JPH0650082A - Rod holding mechanism of seabed boring device - Google Patents

Abstract

PURPOSE:To enhance workability with a seabed boring device by providing at the lower end of a guide pipe a slide guide which has at its center a rod holding hole for passing a rod therethrough and whose outer end surface slides along the inner peripheral surface of the guide pipe. CONSTITUTION:To perform the construction work of crushing the rock of the seabed 3, a ship 2 is towed to a work site and a stanchion 21 is lowered to the seabed 3 to set the ship 2 in a predetermined position on the sea, and a mast 4 is suspended to extend the rod 7 of a rock drill 6, and a bit 9 is positioned on the rock of the seabed 3 and drilling is started. A slide guide 11 is lowered to the upper end of the bit 9 because of its weight and holds a rod 7 at the center of a guide pipe 10 so as to reduce play. Then the rod 7 is surely positioned and facilitates counterboring so as to prevent curving of the hole. A seabed boring device can then be used even in the sea where metal corrosion is too intensive to use a centralizer, and workability can be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rod holding mechanism for a seabed drilling device for drilling rocks on the seabed.

[0002]

2. Description of the Related Art Conventionally, in the work of crushing bedrock on the seabed,
A method is used in which the rock on the seabed is perforated by a boring device provided on a barge, and the expansive crushing agent is filled into the hole to crush the rock. This seabed piercing device is inserted into a mast that hangs from a barge on the sea so that its lower end contacts the seabed, a guide shell provided on the mast, a rock drill that moves up and down along the guide shell, and a rock drill. It is composed of a rod that is worn and connected by a sleeve and extends to the seabed, a bit attached to the tip of the rod, and a guide pipe for guiding the rod from the ship to the seabed.

[0003]

Generally, in drilling machines used on land such as crawler drills and jumbo machines, the guide shell is pressed directly against the rock mass during counter boring, and the centralizer at the tip of the guide shell is used to rode. Can be drilled while holding the. However, since the opening / closing mechanism of the centralizer for supporting the rod is inoperative in the sea due to corrosion, the rod is guided to the seabed through the guide pipe in the seabed drilling device. Here, the inner diameter of the guide pipe needs to be larger than the outer diameter of the sleeve so that the sleeve connecting the rods can pass through, and there is a considerable gap between the guide pipe and the rod. Moreover, as shown in FIG. 5, since the lower end surface of the guide pipe is installed at a distance D from the sea floor to some extent so as not to be affected by the unevenness of the rock bed on the sea floor, the bit at the tip of the rod is placed on the rock bed on the sea bed. In the case of landing on rocks and drilling countersunk holes, there is a risk of rattling due to the large amount of rattling and difficulty in countersinking as well as the difficulty of aligning the centers.

The present invention solves the above problems in holding a rod of a submarine drilling device, has a simple structure and is highly durable, and reduces rattling of the rod tip portion to allow the rod to be moved when countersunk. It can be held securely at the drilling position,
An object of the present invention is to provide a rod holding mechanism for a seabed drilling device that improves workability.

[0005]

DISCLOSURE OF THE INVENTION The present invention is directed to a mast which is hung from a barge on the sea so that its lower end is in contact with the seabed, a guide shell provided on the mast, and a rock drill that moves up and down along the guide shell. A submarine piercing device including a rod that is inserted into a rock drill and connected by a sleeve to extend to the seabed, a bit attached to the tip of the rod, and a guide pipe for guiding the rod from the barge to the seabed. At
The above problem is solved by mounting a slide guide, which has a rod holding hole for inserting a rod in the center and an outer end surface of which slides along the inner peripheral surface of the guide pipe, on the lower end portion of the guide pipe. .

[0006]

[Operation] During drilling, the slide guide descends along the guide pipe by its own weight until it reaches the upper end of the bit, and the rod inserted in the rod holding hole is used as the center of the guide pipe even if the rock on the seabed has irregularities. Hold securely together,
Counterbore punching is easily performed to prevent the bits from splashing.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of the overall construction of a seabed drilling device equipped with a rod holding mechanism according to an embodiment of the present invention, FIG. 2 is a side view of a slide guide, and FIG. 3 is a line 3-3 in FIG. FIG. In this seabed piercing device 1, a guide shell 5 is provided on a mast 4 which is hung from a barge 2 so that its lower end is in contact with the seabed 3.
And a rock machine 6 is mounted along the guide shell 5 for moving up and down. The rock drill 6 is equipped with a rod 7 that is connected by a sleeve 8 and extends to the seabed 3. A bit 9 is attached to the tip of the rod 7. A guide pipe 10 is fixed to the mast 4 with a bracket 20 for preventing and guiding the rod 7 from the barge 2 to the seabed 3 by the influence of tidal current.

A slide guide 11 is attached to the lower end of the guide pipe 10. Slide guide 11
As shown in FIG. 2, the outer diameter is smaller than the inner diameter of the guide pipe 10, and the rod holding hole 12 through which the rod 7 is inserted is inserted in the center.
Blades 14 are radially provided to project from the cylindrical body 13 provided with, and the outer end surfaces of the blades 14 slide along the inner peripheral surface of the guide pipe 10. The sliding distance is set to be larger than the separation distance D between the lower end surface of the guide pipe 10 and the seabed 3.

The pontoon 2 is provided with supporting legs 21 for extending and fixing to the seabed 3. When carrying out rock bed crushing work on the seabed, the pontoon 2 is towed to the work site and supported to the seabed 3. Two
Lower 1 and install the berth 2 at a predetermined position on the sea. Then, the mast 4 is suspended until the tip touches the seabed 3, the rod 7 of the rock drill 6 is extended, and the bit 9 is positioned on the rock bed of the seabed 3 to start drilling. At this time, the slide guide 11 descends to the upper end of the bit 9 by its own weight and the rod 7
Is held in the center of the guide pipe 10 to reduce rattling. Therefore, the rod 7 is surely positioned, facilitating countersinking and preventing hole bending.

FIG. 4 is a sectional view showing another embodiment of the slide guide. In this slide guide 11, an annular sliding piece 15 that is in sliding contact with the inner peripheral surface of the guide pipe 10 is attached to the outer ends of the blades 14 to reduce the wear of the blades 14 and improve the durability of the slide guides 11. Reduce the occurrence of rattling.

[0011]

As described above, the rod holding mechanism of the present invention can be used in the sea where the corrosion of the metal is severe and the centralizer cannot be used, and can reliably hold and position the rod when performing seabed drilling work. And it becomes easy to countersink and the workability improves. In addition, it does not require an operation source such as hydraulic / pneumatic pressure and is durable and inexpensive.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of the overall configuration of a seabed drilling device including a rod holding mechanism that is an embodiment of the present invention.

FIG. 2 is a side view of a slide guide.

FIG. 3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a sectional view showing another embodiment of the slide guide.

FIG. 5 is an explanatory view of a lower end portion of a conventional guide pipe.

[Explanation of symbols]

 1 Submarine drilling device 2 Ship 3 Submarine 4 Mast 5 Guide shell 6 Rock drill 7 Rod 8 Sleeve 9 Bit 10 Guide pipe 11 Slide guide 12 Rod holding hole 14 Blade 15 Sliding piece

Claims (1)

[Claims] 1. A mast hanging from a barge on the sea so that its lower end is in contact with the seabed, a guide shell provided on the mast, and a rock drill that moves up and down along the guide shell.
Submarine drilling provided with a rod inserted into the rock drill and connected by a sleeve to extend to the seabed, a bit attached to the tip of the rod, and a guide pipe for guiding the rod from a ship to the seabed. In the device, a slide guide having a rod holding hole for inserting the rod in the center and an outer end surface of which slides along an inner peripheral surface of the guide pipe is attached to a lower end portion of the guide pipe. Rod holding mechanism for submarine drilling equipment.