JPH0448128B2 - - Google Patents

Description

[Detailed description of the invention] ≪Industrial application fields≫ The present invention relates to a method for installing a box.

<<Prior Art>> As is well known, a floating caisson installed on the water bottom is installed by towing it to a place where it will be sunk and then suspending it from a large crane ship or the like.

In addition, when installing using a crane ship, etc., if the water is near the coast or in a river where the water depth is shallow, the swamp of the crane ship may exceed the water depth and the crane ship may not be able to operate. Other methods have been adopted, such as creating a rocky island, sinking a caisson, and then dismantling the island, or dredging the bottom of the water to deepen the water depth.

However, in the above method of installing a floating caisson, the caisson is generally assembled completely on land or at a dock, and then towed to the sinking site, but this method requires a long construction period. It had the disadvantage of becoming

Therefore, a method has recently been proposed in which only the lower end of the caisson is made of steel, the caisson is fabricated on land, the caisson is towed to the location, and then concrete is poured inside the caisson for installation.

This method has the advantage of requiring only a small vessel to tow the caisson and shortening the construction period; however, if the concrete reaches the water bottom before it hardens, it may become deformed due to unevenness of the water bottom, etc. There was a problem that the material would harden even if it was left upright.

Furthermore, when it is submerged, the installation position is likely to shift due to waves or water currents, and if it does shift, it is difficult to reinstall it in a predetermined position, making it difficult to install with high precision.

This invention has been made in view of the above-mentioned conventional problems, and its purpose is to:
To provide a method for installing a box that does not cause harmful deformation during installation and can be installed with high precision.

≪Means for Solving the Problems≫ In order to achieve the above object, the present invention provides a method for installing a box installed on the bottom surface of water, in which a cutting shell having an airtight bag disposed on the bottom surface is installed. The box is towed to the site, and while injecting gas into the airtight bag, concrete is poured into the cutter shell to form the lower part of the box in a floating state, and after the concrete hardens, it is placed on the bottom of the water. It is characterized by

<<Operation>> According to the installation method with the above configuration, the process of pouring concrete into the cutting edge shell of the box is carried out in a floating state by injecting gas into the airtight bag and adjusting its buoyancy. Moreover, since the poured concrete is installed on the water bottom after it has hardened, no deformation occurs when it lands on the water bottom.

Furthermore, by adjusting the amount of gas injected into the airtight bag, it is possible to control the state of submersion and reinstallation, so installation can be performed with high precision.

<<Example>> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the method for installing a box according to the present invention in the order of steps.

In the method shown in the figure, first, a cutter shell 12 in the shape of a hollow steel body whose lower end is closed, which is the lower side of a box with a plurality of airtight bags 10 arranged on the lower surface, is manufactured on land. Each airtight bag body 10, 10 has a pipe 14, 1 extending to the upper surface of the cutting edge shell 12.
4 is connected.

When the cutting edge shell 12 is completed, it is transported in a floating state to a burial site by a small towing vessel 11, as shown in FIG. 1a.

When the blade shell 12 arrives at the burial site, the first
As shown in Figure b, concrete is placed inside.

When pouring concrete, air is injected from the pipe 14 to inflate the airtight bags 10, 10 to adjust the buoyancy and perform this in a floating state.

After pouring enough concrete to form the bottom plate 16 of the box, the floating state is maintained until the concrete hardens.

When the bottom plate 16 is completed, the air in the airtight bags 10, 10 is removed through the pipe 14, and the blade mouth shell 12 is gradually lowered, and the blade mouth 18 is placed on the water bottom surface 2.
0 (see Figure 1c).

Note that it is sufficient to cast the concrete in an amount sufficient to allow the cutting edge shell 12 to stably land on the bottom surface of the water, so it is not necessarily necessary to cast the amount of concrete to form the bottom slab 16.

In this case, the posture control during submersion is performed by controlling the airtight bag 1
This is done by increasing or decreasing the amount of air in the airtight bag 10, and if the landing position shifts, air is again injected into the airtight bag 10 and the airtight bag 10 is reinstalled.

When the cutting edge shell 12 forming the bottom plate 16 is accurately positioned and installed as described above,
As shown in FIG. 1d, the wall portion 22 of the box is formed on the bottom plate 16, the water bottom surface 20 below the cutting edge 18 is excavated, the box is lowered to a predetermined depth, and the bottom wall 22 of the box is formed on the bottom plate 16. Concrete is poured into the created space to complete the installation.

<<Effects of the Invention>> As explained above, according to the method for installing a box according to the present invention, concrete is poured in a floating state at a place where concrete is deposited in a cutting shell having an airtight bag provided on the lower surface. to form the lower side of the box, and after the concrete has hardened, this will be deposited.
While eliminating harmful deformation of the box, it is also possible to control the posture by injecting and discharging gas into the airtight bag when it is submerged, so even if the installation position is shifted due to waves or water currents, it can be easily reinstalled. It becomes possible.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram sequentially showing the construction order of the method of the present invention. 10...Airtight bag body, 12...Blade mouth shell, 1
4...Pipe, 16...Bottom plate, 18...Blade mouth, 2
0... Water bottom surface, 22... Wall part.

Claims (1)

[Claims] 1. In the method of installing a box installed on the bottom surface of water, a cutting shell with an airtight bag arranged on the bottom surface is towed to the installation site, and while gas is injected into the airtight bag, the inside of the cutting shell is Concrete is poured into the box to form the lower part of the box in a floating state.
A method for installing a box, characterized in that the box is installed on the bottom surface of a water body after the concrete has hardened.