JPH1137387A - Cable protecting tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the workability in the execution field, and to surely achieve the watertightness on a tube connecting part. SOLUTION: An interpolation tube 2 having a structure that one edge is an acceptor, and the other edge is a spigot, is inserted inside of an outer tube in a condition that one of the acceptor 2a and the spigot 2b is projected from a tube edge face, a collar tube 3 is slidably fitted to one edge part of the external tube, and a packing 4 such as a rubber ring or the like is held between the collar tube 3 and the external tube 1, whereby the tube can be easily connected without performing a work such as the fastening of a bolt or the like, which takes some time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable protection tube used for protecting power and communication cables buried underground.

[0002]

2. Description of the Related Art In order to protect a power / communication cable buried underground by inserting it into a protective tube, there are a single conduit assembly system and a perforated tube integrated system.

The single pipe assembly method is a method of assembling a single pipe such as a hard vinyl chloride pipe, a steel pipe, a centrifugal reinforced concrete pipe, a reinforced plastic composite pipe, etc. at a construction site by using a spacer formed in a predetermined cross section. It is.

[0004] This method has advantages in that, especially when a rigid vinyl chloride pipe or a reinforced plastic composite pipe is used as a single pipe, the joint section is excellent in watertightness and the pipe is hardly pulled out due to ground displacement.

However, the single-pipe assembly method requires a lot of man-hours for assembling work at a construction site, and cannot meet recent demands for shortening the construction period, saving labor and reducing costs. Are often adopted.

In this perforated tube integrated system, JIS C 3653 "Method of burying power cables underground" is used as a protective tube.
And a perforated concrete pipe conforming thereto.

[0007] The integrated perforated pipe system using these protective tubes has advantages over the single tube assembly system, such as the elimination of on-site assembly work and the reduction of working space.

[0008]

However, according to the above-described conventional perforated pipe integrated system, a rubber packing is disposed at the pipe end face of the perforated pipe, instead of stopping the water alone at the pipe joint. The packing is compressed by bolting to stop the water, so that there is a problem that the watertightness of the joint cannot be secured due to the unevenness of the construction.

Further, since the material of the perforated pipe is made of ceramics or concrete, the weight per unit volume is large and the total weight is large. Therefore, when the ground is poor such as soft ground, ground improvement and foundation reinforcement are required. There are problems such as the need to take measures.

In addition, since the perforated pipes are connected by bolting, there is no room for connecting the pipes at the joints, and it is not possible to cope with slipping out due to ground displacement. Further, there is a problem that a porous tube made of ceramics or concrete is not flexible and has very poor seismic performance.

In terms of workability on site, the perforated pipe becomes a short pipe due to the weight problem, resulting in an increase in the number of joints. There is a problem.

The present invention has been made in view of such circumstances, and provides a cable protection pipe having a structure that is excellent in workability at a construction site and that can reliably obtain watertightness at a pipe joint. With the goal.

[0013]

In order to achieve the above object, a cable protection tube according to the present invention, as shown in FIGS. 1 to 3, has an outer tube 1, an end 2a at one end, and a plug 2a at the other end. Mouth 2
b, at least one inner tube 2,... 2 inserted into the outer tube 1 so that either the receiving port 2a or the inlet 2b protrudes from the tube end face, and A member (for example, a foam filler 5) arranged inside the tube 1 for fixing the inner intubation 2... 2 at a predetermined position in the outer tube 1 and a short tube having an inner diameter larger than the outer diameter of the outer tube 1; It is characterized by being constituted by a collar tube 3 slidably fitted into one end of the outer tube 1 and a packing (for example, a rubber ring 4) sandwiched between the collar tube 3 and the outer tube 1. Attached.

According to the cable protection tube of the present invention having the above-described structure, as shown in FIGS. 4 to 6, the connection is performed while the collar tube 3 is slid to a position where it does not protrude from the tube end surface of the outer tube 1. Centering of the intubation tubes 2 and 2 (FIG. 4)
Next, after inserting the insertion port 2b of the other intubation 2 into the socket 2a of the other intubation 2 to be connected and joining them together (FIG. 5), the outer tube 1 is returned by returning the collar tube 3 to the original position. In the procedure of joining (1) and (1), pipe joining can be performed with a simple operation without requiring a complicated operation such as bolting.

Further, by sliding the collar tube 3 at the time of connection, as shown in FIG. 5, it is possible to visually confirm the joining state of the insertion tubes 2 and 2, so that the alignment and joining of the insertion tubes 2 can be reliably performed. Can be done. Furthermore, outer tube 1
Since the inner tube and the outer tube are joined to each other in the double tube structure of the inner tube 2 and the inner tube 2, high watertightness can be secured.

In the present invention, when a plurality of inner tubes are inserted into the outer tube to form a cable protection tube having a porous structure, the inner tubes can be arranged at equal intervals in a prefabricated state. In addition to the need for stacking work, the centering and joining of the intubation can be performed at once.

The outer pipe used for the cable protection pipe of the present invention may be a vinyl chloride pipe with ribs as shown in FIG. 1, or a rigid vinyl chloride pipe, a reinforced plastic composite pipe, a polyethylene pipe, or the like. The tube is not particularly limited as long as it can withstand the pressure.

As the intubation tube, a hard vinyl chloride tube or a polyethylene tube is preferable. As the color tube, a tube made of a high-strength material such as stainless steel or FRP is preferable.

In the cable protection tube of the present invention, as a member for fixing the inner tube at a predetermined position in the outer tube, a foam filler 5 as shown in FIGS. 1 and 2 or a member as shown in FIGS. The spacer 15 having the exemplified shape is exemplified.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing the structure of the embodiment of the present invention, and FIG. 2 is a view taken in the direction of arrow A in FIG.
FIG. 3 is a sectional view of a main part showing a structure of the intubation tube 2.

The cable protection tube shown in FIG. 1 mainly comprises an outer tube 1, inner tubes 2,..., A collar tube 3, a rubber ring 4, and a foam filler 5. The outer tube 1 is a vinyl chloride tube (length 4000 mm, inner diameter 200 mm) with a highly rigid rib integrally formed with circumferentially extending ribs 1 a.
It is a pipe having the strength to withstand the force acting when buried underground.

Inside the outer tube 1, there are four inner tubes 2.
Are arranged rotationally symmetrically about the tube axis of the outer tube 1. The inner tube 2 is a rigid vinyl chloride tube, as shown in FIG. 3, one end of which is a receiving opening 2a having an enlarged diameter structure, and the other end of which is an inlet 2b, and the inlet 2b projects from the tube end surface of the outer tube 1. ing. A recess 2d is formed in the receiving port 2a, and a rubber ring 2c functioning as a packing when the insertion port 2b is inserted is fitted into the recess 2d.

Rubber rings 4 are attached to both ends of the outer tube 1, respectively. Also, one end of the outer tube 1 (the inner tube 2
A stainless steel collar tube 3 whose inner diameter is larger than the outer diameter of the outer tube 1 is fitted with a rubber ring 4.
Is pressed down. The rubber ring 4 is compressed with a force that can secure watertightness between the color tube 3 and the outer tube 1 and with a force enough to manually slide the color tube 3 with respect to the outer tube 1. I have.

The gap between the outer tube 1 and each inner tube 2 is filled with urethane resin of 5 to 30 times foaming from one end to the other end of the outer tube 1 densely. Each of the intubation tubes 2... 2 is fixed at a predetermined position in the outer tube 1 by the filler 5.

Next, the construction procedure of the above embodiment will be described below with reference to FIGS. First, as shown in FIG. 4, the color tube 3 is slid toward the existing tube (manual operation).
Then, it is arranged at a position where it does not protrude from the tube end surface of the outer tube 1, and in this state, the insertion port 2 b of each of the existing intubation tubes 2,
The centering of each of the newly inserted intubation tubes 2 with the receiving port 2a is performed.

At this time, since the insertion port 2b and the receiving port 2a of the intubation tube 2 are exposed to the outside, the centering can be performed accurately. Next, as shown in FIG. 5, the new pipe is moved toward the existing pipe side, and the insertion port 2b of the existing inner pipe 2 is inserted into the receiving port 2a of the new insertion pipe 2 so that the new pipe is connected to the existing pipe. The newly installed intubation tubes 2 and 2 are joined to each other.

During this joining operation, the insertion port 2b and the receiving port 2a are exposed to the outside, and the operation can be performed while visually confirming the joining state. Can be.

After the above-mentioned joining of the intubation 2 is completed, FIG.
As shown in (1), the color pipe 3 is manually pulled back to the new pipe side and the outer pipes 1 and 1 are joined to complete the connection work for one pipe. Thereafter, the cable protection pipes are sequentially connected in the same procedure. Connect to.

FIG. 7 is a schematic sectional view showing the configuration of another embodiment of the present invention, and FIG. 8 is a view taken in the direction of arrow B in FIG. In this embodiment, a hard vinyl chloride tube (without ribs) is used as the outer tube 11, and five inner tubes 2 are arranged inside the tube.
2 is fixed by a spacer (made of resin) 15. As the intubation tube 2, a rigid vinyl chloride tube having the same structure as that of the previous embodiment, that is, a rubber ring receiving port at one end and an insertion port at the other end is used, and the fixing spacer 15 is It is arranged at three places, both ends and the center of the outer tube 11.

Further, in this embodiment, since a simple pipe having no ribs or the like on the outer peripheral surface is used as the outer tube 11, a watertightness between the outer tube 11 and the collar tube 13 is ensured. The rubber rings 14,.
It is attached to the three sides by bonding or the like.

In the embodiment shown in FIG. 7, as in the previous embodiment, the sliding of the collar tube 13 → the joining of the inner tube 2 → the joining of the outer tube 11 by pulling back the collar tube 13; In this way, pipe joining can be performed without performing a troublesome operation such as bolting.

Here, in each of the above two embodiments, the insertion side of the intubation protrudes from the outer tube, but the present invention is not limited to this. The present invention can also be implemented as a form protruding from the outer tube. Further, the mounting position of the collar tube on the outer tube end is not limited to the insertion side of the intubation, but may be the reception side of the intubation.

Further, the connection structure for the intubation is shown in FIG.
In addition to the structure using a rubber ring as shown in FIG. Further, in the above embodiment, the example of the cable protection tube having a porous structure in which a plurality of inner tubes are arranged in the outer tube has been described, but the present invention is not limited thereto.
The present invention can also be applied to a case in which one inner tube is arranged in an outer tube to form a protective tube having a one-hole structure.

[0034]

As described above, according to the cable protection tube of the present invention, one end is provided with a receiving port, and the other end is provided with an inserting tube having an insertion structure, and the receiving port or the insertion port is projected inside the outer tube. While inserting in a state, the inner tube is fixed at a predetermined position in the outer tube with a foam filler or a spacer,
The outer tube is provided with a collar tube and packing such as a rubber ring at the end of the outer tube, so that joining work at the construction site can be performed easily without the need for troublesome work such as bolting. Can be.

In addition, since the joining state of the intubation can be visually checked, the centering and joining of the intubation can be reliably performed, and the double tube structure of the outer tube and the intubation can be achieved.
Since the inner tube and the outer tube are joined together,
High watertightness can be ensured.

Further, since the inner tube is fixed by filling the outer tube with urethane foam or by arranging a resin spacer in the outer tube, a conventionally used porous ceramic tube, porous concrete tube, or the like is used. There is also an advantage that it is very lightweight as compared with.

In the present invention, when a plurality of inner tubes are inserted into the outer tube to form a cable protection tube having a porous structure, the inner tubes can be arranged at equal intervals in a prefabricated state. This eliminates the need for stacking work, and allows the centering and joining of the intubation to be performed at once.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a structure according to an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a cross-sectional view showing a main part structure according to the embodiment of the present invention.

FIG. 4 is an explanatory view of a construction procedure according to the embodiment of the present invention.

FIG. 5 is an explanatory view of the construction procedure.

FIG. 6 is an explanatory view of the construction procedure.

FIG. 7 is a schematic sectional view showing the structure of another embodiment of the present invention.

8 is a view taken in the direction of arrow B in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer tube 1a Rib 2 Inner tube 2a Receptacle 2b Inlet 2c Rubber ring 3 Color tube 4 Rubber ring 5 Foam filler

Claims (1)

[Claims] 1. An outer tube, at least one of which has a receiving port at one end and a pipe having an inlet structure at the other end, and at least one of which is inserted into the outer pipe such that either the receiving port or the inlet port protrudes from the pipe end face. An inner tube, a member arranged inside the outer tube for fixing the inner tube at a predetermined position in the outer tube, and a short tube having an inner diameter larger than the outer diameter of the outer tube, slidable on one end of the outer tube. A cable protection tube consisting of a collar tube fitted into a tube and a packing sandwiched between the collar tube and the outer tube.