Construction method of adjustable trolley formwork

Abstract

This invention provides a construction method for an adjustable trolley formwork, addressing the problems of poor adjustability of existing trolley formwork systems, non-adjustable support frames, and inconvenient movement. The steps are as follows: The adjustable trolley formwork is placed in the first construction section of the box culvert structure to be poured. The wall support lift extends and supports the already poured box culvert wall. The bottom lift extends to raise the top formwork assembly to the designed height. The corner formwork lift extends to push the corner formwork panel to assemble with the top formwork assembly. The side formwork lift extends to push the side formwork assembly out and assemble with the corner formwork panel. After the current construction section is completed, the wall support lift is retracted. The side formwork lift, corner formwork lift, and bottom lift are then retracted sequentially, so that the rollers of the support frame are supported by the traveling device. The bottom lift is then retracted, allowing the dismantled formwork system to move with the traveling device to the next construction section of the box culvert structure to be poured. This process is repeated until the concrete pouring of the box culvert structure is completed section by section.

Description

Technical Field

[0001] This invention relates to the field of construction equipment technology, and in particular to a construction method for adjustable trolley formwork. Background Technology

[0002] Currently, in the construction of various box culverts, pipe corridors, tunnels and other structures, traditional trolley formwork is usually used for on-site concrete pouring. Traditional trolley formwork is generally a steel formwork rail trolley formwork or a simple steel formwork trolley formwork. Traditional trolley formwork has defects such as poor formwork system adjustment capability, non-adjustable support frame size, and inconvenient trolley formwork movement. This results in large deviations in the concrete structure pouring size, poor adaptability to culverts with different cross-sectional sizes, and low trolley formwork movement efficiency. Summary of the Invention

[0003] The present invention addresses the problems of existing trolley formwork systems, such as poor adjustability of the formwork system, non-adjustable support frame dimensions, and inconvenient movement of the trolley formwork. The purpose of this invention is to provide a construction method for adjustable trolley formwork.

[0004] The technical solution adopted by this invention to solve its technical problem is: a construction method for an adjustable trolley formwork, the specific steps of which are as follows:

[0005] S21: After the concrete pouring of the pre-cast box culvert structure is completed and the concrete meets the design strength requirements, the assembled support frame and formwork system are placed in the first construction section of the box culvert structure to be poured. The formwork system includes top formwork components, corner formwork panels, and side formwork components. The support frame includes support gantry frames, adjustable horizontal beams, adjustable cantilever beams, corner formwork lifts, side formwork lifts, wall support lifts, and bottom lifts. The support gantry frames are rectangular frames connected by two vertically and horizontally spaced columns and two horizontal beams. The two support gantry frames are vertically spaced, and multiple adjustable horizontal beams are horizontally arranged and bolted together. The frame is formed by connecting two supporting gantry frames. At least two adjustable cantilever beams are installed on the top beam of each supporting gantry frame. The other end of the adjustable cantilever beam is detachably connected to the side formwork assembly. At least two pairs of side formwork lifters and one pair of wall support lifters are symmetrically installed on the two columns of each supporting gantry frame. The other end of the side formwork lifter is detachably connected to the side formwork assembly. Multiple corner formwork lifters are symmetrically arranged at both ends of the top formwork assembly along its axis. One end of the corner formwork lifter is hinged to the edge of the top formwork assembly, and the other end is connected to the corner formwork panel pin. A bottom lifter is connected to the bottom of each column of the supporting gantry frame.

[0006] S22: After the support frame and formwork system are in place, control the bottom lift to extend and support the bottom plate, and at the same time lift the top formwork assembly to the design height. Control the wall support lifts on both sides of the support frame to extend and abut against the walls of the already poured box culvert structure. Control the corner formwork lift to extend and push the corner formwork panel out and assemble it with the top formwork assembly. Then control the side formwork lift to extend and push the side formwork assembly out. Use the adjustable cantilever beam to drive the side formwork assembly to make fine adjustments to its position so that the side formwork assembly is assembled with the corner formwork panel. Check and adjust the width and height of the support frame and formwork system until they meet the construction requirements.

[0007] S23: Tie the reinforcing bars of the walls and top slab of the box culvert structure to be cast, install the external side formwork and end formwork, and reinforce them with tie rods and side formwork components. Pour the concrete for the walls and top slab. After the concrete reaches the design strength, control the wall support elevator to retract and separate from the walls of the cast box culvert structure; control the side formwork elevator to retract and drive the side formwork components to retract and separate from the walls; then control the screw of the corner formwork elevator to retract and drive the corner formwork panel to retract and separate from the corner of the box culvert, thus realizing the formwork system opening construction.

[0008] S24: After the current construction section of the box culvert structure to be cast is completed, the rollers of the support frame are supported by the traveling device, and the bottom elevator is controlled to retract, so that the formwork system and support frame after demolding are moved with the traveling device to the next construction section of the box culvert structure to be cast.

[0009] S25: Repeat steps S22 to S24 until the concrete pouring construction of the box culvert structure to be poured is completed segment by segment.

[0010] The construction method of the adjustable trolley formwork frame of the present invention involves placing the assembled support frame and formwork system in the first construction section of the box culvert structure to be poured. The wall support elevator extends and supports the wall of the already poured box culvert structure. The bottom elevator is controlled to extend and lift the top formwork assembly to the designed height. The corner formwork elevator is controlled to extend and push the corner formwork panel to assemble with the top formwork assembly. The side formwork elevator is controlled to extend and push the side formwork assembly out and assemble with the corner formwork panel. The formwork system is assembled in the order of first assembling the top formwork assembly, then the corner formwork panel, and finally the side formwork assembly. After the construction of the wall and top slab of the current construction section of the box culvert structure is completed, the wall support elevator is controlled to retract and move away from the wall. The side formwork elevator, corner formwork elevator, and bottom elevator are controlled to retract in sequence. The side formwork assembly is opened, then the corner formwork panel is opened, and finally the top formwork assembly is opened to complete the formwork system opening construction. The disassembled formwork system and support frame are moved to the next construction section of the box culvert structure to be poured with the traveling device. This process is repeated until the concrete pouring construction of the box culvert structure to be poured is completed section by section. This construction method utilizes overlapping steel panels at the joints of the top formwork components, corner formwork panels, and side formwork components to achieve seamless splicing, preventing grout leakage during concrete pouring and thus ensuring the quality of the concrete. It also employs multi-angle telescopic adjustable components on the support frame for detachable connection with the formwork system, enabling automated adjustment of the formwork system's width and height, as well as automated closing and dismantling of each formwork component. This method boasts a high degree of automation, high equipment turnover efficiency, and safe and efficient overall movement, thereby improving the level of industrialized construction, enhancing construction efficiency and quality, and ensuring construction safety.

[0011] Furthermore, the adjustable horizontal beam includes a first horizontal beam made of I-beams and a second horizontal beam made of two channel steels spaced apart and opposite to each other. The web of the first horizontal beam is adapted to the gap between the two channel steels of the second horizontal beam, so that the first horizontal beam can be fitted into the gap of the second horizontal beam and slide relative to each other. The web of both the first and second horizontal beams is provided with multiple bolt holes spaced apart. Positioning bolts pass through the bolt holes of the first and second horizontal beams and are locked and fixed. The other end of the first and second horizontal beams is vertically connected to a side plate with bolt holes. The side plates of the first and second horizontal beams are respectively bolted to the connecting rods of the two supporting portal frames.

[0012] In step S21, the extension length of the adjustable horizontal beam is determined according to the width of the box culvert structure to be cast. After adjusting the relative position of the first horizontal beam and the second horizontal beam to the required length for construction, the positioning bolts pass through the bolt holes of the first horizontal beam and the second horizontal beam and are locked and fixed.

[0013] Furthermore, each of the supporting gantry frames also includes two pairs of connecting rods, one pair of connecting rods, one pair of roller connecting rods, and one pair of rollers. The two pairs of connecting rods are respectively vertically fixed to the connection between the column and the beam. The end of the connecting rod near the box culvert structure to be cast is bolted to the side formwork lifting machine, and the other end of the connecting rod is bolted to the adjustable horizontal beam. The pair of connecting rods are respectively vertically fixed to the outer side of the bottom of the two columns. The end of the connecting rod is bolted to the wall support lifting machine. The bottom of the pair of connecting rods at the bottom is vertically connected to a pair of roller connecting rods. The connecting plate fixed to the bottom end of each roller connecting rod is bolted to the roller.

[0014] Furthermore, the adjustable cantilever beam includes a cantilever beam, a support bracket, and a lower support bracket. The support bracket includes a base, a sleeve connected to the base, and a first bearing connected to the bottom of the sleeve by a pin. One end of the cantilever beam passes through the sleeve and is supported by the first bearing. The lower support bracket includes a U-shaped support frame, an adjustable screw connected to the top of the support frame, a second bearing and a shaft pressure block located at the bottom of the adjustable screw and connected to the support frame by a pin. The other end of the cantilever beam passes through the support frame and is located at the bottom of the second bearing and the shaft pressure block. Both the support bracket and the lower support bracket are bolted to the cantilever beam support frame. The two ends of the cantilever beam are respectively provided with a pin hole one and a pin hole two. The pin hole one of the cantilever beam near the box culvert structure to be cast is connected to the second vertical back rib pin of the side formwork assembly. A stop block is installed in the pin hole two at the other end of the cantilever beam.

[0015] In steps S22 and S23, during the process of closing and disassembling the side formwork assembly, the adjustable screw rotates downward to push the second bearing and the axial pressure block to move along the Y-axis, so that the cantilever beam can support the side formwork assembly to rotate around the first bearing of the support in the XY plane to the installation position required for construction, thereby achieving fine adjustment of the installation position of the side formwork assembly.

[0016] Furthermore, each support gantry also includes a secondary crossbeam arranged parallel to a pair of crossbeams, and the support frame also includes a working platform mounted on top of the two secondary crossbeams.

[0017] Further, in step S21, the top mold assembly includes a top mold panel, multiple horizontal back ribs spaced apart at its bottom, and multiple back rib quick connectors. Each back rib quick connector consists of a U-shaped bending plate, a threaded rod penetrating the bending plate, and multiple nuts. One end of the threaded rod is rigidly connected to the nut, and the other end passes through the connection hole between the bending plate and the top mold panel and is locked in place by the nut. The horizontal back ribs are snapped into the hooks of the bending plate, allowing them to be vertically snapped into the bottom of the top mold panel. The side mold assembly includes a side mold panel, horizontal back ribs, a first vertical back rib, a second vertical back rib, and back rib quick connectors. Multiple horizontal back ribs are connected to one side of the side mold panel via the back rib quick connectors. The first vertical back ribs are vertically spaced and correspond to the positions of the two columns supporting the gantry. The first vertical back ribs are bolted to the second horizontal back rib. The two channel steels of the first vertical back ribs have corresponding elongated holes. The end of the screw of the side formwork lifting machine is embedded in the gap between the two channel steels. The pin passes through the elongated hole of the first vertical back rib and the screw of the side formwork lifting machine and is tightened. The two second vertical back ribs are vertically spaced and correspond to the positions of the two adjustable cantilever beams. The second vertical back ribs are bolted to the second horizontal back rib. The two channel steels of the second vertical back ribs have corresponding elongated holes. The end of the adjustable cantilever beam is embedded in the gap between the two channel steels. The pin passes through the elongated hole of the second vertical back rib and the end of the adjustable cantilever beam and is tightened.

[0018] Furthermore, in step S22, the corner mold frame of the corner mold panel is provided with a first connection hole and a second connection hole at both ends. The top surface of the corner mold frame near the first connection hole has a slot. The corner mold frame is connected to the top mold panel of the top mold assembly through the first connection hole. One end of the steel panel of the top mold panel can be snapped into the slot of the corner mold panel. The other end of the steel panel of the corner mold panel extends out of the corner mold frame as an extension end, which can be embedded into the slot at the end of the steel panel of the side mold panel. Multiple corner mold lifting machines are symmetrically arranged at both ends along the axis of the top mold assembly. One end of the corner mold lifting machine is hinged to the top mold. The component edge, with its other end connected to the corner mold panel pin, the corner mold lifting machine includes a lead screw, a connecting rod connected to one end of the lead screw, a screw drive device threaded to the other end of the lead screw, and an upper support fixed to the end of the screw drive device. The upper support is connected to the horizontal back rib of the top mold component pin. The connecting rod at the end of the lead screw is connected to its pin through the connecting hole two of the corner mold skeleton. The screw drive device is connected to the control system signal. Controlling the extension and retraction of the lead screw of the corner mold lifting machine drives the corner mold panel to rotate around the connecting hole one along the end of the top mold component, pushing the corner mold panel out and assembling it with the top mold component.

[0019] Furthermore, each of the supporting gantry frames also includes an adjusting screw vertically connected to the top of the column, and the adjusting screw is bolted to the top mold assembly;

[0020] Each support gantry column is also provided with a gantry bottom sleeve at the bottom. The gantry bottom sleeve is made of a vertically set cylinder and a base plate. The base plate is bolted to the bottom lift. The cylinder can be fitted inside the column, and multiple through holes are vertically spaced between the side wall of the cylinder and the bottom of the column. The gantry bottom sleeve is fitted to the bottom of the support gantry and connected by a pin through the through hole, so that the bottom lift can be detachably connected to the bottom of the support frame.

[0021] In step S22, the relative position between the cylinder of the bottom sleeve of the gantry and the column is adjusted to the required construction height, and the two are connected and fixed by a pin through the through hole. The bottom lift is controlled to extend and support the bottom plate of the cast-in-place box culvert structure. The extension and retraction length of the adjusting screw is adjusted to lift the top formwork assembly to the design height. Attached Figure Description

[0022] Figure 1 This is a perspective view of the adjustable trolley frame of the present invention installed inside a culvert;

[0023] Figure 2 This is a schematic diagram of the template system in one embodiment of the present invention;

[0024] Figure 3 for Figure 2 An enlarged view of part B;

[0025] Figure 4 This is a schematic diagram of the corner mold panel in one embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the top mold assembly in one embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of the quick-connect component with back ribs in one embodiment of the present invention;

[0028] Figure 7 for Figure 2 AA section view;

[0029] Figure 8 This is a perspective view of the support frame in the adjustable trolley mold frame of the present invention;

[0030] Figure 9 This is a perspective view of the supporting gantry in one embodiment of the present invention;

[0031] Figure 10 This is a perspective view of an adjustable cantilever beam according to an embodiment of the present invention;

[0032] Figure 11 This is a schematic diagram of the adjustable horizontal beam in one embodiment of the present invention;

[0033] Figure 12 for Figure 11CC section view;

[0034] Figure 13 This is a perspective view of the bottom sleeve of the gantry in one embodiment of the present invention;

[0035] Figure 14 This is a schematic diagram showing the dimensional relationships of the main components in an adjustable trolley mold frame according to an embodiment of the present invention;

[0036] Figure 15 and Figure 16 This is a schematic diagram of the construction method of the adjustable trolley formwork of the present invention.

[0037] The numbers in the diagram are as follows:

[0038] Box culvert structure 1 already poured; box culvert structure 2 to be poured;

[0039] Support frame 100; Support gantry 10; Column 11; Horizontal beam 12; Roller connecting rod 13; Secondary horizontal beam 14; Connecting rod one 15; Connecting rod two 16; Horizontal connecting rod 17; Adjustable horizontal beam 20; First horizontal beam 21; Second horizontal beam 23; Side plate 24; Adjusting screw 41; Side formwork lifting machine 42; Wall support lifting machine 43; Gantry bottom sleeve 45; Cylinder 451; Base plate 452; Bottom lifting machine 46; Roller 47; Angle formwork lifting machine 50; Screw 51; Connecting rod 52; Screw drive device 54; Upper support 55; Working platform 60;

[0040] Template system 200; Top formwork panel 211; Horizontal back rib 1 212; Back rib quick connector 213; Bending plate 213a; Screw 213b; Side formwork panel 224; Horizontal back rib 225; First vertical back rib 226; Second vertical back rib 227; Corner formwork frame 231; Steel panel of corner formwork panel 232; Slot 234; Connecting hole 1 235; Connecting hole 2 236; Extension end 237; Adjustable cantilever beam 30; Cantilever beam 31; Sleeve 32; Base 33; First bearing 34; Support frame 35; Adjustable screw 36; Second bearing 37; Pin hole 1 38; Pin hole 2 39. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clearly illustrate the embodiments of the present invention. For ease of description, the terms "upper" and "lower" used below are consistent with the upper and lower directions in the drawings, but this should not be construed as a limitation of the technical solution of the present invention.

[0042] This embodiment takes the concrete pouring construction of a box culvert as an example. An XYZ rectangular coordinate system is established with the width direction of the box culvert as the X-axis, the height direction as the Y-axis, and the length extension direction as the Z-axis. The box culvert in this embodiment consists of a pre-cast box culvert structure 1 and a proposed box culvert structure 2 connected as a single unit. The pre-cast box culvert structure 1 includes a pre-cast base slab and walls of a certain height. The proposed box culvert structure 2 is located on top of the pre-cast box culvert structure 1. The following section combines... Figures 1 to 13 The adjustable trolley mold frame described in this embodiment includes:

[0043] The formwork system 200 includes a top formwork assembly, a side formwork assembly, and a corner formwork panel, which correspond to the shape and position of the top surface, side surface, and corner of the inner cavity of the box culvert structure 2 to be cast.

[0044] The support frame 100 includes a support gantry 10, adjustable horizontal beams 20, adjustable cantilever beams 30, a corner formwork lift 50, a side formwork lift 42, a wall support lift 43, and a bottom lift 46. The support gantry 10 is a rectangular frame formed by two vertically and horizontally spaced columns 11 and two horizontal beams 12. Two support gantry 10s are vertically spaced, and multiple adjustable horizontal beams 20 are horizontally arranged and bolted between the two support gantry 10s to form the main frame. At least two adjustable cantilever beams 30 are mounted on the top horizontal beam 12 of each support gantry 10. The other end is detachably connected to the side formwork assembly. At least two pairs of side formwork lifters 42 and a pair of wall support lifters 43 are symmetrically arranged on the two columns 11 of each support gantry 10. The other end of the side formwork lifter 42 is detachably connected to the side formwork assembly. The other end of the wall support lifter 43 abuts against the wall of the cast-in-place box culvert structure 1. Multiple corner formwork lifters 50 are symmetrically arranged at both ends of the top formwork assembly along its axis. One end of the corner formwork lifter 50 is hinged to the edge of the top formwork assembly, and the other end is connected to the corner formwork panel pin. A bottom lifter 46 is connected to the bottom of each column 11 of the support gantry 10.

[0045] The control system 400 is mounted on the support frame 100 and is at least signal-connected to the corner formwork lift 50 and the bottom lift 46.

[0046] The adjustable trolley formwork frame of the present invention includes a support frame 100, a formwork system 200, and a control system 400. Two vertically spaced support gantry frames 10 and multiple adjustable horizontal beams 20 positioned between them constitute the main body of the support frame 100. Adjusting the extension length of the adjustable horizontal beams 20 allows the width of the support frame 100 to meet construction requirements. A bottom lifting mechanism 46 of the support gantry frame 10 is used to adjust the height of the support frame 100, ensuring that the height of the top formwork assembly is adapted to the height of the box culvert structure 2 to be cast. Side formwork is located on the outer sides of the columns 11 of the two support gantry frames 10. The lead screw end of the lifting platform 42 is connected to the pin of the side formwork assembly. At least one pair of adjustable cantilever beams 30, connected to the top of the crossbeam 12 of the support gantry 10, are also connected at their other ends to the pin of the side formwork assembly. The adjustable cantilever beams 30 can support the side formwork assembly and drive it to move back and forth along the X-axis. They can also finely adjust the height of the side formwork assembly along the Y-axis. Multiple corner formwork lifting platforms 50 are hinged to both ends of the top formwork assembly, with their other ends connected to the corner formwork panel. The corner formwork lifting platforms 50 extend and retract, causing the corner formwork panel to rotate around the end of the top formwork assembly. An adjustable horizontal beam is installed on the support frame 100. The adjustable cantilever beam, hoist, and control system work together to automatically and accurately adjust the closing positions of the top formwork assembly, side formwork assembly, and corner formwork panels, ensuring the precision of the concrete pouring structure, improving the adaptability of the support frame 100 to concrete structures with different cross-sectional dimensions, and enhancing the standardization level and turnover efficiency of the support frame 100 components. After the bottom hoist 46 of the support frame 100 retracts, the disassembled formwork system 200 and the support frame 100 are moved as a whole to the next construction section, and this process is repeated segment by segment to complete the concrete pouring construction of the box culvert. This adjustable trolley formwork... By utilizing the adjustable horizontal beam 20, adjustable cantilever beam 30, and the detachable connection between the elevator and the formwork system 200 on the support frame 100, the width and height of the formwork system 200 can be automatically adjusted, as well as the formwork system 200 can be automatically closed and disassembled. Moreover, the support frame 100 can carry the entire formwork system 200 to the next construction section. This adjustable trolley formwork frame has a high degree of automation, high equipment turnover efficiency, and safe and efficient overall movement, which effectively improves the level of industrialized construction, increases construction efficiency, enhances construction quality, and ensures construction safety.

[0047] In this embodiment, the top mold panel 211, side mold panel 224, and corner mold panel are all made of a frame welded from structural steel, and steel panels fixed to the outside of the frame. The horizontal back ribs and vertical back ribs are both made of two channel steels with openings facing outwards and spaced apart, and structural steel materials welded to the webs of the two channel steels respectively. Figure 5 and Figure 6As shown, the top mold assembly includes a top mold panel 211, multiple horizontal back ribs 212 spaced apart at its bottom, and multiple quick-connect fittings 213 for the back ribs. Each quick-connect fitting 213 consists of a U-shaped bending plate 213a, a screw 213b passing through the bending plate 213a, and multiple nuts. One end of the screw 213b is rigidly connected to a nut, and the other end passes through the connection hole between the bending plate 213a and the top mold panel 211 and is locked in place by the nut. The horizontal back ribs 212 are snapped into the hooks of the bending plate 213a, allowing them to be vertically snapped into the bottom of the top mold panel 211. The multiple horizontal back ribs 212 are assembled onto the top mold panel 211 via the quick-connect fittings 213, making assembly and disassembly convenient and quick, thus improving the installation efficiency of the template system 200.

[0048] like Figure 7 As shown, the side mold assembly includes a side mold panel 224, a second horizontal back rib 225, a first vertical back rib 226, a second vertical back rib 227, and a back rib quick connector. Multiple second horizontal back ribs 225 are connected to one side of the side mold panel 224 through the back rib quick connector. Specifically, the screw of the back rib quick connector passes through the side mold panel 224 and is locked and fixed by a nut. The second horizontal back rib 225 is snapped into the hook at the end of the bending plate, so that the second horizontal back rib 225 can be vertically snapped into one side of the side mold panel 224. The fastening between the side mold panel 224 and the second horizontal back rib 225 is achieved by rotating and tightening the nut. Two first vertical back ribs 226 are vertically spaced and correspond to the positions of the two columns 11 of the supporting gantry 10. The first vertical back ribs 226 are bolted to the second horizontal back rib 225. The two channel steels of the first vertical back ribs 226 are provided with corresponding elongated holes. The end of the screw of the side mold lifting machine 42 is embedded in the gap between the two channel steels. The pin passes through the elongated hole of the first vertical back rib 226 and the screw of the side mold lifting machine 42 and is fastened. The side mold lifting machine 42 can move vertically along the elongated hole of the first vertical back rib 226 without bearing the weight of the side mold assembly. Two second vertical back ribs 227 are vertically spaced and correspond to the positions of two adjustable cantilever beams 30. The second vertical back ribs 227 are bolted to the second horizontal back rib 225. The two channel steels of the second vertical back ribs 227 are provided with corresponding elongated holes. The end of the adjustable cantilever beam 30 is inserted into the gap between the two channel steels. The pin passes through the elongated hole of the second vertical back rib 227 and the end of the adjustable cantilever beam 30 and is fastened. The adjustable cantilever beam 30 carries the side mold assembly and can drive the side mold assembly to move along the X and Y directions for fine-tuning of its position.

[0049] like Figures 2 to 4As shown, the shape of the corner formwork panel matches the corner of the box culvert structure 2 to be cast. The corner formwork frame 231 has a first connection hole 235 and a second connection hole 236 at both ends. A groove 234 is located on the top surface of the corner formwork frame 231 near the first connection hole 235. The corner formwork frame 231 is pin-connected to the top formwork panel 211 of the top formwork assembly via the first connection hole 235. One end of the steel panel of the top formwork panel 211 can be snapped into the groove 234 of the corner formwork panel. The other end of the steel panel 232 of the corner formwork panel extends out of the corner formwork frame 231 as an extension end 237, which can be embedded into the groove at the end of the steel panel of the side formwork panel 224. Because the steel panels at the connection points of the top formwork panel 211, the corner formwork panel, and the side formwork panel 224 are sequentially stacked, the formwork panel connections are tightly joined, ensuring the casting quality of the box culvert concrete structure.

[0050] like Figure 2 and Figure 3 As shown, the corner mold lifting machine 50 includes a lead screw 51, a connecting rod 52 connected to one end of the lead screw 51, a screw drive device 54 threadedly connected to the other end of the lead screw 51, and an upper support 55 fixed to the end of the screw drive device 54. The upper support 55 is connected to the horizontal back rib 212 of the top mold assembly by a pin. The connecting rod 52 at the end of the lead screw 51 is connected to its pin through the connecting hole 236 of the corner mold frame 231. The screw drive device 54 is connected to the control system 400 by a signal. The control system 400 controls the extension and retraction of the lead screw 51 of the corner mold lifting machine 50, which drives the corner mold panel to rotate around the connecting hole 235 as the center along the end of the top mold assembly, thereby realizing the automatic mold closing and demolding of the corner mold panel.

[0051] like Figure 8 and Figure 9 As shown, each support gantry 10 also includes two pairs of connecting rods 15 and one pair of connecting rods 16. The two pairs of connecting rods 15 are vertically fixed to the connection points of the columns 11 and the crossbeams 12, respectively. One end of the connecting rod 15 near the box culvert structure 2 to be cast is bolted to the side formwork lift 42, and the other end of the connecting rod 15 is bolted to the adjustable horizontal beam 20. The pair of connecting rods 16 are vertically fixed to the outer sides of the bottom of the two columns 11, and the ends of the connecting rods 16 are bolted to the wall support lift 43. Each support gantry 10 is also provided with a cantilever beam support frame 18. A horizontal connecting rod 17 parallel to the crossbeam 12 is provided between the pair of connecting rods 15 at the top. The pair of cantilever beam support frames 18 are horizontally spaced and fixed to the crossbeams 12 and the horizontal connecting rods 17, respectively. A support plate is provided on the top of the cantilever beam support frame 18 for fixing the adjustable cantilever beam 30. Since a pair of connecting rods 15, crossbeam 12 and horizontal connecting rod 17 together form a closed rectangular support plane, they can provide stable support for the adjustable cantilever beam 30.

[0052] like Figure 8 and Figure 9As shown, each support frame 10 also includes an adjusting screw 41 vertically connected to the top of the column 11. The connecting plate fixed to the top of the adjusting screw 41 is bolted to the cross back rib 212 of the top mold assembly. The upper and lower support internal threads of the adjusting screw 41 are left-handed and right-handed, respectively, for fine-tuning the height of the top mold assembly.

[0053] like Figure 8 and Figure 9 As shown, each supporting gantry 10 also includes a pair of roller connecting rods 13 and a pair of rollers 47. The bottom of the pair of connecting rods 15 at the bottom is vertically connected to the pair of roller connecting rods 13. The connecting plate fixed to the bottom end of each roller connecting rod 13 is bolted to the roller 47. After the current construction section of the box culvert structure 2 is completed, the rollers 47 of the supporting frame 100 are supported by the traveling device (not shown in the figure), and the bottom lifting machine 46 is controlled to retract. The demolded formwork system 200 and the supporting frame 100 move to the next construction section with the traveling device.

[0054] like Figure 8 and Figure 9 As shown, each support gantry 10 also includes a secondary crossbeam 14 arranged in parallel between a pair of crossbeams 12, and the support frame 100 also includes a working platform 60 mounted on top of the two secondary crossbeams 14. The working platform 60 is used to provide a safe and reliable support surface for construction workers to work at height.

[0055] like Figure 10 As shown, the adjustable cantilever beam 30 includes a cantilever beam 31, a support bracket, and a pressing bracket. The support bracket includes a base 33, a sleeve 32 connected to the base 33, and a first bearing 34 pinned to the bottom of the sleeve 32. One end of the cantilever beam 31 passes through the sleeve 32 and is supported by the first bearing 34. The pressing bracket includes a U-shaped support frame 35, an adjustable screw 36 connected to the top of the support frame 35, a second bearing 37 located at the bottom of the adjustable screw 36 and pinned to the support frame 35, and a pressing bracket. The cantilever beam 31 has one end that passes through the support frame 35 and is located at the bottom of the second bearing 37 and the axial pressure block. Both the support support and the lower pressure support are bolted to the cantilever beam support frame 18. The two ends of the cantilever beam 31 are respectively provided with pin hole 1 38 and pin hole 2 39. The pin hole 1 38 of the cantilever beam 31 near the box culvert structure 2 to be cast is connected to the pin shaft of the second vertical back rib 227 of the side formwork assembly. A stop block (not shown in the figure) is installed in the pin hole 2 39 at the other end of the cantilever beam 31 to prevent the cantilever beam 31 from sliding out of the lower pressure support. The adjustable screw 36 rotates downward to push the second bearing 37 and the axial pressure block to move along the Y-axis, so that the cantilever beam 31 can support the side formwork assembly to rotate a certain angle around the first bearing 34 of the support support in the XY plane. This not only allows for fine adjustment of the installation position of the side formwork assembly, but also facilitates the rapid closing and disassembly of the side formwork assembly.

[0056] like Figure 11 and Figure 12 As shown, the adjustable horizontal beam 20 includes a first horizontal beam 21 made of I-beams and a second horizontal beam 23 made of two channel steels spaced apart and opposite to each other. The web of the first horizontal beam 21 is adapted to the gap between the two channel steels of the second horizontal beam 23, so that the first horizontal beam 21 can be fitted into the gap of the second horizontal beam 23 and slide relative to each other. The webs of the first horizontal beam 21 and the second horizontal beam 23 are provided with multiple bolt holes spaced apart. The positioning bolts pass through the bolt holes of the first horizontal beam 21 and the second horizontal beam 23 and are locked and fixed. The other ends of the first horizontal beam 21 and the second horizontal beam 23 are vertically connected to side plates 24 with bolt holes. The side plates 24 of the first horizontal beam 21 and the second horizontal beam 23 are respectively bolted to the connecting rods 15 of the two side support frames 10. By adjusting the length of the adjustable horizontal beam 20, the width of the support frame 100 along the X-axis direction is adapted to the width of the box culvert structure 2 to be cast.

[0057] like Figure 13 As shown, each support gantry 10 has a bottom sleeve 45 at the bottom of its column 11. The bottom sleeve 45 is formed by a vertically arranged cylinder 451 and a base plate 452. The base plate 452 is bolted to the bottom lifting mechanism 46. The cylinder 451 can be fitted inside the column 11. The side wall of the cylinder 451 and the bottom of the column 11 are vertically spaced with multiple through holes. The bottom sleeve 45 is fitted on the bottom of the support gantry 10 and connected by a pin through the through hole, so that the bottom lifting mechanism 46 can be detachably connected to the bottom of the support frame 100. The height of the support gantry 10 can be indirectly adjusted by changing the relative position between the bottom sleeve 45 and the column 11.

[0058] In this embodiment, both the side mold lifting machine 42 and the bottom lifting machine 46 can be screw jacks. Of course, this is just an example, and the lifting machine is not limited to this.

[0059] Example 2

[0060] Combination Figures 1 to 13 The installation method of the adjustable trolley mold frame in this embodiment is explained below, with specific steps as follows:

[0061] S10: Prefabricate top formwork components, side formwork components, and corner formwork panels that meet the dimensions required for box culvert construction, such as... Figures 2 to 7 As shown, the corner formwork lifting machine 50 pin is connected to the end of the horizontal back rib 212 of the top formwork assembly. The top formwork panel 211 is not installed yet. The side formwork assembly is assembled. Wooden blocks are laid on the ground. The side formwork panel 224 is laid flat on the wooden blocks with the steel panel facing down. The wooden blocks protect the steel panel. The back rib quick connector 213 is used to fix multiple horizontal back ribs 225 to the side formwork panel 224. Then, multiple first vertical back ribs 226 and multiple second vertical back ribs 227 are bolted to the horizontal back ribs 225.

[0062] S12: As Figures 8 to 12 As shown, assembling the support frame 100: Adjust the adjustable horizontal beam 20 to the designed length and lock it in place. Place two support frames 10 flat. Bolt the bottom lifting platform 46 to the bottom of the columns 11 of the two support frames 10 and adjust it to the designed height. Install four adjustable horizontal beams 20 on one of the support frames 10 and erect it for temporary support. Bolt the other support frame 10 to the other end of the four adjustable horizontal beams 20 to form the main support structure. Construction workers install other components of the support frame 100 from bottom to top. Install the wall support lifting platform 43 on the connecting rod 2 16. Install the side formwork lifting platform 42 on the outside of the connecting rod 1 15 at the bottom. Lay the working platform 60 on the top of the two secondary crossbeams 14. Then... Construction workers stand on the work platform 60 and install multiple side formwork lifts 42 on the outside of the connecting rod 15 at the top. They install cantilever beam support frames 18 on the top of the crossbeam 12 and the horizontal connecting rod 17. The adjustable cantilever beam 30 is not installed temporarily to prevent it from falling. An adjusting screw 41 is installed on the top of the column 11. Four bottom lifts 46 are placed on the ground to suitable installation positions. The support frame 100, assembled by four-point lifting, is placed on top of the four bottom lifts 46. The bottom lifts 46 are bolted to the bottom of the column 11. The electrical control box of the control system 400 is installed on the support frame 100. Construction workers connect the adjustable cantilever beam 30 to the cantilever beam support frame 18 on the work platform 60 and temporarily fix the adjustable cantilever beam 30.

[0063] S13: Assembled formwork system 200: Hoist the hinged top formwork assembly and corner formwork lift 50 to the top of the support frame 100, bolt the horizontal back rib 212 of the top formwork assembly to the upper support of the adjusting screw 41, hoist the top formwork panel 211 and place it on top of the horizontal back rib 212, and connect and fix the two using the back rib quick connector 213. The electrical control box of the control system 400 is electrically connected to the corner formwork lift 50, the side formwork lift 42, the bottom lift 46, and the wall support lift 43, and the electrical control debugging of the extension and retraction of each lift is performed; adjust the side formwork lift 4... 2. Adjust the adjustable cantilever beam 30 to a suitable length, hoist the side formwork assembly so that the second vertical back rib 227 and the adjustable cantilever beam 30 are connected by a pin. The adjustable cantilever beam 30 bears the weight of the side formwork assembly. Adjust the side formwork lift 42 to a suitable length. The screw of the side formwork lift 42 is connected to the first vertical back rib 226 by a pin. Adjust the screw of the corner formwork lift 50 to a suitable length and connect it to the corner formwork frame 231 by a pin. The extension and retraction of the corner formwork lift 20 can drive the corner formwork panel to rotate around the end of the top formwork assembly, which facilitates the closing and disassembly of the corner formwork panel and avoids conflict and collision between the corner formwork panel and the side formwork assembly.

[0064] Example 3

[0065] Combination Figures 1 to 14The adjustment method of the adjustable trolley formwork in this embodiment is as follows:

[0066] Height adjustment steps of the side formwork assembly: In the closed mold state, rotate the adjustable screw 36 of the pressing support of the adjustable cantilever beam 30 to make the second bearing 37 and the shaft pressing block push the cantilever beam 31 to carry the side formwork assembly to rotate a certain angle around the first bearing 34 of the support support in the XY plane until the side formwork panel 224 and the corner formwork panel are completely fitted. Adjusting the height of the side formwork assembly by using the adjustable cantilever beam 30 can, on the one hand, avoid the problem that the side formwork panel 224 and the corner formwork panel are not tightly fitted due to insufficient height of the side formwork assembly, and on the other hand, avoid the torsion of the side formwork assembly in the YZ plane due to different heights on both sides after the installation of the side formwork assembly.

[0067] Height adjustment steps of the top formwork assembly: In the closed mold state, use a surveying instrument to detect the flatness of the top formwork assembly, and finely adjust the height of the top formwork assembly by rotating the nut of the adjusting screw 41 until the levelness of the top formwork assembly meets the construction requirements. Fine-tuning the height of the top formwork assembly by using the adjusting screw 41 can avoid the problem that the top formwork assembly is uneven in the XZ plane due to installation errors.

[0068] As Figure 14 shown, the size adjustment steps of the support frame 100 are as follows:

[0069] S1: Adjust the length of the adjustable horizontal beam 20 and adjust the size of the support frame 100 along the X-axis direction so that l satisfies the following formula 1:

[0070] Minimum value of N ≤ (L - l) / 2 - M ≤ Maximum value of N (Formula 1)

[0071] Where, L is the net distance between the two side walls of the box culvert structure 2 to be poured;

[0072] l is the width of the support frame 100;

[0073] M is the thickness of the side formwork assembly;

[0074] N is the total length of the side formwork lifter 42;

[0075] S2: Adjust the size of the support frame 100 along the Y-axis direction so that h satisfies the following formula 2:

[0076] (Minimum value of (K + G)) < H - J - h < (Maximum value of (K + G)) (Formula 2)

[0077] Where, H is the net height of the box culvert structure 2 to be poured;

[0078] h is the height of the column 11 of the support frame 100;

[0079] J is the thickness of the top formwork assembly;

[0080] K represents the height of the adjusting screw 41;

[0081] G represents the height of the bottom lift, which is 46.

[0082] Example 4

[0083] Combination Figure 15 and Figure 16 The construction method of the adjustable trolley formwork of the present invention is described below, with specific steps as follows:

[0084] S21: The concrete pouring of the precast box culvert structure 1 is completed in advance using traditional formwork. The precast box culvert structure 1 includes a base slab cast as a whole and a wall of a certain height. After the concrete meets the design strength requirements, the assembled support frame 100 and formwork system 200 are placed in the first construction section of the box culvert structure 2 to be poured.

[0085] S22: As Figure 15 As shown, after the support frame 100 is in place, the wall support lifts 43 on both sides of the support frame 100 are extended and abut against the wall of the cast-in-place box culvert structure 1. The bottom lift 46 is extended and supported on the bottom plate. At the same time, the top formwork assembly is lifted to the design height. The screw 51 of the corner formwork lift 50 is extended and pushed to extend the corner formwork panel and assemble it with the top formwork assembly. The slot 234 of the corner formwork frame 231 is engaged with the protruding edge of the top formwork panel 211. The side formwork lift 42 is extended and pushed to extend the side formwork assembly and assemble it with the corner formwork panel. The extension end 237 of the corner formwork panel is engaged with the end slot of the side formwork panel 224. That is, the formwork system 200 is completed in the order of first assembling the top formwork assembly, then assembling the corner formwork panel, and finally assembling the side formwork assembly. The width and height of the support frame 100 and the formwork system 200 are checked and adjusted until the construction requirements are met.

[0086] S23: As Figure 16 As shown, the steel bars of the walls and top slab of the box culvert structure 2 to be poured are tied, the external side formwork and end formwork are installed and reinforced with tie rods and side formwork components, the concrete of the walls and top slab is poured, and after the concrete reaches the design strength, the wall support elevator 43 is controlled to retract away from the wall of the poured box culvert structure 1, and the side formwork elevator 42, corner formwork elevator 50 and bottom elevator 46 are controlled to retract in sequence. The formwork system 200 is opened in the order of opening the side formwork components, then opening the corner formwork panels, and finally opening the top formwork components.

[0087] S24: After the current construction section of the proposed box culvert structure 2 is completed, the rollers of the support frame 100 are supported on the traveling device (not shown in the figure), and the bottom elevator 46 is controlled to retract, so that the demolded formwork system 200 and the support frame 100 move with the traveling device to the next construction section of the proposed box culvert structure 2.

[0088] S25: Repeat steps S22 to S24 until the concrete pouring construction of the proposed box culvert structure 2 is completed segment by segment.

[0089] The construction method of the adjustable trolley formwork frame of the present invention involves placing the assembled support frame 100 and formwork system 200 in the first construction section of the box culvert structure 2 to be poured. The wall support lift 43 extends and supports the wall of the already poured box culvert structure 1. The bottom lift 46 is controlled to extend and lift the top formwork assembly to the designed height. The corner formwork lift 50 is controlled to extend and push the corner formwork panel to assemble with the top formwork assembly. The side formwork lift 42 is controlled to extend and push the side formwork assembly out and assemble with the corner formwork panel. The formwork system 200 is closed in the order of closing the top formwork assembly first, then the corner formwork panel, and finally the side formwork assembly. After the construction of the walls and top slab of the current construction section of the box culvert structure 2 is completed, the wall support elevator 43 is controlled to retract and move away from the wall. The side formwork elevator 42, corner formwork elevator 50, and bottom elevator 46 are controlled to retract in sequence. The side formwork components are opened, then the corner formwork panels are opened, and finally the top formwork components are opened to realize the formwork system 200 opening construction. The bottom elevator 46 is controlled to retract, so that the formwork system 200 and the support frame 100 after demolding are moved to the next construction section of the box culvert structure 2 to be poured. This process is repeated until the concrete pouring construction of the box culvert structure 2 is completed section by section. This construction method utilizes overlapping steel panels at the connection points of the top formwork components, corner formwork panels, and side formwork components to achieve seamless splicing, preventing grout leakage from affecting the quality of concrete pouring. It also employs multi-angle telescopic adjustable components on the support frame 100 for detachable connection with the formwork system 200, enabling automated adjustment of the width and height of the formwork system 200, as well as automated closing and dismantling of each formwork component. This method boasts a high degree of automation, high equipment turnover efficiency, and safe and efficient overall movement, improving the level of industrialized construction, enhancing construction efficiency and quality, and ensuring construction safety.

[0090] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the claims.

Claims

1. A construction method for an adjustable trolley formwork, the specific steps of which are as follows: S21: After the concrete pouring of the pre-cast box culvert structure is completed and the concrete meets the design strength requirements, the assembled support frame and formwork system are placed in the first construction section of the box culvert structure to be poured. The formwork system includes top formwork components, corner formwork panels, and side formwork components. The support frame includes support gantry frames, adjustable horizontal beams, adjustable cantilever beams, corner formwork lifts, side formwork lifts, wall support lifts, and bottom lifts. The support gantry frames are rectangular frames connected by two vertically and horizontally spaced columns and two horizontal beams. The two support gantry frames are vertically spaced, and multiple adjustable horizontal beams are horizontally arranged and bolted together. The frame is formed by connecting two supporting gantry frames. At least two adjustable cantilever beams are installed on the top beam of each supporting gantry frame. The other end of the adjustable cantilever beam is detachably connected to the side formwork assembly. At least two pairs of side formwork lifters and one pair of wall support lifters are symmetrically installed on the two columns of each supporting gantry frame. The other end of the side formwork lifter is detachably connected to the side formwork assembly. Multiple corner formwork lifters are symmetrically arranged at both ends of the top formwork assembly along its axis. One end of the corner formwork lifter is hinged to the edge of the top formwork assembly, and the other end is connected to the corner formwork panel pin. A bottom lifter is connected to the bottom of each column of the supporting gantry frame. S22: After the support frame and formwork system are in place, extend the bottom lift and support it on the base plate. Simultaneously, lift the top formwork assembly to the designed height. Extend the wall support lifts on both sides of the support frame to abut against the walls of the already poured box culvert structure. Extend the corner formwork lift to push the corner formwork panel out and assemble it with the top formwork assembly. Then, extend the side formwork lift to push the side formwork assembly out and use the adjustable cantilever beam to fine-tune the position of the side formwork assembly so that the side formwork assembly is assembled with the corner formwork panel. Check and adjust the width and height of the support frame and formwork system until they meet the construction requirements. The corner formwork frame of the corner formwork panel has a connecting hole one and a connecting hole two at both ends. The top surface of the corner formwork frame near the connecting hole one has a slot. The corner formwork frame is connected to the top formwork panel of the top formwork assembly through the connecting hole one. One end of the steel panel of the top formwork panel can be snapped onto the corner formwork surface. The corner mold panel has a slot, and the other end of the steel panel of the corner mold panel extends out of the corner mold frame as an extension end, which can be embedded in the slot at the end of the steel panel of the side mold panel. Multiple corner mold lifting machines are symmetrically arranged at both ends of the top mold assembly along its axis. One end of the corner mold lifting machine is hinged to the edge of the top mold assembly, and the other end is connected to the corner mold panel pin. The corner mold lifting machine includes a lead screw, a connecting rod connected to one end of the lead screw, a screw drive device threaded to the other end of the lead screw, and an upper support fixed to the end of the screw drive device. The upper support is connected to the pin of the horizontal back rib of the top mold assembly. The connecting rod at the end of the lead screw is connected to the pin through the connecting hole two of the corner mold frame. The screw drive device is connected to the control system signal. Controlling the extension and retraction of the lead screw of the corner mold lifting machine drives the corner mold panel to rotate around the connecting hole one along the end of the top mold assembly, pushing the corner mold panel out and assembling it with the top mold assembly. S23: Tie the reinforcing bars of the walls and top slab of the box culvert structure to be cast, install the external side formwork and end formwork, and reinforce them with tie rods and side formwork components. Pour the concrete for the walls and top slab. After the concrete reaches the design strength, control the wall support elevator to retract and separate from the walls of the cast box culvert structure; control the side formwork elevator to retract and drive the side formwork components to retract and separate from the walls; then control the screw of the corner formwork elevator to retract and drive the corner formwork panel to retract and separate from the corner of the box culvert, thus realizing the formwork system opening construction. S24: After the current construction section of the box culvert structure to be cast is completed, the rollers of the support frame are supported by the traveling device, and the bottom elevator is retracted, so that the demolded formwork system and support frame are moved with the traveling device to the next construction section of the box culvert structure to be cast; S25: Repeat steps S22 to S24 until the concrete pouring construction of the box culvert structure to be poured is completed segment by segment.

2. The construction method of the adjustable trolley formwork according to claim 1, characterized in that: The adjustable horizontal beam includes a first horizontal beam made of I-beams and a second horizontal beam made of two channel steels spaced apart and opposite to each other. The web of the first horizontal beam is adapted to the gap between the two channel steels of the second horizontal beam, so that the first horizontal beam can be fitted into the gap of the second horizontal beam and slide relative to each other. The web of both the first and second horizontal beams is provided with multiple bolt holes spaced apart. Positioning bolts pass through the bolt holes of the first and second horizontal beams and are locked and fixed. The other end of the first and second horizontal beams is vertically connected to a side plate with bolt holes. The side plates of the first and second horizontal beams are respectively bolted to the connecting rods of the two supporting portal frames. In step S21, the extension length of the adjustable horizontal beam is determined according to the width of the box culvert structure to be cast. After adjusting the relative position of the first horizontal beam and the second horizontal beam to the required length for construction, the positioning bolts pass through the bolt holes of the first horizontal beam and the second horizontal beam and are locked and fixed.

3. The construction method of the adjustable trolley formwork according to claim 1, characterized in that: Each of the aforementioned support gantry frames also includes two pairs of connecting rods, one pair of connecting rods, one pair of roller connecting rods, and one pair of rollers. The two pairs of connecting rods are respectively vertically fixed to the connection points of the columns and the crossbeams. The end of the connecting rod near the box culvert structure to be cast is bolted to the side formwork lifting machine, and the other end of the connecting rod is bolted to the adjustable horizontal beam. The pair of connecting rods are respectively vertically fixed to the outer sides of the bottom of the two columns. The ends of the connecting rods are bolted to the wall support lifting machine. The bottom of the pair of connecting rods at the bottom is vertically connected to a pair of roller connecting rods. The connecting plate fixed to the bottom end of each roller connecting rod is bolted to the roller.

4. The construction method of the adjustable trolley formwork according to claim 1, characterized in that: The adjustable cantilever beam includes a cantilever beam, a support bracket, and a lower support bracket. The support bracket includes a base, a sleeve connected to the base, and a first bearing connected to the bottom of the sleeve by a pin. One end of the cantilever beam passes through the sleeve and is supported by the first bearing. The lower support bracket includes a U-shaped support frame, an adjustable screw connected to the top of the support frame, a second bearing and a shaft pressure block located at the bottom of the adjustable screw and connected to the support frame by a pin. The other end of the cantilever beam passes through the support frame and is located at the bottom of the second bearing and the shaft pressure block. Both the support bracket and the lower support bracket are bolted to the cantilever beam support frame. The two ends of the cantilever beam are respectively provided with a pin hole one and a pin hole two. The pin hole one of the cantilever beam, which is close to the box culvert structure to be cast, is connected to the second vertical back rib pin of the side formwork assembly. A stop block is installed in the pin hole two at the other end of the cantilever beam. In steps S22 and S23, during the process of closing and disassembling the side formwork assembly, the adjustable screw rotates downward to push the second bearing and the axial pressure block to move along the Y-axis, so that the cantilever beam can support the side formwork assembly to rotate around the first bearing of the support in the XY plane to the installation position required for construction, thereby achieving fine adjustment of the installation position of the side formwork assembly.

5. The construction method of the adjustable trolley formwork according to claim 1, characterized in that: Each support gantry also includes a secondary crossbeam arranged parallel to a pair of crossbeams, and the support frame also includes a working platform mounted on top of the two secondary crossbeams.

6. The construction method of the adjustable trolley formwork according to claim 1, characterized in that: In step S21, the top mold assembly includes a top mold panel, multiple horizontal back ribs spaced apart at its bottom, and multiple back rib quick connectors. Each back rib quick connector consists of a U-shaped bending plate, a threaded rod penetrating the bending plate, and multiple nuts. One end of the threaded rod is rigidly connected to a nut, and the other end passes through the connection hole between the bending plate and the top mold panel and is locked in place by the nut. The horizontal back ribs are snapped into hooks on the bending plate, allowing them to be vertically snapped into the bottom of the top mold panel. The side mold assembly includes a side mold panel, horizontal back ribs, a first vertical back rib, a second vertical back rib, and back rib quick connectors. Multiple horizontal back ribs are connected to one side of the side mold panel via the back rib quick connectors. Two first vertical back ribs... Vertical back ribs are set vertically at intervals and correspond to the positions of the two columns supporting the gantry. The first vertical back rib is bolted to the second horizontal back rib. The two channel steels of the first vertical back rib have corresponding elongated holes. The end of the screw of the side formwork lifting machine is embedded in the gap between the two channel steels. The pin passes through the elongated hole of the first vertical back rib and the screw of the side formwork lifting machine and is tightened. Two second vertical back ribs are set vertically at intervals and correspond to the positions of the two adjustable cantilever beams. The second vertical back ribs are bolted to the second horizontal back rib. The two channel steels of the second vertical back rib have corresponding elongated holes. The end of the adjustable cantilever beam is embedded in the gap between the two channel steels. The pin passes through the elongated hole of the second vertical back rib and the end of the adjustable cantilever beam and is tightened.

7. The construction method of the adjustable trolley formwork according to claim 1, characterized in that: Each of the supporting gantry frames also includes an adjusting screw vertically connected to the top of the column, and the adjusting screw is bolted to the top mold assembly; Each support gantry column is also provided with a gantry bottom sleeve at the bottom. The gantry bottom sleeve is made of a vertically set cylinder and a base plate. The base plate is bolted to the bottom lift. The cylinder can be fitted inside the column, and multiple through holes are vertically spaced between the side wall of the cylinder and the bottom of the column. The gantry bottom sleeve is fitted to the bottom of the support gantry and connected by a pin through the through hole, so that the bottom lift can be detachably connected to the bottom of the support frame. In step S22, the relative position between the cylinder of the bottom sleeve of the gantry and the column is adjusted to the required construction height, and the two are connected and fixed by a pin through the through hole. The bottom lift is controlled to extend and support the bottom plate of the cast-in-place box culvert structure. The extension and retraction length of the adjusting screw is adjusted to lift the top formwork assembly to the design height.

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