JPH0550980A - Submerging and installing method for sinker - Google Patents

Abstract

PURPOSE:To provide a transporting method for a sinker as deep as its installation position and to submerge the sinker with stable condition with a big sinker floated without using a barge mounting a heavy machine such as big crane, or while attempting light weight by utilizing the buoyancy of the sinker with shallowly submerged condition if depth allowed. CONSTITUTION:A sinker 1 is supported by ropes 6 pulled out from winches amounted on two barges facing to each other by sandwiching the big sinker 1. The sinker 1 is moved as deep as its installation position with the above condition maintained. The sinker 1 is submerged while maintaining the sinker 1 under stable condition by letting out each rope 6 by almost the same length from each winch. This can be used for the case of pulling part of a floating body, the main body of a measurement facility for water quality, etc., moored by a tension leg system, into underwater against its buoyancy even when no barge mounting a heavy machine such as a big crane is prepared on lakes and marshes etc. The big and heavy weight sinker 1 can completely be submerged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applicable to lakes and marshes where a barge carrying heavy equipment such as a large crane is not prepared.
The present invention relates to a method of sinking a relatively large and heavy sinker on the bottom of a water, which is used when pulling a part of a floating body, which is the main body of a measurement facility for mooring water by a tension leg method, against the buoyancy and pulling it into the water.

[0002]

2. Description of the Related Art Generally, lakes and marshes are visited by many tourists as tourist sites, and many people enjoy sports such as water skiing and yachting. On the other hand, most lakes and marshes are polluted by domestic effluents, and the opportunity to measure water quality from the viewpoint of pollution control is increasing. However, since there are many tourists on the water as described above, it is necessary to measure the water quality so as not to disturb the tourists. Therefore, the present applicant has developed and proposed a measurement facility for water quality, etc. moored by the tension leg method, which occupies a small area on the water surface.

In this type of measuring facility, the main body of the facility is formed as a floating body, and a part of this floating body is pulled into the water to generate a large tension on the mooring ropes for mooring, so that it is used for a normal ship. Requires a sinker that is significantly heavier than the anchor. In addition, sludge is often deposited on the bottom of the lake, which is a soft ground, and in order to move the facility itself when changing the measurement point, increase the sinker's landing area and touch the ground. It is necessary to reduce the pressure and prevent burial, for which reason a fairly large sinker must be sunk. For example, the average diameter of a floating body is 4.2
In case of sinker used for m and height of 19.5m,
A large one with a weight of 150 tons and a landing area of 100 square meters is used.

[0004]

Such a large sinker having a relatively large weight and a large landing area is launched from the shore, transported to a predetermined sinking position, and then sinked to the water bottom there. Although some work is required, it is usually necessary to use a barge equipped with heavy equipment such as a large crane for this work. However, lakes and marshes usually do not have such large barges, and it is difficult to transport large sinkers to the measurement point and lay them down. A large amount of work was required to install a facility for measuring water quality, etc. by the method.

In view of the above problems, the present invention allows a large sinker to be sunk in a floating state, or at a shallow depth if the depth allows, without using a barge equipped with a heavy machine such as a large crane. In this state, it is possible to provide a method for transporting to the installation position and sinking in a stable state while reducing the weight by utilizing the buoyancy of this sinker.

[0006]

A sinker sinking method according to the present invention for achieving the above object is achieved by a rope pulled out from a winch mounted on two barges facing each other with a large sinker interposed therebetween. In this method, the sinker is supported, and in this state, the sinker is moved to the sinking position, and the cords are extended from each winch by substantially the same length to sink the sinker while maintaining the sinker in a stable state.

[0007]

[Operation] According to the present invention, two pontoons each equipped with a winch are arranged so as to face each other with a sinker sandwiched therebetween, and the sinker is levitated by a line pulled out from the winch, or a state where the sinker is shallowly sunk. When the sinker is to be sunk at a predetermined position while being carried while being supported by, each of the winches is extended by approximately the same length so that the sinker to be sunk does not become unstable in posture.

Therefore, even if a barge equipped with a heavy machine such as a large crane is not prepared, such as in a lake, a part of the floating body, which is the main body of the measurement facility for water quality moored by the tension leg system, is buoyant. It is possible to safely sink a large and heavy sinker, which is used when pulling it into the water against.

[0009]

EXAMPLES Examples of the present invention will be described below with reference to the drawings. First, as shown in FIG. 2, a ballast tank is formed inside to have buoyancy, and a sinker 1 formed so that water can be poured into the ballast tank at the installation point to be submerged is transported to a waterside by a slipway 2, and a tugboat 3 tow it to launch it, and then, as shown in FIG. 3, two pontoons 4 are arranged before and after the sinker 1 in the towing direction so as to sandwich the sinker 1, and each sinker 1 is mounted on each pontoon 4. While the sinker 1 is supported by the rope 6 drawn out from the winch 5 in a state where a part of the sinker 1 is exposed on the water surface, the tugboat 3 pulls the sinker 1 from the shore to a temporary mooring point near the installation point.

Next, as shown in FIG. 4, the sinker 1 is connected via a mooring line 8 to the floating body 7 which is a facility for measuring water quality and the like at the temporary mooring site, and then the sinker 1 is connected as shown in FIG. While pouring water into the inside of the ship, each of the winches 5 mounted on each of the pontoons 4 is extended with the ropes 6 of approximately the same length to sink the sinker 1 below the water surface, and in this state, the sinker 1 is towed together with the floating body 7 to the installation point. To do.

When the vehicle arrives at the installation point, the crane 9 is prepared to be lifted up so that the floating body 7 can be raised up as the sinker 1 sinks as shown in FIG. 6, and then the sinker sinking as shown in FIG. In order to prevent the posture of No. 1 from becoming unstable, each line 6 is extended from each winch 5 by approximately the same length, and the sinker 1 is sunk. FIG. 8 shows the sinker 1 landing on the bottom of the water.
Pulls a part of the floating body 7 into the water to apply tension to the mooring line 8 to moor the floating body 7. The installation status of the sinker 1 can be confirmed by visual inspection with the diver 10 or by shooting with the underwater camera 11. As shown in FIG. 1, pulleys 1b and 4b are provided respectively on the outer wall 1a of the sinker 1 and the rope-out end 4a on the pontoon 4, and the pulleys 1b and 4b are pulled out from the winch 5 through these pulleys 1b and 4b. The sinker 1 is supported by the cords 6.

As described above, according to the sinker 1 sinking method of the present invention, even in a lake or the like where the barge 4 equipped with a large crane or the like is not prepared, the main body of the water quality measuring facility is measured by the tension leg method. A large sinker 1 having a weight of 150 tons and a landing area of 100 square meters can be sunk, for example, when a part of a floating body 7 is pulled into water and moored. In addition, when the sinker 1 is sunk, each of the ropes 6 is extended from the winch 5 by substantially the same length, which means that the sinker 1 is in an unstable state in which the sinker 1 is largely tilted or swung during sinking. It means how to extend the rope 6 so that it does not happen, and does not mean that the rope 6 is extended in exactly the same length.

In this embodiment, the sinker 1 whose inside is formed as a ballast tank is used. However, even when a normal sinker 1 having no ballast tank is used,
By transporting the sinker under the surface of water, the load applied to the winch 5 can be reduced by utilizing the buoyancy of the sinker 1, and the transport becomes easy. Further, in this embodiment, the pontoons 4 are arranged in front of and behind the sinker 1 in the towing direction, and the sinker 1 is sandwiched between the sinkers 1 for towing.
For example, from the left and right sides of the sinker 1 in the towing direction,
It may be sandwiched between, and in essence, it is sufficient that the two pontoons 4 are arranged so as to face each other via the sinker 1. Further, a plurality of sets of one berth 4 may be used in the two groups as described above, while a winch 5 to be mounted on the berth 4 and a pulley 4b to be installed at the line feeding end 4a of the berth 4 are used. , And the number of pulleys 1b provided on the outer wall 1a of the sinker 1 may be appropriately changed in consideration of the weight of the sinker 1, the hoisting capacity of the winch 5, the tensile strength of the rope 6, and the like.

[0014]

According to the present invention, the sinkers are supported by the ropes drawn out from the winches mounted on the two barges facing each other with the large sinker sandwiched therebetween, and in this state, the sinkers are transported to the sinking position and the winches are moved. The sinker sinking method is a sinker sinking method in which each of the cords is paid out by substantially the same length and sinks while maintaining the sinker in a stable state, and therefore the following effects can be achieved.

Two berths each equipped with a winch are arranged so as to face each other with a sinker interposed therebetween, and the sinker is supported by the rope pulled out from the winch in a state of being levitated or being shallowly sunk. When transporting and sinking this sinker at a predetermined position, each line can be extended from each winch by approximately the same length so that the sinker to be sunk does not become unstable in posture. Even when there is no berth equipped with heavy equipment such as a large crane in the case of pulling a part of the floating body, which is the main body of the measurement facility for water quality moored by the tension leg method, into the water against the buoyancy. used,
A large and heavy sinker can be safely sunk.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a sinker is supported by a line pulled out from a winch of a barge.

FIG. 2 is a bird's-eye view of the sinker being launched.

FIG. 3 is a bird's-eye view of a state where the sinker is towed from the shore to the temporary mooring place.

FIG. 4 is a bird's-eye view of a state in which a sinker and a floating body are connected via mooring lines at a temporary mooring place.

FIG. 5 is a bird's-eye view of a state where the sinker and the floating body are towed from the temporary mooring place to the installation point.

FIG. 6 is a bird's-eye view of a state where preparation for sinker sinking is made at the installation point.

FIG. 7 is a bird's-eye view of the sinker being sunk at the installation point.

FIG. 8 is a bird's-eye view of a state where the sinker bottom landing condition is confirmed at the installation point.

[Explanation of symbols]

1 sinker 4 barges 5 winches 6 ropes

Claims (1)

[Claims] 1. A sinker supported by a winch mounted on two barges that face each other across a large sinker, and the sinker is supported in this state and transferred to a sinking position. The sinker sinking method in which the sinkers are submerged while feeding the sinkers at substantially the same length while keeping the sinkers stable.