JPH06226724A - Inner mold for cylindrical concrete molded product - Google Patents

Abstract

PURPOSE:To avoid the touch of inner mold members to a molded product at the time of collapsing them by constituting an inner mold with a plurality of inner mold members, and enabling the shafts and bearings of hinges for securing respective inner mold members to be relatively shifted in the direction normal to the shafts. CONSTITUTION:An inner mold 1 for manufacturing a rectangular water collection measure is divided into a plurality of inner mold members 3, 4, 5, 6, and the inner mold member 6 is secured on a basement, and the circular members 4, 5 are fixed by hinge parts 8, 9. On the inner mold member 4, the inner mold member 3 is fastened by a hinge part 7, and the tip ends of the inner mold members 3, 4 are faced to each other, and tightly connected by an arm 11 and fastening clamp 10. The shaft piece 12 of the inner mold member 3 and the bearing piece 13 of the member 4 are superimposed one to another in order to be pierced by a shaft 14, and further the shaft 14 is inserted into a slotted hole 14, thus the shaft piece 12 and bearing piece 13 are permitted to be relatively shifted in the direction normal to the shaft 14. The hinged part 8 is also permitted to be done in the same manner. Consequently, at the time of collapsing the inner mold 1, the corners of the inner mold 1 can be collapsed without being not in contact with the concrete molded product, resulting in easy mold release of a molded product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a box culvert,
The present invention relates to an inner mold of a formwork for manufacturing a tubular concrete product such as a rainwater basin.

[0002]

2. Description of the Related Art Generally, a forming mold for a tubular concrete product such as a box culvert and a rainwater stub comprises a tubular outer die and a tubular inner die disposed inside thereof. Concrete is filled between the inner mold and the inner mold, and after solidifying, the outer mold and the inner mold are removed to take out concrete products. There are several methods for removing the inner mold, such as breaking the inner mold into several pieces, and reducing the diameter to a small number. However, in recent years, the most excellent method is to provide a hinged part on the inner mold, fold the inner mold with this hinged part, and then remove the mold, which provides excellent operability and dimensional accuracy. , Cost performance, etc. can be obtained.

[0003]

Conventionally, when the inner mold is folded by a hinged portion and released from the mold, there is no problem if the inner mold has a cylindrical shape, but the corner angle is 90 as in the case of the rectangular tube shape. It was said that it was not applicable in the case of degrees. FIG. 8 is an explanatory diagram thereof, but when the inner mold member 40 is to be folded by the hinged portion 41, the corner portion 42 of the inner mold member draws an arc locus, which is a hardened concrete product. 43
It hits and cannot be folded after all. Therefore, the conventional rectangular tubular concrete product can be demolded by folding it only when the corner angle is chamfered and the corner angle is 135 degrees. According to the present invention, even if the corner is in the shape of a rectangular tube having an angle of 90 degrees or an angle close to 90 degrees, the inner die can be folded and detached from the hinged portion.

[0004]

SUMMARY OF THE INVENTION The present invention is divided into a plurality of inner mold members along the length direction of a tubular body, and these inner mold members are connected by a hinged portion, and the inner member is hinged. In the inner mold of the tubular concrete product that is released from the mold by folding,
An inner mold of a tubular concrete product, characterized in that a shaft of the hinged portion and a bearing are relatively displaceable in a direction perpendicular to the shaft.

[0005]

When the corner of the folding inner mold member hits the hardened concrete product in the demolding of the inner mold, the shaft of the hinged part and the bearing move relatively in the direction perpendicular to the shaft. The corners of the member are displaced horizontally so as to escape from the concrete surface and do not intersect the concrete product,
The inner mold member can be folded.

[0006]

1 to 4 relate to an inner mold 1 which is an embodiment of the present invention. The inner mold 1 is for manufacturing a prismatic water collecting basin, has a rectangular cylindrical shape, and is arranged inside the outer mold 2 having a rectangular cylindrical shape. The space between the inner mold 1 and the outer mold 2 is filled with concrete,
The water collecting basin is manufactured by demolding after curing.

As shown in FIG. 1, the inner mold 1 includes an inner mold member 3,
It consists of 4, 5, and 6. The largest inner mold member 6 is fixed to a base (not shown), and the inner mold members 4 and 5 are hinged at hinged portions 8 and 9. Further, the inner mold member 3 is hinged to the inner mold member 4 by a hinged portion 7. The tips of the inner mold members 3 and 5 are associated with each other and tightly connected by the arm 11 and the tightening clamp 10.

In the hinged portions 7, 8 and 9, the shaft and the bearing are displaceable relative to each other in the direction perpendicular to the shaft, that is, in the horizontal direction. The hinged portion 7 shown in FIGS. 2 to 4 will be described in detail as an example.
The shaft piece 12 is from the inner mold member 3, and the bearing piece 1 is from the inner mold member 4.
3, the shaft piece 12 is mounted on the bearing piece 13. As shown in FIG. 4, the shaft 14 projects downward from the shaft piece 12, the bearing piece 13 is provided with an elongated hole 15, and the shaft 14 is inserted into the elongated hole 15. As shown in FIG. 2, since the shaft 14 can move within the slot 15 by t,
The shaft piece 12 and the bearing piece 13 are relatively displaceable by t in a direction perpendicular to the shaft, that is, in the horizontal direction. The hinged portions 8 and 9 have the same structure as the hinged portion 7.

To fold the inner mold, first the clamp 10 is removed and the inner mold member 3 is folded. In FIG. 2, when the inner mold member 3 is rotated in the direction of arrow A, at the same time, the shaft piece 12 is displaced with respect to the bearing piece 13, whereby the inner mold member 3 moves in the direction of arrow B, and as shown in FIG. The corner portions 16 can be smoothly folded without intersecting with the hardened concrete product and without giving excessive strain to the inner mold member. Furthermore, the inner mold members 4 and 5 are sequentially folded, but the corner portions of the inner mold members 4 and 5 can also be smoothly folded without intersecting the concrete product. The inner mold can be assembled smoothly by operating in the reverse direction of the demolding.

Of course, the structure of the hinged part is not limited to this embodiment. For example, as shown in FIG. 5, a shaft piece 12 provided with an upward shaft 14 from the inner mold member 4 and a bearing piece 13 provided with an elongated hole 15 from the inner mold member 3 may be projected. .

The number of inner mold members to be divided and the positions of the hinged portions are not limited to those in this embodiment. FIG. 6 is a schematic top view of the inner mold 20 of another embodiment. The inner mold 20 is divided into inner mold members 21, 22, 23 and 24. The inner mold member 21 is fixed to a base (not shown), and inner mold members 22 and 23 are hinged on both sides thereof by hinged portions 25 and 26. Although not shown in FIG. 6, the hinged portions 25 and 26 have a displaceable structure like the hinged portions 7 to 9 of the above-described embodiment. The inner mold member 24 is a so-called “shade”, and is fitted into the tips of the inner mold members 22 and 23. The demolding of the inner mold 20 is performed by a "marker", that is, the inner mold member 24.
The upper mold, and then the inner mold members 22 and 23 are shown in FIG.
Fold it as shown by the broken line. The present invention relates to the inner mold member 24.
As described above, a part including an inner mold member that is not hinged may be used.

FIG. 7 is a schematic top view of the inner mold 30 of still another embodiment. The inner mold 30 is the inner mold members 31, 3
It is divided into 2, 33, 34 and 35. Inner mold member 31
Is fixed to a base (not shown), and inner mold members 32 and 33 are hinged on both sides by hinged portions 36 and 37. Further, the inner mold member 34 is hinged to the inner mold member 32 at the hinged portion 38, and the inner mold member 35 is hinged to the inner mold member 33 at the hinged portion 39, and the tips of the inner mold members 34, 35 meet. is doing. The hinged portions 36 to 39 have a displaceable structure similar to the hinged portions. The inner mold 30 is folded as shown by the broken line in FIG. The inner die 30 has a lower rigidity in the fixed portion to the base and a larger number of divisions into the inner die members than the inner die 1 described above, and therefore is inferior in dimensional accuracy and workability.

[0013]

INDUSTRIAL APPLICABILITY The present invention makes it possible to adopt a folding type in the production of a tubular concrete product having a corner angle of 90 ° to 90 °, which has been considered difficult in the past, and it is possible to adopt a foldable type in the concrete product production process and the concrete product. It improves the dimensional accuracy of and contributes to the cost reduction of the mold. Also, even if it is used for a mild one having a conventional corner angle of about 135 degrees, the inner mold member is displaced during the demolding and the contact with the concrete is significantly reduced, so that the concrete product is not damaged. , The life of the formwork is also extended.

[Brief description of drawings]

FIG. 1 is a top view of a mold using an inner mold 1 of an example.

FIG. 2 is a top view of a hinged portion 7.

FIG. 3 is a top view of a hinged portion 7.

FIG. 4 is a cross-sectional view of a hinged portion 7.

FIG. 5 is a sectional view showing an example of the structure of another hinged portion.

FIG. 6 is a schematic top view of the inner mold 20 of the embodiment.

FIG. 7 is a schematic top view of the inner mold 30 of the embodiment.

FIG. 8 is an explanatory diagram that a foldable type is not used in the conventional rectangular tube shape.

[Explanation of symbols]

 1 Inner mold 2 Outer mold 3 Inner mold member 4 Inner mold member 5 Inner mold member 6 Inner mold member 7 Hinge part 8 Hinge part 9 Hinge part 10 Clamp 11 Arm 12 Shaft piece 13 Bearing piece 14 Shaft 15 Oval hole 16 Corner part 20 Inner mold 21 Inner mold member 22 Inner mold member 23 Inner mold member 24 Inner mold member 25 Hinge part 26 Hinge part 30 Inner mold 31 Inner mold member 32 Inner mold member 33 Inner mold member 34 Inner mold member 35 Inner mold member 36 Bing part 37 Bing part 38 Bing part 39 Bing part 40 Inner part 41 Bing part 42 Corner part 43 Concrete product

Claims (1)

[Claims] 1. A tubular body which is divided into a plurality of inner mold members along the length direction of a tubular body, which inner mold members are connected by a hinged portion, and which is released from the mold by folding at the hinged portion. In the inner mold of the concrete product, the shaft of the hinged portion and the bearing are displaceable relatively in the direction perpendicular to the shaft.