Folding and supporting mechanism and folding and supporting method for box girder internal mold

Abstract

The invention discloses a folding and unfolding mechanism and a folding and unfolding method for a box girder inner formwork, the folding and unfolding mechanism for the box girder inner formwork comprises an inner formwork, the inner formwork comprises a left side formwork, a right side formwork and a bottom longitudinal beam formwork, and the folding and unfolding mechanism further comprises an assembly hinged to the inner formwork; in the first state, the left side formwork and the right side formwork are located on the two sides of the bottom longitudinal beam formwork respectively, and the lower end face of the left side formwork, the lower end face of the right side formwork and the lower end face of the bottom longitudinal beam formwork are located on the same horizontal plane. And in the second state, at least part of the bottom longitudinal beam formwork is located in an enclosed space formed by the left side formwork and the right side formwork. According to the folding and unfolding mechanism of the box girder inner mold, horizontal movement of the left side mold plate and the right side mold plate is converted into vertical lifting of the bottom longitudinal beam mold plate through stretching and retracting of the assembly, synchronous folding and unfolding of the inner mold can be achieved, and automatic folding and unfolding of the prefabricated highway box girder inner mold are achieved; the problem that automatic folding and unfolding of the prefabricated highway box girder inner mold with the small inner cavity height-width ratio are difficult is solved.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated highway box girder construction, and in particular to a retracting and extending mechanism and a retracting and extending method of an inner mold of a box girder. Background Art

[0002] Box girder is a type of beam in bridge engineering. It is hollow inside and has flanges on both sides of the upper part, similar to a box. Box girders of reinforced concrete structures are divided into precast box girders and cast-in-place box girders. Box girders prefabricated in an independent site can be erected in combination with a bridge-erecting machine after the lower project is completed, which can speed up the progress of the project and save construction time. Cast-in-place box girders are mostly used for large continuous bridges. Precast highway box girders are a structural component widely used in highway bridge construction. They are a type of precast concrete beam and are usually made of prestressed concrete or ordinary concrete. Precast box girders have high strength and good durability. Because they are prefabricated in factories, they have a short construction period and controllable quality. They are widely used in the construction of medium and large span bridges.

[0003] In highway bridge construction, the application of prefabricated highway box girders is becoming more and more common. The structure of prefabricated highway box girders is also constantly changing with the development of technology. Traditional highway box girder inner molds mostly adopt scattered block combination mode, which is slow to install, and the parts are generally connected by bolts. They are completely installed and removed manually one by one. When demolding, operators are also required to enter the box room to operate, which has high labor intensity and safety risks. At present, some box girders with larger inner cavity sizes, such as railway box girders, have begun to arrange hydraulic systems and gradually realize hydraulic automatic expansion and contraction molds. However, for some smaller highway box girders, due to the small internal space, especially the inner cavity of highway box girders with small aspect ratios, the lateral size is large, but the height is low, resulting in limited expansion and contraction mold space, and it is difficult to arrange hydraulic systems 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 realize automatic expansion and contraction of the mold for the inner cavity of a small highway box girder with a small aspect ratio, and to propose an expansion and contraction mechanism and method for the inner mold of the box girder.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A box girder inner mold retracting and extending mechanism, comprising: an inner mold, the inner mold comprising: a left mold, a right mold and a bottom longitudinal beam mold, and also comprising: an assembly, the assembly being hinged to the inner mold; A driving device, the driving device is used to drive the assembly to extend and retract, so that the inner mold can achieve at least two states; 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 surface of the left template, the lower end surface of the right template and the lower end surface of the bottom longitudinal beam template are located in the same horizontal plane; In the second state, the bottom longitudinal beam template is at least partially located in the enclosed space formed by the left template and the right template.

[0006] As a further solution of the present invention: the assembly includes a connecting rod group, and the connecting rod group includes a second connecting rod, a third connecting rod and two first connecting rods; Wherein, one ends of the two first connecting rods are hinged to each other and to the left template, and one of the first connecting rods is in an upward rotation state, and the other first connecting rod is in a downward rotation state; One end of the second connecting rod is hinged to the bottom longitudinal beam template, and the other end is hinged to the upward rotating end of the first connecting rod that rotates upward, and the second connecting rod is arranged in parallel with the first connecting rod that rotates downward; One end of the third connecting rod is hinged to the bottom longitudinal beam template, and the other end is hinged to the left template, and the third connecting rod is arranged parallel to the upward-rotating first connecting rod.

[0007] As a further solution of the present invention: the first connecting rod and the second connecting rod that rotate downward are both hinged to the third connecting rod while maintaining parallelism.

[0008] As a further solution of the present invention: two connecting rod groups are provided, and the two connecting rod groups are symmetrically arranged along the central axis of the bottom longitudinal beam template; Wherein, the second connecting rods in the two groups of connecting rod groups are hinged to each other at the ends located at the central axis, and are hinged to the bottom longitudinal beam template; The third links in the two groups of link assemblies are hinged to each other at the ends located at the central axis and are hinged to the bottom longitudinal beam template.

[0009] As a further solution of the present invention: a first mounting seat is arranged on the inner side of the left side template, the hinge point of the first connecting rod at the first mounting seat is a first sliding hinge point, and the hinge point between the first mounting seat and the third connecting rod is a first fixed hinge point.

[0010] As a further solution of the present invention: a second mounting seat is arranged on the inner side of the right side template, the hinge point of the first connecting rod at the second mounting seat is a second sliding hinge point, and the hinge point between the second mounting seat and the third connecting rod is a second fixed hinge point.

[0011] As a further solution of the present invention: a third mounting seat is arranged on the top of the bottom longitudinal beam template, the hinge point of the second connecting rod at the third mounting seat is a third sliding hinge point, and the hinge point between the third mounting seat and the third connecting rod is a third fixed hinge point.

[0012] As a further solution of the present invention: the first mounting seat is provided with a first sliding groove, and in the connecting rod group connected to the left template, when the angle between the first connecting rod and the third connecting rod that rotates downward changes, the first sliding hinge point slides up and down in the first sliding groove.

[0013] As a further solution of the present invention: the second mounting seat is provided with a second sliding groove, and in the connecting rod group connected to the right template, when the angle between the first connecting rod and the third connecting rod that rotates downward changes, the second sliding hinge point slides up and down in the second sliding groove.

[0014] As a further solution of the present invention: the third mounting seat is provided with a third sliding groove, and in any connecting rod group, when the angle between the second connecting rod and the third connecting rod changes, the third sliding hinge point slides up and down in the third sliding groove.

[0015] As a further solution of the present invention: the driving device is a cylinder, and the cylinder is arranged between the left template and the right template. The cylinder can drive the left template and the right template to perform horizontal opening and closing movements.

[0016] A box girder inner mold closing and expansion method uses a box girder inner mold closing and expansion mechanism to close the mold, comprising: In the first state, the left template and the right template are driven to move horizontally apart, the angle between the two third connecting rods in the assembly increases, the third fixed hinge point moves downward, and the bottom longitudinal beam template moves downward until the lower end surface of the left template, the lower end surface of the right template and the lower end surface of the bottom longitudinal beam template are located at the same horizontal plane, and the formwork is completed; In the second state, the left template and the right template are driven to move horizontally toward each other, the angle between the two third connecting rods in the assembly decreases, the third fixed hinge point moves upward, and the bottom longitudinal beam template moves upward until the bottom longitudinal beam template is completely located in the enclosed space formed by the left template and the right template, and the mold closing is completed.

[0017] As a further solution of the present invention: when the bottom longitudinal beam template moves, based on the limitation of the third sliding hinge point by the third sliding groove, the third sliding hinge point slides in the third sliding groove, so that the movement direction of the bottom longitudinal beam template remains vertical.

[0018] Beneficial effects of the present invention: (1) In the present invention, the horizontal movement of the left and right templates is converted into the vertical lifting of the bottom longitudinal beam template through the extension and retraction of the assembly, which can realize the synchronous closing and unfolding of the inner mold, and then present the first state or the second state, thereby realizing the automatic retraction and expansion of the inner mold of the prefabricated highway box girder without manual intervention, saving time, reducing the labor intensity of operators, and improving the efficiency of retraction and expansion of the mold and the service life of the template.

[0019] (2) In the present invention, the assembly is linked by multiple connecting rods in the connecting rod group to achieve bidirectional motion conversion under single degree of freedom control in a limited inner mold space, thereby solving the problem of difficulty in automatic expansion and contraction of the inner mold of a prefabricated highway box girder with a small aspect ratio of the inner cavity.

[0020] (3) In the present invention, the three sliding hinge points cooperate with the corresponding sliding grooves respectively, thereby constraining the template to move along the designed direction, so that the expansion and contraction of the mold can be more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figure 1 It is a structural schematic diagram of the income and expenditure mechanism of the box beam inner mold of the present invention; Figure 2 It is a structural schematic diagram of the inlet and outlet mechanism of the box beam inner mold of the present invention in the first state; Figure 3 It is a structural schematic diagram of the inlet and outlet mechanism of the box beam inner mold of the present invention in the first state; Figure 4 It is a structural schematic diagram of the inlet and outlet mechanism of the box beam inner mold of the present invention in the second state; Figure 5 It is a schematic flow chart of the method for collecting and paying out the inner mold of a box beam of the present invention.

[0023] In the figure: 1. Left side template; 2. Right side template; 3. First mounting seat; 31. First slide groove; 4. Second mounting seat; 41. Second slide groove; 5. Cylinder; 6. Bottom longitudinal beam template; 7. Third mounting seat; 71. Third slide groove; 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 DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1 As shown, the present invention is a box girder inner mold retracting and extending mechanism, comprising an inner mold, the inner mold comprising: a left mold 1, a right mold 2 and a bottom longitudinal beam mold 6. It also comprises: an assembly 8, the assembly 8 is hinged to the inner mold.

[0026] 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 extend and retract, so that the inner mold can achieve at least two states. The driving device includes but is not limited to a cylinder, a gas cylinder, and a propeller. Preferably, a cylinder 5 is used, and the 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.

[0027] See also Figure 2 As shown, in the first state, the left side formwork 1 and the right side formwork 2 are respectively located on both sides of the bottom longitudinal beam formwork 6, and the lower end surfaces of the left side formwork 1 and the right side formwork 2 are located in the same horizontal plane as the lower end surface of the bottom longitudinal beam formwork 6.

[0028] See also Figure 4 As shown, in the second state, the bottom longitudinal beam template 6 is at least partially located in the enclosed space formed by the left template 1 and the right template 2.

[0029] For details, please refer to Figure 2-Figure 3 As shown, the left side formwork 1, the right side formwork 2 and the bottom longitudinal beam formwork 6 are all provided with mounting seats, and the mounting seats are connected to the assembly 8. The assembly 8 includes a connecting rod group, and the connecting rod group includes a second connecting rod 82, a third connecting rod 83 and two first connecting rods 81.

[0030] Among them, one end of the two first connecting rods 81 is hinged to each other and hinged to the left template 1, and one first connecting rod 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 template 6, and the other end is hinged to the upward rotation end of the first connecting rod 81 that rotates upward, and the second connecting rod 82 is arranged in parallel with the downward rotating first connecting rod 81. One end of the third connecting rod 83 is hinged to the bottom longitudinal beam template 6, and the other end is hinged to the left template 1, and the third connecting rod 83 is arranged in parallel with the first connecting rod 81 that rotates upward. Multiple connecting rods have different lengths. In this embodiment, they are hinged and combined by pins to form multiple congruent parallelogram structures. A connecting rod group with multiple congruent parallelogram structures can realize bidirectional motion conversion under single degree of freedom control.

[0031] Two connecting rod groups are provided, and the two connecting rod groups are symmetrically arranged along the central axis of the bottom longitudinal beam template 6. 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 template 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 template 6.

[0032] Furthermore, the first connecting rod 81, the second connecting rod 82, and the third connecting rod 83 are hinged so that when the angles of any two connecting rods change, the angles between the other connecting rods will change. The left template 1 and the right template 2 can be opened and closed horizontally by driving the bottom longitudinal beam template 6 to rise and fall through multiple connecting rods.

[0033] Among them, the mounting seats are arranged at three places, the first mounting seat 3 is located in the left template 1, the second mounting seat 4 is located in the right template 2, and the third mounting seat 7 is arranged on the top of the bottom longitudinal beam template 6. The first mounting seat 3, the second mounting seat 4, and the third mounting seat 7 are all provided with slide grooves for constraining the movement trajectory of the assembly 8, which are the first slide groove 31, the second slide groove 41, and the third slide groove 71 respectively.

[0034] The first mounting seat 3 is connected to two first connecting rods 81, and the hinge point of the two first connecting rods 81 at the first mounting seat 3 is a first sliding hinge point 84, and the hinge point between the first mounting seat 3 and a third connecting rod 83 is a first fixed hinge point 87. The first mounting seat 3 also has a first slide groove 31, and the first slide groove 31 is a vertical strip-shaped groove body. In the connecting rod group connected to the left template 1, when the angle between the downward 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 slide groove 31.

[0035] Correspondingly, the second mounting seat 4 is also connected to two first connecting rods 81, and 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 between the second mounting seat 4 and a third connecting rod 83 is the second fixed hinge point 89. The second mounting seat 4 is provided with a second slide groove 41, and the second mounting seat 4 has the same structure as the first mounting seat 3, so the second slide groove 41 is also a vertical strip-shaped groove body. 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 which time, the second sliding hinge point 86 slides up and down in the second slide groove 41.

[0036] For the third mounting seat 7, the hinge point of the two second connecting rods 82 at the third mounting seat 7 is the third sliding hinge point 85, and the hinge point between the third mounting seat 7 and the two third connecting rods 83 is the third fixed hinge point 88. The third mounting seat 7 is provided with a third slide groove 71, and the third slide groove 71 is a vertical strip-shaped groove body. In any connecting rod 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 slide groove 71.

[0037] In this embodiment, based on the horizontal opening and closing state of the left side formwork 1 and the right side formwork 2 , the assembly 8 can be extended and retracted in the horizontal direction to adjust the position of the bottom longitudinal beam formwork 6 .

[0038] Specifically, see 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 pulled. The first mounting seat 3 and the second mounting seat 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 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.

[0039] See also Figure 4 As shown, the state where the left template 1 and the right template 2 are horizontally closed is the second state. At this time, the left template 1 and the right template 2 move horizontally toward each other under the action of the cylinder 5, and the assembly 8 is squeezed. The first mounting seat 3 and the second mounting seat 4 are close to each other, driving the first fixed hinge point 87 and the second fixed hinge point 89 to move closer to each other. At this time, the angle between the two third connecting rods 83 decreases, and the third fixed hinge point 88 moves up, driving the third mounting seat 7 and the bottom longitudinal beam template 6 to move up, so that the bottom longitudinal beam template 6 is wrapped between the left template 1 and the right template 2.

[0040] The inventors found that the traditional inner molds of highway box girders are mostly in a scattered block combination mode, which is slow to install, and the parts are generally connected by bolts. They are completely installed and removed manually one by one. When demolding, operators are also required to enter the box room to operate, which has a high labor intensity and high safety risks. At present, some box girders with larger inner cavity sizes, such as railway box girders, have begun to arrange hydraulic systems to gradually realize hydraulic automatic expansion and contraction molds. However, for some smaller highway box girders, due to the small internal space, especially the inner cavity of highway box girders with a small aspect ratio, the lateral size is large, but the height is low, resulting in limited expansion and contraction mold space, and it is difficult to arrange hydraulic systems to achieve automatic operation.

[0041] In the present invention, the horizontal movement of the left side formwork 1 and the right side formwork 2 is converted into the vertical lifting of the bottom longitudinal beam formwork 6 through the extension and retraction of the assembly 8, that is, the linkage between multiple connecting rods, which can realize the synchronous closing and unfolding of the inner mold, and then present the first state or the second state, thereby realizing the automatic expansion and contraction of the inner mold of the prefabricated highway box girder without manual intervention, saving time, reducing the labor intensity of operators, and improving the efficiency of the expansion and contraction of the mold and the service life of the mold.

[0042] It should be noted that among the prefabricated highway box girders, there are some prefabricated highway small box girder inner molds with small inner cavity height-to-width ratios. In this case, the space for the inlet and outlet molds is greatly limited, not only is manual operation limited, but the hydraulic system that replaces manual operation is also difficult to arrange in the inner mold. Because the installation position and length of the hydraulic system (the hydraulic system usually uses the oil cylinder 5 to achieve the inlet and outlet of the inner mold) usually require a large space, especially under a limited height, it is difficult to arrange the hydraulic system in a suitable position. Even if it can be arranged, its movement stroke will be limited, and it is difficult to achieve the desired working effect. Moreover, the hydraulic system requires stable force transmission and precise control during operation. In a small space and low-height inner cavity environment, the oil circuit design and layout of the hydraulic system will be more complicated, and the hydraulic system needs to ensure smooth oil flow and precise control. The narrow space will make the pipeline design difficult, which will in turn affect the uniformity and control accuracy of the oil flow, thereby affecting the overall effect of the inlet and outlet mold operation. The assembly 8 used in the present application realizes bidirectional motion conversion under single degree of freedom control in a limited inner mold space through the linkage of multiple connecting rods in the connecting rod group, thereby solving the problem of difficulty in automatic expansion and contraction of the inner mold of the prefabricated highway box beam with a small inner cavity height-width ratio. Moreover, the assembly 8 is a modular design that can adapt to the inner cavity of the box beam with different height-width ratios.

[0043] It can be understood that the first sliding hinge point 84, the second sliding hinge point 86, and the third sliding hinge point 85 cooperate with the corresponding sliding grooves respectively, thereby constraining the template to move along the designed direction, so that the expansion and contraction of the mold can be more stable.

[0044] See also Figure 5 As shown, in another embodiment, a box girder inner mold expansion and contraction method uses an expansion and contraction mechanism of the box girder inner mold to close the mold. The box girder inner mold expansion and contraction method includes: See also Figure 2-Figure 3 As shown, in the first state, the left side formwork 1 and the right side formwork 2 are driven to move horizontally apart, the assembly 8 is stretched horizontally, the angle between the two third connecting rods 83 increases, the third fixed hinge point 88 moves downward, and the bottom longitudinal beam formwork 6 is driven to move downward through the third mounting seat 7 until the lower end surface of the left side formwork 1, the lower end surface of the right side formwork 2 and the lower end surface of the bottom longitudinal beam formwork 6 are located in the same horizontal plane, and the formwork is completed.

[0045] See also Figure 4 As shown (In order to facilitate the observation of the mold closing state of the inner mold, Figure 4The cylinder 5 and three mounting seats are omitted in the drawing, which are present in actual applications). In the second state, the left side template 1 and the right side template 2 are driven to move horizontally toward each other, the assembly 8 is horizontally squeezed, the angle between the two third connecting rods 83 is reduced, the third fixed hinge point 88 moves upward, and the bottom longitudinal beam template 6 is driven to move upward through the third mounting seat 7 until the bottom longitudinal beam template is completely located in the enclosed space formed by the left side template 1 and the right side template 2, and the mold closing is completed.

[0046] It is understandable that when the bottom longitudinal beam template 6 moves, based on the limitation of the third sliding hinge point 85 by the third sliding groove 71, the third sliding hinge point 85 slides in the third sliding groove 71, so that the movement direction of the bottom longitudinal beam template 6 remains vertical.

[0047] The specific operations are as follows: S1. Determine whether the inner mold needs to perform a mold support action or a mold retraction action.

[0048] Formwork is required, enter S2.

[0049] The mold needs to be closed and enter S3.

[0050] S2. During formwork support, the left side formwork 1 and the right side formwork 2 are driven to move horizontally apart by the oil cylinder 5, and the assembly 8 is stretched horizontally.

[0051] Specifically, the first mounting seat 3 and the second mounting seat 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 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 is completed.

[0052] S3. When closing the mold, the left mold plate 1 and the right mold plate 2 are driven by the oil cylinder 5 to move horizontally toward each other, and the assembly 8 is squeezed horizontally.

[0053] Specifically, the first mounting seat 3 and the second mounting seat 4 are close to 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 is reduced, and the third fixed hinge point 88 moves up, driving the third mounting seat 7 and the bottom longitudinal beam template 6 to move up, 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.

[0054] 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, which can realize the synchronous closing and unfolding of the inner mold, thereby realizing the automatic retraction and expansion of the inner mold of the prefabricated highway box girder.

[0055] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A box girder inner mold inlet and outlet mechanism, comprising: An inner mold, the inner mold comprising: a left mold plate (1), a right mold plate (2) and a bottom longitudinal beam mold plate (6), characterized in that it also comprises: an assembly (8), the assembly (8) being hinged to the inner mold; A driving device, the driving device is used to drive the assembly (8) to extend and retract, so that the inner mold can achieve at least two states; In a first state, the left side template (1) and the right side template (2) are respectively located on both sides of the bottom longitudinal beam template (6), and the lower end surface of the left side template (1), the lower end surface of the right side 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, the bottom longitudinal beam template (6) is at least partially located in the enclosed space formed by the left template (1) and the right template (2).

2. The inlet and outlet mechanism of the box beam inner mold according to claim 1 is characterized in that: The assembly (8) comprises a connecting rod assembly, wherein the connecting rod assembly comprises a second connecting rod (82), a third connecting rod (83) and two first connecting rods (81); Wherein, one ends of the two first connecting rods (81) are hinged to each other and to the left template (1), and one of the first connecting rods (81) is in an upward rotation state, and the other of the first connecting rods (81) is in a downward rotation state; One end of the second connecting rod (82) is hinged to the bottom longitudinal beam template (6), and the other end is hinged to the upward rotating end of the upward rotating first connecting rod (81), and the second connecting rod (82) is arranged in parallel with the downward rotating first connecting rod (81); One end of the third connecting rod (83) is hinged to the bottom longitudinal beam template (6), and the other end is hinged to the left template (1), and the third connecting rod (83) is arranged parallel to the upwardly rotating first connecting rod (81).

3. The inlet and outlet mechanism of the box beam inner mold according to claim 2 is characterized in that: The first connecting rod (81) and the second connecting rod (82) that rotate downward are both hinged to the third connecting rod (83) while maintaining parallelism.

4. The inlet and outlet mechanism of the box beam inner mold according to claim 2 is 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 template (6); The second connecting rods (82) in the two connecting rod groups are hinged to each other at their ends located at the central axis, and are hinged to the bottom longitudinal beam template (6); The third connecting rods (83) in the two groups of connecting rod assemblies are hinged to each other at the ends located at the central axis, and are hinged to the bottom longitudinal beam template (6).

5. The retractable and indirect mechanism of the inner mold of a box beam according to claim 4, characterized in that: A first mounting seat (3) is provided on the inner side of the left side template (1); a hinge point of the first connecting rod (81) at the first mounting seat (3) is a first sliding hinge point (84); and a hinge point between the first mounting seat (3) and the third connecting rod (83) is a first fixed hinge point (87).

6. The inlet and outlet mechanism of the box beam inner mold according to claim 4 is characterized in that: A second mounting seat (4) is provided on the inner side of the right side template (2); a hinge point of the first connecting rod (81) at the second mounting seat (4) is a second sliding hinge point (86); and a hinge point between the second mounting seat (4) and the third connecting rod (83) is a second fixed hinge point (89).

7. The inlet and outlet mechanism of the box beam inner mold according to claim 4 is characterized in that: A third mounting seat (7) is provided on the top of the bottom longitudinal beam template (6); a hinge point of the second connecting rod (82) at the third mounting seat (7) is a third sliding hinge point (85); and a hinge point between the third mounting seat (7) and the third connecting rod (83) is a third fixed hinge point (88).

8. The retractable and indirect mechanism of the inner mold of a box beam according to claim 5, characterized in that: The first mounting seat (3) is provided with a first sliding groove (31), and in the connecting rod group connected to the left template (1), when the angle between the first connecting rod (81) rotating downward and the third connecting rod (83) changes, the first sliding hinge point (84) slides up and down in the first sliding groove (31).

9. The inlet and outlet mechanism of the box beam inner mold according to claim 6, characterized in that: The second mounting seat (4) is provided with a second slide groove (41), and in the connecting rod group connected to the right template (2), when the angle between the first connecting rod (81) rotating downward and the third connecting rod (83) changes, the second sliding hinge point (86) slides up and down in the second slide groove (41).

10. The retractable and indirect mechanism of the inner mold of a box beam according to claim 7, characterized in that: The third mounting seat (7) is provided with a third sliding groove (71), and in any connecting rod assembly, when the 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 sliding groove (71).

11. The inlet and outlet mechanism of the box beam inner mold according to claim 1, characterized in that: The driving device is an oil cylinder (5), and the oil cylinder (5) is arranged between the left-side template (1) and the right-side template (2). The oil cylinder (5) can drive the left-side template (1) and the right-side template (2) to perform horizontal opening and closing movements.

12. A method for the collection and expenditure of a box beam inner mold, characterized in that: The mold closing is performed using the box beam inner mold closing and expansion mechanism according to any one of claims 1 to 11, characterized in that it comprises: In the first state, the left side template (1) and the right side template (2) are driven to move horizontally away from each other, the angle between the two third connecting rods (83) in the assembly (8) increases, the third fixed hinge point (88) moves downward, and the bottom longitudinal beam template (6) moves downward until the lower end surface of the left side template (1), the lower end surface of the right side template (2) and the lower end surface of the bottom longitudinal beam template (6) are located on the same horizontal plane, and the formwork is completed; In the second state, the left side template (1) and the right side template (2) are driven to move horizontally toward each other, the angle between the two third connecting rods (83) in the assembly (8) decreases, the third fixed hinge point (88) moves upward, and the bottom longitudinal beam template (6) moves upward until the bottom longitudinal beam template is completely located in the enclosed space formed by the left side template (1) and the right side template (2), and the mold closing is completed.

13. A box girder inner mold ins and outs method according to claim 12, characterized in that: When the bottom longitudinal beam template (6) moves, based on the position limitation of the third sliding hinge point (85) by the third sliding groove (71), the third sliding hinge point (85) slides in the third sliding groove (71), so that the movement direction of the bottom longitudinal beam template (6) remains vertical.

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