JPH0531727B2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention measures the position of a buried pipe or a pipe installed above ground by running a measuring device equipped with a gyroscope in a measuring pipe inserted into the pipe. This invention relates to a measurement method for measuring the position of a pipeline.

(Prior art) Conventionally, to measure the position of shielded conduits and cable storage conduits, a gyroscope that can measure the angle of inclination in the horizontal and vertical directions has been used, as disclosed in Japanese Utility Model Application Publication No. 52-54648. There is a method in which a built-in angle measuring device is moved within the buried pipe and the angle of inclination of the buried pipe is measured at each point using this angle measuring device to measure the position and bending state of the buried pipe.

(Problem to be solved by the invention) In this measurement method, the angle measuring device is guided along the wall of the buried pipe, so if the buried pipe has a large diameter, the angle measuring device is run on the central axis of the buried pipe. That's difficult. Therefore, for large-diameter buried pipes, it is conceivable to extend a measuring pipe along the central axis of the buried pipe and run an angle measuring device inside this measuring pipe.

However, when attempting to arrange the measurement pipe on the central axis of the pipe, the cables, earth removal devices, etc. attached to the pipe become obstacles. In addition, the work efficiency of measurement and installation is low because the position of the measurement tube is precisely aligned with the central axis. Furthermore, the inner diameter of the pipe that allows a worker to install the measuring pipe is limited. For example, in a small diameter pipe of 1 m or less, it is difficult to install a measuring pipe due to work space, and in a large diameter pipe of 3 m or more, it is extremely difficult to install a measuring pipe on the central axis of the pipe.

Therefore, an object of the present invention is to provide a measuring method in which a measuring tube that guides a measuring device can be installed extremely easily, and the locus of the central axis of the pipeline can be obtained even when the measuring tube is installed on the inner wall of the pipeline. It is something to do.

(Means for Solving the Problems) This invention moves a measuring device equipped with a gyroscope and an inclinometer in the axial direction within a pipe, and uses the gyroscope and inclinometer to measure the azimuth angle, the inclinometer, and a separately installed measuring device. In a method of measuring the position of a conduit by continuously detecting the moving distance of a measuring device obtained by a long instrument and determining the moving trajectory of the measuring device from these detected data, a conduit is placed on the inner wall side of the conduit. A measuring tube is extended parallel to the central axis of the measuring tube, the measuring device is loosely fitted into the measuring tube, distance data between the central axis of the measuring tube and the central axis of the conduit is measured, and this data is calculated. This process determines the position of the central axis of the pipe.

(Function) By moving the measuring device inside the measuring tube, the position of the central axis of the measuring tube can be measured. Since the central axis of the measuring tube and the central axis of the conduit are parallel, and the mutual positional relationship and distance between the central axis of the measuring tube and the conduit are known in advance, this data By correcting the position of the central axis of the measuring tube measured above, the position of the central axis of the pipe can be determined.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 and 2 show an example in which the present invention is applied to a buried pipe that is being dug. An excavator 3 is attached to the tip of a vertical shaft 2 dug vertically from the earth's surface 1, and a propulsion pipe 4 is inserted into the ground. I will bury it inside. This propulsion pipe 4 is connected from the end close to the excavator 3 to the end on the shaft 2 side.
A measuring tube 5 with a small diameter is inserted and fixed at a fixed position in the upper center of the inner wall, and a cart 8 equipped with a gyroscope 6 and an inclinometer 7 is inserted into this measuring tube 5. A motor 9 is mounted on the tower so that it can run on its own, and one end of a cable 10 that also serves as a signal line is attached to one end of the cart 8, and the other end of this cable 10 is connected to appropriate rollers 11, 12 and a length measuring device 13. through the drum 14 of the cable winding machine 14.
Fix it to a. When the start button of the drive motor 9 of the trolley 8 is pressed in the control box 15 to which the cable winder 14 is connected, the drive motor 9 of the trolley 8 is driven via the cable 10, and the trolley 8 is moved to the measuring tube 5. Run inside. At this time, the cable 10 is let out from the drum 14a of the cable winding machine 14, and the length of the cable 10 is measured by a length measuring device 13.
Measure with. A gyroscope 6 on a trolley 8 running inside this measuring tube 5 determines the direction of the spot, and an inclinometer 7
detects the degree of inclination, respectively, and continuously measures the position on the spot using an accelerometer and a calculator (not shown) provided in the length measuring device 13, the trolley 8, or the control box 15. This measurement is recorded in a recording device installed in the control box 15, and can be displayed on a CRT 16 as a display device connected to the control box 15 if necessary, and can also be printed out with a printer 17 and taken out as a chart. be. When the cart 8 reaches the end of the measuring tube 5 close to the excavator 3 in this way, the reversing switch 21 of the cart 8 hits a contact (not shown) provided at that location, which causes the drive motor 9 to and the drum 14a of the cable winder 14
is reversed, and while the cable 10 is being wound up by the winding machine 14, the trolley 8 returns to the end on the shaft 2 side.

3 and 4 are inserted into the measuring tube 5,
This figure shows a truck 8 equipped with a drive motor 9, an inclinometer 7, a gyroscope 6, etc. Wheels 18 are provided on both the front and rear sides of the truck 8, the outer circumference of which is curved to approximately match the inner circumference of the measuring tube 5. The rotation of the drive motor 9 is transmitted to the wheels 18 via a drive sprocket 19. Further, side rollers 20 that are free to rotate are provided adjacent to these wheels 18, and a switch 21 for reversing the drive motor 9 is provided at the front end of the truck 8.

In this embodiment, as shown in FIG. 4, the cart 8 has a cross section slightly smaller than the cross-sectional diameter of the measuring tube 5, so the cart 8 runs inside the measuring tube 5 along the central axis of the measuring tube 5. , there is no meandering around the inner periphery of the measuring tube 5. Moreover, since the detectors such as the gyroscope 6 and the inclinometer 7 are made to correspond approximately to the central axis position of the measuring tube 5, detection is performed at these central axis positions. Therefore, if you measure the length between the center axis of the propulsion tube 4 and the center axis of the measurement tube 5 in advance, you can add this length using the above calculator, etc., and directly measure the position of the center axis of the propulsion tube 4. becomes possible.

In this way, in this embodiment, when the propulsion pipe 4 is buried by the excavator 3, the trolley 8 is run inside the measurement pipe 5, the buried position of the propulsion pipe 4 is projected on the CRT 14, and the excavator 3 is moved according to the planned course. The tip of the propulsion tube 4 can be made to reach the target point (point P on the CRT 16 in FIG. 2) while correcting the direction.

Although the above embodiment measures the position of a buried pipe that is being dug, the method of the present invention is not limited to this, and can be used for existing buried pipes, and can also be used for pipes installed above ground. be.

(Effects of the Invention) Installing the measuring tube while accurately aligning the central axis of the measuring tube with the central axis of the conduit is an extremely time-consuming and complicated task, but with this invention, this is not necessary. The work of installing the pipe is easy. In addition, since the measurement pipe is installed close to one side of the inner wall of the pipeline, the measurement pipe is not obstructed by the cables or earth removal equipment attached to the pipeline, especially when the pipeline is being excavated. The space on the road can be used effectively.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the device used in this invention, and Figure 2 shows the location of buried pipes by the method of this invention.
FIG. 3 is a side view of a cart in a measurement conduit used in the present invention, and FIG. 4 is an enlarged sectional view taken along the line A--A in FIG. 3. In the figure, 1 is the ground surface, 2 is the shaft, 3 is the excavator, 4 is the propulsion pipe, 5 is the measurement pipe, 6 is the gyroscope, and 7
is an inclinometer, 8 is a trolley, 9 is a drive motor, 10 is a cable, 13 is a length measuring device, 14 is a cable winder,
15 is the control box, 16 is the CRT, 1
7 has a printer.

Claims (1)

[Claims] 1 A measuring device equipped with a gyroscope and an inclinometer is moved in the axial direction within the pipe, and the gyroscope and inclinometer continuously measure the azimuth and inclination angle, and the distance traveled by the measuring device obtained by a separately installed length measuring device. In the method of measuring the position of a conduit by detecting the position of the conduit and determining the movement trajectory of the measuring device from these detected data, a measuring pipe is installed on the inner wall side of the conduit in parallel with the central axis of the conduit. , the measuring device is loosely fitted into this measuring pipe, the distance data between the central axis of the measuring pipe and the central axis of the conduit is measured, and this data is processed to determine the position of the central axis of the conduit. A method for measuring the position of a conduit.