JPH0739928B2 - Jig for measuring length of city gas supply pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a main pipe (main pipe or branch pipe) of a city gas pipe.
In order to measure the length of the supply pipe connected to the pipe without digging and cutting the connection between the main pipe and the supply pipe, an electrode that contacts the supply pipe with a measuring tool sent into the metal gas supply pipe And a detection means for detecting whether or not the electrode is in contact with the supply pipe in an electric circuit composed of the supply pipe and the electrode. Regarding the ingredients.

[Conventional technology]

Conventionally, as shown in FIG. 4 (a), an object (22) is attached to the tip of a feeding wire (21) to form a length measuring tool,
The object (22) is provided with only one of the positive electrode and the negative electrode (A), and the other electrode (B) is formed so that it can be connected to the ground side end of the city gas supply pipe (2). ) Is placed in the supply pipe (2), the electrode (A) of the object (22) is formed so as to be constantly in contact with the supply pipe (2), and both electrodes (A),
When (B) is in contact with the supply pipe (2), a current flows through the electric circuit composed of the supply pipe (2) and the electrodes (A) and (B), as shown in FIG. In addition, the object (22) reaches the main pipe (16) having a diameter considerably larger than that of the supply pipe (2) by the pressure feeding in the supply pipe (2) by the pressurized gas supply device (23), and the electrode (A ) Is separated from the supply pipe (2) and the main pipe (16), the current stops flowing in the electric circuit, and the detection means (24) determines the timing at which the object (22) reaches the main pipe (16). The length of the supply pipe (2) can be measured by detecting and feeding the length of the feed wire (21) into the supply pipe (2) at that time.

[Problems to be solved by the invention]

However, since the city gas supply pipe (2) is often used with an insulating joint for preventing electric contact, it is equivalent to the ground side end of the supply pipe (2) and the object (22) feeding as in the prior art. In the method in which the electric current is passed over the entire length between the parts, when the object (22) passes through the insulation break, the electric current stops flowing and the detecting means (2)
It was mistaken that the 2) reached the main pipe (16), and there was a drawback that accurate length measurement of the supply pipe (2) could not be performed in a highly reliable state.

An object of the present invention is to ensure that the length of the supply pipe can be accurately measured even if the city gas supply pipe has an insulating joint.

[Means for solving problems]

The characteristic configuration of the present invention is that the feed wire of the length-measuring tool that is fed into the city gas supply pipe is made of a conductor, and one electrode of the pair of electrodes is formed, and the other electrode is formed to have a larger diameter than the feed wire. And is provided at the tip of the length measuring tool in an insulated state with respect to the feeding wire, and the function and effect are as follows.

[Action]

That is, the feed wire of the length measuring tool is made of a conductor, and this is used as one electrode, and the other electrode formed with a diameter larger than this feed wire is insulated from this feed wire, and the tip of the length measuring tool is By being provided in the section, the supply pipe between the contact point between the feed wire and the supply pipe and the contact point between the electrode and the supply pipe provided at the tip of the length-measuring tool is used as a part of the electric circuit, and the detection means is provided. Since both electrodes are electrically connected via a power source to form a power circuit, and the electrode provided at the tip of the length measuring tool is formed with a diameter larger than the feeding wire, it bends in the pipe. Even if there is a part, it is hard to get caught and can be almost always brought into contact with the inner wall of the supply pipe while guiding, and the sending wire is flexible and pushes the electrode at the tip to send it into the supply pipe, so the sending wire is where Will be in contact with the feed tube inner surface, if the contact with the electrode supply tube surface of the distal end portion, except where the insulating joint between the electrodes is interposed, the electric circuit is closed. Therefore, when the detection means detects that no current flows for a predetermined period of time, the time when the current stops flowing is determined to be the time when the tip of the length measuring tool reaches the main pipe. The length of the supply pipe can be measured from the feeding length.

Therefore, even if there is an insulating joint in the supply pipe, the insulating joint is insulated for a very short time, for example, about 1 to 2 seconds after one of the electrodes passes and the other electrode passes. Since the current stop only occurs due to the joint, for example, if the current stop for 3 seconds or more is considered, the tip of the measuring tool is considered to have reached the main pipe The length of the supply pipe can be measured reliably.

〔The invention's effect〕

As a result, for example, when the inner surface of the supply pipe is lined by applying the liquid lining material by the lining object that is pulled back from the main pipe side, the length of the supply pipe is accurately measured in advance by the length measuring jig to supply the lining material. It has become possible to provide a good jig for measuring the length of a city gas supply pipe, which makes it possible to accurately determine the start position and the start position of the lining process at the end of the supply pipe on the main pipe side.

〔Example〕

 Next, examples will be shown.

As shown in Fig. 1, a coil spring wire (3) made of a conductive material, which is made of a conductive material, is used as a feeding wire, and a spherical guide (1) made of a conductive material, and the diameter of the guide is larger than that of the guide (1). Lining finishing object (5),
The two lining objects (6) are attached in that order from the tip toward the base side, and the tube (7) for injecting the liquid lining material is passed through the coil spring wire (3) to form a coil. Spring wire (3)
The tube and the tube (7) are rotated and wound around a storage drum (4) which can be freely drawn and taken up, the lining material injection device (11) is connected to the tube (7), and the coil spring wire (3) is rotated. In the state, the lining material is fed into and withdrawn from the city gas supply pipe (2), and the lining material injected into the supply pipe (2) by the tube (7) is supplied with the withdrawal of the lining object (6). A tube inner surface lining tool for applying to the inner surface of the tube.

The spherical guide (1) is a coil spring wire (3)
The outer diameter of the coil is larger than the outer diameter of the coil, and the two bent metal wires (8) project toward the tip end side of the spherical guide (1), and both ends of each of the spherical guides (1). ), And the spherical guide (1) passes smoothly through the curved portion of the supply pipe (2) so that the spherical guide (1) passes through the curved portion of the supply pipe (2). is there.

As shown in FIG. 1 and FIG. 3, two lining objects (6) are fixed to the coil spring wire (3), and the coil spring wire (3) is fixed at a fixed position in the longitudinal direction. A lining finishing object (5) is slidably fitted onto a coil spring wire (3) across the attached spherical guide (1) and lining object (6).

That is, when the coil spring wire (3) is fed into the supply pipe (2), the lining finishing object (5) approaches the lining object (6) as shown in FIG. Due to the bending of the coil spring wire (3) between the finishing object (5) and the spherical guide (1), the spherical guide (1) is configured to easily pass through the bent portion of the supply pipe (2). . When the coil spring wire (3) is pulled out of the supply pipe (2), the lining finishing object (5) approaches the spherical guide (1) as shown in FIG. The contact of (1) with the lining material applied to the supply pipe (2) can be suppressed by the position regulation of the spherical guide (1) by the lining finishing object (5), and a good lining treatment can be performed. I am doing it.

As shown in FIG. 2, a contraction tube (14) made of an electrically insulating material is fitted over the tip of a coil spring wire (3) made of an electrically conductive material, and a spherical guide (1) made of an electrically conductive material such as brass is attached. , An electric wire (10) electrically insulated by a shrinkable tube (14) and connected to a coil spring wire (3) by a screw (9) and covered with an electrically insulating cover (10a)
Through the tube (7) and connected to the spherical guide (1) by the screw (9), and the coil spring wire (3) and the electric wire (1) are connected to the DC power source (12) external to the detection means (15).
0) to connect the coil spring wire (3) and the spherical guide (1) to the positive electrode (A) for contacting the city gas supply pipe (2) and the other to the negative electrode (B). Has been formed.

A magnet (13) is attached to the spherical guide (1) so that the spherical guide (1) can be surely brought into contact with the supply pipe (2) even in the standing pipe portion of the supply pipe (2). .

In short, when feeding the city gas into the metal supply pipe (2), the coil spring wire (3) and the spherical guide (1) are brought into contact with the supply pipe (2) as electrodes (A) and (B), An electric circuit composed of the supply pipe (2) and the electrodes (A) and (B) can be constructed.

Further, both electrodes (A) and (B) are electrically connected to the current power supply (12) to form a power supply circuit, and whether or not the spherical guide (1) as the electrode (B) is in contact with the supply pipe (2). A detection means (15) for detecting whether or not is provided in this power supply circuit. When the coil spring wire (3) is fed into the supply pipe (2) in a rotating state, the spherical guide (1) provided at the tip of the wire is in contact with the inner wall of the supply pipe (2) and the supply pipe (2).
At the same time, the coil spring wire (3) is always in contact with the inner wall of the supply pipe (2) at any part thereof, so that the contact point between the spherical guide (1) and the supply pipe (2) is As long as an insulating joint is not provided between the coil spring wire (3) and the contact point of the supply pipe (2), the electric state of the electric circuit is substantially maintained.

Therefore, the detecting means (15) is configured to notify that the spherical guide (1) has reached the main pipe (16) by a buzzer or a lamp when the energization is stopped for a set time of about 3 seconds.
The pipe inner surface lining tool is provided with the length measuring function of the supply pipe (2).

That is, as shown in FIG. 3C, the spherical guide (1)
When it reaches the large-diameter main pipe (16) from the small-diameter supply pipe (2), it is separated from the large-diameter main pipe (16), and that state is detected by the detection means (15) to form a coil spring shape. The feeding of the wire (3) into the pipe is stopped, and the length of the supply pipe (2) is measured from the feeding length of the coil spring wire (3) up to that point. Since the coil spring-shaped wire (3) is fed even after the energization is stopped, if necessary, the coil spring-shaped wire (3) is pulled out by a predetermined length, and then the lining material injection by the tube (7) is started, The supply of the lining material into the main pipe (16) is eliminated, and the lining process over the entire length of the supply pipe (2) can be surely executed.

[Another embodiment]

 Next, another embodiment will be described.

It may be configured as a jig for length measurement of the city gas supply pipe (2) instead of being configured as a pipe inner surface lining tool as in the above-mentioned embodiment. In that case, one of the length measurement jigs may be used. The electrode (A) or (B) is formed to have a diameter larger than that of the feed wire and is provided at the tip of the length measuring tool, and the other electrode (B) or (A) is composed of the feed wire and the positive electrode (A). ) And the negative electrode (B) are provided so as to be electrically insulated from each other, and the specific structure thereof can be variously changed and various kinds can be used.

The specific configuration of the detection means (15) and the detection method can be appropriately changed, and for example, a general ammeter, an electric resistance measuring instrument, etc. may be used.

The type of city gas may be natural gas, propane gas, butane air gas, coal-based gas, or any other type.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention, FIG. 1 is a conceptual view of the entire jig, FIG. 2 is an explanatory view of essential parts, and FIG.
7A to 7C are explanatory views of the usage state. Figure 4 (a),
(B) is an explanatory view of a conventional example. (2) …… Supply pipe, (15) …… Detecting means, (A),
(B) ... electrode.

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Fumio Tsukimoto 5-1, Hirano-cho, Higashi-ku, Osaka City, Osaka Prefecture Osaka Osaka Gas Co., Ltd. Inside the rubber factory (72) Inventor Tetsuo Rokuhara, 4-5 Minamihorie, Nishi-ku, Osaka-shi, Osaka Prefecture Tokawa Rubber Co., Ltd. (72) Toshiaki Shinzo 1-6-19, Morinomiya-chuo, Higashi-ku, Osaka-shi, Osaka No. 10 Togawa Giken Co., Ltd. (56) Bibliography Sho 54-3168 (JP, U) Sho 60-114907 (JP, U)

Claims (1)

[Claims] 1. A pair of electrodes (A) to be brought into contact with a supply pipe (2) of a length measuring tool provided with a bendable feed wire (3) for feeding into a metal supply pipe (2) of city gas. ), (B) are provided, an electric circuit is constituted by the supply pipe (2) and the electrodes (A), (B), and the electrodes (A), (B) are connected to the supply pipe (2). A jig for measuring the length of a city gas supply pipe provided with a detection means (15) having a power supply (12) for detecting whether or not it is in contact with
The feed wire (3) is made of a conductor to be one electrode (A) of the pair of electrodes (A) and (B), and the other electrode (B) is the feed wire (3). A jig for measuring a city gas supply pipe, which is formed to have a diameter larger than that of the feeding wire (3) and is electrically insulated from the wire (3) and is provided at the tip of the length measuring tool.