JPS63163083A - Method of submarine piping construction - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 water intake pipes, is usually carried out by connecting ready-made steel pipes or resin pipes on land or with rings on a ship, and then sinking them into the seabed using floating towing methods, submarine towing methods, etc. In general, the length of piping is often several thousand meters, and conventional pipes made of materials that do not easily deform are difficult to adapt to the unevenness of the seabed, and there are cases where it is difficult to adapt 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.
Laying of piping formwork from this grout hole.

After the connection, the double sheet is filled with filler material and the piping formwork is laid out according to the undulations of the seabed.

〔Example〕

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

This invention consists of laying a pipe form A consisting of visible double sheets 1.1 on the seabed and connecting them to each other, after which the double sheets 1.
In this method, a filler material 4 is filled in the pipe 1 and the piping follows the undulations of the seabed.

As shown in FIG. 1, the piping form A includes flanges 2.2 for interconnection at both ends, and a double sheet 1.1 of synthetic fiber cloth or the like stretched in a cylindrical shape between the flanges 2.2. It is composed of a hoop-shaped shape retaining member 3 attached to the inside of double sheets 1 and 1 at a required interval in the length direction, and a grout hole 1a is provided on the outer circumferential 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 piping formwork A contracts, grout hole 1a
will also serve as an air vent.

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, the double sheet 1.1 is filled with a filler 4 through the grout holes 1a, thereby providing piping in a shape that corresponds to the undulations of the seabed.

The filling material 4 is mainly concrete, mortar, hardening resin, etc., and is injected into the double sheet 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, a grout pipe is connected to the grout hole 1a, and the double sheet 1.
1 is filled with a filler material 4.

FIG. 2 shows the piping state of the piping form A.

After the strength of the filler 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 piping is carried out by filling a filler after laying a piping form made of a flexible double sheet, the piping can be carried out along the undulations of the seabed regardless of its shape. Is possible.

In addition, the piping formwork is made of lightweight sheets that are retractable, making transportation efficient, and construction on site can be carried out easily and neatly.

[Brief explanation of the drawing]

FIGS. 1-r and 1-n are a vertical sectional view and a horizontal 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-m--Piping formwork, 1---------Sheet, 1a----1--Gout hole, 2--Flange, 3--------1 Shape retaining material, 4. Filling material, 5. Reinforcing material.

Claims (1)

[Claims] (1) A double flexible sheet is stretched in a cylindrical shape between flanges for interconnection arranged at both ends, and hoops are placed inside this double sheet at required intervals in the length direction. After laying the piping formwork, in which the shape-retaining material is attached and grout holes are provided on the outer periphery of the outer sheet, at the predetermined piping position on the seabed, the piping formworks are interconnected,
A submarine piping method in which filling material is filled into a double sheet through grout holes and piping is connected to the seabed.