Railway support cast-in-place box girder outer side formwork assembly and construction method

Abstract

The invention discloses a railway support cast-in-place box girder outer side formwork general assembly and a construction method, and particularly relates to the technical field of railway bridges, the railway support cast-in-place box girder outer side formwork general assembly comprises a cast-in-place box girder support laid along a track distributed along a pier, a plurality of support distribution girders laid along the track at equal intervals are installed above the cast-in-place box girder support, and two sets of walking tracks are distributed above the cast-in-place box girder support; the two groups of walking systems are respectively composed of a plurality of walking trolleys which are symmetrically distributed along the two groups of walking tracks, the walking trolleys are distributed at equal intervals, two sides of the bottom of each walking trolley are respectively clamped on two single tracks of the walking tracks, and the top end of each walking trolley supports a plurality of box girder outer side templates. After hydraulic demolding of a first hole beam of a working face, the outer side formwork can be driven by a motor to rapidly walk to a next hole support to be accurately aligned along a rail installed on the support, and then the horizontal position and the elevation of the formwork are accurately calibrated through a hydraulic oil cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of railway bridges, and more specifically to an assembly and construction method of an outer side formwork of a railway support cast-in-place box girder. Background Art

[0002] There are two main installation and removal processes for the outer formwork of the cast-in-place box girder of the railway support: the first is to use a truck crane to lift, assemble, adjust and disassemble each piece by piece, which requires frequent lifting operations during construction, has high safety risks, and has the disadvantages of a long template installation and removal cycle and large site occupation. The other is to use manpower to push the outer formwork piece by piece through the track installed on the support to the support of the next hole box girder, and then use the truck crane to calibrate and demould, and the operator works on the edge of the support, which has high safety risks and low construction efficiency.

[0003] Therefore, we proposed a railway support cast-in-place box girder outer formwork assembly and construction method to solve the above problems.

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides an assembly and construction method of the outer formwork of a cast-in-place box girder of a railway support. Through the outer formwork of the box girder and a walking trolley, the outer formwork can be driven by a motor after the hydraulic demolding of the first hole beam of the working surface, and can quickly move along the track installed on the support to the next hole support for precise alignment, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: The cast-in-place box girder support is laid along the track distributed along the bridge piers, and several support distribution beams are installed on the top, which are laid equidistantly along the track. Two sets of walking tracks are distributed above the cast-in-place box girder support. The two sets of walking tracks are symmetrically distributed on both sides of the cast-in-place box girder support and maintain a vertical angle with the support distribution beam. Each set of walking tracks consists of two single tracks in parallel and are connected by track flat-joint channel steel in the middle; The two groups of walking systems are composed of a number of walking trolleys symmetrically distributed along the two groups of walking tracks. Each walking trolley is evenly distributed. The two sides of the bottom of each walking trolley are respectively clamped on the two single tracks of the walking track. The top of each walking trolley supports a number of box girder outer templates.

[0006] In a preferred embodiment, the single track is assembled by connecting a plurality of I-beam tracks laid on top of a cast-in-place box beam support in sequence, a longitudinal track connecting plate is arranged between two adjacent I-beam tracks for fixation, each of the I-beam tracks is overlapped above the end of the support distribution beam, and an inverted U-shaped bolt is arranged to fix the I-beam track and the support distribution beam, a parallel connection interface is arranged at the position of each I-beam track corresponding to the track parallel connection channel steel, and the two parallel I-beam tracks are connected and fixed to the track parallel connection channel steel in the middle through the parallel connection interface.

[0007] In a preferred embodiment, the traveling trolley includes a frame presenting a transverse I-shape, the frame consisting of two longitudinal rods arranged along the I-beam track and a central crossbeam, a driving wheel and a driven wheel are respectively installed at the front and rear ends of the longitudinal rod, and a traveling motor is arranged at a position of the longitudinal rod on one side of the driving wheel to drive the driving wheel.

[0008] In a preferred embodiment, each group of walking systems includes six walking trolleys, and every three walking trolleys are grouped into one group, which are connected to a distribution box to control the walking trolleys to move in groups after demoulding.

[0009] In a preferred embodiment, a hydraulic adjustment system is also installed above the frame, and the hydraulic adjustment system includes a slide, a lateral adjustment cylinder and a vertical adjustment cylinder, wherein the slide and the lateral adjustment cylinder are both located above the central crossbeam, the output end piston rod of the lateral adjustment cylinder extends to the middle of the slide and is connected to the slide through a pin hole, so that the slide slides above the frame crossbeam, and the vertical adjustment cylinder is vertically installed above the slide.

[0010] In a preferred embodiment, the hydraulic adjustment system further comprises a small hydraulic station, which is driven by a motor to supply pressure to the vertical adjustment cylinder and the lateral adjustment cylinder.

[0011] In a preferred embodiment, the number of the vertical adjustment cylinders is set to two, and the two vertical adjustment cylinders are respectively located above the two ends of the slide seat and fixed.

[0012] In a preferred embodiment, a box girder bottom formwork is arranged between two box girder outer formworks in symmetrical positions for connection, a top tie rod and a bottom tie rod are respectively arranged above and below the box girder bottom formwork, a tie rod seat is arranged at the position of the box girder outer formwork corresponding to the bottom tie rod, two ends of the top tie rod are respectively connected to the top end of the box girder outer formwork, and two ends of the bottom tie rod are respectively connected and fixed to the bottom end of the box girder outer formwork through the tie rod seat.

[0013] In a preferred embodiment, the outer formwork of the box girder includes an outer formwork panel, a keel, an operating platform, and a support frame. The keel is bent to fit the shape of the outer formwork panel to support the outer formwork panel. The pin hole at the bottom of the support frame is aligned with the pin hole of the vertical adjustment cylinder, and then a pin shaft and an elastic pin are inserted to connect them. One side of the support frame is fitted to the shape of the keel to support the keel, and an operating platform is installed on the top of the other side of the support frame.

[0014] A construction method for the outer side formwork of a railway support cast-in-place box girder, using the outer side formwork of a railway support cast-in-place box girder as described in any one of the above items for assembly, the specific operation steps are as follows: Step S: track laying: a set of running tracks is laid on the cast-in-place box girder support along the longitudinal direction, fixed to the support distribution beam by U-shaped bolts, and horizontally connected by track flat-joint channel steel in the middle, and the two sets of running tracks are arranged symmetrically with the longitudinal center line of the box girder; Step S: Install the electric control walking system. Each walking trolley consists of two driving wheels and corresponding walking motors, two driven wheels, a frame, a power distribution cabinet and a controller. Six walking trolleys are set to support several box beam outer templates on one side. Twelve walking trolleys are set for multiple box beam outer templates on both sides. During installation, they need to be transported to the I-beam track by a car crane according to the preset position, and then each walking trolley on one side is organized into a group. Each group is connected to a distribution box to control the walking trolley to demould the box beam outer template and then walk in sections; Step S: Installation of hydraulic adjustment system. To ensure the calibration accuracy of the outer template of the box girder, each trolley is synchronously installed with a hydraulic adjustment system. The hydraulic adjustment system consists of a transverse adjustment cylinder and a slide, two vertical adjustment cylinders, a small hydraulic station and a controller. The vertical adjustment cylinder is vertically installed on the top surface of the middle crossbeam of the trolley, and the transverse adjustment cylinder is transversely installed above the middle crossbeam of the trolley. The end of the piston of the vertical adjustment cylinder is conveniently pinned with the support frame. The small hydraulic station is installed on the support frame, and the motor drives the vertical adjustment cylinder and the transverse adjustment cylinder to supply pressure. Step S: Installation and calibration of the outer formwork of the box beam. The outer formwork of the box beam consists of an outer formwork panel, a keel, a support frame, and an operating platform. When installing for the first time, first align the pin hole of the support frame with the pin hole of the vertical adjustment cylinder, insert the pin shaft and the elastic pin, and then splice other outer formworks of the box beam in turn through bolts, and adjust the bottom rod seat at the bottom and tighten the top tie rod and the bottom tie rod. Finally, start the small hydraulic station for the vertical adjustment cylinder and the lateral adjustment cylinder to achieve precise positioning of the horizontal distance and vertical distance of the outer formwork of the box beam; Step S: Hydraulic demoulding: After the box beam is poured and the steel bar wire is pre-tensioned, it can be demoulded. Before demoulding, the top and bottom tie rods of the outer template of the box beam need to be loosened, the tie rod seat needs to be turned up and fixed with screws, and it needs to be confirmed that there are no obstacles to demoulding. When demoulding, the vertical adjustment cylinders on the inner and outer sides are remotely controlled to retract alternately to ensure the stability of the center of gravity of the outer template of the box beam. When the outer template of the box beam is dropped to a certain height, the horizontal adjustment cylinder is controlled to retract, and the template can be successfully removed. Step S: For the outer formwork of the box girder, a single power distribution cabinet controls three trolleys, and the outer formwork of the box girder on one side is moved to the next span formwork position in two times; first disconnect the control lines of the three trolleys that move later from the hydraulic control cabinet, and after confirming that there are no foreign objects blocking the walking track, the three trolleys that move earlier can be remotely controlled to drive a group of outer formworks of the box girder to move forward to the next span formwork position, and then use the same method to drive the remaining outer formworks of the box girder to move into place with the three trolleys that move later; finally, reconnect the control line with the hydraulic control cabinet, adjust the outer formwork of the box girder, and construct the next span.

[0015] Technical effects and advantages of the present invention: By setting up the outer template of the box beam composed of a support frame, an electric control running system, a hydraulic control system, and an operating platform, compared with the existing technology, after the hydraulic demoulding of the first hole beam of the working surface, the outer template can be driven by a motor and quickly move along the track installed on the bracket to the next hole bracket for precise alignment, and then the horizontal position and elevation of the template can be accurately calibrated by using a hydraulic cylinder; The outer mold electronically controlled travel technology eliminates the need for frequent lifting and reversing of the template, and enables efficient flow operation of the cast-in-place box girder on the bracket. The hydraulic mold adjustment technology is applied to the key process of cast-in-place box girder construction, eliminating the backward process of manually adjusting the outer mold piece by piece, greatly improving the construction quality and efficiency; The continuous walking operation of the external side formwork on the bracket eliminates the need for a car crane to install and remove the formwork and transport it backwards, greatly reducing the safety risk of construction and achieving significant economic benefits. By reducing the frequency of construction using truck cranes occupying the road, there is no need to reserve a template transfer site under the bridge. This makes it particularly suitable for the construction of large-scale continuous support cast-in-place box girders, significantly improving construction site utilization and construction organization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a schematic diagram of the structure of installing the outer side formwork of the box beam on the cast-in-place box beam support.

[0017] Figure 2 For the present invention Figure 1 Schematic diagram of some structures in .

[0018] Figure 3 For the present invention Figure 2 A magnified view of the structure in the middle.

[0019] Figure 4 This is a schematic structural diagram of the cast-in-place box girder support proposed in the present invention.

[0020] Figure 5 This is a schematic diagram of the structure of the walking track proposed by the present invention.

[0021] Figure 6This is a front structural schematic diagram of the hydraulic adjustment system of the traveling trolley proposed in the present invention.

[0022] Figure 7 This is a side structural schematic diagram of the hydraulic adjustment system of the traveling trolley proposed in the present invention.

[0023] Figure 8 It is a structural schematic diagram of the hydraulic adjustment system of the walking trolley machine in the present invention when viewed from an upward angle.

[0024] Fig. 9 The present invention is a schematic structural diagram of the assembly of the outer formwork of the box beam and the bottom formwork of the box beam.

[0025] Fig.10 This is a schematic structural diagram of the outer side formwork of the box girder proposed in the present invention.

[0026] The reference numerals are: 1. cast-in-place box beam support; 2. walking trolley; 3. hydraulic adjustment system; 4. outer formwork of box beam; 5. bottom formwork of box beam; 6. top tie rod; 7. bottom tie rod; 8. tie rod seat; 11. Bracket distribution beam; 12. Walking track; 13. Track parallel channel steel; 121. I-beam rail; 122. rail longitudinal connecting plate; 123. U-shaped bolt; 124. flat joint interface; 21. Frame; 22. Driving wheel; 23. Driven wheel; 24. Travel motor; 211, longitudinal bar; 212, center crossbeam; 31. Sliding seat; 32. Horizontal adjustment cylinder; 33. Vertical adjustment cylinder; 34. Small hydraulic station; 41. Outer formwork panel; 42. Keel; 43. Operating platform; 44. Support frame. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0028] As attached Figure 1-10 The shown assembly of the outer side formwork of a cast-in-place box girder of a railway support specifically includes a cast-in-place box girder support 1 and two sets of walking systems. The outer side formwork 4 of the cast-in-place box girder of the railway support is assembled and constructed by combining the electric-controlled walking system and the hydraulic mold correction, wherein: The cast-in-place box girder support 1 is laid along the track where the piers are distributed, and a number of support distribution beams 11 are installed above the support 1 and are equidistantly laid along the track. Two groups of walking tracks 12 are distributed above the cast-in-place box girder support 1. The two groups of walking tracks 12 are symmetrically distributed on both sides of the cast-in-place box girder support 1 and maintain a vertical angle with the support distribution beam 11. Each group of walking tracks 12 is composed of two single tracks in parallel and a track flat-joint channel steel 13 is set in the middle for connection, so that the two single tracks are assembled into an integral walking track 12, which is convenient for the walking system to carry the outer template 4 of the cast-in-place box girder to the designated position along the walking track 12 and connect and fix it to the bottom template 5 of the box girder to complete the assembly process; There are two groups of walking systems, and the two groups of walking systems are respectively composed of a number of walking trolleys 2 symmetrically distributed along two groups of walking tracks 12. Specifically in this embodiment, each group of walking systems includes six walking trolleys 2, and every three walking trolleys 2 are grouped into a group, which are connected to a distribution box to control the group movement of the walking trolleys 2 after demoulding, and each walking trolley 2 is evenly distributed, and the two sides of the bottom of each walking trolley 2 are respectively clamped on the two single tracks of the walking track 12, and the top of each walking trolley 2 supports three box girder outer templates 4.

[0029] Please refer to the instruction manual Figure 5 , the single track in this embodiment is specifically described: the single track is assembled by connecting a plurality of I-beam rails 121 laid on the top of the cast-in-place box beam support 1 in sequence, and a track longitudinal connecting plate 122 is arranged between two adjacent I-beam rails 121 for fixing, each I-beam rail 121 is overlapped above the end of the support distribution beam 11, and an inverted U-shaped bolt 123 is arranged to fix the I-beam rail 121 and the support distribution beam 11, and a flat connection interface 124 is arranged at the position of each I-beam rail 121 corresponding to the track flat connection channel steel 13, and the two parallel I-beam rails 121 are connected and fixed to the track flat connection channel steel 13 in the middle through the flat connection interface 124; The assembly of the entire single track is completed by connecting multiple I-beam rails 121 in sequence, and the track flat channel steel 13 is used to improve the firmness of the connection between the I-beam rails 121 at the corresponding positions of the two single tracks, and the I-beam rails 121 and the support distribution beam 11 are further fixed to improve the firmness of the single track on the outer side of the cast-in-place box beam of the railway support. This two-pronged approach improves the stability of the track when it is in use.

[0030] Please refer to the instruction manual Figure 6-8, the walking trolley 2 in this embodiment is specifically described: the walking trolley 2 includes a frame 21 in a transverse I-shaped shape, the frame 21 is composed of two longitudinal rods 211 arranged along the I-shaped steel rail 121 and a central crossbeam 212, the front and rear ends of the longitudinal rod 211 are respectively installed with a driving wheel 22 and a driven wheel 23, the longitudinal rod 211 is located at a position on one side of the driving wheel 22, and a walking motor 24 is arranged to drive the driving wheel 22. In this embodiment, the walking motor 24 has a rated power of 1.5KW and is equipped with a corresponding reducer structure, which is a prior art, so it will not be described in detail here; The driving wheel 22 is driven by the travel motor 24 to move along the single track in the working direction, and the frame 21 is driven to move along the working direction with the cooperation of the driven wheel 23. Since the box girder outer formwork 4 is supported on the travel trolley 2, the travel trolley 2 moves along the working direction to drive the box girder outer formwork 4 to move to the specified position, and finally the assembly process is completed through demolding.

[0031] Please refer to the instruction manual Figure 6-8 , the walking trolley 2 in this embodiment is further described as follows: a hydraulic adjustment system 3 is also installed above the frame 21, and the hydraulic adjustment system 3 includes a slide 31, a lateral adjustment cylinder 32 and a vertical adjustment cylinder 33, wherein the slide 31 and the lateral adjustment cylinder 32 are both located above the middle crossbeam 212, the output end piston rod of the lateral adjustment cylinder 32 extends to the middle of the slide 31 and is connected to the slide 31 through a pin hole, so that the slide 31 slides above the crossbeam of the frame 21, and the number of the vertical adjustment cylinders 33 is set to two, and the two vertical adjustment cylinders 33 are respectively located above the two ends of the slide 31 and fixed; The piston rod at the output end of the lateral adjustment cylinder 32 drives the slide 31 to move above the central crossbeam 212, thereby adjusting the position of the outer side template 4 of the box beam in the horizontal direction. The piston rod at the output end of the vertical adjustment cylinder 33 drives the outer side template 4 of the box beam to adjust the position in the vertical direction. The specific process is described below, and combined with the longitudinal distance adjusted by the walking trolley 2 on the walking track 12, the triple adjustment is used to complete the precise adjustment of the position of the outer side template 4 of the box beam.

[0032] Please refer to the instruction manual Figure 6-8 and Fig.10 , the hydraulic adjustment system 3 in this embodiment is further explained: the hydraulic adjustment system 3 also includes a small hydraulic station 34, which is driven by a motor to supply pressure to the vertical adjustment cylinder 33 and the lateral adjustment cylinder 32 to ensure that the vertical adjustment cylinder 33 and the lateral adjustment cylinder 32 work stably, and the small hydraulic station 34 can be installed above the support frame 44 to reduce the volume of the overall equipment. This is a prior art, so it will not be described in detail here.

[0033] Please refer to the instruction manual Figure 9-10, the installation process of the box beam outer formwork 4 on both sides of the present embodiment is specifically described: a box beam bottom formwork 5 is arranged between the two box beam outer formworks 4 in symmetrical positions for connection, a top tie rod 6 and a bottom tie rod 7 are arranged above and below the box beam bottom formwork 5, and a tie rod seat 8 is arranged at the position of the box beam outer formwork 4 corresponding to the bottom tie rod 7, the two ends of the top tie rod 6 are respectively connected to the top end of the box beam outer formwork 4, and the two ends of the bottom tie rod 7 are respectively connected and fixed to the bottom end of the box beam outer formwork 4 through the tie rod seat 8; After the corresponding supported box girder outer formwork 4 is moved to the working position by two sets of walking trolleys 2 on the walking tracks 12 on both sides, the precise position is adjusted by the hydraulic adjustment system 3, and then the precisely positioned box girder outer formwork 4 and the box girder bottom formwork 5 are assembled under the joint action of the top tie rod 6 and the bottom tie rod 7. After the assembly is completed, the top tie rod 6 and the bottom tie rod 7 are loosened, the tie rod seat 8 is flipped up and fixed with screws, and demolding is carried out after confirming that there are no obstacles to demolding.

[0034] Please refer to the instruction manual Fig.10 , the outer formwork 4 of the box beam in this embodiment is specifically described: the outer formwork 4 of the box beam includes an outer formwork panel 41, a keel 42, an operating platform 43, and a support frame 44. The keel 42 is bent to fit the shape of the outer formwork panel 41 to support the outer formwork panel 41. The pin hole at the bottom of the support frame 44 is aligned with the pin hole of the vertical adjustment cylinder 33, and then the pin shaft and the elastic pin are inserted to connect. One side of the support frame 44 is fitted to the shape of the keel 42 to support the keel 42, and the operating platform 43 is installed on the top of the other side of the support frame 44; The vertical adjustment cylinder 33 adjusts the height of the support frame 44, and further adjusts the height of the box girder outer formwork 4, so as to facilitate the assembly of the box girder outer formwork 4 and the box girder bottom formwork 5, and also facilitate the subsequent retraction for demoulding. The operating platform 43 is convenient for the staff to stand on it for operation. The keel 42 is used to support the box girder outer formwork 4 to prevent the box girder outer formwork 4 from deformation and damage during transportation. Example

[0035] This embodiment provides a construction method for the outer side formwork of a railway support cast-in-place box girder, using a railway support cast-in-place box girder outer side formwork assembly as provided in Example 1, and the specific operation steps are as follows: Step S1: track laying, a group of running tracks 12, specifically 16# I-beams, are laid longitudinally on the brackets outside the contour lines on both sides of the box beam, i.e., the cast-in-place box beam brackets 1, and fixed to the bracket distribution beam 11 by U-shaped bolts 123. The gauge of the two single tracks in each group of running tracks 12 is 245cm, and the middle is cross-connected by a track flat-joint channel steel 13, which is specifically 10# channel steel, and is evenly distributed along the running tracks 12 at a spacing of 200cm. The two groups of running tracks 12 are symmetrically arranged about the longitudinal center line of the box beam, and the center distance is 872cm; Step S2: Install the electric-controlled walking system. Each walking trolley 2 consists of two driving wheels 22, including a 1.5KW walking motor 24, a reducer structure, two driven wheels 23, a frame 21, a power distribution cabinet and a controller. Six walking trolleys 2 are set to support several box girder outer templates 4 on one side, and twelve walking trolleys 2 are set for multiple box girder outer templates 4 on both sides. During installation, they need to be transported to the I-beam track 121 by a car crane according to the preset position, and then every three walking trolleys 2 on one side are grouped into a group, and each group is connected to a distribution box to control the walking trolley 2 to demould the box girder outer template 4 and then walk in sections; Step S3: Installation of the hydraulic adjustment system 3. To ensure the calibration accuracy of the outer template 4 of the box beam, each trolley 2 is synchronously installed with a hydraulic adjustment system 3; wherein the hydraulic adjustment system 3 is composed of a transverse adjustment cylinder 32 and a slide 31, two vertical adjustment cylinders 33, a small hydraulic station 34 and a controller, wherein the vertical adjustment cylinder 33 is vertically installed on the top surface of the middle crossbeam 212 of the trolley 2, and the transverse adjustment cylinder 32 is transversely installed above the middle crossbeam 212 of the trolley 2. A φ38mm pin hole is provided at the end of the piston of the vertical adjustment cylinder 33 to facilitate pin connection with the support frame 44. The small hydraulic station 34 is installed on the support frame 44, and the vertical adjustment cylinder 33 and the transverse adjustment cylinder 32 are supplied with pressure by a motor drive; Step S4: installing and calibrating the outer formwork 4 of the box beam. The outer formwork 4 of the box beam is composed of an outer formwork panel 41, a keel 42, a support frame 44, and an operating platform 43. The standard length is 400 cm, and an adjustment template is configured to adapt to different box beam lengths. When installing for the first time, first align the pin hole of the support frame 44 with the pin hole of the vertical adjustment cylinder 33, insert the φ36mm pin shaft and the elastic pin, and then splice other outer formworks of the box beam 4 in turn through bolts, and adjust the bottom rod seat at the bottom and tighten the top tie rod 6 and the bottom tie rod 7. Finally, start the small hydraulic station 34 to realize the precise positioning of the horizontal distance and vertical distance of the outer formwork 4 of the box beam for the vertical adjustment cylinder 33 and the lateral adjustment cylinder 32; Step S5: Hydraulic demoulding: after the box beam is cast and the steel bar wire is pre-tensioned, it can be demoulded; before demoulding, the top tie rod 6 and the bottom tie rod 7 of the outer template 4 of the box beam need to be loosened, the tie rod seat 8 needs to be turned up and fixed with screws, and it is confirmed that there is no obstacle to demoulding; when demoulding, the inner and outer vertical adjustment cylinders 33 are remotely controlled to retract alternately to ensure the stability of the center of gravity of the outer template 4 of the box beam. When the outer template 4 of the box beam is dropped to a certain height, the horizontal adjustment cylinder 32 is controlled to retract, and the template can be successfully removed; Step S6: For the outer formwork 4 of the box girder, a single power distribution cabinet controls three traveling trolleys 2, and the outer formwork 4 of the box girder on one side is moved to the next span formwork position twice; first disconnect the control lines of the three traveling trolleys 2 that are moving later from the hydraulic control cabinet, and after confirming that there is no foreign object blocking the walking track 12, the three traveling trolleys 2 that are moving earlier can be remotely controlled to drive a group of outer formworks of the box girder 4 to move forward to the next span formwork position, and then use the same method to drive the remaining outer formworks of the box girder 4 to move into place with the three traveling trolleys that are moving later; finally, reconnect the control line with the hydraulic control cabinet, adjust the outer formwork 4 of the box girder, and construct the next span.

[0036] The travel motor 24, controller, power distribution cabinet, hydraulic control cabinet, and small hydraulic station 34 involved in Examples 1-2 all adopt conventional technical means in the prior art, and their supporting hydraulic adjustment system 3, solenoid valves, and pipelines can also be provided by the manufacturer. In addition, the circuits, electronic components, and modules involved in the present invention are all prior art, which can be fully implemented by those skilled in the art. Needless to say, the content protected by the present invention does not involve improvements to the internal structure and methods.

[0037] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change; Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other; Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A railway support cast-in-place box girder outer formwork assembly, characterized in that: include: A cast-in-place box girder support (1) is laid along a track distributed along the bridge piers, and a plurality of support distribution beams (11) are installed above the support and are laid equidistantly along the track. Two groups of running tracks (12) are distributed above the cast-in-place box girder support (1). The two groups of running tracks (12) are symmetrically distributed on both sides of the cast-in-place box girder support (1) and maintain a vertical angle with the support distribution beam (11). Each group of running tracks (12) is composed of two single tracks arranged in parallel and a track flat-joint channel steel (13) is arranged in the middle for connection; The two groups of walking systems are respectively composed of a plurality of walking trolleys (2) symmetrically distributed along the two groups of walking tracks (12), each of the walking trolleys (2) being evenly distributed, and the bottom two sides of each walking trolley (2) are respectively clamped on two single tracks of the walking track (12), and the top of each walking trolley (2) supports a plurality of box beam outer side templates (4).

2. The outer side formwork assembly of a railway support cast-in-place box girder according to claim 1, characterized in that: The single track is assembled by sequentially connecting a plurality of I-beam rails (121) laid on top of a cast-in-place box beam support (1); a track longitudinal connecting plate (122) is arranged between two adjacent I-beam rails (121) for fixing; each of the I-beam rails (121) is overlapped above the end of a support distribution beam (11); an inverted U-shaped bolt (123) is arranged to fix the I-beam rail (121) and the support distribution beam (11); a parallel connection interface (124) is arranged at a position corresponding to a track parallel connection channel steel (13) of each I-beam rail (121); and the two parallel I-beam rails (121) are connected and fixed to the track parallel connection channel steel (13) in the middle through the parallel connection interface (124).

3. A railway support cast-in-place box girder outer formwork assembly according to any one of claims 1-2, characterized in that: The walking trolley (2) comprises a frame (21) in a transverse I-shaped configuration, the frame (21) comprising two longitudinal rods (211) arranged along an I-shaped steel rail (121) and a central crossbeam (212), a driving wheel (22) and a driven wheel (23) being respectively mounted at the front and rear ends of the longitudinal rod (211), and a walking motor (24) is arranged at a position of the longitudinal rod (211) on one side of the driving wheel (22) to drive the driving wheel (22).

4. The outer side formwork assembly of a railway support cast-in-place box girder according to claim 3 is characterized by: Each group of walking systems includes six walking trolleys (2), and three walking trolleys (2) are grouped together and connected to a distribution box to control the walking trolleys (2) to move in groups after demoulding.

5. The outer side formwork assembly of a railway support cast-in-place box girder according to claim 3 is characterized by: A hydraulic adjustment system (3) is also installed above the vehicle frame (21), and the hydraulic adjustment system (3) comprises a slide seat (31), a lateral adjustment cylinder (32), and a vertical adjustment cylinder (33), wherein the slide seat (31) and the lateral adjustment cylinder (32) are both located above the central crossbeam (212), the output end piston rod of the lateral adjustment cylinder (32) extends to the middle of the slide seat (31) and is connected to the slide seat (31) through a pin hole, so that the slide seat (31) slides above the crossbeam of the vehicle frame (21), and the vertical adjustment cylinder (33) is installed vertically above the slide seat (31).

6. The outer side formwork assembly of a railway support cast-in-place box girder according to claim 5, characterized in that: The hydraulic adjustment system (3) further comprises a small hydraulic station (34), which is driven by a motor to supply pressure to the vertical adjustment cylinder (33) and the horizontal adjustment cylinder (32).

7. The outer side formwork assembly of a railway support cast-in-place box girder according to claim 5, characterized in that: The number of the vertical adjustment oil cylinders (33) is set to two, and the two vertical adjustment oil cylinders (33) are respectively located above the two ends of the slide seat (31) and are fixed.

8. The outer side formwork assembly of a railway support cast-in-place box girder according to claim 1, characterized in that: A box girder bottom formwork (5) is arranged between two box girder outer formworks (4) at symmetrical positions for connection; a top tie rod (6) and a bottom tie rod (7) are arranged above and below the box girder bottom formwork (5), respectively; a tie rod seat (8) is arranged at a position of the box girder outer formwork (4) corresponding to the bottom tie rod (7); two ends of the top tie rod (6) are respectively connected to the top end of the box girder outer formwork (4); and two ends of the bottom tie rod (7) are respectively connected and fixed to the bottom end of the box girder outer formwork (4) via the tie rod seat (8).

9. The outer side formwork assembly of a railway support cast-in-place box girder according to claim 8, characterized in that: The outer formwork (4) of the box beam comprises an outer formwork panel (41), a keel (42), an operating platform (43), and a support frame (44); the keel (42) is bent and arranged to fit the shape of the outer formwork panel (41) so as to support the outer formwork panel (41); a pin hole at the bottom end of the support frame (44) is aligned with a pin hole of a vertical adjustment cylinder (33) and then a pin shaft and an elastic pin are inserted to connect them; one side of the support frame (44) is arranged to fit the shape of the keel (42) so as to support the keel (42); and an operating platform (43) is installed at the top end of the other side of the support frame (44).

10. A construction method for the outer formwork of a railway support cast-in-place box girder, using the outer formwork assembly of a railway support cast-in-place box girder according to any one of claims 1 to 9, characterized in that: The specific steps are as follows: Step S1: track laying, laying a set of running tracks (12) on the cast-in-place box beam support (1) along the longitudinal direction, fixing them to the support distribution beam (11) by U-shaped bolts (123), and connecting them horizontally with a track flat channel steel (13) in the middle, and the two sets of running tracks (12) are arranged symmetrically about the longitudinal center line of the box beam; Step S2: installing an electric-controlled walking system, wherein each walking trolley (2) is composed of two driving wheels (22) and corresponding walking motors (24), two driven wheels (23), a frame (21), a power distribution cabinet and a controller. Six walking trolleys (2) are provided to support a plurality of box beam outer templates (4) on one side, and twelve walking trolleys (2) are provided to support a plurality of box beam outer templates (4) on both sides. During installation, the trolleys (2) are hoisted onto the I-beam rail (121) according to a preset position by a car crane, and then three walking trolleys (2) on one side are grouped into a group, and each group is connected to a power distribution box to control the walking trolley (2) to demould the box beam outer template (4) and then travel in sections; Step S3: installing a hydraulic adjustment system (3). To ensure the calibration accuracy of the outer template (4) of the box beam, each trolley (2) is simultaneously installed with a hydraulic adjustment system (3); wherein the hydraulic adjustment system (3) is composed of a transverse adjustment cylinder (32) and a slide seat (31), two vertical adjustment cylinders (33), a small hydraulic station (34) and a controller, wherein the vertical adjustment cylinder (33) is vertically installed on the top surface of the middle crossbeam (212) of the trolley (2), and the transverse adjustment cylinder (32) is transversely installed above the middle crossbeam (212) of the trolley (2). The piston end of the vertical adjustment cylinder (33) is conveniently pinned to the support frame (44). The small hydraulic station (34) is installed on the support frame (44) and is driven by a motor to supply pressure to the vertical adjustment cylinder (33) and the transverse adjustment cylinder (32); Step S4: installing and calibrating the outer formwork (4) of the box beam. The outer formwork (4) of the box beam is composed of an outer formwork panel (41), a keel (42), a support frame (44), and an operating platform (43). When installing for the first time, first align the pin hole of the support frame (44) with the pin hole of the vertical adjustment cylinder (33), insert the pin shaft and the elastic pin, and then splice other outer formworks (4) of the box beam in turn by bolts, and adjust the bottom rod seat at the bottom and tighten the top tie rod (6) and the bottom tie rod (7). Finally, start the small hydraulic station (34) for the vertical adjustment cylinder (33) and the lateral adjustment cylinder (32) to achieve accurate positioning of the horizontal distance and vertical distance of the outer formwork (4) of the box beam; Step S5: Hydraulic demoulding. After the box beam is cast and the steel bar wire is pre-tensioned, demoulding can be performed. Before demoulding, the top tie rod (6) and the bottom tie rod (7) of the outer template (4) of the box beam need to be loosened, the tie rod seat (8) needs to be turned up and fixed with screws, and it is confirmed that there are no obstacles to demoulding. When demoulding, the inner and outer vertical adjustment cylinders (33) are remotely controlled to retract alternately to ensure the stability of the center of gravity of the outer template (4) of the box beam. When the outer template (4) of the box beam is dropped to a certain height, the horizontal adjustment cylinder (32) is controlled to retract, and the template can be successfully removed. Step S6: The outer formwork of the box girder (4), a single power distribution cabinet controls three traveling trolleys (2), and the outer formwork of the box girder (4) on one side is moved to the next span formwork position in two steps; first, the control lines of the three traveling trolleys (2) that are moving later are disconnected from the hydraulic control cabinet, and after confirming that there is no foreign object blocking the walking track (12), the three traveling trolleys (2) that are moving earlier can be remotely controlled to drive a group of the outer formwork of the box girder (4) to move forward to the next span formwork position, and then the same method is used to drive the remaining outer formwork of the box girder (4) to move into place with the three traveling trolleys that are moving later; finally, the control line is reconnected to the hydraulic control cabinet, the outer formwork of the box girder (4) is adjusted, and the next span is constructed.

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