JPS58123415A - Position detecting method of buried pipe - Google Patents

Abstract

PURPOSE:To improve the working accuracy when pipe is buried by nonexcavating work, by installing either a detector or liquid tank at a measuring point in the buried pipe, and measuring the position change in the vertical direction at the measuring point as the pressure difference of the detector. CONSTITUTION:The laying work of the pipe 6 is performed by the following procedure. The liquid tank 2 is installed at an arbitrary measuring point A in the buried pipe 6, and the detector 1 is provided at an arbitrary position of a starting vertical shaft 8 or at the outside of the shaft. A pressure gage is used as the detector 1, and it is connected to a recorder 4. The liquid tank 2 and the detector 1 are connected by a hose 3 through the buried pipe 6, and the inside is filled up with liquid such as water. When the liquid tank 2 at the measuring point A is displaced by DELTAh in the vertical direction, pressure change -w.DELTAh is yielded. This is detected by the detector 1 and recorded by the recorder 4. When the position of the measuring point A is found to be deviated from a programmed line by the recorder 4, the direction is appropriately corrected. Since the position change of the measuring point in the vertical direction is detected as the pressure change, the measuring range is not limited and the continuous measurement can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a method for detecting the position of a laid pipe, which is used to improve accuracy when laying a laid pipe by a trenchless method such as a thrust method or a shield method.

When installing a waterfall pipe using trenchless construction methods such as the propulsion construction method or the shield construction method, the position of the cutting edge O should be detected to improve construction accuracy, and if it deviates from the measurement ii*, the direction should be corrected as appropriate. There is a need.

Therefore, early detection of deviations from total 1IIS and detection accuracy are important in stock construction. In addition, in the case of construction, the detection range is large and if the measurement point is displaced beyond the radius of the installed pipe, it is difficult to detect with conventional methods.There are two conventional methods for detecting the position of the installed pipe. law is being practiced.

b) Transit method (see Figure 6) Visually measure the position of the target 11 attached to the rear of the blade lower at the tip of the waterfall pipe 6 from the starting shaft 8 using the transit 10, and check the deviation from the planned line. This is a detection method, and the survey is carried out after moving one permanently installed pipe 6.However, there are the following problems.

■Due to the difficulty of surveying during propulsion, there is a delay in discovering deviations in the position of the cutting edge from the planned line, making it difficult to make appropriate direction corrections.

■ Human error may occur due to visual surveying. As the reed propulsion distance increases, the surveying error increases.

■ If the position of the cutting edge is displaced by more than 60 radii of the ring pipe when constructing a curve, it is not possible to directly survey from the starting shaft 8, so it is necessary to move the transit 10 within the pipe, which tends to cause errors and is time consuming.

■ Since visual surveying is required, there must be no obstruction between the target 11 and the transit 10, and a linear space is required, which limits the space within the excavated pipe 6. In addition, it is necessary to install the O-moat pipe 6 in the starting shaft 8 and the rear heating section of the transit 10, which limits the work space.

(1) Method using a laser beam (see No. 7511) A method that utilizes the straightness of the laser beam, in which a laser beam is emitted from the P1 launch shaft using a laser oscillator 12, and a light receiving plate is attached as a target to the rear of the cutting edge. 13 to detect positional deviation at 0 light receiving position.) The method for detecting the position is by photographing the light receiving plate 15 with a TV camera and viewing the light receiving position on the screen outside the mine. In this method, a light receiving element that reacts to the laser beam is aligned with the light receiving plate 13, and the reaction of the light receiving element that is hit by the laser beam is converted into an electrical signal.
There are various methods of detection.

However, these methods also have the following problems.

■ When constructing a curved line, if the light receiving plate position is displaced by more than 60 radii of the buried pipe, direct measurement will not be possible.

However, although it can be measured by using a prism, there are problems with accuracy.

(2) Since the straightness of the laser beam is utilized, there must be no obstruction between the laser oscillator 12 and the light receiving plate 13, and the space within the buried pipe 6 is restricted.

■ Accuracy decreases as the propulsion distance increases.

In order to solve the problems with the conventional methods mentioned above, this invention has the following features: ■ There is no limit to the measurement range for changes in the vertical position of a fixed point, and it can be applied to position detection during AM construction. The detection accuracy is good even when moving, the position detection can be performed continuously during θ propulsion, there is no restriction on the surface of the trench pipe and the starting shaft, ■#j
Multiple fixed points can be detected simultaneously and continuously.
It was developed with five points as goals for improvement.

The present invention will be described below based on illustrated embodiments (FIGS. 1 to 5).

FIG. 1 shows the basic configuration of the device used in this invention, which consists of a detector 1, a liquid storage tank 2, and a hose 5 that connects them. Then, for example, by capturing a change in the vertical position of the liquid storage tank 2 installed at a measurement point as a pressure change due to a water level difference, the position of the blade tip during propulsion can be detected.

FIG. 2 shows an example of a measurement method, in which a liquid storage tank is installed at a measurement point within the trenched pipe 6. A pressure needle is used as the detector 1, installed at an arbitrary position outside the buried pipe 6, and a recorder 4 is used.
Connect to. and connect the hose 5 between the liquid storage tank 2 and the detector 10.
and fill it with water, oil, or other liquid. If the unit volume weight of the liquid is W (P/II") and the measurement point is displaced by Δh (cIII) in the vertical direction, a pressure change -W・Δh (), /11) occurs and is detected by the detector 1. do.

FIG. 3 shows a case where, in the method shown in FIG. 2, the positions of the detector 1 and the liquid storage tank 2 are reversed and the detector 1 is installed at the measurement point.

The method shown in FIG. 4 differs from the method shown in FIG. 2 in that it uses a liquid column type pressure needle of the manometer 11 and captures changes in the vertical position of the measuring point as changes in the water level.

FIG. 5 specifically shows how the position is detected by the method of the present invention when laying the buried pipe 6, and the work is carried out in the following steps.

■ Install the liquid storage tank 2 at any measurement point within the buried pipe 6.

■ Install the detector 1 in the starting shaft 8t or at any position outside the mine.

(2) Use a pressure needle as the detector 1 and connect it to the recorder 4.

■ Pass through the buried pipe 6 and connect the liquid storage tank 2 and the detector 1 with a hose 3, and fill the inside with liquid such as water.

■ In this state, when the liquid storage tank 2 at measurement point A is displaced by Δh in the vertical direction, a pressure change of −W·Δh occurs, which is detected by the detector 1.
Detected by , and recorded by recorder 4.

(2) If it is determined by the recorder 4 that the position of the measurement point deviates from the planned line, the direction is corrected as appropriate.

Note that since the detector 1 is used as a reference point in this case, it must be kept at a constant height during the measurement.

As a modification of this embodiment, a pressure needle is installed as a detector 1 at a measuring point in the excavation pipe 6, and a liquid storage tank 2 is installed at an arbitrary position inside the starting shaft 8 or outside the hole. There is a method of detecting a change in the vertical position of a measuring point as a pressure change using the detector 1. The present invention has the above-described advantageous features of the p1 order.

(1) Since the vertical position change of the ill fixed point is detected as a pressure change, there is no limit to the measurement range and continuous measurement is possible.

(2) If the measurement distance is long, it is sufficient to simply extend the hose, and there is no problem with accuracy.

3) The detector can be installed anywhere in the starting shaft and does not limit the work space.

(4) Since the detector and the liquid storage tank are simply connected with a hose, there is no need for a linear space within the buried pipe for surveying, and the work space is not restricted.

(5) By using a plurality of devices, changes in the vertical position of a number of measurement points can be detected simultaneously and continuously.

(6) It can be easily adapted to tunnels with upper and lower sheaths.

[Brief explanation of drawings]

Fig. 1 is a front view showing the basic configuration of the device used in this invention, Figs. 2 to 4 are front views showing an outline of the position detection method, and Fig. 5 is a front view showing the position of the buried pipe according to the invention. FIG. 6 is a sectional view showing an overview of detection; FIG. 6 is a sectional view showing position detection using a conventional transit; FIG. 17 is a sectional view showing position detection using a conventional laser. 1...Detector, 1a...Manometer, 2...Liquid storage tank, 3
...Hose, 4.Recorder, 5.Following cable, 6.
・Installation pipe, 7. Blade opening, 8. Starting shaft, 9. Propulsion jack, 10. Transit, 11. Target, 12. Laser oscillator, 15. Light receiving plate. Figure 1 Figure 2

Claims (1)

[Claims] (1) Connect the detector equipped with a pressure needle and the liquid storage tank with a hose, install one of the liquid storage tanks with the broken detector at the measurement point in the installation pipe, and place the other one in the installation pipe. The IIO detects the change in the vertical position of the measurement point by installing it at an arbitrary position outside the
A method for detecting the position of a pilot pipe using adjustment as a pressure difference.