JPH0513830Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a drive device for rotating an excavator in an excavator that excavates a vertical hole in the ground using a rotary excavator with a long shaft.

(Prior Art) Conventionally, as a vertical hole excavator of this kind, for example, a rotary drive source consisting of a motor and a speed reducer is supported on a support frame that is attached to a mast so as to be able to rise and fall, and the output shaft is attached to a rod-type excavator. A screw auger excavator, which is formed by connecting the upper end of a screw auger, and a boom, as a kelly bar type excavation tool, have a kelly bar with a digging bucket at the lower end suspended from the ground in the middle of the boom. Drill bucket excavators are generally used, in which a Kelly bar holding cylinder is installed at a height of several meters to which rotation is transmitted from a motor, and the Kelly bar is inserted into the holding cylinder so as to be non-rotatable but slidable in the axial direction. Although the former method is effective for excavating all types of ground, both hard and soft, it has the disadvantage that soil, or slime, remains in the excavation hole, and separate means must be taken to remove it. Although it does not leave any slime and is particularly effective for excavating self-supporting sticky ground, it has the disadvantage that it is not suitable for excavating hard ground.

For example, in the case of vertical hole excavation for the construction of cast-in-place piles, if a vertical hole of the desired depth is first excavated with a screw auger excavator, and slime can be removed using a drill-bucket excavator, then it will be possible to create cast-in-place piles. Although it is possible to obtain the optimal vertical hole, it is a heavy economic burden to have two machines, a screw auger excavator and a drill bucket excavator, on standby at the site.
It's not something that can be done easily.

(Problems to be solved by the invention) This invention is an excavator that can selectively attach and use rod-type excavators and kelly bar-type excavators depending on the application, ground properties, etc. Provides an excavator drive device.

(Means for Solving the Problems) Therefore, the excavator drive device of the present invention includes a mast that is erected, a rotation drive unit that is attached to the mast so as to be able to rise and fall freely, and an adapter shaft, A rotary drive source is mounted on a support frame that is supported by the mast so as to be freely raised and lowered, and rotation is transmitted from the rotary drive source so that the Kelly bar of the Kelly bar type excavation tool cannot be rotated and is slidable in the axial direction. A Kelly bar holding cylinder having a through-holding hole to be freely inserted and held is rotatably supported vertically, and the adapter shaft is non-rotatably insertable and removable into the through-holding hole of the Kelly bar holding cylinder. It has a structure in which a joint is provided at the lower end to which the upper end of the rod type excavator is detachably connected and fixed.

In this case, the above-mentioned rod-type excavating tools include, in addition to screw augers, those having a digging blade at the lower end of the rod, those having an agitation blade at the lower end or the entire length of the rod, and various other types, as well as kelly bar type excavating tools. This includes those with a drill bucket attached to the lower end of the Kelly bar, those with screw blades on the lower end of the Kelly bar, and various other types. Embodiments of the present invention will be described below with reference to the drawings.

(Example) The excavating tool drive device of the present invention consists of a mast, a rotational drive unit attached to the mast so as to be able to move up and down, and an adapter shaft, and as shown in FIG. The mast 2 is supported vertically, and the support frame 4 is supported vertically and slidably on guide rails 3, 3, which are laid along the entire length of the front side of the mast 2 in the longitudinal direction, via slide fittings 5... At the same time, it is suspended by a wire 7 hanging from the top sheave 6 so as to be able to rise and fall freely, and this support frame 4 is equipped with a rotation drive source, a Kelly bar holding tube of a Kelly bar type excavator, and a rotation transmission mechanism to constitute a rotation drive section A. There is.

The structure of the rotation drive section A is as follows. In FIG. 2, a motor 8 as a rotational drive source and a reducer 9 are mounted on the support frame 4, and the output shaft 10 thereof is protruded downward.
On the lower surface of
2, and a Kelly bar holding cylinder 13 of a Kelly bar type excavating tool, which has passed through a holding hole 14 which is a square hole with a square cross section on its axis, is inserted vertically through bearings 15, 15 into the front overhang of the gearbox 12. The gearbox 12 is rotatably supported in this state, and both upper and lower surfaces of the front projecting portion of the gearbox 12 are opened to open the holding hole 14 to the outside.

The rotation transmission mechanism to the Kelly bar holding cylinder 13 is such that the upper end of a shaft 16 whose lower end is supported by a bearing 17 is connected to the output shaft 10 by a joint 18 in the rear part of the gearbox 12, and a gear 19 is connected to the shaft 16. In this structure, a gear 20 that meshes with the gear 19 is formed on the outer peripheral surface of the Kelly bar holding cylinder 13.

As shown in the second figure, the adapter shaft 21 is a shaft with a square cross section that can be fitted into the holding hole 14 of the Kelly bar holding cylinder, and has a head 22 with a larger diameter than the adapter shaft at its upper end, and a head 22 at its lower end that is larger in diameter than the adapter shaft. A joint plug 23 having a slightly thinner hexagonal cross section is also formed.

In this example, a screw auger 24 as shown in the first and second figures is prepared as a rod-type excavator connected to the adapter shaft 21, and the screw auger has a hexagonal cross-section joint provided at the upper end of the rod. A socket 2 with a hexagonal cross section is attached to the plug 25.
Joint double socket 26 with 7 and 27 on both ends
are fitted into one of the sockets 27, and the retaining pins 28, 28 are inserted and removably inserted to secure the connection.

In this example, as a Kelly bar type excavating tool that is inserted and held in the Kelly bar holding cylinder 13, a Kelly bar 29 having a square shaft with a square cross section is attached to the lower end of the Kelly bar 29, which is approximately the same as the maximum diameter of the screw auger 24, as shown in the third figure. A drill bucket 31 is prepared by removably connecting two commonly used drilling buckets 30 of the same diameter, and the removable connection means for the kelly bar 29 and the bucket 30 is, for example, a joint on the upper surface of the bucket 30. A cylinder 32 is provided protrudingly, and a bolt 33 with a head is inserted through the lower end of the joint cylinder 32 and the Kelly bar 29 inserted into the joint cylinder 32, and a snap pin 3 for preventing slipping is attached to the penetrating tip of the cylinder.
4 is inserted in a removable manner, and a wire connecting fitting 35 is attached to the upper end of the Kelly bar 29 via a swivel joint. Furthermore, drill bucket 3
1 is suspended from the top sheave 6 of the mast.

The operation of this example will be explained next along with an example of its use. First, when drilling a vertical hole with the screw auger 24 and removing slime with the drill bucket 31, insert the adapter shaft 21 into the holding hole 14 of the Kelly bar holding cylinder 13 from above, and then insert the joint plug 23 downward. Then, raise the screw auger 24 and insert it into the socket 2 of the joint double socket 26.
7 into the joint plug 23, insert the retaining pins 37, 37, and attach the screw auger 24 as shown in the first and second figures. When the motor 8 is started, rotation is transmitted to the screw auger 24 via the output shaft 10, shaft 16, gears 19, 20, holding cylinder 13, and adapter shaft 21, and vertical hole drilling is started by this rotating screw auger. After drilling a vertical hole of the desired depth, raise the screw auger 24 above the ground, then pull out the retaining pins 37, 37 to separate the screw auger 24 from the adapter shaft 21, and then move the adapter shaft 21 upward from the holding cylinder 13. Pull it out. Next, a wire 36 is connected to the wire connecting fitting 35 of the Kelly bar 29 separated from the bucket 30, the Kelly bar 29 is lifted by the wire, the Kelly bar 29 is inserted into the holding cylinder 13 from its lower end, and then the lower end Fit the part into the joint tube 32 of the bucket 30, and then
Insert and connect with bucket. After preparing in this way, the rotation is transmitted to the Kelly bar 29 and the bucket 30 via the holding cylinder 13 by starting the motor 8,
The rotating bucket 30 is inserted and lowered into the vertical hole to scrape off the slime. In this case, in a conventional drill bucket excavator, the Kelly bar holding tube is in a fixed position several meters above the ground, which limits the distance the bucket can drill into the ground by several meters. Since the drive unit A can be lowered along the mast 2 to near the ground surface, it is possible to dig several meters deeper than conventional drill bucket excavators. After scraping off the slime, the bucket 30 is pulled up to the ground, the bottom of the bucket is opened, and the slime is discharged.

Another example of use is drilling buckets in clay layers.
Excavate with screw auger 1, and use screw auger 2 to excavate the supporting layer.
4, use the drill bucket 3 as in the example above.
1 is attached, excavation is started using the rotary bucket cart 30. The excavation is performed by alternately repeating excavation and soil scraping by the bucket 30, and removal of soil from the bucket by raising the bucket 30 above the ground. Again, it can drill several meters deeper than traditional drill bucket excavators. Once the support layer is reached, the bucket 30 is raised to the ground and then the bucket 33 is lifted up.
is pulled out to separate the bucket 30 and Kelly bar 29, and then the Kelly bar 29 is pulled upward from the holding cylinder 13. Thereafter, the adapter shaft 21 is fitted into the holding cylinder 13, the screw auger 24 is connected in the same manner as described above, and the support layer is excavated by rotation of the screw auger.

In addition to the above example, various other rod type excavators and Kelly bar type excavators are selected and installed as appropriate depending on the purpose, ground properties, etc., and combined excavation according to the above example is performed.

The rotation transmission mechanism from the output shaft to the Kelly bar holding cylinder in the present invention is not limited to the gear train described above, but may be a belt, a chain, or other various mechanisms.

(Effect of the invention) According to the drilling tool drive device of the present invention that can selectively use two types of drilling tools, either the Kelly bar type drilling tool or the rod type drilling tool can be selected by inserting and removing the adapter shaft into one Kelly bar holding cylinder. As a result, a single excavator equipped with this device can perform many types of excavation depending on the purpose, ground properties, etc. In addition, the rod-type drilling tool can be provided with screw blades or stirring blades over its entire length or a considerable length, and the weight of the rotary drive part can be effectively applied to the rod-type drilling tool, and it can be used more easily than conventional drills. In a bucket excavator, the kelly bar holding tube is located at a fixed position several meters above the ground, which limits the distance the bucket can dig into the ground by several meters. Because it can descend closer, it can dig several meters deeper than conventional drill bucket excavators, and its practical value is extremely high.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention. Figure 1 is a side view of an excavator equipped with the drive device of the present invention, Figure 2 is an enlarged partial vertical sectional view of the rotary drive unit, and Figure 3 is a drill bucket installed. It is a sectional view same as the above. 2... Mast, A... Rotation drive unit, 4... Support frame, 8... Motor, 9... Speed reducer, 13...
...Kelly bar holding cylinder, 14...Holding hole, 21...
Adapter shaft, 23...Coupling plug, 24...Screw auger, 29...Kelly bar, 31...
Drill bucket.

Claims (1)

[Claims for Utility Model Registration] A mast that is erected, a rotary drive unit that is attached to the mast so as to be movable up and down, and an adapter shaft, the rotary drive unit being supported by the mast so that it can be movable up and down. A rotational drive source is placed on a support frame, and the rotation is transmitted from the rotational drive source, and the Kelly bar has a through-holding hole through which a Kelly bar of a Kelly bar type excavation tool is inserted and held in a non-rotatable and axially slidable manner. The holding cylinder is vertically supported and rotatably supported, and the adapter shaft is non-rotatably insertable and removable into the through-holding hole of the Kelly bar holding cylinder, and the upper end of the rod-type excavator is detachably attached to the lower end. An excavating tool drive device that allows you to select and use two types of excavating tools, which is equipped with a joint to connect and fix.