JP2001030217A - Manufacture of perforated molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a perforated molding capable of easily and rapidly manufacturing the molding. SOLUTION: The method for manufacturing a perforated molding comprising the steps of disposing a hole forming member 5 for forming an inlet/outlet hole 2a between an outer form 3 and an inner form 4, constituting the member 5 of a position fixable material by an attraction force of a magnet 6, fixing the member 5 by the force of the magnet 6 disposed on one outer surface of the forms 3 and 4, filling a ready mixed concrete, a molten resin or the like between the forms 3 and 4, and removing the forms 3, 4 and the member 5 in the fixed state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a perforated molded product for producing a perforated molded product such as a handhole, a manhole or an information box.

[0002]

2. Description of the Related Art Many of the above-mentioned perforated moldings are made of concrete, and an outflow / inflow hole is formed in a side wall of the formed body by a rock drill or the like.

[0003] According to the above method, not only two steps of a forming step for forming a formed body and a hole forming step for forming an inflow / outflow hole in the formed formed body are required, but also a predetermined step is required. The work of making holes is a troublesome and troublesome work, and requires a long working time. In addition, the position of the hole must be changed depending not only on the difference in the size of the molded body but also on the portion to be buried in the ground. And there was room for improvement.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has as its object to provide a method of manufacturing a perforated molded body capable of easily and quickly producing a perforated molded body. is there.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an outer mold frame located on the outside and an inner mold located on the inner side to form a side wall of a molded body such as a handhole or manhole. A frame is arranged, a hole forming member for forming an inflow / outflow hole between the outer mold frame and the inner mold frame is arranged, and the hole forming member is made of a material that can be fixed in position by the attraction force of a magnet. After fixing, the hole forming member is fixed by the attractive force of a magnet disposed on the outer surface of at least one of the outer mold frame and the inner mold frame. The outer mold, the inner mold, and the hole forming member are removed in a state of being filled and solidified with the frame, and a perforated molded body is manufactured. Before filling the ready-mixed concrete or the molten resin between the outer mold and the inner mold as described above, the hole forming member between the outer mold and the inner mold at a desired position between the outer mold and the outer mold and By fixing by the attraction force of the magnet arranged on at least one of the outer surfaces of the inner mold and manufacturing the molded body, it is possible to form a hole at a desired position during molding.

[0006] A cylindrical body is externally fitted to the hole forming member and disposed between the outer mold frame and the inner mold frame, and only the hole forming member is removed. By forming the holes, not only the hole forming member can be easily removed, but also a pipe or the like can be immediately connected to the tubular body after removal, without passing through a joint or the like.

The outer surface of the hole forming member or the inner surface or both surfaces of the cylindrical body is subjected to a process for facilitating relative movement between the hole forming member and the cylindrical body, thereby forming the hole forming member. The member can be easily and quickly detached from the tubular body.

The molded body is made of concrete, and a water-swellable sealing material is provided on the outer surface of the cylindrical body, so that the solidified concrete and the cylindrical body have a relation of expansion coefficient of the filled fresh concrete. Can be prevented by the water-swellable sealing material.

[0009] By attaching a sheet or a film having a large number of dimension lines in the vertical and horizontal directions to the outer surface of the outer mold frame, the inner mold frame, or both of the mold frames, the position of the hole is measured and determined. And can be performed easily and quickly.
Further, if the sheet or the film is constituted by a replaceable one, it can be advantageous in terms of cost.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a plurality of pipes 1 to be buried underground for connecting, branching, and passing optical fibers at predetermined locations, and for performing maintenance and inspection after burying. The handhole 2 is shown. Instead of the handhole 2, a molded product such as a manhole or another box may be used. As shown in FIG. 2, the hand hole 2 has a substantially rectangular bottom wall 2F constituting a bottom portion, and four side walls 2A, 2 which are integrally erected upward from the outer peripheral edge of the bottom wall 2F.
B, 2C, and 2D (only three sheets are shown in the figure), and a ceiling wall 2E that closes upper openings of the side walls 2A, 2B, 2C, and 2D.

The handhole 2 may not be able to be arranged at a fixed position from the ground due to land subsidence or the presence of hard rock or existing pipes. It is desired to change the position of the inflow / outflow holes formed in the side walls 2A, 2B of the first tube, that is, the through holes 2a, 2b (see FIG. 2) for connecting the pipe 1. The position of the through holes 2a and 2b is changed at the time of forming the handhole 2, and a method of forming the handhole 2 will be described below. Although the number of the through holes 2a and 2b is two, the number of the through holes 2a and 2b may be one or three or more.

First, FIGS. 2, 3 and 4 (a),
As shown in (b) and (c), four side walls 2A, 2B,
Located outside and 4 to form 2C, 2D
An outer mold frame 3 composed of four vertical plates and an inner mold frame 4 located inside the outer mold frame 3 at a set interval and composed of four vertical plates are arranged. A metal hole forming member 5 for forming the through holes 2a and 2b is disposed between the inner mold frame 3 and the inner mold frame 4 (see FIG. 4A). FIG. 3 shows three vertical plates 3A, 3B, and 3C constituting the outer mold frame 3, and three vertical plates 4A and 4 constituting the inner mold frame 4.
B and 4C are shown. Then, a magnet 6 for applying a suction force to the hole forming member 5 is attached to the outer mold frame 3.
The magnet 6 and the hole forming member 5 are fixed at that position in a state where the outer mold frame 3 is sandwiched between the magnet 6 and the hole forming member 5 using the attraction force by arranging the magnet 6 and the hole forming member 5 at the position. To be able to. As shown in FIG. 3, a film 7 having a large number of dimension lines 7 </ b> A is attached to the outer surface of the outer mold frame 3 (the sheet 7 may be a thick sheet). Through hole 2a,
The position of the magnet 2b can be immediately grasped, and the desired position X of the magnet 6 can be easily and quickly determined. Next, as shown in FIG. 4 (b), the ready-mixed concrete is filled between the outer form 3 and the inner form 4, and the ready-mixed concrete is in a solidified state. The handhole 2 is manufactured by removing the inner frame 4 and the hole forming member 5 (see FIG. 4C). Positioning a magnet 6 on the outer surface of a vertical plate 3A constituting the outer formwork 3,
In this state, by positioning the hole forming member 5 at a position substantially corresponding to the inner surface of the vertical plate 3A, the two are fixed by the attractive force of the magnet, and then the other vertical frames 3B, 3C, 4A, 4B, 4C.
May be formed. If the film 7 is configured so that it can be repeatedly attached to the surface of the outer mold frame 3, it can be used repeatedly. The outer surface of the outer mold frame 3 can easily arrange the magnets 6 on the outer surface, but may be arranged on the outer surface of the inner mold frame 4 or
Further, it is also possible to arrange the magnets 6 on the outer surfaces of both the molds 3 and 4, respectively.

As the magnet 6, an electromagnet or the like can be used in addition to a permanent magnet. When an electromagnet is used, there is an advantage that an attractive force can be applied only when necessary. When the outer mold frame 3 and the inner mold frame 4 are made of wood or plastic material, the magnet 6 can be moved from the desired position X.
Is slightly shifted, the magnet 6 can be easily slid along the surface of the film 7 to move the magnet 6 and the hole forming member 5 to a desired position. When at least the outer frame 3 is made of metal (the inner frame 4 may be made of metal), the magnet 6 can be firmly fixed to the outer surface of the outer frame 3. There is an advantage that it is possible to reliably prevent the 6 from slipping under its own weight.

As shown in FIG. 5, a cylindrical body 9 made of plastic, metal, ceramic or the like is externally fitted to the hole forming member 5, and the hole in which the cylindrical body 9 is externally fitted is formed. The forming member 5 is disposed between the outer mold frame 3 and the inner mold frame 4 as described above, and as shown in FIG. 4B, fresh concrete is poured and the tubular body 9 is adhered to the concrete to be solidified. As shown in FIG. 4C, only the hole forming member 5 is detached using a hammer or the like so that the cylindrical body 9 forms the through hole 2a (the inner surface of the cylindrical body 9). Is also good.
Although the above-mentioned tubular body 9 may be omitted and implemented, the tubular body 9 may be made of something other than concrete,
As shown in FIG. 2, the base end 8A of the cylindrical rubber body 8 can be internally fitted and fixed to the cylindrical body 9 with an adhesive or the like. The tube 1 is attached to the tip of the rubber body 8 fixed to the cylindrical body 9.

As shown in FIG. 6, if a water-swellable sealing material 10 is attached to the outer surface 9A of the cylindrical body 9 with an adhesive or the like, the cylindrical body 9 and the concrete (side wall 2A) can be bonded to each other. It is possible to reliably prevent the occurrence of a gap between them and the occurrence of water leakage or the like.

Although the case where the handhole 2 is made of concrete has been shown, for example, plastic or the like which is solidified by pouring a molten resin may be used, and may be made of any material that can be molded.

[0017]

According to the first aspect, before filling the ready-mix concrete or the molten resin between the outer mold and the inner mold,
Fixing the hole forming member at a desired position between the outer mold frame and the inner mold frame by a magnet attracting force arranged on at least one outer surface of the outer mold frame and the inner mold frame to manufacture a molded body; Thus, a hole can be formed at a desired position during molding, and a perforated molded body having a different hole position can be easily and quickly manufactured without the need for a conventional perforating step.

According to the second aspect, the cylindrical member is externally fitted to the hole forming member, and is disposed between the outer mold frame and the inner mold frame, and only the hole forming member is removed. By forming the outflow / inflow holes, there is an advantage that not only the hole forming member can be easily removed but also a pipe or the like can be immediately connected to the tubular body after removal, without passing through a joint or the like.

According to the third aspect, a process for facilitating relative movement between the hole forming member and the cylindrical body is performed on the outer surface of the hole forming member or the inner surface or both surfaces of the cylindrical body. , The hole forming member is smooth with respect to the cylindrical body, and
The detachment can be easily and quickly performed, and the working time can be reduced.

According to the fourth aspect, the molded body is made of concrete, and by providing a water-swellable sealing material on the outer surface of the cylindrical body, the concrete and the cylinder hardened due to the expansion coefficient of the filled ready-mixed concrete. The generation of a gap between the sheet and the body can be prevented by the water-swellable sealing material, and the reliability of the product can be improved.

According to the fifth aspect, the position of the hole is measured by attaching a sheet or a film having a large number of dimension lines in the vertical and horizontal directions to the outer surface of the outer mold frame, the inner mold frame, or both mold frames. This can be performed easily and quickly as compared with the determination, and the working time can be reduced.
Further, if the sheet or the film is made of a replaceable material, it can be advantageous in terms of cost and economically.

[Brief description of the drawings]

FIG. 1 is a side view showing a handhole buried underground.

FIG. 2 is a longitudinal side view of a handhole.

FIG. 3 is a perspective view showing a relationship between a mold, a film, and a magnet.

4A and 4B show a procedure for forming a handhole, wherein FIG. 4A shows a state immediately before pouring ready-mixed concrete, and FIG.
(C) shows a state in which ready-mixed concrete is poured and solidified.
Shows a state in which the handhole is formed.

FIG. 5 is an exploded perspective view showing a hole forming member and a tubular body.

FIG. 6 is a cross-sectional view showing a state in which a cylindrical body having a sealing material attached to an outer surface is provided on a side wall;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe 2 Handhole 2A, 2B, 3C, 2D Side wall 2E Top wall 2F Bottom wall 2a, 2b Through hole (inner surface) 3 Outer formwork 3A, 3B, 3C Vertical plate 4 Inner formwork 4A, 4B, 4C Vertical plate 5 Hole forming member 6 Magnet 7 Film 7A Dimension line 8 Rubber body 9 Cylindrical body 9A Outer surface 10 Sealing material X Desired position

Claims (5)

[Claims] 1. An outer mold located outside and an inner mold located inside to form a side wall of a molded body such as a handhole or a manhole, and an inner mold located inside is disposed between the outer mold and the inner mold. A hole forming member for forming an inflow / outflow hole is disposed in the hole, and the hole forming member is made of a material that can be fixed in position by an attractive force of a magnet. After being fixed by the attraction force of a magnet arranged on at least one outer surface of the frame, ready-mixed concrete or molten resin is filled between the outer mold and the inner mold, and the outer mold is solidified. , An inner mold, and a method for manufacturing a perforated molded body, wherein the perforated member is removed to produce a perforated molded body. 2. A method in which a cylindrical body is fitted over the hole forming member is disposed between the outer mold frame and the inner mold frame, and only the hole forming member is removed. The method for producing a perforated molded product according to claim 1, wherein the outflow / inflow holes are formed. 3. A process for facilitating relative movement between the hole forming member and the cylindrical body on an outer surface of the hole forming member or an inner surface or both surfaces of the cylindrical body. 3. The method for producing a perforated molded article according to 2. 4. The method according to claim 1, wherein the molded body is made of concrete, and a water-swellable sealing material is provided on an outer surface of the cylindrical body. 5. The production of a perforated molded product according to claim 1, wherein a sheet or a film having a plurality of dimension lines attached vertically and horizontally is attached to an outer surface of the outer mold frame, the inner mold frame, or both mold frames. Method.