-mentioned pad for realizing differential pushing of the bending bridge of the ordinary walking jack, the slider includes a slider top plate, a slider bottom plate, a slider limit plate, a slider outer frame, a slider inner frame, a slider screw, and a slider nut; the slider top plate, the slider bottom plate, the slider outer frame, and the slider inner frame are combined to form the overall frame of the slider, the slider top plate is located on the slider outer frame and the slider inner frame, the slider outer frame is rectangular, the slider inner frame is circular, the inner wall of the slider inner frame is smooth, the inner diameter of the slider inner frame is the same as the diameter of the first bearing plate, limiting the translational movement of the first bearing plate so that the first bearing plate can only rotate; the slider limit plates are arranged on both sides of the slider outer frame, the slider screw is welded in the middle position of the skateboard bottom plate, the slider screw diameter is smaller than the bottom plate hole diameter, and the slider nut inscribed circle diameter is larger than the bottom plate hole diameter of the open bottom plate.

[0008] The above-mentioned pad for realizing differential pushing of the bending bridge of the ordinary walking jack, the base includes a frame bottom plate, a limit scale, an air damping spring self-resetting rod, and a hexagonal screw; the direction along the hexagonal screw is the longitudinal direction, and the direction perpendicular to the hexagonal screw is the transverse direction. The two limit scales are symmetrically arranged on both sides of the frame bottom plate along the longitudinal direction, and the air damping spring self-resetting rod and the hexagonal screw are respectively arranged at the two ends of the longitudinal direction of the frame bottom plate.

[0009] The above-mentioned pad for realizing differential pushing of the bending bridge of the ordinary walking jack, the frame bottom plate includes a base side plate, a base bottom plate, a reset rod fixing block, a screw fixing block, a transverse reset spring, a guide groove, a drain hole, and a base lifting ring; the axial direction along the transverse reset spring is the transverse direction, and the axial direction perpendicular to the transverse reset spring is the longitudinal direction. The base side plate is connected to the four sides of the square base bottom plate, and multiple transverse reset springs are fixed on the inner sides of the side plates on both sides of the transverse side plates of the base side plates. Two base lifting rings are provided on the outer sides of the side plates on both sides of the transverse side plates of the base side plates, guide grooves are provided on the inner sides of the side plates at both ends of the longitudinal direction of the base side plates, a reset rod fixing block is provided at one end of the outer side plates at both ends of the longitudinal direction of the base side plates, a screw fixing block is provided at the other end of the side plates at both ends of the longitudinal direction of the base side plates, and drain holes are provided at the four corners of the base bottom plate.

[0010] The above-mentioned pad for realizing differential pushing of the bending bridge of the ordinary walking jack, the limit scale includes a scale rod, a scale, a guide block, a water hole, and a limit groove; the scale rod is a rectangular parallelepiped as a whole, the scale rod height is the same as the base side plate, the scale rod length is the same as the longitudinal width of the base bottom plate, there are scales on the top and side surfaces of both ends of the scale rod, and guide blocks are provided on the two end surfaces in the length direction of the scale rod. The guide blocks are installed in the guide groove to limit the scale to only horizontal sliding. There are water holes at the bottom of the two end surfaces in the length direction of the scale rod, and the limit groove on the bottom surface of the scale rod clamps the slider limit plate, which plays a limiting role on the slider, so that the slider only moves horizontally.

[0011] The pad for realizing differential pushing of a conventional walking jack bending bridge, the air damping spring self-reset rod comprises an outer tube, an inner tube, and a longitudinal reset spring; the outer tube and the inner tube are both hollow cylinders, one end closed and the other end open, the outer diameter of the inner tube is the same as the inner diameter of the outer tube, the inner tube is completely placed in the outer tube, and the longitudinal reset spring is placed in the inner tube to provide elastic restoring force for the longitudinal reset of the slider;

[0012] The outer cylinder includes an outer cylinder wall, an outer cylinder inner wall groove, a semi-sealing ring, and an air vent; the outer cylinder wall is fixed on the reset rod fixing block, and the inner wall of the outer cylinder wall near the open end is provided with an outer cylinder inner wall groove for fixing the semi-sealing ring, and the semi-sealing ring is provided with multiple air vents. By adjusting the number and diameter of the air vents, the air damping size of the air damping spring self-reset rod can be adjusted.

[0013] The above-mentioned pad for realizing differential pushing of the bending bridge of the ordinary walking jack, the hexagonal screw includes a screw and a hexagonal hole; the screw is installed in the screw fixing block, one end of the screw is in contact with the slider, and the other end of the screw has a hexagonal hole. The longitudinal displacement of the screw is adjusted by the crank, thereby adjusting the longitudinal position of the slider to achieve precise control of the differential distance.

[0014] The above-mentioned pad for realizing differential pushing of the bending bridge of the ordinary walking jack, the sleeve includes a sleeve outer frame, a sleeve base plate, a sleeve screw, a sleeve nut, and a sleeve lifting ring; the sleeve outer frame is a cylindrical structure and is welded to the circular sleeve base plate, a plurality of sleeve lifting rings are welded circumferentially on the outer side of the sleeve outer frame, a sleeve screw is welded at the center of the sleeve base plate, and the sleeve nut and the sleeve screw are used in conjunction to fix the second bearing plate.

[0015] The calculation of the differential distance Δ1 of the pads used to achieve differential jacking of a curved bridge using a conventional walking jack is as follows: the arc radius of the first pad is R1, the arc radius of the second pad is R2, and the longitudinal distance of a single jacking is D. The differential distance is:

[0016]

[0017] By adjusting the longitudinal displacement of the screw by the crank, the slider moves longitudinally. The longitudinal distance between the slider and the base side plate is adjusted to a differential distance Δ1. Although the inner and outer walking jacks both push a stroke D, since the first pad is set with a differential distance Δ1, the inner side of the main beam actually only moves D1, D1=D-Δ1. The second pad does not affect the pushing distance, and the outer side of the main beam moves a stroke D, thereby achieving the purpose of differential pushing.

[0018] The beneficial effects of the present invention are as follows: the pads invented for realizing differential jacking of a curved bridge by an ordinary walking jack can adapt to the rotation, lateral displacement and longitudinal differential displacement of the beam body during the differential jacking process, and the oil pump control system of an ordinary walking jack can realize differential jacking of a curved bridge, achieving an ideal state in theory where almost no correction is required, and it can be considered to increase the length of the slideway, increase the longitudinal distance of each jacking, reduce the number of jacking times, and further improve the efficiency of the curved bridge jacking construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the principle of the differential pushing of the curved bridge of the present invention.

[0020] Figure 2 This is a schematic diagram of the three-dimensional structure of the first cushion block of the present invention.

[0021] Figure 3 This is a top view of the first cushion block of the present invention.

[0022] Figure 4It is a front view of the first cushion block of the present invention.

[0023] Figure 5 It is a side view of the first cushion block of the present invention.

[0024] Figure 6 This is a rear view of the first cushion block of the present invention.

[0025] Figure 7 This is a three-dimensional exploded view of the first cushion block of the present invention.

[0026] Figure 8 It is a structural schematic diagram of the first supporting plate of the present invention.

[0027] Figure 9 This is a large sample diagram of the waterproof sealing ring of the present invention.

[0028] Figure 10 Schematic diagram of the cross-sectional structure of the slider of the present invention.

[0029] Figure 11 It is a structural schematic diagram of the base of the present invention.

[0030] Figure 12 It is a structural schematic diagram of the framed bottom plate of the present invention.

[0031] Figure 13 Schematic diagram of the structure of the limit scale of the present invention.

[0032] Figure 14 This is an exploded view of the air damping spring self-reset rod of the present invention.

[0033] Figure 15 It is an exploded view of the outer cylinder of the present invention.

[0034] Figure 16 It is a schematic structural diagram of the hexagonal screw and the crank of the present invention.

[0035] Figure 17 This is a schematic diagram of the three-dimensional structure of the second cushion block of the present invention.

[0036] Figure 18 It is a top view of the second cushion block of the present invention.

[0037] Figure 19 It is a front view of the second cushion block of the present invention.

[0038] Figure 20 This is a three-dimensional exploded view of the second cushion block of the present invention.

[0039] Figure 21 It is a structural schematic diagram of the sleeve of the present invention.

[0040] Figure 22 This is a planar layout of the cushion blocks for the jacking construction of a curved bridge according to the present invention.

[0041] Figure 23 This is a horizontal layout diagram of the cushion blocks for the jacking construction of a curved bridge according to the present invention.

[0042] Figure 24 Schematic diagram of the differential displacement adjustment of the first pad before the curved bridge is pushed.

[0043] Figure 25 This is a schematic diagram of the position of the first pad slide box after the curved bridge is pushed.

[0044] Figure 26 This is a schematic diagram of the displacement of the inner beam during the jacking construction of the curved bridge according to the present invention.

[0045] Figure 27 This is a schematic diagram of the displacement of the outer beam during the jacking construction of the curved bridge according to the present invention. DETAILED DESCRIPTION

[0046] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0047] Figure 1 In the figure, O represents the center of the curved bridge, R1 and R2 represent the arc radius of the inner and outer jack positions respectively, and the inner and outer pushing jacks are placed at points n1 and n2 respectively. The ideal state is to push them to points n3 and n4 respectively. The walking jack can only move in a straight line, and the pushing path is not along the arc S1 and S2. Assume that the jack at n2 pushes along the secant L1, and L2 is the inner arc secant parallel to L1. The inner jack does not push along L2 because at the initial position, the distance between the inner and outer jacks is B. During the pushing process, the distance will remain unchanged. When the outer jack walks to n i At point n, the inner jack is at j Point position, n j The point is located at the intersection of the L4 line and the n i At the intersection of the circle with B as the center and B as the radius, the L4 line is from point O to n i The connection of the points, at this time, can ensure that n i Point to n j The distance between points is B, and the distance traveled by the inner and outer jacks also satisfies the differential ratio R1:R2. jThe polyline formed by connecting the points is denoted as L3, which is a curve. Because the jacking jacks can only be arranged along a straight line, the inner jacks can only be arranged along the secant line. At this time, the lateral distance Δ2 between L2 and L3 is not applicable to traditional walking jacks. At the same time, the beam body will undergo significant rotation during the jacking process, as shown by the angle θ in the figure. Traditional walking jacks limit this rotation angle. When using traditional walking jacks for jacking at the same part, the outer jack travels a distance D to reach point n4, and the inner jack also travels a distance D to reach point n5. The distance between points n1 and n3 is D1, and the distance between points n3 and n5 is Δ1, where D = D1 + Δ1. If the inner jack travels less than Δ1, it will be exactly on the arc, thus meeting the differential jacking requirements. The differential jacking method achieves the purpose of differential speed by controlling the travel distance of the inner and outer jacks. Based on the principle of differential jacking, a pad was invented to realize differential jacking of the ordinary walking jack bending bridge, thereby achieving the differential jacking effect.

[0048] like Figure 2-Figure 7 、 Figure 16 As shown, a pad for realizing differential jacking of a curved bridge by an ordinary walking jack comprises a first pad 1 and a second pad 2. The first pad 1 is arranged on the walking jack on the inner side of the bottom surface of the main beam of the curved bridge. The first pad 1 comprises a first bearing plate 11, a slider 12, a base 13, and a crank 14. The first bearing plate 11 is cylindrical and is placed in the slider 12. The first bearing plate 11 can rotate freely to adapt to the rotation of the bridge during the differential jacking process. The slider 12 is square and is placed in the base 13. It can move in any direction in the horizontal plane and automatically reset to adapt to the lateral displacement during the differential jacking process. The longitudinal displacement of the slider can be freely adjusted within the range. The position of the slider 12 is adjusted by the crank 14 to realize the differential distance Δ1 during the differential jacking process.

[0049] like Figures 8-10As shown, the first bearing plate 11 includes a rubber pad 111, a perforated top plate 112, a waterproof sealing ring 113, a bearing frame 114, and a perforated bottom plate 115; the bearing frame 114 is placed on the circular perforated bottom plate 115, and the perforated bottom plate 115 includes a bearing plate bottom plate 1152, and a bottom plate hole 1151 is opened in the middle of the bearing plate bottom plate 1152. The diameter of the bottom plate hole 1151 is slightly larger than the diameter of the slider screw 126 and smaller than the diameter of the inscribed circle of the slider nut 127. The thickness of the bottom plate 1152 meets the load-bearing requirements; the load-bearing frame 114 includes an outer frame 1141, an inner frame 1142, a middle hole 1143, and a partition 1144. The outer frame 1141 and the inner frame 1142 are both cylindrical structures. The inner frame 1142 is located in the outer frame 1141 and is coaxially arranged with the outer frame 1141. The outer frame 1141 and the inner frame 1142 are connected by multiple partitions 1144. The outer frame 1141, the inner frame 1142, and the partition 1144 are connected. The height is the same, the center of the inner frame 1142 is the middle hole 1143, the outer diameter of the outer frame 1141 is the same as the diameter of the hole top plate 112, and the diameter of the middle hole 1143 is the same as the diameter of the top plate hole 1121 of the load-bearing plate; the waterproof sealing ring 113 includes a sealing ring 1131 and a rain guide strip 1132, the sealing ring 1131 and the rain guide strip 1132 are integrally formed and have good elasticity and waterproof performance, the rain guide strip 1132 is cantilevered outward and tilted downward, and the sealing ring 1131 is clamped at The outside of the carrying frame 114 plays a role in waterproofing and dustproofing; the circular perforated top plate 112 is placed on the carrying frame 114, and a top plate hole 1121 is opened in the middle of the perforated top plate 112. The diameter of the top plate hole 1121 is 5 to 10 cm. The unperforated part is the carrying plate top plate 1122, and the thickness meets the load-bearing requirements; the rubber pad 111 is a circular rubber sheet with a thickness of 2 to 8 mm. The rubber pad 111 is placed on the top surface of the perforated top plate 112, and its diameter is slightly larger than that of the perforated top plate 112.

[0050] like Figure 10As shown, the slider 12 includes a slider top plate 121, a slider bottom plate 122, a slider limiting plate 123, a slider outer frame 124, a slider inner frame 125, a slider screw 126, and a slider nut 127; the slider top plate 121, the slider bottom plate 122, the slider outer frame 124, and the slider inner frame 125 constitute the overall frame of the slider 12, the slider top plate 121 is located on the slider outer frame 124 and the slider inner frame 125, the slider outer frame 124 is rectangular, the slider inner frame 125 is circular, the inner wall of the slider inner frame 125 is smooth, and the inner diameter of the slider inner frame 125 is the same as the diameter of the first bearing plate 11, limiting the first The translational movement of the supporting plate 11 makes the first supporting plate 11 only able to rotate. The top of the slider inner frame 125 is slightly higher than the skateboard top plate 121, and is wedge-shaped, with high inside and low outside, which is convenient for waterproofing and drainage; the skateboard bottom plate 122 is smooth, which is convenient for the rotation of the first supporting plate 11; the slider limit plates 123 are arranged on both sides of the slider outer frame 124, the slider screw 126 and the slider nut 127 are used to limit the first supporting plate 11, and the slider screw 126 is welded to the middle position of the skateboard bottom plate 122. The diameter of the slider screw 126 is smaller than the diameter of the bottom plate hole 1151, and the diameter of the inscribed circle of the slider nut 127 is larger than the diameter of the bottom plate hole of the open bottom plate 115. First remove the slider nut 127, install the first carrier plate 11, and then tighten the slider nut 127. The height of the unscrewed portion of the slider screw 126 is greater than the thickness of the carrier plate bottom plate 1152, so that when the slider nut 127 is tightened, the slider nut 127 will not press on the carrier plate bottom plate 1152, ensuring that the first carrier plate 11 can rotate freely.

[0051] like Figure 11 As shown, the base 13 includes a framed bottom plate 131, a limit scale 132, an air damping spring self-reset rod 133, and a hexagonal screw 134; the direction along the hexagonal screw 134 is the longitudinal direction, and the direction perpendicular to the hexagonal screw 134 is the transverse direction. The two limit scales 132 are symmetrically arranged on both sides of the framed bottom plate 131 along the longitudinal direction, the air damping spring self-reset rod 133 and the hexagonal screw 134 are respectively arranged at the two ends of the longitudinal direction of the framed bottom plate 131, the air damping spring self-reset rod 133 is used to reset the slider 12, and the hexagonal screw 134 is used to adjust the longitudinal position of the slider 12 to achieve different differential distances Δ1.

[0052] like Figure 12As shown, the framed bottom plate 131 includes a base side plate 1311, a base bottom plate 1312, a reset rod fixing block 1313, a screw fixing block 1314, a transverse reset spring 1315, a guide groove 1316, a drain hole 1317, and a base hanging ring 1318; the axial direction of the transverse reset spring 1315 is the transverse direction, and the axial direction perpendicular to the transverse reset spring 1315 is the longitudinal direction. The base side plate 1311 is connected to the four sides of the square base bottom plate 1312. Multiple transverse reset springs 1315 are fixed to the inner sides of the side plates on both sides of the base side plate 1311. The transverse reset springs 1315 are used for transverse reset of the slider 12; Two base lifting rings 1318 are provided on the outer sides of the two horizontal side panels of the base side panel 1311 for the overall movement of the first cushion block 1; guide grooves 1316 are provided on the inner sides of the two longitudinal end side panels of the base side panel 1311 for guiding and limiting the limit scale 132; a reset rod fixing block 1313 is provided at one end of the outer sides of the two longitudinal end side panels of the base side panel 1311 for fixing the air damping spring self-reset rod 133, and a screw fixing block 1314 is provided at the other end of the two longitudinal end side panels of the base side panel 1311 for fixing the hexagonal screw 134, and drain holes 1317 are provided at the four corners of the base bottom plate 1312 for drainage to prevent water accumulation in the base 13.

[0053] like Figure 13 As shown, the limit scale 132 includes a scale rod 1321, a scale 1322, a guide block 1323, a water hole 1324, and a limit groove 1325; the scale rod 1321 is a rectangular parallelepiped as a whole, with a narrow width, the height of the scale rod 1321 is the same as the base side plate 1311, the length of the scale rod 1321 is the same as the longitudinal width of the base bottom plate 1312, and there are scales 1322 on the top and side surfaces of both ends of the scale rod 1321. The minimum scale of the scale 1322 is mm, which is used to control To adjust the differential distance Δ1, guide blocks 1323 are provided on both end faces of the scale rod 1321 in the length direction. The guide blocks 1323 are installed in the guide groove 1316 to limit the scale 1322 to only horizontal sliding. There are water holes 1324 at the bottom of both end faces in the length direction of the scale rod 1321 to facilitate drainage of the base 13. The limit groove 1325 on the bottom surface of the scale rod 1321 clamps the slider limit plate 123, which limits the slider 12 and makes the slider 12 only move in a linear manner.

[0054] like Figure 14 As shown, the air damping spring self-reset rod 133 includes an outer cylinder 1331, an inner cylinder 1332, and a longitudinal reset spring 1333; the outer cylinder 1331 and the inner cylinder 1332 are both hollow cylinders, one end of which is closed and the other end is open, the outer diameter of the inner cylinder 1332 is the same as the inner diameter of the outer cylinder 1331, the inner cylinder 1332 is completely placed in the outer cylinder 1331, and the longitudinal reset spring 1333 is placed in the inner cylinder 1332 to provide elastic restoring force for the longitudinal reset of the slider 12.

[0055] like Figure 15As shown, the outer cylinder 1331 includes an outer cylinder wall 13311, an outer cylinder inner wall groove 13312, a semi-sealing ring 13313, and an air vent 13314; the outer cylinder wall 13311 is fixed on the reset rod fixing block 1313, and the outer cylinder wall 13311 has an outer cylinder inner wall groove 13312 on the inner wall near the open end for fixing the semi-sealing ring 13313, and the semi-sealing ring 13313 has multiple air vents 13314. By adjusting the number and diameter of the air vents 13314, the air damping size of the air damping spring self-reset rod 133 is adjusted, so that the reset process of the slider 12 is smoother, the impact on the hexagonal screw 134 is small, and it can be accurately reset. There is no need to readjust the differential distance Δ1 even after multiple consecutive pushes, which facilitates construction.

[0056] like Figure 16 As shown, the hexagonal screw 134 includes a screw 1341 and a hexagonal hole 1342; the screw 1341 is installed in the screw fixing block 1314, one end of the screw 1341 is in contact with the slider 12, and the other end of the screw 1341 has a hexagonal hole 1342. The longitudinal displacement of the screw 1341 is adjusted by the crank 14, thereby adjusting the longitudinal position of the slider 12 to achieve precise control of the differential distance.

[0057] like Figures 17-20 As shown, the second pad 2 is arranged on the outer walking jack on the bottom surface of the main beam of the curved bridge. The second pad 2 includes a second bearing plate 21 and a sleeve 22. The second bearing plate 21 is placed in the sleeve 22. The structure of the second bearing plate 21 is the same as that of the first bearing plate 11. The second bearing plate 21 can rotate freely to adapt to the rotation of the bridge during the differential pushing process.

[0058] like Figure 21 As shown, the sleeve 22 includes a sleeve outer frame 221, a sleeve bottom plate 222, a sleeve screw 223, a sleeve nut 224, and a sleeve hanging ring 225; the sleeve outer frame 221 is a cylindrical structure and is welded to the circular sleeve bottom plate 222, and a plurality of sleeve hanging rings 225 are welded circumferentially on the outer side of the sleeve outer frame 221 for the overall movement of the second pad 2; a sleeve screw 223 is welded in the center of the sleeve bottom plate 222, and the sleeve nut 224 is used in conjunction with the sleeve screw 223 to fix the second bearing plate 21.

[0059] like Figure 22 、 Figure 23 As shown, the jacking bridge 3 includes an inner main beam 31, an outer main beam 32, and a cross beam 33; the cross beam 33 is welded between the inner main beam 31 and the outer main beam 32, and the walking jack 4 is placed on the foundation 5. Two walking jacks 4 are arranged in each group. The first pad 1 is placed on the walking jack 4 under the inner main beam 31, and the second pad 2 is placed on the walking jack 4 under the outer main beam 32. The walking jack 4 is placed along the arc secant direction of the outer main beam 32 of the curved bridge, as shown in FIG. Figure 1In the L1 direction, multiple groups of walking jacks are arranged longitudinally with appropriate longitudinal spacing.

[0060] The calculation of the differential distance Δ1 is as follows: the arc radius at the position of the first pad 1 is R1, the arc radius at the position of the second pad 2 is R2, and the longitudinal distance of a single push is D. Then the differential distance is:

[0061]

[0062] like Figure 23 As shown in the figure, the transverse distance between the inner main beam 31 and the outer main beam 32 is 5.8m, and the radius of the central circle of the curved bridge is 150m. Then R1 = 150-5.8 / 2 = 147.1m, R2 = 150+5.8 / 2 = 152.9m, and the longitudinal distance D of a single push is 500mm. Then the differential distance is:

[0063]

[0064] like Figure 24 As shown, the longitudinal displacement of the screw rod 1341 is adjusted by the crank 14 to move the slider 12 longitudinally. The longitudinal distance between the slider 12 and the base side plate 1311 of the base 13 is adjusted to a differential distance Δ1. During the pushing process, the slider 12 moves toward the end of the air damping spring self-reset rod 133, as shown in FIG. Figure 25 shown.

[0065] like Figure 26 As shown in FIG, although both the inner and outer walking jacks push a stroke D, the first pad 1 is set with a differential distance Δ1, so that the inner side of the main beam actually only moves D1, D1 = D-Δ1, as shown in FIG. Figure 27 As shown, the second pad 2 does not affect the pushing distance, and the outer side of the main beam moves a stroke D, thereby achieving the purpose of differential pushing.

Claims

1. A pad for realizing differential pushing of a bending bridge by a common walking jack, comprising a first pad and a second pad, characterized in that: The first pad is arranged on the inner walking jack of the bottom surface of the main beam of the curved bridge, and the first pad includes a first bearing plate, a slider, a base, and a crank; the first bearing plate is placed in the slider and can rotate freely to adapt to the rotation of the bridge during the differential pushing process; the slider is square, and the slider is placed in the base. It can move in any direction in the horizontal plane and automatically reset to adapt to the lateral displacement during the differential pushing process. The longitudinal displacement of the slider can be freely adjusted within the measuring range. The position of the slider is adjusted by the crank to achieve the differential distance during the differential pushing process; the second pad is arranged on the outer walking jack of the bottom surface of the main beam of the curved bridge, and the second pad includes a second bearing plate and a sleeve. The second bearing plate is placed in the sleeve. The structure of the second bearing plate is the same as that of the first bearing plate. The second bearing plate can rotate freely to adapt to the rotation of the bridge during the differential pushing process.

2. The pad for realizing differential pushing of a curved bridge by a common walking jack according to claim 1 is characterized in that: The first supporting plate includes a rubber pad, a perforated top plate, a waterproof sealing ring, a supporting frame, and a perforated bottom plate; the supporting frame is placed on the circular perforated bottom plate, and a bottom plate hole is opened in the middle of the perforated bottom plate. The supporting frame includes an outer frame, an inner frame, a middle hole, and a partition. The outer frame and the inner frame are both cylindrical structures. The inner frame is located in the outer frame and is coaxially arranged with the outer frame. The outer frame and the inner frame are connected by multiple partitions, and the center of the inner frame is a middle hole; the waterproof sealing ring includes a sealing ring and a rain guide strip, which are integrally manufactured and formed. The rain guide strip is cantilevered outward and tilted downward, and the sealing ring is clamped outside the supporting frame; the circular perforated top plate is placed on the supporting frame, a top plate hole is opened in the middle of the perforated top plate, and a circular rubber pad is padded on the top surface of the perforated top plate.

3. The pad for realizing differential pushing of a curved bridge by a common walking jack according to claim 2, characterized in that: The slider includes a slider top plate, a slider bottom plate, a slider limit plate, a slider outer frame, a slider inner frame, a slider screw, and a slider nut; the slider top plate, the slider bottom plate, the slider outer frame, and the slider inner frame are combined to form the overall frame of the slider, the slider top plate is located on the slider outer frame and the slider inner frame, the slider outer frame is rectangular, the slider inner frame is circular, the inner wall of the slider inner frame is smooth, the inner diameter of the slider inner frame is the same as the diameter of the first bearing plate, limiting the translational movement of the first bearing plate so that the first bearing plate can only rotate; the slider limit plates are arranged on both sides of the slider outer frame, the slider screw is welded in the middle position of the slider bottom plate, the slider screw diameter is smaller than the bottom plate hole diameter, and the slider nut inscribed circle diameter is larger than the bottom plate hole diameter of the open bottom plate.

4. The pad for realizing differential pushing of a curved bridge by a common walking jack according to claim 3 is characterized in that: The base includes a framed bottom plate, a limit scale, an air damping spring self-reset rod, and a hexagonal screw; the direction along the hexagonal screw is the longitudinal direction, and the direction perpendicular to the hexagonal screw is the transverse direction. The two limit scales are symmetrically arranged on both sides of the framed bottom plate along the longitudinal direction, and the air damping spring self-reset rod and the hexagonal screw are respectively arranged at both ends of the longitudinal direction of the framed bottom plate.

5. The pad for realizing differential pushing of a curved bridge by a common walking jack according to claim 4 is characterized in that: The frame bottom plate includes a base side plate, a base bottom plate, a reset rod fixing block, a screw fixing block, a transverse reset spring, a guide groove, a drain hole, and a base hanging ring; the direction along the axis of the transverse reset spring is transverse, and the direction perpendicular to the axis of the transverse reset spring is longitudinal. The base side plate is connected to the four sides of the square base bottom plate, multiple transverse reset springs are fixed on the inner sides of the side plates on both sides of the transverse side plates of the base side plate, two base hanging rings are provided on the outer sides of the side plates on both sides of the transverse side plates of the base side plate, guide grooves are provided on the inner sides of the side plates at both ends of the longitudinal direction of the base side plate, a reset rod fixing block is provided at one end of the outer side of the side plates at both ends of the longitudinal direction of the base side plate, a screw fixing block is provided at the other end of the side plates at both ends of the longitudinal direction of the base side plate, and drain holes are provided at the four corners of the base bottom plate.

6. The pad for realizing differential pushing of a curved bridge by a common walking jack according to claim 5 is characterized in that: The limit scale includes a scale rod, a scale, a guide block, a water hole, and a limit groove; the scale rod is a rectangular parallelepiped as a whole, the height of the scale rod is the same as the side plate of the base, the length of the scale rod is the same as the longitudinal width of the bottom plate of the base, and there are scales on the top and side surfaces of both ends of the scale rod. Guide blocks are provided on both end surfaces in the length direction of the scale rod, and the guide blocks are installed in the guide groove to limit the scale to only horizontal sliding. There are water holes at the bottom of both end surfaces in the length direction of the scale rod, and the limit groove on the bottom surface of the scale rod clamps the slider limit plate to limit the slider so that the slider only moves horizontally.

7. The pad for realizing differential pushing of a curved bridge by a common walking jack according to claim 5 is characterized in that: The air damping spring self-reset rod includes an outer tube, an inner tube, and a longitudinal reset spring; the outer tube and the inner tube are both hollow cylinders, one end of which is closed and the other end is open; the outer diameter of the inner tube is the same as the inner diameter of the outer tube, and the inner tube is completely placed in the outer tube. The longitudinal reset spring is placed in the inner tube to provide elastic restoring force for the longitudinal reset of the slider; The outer cylinder includes an outer cylinder wall, an outer cylinder inner wall groove, a semi-sealing ring, and an air vent; the outer cylinder wall is fixed on the reset rod fixing block, and the inner wall of the outer cylinder wall near the open end is provided with an outer cylinder inner wall groove for fixing the semi-sealing ring, and the semi-sealing ring is provided with multiple air vents. By adjusting the number and diameter of the air vents, the air damping size of the air damping spring self-reset rod can be adjusted.

8. The pad for realizing differential pushing of a curved bridge by a common walking jack according to claim 5 is characterized in that: The hexagonal screw includes a screw and a hexagonal hole; the screw is installed in a screw fixing block, one end of the screw is in contact with the slider, and the other end of the screw has a hexagonal hole. The longitudinal displacement of the screw is adjusted by the crank, thereby adjusting the longitudinal position of the slider to achieve precise control of the differential distance.

9. The pad for realizing differential pushing of a curved bridge by a common walking jack according to claim 5 is characterized in that: The sleeve includes a sleeve outer frame, a sleeve base plate, a sleeve screw, a sleeve nut, and a sleeve lifting ring; the sleeve outer frame is a cylindrical structure and is welded to the circular sleeve base plate, a plurality of sleeve lifting rings are welded circumferentially on the outer side of the sleeve outer frame, a sleeve screw is welded in the center of the sleeve base plate, and the sleeve nut and the sleeve screw are used together to fix the second bearing plate.

10. The pad for realizing differential pushing of a curved bridge by a common walking jack according to claim 8, characterized in that: The calculation of the differential distance Δ1 is as follows: the arc radius of the first pad position is R1, the arc radius of the second pad position is R2, and the longitudinal distance of a single push is D. Then the differential distance is: By adjusting the longitudinal displacement of the screw by the crank, the slider moves longitudinally. The longitudinal distance between the slider and the base side plate is adjusted to a differential distance Δ1. Although the inner and outer walking jacks both push a stroke D, since the first pad is set with a differential distance Δ1, the inner side of the main beam actually only moves D1, D1=D-Δ1. The second pad does not affect the pushing distance, and the outer side of the main beam moves a stroke D, thereby achieving the purpose of differential pushing.

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