JP2001182475A - Axial dislocation measuring method of drilling hole and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely measure shaft center dislocation of a drilling hole without influence by rotating vibration as well as without stopping rotation of an auger screw. SOLUTION: Shaft center dislocation of a drilling hole is measured by detecting a clearance between mating end surfaces by a stroke detector 12 while rotating auger screws 5, 8 by burying the stroke detector 12 in an auger screw 8 on one side on a connecting part to connect the upper and lower auger screws 5, 8 and projecting a detecting element 12b of this stroke detector 12 toward the mating end surface side of the opposed auger screw 5 at the time of drilling by an earth auger drilling machine furnished with the auger screws.

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 an axial deviation of a drilled hole for measuring an axial center deviation of the drilled hole when drilling with an earth auger excavator having an auger screw. .

[0002]

2. Description of the Related Art Conventionally, as a method of forming a retaining wall or a water blocking wall in civil engineering work, soil cement milk is poured into a drilled hole drilled using an earth auger excavator, and the soil cement milk is formed. There is known a soil cement method in which H-shaped steel or the like is injected into the injected portion to reinforce it.

[0003] In the excavation by such an earth auger excavator, drilling is usually performed by intruding an auger screw into the ground along an upright leader. However, drilling is performed deep underground. Therefore, no matter how correctly the auger screw is guided and supported by the leader, the axis of the drilling hole gradually shifts due to the tip of the auger screw hitting boulders or boulders in the ground etc. There was a problem. If such a displacement occurs, the wall body becomes irregular in the process of constructing the continuous wall. Conventionally, as a means for preventing the displacement during the drilling, an inclinometer or an optical device is mounted on the auger screw shaft. 2. Description of the Related Art A measuring instrument such as a sensor is attached to check whether the axis of a drilled hole is displaced.

[0004]

However, in the conventional measuring instrument, the inclination of the auger screw cannot be measured unless the rotation of the auger screw is stopped once, or the auger screw is rotated. However, even when the measurement is performed, there is a problem that the rotational vibration of the auger screw is detected and an accurate measurement value cannot be obtained. Here, if the rotation of the auger screw is temporarily stopped for measurement, the screw blade will bite into the earth and sand, making it difficult to restart.

The present invention has been made in order to solve such a problem, and it is possible to accurately detect the axial center deviation of a drilled hole without stopping rotation of an auger screw and without being affected by rotational vibration. It is an object of the present invention to provide a method and an apparatus for measuring an axial deviation of a drilled hole which can measure well.

[0006]

Means for Solving the Problems and Functions / Effects In order to achieve the above-mentioned object, a method for measuring the axial deviation of a drilled hole according to the first invention is characterized in that when drilling with an earth auger excavator having an auger screw, A stroke detector is buried in the auger screw on one side of the connecting part that connects the auger screws, and the detector of the stroke detector is protruded toward the mating end face side of the opposing auger screw to rotate the auger screw. The gap detector detects the gap between the abutting end faces while measuring the axial center deviation of the drilled hole.

In the first aspect of the present invention, when the drilling axis of the auger screw is displaced due to some resistance during the underground drilling while rotating the auger screw, the upper and lower auger screws are connected. When there is play in the connecting portion, the connecting portion performs a rotating motion (a so-called “sliding motion”) while bending.
Therefore, by detecting the bending state of the upper and lower auger screws in the connecting portion with the stroke detector embedded in the one auger screw, the displacement of the drilling axis can be measured. As described above, according to the measuring method of the present invention, the displacement of the drilling axis is measured using the rotational movement of the auger screw, so that the measurement can be performed without stopping the operation. Also,
Since the gap between the abutting end surfaces of the upper and lower auger screws is detected by the stroke detector, the axial center deviation of the drilled hole can be accurately measured with little influence from the rotational vibration of the auger screw. .

Next, an apparatus for measuring the axial center deviation of a drilled hole according to a second aspect of the present invention relates to an apparatus for specifically realizing the measuring method according to the first aspect of the present invention, and includes an earth auger having an auger screw. In an excavator, a stroke detector is buried in one auger screw of a connecting portion connecting the upper and lower auger screws such that a detector thereof protrudes toward a butt end face side of the opposing auger screw. It is assumed that. In the present invention, the same operation and effect as those of the first invention are provided.

Here, it is preferable that the detector is disposed on an outer peripheral portion of the abutting end face. In the outer peripheral portion of this butt end face, a large gap between the butt end faces of both auger screws will appear when the auger screw is inclined,
It is possible to improve the detection accuracy of the axial center deviation of the drilled hole by the stroke detector.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific embodiment of a method and an apparatus for measuring an axial deviation of a drilled hole according to the present invention will be described with reference to the drawings.

FIG. 1 is a front view of an earth auger excavator according to one embodiment of the present invention.

In the earth auger excavator 1 of the present embodiment, an auger driving device 4 descends along the guide surface of the leader 3 on the front surface of a leader 3 supported by a crawler traveling base machine 2 and arranged upright. Attached to
An auger screw (hereinafter, referred to as an auger screw)
It is called "upper auger screw". ) 5 is rotatably suspended via a lot 6. In addition, reference numeral 7 in the figure denotes a suspension cable that suspends the auger driving device 4.

The upper auger screw 5 is formed as a hollow shaft having an injection passage 5a for cement milk therein.
The output shaft of the auger driving device 4 is connected to a swivel joint (not shown). A measuring auger screw 8 is connected to a tip (lower end) of the upper auger screw 5, and an auger head 9 is attached to the tip (lower end).

FIGS. 2 (a) and 2 (b) show the structure of a connecting portion between the upper auger screw 5 and the measuring auger screw 8. FIG.

The measuring auger screw 8 is formed of a hollow shaft having a cement milk injection passage 8a therein similarly to the upper auger screw 5, and has a hexagonal column-shaped male joint piece 10 at the upper end thereof. ing. On the other hand, at the lower end of the upper auger screw 8 connecting the upper end of the measuring auger screw 8, a female joint piece 11 also in the form of a hexagonal column into which the male joint piece 10 is fitted is provided. ing. Further, on the outer peripheral surface of the male joint piece 10, two pin insertion grooves 10a, 10a each having a semicircular cross section are formed in parallel with each other, and the female joint piece 1 facing the pin insertion grooves 10a, 10a is formed.
Two pin insertion grooves 11a, 11a each having a semicircular cross section, which are also parallel to each other, are formed on the inner peripheral surface of the pin 1. Thus, the male joint piece 10 is fitted into the female joint piece 11, and the matched pin insertion grooves 10a, 11a;
The upper auger screw 8 and the measuring auger screw 8 are connected by inserting a pin (not shown) into the respective 0a and 11a.

At the lower end of the measuring auger screw 8, a female joint piece 11 having the same structure as that of the lower end of the upper auger screw 5 is provided. The male joint piece (not shown) at the upper end of the head 9 is connected similarly.

At a position near the connecting portion connecting the upper auger screw 5 and the measuring auger screw 8, the measuring auger screw 8 (the male joint piece 10
Auger screw on the side where is provided)
A stroke detector 12 is embedded in the outer periphery of the butted end faces of the auger screws 5 and 8. The stroke detector 12 has a structure known per se. When the detector 12b protrudes and retracts with respect to the detector main body 12a, the movement amount of the detector 12b is adjusted by the amplifier board 1.
2c, the electric signal is converted to an electric signal, and the electric signal is transmitted to a controller (not shown) via the connector 12d.
The detection result is displayed on a display (not shown) installed in the cab of the base machine 2. In the stroke detector 12, the detector 12b is constantly urged in a protruding direction by the spring force of a built-in spring (not shown), and the tip of the detector 12b is normally measured by the spring urging force. Auger Screw 8
Is protruded from the end face of the upper auger screw 5 toward the butt end face of the opposing upper auger screw 5 (the state shown in FIG. 3A). When the distal end face of the detector 12b is pressed against the spring force in this state, the detector 12b is immersed in the detector main body 12a, and the amount of movement at that time is determined by the amplifier board 12a.
c.

[0018] With this configuration, during the underground drilling while rotating the auger screws 5, 8 and the auger head 9, the drilling axis is shifted from the reference drilling line. In addition, since there is play at the connecting portion connecting the upper auger screw 5 and the measuring auger screw 8, the connecting portion bends and performs a rotating motion (a so-called "sliding motion"). The detector 12b of the stroke detector 12 is pressed each time the auger screws 5, 8 are rotated by 180 ° due to the oscillating motion, whereby the bent state between the auger screws 5, 8 can be detected. The detection value of the stroke detector 12 is transmitted to the controller, so that the driver in the operator's cab can be notified of the state of displacement of the drilling axis.

According to the earth auger excavator 1 of this embodiment, it is possible to measure the displacement of the drilling axis while rotating the auger screws 5 and 8, so that the operation is stopped as in the prior art. It is not necessary to perform the measurement, and it is possible to avoid the occurrence of such a problem that the screw blade bites into the earth and sand due to the stop of the rotation of the auger screw, making it difficult to restart. In addition, since the gap between the butting end faces of the upper and lower auger screws is detected by using the stroke detector 12, the rotational vibration of the auger screw is accurately detected by detecting the rotational vibration of the auger screw as in the method using a conventional inclinometer. There is no problem that measured values cannot be obtained.

In the present embodiment, the stroke detector 1
The stroke detector 12 has been described as being embedded in the measurement auger screw 8, but the stroke detector 12 may of course be embedded in the upper auger screw 5. Further, in the present embodiment, the measurement auger head 8 is provided on the side close to the auger head 9, and the stroke detector 12 is provided at the connection between the measurement auger screw 8 and the upper auger screw 5. When drilling is performed by connecting a number of auger screws, a stroke detector 12 may be provided at each connecting portion to detect a bent state at each connecting portion. Thus, for example, a state in which the auger screw is bent in a substantially S-shape as a whole can also be detected.

In this embodiment, the case of drilling with an earth auger excavator having one auger screw has been described. However, in the present invention, drilling is performed by arranging a plurality of auger screws in parallel at a predetermined pitch. It can also be applied to the earth auger excavator of the following type. For example, when the present invention is applied to an earth auger excavator in which three auger screws are arranged in parallel and drilled, the stroke detectors are attached to two outer auger screws, respectively. When it is detected that a shift occurs in the drilling axis of the auger screw, a command is issued to one of the braking mechanisms of the auger screw provided for each auger screw. Then, a braking operation is performed, and the braking operation can be used to correct the drilling hole axis line using the rotational force of the shafts of the other two auger screws to return to the normal state.

[Brief description of the drawings]

FIG. 1 is a front view of an earth auger excavator according to one embodiment of the present invention.

FIGS. 2A and 2B are views showing a structure of a connecting portion between an upper auger screw and an auger screw for measurement.

3 (a) is a partially enlarged view of FIG. 2 (a), and FIG.
(B) is a detailed structural diagram of a stroke detector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Earth auger excavator 2 Base machine 3 Leader 4 Auger drive device 5 Upper auger screw 6 Lot 7 Hanging cable 8 Auger screw for measurement 9 Auger head 10 Male joint piece 11 Female joint piece 12 Stroke detector 12b Detector

Claims (2)

[Claims] When a drill is drilled by an earth auger excavator having an auger screw, a stroke detector is embedded in one auger screw of a connecting portion connecting the upper and lower auger screws, and a detector of the stroke detector is used. And projecting toward the butt end face side of the opposing auger screw, and detecting the gap between the butt end faces with the stroke detector while rotating the auger screw to measure the axial center deviation of the drilled hole. A method for measuring an axial deviation of a drilled hole, characterized in that: 2. An earth auger excavator having an auger screw, a detector of which projects into an auger screw on one side of a connecting portion connecting the upper and lower auger screws toward a butt end face of the opposing auger screw. A device for measuring axial deviation of a drilled hole, wherein a stroke detector is embedded as described above.