JP2005091215A - Relative position detecting device of piping - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent fracture of piping connection sections and leakage of fluid from connected parts by detecting an inclination degree of piping, without digging up buried piping. <P>SOLUTION: The relative position detecting device of piping is composed of a relative position detecting part 3 fixed to piping having nearly a U shape, a metering device 5 with a pair of detection parts 5a, 5b installed on the ground, a connection pipe 13 for connecting both ends 3a, 3b of the relative position detecting part 3 and the respective detection parts 5a, 5b of the metering device 5, and a working medium 6, comprising two kinds of liquids which are accommodated in piping, possessing different specific gravities respectively and which do not blend with each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pipe relative position detection device suitable for detecting, for example, an inclination due to pipe sinking in a pipe line buried in the ground.

  A sewer or water supply pipe line buried in a creation site or the like is configured by connecting pipes to each other through a flexible pipe joint. When an unequal inflection due to ground deformation such as an earthquake occurs, a change occurs in a part of the piping line. Since the fluctuation amount of the pipe generated in such a pipe line is designed to be absorbed by the flexibility of the flexible pipe joint arranged between the pipes, the fluctuating pipe and the flexible pipe joint The connecting portion is not broken and fluid does not leak from the connecting portion.

  However, since sewerage and waterworks piping lines are connected to each other via a pipe joint, when external pressure or internal pressure is applied to the piping line, some piping of the piping line is predetermined. It may tilt more than the value.

  If the amount of subsidence of piping due to fluctuations in the piping line is within the specified range, the connection between the piping and the flexible fitting will not break or fluid will leak from the connection. However, if the amount of subsidence of the piping in the piping line becomes a large amount exceeding a predetermined value, the flexible pipe joint and piping of the piping line may be damaged, which may cause a serious disaster in some cases.

  In addition, in the sewer piping line, the sewage flowing through the piping line flows due to the action of gravity. When the pipe is inclined in the direction opposite to the flow direction of the sewage, the sewage flowing through the pipe stays and the sewage does not flow efficiently along the pipe line. The present invention has been made in consideration of the above points, and an object of the present invention is to provide a relative position detection device for piping that can be remotely monitored with a simple structure and the amount of subsidence and inclination of piping in a piping line.

  The pipe relative position detection device according to the present invention has a substantially U-shaped relative position detection unit fixed to the pipe, a pair of detection units installed on the ground, and both ends of the relative position detection unit. It is comprised from the connection pipe | tube which connects each detection part of a measuring device, and the working medium of the two types of liquid with which the specific gravity accommodated in the pipe line differs, and the other does not melt | dissolve.

  The relative position detection device for piping according to the present invention detects the difference in height of the working medium by a measuring device installed on the ground, and monitors the amount of inclination of the piping in the piping line, thereby digging the piping without digging up the piping. The amount of settlement can be detected, and leakage of fluid from the pipe connection part of the pipe line can be prevented.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, the relative position detection device 1 for piping according to the present invention includes a relative position detection unit 3 fixed to the piping 2 of the piping line, a measuring device 5 installed on the ground 4, It has a working medium 6 accommodated in a pipe line connecting the position detector 3 and the measuring device 5.

  The relative position detector 3 is formed of a rigid tube having a substantially U shape as a whole and bent at both ends 3a and 3b in the same direction. The relative position detector 2 has a rectangular space 7 surrounded by a rigid tube. The relative position detector 2 is disposed on the outer surface of the pipe 2 of the pipe line buried in the ground so that each leg portion of the rigid pipe extends in parallel with the axis of the pipe 2 and is attached to the pipe 2 by the mounting device 8. .

  The measuring device 5 includes two transparent cylinders 5a and 5b having the same configuration and a scale 9 positioned between the transparent cylinders 5a and 5b. The measuring device 5 is installed at a position where workers on the ground 4 can easily access. The height of the liquid level of the transparent cylinders 5a and 5b of the measuring device 5, that is, the difference between the liquid levels of the transparent cylinders 5a and 5b is read by the scale 9.

  The attachment device 8 includes a band 10 attached to the outer surface of the pipe 2, a fixing plate 11 attached to the band 10, and a fixing means 12 that fixes the band 10 to the pipe 2. The fixed plate 11 is disposed in the rectangular space 7 formed by the relative position detector 3, and maintains the relative position detector 3 in a predetermined shape.

  The transparent cylinders 5 a and 5 b of the measuring device 5 are connected to both end portions 3 a and 3 b of the relative position detection unit 3 by flexible tubes 13 and 13. Thereby, the pipe line 14 which connects one transparent cylinder 5a and the other transparent cylinder 5b of the measuring device 5 is formed.

  The working medium 6 is composed of two types of liquids 6a and 6b, which are two kinds of liquids having different specific gravities and in which the two are not compatible. As an example, the working medium 6 is water and kerosene. The working medium 6 is placed in a conduit 14 connecting the transparent cylinder 5a and the transparent cylinder 5b of the measuring device 5 so that the liquid level is within the range of the scale 9 of the transparent cylinder 5a and the transparent cylinder 5b.

Next, the operation will be described.
The pipe relative position detecting device 1 according to the present invention is attached to a pipe 2 of a pipe line, and at the stage where the pipe line is buried in the ground, as shown in FIG. Since they are arranged, there is no sinking phenomenon that moves in the vertical direction in the pipe 2, and the liquid levels of the transparent cylinders 5a and 5b of the measuring device 5 are at the same height level.

  When ground subsidence occurs in a pipe line buried in the ground, the pipe 2 near the place where the ground subsidence occurs sinks by a subsidence amount δ as shown in FIG. When the pipe 2 is displaced by the subsidence amount δ, the relative position detector 3 attached to the pipe 2 is also displaced by the subsidence amount δ.

  When the position detection unit 3 is displaced by the subsidence amount δ, the working medium 6 in the pipe line 14 maintains the same liquid level in the relative position detection unit 3 due to the difference in specific gravity between the liquid 6a and the liquid 6b. To move.

  When the liquid 6a having a high specific gravity of the working medium 6 moves in the position detector 3, the liquid level of one transparent cylinder 5a of the measuring device 5 rises with the movement of the liquid 6a having a high specific gravity, and the other transparent cylinder. The liquid level 5b is lowered, and a liquid level difference e is generated between the liquid level of the transparent cylinder 5a and the liquid level of the transparent cylinder 5b. The subsidence amount δ of the pipe 2 is detected from the liquid level difference e.

  The relationship between the liquid level difference e between the transparent cylinder 5a and the transparent cylinder 5b of the measuring device 5 and the amount of fluctuation δ in the vertical direction in the distance L of the pipe 2 is as follows. And the difference in specific gravity.

The inclination angle θ of the pipe 2 is calculated from θ = sin ⁻¹ (σ / L).

  Moreover, the relative position detection device 1 according to the present invention can be arranged in each of a plurality of pipes of the piping line, and the detection values of each relative position detection device can be centrally managed by the measurement device.

  The pipe relative position detecting apparatus according to the present invention can remotely monitor the amount of subsidence of pipes buried in the ground and the amount of slope gradient of pipes placed on the ground or underground.

It is a figure when the piping of the relative position detection apparatus of piping by this invention exists in a normal position. It is sectional drawing along the AA line of FIG. It is a figure when the piping of the relative position detection apparatus of piping by this invention exists in a subsidence position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Relative position detection apparatus 2 Piping 3 Relative position detection part 5 Measuring apparatus 5a Transparent cylinder 5b Transparent cylinder 6 Working medium 8 Mounting apparatus 13 Connection pipe

Claims (3)

  In a pipe line in which a plurality of pipes are connected via flexible pipe joints, a relative position detector that is substantially U-shaped and fixed to the pipe, a measuring device that has a pair of detectors and is installed on the ground, A connecting pipe that connects both ends of the position detection unit and each detection unit of the measurement device, and two working liquids having different specific gravities accommodated in the pipe and a working medium that is a liquid that does not mix with each other. A relative position detection device for piping.   2. The pipe according to claim 1, wherein the relative position detection unit includes a rigid pipe formed in a substantially U shape, and each leg portion of the rigid pipe is arranged to extend in parallel with an axis of the pipe. Relative position detection device.   The relative position detection device for a pipe according to claim 1 or 2, wherein a plurality of relative position detection devices are respectively arranged on a plurality of pipes, and the detection values of each relative position detection device are centrally managed by a measuring device.

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