JP2019095006A - Pipe joint structure - Google Patents

Abstract

To make a housing follow deformation in a case where a first pipe or a second pipe deforms flatly.SOLUTION: A pipe joint structure 10 comprises a first pipe 11, a second pipe 12 connected to the first pipe 11, and a splittable housing 20 surrounding the first pipe 11 and the second pipe 12. Each split portion 21 of the housing 20 has a projection part 22 and a reception part 23. The projection part 22 is inserted into the reception part 23 in a non-contact manner by fastening coupling means 30, and a first circumferential concave surface 33 and a second circumferential concave surface 34 respectively contact with an outer peripheral surface of the first pipe 11 and an outer peripheral surface of the second pipe 12.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pipe joint structure for a large-sized pipe, and more particularly to a pipe joint structure capable of preventing water leakage from the pipe.

  Conventionally, as a piping joint structure for large-sized piping, large-diameter first piping and second piping, a dividable housing that surrounds the joint between the first piping and the second piping from the outside, the first piping, and the first piping 2. Description of the Related Art It is known to provide a joint of two pipes and a rubber ring interposed between the housing and the joint.

Such a pipe joint structure joins the large diameter first pipe and the second pipe, and when the pipe joint structure is attached, the divided parts of the housing are in close contact with each other.

  On the other hand, if the supporting structure of the first and second pipes is defective, the first and second pipes may be damaged by the weight of the first and second pipes or the load of the fluid in the first and second pipes. When a shear load is applied, these loads may cause the first pipe and the second pipe to be deformed into a flat shape. As described above, even if the first and second pipes are flat, since the divided parts of the housing are in close contact with each other as described above, the housing has a flat deformation of the first and second pipes. As a result, a gap is formed between the housing and the first pipe or the second pipe, and the water blocking function is reduced.

  The present invention has been made in consideration of such a point, and even if the first pipe or the second pipe is deformed into a flat shape by applying a shear load to the first pipe or the second pipe, the housing and the first pipe may be used. It is an object of the present invention to provide a pipe joint structure in which no gap is formed between the pipe and the second pipe, and the deterioration of the water blocking function can be prevented.

  The present invention relates to a first pipe, a second pipe joined to the first pipe, a dividable housing that surrounds a joint between the first pipe and the second pipe from the outside, the first pipe and The housing includes the second pipe and a rubber ring interposed between the housing, and the housing has a plurality of divided parts and fastening means for tightening the divided parts, each divided part being a circle A projecting portion provided at both ends along the circumferential direction and projecting in the circumferential direction toward the adjacent divided portion, and a receiving portion for receiving the projecting portion of the adjacent divided portion, and tightening the fastening means Thus, the projecting portion of each divided portion enters without receiving into the receiving portion of the adjacent divided portion, and the first circumferential groove and the second circumference are formed on the outer peripheral surface of the first pipe and the outer peripheral surface of the second pipe. Grooves are respectively provided, and each of the divided portions A first circumferential projection and a second circumferential projection are provided, which are fitted into the circumferential groove and the second circumferential groove, and axially inward of the first circumferential projection and the second circumferential projection, A first circumferential concave surface and a second circumferential concave surface are formed, and by tightening the fastening means, the first circumferential protrusion and the second circumferential protrusion serve as the bottom of the first circumferential groove and the second circumferential groove. A piping joint structure in which the first circumferential concave surface and the second circumferential concave surface abut on the bottom of the circumferential groove or the outer circumferential surface of the first pipe and the outer circumferential surface of the second pipe. is there.

  The present invention is a pipe joint structure in which the first circumferential concave surface and the second circumferential concave surface abut the outer peripheral surface of the first pipe and the outer peripheral surface of the second pipe by tightening the fastening means. It is.

  As described above, according to the present invention, even if the first pipe and the second pipe are flat, no gap is formed between the housing and the first pipe and the second pipe, and the water blocking function is reduced. Can be prevented.

FIG. 1 is a side sectional view showing an embodiment of a pipe joint structure, and is a sectional view taken along line B-B of FIG. FIG. 2 is a view on arrow AA of FIG. 1. The figure which shows the effect | action of this invention. The figure which shows the effect | action of this invention. The figure which shows the effect | action of this invention.

Embodiment of the Invention

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 5 show an embodiment of a pipe joint structure according to the present invention.

  Here, FIG. 1 is a side sectional view showing one embodiment of the pipe joint structure, and is a sectional view taken along the line B-B in FIG. 2, and FIG. 2 is a view taken along the line A-A in FIG.

  3 to 5 are views similar to FIG. 2 showing the operation of the pipe joint structure according to the present invention.

  First, an outline of a pipe joint structure according to the present invention will be described with reference to FIGS. 1 and 2.

  As shown in FIGS. 1 and 2, the pipe joint structure 10 includes a cylindrical first pipe 11, a cylindrical second pipe 12 joined to the first pipe 11, a first pipe 11 and a second pipe 12. And a cylindrical member interposed between the outer peripheral surface of the first pipe 11 and the second pipe 12 and the inner peripheral surface of the housing 20. And a rubber ring 15 in the shape of a circle.

  Among them, the first pipe 11 and the second pipe 12 are large pipes having an outer diameter of approximately 300 mm or more, and both are made of cast iron pipe or steel pipe.

  The rubber ring 15 is provided along the entire circumference of the outer peripheral surface of the first pipe 11 and the second pipe 12.

  The housing 20 as a whole is made of cast iron or steel, and a plurality of, for example, four, divided parts 21, 21, 21, 21 divided along the circumferential direction, and between the divided parts 21, 21, 21, 21 And four fastening means 30 for fastening. The fastening means 30 has a bolt pad 25 provided on one side of each divided portion 21 and a bolt pad 26 provided on the other side, and a bolt nut 28 is fitted between the bolt pads 25 and 26. By tightening, each divided portion 21 can be tightened.

  Next, each divided portion 21, 21, 21, 21 of the housing 20 will be further described. At both ends along the circumferential direction of each divided portion 21, a protruding portion 22 protruding toward the adjacent divided portion 21 and a receiving portion 23 for receiving the protruding portion 22 of the adjacent divided portion are respectively provided.

  In the example shown in FIG. 2, when the protrusion 22 is provided below one end of a certain divided part 21 and the receiving part 23 is provided above it, the receiving part is provided below the other end of 21 of the divided part. 23 is provided, and a protrusion 22 is provided above it.

  In this case, the projecting portions 22 and the receiving portions 23 provided on both sides of each divided portion 21 do not abut on the receiving portions 23 and the projecting portions 22 of the adjacent divided portions 21 and are separated by a predetermined distance. .

  Further, as shown in FIG. 1, a first circumferential groove 11A and a second circumferential groove 12A are respectively provided on the outer circumferential surface of the first pipe 11 and the outer circumferential surface of the second pipe 12. Further, in each divided portion 21 of the housing 20, a first circumferential projection 31 and a second circumferential projection 32 which are fitted into the first circumferential groove 11A and the second circumferential groove 12A are respectively provided.

  Furthermore, in each divided portion 21 of the housing 20, a first circumferential concave surface 33 and a second circumferential concave surface 34 are respectively formed inward in the axial direction of the first circumferential protrusion 31 and the second circumferential protrusion 32. ing.

  Here, the “axial direction” refers to the direction along the axis L of the first pipe 11 and the second pipe 12, and the “axially inward” refers to the joint along the axial direction L in the first pipe 11. The direction on the part 10A side is referred to, and in the second pipe 12, the direction on the joint part 10A side along the axial direction L is referred to.

  In FIG. 1 and FIG. 2, when the bolt nuts 28 of the four fastening means 30 are tightened, the protrusion 22 of each divided portion 21 enters into the receiving portion 23 of the adjacent divided portion 21 as described above. .

  At this time, the first circumferential concave surface 33 of each divided portion 21 of the housing 20 abuts on the contact surface 11 B of the outer circumferential surface of the first pipe 11, and the second circumferential concave surface 34 is the outer circumference of the second pipe 12. It abuts against the abutment surface 12B of the surface.

  When the four fastening means 30 are tightened, the first circumferential concave surface 33 and the second circumferential concave surface 34 are the same as the contact surface 11 B of the outer peripheral surface of the first pipe 11 and the outer peripheral surface of the second pipe 12. Instead of abutting on the contact surface 12 B, the first circumferential protrusion 31 and the second circumferential protrusion 32 of each divided portion 21 of the housing 20 are the bottom of the first circumferential groove 11 A of the first pipe 11 and the second pipe 12. It may be in contact with the bottom of the second circumferential groove 12A.

  Thus, the first circumferential protrusion 31 and the second circumferential protrusion 32 are fitted in the first circumferential groove 11A of the first pipe 11 and the second circumferential groove 12A of the second pipe 12 in the divided portion 21 of the housing 20. The first circumferential concave surface 33 and the second circumferential concave surface 34 respectively abut the outer circumferential surface of the first pipe 11 and the outer circumferential surface of the second pipe 12 by tightening the fastening means 30 or Alternatively, the first circumferential projection 31 and the second circumferential projection 32 abut on the bottom of the first circumferential groove 11A and the bottom of the second circumferential groove 12A. As a result, even if the housing 20 is displaced in one radial direction with respect to the first pipe 11 and the second pipe 12, from the divided portions 21 of the housing 20 in the other radial direction side, It is possible to reliably prevent the first pipe 11 or the second pipe 12 from coming off in the axial direction.

  By the way, as shown in FIG. 1, a rubber ring 15 is interposed between the outer peripheral surface of the first pipe 11 and the second pipe 12 and the inner peripheral surface of the housing 20. The first circumferential concave surface 33 and the second circumferential concave surface 34 formed in the portion 21 are positioned along the axial direction L of the first pipe 11 and the second pipe 12.

  Further, as shown in FIG. 2, the protruding portion 22 of each of the divided portions 21 protruding in the circumferential direction constitutes a printing structure with the receiving portion 23 of the adjacent divided portion 21, and this printing structure is a rubber ring 15. The rubber ring 15 is located on the both sides in the axial direction L of the first pipe 11 and the second pipe 12 and covers the rubber ring 15 from the outside.

  Next, the operation of the present embodiment having such a configuration will be described.

  First, a rubber ring 15 extending around the entire circumference is prepared, and this rubber ring 15 is disposed on one of the first pipe 11 and the second pipe 12 made of a large pipe, for example, the outer periphery of the first pipe 11. Next, the first pipe 11 and the second pipe 12 are joined to each other, and then the rubber ring 15 located on the outer periphery of the first pipe 11 is moved to the outer periphery of the joint portion 10A of the first pipe 11 and the second pipe 12.

  Next, the divided portion 21 of the housing 20 divided into four parts is disposed on the outer periphery of the joint portion 10A of the first pipe 11 and the second pipe 12 so as to surround the joint portion 10A and the rubber ring 15 from the outside.

  Thereafter, the four divided portions 21 are firmly fixed by tightening the bolt nuts 28 of the four fastening means 30, and the joint portion 10A and the rubber ring 15 are provided around the joint portion 10A of the first pipe 11 and the second pipe 12 The housing 20 which encloses from the outside is installed. This allows the pipe joint structure 10 to be assembled.

  When the bolt nut 28 of the fastening means 30 is tightened, the projection 22 of each divided portion 21 enters without abutting on the receiving portion 23 of the adjacent divided portion 21. Then, the first circumferential concave surface 33 formed on the inner circumferential surface of the divided portion 21 abuts on the abutment surface 11 B of the outer circumferential surface of the first pipe 11, and the second circumferential concave surface 34 is of the second piping 12. It abuts on the abutment surface 12B of the outer circumferential surface. Alternatively, the first circumferential projection 31 and the second circumferential projection 32 abut on the bottom of the first circumferential groove 11A and the bottom of the second circumferential groove 12A. At this stage, the tightening of the bolt and nut 28 of the fastening means 30 is stopped.

  Thus, the first circumferential concave surface 33 and the second circumferential concave surface 34 of each divided portion 21 are the contact surface 11B of the outer peripheral surface of the first pipe 11 and the contact surface 12B of the outer peripheral surface of the second pipe 12 The first circumferential projection 31 and the second circumferential projection 32 abut on the bottom of the first circumferential groove 11A and the bottom of the second circumferential groove 12A. For this reason, the gap between each divided portion 21 and the first pipe 11 and the second pipe 12 is fixed. By this, the rubber ring 15 can be pressed with uniform pressure between each divided portion 21 and the first pipe 11 and the second pipe 12, and the joint portion 10A of the first pipe 11 and the second pipe 12 There is no possibility of water leakage, and the water stop function can be kept constant at a predetermined level.

  In use, the support structure of the first pipe 11 and the second pipe 12 may have a problem, or the load from the fluid flowing through the first pipe 11 and the second pipe 12 may be caused by the weight of the first pipe 11 and the second pipe 12. Due to the motion, a shear force is applied to the first pipe 11 and the second pipe 12, and the shear force may deform the first pipe 11 and the second pipe 12 into a flat shape.

  In this case, as shown in FIG. 3, the first pipe 11 is deformed into a flat shape, and the outer edge in the vertical direction is contracted, and the outer edge in the lateral direction is expanded. Under the present circumstances, the protrusion part 22 of each division part 21 of the housing 20 has entered without contact | abutting in the receiving part 23 of the adjacent division part 21, and the 1st circumference formed in the inner skin of the division part 21 The concave surface 33 is in contact with the contact surface 11B of the outer peripheral surface of the first pipe 11, and the second circumferential concave surface 34 is in contact with the contact surface 12B of the outer peripheral surface of the second pipe 12, or a first circle The circumferential projection 31 and the second circumferential projection 32 abut on the bottom of the first circumferential groove 11A and the bottom of the second circumferential groove 12A. For this reason, each divided portion 21 can change its posture at the outer periphery of the joint portion 10A of the first pipe 11 and the second pipe 12.

  Specifically, the outer edge of the first pipe 11 shrinks in the vertical direction in FIG. 3 and the outer edge of the first pipe 11 expands in the horizontal direction, so each divided portion 21 also moves inward along the vertical direction of the first pipe 11 in FIG. And change its posture so as to move outward along the lateral direction of the first pipe 11. As a result, even if the first pipe 11 shrinks so that the outer edge shrinks in the vertical direction and the outer edge expands in the lateral direction, each divided portion 21 of the housing 20 conforms to the deformation of the first pipe 11 and its posture is flat Change. As a result, the inner edge of the housing 20 as a whole is contracted in the vertical direction and the inner edge is expanded in the lateral direction, so that the shape of the housing 20 can be similarly deformed into a flat shape following the flat deformation of the first pipe 11 it can.

  Although only the first pipe 11 of the first pipe 11 and the second pipe 12 is shown in FIG. 3 for the sake of convenience, the divided portion 21 of the housing 20 is similarly adapted to the flat deformation of the second pipe 12. Can change its attitude.

  From the above, the rubber ring 15 can be firmly pressed between the first pipe 11 and the second pipe 12 and the housing 20, and a drop in the water blocking function can be prevented.

  Furthermore, the first circumferential protrusion 31 and the second circumferential protrusion 32 are fitted in the first circumferential groove 11A of the first pipe 11 and the second circumferential groove 12A of the second pipe 12 in the divided portion 21 of the housing 20. The first circumferential concave surface 33 and the second circumferential concave surface 34 respectively abut the outer peripheral surface of the first pipe 11 and the outer peripheral surface of the second pipe 12 by tightening the fastening means 30 or The first circumferential protrusion 31 and the second circumferential protrusion 32 abut on the bottom of the first circumferential groove 11A and the bottom of the second circumferential groove 12A. As a result, even if the housing 20 is displaced in one radial direction with respect to the first pipe 11 and the second pipe 12, the first part 11 of each of the divided parts 21 of the housing 20 in the other radial direction It is possible to reliably prevent the first pipe 11 or the second pipe 12 from coming off in the axial direction.

  Next, another method of assembling the pipe joint structure will be described with reference to FIGS. 4 and 5.

  First, as shown in FIG. 4, when the outer edge of the first pipe 11 and the second pipe 12 is slightly larger than the reference, the first pipe 11 and the second pipe 12 made of large pipes are prepared and joined together. Although only the first pipe 11 is shown in FIG. 4 for the sake of convenience, the second pipe 12 is also similar to the first pipe 11. Next, the rubber ring 15 existing in the outer periphery of the first pipe 11 is moved to the outer periphery of the joint portion 10A of the first pipe 11 and the second pipe 12 in advance.

  Next, the divided portion 21 of the housing 20 divided into four parts is disposed on the outer periphery of the joint portion 10A of the first pipe 11 and the second pipe 12 so as to surround the joint portion 10A and the rubber ring 15 from the outside.

  Thereafter, the four divided portions 21 are firmly fixed by tightening the bolt nuts 28 of the four fastening means 30, and the joint portion 10A and the rubber ring 15 are provided around the joint portion 10A of the first pipe 11 and the second pipe 12 A housing 20 is provided which encloses from the outside, which allows the pipe joint structure 10 to be assembled.

  In this case, the tightening amount of the bolt and nut 28 is reduced as compared with the case of assembling the first pipe 11 and the second pipe 12 of the reference size. As a result, the housing 20 can be expanded radially outward and assembled to the outer edges of the first pipe 11 and the second pipe 12.

  Next, as shown in FIG. 5, when the outer diameter of the first pipe 11 and the second pipe 12 is slightly smaller than that of the reference, the first pipe 11 and the second pipe 12 made of large pipes are prepared and Join. Although only the first pipe 11 is shown in FIG. 5 for the sake of convenience, the second pipe 12 is also similar to the first pipe 11. Next, the rubber ring 15 existing on the outer periphery of the first pipe 11 is moved to the outer periphery of the joint portion 10 between the first pipe 11 and the second pipe 12 in advance.

  Next, the divided portion 21 of the housing 20 divided into four parts is disposed on the outer periphery of the joint portion 10A of the first pipe 11 and the second pipe 12 so as to surround the joint portion 10A and the rubber ring 15 from the outside.

  Thereafter, the four divided portions 21 are firmly fixed by tightening the bolt nuts 28 of the four fastening means 30, and the joint portion 10A and the rubber ring 15 are provided around the joint portion 10A of the first pipe 11 and the second pipe 12 A housing 20 is provided which encloses from the outside, which allows the pipe joint structure 10 to be assembled.

  In this case, the tightening amount of the bolt and nut 28 is increased as compared with the case of assembling the first pipe 11 and the second pipe 12 of the reference size. As a result, the housing 20 can be contracted radially inward and assembled to the outer edges of the first pipe 11 and the second pipe 12.

DESCRIPTION OF SYMBOLS 10 Piping joint structure 10A Joint part 11 1st piping 11A 1st circumferential groove 11B contact surface 12 2nd piping 12A 2nd circumferential groove 12B contact surface 15 rubber ring 20 housing 21 division part 22 projection part 23 reception part 25 Bolt pad 26 Bolt pad 28 Bolt nut 30 Fastening means 31 First circumferential projection 32 Second circumferential projection 33 First circumferential concave surface 34 Second circumferential concave surface

Claims (2)

The first pipe,
A second pipe joined to the first pipe;
A dividable housing that surrounds the joint between the first pipe and the second pipe from the outside;
A rubber ring interposed between the first pipe, the second pipe, and the housing;
The housing has a plurality of split parts and fastening means for fastening between the split parts,
Each divided portion is provided at both ends along the circumferential direction, and has a protruding portion protruding in the circumferential direction toward the adjacent divided portion, and a receiving portion for receiving the protruding portion of the adjacent divided portion, By tightening the fastening means, the projecting part of each parting part enters without abutting into the receiving part of the adjacent parting part,
First circumferential grooves and second circumferential grooves are respectively provided on the outer circumferential surface of the first pipe and the outer circumferential surface of the second pipe,
Each divided portion is provided with a first circumferential projection and a second circumferential projection to be fitted in the first circumferential groove and the second circumferential groove, and the first circumferential projection and the second circumferential projection are provided. A first circumferential concave surface and a second circumferential concave surface are formed inward in the axial direction of
By tightening the fastening means, the first circumferential protrusion and the second circumferential protrusion abut on the bottom of the first circumferential groove and the bottom of the second circumferential groove, or the first circumferential A pipe joint structure in which the concave surface and the second circumferential concave surface abut on an outer peripheral surface of the first pipe and an outer peripheral surface of the second pipe.   The piping joint according to claim 1, wherein the first circumferential concave surface and the second circumferential concave surface abut on the outer peripheral surface of the first pipe and the outer peripheral surface of the second pipe by tightening the fastening means. Construction.

Images