JP2015172407A - Expansion pipe device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expansion pipe device for preventing a buckling while keeping extensibility and flexibility.SOLUTION: An expansion pipe device comprises: bellows pipes 11 and 12; a connection pipe 13 interposed between the bellows pipes 11 and 12; a first cover 18 formed with a bellows and extended to one end part side of the bellows pipe 11 closest to the other end part side with the other end part side of the bellows pipe 11 as a fixed end on the outer side spaced from the bellows pipes 11 and 12; and a second cover 19 formed with a bellows and extended to the other end part side of the bellows pipe 12 closest to the one end part side with the one end part side of the bellows pipe 12 as a fixed end on the outer side spaced from the bellows pipes 11 and 12. The first cover 18 is formed with a first straight pipe part 18a at the leading end part of the one end part side, and the second cover 19 is formed with a second straight pipe part 19a at the leading end part of the other end part side. The first straight pipe part 18a and the second straight pipe part 19a are movably overlapped.

Description

  The present invention relates to a telescopic tube device capable of absorbing expansion / contraction due to a temperature change of a conduit, subsidence, earthquake, or the like.

  In a pipeline of a conduit for flowing a fluid such as a water pipe, a telescopic pipe device as in Patent Document 1 is used as a pipe joint for absorbing displacement due to temperature change, subsidence, earthquake, or the like. . The telescopic tube device of this Patent Document 1 has a stretchable bellows tube as a main component, and the bellows tube expands and contracts in the axial direction and / or curves in a direction perpendicular to the axial direction, thereby causing a pipe line It absorbs displacement caused by expansion and contraction due to temperature changes, land subsidence, earthquakes, etc.

  In addition, since the first and second covers are provided outside the bellows pipe, the telescopic pipe device of Patent Document 1 can protect the bellows pipe from external impacts and the like. Further, in the telescopic tube device of Patent Document 1, since the first and second covers are formed of bellows tubes, the inner bellows tube is bent and displaced in a direction perpendicular to the angular displacement or the axial direction. In some cases, it can follow and bend and be displaced.

  However, in the telescopic tube device of Patent Document 1, the bellows tube is used when the axial compression force is excessively applied, when the length / caliber ratio of the bellows is large, or when the number of peaks of the bellows tube is large. There is a problem that buckling occurs in a direction perpendicular to the axial direction, the flow cross-sectional area in the pipe is significantly reduced, and a necessary flow rate cannot be secured. On the other hand, in the telescopic tube device of Patent Document 1, if the number of bellows is simply reduced within a range that satisfies the required performance in order to reduce the risk of buckling, the pitch of the bellows is larger than before. Therefore, there is a problem that the plate becomes thick and difficult to bend.

Japanese Patent No. 4903497

  The present invention has been made in view of the above problems, and is capable of absorbing not only linear displacement in the axial direction but also angular displacement and displacement in a direction perpendicular to the axial direction. In addition, it aims at providing the expansion-contraction tube apparatus which can prevent buckling, maintaining a stretching property and flexibility.

  The telescopic tube device according to the present invention includes a bellows tube through which a fluid flows, a connecting tube attached between the bellows tube, a bellows, and the outermost end separated from the bellows tube. A first cover extending to the other end side of the bellows pipe, a bellows is formed on the outer side of the bellows pipe, A second cover extending toward one end of the bellows tube, with the other end of the bellows tube on the other end being a fixed end, and the first cover is provided on the other end side. A first straight pipe portion is formed at the distal end, and the second cover is formed with a second straight pipe portion at the distal end on one end side, and the first straight pipe portion and the second straight pipe portion are formed. The pipe part is overlapped so as to be movable.

  Further, the connecting pipe has a connecting pipe at each end, and the connecting pipe is provided with a guide member for guiding the first cover and / or the second cover. May be.

  Furthermore, the guide member may be provided on the outer peripheral surface of the connecting pipe rod or so that the outer peripheral surface of the guide member is flush with the outer peripheral surface of the connecting pipe rod.

  Further, the distal end portion of the first straight pipe portion of the first cover and / or the distal end portion of the second straight pipe portion of the second cover seems to be disposed on the outer peripheral surface of the guide member. Anyway.

  Furthermore, a first end tube attached to one end portion of the bellows pipe on the most end side, and a second end tube attached to the other end portion of the bellows pipe on the other end side, The first cover has one end fixed to the outer peripheral portion of the first end tube rod fixed to the first end tube, and the other end of the second cover is fixed to the second end tube. You may make it fix to the outer peripheral part of the fixed 2nd end pipe rod.

  According to the present invention, the expansion and contraction of the pipe line accompanying a temperature change or the like can be absorbed by the bellows pipe moving linearly in the axial direction. Furthermore, according to the present invention, the bellows tube is perpendicular to the axial direction together with the first cover and / or the second cover so that the angular displacement associated with the earthquake motion and the displacement in the direction perpendicular to the axial direction can be detected. It can be absorbed by being bent and displaced in any direction.

  In addition, according to the present invention, since the connecting pipe is attached between the bellows pipes, the number of bellows of the bellows pipe can be reduced as compared with the case where the bellows pipe is full. Therefore, according to the present invention, the bellows pipe is in a direction perpendicular to the axial direction as compared with the case where the bellows pipe is a full mountain while maintaining the same stretchability and flexibility as the case where the bellows pipe is a full mountain. Can be prevented from buckling.

It is the side view which showed the use condition of the expansion-contraction tube apparatus to which this invention is applied. It is side surface sectional drawing which showed the expansion-contraction tube apparatus to which this invention is applied. (A) is the side view which showed the expansion-contraction tube apparatus to which this invention is applied, (B) is a front view. (A) is front sectional drawing which showed the guide member provided on the outer peripheral surface of the connecting pipe rod while being formed in a ring shape, (B) is side sectional drawing. (A) is front sectional drawing which showed the guide member formed in plate shape, arrange | positioned radially, and was provided in the same plane, and was fixed to three members of a pair of connecting pipe rod and a connecting pipe. (B) is a side cross-sectional view. It is front sectional drawing which showed the guide member which was formed in plate shape, was arrange | positioned radially, was provided in the same plane, and was fixed between a pair of connecting pipe rods. It is front sectional drawing which showed the guide member which was formed in plate shape, is arrange | positioned radially, was provided non-planarly, and was fixed to three members of a pair of connecting pipe rod and a connecting pipe. It is front sectional drawing which showed the guide member which was formed in plate shape, was arrange | positioned radially, was provided non-planarly, and was fixed between a pair of connecting pipe rods. (A) is front sectional drawing which showed the guide member formed in plate shape, arrange | positioned concentrically, and was provided on the outer peripheral surface of a connecting pipe rod, (B) is side sectional drawing. . (A) is front sectional drawing which showed the guide member formed in plate shape, arrange | positioned concentrically, was provided in the same plane, and was fixed between a pair of connecting pipe rods, (B) FIG.

  Hereinafter, an expandable tube device to which the present invention is applied will be described in detail with reference to the drawings. In addition, this invention is not limited to the following examples, It can change arbitrarily in the range which does not deviate from the summary of this invention.

  As shown in FIG. 1, the telescopic pipe device 10 to which the present invention is applied includes, for example, a water bridge, a bridge, and an elevated bridge for the purpose of absorbing the expansion and contraction accompanying the temperature change of the pipe line, the displacement accompanying the ground subsidence, and the displacement accompanying the earthquake motion. It is used as a joint of an exposed water pipe 2 used for a structure 1 such as a water tank. The pipe of the water pipe 2 including the expansion / contraction tube device 10 is supported substantially linearly on the structure 1 by the support member 3 on both sides of the expansion / contraction tube device 10. Is supported by the support member 3 in a state in which expansion and contraction in the axial direction is allowed.

  In addition, although the steel pipe, the cast iron pipe, the synthetic resin pipe made from vinyl chloride, etc. are used as the water pipe 2, the telescopic pipe device 10 to which the present invention is applied can be connected to any kind of water pipe. is there.

  As shown in FIGS. 2 and 3, the telescopic tube device 10 to which the present invention is used as described above includes a first and a second bellows tube 11 having flexibility, stretchability, and sealing properties. 12, a connecting pipe 13 attached between the first bellows pipe 11 and the second bellows pipe 12, a first end pipe 14 integrally joined to one end of the first bellows pipe 11, And a second end tube 15 that is integrally joined to the other end of the second bellows tube 12.

  As shown in FIG. 2, the first bellows tube 11 is made of a metal material such as stainless steel having excellent mechanical properties and rust prevention properties, and the first bellows tube 11 A connecting portion 11b1 for connecting to the end tube 14 is integrally provided, and a connecting portion 11b2 for connecting to the connecting tube 13 is integrally provided at the other end of the bellows main body 11a. The first bellows tube 11 is formed so as to have a predetermined flexibility and stretchability by determining the plate thickness, the number of bellows, the height, and the like in consideration of the thickness, usage, and the like of the tube. . Moreover, the bellows main body 11a has sufficient strength to withstand the force caused by the internal pressure of tap water flowing inside. Each convex part 11c which comprises the bellows of the bellows main body 11a is formed in the cross-sectional inverted U shape where the front-end | tip raises substantially circular arc, for example. Each convex portion 11c is formed in an inverted U-shaped cross section, so that it is less likely to be crushed than when it is formed in a substantially Ω-shaped cross section, and the strength is increased. In addition, as long as necessary strength is obtained by the plate thickness or the like, each convex portion 11c may have a substantially Ω cross-sectional shape or other shapes.

  Moreover, the bottom part of the ditch | groove formed by each convex part 11c which comprises the bellows of the bellows main body 11a is formed so that it may not become smaller than the internal diameter of cylindrical connection part 11b1, 11b2. Thereby, the flow path of the 1st bellows pipe 11 does not become narrower than connection part 11b1, 11b2, and it can prevent that the flow of tap water is prevented in the part of bellows main part 11a.

  The first bellows tube 11 configured as described above is formed by, for example, compressing a raw tube formed of a stainless steel plate having a length approximately three times the length in the tube axis direction to form a bellows. In order to prevent stress cracking due to residual stress after the bellows is formed, a solution heat treatment is performed, and then the surface is subjected to acid cleaning to remove the residue after the heat treatment. Since the first bellows tube 11 is transformed from an elastic body to a plastic body by this heat treatment, no restoring force is generated as in the elastic body, and the bent shape is maintained when bent. Become. In addition, the manufacturing method of the 1st bellows pipe | tube 11 is not limited to the above example, For example, you may abbreviate | omit heat processing and an acid treatment.

  Note that the first bellows tube 11 is not limited to a stainless steel material, and for example, another appropriate metal such as copper, titanium, aluminum alloy, or a synthetic resin may be used. . Further, the first bellows tube 11 is configured by connecting a flexible conduit inside to prevent solid matter from staying inside and clogging due to the uneven structure of the bellows. Also good.

  As shown in FIG. 2, the second bellows tube 12 has the same configuration as that of the first bellows tube 11, and is made of a metal material such as stainless steel, and has the other end portion of the bellows body 12a having a substantially corrugated cross section. A connecting portion 12b1 for connecting to the second end tube 15 is integrally provided, and a connecting portion 12b2 for connecting to the connecting tube 13 is integrally provided at one end of the bellows body 12a. Further, the second bellows pipe 12 has the same configuration as that of the first bellows pipe 11, and the thickness, length, plate thickness, number of bellows, height, etc. of the pipe are also the first bellows pipe. 11 and is formed so as to have the same flexibility and stretchability as the first bellows tube 11. Since the second bellows tube 12 has the same configuration as the first bellows tube 11 as described above, a detailed description thereof is omitted here.

  The connecting pipe 13 is made of a metal material such as stainless steel, and is connected to a connecting portion 11b2 at the other end of the first bellows pipe 11 and one end of the second bellows pipe 12 as shown in FIG. The connecting portion 12b2 is connected to the connecting portion 12b2 and has an inner diameter substantially equal to the outer diameter of each of the connecting portions 11b2 and 12b2. Further, one end 13a of the connecting pipe 13 is fitted to the outer peripheral part of the connecting part 11b2 of the first bellows pipe 11, and the tip part of the connecting part 11b2 and the inner peripheral surface of the connecting pipe 13 are welded. Thus, the first bellows tube 11 is integrated with the first bellows tube 11 (a welding location is indicated by 30a in FIG. 2). Note that the first bellows tube 11 may be welded by the flange 20 integrated with the connecting tube 13 and the outermost convex portion 11d of the bellows. Further, the other end portion 13b of the connecting tube 13 is fitted to the outer peripheral portion of the connecting portion 12b2 of the second bellows tube 12, and the distal end portion of the connecting portion 12b2 and the inner peripheral surface of the connecting tube 13 are welded. Thus, it is integrated with the second bellows pipe 12 (in addition, a welding location is indicated by 30b in FIG. 2). Note that the second bellows tube 12 may be welded by the flange 21 integrated with the connecting tube 13 and the outermost convex portion 12d of the bellows.

  The first end tube 14 is made of a metal material such as stainless steel and is connected to the connection portion 11b1 at one end of the first bellows tube 11 as shown in FIG. It has an inner diameter approximately equal to the outer diameter. Further, the first end tube 14 has the other end portion 14b fitted into the outer peripheral portion of the connection portion 11b1 of the first bellows tube 11, and the distal end portion of the connection portion 11b1 and the inner peripheral surface of the first end tube 14. Are integrated with the first bellows pipe 11 (the welded portion is indicated by 30c in FIG. 2). Further, one end portion 14 a of the first end pipe 14 is joined to the end portion of the water pipe 2. Note that the first bellows tube 11 may be welded by the flange 16 integrated with the first end tube 14 and the outermost convex portion 11d of the bellows.

  Moreover, the one end part 14a of the 1st end pipe 14 and the end part of the water pipe 2 are the flange provided in the one end part 14a of the 1st end pipe 14, and the flange provided in the edge part of the water pipe 2, for example. The axes are matched and butt joined, and the butt flanges are connected by tightening with bolts and nuts. Of course, the mechanism for connecting the first end pipe 14 and the water pipe 2 is not limited to this, and other known mechanisms can also be used.

  The second end tube 15 is made of a metal material such as stainless steel, and is connected to the connection portion 12b1 at the other end of the second bellows tube 12 as shown in FIG. Has an inner diameter that is approximately equal to the outer diameter. Further, the second end tube 15 has one end portion 15a fitted to the outer peripheral portion of the connection portion 12b1 of the second bellows tube 12, and the distal end portion of the connection portion 12b1 and the inner peripheral surface of the second end tube 15. Are integrated with the second bellows pipe 12 (the welded portion is indicated by 30d in FIG. 2). Further, the other end 15 b of the second end pipe 15 is joined to the end of the water pipe 2. Note that the second bellows tube 12 may be welded by the flange 17 integrated with the second end tube 15 and the outermost convex portion 12d of the bellows.

  The other end 15b of the second end pipe 15 and the end of the water pipe 2 are, for example, a flange provided at the other end 15b of the second end pipe 15 and a flange provided at the end of the water pipe 2. Are connected to each other by tightening the abutted flanges with bolts and nuts. Of course, the mechanism for connecting the second end pipe 15 and the water pipe 2 is not limited to this, and other known mechanisms may be used.

  Further, as shown in FIG. 2, a ring-shaped first end tube rod 16 made of a metal material such as stainless steel is fitted to the other end portion 14b of the first end tube 14, as shown in FIG. Has been. Furthermore, the other end portion 14b of the first end tube 14 is integrated with the inner peripheral portion of the first end tube rod 16 by welding (a welding location is indicated by 30e in FIG. 2). In addition, you may weld with the outermost convex part 11d of the 1st bellows pipe | tube 11 using this welding location 30e. Furthermore, the first end tube rod 16 is provided higher than the outermost convex portion 11d in order to protect the end portion of the outermost convex portion 11d of the bellows main body 11a of the first bellows tube 11. And when the connection part 11b1 is fitted to the 1st end pipe 14, the 1st end pipe rod 16 is abutted from the outermost convex part 11d of the bellows main body 11a, and thereby the bellows main body 11a Protect the edges.

  Further, as shown in FIG. 2, a ring-shaped second end tube rod 17 made of a metal material such as stainless steel is fitted to the one end portion 15a of the second end tube 15 at the outer periphery. ing. Furthermore, the one end portion 15a of the second end tube 15 is integrated with the inner peripheral portion of the second end tube rod 17 by welding (a welding location is indicated by 30f in FIG. 2). In addition, you may weld with the outermost convex part 12d of the 2nd bellows pipe | tube 12 using this welding location 30f. Further, the second end tube rod 17 is provided higher than the outermost convex portion 12d in order to protect the end portion of the outermost convex portion 12d of the bellows body 12a of the second bellows tube 12. And when the connection part 12b1 is fitted by the 2nd end pipe 15, the 2nd end pipe rod 17 is abutted from the outer side by the outermost convex part 12d of the bellows main body 12a, and thereby the bellows main body 12a Protect the edges.

  Further, as shown in FIG. 2, a first cover 18 is attached to the outer peripheral portion of the first end tube rod 16, and a second cover 19 is attached to the outer peripheral portion of the second end tube rod 17. It is attached. The first and second covers 18 and 19 are made of a metal material such as stainless steel, and are bellows tubes having a substantially corrugated cross section. And the shape of the convex part of a bellows and the number of convex parts are determined by the performance (for example, intensity | strength and the ease of bending) of the 1st and 2nd covers 18 and 19. The first and second covers 18 and 19 are provided so as to have a slightly larger diameter than the first and second bellows pipes 11 and 12. Further, the first and second covers 18 and 19 are the sum total of the length of the bellows body 11a of the first bellows pipe 11, the length of the bellows body 12a of the second bellows pipe 12, and the length of the connection pipe 13. It is formed to be slightly longer than the length or half of the length between the first end tube rod 16 and the second end tube rod 17. And the 1st and 2nd covers 18 and 19 are integrated by welding to the outer peripheral part of the end pipe rods 16 and 17 (the welding location is shown by 30g and 30h in FIG. 2). .

  Unlike the bellows pipes 11 and 12, the first and second covers 18 and 19 do not receive any force due to the internal pressure of tap water, and do not need to ensure water tightness. , 17 only need to be fixed, and therefore, the connection between the bellows pipes 11, 12 and the end pipes 14, 15 is simple. The method of fixing the first and second covers 18 and 19 to the bellows pipes 11 and 12 is not limited to the fixing method using the end tube rods 16 and 17, and various fixing methods are used. Can do.

  Moreover, the front-end | tip part of the 1st and 2nd covers 18 and 19 is not formed with the bellows, but is the straight pipe parts 18a and 19a, and the straight pipe part 18a is the outside and the straight pipe part 19a is the inside. Are overlaid. The portion where the straight pipe portions 18a and 19a overlap ensures straightness when the bellows pipe 11 expands and contracts in the axial direction.

  Here, the overlapping length L of the straight pipe portions 18a and 19a is longer than the amount of expansion and contraction guaranteed by normal use of the bellows main bodies 11a and 12a. This is because when the bellows main bodies 11a and 12a extend linearly or when the bellows main bodies 11a and 12a are curved and the outer side extends, the straight pipe portions 18a and 19a are prevented from being overlapped. For example, when the first and second bellows pipes 11 and 12 as a whole have an expansion / contraction amount of ± 25 mm, the overlapping length L of the straight pipe portions 18a and 19a is longer than 25 mm, for example, 30 mm and 40 mm, When the expansion / contraction amount is ± 50 mm, the length L in which the straight pipe portions 18a and 19a overlap is longer than 50 mm, for example, 60 mm and 70 mm.

  The first and second covers 18 and 19 as described above are exposed pipes and protect the bellows pipe 11 from external impacts and the like, and the overlapping straight pipe portions 18a and 19a move to each other to form a bellows pipe. 11 has a function of ensuring straightness when expanding and contracting in the axial direction. Further, the first and second covers 18 and 19 are constituted by bellows pipes, so that the internal bellows pipes 11 and 12 are bent, that is, when they are displaced in a direction perpendicular to the angular displacement or the axial direction. Is displaced following this.

  The first and second covers 18 and 19 can be manufactured in the same manner as the bellows pipes 11 and 12, but the quality of the bellows pipes 11 and 12 is not required. Sometimes heat treatment for removing stress and acid treatment for removing residue may be omitted.

  The first and second covers 18 and 19 may be made of other appropriate metals such as copper, titanium, aluminum alloy, or synthetic resin, similar to the bellows tubes 11 and 12. .

  Further, as shown in FIG. 2, a ring-shaped connecting pipe rod 20 made of a metal material such as stainless steel is fitted to one end portion 13 a of the connecting pipe 13 as shown in FIG. 2. And the one end part 13a of the connection pipe 13 is integrated with the inner peripheral part of the connection pipe rod 20 by welding (a welding location is shown by 30i in FIG. 2). In addition, you may weld with the outermost convex part 11d of the 1st bellows pipe | tube 11 using this welding location 30i. Furthermore, the connecting pipe rod 20 is provided higher than the outermost convex part 11d in order to protect the end part of the outermost convex part 11d of the bellows body 11a of the first bellows pipe 11. And when the connection part 11b2 is fitted by the connection pipe 13, the connection pipe rod 20 is abutted from the outer side by the outermost convex part 11d of the bellows main body 11a, thereby protecting the end of the bellows main body 11a.

  Further, as shown in FIG. 2, a ring-shaped connecting pipe rod 21 made of a metal material such as a stainless material is fitted to the other end 13 b of the connecting pipe 13 on the outer periphery. And the other end part 13b of the connecting pipe 13 is integrated with the inner peripheral part of the connecting pipe rod 21 by welding (the welding location is indicated by 30j in FIG. 2). In addition, you may weld with the outermost convex part 12d of the 2nd bellows pipe | tube 12 using this welding location 30j. Further, the connecting pipe rod 21 is provided higher than the outermost convex part 12d in order to protect the end of the outermost convex part 12d of the bellows body 12a of the second bellows pipe 12. And when the connection part 12b2 is fitted to the connection pipe 13, the connection pipe rod 21 protects the end part of the bellows main body 12a by being abutted against the outermost convex part 12d of the bellows main body 12a.

  Further, as shown in FIG. 4, guide members 22 are attached to the outer peripheral portions of the connecting pipe rods 20 and 21. The guide member 22 is made of a metal material such as a stainless material and is formed in a ring shape. Furthermore, the guide member 22 has one end portion 22a integrated with the outer peripheral portion of the connecting pipe rod 20 by welding, and the other end portion 22b integrated with the outer peripheral portion of the connecting pipe rod 21 by welding (the welding location is This is indicated by 30k in FIG. In addition, the fixing method to the connecting pipe rods 20 and 21 of the guide member 22 can use various fixing methods other than welding. Further, as shown in FIG. 2, the guide member 22 has the straight pipe portions 18a, 19a of the first and second covers 18, 19 before the distal ends of the first and second covers 18, 19 are displaced. In addition to the initial stage, it is preferable that the first and second covers 18 and 19 are provided so as to be arranged on the outer peripheral surface even when the first and second covers 18 and 19 are maximally shrunk.

  Since the guide member 22 as described above is provided on the outer peripheral portion of the connecting pipe rods 20 and 21, the first and second covers 18 and 19 are displaced as the bellows pipes 11 and 12 are displaced. When the front end portions of the straight pipe portions 18a and 19a move, the front end portions of the straight pipe portions 18a and 19a are prevented from being caught by the connecting pipe rods 20 and 21 and the bellows pipes 11 and 12, and the straight pipe portions 18a and 19a are prevented. Guides to move smoothly.

  The guide member 22 is not limited to be provided on the outer peripheral portion of the connecting pipe rods 20, 21, but between the connecting pipe rod 20 and the connecting pipe rod 21 and the outer peripheral portion of the guide member 22. You may make it provide so that the outer peripheral part of the connecting pipe rods 20 and 21 may become flush.

  Further, the guide member 22 is not limited to being formed in a ring shape as shown in FIG. 4, and may be formed in a plate shape as shown in FIGS. 5 to 10. .

  Furthermore, as shown in FIGS. 5 to 8, at least one guide member 22 formed in a plate shape may be provided radially from the center of the tube. At this time, the guide member 22 is preferably provided so that the outer peripheral portion of the guide member 22 is flush with the outer peripheral portions of the connecting pipe rods 20 and 21, as shown in FIGS. And as shown in FIG. 8, you may make it provide so that the outer peripheral part of the guide member 22 may become lower than the outer peripheral part of the connecting pipe rods 20 and 21, for example. Further, when the guide members 22 are provided flush with each other, the guide member 22 is provided with the same length as the connecting pipe rods 20 and 21 as shown in FIG. As shown in FIG. 6, it is provided shorter than the connecting pipe rods 20 and 21, and is fixed to only two members of the connecting pipe rod 20 and the connecting tube rod 21, as shown in FIG. May be. Further, in the case of being provided non-uniformly, the guide member 22 is provided shorter than the connecting pipe rods 20 and 21 as shown in FIG. Alternatively, it may be fixed to only two members of the connecting pipe rods 20 and 21 as shown in FIG.

  Further, as shown in FIGS. 9 and 10, at least one guide member 22 may be provided concentrically with the connection pipe 13. At this time, the guide member 22 may be provided on the outer peripheral portion of the connecting pipe rods 20, 21 as shown in FIG. 9, and the outer peripheral portion of the guide member 22 is connected to the connecting pipe as shown in FIG. You may make it provide so that the outer peripheral part of the collars 20 and 21 may become flush | level.

  As shown in FIG. 1, the telescopic pipe device 10 configured as described above is used as a joint of an exposed water pipe 2 used in a structure 1 such as a water bridge, a bridge, and an elevated water tank. That is, in the telescopic pipe device 10, the end pipes 14 and 15 are watertightly connected to the end of the water pipe 2 whose vicinity of the connection end is supported by the support member 3 of the structure 1 by a flange joint or the like. Under normal circumstances, for example, the pipe line of the water pipe 2 expands and contracts due to a temperature change. , 19a are absorbed by expanding and contracting in the axial direction while guiding straightness at the overlapping portion.

  Furthermore, when a land subsidence or earthquake occurs, the bellows pipes 11 and 12 may be displaced in the direction perpendicular to the axis of the bellows pipes 11 and 12 as the water pipe 2 is displaced. Also in this case, the telescopic tube device 10 follows the displacement of the first and / or second bellows 11, 12 because the first and / or second covers 18, 19 have bellows. The displacement of the water pipe 2 can be absorbed.

  Furthermore, since the connecting pipe 13 is attached between the first bellows pipe 11 and the second bellows pipe 12 in the telescopic pipe device 10, the number of bellows of the first bellows pipe 11 and the second The total number of bellows peaks of the bellows tube 12 and the number of bellows peaks can be reduced as compared with the case where the bellows tube is a whole mountain. Therefore, the telescopic tube device 10 maintains the same stretchability and flexibility as the case where the bellows tube is the entire mountain, and the bellows tubes 11 and 12 with respect to the axial direction than the case where the bellows tube is the entire mountain. It is possible to prevent buckling in a perpendicular direction.

  Furthermore, since the telescopic tube device 10 is provided with the guide member 22 in the connecting pipe rods 20 and 21, when the first and second covers 18 and 19 move in accordance with the displacement of the bellows tubes 11 and 12. The straight pipe portions 18a and 19a can be prevented from being caught by the connecting pipe rods 20 and 21 and the bellows pipes 11 and 12, and the straight pipe portions 18a and 19a can be moved smoothly.

  The telescopic tube device 10 may omit the guide member 22 without providing the guide member 22. Even in such a case, since the expansion tube device 10 is provided with the connecting pipe rods 20 and 21 higher than the outermost convex portions 11d and 12d of the bellows bodies 11a and 12a of the bellows tubes 11 and 12, When the first and second covers 18 and 19 move, the straight pipe portions 18a and 19a can be guided so as to move smoothly.

  Further, in the telescopic tube device 10, the first and second covers 18 and 19 are maximally shrunk in addition to the initial ends of the straight pipe portions 18 a and 19 a of the first and second covers 18 and 19. However, it is not limited to be provided on the outer peripheral surface of the guide member 22, and the outer periphery is not located at any position in the movement range of the distal end portions of the straight pipe portions 18 a and 19 a. You may provide so that it may arrange | position on a surface.

  Further, the telescopic tube device 10 is provided with different lengths of the bellows tubes 11, 12, and the guide member 22 (connection tube 13) is at one end side or the other side from the approximately central portion in the length direction of the telescopic tube device 10. The guide member 22 (connecting tube 13) may be disposed at a position other than the approximately central portion in the length direction of the telescopic tube device 10, such as disposed at the end side position.

  Further, the telescopic tube device 10 may have two or more connecting tubes 13. For example, when it has a 1st connecting pipe and a 2nd connecting pipe, a 1st connecting pipe is attached between the 1st bellows pipe and the 2nd bellows pipe, and the 2nd bellows pipe and the 3rd A second connecting pipe is attached to the first bellows pipe, and a first cover is fixed to the first end pipe of the first end of the first bellows pipe closest to the one end, and the second end of the first bellows pipe is The second cover may be fixed to the second end tube at the other end of the third bellows tube. In addition, you may fix so that the same effect may be acquired with another method and position.

  Further, the telescopic tube device 10 includes a connecting tube 13, a first end tube 14, a second end tube 15, a first end tube rod 16, a second end tube rod 17, a first cover 18, and a second cover tube 13. The cover 19, the connecting pipe rod 20, the connecting pipe rod 21, and the guide member 22 are not limited to being formed of a stainless steel material. For example, other appropriate metals such as copper, titanium, aluminum alloy, Or you may make it form with a synthetic resin.

  Furthermore, the telescopic tube device 10 is not limited to being used as a joint of the exposed water pipe 2, but may be used as an embedded type.

  The telescopic pipe device 10 can also be applied to plumbing of middle water conduits and sewage pipes, and is a fluid made of a gas such as city gas or cooling gas, or a solid such as a powder, granule or gel. It can also be applied to the piping work of the conduit through which the water flows.

DESCRIPTION OF SYMBOLS 1 Structure, 2 water pipe, 3 support member, 10 expansion-pipe apparatus, 11 1st bellows pipe, 11a bellows main body, 11b1 connection part, 11b2 connection part, 11c convex part, 11d outermost convex part, 12 2nd Bellows tube, 12a Bellows body, 12b1 connection portion, 12b2 connection portion, 12d outermost convex portion, 13 connection tube, 13a one end portion, 13b other end portion, 14 first end tube, 14a one end portion, 14b other end portion, 15 Second end tube, 15a One end, 15b Other end, 16 First end tube rod, 17 Second end tube rod, 18 First cover, 18a Straight tube portion, 19 Second cover, 19a Straight pipe part, 20 connecting pipe rod, 21 connecting pipe rod, 22 guide member, 22a one end, 22b other end

Claims (5)

A bellows tube through which fluid flows,
A connecting pipe attached between the bellows pipe,
A first cover formed with a bellows and extending outside the bellows pipe, with the one end of the bellows pipe closest to the one end being a fixed end and extending to the other end of the bellows pipe When,
A second bellows is formed on the outer side spaced apart from the bellows pipe and extending to one end of the bellows pipe with the other end of the bellows pipe on the other end being a fixed end. With a cover,
The first cover is formed with a first straight pipe portion at a tip portion on the other end side,
The second cover has a second straight pipe portion formed at a tip portion on one end side,
The telescopic tube device, wherein the first straight pipe portion and the second straight pipe portion are movably overlapped with each other. The connecting pipe has a connecting pipe rod at each end,
2. The telescopic tube device according to claim 1, wherein a guide member for guiding the first cover and / or the second cover is provided on the connection pipe rod.   The said guide member is provided so that the outer peripheral surface of the said connecting pipe rod or the outer peripheral surface of this guide member may become the same as the outer peripheral surface of the said connecting tube rod. Telescopic tube device.   The distal end portion of the first straight pipe portion of the first cover and / or the distal end portion of the second straight pipe portion of the second cover are disposed on the outer peripheral surface of the guide member. The telescopic tube device according to claim 2 or 3. A first end tube attached to one end of the bellows tube on the most end side;
A second end pipe attached to the other end of the bellows pipe on the most other end side;
The first cover is fixed to an outer peripheral portion of a first end tube rod whose one end is fixed to the first end tube,
5. The second cover according to claim 1, wherein the other end of the second cover is fixed to an outer peripheral portion of a second end tube rod fixed to the second end tube. Telescopic tube device.

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