JP2020002984A - Square conduit pipe, laying structure of linear conduit line, laying structure of conduit line, laying method of conduit line, and laying method of laminated conduit line of square conduit pipe - Google Patents

Abstract

To provide a square conduit pipe which is easy in opening and closing when inserting a cable into the pipe, excellent in transportability and workability, and enabled in an adjacence arrangement and multistage lamination, a layer structure of a linear conduit line using the same, a laying structure of a conduit line, and a laying method of the conduit line.SOLUTION: In a square conduit pipe 1, a large-diameter part 3 and a small-diameter part 5 are alternately formed in a longitudinal direction. The large-diameter part 3 is substantially square, and the small-diameter part 5 is substantially circular at cross sections vertical to a longitudinal direction. An open slit 7 continuing to the longitudinal direction is formed at the square conduit pipe 1. A slit 11 is formed on an extension line of the open slit 7, and at least at a part of the small-diameter part 5 at the other side face 17b opposing a side face 17a. A heavy thickness portion of the large-diameter part 3 of the side face 17b which is not cut by the slit 11 is a connection part 9 of the slit. In a cross section of the square conduit pipe 1 vertical to the longitudinal direction, the open slit 7 is formed on a center line M parallel with a bottom face 13 of the square conduit pipe 1, or at an upper part of the center line.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rectangular conduit for protecting electric wires, a laying structure of a straight conduit, a laying structure of a conduit using the same, a method of laying a conduit, and a method of laying a stacked conduit of a rectangular conduit. .

  For example, as a wire protection tube for underground burial used in a civil engineering construction site, a round wire tube having a circular cross section has been proposed. When laying an electric wire or the like, the electric wire or the like is inserted into a conduit. Since the conduit is tubular, it is necessary to feed the electric wires sequentially from the end in order to insert the electric wires into such a tubular member, but this operation has not always been easy.

  On the other hand, there is a method in which a slit is formed in a part of a conduit along a longitudinal direction to form an opening, and an electric wire is inserted from the opening. In this case, it is not necessary to feed the electric wire in the longitudinal direction, so that the workability is good.

  As such a conduit, for example, along the longitudinal direction of the tubular body, in parallel with the pipe axis, a notch formed by forming a notch and a notch, and a straight line connecting the notch and the notch is formed by an electric wire. There has been proposed a tubular body that is formed offset (shifted by a predetermined distance) from the center of the tube (Patent Document 1).

  In the conduit of Patent Document 1, when closing the split after storing the cable, a long arc having a cut cross section is more flexible than a short arc. It is possible to easily superimpose, and it is possible to eliminate the gap at the split part.

  In addition, a ridge and a valley are continuous in the longitudinal direction, and the shape of the ridge is a substantially rectangular rectangular conduit, and two separate portions are provided in the conduit in the longitudinal direction to form two independent divided bodies. There has been proposed a conduit which can be used by superposing them (Patent Document 2).

  In the conduit tube of Patent Literature 2, after electric wires and cables are placed inside, the divided bodies are combined. In this state, the divided bodies can be fixed to each other by the substantially C-shaped holder.

  In addition, a hinge portion is provided at one position of the cross section of the corrugated conduit, and a cut portion is provided at the other position. There has been proposed a conduit which extends in the longitudinal direction and a joint used for the conduit (Patent Document 3).

  In the conduit tube of Patent Literature 3, a cable placed on the ground can be sandwiched from above and stored in a state where the hinge portion is arranged on the upper side.

  Further, two shells each having an opening and having a substantially arc-shaped cross section are arranged to face each other via a hinge portion, and after one of the two shells is expanded in diameter while passing the maximum diameter of the other shell. A tubular cable protection tube having a reduced diameter and capable of housing the other shell inside one shell has been proposed (Patent Document 4).

  In Patent Literature 4, when the inner shell is put on the outer shell, the inner shell having a larger diameter is reduced in diameter and inserted into the outer shell having a smaller diameter, so that the inner shell after fitting is restored when the inner shell is restored. A strong fitting structure can be obtained by elastic repulsion.

JP-A-2002-369363 JP 2004-248364 A JP 2006-141099 A Japanese Patent Publication No. 2009-542180

  However, since the conduit of Patent Literature 1 has a circular cross section, a space is required on both sides of the conduit when a split is opened to insert an electric wire into the conduit. Therefore, when a plurality of conduits are installed side by side, if the cross section is circular, it is difficult to arrange the conduits in contact with each other without leaving a gap. There was a problem.

  Further, the conduit tube of Patent Document 1 has a structure in which a notch portion is arranged near the ground, and a cable is inserted into a wire protection tube by opening a smaller circular arc laterally from the center of the notch portion. Therefore, if gravel or the like exists on the ground, the conduit may not be able to be opened. Further, when opening the short arc side when opening the conduit, the conduit may rotate with respect to the installation surface due to the reaction, and the conduit may be further displaced. For this reason, since it is necessary to open both the long and short arcs by pressing them, the workability is poor. In addition, when both the long arc and the short arc are pressed and expanded, the conduit width of the conduit increases at the time of the expansion, and it is difficult to arrange the two conduits adjacent to each other. Further, since there is a notch near the ground, it is difficult to open the conduit greatly, and it is impossible to insert a plurality of wires or cables having a large diameter into the conduit.

  In addition, when two divided bodies are used as in Patent Literature 2, it is necessary to align both ends in the longitudinal direction of the divided bodies, and the installation is troublesome. Similarly, at the time of transportation, both ends of the two divided bodies need to be transported while overlapping each other. Furthermore, in order to prevent displacement of the upper and lower divided bodies due to vibration, etc., and to prevent the mutually overlapped divided bodies from being blown off by wind, etc., to prevent rain from entering the inside of the conduit, It is necessary to fix the two divided bodies with a special fixing tool, and it takes time to perform the construction.

  Further, the fixture for closing and fixing the two divided bodies is disposed at an angle of more than 180 ° in the circumferential direction around the outer circumference of the conduit when attached. Further, since the electric conduit and the fixture have a substantially circular cross section, they cannot be used by stacking electric conduits or arranging electric conduits facing each other.

  Further, since the conduit of Patent Document 3 is provided with a hinge portion, the conduit can be easily opened and closed, and the cable can be easily stored in the cable protection tube. The left and right corrugated portions formed on both sides of the hinge portion must be opened. For this reason, after laying one conduit, arranging the electric wire in another conduit, closing the opening, and then arranging the conduits in two rows or a plurality of examples unless they are lifted and moved. Can not do it. In practice, it is considered possible to insert a single wire into a small-diameter conduit, but it is practically impossible to insert a large-diameter wire from the opening with the opening facing downward. Impossible.

  Further, in the conduit of Patent Document 4, an opening slit is provided in a conduit having a circular cross section to facilitate opening of the conduit, and a hinge portion is further provided at a position facing the opening, so that the electric wire to be stored is stored. However, there is a possibility that an electric wire may be placed on both sides of the hinge part over the hinge part. For this reason, the electric wire placed inside the electric conduit causes the electric conduit to be heavy, and it is difficult to close the opening of the electric conduit.

  The present invention is not able to arrange a plurality of conduits adjacent to each other in a conventional conduit with a slit having a circular cross section used in a civil engineering construction site, so that the stability and workability of the conduit when the slit is opened are poor. This is a rectangular conduit that is easy to open and close when inserting a cable inside, has excellent transportability and workability, and can be arranged adjacently and stacked in multiple layers. It is an object of the present invention to provide a laying structure of a straight pipeline, a laying structure of a pipeline, a method of laying a pipeline, and a method of laying a stacking pipeline of a rectangular conduit.

  In order to achieve the object described above, a first invention is a rectangular conduit in which large-diameter portions and small-diameter portions are alternately formed, and in a cross section perpendicular to the longitudinal direction, the large-diameter portion has a substantially square shape. The small-diameter portion is substantially circular, and the rectangular conduit is provided with an opening slit that is continuous in the longitudinal direction of the rectangular conduit. The opening slit has one side surface of the rectangular conduit as an opening end, and the opening slit is formed. A slit is formed on at least a part of the small-diameter portion on the other side surface facing the one side surface, and the other side surface becomes a connection portion of the slit, and the opening slit is a rectangular electric wire. Formed on or above the center line parallel to the bottom surface of the pipe, when opening the opening slit, a part of the rectangular conduit may open without protruding outward from the one side. What is possible A rectangular conduit characterized. In the present invention, a substantially square shape includes a shape having a ratio of a long side to a short side of about 1.2: 1.

  The opening slit may be provided substantially parallel to the bottom surface at a position separated by a predetermined distance above a center line parallel to the bottom surface of the rectangular conduit.

    The opening slit is on a center line parallel to the bottom surface of the rectangular conduit or above the center line, from an end of the opening slit on the one side surface toward a connection portion of the slit with respect to the bottom surface. It may be formed diagonally below.

  The opening size of the opening of the small diameter portion when the opening slit is opened may be formed to be equal to or less than the diameter of the small diameter portion and to be equal to or greater than 80% of the diameter of the small diameter portion.

  The rectangular conduit may be obtained by cutting the male fitting portion or the female fitting portion formed at either the front end portion or the rear end portion in the tube axis direction. Alternatively, a long body having a predetermined length in which the male fitting portion or the female fitting portion is not formed may be cut.

  The material used for the rectangular conduit is preferably high-density polyethylene.

  In addition, the resin material may include, in addition to the high-density polyethylene, a total of 4 parts or less of either a rubber component or a thermoplastic elastomer, and may further include a lubricant of 3 parts or less.

  According to the first invention, since the large diameter portion of the conduit has a square shape, it is easier to arrange the product more stably than a corrugated conduit having a circular or spiral cross section. In addition, since the large-diameter rectangular portion has a large amount of protrusion from the small-diameter portion having a circular cross section, the effect of protecting the electric wire is large. Furthermore, since the base tube of the rectangular conduit is extruded into a straight tube at a predetermined length, it is less likely to meander than a conduit having a circular cross section, and even when the conduit is opened, the cross section of the conduit is not circular. Since the opening can be provided at a predetermined position, it is difficult to roll.

  In addition, by adopting a structure in which the opening slit is provided, the small-diameter portion having a circular cross-sectional shape is divided by the opening slit into two, a lower small-diameter portion in the vertical direction and an upper small-diameter portion. At this time, the wires and cables can be placed from above on the arc-shaped small-diameter portion on the lower side only by expanding the opening above the opening slit of the rectangular conduit. Further, after placing the electric wire or cable on the small diameter portion, the upper part of the expanded rectangular conduit is simply closed so as to contact the lower part, and the rectangular conduit can be easily stored in the rectangular conduit.

  In addition, since the installation stability with respect to the ground is sufficiently ensured in the large diameter portion of the rectangular conduit, the wires and cables can be stably placed on the lower small diameter portion. Also, at this time, even if the wires and cables are placed diagonally on the lower small-diameter portion, the rectangular conduit does not move because the bottom surface of the large-diameter portion is stably installed on the ground. . Also, unlike a round corrugated conduit with a circular cross section, in the case of a rectangular conduit, the large-diameter portion projects more than the smaller-diameter portion, and after storing the wires and cables, the upper part of the rectangular conduit is placed on the lower side. Since electric wires and cables can be stored simply by closing the portion, a fixture for the opening is not required.

  Even when two rectangular conduits are placed in close contact with the opening ends of the opening slits facing each other and in contact with each other, even when the rectangular conduit is opened, the opening side of the upper portion of the rectangular conduit is connected to each other. Is moved in a direction to escape to the side opposite to the opening end, and a portion of the rectangular conduit can be opened without protruding outward from the side surface on the opening side. For this reason, it is possible to closely arrange the two rectangular conduits before laying the electric wires. Therefore, stable laying is possible even in a narrow space on the ground.

  In particular, if the opening slit is provided at a position separated by a predetermined distance above a center line parallel to the bottom surface of the rectangular conduit and substantially parallel to the bottom surface, the storage space on the lower side can be enlarged. Further, the weight of the lower conduit can be relatively increased, and the conduit can be more stabilized when the electric wire is inserted therein.

  Moreover, when opening the upper part of the opening slit of the rectangular conduit, the amount of protrusion of the upper lid part from the side of the large diameter portion at the time of opening can be reduced. Therefore, workability at the time of laying an electric wire in a rectangular conduit is improved, and it is possible to install the rectangular conduit in a place where the installation space is small such as the side of a track in a station yard.

  The same effect can be obtained even when the opening slit (slit opening end) is formed obliquely downward from the opening end of one side on the center line parallel to the bottom surface of the rectangular conduit. Can be obtained.

  Further, when the opening slit is disposed above the center line parallel to the bottom surface, the opening dimension of the small-diameter portion when the opening slit is opened is smaller than the inner diameter of the small-diameter portion, and the inner diameter of the small-diameter portion is reduced. 80% or more, it is possible to secure an opening width when inserting an electric wire. For this reason, the work of inserting the electric wire into the conduit tube is easy.

  In addition, for example, when cutting a conduit having a fitting portion at the front and rear ends of a conduit having a slit, a male mold formed at one of the front end and the rear end in the tube axis direction of the rectangular conduit. It is also possible to cut and manufacture the fitting part or the female fitting part.

  A second invention is a pipeline laying structure using the rectangular conduit according to the first invention, wherein each of the plurality of rectangular conduits has an electric wire or cable laid therein. The side faces of the rectangular conduits are brought into contact with each other, and the open ends of the opening slits of the conduits of the respective rectangular conduits are arranged in the same direction. Structure.

  According to the second invention, even when a plurality of rectangular conduits are provided side by side, when the rectangular conduit is opened, the end face on the opening side moves in a direction to escape to the side opposite to the opening end, It does not protrude from the side surface on the opening end side. For this reason, if the openings are sequentially laid in the same direction, even if a plurality of rectangular conduits are arranged in contact with each other, the insertion work of the electric wires and the like is easy. Therefore, stable laying is possible even in a narrow space on the ground.

  A third invention is a pipeline laying structure using the rectangular conduit according to the first invention, wherein a plurality of the rectangular conduits are each provided with an electric wire or cable laid therein. The side faces of the rectangular conduits are brought into contact with each other, the opening ends of the opening slits of the conduits of the respective rectangular conduits are arranged in the same direction, and the plurality of rectangular conduits are arranged in the same direction. A straight pipeline laying structure characterized in that an opening end of an opening slit and an opening end of an opening slit of another rectangular conduit are arranged to face each other.

  According to the third invention, the same effect as that of the second invention can be obtained, and the square electric conduit arranged last is arranged so that the opening slit faces the existing rectangular electric conduit. Even when the rectangular conduit is opened, the end surface on the opening side moves in a direction to escape to the side opposite to the opening end. For this reason, since the end surface on the opening side does not protrude from the side surface on the opening end side, a plurality of rectangular conduits can be arranged in contact with each other.

  A fourth aspect of the present invention is a pipe laying structure characterized by having a bent portion that is continuous with the straight pipe laying structure according to the second invention.

  According to the fourth aspect, it is possible to obtain a conduit in which the straight portion and the bent portion are continuous.

  A fifth invention is a method of laying a conduit using the rectangular conduit according to the first invention, wherein the conduit comprises a bent portion and a straight portion, and the conduit of the first rectangular conduit is After arranging the open end of the opening slit toward the outside of the bent portion and laying an electric wire or a cable inside the rectangular conduit, along the inside of the bent portion of the first rectangular conduit. In addition, the open end of the opening slit of the second rectangular conduit is disposed in close contact with the first rectangular conduit toward the outside of the bent portion, and the second rectangular conduit is disposed. A method of laying a pipeline characterized by laying an electric wire or a cable inside the pipe.

  The arrangement of the rectangular conduit may be repeated plural times. Furthermore, as the arrangement of the rectangular conduits, the first stage may be stacked according to the above-described method, and then the second and subsequent stages may be sequentially stacked in the same manner.

  The pipes of the plurality of rectangular conduits laid by the above-described pipe laying method may be fixed by a belt-shaped fixing member.

  According to the fifth aspect, a plurality of rectangular conduits can be easily provided side by side. For example, when two rectangular conduits are closely arranged, a laying structure including a straight portion and a bent portion is considered. In this case, if an attempt is made to open the opening slit of the bent portion in order to arrange the wires and cables, the direction in which the radius of curvature of the conduit increases in the opposite direction to the curvature at which the conduit is arranged when the opening slit is expanded. The reaction force of bending back that changes to In this case, if the openings of the conduits are opposed to each other, the reaction force of the conduit on the side where the opening ends are oriented toward the center of the radius of curvature of the bending increases.

  In addition, in order to stably arrange the bent portions of the two rectangular conduits substantially in parallel, it is necessary to arrange the opening slits in the bent portions of each rectangular conduit toward the outside of the bent portions. At this time, when the opening slits of the two rectangular conduits are both arranged toward the outside of the bend and are closely attached to each other, when the rectangular conduit is opened, the upper part of one of the rectangular conduits is located at the side position. More than inside the bend. For this reason, even when these two rectangular conduits are in close contact with each other, at the time of opening, they are separated from each other by an amount protruding from the upper part.

  On the other hand, in the case where two rectangular conduits are laid so as to include a bent portion and a straight portion, in the fifth invention, instead of arranging two rectangular conduits at the same time, the first rectangular After placing the conduit with the opening end of the opening facing the outside of the bend and laying wires and cables inside the conduit, the second rectangular conduit is replaced with the first rectangular electric wire. Lay it inside the bend of the pipe. In this way, the two rectangular conduits can be laid in contact with each other.

  It is also possible to repeat such operations further, and to install third and fourth rectangular conduits inside the bent portion in order.

  Furthermore, after laying the plurality of rectangular conduits including the bent portion, the plurality of rectangular conduits are fixed with a fixing member such as Insulok (registered trademark), so that the arranged rectangular conduits can be mutually fixed. .

  It is necessary that the radius of curvature of the innermost layer of the rectangular conduit at the bend is larger than the minimum bending radius of the electric cable accommodated therein and the minimum bending radius of the rectangular conduit.

  ADVANTAGE OF THE INVENTION According to this invention, it is easy to open and close when inserting a cable into an inside, it is excellent in portability and workability, and it can be arranged adjacently and can be stacked in multiple stages. It is possible to provide a structure and a laying structure of a pipeline, a laying method of a pipeline, and a laying method of a stacking pipeline of a square conduit.

FIG. 1 is a front view showing a rectangular conduit tube 1. FIG. 2 is a plan view showing the rectangular conduit tube 1. (A) is a left view which shows the rectangular conduit 1, and (b) is a right view which shows the rectangular conduit 1. FIG. FIG. 2 is a sectional view taken along line AA of FIG. 1. FIG. 3 is a sectional view taken along line BB of FIG. 2. The side view which shows the state which opened the rectangular conduit tube 1. FIG. (A)-(c) is a top view which shows the manufacturing process of the rectangular conduit tube 1. FIG. (A)-(c) is a top view which shows the laying process of the rectangular conduit tube 1. FIG. (A)-(c) is a top view which shows the laying process of the rectangular conduit tube 1. FIG. (A)-(c) is a top view which shows the laying process of the rectangular conduit tube 1. FIG. 3A and 3B are diagrams illustrating a rectangular conduit tube 40, wherein FIG. 3A illustrates a closed state, and FIG. 3B illustrates an open state. 3A and 3B are diagrams illustrating a rectangular conduit tube 40, wherein FIG. 3A illustrates a closed state, and FIG. 3B illustrates an open state.

  Hereinafter, a rectangular conduit tube 1 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing the rectangular conduit 1, FIG. 2 is a plan view showing the rectangular conduit 1, and FIG. 3 (a) is a left side view showing the rectangular conduit 1, and FIG. FIG. 2B is a right side view showing the rectangular conduit tube 1. FIG. 4 is a sectional view taken along line AA of FIG. 1, and FIG. 5 is a sectional view taken along line BB of FIG. The right side view showing the rectangular conduit 1 appears symmetrically with the left side view. The bottom view and the back view of the rectangular conduit tube 1 are the same as the plan view.

  In the rectangular conduit 1, large-diameter portions 3 and small-diameter portions 5 are alternately formed in the longitudinal direction. In a cross section perpendicular to the longitudinal direction, the large-diameter portion 3 is substantially rectangular, in most cases a square shape, and the small-diameter portion 5 is substantially circular. In addition, the diameter (length of one side) of the large diameter portion 3 is larger than the outer diameter of the small diameter portion 5. Thus, by providing the large-diameter portion 3 having a substantially square shape, when the rectangular conduits 1 are stacked, the rectangular conduits 1 can be stably arranged.

  The rectangular conduit tube 1 is provided with an opening slit 7 that is continuous in the longitudinal direction. As shown in FIG. 3, the opening slit 7 has an opening end on one side surface 17 a of the rectangular conduit tube 1. In addition, a slit 11 is formed in the small diameter portion 5 of the other side surface 17b facing the side surface 17a on an extension of the opening slit 7. The slit 11 is formed so as to cut a part of the large-diameter portion 3 and the small-diameter portion 5 from the inside of the rectangular conduit tube 1 except for the thickness of the side surface 17 b of the large-diameter portion 3. That is, the thick portion of the large-diameter portion 3 on the side surface 17b that is not cut by the slit 11 becomes the connecting portion 9 of the slit.

  Here, in a cross section perpendicular to the longitudinal direction of the rectangular conduit 1, the opening slit 7 is formed on the center line M parallel to the bottom surface 13 of the rectangular conduit 1, or on the upper side (upper surface 15 side). . In the illustrated example, the opening slit 7 is provided substantially parallel to the bottom surface 13 at a position spaced a predetermined distance above a center line M parallel to the bottom surface 13 of the rectangular conduit tube 1.

  Here, the upper surface 15 side of the line connecting the opening slit 7 and the slit 11 is defined as the lid portion 21, and the bottom surface 13 side of the line connecting the opening slit 7 and the slit 11 is defined as the main body portion 19. The lid 21 can be opened and closed with respect to the main body 19 starting from the connection part 9 of the slit.

  FIG. 6 is a diagram showing a state in which the rectangular conduit tube 1 is opened. As described above, in the cross section perpendicular to the longitudinal direction of the rectangular conduit tube 1, the slit 11 and the connection portion 9 of the slit are arranged substantially on the extension of the opening slit 7. Further, the opening slit 7 is arranged substantially in the same straight line as a straight line parallel to the bottom surface 13 passing through the connection portion 9 of the slit.

  Here, a line E in the figure indicates a locus passing through the outermost periphery when the lid 21 is opened from the opening slit 7. By preventing the opening end of the opening slit 7 from being lower than a straight line parallel to the bottom surface 13 passing through the connecting portion 9 of the slit, the rectangular conduit 1 Can be opened without protruding outward (to the right in the figure) from the side surface 17a on the opening end side. Therefore, even if another rectangular conduit or another structure contacts the side surface 17a, the lid 21 can be easily opened.

  The opening dimension (D in the figure) of the small-diameter portion 5 when the lid 21 is opened from the opening slit 7 is equal to or smaller than the inner diameter (C in the figure) of the small-diameter portion 5 and the inner diameter of the small-diameter portion 5 (C in the figure). It is desirable that it is formed to 80% or more of C). If the opening size of the small diameter portion 5 is too small, it becomes difficult to insert an electric wire or the like into the inside of the main body 19, and it becomes impossible to insert a thick electric wire or the like.

  The resin material used for the rectangular conduit 1 is desirably high-density polyethylene. Further, the material used for the rectangular conduit tube 1 may include a rubber component or a thermoplastic elastomer in addition to high-density polyethylene in a total of 4 parts or less, and may further include a lubricant in 3 parts or less. As described above, by including the rubber component, the thermoplastic elastomer, or the lubricant in a predetermined amount or less, the opening of the opening slit is easily opened, and even when the opening slit is repeatedly opened a plurality of times, the connection portion of the slit is damaged. Can be prevented. As the rubber component or the thermoplastic elastomer and the lubricant, any materials may be used as long as they are basically known materials. However, if necessary, a small amount of a dispersant, a compatibilizer, and the like can also be added.

  Next, a method for manufacturing the rectangular conduit tube 1 will be described. FIG. 7A is a diagram illustrating the rectangular conduit tube 10. The rectangular conduit 10 is formed, for example, by blow molding. In the rectangular conduit tube 10, the large diameter portions 3 and the small diameter portions 5 are alternately formed in the longitudinal direction. At this time, the rectangular conduit 1 may be formed into a predetermined length and wound up, or may be extruded linearly in the longitudinal direction, and the male fitting portion 23 is provided at one end thereof, and the other end is provided. A female fitting portion 25 may be provided at the end. Alternatively, a long body having a predetermined length in which the male fitting portion or the female fitting portion is not formed may be cut.

  The male fitting portion 23 and the female fitting portion 25 have shapes that can be fitted to each other. That is, the male fitting portion 23 and the female fitting portion 25 have a shape that matches the shape of the other rectangular conduit 10 or any one of the male fitting portion 23 and the female fitting portion 25. It becomes a fitting part with a pipe joint.

  First, the male fitting portion 23 of the rectangular conduit 10 is cut at the cutting portion F, and the female fitting portion 25 is cut at the cutting portion G. The illustrated example shows an example in which the male fitting portion 23 and the female fitting portion 25 are provided at both ends of the rectangular conduit 10, but only one of the male fitting portion 23 and the female fitting portion 25 is provided. In some cases, a mating portion 25 is provided. In this case, the male fitting portion 23 or the female fitting portion formed at either the front end portion or the rear end portion of the rectangular conduit 10 in the tube axis direction. The part 25 may be cut.

  Next, as shown in FIGS. 7 (b) and 7 (c), a cutting blade is inserted from the side surface 17a of the rectangular conduit tube 10 whose both ends are cut toward the opposite side surface 17b, and the opening slit is formed. It forms (H in the figure). At this time, a cutting blade is inserted from the side surface 17a to form the opening slit 7, and at the same time, except for the thickness of the large diameter portion 3 on the side surface 17b, a part of the large diameter portion 3 on the side surface 17b and the small diameter portion 5 are formed. Is cut to form the slit 11 and the connecting portion 9 of the slit. As described above, the rectangular conduit tube 1 in which the opening slits 7 and the slits 11 are formed in the longitudinal direction is formed.

  Next, a method of laying the rectangular conduit 1 will be described. FIG. 8A is a diagram showing a pipe laying structure using the rectangular conduit tube 1a. The rectangular conduit 1a described below has the same structure as the rectangular conduit 1 described above.

  First, as shown in FIG. 8A, a first rectangular conduit tube 1a is laid. In the illustrated example, the conduit of the rectangular conduit tube 1a has the straight portion 27 and the bent portion 29, but the bent portion 29 is not always necessary. In the following description, a pipeline in which the bent portion 29 is not provided will be referred to as a straight pipeline. That is, the illustrated pipe laying structure has a bent portion 29 that is continuous with the straight pipe laying structure. The first rectangular conduit tube 1a is arranged with the opening end of the opening slit 7 facing outward of the bent portion 29.

  Next, the lid 21 is opened from the opening slit 7 of the rectangular conduit tube 1a. FIG. 8B is a diagram showing a state in which the lid 21 is opened in a cross section taken along line II of FIG. 8A. The arrow J in FIG. 8B indicates the outside of the bend of the bent portion 29, and the arrow K indicates the inside of the bend of the bent portion 29. The same applies hereinafter unless otherwise specified. That is, the lid 21 is opened toward the inside of the bend from the opening slit 7 arranged on the outside of the bend.

  Next, the electric wire 31 (or cable) is laid inside the rectangular conduit tube 1a. The electric wire 31 is arranged from above the main body 19 inside the small-diameter portion 5 that is opened by opening the lid 21. At this time, since the main body 19 is larger than the lid 21, the position and the posture are stabilized by the weight. Moreover, since the opening width of the upper part of the small diameter part 5 by the lid part 21 is 80% or more with respect to the inner diameter of the small diameter part 5, the electric wire 31 can be easily inserted inside.

  After inserting the electric wire 31, as shown in FIG. 8C, by closing the lid 21, a conduit in which the electric wire 31 is laid is formed.

  Next, as shown in FIG. 9A, the second rectangular conduit 1b is closely contacted with the first rectangular conduit 1a along the inside of the bent portion 29 of the first rectangular conduit 1a. Place. The rectangular conduit 1b has the same structure as the rectangular conduit 1 and the like. At this time, the opening end of the opening slit 7 of the rectangular conduit tube 1b is arranged outward of the bent portion 29. That is, the plurality of rectangular conduits 1a and 1b are arranged such that the opening ends of the opening slits 7 of the respective conduits face in the same direction.

  FIG. 9B is a diagram showing a state in which the lid 21 of the rectangular conduit tube 1b is opened in a cross section taken along line LL of FIG. 9A. As in the above-described process, the lid 21 of the rectangular conduit 1b is opened, and the electric wire 31 (or cable) is inserted into the second rectangular conduit 1b from above. When opening the lid 21 of the rectangular conduit 1b, the lid 21 does not protrude to the side surface 17a on the opening end side of the rectangular conduit 1b. Therefore, the lid 21 of the rectangular conduit 1b can be opened while the side surface 17a of the rectangular conduit 1b is in contact with the side 17b of the rectangular conduit 1b.

  Next, the lid 21 of the rectangular conduit tube 1b is closed. In this way, the plurality of rectangular conduits 1a and 1b contact the side surfaces 17b and 17a of the respective rectangular conduits 1a and 1b with the electric wires 31 (or cables) laid inside. Thus, the pipe laying structure 33 can be obtained. At this time, the opening ends of the opening slits 7 of the conduits of the respective rectangular conduits 1a and 1b are arranged in the same direction. By repeating the above steps and repeatedly arranging the rectangular conduits a plurality of times, any number of rectangular conduits can be juxtaposed with their side surfaces in contact with each other. Alternatively, the first stage may be stacked according to the method, and the second and subsequent stages may be sequentially stacked in the same manner to form a stacked conduit for the rectangular conduit.

  In the case of a laying structure of a straight conduit having no bent portion 29, it is not always necessary that all the opening ends of the opening slits 7 of all the rectangular conduits have the same direction. FIG. 10A is a diagram showing a pipeline laying structure 33a.

  In the illustrated example, the square conduits 1a, 1b, and 1c are laid in order. By laying in this order, when the rectangular conduit 1b is laid and the lid 21 is opened, the rectangular conduit 1c is laid without interference with the rectangular conduit 1a. When opening 21, there is no interference with the rectangular conduit tube 1b. Thereafter, when a rectangular conduit is further provided next to the rectangular conduit 1c (on the right side in the figure), similarly, when the lid 21 of the rectangular conduit to be laid last is opened, the rectangular electric conduit is also opened. There is no interference with the rectangular conduit 1c laid immediately before that is placed in contact with the pipe.

  On the other hand, of the plurality of existing rectangular conduits 1a, 1b, and 1c, the first rectangular conduit 1a at one end side (the left side in the drawing) in the direction in which the conduits are laid is brought into contact with the first rectangular conduit 1a. When the rectangular conduit tube 1d is provided in parallel, the opening end of the opening slit 7 of the rectangular conduit tube 1d and the opening end of the opening slit 7 of the rectangular conduit tube 1a provided are arranged so as to face each other.

  In this case, the lid 21 of the rectangular conduit 1d does not protrude to the side surface 17a on the opening end side of the rectangular conduit 1d when opened. Therefore, the lid 21 of the rectangular conduit 1d can be opened with the side surface 17a of the rectangular conduit 1d in contact with the side surface 17a of the rectangular conduit 1a. Further, as shown in FIG. 10 (a), the laying structure in which four rectangular conduits are provided side by side is shown. Since the connection portion is disposed, it is possible to dispose the entire outer peripheral portion in a closed state, so that dust, dust and the like hardly enter the inside of the rectangular conduit.

  FIG.10 (b) is a figure which shows the laying structure 33a of the pipeline in the state which laid the electric wire 31 inside the rectangular conduit tube 1d. In the state where a plurality of rectangular conduits are provided in parallel, for example, when a rectangular conduit is further added to the rectangular conduit 1c side, the opening ends of the opening slits 7 of the rectangular conduit are also provided. It is sufficient that the rectangular conduit tube 1c is disposed in the same direction as the opening end of the opening slit 7 of the rectangular conduit tube 1c. Similarly, in a state where a plurality of rectangular conduits are provided side by side, for example, when further adding a rectangular conduit to the rectangular conduit 1d side, the opening end of the opening slit 7 of the rectangular conduit is provided. It may be arranged in the same direction as the opening end of the opening slit 7 of the rectangular conduit tube 1d.

  In addition, as shown in FIG. 10C, a plurality of rectangular conduits may be fixed by a belt-shaped fixing member 35 in a state where a plurality of rectangular conduits are provided side by side. As the fixing member 35, for example, a binding band such as Insulok (registered trademark) can be used. FIG. 10C shows a case where the large-diameter portion 3 is fixed by the fixing member 35, but the small-diameter portion 5 may be fixed instead of the large-diameter portion 3, and either the large-diameter portion 3 or the small-diameter portion 5 is used. May be fixed.

  As described above, according to the present embodiment, since the large-diameter portion 3 of the rectangular conduit 1 is a substantially square-shaped conduit, the rectangular conduits 1 can be stacked in multiple steps and have a circular or spiral cross section. The square conduit can be easily arranged as compared to the corrugated conduit described in US Pat.

  In addition, the rectangular conduit tube 1 is hard to roll when installed on the ground or the like, and is stable. Therefore, for example, when the cover portion 21 is opened and the electric wire 31 is inserted into the inside, displacement and the like hardly occur. In particular, since the opening slit 7 is provided at a position separated by a predetermined distance above a center line M parallel to the bottom surface 13 of the rectangular conduit tube 1 and substantially parallel to the bottom surface 13, The weight of the portion 19 is increased, and the portion 19 can be arranged more stably.

  Further, even when the opening slit 7, the slit 11, and the connection portion 9 of the slit are offset upward with respect to the center line M, the opening width of the small diameter portion 5 above the main body portion 19 is smaller than that of the small diameter portion 5. By arranging the opening slit 7 and the like so as to be 80% or more of the inner diameter, there is no hindrance to the work of inserting the electric wire 31 into the inside.

  In addition, since the opening slit 7, the slit 11, and the connecting portion 9 of the slit are provided in parallel with the bottom surface 13 of the rectangular conduit 1, when the opening slit 7 is opened, the lid 21 is closed by the opening of the rectangular conduit 1. It does not protrude outward from the end side surface 17a. Therefore, even when another rectangular conduit or the like is provided on the open end side of the rectangular conduit 1, the lid portion 21 can be opened and the electric wire 31 can be inserted therein.

  For example, by arranging the second rectangular conduit 1b so that the opening end of the opening slit 7 faces in the same direction so as to contact the side surface 17b side of the existing first rectangular conduit 1a, When the electric wire 31 is inserted into the inside of the rectangular conduit 1b, the work can be performed without the lid 21 of the rectangular conduit 1b interfering with the rectangular conduit 1a. In the case of a laying structure of a straight conduit, another rectangular conduit 1d is arranged so that the opening ends of the opening slits 7 face each other so as to contact the side surface 17a side of the rectangular conduit 1a. Thus, when the electric wire 31 is inserted into the rectangular conduit 1d, work can be performed without the lid 21 of the rectangular conduit 1d interfering with the rectangular conduit 1a.

  In the case of the laying structure including the linear portion 27 and the bent portion 29, when the opening slit 7 of the bent portion 29 is to be opened, a reaction force acts in a direction opposite to the opening direction. The opening slit 7 can be easily opened by arranging the 7 toward the outside of the bent portion 29. When a plurality of the rectangular conduits 1 are arranged in close contact with the respective opening slits 7 toward the outside of the bent portion 29, when one rectangular conduit is opened, the lid portion 21 is positioned on the side of the other rectangular conduit. Protrude into. For this reason, it is necessary to arrange two rectangular conduits at a predetermined distance from each other. However, instead of arranging two rectangular conduits at the same time, the first rectangular conduit 1a is disposed with the opening end of the opening slit 7 facing the outside of the bent portion 29, and the electric wire 31 is disposed inside. After laying, the second rectangular conduits 1b are laid in such a manner that the second rectangular conduits 1a and 1b are brought into contact with each other so that the second rectangular conduits 1b are juxtaposed according to the curvature inside the bent portion 29 of the rectangular conduit 1a. can do. On the other hand, in the case of a corrugated pipe in which both the large-diameter portion and the small-diameter portion form a slit having a circular cross section, when a plurality of corrugated pipes are juxtaposed, the slit of the conduit is inserted when inserting an electric wire or a cable. In order to open the corrugated pipes, it is necessary to arrange the corrugated pipes apart from each other by an amount corresponding to the opening allowance when the corrugated pipes are opened.

  Further, when a plurality of rectangular conduits 1 are provided side by side, by fixing the whole of the rectangular conduits 1 provided side by side by the fixing member 35, a more stable conduit laying structure can be obtained.

  Next, another embodiment of the rectangular conduit will be described. FIG. 11A is a diagram illustrating a rectangular conduit tube 40. In the following description, components having the same functions as those of the rectangular conduit 1 are denoted by the same reference numerals as those in FIGS. 1 to 10 and the like, and redundant description will be omitted.

  The rectangular conduit 40 has substantially the same configuration as the rectangular conduit 1, except for the arrangement of the opening slit 7, the slit 11, and the connection portion 9 of the slit. In the rectangular conduit 40, the opening slit 7, the slit 11, and the connecting portion 9 of the slit are arranged in a straight line on a center line M parallel to the bottom surface 13. That is, the lid 21 and the main body 19 are formed symmetrically with the same size.

  FIG. 11B is a diagram illustrating a state where the lid 21 of the rectangular conduit tube 40 is opened. Thus, even when the opening slit 7, the slit 11, and the connecting portion 9 of the slit are arranged on the center line M parallel to the bottom surface 13, when the lid 21 is opened, a part of the lid 21 It does not protrude from 17a.

  FIG. 12A is a diagram illustrating a rectangular conduit tube 40a. In the rectangular conduit 40a, the opening slit 7 is formed obliquely upward from the one side surface 17b on the center line M parallel to the bottom surface 13 of the rectangular conduit 40a. That is, the connection part 9 of the slit is disposed on the center line M parallel to the bottom surface 13 of the rectangular conduit tube 40a, and the slit 11 and the opening slit 7 are disposed obliquely upward (on the upper surface 15 side) in a straight line. You.

  Also in this case, it is desirable to set the inclination of the slit 11 and the opening slit 7 so that the opening width of the small-diameter portion 5 above the main body 19 is 80% or more of the inner diameter of the small-diameter portion 5. For example, the formation angle of the slit 11 and the opening slit 7 is desirably formed on a straight line having a range of more than 0 ° and a maximum of 30 ° with respect to a direction parallel to the bottom surface 13.

  FIG. 12B is a diagram illustrating a state in which the lid 21 of the rectangular conduit tube 40a is opened. Thus, even when the opening slit 7, the slit 11, and the connecting portion 9 of the slit are arranged on the center line M parallel to the bottom surface 13, when the lid 21 is opened, a part of the lid 21 It does not protrude from 17a.

  As described above, the embodiments of the present invention have been described with reference to the accompanying drawings. However, the technical scope of the present invention is not affected by the above-described embodiments. It is obvious that a person skilled in the art can conceive various changes or modifications within the scope of the technical idea described in the claims, and these naturally fall within the technical scope of the present invention. It is understood to belong.

1, 1a, 1b, 1c, 1d, 10, 40, 40a, 40b ... Square conduit 3 ... Large diameter section 5 ... Small diameter section 7 ... Opening slit 9 ... Connection part of slit 11 Slit 13 Bottom surface 15 Top surface 17a, 17b Side surface 19 Body portion 21 Cover portion 23 Male fitting portion 25 Female fitting portion Joint 27 Linear part 29 Bent 31 Electric wires 33 and 33a Pipe laying structure 35 Fixing member

Claims (14)

A rectangular conduit in which a large diameter portion and a small diameter portion are alternately formed,
In a cross section perpendicular to the longitudinal direction, the large diameter portion is substantially square, the small diameter portion is substantially circular,
The rectangular conduit is provided with an opening slit that is continuous in the longitudinal direction of the rectangular conduit,
The opening slit has one side surface of the rectangular conduit as an opening end, and is formed on an extension of the opening slit, and a slit is formed in at least a part of the small diameter portion of the other side surface facing the one side surface. Thus, the other side surface becomes a connection portion of the slit,
The opening slit is formed on or above a center line parallel to the bottom surface of the rectangular conduit, and when the opening slit is opened, a part of the rectangular conduit is located more outward than the one side surface. A rectangular conduit tube capable of being opened without protruding.   2. The rectangular conduit according to claim 1, wherein the opening slit is provided at a position separated by a predetermined distance above a center line parallel to the bottom surface of the rectangular conduit, and substantially parallel to the bottom surface. 3.   The opening slit is on a center line parallel to the bottom surface of the rectangular conduit or above the center line, from an end of the opening slit on the one side surface toward a connection portion of the slit with respect to the bottom surface. The rectangular conduit according to claim 1, which is formed obliquely downward.   The opening dimension of the opening of the small-diameter portion when the opening slit is opened is formed to be equal to or less than the inner diameter of the small-diameter portion and equal to or greater than 80% of the inner diameter of the small-diameter portion. The rectangular conduit according to claim 3.   Either a male fitting part or a female fitting part formed at either the front end or the rear end in the tube axis direction of the rectangular conduit is cut off, or a male fitting part or a female fitting The rectangular conduit according to any one of claims 1 to 4, wherein a long body having a predetermined length in which no portion is formed is cut. A pipe laying structure using the rectangular conduit according to any one of claims 1 to 5,
A plurality of the rectangular conduits, with the wires or cables laid inside, contact the side surfaces of the respective rectangular conduits with each other to form the opening slits of the conduits of the respective rectangular conduits. The straight pipe laying structure, wherein the open ends are arranged in the same direction. A pipe laying structure using the rectangular conduit according to any one of claims 1 to 5,
A plurality of the rectangular conduits, with the wires or cables laid inside, contact the side surfaces of the respective rectangular conduits with each other to form the opening slits of the conduits of the respective rectangular conduits. The open ends are arranged in the same direction,
Laying a straight conduit, wherein the opening ends of the opening slits of the plurality of rectangular conduits in the juxtaposed direction and the opening ends of the opening slits of the other rectangular conduits are arranged to face each other. Construction.   A laying structure for a pipeline, comprising a bent portion that is continuous with the laying structure for a linear pipeline according to claim 6. A method for laying a conduit using the rectangular conduit according to any one of claims 1 to 4,
The conduit includes a bent portion and a straight portion,
After arranging the open end of the opening slit of the first rectangular conduit toward the outside of the bent portion and laying an electric wire or cable inside the rectangular conduit, the first rectangular Along the inside of the bent portion of the conduit, the opening end of the opening slit of the second rectangular conduit is placed in close contact with the first rectangular conduit toward the outside of the bent portion. And laying an electric wire or cable inside the second rectangular conduit tube.   The method for laying a conduit according to claim 9, wherein the arrangement of the rectangular conduit is repeated a plurality of times.   11. The rectangular electric wire according to claim 9, wherein the rectangular conduit is arranged such that the first stage is stacked according to the method of claim 9 or 10, and the second and subsequent stages are sequentially stacked in the same manner. A method of laying pipe stacking pipelines.   A method of laying a conduit, comprising fixing a plurality of rectangular conduits laid by the method of laying a conduit according to any one of claims 9 to 11 with a band-shaped fixing member.   The rectangular conduit according to any one of claims 1 to 5, wherein a material used for the rectangular conduit is high-density polyethylene.   14. The rectangular electric conduit according to claim 13, wherein the resin material further comprises a rubber component or a thermoplastic elastomer in addition to high-density polyethylene in a total of 4 parts or less and a lubricant in a total of 3 parts or less.

Images