JP2000240883A - Polyethylene pipe coupling structure of steel pipe line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the polyethylene pipe coupling structure of a steel pipe line to be simply laid, without being affect by a rainy weather and superior in earthquake resistance. SOLUTION: This polyethylene pipe coupling structure comprises a polyethylene pipe coupling 11a, a steel pipe 14a having an end part fitted in the polyethylene pipe coupling 11a and the end part 12a provided with a cut-through part 13a through which the inner peripheral surface of the polyethylene pipe coupling 11a is cut, a steel pipe 14b in which an end part 12b is fitted in and provided with a cut-through part 13b through which the inner peripheral surface of the polyethylene pipe coupling 11a is cut through the end part 12, and fastening tools 15a and 15b mounted on the outside of the polyethylene pipe coupling 11a. This constitution simplifies all mechanical works to joint the steel pipes 14a and 14b and the polyethylene pipe coupling 11a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a polyethylene pipe joint structure using a polyethylene pipe joint in a steel pipe line.

[0002]

2. Description of the Related Art Steel pipes (general names including coated steel pipes, etc.) are used for piping such as gas pipes and water pipes, and buried pipes are generally used for pipes because of effective use of land.
However, the buried pipe may be deformed due to ground displacement caused by an earthquake or land subsidence.

As an example of this measure, Japanese Patent Laid-Open Publication No. Hei 10-61
No. 867 discloses a pipeline provided by using a polyethylene pipe for a steel pipe joint. FIG. 6 is a view for explaining the arrangement of the pipes, and FIG. 7 is an enlarged sectional view of a portion including a joint indicated by a symbol A in FIG. As shown in FIG. 6, a pipe 1 is configured such that an outer surface polyethylene-coated steel pipe 2 is arranged using a polyethylene pipe joint 3.

As shown in FIG. 7, a polyethylene pipe joint 3 has a steel pipe 4 entirely covered with a coating polyethylene 5, and the end faces of the polyethylene pipe joint 3 are heat-sealed to each other. . The outer polyethylene-coated steel pipes 2 provided with the polyethylene pipe joints 3 were installed adjacent to each other, and the end faces 7 of the polyethylene pipe joints 3 facing and contacting each other were heat-sealed to each other to join the outer polyethylene-coated steel pipes 2. Pipe line 1 is provided. Reference numeral 6 indicates an inner surface coating.

[0005] According to the above-mentioned polyethylene pipe joint 3, at the time of arranging the pipe line on site, welding at the joint portion of the outer polyethylene coated steel pipe 2, which is a constituent unit of the pipe line, and inner / outer surface coating can be omitted. It is possible to shorten the process and save the construction cost.

In the field, the joint of the outer surface polyethylene-coated steel pipe 2 is not welded to the joint.
The joint portion can secure water stoppage by heat fusion bonding of polyethylene.

[0007] Further, since the polyethylene pipe 3 is used for the joint, the polyethylene pipe 3 absorbs the seismic displacement, and the ground displacement is equal to or more than that of the case where the flexible tube is used. It is described that it has the ability to follow and earthquake resistance.

[0008]

However, the technique disclosed in Japanese Patent Application Laid-Open No. H10-61867 is as follows.
There are the following problems.

[0009] In the above-mentioned technique, in the case of an on-site construction, an external polyethylene clad pipe provided with a polyethylene pipe joint has to be heat-sealed and joined to end faces 7 of the polyethylene pipe joint 3 which come into contact with each other. Susceptible to
Further, when the end of the polyethylene pipe joint is heat-sealed to the end of the outer surface polyethylene clad tube, there is a problem of interface strength.

The present invention has been made to solve the above problems, and uses a polyethylene pipe joint excellent in earthquake resistance, which can be easily constructed without being affected by the influence of rain or the like. An object of the present invention is to provide a polyethylene pipe joint structure of a steel pipe line.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a polyethylene pipe joint structure using a polyethylene pipe joint in a steel pipe line, wherein the polyethylene pipe joint and the polyethylene pipe joint are fitted at one end with an end. A polyethylene pipe joint structure for a steel pipe conduit, comprising: a steel pipe provided with a biting portion into which an inner peripheral surface of the polyethylene pipe joint bites; and a fastener attached to the outside of the polyethylene pipe joint. It is.

[0012] A polyethylene pipe joint structure using a polyethylene pipe joint in a steel pipe line, wherein an end portion is fitted into the polyethylene pipe joint and the polyethylene pipe joint, and a plurality of biting portions are formed in a circumferential direction of the end portion. It is characterized by comprising a steel pipe provided and a fastener provided outside the polyethylene pipe joint.

According to the present invention, all of the polyethylene pipe joints can be mechanically connected to the steel pipe line, and the on-site construction is easy without being affected by rainy weather or the like. By using the polyethylene pipe joint for the steel pipe pipeline, even if the steel pipe pipeline undergoes ground displacement due to an earthquake or the like due to an earthquake or the like, the polyethylene pipe absorbs the ground displacement, so that the earthquake resistance of the steel pipe pipeline can be improved.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view showing an embodiment of the present invention, and FIG. 2 is a side sectional view of FIG.

[0015] The polyethylene pipe joint structure according to the present invention comprises:
Polyethylene pipe joint 11a and polyethylene pipe joint 11
a steel pipe 14 having an end portion 12a fitted into the end portion a and a biting portion 13a into which the inner peripheral surface of the polyethylene pipe fitting bites.
a steel pipe 1 having an end 12b fitted therein and a biting portion 13b into which the inner peripheral surface of the polyethylene pipe fitting bites into the end 12b.
4b and fasteners 15a and 15b attached to the outside of the polyethylene pipe joint 11a. Code 16
a and 16b are deposits.

In the present invention, when steel pipes 14a and 14b are piped as buried pipes using polyethylene pipe joints 11a for the steel pipe pipes, and when the pipes are formed, the steel pipes are displaced due to ground displacement due to earthquake or land subsidence. The deformation of the road is prevented by absorbing the ground displacement by the polyethylene pipe joint 11a.

The steel pipe to be used in the present invention is a generic name of steel pipes used for pipes such as gas pipes and water pipes, and includes coated steel pipes and the like.
mm.

It is generally known that a polyethylene pipe can follow a deformation of a steel pipe line due to a ground displacement caused by an earthquake or the like.

The polyethylene pipe joint 11a is fitted with steel pipes 14a, 14a so as to be able to sufficiently absorb ground displacement.
The distance (length), thickness, and the like between the biting portions 13a and 13b of b are appropriately determined.

The steel pipes 14a and 14b have an end 12a and an end 1
2b are provided with biting portions 13a and 13b into which the inner peripheral surface of the polyethylene pipe joint 11a bites.
Then, the ends 12a and 12b are fitted. As will be described later, the polyethylene pipe joint 11a is tightened by the fasteners 15a, 15b after the end portions 12a, 12b are fitted therein, and the inner peripheral surface of the polyethylene pipe joint 11a is fitted into the bite portion 13a,
13b is bitten. Polyethylene pipe joint 11 is steel pipe 1
4a, 14 are softer than the engaging portions 13a, 13b.
Easily bites into the inner peripheral surface of the polyethylene pipe joint 11a,
The joint between the polyethylene pipe joint 11a and the steel pipes 14a and 14b can be strengthened.

The shape of the biting portions 13a and 13b is not particularly limited, but the existing pipe line is cut to form the polyethylene pipe joint 11a.
In order to simplify the biting portions 13a and 13b on site, a plurality of grooves may be provided in the V-shape in the circumferential direction or spirally to form the biting portions.

The polyethylene pipe joint 11a is a steel pipe 14
After the end portions 12a and 12b of the a and 14b are fitted, the polyethylene pipe joint 11a is tightened from the outside with the fasteners 15a and 15b, and the biting portions 13a and 13b are engaged with the inner peripheral surface of the polyethylene pipe joint 11a. Let it go.

The ratio of biting into the inner peripheral surface of the polyethylene pipe joint 11 is set to about 20% or less of the thickness of the polyethylene pipe constituting the polyethylene pipe joint 11a. If it exceeds 20%, on the contrary, the strength of the polyethylene pipe joint 11a is reduced, and the function as the joint is reduced.

The fasteners 15a and 15b may be simple ones using a steel strip as a band, and both ends of the steel strip may be bent and appropriately fastened using clasps (bolts and nuts) 16a and 16b. I can do it.

The fasteners 15a and 15b are not limited to those described above, and may be any as long as the engagement portions 13a and 13b can be appropriately engaged with the inner peripheral surface of the polyethylene pipe of the polyethylene pipe joint 11a. . A fastening ring or the like can also be used.

[0026] Cut the existing pipeline to make polyethylene pipe joint 1
1a is connected, the polyethylene pipe joint 11a is moved to cut the steel pipe 14a (or the steel pipe 1).
4b) end 12a (or end 12b) is fitted into the polyethylene pipe joint 11a, then the steel pipe 14a and the steel pipe 14
b, the part of the polyethylene pipe joint 11a is returned to the end 12b (or end 12a) side of the other steel pipe 14b (or steel pipe 14a), and the polyethylene pipe joint 11a is aligned. And, as mentioned above,
The biting portions 13a and 13b are bitten into the inner peripheral surface of the polyethylene pipe joint 11a, and the polyethylene pipe joint 11a and the steel pipe 1
4a and 14b are joined.

Further, a polyethylene pipe joint 11 is added to the new pipe.
When connecting a, the engaging portion 1 having an appropriate shape at a factory or the like is used.
3a and 13b are provided, and the steel pipe 14a (or the steel pipe 1) is previously provided.
The end 12a (or end 12b) of 4b) is relatively fitted, and the polyethylene pipe joint 11a and the steel pipes 14a and 14b are joined on site.

Although the embodiment of FIG. 1 has been described with reference to a steel pipe, the same effect can be obtained by using a steel pipe whose surfaces are covered with anticorrosion measures on the surfaces of the biting portions 13a and 13b. As described above, in the present invention, all the joining of the steel pipes 14a and 14b and the polyethylene pipe joint 11a can be mechanically and simply performed on site without being affected by the influence of rain or the like.

FIG. 3 is a half sectional view showing another embodiment of the present invention. 1 and 2 are denoted by the same reference numerals, and a part of the description is omitted.

The polyethylene pipe joint structure according to the present invention comprises:
Polyethylene pipe joint 11b and polyethylene pipe joint 11
b, a steel pipe 14a provided with a biting portion 13a into which the inner peripheral surface of the polyethylene pipe fitting 11a bites, and a steel pipe 14a fitted with the end 12b, and the polyethylene pipe fitting 11a into the end 12b. Is constituted by a steel pipe 14b provided with a biting portion 13b into which the inner peripheral surface of the steel pipe 14 bites, and a fastener 17 attached to the outside of the polyethylene pipe joint 11b. Fastener 1
Reference numeral 7 indicates that a wide steel strip is used as a band, and both ends of the wide steel strip are bent so that fasteners (bolts, nuts or the like) 18 can be used for proper tightening.

As shown in FIG. 3, the fastener 17 has a function of a sleeve, and is provided with the polyethylene pipe joint 11.
In addition to appropriately performing the tightening of b, the polyethylene pipe joint 11 is protected from earth pressure or the like when the pipe is buried, or pressure resistance is given to the case where the pipe working pressure is high.

When the polyethylene pipe joint 11b is protected from the above-mentioned earth pressure or the like, or when the pipe working pressure is high, the outside of the polyethylene pipe joint 11b including the fastener 17 of the polyethylene pipe joint 11b is further increased. It may be covered with a new sleeve. FIG. 4 is a side view showing another embodiment of the present invention, and FIG. 5 is a side sectional view of a main part indicated by reference numeral B in FIG.

Parts common to those in FIG. 1 are denoted by the same reference numerals, and a part of the description is omitted. The polyethylene pipe joint structure according to the present invention uses the split type polyethylene pipe joint 11c. The split-type polyethylene pipe joint 11c includes a split pipe joint main body 19a and a split pipe joint main body 19b, and is provided with flanges 20a and 20b, and is mechanically flange-joined to be integrated with a fixture 21. Reference numeral 21a is a bolt, and reference numeral 21b is a nut.

The polyethylene pipe joint 11c has a steel pipe 14a having an end portion 12a fitted into a split pipe joint body 19a and a bite portion 13a into which the inner peripheral surface of the split pipe joint body 19a is fitted. A steel pipe 14b in which a portion 12b is fitted, and a biting portion 13b into which the inner peripheral surface of the split pipe fitting body 19b bites into an end 12b, and fastening tools 15c and 15d attached outside the polyethylene pipe fitting 11c. It is configured.

According to the split type polyethylene pipe joint 11c, the polyethylene pipe joint 11c can be mechanically and simply joined when the polyethylene pipe joint 11c is connected to the buried existing pipe.

[0036]

According to the present invention, all of the polyethylene pipe joints can be mechanically constructed on the steel pipe line on site, so that the present invention is simple and unaffected by the influence of rain or the like. , Welding can be omitted, and the process can be shortened and the work cost can be saved.

Further, since a polyethylene pipe is used for the joint, the polyethylene pipe joint absorbs the seismic displacement, so that the followability to the ground displacement and the earthquake resistance can be improved.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is a half-side sectional view showing another embodiment of the present invention.

FIG. 4 is a side view showing another embodiment of the present invention.

FIG. 5 is a sectional side view of a main part indicated by reference numeral B in FIG. 4;

FIG. 6 is a diagram for explaining a conventional pipe arrangement.

7 is an enlarged sectional view of a portion including a joint indicated by a symbol A in FIG.

[Explanation of symbols]

 11a, 11b polyethylene pipe joint 11c split-type polyethylene pipe joint 12a, 12b end 13a, 13b biting portion 14a, 14b steel pipe 15a, 15b, 15c, 15d, 17 19a, 19b split pipe joint body fastener 16a, 16b, 18 clasp 20a, 20b flange 21 fixture 21a bolt 21b nut

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Eiji Matsuyama Inventor 1-2-1 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 3H019 FA01 FA16

Claims (1)

[Claims] 1. A polyethylene pipe joint structure using a polyethylene pipe joint in a steel pipe line, wherein an end of the polyethylene pipe joint is inserted into the polyethylene pipe joint, and an inner periphery of the polyethylene pipe joint is inserted into the end. A steel pipe joint structure for a steel pipe line, comprising: a steel pipe having a biting portion into which a surface bites; and a fastener attached to the outside of the polyethylene pipe joint.