JPH0714944Y2 - Marking body for detecting valve bulb of underground pipe - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is mounted on a valve chi of an underground buried pipe such as a gas pipe, and notifies the buried point of the valve chi in response to a detection signal sent from the ground. The present invention relates to a marker for detecting a valve Qi of a buried underground pipe.

(Prior art) A sign body having a response part composed of an LC resonance circuit is embedded in the vicinity of an underground pipe such as a gas pipe, a water pipe, or an electric power pipe, and the above-mentioned LC is grounded at a later date. The detection signal having the resonance frequency component of the resonance circuit is sent to respond to this LC resonance circuit (absorption of the detection signal or emission of the resonance signal, etc.).
There is a known system for detecting the burial point and detecting the burial point of the underground burial pipe.

As a marker used in such a system, one that is installed in the ground by simply burying it above the underground buried pipe, or one that is attached to the underground buried pipe by a belt or the like is known. .

By the way, various gas shutoff devices are attached to the gas pipe in order to adjust the supply amount of gas and shut off the supply. One of the gas shutoff devices is called a valve chi. This valve Qi is used for the initial flow rate adjustment of gas and the maintenance after that, and it is mainly installed in the location of the low pressure branch, and has a normal valve pit (a solid pit with a valve for installing the valve in the ground). It is buried in the ground together with the gas pipe without the need for the one that is provided. For this reason, the position of this valve Qi is unknown from the ground after it is buried like the gas pipe, but when excavating near the gas pipe, operate the valve Qi to prevent gas leakage accidents. It is necessary to find the burial site of this valve Qi before the construction work so that the gas can be shut off.

Therefore, even in such a case, naturally, by using the system described above, it is possible to extremely easily detect the buried point of the valve chi.

(Problems to be solved by the invention) However, since the valve chi is provided at the branch point of the pipe as described above, there are joints and multiple pipes around the valve chi. The tube becomes an obstacle, and it is difficult to attach the marker body of the type that is mounted by the belt or the like as described above. Therefore, the marker which is simply buried in the ground as described above is used for the valve tea.

However, since this type of sign is merely buried in the ground, it may be displaced from a predetermined position due to changes in the ground or the like, and there is a problem that the detection accuracy is reduced or difficult.

(Means for Solving the Problems) The valve-chi detection marker of the underground buried pipe according to the present invention is
It is a sign that is attached to the valve Qi and responds to the detection signal sent from the ground to inform the buried point of the valve Qi, and the responding part that responds to the detection signal is stored in the upper part of a tall synthetic resin case In addition, a fitting portion that fits with the head portion of the handle of the valve che is provided at the lower end of the case.

(Function) Mounting on the valve chee is performed by fitting the fitting part provided on the lower end of the case to the handle head of the valve chee, and after mounting, the position may be displaced due to the fluctuation of the ground. There is no. In addition, the case is made of synthetic resin, which is a non-magnetic material, and the response part is housed in the upper part of the case and a constant distance is always maintained between the valve che and the pipe connected to the valve che Even if the tube is made of a magnetic material, there is no interference from these.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing a mounted state of a valve-chi detecting marker of an underground buried pipe according to the present invention, and FIG. 2 is an exploded perspective view of the marker.

The marker 1 has a response portion 2 that responds to a detection signal accommodated in an upper portion of a tall synthetic resin case 3, and a fitting portion that fits with a handle head H of the valve chee B at a lower end portion of the case 3. The joint 35 is provided.

The responding part 2 is generally composed of an LC resonance circuit, but in the embodiment of the present invention, it is composed of an antenna coil 21 and a resonator 22 including a piezoelectric vibrating body (for example, a crystal resonator). There is. In this way, when a piezoelectric vibrating body is used as the resonator, a large amount of energy is accumulated in the vibrating body, so that the response signal corresponding to the detection signal sent from the ground can be large and the number of turns of the antenna coil 21 can be at most. Can be times. The responding portion 2 thus configured is supported and fixed to the outer peripheral surface of the support ring 4.

The case 3 is composed of a tall case body 31 and a lid 32 which is attached to the upper end of the case body 31. The case main body 31 is a container having a shallow bottom with an upper end of a cylindrical body having a large diameter, and the upper end having the large diameter accommodates the responding unit 2 to accommodate the responding unit storage unit 33.
In addition, the collar portion 34 is formed on the outer peripheral edge of the upper end. In addition, the inner wall surface of the lower end of the case body 31 has the same shape as the outer shape of the handle head H of the valve chee B, and the fitting portion 35 that can be detachably fitted to the handle head H. Has been made. The lid 32 is the case body 31.
The sealing portion of the response portion storage portion 33 of the above, the locking projection that engages with the flange portion 34 of the case body 31 at the lower edge of the inner wall side of the peripheral wall 36.
37 is formed all around. Then, the response portion 2 supported and fixed to the support ring 4 is accommodated in the response portion storage portion 33 of the case body 31 as described above, and the lid body 32 is pressed so as to be covered from above the case body 31. By doing so, the locking projection 37 of the lid 32 and the flange 34 of the case body 31 are engaged with each other, the lid 32 is capped on the case body 31, and the response portion 2
Is sealed and protected in the response portion storage portion 33 of the case body 31.

The shape of the marker 1 of the present invention is not limited to that shown in the drawings.

The mounting of the marker 1 of the present invention on the valve chee B as described above is completed only by fitting the fitting portion 35 of the case 3 on the handle head H of the valve chee B. With this, the marker body 1 is firmly attached to the valve Qi B, and does not deviate from the predetermined attachment position even if an external force such as a change in the ground is received, and the loop surface of the antenna coil 21 of the response unit 2 in the case 3 is Always in a horizontal position, that is, parallel to the ground surface,
In addition, the distance between the valve Q B and the joint J and the pipe (not shown) around the valve Q is kept constant. As a result, even if the valve Qi B, the joint J, and the pipe are magnetic materials, they are not interfered with from each other, and the locator (of the detection device that transmits the detection signal on the ground and receives the resonance signal from the marker 1 ( Since it is parallel to (not shown), high detection accuracy can be obtained.

In FIG. 1, reference numeral S is a stopper for opening and closing the flow passage in the valve chee B, and T is a stopper operation jig insertion hole formed in the handle head H.

(Effect of the device) Since the sign body of the present invention can be mounted on the valve Qi that could not be conventionally mounted, it does not leave the valve Qi even if the ground changes, etc. Can be accurately detected. In addition, since it only needs to fit the fitting part at the lower end of the case with the handle head of the valve Qi, it can be attached to the valve Qi.
The installation work is very easy.

Furthermore, the case is made of synthetic resin, which is a non-magnetic material,
Moreover, since the reaction part is housed in the upper part of the case and a constant distance is constantly maintained between the valve Qi and the joints and pipes connected to it, the valve Qi and the joints and pipes are made of magnetic material. Also does not receive interference from these, and high detection accuracy can be obtained.

[Brief description of drawings]

FIG. 1 shows an embodiment of a marker for detecting a valve Qi of an underground buried pipe according to the present invention. FIG. 1 is a sectional view showing a mounted state of the marker, and FIG. 2 is an exploded perspective view of the marker. 1 ... Marker, 2 ... Response part 3 ... Case, 35 ... Fitting part B ... Valve Qi, H ... Handle head

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Yonezu Yamada, 3316, Ishii, Sakado, Saitama Prefecture (72) Inventor, Hisaichi Ooi, 2-5-7 Koishikawa, Bunkyo-ku, Tokyo Meisei Electric Co., Ltd. (72 ) Inventor Atsutoshi Miyazaki 2-5-7 Koishikawa, Bunkyo-ku, Tokyo Within Meisei Electric Co., Ltd. (56) References Open 63-72579 (JP, U) Open 59-100275 (JP, U) Actual Open 59-98380 (JP, U) Actual 55-36372 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A marker attached to a valve chi of an underground buried pipe and adapted to inform a buried point of the valve chi in response to a detection signal sent from the ground, wherein a responding part responding to the detection signal is a back. A valve chi for detecting an underground buried pipe, which is housed in an upper part of a high synthetic resin case and provided with a fitting part at the lower end of the case for fitting with the handle head of the valve che Labeled body.