JP2573913B2 - Method and apparatus for measuring attitude of tip conductor and buried pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring the posture of a conductor or a buried pipe, such as a sewer or a waterworks, buried in the ground by a propulsion method, and more particularly to a method and a method for propelling a curve. And a method for measuring the attitude of a leading conductor and several buried pipe rows following the leading conductor.

[0002]

2. Description of the Related Art In a propulsion method, in order to lay a buried pipe in accordance with a planned value, it is necessary to detect an accurate posture of a leading conductor at an end and a row of buried pipes at an early stage and correct it in a correct direction. Is an important requirement. In general, as a method of detecting a posture, a method of sequentially measuring from a base point in a starting shaft to a leading conductor at a tip by using an optical device is used. In the case where the propulsion section is a straight line and a long distance, laser-based optical equipment is used, and a method of measuring a deviation from a reference line by irradiating a laser on a target installed in a leading conductor has become mainstream. .

[0003] However, in the propulsion method in which the propulsion section includes a curve, it is impossible to see the lead conductor, and it is impossible with the above-described optical device method using a laser. Traverse surveys up to this point and a method of continuously detecting the azimuth of the leading conductor by mounting a gyro compass for detecting the bearing in the leading conductor are adopted.

[0004]

However, in the prior art described above, particularly in the case of curved propulsion, complicated traverse surveying from the starting point in the starting shaft to the measuring point of the leading conductor (in the case of curving, the prospect of the leading conductor is difficult). Therefore, surveying for position confirmation is generally performed two to three times during propulsion of one buried pipe.) The propulsion work is interrupted each time surveying is performed. Furthermore, as the propulsion distance becomes longer, a great deal of time is spent on surveying work, which leads to a significant reduction in propulsion work time, delays in propulsion work, and shortens the surveying time, resulting in cumbersome surveying work. Mismeasurement of the position of the leading conductor often occurs, which is a problem that deviates greatly from the planned value.

In the method of mounting a gyro compass or the like in the leading conductor, it is possible to always detect the azimuth of the leading conductor. Since the bulge often deviates from the planned curve without following the trajectory of the body, it is necessary to grasp the attitude of several buried pipe rows following the leading conductor. For this reason, at present, traverse survey of buried pipes is performed at the time of propulsion construction. further,
The construction of gyrocompasses and the like is extremely complicated and precise, requiring careful handling, and the price is extremely high, which is putting pressure on the overall construction cost. Is the current situation.

The present invention has been made in view of the above-mentioned problems of the prior art, and provides a method and an apparatus capable of efficiently and easily measuring the attitude of a row of buried pipes even in a method of propulsion from a small-diameter pipe to a large-diameter pipe.

[0007]

That is, according to the present invention, an outer cylinder having a length smaller than the inner diameter of a buried pipe and substantially the same as the axial length of the buried pipe is inserted into the inner wall of a plurality of buried pipe rows following the leading conductor. The connecting device is installed at the upper and lower or left and right positions of the end of the outer cylinder so as to be bendable, and one of the end surfaces of each outer cylinder is provided with a plurality of length measuring devices installed at predetermined positions in the circumferential direction. A method for measuring the attitude of a buried pipe or a buried pipe, comprising measuring a separation length of a tube connecting portion and calculating an attitude of a row of buried pipes following the preconductor based on the obtained separation length data.

[0008] Further, the present invention provides a buried pipe having an inner diameter smaller than an inner diameter of the buried pipe.
A plurality of outer cylinders having a length substantially the same as the length of the buried pipe in the axial direction, a connecting device installed at a vertical or horizontal position so as to be bent at each outer cylinder connecting portion; A posture measuring device for a leading conductor or a buried pipe, comprising a plurality of length measuring devices installed at predetermined positions in a direction.

The outer cylinder is made of a relatively strong steel material. Cylinders that can be extended and contracted in the radial direction are provided at target positions on both side surfaces of the outer cylinder, and a fixing device provided with a support plate is installed at the tip thereof. The method of installing the outer cylinder in the buried pipe is as follows: For small diameter pipes, extend the cylinder to support the support plate by abutting the inner wall of the buried pipe, and for large diameter pipes, bury one support plate It is fixed by being attached to the inner wall surface of the pipe.

A commonly used potentiometer or the like is used as a length measuring device installed on one of the end surfaces of the outer cylinders. When measuring a posture in only one direction, a vertical direction or a horizontal direction, a vertical target position is used. Or two symmetrical positions. When measuring postures in two directions, three to four measuring devices are installed at predetermined positions, and the posture is calculated by measuring the separation length between the outer cylinders.

[0011] As connecting devices for connecting the outer cylinders, two connecting devices are provided at upper and lower positions or at left and right positions so as to be able to bend in a planned curved direction. As the structure of the connecting device,
A generally used pin structure may be employed.

[0012]

According to the above-mentioned invention, the outer cylinder follows the bending angle of the buried pipe row and forms the same bending angle. Therefore, if the separation length between the outer cylinders can be measured, the outer cylinder diameter and the outer cylinder length are determined. Thereby, the postures of the leading conductor and the buried pipe row can be easily calculated.

In mounting the posture measuring apparatus of the present invention, a plurality of outer cylinders are fixed to the buried pipe by abutting or attaching the support plate to the inner wall of the buried pipe. This device can be easily removed by removing the attachment. Furthermore, since the present apparatus uses a method of fixing the inner wall of the buried pipe with a support plate mounted on an outer cylinder having a relatively small diameter, a wide range from a small diameter pipe to a large diameter pipe can be adopted.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view for explaining a method of measuring the attitude of a buried pipe row according to an embodiment of the present invention. The outer cylinders 1 each having a length smaller than the inner diameter of the buried pipe 7 and having substantially the same length are inserted into a plurality of buried pipes 7 subsequent to the leading conductor 6. The connecting portions at both ends of each outer cylinder 1 are connected to bendable by connecting connecting devices 8 provided at upper and lower positions with insertion pins 9. In addition, length measuring devices 2 are installed on the right and left sides of the flange portion at the tip end of each outer cylinder 1 at equal positions in the circumferential direction, and the separation length between the leading conductor 6 and the outer cylinder 1 and each outer cylinder 1 is measured. Is done. Furthermore, cylinders 5 that can be extended and contracted in the radial direction are provided at target positions on both side surfaces of each outer cylinder 1, and a fixing device 3 provided with a support plate 4 is installed at the tip thereof.

FIG. 2 is a front view for explaining a situation in which the outer cylinder 1 is installed in the buried pipe 7. The outer cylinder 1 inserted into the buried pipe 7 extends the cylinder 5 of the fixing device 3 installed on both side surfaces of the outer cylinder 1, and fixes the support plate 4 by contacting the inner wall surface of the buried pipe. A length measuring device 2 for measuring a separation length of each connection portion is provided at a symmetrical position on a flange portion of an end surface of the outer cylinder 1. In addition, a connection device 8 composed of two upper and lower plates is provided at the upper and lower positions of the flange portion. As a connection method, the connection is performed by inserting the one-plate connecting device 8 at the other end into the two-plate connecting device 8 and inserting the pin 9.

FIG. 3 is a plan view for explaining the outer cylinder 1 in detail. A fixing device 3 for fixing the outer cylinder 1 in the buried pipe 7 is provided on both side surfaces at the center of the outer cylinder 1.
At one end of the outer cylinder 1, a measuring device 2 for measuring a separation length between the outer cylinders 1 is installed on the left and right. Above and below the flanges at both ends of the outer cylinder 1, connection devices 8 for connecting the respective outer cylinders 1 are provided. .

FIG. 4 is a front view for explaining the installation state of the outer cylinder 1 when the diameter of the buried pipe 7 is large. As a method of installing the outer cylinder 1, a buried pipe 7 is bolted or the like using a hole provided in the support plate 4 of the fixing device 3 installed in the outer cylinder 1.
A method of fixing to the inner wall surface is used.

In the present embodiment, the method of installing the connecting device 8 up and down has been described assuming that the curve plan of the propulsion method is in the horizontal direction. , The installation position of the connection device 8 is a symmetric position. As the measuring device 2 for measuring the separation length, a generally used potentiometer, a non-contact type optical sensor, or the like is used. For installation location,
Although the method of installing two measuring devices 2 on the left and right of one end of the outer cylinder 1 has been exemplified, if it is desired to simultaneously measure both the horizontal and vertical postures, the measuring devices 2 may be provided at three to four positions. It becomes possible by installing it in multiple places.

Next, a method for measuring the attitude of the buried pipe 7 using the present invention will be described below. When the propulsion of the leading conductor 6 is completed, the tip of the buried pipe 7 is inserted into the rear end of the leading conductor 6. At this time, the outer cylinder 2 is inserted into the buried pipe 7 and is fixed to the inner wall surface of the buried pipe 7 by the support plate 4 of the fixing device 3. Then, the rear end face of the buried pipe 7 is a main pushing device (not shown).
To complete the propulsion of the first buried pipe 7,
The next buried pipe is connected to the rear end of the first buried pipe 7. At this time, the outer tube 1 installed in the first buried tube 7 and the second buried tube 7 is also connected. When the installation of the plurality of rows of outer cylinders 1 planned in this way is completed, the leading conductor 6 and the first outer cylinder 1
The cable of the potentiometer, which is the measuring device 2 installed at the connection part between the outer cylinder 1 and the connection part between the outer cylinders 1, is connected to the processing system via the converter, and the position of the leading conductor 6 and the succeeding buried pipe 7 row is determined. Will be

Then, when the propulsion construction is resumed and the leading conductor 6 enters the curved section, the leading conductor 6 and the buried pipes 7 form a bend angle, and the outer cylinders 1 fixed in the buried pipes 7 also become bent. Following the bending angle of the seven rows of buried pipes, the directions between the outer cylinders 1 are relatively different, and a difference occurs between the inner and outer separation lengths. By measuring this separation length, each bending angle is calculated from the diameter and length of the outer cylinder 1 measured in advance, and the attitude of the leading conductor 6 and the buried pipe 7 row can always be accurately grasped.

When the propulsion work is completed, the cylinder 5 of the outer cylinder 1 is reduced or the bolts and the like of the support plate 4 are removed, and the outer cylinder 1 is removed from the buried pipes 7 and removed.

[0022]

According to the attitude measuring method and apparatus of the present invention, it is possible to always grasp the attitude of the leading conductor and the buried pipe row following it, and it is not necessary to use the surveying by optical equipment as in the prior art. Time required for surveying and the like can be significantly reduced. In addition, the configuration is relatively simple, low cost, and
It is possible to use from small diameter pipe to large diameter pipe,
Very economical.

Furthermore, in the case of a small-diameter pipe, in particular, the space inside the outer cylinder can be widely used as a place for installing earth-moving equipment and the like, which is very efficient.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating a method for measuring the attitude of a buried pipe row according to the present invention.

FIG. 2 is a front view for explaining a situation where an outer cylinder is installed in a buried pipe.

FIG. 3 is a plan view for explaining an outer cylinder in detail.

FIG. 4 is a front view illustrating a situation where an outer cylinder is installed in a large-diameter pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 External cylinder 2 Measuring device 3 Fixing device 4 Support plate 5 Cylinder 6 Lead conductor 7 Buried pipe 8 Connecting device 9 Pin 10 Bolt

Claims (2)

(57) [Claims] In a method for measuring the attitude of a leading conductor and a row of buried pipes behind the leading conductor, an outer cylinder having a length smaller than an inner diameter of the buried pipe and substantially equal to an axial length of the buried pipe is followed by the leading conductor. It is inserted into the inner wall of a plurality of buried pipe rows, and a connecting device is installed at the upper and lower or right and left positions of the end of the outer cylinder so as to be bendable. The distance measurement of each outer cylinder connecting part is measured by the length measuring devices, and the posture of the leading conductor or the buried pipe row subsequent thereto is calculated based on the obtained spacing length data. How to measure the posture of a buried pipe. 2. An apparatus for measuring an attitude of a leading conductor and a row of buried pipes behind the leading pipe, comprising: a plurality of outer cylinders having a length smaller than an inner diameter of the buried pipe and substantially equal to an axial length of the buried pipe; It is characterized by comprising a connecting device installed at a vertical or horizontal position so as to be able to bend at a tube connecting portion, and a plurality of length measuring devices installed at an equal position in a circumferential direction on one of the outer cylinder end surfaces. To measure the posture of the tip conductor or buried pipe.