JP2007285066A - Repairing and reinforcing method of manhole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of repairing and reinforcing an existing manhole safely and surely in a short construction period by using a concrete panel without removing or replacing an old or degraded structure. <P>SOLUTION: In the repairing and reinforcing method of the manhole, an inner wall surface 1<SB>1</SB>which is old or degraded by hydrogen sulfide gas or the like in the existing manhole 1 of a sewage or the like is abraded in a pitching process. After the abraded surface is jet-washed by a high-pressure washing device, acid-resistant concrete panels 10 each having a shape of a piece obtained when a circular form is divided into a plurality of pieces are assembled along the inner wall surface 1<SB>1</SB>in a manner of forming a tier or a plurality of tiers in the manhole 1. Then, the gap between the inner wall surface 1<SB>1</SB>of the manhole 1 and outer surfaces of the acid-resistant concrete panels 10, and the gap g' of a joint between adjacent concrete panels are filled with acid-resistant mortar 11 for adhesion and fixture. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for repairing and reinforcing an aged or deteriorated structure in an existing manhole.

  In general, there are many methods for repairing sewer pipes. And about the manhole part, although resin coating, mortar repair, etc. are implemented, there is a problem in strength, adhesion, durability, etc., and the actual situation is not established.

  Almost 100% of the sewer pipes are buried under the road, and of course, depending on the construction, road regulation is necessary. In addition, temporary ground bypass construction is required, and the construction period may be long, so it may be necessary to construct the construction period in a very short time, and repair and reinforcement methods that can shorten the construction period are required. .

Conventionally, the following inventions have been provided.
Invention of JP 09-268639 A Invention of JP-A-11-138737 Invention of JP 2002-106051 A

Said "patent document 1" is the cutting process which cuts the fabric which consists of glass fiber according to the magnitude | size of the backing part of the inner wall surface of a manhole, and the impregnation process which impregnates the resin liquid which consists of an epoxy resin etc. to the cut fabric And a pasting step of pasting the cloth impregnated with the resin liquid to a part or all of the lining portion of the inner wall surface of the manhole, and a polyethylene made of a material that does not adhere to the resin of the resin liquid It is the structure which consists of a press process which presses until the resin liquid hardens | cures using a press member.
In addition, “Patent Document 2” is a method for repairing and regenerating a pipe rod in which a horizontal pipe is provided between adjacent manholes, and the inner peripheral surface of the horizontal pipe and the manhole has flexibility and A lining material made of a synthetic resin having thermoplasticity is laid, and both the lining materials are integrally joined by heat welding.
And "patent document 3" inserts a housing in the existing manhole. The manhole is repaired by connecting the outlet of the enclosure and the washout of the manhole with a downstream pipe. In the existing manhole, the invert part and the outlet are easily corroded by hydrogen sulfide generated from the sewage flowing inside the sewage pipe connected to the outlet. Compared to the case where the corroded portion of the manhole is covered with a lining material such as mortar and repaired, the manhole can be repaired with simple means.

Since the conventional water supply and sewerage pipes are only equipped with a manhole for elevating people that are mainly designed for people going in and out, it is difficult to carry in and out equipment used for water supply and sewerage management repairs, etc. There was a problem.
And "patent document 1" has the feature which has the strength which can endure the permanent use of the said manhole with respect to corrosion by lining the cloth which consists of glass fiber on the inner wall surface of a manhole. However, the lack of strength due to peeling off the part damaged by hydrogen sulfide gas cannot be denied.
Next, in “Patent Document 2”, the lining laid on the inner peripheral surface of the manhole is to join a synthetic resin material having flexibility and thermoplasticity by heat welding. While beneficial, it lacks strength reinforcement at the part where the parts corroded by hydrogen sulfide are stripped.
And in "patent document 3," the corrosion part of the said invert part and an outflow port is repaired by inserting a casing in an invert part and an outflow port by hydrogen sulfide, but the inner periphery of the vertical hole site | part of a manhole No countermeasures are shown for repairs when the surface is corroded by hydrogen sulfide. Moreover, it cannot be repaired depending on the above-mentioned frame.

  Therefore, the present invention solves the above conventional problems and achieves the object of the invention.

  The first aspect of the present invention is a manhole repair and reinforcement method, in which an inner wall deteriorated or deteriorated by hydrogen sulfide gas or the like in an existing manhole in a sewer or the like is shaved, the shaved surface is washed, and then a circle is divided into a plurality of parts. After assembling the acid-resistant concrete panel in the manhole along the inner wall in a single step or multiple steps, the gap between the inner wall of the manhole and the outer surface of the acid-resistant concrete panel and the gap between the adjacent concrete panels It is made to fill with an adhesive.

  According to a second aspect of the present invention, in the manhole repair and reinforcement method according to the first aspect, the gap between the inner wall surface of the manhole and the outer surface of the acid-resistant concrete panel having a height that enters the entrance / exit of the manhole, and between the adjacent acid-resistant concrete panels The joint gap is filled with an acid-resistant mortar or an adhesive resin such as vinyl chloride.

  According to a third aspect of the present invention, in the manhole repair and reinforcement method according to the first aspect, the inner wall surface inside the manhole is shaved by a pitching process such as a pick hammer, and a high pressure washer is used to clean the shaved surface.

According to a fourth aspect of the present invention, in the manhole repair and reinforcement method according to the first aspect of the present invention, a fastener is inserted into a gap between seams of an acid-resistant concrete panel divided into a plurality of circles assembled along the inner wall surface of the manhole. The matching panel is fixed.

The present invention is constituted as described above and has the following effects.
First, the pitching process, cleaning process, acid-resistant concrete panel installation process, and acid-resistant adhesive filling process of the existing manhole inner wall surface layer can be repeated at a single stage height of 60 cm, greatly improving construction efficiency. Can be planned. In addition, the regulation work time on the road can be greatly shortened, and the cost can be reduced.
Secondly, it uses cement with high acid resistance, and uses concrete panels and backfill mortar, so it can minimize the impact on deterioration of concrete caused by hydrogen sulfide gas generated from the pipeline, and has a long service life. Can be improved.
Thirdly, only the surface layer of the inner wall of the existing manhole, which has deteriorated or deteriorated, is repaired and reinforced, so that it is possible to prevent a collapse accident and the safety is high.
Fourth, at the time of construction, it is possible to install a water-stop packer on the upstream pipe line of the existing manhole and to perform construction in a short time, so that there is no need for a temporary ground bypass facility or the like.
Fifth, by implementing this repair and reinforcement method in manholes, the construction period can be greatly shortened, the wall surface is free of defects and the repair surface is dense, and the surface of high-strength acid-resistant mortar. Can be formed. In addition, the construction speed is fast, so the construction cost is low and the safety during construction is high.

  In this existing manhole repair / reinforcement method, the degradation of the existing manhole's inner wall due to hydrogen sulfide gas is scraped off with a pick hammer in the pitching process, sprayed and washed with high-pressure water, and curved shaped. The concrete panel is set in place of the formwork and the gap between existing manhole concrete panels is filled with acid-resistant mortar with high immediate effect.

Next, an embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a manhole, which has a circular shape or a square shape in plan view, and the illustrated example shows a circular shape. Its inner wall surface 1 ₁ of the circular manhole 1 is molded in concrete, and worker diameter R 'is 600mm openings 2 in and out, the diameter R of toward the inner bottom portion from immediately below the opening has become 1200 mm. 3 is an inner bottom portion of the manhole 1, 4 is an upstream inflow pipe that is inserted and coupled to the wall hole 6 of the manhole 1, 5 is a downstream outflow pipe that is inserted and coupled to the wall hole 7 of the manhole 1, and 8 is an inner wall surface of the manhole. 11 is a trap provided on 1 ₁ and 9 is an upper cover of a manhole.

10 is acid resistant concrete panel obtained by dividing the circular plurality to stretched in a circular shape along the circumferential direction of the inner wall surface 1 ₁ of the manhole 1, the single panel 10 ₁ to 10n divided the forming a curved commensurate with the inner wall surface 1 ₁ of the circumferential direction when that panel processing. That is, when the inner wall surface 1 ₁ of the diameter R of the manhole 1 is set to 1200mm sets a gap g of the outer surface of the panel 10 ₁ to 10n in the order 7～11Mm, diameter R = 1200mm of the panel Or, it is formed into a convex arc shape having a small diameter of about 5 to 30 mm.
When the diameter R ′ of the manhole opening 2 is 600 mm, the height H of the panel is less than 600 mm so that it can pass through the panel. In this case, if the circumferential diameter R1200 mm is divided into four, the width of a single sheet is measured in a straight line, and the width W is approximately 850 mm, and if divided into six, the width of a single sheet is W≈610 mm.
The adjacent seams of the individual panels 10 _{1 to} 10 n obtained by dividing the circle into a plurality of parts are 5 to 1.
It is assumed that a gap g ′ of about 0 mm is formed.
The plate thickness t of the acid resistant concrete panel 10 (10 _{1 to} 10 n) is set to about 9 mm when the diameter R = 900 mm and about 12 mm when the diameter R = 1200 mm.

11 the outer surface and the gap g formed between the inner wall surface 1 ₁ of the manhole 1, the gap of the seam between the acid resistant panels adjacent the acid resistance concrete panel 10 for forming the cylindrical body (10 ₁ to 10n) It is an acid-resistant adhesive that is fixed by being poured and cured into g ′, and specifically, an acid-resistant mortar is used, but a resin adhesive such as vinyl chloride can also be used.
12 is a water stop packer packed in the inflow pipe 4 to temporarily stop the flow of sewage from the upstream side to the downstream side, and 13 is the inflow pipe 4 of the bottom acid-resistant concrete panel 10 (10 _{1 to} 10n). The hole drilled according to the wall hole 6 and the wall hole 7 of the outflow pipe 5 is shown. Reference numeral 14 denotes a fastener that is inserted into the gap g ′ of the seam between the divided acid-resistant concrete panels to fix them.

"Test results of acid-resistant concrete panels (Table 1)"
1. Material to be tested: acid-resistant concrete panel (Elephone Kasei Kogyo Co., Ltd. “Head office: provided by 1-1-23 Mikawa Shinmachi, Oita City, Oita Prefecture)”
2. Test method: Strength and density characteristics (permeation diffusion resistance), environment resistance (sulfuric acid resistance), in accordance with the method in accordance with the "required performance index of the section repair material for concrete repair manual processing facilities in the Tokyo Metropolitan Sewerage Bureau Facility Management Department" The test was conducted.
(1) Strength characteristics
Using a 40mm x 40mm x 160mm specimen as shown in JIS R 5201, cure underwater to the specified age and measure the bending and compressive strength.
(2) Density characteristics (osmotic diffusion resistance)
Cylinder of diameter 75mm x height 150mm is cured underwater until material age 28th, then 5% for 28 days
Immerse in sulfuric acid (change the sulfuric acid every week). After the immersion, cut the specimen and measure the color area with phenolphthalein reagent. The value obtained by subtracting the color gamut from 75 mm and dividing by 2 is the density characteristic.
・ Density characteristics = (Diameter 75mm-Colored area) / 2
(3) Environmental characteristics (sulfuric acid resistance)
Environment resistance is the same specimen as the density characteristics, and the difference in weight before and after immersion in sulfuric acid is expressed as a percentage of that before immersion.
・ Environment resistance = {(weight after sulfuric acid immersion−weight before sulfuric acid immersion) / weight before sulfuric acid immersion} × 100

“Remarks: Unit of bending / compressive strength is N / mm ² ”

“Acid resistance mortar test results” “acid resistance mortar blending”, “conditions”, and “test results of the above blending” are shown in “Table 2” below.

“Remarks: The change in bond strength of acid-resistant cement due to curing temperature is shown in FIG. 5.”

"Specific examples of repairing existing manholes"
Next, an example of repairing an existing manhole according to the present invention will be described.
(1) Implement traffic restrictions on existing manhole roads for repair and reinforcement.
(2) the deterioration condition of the concrete in the wall 1 ₁ of the existing manhole 1 was confirmed by the test hammer, determines the repair thickness and repair height by pitching step.
(3) A water-stopping packer 12 is attached in the pipe line on the upstream side of the manhole 1 to be repaired to temporarily stop the flow of sewage.
(4) to repair height inner wall surface 1 ₁ which is eroded by hydrogen sulfide gas etches pitching step such as pick hammer.
(5) of the cutting site manhole wall 1 _1, injects washed with existing high pressure washer (maximum discharge pressure 210 kg / cm @ 2 'not shown').
(6) The existing trap 8 within the repair height is cut with an oxygen gas burner or the like.
(7) The single panel (10 _{1 to} 10 n) of the acid-resistant concrete panel 10 divided into four pieces is set so that its height H (less than 600 mm) is horizontal (the vertical direction of the curved direction of the single panel) When the panel is suspended from the manhole opening 2 and lowered to the inner bottom surface 3 or after it is lowered, the horizontal panel is redirected to the original height direction. This operation is repeated for the number of single panels and assembled in the circumferential direction.
(8) the inner wall surface 1 ₁ and gap g and the panel acid resistance mortar 11 in the gap g 'seam between the acid resistance concrete panel 10 of the manhole 1 repair target injection strokes set to the panel on the inner wall surface 1 Stick. At this time, if necessary, the stopper 14 is inserted into the gap g between the adjacent panels to fix them together.
(9) Using the acid-resistant concrete panel 10, the above operations (7) and (8) are repeated to a repair height of a single stage or two or more stages.
(10) Finally, drilling the inner wall surface 1 ₁ a mounting portion of the ramp 8 attached.
(11) Remove the water stop packer 12 packed in the upstream pipe line of the manhole 1 and restart the flow of the sewer.
(12) Release traffic restrictions on the current road and complete.

It is a perspective view of the manhole to which this invention is applied. It is a top view of the state which removed the upper cover of FIG. It is an expanded sectional view which follows the 3-3 line of FIG. It is the perspective view which assembled the acid-resistant concrete panel divided | segmented into circular. It is a line graph which shows the adhesive strength change by the curing temperature of acid-resistant cement.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Manhole 2 ... Manhole opening 3 ... Manhole inner bottom 4 ... Inflow pipe inserted and coupled to inner wall hole of manhole 5 ... Outflow pipe inserted and coupled to inner wall hole of manhole 6 ... Inner wall hole on upper inflow pipe side of manhole 7 ... Inner wall hole on the lower outflow pipe side of the manhole 8 ... Trapping 9 ... Upper lid of the manhole opening 10 ... Acid-resistant concrete panel 11 ... Adhesive mortar 12 ... Water-resistant packer 13 ... Inflow pipe and outflow in acid-resistant concrete panel Hole for pipe

Claims (4)

  After shaving the inner wall surface that has deteriorated or deteriorated with hydrogen sulfide gas in the existing manhole in the sewer, etc., and cleaning the shaved surface, an acid-resistant concrete panel divided into a plurality of circles is simply placed along the inner wall surface in the manhole. Manhole repair and reinforcement characterized by filling the gap between the inner wall of the manhole and the outer surface of the acid-resistant concrete panel and the gap between the adjacent concrete panels with an acid-resistant adhesive after assembling in one or more stages Method.   Claims filled with a resin adhesive such as acid mortar or vinyl chloride in the gap between the inner wall of the manhole and the outer surface of the acid-resistant concrete panel that is high enough to enter the entrance and exit of the manhole, and the gap between the seams between adjacent acid-resistant concrete panels The manhole repair and reinforcement method according to Item 1.   The manhole repair and reinforcement method according to claim 1, wherein an inner wall surface inside the manhole is cut by a pitching process, and spray cleaning to the cut surface is performed using a high pressure washer.   The manhole repair and reinforcement method of Claim 1 which fixed the adjacent said panel by inserting the metal fitting into the gap of the joint of the acid-resistant concrete panel which divided | segmented the circular assembled along the inner wall surface of a manhole into plurality.