CN105965672B - A kind of fabricated shear wall model structure unitary mould - Google Patents

Abstract

The invention discloses a kind of fabricated shear wall model structure unitary mould, tool belongs to assembling concrete model structure construction field, for solving the class model because structure space is narrow and small, template construct and the difficult problem that assembled assembling structure construction technology can not be realized with conventional template of dismounting.The outer modular system that the fabricated shear wall model structure unitary mould is made of the first exterior sheathing and the second exterior sheathing, the inner formwork system of first inner template, the second inner template and the 3rd inner template composition, and wall thickness regulating device is provided with, hole molding machine, skeleton separate gauze and suspension arrangement.The making and dismounting of the narrow and small structure space template of model can be facilitated using the present invention, mitigate infringement of the violence form removal to model structure, realize fabricated shear wall model structure construction technology at the same time, the making available for the cast-in-place shear wall model structure or fabricated shear wall model structure that architectural plan is formed by elementary cell of " mouth " type.

Description

An integral mold of an assembled shear wall model structure

technical field

The present invention relates to the construction field of prefabricated concrete model structures, in particular to an integral mold for prefabricated shear wall model structures, which can be used for cast-in-place shear wall model structures or prefabricated model structures such as "mouth" as the basic unit to form a building plan. Fabrication of shear wall model structures.

Background technique

In the field of civil engineering, in order to test new structural design theories or new structural systems, it is generally tested or verified through model structural test research. The model structure is designed, calculated and produced according to a certain similarity theory after geometric scaling. For the shear wall model structure, the storey height is generally 300mm-800mm, the wall thickness is 20mm-50mm, the opening size and wall thickness are small, and the low-strength and low-elastic modulus concrete is used, and the later formwork is difficult to remove. It will cause damage to the model structure and further affect the accuracy of the test results. For the prefabricated shear wall model structure, according to the construction technology of the prototype structure, the concrete of the model structure wall should be poured twice, and a vertical separation joint should be formed at the contact part between the prefabricated wall and the cast-in-place part. It is a difficult problem to set up a reasonable and effective partition device and combine it with the formwork.

The traditional large-scale model structure is made of wooden formwork or foam. Wooden formwork is not easy to dismantle and the number of times of reuse is low. When making foam, the cost is high, and the finished model structure has a rough surface and fuzzy edges and corners.

Contents of the invention

In view of the problems existing in the above-mentioned prior art, the object of the present invention is to provide an integral mold for an assembled shear wall model structure, which facilitates the manufacture and removal of the formwork in the narrow space of the model structure, and reduces the damage to the model structure caused by violent formwork demolition , to reduce the impact on the test results. It can be used in the manufacture of cast-in-place shear wall model structures or prefabricated shear wall model structures that use the "mouth" type as the basic unit to form a building plan.

The present invention adopts following technical scheme:

An integral mold for a prefabricated shear wall model structure, including an outer mold system and an inner mold system arranged inside the outer mold system:

The outer mold system includes a pair of first outer templates arranged in parallel and a second outer template arranged in parallel, the ends of the first outer template and the second outer template are connected to make the outer mold system a rectangular structure; The outer wall of the second outer formwork is provided with a first card rib along the length direction of the second outer formwork;

The inner mold system includes a pair of first inner templates arranged in parallel and a second inner template arranged in parallel, the ends of the first inner template and the second inner template are connected to make the inner mold system a rectangular structure; The inner wall of the second inner formwork is provided with a second card rib along the length direction of the second inner formwork;

A suspension device is provided between the outer mold system and the inner mold system. The suspension device includes a screw mandrel. A pair of positioning pieces are set on the screw mandrel. A slot is provided on the side of each positioning piece. Through the slot on the positioning piece and the The cooperation of the first rib and the second rib realizes the connection between the outer mold system and the inner mold system;

A third inner formwork is arranged above the inner formwork system through a supporting device.

Further, the first outer template includes a first plate body and a pair of webs arranged on the same side edge of the first plate body and parallel to each other, and a plurality of L-shaped notches are opened on each web plate One end of the notch passes through the side of the web; the second outer formwork includes a second plate body, and fixing bolts are distributed on the edge of the second plate body along the width direction.

Further, the outer walls of the first outer template and the second outer template are provided with ribs in rows, and each row of ribs is perpendicular to each column of ribs; on the first outer template and the second outer template A plurality of positioning holes penetrating through the first outer formwork and the second outer formwork are evenly distributed.

Further, the first inner template includes a first split board, a second split board and a third split board, wherein the structures and specifications of the first split board and the third split board are the same, and the width of the second split board is smaller than The first split board; the two sides of the second split board are provided with first fixing grooves, and the edges of the first split board and the second split board are all provided with second fixing grooves fitting with the first fixing grooves; on the second split board A fixed steel plate is detachably arranged on the surface through assembly bolts, and the length of the fixed steel plate is greater than the width of the second split plate.

Further, the supporting device is a pressure-bearing ear plate arranged on the sides of the first split plate and the third split plate, a platform pressure-bearing plate is placed on the pressure-bearing ear plate, and the upper surface of the platform pressure-bearing plate is in contact with the first The end surfaces of the spliced plates are flush; grooves are distributed at equal intervals on the platform pressure plate.

Further, the third inner formwork is a reinforced concrete structure, and the reinforcement inside the third inner formwork is cold-drawn steel wire, and the cold-drawn steel wire passes through the end surface of the third inner formwork.

Further, a wall thickness adjustment device is provided between the inner mold system and the outer mold system, the wall thickness adjustment device includes a positioning nut, and one end of the positioning nut is coaxially connected with a ferrule with an external thread; through the positioning The nut and the ferrule are provided with an adjusting rod, and one end of the adjusting rod has a section of external thread, and the section provided with the external thread is larger in diameter than the part without external thread on the adjusting rod; the end of the adjusting rod is provided with one end of the external thread It has an external hexagonal structure, and the surface of the end without external thread is covered with a layer of 2mm thick rubber sleeve.

Further, a skeleton separating gauze is detachably arranged between the outer mold system and the inner mold system, and the skeleton separating gauze is a rectangular frame structure composed of four sections of rectangular frames detachably assembled; inside the rectangular frame A gauze is provided, and the edge of the gauze is wrapped with a skeleton steel sheet; the inner wall of the outer mold system and the outer wall of the inner mold system are symmetrically arranged with chutes along the direction perpendicular to the ground, and the skeleton separates the gauze through the chute Installed between the inner mold system and the outer mold system.

Further, the outer wall of the inner mold system is detachably provided with a hole forming device. The hole forming device includes a rectangular structure composed of four sections of bar magnets. A reinforcing device is provided inside the rectangular structure. The reinforcing device includes a cross-shaped The supporting rod is arranged, and the end of the supporting rod is provided with a supporting sheet; after the reinforcement device is installed inside the rectangular structure, the supporting sheet is in close contact with the bar magnet to play a supporting role; the width of the bar magnet is the same as that of the inner mold The distance between the system and the outer mold system is the same, and a rubber ring is sheathed outside the rectangular structure.

Compared with the prior art, the present invention has the following technical characteristics:

1. The integral structure mold of the present invention has high reuse times, is easy to dismantle, and can be combined with the assembly-type model structure construction technology, and can be used for cast-in-place shear wall model structures or assembly-type shear walls that use the "mouth" type as the basic unit to form a building plan. Fabrication of force wall model structure;

2. Adopting the present invention can facilitate the manufacture and dismantling of the formwork in the narrow structure space of the model, reduce the damage to the model structure caused by violent form removal, and have little influence on the experimental results, and provide a new research tool for the field of prefabricated concrete model structure construction .

Description of drawings

Fig. 1 is the structural representation of external mold system;

Fig. 2 is the structural representation of the first outer formwork;

Fig. 3 is the structural representation of the second outer formwork;

Fig. 4 is the structural schematic diagram that suspension device cooperates with inner mold system, outer mold system;

Fig. 5 is the structural decomposition diagram of internal model system;

Fig. 6 is a schematic exploded view of the structure of the first inner template;

Fig. 7 is a schematic exploded view of the structure of the second inner template;

Fig. 8 is a schematic structural diagram of a third inner template;

Fig. 9 is a schematic exploded view of the structure of the hole forming device;

Fig. 10 is the structural representation of wall thickness adjusting device;

Fig. 11 is the schematic diagram of the structural decomposition of the skeleton separating gauze;

A—outer mold system, B—inner mold system, 1—first outer formwork, 2—second outer formwork, 3—positioning hole, 4—rib, 5—positioning piece, 6—chute, 7—notch, 8 —web plate, 9—first rib, 10—fixing bolt, 11—second inner formwork, 12—slot, 13—skeleton separating gauze, 131—frame, 132—skeleton steel sheet, 133—gauze, 14—screw rod, 15—third inner formwork, 151—rebar, 16—platform bearing plate, 17—first inner formwork, 171—first split plate, 172—second split plate, 173—third split plate , 174—assembly bolts, 175—pressure lug plate, 18—fixed steel plate, 19—hole forming device, 191—bar magnet, 192—rubber ring, 193—reinforcement device, 194—support piece, 20—groove, 21—adjusting rod, 22—ferrule, 23—locating nut.

Detailed ways

According to the above-mentioned technical scheme, as shown in Figure 1 to Figure 11, an integral mold of a prefabricated shear wall model structure includes an outer mold system A and an inner mold system B arranged inside the outer mold system A:

The outer mold system A includes a pair of first outer formwork 1 arranged in parallel and a second outer formwork 2 arranged in parallel. The ends of the first outer formwork 1 and the second outer formwork 2 are connected so that the outer mold system A It is a rectangular structure, that is, viewed from a top view, the first outer template 1 and the second outer template 2 are two mutually parallel sides of a rectangle respectively; the specifications of the two first outer templates 1 are the same, and the two second outer templates The specifications of the templates 2 are the same, the length of the first outer template 1 is smaller than that of the second outer template 2 , and the width of the first outer template 1 is the same as that of the second outer template 2 . The outer wall of the second outer formwork 2 is provided with first ribs 9 along the length direction of the second outer formwork 2 .

As shown in Figure 2, the first outer template 1 includes a first plate body and a pair of webs 8 that are arranged on the same side edge of the first plate body and are parallel to each other, and the thickness of the webs 8 is 5 mm; on each web 8 A plurality of L-shaped notches 7 are provided, and one end of the notch 7 passes through the side of the web 8, that is, one end of the notch 7 penetrates and the other end does not penetrate; the thickness of the notch 7 is 5mm, the width is 17mm, and the length and width are 35mm The web 8 and the first plate jointly form the shape of "[", which is convenient for installation with the second outer formwork 2; the second outer formwork 2 includes a second plate body, and the second plate body is along the width direction Fixing bolts 10 are distributed on the edge of the first outer formwork 1; when installing the second outer formwork 2 of the first outer formwork 1, the first outer formwork 1 and the second outer formwork 2 are slightly staggered in the vertical direction so that the second outer formwork 2, the fixing bolt 10 first slides into the notch 7, and then lifts up, so that the fixing bolt 10 is stuck at the end of the notch 7. At this time, the tops of the first outer formwork 1 and the second outer formwork 2 are still flush, but Due to the setting of the gap 7, the first outer template 1 and the second outer template 2 can not be separated in the horizontal direction, thereby ensuring the firmness of the structure; Solid, to realize the relative fixation of the first outer formwork 1 and the second outer formwork 2.

As shown in Figure 2 and Figure 3, ribs 4 are arranged in rows and rows on the outer walls of the first outer formwork 1 and the second outer formwork 2, and each row of ribs 4 is perpendicular to each row of ribs 4; the ribs 4 adopt The welding method is fixed, the thickness is 4mm, the width is 50mm; the spacing is 200mm, forming a "well" type network, its function is to improve the in-plane rigidity of the outer formwork, reduce the additional deformation caused by model making, and affect the surface of the structural wall flatness. On the first outer template 1 and the second outer template 2, there are a plurality of positioning holes 3 penetrating the first outer template 1 and the second outer template 2. The function of the positioning holes 3 is to assist in adjusting the inner mold system B, the outer The spacing of the mold system A; the positioning hole 3 is a bolt hole with a diameter of 15mm.

The internal mold system B includes a pair of first inner formwork 17 arranged in parallel and a pair of second inner formwork 11 arranged in parallel. The ends of the first inner formwork 17 and the second inner formwork 11 are connected to make the inner mold system B It is a rectangular structure; on the inner wall of the second inner template 11, a second rib is provided along the length direction of the second inner template 11; the basic structure of the inner mold system B is similar to that of the outer mold system A, both of which are rectangular structures.

Specifically, the first inner template 17 includes a first split board 171, a second split board 172 and a third split board 173, wherein the structures and specifications of the first split board 171 and the third split board 173 are the same, and the second split board The width of 172 is less than the first split plate 171 (short 50mm, to facilitate longitudinal removal); The second fixing groove that cooperates with the first fixing groove; Between the first split plate 171, the second split plate 172 and the third split plate 173, realize the relative connection by the fixing groove; after connecting, on the second split plate 172 surface Detachably be provided with fixed steel plate 18 by assembling bolt 174, the length of fixed steel plate 18 is greater than the width of second split plate 172; Assembling the bolts 174 completes the assembly of the first inner template 17, as shown in FIG. 6 .

Fig. 7 is the exploded schematic view of the structure of the second inner formwork 11, same as the first inner formwork 17, the second inner formwork 11 is also composed of three split panels, and the connection mode between the three split panels is the same as that of the first inner template 17 is exactly the same, and will not be repeated here. The difference is that the second inner formwork 11 is longer than the first inner formwork 17, so the split plate is also longer than the first inner formwork 17. For this reason, two fixed steel plates 18 are provided for fixing.

The material of the first inner formwork 17 and the second inner formwork 11 is Q345 steel, which is conveniently designed as an easy-to-remove and assembleable mold. The material of the third inner formwork 15 is reinforced concrete, which has the function of bearing and forming during the construction stage. After pouring the slab concrete , together with post-cast concrete as a component of the model structure.

A suspension device is provided between the outer mold system A and the inner mold system B, and the function of the suspension device is to assist the installation of the outer mold system A and the inner mold system B; the suspension device includes a screw rod 14, and a pair of positioning pieces 5 are set on the screw rod 14 , on the side of each positioning piece 5 is provided with a slot 12, through the cooperation of the slot 12 on the positioning piece 5 with the first rib 9 and the second rib to realize the outer mold system A and the inner mold The connection of system B is shown in Figure 4. After the outer mold system A and the inner mold system B are installed, the suspension device can be removed.

The top of the inner mold system B is provided with a third inner formwork 15 through a supporting device, as shown in Figure 5 and Figure 6, the supporting device is a pressure bearing ear arranged on the sides of the first split plate 171 and the third split plate 173 The plate 175, the thickness of the pressure ear plate 175 is 8 mm, and it is in the shape of a right triangle, which bears the construction load transmitted by the platform pressure plate 16 and the third inner formwork 15; the platform pressure plate 16 is placed on the pressure ear plate 175, and the platform pressure The upper surface of the plate 16 is flush with the upper end surface of the first split plate 171 ; grooves 20 are equally spaced on the platform pressure bearing plate 16 . After the whole device is assembled, the two ends of the third inner formwork 15 are placed on the platform pressure bearing plate 16 placed on the two first inner formworks 17 of the intima system. The third inner formwork 15 is a reinforced concrete structure. The cold-drawn steel wires with greater rigidity inside the third inner formwork 15 have a diameter of 5 mm and a spacing of 50 mm. They are arranged in one direction along the short side of the concrete slab. The cold-drawn steel wires pass through the first The end face of the third inner formwork 15; the concrete used in the third inner formwork 15 is fine stone concrete with a strength grade of C30, which can be prefabricated according to the design size.

More preferably, a wall thickness adjustment device is provided between the inner mold system B and the outer mold system A, the wall thickness adjustment device includes a positioning nut 23, and one end of the positioning nut 23 is coaxially connected with a ferrule 22 with an external thread; Through the positioning nut 23 and the ferrule 22, an adjusting rod 21 is provided, and one end of the adjusting rod 21 has a section of external thread, and the diameter of the section provided with the external thread is larger than that of the adjusting rod 21 without external thread (larger than 4mm). ); the non-threaded end is fitted with a rubber layer. The end of the adjusting rod 21 provided with an external thread has an outer hexagonal structure, so that the adjusting rod 21 can be twisted. During use, earlier the ferrule 22 that has external thread is screwed in the locating hole 3 (threaded hole) on the first outer template 1, the second outer template 2, then adjusting rod 21 is passed through locating nut 23 and The ferrule 22 makes the end of the adjusting screw rod without external threads push against the outer wall of the inner mold system B, so that the distance between the inner membrane system and the outer mold system A can be adjusted by turning the positioning nut 23.

Further, a skeleton separating gauze 13 is detachably arranged between the outer mold system A and the inner mold system B. As shown in FIG. The ground is assembled; a gauze 133 is arranged inside the rectangular frame, and a skeleton steel sheet 132 is wrapped on the edge of the gauze 133; the inner wall of the outer mold system A and the outer wall of the inner mold system B are all along the direction perpendicular to the ground. The chute 6 is symmetrically arranged, and the skeleton separating gauze 13 is installed between the inner mold system B and the outer mold system A through the chute 6; the logarithm of the chute 6 can be set according to the needs, and each pair of chute 6 can be installed A skeleton separates the gauze 13; in this embodiment, two pairs of slide grooves 6 are provided in the length and width directions of the inner membrane system and the outer mold system A. In the binding stage of the model structural reinforcement 151, the horizontal reinforcement 151 is passed through the gauze 133 to form a vertical separation function between the prefabricated wall piece of the prefabricated shear wall structure and the post-casting part of the concrete.

When making a model, sometimes it is necessary to leave holes on the wall of the model according to the actual situation. In order to solve this problem, a hole forming device 19 is detachably arranged on the outer wall of the inner mold system B in this solution. The hole forming device 19 includes a rectangular structure composed of four sections of bar magnets 191, which are fixed to the inner mold system B by adsorption. On the required position on the outer wall; a reinforcing device 193 is arranged inside the rectangular structure, and the reinforcing device 193 includes a support rod arranged in a cross shape, and a supporting piece 194 is provided at the end of the supporting rod; after the reinforcing device 193 is installed inside the rectangular structure, The support piece 194 is in close contact with the bar magnet 191 to play a supporting role; the width of the bar magnet 191 is the same as the distance between the inner mold system B and the outer mold system A, and a rubber ring is sleeved outside the rectangular structure 192. The rubber ring 192 plays the role of protecting the bar magnet 191 to prevent concrete from sticking to the surface of the magnet. When performing infusion molding between the inner mold system B and the outer mold system A, the hole forming device 19 can keep this part of the structure from being poured all the time.

Instructions:

Assembling the first inner formwork 17 and the second inner formwork 11 by assembling; placing the platform pressure bearing plate 16 on the pressure bearing lug 175 of the first inner formwork 17, the inner side of the second inner formwork 11 and the platform bearing The ends of the pressing plate 16 are aligned, and the ends of the second inner formwork 11 are aligned with the inside of the first inner formwork 17 to complete the assembly of the inner mold system B. The hole forming device is sucked to the outside of the inner mold system B to form the boundary of the hole while supporting the reinforcement device 193 inside it.

Fix the second outer formwork 2 on the suspension device, initially position according to the wall thickness, install the first outer formwork 1, install the fixing bolts 10 at the end of the second outer formwork 2 on the web plate 8 at the end of the first outer formwork 1 Then install the gasket and the nut of the fixing bolt 10, insert the skeleton separating gauze 13 into the chute 6 between the outer mold system A and the inner mold system B correspondingly, and screw the nut to initially fix the outer mold System A.

Install the wall thickness adjusting device, screw the ferrule 22 into the positioning hole 3, then insert the adjusting rod 21 into the positioning nut 23 and the ferrule 22 to precisely adjust the position of the regulating rod 21, thereby fixing the thickness of the wall, and then Then tighten the nuts, and form the inner mold system B and the outer mold system A into a whole through the nuts and positioning rods.

Remove the suspension device, pour the concrete inside the wall, and after pouring to the height of the wall, install the third inner formwork 15, bind the steel bars 151 on the top of the slab, pour the concrete on the surface of the third inner formwork 15, and complete the formwork support and production work of the model structure.

Claims (7)

1. An integral mold of an assembled shear wall model structure, characterized in that it includes an outer mold system (A) and an inner mold system (B) arranged inside the outer mold system (A): The outer mold system (A) includes a pair of first outer templates (1) arranged in parallel and a pair of second outer templates (2) arranged in parallel, the first outer template (1) and the second outer template (2) ) ends are connected so that the outer mold system (A) has a rectangular structure; the outer wall of the second outer template (2) is provided with a first rib (9) along the length direction of the second outer template (2); The inner mold system (B) includes a pair of first inner templates (17) arranged in parallel and a pair of second inner templates (11) arranged in parallel, the first inner template (17) and the second inner template (11 ) ends are connected so that the inner mold system (B) has a rectangular structure; on the inner wall of the second inner mold (11), a second rib is provided along the length direction of the second inner mold (11); A suspension device is provided between the outer mold system (A) and the inner mold system (B). The suspension device includes a screw rod (14), and a pair of positioning pieces (5) are set on the screw rod (14). Each positioning piece ( 5) There are card slots (12) on the sides, and the outer mold system ( A) connection to the internal model system (B); A third inner template (15) is provided above the inner mold system (B) through a supporting device; The first outer template (1) includes a first plate body and a pair of webs (8) arranged on the same side edge of the first plate body and parallel to each other, and each web (8) is provided with A plurality of L-shaped notches (7), one end of the notch (7) pierces the side of the web (8); the second outer template (2) includes a second plate body, the second plate body along the width direction Fixing bolts (10) are distributed on the edge; The first inner template (17) includes a first split board (171), a second split board (172) and a third split board (173), wherein the first split board (171), the third split board (173 ) have the same structure and specifications, and the width of the second split board (172) is smaller than that of the first split board (171); the two sides of the second split board (172) are provided with first fixing grooves, and the first split board (171) 1. The edge of the second split plate (172) is provided with a second fixing groove matching the first fixing groove; on the surface of the second split plate (172), a fixed steel plate (18 ), the length of the fixed steel plate (18) is greater than the width of the second split plate (172). 2. The integral mold of the prefabricated shear wall model structure according to claim 1, characterized in that, the outer walls of the first outer formwork (1) and the second outer formwork (2) are arranged in rows Ribs (4) are provided, and each row of ribs (4) perpendicularly intersects each column of ribs (4); on the first outer formwork (1) and the second outer formwork (2), there are multiple penetrating first Positioning holes (3) of the outer formwork (1) and the second outer formwork (2). 3. The integral mold of the assembled shear wall model structure according to claim 1, characterized in that, the support device is a bearing arranged on the side of the first split plate (171) and the third split plate (173). Pressure ear plate (175), the platform pressure bearing plate (16) is placed on the pressure bearing ear plate (175), and the upper surface of the platform pressure bearing plate (16) is flush with the upper end surface of the first split plate (171); Grooves (20) are equidistantly distributed on the pressure bearing plate (16). 4. The integral mold of the prefabricated shear wall model structure according to claim 1, characterized in that, the third inner formwork (15) is a reinforced concrete structure, and the steel bars (151) inside the third inner formwork (15) ) is a cold-drawn steel wire, and the cold-drawn steel wire passes through the end face of the third inner template (15). 5. The integral mold of the prefabricated shear wall model structure according to claim 1, characterized in that, a wall thickness adjustment device is arranged between the inner mold system (B) and the outer mold system (A), and the wall thickness The adjustment device includes a positioning nut (23), and one end of the positioning nut (23) is coaxially connected with a ferrule (22) with an external thread; a regulating rod is arranged through the positioning nut (23) and the ferrule (22) (21), one end of the adjustment rod (21) has a section of external thread, and the section with external thread is larger in diameter than the part without external thread on the adjustment rod (21); the adjustment rod (21) is provided with one end of external thread The ends are in an outer hexagonal structure. 6. The integral mold of the prefabricated shear wall model structure according to claim 1, characterized in that, a skeleton separating gauze is detachably arranged between the outer mold system (A) and the inner mold system (B) (13), the skeleton separating the gauze (13) is a rectangular frame structure, which is composed of four rectangular frames (131) detachably assembled; a gauze (133) is arranged inside the rectangular frame, and the gauze (133) edge Wrapped with skeleton steel sheets (132); the inner wall of the outer mold system (A) and the outer wall of the inner mold system (B) are symmetrically provided with chutes (6) along the direction perpendicular to the ground, and the skeleton separates the gauze (13) Install between the inner mold system (B) and the outer mold system (A) through the chute (6). 7. The integral mold of the assembled shear wall model structure according to claim 1, characterized in that, the outer wall of the inner mold system (B) is detachably provided with a hole forming device (19), and the hole forming device (19) It includes a rectangular structure composed of four sections of bar magnets (191). A reinforcing device (193) is arranged inside the rectangular structure. The reinforcing device (193) includes a support rod arranged in a cross shape, and the end of the support rod is provided with Support sheet (194); after the reinforcement device (193) is installed inside the rectangular structure, the support sheet (194) is in close contact with the bar magnet (191) to play a supporting role; the width of the bar magnet (191) The distance between the inner mold system (B) and the outer mold system (A) is the same, and a rubber ring (192) is sleeved outside the rectangular structure.