JPH092380A - Method for launching prestressed concrete hybrid pontoon - Google Patents

Abstract

PURPOSE: To provide a prestressed concrete hybrid pontoon launching method which is capable of docking a ship or a marine structure in a dry dock, and dispenses with a marine crane or hoisting metal fittings. CONSTITUTION: After a prestressed concrete hybrid pontoon 5 is built on a pontoon barge 4 arranged on a base in a dry dock 1, water is poured in the dry dock 1 to make the pontoon barge 4 afloat and shifted, and then, the water in the dry dock 1 is discharged to land the pontoon barge 4 on blocks in the dock 4. A pumping means of the pontoon barge 4 is opened, and water is poured into the dry dock 1 to make only the prestressed concrete hybrid pontoon 5 afloat and launched.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for launching a prestressed concrete hybrid pontoon using a submerged pontoon.

[0002]

2. Description of the Related Art Conventionally, there are mainly the following three methods for prestressed concrete hybrid pontoons (hereinafter referred to as PC hybrid pontoons). Hoisting and launching method P. The hybrid pontoon made by C will be built in the quay yard on land, and after completion, it will be lifted and launched by a sea crane.

Accordingly, it is necessary to remove and repair each of these members after mounting, reinforcing, and launching a hanging metal object that can withstand its own weight of 300 tons. Of course, a sea crane is also required. On the other hand, if it exceeds 300 tons, the cost of the crane and the cost of the hanging hardware become too large, so that the construction is usually done in the dock.

Construction method in dry dock Usually, a large P. The hybrid pontoon made by C is constructed by this method. Of course, if there is enough space, we will build a small one. As with the ship, the launch will be carried out by pouring water into the dock after the completion. Launching method using a sinking-type barge P. on a floating dock type barge floated on the sea C
After constructing a hybrid pontoon made of P.O. A hybrid pontoon made of C is floated and launched. The barge to be launched by this method requires a means for pouring and draining ballast water, a remotely displayed tank and a draft meter. In addition, mooring wharves and mooring facilities exclusively for barges are required.

[0005]

DISCLOSURE OF THE INVENTION The present invention not only allows docking of ships and marine structures into a dry dock at any time, but also, as mentioned above, the P. It is an object of the present invention to provide a hybrid pontoon launch method manufactured by C.

[0006]

Means for Solving the Problems That is,
The hybrid pontoon launching method made by C.P. is carried out on a box-type carrier mounted on a mount in a dry dock. After constructing a hybrid pontoon made of C, water is poured into the dry dock to float and shift the box-type pontoon, and then water in the dry dock is drained to attach the box-type pontoon to the board in the dock. The bottom of the box-type ship is then opened, while the water injection / drainage means of the box-type ship is opened, while water is injected into the dry dock. Only the hybrid pontoon made by C is floated and launched.

[0007]

[Operation] In this way, on the frame installed in the dry dock,
After arranging the box-type pontoon having the pouring / draining means, P. After constructing a hybrid pontoon made of C, and then pouring water into the dry dock to float and shift the box-type pontoon, drain the water in the dock and place the box-type pontoon on the board in the dock. After bottoming and then opening the water injection / drainage means of the box-type barge, water was injected again into the dock to inject water. C
By floating and launching only the manufactured hybrid pontoon, not only can ships and marine structures be docked in the dry dock at any time, but also a sea crane or the like becomes unnecessary.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the gantry 2 installed in the dry dock 1
After arranging the box-type pontoon 4 with the board 3 interposed therebetween, the P.P. Build C hybrid pontoon 5.

As shown in FIG. 2, the box-type barge 4 is installed on the dock head 1a, and the loading of members, materials, etc. is centered around a 3-ton crane or a 6-ton crane, and a 20-ton crane or a 50-ton crane. Using. When the repair ship 6 is busy repairing, the dock head 1a is used for loading by a tow truck. In addition, concrete is poured from the dock head 1a by piping from the pump car. In addition, in FIG. 2, reference numeral 7 indicates a dock gate.

On the other hand, the box-type barge 4 is shown in FIG. 3, FIG. 4 and FIG.
As shown in FIG. 3, it is divided into three independent chambers 4a, 4b, 4c, and a plurality of pouring / draining holes 9 having valves (not shown) are provided on the upper deck 8 of each chamber 4a, 4b, 4c (in the case of the figure, (2 pieces), and a plurality of pouring / draining holes 11 (two pieces in the case of FIG. 1) provided on the bottom 10 of the ship, each having a valve (not shown).
Is provided.

The above P. C made hybrid pontoon 5
After the construction is completed, as shown in FIG. 6, water is poured into the dry dock 1 to float the box-type carrier 4 from the mount 2, and then the box-type carrier 4 is shifted from the mount 2 as shown in FIG. Next, as shown in FIG. 8, the water in the dock 1 is drained, and the box boat 4 is placed on the board 13 installed in the dry dock 1. Then, as shown in FIG. 9, when the drainage in the dry dock 1 is completed, the pouring / draining holes 9 and 11 of the box type boat 4 are opened.

Thereafter, as shown in FIG. 10, when water is again poured into the dry dock 1, as the water level rises, water is poured from the water pouring / draining hole 11 into the box-type carrier 4, and as shown in FIG. ． Since only the C hybrid pontoon 5 made of C floats from the box-type carrier 4, The hybrid pontoon 5 made of C is pulled out from the dock 1. Next, as shown in FIG.
After draining the water in the dry dock 1 again, the pouring / draining holes 9 and 11 of the box carrier 5 are closed for ballast adjustment.

Then, as shown in FIG. 13, when water is poured into the dry dock 1, the box-type carrier 4 floats. Therefore, the box-type carrier 4 is moved, and as shown in FIG. Install the berth 4. After the installation, the pouring / draining holes 9 and 11 of the box-type carrier 4 are opened, and a new P. Construction of C hybrid pontoon begins.

[0014]

As described above, according to the present invention, the P.O.R. is mounted on a box-type carrier which is arranged on a mount in a dry dock. After constructing a hybrid pontoon made of C, water is poured into the dry dock to float and shift the box-type pontoon, and then water in the dry dock is drained to attach the box-type pontoon to the board in the dock. The bottom of the box-type ship is then opened, while the water injection / drainage means of the box-type ship is opened, while water is injected into the dry dock. Only the hybrid pontoon made by C will be floated and launched, so it is possible to
Not only is it possible to dock an offshore structure, but it is also possible to eliminate the conventional drawbacks.

That is, a sea crane is unnecessary (250 to 300 tons /
1). Moreover, it is not necessary to attach, reinforce or remove the lifting metal fittings. The construction cost is much lower than the conventional sinking type barge. Almost no ballast adjustment is required on the ship itself and it is easy to handle (safe).

No new construction or modification of the quay is required. There is no hindrance to the conventional construction process (ship repair, etc.) in the dry dock. When docking a very large ship, the barge is temporarily levitated and docked. Since it is launched inside the dock, it is not affected by weather and sea conditions (it is safe).

[Brief description of drawings]

Figure 1: P.P. on a pedestal installed on a gantry in the dock. It is explanatory drawing under construction of the hybrid pontoon made from C.

FIG. 2 is a plan view of the dock.

FIG. 3 is a plan view of a barge.

FIG. 4 is a side view of a barge.

FIG. 5 is a front view of a barge.

FIG. 6 is an explanatory diagram showing a state in which the pontoon has floated.

FIG. 7 is an explanatory diagram in which a pontoon is shifted.

FIG. 8 is an explanatory view showing a state in which the pontoon is installed on the board of the dock.

FIG. 9 is an explanatory view in which a valve of the ship is opened.

FIG. 10 is an explanatory diagram of pouring water into the dock to float the pontoon.

FIG. 11 is an explanatory view of a pontoon outlet.

FIG. 12 is an explanatory diagram showing drainage in a dock.

FIG. 13 is an explanatory view of the levitation of a barge.

FIG. 14 is an explanatory diagram in which the valve of the barge is opened after installation.

[Explanation of symbols]

1 Dry Dock 2 Stand 4 Box-type Table 5 Pontoon 13 Wood 9, 9

Claims (1)

[Claims] 1. A hybrid pontoon made of prestressed concrete is constructed on a box-type carrier arranged on a mount in a dry dock, and then water is poured into the dry-dock to float and shift the box-type carrier, and then, Pre-stressed concrete is poured into the dry dock while water is drained from the dry dock to allow the box-type ship to bottom on the board in the dock, and then the pouring and draining means of the box-type ship is opened. A method of launching a hybrid pontoon made of prestressed concrete, characterized in that only the made hybrid pontoon is floated.