KR200209185Y1 - Spheroidal graphite cast iron pipe having a coupling device - Google Patents

Abstract

The present invention relates to a spherical graphite cast iron pipe having a connection structure, by forcibly inserting the connection structure into a long cast iron pipe so that there are no flow gaps in the binding portion, and applying a screwing means and a welding means to fix the state. (Flange or socket) is a cast iron pipe that is firmly fixed.

Description

Spheroidal graphite cast iron pipe having a coupling device

The present invention relates to a spherical graphite cast iron pipe having a connection structure, and in particular, a connection structure such as a flange type or a socket type is separately bonded to a long length cast iron pipe, and the binding state thereof is firm, and its purpose is to improve yield and productivity. have.

According to the conventional manufacturing method of spherical graphite cast iron pipe (hereinafter, referred to as cast iron pipe), when the cast iron pipe is short (about 1.2 m or less), the pipe body and the connecting structure (flange or socket part) are cast together using a sand mold. The long cast iron pipe body, which is difficult to manufacture, was manufactured by centrifugal casting and bound to a separately manufactured connecting structure at one end thereof.

The binding structure of the conventional cast iron pipe and the connection structure as described above is inserted through the O-ring 30 through the insertion hole 21 of the connection structure 20 slightly larger than the outer diameter of the cast iron pipe body 10 as shown in FIG. Then, there was one constructed by welding the outer end 40 (Registration Utility Model No. 170256).

This conventional binding structure has the following problems.

That is, the welded part is welded with spherical graphite cast iron, and the welding state thereof is very unstable due to the characteristics of the material, and there is a gap between the surface of the cast iron pipe 10 and the inner surface of the insertion hole 21 of the connecting structure 20. When there is an external impact during distribution or installation, the cast iron pipe and the connecting structure flow when it is buried underground and subjected to impact or earth pressure, and at this time, the weld part cracks and eventually breaks and leaks. There was this.

In the present invention, in order to solve the conventional problems as described above, by inserting the connection structure to the long cast iron pipe so that there is no flow gap in the binding portion, by applying the screwing means and welding means to fix the connection structure (flange or It is a cast iron pipe with a solid socket).

1 is an exploded perspective view illustrating the present invention

2 is a cross-sectional view illustrating the configuration of the present invention

3 is a cross-sectional view illustrating another embodiment of the present invention

4 is an exemplary cross-sectional view of a conventional cast iron pipe.

※ Explanation of main parts of drawing

100: cast iron pipe

200: connection structure 201: short pipe

300: binding screw 301: screwing

400: weld

This configuration will be described in detail with reference to the accompanying drawings.

In the present invention, when the socket-type or flange-type connection structure 200 is bound to the cast iron pipe body 100, the outer diameter of the cast iron pipe body 100 is slightly larger than the inner diameter of the short pipe part 201 of the connecting structure 200. Forcibly inserted into each other, punctures the screw holes 301 that are recessed from the outer surface of the single pipe portion 201 of the overlapping connection structure 200 to the land portion of the cast iron pipe 100 at equal intervals, and binds the binding screw 300 thereto. It is a configuration configured by welding 400 around the outer end of the binding part after wearing.

In the implementation of the present invention, three or more binding screws 300 are fixed at equal intervals, and during welding, the connection structure 200 is formed to have a normal welding groove to perform a good welding condition. At the time of binding 200, one or both ends of the connection structure 200 may be welded as shown in FIG. 2, and at the time of binding of the socket-type connection structure 200, the connection structure exposed to the surface as shown in FIG. 3. Weld the ends of 200.

The configuration of the present invention as described above is forcibly inserting a cast iron pipe body 100 having an outer diameter slightly larger than the inner diameter of the short pipe part 201 of the connection structure 200, so that the inner surface of the short pipe part 201 and the outer surface of the cast iron pipe 100 are different. There is no flow space between the binding state has a very strong effect, the overlapping portion is thus effected to reinforce the binding state by screwing a plurality of binding screws 300 at equal intervals, one end or both ends of the welding (400 Due to the good sealing condition, there is an effect of preventing leakage, and there is no flow space in the welded portion, so that the welded state is maintained for a long time and the binding structure is firm.

Claims (1)

In binding the connection structure 200 such as the socket type or flange type to the cast iron pipe body 100, the cast iron pipe body 100 having an outer diameter slightly larger than the inner diameter of the short pipe portion 201 of the connection structure 200 to the short pipe portion Inserted into the 201, the plurality of fastening screw 300 is attached to the overlapping circumference at equal intervals, the connection characterized in that the binding by welding 400 the end circumference of the connected connection structure 200 Spherical graphite cast iron pipe with structure.