JPH0469313B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a submarine piping method for piping a pipe such as a deep water intake pipe for ocean thermal power generation to the seabed.

[Problem that the invention seeks to solve]

Piping work for pipes laid on the seabed, such as deep-sea water intake pipes, is usually carried out by connecting ready-made steel pipes or resin pipes on land or on a ship, and then sinking them into the seabed using floating towing methods, submarine towing methods, etc. , generally the piping length is several thousand
In many cases, pipes made of conventional materials that do not easily deform are difficult to adapt to the unevenness of the seabed, and it is sometimes difficult to adjust to the undulations of the seabed.

This invention was made based on the circumstances of submarine piping, and attempts to eliminate the above-mentioned disadvantages by constructing the pipe body from a flexible material.

[Means for solving problems]

In the present invention, by constructing the piping formwork, that is, a single pipe body laid on the seabed, with a flexible double sheet, it is possible to adapt the formwork to the unevenness of the seabed and to install continuous piping. do.

The double sheet is stretched in a cylindrical shape between flanges for interconnection placed at both ends of the piping form, and inside it there are hoop-shaped shape-retaining materials spaced at intervals along the length. It is attached.

In addition, grout holes are provided on the outer periphery of the outer sheet, and after the piping form is laid and connected through the grout hole, filler is filled into the double sheet, and the piping form is arranged according to the undulations of the seabed. That will happen.

〔Example〕

The present invention will be explained below based on the drawings showing one embodiment.

In this invention, after laying a piping form A consisting of flexible double sheets 1, 1 on the seabed and connecting them to each other,
This is a method in which the double sheets 1, 1 are filled with a filler material 4 and the piping follows the undulations of the seabed.

As shown in Fig. 1, the piping form A has flanges 2, 2 for mutual connection at both ends,
It consists of double sheets 1, 1 of synthetic fiber cloth etc. stretched in a cylindrical shape between the sheets 1, 1, and hoop-shaped shape retaining materials 3 attached at required intervals in the length direction inside the double sheets 1, 1. Grout holes 1a are provided on the outer peripheral side of the outer sheet 1.

In consideration of the convenience of transporting the piping form A, it is preferable that the shape-retaining members 3 have different diameters placed alternately as shown in the figure so that the pipe form A can be contracted. When the piping form A contracts, the grout hole 1a also serves as an air vent hole.

Further, a reinforcing material 5 such as a wire is inserted into the double sheets 1, 1 in the length direction as necessary.

After the piping form A is laid and interconnected, a filling material 4 is filled into the double sheets 1 through the grout holes 1a, so that the piping is shaped in accordance with the undulations of the seabed.

The filler 4 is mainly concrete, mortar, hardening resin, etc., and is injected into the double sheets 1, 1 under water. In the former case, the piping form A is a concrete pipe, and in the latter case, the piping form A is a resin pipe.

Next, the construction procedure will be briefly explained.

First, a stretched piping form A is laid at a predetermined piping position on the seabed.

Next, the piping forms A and A are connected to each other, and a grout pipe is connected to the grout hole 1a.
A filling material 4 is filled into the double sheets 1, 1. Second
The figure shows the piping state of piping form A.

After the strength of the filling material 4 has been developed, the piping form A is buried in the seabed by backfilling with soil to protect it as necessary.

〔Effect of the invention〕

This invention is as described above, and since the piping form is constructed by laying a piping form made of a flexible double sheet and then filling it with filler, it can be installed along the undulations of the seabed regardless of its shape. It is possible to pipe.

In addition, since the piping form is made of lightweight sheets and is retractable, transportation is efficient and construction on site can be carried out easily and simply.

[Brief explanation of the drawing]

1-, are a longitudinal sectional view and a transverse sectional view, respectively, showing an example of the structure of a piping form, and FIG. 2 is a schematic diagram showing the state of the piping. A... Piping formwork, 1... Sheet, 1a... Grout hole, 2... Flange, 3... Shape retaining material, 4
...Filling material, 5...Reinforcing material.

Claims (1)

[Claims] 1. A double flexible sheet is stretched in a cylindrical shape between interconnecting flanges located at both ends,
Hoop-shaped shape-retaining materials are attached to the inside of this double sheet at required intervals in the length direction, and a piping formwork with grout holes provided on the outer periphery of the outer sheet is used to connect specified piping on the seabed. A submarine piping method in which the piping forms are connected to each other after the piping is laid in place, and filler is filled through the grout holes in the double sheet to connect the piping to the seabed.