JP3199710B2 - Connection structure of cable protection tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a power cable,
Regarding a cable buried pipeline network buried in the ground as a pipeline network for burying cables such as communication cables (hereinafter referred to as power cables etc.), in particular, a concrete box and a cable The present invention relates to a connection structure for a protection tube.

[0002]

2. Description of the Related Art In order to bury power cables and the like underground, a cable buried pipeline network is stretched underground. In the cable buried pipeline network, concrete boxes such as handholes and manholes are arranged at predetermined intervals, and adjacent concrete boxes are connected to each other by a cable protection tube. The power cable and the like are housed in the cable protection tube, and branch and connect the power cable and the like in the concrete box. The concrete box is placed in a place where branching and connection of a power cable or the like is necessary as described above, and is also placed in a place where a new power cable or the like needs to be pulled in or pulled out. An example of such a concrete box is disclosed in JP-A-10-30.
No. 4543. In this case, a synthetic resin panel is fitted on the side of the concrete box, and a connection tube corresponding to a cable protection tube with a different inside diameter is formed in advance on this panel, and a cable protection tube with the corresponding inside diameter is attached to the connection tube. It is to let. This has the advantage that the strength is improved by the connecting cylinder, and the connecting work in the field is reduced and the working efficiency is improved.

[0003]

However, since the type and number of actually buried power cables and the buried height vary depending on the buried place, the cable protection tube in which the power cables and the like are installed is provided. Also, the diameter, buried height and the like of the panel must be different for each panel. That is,
The cable protection tubes are not always connected to the panel in the same arrangement and connection position. Therefore, in order to cope with such a situation, it is necessary to prepare in advance various panels having different connection tube sizes and forming positions, and to select and use the most optimal panel from the installation situation of the cable protection tube at the site. Was. However, preparing various types of panels in this way requires preparing a mold for manufacturing each panel, which increases the cost of panel production. Also,
Since various panels must be stocked, more storage space is required than when only a single panel is stored, and dead stock is more likely to occur. In this case, it is necessary to form a through hole in this panel without forming a connection tube at all, that is, as a mere plate-shaped panel (to increase the thickness to increase strength), and to insert a cable protection tube in the field. However, it is necessary to form a through-hole and maintain the watertightness. In the first place, with such a configuration, there is not much difference from the operation of attaching the cable protection tube to the conventional concrete side wall. The present invention has been made to solve such a conventional problem. An object of the present invention is to provide a connection structure of a cable protection tube which can be easily attached / detached, maintains watertightness, and can correspond to various arrangements / connection positions.

[0004]

Means for Solving the Problems In order to solve the above problems, according to the invention of claim 1, a part of a cable buried pipeline network stretched underground to bury power cables and the like underground. In the connection structure for fitting a synthetic resin panel into the opening formed on the side of the concrete box to be buried underground and connecting the resin protective cable tube to the through hole formed in the panel The outer cylinder having an insertion portion having an external thread formed on the outer periphery and having a flange integrally formed around the base of the insertion portion is inserted into the concrete box through the through hole of the panel, and the internal thread is inserted into the inner periphery. An inner cylinder formed integrally with a flange formed in contact with a peripheral edge of the through-hole of the panel is disposed in the concrete box, and a female screw of the inner cylinder is screwed into a male screw of the insertion portion. The outer cylinder or inner cylinder while Fu塞the clearance holes around the insertion portion by the two furan <br/> di is pressed against the same two flange against the panel by screwing relationship between screw and the female screw The gist is that the cable protection tube is connected to the cable. In such a configuration, first, a through hole is formed in the panel, and the insertion portion of the outer cylinder is inserted into the through hole from outside the concrete box. Then, the inner tube is arranged so as to be concentric with the inserted portion which has entered the inside of the concrete box, and the male screw of the inserted portion and the female screw of the inner tube are screwed together. Then, the flange and the abutting portion relatively approach each other, and an outer flange from the outside of the panel is brought into contact with the periphery of the through-hole to close the through-hole and to prevent the inside of the panel from closing .
The other flange is brought into contact with the periphery of the inner through-hole. And
Both flange is brought into pressure contact with the firmly panel by screwing the male screw and the female screw. At this time, the through-hole must be large enough not to protrude when the flange contacts the panel.For example, if the through-hole and the flange are circular and concentric, the through-hole has a smaller diameter than the flange. It is said. Next, a cable protection tube is connected to the outer tube or the inner tube.

According to the second aspect of the present invention, a power cable or the like is formed on the side surface of a concrete box for underground burial forming a part of a cable buried pipeline network laid underground to bury the cable underground. In the connection structure for fitting a synthetic resin panel into the opening formed and connecting the resin protective cable protection tube to the through-hole formed in the panel, the outer peripheral portion has a projecting portion formed with an external thread. An internal cylinder integrally formed with a flange abutting on the periphery of the through hole of the panel at the base of the projection is disposed in the concrete box, and the projection is projected from the through hole of the panel to the outside. and forming on the surface, said inner tube fixing member which is integrally formed a flange Fu塞the gap of the projecting portion around the hole is disposed outside of the concrete box, the the protruding portions of the external thread the inner tube fixing portion The internal thread is screwed, while Fu塞the gap hole of the insertion portion around the same flanges is pressed against the same two flange against the panel by screwing relationship between the male screw and the female screw, the internal The gist is that the cable protection tube is connected to a tube or an inner tube fixing member. In such a configuration causes the first contact from the outside of the concrete boxes for panel drilled a hole DoToruana the flange of the inner tube fixing member from outside through hole periphery of the panel. On the other hand, a female screw of the male screw and the inner tube fixing member protrusions protruding the Rutotomoni protrusions abut the flange of the inner tube from the inside to the hole periphery of the panel <br/> Le to the outside from the through hole of the panel Screw. Then the two flanges
There relatively close brought into pressure contact with the firmly panel by screwing the male screw and female screw. At this time, the through-hole must be large enough not to protrude when the sealing portion comes into contact with the panel.For example, if the through-hole and the sealing portion are perfectly circular and concentric, the through-hole is The diameter is smaller than the sealing part. Next, a cable protection tube is connected to the outer tube or the inner tube.

[0006] In the present invention of claim 3 in addition to the configuration of the invention described in claim 1, wherein the outer tube is a gist that it is connected by integral molding on the tip of the cable protection tube. In the invention 請 Motomeko 4 in addition to the configuration of the invention described in any one of claims 1 to 3, in between the flange and the panel thereof that is interposed a sealing member surrounding the hole Make a summary. With this configuration, the watertightness is improved because the flange approaches the panel on the periphery of the through hole and the seal member is disposed therebetween. According to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect , a fixing means for temporarily fixing the seal member is formed on the flange. With this configuration, the connection work of the cable protection tube can be performed after the sealing members are temporarily fixed to both flanges in advance. Claim
The gist of the invention described in Item 6 is that, in addition to the invention described in any one of Claims 1 to 5 , the panel has a reinforcement structure.

[0007]

According to the first aspect of the present invention, a through hole is formed in the panel according to the arrangement state of the cable protection tube, and the outer tube and the inner tube are screwed to each other. for connecting work of the cable protection tube to the concrete box is completed by simply connecting the cable protection tube, with easily accommodate operation of connecting the cable protection tube of various arrangement circumstances, hole periphery the inside and outside of the panel Pressure welding with flange
Therefore, the watertightness is further improved . According to the invention described in claim 2, a through hole is formed in the panel according to the arrangement state of the cable protection tube, the inner tube fixing member and the inner tube are screwed to each other, and further, the inner tube fixing member or the inner tube is fixed to the inner tube fixing member or the inner tube. Since the connection of the cable protection tube to the concrete box is completed just by connecting the cable protection tube, it is possible to easily cope with the connection work of the cable protection tube in various installation situations,
Pressing the periphery of the through hole from inside and outside of the panel with a flange
Therefore, the watertightness is further improved . According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 , the cable protection tube can be simply inserted into the concrete box through the through hole through the insertion portion in front of the cable protection tube and screwed to the inner tube. The connection work can be made much more efficient because it can be mounted. In the invention described in claim 4 , claims 1 to
In addition to the effects of the invention described in any one of 3 above, the watertightness is further improved. In the invention described in claim 5 , claim 4 is provided.
In addition to the effects of the invention described in (1), the sealing member can be temporarily fixed to both flanges in advance, so that it is not necessary to add a hand to dispose the sealing member, and the operation is made more efficient. In the invention described in claim 6 , in addition to the effect of the invention described in any one of claims 1 to 5 , the strength of the panel is improved.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, “front” refers to the left in FIGS. 2, 10, 14, and 15, and “back” refers to the right in each of the drawings. Embodiment 1 As shown in FIG. 1, a cable buried pipeline network is buried underground mainly from the viewpoint of landscape and safety. The hand hole 11 and the cable protection tube 12 made of reinforced concrete as the concrete box of the present embodiment form a part of a cable buried pipeline network. A power cable and the like (not shown) are housed in a cable protection tube 12 and branched and connected in the handhole 11. As shown in FIGS. 1 and 2, the handhole 11 is a rectangular parallelepiped box, and the outer shape is constituted by a main body 13 and a lid C serving as a ceiling surface. A substantially square opening 14 is formed in both short side surfaces 13a in the short direction of the main body 13 (only one is shown in FIG. 1), and a panel 15 is mounted in the opening 14.

As shown in FIGS. 1, 6A and 6B, the panel 15 of the present embodiment is a square plate made of recycled plastic. The front and back surfaces of the panel 15 are parallel and smooth plate surfaces. A reinforcing rib 17 is formed along the periphery of the panel 15. The reinforcing ribs 17 are formed thicker than other parts of the panel. Bolt insertion holes 18 are formed in the four corners of the panel 15, and are screwed to the handhole 11 side by bolts 16 through the insertion holes 18. In the present embodiment, the thickness of panel 15 is 40 m.
m, and the reinforcing rib 17 has a thickness of 70 mm.
In addition, since the handhole 11 of the present embodiment does not have the panel 15 attached to both long side surfaces 13b in the longitudinal direction from the viewpoint of strength, as shown in FIG. The cable protection tube 12 is connected to fill the gap with mortar or the like.

As shown in FIGS. 1 to 3, the cable protection tube 12 is a flexible, elongated, cylindrical body made of hard polyethylene, and has an outer peripheral surface 12a having a substantially rectangular cross section at a predetermined pitch. A concave stripe 21 and a convex stripe 22 are formed. A spiral ridge 23 is formed on the inner peripheral surface 12b of the cable protection tube 12, so that the contact area with a power cable or the like to be installed is reduced. A first flange 25 is formed on the outer periphery of the distal end of the cable protection tube 12. The first flange 25 has a perfect circular outer peripheral shape, and a front surface 25a that is in contact with the surface of the panel 15 is formed smoothly. As shown in FIGS. 2 and 3, a concave portion 24 is formed annularly near the periphery of the front surface 25a. A cylindrical insertion tube 27 as an insertion portion is formed in front of the first flange 25. A male screw 28 having a substantially trapezoidal cross section is formed on the outer peripheral surface 27 a of the insertion tube 27. Inner peripheral surface 27b of insertion tube 27
Is formed continuously with the inner periphery 12b of the cable protection tube 12 without any step. The outer peripheral surface 27a of the insertion tube 27 is formed in a tapered shape so that the diameter becomes smaller toward the distal end. The inner peripheral surface 27a of the insertion tube 27 is
It is formed continuously without a step from b. The outer peripheral surface 27a of the insertion tube 27 is formed in a tapered shape so as to have a larger diameter toward the rear end.

Next, a handhole 1 will be described with reference to FIGS.
The inner cylinder 31 disposed in the inside 1 will be described. The inner cylinder 31 made of hard polyethylene has a trumpet-shaped expanded portion 30 which is expanded toward the front in the front thereof, and a second flange 32 is formed at the rear end. The power cable and the like are guided without being bent by the inner peripheral surface of the expanding portion 30. The second flange 32 has a perfect circular outer peripheral shape, and a rear surface 32 a that is in contact with the rear surface of the panel 15 is formed smoothly. As shown in FIGS. 2 and 4, a concave portion 33 is formed annularly near the peripheral edge of the rear surface 32a. A female screw 35 having a substantially trapezoidal cross section corresponding to the male screw 28 is formed on the inner peripheral surface 31 a of the inner cylinder 31.

Next, a connection operation for connecting the cable protection tube 12 to the handhole 11 will be described. FIG.
As shown in (a) and (b), the panel 15 is set in the opening 14 of the handhole 11, and the bolt 16 is inserted into the handhole 11 through the bolt insertion holes 18 at the four corners of the panel 15.
To fix the panel 15. Next, a through hole H is formed at a predetermined position by a boring machine (for example, a saw) not shown. The through hole H has a diameter larger than the largest diameter portion of the insertion tube 27 of the cable protection tube 12, and the first and second holes are provided when the cable protection tube 12 and the inner tube 31 are mounted.
It is necessary that the diameter be such that it does not protrude from the O-ring 37 attached to the flanges 25, 32 of the above. In parallel with such a drilling operation, as shown in FIG.
The O-ring 37 made of a solid and flexible synthetic rubber shown in FIG. Similarly, although not shown, the same O-ring 37 is fitted into the concave portion 33 of the second flange 32. The O-ring 37 is deformed in the fitted state, and is pressed against the inner walls of the recesses 24 and 33 by its own elastic force so that it does not come off easily. As shown in FIG. 7, the O-ring 37 slightly protrudes from the front surface 25 a of the first flange 25 in a state fitted in the recess 24. Although not shown, the O-ring 37 fitted into the concave portion 33 of the second flange 32 also slightly projects from the rear surface 32a.

[0013] The insertion tube 27 of the cable protection tube 12 of the cable protection tube 12 to which the O-ring 37 has been mounted as described above.
From the through hole H into the handhole 11. Since the first flange 25 abuts on the surface of the panel 15 on the periphery of the through hole H, it cannot enter any further. In the present embodiment, a slight gap is formed around the insertion tube 27 when the first flange 25 contacts the surface of the panel 15.
Next, the O-ring 3
The rear end (on the side of the second flange 32) of the internal cylinder 31 on which the mounting of the tube 7 has been completed is abutted against the distal end of the insertion cylinder 27. Then, the male screw 28 and the female screw 35 are screwed together while rotating the cable protection tube 12 and the inner tube 31 relatively. Since the distance between the first and second flanges 25 and 32 is reduced with the screwing, the two flanges 25 and 32 are pressed against the panel 15 from both the inner and outer surfaces. The O-ring 37 is crushed by the pressing, and completely seals the periphery of the through hole H as shown in FIG. In this state, the cable protection tube 12 is firmly fixed to the side surface of the panel 15.

With this configuration, the present embodiment has the following advantages. (1) The cable protection tube 12 and the inner cylinder 31 are simply rotated and connected to each other to connect the cable protection tube 12 to the panel 1.
5, the work efficiency can be extremely improved. (2) The first and second flanges 25 and 32 are pressed against the panel 15 from both inside and outside surfaces to maintain watertightness, and can be completely closed by the O-ring 37, so that the structure is simple. Extremely high watertightness. (3) Panel 15, cable protection tube 12, and inner tube 31
Are all made of synthetic resin,
It is possible to collectively recycle at the time of replacement, so that resources are not wasted and industrial waste is reduced. (4) It is sufficient that the diameter does not protrude from the O-ring 37 to the outside even if the through hole H that is exactly the same as the outer diameter of the cable protection tube 12 is not formed. That is, the cable protection tube 12 of various diameters is
It is sufficient to drill a through hole H of approximately the diameter in accordance with each cable protection tube 12, so that the work efficiency at the site is greatly improved. (5) The O-ring 37 can be fitted and engaged with the recesses 24 and 33 in advance, so that the O-ring 37 does not have to be attached to the O-ring 37 and the working efficiency is improved. (6) Since the male screw 28 and the female screw 35 are tapered screws, they are tightly tightened and the watertightness is improved.

(Embodiment 2) Hand hole 11 and panel 15 according to Embodiment 2
Has the same configuration as that of the first embodiment, the same reference numerals are given and the description thereof is omitted. The second embodiment is different from the first embodiment in that an outer tube 41 as an inner tube fixing member is formed separately from the cable protection tube 55. As shown in FIGS. 9 to 11, the outer cylinder 41 made of hard polyethylene is composed of a cylindrical main body 42 and a first flange 43 as a sealing portion formed at a peripheral edge of the distal end of the main body 42. . A female screw 4 having a substantially trapezoidal cross section is provided on the inner peripheral surface 42a of the main body 42.
The first flange 43 on which the front surface 4 is formed has a perfect circular outer peripheral shape, and a front surface 43 a contacting the surface of the panel 15.
Are formed smoothly. As shown in FIGS. 11 and 12, an annular recess 45 is formed near the periphery of the front surface 43a.

Next, the inner cylinder 46 provided in the handhole 11 will be described with reference to FIGS. The inner cylinder 46 is formed with a trumpet-shaped expanded portion 47 which is expanded forward toward the front end, and a second flange 48 as a contact portion is formed at a rear end thereof. Expansion part 4
The inner peripheral surface of 7 guides the power cable and the like without bending. The second flange 48 has a perfect circular outer peripheral shape, and a rear surface 48a that is in contact with the rear surface of the panel 15 is formed smoothly. As shown in FIG. 11, a concave portion 49 is formed annularly near the periphery of the rear surface 48a. A cylindrical protruding cylinder 50 is formed as a protruding portion further rearward from the second flange 48. On the outer peripheral surface 50a of the protruding cylinder 50, a male screw 51 having a substantially trapezoidal section is formed to be screwed into a female screw 44 formed on the main body 42 of the outer cylinder 41. The outer peripheral surface 50a of the protruding cylinder 50 is formed in a tapered shape so as to have a smaller diameter toward the rear end. The inner peripheral surface 50b of the protruding cylinder 50 is formed continuously with the inner peripheral surface 46b of the inner cylinder 46 without any step. A large-diameter portion 56 is formed at the tip of the cable protection tube 55 in which the power cable and the like are installed (in the direction of connection with the outer tube 41). The large-diameter portion 56 has an inner diameter slightly larger than the outer diameter of the main body 42 of the outer cylinder 41, and the front end of the main body 42 is formed at a stepped portion 56 a formed between the cable protection tube 55 and the large-diameter portion 56. Be abutted.

Next, a connection operation for connecting the cable protection tube 12 to the handhole 11 will be described. FIG.
3 (a) and 3 (b), the panel 15 is set in the opening 14 of the hand hole 11, and the bolt 16 is inserted into the hand hole 1 through the bolt insertion holes 18 at the four corners of the panel 15.
1 and the panel 15 is fixed. Next, a through hole H is formed at a predetermined position by a boring machine (for example, a saw) not shown. This through hole H has a diameter larger than the largest diameter portion of the protruding cylinder 50 of the inner cylinder 46 and the first and second flanges 4 when the outer cylinder 41 and the inner cylinder 46 are mounted.
It is necessary that the diameter be such that it does not protrude outside from the O-ring 37 attached to 3, 48. In parallel with such a drilling operation, the recesses 45 of the first flange 43 and the recesses 49 of the second flange 48 are inserted into the recesses O shown in FIG.
The ring 37 is fitted. The O-ring 37 is deformed in the fitted state, and is pressed against the inner walls of the recesses 45 and 49 by its own elastic force so that the O-ring 37 does not come off easily. The O-ring 37 slightly protrudes from the front surfaces 43a, 48a of the first and second flanges 43, 48 in a state fitted in the recesses 45, 49.

The protruding cylinder 50 of the inner cylinder 46 on which the O-ring 37 has been mounted as described above is projected from the inside of the handhole 11 to the outside through the through hole H. Since the second flange 48 is in contact with the back surface of the panel 15 on the periphery of the through hole H, there is no further projection. In the present embodiment, a slight gap is formed around the protruding cylinder 50 when the first flange 43 contacts the surface of the panel 15. Next, from the outside of the handhole 11, the front end of the external cylinder 41, on which the O-ring 37 has been mounted, is similarly butted against the rear end of the protruding cylinder 50.
Then, the external thread 41 and the internal thread 41 are relatively rotated, and the male screw 51 and the female screw 44 are screwed together. Since the distance between the first and second flanges 43 and 48 is reduced with the screwing, the flanges 43 and 48 are pressed against the panel 15 from both the inner and outer surfaces. The O-ring 37 is crushed by the pressing, and completely seals the periphery of the through hole H as shown in FIG. In this state, the outer cylinder 41 is firmly fixed to the side surface of the panel 15. Then, an adhesive G is applied to the main body 42 of the outer cylinder 41, and the front end of the main body 42 is guided into the large-diameter portion 56 so that the cable protection tube 55 abuts on the stepped portion 56a. Stick.

With this configuration, the present embodiment has the following advantages. (1) A terminal for connecting the cable protection tube 55 can be easily formed simply by connecting the outer tube 41 and the inner tube 31 by relative rotation, and the efficiency of connection work of the cable protection tube 55 is greatly improved. (2) The first and second flanges 43 and 48 are pressed against the panel 15 from both inside and outside surfaces to maintain watertightness, and can be completely sealed by the O-ring 37, so that the structure is simple. Extremely high watertightness. (3) Since the panel 15, the outer cylinder 41, and the inner cylinder 31 are all made of synthetic resin, they can be collectively recycled when the handhole 11 is replaced, so that resources are not wasted and industrial waste is eliminated. It will reduce things. (4) The first flange 43 is formed on the outer cylinder 41 without forming a through hole H which is exactly the same as the outer diameter of the cable protection tube 12.
It is sufficient that the diameter of the through hole H is such that it does not protrude from the O-ring 37 attached to the outside. (5) The O-rings 37 can be fitted and engaged with the recesses 45 and 49 in advance, so that the O-rings 37 need not be attached to the O-rings 37, thereby improving work efficiency. (6) Since the external thread 51 and the internal thread 44 are tapered threads, they are tightly tightened and the watertightness is improved.

(Embodiment 3) In Embodiment 1, the outer tube is formed integrally with the cable protection tube 12. However, as shown in FIG. 14, a separate outer tube 58 may be used. In the third embodiment, the outer cylinder 58
The rear of the main body 59 is a large-diameter bulging portion 60. The distal end of the cable protection tube 61 is inserted into the bulging portion 60 and fixed via an O-ring 62. The present invention can be embodied with the following modifications. -As shown in FIG. 15, the insertion tube 2 of the cable protection tube 12
The inner tube 31 may be formed to be longer than the above embodiment so as to protrude inward from the front end of the inner tube 31, and a trumpet-shaped cable guide member 63 may be further attached to the distal end of the insertion tube 27. A guide ring 64 having a guide surface 64a formed on the inner peripheral surface for guiding a power cable or the like is attached to the rear end (the handhole 11 side) of the inner cylinder 31, but this is not necessarily required. -As shown in FIG.
5 may be arranged between the panel 15 and the first flange 25. This further improves the water tightness. Further, a packing 40 may be provided instead of the O-ring 37. Although not shown, the packing 65 may be provided between the panel 15 and the second flange 32. You may arrange in both.

The second flange 32 on the side of the inner cylinder 31 may not necessarily be such a flange having watertightness. The contact portion that contacts the panel 15 may simply be formed. The O-ring 37 is provided between the recess 24 of the first flange 25 and the second
Of the flange 32, but may be arranged in only one of them. -The shape of the 1st and 2nd flanges 25 and 32 is not limited to the thing of the said embodiment. The concave portions 24 and 33 are not necessarily required if the O-ring 37 is provided by hand. For example, in FIG. 10, the main body 42 may be omitted, and the first flange 43 and the female screw 44 on the inner periphery thereof may be used. In this case, the design of the distal end of the cable protection tube 55 is slightly changed so that the cable protection tube 55 is connected to the protruding tube 50. In the above embodiment, the material of the panel 15 is recycled plastic (recycled polyester, recycled polypropylene, recycled polyethylene terephthalate, etc.). However, if it is made of a synthetic resin, it is not limited to the material of the above embodiment. Although the cable protection tube 12 and the inner tube 31 are made of hard polyethylene, other materials may be used as long as they are made of synthetic resin. For example, polypropylene, vinyl chloride, recycled plastic, or the like can be used. The reinforcing ribs 17 of the panel 15 are not always necessary if the thickness of the panel 15 is sufficient. Even if necessary, the present invention is not limited to the above embodiment. As shown in FIG. 16, a concave portion 71 as a reinforcing structure may be formed on the rear surface side (hand hole 11 side) of the panel 70. By doing so, the watertightness inside the handhole 11 is slightly inferior to the above embodiment, but the strength of the panel 70 itself is improved. The shape of the concave portion 71 may be a circle or a honeycomb structure in addition to such a square. In addition, the present invention can be freely implemented without departing from the gist of the present invention.

Other technical ideas of the present invention that can be grasped from the above embodiment will be described below as supplementary notes. (1) The connection structure for a cable protection tube according to any one of claims 2 to 4, wherein the sealing member is an endless flexible member surrounding the through hole.

[0023]

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an embedded state of a cable embedded pipeline network.

FIG. 2 is an essential part cross-sectional view for explaining a connection state between the panel and the cable protection tube according to the first embodiment.

FIG. 3 is a perspective view of a cable protection tube and an inner tube.

FIG. 4 is a perspective view of the inner cylinder of the same first embodiment.

FIG. 5 is an explanatory view showing a state before a cable protection tube is connected in the first embodiment.
(B) shows a state after the panel is mounted, (c) shows a state where a through hole is formed in the panel, and (d) shows a state where a cable protection tube is connected.

6A is a front view of the panel, and FIG. 6B is a longitudinal sectional view.

FIG. 7 is a side view of a principal part on a partially broken side of the cable protection tube according to the first embodiment.

FIG. 8 is a partially broken perspective view of an O-ring.

FIG. 9 is a perspective view illustrating an embedded state of a cable embedded pipeline network.

FIG. 10 is an essential part cross sectional view for explaining a connection state between the panel and the cable protection tube according to the second embodiment;

FIG. 11 is a perspective view of a cable protection tube and an inner tube.

FIG. 12 is a perspective view of the inner cylinder of the first embodiment.

FIG. 13 is an explanatory view showing a state before a cable protection tube is connected in the same first embodiment.
(B) shows a state after the panel is mounted, (c) shows a state where a through hole is formed in the panel, and (d) shows a state where a cable protection tube is connected. FIG.

FIG. 14 is an essential part cross sectional view for explaining a connection state between the panel and the cable protection tube according to the third embodiment.

FIG. 15 is a cross-sectional view of a cable protection tube and an inner tube according to another embodiment.

FIG. 16 is a perspective view of a panel according to another embodiment as viewed from the back side.

[Explanation of symbols]

11 ... handhole as a concrete box, 1
2 ... cable protection tube, 15 ... panel, 24 ... recess as fixing means, 25 ... first flange, 27 ... insertion tube, 2
8 ... male thread, 31 ... inner cylinder, 32 ... second flange, 3
3 ... recess as fixing means, 35 ... female screw, 37 ... O-ring as sealing member, 41 ... outer cylinder, 43 ... first flange, 44 ... female screw, 45 ... recess as fixing means, 46 ... inner cylinder, 48: second flange, 49: concave portion as fixing means, 55: male screw, 65: packing as seal member, 70: panel, H: through hole.

Claims (6)

(57) [Claims] 1. An underground concrete box forming a part of a cable buried pipeline network stretched underground to bury power cables and the like underground. A connection structure for fitting a resin-made panel and connecting a resin-made cable protection tube to a through hole formed in the panel, wherein the connection part has an insertion part having an external thread formed on an outer periphery thereof and a base part of the insertion part. Insert the insertion part of the outer cylinder integrally formed with a flange around the perimeter into the concrete box from the through hole of the panel, form a female screw on the inner peripheral surface, and integrate the flange that contacts the perimeter of the through hole of the panel. the formed internal tube disposed within the concrete boxes, screwed an internal thread of the inner tube to the external thread of the insertion portion, the two flanges by screwing relationship between the male screw and the female screw
And press-fit against the same panel to seal the gap between the through holes around the insertion portion by the two flanges, and connect the cable protection tube to the outer tube or the inner tube. Construction. 2. An opening formed on a side surface of a concrete box for burying underground which forms a part of a cable laying pipeline network laid underground to bury power cables and the like underground. In a connection structure for fitting a resin panel and connecting a resin protection cable to a through-hole formed in the panel, the panel has a protruding portion having an external thread formed on the outer periphery and a base portion formed on the protruding portion. An internal cylinder integrally formed with a flange abutting on the peripheral edge of the through hole of the panel is disposed in the concrete box, and the protruding portion is protruded to the outside from the through hole of the panel. And an internal cylinder fixing member integrally formed with a flange that seals a gap between the through holes around the projection is disposed outside the concrete box, and an external thread of the projection is Thread female screw Is allowed, the two flanges by screwing relationship between the male screw and the female screw
And press-fit against the same panel to seal the gap between the through holes around the insertion portion by the two flanges, and connect the cable protection tube to the inner cylinder or the inner cylinder fixing member. Pipe connection structure. 3. The connection structure for a cable protection tube according to claim 1, wherein the outer tube is connected to a tip of the cable protection tube by integral molding. 4. The connecting structure of the cable protection tube according to any one of claims 1-3, characterized in that by interposing a sealing member surrounding the hole is between the flange and the panel. 5. The connection structure for a cable protection tube according to claim 4, wherein fixing means for temporarily fixing the seal member is formed on the flange. 6. The connection structure of the cable protection tube according to any one of claims 1 to 5, wherein the panel is characterized in that the reinforcing structure is applied.