JPH0152968B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) This invention relates to a common trench for burying cables, and in particular, a common trench for cables that branches off from a main common trench and is buried under a sidewalk. The present invention relates to a common trench for burying cables having a mechanism for moving a desired cable in a very natural manner to a building located close to a building and in a desirable situation.

By burying various types of cables in a concentrated manner using communal trenches buried underground, we can prevent the chaotic digging up of roads, further strengthen the city's disaster prevention function, improve the aesthetic appearance of the city, and improve the road quality. It satisfies a wide range of conditions required by modern cities, such as promoting the effective use of space, ensuring safe and smooth traffic flow. In addition, underground cables are said to be a barometer of culture in cities in developed countries such as Europe and the United States, and are one of the desired urban structures for cities in the advanced information age.

(Conventional technology) In Japan, even in large cities such as Tokyo and Osaka, the prevalence of buried facilities using common trenches for various types of cables lags behind that of cities in Western countries, but it is rapidly increasing. In today's highly information-oriented society, cables are becoming more and more congested, and the demand for underground cables using common ditches is increasing from all quarters.

An example of conventional cable undergrounding using a common ditch is shown in Figure 9.
A plurality of arms 14, 14 extend from both side walls of the cable common groove 13, which is buried through a branch box placed at a predetermined position under the walkway 12 arranged along the side of the cable groove 13. Various cables 15, 16, 17, and 18 are supported on this arm 14.

(Problem to be Solved by the Invention) If it is necessary to wire a telephone cable to the building 19 located on the right side of the common ditch 13 in FIG. , 16 and 18 are different types of cables. Since the electric cable 17 is arranged in the building direction of the telephone cable 15, the telephone cable 15 once descends between each cable, and then the cables 17 and 18 It must be extended to the building side through the bottom. By taking such a process, the branch cable becomes congested, and there is even a danger of cable entanglement, especially the convergence of high-voltage and low-voltage wires. Furthermore, even if the telephone cable 15 is installed at the location of the electric cable 17, if the telephone cable 15 is extended horizontally toward the building, the depth of the telephone cable buried below the sidewalk surface will be too shallow. In some cases, drainage pipes for gas, water, rainwater, household water, etc. are installed under the sidewalk, and various cables must extend toward the building from a predetermined depth below the ground surface. There is. Therefore, when pulling the desired cable into the building, the code 18 in Figure 9 is used.
It is highly desirable to be able to extend a desired cable from the location through the branch box.

(Means for Solving the Problem) This invention has a group of band-shaped partition walls extending in the longitudinal direction within a cable common groove structure, and partitions the band-shaped chambers for accommodating several types of cables. Regarding the common trench for cable burial, which is formed by gently displacing the partition wall in the area and moving the band-shaped room containing the cables along the inner wall surface of the common trench structure, the band-shaped room containing various cables is specified. The cable is moved gently to the position within the bending tolerance of the cable, and the branch box is inserted in the common groove of the desired cable to allow for easy branching and drawing out. This will be explained using drawings.

(Example) A common cable groove 1 for accommodating several types of cables connected with branch boxes (not shown) interposed at predetermined positions is shown in cross-sectional views in FIGS. 1, 2, and 3. It has a rectangular shape with a lid, and a circular shape. Branching off from the trunk common trench buried under the roadway, the cable common trench 1', which is an embodiment of the present invention and buried under the sidewalk, has strips extending in the longitudinal direction for accommodating various types of cables 4. A plurality of strip-shaped rooms 3 are defined by two groups of partition walls.

This band-shaped partition wall 2 is separate from the common groove driver 1'.
The band-shaped partition wall 2 is integrally formed of an appropriately selected material such as concrete, synthetic resin, or metal, and is installed inside the common groove body 1' by means of insertion or fitting. Accordingly, a plurality of band-shaped chambers 3 are formed in the common groove body 1' along the inner wall surface of the common groove 1, and the outer end of each partition wall 2 is bolted, glued, or caulked to the inner wall surface of the common groove 1. We are using appropriate measures to prevent their movement.

By arranging the overall end face shape of the band-shaped partition wall 2 in a cross shape, four band-shaped chambers 3 are formed inside the common groove structure 1'.When each cable runs straight in parallel in the common groove, each partition wall maintains an intersection angle of 90°. However, when branching a particular cable and pulling it out toward a building, it is desirable that the cable be easily displaced to the most desirable position during the pulling operation, as described above with reference to FIG.

That is, as shown in FIG. 1, when the common groove carrier 1 is divided by a collection of partition walls assembled in a cross shape, four strip-shaped rooms A, B, C, and D are formed. If a telephone cable that is required to be pulled into a building located close to the right side of the ditch is located in the upper room A on the opposite side of the building, the depth from room A is too shallow below the ground surface, and there is a risk of cable breakage. It is desirable that it be pulled out from a room position that is flexible, preferably close to the building side, and that is sufficiently deep below the ground surface. According to the present invention, the band-shaped chambers A to D are moved along the inner wall surface of the common groove by gently displacing each partition wall 2 in the common groove within the permissible bending range of each cable, and as a result, each band-shaped chamber To move cables housed in a series of chambers within a common groove without difficulty, and to move the strip-shaped chamber to the most desirable position at a branch box part interposed in a series of common grooves.

The displacement of the bulkhead 2 for this purpose is realized in a region of the common groove near the end adjacent to the branch box for the extraction of the required extraction cable.

To give some concrete examples, as shown in FIG.
In the case of a rectangular cross section divided into two sections, when moving room A to room N, room B is made an empty room that does not accommodate the cable, and the partition wall 2a between room A and room B is moved to room R. The auxiliary wall 2e forming a pair in parallel with the partition wall 2a is then swung horizontally to the side, and then the room C is moved to the old room A position, the room N is moved to the old room C position, and the room A is moved to the old room D. The room is moved spirally along the inner wall of the common ditch. The above band-shaped room moving mechanism can be expanded to move six rooms as shown in FIG. 6, or nine rooms as shown in FIG. 7, as necessary.

Figure 2 shows an assembly of partition walls 2 made up of a common groove driver 1 with a circular cross section assembled in a cross shape, forming four strip-shaped rooms 3.
These partition walls 2 are gently bent spirally around the axis of the common groove body 1' to form a spiral twisted chamber 3 in the common groove.
The figure shows a central chamber 3 that accommodates high-voltage electric cables, etc. in the axial center of the common groove drive body 1' as a modification of Figure 2.
a, and five partition walls 2 extending radially from the same room 3a are gently bent spirally to form five spiral-shaped twisted rooms around the central room 3a. By changing the spacing between the radially extending partition walls, the volume of the band-shaped room can be changed. Incidentally, the above-mentioned spiral band-shaped chamber can be similarly formed in a common groove having a rectangular cross section.

(Effects) This invention accommodates various cables in each of a plurality of band-shaped chambers that partition a common channel structure, and when a specific cable is pulled out at a branch box part, a partition wall that partitions the band-shaped rooms is used. By displacing the strip-shaped room that accommodates each cable, and moving the strip-shaped room that accommodates the specific cable that you want to pull out at the branch box part to the optimal position for pulling out the cable, It ensures smooth movement, prevents each cable from becoming congested, and establishes a smooth and easy pulling operation for each cable, which also has the effect of helping to extend the life of the cables.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a common cable groove according to the present invention, FIGS. 2 and 3 are views corresponding to FIG. 1 showing other embodiments, and FIG. 4 is a cross-sectional view of a common cable groove shown in FIG. A perspective view showing the displacement state of the partition wall group in the groove,
5A to 5I are explanatory diagrams showing the movement status of the strip-shaped room in FIG. 4, and in particular, FIGS. E
6 and 7 are views corresponding to FIG. 5 showing other embodiments, and FIG. 8 is a view corresponding to FIG. 5 showing other embodiments. FIG. 9 is a cross-sectional view of a conventional cable common groove that accommodates various cables. In the figure, 1' is a cable common groove driver, 2 is a band-shaped partition, 3 is a band-shaped room, and 4 is a cable.

Claims (1)

[Scope of Claims] 1. A cable common groove structure is provided with a band-shaped partition wall group extending in the longitudinal direction to form a band-shaped room for accommodating several types of cables, and a partition wall is formed in one longitudinal region of the band-shaped partition wall. A common trench for burying cables, which is formed by gently displacing a belt-shaped chamber containing the cable and moving it along the inner wall surface of a common trench structure. 2. The common groove for burying a cable according to claim 1, wherein the band-shaped partition wall group is integrally formed and is formed separately from the common groove body.