JP3032133B2 - Multi-axis drilling machine with hole bending correction function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-axis drilling machine used for forming a continuous underground wall, etc., and more particularly to a multi-axis drilling machine having a hole bending correcting function.

[0002]

2. Description of the Related Art As shown in FIG. 1, a multi-axis drilling machine has a plurality of, for example, three drilling shafts 1, 2, 3 arranged in parallel and in a predetermined axial row, for example, in a cross section. They are arranged in series. These drilling shafts 1, 2, 3 have holding means 4, 5 for holding at the upper and lower parts, respectively.
A digging mechanism X having a rotation drive means 6 for rotating the rollers 2 and 3 around their axes is moved forward and backward along a holding mechanism Y (see FIG. 5) fixed to the ground, for example, a reader 8 of a base machine 7 (in the illustrated example). (Moving up and down) and drilling by the drilling shafts 1, 2 and 3 in the descending process. This multi-axis drilling machine is used for forming a continuous underground wall or a retaining wall.

[0003] However, in this type of multi-axis drilling machine, in many cases, despite the fact that a hole is bent, there is no means for correcting it. For example, the outline of hole bending when a three-axis drilling machine is used will be described with reference to FIGS. 2 and 3. Assume that the rotation direction of each of the drilling shafts 1, 2, and 3 is the direction of the arrow in FIG.

Generally, at the time of drilling, each of the drilling shafts 1, 2, 3
As a result, as shown in FIG. 2, after first excavating the area (1), then skipping one span and excavating the area (2),
Finally, the area (3) between them is excavated using the holes at the ends of the previous areas (1) and (2) as a guide. The reason for using this guide is to prevent bending of the hole as much as possible.

[0005] In a normal state where there is no hole bending, as shown in FIG. 2, each of the drilling shafts 1, 2, 3 always follows the target wall center plane (excavation center line) L.

However, if the ground is hard or soft at each of the drilling shafts 1, 2, and 3 at the depth position where the drilling is being performed, FIG.
As shown in the figure, the drilling axis line C
Excavation may be performed with the slope. As the excavation proceeds as it is, the tendency of the hole to bend becomes greater, and the excavation center line L is greatly deviated, so that the desired excavation accuracy cannot be obtained, and thus the accuracy of the wall to be formed also decreases. . Also, at the stage of excavating the region (3), the above-described drilled holes H ₁ and H ₂ may not be used as the above-mentioned guide, and if there is a difference in hardness between the two surfaces of the wall, as shown by the arrow. In some cases, the bending of the hole becomes steeper.

[0007] The above-mentioned bending direction is often based on the characteristics of the multi-axis drilling machine itself, in addition to the hardness as the resistance of the ground, and the bending direction must be uniformly predicted even for the same model. It is difficult.

Japanese Patent Application Laid-Open No. 5-71122 discloses a method for detecting hole bending in a multi-axis drilling machine. However, the publication discloses any means for correcting the hole bending. Not.

[0009] Also, relatively many proposals have been made regarding the correction of hole bending itself. However, many are corrections for hole bending in a single rod. This is typically disclosed in Japanese Patent Publication No. 2-33830. When a hole is bent, a direction correcting guide is inserted outside the drilling shaft and the inner surface of the direction correcting guide is inserted. In this case, only the drilling shaft is advanced while the drilling shaft is directed in the opposite direction using the tapered portion provided in the above.

[0010]

However, even if this kind of material is applied to a multi-axis drilling machine to which the present invention is applied, it is necessary to provide a direction correcting guide, for example, from the structure of the multi-axis drilling machine itself. It is virtually impossible to insert it outside the drilling shaft again.

Therefore, as for a multi-axis drilling machine, the one disclosed in Japanese Patent Publication No. 58-9209 has been proposed. That is, hole bending is corrected by forcibly bending the support cylinder (mast) with a jack.

However, in this case, each of the drilling shafts only bends along the bending direction surface together with the support cylinder, and the present invention aims to correct the center of the surface, that is, the shaft row surface itself with the center of the shaft row center as the center. Can not do it.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a multi-axis drilling machine which can easily correct the axial line surface itself around the axial line center and which is structurally simple. is there.

[0014]

SUMMARY OF THE INVENTION The object of the present invention is to provide a multi-axis drilling machine having a hole bending correcting function according to the present invention, wherein a plurality of drilling axes are parallel and have a predetermined shaft row on a cross section. Having holding means for holding at upper and lower portions,
In a multi-axis drilling machine in which a digging mechanism having a rotation drive means for rotating each drilling axis around its axis moves forward and backward along a holding mechanism fixed to the ground, and drills by the drilling axis in a forward process. A sliding member is provided between the drilling shaft at the end of the shaft row and at least the lower holding means, and the sliding member is configured to hold the drilling shaft with an inclined surface inclined with respect to the axis of the drilling shaft. The drilling shaft is rotatably held in a sliding member, and furthermore, the at least the endmost drilling shaft and the lower holding means are relatively aligned with each other. This problem can be solved by having a sliding means for moving the sliding member in the axial direction by relative sliding by the sliding means.

Here, jack means is provided between the end of the at least endmost drilling shaft and the upper holding means for moving the drilling shaft at the extreme end back and forth with the upper holding means as a seat. Thus, the sliding means can be configured.

As the jack means, a jack body having one of the cylinder side and the piston side fixed to the upper holding means is provided, and the other is rotatably supported on a drilling shaft around the axis. A structure can be provided in which the bearing is interposed so as to be immovable in the front-rear direction with respect to the outer surface of the drilling shaft.

[0017]

In the multi-axis drilling machine of the present invention, as shown in FIG. 4, a plurality of, for example, three drilling shafts 1, 2, 3 are arranged in parallel and in a predetermined cross-section on a cross section, for example, for example. They are arranged in series. These drilling shafts 1, 2 and 3 have holding means 4 and 5 for holding the drilling shafts at upper and lower portions, and are rotationally driven by a hydraulic motor or the like for rotating the drilling shafts 1, 2 and 3 around their axis. The excavating mechanism X having the means 6 is shown in FIG.
As shown in the figure, the ground-fixed holding mechanism Y, for example, moves forward and backward along the leader 8 of the mast 9 of the base machine 7, and moves up and down in the illustrated example, and drills by the drilling shafts 1, 2, and 3 in the descending process. .

In this multi-axis drilling machine, it is important that the drilling center line L is along the drilling axis line C, and the position of the drilling mechanism X itself is a predetermined position. 1,2,
It is important to change only position 3. In particular, it is necessary to fix the position of the center drilling shaft 1 of the drilling shafts 1, 2, 3 and correct the position of only the drilling shafts 2, 3 at both ends.

Therefore, means for changing the position of the excavating mechanism X itself with respect to the holding mechanism Y cannot be employed. As a result, means for correcting the hole bending in the system of the excavating mechanism X is required.

According to the present invention, in the case of three shafts at the extreme end of the shaft train, the sliding shaft is preferably located between the drilling shafts 2 and 3 preferably located at both ends and the holding means 5 at least at the lower part. Members 12, 13
The sliding members 12 and 13 are fitted inside the holding means 5 with an inclined surface inclined with respect to the axis, and the drill shafts 2 and 3 are rotatable in the sliding members 12 and 13. , And slide means 22, 23 for relatively moving the drilling shafts 2, 3 and the holding means 5 in the axial direction.
Further, the sliding members 12, 13 are moved in the axial direction by the relative sliding by the sliding means 22, 23.

Therefore, as shown in FIG. 7, typically, when the sliding member 13 is moved in the axial direction, for example, lowered, the drilling shaft 3 moves to the right. Then move up to the left when you raise it. Therefore, such an operation is performed on the drilling shaft 3 and
By performing the operation in the opposite direction with respect to the drilling shaft 2, the drilling shaft row line C can be aligned with the target excavation center row line L, as will be described later in detail.

[0022]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 4 to 9 show an example of a three-axis drilling machine according to the present invention.
2, 3 are arranged in parallel and on a cross section with a predetermined shaft row, for example in series. Drilling bits 1A, 2A, 3A and stirring blades 1B, 2B, 3B are integrally provided at the tips of the drilling shafts 1, 2, 3 and on the base side thereof.

These drilling shafts 1, 2, 3 are connected to the upper holding means 4 at the upper part and to the lower holding means 5 at the lower part.
Is held by Each of the drill shafts 1, 2, 3 is rotated around its axis by a rotary drive means 6, such as a hydraulic motor. The upper holding means 4 has a casing and a rotation mechanism. In this rotating mechanism, for example, a driven gear meshed with a driving gear connected to an output shaft of a hydraulic motor, the other two driven gears mesh with the driven gear, and each of the three driven gears has a drilling shaft 1. , 2, 3 are integrated, whereby each of the drilling shafts 1, 2, 3 rotates in the direction of the arrow in FIG. 4, for example.

On the other hand, as shown in FIG. 5, this excavating mechanism X is a holding mechanism Y fixed to the ground, for example, a base machine 7.
Is suspended by a leader 8 of a mast 9 via wires, moves up and down along the leader 8, and drills holes by drilling shafts 1, 2, and 3 in a descending process.

Since such a device is known, it will not be described in detail.

On the other hand, in the present invention, the sliding members 12, 3 are provided between the drilling shafts 2, 3 and the lower holding means 5 for holding them.
The sliding members 12 and 13 are fitted inside the lower holding means 5 with an outer surface inclined with respect to the axis. Specifically, the sliding members 12 and 13 have inclined surfaces 12T and 13T with respect to the upright surface connecting the drilling shafts 1, 2 and 3, respectively.
(The inclined surface 12T is not shown) is formed on the inner surface of the main body 5A of the lower holding means 5.
An inclined surface 5T corresponding to 3T is formed. Locking means such as a key 30 is provided on these fitting surfaces so that the sliding members 12 and 13 do not rotate together.

Further, in order to raise and lower the sliding members 12, 13, the operating flanges 31, 31,... .

The drilling shafts 2 and 3 are provided with sliding members 12 and 13.
Are fitted with some play inside and are rotatably held.

Further, sliding means 22 and 23 comprising hydraulic jacks and the like for relatively moving the drilling shafts 2 and 3 and the lower holding means 5 in the axial direction are provided with the upper holding means 4 and the drilling shafts 2 and 3. The base is interposed.

FIG. 9 shows an example of the specific drilling shaft 2 only. That is, the hydraulic cylinders 22A, 22A
A are fixed to the upper fixing means 4 in parallel with the drilling shaft 2, and an engaging portion 22 B is fixed to the drilling shaft 2. An engaging body 22C is integrated with the rod ends of the hydraulic cylinders 22A, 22A,..., And the engaging body 22C is engaged with the engaging portion 22B via bearings 22D, 22E.

Therefore, the hydraulic cylinders 22A, 22
The drilling shaft 2 moves up and down by the expansion and contraction of the rod A. Further, since the bearings 22D and 22E are interposed, the drilling shaft 2 itself can be rotated by the above-mentioned rotation driving means 6 irrespective of the expansion and contraction of the rod of the hydraulic cylinder 22A. In addition, as shown in FIG. 9, a projection 24A is integrated with the lower end of the rotary drive shaft 24 to impart rotation to the drilling shaft 2 that moves up and down, and this projection 24A is attached to the inner surface of the drilling shaft 2. It is interposed between the integrated guide members 25, 25.

In the apparatus configured as described above, for example, as shown in FIG. 6, while the drilling axis line C is inclined clockwise with respect to the target excavation center line L, the hole bending occurs. In some cases, as shown in FIG. 6, the slide means 22 is pulled up and the slide means 23 is pushed down. As a result, in the upper drawing of FIG.
From the state of the solid line, the sliding member 12 moves in the direction shown by the lower virtual line, and on the contrary, the sliding member 13 moves in the direction shown by the upper virtual line. Therefore, since the drilling shafts 2 and 3 move together, the bending of the hole is corrected. In the case where a hole bending in which the drilling shaft row line C is inclined in the counterclockwise rotation direction is occurring,
Perform the reverse operation to correct the bend. This mode of movement of the drilling shaft is clearly shown in FIG. In FIG. 7, the black arrow indicates the vertical direction, and the white arrow indicates the moving direction of the drill shaft 3.

As shown in FIG. 4, for example, as shown in FIG. 4, the inclinometers 40A and 40B are attached to both or one of the drilling shafts 2 and 3, and the inclination angle .theta. Or the amount), and the detection signal is sent to the slide means 2
It can be used for a feedback signal of 2, 23 lifting operation.

The above-described example is for the case of three axes, but it is possible to correct the hole bending with a similar structure in the case of two axes or four or more axes. In the case of four or more axes, the hole bending correcting means is preferably provided on at least the both end drilling shafts, and is suitably provided on at least the both end drilling shafts.

On the other hand, in the above-described example, the drilling shaft is moved. As shown in FIG. 10, the lower holding means 5 can be moved up and down by an elevating cylinder 50 fixed to the mast 9, and the lower holding means 5 For example, it can be moved up and down along the leader 8, and in this case also, the same operation is performed (however, the direction of movement of the drilling axis is reversed with respect to the up / down operation).

Further, the holding means is provided in two stages, upper and lower,
In the case where the hole bending correction device is provided in the middle, the above-described hole bending correction device can also be provided in the holding means at the middle stage. In this case, the correction movement amount of the intermediate hole bending correction device and the lower hole bending correction device can be controlled according to the target hole bending correction amount.

In the above example, since the outer surfaces of the sliding members 12 and 13 are circular in cross section, the rotation is prevented by the lower holding means 5 using the key 30. However, the sliding members 12 and 13 are used. The outer surface of the cross section angle, for example, hexagonal,
By making the inner surface of the lower holding means 5 for holding this correspondingly hexagonal, the detent means is not required.

[0038]

As described above, according to the present invention, in the multi-axis drilling machine, the axis row surface itself can be easily modified centering on the center of the axis row, and the structure becomes simple. The advantage is brought about.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a three-axis drilling machine.

FIG. 2 is a plan view of a normal drilling state.

FIG. 3 is a plan view of an example of a bent state of a hole.

FIG. 4 is a schematic front view of the three-axis drilling machine of the present invention.

FIG. 5 is a side view of the entire drilling equipment.

FIG. 6 is a longitudinal sectional view (lower part) and a transverse sectional view (upper part) of a main part of the three-axis drilling machine of the present invention viewed from the front side.

FIG. 7 is a longitudinal sectional view (lower part) and a transverse sectional view (upper part) of a main part of the three-axis drilling machine of the present invention viewed from the side.

FIG. 8 is a schematic perspective view.

FIG. 9 is a partial longitudinal sectional front view of an example of a sliding means.

FIG. 10 is a side view of a modification.

[Explanation of symbols]

1, 2, 3 ... drilling axis, 1A, 2A, 3A ... drilling bit,
1B, 2B, 3B ... stirring blades, 4 ... upper holding means, 5 ...
Lower holding means, 5T: inclined surface, 6: rotation driving means, 7:
Base machine, 8 ... Leader, 9 ... Mast, 12, 13 ...
Sliding members, 12T, 13T: inclined surface, 22, 23: sliding means, 30: key, 31: operating flange, X: excavating mechanism, Y: holding mechanism.

Claims (3)

(57) [Claims] 1. A plurality of drilling axes are arranged in parallel and with a predetermined row of rows on a cross section, and holding means for holding the upper and lower parts are provided. A multi-axis drilling machine having a drilling mechanism having rotation driving means for rotating around a center moves forward and backward along a holding mechanism fixed to the ground, and drills with the drilling shaft in a forward movement process. A sliding member is provided between the drilling shaft of the portion and the at least lower holding means, and the sliding member is fitted inside the holding means with an inclined surface inclined with the axis of the drilling shaft. Wherein the drilling shaft is rotatably held in a sliding member; and a sliding means for relatively moving the at least the endmost drilling shaft and the lower holding means in the axial direction. Relative sliding by this sliding means A multi-axis drilling machine having a hole bending correction function, wherein the sliding member is configured to move in the axial direction. 2. A jack means is provided between the end of at least the endmost drilling shaft and the upper holding means for moving the drilling shaft at the extreme end back and forth with the upper holding means as a seat. 2. A multi-axis drilling machine having a hole bending correcting function according to claim 1, wherein said sliding means is constituted by a sliding means. 3. The jack means has a jack body having one of a cylinder side and a piston side fixed to an upper holding means, and the other of which is rotatable around an axis with respect to a drilling axis. 2. A multi-axis drilling machine having a hole bending correcting function according to claim 1, wherein the multi-axis drilling machine has a structure in which the bearing is interposed so as to be immovable in the front-rear direction with respect to the outer surface of the drilling shaft.