JPS6122452Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a trough for cables installed in a tunnel.

Cables installed in tunnels, especially OF cables, are installed in flame-retardant FRP troughs to prevent the fire from spreading into the tunnel in the unlikely event that a fire occurs due to a cable accident. Cables may be laid. However, in the past, flame-retardant materials were installed on the arms attached to the vertical supports inside the tunnel.
An FRP trough is placed and cables are laid inside this trough.

However, in such a system, the width of the trough is limited to the width that can be placed on one arm, so the space inside the trough is inevitably narrowed, and the cable is Snake shape (sinusoidal bending in the horizontal plane)
The width cannot be made large enough.

This disadvantage can be overcome by assembling a trough that surrounds several upper and lower arms and laying the cable on the arms within the trough, allowing the space between the upper and lower arms to be used for cable snake removal (vertical snake). Therefore, it is possible to provide the cable with a vertical snake of sufficient width (vertical width), which eliminates the problem.

In this case, it is necessary to use a split trough that can be assembled within the tunnel. However, in this case, the cable should be placed on the arms in the trough (the distance between the arms in the longitudinal direction within the tunnel is 1 to 2 m).
Therefore, it is extremely difficult to pull the cable into the trough after the trough is assembled, and it is difficult to place the cable on the arm from the outside of the trough during the trough assembly. It becomes necessary. Therefore, the trough division structure is
It is necessary to create a structure that does not interfere with the handling and construction of such cables, and simply dividing the trough will inevitably lead to a significant decrease in the workability of the entire cable installation work.

The trough for cables installed in a tunnel according to the present invention is
This configuration was devised in view of the above points, and the split-type trough body is made up of an upper piece, a lower piece, and both side pieces, and the upper piece, lower piece, and both side pieces are fitted together. The structure is characterized in that one side piece of the split type joint is supported on the outer surface by a bolt to a vertical support, and the arm is supported on the inner surface of the same side piece by the bolt. It is.

The present invention will be explained below with reference to the drawings.

Figure 1A is a partial longitudinal section (part A) side view of the trough for cables installed in a tunnel according to the present invention, and Figure 1B
1C shows a partial cross-sectional (part B) top view of the same trough as above, and FIG. 1C shows a cc cross-sectional view in FIG. 1A.

In FIGS. 1A to 1C, 1, . . . are vertical supports erected within the tunnel. T is prefabricated FRP
The trough is composed of a split-type trough body M and a split-type joint N for joining these trough bodies together. 2,... are the arms.

The above prefabricated trough T consists of FRP joint division pieces (upper piece B ₁ , lower piece B ₂ , and both side pieces A ₁ , A ₂ ) and FRP trough division pieces (lower piece C _{1 )} shown in Fig. 2. , lower piece C ₂ and both side pieces D,
It is assembled from D′).

The structure of the trough for cables installed in a tunnel shown in FIG. 1 will be explained while explaining an example of the assembly procedure of the above-mentioned assembly type trough.

First, one side piece A ₁ of the joint shown in Fig. 2
As shown in _FIG .
It is supported by a nut 4, and one end of the arm 2 is supported on the vertical support 1 by the bolt/nut 4.

Next, in FIG. 2, insert the trough side piece D into the joint side piece D at the ears d, d.
Fits into the groove _a2 of _A1 (the trough side piece D is composed of two parts, but these two parts can also be integrally molded), and then the arm 2
Cable W on top (already drawn into the tunnel)
(See Figure 1 C).

After mounting the cable W on the arm 2, place the trough upper piece C ₁ and the trough lower piece C ₂ at their respective ears d, and insert the groove a ₁ on the upper end side of the joint side piece A ₁ and the lower end side. fit into the grooves _A3 respectively.

After these are fitted, attach the two-pronged claw of the upper part of the joint _B1 to the two-pronged adapter _a4 at the upper end of the side piece _A1 of the joint.
b ₁ and the two-pronged claw b 2 of the lower joint _piece B ₂ is fitted into the two-pronged adapter a ₅ at the lower end of the side piece A ₁ of the above joint. In this case, the edge of the upper joint piece _B1 is overlapped with the end of the upper trough piece _C1 , and the edge of the lower joint piece _B2 is overlapped with the end of the lower trough piece _C2 .

After that, the trough other side side piece D' is arranged between the above trough upper piece _C1 and the trough lower piece _C2 (this trough other side side piece D' is the same as the above trough side side piece D'). It is the same as D, and as mentioned above, the upper and lower members can be integrally molded). In this case, there is no overlap between the trough upper piece C ₁ and the joint upper piece B ₁ and between the trough lower piece C ₂ and the joint lower piece B ₂ (the upper joint piece B ₁ and the lower joint piece B ₂ , this is because there is a notch 5).

After arranging the trough other side side piece D ₁ as described above, fit the upper end of the other side side piece A ₂ of the joint into the protrusion b ₁ ′ of the joint upper piece B ₁ at its notch _{a 1} ′. Then, insert the tongue piece b ₁ ″ of the upper joint piece B ₁ into its screw hole h.
At this point, fasten the fitting other side piece A ₂ to the screw hole h at the upper end with a screw, and on the other hand, connect the fitting other side side piece
Place the lower end of A ₂ at its notch a ₃ ′, and connect the lower joint piece B ₂
The tongue piece b ₂ ″ of the lower joint piece B ₂ fits into the convex part b ₂ ′ of the joint,
The screw hole h is connected to the screw hole h at the lower end of the joint other side piece _A2 with a screw. in this case,
Ear part d′ of trough upper piece C ₁ and other side pieces of trough
The ear part d'' of D' is in the groove _a11 of the upper end of the joint other side piece _A2 , and the ear part d'' of the trough other side side piece D',
d″ is the middle groove A ₁₂ of the joint other side side piece A ₂ , and the ear part d″ of the trough other side side piece D′ and the trough lower piece
The ears d of _C2 are fitted into the grooves _a13 at the lower end of the joint other side piece _A2 .

In the above, the ears of each piece of the trough are joined by a U-shaped jointer J via a packing P, as shown in FIG. In Figure 1A, J, J
...indicates a U-shaped jointer.

Packings are also attached to the fitting locations between the joint N assembled from the respective joint parts as described above and the trough body M assembled from the trough parts, but illustration of these packings is omitted.

The trough for cables installed in a tunnel according to the present invention is
The structure is as described above, and the trough body and the joint that joins the trough body are both divided into four parts vertically, left and right, and each of the divided pieces of the four-part type joint can be fitted into each other. Even with three pieces, it is possible to maintain the shape (U-shape) by fitting them together and support a trough with an open side, so one side of the trough can be left open along the entire length of the trough during assembly of the trough. The cable can be mounted on the arm in the trough during assembly from the outside side of the trough, and then the open portion can be closed with the other side pieces of the trough. Therefore, in a prefabricated trough in which arms are provided in the internal space, cables can be easily laid on the arms, and a sufficient vertical snake can be formed using the space between the upper and lower arms. It can be constructed with easy workability.

[Brief explanation of the drawing]

1A is a partially longitudinal side view showing a trough according to the present invention, FIG. 1B is a partially sectional top view according to the present invention, and FIG. 1C is a cc cross-sectional view in FIG. 1A;
FIG. 2 is a perspective view showing the member pieces used in the present invention, FIG. 3 is an explanatory view showing the supporting structure of the trough of the present invention, and FIG. 4 is an explanatory view showing the joining structure of the member pieces in the present invention. In the figure, M is the trough body, N is the joint,
A ₁ and A ₂ are the joint side pieces, B ₁ is the upper joint piece,
B ₂ is a joint lower piece, C ₁ is a trough upper piece, C ₂ is a trough lower piece, and D and D' are trough side side pieces.

Claims (1)

[Scope of utility model registration request] A split-type trough body consisting of an upper piece, a lower piece, and both side pieces are joined together by a split-type joint in which the upper piece, lower piece, and both side pieces fit into each other, and one of the split-type joints A trough for cables installed in a tunnel, characterized in that a side piece of the trough is supported on an outer surface by a vertical support with a bolt, and a arm is supported on an inner surface of the side piece by the bolt.