JPH0472013B2 - - Google Patents

Description

[Detailed description of the invention] ○ Industrial field of use A plurality of cables buried underground, such as wired broadcasting lines, telephone lines, power lines, etc., water pipes, gas pipes, sewer pipes, hot water pipes for district heating, etc. This relates to an underground communal conduit that accommodates several conduits.

○ Conventional technology Underground communal ditches with a square cross section that are constructed from the road using the open cut method are well known.

○ Problems that the invention aims to solve When constructing a public ditch using the conventional method, when constructing it underground of a completed road, it is an open construction method, so it is difficult to destroy the road and rebuild the underground joint after the ditch is completed. The disadvantage is that restoration is required and construction costs increase.

Furthermore, in order to cope with the increase in road earth pressure due to the recent increase in the number of heavy transport vehicles, underground common trenches with square cross sections have the disadvantage that the strength of the trench walls must be increased.

○ Means for solving the problem Based on the invention filed in 2011, opposing shafts provided at appropriate intervals are connected with a group of circular cross-section pipes that can be constructed using a shield construction method such as the push pipe construction method. forming a pipe and dividing the inside of the circular cross-section pipe in the vertical direction,
In addition to providing a plurality of conduit chambers for storing conduits such as pipes and cables and electric lines, a small branching chamber is provided on the side of the circular cross-section conduit and adjacent to the outer peripheral surface of the circular cross-section conduit. , the branching small chamber is communicated with a conduit chamber above the lowest conduit chamber among the plurality of conduit chambers in the circular cross-section conduit, and the conduit chamber excluding the lowest conduit chamber A small branching chamber that communicates with the pipe is installed on the side of the circular cross-section pipe.

A second invention of the present application provides, in the first invention, about a plurality of pipe chambers formed in the circular cross-section pipe,
At least the lowermost conduit chamber and the other conduit chambers are sealed, and the lowermost conduit chamber and the small branching chamber are shut off.

○ Example In the first example shown in FIGS. 1 to 3,
The shaft 1 is a reinforced concrete box constructed from the ground using an open cut method, and upon completion by the construction staff, a top wall 1a will be formed and the box will be sealed. The top wall 1a is equipped with a manhole 2 or an opening 3.
Install the shielding plate 3' to block the area. The shaft 1 has a shape and volume that provides sufficient space for shielding a circular section pipe. In addition, holes 5 for pulling out pipes such as gas pipes and water pipes, and electric cables such as power lines and telephone lines are provided in the upper part of the side wall 1b of the shaft 1, and in the top wall 1.
Provided at a.

The opposing shafts 1 and 1 are communicated with each other through a horizontal hole formed by a group of circular-section tubes 10. A group of circular cross-section pipes 10 includes circular cross-section pipes 1 buried using a shield construction method (for example, a push pipe construction method).
The circular section pipe 11 is made of a resin concrete pipe, a fume pipe, a cast iron pipe, etc., which are generally widely used for sewerage using the shield method, in order to reduce costs. The desired number and cross section of pipe chambers vary depending on the cables and pipes to be accommodated, so we range from large diameter ring-shaped cast iron pipes of 5mφ and 3mφ to 20cmφ and 10cmφ.
The diameter, length, and material may be appropriately selected and used, such as a small-diameter pipe-like hume tube.

A side wall 1b of the shaft 1 is provided with a pipe hole 1c into which a circular cross-section pipe 11 is inserted. After completion of the circular section tube group 10, the gap between the cross section tubes 11 at both ends and the tube hole 1c is closed with cement or the like, and the circular section tube group 10 and the shaft 1 are closed.
is sealed to the earth.

A plurality of conduit chambers A, B, C, D, . . . are formed by partition means 12 inserted into the circular cross-section tubes 1 in the tube-like space of the circular cross-section tube group 10.

The partition means 12 includes horizontal plates 7, 7, 7 and a vertical plate 8.
It is also possible to create a completely isolated and nearly sealed room by combining [side plates 9 are added if desired], but as in the second embodiment shown in Fig. 4, horizontal bars 4, vertical bars 6, It may be partitioned by a lattice-like framework by combining the connecting horizontal rods 13, and cables, conduits, etc. may be fixed on the horizontal rods 4. Further, a support plate 15 and a partition plate 16 may be added. In short, any structure is sufficient as long as it can support the cables and conduits to be accommodated by classifying them by type.Except in special cases, it is not necessary to isolate each conduit chamber A, B, etc. from each other in a sealed state. It's not something you do.

Next, in the third embodiment shown in FIG.
FRP pipe) 20A, 20B, 20c and partition rod 1
9, and the first group of conduit chambers A1, A2...
, the second group of conduit chambers B1, B2..., and the third group of conduit chambers C1, C2... are arranged concentrically,
Concentric FRP pipes 20A, 20B, 2 with different diameters
The inside of the circular section tube group 10 is divided by the 0C and the partition rod 19.

The edge of the FRP pipe 20 inserted into each circular cross-section pipe 11 is inserted into the adjacent circular cross-section pipe group 10.
By adhering to the edge of the FRP pipe 20, each group of conduit chambers A1, A2..., B1, B2..., C
1, C2... and the inner wall of the circular section tube 11 can be sealed together.

In this case, the third group of conduit chambers C1 and C2 on the outer peripheral side
By using ... as a technical line for local distribution pipes to each building, each home, etc., and using the central side as a direct main line that does not require branching, accommodating gas pipes, power lines, etc.
Separate retraction through the branching chamber 14 adjacent to the circular section tube 11 is facilitated. Furthermore, when using a large-diameter circular section tube 11, the center can be used as a passage for maintenance.

Regarding the FRP pipes 20 with different diameters, the diameters are
It is convenient to prepare standard products that correspond to the inner diameter dimensions of concrete pipes of various sizes, with dimensions slightly smaller than the standard inner diameter dimensions of the general mass-produced concrete pipes and castings that make up the circular section pipe 11. be.

wiring. When it comes to piping, each house will be installed from shaft 1.
Circular cross section pipe 1 is introduced into the store or building through hole 5.
In order to handle the case where it is necessary to draw out the cable or conduit P to a building or the like located between 0 and 0, a small branching chamber 14 is attached as shown in FIG. 6. It goes without saying that the branching chamber 14 has a size that ensures a space and a shape that allow branching and drawing of pipe lines that require branching and drawing.

The branching chamber 14 is manufactured by burying cast-in-place concrete or a secondary concrete product manufactured in a predetermined shape, and a pull-out hole 21 facing the introduction hole 17 is formed in the circular section pipe 11 using a diamond cutter or the like. . Manhole 1 in hole 22
8 in series and connect wiring and piping to buildings etc.
It is drawn directly into the basement of the building through hole 23. In addition, if necessary, transformer room, power distribution room, piping room, etc. 24,
The branch chamber 14 is attached to the shaft 1, or the branch chamber 14 is installed inside the shaft 1.

It is sufficient that the branching chamber 14 communicates with at least one of the road chambers A, B, . . . . Cables and conduits P from a plurality of conduit chambers A, B .

Note that the branching chamber is provided adjacent to the side surface of the circumferential surface of the circular section tube 11.

In addition, conduit rooms A, B, C or C1, C2...
are in a sealed state with each other, the branching small chamber 14 is communicated with a plurality of conduit chambers (for example, in FIG. 3, it communicates with three conduit chambers A, B, and D), and each conduit is Necessary cables and circuits P are branched from the room to the branching small room to facilitate the addition of individual wiring and piping to buildings, etc. after the underground common conduit is completed.

○ Effects of the invention Since the present invention is a system in which circular cross-section pipes are continuous through a shaft for shield construction, it is easy to branch cables and pipes using the shaft, and underground pipes in urban areas can be easily branched. Facilitates individual wiring and piping to buildings, houses, etc. on roads.

Furthermore, in the present invention, since the branching chamber is provided at a desired location on the side of the circular section pipe, wiring from an appropriate location between the above-mentioned shafts to a building, etc. facing the pipe, is possible. It facilitates the branching of piping and can also be used as a transformer room, etc., thereby increasing the effectiveness of underground common conduits with wiring and piping in urban areas.

In addition, since the branching chamber is provided adjacent to the outer peripheral surface of the circular section pipe, the distance between the top surface of the branching chamber and the ground surface should be greater than the distance between the top surface of the circular section tube and the ground surface. Even if a small branching chamber is provided, there will be no hindrance caused by vehicles running on the ground above the circular section pipe.

Furthermore, the branching small chamber is communicated with a pipe chamber above the lowest pipe chamber among the plurality of pipe chambers in the circular cross-section pipe, so that the branching small chamber and the circular cross-section pipe are connected to each other. Since the communication position was set above the lowest conduit chamber,
When the lowermost pipe room is used as a drainage channel for water and sewage water or a circular section pipe, it is possible to prevent wastewater from flowing into the branching chamber.

The second invention of the present application provides a method of sealing at least the lowermost pipe chamber and the other pipe chambers with respect to the plurality of pipe chambers formed in the circular cross-section pipe. Since the branching chamber was cut off,
Cables, conduits, etc. can be branched to buildings, branch pipes, etc. via branching chambers while ensuring a sealed state for the conduit chamber at the lowest level. Therefore, when the lowermost pipe room is used as a water supply/sewerage channel or a drainage channel with a circular section pipe, the branching chamber must be securely sealed with the water supply, sewage, drainage channel, etc., and the electrical circuit inside the branching chamber should be It is possible to maintain good electrical insulation of communication channels, electrical equipment, etc., and has the effect of increasing the utility value of this type of underground common conduit.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an underground pipeline in which the present invention is implemented. FIG. 2 is a longitudinal sectional view taken along line S-S in FIG. 1. FIG. 3 is a longitudinal sectional view taken along line S--S in FIG. 1. FIG. 4 is a longitudinal sectional view showing a second embodiment of the partitioning means, and FIG. 5 is a longitudinal sectional view showing the third embodiment. FIG. 6 is a plan view illustrating cables, conduit wiring, and piping according to the present invention. DESCRIPTION OF SYMBOLS 1... Vertical shaft, 10... Circular section pipe group, 11... Circular section pipe, 12... Partition means, 14... Small chamber for branching.

Claims (1)

[Scope of Claims] 1. A plurality of shafts are provided at appropriate intervals, and the adjacent shafts are connected by a group of circular cross-section pipes that can be constructed using a shield method to form a circular cross-section pipe, and the circular cross-section The inside of the conduit is separated by a partition member, and a plurality of conduit chambers are provided for accommodating conduits such as pipes, cables, and electric lines, and the outer periphery of the circular cross-section tube is located on the side of the circular cross-section conduit. A small branching chamber is provided adjacent to the surface, the small branching chamber is communicated with a conduit chamber above the lowest conduit chamber among the plurality of conduit chambers in the circular section conduit, and An underground common conduit characterized in that a small branching chamber that communicates with a conduit room other than a conduit room is provided on the side of a circular cross-section conduit. 2. A plurality of shafts are provided at appropriate intervals, and a circular cross-section pipe is formed by connecting the adjacent shafts with a group of circular cross-section pipes that can be constructed using the shield method, and a circular cross-section pipe is formed in the vertical direction within the circular cross-section pipe. A plurality of pipes are provided in a conduit chamber for storing conduits such as pipes, cables, etc. and electric lines, and branching pipes are provided on the side of the circular cross-section conduit and adjacent to the outer circumferential surface of the circular cross-section conduit. A small chamber is provided, and the branching small chamber is communicated with a part of the plurality of conduit chambers in the circular cross-section conduit except for the lowest conduit chamber, and the plurality of conduit chambers formed in the circular cross-section conduit are An underground common conduit characterized in that, for each conduit room, at least the lowest conduit chamber and other conduit chambers are sealed, and the lowest conduit chamber and the small branching chamber are isolated. .