JPH048985A - Connecting method of concrete-covered steel pipe - Google Patents

Abstract

PURPOSE:To make the connection work easier by connecting the connecting ends of concrete-covered steel pipes by welding, and after that, installing a concrete pattern divided into two parts along the both sides of the connecting ends, and filling a concrete from a concrete pouring hole on the concrete pattern. CONSTITUTION:The connecting ends of both concrete-covered steel pipes 1 to be connected are not covered partially with the cover concrete, but the steel pipes 1 are exposed at the parts. The both pipe ends of the steel pipes 1 to be connected are connected by using a welding joint W in the construction site. After that, a concrete pattern 4 divided into two parts is contacted along the peripheries of both ends of the cover concretes 2 at both sides of the connecting ends from the upper and the lower sides, a flange is fastened with bolts and nuts 7, and a concrete 6 is filled from a hole 9 for screw lid to be a concrete pouring hole. As a result, concrete-covered steel pipes can be connected easily at the construction site.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a method for connecting concrete-coated steel pipes, which enables easy connection on-site of a vibrating line for pneumatic conveyance in which the outer periphery of the steel pipe is coated with concrete. It is related to.

[Conventional technology]

In recent years, by utilizing surplus electricity at night, compressed air from a land-based compressor 2 as shown in FIG. It is being considered that compressed air stored during daytime peak power demand times can be used to generate electricity using a turbine 21 on land to supply electricity.

At this time, a vibe line 3 is required to send compressed air between the compressed air storage device 1 on the seabed B and the power plant side such as the compressor 2 and turbine 21 on land. Since compressed air is sent, buoyancy works in the water, so in order to lay the Vibrine 3 on the bottom of the water instead of burying it underground, it is necessary to cover the Vibrine 3 with concrete to prevent it from floating up. It is being considered.

To achieve this, it is essential to connect concrete-coated steel pipes of unit length at the construction site to form Vibrine 3, which is made up of steel pipes whose outer peripheries are covered with concrete. The method has not yet been specified, and the development of such a method is desired.

[Problem to be solved by the invention]

The present invention was made in response to the above-mentioned needs, and an object of the present invention is to provide a method for connecting concrete-coated steel pipes that can be easily connected on-site.

[Means to solve the problem]

As a means for solving the above-mentioned problems, the connection method of the present invention is to connect the ends of the concrete-coated steel pipes to be connected by welding, which are not covered with concrete, and then connect the concrete-coated steel pipes to each other by welding. Attach a two-part concrete formwork using bolts, nuts, etc. to span the outer periphery of each covered concrete on both sides of the end, and fill the concrete formwork with concrete through the concrete injection hole made at the top of the concrete formwork. It is characterized by this.

In this case, it is preferable to provide a notch corresponding to the thickness of the concrete formwork on the outer periphery of each covering concrete that spans the two-part concrete formwork, and to make a cut in the concrete injection hole provided at the top of the concrete formwork. It is also preferable to provide a screw cap that is easy to attach and remove, and to close the injection hole with a screw cap after pouring concrete.

〔Example〕

An embodiment of the concrete-coated steel pipe connection work by the method of the present invention will be described below with reference to the drawings.
The figure is a sectional side view of the main part of the concrete-coated steel pipe when it is connected, and FIG. 2 is a front sectional view taken along the line A--A in FIG. 1.

First, the connecting ends of each of the concrete-coated steel pipes to be connected are not partially covered with the covering concrete 2 and the steel pipes 1 are exposed. It is desirable to have it constructed.

Next, the pipe ends of the steel pipes 1 at the connection ends are welded together at the site using a weld joint W, but a reinforcing plate may be used in that part if necessary.

After that, apply two halves of concrete formwork 4 from above and below, as shown in Fig. 2, over the outer periphery of each end of the covering concrete 2 on both sides of the connection end, and tighten each flange with bolts and nuts 7. Attach by.

In addition, in this embodiment, cuts 6 corresponding to the thickness of the frame plate of the concrete formwork 4 are formed on the outer periphery of each end of the covered concrete 2.
is provided so that the outer diameter of the connecting part is the same as that of the main body. Further, although the concrete formwork 4 is made of steel plate, it may be made of corrosion-resistant material such as plastic.

Next, open the screw cap 10 of the screw cap hole 9, which is the concrete pouring hole provided at the top of the concrete form 4, and fill the space inside the concrete form 4 with concrete 8 through the opening. Tighten the lid 10.

In this embodiment, the concrete injection hole for filling the concrete 8 can be opened and closed using the screw cap 10, but any means may be used for opening and closing the hole. Sometimes, even if it is not sealed, it may be sealed with the concrete 8 itself.

〔Effect of the invention〕

According to the method for connecting concrete-coated steel pipes of the present invention described above, there is an effect that concrete-coated steel pipes can be easily connected at a site near where a vibrate line is installed.

Note that the method of the present invention can be particularly effectively applied when a pipeline for pumping compressed air is laid on the seabed.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of the main part of the connection end in an example of the connection work of concrete-coated steel pipes by the method of the present invention, Fig. 2 is a front sectional view taken in the direction A-A of Fig. 1, and Fig. 3 1 is a layout diagram showing an installation example of a compressed air storage device for underwater installation. 1... Steel pipe, 2... Covered concrete, 4... Concrete formwork, 8... Concrete, 9... Hole for screw cap, W... Welded joint. Agent Patent Attorney Nobuo Ogawa −

Claims (1)

[Claims] After welding the connecting ends of the concrete-coated steel pipes that are not covered with concrete to be connected, install two-part concrete formwork across the outer periphery of each concrete-coated steel pipe on both sides of the connection ends. , A method for connecting concrete-covered steel pipes that fills concrete into the concrete formwork through a concrete injection hole provided at the top of the formwork.