CN114161550A

CN114161550A - Integrally-walking type template system for prefabricated small box girder

Info

Publication number: CN114161550A
Application number: CN202111275828.4A
Authority: CN
Inventors: 赵立财
Original assignee: China Railway 19th Bureau Group Co Ltd; Fifth Engineering Co Ltd of China Railway 19th Bureau Group Co Ltd
Current assignee: China Railway 19th Bureau Group Co Ltd; Fifth Engineering Co Ltd of China Railway 19th Bureau Group Co Ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-03-11
Anticipated expiration: 2041-10-29
Also published as: CN114161550B

Abstract

The invention relates to a prefabricated small box girder integral traveling type template system which comprises two groups of side molds, wherein the two groups of side molds are oppositely arranged and are used for molding the side surfaces of a girder body; the supporting devices are arranged in two groups, and the two groups of supporting devices are correspondingly arranged below the two groups of side molds; two sets of strutting arrangement all includes the locomotive, be provided with translation system and jacking system on the locomotive, the one end of jacking system with the side form is connected, the other end with translation headtotail, translation headtotail is in on the locomotive, and change the horizontal distance of jacking system and roof beam body, this system can make the pouring of every section prefabricated little case roof beam accomplish the back and need not assemble again after demolising the side form, by a wide margin improvement work efficiency to the setting of locomotive can make the side form remove with holistic form all the time, and the side form can directly use whole steel sheet.

Description

Integrally-walking type template system for prefabricated small box girder

Technical Field

The utility model relates to a building engineering technical field especially relates to a prefabricated small box girder integrally walking type template system.

Background

The prefabricated box girder is a flexural member which is prefabricated in advance by tensioning prestressed reinforcements by a pre-tensioning method or a post-tensioning method and then is transported to a construction site for installation.

At present, when a prefabricated box girder is poured, the side molds are supported and fixed through the ground feet generally, the whole side mold needs to be disassembled to the next pouring position for re-assembling when pouring work of one section of the prefabricated box girder is completed, the whole process is very complicated, a lot of time is wasted at the same time, the work efficiency of the whole project is reduced, moreover, the side molds on the same side need to be re-aligned during assembling work of the side molds at each time, otherwise, unevenness of the surface of the poured prefabricated box girder easily occurs, the leveling phenomenon needs to be additionally repaired, the work types are repeatedly changed, the side molds are repeatedly assembled and disassembled, the work efficiency is low, and the labor intensity of workers is greatly increased.

Disclosure of Invention

In order to solve when pouring the precast box girder, need carry out the split and assemble the side form many times, need align again when assembling, so change over work type repeatedly, lead to the work efficiency of whole engineering low, greatly increased workman's intensity of labour's technical problem again, this disclosure provides a little box girder of prefabrication whole walking formula template system.

The integrally walking type template system comprises two groups of side molds, wherein the two groups of side molds are arranged oppositely and are used for forming the side surfaces of a beam body;

the supporting devices are arranged in two groups, and the two groups of supporting devices are correspondingly arranged below the two groups of side molds; two sets of strutting arrangement all includes the locomotive, be provided with translation system and jacking system on the locomotive, the one end of jacking system with the side form is connected, the other end with translation headtotail, translation system mounting is in on the locomotive, and change the horizontal distance of jacking system and roof beam body.

Optionally, the locomotive includes wheel and motor, the quantity of wheel is a plurality of, and is a plurality of the wheel sets up on the locomotive, the quantity of motor is two sets of, and two sets of the motor is along the diagonal angle setting on the locomotive to the drive is located the diagonal angle respectively the wheel.

Optionally, the side form is including laminating subassembly and side form support frame, the side laminating of laminating subassembly and roof beam body, the side form support frame is installed on the jacking system, the side form support frame sets up one side of roof beam body is kept away from to the laminating subassembly to the laminating support the laminating subassembly.

Optionally, the lifting device further comprises a pull rod mechanism, the pull rod mechanism comprises an upper pull rod assembly and a lower pull rod assembly, the two ends of the upper pull rod assembly are respectively connected with the upper ends of the side form supporting frames on the two sides, and the two ends of the lower pull rod assembly are respectively connected with the lower ends of the side form supporting frames on the two sides.

Optionally, still include the pedestal die block, the pedestal die block is used for bearing the weight of the roof beam body to as the die block of the roof beam body, be provided with the confession on the pedestal die block the pore that lower link assembly passed, be provided with in the pore and reserve the sleeve pipe.

Optionally, the laminating subassembly includes first laminating portion and second laminating portion, the laminating of first laminating portion sets up on the lateral wall of side form support frame orientation roof beam body, the second laminating portion includes first squaring board, second squaring board and coupling assembling, the second squaring board sets up the tip of first laminating portion, one of them plane of first squaring board with one of them plane laminating setting of second squaring board, another vertical upwards extension in plane of first squaring board, and exceed first laminating portion, coupling assembling will first squaring board with the second squaring board is connected fixedly.

Optionally, the jacking system includes a first hydraulic cylinder group, one end of the first hydraulic cylinder group is connected to the side mold support frame, the other end of the first hydraulic cylinder group is connected to the translation system, an included angle is formed between an axis of the first hydraulic cylinder group and a horizontal plane, and the included angle is greater than 0 degree and smaller than 180 degrees.

Optionally, the translation system includes a second hydraulic cylinder group, one end of the second hydraulic cylinder group is connected to the jacking system, the other end of the second hydraulic cylinder group is disposed on the mobile vehicle, and an axis of the second hydraulic cylinder group is parallel to the horizontal plane and perpendicular to an axis of the beam body.

Optionally, the side form supporting frame further comprises a ground foot support, the ground foot support is connected with the side form supporting frame, and the ground foot support is used for supporting the side form supporting frame.

Optionally, still include centre form and end mould, two sets of the side form symmetry sets up the both sides of centre form, the quantity of end mould has two sets ofly, and is two sets of the end mould sets up the both ends of centre form and will the centre form with the side form is connected, the centre form is by two articulated formation of interior die carrier, two the symmetry is provided with two sets of centre form strutting arrangement between the interior die carrier, centre form strutting arrangement includes link assembly and locking subassembly, link assembly is the articulated connecting rod structure of multistage to both ends set up respectively on the inner wall of interior die carrier, the locking subassembly sets up two the expansion end of interior die carrier.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the utility model provides a prefabricated little case roof beam is walked formula template system entirely, need not assemble again after the pouring that can make every section prefabricated little case roof beam is accomplished the side form and demolish, by a wide margin improvement work efficiency to the setting up of locomotive can make the side form move with holistic form all the time, and the side form can directly use whole steel sheet, makes the side of little case roof beam level and more smooth, and the pouring effect is better.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of an integrally-walking type formwork system for prefabricated small box girders according to an embodiment of the disclosure;

FIG. 2 is a schematic structural view of a removal trolley of the prefabricated small box girder integrally-traveling formwork system according to the embodiment of the disclosure;

FIG. 3 is a side view of an integrally walking formwork system for prefabricated box girders according to an embodiment of the disclosure;

fig. 4 is a schematic structural diagram of a mobile cart according to an embodiment of the disclosure;

fig. 5 is a schematic structural diagram of an inner mold according to an embodiment of the present disclosure;

fig. 6 is a schematic structural view of a second attaching portion according to an embodiment of the disclosure.

Wherein, 1, a pedestal bottom die; 21. side mould; 211. a side form support frame; 212. a first bonding portion; 213. a second bonding portion; 214. a first gusset; 215. a connecting assembly; 216. a second rectangular plate; 22. an inner mold; 221. an inner mould frame; 23. end die; 24. a stiffening beam; 31. supporting the ground feet; 32. a mobile vehicle; 321. a motor; 322. a translation system; 323. a jacking system; 324. a wheel; 41. an upper tie rod assembly; 42. a lower pull rod assembly; 51. a connecting rod assembly; 511. a double link; 512. a lock pin; 513. a control beam; 52. a locking assembly; 6. a shoulder pole beam structure; 7. a construction platform; 8. a tray; 9. and (4) mounting the groove.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

In the prior art, the side molds are supported and fixed through the ground feet, the whole side mold needs to be disassembled to the next pouring position for re-assembling when pouring work of one section of the prefabricated box girder is completed, the whole process is very complicated, a lot of time is wasted, the work efficiency of the whole project is reduced, not only is the side mold needs to be re-aligned every time when the side mold is assembled, but also the surface unevenness of the poured prefabricated box girder easily occurs, the phenomenon of extra repairing and leveling is needed, the work types are repeatedly changed, the side mold is repeatedly assembled and disassembled, the work efficiency is low, and the labor intensity of workers is greatly increased.

On the basis, the embodiment provides a prefabricated small box girder integrally-walking type template system and method, the side mold does not need to be disassembled and then assembled again after pouring of each section of prefabricated small box girder is completed, the working efficiency is greatly improved, the moving vehicle can enable the side mold to move in an integral mode all the time, the side mold can directly use an integral steel plate, the side face of the small box girder is enabled to be more smooth, and the pouring effect is better. This is illustrated in detail by the following specific examples:

referring to fig. 1 to 4, the integrally walking type formwork system for the prefabricated small box girder provided by the embodiment includes two sets of side molds 21, wherein the two sets of side molds 21 are arranged oppositely for forming the side surface of the girder;

the number of the supporting devices is two, and the two groups of supporting devices are correspondingly arranged below the two groups of side dies 21; the two groups of supporting devices comprise a moving vehicle 32, a translation system 322 and a jacking system 323 are arranged on the moving vehicle 32, one end of the jacking system 323 is connected with the side mold 21, the other end of the jacking system 323 is connected with the translation system 322, the translation system 322 is arranged on the moving vehicle 32, the horizontal distance between the jacking system 323 and a beam body is changed, the moving vehicle 32 is used for supporting the side mold 21, and after one section of prefabricated small box girder is poured, the whole side mold 21 is driven to be separated from the poured beam body, the whole side mold 21 is moved to the pouring position of the next section of prefabricated small box girder, then the side mold 21 is pushed to the working position again for pouring the next section of prefabricated small box girder, the arrangement can ensure that the side mold 21 does not need to be disassembled and then assembled again after the pouring of each section of prefabricated small box girder is finished, the working efficiency is greatly improved, and the moving vehicle 32 can enable the side mold 21 to move in an integral mode all the time, the side die 21 can directly use an integral steel plate, so that the side surface of the small box girder is smoother, and the pouring effect is better.

In a further embodiment, the construction platform 7 is disposed above the side mold 21, so that the construction operation of the side mold 21 and the first straight angle plate 214 can be more conveniently performed, and the construction efficiency can be effectively improved.

The moving vehicle 32 includes a plurality of wheels 324 and motors 321, the number of the wheels 324 is multiple, the plurality of wheels 324 are disposed on the moving vehicle 32, the number of the motors 321 is two, the two sets of motors 321 are disposed on the moving vehicle 32 along opposite angles and respectively drive the wheels 324 located at the opposite angles, the motors 321 disposed at the opposite angles can enable the moving vehicle 32 to adjust the direction of the moving vehicle 32 by controlling the rotating speed and the rotating direction of the motors 321 at the opposite angles without a steering system, and it should be noted that the moving vehicle 32 is provided with a mounting groove 9 for mounting the translation system 322.

It is comparatively preferred, the side form 21 is including laminating subassembly and side form support frame 211, the side laminating of laminating subassembly and roof beam body, side form support frame 211 is installed on jacking system 323, side form support frame 211 sets up the one side of keeping away from the roof beam body at the laminating subassembly, and the laminating supports the laminating subassembly, it needs to explain, be equipped with stiffening beam 24 that is used for consolidating side form support frame 211 on the side form support frame 211, stiffening beam 24 sets up the great position department of stress on side form support frame 211, prevent the problem that side form support frame 211 damaged.

Exemplarily, the box girder structure further comprises a pull rod mechanism, the pull rod mechanism comprises an upper pull rod assembly 41 and a lower pull rod assembly 42, two ends of the upper pull rod assembly 41 are respectively connected with the upper ends of the side mould supporting frames 211 on two sides, two ends of the lower pull rod assembly 42 are respectively connected with the lower ends of the side mould supporting frames 211 on two sides, the side moulds 21 on two sides can be relatively fixed through the arrangement of the pull rod mechanism, the pull rod mechanism is used for offsetting the pressure of concrete on the side moulds 21 during pouring, so that the smooth pouring work is ensured, and the shape of the small box girder is further ensured to meet the requirements.

It should be noted that the structure further comprises a pedestal bottom die 1, wherein the pedestal bottom die 1 is used for bearing a beam body and is used as a bottom die of the beam body, a hole for the lower pull rod assembly 42 to pass through is formed in the pedestal bottom die 1, a reserved sleeve is arranged in the hole, the lower pull rod assembly 42 can more conveniently pass through the pedestal bottom die 1 by the reserved sleeve to complete transverse pulling work, the reserved sleeve is a PVC pipe, a plurality of PVC pipes are uniformly arranged along the arrangement direction of the beam body, the interval between every two PVC pipes is 0.5-1m, the upper pull rod assembly 41 and the lower pull rod assembly 42 can be correspondingly arranged, and the PVC pipes can also be arranged in a staggered manner.

In some embodiments, the two ends of the upper pull rod assembly 41 and the two ends of the lower pull rod assembly 42 are both provided with the carrying pole beam structures 6, the carrying pole beam structures 6 are used for fixing the ends of the upper pull rod assembly 41 and the lower pull rod assembly 42 on the side mold supporting frame 211, and the force application area of the upper pull rod assembly 41 and the lower pull rod assembly 42 to the side mold supporting frame 211 is greatly increased when the upper pull rod assembly 41 and the lower pull rod assembly 42 are fixed, so that the stress of the side mold supporting frame 211 is more dispersed, and the deformation of the side mold supporting frame 211 generated when the upper pull rod assembly 41 and the lower pull rod assembly 42 are fixed is reduced.

That is, the attaching assembly includes a first attaching portion 212 and a second attaching portion 213, the first attaching portion 212 is attached to the side wall of the side mold support 211 facing the beam body, the second attaching portion 213 includes a first right-angle plate 214, a second right-angle plate 216 and a connecting assembly 215, the second right-angle plate 216 is disposed at the end of the first attaching portion 212, one plane of the first right-angle plate 214 is attached to one plane of the second right-angle plate 216, the other plane of the first right-angle plate 214 extends vertically upwards, and is higher than the first attaching portion 212, the connecting component 215 connects and fixes the first right-angle plate 214 and the second right-angle plate 216, wherein the connecting assembly 215 comprises an F-shaped connecting plate and a connecting bolt in threaded connection with the F-shaped connecting plate, the F-shaped connecting plate clamps the joint part of the first right-angle plate 214 and the second right-angle plate 216, and the jointed surfaces of the first right-angle plate 214 and the second right-angle plate 216 are tightly pressed and fixed by using connecting bolts.

During the concrete implementation, jacking system 323 includes first hydraulic cylinder group, wherein one end and the side form support frame 211 of first hydraulic cylinder group are connected, the other end is connected with translation system 322, the axis and the horizontal plane formation contained angle of first hydraulic cylinder group, the contained angle is greater than 0 degree, and be less than 180 degrees, jacking system 323 is used for accomplishing the rising of side form 21 and the work that reduces, make the side form 21 tentatively break away from the roof beam body and be close to the roof beam body, wherein, the top of first hydraulic cylinder group is equipped with tray 8, tray 8 can make the more steady support side form support frame 211 of first hydraulic cylinder group, the supporting effect is better, it is more reliable and more stable to work.

The translation system 322 comprises a second hydraulic cylinder group, one end of the second hydraulic cylinder group is connected with the jacking system 323, the other end of the second hydraulic cylinder group is arranged on the moving vehicle 32, the axis of the second hydraulic cylinder group is parallel to the horizontal plane and is perpendicular to the axis of the beam body, and the side die 21 is made to complete the work of separating from the beam body and reaching the designated station through the matching work of the translation system 322 and the jacking system 323.

Meanwhile, the small box girder forming machine further comprises a foot support 31, a plurality of foot supports 31 are connected with the side mould supporting frame 211 along the foot supports 31, the foot supports 31 are used for supporting the side mould supporting frame 211, wherein the foot supports 31 can provide reliable supporting force for the parts of the side mould 21 which are not supported by the jacking system 323, the side mould 21 is prevented from displacement and deformation, and smooth forming work of the small box girder is further ensured, the specific use method is that when the moving vehicle 32 moves the side mould 21 to a working place, the foot supports 31 are extended to be in contact with the ground, the bottom of the foot supports 31 is supported on the ground, the side mould 21 is supported, when the side mould 21 needs to be moved, the foot supports 31 are firstly retracted to be separated from the ground, then when the moving vehicle 32 moves the side mould 21 to another working place, the foot supports 31 are extended to be in contact with the ground again, and the bottom of the foot supports 31 are supported on the ground, the opposite side mold 21 begins to support.

In this embodiment, it is preferable that the mold further includes an inner mold 22 and end molds 23, two sets of side molds 21 are symmetrically disposed on two sides of the inner mold 22, there are two sets of end molds 23, two sets of end molds 23 are disposed on two ends of the inner mold 22 and connect the inner mold 22 and the side molds 21, the inner mold 22 is formed by two inner mold frames 221 which are hinged to each other, two sets of inner mold supporting devices are symmetrically disposed between the two inner mold frames 221, each inner mold supporting device includes a connecting rod assembly 51 and a locking assembly 52, the connecting rod assembly 51 is a multi-segment hinged connecting rod structure, and both ends are respectively provided on the inner walls of the inner mold frames 221, the locking assembly 52 is provided at the movable ends of the two inner mold frames 221, the inner die 22 can be directly collapsed inwards after the forming work of the small box girder is finished through the connecting rod assembly 51 and the locking assembly 52, the small box girder can be taken out more conveniently, then put into the casting station of the next section of small box girder for use, thus greatly improving the working efficiency of the whole casting work.

In some embodiments, the connecting rod assembly 51 comprises a double connecting rod 511 and a locking pin 512, the double connecting rod 511 is composed of two hinged connecting rods, and two ends of the two connecting rods are correspondingly hinged with the inner wall of the inner die 22, and the two connecting rods in the double connecting rod 511 are fixed through the locking pin 512, so that the self-locking of the connecting rod assembly 51 is realized.

In a further embodiment, the control beam 513 is rotatably connected to the hinge position of two links of the double links 511, the control beam 513 extends along the direction of the inner mold 22 and is rotatably connected to the hinge position of all the double links 511, and by the arrangement of the control beam 513, a constructor can control the bending degree of all the link assemblies 51 at the end mold 23, so that the construction efficiency is improved while the safety is improved.

The specific implementation manner and implementation principle are the same as those of the above embodiment, and the same or similar technical effects can be brought, and no further description is given here, and reference may be specifically made to the description of the embodiment of the prefabricated small box girder integrally-walking template system.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a prefabricated little box girder wholly walks capable template system which characterized in that includes:

the number of the side dies (21) is two, and the two groups of the side dies (21) are arranged oppositely and used for forming the side surface of the beam body;

the number of the supporting devices is two, and the two groups of supporting devices are correspondingly arranged below the two groups of side molds (21); two sets of strutting arrangement all includes locomotive (32), be provided with translation system (322) and jacking system (323) on locomotive (32), the one end of jacking system (323) with side form (21) are connected, the other end with translation system (322) are connected, translation system (322) are installed on locomotive (32), and change the horizontal distance of jacking system (323) and roof beam body.

2. The integrally running formwork system for precast box girders according to claim 1, wherein the moving vehicle (32) comprises a plurality of wheels (324) and motors (321), the plurality of wheels (324) are provided on the moving vehicle (32), the plurality of motors (321) are provided in two sets, and the two sets of motors (321) are provided diagonally on the moving vehicle (32) and drive the wheels (324) located diagonally, respectively.

3. The integrally walking type formwork system for the prefabricated small box girders as claimed in claim 1, wherein the side forms (21) comprise a laminating assembly and side form supporting frames (211), the laminating assembly is laminated with the side faces of the girder, the side form supporting frames (211) are installed on the jacking system (323), the side form supporting frames (211) are arranged on one side, away from the girder, of the laminating assembly, and the laminating assembly supports the laminating assembly.

4. The integrally walking type formwork system for precast small box girders according to claim 3, further comprising a pull rod mechanism, wherein the pull rod mechanism comprises an upper pull rod assembly (41) and a lower pull rod assembly (42), two ends of the upper pull rod assembly (41) are respectively connected with the upper ends of the side form supporting frames (211) on two sides, and two ends of the lower pull rod assembly (42) are respectively connected with the lower ends of the side form supporting frames (211) on two sides.

5. The integrally walking type formwork system for precast box girders according to claim 4, further comprising a pedestal bottom formwork (1), wherein the pedestal bottom formwork (1) is used for bearing the girder and is used as the bottom formwork of the girder, a hole for the lower pull rod assembly (42) to pass through is formed in the pedestal bottom formwork (1), and a reserved sleeve is arranged in the hole.

6. The integrally running formwork system for precast box girders according to claim 3, the attaching assembly comprises a first attaching part (212) and a second attaching part (213), the first attaching part (212) is attached to the side wall of the side die supporting frame (211) facing the beam body, the second attaching part (213) comprises a first right-angle plate (214), a second right-angle plate (216) and a connecting component (215), the second right-angle plate (216) is arranged at the end part of the first attaching part (212), one plane of the first right-angle plate (214) is arranged to be attached to one plane of the second right-angle plate (216), the other plane of the first right-angle plate (214) extends vertically upwards, and the connecting component (215) is higher than the first attaching part (212) and fixedly connects the first right-angle plate (214) with the second right-angle plate (216).

7. The integrally walking formwork system for precast box girders according to claim 3, wherein the jacking system (323) comprises a first hydraulic cylinder group, one end of the first hydraulic cylinder group is connected with the side formwork support frame (211), the other end of the first hydraulic cylinder group is connected with the translation system (322), and the axis of the first hydraulic cylinder group forms an included angle with the horizontal plane, and the included angle is greater than 0 degree and less than 180 degrees.

8. The integrally walking formwork system for precast box girders according to claim 7, wherein the translation system (322) comprises a second hydraulic cylinder group, one end of which is connected with the jacking system (323) and the other end is arranged on the moving vehicle (32), and the axis of the second hydraulic cylinder group is parallel to the horizontal plane and perpendicular to the axis of the girder.

9. The integrally-walking formwork system for the precast box girders according to claim 3, further comprising a foot support (31), wherein the foot support (31) is connected with the side formwork support frame (211), and the foot support (31) is used for supporting the side formwork support frame (211).

10. The integrally walking type formwork system for the precast small box girder according to claim 1, further comprising an inner mold (22) and end molds (23), wherein two sets of the side molds (21) are symmetrically arranged at two sides of the inner mold (22), the number of the end dies (23) is two, the two end dies (23) are arranged at two ends of the inner die (22) and connect the inner die (22) with the side die (21), the inner mold (22) is formed by hinging two inner mold frames (221), two groups of inner mold supporting devices are symmetrically arranged between the two inner mold frames (221), the inner mold supporting device comprises a connecting rod assembly (51) and a locking assembly (52), the connecting rod assembly (51) is of a multi-section hinged connecting rod structure, and both ends are respectively arranged on the inner wall of the inner die carrier (221), and the locking assembly (52) is arranged at the movable ends of the two inner die carriers (221).