JPH0535344Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a branch stopper with a saddle band for underground metal pipes such as water pipes and gas pipes.

[Conventional technology and its problems]

When branching a branch pipe from a buried pipe such as a water main or gas main, a method is generally adopted in which a branch stopper with a saddle band is attached to the main pipe and the branch pipe is connected to the branch stopper.

Retrieval work for underground pipes such as water mains and gas mains is often carried out at branch taps.
In this type of construction, it is necessary to quickly detect the location of underground main branch plugs from above ground. Hitherto, buried pipe probes that use the so-called guided exploration method have been known as a means of detecting underground metal pipes from above ground, but although these probes can detect the metal pipes themselves, they cannot reach the location of branch plugs. There is a problem that accurate detection is not possible, and the current situation is that we basically have no choice but to search based on the materials used when the pipes were buried.

[Means and actions to solve the problem]

In view of these conventional difficulties, the present invention attempts to provide a branch stopper with a saddle band that makes it easy to detect the buried position.The main feature of this invention is that it generates an induced magnetic field by passing a current during detection. This is for underground metal piping, and a permanent magnet is attached and fixed to the branch plug body or saddle band.

If a branch plug with a saddle band of this kind of structure is used in underground piping, when detecting underground pipes with a normal underground pipe detector, the magnetic field at the branch plug position will change due to the action of the permanent magnet, This allows the branch position to be easily detected.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows an embodiment of the present invention, in which 1 is an underground main pipe for water, gas, etc., 2 is a branch plug according to the present invention for taking out a branch pipe from the main pipe, and 3 is a branch pipe. The branch plug 2 has a saddle band 4 that is tightened and fixed to the main pipe 1 with bolts and nuts, and the inside of the saddle band 4 is connected to an extraction hole (not shown) formed in the main pipe.

In this embodiment, a permanent magnet 5 is attached to the head of the main body of the branch plug 2. The installation and fixing of this magnet is
This can be done by any means such as bolting or gluing.

FIG. 2 shows another embodiment, in which the tubular body of the branch plug 2' rises up from the saddle band 4 in an inverted L shape, and a ring-shaped body is attached to the horizontal end of the tubular branch plug body. A permanent magnet 5' is inserted and fixed.

Note that the permanent magnets 5, 5' may be attached to the saddle band side instead of the branch plug body. Alternatively, a method may be adopted in which a permanent magnet is attached in advance to a case made of vinyl chloride or the like, and this is attached to the branch plugs 2, 2'. Note that a copper member may be attached instead of the above-mentioned permanent magnet.

By using such branch plugs with saddle bands as branch plugs for underground piping,
The location of the branch plug can be easily detected using a general buried metal detector. Figure 3 schematically shows the principle of such a detection method, in which electromagnetic waves with directional characteristics sent from the transmitter 6 cause a secondary current to flow through the buried metal pipe P, generating an induced magnetic field m. The position of the buried metal pipe P is detected by measuring the center point of this magnetic field using the search coil 7 and the receiver 8. In such a detection method, the magnetic field at the branch tap position changes due to the action of the permanent magnets 5, 5', and the magnetic field is detected in a manner different from that at other positions. can be properly known.

[Effect of idea]

As described above, according to the present invention, the location of branch plugs of underground metal pipes such as water mains and gas mains can be easily detected using a general buried pipe detection method. Therefore, there is an advantage that this type of buried pipe extraction work can be made more efficient and rational. In addition, since this invention is a branch plug member with a magnet, there is no need to position or install magnets etc. on site, and it can be easily installed. The magnet does not sometimes shift from the branch stopper position, and even if digging is repeated, its function will not be impaired in any way.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the present invention. FIG. 2 is a side view showing another embodiment of the present invention. FIG. 3 is an explanatory diagram showing an example of the principle of detecting a buried metal pipe. In the figure, 1 is the main pipe, 2 and 2' are branch plugs, and 4
denotes a saddle band, and 5 and 5' denote permanent magnets.

Claims (1)

[Scope of utility model registration request] A branch with a saddle band for underground metal piping that generates an induced magnetic field by passing a current during detection, and has a permanent magnet attached and fixed to the branch plug body or saddle band. plug.