JP3633218B2 - Mooring float for shallow water - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a moored floating body such as a floating jetty moored to a sinker on the seabed in shallow water.
[0002]
[Prior art]
Conventionally, as a method of mooring a floating body such as a floating jetty, the one shown in FIG. 3 is generally used, and the floating body 13 is moored by a mooring line 14 to a sinker 12 installed on the seabed. Yes.
[0003]
[Problems to be solved by the invention]
By the way, it is known that in shallow water, the wavelength of the incident wave to the floating body 13 is more than twice the water depth as a sea condition, so that the influence of the water depth is caused on the movement of the floating body 13.
In Fig. 4 , the left and right swing characteristics of the floating body 13 are shown on a wave period basis for 15 in the case of shallow water and 16 in the case of deep water. As is clear from the figure, the effect of shallow water (wavelength is the depth of water). If it is affected by 2 times or more), the left and right shaking of the floating body 13 becomes remarkably large.
[0004]
FIG. 5 shows mooring tension characteristics of the floating body 13. The tension of the mooring line 14 is shown based on the horizontal displacement of the floating body 13 in the case of shallow water 17 and the case of deep water 18.
As shown in FIG. 5 , in shallow water, since the water depth is shallow, the mooring line 14 becomes insufficiently slackened. As a result, the mooring line 14 is quickly tensioned together with the horizontal displacement of the floating body 13, and the tension is rapidly increased. It will increase. That is, the amount of horizontal movement of the floating body 13 decreases between the static load due to the drifting force and the maximum design load, which causes a rapid increase in the mooring line tension.
[0005]
As described above, it can be seen that as the water depth becomes shallower, the floating of the floating body 13 increases and the mooring tension increases.
Therefore, in the conventional simple mooring method, the operating rate of the floating body 13 (for example, the usage rate as a floating pier) is lowered, and there is a possibility that the mooring line 14 is cut off.
[0006]
The present invention is, for floating body which is moored in shallow water, by providing a means for suppressing the horizontal movement of the floating body, providing a shallow water for mooring floating that to prevent the generation of excessive tension on mooring lines of the same floating body The task is to do.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the moored floating body for shallow water according to the present invention is a floating body moored via a mooring cable to a sinker installed on the seabed in the shallow water, and can swing and deform as a chain from the floating body A horizontal motion resistor suspended from the seabed via a support member is provided , and the horizontal motion resistor is also formed of a chain, and the horizontal motion resistor is formed on the seabed so as to extend in the longitudinal direction of the floating body. It is characterized by being placed .
[0008]
In the moored floating body for shallow water according to the present invention described above, the horizontal motion resistor is suspended from a floating body such as a floating pier via a swingable deformable support member as a chain. Therefore, the horizontal motion of the floating body is supported by the support member. Thus, it is possible to appropriately suppress the occurrence of excessive stress in the, so that excessive tension is prevented from being generated in the mooring line of the floating body, and the mooring of the floating body can be performed safely.
[0009]
Moreover, the horizontal movement resistor also because it is formed by chain capable of sliding along the seabed, the chain effect of suppressing horizontal motion of the floating body by frictional resistance caused between the seabed to more accurately in To be done .
[0010]
As this, as the horizontal movement of said floating body is suppressed, the load burden on the mooring lines of the same floating body is reduced, the tension of the mooring lines is decreased, the cut accident is prevented.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
1 is a perspective view showing a mooring floating body for shallow water as one embodiment of the present invention, and FIG. 2 is a horizontal displacement and tension of a mooring line in the floating body of FIG. Ru graph der showing the relationship.
[0012]
As shown in FIG. 1, four corners of a floating body 1 such as a floating pier are moored via a mooring line (including a chain) 4 on a sinker 3 installed on the seabed in a shallow water area. Then, the chains 5 and 5 serving as horizontal motion resistors that suppress the horizontal motion of the floating body 1 are placed on the seabed so as to extend in the longitudinal direction of the floating body 1, and the chains 5 and 5 swing on the floating body 1. The chain 5a to 5e as the support members capable of dynamic deformation is suspended to the seabed, and the chain 5 as the resistor and the chains 5a and 5b as the support members are formed as a series of chains. In addition, the code | symbol 2 in FIG. 1 has shown the mooring cable attachment part, and the codes | symbols 6a and 6b have shown the chain attachment part.
[0013]
In the moored floating body for shallow water according to the present embodiment described above, the chain 5 as the horizontal motion resistance body is suspended from the floating body 1 via the chains 5a to 5e as swingable deformable support members. The movement is appropriately suppressed without excessive stress generation in the chains 5a to 5e as the support members, thereby preventing the generation of excessive tension in the mooring line 4 of the floating body 1, and the floating body 1 Mooring will be carried out safely. Then, a chain 5 as the horizontal movement resistor, as the flexible frictional resistance material since it is arranged so as to be able to slide along the seabed, the floating body 1 by the frictional resistance between the seabed at the same chain 5 The action of suppressing horizontal movement is more accurately performed.
[0014]
The mooring characteristic 7 in FIG. 2 shows the relationship between the horizontal displacement of the floating body 1 and the mooring tension. From this characteristic, when the conventional horizontal movement range is indicated by reference numeral 8 in the figure, the mooring tension is indicated by reference numeral 9. In this embodiment, the horizontal movement range of the floating body 1 is reduced as indicated by reference numeral 10, and the magnitude of the mooring tension is also reduced to the range indicated by reference numeral 11. That is, it is possible to reduce the tension applied to the mooring line 4 by reducing the horizontal movement of the floating body 1, thereby increasing the operating rate of the floating body 1 and preventing the mooring line 4 from being broken.
[0015]
【The invention's effect】
As described in detail above, the moored floating body for shallow water according to the present invention has the following effects. (1) from floating in the Floating Pier or the like which is anchored via mooring lines to the installed sinker to the seabed at shallow water, through a swinging deformable support member as a chain, suspended horizontal movement resistor, the horizontal movement resistor be constituted by chains, the horizontal movement resistor Runode produce is placed on the seabed seabed friction so as to extend in the longitudinal direction of the floating body, the horizontal movement of said floating body serving as the chain The support member is appropriately restrained without generating excessive stress, thereby preventing the generation of excessive tension in the mooring line of the floating body, so that the floating body can be moored safely. Become.
(2) Due to the horizontal movement of the upper Symbol floating body is suppressed, the load burden on the mooring lines of the same floating body is reduced, the tension of the mooring lines are reduced, become the cutting accident is prevented The operating rate of the floating body is also improved.
[Brief description of the drawings]
1 is a perspective view of a shallow water for mooring floating as an embodiment of the present invention.
FIG. 2 is a graph showing the relationship between horizontal displacement and mooring tension in the floating body of FIG.
FIG. 3 is a perspective view showing a mooring state of a conventional floating body for shallow water.
FIG. 4 is a graph showing the left-right swing characteristics of the floating body according to the depth of the mooring area on a wave period basis.
FIG. 5 is a graph showing the relationship between the horizontal displacement of the floating body and the anchoring tension.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Floating body 2 Mooring line attaching part 3 Sinker 4 Mooring line 5 Chains 5a-5e as horizontal movement resistance bodies (flexible friction resistance material) Chains 6a and 6b as swing-deformable supporting members Chain attaching part 7 Mooring characteristics 8 Horizontal movement range 9 Mooring tension range
10 Horizontal motion range
11 Mooring tension range

Claims (1)

In a floating body moored via a mooring line to a sinker installed on the sea floor in shallow water, a horizontal motion resistor suspended from the floating body to the sea floor via a swingable support member as a chain is provided , A mooring float for shallow water, wherein the horizontal motion resistor is also constituted by a chain, and the horizontal motion resistor is mounted on the seabed so as to extend in the longitudinal direction of the float.

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