KR200331310Y1 - Flange connection structure of large size pipe - Google Patents

Abstract

The present invention is to provide a hermetic structure to be applied to transport conduits such as water and sewage and oil, and more particularly to the flange joint structure of a large tube improved the structure of the flange inserted when connecting between large cast iron pipes.

The present invention provides a large conduit (1) having a flange (2) comprising an insertion portion (21) having an inner circumference into which the outer circumference of the conduit (1) is closely attached, and a mounting portion (22) protruding upright from the insertion portion (21). Inserted at one end of; A packing (3) attached simultaneously to the ends of the large conduit (1) and the flange (2); A plurality of pins 4 inserted into the plurality of pinholes 211 formed by drilling through the insertion portion 21 to a part of the large conduit 1; It consists of a welded portion (5) is carried out on the stepped portion formed between the end of the insertion portion 21 of the flange (2) and the outer circumference of the conduit (1).

Therefore, the present invention provides a structure that can greatly improve the resistance to the inside while utilizing the conventional flange type connection method as it is, and also achieves economy by providing such a structure easily and inexpensively, especially in the field installation It is designed to be easy to achieve the installation economy and is an effective and useful design.

Description

Flange connection structure of large size pipe}

The present invention is to provide a hermetic structure to be applied to transport conduits such as water and sewage and oil, and more particularly to the flange joint structure of a large tube improved the structure of the flange inserted when connecting between large cast iron pipes.

Large conduits for water and sewage are usually made of cast iron, which is a large pipe (6 m in total length), which is cast by a hollow rotary mold, and is produced by pouring a casting in a large casting pipe and rotating it, forming a flange. Since it is difficult to make a straight pipe, it is common to install a flange to connect the conduit and the conduit during construction.

Various forms are used for such a connection method, and the design of Utility Model Registration No. 20-0211171 (registered on November 10, 2000), 'the coupling structure of the flange or the socket of the cast iron pipe' is shown as a sectional view of the configuration in FIG. As described above, "in the coupling structure of a cast iron pipe which couples a flange or a socket to the end of a cast iron pipe, at least one end 7 is fitted to the outer circumferential surface of the end 7 of the tube body 1 extending in a straight pipe shape. A short pipe portion (12) and a flange portion (14) extending radially from one end of the short pipe portion (12) or a gradually extending socket portion (15), wherein the short pipe portion (12) has a screw fastening hole; The small top bolt 17 is fastened to the tube main body 1 through 16, and an o-ring groove 23 into which the water-expandable O-ring 24 is inserted is formed on the inner circumferential surface of the short pipe portion 12. In the rear end of the part 12 and the gap of the tube body 1, a sealing material 25 such as silicon or cement is provided. It consists of a sheath. "

However, the conventional design of such a structure has the advantage of preventing heat deformation cracks or leaks due to welding by providing a structure that does not weld a flange or a socket, but has a problem in that it is vulnerable to leakage at the joint portion of the short pipe. .

The present invention is a result of the careful attention to the above problems over a long period of time, and efforts to improve it, the invention was completed, while almost using the conventional flange-type connection method, while providing a structure that can significantly improve the resistance to leaks The cast iron pipe, which is a problem caused by rusting, is deteriorated in durability and protection of surrounding facilities, and in addition, it is economical by providing such a structure easily and inexpensively. It is designed to be built.

1 is a configuration state of the present invention,

2 is an exploded state of the present invention,

3 is an enlarged cross-sectional view taken along the line A-A of FIG.

Figure 4 is a cross-sectional view of another configuration state of the present invention,

5 is a cross-sectional view of the installation state of the present invention,

Figure 6 is a cross-sectional view of the configuration of another conventional design.

* Explanation of code of the main parts in the drawing

1. Conduit (pipe body)

12. Single Pipe 14.Flange 16. Screw Fastening

17. Stopbolt

2. Flange

21.Inserted part 211.Pinhole 22. Mounting part

221.Bolt hole 23.O-ring groove 24.O-ring

25. Sealing material

3. Packing

31.Bolt Hole

4. Pin

5. Weldment

51. Spot welding

6. Fixing bolt

The present invention provided to solve the above problems is made of the following structure.

Figure 1 is a configuration diagram of the subject innovation, Figure 2 is an exploded view of the subject innovation, Figure 3 is an enlarged cross-sectional view shown in the line A-A of FIG.

The present invention, as shown in the drawings, the outer periphery of the large conduit 1 is inserted into the insertion portion 21 having an inner periphery, and the mounting portion 22 protrudes upright to the insertion portion 21 A flange 2 is inserted at one end of the large conduit 1; A packing (3) attached simultaneously to the ends of the large conduit (1) and the flange (2); A plurality of pins 4 inserted into the plurality of pinholes 211 formed by drilling through the insertion portion 21 to a part of the large conduit 1; It consists of a welded portion (5) is carried out on the stepped portion formed between the end of the insertion portion 21 of the flange (2) and the outer circumference of the conduit (1).

4 is a cross-sectional view of another configuration state of the present invention.

In the above configuration, the spot welding portion 51 is formed on the plurality of pinholes 211 into which the plurality of pins 4 are inserted, and the packing 3 extends integrally at the upper and lower ends so that the bolt holes 31 are formed. It is preferable to characterize the structure to be perforated.

The installation of the flange joint structure of the large pipe of the present invention and the connection between the conduits 1 and 1 according to the present invention will be described with reference to the installation state diagram of FIG. 5 as follows.

When the conduit 1 to which the present invention is applied is a straight pipe having both ends in a straight line, the flanges 2 should be installed at each of both ends, and the flanges 2 should also be installed at the side conduits 1 facing each other. This is possible, but if one flange (2) is formed at the time of casting, it is possible to fasten by installing only the end that is not installed, which is the flange (2) installed in the conduit (1) integrated into the casting (鑄造) This is because the same shape as the flange (2) is installed as (for the sake of understanding, only a pair of straight pipe and a portion of the connection is shown in the figure).

First, insert the insertion part 21 so that the mounting part 22 of the flange 2 faces outward at the end of the conduit 1 formed by the straight pipe (taper the inner diameter a little and indent it to make a stronger structure. Perforation to the conduit 1 side at a predetermined position of the insertion section 21, and drills the pinhole 211 by about half the thickness of the conduit 1, and inserts the pin 4 into the pinhole 211. (In some cases, spot welding is performed.) The welding step 5 is made by welding the stepped portion formed between the end of the insertion part 21 of the flange 2 and the outer circumference of the conduit 1 to attach the flange 2. The conduit 1 is completed (up to this fixing, which is usually a manufacturing process), and the packing 3 is attached to the end face of the mounting portion 22 of the conduit 1 and the flange 2 (without packing). It is also possible to place it in place at the time of installation in the field, in which case the structure of the additional configuration of the present invention is preferred).

The fixed bolt (6) is transferred to the site with the completed flange (2) attached to the site and bolted through a bolt hole (221) formed in the mounting portion (22) against the flange of the conduit (1) installed next to it at the required location. ), Installation is simply completed.

Looking at the operation of the present invention described above are as follows.

According to one configuration of the present invention, a flange (2) comprising an insertion portion (21) having an inner circumference into which the outer circumference of the large conduit (1) is closely attached, and a mounting portion (22) protruding upright from the insertion portion (21). ) Is inserted into one end of the large conduit 1, so that the flange 2 is inserted into one end of the straight conduit 1 to be joined to the flange 2 of the other conduit 1.

Then, the packing 3 is brought into close contact between the conduits 1 and 1 by the connection between the flanges 2 and 2 by the packing 3 attached to the end of the large conduit 1 and the flange 2 at the same time. Interposed simultaneously between (1, 1) and between the ends of the flanges (2, 2) to ensure perfect watertightness. At this time, the packing (3) can be easily installed without a separate position work in the field by being supplied with a strong bond to the required position, it is possible to completely improve the conventional leak phenomenon by ensuring the perfect water tightness.

In addition, the conduit 1 and the flange 2 are integrally formed by a plurality of pins 4 inserted into the plurality of pinholes 211 formed by drilling through the insertion portion 21 to a part of the large conduit 1. Will you be firmly united? At this time, because the pin 4 used or the stop bolts 17 in the conventional design are perforated in the outer periphery of the conduit 1, if too many installations may affect the durability of the conduit 1, and thus There is no choice but to limit the location, which acts as a limiting factor in the firm coupling between the conduit 1 and the flange 2, and the method of preventing the welding part 5 to be described later plays a large role.

That is, the conduit 1 and the flange 2 are integrally steel due to the welding part 5 which is carried out at the end of the insertion part 21 of the flange 2 and the stepped portion formed between the outer circumference of the conduit 1. Combining tightly, it fills the gap in the stepped portion, and plays a big role in improving the safety and watertightness of the operator during transportation. And, since the large conduit 1 is usually made of cast iron, using a CO ₂ welder between the conduit 1 and the flange 2 can achieve a low-cost yet powerful joint.

According to another configuration of the present invention, in addition to the above-described configuration, it has a spot welding portion 51 which is implemented on the plurality of pinholes 211 into which the plurality of pins 4 are inserted, and the packing 3 is integrated at the upper and lower ends. It is a structure in which the bolt hole 31 is drilled to extend, which inherently seals that the pin 4 can be arbitrarily removed, thereby permanently guaranteeing the fixing force of the flange 2, and also extends the upper and lower parts to the packing 3. When the bolt hole 31 is formed to be inserted into the fixing bolt 6 at the time of fastening the fixing bolt 6 between the mounting portions 22 of the flange 2, the bolt hole 31 can be fixed in position.

As described above, the present invention utilizes the conventional flange-type connection method as it is, while providing a structure that can greatly improve the resistance to leakage, the cast iron pipe, which is a problem due to leakage, is deteriorated in durability and deterioration in the protection of surrounding facilities. In addition, it is economical by providing such a structure easily and inexpensively, and in particular, it is an effective and useful design that is devised to make an installation economy by making installation on site easy.

Claims (2)

An insertion portion 21 having an inner circumference into which the outer circumference of the large conduit 1 is tightly inserted, and a flange 2 which is a mounting portion 22 protruding upright from the insertion portion 21, are provided with Inserted at one end; A packing (3) attached simultaneously to the ends of the large conduit (1) and the flange (2); A plurality of pins 4 inserted into the plurality of pinholes 211 formed by drilling through the insertion portion 21 to a part of the large conduit 1; The flange joining structure of a large pipe which consists of a welding part 5 implemented in the step part formed between the end of the insertion part 21 of the said flange 2, and the outer periphery of the said conduit (1). The method of claim 1, The spot welding portion 51 is formed on the plurality of pin holes 211 into which the plurality of pins 4 are inserted, and the packing 3 extends integrally at the upper and lower ends thereof so that the bolt holes 31 are drilled. Flange joint structure of large pipe to be made.