JPH0776843A - Position detector of vertical hole excavator and detection method thereof - Google Patents

Abstract

PURPOSE:To accurately detect the horizontal position of an excavator even during the excavating work. CONSTITUTION:A liquid tank 17 is installed on the ground above a vertical hole 15 and a float 18 is equipped in the tank. One end of a wire 21 is fixed at the lower face of the float 18 and the wire 21 is wound around a sheave 22 supported on the upper end of excavator 11 and the other end of wire 21 is wound around a winch 23. The wire is wound off from the winch 23 as the ground is excavated to keep the float is in the floating state in the liquid tank 17. The horizontal deviation of the excavator 11 can be measured by detection of the horizontal position of the specimen 26 provided in the float 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device and method for detecting the position of a pit excavator, and more particularly to a device and method for detecting the position of a float and measuring the excursion of the excavator.

[0002]

2. Description of the Related Art When constructing a continuous underground wall or an underground pile, etc., an excavator is hung and inserted into a pit by a crane or the like, and the pit is dug by the excavator. In this case, the posture of the excavator may be disturbed, and in particular, when the excavator is displaced in the horizontal direction, the vertical hole is bent. Therefore, it is important to measure the excavator excursion with high accuracy.

As a device for measuring the horizontal excursion of an excavator, for example, a device disclosed in Japanese Patent Publication No. 61-24642 is known. Since the excavator suspended in the vertical hole is immersed in the stabilizing solution, the device described in the publication makes the wire attached to the excavator connect the float to float in the stabilizing solution.
The position of the excavator is detected by reading the position of this float.

[0004]

The device described in the above publication replenishes the stabilizing solution into the pit as the excavator excavates, so that the level of the stabilizing solution flows and the float oscillates. Further, during excavation work, the float swings due to the vibration of the excavator. Since the exact position of the excavator cannot be grasped when the float is in an oscillating state, excavation work must be interrupted until the liquid level becomes stationary.

Therefore, there is a technical problem to be solved in order to accurately detect the position of the excavator even during excavation work, and an object of the present invention is to solve this problem.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object, and is a position detecting device provided above the ground above a vertical hole during excavation. The float is floated inside the liquid tank, the detecting body is provided on the float, and means for detecting the horizontal position of the detecting body is provided. Furthermore, one end of the wire is locked to the float and the wire is suspended in the vertical hole. Lower it and wind it around a sheave pivotally attached to the upper end of the excavator, and further position the other end of the wire on a winch installed on the ground and detect the position of the vertical hole excavator, and with the excavation of the excavator. Position of the pit excavator for feeding out the wire from the winch, maintaining the float in the liquid tank at all times, and measuring the horizontal displacement of the excavator by detecting the horizontal position of the detection body. Position detection method by detection device It is intended to provide.

[0007]

Operation: The wire locked to the float is suspended in the vertical hole and wound around the sheave pivotally attached to the upper end of the excavator.
It is wrapped around a winch installed on the ground. When the excavator descends while excavating, the float tries to sink in the liquid tank by pulling the wire, but by unwinding the wire from the winch by the amount corresponding to the descending amount of the excavator,
The float keeps floating in the liquid tank.

The float floated in the liquid tank is provided with a detector, and when the excavator moves in the horizontal direction, the float also moves in the same direction. Therefore, if the horizontal position of the detector is detected. The excavator's horizontal excursion can be measured.

[0009]

An embodiment of the present invention will be described in detail below with reference to the drawings. In FIG. 1, reference numeral 11 is an excavator, which is suspended from a dedicated slag 12 by a wire 13 and is located in a vertical hole 15 filled with a stabilizing liquid 14.
One or a plurality of position detection devices 16 are provided above the vertical hole 15 and the float 1 is placed inside the liquid tank 17.
Float 8. The liquid tank 17 is placed on a pedestal 19 and is movable on a fixed base 20 integrally with the pedestal 19, and one end of a wire 21 is locked to the float 18 to form the liquid tank 1.
7 is suspended from the opening 17a. Then, a sheave 22 is pivotally attached to the upper end of the excavator 11, the wire 21 is wound around the sheave 22, and the other end of the wire 21 is wound around a winch 23 installed on the fixed base 20 on the ground. To do. When the excavator 11 is installed or pulled up, the pedestal 19 is slid to the rear of the fixed base 20 to retract the position detecting device 16 from above the vertical hole 15.

2 to 4 show the main part of the position detecting device 16, wherein the liquid tank 17 is cylindrical and has a cylindrical opening 17a at the center thereof. The inside of the liquid tank 17 is filled with a liquid 24 such as water, and the upper portion of the liquid tank 17 is covered with an upper lid 25. The liquid 24 in the liquid tank 17 has a viscosity of 50 to 200.
It is about cp, and is preferably a Newtonian fluid or a non-Newtonian fluid in a narrow sense when classified by the rheological characteristics of the fluid.

The float 18 floating in the liquid 24
Is composed of a donut-shaped floating body 18a and a circular plate 18b fixed to the upper portion of the floating body 18a.
The detection body 26 is provided so as to project at the center position of the plate 8, that is, the upper surface of the central portion of the plate 18b, and the installation base 27 is fixedly provided on the lower surface of the upper lid 25 above the float 18, and the detection body 26 is mounted on the installation base 27. A non-contact type displacement gauge 28 is provided as means for detecting the horizontal position of the. Further, a mounting bracket 29 is fixed to the lower surface of the central portion of the plate 18b.
Lock one end of the wire 21.

Then, the spring type bearing 30 is fixed to the upper end portion of the excavator 11, the sheave 22 is pivotally attached to the spring type bearing 30, and the wire 21 is wound. As previously mentioned,
The other end of the wire 21 is wound around a winch 23, and an appropriate tension is applied so that the wire 21 does not relax. At the same time, since the sheave 22 is pivotally supported by the spring type bearing 30, the vertical vibration during excavation is absorbed by the spring type bearing 30 and the vibration is not transmitted to the float through the wire 21. Is formed. Further, since the liquid tank 17 is covered with the upper lid 25, it is possible to prevent the float 18 from being disturbed by wind or the like.

Therefore, the float 18 floats on the liquid 24, and the wire 21 between the fitting 29 and the sheave 22 is held in the vertical state. When the excavator 11 moves horizontally in the vertical hole 15, the float 18 moves horizontally while floating in the liquid 24 in order to hold the wire 21 in the vertical state. At this time, the detection body 26 provided on the float 18 also horizontally moves together with the float 18, and the non-contact displacement gauge 28 detects the displacement amount of the detection body 26 in the X direction and the Y direction, thereby excavating. Measure the horizontal position of the machine 11.

As an example of the non-contact type displacement meter 28,
It is known that a light emitting portion and a light receiving portion for light or laser light are provided so as to face each other, and the X coordinate and the Y coordinate of the detection body 26 existing in the light beam are measured. In addition, as shown in FIG. 5, the head of the detection body 26 provided on the float 18 is fixed to the CCD camera 3
There is also one in which the X-coordinate and the Y-coordinate of the detection body 26 are measured by taking a picture with No. 1 and displaying the image on the monitor TV 32, or by performing image processing and displaying as graphic data.

When the excavator 11 descends during the excavation work, the float 18 begins to sink into the liquid 24 due to the pulling of the wire 21 shown in FIG. 2, and the limit provided at the upper end of the opening 17a. The lower surface of the plate 18b contacts the switch 33. If so, the limit switch 33
When the winch 23 is turned on, the winch 23 starts the lowering operation, the wire 21 is paid out from the winch 23, and the float 18 floats again. Further, when the wire 21 is fed at a higher speed than the descending speed of the excavator 11, the float 18 further floats and the upper surface of the plate 18b comes into contact with the limit switch 34 provided on the lower surface of the installation table 27. . In that case, the lowering operation of the winch 23 is stopped by turning on the limit switch 34.

Although not shown, an auto-tension winch capable of keeping the wire tension constant may be used. Thus, the wire 21 is gradually fed out from the winch 23 as the excavator 11 excavates, and an appropriate tension is applied so that the wire 21 is not tensioned or loosened. For this reason, the float 18 maintains a state in which the float 24 is submerged in the liquid 24 by a substantially constant portion, and the displacement of the detection body 26 by the non-contact type displacement meter 28 can always be accurately measured.

Although the tension of the wire 21 varies slightly depending on the floating / sinking state of the float 18, as shown in FIG. 6, by keeping the floating body 18a submerged in the liquid 24, the buoyancy changes. It is also possible to reduce the fluctuation of the tension of the wire 21 by reducing 7 to 10 show an embodiment in which the numbers and shapes of floats and liquid tanks are different, and FIGS. 7 and 8 show four liquid tanks 35a, 35b, 35.
floats 36a, 36b, 36c, 3 on c and 35d, respectively.
It shows a configuration in which 6d is floated. The floats 36a to 36d are connected by a cross-shaped frame 37. The detection body 26 is provided on the upper surface of the central portion of the frame 37, and a mounting member 29 is fixed to the lower surface of the central portion of the frame 37 to attach one end of the wire 21. Lock. Even in such a configuration, when the excavator 11 moves in the horizontal direction,
The floats 36a to 36d connected by the frame 37 to make the wire 21 vertical are connected to the liquid tanks 35a to 35d.
The position of the excavator 11 can be detected by horizontally moving inside and measuring the displacement of the detection body 26 at this time.

9 and 10 show a configuration in which a circular float 39 is floated in one liquid tank 38, a cross-shaped frame 40 is fixed to the upper surface of the float 39, and a detector is provided on the upper surface of the central portion thereof. 26 is provided. The frame 40 includes a cross-shaped upper frame 40a and leg frames 40b, 40b, 4 vertically installed at four end portions of the upper frame 40a.
0b, 40b and each leg frame 40b, 40b, 40
Cross-shaped lower frame 4 connecting the lower ends of b and 40b
0c, and is formed so that the float 39 can move horizontally and vertically while floating in the liquid tank 38. Even in such a configuration, when the excavator 11 moves in the horizontal direction, the float 39 fixed to the frame 40 to move the wire 21 vertically moves horizontally in the liquid tank 38, and the detection body at this time is detected. The position of the excavator 11 can be detected by measuring the displacement of 26.

The present invention can be modified in various ways without departing from the spirit of the present invention, and it goes without saying that the present invention extends to such modifications.

[0020]

As described in detail in the above one embodiment, the present invention is provided with a position detecting device above the vertical hole, so that it is not affected by vibrations during excavation work, etc. Even if there is, the position of the excavator can always be detected.
In the position detecting device, the float is floated inside the liquid tank, and the wire is wound around the sheave pivotally attached to the upper end of the excavator and locked to the float. By detecting, the horizontal position of the excavator can be measured.

Further, as the wire is fed out from the winch as the excavator moves forward and the float is kept floating inside the liquid tank, the tension of the wire becomes substantially constant and the linearity of the wire is reduced. Retained. Therefore, it is possible to measure the horizontal excursion of the excavator extremely accurately without any disturbance such as impact being applied to the float.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view showing the overall configuration of a pit excavator and a position detection device.

FIG. 2 is an enlarged view of a main part of the position detection device.

3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is an explanatory view showing another embodiment of the non-contact type displacement meter.

FIG. 6 is a vertical sectional front view showing a modified example of the float.

FIG. 7 is a plan view of a main part showing another embodiment of the float and the liquid tank.

8 is a cross-sectional view taken along the line CC of FIG.

FIG. 9 is a plan view of a main part showing another embodiment of the float and the liquid tank.

10 is a cross-sectional view taken along the line DD of FIG.

[Explanation of symbols]

 11 excavator 15 vertical hole 16 position detection device 17 liquid tank 18 float 21 wire 22 sheave 23 winch 26 detector 28 non-contact displacement meter 35a-35d liquid tank 36a-36d float 38 liquid tank 39 float

Claims (2)

[Claims] 1. A position detecting device provided on the ground above a vertical hole during excavation, wherein a float is floated inside a liquid tank of the position detecting device, and a detecting body is provided on the float and a horizontal position of the detecting body. A means for detecting the wire, further, one end of the wire is locked to the float, the wire is suspended in the vertical hole and wound around a sheave pivotally attached to the upper end of the excavator, and further, A position detecting device for a pit excavator, characterized in that the other end is wound around a winch installed on the ground. 2. A horizontal direction of the excavator by feeding out a wire from the winch as the excavator advances, maintaining the float in a state of always floating inside the liquid tank, and detecting the horizontal position of the detection body. 2. The position detecting method by the position detecting device for a pit excavator according to claim 1, wherein the position deviation is measured.