JPH07122248B2 - How to install a movable breakwater - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable breakwater provided with, for example, a flow passage for a ship to pass through and a door body for opening and closing the flow passage, at a port or a fishing port in a short time. Regarding a method that can be installed quickly.

[0002]

2. Description of the Related Art In harbors and fishing ports, fixed breakwaters are constructed from both sides of the harbor in order to protect ships and harbor facilities moored in the harbor from high waves such as waves and tsunamis. While preventing waves from entering directly and allowing ships to freely enter and exit the port from the entrance between both fixed breakwaters, this allows high waves to enter the bay from the entrance and exit, and May cause damage.

Therefore, it is considered to attach a door body to the entrance and exit, but conventionally, when attaching the door body,
First, a number of sheet piles are driven into the seabed at the planned mounting position to form a surrounding wall, and after discharging the seawater in the surrounding wall, concrete is cast into the seabed inside the surrounding wall to form the bank body, A door was attached to the main bank.

[0004]

The above-mentioned conventional door body mounting method has the drawbacks that the construction period at the mounting site is long, the construction cost is high, and the navigation of ships near the construction site is restricted for a long period of time. is there.

In view of the above-mentioned conventional drawbacks, the present invention has an object of proposing a method of installing a movable breakwater capable of quickly installing a door at a predetermined position in a short period of time.

[0006]

In order to achieve the above-mentioned object, the present invention has a structure in which a pair of side wall portions are integrally formed on both side edges of a bottom wall structure so as to be surrounded by the three wall portions. A movable breakwater is constructed on land, which comprises a bank main body having a substantially U-shaped cross section in which a road is formed in the central part, and an opening / closing drive device for a door body which is openably and closably attached to the bank main body. It is characterized in that it is installed in a predetermined position after the breakwater is circulated or towed.

[0007]

In the above structure, for example, when the door body is attached to the entrance provided between the fixed breakwaters, the main body of the dam is formed by a land caisson yard or dry dog, and the door body is opened and closed on the main body of the breakwater. A movable tide embankment will be constructed by installing the equipment, and as a parallel work, the foundation work for the installation will be performed at the planned location of the movable tide embankment. next,
After circling or towing the above-mentioned movable breakwater, the movable breakwater is installed at the entrance between the fixed breakwaters and integrated with the foundation by underwater concrete.

[0008]

1 and 2 show a state in which a movable seawall 1 according to an embodiment of the present invention is installed at a doorway 3 provided between fixed seawalls 2. Is
The bank main body 4 has a substantially U-shaped cross section, a door body 5 is attached to the bank body 4 so as to be openable and closable, and an opening / closing drive device 6 for the door body 5.

The bank main body 4 includes a bottom wall portion (an example of a bottom wall structure) 4a in which concrete is cast in a temporary frame, and a pair of side walls integrally projecting from both side edges of the bottom wall portion 4a. Part 4b,
4c, and a flow passage 7 for a ship to pass through is formed between the three walls 4a to 4c.

The side wall portions 4b and 4c are composed of wide side wall body portions 8 and 8 facing the inner side of the bay and narrow side wall tip portions 9 and 9 facing the open sea side. , 9, the door body 5 is arranged.

The door body 5 has a bearing portion 1 provided at a corner portion between the side wall body portions 8 and 8 and the side wall tip portions 9 and 9.
0 and 10 are rotatably supported by pivot shafts 11 and 11 so that they can be erected up and down, and are normally housed in the recess 12 of the bottom wall portion 4a (see the solid line in FIG. 1). Then, the flow passage 7 is closed (see the phantom line in FIG. 1).

The opening / closing drive device 6 includes two side wall body parts 8,
8 and a pair of cylinder devices 13, 13 and piston rods 13a, 1 of the respective cylinder devices 13, 13.
3a is a guide member 14, 1 provided at the tip of the rod.
Guide frames 15, 15 that support horizontally via 4
And the rod end portions of the piston rods 13a, 13a are connected to the door body 5 via the connecting rods 17, 17.
Is connected to brackets 16 and 16 projecting from the tip end side of the cylinder device.
Is driven, the rod tip end portions of the piston rods 13a, 13a move to the left side in the figure along the guide frames 15, 15, and the door body 5 is erected via the connecting rods 17, 17 (see the phantom line in FIG. 1). ), When the cylinder devices 13, 13 are driven in reverse from the standing state of the door body 5, the piston rod 1
The rod tips of 3a and 13a move to the right side in the figure along the guide frames 15 and 15, and the door body 5 is tilted through the connecting rods 17 and 17 (solid line state in FIG. 1). In FIG. 1, 1
8 is an opening / closing drive device 6 constructed on the side wall body portions 8 and 8.
A casing 19 for covering the side wall body portions 8, 8 is a groove formed on the upper surface of the side wall body portions 8, 8;
This is to prevent hitting 8.

Explaining how to install the movable seawall 1, concrete is placed in the temporary frame body of the bottom wall 4a and the side walls 4b, 4c by a caisson yard or dry dog on the ground. 4, a door body 5 and an opening / closing drive device 6 for opening and closing the door body 5 are attached to the bank main body 4 to construct the movable seawall 1.

In this case, since the construction work is performed on land with a good scaffold, it is excellent in terms of safety, workability and economy. In addition, at the planned installation location of the movable seawall 1, in parallel with the above-mentioned construction work, foundation work for installation will be performed at the entrance / exit 3 of the fixed seawall.

Next, the movable seawall 1 is floated on the sea surface. As a method for floating it, a floating body may be attached to the movable seawall 1, but as shown in FIGS. 3 and 4, a water stop door 20 is provided on a bay inner end surface of the bank main body 4 and a connecting means 21 such as a turnbuckle. When the door body 5 is erected and both end openings of the flow passage 7 are closed, the bank main body 4 itself can be easily made into a floating structure.

Subsequently, the movable sea tide 1 is circulated or towed to the installation position using a floating crane, a barge or a floater, and then the movable sea tide 1 is positioned at the entrance / exit 3 of the fixed breakwater 2. Then, the valve 23 with the handle 22 provided on the water shutoff door 20 may be opened, and the movable seawall 1 may be submerged and installed on the sea surface. After the installation, the water stop door 20 is removed from the movable seawall 1, the concrete is placed between the main body 4 of the seawall and the fixed seawall 2, and the movable seawater 1 is fixed to the fixed seawall 2.
Integrated with.

In this case, the work period at the installation site is 2
It can be installed in places where it is difficult to carry out long-term on-site work because the sea conditions and weather conditions are bad because it takes only 3 days. In the above embodiment, the bottom wall portion 4a of the bank main body 4 was concrete-placed on land. However, the bottom wall portion 4a of the temporary assembling bottom wall portion (one example of the bottom wall structure) before the concrete was towed or turned around. Alternatively, the bottom wall portion 4a may be formed by placing concrete on the temporary assembly bottom wall portion at the installation site. Further, although the door body 5 is also mounted on land, it can be transported separately and mounted on the installation site.

[0018]

EFFECTS OF THE INVENTION According to the present invention, a movable tide wall consisting of a levee body, a door and an opening / closing drive device is preliminarily constructed, and it is circulated or towed to the installation site for installation. It can be completed quickly in a short time, the construction cost can be reduced, and the period for restricting the navigation of the ship near the construction site can be extremely short.

It can also be easily attached to an existing fixed breakwater.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a state in which a movable seawall according to an embodiment of the present invention is installed at an entrance of a fixed breakwater.

FIG. 2 is a plan view of the same.

FIG. 3 is a plan view showing a rounding or towing state of the movable seawall.

FIG. 4 is a vertical sectional view of the same.

[Explanation of symbols]

 1 Movable seawall 4 Main body 4a Bottom wall 4b Side wall 4c Side wall 5 Door body 6 Opening / closing drive device 7 Flow path

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Ono 5-3-8 Nishikujo, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (72) Kenichi Hirayama, Nishikujo 5-chome, Konohana-ku, Osaka City, Osaka Prefecture 3-28 Hitachi Shipbuilding Co., Ltd. (72) Inventor Tozaburo Sato 5-3-28 Nishi Kujo, Konohana Ward, Osaka City, Osaka Prefecture (3) In Hitachi Shipbuilding Co., Ltd. (72) Akira Kadono West, Konohana Ward, Osaka City, Osaka Prefecture 5-3, Kujou, Hitachi Hitachi Zosen Co., Ltd. (56) References: 5-30225 (JP, U)

Claims (1)

[Claims] 1. A bottom wall structure having a pair of side wall portions integrally projecting from both side edges thereof, so that a flow passage surrounded by the three wall portions is formed in the central portion and has a substantially U-shaped cross section. A feature is that a movable breakwater including a bank main body and a door opening / closing drive device that is openably and closably attached to the bank is constructed on land, and the movable breakwater is circulated or towed and then installed at a predetermined position. How to install a movable breakwater.