JPH058301B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing a caisson used for a breakwater in a port, a framework for a quay, etc.

(Prior Art) Conventionally, when constructing this type of caisson, there is a method in which a floating dock (also called a floating dock) is always kept floating on the water and the caisson is built on top of that.

However, this method has the disadvantage that when pouring concrete to fabricate the caisson lower frame on a floating dock, the strength of the concrete may be adversely affected, especially in the first lot, as it gets caught in the waves. It had

However, in order to reduce the above-mentioned drawbacks, a large floating dock with extremely high rigidity is required, which poses a problem in that it requires a large amount of cost for manufacturing, maintenance, towing, etc.

In addition, if a caisson is constructed using a floating dock, on days with strong winds and waves, not only will it have a negative effect on the strength of the concrete, but the shaking will make the work dangerous, and in many cases, the work will be impossible. The drawbacks were that it was not easy to use, and the number of working days could be extended.

However, as shown in Fig. 5, another method for dealing with wind and waves is to make a mound 7 of a predetermined depth on the bottom of the water near the land, place the dock 8 on top of it, and then build the caisson body 1'. or 6th
As shown in the figure, there is a manufacturing method in which the caisson body 1' is directly attached to the bottom of the mound 7.

However, this construction method had drawbacks such as the time and expense required to create and remove the mound, and the mound could not be moved in an emergency.

(Object of the Invention) The object of the present invention is to eliminate the above-mentioned drawbacks, to sink part or all of a caisson body as a temporary mound, and to complete another caisson body on a dock on the temporary mound. After letting
To provide a method for manufacturing a caisson that is economical, safe, and allows work to be carried out quickly because the temporary mound is floated and the temporary mound is also used as a main structure.

(Means for solving the problem) Examples of the present invention will be described below with reference to the drawings.

In the present invention, first, as shown in FIG. 1, a first box 2a of a box-shaped caisson body having an open upper part and a chamber a, that is, a portion corresponding to the lower frame of the caisson body is manufactured. . This height has the height required for a temporary mound. In addition, the first box 2a can be manufactured using nearby equipment and towed, or it can be manufactured on land or in a floating dock to a height that provides the necessary buoyancy, and then it can be manufactured on water to the required height. Possible cases include adding concrete. In addition, the first
Although the box 2a is a part of the caisson body, it may be the entire caisson body.

Next, as shown in FIG. 2, the launched first box 2a is sunk into the water bottom 4, and is used as a temporary mound. Note that 3 in Figures 1 and 2 is a lid provided at the upper opening of the first box 2a, and this lid 3 is used when the height of the first box 2a is insufficient. , its thickness can be adjusted to obtain a predetermined height, and it can also be used as a height adjustment plate.

Next, when manufacturing the caisson lower body 1a, as shown in FIG. 3, the dock 5 is installed on a temporary mound, and the caisson lower body 1a is manufactured thereon.

Thereafter, when the caisson main body 1 reaches a predetermined height, it can be separated from the temporary mound, that is, the first box 2a, and towed to a predetermined location.

As shown in FIG. 4A, after use as a temporary mound, the water inside the first box 2a is drained through the drain pump 6, etc., and the lid 3 is floated as shown in FIG. If the height of the completed caisson is insufficient after removing it, use this first box 2.
A is used as a caisson lower body, and a caisson upper body 2b is built one after another to supplement the height above it, and another caisson body 2 is completed and used as the body of the target structure. Therefore, according to this construction method, the temporary mound can be used as the main body immediately, so there is no waste of materials, equipment, etc.

(Effects of the Invention) As described above, according to the present invention, part or all of the caisson body is sunk to the bottom of the water as a temporary mound, and after manufacturing the required number of caisson bodies on the dock installed on the temporary mound, the The caisson itself was completed by adding the missing height as needed on top of the temporary mounded caisson, and used as the main body of a structure such as a breakwater. (a) Large-scale equipment like the conventional floating dock There is no need to do this, which can save you a lot of money.

(b) The cost and effort required to make conventional mounds will be increased.

(c) A caisson is used as a temporary mound, and since it is movable, it can be easily floated and moved in an emergency.

(d) Can be made to any depth as required.

(E) Since the temporary mound also serves as part or all of the caisson body, it is economical as special equipment and extra materials can be omitted.

(F) Since docks are also used, there is no problem with the adverse effects of waves on concrete strength or the dangers of strong winds and waves.

There are various advantages such as

[Brief explanation of drawings]

1 to 4A and 4B are explanatory diagrams showing the manufacturing process of a caisson according to the present invention, and FIGS. 5 and 6 respectively show a conventional example. 1, 2... Caisson main body, 1a... Caisson lower frame, 2a... First box of caisson main body, 3...
...Lid, 4...Bottom, 5...Dock.

Claims (1)

[Claims] 1 Prefabricate part or all of the caisson body that also serves as a temporary mound from nearby equipment, land or a floating dock, cover the top of it, sink it in the designated place, install the dock on top of it, and After making another caisson until it reaches the desired height,
A method for manufacturing a caisson, comprising floating a part or the whole of the caisson body used as a temporary mound, removing the lid, and using the caisson body as the caisson body.