JP2006158114A - Upper/lower divided type free access tube and its conduit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an upper/lower divided type free access tube and its conduit, capable of eliminating cutting of a lead-in cable and securing a space for passing the lead-in cable. <P>SOLUTION: In this upper/lower divided type free access tube, a separator 2 is inwardly provided over almost the total length of the free access tube 1, an in-tube upper space 3 more upper than the separator 2 is used as a space for passing the lead-in cable, an in-tube lower portion space 4 lower than the separator 2 is used as a space for passing a sheath for inserting the cable. Besides, the upper/lower divided type free access tube is connected to constitute the conduit. The space 3 for passing the lead-in cable and the space 4 for passing the sheath are separated into the upper/lower portions with the separator 2 sandwiched, therefore, the lead-in cable is not caught in the sheath to be cut at the time of leading in the lead-in cable, and it does not become difficult to secure the space for passing the lead-in cable due to irregular displacement at the bent portion of the free access conduit. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vertically divided type free access pipe used for a compact next-generation electric wire joint groove and a pipe line therefor.

  Since the conventional electric wire common groove is a large single tube assembly system for a wide sidewalk or the like, there is a problem that it cannot be embedded in a narrow sidewalk. Therefore, recently, the implementation of a compact next-generation electric joint groove in which a common free access pipe and a body pipe are vertically arranged so that it can be embedded in a narrow sidewalk has been considered.

  However, in the lower space in the common free access pipe of this next-generation type electric joint groove, a plurality of sheath pipes through which the cable is inserted are passed, and a plurality of cables drawn in to the customer are directly stacked on it. Therefore, when the retractable cable is retracted, the retractable cable may be sandwiched between the sheath tubes and cut. Further, at the bent portion of the free access conduit, the sheath tube is exposed and the arrangement is disturbed, so that it is sometimes impossible to secure a space through which the lead-in cable passes.

  The publicly known technical literature that tried to solve the problems related to the shared free access pipe for the next-generation electric joint groove as described above can be found because the implementation of the next-generation electric joint groove is very recent. There wasn't.

  The present invention has been made in order to address the above-described problem. As a first solution, the present invention provides a vertically divided type free access pipe that can eliminate the cutting of the lead-in cable and secure a space for the lead-in cable to pass through. Yes. And this free access pipe that includes the upper and lower split type free access pipes including the internal separator is connected without misalignment, and can be easily passed without damaging the lead-in cable or sheath pipe at the connection part or bent part. Providing is the second solution issue.

In order to solve the above problems, the vertically divided free access pipe according to the present invention includes a separator over the entire length of the free access pipe, and the upper space in the pipe above the separator is a space through which the lead-in cable passes. The lower space in the pipe below the separator is a space through which the sheath pipe for inserting the cable is passed.
The free access pipe according to the present invention includes a separator that extends over almost the entire length of the free access pipe, and the inside of the free access pipe is divided into a pipe upper space above the separator and a pipe lower space below the separator. It is characterized in that two or more divided free access pipes divided into upper and lower parts are connected, a lead-in cable is passed through the upper space in the pipe, and the cable is passed through the sheath pipe through the lower space in the pipe. .

  In the vertically divided free access pipe of the present invention and its pipe line, as the separator, the side plate portion is provided with curved side plate portions that contact the inner surface of the free access tube at both side ends of the flat plate portion. Is preferably fixed to the inner surface of the free access tube with a stopper, and in particular, a separator in which the side plate portions of the separator extend vertically from both side ends of the flat plate portion is suitably provided.

  In the free access pipe of the present invention, the other end of the next free access pipe is inserted and connected to a connection port formed at one end of the free access pipe, and the separator incorporated in the connected free access pipe It is preferable to connect the end portions of each through a separator connecting member. In that case, as the separator connecting member, use one having two connecting bars on the lower surface side along both side edges of the connecting plate, and both ends of the connecting bar protruding in the length direction from the connecting plate, It is preferable to connect the end portions of the separator via separator connecting members by inserting them into the cavity formed on the lower surface side along both side edges of the flat plate portion of the separator, and in particular, connecting the separator connecting members. A slit of a predetermined length is formed between the plate and the connection bar from both ends in the length direction of the connection plate. Both side edges of the flat plate portion of the separator are inserted into the slit, and both ends of the connection plate in the length direction are separated from the separator. It is more preferable to overlap the end portion of the flat plate portion. In addition, as the separator connecting member, at least one protruding strip having an inverted T-shaped cross section is formed on the lower surface of the connecting plate, and both ends of the protruding strip are formed at the end of the flat plate portion of the separator. The end portions of the separator are connected to each other by inserting the protruding strips into the slit from below so that both end portions in the length direction of the connecting plate that are inserted into the slits and overlapped with the end portions of the flat plate portions do not rise. It is also preferable to connect via a member.

  Furthermore, in the free access pipe of the present invention, the upper and lower split type free access pipes positioned at the bent portion of the pipe are connected to each other over almost the entire length of the free access pipe bent in an arc shape. It is preferable that a short separator is incorporated. As a short separator, a curved side plate that contacts the inner surface of the free access tube is formed on both side ends of the short flat plate portion, and a cavity is formed on the lower surface side along both side edges of the short flat plate portion. Preferably, it is preferable that a plurality of short separators are connected by a connecting belt inserted through the hollow portion. In particular, a short separator in which the side plate portion extends vertically from both side ends of the short flat plate portion is suitable.

  The vertically divided free access pipe according to the present invention and its pipe line are separated from a sheath pipe through which the cable is inserted and a cable drawn into the customer, and the cable drawn into the customer is placed in the upper space in the pipe above the separator. In order to pass the sheath pipe through the lower space in the pipe below the separator, it pulls in between the sheath pipe when pulling in the pull-in cable like the conventional shared free access pipe that passes the pull-in cable over the sheath pipe. The cable is not cut by being pinched, and the arrangement of the sheath tube is not disturbed at the bent portion of the free access conduit, so that it is not difficult to secure a space through which the lead-in cable passes. In particular, as a separator, a curved side plate that contacts the inner surface of the free access tube is formed on both side ends of the flat plate portion, and when this side plate is fixed to the inner surface of the free access tube with a stopper, the free access Since the mounting stability and fixing strength of the separator inside the pipe are improved, it is possible to reliably prevent troubles caused by the separator moving in the pipe when the sheath pipe or the lead-in cable is passed. In addition, when the side plate portion of the separator extends only downward from both side ends of the flat plate portion, the thin lead-in cable that passes through the upper side of the flat plate portion of the separator includes the side plate portion that extends downward and the inner surface of the free access pipe. However, if the separator has a side plate portion that extends vertically from both ends of the flat plate portion, the pull-in cable is free from the side plate portion by the side plate portion extending upward. It is possible to reliably prevent pinching between the inner surface of the access pipe and to eliminate the disconnection of the lead-in cable.

  Then, in the free access pipe of the present invention, the other end of the next free access pipe is inserted and connected to a connection port formed at one end of the free access pipe, and the end of the separator incorporated in the connected free access pipe Since parts connected to each other via a separator connecting member can be connected to the separator in the pipe as well as the free access pipe without causing displacement or twisting, damage to the lead-in cable or the sheath pipe at the connecting part It can be easily passed through without any problems. In that case, as the separator connecting member, use one having two connecting bars on the lower surface side along both side edges of the connecting plate, and both ends of the connecting bar protruding in the length direction from the connecting plate, If the separator is inserted into the cavity formed on the lower surface side along both side edges of the flat plate portion of the separator, the end portions of the separator can be connected easily and reliably so that the separator connecting member does not come off. In particular, a slit having a predetermined length is formed from both ends in the length direction of the connection plate between the connection plate of the separator connection member and the connection bar, and both side edges of the flat plate portion of the separator are inserted into the slit, When both end portions in the length direction are overlapped with the end portion of the flat plate portion of the separator, the connection can be made so that no gap is generated between the flat plate portion of the separator and the connection plate of the separator connecting member. In addition, as the separator connecting member, at least one protruding strip having an inverted T-shaped cross section is formed on the lower surface of the connecting plate, and both ends of the protruding strip are formed at the end of the flat plate portion of the separator. The separator connection member can be connected even when the ridges are engaged with the slits from below so that both ends in the length direction of the connection plate that are inserted into the slits and overlapped with the end portions of the flat plate portions do not float. It is possible to connect easily and reliably so that a gap does not occur between the plate and the flat plate portion of the separator or the separator connecting member does not come off.

  Furthermore, in the free access pipe of the present invention, a vertically divided type free access pipe positioned at the bent portion includes a plurality of short separators connected to each other over almost the entire length of the free access pipe bent in an arc shape. If it is an interior, such an arc-shaped vertically divided free access pipe can be manufactured easily and inexpensively, so that material costs and construction costs can be reduced. In particular, the short separator has curved side plate portions that contact the inner surface of the free access pipe at both side ends of the short flat plate portion, and a hollow portion is formed on the lower surface side along both side edges of the short flat plate portion. When a plurality of short separators are connected by a connecting belt inserted through the hollow portion, there is a degree of freedom that can be used for free access pipes with different radii of curvature, and the side plate portion can be freed with a stopper. There is an advantage that it can be fixed to the inner surface of the access pipe and stably installed. When the side plate portion of the short separator extends vertically from both side ends of the short flat plate portion, the thin lead-in cable is sandwiched between the side plate portion and the inner surface of the free access tube by the side plate portion extending upward. It can be reliably prevented and cutting of the lead-in cable can be eliminated.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of a vertically divided free access pipe according to an embodiment of the present invention, and FIG. 2 is a free access of the present invention constructed by connecting the free access pipe and a free access pipe bent in an arc shape. FIG. 3 is a longitudinal cross-sectional view of the free access pipe, FIG. 4 is a cross-sectional view taken along line AA of FIG. 3, and FIG. 5 is a perspective view of a separator of the free access pipe. 6 is a longitudinal sectional view of a connecting portion of the free access pipe, FIG. 7 is a perspective view showing an example of a separator connecting member, FIG. 8 is a partial perspective view explaining how to connect the separator by the separator connecting member, and FIG. Is a perspective view showing another example of the separator connecting member, FIG. 10 is a partial perspective view for explaining how to connect the separator by the separator connecting member, FIG. 11 is a sectional view taken along the line BB of FIG. 10, and FIG. Curved in an arc FIG. 13 is a perspective view showing a plurality of short separators connected to each other, and FIG. 14 is a perspective view of the short separator. is there.

  The vertically divided free access pipe shown in FIG. 1 is a straight synthetic resin free access pipe 1 in which a separator 2 is installed, and as shown in FIG. A space through which the lead-in cable 5 is passed, and a lower pipe interior space 4 below the separator is a space through which the sheath tube 7 for inserting the cable 6 is passed.

  As shown in FIGS. 1 and 3, one end of the free access pipe 1 is expanded in diameter by the thickness of the pipe to form a connection port 1a. As shown in FIG. The other end of the next free access pipe 1 is inserted and connected. In addition, a packing fitting groove 1b for fitting the waterproof packing 8 from the inner surface side is formed in the connection port 1a so as to bulge, and the waterproof seal 8 ensures the watertightness of the connection portion of the free access pipe. It has become so.

  The separator 2 is made of an extruded aluminum material, and as shown in FIGS. 4 and 5, extends on both sides of the flat plate portion 2 a in a curved upper and lower direction that contacts the inner surface of the free access tube 1. The side plate portions 2b and 2b are integrally formed, and further, rectangular tube-shaped hollow portions 2c and 2c are integrally formed on the lower surface side along both side edges of the flat plate portion 2a. Two slits 2d are formed in parallel at both ends in the length direction of the flat plate portion 2a. This slit 2d is necessary when the separators 2 are connected to each other using a separator connecting member 14 described later, but is not used when connecting the separators 2 using another separator connecting member 13 described later. Since it is necessary, it may be omitted.

  As shown in FIGS. 1 and 3, the separator 2 is built up over the entire length of the free access tube 1 except for the connection port 1a. As shown in FIG. 4, the side plate portions 2b, 2b is fixed to the inner surface of the free access tube 1 with rivets 9,9. When the side plates 2b and 2b of the separator 2 are fixed with the rivets 9 and 9 in this way, the mounting stability and fixing strength of the separator 2 inside the free access tube 1 are improved. When passing through the pipe upper space 3 above the portion 2a or when passing the sheath tube 6 through the pipe lower space 4 below the flat plate portion 2a, the separator 2 is reliably prevented from moving in the pipe and causing trouble. can do. When the side plate portions 2b, 2b of the separator 2 extend vertically from both side ends of the flat plate portion, the thin lead-in cable 5 is connected to the side plate portions 2b, 2b and the free access pipe 1 by the side plate portions 2b, 2b extending upward. It is possible to reliably prevent pinching between the inner surface and the disconnection of the lead-in cable 5.

  The separator 2 is not limited to an aluminum extrusion mold material, and may be formed by extruding a thermoplastic synthetic resin. The side plate portions 2b and 2b of the separator 2 may be fixed using a stopper other than the rivet 9. However, fixing with the rivet 9 is preferable because workability is good and sufficient fixing strength is obtained. Further, it is more preferable that the rivet 9 is waterproof since water can be prevented from entering the free access pipe 1.

  The free access pipe of the present invention connects two or more of the above straight upper and lower divided free access pipes 1 or, when there is a bent portion in the pipe, as illustrated in FIG. The straight upper / lower divided free access pipe 1 and the upper / lower divided free access pipe 10 bent in an arc shape are connected, and the free access pipes 1 and 10 are drawn into the upper space 3 in the pipe. In addition to passing the cable 5, the cable 6 is inserted into the sheath tube 7 through the sheath tube 7 into the lower space 4 in the tube. In FIG. 2, reference numeral 11 denotes a communication connection rod, 12 denotes a branch pipe attached to the free access pipe 1, and the lead-in cable 5 passed through the pipe upper space 3 of the free access pipe 1 is the above-described branch pipe. 12 is drawn into the consumer. Although not shown in FIG. 2, a body conduit is provided below the free access conduit.

  In the above-described free access pipe, the vertically divided free access pipes 1 and 1 are connected to each other by the connection structure shown in FIG. That is, the waterproof packing 8 is fitted into the packing fitting groove 1b of the connection port 1a at one end of the free access tube 1, and the other end of the next free access tube 1 is inserted into the connection port 1a to be watertight. At the same time, the end portions of the separators 2 and 2 housed in the free access pipes 1 and 1 are connected to each other via a separator connecting member 13.

  The separator connecting member 13 is a member made of aluminum or synthetic resin similar to the separator 2, and two connecting bars 13b and 13b are formed on the lower surface side along both side edges of the connecting plate 13a. Both end portions of the connection bars 13b and 13b protruding in the length direction from the connection plate 13a are processed into a tapered shape. A slit 13c having a predetermined length is formed between the connection plate 13a and the connection bars 13b and 13b from both ends in the length direction of the connection plate 13a, and the side plate rises from both side ends of the connection plate 13a. 13d and 13d are formed.

  As shown in FIG. 6 and FIG. 8, the end portions of the separator 2 are connected to both ends of the connection bar 13 b of the separator connecting member 13 into the square cylindrical cavities 2 c and 2 c of both separators 2 and 2. At the same time, both side edges of the flat plate portions 2a and 2a of the separators 2 and 2 are inserted into the slits 13c and 13c of the separator connecting member 13, and both end portions in the length direction of the connecting plate 13a of the separator connecting member 13 are This is done by overlapping the end of the flat plate portion 2a. In this way, the separators 2 and 2 can be connected easily and reliably via the separator connecting member 13, and the separators 2 and 2 may be misaligned, stepped, twisted, etc. There is no possibility of dropping off or generating a gap between the flat plate portion 2a of the separator and the connecting plate 13a of the separator connecting member. Therefore, the lead-in cable 5 and the sheath pipe 7 can be smoothly passed through the pipe line without being hooked or damaged at the connecting portion. When the side plates 13d and 13d rising from both side ends of the connection plate 13a are formed like the separator connection member 13, the rigidity and strength of the connection plate 13a are increased and the side plates 13d and 13d are thin. It is possible to reliably prevent the lead-in cable 5 from being sandwiched between the connection bar 13b and the inner surface of the free access pipe 1, and to eliminate the disconnection of the lead-in cable 5.

  Moreover, you may perform the connection of the edge parts of the separator 2 using the separator connection member 14 as shown in FIG. The separator connecting member 14 is a member made of aluminum or synthetic resin, and has two strips 14b, 14b having an inverted T-shaped cross section formed in parallel to each other on the lower surface of the connecting plate 14a. Side plates 14d and 14d are formed at both ends of the connection plate 14a. When the side plates 14d and 14d are formed in this manner, the rigidity and strength of the connection plate 14a are improved and the cutting of the lead-in cable can be eliminated as in the case of the separator connection member 13 described above. When the separators 2 and 2 are connected using such a separator connecting member 14, as shown in FIGS. 10 and 11, both ends of the protrusions 14 b and 14 b are connected to the slits 2 d and 2 d of both separators 2 and 2. The protrusions 14b and 14b are engaged with the slits 2d and 2d from below so that both end portions in the length direction of the connecting plate 14a overlapped with the end portions of the flat plate portions 2a and 2a of the separators 2 and 2 are not lifted. Thus, the end portions of the separators 2 and 2 can be connected easily and reliably. In addition, the protrusion 14b of the separator connection member 14 should just be formed at least 1 item | strip | row, and is not limited to 2 item | stripes. Further, the same number of slits 2d of the separator 2 are formed corresponding to the ridges 14b.

  As shown in FIG. 12, the vertical access type free access pipe 10 located at the bent portion of the free access pipe has a substantially entire length excluding the connection port 1a of the free access pipe 10 bent in an arc shape by 45 °. A plurality of (four in FIG. 12) short separators 20 connected to each other are internally provided, and the upper space in the pipe above the short separators 20 is used as a space through which a lead-in cable is passed to a consumer. The lower space in the pipe is a space through which the sheath pipe for inserting the cable is passed. The bend angle of the free access tube 10 is not limited to 45 °, and may be bent to 30 ° or 15 °, for example.

  Each of the short separators 20 has a structure in which the above-described separator 2 is cut short. As shown in FIG. 14, on both side ends of the short flat plate portion 20 a, a curved upper and lower sides that contact the inner surface of the free access tube 10. Side plate portions 20b, 20b that extend are formed, and rectangular cylindrical cavities 20c, 20c are formed on the lower surface side along both side edges of the short flat plate portion 20a, as shown in FIG. The connecting belt 15 is inserted into the hollow portions 20c, 20c, and the respective short separators 20 are connected. Two slits 20d and 20d are formed in the short plate portion 20a of the short separator 20 located at both ends of the plurality of connected short separators 20, and the side plate portion of each short separator 20 is formed. Reference numerals 20b and 20b are fixed to the inner surface of the free access tube 10 by rivets. Also in this short separator 20, since the side plate portions 20b and 20b extend vertically from both side ends of the short flat plate portion 20a, the thin lead-in cable 5 and the side plate portions 20b and 20b are free-accessed by the side plate portions 20b and 20b extending upward. It is possible to reliably prevent pinching between the inner surface of the tube 10 and to eliminate the disconnection of the lead-in cable 5.

  The connection between the vertically divided free access tube 10 bent in an arc shape and the vertically divided free access tube 10 bent in an arc shape (or the straight vertically divided free access tube 1) is connected to one arc shape. The other end of the other free access pipe 10 (or 1) is inserted into the connection port 1a at one end of the free access pipe 10 bent in the same direction, and both ends of the ridges 14b and 14b are used by using the separator connecting member 14 described above. The slits 20d and 20d of the short separator 20 in one free access tube 10 and the slits 20d and 20d (or 2d and 2d) of the short separator 20 (or separator 2) in the other free access tube 10 (or 1). ) So that the separator connecting member 14 does not float up, the protrusions 14b and 14b are slits 20d and 20d (or 2d, 2d) in may be performed by engaging from below.

  The upper and lower split type free access pipes 1 and 10 and the pipes connecting them are separated from the sheath pipe 7 through which the cable 6 is inserted and the lead-in cable 5 to the customer. The lead-in cable 5 is passed through the upper pipe space 3 above the separator 2 or 20, and the sheath pipe 7 for inserting the cable 6 is passed through the pipe lower space 4 below the separator 2 or 20. There is no fear that the pulling cable will be caught between the sheath pipes 7 when the pulling cable 5 is pulled, unlike the conventional common free access pipe in which the pulling cable 5 is passed through the The arrangement of the sheath tube 7 is not disturbed at the bent portion, and it is not difficult to secure a space through which the retractable cable 5 is passed. Since the side plate portions 2b and 20b of the separator 2 and the short separator 20 extend vertically from both side ends of the flat plate portion 2a and the short flat plate portion 20a, the thin lead-in cable 5 is formed by the side plate portions 2b and 20b extending upward. Side plates 13d and 14d that can be reliably prevented from being sandwiched and cut between the portions 2b and 20b and the inner surfaces of the free access tubes 1 and 10 and also extending upward to the separator connecting members 13 and 14. Therefore, it is possible to prevent the lead-in cable 5 from being cut. In addition, in this free access pipe, the separators installed in the interior can be easily and reliably connected to each other via the separator connecting members 13 and 14, and the separators can be misaligned, stepped, twisted, etc. Since the members 13 and 14 are not dropped or a gap is not generated between the separator and the separator connecting member, the pull-in cable 5 and the sheath tube 7 are not hooked or damaged at this connecting portion. It can pass smoothly through the pipeline.

FIG. 1 is a perspective view of a vertically divided free access tube according to an embodiment of the present invention. It is a top view which shows one Embodiment of the free access pipe | tube of this invention constructed by connecting the free access pipe and the free access pipe bent in the circular arc shape. It is a longitudinal cross-sectional view of the free access pipe. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is a perspective view which shows the separator of the free access pipe. It is a longitudinal cross-sectional view of the connection part of the free access pipe. It is a perspective view which shows an example of a separator connection member. It is a fragmentary perspective view explaining the method of the connection of the separator by the separator connection member. It is a perspective view which shows the other example of a separator connection member. . It is a fragmentary perspective view explaining the method of the connection of the separator by the separator connection member. It is the BB sectional view taken on the line of FIG. It is a top view of the free access pipe of the up-and-down division type bent in the shape of an arc. FIG. 5 is a perspective view showing a plurality of short separators connected to each other and installed in a free access pipe bent in an arc shape. It is a perspective view of a short separator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Free access pipe 1a Connection port 2 Separator 2a Flat plate part 2b Side plate part 2c Cavity part 2d Slit 3 Upper space in a pipe 4 Lower space in a pipe 5 Retraction cable 6 Cable 7 Sheath pipe 9 Rivet (fastening)
DESCRIPTION OF SYMBOLS 10 Free access pipe bent in circular arc shape 13 Separator connection member 13a Connection plate 13b Connection bar 13c Slit 14 Separator connection member 14a Connection plate 14b Convex strip 15 Connection belt 20 Short separator 20a Short flat plate portion 20b Side plate portion 20c Cavity portion

Claims (13)

  A separator is installed over almost the entire length of the free access pipe, the upper space inside the pipe above the separator is used as a space for the lead-in cable, and the lower space inside the pipe below the separator is passed through the sheath pipe for inserting the cable. A free access pipe divided into upper and lower parts, characterized by a space.   The separator is formed with curved side plate portions that are in contact with the inner surface of the free access tube on both side ends of the flat plate portion, and the side plate portion is fixed to the inner surface of the free access tube with a stopper. The upper and lower split type free access pipe according to claim 1.   The upper and lower divided type free access pipe according to claim 2, wherein side plates of the separator extend vertically from both side ends of the flat plate.   A free-access pipe of the upper and lower division type, in which a separator is installed over almost the entire length of the free-access pipe, and the inside of the free-access pipe is divided into a pipe upper space above the separator and a pipe lower space below the separator. A free access conduit characterized by connecting two or more cables, passing a lead-in cable through the upper space in the tube, and passing the cable through the sheath tube through the lower space in the tube.   The separator is formed with curved side plate portions that are in contact with the inner surface of the free access tube on both side ends of the flat plate portion, and the side plate portion is fixed to the inner surface of the free access tube with a stopper. The free access conduit according to claim 4.   The free access conduit according to claim 5, wherein the side plate portion of the separator extends vertically from both side ends of the flat plate portion.   The other end of the next free access pipe is inserted and connected to the connection port formed at one end of the free access pipe, and the ends of the separators built in the connected free access pipe are connected to each other via the separator connecting member. The free access conduit according to any one of claims 4 to 6, wherein the free access conduit is formed.   The separator connecting member is provided with two connecting bars on the lower surface side along both side edges of the connecting plate, and both end portions of the connecting bar protruding in the length direction from the connecting plate are connected to the flat plate portion of the separator. The free access pipe according to claim 7, wherein the end portions of the separator are connected to each other through a separator connecting member by being inserted into a cavity formed on the lower surface side along both side edges of the separator. Road.   A slit of a predetermined length is formed between the connecting plate of the separator connecting member and the connecting bar from both ends in the length direction of the connecting plate, and both side edges of the flat plate portion of the separator are inserted into the slit to The free access conduit according to claim 8, wherein both end portions in the vertical direction are overlapped with end portions of a flat plate portion of the separator.   The separator connecting member is formed by forming at least one protrusion having an inverted T-shaped cross section on the lower surface of the connection plate, and slits formed at both ends of the protrusion at the end of the flat plate portion of the separator. The end portions of the separator are connected to each other through the separator connecting member by engaging the ridges with the slits from below so that both end portions in the length direction of the connecting plate stacked on the end portions of the flat plate portion do not float. The free access conduit according to claim 7, wherein the free access conduit is connected.   The free access pipe of the upper and lower division type located in the bent part of the pipe is characterized by including a plurality of short separators connected to each other over almost the entire length of the free access pipe bent in an arc shape. The free access conduit according to claim 4.   The short separator forms curved side plate portions that contact the inner surface of the free access tube at both side ends of the short flat plate portion, and a hollow portion on the lower surface side along both side edges of the short flat plate portion. The free access conduit according to claim 11, wherein a plurality of short separators are connected by a connecting belt inserted through the hollow portion.   The free access conduit according to claim 12, wherein side plates of the short separator extend vertically from both side ends of the short plate.

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