JPS6355596B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rotary shaft excavator.

Figures 1 and 2 show typical conventional pit drilling machines, and Figure 1 is a so-called travel rotary type, in which a pit body assembly 1 for excavating the ground is connected to a drill pipe. A rotary device 3, which hangs down by the pipe 2 and rotates while driving the upper end of the pipe 2, is raised and lowered along the portal mast 5 via the thrust jack 4, excavates the ground via the assembly 1, and excavates the ground through the gate. The shaped mast 5 guides the rotary device 3 and supports rotational reaction force.

Fig. 2 shows what is called a rotary table type, in which a drilling tool 6 such as a three-winged bit is suspended through a drill pipe 7, and the drill pipe 7 is rotated by a rotary device 8 through a Kelly bar 9. is configured to do so. A rotary device 8 is placed on the ground, and a drill string consisting of the drilling tool 6 and drill pipe 7 is supported by a winch wire 11 via a swivel joint 10.

The travel rotary excavator has advantages such as constant thrust excavation, no need for a large crane, and good verticality of the excavation hole, but disadvantages such as heavy equipment weight and large working space. There is.

Rotary table excavators have the advantage of being small in weight and requiring a small working space, but they also have disadvantages such as difficulty in constant thrust excavation, the need for a large crane, and poor perpendicularity of the excavation hole. be.

An object of the present invention is to provide a rotary shaft excavator that can perform both a travel rotary type and a rotary table type shaft excavator by dividing each function of the shaft excavator into components. This was proposed as a system in which a rotating device configured to rotate the main shaft via a Kelly bushing on a rotary table and a thrust bearing box that supports the thrust of the drill strings are individually removably attached to a common frame. This relates to a vertical hole excavator characterized by:

In the present invention, as described above, the thrust load is made up of a rotating device part that transmits rotational force configured to rotate the main shaft via a kelly bushing to the rotary table, and a thrust bearing box that supports the thrust of the drill strings. The rotating device and the thrust bearing box are mounted on a common frame, and the main shaft of the rotating device and the rotating shaft of the thrust bearing box are connected within the same frame, and the frame is connected to the main shaft of the thrust bearing box. By supporting it on a shaped mast via a thrust jack, a travel rotary type vertical hole excavator can be constructed.

In addition, the rotating device is installed on the ground as a subassembly, and the upper part of the Kelly bar, which is vertically movable inserted into the Kelly bush, is attached to the thrust bearing box, and the bearing box is suspended with the hook of the crane, thereby creating a rotary table. This method can constitute a vertical hole excavator.

As described above, according to the shaft excavator of the present invention, by combining or dividing the rotary device and the thrust bearing box, both the travel rotary method and the rotary table method can be used, and the same machine can be used. can be used multiple times to improve the operating rate.

The present invention will be described below with reference to the illustrated embodiments.

In FIG. 3, 21 is a rotating device, and a motor 22
and pinion 2 attached to the drive shaft of the same motor.
3. Swivel bearing 2 that meshes with the pinion 23
A rotary table 25 where 4 is arranged, and a kelly bush 2 attached to the rotary table 25.
6 and a main shaft 27, the rotational force of the motor 22 drives and rotates a rotary table 25 via a pinion 23 and a swing bearing 24 meshing with the pinion, and finally rotates the main shaft 27 through a Kelly bush 26.

The rotating device 21 can be handled as a subassembly and is detachably attached to the lifting frame 28.

On the other hand, the thrust bearing box 29 contains a rotating shaft 30 and a thrust bearing 31, and is similarly attached to the lifting frame 28 as a subassembly.

The main shaft 27 of the rotating device 21 and the rotating shaft 30 of the thrust bearing box 29 are connected within the lifting frame 28, and the lifting frame 28 is supported by a portal mast via a thrust jack. As a result, a travel rotary type pit excavator is constructed.

FIG. 4 shows a case in which a rotary table type pit excavator is constructed, in which the rotating device 21 is installed on the ground as a subassembly, and instead of the main shaft 27 in FIG. A thrust bearing box 29 (swivel joint) is attached to the upper part of the Kelly bar 32, which is movably inserted, and the thrust bearing box 29 is suspended by a crane hook 33.

In this way, the rotating device 21 and the thrust bearing box 2
By combining or dividing the machine 9, it becomes possible to use both the travel rotary method and the rotary table method for excavation, allowing the same machine to be used for multiple purposes and improving the operating rate.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various ways without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

1 and 2 are front views of a conventional travel rotary type pit excavator and a rotary table type pit excavator, respectively, and FIGS. 3 and 4 respectively show a travel rotary type pit excavator of the present invention. FIG. 2 is a vertical cross-sectional view showing the case where it is used as a rotary table type pit excavator as well as a rotary table type pit excavator. 21... Rotating device, 26... Kelly bush,
27... Main shaft, 28... Lifting frame, 29...
Thrust bearing box.

Claims (1)

[Claims] 1. A rotating device comprising a rotary table having a kelly bush in the center, a tubular body inserted into the kelly bush so as to rotate integrally with the kelly bush, and a rotation drive mechanism for the rotary table, and a cylinder connected above the tubular body. A thrust bearing box comprising a cylindrical rotating shaft and a thrust bearing rotatably supporting the cylindrical rotating shaft, and the entire rotating device and the thrust bearing box are raised and lowered as one, or only the tubular body of the rotating device is moved up and down. A vertical hole excavator characterized by comprising a lifting mechanism that raises and lowers a thrust bearing box as one unit.