JPH06280464A - Method and device for inserting an underwater excavator for vertical holes - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a method and an apparatus for inserting an underwater excavator for pits safely and easily together with cables to not only vertical piles but also diagonal piles. . [Construction] An underwater excavator for a vertical hole for suspending an underwater excavator from above water through a concentric steel pipe pile connected to a holding pipe and its lower part, and excavating the deepest part of the steel pipe pile by the underwater excavator. In the insertion method, in order to insert the underwater excavator for a vertical hole into the oblique pile, the underwater excavator for a vertical hole is inserted and held in the holding pipe in a vertical state in advance, and then the holding pipe is After aligning the guide fitting with the guide of the leader of the pile driving ship, pull up the holding pipe to the leader, hold the holding pipe on the leader by the guide fitting, tilt the leader in that state, and then place the holding pipe directly above the oblique pile. After approaching and connecting the inclined holding pipe and the oblique pile, the underwater excavator for vertical holes is inserted into the oblique pile by using the holding pipe as a guide. Insertion method and device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical hole underwater excavator used for vertical hole excavation work when constructing a foundation for a bridge or a jetty on the seabed or waterbed, along with cables for not only vertical piles but also oblique piles. The present invention relates to an insertion method and device that can be inserted.

[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, and the tip of the steel pipe pile is a relatively hard rock layer. After that, the inside of the steel pipe pile is excavated, the relatively hard bedrock layer below the steel pipe pile is also excavated, and concrete is poured into the pit to consolidate the steel pipe pile and the bedrock. ing. As a pit excavator for excavating the pit, an earth auger, a pit underwater excavator, or the like is used.

A conventional underwater excavator for a vertical hole is provided with a supporting frame suspended in a steel pipe pile and a swinging drive unit fixed to the supporting frame. A swing support member that is swung by means of a rotary shaft is mounted on the swing support member. The upper end of a swing arm having a swing hydraulic cylinder is mounted on the swing support member by a horizontal shaft, and is rotated by a drive unit below the swing arm. An underwater excavator for pits, equipped with a drum cutter, excavates the seabed and carries the excavated sludge upward through a mud pipe to discharge it to a sediment carrier.

As shown in FIG. 10, a conventional underwater excavator for a vertical hole is a steel pipe pile 28 vertically driven along a guide 27 of the leader 25 by a suspension jig 26 of the leader 25 of the pile driving ship 14. It is inserted into the stake and is directly suspended by the hanger of the pile driver, or the above-mentioned sludge pipe is fastened to the upper flange of the underwater excavator for vertical holes, and the upper end of the sludge pipe is suspended by the hanger of the pile boat. While being suspended, it can be lowered to the deepest part of the steel pipe pile. However, at that time, the cables 29 for power supply and operation for driving and operating the underwater excavator for pits are suspended together with the cable suspension bracket 31 by the suspension tool 30 of another system of the pile driving ship 14, Since the cable is unwound with the descent of the vertical hole underwater excavator 5, it is necessary to manually handle the cable to prevent it from getting tangled and to insert it smoothly. This work is dangerous and heavy labor at high places. . Therefore, until now, it could only be inserted into vertical piles, and it was considered technically quite difficult to apply it to oblique piles.

[0005]

As described above, in the insertion work into the steel pipe pile of the above-mentioned conventional underwater excavator for vertical holes, it is difficult to insert into the oblique pile and the deepest portion of the pile (sea bottom). )
When the cables such as power cable and operation cable connected to the underwater excavator for pits are unwound, it is necessary to manually handle them with the help of a crane to prevent them from getting entangled. There was a high risk and a problem because it was a heavy work in the place. Therefore,
When inserting an underwater excavator for pits into a steel pipe pile, many cables such as power cables and operation cables connected to the underwater excavator for pits at the deepest part (sea bottom) of the pile do not get caught. In addition, there has been a demand for an insertion device that can be smoothly inserted. On top of that, not only vertical piles but also diagonal piles that are driven diagonally into the water bottom can be used in the same way.Many cables such as power cables and operation cables for underwater excavators for vertical holes can be inserted simultaneously and smoothly. An insertion device was particularly desired.

The present invention has been made in view of the above circumstances, and it is possible to safely and easily insert an underwater excavator for a vertical hole into a diagonal pile as well as a vertical pile together with cables safely and easily. It is an object of the present invention to provide a method and a device for inserting the same.

[0007]

In order to achieve the above-mentioned object, the present invention hangs an underwater excavator through a concentric steel pipe pile that is connected to a holding pipe and its lower part from above the water. In the method of inserting an underwater excavator for a pit for excavating the deepest part of the steel pipe pile, in order to insert the underwater excavator for a pit into an oblique pile, in the holding pipe in a vertical state in advance. Insert and hold the underwater excavator for pit, and then align the guide fitting of the holding pipe with the guide of the leader of the pile driving ship, then pull up the holding pipe to the leader, and hold the holding pipe by the guide fitting to the leader. After tilting the leader in that state, the holding pipe is brought close to directly above the oblique pile, and after connecting the inclined holding pipe and the oblique pile, the underwater excavator for vertical holes is inclined using the holding pipe as a guide. Underwater excavator for pits characterized by being inserted into a pile It is an insertion method, and a submersible excavator is hung from the water through a concentric steel pipe pile connected to the holding pipe and its lower part, and the water for pit drilling for excavating the deepest part of the steel pipe pile by the underwater excavator. In an insertion device for a medium excavator, a reel for a power cable and an operation cable for driving and operating the underwater excavator for a well is arranged in the holding pipe on the water, and An excavator insertion device.

[0008]

Next, the operation of the inserting device for the underwater excavator for pits according to the present invention will be described. When the holding pipe is vertical, the underwater excavator for pit is suspended by a crane and stored. Then, in order to prevent the underwater excavator for pits from falling, the flange on the upper part of the main body of the underwater excavator for pits is sandwiched and held by the support on the upper part of the holding tube.

Next, the underwater excavator for pit and the holding pipe are integrally lifted by the lifting tool of the pile driving ship, and the guide metal of the holding pipe is aligned with the guide of the leader of the upright pile driving ship. Lift with a reader. Then, after moving the pile driving ship, tilt the leader of the pile driving ship to align the center line of the holding pipe with the center line of the oblique pile, and place the holding pipe directly above the upper end of the oblique pile protruding above the sea surface. Are brought close to each other, and both are connected by a guide tube.

After that, the underwater excavator for pits held by the support on the upper part of the holding pipe was hoisted with the hoisting equipment of the pile driving ship, and the support was removed, and the hoisting equipment of the pile driving ship was lowered. The underwater excavator for pits is lowered in the holding pipe, and the underwater excavator for pits is inserted into the oblique pile using the holding pipe as a guide. Then, the underwater excavator for pits is directly suspended by the hoisting equipment of a pile driving ship, or is suspended through the excavated mud sludge pipe, and is lowered to the deepest part of the oblique pile.

At this time, the cables for power supply and operation for driving and operating, which are connected to the underwater excavator for pit, are wound on a cable reel mounted around the holding tube. The underwater excavator for pits descends while pulling out items.

[0012]

Embodiments of the present invention will be described with reference to the drawings. In the present embodiment, as shown in FIGS. 1 and 2, a holding pipe 1 is erected on a guide 3 of a temporary placing table 2 placed on a barge ship or a pile driving ship 14 via a guide metal 3a.

An underwater excavator 5 for a vertical hole is provided in the holding pipe 1.
Are stored in advance, and the upper flange 7 of the underwater excavator 5 for vertical holes is sandwiched and held by the support 6 at the upper part of the holding pipe 1 so that the underwater excavator 5 for vertical holes does not fall. Further, on the outer periphery of the holding pipe 1, a cable reel 8 for a power cable and an operation cable for driving and operating the underwater excavator 5 for a vertical hole is arranged on a support base 9, and the support base is further provided. 9 and the cable 10 on the upper part of the holding tube 1.
Cable guide rollers 11 and 12 are attached.

When inserting the pit underwater excavator 5 into the steel pipe pile driven into the bottom of the water, as shown in FIG. 1, it was temporarily placed on the barge ship or the temporary stand 2 installed on the pile ship. As shown in FIG. 3, the holding pipe 1 and the pit underwater excavator 5 are directly attached to the guide 3 of the temporary stand 2 by the leader 15 of the pile driving ship 14.
Of the holding pipe 1 and the holding pipe 1 and the underwater excavator 5 for vertical holes are lifted together by the lifting tool 17 of the pile driving boat 14, and the guide 16 of the holding pipe 1 is guided to the guide 16 of the leader 15 of the pile driving boat 14. It can be attached with the hardware 3a.

Further, when it is not possible to hang it directly by the hoisting tool 17 of the pile driving ship 14 as shown in FIG. 3, as shown in FIG.
From the above, the holding pipe 1 and the underwater excavator 5 for vertical holes are hoisted together by the hoisting tool 19 of the crane 18 of the crane ship by the hoisting wire rope 22, and the guide 16 of the leader 15 of the pile driving ship 14
5, the guide metal pieces 3a of the holding pipe 1 previously opened by the hydraulic cylinders 20 are aligned, and when they meet each other, the hydraulic cylinders 20 are actuated again to form a pair of guide metal pieces 3a.
By closing a, both the holding pipe 1 and the underwater excavator 5 for pit can be attached to the guide 16 of the leader 15 of the pile driving ship 14. In this way, the leader 15 of the pile driver 14
Fig. 6 shows the holding pipe 1 attached to the
As shown in (3), the leader 15 of the pile driving ship 14 is tilted and then lowered downward, so that the steel pipe pile 21 that is inclined and projected above the sea surface can be brought close to and placed on the steel pipe pile 21.

In this state, since the holding pipe 1 is supported by the steel pipe pile 21 and the leader 15, as shown in FIG. 7, the hanging wire rope 22 on which the holding pipe 1 is hung is hung on the underwater excavator 5 for vertical holes. In order to replace the excavator, the excavated sludge drainage pipe 23 and the excavator suspension 24 are respectively bolted to the upper portion of the underwater excavator 5 for the vertical hole, and the excavator suspension 24 is attached by the suspension 17 of the pile driving ship 14.
Is slightly lifted via a hanging wire rope 22, the support 6 is removed, the lifting tool 17 of the pile driving ship 14 is lowered, and the steel pipe pile 2 is driven by inclining the underwater excavator 5 for vertical holes to the bottom of the water.
Insert into 1 gradually.

FIG. 8 shows a state in which one excavated sludge discharge pipe 23 is connected, and when the underwater excavator 5 for pits is gradually inserted downwardly, the underwater excavator 5 for pits is driven and Cables 10 for power supply and operation for operation are unwound from the cable reel 8 and the underwater excavator 5 for pit drills the steel pipe pile 2
Continue repeating until the bottom of pile 1 is reached.

FIG. 9 shows a funnel-shaped guide tube 13 attached to the lower end of the holding tube 1. (a) shows the case where the diameter of the holding tube 1 and the diameter of a steel pipe pile driven into water are the same. ,
(B) is a funnel-shaped guide pipe when the diameter of the steel pipe pile driven into water is smaller than the diameter of the holding pipe 1, and (c) is a diameter when the diameter of the steel pipe pile driven into water is larger than the diameter of the holding pipe 1. 13 is shown. Therefore, by using the funnel-shaped guide pipe 13, the holding pipe 1 can be connected to the steel pipe pile 21 of any diameter.

Therefore, according to this embodiment, the pile driver 14
The holding pipe 1 and the underwater excavator 5 for vertical holes are hoisted together by the hoisting tool 17 of the
6, the guide pipe 3a of the holding pipe 1 is attached to the holding pipe 1, and then the leader 15 of the pile driving ship 14 is tilted to lower the holding pipe 1 to approach the steel pipe pile 21 that is inclined and projected above the sea surface. The holding pipe 1 and the steel pipe pile 21 are connected with the funnel-shaped guide pipe 13.
The vertical excavator 5 for vertical shaft can be gradually inserted into the steel pipe pile 21 that is driven into the water bottom by lowering the hoisting tool 17 of the pile driving ship 14, so that the vertical shaft descends. Cables 10 such as power cables and operation cables that are connected to the underwater excavator 5 for holes can be smoothly inserted without being entangled, and not only vertical piles but also diagonal piles 21 that are diagonally driven into the water bottom Also, the holding pipe 1 can be smoothly inserted by using the holding pipe 1 as a guide only by pulling up the holding pipe 1 using the leader 15 of the pile driving ship 14 and tilting the leader 15 in that state.

[0020]

According to the present invention described above, not only the vertical piles but also the diagonal piles diagonally driven into the water bottom are pulled up by the holding pipe of the leader of the pile driving ship, and the leader is tilted in that state. There is an effect that the underwater excavator for pits can be smoothly inserted by using the holding pipe as a guide, and the reels for the power cable and operation cable for driving and operating the underwater digger for pits are described above. The power cable connected to the underwater excavator for pits, which is placed in the holding pipe above the water, so that when the underwater excavator for pits is inserted into the steel pipe pile, it simultaneously descends to the deepest part (sea bottom) of the pile. Cables such as and operation cables can be smoothly inserted without being entangled, so that work efficiency when excavating a deep portion of a pile driven into the water bottom is greatly improved.

[Brief description of drawings]

FIG. 1 is a side view of the present embodiment.

FIG. 2 is a plan view of the present embodiment.

FIG. 3 is an explanatory view showing how the holding pipe of the present embodiment is attached to a pile driving ship.

FIG. 4 is an explanatory view showing how the holding pipe of this embodiment is attached to a pile driving ship.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is an explanatory diagram showing a state of insertion into a diagonal steel pipe pile of the present embodiment.

FIG. 7 is an explanatory view showing a state of insertion into the diagonal steel pipe pile of the present embodiment.

FIG. 8 is an explanatory view showing a state of insertion into a diagonal steel pipe pile of the present embodiment.

FIG. 9 is a side view of the funnel-shaped guide tube attached to the lower end of the holding tube.

FIG. 10 is an explanatory diagram showing an insertion state of a conventional example.

[Explanation of symbols]

 1 Holding Pipe 2 Temporary Stand 3 Guide 3a Guide Hardware 4 Support Frame 5 Underwater Excavator for Vertical Hole 6 Support 7 Upper Flange 8 Cable Reel 9 Support Stand 10 Cables 11, 12 Cable Guide Roller 13 Funnel-shaped Guide Pipe 14 Piling Ship 15 Leader 16 Guide 17 Lifting tool 18 Crane 19 Lifting tool 20 Hydraulic cylinder 21 Steel pipe pile 22 Hanging wire rope 23 Excavation sludge drainage pipe 24 Excavator hanging hardware

 ─────────────────────────────────────────────────── ─── 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 for suspending an underwater excavator from above water through a concentric steel pipe pile connected to a holding pipe and a lower part thereof, and excavating the deepest part of the steel pipe pile by the underwater excavator. In the method of inserting an excavator, in order to insert the underwater excavator for pits into a diagonal pile, insert and hold the underwater excavator for pits in the holding pipe in a vertical state in advance, and then, Align the guide fitting of the holding pipe with the guide of the leader of the pile driving ship, then pull up the holding pipe to the leader, hold the holding pipe by the guide fitting on the leader, tilt the leader in that state, and then directly above the oblique pile. The holding pipe is brought close to the inclined holding pipe and the inclined pile is connected, and then the underwater excavator for vertical hole is inserted into the inclined pile by using the holding pipe as a guide. How to insert an excavator. 2. An underwater excavator for suspending an underwater excavator from above water through a concentric steel pipe pile connected to a holding pipe and a lower part thereof, and excavating the deepest part of the steel pipe pile by the underwater excavator. In an insertion device for an excavator, a reel for a power cable or an operating cable for driving or operating the underwater excavator for a pit is arranged in the holding pipe on the water, for underwater digging for a pit. Machine insertion device. 3. When the inner diameter of the concentric steel pipe pile connected to the lower portion of the holding pipe is different from the inner diameter of the holding pipe, a funnel-shaped guide pipe having an appropriate shape is arranged at the lower end of the holding pipe. The insertion device for an underwater excavator for a vertical hole according to claim 1 or 2.