JPH0748927B2 - Tube pillow for scrap pipe and method of making the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe pillow for use in a broken pipe of an underground power transmission line and a method for making the pillow.

[0002]

2. Description of the Related Art In the case of constructing an underground power transmission line, the pipes constituting the pipe are generally arranged in a plurality of rows and a plurality of stages in parallel with each other with a required interval in the vertical and horizontal directions. In this case, if there is another buried obstacle near the planned installation site of the pipeline, in order to avoid the obstacle, the pipes may be arranged in the middle of the pipeline, for example, from 2 rows 3 stages to 3 rows 2 stages. It may be necessary to change such as.

It should be noted that changing the arrangement of the pipes constituting the pipe line as described above during the process is generally called a broken pipe.

[0004]

When constructing a pipeline,
Tube pillows have traditionally been used to support the weight of the tubes themselves, to position the tubes, and to maintain the spacing between adjacent tubes. Since this pipe pillow has a constant outer diameter of pipes that make up the pipeline, the positions of the pipes, and the intervals between the pipes, etc., it is made in advance with a plastic product having a predetermined size and shape, and the piping work is performed. Intervene one by one in the case of.

On the other hand, when the break pipe is used, the positions of the pipes forming the pipe line and the intervals between the pipes are not constant, so that the form of the break pipe is patterned to some extent, and the plastic pipe pillow is appropriately segmented. It was dealt with by using a combination of wood and timber.

[0006]

However, since the form of the scrap pipe depends on the situation of the site, the construction range that can be dealt with by the conventional method is limited to some extent.

Therefore, it is an object of the present invention to provide a pipe pillow and a method for producing the pipe pillow that can cope with any form of the scrap pipe.

[0008]

In order to solve the above-mentioned problems, a pipe pillow according to the present invention has a bag filled with a foam material mixed with a reinforcing piece, and the foam material and a bag adhered thereto. It has a structure in which a groove-shaped recess that matches the outer diameter of the pipe is formed.

Further, the method for producing the tube pillow according to the present invention is as follows.
This is a method in which a broken pipe is placed on a bag containing a reinforcing piece, and then a foaming agent is injected into the bag to foam inside the bag.

[0010]

The above-mentioned pipe pillow is foamed and formed into a predetermined shape in accordance with the piping form at the site. The reinforcing piece in the bag supports the weight of the tube before foaming and forms a groove-like recess along the outer diameter of the tube. When the foaming agent is injected into the bag, the foaming agent fills the bag while including the reinforcing piece in the foam, and adheres to the bag to be solidified while maintaining the shape of the groove-like recess.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows two rows of three through the wall of a manhole 1.
When the pipes 2 constituting the pipeline for underground power transmission line arranged in stages are arranged in two rows and three stages in a broken pipe, the pipe pillows 3 are arranged in the broken pipe so that the arrangement is changed to three rows and two stages. The installed state is shown. Reference numeral 10 denotes a sewer pipe as a buried obstacle. As shown in FIG. 2, the tube pillow 3 is obtained by filling a bag 4 with a foam 6 having a reinforcing piece 5 mixed therein.
Further, the bag 4 that is in close contact with this is provided with the groove-shaped recess 7 that matches the outer diameter of the tube 2.

The bag 4 is a plastic sheet provided with ventilation holes 8 so that the air inside can be discharged to the outside at the time of foaming. If the bag 4 is formed of a breathable non-woven fabric, the vent hole 8 is not necessary. Also,
A foaming agent injection port 9 is provided at a corner portion of the bag 4.

The vent hole 8 and the injection port 9 are closed after the foaming is completed.

As the reinforcing piece 5, in addition to the plastic short pipe as shown, plastic beads,
Use plastic chops. The plastic short pipe has an advantage that the foaming agent can easily spread quickly inside the bag because the foaming agent can pass through the inside of the bag during foaming.

The foam 6 is a rigid urethane foam,
As the foaming agent, there is, for example, a product name "Sunfoam" (main agent: polyol, curing agent: isocyanate) manufactured by Sanyo Chemical Industries, Ltd.

In the method of producing the above-mentioned pipe pillow 3, a bag 4 in which the reinforcing pieces 5 are stored in advance at an appropriate density is prepared (see FIG. 3), and this is shown in FIG. To install. At this time, the reinforcing piece 5 escapes to both sides of the tube 2 due to the weight of the tube 2, and forms the groove-shaped recess 7 along the bag 4 along the outer diameter of the tube 2. After the arrangement of the pipes 2 of the combing pipe is determined, the foaming agent is injected from the injection port 9 of the bag 4 (FIG. 5). As the foaming progresses, the air inside the bag 4 escapes from the vent holes 8 and the foam 6 gradually fills the entire interior of the bag 4 while including the reinforcing piece 5 therein and solidifies. As a result, a groove-shaped recess 7 that is in close contact with the outer diameter surface of the tube 2 is formed in the bag 4 and the foam 6 that is in close contact with the bag 4, and the tube 2 is positioned and supported by the groove-shaped recess 7. Further, the ventilation hole 8 and the injection port 9 are closed to complete the production of the tube pillow (see FIG. 2).

When the installation work of the scrap pipe and the pipe pillow is completed as described above, the excavated ground is backfilled and the pipe 2 and the pipe pillow 3 are buried.

[0018]

As described above, according to the pipe pillow for waste pipe and the method for producing the same of the present invention, since the reinforcing piece is housed in the bag, the arrangement state of the pipes before the injection of the foaming agent is different. Even with such a form, the bag is deformed according to the form and forms a groove-like recess along the lower outer diameter surface of the tube.
Moreover, the above-mentioned form is held by the foam, and the tube is positioned. Further, since the foam is reinforced by the reinforcing piece, it is possible to give strength to the tube pillow and prevent its deformation even when earth pressure or the like acts.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional perspective view showing a usage state of a tube pillow according to an embodiment.

FIG. 2 is a partially enlarged sectional view of the above.

[Fig. 3] Cross-sectional plan view of a tube pillow in the process of being created.

[Fig. 4] Partial cross-sectional view of a tube pillow in the process of being created.

[Fig. 5] Partial cross-sectional view of a tube pillow in the process of being created.

[Explanation of symbols]

 1 Manhole 2 Pipe 3 Pipe pillow 4 Bag 5 Reinforcing piece 6 Foam 7 Groove-shaped recess 8 Vent hole 9 Injection port 10 Sewer pipe

Front page continuation (72) Inventor Shuji Tsugami 3-3-22 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Kansai Electric Power Co., Inc. (72) Inventor Mamoru Higaki 3--22, Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Issue Kansai Electric Power Co., Inc. (72) Inventor Tadayuki Tokuda 3-22 Nakanoshima, Kita-ku, Osaka, Osaka Prefecture Kansai Electric Power Co., Inc. (72) Inventor Fukuya Riho 1-12 Kitahorie, Nishi-ku, Osaka-shi, Osaka No. 19 Kurimoto Iron Works Co., Ltd. (72) Inventor Koichiro Katayose 1-12-12 Kitahori, Nishi-ku, Osaka City Osaka Prefecture No. 19 No. 19 Kurimoto Iron Works Co., Ltd. (72) Teruhiro Mihara Kitahorie, Nishi-ku, Osaka City Osaka Prefecture 12th-19th Kurimoto Iron Works Co., Ltd.

Claims (2)

[Claims] 1. A pipe pillow for scrap pipe, wherein a bag is filled with a foam material mixed with a reinforcing piece, and a groove-shaped recess matching the outer diameter of the tube is formed in the foam body and the bag in close contact therewith. 2. A bag accommodating a reinforcing piece is installed in a broken and piped portion, a groove-like recess is formed along the outer diameter of the pipe in the bag, and then a foaming agent is injected into the bag, How to make a pipe pillow for scrap pipe that foams inside the bag.