Box girder internal mold for multi-section synchronous mold folding and closing and box girder template

Abstract

A box girder inner mold for multi-section synchronous mold folding and closing comprises two side mold assemblies, each side mold assembly comprises an end section, a variable section and a middle section which are sequentially arranged, each end section, each variable section and each middle section comprise a first movable mold and a second movable mold, a first receding structure is arranged between the end portions of panels of every two adjacent second movable molds of each variable section and each middle section, and a second receding structure is arranged between the end portions of panels of every two adjacent second movable molds of each variable section and each middle section. The second movable molds of the variable section and the middle section do not interfere with each other during rotation; first plugging pieces for plugging the first clearance structures are arranged on the non-working surface sides of the end parts of the panels of the two adjacent second movable molds of the variable section and the middle section; and an avoiding structure is arranged between the two adjacent second movable molds of the variable section and the end section, so that the second movable molds of the variable section and the end section do not interfere with each other during rotation. According to the box girder inner mold, overall mold closing or mold closing of the variable sections, the middle sections and the end sections can be achieved under the condition that all the sections are not detached, slurry leakage from a receding structure is avoided, and the overall structure is simple. The utility model further provides the box girder formwork.

Description

Technical Field

[0001] The utility model relates to the technical field of box girder formwork, in particular to an internal formwork for box girder and a box girder formwork with multi-segment synchronous closing and opening molds. Background Technique

[0002] The inside of the box girder is a hollow cavity. When prefabricating the box girder, an internal formwork needs to be embedded inside. After the concrete is poured, the formwork is demolded. The end outlet of the beam body is smaller than the cross-section of the inner cavity in the middle of the beam, and there is a variable section between the middle of the beam and the beam end. The movable molds of the internal formwork of the box girder generally adopt a hinged structure to achieve rotational connection. When closing the formwork, since the rotation axis of the variable section is not parallel to the rotation axis of the middle section in the middle of the beam and the rotation axis of the end section at the beam end, interference may occur between the variable section and the middle section in the middle of the beam and the end section at the beam end during the movement of the variable section.

[0003] In the prior art, the internal formwork of the small box girder is generally divided into a mechanical internal formwork and a hydraulic internal formwork according to different demolding methods: for the mechanical internal formwork of the small box girder, the connecting bolts, positioning pins, etc. between the formworks are usually disassembled, and each section of the formwork is demolded separately and then each formwork is pulled out of the concrete inner cavity by a winch respectively. When prefabricating the next beam body of the internal formwork, it is necessary to reinstall all of them, set up the formwork and then connect them, and the disassembly and assembly workload is huge; the demolding of the hydraulic box girder internal formwork generally demolds the internal formwork in three sections, similar to an internal formwork for a full-hole precast box girder disclosed in Chinese Patent CN202120489516.2. The internal formwork is closed and opened in batches out of sync according to the end section, variable section and middle section, so that the formworks wrap each other to avoid interference. The shrinkage action of this formwork is complex, and the connection and limit between the sections also need to be completely removed before shrinkage.

[0004] Therefore, the existing demolding methods of the internal formwork of the small box girder have the following problems: the installation and disassembly workload is large, or the action process is complex, and it is difficult to meet the requirements of safe and efficient demolding. Content of the Utility Model

[0005] In view of this, the utility model provides an internal formwork for box girder and a box girder formwork with multi-segment synchronous closing and opening molds, which can overcome the problem of movement interference between the variable section and the adjacent middle section and end section caused by the non-parallel rotation axes between them. It can realize the overall closing or opening of the variable section, middle section and end section of the internal formwork of the box girder without disassembling each section, thereby simplifying the construction process, reducing the construction difficulty, improving the construction efficiency, and since a sealing member is provided at the bottom of the void structure to seal the bottom of the void structure, it further avoids leakage of slurry from the bottom of the void structure during the pouring of the box girder, and the overall structure is simple.

[0006] To achieve the above object:

[0007] On the one hand, the present application provides a multi-segment synchronous folding die inner formwork for a box girder. The box girder inner formwork includes two side formwork assemblies, which are arranged opposite to each other in the first direction. The side formwork assembly includes an end segment, a variable segment, and a middle segment arranged in sequence in the second direction perpendicular to the first direction. The end segment, the variable segment, and the middle segment all include a first moving die and a second moving die arranged circumferentially along the box girder inner formwork, and the second moving die is rotatably connected to the first moving die; a first clearance structure is provided between the panel ends of two adjacent second moving dies of the variable segment and the middle segment, so that there is no interference between the second moving dies of the variable segment and the middle segment when they rotate; a first sealing member is provided on the non-working surface side of the panel ends of two adjacent second moving dies of the variable segment and the middle segment, and the first sealing member is used to seal the inner side of the first clearance structure; a clearance structure is provided between two adjacent second moving dies of the variable segment and the end segment, so that there is no interference between the second moving dies of the variable segment and the end segment when they rotate.

[0008] In one embodiment, the clearance structure is a second clearance structure provided between the panel ends of two adjacent second moving dies of the variable segment and the end segment, and a second sealing member is provided between the non-working surface sides of the panel ends of two adjacent second moving dies of the variable segment and the end segment, and the second sealing member is used to seal the second clearance structure.

[0009] In one embodiment, the first moving die of the end segment is provided with a first hinge plate, and the second moving die of the end segment is provided with a second hinge plate. The first hinge plate and the second hinge plate are arranged opposite to each other in the second direction, and the first hinge plate and the second hinge plate are hinged to each other through a hinge member; the clearance structure is an adjustment gap provided in the second direction between the first hinge plate and the second hinge plate.

[0010] In one embodiment, the first clearance structure is a reserved gap, which is provided between the opposite sides of the panel of the variable segment and the panel of the middle segment in the second direction, and the first sealing member is provided on the inner sides of the panel of the variable segment and the panel of the middle segment.

[0011] In one embodiment, the first sealing member is a patch plate, and the side of the panel of the middle segment close to the reserved gap is provided with a lapping portion; one side of the patch plate is fixedly lapped on the inner surface of the side of the panel of the variable segment close to the reserved gap, and the other side of the patch plate extends along the second direction through the bottom of the reserved gap to the inner surface of the lapping portion and is movably lapped with it.

[0012] In one embodiment, the reserved gap is provided between two relatively parallel plane sections or between two concentric and spaced arc sections.

[0013] In one embodiment, connecting plates are fixedly provided on both the patch plate and the side of the middle segment close to the lapping portion, and positioning members are arranged along the second direction on the connecting plates to limit the relative movement of the variable segment and the middle segment in the first direction and realize the relative movement of the variable segment and the middle segment in the second direction.

[0014] In one embodiment, the positioning member is a pin structure that cooperates with the clearance of the connecting plate so that the variable segment and the middle segment can move relative to each other along the second direction, and limit members are detachably provided at both ends of the pin structure; or, a limit structure is provided at one end of the pin structure, and a limit member is detachably provided at the other end; the limit structure and the limit member are used to prevent the positioning member from falling.

[0015] In one embodiment, a connecting plate is fixedly provided on one side of the variable segment and the end segment close to each other, and a positioning piece is passed through the connecting plate along the second direction to limit the relative movement of the variable segment and the end segment along the first direction and to enable the relative movement of the variable segment and the end segment along the second direction.

[0016] Based on the same concept as the aforementioned utility model, the present application also provides a box girder formwork, which can be provided with a box girder inner mold as the aforementioned multi-segment synchronous closing mold.

[0017] The box girder inner mold and box girder formwork with multiple segments of synchronous closing and retracting molds provided by the present application have a gap avoidance structure between the panel ends of the two second movable molds adjacent to the variable segment and the middle segment to avoid interference between the two second movable molds adjacent to the variable segment and the middle segment when the second movable molds in the variable segment and the middle segment rotate. In addition, a gap avoidance structure is provided between the side portions of the two second movable molds adjacent to the variable segment and the end segment to avoid interference between the two second movable molds adjacent to the variable segment and the end segment when the second movable molds of the variable segment and the end segment rotate. Therefore, the problem of mutual motion interference caused by the non-parallel rotation axes between the variable segment and the adjacent middle segment and end segment can be overcome, and the box girder inner mold can realize the overall closing or closing of the variable segment, the middle segment and the end segment without disassembling the segments, thereby simplifying the construction process, reducing the construction difficulty, and improving the construction efficiency. Moreover, since a blocking member is provided on the inner side of the first gap avoidance structure to block the inner side of the gap avoidance structure, leakage of slurry from the inner side of the gap avoidance structure during the casting of the box girder can be avoided, and the overall structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 The main structure of the inner mold of the box beam of the multi-segment synchronous collapsible mold of the embodiment of the present application is schematically shown;

[0020] Figure 2 The side view structure of the inner mold of the box beam of the multi-segment synchronous collapsible mold according to the embodiment of the present application is schematically shown;

[0021] Figure 3 Schematically shows a partially enlarged three-dimensional structure of the box girder internal formwork of the multi-segment synchronous folding mold according to an embodiment of the present application;

[0022] Figure 4 and Figure 5 Schematically shows a partially enlarged planar structure of the box girder internal formwork of the multi-segment synchronous folding mold according to an embodiment of the present application, respectively. Specific embodiments

[0023] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the description of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0024] In the description of the present invention, unless otherwise clearly defined and limited, terms such as "arranged", "provided with", "disposed on", "installed", "connected", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms may be understood according to specific circumstances.

[0025] The orientation or positional relationship indicated by terms such as "front end", "upper", "side", "bottom", "inner side", "outer side", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use. It is only for the convenience of description and simplification of the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0026] In the description of the present invention, unless otherwise clearly defined and limited, terms such as "first", "second", etc. are only used to distinguish elements with similar attributes, rather than indicating or implying relative importance or a specific order.

[0027] The term "comprising" or any other variant thereof is intended to cover non-exclusive inclusion. In addition to including those listed elements, it may also include other elements not specifically listed.

[0028] Such as Figures 1 to 3As shown in the figure, the box girder internal formwork of the multi-section synchronous folding and closing die according to the embodiment of the present application includes two side formwork assemblies 100. The two side formwork assemblies 100 are arranged opposite to each other in the first direction. The side formwork assembly 100 includes an end section 10, a variable section 20, and a middle section 30 arranged in sequence in the second direction perpendicular to the first direction. The end section 10, the variable section 20, and the middle section 30 all include a first moving die 101 and a second moving die 102 arranged circumferentially along the box girder internal formwork. The second moving die 102 is rotatably connected to the first moving die 101. The rotation axis 1021 of the second moving die 102 of the variable section 20 is not parallel to the rotation axes 1021 of the second moving dies 102 of the end section 10 and the middle section 30. A first clearance structure 40 is provided between the panel ends of the adjacent second moving dies 102 of the variable section 20 and the middle section 30, so that the second moving dies 102 of the variable section 20 and the middle section 30 do not interfere with each other when rotating. A first sealing member 50 is provided on the non-working surface side of the panel ends of the adjacent second moving dies 102 of the variable section 20 and the middle section 30. The first sealing member 50 is used to seal the first clearance structure 40. A clearance structure is provided between the adjacent second moving dies 102 of the variable section 20 and the end section 10, so that the second moving dies 102 of the variable section 20 and the end section 10 do not interfere with each other when rotating. Specifically, in this embodiment, the first direction is the transverse direction of the box girder internal formwork, and the second direction is the longitudinal direction of the box girder internal formwork. The connection structure between the two side formwork assemblies 100, the telescopic driving structure, and the rotational connection structure and telescopic driving structure between the first moving die 101 and the second moving die 102 can all be implemented by existing technologies and will not be elaborated in detail here.

[0029] For the box girder internal formwork of the multi-section synchronous folding and closing die according to the embodiment of the present application, by providing a first clearance structure 40 between the panel ends of the adjacent second moving dies 102 of the variable section 20 and the middle section 30, it is possible to prevent interference between the adjacent second moving dies 102 of the variable section 20 and the middle section 30 when the second moving dies 102 in the variable section 20 and the middle section 30 rotate. In addition, a clearance structure is provided between the non-working surface sides of the panel ends of the adjacent second moving dies 102 of the variable section 20 and the end section 10, so as to prevent interference between the adjacent second moving dies 102 of the variable section 20 and the end section 10 at the joint of the two second moving dies 102 when the second moving dies of the variable section 20 and the end section 10 rotate. Therefore, the problem of movement interference caused by the non-parallel rotation axes between the variable section 20 and the adjacent middle section 30 and end section 10 can be overcome, and the box girder internal formwork can be integrally folded or closed for the variable section 20, the middle section 30, and the end section 10 without disassembling each section, thereby simplifying the construction process, reducing the construction difficulty, and improving the construction efficiency. Moreover, since a first sealing member 50 is provided inside the first clearance structure 40 to seal the inside of the first clearance structure 40, it is possible to ensure that the mold is closed in place and prevent leakage of slurry from the first clearance structure 40 during the box girder pouring process, and the overall structure is simple.

[0030] In an embodiment (not shown), the avoidance structure is a second clearance structure provided between the end faces of the panels of two adjacent second moving dies 102 of the variable section 20 and the end section 30. A second blocking member is provided between the non-working faces of the end faces of the two adjacent second moving dies 102 of the variable section 20 and the end section 30, and the second blocking member is used to block the second clearance structure. It is easy to understand that the second clearance structure can also adopt a structure similar to that of the first clearance structure 40.

[0031] As Figure 1 shown, in one embodiment, the first moving die 101 of the end section 10 is provided with a first hinge plate 1011, and the second moving die 102 of the end section 10 is provided with a second hinge plate 1022. The first hinge plate 1011 and the second hinge plate 1022 are arranged opposite to each other in the second direction. The first hinge plate 1011 and the second hinge plate 1022 are hinged to each other through a hinge member 1013. The avoidance structure is an adjustment gap provided between the first hinge plate 1011 and the second hinge plate 1022 in the second direction, that is, the longitudinal direction of the inner form of the box girder. Obviously, for the avoidance structure of the above structural form, the structural characteristics of the side form assembly 100 itself are fully utilized, and the adjustment gap is reasonably set to form an avoidance space. On the premise of effectively avoiding interference during the synchronous mold closing of the end section 10 and the variable section 20, the structure is simplified as much as possible, and the processing and manufacturing costs are saved.

[0032] As Figures 2 to 5 shown, in one embodiment, the first clearance structure 40 is a reserved gap c. The reserved gap c is provided between the opposite sides of the panel 201 of the variable section 20 and the panel 301 of the middle section 30 in the second direction. The first blocking member 50 is provided on the inner sides of the panel 201 of the variable section 20 and the panel 301 of the middle section 30. By setting the reserved gap c as the first clearance structure 40, the anti-interference effect is ensured to a great extent. At the same time, the structure of the first clearance structure 40 is simple, easy to process and manufacture, and is beneficial to cost saving.

[0033] Please refer to Figure 4 and Figure 5 , in one embodiment, the first blocking member 50 is a patch plate, and the side of the panel 301 of the middle section 30 close to the reserved gap c is provided with a lapping portion 302; one side of the patch plate is fixedly lapped on the inner surface of the side of the panel 201 of the variable section 20 close to the reserved gap c, and the other side of the patch plate extends along the second direction through the bottom of the reserved gap c to the inner surface of the lapping portion 302 and is movably lapped therewith, thus forming a mother-child type lapping structure. Specifically, in one embodiment, the vertical distance a in the longitudinal direction of the inner form of the box girder between the side of the panel 201 of the variable section 20 forming the reserved gap c and the outer side of the patch plate is greater than the longitudinal width of the reserved gap c, and the value of the longitudinal width b of the lapping portion 302 ensures that there is an overlapping part between the patch plate and the bottom of the lapping portion 302.

[0034] Specifically, please refer to Figure 5 , the patch plate is fixedly connected to the inner surface of the panel 201 of the variable segment 20, and a reserved gap c is formed between the opposite sides along the longitudinal direction of the box girder inner formwork between the panel 301 of the middle segment 30 and the panel 201 of the variable segment 20. The overlapping portion 302 of the panel 301 of the middle segment 30 is in upper and lower fit with the extended portion of the patch plate, ensuring the continuity and integrity of the box girder during construction, enhancing the structural stability, thus enhancing the stability of the entire box girder formwork structure, ensuring that it will not deform due to external forces or internal stresses during construction, accurately controlling the relative position between the patch plate and the panel 201 of the variable segment 20, thereby ensuring the construction accuracy and ensuring that the size and shape of the box girder meet the design requirements. Through the above-mentioned matching structure of the patch plate, the panel 201 of the variable segment 20 and the overlapping portion 302 of the middle segment 30, cracks caused by temperature changes, concrete shrinkage or other external factors can be avoided, the construction process is simplified, the connection between the variable segment 20 and the adjacent middle segment 30 and end segment 10 is made more convenient, the construction speed is accelerated, the load is evenly distributed, the stability and bearing capacity of the box girder structure are improved, the inspection and maintenance during construction are made more convenient, problems during construction can be discovered and solved in time, the construction efficiency can be improved, and the construction time and cost can be reduced. The reserved gap c allows fine adjustment of the box girder inner formwork during construction to adapt to possible construction interferences, construction errors or material shrinkage and other changes, thereby ensuring the final size and shape of the box girder structure.

[0035] In an embodiment, the reserved gap c is provided between two relatively parallel plane sections or between two arc sections with the same center and a certain interval. The width of the reserved gap c is 0 - 200 mm.

[0036] Specifically, please refer to Figure 5 , the reserved gap c is provided between the plane sections parallel to each other on the opposite sides along the longitudinal direction of the box girder inner formwork between the panel 201 of the variable segment 20 and the panel 301 of the middle segment 30. The longitudinal width of the reserved gap c along the box girder inner formwork is preferably 10 - 200 mm. Optionally, the reserved gap c is preferably 30 mm - 150 mm, and the reserved gap c can also be preferably 50 mm - 100 mm. Specifically, the reserved gap c is set according to the design dimensions of the box girder formwork. After determining the formwork segmentation and formwork removal angle based on the formwork removal state, the interference value is calculated. The reserved gap c usually takes the interference value + 1 - 10 mm. Preferably, the reserved gap c takes the interference value + 5 mm. If the reserved gap c is too small, for example, less than 10 mm, there may still be interference; if the reserved gap c is too large, greater than 200 mm, a large area of glue needs to be applied, or a large concrete step will be generated after pouring, thereby increasing the construction process and the cost of beam manufacturing.

[0037] In an embodiment (not shown), a reserved gap c is provided between two concentric and spaced arc-shaped sections constructed at the positions where the panel 201 of the variable section 20 and the panel 301 of the middle section 30 interfere with each other along the longitudinal relative sides of the inner form of the box girder in the rotation trajectories of the second moving molds 102 of the variable section 20 and the second moving molds 102 of the middle section 30. The width of the reserved gap c is preferably not less than 0 mm. At this time, the backing plate at the bottom of the reserved gap c can be cancelled, so that the structure can be simplified as much as possible on the premise of ensuring the anti-interference effect to a great extent.

[0038] In an embodiment, the reserved gap c is filled with a foam rubber layer. Obviously, by filling the reserved gap c with a foam rubber layer, the integrity of the casting of the box girder body can be ensured, unnecessary stepped structures can be avoided, and the process of closing and opening the inner form of the box girder will not be affected.

[0039] As Figure 3 shown, in an embodiment, a connecting plate 60 is fixedly connected to one side of the backing plate along the longitudinal direction of the box girder formwork close to the overlapping part 302. A positioning member 70 is arranged on the connecting plate 60 along the first direction to limit the relative movement of the variable section 20 and the middle section 30 along the first direction and to realize the relative movement of the variable section 20 and the middle section 30 along the second direction. The positioning members 70 are arranged on the connecting plate 60 at equal intervals. It is easy to understand that, in an embodiment, a connecting plate 60 is also provided at the end of the middle section 30 along the longitudinal direction of the box girder formwork corresponding to the end of the variable section 20, and the adjacent two connecting plates 60 are connected by the positioning member 70. In an embodiment, the positioning member 70 is a pin shaft structure with a clearance fit with the connecting plate 60, so that the variable section 20 and the middle section 30 can move relatively along the second direction, and the two ends of the pin shaft structure are detachably provided with limiting members 80; alternatively, a limiting structure is arranged at one end of the pin shaft structure, and a limiting member 80 is detachably arranged at the other end; the limiting structure and the limiting member 80 are used to limit the positioning member 70 from falling off the connecting plate 60. Specifically, in this embodiment, the limiting structure can be a limiting step, and the limiting member is a locking nut screwed to the end of the pin shaft structure. It is easy to understand that, in an embodiment (not shown), a connecting plate 60 is also provided at the end of the end section 10 along the longitudinal direction of the box girder formwork corresponding to the end of the variable section 20, and the adjacent two connecting plates 60 are connected by the positioning member 70.

[0040] It is easy to understand that, in an embodiment (not shown), connecting plates 60 are fixedly provided on both sides of the variable section 20 and the end section 10 close to each other, and a positioning member 70 is arranged on the connecting plate 60 along the second direction to limit the relative movement of the variable section 20 and the end section 10 along the first direction and to realize the relative movement of the variable section 20 and the end section 10 along the second direction.

[0041] As Figure 3As shown, in one embodiment, an end of the connecting plate 60 corresponding to the ends of the second moving dies 102 of the two side die assemblies 100 close to each other is provided with an inclined notch structure 601, so that there is no interference between the second moving dies 102 of the two side die assemblies 100 when they rotate. Obviously, by providing the inclined notch structure 601 at the end of the connecting plate 60, it is possible to further avoid the movement interference between the second moving dies 102 of the two side die assemblies 100 during the mold closing process of the box girder internal mold.

[0042] As Figures 3 to 5 shown, in one embodiment, plug weld holes 501 are provided at intervals on the upper surface of the patch plate. The plug weld holes 501 are used for positioning the patch plate welded to the panel 201 of the variable section 20. Specifically, the plug weld holes 501 are used to realize the welded fixed connection between the patch plate 400 and the panel 201 of the variable section 20. The plug weld holes 501 provide precise positioning points to ensure the accurate position of the patch plate and the panel 201 of the variable section 20 during welding, and avoid misalignment during the welding process. In the ordinary welding process, a heat affected zone will be generated, which may cause material deformation. However, by welding with the plug welds 501, the heat can be transferred more concentratedly, reducing the influence on the surrounding materials, thereby reducing the risk of deformation. The plug weld holes 501 can also ensure the gap and alignment accuracy during welding, thereby improving the quality of the welded joint and reducing the occurrence of welding defects such as pores and cracks; the plug weld holes 501 can be used as a guide for welding, simplifying the welding process and making the welding operation easier to perform, especially in automated welding. In addition, by welding with the plug weld holes 501, a high-strength connection between the patch plate and the panel 201 of the variable section 20 can be achieved, enhancing the load-bearing capacity of the overall structure. The use of the plug weld holes 501 can ensure the consistency of each welding point, improve the welding quality of the entire box girder formwork, and distribute the welding stress more evenly through welding with the plug weld holes 501, reducing stress concentration and prolonging the service life of the structure.

[0043] Based on the same concept as the foregoing embodiments, the embodiment of the present application further provides a box girder formwork, which can be provided with a box girder internal mold for synchronous mold closing of multiple sections as described in the foregoing embodiments.

[0044] According to the above embodiments, it can be seen that for the multi-segment synchronous folding and closing die box girder inner mold and box girder formwork provided by the present application, a first clearance structure is provided between the sides of two second moving dies adjacent to the variable segment and the middle segment to avoid interference between the two second moving dies adjacent to the variable segment and the middle segment when the second moving dies in the variable segment and the middle segment rotate. In addition, an avoidance structure is provided between the sides of two second moving dies adjacent to the variable segment and the end segment to avoid interference between the two second moving dies adjacent to the variable segment and the end segment when the second moving dies in the variable segment and the end segment rotate. Therefore, the problem of movement interference between each other caused by the non-parallel rotation axes between the variable segment and the adjacent middle segment and end segment can be overcome, and the overall folding or closing of the variable segment, middle segment, and end segment of the box girder inner mold can be realized without disassembling each segment, thereby simplifying the construction process, reducing the construction difficulty, improving the construction efficiency, and since a sealing member is provided at the bottom of the first clearance structure to seal the first clearance structure, leakage of slurry from the first clearance structure during the box girder pouring process is avoided, and the overall structure is simple.

[0045] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily obtained by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A box girder inner mold with a multi-segment synchronous folding mold, the box girder inner mold comprising two side mold assemblies (100), the two side mold assemblies (100) are arranged opposite to each other along a first direction, the side mold assembly (100) comprises an end segment (10), a variable segment (20) and a middle segment (30) arranged in sequence along a second direction perpendicular to the first direction, the end segment (10), the variable segment (20) and the middle segment (30) all comprise a first movable mold (101) and a second movable mold (102) arranged in a circumferential direction of the box girder inner mold, the second movable mold (102) being rotatably connected to the first movable mold (101); characterized in that A first air avoidance structure (40) is provided between the panel ends of two adjacent second movable molds (102) of the variable segment (20) and the middle segment (30), so that the second movable molds (102) of the variable segment (20) and the middle segment (30) do not interfere with each other when rotating; A first blocking member (50) is provided on the non-working surface side of the panel ends of two adjacent second movable molds (102) of the variable segment (20) and the middle segment (30), and the first blocking member (50) is used to block the first air avoidance structure (40); An avoidance structure is provided between two adjacent second movable dies (102) of the variable segment (20) and the end segment (10), so that the second movable dies (102) of the variable segment (20) and the end segment (10) do not interfere with each other when they rotate.

2. The box beam inner mold of the multi-segment synchronous closing mold according to claim 1 is characterized in that: The avoidance structure is a second avoidance structure provided between the panel ends of two adjacent second movable molds (102) of the variable segment (20) and the end segment (10), A second blocking piece is provided between the non-working surface sides of the panel ends of two adjacent second movable molds (102) of the variable segment (20) and the end segment (10), and the second blocking piece is used to block the second air avoidance structure.

3. The box beam inner mold of the multi-segment synchronous collapsible mold according to claim 1 is characterized in that: The first movable mold (101) of the end segment (10) is provided with a first hinged plate (1011), and the second movable mold (102) of the end segment (10) is provided with a second hinged plate (1022). The first hinged plate (1011) and the second hinged plate (1022) are arranged opposite to each other along the second direction, and the first hinged plate (1011) and the second hinged plate (1022) are hinged to each other through a hinge (103); the avoidance structure is an adjustment gap arranged between the first hinged plate (1011) and the second hinged plate (1022) along the second direction.

4. The box beam inner mold of the multi-segment synchronous collapsible mold according to any one of claims 1 to 3, characterized in that: The first air avoidance structure (40) is a reserved gap (c), and the reserved gap (c) is provided between two sides of the panel (201) of the variable segment (20) and the panel (301) of the middle segment (30) that are opposite to each other along the second direction, and the first blocking member (50) is provided on the inner side of the panel (201) of the variable segment (20) and the panel (301) of the middle segment (30).

5. The box beam inner mold of the multi-segment synchronous collapsible mold according to claim 4 is characterized in that: The first blocking member (50) is a sticking plate, and a lap joint (302) is provided on a side of the panel (301) of the middle section (30) close to the reserved gap (c); One side of the sticking plate is fixedly overlapped with the inner surface of the panel (201) of the variable segment (20) close to the reserved gap (c), and the other side of the sticking plate extends along the second direction through the bottom of the reserved gap (c) to the inner surface of the overlapping portion (302) and is movably overlapped therewith.

6. The box beam inner mold of the multi-segment synchronous collapsible mold according to claim 4, characterized in that: The reserved gap (c) is arranged between two relatively parallel plane sections or between two concentric and alternate arc sections.

7. The box beam inner mold of the multi-segment synchronous collapsible mold according to claim 5, characterized in that: A connecting plate (60) is fixedly provided on one side of the sticking plate and the middle segment (30) close to the overlapping portion (302), and a positioning member (70) is passed through the connecting plate (60) along the second direction to limit the relative movement of the variable segment (20) and the middle segment (30) along the first direction and to enable the relative movement of the variable segment (20) and the middle segment (30) along the second direction.

8. The box beam inner mold of the multi-segment synchronous collapsible mold according to claim 7, characterized in that: The positioning member (70) is a pin structure that is clearance-matched with the connecting plate (60), so that the variable segment (20) and the middle segment (30) can move relative to each other along the second direction, and both ends of the pin structure are detachably provided with stoppers (80); or, A limiting structure is provided at one end of the pin structure, and a limiting member (80) is detachably provided at the other end; The limiting structure and the limiting member (80) are used to limit the positioning member (70) from falling.

9. The box beam inner mold of the multi-segment synchronous collapsible mold according to any one of claims 1 to 3, characterized in that: A connecting plate (60) is fixedly provided on one side of the variable segment (20) and the end segment (10) which are close to each other, and a positioning member (70) is passed through the connecting plate (60) along the second direction to limit the relative movement of the variable segment (20) and the end segment (10) along the first direction and to enable the relative movement of the variable segment (20) and the end segment (10) along the second direction.

10. A box beam formwork, characterized in that: The box beam template is provided with an inner mold of a multi-segment synchronous folding mold as described in any one of claims 1 to 9.

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