JPH08226586A - Pipe with flange joint of same diameter - Google Patents

Abstract

PURPOSE: To omit almost all of removal work of residual air and galvanizing liquid in a galvanizing treatment process. CONSTITUTION: A pipe 1 with a same diametrical flange joint is constituted by fastening a joint 3 on an end part of a pipe main body 2. An outside diameter of the joint 3 is equal to an outside diameter of the pipe main body 2, an outside diameter is smaller than an inside diameter of the pipe main body 2 at an outside end 5 and is roughly equal to the inside diameter of the pipe main body 2 at an inside end 9. A plural number of recessed parts 4 are formed on an outer periphery of the joint 3, and a bolt insertion hole 6 in the axial direction is formed between an end surface 11 of each of the recessed parts 4 and an outside end 5 of the joint 3. A small exhaust hole 7 passing in the radial direction through to the inner peripheral side of the joint 3 is formed in each of the recessed parts 4. An exhaust groove 8 extending in the axial direction positioned in the middle of the adjoining recessed parts 4, 4 and deep enough to almost reach an inner peripheral surface of the pipe main body 2 is formed on the inner peripheral side of the coupler 3. Air or galvanizing liquid is easily exhausted from the exhaust groove 8 or the small exhaust hole 7 in a galvanizing process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe which can be used for columns and beams of a support structure of a train track, and has a so-called same diameter with a connecting flange portion having the same diameter as the pipe body at its end. The present invention relates to a pipe with a flange joint.

[0002]

2. Description of the Related Art An example of a conventional pipe with a flange joint of the same diameter is shown in FIGS. FIG. 6 is a front view of a conventional pipe with the same diameter flange joint, and FIG. 7 is a side view in which a part of the conventional pipe with the same diameter flange joint is cut away. At both ends of the pipe body P of the pipe with the same diameter flange joint, the flange joint F having the same diameter as the pipe main body P is attached.
It is made by welding. The same-diameter flange joint F is a short cylindrical shape having a wall thickness that is equal to the outer diameter of the pipe body P and an inner diameter that is smaller than the inner diameter of the pipe body P. The joint F has a plurality of (for example, six) recesses a on the outer circumference. The recess a is
Bolt insertion holes b penetrating in the axial direction are provided between the end faces of the recesses a and the outer end face d of the joint F, which are provided at equal intervals in the circumferential direction.

If this pipe with a flange joint of the same diameter is used for a pillar or a beam of a gate-type support structure of a train line, the flange is not overhanging, so that the band metal fitting can be freely moved and the external appearance can be obtained. There are advantages such as a good appearance. However, since the support structure of the train track is provided close to the running path of the train, its maintenance and inspection are
It will be done quickly at night after driving so as not to hinder the running of the train. Therefore, as for the supporting structure, a durable and high-quality supporting structure is desired. For pipes with a flange joint of the same diameter, if this is used as a support structure for a train track,
In order to prevent rusting due to internal dew condensation and infiltration of rainwater,
High quality hot-dip galvanized inside and outside the tube is required.
Conventionally, when performing a plating treatment such as hot dip galvanizing on a pipe with a flange joint of the same diameter, for example, it is performed by suspending it in a slightly inclined state and immersing it in a plating solution.
At this time, air remains in the upper part of the step c formed in the connection part with the joint F in the pipe body P and in the recess a located below the joint F, and plating remains as it is. There will be a part that does not adhere. Therefore, in order to remove the former air, the entire pipe with a joint is further inclined in the plating solution, and then, in order to remove the latter air, the pipe with a joint is rotated once about the axis. When the liquid is pulled up from the plating solution, the plating solution remains in the lower part of the annular step c and in the recess a on the upper side of the joint F, which causes unevenness in the plating. , The entire pipe with a joint is further inclined, and then, in order to discharge the latter plating solution, the pipe with a joint is rotated once about the axis. In this way, it is necessary to carry out a troublesome work both at the time of dipping and at the time of pulling up, and not only the work efficiency is significantly lowered, but also the quality is deteriorated due to uneven plating.

[0004]

Therefore, according to the present invention, the work of removing the residual air and the plating solution can be almost omitted in the plating process, and the work efficiency can be improved.
It is an object of the present invention to provide a pipe with a flange joint of the same diameter, which is of high quality, has high reliability, and is durable even when used for a support structure of a train track, etc. and does not require maintenance or inspection.

[0005]

According to the present invention, in order to solve the above-mentioned problems, a pipe 1 with a flange joint having the same diameter is fixed to an end portion of a pipe main body 2 by a flange joint 3 having the same diameter. Make up. The outer diameter of the same-diameter flange joint 3 is equal to the outer diameter of the pipe body 2, and the inner diameter is at the outer end 5 of the pipe body 2.
Is smaller than the inner diameter of the tube body 2 and is substantially equal to the inner diameter of the tube body 2 at the inner end 9. On the outer circumference of the same diameter flange joint 3,
A plurality of concave portions 4 are formed at equal intervals in the circumferential direction. A bolt insertion hole 6 penetrating in the axial direction is formed between the end surface 11 of each recess 4 and the outer end 5 of the flange joint 3 of the same diameter. A discharge small hole 7 is formed near the end face 11 of each recess 4 on the inner peripheral side of the flange joint 3 of the same diameter in the radial direction. On the inner peripheral side of the same-diameter flange joint 3, adjacent concave portions 4,
A discharge groove 8 extending in the axial direction is formed in the middle of 4 to a depth substantially reaching the inner peripheral surface of the tube body 2.

[0006]

In the pipe 1 with a flange joint having the same diameter of the present invention, since a large step portion cannot be formed in the connection portion 10, it is difficult for air to remain therein when immersed in the plating solution, and even if it remains, the discharge groove will remain. 8 is easily discharged, and when the plating liquid is pulled up, similarly, the plating liquid is unlikely to remain here, and even if it remains, it is easily discharged from the discharge groove 8. Further, since the discharge small hole 7 penetrating to the inner peripheral side of the joint 3 is provided in the recessed portion 4, the air remaining in the recessed portion 4 during the immersion in the plating solution is discharged from the discharge small hole 7 through the discharge small hole 7. The liquid is easily discharged through the inner peripheral side, and similarly when the liquid is pulled up from the plating liquid, the plating liquid in the recess 4 is easily discharged through the small discharge hole 7 through the inner peripheral side and stays there. There is no. Therefore, it is free from uneven plating, has high quality, is highly reliable, and has durability even when it is used for a support structure of a train track, etc., and requires no maintenance or inspection.

[0007]

An embodiment of the present invention will be described with reference to the drawings. 1 is a front view of a pipe with the same diameter flange joint according to the present invention, FIG. 2 is a front view of an end portion of the pipe with the same diameter flange joint according to the present invention, and FIG. 3 is a pipe with the same diameter flange joint according to the present invention A side view with a part cut away, FIG. 4 is IV-IV in FIG.
FIG. 5 is a sectional view taken along line VV in FIG.

In FIGS. 1 and 2, a pipe 1 with a flange joint having the same diameter is constructed by welding flange joints 3 having a substantially short cylindrical shape on both ends of a pipe body 2 on the same axis.
As shown in FIGS. 2 and 4, the flange joint 3 has an outer diameter
The inner diameter of the tube body 2 is equal to the outer diameter of the tube body 2 and is smaller than the inner diameter of the tube body 2 at the outer end 5, gradually increases toward the inner end 9, and is substantially equal to the inner diameter of the tube body 2 at the inner end 9. At the inner end 9 of the flange joint 3, a large step portion is not formed on the inner circumference of the connection portion with the pipe body 2.

On the outer periphery of the flange joint 3, there are six recesses 4 in the present example, which are similar to the half of a bell, and the flat end face 11 thereof.
Are arranged at equal intervals in the circumferential direction with respect to the outer end 5. The recessed portion 4 gradually increases in depth from the inner end 9 toward the outer end 5 and is deepest in the vicinity of the end face 11. The flange joint 3 has an end surface 11 of each recessed portion 4.
A bolt insertion hole 6 penetrating in the axial direction from the outer end 5 to the outer end 5 is formed.

As shown in FIG. 4, a discharge small hole 7 that penetrates from the deepest portion near the end face 11 to the inner peripheral side of the flange joint 3 radially penetrates each recess 4.

On the inner peripheral side of the flange joint 3, as shown in FIGS. 3 and 5, it is located in the middle of the adjacent recesses 4, and in this example, is close to the inner peripheral surface of the pipe body 2. The depth discharge groove 8 is formed in the axial direction from the inner end 9 of the flange joint 3 toward the outer end 5.

When the pipe 1 with a flange joint having the same diameter of this embodiment is plated, the pipe is hung in a slightly inclined state with the discharge grooves 8 facing the diametrical direction of each flange joint 3 oriented vertically. When immersed in the plating solution, not only the air in the pipe body 2 but also the air that tends to remain in the upper part of the connecting portion 10 is discharged from the opening of the outer end 5 of the flange joint 3 through the upper discharge groove 8. It Further, the air remaining in each recess 4 of the flange joint 3 is discharged through the discharge small holes 7, respectively.

When the pipe 1 with the same diameter flange joint is immersed in the plating solution with the discharge grooves 8 facing each other in the diametrical direction of each joint 3 oriented vertically, the pipe 1 is inserted into the upper concave portion 4 of the connecting portion 10. Although some air remains in the vicinity of the corresponding portion, if the pipe 1 with the same diameter flange joint is slightly rotated left or right about the axis and the adjacent discharge groove 8 is directed right above, residual air is also left. All are discharged.

When the pipe 1 with the same diameter flange joint is pulled up from the plating liquid, not only the plating liquid in the pipe body 2 but also the plating liquid which tends to remain in the lower portion of the connecting portion 10 are drained.
The plating solution that has flowed out through the discharge hole 7 and has remained in the upper recess 4 of the joint 3 flows out through the discharge small hole 7.

When the pipe 1 with a flange joint of the same diameter is pulled up from the plating solution with the diametrically opposed recesses 4 in each joint 3 oriented vertically, the pipe 1 is rotated slightly to the left or right about the axis. If so, the residual plating solution is easily discharged.

[0016]

As described above, according to the present invention, when the pipe 1 with the same diameter flange joint is immersed in the plating solution with the discharge groove 8 oriented vertically, the air in the pipe is automatically discharged. 8 is discharged to the outside through the discharge groove 8, and if the discharge groove 8 is vertically pulled up from the plating liquid, the plating liquid inside the pipe is discharged to the outside through the discharge groove 8 and the plating inside the recess 4 is performed. The liquid is discharged to the outside through the small discharge hole 7. Further, even when the pipe is immersed in and pulled up from the plating solution without directing the discharge groove 8 in the vertical direction, air or the plating solution can be easily discharged similarly by rotating the tube slightly about the axis. . Therefore, in the plating process, the work of removing residual air and plating liquid can be largely omitted, and the product is free from uneven plating and of high quality, making it ideal for application to the support structure of train tracks. Therefore, it is possible to simplify difficult maintenance and inspection work.

[Brief description of drawings]

FIG. 1 is a front view of a pipe with a flange joint of the same diameter according to the present invention.

FIG. 2 is a front view of an end portion of a pipe with a flange joint of the same diameter according to the present invention.

FIG. 3 is a side view in which a pipe with a flange joint of the same diameter according to the present invention is partially cut away.

4 is a sectional view taken along line IV-IV in FIG.

5 is a sectional view taken along line VV in FIG.

FIG. 6 is a front view of a conventional pipe with a flange joint of the same diameter.

FIG. 7 is a side view in which a part of a conventional pipe with a flange joint having the same diameter is cut away.

[Explanation of symbols]

 1 Pipe with Flange Joint with Same Diameter 2 Pipe Main Body 3 Flange Joint with Same Diameter 4 Recessed Part 5 Outer End of Joint 6 Bolt Insertion Hole 7 Discharge Small Hole 8 Discharge Groove 9 Inner End of Joint 10 Connection Part 11 End Face of Recessed Part

Front page continued (72) Inventor Takeshi Fujiwara 1-6-5 Marunouchi, Chiyoda-ku, Tokyo Within East Japan Railway Company (72) Inventor Noboru Nakamura 6-5-19 Minami-Shinagawa, Shinagawa-ku, Tokyo Sanwa (72) Inventor Hideo Omori 6-5-19 Minami-Shinagawa, Shinagawa-ku, Tokyo Sanwa Tech-Inc. (72) Inventor Mitsuharu Mochida 4-23-23, Kamiaoki Nishi, Kawaguchi City, Saitama Prefecture

Claims (1)

[Claims] 1. A pipe main body and a flange joint of the same diameter fixed concentrically to the end of the pipe main body, wherein the outer diameter of the same diameter flange joint is equal to the outer diameter of the pipe body. Equal to each other, the inner diameter is smaller than the inner diameter of the pipe body at the outer end and substantially equal to the inner diameter of the pipe body at the inner end, and a plurality of recesses are formed at equal intervals in the circumferential direction on the outer periphery of the same diameter flange joint, A bolt insertion hole penetrating in the axial direction is formed between the end surface of each recess and the outer end surface of the same diameter flange joint, and inside each recess, on the inner peripheral side of the same diameter flange joint. , A discharge small hole penetrating in the radial direction is formed, and on the inner peripheral side of the flange joint of the same diameter, it is located in the middle of adjacent concave portions and has a depth of almost reaching the inner peripheral surface of the pipe body. A discharge groove extending in the axial direction is formed. Flange joint with tube.