Prefabricated box girder bottom die and assembling method thereof

Abstract

The invention provides a prefabricated box girder bottom die and an assembling method thereof, and belongs to the technical field of box girder construction, the prefabricated box girder bottom die comprises an end module, a first module, a second module and a clamping block, after the second module and the first module are connected in an inserting mode through an inserting hole and an inserting column, the clamping block is clamped into a clamping groove, the clamping block extrudes a locking piece in the clamping groove, and the clamping block is clamped into the clamping groove. When the box girder bottom die is assembled, the locking piece is clamped into the locking groove of the inserting column, so that the inserting column is locked, the inserting column can be locked while the second die block and the first die block are connected through clamping of one part of the clamping block, simultaneous locking in the X-axis direction, the Y-axis direction and the Z-axis direction of the box girder bottom die is achieved, the connecting firmness is improved, meanwhile, the disassembling and assembling steps are reduced, and the disassembling and assembling efficiency is improved; by cooling the second module, the end module and the clamping block before assembly, the gap is increased during assembly and is reduced after assembly is finished, so that the operation difficulty and the operation time of assembly are reduced, and the assembly gap is ensured to be qualified.

Description

Technical Field

[0001] This invention relates to the field of box girder construction technology, and more specifically, to a precast box girder bottom formwork and its assembly method. Background Technology

[0002] Currently, precast box girders are widely used in bridge construction because they can accelerate project progress and save construction time. When precasting box girders, it is usually necessary to build precast box girders near the bridge to be erected, and then carry out the precast box girders. After the precast box girders are completed, they can be erected to the construction site by a bridge erecting machine.

[0003] The existing Chinese utility model CN213499887U discloses a precast box girder bottom formwork, which is assembled from multiple small segments. After construction, the bottom formwork can be dismantled in sections and recycled, greatly reducing construction waste and improving the utilization rate of building materials. However, this precast box girder bottom formwork still has the following problems in use: The bottom formwork of the precast box girder requires two sets of bolts to fix it after the two modules are connected by plug-in blocks. On the one hand, the disassembly and assembly efficiency is low, and on the other hand, the bolt heads on the formwork surface affect the flatness of the precast box girder. Summary of the Invention

[0004] The purpose of this invention is to provide a precast box girder bottom formwork and its assembly method, so as to solve the problems mentioned in the background art of low bottom formwork assembly and disassembly efficiency and bolt heads on the formwork surface affecting flatness.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A precast box girder bottom formwork includes an end module, a first module, a second module, and a snap-fit ​​block. The first module and the second module have identical X-shaped cross-sections along the X-axis. The first module has a first snap-fit ​​groove on each side of its X-shaped step surface along its Y-axis, and several insertion posts are provided on the side steps of the first module, avoiding the first snap-fit ​​grooves. The second module has a second snap-fit ​​groove on each side of its X-shaped step surface along its Y-axis, and several insertion holes are provided on the side steps of the second module corresponding to the insertion hole positions. The first and second modules are arranged opposite each other and staggered. The front step surface of the first module abuts against the rear step surface of the second module. The insertion posts corresponding to the insertion positions are inserted into the insertion holes, and the first and second snap-fit ​​grooves together form the snap-fit ​​groove. The snap-fit ​​block engages with the snap-fit ​​groove to connect the first module and the second module.

[0006] Furthermore, both the first and second snap-fit ​​grooves are inverted T-shaped grooves, which together form an I-shaped snap-fit ​​groove, and the snap-fit ​​block is an I-beam corresponding to the size of the I-shaped snap-fit ​​groove.

[0007] Furthermore, the second snap-fit ​​groove sidewall is provided with a through hole corresponding to the insertion hole, and a locking piece is provided in the through hole. The front end of the locking piece extending out of the through hole is arc-shaped, and the rear end avoids the insertion hole and is connected to the body of the second module.

[0008] Furthermore, the locking block is provided with a matching arc-shaped groove at the position corresponding to the locking piece, and the front end of the locking piece is engaged in the arc-shaped groove after the locking block is engaged in the locking groove.

[0009] Furthermore, the plug is inserted into the plug hole, and the plug is provided with a locking groove. The openings of the locking grooves all face the second snap-fit ​​groove. The openings of the locking grooves correspond to the locking piece, and the locking piece will snap into the snap-fit ​​groove and lock the snap-fit ​​block.

[0010] Furthermore, the locking piece is fixedly connected to the body of the second module via two cylindrical connecting posts, bypassing the insertion hole.

[0011] Furthermore, the locking piece is retractably connected to the body of the second module via an elastic element, avoiding the insertion hole. The front end of the locking piece is squeezed by the snap-fit ​​block, and its rear end is snapped into the locking groove of the corresponding insertion post. When the front end of the locking piece is not squeezed by the snap-fit ​​block, its rear end leaves the locking groove of the insertion post due to the reset action of the elastic element.

[0012] Furthermore, the elastic element is a spring.

[0013] Furthermore, the end module is half of the second module or the first module, and is disposed at both ends of the bottom mold, and connected to the corresponding first module or the second module.

[0014] Furthermore, the assembly method for the bottom formwork of the precast box girder includes the following steps: S100. Site preparation: Clean and level the assembly site and mark the installation positions of each module according to the design requirements; S200, First Module Installation: Hoist all the first modules to their marked positions and clean the assembly surfaces; S300, Cooling treatment of the components to be installed: Cool the second module, the end module and the snap-fit ​​block, with the target temperature reduced by 30-35°C compared to the original temperature; S400, Second Module Installation: The second module is hoisted one by one between the corresponding two first modules and installed by insertion through the insertion holes and insertion posts; S500, End module installation: The end module is hoisted to the first and last ends of the first module and installed by plugging in the plug-in holes and plug-in posts; S600, Snap-fit ​​Block Installation: The snap-fit ​​block snaps into the snap-fit ​​groove, the front end of the locking piece snaps into the arc-shaped groove of the snap-fit ​​block, and the locking piece locks into the locking groove of the plug post. Installation is complete.

[0015] In summary, the beneficial effects of this invention are: This invention discloses a precast box girder bottom formwork. The precast box girder bottom formwork locks the X and Y axes by aligning several second modules end-to-end with the first module and connecting them through insertion holes and insertion posts. It also locks the X and Y axes by aligning end modules end-to-end with the first module and connecting them through insertion holes and insertion posts. Furthermore, it locks the X and Z axes by inserting a snap-fit ​​block into a snap-fit ​​groove. The snap-fit ​​block pushes a locking piece into the locking groove, simultaneously locking the X, Y, and Z axes of the box girder bottom formwork. Because the box girder bottom formwork is simultaneously locked in the X, Y, and Z axes, the connection between the bottom formwork modules is strengthened, effectively resisting the pressure generated during concrete pouring, maintaining the geometric stability of the formwork, and ensuring the flatness and dimensional accuracy of the box girder concrete structure. The bottom formwork of the box girder can be disassembled simply by plugging and unplugging the clips, which reduces the number of disassembly and assembly steps and improves disassembly efficiency. A locking plate is used to extend and retract to the body of the second module via an elastic element, bypassing the insertion hole. When the locking block is engaged in the locking groove, the front end of the locking plate is squeezed by the locking block, and its rear end is engaged in the locking groove of the corresponding insertion post, locking the second module and the first module. When the locking block is withdrawn from the locking groove, the front end of the locking plate is not squeezed by the locking block, and its rear end leaves the locking groove of the insertion post due to the reset action of the elastic element, making it easier to disassemble the second module and the first module. Meanwhile, the plug-in column on the first module is integrated with the first module, and there is no need to disassemble it. There are no protrusions on the surface. Therefore, the template surface of the assembled box girder bottom formwork has a high degree of flatness. By cooling the second module, end module, and snap-fit ​​block before assembly, the insertion hole is enlarged, increasing the gap between the insertion hole and the insertion post during assembly and decreasing it after assembly. Similarly, by cooling the snap-fit ​​block, the snap-fit ​​block is reduced in size, increasing the gap between the snap-fit ​​block and the snap-fit ​​groove during assembly and decreasing it after assembly. This reduces the difficulty and time of assembly while ensuring that the assembly gap is within acceptable limits. Attached Figure Description

[0016] Figure 1This is a three-dimensional schematic diagram of the assembly of the first module, the second module, and the snap-fit ​​block of the precast box girder bottom mold of the present invention; Figure 2 This is a cross-sectional view of the first and second modules of the precast box girder bottom mold of the present invention. Figure 3 This is a three-dimensional structural diagram of the first module of the precast box girder bottom mold of the present invention; Figure 4 This is a front view of the first module of the precast box girder bottom formwork of the present invention; Figure 5 This is a three-dimensional structural diagram of the second module of the precast box girder bottom mold of the present invention; Figure 6 This is the main view of the second module of the precast box girder bottom formwork of the present invention; Figure 7 This is a sectional view of the first module of the precast box girder bottom formwork of the present invention; Figure 8 This is a flowchart of the precast box girder bottom formwork assembly method of the present invention; Wherein: 100-first module, 110-first snap-fit ​​groove, 120-insertion post, 130-locking groove, 200-second module, 210-second snap-fit ​​groove, 220-insertion hole, 230-locking piece, 300-snap-fit ​​groove, 400-snap-fit ​​block, 410-handle, 420-arc-shaped groove. Detailed Implementation

[0017] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments given herein are for illustration and explanation only and are not intended to limit the present invention.

[0018] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may have other embodiments and variations thereof. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0019] like Figure 1-2As shown, a precast box girder bottom formwork includes an end module (not shown), a first module 100, a second module 200, and a snap-fit ​​block 400. The first module 100 and the second module 200 have identical X-shaped cross-sections along the X-axis. The first module 100 has a first snap-fit ​​groove 110 on each side of its X-shaped step surface along its Y-axis. Several insertion posts 120 are provided on the side steps of the first module 100, avoiding the first snap-fit ​​grooves 110. The second module 200 has a second snap-fit ​​groove 210 on each side of its X-shaped step surface along its Y-axis. The second module 200 has several insertion holes 220 on its stepped surfaces on both sides, corresponding to the positions of the insertion holes 220. The first module 100 and the second module 200 are arranged opposite each other in a U-shape and staggered. The first stepped surface of the first module 100 abuts against the second stepped surface of the second module 200. The insertion post 120 corresponding to the insertion position is inserted into the insertion hole 220. At the same time, the first snap-fit ​​groove 110 and the second snap-fit ​​groove 210 together form the snap-fit ​​groove 300. The snap-fit ​​block 400 is snapped into the snap-fit ​​groove 300 to connect the first module 100 and the second module 200.

[0020] like Figure 1-2 As shown, the first snap-fit ​​groove 110 and the second snap-fit ​​groove 210 are both inverted T-shaped grooves, which together form the I-shaped snap-fit ​​groove 300. The snap-fit ​​block 400 is an I-beam corresponding in size to the I-shaped snap-fit ​​groove 300.

[0021] like Figure 1 As shown, the operating side of the snap-fit ​​block 400 is provided with a handle 410, which facilitates the installation and removal of the snap-fit ​​block 400 by construction personnel.

[0022] like Figure 5-6 As shown, the second snap-fit ​​groove 210 has a through hole on its side wall corresponding to the insertion hole 220. A locking piece 230 is provided in the through hole. The front end of the locking piece 230 extends out of the through hole in an arc shape, and the rear end avoids the insertion hole 220 and is connected to the body of the second module 200.

[0023] like Figure 1 As shown, the snap-fit ​​block 400 and the locking piece 230 are provided with matching arc-shaped grooves 420. After the snap-fit ​​block 400 is snapped into the snap-fit ​​groove 300, the front end of the locking piece 230 is snapped into the arc-shaped groove 420.

[0024] like Figure 2 and Figure 7As shown, the plug post 120 is inserted into the plug hole 220. The plug post 120 is provided with a locking groove 130. The openings of the locking groove 130 all face the second snap-fit ​​groove 210. The openings of the locking groove 130 correspond to the locking piece 230. The locking piece 230 will snap into the snap-fit ​​groove 300 and lock the snap-fit ​​block 400.

[0025] In actual construction, the end module is half of the second module 200, and is set at both ends of the bottom formwork and connected to the corresponding first module 100. This connection ensures that the bottom formwork of the box girder is installed firmly and the joints are tight, preventing grout leakage during the concrete pouring of the box girder.

[0026] In a first preferred embodiment of the present invention, the locking piece 230 is fixedly connected to the body of the second module 200 by two cylindrical connecting posts, bypassing the insertion hole 220.

[0027] In a first preferred embodiment of the present invention, the locking piece 230 is retractably connected to the body of the second module 200 via an elastic element, avoiding the insertion hole 220. The front end of the locking piece 230 is pressed by the snap-fit ​​block 400, and its rear end is snapped into the locking groove 130 of the corresponding insertion post 120. The front end of the locking piece 230 is not pressed by the snap-fit ​​block 400, and its rear end leaves the locking groove 130 of the insertion post 120 due to the reset action of the elastic element.

[0028] In actual construction, the elastic element is a spring.

[0029] The assembly method for the bottom formwork of precast box girders includes the following steps: S100, Site preparation: Clean and level the assembly site and mark the installation positions of each module according to the design requirements. Mark the positions in the order of end module, first module 100 and second module 200, and finally end with the end module. S200, Installation of the first module 100: Hoist all the first modules 100 to their marked positions, leaving space for the second module 200, and clean the assembly surfaces of the first modules 100 to ensure that there are no foreign objects on them that may affect the assembly accuracy. S300, Cooling treatment of the components to be installed: Cool the second module 200, the end module and the snap-fit ​​block 400, and reduce the target temperature by 30-35°C compared with the original temperature; S400, Second Module 200 Installation: The second module 200 is hoisted one by one between the two corresponding first modules 100. At this time, the insertion hole 220 of the second module 200 expands after cooling, making it easier to insert into the insertion hole 220. S500, End module installation: The end module is hoisted to the first and last ends of the first module 100, using the same principle as the second module 200. The insertion hole 220 of the end module expands after cooling, making it easier to insert into the insertion hole 220. S600, Installation of the snap-fit ​​block 400: The snap-fit ​​block 400 is snapped into the snap-fit ​​groove 300, the front end of the locking piece 230 is snapped into the arc-shaped groove 420 of the snap-fit ​​block 400, and the locking piece 230 is locked into the locking groove 130 of the plug post 120. The installation is completed after standing for 24 hours.

[0030] In actual construction, concrete pouring is not recommended when the ambient temperature is below 0℃, so assembly is not considered. When the ambient temperature is above 0℃, ice-water mixture is used to cool the second module 200, the end module and the snap-fit ​​block 400. The parts to be installed after cooling are below 0℃, which does not affect concrete pouring, because after assembly, they need to be left to stand for 24 hours to allow them to recover to the ambient temperature.

[0031] In actual construction, to ensure the joints between modules are properly aligned, the assembly gaps between the insertion hole 220 and the insertion post 120, and between the snap-fit ​​block 400 and the snap-fit ​​groove 300, are designed to be small. Due to their heavy weight, manual assembly is not feasible during installation, and mechanical hoisting is too difficult. Therefore, by cooling the second module 200 and the end module, the insertion hole 220 is enlarged, increasing the gap between the insertion hole 220 and the insertion post 120 during assembly and decreasing it after assembly. Similarly, by cooling the snap-fit ​​block 400, the gap between the snap-fit ​​block 400 and the snap-fit ​​groove 300 is reduced, increasing the gap between the snap-fit ​​block 400 and the snap-fit ​​groove 300 during assembly and decreasing it after assembly. This reduces the difficulty and time of assembly while ensuring the assembly gaps are within acceptable limits.

[0032] Since the second module 200 is provided with a plug hole 220, it is difficult to clean the debris in the plug hole 220 if the second module 200 is installed first. Therefore, the construction sequence of installing the first module 100 first and then the second module 200 is usually adopted.

[0033] Construction workers connect the second module 200 and the first module 100 by inserting the plug-in hole 220 into the plug-in post 120. Then, they insert the locking block 400 into the locking groove 300 formed after the second module 200 and the first module 100 are connected. After pushing the locking block 400 into the locking groove 300, the front end of the locking piece 230 is locked into the arc-shaped groove 420, and the rear end of the locking piece 230 is locked into the corresponding locking groove 130 of the plug-in post 120, thereby locking the plug-in post 120. In this way, by inserting the locking block 400, the plug-in post 120 can be locked while connecting the second module 200 and the first module 100, which not only improves the firmness of the connection but also reduces the disassembly and assembly steps. The bottom formwork of the box girder can be disassembled simply by inserting and removing the locking block 400, which improves the disassembly efficiency.

[0034] The plug-in post 120 on the first module 100 is integrated with the first module 100 and does not need to be disassembled. Furthermore, the template surface after the second module 200 and the first module 100 are connected has no protrusions and has high flatness.

[0035] It should be understood that the above embodiments are one or more embodiments of the present invention, and there are many other embodiments and variations based on the present invention; any variations and modifications made by those skilled in the art through the present invention without making pioneering innovations are all within the protection scope of the present invention.

Claims

1. A precast box girder bed form, characterised in that: The application relates to a module assembly structure, which comprises an end module, a first module, a second module and a clamping block, wherein the first module and the second module are both in the shape of a convex letter along the X-axis direction and have the same size, a first clamping groove is formed on the step surface of the two sides of the first module along the Y-axis direction, a plurality of inserting columns are arranged on the step surface of the two sides of the first module and away from the first clamping groove, a second clamping groove is formed on the step surface of the two sides of the second module along the Y-axis direction, a plurality of inserting holes are arranged on the step surface of the two sides of the second module and correspond to the inserting columns, the first module and the second module are arranged oppositely and staggered in the shape of a convex letter, the step surface of the head of the first module is in abutment with the step surface of the tail of the second module, the inserting columns are inserted into the inserting holes, and the first clamping groove and the second clamping groove are combined to form the clamping groove, and the clamping block is clamped into the clamping groove to connect the first module and the second module.

2. The precast box girder bed form of claim 1, wherein: The first clamping groove and the second clamping groove are both inverted T-shaped grooves, the clamping groove formed by the combination of the first clamping groove and the second clamping groove is in the shape of an I-beam, and the clamping block is an I-beam with the same size as the clamping groove.

3. The precast box beam bottom form of claim 1, wherein: A through hole is arranged on the side wall of the second clamping groove and corresponds to the inserting hole, a locking piece is arranged in the through hole, the front end of the locking piece is in the shape of a circular arc before the locking piece extends out of the through hole, and the rear end of the locking piece is connected to the body of the second module and away from the inserting hole.

4. The precast box beam bed form of claim 3, wherein: An arc-shaped recess corresponding to the locking piece is arranged on the clamping block and corresponds to the locking piece, and the front end of the locking piece is clamped into the arc-shaped recess after the clamping block is clamped into the clamping groove.

5. The precast box beam bed form of claim 3, wherein: The inserting columns are inserted into the inserting holes, locking grooves are arranged on the inserting columns, the opening directions of the locking grooves are all towards the second clamping groove, the locking grooves correspond to the locking pieces, and the locking pieces lock the clamping block clamped into the clamping groove.

6. The precast box beam bed form of claim 5, wherein: The locking piece is fixedly connected to the body of the second module through two cylindrical connecting columns and away from the inserting hole.

7. The precast box beam bottom form of claim 5, wherein: The locking piece is telescopically connected to the body of the second module through an elastic member and away from the inserting hole, the front end of the locking piece is extruded by the clamping block, the rear end of the locking piece is clamped into the locking groove of the corresponding inserting column, the front end of the locking piece is not extruded by the clamping block, and the rear end of the locking piece is away from the locking groove of the inserting column due to the resetting action of the elastic member.

8. The precast box beam bed form of claim 7, wherein: The elastic member is a spring.

9. The precast box beam bed form of claim 1, wherein: The end module is half of the second module or the first module and is arranged at the two ends of the bottom module and connected with the corresponding first module or second module.

10. The method of assembling a precast box girder bed form according to any one of claims 1 to 9, wherein, The application further discloses a module assembly method, which comprises the following steps: S100, site preparation: cleaning, leveling and marking the installation positions of the modules according to the design requirements; S200, first module installation: hoisting all the first modules to the marked positions and cleaning the assembly surfaces; S300, temperature reduction treatment of the to-be-installed parts: reducing the temperature of the second module, the end module and the clamping block by 30-35 DEG C compared with the original temperature; S400, second module installation: hoisting the second modules one by one into the space between the corresponding two first modules and installing through the inserting holes and the inserting columns; S500, end module installation: hoist the end module to the first module head and tail, and install through the plug-in hole and plug-in column; S600, card block installation: the card block is clamped into the card slot, the front end of the locking piece is clamped into the arc-shaped groove of the card block, and the locking piece is locked into the locking groove of the plug-in column, and the installation is completed.

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