JP2007230197A - Manufacturing method of concrete pit, and concrete pit using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a concrete pit with an integral bottom in which a base structure size is larger than an opening size, with an outer peripheral form and an inner peripheral form by a relatively simple operation in a workshop. <P>SOLUTION: A lower form 1 forming a lid mounting recess portion 2 and an opening 3 is mounted on a platen for operation 9, on which the cylindrical outer peripheral form 4 and the inner peripheral form with a bottom, which has a step forming portion, are erected in a concentric state. A concreting material is poured between the outer peripheral form 4 and the inner peripheral form, after curing only the inner peripheral form is first removed, and the step portion formed on the upper part is filled with a blocking plate 10 comprising a concrete flat plate of the same nature and previously formed separately. Further, the concreting material is poured thereon to form the bottom 11, and after curing, the outer peripheral form is removed, thus finishing all operations. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  According to the present invention, the lid that opens and closes should be placed on the upper part, the lower structural dimension is made larger than the opening dimension provided at the part where the lid is placed, and the bottom is integrally formed. Involved in concrete fences and their manufacturing methods.

  Conventionally, there are a configuration in which the opening size and the lower structure size are made the same and the bottom is made, and the lower structure size is made larger with respect to the opening size and the bottom is made, and a slab is laid on the site at the time of construction to make the bottom.

Problems to be solved by the invention

  The object of the present invention is that the outer peripheral formwork and the inner formwork are indispensable when manufacturing concrete fences at the factory, but the lower structural dimensions are made larger than the opening dimensions and integrated. If a concrete fence with a bottom is made, it is very difficult to remove the inner peripheral formwork. Focusing on this point, it is a technical problem to be solved to provide a configuration that can be implemented with relatively simple work.

Means for solving the problem

  The technical means for solving the above-mentioned problem is that a lower mold forming a lid mounting recess and an opening is placed on a work surface plate, and a cylindrical outer mold and a step are formed on the upper mold. The bottomed inner periphery formwork having the forming part is concentrically upright, and concrete material is injected between the outer periphery formwork and the inner periphery formwork, and after curing, only the inner periphery formwork is demolded. A closed plate made of a homogenous concrete plate prepared separately in advance is loaded into the step formed on the top, and concrete material is poured onto it to form the bottom, and after curing, the outer formwork and the lid are placed The recess is removed from the mold to complete the entire operation.

The invention's effect

  By increasing the size of the lower part (room) with respect to the opening size, the effective volume can be increased with respect to the outer dimensions of the bag, and the product weight can be reduced by configuring the side wall thickness relatively thin. It is finished and can be easily removed from the mold, which is a problem in manufacturing. In addition, by having a bottom, troublesome bottom molding work at the construction site can be omitted, ensuring water stoppage performance. At the same time, it is highly useful because it increases the rigidity of the entire bag.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a lower mold frame for forming a lid mounting recess 2 and an opening 3, 4 an outer peripheral mold frame having a cylindrical shape, and 5 a step forming portion 6 at the upper portion, and a bottom 7 An inner peripheral mold 8, 8 is a bottomless product formed by injecting concrete material between the outer peripheral mold 4 and the inner peripheral mold 5, and 9 is a work surface plate. The product that can be turned upside down in this state.
In FIG. 2, the process after removing the inner periphery formwork 5 from FIG. 1 is shown, and a closing plate 10 made of a concrete plate separately prepared in advance is placed on the step portion 6 formed at the top. Then, the bottom 11 is formed by pouring concrete material further onto this.
In FIG. 3, all molds are removed from the mold after curing from FIG. 2, and this is inverted (normal state), and a lid 12 that can be opened and closed is placed in the lid placing recess 2 on the upper surface. It will be.

Front sectional drawing which shows the assembly state of the formwork which implemented this invention. FIG. 2 is a front cross-sectional view explaining a next process by removing a part of the mold from FIG. 1. The partial cross section perspective view of the concrete fence of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, Lower mold frame 2, Cover body mounting recessed part 3, Opening part 4, Outer periphery mold frame 5, Inner periphery mold frame 6, Step formation part 7, Bottomed part 8, Bottomless product 9, Work surface plate 10, Blocking plate 11 Bottom 12, lid

Claims (2)

  A bottom mold that forms a lid mounting recess and an opening is placed on a work surface plate, a cylindrical outer mold on this, and a bottomed inner mold with a step forming part on the upper mold Concentric upright, injecting concrete material between the outer mold form and the inner mold form, and after curing, only the inner mold form is removed in advance, and the same quality concrete prepared separately beforehand A closed plate made of a flat plate is loaded into the step formed on the top, further concrete material is poured onto it to form the bottom, and after curing, the outer formwork is removed to complete all operations. A method for producing concrete fences.   2. The concrete casket according to claim 1, wherein the bottom structure dimension is larger than the opening dimension in a concrete casket having a box with an open bottomed top.

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