WO2015099128A1 - Piping structure, and corrugated pipe with ribs - Google Patents

Abstract

A piping structure (10) is obtained by connecting a corrugated pipe (1), which is a first corrugated pipe, and a corrugated pipe (2), which is a second corrugated pipe. An end of the corrugated pipe (2) is connected to an end of the corrugated pipe (1) so as to cover the end of the corrugated pipe (1). This means that the corrugated pipe (2) has a greater size than the corrugated pipe (1). Consequently, the corrugated pipe (1) serves as an inner pipe, and the corrugated pipe (2) serves as an outer pipe. The corrugated pipe (1) and the corrugated pipe (2) are connected to each other in such a manner that: crests of the corrugated pipe (1) and the corrugated pipe (2) are fitted to each other; and troughs of the corrugated pipe (1) and the corrugated pipe (2) are fitted to each other. Consequently, the corrugated pipe (1) and the corrugated pipe (2) are prevented from coming out of each other.

Description

Piping structure, corrugated pipe with ribs

The present invention relates to a piping structure using a corrugated pipe having an opening continuous in the longitudinal direction and having excellent linear shape retention.

Conventionally, when laying an electric wire or the like, the electric wire or the like is inserted into a protective tube. Usually, since a protective tube is tubular, in order to insert an electric wire into such a tubular member, it is necessary to sequentially feed the electric wire from an end portion. However, this work has not always been easy.

On the other hand, there is a method in which a part of the tubular member is cut along the longitudinal direction, and an electric wire is inserted from the cut. In this case, workability is good because there is no need to feed the electric wires in the longitudinal direction.

As such a protective tube having a cut in the longitudinal direction, there is a protective tube in which a part of the end portions is overlapped (Patent Document 1).

Special table 2009-542180 gazette

The tubular member of Patent Document 1 can maintain a closed state by overlapping the ends of each other. However, it is difficult for the tubular member having a corrugated like Patent Document 1 to maintain a linear shape because of its flexibility. For this reason, since the tubular member is easily bent by its own weight or external force at the time of laying, it looks bad and laying work is not easy.

The present invention has been made in view of such a problem, and an object thereof is to provide a piping structure using a corrugated pipe having excellent linear shape retention.

In order to achieve the above-described object, the first invention is such that a first corrugated pipe and a second corrugated pipe are connected, and the first corrugated pipe includes an inner member and an outer member, In the inner member, a plurality of crests and troughs extending in the circumferential direction are alternately formed at predetermined intervals in the tube axis direction, and in the outer member, crests and troughs extending in the circumferential direction are formed at predetermined intervals in the tube axis direction. The second corrugated tube has a cross-sectional shape corresponding to the cross-sectional shape of the first corrugated tube, and an opening that is continuous in a tube axis direction with a part of the circumferential direction of the second corrugated tube. And a corrugated portion in which crests and troughs are alternately formed in the tube axis direction on the outer periphery of the second corrugated tube, and a tube axis direction separated by a predetermined distance in the circumferential direction of the second corrugated tube A plurality of linear rib portions extending to the second, In the circumferential direction of the Lugate tube, the corrugated portion and the rib portion are alternately formed, one of the first corrugated tube and the second corrugated tube is an inner tube, the other is an outer tube, The pipe structure is characterized in that the end of the outer pipe is covered with the end.

The first corrugated tube further includes a hinge portion for opening or fitting the inner member and the outer member, and an extending portion is formed on the tube opening side in the tube vertical cross section of the inner member, The inner member includes a curved portion and a straight portion, and in the tube vertical cross section of the outer member, an extending portion is formed on the tube opening side, and the outer member includes a curved portion and a straight portion, The extending portion of each of the inner member and the outer member may be overlapped by bending the hinge portion, and the cross section may be a closed tube. Further, the inner member may have a curved portion between the hinge portion and the straight portion as the extending portion. The member length of the outer member may be longer than the inner member.

The crest portion of the outer tube and the crest portion of the inner tube may be fitted, and the trough portion of the outer tube and the trough portion of the inner tube may be fitted.

The rib part and the corrugated part adjacent to the rib part are formed in order from one end part of the opening part at one end part of the opening part of the second corrugated pipe, At the other end of the opening, the corrugated portion and the rib portion adjacent to the corrugated portion are formed in order from the other end of the opening, and both end portions of the opening of the second corrugated tube By overlapping, the corrugated portions at both ends may be fitted together.

The rib part formed so as to cross a part of the corrugated part at a predetermined distance in the circumferential direction of the second corrugated pipe is formed to be equal to or higher than the peak part of the corrugated part. Alternatively, the corrugated portion may be formed at the same height as the valley portion or lower than the valley portion.

At least one of the first corrugated tube and the second corrugated tube is formed such that small diameter portions and large diameter portions are alternately formed in the tube axis direction, and the large diameter portion is fitted to the small diameter portion. The first corrugated tubes or the second corrugated tubes may be connected in the tube axis direction.

In at least one of the first corrugated tube and the second corrugated tube, one end is the small diameter portion, the other end is the large diameter portion, and the large diameter portion covers the small diameter portion. The plurality of first corrugated tubes or the plurality of second corrugated tubes may be connected in the axial direction.

The pipe structure may have a straight part and a bent part in a part of the pipe axis direction, and the bent part may be constituted only by the first corrugated pipe.

An electric wire may be arranged inside the piping structure.

The first corrugated pipe is in a state where the extending portions of the inner member and the outer member are not fitted to each other, and in any case described above, The opening dimension between the end of the extending part and the hinge part is larger than the opening dimension between the end of the extending part of the outer member and the hinge part, and the extension of the outer member It is desirable that the opening dimension between the end of the part and the hinge part is larger than twice the radius of curvature of the curved part of the inner member.

The inner member and the outer member of the first corrugated tube may each include a curved portion between the hinge portion and the extending portion in the tube vertical cross section, and the extending portion may include a straight portion. . That is, the inner member may include a curved portion adjacent to the hinge portion and a straight portion as an extending portion.

In the first corrugated tube, one end portion of each of the curved portions of the inner member and the outer member may be connected to a hinge portion, and the other end portion may be connected to an extending portion.

Further, the first corrugated pipe has at least one of the curved member portions of the inner member and the outer member connected to the hinge portion via the straight portion, and the other end portion extending. Can be connected with the part.

In the first corrugated tube, it is desirable that the inner member and the outer member have the same radius of curvature. The extending part of the inner member may be constituted by a straight part, and the extending part of the outer member may be constituted by a straight part and a curved part.

The first corrugated pipe has a tapered portion formed on the outer surface side at the end portion of the extending portion of the inner member, and a tapered portion formed on the inner surface side at the end portion of the extending portion of the outer member. When the extended portions of the member and the outer member are fitted to each other, it is desirable that the tapered portion of the extended portion of the inner member is fitted to face the tapered portion of the extended portion of the outer member.

The first corrugated pipe has at least a part of a structure in which peaks and valleys of the inner member and the outer member are fitted when the extended portions of the inner member and the outer member are fitted to each other. Is desirable.

In the first corrugated pipe, the opening width of the outer surface of the valley portion of the inner member is smaller than the maximum width of the protrusion on the inner surface of the valley portion of the outer member, and the maximum width of the outer surface of the inner portion of the inner member is When the crests and troughs of the inner member and the outer member are fitted together, the crests and troughs are press-fitted together while the opening width is expanded. Can also be combined.

The first corrugated tube is provided with a fitting protrusion on one of the overlapping portions of the inner member and the outer member, and a fitting hole on the other, and allows the extended portions of the inner member and the outer member to be fitted to each other. It is desirable that the fitting protrusion and the fitting hole are fitted to each other.

The first corrugated tube may be formed with a plurality of cuts or slits in the hinge portion in accordance with the shape of the mountain and valley portions.

The first corrugated tube may have a plurality of irregularities or protrusions on the hinge portion.

The first corrugated tube can also have an electric wire disposed inside.

According to the first invention, since the second corrugated tube has the rib portion extending in the tube axis direction on the outer peripheral portion, the linear shape retainability of the corrugated tube is excellent. Moreover, since the 1st corrugated pipe is a corrugated pipe which has the conventional corrugated shape, its flexibility is high and its strength is also high. Therefore, the corrugated tube alone can be used as a cable protection tube. For this reason, the piping structure which combined these can combine the part which is excellent in linear shape retainability, and the part which is excellent in flexibility with a site | part.

Further, by fitting the peaks and valleys of the first corrugated pipe and the second corrugated pipe, the corrugated pipes can be reliably connected to each other, and disconnection and disconnection can be prevented. Here, in the piping structure of the present invention, the second corrugated pipe has a rib portion extending in the pipe axis direction on the outer peripheral portion, and the first corrugated pipe and the second corrugated pipe are crests and troughs. Are fitted, and each has a continuous opening in the tube axis direction, and can be overlapped so that the extending portions on the opening side overlap each other to form a closed tube cross-sectional shape, which will be described later. Thus, the pipe cross section may have any shape. For example, it may be a circular diameter, a substantially circular shape, a substantially elliptical shape, an oval shape, etc. In addition to the above, there are special dimensional constraints on the opening size and curved portion shape of the inner member and the outer member as shown in the embodiments. However, the present invention is not limited to the shape defined in the present application, and an arbitrary cross-sectional shape can be applied.

Further, the closed end of the corrugated tube can be stably held by overlapping the opening end portions of the second corrugated tube so that the rib portions and the corrugated portions overlap each other.

When the second corrugated pipe is fitted to the outside of the first corrugated pipe, the height of the rib part of the second corrugated pipe is the same as or higher than the peak part. It does not become smaller than the inner diameter of the inner surface. For this reason, when fitting the second corrugated tube outside the first corrugated tube, when the two ridges and the valleys are fitted to each other, the fitting of the overlapping portion becomes shallow by the rib portion. There is nothing. Also, when fitting the second corrugated pipe inside the first corrugated pipe, the height of the rib part of the second corrugated pipe is the same as or lower than the valley part, so the outer diameter of the rib part outer surface is It does not become larger than the outer diameter of the valley outer surface. For this reason, when fitting a 2nd corrugated pipe inside the 1st corrugated pipe, when fitting both peak parts and trough parts, fitting of an overlap part becomes shallow by a rib part. There is nothing.

Also, a plurality of corrugated tubes can be easily connected by alternately forming large diameter portions and small diameter portions on the corrugated tube and fitting the large diameter portions and small diameter portions together. In this case, the corrugated pipes can be connected without being cut or the like by adopting a unit structure in which one end portion is a large diameter portion and the other end portion is a small diameter portion.

Further, by arranging the second corrugated pipe having an excellent linear shape in the straight portion and arranging the first corrugated pipe at the bent portion, a desired piping laying form can be stably maintained.

Moreover, even if an electric wire is arranged inside, the inner electric wire can be securely held.

Moreover, the opening dimension between the extending part end part of the inner member and the hinge part in the vertical section of the pipe is larger than the opening dimension between the extending part end part of the outer member and the hinge part. For this reason, the insertion operation of an electric wire is easy and the retention strength at the time of closing becomes large. Moreover, the opening dimension between the extension part edge part of an outer side member and a hinge part is larger than twice the curvature radius of the curve part of an inner side member. For this reason, an overlapping part does not become large too much and it is easy to fit each other.

According to a second aspect of the present invention, there is provided a corrugated portion having an opening continuous in the tube axis direction in a part of the circumferential direction, and a corrugated portion in which peaks and valleys are alternately formed in the tube axis direction on the outer periphery of the tube, A plurality of linear rib portions extending in the tube axis direction so as to cross a part of the corrugated portion at a predetermined distance in the circumferential direction, and in the circumferential direction of the corrugated tube, the corrugated portion and the corrugated portion It is a corrugated pipe with a rib by which a rib part is formed alternately.

Small-diameter portions and large-diameter portions are alternately formed in the tube axis direction of the corrugated tube with ribs, the large-diameter portions are fitted into the small-diameter portion, and the corrugated tubes with ribs are connected to each other in the tube axis direction. May be.

One end of the corrugated pipe with ribs in the tube axis direction is the small diameter portion, the other end is the large diameter portion, the large diameter portion is covered with the small diameter portion, and a plurality of the ribs are attached. The corrugated tubes may be connected in the axial direction.

According to the second invention, it is possible to obtain a corrugated tube excellent in linear shape retention.

Also, a plurality of corrugated tubes can be easily connected by alternately forming large diameter portions and small diameter portions on the corrugated tube with ribs and fitting the large diameter portions and small diameter portions to each other. At this time, the corrugated tubes with ribs can be connected without being cut or the like by adopting a unit structure in which one end portion is a large diameter portion and the other end portion is a small diameter portion.

Moreover, as a manufacturing method of a corrugated pipe that can be opened and closed, an inner member and an outer member each having at least a curved portion and an extending portion, and a hinge portion that connects one end of each of the inner member and the outer member, Forming a corrugated pipe material having a connecting portion that is substantially opposite to the hinge portion and connects ends of the extended portions, which are the other ends of the inner member and the outer member, and the connecting portion; In this case, the opening dimension between the end portion of the extending portion of the inner member and the hinge portion is set to the opening size between the end portion of the extending portion of the outer member and the hinge portion. The opening dimension between the end of the extended portion of the outer member and the hinge portion may be larger than twice the radius of curvature of the curved portion of the inner member.

In this case, when the connection portion of the corrugated tube material is cut, a taper portion is formed on the outer surface side at the opening end portion of the inner member, and a taper portion is formed on the inner surface side at the opening end portion of the outer member. After the connection portion is cut, when the extending portions of the inner member and the outer member are fitted to each other, the taper portion of the end portion of the extending portion of the inner member is made to extend the extending portion of the outer member. It may be possible to slidably fit the tapered portion at the end portion of the installed portion.

In this way, it is possible to obtain a corrugated tube excellent in electric wire insertion workability and holding power when closed.

Also, by forming a tapered portion at the end, the end of the inner member can be guided to the inside of the outer member when closing. Therefore, it is easy to fit the inner member and the outer member.

Moreover, as a manufacturing method of the corrugated tube material, the corrugated tube material includes an inner member and an outer member having at least a curved portion and an extending portion, and a hinge that connects one end of each of the inner member and the outer member. And a connection portion that is substantially opposite to the hinge portion and connects the ends of the extended portion, which are the other ends of the inner member and the outer member, with the hinge portion interposed therebetween. An asymmetric cross-section is substantially oval, with the maximum diameter of the ellipse of the corrugated tube material as the major axis, and passing through the hinge part, the major axis is divided into two equal parts, and a straight line perpendicular to the major axis is the minor axis When the short axis is a dividing line of the mold, each of the pair of molds formed so as to include either the inner member or the outer member with respect to the dividing line is formed in a loop shape. Multiple connections, each route In a part of the above, a pair of the molds face each other, and a resin tube is supplied by extrusion molding into the pair of molds that are combined to face each other. While synchronizing with the extrusion speed, the mold can be repeatedly transported and supplied, and the resin tube can be sucked into the mold and formed into a shape matching the mold shape.

In this way, it is possible to obtain a corrugated tube material excellent in wire insertion workability and holding power when closed.

According to the present invention, it is possible to provide a piping structure using a corrugated pipe excellent in linear shape retention.

FIG. 2 is a plan view showing a piping structure 10. It is a figure which shows the cross section of the piping structure 10, Comprising: The SS sectional view taken on the line of FIG. FIG. 2 is a cross-sectional view of the piping structure 10 taken along the line TT in FIG. The perspective view which shows the corrugated pipe | tube 1 of the open state. The front view seen from the pipe-axis direction which shows the corrugated pipe 1 of the open state. The figure which shows the process of closing the corrugated pipe. The figure which shows the process of closing the corrugated pipe. The elements on larger scale which show the process of closing the corrugated pipe | tube 1. FIG. The elements on larger scale which show the process of closing the corrugated pipe | tube 1. FIG. The elements on larger scale which show the process of closing the corrugated pipe | tube 1. FIG. The front view seen from the pipe-axis direction which shows the corrugated pipe 1 of the closed state. Sectional drawing which shows the peak part 9 and the trough part 11 of the outer side member 5. FIG. Sectional drawing which shows the peak part 13 and the trough part 15 of the inner side member 3. FIG. Sectional drawing which shows the state which made the peak part and trough part of the inner side member 3 and the outer side member 5 fit. Sectional drawing which shows the other peak part 9 and trough part 11 of the outer side member 5. FIG. Sectional drawing which shows the other peak part 13 and trough part 15 of the inner side member 3. FIG. Sectional drawing which shows the state which made the peak part and trough part of the inner side member 3 and the outer side member 5 fit. Sectional drawing which shows the other peak part 13 and trough part 15 of the inner side member 3. FIG. The top view which shows the corrugated pipe 1a. The front view seen from the pipe-axis direction which shows the corrugated pipe 1a of the closed state. The R section enlarged view of Fig.11 (a). The bottom view which shows the corrugated pipe 1b. The bottom view which shows the corrugated pipe 1c. FIG. 14 is a cross-sectional view taken along the line PP in the O portion of FIG. The perspective view which shows the corrugated pipe | tube 2 of the open state. The front view seen from the pipe-axis direction which shows the corrugated pipe 2 of the open state. The front view which looked at the corrugated pipe 2 of the closed state from the pipe-axis direction. The figure which shows the laying state of the piping structure 10. FIG. The top view which shows the corrugated pipe | tube 2a. FIG. 19 is a cross-sectional view of the corrugated pipe 2a, taken along the line UU in FIG. FIG. 19 is a cross-sectional view of the corrugated tube 2a, taken along line VV in FIG. The top view which shows the state which connected the corrugated pipes 2a. Sectional drawing which shows the state which connected the corrugated pipes 2a. The front view seen from the pipe-axis direction which shows the corrugated pipe 1d of the open state. The front view seen from the pipe-axis direction which shows the corrugated pipe 1e of the open state. FIG. 3 is a front view of the corrugated pipe 1e in a closed state as seen from the pipe axis direction. The front view seen from the pipe-axis direction which shows the corrugated pipe 1f of the open state. The figure which shows the pipe raw material manufacturing apparatus 60. FIG. The figure which shows the corrugated pipe raw material 71. FIG.

(Piping structure)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a plan view showing the piping structure 10, FIG. 2 (a) is a sectional view taken along the line SS of FIG. 1, and FIG. 2 (b) is a sectional view taken along the line TT of FIG. The piping structure 10 is configured by connecting a corrugated pipe 1 that is a first corrugated pipe and a corrugated pipe 2 that is a second corrugated pipe.

The corrugated pipe 1 has a plurality of crests 9 and troughs 11 extending in the circumferential direction alternately at predetermined intervals in the pipe axis direction. Similarly, in the corrugated tube 2, a plurality of crest portions 38 and trough portions 34 extending in the circumferential direction are alternately formed at predetermined intervals in the tube axis direction.

Further, the corrugated tube 2 is formed with a linear rib portion 4 extending in the tube axis direction. A plurality of rib portions 4 are formed at a predetermined distance in the circumferential direction of the corrugated tube 2. Here, the part where the peak portion 38 (35) and the valley portion 34 (32) are formed becomes the corrugated portion 6. Therefore, the rib portion 4 is formed in a straight line so as to cross a part of the corrugated portion 6. A detailed description of the structure of the corrugated tubes 1 and 2 will be given later.

As shown in FIG. 2 (a), the end of the corrugated tube 2 is connected so as to cover the end of the corrugated tube 1. That is, the size of the corrugated tube 2 is larger than the size of the corrugated tube 2. Accordingly, the corrugated tube 1 is an inner tube and the corrugated tube 2 is an outer tube. At this time, the peak portions and the valley portions of the corrugated pipe 1 and the corrugated pipe 2 are fitted and connected to each other. For this reason, the corrugated pipes 1 and 2 do not come off.

In this embodiment, the corrugated tube 2 is an outer tube and the corrugated tube 1 is an inner tube, but the present invention is not limited to this. The corrugated tube 1 may be an outer tube, and the corrugated tube 2 may be an inner tube. In the following description, an example in which the corrugated tube 1 is an inner tube and the corrugated tube 2 is an outer tube will be described.

As shown in FIG. 2B, the rib portion 4 of the corrugated tube 2 has no irregularities formed on the inner and outer surfaces of the tube with respect to the tube axis direction. For this reason, in the rib part 4, the corrugated pipes 1 and 2 are not fitted.

In addition, the height of the rib part 4 is substantially the same as the height of the mountain part 38 (35). Therefore, the inner diameter of the rib portion 4 substantially matches the inner diameter of the peak portion 38 of the corrugated tube 2. Therefore, the top part of the peak part 9 of the corrugated pipe 1 does not interfere with the rib part 4 in a state where the top part of the corrugated part 6 of the corrugated pipe 2 is fitted. For this reason, when the peak parts and trough parts of the corrugated pipes 1 and 2 are fitted to each other, the rib part 4 does not make the fitting of the overlapping parts shallow. In addition, the height of the rib part 4 may be higher than the peak part 38 (35).

(1st corrugated pipe)
(First embodiment)
Next, details of the corrugated tube 1 will be described. FIG. 3 is a perspective view showing the corrugated tube 1, and FIG. 4 is a front view seen from the tube axis direction. The corrugated tube 1 includes an inner member 3, an outer member 5, a hinge portion 7, and the like.

The inner member 3 has a plurality of crests 13 and troughs 15 extending in the circumferential direction alternately formed at predetermined intervals in the tube axis direction. Similarly, the outer member 5 has a plurality of crests 9 and troughs 11 extending in the circumferential direction alternately formed at predetermined intervals in the tube axis direction. The inner member 3 and the outer member 5 are connected by a hinge portion 7.

As shown in FIG. 4, one end of the inner member 3 is connected to the hinge portion 7. A predetermined range from the joint portion of the inner member 3 to the hinge portion 7 is a curved portion 17. The curved portion 17 has a constant radius of curvature C. A portion extending from the other end side of the curved portion 17 toward the tube opening portion is a straight portion 25. In addition, although the extension part can be comprised from either a linear part or a curve part, or both of a linear part or a curve part, the extension part 27 of the inner member 3 is comprised only from the linear part 25 in FIG. Is done.

One end portion of the outer member 5 is connected to the hinge portion 7. A predetermined range from the joint portion of the outer member 5 to the hinge portion 7 is a curved portion 18. The curved portion 18 has a constant radius of curvature D. A predetermined range from the other end side of the curved portion 18 is a straight portion 19. Further, a portion extending from the end portion of the straight portion 19 toward the tube opening portion is a curved portion 21. The curved portion 21 has a constant radius of curvature E. In addition, the part which match | combined the linear part 19 and the curved part 21 of the outer member 5 is called the extension part 23. FIG. That is, in FIG. 4, the outer member 5 is composed of the curved portion 18 and the extending portion 23 from the hinge portion 7 side, and the extending portion 23 is composed of the straight portion 19 and the curved portion 21.

The member length of the outer member 5 (that is, the total length from the connecting portion with the hinge portion 7 to the end portion of the extending portion 23) is the member length of the inner member 3 (that is, from the connecting portion with the hinge portion 7). The total length up to the end of the extended portion 27) is longer.

Further, in this embodiment, the opening dimension (A in the figure) between the end portion of the extending portion 27 of the inner member and the hinge portion 7 is the outer member before the inner member 3 and the outer member 5 are closed. 5 is desirably larger than the opening dimension (B in the drawing) between the end of the extended portion 23 (curved portion 21) and the hinge portion 7. Moreover, the opening dimension (E in the figure) between the extended part 23 end part of the outer member 5 and the hinge part 7 is larger than twice the curvature radius (C in the figure) of the curved part 17 of the inner member 3. Is desirable. That is,
A>B> 2C
It is desirable to satisfy the relationship.

Here, it is desirable that the curvature radii C, D, and E of the curved portions are substantially the same. By doing in this way, when the pipe | tube mentioned later is closed, a mutual overlap part can be fitted reliably, and the shape of the obstruction | occlusion pipe | tube can be made into a flat pipe | tube shape. For this reason, 2C in the above formula may be 2D or 2E.

Thus, by making the opening dimension between the end part of the extending part 27 and the hinge part 7 larger than the opening dimension between the extending part 23 end part and the hinge part 7, the electric wire described later Good insertion workability. Further, if the opening dimension between the end of the extended portion 23 and the hinge portion 7 is increased, the overlapping length described later is shortened, so that the holding force in the closed state is weakened. For this reason, it is desirable that A> B.

Moreover, the opening dimension between the extension part 23 end part and the hinge part 7 is made larger than twice the curvature radius of the curved part 17 of the inner member 3 (that is, the diameter of the circle having the curved part 17). It is possible to suppress the superposition length from becoming excessively long. This is because if the overlapping length becomes too long, it becomes difficult to fit the inner member 3 and the outer member 5 described later. For this reason, it is desirable that B> 2C. In addition, said relationship is satisfied also in arbitrary pipe | tube vertical cross sections.

In the present invention, the cross-sectional shape of the corrugated tube 1 is not limited to the above-described example. The shape is not limited as long as it has an opening continuous in the tube axis direction and can be formed by overlapping the extended portions 23 and 27 on the opening side so as to overlap each other. Here, the hinge part is not particularly limited in the shape of the hinge part as long as the inner member and the outer member can be fitted by bending the inner member and the outer member.

Next, a method of using the corrugated pipe 1 according to this embodiment will be described. FIG. 5A is a diagram showing a released state of the corrugated pipe 1. With the corrugated tube 1 open, the electric wire 29 is inserted into the inner member 3 from the opening, for example. Note that a plurality of electric wires 29 may be provided. At this time, as described above, since the opening width of the inner member 3 is sufficiently wide, the insertion operation of the electric wire 29 is easy.

Next, as shown in FIG. 5B, the inner member 3 and the outer member 5 are closed (arrow F in the figure). That is, the ends of the extending portions 23 and 27 are brought close to each other. In addition, at the moment when the tips of the extending portions 23 and 27 come into contact with each other, the tip of the inner member 3 is slightly crushed as necessary, so that the inner member 3 is more reliably brought into the inner surface side of the outer member 5. Can be fitted.

Next, as shown in FIG. 5B, the inner member 3 and the outer member 5 are closed (arrow F in the figure). That is, the ends of the extending portions 23 and 27 are brought close to each other.

6 (a) to 6 (c) are diagrams showing a process in which the extending portions 23 and 27 are fitted, and are enlarged views of the G portion in FIG. 5 (b). First, when the inner member 3 and the outer member 5 are closed, the ends of the extending portions 23 and 27 approach each other as shown in FIG. 6A (arrow F in the figure).

Here, a tapered portion 33 is provided on the outer surface side of the extending portion 27 of the inner member. That is, the taper portion 33 is formed such that the tip position on the inner peripheral side protrudes toward the opposing outer member 5 with respect to the tip position on the outer peripheral side of the extending portion 27. Similarly, a tapered portion 31 is provided on the inner surface side of the extending portion 23 of the outer member. That is, the tapered portion 31 is formed such that the distal end position on the outer peripheral side protrudes toward the opposing inner member 3 side with respect to the distal end position on the inner peripheral side of the extending portion 23.

For this reason, as shown in FIG. 6B, when the extending portion 23 of the outer member and the extending portion 27 of the inner member abut, the tip of the extending portion 27 of the inner member is formed by the tapered portions 31 and 33. Are opposed to the inside of the extending portion 23 of the outer member. In addition, at the moment when the tips of the extending portions 23 and 27 come into contact with each other, the tip of the inner member 3 is slightly crushed as necessary, so that the inner member 3 is more reliably brought into the inner surface side of the outer member 5. Can be fitted.

In this state, when the inner member 3 and the outer member 5 are further closed, as shown in FIG. 6C, the tip of the extended portion 27 of the inner member slides inside the extended portion 23 of the outer member. Be guided. That is, the inner member 3 is guided inside the outer member 5.

FIG. 7 is a view showing a state in which the inner member 3 and the outer member 5 are further closed as they are, and the extending portions 23 and 27 are completely fitted. That is, the extended sections 23 and 27 of the inner member 3 and the outer member 5 are overlapped and fitted to each other, whereby a flat tube-shaped closed tube cross section can be obtained.

FIG. 8A is a partial cross-sectional view of the crest 9 and trough 11 of the outer member 5, and FIG. 8B is a partial cross-sectional view of the crest 13 and trough 15 of the inner member 3. As described above, a plurality of crests 9 and troughs 11 are alternately formed on the outer peripheral surface of the outer member 5. A plurality of crests 13 and troughs 15 are alternately formed on the outer peripheral surface of the inner member 3. Here, the formation interval of the crests 9 or troughs 11 of the outer member 5 in the tube axis direction is equal to the formation interval of the crests 13 or troughs 15 of the inner member 3.

Further, the crest 9 of the outer member 5 is wider than the crest 13 of the inner member 3, and the trough 15 of the inner member 3 is wider than the trough 11 of the outer member 5, more specifically. The opening width on the inner surface side of the mountain portion 9 is wider than the width of the mountain portion 13. The opening width of the valley portion 15 is wider than the protrusion width on the inner surface side of the valley portion 11.

For this reason, as shown in FIG. 8C, the peak portion of the inner member 3 is fitted into the inner surface side of the peak portion 9 of the outer member 5, and the valley portion 15 of the outer member 5 is the valley of the inner member 3. Fits into part 11. That is, the peak portions and the valley portions of the inner member 3 and the outer member 5 are fitted to each other. It is desirable that the side taper angle on the inner surface side of the peak portion 9 and the side taper angle on the outer surface side of the peak portion 13 are substantially matched. That is, it is desirable that the side surface taper angle on the inner surface side of the valley portion 11 and the side surface taper angle on the outer surface side of the valley portion 15 are substantially matched. By doing in this way, the crests of the inner member 3 and the outer member 5 and troughs can mutually fit.

In the present invention, in order to fit the ridges and valleys of the inner member 3 and the outer member 5 to each other, the shapes of the ridges and valleys are as shown in FIGS. 8 (a) to 8 (c). It is not restricted to the example shown in. 8A to 8C do not have a taper but can be rectangular.

(Second Embodiment)
Fig.9 (a) is a fragmentary sectional view of the peak part 9 and the trough part 11 of the outer member 5 concerning 2nd Embodiment, FIG.9 (b) is the inner member 3 concerning 2nd Embodiment. 3 is a partial cross-sectional view of a mountain portion 13 and a valley portion 15. FIG. In the example shown in FIG. 9A, the side taper angles of the crest 9 and the trough 11 are opposite to those in FIG. 6A to FIG. 6C. That is, the opening of the valley portion 11 is configured to gradually narrow from the bottom surface toward the mountain portion 9. Further, the width of the top portion of the peak portion 9 is formed so as to be gradually wider than the base portion of the peak portion 9. For example, as shown in FIG. 9A, the opening width I on the inner surface base portion side of the peak portion 9 is narrower than the maximum width H of the inner surface of the peak portion 9 facing this.

Similarly, in the example illustrated in FIG. 9B, the base width K of the mountain portion 13 is narrower than the maximum width J of the mountain portion 13. Therefore, the opening width of the valley portion 15 is also narrower than the maximum width of the valley portion 15.

FIG. 9C is a diagram showing a state in which these ridges and valleys are fitted together. In this case, in the fully fitted state, the peak 13 is fitted to the inner surface of the peak 9, and the inner surface of the valley 15 is fitted to the valley 11. Here, when fitting the crest 13 and the trough 15 of the inner member 3 with the crest 9 and the trough 11 of the outer member 5, the opening width of the crest or trough is expanded (or crushed). ) Press fit. For this reason, when it is going to pull away the peak part of the inner member press-fitted from the peak part of an outer member, the peak part outer surface of an inner member is pressed with respect to the peak part outer surface of an inner member from the peak part inner side of an outer member. In addition to the fact that the pressing force is applied, since the base width K of the crest of the outer member is narrower than the maximum width J of the crest of the inner member, the crest of the inner member is replaced with the crest of the outer member. It is possible to hold the state in which the crests of the outer member and the inner member are fitted to each other more stably.

In addition, in FIG.9 (b), although the shape of the peak part 13 showed the example comprised by the curve, this invention is not limited to this. For example, as shown in FIG.9 (d), the shape which has a linear part may be sufficient. Even in this case, the width N of the base portion of the peak portion 13 is narrower than the maximum width M. Therefore, the fitting state can be held more stably.

In addition, when forming a linear part, it is desirable that the width | variety M of the top part of the peak part 13 is narrower than the opening width I of the inner surface of the peak part 9 to be fitted. By doing in this way, peak parts can be pressed in more easily. In the example configured with the curved portion, the straight portion width is zero.

(Third embodiment)
FIG. 10 is a plan view of the corrugated tube 1a. The corrugated tube 1a has substantially the same configuration as the corrugated tube 1, but differs in that a fitting portion 42 is provided in the overlapping portion of the inner member 3 and the outer member 5.

FIG. 11 (a) is a cross-sectional view taken along the line QQ in FIG. 10, and FIG. 11 (b) is an enlarged view of a portion R in FIG. 11 (a). A protrusion 44 is provided on the outer surface of the extending portion 27 of the inner member 3. Further, a hole 47 is provided in the extending portion 27 of the outer member 5. The protrusion 44 and the hole 47 can be fitted.

When the corrugated pipe 1a is completely closed, the position of the protrusion 44 provided in the extending portion 27 of the inner member 3 and the position of the hole 47 provided in the extending portion 27 of the outer member 5 coincide. Accordingly, the protrusion 44 is fitted into the hole 47. For this reason, the state which the inner side member 3 and the outer side member 5 closed can be hold | maintained more stably.

In addition, the aspect of the fitting part 42 is not restricted to the illustrated example, The hole 47 and the protrusion 44 may not be sufficient. Moreover, the hole 47 may be provided in the extended portion 27 of the inner member 3, and the protrusion 44 may be provided on the inner surface of the extended portion 27 of the outer member 5.

According to this embodiment, the same effect as that of the first embodiment can be obtained. Further, by providing the extending portions 23 and 27 with the fitting portions 42 that can be fitted to each other, the corrugated pipe 1d can be held in a closed state.

(Fourth embodiment)
Next, a fourth embodiment will be described. FIG. 12 is a bottom view of the corrugated pipe 1b (viewed from the hinge part 7 side). The corrugated tube 1b has substantially the same configuration as the corrugated tube 1, but differs in that a slit 36 is provided in the hinge portion 7. In the corrugated tube 1, the hinge portion 7 has no peaks and valleys. For this reason, when the corrugated tube 1 is bent, the hinge portion 7 is expanded in the circumferential direction or reduced in diameter in comparison with the inner member 3 and the outer member 5 to open the tube or close the tube. However, the flexibility in the tube axis direction is inferior. For this reason, when the corrugated pipe 1 is bent in the pipe axis direction, the corrugated pipe 1 as a whole may not have sufficient flexibility.

In the corrugated pipe 1b, slits 36 are formed in the direction of formation of the peaks and valleys (circumferential direction). The slits 36 are formed in a plurality of periods at the same intervals as the crests or troughs with respect to the tube axis direction. For example, the slit 36 is formed in accordance with the positions of the valley portions of the inner member 3 and the outer member 5.

Thus, by forming the slits 36 in the hinge portion 7 at a predetermined interval, the slits 36 can be deformed when the corrugated tube 1b is bent. For this reason, the flexibility at the time of bending to the pipe-axis direction of the hinge part 7 improves.

It should be noted that the arrangement and shape of the slits 36 are not limited to the example shown in the drawings, and may be other forms as long as they can follow the bending deformation in the tube axis direction. For example, the formation interval of the slits 36 may be changed from the interval between the peaks or valleys, and may be formed at the position of the peaks instead of the valleys. Further, instead of the slit 36, a simple cut may be used. By forming the slit 36, not only bending deformation in the tube axis direction but also when the hinge portion 7 is bent and deformed, the rigidity of the hinge portion is reduced, so the inner member can be easily fitted to the outer member. Become.

According to the fourth embodiment, the same effects as those of the first embodiment can be obtained. Further, by forming the slit 36 in the hinge part 7, the flexibility of the hinge part 7 can be enhanced. For this reason, the flexibility of the corrugated pipe 1b can be improved.

(Fifth embodiment)
Next, a fifth embodiment will be described. FIG. 13A is a bottom view of the corrugated tube 1b (viewed from the hinge portion 7 side). The corrugated pipe 1c has substantially the same configuration as that of the corrugated pipe 1, but is different in that an uneven part 37 is provided on the hinge part 7.

FIG. 13 (b) is a cross-sectional view taken along the line PP in the O portion of FIG. 13 (a). As shown in the figure, the hinge portion 7 is provided with an uneven portion 37. The concavo-convex portion 37 is composed of a plurality of concave portions and convex portions. In addition, the uneven part 37 is formed on both surfaces of the hinge part 7. That is, it is desirable that the thickness of the hinge portion 7 is substantially constant, and the cross section of the hinge portion 7 has a waveform.

Thus, by forming the uneven portion 37 in the hinge portion 7, when the corrugated tube 1c is bent, the flexibility of the hinge portion 7 is improved by the deformation of the uneven portion 37.

In addition, the uneven | corrugated | grooved part 37 does not necessarily need to be provided with a recessed part and a convex part, and may be only a recessed part or only a convex part. In the illustrated example, a plurality of concave portions and convex portions are formed repeatedly in the tube axis direction and the circumferential direction of the tube, but the size, position, and shape of the concave portions and convex portions are limited to the illustrated example. I can't.

According to this embodiment, the same effect as that of the first embodiment can be obtained. By forming the concavo-convex part 37 in the hinge part 7, the flexibility when the hinge part 7 is bent in the tube axis direction can be enhanced. For this reason, the flexibility of the corrugated pipe 1b can be improved.

Here, the case where the hinge portion 7 is provided with a slit or a plurality of concave portions and convex portions is described, but the shape of the hinge portion 7 is a wave shape, a plurality of wave shapes (Ω shape), a dot shape, etc. If the portion 7 can be bent and the extending portions 23 and 27 of the inner member 3 and the outer member 5 can be brought close to each other or away from each other, it is not necessary to restrict the shape.

(Second corrugated tube)
(Sixth embodiment)
Next, the detail of the corrugated pipe | tube 2 which is a corrugated pipe | tube with a rib is demonstrated. FIG. 14 is a perspective view showing the corrugated pipe 1, and FIG. 15 is a front view seen from the pipe axis direction. FIG. 16 is a front view showing the corrugated tube 2 with the corrugated tube 2 closed. Similar to the corrugated tube 1, the corrugated tube 2 includes an inner member 43, an outer member 45, a hinge portion 39, and the like.

The inner member 43 of the corrugated pipe 2 has a plurality of crests 35 and troughs 32 extending in the circumferential direction alternately formed at predetermined intervals in the pipe axis direction. Similarly, in the outer member 45, a plurality of crest portions 38 and trough portions 34 extending in the circumferential direction are alternately formed at predetermined intervals in the tube axis direction. The inner member 43 and the outer member 45 are connected by a hinge portion 39. Here, the formation interval of the crests 38 or troughs 34 of the outer member 45 in the tube axis direction is equal to the formation interval of the crests 35 or troughs 32 of the inner member 43. Moreover, the formation interval of the peak part or trough part of the corrugated pipe 2 and the formation interval of the peak part or trough part of the corrugated pipe 1 are equal.

Here, when the corrugated pipe 2 is wrapped around the outer periphery of the corrugated pipe 1 and fitted, the inner surface width of the peak portion 38 of the outer member 45 of the corrugated pipe 2 (outer pipe) is the same as that of the corrugated pipe 1 (inner pipe). It is desirable to make the width wider than the outer surface width of the peak portion 9 of the outer member 5. Similarly, it is desirable that the peak portion 35 of the inner member 43 of the corrugated pipe 2 is wider than the peak portion 13 of the inner member 3 of the corrugated pipe 1. Further, the opening width of the valley portion 15 of the inner member 3 of the corrugated tube 1 is desirably wider than the inner surface protrusion width of the valley portion 32 of the inner member 43 of the corrugated tube 2. Similarly, it is desirable that the valley portion 11 of the outer member 5 of the corrugated tube 1 is wider than the valley portion 34 of the outer member 45 of the corrugated tube 2.

By doing in this way, the peak parts of corrugated pipes 1 and 2 and trough parts fit. It is desirable that the side taper angle on the inner surface side of the crest (or valley) of the outer tube and the side taper angle on the outer surface side of the crest (or trough) of the inner tube are substantially matched. By doing in this way, peak parts and trough parts can fit each other more reliably.

As described above, the corrugated tube 2 is formed with a plurality of linear rib portions 4 that extend in the tube axis direction with a predetermined distance in the circumferential direction. The rib part 4 is a site | part in which a peak part or a trough part is not formed.

As shown in FIG. 16, it is desirable that the rib portions 4 that are separated in the circumferential direction are disposed at substantially the target or symmetrical positions with respect to the center line. By doing in this way, arrangement | positioning of the corrugated part 6 also becomes a substantially object or symmetrical arrangement | positioning. As described above, the corrugated portion 6 is a portion that fits with another corrugated pipe 1. For this reason, by arrange | positioning the corrugated part 6 equally in the circumferential direction, it can be made to fit with the corrugated pipe | tube 1 in the position equivalent to the circumferential direction.

Here, at one end portion (for example, the inner member 43) of the opening portion of the corrugated tube 2, the rib portion 4 and the corrugated portion 6 are formed adjacent to each other in this order from the end portion. That is, the rib part 4 is formed in one edge part. In the other end portion (for example, the outer member 45) of the opening portion of the corrugated tube 2, the corrugated portion 6 and the rib portion 4 are formed adjacent to each other sequentially from the end portion. That is, the corrugated portion 6 is formed at the other end.

The method of using the corrugated tube 2 is the same as the method of using the corrugated tube 1. That is, the outer member 45 is overlapped on the outer side of the inner member 43, and the peaks and valleys are fitted to each other. That is, the corrugated portions 6 of the inner member 43 and the outer member 45 are fitted together.

In the illustrated example, the corrugated portion 6 at the end of the outer member 45 is fitted with the corrugated portion 6 adjacent to the rib portion 4 at the end of the inner member 43. The rib portions 4 of the outer member 45 and the inner member 43 are formed at positions corresponding to each other. Therefore, when the outer member 45 and the inner member 43 are overlapped, the rib portions 4 overlap each other in the overlapping portion.

In this way, the corrugated portion 6 is fitted to the corrugated portion 6 adjacent to the rib portion 4 so that the corrugated portion 6 at one end is moved over the rib portion 4 at the other end portion. Is locked by the rib portion 4. Therefore, the fitting between the corrugated portions 6 is difficult to come off in the circumferential direction.

The corrugated tube 2 has a cross-sectional shape corresponding to the corrugated tube 1. That is, the corrugated tube 2 has a shape that is slightly larger than the corrugated tube 1 so that the corrugated tube 2 can be put on the outer periphery of the corrugated tube 1, and the curved portion 17, the straight portion 25, the curved portion 18, and the straight line of the corrugated tube 1. It has a shape corresponding to the part 19 and the curved part 21. In addition, since the detail of each part shape of the corrugated pipe | tube 2 is the same as that of the corrugated pipe | tube 1, the overlapping description is abbreviate | omitted.

In addition, if the cross-sectional shape of the corrugated tube 1 is another shape, the shape of the corrugated tube 2 may be changed corresponding to the corrugated tube 1. Further, when the corrugated tube 2 is used as an inner tube, the corrugated tube 2 may have a shape in which the corrugated tube 1 is slightly reduced. When the corrugated tube 2 is an inner tube, the outer surface of the rib portion 4 is preferably the same height as the bottom surface of the outer surface of the valley portion. By doing in this way, it can prevent that the rib part 4 interferes with the peak part or trough part of an outer tube | pipe.

(Laying the piping structure)
Next, the laying state of the piping structure 10 according to the present invention will be described. FIG. 17 is a diagram illustrating an example of a state in which the piping structure 10 is laid.

The piping structure 10 is formed with a straight portion 49 and a bent portion 51 according to the installation location. The corrugated tube 1 is excellent in flexibility because a continuous valley shape in the circumferential direction is repeated at a predetermined formation interval in the tube axis direction. Therefore, it can be bent easily. On the other hand, the corrugated tube 2 is formed with rib portions 4 that do not have a mountain-valley shape in the tube axis direction. For this reason, since the flexibility of the rib part 4 is low, the flexibility of the corrugated pipe 2 as a whole is low. That is, the linear shape retainability is high.

For this reason, only the corrugated pipe 1 is disposed in the bent portion 51 in the laying state of the piping structure. In addition, the corrugated tube 2 is disposed in the straight portion 49. By doing in this way, while the bent part 51 can be formed easily, it can suppress that the linear part 49 bends by dead weight etc. FIG.

As described above, according to the piping structure 10 of the present embodiment, the bent portion 51, the straight line can be obtained by connecting and combining the corrugated pipe 1 excellent in flexibility and the corrugated pipe 2 excellent in linear shape retention. A pipe laying structure suitable for each of the portions 49 can be obtained. In particular, by arranging the corrugated tube 2 in the straight portion 49, it is possible to suppress the straight portion 49 from being deformed due to the bending of the corrugated tube or the like, and the appearance is excellent.

Moreover, the corrugated pipes 1 and 2 can be reliably connected by fitting the peaks and valleys at the ends of the corrugated pipes 1 and 2 together. Further, the fitting is not released and the corrugated tube 1 is not pulled out.

Further, since the inner member 43 and the outer member 45 of the corrugated pipe 2 are performed by the corrugated portions 6, the inner member 43 and the outer member 45 are not easily disengaged.

Further, by arranging the rib portion 4 in line symmetry or point symmetry with respect to the center of the corrugated tube 2, the fitting portion with the corrugated tube 1 can be disposed in a balanced manner in the circumferential direction.

In addition, since the height of the rib portion 4 is not lower than the peak portion, the inner diameter of the peak portion inner surface is not reduced, and the outer surface of the peak portion of the corrugated tube 1 and the inner surface of the rib portion 4 interfere when connected to the corrugated tube 1. There is nothing to do.

In addition, by arranging the corrugated tube 1 in the bent portion 51, the bent portion 51 can be easily formed. In addition, by arranging the corrugated tube 2 in the straight portion 49, it is possible to suppress bending of the straight portion.

Also, if both the corrugated pipes 1 and 2 satisfy the relationship of A> B> 2C described above, the wire insertion work is easy and the holding force when closed is increased. In addition, the overlapping portion does not become too large, and it is easy to fit each other. That is, it is excellent in the insertion workability of the electric wire, the operation of closing the opening is easy, and the holding force when closed can be sufficiently secured.

(Seventh embodiment)
Next, a seventh embodiment will be described. FIG. 18 is a plan view showing the corrugated tube 2a. In addition, in the following description, the description which overlaps about the structure which show | plays the function similar to the corrugated pipe 2 shown in FIG. 14 is abbreviate | omitted.

The corrugated tube 2a has substantially the same configuration as the corrugated tube 2, but differs in that the diameter is not constant. In the corrugated tube 2a, a large diameter portion 55 having a relatively large outer diameter (inner diameter) and a small diameter portion 53 having a relatively small outer diameter (inner diameter) are alternately formed.

The difference in diameter between the small diameter portion 53 and the large diameter portion 55 is about twice the thickness of the corrugated tube 2a. The number of repetitions and the length of the small diameter part 53 and the large diameter part 55 are not limited to the illustrated example. Moreover, although the illustrated example shows an example in which one end portion is the small diameter portion 53 and the other end portion is the large diameter portion 55, the present invention is not limited thereto.

FIG. 19A is a cross-sectional view taken along the line UU in FIG. 18, and FIG. 19B is a cross-sectional view taken along the line VV in FIG. As shown in FIG. 19A, in the corrugated portion 6, the large diameter portion 55 has a larger outer diameter and inner diameter in both the peak portion and the valley portion than the small diameter portion 53. As shown in FIG. 19B, also in the rib portion 4, the large diameter portion 55 has a larger outer diameter and inner diameter than the small diameter portion 53.

FIG. 20A is a diagram showing a state in which the corrugated pipes 2a are connected to each other. As described above, one end portion of the corrugated pipe 2 a is the small diameter portion 53, and the other end portion is the large diameter portion 55. The small diameter part 53 of the corrugated pipe 2a can be fitted to the large diameter part 55 of another corrugated pipe 2a. That is, the large diameter portion 55 can be put on the outer periphery of the small diameter portion 53.

FIG. 20B is a cross-sectional view of the fitting portion. The large diameter part 55 of one corrugated pipe 2a and the peak parts and valley parts of the small diameter part 53 of the other corrugated pipe 2a are fitted together. Here, the crest inner surface width of the large diameter portion 55 is wider than the crest outer surface width of the small diameter portion 53, and is wider than the trough inner surface protrusion width of the large diameter portion 55 than the trough outer surface width of the small diameter portion 53. By doing so, as mentioned above, it can be made to fit more reliably. In addition, by matching the taper angles of the side surfaces of the crests (valleys) of the small diameter part 53 and the large diameter part 55, the crests and troughs can be reliably fitted.

According to the seventh embodiment, the same effect as that of the sixth embodiment can be obtained. Moreover, the same corrugated pipe | tube 2a can be connected. For this reason, it is not necessary to manufacture a corrugated pipe | tube by predetermined length beforehand by changing the number of connection according to the length of the linear part 49. FIG.

The corrugated tube 1 may also have a small diameter portion and a large diameter portion. In this case, both the corrugated tubes 1 and 2 can be an outer tube or an inner tube.

(Eighth embodiment)
Next, an eighth embodiment will be described. FIG. 21 is a front view of the corrugated pipe 1d in an open state as seen from the pipe axis direction. The corrugated tube 1d has substantially the same configuration as that of the corrugated tube 1, but the shapes of the inner member 3, the outer member 5, and the hinge portion 7 are different.

The hinge portion 7 of the corrugated tube 1d is not shaped like the waveform as described above, but is shaped such that the end of the inner member 3 and the end of the outer member 5 are directly joined. Thus, in the present invention, a portion that can be bent because the inner member 3 and the outer member 5 open and close each other is defined as a hinge portion. The hinge portion 7 may have any shape as long as the inner member 3 and the outer member 5 can perform a flattening operation.

Further, the inner member 3 has a straight portion 26 formed between the hinge portion 7 and the curved portion 17. Thus, in this invention, the hinge part 7 and the curve part 17 do not need to be joined directly, and both the inner member 3 and the outer member 5 should just comprise a curve part and a linear part. That is, the inner member 3 is composed of a linear portion 26, a curved portion 17, and a linear portion 25 as an extending portion 27 in order from the hinge portion 7 side with respect to the outer member 5 with the hinge portion interposed therebetween. The outer member also includes a curved portion 18, a linear portion 19 as an extending portion, and a curved portion 21 in order from the hinge portion 7 side.

As for the corrugated pipe 1 d, similarly to the corrugated pipe 1, the curvature radius C of the curved portion 17 of the inner member 3, the curvature radius D of the curved portion 18 of the outer member 5, and the curvature radius E of the curved portion 21. The curvature radii C, D, and E of the curved portions are preferably substantially the same.

Further, the corrugated pipe 1d also has an opening dimension (A in the drawing) between the end of the extending portion 27 of the inner member and the hinge portion 7 before the inner member 3 and the outer member 5 are closed. It is larger than the opening dimension (B in the drawing) between the end of the extended portion 23 (curved portion 21) of the member 5 and the hinge portion 7. Moreover, the opening dimension (B in the figure) between the extended portion 23 end of the outer member 5 and the hinge part 7 is larger than twice the radius of curvature (C in the figure) of the curved portion 17 of the inner member 3. That is,
A>B> 2C
Satisfy the relationship.

By doing in this way, as described above, when the tube is closed, the overlapping portions of each other can be reliably fitted, and the shape of the closed tube can be a flat tube shape.

According to the eighth embodiment, the same effect as when the corrugated tube 1 is used can be obtained. That is, it can be used in connection with the corrugated tube 2 or the like. In addition, by forming the straight portion 26 between the hinge portion 7 and the curved portion 17, it is possible to improve the storage property of the cable inside the corrugated tube and the attachability of the corrugated tube, and sandwich the hinge portion 7. Compared with the case where the curved portions of the inner member 3 and the outer member 5 are directly opposed to each other, the bending stress generated when the extending portion is overlapped and the tube is closed is not limited to the hinge portion 7 but the boundary between the straight portion and the curved portion. Therefore, the bending stress applied to the hinge portion can be reduced, and the closed state of the tube can be stably maintained.

(Ninth embodiment)
Next, a ninth embodiment will be described. 22A is a front view showing the corrugated pipe 1e in an opened state as seen from the pipe axis direction, and FIG. 22B is a front view showing the corrugated pipe 1e in a closed state as seen from the pipe axis direction. . The corrugated tube 1e is different in that it does not have the hinge portion 7.

The corrugated pipe 1e includes an inner member 3a and an outer member 5a. As with the inner member 3 and the outer member 5, the inner member 3a and the outer member 5a are each formed with a plurality of crests and troughs extending in the circumferential direction alternately at predetermined intervals in the tube axis direction. The inner member 3 and the outer member 5 are substantially C-shaped members that are partially cut off in the circumferential direction. Note that the circumferential length of the cut portion is less than ½ of the circumferential length (in the case of a circle).

The inner member 3a has a slightly smaller outer diameter than the outer member 5a. Specifically, the outer diameter of the crest of the inner member 3a is slightly smaller than the inner diameter of the inner surface of the crest of the outer member 5a, and the outer diameter of the trough of the inner member 3a is smaller than that of the trough of the outer member 5a. Slightly smaller than the inner diameter of the inner surface. The inner member 3a is held inside the outer member 5a by fitting the inner member 3a inside the outer member 5a and fitting the ridges and valleys of each other.

As shown in FIG. 22A, an opening is formed in a part of the corrugated tube 1b in the circumferential direction by matching the positions of the cut portions of the inner member 3a and the outer member 5a. On the other hand, by closing the inner member 3a in the circumferential direction with respect to the outer member 5a (W in the figure), a closed tube as shown in FIG. 22B can be obtained. Since the circumferential length of the cut portion is less than ½ of the circumferential length (when it is a circle), the inner member 3a does not fall off the outer member 5a when closed.

According to the ninth embodiment, the same effect as when the corrugated tube 1 is used can be obtained. That is, it can be used in connection with the corrugated tube 2 or the like. Moreover, the obstruct | occluded corrugated pipe | tube can be obtained easily by rotating the inner side member 3a and the outer side member 5a mutually in the circumferential direction, and making it slide. In addition, the inner member 3a and the outer member 5a can stop rotation of the inner member 3a and the outer member 5a of the closed corrugated pipe 1b by providing protrusions protruding inward at predetermined positions.

(Tenth embodiment)
Next, a tenth embodiment will be described. FIG. 23 is a front view showing the corrugated tube 1c in an open state as viewed from the tube axis direction, and corresponds to FIG.

As shown in FIG. 7 of Patent Document 1, the corrugated tube 1f has the same diameter D1 between the inner member 3b and the outer member 5b, and is connected by the hinge portion 7. The outer member 5b has an opening B1 smaller than the diameter D1 so that the outer member 5b rotates at the hinge portion 7 and engages with the inner member 3b. The opening A1 of the inner member 3b is smaller than the opening B1 formed in the outer member 5b, and the inner member 3b and the outer member 5b are arranged asymmetrically with respect to the line Y passing through the hinge portion 7. Here, in the corrugated tube 1f in FIG. 23, the size relationship of the opening dimensions of the inner member 3b and the outer member 5b is reversed compared to the case of the corrugated tube 1 in FIG. The opening B1 of the outer member 5b is gradually enlarged when the hinge part 7 is rotated and the outer member 5b is put on the inner member 3b, and then the opening dimension is gradually expanded to a dimension equal to the diameter D1 of the inner member. The size is reduced and the fitting of the inner member 3b and the outer member 5b is completed.

As an example, for an annular tube having a diameter D1 of 23 mm, the distance X1 from the line Y to the edge 58a of the outer member 5b is 9 mm, and the distance Y2 from the line Y to the edge 58b of the inner member 3b is 2.5 mm. It is.

Thus, according to the fifth embodiment, the same effect as when the corrugated tube 1 is used can be obtained. That is, it can be used in connection with the corrugated tube 2 or the like.

(Production method)
Next, the manufacturing method of the corrugated pipe | tube 1 and the corrugated pipe | tube 2 concerning this invention is demonstrated. Here, since the corrugated pipe 1 and the corrugated pipe 2 can be manufactured by the same method, only the manufacturing method of the corrugated pipe 1 will be described.

FIG. 24 is a diagram showing the pipe material manufacturing apparatus 60. The pipe material manufacturing apparatus 60 mainly includes an extruder 65, endless tracks 63a and 63b, and the like.

First, the resin is extruded into a cylindrical shape from the extruder 65, and the cylindrical material 67 is sent to the lower process side (in the direction of arrow U in the figure) of the tube material manufacturing apparatus 60. The cylindrical material 67 is sandwiched between a pair of endless tracks 63a and 63b. The endless tracks 63a and 63b rotate in opposite directions, S direction and T direction, respectively. The endless tracks 63a and 63b are composed of a plurality of molds 61 and the like.

The endless tracks 63a and 63b have molding portions 69 that move in the same direction and at the same speed with respect to the feeding direction of the pipe material manufacturing apparatus 60 and face each other. In the molding unit 69, the mold 61 and the like move in the feeding direction at the same speed in synchronization with the feeding speed of the cylindrical material 67. In the molding part 69, the molds 61 of the endless tracks 63a and 63b face each other and come into close contact with each other.

The mold 61 is a half-divided half-cylinder member in which irregularities and the like corresponding to the outer shape of the corrugated tube material 71 are formed on the inner surface. The pair of molds 61 face each other to form a cylindrical member, and a crest and a trough corresponding to the outer shape of the corrugated tube material 71 are formed on the inner surface.

FIG. 25 is a front view of the corrugated tube material 71. The corrugated tube material 71 includes the inner member 3, the outer member 5, and the hinge portion 7 of the corrugated tube 1. Further, the ends of the extending portions 23 and 27 are not separated and are connected by the connecting portion 73. That is, the corrugated tube material 71 is a tubular member as a whole that does not have an opening along the longitudinal direction.

That is, the corrugated tube material 71 has a substantially oval cross section that is asymmetric with respect to the hinge portion 7. Here, an ellipse portion (maximum outer diameter portion) of the corrugated tube material 71 is defined as a major axis, and the major axis passing through the hinge 7 is divided into two equal parts, and a straight line perpendicular to the major axis is defined as a minor axis. In this case, each of the pair of molds 61 formed so as to include the mold 61 of the inner member 3 or the outer member 5 with respect to the dividing line, with the minor axis as the dividing line described above, Are connected to each other to form endless tracks 63a and 63b. The molding part 69 is a part of each loop and is a part where the pair of molds 61 are opposed to each other.

The cylindrical material 67 is supplied by extrusion molding into a pair of molds 61 that are combined to face each other, and the mold 61 is repeated while the transfer speed of the mold 61 is synchronized with the extrusion speed of the cylindrical material 67. To transport. That is, the cylindrical material 67 is sent to the cylindrical space formed by the mold 61.

The mold 61 is provided with a plurality of holes and sucks the air inside from the outside. Since the air between the mold 61 and the cylindrical material 67 is sucked to the outside of the mold 61, the cylindrical material 67 is pressed against the inner surface of the mold 61. Therefore, the cylindrical material 67 is formed into a shape corresponding to the inner surface shape of the mold 61. Further, the formed corrugated tube material 71 is sent from the endless tracks 63a and 63b to a cooling unit, a winding unit, and the like, which are not shown, on the rear side. In this way, the corrugated tube material 71 is manufactured.

As shown in FIG. 25, the corrugated tube 1 can be manufactured by cutting the connection portion of the corrugated tube material 71 with the cutting portions V and W. At this time, since the connection portion 73 can be designed to be minimized, there is little waste. In this case, the shape of the hinge part is slightly changed, and the end part of the extended part of the outer member is further rotated to the left side of the end part of the extended part of the inner member, thereby cutting the cut parts V and W. Can be made to coincide with each other so that one cut portion can be provided.

Further, when the connecting portion 73 is cut, the tapered portions 31 and 33 shown in FIGS. 6A to 6C can be formed. In the example shown in FIG. 25, the taper part 31 can also be formed simultaneously with the cutting by cutting the cutting part V at an angle that becomes a tapered shape. Note that a taper shape may be formed on the cutting portion W side at the time of cutting.

The embodiment of the present invention has been described above with reference to the accompanying drawings, but the technical scope of the present invention is not affected by the above-described embodiment. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

1, 1a, 1b, 1c, 1d, 1e, 1f, 2, 2a ... corrugated tube 3, 3a, 3b, 43 ......... inner member 4 ... rib portions 5, 5a, 5b, 45 ......... Outer member 6... Corrugated portion 7, 39... Hinge portion 9, 13, 35, 38 ...... Mountain portion 10 ...... Piping structure 11, 15, 32, 34 ...... Valley portion 17, 18, 21 ......... Curve portions 19, 25, 26 ......... Linear portions 23, 27 ......... Extension portions 29 ......... Electric wires 31, 33 ......... Taper portions 36 ......... Slits 37 ......... Uneven portions 42 ......... Fitting part 44 ......... Protrusion 47 ......... Hole 49 ......... Linear part 51 ......... Bent part 53 ......... Small diameter part 55 ......... Large diameter parts 58a, 58b ......... Edge 60 ... …… Pipe material manufacturing device 61 ......... Mold 63a, 63b ......... Endless track 65 ... ... Extruder 67 ... ... Tubular material 69 ... ... Molding section 1 ......... corrugated pipe material 73 ......... connection part

Claims (13)

1. The first corrugated pipe and the second corrugated pipe are connected,
   The first corrugated tube is
   An inner member and an outer member;
   In the inner member, a plurality of crests and troughs extending in the circumferential direction are alternately formed at predetermined intervals in the tube axis direction,
   In the outer member, a plurality of crests and troughs extending in the circumferential direction are alternately formed at predetermined intervals in the tube axis direction,
   The second corrugated pipe is
   A cross-sectional shape corresponding to the cross-sectional shape of the first corrugated tube, a portion of the second corrugated tube in the circumferential direction having an opening continuous in the tube axis direction, and an outer peripheral tube of the second corrugated tube A corrugated portion in which crests and troughs are alternately formed in the axial direction, and a plurality of linear rib portions extending in the tube axial direction at a predetermined distance in the circumferential direction of the second corrugated tube, In the circumferential direction of the second corrugated pipe, the corrugated portions and the rib portions are alternately formed,
   One of the first corrugated tube and the second corrugated tube is an inner tube, the other is an outer tube, and an end portion of the outer tube is covered with an end portion of the inner tube.
2. The first corrugated tube is
   A hinge portion for opening or fitting the inner member and the outer member;
   In the tube vertical cross section of the inner member, an extending portion is formed on the tube opening side, and the inner member includes a curved portion and a straight portion,
   In the tube vertical cross section of the outer member, an extending portion is formed on the tube opening side, and the outer member includes a curved portion and a straight portion,
   2. The piping structure according to claim 1, wherein the extending portion of each of the inner member and the outer member is overlapped by bending the hinge portion, and the cross section becomes a closed tube.
3. The piping according to claim 1, wherein a crest portion of the outer pipe and a crest portion of the inner pipe are fitted, and a trough portion of the outer pipe and a trough portion of the inner pipe are fitted. Construction.
4. At one end of the opening of the second corrugated tube, the rib and the corrugated adjacent to the rib are formed in order from one end of the opening,
   At the other end of the opening of the second corrugated tube, the corrugated portion and the rib portion adjacent to the corrugated portion are formed in order from the other end of the opening,
   The piping structure according to claim 1, wherein both end portions of the opening of the second corrugated pipe are overlapped with each other and the corrugated portions of the both end portions are fitted to each other.
5. The rib part formed so as to cross a part of the corrugated part at a predetermined distance in the circumferential direction of the second corrugated pipe is formed to be equal to or higher than the peak part of the corrugated part. The piping structure according to claim 1, wherein the piping structure is formed to have the same height as or lower than the valley of the corrugated portion.
6. At least one of the first corrugated tube and the second corrugated tube has a small-diameter portion and a large-diameter portion alternately formed in the tube axis direction, and the large-diameter portion is fitted to the small-diameter portion, The piping structure according to claim 1, wherein the corrugated pipes or the second corrugated pipes are connected in the pipe axis direction.
7. In at least one of the first corrugated tube and the second corrugated tube, one end is the small diameter portion, the other end is the large diameter portion, and the large diameter portion covers the small diameter portion. The piping structure according to claim 6, wherein the plurality of first corrugated pipes or the plurality of second corrugated pipes are connected in the axial direction.
8. The piping structure has a straight part and a bent part in a part of the pipe axis direction,
   The piping structure according to claim 1, wherein the bent portion includes only the first corrugated pipe.
9. The piping structure according to claim 1, wherein an electric wire is arranged inside the piping structure.
10. The first corrugated tube is
    An opening between the end of the extended portion of the inner member and the hinge portion in a vertical cross section of the tube in a state before fitting the extended portions of the inner member and the outer member. The dimension is larger than the opening dimension between the end part of the extension part of the outer member and the hinge part, and the opening dimension between the end part of the extension part of the outer member and the hinge part is larger. The piping structure according to claim 2, wherein the piping structure is larger than twice the radius of curvature of the curved portion of the inner member.
11. A corrugated portion having an opening continuous in the tube axis direction in a part of the circumferential direction, and having crests and valleys formed alternately in the tube axis direction on the outer periphery of the tube, and a predetermined distance in the circumferential direction of the tube And a plurality of linear rib portions extending in the tube axis direction so as to cross a part of the corrugated portion, and the corrugated portions and the rib portions are alternately formed in the circumferential direction of the corrugated tube Corrugated tube with ribs characterized by being made.
12. Small-diameter portions and large-diameter portions are alternately formed in the tube axis direction of the corrugated tube with ribs, the large-diameter portions are fitted into the small-diameter portion, and the corrugated tubes with ribs are connected in the tube axis direction. The ribbed corrugated pipe according to claim 11, wherein the corrugated pipe has a rib.
13. One end of the corrugated pipe with ribs in the tube axis direction is the small diameter portion, the other end is the large diameter portion, the large diameter portion is covered with the small diameter portion, and a plurality of the ribs are attached. The corrugated pipe with ribs according to claim 12, wherein the corrugated pipes are connected in the axial direction.
    

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