JP3686557B2 - Inner pipe support joint and piping structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inner pipe support joint that takes out and supports an inner pipe such as a protective pipe for cables from the inside of the outer pipe, and a piping structure using the inner pipe support joint.
[0002]
BACKGROUND OF THE INVENTION
In order to embed cables in the ground, the cables are inserted into a protective tube, and further, a plurality of strips of the protective tube are inserted into the outer tube, and the outer tube is installed in a piping groove for backfilling. A hand hole is disposed in the groove at a certain distance, an outer tube is inserted between the hand holes, and a protective tube is inserted into the outer tube from the ground via the hand hole.
There are cases where obstacles such as gas pipes and drainage grooves exist in such a pipeline. In this case, piping must be performed avoiding the obstacle.
[0003]
[Prior art]
Conventionally, as shown in FIG. 14 , hand holes (1, 1) are installed on both sides of the front of the obstacle H buried in the ground, and the joint (2) buried in each hand hole (1). The outer tube (3) is connected to the protective tube (not shown) through which the cable (4A) is inserted into the outer tube (3). The cable (4A) is taken out into the steel pipe (5) on the opposite side of the handhole (1), avoiding the obstacle H, and passed over the sleeve (6) on the upper side thereof. A configuration for introducing a cable (4A) was provided.
[0004]
[Problems to be solved by the invention]
In the above conventional configuration, hand holes (1) must be installed on both front and rear sides of the obstacle H, and it takes time to install the hand holes (1) and secure a space for installing the hand holes (1). In addition, an extra plumbing tool such as a joint (2) and a sleeve (6) for connecting the outer pipe (2) and steel pipe (5) to the hand hole (1) is required, and piping work is costly. There is a problem to be up.
[0005]
[Means for Solving the Problems]
The present invention provides a joint for supporting the inner pipe (4) taken out from the end of the outer pipe (3) through which a plurality of corrugated inner pipes (4) are inserted, as means for solving the above conventional problems. A partition plate (15) with a plurality of inner tube insertion holes (14) provided at one end and a receiving portion (13) of the outer tube (3) formed at one end. Further, a short cylindrical inner ring (16) having a thread groove (17) formed on the outer periphery protrudes outside the inner pipe insertion hole (14) of the partition plate (15), and the inner ring ( 16) is screwed with a cap nut-shaped outer ring (18) having a thread groove (19) and a stepped portion (20) formed on the inner periphery, and is closely inserted into the inner ring (16). A packing ring (30) attached to a trough (42) near the end of the inner pipe (4) is sandwiched between the inner ring (16) and the outer ring (18), thereby The inner pipe (4) inserted and supported by the ring (16) is prevented from coming off, and a coupling (52) is attached to each inner pipe (4). Through that other inner tube (4) is intended to provide a tube support joint hand are connected (11).
Further in the toward the partition plate (15) side to the obstacle H side in front of the obstacle H existing in the piping path established該継hand (11), the outer tube socket portion of該継hand (11) ( 13) Insert the outer pipe (3) from the opposite side of the obstacle H, and connect the multiple inner pipes (4) taken out from the outer pipe (3) to the partition plate (15) of the joint (11). The inner ring (16) is inserted into the inner ring (16) through the inner pipe insertion hole (14), and the inner ring (16) and the outer ring (18) are screwed to the inner ring (16). The inner pipe (4) is prevented from coming off by sandwiching a packing ring (30) attached to a trough (42) near the end of the inner pipe (4) between the partition plate (15 ) Connect the other inner pipe (4) from the obstacle H side to the end of each inner pipe (4) going out from the obstacle H side via the coupling (52). It is configured to get over the object H and connected to the hand hole (58) or the joint (11, 81), and the inner pipe (4) is stacked toward the obstacle H. A pipe path structure that are arranged in parallel state from the state in which serve Hisage.
The present invention is particularly useful for underground burying of cables, in which the inner pipe (4) is used as a protective pipe for protecting cables such as communication lines, power lines, and optical cables.
[0006]
[Action]
The outer pipe (3) is inserted into the outer pipe receiving part (13) of the joint (11), and a plurality of corrugated inner pipes (4) taken out from the outer pipe (3) are divided into the partition plates (15). A cap nut-shaped outer ring that is closely inserted into the short cylindrical inner ring (16) through the inner tube insertion hole (14) and the inner tube (4) is passed through the short cylindrical inner ring (16). Screw (18). A packing ring (30) is attached to the valley (42) near the end of the inner pipe (4), and the packing ring (30) is connected to the end surface (16A) of the inner ring (16) and the outer ring. The inner pipe (4) is prevented from coming off by being sandwiched between the step (20) of (18). The other inner pipe (4) is connected via the coupling (52) to each inner pipe (4) taken out from the outer pipe (3) and fixed by the joint (11). Since the inner pipe (4) is corrugated and flexible, it can be bent to avoid the obstacle H. The obstacle H riding-over part (the shallowest part) of the inner pipe (4) is It is desirable that the steel pipe (56) is inserted and the front and rear portions thereof are covered with a plastic foam coating (53) to protect the inner pipe (4) from external forces such as earth pressure and crustal deformation.
[0007]
【Example】
FIG. 1 to FIG. 13 show an embodiment of the present invention. (11) is an inner pipe support joint made of a cylindrical body made of plastic, and a rib is formed at an inner peripheral intermediate portion of the joint (11). (12) is circumferentially provided, one side of the rib (12) is slightly enlarged in diameter to form a receiving part (13) of the outer tube (3), and the other side end is provided with an inner part. A partition plate (15) provided with a plurality of tube insertion holes (14) is stretched.
[0008]
A short cylindrical inner ring (16) having a thread groove (17) provided on the outer periphery is projected from the outside of each insertion hole (14) of the partition plate (15). A cap nut-shaped outer ring (18) is screwed to the outer side of the inner ring (16), and a thread groove (19) and a step portion (20) are formed on the inner periphery of the outer ring (18). Has been. As shown in FIG. 2, a shielding plate (21) made of rubber, elastomer or the like is sandwiched between the inner ring (16) and the outer ring (18) in each insertion hole (14) of the partition plate (15). Has been.
[0009]
The end of the outer tube (3) is inserted into the receiving port (13) of the joint (11). As shown in FIG. 4, the outer pipe (3) is composed of a corrugated outer pipe (31) and a straight pipe-shaped inner pipe (32) in which peaks (31A) and valleys (31B) are alternately formed. A rubber packing ring (22B) is attached to a trough (31B) at the end via a plastic spacer (22A) such as polypropylene. The outer pipe (3) is provided with a protective pipe (4), which is an inner pipe. The protective pipe (4) includes a crest (41), a trough (42), as shown in FIG. Are corrugated flexible tubes formed alternately, and are cut to a predetermined length (for example, 5 m).
[0010]
The protective tube (4) is converged by a plurality of (for example, eight) nozzles (23), and the nozzle (23) includes a disk-shaped main body (24) and the main body (24) as shown in FIG. 24) and a fixed band (25) attached to the outer periphery of the main body (24). Seven pipe fitting recesses (26) are formed from the periphery of the main body (24), and an outer portion is formed at the center. A tube fitting hole (28) communicating with the tube fitting recess (26) via a gap (27) is formed.
[0011]
In order to converge the eight protective tubes (4) by the nozzle (23), the protective tubes (4) are respectively provided in the tube fitting recess (26) and the central tube fitting hole (28) of the main body (24). ), The fixing band (25) is wound around from the outside, and the distal end of the fixing band (25) is fastened with the pin (29) at the root end. In this way, the outer shell shape of the nozzle pedestal (23) follows the inner peripheral shape of the outer tube (3) in a state where the protective tube (4) is focused and fixed to the nozzle pedestal (23) by the fixing band (25). The shape is different. Therefore, since the focused protective tube (4) slides smoothly in the outer tube (3) together with the nozzle (23), it is easy to insert the protective tube (4) into the outer tube (3). I can do it.
[0012]
In the joint (11), the protective pipe (4) drawn from the outer pipe (3) is inserted into the inner ring (16) through the inner pipe insertion hole (14) of the partition plate (15), and A portion of the ring (16) protruding outward is trimmed to a predetermined length (for example, a length corresponding to seven troughs (42)). A rubber packing ring (30) is attached to each protection tube (4) and the outer root portion (42), and then the outer ring (18) is connected to each inner ring (16) through the protection tube (4). ) Is screwed and tightened. Thus, as shown in FIG. 2, the packing ring (30) of each protective tube (4) is sandwiched between the end face (16A) of the inner ring (16) and the step (20) of the outer ring (18). The protective tube (4) is prevented from coming out of the inner tube insertion hole (14) and the inner ring (16) of the partition plate (15) by the engagement of the packing ring (30) and the valley portion (42). Furthermore, the intrusion of water from the outer ring (18) is also prevented.
[0013]
The joint (11) which connects the outer pipe (3) in this way and supports and fixes the protective pipe (4) (inner pipe) taken out from the outer pipe (3) is, for example, a pipe as shown in FIG. The most prominent trough (42) of each protection pipe (4) installed in the pipe groove (50) in front of the obstacle H existing in the road and going out from the joint (11) as shown in FIG. ) Is equipped with a rubber packing ring (51), and another protective tube (4) is connected to the protective tube (4) from the obstacle H side via the coupling (52) shown in FIG. Is done. The protective tube (4) is cut to a predetermined length (for example, 5 m), and a plurality of (for example, eight) protective tubes (4) are divided into four groups of two as shown in FIG. It is covered with a covering (53). Each coating (53) is made of, for example, a plastic foam such as polyethylene, polypropylene, polystyrene, etc., and can absorb external force in the ground by its cushioning property, or a large number of Vs on the upper and lower surfaces as shown in FIG. A groove (53A) is formed and can be bent in the vertical direction. Then, both end portions of each protective tube (4) go out from the covering (53), and a rubber packing ring (54) is attached to the valley portion (42) of one outgoing end, and the other outgoing end A coupling (55) is fitted to the unit, and a plurality of such units are connected via the coupling (55), and from the stacked state toward the obstacle H as shown in FIG. Since the earth pressure from the automobile or the like traveling on the ground surface S is the largest at the part over the obstacle H, that is, at the shallowest part, each protective pipe (4) is a heterogeneous pipe joint (57) as shown in FIG. A cable (4A) connected to one end of each of the protective pipes (4) is covered with a steel pipe (56) connected to the other end of the dissimilar pipe joint (57). The steel pipes (56) are arranged in a plurality of strips (for example, eight) in parallel. In this embodiment, the coating (53) used covers two protective tubes, but the coating may cover one or more protective tubes. In the shallowest part, the cable (4A) may be covered with a protective pipe (4) instead of the steel pipe (56), and further, the protective pipe (4) may be covered (53).
[0014]
A concrete hand hole (58) is already installed in the pipe end groove (50A) on the opposite side of the joint (11) of the obstacle H, and the hand hole (58) is opposite to the obstacle H. 10 to 12 is connected to an outer pipe (3) through a joint (59) as shown in FIGS. 10 to 12, and the protective pipe (4) taken out from the outer pipe (3) is a pipe of the joint (59). In the hand hole (58), the cable (4A) is taken out from the protective tube (4), and the cable (4A) is connected to the bell as shown in FIG. It is introduced into the mouse block (74) and further introduced into the protective tube (4) unit connected to the coupling (74A) attached to the bell mouth block (74).
[0015]
As shown in FIG. 10, the holding plate (60) of the joint (59) includes a petri dish-type main body (61), a flange (62) extending outward from the upper peripheral edge of the main body (61), The holding plate comprises a plurality of inner rings (63) provided integrally with a plurality (eight) of tube insertion openings (63A) provided on the base surface (61A) of the main body (61). The flange (62) of (60) is provided with a plurality of bolt holes (64), and a thread groove (63B) is formed on the outer periphery of the inner ring (63). The tube holding plate (60) is formed by, for example, injection-molding the main body (61) after inserting an inner ring (63) in injection molding.
[0016]
As shown in FIG. 11, the holding plate (60) is attached to the inside of the communication port (65) of the hand hole (58) with the inner ring (63) formation side facing inward. The joint (59) is inserted from the outside into the outer end of the joint (59), and an outer tube receiving portion (66) having an enlarged diameter is formed at the outer end of the joint (59). (67) is formed, and the flange (67) and the flange (62) of the holding plate (60) are overlapped inside the communication port (65) of the hand hole (58), and the bolt (68) and Secure with embedded nut (69). Further, a bead shape (70) is formed on the outer periphery of the root end portion of the joint (59), and the bead shape (70) is formed on a mortar filled in the communication port (65) of the hand hole (58). It bites in and improves the mounting strength of the joint (59).
[0017]
(71) is an outer ring that is screwed to the outer side of the inner ring (63) of the holding plate (60), and a thread groove (71A) is formed on the inner periphery of the outer ring (71), A step portion (72) is formed at the base, and a bell mouth portion (73) is formed at the root end portion from the step portion (72). The inner ring (63) of the holding plate (60) and the outer ring (71) constitute a pipe fixing ring (74).
[0018]
An outer pipe (3) is connected to the receiving port (59) of the joint (59). A rubber packing ring (22B) is attached to a trough at the end of the outer tube (3) via a plastic spacer (22A) such as polypropylene. And a plurality of protective tubes (4) focused by a nozzle (23) are inserted into the outer tube (3), the protective tube (4) is drawn out from the outer tube (3), As shown in FIG. 12, the end portion is inserted into the inner ring (63) through the tube insertion port (63A) of the holding plate (60). An outer ring (71) is screwed into the inner ring (63) from the inside of the hand hole (58). The packing ring (30) attached to the trough (42) of the protective tube (4) is formed between the end surface of the inner ring (63) and the inner peripheral step (72) of the outer ring (71). The end portion of the protective tube (4) is fixed by the outer ring (71), and the end portion of the protective tube (4) is prevented from coming off.
[0019]
In this embodiment, the partition plate (15) is integrally stretched to the joint (11) .However, the partition plate may be separately molded by injection molding or the like, and attached to the joint. ) Is integrally provided in the tube insertion port (63A) of the holding plate (60), but the inner ring may be attached separately to the tube insertion port (63A).
[0020]
In the present invention, the main body of the tube holding plate is made of plastic such as polyethylene or polypropylene, the inner ring is made of plastic such as nylon, and the outer ring is made of plastic such as polypropylene.
[0021]
The present invention is not limited to the above embodiment , and it is possible to dispose joints (11) on both sides of the obstacle , and the outer tube needs to be flexible in the case of a straight pipe line. There is no.
[0022]
【The invention's effect】
In the present invention, as described above, the support and fixing of the inner pipe taken out from the outer pipe is surely performed by the partition plate of the joint, and if such a joint is used, eliminates the need for a hand hole on both sides in order to avoid an obstacle, it may be utilized existing hand hole in most one, Handoho - labor such as Le installation work is omitted, and fittings and sleeves or cup Piping tools such as rings can be kept to a minimum, and the cost required for piping work is greatly reduced.
[Brief description of the drawings]
1 to 13 show an embodiment of the present invention.
[Fig. 1] Side cross-sectional view of a joint portion [Fig. 2] Partial enlarged side cross-sectional view of a partition plate [Fig. 3] Joint slope view [Fig. FIG. 6 is an explanatory diagram of a piping path when there is an obstacle. FIG. 7 is a perspective view of a protective tube unit with a coating. FIG. 8 is a partial side view of the coating. ] FIG. 11 is a sectional side view of the joint. [FIG. 12] is a partial sectional view of the partition plate. [FIG. 13] is a perspective view of the bell mouth block. [FIG . [Explanation of symbols]
3 Outer pipe 4 Inner pipe 11, 81 Joint (Inner pipe support joint)
13, 83 Outer tube receiving portion 14 Inner tube insertion hole 15 Partition plate 16 Inner ring 16A End surface 18 Outer ring 20 Step portion 30 Packing ring 42 Valley portion 52 Coupling 82 Inner tube fixing portion

Claims (5)

A joint that supports the inner pipe taken out from the end of the outer pipe through which a plurality of corrugated inner pipes are inserted. The outer pipe receiving part is formed at one end and the inner pipe is inserted at the other end. A partition plate provided with a plurality of holes is stretched, and a short cylindrical inner ring having a thread groove formed on the outer periphery thereof is projected outside the inner tube insertion hole of the partition plate. A cap ring- shaped outer ring having a thread groove and a step formed on the inner periphery is screwed, and the packing ring is attached to a trough near the end of the inner tube that is closely inserted into the inner ring. Is clamped between the inner ring and the outer ring to prevent the inner pipes inserted and supported by the inner ring from coming off, and each inner pipe is connected to another inner pipe via a coupling. Inner pipe support joint characterized by being connected to each other The inner pipe support joint according to claim 1 , wherein the inner pipe is a protective pipe for cables. The joint according to claim 1 is installed with the partition plate side facing the obstacle in front of the obstacle present in the piping, and the outer pipe is inserted into the outer pipe receiving portion of the joint from the opposite side of the obstacle. A plurality of inner pipes taken out from the outer pipe are inserted into the inner ring through the inner pipe insertion hole of the partition plate of the joint, and the outer ring is screwed to the inner ring and the inner ring and the outer ring are screwed together. An inner pipe is prevented from coming off by sandwiching a packing ring attached to a trough near the inner pipe end between the ring, and a cup is attached to each inner pipe end protruding from the partition plate. Another inner pipe is connected from the obstacle side via a ring, and the other inner pipe is connected to the handhole or the joint of claim 1 over the obstacle, and the inner pipe is connected to the obstacle. Piping structure characterized by being arranged in a parallel state from a stacked state toward an object The pipe line structure according to claim 3, wherein a steel pipe is interposed in an obstacle passage portion of the other inner pipe, and the front and rear portions of the steel pipe are covered with a plastic foam. The piping structure according to claim 3 or 4, wherein the inner pipe is a protective pipe for cables.

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