JP3072597B1 - Formwork for tubular concrete products - Google Patents

Abstract

An object of the present invention is to enable a cylindrical concrete product to be manufactured by an ordinary concrete product manufacturing line, thereby improving work efficiency. A form body is rotatably mounted on a base with respect to a vertical axis. The mold body has an outer mold formed in a substantially box shape and a cylindrical inner mold disposed inside the outer mold in the length direction over the entire length. The inner mold has a drawing mechanism for reducing the diameter at the time of demolding, and at the time of demolding, the form body is pulled out of the concrete product while being rotated at an appropriate angle on the base.
Since the inner mold is pulled out with the mold body rotated,
Demolding is possible even in a normal production line in which a mold flows continuously.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for forming a tubular concrete product such as a culvert-side ditch block.

[0002]

2. Description of the Related Art Conventionally, as a formwork for molding a cylindrical concrete product such as a culvert-side ditch block,
An outer mold formed in a substantially box-like shape with a bottom plate portion, a pair of side plates and a pair of side plates that stand upright around the bottom plate portion, and are disposed inside the outer mold along the entire length in the length direction. A mold having a cylindrical inner mold is known. The inner mold of this type of mold has a drawing mechanism for reducing the diameter at the time of demolding. When concrete is put into the formwork and the concrete product is released after curing, the outer die is knocked down, the side plate and the end plate are knocked down, the inner die is squeezed by the drawing mechanism to reduce the diameter, and the concrete product is removed. The inner mold is pulled out from one end of the wife side and the inner mold is removed. Thereafter, the concrete is taken out of the outer bottom plate using a crane or the like.

[0003]

As described above, since this type of formwork has to be pulled out in the longitudinal direction of the concrete product when it is removed from the mold, it is necessary to manufacture the mold using an ordinary concrete product production line. Can not.
Therefore, the work efficiency has been extremely poor because the form must be moved by a forklift or the like in each step (demolding, cleaning / oiling, form assembling, reinforcing bar arrangement, concrete input, etc.). Also, fix the formwork without moving it,
Each process can be performed at that location, but in that case, an extremely large space is required, and the space of the factory is not effectively used, and the productivity of the entire factory is reduced.

The present invention relates to a concrete product of this kind,
It can be manufactured by a normal concrete product manufacturing line, and the work efficiency can be greatly improved.

[0005]

SUMMARY OF THE INVENTION The present invention comprises a base and a mold body mounted on the base so as to be rotatable with respect to a vertical axis, the form body having a bottom plate and the bottom plate. A pair of side plates and a pair of side plates standing upright around the periphery of the outer die formed in a substantially box shape, and a cylindrical inner die disposed inside the outer die in the length direction over the entire length thereof. The inner mold has a drawing mechanism to reduce the diameter at the time of demolding, and the inner mold can be pulled out of the concrete product while the mold body is rotated at an appropriate angle on the base during demolding. It is a formwork of a cylindrical concrete product characterized by the following.

[0006] Since the formwork of the present invention has the above-mentioned structure, it can be put on a normal concrete product production line to produce a concrete product. In a normal concrete product manufacturing line, the formwork flows continuously in the length direction,
In the mold of the present invention, since the mold body is rotated by an appropriate angle when the mold is removed, the direction in which the inner mold is pulled out is different from the direction of the line by an appropriate angle. Therefore, even if the mold is flowing continuously, the inner mold can be pulled out and removed without any trouble.

The inner mold is divided into two parts in the length direction near the center. When the mold is removed, the mold body is rotated at an appropriate angle on the base and the inner mold is divided. Each part can be pulled out in the opposite direction of the wife. With this configuration, the weight and length of the inner die to be pulled out at the time of demolding are reduced to about half, and the inner die is pulled out in the opposite direction, so that the demolding operation is facilitated and the working space is reduced.

In this case, the two divided portions of the inner mold can be connected to and supported by the end plate. By doing so, the inner die is pulled out of the concrete product by separating the end plate from the outer die, so that the work of removing the die and assembling the mold side can be facilitated.

Further, in this case, the inner die can slightly move up and down with respect to the end plate, and when the inner die is squeezed at the time of demolding, the inner die falls slightly with respect to the end plate to reduce the diameter of the inner die. When the mold is assembled in an enlarged manner, the inner mold can be slightly raised by the positioning mechanism to be positioned at a predetermined position. With this configuration, the inner mold slightly descends when the inner mold is squeezed and removed, so that the upper surface of the inner mold is separated from the concrete surface, and the inner mold can be easily pulled out.

The end plate can be moved in a direction away from or approaching the outer mold while being supported by the outer mold by the guide mechanism. In this case, the inner mold can be easily removed from the outer mold by pulling out the inner mold from the outer mold by the guide mechanism. At this time, since the inner mold is pulled out to the opposite side by half, the balance is maintained and the mold frame is stabilized.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments. FIG. 1 is a top view of the formwork 1 of the embodiment, FIG. 2 is a cross-sectional view of the formwork 1 cut inside the end plate,
3 is a longitudinal sectional view of the mold 1, FIG. 4 is a top view of the mold 1 in an open state, FIG. 5 is an explanatory diagram of the removal of the inner mold 5, and FIG. 7 is a cross-sectional view of the mold 1 mainly showing an inner die drawing mechanism, FIG. 8 is a vertical cross-sectional view of the vicinity of a joint of the inner mold 5, and FIGS. FIG. 12 is an exploded explanatory view of the inner die drawing mechanism, and FIG. 13 is an explanatory diagram of an example of a concrete product production line using the mold 1. In FIGS. 1 to 6, details such as an inner die aperture mechanism are omitted.

The formwork 1 of the embodiment is for forming a tubular underdrain block, and has a base 2 and a formwork main body 3. The pedestal is made of a steel material and is assembled into a flat rectangular shape, the upper surface is a smooth flat surface, and the rotating shaft 10 protrudes near the center. The mold body 3 is a box-shaped outer mold 4
And a cylindrical inner mold 5 disposed in the inside thereof over the entire length in the length direction. As shown in FIG. 2 and the like, a space surrounded by the inner surface of the box-shaped outer die 4 and the outer peripheral surface of the inner die 5 is a cylindrical cavity 9, which is filled with concrete and cured. As a result, a tubular culvert block is formed. The outer die 4 is formed in a substantially box shape by a bottom plate portion 8, a pair of side plates 6 erected around the bottom plate portion 8, and a pair of end plates 7. The inner die 5 has a drawing mechanism to be described later, and when the die is removed, the drawing mechanism pulls the concrete product 50 out of the cavity 51 having a reduced diameter as shown in FIG. A bearing hole is formed on the lower surface of the bottom plate portion 8 of the form body 3 at the approximate center thereof, and the rotating shaft 10 of the base 2 is axially mounted on the bearing hole. Bottom plate 8
Form body 3 by wheels 11 and 12 provided on the lower surface of
Can easily rotate on the pedestal 2 around the rotation shaft 10.

As shown in FIG. 2, the side plate 6 of the outer mold 4 is hinged to the bottom plate 8 by a hinge so as to be freely opened and closed. Side plate 6
When the concrete form 1 is assembled, it is firmly fixed in an upright state by a well-known clamp (not shown). When the concrete product is removed from the mold, the clamp is released and the clamp is released as shown by a chain line in FIG. Open to the outside.

As shown in FIG.
The two rails 13 are fixed to the lower part of. The bottom plate 8 is provided with a plurality of guide wheels 14 for moving the rail 13 in the length direction. The guide wheel 14 is mounted on a reinforcing member of the bottom plate 8 (not shown). Also,
A support rod 15 protruding inward is fixed to the upper part of each end plate 7. The base plate 7 is firmly fixed in a state shown in FIG. 3 by a well-known clamp (not shown) in a state where the formwork 1 is assembled. When the concrete product is removed from the mold, the clamp is released. Move outward as shown in FIG. At this time, the rail 13
Is smoothly moved by the action of the guide wheel 14, so that the end plate can be easily moved. When the rear plate has moved to some extent, a stopper (not shown) provided on the rail 13 operates to stop the movement.

The cylindrical inner mold 5 is divided into two parts 5a and 5b at the center. At the joint 16, as shown in FIGS. 7 and 8, the pin 26 is positioned by engaging the hole of the engagement piece 27. The lower part of each of the inner dies 5a and 5b is a sash 18 that can move up and down, and a plurality of reinforcing plates 19 and 20 are formed on the inner surface. A bent portion 21 between the reinforcing plates 19 and 20 is bent when the inner die is squeezed.
It has become. When the inner die 5 is squeezed, as shown in FIG. 5, the sashi 18 is raised by a squeezing mechanism (not shown in FIG. 5), and both sides are moved inward. Then, the diameter of the inner mold 5 (5a, 5b) is reduced, and the concrete product 50 (5a, 5b) is reduced.
A gap is formed between the inner molds 5a and 5b, so that the inner dies 5a and 5b can be pulled out of the cavity 51. Reinforcement plate 1
9, as shown in FIG. 2 and the like, a hole 22 for penetrating the support rod 15 is provided. There is a gap 23 between the upper surface of the hole 22 and the upper surface of the support rod 15. When the inner mold 5 is squeezed, the inner mold 5 can be lowered by an interval of the gap 23. As shown in FIG. 7, the reinforcing plate 1 at the end of the inner die 5
9, a tapered pin 25 is formed, and a hole for fitting the pin 25 is formed on the inner surface of the end plate 7 correspondingly. The inner die 5 is positioned by fitting the pin 25 into this hole. That is, the hole and the pin 25 are an internal positioning mechanism.

When the inner mold 5 is removed, the inner mold is first squeezed by a squeezing mechanism. Next, the clamping device such as a clamp is released and the end plates 7, 7 on both sides are slightly pulled out. Then, the pin 25 is disengaged from the hole of the base plate, and the positioning of the inner dies 5a and 5b is released. As shown in FIG. 5, the inner dies 5 are lowered by the gap 23, and the inner dies 5a and 5b are Supported by When the wife plates 7, 7 on both sides are further pulled out, FIG.
Then, the projections 24 provided on the support rod 15 shown in FIG. 5 abut against the reinforcing plate 19, and then the inner dies 5a, 5b are pulled out together with the end plates 7, 7 in a state instructed by the support rod 15. At this time, since the inner dies 5a and 5b are slightly lowered, there is a gap between the upper surface of the inner die and the lower surface of the hollow portion 51 of the concrete product 50, and the inner die is smoothly pulled out without resistance. .

When assembling the inner mold, the end plates 7, 7 are pushed inward from both sides. Then, the inner mold 5a,
The joining end faces 5b abut against each other, and the pin 26 shown in FIG. When the boring plates 7, 7 are further pushed down until they come into contact with the inner dies 5a, 5b, the pins 25 are fitted into the holes of the boring plate, as shown in FIG.

Although various well-known diaphragm mechanisms can be used as the inner diaphragm mechanism in the present invention, an example of a suitable diaphragm mechanism will be described. The aperture mechanism shown in FIGS. 7 to 12 includes an operation bolt 30, gears 32 and 33, an interlocking shaft 34, a rotating piece 35, an upper and lower piece 36, and a guide piece 39. The operation bolt 30 and the interlocking shaft 34 are rotatably mounted on the reinforcing plate 19.
The operation bolt 30 has a connection portion 31 at the center and both ends projecting to the outside of the inner mold. The connecting portion 31 is a portion that separates when the inner die is removed from the inner die. One of the connecting portions 31 has a cylindrical shape, and the other is inserted into the cylindrical portion, and the rotational force is transmitted. In order to transmit the rotational force, the cross-sectional shape of the inner surface of the cylinder and the insertion portion may be a shape other than a circle such as a polygon. The operating bolt 30 and the interlocking shaft 34 have the gear 3
2, 33 are fixed. Since the gears 32 and 33 have exactly the same shape, when the operation bolt 30 is rotated, the interlocking shaft 34 rotates in the opposite direction by the same angle. Two turning pieces 35 are respectively fixed to the operation bolt 30 and the interlocking shaft 34, and upper and lower pieces 36 are pin 3 between the two turning pieces 35.
7, so that it is rotatably mounted on the shaft. The lower ends of the upper and lower pieces 36 are rotatably mounted on pins 41 on a receiving piece 41 provided on the upper surface of the sash 18. Guide pieces 39 are fixed to the upper surface of the sash 18, and guide pins 39 provided on the upper portions on both sides thereof are engaged with guide grooves 38 provided on the reinforcing plates 20 on both sides. The guide groove 38 is provided so as to be inclined such that its upper part is directed outward.

As shown in FIG.
These are interlocked by rotating the operation bolt 30. When the end of the operation bolt 30 is rotated by using a tool such as a spanner, the rotating piece 35 is rotated, and the upper and lower pieces 36 are raised, as shown in FIGS. To rise. Then, the guide pin 40 moves up in the guide groove 38, and the side surface of the inner die moves inward as shown in FIG. 11, and the drawing is completed. When assembling the inner mold, the operation bolt may be rotated in the opposite direction. This aperture mechanism can be used for internal aperture reduction and assembly only by rotating the operation bolt, and the operation is extremely simple.

FIG. 13 shows an example of a concrete product manufacturing line using the formwork 1. The mold 1 in which the curing of the concrete is completed is supplied in the direction of arrow P from the curing room. On the line, the form 1 is transferred in the direction of arrow Q by a transfer means such as a conveyor. In section A, the concrete product is demoulded. In the removal of the mold, since the rear plate and the inner mold obtained by rotating the mold body 3 by an appropriate angle are drawn out, it is possible to pull out even if the mold 1 is continuous on the line. Also, since the inner mold is divided into two and pulled out on both sides,
The balance is good and the formwork is stable. The mold 1 from which the mold has been removed is sent to the section B, where operations such as cleaning of the mold, assembling, and assembling of reinforcing bars are performed. Next, the formwork 1 is sent to the C section, where concrete is charged and compacted. The form 1 filled with the concrete is sent to a curing room in the direction of arrow R, and the concrete is cured.

[0021]

According to the form of the present invention, since the form body rotates on the pedestal, the inner mold can be removed in a normal concrete product manufacturing line. A tubular concrete product can be manufactured in a concrete product manufacturing line, and the manufacturing efficiency can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a top view of a mold 1 according to an embodiment.

FIG. 2 is a cross-sectional view of the formwork 1 that is longitudinally cut inside the end plate.

FIG. 3 is a longitudinal sectional view of the mold 1. FIG.

FIG. 4 is a top view in a state where the mold 1 is opened.

FIG. 5 is an explanatory diagram of removal of the inner mold 5;

FIG. 6 is a longitudinal sectional view of the mold 1 with the inner mold 5 pulled out.

FIG. 7 is a cross-sectional view of the mold 1 mainly showing an inner die drawing mechanism.

FIG. 8 is a longitudinal sectional view of the vicinity of a joint of the inner mold 5;

FIG. 9 is an explanatory diagram of a stop of the inner die 5.

FIG. 10 is an explanatory view of a stop of the inner mold 5;

FIG. 11 is an explanatory diagram of a stop of the inner mold 5;

FIG. 12 is an exploded view of the inner die throttle mechanism.

FIG. 13 is an explanatory diagram of an example of a concrete product manufacturing line using the formwork 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Formwork 2 base part 3 Formwork main body 4 Outer mold 5 Inner mold 6 Side plate 7 Wife plate 8 Bottom plate 9 Cavity 10 Rotating shaft 11 Wheel 12 Wheel 13 Rail 14 Guide wheel 15 Support rod 16 Joint 17 Hinge 18 Sashi 19 Reinforcement Plate 20 Reinforcement plate 21 Bend portion 22 Hole 23 Gap 24 Projection 25 Pin 26 Pin 27 Engagement piece 30 Operation bolt 31 Connection part 32 Gear 33 Gear 34 Interlocking shaft 35 Rotating piece 36 Upper and lower piece 37 Pin 38 Guide groove 39 Guide piece 40 guide pin 41 receiving piece 42 pin 50 concrete product 51 cavity

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B28B 21/88 B28B 7/30 B28B 15/00 B28B 21/18

Claims (5)

(57) [Claims] 1. A mold having a base and a form body mounted on the base so as to be rotatable with respect to a vertical axis, and the form body stands upright on a bottom plate and around the bottom plate. An outer die formed in a substantially box shape by each set of the side plate and the end plate, and a cylindrical inner die disposed inside the outer die in the length direction over the entire length thereof, and the inner die is detached. A tubular concrete product having a drawing mechanism for reducing the diameter at the time of demolding, and being able to pull out the inner mold to the outside of the concrete product in a state where the mold body is rotated at an appropriate angle on the base portion at the time of demolding. Formwork 2. The mold according to claim 1, wherein the inner mold is divided into two parts in the length direction near the center, and the mold body is rotated at an appropriate angle on the base when removing the mold. Wherein the two divided parts of the inner mold are drawn out in opposite directions to the wife side, respectively. 3. The mold according to claim 2, wherein the divided two portions of the inner mold are connected and supported by the end plate, respectively. 4. The mold according to claim 3, wherein the inner die can move up and down slightly with respect to the end plate, and when the inner die is squeezed in removing the inner die, the inner die slightly descends with respect to the end plate. A mold for assembling the tubular concrete product, wherein when the mold is assembled by enlarging the diameter of the inner mold, the inner mold is slightly raised by the positioning mechanism to be positioned at a predetermined position. 5. The tubular concrete product according to claim 3, wherein the end plate is movable in a direction away from or approaching the outer mold while being supported by the outer mold by a guide mechanism. Formwork