JP2008178271A - Piping structure and piping method for protective pipes such as cables. - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure and a method for piping a protection pipe for a cable or the like which improves the piping/wire passing workability, as well as the appearance. <P>SOLUTION: A non-flexible linear corrugated pipe is disposed in a linear piping section, comprises a thermoplastic synthetic resin; the flexible corrugated pipe is disposed in a curved piping section adjacent to the linear piping section, and comprises the thermoplastic synthetic resin. Ends of the non-flexible linear corrugated pipe and the flexible corrugated pipe are coupled by a pipe joint, and at least a linear corrugated pipe is fixed to a wall, a floor, a column or the other peripheral members. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a piping structure and a piping method for a communication cable and electrical wiring (hereinafter referred to as “cable or the like”) protective pipe.

Furthermore, the piping structure and piping method for protective pipes such as cables according to the present invention include buried piping (floor slabs, walls, etc.) in factories, warehouses, indoor parking lots, various underground structures and other structures, outer walls, and rooftops. The present invention relates to a piping structure and a piping method used for piping of protective pipes such as the following cables (excluding pipes embedded in reinforced concrete such as columns and beams).
Exposed piping: Piping installed in an exposed state on the inner and outer surfaces of wall surfaces, ceiling surfaces, and other structures.
Concealed piping: Piping installed in a concealed state in a double ceiling, in a lightweight partition (medium space partition), in a pipe shaft, etc.

This type of protective tube such as cable is in line with the internal / external structure of the structure as compared with the case of the cable protective tube that is buried in the outer tube buried in the ground or the cable protective tube buried in the ground. Since piping is necessary, there are far more bent piping sections in the piping area (referred to as parts that require bent piping due to objective conditions in the piping area and convenience of piping).
The inventors searched patent documents and the like for this type of piping structure and method, but could not find a prior art that could correspond to the present invention, so piping commonly used in this type of industry as a conventional technology. Is described below.

The first conventional piping structure uses a metal pipe such as a steel pipe with anti-corrosion treatment on the surface. In the straight piping section, a pipe cut to a corresponding length with a circular saw cutter is bent and bent 90 degrees. A fixed-length elbow is connected to the piping part, and both are connected by a pipe joint. However, depending on the situation at the site, if there is a bent pipe part other than 90 °, the necessary part of the metal pipe is bent by the vendor by the required amount.
According to this piping structure, it takes a lot of labor to cut and bend the pipe, it takes time, the workability is poor, and the accuracy of the bending angle of the pipe cannot be ensured (excessive bending or insufficient bending occurs). There was also a problem in workability. Further, there are problems of generation of chips due to cutting and noise during processing. Also, metal pipes are heavier than resin pipes, so the burden on workers is large, the coefficient of friction μ is about 0.5, and the coefficient of friction of synthetic resin pipes is about 0.3 to about 0.4. There is also a problem such as a large line resistance.

The second of the conventional piping structures uses hard polyvinyl chloride pipes, etc. In the straight piping section, pipes that have been cut to the corresponding length by a cutter are used, and in the 90 ° bending piping section, standard products are used. The elbow is piped, and both the straight pipe part and the bent pipe part are connected by bonding with a pipe joint. For example, when a pipe has an S-shape or a bent pipe portion other than 90 °, the pipe is bent by a necessary amount by heating the necessary portion of the pipe with a burner or the like.
According to this piping structure, there is a problem in that work is not easy because pipe connection and pipe bending require a lot of labor and time, and the accuracy of the bending angle of the pipe cannot be ensured.

In the first and second piping structures, since the workability is poor as described above, a flexible corrugated pipe made of thermoplastic resin is often used recently.
In other words, it is necessary to unwind the corrugated pipe wound in a coil shape, straighten it in the straight pipe section, and to bend the corrugated pipe appropriately in the bent pipe section so that the bent shape is maintained. This part is fixed to a wall, ceiling surface, ceiling back member, or other appropriate support member by a saddle, a suspension bolt, or other appropriate stoppers.
The corrugated tube refers to a tube having an independent parallel corrugated shape along the outer peripheral direction of the tube (bellows shape) or a spiral corrugated shape on the outer peripheral surface.

FIG. 8 shows a basic example of a pipe structure of a protective pipe such as a cable exposed to a wall surface using a flexible corrugated pipe.
The flexible corrugated tube 2 unwound from the coil and cut to a predetermined length is straightened and arranged along the vertical direction (or horizontal direction) to the straight piping part a on the wall surface, and the fastener 4 ( For example, the corrugated tube 2 is fixed to the wall surface at a predetermined interval (usually 1500 mm or less) by a saddle. In the bent pipe part b, the flexible corrugated pipe 2 is bent by a necessary amount (for example, 90 °), and both ends of the bent part are fixed to the wall surface by the fasteners 4 so that the bent shape is maintained.
The flexible corrugated pipe 2 unwound from the coil is stretched linearly as described above in connection with the piping. However, due to the contraction accompanying the winding of the coil, the straight pipe portion a is located between the adjacent fasteners 4. In many cases, curved portions 2a and 2a of "S-shape" or "K-shape" remain.

  If the bent portion 2a remains in this way, the passage resistance increases when a flexible cable (not shown) is passed along the direction of arrow A. Further, in each bent portion 2a, the force of the line concentrated at the tip of the cable first acts in the direction of increasing the curvature of the bent portion 2a (the direction approaching a straight line), and then decreases the curvature of the bent portion 2a. Therefore, the corrugated tube 2 moves to the left and right in the figure, making it difficult to connect the corrugated tube. This tendency becomes prominent in proportion to the increase in the number of bent pipe portions b in the middle.

If the clasps 4 are more densely installed, it is possible to prevent the corrugated pipe 2 from moving during wiring as described above even if the bent portion 2a disappears or remains, but the increase in the clasps 4 and the number of pipings are increased. Since the cost of piping increases due to an increase in the number of bolts, there is a limit to densely installing the fasteners 4.
Therefore, if the bent pipe portion b of 90 °, for example, is at a predetermined position or more in the middle of the pipe length, it is necessary to pass a call wire for passing through in advance. However, even if there is a difference, the bent portion 2a. The situation of this will not change, so it will take time to pass the call wire.
In addition, as described above, if the bent portion 2a is formed in the area of the straight piping in the exposed piping portion that occupies most of this type of piping structure, the appearance is impaired, and therefore, it may be the object of a complaint from the owner. There is sex.
Furthermore, when a pipe is inserted into a narrow space as a concealed pipe, such as in the back of a ceiling or in a fixed lightweight partition, and the pipe is straight, the tip of the flexible pipe hangs down due to curl or gravity, so the area around the pipe space It often takes time to work on existing piping and other existing equipment.

An object of the present invention is to improve the workability of a straight pipe portion into a protective pipe, to improve the appearance of an exposed pipe portion, and to improve the pipe workability.
An object of the present invention is to provide a piping structure for a protective pipe such as a cable, which can smoothly and easily carry out a wiring operation and is preferable in appearance.
Another object of the present invention is to provide a piping structure for a protective tube such as a cable that can perform piping work easily and efficiently when piping in a straight line to a narrow straight space such as a piping in an exposed piping region and a concealed piping region. Is to provide.
Still another object of the present invention is to provide a piping method for a protective pipe such as a cable, which can more smoothly implement a piping structure for achieving the above object.

In order to solve the above-mentioned problem, the piping structure for a protective tube such as a cable according to the present invention includes a non-flexible linear corrugated pipe made of a thermoplastic synthetic resin and a thermoplastic synthetic resin arranged in a bent pipe section. The main feature is that the end portion of the flexible corrugated pipe is connected by a pipe joint, and at least the linear corrugated pipe is fixed to a wall, a floor, a pillar, or other peripheral members.
In this specification and claims, the term “inflexibility” means that it does not have flexibility or is poor in flexibility (usually it cannot be bent easily with only human arm strength).

  In order to solve the above problems, one of the piping methods for protective pipes such as cables according to the present invention is that the straight piping is possible when the straight piping portion and the bent piping portion are adjacent to each other along the piping length direction. A non-flexible linear corrugated pipe made of a thermoplastic synthetic resin to the section, and a thermoplastic synthetic resin cut to a predetermined length at the end of the straight corrugated pipe on the bent pipe section side The main feature is that it includes a step of connecting one end of the flexible corrugated tube.

  Another one of the piping methods according to the present invention corresponds to the straight pipe portion when the straight pipe portion and the bent pipe portion are adjacent to each other along the pipe length direction in order to solve the problem. One end of a flexible corrugated tube made of a thermoplastic synthetic resin cut to a length corresponding to the bent pipe portion is connected to an end portion of a non-flexible linear corrugated tube made of a thermoplastic synthetic resin having a length. In addition, the main feature is that it includes a step of piping the straight corrugated pipe to the straight pipe section and piping the flexible corrugated pipe to the bent pipe section.

According to the piping structure of the protective pipe for cables and the like according to the present invention, the pipe to be piped to the straight pipe portion is a non-flexible straight wavy pipe, and therefore the wiring work can be performed extremely smoothly and easily. At the same time, there is no bent part and the appearance is good.
Even when piping to a linear space such as the back of a ceiling or a lightweight partition, even if there are existing equipment in the vicinity of the space, the straight corrugated tube has excellent linearity, so it can be smoothly inserted into the space. And can be plumbed.
In addition, since the pipes connecting the ends are corrugated pipes, the pipe workability can be dramatically improved by the fact that they can be easily and quickly connected by a pipe joint and the pipes do not need to be bent when hitting the pipes. To improve. This makes it possible to shorten the piping period and further reduce the piping cost, not only for small-scale construction but also for piping construction of large-scale structures such as new construction and renovation.

  According to the piping method of the protective pipe for cables and the like according to the present invention, the piping structure according to the present invention can be smoothly implemented.

Hereinafter, an optimum embodiment of a piping structure for a protective pipe for cables and the like according to the present invention will be described with reference to the drawings.
First Embodiment FIG. 1 is a partial sectional view showing a first embodiment in which the piping structure according to the present invention is applied to indoor piping, FIG. 2 is an enlarged sectional view of part A in FIG. 1, and FIG. 3 is in the embodiment in FIG. It is a partial expanded half section view of the connection part by a pipe joint.

The wall surface of the vertical wall 60 made of one reinforced concrete of the indoor 6, the ceiling surface of the ceiling 61 made of reinforced concrete that is continuous with the vertical wall 60, and the vertical lightweight partition wall that is continuous with the ceiling 61 and faces the vertical wall 60. The hollow portions of the (hollow) 62 are straight piping portions a. A corner portion between adjacent vertical pipe portions a is a bent pipe portion b.
A box (connection box) 5 is installed on the wall surface of the vertical wall 60, and a box (switch box) 5 a is installed inside the lightweight partition wall 62 so as to be exposed to the indoor 6 side.

In the straight pipe portion a of the vertical wall 60, non-flexible straight corrugated pipes 1 and 1 made of thermoplastic synthetic resin cut to a required length are provided along the vertical direction at the upper and lower portions of the box 5, respectively. Are arranged.
These linear corrugated pipes 1 and 1 are fixed in a state where their corresponding ends are connected to the box 5 by the connecting tool 3a. It is fixed to the wall.

In the straight piping portion a of the lightweight partition wall 62, a similar non-flexible linear wavy tube 1 having a length necessary to face each straight wavy tube 1 of the vertical wall 60 is vertically arranged. Has been.
The straight corrugated tube 1 is fixed with its lower end connected to the corresponding box 5a by the connector 3a, and its upper end portion is fixed to the inner wall of the lightweight wall 62 by the stopper 4. Yes.

The straight pipe part a of the ceiling 61 is in a state of being substantially orthogonal to each other through the respective bent pipe parts b corresponding to the upper ends of the vertical straight corrugated pipes 1 and 1 on both sides where both ends have already been piped. A non-flexible linear corrugated pipe 1 having a required length made of a thermoplastic synthetic resin is disposed. At least portions near both ends of the straight corrugated tube 1 are fixed to the surface of the ceiling 61 by the stoppers 4.
In addition, the linear corrugated pipe | tube 1 arrange | positioned at each one linear piping part a is not restricted to one, but several short linear corrugated pipe | tubes 1 so that the full length of the said linear piping part a may be met. The case where it connects and uses it linearly by the pipe joint 3 etc. which are mentioned later is also included.

Thermoplastic cut in the bent pipe portions b, b between the ceiling 61 and the vertical wall 60 and between the ceiling 61 and the lightweight partition wall 62 so as to correspond to the pipe length of the bent pipe portion b. The flexible corrugated pipes 2 and 2 made of synthetic resin are arranged in a state bent at about 90 °.
Each end of the flexible corrugated pipes 2 and 2 is connected to a corresponding end of the corresponding linear corrugated pipe 1 by a pipe joint 3.
In this embodiment, each flexible corrugated tube 2 is bent so that its radius of curvature R is approximately six times (6D) the inner diameter D of the corrugated tube 2 as shown in FIG. This is preferable in terms of the balance between the smoothness of the wire work and the piping space of the corrugated pipe 2.

  In the piping structure of this embodiment, as shown in FIG. 2, each fastener 4 is a U-shaped main body 40 that holds the straight corrugated pipes 1 and 1 in a hug shape and has flange portions at both ends. And each screw nail (bolt) 42 for fixing each flange portion to the wall surface.

In this embodiment, each linear corrugated tube 1 and each flexible corrugated tube 2 is a corrugated tube having a bellows-like independent wave, but one or a plurality of spiral continuous waves are used. A corrugated tube can be used. That is, both the straight corrugated tube 1 and the flexible corrugated tube 2 can be formed as a spiral corrugated tube, or either the straight corrugated tube 1 or the flexible corrugated tube 2 is formed into a spiral shape. A corrugated tube may be used, and the other may be a corrugated independent wave corrugated tube. In this case, the structure of the joint also needs to be different between the portion corresponding to the spiral corrugated tube and the portion corresponding to the corrugated tube having an independent wave shape. Can be used.
Each of the corrugated pipe 1, corrugated pipe 2 and each pipe joint 3 is a thermoplastic composition having flame retardancy or flame resistance (which means that the fire extinguishes naturally within a certain time when the combustion flame disappears). Molded with resin.
The straight corrugated pipe 1 and the flexible corrugated pipe 2 enable the use of the pipe joint 3 having the same structure as described later, for example, in each part, and can be molded using the same mold. The shape and dimensions of the outer periphery are designed to be approximately equal or approximate.

In this embodiment, the material of each linear corrugated tube 1 and each flexible corrugated tube 2 is high density polyethylene having flame resistance, rigidity, impact resistance, weather resistance and electrical properties (electrical insulation). ing.
Each trough thickness of the straight corrugated tube 1 is 1.8 times or more of each trough thickness of the flexible corrugated tube 2 (in this embodiment, when both nominal diameters of the tubes are 22φ, the latter is 0 .7 to 0.8 mm, the former is at least 1.3 to 1.44 mm or more), but one corrugated tube 1 has no flexibility or is not flexible. On the other hand, the other corrugated tube 2 is so flexible that it can be easily bent by a human hand.
In order to make one corrugated tube 1 non-flexible and the other corrugated tube 2 flexible, the corrugated tubes 1 and 2 are made of different materials. What is necessary is just to design so that what multiplied the intensity | strength of each trough part thickness of the corrugated pipe 1 to 1.8 times or more of what multiplied the intensity | strength of each trough part thickness of the other corrugated pipe 2.
Each straight corrugated tube 1 is formed such that the crest inner diameter is smaller than the trough outer diameter (so that each crest is solid), so that the difference between the maximum inner diameter and the minimum inner diameter is small (this In the embodiment, it is formed to be about 1 mm or less.

The configuration of the pipe joint 3 is not particularly limited, but, for example, the following configuration may be used in order to be able to use the simplicity of operation when connecting the pipes and the wave shape of the corrugated pipes 1 and 2. preferable.
As shown in FIG. 3, the pipe joint 3 includes a cylindrical main body 30 having a ring-shaped stopper 30 a in the center portion of the inner peripheral surface and male thread portions on the outer periphery of both ends, and a cylindrical shape set on both ends of the main body 30. Each chuck ring 31 and each tightening cylinder 32 screwed to the outer periphery of both ends of the main body 30 in a state where the chuck ring 31 corresponding to the inner peripheral portion is locked.

Each chuck ring 31 has a large number of inward claw pieces 31a having flexibility in the inner and outer peripheral directions in a set state at the end of the main body 30 at predetermined intervals in the outer end partial circumferential direction, and corresponds to the outer peripheral portion. And a protruding portion that is locked to the inner peripheral portion of the tightening cylinder 32.
Each tightening cylinder 32 has a female threaded portion 32a that fits with the male threaded portion of the main body 30 on the inner periphery of one end, and also engages the protrusion of the chuck ring 31 with the inner periphery of the proximal end of the male threaded portion 32a. It has a stop 32b, and has a fastening portion 32c that fastens the inward claw piece 31a in the inner circumferential direction to the other end.

With the above configuration, each clamping cylinder 32 is screwed to both ends of the main body 30 as shown in the figure, and one end of the pipe joint 3 is aligned with the corresponding end of one corrugated pipe 1 in this state. When pressed into the press-fitted state, each inward claw piece 31 a of the chuck ring 31 of the portion is hooked to the trough portion of the end portion of the corrugated tube 1, and the pipe joint 3 is fixed to the end portion of the corrugated tube 1. When the end portion of the other corrugated tube 2 is pushed in from the other end portion of the pipe joint 3, each inward claw piece 31a of the end portion is hooked to the corresponding two trough portions, and both corrugated tubes 1, The two ends are connected to each other.
On the other hand, when each tightening cylinder 32 is loosened to the limit in the detaching direction, each inward claw piece 31a of the chuck ring 31 at each corresponding end of the pipe joint 3 is loosened so as to open in the outer circumferential direction. 1 and 2 can be pulled out from the pipe joint 3.

In the piping structure of the embodiment, the bending angle of the flexible corrugated pipe 2 is not 90 ° but may be bent to other angles, or may be bent to an S-shape or other forms. The piping state of 1 is not always vertical or horizontal.
Further, when there are two bent portions of the flexible corrugated tube 2, the boundary portion of each bent portion is fixed to the wall surface or other peripheral members by the fastener 4.

One preferred piping method when the straight piping part a and the bent piping part b are adjacent to each other along the pipe length direction as in the above embodiment is a non-flexible linear shape to the straight piping part a. In this method, the corrugated pipe 1 is piped, and one end of the flexible corrugated pipe 2 cut to a predetermined length is connected to the end of the straight corrugated pipe 1 on the bent pipe portion b side.
When the piping configuration of FIG. 1 is implemented by this piping method, for example, from the side of one box 5 toward the other box 5a (or in the opposite direction), a non-flexible linear corrugated tube 1 is used. And flexible corrugated pipe 2 are connected while being alternately connected. Alternatively, the straight corrugated pipe 1 is piped to each straight pipe section a, the flexible corrugated pipe 2 corresponding to each bent pipe section b is disposed, and the ends of the adjacent straight corrugated pipes 1 are arranged. It will be connected to the corresponding end.

Another one of the piping methods is a flexible cut to a length corresponding to the bent piping part b to the end of the straight corrugated pipe 1 having a non-flexibility of the length corresponding to the straight piping part a. In this method, one end of the corrugated pipe 2 is connected, the straight corrugated pipe 1 is piped to the straight pipe section a, and the flexible corrugated pipe 2 is piped to the bent pipe section b.
When implementing the piping configuration of FIG. 1 by this piping method, the corresponding end of the flexible corrugated tube 2 corresponding to one end of the straight corrugated tube 1 is connected. And each linear corrugated pipe | tube 1 is fixed to the corresponding straight piping part a, and the other edge part of each flexible corrugated pipe | tube 2 is connected to the corresponding edge part of the linear corrugated pipe | tube 1 corresponding to the said edge part. Will do.

  In the piping structure of the first embodiment, when a cable (not shown) is routed, after piping in the state shown in the figure, each box 5 or 5a is opened, and one box 5 (or 5a) to the other box. Connect in the direction of 5a (or 5).

According to the piping structure of the first embodiment, each of the straight corrugated pipes 1 has no flexibility or is not flexible enough to maintain a straight line state, so that the wiring work can be smoothly and efficiently performed. it can. Each of the straight corrugated pipes 1 has a good appearance because there is no room for irregular bends during piping. Since a flexible pipe is used for the bent pipe portion b, the bent state can be freely selected, and since bending is not required, the pipe can be easily and quickly piped, and the pipe efficiency is improved.
Since the straight corrugated tube 1 and the flexible corrugated tube 2 have substantially the same or approximate shapes and dimensions of their outer peripheral portions, both pipes having substantially the same outer diameter and different wall thickness are extruded by the same mold. Can do.
Further, if the straight corrugated tube 1 and the flexible corrugated tube 2 are made of the same material and the thickness of the groove portion of the straight corrugated tube 1 is 1.8 times or more than the thickness of the flexible corrugated tube 2, By making the groove strength considering the typical wall thickness 1.8 times or more, the straight corrugated tube 1 does not have flexibility or poor flexibility, and the other corrugated tube 2 has flexibility. Can be molded as follows.
The straight corrugated tube 1 is formed such that the inner diameter of the crest of the tube is smaller than the outer diameter of the trough, thereby reducing the difference between the maximum inner diameter and the minimum inner diameter.

Second embodiment (line test)
FIG. 4 is a partial schematic view showing a piping structure of a second embodiment piped for conducting a line test in the piping structure according to the present invention.
In this piping structure, a pipe in which a predetermined number of non-flexible linear corrugated pipes are connected at four different positions is arranged, and between the pipes connecting the four linear corrugated pipes, approximately 90 °. The flexible corrugated pipes 2 bent in a straight line are arranged in three locations so as to alternately connect them one by one. The connecting corrugated pipes and the respective flexible corrugated pipes 2 are Both ends are connected to corresponding ends of a connecting pipe made of the straight corrugated pipe 1 by a pipe joint 3.
Each flexible corrugated pipe 2 is bent so that the radius of curvature (R = 6D) thereof is substantially equal to one of the flexible corrugated pipes 2 in the horizontal direction and the other two in the vertical direction. The whole constitutes a piping route bent in a three-dimensional direction. In addition, a predetermined number of straight pipes are connected to straight pipes, and the number of pipes to be connected varies depending on the scale of the straight pipe, but may be any number, and a plurality of straight pipes may be connected. Alternatively, it may be constituted by one without being connected. Therefore, in the present invention, the connected pipe includes one straight pipe that is not connected. The total length of the piping route may be designed to be 20 to 30 m. The ends of the straight corrugated pipes 1 at both ends in the piping route are connected to the boxes 5 by the connecting tool 3a.
For example, when a corrugated pipe having a nominal diameter of 22φ to 28φ is used and the straight corrugated pipe 1 having excellent linearity of the pipe structure according to the present invention is used as the pipe route structure as described above, The cable can be smoothly routed without using a call wire.

As a comparative example, a pipe structure configured in the same manner as the pipe structure of the second embodiment except that a flexible corrugated pipe was used was prototyped (comparative example pipe structure).
Using the same cable, a line test (single line) was performed in which a line was passed from one box 5 side to the other box 5a side without using a call wire. In the piping structure of the second embodiment using the straight corrugated pipe 1, the straight pipe section does not meander and the rigidity of the pipe is high even if the cable and the pipe come into contact with each other. Since blurring is unlikely to occur, it was possible to pass through the entire length, but in the comparative example piping structure, after reaching the third bent piping part from one side, it became impossible to pass.
It is clear that this difference depends on whether or not the straightness of the pipe material in the straight pipe portion is maintained.

Third Embodiment FIG. 5 is a partial front view showing another form of a pipe structure connected to a box such as a connection box or a switch box attached to a wall surface, and FIG. 6 is a connection part between the corrugated pipe and the box. FIG.

The vicinity of the lower surface of the box (connection box) 5 attached to the wall surface is a bent pipe part b because it is necessary to separate the vertical pipes from each other at the lower part for some reason.
Therefore, the upper ends of the flexible corrugated pipes 2 and 2 are connected to the lower surface side of the box 5 facing the bent pipe part b by the connecting tool 3a.
Non-flexible straight corrugated pipes 1 and 1 are piped substantially vertically at a distance wider than the gap between the flexible corrugated pipes 2 and 2 in the straight pipe section a adjacent to the lower side of the bent pipe section b. The corresponding flexible corrugated pipes 2 and 2 are connected to the upper ends of the straight corrugated pipes 1 and 1 by the pipe joints 3 while being bent in a direction to widen the interval.

On the other hand, since the side surface side of the box 5 is a straight pipe portion a, non-flexible straight corrugated pipes 1, 1 are piped almost horizontally in the portion, and the straight corrugated pipes 1, 1 The end portions are respectively connected to the side surfaces of the box 5 by the connection tool 3a.
Cables or the like (not shown) that are routed into the corrugated pipes 1 and 2 that are piped and connected in the vertical direction are cables that are routed to the corresponding corrugated pipes 1 that are piped in the horizontal direction. Etc. in the box 5.

Each connector 3a is preferably configured as follows.
As shown in FIG. 6, each connector 3 a includes a cylindrical main body 33 having a tubular bolt part 33 a protruding to one side of the flange part 33 b at one end, and a chuck ring set at the other end of the main body 33. 34 and a fastening cylinder 35 screwed to the outer periphery of the other end of the main body 33 in a state where the chuck ring 34 is locked to the inner periphery.

The chuck ring 34 has a large number of inward claw pieces 34a having flexibility in the inner and outer peripheral directions in a set state at the end of the main body 33 at a predetermined interval along the outer end partial circumferential direction. It has a protrusion that is locked to the inner periphery of the corresponding tightening cylinder 35.
The tightening cylinder 35 has a female screw portion 35a that fits with the male screw portion of the main body 33 on the inner periphery of one end portion, and a latch that locks the protruding portion of the chuck ring 34 on the inner periphery of the proximal end portion of the male screw portion 35a. It has a piece 35b and a fastening portion 35c for fastening the inward claw piece 34a to the other end portion in the inner circumferential direction.
Reference numeral 37 denotes a cap that is pushed to close from the inside of the box 5 to the connector 3a when the line is not connected.

In order to connect the corrugated tube 2 (1) to the box 5, first, the tubular bolt portion 33 a of the main body 33 is inserted into the hole 50 formed in the side wall of the box 5 from the outside, and the tubular bolt portion that has entered the inside 5 of the box. The main body 33 is fixed to the box 5 by screwing the nut 36 to 33a.
When the tightening cylinder 35 is screwed and the end of the corrugated tube 2 (1) is pushed into the chuck ring 34 at the outer end of the connector 3, the corrugated tube 2 (1) reaches the peak on the outer periphery of the end. The chuck ring 34 is hooked on the inward claw piece 34 a and the end of the corrugated tube 2 (1) is fixed to the box 5 in a connected state.
Since the other structure and effect of 3rd Embodiment are the same as that of the piping structure of 1st Embodiment, those description is abbreviate | omitted.

It is a fragmentary sectional view showing a 1st embodiment which applied a piping structure concerning the present invention to indoor piping. It is an enlarged view of the A section of FIG. It is a partial expanded half section view of the connection part of corrugated pipes in the piping structure of a 1st embodiment. It is a partial schematic diagram which shows the piping structure of 2nd Embodiment piped in order to perform the wire-line test of this invention. It is a partial front view of the piping structure of 3rd Embodiment which connected and connected to connection boxes, such as a wall surface. It is a partial expanded half sectional view of the connection part of a corrugated pipe and a box. It is a schematic diagram which shows the relationship between the curvature radius of a flexible corrugated pipe, and the internal diameter of the said corrugated pipe. It is a partial front view which shows an example of the conventional piping form.

Explanation of symbols

1 Straight corrugated pipe 2 Flexible corrugated pipe 3 Pipe joint 3a Connector 4 Stopper 5 Box

Claims (11)

A non-flexible linear corrugated pipe made of a thermoplastic synthetic resin and an end portion of a flexible corrugated pipe made of a thermoplastic synthetic resin arranged in a bent pipe section are connected by a pipe joint, and at least the straight line Piping structure for protective pipes such as cables, in which corrugated pipes are fixed to walls, floors, pillars and other peripheral members. 2. The piping structure of a protective pipe for a cable according to claim 1, wherein the material of the straight corrugated pipe and the flexible corrugated pipe is a thermoplastic synthetic resin having flame resistance or flame resistance. The piping structure for a protective pipe for a cable or the like according to claim 1 or 2, wherein the straight corrugated pipe has a crest inner diameter smaller than a trough outer diameter. The linear corrugated tube and the flexible corrugated tube have a shape and dimensions of their outer peripheral portions that are substantially equal to or approximate to each other. Piping structure. The straight corrugated tube and the flexible corrugated tube are made of the same material, and the trough thickness of the straight corrugated tube is 1.8 times or more the trough thickness of the flexible corrugated tube. 4. Piping structure of the protective pipe for cables as described in 4 above. The linear corrugated tube and the flexible corrugated tube are different materials, and the product of the linear corrugated tube multiplied by the strength of the trough thickness multiplied the strength of the trough thickness of the flexible corrugated tube. The piping structure of a protective tube for a cable or the like according to claim 4, wherein the piping structure is 1.8 times or more than that of the cable. When the straight pipe portion and the bent pipe portion are adjacent to each other along the pipe length direction, a non-flexible straight corrugated pipe made of a thermoplastic synthetic resin is piped to the straight pipe portion, and the straight line A protective tube for cables, etc., comprising a step of connecting one end of a flexible corrugated pipe made of a thermoplastic synthetic resin cut to a predetermined length to an end of the corrugated pipe on the side of the bent pipe Piping method. When the straight pipe portion and the bent pipe portion are adjacent to each other in the pipe length direction, the end of the non-flexible straight corrugated pipe made of the thermoplastic synthetic resin having a length corresponding to the straight pipe portion. One end of a flexible corrugated pipe made of a thermoplastic synthetic resin cut to a length corresponding to the bent pipe section is connected to the section, the straight corrugated pipe is piped to the straight pipe section, and the bent pipe A method for piping a protective tube such as a cable, comprising a step of piping the flexible corrugated tube to a section. The end of a non-flexible linear corrugated pipe made of thermoplastic synthetic resin with excellent linearity is connected to the end of a flexible corrugated pipe made of thermoplastic synthetic resin placed in a bent pipe section by a pipe joint. The cable is connected to a pipe having a piping structure in which the straight corrugated pipe is fixed to a wall, a floor, a pillar, or other peripheral members, and the cable is connected to a protective pipe such as a cable. Connection method. A pipe with a predetermined number of non-flexible straight corrugated pipes connected to four different positions, and a flexible wave bent approximately 90 ° between the pipes connecting the four straight corrugated pipes. A pipe in which attached pipes are alternately arranged at three locations so as to connect them one by one, and the pipe ends connected to each other by pipe joints are piped in a three-dimensional direction as a whole to a total length of about 20 to 30 m. A cable connection method to a three-dimensional piping route of a protective tube such as a cable, characterized in that, in a piping structure in which a box is connected to both ends of the route, the cable is routed without calling. 11. A straight corrugated pipe used in the cable passing method to the three-dimensional piping route according to claim 10.

Images