JP2010252618A - Cable protection pipe, piping structure thereof, cable laying method, and method for manufacturing the cable protection pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cable protection pipe which enables cables housed in the protection pipe to be easily taken out without using a special tool, has a simple configuration and is excellent in workability. <P>SOLUTION: The protection pipe 1 is corrugated and elastic, has high parts 5 and low parts 7 are alternately formed along an axial direction on the outer circumference. A protruding part 3 protruding to the outer circumference of the protection pipe 1 at predetermined intervals is formed in the axial direction of the protection pipe 1. The protruding part 3 is formed of a pair of protrusions 3a, 3b. The protrusions 3a, 3b protrude outward from the high parts 5 of the protection pipe 1, and are arranged side by side in substantially parallel along the axial direction. The outer diameter of an imaginary circle (inner circumferential circle 13 of the apex of the protrusion) across the inner surface position of the apices of the protrusions 3a, 3b is larger than the diameter of the maximum outer circumferential circle (i.e., the outer diameter of the apex of the high part 5) in a part other than the protrusions 3a, 3b of the protection pipe 1. Accordingly, the protrusions 3a, 3b protrude from at least the outer circumferential circle of the high parts 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a flexible cable protection tube through which a cable or the like is passed, a piping structure thereof, a cable laying method using the same, and a method of manufacturing a cable protection tube.

  Conventionally, as a protective tube for a cable such as an electric wire, a flexible resinous corrugated tube or a steel tube is used. However, when a conventional protective tube is used, it is necessary to use a relay box or the like installed at each cable extraction position and capable of extracting the internal cable at a portion where the internal cable is extracted to the outside of the protective tube, or It is necessary to make a hole for taking out the cable in the protective tube itself. However, using a relay box requires construction man-hours and costs. Moreover, it is extremely difficult to provide a hole in the protective tube without damaging the internal cable each time, and the workability is also poor.

  As such a protective tube that can accommodate or take out a cable such as an electric wire, for example, a slit portion that is continuously cut from one side in the longitudinal direction to the other end is provided on one side in the radial direction. In addition, there is a protective tube in which a notch hole is continuously provided from one side in the longitudinal direction to the other end on the other end side in the radial direction (Patent Document 1).

  There is also a cable takeout tool for taking out the cable in the flexible tube. (Patent Document 2).

JP 2002-165327 A JP-A-9-322346

  However, when used in a protective tube such as that disclosed in Patent Document 1, it is necessary to prevent water from entering from the cutting portion, and the protective tube may be crushed by an external force or the cutting portion may be opened. .

  In addition, if a special tool such as Patent Document 2 is required, the workability is deteriorated, and a vertical slit is necessary in the flexible tube. There is a fear.

  The present invention has been made in view of such a problem, and the cable accommodated in the protective tube can be easily taken out as necessary without using a special tool, and the structure is simple and the workability is improved. The object is to provide an excellent cable protection tube and the like.

  In order to achieve the above-mentioned object, the first invention is a cable protection tube through which a cable is passed, and has flexibility, and a crest and a trough are alternately formed on the outer periphery. A corrugated tube, and a plurality of protrusions provided on the outer periphery of the corrugated tube and arranged in parallel along the axial direction of the corrugated tube, and an inner diameter ( The minimum inner diameter) is a cable protection tube characterized in that it is larger than the outer diameter on the outer peripheral surface of the peak portion.

  Here, the inner diameter of the inner surface of the protrusion refers to the diameter of a virtual circle that passes from the wall and the top to the inner surface of the protrusion top of the protrusion and is centered on the axis of the protective tube. Since the inner diameter of the top of the protrusion is not constant because it is not formed on the arc at right angles to the arc, the inner diameter of the inner surface of the top of the protrusion is defined as the minimum inner diameter of the top of the protrusion. In addition, the outer diameter of the outer peripheral surface of the peak portion refers to the diameter of the outer peripheral surface of the peak portion at a portion excluding the protruding portion of the protective tube.

  It is desirable that two or more protrusions be provided in parallel with each other in the axial direction of the corrugated tube at different positions in the circumferential section of the corrugated tube, and further repeatedly at predetermined intervals in the tube axis direction.

  The wall thickness of the protruding portion may be thinner than the thickness of the peak portion. Further, a flat portion may be formed on the outer surface of the corrugated tube excluding the protrusion, and further on the opposite side of the tube outer periphery from the position where the protrusion is formed. It is desirable to form the flat portion on the opposite side of the outer peripheral surface of the tube at a position facing the protruding portion forming surface, but it faces the protruding portion forming surface of the corrugated tube outer surface so as to have a predetermined angle. A flat portion may be formed.

  The corrugated tube is preferably made of a polyolefin resin, and the corrugated tube is made of polyethylene or polypropylene, and further contains a lubricant, or it is desirable to apply a lubricant to the inner surface of the tube.

  According to the first invention, the protrusion formed along the axial direction is provided on the outer periphery of the corrugated tube, and the inner diameter (minimum inner diameter) of the protrusion is larger than the outer diameter of the outer peripheral surface of the corrugated tube. Therefore, the protrusion can be easily excised. Therefore, an internal cable can be easily taken out from the cut portion.

In particular, if two protrusions are provided in parallel and the two protrusions are provided at predetermined intervals in the axial direction, the internal cable can be taken out from a desired position after laying the protective tube. Further, if the thickness of the protrusion is thinner than the thickness of the portion other than the protrusion of the corrugated tube, the protrusion can be easily cut off and the strength of the corrugated tube can be ensured.
When the height of the wall portion of the protrusion is larger than the thickness of the cutting edge of the tool for cutting the protrusion, the cutting operation of the protrusion portion is easily performed.

  The second invention is a piping structure characterized in that a cable is passed through the cable protection tube according to the first invention. A part of or all of the protrusions are cut, and slits are provided in parallel at different positions in the circumferential cross section of the corrugated tube, and further, the cable slit is formed by cutting between the parallel slits. A part of the internal cable is taken out from the cable take-out portion, and the cable take-out portion from which the cable is taken out is covered with a cover from the outer periphery of the corrugated tube, and the inner surface of the cover It is desirable that at least a part has a corrugated shape corresponding to the crest and trough, and the cover can cover at least a half circumference in the circumferential direction of the corrugated tube. In this case, it is desirable that at least one end of the cover is formed with an opening for drawing out the cable.

  According to the second invention, it is possible to take out the internal cable from the protective tube at a desired position with a simple structure, and if the take-out part is covered with the cover, foreign matter such as moisture from the outside is inside the protective tube. There is no infiltration. Further, the cover can be provided with an opening such as a cable extraction slit. In this way, if the cover is provided with an opening such as a cable extraction slit, the cable is not damaged when the cable is extracted.

  3rd invention cuts a part or all of the said projection part of the cable protection tube concerning 1st invention with which the cable was previously wired, and is parallel to the position where the circumferential cross section of the said corrugated pipe | tube is different. Cutting between the slits provided in parallel with the corrugated tube, forming a cable take-out part, taking out a part of the internal cable from the cable take-out part, It is a cable laying method characterized by covering with tape or a cover from the outer periphery of an attached tube.

  According to the third invention, the internal cable can be taken out from the protective tube by a simple method at a desired position from the protective tube, and foreign matters such as water enter the protective tube from the cable take-out portion. There is no.

  According to a fourth aspect of the present invention, the cable protection tube according to the first invention is laid, a cable is inserted into the laid cable protection tube, and the cable sent into the cable protection tube is formed in the cable protection tube. The cable protection unit is laid out by inserting the cable again into the cable protection tube from the cable extraction unit from which the cable has been extracted, and feeding the cable from the cable extraction unit. A cable laying method characterized in that a cable passing operation into a pipe is performed at a plurality of locations of the cable protection pipe.

  According to the fourth aspect of the invention, when the cable is routed through the protective tube having a long overall length, the cable that passes from a plurality of locations of the protective tube can be guided into the protective tube. Without being caught, it is possible to reduce the cable resistance of each cable working section.

  5th invention consists of the extrusion part which extrudes a raw material to a cylinder shape, and a some half mold | die which has a waveform on the inner surface, and is a pair which can be moved so that it may become the same speed with respect to the feed direction of the said raw material And a corrugated tube forming apparatus provided with corrugated forming portions provided so that the endless tracks are opposed to each other, and the cylindrical material extruded by the extruding portion is sent to the corrugated forming portion, and a pair of the half-shaped The cylindrical material is sandwiched between the inner molds and air is sucked outside from the inner surface of the half-shaped mold, thereby pressing the cylindrical material against the inner surface of the half-shaped mold and forming a corrugated shape. A method of manufacturing a cable protection tube to be molded, wherein at least some of the half-shaped molds in the endless track have at least a part of the half-shaped molds, and the axial direction of the half-shaped molds A recess is provided along the cable protection tube. The peripheral portion, in the axial direction of the cable protection tube is a method for producing a cable protection tube, wherein a protrusion corresponding to the recess is formed.

  Instead of sucking air from the inner surface of the half-shaped mold to the outside, even if the cylindrical material is pressed against the inner surface of the half-shaped mold by sending air to the inner surface of the cylindrical material Good.

  According to the fifth invention, a corrugated tube can be easily formed by a pair of endless tracks having a plurality of halved molds, and a protrusion can be formed on a part of the mold. Since the recess is formed, a plurality of protrusions can be repeatedly formed at predetermined intervals on the outer periphery of the corrugated tube.

  According to the present invention, the cable housed in the protective tube can be easily taken out without the need for a special tool as needed, and the cable protective tube having a simple structure and excellent workability and a pipe using the same A structure, a cable laying method, and the like can be provided.

It is a figure which shows the protective tube 1, (a) is a general view, (b) is an enlarged view of a projection part vicinity. (A) is axial sectional drawing, (b) is radial sectional drawing of the processus | protrusion 3a part of the protective tube 1. FIG. It is a figure which shows the protection pipe | tube 1 ', (a) is a general view, (b) is an enlarged view of a projection part vicinity. It is a figure which shows the shape of protrusion 3b, (a) is an expanded sectional view which shows the thickness of protrusion 3b, (b) is a cross-sectional oblique view which shows the internal diameter of protrusion 3a, 3b. It is a figure which shows the protective tube manufacturing apparatus 15, (a) is a general view, (b) And (c) is an expanded sectional view of the metal mold | die 21, 21a. It is a figure which shows the protective tube manufacturing apparatus 15a, (a) is a general view, (b) And (c) is an expanded sectional view of the metal mold | die 21, 21a. It is a figure which shows the process of cutting off processus | protrusion 3a, 3b of the protective tube 1, (a) is sectional drawing of an axial direction, (b) is sectional drawing of radial direction. The figure which shows the process of providing the cable extraction part 39, (a) is the figure which shows the state in which the processus | protrusions 3a and 3b of the protective tube 1 were excised, and the slits 35a and 35b were formed, (b) The state which cut | disconnected between slits FIG. The figure which shows the cable extraction part 39. FIG. (A) is a figure which shows the state which took out the cable 41 inside the protective tube 1, (b) is a figure which shows the state which provided the cover 43 in the cable extraction part 39. It is a figure which shows the cover 43, (a) is a perspective view which shows the state before attaching the cover 43, (b) is a perspective view which shows the state which attached the cover 43, (c) shows the state which attached the cover 43. Radial direction sectional drawing. The figure which shows the state which laid the protective tube 1. FIG. The figure which shows the process of routing a cable into the protective tube 1 later. Radial direction sectional drawing of protective tube 1a, 1b. The top view of the protective tube 1c. Radial direction sectional drawing of protective tube 1d and 1e.

  Hereinafter, protection tube 1 concerning an embodiment of the invention is explained. 1A and 1B are diagrams showing the protective tube 1, FIG. 1A is an overall view, and FIG. 1B is an enlarged perspective view in the vicinity of the protrusion 3. 2 is a cross-sectional view of the protective tube 1, FIG. 2 (a) is a cross-sectional view of the protective tube 1 in the axial direction, and is a cross-sectional view taken along line BB in FIG. 2 (b). Moreover, FIG.2 (b) is sectional drawing of the radial direction of the protective tube 1, and is the sectional view on the AA line of Fig.2 (a).

  The protective tube 1 is a corrugated tube having flexibility, and the ridges 5 or the valleys 7 are alternately formed in the axial direction of the protective tube along the outer periphery. The peaks 5 and valleys 7 may be alternately formed independently of each other, or the peaks 5 and valleys 7 may be continuously provided spirally in the axial direction of the protective tube 1. .

  In the axial direction of the protective tube 1, protrusions 3 that protrude from the outer peripheral portion of the protective tube 1 with a predetermined interval are repeatedly formed. The intervals at which the protrusions are repeatedly provided in the axial direction of the protective tube can be formed at predetermined intervals as necessary. For example, considering the length of panels and folds of houses and buildings, it is possible to set the length of one sheet or about half the length. In this case, the axial direction of the protective tube 1 And may be formed at intervals of about 40 to 100 cm. As shown in FIG. 1B and FIG. 2B, the protrusion 3 is composed of a pair of protrusions 3a and 3b. The protrusions 3 a and 3 b protrude outward from the peak portion 5 of the protective tube 1, and are provided in parallel with each other along the axial direction of the protective tube 1. The protrusions 3a and 3b do not have to be provided in parallel with each other along the axial direction of the protective tube 1, and may have a predetermined angle.

  As shown in FIG. 2 (b), the protrusions 3a and 3b protruding in the same direction outward of the protective tube 1 do not protrude in the respective radial directions of the protective tube 1, but protrude from the protrusions 3a and 3b. The directions protrude in directions parallel to each other. Although not shown, the protrusions 3a and 3b may be protruded so as to have a predetermined angle in the radial direction of the protective tube 1 respectively. Even in this case, although the protrusion direction of the protrusion is not parallel, the protrusion can be provided in parallel in the axial direction at a position where the cross section of the protective tube is different, and the effect of the present invention can be obtained.

Further, as shown in FIG. 2A, the protrusion 3 a (same for the protrusion 3 b) is provided with a predetermined length so as to straddle the plurality of peaks 5 and valleys 7. The protrusions 3a and 3b are preferably the same length. The dimensions of the protrusions can be set to, for example, a width of 1.5 mm and a length of 50 mm, but the dimensions can be changed as necessary. The width of the protrusions is preferably about 1 to 3 mm and the length is preferably about 40 to 100 mm. . The reason for this is that the cutting ability of the protrusion and the cable drawing ability from the slit described later are taken into consideration.
Here, the interval between the projections arranged in parallel can be arbitrarily set, but for example, it is desirable to make the dimension slightly larger than the radius of the protective tube, and to the dimension of the protective tube [diameter: 10 to 35φ]. Accordingly, it is set to about 6 to 20 mm. The reason for this is that when the projection is cut, the other projection in parallel does not become an obstacle to the cutting operation, and the cable drawability is taken into consideration.

  In addition, although the protective tube 1 shown in FIGS. 1 and 2 shows an example in which a plurality of protrusions 3a and 3b are provided at predetermined intervals in the axial direction, the present invention is not limited to this. For example, the protrusions 3a and 3b may be formed continuously in the axial direction of the protective tube.

  3A and 3B are diagrams showing the protective tube 1 ′ provided with the protrusions 3a and 3b continuously. FIG. 3A is an overall view, and FIG. 3B is an enlarged perspective view of the vicinity of the protrusion 3. is there. As shown in FIG. 3, the protrusions 3 a and 3 b may have a predetermined length and may be formed over substantially the entire length in the axial direction of the protective tube 1 ′ without providing a plurality of protrusions with a predetermined interval. In the following description, the protective tube 1 (provided with a plurality of protrusions 3 with a predetermined interval) will be described unless otherwise specified.

The protective tube 1 is made of a flexible resin, for example, a polyolefin resin, and more preferably polyethylene or polypropylene. Further, it is desirable that a lubricant is added. The lubricant is desirably compatible with the resin constituting the protective tube 1, and for example, a fatty acid-based lubricant can be used.
When included in polyolefin resins, it is recommended to use unsaturated fatty acid amide-based lubricants. These fatty acid amide compounds melt with the resin and migrate to the surface of the resin in the subsequent molding process to exhibit lubricity. . In particular, oleic acid amide, stearic acid amide, erucic acid amide and the like exhibit good lubricity.
As the fatty acid-based lubricant, for example, a mixture of polyacrylate, polyhydric alcohol, fatty acid salt and the like can be used. However, when these lubricants are contained in a resin, the moldability may be lowered. It is used as an external lubricant for improving the lubricity on the contact surface of the tube, and when used by spraying or applying to the inner surface of the tube after molding, the cable slips better and the wiring operation becomes easier. (For example, refer to Japanese Unexamined Patent Application Publication Nos. 2006-158197 and 2006-132586 as such a lubricant.)

  4A is an enlarged view of a portion C (projection 3b) in FIG. 2B, and FIG. 4B is a cross-sectional perspective view of the projections 3a and 3b. 4A and 4B both show a cross section at the position of the peak 5.

  As shown in FIG. 4A, the protrusion 3 b (the same applies to the protrusion 3 a) has a pair of wall portions 11 and a top portion 9. The wall portion 11 stands on the outer periphery of the protective tube 1 in the substantially same direction as the protruding direction of the protrusion 3 b, and the end portion is closed by the top portion 9. Here, it is desirable that the wall portion 11 (D portion in the drawing) of the wall portion 11 of the protrusion 3b is thinner than the thickness of the peak portion 5 (E portion in the drawing). The shape of the top of the protrusion is basically a rectangular shape as shown in FIG. 4A, but the shape of the top of the protrusion may protrude toward the tip of the top. It is preferable that the thickness of the wall portion of the protrusion is thinner than the thickness of the peak portion because it is easy to cut when cutting the protrusion described later. Here, assuming that the thick central portion of the tubular body at the position where both wall portions 11 of the protrusion 3b (3a) stand up is the base portions 8a and 8b, the midpoint of the line connecting the base portions 8a and 8b is the base portion center 10. And

  Further, as shown in FIG. 4B, the diameter (G in the figure) of the virtual circle (projection top inner circumferential circle 13) passing through the inner surface position of the top of the projections 3a and 3b is the projection 3a, It is larger than the diameter of the maximum outer circumference circle at a portion other than 3b (that is, the outer diameter of the top of the peak 5 (F in the figure)). Accordingly, the protrusions 3 a and 3 b protrude at least from the outer peripheral surface of the peak portion 5. That is, wall portions 11 are formed on both side portions of the top portion 9. The virtual circle passing through the inner surface position of the top of the protrusions 3a and 3b is the smallest virtual circle that passes through the top 9 of the protrusion 3a or the protrusion 3b and is centered on the axis of the protective tube 1.

  Next, a method for manufacturing the protective tube 1 will be described. FIG. 5 is a view showing the protective tube manufacturing apparatus 15. The protective tube manufacturing apparatus 15 mainly includes an extruder 17, endless tracks 19a and 19b, and the like.

  First, the resin is extruded into a cylindrical shape from the extruder 17, and the cylindrical material 23 is sent to the back of the protective tube manufacturing apparatus 15 (in the direction of arrow H in the figure). The cylindrical material 23 is sandwiched between a pair of endless tracks 19a and 19b. The endless tracks 19a and 19b rotate in opposite directions, i direction and j direction, respectively. The endless tracks 19a and 19b are composed of a plurality of molds 21 and the like.

  The endless tracks 19a and 19b have molding portions 22 that move in the same direction and at the same speed with respect to the feeding direction of the protective tube manufacturing apparatus 15, and face each other. In the molding unit 22, the mold 21 and the like move at the same speed in the feeding direction in synchronization with the feeding speed of the tubular material 23. In the molding part 22, the molds 21 of the endless tracks 19a and 19b face each other and are in close contact with each other.

  As shown in FIG. 5 (b), the mold 21 is a half-shaped half-cylinder member in which a concave portion 27, a convex portion 29, and the like are formed on the inner surface according to the outer shape of the protective tube 1. A pair of metal molds 21 face each other to form a cylindrical member, and a waveform corresponding to the outer shape of the protective tube 1 is formed on the inner surface.

  As shown in FIG. 5A, a mold 21 a is installed on the endless track 19 a instead of a part of the plurality of molds 21. Unlike the mold 21, the mold 21 a is formed with a groove portion 31 in addition to the concave portion 27 and the convex portion 29. The groove 31 has a shape corresponding to the protrusions 3 a and 3 b of the protective tube 1.

  FIG.5 (b) is a figure which shows the cross section which shows the state which the metal mold | die 21a and the metal mold | die 21 faced each other. A cylindrical material 23 is fed into a cylindrical space formed by the molds 21a and 21. A plurality of holes (not shown) are provided in the molds 21 and 21a, and air inside is sucked from the outside (in the direction of arrow K in the figure).

  Since the air between the molds 21 and 21a and the cylindrical material 23 is sucked to the outside of the molds 21 and 21a, as shown in FIG. It is pressed against the inner surface (in the direction of arrow L in the figure). Therefore, the cylindrical material 23 is formed into a shape corresponding to the inner shape of the molds 21 and 21a. That is, the concave portions 27 of the molds 21 and 21a become the peak portions 5, the convex portions 29 become the valley portions 7, and the groove portions 31 become the protrusions 3a and 3b.

  Thus, the corrugated tube 25 having a corrugated shape on the outer periphery is formed. Since the corrugated tube 25 is formed by pressing the cylindrical member 23 against the molds 21 and 21 a, the inner surface of the corrugated tube 25 has a shape corresponding to the outer surface of the corrugated tube 25. Further, the cylindrical member 23 has a substantially uniform thickness, but when the cylindrical material 23 is pressed against the molds 21 and 21a, a portion having a larger outer diameter has a large deformation amount, and thus the thickness is large. Slightly thinner. That is, in the corrugated tube 25, the thickness of the protrusions 3 a and 3 b is thinner than the thickness of the peak portion 5 and the valley portion 7.

  The formed corrugated tube 25 is sent from the endless tracks 19a and 19b to a cooling unit, a winding unit, and the like, which are not shown, and the protective tube 1 is manufactured. In the example shown in FIG. 5A, the example in which two molds 21a are provided on the endless track 19a is shown, but the present invention is not limited to this. What is necessary is just to set the number of installation of the metal mold | die 21a according to the space | interval of the projection part 3. FIG.

  Further, as described above, when manufacturing the protective tube 1 ′ in which the protruding portions 3 a and 3 b are continuously formed in the axial direction, the mold in which the groove portion 31 is formed over the entire length is connected to the endless tracks 19 a and 19 b. What is necessary is just to arrange | position in all the metal mold | die positions. By doing in this way, the continuous protrusion part 3a, 3b can be formed in the outer peripheral part of the protective tube 1 '.

  FIG. 6 is a view showing another protective tube manufacturing apparatus 15a. In addition, about the structure which show | plays the same function as the protection tube manufacturing apparatus 15 in the protection tube manufacturing apparatus 15a, the code | symbol same as FIG. 5 is attached | subjected and the overlapping description is abbreviate | omitted.

  The protection tube manufacturing apparatus 15a is different from the protection tube manufacturing apparatus 15 in that an inner tube 33 is provided. An inner tube 33 is provided in the extruder 17 of the protective tube manufacturing apparatus 15a. The inner tube 33 is provided so as to be inserted into the cylindrical material 23 by a predetermined length.

  As shown in FIG. 6B, the cylindrical material 23 is fed into a cylindrical space sandwiched between the molds 21 and 21 a, and an inner tube 33 is provided inside the cylindrical material 23. The inner tube 33 is provided with a plurality of holes (not shown). Air is sent into the inner pipe 33 from the extruder 17 side. Therefore, air is sent from the inside of the inner tube 33 to the outside (in the direction of arrow M in the figure).

  The cylindrical material 23 is pressed against the inner surfaces of the molds 21 and 21a by the air from the inside of the inner tube 33 (in the direction of arrow N in the figure). Therefore, the cylindrical material 23 is formed into a shape corresponding to the inner shape of the molds 21 and 21a. In addition, the air sent from the inner pipe 33 passes outside from the exit side (the left side of the endless tracks 19a and 19b in the figure) of the corrugated pipe 25. Thus, the corrugated tube 25 is formed. The formed corrugated tube 25 is sent from the endless tracks 19a and 19b to a cooling unit, a winding unit, and the like, which are not shown, and the protective tube 1 is manufactured.

  Next, how to use the protective tube 1 will be described. 7-11 is a figure which shows the usage method of the protective tube 1. FIG. In addition, although the cable may be previously connected between the protection between 1, in FIG. 7-9, illustration of an internal cable is abbreviate | omitted. First, as shown in FIG. 7, the wall portions 11 of the protrusions 3a and 3b of the protective tube 1 are cut along the longitudinal direction (O portion in the figure), and the top portion 9 is cut off. At this time, the protrusions 3a and 3b are thinner than the peak portion 5 and the like, and the inner surface of the top portion 9 of the protrusions 3a and 3b is located outward from the peak portion 5, so that the top portion 9 can be easily removed. In addition to being able to cut the internal cable accidentally.

  By cutting off the top portions 9 of the protrusions 3a and 3b, a pair of slits 35a and 35b are formed in the protective tube 1 as shown in FIG.

  Next, as shown in FIG. 8B, the protective tube 1 is placed in a direction substantially perpendicular to the longitudinal direction of the slits 35a and 35b (that is, in the circumferential direction of the protective tube 1) so as to connect the slits 35a and 35b. It cuts and the cutting part 37 is formed. Since the protective tube 1 has flexibility, the slits 35a and 35b can be easily cut. A U-shaped cut extending in the tube axis direction is formed by the slits 35 a and 35 b and the cutting portion 37, and a portion where the U-shaped cut is formed becomes the cable extraction portion 39.

  As shown in FIG. 9, the cable take-out portion 39 has flexibility and can be easily deformed (for example, in the P direction in the figure), and the internal cable can be easily handled from the cable take-out portion 39. .

  FIG. 10 is a diagram illustrating a state in which the cable 41 that has been passed through the protective tube 1 is pulled out of the protective tube 1. For example, by forming the cable take-out portion 39 from a state where a plurality of cables are wired inside the protective tube 1, the internal cable 41 can be easily pulled out as necessary. The cable 41 is an optical fiber cable, for example, and a necessary number of cables 41 are passed through the protective tube 1.

  After the cable 41 is taken out from the protective tube 1, as shown in FIG. 10 (b), water and foreign substances are introduced into the protective tube 1 from the cable takeout portion 39 formed by the slits 35 a and 35 b and the cutting portion 37. A cover 43 is provided to prevent entry of small animals and the like. With the cable take-out portion 39 closed by the cover 43, the take-out operation of the cable 41 is completed.

  In addition, with respect to the protective tube 1 ′ in which the protruding portions 3 a and 3 b are continuously formed in the axial direction, the protruding portions 3 a and 3 b are cut off by an arbitrary length with respect to the protruding portions 3 a and 3 b at arbitrary positions. That's fine. In this case, it is desirable that the protrusions 3a and 3b be cut by the same length at the same position in the axial direction of the protective tube 1 '.

  FIG. 11 is a diagram illustrating the configuration of the cover 43. As shown in FIG. 11A, the cover 43 is a semi-cylindrical member having flexibility and having an inner surface shape corresponding to the outer shape of the protective tube 1. The total length of the cover 43 is slightly larger than that of the cable extraction portion 39, and it is desirable that the cover 43 can be completely covered. At least one end of the cover 43 is formed with a notch 45 that is an opening.

  In a state where the cable 41 is taken out from the cable take-out portion 39 (for example, in a state where it is taken out from the slit 35b), the cover 43 is fitted on the outer surface of the protective tube 1 so as to cover the cable take-out portion 39 (in the direction of arrow Q in the figure).

  FIG. 11B is a perspective view showing a state where the cover 43 is attached, and FIG. 11C is a radial cross-sectional view of this state. The cable 41 is led out from the notch 45. Further, since the cable take-out portion 39 is covered by the cover 43, water or the like is prevented from entering the inside from the cable take-out portion 39. The cover 43 can cover more than half of the entire circumference of the protective tube 1. That is, since the cover 43 has flexibility, when the cover 43 is fitted to the protective tube 1, the cover 43 is pressed against the protective tube so that the opening (lower end) of the cover 43 is pressed by the pressing force. The protective tube 1 is opened while sliding along the outer periphery. Further, in the state where the cover 43 is placed on the protective tube 1, the cover 43 covers at least half of the circumference of the protective tube 1, and the lower end of the cover 43 holds the outer periphery of the protective tube 1, so the cover 43 is securely fixed. The

  In addition, the aspect of the cover 43 is not restricted to what is shown in FIG. For example, the uneven shape of the inner surface of the cover 43 according to the outer shape of the protective tube 1 does not need to be provided over the entire cover 43, and may be only a part of the cover 43. As described above, by providing the inner surface of the cover 43 with an uneven shape corresponding to the outer shape of the protective tube 1, the protective tube 1 and the cover 43 are firmly fitted and the protective tube is prevented from moving in the axial direction. As a result, it is possible to reliably prevent the cover from coming off or moving in the axial direction. In order to fit the cover, the shape of the inner surface of the cover does not necessarily need to be corrugated, and the inner surface of the cover only needs to have a protrusion such as a protrusion that fits into the trough of the protective tube. .

  Next, a method for laying the protective tube 1 will be described. FIG. 12 is a view showing a state in which the protective tube 1 is laid. For example, the protective tube 1 is laid in advance at a cable wiring position. At this time, a cable is passed through the inside in advance or after the protective tube is laid. The protective tube 1 may be installed indoors or outdoors.

  For example, when a cable is drawn into each room such as an apartment house, the cable 41 is drawn into each room from the insertion hole 42 of each room. At this time, the protruding portion 3 in the vicinity of the insertion hole 42 is processed by the above-described method to form the cable extraction portion 39, and the cover 43 is provided so as to close the cable extraction portion 39 after the cable is extracted. The cable 41 taken out from the cable take-out portion 39 is drawn into each room through the insertion hole 42, and the cable laying is completed. Thus, in order to draw the cable 41 from the laid protective tube 1, the projections 3 that are easy to form slits are repeatedly provided at predetermined intervals of, for example, 40 to 100 cm. Since the protrusion 3 located near the portion to be pulled in is processed to form the cable extraction portion 39 and the internal cable 41 is extracted, the construction is easy and convenient.

  Next, a method when the cable 41 is passed through the laid protective tube 1 after laying will be described. FIG. 13 is a diagram illustrating a process of passing the cable 41 into the protective tube 1 that has already been laid, for example, when the cable 41 is newly inserted into the protective tube 1. In the example of FIG. 13, an example in which a cable is passed through the protective tube 1 from the tube end 47 to the relay box 44 will be described.

  First, a dummy cable take-out portion 39a is constructed at an intermediate portion or the like in a range where the cable 41 is desired to be passed. The cable take-out portion 39a is desirably, for example, an intermediate point from the start point to the end point of the line, or near the corner portion of the laid protective tube 1 as shown in FIG.

  Next, a cable end 49 that is an end of the cable 41 is inserted from the tube end 47 (starting point) of the protective tube 1 (in the direction of arrow R in the figure). Note that the insertion portion (starting point) of the cable end portion 49 is not limited to the tube end 47 of the protective tube 1 and may be the cable extraction portion 39.

  Next, the cable 41 is fed into the protective tube 1 and the cable end portion 49 is passed to the cable take-out portion 39a. When the cable 41 is connected to the cable extraction portion 39a, the cable end portion 49 is extracted from the cable extraction portion 39a as shown in FIG. 13B (in the direction of arrow S in the figure).

  When the cable 41 having a certain length is pulled out from the cable take-out portion 39, the cable end portion 49 is again inserted into the cable take-out portion 39a and fed toward the relay box 44 (end point) (in the direction of arrow T in the figure).

  In this state, as shown in FIG. 13 (c), the cable 41 is further fed from the tube end 47, and the cable 41 is pulled out from the cable outlet 39a while the cable 41 is pulled out. In other words, the cable 41 is routed from a plurality of locations of the laid protective tube 1.

  For this reason, for example, for the wiring work from the tube end 47 into the protective tube 1, only the line resistance from the tube end 47 to the cable extraction portion 39 a is received, and the communication from the cable extraction portion 39 a Only the line resistance from the take-out portion 39a to the relay box 44 is received. For this reason, even if it is a long distance wiring work, the cable 41 can be easily passed.

  In particular, in the vicinity of the corner portion of the laid protective tube, the cable 41 is caught and the wiring operation is difficult. If the cable extraction portion 39a (that is, the wiring operation portion) is provided in the vicinity of the corner portion, it is difficult. Since the cable 41 can be easily guided, the wiring operation is easy.

  In addition, you may arrange | position the cable extraction part 39a not only in one place but in multiple places. Further, since the dummy cable lead-out portion 39a may be completely closed after the wiring operation, it may be covered with a cover or the like not having the notch 45.

  As described above, according to the protective tube 1 according to the present embodiment, the protrusions 3a and 3b are repeatedly provided along the axial direction on the outer periphery of the protective tube 1, and the inner surfaces of the protrusions 3a and 3b are peaks. Since it protrudes from the outer peripheral surface of 5, the top part 9 of the protrusions 3a and 3b can be easily cut off. Further, the internal cable 41 is not damaged. Moreover, since the thickness of the protrusions 3a and 3b is thinner than the thickness of the peak portion 5 and the like, the protrusions 3a and 3b can be easily cut out while maintaining the strength of the protective tube 1. Therefore, the cable take-out portion 39 can be easily provided, and the cable 41 can be easily laid.

  Further, since the pair of protrusions 3a and 3b are provided in parallel, the cable take-out portion 39 can be easily formed. Furthermore, since the protrusion 3 is repeatedly provided in the axial direction of the protective tube 1 at a predetermined interval, it is possible to easily cope with a positional deviation or a design change of the cable take-out portion 39 after laying.

  Further, the corrugated tube 25 can be easily formed by a pair of endless tracks 19a and 19b having a plurality of halved molds 21 and 21a. Is formed at a desired interval, so that the protective tube 1 can be easily manufactured.

  Moreover, since the cable extraction part 39 is covered with the cover 43 after the internal cable 41 is taken out, moisture, foreign matter, small animals, etc. do not enter the inside of the protective tube 1 from the outside.

  In addition, when the cable 41 is passed through the protective tube 1 having a long overall length, the cable 41 can be guided from a plurality of locations of the protective tube 1, so that the cable 41 is not caught in the protective tube. In addition, it is possible to reduce the resistance of the cable 41 in each of the wiring working units. Therefore, the work of passing the cable 41 can be easily performed.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. 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.

  For example, if it is possible to close the cable take-out portion 39, the cable take-out portion 39 may be closed with an adhesive tape or the like instead of the cover 45.

  Moreover, although the protrusion part 3 was comprised with a pair of protrusion 3a, 3b, it is not restricted to this. For example, like the protective tube 1a shown in FIG. 14A, the projections 3a and 3b and the projections 3c and 3d may be provided on both sides of the protective tube 1a. In this case, the mold 21a may be installed on each of the endless tracks 19a and 19b. By doing in this way, the cable extraction part 39 can be provided in the up-down direction of the protective tube 1. In this case, the protrusions 3a and 3b and the protrusions 3c and 3d do not have to be provided at the same position in the axial direction. By providing protrusions on both sides of the protective tube 1a, the protruding surface can be pressed against the wall surface, etc., making it easy to stabilize the piping, and even if the piping is twisted in the middle, it protrudes on both sides of the protective tube. Since it is only necessary to use a protrusion on either side of the pipe, the cable can be easily taken out and installed.

  Further, like the protective tube 1b shown in FIG. 14B, the projections 3a, 3b, and 3c may be provided on one side of the protective tube 1b, and two or more projections may be provided. At this time, it is not necessary to make the interval between the projections 3a and 3b and the interval between the projections 3b and 3c the same. In this case, when the cable take-out portion 39 is provided, the size of the cable take-out portion 39 can be changed as necessary, such as between the protrusions 3a and 3b, between the protrusions 3b and 3c, and between the protrusions 3a and 3c. As described above, by providing two or more protrusions by changing the arrangement interval on the circumference of the protrusions arranged to face each other in parallel, the protrusions to be cut and removed according to the number and shape of the cables drawn out from the protective tube As a result, the slit size to be formed can be changed, so that it is easier to use.

Further, like the protective tube 1c shown in FIG. 15, the pair of protrusions 3a and 3b provided along the axial direction of the protective tube 1c and the direction substantially perpendicular to the longitudinal direction of the protrusions 3a and 3b (that is, the protective tube 1c Further circumferential protrusions 3e may be provided between the protrusions 3a and 3b. In this case, it is only necessary to cut the top portion 9 of the protrusion 3e with respect to the cutting portion 37, and the cable extraction portion 39 can be formed more easily. Needless to say, the various modifications described above can be combined.
As shown in FIG. 2B, the protrusions 3a and 3b protrude outward in the same direction from the protective tube 1, and the protrusions 3a and 3b are parallel to each other. May be projected in the radial direction of each of the protective tubes 1.

  Further, as in the protective tube 1d shown in FIG. 16A, a protrusion having a flat portion 50a may be provided on a part of the side opposite to the side where the protrusions 3a and 3b are provided. The flat part 50a has a flat surface and is used for an attaching part such as a bolt when the protective tube 1d is installed. Similarly, as shown in FIG. 16B, a dent having a flat portion 50b may be provided on a part of the side opposite to the side where the projections 3a and 3b are provided. In any case, if a flat portion having a flat surface is provided on the side opposite to the side on which the projections 3a and 3b are provided, the protection tube can be easily attached. Note that. The flat portions 50a and 50b may be provided over the entire length of the protective tube, or only a part thereof. Further, depending on the mounting direction of the protective tube 1, it may be provided not only on the side opposite to the side on which the projections 3a and 3b are provided, but also on the side or at an oblique position. Here, the protrusion forming surface is a straight line X connecting the base centers 10 of the two protrusions that are arranged farthest apart from each other in a plurality of protrusions formed at different positions in the circumferential direction on the tube cross section. The base portion center 10 is an intermediate point of a line connecting the thick central portions of the base portions (tube portions) of both side walls of the protrusion. Here, the flat surfaces 50a and 50b may be provided so as to face the protruding portion forming surface, or the flat portions 50a and 50b may be provided so as to face the protruding portion forming surface with a predetermined angle. . If it arrange | positions in this way, it will be able to do installation work.

1a, 1b, 1c ......... Protection tube 3 ......... Protrusions 3a, 3b, 3c, 3d ......... Protrusions 5 ......... Mountain 7 ......... Valley 8a, 8b ......... Base 9 ... ... Top 10 ......... Base Center 11 ......... Wall 13 ......... Projection Top Inner Circle 15 ......... Protection Tube Manufacturing Device 17 ......... Extruders 19a, 19b ......... Endless Tracks 21, 21a ... ...... Mold 22 ...... Molded part 23 ...... Tubular material 25 ...... Corrugated tube 27 ...... Concave part 29 ...... Convex part 31 ...... Groove parts 35 a, 35 b ...... Slit 37 …… ... Cut 39 ......... Cable take-out part 41 ......... Cable 42 ......... Through hole 43 ......... Cover 44 ...... Relay box 45 ......... Notch 47 ......... Pipe end 49 ......... Cable end 50a, 50b ......... flat part

In order to achieve the above-mentioned object, the first invention is a cable protection tube through which a cable is passed, and has flexibility, and a crest and a trough are alternately formed on the outer periphery. Two or more corrugated tubes are arranged in parallel so as to straddle a plurality of the crests and the valleys along the axial direction of the corrugated tube at two or more different positions in the circumferential section of the corrugated tube , further comprising a plurality of protrusions provided repeatedly at a predetermined interval in the axial direction of the tube, the inner diameter (minimum inner diameter) on the inner surface of the projecting portion is much larger than the outer diameter of the outer peripheral surface of the mountain portion, the projection The cable protective tube is characterized in that the wall thickness of the portion is thinner than the thickness of the peak portion .

Also, at a position except for the protrusions of the outer periphery of the wave with tube may be formed a flat portion on the opposite side of the Kangaishu the further formation position of the protrusion. It is desirable to form the flat portion on the opposite side of the outer peripheral surface of the tube at a position facing the protruding portion forming surface, but it faces the protruding portion forming surface of the corrugated tube outer surface so as to have a predetermined angle. A flat portion may be formed.

In order to achieve the above-mentioned object, the first invention is a cable protection tube through which a cable is passed, and has flexibility, and a crest and a trough are alternately formed on the outer periphery. Two or more corrugated tubes are arranged in parallel so as to straddle a plurality of the crests and the valleys along the axial direction of the corrugated tube at two or more different positions in the circumferential section of the corrugated tube, And a plurality of protrusions that are repeatedly provided in the tube axis direction at predetermined intervals and can be cut to form slits for cable outlets at different positions in the circumferential direction of the corrugated tube. An inner diameter (minimum inner diameter) of the inner surface of the protrusion is larger than an outer diameter of the outer peripheral surface of the peak portion, and a wall thickness of the projection portion is thinner than a thickness of the peak portion. It is a tube.

Claims (13)

A cable protection tube through which the cable is passed,
A corrugated tube having flexibility and having ridges and valleys formed alternately on the outer periphery,
Provided on the outer periphery of the corrugated tube, comprising a plurality of protrusions provided in parallel along the axial direction of the corrugated tube,
An inner diameter (minimum inner diameter) of the inner surface of the protrusion is larger than an outer diameter of the outer peripheral surface of the peak portion.   Two or more of the protrusions are provided in parallel in the axial direction of the corrugated tube at different positions in the circumferential cross section of the corrugated tube, and further provided repeatedly at a predetermined interval in the tube axis direction. Item 1. A cable protection tube according to item 1.   The thickness of the wall part of the said projection part is thinner than the thickness of the said peak part, The cable protective tube of Claim 1 or Claim 2 characterized by the above-mentioned.   The flat portion is formed to face the protrusion forming surface formed by the protrusion substantially parallel to the flat portion, or the flat portion is formed to face the protrusion forming surface so as to have a predetermined angle. The cable protection tube according to any one of claims 1 to 3, wherein the cable protection tube is characterized in that:   The cable protection tube according to any one of claims 1 to 4, wherein the corrugated tube is made of a polyolefin resin.   6. The cable protection tube according to claim 5, wherein the corrugated tube is made of polyethylene or polypropylene and further contains a lubricant, or the lubricant is applied to an inner surface thereof.   A piping structure, wherein a cable is passed through the inside of the cable protection tube according to any one of claims 1 to 6. A part of or all of the protrusions are cut, and slits are provided in parallel at different positions in the circumferential cross section of the corrugated tube, and further, the cable slit is formed by cutting between the parallel slits. ,
A part of the internal cable is taken out from the cable take-out part,
The cable take-out portion from which the cable has been taken out is covered with a cover from the outer periphery of the corrugated tube,
At least a part of the inner surface of the cover has a corrugated shape corresponding to the crest and trough of the cable protection tube, or has a protrusion that fits into the trough of the cable protection tube, The cover and the cable protection tube are fitted by the corrugated shape or the protrusion, and the cover can cover at least a half or more of the circumferential direction of the corrugated tube. The piping structure described. In the piping structure according to claim 8,
A piping structure characterized in that an opening for drawing out a cable is formed at least at one end of the cover. The cable protection tube according to any one of claims 1 to 6, wherein the cable is previously passed, cuts part or all of the protrusions, and is parallel to different positions in the circumferential section of the corrugated tube. A slit,
Cutting between the slits provided in parallel with the corrugated tube, forming a cable take-out part,
Remove a part of the internal cable from the cable extraction part,
A cable laying method, wherein the cable take-out portion is covered with a tape or a cover from an outer periphery of the corrugated tube. Laying the cable protection tube according to any one of claims 1 to 6,
Insert the cable into the installed cable protection tube,
The cable sent into the cable protection tube is extracted from a cable take-out portion formed in the cable protection tube,
From the cable outlet from which the cable has been extracted, insert the cable again into the cable protection tube,
A cable laying method characterized in that a cable passing operation into the laid cable protection pipe is performed at a plurality of locations of the cable protection pipe by feeding the cable from the cable take-out portion. An extrusion section for extruding the material into a cylindrical shape;
A corrugated part formed of a plurality of halved molds having corrugations on the inner surface, provided so that a pair of endless tracks that can move at the same speed with respect to the feed direction of the material are opposed to each other,
Using a corrugated tube forming apparatus comprising:
Sending the tubular material extruded by the extruding part to the corrugated part,
The cylindrical material is sandwiched between a pair of the half-shaped molds,
A method of manufacturing a cable protection tube, wherein the cylindrical material is pressed against the inner surface of the half-shaped mold by sucking air to the outside from the inner surface of the half-shaped mold,
Among the plurality of halved molds in the endless track, at least some of the halved molds are provided with a recess along the axial direction of the halved molds,
A method of manufacturing a cable protection tube, wherein a projection corresponding to the recess is formed in an outer peripheral portion of the cable protection tube in an axial direction of the cable protection tube.   Instead of sucking air from the inner surface of the half-shaped mold to the outside, the air is sent to the inner surface of the cylindrical material to press the cylindrical material against the inner surface of the half-shaped mold The method for manufacturing a cable protection tube according to claim 12, wherein:

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