JPS6263717A - Sand pile-driving ship - Google Patents

Abstract

PURPOSE:To obtain a sufficient length of construction by a method in which a sand-charging hopper is provided below a water-proof cover hung down in a vertically movable manner, a tubular pile is provided to the hopper, and a pile drive to strike a pile through the hopper is provided in the cover. CONSTITUTION:Under a condition that an auxiliary leader 3 hung down from a supporter 2b for hanging down and a water-proof cover 11 are pulled upwards, a pile-driving ship is towed to a construction site. A tubular pile 10 is attached to the lower end of a hopper 9 for charging sand, and a winch 1a on the hull 1 is operated to lower the leader 3 and the cover 11 into sea. A vibro-pile driver 8 is operated, the pile 10 is driven into the seabed ground while striking the upper end of the hopper 9, and the sand on the hull 1 is sent with compressed air through the hopper 9 into the pile 10 by operating a pneumatic type sand sender 17.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to sand drains and sand compaction systems.
This article relates to sand pile driving vessels used for soft ground improvement work such as sand pile driving.

rfibmtn+261 Generally, a vibrating pile driver installed for sand pile driving work in a sand pile driving ship used for soft ground improvement work, and a hanging wire for suspending the same vibrating pile driver. The rope, V11 bomber, sand hopper for feeding sand into the sand pile, etc. are all designed to be used at sea, and transport sand from the above-mentioned equipment at sea to the seabed soil. For this purpose, sand piles with a length extending from the sea to the bottom of the seabed are used.

When driving the sand pile into the seabed, the sand pile is driven using a vibrating pile driver while maintaining an appropriate angle to the seabed while being guided by a leader installed on the ship's hull.

Then, inside a sand pile driven to a predetermined depth on the seabed,
A hopper will be used to feed sand through the opening at the top of the sand pile, which protrudes into the sea. In this way, the sand sent into the sand pile in the seabed soil is compressed by the vibration of the vibrating pile driver and buried in the seabed soil, thereby improving the soft ground.

[The problem that the invention is trying to solve]

However, when using a conventional sand pile driving ship to drive sand piles deep into the soil of the seabed, the length of the sand pile (less than C, called the construction length) must be sufficiently large. At the same time, when driving sand piles at a point with a large seabed depth, extremely long sand piles must be used that have a length equal to the seabed depth added to the construction length. Furthermore, the height of the leader installed on the ship's hull for guiding such sand piles needs to be increased depending on the quality of construction.

Therefore, not only does this lead to an increase in equipment costs, but when the sand layer pouring ship attempts to pass under bridges or perform construction in areas subject to aviation regulations, it is necessary to Navigation and construction are impossible due to interference from the leader.

The present invention is an attempt to solve the above-mentioned problems, and is designed so that there is no problem in passing under bridges or in construction areas where air traffic is restricted.
To provide a sand piling ship capable of obtaining a sufficient construction length without increasing the height of a leader on the ship.

[Means for solving problems]

For this reason, the sand pile driving boat of the present invention includes a waterproof cover that can be raised and lowered while being guided by a vertical leader attached to the hull;
The waterproof cover has an opening only at the bottom end, and sand is poured into the sand hopper attached to the bottom of the waterproof cover. Tubular piles are provided, and a vibrating pile driver that drives the piles through the hopper is disposed inside the waterproof cover, and a sand pressure feeding piping is connected to the hopper from a pneumatic sand feeding device onboard the ship. It is characterized by being

[Sakugetsu]

In the sand pile driving boat of the present invention described above, a waterproof cover is provided.

A sand charging hopper and a vibrating pile driver are lowered into the sea together with a tubular sand pile while being suspended by a suspension mechanism. After the vibrating pile driver operates under the sea and buries the lower end of the tubular pile in the soil on the seabed, the sand sent from the pneumatic sand pumping device on the ship to the sand charging hopper is poured into the tubular pile. It is poured into the soil on the ocean floor through a hollow part.

At this time, the vibratory pile driver is covered from above by a waterproof cover, and seawater does not enter the interior space of the waterproof cover that includes the vibratory pile driver, so the vibratory pile driver is submerged underwater. Even though it is suspended in the water, it never touches the seawater.

〔Example〕

Hereinafter, a sand pile driving boat as an embodiment of the present invention will be explained with reference to the drawings. FIG. 1 is a side view thereof, and FIG. 2 is a sectional view of its pneumatic sand pumping device.

As shown in FIGS. 1 and 2, a main leader 2 is erected at the front end of the hull 1 while being supported by a stay 2a, and a suspension support member 2b is provided at the upper end of the main leader 2. ing.

An auxiliary leader 3 is attached to the side of the main leader 2 so as to be slidable in the vertical direction, and the auxiliary leader 3 is guided by a sheave 3a provided at the upper end and suspended via a hanging wire rope 4 It is suspended from the lowering support member 2b.

The waterproof cover 11 is attached so as to be slidable downward.
is guided by the sheave lla provided at its upper end,
Suspension support member 2b via suspension wire rope 5
is suspended from.

Note that the hanging wire ropes 4 and 5 are both connected to a winch 1a on the hull 1, so that the auxiliary leader 3 and the waterproof cover 11 can be operated in the vertical direction from the hull 1.

The waterproof cover 11 has a hollow cylindrical shape and has an opening only at its lower end. One end of a wire rope 112 for drawing in the waterproof cover is attached to the opening at the lower end, and the other end of the wire rope 12 passes through the sheave 13 provided at the lower end of the auxiliary leader 3 while moving the upper part of the auxiliary leader 3. Since the waterproof cover 11 is wound up by a retractable winch 14 installed at the same time, the waterproof cover 11 is always urged downward.

Further, the winding of the retracting winch 14 is performed in accordance with the amount of movement of the waterproof cover detected by the wire rope 15 for indicating the position of the shock absorber interposed between the upper part of the waterproof cover 11 and the upper part of the auxiliary leader 3. Waterproof cover 11
The downward biasing force applied to is always controlled to an appropriate magnitude.

A sand charging hopper 9 is fixedly attached to the lower part of the waterproof cover 11, and a tubular pile 10 as a sand pile for construction is attached to the lower part of the sand charging hopper 9.

The upper end of the sand charging hopper 9 is located a suitable distance above the lower end of the waterproof cover 11, and a sand pressure feeding pipe 16 is connected to the sand charging hopper 9.

A shock absorber 6 is attached to the inside upper end of the waterproof cover 11, and a vibrating pile driver 8 is suspended from the shock absorber 6 via a wire lobe 7, and the vibrating pile driver 8!8 is connected to a hopper for sand injection. The lower end of the vibrating pile driver 8 is always located above the lower end of the waterproof cover 11 by an appropriate distance or more.

On the other hand, the hull 1 is used to feed sand into the sand charging hopper 9.
In the pneumatic sand pressure feeding device 1i17 provided above, a rotary valve 22 is fitted inside the main body 18, and a hopper 25 is provided in the second part of the main body 18, as well as air intake. ?
2G is connected, and the sand pressure delivery Ir is connected to the bottom of the main body 1B.
f16 is already connected.

The rotation 022 is caused by a motor 24 installed outside the main body 18.
The hole 22a provided in the rotary valve 22 rotates by being driven by the rotary valve 22.
When the hopper 22a is located above the hopper 25
It communicates with the sand input port 19 at the bottom, and sand is input from the hopper 25 into the sand chamber 23 inside the chamber 22. At this time, a hole 22b provided on the opposite side to the hole 22a in the rotary valve 22
is closed by the lower surface of the main body 18.

Thereafter, when the rotary valve 22 is rotated 180° and the hole 22a is positioned downward, the same diameter 22a communicates with the sand pressure pipe stage inlet 21 of the sand pressure pipe 16, and at the same time, the hole 22b is located upward and the air intake Since it communicates with the air intake port 20 of the inlet pipe 26, compressed air sent from a compressor (not shown) provided at one end of the air intake pipe 26 flows from the air intake port 20 into the sand chamber 23 in the rotary valve 22. While mixing with the sand in the sand chamber 23, the air further flows from the sand pressure pipe stage inlet 21 to the sand charging hopper 9 via the sand pressure pipe f1G.

Since the sand pile driving ship as an embodiment of the present invention is configured as described above, when moving to the work site,
Sailing with the auxiliary leader 3 and waterproof cover 11 suspended from the suspension support member 2b lifted higher,
After arriving at the work site, the tubular pile 10 is attached to the lower end of the sand charging hopper 9, and the winch 1a on the hull 1 is driven to adjust the auxiliary leader 3 and waterproof cover 11 to the seabed surface and construction length to be constructed. and lower it to a suitable position in the sea.

At this time, the underwater waterproof cover 11 is filled with air and receives upward buoyancy from the seawater.
The downward force exerted by the waterproof cover retracting wire rope 12 acts to cancel the buoyancy, so the waterproof cover 1
1 is not affected by buoyancy.

Waterproof cover 11 that has descended to a predetermined position underwater
Since the air inside is compressed, it moves upward from the lower end of the waterproof cover 11, but the upper end of the sand charging hopper 9 is provided so as to be located above the lower end of the waterproof cover 11 by an appropriate distance. Therefore, the vibrating pile driver 8, which is located above the sand charging hopper 9 to pound the upper end surface of the sand charging hopper 9, does not come into contact with seawater.

Therefore, the vibratory pile driver 8 is able to exhibit the same operational performance as the conventional one when used at sea.

After driving the tubular pile 10 to a predetermined point in the seabed soil by operating the vibrating pile driver 8 and pounding the upper end surface of the sand charging hopper 9, the pneumatic sand pumping device 17 on the hull 1 is driven.
Activate to send the sand on the hull 1 together with compressed air to the sand hopper 9 in the sea! ) into. At this time, the air sent into the sand charging hopper 9 is discharged into the waterproof cover 11 from a vent (not shown) provided in the second part of the sand charging hopper 9, and is left inside the sand charging hopper 9. The sand is poured from inside the sand charging hopper 9 to the lower tubular pile 10/F'l.
+45 m! [-zv1tel tsuP+s /In addition, the air discharged into the waterproof cover 11 is
By increasing the air pressure inside the waterproof cover 11, the sea level inside the waterproof cover 11 is further pushed down, and the waterproof effect for the vibrating pile driver 8 is further ensured, and the excess air inside the waterproof cover 11 is is naturally discharged from the lower end of the waterproof cover 11 to the sea.

The intended ground improvement work is performed by compressing the sand supplied inside the tubular pile 10 while vibrating it with the vibrating pile driver 8, and embedding it in the seabed soil, as in the conventional method.

In this way, by providing a simple waterproof cover 11, equipment such as the vibrating pile driver 8 that has been conventionally used at sea can be used underwater as is, and when used underwater, it can maintain the same operating performance as in the air. can get.

Therefore, the length of the tubular pile 10 used for the work can be made shorter than in the conventional case by only the depth outside the construction sea area, and the main leader 2 erected on the hull 1 also has a length of the construction length of the tubular pile 10. There is no need to raise the height depending on the weather, and waterproof cover at sea 11° Vibrating pile driver 8. Tubular pile 10 grade 3
Since the height required for the installation of seed equipment (': industry, etc.) is sufficient, the length of the leader 2 can also be 1σ.

In addition, the hull 11-, the sand feeding 1± of the hopper 9 for feeding sand into the sea, the pneumatic sand feeding device 17 using air pressure, the hull 1''2, and the hopper 9 for feeding sand into the sea. There is also the advantage that it can be carried out reliably and quickly even if the deviation between the two is large.

〔Effect of the invention〕

As described in detail in 1 and 9 below, according to the sand pile driving boat of the present invention, there is a waterproof cover that can be raised and lowered guided by a leader attached to the hull in the vertical force direction, and a suspension of the waterproof cover. 1, the waterproof cover has an opening only at the lower end and is attached to the bottom of the waterproof cover.
: A tubular pile is installed into which sand is fed from the same hopper.
In addition, a vibrating pile driver for driving the pile through the hopper is disposed inside the waterproof cover, and a sand pumping piping is connected from the pneumatic sand pumping device on the ship to the hopper. With this configuration, it is now possible to use the equipment conventionally used in trenches 1 for work underwater without degrading its performance.
This makes it possible to reduce the height of the leader installed on the ship's hull, making it possible to carry out construction work in transit areas or in aviation-regulated areas without any problems.

In addition, the equipment provided for waterproofing equipment used underwater is very simple, so it can be provided extremely easily and at low cost.

Furthermore, since the quality of the leader and the tubular pile to be constructed can be significantly shortened, there is also the advantage that construction costs and equipment costs can be reduced.

[Brief explanation of the drawing]

1 and 2 show a sand pile driving boat as an embodiment of the present invention, FIG. 1 is a side view thereof, and FIG. 2 is a sectional view of its pneumatic sand pumping device. 1... Hull, 1a... Winch, 2... Main leader, 2a
・・Stay, 2b・・Suspension support member, 3・・Auxiliary leader, 3a・・Sheave, 4.5・・・Suspension wire robe, 6・・Conflict 2 tai, 7・・・Wire robe, 8・・Vibratory pile driver, 9. Hopper for sand input, 10. Tubular pile as sand pile, 11. Waterproof cover, 11a. Sheave, 1
2. Wire robe for retracting the waterproof cover, 13. Sheave, 14. Retraction winch, 15. Wire robe for indicating buffer position, 16. Sand pressure feeding piping, 17. Pneumatic sand pressure feeding device, 18. Sand Main body of pressure feeding device, 19... Sand input port, 20... Air intake port, 21... Sand pressure feeding pipe input port, 22... Rotary valve, 22a, 22b... Hole, 23...
Sand chamber, 24. Motor, 25. Hopper, 26. Air intake pipe.

Claims (1)

[Claims] The waterproof cover is equipped with a waterproof cover that can be moved up and down guided by a vertical leader attached to the hull, and a suspension mechanism for the waterproof cover. The attached sand charging hopper is provided with a tubular pile into which sand is charged from the hopper, and a vibrating pile driver for driving the pile through the hopper is disposed inside the waterproof cover. , a sand piling ship, characterized in that a sand pumping pipe is connected to the hopper from a pneumatic sand pumping device on the ship.