A prefabricated box culvert combined formwork and formwork system

Abstract

The utility model relates to box culvert construction technical field, especially a prefabricated box culvert combined template and template system, prefabricated box culvert combined template includes: folding inner mould subassembly, support frame is used for supporting folding inner mould subassembly, and the bottom of support frame is equipped with the passageway for the access of lifting trolley, and the top of passageway is equipped with bracket, lifting mechanism sets up between folding inner mould subassembly and support frame, and lifting mechanism is used for driving folding inner mould subassembly to lift relative to support frame. The prefabricated box culvert combined template of the utility model does not need to set up the walking wheel of big cost and easy to damage under support frame, is favorable for reducing the manufacturing cost of support frame and prolonging its service life, also is favorable for improving the vertical load capacity of support frame, and moreover, the prefabricated box culvert combined template is removed and transported by lifting trolley, and the same lifting trolley can remove and transport multiple prefabricated box culvert combined templates in batches, which can reduce the construction cost as a whole.

Description

Technical Field

[0001] This utility model relates to the field of box culvert construction technology, and in particular to a prefabricated box culvert combined formwork and formwork system. Background Technology

[0002] The inner formwork of a box culvert is a key temporary structure used to form the internal cavity during the concrete pouring process. The inner formwork works in conjunction with the outer formwork to serve as the casting template for the box culvert. Unlike the outer formwork, the inner formwork is located in a closed space, which restricts its installation, reinforcement, and dismantling. In existing products, some inner formworks do not have a walking function and require their components to be disassembled and transported out separately, which significantly increases the construction period. In addition, some inner formworks move by using wheels set at the bottom of the support frame, which requires laying tracks on the ground in advance for the wheels to travel on. This results in poor flexibility during movement, and the wheels also reduce the vertical load-bearing capacity of the support frame to some extent. Utility Model Content

[0003] This utility model provides a precast box culvert combined formwork and formwork system, which aims to solve, at least to some extent, the problem of balancing convenient movement of the inner formwork of the box culvert with high load-bearing capacity.

[0004] In a first aspect, this utility model provides a precast box culvert assembly template, comprising: Foldable inner mold assembly; A support frame is provided to support the foldable inner mold assembly. The bottom of the support frame is provided with a channel for the lifting trolley to enter and exit, and the top of the channel is provided with a bracket. A lifting mechanism is disposed between the foldable inner mold assembly and the support frame, and the lifting mechanism is used to drive the foldable inner mold assembly to rise and fall relative to the support frame.

[0005] In some embodiments, the foldable inner mold assembly includes a top mold and two side molds, the two side molds being rotatably connected to both sides of the top mold.

[0006] In some embodiments, the support frame supports the top mold, and a crossbeam is provided between the support frame and the top mold, with both ends of the crossbeam protruding from both sides of the support frame.

[0007] In some embodiments, a telescopic mechanism is further included, one end of which is connected to the crossbeam and the other end to the side mold, the telescopic mechanism being used to drive the side mold to rotate relative to the top mold.

[0008] In some embodiments, the foldable inner mold assembly has a casting state and a shrinkage state: In the pouring state, the telescopic mechanism extends, the lifting mechanism lifts, and the foldable inner mold assembly is used as the inner mold for box culvert pouring; In the contracted state, the telescopic mechanism shortens, the lifting mechanism retracts, and the foldable inner mold assembly can be removed from the cast-in-place box culvert.

[0009] In some embodiments, a limiting member is provided at the bottom of the crossbeam, and a limiting groove is provided at the upper part of the support frame. The limiting member extends at least partially into the limiting groove, and the limiting member and the limiting groove cooperate to restrict the crossbeam from moving relative to the support frame in the lifting direction perpendicular to the lifting mechanism.

[0010] In some embodiments, the side mold includes a main body section and a bending section, with an included angle α between the main body section and the bending section, where 0° < α < 90°, and the end of the bending section away from the main body section is hinged to the top mold.

[0011] In some embodiments, the support frame includes at least two rows of support legs for supporting the ground or the bottom plate of the box culvert, and the bracket is disposed between the two rows of support legs, the support legs and the bracket forming a passage for the lifting platform vehicle to enter and exit.

[0012] In a second aspect, the present invention provides a precast box culvert formwork system, including a lifting platform and a precast box culvert combined formwork as described above.

[0013] In some embodiments, the lifting platform has a first state and a second state: In the first state, the lifting platform vehicle can drive into and out of the channel at the bottom of the support frame; In the second state, the lifting platform lifts the support frame.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: The precast box culvert assembly formwork described in this utility model, by setting a channel for the entry and exit of the lifting platform trolley and a bracket for the lifting platform trolley to lift it at the bottom of the support frame, allows the lifting platform trolley to drive into the channel and support the bracket to lift the precast box culvert assembly formwork. The lifting platform trolley then transfers and transports the precast box culvert assembly formwork to the designated location. This eliminates the need for costly and easily damaged wheels at the bottom of the support frame, which helps reduce the manufacturing cost of the support frame and extend its service life, as well as improve the vertical load-bearing capacity of the support frame. Moreover, by using the lifting platform trolley to move the precast box culvert assembly formwork, the same lifting platform trolley can move multiple precast box culvert assembly formworks in multiple trips, which can reduce the overall construction cost. After being moved to the designated location, the lifting platform can lower the support frame to the ground. By setting a lifting mechanism between the support frame and the folding inner mold assembly, the lifting mechanism can raise the folding inner mold assembly to a preset height for use as the inner mold for box culvert casting. After casting, the lifting mechanism can drive the folding inner mold assembly to descend, leaving space for the lifting platform to lift the precast box culvert assembly template, thereby removing the support frame and the folding inner mold assembly from the box culvert. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the prefabricated box culvert composite template (in retracted state) according to an embodiment of the present invention. Figure 2 for Figure 1 Enlarged view of section A in the middle; Figure 3 This is a structural schematic diagram (casting state) of the precast box culvert composite template described in an embodiment of this utility model. Figure 4 for Figure 3 Enlarged view of section B; Figure 5 This is a schematic diagram of the concrete pouring process for the box culvert as described in an embodiment of this utility model; Figure 6 This is a side view of the support frame and lifting platform trolley described in an embodiment of the present utility model.

[0016] Marked in the image: 1- Foldable inner mold assembly; 11-Top mold; 12-Side mold; 121-Main body section; 122-Bending section; 2-Support frame; 21-Channel; 22-Limiting groove; 23-Support leg; 24-Bracket; 3- Lifting mechanism; 4-Crossbeam; 41-Limiting component; 5-Telescopic mechanism; 6- Lifting platform trolley; 7-Hydraulic station; 8-Box culvert outer formwork. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0018] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0019] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0020] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0021] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0022] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0023] The present invention will now be described in conjunction with the accompanying drawings and specific embodiments: In a first aspect, the present invention provides a prefabricated box culvert assembly template, including a foldable inner mold assembly 1 and a support frame 2. The foldable inner mold assembly 1 can be used as the inner mold of the box culvert, and the support frame 2 is used to support the foldable inner mold assembly 1.

[0024] The foldable inner mold assembly 1 is a box culvert inner mold with a folding function. It can reduce its lateral dimension by folding to form a lateral gap between the foldable inner mold assembly 1 and the cast box culvert, so as to facilitate the removal of the foldable inner mold assembly 1 from the box culvert without damaging the box culvert. The support frame 2 can be set inside the foldable inner mold assembly 1 to support the foldable inner mold assembly 1 and enable the foldable inner mold assembly 1 to reach a predetermined height.

[0025] In some embodiments, to improve the vertical bearing capacity of the support frame 2, the support frame 2 is not equipped with wheels at the bottom, but is directly supported on the ground or the bottom plate of the box culvert by components such as support legs 23. On this basis, to facilitate the movement of the precast box culvert assembly template, the bottom of the support frame 2 is provided with a channel 21 for the lifting trolley 6 to enter and exit. The top of the channel 21 is provided with a bracket 24, so that the lifting trolley 6 can drive into the bottom area of ​​the support frame 2 along the channel 21, and use the lifting function of the lifting trolley 6 to support the bracket 24 to lift the precast box culvert assembly template, so that the support frame 2 leaves the ground or the bottom plate of the box culvert, and then the lifting trolley 6 drives the precast box culvert assembly template to move.

[0026] In addition, the lower part of the support frame 2 does not need to be equipped with costly and easily damaged traveling wheels, which helps to reduce the manufacturing cost of the support frame 2 and extend its service life; the lifting platform 6 can drive into and out of the passage 21, and the same lifting platform 6 can transport multiple precast box culvert combination templates in multiple times. In the same project, only a few lifting platform 6 are needed to meet the transportation needs of multiple precast box culvert combination templates. Moreover, the lifting platform 6 can adapt to box culvert templates of different sizes and can be used interchangeably between different box culvert templates in different projects, which can significantly reduce the overall construction cost.

[0027] In some embodiments, the support frame 2 includes at least two rows of support legs 23, and a bracket 24 is disposed between the two rows of support legs 23. The support legs 23 and the bracket 24 enclose a channel 21 for the lifting platform 6 to enter and exit. The bottom of the channel 21 is open, allowing the lifting platform 6 to drive into and out of the channel 21. The support legs 23 and the bracket 24 can be made of structural steel, such as I-beams, square steel, etc. The width of the lifting platform 6 is smaller than the distance between the two rows of support legs 23.

[0028] Exemplary, combined Figure 1 and Figure 3 The support frame 2 includes two rows of horizontally spaced vertical steel sections, as well as upper and lower horizontal braces connecting the corresponding vertical steel sections. The bottom of the vertical steel sections is used to support the ground or the bottom plate of the box culvert. The lower horizontal brace can serve as a bracket 24. In the longitudinal direction, adjacent vertical steel sections can be connected by longitudinal connecting beams, vertical braces and diagonal braces to form the support frame 2 into an integral structure.

[0029] Optionally, the length of the lifting platform 6 is less than the length of the support frame 2, which makes the lifting platform 6 more maneuverable and helps to reduce the difficulty of moving the support frame 2.

[0030] The lifting platform 6 can be a transport trolley with lifting function, such as an electric flatcar with lifting function in the prior art. Compared with the traveling wheels set at the bottom of the support frame 2, the lifting platform 6 has relatively low carrying capacity requirements. It only needs to be able to lift and move the precast box culvert assembly formwork, without bearing the concrete load. In terms of selection, a small electric flatcar can be used, which helps to reduce the size and cost of the lifting platform 6. Exemplarily, the lifting platform 6 includes a frame, wheels, a lifting platform, a lifting drive system, a transmission system, and an electric control system. The wheels are connected to the frame and can roll on the ground. The transmission system is used to drive the wheels to roll so as to move the frame. The lifting platform is set on the frame. The lifting drive system is used to drive the lifting platform to rise and fall relative to the frame, so that the lifting platform top support bracket 24 can lift the support frame 2 and the folding inner mold assembly 1. The electric control system is used to control the lifting drive system and the transmission system.

[0031] In some embodiments, a lifting mechanism 3 is provided between the folding inner mold assembly 1 and the support frame 2. The lifting mechanism 3 is used to drive the folding inner mold assembly 1 to rise and fall relative to the support frame 2, so as to adjust the vertical height of the folding inner mold assembly 1 relative to the support frame 2. On the one hand, by reducing the vertical height of the folding inner mold assembly 1 relative to the support frame 2, a vertical gap can be left between the folding inner mold assembly 1 and the cast box culvert, leaving space for the lifting platform 6 to lift the precast box culvert assembly template, and facilitating the removal of the folding inner mold assembly 1 from the box culvert without damaging it. On the other hand, by increasing the vertical height of the folding inner mold assembly 1 relative to the support frame 2, the folding inner mold assembly 1 can reach a predetermined height for the box culvert concrete pouring.

[0032] Optionally, the lifting mechanism 3 is a hydraulic rod, which includes a cylinder and a piston that are movably connected. The piston can extend and retract relative to the cylinder to achieve the telescopic function. The cylinder and piston of the hydraulic rod can be connected to the support frame 2 and the folding inner mold assembly 1, respectively. The telescopic direction of the hydraulic rod can be vertical, thereby driving the folding inner mold assembly 1 to rise and fall relative to the support frame 2 through the hydraulic rod.

[0033] Combination Figure 1 and Figure 3 In some embodiments, the foldable inner mold assembly 1 includes a top mold 11 and two side molds 12, which are rotatably connected to both sides of the top mold 11, and the side molds 12 can rotate relative to the top mold 11 to achieve the folding function.

[0034] The top formwork 11 may include a top template and a first longitudinal connector. The first longitudinal connector may be a channel steel. The first longitudinal connector is disposed on the inner side of the top template, and the outer side of the top template is used as the template for the top slab of the box culvert. The side formwork 12 may include a side template and a second longitudinal connector. The second longitudinal connector may be a channel steel. The second longitudinal connector is disposed on the inner side of the side template, and the outer side of the side template is used as the template for the side wall of the box culvert.

[0035] The included angle between the side formwork 12 and the top formwork 11 can be determined according to the shape of the box culvert. Optionally, the side formwork 12 can be rotated to be perpendicular to the top formwork 11 so that the top and side surfaces of the cast box culvert are perpendicular. After the box culvert concrete is poured and reaches a certain strength, the side formwork 12 can be rotated inward to detach from the box culvert concrete, thereby leaving a gap between the side formwork 12 and the side wall of the box culvert to facilitate the removal of the foldable inner formwork assembly 1.

[0036] Combination Figure 4 Furthermore, in order to ensure that the side formwork 12 can be completely detached from the box culvert concrete and that the side formwork 12 will not collide with the box culvert concrete during rotation, the side formwork 12 includes a main body section 121 and a bent section 122. The main body section 121 and the bent section 122 have an included angle α, where 0° < α < 90°. The end of the bent section 122 away from the main body section 121 is hinged to the top formwork 11.

[0037] Specifically, angle α is the angle between the outer surfaces of the main body segment 121 and the bending segment 122, and the outer surface refers to the surface of the folded inner mold assembly 1 facing the concrete of the box culvert; combined with Figure 4 , Figure 4 As shown in the cross-sectional diagram, during the actual folding process, the side formwork 12 is first rotated around the hinge point to fold the side formwork 12. After the concrete strength of the top slab meets the demolding requirements, the top formwork 11 is then lowered. During the rotation of the side formwork 12, the paths of each point on the outer surface of the side formwork 12 around the hinge point do not intersect with the inner wall of the box culvert, which can effectively prevent the folding inner formwork assembly 1 from bumping into the box culvert concrete.

[0038] In addition, the bending section 122 can also form a chamfer between the top surface and the side of the inner side of the box culvert.

[0039] Optionally, 30° < a < 60°, and further, a = 45°.

[0040] In some embodiments, the support frame 2 supports the top mold 11.

[0041] In some embodiments, based on the above, in order to better support the top mold 11 with a large lateral dimension, a crossbeam 4 is provided between the support frame 2 and the top mold 11. The crossbeam 4 is supported and connected to the support frame 2, and the two ends of the crossbeam 4 protrude from both sides of the support frame 2 to support the top mold 11 outside the range of the support frame 2.

[0042] Optionally, several crossbeams 4 are arranged at intervals along the length of the support frame 2, and the crossbeams 4 are connected to the first longitudinal connecting member.

[0043] In some embodiments, the precast box culvert assembly template also includes a telescopic mechanism 5 for driving the side mold 12 to rotate relative to the top mold 11.

[0044] Optionally, the telescopic mechanism 5 is a hydraulic rod, and the two ends of the telescopic mechanism 5 are hinged.

[0045] In some embodiments, based on the above, one end of the telescopic mechanism 5 is connected to the crossbeam 4 and the other end is connected to the side mold 12. The reaction force of the telescopic mechanism 5 when pushing, pulling and supporting the side mold 12 will be applied to the crossbeam 4. Since the crossbeam 4 has been designed to bear a large vertical load, this part of the reaction force will not significantly increase the design load of the crossbeam 4. In the structural design, the crossbeam 4 has a large bearing capacity and can withstand a larger force. Moreover, it can evenly transmit the force to the lower support frame 2 and the side mold 12, resulting in more uniform force distribution and a more stable overall structure.

[0046] As is known to those skilled in the art, by connecting the telescopic mechanism 5 to the crossbeam 4, the force exerted on the crossbeam 4 by the telescopic mechanism 5 when pushing and pulling the side formwork 12, as well as the concrete pressure on the side formwork 12 during concrete pouring, can be directly applied to the crossbeam 4. Furthermore, the reaction force from the telescopic mechanism 5 resisting the concrete compression of the side formwork 12 on the crossbeam 4 can be partially balanced with the vertical pressure from the top formwork 11 and the upper concrete load, thereby reducing the vertical pressure that the support frame 2 ultimately needs to bear. Moreover, most of the forces on the support frame 2 are vertical, making it easy to meet the structural strength requirements of the support frame 2. In contrast, if the telescopic mechanism 5 is connected to the support frame 2, the telescopic mechanism 5 will exert a lateral force on the support frame 2, requiring additional components on the support frame 2 to resist this lateral force. This would increase the weight and cost of the support frame 2, reducing its economic efficiency and safety.

[0047] Optionally, the two telescopic mechanisms 5 are symmetrically distributed along the central axis of the folding inner mold assembly 1.

[0048] In some embodiments, based on the above, the foldable inner mold assembly 1 has a casting state and a shrinkage state: in the casting state, the telescopic mechanism 5 extends, the lifting mechanism 3 rises, and the foldable inner mold assembly 1 can be used as the inner mold for casting a box culvert; in the shrinkage state, the telescopic mechanism 5 shortens, the lifting mechanism 3 falls back, a gap exists between the foldable inner mold assembly 1 and the cast box culvert, and the foldable inner mold assembly 1 can be moved out of the box culvert. Please refer to [link to relevant documentation]. Figure 1 and Figure 3 , Figure 1 and Figure 3 The dashed lines in the diagram are used to indicate the inner surface of the box culvert. Figure 1 It is in a contracted state. Figure 3 It is in the pouring stage.

[0049] Combination Figure 2 In some embodiments, the bottom of the crossbeam 4 is provided with a limiting member 41, and the upper part of the support frame 2 is provided with a corresponding limiting groove 22. The depth direction of the limiting groove 22 can be parallel to the lifting direction of the lifting mechanism 3. The limiting member 41 extends at least partially into the limiting groove 22. The limiting groove 22 does not restrict the relative movement of the limiting member 41 in the lifting direction parallel to the lifting mechanism 3, but restricts the movement of the limiting member 41 in the lifting direction perpendicular to the lifting mechanism 3, thereby restricting the crossbeam 4 from moving relative to the support frame 2 in the lifting direction perpendicular to the lifting mechanism 3, thus playing the role of restricting the horizontal movement of the crossbeam 4.

[0050] Furthermore, the limiting member 41 is provided with a vertical strip-shaped perforation. When the foldable inner mold assembly 1 is raised to a predetermined height, a pin can be inserted into the vertical strip-shaped perforation outside the limiting groove 22. The vertical height of the pin is approximately the height of the vertical strip-shaped perforation outside the limiting groove 22, which is used to limit the descent of the crossbeam 4.

[0051] Optionally, the vertical steel of the support frame 2 is square steel, and the cavity of the square steel can be used as a limiting groove 22.

[0052] Combination Figure 5 and Figure 6 In a second aspect, this utility model provides a precast box culvert formwork system, including a lifting platform 6 and a precast box culvert combined formwork as described above.

[0053] In some embodiments, the top of the lifting platform 6 has a support portion, the height of which can be changed, and the lifting platform 6 has a first state and a second state: In the first state, the lifting platform 6 can drive into and out of the channel 21 at the bottom of the support frame 2; In the second state, the lifting platform 6 lifts the support frame 2.

[0054] Optionally, the precast box culvert formwork system also includes a hydraulic station 7, which is used to inject and discharge hydraulic oil into the hydraulic rods to control their extension and retraction lengths. Exemplarily, the hydraulic station 7 is mounted on the support frame 2 and is used to control the extension and retraction of the lifting mechanism 3 and the telescopic mechanism 5 respectively. The lifting trolley 6 can be controlled by a control handle and has straight-line travel, turning, and vertical lifting functions.

[0055] Optionally, it also includes a box culvert outer formwork 8, which is opposite to the folded inner formwork assembly 1. Further, box culvert reinforcing bars are provided between the box culvert outer formwork 8 and the folded inner formwork assembly 1.

[0056] In a third aspect, this utility model embodiment provides a precast box culvert construction method, including the following steps: The telescopic mechanism 5 is shortened and the lifting mechanism 3 is lowered, adjusting the folding inner mold assembly 1 to a retracted state. Adjust the lifting platform 6 to the first state, drive the lifting platform 6 into the channel 21 and stop in the bottom area of ​​the support frame 2; Adjust the lifting platform 6 to the second state so that the support frame 2 is off the ground, and the lifting platform 6 drives the precast box culvert assembly formwork to the pouring position; Adjust the lifting platform 6 to the first state so that the support frame 2 is lowered to the ground or the bottom plate of the box culvert; The telescopic mechanism 5 is extended and the lifting mechanism 3 is raised, adjusting the folded inner mold assembly 1 to the pouring state, and cooperating with the box culvert outer mold 8 to carry out the box culvert concrete pouring. After the box culvert concrete reaches a certain strength, the folding inner formwork assembly 1 is adjusted to the contracted state, and the lifting platform 6 in the bottom area of ​​the support frame 2 is adjusted to the second state, so that the support frame 2 leaves the ground or the bottom plate of the box culvert and a gap is left between the folding inner formwork assembly 1 and the box culvert concrete. The lifting platform 6 then moves the precast box culvert combined formwork out of the box culvert.

[0057] In some embodiments, after the lifting platform 6 moves the precast box culvert assembly template to the pouring position and lowers it, the lifting platform 6 can drive out from the passage 21 to transport other precast box culvert assembly templates.

[0058] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A precast box culvert assembly formwork, characterized in that, include: Foldable inner mold assembly (1); A support frame (2) is provided to support the foldable inner mold assembly (1). The bottom of the support frame (2) is provided with a channel (21) for the lifting trolley (6) to enter and exit. The top of the channel (21) is provided with a bracket (24). A lifting mechanism (3) is provided between the foldable inner mold assembly (1) and the support frame (2). The lifting mechanism (3) is used to drive the foldable inner mold assembly (1) to lift relative to the support frame (2).

2. The precast box culvert assembly template according to claim 1, characterized in that, The foldable inner mold assembly (1) includes a top mold (11) and two side molds (12), the two side molds (12) being rotatably connected to both sides of the top mold (11).

3. The precast box culvert assembly template according to claim 2, characterized in that, The support frame (2) supports the top mold (11), and a crossbeam (4) is provided between the support frame (2) and the top mold (11). The two ends of the crossbeam (4) protrude from both sides of the support frame (2).

4. The precast box culvert assembly template according to claim 3, characterized in that, It also includes a telescopic mechanism (5), one end of which is connected to the crossbeam (4) and the other end is connected to the side mold (12). The telescopic mechanism (5) is used to drive the side mold (12) to rotate relative to the top mold (11).

5. The precast box culvert assembly formwork according to claim 4, characterized in that, The foldable inner mold assembly (1) has a casting state and a shrinkage state: In the pouring state, the telescopic mechanism (5) extends, the lifting mechanism (3) lifts, and the folding inner mold assembly (1) is used as the inner mold for box culvert pouring; In the contracted state, the telescopic mechanism (5) shortens, the lifting mechanism (3) retracts, and the folding inner mold assembly (1) can be removed from the cast box culvert.

6. The precast box culvert assembly template according to claim 3, characterized in that, The bottom of the crossbeam (4) is provided with a limiting member (41), and the upper part of the support frame (2) is provided with a corresponding limiting groove (22). The limiting member (41) extends at least partially into the limiting groove (22). The limiting member (41) and the limiting groove (22) cooperate to restrict the crossbeam (4) from moving relative to the support frame (2) in the lifting direction perpendicular to the lifting mechanism (3).

7. The precast box culvert assembly template according to claim 2, characterized in that, The side mold (12) includes a main body section (121) and a bending section (122), with an included angle α between the main body section (121) and the bending section (122), where 0° < α < 90°, and the end of the bending section (122) away from the main body section (121) is hinged to the top mold (11).

8. The precast box culvert assembly template according to any one of claims 1-7, characterized in that, The support frame (2) includes at least two rows of support legs (23), which are used to support the ground or the bottom plate of the box culvert. The bracket (24) is arranged between the two rows of support legs (23). The support legs (23) and the bracket (24) together form a passage (21) for the lifting platform (6) to enter and exit.

9. A precast box culvert formwork system, characterized in that, It includes a lifting platform (6) and a prefabricated box culvert assembly template as described in any one of claims 1-8.

10. The precast box culvert formwork system according to claim 9, characterized in that, The lifting platform (6) has a first state and a second state: In the first state, the lifting platform (6) can drive into and out of the channel (21) at the bottom of the support frame (2). In the second state, the lifting platform (6) lifts the support frame (2).

Images