A retractable mechanism and method for a box girder internal formwork

Abstract

The present invention discloses a retracting and extending mechanism and method for an internal formwork of a box girder. A retracting and extending mechanism for an internal formwork of a box girder includes: an internal formwork, which includes a left side formwork, a right side formwork, and a bottom longitudinal beam formwork, and further includes: a combined component, which is hinged to the internal formwork; in a first state, the left side formwork and the right side formwork are respectively located on both sides of the bottom longitudinal beam formwork, and the lower end surfaces of the left side formwork, the right side formwork, and the bottom longitudinal beam formwork are located on the same horizontal plane; in a second state, at least part of the bottom longitudinal beam formwork is located within the enclosed space formed by the left side formwork and the right side formwork. For this retracting and extending mechanism of the internal formwork of the box girder, the horizontal movement of the left side formwork and the right side formwork is converted into the vertical lifting of the bottom longitudinal beam formwork through the telescoping of the combined component, so that the synchronous closing and unfolding of the internal formwork can be achieved, the automatic retracting and extending of the internal formwork of the precast highway box girder can be realized, and the problem of difficult automatic retracting and extending of the internal formwork of the precast highway box girder with a small internal cavity height-width ratio can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of precast highway box girder construction, and particularly relates to a receiving and discharging mechanism and method for an inner form of a box girder. Background Art

[0002] A box girder is a type of beam in bridge engineering, with a hollow interior and flanges on both upper sides, similar to a box. Reinforced concrete box girders are divided into precast box girders and cast-in-situ box girders. Precast box girders fabricated in an independent site can be erected after the completion of the lower works in combination with a bridge erecting machine, which can accelerate the project progress and save the construction period. Cast-in-situ box girders are mostly used in large continuous bridges. Precast highway box girders are structural components widely used in highway bridge construction, belonging to a type of precast concrete beam, usually made of prestressed concrete or ordinary concrete. Precast box girders have high strength, good durability, and due to being precast in a factory, they have a short construction period and controllable quality, and are widely used in the construction of medium and large-span bridges.

[0003] In highway bridge construction, the application of precast highway box girders is becoming more and more common, and the structure of precast highway box girders is also constantly changing with the development of technology. Traditional inner forms of highway box girders mostly adopt a scattered block combination mode, with slow installation, and generally bolt connections between each part. They are completely installed and removed manually one by one. When demolding, operators also need to enter the box chamber to operate, resulting in a large labor intensity for the operators and a high safety risk. Currently, some box girders with larger inner cavity dimensions, such as railway box girders, start to be equipped with a hydraulic system to gradually realize hydraulic automatic receiving and discharging of the formwork. However, for some small highway box girders with smaller dimensions, especially the inner cavity of small highway box girders with a small height-width ratio, although their transverse dimension is large, their height is low, resulting in limited space for receiving and discharging the formwork, and it is very difficult to arrange a hydraulic system to achieve automatic operation. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that it is difficult to use the existing hydraulic system to achieve automatic receiving and discharging of the formwork for the inner cavity of small highway box girders with a small height-width ratio, and to propose a receiving and discharging mechanism and method for an inner form of a box girder.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A receiving and discharging mechanism for an inner form of a box girder, comprising: an inner form, the inner form includes: a left template, a right template and a bottom longitudinal beam template, and further includes: a combination member, the combination member is hinged to the inner form;

[0007] A driving device, the driving device is used to drive the combination member to expand and contract, so that the inner form can achieve at least two states;

[0008] In the first state, the left template and the right template are respectively located on both sides of the bottom longitudinal beam template, and the lower end surfaces of the left template and the right template and the lower end surface of the bottom longitudinal beam template are located on the same horizontal plane;

[0009] In the second state, at least a part of the bottom longitudinal beam template is located within the enclosed space formed by the left template and the right template.

[0010] As a further solution of the present invention: The assembly includes a link group, and the link group includes a second link, a third link and two first links;

[0011] Wherein, one ends of the two first links are hinged to each other and hinged to the left template, and one of the first links is in an upward rotation state, and the other first link is in a downward rotation state;

[0012] One end of the second link is hinged to the bottom longitudinal beam template, and the other end is hinged to the upward rotation end of the upward rotation first link, and the second link is arranged in parallel with the downward rotation first link;

[0013] One end of the third link is hinged to the bottom longitudinal beam template, and the other end is hinged to the left template, and the third link is arranged in parallel with the upward rotation first link.

[0014] As a further solution of the present invention: The downward rotation first link and the second link are both hinged to the third link while maintaining a parallel state.

[0015] As a further solution of the present invention: Two link groups are provided, and the two link groups are symmetrically arranged along the central axis of the bottom longitudinal beam template;

[0016] Wherein, the second links in the two link groups are hinged to each other at the ends located at the central axis and hinged to the bottom longitudinal beam template;

[0017] The third links in the two link groups are hinged to each other at the ends located at the central axis and hinged to the bottom longitudinal beam template.

[0018] As a further solution of the present invention: A first mounting seat is provided inside the left template, the hinge point of the first link at the first mounting seat is a first sliding hinge point, and the hinge point of the first mounting seat and the third link is a first fixed hinge point.

[0019] As a further solution of the present invention: A second mounting seat is provided inside the right template, the hinge point of the first link at the second mounting seat is a second sliding hinge point, and the hinge point of the second mounting seat and the third link is a second fixed hinge point.

[0020] As a further solution of the present invention: a third mounting seat is provided on the top of the bottom longitudinal beam formwork, the hinge point of the second connecting rod at the third mounting seat is the third sliding hinge point, and the hinge point of the third mounting seat and the third connecting rod is the third fixed hinge point.

[0021] As a further solution of the present invention: the first mounting seat is provided with a first chute. In the connecting rod group connected to the left template, when the included angle between the downward-rotating first connecting rod and the third connecting rod changes, the first sliding hinge point slides up and down in the first chute.

[0022] As a further solution of the present invention: the second mounting seat is provided with a second chute. In the connecting rod group connected to the right template, when the included angle between the downward-rotating first connecting rod and the third connecting rod changes, the second sliding hinge point slides up and down in the second chute.

[0023] As a further solution of the present invention: the third mounting seat is provided with a third chute. In any connecting rod group, when the included angle between the second connecting rod and the third connecting rod changes, the third sliding hinge point slides up and down in the third chute.

[0024] As a further solution of the present invention: the driving device is an oil cylinder, the oil cylinder is arranged between the left template and the right template, and the oil cylinder can drive the left template and the right template to perform horizontal opening and closing movements.

[0025] A method for receiving and withdrawing an internal formwork of a box girder, using the receiving and withdrawing mechanism of the internal formwork of the box girder to receive the formwork, including:

[0026] In the first state, drive the left template and the right template to move horizontally away from each other, the included angle between the two third connecting rods in the assembly increases, the third fixed hinge point moves downward, and the bottom longitudinal beam formwork moves downward until the lower end surfaces of the left template, the right template, and the bottom longitudinal beam formwork are on the same horizontal plane, and the formwork support is completed;

[0027] In the second state, drive the left template and the right template to move horizontally towards each other, the included angle between the two third connecting rods in the assembly decreases, the third fixed hinge point moves upward, and the bottom longitudinal beam formwork moves upward until the bottom longitudinal beam formwork is completely within the enclosed space formed by the left template and the right template, and the formwork receiving is completed.

[0028] As a further solution of the present invention: when the bottom longitudinal beam formwork moves, based on the limitation of the third sliding hinge point by the third chute, the third sliding hinge point slides in the third chute, so that the movement direction of the bottom longitudinal beam formwork remains vertical.

[0029] Advantages of the present invention:

[0030] (1) In the present invention, the horizontal movement of the left template and the right template is converted into the vertical lifting of the bottom longitudinal beam template through the telescoping of the assembly, enabling the synchronous closing and unfolding of the inner mold, and then presenting the first state or the second state, thereby realizing the automatic retraction and extension of the inner mold of the precast highway box girder without manual intervention, saving time, reducing the labor intensity of the operators, and improving the efficiency of mold retraction and extension and the service life of the mold.

[0031] (2) In the present invention, the assembly is linked by multiple connecting rods in the connecting rod group to achieve the two-way movement conversion under single-degree-of-freedom control in the limited inner mold space, solving the problem of difficult automatic retraction and extension of the inner mold of the precast highway box girder with a small inner cavity height-width ratio.

[0032] (3) In the present invention, the three sliding hinge points cooperate with the corresponding chutes respectively to restrict the movement of the template along the designed direction, making the mold retraction and extension smoother. Description of the Drawings

[0033] The present invention will be further described below with reference to the drawings.

[0034] Figure 1 is a schematic structural diagram of the retraction and extension mechanism of the box girder inner mold of the present invention;

[0035] Figure 2 is a schematic structural diagram of the retraction and extension mechanism of the box girder inner mold of the present invention in the first state;

[0036] Figure 3 is a schematic structural diagram of the retraction and extension mechanism of the box girder inner mold of the present invention in the first state;

[0037] Figure 4 is a schematic structural diagram of the retraction and extension mechanism of the box girder inner mold of the present invention in the second state;

[0038] Figure 5 is a schematic flow diagram of the retraction and extension method of the box girder inner mold of the present invention.

[0039] In the figure:

[0040] 1. Left template; 2. Right template; 3. First mounting seat; 31. First chute; 4. Second mounting seat; 41. Second chute; 5. Oil cylinder; 6. Bottom longitudinal beam template; 7. Third mounting seat; 71. Third chute; 8. Assembly; 81. First connecting rod; 82. Second connecting rod; 83. Third connecting rod; 84. First sliding hinge point; 85. Third sliding hinge point; 86. Second sliding hinge point; 87. First fixed hinge point; 88. Third fixed hinge point; 89. Second fixed hinge point. Detailed Embodiments

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] Please refer to Figure 1 As shown, the present invention is a retractable mechanism for an internal formwork of a box girder, including an internal formwork, which includes: a left template 1, a right template 2, and a bottom longitudinal beam template 6. It also includes: an assembly 8, and the assembly 8 is hinged to the internal formwork.

[0043] Wherein, a driving device is arranged between the left template 1 and the right template 2, and the driving device is used to drive the assembly 8 to expand and contract, so that the internal formwork can achieve at least two states. The driving device includes but is not limited to an oil cylinder, a cylinder, and a thruster. Preferably, an oil cylinder 5 is used, and the oil cylinder 5 is used to drive the left template 1 and the right template 2 to perform horizontal opening and closing movements, and the opening and closing amount can be controlled.

[0044] Please refer to Figure 2 As shown, in the first state, the left template 1 and the right template 2 are respectively located on both sides of the bottom longitudinal beam template 6, and the lower end surfaces of the left template 1 and the right template 2 and the lower end surface of the bottom longitudinal beam template 6 are located on the same horizontal plane.

[0045] Please refer to Figure 4 As shown, in the second state, at least a part of the bottom longitudinal beam template 6 is located in the enclosed space formed by the left template 1 and the right template 2.

[0046] Specifically, please refer to Figure 2 - Figure 3 As shown, mounting seats are provided on the left template 1, the right template 2, and the bottom longitudinal beam template 6, and the mounting seats are connected to the assembly 8. The assembly 8 includes a link group, and the link group includes a second link 82, a third link 83, and two first links 81.

[0047] Wherein, one ends of the two first links 81 are hinged to each other and hinged to the left template 1, and one first link 81 is in an upward rotation state, and the other first link 81 is in a downward rotation state. One end of the second link 82 is hinged to the bottom longitudinal beam template 6, and the other end is hinged to the upward rotation end of the upward rotation first link 81, and the second link 82 is arranged in parallel with the downward rotation first link 81. One end of the third link 83 is hinged to the bottom longitudinal beam template 6, and the other end is hinged to the left template 1, and the third link 83 is arranged in parallel with the upward rotation first link 81. The lengths of the multiple links are different. In this embodiment, they are hinged and combined by pins to form multiple congruent parallelogram structures. The link group of multiple congruent parallelogram structures can realize the two-way motion conversion under single-degree-of-freedom control.

[0048] Two connecting rod groups are provided, and the two connecting rod groups are symmetrically arranged along the central axis of the bottom longitudinal beam formwork 6. The second connecting rods 82 in the two connecting rod groups are hinged to each other at the ends located on the central axis and are hinged to the bottom longitudinal beam formwork 6. The third connecting rods 83 in the two connecting rod groups are hinged to each other at the ends located on the central axis and are hinged to the bottom longitudinal beam formwork 6.

[0049] Furthermore, the first connecting rod 81, the second connecting rod 82, and the third connecting rod 83 are hinged in such a way that when the angle between any two connecting rods changes, the angles between the other connecting rods will also change. The horizontal opening and closing of the left template 1 and the right template 2 can drive the bottom longitudinal beam formwork 6 to rise and fall through the cooperation of multiple connecting rods.

[0050] Among them, the mounting seats are arranged at three places. The first mounting seat 3 is located inside the left template 1, the second mounting seat 4 is located inside the right template 2, and the third mounting seat 7 is arranged at the top of the bottom longitudinal beam formwork 6. The first mounting seat 3, the second mounting seat 4, and the third mounting seat 7 are all provided with chutes 8 for restricting the movement trajectory of the combination member, namely the first chute 31, the second chute 41, and the third chute 71 respectively.

[0051] The first mounting seat 3 is connected to two first connecting rods 81. The hinge point of the two first connecting rods 81 at the first mounting seat 3 is the first sliding hinge point 84, and the hinge point of the first mounting seat 3 and one third connecting rod 83 is the first fixed hinge point 87. The first mounting seat 3 is also provided with a first chute 31, and the first chute 31 is a vertically strip-shaped groove. In the connecting rod group connected to the left template 1, when the angle between the downwardly rotating first connecting rod 81 and the third connecting rod 83 changes, the first connecting rod 81 rotates around the first sliding hinge point 84, and the third connecting rod 83 rotates around the first fixed hinge point 87. At this time, the first sliding hinge point 84 slides up and down in the first chute 31.

[0052] Correspondingly, the second mounting seat 4 is also connected to two first connecting rods 81. The hinge point of the two first connecting rods 81 at the second mounting seat 4 is the second sliding hinge point 86, and the hinge point of the second mounting seat 4 and one third connecting rod 83 is the second fixed hinge point 89. The second mounting seat 4 is provided with a second chute 41. The second mounting seat 4 has the same structure as the first mounting seat 3, so the second chute 41 is also a vertically strip-shaped groove. In the connecting rod group connected to the right template 2, when the angle between the downwardly rotating first connecting rod 81 and the third connecting rod 83 changes, the first connecting rod 81 rotates around the second sliding hinge point 86, and the third connecting rod 83 rotates around the second fixed hinge point 89. At this time, the second sliding hinge point 86 slides up and down in the second chute 41.

[0053] For the third mounting base 7, the hinge points of the two second connecting rods 82 at the third mounting base 7 are the third sliding hinge points 85, and the hinge points of the third mounting base 7 and the two third connecting rods 83 are the third fixed hinge points 88. The third mounting base 7 is provided with a third chute 71, and the third chute 71 is a vertically strip-shaped groove. In any link group, when the angle between the second connecting rod 82 and the third connecting rod 83 changes, the third connecting rod 83 rotates around the third fixed hinge point 88, and the second connecting rod 82 rotates around the third sliding hinge point 85. At this time, the third sliding hinge point 85 slides up and down in the third chute 71.

[0054] In this embodiment, based on the horizontal opening and closing state of the left template 1 and the right template 2, the assembly 8 can be telescoped in the horizontal direction to adjust the position of the bottom longitudinal beam template 6.

[0055] Specifically, please refer to Figure 2 - Figure 3 As shown, the state where the left template 1 and the right template 2 are horizontally unfolded is taken as the first state. At this time, the left template 1 and the right template 2 are horizontally separated under the action of the oil cylinder 5, and the assembly 8 is in tension. The first mounting base 3 and the second mounting base 4 are horizontally separated, driving the first fixed hinge point 87 and the second fixed hinge point 89 to be horizontally separated. At this time, the angle between the two third connecting rods 83 increases, and the third fixed hinge point 88 moves downward, driving the third mounting base 7 and the bottom longitudinal beam template 6 to move downward, so that the bottom longitudinal beam template 6 is opened between the left template 1 and the right template 2.

[0056] Please refer to Figure 4 As shown, the state where the left template 1 and the right template 2 are horizontally closed is taken as the second state. At this time, the left template 1 and the right template 2 move horizontally towards each other under the action of the oil cylinder 5, and the assembly 8 is squeezed. The first mounting base 3 and the second mounting base 4 approach each other, driving the first fixed hinge point 87 and the second fixed hinge point 89 to approach each other. At this time, the angle between the two third connecting rods 83 decreases, and the third fixed hinge point 88 moves upward, driving the third mounting base 7 and the bottom longitudinal beam template 6 to move upward, so that the bottom longitudinal beam template 6 is wrapped between the left template 1 and the right template 2.

[0057] The inventor found that traditional internal molds for highway box girders mostly adopt a scattered block combination mode, with slow installation. Generally, bolt connections are used between various parts, and they are completely installed and removed manually one by one. When demolding, operators also need to enter the box chamber to operate, resulting in a relatively high labor intensity for operators and a high safety risk. Currently, some box girders with larger internal cavity sizes, such as railway box girders, have started to arrange hydraulic systems to gradually realize hydraulic automatic formwork erection and removal. However, for some small highway box girders with small sizes, especially the internal cavities of highway box girders with a small height-width ratio, although their transverse dimensions are large, their heights are low, resulting in limited space for formwork erection and removal, and it is very difficult to arrange a hydraulic system to achieve automatic operation.

[0058] In the present invention, the horizontal movement of the left template 1 and the right template 2 is converted into the vertical lifting of the bottom longitudinal beam template 6 through the telescoping of the assembly 8, that is, the linkage between multiple connecting rods, so as to realize the synchronous closing and unfolding of the inner mold, and then present the first state or the second state, thereby realizing the automatic receiving and discharging of the inner mold of the precast highway box girder, without manual intervention, saving time, reducing the labor intensity of the operators, and improving the receiving and discharging mold efficiency and the service life of the mold.

[0059] It should be noted that in precast highway box girders, there are some inner molds of precast small highway box girders with a small inner cavity height-width ratio. In this case, the space for receiving and discharging the mold is greatly restricted. Not only is manual operation restricted, but also the hydraulic system that replaces manual operation is difficult to be arranged in the inner mold. Because the installation position and length of the hydraulic system (the hydraulic system usually realizes the receiving and discharging of the inner mold through the oil cylinder 5) generally require a large space. Especially under the restricted height, it is very difficult for the hydraulic system to be arranged in a suitable position. Even if it can be arranged, its movement stroke will be restricted and it is difficult to achieve the required working effect. Moreover, the hydraulic system requires stable force transmission and precise control during operation. In the inner cavity environment with a narrow space and a low height, the oil circuit design and layout of the hydraulic system will be more complex. And the hydraulic system needs to ensure the smooth flow of oil and the accuracy of control. The narrow space will cause difficulties in pipeline design, which will affect the uniformity of oil flow and control accuracy, and thus affect the overall effect of the receiving and discharging mold operation. The assembly 8 adopted in this application realizes the two-way movement conversion under single-degree-of-freedom control through the linkage of multiple connecting rods in the connecting rod group, and solves the problem of difficult automatic receiving and discharging of the inner mold of the precast highway box girder with a small inner cavity height-width ratio. And the assembly 8 is a modular design and can adapt to the inner cavities of box girders with different height-width ratios.

[0060] It can be understood that the first sliding hinge point 84, the second sliding hinge point 86, and the third sliding hinge point 85 are respectively matched with the corresponding sliding grooves, so as to restrict the movement of the template along the designed direction, making the receiving and discharging of the mold smoother.

[0061] Please refer to Figure 5 As shown in the figure, in another embodiment, a method for receiving and discharging the inner mold of a box girder uses the receiving and discharging mechanism of the inner mold of the box girder to receive the mold. The method for receiving and discharging the inner mold of the box girder includes:

[0062] Please refer to Figure 2 - Figure 3 As shown in the figure, in the first state, the left template 1 and the right template 2 are driven to move horizontally away from each other. The assembly 8 is horizontally stretched, the included angle between the two third connecting rods 83 increases, the third fixed hinge point 88 moves downward, and drives the bottom longitudinal beam template 6 to move downward through the third mounting seat 7 until the lower end surfaces of the left template 1, the right template 2, and the bottom longitudinal beam template 6 are on the same horizontal plane, and the formwork support is completed.

[0063] Please refer toFigure 4 As shown (in order to facilitate the observation of the mold closing state of the inner mold, the oil cylinder 5 and the three mounting seats are omitted in the Figure 4 drawing, and they all exist in actual applications). In the second state, the left template 1 and the right template 2 are driven to move horizontally towards each other, and the assembly 8 is horizontally squeezed. The angle between the two third connecting rods 83 decreases, and the third fixed hinge point 88 moves upward, driving the bottom longitudinal beam template 6 to move upward through the third mounting seat 7 until the bottom longitudinal beam template is completely located within the enclosed space formed by the left template 1 and the right template 2, and the mold closing is completed.

[0064] It can be understood that when the bottom longitudinal beam template 6 moves, based on the limitation of the third sliding hinge point 85 by the third chute 71, the third sliding hinge point 85 slides within the third chute 71, keeping the moving direction of the bottom longitudinal beam template 6 vertical.

[0065] The specific operation is as follows:

[0066] S1. Determine whether the inner mold needs to perform the formwork support action or the mold closing action.

[0067] If formwork support is required, go to S2.

[0068] If mold closing is required, go to S3.

[0069] S2. When performing formwork support, the left template 1 and the right template 2 are driven to move horizontally away from each other by the oil cylinder 5, and the assembly 8 is horizontally stretched.

[0070] Specifically, the first mounting seat 3 and the second mounting seat 4 move horizontally away from each other, driving the first fixed hinge point 87 and the second fixed hinge point 89 to move horizontally away from each other. At this time, the angle between the two third connecting rods 83 increases, the third fixed hinge point 88 moves downward, driving the third mounting seat 7 and the bottom longitudinal beam template 6 to move downward, so that the bottom longitudinal beam template 6 is opened between the left template 1 and the right template 2, and the formwork support is completed.

[0071] S3. When performing mold closing, the left template 1 and the right template 2 are driven to move horizontally towards each other by the oil cylinder 5, and the assembly 8 is horizontally squeezed.

[0072] Specifically, the first mounting seat 3 and the second mounting seat 4 approach each other, driving the first fixed hinge point 87 and the second fixed hinge point 89 to approach each other. At this time, the angle between the two third connecting rods 83 decreases, the third fixed hinge point 88 moves upward, driving the third mounting seat 7 and the bottom longitudinal beam template 6 to move upward, so that the bottom longitudinal beam template 6 is wrapped between the left template 1 and the right template 2, and the mold closing is completed.

[0073] Working principle: The horizontal movement of the left template 1 and the right template 2 is converted into the vertical lifting of the bottom longitudinal beam template 6 through the linkage between multiple connecting rods in the assembly 8, enabling the synchronous closing and unfolding of the inner mold, and thus realizing the automatic retraction and extension of the inner mold of the precast highway box girder.

[0074] The above has described a specific embodiment of the present invention in detail, but the described content is only the preferred embodiment of the present invention and cannot be considered as defining the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the present invention application should still fall within the scope covered by the claims of the present invention.

Claims

1. A receiving and discharging mechanism for an inner formwork of a box girder, comprising: Inner mold, the inner mold includes: a left template (1), a right template (2) and a bottom longitudinal beam template (6), characterized in that it further includes: a combination member (8), the combination member (8) is hinged to the inner mold; A driving device, the driving device is used to drive the combination member (8) to expand and contract, so that the inner mold can achieve at least two states; In the first state, the left template (1) and the right template (2) are respectively located on both sides of the bottom longitudinal beam template (6), and the lower end surfaces of the left template (1) and the right template (2) and the lower end surface of the bottom longitudinal beam template (6) are located on the same horizontal plane; In the second state, at least a part of the bottom longitudinal beam template (6) is located in the enclosed space formed by the left template (1) and the right template (2); The combination member (8) includes a connecting rod group, the connecting rod group includes a second connecting rod (82), a third connecting rod (83) and two first connecting rods (81), a third mounting seat (7) is arranged at the top of the bottom longitudinal beam template (6), the hinge point of the second connecting rod (82) at the third mounting seat (7) is the third sliding hinge point (85), the hinge point of the third mounting seat (7) and the third connecting rod (83) is the third fixed hinge point (88), the third mounting seat (7) is provided with a third chute (71), in any one connecting rod group, when the included angle between the second connecting rod (82) and the third connecting rod (83) changes, the third sliding hinge point (85) slides up and down in the third chute (71); In the first state, driving the left template (1) and the right template (2) to move horizontally away from each other, the included angle between the two third connecting rods (83) in the combination member (8) increases, the third fixed hinge point (88) moves down, and the bottom longitudinal beam template (6) moves down until the lower end surfaces of the left template (1), the right template (2) and the lower end surface of the bottom longitudinal beam template (6) are located on the same horizontal plane, and the formwork support is completed; In the second state, driving the left template (1) and the right template (2) to move horizontally towards each other, the included angle between the two third connecting rods (83) in the combination member (8) decreases, the third fixed hinge point (88) moves up, and the bottom longitudinal beam template (6) moves up until the bottom longitudinal beam template is completely located in the enclosed space formed by the left template (1) and the right template (2), and the formwork removal is completed; When the bottom longitudinal beam template (6) moves, based on the limitation of the third sliding hinge point (85) by the third chute (71), the third sliding hinge point (85) slides in the third chute (71), so that the movement direction of the bottom longitudinal beam template (6) remains vertical.

2. The income and expenditure mechanism of the box girder internal form according to claim 1, characterized in that, Wherein, One ends of the two first connecting rods (81) are hinged to each other and hinged to the left template (1), and one of the first connecting rods (81) is in an upward rotation state, and the other first connecting rod (81) is in a downward rotation state; One end of the second connecting rod (82) is hinged to the bottom longitudinal beam formwork (6), and the other end is hinged to the upwardly rotating end of the first connecting rod (81), and the second connecting rod (82) is arranged in parallel with the downwardly rotating first connecting rod (81); One end of the third connecting rod (83) is hinged to the bottom longitudinal beam formwork (6), and the other end is hinged to the left side formwork (1), and the third connecting rod (83) is arranged in parallel with the upwardly rotating first connecting rod (81).

3. The income and expenditure mechanism of a box girder internal form according to claim 2, characterized in that, The downwardly rotating first connecting rod (81) and the second connecting rod (82) are both hinged to the third connecting rod (83) while maintaining a parallel state.

4. The income and expenditure mechanism of a box girder internal form according to claim 2, characterized in that Two connecting rod groups are provided, and the two connecting rod groups are symmetrically arranged along the central axis of the bottom longitudinal beam formwork (6); Among them, the second connecting rods (82) in the two connecting rod groups are hinged to each other at the ends located at the central axis and are hinged to the bottom longitudinal beam formwork (6); The third connecting rods (83) in the two connecting rod groups are hinged to each other at the ends located at the central axis and are hinged to the bottom longitudinal beam formwork (6).

5. The income and expenditure mechanism of an inner formwork for box girders according to claim 4, characterized in that, A first mounting seat (3) is arranged inside the left side formwork (1). The hinge point of the first connecting rod (81) at the first mounting seat (3) is the first sliding hinge point (84), and the hinge point of the first mounting seat (3) and the third connecting rod (83) is the first fixed hinge point (87).

6. The income and expenditure mechanism of a box girder internal form according to claim 4, characterized in that A second mounting seat (4) is arranged inside the right side formwork (2). The hinge point of the first connecting rod (81) at the second mounting seat (4) is the second sliding hinge point (86), and the hinge point of the second mounting seat (4) and the third connecting rod (83) is the second fixed hinge point (89).

7. The income and expenditure mechanism of a box girder internal form according to claim 5, characterized in that, The first mounting seat (3) is provided with a first chute (31). When the angle between the downwardly rotating first connecting rod (81) and the third connecting rod (83) changes in the connecting rod group connected to the left side formwork (1), the first sliding hinge point (84) slides up and down in the first chute (31).

8. The income and expenditure mechanism of a box girder internal form according to claim 6, characterized in that, The second mounting seat (4) is provided with a second chute (41). When the angle between the downwardly rotating first connecting rod (81) and the third connecting rod (83) changes in the connecting rod group connected to the right side formwork (2), the second sliding hinge point (86) slides up and down in the second chute (41).

9. The income and expenditure mechanism of an inner formwork for box girders according to claim 1, characterized in that, The driving device is an oil cylinder (5). The oil cylinder (5) is arranged between the left side formwork (1) and the right side formwork (2), and the oil cylinder (5) can drive the left side formwork (1) and the right side formwork (2) to perform horizontal opening and closing movements.

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