Single-span steel truss girder dragging construction technology

Abstract

The present application relates to the field of bridge dragging construction technology, and discloses a single-span steel truss dragging construction process, which includes the following steps: S1, multiple temporary support piers are constructed, and a dragging winch and multiple sets of propulsion devices are installed. The push-pull winch is located on the temporary support pier at the front end of the dragging direction, and the multiple sets of propulsion devices are respectively located on the remaining multiple temporary support piers; S2, the guide beam and a hole steel truss are hoisted to the temporary support pier and assembled, and the guide beam is located at the front end of the steel truss along the dragging direction to form a beam body; S3, the beam body is dragged by the dragging winch, and the beam body is pushed by the propulsion device at the same time; S4, the steel truss is continued to be assembled at the rear end of the steel truss along the dragging direction to lengthen the beam body, and S3 is repeated until the assembly of all hole steel trusses is completed; S5, the formal support is installed, the temporary support pier, the dragging winch and the propulsion device are removed, and the beam body is dropped onto the formal support. The present application has the effect of reducing the impact on the service life of the dragging winch.

Description

Technical Field

[0001] The present application relates to the field of bridge dragging construction technology, and in particular to a single-span steel truss dragging construction process. Background Art

[0002] A steel truss bridge is a bridge that uses a truss as the main upper load-bearing member. The steel truss beam structure mainly includes the main truss, connection system, bridge deck system, and support, etc. During construction, the steel truss will produce deflection under the action of load, so the steel truss will be preset with a camber when it is manufactured to offset the deflection generated during construction.

[0003] When constructing a steel truss bridge, the dragging construction method is usually used. First, the guide beam and the steel truss are assembled into a full-span beam body, and then the full-span beam body is longitudinally dragged to the bridge pier by a winch. Finally, the guide beam is removed, thus completing the dragging construction of the steel truss bridge.

[0004] With respect to the above-mentioned related technologies, the inventors found that when dragging a steel truss beam, since the entire beam body needs to be dragged, the entire beam body is extremely heavy, causing the steel wire rope of the winch to be subjected to great stress and easily break, thereby affecting the service life of the towing winch. Summary of the invention

[0005] In order to reduce the impact on the service life of the traction winch, the present application provides a single-span steel truss traction construction process.

[0006] In the first aspect, the single-span steel truss girder dragging construction process provided by the present application adopts the following technical solution:

[0007] The single-span steel truss girder dragging construction process is characterized by comprising the following steps:

[0008] S1, construction of multiple temporary support piers, installation of traction winches and multiple propulsion devices, the traction winches are located on the temporary support pier at the front end along the traction direction, and the multiple propulsion devices are located on the remaining multiple temporary support piers;

[0009] S2, hoisting the guide beam and a steel truss beam to the temporary support pier and completing the assembly, the guide beam is located at the front end of the steel truss beam along the pulling direction to form the beam body;

[0010] S3, using a traction winch to tow the beam body, and simultaneously using a propulsion device to propel the beam body;

[0011] S4, continue to assemble the steel truss beam at the rear end of the steel truss beam along the pulling direction to lengthen the beam body, and repeat S3 until the assembly of the steel truss beams of all holes is completed;

[0012] S5, install the formal support, remove the temporary support pier, hauling winch and propulsion device, and drop the beam onto the formal support;

[0013] Based on S1, the propulsion device includes a jacking assembly and a propulsion assembly, the jacking assembly is located on the top surface of the temporary support pier, the propulsion assembly is slidably connected to the jacking assembly along the towing direction, the jacking assembly is used to lift the beam body, and the propulsion assembly is used to propel the beam body along the towing direction.

[0014] By adopting the above technical scheme, firstly, multiple temporary support piers are set along the towing direction, a towing winch is set on the temporary support pier at the front end along the towing direction, and a set of propulsion devices are installed on the other temporary support piers; then the guide beam and the steel truss are hoisted onto the temporary support pier, and the beam assembly is completed; the propulsion device is used to first lift the beam, and then the beam is pushed along the towing direction, and the towing winch is used to tow the beam at the same time. After the towing is completed, the beam falls back; after completing a towing process, the steel truss is assembled to lengthen the beam, and the towing process is repeated until the assembly and towing of the entire steel truss are completed; formal bearings are installed on the piers, and the temporary support piers, The traction winch and the propulsion device are removed, and the beam is dropped onto the formal support, thereby completing the traction construction of the beam; compared with only using the traction winch to drag the beam, a propulsion device is added to propel the beam in the traction direction while dragging the beam, which greatly shares the force on the wire rope when the traction winch is dragging, making it easier for the traction winch to drag the beam and reducing the impact on the service life of the traction winch; at the same time, the method of assembling steel trusses section by section is adopted, and compared with dragging the entire steel truss, the weight of the beam is greatly reduced, and at the same time, the force on the wire rope when the traction winch is dragging is reduced, which also reduces the impact on the service life of the traction winch.

[0015] In a second aspect, the present application also provides a propulsion device, which adopts the following technical solution:

[0016] The jacking assembly includes a jacking hydraulic cylinder, which is arranged on the top surface of the temporary support pier. A support box is arranged on the jacking hydraulic cylinder. The propulsion assembly includes a propulsion hydraulic cylinder, which is arranged on the support box. A propulsion plate is slidably connected to the support box along the dragging direction of the beam body. The propulsion plate abuts against the bottom surface of the beam body, and the propulsion hydraulic cylinder is used to push the propulsion plate to slide.

[0017] By adopting the above technical scheme, the lifting hydraulic cylinder is started, the lifting hydraulic cylinder drives the supporting box to rise, the supporting box drives the propulsion plate to rise, and the propulsion plate drives the beam to rise; the traction winch and the propulsion hydraulic cylinder are started, the traction winch drags the beam along the traction direction, and at the same time the propulsion hydraulic cylinder pushes the propulsion plate to slide along the traction direction, and the propulsion plate drives the beam to slide along the traction direction, thereby completing the traction of the beam. In the process of the traction winch dragging the beam, the beam is also pushed, thereby reducing the force on the wire rope of the traction winch and reducing the impact on the service life of the traction winch.

[0018] Optionally, the propulsion device also includes a height adjustment component and a pad lifting component. The height adjustment component is located below the support box, the height adjustment component is used to adjust the elevation of the jacking hydraulic cylinder, and the pad lifting component is slidably connected in the height adjustment component. When the pad lifting component slides to below the jacking hydraulic cylinder, the pad lifting component is used to support the jacking hydraulic cylinder.

[0019] By adopting the above technical solution, when the camber of the steel truss changes, the lifting elevation of the lifting hydraulic cylinder changes. At this time, the height adjustment component is used to lift the support box. When it is lifted to the elevation, the pad assembly slides out of the height adjustment component and slides under the lifting hydraulic cylinder to support the lifting hydraulic cylinder, thereby completing the adjustment of the lifting elevation of the lifting hydraulic cylinder.

[0020] Optionally, the height adjustment component includes a support seat, which is located on the top surface of the temporary support pier and below the support box. A height adjustment hydraulic cylinder is arranged in the support seat, and the height adjustment hydraulic cylinder is used to lift the support box.

[0021] By adopting the above technical solution, the height adjustment hydraulic cylinder is started, and the height adjustment hydraulic cylinder lifts the support box, so that the jacking hydraulic cylinder is separated from the top surface of the temporary support pier. When the jacking hydraulic cylinder rises to a height higher than the pad assembly, the pad assembly slides to the bottom of the jacking hydraulic cylinder, thereby supporting the jacking hydraulic cylinder.

[0022] Optionally, the pad assembly includes a moving seat, a guide groove is provided in the support seat, a push spring is fixedly connected in the guide groove, and when the moving seat is located in the guide groove, the push spring is in a compressed state.

[0023] By adopting the above technical solution, when the jacking hydraulic cylinder is located on the top surface of the temporary supporting pier, the moving seat is located in the guide groove. As the jacking hydraulic cylinder is gradually lifted, when the distance between the jacking hydraulic cylinder and the top surface of the temporary supporting pier is greater than the height of the moving seat, the moving seat slides out of the guide groove due to the thrust of the pushing spring and slides to the bottom of the jacking hydraulic cylinder, thereby supporting the jacking hydraulic cylinder.

[0024] Optionally, the cushion assembly further comprises two guide rods, both of which are fixedly connected to the top surface of the temporary support pier, the length direction of the guide rods is parallel to the direction in which the guide grooves are opened, the guide rods are located below the lifting hydraulic cylinder, and the movable seat is slidably connected between the two guide rods.

[0025] By adopting the above technical solution, the moving seat is slidably connected between the two guide rods along the length direction of the guide rods, and the two guide rods guide the sliding of the moving seat, thereby improving the sliding stability of the moving seat.

[0026] Optionally, the pad assembly further includes an electric cylinder and a bearing plate, wherein the electric cylinder is disposed in a movable seat, the electric cylinder is axially vertically disposed, the bearing plate is disposed at the top end of the electric cylinder piston rod, and the bearing plate is located below the lifting hydraulic cylinder.

[0027] By adopting the above technical solution, when the bottom elevation of the jacking hydraulic cylinder is adjusted, the jacking hydraulic cylinder stops rising, and the piston rod of the electric cylinder extends upward to press the bearing plate and the bottom surface of the jacking hydraulic cylinder tightly, thereby stopping the moving seat from sliding and fixing the moving seat.

[0028] Optionally, a screw is slidably connected inside the movable seat, the movable seat is axially vertically arranged, the screw is threadedly connected to the movable seat, the top end of the screw extends out of the movable seat and is fixedly connected to the bottom surface of the supporting plate, and a pressure sensor is installed on the top surface of the supporting plate, and the pressure sensor is used to control the opening and closing of the electric cylinder.

[0029] By adopting the above technical solution, the screw slides upward, driving the load-bearing plate to slide upward, and at the same time the piston rod of the electric cylinder extends upward to support the load-bearing plate. When the load-bearing plate slides to abut against the bottom surface of the lifting hydraulic cylinder, the pressure sensor controls the electric cylinder to close. At this time, the electric cylinder presses the load-bearing plate and the lifting hydraulic cylinder tightly, thereby completing the control of the opening and closing of the electric cylinder. The operation is simple and convenient; at the same time, it also completes the support of the lifting hydraulic cylinder and completes the adjustment of the elevation of the lifting hydraulic cylinder.

[0030] Optionally, a turbine is rotatably connected inside the movable seat, the screw is coaxially arranged with the turbine and threadedly connected, a worm is rotatably connected inside the movable seat, the axial direction of the worm is perpendicular to the axial direction of the screw, one end of the worm extends out of the movable seat and is coaxially fixedly connected with a driving gear, one of the guide rods is provided with a rack, and the driving gear is meshed with the rack.

[0031] By adopting the above technical solution, during the sliding process of the moving seat, since the driving gear is engaged with the rack, the driving gear rotates, the driving gear drives the worm to rotate, the worm drives the turbine to rotate, the turbine drives the screw to slide upward, and the screw drives the bearing plate to slide upward, thereby completing the driving of the bearing plate.

[0032] Optionally, a rotating cylinder is coaxially fixedly connected to the bottom surface of the turbine, a rotating hole is opened in the movable seat, the rotating hole is adapted to the rotating cylinder, the rotating cylinder is rotatably connected to the rotating hole, a limiting ring is coaxially fixedly connected to the bottom of the peripheral side wall of the rotating cylinder, a fixing groove is opened on the inner side wall of the rotating hole corresponding to the limiting ring, and the limiting ring is rotatably connected to the fixing groove.

[0033] By adopting the above technical solution, when the turbine rotates, it drives the rotating cylinder to rotate, and the rotating cylinder drives the limiting ring to rotate in the fixed groove, thereby limiting the rotation of the turbine and improving the stability of the turbine rotation.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. First, set up multiple temporary support piers along the towing direction, set up a towing winch on the temporary support pier at the front end of the towing direction, and install a set of propulsion devices on the remaining temporary support piers; then hoist the guide beam and steel truss beam onto the temporary support pier, and complete the assembly of the beam body; use the propulsion device to first lift the beam body, then push the beam body along the towing direction, and at the same time, use the towing winch to tow the beam body. After the towing is completed, the beam body falls back; after completing a towing process, assemble the steel truss beam to lengthen the beam body, and repeat the towing process until the assembly and towing of the entire span steel truss beam are completed; install formal bearings on the bridge piers, and move the temporary support piers and towing winches. The propulsion device is removed, and the beam body is dropped onto the formal support, thereby completing the dragging construction of the beam body; compared with only using a dragging winch to drag the beam body, an additional propulsion device is added to drag the beam body while pushing the beam body in the dragging direction, which greatly shares the force of the steel wire rope when the dragging winch is dragging, thereby making it easier for the dragging winch to drag the beam body and reducing the impact on the service life of the dragging winch; at the same time, the method of assembling steel trusses in sections is adopted. Compared with dragging the entire steel truss beam, the weight of the beam body is greatly reduced, and at the same time, the force of the steel wire rope when the dragging winch is dragging is reduced, and the impact on the service life of the dragging winch is also reduced;

[0036] 2. Start the lifting hydraulic cylinder, which drives the support box to rise, which drives the propulsion plate to rise, and the propulsion plate drives the beam to rise; start the traction winch and the propulsion hydraulic cylinder, the traction winch drags the beam in the traction direction, and at the same time the propulsion hydraulic cylinder pushes the propulsion plate to slide in the traction direction, and the propulsion plate drives the beam to slide in the traction direction, thereby completing the traction of the beam. In the process of the traction winch traction of the beam, the beam is pushed at the same time, thereby reducing the force on the wire rope of the traction winch and reducing the impact on the service life of the traction winch;

[0037] 3. When the camber of the steel truss changes, the lifting elevation of the jacking hydraulic cylinder changes. At this time, the height adjustment component is used to lift the support box. When it is lifted to the elevation, the pad assembly slides out of the height adjustment component and slides under the jacking hydraulic cylinder to support the jacking hydraulic cylinder, thereby completing the adjustment of the lifting elevation of the jacking hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present application;

[0039] Figure 2 It is a partial structural schematic diagram of an embodiment of the present application, mainly used to show the propulsion device;

[0040] Figure 3It is a partial structural cross-sectional view of the embodiment of the present application, mainly used to show the height adjustment component and the pad assembly;

[0041] Figure 4 It is a partial structural schematic diagram of an embodiment of the present application, mainly used to show the buffer;

[0042] Figure 5 It is a partial structural plan cross-sectional view of an embodiment of the present application, mainly used to show the buffer;

[0043] Figure 6 It is a partial structural cross-sectional view of an embodiment of the present application, mainly used to show the pad assembly;

[0044] Figure 7 It is a partial structural diagram of an embodiment of the present application, mainly used to display the lifting assembly, the propulsion assembly and the deviation correction assembly.

[0045] Description of reference numerals: 1. temporary support pier; 11. pile foundation; 12. steel pipe column; 13. top plate; 14. reinforcement plate; 2. propulsion device; 21. height adjustment assembly; 211. support seat; 2111. mounting groove; 2112. receiving groove; 2113. guide groove; 212. height adjustment hydraulic cylinder; 213. support plate; 214. guide frame; 215. buffer; 2151. guide plate; 2152. buffer block; 2153. shock absorbing spring; 2154. first buffer strip; 2155. second buffer strip; 2156. slideway; 2157. buffer rod; 2158. limit block; 2159. limit groove; 2160. limit plate; 22. pad assembly; 221. moving seat; 2211. rotating hole; 2212. fixing groove; 222. push spring; 223 , guide rod; 224, rack; 225, worm; 226, driving gear; 227, rotating cylinder; 228, limiting ring; 229, turbine; 230, screw; 231, bearing plate; 232, electric cylinder; 233, pressure sensor; 24, lifting assembly; 241, lifting hydraulic cylinder; 242, buffer base; 25, support box; 26, propulsion assembly; 261, fixed seat; 262, propulsion hydraulic cylinder; 263, sliding plate; 2631, first sliding plate; 2632, second sliding plate; 264, first limiting rod; 265, first sliding layer; 266, second sliding layer; 27, deviation correction assembly; 271, support block; 272, propulsion plate; 273, deviation correction hydraulic cylinder; 274, second limiting rod; 3, beam body; 4, traction winch; 5, pulley. DETAILED DESCRIPTION

[0046] The following is combined with Figure 1-7 This application is described in further detail.

[0047] Example 1

[0048] Example 1 of the present application discloses a single-span steel truss dragging construction process.

[0049] The single-span steel truss girder dragging construction process includes the following steps:

[0050] S1, temporary support pier 1 construction: refer to Figure 1 , multiple temporary support piers 1 are arranged along the towing direction, and the multiple temporary support piers 1 are arranged at equal intervals. The temporary support pier 1 includes a pile foundation 11, a steel pipe column 12 and a top plate 13. The pile foundation 11 is set on the ground and is made of reinforced concrete. There are four steel pipe columns 12, and the four steel pipe columns 12 are all vertically arranged and the bottom ends are fixedly connected to the pile foundation 11. The four steel pipe columns 12 are evenly distributed along the circumference of the pile foundation 11. Multiple reinforcement plates 14 are fixedly connected between the four steel pipe columns 12. The multiple reinforcement plates 14 are arranged at equal intervals along the axial direction of the steel pipe columns 12, and the reinforcement plates 14 are arranged horizontally. The top plate 13 is fixedly connected to the top of the four steel pipe columns 12, and the top plate 13 is arranged horizontally.

[0051] S2, installation of winch set and propulsion device 2: After the construction of temporary support pier 1 is completed, a winch set is installed on the top surface of temporary support pier 1 at the front end along the towing direction. The winch set includes two towing winches 4. The two towing winches 4 are arranged in a direction perpendicular to the towing direction. The length direction of the steel wire ropes of the two towing winches 4 is parallel to the towing direction. A set of propulsion devices 2 are installed on the top surfaces of the remaining temporary support piers. The propulsion device 2 is located between the steel wire ropes of the two towing winches 4.

[0052] S3, assembling guide beams and steel trusses: using a crawler crane to hoist the guide beam and a steel truss above the temporary support pier 1, assembling the guide beam and the steel truss to form a beam body 3, the guide beam is located at the front end of the beam body 3 along the pulling direction.

[0053] S4, drag beam 3: refer to Figure 1 The bottom surface of the guide beam is connected with two sets of pulleys 5 through high-strength bolts. The two sets of pulleys 5 are respectively set corresponding to the two traction winches 4. The other ends of the wire ropes of the two traction winches 4 are respectively wound on the two sets of pulleys 5. Start the propulsion device 2, lift the beam body 3, start the winch group, the winch group drags the beam body 3, and the propulsion device 2 pushes the beam body 3 in the dragging direction. Each time the beam body is dragged for a specified distance, after the dragging is completed, the propulsion device 2 drives the beam body 3 back to its original position.

[0054] S5, assembling steel trusses: After completing a dragging process, a crawler crane is used to continue assembling steel trusses at the rear end of the assembled steel trusses to lengthen the beam body 3. After the assembly is completed, the operation of step S4 is repeated until the assembly and dragging of the entire beam body 3 are completed.

[0055] S6, installing formal bearings: installing formal bearings on the bridge piers, the formal bearings are used to support the beam body 3. The temporary supporting piers 1, the traction winch 4, the propulsion device 2 and the guide beam are removed, and the beam body 3 is dropped onto the formal bearings, thereby completing the traction construction of the beam body 3.

[0056] The implementation principle of the single-span steel truss girder dragging construction process of the embodiment of the present application is as follows: first, multiple temporary support piers 1 are set along the dragging direction, a dragging winch 4 is installed on the temporary support pier 1 at the front end along the dragging direction, and a set of propulsion devices 2 are installed on the remaining temporary support piers 1. A crawler crane is used to hoist the guide beam and a steel truss girder above the temporary support pier 1, and assembled to form a beam body 3. The propulsion device 2 is used to first lift the beam body 3, and the winch group is used to drag the beam body 3. At the same time, the propulsion device 2 pushes the beam body 3 along the dragging direction. After one dragging process is completed, the beam body 3 falls back to its original position. After completing one dragging process, the crawler crane is used to continue to assemble the steel truss girder to lengthen the beam body 3, and the dragging process is repeated until the assembly and dragging of the entire beam body 3 are completed. A formal support is installed on the bridge pier, and the temporary support pier 1, the dragging winch 4, the propulsion device 2 and the guide beam are removed, and the beam body 3 falls onto the formal support, thereby completing the dragging construction of the beam body 3.

[0057] Example 2

[0058] Based on embodiment 1, this embodiment further proposes a propulsion device 2.

[0059] Reference Figure 1 and Figure 2 The propulsion device 2 includes a lifting assembly 24 and a propulsion assembly 26. The lifting assembly 24 is arranged on the top surface of the temporary support pier 1 and below the beam body 3. The lifting assembly 24 is used to vertically lift the beam body 3. A support box 25 is arranged on the lifting assembly 24. The propulsion assembly 26 is slidably connected to the top surface of the support box 25 along the dragging direction. The propulsion assembly 26 is used to propel the beam body 3 along the dragging direction. A deviation correction assembly 27 is arranged on the propulsion assembly 26. The deviation correction assembly 27 is used to push the beam body 3 in a direction perpendicular to the dragging direction of the beam body 3 to correct the dragging direction of the beam body 3. In order to adapt to the preset camber of the steel truss, an elevation adjustment mechanism is also arranged on the top surface of the temporary support pier 1. The elevation adjustment mechanism is located below the lifting assembly 24 to adjust the elevation of the beam body 3 lifted by the lifting assembly 24.

[0060] Reference Figure 1 and Figure 2The elevation adjustment mechanism includes an elevation adjustment component 21 and two sets of pad assemblies 22. The elevation adjustment component 21 is arranged on the top surface of the temporary support pier 1 and below the support box 25. The elevation adjustment component 21 is used to lift the support box 25. The two sets of pad assemblies 22 are both located in the elevation adjustment component 21 and at both ends of the elevation adjustment component 21. When the bottom surface height of the lifting component 24 reaches the adjustment elevation, the two sets of pad assemblies 22 slide out of the elevation adjustment component 21 in the direction away from each other, and support the lifting component 24 after sliding out.

[0061] Reference Figure 1 , Figure 2 and Figure 3 The height adjustment component 21 includes a support seat 211, which is fixedly connected to the top surface of the temporary support pier 1, and the length direction of the support seat 211 is parallel to the length direction of the beam body 3. The top surface of the support seat 211 is provided with a mounting groove 2111, and a height adjustment hydraulic cylinder 212 is fixedly connected in the mounting groove 2111. The height adjustment hydraulic cylinder 212 is axially arranged vertically, and a support plate 213 is fixedly connected to the top of the piston rod of the height adjustment hydraulic cylinder 212. The support plate 213 is arranged horizontally. When the height adjustment hydraulic cylinder 212 lifts the support box 25, the top surface of the support plate 213 abuts against the bottom surface of the support box 25. In order to make the lifting process of the support box 25 by the height adjustment hydraulic cylinder 212 more stable, a guide frame 214 is fixedly connected to the bottom surface of the support box 25. When the support plate 213 slides vertically, it abuts against the inner wall of the guide frame 214, thereby guiding the sliding of the support plate 213 and improving the sliding stability of the support plate 213.

[0062] When the elevation of the jacking assembly 24 needs to be adjusted, the height adjustment hydraulic cylinder 212 is started, and the piston rod of the height adjustment hydraulic cylinder 212 drives the support plate 213 to rise. When the support plate 213 rises to abut against the bottom surface of the support box 25, the height adjustment hydraulic cylinder 212 pushes the support box 25 to rise, and the support box 25 drives the jacking assembly 24 to rise. At this time, the pad assembly 22 slides to the bottom of the jacking assembly 24 to support the jacking assembly 24.

[0063] Reference Figure 2 and Figure 3 When the lifting assembly 24 is supported, the piston rod of the height-adjusting hydraulic cylinder 212 falls back. In order to reduce the impact force on the temporary support pier 1 when the piston rod of the height-adjusting hydraulic cylinder 212 falls back, two groups of buffers 215 are provided on the top surface of the support seat 211. The two groups of buffers 215 are used to slow down the speed of the jack piston rod when it falls back, thereby reducing the impact force on the support seat 211 when the piston rod of the height-adjusting hydraulic cylinder 212 falls back. The two groups of buffers 215 are arranged along the length direction of the support seat 211, and the height-adjusting hydraulic cylinder 212 is located between the two groups of buffers 215.

[0064] Reference Figure 4The buffer member 215 includes two guide plates 2151, which are arranged along the length direction of the support seat 211. The two guide plates 2151 are both configured as arc-shaped plates and are axially arranged vertically, and the concave surfaces of the two guide plates 2151 are arranged opposite to each other. A buffer block 2152 is vertically slidably connected between the two guide plates 2151. The length direction of the buffer block 2152 is parallel to the length direction of the guide plate 2151. A shock absorbing spring 2153 is fixedly connected to the bottom surface of the buffer block 2152, and the bottom end of the shock absorbing spring 2153 is fixedly connected to the top surface of the support seat 211. Multiple first buffer strips 2154 are fixedly connected to the side of the two guide plates 2151 facing the buffer block 2152. The multiple first buffer strips 2154 are arranged at equal intervals along the length direction of the guide plates 2151. The length direction of the first buffer strips 2154 is parallel to the circumference of the guide plates 2151, and the first buffer strips 2154 are configured as silicone strips. A group of second buffer bars 2155 are fixedly connected to both sides of the buffer block 2152 facing the two guide plates 2151, each group of second buffer bars 2155 is arranged corresponding to each group of first buffer bars 2154, each group of second buffer bars 2155 includes multiple second buffer bars 2155, and the multiple second buffer bars 2155 are arranged at equal intervals along the length direction of the buffer block 2152. The length direction of the second buffer bars 2155 is parallel to the circumference of the buffer block 2152, and the second buffer bars 2155 are set as silicone bars.

[0065] When the buffer block 2152 slides between the two guide plates 2151, the first buffer strip 2154 abuts against the second buffer strip 2155. Since the first buffer strip 2154 and the second buffer strip 2155 are both silicone strips, during the sliding process, the first buffer strip 2154 and the second buffer strip 2155 continuously rub against each other, so that the sliding speed of the buffer block 2152 is slowed down, thereby playing a buffering role when the piston rod of the hydraulic cylinder 212 falls back.

[0066] Reference Figure 3 and Figure 5A slide groove 2156 is vertically provided in the buffer block 2152, and a buffer rod 2157 is slidably connected in the slide groove 2156. The buffer rod 2157 is axially arranged vertically, and the top of the buffer rod 2157 is fixedly connected to the bottom surface of the support plate 213. Two limit blocks 2158 are fixedly connected to the bottom end of the side wall of the buffer rod 2157, and the two limit blocks 2158 are arranged radially along the buffer rod 2157. Two limit grooves 2159 are vertically provided on the inner wall of the slide groove 2156. The two limit grooves 2159 are arranged one-to-one with the two limit blocks 2158, and the top of the limit groove 2159 is not opened. The two limit blocks 2158 are slidably connected to the corresponding limit grooves 2159. Two receiving grooves 2112 are vertically formed on the top surface of the support seat 211. The two receiving grooves 2112 are respectively located below the two shock absorbing springs 2153. The lower ends of the two buffer rods 2157 are respectively slidably connected in the two receiving grooves 2112. The top of the buffer rod 2157 is coaxially fixedly connected with a limit plate 2160. The limit plate 2160 is made of silicone. When the buffer rod 2157 slides down to the limit plate 2160 and abuts against the top surface of the buffer block 2152, the limit plate 2160 can reduce the impact of the buffer rod 2157 on the buffer block 2152 and push the buffer block 2152 to slide down.

[0067] When the piston rod of the height adjustment hydraulic cylinder 212 falls back, the support plate 213 is driven down, and the support plate 213 drives the buffer rod 2157 to slide down vertically in the slide groove 2156. When the buffer rod 2157 slides to the limit plate 2160 and abuts against the top surface of the buffer block 2152, the limit plate 2160 pushes the buffer block 2152 to slide down, and the second buffer strip 2155 on the buffer block 2152 rubs against the first buffer strip 2154 on the guide plate 2151. At the same time, the buffer block 2152 compresses the shock-absorbing spring 2153, thereby slowing down the sliding speed of the buffer block 2152 and buffering the falling of the piston rod of the height adjustment hydraulic cylinder 212.

[0068] Reference Figure 2 and Figure 3 The pad assembly 22 includes a moving seat 221. Both ends of the support seat 211 are provided with guide grooves 2113. The guide grooves 2113 are provided along the length direction of the support seat 211. The two moving seats 221 are respectively slidably connected in the two guide grooves 2113. The length direction of the moving seat 221 is perpendicular to the length direction of the support seat 211. Two push springs 222 are fixedly connected between the moving seat 221 and the inner bottom wall of the adjacent guide groove 2113. The two push springs 222 are arranged along the length direction of the moving seat 221. When the moving seat 221 is located in the corresponding guide groove 2113, the two push springs 222 are in a compressed state; when the jacking assembly 24 rises with the support box 25, the push springs 222 push the moving seat 221 out of the guide groove 2113, and the two moving seats 221 are pushed away from each other.

[0069] Reference Figure 3 In order to improve the sliding stability of the moving seat 221, two groups of guide rods 223 are fixedly connected to the upper surface of the temporary support pier 1. The two groups of guide rods 223 are respectively located at both ends of the support seat 211. Each group of guide rods 223 includes two guide rods 223, and the two guide rods 223 are arranged in a direction perpendicular to the length direction of the support seat 211. The two groups of guide rods 223 are respectively located in two guide grooves 2113. The length direction of the guide rods 223 is parallel to the length direction of the support seat 211. Each moving seat 221 is slidably connected between the corresponding two guide rods 223.

[0070] When the hydraulic cylinder 212 is adjusted to lift the support box 25, the support box 25 drives the lifting assembly 24 to lift. When the height of the lifting assembly 24 is lifted to a point where its bottom surface is higher than the top surface of the moving seat 221, the moving seat 221 is pushed out of the guide groove 2113 by the push spring 222. When the moving seat 221 slides to abut against the baffle, the moving seat 221 is located below the lifting assembly 24.

[0071] Reference Figure 6 , the top surface of one of the guide rods 223 in the two groups of guide rods 223 is fixedly connected with a rack 224, and the length direction of the rack 224 is parallel to the length direction of the guide rod 223. A worm 225 is rotatably connected in the moving seat 221, and the worm 225 is located on the side of the moving seat 221 away from the other moving seat 221. The axial direction of the worm 225 is parallel to the length direction of the moving seat 221, and one end of the worm 225 close to the adjacent rack 224 extends out of the moving seat 221. One end of the worm 225 extending out of the moving seat 221 is coaxially fixedly connected with a driving gear 226, and the driving gear 226 is meshed with the adjacent rack 224. When the push spring 222 pushes the moving seat 221 to slide, the driving gear 226 is driven to rotate. A rotating hole 2211 is vertically opened in the moving seat 221, and the lower end of the rotating hole 2211 is not opened. A rotating cylinder 227 is arranged in the moving seat 221, and the rotating cylinder 227 is coaxially rotatably connected in the rotating hole 2211. In order to make the rotating cylinder 227 rotate more stably, a fixing groove 2212 is coaxially opened at the bottom of the inner side wall of the rotating hole 2211, and a limiting ring 228 is coaxially fixedly connected to the bottom end of the peripheral side wall of the rotating cylinder 227, and the limiting ring 228 is rotatably connected in the fixing groove 2212. A turbine 229 is coaxially fixedly connected to the top of the rotating cylinder 227, and the turbine 229 is meshed with the worm 225. A screw 230 is connected to the inner thread of the turbine 229, and the screw 230 is coaxially arranged with the turbine 229. The top of the screw 230 extends out of the moving seat 221, and the top of the screw 230 is fixedly connected to a bearing plate 231, and the length direction of the bearing plate 231 is parallel to the length direction of the moving seat 221.

[0072] During the sliding process of the movable seat 221, since the driving gear 226 is meshed with the rack 224, the driving gear 226 rotates, and the driving gear 226 drives the worm to rotate, and the worm 225 drives the turbine 229 to rotate, and the turbine 229 drives the screw 230 to slide upward, and the screw 230 drives the bearing plate 231 to slide upward until it abuts against the bottom surface of the jacking assembly 24, thereby supporting the jacking assembly 24.

[0073] Reference Figure 2 and Figure 6 In order to improve the supporting force of the bearing plate 231, four electric cylinders 232 are fixedly connected in the moving seat 221. The four electric cylinders 232 are evenly distributed at the four corners of the moving seat 221. The electric cylinders 232 are axially arranged vertically, and the top of the piston rod of the electric cylinder 232 abuts against the bottom surface of the bearing plate 231. A pressure sensor 233 is installed on the top surface of the bearing plate 231, and the pressure sensor 233 is used to control the opening and closing of the electric cylinder 232. When the bearing plate 231 rises to abut against the bottom surface of the jacking assembly 24, the piston rod of the electric cylinder 232 extends to press the bearing plate 231 against the bottom surface of the jacking assembly 24. At this time, the pressure sensor 233 controls the electric cylinder 232 to close, and the electric cylinder 232 supports the bearing plate 231, and the bearing plate 231 supports the jacking assembly 24.

[0074] Reference Figure 2 and Figure 7 , the length direction of the support box 25 is parallel to the length direction of the support seat 211, and is located directly above the support seat 211. The lifting assembly 24 includes four lifting hydraulic cylinders 241, the cylinder bodies of the four lifting hydraulic cylinders 241 are fixedly connected to the support box 25, and are respectively arranged at the four corners of the bottom surface of the support box 25, the four lifting hydraulic cylinders 241 are axially arranged vertically, the free ends of the piston rods of the four lifting hydraulic cylinders 241 are abutted against the top surface of the temporary support pier 1, and the support seat 211 is located between the four lifting hydraulic cylinders 241. When the piston rod of the lifting hydraulic cylinder 241 is extended, the piston rod of the lifting hydraulic cylinder 241 applies a reaction force to the cylinder body of the lifting hydraulic cylinder 241, so that the support box 25 is lifted. In order to buffer and protect the free ends of the piston rods of the lifting hydraulic cylinders 241, the free ends of the piston rods of the four lifting hydraulic cylinders 241 are fixedly connected with a buffer base 242, and the buffer base 242 is set to a silicone material.

[0075] The hydraulic cylinder 212 is raised to lift the support box 25, so that the lifting hydraulic cylinder 241 is separated from the top surface of the temporary support pier 1. At this time, the lifting hydraulic cylinder 241 is retracted. When the lifting hydraulic cylinder 241 is retracted until the moving seat 221 slides out of the guide groove 2113, the moving seat 221 gradually slides to the bottom of two adjacent lifting hydraulic cylinders 241. In addition, during the sliding process of the moving seat 221, the bearing plate 231 is gradually raised. After the elevation adjustment of the bottom surface of the lifting hydraulic cylinder 241 is completed, the lifting hydraulic cylinder 241 stops rising. After the bearing plate 231 slides to abut against the bottom surface of the lifting hydraulic cylinder 241, the piston rod of the electric cylinder 232 presses the bearing plate 231 and the bottom surface of the lifting hydraulic cylinder 241 tightly, so that the moving seat 221 stops sliding and supports the lifting hydraulic cylinder 241.

[0076] Reference Figure 7 The propulsion assembly 26 includes a fixed seat 261, which is fixedly connected to one end of the length direction of the support box 25, and the length direction of the fixed seat 261 is perpendicular to the length direction of the support box 25. A plurality of propulsion hydraulic cylinders 262 are fixedly connected in the fixed seat 261, and in this embodiment, three propulsion hydraulic cylinders 262 are arranged equidistantly along the length direction of the fixed seat 261, and the axes of the three propulsion hydraulic cylinders 262 are parallel to the length direction of the support box 25, and the piston rods of the propulsion hydraulic cylinders 262 are extended toward the other end of the support box 25. The top surface of the support box 25 is slidably connected with a sliding plate 263 along the length direction of the support box 25, and the sliding plate 263 includes a first sliding plate 2631 and a second sliding plate 2632. The first sliding plate 2631 is horizontally arranged and its length direction is parallel to the length direction of the support box 25, and the second sliding plate 2632 is vertically arranged and fixedly connected to one end of the first sliding plate 2631 close to the fixed seat 261, and the second sliding plate 2632 is fixedly connected to the free ends of the piston rods of the three thrust hydraulic cylinders 262 toward the side of the fixed seat 261.

[0077] After the height adjustment of the beam body 3 is completed, the lifting hydraulic cylinder 241 is started, the lifting hydraulic cylinder 241 drives the support box 25 to rise, the support box 25 drives the sliding plate 263 to rise, the sliding plate 263 drives the correction component 27 to rise, and the correction component 27 drives the beam body 3 to rise, thereby completing the lifting of the beam body 3. At this time, the traction winch 4 is started, the traction winch 4 drags the beam body, and the propulsion hydraulic cylinder 262 is started at the same time, the propulsion hydraulic cylinder 262 pushes the sliding plate 263 to slide along the dragging direction of the beam body 3, the sliding plate 263 drives the correction component 27 to slide along the dragging direction of the beam body 3, and the correction component 27 drives the beam body 3 to slide along the dragging direction of the beam body 3, thereby completing the dragging of the beam body 3.

[0078] Reference Figure 7In order to improve the sliding stability of the sliding plate 263, two first limit rods 264 are fixedly connected to the top surface of the support box 25. The length direction of the first limit rods 264 is parallel to the length direction of the support box 25. The two first limit rods 264 are arranged along the width direction of the support box 25, and the sliding plate 263 is slidably connected between the two first limit rods 264. In order to facilitate the pushing of the sliding plate 263, a first sliding layer 265 is fixedly connected to the top surface of the support box 25. The material of the first sliding layer 265 is set to mirror stainless steel. The first sliding layer 265 is located between the two first limit rods 264. The bottom surface of the first sliding plate 2631 is fixedly connected to the second sliding layer 266. The material of the second sliding layer 266 is set to a polytetrafluoroethylene plate, thereby reducing the friction between the first sliding plate 2631 and the top surface of the support box 25, making it easier to push the sliding plate 263 to slide.

[0079] Reference Figure 2 and Figure 7 The deviation-correcting assembly 27 includes a support block 271, which is slidably connected to the top surface of the first sliding plate 2631 in a direction perpendicular to the length direction of the first sliding plate 2631, and the length direction of the support block 271 is parallel to the length direction of the first sliding plate 2631. A push plate 272 is fixedly connected to the top surface of the support block 271, and when the beam body 3 is pushed, the push plate 272 abuts against the bottom surface of the beam body 3. Two groups of correcting hydraulic cylinders 273 are fixedly connected to the top surface of the first sliding plate 2631, and the two groups of correcting hydraulic cylinders 273 are respectively located on both sides of the length direction of the support block 271, and each group of correcting hydraulic cylinders 273 includes two correcting hydraulic cylinders 273. The two correcting hydraulic cylinders 273 in each group are arranged along the length direction of the support block 271, and the axial direction of the correcting hydraulic cylinders 273 is perpendicular to the length direction of the support block 271. The piston rods of the two groups of correcting hydraulic cylinders 273 are both located on the side close to the support block 271, and the two groups of correcting hydraulic cylinders 273 are used to push the support block 271 to slide in a direction perpendicular to the length direction of the support block 271. In order to make the sliding of the support block 271 more stable, two second limiting rods 274 are fixedly connected to the top surface of the first sliding plate 2631. The two second limiting rods 274 are arranged along the length direction of the first sliding plate 2631. The length direction of the second limiting rods 274 is perpendicular to the length direction of the first sliding plate 2631. The support block 271 is slidably connected between the two second limiting rods 274.

[0080] The propulsion hydraulic cylinder 262 pushes the sliding plate to slide, the sliding plate drives the propulsion plate 272 to slide, and the propulsion plate 272 drives the beam body 3 to slide, thereby completing the propulsion of the beam body 3. When the beam body 3 deviates in a direction perpendicular to its length direction during the propulsion process, the deviation correction hydraulic cylinder 273 is started, and the deviation correction hydraulic cylinder 273 propels the beam body 3 in a direction perpendicular to the length direction of the beam body 3, so that the beam body 3 is reset, and the deviation correction of the beam body 3 is completed.

[0081] The implementation principle of the embodiment of the present application is: when the elevation of the lifting hydraulic cylinder 241 needs to be adjusted, the height adjustment hydraulic cylinder 212 is started, and the height adjustment hydraulic cylinder 212 drives the support plate 213 to rise. When the support plate 213 rises to abut against the bottom surface of the support box 25, the height adjustment hydraulic cylinder 212 pushes the support box 25 to rise, and the support box 25 drives the lifting hydraulic cylinder 241 to rise.

[0082] The lifting hydraulic cylinder 241 is separated from the top surface of the temporary support pier 1. At this time, the lifting hydraulic cylinder 241 is retracted, and the push spring 222 pushes the moving seat 221 to slide out of the guide groove 2113, and the moving seat 221 gradually slides to the bottom of two adjacent lifting hydraulic cylinders 241. During the sliding process of the moving seat 221, due to the meshing of the driving gear 226 and the rack 224, the driving gear 226 rotates, the driving gear 226 drives the worm to rotate, the worm 225 drives the turbine 229 to rotate, the turbine 229 drives the screw 230 to slide upward, and the screw 230 drives the bearing plate 231 to slide upward. When the elevation adjustment of the lifting hydraulic cylinder 241 is completed, the lifting hydraulic cylinder 241 stops rising, and after the bearing plate 231 slides to abut against the bottom surface of the lifting hydraulic cylinder 241, the piston rod of the electric cylinder 232 presses the bearing plate 231 and the bottom surface of the lifting hydraulic cylinder 241 tightly, so that the moving seat 221 stops sliding and supports the lifting hydraulic cylinder 241.

[0083] After the elevation adjustment of the lifting hydraulic cylinder 241 is completed, the lifting hydraulic cylinder 241 is started, the lifting hydraulic cylinder 241 drives the support box 25 to rise, the support box 25 drives the sliding plate 263 to rise, the sliding plate 263 drives the push plate 272 to rise, and the push plate 272 drives the beam body 3 to rise, thereby completing the lifting of the beam body 3. At this time, the traction winch 4 is started, the traction winch 4 drags the beam body 3, and the push hydraulic cylinder 262 is started at the same time, the push hydraulic cylinder 262 pushes the sliding plate 263 to slide along the dragging direction of the beam body 3, the sliding plate 263 drives the push plate 272 to slide along the dragging direction of the beam body 3, and the push plate 272 drives the beam body 3 to slide along the dragging direction of the beam body 3, thereby completing the dragging of the beam body 3. When the beam body 3 deviates in the direction perpendicular to its length direction during the dragging process, the deviation correction hydraulic cylinder 273 is started, and the deviation correction hydraulic cylinder 273 pushes the beam body 3 in the direction perpendicular to the length direction of the beam body 3, so that the beam body 3 is reset, and the deviation correction of the beam body 3 is completed.

[0084] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. Single-span steel truss girder dragging construction process, characterized by: The steps include: S1, constructing multiple temporary support piers (1), installing a towing winch (4) and multiple sets of propulsion devices (2), wherein the towing winch is located on the temporary support pier (1) at the front end along the towing direction, and the multiple sets of propulsion devices (2) are respectively located on the remaining multiple temporary support piers (1); S2, hoisting the guide beam and a steel truss beam onto the temporary support pier (1) and completing the assembly, wherein the guide beam is located at the front end of the steel truss beam along the pulling direction to form a beam body (3); S3, using the traction winch (4) to drag the beam (3), and simultaneously using the propulsion device (2) to propel the beam (3); S4, continue to assemble the steel truss at the rear end of the steel truss in the pulling direction to lengthen the beam body (3), and repeat S3 until the assembly of the steel truss in all holes is completed; S5, installing the formal support, removing the temporary support pier (1), the traction winch (4) and the propulsion device (2), and dropping the beam body (3) onto the formal support; Based on S1, the propulsion device (2) comprises a lifting assembly (24) and a propulsion assembly (26), the lifting assembly (24) is located on the top surface of the temporary support pier (1), the propulsion assembly (26) is slidably connected to the lifting assembly (24) along the towing direction, the lifting assembly (24) is used to lift the beam body (3), and the propulsion assembly (26) is used to propel the beam body (3) along the towing direction; The jacking assembly (24) comprises a jacking hydraulic cylinder (241), the jacking hydraulic cylinder (241) is arranged on the top surface of the temporary support pier (1), a support box (25) is arranged on the jacking hydraulic cylinder (241), the propulsion assembly (26) comprises a propulsion hydraulic cylinder (262), the propulsion hydraulic cylinder (262) is arranged on the support box (25), a propulsion plate (272) is slidably connected to the support box (25) along the dragging direction of the beam body (3), the propulsion plate (272) is in contact with the bottom surface of the beam body (3), and the propulsion hydraulic cylinder (262) is used to push the propulsion plate (272) to slide; The propulsion device (2) further comprises a height adjustment component (21) and a cushion lifting component (22); the height adjustment component (21) is located below the support box (25); the height adjustment component (21) is used to adjust the elevation of the lifting hydraulic cylinder (241); the cushion lifting component (22) is slidably connected inside the height adjustment component (21); when the cushion lifting component (22) slides to below the lifting hydraulic cylinder (241), the cushion lifting component (22) is used to support the lifting hydraulic cylinder (241); The height adjustment component (21) comprises a support seat (211), the support seat (211) is located on the top surface of the temporary support pier (1) and below the support box (25), and a height adjustment hydraulic cylinder (212) is arranged in the support seat (211), and the height adjustment hydraulic cylinder (212) is used to lift the support box (25); The pad assembly (22) comprises a movable seat (221), a guide groove (2113) is provided in the support seat (211), a push spring (222) is fixedly connected in the guide groove (2113), and when the movable seat (221) is located in the guide groove (2113), the push spring (222) is in a compressed state; The pad assembly (22) further comprises an electric cylinder (232), a bearing plate (231) and two guide rods (223); the electric cylinder (232) is arranged in the movable seat (221); the electric cylinder (232) is axially arranged vertically; the bearing plate (231) is arranged at the top end of the piston rod of the electric cylinder (232); and the bearing plate (231) is located below the lifting hydraulic cylinder (241); A screw rod (230) is slidably connected inside the movable seat (221); the movable seat (221) is axially arranged vertically; the screw rod (230) is threadedly connected to the movable seat (221); the top end of the screw rod (230) extends out of the movable seat (221) and is fixedly connected to the bottom surface of the bearing plate (231); A turbine (229) is rotatably connected inside the movable seat (221), the screw (230) is coaxially arranged with the turbine (229) and threadedly connected, a worm (225) is rotatably connected inside the movable seat (221), the axial direction of the worm (225) is perpendicular to the axial direction of the screw (230), one end of the worm (225) extends out of the movable seat (221) and is coaxially fixedly connected with a driving gear (226), one of the guide rods (223) is provided with a rack (224), and the driving gear (226) is meshed with the rack (224); The bottom surface of the turbine (229) is coaxially fixedly connected with a rotating cylinder (227); a rotating hole (2211) is provided in the movable seat (221); the rotating hole (2211) is adapted to the rotating cylinder (227); the rotating cylinder (227) is rotatably connected in the rotating hole (2211); a limiting ring (228) is coaxially fixedly connected to the bottom of the peripheral side wall of the rotating cylinder (227); a fixing groove (2212) is provided on the inner side wall of the rotating hole (2211) corresponding to the limiting ring (228); and the limiting ring (228) is rotatably connected in the fixing groove (2212).

2. The single-span steel truss girder dragging construction process according to claim 1 is characterized in that: The two guide rods (223) are both fixedly connected to the top surface of the temporary support pier (1); the length direction of the guide rods (223) is parallel to the direction in which the guide grooves (2113) are opened; the guide rods (223) are located below the lifting hydraulic cylinder (241); and the moving seat (221) is slidably connected between the two guide rods (223).

3. The single-span steel truss girder dragging construction process according to claim 1 is characterized in that: A pressure sensor (233) is installed on the top surface of the bearing plate (231), and the pressure sensor (233) is used to control the opening and closing of the electric cylinder (232).

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