JP2513304B2 - How to install a tubular structure in water - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an existing water storage dam, which is carried out when a tubular structure for taking in surface water is installed underwater. Is related to the installation method.

[Prior art and its problems]

If the intake of the existing dam is near the bottom of the dam, water will be taken from the low temperature part near the bottom of the stored water. Warm water flow is desirable when planning recreation and leisure facilities using waterfronts in the rivers downstream of Tam, and it is necessary to take water from the dam from the surface layer.

When replacing the existing intake near the bottom of the dam with surface intake, a new intake with a cylindrical structure will be installed.
Alternatively, it may be possible to modify the existing water intake facility, but construction work underwater, drilling tunnels on the dam side and bottom, and complicated construction at a water depth of several tens of meters are required. However, the construction is large-scale and the construction cost is considerable.

The present invention has been made to solve the above problems, and an object thereof is to provide a method for installing a tubular structure in water, which allows easy and inexpensive installation of the tubular structure in water. And

[Means for solving the problem]

The method for installing a tubular structure according to the present invention uses a divided ready-made tubular structure and installs it in water by utilizing buoyancy.

The tubular structure is configured by a plurality of previously divided tubular bodies, and the tubular bodies are assembled one by one by immersing the tubular bodies in water. This divided body is formed of precast concrete, steel plate or the like into a cylindrical or square tube shape.

Both ends of the divided body are sealed with a temporary lid to seal the internal space. The divided body is towed to the installation position while floating on the water. Here, water is supplied to the sealed space of the divided body by a pump to reduce the buoyancy of the divided body.

The rope is passed through a hook fixed to the bottom of the water, and the end of the rope is connected to the lower end of the split body. A floating body for giving buoyancy is attached to the upper end of the divided body. Various types of floating bodies are conceivable, and a floating bag may be used, or a lightweight material such as foamed resin may be used. Pull the rope to immerse the split body in the state where it stands upright correctly.

Then, the divided body to be connected on the submerged divided body is towed and sunk in the same manner as described above, and connected by bolts, nuts or the like. In this way, the tubular structure is constructed in water by connecting the plurality of divided bodies. If necessary, fix the tubular structure with permanent anchors.

[Action]

The use of off-the-shelf tubular divisions significantly reduces the work in water. No formwork or concrete pouring in water, no water pollution.

Use buoyancy to carry and sunk. Therefore, the temporary material is almost unnecessary.

〔Example〕

Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

In the figure, reference numeral 1 is a dam body of an existing water storage dam, and an intake port 2 is opened at a lower part of this dam body 1, that is, at a position slightly apart from the water storage surface. Reference numeral 3 is an existing valve provided in the water passage 4.

The example is a work of mounting a cylindrical structure which is a surface water intake facility along the bank of the existing water storage dam. The tubular structure 5 has a rectangular tubular shape, and in the embodiment, it is composed of tubular divided bodies 6, 6.

The ends of the tubular divided bodies 6, which are installed below the tubular divided bodies 6, 6, are sealed with temporary lids 7, 7. A partition 8 is provided in the middle part. Temporary water supply / drainage pipes 9, 9 are provided in the two spaces partitioned by the middle partition 8 so that each can independently supply and drain water into the space.

The tubular divided body 6 floats on the water and tows. Water is supplied to the lower side of the tubular divided body 6 at a predetermined position through the temporary water supply / drainage pipe 9, and is vertically erected on the water.

The ropes 11, 11 are passed through the hooks 10, 10 anchored to the bottom of the water, and the ends of the ropes 11 are connected to the lower ends of the tubular split bodies 6. A floating bag-shaped floating body 12, 12 is provided on the upper end of the tubular divided body 6.
To connect.

Pull the ropes 11 and 11 to submerge the tubular divided body 6 in water.
The tubular structure 6 is sunk while being vertically erected in water by the floating bodies 12, 12. Temporary water supply / drainage pipes 9, 9, upper temporary lid 7, and partition 8 are removed.

Next, the upper tubular divided body 6 is towed by the same operation as described above and submerged in water. The upper tubular segment 6 is placed on the lower tubular segment 6 and connected by bolts and nuts. The lower temporary lid 7 and the partition 8 of the upper tubular divided body 6 are removed, and the floating bodies 12, 12 are replaced with the upper tubular divided body 6. In some cases, the floating body 12 is added.

After the above work, the main anchor 13,13
The cylindrical structure 5 is fixed by. Water intake 2 is a water stop wall 13
The slit-shaped water intake formed in the water blocking wall 13 and the lower end of the tubular structure 5 are continuous with each other. An upper water intake lid 14 is attached above the cylindrical structure 5, and the upper water intake lid 14 is opened and closed by a motor 15 installed thereon.

〔The invention's effect〕

The present invention has the configuration as described above, and can obtain the following effects.

(B) Towing a ready-made tubular segment and pulling the rope to sunk it makes it easier to work underwater.

(2) There is no formwork in the water, no concrete is placed, and there is no water pollution.

(C) It uses less temporary material and can be constructed inexpensively in a short period of time.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a bank with a tubular structure installed, and FIGS.
FIG. 8 is an explanatory view of a construction order of installation work of the tubular structure in water. 1 ... Levee body, 2 ... Intake port, 5 ... Cylindrical structure, 6 ...
Cylindrical division, 7 ... Temporary lid, 8 ... Interior partition, 9 ... Temporary water supply / drainage pipe, 10 ... Hooking device, 11 ... Rope, 12 ... Floating body,
13 …… Water stop wall.

Claims (1)

(57) [Claims] 1. A tubular structure is constituted by a plurality of tubular divided bodies, and both ends of the tubular divided body are sealed by temporary lids, towed on the water to feed water into the divided bodies at predetermined positions, and to the bottom of the water. Connect the end of the rope hooked to the fixed hook to the both ends of the split body, attach the floating body to the upper end of the split body, pull the rope to immerse the split body in water, and also immerse it in water A method for installing a tubular structure in water, characterized in that the other divided body is connected to the divided body to form a tubular structure.