JPH0693794A - Underwater excavation device - Google Patents

Abstract

PURPOSE:To exhaust all muck including stones, etc., produced from pit excavating works smoothly only with an air lift by allowing a pair of rotary drum cutters to pinch such stones left at the bottom of a pit being excavated or large lumps of marine ground, and thereby crushing into smaller pieces. CONSTITUTION:The body 3 of an underwater pit excavating machine is passed through a steel pipe pile 8, hung down from the top, and fixed to the inner wall of the pipe pile 8 using a gripper 16. A pair of drum cutters 24, 24 are revolved round the axis of a pit excavated by a hydraulic motor 18 and a speed reduction gear 19 for revolutions through a revolving inner cylinder 17, revolving support member 4, and swing arm 5 and are rotated in the opposite directions to each other by an oil pressure pump installed on the swing arm 5. Accordingly stones, etc., produced from the excavation works are hitched by a pick 24c, nipped by the cutters 24, 24, crushed into smaller pieces, sucked into a muck suction part 31 through the action of an air lift together with the excavation muck, and exhausted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an underwater drilling device for a vertical hole used for a vertical hole excavation work when a foundation of a bridge or a jetty is constructed on the seabed or waterbed, and in particular, a cobblestone generated by the excavation work, etc. The present invention relates to a submersible excavator for a vertical hole, which is crushed finely by a pair of polygonal rotary drum cutters and discharged by an air lift together with excavation slip.

[0002]

2. Description of the Related Art Conventionally, when constructing a foundation for a bridge or jetty on the seabed or waterbed, a steel pipe pile (casing pipe) is driven into a relatively soft stratum with a hydraulic hammer or the like to form a relatively hard rock layer at the tip of the steel pipe pile. After reaching, the steel pipe pile is excavated and the relatively hard bedrock layer under the steel pipe pile is also excavated, and concrete is poured into the pit to consolidate the steel pipe pile and the rock mass. There is. As a pit excavator for excavating the pit, an earth auger, a pit underwater excavator, or the like is used.

As shown in FIG. 6, the conventional underwater excavator disclosed in Japanese Utility Model Publication No. 4-17661 comprises a support frame 1 and a turning drive device 2 fixed to the support frame 1. A swivel support member 4 swiveled by the swivel drive device 2 is attached to a lower portion of the excavator main body 3, and an upper end portion of a swing arm 5 having a swing hydraulic cylinder built therein is attached to the swivel support member 4 by a horizontal axis. A single drum cutter 6 which is mounted and is rotated by a drive device is mounted below the swing arm 5, and the swivel support member 4 and the intermediate portion of the upper arm of the swing arm 5 are arm swing hydraulic cylinders. The underwater excavator A for vertical holes is configured by being connected via 7 and the underwater excavator A configured in this way is suspended and supported by a leader of a pile driving ship so as to be able to move up and down via a wire rope.

In the above-mentioned underwater excavator, the steel pipe pile 8 is supported by a leader of a pile driving ship, and the underwater excavator A for vertical hole is suspended in the steel pipe pile 8 by a wire rope to the submarine ground 9. The single-drum cutter 6 is swung around the center line of the vertical hole 10 by the swivel driving device 2 via the swivel support member 4 and the swing arm 5, and the single-drum cutter 6 is rotated. While excavating the seabed 9 by the underwater excavator A for vertical holes, compressed air from a compressor (not shown) is supplied to the lower part of the sludge pipe vertical pipe 11 through the air supply pipe, and the drain pipe vertical pipe 11
A water flow containing air bubbles is generated inside, and the water flow causes the vertical holes 10
Sludge excavated by the single-drum cutter 6 at the bottom of the inside, that is, muddy water composed of water and water in the vertical hole 10, is sucked from the suction port 31a by the air lift pump, and the mound passes through the mud pipe 11 to transport the sand and sand. Is discharged to.
The excavated slag is settled by a sediment carrier, only the muddy water is pumped by an underwater pump, returned to the steel pipe pile 8 by the water supply pipe, and the water for air lift is circulated.

[0005]

However, in the above-mentioned conventional underwater excavator having a single-drum cutter, although the excavation gap of the vertical hole is discharged by the air lift action, the submarine ground under the steel pipe pile is excavated. Depending on the type, it may contain a large number of large and small boulders, and if it is a certain size or more, even if it enters the suction pipe, it will not be discharged smoothly due to the air lift action and the suction pipe will be clogged, and it will not be possible to discharge the excavation chips. Also, if there are cobblestones that are larger than the inner diameter of the suction pipe, or if the seabed is shaving with a drum cutter and a large crack occurs, it cannot be crushed with a conventional single-drum cutter, so the suction pipe cannot be crushed. There was a drawback that it would not be sucked into the inside and would roll at the bottom of the drilling hole, obstructing the drilling work and lowering the drilling efficiency. If the suction pipe is clogged or broken due to large or small boulders or large cracks in the seabed, the submersible excavator is once pulled up to the water to clean the inside of the suction pipe. There was also the problem of having to repair the tip portion of the suction.

The present invention has been made in view of the above circumstances, and includes a pair of rotating drum cutters for a cobblestone rolling at the bottom of a pit caused by pit excavation work and a large crack in the seabed ground. It is an object of the present invention to provide an underwater excavation device configured to be sandwiched between them and finely crushed, and which can be smoothly discharged together with excavation slip by an air lift.

[0007]

In order to achieve the above object, the present invention enables a submersible excavator body suspended from the water through a steel pipe pile to be detachably attached to the inner wall of the steel pipe pile. An underwater excavation device comprising a gripper for fixing, and an excavation unit swingably provided by a swing arm on a swivel support member of a swivel inner cylinder in the underwater excavator body, wherein the excavation unit is driven by one hydraulic motor. It is composed of a pair of driven rotary drum cutters with polygonal shape, and the slip suction tip of the sludge pipe is exposed near the middle of the pair of rotary drum cutters. And a pair of rotating drum cutters each having a hexagonal drum cutter body fixed with a number of picks and configured to rotate in mutually opposite directions. In addition, by connecting a compressed air supply pipe to a mud discharge pipe in the body of the underwater excavator, the excavation chips crushed by a pair of polygonal rotary drum cutters are sucked in from the tip end. The feature is that it is configured to be discharged by an air lift through the mud pipe.

[0008]

Next, the operation of the present invention will be described. An underwater excavator body for pits is suspended from above through a steel pipe pile, and the underwater excavator body is fixed to the inner wall of the steel pipe pile by a gripper. A pair of rotating drum cutters are integrally swiveled around the center line of the vertical hole at the tip of the steel pipe pile by the swiveling drive device provided in the body of the underwater excavator via the supporting member of the swiveling inner cylinder and the swing arm. At the same time, the two rotary drum cutters are also rotated in the opposite directions by one hydraulic motor. At this time, since the upper arm of the swing arm is connected to the intermediate portion of the upper arm via the arm swing hydraulic cylinder, the rotary drum cutter can swing at an angle within a certain range. In this way, the earth and sand excavated by the pair of rotary drum cutters, that is, the muddy water made up of the excavation scrap and the water in the pit, generates a water flow containing bubbles in the discharge pipe by the compressed air of the compressor installed above the water. Therefore, it is sucked up by the air lift action and discharged to the outside.

The boulders and large cracked lumps that are generated by the pit excavation work of this underwater excavator and are rolling on the bottom of the pit,
Since the pair of rotary drum cutters are rotating in opposite directions, they are caught by the picks fixed to the respective rotary drum cutters, and are sandwiched between the two rotary drum cutters to form the polygonal shape. It is finely crushed between the corner of the drum cutter body and the side of the opponent, or between the side of the drum cutter body and the pick of the opponent. In this way, at the same time as the work of digging the bottom of the pit, even a cobblestone or a large crushed lump is finely crushed by the pair of rotary drum cutters, and all the slips generated by the digging work are easily sucked up by the air lift and discharged to the outside. It

[0010]

Embodiments of the present invention will now be described with reference to the drawings. 1 to 5 show an embodiment of the present invention, in which the same or equivalent parts as those of the above-mentioned conventional example are designated by the same reference numerals, and detailed description thereof will be omitted. As shown in FIG. 1, the underwater excavator A for vertical holes of the present embodiment has a steel pipe pile 8
Is supported by the leader 14 of the pile driving ship 12, and the underwater excavator A for vertical hole is suspended in the steel pipe pile 8 by the wire rope 15 to the seabed 9. The underwater excavator A for pit has two upper and lower grippers 16 for detachably fixing the excavator body 3 to the inner wall of the steel pipe pile 8, and the excavator body 3 has an inner cylinder 17 thereof. A hydraulic motor 18 for turning drive and a speed reducer 19 for turning are provided, and an output gear 20 of the speed reducer 19 for turning is meshed with a gear 21 fixedly provided on the upper portion of the inner cylinder 17. On the other hand, this inner cylinder 1
A swivel support member 4 is attached to the lower end of 7,
An upper end portion of a swing arm 5 having an arm swing hydraulic cylinder 7 built in the swing support member 4 is pivotally attached by a horizontal shaft 5a, and the swing arm 5 has an excavation portion 2 with respect to the swing support member 4.
4 is swingably provided.

As shown in FIG. 3, the swing arm 5 is provided with a pair of drum cutters 24, 24 which are rotated in opposite directions by a drive unit composed of a hydraulic pump 22 and a gear unit 23. . Therefore, the inner cylinder 1 is driven by the driving force of the hydraulic motor 18 provided in the excavator body 3.
7, the double drum cutter 24 is swung around the center line of the vertical hole 10 via the swing support member 4 and the swing arm 5, and the double drum cutter 24 is driven by the driving force of the hydraulic pump 22 of the swing arm 5. They are rotated in opposite directions.

Next, the excavation section will be described in more detail with reference to FIGS. 4 and 5. Gears 23a fixed to the output shaft of the hydraulic pump 22 provided on the swing arm 5 are respectively paired with intermediate gears. Gears 23b fixed to the respective rotary shafts 24a, 24a of the drum cutters 24, 24,
23b, the two drum cutters 24, 24 are rotated in opposite directions by the driving force of the hydraulic pump 22. This drum cutter 24 has a pick or bit 24c on the surface of a hexagonal drum cutter body 24b.
It is configured by fixing a large number of. In the middle of the two drum cutters 24, 24, a tip opening 31a of a sludge suction part 31 for sludge, which is communicated with a lower end of the inner cylinder 17 of the excavator body 3 by a flexible tube, is provided. There is.

In the pit excavation work by the underwater excavator A of this embodiment, the pit underwater excavator body 3 is suspended from above by the wire rope 15 through the steel pipe pile 8, and the underwater excavator body 3 is then suspended. On the inner wall of the steel pipe pile 8 with a gripper 1
After being fixed by 6, the arm swinging hydraulic cylinder 7
Is operated to adjust the angle of the excavation section, and then the swivel inner cylinder 17, the swivel support member 4, and the swivel support member 4 are provided by the swivel drive device including the hydraulic motor 18 and the swivel reducer 19 provided in the underwater excavator body 3.
The two rotary drum cutters 24, 24 that rotate via the swing arm 5 are integrally swiveled around the center line of the vertical hole 10 at the tip of the steel pipe pile 8 to perform excavation. The cobbles and large lumps generated by the rotary excavation of the two drum cutters 24, 24 and rolling on the bottom of the pit 10 have the two rotary drum cutters 24, 24 rotating in opposite directions. Is caught by the picks 24c fixed to the respective rotary drum cutters 24 and sandwiched between the two rotary drum cutters 24, 24, and the corner 24d of the polygonal drum cutter body 24b and the other And the side 24e of the drum cutter body 24b and the pick 24c of the opponent. As described above, at the same time when the bottom of the pit 10 is excavated, boulders and large cracks are also finely crushed by the pair of rotary drum cutters, resulting in fine misalignment.

On the other hand, the compressed air from the compressor 25 installed on the pile driving ship 12 is supplied to the compressed air supply port 27 provided at the lower portion of the excavator body 3 through the steel pipe pile 8 by the air supply pipe 26. The compressed air supply port 27 of the excavator body 3 is provided with an air hole 28 penetrating the excavator body 3 and a groove 29 in the circumferential direction. Compressed air from the compressor 25 is supplied to a plurality of small holes 30 formed in a plurality of directions, is ejected into the inner cylinder 17 to cause an air lift action, and is finely crushed by a pair of rotary drum cutters to form fine cobblestones. Along with the excavation gap, the air-lifting action facilitates easy suction from the tip opening 31a of the sludge suction part 31 for sludge discharge, and a sludge vertical pipe 32 that communicates with the upper part of the inner cylinder 17 and above it. Through the mud hose 32a it is discharged into the sediment carrier 33.

According to the above-described embodiment, the compressed air from the compressor 25 on the pile driver 12 passes through the air supply pipe 26 of the excavator main body 3 while excavating the seabed 9 by the underwater excavator A for pit. It is supplied to the lower part of the inner cylinder 17, and a water flow containing bubbles is generated in the inner cylinder 17, and the water flow excavates the sand and sand excavated by the double drum cutter 24 at the bottom of the vertical hole 10, that is, the double drum cutter 24. The muddy water, which consists of excavated scraps including boulders and the like that have been finely crushed into fine scraps and the water in the vertical hole 10, is sucked by the air lift pump action from the tip suction port 31a of the slip suction part 31, and these scraps are It is discharged to the sediment carrier 33 through the sludge vertical pipe 32 and the mud hose 32a which are communicated with the upper part of the cylinder 17. In the earth and sand carrier 33, the excavation sludge 34 is settled, and only the muddy water 35 is pumped by the submersible pump 36.
The water supply pipe 37 is used to return the steel pipe pile 8 into the steel pipe pile 8 and circulate the water for air lift.

[0016]

As described above, according to the present invention, a rotary drum cutter having a large number of picks fixed to a pair of polygons driven by one hydraulic motor so as to rotate the excavation parts in opposite directions. It is composed of a pair of rotary drum cutters, and the slip suction tip of the sludge pipe is exposed near the middle of the rotary drum cutter. The cobblestones and lumps in the sedimentary layer are also caught by the picks fixed to the rotating drum cutters, and are sandwiched between the two rotating drum cutters in the opposite directions to form a polygonal drum cutter. Since it is finely crushed between the corner of the main body and the side of the opponent, the side of the drum cutter main body and the pick of the opponent, etc. Can be discharged to the outside easily sucked up by the use. Therefore, there is an effect that all the scraps including boulders generated by the excavation work can be sucked up only by the air lift and easily discharged to the outside.

[Brief description of drawings]

FIG. 1 is an overall explanatory diagram of the present embodiment.

FIG. 2 is a cross-sectional explanatory view of the underwater excavator body of the present embodiment.

FIG. 3 is a side view of an excavation unit of this embodiment.

FIG. 4 is a partial cross-sectional explanatory view of two rotary drum cutters according to the present embodiment.

FIG. 5 is a bottom view illustrating two rotary drum cutters according to the present exemplary embodiment.

FIG. 6 is a side view of a conventional underwater excavator body.

[Explanation of symbols]

 3 Excavator Main Body 4 Swiveling Support Member 5 Swing Arm 7 Arm Cylinder Hydraulic Cylinder 8 Steel Pipe Pile 9 Seabed Ground 10 Vertical Hole 12 Pile Driving Ship 14 Reader 15 Wire Rope 16 Gripper 17 Inner Cylinder of Excavator Main Body 18 Hydraulic Motor 19 Rotating speed reducer 20 Output gear 21 Gear 22 Hydraulic pump 23 Gear device 24 Drum cutter 24b Drum cutter body 24c Pick 25 Compressor 26 Air supply pipe 27 Compressed air supply port 28 Air hole 29 Groove 30 Small hole 31 Sludge suction part 32 Discharge vertical Pipe 33 Sediment carrier 34 Drilling scrap 35 Mud 36 Submersible pump 37 Water supply pipe A Underwater excavator for pit

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Hideyuki Moriyama 4-1-1 Koraibashi, Chuo-ku, Osaka City, Osaka Prefecture Toyo Construction Co., Ltd. (72) Shigeki Sugihara 4-1-1 Koraibashi, Chuo-ku, Osaka City, Osaka Prefecture No. 1 Toyo Construction Co., Ltd. (72) Inventor Hiroyuki Ito 2-28 Asahi-cho, Omuta-shi, Fukuoka Stock company Mitsui Miike Works Miike Works (72) Inventor Toshihiro Yoshida 2-28 Asahi-cho, Omuta-shi, Fukuoka Stock company Mitsui Miike Works Miike Plant

Claims (3)

[Claims] 1. An underwater excavator main body suspended from above the water through a steel pipe pile, and a gripper for detachably fixing the underwater excavator main body to an inner wall of the steel pipe pile. In an underwater excavation device in which a swivel support member of a possible inner cylinder is provided with an excavating portion swingable by a swinging arm, the excavating portion comprises a pair of polygonal rotary drum cutters driven by one hydraulic motor. An underwater excavation device, characterized in that a slip suction tip of a mud pipe is exposed near the middle of the pair of rotary drum cutters, and the mud pipe is communicated from above the underwater excavator body to the outside. 2. The underwater according to claim 1, wherein each of the pair of rotary drum cutters is configured such that a large number of picks are fixed to a hexagonal drum cutter body and are rotated in opposite directions. Drilling equipment. 3. A sludge suction pipe from a tip of the submersible excavator body is provided with a compressed air feed pipe for communicating the compressed air feed pipe with a pair of polygonal rotary drum cutters. The underwater excavation device according to claim 1 or 2, wherein the underwater excavation device is configured to be discharged by an air lift.