A pull-out inner formwork for prefabricated highway concrete slab beams

Abstract

The present application discloses a new type of pull-out inner mold for prefabricated highway concrete slab beam, including four first rotating shafts, on which an upper supporting formwork and a lower supporting formwork are rotatably connected, and two first rotating shafts form a group. The present invention divides the inner mold into three parts. When demoulding, the middle part is first separated, and the roller falls on the slide rail after the second rotating shaft is passively rotated. At the same time, the lower formwork is separated from the bottom concrete due to the principle of being pried by a lever. After the middle part is demoulded, a huge space in the middle is freed up, creating conditions for the rotation, folding and removal of the formworks on both sides. Regardless of the size of the block, the processability is good, and it is convenient for processing, manufacturing and construction. The axis of the folding of the two side parts is designed to be an inner and outer line, that is, the axis of the large diameter part and the axis of the port part are designed to be the same axis, which overcomes the structural defects and inconvenience of operation caused by different axes inside and outside, so that the inner and outer rotations of the two side parts are consistent, and the folding is smooth and the demoulding is fast.

Description

Technical Field

[0001] The invention relates to the technical field of road engineering, in particular to a pull-out inner formwork for prefabricated highway concrete slab beams. Background Art

[0002] Generally, small and medium-sized highway bridges adopt plate-beam structure. In the prefabrication of small and medium-sized plate-beams in beam yard, the demoulding problem of inner mold is more troublesome, and there are many difficulties. It is often difficult to demould, and even worse, it will cause the beam body to be scrapped because it cannot be demoulded. Even if it is barely demoulded, the inner mold is damaged and needs to be remade or repaired. At the same time, it also causes the progress of prefabricated beam engineering to be suspended, which wastes and delays the construction period. Due to the small size of the hollow space in the beam body, it is very difficult to manually climb in to clean up the fault. This problem has become one of the major obstacles to prefabricated beams. The original pulling inner mold is to divide the inner mold into two halves, one large and one small. When demoulding, the small half is first folded and then pulled out, and the other large half is folded again and then demoulded. The two halves are mainly supported by the top rods on both sides when the mold is erected to withstand the upper pressure. When demolding, the steel wire rope set on the top rod is pulled to pull the top rod down and fold it down. A hinge-shaped rotating shaft is provided in the middle of each half. Due to the upper structure Without the top force of the top rod and the overlapping and pulling force of the wire rope, it can be folded together up and down, reducing the volume. Theoretically, it can be demolded barely, but due to many technical reasons, the ideal effect is often not achieved. The second point is that the internal structure of the top rod, pulley, wire rope, pull rod and other structures are numerous and complex, and there are many interference factors, which makes the construction operation cumbersome and will fail if you are not careful. The third point is that due to improper setting of the rotating shaft (folding hinge), there is a gap when the mold is erected, and two patch plates of about 0.3m×2m need to be added. After the mold is erected, the patch plates need to be installed separately. The two patch plates must be removed first when demolding, which is more cumbersome and has poor integrity. When demolding, the winch is mainly used to drag the wire rope. Due to various reasons such as scraping, collision, top and carding of the inner cavity, the 18mm diameter wire rope is often broken or the welding parts of the inner mold are cracked and broken. The above problems have existed for a long time.

[0003] Prior to this, there have been many designs of pull-out inner molds for the production of inner molds for this type of slab beams. However, the inner cavity of the beam body is too small, and due to the large mid-span space and small outlets at both ends, demoulding is still relatively unsatisfactory. During demoulding, either the inner mold is damaged or the beam body is damaged, resulting in serious consequences. A common result is that the inner mold is also pulled out, and the structure of the top slab concrete that has just been initially set is also damaged. The reason is that the inside is large and the outlet is small. Although the inner mold is divided into two halves, rolled up separately, and pulled out in batches, it is always damaged by various reasons such as scraping, bumping, pushing, and getting stuck, leaving hidden dangers to the project quality. For this reason, we proposed a pull-out inner mold for prefabricated highway concrete slab beams to solve the above problems. Summary of the invention

[0004] The present application provides a pull-out inner mold for prefabricated highway concrete slab beams, which solves the problem that the traditional inner mold structure is difficult to demould and the beam body is damaged due to various reasons such as scraping, collision, top and jamming.

[0005] The present application provides a pull-out inner formwork for a prefabricated highway concrete slab beam, comprising four first rotating shafts, on which an upper supporting formwork and a lower supporting formwork are rotatably connected, two of the first rotating shafts form a group, and the two upper supporting formworks of the same group of the first rotating shafts form a group, and the two lower supporting formworks of the same group of the first rotating shafts form a group, and a limiting device is provided between the two groups of the upper supporting formworks and the lower supporting formworks, a slide rail is fixed to the top side of the upper supporting formworks and the bottom side of the lower supporting formworks, the two slide rails on the same group of the upper supporting formworks form a group, and an upper formwork is provided on the slide rail, and the two slide rails on the same group of the lower supporting formworks form a group, A lower template is provided between the two slide rails, both sides of the upper template and the lower template are inclined, the opposite sides of the two slide rails of the same group are inclined, one upper template and one lower template on the same side are a group, and a plurality of top plates are provided between the upper template and the lower template, both ends of the top plates are fixed with second rotating shafts, one of the second rotating shafts is installed on the lower template, and the other second rotating shaft is installed on the upper template, the top plate is perpendicular to the lower template and then rotates unidirectionally, both ends of the second rotating shaft installed on the lower template are installed with rollers, and the line connecting the roller and the center of the second rotating shaft is arranged to intersect the top plate.

[0006] Preferably, the upper supporting formwork and the lower supporting formwork are arranged in multiple sections, the upper supporting formwork and the lower supporting formwork are divided into a small diameter section, a transition section and a large diameter section, and the multiple sections are fixedly connected.

[0007] Preferably, a handle is fixed to one end of the upper template.

[0008] Preferably, the limiting device includes a limiting block arranged at one end of one group of the upper support template and the lower support template and a limiting groove arranged at one end of another group of the upper support template and the lower support template, and the limiting groove corresponds to the limiting block.

[0009] Preferably, the slide rail is made of angle steel.

[0010] Preferably, the two sides of the upper template and the lower template are arranged at 45 degrees.

[0011] It can be seen from the above technical scheme that the present application provides a pull-out inner mold for prefabricated highway concrete slab beams. The inner mold is divided into two sections. The two sections have completely identical structures and are easily aligned through a limiting device, which increases the accuracy and stability after docking and makes it less likely to be misplaced. Each section is divided into a middle part and two side parts. The middle part is symmetrical up and down except for the rollers, and the two side parts are symmetrical left and right. The middle part is an upper template, a lower template, a second rotating shaft, rollers and a top plate. The two side parts are divided into a first rotating shaft, an upper supporting template, a lower supporting template and a slide rail. The middle part is provided with a plurality of top plates that can rotate in one direction. The upper template is rotated to be perpendicular to the top plate and cannot be rotated, but can only rotate to one side. After the installation is completed, the upper template extends to the opening on one side of the beam plate. When removing the mold, pull the upper template. The handle at one end of the template drives the top plate to rotate toward the side of the slab beam opening, and the upper template is demoulded. At the same time, since the lower second rotating shaft is driven to rotate together, a roller is arranged on the second rotating shaft at the lower end. The roller leaves the slide rail when the slab beam is poured. During demoulding, the lower second rotating shaft is passively rotated about 85° and then the roller falls on the slide rail. At the same time, the lower template is pried by the lever, so that its lower template is separated from the bottom concrete, which makes it easier to pull the middle part out of the inner mold. After demoulding, the middle part is pulled out along the slide rail. After the middle part is demoulded, a huge space in the middle is vacated, creating conditions for the rotation, folding and removal of the templates on both sides. The upper supporting template on one side is rotated, and the upper supporting template is rotated and folded to pull out one side, and the other side is pulled out in the same way.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. By dividing the inner mold into three parts, there is no complicated scattered parts in the middle of the inner mold, no push rods, pulleys, wire ropes, blocks, bolts, and no size distinction, which has good processability and is convenient for processing, manufacturing and construction. The two supplementary plates in the upper and lower parts are eliminated, and the three parts are complete structural designs, making the installation of the vertical mold simple and quick. After the middle part is demoulded, a huge space in the middle is freed up to create conditions for the rotation, folding and removal of the templates on both sides;

[0014] 2. The upper formwork, lower formwork, rotating shaft, top plate and roller are designed to withstand the pressure from the upper concrete. The top plate can only rotate along one side, which is convenient for installation and demoulding. The roller is away from the slide rail when the slab beam is poured. When demoulding, the second rotating shaft is passively rotated about 85° and then the roller falls on the slide rail. At the same time, the lower formwork is separated from the bottom concrete due to the principle of being pried by the lever, which makes it easier to pull the middle part out of the inner mold;

[0015] 3. By tilting the two slide rails of the same group at opposite sides, the upper and lower templates can be precisely fitted during installation, achieving a better sealing effect and forming a complete inner cavity;

[0016] 4. By setting the first rotating shaft, the rotating shafts at the mid-span and the outlet are on the same axis, which solves the problem that the original design only has a rotating shaft at the mid-span, but no rotating shaft at the outlet reduced diameter, resulting in a large gap when opening and closing. No need for filling plates, simple operation, and smooth and quick demolding inside and outside.

[0017] In summary, the present invention divides the inner mold into three parts. When demolding, the middle part is separated first, and the second rotating shaft is passively rotated about 85° before the roller falls on the slide rail. At the same time, the lower template is separated from the bottom concrete due to the principle of being pried by the lever. After the middle part is demolded, a huge space in the middle is vacated, creating conditions for the rotation, folding and removal of the templates on both sides. Regardless of size, the processability is good, and it is convenient for processing, manufacturing and construction. In addition, the axis of the folding of the two side parts is designed to be an inner and outer line, that is, the axis of the large diameter part and the axis of the port part are designed to be the same axis, which overcomes the structural defects and operational inconvenience caused by different axes inside and outside, so that the inner and outer rotations of the two side parts are consistent, and the folding is smooth and the demolding is quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation cases. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 A schematic diagram of the installation structure of a pull-out inner formwork for a prefabricated highway concrete slab beam proposed by the present invention;

[0020] Figure 2 This is a schematic diagram of the installation structure of both sides of a pull-out inner mold of a prefabricated highway concrete slab beam proposed by the present invention;

[0021] Figure 3 A schematic diagram of the middle part support structure of a pull-out inner formwork for a prefabricated highway concrete slab beam proposed by the present invention;

[0022] Figure 4 A schematic diagram of the disassembly structure of the middle part of a pull-out inner mold of a prefabricated highway concrete slab beam proposed by the present invention;

[0023] Figure 5 A schematic diagram of the rotating structure of both sides of a pull-out inner mold of a prefabricated highway concrete slab beam proposed by the present invention;

[0024] Figure 6 A schematic diagram of the disassembly structure of both sides of a pull-out inner mold of a prefabricated highway concrete slab beam proposed by the present invention;

[0025] Figure 7A schematic diagram of a top plate support structure of a pull-out inner formwork for a prefabricated highway concrete slab beam proposed by the present invention;

[0026] Figure 8 A schematic diagram of the supporting structure of the middle part of the small warp end of a pull-out inner formwork of a prefabricated highway concrete slab beam proposed by the present invention;

[0027] Fig. 9 A schematic diagram of the demoulding state of the middle part of the small diameter section of a pull-out inner mold for a prefabricated highway concrete slab beam proposed by the present invention;

[0028] Fig.10 The present invention provides a schematic diagram of the structure of both sides of the small diameter section of a pull-out inner formwork for a prefabricated highway concrete slab beam.

[0029] In the figure: 1 first rotating shaft, 2 upper supporting template, 3 lower supporting template, 4 slide rail, 5 upper template, 6 lower template, 7 second rotating shaft, 8 handle, 9 roller, 10 top plate. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0031] See also Figure 1-10A pull-out inner mold for a prefabricated highway concrete slab beam comprises four first rotating shafts 1, an upper supporting formwork 2 and a lower supporting formwork 3 are rotatably connected to the first rotating shaft 1, the upper supporting formwork 2 and the lower supporting formwork 3 are in an up-down relationship, the upper supporting formwork 2 and the lower supporting formwork 3 together constitute an inner mold on one side, two first rotating shafts 1 form a group, the beam length is divided into two symmetrical sections from the center, the two first rotating shafts 1 in the same group form a section of inner mold structure, each section is divided into a middle part and two side parts, the two first rotating shafts 1 in the same group are structures of the two side parts respectively, the upper supporting formwork 2 and the lower supporting formwork 3 on the same first rotating shaft 1 form a side inner mold structure, and the two upper supporting formworks 2 of the same group of first rotating shafts 1 form a group, the two lower supporting formworks 3 of the same group of first rotating shafts 1 form a group, and the two A limiting device is provided between the upper supporting formwork 2 and the lower supporting formwork 3 of the group, and the limiting device includes a limiting block arranged at one end of one group of the upper supporting formwork 2 and the lower supporting formwork 3 and a limiting groove at one end of the other group of the upper supporting formwork 2 and the lower supporting formwork 3. The limiting groove and the limiting block correspond to each other, and alignment is convenient through the limiting device, which increases the accuracy and stability after docking and makes it less likely to be misaligned. A slide rail 4 is fixed to the top side of the upper supporting formwork 2 and the bottom side of the lower supporting formwork 3. The two slide rails 4 on the same group of upper supporting formworks 2 form a group, and an upper template 5 is provided on the slide rail 4, which is located between the two upper supporting formworks 2. The two slide rails 4 on the same group of lower supporting formworks 3 form a group, and a lower template 6 is provided between the two slide rails 4, which is located between the two lower supporting formworks 3, so that A cavity is formed, both sides of the upper template 5 and the lower template 6 are inclined, and both sides of the upper template 5 and the lower template 6 are set at 45 degrees. The opposite sides of the two slide rails 4 of the same group are inclined, and the slide rail 4 is made of angle steel. The angle steel can be used as a slide rail 4 and can provide a 45-degree slope. The inclined surface of the slide rail 4 is also set at 45 degrees, which is convenient for the installation, positioning and sealing of the upper template 5 and the lower template 6 to form a complete inner cavity. An upper template 5 and a lower template 6 on the same side are a group, and a plurality of top plates 10 are arranged between the upper template 5 and the lower template 6. The function of the top plate 10 is to withstand the pressure from the upper concrete. A handle 8 is fixed at one end of the upper template 5. When removing the mold, pull the handle 8 at one end of the upper template 5. The template 5 drives the top plate 10 to rotate toward the side of the plate beam opening. Second rotating shafts 7 are fixed at both ends of the top plate 10, one of the second rotating shafts 7 is installed on the lower template 6, and the other second rotating shaft 7 is installed on the upper template 5. The top plate 10 is perpendicular to the lower template 6 and then rotates in one direction. The top plate 10 can only rotate to a vertical position. When demoulding, the upper template 5 drives the top plate 10 to rotate toward the side of the plate beam opening. The upper template 5 is demoulded, and rollers 9 are installed at both ends of the second rotating shaft 7 installed on the lower template 6. The line connecting the center of the roller 9 and the second rotating shaft 7 is arranged crosswise with the top plate 10. The roller 9 leaves the slide rail 4 when the plate beam is cast. When demoulding, the lower second rotating shaft 7 is passively rotated about 85° and then the roller 9 falls on the slide rail 4. At the same time, due to the principle of being pried by a lever, the lower template 6The lower formwork 6 is separated from the bottom concrete by 5mm, making it easier to pull the middle part out of the inner formwork.

[0032] In the present invention, the upper supporting template 2 and the lower supporting template 3 are arranged in multiple sections, and the upper supporting template 2 and the lower supporting template 3 are divided into a small diameter section, a transition section and a large diameter section, and the multiple sections are fixedly connected, so that a space with a large inner diameter in the middle and very small outlets at both ends can be formed inside. The inner mold can be folded, and after the middle part is demoulded, a huge space in the middle is vacated. The templates on both sides can be rotated and folded to complete the demoulding, regardless of size, with good processability, convenient processing and construction, and the rotating shafts of the mid-span part and the outlet part are on the same axis, which solves the problem that the original design only has a rotating shaft in the mid-span part, and there is no rotating shaft in the outlet reduced diameter part, resulting in a large gap when opening and closing. No plate filling is required, which simplifies the operation, and the internal and external demoulding is smooth and fast.

[0033] It can be seen from the above technical scheme that when in use, the inner mold is divided into two sections, the structures of the two sections are completely consistent, and the limit device is used for easy alignment, which increases the accuracy and stability after docking and makes it not easy to misalign. Each section is divided into a middle part and two side parts. The middle part is symmetrical up and down except for the roller 9, and the two side parts are symmetrical left and right. The middle part is an upper template 5, a lower template 6, a second rotating shaft, rollers 9 and a top plate 10. The two side parts are divided into a first rotating shaft 1, an upper supporting template 2, a lower supporting template 3 and a slide rail 4, wherein a plurality of unidirectionally rotatable top plates 10 are arranged in the middle part. The upper template 5 is rotated to be perpendicular to the top plate 10 and cannot be rotated, and can only be rotated to one side. After the installation is completed, the upper template 5 extends to the opening on one side of the beam plate. When removing the mold, pull the handle 8 at one end of the upper template 5. The plate 5 drives the top plate 10 to rotate toward the side of the plate beam opening, and the upper formwork 5 is demoulded. At the same time, since the lower second rotating shaft 7 is driven to rotate together, a roller 9 is arranged on the second rotating shaft 7 at the lower end. The roller 9 leaves the slide rail 4 when the plate beam is cast. During demoulding, the lower second rotating shaft 7 is passively rotated about 85° and then the roller 9 falls on the slide rail 4. At the same time, the lower formwork 6 is pried by the lever, so that the lower formwork 6 is separated from the bottom concrete by 5mm, which makes it easier to pull the middle part out of the inner mold. After the demoulding is completed, the middle part is pulled out along the slide rail 4. After the middle part is demoulded, a huge space in the middle is vacated, creating conditions for the rotation, folding and ejection of the formworks on both sides. The upper supporting formwork 2 on one side is rotated, and the upper supporting formwork 2 is rotated and folded to pull out one side, and the other side is pulled out in the same way.

[0034] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope of the present application is indicated by the claims.

[0035] It should be understood that the present application is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The above-described embodiments of the present application do not constitute a limitation on the scope of protection of the present application.

Claims

1. A pull-out inner mold for a prefabricated highway concrete slab beam, comprising four first rotating shafts (1), characterized in that: An upper support template (2) and a lower support template (3) are rotatably connected to the first rotating shaft (1); the two first rotating shafts (1) form a group, and the two upper support templates (2) of the same group of the first rotating shafts (1) form a group, and the two lower support templates (3) of the same group of the first rotating shafts (1) form a group; a limiting device is provided between the two groups of the upper support templates (2) and the lower support templates (3); a slide rail (4) is fixed to the top side of the upper support template (2) and the bottom side of the lower support template (3); the two slide rails (4) on the same group of the upper support templates (2) form a group, and an upper template (5) is provided on the slide rail (4); the two slide rails (4) on the same group of the lower support templates (3) form a group, and a lower template (6) is provided between the two slide rails (4); the upper template (5) and both sides of the lower template (6) are inclined, and the opposite sides of the two slide rails (4) of the same group are inclined. One of the upper templates (5) and one of the lower templates (6) on the same side form a group, and a plurality of top plates (10) are arranged between the upper template (5) and the lower template (6). Second rotating shafts (7) are fixed at both ends of the top plates (10), one of the second rotating shafts (7) is installed on the lower template (6), and the other second rotating shaft (7) is installed on the upper template (5). The top plates (10) are perpendicular to the lower template (6) and then rotate in one direction. Rollers (9) are installed at both ends of the second rotating shaft (7) installed on the lower template (6), and the line connecting the center of the roller (9) and the second rotating shaft (7) is arranged to cross the top plates (10); The upper support formwork (2) and the lower support formwork (3) are arranged in multiple sections, the upper support formwork (2) and the lower support formwork (3) are divided into a small diameter section, a transition section and a large diameter section, and the multiple sections are fixedly connected; The limiting device comprises a limiting block arranged at one end of one set of the upper supporting template (2) and the lower supporting template (3) and a limiting groove arranged at one end of another set of the upper supporting template (2) and the lower supporting template (3), wherein the limiting groove corresponds to the limiting block; The upper template (5) and the lower template (6) are arranged at 45 degrees on both sides.

2. A pull-out inner formwork for prefabricated highway concrete slab beams according to claim 1, characterized in that: A handle (8) is fixed to one end of the upper template (5).

3. The pull-out inner mold for prefabricated highway concrete slab beam according to claim 1, characterized in that: The slide rail (4) is made of angle steel.

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