JP2962690B2 - Rock excavation method using guide poles installed on offshore workbench - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rock excavation method using a guide pole installed on an offshore workbench.

[0002]

2. Description of the Related Art Conventionally, rock excavation on the seabed such as rock excavation of a pier foundation caisson installation portion in an ocean bridge project has been conventionally performed.
Mainly, (1) method using crushed rock rods and grab buckets (2) method using pneumatically or hydraulically crushed chisel and grab buckets (3) method using lap excavation of rotary hard rock excavator, etc.

[0003] (1) A heavy rock rod suspended by a crane on a ship is repeatedly dropped on rock to be excavated, the rock is crushed by the impact force, and the rock is suspended by a grab bucket similarly suspended. How to excavate.

According to this method, mooring of a work boat equipped with a crushed rock rod or a grab bucket is impossible in a sea area with a fast tide or a sea area receiving a very long cycle wave. Or the grab bucket is swept under the influence of the tidal current, or the workboat shakes greatly, so that the crushed rock position, excavation position or depth cannot be determined, or when the work position is changed, the entire workboat must be moved. And the need to wait until the wave conditions improve. In addition, a plan has been considered in which a similar work apparatus is mounted on a work table fixed to the sea floor, such as an offshore worktable (hereinafter referred to as “SEP”), and similar devices are sequentially moved on the SEP. Is heavy due to SEP
There was a problem with the mounting capacity of

[0005] (2) is a method in which a crushed rock chisel by air or hydraulic is suspended by a crane on board to perform crushed rock, and then excavated by a grab bucket.

[0006] This method can be mounted on an SEP because the weight of the entire apparatus is not as large as (1).
(1) Similarly, if the location of the crushed rock, excavation position or depth is not determined due to the influence of the tidal current, and if the rock slopes during crushed rock, etc., the horizontal force acts on the chisel body, and the chisel shakes greatly, making the work difficult. There were problems that were impossible.

[0007] (3) A guide pipe in which a rotary hard rock excavator is set is supported by a traveling cart on the SEP and an underwater elevator installed underwater from the SEP.
In this method, lap excavation is sequentially performed while repeating excavation and movement of a guide pipe.

In this method, when the SEP and the underwater elevator are installed, the excavation work can be performed continuously without being affected by the tidal current, accurate excavation can be performed, and the discharge of excavated waste simultaneously with excavation. There are merits such as being possible. However, the equipment is large and costly, the underwater elevator must be set up quickly when the tidal current is small, the round lap excavation causes loss of construction efficiency, and the rotary Since it is a type excavation, there were problems such as a long excavation time.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional method, and the whole apparatus is simple and light in weight, can be sufficiently mounted on the SEP, and can be installed on the seabed of the apparatus. It is an object of the present invention to provide a rock excavation method that can be easily and speedily set.

Further, the present invention also provides a rock excavation method capable of performing an accurate excavation operation without being affected by a tidal current, requiring very little lap excavation, and having a high construction efficiency. It is the purpose.

It is a further object of the present invention to enable a rock crushing device equipped with rock crushing rods to perform a rock crushing operation with high positional accuracy even when a rock that cannot be excavated is interposed by a road head. .

[0012]

According to the present invention, an offshore workbench is mounted on a submarine ground, and a guide pole grasping device installed on a movable trolley from the marine worktable itself traverses the movable trolley. Through, the guide pole is pressed against the undersea ground, and the guide pole is used as a guide, and the underwater gantry equipped with the grasping device and capable of turning and extending and contracting to a predetermined depth in the sea is mounted on the gantry of the guide pole grasping device. The underwater gantry is fixed to the guide pole by operating the grasping device for the underwater gantry, and the twin-drum road header mounted at the end of the horizontal telescopic frame of the underwater gantry is vertically extended and contracted, and the underwater gantry is It is moved by turning and expanding and contracting in the horizontal direction to excavate the seabed ground in a fan shape, and when the fan-shaped excavation is completed, the vertical of the twin drum road header is vertical. Shortening the direction of the frame, said guide pole to edge cutting from seabed, until the next fan-shaped drilling position,
The twin-drum road header is moved by the traveling of the movable trolley or the traverse of the guide pole grasping device, and the fan-shaped excavation is performed.

In the case where a rock that cannot be excavated is interposed by the road header, a rock crushing device equipped with a hydraulic hammer-type rock crushing rod is attached to the end of the horizontal telescopic frame of the underwater mount instead of the road header to perform the rock crushing work.

Depending on the condition of the rock on the seabed, a bit may be attached to the tip of the guide pole, and the rock may be cut with the bit by a rotary pushing device built in the guide pole grasping device to insert the guide pole into the rock. To

The excavation waste is suctioned by an air lift from an excavation waste suction port installed near the road header drum, and is discharged via an offshore worktable, and is processed and stocked on an offshore worktable.

The entire apparatus is simple, light in weight, and can be sufficiently mounted on an offshore workbench, so that the apparatus can be easily and quickly set on the seabed.

Further, since the apparatus is set on a marine work table and a guide pole supported on the seabed, the apparatus is not affected by the tidal current, and can perform excavation work with high accuracy.

The excavating speed is higher than that of a rotary excavator, and lap excavation is very small, so that the construction efficiency is good.

Further, even when a rock that cannot be excavated is interposed by the road header, a rock crushing device equipped with a hydraulic hammer-type rock crushing rod can be mounted instead of the road header.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, an offshore work platform (hereinafter referred to as "SEP") 1 is installed on a submarine ground T, and the SEP 1 on which installation has been completed is installed on a mobile vehicle 2 itself. The guide pole 4 is passed through the guide pole grasping device 3 (also used as a trolley) that traverses on
Is pressed against the seabed T. Depending on the condition of the seabed,
In some cases, a bit is attached to the tip of the guide pole, and the rock is cut into a ring with the bit to insert the guide pole into the rock using a rotary pushing device built in the guide pole grasping device.

Using the guide pole 4 as a guide, the underwater gantry 5 equipped with a grasping device and capable of turning and extending and retracting to a predetermined depth in the sea is moved up and down by the underwater gantry winch 6 mounted on the gantry of the guide pole grasping device 3. The underwater gantry 5 is suspended by the wire 7, and the underwater gantry 5 is fixed to the guide pole 4 by operating a grasping device thereof.

In FIG. 1 and FIG. 2, the underwater gantry 5 receives a hydraulic pressure from a hydraulic unit installed on the gantry of the guide pole grasping device 3 and grasps the guide pole 4 in the sea (not shown). ), A telescoping device (not shown) for expanding and contracting the frame 8 in the horizontal direction, and a revolving device (slewing cylinder) 9 for revolving the horizontal telescopic frame 8
And In the illustrated example, the horizontal telescopic frame 8 turns ± 30 degrees, but the turning angle can be freely set.

At the end of the horizontal telescopic frame 8, a twin-drum load header 11 that can be vertically extended and contracted by a vertical telescopic frame 10 is provided. By using a twin drum, as shown in FIG. 5, each of the drum cutters 11A and 11B is rotated in the reverse
Excavation reaction force other than the axial direction and the vertical direction can be canceled as much as possible. In FIG. 5, the arrow indicates the moving direction.

Next, a mode of excavating the seabed by the above-described apparatus will be described. Twin drum road header 11
Is expanded and contracted in the vertical direction, and is moved by turning the horizontal telescopic frame 8 (the underwater gantry 5) and expanding and contracting in the horizontal direction,
Excavate the seabed ground in a fan shape. FIG. 6 shows one excavation capacity A. Excavation scraps are loaded on the road header drums 11A and 11B.
Air is sucked from an excavating chisel suction port 12 installed in the vicinity through an air lift mud feed hose 13 by an air lift, and SEP
Discharge via 1 above. Further, it is also possible to perform a shearing process and stock on the SEP1.

When the fan-shaped excavation is completed, the vertical frame 10 of the twin drum road header 11 is contracted, the guide pole 4 is cut off from the seabed, and the traveling of the movable carriage 2 or the guide pole is moved to the next fan-shaped excavation position. Grasping device 3
The twin-drum road header 11 is moved by the traversing of and the fan-shaped excavation is performed. By repeating this, a wide range of plane excavation can be performed. FIG. 7 shows an example of the excavation pattern, which sequentially moves in the directions of arrow 1, arrow 2, and arrow 3,
A, B ... fan-shaped excavation.

When a rock that cannot be excavated is interposed by the road header, as shown in FIGS. 3 and 4, a hydraulic hammer type rock crushing rod is provided at the tip of the horizontal telescopic frame 8 of the underwater mount 5 instead of the road header. Attach the rock breaking device 14
Work on crushed rock. 15 is a crushed rock bar, 16 is a hydraulic hammer, 17
Indicates a hydraulic hose. The crushed rock area is fan-shaped for each installation position of the guide pole, as in excavation.

[0027]

According to the present invention, the whole apparatus is simple and in terms of weight, much lighter and less expensive than the method using crushed rock bars and grab buckets or the method using lap excavation of a rotary hard rock excavator. , And SEP, and the device can be easily and quickly set on the seabed.

Further, since the apparatus is set on the guide pole supported by the SEP and the seafloor ground, it is not affected by the tidal current, so that a precise excavation operation can be performed.

In addition, the excavation speed is higher than that of a rotary excavator, and lap excavation can be performed very little, so that the construction efficiency is good. However, the operation rate can be greatly increased by stocking excavated waste on the SEP.

Further, by increasing the turning angle of the apparatus and the expansion and contraction stroke of each frame, it is possible to further improve the construction efficiency.

When a rock that cannot be excavated is interposed by the road header and a hydraulic hammer-type rock crushing rod is installed, the reference position is fixed by an underwater gantry equipped with a guide pole and a grasping device, so that the position accuracy is reduced. It is possible to perform a good rock crushing operation and to cope with the horizontal force received from a rock crushing rod during rock crushing.

Further, since the crushed rock energy source is set near the seabed, the energy loss is small, and the hitting energy and the number of hits per unit time can be variably set according to the properties of the rock.

[Brief description of the drawings]

FIG. 1 is a front view of a rock excavator using a guide pole installed in an SEP when a twin drum road header is attached to an underwater mount.

FIG. 2 is a view taken along the line AA of FIG. 1;

FIG. 3 is a front view of the device when a hydraulic hammer-type rock crushing rod is attached to the underwater mount.

FIG. 4 is a view taken in the direction of arrows AA in FIG. 3;

FIG. 5 is an explanatory view showing an excavation mode of a twin drum road header.

FIG. 6 is an explanatory diagram showing one excavation capacity.

FIG. 7 is a diagram showing an example of an excavation pattern.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Offshore work table 2 ... Moving trolley 3 ... Guide pole grasping device 4 ... Guide pole 5 ... Underwater mount 6 ... Underwater mount elevating winch 7 ... Underwater mount elevating wire 8 ... Horizontal telescopic frame 9 ... Rotating cylinder 10 ... Vertical telescopic frame 11 ... Twin drum load header 12 ... Excavation shear suction port 13 ... Air lift mud feeding hose 14 ... Rock breaking device 15 ... crushed rock bar 16 ... hydraulic hammer 17 ... hydraulic hose

Claims (5)

(57) [Claims] Claims: 1. An offshore workbench is mounted on a submarine ground, and the guidepole is pressed from the offshore workbench to the undersea ground through a guide pole grasping device installed on a mobile trolley and traversing the mobile trolley itself. Using the guide pole as a guide, the underwater gantry equipped with a grasping device and capable of turning and expanding and contracting is suspended to a predetermined depth in the sea by a winch for raising and lowering the underwater gantry mounted on the gantry of the guide pole grasping device. Activating the grasping device and fixing it to the guide pole, the twin-drum load header equipped at the tip of the horizontal telescopic frame of the underwater gantry is expanded and contracted in the vertical direction, and moved by turning and horizontal expansion and contraction of the underwater gantry. When the submarine ground is excavated in a fan shape, and when the fan-shaped excavation is completed, the vertical frame of the twin drum road header is contracted, and the guide The pole is cut off from the seabed, and the twin-drum road header is moved by running the movable truck or traversing the guide pole grasping device until the next fan-shaped excavation position, and the fan-shaped excavation is performed. A rock excavation method using a guide pole installed on an offshore work bench, characterized by excavation. 2. The offshore workbench according to claim 1, wherein the excavation waste is suctioned by an airlift from an excavation waste suction port installed near the load head drum, and is discharged via an offshore workbench. Rock excavation method using the installed guide pole. 3. The offshore work platform according to claim 1, wherein the excavation waste is sucked by an air lift from an excavation waste suction port installed near the load head drum, and the offshore work table is processed and stocked on the offshore work platform. Rock excavation method using guide poles installed in the area. 4. A marine work platform is mounted on the submarine ground, and the guide pole is pressed from the marine work platform to the submarine ground through a guide pole grasping device installed on the mobile trolley, which itself traverses the mobile trolley. Using the guide pole as a guide, a submersible gantry equipped with a grasping device and capable of turning and extending and retracting is suspended to a predetermined depth in the sea by a winch for raising and lowering the underwater gantry mounted on the gantry of the guide pole grasping device. A guide installed on a marine work bench, characterized in that rocking work is carried out by a rock crushing device equipped with a hydraulic hammer type rock crushing rod attached to the end of a horizontal telescopic frame of an underwater gantry by actuating a grasping device and fixing the guide pole. Rock excavation method using poles. 5. A bit is attached to the tip of the guide pole,
5. The guide pole installed on a marine work platform according to claim 1, wherein the rock is ring-cut with the bit and the guide pole is inserted into the rock by a rotary pushing device built in the guide pole grasping device. Rock excavation method using the.