JPS5858516B2 - rotary shaft drilling machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to rotary shaft boring machines such as shaft boring machines, reverse circulation drills, and raise polling machines.

To explain the outline of a conventional rotary shaft excavator using diagrams, in Fig. 1, a cutter head 1 for rotary excavating the ground is shown.
For example, through a drill pipe 4 that transmits convex rolling force, it is rotatably driven by an upper rotary drive device 5 to excavate a vertical hole. A heavy thrust force is applied by the weight 2, and in addition to the cutter head 1, the pit body alignment a usually incorporates the weight 2 and a stabilizer 3 for maintaining its posture.

In such excavation equipment, since the thrust force of the cutter head 1 necessary for ground excavation is given by the weight of the weight 2, the bit body alignment generally becomes heavy.

b. The excavator itself, including the equipment for suspending the heavy pit hob, also becomes larger.

C1 Therefore, it is difficult to install a large excavator, and in extreme cases, it becomes impossible to install it, especially in places where the payload is limited, such as on offshore work platforms.

d. Since drilling is performed using a weight, there is no suitable method for correcting hole bending other than the so-called pendulum effect, and there is no other way than to prevent hole bending using an economical construction method.

There are problems such as.

Further, FIG. 2 shows an example of mounting the excavator 6 on the offshore work platform 8. The main body of the excavator 6 is installed on the aerial trolley 10 on the offshore work platform 8, and the drill pipe is moved by the rotary drive device 5. The cutter head 1 is rotationally driven through 4, and the tidal current,
In order to protect the drill string from waves, drilling reaction force, etc., the guide pipe T is arranged using an aerial trolley 10 and an underwater trolley 11 as support points, and the guide pipe 7 is held and moved up and down by a guide pipe holding device 9. It looks like this.

Furthermore, FIG. 3 shows a lower drive type vertical hole excavator that is different in type from those shown in FIGS. 1 and 2, and the gripper device 12
The excavator body is fixed to the peripheral hole wall or guide pipe, etc., and the rotational force of the rotary motor 13 is transmitted to the rotary main shaft 19 via the reduction gear 18 to rotationally drive the cutter head 1, and the thrust is generated by the thrust gear. By operating the lever 14, the force is transmitted to the main shaft 19 via the thrust bearing 16,
The rotational torque reaction force is transmitted to the gripper device 12 by the torsion arm 15 or the like, and the gripper device 12 also receives the reaction force of the thrust.

17 is a radial bearing on which the main shaft 19 slides, and power for driving the rotary motor 13 is usually supplied from above (ground) through a hose or a table, and the main shaft 19 is normally supplied from the top (ground) through a hose or a table. It is designed to be conveyed to the upper part through a swivel 20 and a mud water pipe or a hose 21.

In a device like this, the rotational reaction force and thrust reaction force can be received by the hole wall, so in the case of hole wall collapse, rotation,
It becomes impossible to excavate, and since it is watertight, it requires a pressure-resistant structure equipped with a sealing device.Furthermore, there are problems such as poor maintenance of the excavator.

The present invention relates to a rotary pit excavator that eliminates the above-mentioned problems, in which a drill pipe is rotated by a rotary drive device installed at the top, and the ground is cut by a cutter head connected to the lower end of the drill pipe. In a rotary shaft excavator configured for drilling, there is a fixing mechanism to the peripheral hole wall or a guide shaft, and a thrust load is applied to the bit body alignment via a rolling element or a sliding element connected to the fixing mechanism. The invention is characterized in that a fixed-side thrust device comprising a plurality of thrust mechanisms for controlling the digging direction is installed directly above the bit body alignment,
The purpose of this is to provide a thrust adding mechanism that does not rely on a weight to selectively apply all or part of the thrust in a model equipped with a rotary drive device on the top, and to prevent the bending of the hole. It is an object of the present invention to provide a rotary shaft excavator that can forcibly correct the situation and can cope with excavation conditions even when heavy excavation is difficult or inappropriate.

The present invention has the above-mentioned configuration, and includes a fixing mechanism to the peripheral hole wall or the guide shaft, and a thrust load applied to the pit hobby assembly via the rolling element or sliding element connected to the fixing mechanism. The thrust device on the fixed side, which is equipped with a plurality of thrust mechanisms for controlling the force and direction of excavation, is installed directly above the pit body alignment, so that the thrust device can be connected to the peripheral hole by the fixing mechanism. Wall or guide/ζ iso.

It is possible to apply arbitrarily selected thrust force to the bit body assembly using multiple thrust mechanisms via sliding elements or rolling elements, and it is possible to apply sufficient thrust to suit the cutter head milling conditions of pit body assembly. This allows the excavation to proceed smoothly, and it is also possible to omit the weight of the pit body alignment part, making it possible to make the excavator lighter and smaller.

Further, in the present invention, if it is difficult to fix the thrust device due to a defect in the hole wall, etc., the thrust device can be removed and the weight can be suspended, thereby changing to the conventional excavation method.

Furthermore, in the present invention, it is possible to provide a plurality of thrust mechanisms and to apply a thrust thrust to the bit body alignment via rolling elements or sliding elements, and to apply the thrust thrust to be applied to the pit body alignment. By deflecting, the digging direction of the bit body alignment can be forcibly controlled and the hole can be corrected.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 4 and 5 show a first embodiment of the present invention, in which a cutter head 1 is rotatably driven by a rotary drive device 5 on the upper part of the drill bit through an eave 4, and is connected to the ground. The thrust load required for the ground is given by the weight 2' and the thrust device 22 described later, and the thrust load required for the ground can be applied by removing it or by connecting the hollow drill collar 2' and using the thrust device 22 alone. It can be used to provide thrust thrust.

As shown in FIGS. 5A and 5B, the thrust devices 22 are arranged on the main frame 25 and the peripheral wall of the main frame 250, and have a plurality of (four in the figure) that are expanded and contracted in the radial direction by an appropriate mechanism not shown. ) is arranged on the peripheral wall of the main frame 25,
A thrust device consisting of a plurality of (four in the figure) thrust jacks 26, in which a rolling element or sliding element 24 attached to the tip of a rod is brought into contact with a table 23 on the pit body assembly a, that is, a plurality of thrust mechanisms. The structure is as follows.

Each grit ζ device 12 of the fixing mechanism is for fixing the thrust device to the peripheral hole wall of the shaft or to the shaft hole (not shown), and the plurality of thrust mechanisms, that is, the thrust jacks 26 and , is for applying a thrust load to the pit body attachment a, that is, the cutter head 1, and directing it in an inclined direction.

A second embodiment is shown in FIGS. 6A, B, and C, in which a guide pipe I is used, a cutter head 1, a drill collar 2', a drill pipe 4, a table 23, a rolling element or a sliding element 24, and a main frame. 25, Thrust jack 2
Reference numeral 6 has a structure similar to that of the first embodiment, and in place of the gripper device 12 of the first embodiment, a plurality of (four in the illustration) lock jacks 2 are provided around the main frame 25.
7 is provided, and the wedge 28 attached to the rod end of the lock jack 27 is inserted between the peripheral hole wall or the guide pipe 7 and the main frame 25.
The structure is equipped with a fixing mechanism to fix it.

Note that the mechanism for fixing the thrust device to the peripheral hole wall or the guide pipe 7 is not limited to the gripper device 12 and wedge 28 shown in FIGS. 5 and 6, but may also include a mechanical locking mechanism with the guide pipe 7, etc. It can be done.

In addition, the thrust jack 26 and the gripper device 12
The lock jack 27 may be operated by an appropriate fluid pressure drive device (not shown) that can be operated from the ground.

The first and second embodiments have the above-described structure, and the drill pipe 4 is rotated by the rotation drive device 5 at the top, and the cutter head 1 at the tip thereof is rotationally driven.

In addition, the gripper device 12 is operated and comes into contact with the peripheral hole wall or the guide pipe 7, and the main frame 25 is fixed.

Alternatively, the wedge 28 of the lock jack 27 enters between the peripheral hole wall or the guide pipe 7 and the main frame 25 and is wedged, thereby fixing the main frame 25.

Furthermore, a plurality of thrust mechanisms, that is, each thrust jack 26, is activated to extend the rod, and the rolling element or sliding element 24 pushes the table 23, thereby applying a thrust thrust to the pit body alignment a equipped with the cutter head 1). (downward) to drill the hole.

When the stroke range of the thrust jack 26 has been excavated, the gripper device 12 or the wedge 28 is released, the thrust jack 26 is retracted, and the thrust device 22 is lowered by an appropriate means such as a rope (not shown). Excavation work can be performed again by repeating the process.

Next, when correcting hole curvature during hole adjustment, it is possible to correct the hole curvature by making a plurality of thrust mechanisms, that is, each thrust jack 26, unbalanced output and applying an unbalanced load on the pit body assembly a. can.

Taking FIG. 5 as an example, when it is desired to turn the excavation direction to the right, the adjustment is made by operating the left thrust jack 26 so that its output is greater than that of the right side.

In the embodiment of the present invention, as described above, the thrust device 22 is fixed by being actuated against the peripheral hole wall or the guide pipe 7 by the gripper device 12 or the fixing device of the wedge 28, and the plurality of By extending a plurality of thrust jacks 26, which are thrust mechanisms, the cutter head 1 is moved through rolling elements or sliding elements 24.
Since a thrust load can be applied to the pit body alignment a equipped with It can be made lightweight and small.

In addition, if it is difficult to fix the thrust device due to defects in the hole wall, etc., the thrust device, which is an independent mechanism, can be easily removed, allowing excavation work to be carried out in the same way as before by simply suspending the weight. .

Furthermore, a plurality of thrust mechanisms, each thrust jack 26
By arbitrarily applying the thrust, the direction of excavation of the pit body alignment can be controlled, and the curvature of the hole can be strongly corrected.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a conventional rotary hole-forming excavator, Figure 2 is a schematic diagram of the excavator shown in Figure 1 used as an offshore workbench, and Figure 3 is a schematic diagram of a conventional rotary hole-forming drilling machine.
The figure is a diagram of a conventional example of a lower-drive type hole-forming excavator, Figure 4 is a schematic diagram of the first embodiment of the present invention, and Figures 5A and B are enlarged views of the thrust device portion of Figure 4 and its A- A-line arrow view, Figure 6 A, B,
C is a side view of the thrust device part of the second embodiment and its B-B
They are a line arrow view and its CC line cross-sectional view (part 1). 1: cutter head, 2: weight, 3 stabilizer, 4
Nitrile pipe, 5: Rotary drive device, 6: Weight, 7: Guide pipe, 12 Nigelippa device, 23: Tifur, 2
4: Rolling element (sliding element), 25: Main frame, 26:
Thrust jack, 27: Lock jack, 28: Wedge,
a: Pit Hob Iarasen.

Claims (1)

[Claims] 1 In a reversible shaft drilling machine configured to rotate a drill pipe by a rotation drive device installed at the top and excavate the ground with a cutter head connected to the lower end of the drill pipe, the surrounding wall or its guide pipe is used. A thrust mechanism on the fixed side, which is equipped with a fixing mechanism to the fixing mechanism, and a plurality of thrust mechanisms that are connected to the fixing mechanism and apply a thrust load to the pit body alignment via rolling elements or sliding elements and control the excavation direction. A rotary shaft excavator, characterized in that a device is installed directly above the bit body alignment.