JPH03261318A - Longitudinally snaking cable laying structure - Google Patents

Abstract

PURPOSE:To relax thermal shrinkage of cable by supporting respective top parts of a longitudinally snaking cable on respective receiving tables in a trough and floating the downwardly bent parts of the cable above the inner face of the trough. CONSTITUTION:A plurality of longitudinal rods 21 are planted in a culvert 11 and a bracket 22 for supporting a trough 31 is fixed to each longitudinal rod 21. Each trough unit 32 has a longitudinally snaked bent part and a length predetermined with reference to a pitch P. An L-type member 33 and a reverse L-type member 37 are abutted each other, end part of a lower panel 34 is jointed through a joint member 42 to the bent piece 40 of a front panel 39, and the end of an upper panel 38 is jointed through a joint member 43 to the bent piece 36 of a lower panel 35 thus constituting the trough unit 32. A cable 51 is then laid in each L-type joint member 33 and the downwardly bent part of the cable 51 is floated above the inner face of each L-type member 33.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a vertical snake-type cable installation structure with a disaster prevention function.

``Prior Art J'' There are two types of cable installation in tunnels: a horizontal snake type and a vertical snake type. By adopting these installation types, thermal contraction of the cable can be absorbed and alleviated.

In addition, the cable sheath is made flame retardant and the cable is housed in a trough to protect the cable from fire and external damage.

The cable installation type that has been widely used in the past has been the horizontal snake type, which makes it easy to lay cables, but recently there has been a trend to reduce the width of the tunnel from an economical perspective, so it is possible to make effective use of vertical space within the tunnel. The vertical snake shape that can be utilized is being reconsidered.

As a cable trough, a structure in which a rectangular tube structure is made using a plurality of panels and the rectangular tube structures are connected in the length direction is widely used.

In the case of such a trough, most of the cables that require it are of the horizontal snake type, and the trough itself is also constructed assuming a horizontal snake type, so it is rarely applied to vertical snake type cables.

``Problems to be Solved by the Invention'' Generally, in the case of important cables such as ultra-high voltage electric cables, sufficient disaster prevention measures must be taken, such as storing them in a trough.

However, regarding important cables laid with vertical snakes, disaster prevention measures for each line and prevention of fire spread against self-fires (
(closed structure), simplification of structure, space saving, etc., has not been provided.

In view of these technical problems, the present invention aims to provide a vertical snake-type cable installation structure that can satisfy the various demands mentioned above.

``Means for Solving the Problems 1 In order to achieve the intended purpose, the vertical snake type cable installation structure according to the present invention is such that a cable laid in a vertical snake type along the cable installation direction is The cable is covered with a trough having a meandering shape corresponding to the mold, and each top of the vertical snake attached to the cable is supported by each pedestal provided in the trough, and each top of the vertical snake is covered with a trough having a meandering shape corresponding to the mold. The cable is characterized in that the downwardly curved portion of the cable extending between the troughs floats above the inner surface of the trough.

In the case of the cable installation structure according to the present invention, the trough has a meandering shape corresponding to the vertical snake-shaped cable, so when the vertical snake-shaped cable is stored in the trough, the internal space of the trough (cable storage space ), the trough can be made smaller while increasing the density of cable mounting inside the trough, and the cables can be hermetically stored inside the trough.Furthermore, by stacking the troughs together, each cable can be separated by line. It can also be stored inside each trough.

Therefore, even in installation locations where space is limited, such as in tunnels, vertical snake-type cable installation can be carried out while making efficient use of the space.It also prevents damage to the cable and prevents the spread of cable fire. be able to.

Of course, in the case of the cable installation structure according to the present invention, each top of the vertical snake attached to the cable is supported by each pedestal in the trough, and the downwardly curved portion of the cable extending between the tops of the vertical snake is connected to the inner surface of the trough. Since it is more floating, it can smoothly absorb and alleviate the thermal contraction of the cable.

"Example" An example of the vertical snake type cable installation structure according to the present invention will be described with reference to the drawings.

In FIG. 1, a plurality of vertical bars 21 called vertical hardware are erected at equal intervals in a tunnel 11 from one side to the other. Trough 3 to be described later
A bracket 22 for supporting 1 is attached.

In addition to the brackets 22 and the trough 31, horizontal bars and shelf boards (not shown) are often assembled integrally with these vertical bars 21.

1 to 3, each trough unit 32, which is a unit structure of the trough 31, has a vertical snake-like curved shape, and the length of the trough unit 32 is the same as that of the vertical snake shown in FIG. The pitch is set to 1/2P to 2P based on the pitch P of .

The length of the trough unit 32 is determined by the IP
It is desirable that

As the material of the trough unit 32, a material having excellent heat resistance and mechanical properties is used, and for example, a heat resistant metal is used.

The trough unit 32, as shown in FIGS. 2 and 3,
The main components are a pair of L-shaped members 33 and an inverted-shaped member 37. The inverted type member 37 consists of a piece 36,
It consists of an upper panel 38 joined at right angles, a front panel 38, and a bent piece 40 provided at the lower end of the front panel 38.

Further, a metal pedestal 41 is attached to the inner surface of the top of the lower panel 34 for fixing the cable.

These L-shaped member 33 and reverse-shaped member 37 are as described below.
The ends of the lower panel 34 and the front panel 38 are butted against each other so as to have a rectangular cross section, and between the butted portions, the ends of the lower panel 34 and the front panel 38 are
The trough unit 32 is constructed by joining the bent pieces 40 of the top panel 38 and the bent pieces 36 of the rear panel 35 through the connecting members 42, and joining the ends of the upper panel 38 and the bent pieces 36 of the rear panel 35 through the connecting members 43. Furthermore, by relatively connecting a large number of trough units 32 in the longitudinal direction, it is possible to construct a trough 31 with a closed structure having a curved shape corresponding to the vertical snake of the cable.

In the embodiment of the present invention, when the cable (power cable) 51 is laid in a vertical snake shape as shown in FIGS. 1 to 3, the situation is as follows.

Regarding the trough 31 in the tunnel 11, a part of each trough unit 32 is first assembled.

At this time, each round member 3 is connected via the bracket 22.
3 to the vertical rods 21, and the L-shaped members 33 adjacent to each other are joined by connecting plates, flange joints,
The connection is made by known means such as bolting or welding, and the pedestal 41 located on the inner surface of the top of the lower panel 34 is also fixed to the vertical rod 21.

The cable 51 is drawn into the tunnel 11 via a working machine such as a hauling machine, and is once installed on the floor of the tunnel 11.

Next, the cable 51 is passed through a working machine such as a lift.
Place each part from one end to the other on each pedestal 41,
Each time the cable 51 is placed on the cradle 41, the cable 51 is fixed (lashed) to the pedestal 41 via the binding string 61.

In this way, when the cable 51 is laid in each connected shape member 33, the cable fixing point on each pedestal 41 becomes the top (mountain) of the vertical snake, and the distance between these cable fixing points is vertical. At the same time as forming the bottom (trough) of the snake, the other part of the cable 51 other than the cable fixing point, that is, the downwardly curved part of the cable 51 rises above the inner surface of each round member 33 .

In addition, as shown in FIGS. 2 and 3, there are 3
When placing and fixing the strip cable 51, first,
Cable 51 at position B, then cable 51 at position B,
After that, cable 51 at position C, etc.
, C are laid in this order.

Below, the L-shaped member 33 in the above-mentioned attached state and the corresponding inverted-shaped member 37 are butted against each other with l=1,
And between these butt parts, the lower panel 3
4 and the bent piece 40 of the front panel 38, and the end of the upper panel 38 and the bent piece 36 of the rear panel 35 are connected by connecting members 42 and 43, respectively, to form a trough unit with a rectangular cross section. 32 and further connect adjacent trough units 32 to form a required trough 31.

In this case as well, the L-shaped member 33, the inverted-shaped member 37, and the inverted-shaped members 37 adjacent to each other are connected by known or well-known means such as joining through the aforementioned connecting plate, flange joining, bolting, welding, etc. and connect.

In addition, when storing the vertical snake-type cables 51 in troughs for each line, it is sufficient to stack a plurality of troughs 31 in the vertical direction.

Effects of the Invention j As explained above, in the vertical snake type cable installation structure according to the present invention, the vertical snake type cable is covered with a trough having a meandering shape corresponding to the vertical snake type, and The top of the vertical snake of the cable is supported by a pedestal installed in the trough, and the downwardly curved part of the cable floats above the inner surface of the trough, which not only absorbs and alleviates heat shrinkage of the cable, but also saves space. Even if the cable installation space is limited, it is possible to effectively utilize this space for vertical snake-type cable installation and provide sufficient cable protection.

[Brief explanation of drawings]

Fig. 1 is a front view schematically showing an embodiment of a vertical snake type cable installation structure according to the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a cross-sectional view taken along the line m-m in Fig. 1. FIG. 11...Cunnel 21...Vertical rod 22...Bracket 31...Trough 32...Trough unit 33... L-shaped member 34... Lower panel 35... Rear panel 3B... Bent piece 37... Reverse-shaped member 38... Upper part Panel 39...Front panel 40...Folding piece 41...Base 42...Connection member 43...Connection member 51. ... Cable 61 ... Binding string

Claims (1)

[Claims] A cable laid in a vertical snake shape along the cable installation direction is covered with a trough having a meandering shape corresponding to the vertical snake shape of the cable, and each top of the vertical snake attached to the cable is A vertical snake-type cable installation structure characterized in that a downwardly curved portion of the cable extending between the tops of the vertical snake is supported by each pedestal provided in the trough and floats above the inner surface of the trough.