JP2002030611A - Floating body structure and installing method of floating body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floating body structure capable of eliminating a level difference from a quay, eliminating inclination of a road, increasing a movable allowable load, saving energy for installing construction and reducing cost and an installing method of the floating body structure. SOLUTION: The floating body structure furnished with an upper surface deck and a floating body to support the upper surface deck is devised to provide a ballast part by connecting the upper surface deck and the floating body on both end parts in the longitudinal direction of the structure, making it possible to load ballast so that overall weight of the structure becomes heavy by buoyancy acted on the structure at the time of the highest water level on the ballast part and to suspend it between the quays forming installing grooves. This structure is installed by making a central part in the longitudinal direction upward in a protruded shape by buoyancy by pushing the both end parts on the installing grooves formed on the quays by the ballast.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating structure (hereinafter simply referred to as a floating structure) such as a bridge or artificial ground utilizing buoyancy installed between quays, and a method of installing the floating structure. .

[0002]

2. Description of the Related Art Conventionally, when a floating structure of this type is installed on a quay, the structure floated by buoyancy is moored with a wire rope or a rubber fender, and a pier is bridged between the quay and a pier. Was. According to this method, there is a problem that the structure moves up and down due to a change in water level, a step is formed between the structure and the quay, and the pier is inclined, and some means for correcting the step is required.

Further, the weight and buoyancy of the floating structure are balanced as a whole, but the allowable load for loading is small, and the stress and deflection of the floating structure due to the loading load increase, which greatly affects the installation state of the floating structure. There was an inconvenience.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a floating structure capable of eliminating a step with a quay, eliminating a slope of a passage, increasing a permissible load, saving labor for installation work, and reducing costs. It is an object of the present invention to obtain an installation method of an object and a floating structure.

[0005]

A floating structure having an upper deck and a floating body for supporting the upper deck, wherein a ballast portion is connected to the upper deck and the floating body at both ends in the longitudinal direction of the structure. The ballast portion can be loaded with ballast so as to increase the overall weight of the structure by the buoyancy applied to the structure at the highest water level, and can be bridged between the quays having the installation grooves.

[0006] In a floating structure having an upper deck and a floating body supporting the upper deck, a ballast portion is provided at both ends in the longitudinal direction of the structure so as to be connected to the upper deck and the floating body. The ballast is loaded so that the overall weight of the structure becomes heavier than the buoyancy applied to the structure at the highest water level, and both ends in the longitudinal direction of the structure are pressed against the installation grooves formed in the quay by the ballast, and the center in the longitudinal direction is generated by the buoyancy. The part was deformed upward and convex.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a state before installation of a floating structure of the present invention, and FIG. 2 is a view showing a state after installation. Reference numeral 1 denotes a floating structure, which is an upper deck 2
And a floating body 3 for supporting the upper deck 2.

Reference numeral 4 denotes a ballast formed at both ends in the longitudinal direction of the floating structure 1 and connected to the upper deck 2 and the floating body 3. The ballast part 4 constitutes a part of the upper deck 2 and may be formed by partitioning the inside of the upper deck 2. Ballast water or concrete is loaded into the ballast section 4 as ballast.

The ballast is loaded so that the overall weight of the floating structure 1 is larger than the buoyancy applied to the floating structure 1 at the highest water level so that the floating structure 1 does not float even at the highest water level. Make it possible.

The floating body 3 has a closed tank structure, and buoyancy is generated by air sealed in the tank structure. Reference numeral 5 denotes a quay where the floating structure 1 is installed. An installation groove 6 for receiving the floating structure 1 is formed in an upper portion of the quay walls 5.

In order to install such a floating structure 1, the floating structure 1 in a floating state is towed to the installation site and transported. Then, at a predetermined position on the quay 5, ballast is loaded on the ballast portions 4 at both ends,
As a result, the draft is lowered and the floating structure 1 is landed on the installation groove 6.

Even if the floating structure 1 is landed in the installation groove 6, the ballast is further loaded and the floating structure 1 does not float even at the highest water level. Increase the overall weight including ballast. As a result, both ends of the floating structure 1 are pressed and supported by the installation grooves 6, and are suspended and installed between the quay walls 5.

At this time, while the floating structure 1 is pressed against the installation grooves 6 at both ends, buoyancy acts on the central portion in the longitudinal direction, and a bending moment A is generated such that a tensile stress is generated on the upper surface of the upper deck 2. . Therefore, at the time of this initial installation, the floating structure 1 is deformed in a convex shape in the longitudinal direction of the upper surface. It goes without saying that the stress does not cause a problem in structure and safety.

Floating structure 1 thus installed
In addition, the load, moment, and stress that occur when a live load such as an automobile or railway vehicle is applied are the load at the time of initial installation,
Since the directions are opposite to the moments and the stresses, these are canceled. Therefore, it is possible to increase the allowable load with a margin in terms of strength and bending, or to improve safety in terms of strength.

In the installation, only ballast is loaded, and there is no need for ancillary equipment such as anchors and fenders for mooring, and no seabed construction is required as in the prior art. And can be safely installed in a short time.

Since the depth of the installation groove 6 of the quay 5 is adjusted to the depth corresponding to both ends of the floating structure 1, there is no step between the quay 5 and the floating structure 1. The floating structure 1
Although not shown, a joint passage member is provided between the floating structure 1 and the upper surface of the quay wall 5 because of the expansion and contraction and the bending, but the passage surface is largely inclined because there is basically no step. I will not do it.

[0017]

According to the present invention, the floating structure is stretched across the quay in such a shape that both ends in the longitudinal direction are pressed against the installation grooves by ballast, and the central portion in the longitudinal direction becomes upwardly convex due to buoyancy. Since it was installed, the steps between the floating structure and the quay were eliminated, and the slope of the passage was eliminated. In addition, the allowable load of the floating structure can be increased, the installation work can be saved, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a view showing a state before installation of a floating structure of the present invention.

FIG. 2 is a view showing a state after installation of the floating structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Floating structure 2 Upper deck 3 Floating body 4 Ballast part 5 Quay 6 Installation groove

Claims (2)

[Claims] 1. A floating structure comprising an upper deck and a floating body supporting the upper deck, wherein a ballast portion is provided at both ends in the longitudinal direction of the structure so as to be connected to the upper deck and the floating body. A floating structure, characterized in that the ballast can be loaded so that the overall weight of the structure becomes heavier than the buoyancy applied to the structure at the highest water level in the ballast part, and the ballast is bridged between the quay walls with installation grooves. . 2. A floating structure having an upper deck and a floating body supporting the upper deck, wherein a ballast portion is provided at both ends in the longitudinal direction of the structure so as to be connected to the upper deck and the floating body. The ballast is loaded so that the overall weight of the structure becomes heavier than the buoyancy applied to the structure at the highest water level, and both ends of the structure are pressed against the installation grooves formed on the quay by the ballast, and the buoyancy causes the central part in the longitudinal direction to rise. A method of installing a floating structure, wherein the installation is performed by deforming the convex structure upward.