Box girder pouring device with retractable box girder core form structure

Abstract

The application relates to a box girder pouring device with a box girder core mold structure capable of being retracted, which comprises a welding gun power supply structure, a box girder outer mold and a box girder core mold enclosed by a core mold bottom plate, a core mold top plate, a core mold left side plate and a core mold right side plate, the core mold bottom plate comprises a bottom plate left segment and a bottom plate right segment which are hingedly connected, the core mold top plate comprises a top plate left segment and a top plate right segment which can be opened and closed, the core mold left side plate comprises an upper left side plate segment and a lower left side plate segment which are hingedly connected, the core mold right side plate comprises an upper right side plate segment and a lower right side plate segment which are hingedly connected, the bottom plate left segment is fixedly connected with the lower left side plate segment, the upper left side plate segment is fixedly connected with the top plate left segment, the top plate right segment is fixedly connected with the upper right side plate segment, and the lower right side plate segment is fixedly connected with the bottom plate right segment, the lower left side plate segment is connected with the lower right side plate segment through a transverse telescopic structure, and the core mold bottom plate is connected with the core mold top plate through a vertical telescopic structure. The application has the advantages of labor saving in extracting the core mold and solves the problem of labor consumption in extracting the box girder core mold during box girder prefabrication.

Description

Technical Field

[0001] This invention relates to the field of road and bridge construction technology, and in particular to a box girder casting device with a retractable box girder core mold structure. Background Technology

[0002] During road construction, bridges are sometimes necessary. One method of bridge construction involves building piers and abutments, installing crossbeams on the piers, rapidly prefabricating box girders between the crossbeams, and then casting reinforced concrete onto the box girders. The box girder prefabrication process involves building a steel reinforcement cage inside the outer formwork of the box girder, placing the box girder core mold inside the steel reinforcement cage, pouring concrete, removing the side and end formwork of the outer formwork after the concrete has solidified, curing, and then removing the core mold. The existing prefabricated box girder manufacturing process has the following shortcomings: when welding the steel reinforcement cage, the welding machine is moved on the ground, and the dragging of the power cord on the ground is prone to damage; removing the box girder core mold is laborious. Summary of the Invention

[0003] The first objective of this invention is to provide a box girder casting device with a retractable box girder core mold structure that saves effort in removing the core mold during box girder prefabrication, thus solving the problem of laborious removal of the box girder core mold during box girder prefabrication.

[0004] The second objective of this invention is to further provide a box girder casting device with a retractable box girder core mold structure in which the electric wire is suspended during welding, thereby solving the problem that the electric wire is easily damaged when dragged during the welding of precast box girders.

[0005] The above technical problems are solved by the following technical solution: a box girder casting device with a retractable box girder core mold structure, comprising an outer box girder mold and a core mold, wherein the outer box girder mold includes a bottom template plate, two side templates detachably connected to the transverse ends of the bottom template, and two end templates detachably connected to the longitudinal ends of the bottom template, the bottom template plate, the two side templates, and the two end templates forming a box girder cavity, and the core mold being used to form the inner cavity of the box girder, characterized in that it further includes a welding gun power supply structure, wherein the core mold is composed of a core mold bottom plate, a core mold top plate, a core mold left side plate, and a core... The core mold consists of a tubular structure formed by the right side plates. The core mold base plate includes a left and right section, the core mold top plate includes a left and right section, the core mold left side plate includes an upper and lower section, and the core mold right side plate includes an upper and lower section. The left and right sections of the base plate are connected by several base plate hinges. The right end face of the left section and the left end face of the right section abut against each other. The base plate hinges are located inside the box girder core mold. The left and right sections of the top plate can be separated and joined together. The upper and lower sections of the left side plate are connected by several left side hinges. The plates are hinged together, with the lower end face of the upper section of the left side plate abutting against the upper end face of the lower section of the left side plate. The left side plate hinge is located inside the box girder core mold. The upper and lower sections of the right side plate are connected together by several right side plate hinges, with the lower end face of the upper section of the right side plate abutting against the upper end face of the lower section of the right side plate. The right side plate hinge is located inside the box girder core mold. The left section of the bottom plate is fixedly connected to the lower section of the left side plate, the upper section of the left side plate is fixedly connected to the left section of the top plate, the right section of the top plate is fixedly connected to the upper section of the right side plate, and the lower section of the right side plate is fixedly connected to the right section of the bottom plate. The lower section of the left side plate and the right side plate are also fixed together. The lower sections are connected by a lateral telescopic structure, which drives the lower sections of the left and right sides of the plate to rotate around the hinge of the bottom plate. The bottom plate and top plate of the core mold are connected by a vertical telescopic structure, which drives the right section of the top plate to rotate around the hinge of the right side of the plate and the left section of the top plate to rotate around the hinge of the left side of the plate. When the core mold of the box girder retracts inward, the movement trajectories of the right section of the top plate, the left section of the top plate, the upper section of the left side plate, the lower section of the left side plate, the upper section of the right side plate, the lower section of the left side plate, the left section of the bottom plate, and the right section of the bottom plate are all located within the space enclosed by the inner circumference of the box girder. When disassembling the box girder core mold, the vertical telescopic structure is first retracted, driving the right section of the top plate and the upper section of the right side plate to rotate inwards around the right side plate hinge, thus detaching from the box girder. The left section of the top plate and the upper section of the left side plate are then driven to rotate inwards around the left side plate hinge, detaching from the box girder. Next, while ensuring the bottom plate of the box girder can rotate, the horizontal telescopic structure is retracted, causing the lower section of the left side plate and the left section of the bottom plate to rotate around the bottom plate hinge, detaching from the box girder. Similarly, the lower section of the right side plate and the right section of the bottom plate rotate around the bottom plate hinge, detaching from the box girder. Finally, the box girder core mold is pulled out. This technical solution allows the core mold to detach from the box girder before being pulled out, thus reducing the effort required to remove the core mold. This reduced effort allows for the fabrication of box girders of longer lengths.The way to ensure that the bottom formwork can rotate is to first lift the bottom plate of the core mold, the lower section of the left side plate, and the lower section of the right side plate upwards to the position where the bottom plate of the box girder can rotate and be closed.

[0006] Preferably, the vertical telescopic structure includes a left vertical cylinder and a right vertical cylinder. The cylinder body of the right vertical cylinder is hinged to the inner surface of the right section of the bottom plate via a right longitudinal lower hinge shaft, and the piston rod of the right vertical cylinder is hinged to the inner surface of the right section of the top plate via a right longitudinal upper hinge shaft. The cylinder body of the left vertical cylinder is hinged to the inner surface of the left section of the bottom plate via a left longitudinal lower hinge shaft, and the piston rod of the left vertical cylinder is hinged to the inner surface of the left section of the top plate via a left longitudinal upper hinge shaft. The lateral telescopic structure includes a lateral cylinder. The left end of the lateral cylinder is hinged to the inner surface of the lower section of the left side plate via a longitudinal left hinge shaft, and the right end is hinged to the inner surface of the lower section of the right side plate via a longitudinal right hinge shaft.

[0007] Preferably, the left end face of the right section of the roof slab and the right end face of the left section of the roof slab are fitted together. This allows for a more convenient and reliable sealing connection between the left and right ends of the roof slab, preventing grout leakage.

[0008] Preferably, a longitudinal groove is also included. Both the inner and outer surfaces of the longitudinal groove are arc surfaces. The centerline of the cylinder containing the inner surface of the longitudinal groove is the axis of the hinge of the base plate. The cylinder containing the inner surface of the longitudinal groove and the cylinder containing the outer surface of the longitudinal groove are coaxial. The left end of the longitudinal groove passes through the lower surface of the left section of the base plate, and the right end passes through the lower surface of the right section of the base plate. This technical solution ensures that the core mold base plate is directly positioned to allow it to rotate. That is, no lifting action is required; the lower left section of the left plate and the left section of the base plate can be driven to rotate around the hinge of the base plate to detach from the box girder, and the lower right section of the right plate and the right section of the base plate can be driven to rotate around the hinge of the base plate to detach from the box girder. This improves the convenience of demolding the box girder core mold.

[0009] Preferably, the left end face of the right section of the base plate and the right end face of the left section of the base plate are fitted together, with the left end face of the right section of the base plate pressing against the right end face of the left section of the base plate. At least one row of supporting balls is provided on the lower surface of the left section of the base plate, with the supporting balls in the same row distributed longitudinally and supported on the inner surface of the longitudinal groove. This design makes pulling out the box girder core mold easier. The longitudinal groove can be removed for reuse or retained on the box girder core mold. The method for removing the longitudinal groove is as follows: with both ends of the longitudinal groove extending beyond the box girder, after the box girder core mold is closed, lift both ends of the longitudinal groove to separate it from the adjacent core mold, then pull out the adjacent core mold, and then pull out the longitudinal groove. This method avoids breakage during the process of lifting the longitudinal groove to separate it from the box girder.

[0010] Preferably, when the outer formwork of the box girder is assembled, the end template is fitted onto the core formwork of the box girder, the end template is sealed against the end face of the side template, and the end template is sealed against the end face of the bottom template. The inner surface of the right section of the top plate is provided with a connecting ear for the right section of the top plate, the inner surface of the left section of the top plate is provided with a connecting ear for the left section of the top plate, the inner surface of the upper section of the left side plate is provided with a connecting ear for the upper section of the left side plate, the inner surface of the lower section of the left side plate is provided with a connecting ear for the lower section of the left side plate, the inner surface of the upper section of the right side plate is provided with a connecting ear for the upper section of the right side plate, and the inner surface of the lower section of the right side plate is provided with a connecting ear for the lower section of the right side plate. The end template is provided with a plurality of end template connecting ears, and a plurality of end template fixing bolts pass through the end template connecting ears one by one and are threaded onto the connecting ears for the right section of the top plate, the left section of the top plate, the upper section of the left side plate, the lower section of the left side plate, the upper section of the right side plate, and the lower section of the right side plate, so that the end template abuts against the end face of the side template. The fixed end formwork is convenient to use, and its structure can assist in fixing the box girder core mold, preventing it from closing. It also improves the manufacturing precision required for simultaneously sealing the end formwork, side formwork, and bottom formwork.

[0011] Preferably, the welding torch power supply structure includes a longitudinal slide rail, a longitudinal suspension cable, a welding machine, a bracket slidably suspended on the longitudinal slide rail, and a welding machine input wire connected at one end to the welding machine. The welding machine is fixed on the bracket and has a positive output wire and a negative output wire. A conductive block is connected to the end of the negative output wire, and the welding torch is connected to the positive output wire. A suspension ring is fixed to the welding machine input wire, distributed along the extension direction of the welding machine input wire. The suspension ring is sleeved on the longitudinal suspension cable. In use, the other end of the welding machine input wire is connected to a power source to supply power to the welding machine. During use, the welding machine is moved to the desired position for welding by sliding the bracket on the longitudinal slide rail. When the bracket moves, the welding machine input wire is retracted or expanded on the longitudinal suspension cable. This avoids the wire being dragged underground, achieving the fourth objective of the invention. During welding, the conductive block is placed on the part of the object being welded that is connected to the welding part, and the welding torch performs the welding.

[0012] Preferably, the longitudinal slide rail has a polygonal cross-section. A single longitudinal slide rail is sufficient for sliding the hanger and prevents the hanger from rotating.

[0013] Preferably, the lower end of the bracket is provided with a storage frame, in which the welding torch and conductive block can be stored. This allows the welder to access the welding torch and conductive block without using tools while performing welding operations at the pouring station. When not welding, this prevents the welding torch and conductive block from drooping and interfering with other operations.

[0014] Preferably, a fork connected to the bracket is also included, which rests on the suspension ring closest to the welding machine. This prevents damage caused by excessive pulling on the connection between the welding machine input cable and the welding machine when the input cable is retracted or separated.

[0015] Preferably, the welding machine is equipped with a current adjustment knob and a welding machine scale surrounding the current adjustment knob. The current adjustment knob has a welding machine pointer, and the scale value on the welding machine scale aligned with the welding machine pointer is the output current value of the welding machine. The lower end of the bracket is equipped with a bracket knob and a bracket scale surrounding the bracket knob. The bracket knob has a bracket pointer, and the scale value on the bracket scale aligned with the bracket pointer is the same as the scale value on the welding machine scale aligned with the welding machine pointer. The bracket knob is connected to the current adjustment knob via a transmission mechanism. When the bracket knob rotates, it drives the current adjustment knob to rotate through the transmission mechanism. The angular velocity of the bracket knob during rotation is equal to the angular velocity of the current adjustment knob driven by the bracket knob. When the welder performs welding operations at the pouring station, he can rotate to the bracket knob without using any tools. It allows for convenient adjustment of the current of welding machines located at high positions.

[0016] Preferably, the transmission mechanism includes a synchronous belt, a synchronous pulley for the welding machine section connected to the current adjustment knob, and a synchronous pulley for the hanger section connected to the hanger section knob. The synchronous pulley for the welding machine section and the synchronous pulley for the hanger section are connected together by the synchronous belt.

[0017] The beneficial effects of this invention are: it saves effort when pulling out adjacent core molds; and the input wires of the welding machine will not be dragged on the ground and damaged. Attached Figure Description

[0018] Figure 1 This is a side view schematic diagram of the present invention;

[0019] Figure 2 for Figure 1 A magnified view of a portion of point A;

[0020] Figure 3 for Figure 1 A magnified view of a portion of point E;

[0021] Figure 4 Rear view of the power supply structure for the welding torch;

[0022] Figure 5 A schematic diagram showing the box girder core mold located inside the box girder;

[0023] Figure 6 for Figure 5 A magnified view of a portion of point G.

[0024] In the diagram: Bottom template 1, Side template 2, End template 3, Left section of bottom plate 60, Right section of bottom plate 61, Left section of top plate 62, Right section of top plate 63, Upper section of left side plate 64, Lower section of left side plate 65, Upper section of right side plate 66, Lower section of right side plate 67, Bottom plate hinge 68, Left side plate hinge 69, Right side plate hinge 70, Left vertical cylinder 71, Right vertical cylinder 72, Longitudinal slide groove 73, Supporting ball 74, Connecting ear of right section of top plate 75, Connecting ear of left section of top plate 76, Upper section of left side plate 77, Lower section of left side plate 78, Upper section of right side plate 79, Right side 80 connecting lugs for the lower section of the plate, 81 connecting lugs for the end template, 82 fixing bolts for the end template, 94 longitudinal slide rails, 95 longitudinal suspension cables, 96 electric welding machine, 97 hanging bracket, 98 electric welding machine input wire, 99 positive output wire, 100 negative output wire, 101 conductive block, 102 welding torch, 118 storage frame, 103 hanging ring, 104 shift fork, 105 current adjustment knob, 106 dial for the electric welding machine, 107 pointer for the electric welding machine, 108 knob for the hanging bracket, 109 dial for the hanging bracket, 110 pointer for the hanging bracket, 111 synchronous belt, 120 box girder, 122 box girder core mold. Detailed Implementation

[0025] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0026] See Figures 1 to 6A box girder casting device with a retractable box girder core mold structure includes a welding torch power supply structure, an outer box girder mold, and a box girder core mold 122. The outer box girder mold includes a bottom template plate 1, two side templates 2 detachably connected to the transverse ends of the bottom template, and two end templates 3 detachably connected to the longitudinal ends of the bottom template. The bottom template plate, the two side templates, and the two end templates form a box girder cavity, and the box girder core mold is used to form the inner cavity of the box girder. When the outer box girder mold is assembled, the end templates are fitted onto the box girder core mold, the end templates are sealed against the end faces of the side templates, and the end templates are sealed against the upper surface of the bottom template. The box girder core mold is a tubular structure formed by a core mold bottom plate, a core mold top plate, a core mold left side plate, and a core mold right side plate. The core mold base plate includes a left section 60 and a right section 61; the core mold top plate includes a left section 62 and a right section 63; the core mold left side plate includes an upper left section 64 and a lower left section 65; and the core mold right side plate includes an upper right section 66 and a lower right section 67. The left and right sections of the base plate are connected by several base plate hinges 68. The left end face of the right section of the base plate and the right end face of the left section of the base plate are engaged and abutted together, with the left end face of the right section of the base plate pressing against the right end face of the left section of the base plate. The base plate hinges are located inside the box girder core mold. The left and right sections of the top plate can be separated and abutted together, with the right end face of the left section of the top plate and the left end face of the right section of the top plate engaged by an inclined surface, and the right end face of the left section of the top plate is located above the left end face of the right section of the top plate. The upper and lower sections of the left side plate are connected by several left side plate hinges 69. The lower end face of the upper left side plate and the upper end face of the lower left side plate abut together. The left side plate hinges are located inside the box girder core mold. The upper and lower sections of the right side plate are connected by several right side plate hinges 70. The lower end face of the upper right side plate and the upper end face of the lower right side plate abut together. The right side plate hinges are located inside the box girder core mold. The left section of the bottom plate is fixedly connected to the lower section of the left side plate. The upper left side plate is fixedly connected to the left section of the top plate. The right section of the top plate is fixedly connected to the upper right side plate. The lower right side plate is fixedly connected to the right section of the bottom plate. The lower sections of the left and right sides plate are connected by a lateral telescopic structure, which drives the lower sections of the left and right sides plate to rotate about the bottom plate hinge. The bottom plate and the top plate are connected by a vertical telescopic structure. The vertical telescopic structure is used to drive the right section of the top plate to rotate about the right side plate hinge and to drive the left section of the top plate to rotate about the left side plate hinge. When the core mold of the box girder retracts inward, the movement trajectories of the right section of the top plate, the left section of the top plate, the upper left section of the left side plate, the lower left section of the left side plate, the upper right section of the right side plate, the lower left section of the left side plate, the left section of the bottom plate, and the right section of the bottom plate are all located within the space enclosed by the inner circumference of the box girder.The vertical telescopic structure includes a left vertical cylinder 71 and a right vertical cylinder 72. The cylinder body of the right vertical cylinder is hinged to the inner surface of the right section of the bottom plate via a right longitudinal lower hinge shaft, and the piston rod of the right vertical cylinder is hinged to the inner surface of the right section of the top plate via a right longitudinal upper hinge shaft. The cylinder body of the left vertical cylinder is hinged to the inner surface of the left section of the bottom plate via a left longitudinal lower hinge shaft, and the piston rod of the left vertical cylinder is hinged to the inner surface of the left section of the top plate via a left longitudinal upper hinge shaft. When closing the box girder core mold, the right vertical cylinder retracts first, followed by the left vertical cylinder. The lateral telescopic structure consists of lateral cylinders. The left end of the lateral cylinder is hinged to the inner surface of the lower section of the left side plate via a longitudinal left hinge shaft, and the right end is hinged to the inner surface of the lower section of the right side plate via a longitudinal right hinge shaft. The box girder core mold also includes a longitudinal groove 73. Both the inner and outer surfaces of the longitudinal groove are arc surfaces. The centerline of the cylinder containing the inner surface of the longitudinal groove is the axis of the hinge in the bottom plate. The cylinder containing the inner surface of the longitudinal groove and the cylinder containing the outer surface of the longitudinal groove are coaxial. The left end of the longitudinal groove passes through the lower surface of the left section of the bottom plate, and the right end passes through the lower surface of the right section of the bottom plate. At least one row of supporting balls is provided on the lower surface of the left section of the bottom plate. The supporting balls 74 in the same row are distributed longitudinally, and the supporting balls support the inner surface of the longitudinal groove. The inner surface of the right section of the top plate is provided with a connecting ear 75 for the right section of the top plate, the inner surface of the left section of the top plate is provided with a connecting ear 76 for the left section of the top plate, the inner surface of the upper section of the left side plate is provided with a connecting ear 77 for the upper section of the left side plate, the inner surface of the lower section of the left side plate is provided with a connecting ear 78 for the lower section of the left side plate, the inner surface of the upper section of the right side plate is provided with a connecting ear 79 for the upper section of the right side plate, and the inner surface of the lower section of the right side plate is provided with a connecting ear 80 for the lower section of the right side plate. The end template is provided with a number of end template connecting ears 81. A number of end template fixing bolts 82 pass through the end template connecting ears one by one and are threaded onto the connecting ears of the right section of the top plate, the connecting ears of the left section of the top plate, the connecting ears of the upper section of the left side plate, the connecting ears of the lower section of the left side plate, the connecting ears of the upper section of the right side plate, and the connecting ears of the lower section of the right side plate, so that the end faces of the end template and the side template abut together.

[0027] The method for removing the box girder core mold after the end template is removed is as follows: The right vertical cylinder retracts, driving the right end of the top plate to rotate inwards about the right side plate hinge, thus detaching the right section of the top plate and the upper section of the right side plate from the box girder; the left vertical cylinder retracts, driving the left end of the top plate to rotate inwards about the left side plate hinge, thus detaching the left section of the top plate and the upper section of the left side plate from the box girder; the transverse cylinder retracts, driving the lower sections of the left and right sides plate to rotate inwards about the bottom plate hinge. This process causes the lower sections of the left side plate, the left section of the bottom plate, the lower section of the right side plate, and the right section of the bottom plate to detach from the box girder; the transverse cylinder extends and resets, lifting the longitudinal slide rail to detach it from the box girder (this method avoids deformation and breakage of the longitudinal slide rail during lifting, preventing it from detaching and being reused, as the longitudinal slide rail is still pressed down by the box girder core mold at three points along the transverse direction); the transverse cylinder retracts to a set length; the box girder core mold is pulled longitudinally to remove the adjacent core mold from the box girder; and the longitudinal slide rail is removed.

[0028] The welding torch power supply structure includes a longitudinal slide rail 94, a longitudinal suspension cable 95, a welding machine 96, a bracket 97 that can slide and be suspended on the longitudinal slide rail, and a welding machine input wire 98 connected to the welding machine at one end. The welding machine is fixed on the bracket. The longitudinal slide rail has a polygonal cross-section. The welding machine has a positive output wire 99 and a negative output wire 100. A conductive block 101 is connected to the end of the negative output wire, and the welding torch 102 is connected to the positive output wire. A storage frame 118 is provided at the lower end of the bracket, and the welding torch and conductive block are stored in the storage frame. When the welder is performing welding operations at the pouring station, he can retrieve the welding torch and conductive block without using tools. A suspension ring 103 is fixed to the welding machine input wire, distributed along the extension direction of the welding machine input wire. The suspension ring is sleeved on the longitudinal suspension cable and is a circular ring. In use, the other end of the welding machine input wire is connected to a power source to supply power to the welding machine. It also includes a fork 104 connected to the bracket, which rests on the suspension ring closest to the welding machine. The welding machine has a current adjustment knob 105 and a welding machine scale 106 surrounding the current adjustment knob. The current adjustment knob has a welding machine pointer 107, and the scale value on the welding machine scale aligned with the welding machine pointer is the output current value of the welding machine. The lower end of the bracket has a bracket knob 108 and a bracket scale 109 surrounding the bracket knob. The bracket knob has a bracket pointer 110, and the scale value on the bracket scale aligned with the bracket pointer is the same as the scale value on the welding machine scale aligned with the welding machine pointer. The mounting bracket knob is connected to the current adjustment knob via a transmission mechanism. When the mounting bracket knob rotates, it drives the current adjustment knob to rotate through the transmission mechanism. The angular velocity of the mounting bracket knob during rotation is equal to the angular velocity of the current adjustment knob driven by the mounting bracket knob. The transmission mechanism includes a synchronous belt 111, a welding machine synchronous pulley connected to the current adjustment knob, and a mounting bracket synchronous pulley connected to the mounting bracket knob. The welding machine synchronous pulley and the mounting bracket synchronous pulley are connected together by the synchronous belt. The welder can rotate the mounting bracket knob without using tools when performing welding operations at the pouring station.

Claims

1. A box girder casting device with a retractable box girder core mold structure, comprising an outer box girder mold and a core mold, wherein the outer box girder mold includes a bottom template, two side templates detachably connected to the transverse ends of the bottom template, and two end templates detachably connected to the longitudinal ends of the bottom template, the bottom template, the two side templates, and the two end templates forming a box girder cavity, and the core mold forming the inner cavity of the box girder, characterized in that, It also includes a welding torch power supply structure. The box girder core mold is a tubular structure formed by a core mold bottom plate, a core mold top plate, a core mold left side plate, and a core mold right side plate. The core mold bottom plate includes a left section and a right section, the core mold top plate includes a left section and a right section, the core mold left side plate includes an upper left section and a lower left section, and the core mold right side plate includes an upper right section and a lower right section. The left and right sections of the bottom plate are connected together by several bottom plate hinges. The right end face of the left section and the left end face of the right section abut together. The bottom plate hinges are located inside the box girder core mold. The left and right sections of the top plate can be separated and joined. The left side plate and the lower left side plate are connected together by several left side plate hinges. The lower end face of the upper left side plate and the upper end face of the lower left side plate abut together. The left side plate hinges are located inside the box girder core mold. The right side plate and the lower right side plate are connected together by several right side plate hinges. The lower end face of the upper right side plate and the upper end face of the lower right side plate abut together. The right side plate hinges are located inside the box girder core mold. The left section of the bottom plate is fixedly connected to the lower left side plate. The upper left side plate is fixedly connected to the left section of the top plate. The right section of the top plate and the upper right side plate are fixedly connected together. The lower right side plate is fixedly connected to the right section of the bottom plate. The lower sections of the left and right sides of the box girder are connected by a lateral telescopic structure, which drives both sections to rotate about the bottom plate hinge. The bottom plate and top plate of the core mold are connected by a vertical telescopic structure, which drives the right section of the top plate to rotate about the right plate hinge and the left section of the top plate to rotate about the left plate hinge. When the box girder core mold retracts inward, the movement trajectories of the right and left sections of the top plate, the upper and lower sections of the left and right sides of the box girder, the upper and lower sections of the left and right sides of the bottom plate are all within the space enclosed by the inner circumference of the box girder. The welding torch power supply structure includes a longitudinal slide rail, a longitudinal suspension cable, an electric welding machine, a bracket that can be slidably suspended on the longitudinal slide rail, and an electric welding machine input wire connected to the electric welding machine at one end. The electric welding machine is fixed on the bracket. The electric welding machine has a positive output wire and a negative output wire. The end of the negative output wire is connected to a conductive block. The positive output wire is connected to the welding torch. A suspension ring is fixed to the electric welding machine input wire and distributed along the extension direction of the electric welding machine input wire. The suspension ring is sleeved on the longitudinal suspension cable. When in use, the other end of the electric welding machine input wire is connected to a power source to input electricity to the electric welding machine.

2. The box girder casting device with a retractable box girder core mold structure according to claim 1, characterized in that, The vertical telescopic structure includes a left vertical cylinder and a right vertical cylinder. The cylinder body of the right vertical cylinder is hinged to the inner surface of the right section of the base plate via a right longitudinal lower hinge shaft, and the piston rod of the right vertical cylinder is hinged to the inner surface of the right section of the top plate via a right longitudinal upper hinge shaft. The cylinder body of the left vertical cylinder is hinged to the inner surface of the left section of the base plate via a left longitudinal lower hinge shaft, and the piston rod of the left vertical cylinder is hinged to the inner surface of the left section of the top plate via a left longitudinal upper hinge shaft. The lateral telescopic structure includes a lateral cylinder. The left end of the lateral cylinder is hinged to the inner surface of the lower section of the left side plate via a longitudinal left hinge shaft, and the right end is hinged to the inner surface of the lower section of the right side plate via a longitudinal right hinge shaft.

3. The box girder casting device with a retractable box girder core mold structure according to claim 2, characterized in that, The left end face of the right section of the top plate and the right end face of the left section of the top plate are fitted together and abutted together.

4. The box girder casting device with a retractable box girder core mold structure according to claim 1, 2, or 3, characterized in that, It also includes a longitudinal slide, the inner and outer surfaces of which are both arc surfaces. The center line of the cylinder on which the inner surface of the longitudinal slide is located is the axis of the hinge of the base plate. The cylinder on which the inner surface of the longitudinal slide is located and the cylinder on which the outer surface of the longitudinal slide are located are coaxial. The left end of the longitudinal slide passes through the lower surface of the left section of the base plate and the right end passes through the lower surface of the right section of the base plate.

5. The box girder casting device with a retractable box girder core mold structure according to claim 4, characterized in that, The left end face of the right section of the base plate and the right end face of the left section of the base plate are engaged and abutted together. The left end face of the right section of the base plate presses on the right end face of the left section of the base plate. At least one row of support balls is provided on the lower surface of the left section of the base plate. The support balls in the same row of support balls are distributed longitudinally. The support balls are supported on the inner surface of the longitudinal groove.

6. The box girder casting device with a retractable box girder core mold structure according to claim 1, 2, or 3, characterized in that, When the outer formwork of the box girder is assembled, the end template is fitted onto the core formwork of the box girder. The end template is sealed against the end face of the side template and the upper surface of the end template. The inner surface of the right section of the top plate is provided with a connecting ear for the right section of the top plate, the inner surface of the left section of the top plate is provided with a connecting ear for the left section of the top plate, the inner surface of the upper section of the left side plate is provided with a connecting ear for the upper section of the left side plate, the inner surface of the lower section of the left side plate is provided with a connecting ear for the lower section of the left side plate, the inner surface of the upper section of the right side plate is provided with a connecting ear for the upper section of the right side plate, and the inner surface of the lower section of the right side plate is provided with a connecting ear for the lower section of the right side plate. The end template is provided with a plurality of end template connecting ears. A plurality of end template fixing bolts pass through the end template connecting ears one by one and are threaded onto the connecting ears for the right section of the top plate, the left section of the top plate, the upper section of the left side plate, the lower section of the left side plate, the upper section of the right side plate, and the lower section of the right side plate, so that the end template abuts against the end face of the side template.

7. The box girder casting device with a retractable box girder core mold structure according to claim 1, 2, or 3, characterized in that, It also includes a fork connected to the hanger, the fork resting on the suspension ring closest to the welding machine.

8. The box girder casting device with a retractable box girder core mold structure according to claim 1, 2, or 3, characterized in that, The welding machine is equipped with a current adjustment knob and a welding machine scale surrounding the current adjustment knob. The current adjustment knob has a welding machine pointer, and the scale value on the welding machine scale aligned with the welding machine pointer is the output current value of the welding machine. The lower end of the bracket has a bracket knob and a bracket scale surrounding the bracket knob. The bracket knob has a bracket pointer, and the scale value on the bracket scale aligned with the bracket pointer is the same as the scale value on the welding machine scale aligned with the welding machine pointer. The bracket knob is connected to the current adjustment knob through a transmission mechanism. When the bracket knob rotates, it drives the current adjustment knob to rotate through the transmission mechanism. The angular velocity of the bracket knob when rotating is equal to the angular velocity of the current adjustment knob when driven by the bracket knob. When the welder is performing welding operations at the pouring station, he can rotate to the bracket knob without using tools.

9. The box girder casting device with a retractable box girder core mold structure according to claim 8, characterized in that, The transmission mechanism includes a synchronous belt, a synchronous pulley for the welding machine section connected to the current adjustment knob, and a synchronous pulley for the hanging rack section connected to the hanging rack section knob. The synchronous pulley for the welding machine section and the synchronous pulley for the hanging rack section are connected together by the synchronous belt.

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