JP2006090383A - Pipe and method for connecting the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide pipe and a method for connecting the same enabling connection of two pipes of different section shapes easily in short period of time. <P>SOLUTION: When the two pips 14, 17 of different section shapes are connected, the two pipes 14, 17 are connected via a flat plate 11 closing a gap between opening parts of the two pipes 14, 17 and provided with a hole part 12 communicating to the two pipes 14, 17. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a piping connection method and piping.

Conventionally, in order to connect two pipes having different cross-sectional shapes, for example, a pipe connection method as shown in Non-Patent Document 1 has been used. FIG. 15 is a plan view of the pipe connection method described in Non-Patent Document 1. As shown in FIG. 15, when connecting two different-diameter pipes 31 and 32 having a cylindrical cross section, for example, an outer truncated cone pipe between the large-diameter pipe 31 and the small-diameter pipe 32 to be connected. 30 are connected so as to be inserted.
Wada Inae "Shinki machine drafting revised edition" Jikkyo Publishing Co., Ltd. April 10, 1974 First printing issued P270-271

However, in this conventional pipe connection method, the circular truncated cone-shaped pipe 30 is different from a simple cylindrical pipe in that flat plates are rounded to match the diameters of the large diameter pipe 31 and the small diameter pipe 32, respectively. After that, since it is necessary to mold by cutting off an extra portion so as to have a frustoconical outer shape, there is a problem that it takes a lot of labor to process.
The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a pipe connection method capable of easily connecting two pipes having different cross-sectional shapes in a short time. To provide piping.

In the pipe connection method according to the first aspect of the present invention, when two pipes having different cross-sectional shapes are connected, a hole for closing the gap between the openings of the two pipes and communicating the two pipes The two pipes are connected to each other through a flat plate provided with.
Further, the pipe connection method according to claim 2 of the present invention is the pipe connection method according to claim 1, wherein a fitting member is fitted on the outer periphery of one of the two pipes, and the fitting is performed. A combination member and the flat plate are connected to connect the two pipes.

Furthermore, the pipe connection method according to claim 3 of the present invention is the pipe connection method according to claim 1 or 2, wherein the two pipes are cylindrical, and the flat plate has a diameter of the two pipes. It has an outer diameter dimension equal to or larger than the inner diameter of the larger pipe.
A pipe connection method according to a fourth aspect of the present invention is the pipe connection method according to the third aspect, characterized in that the two pipes are dust collection pipes of a coke oven.

Moreover, the piping which concerns on Claim 5 among this invention is a flat plate which provided the hole part which block | closes the clearance gap of the opening part of two piping for two piping from which cross-sectional shape differs, and connects the said two piping. It is characterized by being connected via.
According to a sixth aspect of the present invention, the pipe according to the sixth aspect is the pipe according to the fifth aspect, wherein a fitting member is fitted on an outer periphery of one of the two pipes, and the fitting member and the flat plate And the two pipes are connected.

The pipe according to claim 7 of the present invention is the pipe according to claim 5 or 6, wherein the two pipes are cylindrical, and the flat plate is a pipe having a larger diameter of the two pipes. It has an outer diameter dimension equal to or larger than the inner diameter.
According to an eighth aspect of the present invention, in the pipe according to the seventh aspect, the two pipes are dust collection pipes for a coke oven.

  According to the pipe connection method according to claim 1 and the pipe according to claim 5 of the present invention, when connecting two pipes having different cross-sectional shapes, the gap between the openings of the two pipes is closed, The two pipes are connected via a flat plate provided with a hole for communicating the two pipes. Since the flat plate can be easily obtained and molded, and the enforcement at the time of pipe connection is easy, it is possible to easily connect two pipes having different cross-sectional shapes in a short time.

  Moreover, according to the pipe connection method according to claim 2 and the pipe according to claim 6 of the present invention, a fitting member is fitted on the outer periphery of one of the two pipes, and the fitting member And the flat plate to connect the two pipes. By the fitting member, the flat plate and the pipe to which the fitting member is connected can be smoothly aligned at the time of pipe connection. By sliding the fitting member, it is possible to easily move between the two pipes. The gap can be closed.

Furthermore, according to the pipe connection method according to claim 3 and the pipe according to claim 7 of the present invention, the two pipes are cylindrical, and the flat plate has a larger diameter of the two pipes. The outer diameter is equal to or greater than the inner diameter of the pipe. For this reason, when connecting two cylindrical pipes having different cross-sectional shapes, the flat plate and the larger-diameter pipe can be reliably connected, and two cylindrical pipes having different cross-sectional shapes can be connected. It can be done reliably.
Furthermore, according to the pipe connection method according to claim 4 and the pipe according to claim 8 of the present invention, the pipe connection method according to claim 3 is used for connecting the dust collection pipe of the coke oven. For this reason, two dust collecting pipes of the coke oven can be easily connected in a short time.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a coke oven having a dust collection pipe to which the pipe connection method and the pipe according to the present invention are applied.
In FIG. 1, a furnace body 2 of a coke oven 1 includes a carbonizing chamber 3 into which coal is charged and a combustion chamber 4 in which gas is combusted, and the carbonizing chamber 3 and the combustion chamber 4 are furnaces. It is partitioned by wall bricks. Coal is heated and dry-distilled into coke by heat transmitted from the combustion chamber 4 in the carbonization chamber 3. Coke oven gas generated from the combustion chamber 4 (volatile components resulting from dry distillation of coal, mostly hydrocarbons) is sucked into the dry main 6 by an ejector (not shown) of the riser 5 and uses the coke oven gas. Sent to the facility. The produced coke is pushed out from one side by the extruder 7 after the furnace lids on both sides of the carbonization chamber 3 are removed, loaded on a fire extinguisher (not shown) disposed on the other side, and carried out. Cooled and used for blast furnace.

  When charging coal into the carbonization chamber 3, coal gas is released from the carbonization chamber 3. The coal charging gas is a mixture of gas remaining in the carbonization chamber 3, water vapor evaporating from coal, gas such as hydrocarbon which is a volatile component generated by thermal decomposition of coal, and coal dust. The discharged coal gas is sucked into the dry main 6 through the riser 5 so that the coal gas containing coal dust is prevented from leaking into the atmosphere, and the environment around the coke oven 1 is protected. It has been. However, if an attempt is made to increase the production amount of coke, the amount of coal gas generated tends to increase accordingly, and in that case, it becomes difficult to suck the entire amount of coal gas into the dry main 6.

  To cope with this problem, a technology is adopted in which a dust collection pipe 8 is installed in the coke oven 1 and a dust collector (not shown) is installed downstream of the dust collection pipe 8 to suck the remaining coal gas. Has been. For this purpose, the remainder of the coal gas is sucked from the inlet 9 to the dust collecting pipe 8 via a suction machine (not shown), and the coal gas sucked through the dust collecting pipe 8 is passed through a dust collector (not shown). By removing the dust that pollutes the environment, it is released into the atmosphere.

In recent years, the size of the dust collection pipe 8 has been increased, and the old dust collection pipe 8 has been updated, and the existing dust collection pipe 8 may be replaced with a new one. In the replacement work of the dust collection pipe 8, the interruption of the continuous operation of the coke oven 1 must be suppressed as much as possible. This is to suppress a decrease in the amount of coke produced and to suppress the furnace body 2 of the coke oven 1 from being cooled and thermally contracted to cause damage such as joint cracks. Accordingly, the replacement work of the dust collection pipe 8 is performed between the operations of charging the coal into the carbonization chamber 3 to suppress interruption of continuous operation of the coke oven 1 as much as possible.
Specifically, the operation is interrupted little by little, and the operation of exchanging 5 m of the dust collection pipe in 5 hours in one interruption is divided into several times over the entire length of the pipe.

Hereinafter, a method for replacing the dust collection pipe will be described.
FIG. 2 is a perspective view of a flat plate connecting the old dust collection pipe and the new dust collection pipe. FIG. 3 is a side view of the old dust collection pipe. FIG. 4 is a side view of the old dust collection pipe with the replacement part 16 removed. FIG. 5 is a side view of a state in which a flat plate and a new dust collecting pipe are connected. FIG. 6 is a side view showing a state in which the old dust collection pipe and the new dust collection pipe are connected via a flat plate.

  As shown in FIG. 2, the flat plate 11 is formed in a substantially disc shape, and when the old dust collection pipe 14 and the new dust collection pipe 17 having different cross-sectional shapes are connected to each other, A gap in the opening caused by a difference in cross-sectional shape between the dust collection pipe 14 and the new dust collection pipe 17 can be closed. When the flat plate 11 is inserted between the old dust collection pipe 14 and the new dust collection pipe 17, the old dust collection pipe 14 and the new dust collection pipe 17 are communicated with the surface of the flat plate 11. In addition, a substantially circular hole 12 is provided at a position eccentric to the outer shape of the flat plate 11. The outer diameter of the flat plate 11 is formed to be greater than the inner diameter of the new dust collection pipe 17, which has the larger inner diameter among the old dust collection pipe 14 and the new dust collection pipe 17 connected to each other. The outer shape of the flange portion 18 of the piping 17 is formed. Further, the inner diameter of the hole 12 of the flat plate 11 is formed to be equal to or smaller than the inner diameter of the opening of the old dust collection pipe 14 which is the smaller one of the old dust collection pipe 14 and the new dust collection pipe 17 connected to each other. Has been. A plurality of bolt holes 13 are provided on the outer periphery of the hole 12 of the flat plate 11.

First, when exchanging the dust collection pipe 8, the old dust collection pipe 14 (the exchanged dust collection pipe 8) is gas cut along a cutting line a across the old dust collection pipe 14, as shown in FIG. The non-exchange part 15 and the exchange part 16 are cut by, for example. Then, as shown in FIG. 4, the replacement part 16 of the old dust collection pipe 14 is removed.
As shown in FIG. 5, the new dust collection pipe 17 is formed larger in diameter than the old dust collection pipe 14, and a flange portion 18 is formed in advance on the outer periphery of the opening.
Then, as shown in FIG. 5, the flat plate 11 and the flange portion 18 are overlapped with side portions designed to have the same outer shape, so that the entire hole portion 12 falls inside the inner diameter of the new dust collection pipe 17. After adjusting the positional relationship, it is fixed with a bolt (not shown).

Next, as shown in FIG. 6, the opening side surface b of the non-exchange part 15 of the old dust collection pipe 14 and the new dust collection pipe 17 to which the flat plate 11 is connected to the end are opposed to each other.
Then, the end of the new dust collecting pipe 17 to which the flat plate 11 is connected and the opening side surface b of the non-exchange part 15 are welded so that the entire hole part 12 is inside the inner diameter of the non-exchange part 15. To connect.
This operation is repeated several times until the total length of the old dust collection pipe 14 is replaced with the new dust collection pipe 17, whereby the total length of the dust collection pipe is replaced.
In the above method, since the flat plate 11 can be easily obtained and molded, and the enforcement at the time of pipe connection is easy, two pipes having different cross-sectional shapes can be easily connected in a short time.

Next, another method for replacing the dust collection pipe will be described with reference to FIGS.
FIG. 7 is a perspective view of the fitting member. FIG. 8 is a side view of a state in which a fitting member is inserted into the old dust collection pipe. FIG. 9 is a side view when the old dust collection pipe and the new dust collection pipe are connected. FIG. 10 is a side view showing a state where the old dust collection pipe and the new dust collection pipe are connected using a flat plate and a fitting member.

As shown in FIG. 7, the fitting member 20 is a substantially cylindrical tubular body, and the fitting member 20 has an inner diameter of the old dust collection pipe 14 and the new dust collection pipe 17 connected to each other. It is designed so that it can be fitted on the outer periphery of the old dust collection pipe 14 having the smaller inner diameter.
First, when exchanging the dust collection pipe 8, the old dust collection pipe 14 (the exchanged dust collection pipe 8) is gas cut along a cutting line a across the old dust collection pipe 14, as shown in FIG. The non-exchange part 15 and the exchange part 16 are cut by, for example. Then, as shown in FIG. 4, the replacement part 16 of the old dust collection pipe 14 is removed.

As shown in FIG. 5, the new dust collection pipe 17 is formed larger in diameter than the old dust collection pipe 14, and a flange portion 18 is formed in advance on the outer periphery of the opening.
Then, as shown in FIG. 5, the flat plate 11 and the flange portion 18 are overlapped with side portions designed to have the same outer shape, so that the entire hole portion 12 falls inside the inner diameter of the new dust collection pipe 17. After adjusting the positional relationship, it is fixed with a bolt (not shown).

Next, as shown in FIG. 8, the fitting member 20 is slid in the axial direction of the non-exchange part 15 (left and right direction in FIG. 8), and the fitting member 20 is inserted into the opening side of the non-exchange part 15. To do.
Further, as shown in FIG. 9, the opening side surface d of the fitting member 20 and the new dust collection pipe 17 to which the flat plate 11 is connected to the end are opposed to each other.
Further, as shown in FIG. 10, the fitting member 20 is slid in the direction of the flat plate 11, and the new dust collection pipe 17 connected to the end portion of the flat plate 11 and the opening side surface d of the fitting member 20. The new dust collection pipe 17 connected to the end of the flat plate 11 and the opening side surface outer peripheral portion d of the fitting member 20 are brought into contact with each other so that the entire hole portion 12 is inside the inner diameter of the fitting member 20. In addition, welding is performed and the fitting member 20 and the non-replaceable portion 15 are connected by welding the outer peripheral portion C of the side surface.

This operation is repeated several times until the total length of the old dust collection pipe 14 is replaced with the new dust collection pipe 17, whereby the total length of the dust collection pipe is replaced.
In the above method, the flat plate 11 and the non-exchange part 15 of the old dust collecting pipe 14 can be aligned smoothly when the pipe is connected by the fitting member, and the fitting member 20 can be easily slid. A gap between the non-exchange part 15 of the old dust collection pipe 14 and the new dust collection pipe 17 can be closed.

Here, still another method for replacing the dust collecting pipe will be described with reference to FIGS.
FIG. 11 is a perspective view of the fitting member. FIG. 12 is a side view of a state in which a fitting member is inserted into the old dust collection pipe. FIG. 13 is a side view when the old dust collection pipe and the new dust collection pipe are connected. FIG. 14 is a side view showing a state in which the old dust collection pipe and the new dust collection pipe are connected using a flat plate and a fitting member.

As shown in FIG. 8, the fitting member 21 is composed of semi-cylindrical bodies 22 and 23 obtained by dividing a substantially cylindrical tubular body into two parts.
First, when replacing the dust collecting pipe 8, the old dust collecting pipe 14 (the dust collecting pipe 8 to be replaced) is replaced with gas or the like along a cutting line a across the old dust collecting pipe 14, as shown in FIG. To cut into the non-exchange part 15 and the exchange part 16. Then, as shown in FIG. 4, the replacement part 16 of the old dust collection pipe 14 is removed.

As shown in FIG. 5, the new dust collection pipe 17 is formed larger in diameter than the old dust collection pipe 14, and a flange portion 18 is formed in advance on the outer periphery of the opening.
Then, as shown in FIG. 5, the flat plate 11 and the flange portion 18 are overlapped with side portions designed to have the same outer shape, so that the entire hole portion 12 falls inside the inner diameter of the new dust collection pipe 17. After adjusting the positional relationship, it is fixed with a bolt (not shown).

Next, as shown in FIG. 12, the semi-cylindrical bodies 22 and 23 are combined and covered on the outer periphery of the opening of the non-exchange part 15 so as to be substantially cylindrical, and the semi-cylindrical body 22 and the semi-cylindrical body 23 are covered. The joint surface e is welded. Thereby, the fitting member 21 can be slid in the axial direction of the non-exchange part 15 (left-right direction in FIG. 12).
Furthermore, as shown in FIG. 13, the opening side surface outer peripheral part g of the fitting member 21 and the new dust collection pipe 17 to which the flat plate 11 is connected to the end part are opposed to each other.

  Then, as shown in FIG. 14, the fitting member 21 is slid in the direction of the flat plate 11, and the new dust collection pipe 17 connected to the end of the flat plate 11 and the opening side peripheral portion g of the fitting member 21. And the new dust collection pipe 17 connected to the end of the flat plate 11 and the opening side surface g of the fitting member 21 so that the entire hole 12 is inside the inner diameter of the fitting member 21. As well as welding, the fitting member 21 and the side surface outer peripheral part f of the non-exchange part 15 are connected by welding.

This operation is repeated several times until the total length of the old dust collection pipe 14 is replaced with the new dust collection pipe 17, whereby the total length of the dust collection pipe is replaced.
In the above method, the flat plate 11 and the non-exchange part 15 of the old dust collecting pipe 14 can be aligned smoothly when the pipe is connected by the fitting member, and the fitting member 21 can be easily slid. A gap between the non-exchange part 15 of the old dust collection pipe 14 and the new dust collection pipe 17 can be closed.

As mentioned above, although embodiment of this invention was described, this invention is not limited to this, A various change and improvement can be performed.
For example, the pipe connection method according to the present invention can be used for connection of various pipes other than the connection of the dust collection pipe of the coke oven.
Moreover, the pipe connection method according to the present invention is not limited to the connection of cylindrical pipes, and can be used for ducts having a cross-sectional angle.

Alternatively, the shape of the flat plate 11 does not need to be substantially circular, and can be changed as appropriate. In addition, the flat plate 11 may be welded directly to the end of the pipe without being fixed by the flange 18 and the bolt, Furthermore, the hole 12 does not need to be provided at a position knitted from the center of the side surface of the flat plate 11, and may be provided at the center of the side surface of the flat plate 11.
In the above-described embodiment, the flat plate 11 is preliminarily connected to the new dust collection pipe 17 side, and this is preferable because the replacement work can be performed in a short time. Even if welding is performed on the pipe 14 side during replacement work, the present invention is established.

In this case, if the fitting members 20 and 21 are used, the one fitted on the new dust collection pipe 17 side is slid.
In addition, the end portions in the axial direction of the fitting members 20 and 21 do not need to protrude in advance from the end portions of the pipes, and any dimension that protrudes when sliding is sufficient.
Finally, in all of the embodiments described above, the case where the new dust collection pipe 17 is larger in diameter than the old dust collection pipe 14 has been described. Needless to say, it is established without any problems.

1 is a perspective view of a coke oven having a dust collection pipe to which a pipe connection method and pipe according to the present invention are applied. It is a perspective view of the flat plate which connects the old dust collection piping and the new dust collection piping. It is a side view of the old dust collection pipe. It is a side view of the state which removed the exchange part of the old piping for dust collection. It is a side view of the state which connected the flat plate and piping for new dust collection. It is a side view of the state which connected the piping for old dust collection and the piping for new dust collection using a flat plate. It is a perspective view of a fitting member. It is a side view of the state where the fitting member was inserted in the old dust collection pipe. It is a side view at the time of connecting the old dust collection piping and the new dust collection piping. It is a side view showing the connection state of the old dust collection pipe and the new dust collection pipe using the flat plate and the fitting member. It is a perspective view of a fitting member. It is a side view of the state where the fitting member was inserted in the old dust collection pipe. It is a side view at the time of connecting the old dust collection piping and the new dust collection piping. It is a side view which shows the state of the connection of the piping for old dust collection and the piping for new dust collection using a flat plate and a fitting member. It is a top view which shows the connection method of the conventional piping.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coke oven 2 Furnace 3 Carbonization chamber 4 Combustion chamber 5 Rising pipe 6 Dry main 7 Extruder 8 Dust collection pipe 9 Drainage inlet 11 Flat plate 12 Hole part 13 Bolt hole 14 Old dust collection pipe 15 Non-exchange part 16 Exchange part 17 New dust collection pipe 18 Flange portion 20 Fitting member 21 Fitting member 22 Semi-cylindrical body 23 Semi-cylindrical body a Cutting line b Opening side surface c Side surface outer peripheral portion d of non-exchange portion Opening side surface of fitting member Outer peripheral portion e Joint surface f Side surface outer peripheral portion g of non-exchanged portion Opening portion side outer peripheral portion 30 of fitting member Outer circular truncated conical pipe 31 Large diameter pipe 32 Small diameter pipe

Claims (8)

  When connecting two pipes having different cross-sectional shapes, the two pipes are connected via a flat plate that closes a gap between the openings of the two pipes and has a hole that communicates the two pipes. A piping connection method characterized by the above.   The fitting pipe is inserted in the outer circumference of one of the two pipes, the fitting member and the flat plate are connected, and the two pipes are connected. Piping connection method.   The pipe connection method according to claim 1 or 2, wherein the two pipes are cylindrical, and the flat plate has an outer diameter dimension equal to or larger than an inner diameter of a pipe having a larger diameter among the two pipes. .   The pipe connection method according to claim 3, wherein the two pipes are pipes for collecting dust in a coke oven.   A pipe characterized in that two pipes having different cross-sectional shapes are connected via a flat plate provided with a hole that closes a gap between openings of the two pipes and communicates the two pipes.   6. The fitting according to claim 5, wherein a fitting member is inserted into an outer periphery of one of the two pipes, the fitting member and the flat plate are connected, and the two pipes are connected. Piping.   The pipe according to claim 5 or 6, wherein the two pipes are cylindrical, and the flat plate has an outer diameter dimension equal to or larger than an inner diameter of a pipe having a larger diameter among the two pipes.   The pipe according to claim 7, wherein the two pipes are dust collecting pipes for a coke oven.

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