JPH0822538B2 - Formwork equipment for centrifugal molding of concrete hollow polygonal tubes - 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 for centrifugal molding of concrete hollow polygonal pipes, and more particularly to a hollow multi-walled device having a polygonal outer shape and a polygonal inner shape substantially similar to the outer shape. The present invention relates to a mold device for centrifugal molding of rectangular tubes.

[0002]

2. Description of the Related Art A formwork device used when centrifugally forming a hollow concrete polygonal pipe having a polygonal outer shape and a polygonal shape substantially similar to the outer shape is constructed to have a rectangular cross section. Japanese Patent Application Laid-Open No. 2-8011 discloses a device composed of a box-shaped mold, a disk mounted so as to match the center axis of the mold, and a rod that passes through the mold in the axial direction. Further, a cylindrical body having an appropriate length corresponding to the outer peripheral shape of the perforated pipe, and a plurality of substantially rod-shaped through-hole forming frames attached along both ends of the cylindrical body along the axial direction of the cylindrical body. An apparatus composed of a member and a pair of end plates having concrete inlets of appropriate diameters provided on both end faces of a tubular body is disclosed in Japanese Patent Laid-Open No. 60-
It is proposed as Japanese Patent No. 165208.

[0003]

By the way, in the apparatus described in Japanese Patent Application Laid-Open No. 2-8011 described above, the rod body is inserted in the mold and the rod body is attached by utilizing centrifugal force. Since it fits in the corners of the formwork, there is no need to lock it inside the formwork, making it easy to pull out after placing concrete, but the rod has a positional relationship with the formwork. The inner shape is determined only by stopping it so that it does not change, and the position of the rod changes with each molding when the rod can move freely within the frame, so that the product with a uniform inner shape is obtained. In addition to the problem that it is difficult to mold, there is a risk that the rod will pop out of the frame.

Further, a member for fixing the member for determining the inner shape of the product at a predetermined position with respect to the mold to solve the above-mentioned problems has been proposed as the above-mentioned JP-A-60-165208. However, since the through-hole forming frame member in the invention is fixed across the end plates (wheels) provided at both ends of the tubular body, the end plates are removed when the product is taken out after molding. Needless to say, the inner frame attached to the end face plate must be disassembled, which causes problems in productivity and workability.

The present invention has been made in view of the above-mentioned problems of the prior art, and its object is to make the outer shape polygonal and the inner shape substantially similar to the outer shape. An object of the present invention is to provide a centrifugal molding frame device capable of molding a uniform hollow polygonal tube with high productivity and workability.

[0006]

The technical means taken by the present invention to achieve the above object is concrete formed by centrifugal molding to have a polygonal shape on the outer side and a polygonal shape on the inner side substantially similar to the outer shape. A formwork device for forming a hollow polygonal tube made of a hollow polygonal product, the outer formwork determining the outer shape of a hollow polygonal product, and the hollow polygonal shape arranged inside the outer formwork in the axial front-rear position. A control ring that determines the pipe thickness and pipe length of the product, an inner formwork that is placed inside the control rings before and after that and that determines the inner shape of the hollow polygonal product, and the inner formwork An inner formwork connecting ring that movably supports a plurality of frame bodies that are movable in the radial direction and that fixes and fixes the frame bodies to predetermined positions in the radial direction, and is fixed to the axial front and rear positions of the outer formwork. It is composed of wheels that transmit rotational force to the outer formwork And it features.

The outer frame is a rectangular tube body having front and rear ends opened, and the tube body may be a dividable one formed by connecting and connecting a plurality of members in the circumferential direction, or an integral body which is not divisible. It may have a structure. The front and rear restricting rings arranged inside the outer mold form are made of rubber packing or the like on the outer peripheral face contacting the inner face of the outer mold form and the inner peripheral face contacting the plurality of frame bodies forming the inner formwork, respectively. A sealing material is attached to prevent the material charged into the outer mold from leaking out.
Further, the restriction ring may be held at a predetermined position inside the outer mold, or the mounting position may be adjustable in the axial direction inside the outer mold.

As means for connecting and integrating a plurality of frame members with the inner frame connecting ring, the screw rods fixed to the side ends of the frame members are inserted into the guide elongated holes of the ring and protruded from the ring. Means for screwing and fastening a nut to the threaded rod portion to integrate the nuts can be given. In addition, the work of pushing out a plurality of frame bodies constituting the inner mold in the radial direction outward and crimping to the inner peripheral surface of the restriction ring, or pulling the inner frame inward in the radial direction to separate from the inner peripheral surface of the restriction ring The body may be operated individually, or the whole frame or a plurality of frames may be divided and operated simultaneously.

[0009]

According to the above means, the restriction rings are arranged inside the outer mold at intervals in the axial direction, and the inner mold formed of a plurality of frame bodies is provided over the insides of the restriction rings before and after the restriction rings. Although the plurality of frame bodies are arranged, the plurality of frame bodies are supported by the inner mold frame connecting ring, and the frame bodies are fastened to the inner mold frame connecting ring in a state of being pressed against the restricting ring. The restriction ring and the inner formwork are integrated to define a space for molding the product. After the centrifugal molding, the inner molds are connected by the inner mold connecting ring, so that the plurality of frame bodies forming the inner mold are integrally extracted from the outer mold, and subsequently the molded product is formed. Can be taken out. Also, the tube thickness of the molded product can be changed by replacing the above-mentioned restriction ring with one having a different thickness.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an entire formwork apparatus for centrifugally forming a rectangular hollow tube. In the figure, 1 is a square tube with front and rear ends open. -Shaped outer formwork, 2 is a restriction ring arranged inside the outer formwork 1, 3
Is an inner formwork composed of a plurality of frame bodies arranged inside the front and rear regulation rings 2, 4 is an inner formwork connecting ring, and 5 is a wheel fixed to the front and rear ends of the outer formwork 1 in the axial direction. is there.

The outer mold 1 is made of a rigid metal flat plate and is formed into an L-shaped cross section. The outer mold members 1a and 1b are combined so that the ends thereof are superposed.
It is formed into a quadrangular tubular shape that can be fastened and disassembled by means of, and a flange 7 for connecting and fixing the wheel 5 is formed outward at the axial front and rear ends of the tubular body. Although not shown in the illustrated embodiment, reinforcing beams for preventing deformation, warpage, etc. are arranged vertically and horizontally on the outer surfaces of the outer frame members 1a and 1b. Further, a knock guide pin and a guide pin hole may be provided at appropriate places in order to smoothly perform the alignment when the outer formwork members 1a and 1b are combined.

The restriction ring 2 arranged inside the outer mold 1 configured as described above determines the wall thickness (tube thickness) of the pipe body to be molded, and the outer shape of the outer mold 1 is different from that of the outer mold 1. It is formed in a quadrangular shape that is in close contact with the inner surface, the inner shape is also formed to be substantially similar to the outer shape, and at the center of each side of the ring, for positioning the frame body arranged inside the restriction ring 2. The convex portion 8 is formed so as to project. Further, the restriction ring 2 is supported at a predetermined position with respect to the outer mold 1 described above, and in order to be separated from the outer mold 1, the restricting ring 2 is engaged with the outer peripheral surface of the ring 2 with a triangular cross section. Groove 9
The positioning pin 10 which is notched and which is fitted and engaged in the engaging groove 9 is attached so as to project inside the outer formwork 1. Further, a sealing material 11 such as a rubber packing is attached to the outer peripheral surface and the inner peripheral surface of the restriction ring 2, whereby the joint surface between the inner surface of the outer mold 1 and the outer surface of the inner mold 3 is tightly sealed, The kneaded concrete does not leak out.

The inner mold 3 determines the inner shape of the rectangular tubular body to be molded, and is composed of long frames 3a, 3b, 3c and 3d having a right-angled triangular cross section. Body 3a ~
Screw rods 12 are fixedly projectingly provided on both ends in the axial direction of 3d so that the rods can be connected to and supported by the inner frame connecting ring 4 by using the screw rods 12. The screw rod 12 is provided with a rotation stopper portion 13 having a square cross section on the base side thereof, and the rotation stopper portion 13 is fitted into a guide elongated hole formed in the inner frame connecting ring 4 to form a frame body. The corners 3a to 3d each have a right angle and are guided in the radial direction with the outer mold 1 facing the corners. Further, the frame bodies 3a to 3d forming the inner formwork 3 are located at predetermined positions on respective sides of the frame bodies 3a to 3d which are joined to the inner surface of the regulation ring 2.
A stopper 14 is fixedly provided so as to prevent axial movement of 3d to 3d.
It is possible to prevent the inner formwork 3 from rattling in the axial direction by engaging with the outer edge of the.

The inner formwork connecting ring 4 is formed in a shape smaller than the inner shape of the restriction ring 2 by using a metal plate having rigidity, and an opening 15 serving as a material inlet is opened in the center thereof. In the flat plate portion around the opening 15, guide long holes 16 are diagonally formed at positions corresponding to the screw rods 12 provided at the side ends of the frame bodies 3a to 3d constituting the inner formwork 3 described above.
Is formed, the screw rods 12 of the frame bodies 3a to 3d are fitted into the guide elongated holes 16 and the rotation stopping portions 13 are engaged with each other, whereby each frame body has a predetermined correspondence with the outer formwork 1. It is held movably in the radial direction while maintaining the relationship. The inner frame 3 is connected and fixed to the inner frame connecting ring 4 with a screw rod.
It is performed by screwing and fastening a nut 18 to a 12 via a collar 17.

The wheel 5 has a circular flat plate portion 5a having an opening having the same shape as the opening at the front and rear ends of the outer mold 1 in the axial direction, and has an annular flange portion 5b on the outer periphery. 5a is joined to the flange 7 of the outer formwork 1 and bolts and nuts 19
Fasten and integrate with.

Next, a molding method using the above-mentioned mold apparatus will be briefly described. First, the outer mold 1, the restriction ring 2,
The inner mold 3, the inner mold connecting ring 4 and the wheels 5 are assembled and integrated to complete the formwork device. In the assembly, the restriction ring 2 is provided inside the outer formwork 1 at a predetermined interval in the front-rear direction (of the molded product). After fixing the length of the inner mold 3, the inner mold 3 and the inner mold connecting ring 4 are assembled inside the outer mold 1 inside the front and rear restriction rings 2 to form the inner mold 3. Frame 3a to
3d is moved to the outside in the radial direction along the guide elongated hole 16 of the inner formwork connecting ring 4 to engage with the predetermined position of the restriction ring 2,
In this state, the nut 18 is screwed and fastened to the screw rod 12, so that the outer frame 1, the restriction ring 2, and the inner frame 3 are integrated via the inner frame connecting ring 4. Then, the outer shape and the inner shape of the molding tube are determined by the outer mold 1 and the inner mold 3, and the front and rear regulating rings 2 and the inner mold 3 which is fixedly bonded to the inner side thereof.
The wall thickness (tube thickness) of the forming pipe is determined by and the mounting distance between the front and rear restricting rings 2 determines the pipe length of the forming pipe, and further the plurality of frame bodies 3a to 3d forming the inner mold 3 are formed. In the fixing state, the gap A generated between the frame bodies serves as an inflow portion of the charged material.

The formwork apparatus completed as described above is placed on the rotary wheel 20 of the pipe making machine, and the wheelframe 5 contacting the rotary wheel 20 rotates the moldwork apparatus to rotate the formwork apparatus. Pour the concrete that was previously kneaded into. The poured concrete flows into the space between the outer mold 1 and the inner mold 3 through the gap A formed in the inner mold 3, and the material is spread to every corner of the partitioned molding space by the centrifugal force. Then, by applying a predetermined centrifugal force, the water in the concrete is squeezed out to the inner surface of the inner mold and the concrete is physically hardened.
At this stage, the nut 18 that fastens the inner frame 3 to the inner frame connecting ring 4 is loosened to move the frame bodies 3a to 3d inward in the radial direction to separate them from the restriction ring 2 and the inner surface of the molding pipe, The frame 3 and the inner formwork connecting ring 4 are pulled out together in the axial direction and pulled out from the outer formwork 1, and the one without the inner formwork 3 is steam-cured and chemically cured, and then the wheel 5 and the outside The mold 1 is separated and the molded tube (product) B is taken out. The inner mold 3 can of course be removed after steam curing.

When the inner mold 3 is attached to or removed from the outer mold 1, the frames 3a to 3d are moved in the radial direction, but the moving operation may be performed individually on the frame. 5
As shown in, a turnbuckle type movement assisting tool 21 is laid across the collar 17 of the frame body 3a and the frame body 3c (or the frame body 3b and the frame body 3d) which are diagonally opposed to each other, and in that state, Rotating cylinder
By rotating 22 the engaging rods 23 screwed on both sides of the rotary cylinder are projected or pulled in, whereby the diagonally opposed frame bodies can be simultaneously moved.
The four frame bodies may be moved simultaneously by using a hydraulic device or the like.

[0019]

According to the formwork apparatus of the present invention, the outer formwork which determines the outer shape of the hollow polygonal product and the tube thickness of the hollow polygonal product which is arranged at the axial front and rear position inside the outer formwork. And an inner formwork consisting of a plurality of frame bodies arranged inside the control ring before and after the control ring to determine the pipe length and determining the inner shape of the hollow polygonal product, and the inner formwork. An inner formwork connecting ring that supports a plurality of frame bodies so as to be movable in the radial direction and that fixes and fixes the frame bodies in predetermined positions in the radial direction, and an outer formwork that is fixed to axial front and rear positions of the outer formwork. Since it is configured with wheels that transmit rotational force to
The inner formwork that determines the inner shape of the hollow polygonal product and the restriction ring that determines the wall thickness are engaged and integrated with the outer formwork via the inner formwork connecting ring to ensure a molding space that does not change. As a result, a hollow polygonal product having a stable shape and a uniform wall thickness can be formed.

In addition, since the plurality of frame bodies forming the inner formwork are connected and held by the inner formwork connecting ring and are supported so as to be movable in the radial direction, the inner formwork may be assembled to the outer formwork. The work of pulling out the inner mold from the outer mold can be performed without disassembling the outer mold, and it is possible to provide a mold apparatus having high productivity and workability.

Further, when the restriction ring arranged inside the outer mold is movable and adjustable, the molded products having different lengths can be easily molded by changing the position of the restriction ring.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a formwork apparatus of the present invention.

2 is a partially cutaway front view of the formwork device shown in FIG. 1. FIG.

FIG. 3 is a vertical sectional view taken along line (3)-(3) of FIG.

FIG. 4 is a vertical sectional view taken along line (4)-(4) of FIG.

FIG. 5 is a front view showing a state where a molded product is removed.

FIG. 6 is an enlarged cross-sectional view showing a connecting portion between the inner mold and the inner mold connecting ring.

[Explanation of symbols]

 1 ... Outer formwork 2 ... Control ring 3 ... Inner formwork 4 ... Inner formwork connection ring 5 ... Wheels 3a to 3d ... Frame body

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsuneo Takahashi 4-30-5 Ryogoku, Sumida-ku, Tokyo Teihu Co., Ltd. (72) Inventor Toshiyuki Sato 8-7 Gamo, Miyagino-ku, Sendai City, Miyagi Stock Within the company Mugen Sato (56) References JP-A-2-301406 (JP, A) JP-A-2-8011 (JP, A) JP-A-4-319406 (JP, A) Jitsuko 2-34006 (JP, Y2)

Claims (2)

[Claims] 1. A formwork apparatus for forming a concrete hollow polygonal tube, which has a polygonal shape on the outer side and a polygonal shape on the inner side which is substantially similar to the outer shape by centrifugal molding. The outer formwork that determines the outer shape, the control ring that is placed inside the outer formwork in the axial front-rear position to determine the pipe thickness and pipe length of the hollow polygonal product, and the control ring that is placed before and after the control ring The inner formwork consisting of a plurality of frame bodies that determines the inner shape of the hollow polygonal product, and the plurality of frame bodies that form the inner formwork are movably supported in the radial direction and Centrifugal molding die, which comprises an inner frame connecting ring that is fixedly fixed at a predetermined position in the radial direction, and wheels that are fixed to axially front and rear positions of the outer frame and that transmit rotational force to the outer frame. Frame device. 2. The mold apparatus for centrifugal molding according to claim 1, wherein the restriction ring is attached so as to be movable and adjustable inside the outer mold.