JP2002339317A - Pontoon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pontoon controlling the rise of internal pressure, preventing the damage thereof and, at the same time, stably floating on the water. SOLUTION: The pontoon 1 forming a hollow section 1A inside thereof for floating the pontoon on the surface of the water is equipped with pressure adjusting means 20 and 22 for adjusting the internal pressure of the hollow section A. Discharging means 22 and 23 are provided to the pontoon 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pontoon for floating on water.

[0002]

2. Description of the Related Art It is known that a pier or the like adopts a system in which a pontoon is provided and a bridge is floated on the water instead of supporting the bridge on a seabed or a lake bottom with a pillar.

Conventionally, such a pontoon has a structure in which a main body is formed of concrete and a reinforcing bar for maintaining the strength of the main body, or a steel shell and a reinforcing bar are provided in the main body. Then, a hollow portion is formed inside the pontoon, and the buoyancy of air in the hollow portion is used to float on the water.

[0004]

However, when a hollow portion is provided inside, when the air temperature becomes high, the air inside the hollow portion expands. As a result, the concrete was sometimes damaged by the increase of the internal pressure. In addition, dew condensation may occur in the cavity due to a temperature change in the cavity. If the water due to the condensation accumulates in the cavity, the buoyancy of the pontoon is reduced.

The present invention has been made in view of such a problem, and provides a pontoon that suppresses an increase in internal pressure, prevents breakage, and stably floats on water.

[0006]

According to the present invention, there is provided a pontoon having a hollow portion formed therein for floating on a water surface and having pressure adjusting means for adjusting the internal pressure of the hollow portion. Adopted.

According to the present invention, it is possible to prevent the internal pressure of the cavity from rising. For this reason, the pontoon does not break due to an increase in internal pressure.

In the present invention, the pontoon preferably has a water reservoir for storing water in the cavity, and a drain means for discharging the water in the water reservoir to the outside of the floating body. .

According to the present invention, the buoyancy can be prevented from lowering by discharging water which is generated by dew condensation or the like and stays and accumulates in the hollow portion to the outside of the pontoon. Further, by discharging the water inside, the deterioration of the pontoon can be prevented.

Further, in the present invention, in the above pontoon, the discharging means is constituted by the pressure adjusting means and a communication path connecting the pressure adjusting means and the water reservoir.

According to the present invention, the drainage means can be provided by an extremely simple mechanism without providing a special unit such as a pump. Thus, the weight can be reduced, and the buoyancy of the floating body does not decrease. Further, the cost can be reduced.

According to the present invention, in the above pontoon, the pressure adjusting means is constituted by a check valve.

[0013] The check valve has an extremely excellent response for pressure control. Moreover, because of the simple structure,
Less failure.

According to the present invention, by employing such a check valve as the pressure adjusting means, the internal pressure of the pontoon is instantaneously adjusted, and damage is effectively prevented.

Further, by employing a check valve, communication between the check valve and the water reservoir can be easily performed. That is, by adopting the check valve, the hose or the pipe can be easily connected to the check valve, and the hose or the pipe having the communication path can be adopted as the communication path.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a floating bridge using a pontoon 1 according to one embodiment of the present invention. The floating bridge is provided for berthing the boat B, and is configured by connecting a plurality of pontoons 1 along the quay wall A. Each pontoon 1 is formed in a rectangular shape having a predetermined length in plan view, and each pontoon 1 has a longitudinal end connected to each other by a communication passage 3. In addition, columns 2 that prevent the pontoon 1 from being separated from the quay A are provided at both ends in the longitudinal direction of each pontoon 1 at positions corresponding to both side portions of the pontoon 1 in the width direction. .

2 to 5 show details of the structure of the pontoon 1. As shown in FIGS. 2 and 3, the pontoon 1 has a concrete main body 5 formed in a rectangular box shape, and a plurality of reinforcing bars 6 are formed on the main body 5 in a vertical and horizontal grid to maintain strength. Are arranged. This pontoon 1 is substantially entirely formed as a hollow portion 1A,
The pontoon 1 is given buoyancy. In the hollow portion 1A, reinforcing ribs 7 are provided along the inner wall of the concrete body 5.
Is provided. The reinforcing ribs 7 are formed by combining flat bars in a lattice shape.

At both ends of the pontoon 1 in the longitudinal direction, first supporting rollers 9 and 9 for preventing the pontoon 1 from separating in the longitudinal direction, and preventing the pontoon 1 from separating in the width direction. Second support rollers 11, 11
And third support rollers 12 and 12 are provided.

The first support rollers 9, 9 are rotatably mounted on support brackets 8, 8 projecting outward in the longitudinal direction from both ends in the width direction of the pontoon 1. The first support rollers 9 and 9 are vertically attached to the support brackets 8 and 8 so as to be parallel to the longitudinal direction of the pontoon 1. Contacting the opposing surface.

On the other hand, the second support rollers 11, 11 are rotatably mounted on a support bracket 10 projecting outward from the center of the end of the pontoon 1 in the longitudinal direction. The second support rollers 11, 11 support the support bracket 10.
The pontoon 1 extends vertically outward from the side surface of the pontoon 1 and is attached vertically, and its peripheral surface is in contact with the center surface of the side surfaces of the support column 2 facing each other.

The third support rollers 12, 12 are similarly mounted so as to protrude outward from the support bracket 10 in the width direction of the pontoon 1. The third support rollers 12, 12 are laid horizontally and attached so as to be orthogonal to the longitudinal direction of the column 2.

The first and second support rollers 9 and 11
Rotates along the longitudinal direction of the column 2 and the third support roller 12 rotates in the direction perpendicular to the longitudinal direction of the column to support the pontoon 1, so that the pontoon 1 responds to the rise and fall of the water level. While moving up and down with respect to the strut 2,
The pillar 2 prevents the separation from the quay A.

As shown in FIGS. 4 and 5, the pontoon 1 has a hollow interior and stores air for providing buoyancy. Check valves 20, 22 for adjusting the internal pressure are provided on one side wall 5a of the pontoon 1. On the side wall 5a, two pipes 21 and 23 communicating between the inside and the outside of the pontoon 1 are attached so as to penetrate the side wall 5a.
Outside the pontoon 1, they are attached to the ends of the pipes 21 and 23, respectively.

Further, the bottom of the pontoon 1 is
On the side, a portion protruding outward is formed, and the inside of this portion is configured as a water storage section 30 for storing water generated by condensation or the like in the cavity.

As one pipe 21 to which the check valve 20 is attached, a relatively short straight pipe is used. The pipe 21 is attached to the upper part of the pontoon 1 and its tip extends to a position almost directly above the water reservoir 30. ing. The check valve 20 attached to the pipe 21 is for taking outside air into the pontoon 1 when the internal pressure of the pontoon 1 decreases to a predetermined pressure, and prevents the internal pressure from lowering. The check valve 20 is a one-way valve that allows air to pass from the outside to the inside of the pontoon 1 but does not allow air to pass from the inside to the outside.

As shown in FIG. 5, inside the check valve 20, passages 24a and 24b communicating both ends are formed, and a check mechanism 25 is provided at an intermediate portion thereof. The check mechanism 25 includes a sheet surface 26 formed on the end side where the pipe 21 is not attached and the sheet surface 2.
6 and a poppet 27 pressed by a spring. According to the check valve 20, when a pressure difference equal to or higher than the spring force is generated between the outside air pressure and the pressure of the cavity 1A, the poppet 27 of the check valve 20 opens to take in outside air into the cavity 1A.

The other pipe 23 to which the check valve 22 is attached is curved downward inside the pontoon 1, and its tip is inserted into the water reservoir 30. Check valve 22 attached to this pipe 23
Prevents the internal pressure of the cavity 1A from rising more than a predetermined value. The check valve 22 is a one-way valve that allows air to pass from the inside to the outside of the pontoon 1 but does not allow air to pass from the outside to the inside.

Similarly, the check valve 22 is also provided with a check mechanism 25 composed of a seat surface 26 and a poppet 27 pressed against the seat surface 26 by a spring. The check valve 22 opens the poppet 27 when the pressure in the cavity 1A rises and the differential pressure generated between the outside air pressure and the pressure in the cavity 1A exceeds the spring force, releasing the pressure in the cavity 1A to the atmosphere. are doing. By this, Pontoon 1
The pressure increase in the cavity 1A in the inside is prevented, and the concrete constituting the main body 5 is prevented from being damaged.

The pontoon 1 has problems such as breakage due to pressure rise, loss of buoyancy due to pressure drop, and condensation due to temperature change. The pontoon 1 is
Drainage means for discharging water accumulated in the cavity 1A due to accumulation of dew condensation to the outside is employed.

In the pontoon 1, water generated by the accumulation of dew is stored in the water reservoir 30. As described above, the tip of the pipe 23 to which the check valve 22 is attached is inserted into the water reservoir 30. The check valve 22 and the pipe 23 function as drainage means.

Explaining the operation, the accumulated water is
Due to the action of surface tension, the inside of the pipe 23 rises and approaches the vicinity of the check valve 22. On the other hand, when a predetermined amount or more of water is stored in the water reservoir 30, the volume of the space decreases, and the pressure of the cavity 1A increases.
Thereby, the poppet 27 of the check valve 22 is opened, and the water stored in the pipe 23 is released to the outside. Similarly, when the temperature rises and the pressure in the cavity 1A rises, the water staying inside the pipe 23 is released from the check valve 22 to the outside.

As described above, the check valve 22 and the pipe 2
Reference numeral 3 also serves as a discharging means for discharging the water stored in the cavity 1A to the outside of the pontoon 1.

The case where the check valves 20 and 22 are used as the pressure adjusting means has been described above. However, the present invention is not limited to this, and another type may be used. A relief valve may be provided instead of the check valves 20 and 22. Also, without providing a valve, for example, a small window is formed in the pontoon 1 and the small window is closed with a stopper. Then, the internal pressure may be adjusted by removing the stopper at regular intervals.

On the other hand, the drainage means is not limited to the above-described one. For example, a configuration may be adopted in which a pump is provided in the pontoon 1 and the pump pumps out water accumulated in the hollow portion 1A.

As described above, the floating bridge having the pontoon itself as a main body has been described as an example. However, as shown in FIG.
The pontoon 51 may be provided with a pressure adjusting means and a discharging means. In addition, the use of the pontoon is not limited to the floating bridge, and it goes without saying that the pontoon can be applied to other uses such as a workbench on the water and a large floating dog.

[0037]

As described above, according to the present invention, the settlement of the pontoon can be prevented, and the damage due to the abnormal increase of the internal pressure can be prevented by a simple mechanism. In addition, by releasing moisture remaining inside due to dew condensation to the outside, deterioration of the pontoon is effectively prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing an installation state of a floating bridge using a pontoon according to an embodiment of the present invention.

FIG. 2 is a plan view of a pontoon used in the floating bridge shown in FIG.

FIG. 3 is a side view of the pontoon of FIG. 2;

FIG. 4 is a cross-sectional view of the pontoon.

FIG. 5 is a schematic structural view of a pontoon.

FIG. 6 is a perspective view showing a pontoon according to another use mode different from the pontoon shown in FIG. 1;

[Explanation of symbols]

 1, 35, 51 Pontoon 1A, 35A Cavity 2 Column 3 Communication passage 9, 11, 12 Support roller 8, 10 Support bracket 20, 22 Check valve 21, 23, 36 Pipe 30, 38 Water reservoir 37 Cover 40 Main body 50 Floor plate

Claims (4)

[Claims] 1. A pontoon having a cavity formed therein for floating on a water surface, and comprising pressure adjusting means for adjusting an internal pressure of the cavity. 2. The pontoon according to claim 1, further comprising a water reservoir for storing water in the cavity, and a drainage means for discharging water in the water reservoir to the outside of the floating body. 3. The method according to claim 2, wherein the discharging unit includes the pressure adjusting unit,
3. The pontoon according to claim 2, wherein said pontoon is constituted by a communication path connecting said pressure adjusting means and said water reservoir. 4. The pontoon according to claim 1, wherein said pressure adjusting means comprises a check valve.