JP2535140B2 - Forming equipment for molding concrete products - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete product forming frame device, and more particularly to a concrete product forming device for forming concrete products and forming voids such as punching recesses and through holes at predetermined positions on the side walls thereof.

[0002]

2. Description of the Related Art Conventionally, for example, wires such as electric wires and telephone lines are stretched by using electric poles erected on the ground, but these wires tend to be buried in the ground in recent years. In this case, for example, a concrete product molded in a substantially inverted U shape is buried in the ground and wired along the inner side wall of this concrete product, and this wiring punches out a predetermined position on the side wall of the concrete product. It is designed to be drawn in and out from the wiring insertion hole formed by.

Therefore, when a concrete product of this type is molded, a punching recess is formed at a predetermined position on the side wall of the concrete product. An inner mold body that molds an inner side surface, an outer mold body that molds an outer side surface of the concrete product, and is disposed between the inner mold body and the outer mold body and is detachably attached to the inner mold body. A middle die for forming a recess for punching, a mounting hole for bolt insertion is formed in the inner die body at a mounting position of the middle die body, and the inner die body is attached to an inner plate of the middle die body. A screw hole communicating with the hole is formed, and a tightening bolt is inserted from the mounting hole of the inner mold body into the screw hole of the middle mold body and screwed to attach the middle mold body to the inner mold body in a removable manner. Has been.

[0004]

In the structure of the prior art in which the recess for punching is formed in the side wall of the concrete product,
When attaching the middle mold to the inner mold, press the inner plate of the middle mold against the outer part of the inner mold and insert the tightening bolt from the mounting hole of the inner mold into the screw hole of the middle mold. For screwing, aligning the screw hole of the middle mold with the mounting hole of the inner mold and pushing the middle mold and supporting it, and the work of screwing the tightening bolt from the inner part of the inner mold to the middle mold. Need two workers,
There is a problem that it is not preferable from the viewpoint of improving the work efficiency and reducing the production cost because the attachment work requires labor.

The present invention has been made in view of the above point, and a tightening bolt of a medium-sized body is inserted into a mounting hole of a mold body, and a tightening operation of the tightening bolt is performed, whereby a single person A worker can easily attach a medium-sized body that forms a void in a concrete product to the body, so that the screw hole of the medium-sized body is aligned with the mounting hole of the body and the medium-sized body is pushed. You don't have to support it
Provides a mold device for concrete product molding that can easily support the mold by matching the middle mold to the mold, and the support structure of this middle mold is also simple, which improves work efficiency and reduces production costs. The purpose is to do.

[0006]

A concrete product molding form apparatus according to claim 1, wherein an inner mold body for molding an inner side surface of the concrete product, and an outer mold body for molding an outer side surface of the concrete product. A middle mold body that is located between the inner mold body and the outer mold body and is detachably attached to any one of the inner mold body and the outer mold body to form a void in the concrete product. One of the inner mold body and the outer mold body has a vertical mounting hole formed at a mounting position of the middle mold body, and the mounting hole is formed on the upper side. It is composed of a diameter insertion portion and a small diameter insertion portion formed in the lower portion in communication with the large diameter insertion portion, the middle mold body has a contact surface portion for contacting the one mold body, and the contact surface portion includes the contact surface portion. Protruding a cavity forming part with a reduced diameter inclined toward the other mold, and at the protruding end of this cavity forming part A tightening bolt having a surface portion and having a large-diameter head portion inserted into the large-diameter insertion portion of the mounting hole on the abutting surface portion and having a screw shaft portion inserted into the small-diameter insertion portion of the mounting hole is removable. It is screwed on.

The concrete product forming frame apparatus according to a second aspect is the concrete product forming frame apparatus according to the first aspect, in which one of the two mold bodies is arranged vertically above or below the attachment position of the middle mold body. The middle mold body has a pair of mounting holes, and the middle mold body has a pair of tightening bolts that are respectively inserted into the pair of mount holes of the one mold body.

A mold apparatus for molding concrete products according to claim 1, characterized in that

The concrete product forming frame apparatus according to claim 3 is the concrete product forming frame apparatus according to claim 1, wherein the middle mold body has a void forming portion for forming a punching recess in the concrete product. It is a thing.

The concrete product forming mold apparatus according to claim 4 is the concrete product forming mold apparatus according to claim 1, wherein the middle mold body has a void forming portion for forming a through hole in the concrete product. Is.

[0011]

In the formwork apparatus for molding concrete products according to the first aspect of the present invention, the large-diameter head portion of the tightening bolt screwed to the medium-sized body is inserted into the large-diameter insertion portion of the mounting hole formed in the mold body. , When this middle-sized body is lowered, the screw shaft portion of the tightening bolt of this middle-sized body is engaged with the small-diameter insertion portion of the mounting hole, and the screw shaft portion Is prevented from slipping out from the small-diameter insertion portion of the mounting hole, and therefore, the middle bolt is easily supported by the fastening bolt by the fastening bolt.

Further, by rotating the large-diameter head portion of the tightening bolt engaged with the small-diameter insertion portion of the mounting hole of the mold body and screwing the tightening bolt into the middle mold body to perform the tightening operation, The medium-sized body is easily attached to the body in a fitted state. Therefore, a single worker can easily attach the middle mold for molding the void in the mold.

Next, when the concrete product is taken out after the concrete is poured and cured, the large-diameter head portion of the tightening bolt is rotated in the direction opposite to that in the case of the above-mentioned mold matching to move the tightening bolt to the middle-sized body. By pulling out the nut body, the tightening bolt is easily detached from the middle mold body, and the middle mold body is easily separated from the mold body.

Further, by releasing the outer mold from the outer surface of the concrete product and releasing the inner mold from the inner surface of the concrete product or by lifting the concrete product, the concrete product is easily taken out. be able to. Then, the medium product is released from the concrete product to obtain a concrete product in which a void is formed by the medium product.

At the time of releasing the above-mentioned middle mold body, since the middle mold body has a cavity molding part whose diameter is reduced and inclined toward the other mold body, the middle mold body is easily separated from the concrete product at this cavity molding part. Can be released.

According to another aspect of the present invention, there is provided a mold device for concrete product molding, wherein one mold body has a pair of vertical mounting holes in the vertical direction or the left and right directions, and the middle mold body has a pair of mounting holes inserted into the pair of mounting holes. Since it has the tightening bolts, the pair of mounting holes and the pair of tightening bolts support the middle-sized body in a fixed position without rotating the mold, and the middle-sized body is surely aligned with the mold. It is easily attached to the closed state, and this medium-sized body is prevented from moving by the pouring pressure of concrete.

In the concrete product forming frame apparatus according to the third aspect, the hollow portion for forming the middle product is used to form the punching concave portion in the concrete product.

According to the fourth aspect of the present invention, there is provided a frame device for molding a concrete product, in which a through hole is formed in the concrete product at the void forming portion of the middle mold body.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The structure of an embodiment of the present invention will be described below with reference to the drawings.

In the first embodiment shown in FIGS. 1 to 4,
Reference numeral 1 is a gantry formed in a rectangular shape, and an inner mold body 2 for molding the inner surface of the concrete product A is disposed on the gantry 1. The inner mold body 2 is formed by a molding plate 3 formed in a substantially inverted U shape and a reinforcing frame body 4 that reinforces and supports the molding plate 3, and the molding plate 3 is arranged on both side portions in the left-right direction. The molding side plate portion 5 is formed, and the molding top plate portion 6 integrated with the molding side plate portions 5 on both sides is disposed between the upper ends of the molding side plate portions 5 on both sides.

Further, at the lower ends of the molding side plate portions 5 on both sides, there is a step forming portion 7 horizontally projected outward, and the step forming portion 7 is downwardly extended from the outer end thereof. An inner end forming portion 8 is formed vertically toward the inner end forming portion 8. A lower end portion of the inner end forming portion 8 is formed with a horizontal end face forming portion 9 mounted on the frame 1. .

Further, in the molding side plate portions 5 on both sides of the molding plate 3, a pair of vertical mounting holes 10 are formed at predetermined intervals at a plurality of positions above and below and on the left and right of the predetermined position. Has been done. A pair of mounting holes for each part
10 has a large-diameter insertion portion 11 in the upper part thereof, and a small-diameter insertion portion 12 in the lower part that communicates with the large-diameter insertion portion 11 and is generally formed into a substantially perforated hole shape.

Numeral 13 is an outer mold body for molding the outer surface of both sides of the concrete product A in the left-right direction. The outer mold bodies 13 on both sides reinforce and support the vertical molding plate 14 and the molding plate 14. It is formed of a reinforced frame body (not shown). Also,
The outer mold bodies 13 on both sides are vertically supported by a support body (not shown) that can move back and forth with respect to the left and right portions of the gantry 1.

The molding plates of the outer mold bodies 13 on both sides
The lower end of 14 is the end face forming portion 9 of the forming side plate portion 5 on both sides.
It is designed to be matched with the outer end of
When the lower ends of the molding plates 14 are matched with the outer ends of the end face molding portions 9 on both sides, the upper ends of the molding plates 14 on both sides are directed upward from the position of the molding top plate portion 6. The molded top plate portion 6 and the molded plate 14 above the molded top plate portion 6 are projected.
Thus, the horizontal part is formed on the concrete product A.

Further, 15 is a medium mold body for molding a punching concave portion as a void in the concrete product A, and the medium mold body 15 is in the vertical direction in contact with the molding side plate portions 5 on both sides of the inner mold body 2. It has a contact plate 16 as a contact surface of a long rectangular shape, and a molding side plate 17 as a cavity molding part which gradually inclines toward the outer mold body 13 as a cavity molding part integrally projects on the contact plate 16. A molding bottom plate 18 as an end face portion is integrally formed at the protruding end portion of the molding side plate 17.

The molding side plates 17 are vertically and horizontally slanting side plates which are integrally projected from the upper and lower and left and right edges of the abutting plate 16 toward the outer mold body 13 with a gradually decreasing diameter. 17a, and the molding bottom plate 18 is formed on the outer end of each of the upper and lower and left and right integrated inclined side plates 17a. The molding bottom plate 18 is formed on both sides of the inner mold body 2 on both sides. When the molding plates 14 of the outer mold body 13 are matched with each other, the molding plates 14 are set apart from the molding plate 14 on the molding side plate portion 5 side at a predetermined distance.

Further, communication holes 19 are formed above and below the contact plate 16 at intervals corresponding to the upper and lower mounting holes 10 of the molding side plate portion 5, respectively. The communication hole 19 is provided at the opening edge outside the upper and lower communication holes 19.
Nut bodies (20) having screw holes communicating with (4) are integrally fixed by welding or the like.

The upper and lower nut bodies 20 each have a large-diameter head 21 of a polygonal shape such as a hexagon that is inserted into the large-diameter insertion portion 11 of the upper and lower mounting holes 10, and the upper and lower mounting holes 10 Tightening bolts 23 each having a small-diameter insertion portion 12 and a screw shaft portion 22 inserted into the upper and lower communication holes 19 are detachably attached. The large-diameter heads 21 of the upper and lower tightening bolts 23 are formed to have a larger diameter than the small-diameter insertion portions 12 of the upper and lower mounting holes 10.
The large-diameter head portion 21 prevents the tightening bolts 23 from coming off the small-diameter insertion portion 12.

Next, the operation of the structure of the first embodiment will be described.

With respect to the large-diameter insertion portions 11 of the pair of upper and lower mounting holes 10 in the respective portions of the molding side plate portion 5 on both sides of the inner mold body 2, the respective middle dies from the outer side portion of the molding side plate portion 5 toward the inner side. Large-diameter head 21 of a pair of upper and lower tightening bolts 23 screwed to the body 15
When each is inserted, the large-diameter heads 21 of the pair of tightening bolts 23 of each medium-sized body 15 are projected from the large-diameter insertion portions 11 of the pair of mounting holes 10 to the inside of the molding side plate portion 5.

When the respective middle mold bodies 15 are lowered along the respective molding side plate portions 5, the screw shaft portions 22 of the pair of tightening bolts 23 of the respective middle mold bodies 15 are inserted into the pair of mounting holes 10 having a large diameter. The small-diameter insertion portion 12 is engaged with the portion 11 and the large-diameter head portions 21 of the pair of tightening bolts 23 prevent the screw shaft portion 22 from coming off the small-diameter insertion portion 12 of the pair of mounting holes 10. ,
Each middle mold body 15 is simply supported on each part of the inner mold body 2 by a pair of tightening bolts 23.

Next, the operator who supports each of the middle mold bodies 15 on each part of the inner mold body 2 moves to the inner part of the inner mold body 2, and the worker attaches a pair of each part of the inner mold body 2. Small diameter insertion part 12 of hole 10
The large-diameter heads 21 of the pair of tightening bolts 23 engaged with each other are rotated to move the pair of tightening bolts 23 into the respective medium-sized bodies.
By screwing the nut body 15 into the nut body 20 and performing the tightening operation, the middle mold bodies 15 are easily attached to the respective parts of the inner mold body 2 in a state of being matched with each other.

Therefore, a plurality of middle molds 15 for molding the voids, that is, the recesses 24 for punching, in the concrete product A are simply attached to the outer parts of the inner mold 2 by one operator. .

Next, when the outer mold bodies 13 supported by movable supports are moved toward the left and right parts of the gantry 1, the lower ends of the molding plates 14 of the outer mold bodies 13 on both sides are moved inward. The upper end portions of the molding plates 14 on both sides are aligned with the outer end portions of the end face molding portions 9 of the molding side plate portions 5 on both sides of the mold body 2, and the positions of the molding top plate portion 6 of the inner mold body 2 are aligned with each other. It is in a state of protruding further upward.

Further, front and rear end plates (not shown) are respectively arranged between front and rear end portions of the molding side plate portions 5 on both sides of the inner mold body 2 and the molding plates 14 of the outer mold body 13 on both sides. The front and rear gable plates, the inner mold body 2 and the outer mold bodies 13 on both sides are clamped and fixed by a tightening member,
A cavity whose upper side is opened is formed by the inner mold body 2 and the outer mold bodies 13 on both sides, and a plurality of middle molds attached to the molding side plate portions 5 on both sides of the inner mold body 2 are formed in the cavity. The bodies 15 are respectively provided in a protruding manner, and a predetermined space which is a part of a cavity is formed between the molding bottom plate 18 of each middle mold body 15 and the molding plates 14 of the outer mold bodies 13 on both sides.

Then, the concrete product A is molded by pouring and curing concrete in the cavity. At this time, since each middle mold body 15 is clamped and fixed to each part of the inner mold body 2 by a pair of upper and lower tightening bolts 23, each middle mold body 15 is fixed to the inner mold body 2 without rotating. In addition to being supported at a position, each middle mold body 15 is attached to the inner mold body 2 in a state where the middle mold bodies 15 are surely matched with each other, and each middle mold body 15 is rotated or moved by the pouring pressure of concrete. Is prevented.

Next, when the concrete product A is taken out after pouring and curing the concrete, the large-diameter heads 21 of the pair of tightening bolts 23 of each medium-sized body 15 are moved in the opposite direction to the case of the above-mentioned mold matching. The pair of tightening bolts 23 of each of the middle-sized bodies 15 are pulled out from the nut bodies 20 of the respective middle-sized bodies 15 by rotating the pair of tightening bolts 23 to the nut bodies 20 of the respective middle-sized bodies 15. Then, each of the middle mold bodies 15 is easily separated from the inner mold body 2.

The outer mold bodies 13 on both sides are released from the outer surface of the concrete product A. Then, by releasing the inner mold body 2 from the inner surface of the concrete product A or by lifting the concrete product A, the concrete product A is easily taken out from the gantry 1. Further, by releasing each medium-sized body 15 from the concrete product A, a concrete product A in which a plurality of recessed portions 24 for punching are formed by a plurality of medium-sized bodies 15 at predetermined positions inside the concrete product A is obtained. can get.

When this concrete product A is molded into a substantially U-shape (generally an inverted U-shape at the time of molding), a plurality of medium-sized bodies 15 are provided at predetermined positions of the vertical portions on both sides. The punching recesses 24 are respectively molded.

When releasing each of the middle mold bodies 15 from the concrete product A, each of the middle mold bodies 15 is formed with a molding side plate 17 composed of upper and lower and left and right inclined side plates 17a which are inclined toward the outer mold body 13 with a reduced diameter. Since it has, that is, the forming side plate 17 composed of the inclined side plates 17a is formed in a taper shape which expands and inclines toward the direction in which each medium-sized body 15 is released from the concrete product A, the forming side plate of each surface portion is formed. At 17, each medium-sized body 15 is smoothly and easily released from the concrete product A.

The punching recess 24 formed in each of the medium-sized bodies 15 has a vertical punched bottom portion 25 formed by the molding bottom plate 18 of each of the medium-sized bodies 15, and a molding side plate of each of the medium-sized bodies 15. A wiring insertion port 26 is formed in each of the upper and lower and left and right inclined side plates 17a, which is continuous with the punched bottom portion 25 and expands inward.

Further, when wiring is provided in the concrete product A, all of the punching recesses 24 formed in the inner portion of the concrete product A or the necessary locations depending on the situation where the wiring is provided. The punching recess 24 is punched. At this time, the punching bottom portion 25 of the punching recess 24 is punched outward, so that the concrete product A has a wiring insertion port 26.
A wiring insertion hole 27 that communicates with is formed.

Next, in the first embodiment, the case where a plurality of punching recesses 24 are formed at predetermined positions on the inner side of the concrete product A has been described, but the present invention is not limited to this, and the second embodiment shown in FIG. As described above, the plurality of punching recesses 24 may be formed at predetermined positions on the outer side of the concrete product A.

In this case, as shown in FIG.
Similar to the molding plate 3 of the inner mold body 2 of the first embodiment, the molding plate 14 is provided with a pair of upper and lower mounting holes 10 at predetermined positions in the vertical and horizontal directions. The pair of mounting holes 10 of each of these parts are provided with a large-diameter insertion part in the upper part as in the first embodiment.
11 has a small-diameter insertion portion 12 in the lower portion thereof, and is formed in a generally perforated shape. The rest of the configuration is the same as that of the first embodiment, so the same reference numerals are given to the parts of the same configuration as in the first embodiment, and the description is omitted.

Then, in the molding plate 14 of the outer mold body 13, the pair of mounting holes 10 of the respective parts is inserted into the molding plate 14 from the inner side of the molding plate 14 in the same manner as in the first embodiment. Tightening bolt
By fitting and tightening 23, a plurality of medium-sized bodies 15 can be easily attached to the inside of each part of the molding plate 14.

Further, the molding plates 14 of the outer mold bodies 13 on both sides having the plurality of middle mold bodies 15 are matched with the molding side plate portions 5 on both sides of the inner mold body 2 in the same manner as in the first embodiment. As a result, a cavity is formed by the molding plates 3 on both sides of the inner mold body 2, the molding plates 14 of the outer mold body 13 on both sides, and the front and rear end plates in the same manner as in the first embodiment. Includes a plurality of medium-sized bodies attached to the molding plates 14 of outer mold bodies 13 on both sides.
15 are provided in a protruding manner, and a predetermined space, which is a part of a cavity, is formed between the molding bottom plate 18 of each middle mold body 15 and the molding side plate portions 5 on both sides of the inner mold body 2.

A concrete product A is molded by pouring and curing concrete in the cavity, and a plurality of recessed portions for punching are formed in a predetermined position on the outer side of the concrete product A by a plurality of medium-sized bodies 15. 24 are molded, and in each of the recessed portions 24 for punching, a vertical punched bottom portion 25 is molded by the molding bottom plate 18 of each medium-sized body 15, and the upper and lower sides and the left and right sides of the molding side plate 17 of each medium-sized body 15 are formed. Inclined side plate 17a
At, a wiring insertion opening 26 is formed which is continuous with the punched bottom portion 25 and expands outward.

Further, when wiring is provided in the concrete product A, all of the punching recesses 24 formed on the outer side of the concrete product A or the locations required depending on the situation where the wiring is provided. The punching recess 24 is punched out. At this time, the punching bottom portion 25 of the punching recess 24 is punched inward so that the concrete product A as shown in FIG.
A wiring insertion hole 27 communicating with the wiring insertion port 26 is formed therethrough.

Next, in each of the above-mentioned embodiments, the pair of mounting holes 10 formed in each of the molding side plate portions 5 on both sides of the inner mold body 2 and the molding plate 14 of the outer mold body 13 are vertically separated from each other. However, the pair of mounting holes 10 may be formed in the molding side plate portions 5 on both sides of the inner mold body 2 and the molding plate 14 of the outer mold body 13 so as to be separated from each other in the left and right directions. . In this case, the pair of tightening bolts 23 that are removably inserted into the pair of left and right mounting holes 10 are nut bodies arranged on the left and right of each middle-sized body 15.
Each of the 20 is detachably screwed.

Further, in each of the above-mentioned embodiments, the pair of mounting holes 10 formed in each of the molding side plate portions 5 on both sides of the inner mold body 2 and the molding plate 14 of the outer mold body 13 are in the form of a polished hole as a whole. Although the case of forming is described, the present invention is not limited to this, and the pair of mounting holes is formed.
10 is a pair of tightening bolts 23 at the large-diameter insertion portion 11 above it.
Of the large-diameter head 21 and the small-diameter insertion portion 12 below the large-diameter head 21 has a shape in which the screw shaft portions 22 of the pair of tightening bolts 23 can be inserted and removed. It is only necessary that the large-diameter head portion 21 of the tightening bolt 23 can prevent the screw shaft portion 22 from coming off.

Next, in each of the above-mentioned embodiments, the mold device for forming the punching recesses 24 at the predetermined positions on the inner side and the outer side of the concrete product A in the middle mold body 15 has been described, but the present invention is not limited to this. Instead, a through hole penetrating the concrete product A may be formed at a predetermined position of the concrete product A.

In this case, for example, as shown in FIGS. 7 and 8, the molding side plate portion 5 of the inner mold body 2 has a plurality of upper and lower and left and right predetermined positions of the molding side plate portion 5 as in the above-described embodiment. A mounting hole 10 that is long in the vertical direction is formed at a location, and each mounting hole 10 has a large-diameter insertion portion 11 and a small-diameter insertion portion 12 and is generally formed in a substantially polished shape.

Further, the middle mold body 31 for molding the through hole 39 at a predetermined position of the concrete product A has a circular contact surface portion 32 for contacting the molding side plate portion 5 of the inner mold body 2. A cavity forming portion 33, which is continuous with the surface portion 32 and has a reduced diameter and inclined toward the forming plate 14 of the outer die body 13, is projected, and the forming plate of the outer die body 13 is formed at the protruding end portion of the cavity forming portion 33. The abutting surface portion 32 that abuts the 14
The circular end surface portion 34 having a smaller diameter is formed, and is formed in a substantially conical shape as a whole.

A screw hole 35 is axially formed in the center of the contact surface portion 32 of the middle-sized body 31, and a tightening bolt 36 is detachably screwed into the screw hole 35. The tightening bolt 36 has a large-diameter head portion 37 that is inserted into the large-diameter insertion portion 11 of the mounting hole 10 as in the above embodiment, and a screw shaft portion 38 that is inserted into the small-diameter insertion portion 12 of the mounting hole 10. have.

With this structure, similarly to the above-mentioned embodiment, the tightening bolt 36 screwed to the middle mold body 31 is inserted into the mounting hole 10 of the molding side plate portion 5 of the inner mold body 2, and this tightening is performed. bolt
36 is inserted into the small-diameter insertion portion 12 from the large-diameter insertion portion 11 of the mounting hole 10, and the tightening bolt 36 is rotated to perform a tightening operation. In the state where the contact surface portions 32 are matched, the molding side plate portion 5
The medium-sized body (31) is easily tightened and fixed to and attached.

When the molding plate 14 of the outer mold body 13 is matched with the molding side plate part 5 of the inner mold body 2 in the same manner as in the above-described embodiment, the molding side plate part 5 of the inner mold body 2 and the outer mold body 13 are formed. The middle mold body 31 is disposed between the molding plate 14 and the molding plate 14, and the molding plate 14 of the outer mold body 13 is brought into contact with the end surface portion 34 of the middle mold body 31 to perform mold matching.

Then, the molding side plate portion 5 of the inner mold body 2 and the outer mold body
The concrete product A is molded by pouring and curing concrete in the cavity formed between the molding plate 14 of 13 and the medium-sized body 31 when pouring concrete in the cavity. Is clamped and fixed to the molding side plate portion 5 of the inner mold body 2 with a tightening bolt 36, and the end surface portion 34 of the middle mold body 31 is supported by contacting the molding plate 14 of the outer mold body 13. That is, since the middle mold body 31 is sandwiched between the molding side plate portion 5 of the inner mold body 2 and the molding plate 14 of the outer mold body 13, the middle mold body 31 can be moved by the pouring pressure of concrete. To be prevented.

When the concrete product A is taken out, the tightening bolts 36 are removed from the molding side plate portion 5 and the middle mold body 31 of the inner mold body 2 and the inner mold body 2 and the outer mold body 13 are concreted as in the above-mentioned embodiment. The concrete product A is taken out from the product A, and the medium product 31 is removed from the concrete product A.
In the case of releasing the mold, it is the same as the above-mentioned embodiment, but at this time,
Since the void forming portion 33 of the middle mold body 31 is formed in a tapered shape, the middle mold body 31 can be easily and smoothly released from the concrete product A.

Then, a through hole 39 is formed at a predetermined position of the concrete product A by the medium-sized body 31, and the concrete product A having the through hole 39 is obtained. In this embodiment, by disposing a plurality of middle mold bodies 31 at predetermined positions between the molding side plate portion 5 of the inner mold body 2 and the molding plate 14 of the outer mold body 13,
A plurality of through holes 39 are formed at predetermined positions of the concrete product A in each of these medium-sized bodies 31, and the concrete product A having the plurality of through holes 39 is obtained.

When this concrete product A is molded into a substantially L shape (generally an inverted L shape at the time of molding), depending on the number of the medium mold bodies 31 arranged at predetermined positions in the vertical portion thereof. One or more through holes 39 are formed.

[0061]

According to the invention of claim 1, a vertical mounting hole is formed at the mounting position of the middle mold body in one of the inner mold body and the outer mold body. The middle mold body, which has a large-diameter insertion part in the upper part and a small-diameter insertion part in the lower part, and which forms a void in a concrete product, has a contact surface part that comes into contact with one of the mold parts. A protruding portion of a cavity forming portion whose diameter is reduced toward the other mold body, and an end face portion is formed at the protruding end of the cavity forming portion, and the large diameter insertion portion of the mounting hole is formed in the contact surface portion. Since a tightening bolt that has a large-diameter head part that is inserted through and has a screw shaft part that is inserted through the small-diameter insertion part of the mounting hole is detachably screwed, By inserting and inserting and tightening this tightening bolt, one operator can It is possible to easily attach the medium-sized body for molding the void to the product, and therefore, it is not necessary to align the screw hole of the medium-sized body with the mounting hole of the mold and press and support the medium-sized body. Therefore, it is possible to provide a mold product for concrete product molding that can easily match the middle mold to the mold, improve the work efficiency, and reduce the production cost.

According to the second aspect of the present invention, one mold body has a pair of vertical mounting holes formed above and below or to the left and right of the mounting position of the middle mold body, and the middle mold body has a pair of mounting holes of the one mold body. Since there is a pair of detachable tightening bolts that are respectively inserted into the mounting holes, the middle-sized body is rotated in the mold body by the pair of mounting holes and the pair of tightening bolts that are inserted into the pair of mounting holes. It is possible to securely support it in a fixed position without doing so, and it is possible to surely align and fix the position of the middle-sized body to the shape body, and it is possible to prevent the middle-sized body from being displaced due to the placing pressure of the concrete.

According to the third aspect of the present invention, it is possible to form a punching concave portion in the concrete product at the void forming portion of the medium-sized body, and to form a concrete product such as a U-shaped groove for punching a wiring insertion hole. It is preferable as a mold device for

According to the invention of claim 4, the through hole can be formed in the concrete product at the void forming portion of the medium-sized body, and the concrete product such as the L-shaped retaining wall for forming the drain hole is formed. It is preferable as a formwork device.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a concrete product molding form device showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the same medium-sized body attaching portion.

FIG. 3 is a side view of the above inner mold body.

FIG. 4 is an enlarged cross-sectional view of a part of the above concrete product.

FIG. 5 is a partial cross-sectional view of a concrete product molding form device showing another embodiment.

FIG. 6 is an enlarged cross-sectional view of a part of the above concrete product.

FIG. 7 is a partial cross-sectional view of a concrete product forming frame device showing still another embodiment.

FIG. 8 is an exploded perspective view of the same medium-sized body attaching portion.

[Explanation of symbols]

 2 Inner mold body 10 Mounting hole 11 Large diameter insertion part 12 Small diameter insertion part 13 Outer mold body 15,31 Medium mold body 16,32 Abutment surface part 17,33 Void molding part 18,34 End face part 21,37 Large diameter head part 22,38 Screw shaft 23,36 Tightening bolt 24 Punching recess as a void 39 Through hole as a void A Concrete product

Claims (4)

(57) [Claims] 1. An inner mold body for molding an inner surface of a concrete product, an outer mold body for molding an outer surface of the concrete product, and an inner mold body located between the inner mold body and the outer mold body. And a middle mold body that is detachably attached to one of the mold body and the outer mold body and forms a void in the concrete product, and either one of the mold body and the outer mold body The body has a mounting hole in the vertical direction formed at the mounting position of the medium-sized body, and the mounting hole is formed in the lower part communicating with the large diameter insertion part formed in the upper part and the large diameter insertion part. The middle mold body has a contact surface portion that abuts on the one mold body, and a cavity molding portion that is inclined at a reduced diameter toward the other mold body is provided on the contact surface portion. Then, an end surface portion is formed at the projecting end portion of this cavity forming portion, and the contact surface portion is inserted into the large diameter insertion portion of the mounting hole. Diameter head portion and the mounting hole concrete products molding form apparatus characterized by screwed detachably fastening bolt having a threaded shank which is inserted into the small diameter insertion portion of which has a. 2. One of the mold bodies has a pair of vertical mounting holes above and below or to the left and right of the mounting position of the middle mold body, and the middle mold body has a pair of mounting holes inserted into the pair of mounting holes of the one mold body, respectively. The formwork apparatus for molding a concrete product according to claim 1, further comprising a tightening bolt. 3. The concrete product forming mold apparatus according to claim 1, wherein the middle mold body has a cavity forming portion for forming a recess for punching in the concrete product. 4. The medium-sized body has a cavity forming portion for forming a through hole in a concrete product.
Form equipment for molding concrete products as described.