JP2000134779A - Light-weight unit tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To significantly reduce the time required for pipe line installation work and to install a large number of pipes at a time, even in a narrow working area by placing a plurality of pipes in a cylindrical outer tube forming the perimeter in the direction of the axis of the outer tube, and filling the cavity between the outer tube and each of the plurality of the pipes with a light-weight filler. SOLUTION: With respect to a light-weight unit tube 1, a pipe 12 of polyvinyl chloride, for example 200 mm in the inside diameter, is placed in the center of an outer tube 10 (for example, 700 mm inside diameter) of polyvinyl chloride, having circular cross sections and formed by injection molding. Eight pipes 14 of polyvinyl chloride, for example 150 mm in inside diameter, are placed at positions where they are inscribed in the outer tube 10, and eight pipes 16 of polyvinyl chloride, for example 100 mm in inside diameter, are placed between the pipe 12 and the pipes 14. Then the cavities between the outer tube 10 and the pipe 12, the pipes 14 and the pipes 16 are filled with a light-weight mortar 18. Four holes 20 for insertion connection anchors are formed at the location of the light-weight mortar 18. The length of the pipes 12, 14, and 16 is the same as that of the outer tube 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a porous tube used for burying a cable in the ground, and more particularly to a lightweight, compact, lightweight unit tube having various diameters.

[0002]

2. Description of the Related Art Generally, when a cable is buried underground, a conduit is first buried underground as a conduit for laying a cable, and the cable is passed through the conduit. However, when burying a large number of power cables and communication cables, a conventional general plumbing works as shown in FIG.
Pipe pillows are laid on the base plate of the excavated surface, and pipes of 2 to 4 m are piled up from below and socket-joined every span (FIGS. 4 and 5).
refer. When completed, the next span is similarly laid. After completion of the piping, backfill with sand. At this time, squeezing is performed with a square material or the like so that sand enters the gap between the pipes, and water is tightened.

[0003] The above piping method has a problem that it requires a long working time and labor, a large excavation area, and a high working cost.

Therefore, various methods have been proposed and implemented in order to facilitate the burial of a large number of cables underground. For example, a porous tube made of porcelain or concrete having a plurality of pipes as shown in FIG. Further, as shown in FIG. 6B, a bundle of flexible tubes formed by connecting a number of corrugated hard resin tubes by a spacer or a joint and connecting the tubes in the longitudinal direction has been proposed. . Furthermore, since the corrugated tube is exposed, the corrugated tube may be damaged by a crane or a stone, etc., and the backfill soil may not sufficiently enter the gap between the corrugated tubes. In addition, since the pressure cannot be applied, there is a danger that the road may collapse due to the movement of earth and sand due to rainwater or the like after the construction. Therefore, as shown in FIG. 7, a perforated pipe in which a corrugated pipe is disposed inside a rigid tubular body having a rectangular cross section and a lightweight material is filled between the tubular body and the corrugated pipe. Have been developed and proposed.

[0005]

However, in the case of the multi-story pipe shown in FIG. 3 described above, since pipes are formed by connecting single pipes of 2 to 4 m one by one to a socket, it takes a long time to work.
In addition, when backfilling with sand, it is difficult for sand to enter the gap between the tubes, and it takes time to perform the compacting operation and the water-tightening operation. Further, there is a problem that it takes time and effort for two or more people to hang a single pipe on the ground and in the excavation, and when the pipe diameter is large, the weight increases, so that it is difficult to handle it manually.

On the other hand, the perforated pipe shown in FIG. 6A is made of porcelain or concrete, so that the weight per unit length is heavy, and even if it is a 2 m perforated pipe, no machine is used. It is impossible to carry out the construction only by hand, and a machine is required to transport, lift and suspend the perforated pipe, and it is also necessary to provide access to the machine. Therefore, the construction cost increases. Conversely, a plurality of short perforated pipes of about 60 cm in length that can be handled manually can be connected in series to form a long perforated pipe, but it takes time to transport, lay and connect many perforated pipes. Labor is required, and the construction cost is rather increased.

Although the perforated pipe shown in FIG. 7 is relatively lightweight, its small size requires time and labor for transporting, laying and connecting a large number of perforated pipes as described above. The rigid tubular body having a rectangular cross section has the advantage that the pipeline is not likely to be deformed or damaged by an external impact, and that the ground does not collapse due to insufficient backfilling. However, because of its rectangular cross section, the excavation area is large, and there is a difficulty in burying it directly under the road.

As described above, the conventional means which can be used when burying a large number of conduits underground have advantages and disadvantages, and cannot be said to be practically satisfactory. .

[0009]

In order to solve the above-mentioned problems, a lightweight unit pipe according to the present invention has a plurality of pipes arranged inside a cylindrical outer pipe forming an outer periphery in the axial direction of the outer pipe. The space between the outer pipe and each of the plurality of pipes is filled with a lightweight filler.

Also, as many small-diameter pipes as possible are provided between the large-diameter pipe disposed at the center of the outer pipe and the large-diameter pipe disposed concentrically with the outer pipe. Are arranged and configured.

The outer pipe and the inner pipe are made of paper or recyclable resin.

A plurality of anchor insertion holes are provided in an end face filler portion of the lightweight unit tube, and a plurality of the lightweight unit tubes are joined by inserting an anchor into the hole. It is characterized by having a cylindrical collar surrounding the outer tube for waterproofing and protecting the joint.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The lightweight unit pipe of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a sectional view of an end face of a lightweight unit tube of the present invention, and FIG. 2 is a side view thereof, showing before and after joining of the lightweight unit tubes. The lightweight unit tube 1 of this figure is an outer tube 10 (outer diameter 720
mm, an inner diameter of 700 mm, and a length of 4000 mm).
0, eight vinyl chloride pipes 16 having an inner diameter of 100 mm are disposed between the pipes 12 and 14, and each of the outer pipes 10, the pipes 12, the pipes 14, and the pipes 16 is disposed between the pipes 12 and 14. Light mortar 18 is filled. In addition, four holes 20 (inner diameter 32 mm, depth 200 mm) for the insertion connection anchor are provided at the light mortar 18. The pipes 12, 14, 16 are the outer pipe 10
And both ends are in the same plane as both ends of the outer tube 10.

FIG. 2 is a side view showing a connection state of the lightweight unit tube 1. A connection collar (inner diameter 720 mm, length 400 mm) 2 is attached to one side of the lightweight unit tube 1 shown in FIG.
2 is inserted deeply in advance, and the metal rod 24 of the anchor is positioned so as to be inserted into the hole 20. FIG.
(B) shows a state in which the metal rod 24 is inserted into both holes 20 of the lightweight unit tubes 1 and 1 and the connection collar 22 is pulled back so as to surround the joint.

Here, the piping process of the underground pipeline using the lightweight unit pipe 1 will be described in comparison with a conventional general piping process. First, a description will be given of a step of piping nine lines of a conventional reinforced plastic composite pipe (hereinafter, referred to as PFP). FIG. 9 is a flowchart of the piping step.
As shown in FIG. 3, a conventional general pipe is provided with a base slab 33 for one span (step 901). Tube pillow 35 on it
a is set (step 902). Next is the lower PFP3
1 is inserted and fitted into the tube pillow 35a, and then the socket 37a is joined (step 903). Similarly, pipe pillow 3 for middle-stage laying
5b is installed (step 904). Next is the middle PFP
After inserting and fitting 31 into the tube pillow 35b, the socket 37b is joined (step 905). Similarly, the upper laying pipe pillow 35c is installed (step 906). Next is the upper PF
After inserting and fitting the P31 into the pipe pillow 35c, the socket 37c is inserted.
(Step 907). Next, the upper, middle, and lower PFPs 31 are fixed with bands (step 90).
8). Thus, one span is completed, and the same steps are repeated for the next span installation. FIGS. 4 and 5 show how the PFP 31 and the socket 37 are joined.

After completion of the piping, backfill with sand is performed. At this time, squeezing is performed with a square material or the like so that sand enters the gap between the pipes, and water is tightened.

Next, the step of piping the lightweight unit pipe of the present invention will be described. FIG. 8 shows a flowchart of the piping process. In the plumbing process, first, the foundation sand for one span is performed (Step 801). The light unit tube is placed thereon and joined to the existing light unit tube by using an insertion anchor (step 802). Next, a collar is fitted to the joint surface to achieve waterproofing and protection (step 803). Thus, one span is completed, and the same steps are repeated for the next span installation.

In the conventional piping process, one cycle was performed in steps 901 to 908.
One cycle is from 01 to 803, and the work efficiency is improved. In addition, the efficiency increases as the number of pipes increases. Further, in the backfilling work, the gap between the pipes is filled with the lightweight mortar at the time of manufacturing the lightweight unit pipe, so that the sand filling work on site is very efficient.

At a construction site, there are many narrow work zones, and if the unit pipes are heavy, a tow truck or the like is required, and it is difficult to lay in a predetermined work zone. In the lightweight unit tube of the present invention, the outer tube used as the mold material is made of a recycled material such as paper or vinyl chloride, and the voids therein are filled with lightweight mortar, so that the weight is reduced. Incidentally, the lightweight unit tube of the present invention can be manufactured at about 1000 kg per 4 m of span length. Further, in the above embodiment, since only 17 pieces are hung down just by hanging down one piece, it is possible to reduce the trouble of hanging down by two or more persons in the related art.

The small-diameter pipe of φ100 provided in the lightweight unit pipe of the present invention is a main pipe (φ200, φ200).
Not only does it provide a spacing of φ150), but it also serves as a spacer to keep the tubes from slipping when filling the voids in the lightweight mortar. Further, even after the light unit pipe is buried, it becomes possible to connect to a φ100 pipe without excavating the ground when it becomes necessary to insert an optical cable in the future.

[0021]

According to the lightweight unit pipe of the present invention, the construction time for laying the pipe can be greatly reduced. In addition, since the weight is reduced, it is possible to lay multiple pipes at once even in a narrow work zone.

Furthermore, a large number of small-diameter pipelines can be simultaneously laid in addition to the large-diameter pipeline used as a main, so that it can be quickly adapted to future applications.

[Brief description of the drawings]

FIG. 1 is a sectional view of an end face showing an embodiment of a lightweight unit tube of the present invention.

FIG. 2 is a side view showing a connection state of the lightweight unit pipe shown in FIG. 1, wherein (a) shows a state in which the connection anchor is positioned so as to be inserted into one of the pipes before joining the lightweight unit pipe. (B) shows the state after bonding.

FIG. 3 shows an example of piping construction of a conventional underground pipe (a).
Is a side view, and (b) is a cross-sectional view.

FIG. 4 is a view for explaining the socket joining in FIG. 3;
It shows the joining state by the retractor.

FIG. 5 is a view for explaining the socket joining in FIG. 3;
This shows a joining state by hammering.

FIG. 6 is a perspective view of a conventional bundled body of a perforated tube and a flexible tube.

FIG. 7 is a perspective view showing another example of a conventional perforated tube.

FIG. 8 is a piping process flowchart of the lightweight unit pipe of the present invention.

FIG. 9 is a flowchart of a piping process of a conventional underground pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light-weight unit pipe 10 Outer pipe 12,14 Large-diameter pipe 16 Small-diameter pipe 18 Light-weight mortar 20 Connection anchor insertion hole 22 Connection collar 24 Connection anchor 31 Underground pipe PFP 33 Foundation sheet 35 Pipe pillow 37 Socket 41 Pull-in machine 43 Rope 45 backing plate 51 hammer 53 wood

Claims (4)

[Claims] A plurality of pipes are arranged in a cylindrical outer tube forming an outer periphery in an axial direction of the outer tube, and a gap between the outer tube and each of the plurality of pipes is filled with a lightweight filler. Lightweight unit pipe characterized by comprising. 2. A small-diameter pipe as large as possible between a large-diameter pipe disposed at a center position of the outer pipe and a large-diameter pipe disposed at a concentric position of the outer pipe inside the outer pipe. The lightweight unit pipe according to claim 1, wherein the light unit pipe is arranged. 3. The lightweight unit pipe according to claim 1, wherein the outer pipe and the inner pipe are made of paper or recyclable resin. 4. A structure in which a plurality of anchor insertion holes are provided in an end face filler portion of the lightweight unit tube, and a plurality of the lightweight unit tubes are joined by inserting an anchor into the hole. 4. The lightweight unit tube according to claim 1, further comprising a cylindrical collar surrounding the outer tube for waterproofing and protecting the joint.