An inner form assembly for a box girder and a method of construction thereof

Abstract

The present application relates to the field of bridge engineering, and particularly relates to an inner mold assembly of a box girder and a construction method thereof. The inner mold assembly comprises a base, two side molds, a first sliding plate and a second sliding plate. The base is provided with traveling wheels, which can extend downward out of the bottom surface of the base and retract upward. The two side molds are respectively located on the two sides of the base, and the two side molds can approach and move away from each other. The first sliding plate and the second sliding plate are respectively in sliding connection with the two side molds, and the first sliding plate and the second sliding plate can move up and down relative to the corresponding side molds. The base, the side molds, the first sliding plate and the second sliding plate are used to enclose a mold for forming an internal cavity of a formed box girder. The inner mold assembly of the present application does not need to turn down the single-side top plate, so the single-side top plate can be designed as an integral structure, which enhances the integrity of the formwork, reduces the misalignment phenomenon, and improves the forming quality of the box girder.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering, and in particular to an inner formwork assembly for a box girder and its construction method. Background Technology

[0002] Concrete box girders in bridge engineering are beam structures with a box-shaped cross-section, primarily made of concrete. They possess advantages such as good integrity, high torsional stiffness, and reasonable stress distribution, making them adaptable to various complex bridge types. Widely used in highway and railway bridge construction, they effectively bear loads from vehicles and pedestrians and safely transfer them to the bridge pier foundations. During the pouring and construction of concrete box girders in the prefabrication yard, inner and outer molds are typically used in conjunction to achieve the overall shaping of the concrete box girder.

[0003] Currently, the inner formwork used for concrete box girders is generally made of steel. To facilitate demolding, the conventional method is to divide the top plate of the inner formwork into two areas along the central axis, and then fold these two areas downwards to achieve demolding. However, when the inner cavity of the concrete box girder has a variable cross-section along the box girder axis, especially when the top surface of the inner cavity is stepped, if the existing method of rotating and folding the top plate of the inner formwork downwards is still used, the top surface of each side needs to be divided into several pieces along the box girder axis, and each piece needs to be rotated and folded independently. However, this excessive number of independent sections significantly weakens the integrity of the formwork, and deformation easily occurs between adjacent folded plates, which can lead to misalignment after concrete pouring, ultimately affecting the forming quality of the box girder. Summary of the Invention

[0004] The purpose of this invention is to overcome the problem in the prior art where, when the inner mold of a box girder is applied to the inner cavity of the box girder and presents a variable cross-section along the axial direction of the box girder, the top surface of each side needs to be divided into several pieces along the axial direction of the box girder, and each piece needs to be independently rotated and folded. However, this excessive independent segmentation design significantly weakens the integrity of the mold, and deformation easily occurs between adjacent folded plates, which can easily lead to misalignment after concrete pouring, ultimately affecting the forming quality of the box girder. Therefore, this invention provides an inner mold assembly for a box girder and its construction method.

[0005] In a first aspect, the present invention provides an inner mold assembly for a box girder, comprising:

[0006] A base, on which are provided wheels, which can extend downwards from the bottom surface of the base and retract upwards; Two side molds are located on both sides of the base, and the two side molds can move closer to each other and further away from each other; A first sliding plate and a second sliding plate are slidably connected to the two side molds respectively, and both the first sliding plate and the second sliding plate can move up and down relative to the corresponding side molds. The base, the side mold, the first sliding plate, and the second sliding plate are used to enclose the mold that forms the internal cavity of the molded box girder.

[0007] The base is used to form the bottom surface of the box girder cavity; the first sliding plate and the second sliding plate are used to form the top surface and the upper area of ​​the two sides of the box girder cavity; the two side molds are used to form the lower area of ​​the two sides of the box girder cavity.

[0008] This invention provides an inner mold assembly for a box girder. The base supports the side molds on both sides, and the bottom surface of the base is used to form the bottom surface of the box girder's inner cavity. The traveling wheels have a vertical lifting function. During the formwork support stage, the traveling wheels can retract upwards to prevent them from protruding from the bottom surface of the base and affecting the forming of the bottom surface of the box girder's inner cavity. During the demolding stage, the traveling wheels can extend downwards from the bottom surface of the base, supporting the bottom surface of the box girder's inner cavity. The reaction force lifts the base upwards, achieving demolding of the base. Simultaneously, when moving the inner mold assembly outwards, the traveling wheels reduce the friction between the inner mold assembly and the bottom surface of the box girder's inner cavity, effectively improving demolding efficiency. Both the first and second sliding plates can move downwards relative to their corresponding side molds, allowing both to demold from the inner wall of the box girder's inner cavity and reducing the overall height dimension of the inner mold assembly. The two side molds can be brought close together, thereby enabling the side molds to be demolded from the inner wall of the box girder cavity, while simultaneously narrowing the entire inner mold assembly in the width direction. Because the inner mold assembly is shorter in the height direction and narrower in the width direction, the overall cross-sectional dimension of the inner mold assembly can be smaller than the cross-sectional dimension of the box girder cavity. This significantly reduces the obstruction encountered by the inner mold assembly during outward movement, making the movement process smoother.

[0009] This invention provides an inner mold assembly for a box girder. Through the design of the first and second sliding plates, which can move vertically relative to the corresponding side molds, the inner mold assembly, when adapting to the axially varying cross-sectional shape of the box girder's inner cavity, eliminates the need for segmenting the top plate of one side of the inner mold assembly axially, as in existing technologies where the top plate rotates and folds downwards. In this invention, the top plate of one side of the inner mold assembly does not need to be flipped downwards; therefore, the top plate of one side can be designed as a single integral structure, enhancing the overall integrity of the mold, helping to reduce misalignment, and thus improving the forming quality of the box girder.

[0010] The two side molds can be driven to move closer and further apart using a jack, a telescopic cylinder, or a rack and pinion mechanism. The jack or cylinder can be connected between the two side molds, or between the base and the side molds. When using a rack and pinion mechanism, a rack is mounted on the side mold, and a gear meshing with the rack is provided on the base. Rotating the drive gear causes the rack to move linearly, thereby moving the side molds.

[0011] Preferably, a transverse hydraulic cylinder is provided between the base and the side mold, a transverse guide rod is provided on the inner side of the side mold, a guide sleeve is provided on the base, and the transverse guide rod is sleeved in the guide sleeve.

[0012] In this design, the transverse hydraulic cylinder can drive the side molds to move away from and towards the base, thereby enabling the side molds located on both sides of the base to move closer and further apart. However, placing the transverse hydraulic cylinder between the two side molds may result in one side mold moving under the action of the cylinder while the other remains stationary. This can cause one side mold to fail to detach smoothly from the mold during demolding, affecting the demolding effect and production efficiency. This design, however, ensures that both side molds move towards the center simultaneously under the drive of the transverse hydraulic cylinder, thus ensuring that both side molds can complete the demolding operation simultaneously, greatly improving demolding efficiency and stability.

[0013] Furthermore, the transverse guide rod and the guide sleeve can cooperate to achieve a guiding function. During the movement of the side mold, the guide sleeve provides a precise guide track for the transverse guide rod, ensuring that the side mold always moves in the predetermined direction, reducing problems such as offset and shaking of the side mold during movement, and further ensuring the smooth progress of the demolding process.

[0014] The method by which the first sliding plate and the second sliding plate can move up and down relative to the corresponding side mold can be a jack, a telescopic cylinder or a pneumatic telescopic rod.

[0015] Preferably, lifting cylinders are provided between the first sliding plate and the side mold located on the same side of the base, and between the second sliding plate and the side mold located on the same side of the base. The inner sides of the first sliding plate and the second sliding plate are respectively provided with a first sliding sleeve and a second sliding sleeve. The inner side of the side mold is provided with a guide post, which is sleeved in the first sliding sleeve or the second sliding sleeve.

[0016] In this design, the lifting cylinder drives the first or second sliding plate to move up and down. The first and second sliding sleeves cooperate with corresponding guide posts to provide guidance. During the up-and-down movement of the first and second sliding plates, the guide posts guide the first or second sliding plate, ensuring that they always move in a predetermined direction. This reduces the risk of offset or wobbling during movement, further guaranteeing a smooth demolding process.

[0017] Preferably, the bottom end of the first sliding sleeve is provided with a first positioning element, the bottom end of the second sliding sleeve is provided with a second positioning element, and the top end of the guide post is provided with a locking element, the locking element being used to connect with the first positioning element or the second positioning element.

[0018] In this design, the first positioning member, the second positioning member, and the locking member are used to lock the positional relationship between the first sliding plate and the side mold on the same side, and the positional relationship between the second sliding plate and the side mold on the same side, during the formwork support stage. This locking mechanism effectively prevents the first and second sliding plates from sliding downwards relative to the side mold, ensuring the stability of the inner mold assembly during the formwork support stage and subsequent pouring process.

[0019] Preferably, the guide post is provided with a guide hole, the first sliding sleeve is provided with a first guide pin, and the second sliding sleeve is provided with a second guide pin. Both the first guide pin and the second guide pin can pass through the corresponding guide hole. The path of the guide hole includes a parallel section and an inclined section. The parallel section is parallel to the plane where the side mold is located. The bottom end of the inclined section is connected to the top end of the parallel section. The top end of the inclined section is inclined outward.

[0020] In this design, the guide hole provides a guiding function, allowing the first guide pin and the second guide pin to move along a predetermined path. Since the first guide pin and the second guide pin are respectively connected to the first sliding sleeve and the second sliding sleeve, their movement indirectly guides the movement path of the first sliding sleeve and the second sliding sleeve.

[0021] Because the guide hole has a path structure consisting of the parallel segment and the inclined segment, when the first sliding sleeve and the second sliding sleeve move downwards, the first guide pin and the second guide pin move within the guide hole, causing the first sliding sleeve and the second sliding sleeve to first move inwards at an inward angle before moving downwards along the side mold. If the first sliding sleeve and the second sliding sleeve initially move directly downwards along the side mold, the side mold will obstruct the first sliding plate and the second sliding plate, causing the equipment to malfunction.

[0022] Preferably, the base includes a bottom plate, a web plate, and a top plate, the web plate being located between the bottom plate and the top plate, the bottom plate having a first notch for the traveling wheel to pass through, and a removable sealing element being provided at the first notch.

[0023] In this design, the base plate supports the web plate, and the web plate supports the top plate. During the demolding stage, the traveling wheels can extend through the first notch to the bottom surface of the base plate, facilitating the lifting of the base and moving the inner mold assembly. The sealing component is used to seal the first notch during the formwork erection and pouring stages to prevent concrete from overflowing from the first notch.

[0024] The walking wheels can move up and down either by directly driving them through a vertically arranged telescopic component, or indirectly through a lever mechanism, where a horizontally installed telescopic component drives a lever to move, thereby raising or lowering the walking wheels. The telescopic component can be a jack, an electric push rod, or a telescopic cylinder.

[0025] Preferably, the traveling wheel includes a roller and a rotating shaft. The axis of the rotating shaft is perpendicular to the web and rotatably connected to the web. The roller is connected to the rotating shaft via a first support arm. A second support arm is connected to the rotating shaft. By driving the second support arm to rotate around the axis of the rotating shaft, the roller can be driven to rotate around the axis of the rotating shaft, thereby enabling the roller to move up and down and pass through the first gap.

[0026] In this design, the roller rolls on the bottom surface of the box girder's inner cavity, simultaneously providing support. The web supports the rotating shaft, ensuring its stable rotation. The first arm, the rotating shaft, and the second arm form a lever mechanism. According to the lever principle, when the distance between the point of force application on the second arm and the axis of the rotating shaft is greater than the distance between the roller and the axis of the rotating shaft, this lever mechanism amplifies the driving force. This means that under the same driving input, the lever mechanism can allow the roller to obtain a greater force.

[0027] Furthermore, this lever mechanism allows the telescopic components driving the second arm to be arranged horizontally. This arrangement significantly reduces the space occupied by the telescopic components in the vertical direction, thereby freeing up more usable space in the vertical direction inside the inner mold assembly. This facilitates the rational layout of other components inside the inner mold assembly and the optimized design of the overall structure.

[0028] Preferably, the first sliding plate includes a first side wall plate and a first top panel, and the second sliding plate includes a second side wall plate and a second top panel. The first top panel is fixedly connected to the top edge of the first side wall plate, and the second top panel is rotatably connected to the top edge of the second side wall plate. The second top panel can be opened and closed.

[0029] In this design, the second top panel is rotatably connected to the top edge of the second side wall panel, allowing the second top panel to be opened and closed. When the second top panel is open, operators can directly perform various operations on the interior of the inner mold assembly from the second top panel. Without this design, after the inner mold assembly is installed, operators can only enter the interior through openings at both ends of the inner mold assembly to work. However, when the inner mold assembly is small, its internal space is extremely limited, and operators will face the problem of cramped operating space after entering through the openings, making operation extremely inconvenient. The ability of the second top panel to open and close effectively solves this problem, providing operators with more convenient operating conditions.

[0030] The second top panel can be a single piece of panel or it can be composed of multiple independent panels. If it is composed of multiple independent panels, each panel can be opened or closed independently.

[0031] Preferably, when the cross-sectional dimensions of the inner mold assembly change along the axial direction, the second top panel is divided into several segments along the axial direction of the inner mold assembly, and each segment is rotatably connected to the top edge of the second side wall panel. When there is a height difference between two adjacent segments, a movable cover plate is provided between the two adjacent segments.

[0032] In this design, because the cross-sectional dimensions of the inner mold assembly change along the axial direction, the rotation axes of each segment are not on the same straight line, so they need to be rotated separately. When there is a height difference between two adjacent segments, a movable cover plate that can be detached separately is provided to avoid obstructing the rotation and opening of the segments.

[0033] In a second aspect, the present invention provides a construction method for an inner formwork assembly, applied to an inner formwork assembly of a box girder as described in the first aspect, comprising the following steps: S1: Assemble the inner mold assembly and pour the box girder concrete; S2: After the concrete reaches the demolding strength, remove the sealing piece located at the first notch of the base, move the first sliding plate downward relative to the side mold on the same side, move the second sliding plate downward relative to the side mold on the same side, and move the side molds on both sides laterally towards the middle. S3: Extend the walking wheels downwards out of the bottom surface of the base and support them on the bottom surface of the inner cavity of the box girder, so that the base, the side mold, the first sliding plate and the second sliding plate are lifted upwards; S4: Pull the inner mold assembly out of the inner cavity of the box girder from one end of the box girder to complete the demolding operation of the inner mold assembly.

[0034] This invention provides a construction method for an inner mold assembly. The method involves moving a first sliding plate downwards relative to a side mold on the same side, and moving a second sliding plate downwards relative to a side mold on the same side, so that both the first and second sliding plates complete demolding. The side molds on both sides are then moved laterally towards the center, also completing demolding. The sealing piece at the first notch of the base is removed to allow the traveling wheel to extend downwards from the bottom surface of the base from the first notch. After the traveling wheel is supported on the bottom surface of the inner cavity of the box girder, it provides a reverse force to the base, thereby lifting the base, the side molds, the first sliding plate, and the second sliding plate upwards, completing the demolding of the base.

[0035] This invention provides a construction method for an inner mold assembly. By moving the first and second sliding plates downward relative to the corresponding side molds, the inner mold assembly can complete the demolding operation of the top surface of the box girder cavity in one go, adapting to the cross-sectional shape of the box girder cavity that changes along the axial direction. Unlike existing technologies, which require segmented demolding operations due to the downward rotation and folding of the top plate on one side of the inner mold assembly, this method achieves faster and more efficient demolding of the box girder cavity by demolding the top surface as a whole, significantly improving demolding efficiency.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention provides an inner mold assembly for a box girder. Through the design of the first sliding plate and the second sliding plate being able to move vertically relative to the corresponding side mold, the inner mold assembly, when adapting to the axially varying cross-sectional shape of the box girder's inner cavity, does not require, as in the prior art, segmenting the axially arranged top plate of the inner mold assembly due to its downward-rotating and folding mechanism. In this invention, the top plate of the inner mold assembly does not need to be flipped downwards; therefore, the top plate can be designed as a single integral structure, enhancing the overall integrity of the mold, helping to reduce misalignment, and thus improving the forming quality of the box girder. 2. This invention provides a construction method for an inner mold assembly. By moving the first sliding plate and the second sliding plate downward relative to the corresponding side mold, the inner mold assembly can complete the demolding operation of the top surface of the box girder cavity in one go when adapting to the cross-sectional shape of the box girder cavity that changes along the axial direction. Unlike existing technologies, which require segmenting the top plate of the inner mold assembly along the axial direction due to the downward rotation and folding of the top plate on one side, and thus requiring segmented demolding operations, this construction method, by demolding the top surface of the box girder cavity as a whole, makes the demolding operation of the box girder cavity faster and more efficient, significantly improving demolding efficiency. Attached Figure Description

[0037] Figure 1 This is a structural schematic diagram of the inner mold assembly of a box girder.

[0038] Figure 2 This is a right view of the inner formwork assembly of a box girder.

[0039] Figure 3 This is a schematic diagram of the first cross-section of a standard section of the inner formwork assembly of a box girder.

[0040] Figure 4 This is a schematic diagram of the second cross section of a standard segment of the inner formwork assembly of a box girder.

[0041] Figure 5 This is a schematic diagram of the base structure.

[0042] Figure 6 This is an enlarged schematic diagram showing the location of the guide sleeve on the base.

[0043] Figure 7 This is a schematic diagram of the side mold structure.

[0044] Figure 8 This is a schematic diagram of the structure of the first sliding plate.

[0045] Figure 9 This is a schematic diagram of the second sliding plate.

[0046] Figure 10This is a schematic diagram showing the connection relationship between the first side wall plate of the first sliding plate of the side mold or the second side wall plate of the second sliding plate.

[0047] Figure 11 This is a schematic diagram of the arrangement of the lifting cylinders.

[0048] Figure 12 This is a schematic diagram of the arrangement of the transverse hydraulic cylinders.

[0049] Figure 13 This is a schematic diagram of the sealing component.

[0050] Figure 14 This is a schematic diagram of the walking wheel.

[0051] Figure 15 This is a side elevation diagram of the traveling wheels during the formwork support stage.

[0052] Figure 16 This is a side elevation diagram of the traveling wheels during the demolding stage.

[0053] Figure 17 This is a front elevation view of the traveling wheels during the formwork support stage.

[0054] Figure 18 This is a front elevation view of the traveling wheels during the demolding stage.

[0055] Figure 19 This is a schematic diagram of the traveling wheels during the formwork support stage.

[0056] Figure 20 This is a schematic diagram of the traveling wheels during the demolding stage.

[0057] Figure 21 This is a first schematic diagram showing the first rotating plate, the second rotating plate, and the third rotating plate in the open state.

[0058] Figure 22 This is a second schematic diagram showing the first, second, and third rotating plates in the open state.

[0059] Figure 23 This is a schematic diagram showing the first, second, and third rotating plates in the closed state.

[0060] Figure 24 This is a schematic diagram showing the demolding sequence of the end section.

[0061] Figure 25 This is a schematic diagram of the demolding sequence for the descending section.

[0062] Figure 26 This is a schematic diagram of the demolding sequence for the standard section.

[0063] Marked in the image: 1-Base, 11-Base plate, 111-First notch, 12-Web plate, 121-First clamping plate, 122-Through hole, 123-Guide sleeve, 124-End plate, 125-Locking plate, 13-Top plate, 14-Traveling wheel, 141-Roller, 142-First support arm, 143-Rotating shaft, 144-Second support arm, 15-Sealing component, 151-Sealing plate, 152-Fixing component, 16-Traction connector, 17-Transfer trolley 2-Side mold, 21-Side plate, 211-Guide post, 2111-Guide hole, 2112-Locking element, 212-Transverse guide rod, 213-Third locking plate, 214-Second locking plate, 22-Rolled edge plate, 221-Third longitudinal beam, 222-Second notch, 223-Support. 3-First sliding plate, 31-First side wall panel, 311-First longitudinal beam, 312-First sliding sleeve, 3121-First positioning component, 3122-First guide pin, 313-Fourth retaining plate, 32-First top panel. 4-Second sliding plate, 41-Second side wall panel, 411-Second longitudinal beam, 412-Second sliding sleeve, 4121-Second positioning element, 4122-Second guide pin, 413-Fifth retaining plate, 42-Second top panel, 421-First rotating plate, 422-Second rotating plate, 423-Third rotating plate, 424-Modible cover plate, 43-Connecting plate 5-Vertical support, 6-Horizontal support, 7-Anti-buoyancy crossbeam, 8-Lifting cylinder, 9-Transverse hydraulic cylinder, 10 - Demolding cylinder. Detailed Implementation

[0064] The present invention will now be described in further detail with reference to specific embodiments. However, this 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.

[0065] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer," etc., used in the description of specific embodiments of the present invention to indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular 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 the present invention.

[0066] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, 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%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present invention.

[0067] 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.

[0068] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" 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.

[0069] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided 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 connection methods commonly used 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.

[0070] Example 1 like Figure 1 and Figure 2 As shown, an inner mold assembly for a box girder includes a base 1, two side molds 2, a first sliding plate 3, and a second sliding plate 4.

[0071] The base 1 is equipped with a traveling wheel 14, which can extend downwards from the bottom surface of the base 1 and retract upwards.

[0072] The two side molds 2 are located on both sides of the base 1, and the two side molds 2 can move closer to each other or further away.

[0073] The first sliding plate 3 and the second sliding plate 4 are slidably connected to the two side molds 2 respectively, and both the first sliding plate 3 and the second sliding plate 4 can move up and down relative to the corresponding side mold 2.

[0074] The base 1, side mold 2, first sliding plate 3, and second sliding plate 4 are molds used to enclose and form the internal cavity of the molded box beam.

[0075] The base 1 is used to form the bottom surface of the inner cavity of the box girder; the first sliding plate 3 and the second sliding plate 4 are used to form the top surface and the upper area of ​​the two sides of the inner cavity of the box girder; the two side molds 2 are used to form the lower area of ​​the two sides of the inner cavity of the box girder.

[0076] Specifically, such as Figure 3 and Figure 4 As shown, the side mold 2 includes a side plate 21 and a rolled edge plate 22. The rolled edge plate 22 is connected to the bottom edge of the side plate 21 and faces the base 1. A third longitudinal beam 221 is provided on the rolled edge plate 22. The third longitudinal beam 221 is arranged along the longitudinal direction of the rolled edge plate 22, that is, along the axial direction of the inner mold assembly. The third longitudinal beam 221 can be made of channel steel or square steel tube. The cross-sectional dimensions of the square steel tube can be 50mm×50mm or 60mm×60mm, and the wall thickness can be 4mm, 5mm, or 6mm. The third longitudinal beam 221 is used to enhance the rigidity of the rolled edge plate 22. The inner side of the side plate 21 can be provided with stiffening ribs to enhance the planar rigidity of the side plate 21.

[0077] In an optional embodiment, a transverse hydraulic cylinder 9 may be provided between the base 1 and the side mold 2, a transverse guide rod 212 may be provided on the inner side of the side mold 2, and a guide sleeve 123 may be provided on the base 1, with the transverse guide rod 212 sleeved in the guide sleeve 123.

[0078] Specifically, such as Figure 12 As shown, the transverse hydraulic cylinder 9 is arranged horizontally through the base 1, with both ends of the transverse hydraulic cylinder 9 extending to the left and right sides of the base 1, respectively. Figure 5 , Figure 6 and Figure 10 As shown, a first retaining plate 121 is installed on both sides of the base 1; correspondingly, as Figure 7 and Figure 10 As shown, a second clamping plate 214 is provided at a corresponding position on the inner side of the side mold 2. One end of the transverse hydraulic cylinder 9 is hinged to the first clamping plate 121 on one side of the base 1 by means of a pin, and the other end is hinged to the second clamping plate 214 on the inner side of the side mold 2 by means of a pin.

[0079] The axial direction of the guide sleeve 123 is perpendicular to the axis of the base 1, and both the guide sleeve 123 and the transverse guide rod 212 have a certain angle with the horizontal plane, so that the side mold 2 can move obliquely upward when it moves laterally toward the base 1. An end plate 124 is provided at the end of the guide sleeve 123 away from the transverse guide rod 212, and this end plate 124 is connected to the outer wall of the end of the guide sleeve 123. A screw hole is provided on the end face of the transverse guide rod 212 near the guide sleeve 123.

[0080] When the side mold 2 moves laterally toward the base 1, the lateral guide rod 212 can be inserted into the guide sleeve 123, and the end of the lateral guide rod 212 with the screw hole will be aligned with the end of the guide sleeve 123 where the end plate 124 is mounted. At this time, using the locking plate 125 with the screw hole and bolts, the end plate 124 and the end of the lateral guide rod 212 with the screw hole are fixedly connected together. This design can effectively prevent the side mold 2 and the base 1 from separating during the dragging of the entire inner mold assembly.

[0081] In optional implementations, such as Figure 11 As shown, lifting cylinders 8 can be provided between the first sliding plate 3 and the side mold 2 located on the same side of the base 1, and between the second sliding plate 4 and the side mold 2 located on the same side of the base 1. Figure 8 and Figure 9 As shown, the inner sides of the first sliding plate 3 and the second sliding plate 4 can be respectively provided with a first sliding sleeve 312 and a second sliding sleeve 412, such as... Figure 7 and Figure 10 As shown, the inner side of the side mold 2 may be provided with a guide post 211, which is sleeved in the first sliding sleeve 312 or the second sliding sleeve 412.

[0082] Specifically, both the first sliding sleeve 312 and the second sliding sleeve 412 can be made of two channel steels arranged back to back. The guide post 211 can be made of square steel tubing. The cross-sectional dimensions of the square steel tubing are adapted to the gap between the two channel steels, and the square steel tubing can be inserted into the gap between the channel steels.

[0083] The inner side of the first sliding plate 3 is provided with a fourth clamping plate 313, the inner side of the second sliding plate 4 is provided with a fifth clamping plate 413, and the inner side of the side mold 2 is provided with a third clamping plate 213. The top end of the lifting cylinder 8 located on one side of the first sliding plate 3 is hinged to the fourth clamping plate 313 by a pin, and the top end of the lifting cylinder 8 located on one side of the second sliding plate 4 is hinged to the fifth clamping plate 413 by a pin. The bottom end of the lifting cylinder 8 is hinged to the third clamping plate 213 on the corresponding side by a pin.

[0084] The inner side of the first sliding plate 3 may be provided with a plurality of first sliding sleeves 312, the axes of the plurality of first sliding sleeves 312 being parallel to each other; the inner side of the second sliding plate 4 may be provided with a plurality of second sliding sleeves 412, the axes of the plurality of second sliding sleeves 412 being parallel to each other.

[0085] In optional implementations, such as Figure 8 and Figure 9 As shown, the bottom end of the first sliding sleeve 312 may be provided with a first positioning member 3121, and the bottom end of the second sliding sleeve 412 may be provided with a second positioning member 4121, such as... Figure 10 As shown, the top of the guide post 211 may be provided with a locking member 2112, which is used to connect with the first positioning member 3121 or the second positioning member 4121.

[0086] Specifically, during the formwork support stage, both the first sliding sleeve 312 and the second sliding sleeve 412 can slide to their highest positions relative to the corresponding guide posts 211. At this time, the first positioning element 3121 on the first sliding sleeve 312 and the second positioning element 4121 on the second sliding sleeve 412 can respectively contact and abut against the locking element 2112 on the corresponding guide posts 211. The first positioning element 3121 and the second positioning element 4121 are respectively connected to the corresponding locking element 2112 by bolts, preventing the first sliding plate 3 and the second sliding plate 4 from sliding downward relative to the side mold 2, thus ensuring the stability during the formwork support stage.

[0087] In an optional embodiment, the guide post 211 may be provided with a guide hole 2111, the first sliding sleeve 312 may be provided with a first guide pin 3122, and the second sliding sleeve 412 may be provided with a second guide pin 4122. Both the first guide pin 3122 and the second guide pin 4122 can pass through the corresponding guide hole 2111. The path of the guide hole 2111 includes a parallel section and an inclined section. The parallel section is parallel to the plane where the side mold 2 is located. The bottom end of the inclined section is connected to the top end of the parallel section. The top end of the inclined section is inclined outward.

[0088] In optional implementations, such as Figure 3 , Figure 5 , Figure 6 and Figure 10 As shown, the base 1 may include a bottom plate 11, a web plate 12 and a top plate 13. The web plate 12 is located between the bottom plate 11 and the top plate 13. The bottom plate 11 is provided with a first notch 111 for the walking wheel 14 to pass through. A detachable sealing member 15 is provided at the first notch 111.

[0089] Specifically, the base plate 11 has an isosceles trapezoidal cross-section, and the two hypotenuses of the isosceles trapezoid support the rolled edge plate 22 of the side mold 2. Two web plates 12 are connected to the top edge of the isosceles trapezoid, with a certain gap between them. A guide sleeve 123 passes through both web plates 12. A through hole 122 is provided on the web plate 12 for the transverse hydraulic cylinder 9 to pass through.

[0090] like Figure 4 and Figure 7 As shown, the base 1 can also be equipped with an anti-buoyancy beam 7. The anti-buoyancy beam 7 is horizontally arranged and passes through both web plates 12. The axis of the anti-buoyancy beam 7 is perpendicular to the axis of the base 1, and both ends of the anti-buoyancy beam 7 extend outward from the web plates 12 on both sides. On the rolled edge plate 22, supports 223 are respectively provided at positions corresponding to the two ends of the anti-buoyancy beam 7. The two ends of the anti-buoyancy beam 7 are abutted against the corresponding supports 223 by anti-buoyancy bolts. Specifically, the anti-buoyancy bolts pass through the ends of the anti-buoyancy beam 7 in a vertical direction, and the bottom end of the anti-buoyancy bolts contacts the supports 223. By utilizing the synergistic effect of the anti-buoyancy beam 7 and the anti-buoyancy bolts, the anti-buoyancy beam 7 and the base plate 11 of the base 1 can jointly clamp the rolled edge plate 22, thereby preventing the side formwork 2 from floating during the concrete pouring process.

[0091] like Figure 7As shown, a second notch 222 can be made on the rolled edge plate 22 at the position corresponding to the first notch 111 on the base 1. During the formwork support stage, the first notch 111 and its corresponding second notch 222 together form a square hole, which is sealed by the sealing member 15. The reason for setting the second notch 222 is that during the demolding stage, when the side mold 2 moves closer to the base 1, the rolled edge plate 22 will also move towards the base 1, which may cover the first notch 111. The setting of the second notch 222 can effectively avoid this situation and ensure that the traveling wheel 14 can pass through the first notch 111 normally.

[0092] like Figure 13 As shown, the sealing component 15 may include a sealing plate 151 and a fixing member 152. The shape and size of the sealing plate 151 perfectly match the square hole, and can completely cover the square hole. The fixing member 152 is fixedly installed on the upper surface of the sealing plate 151, and the function of the fixing member 152 is to securely connect the entire sealing component 15 to the rolled edge plate 22. The fixing member 152 may be made of channel steel. In addition, a threaded post is pre-set on the rolled edge plate 22. During installation, the threaded post can pass through the fixing member 152, and then be tightened by the matching nut, thereby realizing the connection between the sealing component 15 and the rolled edge plate 22.

[0093] In optional implementations, such as Figure 14 As shown, the traveling wheel 14 may include a roller 141 and a rotating shaft 143. The axis of the rotating shaft 143 is perpendicular to the web plate 12 and is rotatably connected to the web plate 12. The roller 141 is connected to the rotating shaft 143 through a first support arm 142. A second support arm 144 is connected to the rotating shaft 143. By driving the second support arm 144 to rotate around the axis of the rotating shaft 143, the roller 141 can be driven to rotate around the axis of the rotating shaft 143, thereby enabling the roller 141 to move up and down and pass through the first notch 111.

[0094] Figure 15 , Figure 17 as well as Figure 19 The image shows roller 141 in its retracted state, located inside the inner mold assembly. Figure 16 , Figure 18 and Figure 20 The display shows the state of the roller 141 extending from the bottom surface of the inner mold assembly through the first notch 111.

[0095] Specifically, the rotating shaft 143 is horizontally arranged, with both ends protruding from the outer sides of the two webs 12. Both ends of the rotating shaft 143 are connected to rollers 141 via a first support arm 142. The second support arm 144 is located in the gap between the two webs 12. Figure 15 and Figure 16As shown, a demolding cylinder 10 is also provided in the gap between the two web plates 12. The two ends of the demolding cylinder 10 are respectively hinged to the second support arm 144 and the web plate 12 by pins. By controlling the extension and retraction of the demolding cylinder 10, the roller 141 can be moved up and down.

[0096] In an optional embodiment, the first sliding plate 3 may include a first side wall plate 31 and a first top panel 32, and the second sliding plate 4 may include a second side wall plate 41 and a second top panel 42. The first top panel 32 is fixedly connected to the top edge of the first side wall plate 31, and the second top panel 42 is rotatably connected to the top edge of the second side wall plate 41. The second top panel 42 can be opened and closed.

[0097] Specifically, a first longitudinal beam 311 is provided on the inner side of the first side wall panel 31, and the first longitudinal beam 311 is arranged along the axial direction of the inner mold assembly. A second longitudinal beam 411 is provided on the inner side of the second side wall panel 41, and the second longitudinal beam 411 is arranged along the axial direction of the inner mold assembly. The first longitudinal beam 311 is used to strengthen the rigidity of the first side wall panel 31, and the second longitudinal beam 411 is used to strengthen the rigidity of the second side wall panel 41. During the formwork support stage, a horizontal support 6 can be provided between the first longitudinal beam 311 and the second longitudinal beam 411. The horizontal support 6 has a length adjustment function and can support the first longitudinal beam 311 and the second longitudinal beam 411, preventing the first sliding plate 3 and the second sliding plate 4 from converging towards the middle, thereby ensuring the stability of the inner mold assembly during the formwork support stage.

[0098] The first top panel 32 and the second top panel 42 can be spliced ​​together to form the top surface of the inner mold assembly. The first top panel 32 and the second top panel 42 can be connected by bolts. At the splicing edge of the first top panel 32 and the second top panel 42, the first top panel 32 is provided with a first oblique cut that slopes upwards, and the second top panel 42 is provided with a second oblique cut that slopes downwards. When splicing, the second oblique cut can be supported precisely on the first oblique cut.

[0099] An adjustable-length vertical support 5 is installed between the inner side of the joint between the first top panel 32 and the second top panel 42 and the base 1. This vertical support 5 is used to provide support for the first top panel 32 and the second top panel 42, preventing the first sliding plate 3 and the second sliding plate 4 from sinking due to their own weight, thereby ensuring that the inner mold assembly remains stable during the mold-building stage.

[0100] During the formwork support stage, the bottom edge of the first side wall panel 31 and the top edge of the corresponding side panel 21, as well as the second side wall panel 41 and the top edge of the corresponding side panel 21, can be fixed with bolts.

[0101] Specifically, the first side wall plate 31 is parallel to the corresponding side plate 21, and the axial direction of the first sliding sleeve 312 is parallel to the first side wall plate 31; the second side wall plate 41 is parallel to the top edge of the corresponding side plate 21, and the axial direction of the second sliding sleeve 412 is parallel to the second side wall plate 41.

[0102] In an optional embodiment, when the cross-sectional dimensions of the inner mold assembly change along the axial direction, the second top panel 42 can be divided into several segments along the axial direction of the inner mold assembly. Each segment is rotatably connected to the top edge of the second side wall panel 41. When there is a height difference between two adjacent segments, a movable cover plate 424 can be provided between the two adjacent segments.

[0103] Specifically, such as Figure 2 As shown, the inner mold assembly may include a standard section, a descending section, and an end section. The descending section is located between the standard section and the end section. The top surface of the descending section is lower than the top surface of the standard section. The top surface of the end section is flush with the top surface of the descending section. The cross-sectional width of the end section is smaller than the cross-sectional width of the descending section. Figures 21 to 23 As shown, the second top panel 42 may include a first rotating plate 421, a second rotating plate 422, and a third rotating plate 423. The first rotating plate 421 is located in the standard section, the second rotating plate 422 is located in the descending section, and the third rotating plate 423 is located in the end section. The first rotating plate 421, the second rotating plate 422, and the third rotating plate 423 are all rotatably connected to the top edge of the second side wall panel 41. A movable cover plate 424 is provided between the first rotating plate 421 and the second rotating plate 422.

[0104] Because the cross-sectional dimensions of the standard section, the descending section, and the end section are different, the rotation axes of the first rotating plate 421, the second rotating plate 422, and the third rotating plate 423 located in these three sections are not on the same straight line, so they need to be rotated and connected separately. Furthermore, because there is a height difference between the top surface of the standard section and the top surface of the descending section, a movable cover plate 424 is provided between the first rotating plate 421 and the second rotating plate 422. When it is necessary to open the first rotating plate 421 and the second rotating plate 422, the movable cover plate 424 can be removed separately, thus not obstructing the rotation and opening of the first rotating plate 421 and the second rotating plate 422.

[0105] Specifically, the first rotating plate 421, the second rotating plate 422, and the third rotating plate 423 are all connected to the top edge of the second side wall plate 41 via a connecting plate 43. The connecting plate 43 is C-shaped or U-shaped, with one end fixedly connected to the first rotating plate 421, the second rotating plate 422, or the third rotating plate 423, and the other end hinged to the top edge of the second side wall plate 41. The movable cover plate 424 is arranged at an angle and is connected to the first rotating plate 421 and the second rotating plate 422 respectively via bolts.

[0106] In an optional embodiment, a translation trolley 17 can be mounted on the base 1. The bottom of the translation trolley 17 is equipped with moving wheels and snap-on wheels. The translation trolley 17 is supported on the top surface of the top plate 13 by the moving wheels, while the snap-on wheels are located on the bottom surface of the top plate 13. The translation trolley 17 can move along the axial direction of the base 1, thereby enabling the operator to move inside the inner mold assembly, allowing the operator to enter the cavity more conveniently to carry out work. The operator can lie or crawl on the translation trolley 17 to move, dealing with the narrow inner cavity of the inner mold assembly. In this way, the safety risks and inefficiencies that may occur when the operator walks directly inside the inner mold assembly are avoided.

[0107] Example 2 A construction method for an inner formwork component, applied to an inner formwork component of a box girder as described in Example 1, includes the following steps: S1: Assemble the inner mold components and pour the box girder concrete.

[0108] Specifically, the outer formwork assembly of the box girder is constructed first, followed by the binding of the box girder's reinforcing bars. Then, the base 1, side formwork 2, first sliding plate 3, and second sliding plate 4 of the inner formwork assembly are deployed, and the sealing component 15 is installed at the first notch 111. The traveling wheels 14 are retracted upwards into the internal space of the inner formwork assembly, and vertical supports 5 and horizontal supports 6 are installed. Finally, the concrete for the box girder is poured.

[0109] The joints of the template can be treated with adhesive tape, the joints of the bottom template can be treated with butyl tape, and the top surfaces of the first sliding plate 3 and the second sliding plate 4 can be coated with film.

[0110] S2: After the concrete reaches the demolding strength, remove the sealing piece 15 located at the first notch 111 of the base 1, move the first sliding plate 3 downward relative to the side mold 2 on the same side, move the second sliding plate 4 downward relative to the side mold 2 on the same side, and move the side molds 2 on both sides laterally towards the middle.

[0111] Specifically, remove the sealing component 15, vertical support 5, and horizontal support 6. For example... Figures 24 to 26As shown, the lifting cylinder 8 located on one side of the first sliding plate 3 is activated to retract downwards. Driven by the lifting cylinder 8, the first sliding plate 3 moves downwards, completing the demolding of the first sliding plate 3. Then, the lifting cylinder 8 located on one side of the second sliding plate 4 is activated to retract downwards. Driven by the lifting cylinder 8, the second sliding plate 4 moves downwards, completing the demolding of the second sliding plate 4. Alternatively, the first sliding plate 3 can be lowered by about 100mm while the second sliding plate 4 begins to lower simultaneously for a faster operation. Figures 24 to 26 They were shown respectively Figure 2 The state changes of the inner mold assembly during the demolding stage at sections AA, BB, and CC.

[0112] The transverse cylinder 9 is activated to retract laterally. Driven by the transverse cylinder 9, the side molds 2 on both sides move laterally toward the base 1 located in the middle, completing the demolding of the side molds 2. When the side molds 2 move laterally, they can drive the first sliding plate 3 and the second sliding plate 4 to move toward the middle together.

[0113] S3: Extend the walking wheel 14 downwards out of the bottom surface of the base 1 and support it on the bottom surface of the inner cavity of the box girder, so that the base 1, side mold 2, first sliding plate 3 and second sliding plate 4 are lifted upwards.

[0114] Specifically, the demolding cylinder 10 is activated, which drives the roller 141 of the traveling wheel 14 to rotate around the rotating shaft 143 and extend downwards out of the bottom surface of the base 1. Through the reaction force, the base 1 is lifted upwards, thus completing the demolding of the base 1.

[0115] S4: Pull the inner mold assembly out of the inner cavity of the box girder from one end of the box girder to complete the demolding operation of the inner mold assembly.

[0116] Specifically, the inner mold assembly can be connected to the towing device via the traction connector 16. The traction connector 16 is bolted to one end of the base 1. When towing the inner mold assembly, the roller 141 can roll on the bottom surface of the inner cavity of the box girder, thereby reducing the frictional resistance during towing.

[0117] The construction method for an internal mold component provided by this invention also has the following advantages.

[0118] This solves the problem that hydraulic internal molds cannot be used in the narrow, low, and confined cavities of box girders in traditional scenarios.

[0119] This invention addresses the problem of difficult personnel access when modifying the internal mold of a traditional hydraulic box girder to accommodate bolts or pins. It reduces the number of times personnel need to enter, requiring only one entry via a translating trolley 17 when necessary to install or remove bolts, sealing components 15, vertical supports 5, and horizontal supports 6. The translating trolley 17 enters from one end of the base 1 and exits from the other.

[0120] This invention solves the problems of excessive formwork sections and cumbersome installation and disassembly in traditional internal molds. It allows for one-time mold removal and pull-out of the beam, greatly improving the demolding efficiency of the internal mold components.

[0121] Traditional box girder internal formwork construction involves simple mechanical folding and piecemeal assembly. Workers operate within extremely confined spaces, resulting in high risks, high labor intensity, and low efficiency. This invention mechanizes the assembly of box girder internal formwork components using hydraulic cylinders, significantly reducing labor intensity and the number of workers required. It substantially saves labor costs, increases production efficiency in girder manufacturing, reduces the number of times workers need to enter confined spaces, and lowers labor intensity and safety risks.

[0122] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An inner mold assembly for a box girder, characterized in that, include: The base (1) is provided with a walking wheel (14), which can extend downwards out of the bottom surface of the base (1) and retract upwards; Two side molds (2) are located on both sides of the base (1), and the two side molds (2) can move closer to each other and further away from each other; The first sliding plate (3) and the second sliding plate (4) are slidably connected to the two side molds (2) respectively. The first sliding plate (3) and the second sliding plate (4) can move up and down relative to the corresponding side mold (2). The base (1), the side mold (2), the first sliding plate (3), and the second sliding plate (4) are used to enclose the mold that forms the internal cavity of the molded box beam.

2. The inner mold assembly for a box girder according to claim 1, characterized in that, A transverse hydraulic cylinder (9) is provided between the base (1) and the side mold (2). A transverse guide rod (212) is provided on the inner side of the side mold (2). A guide sleeve (123) is provided on the base (1). The transverse guide rod (212) is sleeved in the guide sleeve (123).

3. The inner mold assembly for a box girder according to claim 1, characterized in that, Lifting cylinders (8) are provided between the first sliding plate (3) and the side mold (2) located on the same side of the base (1), and between the second sliding plate (4) and the side mold (2) located on the same side of the base (1). The inner sides of the first sliding plate (3) and the second sliding plate (4) are respectively provided with a first sliding sleeve (312) and a second sliding sleeve (412). The inner side of the side mold (2) is provided with a guide post (211), and the guide post (211) is sleeved in the first sliding sleeve (312) or the second sliding sleeve (412).

4. The inner mold assembly for a box girder according to claim 3, characterized in that, The bottom end of the first sliding sleeve (312) is provided with a first positioning member (3121), the bottom end of the second sliding sleeve (412) is provided with a second positioning member (4121), and the top end of the guide post (211) is provided with a locking member (2112). The locking member (2112) is used to connect with the first positioning member (3121) or the second positioning member (4121).

5. The inner mold assembly for a box girder according to claim 4, characterized in that, The guide post (211) is provided with a guide hole (2111), the first sliding sleeve (312) is provided with a first guide pin (3122), and the second sliding sleeve (412) is provided with a second guide pin (4122). The first guide pin (3122) and the second guide pin (4122) can both pass through the corresponding guide hole (2111). The path of the guide hole (2111) includes a parallel section and an inclined section. The parallel section is parallel to the plane where the side mold (2) is located. The bottom end of the inclined section is connected to the top end of the parallel section. The top end of the inclined section is inclined outward.

6. The inner mold assembly for a box girder according to any one of claims 1-5, characterized in that, The base (1) includes a bottom plate (11), a web plate (12) and a top plate (13). The web plate (12) is located between the bottom plate (11) and the top plate (13). The bottom plate (11) has a first notch (111) for the walking wheel (14) to pass through. A detachable sealing element (15) is provided at the first notch (111).

7. The inner mold assembly for a box girder according to claim 6, characterized in that, The walking wheel (14) includes a roller (141) and a rotating shaft (143). The axis of the rotating shaft (143) is perpendicular to the web plate (12) and is rotatably connected to the web plate (12). The roller (141) is connected to the rotating shaft (143) through a first support arm (142). A second support arm (144) is connected to the rotating shaft (143). By driving the second support arm (144) to rotate around the axis of the rotating shaft (143), the roller (141) can be driven to rotate around the axis of the rotating shaft (143), thereby enabling the roller (141) to move up and down and pass through the first notch (111).

8. The inner mold assembly for a box girder according to claim 6, characterized in that, The first sliding plate (3) includes a first side wall plate (31) and a first top panel (32). The second sliding plate (4) includes a second side wall plate (41) and a second top panel (42). The first top panel (32) is fixedly connected to the top edge of the first side wall plate (31). The second top panel (42) is rotatably connected to the top edge of the second side wall plate (41). The second top panel (42) can be opened and closed.

9. The inner mold assembly of a box girder according to claim 8, characterized in that, When the cross-sectional dimensions of the inner mold assembly change along the axial direction, the second top panel (42) is divided into several segments along the axial direction of the inner mold assembly. Each segment is rotatably connected to the top edge of the second side wall panel (41). When there is a height difference between two adjacent segments, a movable cover plate (424) is provided between the two adjacent segments.

10. A construction method for an internal mold component, characterized in that, An inner formwork assembly for a box girder as described in any one of claims 1-9 includes the following steps: S1: Assemble the inner mold assembly and pour the box girder concrete; S2: After the concrete reaches the demolding strength, remove the sealing piece (15) at the first notch (111) of the base (1), move the first sliding plate (3) downward relative to the side mold (2) on the same side, move the second sliding plate (4) downward relative to the side mold (2) on the same side, and move the side molds (2) on both sides laterally towards the middle. S3: Extend the walking wheel (14) downwards out of the bottom surface of the base (1) and support it on the bottom surface of the inner cavity of the box beam, so that the base (1), the side mold (2), the first sliding plate (3) and the second sliding plate (4) are lifted upwards; S4: Pull the inner mold assembly out of the inner cavity of the box girder from one end of the box girder to complete the demolding operation of the inner mold assembly.

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