JPS5924615B2 - Cable laying trough with protective plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cable laying trough that is provided with a specific protection plate for protecting the inner bottom surface of the trough in a specific manner.

Generally, when laying a cable in a tunnel, a long trough is used to hold and store the cable.

The trough assembly process consists of joining the ends of the trough body, which has a trough-like shape with a limited length, to each other within the tunnel to form a continuous long trough-like structure. After installing the parts, place a gutter-like lid of a limited length and the same width as the main body, and repeat the process of closing by joining the side edges of both sides together.Finally, attach a belt or Finish by tightening the string etc.

In addition, in a typical cable installation trough, it is common to place a cable support member or the like at a distance on the bottom surface of the trough main body, and to attach the cable thereon.

In order to prevent the cable from coming into direct contact with the bottom surface of the trough body due to slack or bending of the cable between supporting members, a protection plate may be installed on the bottom surface of the trough body via a spacer. It has been adopted.

The present invention uses a long plate-like body having a plurality of longitudinal reinforcing legs integrally molded on one side as the protection plate, and installs the protection plate across the joint between the ends of the trough body. This is what I did.

By adopting such a protective plate, even if the material is reinforced plastic, it is possible to minimize the bending when the cable is placed on the top surface.

Additionally, by installing the cable across the joint of the trough body, extreme bending of the joint during cable installation can be avoided.

Furthermore, the reinforcing legs create a space between the protection plate and the bottom surface of the trough body, thereby protecting the trough body from being hit directly in the event of a cable short circuit.

The present invention will be described in more detail with reference to the accompanying drawings.

1 and 2 are for detailed explanation of the present invention, FIG. 1 is a partially cutaway perspective view, and FIG. 2 is an A-A in FIG. 1.
It is a cross-sectional explanatory view taken along a line.

The main body is made of reinforced plastic and has a gutter shape with a constant cross section, and an insertion groove 4 that opens upward is integrally molded on both side edges.

The end faces of main body 1 and another adjacent main body 1' are butted together, a separately prepared socket 7 is placed over the joint from the outside, and fixed with rivets or bolts, and this operation is repeated to form a continuous long gutter-shaped cable receiver. is formed within the sinus tract.

Then, a protection plate 3 formed integrally with a plurality of reinforcing legs 6 is installed across the joint between the main bodies 4 and 4'.

The protection plate 3 in the present invention is made of a long plate-like body, and a plurality of longitudinal reinforcing legs 6 are integrally formed on one side thereof.

The reinforcing legs 6 are usually formed continuously over the entire length of the long plate-like body in the longitudinal direction, but the reinforcing legs 6 may be partially discontinuous in the longitudinal direction.

Although an example of three reinforcing legs is shown in Fig. 1 and Fig. 2, it is sufficient to have two or more reinforcing legs, and the number of reinforcing legs is selected according to the width of the elongated plate-like body. Just do it.

Furthermore, the thickness of the reinforcing leg is not particularly limited, and is selected depending on the thickness of the protective plate.6Furthermore, the length of the reinforcing leg is related to the height of the protective plate 3 from the bottom of the trough body. It is also related to the storage capacity of the cable in the trough, so it is determined by taking these into consideration.

The width of the protective plate, that is, the length in the direction perpendicular to the longitudinal direction, is selected in accordance with the inner width between the two side edges of the trough body, so that it can be inserted between the inner width.

Normally, the width of the protective plate is selected to be approximately equal to or slightly shorter than the width of the inner width of the trough body.

Thus, the protection plate as described above is installed on the inner bottom surface of the trough body with its reinforcing legs facing down.

A rising portion may be formed on the peripheral edge of the protection plate.

As shown in FIGS. 1 and 2, the reinforcing legs are preferably L-shaped, square-shaped, or square-shaped in cross section in a direction perpendicular to the longitudinal direction.

Furthermore, it is also possible to adopt a structure in which the lower end of the reinforcing leg is integrally connected to the protection plate by a plate parallel to it.4 As described above, after the protection plate 3 is installed, cables and other necessary Install parts.

Similarly, if there are any necessary parts before installing the protection plate, it is of course possible to install or mount them in the trough body in advance.

For example, the socket 7 may be fixed in advance to one end of the trough body and connected to another end of the adjacent trough body within the tunnel.

The gutter-like lid 2 has a fitting portion 5 formed integrally with the lid by an amount corresponding to approximately the wall thickness of the lid at one end thereof, and is made of reinforced plastic.

As shown in FIG. 1, the lid is inserted from the extreme end of the trough body with both side edges facing the insertion grooves of the body.

As shown in FIG. 2, the inner diameter of the groove 4 of the main body is wide enough to allow insertion of the lid and the side edges of the fitting part, making the operation extremely easy.

Next, another lid 2' is attached to the body adjacent to lid 2 in a similar manner.

At this time, the end side of the adjacent lid 2' opposite to the fitting part 5' is overlapped with the fitting part 5 of the lid 2 to be installed first, and the side edge is inserted into the groove of the main body. do.

Since the fitting part 5 has a step corresponding to the thickness of the lid, the side edge of the lid 2' to be inserted next is inserted between the side edge of the fitting part 5 and the inner wall constituting the main body groove. A gap is secured for the next shot.

An advantage of such an embodiment is that the seams between the body and the lid do not necessarily have to coincide, as shown in FIG.

In other words, the grooves at the joints of the main bodies are fixed opposite each other, and the cross-sections are the same, so the side edges of the lid can be easily inserted into the main bodies by breaking the joints.

This point has a very important meaning.

In other words, the already known Utility Model Publication No. 45-22442
Compared to cases where the cable laying trough described in the above publication cannot be connected unless the joints between the lid and the main body match, the material requires cutting either the lid or the main body to match the joints. This eliminates wasted time and allows assembly without worrying about the joints of the main body, making it possible to significantly shorten the working time inside the tunnel.

Although FIG. 1 shows the case where the fitting portion of the lid is narrowed and molded, the assembly work proceeds in the same way if the fitting portion is widened by the thickness and a step is formed.

That is, in this case, the fitting portions of adjacent lids may be overlapped and bonded onto the end surfaces of the previously bonded lids that do not have the fitting portions.

Since the main body is a long structure of a complex constant cross section with grooves on both sides, it is advantageous to mold it by pultrusion.
It is also possible to press mold with a cross section that can be removed from the mold.

The lid can also be manufactured by integrally molding the fitting portion by press molding, or by adhering a previously prepared fitting member to the lid formed by a pultrusion method with adhesive or rivets.

The protective plate can also be formed by a pultrusion method. It is desirable that the resin constituting the material has flame retardancy.

Generally, methods for making unsaturated polyester resins used in reinforced plastics flame retardant include adding halogen molecules such as chlorine and bromine to the structure, or using secondary materials such as water-containing alumina powder, chlorinated paraffin, and antimony trioxide. Oxygen index values of 47 or higher have been achieved through mixing, and have been put into practical use for disaster prevention troughs.

After the work of attaching the lid is completed, the main body and the lid are tied together with a belt 8 or a string to prevent the lid from falling off in the unlikely event of the lid falling to the ground.

[Brief explanation of the drawing]

The accompanying drawings are for explaining the present invention in detail, and FIG. 1 is a partially cutaway perspective view, and FIG. 2 is a cross-sectional explanatory view taken along line A--A in FIG. 1. 1.1' is the trough body, 2, 2' are the gutter-like lids, 3 is the protective plate, 4, 4' are the insertion grooves of the main body, 5, 5' are the fitting parts of the lids, 6
7 and 7' indicate the reinforcing legs, and the sockets, respectively.

Claims (1)

[Scope of Claims] 1. A trough body having a trough shape, a trough-like lid having the same width facing the trough body, and a large number of structural units formed by joining the side edges of both sides in the longitudinal direction. In a cable laying trough formed by joining the ends of the unit, one end of the gutter-like lid is provided with a fitting part formed with a step approximately equal to the wall thickness, and the two edges of the trough body are An insertion groove is formed at the tip and has an opening width that allows insertion of both the side edges of the gutter-like lid and the side edges of the fitting part, and the fitting part is inserted into the fitting part of the adjacent gutter-like lid. It is a long plate-like body with a plurality of longitudinal reinforcing legs integrally molded on one side, and its width is between the opposite edges of the trough body. A cable laying trough equipped with a protection plate, characterized in that the insertable protection plate is installed at the bottom of the trough body with its reinforcing legs facing down, across the joints between the trough bodies. 2 The reinforcing leg is L in cross section in the direction perpendicular to its longitudinal direction.
The cable laying trough according to claim 1, which has a letter-shaped, square-shaped or square-shaped trough.