JPS6250590A - Vertical hole boring machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a shaft boring machine used for drilling large-diameter, deep shafts.

[Conventional technology] There are two types of vertical boring machines that drill deep underground: air lift type and pump suction type.
In either method, a cutter with a cutter bit at the lower end is suspended via an attached drill pipe, and rotational force is transmitted to the drill pipe to rotate the cutter while drilling under its own weight. They have something in common.

An example of an air lift type vertical hole boring machine is as shown in Fig. 2, in which a cutter 1 with a cutter bit 2 attached to the lower end is rotated via an attached drill pipe 3 and lowered by its own weight. The drill pipe 3 is suspended by a lifting crane 6 on the ground via a clipper 4 and a swivel 5, and rotational force to the drill pipe 3 is applied by a turntable 1.

When drilling with this air lift type vertical hole boring machine, the cutter 1 is rotated and lowered by its own weight via the drill pipe 3, and at the same time air is passed through the air pipe 9 from the ground compressor 8 into the drill pipe 3. The apparent specific gravity of the muddy water is lowered by blowing into it, and the difference in specific gravity with the muddy water outside the drill vibe 3 causes the flowing water to rise, thereby continuously discharging the cutting debris to the ground. This is to allow continuous drilling by pouring the excavated waste through the borehole 11, allowing the cuttings to settle and separate, and allowing only water to flow back into the borehole 11.

In addition, the pump suction type pit boring machine is
Although not shown in the diagram, during excavation, Taisei's cuttings are continuously sucked up along with water by a suction pump and poured into an above-ground settling tank, where the cuttings are allowed to settle and separate, and then only the water is returned to the borehole. During this time, the cutter is lowered by its own weight while drilling the hole.

Conventional vertical hole boring machines of any of the above types can be used to drill deep underground with the addition of a drill vibrator, and are currently capable of drilling to a depth of about 180 m.

[Problem to be solved by the invention 1 However, about 100
It is practically impossible to excavate to a depth of 0 m using conventional excavations. The reason for this is that when adding drill vibes one after another, a lot of drill pipes are required to lower the cutter under its own weight to a deep depth of 1000 m, which increases the weight of the drill vibe alone. This is because it cannot be supported by a lift above the ground. For example, when the diameter of the cutter bit portion is 7IIl, at a depth of 1000i, the weight of the drill vibrator alone becomes a large load exceeding 1ooot.

Not only is it difficult to support such a large load on the ground, but there is also the possibility that the drill pipe itself may pack ring due to its own weight.

Therefore, the present invention eliminates the occurrence of such problems and achieves 100% improvement.
The aim is to enable excavation as deep as 0m.

[Means for Solving the Problems] The present invention integrates a float on the outside of each drill vibrator for successive addition in order to provide buoyancy to reduce the weight of the drill vibrate during drilling. It is configured using a drill pipe with a float attached to it.

[Operation] Drill pipe with float is added as drilling progresses. When each drill vibrator is immersed in the water inside the drilled hole, the float gives it buoyancy and reduces its own weight. As a result, the weight of the entire drill pipe does not increase even if many drill vibes are added, and it can be sufficiently supported by the support device on the ground.

[Implementation Example 1] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, which is an air-lift type vertical hole boring machine, which is connected to a cutter 1 and can be successively added so that the cutter 1 can dig while descending under its own weight. A float 12 is formed on the outer periphery of a certain drill vibrator 3 by fixing a cylindrical front part of a required diameter by welding so as to form a ring-shaped space to prevent water from entering inside. The floats 11 are attached to all of the drill vibes 3 in the number necessary to reach a deep depth of 1000 m. For example, if the diameter of the drill vibe 3 is 500+nn+, the diameter of the float 11 attached to each drill vibe 3 is about 1500 mm. Also, the buoyancy of the float 11 is to reduce the weight of the drill vibe 3, and it can be used underwater. It goes without saying that the size should not be such as to prevent the drill vibe 3 from descending under its own weight.

Reference numeral 13 denotes a stabilizer attached to the outer circumference of the cutter 1, which slides along the inner wall surface of the hole 11 drilled by the cutter 1 to guide the cutter 1 smoothly.

Components that are the same as those shown in FIG. 2 for others are given the same reference numerals.

The illustrated state shows that drilling is progressing to the required depth, and multiple drill vibes 3 are added and connected to the upper end of the cutter 1, and the cutter continues until the next drill vibe 3 is added. 1 and each drill vibe 3 excavate under their own weight, and when the depth of 3 minutes of the drill pipe is excavated, the next drill vibe is added and the excavation is continued one by one.

When the position of the cutter bit 2 reaches a depth of 1000m from the ground, the number of drill vibes 3 to be added becomes enormous, but each drill vibe 3 has a float 1.
2 are individually attached, so in the water that flows back into the drilling hole 11, the weight of each individual drill vibe 3 becomes lighter due to the buoyancy acting on each float 12, and the total weight of all the drill vibes and cutter 1 becomes lighter. It also becomes lighter in water. As a result, it is not an unreasonable load to support on the ground, and it can be safely supported, and it is possible to poll to a deep depth of 1000 a+ by excavating with its own weight.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but includes, for example, all drill vibes 3 that are used in addition.
Instead of attaching the float 12 to the float 12, it is possible to increase the buoyancy of the float and use a drill vibe without a float for every appropriate number of floats.Also, although the case of the air lift method is shown, it is also possible to use the pump suction method. Of course, it can also be applied in the same way.

[Effects of the Invention] As described above, according to the present invention, the drill vibe itself is equipped with a float to give it buoyancy in water during drilling, so it is possible to add many drill vibes. However, the entire weight is balanced by buoyancy, allowing the boring machine to be supported from the ground without any problems.
The excellent effect of being able to easily and safely perform deep excavation reaching up to 00a+ can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing an embodiment of the present invention, and FIG. 2 is a side view of a conventional air lift type boring machine. 1 is a cutter, 2 is a cutter pit, 3 is a drill vibe, 6 is a lifting crane, 11 is a heavy duty, and 12 is a float. Gu~ ~

Claims (1)

[Claims] 1) In a vertical hole boring machine that uses its own weight to drill a vertical hole while sequentially connecting a drill pipe to the upper end of a cutter that has a cutter bit at the lower end, the outside of the drill pipe that is used by sequentially connecting the drill pipe is A vertical hole boring machine characterized by having a float attached to exert buoyancy on the drill pipe.