JPH08200546A - Buried position identification device - Google Patents

Abstract

PURPOSE: To enable stable detecting accuracy to be obtained regardless of aged deterioration and fluctuations in ground, etc. CONSTITUTION: A nonvolatile liquid 7 is injected into a sealed container 6, a float 9 whose center of gravity is located in its lower part is floated on the nonvolatile liquid 7, and a radio response tag 11 is provided inside the float 9; the radio response tag 11 has a data carrier element 12 storing information about a buried pipe 14 and an antenna 13 by which signals are transmitted and received.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buried position identifying device for underground buried pipes buried underground, and particularly to water and sewer pipes, industrial water pipes, agricultural water pipes, gas pipes and electric / communication line pipes. The present invention relates to a technique effectively applied to a buried position identification device using a wireless response tag for detecting the buried position of a mobile phone.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a wireless tag has a data carrier element 2 in which an individual number of underground buried pipe and management information are stored in a glass tube 1 and an antenna 3 for transmitting and receiving signals. The glass tube 1 is sealed, and the glass tube 1 is sealed by a resin case 4 to be reinforced and protected.

The wireless response tag is mounted on an underground buried pipe and is searched from the ground by a detector (not shown). When the detector approaches the wireless response tag, the antenna 3
The carrier signal is output to. Then, the information stored in the data carrier element 2 is read out and input to the detector via the antenna 3. As a result, information such as the position of the underground buried pipe is detected. Such a technique is disclosed in, for example, Japanese Patent Laid-Open No. 4-39483.

[0004]

However, the present inventor has found that the above-described wireless response tag has the following problems. That is, since the burying posture of the wireless responsive tag changes due to the secular change of the underground burying pipe and the fluctuation of the ground after the wireless responsive tag is buried underground together with the pipe, the detection accuracy of the burying position of the underground burying pipe decreases. .

The object of the present invention is to solve the above problems.
An object of the present invention is to provide a buried position identification device that can obtain stable detection accuracy regardless of the secular change of underground buried pipes and the fluctuation of the ground. The above and other objects and novel features of the present invention will be apparent from the description of the present specification and the accompanying drawings.

[0006]

The outline of the invention disclosed in the present application will be briefly described as follows.
The buried position identifying device of the present invention has a float having a center of gravity in the lower part and a wireless response tag installed therein on a non-volatile liquid injected into a sealed container, and the wireless response tag is an underground buried pipe. It is provided with a data carrier element storing the information of 1. and an antenna for transmitting and receiving a signal.

[0007]

[Operation] According to the above-mentioned means, the float in which the wireless response tag is installed is suspended on the non-volatile liquid, and the center of gravity is provided at the bottom of the float, so that the buried posture of the buried position identifying device changes. Even so, the wireless response tag is always held horizontally.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. Here, FIG. 1 is a cross-sectional view of a buried position identifying device according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating position detection of an underground buried pipe by the buried position identifying device according to an embodiment of the present invention. . Also, components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description thereof will be omitted.

In FIG. 1, the buried position identifying device 5 is such that approximately half of the non-volatile liquid 7 is injected into a spherical hermetic container 6 made of a non-metallic material, and the non-volatile liquid 7 has a lower portion below the hermetic container 6. A trapezoidal float 9 having a trapezoidal cross section, which is connected to the above via a fixed wire 8, is suspended. An eccentric weight 10 larger than the specific gravity of the nonvolatile liquid 7 is built in the wide lower part of the float 9, and a flat plate-shaped wireless response tag 11 is installed in the horizontal direction above the float 9.

The radio response tag 11 transmits / receives a signal to / from a data carrier element 12 in the center of the data carrier element 12 in which an individual number of underground buried pipe and management information, which will be described later, are stored and a detector on the ground, which will be described later. The antennas 13 are respectively installed inside. As shown in FIG. 2, the buried position identifying device 5 is installed on the underground buried pipe 14 or in the vicinity thereof, and the worker 15 searches the wireless response tag 11 from the ground with the detector 16. When the detector 16 approaches the wireless response tag 11, the detector 16 outputs a carrier signal to the antenna 13. As a result, the information stored in the data carrier element 12 is read, transmitted from the antenna 13 and input to the detector 16, and the information such as the buried position of the underground buried pipe 14 is detected.

In this case, the float 9 remains on the non-volatile liquid 7 even if the posture and depth of the buried position identifying device 5 and the underground buried pipe 14 change due to the secular change or the ground change. Since the float 9 is floated and the lower part of the float 9 is formed wide and has the eccentric weight 10, the wireless response tag 11 always keeps the horizontal state. Therefore, the relative attitude between the antenna 13 of the wireless response tag 11 and the antenna (not shown) of the detector 16 on the ground can be made constant, and the buried position (including the buried depth) of the underground buried pipe 14 can be detected. It is possible to prevent a decrease in accuracy.

Further, the buried position identifying device 5 can be easily installed and installed even on the underground buried pipe 14 having a slope, which can shorten the construction period and reduce the cost, and the low output detector 16 can also detect the detection depth. Can be increased, and a wide range of position detection of the underground buried pipe 14 becomes possible. Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the embodiments and various modifications can be made without departing from the scope of the invention. Needless to say.

[0013]

The effects obtained from the invention disclosed by the present application will be briefly described as follows. According to the embedded position identifying device of the present invention, the float in which the wireless response tag is installed is suspended on the non-volatile liquid, and the center of gravity is provided below the float, so that the embedded posture of the embedded position identifying device changes. Even so, the wireless response tag always maintains the horizontal state. Therefore, it is possible to stably obtain the detection accuracy of the buried position of the underground buried pipe.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embedded position identifying device that is an embodiment of the present invention.

FIG. 2 is a diagram for explaining position detection of an underground buried pipe by a buried position identifying device according to an embodiment of the present invention.

FIG. 3 is a perspective view of a conventional buried position identifying device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Glass tube 2, 12 ... Data carrier element 3, 13 ... Antenna 4 ... Resin case 5 ... Embedded position identification device 6 ... Sealed container 7 ... Nonvolatile liquid 8 ... Fixed wire 9 ... Float 10 ... Eccentric weight 11 ... Wireless Response tag 14 ... Underground underground piping 15 ... Worker 16 ... Detector

Claims (1)

[Claims] 1. A non-volatile liquid is injected into a sealed container,
A float having a center of gravity at the bottom is suspended above the non-volatile liquid, and a radio response tag is internally provided in the float, and the radio response tag transmits and receives a signal to and from a data carrier element storing information of underground buried pipe. An embedded position identifying device comprising an antenna for performing.