JP2019105324A - Corrugated tube, composite tube, composite tube assembly and method for constructing composite tube - Google Patents

Abstract

To improve construction quality when laying a corrugated tube or composite tube using a saddle for fixing piping.SOLUTION: A corrugated tube 20 is made into a tubular shape and a bellows-like shape such that an annular crest part 22 projecting on an outside in a radial direction and an annular trough part 24 recessed on the outside in the radial direction are alternately formed in an axial direction, and formed with a small diameter part 26 recessed on the outside in the radial direction and having a width wider than the trough part 24 at a predetermined pitch P in the axial direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a corrugated pipe, a composite pipe, a composite pipe assembly, and a method of installing the composite pipe.

  The composite pipe which covered the outer peripheral surface of the tube body by the flexible protective layer which formed the unevenness | corrugation in the inner peripheral surface is disclosed (refer patent document 1). By forming the unevenness on the inner peripheral surface of the protective layer, the contact area on the inner side of the protective layer with respect to the outer periphery of the tubular body is reduced, thereby reducing the frictional resistance. Thereby, the end of the protective layer is pushed close to the axial direction of the tube to improve the efficiency of the work of exposing the connection end of the tube.

JP, 2013-231490, A

  However, in the above-described conventional example, the pipe laying operation is not particularly considered. At the time of construction of laying pipes such as the above-described composite pipe at a laying location, a saddle for pipe fixing is used. This saddle needs to be arranged at a predetermined pitch with respect to the piping, and conventionally, the saddle was attached to the piping while the pitch was measured by visual observation or scale. For this reason, the pitch of the saddle was uneven.

  An object of this invention is to improve the construction quality at the time of laying a corrugated pipe and a composite pipe using the saddle for piping fixation.

  The corrugated pipe according to the first aspect has a tubular shape, and an annular peak that is convex outward in the radial direction and an annular valley that is concave in the outer radial direction are alternately formed in the axial direction to form a bellows. The radially outer side is concave, and a small diameter portion wider than the valley portion is formed at a predetermined pitch in the axial direction.

  In this corrugated pipe, since the small diameter portion wider than the valley portion is formed at a predetermined pitch in the axial direction, by attaching a saddle for fixing the pipe to the small diameter portion, the saddle at the time of laying the corrugated pipe It is possible to suppress the variation of the pitch and improve the construction quality. In addition, since the measurement of the pitch of the saddle becomes unnecessary, the installation becomes easy. Since the saddle is attached to the small diameter portion, the protrusion of the saddle from the corrugated pipe is suppressed, so the space required for the piping can be reduced and the appearance becomes good.

  According to a second aspect of the present invention, there is provided a composite pipe according to a second aspect, the corrugated pipe according to the first aspect capable of being shortened in the axial direction at the peak and the valley, a pipe disposed inside the corrugated pipe, and the pipe And an intermediate layer disposed between the body and the corrugated tube.

  In this composite tube, the tube is disposed inside the bellows-like corrugated tube. The corrugated pipe can be axially shortened at the peaks and valleys. Therefore, when a force is applied to the corrugated pipe in a direction to shorten the corrugated pipe in the axial direction, the peak portions are deformed so as to expand radially outward first, and then adjacent peak portions are The inflection in the peaks and valleys is deformed so as to approach. Thus, the corrugated corrugated tube can be easily deformed to expose the end of the tube. In addition, even if there are slight variations in the bending angle and thickness of the corrugated pipe, it is possible to suppress that the valleys bulge outward in the radial direction, and adjacent peaks do not approach each other and become a distorted deformation state. It is possible to suppress the reduction in the appearance of the shortened corrugated pipe.

  In addition, since the intermediate layer is provided between the pipe body and the corrugated pipe, it is possible to suppress adhesion between the outer circumference of the pipe body and the inner circumference of the corrugated pipe and the relative movement thereof becoming difficult. Moreover, it can prevent that the molten resin used as a corrugated pipe at the time of manufacture contacts and fuse | melts with a pipe body, and becomes difficult to move relatively.

  A composite pipe assembly according to a third aspect includes the composite pipe according to the second aspect, and a saddle for pipe fixing attached to the small diameter portion of the corrugated pipe in the composite pipe.

  In this composite pipe assembly, since the saddle is attached to the composite pipe in advance, the work of attaching the saddle to the composite pipe at the construction site becomes unnecessary. Therefore, the composite pipe assembly can be laid easily and in a short time.

  According to a fourth aspect, in the composite pipe assembly according to the third aspect, a pipe joint is connected to an end portion of the pipe body exposed by shortening and deforming the corrugated pipe and the intermediate layer in the axial direction. There is.

  In this composite pipe assembly, since the pipe joint is connected in advance to the end of the pipe body, the work of connecting the pipe joint to the end of the pipe body at the construction site becomes unnecessary, and the number of steps is reduced. For this reason, the composite pipe assembly to which the pipe joint is connected can be installed easily and in a short time.

  According to a fifth aspect of the present invention, there is provided a method of constructing a composite pipe, wherein an annular peak portion which is convex in the radially outer side and an annular valley portion which is concave in the radial outer side are alternately formed in the axial direction The bellows is corrugated and the outer diameter side is concave, and a small diameter portion wider than the valley portion is formed at a predetermined pitch in the axial direction, and the corrugated portion can be shortened in the axial direction with the peak portion and the valley portion A tube, a tube disposed inside the corrugated tube, and an intermediate layer disposed between the tube and the corrugated tube and sandwiched between the valley and the tube With respect to the composite pipe, a saddle for fixing the pipe is attached to the small diameter portion in advance, and the saddle is fixed to a laying position to lay the composite pipe.

  In this construction method of the composite pipe, a saddle for fixing the pipe is attached in advance to the small diameter portion of the corrugated pipe in the composite pipe, and the saddle is fixed to the installation location to lay the composite pipe. It is possible to suppress the variation of the pitch of the saddle and to improve the construction quality. In addition, since installation of a saddle and measurement of a pitch of a saddle become unnecessary at the time of laying, construction becomes easy.

  According to a sixth aspect, in the method of installing a composite pipe according to the fifth aspect, the corrugated pipe and the intermediate layer are axially shortened to deform the corrugated pipe and the intermediate layer to expose the end of the pipe body. With the joint connected, the composite pipe and the pipe joint are disposed at the installation point.

  In this construction method of the composite pipe, the composite pipe and the pipe joint are disposed at the installation site while the pipe joint is further connected to the end of the pipe body, so the pipe joint is connected to the end of the pipe body at the construction site Work is no longer required and man-hours are reduced. Therefore, the composite pipe and the pipe joint can be laid easily and in a short time.

  According to the corrugated pipe, the compound pipe, the method of assembling the compound pipe, and the method of installing the compound pipe according to the present invention, the construction for laying the corrugated pipe or the compound pipe can be facilitated using the saddle for fixing the pipe. .

It is a half section view showing a compound pipe concerning a 1st embodiment. It is an expansion half sectional view of FIG. It is an expanded sectional view of FIG. It is a half section view showing a state where the corrugated tube and the intermediate layer are shortened and deformed to expose the end of the tube. It is an expanded sectional view which shows the shortening deformation | transformation state of a corrugated pipe and an intermediate | middle layer. It is an expanded sectional view of FIG. 4 which shows the shortening deformation | transformation state of a corrugated pipe and an intermediate | middle layer. It is a perspective view showing a compound pipe which exposed an end of a tube, and a tube fitting connected to a tube. It is a perspective view which shows the state which attaches a saddle to a composite pipe. FIG. 5 is a half sectional view showing a composite pipe assembly having a saddle attached to the composite pipe. It is a perspective view which shows the process of the construction which lays a composite pipe assembly in which a saddle is attached to a composite pipe and a pipe joint is connected to the end of a pipe body in an installation place. It is an expanded sectional view showing a compound pipe concerning a 2nd embodiment. It is a half section view showing a state where the corrugated tube and the intermediate layer are shortened and deformed to expose the end of the tube.

Hereinafter, a mode for carrying out the present invention will be described based on the drawings. This will be described in detail with reference to the drawings as appropriate. Constituent elements indicated with the same reference numerals in the respective drawings mean identical constituent elements or substantially identical constituent elements, and redundant description in the embodiments will be omitted.
The present invention is not limited to the following embodiments, and can be appropriately changed without departing from the scope of the present invention.
Here, in the description of the embodiment, a numerical range represented by using a symbol “to” means a range including numerical values described before and after the symbol “to” as a lower limit value and an upper limit value.
In addition, "process" is used not only for an independent process but also for "part of a process" that can not be clearly distinguished from other processes but can achieve the same function.
Further, the amount of each component in the composition means the total amount of the plurality of substances present in the composition unless a plurality of substances corresponding to each component are present in the composition. Do.
Furthermore, "main component" means a component having the highest content by mass in the mixture, unless otherwise specified.

First Embodiment
In FIGS. 1 to 3, a composite pipe 10 according to the present embodiment includes a pipe body 12, a corrugated pipe 20 as a covering layer, and an intermediate layer 14.

(1) Configuration of Tube 12 The tube 12 is a cylindrical tube and is a resin tube formed using a resin material. The tube 12 is disposed inside the corrugated tube 20. Examples of the resin as the resin material include polyolefins such as polybutene, polyethylene, crosslinked polyethylene, and polypropylene, and vinyl chloride. The resin may be used alone or in combination of two or more. Among the resins, polybutene is suitably used, and it is preferable to contain polybutene as a main component. For example, it is more preferable to contain 85 mass% or more of polybutene in the resin material which comprises the tubular body 12. Moreover, the resin material which comprises the tubular body 12 may contain other additives.

  The outer diameter of the tubular body 12 is not particularly limited, but is set, for example, in the range of 10 mm to 100 mm. The most preferred outer diameter of the tube 12 is in the range of 12 mm to 35 mm.

  Moreover, the thickness of the tubular body 12 is not particularly limited, but is set to, for example, 1.0 mm to 5.0 mm. The most preferred thickness of the tube 12 is in the range of 1.4 mm to 3.2 mm.

(2) Configuration of Corrugated Pipe 20 The corrugated pipe 20 has a cylindrical tubular shape which is slightly larger than the outer diameter of the pipe 12 and is disposed with the intermediate layer 14 interposed in the pipe 12. The corrugated pipe 20 is a resin pipe formed using a resin material. Examples of the resin as the resin material include polyolefins such as polybutene, polyethylene, polypropylene, and crosslinked polyethylene, and vinyl chloride. The resin may be used alone or in combination of two or more. Among the resins, low density polyethylene is suitably used, and it is preferable to contain low density polyethylene as a main component. For example, in the resin material which comprises the corrugated pipe 20, it is more preferable to contain 80 mass% or more of low density polyethylene, and it is still more preferable to contain 90 mass% or more.

  Moreover, it is preferable to set MFR (Melt Flow Rate) of resin used for the corrugated pipe | tube 20 to 0.25 or more, and it is more preferable to set to 0.3 or more. More preferably, the MFR is set in the range of 0.35 to 1.2. When the MFR is set to 0.25 or more, the resin of the corrugated pipe 20 can easily enter the intermediate layer 14, and the adhesion between the corrugated pipe 20 (especially the valley portion 24 described later) and the intermediate layer 14 can be enhanced. .

  Moreover, when MFR is set to 1.2 or less, it becomes difficult to generate | occur | produce a burr | flash at the time of shaping | molding of the corrugated pipe | tube 20. FIG. In addition, in the resin material which comprises the corrugated pipe 20, the other additive may be contained.

  The corrugated pipe 20 alternately has an annular peak 22 that is convex outward in the radial direction R and an annular valley 24 that is concave in the outer side in the radial direction R along the axial direction S of the tube 12. It is formed continuously. That is, the corrugated pipe 20 is formed in a bellows shape and can be axially shortened. The ridges 22 are arranged outside the valleys 24 in the radial direction R.

  Further, as shown in FIGS. 1 and 2, the corrugated tube 20 is formed with a small diameter portion 26 which is concave on the radially outer side and wider than the valley portion 24 at a predetermined pitch P in the axial direction. . The pitch P of the small diameter portion 26 is set to, for example, 50 cm in consideration of the construction standard and the ease of construction. The small diameter portion 26 is formed in a cylindrical shape in a radial cross section, and is formed flat in an axial cross section. The width W1 of the small diameter portion 26 is set to be equal to or larger than the width W2 (FIG. 9) of the saddle 32 used to fix the composite pipe 10.

  The small diameter portion 26 is not limited to a cylindrical shape in a radial direction cross section, and may be formed in a square tube shape or a combination of a curved surface portion and a flat surface portion. Further, the pitch P of the small diameter portion 26 is not limited to 50 cm, and may be set to another dimension.

  The sectional structure of the corrugated tube 20 will be described in detail with reference to FIG. The outermost part of the corrugated radial direction R of the corrugated tube 20 is an outer wall (top wall) 22A, and the innermost part of the radial direction R is an inner wall 24A. The outer side of the radial direction R is a peak 22 and the inner side of the radial direction R is a valley 24 with the middle portion M between the outer wall 22A and the inner wall 24A in the radial direction R as a boundary.

  The ridges 22 are a pair of an outer wall 22A extending in the axial direction S (see FIG. 2) and a pair extending inward in the radial direction R from both ends in the axial direction S of the outer wall 22A. And a side wall 22B. Between the outer side wall 22A and the side wall 22B, there is formed an arc-shaped outer bent portion 22C which protrudes outward in the radial direction R.

  The valley portion 24 includes an inner side wall 24A extended along the axial direction S (see FIG. 2), and a pair of side walls 24B extended outward in the radial direction R from both ends of the inner side wall 24A. Have. Between the inner side wall 24A and the side wall 24B, an arc-like inward bent portion 24C which protrudes inward in the radial direction R is formed.

  Inside the radial direction R of the ridge 22 of the corrugated pipe 20, a concave mountain space 23 is formed by surrounding the outer side of the radial direction R and one and the other of the axial directions S by the outer wall 22A and the pair of side walls 22B. It is formed. A part of the outside in the radial direction R of the intermediate layer 14 is engaged with the mountain space 23.

The length L1 of the ridge portion 22 in the axial direction S is set longer than the length L2 of the valley portion 24 in the axial direction S. The length L1 is preferably 1.2 times or more of the length L2 in order to ensure the deformability of the outer wall 22A at the time of the shortening deformation described later. The length L2 is preferably 0.8 mm or more. This is because if the length L2 is less than 0.8 mm, the width of the valley of the mold for producing the covering layer 16 is too small, and the resin constituting the covering layer 16 is extruded at the time of producing the covering layer 16 When the resin is made uneven with the mold, the portion of the resin corresponding to the valley of the mold becomes thin and fragile, which makes it difficult to form the covering layer 16. On the other hand, the length L1 is preferably 5 times or less of the length L2. This is because the flexibility of the composite tube 10 can be maintained by setting the length L1 to 5 times or less of the length L2. Moreover, when the length L1 is too long, when laying the composite pipe 10, the contact area with the ground becomes large and it becomes difficult to construct.
As shown in FIG. 3, the length L1 is the distance between the outer sides in the axial direction S of the surface of the covering layer 16 as viewed from the outside in the radial direction R at a portion intersecting the boundary A2 in the covering layer 16 This is the distance between the surface in the axial direction S on one side of the portion convex outward in the radial direction R of the layer 16 and the surface on the other side in the axial direction S). Further, the length L2 is the distance between the axial direction S outside in the surface viewed from the inside of the radial direction R of the covering layer 16 in the portion intersecting the boundary A2 in the covering layer 16 (the inside of the radial direction R of the covering layer 16 The distance between the surface on one side in the axial direction S of the portion to be convex and the surface on the other side in the axial direction S).

  The thinnest part of the thickness of the corrugated tube 20 is set to 0.1 mm or more, and the thickest part is set to 0.4 mm or less. When the thickness is set to such a thickness, the end portion of the corrugated tube 20 is easily brought into contact along the axial direction S to be easily shortened and deformed.

  The thickness H1 of the outer side wall 22A is set to be thinner than the thickness H2 of the inner side wall 24A, and is set to not more than 0.9 times the thickness H2 here. When set to such a thickness, the outer wall 22A is more easily deformed than the inner wall 24A, so that the end of the corrugated pipe 20 is easily pushed along the axial direction S to be shortened and deformed.

  The difference in radius ΔR between the outer surface in the radial direction R of the ridges 22 and the outer surface in the same direction of the valleys 24 is set to 800% or less of the average thickness of the corrugated tube 20. If the radius difference ΔR is too large, the portion (outer wall 22A) along the axial direction S of the ridge 22 is difficult to deform during shortening and deformation, and additionally, the valley 24 bulges outward in the radial direction R The adjacent mountain portions 22 do not come close to each other, so that they are likely to be in a distorted deformation state. In the case where the radius difference ΔR is set to 800% or less of the average of the thickness of the corrugated tube 20, the length in the axial direction S of the ridge 22 is set longer than the length in the axial direction S of the valley 24 Thus, the deformation state can be effectively suppressed. The setting of the length in the axial direction S of the ridge portion 22 is effective when the radius difference ΔR is set to 600% or less.

  Although the diameter (outer diameter of the outermost part) of the corrugated pipe 20 is not particularly limited, it is set, for example, in the range of 13 mm to 130 mm.

(3) Configuration of Intermediate Layer 14 The intermediate layer 14 is in the form of a sheet, and is disposed between the tubular body 12 and the corrugated tube 20. The inner circumferential surface of the intermediate layer 14 is flat and covers the outer periphery of the tube 12 while being in full contact with the outer periphery of the tube 12. Here, “entirely in contact” does not mean that all parts need to be in intimate contact, but means that the entire surface is substantially in contact. Accordingly, the case where the joint portion of the sheet-like intermediate layer 14 is partially separated or the portion which is wrinkled between the tubular body 12 and the corrugated pipe 20 is partially separated is included.

  Resins as the intermediate layer 14 include, for example, polyurethane, polystyrene, polyethylene, polypropylene, and ethylene propylene diene rubber, and mixtures of these resins. Among the resins, polyurethane is preferred. The intermediate layer 14 is preferably a layer containing polyurethane as a main component (that is, a porous urethane layer). For example, it is preferable to contain 80 mass% or more of polyurethane in the component of the intermediate | middle layer 14, and it is more preferable to contain 90 mass% or more. The porous resin layer as the intermediate layer 14 may contain other additives.

  The abundance ratio of pores in the mid layer 14 (for example, the foaming ratio in the case of a foam) can be measured using the method described in Appendix 1 of JIS-K6400-1 (2012). Here, the abundance ratio is preferably 25/25 mm or more, and more preferably 45/25 mm or less. The mid layer 14 is preferably a foam.

The density of the porous resin layer as the intermediate layer 14 is set in a range of ^{12kg / m 3 ~22kg / m 3} .

  In the composite pipe 10, when the pipe joint 28 and the like are connected to the end of the inner pipe 12, the end of the corrugated pipe 20 is shortened and displaced along the axial direction S, and the end of the pipe 12 is Exposed. At this time, the displacement of the intermediate layer 14 in the axial direction S does not follow the shortened deformed corrugated tube 20, and the intermediate layer 14 is left on the outer surface of the tube 12 and the end of the tube 12 is sufficiently It may not be exposed.

Therefore, by setting the density of the porous resin layer to 22 kg / m ³ or less, the intermediate layer 14 has appropriate flexibility, and the end portion of the corrugated tube 20 is shortened and deformed, and the end portion of the tube 12 In exposing the intermediate layer 14, the intermediate layer 14 can well follow the bending of the end of the corrugated tube 20, and the leaving of the intermediate layer 14 to the outer surface of the tube 12 can be suppressed. As a result, the end of the tube 12 can be easily exposed.

On the other hand, by setting the density of the porous resin layer to 12 kg / m ³ or more, the intermediate layer 14 has appropriate strength, and breakage or breakage of the intermediate layer 14 at the time of processing such as production of the composite pipe 10. The occurrence can be effectively suppressed.

  Here, the density of the porous resin layer can be measured by the method prescribed in JIS-K7222 (2005). The measurement environment is a temperature of 23 ° C. and a relative humidity of 45%.

  The method of controlling the density of the porous resin layer in the above range is not particularly limited, but, for example, a method of adjusting the existing ratio of pores (for example, the foaming ratio in the case of a foam), resin And the like. As a method of adjusting the molecular structure of the resin, it is possible to practically use a method of adjusting the molecular structure of the monomer serving as a raw material of the resin and the cross-linked structure thereof.

  The intermediate layer 14 is, for example, a resin that becomes the corrugated pipe 20 while winding a sheet-like foam member formed in a band shape so as to have a width substantially equal to the outer peripheral length of the pipe 12. Can be formed by supplying and molding it on the outer periphery thereof. In the present embodiment, an elastically deformable foam member is used as the intermediate layer 14.

  The intermediate layer 14 is formed with a compression sandwiching portion 14A which is sandwiched and compressed between the inner side wall 24A of the valley portion 24 and the pipe body 12. The thickness of the intermediate layer 14 is thicker than the difference between the outer periphery of the tubular body 12 and the radially inner side surface of the inner side wall 24A in a natural state (state in which no force such as compression or tension is applied). In the compression sandwiching portion 14A, the intermediate layer 14 is thinner than its natural thickness due to the compression. The convex portion 14B is formed between the adjacent compression sandwiching portions 14A of the intermediate layer 14. The convex portion 14 </ b> B has a diameter larger than that of the compression holding portion 14 </ b> A and protrudes into the mountain space 23. In the mountain space 23, the top (most radially outer portion) of the convex portion 14B and the outer wall 22A are separated. The intermediate layer 14 has the compression holding portion 14A and the convex portion 14B alternately and continuously formed in the axial direction S, and the outer peripheral surface is corrugated.

  The length in the axial direction S in the natural state of the intermediate layer 14 extracted from between the tube body 12 and the corrugated tube 20 is set to be in the range of 90% to 100% of the length in the axial direction S of the corrugated tube 20 There is. When the length of the intermediate layer 14 is set in this manner, the intermediate layer 14 is not held in a stretched state between the tubular body 12 and the corrugated tube 20, so when the corrugated tube 20 is shortened and deformed. The relative movement between the intermediate layer 14 and the corrugated tube 20 is less likely to occur. For this reason, since it becomes easy to shorten and deform | transform the intermediate | middle layer 14 along the axial direction S with the corrugated pipe | tube 20, the edge part of the pipe body 12 can be exposed easily.

(4) Composite pipe assembly 30, 40
8 to 10, the composite pipe assembly 30 has a composite pipe 10 and a saddle 32 for pipe fixing attached to the small diameter portion 26 of the corrugated pipe 20 in the composite pipe 10. In other words, by attaching the saddle 32 to the small diameter portion 26 of the corrugated tube 20 in the composite tube 10, the composite tube assembly 30 is obtained.

  As shown in FIG. 8, the saddle 32 is a pipe fixing member in which, for example, a C-shaped band portion 32A and a pair of fixing portions 32B are integrally formed. The width of the band portion 32A is equal to or slightly smaller than the width of the small diameter portion 26. Further, the thickness of the band portion 32A is equal to, for example, the difference between the peak portion 22 and the small diameter portion 26. The pair of fixing portions 32B extend from both ends of the band portion 32A so as to overlap with each other. A through hole 32C penetrating substantially coaxially is formed in the fixing portion 32B. A screw 36 (FIG. 12) as an example of a fixing means is inserted through the through hole 32C. The configuration of the saddle 32 is not limited to the illustrated example, and a known piping saddle can be used as appropriate.

  In FIG. 10, the composite pipe assembly 40 has a composite pipe 10, a saddle 32, and a pipe fitting 28. In other words, the pipe joint 28 is connected to the end of the pipe body 12 exposed by shortening and deforming the corrugated pipe 20 and the intermediate layer 14 in the axial direction (see FIG. 7). By attaching the saddle 32 to the small diameter portion 26 (see FIG. 8), the composite pipe assembly 40 is obtained.

(5) Construction Method of Composite Pipe 10 In FIG. 10, the construction method of the composite pipe 10 is such that the saddle 32 for pipe fixing is attached to the small diameter portion 26 in advance with respect to the composite pipe 10 It is a method of fixing and laying the composite pipe 10. That is, this construction method is a method of arranging the composite pipe 10 at the installation place 34 in the state of the composite pipe assembly 30 (see FIGS. 8 to 10). The installation site 34 is a wall, a pillar, a beam, etc. under the floor of the building.

  In addition to the composite pipe 10, the corrugated pipe 20 and the intermediate layer are axially shortened and deformed to expose the end of the pipe body, and with the pipe joint 28 connected to the end in advance, the composite pipe 10, the saddle 32 and The pipe fitting 28 may be disposed at the installation point 34. That is, this construction method is a method of arranging the composite pipe 10 at the installation place 34 in the state of the composite pipe assembly 40 (see FIG. 10).

(Action and effect)
According to the composite pipe 10 according to the present embodiment, the following operation and effects can be obtained. Since the small diameter portion 26 wider than the valley portion 24 is formed at the predetermined pitch P in the axial direction S in the corrugated pipe 20 of the composite pipe 10, the small diameter portion 26 is provided with the saddle 32 for fixing the piping. By attaching, the dispersion | variation in the pitch of the saddle 32 at the time of laying of the composite pipe | tube 10 can be suppressed, and construction quality can be improved. In addition, since the measurement of the pitch of the saddle 32 becomes unnecessary, the construction becomes easy.

  Since the saddle 32 is attached to the small diameter portion 26, the protrusion of the saddle 32 from the corrugated pipe 20 is suppressed, so the space required for piping can be reduced and the appearance also becomes good. Also, this makes it possible to lower the floor height of the building. Furthermore, by providing the small diameter portion 26, it is possible to use a saddle 32 smaller than the conventional one. Further, particularly in the case of a composite pipe without the intermediate layer 14, the pipe 12 is centered by the small diameter portion 26 so that the heat retaining property and the muffling property are enhanced.

  In FIGS. 8 to 10, in the composite pipe assembly 30, since the saddle 32 is attached to the composite pipe 10 in advance, the work of attaching the saddle 32 to the composite pipe 10 at the construction site becomes unnecessary, and the number of steps is reduced. Therefore, the composite pipe assembly 30 can be laid easily and in a short time.

  In FIG. 10, in the composite pipe assembly 40, since the pipe joint 28 is connected in advance to the end of the pipe body 12, the work of connecting the pipe joint 28 to the end of the pipe body 12 at the construction site is unnecessary. , Man-hour decreases. For this reason, the composite pipe assembly 40 to which the pipe fitting 28 is connected can be installed easily and in a short time. In addition, since it is possible to conduct a connection test between the pipe joint 28 and the pipe body 12 in advance, it is possible to enhance the reliability of the construction while reducing the number of work steps.

  As described above, according to the present embodiment, the corrugated pipe 20 and the composite pipe 10 can be easily installed using the saddle 32 for fixing the pipe.

  When connecting the composite pipe 10 to, for example, the pipe joint 28, the corrugated pipe 20 is shortened and deformed in the axial direction S with respect to the uncorrugated corrugated pipe 20 shown in FIGS. As shown in FIG. 4 and FIG. 7, a force is exerted in the direction of exposing the end of the tube 12. As shown in FIG. 3, in the corrugated pipe 20, when comparing the outer wall 22A of the peak 22 with the inner wall 24A of the valley 24, the length L1 of the axial direction S of the outer wall 22A is the length of the inner wall 24A. The thickness H1 of the outer side wall 22A is set to be smaller than the thickness H2 of the inner side wall 24A. In particular, the length L1 of the outer side wall 22A is set to 1.2 or more times the length L2 of the inner side wall 24A. Furthermore, the thickness of the corrugated tube 20 is set to 0.1 mm to 0.4 mm. Accordingly, the outer side wall 22A is more easily deformed than the inner side wall 24A, and as shown in FIG. 5, the outer side wall 22A bulges outward in the radial direction R and deforms.

  When the force is continuously applied, as shown in FIG. 6, in the corrugated pipe 20, adjacent peak portions 22 come close to each other, and the outer bent portion 22C of the peak portion 22 deforms inward from this portion, and The inward bending portion 24C of the valley portion 24 is deformed inward from this point. For this reason, as shown in FIG. 7, at the end of the composite pipe 10, a part of the corrugated pipe 20 moves in the direction in which the pipe body 12 is exposed.

  At this time, in the intermediate layer 14, as shown in FIG. 3, the intermediate layer 14 is in close contact with the corrugated pipe 20, and the convex portions 14B are engaged between the side walls 24B of the adjacent valleys 24. Thereby, the intermediate layer 14 follows the movement of the corrugated tube 20 and the intermediate layer 14 easily moves in the same direction. Therefore, as shown in FIG. 4 and FIG. 7, in the operation of exposing the end of the composite pipe 10, the corrugated pipe 20 and the intermediate layer 14 are pushed together (shortened and deformed) along the axial direction S. The 10 ends can be easily exposed. That is, with respect to the movement of the corrugated tube 20, the intermediate layer 14 can be effectively suppressed from being left behind on the outer periphery of the tube 12.

  Furthermore, in the composite pipe 10, since the intermediate layer 14 is formed of a sheet-like foam material, the slidability with respect to the pipe body 12 is improved, and is shown in FIGS. 4 and 7 when connecting to the pipe joint 28. Thus, the corrugated tube 20 can be easily shifted and pushed along the axial direction S.

  Further, in the composite pipe 10, the thickness of the intermediate layer 14 is set to be thicker than the difference between the outer circumference of the tubular body 12 and the inner circumference of the corrugated pipe 20 in the radial direction R in the natural state. For this reason, as shown in FIG. 3, the compression sandwiching portion 14A of the intermediate layer 14 is compressed by the valley portion 24 of the corrugated pipe 20 and is sandwiched. In this portion, the adhesion between the intermediate layer 14 and the corrugated tube 20 can be improved.

  In addition, as shown in FIG. 3, the portion of the convex portion 14B of the intermediate layer 14 enters the peak space 23 of the peak portion 22 of the corrugated tube 20 and is engaged between the side walls 24B of the adjacent valleys 24. Ru. Therefore, when the corrugated pipe 20 is pushed along the axial direction S at the end of the composite pipe 10 and shortened and deformed, the middle layer 14 easily follows the movement of the corrugated pipe 20. The middle layer 14 can be rigidly shortened to expose the end of the tube 12.

  Further, in the composite pipe 10, as shown in FIGS. 5 and 6, when the corrugated pipe 20 is shortened and deformed, the outer wall 22A bulges and deforms at the ridge 22 of the corrugated pipe 20. For this reason, the valley portion 24 may bulge outward in the radial direction R even if the bending angle of the outer bending portion 22C of the corrugated tube 20 or the bending angle of the inner bending portion 24C or the thickness of the outer wall 22A etc. It can suppress that the adjacent peak part 22 comrades do not approach and it will be in a distorted deformation state. Thereby, the fall of the appearance of the end of corrugate tube 20 which carried out shortening deformation can be controlled effectively.

  In the present embodiment, in the corrugated pipe 20 shown in FIG. 3, the thickness H1 of the outer side wall 22A is set thinner than the thickness H2 of the inner side wall 24A, but the thickness H1 of the outer side wall 22A is It may be set to the same degree as the thickness H2 of the inner side wall 24A.

  Further, in the present embodiment, in the corrugated pipe 20 shown in FIG. 3, the cross-sectional shape of the outer side wall 22A is formed in a substantially linear shape along the axial direction S, but becomes convex outward in the radial direction R. The cross-sectional shape of the outer side wall 22A may be formed in an arc shape. In the corrugated pipe 20 configured in this manner, the outer side wall 22A is configured to be easily expanded and deformed outward in the radial direction R. In the valley portion 24 of the corrugated tube 20, the inner side wall 24A may be formed into an arc-shaped cross-sectional shape which is convex inward in the radial direction R.

  Further, in the present embodiment, in the composite pipe 10 shown in FIG. 3, the surface of the intermediate layer 14 on the tube 12 side is a flat surface, and the outer peripheral surface of the tube 12 is substantially in contact with the entire surface. When the intermediate layer 14 and the corrugated tube 20 are relatively moved along the axial direction S with respect to the tube 12 at the end of the composite tube 10, as shown in FIGS. 6 and 7, the end of the tube 12 Is exposed.

  Further, in the composite pipe 10, the length in the axial direction S of the intermediate layer 14 in the natural state is set in the range of 90% to 100% of the length in the same direction of the corrugated pipe 20. At such a ratio, the intermediate layer 14 can be released from the stretched state and held between the tube body 12 and the corrugated tube 20. Therefore, relative movement between the corrugated tube 20 and the intermediate layer 14 is difficult to occur, and the intermediate layer 14 can be shortened and deformed following the shortening deformation of the corrugated tube 20, so that the end of the tube 12 is reliably exposed. It can be done.

  Further, in the composite pipe 10, the MFR of the corrugated pipe 20 is 0.25 or more, and in addition, the intermediate layer 14 is formed of a foam material, so the resin of the corrugated pipe 20 easily enters the air bubbles of the intermediate layer 14 Become. Therefore, the adhesion between the corrugated tube 20 and the intermediate layer 14 can be improved.

Second Embodiment
A composite pipe 10 according to a second embodiment of the present invention will be described using FIGS. 11 and 12.

  The composite pipe 10 according to the present embodiment differs in the configuration in which the intermediate layer 14 of the composite pipe 10 according to the first embodiment is replaced with a composite intermediate layer 140. The composite pipe 10 according to the present embodiment and the composite pipe 10 according to the first embodiment have the same configuration except for the difference in the configuration.

(1) Configuration of Composite Intermediate Layer 140 The composite intermediate layer 140 of the composite pipe 10 is disposed between the intermediate layer 14 of the composite pipe 10 according to the first embodiment, the intermediate layer 14 and the pipe body 12 The sheet-like low-friction resin layer 13 is included. The sliding resistance value of the inner peripheral surface of the low friction resin layer 13, specifically the sliding resistance value with the outer peripheral surface of the tubular body 12, is set to a value smaller than the sliding resistance value of the intermediate layer 14 with the tubular body 12. ing.

(2) Configuration of Low Friction Resin Layer 13 The thickness of the low friction resin layer 13 in the natural state is set to be thinner than the thickness of the intermediate layer 14 in the natural state. In other words, the thickness of the intermediate layer 14 is set to be thicker than the thickness of the low friction resin layer 13. The middle layer 14 has a role of heat protection in the composite tube 10, and the heat protection can be improved as the thickness of the middle layer 14 increases.

  On the other hand, since the thickness of the low friction resin layer 13 is set to be thin, the followability of the low friction resin layer 13 can be improved when the corrugated pipe 20 is deformed in a shortened manner in the axial direction S. Therefore, in the composite intermediate layer 140, the thickness of the intermediate layer 14 is relatively thick, and the thickness of the low-friction resin layer 13 is relatively thin, so that both the thermal protection property and the followability are improved. It is done.

  Further, from the viewpoint of the heat protection property and the followability to the corrugated tube 20, the thickness in the natural state of the intermediate layer 14 is set in the range of 10 times to 200 times the thickness of the low friction resin layer 13. Furthermore, the thickness of the intermediate layer 14 is more preferably set in the range of 20 times to 150 times the thickness of the low friction resin layer 13, and still more preferably set in the range of 25 times to 100 times.

  Describing in detail, the thickness of the low friction resin layer 13 is set in the range of 0.05 mm to 7 mm from the viewpoint of the followability to the corrugated tube 20. The thickness of the low friction resin layer 13 is preferably set in the range of 0.08 mm to 5 mm, and the thickness of the low friction resin layer 13 is further set in the range of 0.1 mm to 3 mm More preferred. Here, the thickness of the low friction resin layer 13 is taken as an average value of values obtained by taking out the low friction resin layer 13 from the composite pipe 10 and measuring three arbitrary places.

  Further, in the radial direction R, the difference between the outer periphery of the low friction resin layer 13 and the inner side wall 24A of the valley portion 24 of the corrugated tube 20, that is, the thickness of the intermediate layer 14 in the compressed and held state is 0.3 mm to 5 mm, for example. It is set to the range. Furthermore, the thickness is preferably set in the range of 0.5 mm to 3 mm, and more preferably in the range of 1 mm to 2 mm.

  Examples of the resin as the low friction resin layer 13 include polyester, nylon, and polyolefin (more specifically, any of polyethylene, polypropylene, and polybutene). As long as the low friction resin layer 13 contains the above-mentioned resin as a main component, the low friction resin layer 13 may contain other additives.

  Examples of the form of the low friction resin layer 13 include nonwoven fabric, knitted fabric, woven fabric, and film. The non-woven fabric includes, for example, melt blow, spun bond and the like. Knitting includes, for example, Russell, Tricot, Milanese and the like. The woven fabric includes, for example, plain weave, twill weave, imitation twill weave, twill weave, entanglement and the like.

  In particular, a polyester non-woven fabric containing polyester as a main component, a polyester tricot, a nylon non-woven fabric containing nylon as a main component, a nylon tricot, and a polyethylene film containing polyethylene as a low friction resin layer 13 are preferable. Furthermore, for the low friction resin layer 13, polyester non-woven fabric or nylon tricot is more preferable.

Also, if the nonwoven fabric is employed in the low-friction resin layer 13, the basis weight of the nonwoven fabric is set in a range of, for example ^{10g / m 2 ~500g / m 2} . Also, the basis weight of the nonwoven fabric is is preferably set in a range of ^{12g / m 2 ~200g / m 2} , further basis weight of the nonwoven fabric more be set in the range of ^15g / ^{m 2 ~25g} / m 2 preferable.

  The sliding resistance value (unit: "N") on the inner peripheral surface of the low friction resin layer 13 is not particularly limited as long as it is smaller than the sliding resistance value on the inner peripheral surface of the intermediate layer 14; It is set. Preferably, the slip resistance value is set in the range of 12N to 23N.

  The sliding resistance value on the inner peripheral surface of the low friction resin layer 13 is set to 0.36 times to 0.90 times the sliding resistance value on the inner peripheral surface of the intermediate layer 14, preferably 0.44 times. It is set in the range of ~ 0.85 times.

  The inner circumferential surface of the low friction resin layer 13 covers the outer periphery of the tube 12 while being in full contact with the outer periphery of the tube 12. Here, "entirely contact" means that all parts do not have to be in intimate contact and substantially all surfaces are in contact. Therefore, in the concept of “entirely contact”, the low friction resin layer 13 and the intermediate layer 14 or the tube 12 may be partially peeled off at the joint of the composite intermediate layer 140 wound around the tube 12. included. In addition, also in the case where the low friction resin layer 13 and the intermediate layer 14 or the tube 12 are partially peeled off due to the complex intermediate layer 140 being wrinkled between the tube 12 and the corrugated tube 20, It is included in the concept of “contact”.

  As a method of bonding the middle layer 14 and the low friction resin layer 13 in the composite middle layer 140, in addition to a method of applying and bonding an adhesive between both layers, a method of bonding by a frame laminating method may be mentioned. . In particular, the latter frame laminating method is preferred. That is, the composite intermediate layer 140 is configured as a frame-laminated adhesive (hereinafter, also simply referred to as a "flare adhesive").

  Specifically, in the flame laminating method, for example, a soluble substance contained in the intermediate layer (porous resin layer) 14 is thermally melted by flame and exuded, and a low friction resin is used by using the exuded melt. It is a method of adhering to the layer 13. The composite intermediate layer 140 formed of the flash adhesive can be made thinner as compared to the case where the adhesive is applied and formed. For this reason, in the case of the composite pipe 10 including the peel adhesive body as the composite intermediate layer 140, the followability to the corrugated pipe 20 can be improved when the end of the pipe body 12 is exposed.

  In the composite pipe 10 according to the present embodiment, by providing the composite intermediate layer 140, the end of the corrugated pipe 20 is shortened and deformed to expose the end of the pipe 12, and then the corrugated pipe 20 is returned. In this case, the entrapment of the intermediate layer 14 can be effectively suppressed.

  In the composite pipe 10 according to the present embodiment, the composite intermediate layer 140 includes the low friction resin layer 13. That is, since the sliding resistance value generated between the pipe body 12 and the low friction resin layer 13 is smaller than the sliding resistance value generated between the pipe body 12 and the intermediate layer 14, the composite intermediate layer to the pipe body 12 140 is slippery.

  Therefore, in the composite pipe 10, after the end of the corrugated pipe 20 is shortened and deformed to expose the end of the pipe 12, when the end of the corrugated pipe 20 is returned again, the composite intermediate layer 140 is obtained. Of the corrugated tube 20 follow the movement of the stretch along the axial direction S well. Therefore, the end of the composite intermediate layer 140 can be effectively suppressed from being caught. As a result, since the ends of the corrugated pipe 20 and the composite intermediate layer 140 can be cleanly returned to the original positions, the appearance of the composite pipe 10 is not impaired.

  Here, the "slip resistance value" is measured, for example, as follows. In the case of measuring the sliding resistance value on the inner peripheral surface of the low friction resin layer 13, first, the corrugated pipe 20 is disposed on the outer peripheral side of the pipe body 12, and the composite intermediate layer 140 is inserted between the pipe body 12 and the corrugated pipe 20. Do. The low friction resin layer 13 of the composite intermediate layer 140 is inserted in contact with the tubular body 12. The composite tube 10 is manufactured to have a length of 200 mm in the axial direction S. Then, one end of the composite pipe 10 is connected to the tip of the force gauge (IMADA popular digital force gauge DS2), and the corrugated pipe 20 is 50 mm along the axial direction S at the other end of the composite pipe 10 The force (unit: N) at the time of shifting is measured.

[Other embodiments]
As mentioned above, although an example of the embodiment of the present invention was described, the embodiment of the present invention is not limited to the above, and besides the above, it can be variously modified and carried out in the range which does not deviate from the main point Of course there is one.

  In the above embodiment, although the corrugated pipe 20 constitutes a part of the composite pipe 10, it is also possible to use the corrugated pipe 20 alone and arrange it at the laying place 34 by the saddle 32.

  DESCRIPTION OF SYMBOLS 10 ... Composite tube, 12 ... Tube body, 13 ... Low friction resin layer, 14 ... Intermediate layer, 20 ... Corrugated tube, 22 ... Peak part, 24 ... Valley part, 30 ... Composite tube assembly, 32 ... Saddle, 34 ... Installation location, 40 ... composite pipe assembly, P ... pitch of small diameter part

Claims (6)

  An annular peak that is tubular and convex outward in the radial direction and an annular valley that is concave outward in the radial direction are alternately formed in the axial direction to form a bellows, and the outer side in the radial direction becomes concave A corrugated tube in which a small diameter portion wider than a valley portion is formed at a predetermined pitch in the axial direction. The corrugated pipe according to claim 1, which can be shortened in the axial direction at the peak and the valley.
A tube disposed inside the corrugated tube;
A composite tube having an intermediate layer disposed between the tube and the corrugated tube. A composite pipe according to claim 2;
A pipe fixing saddle attached to the small diameter portion of the corrugated pipe in the composite pipe;
Composite pipe assembly having:   The composite pipe assembly according to claim 3, further comprising a pipe joint connected to an end of the pipe body exposed by shortening and deforming the corrugated pipe and the intermediate layer in the axial direction. An annular peak that is tubular and convex outward in the radial direction and an annular valley that is concave outward in the radial direction are alternately formed in the axial direction to form a bellows, and the outer side in the radial direction becomes concave A corrugated tube which is formed at a predetermined pitch in the axial direction and which has a smaller diameter portion wider than the valley, and which can be shortened in the axial direction at the peak and the valley;
A tube disposed inside the corrugated tube;
For a composite tube having an intermediate layer disposed between the tube and the corrugated tube and sandwiched between the valley and the tube,
Install a saddle for fixing the pipe to the small diameter part in advance,
The construction method of the composite pipe which fixes the said saddle to a laying location and lays the said composite pipe.   With the corrugated pipe and the intermediate layer shortened in the axial direction to expose the end of the pipe body, and in a state where a pipe joint is connected to the end in advance, the composite pipe and the pipe joint are placed at the installation location The construction method of the composite pipe according to claim 5 to arrange.