JP4184896B2 - Piping structure - Google Patents

Description

  The present invention relates to a protective cover attached to a cable protective tube, which is a flexible tube through which a cable is passed, and a piping structure of the cable protective tube using the protective cover.

For example, in order to lay a cable or the like in the ground, conventionally, in order to protect the cable, the cable is drawn into a flexible tube (cable protection tube) buried in the ground.
In this case, first, a pipe groove is dug, a flexible pipe is piped into the pipe groove, a cable is drawn into the flexible pipe, and the pipe groove is backfilled with earth and sand.
However, when the embedment depth of the flexible tube is within 30 cm from the road surface, the flexible tube is also easily deformed by earth pressure or the like. Since the flexible pipe has a circular longitudinal section, a gap is created between the pipes or between the pipe and the bottom of the piping groove. When the flexible pipe is embedded, the gap between the pipe and the pipe or between the pipe and the pipe groove bottom is formed. It is necessary to fill with good quality earth and sand and to ensure compaction.
If the gap between the pipe and the pipe or the gap between the pipe and the pipe groove is not completely filled with earth and sand, the pipe will not be applied with an equal earth pressure from the surroundings, and the earth pressure will be uneven. It becomes easy to deform.

[Conventional technology]
In order to prevent the deformation of the flexible tube and the like, there has been conventionally provided a configuration in which a protective tube cover (36) having a rectangular vertical cross section is attached to the flexible tube (1) as shown in FIG. . The protective cover (36) is vertically divided into two, and a flexible pipe insertion groove (38, 38) having a semicircular cross section is provided on the upper and lower surfaces of the divided members (37, 37). When the members (37, 37) are overlapped, a flexible tube insertion hole (95) having a circular cross section is formed by the both flexible tube insertion grooves (38, 38) (see, for example, Patent Documents 1 and 2).

JP 11-205982 A (FIG. 4) Japanese Patent No. 3161950 (FIG. 3)

Since the conventional protective cover (36) has a rectangular shape in the longitudinal section, there is a gap between the protective covers (36) or between the protective cover (36) and the piping equipment even if a plurality of them are arranged in parallel. Since it does not occur, the protective cover (36) is almost completely embedded with earth and sand and hardly deforms due to earth pressure.
However, in the conventional protective cover (36), if the mating surfaces (37A, 37A) of the pair of split members (37, 37) are not widened, the split members (37) can be separated from the mating surfaces (37A, 37A). , 37) are easily damaged. This is because earth pressure is exerted vertically on the mating surfaces (37A, 37A) of the divided members (37, 37). If the mating surfaces (37A, 37A) of the pair of divided members (37, 37) are widened, there is a problem that the pipe volume increases and a compact pipe cannot be formed.

As a means for solving the above-described conventional problems, the present invention provides a flexible tube (1) provided with an insertion port (5) at one end and a receiving port (4) at the other end between hand holes (20, 20). It is the structure which connects and passes a plurality of
It consists of a pair of divided members (7, 7) having a shape divided along a diagonal line of the rectangular parallelepiped, and each of the divided members (7, 7) has a flexible tube fitting portion (10, 12) and when the pair of divided members (7, 7) are overlapped with the flexible tube fitting portions (10, 12) facing each other, the flexible tubes of both divided members (7, 7) A protective cover (6) for the flexible tube (1) having a configuration in which the flexible tube insertion portion (15) having a circular longitudinal section is formed by the fitting portions (10, 12), is prepared,
Furthermore, it consists of a pair of divided members (7A, 7A) having a shape divided along the diagonal line of the rectangular parallelepiped, and the pair of divided members (7A, 7A) has a semicircular receptacle portion fitting portion (10A, 12A) is provided, and when the pair (7A, 7A) of the divided members are overlapped with the receiving portion fitting portions (10A, 12A) facing each other, the receiving portions of both divided members (7A, 7A) are fitted. Prepare a protective cover (6A) for the receiving part having a configuration in which the receiving part insertion part (15A) having a circular longitudinal section is formed by the parts (10A, 12A),
A plurality of the protective covers (6) are adhered and fixed along the longitudinal direction outside the flexible tube (1),
The protective cover (6A) of the receiving part is attached and fixed to the receiving part (4) of the flexible tube (1),
When connecting a pair of the flexible tubes (1), one insertion portion (5) is fitted inside the other receiving portion (4),
In this way, the plurality of flexible tubes (1) are connected, and in this state, the plurality of flexible tubes (1) are connected to the flexible tube insertion portions (15, 15A) of the respective protective covers (6, 6A). In the inserted state,
In both hand holes (20, 20), the receiving member (22) is attached to the opening (21) of the hand hole (20),
The insertion part (1) of the flexible tube (1) protruding from the protective cover (6) located at one end to the receiving member (22) attached to the opening (21) of one hand hole (20) 5)
In the other hand hole (20), cut the flexible tube (1) located at the end according to the distance between the hand holes,
The outer end of the flexible tube (1) has a dedicated joint comprising a receiving block (24) of the flexible tube (1) and an insertion portion (25) inserted from one end of the receiving block (24). 23)
The insertion part (25) of the dedicated joint (23) is fitted inside the receiving member (22) of the hand hole (20),
Thus, a piping structure is provided in which the flexible tube (1) is passed between the pair of hand holes (20, 20) .
The rectangular parallelepiped shape of the rectangular parallelepiped formed by overlapping the divided members (7, 7 ) of the protective cover (6) is a square, and the length of one side of the square is the length of the flexible tube (1) to be fitted. It is desirable that the diameter is set to be approximately equal to the diameter, and the flexible tube (1) fitted to the protective cover (6) has annular grooves (3) and annular ridges (2) arranged alternately. An independent corrugated tube, and the flexible tube fitting portion (10, 12) of the split member (7, 7) of the protective cover (6) of the flexible tube (1) It is desirable that a plurality of reinforcing ribs (11) are provided along the bottom circumferential surface of the annular concave groove (3) of the pipe (1).
Further the longitudinal sectional shape of a rectangular parallelepiped formed by superimposing division member of the protective cover of the socket portion (6A) (7A, 7A) are square, flexible length of one side of the square to be fitted It is desirable that the diameter is set substantially equal to the diameter of the receiving portion (4) of the pipe (1).
Further, the pair of divided members (7, 7), (7A, 7A) are connected to mutual engaging means (13) when the pair of divided members (7, 7), (7A, 7A) are overlapped. , 14, 13A, 14A) are preferably provided.

In the above SL piping structure, the receptacle block dedicated joint attached to the outer end portion of the flexible tube (1) (23) (24) is a rectangular parallelepiped box shape, the front and rear surface shapes thereof, the protective cover It is desirable to be the same as the front / rear shape of (6).

[Action]
The protective cover (6, 6A) of the present invention comprises a pair of divided members (7, 7), (7A, 7A) having a shape divided along a diagonal of a rectangular parallelepiped, and the divided members (7, 7, 7A, A rectangular parallelepiped protective cover (6, 6A) is constructed by superimposing 7A). In the protective cover (6, 6A), the mating surfaces (71, 71, 71A, 71A) of the pair of divided members (7, 7, 7A, 7A) are along the diagonal lines of the front and rear surfaces of the rectangular parallelepiped. Then, even if the mating surfaces (71, 71, 71A, 71A) of the divided members (7, 7, 7A, 7A) are set wide, the vertical cross-sectional area of the protective cover (6, 6A) does not increase.
When the front and rear surfaces of the rectangular parallelepiped protective cover (6, 6A) are square, and the length of one side of the square is set to be approximately equal to the diameter of the flexible tube (1) to be fitted, the protective cover (6, 6A) Will be the most compact.
The flexible tube (1) is formed by the flexible tube fitting portions (10, 12, 10A, 12A) of the pair of split members (7, 7, 7A, 7A) constituting the protective cover (6, 6A). Is inserted into the flexible tube insertion portion (15, 15A), and a reinforcing rib (11, 11A) is provided on the inner periphery of the flexible tube fitting portion (10, 12, 10A, 12A). If this is done, the thickness can be reduced by reducing the thickness. Each of the reinforcing ribs (11, 11A) is fitted in the annular groove (3,4A) of the flexible tube (1), so that the protective cover (6, 6A) is not easily deformed by earth pressure. Become.

The overlapping surfaces (71, 71, 71A, 71A) of the pair of divided members (7, 7, 7A, 7A) are on the diagonal of the rectangular parallelepiped, but the mutual engagement means (13, 14), (13A, 14A), when the two divided members (7,7) and (7A, 7A) are engaged in an overlapped state, the two divided members (7,7) and (7A, 7A) are prevented from shifting from each other. The
As described above, a plurality of flexible tubes (1) are connected to each other in a state of being covered with a plurality of protective covers (6, 6A), and are passed between hand holes (20, 20). The flexible tubes (1, 1) are connected to each other by providing an insertion port (5) at one end of the flexible tube (1) and a receiving port (4) at the other end. The other insertion portion (5) is fitted inside the one reception portion (4) of the pipe (1).
Since the flexible tube (1,1) is completely covered with the protective cover (6,6A) in this way, it is possible to embed a shallow earth covering of 200 mm.

In order to connect the flexible tube (1) to the hand hole (20, 20), the receiving member (22) is attached to the opening (21) of both hand holes (20, 20), and one hand hole ( In 20), the insertion portion (5) of the flexible tube (1) is fitted into the receptacle member (22). In the other hand hole (20), the flexible tube (1) located at the end corresponding to the distance between the hand holes (20, 20) is cut, and the outer end of the flexible tube (1) is cut. A dedicated joint (23) is attached to the portion, and the insertion portion (25) of the dedicated joint (23) is fitted inside the receptacle member (22) of the hand hole (20).
In the above piping structure, since the protective cover (6, 6A) is a rectangular parallelepiped, the protective covers (6, 6), (6A, 6A) installed side by side or stacked closely In addition, the bottom surface of the protective cover (6, 6A) and the bottom surface of the piping groove are in close contact with each other with almost no gap.

〔effect〕
In the present invention, since the protective cover of the flexible tube through which a cable or the like is inserted is constituted by a pair of divided members obtained by dividing the rectangular parallelepiped along the diagonal line, the outer dimension of the protective cover is substantially the same as the outer diameter of the flexible tube insertion portion. Even in the most compact state, the mating surfaces of the divided members can be widened to ensure strength.

  The present invention will be described with reference to an embodiment shown in FIGS. 1 to 9. As shown in FIG. 1, the flexible tube (1) has a convex ring portion (2) and a concave ring portion (3) along the longitudinal direction. Independent corrugated tubes arranged alternately, and made of a synthetic resin such as polyethylene, polypropylene, polyester, and polyvinyl chloride. The flexible tube (1) is provided with a receiving portion (4) at one end and an insertion portion (5) at the other end.

  As shown in FIG. 2, a concave ring portion (4A) is formed by recessing the outer periphery at the intermediate inner periphery of the receptacle (4), and the outer periphery is formed at the front end of the insertion port (5). The ring is recessed to form a locking ring groove (5A), and the middle part is formed with a rubber ring mounting groove (5B) having an outer periphery recessed.

FIG. 3 shows a dividing member (7) of the protective cover (6), which is made of a synthetic resin such as polyethylene, polypropylene, polyester, ABS resin, polyvinyl chloride, or a recycled resin thereof. ) Is composed of a side plate (8, 8) and a front and back plate (9, 9) that are orthogonal to each other, and the front and back plate (9, 9) is an isosceles right triangle, and the hypotenuse of the front and back plate (9, 9) Is provided with a semicircular flexible tube insertion notch (10, 10) which is a flexible tube fitting portion.
Further, a plurality of reinforcing ribs (11) are provided between the front and rear face plates (9, 9) of the divided member (7). Each reinforcing rib (11) is provided with a semicircular flexible tube insertion notch (12) which is a flexible tube fitting portion by cutting an isosceles right triangle from the oblique side. The reinforcing rib (11) prevents the split member (7) from being deformed by earth pressure or the like, and the side plates (8, 8) can be thinned and lightened.

A pair of the split members (7) are prepared, and are fixed by aligning the hypotenuses as shown in FIG. 4 and engaging one locking claw (13) with the other engaging groove (14). To do. This fixing is performed by sandwiching the flexible tube (1) from both sides. Further, the ends of the pair of divided members (7, 7) may be coupled to each other by a hinge.
In this way, a pair of the divided members (7) are overlapped to form a rectangular parallelepiped protective cover (6) having a front and rear shape , and the front and rear plates (9, 9) of the pair of divided members (7, 7) are formed. ) Between the flexible tube insertion notches (10, 10) and the flexible tube insertion notches (12, 12) between the reinforcing ribs (11, 11). 15) is formed. The rectangular parallelepiped shape may be a shape having a rounded ridgeline.
In the above configuration, as shown in FIG. 4, the length and width of the protective cover (6) (the length of one side of the square front and rear surfaces) are set to the diameter of the flexible tube insertion portion (15) (flexible tube (1 )), The overlapping surfaces (71, 71) of the pair of divided members (7, 7) can be widened.

The plurality of flexible tubes (1) are interconnected. In this case, as shown in FIG. 2, the insertion portion (5) of one flexible tube (1) is connected to the other flexible tube (1). Fits inside the receiving part (4). The locking ring groove (5A) of the insertion port (5) of the one flexible tube (1) has a locking ring in which a plurality of locking claws (17) are inserted obliquely upward from the ring base (16). (18) is mounted, but the ring base (16) is bent in a pulse wave shape as shown in FIG. 5 so that its diameter can be elastically expanded and contracted. When mounting in the locking ring groove (5A), the diameter of the ring base (16) is increased. Then, the locking claw (17) of the locking ring (18) is engaged with the concave ring portion (4A) of the receiving port (4) of the other flexible tube (1), so that the flexible tube (1, 1) is engaged. 1) Both sides are prevented from coming off, and a rubber ring (19) is mounted in the rubber ring mounting groove (5B) of the insertion part (5) of the one flexible pipe (1). 1,1) Ensures watertightness of interconnected parts.
The inner diameter of the insertion portion (5) of the flexible tube (1) is set substantially equal to the inner diameter of the concave ring portion (3) of the flexible tube (1). Since the outer diameter of the receiving portion (4) is set to be substantially equal to the outer diameter of the convex ring portion (2) of the flexible tube (1), the protective cover (6) is connected to the flexible tube (1) interconnecting portion. In this case, it is not necessary to increase the diameter, and space is saved.

A plurality of protective covers (6) are attached to a plurality of the flexible tubes (1), and the receiving ports (4) of the flexible tubes (1) have the receiving ports as shown in FIGS. Part (4) A special protective cover (6A) is attached. Like the protective cover (6), the protective cover (6A) is composed of a pair of divided members (7A, 7A) .The divided member (7A) is composed of side plates (8A, 8A) and front and rear surface plates (9A, 9A) that are orthogonal to each other. The front and rear face plates (9A, 9A) are isosceles right-angled triangles, and from the hypotenuse of the front and rear face plates (9A, 9A) are semicircular shapes that are fitting portions of the flexible tube receiving portions (4) The receiving portion fitting notches (10A, 10A) are provided. Further, a plurality of reinforcing ribs (11A) are provided between the front and rear plates (9A, 9A) of the divided member (7A). Each reinforcing rib (11A) is provided with a semicircular receiving portion fitting notch (12A) which is a receiving portion fitting portion by cutting an isosceles triangle from the oblique side. A pair of the divided members (7A) are overlapped with their hypotenuses aligned, and fixed by engaging one locking claw (13A) with the other engaging groove (14A), and a rectangular parallelepiped with front and rear surface shapes A protective cover (6A) having a shape is formed .
The protective cover (6, 6A) may be attached before, during or after the connection of the flexible tube (1). Usually, the protective cover (6, 6A) is attached by placing (fitting) the flexible tube (1) on the flexible tube fitting portion (10, 12, 10A, 12A) of one of the divided members (7, 7A). And the other divided member (7, 7A) is attached from above.

The plurality of interconnected flexible tubes (1) attached by the protective cover (6) are passed between the handholes (20, 20) as shown in FIG. In this case, as shown in FIG. 9, the receptacle member (22) is attached to the communication port (21) which is the opening of the hand hole (20). The receptacle member (22) is provided with a concave ring portion (22A) by recessing the outer periphery of the inner periphery from the root end portion, and a bell mouth portion (22B) is formed at the root end portion.
The insertion portion (5) of the flexible tube (1) located at the left end of FIG. 8 is moved out of the flexible tube insertion port (15) of the protective cover (6) as shown in FIG. (5) is fitted inside the receiving member (22) of the left hand hole (20), but is attached to the locking ring groove (5A) of the insertion port (5) of the flexible tube (1). The latching claw (17) of the latching ring (18) is engaged with the concave ring portion (22A) of the receptacle member (22) and from the receptacle member (22) of the flexible tube (1). The left hand hole (20) and the flexible tube (1) are secured by the rubber ring (19) mounted in the rubber ring mounting groove (5B) of the insertion port (5). The watertightness of the connecting part is ensured.

In connection between the other hand hole (20) and the flexible tube (1), the flexible tube (1) located at the right end in FIG. 8 corresponds to the distance between the hand holes (20, 20). And a special joint (23) is attached thereto as shown in FIG. The dedicated joint (23) is composed of a receiving block (24) of the flexible tube (1) and an insertion portion (25) inserted from one end of the receiving block (24), and the receiving block (24) Has a rectangular parallelepiped box shape, and its vertical and horizontal width is set to be the same as the vertical and horizontal width of the protective cover (6) as shown in FIG. A cut end of a flexible tube (1) with a rubber ring inserted into the receptacle block (24) is inserted into the receptacle block (24), and a pair of ribs ( 25A, 25A) and ribs (25B, 25B) are provided, and between these are mounting portions for the rubber ring (19A) and the locking ring (18B). The insertion port (25) of the dedicated joint (23) is fitted inside the receiving port member (22) of the right hand hole (20). The rubber ring (19A) of the insertion part (25) of the dedicated joint (23) ensures the watertightness of the connection part between the hand hole (20) and the flexible tube (1), and further the insertion part The locking ring (18B) of (25) prevents the insertion portion (25) from coming out of the receiving port member (22). The dedicated joint (23) can be inserted into the receiving member (22) by bending the flexible tube (1), but the dedicated joint (23) may be provided with additional performance.

  When the flexible tube (1) is formed in multiple lines, as shown in FIGS. 11 and 12, a block body (26) in which a plurality of receptacle members (22) are embedded in resin concrete in advance is opened in the hand hole (20). It may be installed on the wall with resin concrete (27).

In this way, a plurality of flexible tubes (1) covered with the protective cover (6) are passed between the hand holes (20, 20), and cables, electric wires, etc. are inserted into the flexible tubes (1). Insert. The flexible pipe (1) may be arranged side by side in the pipe groove or stacked vertically, but the protective cover (6) is a rectangular parallelepiped, so it may be closely lined up or stacked vertically. I can do it. Therefore, there is almost no air gap between the pipes or between the bottom of the protective cover (6) and the bottom of the pipe groove. The protective cover (6) is difficult to deform.
Since the flexible tube (1,1) thus constructed is completely covered with the protective cover (6,6A), shallow embedding with a soil covering of 200 mm becomes possible.
The protective cover (6) is set to a predetermined length, and a plurality of protective covers (6) are attached to the flexible tube (1) having a predetermined length. However, some flexibility is maintained, and the 3mR bend necessary for construction can be secured. When the diameter of the flexible tube (1) is 50 to 130 mm, the length of the protective cover (6) (in the tube axis direction) is preferably set to 125 to 250 mm in order to ensure the above bending.

The present invention relates to a protective cover applied when a cable or the like is laid in the ground.
A plurality of the protective covers are attached to the outside of the flexible tube to be protected, such as a cable, and protect the flexible tube from earth pressure.

1 to 14 show an embodiment of the present invention.
Flexible tube partially omitted side view Side cross-sectional view of the connection state between the receiving port and the insertion port Perspective view of split member of protective cover Perspective view of protective cover Locking ring perspective view Side sectional view of the flexible tube receiving part with the protective cover for the receiving part attached The perspective view of the division member of a protection cover only for a receiving part Explanatory drawing of the state (upper half part) where the flexible tube is handed over to the hand hole Side sectional view of the handhole connection port with the receiving member attached One end perspective view of a flexible tube covered with a protective cover Cross-sectional side view of a block with multiple receiving member embedded Perspective view of a block with multiple receiving member embedded Perspective view of the other end of the flexible tube covered with a protective cover Special joint upper half notch side view Perspective view of conventional example

Explanation of symbols

1 Flexible tube
2 Convex ring (annular ridge)
3 Concave ring part (annular concave groove)
4 Receiving part
5 Slot
6,6A protective cover
7,7A Divided parts
71,71A Overlapping surface
10,10A, 12,12A Flexible tube fitting (flexible tube insertion notch)
11,11A Reinforcement rib
13,13A, 14,14A Engagement means
15,15A Flexible tube insertion part
20 Handhole
21 Opening (contact)
22 Receptacle member
23 Dedicated fitting
24 Reception block
25 Slot

Claims (6)

It is a configuration in which a plurality of flexible tubes having an insertion port at one end and a receiving port at the other end are connected and passed between the hand holes,
It consists of a pair of divided members having a shape divided along a diagonal line of a rectangular parallelepiped, and each of the pair of divided members is provided with a flexible tube fitting portion having a semicircular longitudinal section, and the pair of divided members are connected to the flexible member. When the tube fitting portions are faced and overlapped, a flexible tube protective cover having a configuration in which a flexible tube insertion portion having a circular longitudinal section is formed by the flexible tube fitting portions of both divided members ,
Furthermore, it consists of a pair of divided members having a shape divided along a diagonal line of the rectangular parallelepiped, and each pair of the divided members is provided with a receiving portion fitting portion having a semicircular longitudinal section, and the pair of divided members are connected to the receiving portion. When the fitting parts are faced and overlapped, a protective cover for the receiving part of the configuration in which the receiving part insertion part of the circular cross section is formed by the receiving part fitting parts of both divided members is prepared,
A plurality of the protective covers are adhered and fixed along the longitudinal direction outside the flexible tube,
The protective cover of the receiving part is attached and fixed to the receiving part of the flexible tube,
When connecting a pair of the flexible tubes, one insertion portion is fitted inside the other receiving portion,
In this way, a plurality of flexible tubes are connected and in this state, the plurality of flexible tubes are inserted into the flexible tube insertion portion of each protective cover,
In both hand holes, attach a receiving member to the opening of the hand hole,
Fit the outlet portion of the flexible tube protruding from the protective cover located at one end to the receptacle member attached to the opening of one hand hole,
In the other hand hole, cut the flexible tube located at the end according to the distance between the hand holes,
At the outer end portion of the flexible tube, a dedicated joint consisting of a receiving port block of the flexible tube and an insertion port portion fed out from one end of the receiving block is attached.
The inside of the insertion port portion of the dedicated joint is fitted to the receiving member of the hand hole,
Thus, the piping structure characterized by passing a flexible tube between a pair of hand holes. The rectangular parallelepiped shape formed by overlapping the divided members of the protective cover is a square, and the length of one side of the square is set to be approximately equal to the diameter of the flexible tube to be fitted. The piping structure described in 1. The flexible tube fitted to the protective cover is an independent corrugated tube in which annular grooves and annular ridges are alternately arranged, and the flexible tube fitting of the divided member of the protective cover of the flexible tube The piping structure according to claim 1 or 2, wherein a plurality of reinforcing ribs are provided on the inner periphery of the portion along the bottom peripheral surface of the annular groove of the flexible tube. The shape of the front and rear surfaces of the rectangular parallelepiped formed by superposing the divided members of the protective cover of the receptacle is a square, and the length of one side of the square is set substantially equal to the diameter of the receptacle of the flexible tube to be fitted. The piping structure according to any one of claims 1 to 3, wherein: The piping structure according to any one of claims 1 to 4 , wherein the pair of split members are provided with mutual engagement means that engages when the pair of split members are overlapped. The receptacle block dedicated joint attached to the outer end of the flexible tube a rectangular parallelepiped box shape, the front and rear surface shapes thereof, any one of claims 1 to 5, which is the same as the longitudinal sectional shape of the protective cover The piping structure according to item 1 .