JPH0552373B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a method for installing a caisson, and more particularly to a method for installing a caisson floating on the water surface to a submerged mound shallower than its stuttering water.

Conventional technology and its problems When installing a caisson floating on the sea surface on an underwater mound, if the water depth of the mound is shallower than the caisson's swamp, it is impossible to move the caisson above the mound while it is floating on the sea surface. It is possible. For this reason, in the past, a crane ship was usually used to lift the caisson slightly above the mound and move it above the mound. However, with this method, it is impossible to install a large caisson that exceeds the capacity of a crane, especially on a mound in shallow water.

An object of the present invention is to solve the above-mentioned problems and provide a caisson installation method that allows a large caisson to be installed on a shallow underwater mound.

Means for Solving the Problems The caisson installation method according to the present invention is a method of installing a caisson floating on the water surface on a bottom mound that is shallower than its stuttering water, and in which a floating body with adjustable ballast is attached to the caisson. The caisson is supported from both sides by the buoyant body by being disposed on both sides, and the engaging members on both sides of the caisson are engaged with the engaging members on the side of the buoyant body, so that the caisson's water depth is smaller than the water depth of the mound. , lifting the caisson by the buoyant body, moving the caisson and the buoyant body so that the caisson is located directly above the mound, and lowering the buoyant body so that the caisson lands on the mound. It includes.

The number of floating bodies placed on both sides of the caisson is arbitrary.

EXAMPLE An example of a caisson installed by the method of the invention and a buoyant body used to carry out the method of the invention is shown in FIGS. 1 and 4-6.

The caisson 10 is made of concrete, for example.
Forms a long box shape from front to back. A plurality of downward hooks (engaging members) are provided at the bottom of both sides of the caisson 10.
11 is fixed in an embedded manner.

The buoyant body 12 is made of steel, for example, and has a box shape that is long from front to back. A plurality of horizontal rods (engaging members) 13 that engage the hooks 11 of the caisson 10 from below are fixed via brackets 14 to the lower part of one side of the buoyancy body 12. A fender 15 is attached to the lower part of this side surface excluding the rod 13 and to the upper part. Furthermore, the buoyant body 12 is equipped with a seawater ballast filling and drainage device, and the ballast can be adjusted using this.

Next, with reference to FIGS. 1 to 3, a first method of installing the caisson 10, that is, a method of the present invention, will be described.
Explain an example.

First, the above caisson 10 and two buoyant bodies 12
While floating on the sea surface L, move it to the vicinity of the submarine mound by appropriate means. Note that the water depth of the caisson 10 is greater than the water depth of the mound. Then, two buoyant bodies 12 are placed on both sides of the caisson 10 with a slight distance between them, seawater ballast is poured into these buoyant bodies 12, and they are submerged so that the rod 13 is slightly below the hook 11. (See Figure 1).

Next, the two buoyant bodies 12 are placed alongside the caisson 10 on both sides, the seawater ballast is drained, and the buoyant bodies 12 are gradually brought to the surface. As a result, first, the rod 13 of each buoyant body 12 engages with the hook 11 of the caisson 10 from below, so that the upper part of each buoyant body 12 and the upper part of the caisson 10 are connected to prevent them from coming off due to shaking. to pull each buoyant body 12 upward (see Fig. 2). Then, by draining the seawater ballast from the two buoyant bodies 12 and floating them, the caisson 10 is supported from both sides and gradually lifted.

When all or most of the seawater ballast of the buoyant body 12 is drained, the caisson 10's stagnant water flows into the mound 17.
Since the water depth is smaller than that of mound 17, the drainage is stopped and caisson 10 is positioned directly above mound 17.
Move the caisson 10 and the buoyant body 12 (third
(see figure).

Next, seawater ballast is poured into the two buoyant bodies 12 to gradually sink them, thereby allowing the caisson 10 to land on the mound 17. Caisson 10
When the buoyant bodies 12 have landed on the bottom, the upper part of each buoyant body 12 is separated from the caisson 10, and then only the buoyant body 12 is allowed to sink a little, the rod 13 is removed from the hook 11, and the buoyant body 12 is separated from the caisson 10 on both sides. .
This completes the installation of one caisson 10, and the next caisson is installed in the same manner.

Effects of the Invention In the method according to the present invention, ballast-adjustable buoyant bodies are arranged on both sides of a caisson, and engaging members on both sides of the caisson are engaged with engaging members on the sides of the buoyant body to transform the caisson into a buoyant body. lifting the caisson with a buoyant body so that the caisson's water depth is less than the water depth of the mound; moving the caisson and the buoyant body so that the caisson is located directly above the mound; In addition, since it involves sinking the buoyant body and bringing the caisson to the bottom on the mound, it is possible to safely and easily move the caisson floating on the water surface to the bottom mound, which is shallower than the stagnant water, without using a crane ship. Can be installed. Therefore, according to the present invention, it becomes possible to install a large caisson that exceeds the capacity of a crane on a shallow underwater mound. Then, the buoyancy bodies with adjustable ballast are arranged on both sides of the caisson, and the engagement members on both sides of the caisson are engaged with the engagement members on the sides of the buoyancy body, so that the caisson is supported from both sides by the buoyancy bodies.
The caisson can be easily installed by simply engaging the engaging members and adjusting the ballast of the buoyant body by pouring seawater ballast, etc., without using a winch or the like, and the equipment used for this is also easy to install. All you need is something cheap.

[Brief explanation of drawings]

1 to 3 are partially cutaway front views showing an example of the caisson installation method according to the present invention in the order of steps;
4 is a plan view of FIG. 2, FIG. 5 is an enlarged plan view of a part of FIG. 4, and FIG. 6 is a sectional view taken along the line XX in FIG. 10... Caisson, 11... Hook (engaging member), 12... Buoyant body, 13... Rod (engaging member),
17...Mound.

Claims (1)

[Claims] 1. A method for installing a caisson floating on the water surface on an underwater mound shallower than its stuttering water, in which floating bodies with adjustable ballast are placed on both sides of the caisson, The caisson is supported from both sides by the buoyant body by engaging the engaging member with the engaging member on the side of the buoyant body, and the caisson is lifted up by the buoyant body so that the water depth of the caisson is smaller than the water depth of the mound. , so that the caisson is located directly above the mound,
A method for installing a caisson comprising: moving the caisson and the buoyant body; and sinking the buoyant body to bring the caisson to the bottom of the mound.