JP3484413B2 - Mooring lines for floating structures - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating breakwater, a floating pier, a floating type offshore oil production facility for production, storage, and offloading of oil, and an underwater installation at a sea airport or the like. The present invention relates to mooring lines for floating structures. 2. Description of the Related Art A conventional mooring line for a floating offshore structure is a floating structure such as a floating breakwater, which is located in a shallow water area 1 as shown in FIG. The mooring chain 10 is moored by being connected to a concrete or steel anchor 12 provided on the water bottom 2 by a mooring chain 11. Further, as shown in FIG. 5, in a floating structure 10 such as an oil mining platform, which is disposed on a deep water, a mooring cable 13 made of a PC steel material subjected to anticorrosion treatment is connected to an anchor made of concrete or steel. After firmly connecting to the fixing member 14 by using the fixing member 15, the mooring line 13 is tensioned vertically without slack, and is fixed to the fixing portion 16 of the floating structure 10 to be moored. FIG. 6 is an explanatory view showing a conventional method of installing the mooring cable 13 when the water depth shown in FIG. 5 is large. FIG.
As shown in (a), the mooring line 13 is suspended in the water by the crane 36 of the barge 33, and the diver 37
Is attached to the fixing body 15 of the concrete anchor 14 provided in the above. [0006] In the example of FIG. 6, a fixing portion 17 is previously attached to the lower end of the mooring line 11, and this may be locked to the fixing body 15 of the concrete anchor 14. FIG. 6B shows the locked state. Next, the upper end of the mooring line 11 is fixed to the floating structure 10. In this case, the length of the mooring line 11 needs to be adjusted. FIG. 7 shows another fixing method, in which a fixing device 18 is fixed to a fixing body 15 of a concrete anchor 14, and a concrete covering 19 is applied as shown in FIG. . This work is also a diving work, so construction is not easy. [0006] In the conventional mooring lines of floating offshore structures, there is a problem of corrosion of mooring chains and portions where the mooring lines are anchored to anchors at the bottom of the water. In this case, if a tendon made of FRP (fiber reinforced synthetic resin) is used as the mooring line, the problem of corrosion is eliminated, but corrosion of the metal fixing device in the fixing section is inevitable. Also,
As an issue other than corrosion, it is difficult to install multiple mooring lines as planned. Even if it becomes necessary to adjust the length of the mooring line over time, the adjustment operation is not easy. An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a mooring line which does not have a fixing portion which may be corroded in water or in the sea. According to the present invention, there is provided a mooring line for mooring a floating type structure, wherein an intermediate portion of the mooring line is movably locked to a concrete anchor at the bottom of the water, and both ends of the mooring line are connected to each other. A mooring line for a floating structure, which is fixed to the floating structure. Corrosion-protected P for mooring lines
Use C steel, FRP tendon, chain, or the like. ADVANTAGE OF THE INVENTION According to this invention, the problem of the corrosion of the anchoring part which joins a mooring line and a concrete anchor is solved. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the structure of a mooring line according to an embodiment of the present invention. A mooring method using the mooring line according to the present invention will be described. In FIG. 1, the mooring line 21 is made of a PC steel or FRP tendon subjected to anticorrosion treatment. PC
The corrosion prevention treatment of the steel material is achieved by, for example, performing corrosion protection on the surface of the PC steel material itself or coating the PC steel material with a corrosion protection pipe. The anchor 22 is made of concrete, and anchors the floating offshore structure 10 by its weight. The mooring lines 21 are arranged in a U-shape as shown in FIG. The mooring line 21 is connected to the concrete anchor 22 only by being inserted in a U-shape, and a conventional fixing body is not used. Therefore, there is no problem of corrosion of the portion connecting the mooring cable 21 and the concrete anchor 22. Both ends of the mooring line 21 are fixed to the floating structure 10 by the fixing unit 23. FIG. 2 is a flow chart showing the construction procedure of the embodiment of FIG. (A) When the concrete anchor 22 is
Installed in At this time, the pilot wire 31 is previously inserted into the U-shaped insertion hole 24 of the concrete anchor 22, and both ends of the pilot wire 31 are connected to the buoy 32. (B) A mooring cable 21 such as a PC cable is connected to one end of the pilot wire 31. Mooring line 2
1 is unwound from a drum 34 mounted on a barge 33.
The other end of the pilot wire 31 is pulled up as indicated by an arrow 35 and the mooring cable 21 is drawn into the U-shaped insertion hole 24 of the concrete anchor 22. (C) When the pulling of the pilot wire 31 is completed, the mooring cable 21 passes through the concrete anchor 22 and both ends thereof are on the water. The fixing portions 23 at both ends of the mooring line 21 are fixed to the floating structure 10. FIG. 3 shows a mooring line 11 according to an embodiment moored on a shallow water bottom. The mooring line 11 is usually composed of a mooring chain or the like. Both ends of the mooring cable 11 are fixed to the floating structure 10 through a mooring fitting or the like provided on the concrete anchor 12. This mooring line is also not fixed at the concrete anchor portion and can move freely. Since fixing is performed on the floating structure, construction is extremely easy. According to the present invention, unlike the related art, one mooring cable 11 or 21 having two U-shaped bends is fixed on the floating structure and has no anchoring portion on the water bottom. In addition, it is much easier to adjust the length of the mooring line, and the working time can be greatly reduced. Further, the length of the mooring line can be easily adjusted even after the date and time has elapsed. Furthermore, since the length of the mooring line 11 or 21 is allowed to vary even when the sea is stormy, an effect of preventing an excessive temporary tensile force from being generated in the mooring line 11 or 21 is provided. According to the present invention, the problem of corrosion of mooring lines of a floating offshore structure is solved, the work of setting up mooring lines is facilitated, and the length of the mooring lines after the date and time has passed. Can be easily readjusted.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing a mooring line of a floating structure according to an embodiment. FIG. 2 is a process diagram showing a construction process of a mooring line of the floating structure according to the embodiment. FIG. 3 is an explanatory view showing a mooring line of a floating structure according to another embodiment. FIG. 4 is an explanatory view showing a mooring line of a conventional floating structure. FIG. 5 is an explanatory view showing a mooring line of a conventional floating structure. FIG. 6 is an explanatory view showing a construction method of a mooring line of a conventional floating structure. FIG. 7 is an explanatory view showing a manner of anchoring mooring lines of a conventional floating structure. DESCRIPTION OF SYMBOLS 1 Water area (ocean) 2 Water bottom 10 Floating structure 11 Mooring chains 12, 14, 22 Concrete anchors 13, 21 Mooring lines 15 Fixing bodies 16, 23 Fixing section 17 Fixing section 18 Fixing tool 19 Concrete covering 24 Insertion hole 31 Pilot wire 32 Buoy 33 Barge 34 Drum 35 Arrow 36 Crane 37 Diver

Claims (1)

(57) [Claims 1] In a mooring line for mooring a floating structure, an intermediate portion of the mooring line is movably locked to a concrete anchor at the bottom of the water, and both ends of the mooring line are floating. A mooring line for a floating structure, which is fixed to the structure.