JPH066863B2 - Deep rock drilling equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention has a bedrock layer as a foundation ground several tens of meters below in the construction of a continuous underground wall, and is a large tool for excavating this bedrock layer. Depth rock drilling equipment.

[Conventional technology]

It goes without saying that the deeper the drill hole is, the more likely it is for core misalignment during drilling, but for relatively soft ordinary ground, insert a rotary continuous drilling type drilling device such as an earth auger into the ground without eccentricity. Various methods have been proposed. For example, in the case of forming a groove-like hole while partially wrapping an excavation hole, a guide is built in the already formed hole, a steady rest is attached to this guide so that it can move up and down, and the auger is used with this holder. One example is to keep the screw from bending.

[Problems to be Solved by the Invention]

However, the rock layer is very hard, unlike ordinary ground,
In order to drill this, a special rotary continuous excavator that can give a sufficient rotary torque and is excellent in cutting ability is required.

Conventionally, as an example of a deep rock bed excavation device, JP-A-60-
There is one described in Japanese Patent No. 126489.

According to this Japanese Laid-Open Patent Publication No. 60-126489, a kelly rod in which a plurality of hollow rod bodies having different diameters are inserted and extendably connected to each other, and a part of this kelly rod is slidable. An excavation device is described which consists of a gripping rotary head.

However, the range where the rotary head grips the kelly rod is limited to the range of the leader mast that suspends the kelly rod from the ground, and the rotary head does not reach underground. Therefore, if the drilling reaches a large depth,
There is a risk of misalignment.

Further, since each rod body constituting the Kelly rod itself is long, it is necessary to strengthen the stem, which results in an expensive material and cost.

As another conventional example, Japanese Patent Laid-Open No. Sho 56-56 relates to a steady rest.
-There is a publication No. 108490.

According to this Japanese Laid-Open Patent Publication No. 56-108490, a protruding portion is provided on the outer periphery in the vicinity of the connecting portion between the auger shaft and the header, and the protruding portion presses into the hole drilled by the header. The raised portion plays the role of a steady rest.

However, since the protruding portion of Japanese Patent Laid-Open No. 56-108490 is fixed near the header, the protruding portion also moves along with the drilling, and the rod is too long, so it is short. The steady rest may not support the whole body and may become eccentric.

The object of the present invention is to eliminate the inconvenience of the above-mentioned conventional example, to accurately excavate a rock layer at a large depth without misalignment, and the excavator used for this is one used for excavation of conventional ordinary ground. (EN) Provided is a deep rock drilling device which can be used and can be realized at low cost without requiring a special drive mechanism.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention connects an excavator that inserts into the ground while gripping and rotating the casing, and a rod having a diameter smaller than that of the casing connected to the tip of the casing gripped by the excavator, and further In a deep rock drilling equipment that connects rock drilling means consisting of a specially shaped earth auger with a large number of cutter bits aligned downwardly on the tip of the rod on the tip of the screw shaft, the rod of small diameter can rotate and slide. A horizontal jack is housed in a flat housing having a through hole that is inserted into the rod, and a push plate to the side of the rod is provided at the tip of this jack to form a steady rest, and the rod and the rock excavating means are connected. The gist is that a locking flange is provided on the outer periphery of the portion so that the steady rest does not lower further.

[Action]

According to the present invention, the casing is rotationally driven by the excavator, and the rock excavating means at the tip of the casing is also rotated and inserted into the rock layer of large depth.

At this time, the steady rest is fixed by pressing a pressing plate and pressing it against the wall of the already formed drill hole in the upper part of the rock layer.

The rod inserted into the through hole at the center of the housing of the steady rest so as to rotate and slide freely descends while being guided by the housing, so that the rock excavating means at the tip of the rod is pushed straight down to make it hard. Even when excavating the ground, misalignment can be prevented.

When the steady rest reaches the tip of the casing, when the jack of the steady rest is contracted and the pressing plate is retracted, the steady rest descends along the rod and is stopped by a locking flange having a diameter larger than that of the rod.

Now that the steady rest is located at the rod tip,
The pressure is fixed again to the wall of the drilled hole, and the drilling operation is repeated.

Moreover, even when the whole apparatus is pulled up after excavation, the steady rest can be locked at the locking flange and pulled up together with the rod.

〔Example〕

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

FIG. 1 is a side view showing an embodiment of a deep rock excavation device of the present invention, in which 1 is an excavator. The excavator 1 can also be used for excavation of ordinary ground, and although not shown in detail, a motor 3, a speed reducer 4 connected to the motor 3, and a casing connected to the speed reducer 4 are used as a driving device 2. The chuck device 5 is provided on the outer circumference, and the speed reducer 4 and the chuck device 5 are doughnut-shaped and have a through hole through which the excavation casing penetrates.

Further, the drive device 2 itself is vertically movably coupled to a base machine having a moving mechanism such as a crawler or a leader of a short leader mast standing on a pedestal having wheels and the like, and has a lifting jack on its side portion.

Reference numeral 6 in the figure denotes a casing to be held by the excavator 1 as described above. A casing-shaped hollow rod 7 having a diameter smaller than this is connected to the end of the casing 6, and a rock excavating means 8 is further attached to the end of the rod 7. Connected. As an example, the casing 6
The diameter of rod 7 is (φ)
It is about 800mm, and the length of rod 7 is about 7,000mm.
As the rock excavating means 8, a special-shaped earth auger in which a large number of cutter bits 8b are arranged in a downward direction on a tip blade of a screw shaft 8a is used.

As shown in FIGS. 2 and 3, the rod 7 of the excavating means 9 including the casing 6, the rod 7 and the rock excavating means 8 has a jack 10b which is horizontal to the rod in a flat rectangular housing 10a. The steadying device 10 is constructed by accommodating the pressure plates 11 arranged on the sides of the housing 10a and attaching the pressing plates 11 to the jack 10b.

A through hole is provided in the center of the housing 10a of the steady rest 10, and the rod 7 is slidably and rotatably inserted into the through hole.

In this way, the steady rest 10 is slidably provided on the outer periphery of the rod 7, but the rock excavating means 8 at the tip of the rod 7 is provided with a locking flange 7a larger in diameter than the rod 7 at the connecting portion. Then, prevent the steady rest 10 from further lowering.

Next, usage and operation will be described.

4 to 6 are side views showing each step of the excavation method using the excavation device of the present invention. First, as shown in FIG.
A groove-like drill hole 13 is formed in the ordinary ground at a depth of about 50 to 70 m from the surface of the ground on which the excavation method is performed by a normal continuous wall construction method.

As an example of the method for forming the drill hole 13, a multi-axis auger may be used, but when the hole diameter is relatively large, the drill casing having the drill blade at the tip is set in the drill machine 1,
The excavator 1 rotates the excavation casing and inserts it into the ground. At the same time, the excavation bucket is hung inside from the top opening of the excavation casing, the earth and sand inside the casing that is cut into a core shape is discharged to the ground to create a circular hole, and the circular hole is sequentially partially wrapped to continue. Drilling hole
Form 13.

Then, the excavator 1 is replaced as it is with the casing 6 of the excavating means 9 of the present invention, and the outer periphery of the excavating means 9 is gripped by the chuck device 5, whereby the cutter bit 8b of the rock excavating means 8 is excavated as shown in FIG. It is hung down to the deepest part of the hole 13, that is, the position where it abuts on the upper end of the rock layer 12.

At that time, the steady rest 10 hangs down to the locking flange 7a with respect to the rod 7, but if the jack 10b is extended and the pressing plate 11 is projected, this is pressed against the hole wall of the excavation hole 13 and shakes. The entire stop device 10 is firmly fixed in the hole 13.

When the motor 3 is started, the chuck device 5 rotates via the speed reducer 4 and the rotational force thereof is transmitted to the casing 6, so that the rock excavating means 8 also rotates.

When the drive device 2 is lowered, the casing 6 and the rock excavating means 8 are also pushed down, and the rock layer 12 is cut by the cutter bit 8b.

At this time, since the rod 7 is guided by the steady rest 10, it is possible to prevent the excavation of the rock layer 12 of the rock excavating means 8 from being misaligned.

If the steady rest 10 reaches the upper end of the rod 7, that is, the lower end of the casing 6, as the excavation proceeds, the pressing plate is pressed.
When the 11 is retracted, the steady rest 10 descends along the rod 7 and stops at the locking flange 7a, so that the pressing plate 11 is again projected and fixed, and the excavation is continued.

Then, after excavating the bedrock layer 12 of a predetermined length, the casing 6 is rotated in the reverse direction to pull up the bedrock excavating means 8, the entire device is moved to the next expected drilling position, and the same procedure is repeated,
A groove having the same width as the upper drill hole 13 is formed in the bedrock layer 12.

The crushed stone of the rock mass 12 that has been cut can be left as it is, and cement can be poured from above to obtain concrete using this as an aggregate at the hole bottom.

〔The invention's effect〕

As described above, in the deep rock excavation device of the present invention, the rod directly above the rock excavation means is guided by the steady rest device for fixing the excavation hole wall as a reaction force for drilling a rock layer at a deep location. Therefore, even if the rock layer is hard, it is possible to excavate as designed without misalignment.

In particular, the steady rest is slidable along the rod between the casing tip and the locking flange, and it does not go down below the fastening flange, so excavation proceeds and the steady rest reaches the casing tip. However, since it naturally descends only by loosening the reaction force to the borehole wall, it is possible to efficiently excavate and lower the steady rest even when excavating to a large depth.

[Brief description of drawings]

FIG. 1 is a side view showing one embodiment of a deep rock excavation device of the present invention, FIG. 2 is a cross-sectional plan view of a steady rest, FIG. 3 is a side view of the same, and FIGS. It is a side view which shows the process of the excavation construction method using an invention apparatus. DESCRIPTION OF SYMBOLS 1 ... Excavator 2 ... Drive device 3 ... Motor 4 ... Speed reducer 5 ... Chuck device 6 ... Casing 7 ... Rod 7a ... Locking flange 8 ... Rock excavating means 8a ... Screw shaft 8b ... Cutter bit 9 ... Excavating means 10 ... Runout Stopper 10a ... Housing 10b ... Jack 11 ... Pressing plate 12 ... Rock layer 13 ... Groove-shaped drill hole

Claims (1)

[Claims] 1. An excavator for gripping a casing and inserting it into the ground while rotating it, a rod having a diameter smaller than the casing is connected to the tip of the casing grasped by the excavator, and a screw is further attached to the tip of the rod. In a deep rock excavation device that connects rock excavation means composed of a specially-shaped earth auger in which a large number of cutter bits are attached to the tip blades of a shaft in a downward direction, a through hole through which the rod having a small diameter is rotatably and slidably inserted. A horizontal jack is housed in a flat housing having, and a steady plate is provided at the tip of this jack by providing a pressing plate to the side of the rod, and at the outer periphery of the connecting portion between the rod and the rock excavating means, A deep rock excavation device having a locking flange projecting so that the steady rest does not lower further.