JPH0337377B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention provides a cable common trench in which an underground conduit for accommodating power, telegraph, etc. cables that occupy roads is constructed as a covered trench block with a cross passage. This is related to the improvement of.

Conventional technology In the past, power and telegraph cables were mainly overhead wires supported by utility poles, but in order to prevent disaster prevention activities and to improve the urban landscape, the cables were moved underground. It has been proposed for a long time. However, since the construction cost of undergrounding electric cables is more than ten times that of overhead lines, implementation is slow and slow, so it is recommended to construct an underground path with a simple structure of covered ditch blocks on the sidewalk, which is therefore cheaper to construct. However, a method of jointly accommodating overhead lines was studied and constructed on a trial basis (for example, "Underground Distribution Lines and the Cab System" in the preface of the May 1984 issue of the Economic Research Institute, pp. 6-7). description). As mentioned above, this method has a simple structure with a lid installed on the ground surface, so it is a useful method as the construction cost is low, the construction period is shortened, and the maintenance and repair of the cable is easy. Further, US Pat. No. 3,815,304 discloses a groove structure in which a side wall of a base portion is raised up to form a groove and a cable or the like is passed through the base portion.

Problems to be Solved by the Invention However, in order to lead the cables suspended on the side walls of the common trench from each side to the outside of the other side, they must traverse the trench. The crossing of dissimilar cables into the groove, especially cables which usually require consideration of separation distances, is undesirable and can interfere with subsequent work. In addition, since the vertical and transverse cross-sectional slopes of the road surface and the cover surface must be the same, it will be a hindrance to traffic, so in the test construction mentioned above, when installing the gutter blocks, fine adjustments were made with dry mortar on the foundation. However, since the work involved lifting and lowering heavy groove blocks using a crane, there were drawbacks such as increased man-hours and a longer construction period. Further, the above-mentioned US patent has the disadvantage that since the base portion is formed of a single large block, it is difficult to align the top surface of the lid member that closes the upper side of the base portion with the surface of the road. This is due to the fact that it is difficult to adjust the upper surface of the common ditch to the slight vertical and cross-sectional slope of the road.

Means for Solving the Problems The present invention consists of arranging rectangular transverse blocks having hollow portions into which cables can be inserted at regular intervals in the transverse direction, aligning their upper surfaces with the vertical and cross-sectional slope of the road, and using them as a ruler. By performing foundation preparation work such as stone, gravel paving, rolling pressure, or concrete pouring, it is possible to reduce the man-hours and construction period for common ditch construction work such as laying ditch blocks. A passageway was provided that could be drawn out from the side and traversed to any side.

Function The covered type cable common groove according to the present invention has the function of serving as a ruler to eliminate the difference in level from the road surface and serving as a cable crossing path by arranging the hollow rectangular cross blocks at the time of foundation construction.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view, partially cut away, of a cover-hanging type cable common groove (hereinafter referred to as a cover-hanging common groove) provided with a crossing passage according to the present invention.
First, road B is excavated to form a common ditch on road B, and a covered common ditch A consisting of a ditch block 1 and a cover block 2 is laid in this excavated portion. In this case, the excavated surface is leveled, chestnut stone, gravel, sand, etc. are laid down and compacted, and concrete is poured if necessary.
In the present invention, the hollow rectangular transverse blocks 3 are first arranged at regular intervals, their upper surfaces are set to match the vertical and cross-sectional slope of the road B, and then the hollow rectangular cross blocks 3 are used as a ruler, and concrete is placed between them. Build base 5. The groove block 1 is arranged on the transverse block. Next, a partition plate 4 between the road B and the road B is attached to the upper part of the outer wall of the groove block 1, and earth and sand is poured into the outside of the groove block 1 and compacted and paved, with or without covering the cover block 2. That is, using the hollow rectangular transverse blocks 3 as a ruler, the base 5 is constructed between these transverse blocks. Further, when attaching the partition plate 4 to the groove block 1, the upper end of the partition plate 4 can be very finely adjusted to the road surface using the elongated holes 6 of the partition plate 4. In this way, the groove block is placed on the cross block set at the road height in advance, and the height of the partition plate can be adjusted, so that the covered common groove A can be laid on the same surface as the road B without any unevenness. . Note that the lid block covers the groove block to form a crossing path. In addition, in the hollow rectangular transverse block 3,
A hollow part 7 is provided in the side wall 8 of the groove block 1.
The cable conduit 10 pulled out from the outlet 9 of
can be inserted and traversed into the hollow part 7 and easily retracted to the side opposite the side wall 8. In addition, in this example,
Overhanging parts 12 are provided at both ends of the hollow square block 3, but this is because the width of the base 5 must be wider than the width of the groove block 1 in order for the base 5 to stably support the groove block 1. On the other hand, the pulled out cable conduit 10 must have the minimum required curvature,
Hollow rectangular transverse block 3 to be inserted into hollow part 7
The shorter the width, the better. Therefore, the hollow rectangular crossing block 3 is designed to satisfy the contradictory requirements of being long as a ruler of the base 5 and short as a crossing path. In addition, the cable suspension shelf mounting holes 11 in the groove block 1 are made of pressed brass screws similar to the mounting holes 13 of the partition plate 4, and are cast during molding, which is cheaper than installing inserts after installation. In addition, this is adopted as a means to further avoid a decrease in the yield strength of the groove block 1. Furthermore, for the drawer opening 9 of the side wall 8, a hard PVC pipe was made with a length of 2/3 of the thickness of the side wall 8, and the inner 1/3 was recessed, but this was done by punching out the drawer opening 9 and penetrating it. This is because it can be easily installed, and the embedded PVC pipe provides a good connection with the cable protection pipe.
These overhang portions 12, cast-in mounting holes 11,
13 and the structure of the drawer opening 9 are exemplified as preferred means, and are not necessarily limited to these methods.Furthermore, the surface of the lid block 2 may be provided with a colored uneven pattern to harmonize with the paved surface. Nor is it limited to this specification.

FIG. 2 shows a different embodiment of the end 14 of the groove block 1 in a perspective view. End 14
If it is shaped like a groove as shown in the figure, it is necessary to push it in to connect and lay the ends 14, but dry mortar or the like is spread on the concrete base 5 to take the level as in the conventional technology. When pushing, the end portion 14 collects dry mortar, and not only is it impossible to obtain the required level, but the dry mortar gets in the way and prevents connection. Therefore, as in the end portion 14 of FIG. 1, a lap joint is used, and the connection is made by lifting and lowering using a crane, which takes a lot of man-hours as described above. According to the present invention, the base 5 is constructed using the hollow rectangular transverse block 3 as a ruler, and fine adjustment with the road surface is made using the partition plate 4, so that it can be pushed in not only when the base 5 is made of concrete but also when it is on a gravel bed. Since the connection can be made, the construction can be easily carried out even if the structure of the end portion 14 is changed for reasons such as waterproofing.

FIG. 3 shows yet another embodiment in cross-sectional view. In this embodiment, groove block 1
The main difference is the cross-sectional shape of the accommodation cable 1.
This is applied to cases where the required curvature of 0' is large. That is,
As shown in FIG. 1, the cable conduit 10 may have a curvature that allows the cable to be pulled out from the outlet 9 of the side wall 8 of the groove block 1 and inserted into the hollow part 7 of the nearest hollow rectangular cross block 3, but the required curvature is is large, and the next or even next hollow rectangular transverse block 3
If it cannot be crossed otherwise, use groove block 1.
This is not desirable as it requires a large and wide excavation on the outside of the pipe to bury the pipe. Therefore, the cable 10', which requires a large curvature, is designed to be pulled out by opening the outlet 9 in the side wall 8 opposite to the side wall 8 on which it is suspended. Protective sheath 16 of cable 10', protective conduit 15, and its conduit and outlet 9
For the metal fittings such as the connecting fitting 17, conventional ones are used in conjunction with the hanging shelves and the like. In this case as well, the hollow rectangular crossing block 3 is used to cross the other cables 10''.

Further, FIGS. 4 and 5 show an application example of the present invention in a side view and a cross-sectional view. That is, as shown in FIG. 4, instead of the hollow rectangular transverse block 3,
Those in which a crossing path that also serves as the foundation 5 is provided by a downward U-shaped groove 21, an upward U-shaped groove 22, a groove formed by the boundary block 19, or a groove 18 constructed at the same time as the concrete pouring of the foundation 5, are It is based on the technical idea of the invention. In addition, as shown in FIG.
According to the present invention, a cable conduit 10 can be provided to carry supply pipes for water, gas, etc., and also to protect the cable conduit 10 that is taken out from the outlet 9 and crossed through the hollow part 7 of the rectangular cross block 3. Belongs to the technical scope.

Effects of the Invention The present invention replaces overhead cables, which have various problems, with a common ditch with a simple structure called a covered ditch block on the road, alleviates the problem of high construction costs, and connects them underground. In proceeding with the construction of the foundation, the problem of the lack of a crossing path was solved by using a hollow rectangular crossing block as the base, and the construction was also simplified by using it as a ruler when constructing the foundation. Furthermore, since the cable can be laid by sliding on the hollow rectangular transverse block and being pushed in, there is a high degree of freedom in the shape of the end of the groove block, the connection method, and the construction method, which is highly effective. Further, even when the required curvature of the accommodation cable is large, the present invention can be effectively applied by partially changing the cross-sectional shape of the groove block. Furthermore, since the groove block is placed on a plurality of transverse blocks whose heights are preset, there is an advantage that the upper surface of the lid block covering the groove block can be easily aligned with the surface of the road.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a covered cable common groove provided with a crossing passage according to the present invention, FIG. 2 is a perspective view of another embodiment according to the present invention, and FIG. FIG. 4 is a side view of an alternative example of a hollow rectangular cross block as an application example of the present invention, and FIG. 5 is a cross-sectional view of another example of the present invention, and FIG. FIG. 3 is a cross-sectional view of an embodiment of a road protection shelf. A...Common ditch, 1...Gutter block, 2...Lid block, B...Road.

Claims (1)

[Claims] 1. A plurality of cross blocks having cable insertion holes and arranged at intervals along the longitudinal direction of a common ditch to be formed in the road, and a plurality of concrete foundations constructed between the cross blocks;
It comprises a plurality of groove blocks disposed on the cross block, and a cover block disposed on the groove blocks and forming a cross passage of the common groove, and the height of the upper surface of the cross block is equal to the height of the cover block. 1. A covered type cable common ditch with a crossing path, the upper surface of which is set to match the surface of the road, and the concrete base is constructed between the crossing blocks using the crossing blocks as a ruler.