JPS58194688A - Floating dock in parallel use for cargo transportation - Google Patents

Abstract

PURPOSE:To use a floating dock for marine transport, by providing end part partitioning compartments, equipped with openings communicated to the external water, to both sides of the floating dock and reducing longitudinal bending moment due to a wave. CONSTITUTION:End part partitioning compartments 4 are formed to both ends of a floating dock 1 and can be communicated to the external water by openings 5. An effective length for a wave 2 becomes LE by opening of the opening 5, and longitudinal bending moment can be reduced. At use as the floating dock, the openings 5 are closed and the effective length becomes LA, then a function as the floating dock can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a floating tonnage, and more particularly to a floating dock that can also be used for cargo transport, and which can also be used to transport cargo by sea.

Floating docks have traditionally been used for the repair and construction of ships, but recently, floating docks are also being considered for use in maritime transportation of cargo such as arrow-shaped structures.

Currently, the longitudinal strength of a floating dock is designed in consideration of the vertical bending moment generated by a docked ship, adjusting ballast water, etc. in the state of use as a floating dock, that is, in flat water.

However, as mentioned above, in the case of floating docks that are also used for maritime transport of cargo, it is necessary to consider not only the vertical bending moment in normal water but also the vertical bending moment caused by waves during the voyage. The central cross-sectional modulus required for strength increases dramatically.

The vertical bending moment due to waves is determined by the length of the floating dock, but if the length of the floating dock is shortened to reduce the vertical bending moment, the dimensions of the loaded cargo and the docked ship are limited by the length of the floating dock, and its general purpose sexuality will decrease.

Also, if you try to secure the required central cross-sectional coefficient by increasing the depth of the floating dock without reducing its length, it will require a greater water depth when used as a floating dock. There will be restrictions on where it can be used.

Due to its versatility in use, floating docks should be kept for as long as possible.
In addition, it is preferable to keep the depth as small as possible, but if you use a conventional floating dock and forcibly increase the length or reduce the depth, the weight of the hull will increase significantly and the construction cost will increase accordingly. There is a problem that the price increases as time goes on.

The present invention attempts to solve these problems by making it possible to use it for sea transportation of cargo by simple means while maintaining its original function as a floating dock. The purpose is to provide a floating dock that can also be used for cargo transportation.

For this reason, the cargo-carrying type floating dock of the present invention is suitable.

It has a buoyancy chamber in its center, and end compartments partitioned by partition walls at both ends, and an opening communicating with the outside water is formed in the outer panel forming these end compartments. It is characterized by

As mentioned above, in the cargo transport type floating dock of the present invention,
Openings that communicate with the outside water are formed in the outer panels of the front and rear compartments, so the buoyancy of each compartment is eliminated, and
The external force of waves acting on each compartment is reduced, thereby reducing the vertical bending moment acting on the center of the floating dock, and the local strength of the floating dock is sufficiently maintained during sea transport of cargo. The necessary buoyancy is provided in the center.

Further, the original function of the floating dock can be sufficiently maintained, and if necessary, the opening can be closed in a watertight area to further ensure buoyancy.

In this way, according to the present invention, the length of the floating dock can be increased to a sufficient size without unnecessarily increasing the longitudinal strength of the floating dock.

It is possible to realize a floating dock that can be used for cargo transportation at an economical cost while maintaining performance and strength. I will explain by comparing.

Figures 1 and 2 show the state in which the vertical bending moment due to waves is at its maximum when a conventional floating dock navigates the ocean. When the floating dock 1 reaches the trough of wave 2 as shown in Figure 2, and when it climbs onto the crest of wave 2 as shown in Figure 2, when the length of floating dock 1 matches the wavelength, vertical bending due to the buoyancy distribution f moment becomes maximum.

Since the conventional floating dock 1 has buoyancy over its entire length, the length of the vertical bending moment becomes longer, and the vertical bending moment at the center of the floating dock 1 becomes stronger.

Therefore, in the cargo transport type floating dock of the present invention, as shown in Fig. 4 (
As shown in FIG. 5 (view from the V-■ arrow in FIG. 4), a buoyancy chamber 1a is provided in the center of the floating dock 1, and ends partitioned by partition walls 3 are provided at both ends of the buoyancy chamber 1a. The end compartments 4 are provided with a large number of openings 5 in the outer panel forming the end compartments 4, which communicate with outside water.

These openings 5 are appropriately distributed so that the vertical fluid force that each end compartment 4 receives from waves can be minimized.

In this way, in the floating dock according to the present invention, each end compartment 4 at both ends loses its buoyancy, and the required buoyancy is obtained in the buoyancy chamber 1a in the center. As shown in Figure 3, the buoyancy distribution f occurs only in the central buoyancy chamber 1a, and the effective length LB for waves 2
This reduces the vertical bending moment caused by waves, which is significantly advantageous in terms of strength, and therefore has the advantage of greatly reducing the amount of steel required.For cargo loading, the overall length LA is shorter than in the conventional case. Since the buoyancy chamber 1a in the center can be moved without any change, it is possible to install and support cargo without any problems.Also, when used for its original purpose as a floating dock, the buoyancy of the buoyancy chamber 1a in the center can support a docked ship. If necessary, each opening 5 may be provided with a watertight boundary to restore the buoyancy of each end chamber 4.

As detailed above, according to the cargo transport type floating dock of the present invention, a buoyancy chamber is provided in the center thereof, and end compartments are provided at both ends thereof, each partitioned by a partition wall. It has a simple structure in which the outer panels that form the compartments have openings that communicate with the outside water, and while maintaining its original function as a floating dock, it is also strong enough to be used for cargo transportation. It has the advantage of being highly reliable and safe to use.

[Brief explanation of drawings]

Figures 1 and 2 are both side views showing the distribution of buoyancy in the waves of a conventional floating dock, and Figure 3 is the distribution of buoyancy in the waves of the floating dock of the present invention, which can also be used for cargo transportation. FIG. 4.5 shows a cargo transport type floating dock as an embodiment of the present invention. FIG. 4 is a side view thereof, and FIG. 5 is a sectional view taken along the line ■-■ in FIG. 4. ■... Floating dock, 1a... Buoyancy chamber in the center. 2. Waves, 3. Bulkhead, 4. End compartment. 5. Opening 1. f... Buoyancy distribution, L... Length, LA...
Total length, effective length. Sub-Agent Patent Attorney Yoshihiko Iinuma Figure 3 Figure 4

Claims (1)

[Claims] A buoyancy chamber is provided in the center of the floating dock, and end compartments are provided at both ends, each separated by a partition wall.
5. A floating dock for cargo transportation, characterized in that openings communicating with outside water are formed in the outer panels forming these end compartments.