JP2004068596A - Manhole repairing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manhole lid/frame replacing method, minimizing the coverage of work during replacing a manhole lid/frame as scheduled, eliminating the need for a surface compacting process, reducing working processes and a working period and avoiding vibration-or noise-caused pollution. <P>SOLUTION: In replacing the manhole lid/frame in electric, telegram, gas and water supply and sewerage systems, an arcuate or spherical cutout 1 is formed around the lid/frame to permit the separation and removal thereof. A high-fluidity non-contractive filler is filled as a roadbed material 6 in a space of separation and removal, which has self-hardness and is composed of mortar mainly containing a metal non-contractive material such as calcium, sulfur, or aluminate. This eliminates the need for the surface compacting process. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a method for repairing manholes in electricity, telegraph, gas, water and sewage systems, and the like.

Conventionally, when replacing manhole covers / frames in electricity, telegraph, gas, water and sewage systems, etc., cut into square plates or circular plates with a straight cut surface using a flat cutter, core cutter, etc. After the part is removed, the repaired part is filled with a repair material, and then the work is finished by compacting work using a rolling machine.

Further, the disclosed pavement road surface opening method includes a step of cutting a pavement road surface along a periphery of an opening to be opened and pulling up and removing the cut columnar pavement plate. Is embedded, the columnar pavement is cut into a circle or a square, and in the case of a square, at least two opposing sides are cut so as to be tapered in the depth direction. " Reference 1).
Japanese Patent Publication No. 2-15687

However, in the above-described conventional example, not only in the case of cutting into a quadrangle but also in the case of circular cutting, angular corners are generated at the four corners and the entire bottom edge in the former case, and at the entire bottom edge in the latter case. (See FIG. 4 (b).) Even when a filler such as a repair material is filled, the filler does not sufficiently spread to the corners to form a gap, the cut portion becomes a substantially vertical wall surface, and the friction on the side surface of the cut portion. Since it is supported only by force, it is easy to settle because it is displaced, so that rainwater or the like easily penetrates through a gap formed on the road surface, which promotes settlement and induces an accident.

(4) In the case of cutting into a quadrangle, as shown in FIG. 4 (b), an extra cut cross portion is formed at the quadrangle, and repair for that amount is also included.

As described above, in the conventional method, extra repair work such as the cut cross section occurs, and if the compaction work is not performed in the post-process at the time of the repair work, the surface layer and the roadbed part will sink over time. However, there are inconveniences such as the possibility of unevenness on the road surface.

Natural in a conventional filler, there can not be shortened remainder construction period, including curing time, further there is room for improvement in terms of noise pollution, there is a like problem.

The present invention has been made in view of the above circumstances, upon replacement work of scheduled manhole cover / frame, the work range is minimized, providing the construction process and reduction / shortening can manhole repair methods construction period The task is to

According to the present invention , a manhole repair method is configured as described in the following (1) to (3) in order to solve the above problems.

(1) on the road surface with a manhole cover, a step cut add rotation arcuate or spherical switching interrupt size in the depth direction in the manhole cover and concentric narrowing,
A removing step of removing the pavement material and the lid receiving frame between the notch formed in the cutting step and the lid receiving frame receiving the lid ,
A lid receiving frame setting step of installing a new lid receiving frame after the lid receiving frame removed in the removing step,
A filling step of filling a pavement material into a space between the lid receiving frame and the cut provided in the lid receiving frame setting step until the surface is at the same height as the road surface,
Ma Nhoru repair method with a.

(2) before SL (1) Manhole repair method according,
The new lid receiving frame are those height adjustment unit with the anchor bolt is included in the cover receiving frame installation process, the upper surface of the lower basins, Ma Nhoru repair to adjust the height of the installed lid receiving frame the anchor bolt How .

(3) before SL (1) or (2) Manhole repair method according,
The manhole repairing method according to claim 1 , wherein in the cutting step, a cut is made up to a surface of the lid receiving frame .

The present invention, upon replacement work of scheduled manhole cover / frame, the work range is minimized, it is possible to provide the construction process and reduction / short Chijimide comes manhole repair methods construction period.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to examples.

Hereinafter, the “manhole repair method” of the first embodiment will be described.

FIG. 1 is an explanatory view showing an example of a situation where a circular arc or spherical cut is made around a predetermined manhole cover / frame by using a road surface cutter device having a circular arc or spherical cutter. 2 (a) is a cross-sectional explanatory view showing an example of a situation after a cut piece has been cut and made detachable, and FIG. 2 (b) is a schematic external perspective view of the cut piece. FIG. 3 is a manhole. Detailed cross-sectional explanatory view showing an example of the final process construction status after lid / frame replacement, (a) is a detailed cross-sectional explanatory view when the roadbed material and the adjustment member are filled, (b) is a detailed cross-sectional explanatory view after filling the surface layer material, FIGS. 4A and 4B are comparative explanatory views of the present method according to the present invention and a conventional method which has been conventionally performed. FIG. 4A shows a case of a rotary arc (spherical) cutting of the present method, and FIG. Example of square (four process) cutting or circular cutting of the construction method, FIG. 5 ( ) Is a side sectional view showing a situation where the reinforcing rebar is disposed in a network form, (b) is an A-part enlarged view.

The present embodiment is a case where the road surface cutter disclosed in Japanese Patent Application Laid-Open No. 2001-295216 or the road surface cutter device of Japanese Patent Application No. 2002-60514 is used, and the wall surface serving as a cutting surface is rotated by a rotating circle. Cutting work can be performed in an arc or spherical shape and in a minimum necessary range.

Using said device, a circular arc or spherical cut 1 of predetermined depth is made on the concentric road surface of the planned manhole cover / frame, and the parts requiring replacement, for example, the cover and the cover receiving frame 2 'are replaced. Then, in the space after the cut pieces are separated and removed, a self-hardening mortar made of a mortar containing a metal-based non-shrinkable material such as calcium, sulfo, or aluminate, which is prepared as the roadbed material 6, for example, is prepared in advance. The surface layer material 8 containing a fluid non-shrinkable filler and containing fibrous material in the surface layer portion of the road surface may be finished according to the existing road surface without being raised extra.

Hereinafter, embodiments will be described in detail with reference to the drawings.

In FIG. 1, a First, when the diameter d of the lid receiving frame 2 'requiring replacement is 654 mm, the diameter D to be cut is 1000 mm, and a road surface cutter device provided with a rotating arc or spherical cutter prepared in advance is used. The wheel angle is set (one-touch operation), and the device is turned 360 ° to make a circular arc or spherical cut 1 (pavement cutting). B Then, as shown in FIG. 2) is removed to form a pseudo annular (doughnut-shaped) space as shown in FIG. 2 (a), the old lid receiving frame 2 'is removed, and the upper surface of the lower box 3 is cleaned. Then, an anchor bolt 5 with a height adjuster (post-installed anchor bolt) is installed (see FIGS. 3 (a) and 3 (b)), the height is adjusted, and the new lid receiving frame 2 and inner mold 4 are mounted. Attach. Next, the d roadbed material 6 and the adjusting member 7 are filled, and after the curing time (about 19 minutes) elapses, the e surface material 8 is filled, for example, to a thickness of 50 mm (h), and a finishing operation is performed. The actual work is completed in about 30 minutes of curing time in Step 8.

で は In this example, the actual total work time was 2 hours and 14 minutes.

As described above, the roadbed material 6 and the adjusting member 7 are made of a self-hardening high-fluidity non-shrinkable filler made of mortar containing a metal-based non-shrinkable material such as calcium, sulfo, and aluminate. I have.

Of course, in this method, the filling material that becomes the repair material hardens to a predetermined strength in a short time, so the total required construction time from the start of construction to completion is within 3 hours (seasonal and environmental conditions). The operation time can be reduced to about 1/2 or less as compared with the conventional method.

The greatest feature of this method is that the wall of the cut portion can be formed into a rotating arc-shaped or spherical cut portion 1a instead of a columnar shape as in the prior art. Therefore, as shown in FIG. As shown in FIG. 4 (a), for example, as shown in FIG. 4 (a), the material (filler) generates a pressure P from above, that is, a load P of a vehicle or the like, by the centripetal support force in addition to the frictional force of the cut portion forming a spherical shape. The more it is received, the more the adhesion between the filler and the cut portion 1a is increased, and the sinking phenomenon of the repaired portion due to rainwater permeation from a gap or the like (see FIG. 4 (b)) and the like, such as a columnar cut wall in the conventional method, etc. It is possible to perform manhole cover / frame replacement work completely safely and quickly by avoiding troubles and avoiding troubles.

( Modification 1)
Example 1 differs from the foregoing, a high fluidity non-shrink filler is that it uses a mortar compound containing mainly non-metallic non-shrink materials without metal aggregate.

( Modification 2)
The difference from the first embodiment is that reinforcing reinforcing bars are arranged in a mesh when filling the highly fluid non-shrinkable filler.

As shown in FIGS. 5 (a) and 5 (b), by arranging reinforcing bars of a predetermined thickness in a mesh at a predetermined pitch inside a roadbed material to be a high-flow non-shrinkage filler, the vicinity of Even if the roadbed collapses, it is not affected and can maintain safety.

In Example 1 described above, it is used to specify the high flow non-shrink filler, in this method, unnecessary material compaction or rolling clamping solidifying step or manually about pressurization operation, Any material can be used, and there is no limitation.

Explanatory drawing showing an example of a situation where a circular arc or spherical cut is made around a predetermined manhole cover / frame using a road surface cutter device having a circular arc or spherical cutter. (A) A cross-sectional explanatory view showing an example of a situation after a cut piece that has been cut and made detachable can be removed, and (b) a schematic external perspective view of the cut piece. Detailed cross-sectional explanatory view showing an example of the final process construction status after manhole cover / frame replacement, (a) detailed cross-sectional explanatory view when the roadbed material and adjustment member are filled, and (b) is a detailed cross-sectional explanatory view after filling the surface material. FIG. 3 is a diagram illustrating a comparison between the present method according to the present invention and a conventional method that has been conventionally performed. (A) In the case of a rotary arc-shaped (spherical) cut in the present method, (b) a square (four-step) cut in the conventional method Or for circular cutting (A) Side sectional view showing the situation when reinforcing reinforcing bars are arranged in a mesh form, (b) A part enlarged view

Explanation of reference numerals

1 Rotating circular or spherical cut 1a Rotating circular or spherical cut 2, 2 'Lid receiving frame 3 Lower box 4 Inner form 5 Anchor bolt with height adjustment part (post-installed anchor bolt)
6 Roadbed material 7 Adjusting member 8 Surface material

Claims (5)

When replacing manhole covers / frames in electricity, telegraph, gas, water and sewage systems, etc., make cuts in a circular arc or spherical shape around the covers / frames so that they can be separated and removed. A manhole cover / frame replacement method, characterized in that a self-hardening high-fluidity non-shrinkable filler is filled to eliminate a rolling step. 2. The manhole cover / frame replacement method according to claim 1, wherein the high-flowability non-shrinkable filler is mainly made of mortar containing a metal-based non-shrinkable material such as calcium, sulfo, and aluminate. Lid / frame replacement method. 2. The manhole cover / frame replacement method according to claim 1, wherein the high-flowability non-shrinkable filler is mainly made of mortar containing a nonmetallic non-shrinkable material that does not contain a metallic aggregate. / Frame replacement method. マ ン The manhole cover / frame replacement method according to claim 1, wherein the road surface material is a fibrous material. The manhole cover / frame replacement method according to claim 1, wherein reinforcing bars are arranged in a mesh when filling the high-flow non-shrink filler.

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