JP6752420B1 - Formwork for square tubular concrete molded body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a dangerous work at a high place for an operation of purging an inner frame when a square tubular concrete molded body is removed from a mold. Eliminates the need for a place to place the inner frame. SOLUTION: An inner frame is divided into two, and the divided inner frames 2 and 3 on both sides are divided side plates 4 at both ends and a non-divided side plate 5 in between, and the plane shape is U-shaped. The split side plates at both ends are equipped with a pantograph-type jack 11 that makes the plane shape deformable into a V shape and deforms it in that way. The jack is configured such that the screw shaft 13 is arranged in the lateral direction and the end of the screw shaft is the operation unit 14, and the operator rotates the screw shaft 13 within the inner frame. The split inner frame allows linear movement to the center side of the inner frame with the split side plates at both ends in a V shape. At the time of demolding, the split inner frames on both sides are peeled off from the concrete molded body by deforming the split side plates at both ends into a V shape by operating the jack, and then the split inner frames on both sides are linearly moved and the non-split side plates are not split. Is peeled off from the concrete molded body, and the traces of movement of the divided inner frame are made into a space 36 for cleaning the outer surface of the divided inner frame. [Selection diagram] Fig. 1

Description

The present invention relates to a formwork for molding a square tubular concrete molded body.

In the formwork for a square cylinder-shaped concrete molded body such as a box culvert, the square cylinder-shaped outer frame and inner frame are arranged vertically. Concrete is filled between the inner and outer frames for curing. After the concrete has hardened, it is removed from the mold. To remove the mold, open the outer frame outward, squeeze the inner frame, and pull it out upward. Clean the inner frame by placing it on the outside of the outer frame.

Since the inner frame is squeezed when it is removed from the mold, the side plates on both sides facing the front and back or left and right are bent inward with the vertical line at the center crease. Between the bendable side plates, a pantograph-type jack that pulls the central portion of the side plates toward the center of the inner frame is installed.

In a pantograph type jack, a screw hole is penetrated through a moving body, and a screw shaft is screwed through the screw hole. The screw shaft is arranged vertically and the upper end is used as an operation unit. The moving body has one end of the link rotatably connected to each side. The links on both sides are rotatably connected to the center of the bendable side plate at the other end. The links on both sides are slightly inclined upward or downward from the lateral direction, respectively. When purging the inner frame, the operation part of the screw shaft is rotated by a rotary tool. Then, the moving body moves in the vertical direction due to the rotation of the screw shaft, the inclination of the links on both sides becomes large, and the side plates on both sides bend inward.

Special Publication No. 63-15858 Jikkenhei 2-68107

[Task]
When the mold is removed as described above, the operator climbs the mold and rotates the upper end of the screw shaft in order to operate the pantograph jack that purses the inner frame. It is dangerous to operate the pantograph jack and to squeeze the inner frame because it is a high-place work.

In addition, after purging the inner frame, it is lifted by a crane, pulled out, and carried to a place outside the outer frame. A place to put the inner frame is required. It is dangerous because the inner frame may fall over at the place where it is placed.

[Concept]
The square tube-shaped inner frame is divided into front and rear or left and right to form two divided inner frames. The two divided inner frames on both sides have a U-shaped plane shape with the divided side plates at both ends and the non-divided side plates in between. The split side plate has a crease at the end on the non-split side plate side, and can be bent and rotationally moved toward the center of the inner frame. The split side plates at both ends make the planar shape deformable into a V shape. Then, between the split side plates at both ends, a pantograph type jack that pulls the split side plates at both ends toward the center side of the inner frame to deform the plane shape into a C shape is installed.

Pantograph jacks have horizontal threads instead of vertical ones. The screw shaft is arranged in the lateral direction orthogonal to the non-divided side plate, and the end opposite to the non-divided side plate side is used as an operation unit. The operator is located inside the inner frame and rotates the operation unit of the screw shaft. No need for dangerous work at height.

Further, the divided inner frames on both sides can be linearly moved to the center side of the inner frame with the divided side plates at both ends having a V-shaped plane shape.

When the inner frame is removed from the mold, the divided inner frames on both sides rotate the operation unit of the pantograph type jack, and the divided side plates at both ends are rotated and moved to the center side of the inner frame. The split side plate peels off from the inner surface of the square tubular concrete molded body. Next, the divided inner frames on both sides are linearly moved and advanced toward the center side of the inner frame with the divided side plates at both ends having a V-shaped plane shape. The undivided side plate peels off from the inner surface of the square tubular concrete molded body. The trace of the movement of the divided inner frame becomes the space. The space allows for the insertion of cleaning tools. The outer surface of the divided inner frame and the surface for molding can be cleaned. There is no need for a place to put the inner frame.

In order to prevent the split side plates of the split inner frames on both sides from colliding with each other when the split inner frame is advanced, the angle at which the split side plates at both ends are rotated toward the center of the inner frame and the amount of rotational movement are within the split on one side. Increase with the frame and decrease with the divided inner frame on the other side. Set the value so that the split side plate of the split inner frame on one side and the split side plate of the split inner frame on the other side rub against each other.

Further, preferably, the divided inner frame is mounted on the rail with wheels in order to facilitate linear movement. The split side plate is provided with casters to facilitate rotational movement and linear movement. Further, a linear movement drive mechanism for pushing or pulling the divided inner frame by the rotation of the screw rod is provided.

1. In order to form a square tubular concrete molded body, concrete is filled between the outer frame and the inner frame and hardened, and when the mold is removed, the outer frame is opened outward and the inner frame is squeezed.
The square tube-shaped inner frame is divided into front and back or left and right to make two divided inner frames, and the two divided inner frames on both sides are divided side plates at both ends and the non-divided side plates in between, and the plane shape is U-shaped. West,
The split side plate has a crease at the end on the non-split side plate side, can be bent toward the center of the inner frame, and can be rotated and moved, and the split side plates at both ends can be transformed into a V shape.
Between the split side plates at both ends, a pantograph type jack that pulls the split side plates at both ends toward the center of the inner frame to transform the plane shape into a V shape is installed.
In the pantograph type jack, the screw shaft is arranged in the horizontal direction orthogonal to the non-split side plate, the screw shaft has the end opposite to the non-split side plate side as the operation part, and the operator is located inside the inner frame of the screw shaft. The operation unit is configured to rotate.
In addition, the split inner frames on both sides can be moved linearly toward the center of the inner frame with the split side plates at both ends in a V-shaped flat shape.
When the inner frame is removed from the mold, the split inner frames on both sides rotate the operation part of the pantograph type jack, rotate the split side plates at both ends toward the center of the inner frame, and move the split side plates to the square tubular concrete. After peeling from the inner surface of the molded body, the divided inner frames on both sides are linearly moved to the center side of the inner frame with the divided side plates at both ends in a C-shaped flat shape, respectively, to move the non-divided side plates. A formwork of a square-shaped concrete molded body characterized in that it is peeled off from the inner surface of the square-shaped concrete molded body, and the moving traces of the divided inner frame are used as a space for cleaning the outer surface of the divided inner frame.
2. In the formwork of the square tubular concrete molded body of 1 above,
The split inner frame is characterized in that it is mounted on a rail with wheels attached to facilitate linear movement.
3. In the formwork of the square tubular concrete molded body of 1 or 2 above,
The split side plate is characterized by having casters in order to facilitate rotational movement and linear movement.
4. In the formwork of the square tubular concrete molded body of 1, 2 or 3 above,
It is characterized by providing a linear movement drive mechanism that pushes and pulls the divided inner frame by the rotation of a screw rod.
5. In the formwork of the square tubular concrete molded product according to any one of 1 to 4 above.
For the split side plate, the end face on the opposite side to the non-split side plate is inclined to form an inclined end face.
The inclined end faces of the split side plates at both ends are directed outward in the first split inner frame on one side and inward in the second split inner frame on the other side.
When rotating the split side plates at both ends, the split side plate is first rotated and moved by the first split inner frame on one side, and then the split side plate is rotationally moved by the second split inner frame on the other side. To do.
6. In the formwork of the square tubular concrete molded product according to any one of 1 to 5 above.
The angle at which the divided side plate is rotated toward the center of the inner frame and the amount of rotational movement are increased in the first divided inner frame on one side and decreased in the second divided inner frame on the other side, and the divided inner frame is linearly moved. It is characterized in that the split side plate of the first split inner frame on one side and the split side plate of the second split inner frame on the other side have a value such that they rub against each other.

When demolding a square tubular concrete molded body, there is no need for dangerous work at height for the operation of purging the inner frame. There is no need for a place to put the inner frame.

FIG. 3 is a plan view of an inner frame of a formwork of a square tubular concrete molded product according to an embodiment of the present invention. Sectional view on the AA line of FIG. Front view of the first division inner frame on the rear side of the inner frame. The plan view which shows the state which the division side plate was rotationally moved in each of the division inner frames on both sides of the same inner frame. A plan view showing a state in which the divided inner frames on both sides are linearly moved. A plan view showing a state in which the same mold is filled with concrete. FIG. 6 is a cross-sectional view taken along the line BB of FIG. A plan view showing a state in which the outer frame is opened outward when the same mold is removed and the divided side plates are rotated and moved by the divided inner frames on both sides of the inner frame. A plan view showing a state in which the divided inner frames on both sides of the inner frame are linearly moved.

The formwork of the embodiment forms a square tubular concrete molded body C of a box culvert. The box culvert has an inner height, an inner width and an effective length of about 2 m each. The formwork is placed on the table 10 with the inner frame 1 and the outer frame 32 vertically.

The inner frame 1 has a square tubular shape as shown in FIG. 1. The square cylinder-shaped inner frame 1 is divided into front and rear (upper and lower in the plan view of FIG. 1) to form two divided inner frames 2 and 3. The front and rear divided inner frames 2 and 3 have a U-shaped plane shape with the divided side plates 4 at both left and right ends and the non-divided side plates 5 between them, respectively. The square cylinder-shaped inner frame 1 chamfers the four corners of the outer circumference.

As shown in FIGS. 1 to 3, the divided inner frames 2 and 3 are composed of a steel plate outer peripheral plate 6 and a reinforcing plate 7. The outer peripheral plate 6 is formed by bending a steel plate so that the planar shape is the outer peripheral shape of the divided inner frames 2 and 3 and the U shape, and the outer surface is a surface for molding. The reinforcing plate 7 is fixed by welding a steel plate to the inner surface of the outer peripheral plate 6, and is arranged in the vertical direction and the horizontal direction. The split side plate 4 of the split inner frame extends the reinforcing plate 7 in the lateral direction to the chamfered portion and includes the chamfered portion. The non-divided side plate 5 does not extend the lateral reinforcing plate 7 to the chamfered portion and does not include the chamfered portion.

As shown in FIG. 1, the split side plates 4 at both left and right ends are inclined at the end surface 8 on the opposite side to the non-divided side plate 5, and the angle between the inclined end surface 8 and the outer surface and the end surface inclination angle are obtuse angles larger than right angles. It has a small sharp angle. The end face inclination angle is an obtuse angle in the first divided inner frame 2 on the rear side and an acute angle in the second divided inner frame 3 on the front side. The sum of the obtuse angle and the acute angle is made two right angles. The inclined end faces 8 of the split side plates 4 at both ends are outward in the first split inner frame 2 on the rear side and inward in the second split inner frame 3 on the front side. The first and second divided inner frames 2 and 3 on both sides are in close contact with the inclined end faces 8 of the divided side plates 4 at both ends.

As shown in FIG. 4, the split inner frames 2 and 3 on both the front and rear sides do not fix the split side plates 4 on the left and right ends to the base 10, and the ends on the non-split side plate 5 side are creases. It can be bent toward the center and can be rotated. The split side plates 4 at both ends make the plane shape deformable into a C shape. Then, between the split side plates 4 at both ends, a pantograph type jack 11 is installed which pulls the split side plates 4 at both ends toward the center side of the inner frame to deform the plane shape into a C shape.

As shown in FIGS. 1 to 4, the pantograph type jack 11 penetrates the screw hole of the moving body 12 by screwing the screw shaft 13. The screw shaft 13 is arranged in the lateral direction and the front-rear direction orthogonal to the non-divided side plate 5, and the arrangement height is set to the middle of the heights of the divided inner frames 2 and 3. The rear end of the screw shaft 13 and the end on the non-split side plate side are rotatably and cannot be pulled out from the non-split side plate 5. The front end of the screw shaft 13 and the end opposite to the non-split side plate 5 side are used as the operation unit 14. The operator is located inside the inner frame 1 and rotates the operation unit 14 of the screw shaft with a rotary tool.

In the moving body 12, one end of the link 15 is rotatably connected to both the left and right sides. The other ends of the left and right links 15 are rotatably connected to the left and right split side plates 4. The links 15 on both sides are slightly inclined from the lateral direction and the left-right direction to the front side or the rear side, respectively.

When the split side plates 4 at both ends of the split inner frame are deformed into a C-shaped plane shape, the operation portion 14 of the screw shaft is rotated. Then, as shown in FIG. 4, the moving body 12 moves in the front-rear direction by the rotation of the screw shaft 13, the inclination of the links 15 on both sides becomes large, and the split side plates 4 at both ends are pulled toward the center side of the inner frame and bent. , Rotate and move. First, the split side plate 4 is rotationally moved by the first split inner frame 2 on the rear side. Next, the split side plate 4 is rotationally moved by the second split inner frame 3 on the front side.

Further, the split inner frames 2 and 3 on both the front and rear sides are not fixed to the base 10, and as shown in FIG. 5, the split inner frames 4 at both ends are formed into a V-shaped plane shape at the center of the inner frame. It can move linearly to the side and can move back and forth. When the rear side first division inner frame 2 is pushed or pulled toward the front side second division inner frame 3, the inner frame 2 moves forward toward the center of the inner frame. When the second divided inner frame 3 on the front side is pushed or pulled toward the first divided inner frame 2 side on the rear side, it advances toward the center side of the inner frame.

In order to prevent the split side plates 4 of the split inner frames 2 and 3 on both sides from colliding with each other when the split inner frame is advanced, the angle at which the split side plates 4 are rotated toward the center of the inner frame and the amount of rotational movement are set on the rear side. In the first division inner frame 2 of the above, it is increased, and in the second division inner frame 3 on the front side, it is decreased. The value is set so that the split side plate 4 of the first split inner frame 2 on the rear side and the split side plate 4 of the second split inner frame 3 on the front side rub against each other.

A mechanism is provided to facilitate the linear movement of the divided inner frames 2 and 3 and the rotational movement of the divided side plate 4. The non-divided side plate 5 has wheels 21 attached under each of the two left and right positions. The platform 10 has rails 22 laid on the left and right two locations along the linear movement direction and the front-rear direction, respectively. The left and right wheels 21 are mounted on the left and right rails 22, respectively. The split side plate 4 has casters 23 attached to the side opposite to the non-split side plate 5 and below the end on the inclined end surface 8 side. The wheels 21, rails 22, and casters 23 facilitate linear movement of the divided inner frames 2 and 3. The caster 23 facilitates rotational movement of the split side plate 4.

Further, a linear movement drive mechanism for pushing or pulling the divided inner frames 2 and 3 by the rotation of the screw rod 27 is provided. The fixture 26 is fixed on the table 10 and arranged at a position inside the divided inner frames 2 and 3. The fixture 26 is L-shaped, and a screw hole is penetrated in the vertical piece portion in the front-rear direction, and a screw rod 27 is screwed into the screw hole to penetrate in the front-rear direction. The screw rod 27 is rotatably bearing the end of the non-split side plate 5 on the non-split side plate 5 so that it cannot be pulled out. The end of the screw rod 27 opposite to the non-split side plate 5 side is used as the operation unit 28. The operator is located inside the inner frame 1 and rotates the operation portion 28 of the screw rod with a rotary tool. The fixture 26 has a vertical piece portion as a forward stop for the divided inner frames 2 and 3. When the forward distance of the divided inner frames 2 and 3 reaches a predetermined amount, the non-divided side plate 5 of the divided inner frame is configured to hit the vertical piece portion of the fixture 26.

In the formwork of the embodiment, when the square tubular concrete molded body of the box culvert is formed, the inner frame 1, the lower frame 31 and the outer frame 32 are concentrically formed on the table 10 as shown in FIGS. 6 and 7. Place in. The lower frame 31 is sandwiched between the inner frame 1 and the outer frame 32. The outer frame 32 fixes the upper frame 33 to the upper end of the inner peripheral surface. The concrete C is thrown in through the gap between the upper end of the outer frame 33 and the upper end of the inner frame 1 to fill the space between the inner frame 1 and the outer frame 32 and the lower frame 31 and the upper frame 33. After the concrete C is cured and hardened, it is demolded.

Demolding opens the outer frame 32 outward as shown in FIG. The outer frame 32 retracts four side plates with upper frames 33 on the front, back, left, and right. Each side plate with the upper frame 33 is peeled off from the outer surface of the concrete molded body C of the box culvert.

Further, in the inner frame 1, first, in the first divided inner frame 2 on the rear side, the operation unit 14 of the pantograph type jack is rotated, and the divided side plates 4 at both ends are rotated and moved to the center side of the inner frame. Each of the divided side plates 4 is peeled off from the inner surface of the concrete molded body C. Next, in the second divided inner frame 3 on the front side, the operation unit 14 of the pantograph type jack is rotated to move the divided side plates 4 at both ends slightly toward the center of the inner frame. Each of the divided side plates 4 is peeled off from the inner surface of the concrete molded body C.

After that, as shown in FIG. 9, the first and second divided inner frames 2 and 3 on both sides of the linear movement drive mechanism are in a state where the divided side plates 4 at both ends are shaped like a V-shape. The operation unit 28 is rotated to move it forward toward the center of the inner frame. Each non-divided side plate 5 is peeled off from the inner surface of the concrete molded body C.

The traces of movement of the divided inner frames 2 and 3 become the space 36. The space 36 allows a cleaning tool to be inserted. It becomes a cleaning space for cleaning the outer surfaces of the divided inner frames 2 and 3 and the molding surface.

[Modification example]
The present invention is not limited to the above embodiments. The following modifications are exemplified.
1. In the above embodiment, the inner frame 1 has a square tubular shape, but has another polygonal tubular shape.
2. In the above embodiment, the inner frame 1 chamfers the outer peripheral corners and corners, but does not chamfer.
3. In the above embodiment, the inner frame 1 is divided into two parts in the front-rear direction to form the front side and the rear side divided inner frames 2 and 3, but the inner frame 1 is divided into two parts in the left and right sides to form the left and right divided inner frames.
4. In the above embodiment, the box culvert formed by the mold has an inner height, an inner width and an effective length of about 2 m, respectively, but it is made larger or smaller than that.
5. In the above embodiment, the square tubular concrete molded body C to be molded by the formwork is a box culvert, but it may be an underdrain or the like.

1 Inner frame 2, 3 Divided inner frame 2 1st divided inner frame 3 2nd divided inner frame 4 Divided side plate 5 Non-divided side plate 6 Outer peripheral plate 7 Reinforcing plate 8 End face of divided side plate, inclined end face 10 units 11 Pantograph type jack 12 Movement Body 13 Screw shaft 14 Operation unit 15 Link 21 Wheel 22 Rail 23 Caster 26 Fixture 27 Screw rod 28 Operation unit 31 Lower frame 32 Outer frame 33 Upper frame 36 Space, cleaning space C Concrete, concrete molded body

Claims (6)

In order to form a square tubular concrete molded body, concrete is filled between the outer frame and the inner frame and hardened, and when the mold is removed, the outer frame is opened outward and the inner frame is squeezed.
The square tube-shaped inner frame is divided into front and back or left and right to make two divided inner frames, and the two divided inner frames on both sides are divided side plates at both ends and the non-divided side plates in between, and the plane shape is U-shaped. West,
The split side plate has a crease at the end on the non-split side plate side, can be bent toward the center of the inner frame, and can be rotated and moved, and the split side plates at both ends can be transformed into a V shape.
Between the split side plates at both ends, a pantograph type jack that pulls the split side plates at both ends toward the center of the inner frame to transform the plane shape into a V shape is installed.
In the pantograph type jack, the screw shaft is arranged in the horizontal direction orthogonal to the non-split side plate, the screw shaft has the end opposite to the non-split side plate side as the operation part, and the operator is located inside the inner frame of the screw shaft. The operation unit is configured to rotate.
In addition, the split inner frames on both sides can be moved linearly toward the center of the inner frame with the split side plates at both ends in a V-shaped flat shape.
When the inner frame is removed from the mold, the split inner frames on both sides rotate the operation part of the pantograph type jack, rotate the split side plates at both ends toward the center of the inner frame, and move the split side plates to the square tubular concrete. After peeling from the inner surface of the molded body, the divided inner frames on both sides are linearly moved to the center side of the inner frame with the divided side plates at both ends in a C-shaped flat shape, respectively, to move the non-divided side plates. A formwork of a square-shaped concrete molded body characterized in that it is peeled off from the inner surface of the square-shaped concrete molded body, and the moving traces of the divided inner frame are used as a space for cleaning the outer surface of the divided inner frame. The formwork of a square tubular concrete molded body according to claim 1, wherein the divided inner frame is configured to be mounted on a rail with wheels attached to facilitate linear movement. The formwork of a square tubular concrete molded product according to claim 1 or 2, wherein the split side plate is provided with casters in order to facilitate rotational movement and linear movement. The formwork of a square tubular concrete molded body according to claim 1, 2 or 3, wherein a linear movement drive mechanism for pushing or pulling the divided inner frame by rotation of a screw rod is provided. For the split side plate, the end face on the opposite side to the non-split side plate is inclined to form an inclined end face.
The inclined end faces of the split side plates at both ends are directed outward in the first split inner frame on one side and inward in the second split inner frame on the other side.
When rotating the split side plates at both ends, the split side plate is first rotated and moved by the first split inner frame on one side, and then the split side plate is rotationally moved by the second split inner frame on the other side. The formwork of the square tubular concrete molded body according to any one of claims 1 to 4. The angle at which the divided side plate is rotated toward the center of the inner frame and the amount of rotational movement are increased in the first divided inner frame on one side and decreased in the second divided inner frame on the other side, and the divided inner frame is linearly moved. The invention according to any one of claims 1 to 5, wherein the split side plate of the first split inner frame on one side and the split side plate of the second split inner frame on the other side have a value such that they rub against each other. Formwork for square tubular concrete molded body.

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