JP2001011877A - Expansion method for manhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manhole expansion method capable of easily conducting even in a place in which opencut construction is difficult by using non-opencut method, easily resolving possession problem of a road and a noise problem on the ground, and attaining the reduction of a work cost and the shortness of a construction period. SOLUTION: A jacking device 6 is installed toward an expansion direction to assemble a cylindrical steel box 10 by equipment and materials carried in from a manhole neck part 4 in the inside of a manhole 3, the steel box 10 is provided on the jacking device 6 by directing the opening part of the steel box 10 in the expansion direction, and a manhole wall in the expansion direction is dismantled before or after the jacking device is installed and the steel box 10 is assembled. The inside of the steel box is excavated while the steel box 10 is jacked by the jacking device, after prescribed length is excavated, a bar arrangement is executed in an excavated hole part, a form is attached, concrete is placed in the form, and thereafter the form is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for expanding a manhole, and more particularly, to a method for connecting a manhole to a pipe, for example, an existing lead sheath.
The present invention relates to a method for extending a predetermined length when replacing an F cable with a CV cable or arranging a new cable.

[0002]

2. Description of the Related Art Conventionally, lead-covered OF cables (oil-immersed insulated paper cables) have been widely used as underground power transmission lines, but in recent years, CV cables having many advantages over the lead-covered OF cables have been recently used. (Cross-linked polyethylene insulated cable)
Is being replaced by This CV cable does not require an oil supply device, and thus has the advantage that no oil leakage occurs and the construction cost is low. In addition, no metal coating is required, and construction and maintenance are easy, which is profitable. Further, since the use temperature can be set high, the power transmission capacity is large. However, since the CV cable is lightweight and has low rigidity, it has a drawback that the cable has a large extension and a manhole for accommodating the cable is large. For example, while a manhole containing an OF cable is about 6 m long, a manhole having a length of about 7.5 m is needed to store a CV cable. Therefore, in order to replace the existing OF cable with a CV cable, it was necessary to extend the manhole by a predetermined length. In addition, it is often necessary to expand the space in the manhole not only for such replacement work but also for storing or installing various cables and devices. Therefore, conventionally, as shown in FIG. 27, an excavation method is used in which a hole is excavated along the one side wall surface of the existing manhole (26) from the ground to an area indicated by a dashed line, and a manhole extension part indicated by a broken line is constructed. It had been.

[0003]

However, the above-mentioned manhole expanding method by digging has the following various problems. That is, it cannot be constructed on a newly-paved excavation-regulated road, and it requires a large amount of cost. In addition, the construction days are long, the area occupied by the road during the construction is large, and the underground construction sound reaches the ground through the excavation hole, causing many troubles to the roadside residents and the passing vehicles. In addition, when a sewer pipe, a water pipe, or a gas pipe is present around the manhole, it is difficult to use this excavation method. The present invention has been made in view of such circumstances, by using a non-cutting method,
It can be easily constructed even in places where digging work is difficult, and at the same time, road occupation problems and noise problems on the ground can be eliminated at once, and construction costs can be reduced and the construction period can be shortened. The purpose is to provide a manhole expansion method.

[0004]

According to the first aspect of the present invention,
This is a method of extending the manhole by a predetermined length in the longitudinal direction.In the manhole, a propulsion device is installed in the direction of extension and a cylindrical steel box is assembled with equipment brought in from the neck of the manhole. Box
The opening of the steel box is arranged on the propulsion device with the extension direction, and the manhole wall in the extension direction is broken before or after the installation of the propulsion device and before or after assembling the steel box. After excavating the inside of it while propelling it, excavating a predetermined length, applying reinforcement to this excavated hole and attaching a formwork, placing concrete in this formwork, and then This is a manhole expansion method characterized by removing the formwork.

According to a second aspect of the present invention, there is provided a method of extending a manhole by a predetermined length in a longitudinal direction of the manhole. In the manhole, a propulsion device is installed in a direction of extension by means of equipment brought in from the neck of the manhole. And a cylindrical precast concrete box is assembled, and the precast concrete box is arranged on the propulsion device with the opening of the box facing the extension direction, and the manhole wall in the extension direction is installed and precast with the propulsion device. Before or after assembling the concrete box, the inside of the precast concrete box is excavated while propelling the precast concrete box by the propulsion device, and a front plate is attached to a front end opening of the precast concrete box. It is an expansion method.

According to a third aspect of the present invention, there is provided a method of extending a manhole by a predetermined length in a width direction of the manhole. In the manhole, a propulsion device is installed in a direction of extension by a machine carried in from a neck of the manhole. Assemble a tubular steel box or precast concrete box with
This box is arranged on the propulsion device with the opening of the box facing the extension direction, and the manhole wall in the extension direction is broken before or after installation of the propulsion device and before or after assembly of the box, and the propulsion device The inside of the box is excavated while the box is propelled, and when the box is a steel box, after excavation of a predetermined length, a reinforcement is provided to the excavated hole, and a formwork is attached. This is a method of expanding manholes by placing concrete in the frame and then removing the formwork. By providing these inventions, the above problems are completely solved.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 will be described with reference to the drawings. 1 to 9 show a manhole expanding method according to the present invention in the order of steps.
First, as shown in FIG. 1, a protective member (1) is wound around a cable (not shown) and tightened with a string (2) to protect the cable from being damaged during construction. Then, in order to strengthen the ground by injecting a chemical solution before construction, a hole for injecting a chemical solution is formed in a side wall on an expanding side. This drilling operation is performed manually using a water jet or the like, since the neck (4) of the manhole (3) is about 1 m in diameter and the boring machine cannot be carried into the manhole (3). The rod (5) is inserted into the hole for chemical solution injection thus drilled, and the chemical solution is injected through the rod (5). The chemical used here is appropriately selected according to the soil quality and the state of the groundwater at the extension construction site.

Next, as shown in FIGS. 2 and 3, a material is carried in from the neck portion (4) of the manhole, and a propulsion device (6) is installed in the expanding direction. In this installation work, first, as shown in FIG.
Subsequently, as shown in FIG. 3, the reaction girder (8) is set on the girder receiving part (7) so as to abut on the side wall opposite to the expanding side, and the reaction girder (8) The hydraulic jack (9) serving as a propulsion source is installed on the side of the side to be expanded in (2). Further, the cylindrical steel box (10) is assembled, the steel box (10) is applied to the side wall on the side to be expanded, and the hydraulic jack (9) is set so that the steel box (10) can be propelled.

[0009] The steel box (10) is made of an angle material (not shown).
Is screwed to form a cylindrical frame, a steel plate is stuck around the frame, and fixed with screws to assemble. Before assembly, it is divided into many members,
It can be easily carried in from the neck (4) of the manhole. Further, as shown in FIG. 6, the steel box (10) has a shape having an opening area considerably larger than the cross-sectional area of the existing pipeline (13) so as to face the existing pipeline (13). Is placed on the girder receiving part (7) with the opening facing the extension direction. Two hydraulic jacks (9) are provided as shown in the figure, and are set at the center of gravity of the steel box (10) so that the propulsion force is evenly applied to the entire circumference of the opening of the steel box (10). You.

Before or after the installation of the propulsion device (6) and the assembly of the steel box (10), as shown in FIG. 4, the manhole wall, which is the side wall on the expanding side, is demolished. The steel box (10) is pressed against the bent part. For the work of removing the manhole wall, a tool that can be easily carried in from the manhole neck (4) such as a breaker or a concrete core is used. In addition, since a large amount of dust and dust is generated during the operation, sufficient dust is absorbed by a dust absorber or a blower (neither is shown).

Next, as shown in FIGS. 5 and 6, the steel jack (10) is propelled in the direction shown by the arrow by operating the hydraulic jack (9), and then the inside of the steel box (10) is excavated.
The steel box (10) is propelled while alternately repeating this propulsion and excavation. When the steel box (10) reaches a predetermined position indicated by a one-dot chain line, a filler is injected and filled into the space on the outer periphery of the steel box (10) from the previously opened graft hole. Thereby, the road surface is prevented from being depressed by the gap and the steel box (10) is fixed, and thereafter, as shown in FIG. 7, the temporary material such as the propulsion device (6) is removed to the outside of the manhole (3). Then, as shown in the figure, the reinforcing bars (14) are arranged in the steel box (10), and the formwork (15) is attached. Thereafter, the ready-mixed concrete is supplied into the formwork (15) through the hose (16) from the pump car on the ground, and the concrete is poured. When the ready-mixed concrete is sufficiently hardened, as shown in FIG.
Has been removed and the manhole extension (1)
9) is completed. Then, as shown in FIG.
The V cable (22) is inserted through the manhole extension (19), and all operations are completed.

[0012] The method for expanding a manhole according to claim 1 is as follows.
As described above, since the non-cutting method is employed, the construction can be performed without being restricted by excavation, the area occupied by the road surface can be reduced, and the noise reaching the ground can be reduced. Further, the construction cost can be reduced to about 60% of the conventional manhole expansion method by digging. Further, the number of construction days can be reduced to about １ ／ of the manhole expansion method by digging. In addition, a space for connecting cables and a space for storing and arranging various cables and devices can be sufficiently secured. Further, since the steel box (10) is cylindrical, the vertical component of the earth pressure applied to the upper surface thereof can be made relatively small. Therefore,
When the steel box (10) is propelled, the tip of the steel box (10) does not fall, and the steel box (10) is constructed so as to be horizontal. It has been confirmed by the inventors that this is particularly effective when the length of the manhole extension (19) is 1.0 m or more.

Next, a method for constructing a manhole according to claim 2 will be described. 2. The method according to claim 1, wherein
Is that a precast concrete box (17) as illustrated in FIGS. 10 and 11 (hereinafter referred to as a concrete box (17)) is used instead of the steel box (10). . The method for expanding a manhole according to claim 2 differs from the method for expanding a manhole according to the method according to claim 1 in that a material carrying-in step and a concrete box (17) assembling step are different, and a reinforcing arrangement step, a formwork setting step, and a ready-mixed concrete. There is no casting step, curing step of ready-mixed concrete, and step of removing the formwork, and the other steps are the same as the expansion method according to claim 1.

That is, the neck (4) of the manhole (3)
In the step of loading the material from the container, the component (18) of the concrete box (17) as illustrated in FIGS. 10 and 11 is loaded instead of the component of the steel box (10). The concrete box (17) can be divided in the circumferential direction, and the component (18) to be carried in is the divided member. Therefore, this component (18) can be easily carried in from the neck (4) of the manhole (3).
The concrete box (17) may have a cylindrical shape, but preferably has a cylindrical shape (see FIG. 11). If it is cylindrical, the tip does not fall during propulsion as described above, and the concrete box (1
7) can be constructed to be horizontal.

After the material loading step, the propulsion device (6) is installed in the manhole (3) as shown in FIG.
That is, similarly to the expansion method according to the first aspect, the receiving girder part (7), the reaction force girder part (8), and the hydraulic jack (9) are installed. The components (1) of the concrete box (17)
8) Assemble the concrete box (17) by bolting them together. And hydraulic jack (9)
Is set so that the concrete box (17) can be propelled. Before or after the installation of the propulsion device (6) and the assembly of the concrete box (17), as shown in FIG. 13, the manhole wall, which is the side wall on the expanding side, is demolished. Box (1
7) is pressed.

Next, as shown in FIG. 14, the hydraulic jack (9) is operated to propel the concrete box (17) in an expanding direction, and then the inside of the concrete box (17) is excavated. Are alternately repeated to propel the concrete box (17). When the concrete box (17) is propelled to a predetermined position indicated by a dashed line, as shown in FIG. 15, a front plate (2) made of precast concrete is provided at the front end opening of the concrete box (17).
3) Attach. Then, a filler is injected and filled into the space around the concrete box (17) from the graft hole previously opened, and the temporary material such as the propulsion device (6) is removed to the outside of the manhole (3). Thereby, the manhole extension part (21) made of concrete is completed. And
As shown in FIG. 16, a new CV cable (22) is inserted through the manhole extension (21), and all operations are completed.

The method for expanding a manhole according to claim 2 is as follows:
Since the non-cutting method is used, construction can be performed without any restriction on excavation, the area occupied by the road surface can be reduced, and noise reaching the ground can be reduced. Further, the construction cost can be reduced to about 60% of the conventional manhole expansion method by digging. Further, it is possible to sufficiently secure a space for connecting cables and a space for storing and installing various cables and devices. Furthermore, since the box to be propelled is made of precast concrete, there is no need for the rebar arrangement process, the formwork setting process, the ready-mixed concrete placement process, the ready-mixed concrete curing process, and the removal process of the formwork, greatly shortening the construction period. It can be reduced to about 1 / 1.7 of the manhole expansion method by excavation. Also, construction costs can be significantly reduced.

Next, a method for expanding a manhole according to claim 3 will be described. A different point of the manhole expanding method according to claim 3 from the expanding method according to claim 1 is a direction in which the manhole is expanded. That is, the manhole expanding method according to claim 1 is a method of expanding the manhole in the longitudinal direction, whereas the expanding method according to claim 3 is a method of expanding the manhole in the width direction. This method is mainly used when installing new cables, but when replacing existing cables with new cables, or when storing and storing various cables and equipment.
It may be used when securing an installation space. Less than,
A case where a cable is newly installed will be described as an example. In the expansion method according to claim 3, first, as shown in FIG. 17, in order to strengthen the ground by injecting a chemical, a manhole (3) is used.
A hole for injecting a chemical solution is formed in the side wall in the width direction. Then, the rod (5) is inserted into the drilled hole for injecting the chemical, and the chemical is injected into the ground through the rod (5).

Next, as shown in FIGS. 18 and 19, the material is carried in from the neck portion (4) of the manhole and the propulsion device (6) is installed in the expanding direction. In this installation work, first, the receiving girder (7) is installed as shown in FIG. 18, and then, as shown in FIG. 19, the reaction girder (8) is applied to the side wall on the side to be expanded. In this manner, the hydraulic jack (9) serving as a propulsion source is installed on the expanding side of the reaction force girder (8). Further, a cylindrical steel box or a precast concrete box (20) (hereinafter, these boxes are simply referred to as a box (20)) is assembled and applied to a side wall on which the box (20) is expanded. Then, the hydraulic jack (9) is set so that the box (20) can be propelled.

Since the box (20) is divided into a number of members before assembling, it can be easily carried in from the neck (4) of the manhole (3). As shown in FIG. 22, the box (20) has a cross-sectional area which is larger than the cross-sectional area of an existing pipeline (not shown) extending in the width direction of the manhole (3) or a newly installed pipeline (not shown). The opening has a large opening area, and is mounted on the girder portion (7) with the opening facing the extension direction so as to face the existing pipeline or the new pipeline. Two hydraulic jacks (9) are provided as shown in the figure, and are set at the center of gravity of the box (20) so that the propulsive force is evenly applied to the entire periphery of the opening of the box (20).

Before or after the installation of the propulsion device (6) and the assembling of the box (20), as shown in FIG. 20, the manhole wall, which is the side wall on the expanding side, was demolished. A box (20) is pressed against the part.

Next, as shown in FIGS. 21 and 22, the box (20) is propelled in the direction shown by the arrow by operating the hydraulic jack (9), and then the inside of the box (20) is excavated. And excavation alternately, box (20)
To promote. When the box (20) reaches a predetermined position indicated by a one-dot chain line, a filler is injected and filled into the space on the outer periphery of the box (20) from the previously opened graft hole. Thereafter, as shown in FIG. 23, the temporary material such as the propulsion device (6) is removed to the outside of the manhole (3). When the box (20) is a steel box, as shown in the figure, the reinforcing bars (14) are arranged in the box (20) and the formwork (15) is attached. After that, ready-mixed concrete is supplied into the formwork from a pump car on the ground through a hose, and the concrete is poured. When the ready-mixed concrete is sufficiently hardened, the formwork (15) is removed as shown in FIG. 24, and the concrete manhole extension (23) is completed. On the other hand, when the box (20) is a precast concrete box, the manhole extension section (23) is not passed through the reinforcing step, the step of attaching the formwork, the step of placing and curing the ready-mixed concrete, and the step of removing the formwork. )
Is completed. Next, as shown in FIG. 25, a new cable (24) is inserted through the manhole extension (23), and all operations are completed.

The method for expanding a manhole according to claim 3 is not limited to the above-described embodiment. In the above-described embodiment, the manhole extension part (23) is formed from one box (20).
However, the manhole extension part (23) may be formed from a plurality of boxes (20) connected in the axial direction. In this case, for example, after propelling one box (20), the inside thereof is excavated, and after propelling to a predetermined position, the next box (20) is connected to the rear end of the box (20). After the connected box (20) is propelled, the process of excavating the inside of the box and propelling it to a predetermined position may be repeated. Thereby, as shown in FIG. 26, a long manhole extension (23) in which a plurality of boxes (20) are connected in the axial direction can be formed, and a long cable can be reliably inserted inside the manhole extension. It can be stored, and many cables and devices can be stored and installed. In addition,
In the figure, reference numeral (13) denotes an existing pipeline, and (25) denotes a new pipeline.

According to a third aspect of the present invention, there is provided a manhole expanding method,
Since the non-cutting method is used, construction can be performed without any restriction on excavation, the area occupied by the road surface can be reduced, and noise reaching the ground can be reduced. Further, the construction cost can be reduced to about 60% of the conventional manhole expansion method by digging. Further, the number of construction days can be reduced to about １ ／ of the manhole expansion method by digging. Further, it is possible to sufficiently secure a space for connecting cables and a space for storing and installing various cables and devices. In addition, since the manhole is expanded in the width direction, a cable extending in the width direction of the manhole can be stored, and the cable can be stored regardless of whether it is a leaded OF cable or a CV cable. it can. Therefore, the performance of the manhole can be greatly improved.

[0025]

According to the first aspect of the present invention, the method for expanding manholes employs a non-cutting method, so that the method can be carried out without being restricted by excavation, and the area occupied by the road surface can be reduced. The noise reaching the ground is low. Further, the construction cost can be reduced to about 60% of the conventional manhole expansion method by digging. Further, the number of construction days can be reduced to about １ ／ of the manhole expansion method by digging. Further, it is possible to sufficiently secure a space for connecting cables and a space for storing and installing various cables and devices. Further, since the steel box is cylindrical, the vertical component of the earth pressure applied to the upper surface can be made relatively small. Therefore, it is possible to perform the construction so that the tip of the steel box does not fall during propulsion and the steel box is horizontal.

The method for expanding a manhole according to claim 2 is as follows:
Since the non-cutting method is used, construction can be performed without any restriction on excavation, the area occupied by the road surface can be reduced, and noise reaching the ground can be reduced. Further, the construction cost can be reduced to about 60% of the conventional manhole expansion method by digging. Further, it is possible to sufficiently secure a space for connecting cables and a space for storing and installing various cables and devices. In addition, since the box to be propelled is made of precast concrete, there is no need for the rebar arrangement process, the formwork setting process, the ready-mixed concrete placing process, the ready-mixed concrete curing process, and the formwork removal process, greatly shortening the construction period. It can be reduced to about 1 / 1.7 of the manhole expansion method by excavation. Also, construction costs can be significantly reduced.

[0027] The method for expanding manholes according to claim 3 is as follows.
Since the non-cutting method is used, construction can be performed without any restriction on excavation, the area occupied by the road surface can be reduced, and noise reaching the ground can be reduced. Further, the construction cost can be reduced to about 60% of the conventional manhole expansion method by digging. Further, the number of construction days can be reduced to about １ ／ of the manhole expansion method by digging. Further, it is possible to sufficiently secure a space for connecting cables and a space for storing and installing various cables and devices. In addition, since the manhole is expanded in the width direction, a cable extending in the width direction of the manhole can be stored, and the cable can be stored regardless of whether it is a leaded OF cable or a CV cable. it can. Therefore, the performance of the manhole can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a cable protection and chemical solution injection step in the invention according to claim 1;

FIG. 2 is a cross-sectional view showing a step of installing a propulsion device in the invention according to claim 1;

FIG. 3 is a sectional view showing a step of assembling and installing the steel box in the invention according to claim 1;

FIG. 4 is a sectional view showing a manhole wall breaking step in the invention according to claim 1;

FIG. 5 is a sectional view showing a propulsion excavation step in the invention according to claim 1;

FIG. 6 is a perspective view showing a propulsion excavation step in the invention according to claim 1;

FIG. 7 is a cross-sectional view illustrating a reinforcing arrangement / form setting step in the invention according to claim 1;

FIG. 8 is a sectional view showing a state after the removal of the formwork in the invention according to claim 1;

FIG. 9 is a cross-sectional view showing a cable entry state in the invention according to claim 1;

FIG. 10 is a perspective view showing an example of a precast concrete box in the invention according to claim 2;

FIG. 11 is a perspective view showing one example of a precast concrete box in the invention according to claim 2;

FIG. 12 is a sectional view showing a step of assembling and installing a steel box in the invention according to claim 2;

FIG. 13 is a sectional view showing a manhole wall breaking step in the invention according to claim 2;

FIG. 14 is a sectional view showing a propulsion excavation step in the invention according to claim 2;

FIG. 15 is a sectional view showing a state in which propulsion is completed in the invention according to claim 2;

FIG. 16 is a cross-sectional view showing a cable insertion state in the invention according to claim 2;

FIG. 17 is a sectional view showing a chemical solution injection step in the invention according to claim 3;

FIG. 18 is a sectional view showing a step of installing the propulsion device according to the third aspect of the invention.

FIG. 19 is a sectional view showing a step of assembling and installing a steel box in the invention according to claim 3;

FIG. 20 is a sectional view showing a manhole wall breaking step in the invention according to claim 3;

FIG. 21 is a sectional view showing a propulsion excavation step in the invention according to claim 3;

FIG. 22 is a perspective view showing a propulsion excavation step in the invention according to claim 3;

FIG. 23 is a cross-sectional view showing a reinforcing arrangement / form setting step in the invention according to claim 3;

FIG. 24 is a sectional view showing a state after the removal of the formwork in the invention according to claim 3;

FIG. 25 is a cross-sectional view showing a cable insertion state in the invention according to claim 3;

FIG. 26 is a perspective view showing another embodiment of the invention according to claim 3;

FIG. 27 is a cross-sectional view showing a conventional manhole expanding method.

[Explanation of symbols]

 3 ... manhole 4 ... neck 6 ... propulsion device 10 ... steel box 15 ... form 17 ... precast concrete box 20 ... ···box

Claims (3)

[Claims] 1. A method for extending a manhole in a longitudinal direction thereof by a predetermined length, wherein a propulsion device is installed in the manhole inside the manhole from the neck of the manhole in the extending direction and a cylindrical steel box is provided. The steel box is disposed on the propulsion device with the opening of the steel box facing the extension direction, and the manhole wall in the extension direction is broken before or after the installation of the propulsion device and before or after assembly of the steel box. After excavating the inside of the steel box while propelling the steel box by the propulsion device, and excavating a predetermined length, the excavated hole is provided with reinforcement and a formwork is attached. A method of expanding manholes, in which concrete is poured into the building and then the formwork is removed. 2. A method of extending a manhole by a predetermined length in a longitudinal direction thereof, wherein a propulsion device is installed in the manhole inside the manhole in a direction of extension by means of a machine carried from a neck of the manhole, and a cylindrical precast concrete is provided. Assembling the box, disposing the precast concrete box on the propulsion device with the opening of the box facing the extension direction, and installing the manhole wall in the extension direction before installation of the propulsion device and assembling the precast concrete box or A method of expanding a manhole, wherein the manhole is excavated later while the inside of the precast concrete box is excavated while being propelled by the propulsion device, and a front plate is attached to a front end opening of the precast concrete box. 3. A method of expanding a manhole by a predetermined length in a width direction thereof, wherein a propulsion device is installed in the manhole in a direction of expansion by means of equipment brought in from a neck of the manhole, and a cylindrical steel box is provided. Or assembling a precast concrete box, disposing the box on the propulsion device with the opening of the box facing in the direction of expansion, and mounting the manhole wall in the direction of expansion before or after installation of the propulsion device and assembly of the box. In the demolishing, the inside of the box is excavated while propelling the box by the propulsion device, and when the box is a steel box, after performing a predetermined length of excavation, rebars are provided in the excavated hole. A method for expanding manholes, comprising attaching a formwork, casting concrete into the formwork, and then removing the formwork.