JP3408231B2 - Drilling hole accuracy correction method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for correcting the accuracy of a borehole.
It is about the law . 2. Description of the Related Art Conventionally, there has been known a multi-axis excavator in which a plurality of excavating shafts 1 for excavating the ground by rotation are juxtaposed.
This multi-axis drilling rig is, for example, 3
The excavation shaft 1 is rotatably connected by a connecting band, and excavates the ground while rotating the three excavation shafts 1. In this case, the adjacent heads 12 of the excavation shafts 1 are vertically displaced from each other, and the rotation trajectories of the adjacent heads 12 in plan view partially overlap each other. The excavation hole excavated by the apparatus is an elongated hole in which three excavation unit holes formed by each excavation shaft 1 are formed and adjacent excavation unit holes partially overlap in plan view. In digging with a plurality of digging shafts as described above, as shown in FIG. 8, a line M connecting the axis of the tip of the plurality of digging shafts 1 during the digging is a plurality of digging at a regular position as a whole. There is a case where it is shifted substantially parallel to the virtual line N connecting the axis of the shaft 1. In FIG. 8, the dashed line is the normal position of the plurality of excavation shafts 1 and the plurality of excavation shafts 1 are displaced parallel to the normal position of the plurality of excavation shafts 1 as indicated by the solid line. However, there is a problem that it is not possible to form an exact hole as designed. Here, as another conventional example, a line connecting the axes of a plurality of excavation shafts during excavation is substantially parallel to an imaginary line connecting the axes of a plurality of excavation shafts at regular positions as a whole. Utility model registration No. 30
No. 63517 is known. In this conventional example, a braking mechanism (brake mechanism) is provided in a supporting device that supports the tip portions of a plurality of excavating shafts, and a plurality of excavating shafts are returned to their normal positions by applying a brake to the excavating shafts. ing. However, in this conventional example, since a brake is applied in the vicinity of the tip of the excavation shaft, a brake device is required at a portion to be inserted into the ground, and the brake device becomes an obstacle from the viewpoint of excavation, and In addition, there is a problem that it is not realistic, and furthermore, since the brake is applied to the lower end of the excavation shaft, the excavation shaft may be twisted and damaged, and the rotation direction of the remaining excavation shaft may also be one. Since it is not the direction, there is a problem that it is not possible to smoothly twist the entire excavation axis to a regular position. SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has three or four drilling holes during excavation.
Even if the line connecting the axes of the five excavation shaft tips is displaced almost parallel to the imaginary line connecting the axes of three, four or five excavation shafts at the correct position as a whole, it can be easily corrected. Hole accuracy correction method that can form the intended hole
The task is to do so. [0006] In order to solve the above-mentioned problems, a method for correcting the accuracy of a drilling hole according to the present invention is based on three or four or five drilling shafts 1 arranged side by side in a horizontal direction. When excavating the ground 2 by rotating the adjacent excavation shafts 1 in directions opposite to each other, three or four or
The line M connecting the axes of the five excavation shafts 1 is shifted substantially parallel to the imaginary line N connecting the axes of the three, four or five excavation shafts 1 at the regular positions as a whole. In this case, among the three, four, or five excavating shafts 1 arranged side by side in a shifted position, the entire excavating shaft 1 is rotated about the excavating shaft 1a at one end. 3 or 4 or 5 excavation axes 1
Three drilling shaft 1b of the other side end at the normal position of the
Alternatively, a first correction is made to be located on an imaginary line N connecting the axes of the four or five excavating shafts 1. In the first correction, the excavating shaft 1a at one end is decelerated or stopped. And the first excavation shaft 1a at one end is used as a first pivot center and the excavation shaft 1 at the other end is used as a first pivot center.
b is 3 or 4 or present to face the five imaginary lines N side connecting the axis of the drilling shaft 1 of 3 or 4 in the normal position
Alternatively , the other excavation shafts 1 other than the excavation shaft 1 serving as the first rotation center are rotated in a direction in which the entire five excavation shafts 1 rotate, and the first
After the correction of the above, the entire excavation shaft 1 is rotated around the excavation shaft 1 located at the other side end in a direction opposite to the rotation of the entire excavation shaft 1 in the first correction, and three or four excavation shafts are rotated. The line M connecting the axes of the five or five excavating shafts 1 to three or
A second correction is made to match the imaginary line N connecting the axes of the four or five excavating shafts 1. In the second correction, the excavating shaft 1b at the other end is decelerated or stopped and then excavated. 1, the excavation shaft 1b at the other end is used as the second pivot center and the excavation shaft 1a at one end is set at three, four, or five at a regular position. Except for the excavation shaft 1b which is the second rotation center in the direction in which the entirety of the three, four or five excavation shafts 1 turn toward the virtual line N connecting the axes of the excavation shafts 1 The other excavating shaft 1 is rotated. By adopting such a method, three or four or five lines M connecting the axis of the extremity of the excavation shaft 1 during excavation are generally three or four lines at regular positions.
Alternatively, even if the excavation shaft 1 is displaced substantially parallel to the imaginary line N connecting the axes of the five excavation shafts 1, the first correction and the second correction of changing the rotation speed and the rotation direction of the excavation shaft 1 By correcting the stage, it is possible to return to the normal position. [0008] The present invention will be described below based on an embodiment shown in the accompanying drawings. FIGS. 1 to 3 show a multi-shaft excavator A with an excavation hole accuracy correcting device according to the present invention. The multi-axis excavator A has the following configuration. That is, a leader 6 is provided on a vehicle body 5, and a moving body 7 is mounted movably in a vertical direction along a rail 6a provided on the reader 6, and the moving body 7 is suspended by a wire 8. The moving body 7 moves up and down along the reader 6 by winding and rewinding the winding device 9. The moving body 7 is provided with a plurality of (three in the embodiment shown in the accompanying drawings) rotating devices 10, and the upper end of the excavation shaft 1 is attached to each rotating device 10, respectively.
Each excavating shaft 1 is independently rotated by each rotating device 10, and by changing the rotating direction of each rotating device 10, the rotating direction of each excavating shaft 1 can be independently changed in the opposite direction. The rotation speed of the excavating shaft 1 can be independently changed by changing the rotation speed of the rotating device 10. Here, a plurality of excavating shafts 1 arranged side by side in a horizontal direction during normal excavation are set so that adjacent ones rotate in opposite directions.
In this way, by setting the rotation directions of the adjacent excavation shafts 1 to be opposite to each other, a plurality of excavation shafts 1 are used to perform excavation, and a plurality of connection bands 11 are connected as much as possible in a horizontal row. Is not likely to be twisted left or right in plan view as a whole. Also, in the case of mixing and mixing a consolidation liquid such as cement milk and excavated earth and sand during excavation as described below,
By setting the rotation direction of the adjacent excavating shaft 1 to the opposite direction, the stirring and mixing can be effectively performed. The plurality of excavating shafts 1 are arranged side by side so as to be aligned in a horizontal direction, and the plurality of excavating shafts 1 are rotatably connected by a connecting band 11. The distance between the excavating shafts 1 is kept constant. A head 1 is located at the tip (lower end) of each excavation shaft 1.
2 are provided so that the adjacent heads 12 of the excavation shafts 1 are vertically displaced from each other, and the rotation trajectories of the adjacent heads 12 in plan view partially overlap. Therefore, the drilling holes 4 drilled by the plurality of drilling shafts 1 of the multi-axial drilling apparatus A are formed with a plurality of drilling unit holes 4a formed by the respective drilling shafts 1 and adjacent drilling unit holes 4a are viewed from above. It becomes a skewer dumpling-like elongated hole partially overlapping. The excavation shaft 1 is provided with a side protruding portion 13, which is formed by a spiral member or a wing member. Also, head 1
An injection hole (not shown) for injecting a consolidation liquid such as cement milk is provided at an arbitrary position in the vertical direction of the excavation shaft 2 or the excavation shaft 1. Further, the reader 6 is located below the reader 6.
Is provided with a plurality of excavating shafts 1 which are movable in the up and down direction and in which the plurality of juxtaposed shafts 1 are juxtaposed so as to be movable in the up and down direction. The excavating shaft 1 is prevented from swinging on the ground. The excavating shaft 1 is provided with an inclinometer 23. In the embodiment shown in FIG.
Is provided with an inclinometer 23. The inclinometer 23 is for measuring in which direction and how much the excavating shaft 1 is inclined in the ground 2, and a conventionally known inclinometer 23 can be used. Hereinafter, an example of the inclinometer 23 will be described. An inclinometer 23 is provided near the lower end of the excavating shaft 1, and the inclinometer 23 is provided with a metal pendulum 25 in a probe cylinder 24 as shown in FIG. The probe 26 is moved to the center axis W of the probe cylinder 24 by the electric spring 26. The electric spring 26 is configured by providing a coil 27 on a metal pendulum 25 and inserting a magnet 28 protruding from the inner surface of the probe cylinder 24 into the coil 27, as shown in FIG. 6A. When the voltage is perpendicular to the center, the balance is maintained by an electric spring 26, and the voltage for moving the metal pendulum 25 to the center of the probe cylinder 24 is 0 V. The state in which the voltage of 0 V is applied is regarded as vertical. ing. On the other hand, when the probe cylinder 24 is tilted as shown in FIG. 6B, the inside of the probe cylinder 24 loses balance with the electric spring 26, and a coil is required to move the metal pendulum 25 to the center axis W of the probe cylinder 24. 27
It is necessary to return current to an equilibrium state by flowing current through the magnetic force. The voltage required at this time is fed back from the detector 29 provided in the probe cylinder 24, and the inclination angle α is obtained from the magnitude of the voltage. That is,
The inclination angle α is calculated based on the theory that the greater the inclination of the probe cylinder 24, the greater the voltage required to return the metal pendulum 25 inside to the center axis W of the probe cylinder 24. ing. In addition, 19 in FIG.
Indicates an amplifier. Two probe cylinders 24 are mounted on the excavating shaft 1, and a metal pendulum 25 in one probe cylinder 24 measures an inclination angle in the X direction (left-right direction), and the other probe The metal pendulum 25 in the cylinder 24 measures the inclination angle in the Y direction (front-back direction). The measurement of the inclination angle of the tip of the excavation shaft 1 by the inclinometer 23 having the above configuration is performed at every predetermined pitch depth (that is, each time the tip of the excavation shaft 1 reaches the predetermined pitch depth).
The rotation of the excavation shaft 1 is stopped and the measurement is performed.
The deviation from the vertical axis is obtained by multiplying the depth pitch by the inclination angle for each section as shown in FIG. That is, when θ is small, tan θ ≒ θ, and xi = Li × tan θi
≒ Li × θ. And the total depth L = ΣLi =
L ₁ + L ₂ + L ₃ , and the total deviation = Σx ₁ = x1 + x
2 + x3, that is, the deviation in the X direction (lateral direction) at a certain depth L of the excavation axis 1 can be obtained as x1 + x2 + x3. Similarly, the deviation at a certain depth in the Y direction can be obtained. In this way, by measuring the inclination in the X and Y directions at the tip of the excavating shaft 1 located at both ends, the actual deviation of the tip of the excavating shaft 1 can be known. It has become. Of course, the inclinometer 23 is not limited to the above-described one, and any device capable of measuring the inclination of the excavation shaft 1b and measuring the deviation of the excavation shaft 1 from the vertical axis can be used. Another inclinometer 23 may be used. Thus, the ground 2 is excavated by using the multi-axial excavator A having the above configuration. In excavation, the ground 2 is excavated while rotating a plurality of excavation shafts 1 arranged side by side in a horizontal direction. In this case, the adjacent heads 12 of the excavation shafts 1 are vertically displaced from each other, and the rotation trajectories of the adjacent heads 12 in plan view partially overlap each other. As shown in FIG. 4, a plurality of excavation holes 4 excavated by the plurality of excavation shafts 1 of the apparatus A are formed by a plurality of excavation unit holes 4a formed by the respective excavation shafts 1 and adjacent to the excavation unit holes 4a.
a become a skewered dumpling-like elongated hole partially overlapping each other in plan view. In the above excavation, the soil cement is filled in the excavation hole 4 by stirring and mixing the excavated earth and sand and the consolidation liquid while injecting a consolidation liquid such as cement milk from an injection hole provided in the excavation shaft 1. Ta Soil Cement Column 30
Is formed. Then, when the above-described excavation hole 4 is formed, the side end of the excavation hole 4 previously formed and the side end of the excavation hole 4 to be formed next overlap (that is, the excavation unit of the side end portion). Excavation (so that the holes 4a overlap each other) allows the skewer dumpling-shaped excavation holes 4 filled with soil cement to be continuous, thereby forming a continuous underground wall. By the way, the excavation hole 4 filled with soil cement is formed in the ground 2 by the multi-axial excavator A as described above. The line M connecting the cores may be displaced substantially in parallel with the virtual line N connecting the axes of the plurality of excavating shafts 1 at a regular position as a whole. If the excavation is continued while being deviated from the regular position in this manner, the excavated hole 4 cannot be formed as designed. Therefore, in the present invention, during the excavation, a line M connecting the axes of the plurality of excavating shafts 1 is changed to an imaginary line N connecting the axes of the plurality of excavating shafts 1 at regular positions as a whole. When the excavation shafts 1 are displaced substantially parallel to each other, the excavation shafts 1 are turned around the excavation shaft 1a at one end of the plurality of excavation shafts 1 arranged side by side at the displaced positions, and the plurality of excavation shafts 1 are rotated. Of the excavation axis 1 of the other excavation axis 1 is positioned on a virtual line N connecting the axis of the plurality of excavation axes 1 at the normal position, and the entire excavation axis 1 is A line M connecting the axis of the plurality of excavating shafts 1 by rotating the excavating shaft 1 at the side end in a direction opposite to the rotation of the entire excavating shaft 1 in the first correction is a regular position. Of the plurality of excavation shafts 1 by making a second correction to match the virtual line N connecting the axes of the plurality of excavation shafts 1 in The in which returned to the normal position. The first correction and the second correction are performed as follows. That is, as shown in FIG. 5 (a), a line M connecting the axes of the plurality of excavating shafts 1 is substantially parallel to an imaginary line N connecting the axes of the plurality of excavating shafts 1 at a regular position as a whole. When it shifts, as shown in FIG. 5 (b), the excavating shaft 1a at one end is decelerated or stopped to be the first rotation center of the entire excavating shaft 1 and the excavating shaft 1a at the one end is set to the first rotation center. A direction in which the whole of the plurality of excavation shafts 1 is rotated so that the excavation shaft 1b at the other end is directed to the virtual line N connecting the axis of the plurality of excavation shafts 1 at the regular position as a first rotation center. Then, the other excavating shaft 1 other than the excavating shaft 1a serving as the first rotation center is rotated (that is, as shown in FIG. ), The whole of the plurality of excavating shafts 1 is rotated in the direction of arrow B around the excavating shaft 1a), and the excavation at the other end is performed. Axis 1b and is positioned on the virtual line N connecting the plurality of the axis of the drilling shaft 1 in the normal position. This is the first modification. When this first correction is completed, the excavation shaft 1b at the other end is then decelerated or stopped to be used as the second rotation center of the entire excavation shaft 1 and the excavation shaft 1b at the other end is used. A direction in which the whole of the plurality of excavation shafts 1 is rotated so that the excavation shaft 1a at one end is directed to the imaginary line N connecting the axes of the plurality of excavation shafts 1 at the regular positions as a second rotation center. Next, the other excavating shaft 1 other than the excavating shaft 1b serving as the second center of rotation is rotated (that is, as shown in FIG. ), The whole of the plurality of excavating shafts 1 is rotated in the direction of arrow D around the excavating shaft 1b), and the excavating shaft 1a at one end is arranged in a plurality of excavating shafts at regular positions. It is located on the virtual line N connecting the first axis (this is the second correction). By performing the first and second corrections described above, the tip portions of the plurality of excavating shafts 1 are returned to their normal positions. This can be performed by simple control of reducing the rotation speed of a certain excavation shaft 1 and changing the rotation direction of the certain excavation shaft 1. 5 (a), the excavation shaft 1b at the other end of FIG.
5 (c), the excavation shaft 1a at one end is located on the imaginary line N connecting the axes of the plurality of excavation shafts 1 at the normal positions in FIG. 5 (c). The state or the like can be measured by the inclinometer 23 described above. In the above embodiment, an example has been described in which a soil cement column or the like is formed by injecting a consolidation liquid from the injection hole of the excavating shaft 1 and mixing the excavated earth with agitating and mixing. The drilling hole may be formed by using a plurality of drilling shafts 1. In other words, the shape of the drilling hole is not particularly limited as long as the drilling hole is formed by a plurality of drilling shafts 1. Further, although the three-axis embodiment has been described as the excavation axis 1, four, five,... May be used. As described above, according to the first aspect of the present invention, three, four, or five lines connecting the axes of the excavation shaft tips during the excavation are entirely formed. In the case where the digging axis is shifted substantially parallel to the imaginary line connecting the axes of the three, four or five digging axes at the regular position, the digging axis at one end is decelerated or stopped to stop the entire digging axis. An axis of three, four, or five excavation axes at a normal position where the excavation axis at the one side end is the first rotation center and the excavation axis at the one side end is the first center of rotation. Three or four heading toward the imaginary line connecting the cores
Performing a first modification of the whole of the or five drilling shaft rotates the other drilling axis other than the drilling axis to be the first rotational center in the direction of rotation, then the other side end portion 3 drilling axis of the one end of the drilling axis of the other end portion as a second rotation center at a normal position with the drilling shaft reduction or stop and a second center of rotation of the whole drilling shaft Three or four or four or five or so as to go to the imaginary line connecting the axes of the four or four or five excavation axes
Performs a second correction in which other excavation axes other than the excavation axis serving as the second rotation center are rotated in a direction in which all of the five excavation axes are rotated. Three or four lines connecting the axis of the tip at the regular position as a whole
Or , when it is displaced almost in parallel to the virtual line connecting the axes of the five excavation axes, simply control the number of rotations of three, four, or five excavation axes and control the direction of rotation. The first and second modifications can be made, in a simple way, three or four
Alternatively, since the tips of the five excavation shafts can be returned to their normal positions, and the brakes are not applied as in the prior art, the brake device is inserted into the ground and located near the tip of the excavation shaft. It is not necessary to provide a hole, which does not hinder the excavation, and does not cause twisting of the excavation shaft due to application of a brake. [0025]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an embodiment of the present invention. FIG. 2 is an enlarged front view of the same. FIG. 3 is a side view of the same. FIG. 4 is a horizontal sectional view showing a borehole drilled by the above. FIG. 5 (a) shows a case where a line connecting the axes of a plurality of excavation shaft tips at the same time is displaced substantially in parallel with an imaginary line connecting the axes of the plurality of excavation shafts at a regular position as a whole. It is an explanatory view showing, (b) is an explanatory view of the first modification,
(C) is an explanatory view of the second correction. 6A and 6B show the inclinometer used in the embodiment, FIG. 6A is an explanatory diagram showing a case where the inclinometer is vertical, and FIG. 6B is an explanatory diagram showing a case where the inclinometer is tilted. FIG. 7 is an explanatory diagram showing a relationship between total depth and total deviation according to the first embodiment. FIG. 8 is an explanatory diagram showing a case where a line connecting the axes of a plurality of excavation shaft tips is shifted substantially in parallel with an imaginary line connecting the axes of the plurality of excavation shafts at regular positions as a whole. [Description of Signs] 1 Drilling shaft 2 Ground 4 Drilling hole

Continuation of front page (72) Inventor Eiichi 1-13-13 Awaza, Nishi-ku, Osaka-shi, Nariyuki Industry Co., Ltd. 72) Inventor Katsumi Shibahara 1-13-13 Awaza, Nishi-ku, Osaka-shi Nariyuki Kogyo Co., Ltd. Literature JUN 61-3952 (JP, Y2) Utility model registration 3063517 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02F 5/02 E02D 5/18-5/20

Claims (1)

(57) [Claims] [Claim 1] Three or four wires arranged side by side in a horizontal direction
When excavating the ground by rotating five excavation axes so that adjacent excavation axes rotate in opposite directions, three, four, or five excavation shaft cores during excavation The connecting lines are three or four at the regular position as a whole or
When the five excavation shafts are displaced substantially parallel to the imaginary line connecting the axes of the five excavation shafts, the three or
Of the four or five excavation axes, the entire excavation axis is rotated around the excavation axis at one end, and the excavation axis at the other end of three, four, or five excavation axes Is three in the regular position
Or, a first correction is made to be located on an imaginary line connecting the axes of the four or five excavation axes, and in this first modification, the excavation axis at one end is decelerated or stopped to reduce the entire excavation axis. And the excavation axis at the one side end is the first rotation center and the excavation axis at the other end is three, four, or five excavation axes at regular positions. The other excavation axis other than the excavation axis serving as the first rotation center is rotated in the direction in which all of the three, four, or five excavation axes rotate toward the imaginary line connecting the axes. After performing the first correction, the entire excavation axis is turned around the excavation axis located at the other side end in a direction opposite to the rotation of the entire excavation axis in the first correction, and three or
A second correction is performed to match the line connecting the axes of the four or five excavation axes with the imaginary line connecting the axes of the three or four or five excavation axes at the regular position. In the correction of the above, the excavation axis at the other side end is decelerated or stopped to serve as a second center of rotation of the entire excavation axis, and the excavation axis at the other side end is used as a second center of rotation and the one side end Of the three, four, or five excavation axes in the direction in which the three, four, or five excavation axes are turned toward the imaginary line connecting the axes of the three, four, or five excavation axes at the regular positions. A drilling hole accuracy correction method, characterized in that a drilling axis other than the drilling axis serving as a second rotation center is rotated.