JP2001199388A - Water transporting method and water bottom installing method of large heavy object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transporting/installing method of a large ocean rig that does not require usage of a crane and transportation by a barge. SOLUTION: A large heavy object for the ocean rig is previously manufactured and assembled in a shipbuilding dock, the dock is filled with water, and a winding ship including one or a plurality of hoisting devices is moved onto the large heavy object. At this time, the other end of a mooring rope mounted to the large heavy object and then fixed onto the hoisting ship at its one end or a mooring rope fixed to the large heavy object at its one and is wound by the hoisting devices to float the large heavy object in the water. The hoisting ship is moved as it is and transported on the water to directly above part of a position for the installation, and then the mooring rope is unwound by the hoisting devices. Thus, the large heavy object is hoisted down onto water bottom.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of transporting large heavy objects over water in oceans, rivers, lakes, and marshes, and to a method of installing the same at a predetermined position on the bottom of the water.

[0002]

2. Description of the Related Art Conventionally, when a large heavy object such as a concrete skeleton for a buried tunnel is transported by water, the inside of the skeleton is drained, the water inside the skeleton is drained, and the skeleton itself is floated on the water surface and towed. It is common to use the method of
In the case of transporting large solid objects such as marine structure anchors by water, it is common to use a method of loading on a barge and towing. In the former, after towing to a predetermined area, water is injected into the skeleton to control the underwater weight of large heavy objects, and further, by adjusting the sinking speed and position with the crane of a relatively small hoist ship, it is relatively easy. It is possible to sink large heavy objects to the bottom of the water. In the latter case, on the other hand, after towing the barge to a predetermined sea area , a large heavy object is lifted by a crane of a large hoist ship, and the sinking speed is controlled by adjusting the lifting speed of the crane, while sinking it to the bottom of the water. In addition to the fact that charter fees for large hoist ships are required, anchoring to fix the hoist ships is not possible in deep water, and the hoist ships are fixed by pushing from both sides, There is a problem that it is not suitable for sinking a large heavy object in a deep water area because sufficient stability for suspending the heavy object cannot be obtained.

[0003]

In the case of a large heavy object, for example, an anchor as a large offshore structure, it is necessary to transport the anchor to a sea area where the anchor is solid because the anchor is solid and is loaded on a barge and towed. Under conditions where installation environment conditions are becoming more and more severe, such as being unable to cope with large-scale structures, It is not possible to adopt the conventional method using.

[0004] It is an object of the present invention to provide a method of transporting and installing a large offshore structure which does not require the use of a crane and transportation by a barge in the prior art as described above.

[0005]

Means for Solving the Problems Accordingly, the present inventors have:
After conducting various studies, the take-up ship was used to transport large offshore structures,
The present inventors have found that the use of the settling means makes it unnecessary to use a crane, for example, and eliminates the need to load a barge.

According to the method for transporting large heavy goods by water according to the present invention, large heavy goods such as anchors for offshore structures can be transported in a compartment where water can be charged and drained, for example, at a shipyard dock. In advance, manufacture and assemble in a shallow place underwater. For example, when manufactured and assembled in such a compartment, the compartment is filled with water and large heavy objects are brought into the water. Alternatively, in the case of manufacturing and assembling in shallow water, a large heavy object is brought into the water by moving it to a deeper place. In this way, the large heavy object is brought into the water so that the take-up ship equipped with one or more winding devices can be moved onto the large heavy object.

Next, the large heavy object or the mooring cable attached to the take-up ship is wound up by a winding device to hold the large heavy object in water and float.

More specifically, a mooring line having one end fixed to a take-up ship is attached to a large heavy object via a hook or a pulley, and then wound from the other end, or one end is fixed to the large heavy object. By winding the other end of the mooring line with the winding device as it is, a large heavy object is held in water.
In this case, a large heavy object may be wound up until it floats, or it may be held by a winding device and then further filled with water in a compartment such as a dock and floated using the buoyancy of the winding boat. good. A pulley is attached to each of the large heavy object and the take-up ship, and one end of the mooring line is fixed to the take-up ship or the large heavy object, and the mooring line is wound around the pulley of the large heavy object and the take-up ship. By winding the rope, the winding tension acting on the mooring rope can be reduced.

[0009] The large heavy object is held under the water in this manner, and the large heavy object is transported to a predetermined area by moving the take-up ship as it is.

In another aspect of the present invention, a large-sized heavy object is suspended underwater by a take-up boat equipped with a take-up device, transported over the water to a position just above an installation position, and then moved by the take-up device. This is a method for installing a large heavy object on the water floor, characterized by hanging a large heavy object on the water bottom by unwinding the mooring line.

As described above, according to the present invention, there is no need for a hoist ship for loading a large heavy object on a barge, and since the transportation can be started only by suspending the large heavy object in water, the working time is reduced. It can be shortened.

Further, according to the present invention, a large hoist ship is not required for laying large heavy objects on the water floor, and large heavy objects can be laid on the water floor more easily and in a shorter time than the prior art. In addition, the work of laying large heavy objects in the deep water can be performed relatively easily.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION As large-sized heavy objects in the present invention, various objects such as anchors for offshore structures, skeletons for submerged tunnels, caisson, fish reefs, and templates for offshore oil fields can be considered. The present invention will be described using an anchor as an example.

FIGS. 1 (a) to 1 (d) are drawings made at a shipyard dock.
It is explanatory drawing of each process of the water carrying method of the large heavy goods installed in the sea floor like an assembled anchor. FIG. 1 (a) shows a process of manufacturing and assembling a large heavy object, for example, an anchor which is one of the marine structures. Do. The manufacturing and assembling steps at this time may be performed by a conventional method, and the present invention is not particularly limited.

As shown in FIG. 1 (b), after the manufacture and assembly of the anchor 1 is completed, the dock 10 is filled with water, and the anchor 1 is brought into the middle water. Next, the take-up ship 3 is towed into the dock and is positioned on the anchor 1 that has been manufactured and assembled. After the take-up ship 3 is moved onto the anchor in this manner, one end of the mooring line 2 is fixed to the anchor 1 and the other end is attached to the take-up device of the take-up ship 3.
Alternatively, one end is fixed to the take-up ship and attached to the take-up device via an appropriate attachment portion of the anchor.

After the installation of the mooring lines is completed, the winding is started, and the anchor 1 is held close to the winding boat in the water to accompany the winding boat. Even the anchor 1 which is a large heavy object can be suspended from the take-up ship 3 relatively easily under the buoyancy of water. The situation at this time is shown in FIG.

The dock 10 may be charged with water in two stages. That is, first, the winding vessel 3 is filled with water to a sufficient water level so as to be above the anchor 1, and the mooring line is attached to the anchor 1.
Alternatively, the anchor 1 may be suspended by utilizing the buoyancy of the winding boat by attaching to the winding device of the winding boat 3 and further filling with water.

Next, as shown in FIG.
Is firmly fixed to the hull and / or the anchor 1 and then gets out of the dock and towed by the tugboat 4 to the target sea area . Even in this case, since the anchor 1 is submerged in the water, the towing load is reduced as compared with the conventional barge transport.

As described above, according to the present invention, as shown in FIG. 1, the steps from lifting a heavy heavy object to excavation and transportation are very simple, and it is easy to increase the size of a large heavy object. Can follow.

FIG. 2 is a view for explaining another embodiment for holding a large heavy object 1 'such as an anchor in water. Large heavy objects
By attaching the pulley 6 to both 1 'and the take-up boat 3, the take-up tension of the mooring line 2 can be reduced.

FIGS. 3 (a) and 3 (b) show how the anchor 1 towed and transported to the target area as described above is submerged on the seabed. FIG. 3A shows a state when the vehicle arrives at the destination sea area, and illustrates a situation immediately before the burial of the anchor 1 is started. FIG. 3 (b) shows a state in which the mooring line 2 is gradually rewound from the original position indicated by the dashed line, and the anchor 1 is lowered toward the seabed in the sea.

In the drawing, reference numeral 5 denotes a transbonder (position detecting device) for rewinding the mooring line 2 gradually while confirming the position and adjusting the posture by a signal from the transbonder.

At this time, the number of the mooring lines 2
Although the number is two, the number may be increased in order to increase the stability, but it is preferable to arrange them so that the balance is maintained. However, if there is too much, the work of rewinding the mooring cable 2 becomes complicated.

As described above, according to the method of installing a large heavy object on the water bottom according to the present invention, hanging and installing a large heavy object on the water bottom can be performed very easily, as shown in FIG. .

[0025]

According to the present invention, the take-up device mounted on the take-up ship hoists the mooring line attached to the large-size load, lifts the heavy load into the water, and moves the take-up ship as it is by towing. This facilitates the easy transport of large heavy goods by water. In addition, after moving to the laying place, the mooring line is unwound with a winding device, so that a large heavy object can be easily suspended and installed on the water bottom. Therefore, according to the present invention, there is no need for loading / transporting by a barge, which is conventionally required, and it is not necessary to use a large crane. The significance is great.

[Brief description of the drawings]

FIGS. 1 (a) and 1 (b) are schematic explanatory views showing each step of a method for transporting a large heavy object over water according to the present invention when a large heavy object is manufactured at a shipyard dock.

FIG. 2 is a diagram illustrating a mode for holding a large heavy object in water.

FIGS. 3 (a) and 3 (b) are schematic explanatory views showing each step of a method for installing a large heavy object on a water bottom according to the present invention.

[Explanation of symbols]

 1: large heavy object, 2: mooring line 3: take-up boat, 4: tug boat 5: transponder (position detection device) 6: pulley

Continued on the front page (72) Inventor Ken Watanabe 4-33, Kitahama, Chuo-ku, Osaka City, Osaka Prefecture Inside Sumitomo Metal Industries, Ltd. (72) Inventor Takayuki Saito 16-3 Onogawa Tsukuba, Ibaraki Prefecture Ministry of International Trade and Industry (72) Inventor Yasuo Miyagawa Inside Kansai Design Co., Ltd. 1-1-10 Honjo Higashi, Kita-ku, Osaka City, Osaka Prefecture

Claims (3)

[Claims] 1. Bringing a large heavy object into the water so that a take-up ship equipped with one or more winding devices can be moved onto the large heavy object; A large heavy object on the water characterized by holding a large heavy object in the water by winding the mooring line attached to the ship with a winding device, and transporting the large heavy object by moving the winding ship. Transportation method. 2. Pulleys are attached to both the heavy load and the take-up boat, and the heavy load is held underwater with the mooring lines wound around the pulleys. A method for transporting large heavy goods by water as described above. 3. A large heavy object which is suspended in water by a take-up boat equipped with a take-up device and transported to the water just above a set-up position, and then the mooring line is unwound by the take-up device. A method for installing a large heavy object on the water bottom, characterized by hanging the object on the water bottom.