JPS6352197B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for excavating without a scaffold (stand) when excavating while applying rotation and impact force to a bit with a down-the-hole hammer.

[Prior Art and its Problems] Normally, when drilling while applying rotation and impact force to the bit, a dedicated holding device for the excavation equipment is required.

However, this requires a strong holding device, which of course increases the cost.
It takes a lot of effort to transport it to another construction site and set it up again. Furthermore, when excavation is required on steep slopes, it is dangerous and often difficult to carry out.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an excavation device that can perform excavation work extremely easily without requiring a scaffold (stand).

[Means for solving the problems] In order to solve the above problems, the device of the present invention has the following features:
A drilling equipment main body including a down-the-hole hammer and a drive device that rotates the down-the-hole hammer around an axis;
Cranes that suspend the excavation equipment body, guide posts installed on the ground that guide the descent of the excavation equipment body as it excavates, and cranes that are stretched between the cranes and the guide posts or drive devices. The installation position of the wires on the guide post or drive device is at a position offset from the line connecting the crane to the rotation center of the down-the-hole hammer in plan view. It is characterized by certain things.

[Operation] The present invention is completely different from the conventional example in that the excavation equipment main body is suspended by a crane or the like. Therefore, by changing the boom position of the crane, it can be easily moved to another construction site, and no special holding device is required. By extending the boom from flat ground, it is also possible to excavate on steep slopes while setting up guide posts. Further, if the excavating device is simply suspended, the driving device of the excavating device will rotate relative to the ground around the center of the down-the-hole hammer due to the resistance from the ground accompanying excavation, making it impossible to excavate. Therefore, wires are stretched directly to the drive device or via guide posts that guide it, and the other end is connected to the outside.
For example, by holding it on the above-mentioned crane, the above-mentioned co-rotation is prevented.

The inventor initially thought that excavation like the method of the present invention would be impossible. However, the reason why smooth excavation was possible with the actual machine is thought to be due to the fact that the weight of the excavator itself acts on the excavation surface, and that impact force and rotation act on the bit of the down-the-hole hammer.

On the other hand, according to the present invention, if the excavation equipment body is lowered along the guide post, it is suitable for ensuring the verticality of the excavation hole, and the excavation resistance is reduced, resulting in smooth excavation.

In this case, the wires may be attached to the drive device or may be attached to the guide post.
Of course, it may be attached to both.

[Specific Examples of the Invention] The present invention will be explained in more detail below with reference to the drawings.

FIG. 1A is a basic schematic diagram of the present invention with a guide post, which will be described later, omitted. Reference numeral 1 denotes a casing, and a down-the-hole hammer 2 having a drilling bit 2a is integrally attached to the tip of the casing. Reference numeral 3 denotes a rotational drive device, which, as shown in detail in FIGS. 6 and 7, includes a rotary cylinder 3A that chucks a chucked portion 1a provided at the head of the casing 1;
Drive motor 3C attached to housing 3B
and a transmission mechanism for transmitting the output thereof, which includes a gear 3a, a connecting shaft 3b, and a gear 3c.

The excavator main body configured in this manner is suspended by a vehicle crane 4. The suspension is carried out by extending the boom 4a and hooking the suspension wire 5 hanging from the head of the boom 4a onto the housing 3B of the drive device 3.

In addition, in order to prevent the drive device 3 from co-rotating due to rotary excavation, a co-rotation prevention wire 7 is provided between the horizontal mounting member 6 fixed to the drive device 3 and the crane 4.
Stretch it. The wire 7 is tensioned by the boom 4.
Pull it with tension wire 8 from the head of a.

On the other hand, when drilling, down-the-hole hammer 2
Air compressors 9A and 9B are provided to apply impact force to the air. 10 is a line oiler. The pressurized air is also used to discharge chips from cutting to the ground, but in order to increase its effectiveness, foam liquid is mixed into the air by a pump 11. The air mixed with the foam liquid is guided to the air supply port of the down-the-hole hammer 2 through the swivel 12. Further, hydraulic pressure is applied to the hydraulic drive motor 3C from a hydraulic unit 13 through a control device 14. 15 is a controller.

During excavation, while the main body of the excavation equipment is suspended by the crane 4, a rotational force is applied to the casing and the down-the-hole hammer 2 by the rotary drive device 3, and an impact force is applied to the bit 2a of the down-the-hole hammer 2 by air. To do this. At this time, by stretching the wire 7 in the direction of the crane 4, the rotary drive device 3 is prevented from rotating together. In addition, for the start of excavation,
Preferably, a guide casing 16 is used.

By the way, when the co-rotation prevention wire 7 is attached to the rotation drive device 3, it is attached in the opposite direction to the direction in which it is intended to rotate. In the illustrated example, as shown in FIG. 2, the rotary drive device tends to rotate counterclockwise due to the cutting resistance of the ground, as can be seen by considering the operating gear train. The tip of the wire 7 is attached to the attachment member 6 by being deviated to the right of the line l connecting to the hammer 2.

Although the structure of the down-the-hole hammer 2 is well known, it will be explained in detail with reference to FIGS. It reaches the lower surface of the piston 23, and pressure acts there to pull up the piston 23. As the piston 23 rises, the lower hole 22 is closed by the piston 23, and the upper hole 24 instead communicates with the upper surface of the piston 23, and pressure acts on the upper surface of the piston 23.
lower. 25 is a redirect valve, and 26 is a foot valve. In this way, the piston 23
is repeatedly moved up and down, and an impact force is applied to the bit 2a.

FIG. 1B shows a specific example according to the present invention,
In order to stabilize the excavating device main body, a guide post 30 is provided upright, along which the excavating device main body is lowered.

To the guide post 30, rail flanges 32, 33 are attached to a square steel pipe 31, and a guide body 40 is attached to the housing 3B of the drive device 3, and the flanges 32, 3 are attached by the wheels 41, 42, 43, 44.
3, and the wheels 45 are brought into contact with the end surfaces of the flanges 33.

By arranging the guide post 30 and the guide body 40, it is possible to cope with the tendency of the head of the excavating device body to swing if it is simply suspended by the wire 5, and it is possible to perform vertically stable excavation.
Note that the guide post 30 is suspended by a crane 4 to prevent it from falling over.

In the case of such a configuration, a co-rotation prevention wire may be attached to the drive device 3;
As shown in the figure, the mounting member 6A is attached to the guide post 30.
Even if wire 6B is fixed and wires 7A and 7B are attached to it, rotation can be similarly prevented. Moreover, when holding the wires 7, 7A, and 7B, the wires 7, 7A, and 7B may not be held by the crane 4, but may be fixed to other stable locations.

According to the present invention, as long as the boom of the crane 4 can reach, construction on steep slopes can be easily carried out as shown in FIG. In this case as well, guide posts are erected.

[Effects of the Invention] As described above, according to the present invention, excavation can be carried out by simply suspending the excavation equipment main body, which eliminates the need for scaffolding, expands the scope of construction, and makes construction extremely easy.

[Brief explanation of the drawing]

FIG. 1A is a schematic diagram showing a basic example of the present invention;
Figure B is a schematic diagram of a specific example guided by a guide post according to the present invention, Figure 2 is a plan view showing a manner in which the co-rotation prevention wire is stretched, and Figure 3 is a cross-sectional view of a device for guiding the guide post. , FIG. 4 and FIG. 5 are longitudinal cross-sectional views of the down-the-hole hammer, FIG. 6 is a vertical cross-sectional view of the drive device, FIG. 7 is a plan view thereof, and FIG. 8 is a diagram showing the state of excavation on steep slopes. DESCRIPTION OF SYMBOLS 1...Casing, 2...Down-the-hole hammer, 2a...Drilling bit, 3...Rotary drive device, 4...
Crane, 5... Hanging wire, 7... Co-rotation prevention wire, 30... Guide post.

Claims (1)

[Claims] 1. An excavation equipment body equipped with a down-the-hole hammer and a drive device that rotates the down-the-hole hammer around its axis, and cranes that suspend the excavation equipment body;
A guide post erected on the ground that guides the excavation equipment body as it descends during excavation, and wires for preventing co-rotation stretched between the cranes and the guide post or drive device, An excavation device characterized in that the attachment position of the wires to at least one of the guide post or the drive device is offset in plan view from a line connecting the cranes to the rotation center of the down-the-hole hammer. .