JP2553334Y2 - Concrete product mold equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold device used for producing concrete products such as box culverts.

[0002]

2. Description of the Related Art For the production of hollow concrete products such as box culverts, a mold apparatus combining an outer mold and an inner mold has been conventionally used. In the production by the mold device, the outer mold and the inner mold are constructed, the fresh concrete is injected and filled, and the mold is released after solidification and curing. It has been a conventional problem to improve the efficiency of mold construction and mold release operations.

The applicant of the present application has already proposed a mold apparatus which facilitates the construction and release of such a mold and enables the production of a box culvert having a good surface profile.
This type device was published as Japanese Utility Model Publication No. 3-49849.

FIG. 10 is a longitudinal sectional view showing a main part of the mold apparatus described in this publication. The four frame members 50 constituting the inner mold are connected to each other by joints 51 which elastically deform both ends. I have. These joints 51 are arranged over the entire length of the frame member 50 in the longitudinal direction, and have a hollow structure inside. The joint 51 is connected to a hose 52 for supplying compressed air.

[0005] In this mold device, when the inner mold is constructed as shown in the figure, the joint 51 is expanded by supplying compressed air to the joint 51. As a result, the frame member 50 is constrained to the construction position of the inner mold, and
The outer surface of 1 itself is the creation surface for receiving ready-mixed concrete.

[0006] When air is released from the joint 51, it contracts and deforms so that the distance between the ends of the frame member 50 becomes shorter. Therefore, the four frame members 50 can be moved inward away from the product, thereby releasing the mold.

[0007]

However, after filling with ready-mixed concrete, a large load is also applied to the joint 51. For this reason, when the pressure of the compressed air is lower than the appropriate value or when the joint elasticity is severely deteriorated,
There is a high possibility that the joint 51 is deformed so as to be pushed inward.

When the joint 51 is deformed as described above,
The concrete created by the joint 51 has a shape bulging inward. For this reason,
The product deviates from the design specification, causing a problem in manufacturing.

The problem to be solved in the present invention is that a good mold can be manufactured by preventing the joint from being deformed at the time of filling the ready-mixed concrete, while keeping the configuration for simplifying the mold release using the elastically deformable joint. It is to be.

[0010]

SUMMARY OF THE INVENTION According to the present invention, an inner mold for forming a hollow portion such as a rectangular or circular cross section of a hollow concrete product is formed by a plurality of frame members shorter than the width or perimeter of one side of the generating surface. A mold device in which each of these frame members is connected by an elastically deformable joint, and the outer peripheral surface of the joint can form a creation surface of a product together with the connected frame member; A movable body is provided between the adjacent frame members inside and adjacent to each other, and an end face of the movable body is connected to the joint so that the movable body can be moved in and out of the adjacent frame members. A link mechanism is connected between the movable body and the frame member, and a tube that can be expanded and contracted by the supply of a fluid from the outside is provided between the frame members, and further interlocked with the expansion and contraction of the tube. Before Via a link mechanism, characterized by comprising a movable movable member and the frame member outer and inner respectively.

[0011]

Since the frame material is shorter than the width or circumference of one side of the creation surface of the product, if these are moved outward by expanding the tube, the ends of adjacent frame materials are connected to each other. The elastically deformable joint is deformed together with the frame to form the creation surface of the product. At this time, since the movable body is connected to the joint, the inside of the joint is lined with the end face of the movable body, and it is possible to suppress the deformation of the joint even when receiving the pressure at the time of filling the ready-mixed concrete. .

Further, when the tube contracts, the movable body moves inward in conjunction therewith, so that the joint is drawn in between the frame members, and the frame member also moves inward at the same time. Thereby, the whole mold can be contracted and deformed from the creation surface of the product, and the mold can be released.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The inner mold has four frame members as shown in FIG. 10 of the prior art, and an outer frame which can be disassembled at intervals around these frame members. The whole is composed. Then, a hollow product such as a box culvert is produced by injecting and filling the fresh concrete into a gap between the inner mold and the outer mold.

FIG. 1 is a longitudinal sectional view showing a main part of a joint portion of an inner frame material for producing a square hollow product. In addition, 4
Both ends of each of the frame members also have the same joint structure as in this figure, and only one portion will be described in the embodiment.

In the drawing, frame members 1 and 2 adjacent to each other
At the circumferential ends of the generating surfaces 1a,
2a is provided. Further, link rods 3 are arranged at both ends in the axial direction when the frame members 1 and 2 are constructed and on the inner side, and these frame members 1 and 2 are connected to each other. The link rod 3 is arranged such that the longitudinal axis thereof is oriented at 45 ° when the frame members 1 and 2 are constructed, and the pins 1b and 3b are respectively inserted into long holes 3a and 3b opened at both ends thereof. 2b
It must be pivoted through.

At the circumferential ends of the frame members 1 and 2, joints 4 made of elastically deformable rubber or the like are used.
Is provided. This joint 4 has a length (length in the depth direction in the figure) equal to the creation space created by the frame members 1 and 2. A flange 4a having a slightly higher hardness at both ends is provided.
Respectively.

Further, between the ends of the frame members 1 and 2,
A movable block 5 for lining the joint 4 to reinforce the joint is incorporated.

FIG. 2 is a cross-sectional view taken along line AA of FIG. 1 and is a view showing a connecting structure between the movable block 5 and the link rod 3.

A pair of link rods 3 located at both axial ends of the frame members 1 and 2 are integrated by a stay 3c. That is, the stay 3c is configured to run in the space between the ends of the frame members 1 and 2 in the longitudinal direction, and to have the link rods 3 at both ends.

On the other hand, the movable block 5 has a hollow structure,
An opening 5a is opened in the side wall in the longitudinal direction, and a stay 3c is inserted from the opening 5a to partition the inside of the movable block 5. Therefore, the movable block 5 is movable in the direction of the arrow shown in FIG. Further, tapered surfaces 5b and 5c are provided on the surfaces of the movable block 5 facing the frame members 1 and 2, respectively. When the frame members 1 and 2 are constructed as shown in FIG. 1, these tapered surfaces 5b and 5c are provided. Can be taperedly fitted to the seating surfaces 1c, 2c of the frame members 1, 2.

The surface on which the movable block 5 faces outward is a flat pressure receiving surface 5d so as to receive the joint 4 over a wide range. Then, the joint 4 is joined to the movable block 5 by the pin 4c penetrating the pressure receiving surface 5d. Note that a plurality of pins 4c are arranged so as to be located on the center line in the width direction of the pressure receiving surface 5d, and the joints 4 are integrated so as to make line contact.

The movable block 5 is moved by two construction tubes 6 and a release tube 7 incorporated therein. These construction and release tubes 6,7
Is a rubber material which is elastically deformable.

The construction tube 6 is arranged such that one end face abuts the outer face of the stay 3c and the other end face abuts the inner wall of the movable block 5 on the pressure receiving face 5d side.
Then, hard seats 6a and 6b are formed on both end surfaces, and these are abutted against the stay 3c and the inner wall of the movable block 5, respectively.

On the other hand, the release tube 7 is incorporated between the outer surface of the stay 3c and the inner wall on the bottom side of the movable block 5, and seats 7a and 7b are formed on both end surfaces.

These construction and release tubes 6, 7
Are connected to hoses 6c and 7c, each of which can withstand high pressure. These hoses 6c and 7c connect the flow passages to a compressor (not shown) arranged separately from the outside of the mold device by another system. A switching valve and an air release valve for independently supplying compressed air to the construction and release tubes 6 and 7 are provided in this flow path system, and the construction and release tubes 6 and 7 are provided. 7 can be separately operated to supply and exhaust air.

In the above configuration, when air is evacuated from the mold release tube 7 and compressed air is supplied only to the construction tube 6, the construction tube 6 is moved outward with respect to the stay 3c as shown in FIG. The movable block 5 also moves outward. For this reason, the pressure receiving surface 5d
Is held at a position continuous with the generating surfaces 1a and 1b as shown in the figure, and the back surface thereof is lined with the pressure receiving surface 5d of the movable block 5.

When the joint 4 is maintained in the state shown in FIG. 1, the joint 4 is reinforced by the movable block 5 even when the space between the joint 4 and the outer mold (not shown) is filled with fresh concrete. Therefore, the inward bending deformation is suppressed. Therefore, the inner wall of the product after release does not bulge inward, and a product with good design specifications can be obtained.

Next, when the mold is released, air is released from the construction tube 6 and compressed air is supplied only to the release tube 7. Since the release tube 7 has one end abutting on the inner surface of the stay 3c, when the tube 7 expands, the movable block 5 moves inward as shown in FIG.

Such a movement of the movable block 5 has only one end connected to the elastically deformable joint 4 and has a degree of freedom with respect to the generating surfaces 1a and 2a of the frame members 1 and 2. is there. Then, the joint 4 is also elastically deformed inward, and the tapered surfaces 5b, 5c also move inward, thereby eliminating the action force for pushing the seating surfaces 1c, 2c of the frame members 1, 2 outward. Therefore, the frame members 1 and 2 also contract inward, and the frame members 1 and 2 are separated from the inner wall of the solidified product.

After the above operation and the release of the outer mold, the frame material 1,
The release operation is completed by extracting the product from the two and the other two frame members.

FIGS. 4 to 6 are longitudinal sectional views of a main part showing another embodiment. The same members as those in the previous example are designated by the same reference numerals, and detailed description thereof will be omitted.

A joint 4 that can be elastically deformed is provided between the ends of the frame members 1 and 2 as in the previous example. On the back surface of the joint 4, a movable bar 8 is
Join by c. The movable bar 8 has a length extending over the entire length of the frame members 1 and 2 in the axial direction, similarly to the movable block 5 in the previous example, and has a shape lining the back surface of the joint 4.

As shown in FIG. 5, the movable bar 8 has two link rods 9a, 9
b, 9c and 9d. These link rods 9a to 9d constitute a parallel link mechanism, and can move the movable bar 8 in the direction of the arrow in FIG.

Further, between the ends of the frame members 1 and 2,
Two tubes 10, 11 are arranged. The seats 10a, 11a on one end surfaces of the tubes 10, 11 have fixed ends joined to the fixed seats 1d, 1e of the frame members 1, 2, respectively. Also, seats 10b, 1 on the other end surfaces of the tubes 10, 11
1b is joined to a holding plate 12 using a steel plate or the like, and tubes 10 and 11 are connected through the holding plate 12.
Are connected.

Each of the tubes 10 and 11 has a hose 1
0c and 11c are connected, and these are connected to a compressor by a common flow path. Then, when compressed air is supplied to both tubes 10 and 11 by the operation of the compressor, a state as shown in FIG. 4 is obtained, and the joint 4 is connected to the generating surfaces 1a and 2a to form an inner mold.

Here, when air is evacuated from the tubes 10, 11, these tubes 10, 11 have no action force to push the frame members 1, 2 outward, and the tubes 10, 11 gradually contract. Then, at the time of construction in FIG. 4, the connecting contact point with the movable bar 8 is located on the inner side (center side of the inner mold) than the connecting contact point with the frame members 1 and 2 of each link rod 9 a to 9 b. Therefore, these link rods 9a and 9b exert an acting force to push the movable bar 8 inward. Therefore, as the tubes 10 and 11 contract, the movable bar 8 moves inward as shown in FIG. 6 and deforms so that the space between the frame members 1 and 2 becomes narrower. At the same time, the joint 4 is deformed by the movement of the movable bar 8 so as to be drawn between the frame members 1 and 2.

As described above, the built inner frame members 1 and 2 move inward, and the joint 4 is also pulled inward, and can be separated from the inner wall of the cured product. The mold is released.

Further, the contracted tube 10 shown in FIG.
When compressed air is supplied to 11, they expand and push the frame members 1, 2 in directions away from each other. Thereby, the frame members 1 and 2 are moved so as to assume the construction posture shown in FIG.
Move outward due to the displacement of the link rods 9a to 9d.
Therefore, the frame members 1 and 2 are shifted to the outside and the joint 4 is subjected to the tension deformation, and the frame members 1 and 2 and the joint 4 are set to the construction posture as shown in FIG.

After the inner mold is constructed, the joint 4 is lined with the movable bar 8, so that the movable bar 8 can receive the pressure at the time of injecting and filling the ready-mixed concrete as in the previous example. The deformation of the joint 4 can be suppressed. Therefore, the inner wall of the concrete product to be created does not bulge inward, and a good product can be obtained.

7 to 9 are views showing still another example. FIG. 7 is a longitudinal sectional view of a main part of the frame members 1 and 2 as viewed in the axial direction, and FIGS. 8 and 9 are FIGS. BB line and CC
FIG.

The frame members 1 and 2 have an axial length of, for example, about 2 m corresponding to the length of the product, and two ribs 1f and 2f are formed on the inner wall thereof at regular intervals. In the illustrated example, the ribs 1f and 2f are located at the ends of the frame members 1 and 2, and these ribs 1f and 2f are connected to two link rods 3.
And the pins 1b and 2b.

The two link rods 3 are connected to the rib 1
f, 2f, and a stay 3c is provided.
Are provided with a construction tube 6 and a release tube 7, respectively. The movable block 5 has an opening 5
It is movable with respect to the link rod 3 using a
A joint 4 is provided at the tip.

The distal end of the movable block 5 has a length equal to the axial length of the frame members 1 and 2, and is used only for the portions provided with the ribs 1 f and 2 f for the construction and release tubes 6. 7
Is incorporated. That is, in the examples of FIGS. 1 to 3, the link rods 3 are provided at both ends in the axial direction of the frame members 1 and 2 and are connected by one stay 3c. The movable block 5 is movable by storing a spherical tube at a position where the movable block 5 is to be moved.

Other configurations are the same as those in the examples of FIGS. 1 and 3, and the movement of the movable block 5 is similarly performed by supplying and discharging air to the construction tubes 6 and 7.

Although the embodiment has been described as a square box culvert mold device, the structure of the present invention can be applied to a mold device for a circular concrete pipe or other concrete product having an opening shape. Also, instead of moving the movable block 5 with compressed air, a fluid such as hydraulic oil or water can be used.

[0046]

[Effect of the Invention] In the present invention, a plurality of frame members are connected to each other by an elastically deformable joint so that the joint can be used as a creation surface. By easily folding, the mold can be easily released, and the workability is improved.

Further, since the joint is lined with the movable body, the load when the ready-mixed concrete is filled can be received by the movable body, and the inward deformation of the joint can be suppressed. For this reason, the inner wall of the product to be created does not bulge inward, and a concrete product having a good surface shape can be obtained.

[Brief description of the drawings]

FIG. 1 is a view showing a main part of a mold device according to the present invention, and is a longitudinal sectional view when a frame material is constructed.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a vertical cross-sectional view of a main part when a release position is set by a supply / discharge operation of compressed air to / from a tube.

FIG. 4 is a longitudinal sectional view of a main part showing another embodiment using a link rod and a movable bar.

FIG. 5 is a longitudinal sectional view of a main part showing a connection structure between a link rod and a movable bar in the example of FIG. 4;

FIG. 6 is a longitudinal sectional view of a main part when the release posture is set in the example of FIG. 4;

FIG. 7 is a longitudinal sectional view of a main part showing an example in which a tube is incorporated by using a space between ribs of a frame member.

FIG. 8 is a sectional view taken along line BB of FIG. 7;

FIG. 9 is a sectional view taken along line CC of FIG. 7;

FIG. 10 is a longitudinal sectional view showing the whole of a conventional mold device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame material 2 Frame material 3 Link rod 4 Joint 5 Movable block 6 Construction tube 7 Release tube 8 Movable bar 9a, 9b, 9c, 9d Link rod 10 Tube 11 Tube 12 Holding plate

Claims (1)

(57) [Scope of request for utility model registration] 1. An inner mold for creating a hollow portion such as a rectangular or circular cross section of a hollow concrete product is a combination of a plurality of frame materials shorter than a width or a perimeter of one side of a creation surface. A mold device in which each is connected by an elastically deformable joint, and the outer peripheral surface of the joint is capable of forming a creation surface of a product together with the connected frame material;
A movable body is provided between the adjacent frame members inside the joint and an end face of the movable body is connected to the joint, and the movable body is moved inward and outward with respect to the adjacent frame members. An enabling link mechanism is connected between the movable body and the frame member, and a tube that can be expanded and contracted by supplying a fluid from the outside is provided between the frame members. A concrete product mold apparatus capable of moving the movable body and the frame member outward and inward via the link mechanism in conjunction with each other.