JP2000016381A - Spud work boat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the safety of the work, to improve the working efficiency, to reduce the power to reduce the fuel consumption, and to suppress generation of the noise. SOLUTION: In a spud work boat to moor a hull by a spud driven into the water bottom during an underwater work, a shaft of a cursor sheave 12 is fixed to a spud 2. A wire 13 with one end fixed to a spud jacket 3 is stretched to the cursor sheave 12, the wire 13 led from the cursor sheave 12 is wound around a sheave device comprising a head sheave 14 and a cylinder sheave 15, and a common shaft fixing part of the cylinder sheave 15 is driven by a rod of a cylinder fixed to the hull.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spud work boat having a function of mooring a work boat during underwater work such as dredging or sucking sludge on the seabed.

[0002]

2. Description of the Related Art In such a spud work boat, a rod-shaped spud is dropped from the hull into the seabed ground by its own weight, and the spud is driven by a force proportional to the product of the falling speed and the weight of the spud to moor the work boat.

[0003] In a conventional spud work boat, the spud is suspended by a wire, and the wire is wound on a drum via a sheave. When the spud is raised, the sheave is wound up by a power winch drum by an electric hydraulic motor from inside the ship, and the hoisting drum is fixed by a brake band. When necessary, the spuds fall under their own weight by releasing the brakes and reversing the wire drum.
Braking suddenly on the way, stopping the winch drum, and fixing the position of the spud.

[0004]

However, in this conventional structure, the winch drum rotates rapidly when the spud is dropped, and the impact is so severe that it always feels a crisis. The spuds used when mooring a workboat or fixing the position of a workboat securely are round or square thick steel pipes weighing about 20 to 70 tons, and 25 to 35 m in length. Digits are usually used.
The problem is how to drive the spuds up or drop off sharply, depending on the working situation.

[0005] Therefore, the problem to be solved by the present invention is:
It is to perfect the safety of work, improve work efficiency, reduce power consumption, reduce fuel consumption, and suppress noise generation.

[0006]

In order to solve the above-mentioned problems, a spud work boat according to the present invention is a spud work boat moored by a spud whose hull is driven into the water bottom during underwater work. At the same time, a wire fixed at one end to a spud or a rag is suspended on the cursor sheave, and a wire led from the cursor sheave is wound around a sheave device including a head sheave and a cylinder sheave, and a common shaft of the cylinder sheave is provided. The fixed portion is driven by a rod of a cylinder fixed to the hull.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on embodiments shown in the drawings. FIG. 1 is a side view showing the entire spud work boat of the present invention, and FIG. 2 is a plan view thereof. In the drawing, 1 is a deck, 2 is a spud made of a round or square thick steel pipe having a weight of about 20 to 70 tons and a length of about 25 to 35 m, and 3 is a spud 2
4 is a swivelable crane cockpit, 5 is a boom that can be raised and lowered, 6 is a rock bar that breaks rock by dropping it in water, and 7 is a sludge in the water. The grab bucket to be scooped up, and 8 is a cab.

FIG. 3 is a schematic view of a spud elevating mechanism according to the present invention. In the figure, reference numeral 11 denotes a cursor integrated with the spud 2 by a pin or the like, 12 denotes a cursor sheave having a rotation axis fixed to the cursor 11, 13 denotes one end fixed to the spud or shank 3 and the other end fixed to the deck 1. Wire, 14 is a head sheave having a rotation axis fixed to the spuds and beams 3, 15
Is a cylinder sheave having a rotating shaft fixed to a rod 17 of a cylinder 16 installed on the deck 1.

In this embodiment, four wires are wound around the cylinder sheave 15 and two wires are wound around the cursor sheave 12, so that the movement of the rod 17 of the cylinder 16 is twice as much as the movement of the rod 17. The spud 2 moves by the amount.

FIG. 4 is a front view of an actual spud elevating mechanism.
FIG. 5 is a side view thereof. FIG. 6 is a front view when the spud 2 is dropped from the deck 1, and FIG. 7 is a side view thereof.

FIG. 8 shows a hydraulic control circuit for the cylinder 16, in which 18 is a piston, 19 is an oil tank,
0 is a head tank, 21 is an electric pump, 22 to 26 are each port of the cylinder 16, 27 to 29 are relief valves,
30 to 32 are check valves, and 33 is a pilot check valve.

When the spud 2 is dropped from the position shown in FIG. 4 to the position shown in FIG. 6, the relief valves 27 and 28 are opened. Then, since the weight of the spud 2 is applied upward to the rod 17, the piston 18 attempts to move upward. Therefore, the hydraulic oil above the piston 18 in the cylinder 16 moves freely to the lower part of the piston 18 in the cylinder 16 through the relief valves 27 and 28 and the check valves 30 and 31. This allows the piston 18
Rises, and the spud 2 falls at twice the rising speed of the piston 18 via the spud elevating mechanism, and the tip pierces the seabed into the ground. Thus, the deck 1 is moored.

When raising the spud 2 from the sea floor,
Electric pump 2 with relief valves 27 and 28 closed
1, the oil from the oil tank 19 is supplied to the piston 1 in the cylinder 16 through the pilot check valve 33.
8 top. As a result, the piston 18 descends, and the spud 2 is raised through the spud elevating mechanism.

[0014]

As described above, according to the present invention, the following effects can be obtained.

(1) When raising and lowering the spud, the spud can be moved up and down (winding up and down) by changing the flow direction of the cylinder upward or downward. When dropping abruptly, it is only necessary to move a large amount of hydraulic pressure, so that dangerous work is eliminated. Since there is no complexity in operation, even a layman can work.

(2) Unlike the drum type winch, there is no need to wind the wire, so that the risk of breakage of the wire is small. The durability can be about three times as long as the drum winch, and almost no wear occurs for about three years compared to the conventional one year or less.

(3) As described above, safety of work can be ensured, work efficiency can be improved, power is small, and fuel consumption is reduced by half, which contributes to global environment, pollution and securing resources. In addition, since the sound when the spud is raised and lowered is quiet, noise does not affect the surroundings during work, and it is possible to deal with environmental problems.

[Brief description of the drawings]

FIG. 1 is a side view showing an entire spud work boat of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a schematic view of a spud elevating mechanism according to the present invention.

FIG. 4 is a front view of an actual spud elevating mechanism.

FIG. 5 is a side view of FIG. 4;

FIG. 6 is a front view when the spud is dropped from the deck.

FIG. 7 is a side view of FIG. 6;

FIG. 8 shows a hydraulic control circuit of a cylinder.

[Explanation of symbols]

1 deck, 2 spuds, 3 spuds, 4
Crane cockpit, 5 booms, 6 crushed rods, 7 grab buckets, 8 cabins, 11 cursors, 12 cursor sheaves, 13 wires, 14 head sheaves, 15 cylinder sheaves, 16 cylinders, 17 rods, 18
Piston, 19 oil tank, 20 head tank, 21
Electric pump, 22 to 26 ports, 27 to 29 relief valve, 30 to 32 check valve, 33 pilot check valve

Claims (1)

[Claims] 1. A spud work boat moored by a spud in which a hull is driven into the water bottom during underwater work, wherein a cursor sheave shaft is fixed to the spud, and a wire having one end fixed to the spud or wobbler is hung on the cursor sheave. And a wire led from the cursor sheave,
A spud work boat wound around a sheave device composed of a head sheave and a cylinder sheave, wherein a common shaft fixing portion of the cylinder sheave is driven by a rod of a cylinder fixed to the hull.