JPH08326043A - Electric-wire underground multi-purpose duct and buried duct constructing underground multi-purpose duct thereof - Google Patents

Abstract

PURPOSE: To reduce construction cost, and to construct this underground multi-purpose duct freely in conformity with wiring path length by combining a buried duct having closed structure, in which a partition is formed, a buried duct, in which an outlet is formed to a side face, and a buried duct having branching inlet structure connecting and branching both buried ducts. CONSTITUTION: The inside of a square-shaped steel pipe, etc., is divided in a latticed shape, and a plurality of paths, through which electric wires, etc., are passed, are formed, thus constituting a closed duct 3. On the other hand, a working window is bored to the top face of the square-shaped steel pipe, etc., an outlet 11 is formed to a side face, and a communication wire, etc., are drawn out, thus configuring an open duct 4. A blank cap made of a rubber is fitted to the outlet 11, thus easily mounting and demounting wirings. Branching inlets 2, 7 are formed in a hollow columnar body made of a steel plate. The working window is bored to the top face, and a plurality of the connecting sections of the closed duct 3 and the open duct 4 are set up to the side face. When the closed duct and the open duct are not connected, a blind patch is installed through a sealing material. The closed duct 3, the open duct 4 and the branching inlets 2, 7 are combined to constitute an electric-wire underground multi-purpose duct 1, thus allowing construction in required length in conformity with wiring path length on a field. High aseismicity is obtained because the duct 1 is made of the steel pipe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire joint groove for underground wiring of a telephone line, a transmission line and a communication line for other electric equipment, a buried groove for constructing the electric wire joint groove, and a laying work. The present invention relates to an improvement made in a buried groove for improving efficiency.

[0002]

2. Description of the Related Art In response to the voice of "multimedia" that has been advocated in recent years, so-called underground wiring, in which communication lines and the like are collectively passed through an electric wire common groove, is increasing. Although such underground wiring is more expensive than conventional aerial wiring, the utility poles essential for aerial wiring impair the cityscape,
There are no problems such as obstruction of traffic and obstruction of fire fighting activities, and there is no danger of causing secondary disasters due to disconnection of airborne wires due to earthquakes or typhoons. It is becoming accepted.

The basic electric wire common groove is constructed by connecting buried grooves of various shapes and lengths. This buried groove can be divided into large-scale, medium-scale, and small-scale buried grooves according to the depth and specifications. Among these, small-scale buried trenches are often made of concrete, which can be constructed relatively inexpensively, because the demand for them is larger than others. Examples of this include Japanese Examined Patent Publication No. 6-7726. This concrete-made buried groove is generally a form in which a concrete side groove that is currently seen is covered, and various shapes are used according to the wiring route.

[0004]

As described above, the small-scale buried groove is required to have various shapes, the quantity is in great demand, and the price is low. But,
On the other hand, a certain strength is also required from the usage form of "buried", and it has a structure or strength that can prevent or mitigate damage particularly during earthquakes (suppress the damage to the extent that it does not cut the cables that are inserted). Is desired. However, the conventional concrete buried trench is vulnerable to earthquakes, and the collapse of the buried trench itself unavoidably damages the cables. For this reason, it has been proposed to use an embedding groove made of a metal pipe instead of the embedding groove made of concrete. As an example of this, Japanese Patent Application Laid-Open No. 2-6502
No. 5 etc. can be mentioned.

Since the buried groove made of a metal pipe is usually more expensive than that made of concrete, it is preferable to mass-produce the same type of structure and reduce the manufacturing unit price. In addition, the joint structure between the buried grooves is required to have high sealability, but if there are many types of buried grooves, the joint structure becomes complicated and not only the manufacturing unit price increases, but also the installation work becomes difficult. There is. Therefore, it was decided to study so that the wire joint groove connecting the metal-embedded grooves can be constructed as cheaply and easily as possible and with a free configuration according to the wiring route.

By the way, such a metal-embedded groove has a structure in which a plurality of round steel pipes are respectively penetrated through a plate material to be bundled, and a groove in which a rectangular steel pipe having a large cross-sectional area is partitioned. Any of the buried grooves, when connecting the buried groove,
The end faces of the respective buried grooves to be connected are bolted together while being in close contact with each other via a seal such as a rubber packing. In addition, the wiring route of the underground wiring is not necessarily an integral multiple of the buried groove, and it is necessary to bend the wiring route as necessary.
In the former case, an embedded groove whose length is adjusted according to the extra or insufficient length (hereinafter referred to as a fractional length) is manufactured, and in the latter case, an embedded groove bent or curved according to the wiring route is manufactured. Was common.

When burying a structure underground, a space of 600 mm is required from the top surface of the structure to the ground, and when the depth of excavation during laying work exceeds 1 m, the partition wall is kept so that it does not collapse. There are many restrictions on the work for laying the buried trench, such as the need to install For this reason, the conventional laying work of the buried groove is expensive, and this has been a factor to prevent its widespread use.

In addition, it is not possible to adjust the total length according to the wiring route or to manufacture a curved or curved buried groove separately.
When pushing up the unit price of the buried groove or connecting the special buried groove and the general-purpose buried groove, it is difficult to perform a leveling work or the like for laying each other. Therefore, for the purpose of improving the laying work of the buried groove, it is possible to reduce the installation cost of the electric wire common groove constructed by the metal buried groove,
We also decided to consider the structure and type of the buried trench.

[0009]

[Means for Solving the Problems] As a result of the examination, the developed one is an electric wire joint groove constructed by connecting embedded grooves made of metal pipes, which has a closed structure with a partition inside (hereinafter referred to as a closed groove). (Abbreviated as a groove), an open structure embedded groove having an access door on one surface (hereinafter abbreviated as an open groove), and a branching bridge structure provided with a connecting portion with a plurality of closed structure or open structure embedded grooves. This is an electric wire joint groove constructed from a buried groove (hereinafter, abbreviated as a branch).

The closed groove comprises a rectangular steel tube or a hollow groove in which a steel plate is covered with a steel plate having a substantially U-shaped cross section, and a partition is provided inside to divide the cross section of the steel pipe or hollow groove into a grid shape to form a plurality of electric wires. The structure that secures the route to pass through. The partition is to divide a route by vertically or horizontally installing a rectangular steel pipe or a hollow groove, for example, to secure a route in which the upper stage is divided into 3 sections in the lateral direction and the lower stage is divided into 5 sections. It is also possible to secure unequal routes of different sizes. The partition may be simply inserted into the steel pipe or the hollow groove, but it is preferable to form an end face that is in close contact with the inner side face and plug-weld this end face.

The open groove comprises a rectangular steel tube or a hollow groove in which a U-shaped steel plate having a substantially U-shaped cross section is closed with a steel plate. A work window is opened on the upper surface and a drawing hole for drawing out a communication wire or the like is provided on the side surface. . It is preferable that the work window has a lid frame on the periphery thereof and has a structure in which a sealing material is interposed and an access panel is fitted therein. The access panel can be pasted with a Braille block,
It is preferable to attach a sensor for detecting opening / closing and a lock mechanism for controlling opening / closing. The draw-out hole is fitted with a rubber blind cap that is easy to attach and detach, and is blinded when it is not necessary to draw out the communication line.

The branch rod is a hollow columnar body formed of a steel plate, and has a work window opened on the upper surface thereof, and a plurality of connecting portions with closed grooves or open grooves are provided on the same or different layers on the side surface of the columnar body.
Alternatively, a structure is provided in which an extraction hole for extracting a communication line or the like is provided. The work window and the extraction hole are the same as those of the open groove. The connecting part is
It is preferable that the closed groove or the open groove is connected by interposing a sealing material, and when these embedded grooves are not connected, the blind plate is attached by interposing the sealing material, and the blind hole is provided in this blind plate.

Although each of the buried grooves basically has a fixed length, it is possible to prepare a buried groove whose entire length is expandable and contractible. The connection between these buried grooves is provided in a frame body having an inner diameter larger than the outer diameter of the buried groove, a joint structure in which the buried grooves to be connected are abutted in the frame body, or an outer frame body (or an inner frame body). A joint structure in which an oscillating shaft is pivotally attached to an inner frame (or an outer frame), the outer frame and the inner frame are connected to respective embedded grooves to be connected, and oscillating properties are added to the embedded grooves. Connect by. In the former case, the seal material is interposed between the inner surface of the frame and the outer surface of the buried groove, and in the latter case, the seal material is interposed between the outer frame body and the inner frame body. Each frame body may be formed as an integral piece or may be divided.

The electric wire common groove of the present invention can be basically constructed by three kinds of closed groove, open groove and branching groove, and the closing groove or open groove is a connecting portion of the same level on the side surface of the branching groove, or It is possible to construct a free wiring path that is bent in the horizontal direction or the vertical direction by connecting to the connecting portions of different layers. Further, since the electric wire common groove is made of a steel plate or a steel pipe, it is possible to secure sufficient strength to protect the communication wire and the like inserted in each buried groove from earth pressure and earthquake.

The closed groove is the basic element for constructing the electric wire common groove, and by providing a partition for dividing the inside into a grid pattern,
Various communication lines and the like that are mixed can be sorted by type and inserted. The partition can be appropriately selected according to the electric wire common groove to be installed, and by fixing it in the buried groove by plug welding, it will not shift due to external vibration, etc. The strength can be secured.

The open groove enables the work of drawing out the communication line or the like from the work hole from the work window, and enables the maintenance and repair work of the other communication line or the like. The extraction hole draws out a necessary communication line or the like from the buried groove and enables wiring to the end. The unused holes are fitted with rubber blanket caps to ensure the sealability of the open groove. The work window can avoid the risk of accidental opening by fitting the access panel into the lid frame and closing the lid.
A lock mechanism prevents unauthorized opening and closing, and if the access panel is opened, a sensor will alert you to alert your surroundings.
You can also notify the person in charge of maintenance.

The line of Braille blocks on the sidewalk is generally provided in the most convenient and safe place,
The electric wire common groove of the present invention is assumed to be installed along the line of the Braille block. Therefore, by attaching a braille block to the surface of the access panel that looks into the ground surface, the existing braille block line is not broken.

The branch basin changes the direction of a horizontal or vertical wiring path as a wire common groove by connecting a closed groove or an open groove to a plurality of connecting portions provided in the same layer or different layers, respectively. When three or more closed grooves or open grooves are connected, underground wiring can be concentrated or branched. The buried grooves are connected by interposing a sealing material to ensure the sealability as the electric wire common groove. In addition, the unused connection portion is provided with a sealing material by attaching a blind plate so as to secure the sealing property, and by providing a drawing hole in the blind plate, a communication line or the like can be drawn out.

The joint structure separate from the buried groove simplifies the structure of the buried groove and reduces the manufacturing labor. In the joint structure of the frame body, the sealing property of the electric wire common groove can be secured only by interposing the sealing material between the embedded groove and the frame body or between the outer frame body and the inner frame body. In particular, the joint structure with added swinging property causes the buried grooves to swing relative to each other in response to a load stress during an earthquake, thereby avoiding damage to the wire joint groove.

In order to improve the efficiency of the work for laying the electric wire common groove described above, two or more hollow grooves are fitted to each other,
The seal provided on the outer surface of the hollow groove for insertion is brought into sliding contact with the inner surface of the hollow groove for extra insertion, or the seal provided on the inner surface of the hollow groove for extra insertion is brought into sliding contact with the outer surface of the hollow groove for insertion. It is advisable to use a buried groove that allows expansion and contraction. Hereinafter, in the present invention, this buried groove will be referred to as an "expandable buried groove", and the closed groove and the open groove having the fixed length will be collectively referred to as a "fixed buried groove". The expansion / contraction embedded groove has an open structure by providing an access door for inspection etc. in the hollow groove which is a component, and generally has a closed structure.

The basic structure of this expansion and burying groove is as follows:
Insert a small rectangular hollow groove (hereinafter referred to as an interpolated hollow groove) from both ends into one rectangular hollow groove (hereinafter referred to as an extrapolated hollow groove) so that they are engaged with each other. ,
For example, it is advisable to apply a sealing material to all four surfaces of the inner surface near the end surface of the outer insertion hollow groove and the outer surface near the end surface of the insertion hollow groove on the insertion side. Further, in addition to the sealing material, it is preferable to provide a stopper in such a positional relationship that it engages earlier than the sealing material when the insertion hollow groove is moved forward and backward with respect to the insertion hollow groove. Note that, contrary to the above, a structure may be adopted in which the outer insertion hollow groove is fitted from both ends of the inner insertion hollow groove.

Since the expansion hollow groove moves forward and backward with respect to the outer insertion hollow groove while maintaining the airtightness by the seal, the total length can be adjusted while maintaining the airtightness as the hollow groove. In the field, it is possible to easily create a buried groove adjusted to the fractional length of the wiring path being laid. Moreover, if the total length is adjusted so that the hollow hollow groove can be moved back and forth, even if a load is applied to the entire wire joint groove due to an earthquake, for example, this telescopic buried groove will absorb the load while expanding and contracting. It is possible to avoid damage as the electric wire joint groove.

Then, in all the buried grooves, it is preferable to provide a groove hooking portion for supporting the edge of the buried groove to be connected to the upper edge or the lower edge of the end surface of the hollow groove. In addition to those that form a wiring path by connecting them in series, the buried groove has a branching structure in which a plurality of buried grooves are connected to a connecting portion to concentrate or distribute the wiring path (hereinafter abbreviated as branching groove). ), The groove hooking portion may be provided at the lower edge of the connecting portion of the branch rod. The groove hooking portion may have a structure in which the lower edge of the end surface of the hollow groove or the lower edge of the connecting portion is bent, or a structure in which a plate member is separately attached.

This groove hooking portion hooks and supports on the edge portion of the embedding groove of the other party to be connected, thereby determining the connection positional relationship while leveling and facilitating the laying work. Also,
After connecting the buried grooves, the groove locking part receives the load of earth and sand applied to the buried grooves, and alleviates the shear load applied to the bolts that connect the buried grooves to each other, improving the strength of the wire joint groove. You can Further, the buried groove has a horizontal surface with respect to the buried groove that is normally laid horizontally, and this horizontal surface serves as a resistance to prevent the buried groove from sinking due to its own weight or due to downward load. It prevents the intrusion of earth and sand or gravel into the connecting part, especially the sealing material, and contributes to the extension of the life of the electric wire common groove.

Further, if both end surfaces of the hollow groove form a predetermined angle, if there is a buried groove for bending or bending a wiring path formed when another buried groove is connected to each end surface, the laying work is facilitated. Becomes Hereinafter, in the present invention, this embedded groove will be referred to as a “unit embedded groove” from the meaning of a unit element that bends the electric wire common groove. The unit embedding groove may be inclined at one or both end surfaces of the linear hollow groove to form a predetermined angle,
One or both end surfaces of the bent or curved hollow groove may be orthogonal to the path direction of the hollow groove to form a predetermined angle, but if the hollow groove is straight, it is the same as the abutting of the buried grooves. Since it is necessary to take care so that the communication line etc. is not damaged at the connection part between the unit buried groove and the normal buried groove,
Bending or bending the hollow groove itself that constitutes the unit-embedded groove,
It is preferable to provide a hanger for supporting a communication line or the like inside the unit buried groove. The predetermined angle is preferably about 10 degrees. For example, by connecting three unit-embedded grooves whose both end surfaces form 10 degrees, it is possible to construct a wire joint groove in which the wiring path is bent by 30 degrees, and the predetermined angle is different. By combining the unit-embedded grooves, it is possible to construct a wire joint groove in which the wiring path is bent or curved at various angles.

The unit embedding groove may have substantially the same length as the linear embedding groove, but if the entire length is made extremely short, the wiring path can be bent or curved with a small radius of curvature, and above all, it can be handled. Will be easier. The bending or bending angle required for the wiring route can be realized by combining a plurality of unit embedding grooves. As described above, if the unit embedding groove of extreme length is used, the wiring route can be achieved by actually combining the unit embedding grooves at the laying site. You can build a joint groove for bent electric wires,
Laying work becomes easier. By connecting a plurality of unit buried grooves whose hollow grooves are straight and whose both end faces form an angle of 0 degrees, it is possible to fill a fractional length wiring path instead of the expansion buried groove, and conversely The fractional length formed by connecting the grooves may be adjusted with the expansion / contraction embedded groove.

As described above, the electric wire common groove of the present invention and the buried groove for constructing the same are intended to promote the installation of underground wiring, which has been recently demanded, in particular, an optical fiber communication network provided for high speed and mass communication such as the Internet. In addition to providing a basic form of underground wiring, the construction of the electric wire common groove can be constructed inexpensively and easily. Then, considering the strength of the joint groove of the electric wire after the installation, especially the earthquake resistance, it enables the permanent use of the optical fiber network that becomes a social and public infrastructure structure.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. FIG. 1 is a perspective view showing a construction state of the electric wire common groove 1 of the present invention. In this example, the branch rod 2 having the connecting portion 5 in eight directions is placed at the left end, and the closed groove 3 and the open groove 4 are provided in the right direction.
In order to bypass the road and the water and sewerage (see the chain double-dashed line in Fig. 1), the branch rods 7 and 7 having two-tiered connecting portions 5 and 6 are formed on the octagonal column extending in the vertical direction. It has an appearance in which it is arranged on both sides of the water and sewage system, and the lower connecting portions 6, 6 are connected by the closed groove 3.

On the upper surfaces of the branch rods 2 and 7 and the open groove 4, there is a work window 1
9 (see FIG. 5 and FIG. 10) is provided with a drawing hole 11 directly on the side blind plate 10 or on the side surface to draw out the communication line 12 and the like. In FIG. 1, the buried grooves are arranged in a straight line from left to right, but by changing the connection direction of the closed groove 3 or the open groove 4 to the branch rods 2 and 7, any horizontal direction can be obtained. It is possible to build a wiring route facing the. Further, in the branch basin 7 having the connecting portions 5 and 6 in a hierarchical manner, the wiring path can be provided in multiple layers by connecting the closed groove 3 or the open groove 4 to be connected to the connecting portions 5 and 6 of each layer, The degree of freedom of the wiring route in the vertical direction is secured.

FIG. 2 is a partially cutaway perspective view of the closed groove 3 used in this example. The closed groove 3 is manufactured from a rectangular steel tube and, as seen in FIG. 2, is provided with connecting flanges 13 at both ends to form an insertion end 14. The connection of the embedded grooves is a predetermined joint structure so that the insertion ends of the embedded grooves are butted (see FIGS. 8 and 9).
And each flange 13 is bolted to the joint structure. The partition 15 is fixed to the inner side surface of the closed groove 3 by plug welding so that the communication line and the like can be sorted according to type and inserted. The cross-sectional shape of this partition may be determined as necessary. For example, as shown in FIG. 3 (partition example 1) and FIG. 4 (partition example 2), partitions 16 and 17 can be divided into large and small partitions. .

FIG. 5 is a partially cutaway perspective view of the open groove 4 used in this embodiment, FIG. 6 is a partially cutaway perspective view of the access panel 8, and FIG. 7 is a hanger 18 provided inside the open groove 4. It is an expansion perspective view. The open groove 4 is manufactured from a rectangular steel pipe and has a structure similar to that of the closed groove 3 as shown in FIG. 5, but the work is performed by pulling out the communication wire or the like from the draw-out hole, maintenance, and inspection work. A work window 19 is opened on the upper surface, leaving a peripheral edge that can withstand pressure, and a partition that interferes with inspection and maintenance work is provided by inserting the access panel 8 into the lid frame 20 provided around the opening and closing the lid. No, hanger 18 that can be freely attached to and detached from the inside instead
And a point that a side surface is provided with a drawing hole 11 for drawing out a communication line and the like and is normally covered with a rubber blind cap 21.

As shown in FIG. 6, the access panel 8 has a braille block 22 adhered to the upper surface thereof, which is usually a lid frame.
The work window 19 is closed by fitting it into the lock 20 and locked by a lock mechanism or the like. A sensor 23 that comes into pressure contact with the lid frame 20 is provided on the side surface of the access panel 8 so that the access panel 8 can be mischievous.
When the sensor 23 cannot detect the contact of the lid frame 20 by removing it, an alarm is sounded to the outside. The electric wire common groove 1 (see FIG. 1) of the present invention is easy to install and maintain,
It is supposed to be installed along the line of Braille panels on the sidewalk. The Braille block of the access panel 8 is for consideration so as not to break the line of the existing Braille block, and the lock mechanism, the sensor 23, etc. of the access panel 8 are for preventing the danger of opening the work window. .

The open groove 4 cannot be provided with a partition for obstructing the work because it is a work for pulling out the communication wire or the like to be inserted from the pull-out hole. However, if the communication line or the like is not supported over the entire open groove 4, the communication line or the like may bend due to its own weight, which may cause a problem such as disconnection in some cases. Therefore, by providing the hanger 18 as shown in FIG. 7 inside, the communication line and the like are intermittently supported. This hanger 18 has an end surface 2 that abuts the inner surface.
By cutting 4,24 diagonally so that they are substantially parallel to each other, and rotating horizontally with respect to the hooking pieces 25, 25 attached to the inner surface (see the lower hanger in FIG. 7), Can be easily attached and detached.

Unlike the closed groove 3, the open groove 4 can open the work window 19 to handle a communication wire or the like from the outside, and by pulling out the communication wire or the like from the drawing hole 11 provided on the side surface. The wiring from the wire joint groove 1 (see FIG. 1) to the end is made possible. In order to secure the sealing property when not used, the pull-out hole 11 is usually fitted with a rubber blind cap 21. From the drawing-out hole 11, one to several communication lines or the like are drawn out. The closed groove 3 and the open groove 4 described above may be pipes formed by combining four steel plates, or may have a structure in which a steel plate having a substantially U-shaped cross section is closed with a steel plate.

The closed or open groove, as seen in FIG.
With a sealing material 28 interposed, a joint structure 27 for sandwiching the sealing material 28 by bolting 29 the mutual flanges 13 and 13 together,
Can be directly connected. In this joint structure 27, a seal material 28 is fitted into the butted insertion ends 14, 14 and the buried groove is connected by a bolt connection 29. Since the sealing material 28 is generally made of rubber or the like, it has elasticity, and the wiring path can be bent to some extent depending on the tightness of the left and right bolt connections 29. Even in this case, since the sealing material 28 is fitted into the insertion end 14, it is possible to maintain a high sealing property without departing. As described above, this joint structure has a feature that, while being simple, sufficient sealing performance can be secured. Seal material 28
The outer periphery may be covered with a steel plate or the like as necessary.

Further, a joint structure 30 having an oscillating property as shown in FIG. 9 may be used. The joint structure 30 is composed of an inner frame body 32 and an outer frame body 33 that are connected to each other via swing shafts 31 and 31. For example, the entire electric wire common groove 1 (see FIG. 1) is protected against shaking of an earthquake. Since it can be swung following the shaking, uneven concentration of load can be avoided as much as possible, and even if damage is caused, it can be done by only damaging the rocking shaft 31, so it is possible to protect communication lines and the like. (fail safe).

A joint structure 3 provided with the swing shafts 31, 31
0 does not rely on the branch basin, bends the connection angle of each buried groove,
The wiring path can be gradually bent. Note that FIG.
The joint structure 30 in FIG. 2 is composed of an outer frame body 33 divided into a support frame 34 having a substantially U-shaped cross section and a closing plate 35, and an inner frame body 32 having an integral structure. The inner frame 32 can be fitted from above and the lid can be closed with the closing plate 35, and a simple connection of the buried groove can be realized. The sealing material 36 is the inner frame 32.
And the outer frame body 33.

FIG. 10 is a perspective view of the branch rod 2 used in this example, and FIG. 11 is an enlarged sectional view of the connecting portion 5 showing a state in which the closed grooves 3 are connected. The branch basin 2 is composed of a total of 10 steel plates constituting the upper surface, the lower surface and each side surface, and work windows 19 similar to open grooves are formed on the upper surface at each side surface facing in eight directions at equal intervals. It has a connecting part 5. The branch rod 2 can bend the direction of the wiring path by connecting the closed groove 2 or the open groove 3 to the connecting portion 5. Further, in the branch rod 7 (see FIG. 1) in which the connecting portions 5 and 6 are provided in multiple layers, horizontal wiring paths can be laminated in a hierarchical manner. Note that, for example, as shown in FIG. 12, a branch rod 37 having a shape having a connecting portion 5 in five directions is also conceivable. In this way, the shape of the branch rod and the number of branches can be set arbitrarily.

In the connecting portion 5 which does not connect the closed groove or the open groove,
The sealing material 38 is interposed and the blind plate 10 is bolted to ensure the sealing property. This blind plate 10 is provided with a drawing hole 11 for drawing out a communication line and the like, and usually a rubber blind cap 21 is fitted to secure the sealing property, but if the blind cap 21 is removed as necessary, the A communication line or the like for wiring to can be drawn out. The connecting portion 5 is a blind plate
Receiving part for inserting the blind plate 10 so that 10 can be easily attached.
39 is provided on the lower edge.

The connection of the closed groove 3 or the open groove to the connecting portion 5 is shown in FIG.
As can be seen from 11, the insertion end 14 of the closed groove or the open groove is inserted into the connecting portion 5, and the flange 13 is bolted to the side surface of the peripheral edge of the connecting portion with the seal member 38 interposed. In addition to the above, the connection of the closed groove 3 or the open groove 4 to the connecting portion 5 is
It may be performed via the joint structures 27 and 30 described above. In this way, by constructing the connection structure of the same specifications for the end faces of each buried groove, it is possible to make the construction of the wire joint groove 1 (see Fig. 1) more flexible and reduce the installation cost of the wire joint groove. To do.

In the connection of each buried groove, usually, the stepwise predetermined lengths are determined in advance and the manufacturing is performed. Therefore, in constructing the electric wire common groove, excess or deficiency of the buried groove with respect to the wiring route occurs. There is. In this case, the joint structures 27 and 30 shown in FIG. 8 or FIG. 9 can be connected in series to compensate for the shortage of wiring paths generated between the buried grooves, but the excess or shortage of the wiring paths can be directly adjusted. If there is a buried groove that can be formed, it is convenient for installation work of the electric wire common groove.

The electric wire common groove of the present invention can be practically constructed with a degree of freedom in the vertical and horizontal directions by using a branch box having a multi-layered connecting portion. In this case, the position of the branch rod functioning as the hub (HUB) of the wiring route is approximately determined, and the entire wiring route is constructed accordingly. Therefore, the total length of the wiring route cannot be dealt with by adding each of the ready-made buried grooves, but the stretchable buried groove easily absorbs the excess or deficiency of such a wiring route, and the wiring route in the same horizontal plane Try to make the connection as short as possible.

FIG. 13 is a perspective view of the retractable closed groove 40. The closed groove 40 is formed by sealing members 42, 43 from both ends of the intermediate portion 41 having an elongated appearance of the joint structure 27 shown in FIG.
The guide bar 45 provided on the outer side surface is inserted by inserting the adjusting portion 44 having a short appearance of the closed groove 3 shown in FIG.
It is a structure in which the adjusting portion 44 can be freely moved back and forth along. Adjustment unit
44 may be either left or right. In addition, a partition 46 may be provided in the adjustment unit 44 to support a communication line or the like.

FIG. 14 is a perspective view showing a state in which the electric wire joint groove is constructed from the branch rod 47, the expansion embedding groove 48, the fixed embedding groove 49, and the unit embedding groove 50 using the structure of the present invention. The buried grooves 47, 48, 49, 50 are connected by bolts, but bolts are omitted in the figure. In the example shown in FIG. 14, the branch rod 47 is used as a hub (HUB) for the wiring path, and the expansion / contraction or fixed buried grooves 48 and 49 are extended from the branch rod 47 in three directions so that a free wiring path can be constructed. .

As shown in FIG. 14, the branch basin 47 has the appearance of an octagonal prism, and the connecting portions 51 are arranged in two rows of upper and lower sides,
Normally, a blind plate 52 is attached to each of them to seal them. A groove hooking portion 53 is provided on the lower edge of each connecting portion 51,
The stretchable or fixed embedded grooves 48, 49 are formed by removing the blind plate 52 and applying the lower edge of the flange 54 to the groove engaging portion 53 while the flange 54
Is brought into close contact with the connecting portion 7 through a seal and bolted. In this branch basin 47, to connect and distribute communication lines,
An access door 55 is provided on the upper surface to allow an operator to enter and exit, and a blind hole 56 for drawing out a communication line is provided in the blind plate 52. The lead-out hole 56 may be provided on the side surface of another buried groove in which the access door is similarly provided.

The telescopic buried groove 48, as seen in FIG.
Insert the inner insertion hollow groove 58 from both ends of the outer insertion hollow groove 57, and adjust the total length by inserting sealing materials 59, 60 and stoppers 61, 62 in the gap between the outer insertion hollow groove 57 and the insertion hollow groove 58. However, it corresponds to the fractional length of the wiring path where the fixed buried groove cannot be used. Normally, the connection and extension of the fixed buried groove 49 and the branch basin 47 (see Fig. 14)
To use. FIG. 15 is a partially cutaway perspective view of the expansion / contraction embedding groove 48 of which the total length is adjusted, and FIG. 16 is a partially cutaway perspective view of the expansion / contraction embedding groove 48 in which the interior hollow groove 12 is fully drawn. As can be seen in FIG. 15 or FIG. 16, the stoppers 61, 62 are sealing materials 59,
The stoppers 61, 62 are arranged in a positional relationship of being sandwiched by 60 and contact the stoppers 61, 62 before the sealing materials 59, 60 in a state where the hollow hollow groove 58 is extended.

In this example, the outer insertion hollow groove 57 is provided with a seal material 59 on the inner peripheral four surfaces of both end surfaces and a stopper 61 on the inner peripheral four surfaces inside the seal material 59. 11 is a stopper 62 on the four outer peripheral surfaces of the position where it engages with the stopper 61,
A sealing material 60 is attached to the outer peripheral four surfaces of the stopper 62. By arranging the stoppers 61, 62 and the sealing materials 59, 60 in this relationship, even if the internal hollow groove 58 is pulled out to the full extent, the stopper 6 and the sealing materials 59, 60 are provided before the sealing materials 59, 60.
1,62 do not abut, and the sealing materials 59,60 are not deformed or damaged. This telescopic buried groove 48, as seen in FIG.
With the insertion hollow groove 58 inserted into the outer insertion hollow groove 57 to the extent that it can be moved in either direction, the branch rod 47 and the fixed embedded groove
It is preferable to set the length so as to be connected to 49, because there is a margin for advancing and retreating to the insertion hollow groove 58 from the outside by a load.

FIG. 17 is a partial perspective view showing a connecting portion such as expansion and contraction or fixed buried grooves in this example. The expansion / fixation buried grooves or the buried groove and the connecting portion of the branch basin are bolted and connected to each other in a state where the seals attached to the flange surface provided at the end of the buried groove or the end surface of the connecting portion are in close contact with each other.
In the present invention, as seen in FIG. 17, a plate member is horizontally welded to the lower edge of the flange 54 or the connecting portion 51 to form the groove hooking portion 53, and the expansion / consolidation embedded groove 48 (two-dot chain line in FIG. 17) to be connected. The lower edge of the flange 54 provided at the end of () is supported by the groove locking portion 53.

In the fixed buried groove 49, earth pressure (Fig.
7 Refer to the white hollow down arrow), and the load may sink the flange 54 having a vertical surface, and further apply a large shearing force to the bolt to expand or contract or break the connection of the fixed buried grooves 2 and 3. . The groove retaining portion 53 is a stretchable or fixed buried groove 48, 49.
Has a horizontal surface with respect to the sinking direction of and supports the lower edge of the flange 54 of the connecting telescopic embedding groove 48 (see the black arrow in Fig. 17)
However, it has an action of preventing the sinking of the expansion / contraction or fixed buried grooves 48, 49 and relaxing the shearing force of the bolt. Further, the groove hooking portion 53 provided at the lower edge of the flange 54 is expanded or contracted by bringing the lower edge of the flange 54 of the expandable embedded groove 48 into contact when leveling in the laying work of the expandable embedded groove 48. This has the advantage of facilitating the connection work between the fixed buried grooves or between the buried groove and the connecting portion of the branch basin, and reduces the cost required for the laying work.

The groove retaining portion is not limited to a structure for welding flat plates as long as the above-mentioned action can be realized. For example, Figure 18
As can be seen in FIG. 5, the lower edge of the flange 54 may be bent to be horizontal to form the groove hooking portion 63. The groove hooking portion 63 having a structure continuous with the flange 54 has an advantage that a welding operation is not required and a stretchable or fixed buried groove can be provided at a lower cost. Further, a plate member may be horizontally welded to the upper edge of the flange 54 or the connecting portion to form the groove hooking portion 64. The groove retaining portion 64 mainly has a function of relaxing the shearing force of the bolt and preventing the sinking of the embedded groove provided with the groove retaining portion 64, and as shown in FIG. It is effective to use both in combination, such as providing the groove retaining portion 64 on the upper edge of the flange 54 and the groove retaining portion 53 on the lower edge of the flange 54 of the fixed buried groove 49 to be received.

FIG. 20 is a perspective view of the unitary groove 50, 50, 50 having a bending angle of 10 degrees in the electric wire common groove of FIG. 14, in which three bodies are connected, and FIG. 21 is a unit having a bending angle of 10 degrees. Buried groove 50 and
FIG. 22 is a perspective view of a form in which a unit buried groove 65 having a bending angle of 20 degrees is connected, and FIG. 22 is a unit buried groove having a bending angle of 10 degrees.
FIG. 5 is a perspective view of a form in which 50 and 50 are alternately turned and connected. The unit embedding grooves 50, 65 have a structure in which an extremely short hollow groove is bent (or curved) .By connecting a plurality of unit embedding grooves with the same or different bending angles, the wire joint groove with a bent wiring path can be formed. Can be built.

Normally, since the wiring path is bent at a predetermined angle in a predetermined direction, as shown in FIG. 20, the unit buried grooves 50, 50, 50 are formed.
A form of connecting a plurality of is a general usage. In this case, as shown in FIG. 21, unit embedding grooves 50 and 65 having different bending angles may be connected. In this way, if unit buried grooves having a bending angle of 2 to 3 types are prepared, the wiring path can be bent in any direction and angle by combining these.

As a special use method, as shown in FIG. 22, the unit embedding grooves 50, 50 having the same bending angle are
If they are connected so that the bending directions thereof are staggered, the axis of the linear wiring path can be slightly shifted. Furthermore, it is possible to construct a continuous electric wire joint groove by filling a fractional length which is too long even with a telescopic buried groove when these unit buried grooves are connected to a normal fixed buried groove. If a unit buried groove of a certain degree, that is, a straight unit buried groove having an extremely short length is connected as needed, it can be used in place of the expandable buried groove.

Each buried groove of the present invention is usually applied to a buried groove of a steel pipe having a rectangular cross section as shown in each embodiment, but the invention is not limited to this, and the buried trench formed by bundling round steel pipes is not limited to this. It can also be applied to trenches and buried trenches made of concrete. However, the buried groove made of concrete has a problem in vibration resistance, and the buried groove formed by bundling the round steel pipes has a problem that the sectional area becomes large and the cost of the laying work is increased, which is not practical. The buried groove made of steel pipe having a rectangular cross section overcomes such conventional problems, and by applying the structure of the present invention, it is possible to greatly reduce the laying work cost and contribute to the expansion of the optical fiber network by underground wiring. Can be done.

[0055]

As described above, according to the present invention, it is possible to construct a wire joint groove having a higher degree of safety than the conventional concrete buried groove, and the installation cost thereof is relatively low. Also, by combining a small number of buried grooves, it is possible to construct an electric wire joint groove having a flexible wiring path, so that a free installation plan can be made, and that plan restrains the actual installation work and Less likely to make it difficult.

In particular, when the electric wire common groove of the present invention is made of steel pipe, it is possible to exhibit extremely high earthquake resistance as compared with the case of using the concrete embedded groove. Its earthquake resistance includes "fail safe" and "life line"
As a result, it is possible to avoid the damage of the communication network, and to maintain the communication network more needed in an emergency. The effect of the electric wire common groove of the present invention is widely applicable not only to the common groove for underground wiring of gas and water, but also to all underground facilities, and it is possible to improve the earthquake resistance of each underground facility as a whole. It will be possible.

Further, the buried groove of the present invention significantly reduces the cost, labor, etc. required for laying the metallic buried groove,
As a result, it will be possible to promote the expansion of underground wiring such as an optical fiber network by the electric wire common groove more easily and cheaply. The construction of an optical fiber network is indispensable as an infrastructure supporting an information-oriented society, and the present invention supports this from the practical aspect of promoting the laying of a common groove for electric wires.

Specifically, the expansion / contraction buried groove has an appropriate length by making it possible to make a buried groove of a required length on site in accordance with an actual wiring path length different from the design. In addition to eliminating the labor and cost of separately manufacturing a deep buried trench, in the electric wire joint trench after laying, it acts as a buffer mechanism of the wiring route that absorbs fluctuations from the outside such as an earthquake, and safe underground wiring Enables installation of.

In addition to simplifying the laying work, the groove hooking portion contributes to prolonging the life of the burying groove after laying, and the unit burying groove allows for slight bending of the wiring route and fine adjustment of the length on site. By doing so, it contributes to the cost reduction of the laying work as a whole. The above effects extend not only to the buried groove made of a metal tube, especially a steel tube having a rectangular cross section, but also to a conventional round steel tube or a buried groove made of concrete, and further expand the wire joint groove. Of.

[Brief description of drawings]

FIG. 1 is a perspective view showing a construction state of an electric wire common groove of the present invention.

FIG. 2 is a partially cutaway perspective view of a closed groove.

FIG. 3 is a cross-sectional view of a closed groove that employs Partition Example 1.

FIG. 4 is a cross-sectional view of a closed groove that employs Partition Example 2.

FIG. 5 is a partially cutaway perspective view of an open groove.

FIG. 6 is a partially cutaway perspective view of an access panel.

FIG. 7 is an enlarged perspective view of a hanger provided inside the groove.

FIG. 8 is a perspective view of a joint structure including a frame body.

FIG. 9 is a perspective view of a joint structure having added swingability.

FIG. 10 is a perspective view of a branch rod (the one at the left end in FIG. 1).

FIG. 11 is an enlarged cross-sectional view of a connecting portion showing a state in which closed grooves are connected.

FIG. 12 is a branching rod having a shape having connecting portions in five directions.

FIG. 13 is a perspective view of a retractable closed groove.

FIG. 14 is a perspective view of an electric wire common groove constructed with a buried groove using the structure of the present invention.

FIG. 15 is a partially cutaway perspective view of the expansion / contraction embedding groove with its total length adjusted.

FIG. 16 is a cutaway perspective view of the same portion of a telescopic embedding groove in which the interior hollow groove is fully drawn out.

FIG. 17 is a partial perspective view showing a groove hooking portion welded to the lower edge of the flange.

FIG. 18 is a partial perspective view showing a groove hooking portion obtained by bending the lower edge of the flange.

FIG. 19 is a partial perspective view showing a groove hooking portion welded to a lower edge and an upper edge of a flange.

FIG. 20 is a perspective view of a form in which three unit embedded grooves having a bending angle of 10 degrees are connected.

FIG. 21 is a perspective view of a form in which unit embedded grooves having bending angles of 10 degrees and 20 degrees are connected.

FIG. 22 is a perspective view of a configuration in which unit embedded grooves having a bending angle of 10 degrees are alternately connected.

[Explanation of symbols]

 1 Electric wire common groove 2 Branch box 3 Closed groove 4 Open groove 7 Branch box

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Eiji Noji Eizo Noji 8-926, Commerce Center, Nishi-ku, Hiroshima City, Hiroshima Prefecture Noji Tech Co., Ltd. None) Kawasaki Steel Co., Ltd. Mizushima Steel Works (72) Inventor Shinobu Iwao 1-1, Mizushima Kawasaki-dori, Kurashiki-shi, Okayama Mizushima General Service Co., Ltd.

Claims (7)

[Claims] 1. An electric wire common groove constructed by connecting buried grooves made of a metal pipe, wherein the buried groove has a closed structure with a partition inside and an open structure with an outlet for a communication line or the like on a side surface. An electric wire joint groove constructed from a buried groove and a buried groove of a branching rod structure provided with a connecting portion of a plurality of closed or open structure buried grooves. 2. A wire joint groove constructed by connecting buried grooves made of a metal pipe, which comprises a square steel pipe or a hollow groove having a U-shaped steel plate in cross section closed with a steel plate, and a partition provided inside thereof. An embedded groove with a closed structure that divides the cross section of a steel pipe or hollow groove into a grid shape and secures a path for multiple electric wires. 3. An electric wire joint groove constructed by connecting buried grooves made of a metal pipe, which comprises a rectangular steel pipe or a hollow groove in which a steel plate is substantially U-shaped in section and is closed with a steel plate, and a work window is opened on the upper surface. , A buried groove having an open structure in which a side surface is provided with a drawing hole for drawing out a communication line or the like. 4. An electric wire joint groove constructed by connecting buried grooves made of metal pipes, which is a hollow columnar body formed of a steel plate, has a work window opened on the upper surface, and has a closed structure or an open structure. An embedding groove having a branching structure, in which a plurality of connecting portions for connecting with and are provided in the same or different layers on the side surface of the columnar body, or with an extraction hole for extracting a communication line or the like. 5. In an electric wire joint groove constructed by connecting buried grooves made of metal pipe, two or more hollow grooves are fitted to each other, and a seal provided on the outer surface of the hollow groove for insertion is fitted on the outer surface of the hollow groove. A closed structure or opening characterized in that the entire length can be expanded and contracted by slidingly contacting the inner surface of the hollow groove, or by making a seal provided on the inner surface of the outer insertion hollow groove slideably contacting the outer surface of the inner insertion hollow groove. The buried groove of the structure. 6. An electric wire common groove constructed by connecting buried grooves made of a metal pipe, wherein a groove hooking portion for supporting an edge portion of the connected buried groove is provided at an upper edge or a lower edge of an end surface of the hollow groove. A buried groove having a closed structure, an open structure, or a branched structure, which is characterized in that 7. An electric wire joint groove constructed by connecting buried grooves made of metal pipe, wherein both end surfaces of the hollow groove are in a relationship of forming a predetermined angle, and are formed when another buried groove is connected to each end surface. A buried groove having a closed structure or an open structure, which is capable of curving or bending a wiring path to be formed.