JP3706096B2 - Form for forming cylindrical concrete products - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold for molding a cylindrical concrete product whose end is not closed, such as a manhole side block, a culvert block, or a cylindrical concrete product whose one end is closed such as a fence block.
[0002]
[Prior art]
Forms for forming cylindrical concrete products whose ends are not closed include those for reducing the diameter of the inner mold as disclosed in Japanese Utility Model Publication No. 2-35456, and Japanese Utility Model Application No. 7-2178. It is known that an inner mold divided into three as disclosed in the publication is folded and removed. The inner mold of such a mold has a mechanism for reducing the inner mold (a so-called “drawing mechanism”), and the inner mold is reduced (reduced in diameter or folded) at the time of demolding. The inner mold is extracted.
[0003]
Forms for forming cylindrical concrete products with one end closed have been implemented for a long time, as disclosed in Japanese Utility Model Publication No. 4-27613. It is known (unknown in the literature) that the inner mold is disassembled into pieces and removed.
[0004]
[Problems to be solved by the invention]
For molds that form cylindrical concrete products whose ends are not closed, the former of the above prior arts moves part of the inner mold inward and then folds the parts on both sides inward. The inner mold is reduced in diameter, and the inner mold is extracted from the product. It is excellent in operability for reducing the diameter of the inner mold, or conversely increasing the diameter and returning it, but the diameter is insufficient and there is a gap between the inner mold and the inner surface of the product when the diameter is reduced. There is a problem that it is small and difficult to perform demolding. Further, since the inner mold and the outer mold are completely separated, the work of assembling the inner mold and the outer mold again after demolding becomes complicated.
[0005]
The latter of the above prior arts has many hinged parts (parts that can be folded with a hinge) on the sill plate of the formwork, so that concrete can easily adhere to it and cause malfunctions, making it difficult to clean the formwork. In addition, there is a problem that the dimensional accuracy is slightly deteriorated.
[0006]
As for the mold for forming a cylindrical concrete product whose one end is closed, the former of the above-mentioned conventional techniques is to push up the product with high-pressure air and demold from the inner mold. Manufacture products with no so-called “draft slope” (so that the inner peripheral surface of the product and the outer peripheral surface of the inner mold are tapered so that the diameter decreases toward the top so that the product can be easily removed from the inner mold). I can't respond to my request.
[0007]
The latter of the above prior arts can produce a product with no draft, but the inner mold is completely disassembled at the time of demolding, so the demolding work and the assembling work of the inner mold become extremely complicated, The production efficiency is extremely poor.
[0008]
The present invention is easy to remove and assemble the inner mold, does not require special labor for cleaning, and forms a cylindrical concrete product having a new squeezing mechanism for the inner mold that is excellent in dimensional accuracy. The challenge was to develop a formwork. Another object of the present invention is to develop a mold form for a cylindrical concrete product that does not require a draft angle and is closed at one end so that it can be easily removed and assembled.
[0009]
[Means for Solving the Problems]
The invention of claim 1 of the present application comprises a mold body having a cylindrical outer mold, a cylindrical inner mold and a ring-shaped bottom mold arranged inside thereof, and a base on which the mold body is placed. A cylindrical concrete product forming mold for producing cylindrical concrete by filling concrete into a cylindrical space formed by the outer mold, the inner mold and the bottom mold, and the inner mold has four in the vertical direction. There is provided a moving means that is divided into divided parts, and linearly moves two opposing divided parts of the divided parts in the inner and outer directions, and at least one of the remaining two divided parts A moving means that linearly moves in the outer direction is provided , and a top plate that closes the upper opening of the inner mold is supported by a support member erected on the pedestal, and the outer diameter of the top plate Is smaller than the outer diameter of the upper end portion of the inner mold, and rubber or the like A cylindrical concrete products molding form, wherein the outer diameter becomes the body wears the approximately equal ring and the outer diameter of the inner mold upper portion.
[0010]
The inner mold is divided into four parts, and at the time of demolding, at least three of the divided parts are moved inward, so that the amount of diameter reduction can be increased. Accordingly, the gap between the inner mold outer surface and the product inner surface can be increased during demolding, and the demolding operation becomes easy. Also, unlike the folding type, the inner mold has no hinge part, so no special cleaning work is required and the dimensional accuracy is excellent.
[0011]
With this mold, a cylindrical concrete product with one end closed can be formed. That is, by filling concrete into the cylindrical space formed by the outer mold, the inner mold, and the bottom mold, and the top plate, the cylindrical concrete with one end closed is manufactured. Since the inner mold is reduced in diameter, the concrete product does not require a draft. Although the top plate is not reduced in diameter, the outer diameter of the top plate is smaller than the outer diameter of the inner mold, so that the mold can be removed. However, since the outer diameter of the top plate is small, a small annular step is formed at the boundary with the inner peripheral surface inside the closed surface of the product. It is desirable to provide a draft angle on the outer peripheral surface of the top plate.
[0012]
By attaching a ring made of an elastic material such as rubber to the outer peripheral portion of the top plate, the “step portion” can be reduced or eliminated. That is, the “stepped portion” is eliminated by mounting the ring and making its outer diameter the same as the outer diameter of the upper end of the inner mold. Since the ring is an elastic body such as rubber, when the product is removed from the mold, the ring is deformed, and the friction between the product and the ring or the ring and the top plate is reduced so that the product can be easily removed.
[0013]
The invention according to claim 2 of the present application is the formwork for cylindrical concrete product molding according to claim 1, wherein one of the remaining two divided portions is fixed to a pedestal. It is.
[0014]
Since one of the inner mold divisions is fixed to the pedestal, the rigidity of the formwork is increased and the dimensional accuracy of the product is improved. This eliminates the need for mold removal and assembly. When the bottom mold is fixed to the pedestal, one of the divided parts is fixed to the pedestal and the bottom mold.
[0015]
According to a third aspect of the present invention, in the mold according to the first or second aspect, the moving means for moving the two opposing divided portions in the inner and outer directions is disposed in the inner mold so as to be rotatable in the vertical direction. A cylindrical concrete product forming form characterized in that the two working shafts are clamped and a clamp mechanism is installed between each of the working shafts and each of the divided portions.
[0016]
By adopting a combination of an operating shaft and a clamp mechanism as the moving means for each of the two divided portions facing each other, each divided portion can be easily and reliably moved. As the clamping mechanism, known ones such as those disclosed in Japanese Utility Model Publication Nos. 4-10013 and 5-9126 can be employed.
[0017]
According to a fourth aspect of the present invention, in the mold of the first or second aspect, the moving means for moving the two opposing divided portions in the inner and outer directions is rotatable in the vertical direction to the central portion of the inner die. A cylindrical concrete product forming form characterized in that it is a single working shaft and a clamp mechanism constructed between the working shaft and the two opposing divided portions.
[0018]
In this configuration, the two operating shafts in claim 3 are combined with one operating shaft. By rotating one operating shaft, the two opposing divided portions can be simultaneously moved in the inner and outer directions, so that it is easy to reduce the diameter of the inner mold and to return after expanding the diameter.
[0019]
According to a fifth aspect of the present invention, in the mold according to the third or fourth aspect, the clamp mechanism includes a rotating piece and a bar-shaped connecting member having one end formed in a U-shape, and the rotating piece is operated as described above. The connecting member is fixed to the shaft and rotates with the rotation of the operating shaft, and the connecting member has a U-shaped tip pivotally attached to the rotating piece and the other end pivotally attached to the dividing portion to be moved. This is a form for forming a cylindrical concrete product.
[0020]
The clamp mechanism according to claim 5 can move the inner divided portion in the inner and outer directions with a simple structure.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings relating to the embodiments. 1 is a top view of a mold 1 of a reference example, FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, FIG. 3 is an explanatory view of the mold 1 being removed, and FIG. 4 is a top view of a mold 11 of a reference example. 5 is a cross-sectional view taken along the line BB in FIG. 4, FIG. 6 is an explanatory view of the mold 11 in a removed state, FIG. 7 is an explanatory view of the moving means 25, and FIG. 8 is a top view of the mold 31 of the embodiment. 9 is a cross-sectional view taken along line CC in FIG. 8, FIG. 10 is a cross-sectional view taken along line DD in FIG. 8, and FIG.
[0022]
1-3 shows a basic configuration excluding the top plate of the present invention. In this case, the mold 1 is a mold for forming a cylindrical concrete product 0 whose ends are not closed. The mold 1 includes a cylindrical outer mold 2, a mold main body having a cylindrical inner mold 3 and a ring-shaped bottom mold 4 disposed on the inside thereof, and a pedestal 5 on which the mold main body is placed. Concrete is filled into a cylindrical space 7 (cavity) formed by the outer mold 2, the inner mold 3 and the bottom mold 4 of the mold body to produce a cylindrical concrete product.
[0023]
The outer mold 2 is formed in a cylindrical shape with an iron plate or an appropriate reinforcing member (not shown), and is divided into two vertically. The inner mold 3 is formed in a cylindrical shape with an iron plate or an appropriate reinforcing member (not shown), and is vertically divided into four divided portions 3a, 3a, 3b, and 3c. Two opposing divided parts 3 a and 3 a of the divided parts are connected by a moving means 6. The moving means can be appropriately selected from known means such as a turnbuckle, a clamp, an air cylinder, and a hydraulic cylinder. By operating the moving means 6, the divided portions 3a and 3a can move in the inner and outer directions. The remaining two divided portions 3b and 3c are also connected by the moving means 6. However, since the divided portion 3c is welded and fixed to the base 5 and the bottom mold 4, when the moving means 6 is operated, only the divided portion 3b is inside and outside. Move in the direction. The bottom mold 4 is formed by processing an iron plate or a flat bar into a ring shape, and is fixed to a pedestal 5. However, the bottom mold is not necessarily fixed to the pedestal. The pedestal 5 is processed into a circular shape using an appropriate material such as a steel material or an iron plate. However, the shape of the pedestal is not limited to a circular shape, and may be an arbitrary shape.
[0024]
The mold body is filled with concrete and, after curing, the mold is removed as shown in FIG. The outer mold 2 is removed by dividing it into two. The inner mold 3 operates the moving means 6 to shorten its length, and moves the divided portions 3a, 3a, 3b inward to reduce the diameter. And the product 0 is lifted with a crane etc. and taken out from a formwork. When the demolding is completed, the moving means 6 is actuated to increase its length, the dividing parts 3a, 3a, 3b are moved outward, and the mold is assembled by returning to the original state (FIG. 1). .
[0025]
The mold 11 in FIGS. 4 to 7 is a mold for molding the rectangular tubular concrete product 10 whose end is not closed. Thus, the present invention can be applied not only to the production of cylindrical concrete but also to the production of rectangular tubular concrete products, and to other tubular products of other shapes such as polygonal tubular shapes. The mold 11 includes a cylindrical outer mold 12, a mold main body having a cylindrical inner mold 13 and a ring-shaped bottom mold 14 disposed on the inside thereof, and a base 15 on which the mold main body is placed. Concrete is filled into a cylindrical space 27 (cavity) formed by the outer mold 2, the inner mold 13, and the bottom mold 14 of the mold body to produce cylindrical concrete.
[0026]
The outer mold 12 is formed in a square tube shape with an iron plate or an appropriate reinforcing member (not shown), the lower part of each side is hinged to the base 15 with a hinge, and the mold is opened so that each side is tilted downward. can do. The inner mold 13 is formed in a square cylinder shape with an iron plate or an appropriate reinforcing member (not shown), and is vertically divided into four divided portions 13a, 13a, 13b, and 13c. Two opposing divided portions 13a, 13a of the divided portions can be moved in the inner and outer directions by the moving means. Of the remaining two divided parts, the divided part 13b can be moved inward and outward by a hydraulic cylinder 25 as a moving means, and the divided part 13c is fixed to the base 5 and the bottom mold 4 by welding.
[0027]
The moving means of the division parts 13a, 13a is composed of one operating shaft 22 and two sets of clamping mechanisms 16. The operating shaft 22 is rotatably attached to a bearing piece 24 that is formed to protrude from the inner surface of the inner divided portion 13c, and is supported so as to be rotatable in the vertical direction. The clamp mechanism 16 includes a rotating piece 17 and a connecting member 18, and the rotating piece 17 is welded and fixed to the operating shaft 22 and rotates with the rotation of the operating shaft 22. The connecting member 18 has a rod shape with one end formed in a U-shape, the U-shaped tip is pivotally attached to the rotating piece 17 by a pin 19, and the other end is connected to the dividing portion 13 a to be moved. It is pivotally attached by the pin 20 through the protrusion piece 23 which protruded and formed in the inner surface of 13a. When the operating shaft 22 is rotated clockwise from the state of FIGS. 4 and 5, the two sets of rotating pieces 17 are simultaneously rotated, and the respective connecting members 18 and the divided portions 13a are drawn inward, as shown in FIG. Then, it stops when the operating shaft 22 enters the U-shaped portion of the connecting member. In FIG. 6, one of the connecting members is omitted. When the operating shaft is rotated counterclockwise from the state shown in FIG. 6, the two sets of rotating pieces 17 are simultaneously rotated, and the respective connecting members 18 and the dividing portions 13 a are moved outward to be provided on the rotating pieces. The outer side of the U-shaped portion of the connecting member comes into contact with the stopper 21 and stops, and the state shown in FIGS.
[0028]
As shown in FIG. 7, the hydraulic cylinder 25, which is a moving means of the dividing portion 13b, has a main body fixed to the pedestal 15 and a tip connected to a protruding piece 26 formed to protrude inside the dividing portion 13b. By contracting, the dividing portion 13b moves inward or outward.
[0029]
The bottom mold 14 is formed by processing an iron plate, a flat bar, or the like into a square ring shape, and is fixed to a pedestal 15. The pedestal 15 is processed into a rectangular shape using an arbitrary material such as various steel materials or iron plates.
[0030]
8 to 11 relates to an embodiment of the present invention, and is a mold for molding a cylindrical concrete product 30 whose one end is closed. The mold 31 includes a cylindrical outer mold 32, a cylindrical inner mold 33 disposed inside thereof, a ring-shaped bottom mold 44, a mold body having a top plate 36 for closing the upper opening of the inner mold, and a mold. It comprises a pedestal 35 on which the frame body is placed. A cylindrical concrete product is manufactured by filling concrete into a cylindrical space formed by the outer mold 32, the inner mold 33 and the bottom mold 34 of the mold body and the space 42 (cavity) including the top surface of the top plate 36. .
[0031]
The outer mold 32 is formed in a cylindrical shape with an iron plate or an appropriate reinforcing member (not shown), and is divided into two vertically. The inner mold 33 is formed in a cylindrical shape with an iron plate or an appropriate reinforcing member (not shown), and is vertically divided into four divided portions 33a, 33a, 33b, and 33c. Two opposing divided portions 33a, 33a of the divided portions can be moved in the inner and outer directions by the moving means. Of the remaining two divided portions, the divided portion 33b can be moved inward and outward by the moving means, and the divided portion 33c is fixed to the base 35 and the bottom die 34 by welding. The bottom die 34 is formed in a ring shape with an appropriate member such as an iron plate or a flat bar. The pedestal 15 is processed into a quadrangular shape using an arbitrary material such as various steel materials such as H-shaped steel or an iron plate.
[0032]
The top plate 36 has a disk shape, a reinforcing portion 36a is formed in the lower portion, and is supported by two support members 38 (H-shaped steel) erected from the pedestal 35. The outer diameter of the top plate 36 is smaller than the outer diameter of the upper end portion of the inner mold 33. A rubber ring 37 is attached to the outer peripheral portion of the top plate 36, and the outer diameter of the ring 37 is substantially the same as the outer diameter of the upper end portion of the inner mold 33.
[0033]
The moving means of the divided portions 33 a and 33 a facing each other includes two sets of the operating shaft 39 and the clamp mechanism 16. Each operating shaft 39 is rotatably mounted on a bearing piece projecting laterally from the support member 38, and is supported rotatably in the vertical direction. The lower end of the operating shaft 39 is connected to the horizontal shaft 40 via a bevel gear, and rotating the horizontal shaft 40 rotates the operating shaft 39. By doing in this way, an operation axis can be rotated from the outside of a formwork. The clamping mechanism 16 is the same as the clamping mechanism of the mold 11 and includes a rotating piece and a connecting member. The rotating piece is welded and fixed to the operating shaft 39 and rotates with the rotation of the operating shaft 39. The connecting member has a rod shape with one end formed in a U-shape, the U-shaped tip is pivotally attached to the rotating piece by a pin, and the other end is connected to the dividing portion 33a to be moved, and the inner surface of the dividing portion 33a It is pivotally attached by a pin through a projecting piece projecting from the pin. When the horizontal shaft 40 is rotated from the state of FIGS. 8 to 10 to rotate the operating shaft 39 in a predetermined direction, the rotating piece is rotated and the connecting member and the dividing portion 33a are drawn inward (FIG. 10). When the horizontal axis 40 is rotated in the reverse direction from the state shown in FIG. 10, the operating shaft and the rotating piece rotate in the reverse direction, and the connecting member and the dividing portion 33 a move outward, as shown in FIGS. Return to the state.
[0034]
The moving means of the dividing portion 33b is the same clamp mechanism 16 provided on the pedestal 35. In this case, the operating shaft 41 is pivotally attached to the pedestal, and one end of the connecting member is pivotally attached to a protruding piece projecting inside the dividing portion 33b. By rotating the operating shaft, the dividing portion 33b can be moved inward or outward.
[0035]
Concrete is filled in the space 42 of the mold body, and after curing, the mold is removed as shown in FIG. The outer mold 32 is removed by splitting it into two and removing it. The inner mold 33 rotates the horizontal shaft 40 and the operating shaft 41 to operate each clamp mechanism 16, moves the divided portions 33 a, 33 a, 33 b inwardly, and reduces the diameter. And the product 30 is lifted with a crane etc. and taken out from a formwork. At this time, since the outer diameter of the top plate 36 is smaller than the outer diameter of the inner mold 33, the product can be taken out. The ring 37 is usually taken out together with the product while attached to the product, but can be easily detached from the product because it is made of rubber. When the demolding is completed, the clamp mechanism 16 is operated in the reverse direction to move the divided portions 33a, 33a, 33b outward, return to the original state (FIGS. 8 to 10), and the ring 37 is moved to the outer periphery of the top plate 36. It only has to be attached to the part and assemble the formwork.
[0036]
Since the inner mold of the mold 31 has a reduced diameter, the concrete product does not require a drop gradient. That is, the inner peripheral surface of the product (the outer peripheral surface of the inner mold) can be made vertical. Although the top plate is not reduced in diameter, the outer diameter of the top plate is smaller than the outer diameter of the inner mold, so that the mold can be removed. In addition, since a ring made of an elastic body is attached to the outer peripheral portion of the top plate, a small annular step portion is not formed at the boundary with the inner peripheral surface inside the closed surface of the product.
[0037]
The present invention can employ any diaphragm mechanism instead of the inner diaphragm mechanism of the mold 31.
[0038]
In the present invention, a guide mechanism can be provided so as to move along a predetermined path when moving the inner mold division in the inner and outer directions. Various guide mechanisms are conceivable, such as providing a guide rail on the pedestal, or providing a link mechanism that restricts movement between the divided portions.
[0039]
【The invention's effect】
In the mold according to the present invention, the inner mold is divided into four parts, and at the time of demolding, at least three of them are moved inward to increase the amount of diameter reduction. And the inner surface of the product can be enlarged, and the demolding work becomes easy. Also, unlike the folding type, the inner mold has no hinge part, so no special cleaning work is required and the dimensional accuracy is excellent.
[0040]
By fixing one of the divided parts of the inner mold to the pedestal, the rigidity of the formwork is increased and the dimensional accuracy of the product is improved. Since it does not fall apart, the mold can be easily removed and assembled.
[0041]
As a moving means for moving the two opposing divided portions in the inner and outer directions, one or two operating shafts disposed in the inner mold so as to be rotatable in the vertical direction, and the two opposing operating shafts. When a clamp mechanism installed between the divided portions is employed, the divided portions can be easily and reliably moved with a simple mechanism. In particular, when one operating shaft is provided and a clamp mechanism is installed between this and the two divided parts,
By rotating one operating shaft, the two opposing divided portions can be moved simultaneously in the inner and outer directions, so that the inner mold diameter reducing operation and the diameter expanding operation can be further facilitated.
[0042]
Since the inner mold of the mold for molding a cylindrical concrete product with one end closed according to the present invention has a reduced diameter, the concrete product does not require a drop gradient. By attaching a ring made of an elastic material such as rubber to the outer periphery of the top plate, it is possible to prevent a step from being formed around the inside of the closed surface of the product.
[Brief description of the drawings]
FIG. 1 is a top view of a mold 1;
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is an explanatory diagram of a demolding state of the mold 1;
FIG. 4 is a top view of the mold 11;
FIG. 5 is a cross-sectional view taken along line BB in FIG.
FIG. 6 is an explanatory diagram of a mold 11 in a removed state.
7 is an explanatory diagram of a moving unit 25. FIG.
8 is a top view of the mold 31. FIG.
9 is a cross-sectional view taken along line CC in FIG.
FIG. 10 is a cross-sectional view taken along the line DD in FIG.
FIG. 11 is an explanatory diagram of a demolding state of the mold 31.
[Explanation of symbols]
0 Concrete product 1 Formwork 2 Outer mold 3 Inner mold 4 Bottom mold 5 Base 6 Moving means 7 Space 10 Concrete product 11 Formwork 12 Outer mold 13 Inner mold

Claims (5)

A tubular outer mold, a mold body having a cylindrical inner mold and a ring-shaped bottom mold disposed inside thereof, and a pedestal on which the mold body is placed, the outer mold and the inner mold And a cylindrical concrete product forming mold for producing cylindrical concrete by filling concrete into a cylindrical space formed by a bottom mold,
The inner mold is divided into four divided parts in the vertical direction, moving means for linearly moving the two divided parts facing each other in the inner and outer directions, and the remaining two divided parts Moving means for linearly moving at least one of the portions in the inner and outer directions is provided , and a top plate for closing the upper opening of the inner mold is supported by a support member standing on the pedestal. The outer diameter of the top plate is smaller than the outer diameter of the upper end portion of the inner mold, and the outer diameter of the top plate is made of an elastic body such as rubber, and the outer diameter is substantially equal to the outer diameter of the upper end portion of the inner mold. Molded form for cylindrical concrete product, characterized by mounting equal rings   2. The formwork for forming a cylindrical concrete product according to claim 1, wherein one of the remaining two divided portions is fixed to the pedestal.   The mold according to claim 1 or 2, wherein the moving means for moving the two opposing divided portions in the inner and outer directions are two operating shafts disposed in the inner mold so as to be rotatable in the vertical direction, Cylinder mechanism for forming a cylindrical concrete product, characterized in that it is a clamp mechanism constructed between each operating shaft and each divided portion.   The working frame according to claim 1 or 2, wherein the moving means for moving the two opposing divided portions in the inner and outer directions is arranged to be rotatable in the vertical direction at the central portion of the inner die. And a mold structure for forming a cylindrical concrete product, characterized in that each is a clamp mechanism constructed between the operating shaft and the two opposed divided portions.   5. The mold according to claim 3, wherein the clamping mechanism includes a rotating piece and a bar-shaped connecting member having one end having a U-shape, and the rotating piece is fixed to the operating shaft to rotate the operating shaft. And the connecting member has a U-shaped tip pivotally attached to the pivot piece, and the other end pivotally attached to the divided portion to be moved. Forming mold for products

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