JP2021046679A - Multi-shaft excavation device - Google Patents

Abstract

To solve the problems in which an excavation hole of the sliding contact part of a sliding contact body collapses because of the structure in which conventionally an excavation shaft is supported by the sliding contact body that slides into the wall surface of excavation holes regardless of ground properties of the work site, and a load is applied to part or all of multiple excavation shafts in the front-back and left-right sides, or the tip of the excavation head comes into contact with foreign matter such as rocks, causing the multiple excavation shafts to bend forward, backward or sideways, and excavation holes bend.SOLUTION: A multi-shaft excavation device is structured as such that multiple excavation shafts 7 driven and rotated by a drive device 5 mounted freely moveably up and down on a leader mast 3 provided on a base machine 2 installed on the ground are provided in parallel with the drive device 5, a pair of outer excavation shafts 7B are provided on both sides of a central excavation shaft 7A in the center among the group of multiple shafts 7, among the group of multiple excavation shafts 7 the central excavation shaft 7A has higher rigidity than the outer excavation shaft 7B thanks to a rigidity improvement configuration 20.SELECTED DRAWING: Figure 2

Description

The present invention relates to a multi-axis excavator that excavates an excavation hole.

The conventional multi-axis excavator has a configuration in which a plurality of excavation shafts are arranged side by side in a drive mechanism consisting of a hydraulic motor and a speed reducer, and a sliding contact body is provided on the outer periphery of the excavation shaft in sliding contact with the wall surface of the excavation hole. Is known (see Patent Document 1)

Japanese Unexamined Patent Publication No. 2005-282182

In the above-mentioned known example, the excavation shaft is supported by a sliding contact body that is in sliding contact with the wall surface of the excavation hole regardless of the properties of the ground at the work site, so that the excavation hole in the sliding contact portion of the sliding contact body collapses. There are challenges.
In addition, a load is applied to a part or the whole of a plurality of excavation shafts in the front-rear and left-right directions, or the tip of the excavation head comes into contact with a foreign substance such as a rock, and the plurality of excavation shafts are bent in the front-rear and left-right directions to bend the excavation hole. There is a problem that it will end up.
The present invention provides a multi-axis excavation device capable of preventing bending of all or a part of a plurality of excavation shaft groups according to the ground properties of a work site with a simple configuration.

According to the first aspect of the present invention, a plurality of excavation shafts 7 driven and rotated by a drive device 5 mounted up and down on a leader mast 3 provided on a base machine 2 installed on the ground are provided in parallel with the drive device 5. A pair of outer excavation shafts 7B are provided on both sides of the central central excavation shaft 7A of the plurality of excavation shafts 7 groups, and the central excavation shaft 7A of the plurality of excavation shafts 7 groups has improved rigidity as compared with the outer excavation shaft 7B. It is a multi-axis excavator configured by increasing the rigidity according to the configuration 20.
According to the second aspect of the present invention, the rigidity improving configuration 20 includes a diameter-increasing means 21 for increasing the diameter of the central excavation shaft 7A from the outer excavation shaft 7B and a layer for increasing the thickness of the central excavation shaft 7A from the outer excavation shaft 7B. Selectively combine any one or a plurality of means of the thickening means 22 and the reinforcing material attaching means 24 for attaching the reinforcing material 23 to the outer peripheral surface of the central excavation shaft 7A, or all the means. It is a multi-axis excavator with a configuration that can be selected and adopted.
According to the third aspect of the present invention, the rigidity improving configuration 20 is provided with a diameter-increasing means 21 for increasing the diameter of the central excavation shaft 7A from the outer excavation shaft 7B, or the central excavation shaft 7A from the outer excavation shaft 7B. Select one or more of the configuration in which the layer thickening means 22 for increasing the thickness is provided and the configuration in which the reinforcing material attaching means 24 for attaching the reinforcing material 23 is provided on the outer peripheral surface of the central excavation shaft 7A, or all are selected. This is a multi-axis excavation device having a configuration in which the central excavation shaft 7A is attached to the drive device 5.

In the invention of claim 1, among the plurality of excavation shafts 7 groups, the central excavation shaft 7A is configured to have higher rigidity by the rigidity improving configuration 20 than the outer excavation shaft 7B. The excavation shaft 7A can support the load applied in the direction of bending the outer excavation shaft 7B back and forth or left and right, and it is possible to prevent the entire group of the plurality of excavation shafts 7 from bending back and forth or left and right with the drive device 5 as a fulcrum.
In the invention of claim 2, the rigidity improving configuration 20 is provided with a diameter-increasing means 21 for increasing the diameter of the central excavation shaft 7A from the outer excavation shaft 7B, or the thickness of the central excavation shaft 7A from the outer excavation shaft 7B. The central excavation shaft 7A selected by selecting one of the configuration in which the layer thickening means 22 for thickening is provided or the configuration in which the reinforcing material mounting means 24 for attaching the reinforcing material 23 is provided on the outer peripheral surface of the central excavation shaft 7A is selected. Since it is configured to be attached to the drive device 5, the central excavation shaft 7A having the optimum rigidity improving configuration 20 can be selected and attached to the drive device 5 according to the properties of the ground at the work site, and a plurality of excavations can be easily performed. It is possible to prevent the entire or part of the shaft 7 group from bending back and forth or left and right.
In the invention of claim 3, since the rigidity improving configuration 20 can select any one or all of the thickening means 21, the layer thickening means 22, and the reinforcing material attaching means 24, the properties of the ground at the work site and the like can be further selected. The central excavation shaft 7A having the optimum rigidity improving configuration 20 according to the above can be selected and attached to the drive device 5, and the whole or a part of the plurality of excavation shaft 7 groups can be easily bent back and forth or left and right. Can be prevented.

Side view of the base machine and multi-axis drilling machine. Front view and cross-sectional view of the multi-axis drilling machine. Front view and cross-sectional plan view of the multi-axis drilling equipment near the connecting body. Front view near the excavation head. Front view and cross-sectional view of another embodiment of the multi-axis drilling device. Front view and cross-sectional plan view of the vicinity of the connection. Front view near the excavation head. Side view of the base machine and multi-axis drilling machine of other embodiments. Front view and cross-sectional view of the drilling device. Front view and cross-sectional plan view of the vicinity of the connection. Front view near the excavation head.

An embodiment of the present invention will be described with reference to the drawings, wherein 1 is a multi-axis drilling device, which is suspended by a wire 4 from the upper part of a leader mast 3 standing on a base machine 2 having a crawler or the like (FIG. 1). A drive device 5 driven by a hydraulic motor, a speed reducer, or the like is attached to the leader mast 3 so as to be able to move up and down. A plurality of output shafts 6 are provided in the drive device 5, and a plurality of excavation shafts 7 (three in the figure) are arranged in parallel on each output shaft 6.
The excavation shaft 7 of the present embodiment is provided with outer excavation shafts 7B on the left and right outer sides of the central central excavation shaft 7A to form a plurality of excavation shaft groups.
The plurality of excavation shafts 7 groups are connected by a connecting body (connecting band) 10 that connects and supports each other.

The configuration of the connecting body 10 is arbitrary, but as an example, a pair of semi-cylindrical shaft contact portions 11 that abut on the outer circumference of each excavation shaft 7 are provided in the front and rear, and on the left and right sides of each shaft contact portion 11. Each of the vertical flange portions 12 is provided, and each shaft contact portion 11 is brought into contact with the outer circumference of the excavation shaft 7 from the front-rear side, and in this state, each vertical flange portion 12 is fixed by a bolt 13.
Then, vertical plate-shaped connecting flanges 15 projecting in the left and right radial directions are provided on the left and right sides of each shaft contact portion 11, and each connecting flange 15 is fixed together with the vertical flange portion 12 by bolts 13.

Of the plurality of excavation shafts 7 groups, the central excavation shaft 7A is configured to have higher rigidity than the outer excavation shaft 7B by the rigidity improving configuration 20.
That is, the whole or a part of the plurality of excavation shafts 7 groups may bend back and forth or left and right with the center of the drive device 5 as a fulcrum due to factors such as a load being applied unevenly to one of the left and right central excavation shafts 7A. In the present invention, since the central excavation shaft 7A is configured to have higher rigidity than the outer excavation shaft 7B by the rigidity improving configuration 20, the central excavation shaft 7A can support the load, and a plurality of excavation shafts can be supported. It is possible to prevent all or part of the 7 groups from bending back and forth or left and right, and as a result, the excavation hole can be made difficult to bend.

The configuration of the rigidity improving configuration 20 of the central excavation shaft 7A is arbitrary, but as an example, a diameter-increasing means 21 (FIG. 2) for making the diameter of the central excavation shaft 7A larger than that of the outer excavation shaft 7B and the outer excavation shaft Either the layer thickening means 22 (FIG. 5) for thickening the central excavation shaft 7A from 7B or the reinforcing material attaching means 24 (FIG. 9) for attaching the reinforcing material 23 to the outer peripheral surface of the central excavation shaft 7A. One means or a plurality of means are selectively combined, or all means are selected and adopted to form a configuration.
Therefore, the central excavation shaft 7A having the optimum rigidity improving configuration 20 can be selected and attached to the drive device 5 according to the ground properties of the work site, and all or part of the plurality of excavation shafts 7 groups can be moved back and forth. Alternatively, it can be prevented from bending left and right, and as a result, the excavation hole can be made difficult to bend.

Further, since the central excavation shaft 7A can be replaced only or the central excavation shaft 7A and the connecting body 10 can be replaced only, the workability can be improved and the construction period can be shortened.
In the rigidity improving configuration 20, the diameter-increasing means 21 has a larger diameter of the central excavation shaft 7A than that of the outer excavation shaft 7B (FIG. 3).
FIG. 4 shows a state in which the excavation head H is attached to the lower part of the plurality of excavation shafts 7 groups, and the central excavation shaft 7A provided with the excavation head H and the outer excavation shaft 7B are formed to have the same diameter, and each excavation head H is formed. Are rotated in opposite directions, but may be rotated in the same direction.

FIG. 5 shows a group of excavation shafts 7 to which the layer thickening means 22 is applied in the rigidity improving configuration 20, and the thickness of the hollow tubular shaft of the central excavation shaft 7A is thicker than that of the outer excavation shaft 7B. It is said.
Although the external dimensions of the central excavation shaft 7A and the outer excavation shaft 7B are substantially the same in FIG. 5, although this point is not shown, the central excavation shaft 7A has a larger diameter than the outer excavation shaft 7B and is a hollow cylinder. If the thickness of the shaped shaft is increased, the diameter-increasing means 21 and the layer-thickening means 22 are combined.

FIG. 9 and below show the reinforcing material attaching means 24 for attaching the reinforcing material 23 to the outer peripheral surface of the central excavation shaft 7A in the rigidity improving configuration 20, and the reinforcing material 23 has a length substantially the same as that of the central excavation shaft 7A. It is formed of a plate member and attached to four places on the outer peripheral surface of the central excavation shaft 7A to form the reinforcing material attaching means 24. However, if the reinforcing material 23 is provided at a plurality of places in the circumferential direction of the central excavation shaft 7A, Often, there may be two or eight locations.
Further, when the reinforcing material 23 is provided on the entire circumference of the outer circumference of the central excavation shaft 7A, the diameter becomes larger than that of the outer excavation shaft 7B, and the diameter increasing means 21 and the reinforcing material attaching means 24 are used in combination.

(Operation of this embodiment)
In the present invention, the drive device 5 is suspended from the leader mast 3 of the base machine 2 by a wire 4, and the excavation shaft 7 is mounted in parallel on each of the plurality of output shafts 6 of the drive device 5. The plurality of excavation shafts 7 are connected and supported by the connecting body 10.
In this state, when the drive device 5 is lowered with respect to the leader mast 3 for excavation and the plurality of excavation shafts 7 are excavated to a predetermined depth and reach the planned excavation depth, the work is completed and the excavation planned depth is reached. When it has not reached, the plurality of excavation shafts 7 are removed from the drive device 5, and each of the following plurality of excavation shafts 7 is added to the upper part of the plurality of excavation shafts 7 in the partial ground to perform the excavation work. To resume.

In this excavation work, when a plurality of excavation shafts 7 groups are hit by the excavation resistance of the ground or a foreign matter such as a large rock on the excavation shafts 7, the load causes the whole or part of the plurality of excavation shafts 7 groups to move back and forth. Alternatively, it is attempted to bend to the left or right, but in the present invention, the central excavation shaft 7A is configured to have higher rigidity than the outer excavation shaft 7B by the rigidity improving configuration 20 among the plurality of excavation shafts 7 groups, so that it is driven. It is possible to prevent the whole or a part of the plurality of excavation shafts 7 groups from bending back and forth or left and right with the center of the device 5 as a fulcrum, and as a result, it is possible to make the excavation hole difficult to bend.

The structure of the rigidity improving configuration 20 includes a diameter-increasing means 21 that increases the diameter of the central excavation shaft 7A from the outer excavation shaft 7B, and a layer-thickening means 22 that increases the thickness of the central excavation shaft 7A from the outer excavation shaft 7B. Any one or a plurality of means may be selectively combined with the reinforcing material attaching means 24 for attaching the reinforcing material 23 to the outer peripheral surface of the central excavation shaft 7A, or all means may be selected and adopted. Since it has a configuration, the central excavation shaft 7A having the optimum rigidity improving configuration 20 can be selected and attached to the drive device 5 depending on the properties of the ground at the work site and the like.

Further, since the central excavation shaft 7A can be replaced only or the central excavation shaft 7A and the connecting body 10 can be replaced only, the workability can be improved and the construction period can be shortened.
Further, in preparation for adopting the thickening means 21, the distance between the output shafts 6 of the drive device 5 is arranged so that the large-diameter central excavation shaft 7A can be mounted, and the large-diameter central excavation shaft 7A excavates the outside. Prevents interference with the shaft 7B.

Further, when the reinforcing material attaching means 24 for attaching the reinforcing material 23 is provided on the outer peripheral surface of the central excavation shaft 7A, in the present embodiment, a long metal plate member having a predetermined thickness is used on the outer peripheral surface of the central excavation shaft 7A. Since the formed reinforcing material 23 is fixedly attached to the outer periphery of the central excavation shaft 7A by means such as welding, the reinforcing material attaching means 24 is used instead of the central excavation shaft 7A attached to the drive device 5. Workability can be improved by simply replacing the central excavation shaft 7A that has been provided.

1 ... Multi-axis drilling device, 2 ... Base machine, 3 ... Leader mast, 4 ... Wire, 5 ... Drive device, 6 ... Output shaft, 7 ... Drilling shaft, 7A ... Central drilling shaft, 7B ... Outer drilling shaft, 11 ... Shaft contact part, 12 ... Vertical flange part, 13 ... Bolt, 15 ... Connecting flange, 16 ... Bolt, 20 ... Rigidity improving configuration, 21 ... Diameter increasing means, 22 ... Layer thickening means, 23 ... Reinforcing material, 24 ... Reinforcing material mounting means.

Claims (3)

A plurality of excavation shafts 7 driven and rotated by a drive device 5 mounted up and down on a leader mast 3 provided on a base machine 2 installed on the ground are provided in parallel with the drive device 5, and a plurality of excavation shafts 7 groups are provided. A pair of outer excavation shafts 7B are provided on both sides of the central central excavation shaft 7A, and among the plurality of excavation shafts 7 groups, the central excavation shaft 7A is made more rigid by the rigidity improving configuration 20 than the outer excavation shaft 7B. Multi-axis excavator constructed in. In claim 1, the rigidity improving configuration 20 includes a diameter-increasing means 21 for increasing the diameter of the central excavation shaft 7A from the outer excavation shaft 7B and a layer thickness increasing thickness of the central excavation shaft 7A from the outer excavation shaft 7B. Selectively combine any one or a plurality of means of the means 22 and the reinforcing material attaching means 24 for attaching the reinforcing material 23 to the outer peripheral surface of the central excavation shaft 7A, or select all the means. A multi-axis excavator with a configuration that can be adopted. In claim 1 or 2, the rigidity improving configuration 20 is provided with a diameter-increasing means 21 for increasing the diameter of the central excavation shaft 7A from the outer excavation shaft 7B, or the central excavation shaft from the outer excavation shaft 7B. One or more of the configuration in which the layer thickening means 22 for increasing the thickness of 7A is provided and the configuration in which the reinforcing material mounting means 24 for attaching the reinforcing material 23 is provided on the outer peripheral surface of the central excavation shaft 7A is selected, or a plurality of configurations are selected. A multi-axis excavator having a configuration in which all selected central excavation shafts 7A are attached to the drive device 5.

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