JP3605551B2 - Piping structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a piping structure applied when piping a cable underground.
[0002]
[Prior art]
Conventionally, as shown in FIG. 7, this type of piping structure has an outer duct sleeve (3) attached to the communication port (2) of the handhole (1), and a fixing plate (4) inside the communication port (2). And an outer tube (15) having an annular convex portion (15B) at the end of the duct sleeve (3) from the outside of the handhole (1) to the concave portion (15A) between the annular convex portions (15B, 15B). A plurality of inner duct sleeves (16) are inserted from the fixing plate (4) inside the duct sleeve (3) through the rubber ring (15C), and a cable is inserted into the outer pipe (15). And the end of the straight protection tube (17) is connected to the inner duct sleeve (16).
In this case, a rubber ring groove (16A) is formed at the tip of the inner duct sleeve (16), and a rubber ring (18) is attached to the rubber ring groove (16A), and the inner duct sleeve (16) is connected to the rubber ring groove (16A). The direct protection tube (17) is provided with a sealing property, and the straight protection tube (17) is slidable with respect to the inner duct sleeve (16). The displacement in the axial direction (shown by an arrow) in (17) is absorbed (for example, Japanese Patent Application Laid-Open No. H11-8926).
[0003]
[Problems to be solved by the invention]
In the above conventional configuration, the straight protection tube (17) is made of, for example, hard vinyl chloride resin and has no flexibility, so that it cannot cope with displacement in the radial direction with respect to the axis, and the inner duct sleeve (16) Is formed with a rubber projection groove formed by a rubber ring groove (16A), so that the projections interfere with each other and the direct protection pipe (17) connected to the inner duct sleeve (16). As shown in FIG. 8, it is necessary to increase the diameter d of the outer tube (15). The outer diameter is 260mm to 270mm, and an outer pipe with an inner diameter of 300mm is required.) The diameter of the outer duct sleeve (3) must be correspondingly increased, and the underground piping space for the cable is increased. Plumbing work becomes large-scale, and underground cable piping and water and sewage Interference between the tube and the gas piping other piping which may occur.
[0004]
[Means for Solving the Problems]
According to the present invention, as a means for solving the above-mentioned conventional problems, an outer pipe (5) is inserted between a handhole (1) via a duct sleeve (3), and a handhole (5) is provided in the outer pipe (5). The present invention provides a piping structure in which a plurality of straight protection tubes (7) are inserted between flexible protection tubes (9) between them and a cable is routed in the straight protection tubes (7). The flexible protective tube (9) is preferably fixed at one end to a fixing plate (4) attached to the handhole (1), and the flexible protective tube (9) and the straight protective tube (9) are fixed. 7, 27) via a different-diameter pipe joint (10, 20, 30), and one connecting portion of the different-diameter pipe joint (10, 20, 30) is connected to the flexible protective tube (9). The insertion end is fitted inside, and the connection end of the straight protection pipe (7, 27) is connected to the other connection part (10B, 20B, 30B) of the different diameter pipe joint (10, 20, 30). Connected via mating or inner mating or socket (30C).
It is preferable that a rubber ring (12) having an outer diameter substantially equal to the outer diameter of the ridge (9B) is attached to the valley (9A) at the insertion end of the flexible protective tube (9). At the trough (9A) before and after the rubber ring (12) mounting trough (9A) at the insertion end of the flexible protective tube (9), the same material as the different diameter pipe joint (10, 20, 30) is used. Adhesive rings (13, 13) are attached, and one connecting portion (10A, 20A, 30A) of the different-diameter pipe joints (10, 20, 30) and the adhesive ring (13, 13) are bonded by an adhesive. It is desirable that the other connecting portions (10B, 20B, 30B) of the different-diameter pipe joints (10, 20, 30) and the straight protective tube (7, 27) are bonded by an adhesive.
[0005]
[Action]
According to the present invention, at the connection portion between the handhole (1) and the direct protection tube (7) of the cable, the direct protection tube (7) is connected to the handhole (1) via the flexible protection tube (9). . The flexible protective tube (9) is axially expandable and contractable radially with respect to the axis.
[0006]
Further, when the straight protection tube (7) and the flexible protection tube (9) are connected by a different-diameter pipe joint (10), the flexible protection tube (9) can expand and contract in the axial direction as described above. The straight protection pipe (7) may be fixedly connected to the different-diameter pipe joint (10) because the straight protection pipe (7) can be bent in the radiation direction. Therefore, there is no need to slidably connect the inner duct sleeve and the straight protection tube via a rubber ring as in the conventional case, so there is no need to provide a rubber ring groove in the different-diameter pipe joint (10). Neither is the enlarged diameter convex part formed. Therefore, when a plurality of straight protection pipes (7) connected to the different-diameter pipe joint (10) are bundled , the different-diameter pipe joint (10) has no mutual interference portion such as an enlarged diameter portion.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention will be described with reference to an embodiment shown in FIGS. 1 to 3. In the ground, a plurality of handholes (1) are buried at predetermined intervals at an upper surface in accordance with the ground level GL. A corrugated outer tube (5), in which concave ring portions (5A) and convex ring portions (5B) are alternately arranged, is inserted between the hand holes (1, 1). A straight protection pipe (7) for protecting the cable is inserted in the parentheses.
[0008]
At the connection between the handhole (1) and the outer pipe (5), an outer duct sleeve (3) is attached to the communication port (2) of the handhole (1), and the outer sleeve is attached to the duct sleeve (3). A pipe (5) is inserted through a rubber ring (5C). The flange (4A) of the fixing plate (4) is attached to the inside of the communication port (2) of the handhole (1) together with the root end flange (3A) of the duct sleeve (3) by the fixing bolt (14). A root end of a corrugated flexible protection tube (9) in which a plurality of concave ring portions (9A) and convex ring portions (9B) are alternately arranged is fixed to the fixing plate (4), The distal end of the flexible protection tube (9) is connected to a straight protection tube (7) via a different diameter pipe joint (10).
[0009]
As shown in FIG. 2, a rubber ring (11) is attached to the concave ring (9A) at the root end of the flexible protective tube (9), and a bell mouth (4B) is attached to the fixing plate (4). A rubber ring (12) is attached to the concave ring portion (9A) at the tip of the flexible protective tube (9) as shown in FIG. An adhesive ring (13, 13) is attached to 9A), and the root end is inserted into a socket (10A) of a different-diameter pipe joint (10). A socket (7A) is formed at the connection end of the straight protection tube (7), and the insertion end (10B) of the different-diameter pipe joint (10) is formed at the socket (7A). It is inserted.
[0010]
The flexible protective tube (9) is made of, for example, a polyolefin such as polyethylene, and the straight protective tube (7) and the different-diameter pipe joint (10) are made of polyvinyl chloride. ), An adhesive ring (13, 13) of the same material as that of the different-diameter pipe joint (10) is attached as described above, and the different-diameter pipe joint () is attached with an adhesive through the adhesive ring (13, 13). 10), and the straight protection tube 7 is directly bonded to the different diameter pipe joint 10 by an adhesive.
[0011]
The outer diameter of the flexible protective tube (9) is generally 67 mm when the nominal diameter is 50, and the outer diameter of the straight protective tube (7) is generally 60 mm when the nominal diameter is 50. The inner diameter of the socket (10A) of the joint (10) is set to 67 mm, and the outer diameter of the insertion end (10B) is set to 60 mm.
[0012]
In the above configuration, the straight protection tube (7) is connected to the handhole (1) via the flexible protection tube (9), and the flexible protection tube (9) can be expanded and contracted in the axial direction and can be moved with respect to the shaft. Since it can bend in the radial direction, it can cope with both axial and radial displacements of the straight protection tube (7). Further, since the different-diameter pipe joint (10) does not have an enlarged-diameter projection like the conventional inner duct sleeve (6), a plurality of straight protection pipes (7) can be compactly bundled. When the protective tube (7) is bundled in eight rows, the outer diameter becomes 240 mm, and as a result, the inner diameter d of the outer tube (5) can be reduced to generally 250 mm.
[0013]
In addition to the above embodiment, in the present invention, for example, as shown in FIG. 4, the connection end of the straight protection pipe (27) may be fitted inside the connection (20B) of the different diameter pipe joint (20). In this case, the flexible protective tube (9) is fitted inside the socket (20A) of the different-diameter pipe joint (20) in the same manner as in the previous embodiment, and is bonded via the bonding rings (13, 13). . Further, in the present invention, as shown in FIG. 5, the straight protection pipe (27) is connected to the other connection part (30B) of the different diameter pipe joint (30) via the socket (30C) to the different diameter pipe joint (30). May be. The socket (30C) is bonded to the straight protection pipe (27) and the other connecting part (30B) of the different diameter pipe joint (30) by an adhesive. The flexible protection tube (9) is connected to the socket (30A) of the different diameter pipe joint (30). Further, in the present invention, the outer tube may be inflexible.
[0014]
Further, in the present invention, as shown in FIG. 6, a predetermined number of duct sockets (41) are stacked on the root end of the duct sleeve (3), and the root end of the flexible protective tube (9) is connected to the duct socket (41). Then, the space between the duct sockets (41) may be solidified with a resin mortar (42).
[0015]
【The invention's effect】
In the present invention, by using the flexible protective tube, the piping can be displaced in both the axial direction due to the crustal deformation and the radial direction with respect to the axis, and the piping can be reliably prevented from being damaged. . Since the different diameter pipe joint for connecting a flexible protective tube and the straight protective tube is not formed enlarged diameter protrusion of a rubber ring groove, come out focusing a straight protective tube plural rows in a compact, thus the outer tube The diameter of the pipe can be reduced, so that the piping space can be reduced, interference with other pipes can be easily avoided, and the piping work does not become large.
[Brief description of the drawings]
1 to 3 show one embodiment of the present invention.
FIG. 1 is a cross-sectional view of a handhole connection part. FIG. 2 is a cross-sectional view of a fixed plate part. FIG. 3 is a cross-sectional view of a different-diameter pipe joint. It is a side view of other examples.
FIG. 5 is a side view of still another embodiment of a connection portion between a straight protection pipe and a different-diameter pipe joint.
FIG. 6 is a cross-sectional view of a handhole connection portion of still another embodiment. FIGS. 7 and 8 show a conventional example.
FIG. 7 is a sectional view of a handhole connection part. FIG. 8 is a sectional view of a flexible outer tube.
1 Handhole
2 Contact
3 Duct sleeve
4 Fixing plate
5 outer tube
7,27 straight protection tube
9 Flexible protective tube
10,20,30 Different diameter pipe fittings
10A, 20A, 30A One connection
10B, 20B, 30B The other connection
12 Rubber ring
13 Adhesive ring
30C socket

Claims (5)

An outer tube is inserted between the hand holes via a duct sleeve, a plurality of direct protective tubes are inserted between the hand holes via a flexible protective tube between the hand holes, and a cable is routed in the direct protective tube. Characteristic piping structure 2. A piping structure according to claim 1, wherein said flexible protective tube has one end supported and fixed to a fixing plate attached to a handhole. The flexible protection tube and the straight protection tube are connected via a different-diameter pipe joint, and an insertion end of the flexible protection tube is fitted inside one connection portion of the different-diameter pipe joint. The piping structure according to claim 1, wherein the connection end of the straight protection pipe is connected to the other connection part of the different-diameter pipe joint via an outer fitting, an inner fitting, or a socket. 4. The piping structure according to claim 3, wherein a rubber ring having an outer diameter substantially equal to the outer diameter of the ridge is attached to a valley at the insertion end of the flexible protective tube. An adhesive ring of the same material as the different diameter pipe joint is attached to a valley before and after the rubber ring mounting valley at the insertion end of the flexible protective tube, and one of the connection parts of the different diameter pipe joint and 5. The piping structure according to claim 4, wherein the bonding ring is bonded with an adhesive, and the other connecting portion of the different-diameter pipe joint and the straight protective tube are bonded with an adhesive.

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