Bottom mould transportation construction device and method for high-speed railway box girder prefabrication production line

Abstract

The application discloses a bottom mould transportation construction device and method for a high-speed railway box girder prefabrication production line. The device comprises a bottom mould transportation track, a jack walking track arranged on one side and / or both sides of the bottom mould transportation track, a track clamping mechanism which is clamped with the jack walking track, a walking pushing jack used for pushing the bottom mould to move forward, a jack walking vehicle which can drive the pushing jack to move along the walking jack walking track, and a track foundation used for supporting the bottom mould transportation track. The method comprises the following steps: the piston rod of the walking pushing jack is retracted and extended to realize the movement of the bottom mould carrying the box girder between stations. The station transfer of the bottom mould carrying the box girder can be completed without using large lifting tools, the probability of deformation in the box girder transfer engineering can be reduced, and the station transfer efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high-speed railway box girder prefabrication technology, and particularly relates to a bottom mold transportation construction device and method for a high-speed railway box girder prefabrication production line. BACKGROUND

[0002] Traditional high-speed railway box girders are prefabricated by using a fixed platform, and the processes from entering a mold with a reinforcement cage, assembling a mold, pouring, to initial tensioning are all completed on one platform. The traditional prefabrication method is mature, but has the following obvious defects: (1) high construction cost: in order to ensure the construction progress, if several box girders are to be prefabricated at the same time, a large number of fixed platforms and mold systems need to be invested, and a large number of personnel need to be invested, which increases the construction cost; (2) concentrated processes, and large mutual interference between mechanical devices: according to the sequence of processes, the mechanical devices need to be continuously adjusted to enter and exit, and the mechanical devices need to be transferred between different stations, which increases the difficulty of construction management; (3) low production efficiency: the concrete steam curing technology has become mature, and the traditional fixed platform pouring mode is difficult to achieve closed space steam curing, the steam curing efficiency is low, the concrete strength time is long, and generally, one platform produces one girder in 5-6 days, and the prefabrication efficiency is low; and (4) high pouring cost: multiple platforms are poured at the same time, and concrete tank trucks are used to transport concrete from a mixing station to a pouring site, which is low in efficiency, large in oil consumption, and high in cost.

[0003] At present, the high-speed railway box girder prefabrication production line with multiple stations has become a research hotspot, and the specific processes of prefabricated box girders mainly include: side mold assembly, polishing, and brushing of a release agent → installation of a support plate and anti-falling beam embedded parts → entering a mold with a reinforcement cage → installation of an inner mold → installation of an end mold → installation of embedded parts such as ventilation holes, drainage holes, and lifting holes → pouring of concrete → final setting of concrete → removal of end molds and side molds → steam curing and steel strand threading → pre-tensioning → removal of inner molds → re-steam curing → initial tensioning. The high-speed railway box girder prefabrication production line with multiple stations needs to split different processes in different stations, and make reasonable planning, so as to effectively solve the problems in the traditional mode. However, the key technical problem to be solved first is that, when the bottom mold carries the beam to be transferred between stations, the strength of the final setting concrete of the box girder is low, but the concrete box girder needs to be kept stable during the transfer process, and cannot be inclined or vibrated, and the concrete box girder needs to be prevented from being cracked or the bottom mold from being deformed during the transfer process. At present, the transfer of the box girder in the prefabrication yard mainly adopts the whole lifting of a beam lifting machine. In this way, the station transfer tooling device needs to suspend and carry a large-tonnage box girder to complete the station transfer, the tooling device is large and high in cost, and it is difficult to ensure that the box girder is not deformed during the transfer process, which affects the precision of the box girder forming. SUMMARY

[0004] The application discloses a bottom mould transportation construction device and method for a high-speed railway box girder prefabrication production line.

[0005] To achieve the above-mentioned purpose, the technical scheme of the application is as follows:

[0006] The bottom mould transportation construction device for the high-speed railway box girder prefabrication production line comprises:

[0007] The bottom mould transportation track is provided with at least two tracks for providing sliding tracks for the bottom mould;

[0008] The jack walking track is arranged on one side and / or both sides of the bottom mould transportation track;

[0009] The track clamping mechanism is clampedly connected with the jack walking track;

[0010] The walking push jack is connected with the track clamping mechanism at the rear end of the outer cylinder body, and the front end of the piston rod is used for pushing the bottom mould to move forward;

[0011] The jack walking vehicle is connected with the front part of the outer cylinder body of the walking push jack, and can drive the push jack to move along the jack walking track;

[0012] The track foundation comprises a raft foundation, a track strip foundation, a supporting sleeper, a pre-embedded part and a track backing plate, the track strip foundation is poured with concrete on the raft foundation, matches the number of the bottom mould transportation track, and extends along the direction of the bottom mould transportation track; the supporting sleepers are arranged at intervals along the length direction of the track strip foundation, the pre-embedded part is arranged in the supporting sleeper and the track strip foundation, the top surface of the pre-embedded part is exposed on the top surface of the supporting sleeper, the track backing plate is arranged on the top surface of the pre-embedded part, the track backing plate is at least partially made of elastic material, and the bottom mould transportation track is supported on the top surface of the track backing plate, and the pre-embedded part, the supporting sleeper and the bottom mould transportation track are fixed together.

[0013] Further, the track clamping mechanism comprises a clamping support, a clamping jack, a brake piece, a first track retaining unit, the clamping jack is fixed in the clamping support, the front end of the piston rod of the clamping jack is connected with the brake piece by penetrating the clamping support, the brake piece is arranged on the top surface of the jack walking track, the top end of the first track retaining unit is connected with the clamping support, the middle part and the lower end of the first track retaining unit clamp the jack walking track, and the clamping support is connected with the rear end of the outer cylinder body of the walking push jack.

[0014] Further, the clamping support top is detachably connected with a support sealing plate, the support sealing plate abuts against the upper surface of the clamping jack; the inner wall of the clamping support is annularly provided with a support limiting plate, a through hole is provided in the middle of the support limiting plate to match and accommodate the clamping jack, the outer cylinder of the clamping jack is fixed with a jack limiting plate, and the jack limiting plate is matched and clamped on the upper surface of the support limiting plate.

[0015] Further, the jack trolley comprises a trolley shell, a roller and a second track retaining unit, the trolley shell comprises two symmetrical trolley shell units, the upper part of the trolley shell units has a through hole to accommodate and fix the outer cylinder of the pushing jack after splicing, the lower end of the trolley shell is rollingly connected with the roller, the roller rolls on the upper surface of the jack running track, and the lower end of the trolley shell is detachably connected with the upper end of the second track retaining unit on both sides, and the middle part and the lower end of the second track retaining unit clamps the jack running track.

[0016] Further, the support pillow block is provided with a downwardly recessed track placing groove and a pushing jack placing groove on the upper surface; the track placing groove is provided with a track backing plate and a bottom die transportation track, and the pushing jack placing groove is provided with a jack running track.

[0017] Further, the bottom die transportation track comprises a track surface layer, a track support bottom plate, a track first limiting structure block and a track second limiting structure block; the track surface layer is arranged on the upper surface of the track support bottom plate, the track second limiting structure blocks are arranged on both sides of the track surface layer, the track second limiting structure blocks are fixedly connected with the track support bottom plate, and the track first limiting structure blocks are fixedly connected to the upper surfaces of the track second limiting structure blocks; the upper surface of the track second limiting structure block is not higher than the track surface layer, and the upper surface of the track first limiting structure block is higher than the track surface layer; and the two side edges of the track support bottom plate extend out of the track second limiting structure blocks.

[0018] Or the bottom die transportation track comprises a track surface layer, a track support bottom plate and a track second limiting structure block; the track surface layer is arranged on the upper surface of the track support bottom plate, and the track second limiting structure blocks are arranged on both sides of the track surface layer; the track second limiting structure blocks are fixedly connected with the track support bottom plate; the upper surface of the track second limiting structure block is not higher than the track surface layer; and the two side edges of the track support bottom plate extend out of the track second limiting structure blocks.

[0019] Further, the track foundation further comprises a limiting connecting block and a track fixing bolt, the limiting connecting block comprises a first limiting connecting unit and a second limiting connecting unit connected vertically, the first limiting connecting unit is pressed on the upper side of the track support bottom plate, and the second limiting connecting unit is arranged on the outer side of the track support bottom plate, the second limiting connecting unit, the track backing plate and the embedded part are all provided with bolt holes, and the track fixing bolt can be matched and screwed into the bolt holes of the second limiting connecting unit, the track backing plate and the embedded part.

[0020] Further, the track backing plate comprises a first track backing plate and a second track backing plate arranged in a stack from bottom to top, the first track backing plate is made of rubber material, and the second track backing plate is made of nodular cast iron material.

[0021] The transportation method of the bottom mold transportation construction device described above comprises the following steps:

[0022] S1. Fix the longitudinal beam under the bottom mold, fix the bottom mold sealing plate at the rear end, then place the bottom mold on the bottom mold transportation track, and the longitudinal beam is matched with the bottom mold transportation track;

[0023] S2. Connect the bottom mold sealing plate with the front end of the piston rod of the walking jacking jack;

[0024] S3. The track clamping mechanism is started, the clamping jacking jack walking track is clamped, the walking jacking jack piston rod is stretched forward, the bottom mold carrying the box girder is pushed along the bottom mold transportation track, after the walking jacking jack completes a pushing stroke, the track clamping mechanism is closed, the clamping jacking jack walking track is loosened, the walking jacking jack piston rod is retracted, the track clamping mechanism is moved forward, and the walking jacking jack piston rod backstroke is completed;

[0025] S4. Repeat step S3 to start the next stroke pushing operation, and the cycle is repeated until the bottom mold carrying the box girder completes the work station transfer;

[0026] S5. After completing the work station transfer, the piston rod of the walking jacking jack is separated from the bottom mold, the jacking jack walking vehicle is started, and the walking jacking jack is walked on the jacking jack walking track to return to the starting pushing position.

[0027] Further, the walking jacking bottom die pushes the bottom die through the mold pouring station, the inner mold in-out mold station, the curing pre-tensioning station, the steam curing station and the initial tensioning station in turn, the mold pouring station is used for completing assembling mold, coating release agent, embedded part installation, reinforcement cage into mold, concrete pouring and final setting, end mold and side mold removal; the inner mold in-out mold station is used for cooperating with the inner mold out of mold and into mold; the curing pre-tensioning station is used for carrying out box girder pre-tensioning strength steam curing, pre-stressed steel strand bundle threading and pre-tensioning, inner mold out of mold for the box girder transferred from the mold pouring station; the steam curing station is used for carrying out initial tensioning strength steam curing for the box girder transferred from the curing pre-tensioning station; the initial tensioning station is used for carrying out initial tensioning for the box girder transferred from the steam curing station;

[0028] The bottom die transportation track is located in the area part of the mold pouring station, and a track first limiting structure block is fixed thereon and is arranged on both sides of the position through which the longitudinal beam passes.

[0029] The bottom die transportation construction device and method of the high-speed railway box girder precast production line achieve low disturbance, high efficiency and high precision transportation of the bottom die carrying the box girder through the following key technologies:

[0030] (1) The raft foundation and the track strip foundation for concrete pouring are used as the force bearing part of the bottom die transportation track, the raft foundation improves the integrity of the production line track foundation, the overall stiffness is greatly improved, and the foundation resistance to uneven settlement is effectively enhanced, the track strip foundation can further improve the strength of the force bearing foundation, effectively reduce the possibility of uneven settlement of the concrete foundation, and ensure the normal operation of the precast production line.

[0031] (2) The bottom die transportation track is arranged on the support pillow block, the support pillow blocks are arranged at intervals on the track strip foundation and are higher than the track strip foundation by a certain height, which facilitates the adjustment operation of the track flatness. In addition, track pads are arranged between the bottom die transportation track and the support pillow block, which can improve the shock absorption performance and impact resistance, reduce the impact on the concrete foundation, reduce the possibility of settlement of the concrete foundation, and adjust the bottom support height of the bottom die transportation track by replacing the corresponding height size track pad, so as to meet the flatness control requirements of the bottom die transportation track.

[0032] (3) The bottom die carrying the box girder is pushed by the hydraulic jack to transfer the work station, the resistance of the work station transfer is converted into the sliding friction resistance of the bottom die longitudinal beam on the track, the large-scale hoisting equipment is not needed to realize the transfer of the box girder, and the deformation caused by the self-weight of the box girder during hoisting is also avoided, the work station transfer tool has low manufacturing cost, small size and simple use, the transportation control links are few, the displacement is accurate and easy to control, and the high-speed railway box girder precast work station transfer problem is solved at low cost, high efficiency and high precision. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a schematic diagram of the longitudinal structure when the present application is applied.

[0034] Figure 2 is a schematic diagram of the transverse structure when the present application is applied.

[0035] Figure 3 is a schematic diagram of the transverse structure of another embodiment when the present application is applied.

[0036] Figure 4 is a schematic diagram of the structure of the present application.

[0037] Figure 5 is a schematic diagram of the enlarged structure of the track clamping mechanism in Figure 4 view.

[0038] Figure 6 is a schematic diagram of the cross-sectional structure of Figure 5 .

[0039] Figure 7 is a schematic diagram of the enlarged structure of the jack trolley in Figure 4 view.

[0040] Figure 8 is a schematic diagram of the cross-sectional structure of Figure 7 .

[0041] Figure 9 is a schematic diagram of the left view of the track surface layer and the track support bottom plate.

[0042] Figure 10 is a schematic diagram of the top view of the track surface layer and the track support bottom plate.

[0043] Figure 11 is a schematic diagram of the left view of another embodiment of the track surface layer and the track support bottom plate.

[0044] Figure 12 is a schematic diagram of the enlarged structure of the push point connecting structure in Figure 4 view.

[0045] Figure 13 is a schematic diagram of the station arrangement of the high-speed railway box girder prefabrication production line.

[0046] In the figure, the bottom die 1, the track clamping mechanism 2, the support sealing plate 201, the clamping support 202, the clamping jack 203, the jack limiting plate 204, the support limiting plate 205, the brake piece 206, the first track retaining unit 207, the connecting lug plate 208, the brake piece fixing bolt 209, the jack running track 3, the longitudinal beam 4, the track first limiting structure block 5, the track surface layer 6, the track support bottom plate 7, the track strip foundation 8, the raft foundation 9, the embedded part 10, the pushing jack placing groove 11, the track fixing bolt 12, the first track backing plate 13, the second track backing plate 14, the support pillow block 15, the limiting connecting block 16, the jack running car 17, the running car shell 1701, the shell fixing bolt 1702, the roller 1703, the second track retaining unit 1704, the retaining unit fixing bolt 1705, the running pushing jack 18, the bottom die sealing plate 19, the track second limiting structure block 20, the lug plate pin shaft 21, the running pushing jack limiting plate 22, the pushing point connecting structure 23, the hinged support 2301, the flange connecting piece 2302, the mold closing pouring station 24, the inner mold in-out mold station 25, the maintenance pre-tensioning station 26, the steam curing station 27, and the initial tensioning station 28. Embodiment

[0047] The application is further described below in conjunction with specific embodiments and drawings, but the scope of protection of the application is not limited to the following embodiments.

[0048] The bottom die transportation construction device for the high-speed railway box girder prefabrication production line, as shown in Figures 1-3 The bottom die transportation construction device for the high-speed railway box girder prefabrication production line, as shown in Figure 4As shown, the jack running track 3 is arranged on one side and / or both sides of the bottom mold transport track, the number is consistent with the running push jack 18, and the track provides a load bearing track for the movement of the running push jack 18. Generally, it is double and symmetrically distributed to keep the bottom mold rear end pushing force balanced and uniform. The track clamping mechanism 2 is clamped with the jack running track 3, that is, when the running push jack 18 is pushed, the jack running track 3 is clamped to form a counterforce to ensure that the running push jack 18 does not move backward. When it is necessary to adjust the position of the running push jack 18, the jack running track 3 is released to complete the adjustment of the position of the running push jack 18. The running push jack 18 is connected with the track clamping mechanism 2 at the rear end of the outer cylinder body, and the front end of the piston rod is used to push the bottom mold 1 to move forward to adjust the bottom mold 1 to the appropriate station. The hydraulic jack is adopted. The jack running vehicle 17 is connected with the front part of the outer cylinder body of the running push jack 18 and can drive the push jack to move along the jack running track 3. The jack running vehicle 17 has a rolling structure, which can help the running push jack 18 to realize the adjustment of the position under the condition of external driving or self-driving, such as driving the rolling structure by using the motor to realize the adjustment of the position of the running push jack 18.The track foundation comprises a raft foundation 9, a track strip foundation 8, a support sleeper 15, a pre-embedded part 10 and a track pad plate. The track strip foundation 8 is poured with concrete on the raft foundation 9, matches the number of the bottom mold transportation track and extends along the direction of the bottom mold transportation track. The bottom mold transportation track is generally arranged in parallel, and then the track strip foundation 8 is also arranged in parallel. The raft foundation 9 and the track strip foundation 8 are reinforced concrete foundations and are main bearing parts in the process of the high-speed box girder prefabrication. The raft foundation 9 improves the integrity of the track foundation of the production line, greatly improves the overall rigidity and effectively enhances the ability of the foundation to resist uneven settlement. The support sleeper 15 is arranged at intervals along the length direction of the track strip foundation 8 and is also generally arranged at equal intervals to ensure the flatness and stability of the track. The support sleeper 15 is higher than the plane of the track strip foundation 8 by a certain height, which facilitates the adjustment operation of the flatness of the track. The support sleeper 15 and the track strip foundation 8 are provided with the pre-embedded part 10. The top surface of the pre-embedded part 10 is exposed above the support sleeper 15. The pre-embedded part 10 is pre-embedded in the pouring track strip foundation 8 when pouring the track strip foundation 8. The connecting steel plate on the top surface of the pre-embedded part 10 can be installed after the pouring of the sleeper 15. The connecting steel plate can be welded and is part of the pre-embedded part 10. The pre-embedded part 10 can enhance the integrity of the support sleeper 15 and the track strip foundation 8, is made of steel structure and is convenient for fixing the track pad plate and the bottom mold transportation track. The track pad plate is arranged on the pre-embedded part 10 and has a length along the extension direction of the bottom mold transportation track, which is generally not more than the length of the support sleeper 15, that is, the track pad plate is also arranged at intervals along the length direction of the track strip foundation 8. The track pad plate is at least partially made of elastic material. The elastic material can improve the shock absorption performance and impact resistance. The box girder prefabrication process needs template assembly, vibration and other processes, which will cause impact on the concrete foundation. The use of elastic material can make up for the insufficient rigidity of the concrete structure, protect the raft foundation 9 and the support sleeper 15. At the same time, by adjusting the height of the track pad plate, the support height of the bottom of the bottom mold transportation track can also be adjusted to ensure the flatness of the bottom mold transportation track. The bottom mold transportation track is supported on the track pad plate, and the pre-embedded part 10, the support sleeper 15 and the bottom mold transportation track are fixed together. The weight of the box girder is borne by the strip-shaped track foundation. The bottom mold transportation track is arranged on the track foundation. The surface layer of the bottom mold transportation track is made of low-friction coefficient polytetrafluoroethylene synthetic material. The work station transfer is completed by the hydraulic jack pushing device. The work station transfer resistance is converted into the longitudinal beam sliding friction resistance of the bottom mold on the track. The pushing moving mode can realize the transfer of the box girder without large lifting equipment and will not cause deformation due to the self-weight of the box girder in the lifting process. The low-cost, high-efficiency and high-precision solution solves the problem of the work station transfer of the high-speed railway box girder prefabrication.

[0049] In addition, before constructing a precast box girder production line for high-speed railways, it is best to conduct a geological survey. If the geological conditions are favorable, a natural foundation should be used uniformly. This natural foundation should undergo treatment to reduce its porosity and moisture content. Vibration and compression methods should be used to increase the foundation's strength through external force, reduce compressibility, and ensure the correct concrete porosity. Drainage and consolidation methods should be used to reduce the foundation's moisture content and increase its consolidation, thereby strengthening its shear strength. If the geological conditions do not permit the use of a natural foundation, a composite foundation should be used. This involves replacing the soft soil in the shallow soft soil foundation with higher-strength materials such as sand, lime, fly ash, and crushed stone using a replacement method. The compaction and replacement method should then be used to allow the replacement material to form a composite foundation with the surrounding soil, thereby increasing the foundation's bearing capacity and reducing settlement.

[0050] Furthermore, in combination Figure 5 and Figure 6 As shown, the track clamping mechanism 2 includes a clamping support 202, a clamping jack 203, a brake pad 206, and a first track holding unit 207. The clamping jack 203 is fixed inside the clamping support 202, and its piston rod extends out of the clamping support 202 and connects to the brake pad 206. The brake pad 206 is disposed on the jack travel track 3. When the clamping jack 203 pushes downward, the brake pad 206 and the jack travel track 3 generate positive pressure. When the traveling jack 18 pushes, under the action of the pushing force, friction is generated between the brake pad 206 and the jack travel track 3, causing the track to... The clamping mechanism 2 is locked at a preset position on the jack travel track 3; the upper end of the first track holding unit 207 is connected to the clamping support 202, and the middle and lower ends clamp the jack travel track 3, so that the track clamping mechanism 2 will not deviate in the left and right directions, ensuring the straightness of the jacking jack 18. The jack travel track 3 is generally made of rail steel with an I-shaped cross section. The first track holding unit 207 is generally hook-shaped, with the middle part crossing the upper flange of the I-shaped cross section and the lower end engaging the recessed web plate; the clamping support 202 is connected to the rear end of the outer cylinder of the jacking jack 18. The clamping jack 203 is a hydraulic jack. When the traveling jack 18 pushes, the piston rod of the clamping jack 203 extends downward, causing the brake pad 206 to press against the jack travel track 3. Due to the huge positive pressure generated between the brake pad 206 and the jack travel track 3, when the traveling jack 18 pushes, a large frictional force is generated between the brake pad 206 and the jack travel track 3 under the action of the pushing force, so that even when the clamping support 202 is subjected to the reaction force of the traveling jack 18, the entire track clamping mechanism 2 will not move backward.

[0051] Further, the embodiment provides a specific structure of the clamping support 202 fixing the clamping jack 203. The top of the clamping support 202 is detachably connected with the support cover plate 201, the support cover plate 201 abuts against the upper surface of the clamping jack 203, and the support cover plate 201 abuts against the clamping jack 203 to prevent the clamping jack 203 from moving upward when the clamping jack 203 exerts a downward thrusting force. The inner wall of the clamping support 202 is annularly provided with the support limiting plate 205, and a through hole is provided in the middle of the support limiting plate 205 to match and accommodate the clamping jack 203. The outer wall of the outer cylinder of the clamping jack 203 is fixed with the jack limiting plate 204, which can be annular or two linear plates and is matched and clamped on the upper surface of the support limiting plate 205. The through hole of the support limiting plate 205 and the limiting of the support limiting plate 205 to the jack limiting plate 204 make the clamping jack 203 not horizontally and downwardly displace in the clamping support 202. The main body of the clamping support 202 can be hollow and cylindrical, and the lower end is provided with the support connecting plate for connecting with the first track retaining unit 207. For easy disassembly, the support connecting plate and the first track retaining unit 207 are connected by bolts. In addition, the brake pad 206 can adopt a structure similar to the current automobile brake pad, including a brake steel plate, a bonding heat insulation layer and a friction block. The bonding heat insulation layer is connected with the friction block below and connected with the brake steel plate above. In addition, for easy connection, the brake steel plate is provided with a groove matched with the front end of the piston rod of the clamping jack 203. The groove surrounded by the brake steel plate and the bonding heat insulation layer below is connected with the front end of the piston rod of the clamping jack 203 through the brake pad fixing bolt 209. When the hydraulic stepping thrusting device thrusts the bottom die 1 to move to the next station, a thrusting force of more than 9t needs to be completed, and the thrusting force is large. The mechanical structure of the traditional track clamping device does not meet the requirements of track clamping, fixing and positioning. The embodiment adopts the hydraulic jack to thrust the brake pad 206 to contact the walking track 3 of the jack to form a friction locking mode, which effectively solves the problem of insufficient locking force in the mechanical structure.

[0052] Further, to better realize the stable connection between the track clamping mechanism 2 and the walking and thrusting jack 18, a clamping seat is arranged on one side of the clamping support 202. The clamping seat is a recessed groove inwardly recessed and used for clamping the rear end of the outer cylinder of the walking and thrusting jack 18. Therefore, the recessed groove is matched with the rear end of the outer cylinder of the walking and thrusting jack 18. A connecting lug plate 208 is arranged at a position close to the clamping seat of the clamping support 202 and used for connecting with the walking and thrusting jack 18. Correspondingly, the walking and thrusting jack 18 is fixed with a lug pin shaft 21 provided with a pin hole. The connecting lug plate 208 and the lug pin shaft 21 can be fixed by bolt connection. The connecting lug plate 208 and the lug pin shaft 21 can be matched with one set or multiple sets.

[0053] Further, the embodiment provides a preferred structure of the jack walking vehicle 17, which is combined with the track clamping mechanism 2 and the walking and thrusting jack 18. Figure 7 andFigure 8 As shown, the jack trolley 17 includes a trolley shell 1701, a roller 1703 and a second track holding unit 1704, the trolley shell 1701 includes two symmetrical trolley shell 1701 units, after splicing, the upper part has a through hole to accommodate the outer cylinder of the pushing jack to pass through and fix it, the outer side of the two trolley shell units is provided with a shell connecting plate, the shell connecting plate is provided with a connecting hole, a shell fixing bolt 1702 passes through the connecting hole to realize fixed connection, the shell fixing bolt 1702 is convenient to disassemble and replace, the two symmetrical trolley shell units enclose the walking pushing jack 18, which can better prevent it from shifting left and right; the lower end of the trolley shell 1701 is rollingly connected with the roller 1703, the roller 1703 rolls on the top of the jack walking track 3, so as to drive the walking pushing jack 18 to move and complete the position adjustment, a gap is arranged between the lower ends of the trolley shell units to accommodate the roller 1703, the roller shaft of the roller 1703 is connected with the outer end of the trolley shell unit through a bearing, the roller shaft can be driven by a motor, so that the walking of the jack trolley 17 can be realized; the lower end of the trolley shell 1701 is detachably connected with the upper end of the second track holding unit 1704, the connection mode can be that the holding unit fixing bolt 1705 is used for bolt connection as shown in Figure 8 The middle and lower ends of the second track holding unit 1704 clamp the jack walking track 3, the second track holding unit 1704 can adopt the same structure as the first track holding unit 207 and has similar functions, that is, to prevent the trolley shell 1701 from shifting left and right, thereby ensuring the linear pushing of the walking pushing jack 18 to the bottom mold 1. As shown, Figure 4 As shown, for the fixing between the jack trolley 17 and the walking pushing jack 18, in addition to using the trolley shell 1701 to form clamping on the walking pushing jack 18, a protruding walking pushing jack limiting plate 22 is arranged at the position where the walking pushing jack 18 is located on the two sides of the trolley shell 1701, so as to better prevent the relative displacement of the walking pushing jack 18 and the jack trolley 17.

[0054] In addition, for the connection of the walking pushing jack 18 and the bottom mold 1, a detachable connection structure can be used for connection, for example, a pushing point connection structure 23 is shown in the embodiment, one end of the pushing point connection structure 23 is detachably connected with the piston rod of the walking pushing jack 18, the other end is detachably connected with the bottom mold 1 or a bottom mold connecting piece, Figure 1 As shown in, the bottom mold connecting piece is a bottom mold sealing plate 19, the bottom mold sealing plate 19 is connected with the rear end of the bottom mold 1 and extends downward, so that the walking pushing jack 18 can be arranged horizontally to push the bottom mold sealing plate 19, and the bottom mold sealing plate 19 needs to have space to accommodate the bottom mold transportation track, so as to ensure the smooth pushing. More specifically, in combination withFigure 12 As shown, the pushing point connecting structure 23 comprises a flange connecting piece 2302 and a hinged support 2301, one side of the flange connecting piece 2302 is detachably connected with the bottom die or the bottom die connecting piece, and the other side is connected with the hinged support 2301, and the hinged support 2301 is hinged with the piston rod of the walking pushing jack 18. For the connection of the flange connecting piece 2302 with the bottom die 1 or the bottom die sealing plate 19, a conventional flange connection is adopted, and the connection is achieved by bolts. For the connection of the flange connecting piece 2302 with the hinged support 2301, welding or bolt fixing can be adopted. The front end of the hinged support 2301 is hinged with the front end of the piston rod of the walking pushing jack 18 to leave a certain adjustment space, so that the piston rod of the walking pushing jack 18 forms a self-adapting straight pushing form with the bottom die 1. The structure of the spherical hinge can be various, and an arc-shaped groove can be arranged on the side of the hinged support away from the flange connecting piece 2302, which is matched with the front end of the piston rod of the walking pushing jack 18, so that the front end of the piston rod of the walking pushing jack 18 can slide in the arc-shaped groove to a certain extent. The rear side of the arc-shaped groove is provided with a limiting block, the outer end of the limiting block is connected with the hinged support 2301, and the inner end of the limiting block partially blocks the front end of the piston rod of the walking pushing jack 18 to prevent it from being separated from the arc-shaped groove.

[0055] Further, as shown in Figures 2-3 The support pillow block 15 is provided with a downwardly recessed rail placing groove and a pushing jack placing groove 11 on the upper surface; the rail placing groove is provided with a rail pad and a bottom die transportation rail, and the pushing jack placing groove 11 is provided with a jack walking rail 3. The recessed groove is arranged to place the jack walking rail 3 and the bottom die transportation rail, so that the jack walking rail 3 and the bottom die transportation rail do not protrude from the upper surface of the support pillow block 24, and some related transverse movement operations in the subsequent process, such as the transverse movement operation of the inner die, the end die and the bottom die, can be facilitated.

[0056] Further, as shown in Figure 9 and Figure 10As shown, the bottom mold transportation track includes a track surface layer 6, a track support bottom plate 7, a track first limiting structure block 5 and a track second limiting structure block 20; the track surface layer 6 is arranged above the track support bottom plate 7, generally in the middle, made of polytetrafluoroethylene synthetic material, in contact with the longitudinal beam 4, and the width is less than that of the track support bottom plate 7, matched with the width of the longitudinal beam 4; the track surface layer 6 is provided with the track second limiting structure block 20 on both sides, the track second limiting structure block 20 is fixedly connected with the track support bottom plate 7, and the track support bottom plate 7 and the track second limiting structure block 20 are both made of steel material and can be fixed by welding. The track first limiting structure block 5 is fixedly connected to the upper surface of the track second limiting structure block 20, and the track first limiting structure block 5 is also made of steel material and can be fixedly connected with the track second limiting structure block 20 by welding; the upper surface of the track second limiting structure block 20 is not higher than the track surface layer 6, which can limit the left and right displacement of the track surface layer 6, and the upper surface of the track first limiting structure block 5 is higher than the track surface layer 6. In the process of template assembly and other processes, in order to prevent the whole from rotating and deviating during the box girder pouring construction, the track first limiting structure block 5 is used to limit the displacement of the longitudinal beam 4; the two side edges of the track support bottom plate 7 extend beyond the track second limiting structure block 20, so as to facilitate the installation of fixing members such as bolts. For the bottom mold transportation track, another specific structure can also be used, as shown in Figure 11 As shown, including a track surface layer 6, a track support bottom plate 7 and a track second limiting structure block 20; the track surface layer 6 is arranged above the track support bottom plate 7, and the track second limiting structure block 20 is arranged on both sides of the track surface layer 6, and the track second limiting structure block 20 is fixedly connected with the track support bottom plate 7, and the upper surface of the track second limiting structure block 20 is not higher than the track surface layer 6; the two side edges of the track support bottom plate 7 extend beyond the track second limiting structure block 20, and the structure is the same as Figure 9 and Figure 10 Compared with the structure shown in the figure, the main difference is that the track first limiting structure block 5 is not arranged, which can be applied to pre-tensioning, curing, initial tensioning and other stations. The bottom mold carries the box girder mainly on the bottom mold transportation track, without complex operation of making the bottom mold deviate, so the track first limiting structure block 5 is not arranged, and the track first limiting structure block 5 is not arranged, which can facilitate some related transverse operation in the subsequent process, such as the transverse operation of the inner mold, the end mold and the bottom mold.

[0057] Further, the embodiment also provides a structure for conveniently fixing the bottom mold transportation track, and the track foundation further comprises a limiting connecting block 16 and a track fixing bolt 12. The limiting connecting block 16 comprises a first limiting connecting unit and a second limiting connecting unit which are vertically connected. The first limiting connecting unit is pressed on the upper side of the track support bottom plate 7, and the second limiting connecting unit is arranged on the outer side of the track support bottom plate 7 and also on the upper side of the track base plate. The second limiting connecting unit, the track base plate and the embedded part 10 are all provided with bolt holes. The bolt holes in the embedded part 10 are generally blind holes. The track fixing bolt 12 can be matched and screwed into the bolt holes of the second limiting connecting unit, the track base plate and the embedded part 10, so that the bottom mold transportation track and the track base plate are fixed on the upper side of the embedded part 10. The second limiting connecting unit is preferably provided with a bolt head groove to protect the track fixing bolt 12 from being easily collided.

[0058] Further, the embodiment provides a specific structure of the track base plate. Figures 1-3 As shown in the figure, the track base plate comprises a first track base plate 13 and a second track base plate 14 which are arranged in a stack from bottom to top. The first track base plate 13 is made of rubber material, such as EPDM material, which has excellent aging resistance. The main function of the first track base plate 13 is to play a damping role between the bottom mold transportation track and the lower concrete support foundation. The second track base plate 14 is made of ductile cast iron material, which has excellent strength, toughness and wear resistance. As a component of the track base plate, the track base plate has good damping performance and impact resistance, and the thickness of the track base plate can be made into a series. In use, according to the change of track flatness, the corresponding height size track base plate is replaced to adjust the support height of the bottom mold transportation track, so as to meet the flatness control requirements of the bottom mold transportation track. Of course, the first track base plate 13 and the second track base plate 14 are both provided with bolt holes, which are fixed by the track fixing bolt 12.

[0059] In this embodiment, taking a 40.6m high-speed railway box girder as an example, the weight is 925t, which is installed under the bottom die through H400*400mm longitudinal beam 4, the bearing bottom die 1 slides, the track surface layer 6 is provided with 50mm polytetrafluoroethylene material, the general polytetrafluoroethylene material is referenced as 0.04 for the friction coefficient of steel, the position transfer pushing resistance is 925t*0.04, i.e. 37t. Three bottom die transportation tracks are needed to be set, the jack running track 3 is symmetrically arranged on both sides of the middle bottom die transportation track, the bottom die transportation tracks on both sides are symmetrically distributed on both sides of the middle bottom die transportation track, and the jack running track 3 is arranged on the inside, and the jack running track 3 is arranged symmetrically with the center line of the middle bottom die transportation track as the axis of symmetry, and the running pushing jack 18 above the jack running track 3 is synchronously controlled, so as to ensure that the stress of the bottom die 1 is balanced, and the jack running track 3 is made of I-shaped section track steel. Four running pushing jacks 18 bear 37t pushing force, and each jack pushing force is 9.25t.

[0060] The transportation method of the above bottom die transportation construction device comprises the following steps:

[0061] S1. The longitudinal beam 4 is fixed under the bottom die 1, the position of the longitudinal beam 4 matches the position of the bottom die transportation track, the rear end is fixed with the bottom die sealing plate 19, then the bottom die 1 is placed on the bottom die transportation track, and the longitudinal beam 4 matches the bottom die transportation track.

[0062] S2. The bottom die sealing plate 19 is connected with the piston rod front end of the running pushing jack 18 through the pushing point connecting structure 23.

[0063] S3. The track clamping mechanism 2 is started, the jack running track 3 is clamped, the piston rod of the running pushing jack 18 is stretched forward, the bottom die 1 carrying the box girder runs along the bottom die transportation track, after the running pushing jack 18 completes a pushing stroke, the track clamping mechanism 2 is closed, the jack running track 3 is released by the track clamping mechanism 2, the piston rod of the running pushing jack 18 is retracted, the track clamping mechanism 2 is driven to move forward, and the piston rod return stroke of the running pushing jack 18 is completed.

[0064] S4. Repeat step S3 to start the next stroke pushing operation, and cycle until the bottom die 1 carrying the box girder completes the position transfer.

[0065] S5. After completing the position transfer, the piston rod of the running pushing jack 18 is separated from the bottom die 1, the jack running vehicle 17 is started, and the running pushing jack 18 is driven to run on the jack running track 3 to return to the starting pushing position.

[0066] Further, the high-speed railway box girder prefabrication production line needs to separate different processes in different positions, and the embodiment divides a plurality of positions according to the prefabrication process of the box girder, and combines Figure 13As shown, the traveling top pushing jack 18 pushes the bottom die 1 to travel, and sequentially passes through the die assembly and pouring station 24, the inner die in and out die station 25, the curing and pre-tensioning station 26, the steam curing station 27 and the initial tensioning station 28. The die assembly and pouring station 24 is used to complete the assembly of the die, the installation of the embedded parts, the pouring of the concrete, the removal of the end die and the side die, and the removal of the end die and the side die. The inner die in and out die station 25 is used to cooperate with the die out and in. The curing and pre-tensioning station 26 is used to pre-tension the box girder transferred from the die assembly and pouring station 24, and to pre-tension the box girder. The steam curing station 27 is used to pre-tension the box girder transferred from the curing and pre-tensioning station 26. The initial tensioning station 28 is used to pre-tension the box girder transferred from the steam curing station. According to the process arrangement in each station, the bottom die transport track is located in the area of the die assembly and pouring station 24, and the track first limiting structure block 5 is fixed thereon. The track first limiting structure block 5 is matched and arranged on both sides of the position through which the longitudinal beam 4 passes, that is, the bottom die transport track as shown in Figure 9 and Figure 10 The bottom die transport track is used to limit the longitudinal beam 4 to prevent the whole rotation and deviation of the box girder during the pouring construction process. However, the bottom die transport track as shown in Figure 11 is used in the inner die in and out die station 25, the curing and pre-tensioning station 26, the steam curing station 27 and the initial tensioning station 28, and the track first limiting structure block 5 protruding from the track surface layer 6 is not required to be installed.

Claims

1. A construction method of a bottom mold transportation construction device of a high-speed railway box girder prefabrication production line, characterized in that: the bottom mold transportation construction device of the high-speed railway box girder prefabrication production line comprises: a bottom mold transportation track, at least two of which are provided to provide a sliding track for the bottom mold; a jack walking track provided on one side and / or both sides of the bottom mold transportation track; a track clamping mechanism connectable to the jack walking track in a clamped manner; a walking pushing jack, the rear end of the outer cylinder of which is connected to the track clamping mechanism, and the front end of the piston rod of which is used to push the bottom mold to move forward; a jack walking vehicle connected to the front part of the outer cylinder of the walking pushing jack and capable of moving the pushing jack along the jack walking track; and a track foundation comprising a raft foundation, a track strip foundation, a support sleeper, a pre-embedded part and a track backing plate, the track strip foundation being poured with concrete on the raft foundation, matching the number of the bottom mold transportation tracks and extending along the direction of the bottom mold transportation tracks; the support sleepers being arranged at intervals along the length direction of the track strip foundation, the support sleepers and the track strip foundation being provided with the pre-embedded part, the top surface of the pre-embedded part being exposed on the top surface of the support sleeper, the track backing plate being provided on the top surface of the pre-embedded part, the track backing plate being at least partially made of elastic material and supporting the bottom mold transportation track thereon, and the pre-embedded part, the support sleeper and the bottom mold transportation track being fixed together. The construction method comprises the following steps: the walking pushing jack pushes the bottom mold to pass through a mold assembly and pouring station, an inner mold in-out station, a curing and pre-tensioning station, a steam curing station and a primary tensioning station in sequence, the mold assembly and pouring station is used for completing assembly of molds, coating of release agent, installation of pre-embedded parts, entry of reinforcement cages into molds, pouring of concrete and final setting, and removal of end molds and side molds; the inner mold in-out station is used for cooperating with the entry and exit of the inner mold; the curing and pre-tensioning station is used for carrying out box girder pre-tensioning strength steam curing, pre-stressed steel strand bundle threading and pre-tensioning, and inner mold exit of the box girder transferred from the mold assembly and pouring station; the steam curing station is used for carrying out primary tensioning strength steam curing of the box girder transferred from the curing and pre-tensioning station; and the primary tensioning station is used for carrying out primary tensioning of the box girder transferred from the steam curing station.

2. The construction method according to claim 1, characterized in that: the track clamping mechanism comprises a clamping support, a clamping jack, a brake piece and a first track retaining unit, the clamping jack being fixed inside the clamping support, the front end of the piston rod of the clamping jack penetrating through the clamping support and being connected to the brake piece; the brake piece being provided on the top surface of the jack walking track; the first track retaining unit being connected to the clamping support at the upper end, clamping the jack walking track at the middle and lower ends; and the clamping support being connected to the rear end of the outer cylinder of the walking pushing jack.

3. The construction method according to claim 2, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ The clamping support top is detachably connected with a support sealing plate, which is abutted to the upper surface of the clamping jack; the inner wall of the clamping support is annularly provided with a support limiting plate, which is provided with a through hole in the middle to match and accommodate the clamping jack passing through; the outer cylinder body of the clamping jack is fixed with a jack limiting plate, which is matched and clamped on the upper surface of the support limiting plate.

4. The construction method of claim 1, wherein: The jack traveling trolley comprises a trolley shell, a roller and a second track retaining unit, the trolley shell comprises two symmetrical trolley shell units, after splicing, the upper part of the trolley shell units has a through hole to accommodate and fix the outer cylinder body of the pushing jack; the lower end of the trolley shell is rollingly connected with the roller, the roller rolls on the upper surface of the jack traveling track; the lower end of the trolley shell is detachably connected with the upper end of the second track retaining unit on both sides, and the middle and lower end of the second track retaining unit clamps the jack traveling track.

5. The construction method of claim 1, wherein: The support pillow block is provided with a downwardly recessed track placing groove and a pushing jack placing groove on the upper surface; the track placing groove is provided with a track backing plate and a bottom die transportation track; and the pushing jack placing groove is provided with a jack traveling track.

6. The construction method of claim 1, wherein: The bottom die transportation track comprises a track surface layer, a track support bottom plate, a track first limiting structure block and a track second limiting structure block; the track surface layer is arranged on the track support bottom plate, both sides of the track surface layer are provided with the track second limiting structure block, the track second limiting structure block is fixedly connected with the track support bottom plate, and the track first limiting structure block is fixedly connected to the upper surface of the track second limiting structure block; the upper surface of the track second limiting structure block is not higher than the track surface layer, and the upper surface of the track first limiting structure block is higher than the track surface layer; and both sides of the track support bottom plate extend beyond the track second limiting structure block. Or the bottom die transportation track comprises a track surface layer, a track support bottom plate and a track second limiting structure block; the track surface layer is arranged on the track support bottom plate, both sides of the track surface layer are provided with the track second limiting structure block, and the track second limiting structure block is fixedly connected with the track support bottom plate; the upper surface of the track second limiting structure block is not higher than the track surface layer; and both sides of the track support bottom plate extend beyond the track second limiting structure block.

7. The construction method of claim 6, wherein: The track foundation further comprises a limiting connecting block and a track fixing bolt, the limiting connecting block comprises a first limiting connecting unit and a second limiting connecting unit which are vertically connected, the first limiting connecting unit is pressed on one side of the upper surface of the track support bottom plate, and the second limiting connecting unit is arranged on the outer side surface of the track support bottom plate; the second limiting connecting unit, the track backing plate and the embedded part are all provided with bolt holes, and the track fixing bolt can be matched and screwed into the bolt holes of the second limiting connecting unit, the track backing plate and the embedded part.

8. The construction method of claim 1, wherein: the track base plate comprises a first track base plate and a second track base plate stacked from bottom to top, the first track base plate is made of rubber material, and the second track base plate is made of nodular cast iron material.

9. The construction method of any one of claims 1-8, wherein: the traveling push jacking-up of the bottom die comprises the following steps: S1. fixing the longitudinal beam under the bottom die, fixing the bottom die sealing plate at the rear end, and then placing the bottom die on the bottom die transportation track, the longitudinal beam being matched with the bottom die transportation track; S2. connecting the bottom die sealing plate with the front end of the piston rod of the traveling push jacking-up; S3. starting the track clamping mechanism to clamp the jacking-up track, the front end of the piston rod of the traveling push jacking-up extending, the bottom die carrying the box girder traveling along the bottom die transportation track, after the traveling push jacking-up completing a jacking-up stroke, the track clamping mechanism being closed, the jacking-up track being released by the track clamping mechanism, the piston rod of the traveling push jacking-up retracting to drive the track clamping mechanism to move forward, and the piston rod of the traveling push jacking-up completing a return stroke; S4. repeating step S3 to start the next stroke jacking-up operation, and thus circulating until the bottom die carrying the box girder completes the work station transfer; S5. after completing the work station transfer, the piston rod of the traveling push jacking-up being separated from the bottom die, and starting the jacking-up traveling vehicle to drive the traveling push jacking-up to travel on the jacking-up track to return to the starting jacking-up position.

10. The construction method of claim 9, wherein: the bottom die transportation track is located in the area of the die assembly pouring work station, and the track first limiting structure block is fixed thereon and arranged on both sides of the position passed by the longitudinal beam.

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