JPH0722989Y2 - Underground electric wire burying protection tube - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a protective tube for embedding an underground electric wire for accommodating an electric wire cable such as an electric power line and burying the electric wire in the ground, and protecting the electric wire cable from underground soil, water, etc., more specifically, 3 The present invention relates to a protective tube for underground electric wires that can be bent and piped in a dimension.

[Prior art]

Conventionally, protective tubes that can be buried underground are used to cover electric cables such as power lines, and are mainly made of hard synthetic resin in order to protect the cables from soil and water in the ground. Specified length standard (1,2,4m) of 3 kinds of straight pipes and prescribed curvature standard (curvature radius; 5,10,15,25m) etc. prescribed length standard (1,2m) 8 types of curved tubes and the like were used as a set.

[Problems to be solved by the device]

However, if the curvature of the curved pipe does not match the curvature of the site, it is time consuming because equipment is provided to make curved pipes with different curvatures, or straight pipes are heated and bent. There were drawbacks such as. Even if such a curved pipe or a straight pipe is used, it is three-dimensionally bent, for example, from a flat land toward a slope or along a curved road, avoiding other underground facilities such as water and sewerage. There is also a drawback that piping cannot be performed when piping adjacent pipes to each other in a twisted position, especially when the bending is large. Further, even if the pipe can be bent three-dimensionally in this way, the pipe is not bendable due to an impact such as an earthquake, a vibration caused by running of a vehicle on the ground, or a subsidence of the ground due to a change in the crust. Therefore, there is also a defect that a part of the straight pipe or the bent pipe is bent and damaged. The present invention has been made in view of the above circumstances, and it is possible to easily perform three-dimensional piping, and further, even if an external impact is applied to the piping, the piping does not change flexibly and is not damaged.
It is an object of the present invention to provide a protective tube in which an underground electric wire can be freely embedded, which is excellent in hermetically sealing a pipe connecting portion.

[Means for Solving the Problems]

According to the present invention, both pipes are connected to both ends, and at least two connecting pipes are connected between the pipes, and a connecting portion in which at least a part of an outer peripheral surface bulges spherically, and a spherical shape of the connecting mouth. The above object is achieved by connecting by a receiving port having an inner peripheral surface rotatably fitted to the portion, and by providing packings on both sides of the maximum bulge portion of the spherical portion as a center. . In this case, in order to prevent the connecting portion of the pipe from coming off, it is preferable to fasten a metal wire or the like to the outer peripheral surface of the receiving port between the front end of the receiving port and the packing position provided on the front end side of the receiving port.

[Action]

According to the configuration of the present invention, the spherical portion of the outer peripheral surface of the receptacle rotates along the inner peripheral surface of the receptacle so that the socket and the receptacle are connected within the rotatable solid angle range. The flag pipe and the connecting pipe or the connecting pipes bend each other.
Then, such a bent portion exists in a complicated portion, and the bent portion of the complicated portion is freely bent, so that three-dimensional bending is performed. In addition, a protective tube that can be buried underground is used when energizing the stored electric cable, for example, 60 ° in the case of a power cable.
When the temperature rises by about C, the pipe expands, and conversely, in winter, the temperature in the ground decreases and the pipe contracts.
Then, when a force is applied to the protective tube that can bury underground cables, due to such expansion and contraction, the above-mentioned earthquake, vibration due to vehicle traveling on the ground, or impact such as subsidence of the ground due to changes in the crust, The flexible tube for free embedding of electric wire bends freely at the connection part, and changes and damage due to expansion and contraction and shock are avoided. At the same time, a force is exerted between the outlet connecting the pipes and the receiving outlet, either in the direction of pulling the outlet out of the receiving outlet or in the direction of pushing the outlet into the receiving outlet. Here, the space between the outlet and the receiving port swells at the maximum in the approximate center, and thus has a structure that narrows from the approximate center toward the tip direction of the outlet and the distal direction of the receiving port. When a force is applied in the direction of pulling out, the gap between the outlet and the receiving end at the receiving end disappears, and the outlet and the receiving end come into good contact, so the packing located near the tip of the receiving end It works strongly. Conversely, if a force is applied in the direction of pushing the receptacle from the outlet, the gap between the outlet at the end on the outlet side will disappear and the outlet will come into good contact. The packing located near the tip of the mouth acts strongly. Furthermore, when the hoop is fastened to the outer peripheral surface of the receiving port between the tip of the receiving port and the packing position provided on the front end side of the receiving port, the force acts in the direction in which the outer peripheral surface of the receiving port works due to the hoop, and at the same time, packing is performed. As a result, a force acts in the direction in which the outer peripheral surface of the receptacle at the packing position rises. Therefore, the presence of the packing enhances the force of cutting into the outer peripheral surface of the receiving opening of the hoop, so that the pipe is prevented from coming out at the connecting portion. In addition, since the force acts in the direction of narrowing and eliminating the gap between the outlet and the receiving port due to the hoop, the sealing property between the outlet and the receiving port is synergistically improved together with the packing.

【Example】

Hereinafter, the present invention will be described in more detail with reference to embodiments with reference to the drawings. 1 to 6 show an example of a protective tube for embedding an underground electric wire according to the present invention. The underground electric wire-embedded protective tube 1 shown in FIG. 1 has a structure in which outlet pipes 2 are provided at both ends and a plurality of connecting pipes 3, 3, ... Are connected between them. On the other hand, in the underground electric wire burying protection tube 1 shown in FIG. 2, the outlet tube 2 is arranged at one end and the receiving tube 4 is arranged at the other end, and a plurality of connecting tubes 3, 3 ,.・ The structure is connected. The underground electric wire burying protection tube 1 shown in FIG. 3 has a structure in which receiving pipes 4 are arranged at both ends, and a plurality of connecting pipes 3, 3, ... Are connected between them. The protective tube 1 for embedding an underground electric wire in FIGS. 4 to 6 is the protective tube 1 for embedding an underground electric wire in FIGS. 1 to 3, respectively.
The tag 11 is fastened to the outer peripheral surface of the receiving port 32 between the tip of the receiving port 32 and the packing 10 near the receiving end 32 of the receiving port 32, and the packing 10 and the switching action 11 will be described later. The above underground electric wire burying protection tube 1 is made of a hard synthetic resin or the like, and as shown in FIG. 7, for example, the pipe line 7 of the underground 6 from the manhole 5 to the next manhole (not shown) It is used by connecting to a straight pipe 8 and a curved pipe 9 other than this region A in a partial region A that needs to be bent and piped three-dimensionally. Therefore, the outlet of the outlet pipe 2 has a structure in which the conventional straight pipe 8 and the bent pipe 9 can be connected to the conventional pipe, and the receiving pipe 4 can receive the straight pipe 8 and the curved pipe 9 by connecting them. There is. FIG. 8 to FIG. 10 show a part of the implementation of the connecting pipe forming a part of the bendable protective pipe 1 for an underground electric wire, respectively. The connecting pipe 3 in FIG. 8 has an outlet 31 at one end and a receiving end 32 at the other end.
The connecting pipe 3 in FIG. 9 has a structure of
The connecting pipe 3 shown in FIG. 10 has a receiving port 32 at both ends. As shown in FIG. 11, all of the above-mentioned outlets 31 and 32 of the pipe connecting portions of the outlet pipe 2, the connecting pipe 3 and the receiving pipe 4 are spherical in shape. And the spherical portion of this outlet on the inner peripheral surface of the receiving port 32.
A recessed portion 32a that loosely fits into 31a is formed, and the inside of the receiving opening 32 is widened toward the tip from the inside at a predetermined inclination angle, and the receiving opening 32 is within the range of a predetermined solid angle regulated by the end widening portion 32b. The spherical body portion 31a of the spigot 31 is rotated along the recessed portion 32a to bend the tube body 30. Further, as shown in FIG. 12, between the outlet 31 and the receptacle 32, between the substantially central position 31o where the bulge of the spherical portion 31a is maximum and the tip of the receptacle 31 and the tip of the receptacle 32. Packing 10 is provided in two places. The packing 10 is made of an annular elastic body which is fitted in an annular groove 31v formed on the outer peripheral surface of the outlet 31 and has an outer ring portion 10a slightly protruding, as shown in FIG. , As shown in FIG. 13b, the gap between the outlet 31 and the receiving opening 32 disappears,
When the outlet 31 and the receiving opening 32 come into strong contact with each other, they are deformed to seal the space between the outlet 31 and the receiving opening 32. The hoops 11 in the buried protective tube for underground electric wires 1 shown in FIGS. 4 to 6 are the packing 10 and the receptacle 32 near the tip of the receptacle 32 of the buried protective tube for underground electric wires 1 as already described. It is fastened to the outer peripheral surface of the receiving port 32 between the tips of the two. The mode of fastening the hoop includes, for example, the modes shown in FIGS. That is, as in the case of No. 14a, the tag 11 having a circular cross section can be directly tightened to the outer peripheral surface of the receiving port 32 to perform the tag tightening. However, this tag 11 has the short section 11 shown in FIG. 14d.
Alternatively, the hoop 11 having an elliptical cross section shown in FIG. 14d or the hoop 11 having an L-shaped cross section shown in FIG. 14e may be used. Further, as shown in FIGS. 14c and 14d, an annular groove is formed on the outer peripheral surface of the receiving port 32.
32v is formed and the tab 11 is fitted in the groove 32v, or as shown in FIG. 14e, a groove 32v having an L-shaped cross section is formed in which the tab 11 is fitted from the outer peripheral surface to the end surface of the receiving port 32.
The hoop 11 can have various shapes such as the hoop 11 may be fitted in the groove 32v. As is clear from the mode of tightening the hook, the underground electric wire burying protection tube of the present invention can be variously modified within the scope of the utility model registration claim.

[Effect of device]

As described above, the underground electric wire burying protection tube of the present invention has an outer peripheral surface at least a part of which is bulged spherically, and a spherical portion of the socket rotatably fitted. Since it is connected by the receiving port having the inner peripheral surface,
With this outlet and the receiving port, it is possible to easily bend the pipe three-dimensionally, and the pipe can be bent freely even if an external impact is applied to the pipe and is not damaged. Further, since packing is provided at two places between the maximum bulge of the spherical portion between the outlet and the receiving end and the tip of the receiving end and the tip of the receiving end, the direction in which the outlet is pulled out from the receiving end. , And the packing provided at the above-mentioned two places exerts a strong force no matter which force acts in the direction of pushing the outlet into the receiving port, the sealing performance of the pipe connecting portion is excellent. Furthermore, when the tab is tightened on the outer peripheral surface of the receiving port between the tip of the receiving port and the packing position provided on the front end side of the receiving port, the packing and the tag reinforce each other's actions to prevent the pipe from coming out. The prevention is strong and the tightness of the pipe connection is improved.

[Brief description of drawings]

1 to 6 are cross-sectional views showing an example of an embodiment of a protection tube for embedding an underground wire of the present invention, which is different from each other, and FIG. 7 is a piping state of a protection tube for embedding an underground wire according to the invention. 8 to 10 are sectional views showing connection pipes according to the present invention, which are different from each other.
FIG. 11 is a drawing for explaining the operation of the pipe connecting portion of the underground electric wire burying protection pipe according to the present invention, and FIG. 12 shows the pipe connecting portion of the underground electric wire burying protection pipe according to the present invention. FIG. 13a is a partial sectional view showing a packing according to the present invention, FIG. 13b is a drawing for explaining the function of the packing of FIG. 13a, and FIGS. Figure 14e
FIG. 4 is a cross-sectional view of a pipe connecting portion of an underground electric wire burying protection tube showing a mode of tightening a tag according to the present invention, which are different from each other. 1 …… Protective tube for burying underground cable freely, 2 …… Inlet tube, 3…
… Connecting pipe, 30 …… Pipe main body, 31 …… Inlet, 31a …… Spherical part, 31o …… Approximate central position, 31v …… Groove, 32 …… Receiving port, 32a …… Recess, 32b …… Spreading Part, 32v ……
Groove, 2 ... Receiving pipe, 5 ... Manhole, 6 ... Underground,
7 ... Piping line, 8 ... Straight pipe, 8 ... Bend pipe, 10 ... Packing, 10a ... Outer ring part, 11 ... Tag.

Claims (5)

[Scope of utility model registration request] 1. A connecting portion of both pipes having at least two connecting pipes connected to both ends thereof, and a connecting portion in which at least a part of an outer peripheral surface bulges spherically, and a spherical surface of the connecting opening. Embedded in an underground electric wire, which is connected to a receiving port having an inner peripheral surface rotatably fitted in a cylindrical portion, and packing is provided on both sides of the maximum bulge portion of the spherical portion as a center. Flexible protection tube. 2. The both end tubes are both spout tubes.
Protective tube for buried underground electric wires. 3. The underground electric wire burying protection tube according to claim 1, wherein one end pipe is an outlet pipe and the other end pipe is a receiving pipe. 4. Both end tubes are receiving tubes.
Protective tube for buried underground electric wires. 5. The underground electric wire embedding according to any one of claims 1 to 4, wherein a tag is fastened to the outer peripheral surface of the receiving opening between the tip of the receiving opening and the packing position provided on the front end side of the receiving opening. Flexible protection tube.