JP2003274546A - Assembling method for concrete box and prefabricated unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an assembling method with good workability when assembling a cubic concrete box along the path of underground wiring. <P>SOLUTION: A unit 10 for assembling the cubic concrete box is fabricated with an U-shape subunit 41 and a subunit 42 of end wall. For that purpose, an end face 43 is provided with the U-shape subunit 41 in which a plurality of inserts 43 are embedded, and the subunit 42 of end wall around which a plurality of holes 45, in which a bolt is inserted, are formed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to underground wiring work for burying cables for power, communication, etc. in the ground.
The present invention relates to a concrete box useful for laying cables for branching and connection.

[0002]

2. Description of the Related Art In underground wiring work, concrete boxes such as large and small handholes are used for laying work such as branching and connection of cables. As shown in FIG. 12, these concrete boxes are rectangular boxes having a substantially square bottom surface, and many of them are factory prefabricated so as to shorten the construction time on site. The large-sized handhole 1 is divided into upper and lower units in the vertical direction, prefabricated in a factory, and assembled at the site, in consideration of reduction of the transportation weight.

In recent years, the undergrounding of electric power cables has progressed,
In addition, the amount of underground wiring such as communication cables and optical fiber cables has increased significantly. As a method of laying a large amount of cables along a road or the like, conventionally, a plurality of units 2 each having a U-shaped cross section as shown in FIG. 13 are installed to bury a ditch for laying a cable, and the cables are laid inside the ditch. A construction method in which the lid 4 is placed after being laid has been adopted. And
When it is necessary to bury a cable in the ground, place concrete on site at the end of the U-shaped laying groove, and wrap the perforated porcelain pipe or cable burying pipe in the end wall placed at this site. By doing so, the cable can be laid from the U-shaped laying groove to the porous ceramic pipe or the cable burying pipe.

[0004]

The gutter for laying a long U-shaped unit along the main route of the cable is
It is convenient because it is easy to secure a large wiring space along the road or sidewalk. However, at the place where the cable is buried, it is necessary to place a concrete wall on the site at the end of the U-shaped unit, which is troublesome. In addition, water leaks often occur if the on-site concrete and the U-shaped unit are not in close contact with each other. Therefore, in addition to skilled techniques, construction work such as ground maintenance is required. Furthermore, in recent years
In many areas such as urban areas where there is a lot of interference with other buried objects, there is a lot of wire burying work, and for the purpose of reducing the construction cost related to wire burying, most of the cable routes are perforated porcelain pipes and buried conduit A method of burying it underground and using only the parts necessary for laying work such as branching and connecting into a box is being studied. If such a construction method is adopted, if a box is formed using U-shaped gutters, the number of spots where the wall is cast in-situ will increase significantly, resulting in an increase in construction cost and a longer construction period. In addition, the probability of causing problems such as water leakage also increases.

Further, these large U-shaped units are often prefabricated in factories and are brought into the field from the factories. Therefore, it would be desirable to be able to reduce the labor involved in assembling concrete boxes and prefabricated units.

[0006]

Therefore, according to the present invention, there is provided a method for assembling a substantially rectangular concrete box used for laying underground wiring, wherein one end of the substantially rectangular concrete box is constructed. Provided is an assembling method characterized in that an end wall having a plurality of holes through which bolts are formed is attached to a unit in which a plurality of inserts are embedded in an end surface to which the wall is attached. That is, in the present invention, it is a prefabricated unit that constitutes a part of a substantially rectangular concrete box used for laying underground wiring, and is used as an end face to which one end wall constituting the substantially rectangular concrete box is attached. Provided are a prefabricated unit in which a plurality of inserts are embedded and a prefabricated unit in which one end wall forming a substantially rectangular concrete box is formed with a plurality of holes through which bolts are passed. Used to assemble prefabricated units and concrete boxes. Conventionally, when connecting a buried pipe to both ends of a U-shaped unit, it was necessary to pour a concrete wall on the site, whereas in the concrete box of the present invention, the edges of two units are connected to each other. The box can be constructed simply by connecting.

The end wall can be provided with a knock hole region in which a part of the wall is thin. Further, a member such as a bell mouth suitable for cable work can be embedded in the end wall in advance.

Further, by prefabricating the end wall, the side wall, and the bottom wall as one unit, labor on site can be saved and the construction period can be greatly shortened. Therefore, the workability is good, and the assembly of the concrete box is completed in a short period of time. Further, since there are few connecting points, the possibility of trouble such as water leakage is small.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a concrete unit. Further, FIG. 2 shows a state in which a concrete box 20 for underground wiring is assembled using this unit 10. As shown in these figures, this concrete unit 10 has a shape in which a box 20 is divided in a substantially horizontal direction in which an underground wiring 30 extends (in this example, a horizontal direction in the drawing). Therefore, this unit 10 includes one end wall 1 of the box 20.
1 and the wall 12 that is substantially the right half of the side walls 12 and 13
a and 13a, and a bottom wall 14a that is substantially the right half of the bottom wall 14 of the box 20 are prefabricated concrete units. Each end wall 11 and side wall 1
2a and 13b, and the bottom wall 14a are substantially rectangular plate-shaped members, which are molded by a factory prefab so as to be integrated. Therefore, the unit 10 has pre-fabricated walls 12a and 13b on both sides of the end wall 11 when viewed from above, and when the unit 10 is viewed from the left front, side walls on both sides of the bottom wall 14a. 12a
And 13a are prefabricated in a substantially U shape. As for the size of the unit 10, for example, the inner length of the end wall 11 is about 1500 mm, the inner length of the side walls 12a and 13b is about 750 mm, and the inner height is about 1200 mm. Therefore, the two units 10a and 10b face each other in the horizontal direction (left and right in the drawing) as shown in FIG. 2, and the side walls 12a and 13a and the edge 15a of the bottom wall 14a are arranged.
Then, by connecting the edges of the side walls 12b and 13b and the bottom wall 14b, the concrete box 20 having a substantially square bottom surface and a depth of about 1200 mm is assembled.

The upper edge 16 of the end wall 11 and the side walls 12a and 13a of the unit 10 is formed in a stepped shape so as to receive a lid. Therefore, as shown in FIG. 2, when the two units 10a and 10b are combined in a box shape, a lid receiver on which a substantially square lid 25 can be placed is formed at the upper edge of the box. Lid 25
May be made of concrete, or may be a steel plate or a combination of a steel plate part and a concrete part.

At a portion below the end wall 11 of the unit 10, a thin portion 1 having a wall thickness reduced to about 1/2 to 1/3.
7a and 17b are formed horizontally. The thin regions 17a and 17b are knock hole regions where through holes can be easily opened on site, and holes can be easily formed on the site for penetrating the cable by using a hammer or the like. The knock hole regions 17a and 17b prepared in the end wall 11 of the unit 10 have a diameter of 100 mm.
The hole for cable laying is provided in a size such that it can pass through the perforated porcelain pipes 31 each having three rows and three columns in total. Therefore, at the site, a hole for penetration is made by using a knock hole area on an appropriate side, and the cable is drawn into the concrete box 20 from the cable burying path 31 using a perforated porcelain tube or the like as shown in FIG. be able to. Also, the knock hole regions 17a and 17 which are horizontally arranged
A portion 18 having a normal wall thickness is formed between 7b. Therefore, the wall thickness is small and the knock hole region 17a having a relatively large area is formed.
Even when 17 and 17b are present on the left and right sides of the end wall 11, sufficient strength can be secured not only for the end wall 11 but also for the entire unit 10 by the thick portion 18 of the substantially central wall.

Side walls 12a and 13 of this unit 10
There are also three knock hole regions 19a and 19b in each of a.
And 19c are prepared. These knock hole regions 19a to 19c are regions for penetrating a cable branched from the cable laid through the cable burying path 31 which is the main path. Therefore, these areas 19a
As shown in FIG. 2, a buried conduit 32 for laying a cable such as Eflex is attached to each of the cables 19 to 19c. Then, if necessary, a branched power or communication cable or optical fiber cable is laid inside the buried conduit 32.

As described above, when this unit 10 is adopted, a large box for underground wiring can be formed only by horizontally assembling the two units 10a and 10b. Therefore, there is only one place to be connected when assembling the box 20. These units 10a and 10
Although b can be easily coupled by various methods, for example, inserts 22 are embedded in the vicinity of the edge 15 to be connected, and by fixing a plate made of metal or plastic to these inserts 22, the units can be solidified. Can be connected. Therefore, as compared with the case where the U-shaped unit shown in FIG. 13 is used to form the end wall by assembling the mold on site, the labor for constructing the box is very small, and only the units 10a and 10b are connected. Good. Therefore, the concrete box using this unit has good workability, and the labor for assembling the box 20 can be reduced. In addition, there is no need to consider the connection between cast-in-place concrete and prefabricated units,
Since the end walls are integrally molded at the factory, there are few places that cause water leakage, and reliable construction is possible, and a highly sealed box can be formed.

Further, in this unit 10, the side wall and the bottom wall are prefabricated to the end wall 11. Therefore, compared with the U-shaped unit, even if the wall thickness is thin, sufficient strength for transportation and storage can be secured. Therefore, the weight of the entire box as well as the unit can be reduced, and the manufacturing cost can be reduced. In addition, it is possible to prevent cracks and cracks in the wall during transportation and storage,
There are few construction problems, and the box can be constructed reliably in a short period of time. Further, in the unit 10, in contrast to the U-shaped unit, the side walls 12a and 13a forming the U-shape or the U-shape are supported by the bottom wall 14 and the end wall 11 from two directions. Therefore, the strength of the unit is higher than that of the U-shaped unit, and the handling in the construction is easy. Furthermore, when assembling boxes of the same length, this unit 10
The length of each unit is about half that of the conventional U-shaped unit. Therefore, the overall size per unit is reduced, and this unit is also excellent in transportability, storage, and workability in this respect as well.

Further, in the unit 10, as described above, even if the lengths of the side walls 12a and 13a are slightly shortened or lengthened due to the shape thereof, sufficient strength can be secured during transportation, storage and construction. Therefore, it is possible to easily construct a concrete box having a length according to the size of the site. In the U-shaped unit shown in FIG. 13, if the box is not long enough, it is necessary to prepare a short unit for adjustment, but this unit adjusts the side wall length when prefabricating. By doing so, the length of the box can be adjusted. In addition, the conventional U-shaped adjustment unit with a short length is easily damaged during transportation, but this unit is integrated with the end wall even if the side wall length is a little short. Since it can be secured, troubles during transportation can be prevented.

Further, since this unit 10 is prefabricated into a shape excellent in strength, it is possible to secure a large knock hole region in the side walls 12 and 13 or the end wall 11. In the conventional U-shaped unit, if the area ratio of the knock hole region becomes high, it is necessary to deal with it by increasing the surrounding wall thickness, so that the strength will be greatly reduced, or conversely it will be very heavy and difficult to handle. . On the other hand, in this unit 10, since the side wall and the bottom wall are prefabricated around the end wall 11, sufficient strength can be secured even if the area ratio of the knock hole region is large. Therefore, the handling in handling and construction becomes easy, and the end walls 12 and 13 and the bottom wall 1 are
4 and the end wall 11 can be made thinner, and the ratio of the knock hole region can be increased. Therefore, the degree of freedom in designing the box can be increased, the weight of the box can be reduced, and the manufacturing and construction costs can be reduced.

FIG. 3 shows an example of different units. This unit 10 is also a concrete block having a shape for assembling a substantially rectangular box, and has an end wall 11 and side walls 12a and 13a on both sides thereof.
Further, it is provided with a part 14a of the bottom wall, which are integrally molded by a factory prefab.

An approximately square knock hole region 17 having a thin wall thickness is provided below the center of the end wall 11 and two circular knocks are provided below the side walls 12 and 13 on both sides. A hole area 19 is prepared. In addition, a plurality of inserts 22 are embedded along the edge 15 on the connection side, and the units 10 arranged adjacent to each other are
Also, it can be connected to the U-shaped unit shown below. The upper edge 16 is a lid receiver.
The unit 10 shown in FIG. 3 is slightly narrower than the unit shown in FIG. 1, and for example, the inner length of the end wall 11 is 900.
It is about mm. In addition to this, units of various sizes can be adopted.

FIG. 4 shows how the unit 10 is used to assemble a concrete box 20 for laying underground wiring. Further, in FIG. 5, the cable of the main route is drawn from the end wall 11 by using the perforated ceramic tube 31 in the assembled box 20, and the conduit tube 32 is provided on the side wall.
It is shown that the is attached. This box 20
The unit 10 is attached to both sides of the U-shaped unit 28 and assembled. Therefore, a box longer than the box shown in FIG. 2 is assembled along the main path of the buried wiring. If you need a longer box 20,
Construction can be performed by connecting a plurality of U-shaped units 28 and connecting the units 10 on both sides thereof. Therefore, by using this unit 10 in combination with the U-shaped unit 28, the box 20 of various lengths can be obtained.
Can be easily installed. In this way, the unit 10 according to the invention can easily construct concrete boxes having different sizes in the longitudinal direction. As described above, the lengths of the side wall and the bottom wall of the unit 10 may be adjusted finely according to the site. It is also possible to use this unit 10 in combination with the U-shaped unit shown in FIG. 13 on site.

After the box 20 is assembled, as shown in FIG. 5, the knock hole region 17 of the end wall 11 is perforated in the field, and the cable of the main route is drawn through the perforated ceramic tube 31. Of course, it is not limited to the perforated porcelain tube, and the cable burying path 31 can be formed by using a conduit tube made of concrete such as culvert or eflex, and the cable including the optical fiber can be drawn from the end wall 11 into the box. .
Furthermore, a plurality of knock holes are prepared in the side wall of the box 20, and a plurality of electric conduits are attached through these. Therefore, through these conduits 32, it is possible to pull out the cables that are branched from the cables of the main route inside the box 20 and are connected to the home, factory, office, or the like. Inside the box 20, a cable support for installing a cable and a sufficient space 29 for routing the cable are secured.
By using 0, laying work such as cable connection and additional installation can be easily performed.

FIG. 6 shows a state of the box 20 seen from above, and FIG. 7 shows a state in which the box 20 is constructed by using a cross section. As described above, the box 20 is assembled by the U-shaped unit 28 and the unit 10 having the end wall, and a long box can be constructed along the main route of the underground wiring. Therefore, it is a suitable box when laying cables along roads and sidewalks, and it is possible to perform connection work between cables using the box, branch work to homes and offices, and additional cable installation work. Easy to do.

The box 20 is installed on the crusher run 6 and the level concrete 7 constructed on the excavated ground with the mortar 8 laid. Then, a cable buried path 31 for underground wiring such as a multi-hole ceramic pipe is connected to the box 20. When a plurality of cable buried paths are provided, the other cable buried path may be buried along the side wall of the box 20. When the connection of the cable burying path is completed, the box and the cable burying path are backfilled to the height of the lid 25 installed on the top of the box 20. The buried conduit 32 installed on the side wall of the box 20 may be constructed at the same time as the box, or may be constructed after re-excavation if necessary. It is also possible to provide a conduit 33 for ground wiring through the lid 25 and use this conduit 33 to lay a cable.

As described above, by using the unit in which the end wall, the side wall and the bottom wall are integrated, a large box for laying a large cable having a substantially rectangular bottom can be easily constructed. It is easy to adjust the length of the concrete block along the underground wiring, and in the future, electric power for underground burying along roads, electric wires for communication etc., laying work of cables such as optical fibers It is suitable for. The unit provided with the end wall has few connecting points and is excellent in workability, and since its shape has high strength, troubles such as transportation, storage, and damage during construction can be prevented in advance. In particular, the end wall usually requires a knock hole area with a thin wall for drawing the cable from the buried path, but with this unit, sufficient strength can be maintained even if the knock hole area is prepared. it can. Further, since the lengths of the side wall and the bottom wall which are integrated with the end wall can be adjusted and prefabricated, a piece for dimension adjustment becomes unnecessary. in this way,
By adopting this unit, a concrete box for underground wiring can be constructed in a short period of time, and troubles such as damages that occur during transportation, storage, or construction can be prevented.

FIG. 8 shows a different example of the unit. Further, FIG. 9 shows an example in which a concrete box 20 for underground wiring is constructed using the concrete unit 10. This unit 10 is also a concrete block having a shape for assembling a substantially rectangular box, and has an end wall 11 and side walls 12 on both sides thereof.
a and 13a, and a part 14a of the bottom wall, which are integrally molded by a factory prefab. On the end wall 11 of the unit 10, a plurality of substantially circular knock hole regions 17 are arranged vertically and horizontally, and each of these knock hole regions 17 is arranged as shown in FIG. The buried conduit 32 can be installed. In addition, the side wall 13 of the unit 10 has a large square knock hole region 27 so that a transformer or the like can be installed.
Is prepared. Therefore, this unit 10 includes two units 10a and 10b which are formed in symmetrical shapes.
The box 20 can be easily constructed by connecting and constructing on the spot.

This unit 10 is suitable for a site where the cable main line 30 is composed of a plurality of embedded conduits 32, and the knock hole regions 17 have conduits such as steel pipes and vinyl chloride pipes and flexible shapes. A route for underground wiring can be constructed by connecting electric conduits. The shape of the knock hole region provided on the side walls 12 and 13 or the end wall 11 is not limited to this example, and a shape suitable for the situation at the site, the configuration of the cable route to be constructed, and the like can be adopted. Also, if the position where the conduit is to be installed is fixed, a through hole may be formed instead of such a knock hole area, or a member suitable for cable work such as a bell mouth may be used. Of course, it may be buried in advance. The types, numbers, positions, etc. of these knock hole regions and through holes provided in the unit 10 are substantially the same depending on the area to be constructed, the cable route to be constructed, and the like. Therefore, by prefabricating the unit 10 designed in accordance with it and delivering it to the site in advance, it is possible to construct a box for underground wiring in a short period of time. The entire wiring route can be constructed in a short period of time.

FIG. 10 shows a unit according to the present invention. Further, FIG. 11 shows a state in which a concrete box for underground wiring is constructed using the unit 10 of this example. In the unit 10 of this example, a subunit 41 made of concrete having a substantially U-shaped cross section constituting the side walls 12 and 13 and the bottom wall 14 and a concrete plate 42 constituting the end wall 11 are separately molded, It is assembled in a factory and prefabricated into an integral unit 10. In order to assemble the U-shaped subunit 41 and the end wall subunit 42, a plurality of inserts 44 are embedded in the end face 43 of the U-shaped subunit 41, and the end wall subunit 42. A plurality of holes 45 for passing bolts are formed around the hole. Then, the end wall subunit 42 is attached to the U-shaped subunit 41 at the factory to assemble the unit 10 in which the end wall 11 is prefabricated with the side walls 12, 13 and the bottom wall 14.

Also in the unit 10 of this example, the end wall 11
Since it is prefabricated including, the strength during transportation is sufficiently high, and the work of constructing a concrete box on site can be greatly reduced. Furthermore, by attaching the end wall subunit 42 to the U-shaped subunit 41 in a well-equipped factory, packing and reinforcement can be easily performed, so problems such as water leakage from this connection part can be prevented. can do. Further, as shown in FIG. 11, the unit 10 ′ for adjusting the length is insufficient in strength only by the U-shaped subunit 41 ′, but the unit 10 ′ which is prefabricated to have the end wall 11 is provided. Since it can be shipped as', it is possible to prevent problems such as cracks and cracks during transportation.

By using the prefabricated unit according to the present invention as described above, it is possible to construct a large-sized concrete box which is long in the cable laying direction and has a substantially rectangular bottom surface in a short period of time. Such a large box is important in the construction work of underground wiring, which will increase in the future, and is used for branching to homes, offices, factories, etc., and connecting various cables. It The size of these concrete boxes is increasing, and by using the unit of the present invention, it is possible to construct concrete boxes of various sizes from small to large in a short period of time.

[0029]

As described above, according to the present invention, a prefabricated unit that constitutes a part of a substantially rectangular concrete box used for laying underground wiring is provided. A prefabricated unit in which a plurality of inserts are embedded in the end surface to which one of the end walls to be configured is embedded, and one end wall that constitutes a substantially rectangular concrete box in which a plurality of holes for passing bolts are formed in the periphery. And a prefabricated unit, which can be used to assemble the prefabricated unit and the concrete box.

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic shape of a concrete unit having an end wall.

FIG. 2 is a perspective view showing a state where a box for underground wiring is assembled using the unit shown in FIG.

FIG. 3 is a perspective view showing a schematic shape of a different example of a unit including an end wall.

FIG. 4 is an exploded perspective view showing how a box for underground wiring is assembled using the unit shown in FIG. 3 and a U-shaped unit.

FIG. 5 is a perspective view showing a state in which a cable burying path is connected to the underground wiring box assembled in FIG. 4;

FIG. 6 is a view from above showing the installed state of the underground wiring box.

FIG. 7 is a view showing a state in which a box for underground wiring is installed by using a cross section.

FIG. 8 is a perspective view showing a schematic shape of a different example of the unit including the end wall.

FIG. 9 is a diagram showing an outline of a concrete box for underground wiring assembled using the unit shown in FIG.

FIG. 10 is a perspective view showing a state where the unit including the end wall according to the embodiment of the present invention is assembled.

FIG. 11 is an exploded perspective view showing how a box for underground wiring is assembled using the unit shown in FIG.

FIG. 12 is a diagram showing an example of a conventional underground wiring box.

FIG. 13 is a view showing a gutter for laying a cable using a conventional U-shaped unit.

[Explanation of symbols]

10 ... Prefabricated unit with end wall 11 ... End wall 12, 13, ... Side wall 14 ... Bottom wall 15 ... Connection edge 16 ... Upper edge 17-Knock hole area 19 ... Side wall knock hole area 20 ... Box for underground wiring 25 ... Lid 27 ... Square knock hole area 30..Main route of underground wiring 31..Cable buried path 32..Built-in conduit tube for cable 41 .. Subunit for side wall and bottom wall 42..Subunit for end wall 44 ... Insert 45 ... Bolt holes

Claims (11)

[Claims] 1. A method of assembling a substantially rectangular concrete box used for laying underground wiring, wherein a plurality of inserts are embedded in an end face to which one end wall of the substantially rectangular concrete box is attached. The assembly method, wherein the end wall having a plurality of holes around which bolts are formed is attached to the existing unit. 2. The assembly method according to claim 1, wherein the end wall is provided with a knock hole region in which a part of the wall is thin. 3. The assembly method according to claim 1, wherein a member suitable for cable construction is embedded in the end wall in advance. 4. The assembling method according to claim 1, wherein a bell mouth is embedded in advance in the end wall. 5. A prefabricated unit that constitutes a part of a substantially rectangular concrete box used for laying underground wiring, wherein a plurality of prefabricated units are attached to one end wall of the substantially rectangular concrete box. Prefabricated unit in which the insert of is embedded. 6. A prefabricated unit which constitutes a part of a substantially rectangular concrete box used for laying underground wiring, wherein one end wall constituting the substantially rectangular concrete box comprises: A prefabricated unit that has multiple holes through which bolts pass. 7. The prefabricated unit according to claim 6, wherein a part of the wall is provided with a knock hole region. 8. The prefabricated unit according to claim 6, wherein a member suitable for cable construction is embedded. 9. The prefabricated unit according to claim 6, wherein a bell mouth is embedded in the end wall. 10. A prefabricated unit assembled using the prefabricated unit according to claim 5 and the prefabricated unit according to claim 6. 11. A concrete box assembled by using the prefabricated unit according to claim 5 and the prefabricated unit according to claim 6.