JP4465557B2 - Formwork structure for producing concrete fences - Google Patents

Description

  The present invention relates to a formwork structure that can be manufactured without giving a draft to the inner wall of a bottomed concrete fence.

  Conventionally, the inner wall of a concrete fence that is generally manufactured usually has a draft angle. As a special example, a structure in which the punching die is drawn in order as a nested structure that can be disassembled into a plurality of grades so that the slope is zero. However, it is difficult to implement with a bottomed structure, and it requires a separate technique shown in Japanese Patent Application No. 2006-89342 to form the bottom, and it takes time for demolding and reassembly.

  The object of the present invention is to provide a formwork structure in which the inner peripheral formwork can be removed by a relatively simple operation without making a draft on the inner wall when manufacturing a bottomed concrete fence at a factory. This is a technical problem to be solved.

  The technical means for solving the above-mentioned problem is that the opening surface of the concrete fence should be on the bottom, and this surface should be placed on the work surface plate. Each side has an outer form frame piece that is opened and closed by a hinge, and an inner peripheral form frame having a draft angle is formed upright in the substantially central portion of the work surface plate. And a bag body made of a flexible material such as rubber having a draft (or a rectangular parallelepiped shape) having no draft angle, which is detachably covered on the inner periphery formwork.

  Further, a stepped portion is provided at the center of the bottom (top portion in FIG. 1) of the inner peripheral formwork, and a bag made of a flexible material such as rubber with the corresponding portion cut out is put on the inner peripheral formwork to be detachable. Is what you get and

  Further, a thick part is formed on the outer peripheral part of the bag made of a flexible material such as rubber, and the bag is covered with the inner peripheral formwork to be detachable.

  The outer peripheral mold piece is assembled in a molded state, concrete material is injected between the inner peripheral mold form and the upper surface constituting the bottom surface, the upper surface is troweled and cured, and the outer peripheral mold piece is released. When the concrete block is removed, the bag made of the flexible material such as rubber is left in the concrete block. Thereafter, since the bag body is a flexible body such as rubber, it can be easily removed, completes all operations, and is easy to return to the pre-operation state.

  The influence of the draft angle is great except that it varies considerably depending on the thickness difference between the top and bottom of the side wall, and if the draft angle is eliminated, the weight will be lighter and the demolding work that is a problem in manufacturing can be performed without difficulty. By cutting the bottom surface of the bag body, the rigidity is lowered to facilitate the demolding work, and the outer shape of the bag body is changed by forming a thick part at the outer periphery of the bag body. Without increasing the internal volume, reducing the wall thickness, and making it bottomed, troublesome bottom molding work at the construction site can be omitted, contributing to securing water-stopping performance. It is highly useful.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a mold surface plate with which the opening surface 12 of a concrete bowl 11 as a product abuts, 2 denotes a hinge for swinging the outer peripheral mold frame 3 in the direction of an arrow ab, and 4 denotes the surface plate 1. An inner peripheral mold having an outer peripheral draft 5 at a substantially central portion of the inner peripheral mold 6, a rubber 6 or the like that coincides with an inner circumference of the inner peripheral mold 4 with a draft (5) of the inner peripheral mold 4. A detachable bag made of a flexible material, 13 is a bottomed portion of the concrete basket 11, and 14 is a bottom surface. The finished product is inverted in this state. FIG. 2 shows the concrete cage 12 immediately after demolding. In this state, the bag body 6 is still left, and after that, it is removed and the operation is completed. Next, FIG. 3 and FIG. 4 show application examples, wherein 7 is an outer step provided on the bottom of the inner peripheral formwork 4 and 8 is a cut of the bag body 6 excluded by the step 7. A notch part, 9 is a thick part formed on the outer surface of the bag body 6, and 15 is a thin part of the concrete basket 11.

Front sectional drawing which shows the assembly state of the formwork which implemented this invention. The partial cross section perspective view of the concrete cage of this invention which removed the formwork from FIG. The front sectional view which shows the assembly state of the formwork in the example of application structure with respect to FIG. FIG. 4 is a front cross-sectional view showing an assembled state of a formwork in a structure of a further application example with respect to FIG. 3.

Explanation of symbols

1. Formwork surface plate 2, hinge 3, outer periphery formwork 4, inner periphery formwork 5, outer periphery draft 6. 6. Bag body Step part 8. Notch 9. Thick portion 11, concrete ridge 12, opening surface 13 of concrete ridge, bottomed portion 14 of concrete ridge, bottom surface 15. Thin part

Claims (3)

  The concrete surface should be placed on the work surface with the opening surface of the concrete wall facing down, and if it is a square-shaped surface, the work surface plate should be a square, and the outer periphery formwork piece opened and closed with hinges on each side The inner peripheral formwork having a draft at a substantially central portion of the work surface plate, and further, the outer circumference is matched with the draft of the inner mold and the outer circumference is a cube having no draft ( A formwork structure for producing a concrete cage characterized in that a bag made of a flexible material such as rubber or the like is covered with an inner circumference formwork so as to be detachable.   A stepped portion is provided in the center of the bottom portion (top portion in FIG. 1) of the inner peripheral formwork, and a bag made of a flexible material such as rubber with the corresponding portion cut out is put on the inner peripheral formwork so as to be removable. The formwork structure of Claim 1 which manufactures the concrete fence characterized by the above-mentioned.   2. A formwork structure according to claim 1, wherein a thick wall is formed on the outer periphery of a bag made of a flexible material such as rubber, and the bag is covered with an inner periphery formwork so as to be detachable. .

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