JPH10325155A - Reconstruction method of existing manhole and manhole utilizable for communication cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reconstruction method of an existing manhole in which a conventional existing manhole can be easily reconstructed into one which can be used for communication cables capable of efficiently connecting, branching, repairing, and inspecting the communication cables laid in an underground conduit network. SOLUTION: A slant type oblique wall pipe 6, first and second regulating rings 7', 8', and a lid receiving frame 9' constituting the upper wall of an existing manhole 1' are removed. A third straight wall pipe 13, an upper straight wall pipe 14, first and second regulating rings 7, 8, and a lid receiving frame 9 having the nearly same inner diameter as that of a second straight wall pipe 5 are in order laminatedly fixed on the second straight wall pipe 5 to be a skelton straight wall pipe forming the truck part of the existing manhole 1', and hence a manhole 1 which can be used for the communication cable is constructed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided in the middle of an underground road network, such as a water and sewage pipe network, an underground communication network, an underground common channel network, or at a branch point between a main pipe (main line) and a branch pipe (branch line). The present invention relates to a method for rebuilding an existing manhole to a communication cable compatible manhole and a construction method of a communication cable compatible manhole, in particular, it is possible to widen an upper space and branch or connect a communication cable. TECHNICAL FIELD The present invention relates to a technique for remodeling a communication cable compatible manhole in which a communication cable branch box (connection box) can be attached and fixed to an upper inner periphery of the communication cable compatible manhole.

[0002]

2. Description of the Related Art Recently, it is said that it is necessary to construct an underground pipeline network for communication cables in order to bury communication cables such as optical fiber cables underground. However, there is a problem that the cost required for constructing the underground pipeline network for the communication cable is extremely high. On the other hand, in order to solve this problem, a method of laying a communication cable in each home using a water supply and sewage pipe network which is recently provided in an urban area has been considered.

[0003] In any of the above-mentioned underground pipeline networks or sewage piping networks, in order to draw communication cables into individual houses, a branch branch cable and a house line branched from a communication main line cable are used. It was necessary to draw in individual houses.

[0004] As described above, in branching a branch branch cable from a communication main line cable, for example, Japanese Patent No. 257
As shown in Japanese Patent No. 4195, a manhole is used. In this technology, a branch connection box for a communication cable consisting of an inner cover and an outer cover is attached to the manhole cover of a manhole whose opening is reduced using a sloping wall tube at the top, and a branch connection machine is installed in the branch connection box. This is a structure in which a communication cable winding drum is housed.

[0005]

However, the above-mentioned known technique has an advantage that the existing sewer manhole can be used as it is and a branch connection box for a communication cable can be attached to the lid of the sewer manhole. ing.
Further, this known technique has a structure in which an upper sloping wall tube in which an upper portion forming a neck portion of a manhole gradually becomes smaller in diameter is left as it is.

Further, in connection work of a communication cable and work of branching a branch / branch cable from a communication main line cable, a branch connection box of a communication cable attached to a manhole cover is removed from the manhole cover, and the communication wire wound around the drum. This is a structure that can be implemented after the cable is pulled out of the manhole while being pulled out.

The method for rebuilding an existing manhole and the communication cable compatible manhole according to the present invention are completely new technologies developed in view of the above-mentioned various conventional structures.
It relates to the renovation method of existing manholes to easily remodel existing manholes into communication cable compatible manholes and the structure of communication cable compatible manholes.
In particular, the inside diameter of the upper portion of the communication cable compatible manhole can be increased to increase the working space above the communication cable compatible manhole, and the communication cable branch box can be attached and fixed to the upper inner periphery of the communication cable compatible manhole. An object of the present invention is to provide a method for rebuilding an existing manhole and a technique for a communication cable compatible manhole.

[0008]

SUMMARY OF THE INVENTION A method for remodeling an existing manhole and a communication cable compatible manhole according to the present invention are a technique which fundamentally improves the above-mentioned conventional problems, and a gist of the first invention. In the rehabilitation method of the existing manhole, which replaces the existing manhole with a communication cable compatible manhole, the sloped sloping wall pipe, the adjustment ring and the lid receiving frame that form the upper wall of the existing manhole are removed, and the existing manhole is removed. It is characterized in that a manhole for communication cable is constructed by sequentially laminating and fixing an upper straight wall pipe, an adjusting ring and a lid receiving frame having substantially the same inner diameter as the straight wall pipe forming the body, on the straight wall pipe forming the trunk. This is the method of renovating the existing manhole.

According to the above configuration, the existing manhole can be easily remodeled into a communication cable compatible manhole at a low cost. In addition, since an upper straight wall pipe or the like having substantially the same inner diameter as the body straight wall pipe of the body of the existing manhole is incorporated and laminated on the body of the existing manhole, the upper part and the opening of the communication cable compatible manhole are stacked. The inside diameter can be increased and the working space can be increased.

In the reconstructed communication cable manhole, a communication cable branch box can be attached to the inner circumference of the upper straight wall pipe, and connection, branching, repair and inspection work of the communication cable can be performed as it is. Is possible.

[0011] The gist of the second invention according to the present invention is that the same as the skeleton straight wall pipe and the upper straight wall pipe is provided between the skeleton straight wall pipe forming the body of the existing manhole and the upper straight wall pipe. A method of renovating an existing manhole according to the first invention, characterized in that a manhole for communication cables is constructed with a second straight wall pipe having an inner diameter of.

According to the above configuration, the second straight wall pipe is interposed between the skeleton straight wall pipe and the upper straight wall pipe, so that a lighter upper straight wall pipe having a small height can be used. .

The gist of a third invention according to the present invention is to provide a communication cable compatible manhole capable of branching or connecting a communication cable laid in an underground network, wherein an upper portion of the communication cable compatible manhole is provided. It is formed of an enlarged upper straight wall pipe having an inner diameter larger than the lower inner diameter of the communication cable compatible manhole, and a communication cable branch box is fixedly mounted on the inner periphery of the enlarged diameter upper straight wall pipe. It is a communication cable compatible manhole.

According to the above construction, the upper portion of the communication cable compatible manhole is formed by the enlarged upper straight wall pipe having an inner diameter larger than the lower inner diameter of the communication cable compatible manhole. The inner diameter of the upper part and the opening can be further enlarged, and the working space can be further enlarged.

A gist of a fourth invention according to the present invention is the communication according to the third invention, characterized in that the enlarged-diameter upper straight-wall tube is rotatable with respect to a lower portion of the communication cable-compatible manhole. It is a cable-compatible manhole.

According to the above configuration, the enlarged-diameter upper straight-wall pipe can be rotated and disposed in a desired direction with respect to the lower portion of the communication cable-compatible manhole, and can be disposed on the inner periphery of the enlarged-diameter upper straight-wall pipe. The degree of freedom in the arrangement direction of the installed communication cable branch box is increased, and workability is improved.

The gist of a fifth invention according to the present invention is that the enlarged-diameter upper straight-wall pipe is laminated on an upper part of a branch pipe-compatible floor slab that is configured to be rotatable with respect to a lower part of the communication cable-compatible manhole. Fixed, drilling holes in a plurality of predetermined directions at a predetermined position of the branch pipe corresponding floor slab to draw out the branch branch cable to the outside of the communication cable compatible manhole, and
A fourth aspect of the present invention is a communication cable compatible manhole, wherein a thin wall surface is formed on an outer surface of the hole.

According to the above construction, the floor slab corresponding to the branch pipe is rotated and arranged in the desired direction in accordance with the desired branch branch cable pull-out direction, and the desired wall surface of the thin structure is broken and branched. The branch cable can be drawn out of the communication cable compatible manhole, and the branch branch cable has a large degree of freedom in the drawing direction, which is preferable.

The gist of the sixth invention according to the present invention is to provide a method of reconstructing an existing manhole into a communication cable compatible manhole, wherein the inclined mandrel forms an upper wall of the existing manhole. Remove the upper straight wall pipe, the adjustment ring and the lid receiving frame having substantially the same inner diameter as the pipe or the straight wall pipe forming the trunk of the existing manhole, and place the pipe on the straight wall pipe forming the trunk of the existing manhole. This is a method of rebuilding an existing manhole, characterized in that a manhole with a communication cable is constructed by sequentially laminating and fixing an expanded upper straight wall tube having an inner diameter larger than the body straight wall tube, an adjustment ring, and a lid receiving frame. .

According to the above construction, the existing manhole is remodeled with a simple operation and at a low cost, to a communication cable compatible manhole formed by an enlarged upper straight wall pipe having a large inner diameter of the upper part of the manhole and the opening. You can do it.

The gist of a seventh invention according to the present invention is a method of rebuilding an existing manhole into a communication cable compatible manhole, the method comprising the steps of: The upper small-diameter manhole that forms the upper wall laminated via the floor slab that closes the opening of the enlarged manhole, the adjustment ring, and the lid receiving frame are removed, and the inner diameter of the existing slab is reduced on the existing slab. This is a method of rebuilding an existing manhole, characterized by constructing a manhole with a communication cable by stacking and fixing a floor slab for a branch pipe with a large inner diameter, an expanded upper straight wall pipe, an adjustment ring, and a lid receiving frame in order. .

According to the above-mentioned structure, an existing manhole having an upper small-diameter manhole that forms an upper wall laminated above a conventional lower-diameter manhole through a floor slab that closes an opening of the lower-diameter manhole. Can be easily and inexpensively remodeled into a communication cable-compatible manhole formed by an enlarged upper straight wall pipe having a large inner diameter at the upper part of the manhole and at the opening.

[0023]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (A) to FIG. 1 (D) show an embodiment of a method for rebuilding an existing manhole and a communication cable compatible manhole according to the present invention.
FIG. 2 is an explanatory longitudinal sectional view showing the steps of a first embodiment of the method for rebuilding an existing manhole according to the present invention, and FIG. 2 is an upper straight wall type renovated by the first embodiment of the method for rebuilding an existing manhole according to the present invention. FIGS. 3 to 5 are views for explaining a second embodiment of a method for remodeling an existing manhole according to the present invention, and FIG. FIG. 4 is an explanatory longitudinal sectional view showing the configuration of a manhole, FIG. 4 is an explanatory longitudinal sectional view showing the configuration of an upper-diameter, straight-wall type communication cable-compatible manhole according to the present invention obtained by renovating the existing manhole of FIG. 3, and FIG. FIG. 6 is a plan view showing a configuration of a manhole for a communication cable of an upper-diameter straight-wall type shown in FIG. 6, and FIG. 6 and FIG. 7 are views for explaining a third embodiment of a method for remodeling an existing manhole according to the present invention. ,
FIG. 6 is an explanatory longitudinal sectional view showing the structure of an existing manhole in which an upper small-diameter manhole is formed above a lower enlarged manhole via a floor slab, and FIG. 7 is an upper-diameter straight line according to the present invention in which the existing manhole of FIG. It is a longitudinal section explanatory view showing composition of a wall type communication cable compatible manhole.

First, a first embodiment of a method for rebuilding an existing manhole according to the present invention will be described with reference to FIGS. In FIG. 1, FIG. 1 (A) is an explanatory longitudinal sectional view showing a configuration of an existing manhole 1 'in which an upper wall is formed by a sloped inclined wall tube, and FIG. 1 (D) is FIG. 1 (A). FIG. 4 is an explanatory longitudinal sectional view showing a state in which an existing manhole 1 ′ has been reconstructed into a communication cable compatible manhole 1. FIG.
1 (B) and FIG. 1 (C) show the existing manhole 1 ′ of FIG. 1 (A) to the communication cable compatible manhole 1 of FIG. 1 (D).
It is a longitudinal sectional explanatory view which shows the process of renovation construction in order.

The existing manhole 1 'to be reconstructed and constructed on the communication cable-compatible manhole 1 according to the present invention may be installed in an underground road network such as a water and sewage pipe network, an underground communication network, an underground common channel network or a main pipe (main line). ) And a branch pipe (branch line).

In FIG. 1A, the existing manhole 1 'is shown.
Is to dig deep in the ground and lay the chestnut stone 2 on which the bottom plate 3 is installed, and on this bottom plate 3, the first straight wall tube 4 and the second straight wall tube having the same inner diameter as the body straight wall tube. A wall pipe 5 is laminated, and an inclined swash wall pipe 6 that forms the upper wall of the existing manhole 1 ′ is laminated on the second straight wall pipe 5. The first adjusting ring 7 ', the second adjusting ring 8', and the lid receiving frame 9 'each having a diameter are laminated on each other.

Horizontal pipes 10 and 11 are connected to both side walls of the first straight wall pipe 4, respectively. In the case of a sewer pipe network, the inflow pipe and the outflow pipe of sewage are connected to the horizontal pipes 10 and 11, respectively. Can be used as A plurality of steps 12 are attached to the inner peripheral wall of the existing manhole 1 '.

As shown in FIG. 1A, the inclined swash wall tube 6 forming the upper wall of the existing manhole 1 'is configured so that the inner diameter gradually decreases toward the opening of the existing manhole 1'. In order to use this structure as a communication cable-compatible manhole 1, it is not possible to secure a sufficient working space for connecting, branching, repairing, and inspecting the laid communication cable. Therefore, as shown in FIG. In addition, the first and second straight wall pipes 4 and 5 which are the body straight wall pipes forming the body of the existing manhole 1 'have substantially the same inner diameter as the first and second straight wall pipes 4 and 5. If the third straight wall tube 13 and the upper straight wall tube 14 are laminated and fixed to construct the communication cable compatible manhole 1, it is preferable because the working space of the opening is widened.

The method of rebuilding the existing manhole 1 'shown in FIG. 1A to the communication cable-compatible manhole 1 shown in FIG. 1D is as follows. First, as shown in FIG.
(A) The lid receiving frame 9 ', the second adjusting ring 8', the first adjusting ring 7 'and the inclined swash wall tube 6 forming the upper wall of the existing manhole 1' are sequentially removed.

Next, as shown in FIG. 1 (C), on the second straight wall pipe 5 which is the body straight wall pipe forming the body of the existing manhole 1 ', the second straight wall pipe 5 is substantially the same. The third straight wall tube 13, the upper straight wall tube 14, the first adjusting ring 7, the second adjusting ring 8, and the lid receiving frame 9 having the inner diameters of are sequentially laminated and fixed.

Steps 12 are attached to predetermined positions of the third straight wall tube 13 and the upper straight wall tube 14. At this time, a hole 5a is formed at a predetermined position of the second straight wall pipe 5 for drawing out a branch branch cable described later to the outside of the communication cable compatible manhole 1.

The upper straight wall pipe 14 is formed to have a thickness larger than the thickness of the first straight wall pipe 4, the second straight wall pipe 5, and the third straight wall pipe 13, thereby forming a communication cable. The strength of the neck portion of the corresponding type manhole 1 can be increased, and the thickness of the first straight wall tube 4, the second straight wall tube 5, the third straight wall tube 13 and the like stacked thereunder may be thin. . Further, the iron cover of the communication cable compatible manhole 1 can be stably supported.

In the above configuration, the inner diameter of the communication cable compatible manhole 1 has the same inner diameter at the upper and lower portions, thereby connecting and branching a communication cable which will be described later.
Work space for repair and inspection can be sufficiently secured.

A second straight wall pipe 5 serving as a body straight wall pipe;
By interposing the third straight wall pipe 13 between the upper straight wall pipe 14 and the third straight wall pipe 13, a lighter upper straight wall pipe 14 having a relatively small height can be used, and the workability at the time of remodeling work is good.

Next, as shown in FIG. 1 (D) and FIG.
A communication cable branch box (connection box) 15 is attached and fixed to the inner circumference of the upper straight wall pipe 14 via bolts or the like (not shown). The communication cable branch box 15 is provided with horizontal conduits 10 and 11.
The communication main line cable 16 laid in the communication cable-corresponding manhole 1 is drawn up to form a predetermined loop and is started up, and is connected to the inside of the communication cable branch box 15 or is connected to the communication cable branch box 15. The main line cable 16 is configured to be branched into the branch and branch cable 17.

In the figure, reference numeral 18 denotes a sheath tube, which is a branch branch cable.
17 is guided to the outside of the communication cable compatible manhole 1 through a hole 5a provided in the wall surface of the second straight wall pipe 5 of the communication cable compatible manhole 1, and when it is drawn into each house, the branch branch line is used. It serves to cover and protect the cable 17.

The two communication main cables 16 and the branch branch cables 17 connected to the communication cable branch box 15
Form loops each having a predetermined diameter below the communication cable branch box 15, respectively. This allows
The communication main line cable 16 and the branch branch cable 17 can be aligned and inserted into the communication cable compatible manhole 1 from below the communication cable branch box 15, and the communication cable removed from the inner periphery of the upper straight wall pipe 14. It is configured such that the branch box 15 for use can be drawn out of the manhole 1 corresponding to the communication cable.

In the communication cable compatible manhole 1 configured as described above, the inner diameter of the upper straight wall pipe 14 forming the upper part thereof is changed to the lower inner diameter of the communication cable compatible manhole 1 (for example, the body straight wall pipe). First and second straight wall tubes 4
5 and the inner diameter of the third straight wall tube 13), the space above the communication cable compatible manhole 1 can be made large.

Therefore, the communication cable branch box 15 fixed to the upper straight wall pipe 14 is left as it is, and the communication main line cable 16 is connected thereto, or the branch branch cable 17 is branched. , And other repairs,
A relatively large work space for inspection can be secured, and workability is improved.

The communication cable branch box 15 fixed to the upper straight wall pipe 14 uses the loop of the communication main line cable 16 and the branch branch cable 17 as described above, and the communication cable compatible manhole 1 is used. It can be easily pulled out from the opening of the communication cable.
6. Connection, branch or other repair or inspection of the branch branch cable 17 can be performed, and workability is improved.

Further, the inclined wall 6 forming the upper wall of the conventional existing manhole 1 ', the first and second adjusting rings 7' and 8 ', and the lid receiving frame 9' are removed, and the third straight wall is removed. Pipe 13, upper straight wall pipe 14, first and second adjustment rings 7, 8 and lid receiving frame 9
Can be constructed simply by sequentially laminating and fixing the manhole 1 for communication cables, the existing manhole 1 'can be remodeled into the manhole 1 for communication cables with a simple operation and at low cost, which is economically advantageous. is there.

Further, the third straight wall pipe 13 is interposed between the first and second straight wall pipes 4 and 5 serving as the body straight wall pipes and the upper straight wall pipe 14, so that a relatively high height can be obtained. Small lightweight upper straight wall tube
14 can be used, and the work when the existing manhole 1 'is remodeled into the communication cable compatible manhole 1 becomes easy.

Next, a description will be given of a second embodiment of a method for remodeling a communication cable compatible manhole and an existing manhole according to the present invention with reference to FIGS. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

The existing manhole 21 'shown in FIG. 3 is a small-diameter manhole having an inner diameter of, for example, about 600 mm, as in the case of the first embodiment. And the like, or at a branch point between a main pipe (main line) and a branch pipe (branch line).

As in the case of the first embodiment, the existing manhole 21 ′ is dug deep in the ground, lays the chestnut stone 2, and the base plate 3 is installed thereon. ′, A first straight wall pipe 4 and a second straight wall pipe 5 having the same inner diameter as the straight wall pipe forming the body of the body ′ are laminated, and the existing manhole is placed on the upper part of the second straight wall pipe 5. The upper and lower walls 21 'are formed, and the third and fourth straight wall pipes 22, 23 are upper straight wall pipes having the same inner diameter as the first straight wall pipe 4 and the second straight wall pipe 5.
And an adjusting ring 7 ′ is provided on the upper part of the fourth straight wall tube 23.
And the lid receiving frame 9 'are respectively laminated, and the other configuration is the same as that of the first embodiment.

When retrofitting the existing manhole 21 'shown in FIG. 3 to the communication cable compatible manhole 21 shown in FIGS. 4 and 5, first, the lid receiving frame 9', the adjusting ring 7 'and the After sequentially removing the fourth straight wall pipe 23 and the third straight wall pipe 22, as shown in FIG. 4, a branch pipe corresponding floor slab 24 is laminated on the upper part of the second straight wall pipe 5, The third straight wall tube 25, the upper straight wall tube 26, which is an enlarged upper straight wall tube having an inner diameter larger than that of the inner ring 5 and having the same inner diameter, and an adjustment ring 7 having the same inner diameter as these. Then, the lid receiving frames 9 are sequentially laminated and fixed to construct the communication cable compatible manhole 21.

Here, the inside diameters of the first and second straight wall pipes 4 and 5 which are the body straight wall pipes forming the body of the existing manhole 21 'are, for example, small diameters of about 600 mm. The inner diameters of the branch pipe corresponding floor slab 24, the third straight wall pipe 25, the upper straight wall pipe 26, the adjusting ring 7, and the lid receiving frame 9 serving as the upper straight wall pipe are, for example,
It is formed with an expanded large diameter of about 900 mm.

The floor slab 24 corresponding to the branch pipe serving as the enlarged-diameter upper straight-wall pipe is provided rotatably with respect to the second straight-wall pipe 5 serving as the skeleton straight-wall pipe forming the body of the existing manhole 21 '. Have been.

At a predetermined position of the branch pipe-compatible floor slab 24,
In a plurality of predetermined directions, a hole 24a for drawing out the branch branch cable 17 to the outside of the communication cable compatible manhole 21 is formed, and a thin-walled wall is formed on the outer surface of the hole 24a.
24b are formed.

Then, the branch pipe corresponding floor slab 24 is rotated with respect to the second straight wall pipe 5 in accordance with a desired pull-out direction of the branch branch cable 17, and is arranged in a desired direction. A sheath tube 18 that breaks a desired wall surface 24b and covers the branch branch cable 17 can be fitted and attached to the branch tube corresponding floor slab 24.

As described above, the floor slab 24 corresponding to the branch pipe serving as the enlarged-diameter upper straight-wall pipe can be rotated with respect to the second straight-wall pipe 5 serving as the skeleton straight-wall pipe forming the body of the existing manhole 21 '. If provided, the branch pipe corresponding floor slab 24 can be rotated to arrange the communication cable branch box 15 attached to the inner periphery of the upper straight wall pipe 26 at a desired position, and further, When a thin wall portion is provided on the peripheral wall of the branch pipe corresponding floor slab 24, the sheath tube 18 of the branch branch cable 17 can be easily inserted and taken out.

The upper straight wall tube 26 is formed to have a thickness greater than the thickness of the third straight wall tube 25, thereby increasing the strength of the neck of the communication cable compatible manhole 21. And a third straight wall tube laminated beneath it
The thickness of the 25 may be thin. Further, the iron cover of the communication cable compatible manhole 21 can be stably supported.

Further, since the upper straight wall pipe 26 has a large thickness, a recess 26a having a relatively large depth can be formed in the inner peripheral wall thereof, and a branch box for a communication cable is provided in the recess 26a. 15 can be stored and fixed in a stable state. Other configurations are the same as those of the first embodiment, and similar effects can be obtained.

In this embodiment, as shown in FIG. 3, an existing manhole 21 'composed of a small-diameter straight-wall pipe having the same diameter in the vertical direction is used.
An example in which the manhole 21 was remodeled to the upper-diameter straight-wall type communication cable-compatible manhole 21 as shown in FIG. 4 is shown, but as shown in FIG. In the existing manhole 1 ', after removing the inclined swash wall pipe 6, the first and second adjustment rings 7' and 8 ', and the lid receiving frame 9', a branching to become the expanded upper straight wall pipe shown in FIG. Pipe-compatible floor slab 2
4. The communication cable compatible manhole 21 may be constructed by sequentially laminating and fixing the third straight wall pipe 25, the upper straight wall pipe 26, the adjustment ring 7, and the lid receiving frame 9.

According to the above configuration, the upper part of the communication cable-compatible manhole 21 is placed above the communication cable-compatible manhole 21.
The inner diameter of the upper portion and the opening of the communication cable compatible manhole 21 is further increased by being formed with the enlarged upper straight wall pipe having an inner diameter larger than the lower inner diameter of The communication cable branch box 15 is left as it is, and the communication main line cable 16 is connected to this, or the branch branch cable 17 is branched, and the work space for other repairs and inspections is further increased. As a result, the workability can be further improved.

The communication cable branch box 15 mounted and fixed to the upper straight wall pipe 26 utilizes the loop of the communication main line cable 16 and the branch branch cable 17 in the same manner as in the first embodiment. Since it can be easily pulled out from the opening of the cable-compatible manhole 21, even outside the communication cable-compatible manhole 21, connection or branching of the main communication cable 16 and branch / branch cable 17 or other repairs , Inspection can be performed and workability is improved.

Further, the existing manhole 2 shown in FIG.
The third straight wall pipe 22, the fourth straight wall pipe 23, the adjusting ring 7 'and the lid receiving frame 9', which are the upper straight wall pipes of 1 ', or FIG.
The sloping inclined pipe 6 forming the upper wall of the existing manhole 1 ', the first and second adjusting rings 7' and 8 ', and the lid receiving frame 9' shown in FIG. Third straight wall pipe 25,
Only by sequentially laminating and fixing the upper straight wall pipe 26, the adjusting ring 7, and the lid receiving frame 9, it is possible to construct the communication cable compatible manhole 21 formed by the enlarged upper straight wall pipe having a large inner diameter of the upper part and the opening. The existing manholes 1 ', 21' can be reconstructed into a communication cable compatible manhole 21 with a simple operation and at low cost, which is economically advantageous.

Next, a third embodiment of a method for rebuilding a communication cable compatible manhole and an existing manhole according to the present invention will be described with reference to FIGS. The same components as those in the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted.

The existing manhole 31 'shown in FIG. 6 is a large-sized manhole (a manhole of 4 or more in the industry) with an enlarged lower portion, and the existing manhole 31' is the same as that of the first and second embodiments. As in the example, the bottom slab 3 is set on the ground stone digging deeply and laying the chestnut stone 2, and on the bottom slab 3,
For example, a lower enlarged manhole portion 32 having an inner diameter of 2,000 mm or more is provided, and a floor slab 33 for closing the opening is provided at the upper end of the lower enlarged manhole portion 32.

Further, on the floor slab 33, first and second straight wall pipes 34 and 35 and upper straight wall pipe 36 which are upper small diameter manholes having an inner diameter of, for example, 600 mm are laminated.
First and second adjusting rings 7 ', 8' and a lid receiving frame 9 'are sequentially laminated on the upper portion of the upper portion 36, and the water and sewage pipe network, the underground communication network, as in the first and second embodiments. , In the middle of an underground road network such as an underground common trench network, or at a branch point between a main pipe (main line) and a branch pipe (branch line).

Horizontal pipes 10 and 11 are connected to both side walls of the lower enlarged manhole 32, respectively. In the case of a sewer pipe network, an inflow pipe and an outflow pipe of sewage are respectively connected to a horizontal pipe.
Can be used as 10 and 11. Also, a plurality of steps 12 are attached to the inner peripheral wall of the existing manhole 31 '. Other configurations are substantially the same as those of the first and second embodiments.

When retrofitting the existing manhole 31 'shown in FIG. 6 to the communication cable compatible manhole 31 shown in FIG. 7, first, the lid receiving frame 9', the second adjusting ring 8 ', the first Adjusting ring 7 ', upper straight wall tube 36, second straight wall tube
After the 35 and the first straight wall tube 34 are sequentially removed, as shown in FIG. A third straight wall pipe which becomes an expanded upper straight wall pipe having the same inner diameter on the upper part of the corresponding floor slab 24
25, the upper straight wall tube 26, the adjusting ring 7 having the same inner diameter as these, and the lid receiving frame 9 are sequentially laminated and fixed to construct a communication cable compatible manhole 31.

Here, the first and second straight wall pipes 34 and 35 and the upper straight wall pipe 36 and the first and second adjustment rings which are upper small diameter manholes provided above the floor slab 33 of the existing manhole 31 '. When the inside diameters of 7 ', 8' and the lid receiving frame 9 'are small, for example, about 600 mm, the third straight wall pipe 25, which is the upper part of the branch pipe corresponding floor slab 24, the enlarged diameter upper straight wall pipe, and the upper part The inner diameters of the straight wall tube 26, the adjustment ring 7, and the lid receiving frame 9 are formed to have an expanded large diameter of, for example, about 900 mm.

Further, the slab 24 corresponding to the branch pipe serving as the enlarged-diameter upper straight wall pipe is 360 ° with respect to the slab 33 of the existing manhole 31 ′.
It is rotatably provided, and substantially the same effects as in the second embodiment can be obtained.

According to the above configuration, similarly to the second embodiment, the upper portion of the communication cable-compatible manhole 31 is formed by an enlarged-diameter upper straight wall pipe having an inner diameter larger than the inner diameter of the floor slab 33. The inner diameter of the upper portion and the opening of the communication cable compatible manhole 31 is increased, and the communication cable branch box 15 fixed to the upper straight wall pipe 26 is left as it is, and the communication main line cable 16 is connected thereto. A large work space can be secured for connection, branching of the branch and branch cable 17, and other repairs and inspections, thereby improving workability.

The communication cable branch box 15 fixed to the upper straight wall pipe 26 is provided with a communication main line cable 16 and a branch branch cable 17 as in the first and second embodiments.
Using the communication loop, the communication cable compatible manhole 31
It can be easily pulled out from the opening of the
Even outside the communication cable-compatible manhole 31, connection or branching of the communication main line cable 16 and branch branch cable 17 or other repairs and inspections can be performed, thereby improving workability.

Further, the existing manhole 3 shown in FIG.
The first straight wall tube 34, the second straight wall tube 35, the upper straight wall tube 36, and the first and second adjustment rings 7 ', which become the upper small diameter manhole of 1',
8 'and the lid receiving frame 9' are removed, and the branch pipe-compatible floor slab 24,
Third straight wall pipe 25, upper straight wall pipe 26, adjustment ring 7, lid receiving frame 9
By simply laminating and fixing sequentially, a manhole 31 corresponding to a communication cable formed of a large-diameter upper straight wall pipe having a large inner diameter of the upper part and the opening part can be constructed. Communication cable compatible manhole
It can be renovated to 31 and is economically advantageous. Other configurations are the same as those of the first and second embodiments, and the same effects can be obtained.

[0068]

The method for remodeling an existing manhole and the communication cable compatible manhole according to the present invention have the above-described structure and operation, and therefore have the following tremendous effects.

(1) The slanted sloping wall tube, the adjusting ring, and the lid receiving frame forming the upper wall of the existing manhole are removed, and the skeleton straight wall tube is formed on the skeleton straight wall tube forming the body of the existing manhole. By constructing the communication cable compatible manhole by sequentially laminating and fixing the upper straight wall pipe, adjustment ring, and lid receiving frame having the same inner diameter, the existing manhole can be easily replaced with the communication cable compatible manhole at low cost. Can be rebuilt.

(2) In the case where an upper straight wall pipe or the like having an inner diameter substantially the same as that of the body straight wall pipe of the trunk of the existing manhole is assembled and laminated on the trunk of the existing manhole, a communication cable compatible manhole is used. The working space can be widened by increasing the inner diameter of the upper part and the opening of the housing.

(3) In the reconstructed manhole for communication cable, a branch box for communication cable can be attached to the inner circumference of the upper straight wall pipe, and connection, branching, repair and inspection of the communication cable as it is. Work is possible.

(4) Since the second straight wall pipe is interposed between the main body straight wall pipe and the upper straight wall pipe, a lighter upper straight wall pipe having a small height can be used. The workability when renovating an existing manhole to a communication cable compatible manhole can be improved.

(5) The upper part of the communication cable compatible manhole is formed by an enlarged upper straight wall pipe having an inner diameter larger than the lower inner diameter of the communication cable compatible manhole. If a communication cable branch box is fixed around the circumference, the inside diameter of the upper part and the opening of the communication cable compatible manhole should be further enlarged, and the space for connection, branching, repair, and inspection of the communication cable should be further expanded. I can do it.

(6) When the enlarged-diameter upper straight-wall pipe is configured to be rotatable with respect to the lower part of the communication cable-compatible manhole, the expanded-diameter upper straight-wall pipe is positioned below the communication cable-compatible manhole. The communication cable branch box attached to the inner periphery of the enlarged-diameter upper straight-wall pipe has a greater degree of freedom in the arrangement direction, and the workability is improved.

(7) The enlarged-diameter upper straight-wall pipe is laminated and fixed on the upper part of the branch pipe-compatible floor slab which is rotatable with respect to the lower part of the communication cable-compatible manhole. In the case where holes for pulling out the branch branch cable to the outside of the communication cable compatible manhole at a predetermined position are drilled in a plurality of predetermined directions, and a thin wall surface is formed on the outer surface of the hole, In accordance with the desired branch branch cable pull-out direction, the branch pipe corresponding floor slab is rotated and arranged in a desired direction, and the desired wall surface of the thin structure is broken to break the branch branch cable into a communication cable compatible manhole. It can be pulled out to the outside, and the branch branch cable has a large degree of freedom in the drawing direction, which is preferable.

(8) An upper straight wall pipe, an adjusting ring, and a lid receiving frame having substantially the same inner diameter as the inclined wall pipe forming the upper wall of the existing manhole or the straight wall pipe forming the body of the existing manhole. Removed, on top of the skeleton straight wall tube forming the trunk of the existing manhole, laminated and fixed in order the enlarged diameter upper straight wall tube with an inner diameter larger than the skeleton straight wall tube, the adjustment ring, and the lid receiving frame to support communication cables When a manhole is constructed, the existing manhole can be easily and inexpensively reconstructed into a communication cable compatible manhole formed by an expanded upper straight wall pipe with a large inside diameter at the top of the manhole and at the opening. You can do it.

(9) An upper small-diameter manhole, an adjusting ring, and a lid receiving frame that form an upper wall laminated on a floor slab that closes an opening of the lower-diameter manhole above the lower-diameter manhole of the existing manhole. Removed, and on the floor of the existing manhole, a floor slab corresponding to a branch pipe having an inner diameter larger than the inner diameter of the floor slab, an enlarged diameter upper straight wall pipe, an adjustment ring, and a lid receiving frame are sequentially laminated and fixed to support a communication cable. When a mold manhole is constructed, an existing manhole having an upper small-diameter manhole that forms an upper wall laminated on a floor slab that closes an opening of the lower enlarged manhole above a conventional lower-diameter manhole. Can be easily and inexpensively remodeled into a communication cable-compatible manhole formed by an enlarged upper straight wall pipe having a large inner diameter at the upper part of the manhole and at the opening.

(10) By increasing the upper space and opening of the communication cable compatible manhole, machines and equipment for repair and inspection can be easily carried into the communication cable compatible manhole, and communication can be performed. The odor and harmful gas in the cable-compatible manhole can be released to the outside in a short time.

(11) Since the communication cable branch box is attached to the upper inner periphery of the communication cable compatible manhole, the communication cable branch box is easily taken out of the communication cable compatible manhole opening and connected. The branching, repair, inspection and the like can be performed outside of the communication cable compatible manhole in a stable state.

[Brief description of the drawings]

1 (A) to 1 (D) are longitudinal sectional views showing steps of a first embodiment of a method for rebuilding an existing manhole according to the present invention.

FIG. 2 is a plan view of an upper straight wall type communication cable compatible manhole renovated according to the first embodiment of the method for renovating an existing manhole according to the present invention.

FIG. 3 is an explanatory longitudinal sectional view showing a configuration of an existing manhole of an upper straight wall type.

FIG. 4 is an explanatory longitudinal sectional view showing a configuration of an upper-diameter straight-wall type communication cable compatible type manhole according to the present invention obtained by renovating the existing manhole of FIG. 3;

FIG. 5 is a plan view showing a configuration of a manhole corresponding to a communication cable of an upper diameter enlarged straight wall type shown in FIG. 4;

FIG. 6 is an explanatory longitudinal sectional view showing a configuration of an existing manhole in which an upper small-diameter manhole is formed above a lower enlarged manhole via a floor slab.

7 is an explanatory longitudinal sectional view showing a configuration of an upper diameter enlarged straight wall type communication cable compatible manhole according to the present invention obtained by renovating the existing manhole of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Manhole for communication cable 1 '... Existing manhole 2 ... Kuriishi 3 ... Bottom plate 4 ... 1st straight wall pipe 5 ... 2nd straight wall pipe 5a ... Hole 6 ... Inclined inclined wall pipe 7, 7' ... 1st adjustment Ring 8, 8 '... second adjustment ring 9, 9' ... lid receiving frame 10, 11 ... horizontal pipeline 12 ... step 13 ... third straight wall pipe 14 ... upper straight wall pipe 15 ... communication cable branch box 16 ... communication Main cable 17 ... Branch cable 18 ... Sheath tube 21 ... Manhole for communication cable 21 '... Existing manhole 22 ... Third straight wall tube 23 ... Fourth straight wall tube 24 ... Floor plate for branch tube 24a ... Hole 24b ... Wall surface 25 ... third straight wall pipe 26 ... upper straight wall pipe 26a ... recess 31 ... communication cable compatible manhole 31 '... existing manhole 32 ... lower diameter enlarged manhole part 33 ... floor slab 34 ... first straight wall pipe 35 ... 2 straight wall pipe 36 ... top straight wall pipe

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akira Nobunaga 1-22-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Haneda Hume Kanko Co., Ltd. (72) Inventor Kuniyuki Ichikawa 1-22 Nishi-Shinjuku, Shinjuku-ku, Tokyo No. 2 Haneda Hume Tube Co., Ltd.

Claims (7)

[Claims] 1. A method of rebuilding an existing manhole into a communication cable compatible manhole, the method comprising the steps of: removing an inclined sloping wall pipe, an adjusting ring, and a lid receiving frame that form an upper wall of the existing manhole; A manhole for communication cable is constructed by sequentially laminating and fixing an upper straight wall tube having an inner diameter substantially the same as that of the skeleton straight wall tube, an adjusting ring, and a lid receiving frame on the skeleton straight wall tube forming the trunk portion of the existing manhole. A method of renovating existing manholes, characterized by the following: 2. A second straight wall having substantially the same inner diameter as the skeleton straight wall pipe and the upper straight wall pipe between the skeleton straight wall pipe and the upper straight wall pipe forming the body of the existing manhole. The method for renovating an existing manhole according to claim 1, wherein the manhole for communication cable is constructed via a pipe. 3. A communication cable compatible manhole capable of branching or connecting a communication cable laid in an underground road network, wherein an upper portion of the communication cable compatible manhole is larger than a lower inner diameter of the communication cable compatible manhole. A manhole for a communication cable, wherein the manhole is formed by an expanded upper straight wall pipe having an inner diameter, and a communication cable branch box is fixedly mounted on an inner periphery of the expanded upper straight wall pipe. 4. The communication cable compatible manhole according to claim 3, wherein the enlarged diameter upper straight wall pipe is configured to be rotatable with respect to a lower portion of the communication cable compatible manhole. 5. The enlarged-diameter upper straight-wall pipe is laminated and fixed on an upper part of a branch pipe-compatible floor slab which is rotatable with respect to a lower part of the communication cable-compatible manhole. A hole for pulling out the branch branch cable to the outside of the communication cable compatible manhole at a position is formed in a plurality of predetermined directions, and a thin wall surface is formed on the outer surface of the hole. A communication cable compatible manhole according to claim 4. 6. A method for reconstructing an existing manhole into a communication cable compatible manhole, the method comprising the steps of: rebuilding an existing manhole; and forming a slanted inclined wall tube forming an upper wall of the existing manhole or a body forming a trunk of the existing manhole. Removed the upper straight wall pipe, the adjustment ring and the lid receiving frame, which have substantially the same inner diameter as the straight wall pipe, and had a larger inner diameter than the skeleton straight wall pipe on the skeleton straight wall pipe forming the trunk of the existing manhole A method for rebuilding an existing manhole, characterized in that a manhole with a communication cable is constructed by sequentially stacking and fixing an enlarged-diameter upper straight wall pipe, an adjustment ring, and a lid receiving frame. 7. A method of rebuilding an existing manhole into a communication cable-compatible manhole, the floor slab closing an opening of the lower enlarged manhole above a lower enlarged manhole of the existing manhole. Removing the upper small-diameter manhole forming the upper wall laminated through, the adjustment ring and the lid receiving frame, and forming a branch pipe corresponding slab having an inner diameter larger than the inner diameter of the slab on the slab of the existing manhole; A method for rebuilding an existing manhole, characterized in that a manhole with a communication cable is constructed by sequentially stacking and fixing an enlarged-diameter upper straight wall pipe, an adjustment ring, and a lid receiving frame.