JP3295495B2 - Inner form device for molding hollow rectangular concrete bodies - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner frame device used for centrifugally forming a hollow rectangular cross section concrete body.

[0002]

2. Description of the Related Art In a recent high-rise building, a reinforced concrete structure or a steel-frame concrete structure is used as a frame, and a hollow rectangular concrete body is arranged around a reinforcing bar or a steel frame corresponding to a pillar, and concrete is poured into the building. Is being built.

[0003] The above-mentioned concrete body is used as a form when casting concrete during construction, and is used as a surface material of a building after completion. For this reason, the hollow rectangular concrete body is generally formed by a centrifugal molding method having a beautiful surface.

[0004]

In the hollow rectangular concrete body as described above, since the distance from the center point to the corner of the formwork and the distance from the center point to the center of the surface are different, the concrete body is centrifugally formed. In this case, there is a problem that the concrete poured into the inside of the form is concentrated at the corners.

[0005] Therefore, when a hollow rectangular concrete body is centrifugally formed, it is essential to provide an inner mold for defining the dimensions of the corners. In the case of centrifugal molding with an outer mold and an inner mold, it is complicated and difficult to dispose the inner mold in advance in the operation of arranging the inner mold in the outer mold and after molding. There is a problem.

The applicant of the present application has developed an inner form device which has solved the above problems and has already applied for a patent (Japanese Patent Laid-Open No. 4-319406).
issue). ADVANTAGE OF THE INVENTION According to this invention, the operation | work arrange | positioned inside an outer formwork and a demolding operation can be implemented easily.

An object of the present invention is to provide an inner form device for forming a hollow rectangular concrete body which is an alternative to the above invention.

[0008]

According to the present invention, there is provided an inner mold device for forming a hollow rectangular concrete body according to the present invention, wherein the inner mold device is disposed inside an outer mold formed in a rectangular cylindrical shape. An inner formwork apparatus for casting concrete into a molding space formed between a frame and a hollow square concrete body to form a hollow square concrete body, wherein the hollow square concrete body is disposed to face a corner of an outer formwork. A plurality of formwork members having a corner piece corresponding to the inner angle and two pieces extending to near the center of each of the inner surfaces corresponding to the two inner surfaces and having an upright piece that stands inward at the end;
A separating / attaching member attached to each of the mold members to separate and separate the two pieces of the mold members from each other, and having a groove which is flexible and is formed over the entire length in the center of the inside and serves as a base point of bending; A connecting member connected to a standing piece of the adjacent form member, which is disposed to face substantially the center of the surface of the outer form member and is connected to the outer form form.

[0009]

According to the inner mold apparatus for molding a hollow rectangular concrete body (hereinafter referred to as "inner mold"), the work of disposing the inner mold inside the outer mold and the work of removing the mold can be easily performed. I can do it.

That is, a form member arranged opposite to a corner of an outer form is provided with a corner piece corresponding to an inner corner of a hollow rectangular concrete body (hereinafter referred to as a “concrete body”) and two inner surfaces. It is constituted by two pieces extending to the vicinity of the center of each inner surface, a separating member for separating and contacting the two pieces is provided on the form member, and further, adjacent to the form member arranged at each corner of the outer form. The inner mold is formed by connecting the pieces to be connected to each other by a connecting member arranged to face substantially the center of the surface of the outer mold, so that the two pieces of the mold member approach or move in accordance with the operation of the separating member. Separate. Further, since the connection member has flexibility, the connection member deforms following the deformation of the form member caused by the separation and contact of the two pieces.

Therefore, the inner mold is inserted into the outer mold while the two pieces of the mold are close to each other, and the separating member is actuated at a predetermined position to separate the two pieces. While being arranged inside the frame, a predetermined molding space can be formed between them.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the above inner mold will be described below with reference to the drawings. FIG. 1 is a side view of a molding form in which an inner form is disposed inside an outer form, FIG. 2 is a front view including a partial cross-sectional view of the molding form, FIG. 3 is a front view of the inner form, and FIG. FIG. 2 is an enlarged cross-sectional view of a main part of the inner mold.

First, the structure of a forming mold for centrifugally forming a hollow rectangular concrete body will be schematically described with reference to FIGS. In the figure, an inner mold A is inserted into an outer mold B, and is supported by end plates C fixed to both ends of the outer mold B, so that a predetermined gap is formed between the inner mold A and the outer mold B. Is formed. Any one surface (for example, surface B1) of the outer mold frame B is configured to be detachable from a main body B2 composed of the other three surfaces.

The surface B1 of the outer frame B is opened in advance, and end plates C are fixed to both ends of the main body B2.
After arranging a reinforcing cage (not shown) in the space formed by the end plate C and the end plate C, the inner form frame A is inserted into and supported by the holes formed in the end plate C. A molding space D is formed, concrete is uniformly poured from the surface B1 opened into the molding space D, and the surface B1 is fixed to the main body B2. Thereafter, the molding frame is rotated to perform centrifugal molding. By carrying out the curing of the above, it is possible to obtain a concrete body having a desired shape.

In this embodiment, a case in which a concrete body having a square cross section is formed will be described. For this reason, the inner mold A and the outer mold B each have a shape capable of forming a square. However, the square in the present invention is not limited to a square but means a so-called polygon.

Next, the structure of the inner mold A will be specifically described with reference to FIGS. In the figure, an inner formwork A connects a formwork member 1 and a connection member 2 having dimensions set in advance according to a target concrete body, and is connected to two pieces 1a of the formwork member 1. It is configured by attaching and detaching member 3.

The form member 1 has a corner piece 1b for defining the inside angle of the concrete body and two pieces 1a extending to the center of the inner surface of the concrete body. The form member 1 is formed by bending a thin steel plate by press working, and has sufficient flexibility in the bending direction.

The corner piece 1b of the form member 1 is formed so that the interior angle of the concrete body can be formed to 45 degrees. Inside the corner piece 1b, a triangular rib 4 composed of two flat bars is formed over the entire length, and the rib 4 causes the corner piece 1b to exert appropriate rigidity.

The two pieces 1a of the form member 1 are
From the center to the center of the inner surface of the concrete body with a predetermined length, and an inequilateral angle 5 is fixed to the end portion over the entire length.

A plurality of stiffeners 6 are fixed to each of the pieces 1a at predetermined intervals in the longitudinal direction. The stiffener 6 has a substantially triangular shape, and its tip reaches the vicinity of the connecting line 1c between the piece 1a and the corner piece 1b.

Therefore, the two pieces 1a are unequal side angles 5
The stiffener 6 and the stiffener 6 provide an appropriate rigidity to prevent deformation due to the action of centrifugal force generated at the time of centrifugal molding.
It is possible to transmit substantially uniformly over the entire length of a.

Incidentally, the end side of the piece 1a of the mold frame member 1 is bent toward the inside at a predetermined angle.

Since the two pieces 1a and the corner pieces 1b each have appropriate rigidity, the form member 1 configured as described above bends near the connection line 1c between the piece 1a and the corner piece 1b. Structure. That is, the mold member 1 is configured as a member having flexibility.

The connection member 2 is connected to a plurality of form members 1 arranged opposite to the corners of the outer form B, and
Together with the inner frame A, and is formed by molding a flexible material into a U-shaped cross section. In this embodiment, the connection member 2 is formed by extruding rubber.

The connecting member 2 has two connecting pieces 2a having substantially the same size as the flange 5a of the unequal angle 5 provided on the form member 1, and has a predetermined size and faces the inner surface of the concrete body. And the defining piece 2b defining the surface. A groove 7 is formed on the inside and at the center of the defining piece 2b over the entire length.

Therefore, the connecting member 2 can be bent with the groove 7 as a base point in response to an external force applied.

The connecting member 2 is connected to the form member 1 by bolts, nuts and the like (not shown). That is, the flange 5 of the unequal angle 5 fixed to the piece 1a of the form member 1
A plate 8 to which bolts are fixed at a predetermined pitch is attached to a, and a hole through which the bolt is inserted at the same pitch as the bolt fixing pitch is formed in the coupling piece 2a of the connecting member 2.

Therefore, the inner mold A is formed by inserting the bolts of the plate 8 into the holes of the connecting pieces 2a and fastening them with nuts, so that the adjacent mold members 1 are sequentially connected by the connecting members 2. Is possible.

The separating members 3 are attached to both ends of the form member 1 in the longitudinal direction.
Is provided. The separating member 3 is provided by connecting the two pieces 1a of the form member 1, and when inserting the inner form A into the outer form B, the pieces 1a are brought close to each other in advance, When they reach a predetermined position, they have a function of separating the pieces 1a from each other to form a molding space D between the pieces 1a and the outer mold B, and having the pieces 1a approach each other when the inner mold A is removed from the mold. It is.

As described above, the separating / contacting member 3 may be any mechanism capable of pushing and pulling the piece 1a. For example, a manual screw jack of a turnbuckle type, an electric screw jack driven by a motor, a hydraulic ram or a hydraulic cylinder It is possible to selectively use a device such as a hydraulic jack using the above. In this embodiment, a screw jack is used as the separating member 3.

Pins 9 are fixed to the respective stiffeners 6 fixed to both ends in the longitudinal direction of the two pieces 1a of the form member 1 by means of welding or the like. A ring 11 attached to the ends of the screw rods 10a and 10b is fitted. The threaded rods 10a and 10b are formed with a right-hand thread and a left-hand thread, respectively. When the main body 12 is rotated in either direction, the rings 11 are separated or approach each other according to the rotation. .

Therefore, when the main body 12 of the separating member 3 is rotated, the force associated with the separation and connection of the ring 11 acts on the form member 1 via the pin 9, and the piece 1a of the member 1 is connected to the connecting line 1c. Bend in the vicinity of. Further, the connection member 2 is bent with the groove 7 as a base point in accordance with the deformation of the mold frame member 1. At this time, since the connecting member 2 has flexibility as a whole, the inner mold A is deformed without difficulty. For this reason, it is possible to easily dispose the inner mold A inside the outer mold B and remove the mold after molding the concrete body.

When the specifications (for example, surface width, thickness, etc.) of the concrete body to be molded are set, the dimensions of the outer mold B are set according to the specifications, and at the same time, the dimensions of the inner mold A are also set. Is set.

For example, when the width of the surface of the concrete body is the same and the thickness is different, or when the width of the surface of the concrete body is changed, the size of the inner surface of the concrete body is changed. It is necessary to change the distance L between the adjacent pieces 1a of the mold member 1 in the inner mold A.
Therefore, it is necessary to prepare a plurality of types of inner molds A having different distances L.

For this reason, when molding a concrete body based on a specific specification, it is necessary to select an inner mold A corresponding to the specification of the concrete body from many inner molds. May be hindered. Therefore, it is preferable that the inner mold A is configured to be applicable to a plurality of types of outer molds B.

In this embodiment, as shown in FIG. 4, the adjusting block 13 is interposed between the flange 5a of the unequal angle 5 fixed to the form member 1 and the connecting piece 2a of the connecting member 2. It is configured so that the distance between adjacent form members 1 can be adjusted.

The adjusting block 13 has a length equal to the entire length of the inner mold A, and the thickness of the piece 1 of the mold member 1 to be adjusted.
A plurality of types are set corresponding to the distance L of a.
The adjustment block 13 is formed with holes for inserting the bolts corresponding to the positions of the bolts provided on the plate 8.

Therefore, the plate 8 is attached to the unequal side angle 5 of the form member 1, the adjusting block 13 is attached by inserting the bolts of the plate 8, and the connecting piece 2a of the connecting member 2 is attached to attach the nut. By concluding,
The distance L between the pieces 1a in the inner mold A can be set to a desired value.

In the inner mold A constructed as described above, the outer mold B
The range applicable to the concrete is increased, and it is possible to cope with a subtle change in the thickness of the concrete body.

[0040]

As described in detail above, the inner formwork apparatus for molding a hollow rectangular concrete body according to the present invention improves the workability when disposing inside the outer formwork and the workability when removing the mold. I can do it.

When an adjusting block is interposed between the form member and the connecting member, the range of application to the outer form can be increased, and the thickness of the hollow rectangular concrete body to be formed is changed. In such a case, it is possible to easily cope with this change.

[Brief description of the drawings]

FIG. 1 is a side view of a molding form in which an inner form is arranged inside an outer form.

FIG. 2 is a front view including a partial cross-sectional view of a molding die.

FIG. 3 is a front view of the inner mold.

FIG. 4 is an enlarged sectional view of a main part of the inner mold.

[Explanation of symbols]

 Reference Signs List A inner mold B outer mold C end plate D molding space 1 mold member 1a piece 1b corner piece 1c connecting line 2 connecting member 2a connecting piece 2b defining piece 3 separating member 4 rib 5 unequal side angle 5a flange 6 stiffener 7 Groove 8 Plate 9 Pin 10a, 10b Screw rod 11 Ring 12 Body 13 Adjustment block

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiromichi Kato 1-22-2 Nishishinjuku, Shinjuku-ku, Tokyo Inside Haneda Hume Kanko Co., Ltd. (56) References JP-A-60-56508 (JP, A) Kaihei 1-1171614 (JP, U) JP-A 4-9708 (JP, U) JP-A 64-7509 (JP, U) JP-A 2-68107 (JP, U) (58) Fields surveyed ( Int.Cl. ⁷ , DB name) B28B 21/88 B28B 7/30

Claims (2)

(57) [Claims] An inner mold for forming a hollow rectangular concrete body by placing concrete in a molding space which is disposed inside an outer mold formed in a rectangular cylindrical shape and formed between the outer mold and the outer mold. A frame device, comprising a corner piece corresponding to an inner angle of a hollow rectangular concrete body disposed opposite to a corner of an outer formwork and two central surfaces corresponding to two inner surfaces, extending to near the center of each inner surface and an end portion. A plurality of formwork members having two pieces provided with upright pieces standing upright on the inside, and two of the formwork members attached to the respective formwork members.
A separating member for separating and separating the pieces from each other, a flexible member having a groove formed over the entire length in the center of the inner side and serving as a base point of bending, and disposed opposite to substantially the center of the surface of the outer mold frame; An inner frame device for forming a hollow rectangular concrete body, comprising: a connecting member connected to a standing piece of the adjacent frame member. 2. The inner frame device for molding a hollow rectangular concrete body according to claim 1, wherein an adjusting block is interposed between the piece of the frame member and the connecting member.