JP2012036655A - Method of reclaiming sewerage manhole and the manhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of reclaiming a manhole and the manhole, allowing construction to be easily and efficiently performed without requiring a special tool or device, and preventing the manhole from floating or sinking at earthquake occurrence which is a challenging problem at the present day.SOLUTION: A lining block 2 comprises a plate body 2a made of cast metal having an arched cross section, which is provided with a female engaging part 2c and a male engaging part 2d on both sides in vertical direction and coated with a synthetic resin 2b. The female engaging part 2c and the male engaging part 2d of neighboring lining blocks are engaged, so that the lining blocks 2 are circularly arranged on an inner face of a manhole 1. Mortar 3 is cast between the lining blocks 2 and the inner face of the manhole 1 to fasten the lining blocks 2 to the inner face of the manhole 1.

Description

  The present invention relates to a method for rehabilitating a sewer manhole and the manhole.

  The life span of concrete manholes is about 50 years, but the existing sewer manholes that have been in use for more than 20 years will deteriorate earlier than the actual life due to corrosion caused by hydrogen sulfide gas generated from sewage, Many manholes that need to be reinforced or replaced are problematic.

  As a method for rehabilitating these deteriorated manholes, after cleaning old manholes, a primer was applied to the inner surface of the manhole, a spacer-attached bonding plate was attached to the manhole wall surface, and a thermosetting resin was impregnated inside it. After the manhole lining material is inserted into the manhole, the manhole lining material is inflated by air pressure, then hot water is circulated in a full water state and thermally cured, and after the manhole lining material is cured, the pipe opening and the inverted part are cut off, A rehabilitation method called the Tayan method has been proposed in which a filler is penetrated between a manhole and a connecting plate, and the manhole lining material and the existing manhole inner surface are connected.

  This rehabilitation method is a technique for forming a composite manhole by combining the manhole lining material and the existing manhole inner wall with a bonding plate and a filler, and rehabilitating an aging manhole, but as can be seen from the above explanation, Not only is the process complicated and workability is poor, but there is also a drawback in that dedicated tools and devices are required.

Fiscal 2007 Annual Report of New Institute for Sewerage Technology (Summary), p. 74

  The present invention does not require a special tool or device, can be easily and efficiently constructed, and at the same time, is a manhole that has the effect of preventing the manhole from rising or sinking when an earthquake occurs, which is currently a major problem. It intends to provide rehabilitation methods and their manholes.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 is characterized in that a female engaging part and a male part are provided on both sides of a plate-shaped or strip-shaped casting body having a circular cross section. A lining block provided in the vertical direction with a mold engaging part and covered with synthetic resin is annularly arranged on the inner surface of the manhole by engaging the female engaging part and male engaging part of the adjacent lining block The manhole rehabilitation method is characterized in that mortar is poured between the lining block and the inner surface of the manhole, and the lining block is fixed to the inner surface of the manhole.

  According to the second aspect of the present invention, a female engagement portion and a male engagement portion are provided in the vertical direction on both sides of a plate-shaped or strip-shaped main body having a circular cross section, and an appropriate number of mortars penetrate. A lining block provided with holes is annularly arranged on the inner surface of the manhole by engaging the female engagement portion and the male engagement portion of the adjacent lining block, and between these lining blocks and the manhole inner surface. The mortar is poured into the mortar through hole, and the exposed portion of the lining block lined in the manhole is covered with mortar.

  The invention according to claim 3 is provided with a female engaging portion and a male engaging portion in the vertical direction on both sides of a plate-shaped or strip-shaped main body having a circular cross section and covered with a synthetic resin. The lining block is annularly arranged on the inner surface of the manhole by engaging the female engaging portion and the male engaging portion of the adjacent lining block, and mortar is poured between the lining block and the manhole inner surface. A manhole characterized in that the lining block is fixed to the inner surface of the manhole.

  According to a fourth aspect of the present invention, a female engagement portion and a male engagement portion are provided in the vertical direction on both sides of a plate-shaped or strip-shaped main body having a circular cross section, and an appropriate number of mortars penetrate. A lining block provided with holes is annularly arranged on the inner surface of the manhole by engaging the female engagement portion and the male engagement portion of the adjacent lining block, and between these lining blocks and the manhole inner surface. The mortar is poured into the mortar through hole, and the exposed portion of the lining block lined in the manhole is covered with mortar.

  In the method for rehabilitating a manhole according to the first aspect of the present invention, the female engaging portion and the male engaging portion of the adjacent lining block are engaged with each other, and the manhole is arranged annularly on the inner surface of the manhole. The work of pouring mortar between the inner surface of the manhole and fixing the lining block to the inner surface of the manhole is simply repeated from the bottom, so the lining work, that is, the manhole rehabilitation work can be performed easily and in a good procedure. It requires no tools or equipment and is excellent as a construction method.

  When the lining blocks are lined up firmly and fixed to the inner surface of the manhole, rehabilitating the manhole, and adding the lining block to the existing manhole, the apparent specific gravity of the manhole is 1 or more. The deteriorated existing manhole is rehabilitated, and at the same time, it has the effect of being given the function of preventing the ascent or settlement when an earthquake occurs.

  The synthetic resin coating portion may be the entire lining block, or may be only the portion exposed when lining the manhole, for example, the inner surface.

  The invention described in claim 1 is a method for rehabilitating manholes when a cast lining block having a surface coated with a synthetic resin to provide corrosion resistance is used. In this case, a mortar is used to provide corrosion resistance to the cast lining block, and the construction is described in claim 1. Although a little more labor and simple annular formwork are required than the present invention, manhole rehabilitation and the function of preventing the manhole from rising or sinking in the event of an earthquake can be imparted as in the first aspect of the invention.

  The invention according to claim 3 relates to a manhole when the invention according to claim 1 is applied, and the invention according to claim 4 relates to a manhole when the invention according to claim 2 is applied. In addition, there is an effect that it is possible to provide a manhole having a function to prevent the manhole from rising or sinking in the event of an earthquake, and the configuration and strengthening of the existing manhole.

1 is a longitudinal sectional view of Embodiment 1 of the present invention. FIG. 2 is a cross-sectional plan view of FIG. 1. The perspective view which excised a part of block for lining used for Example 1 of the present invention. The perspective view of the block for lining used for Example 2 of this invention. Explanatory drawing which shows the construction procedure of Example 2 of this invention.

  FIG. 1 is a longitudinal sectional view of an existing manhole subjected to rehabilitation according to the first aspect of the invention, FIG. 2 is a cross-sectional plan view thereof, 1 is an existing manhole, 2 is a lining block, 3 is an existing manhole 1 Mortar 4 poured between the lining blocks 2 is a butyl rubber sealing material sandwiched between the lower and upper lining blocks.

  FIG. 3 shows the structure of the lining block 2 used in Example 1, in which a main body 2a of a cast iron lining block is coated with a synthetic resin 2b, and the main body 2a is an arc-shaped plate. The female engagement portion 2c and the male engagement portion 2d are provided on both sides in the vertical direction.

  When rehabilitating the existing manhole 1, the inner surface of the aged manhole is cleaned, and then the inner block 2 is replaced with the female engaging portion 2c and the male engaging portion 2d of the adjacent inner covering blocks 2 and 2, respectively. As shown in the figure, they are arranged in an annular shape inside the manhole 1 and are lined sequentially from the lower stage while pouring mortar 3 between the manhole 1 and the lining block 2. In this embodiment, a sealing material 4 made of butyl rubber is sandwiched between the lower lining block 2 and the upper lining block 2.

  As the mortar 3 for bonding the lining block 2 to the manhole 1, non-shrinkable mortar using acid-resistant blast furnace granulated slag is preferable. As this type of mortar, those having various curing speeds such as early strength, ultra-early strength, and ultra-high strength are commercially available.

  As described above, the work procedure is extremely simple and excellent in workability, and thus is suitable as a rehabilitation method.

  And, when the manhole 1 is strengthened by lining the lining block 2 and the apparent specific gravity of the manhole is set to 1 or more, the existing manhole is deteriorated, and at the same time, the rise or sink in the event of an earthquake A prevention function is added.

  While Example 1 is the case where the invention of claim 1 is applied, Example 2 is the case where the invention of claim 2 is applied, that is, a casting in which the surface is not coated with an acid-resistant synthetic resin. Example 2 is an example in which a cast iron lining block is used.

  FIG. 4 is a perspective view showing the structure of the lining block 2 ′ in the second embodiment. The main body 2′a has two mortar through-holes 5 and 5 and a female type like the lining block 2 in the first embodiment. An engaging portion 2c and a male engaging portion 2d are provided.

  The lining procedure of the lining block 2 'in this case is the same as in the first embodiment, as shown in FIG. 5, and the female engaging portion 2c and the male engaging portion 2d of the adjacent lining blocks 2' and 2 '. Are connected inside the manhole 1 and arranged inside the manhole 1, and a flexible mortar retaining frame 6 is installed inside the manhole 1. Then, the mortar 3 is placed between the manhole 1 and the lining block 2 ′ and the lining block. After pouring between 2 'and the mortar retaining frame 6 and into the mortar through-hole 5, and the mortar 3 is solidified, the upper lining block 2' is connected in an annular shape like the first tier and placed on the lower lining block. After the mortar retaining frame 6 is moved upward as shown in FIG. 5, the mortar 3 is poured between the manhole 1 and the lining block, into the mortar through hole 5, and between the lining block and the mortar retaining frame 6. 3 To reduction. Reference numeral 4 denotes a sealing material made of butyl rubber, which is stuck on the lower lining block 2 'when the lining block 2' is placed on the upper tier.

  When the lining block 2 'is lined on the inner wall of the manhole 1 by the above procedure, the mortar 3 between the manholes 1, the mortar 3 in the mortar through hole 5, and the mortar 3 covering the exposed surface of the lining block 2' As a result, the lining block 2 'is firmly fixed to the manhole 1 and at the same time, the adhesion of the mortar 3 covering the exposed surface of the lining block 2' is enhanced and the peeling is prevented. That is, by providing the mortar through hole 5, the effect of holding the mortar covering both surfaces of the lining block with the mortar filled in the mortar through hole 5 can be obtained. The surface of the lining block 2 ′ is preferably roughened in order to improve the bonding with the mortar 3. .

  As can be easily understood from the above description, the rehabilitation of the manhole according to the second embodiment is slightly inferior in workability to the method of the first embodiment, but the strength of the deteriorated manhole 1 is reinforced as in the first embodiment. In addition, there is a feature that the inner surface is finished like a new product.

  Moreover, since the load is applied to the manhole 1, the function of preventing the ascent or sinking when an earthquake occurs can be provided by considering the overall apparent specific gravity to be 1 or more.

1 Manhole 2 Liner Block 3 Mortar 4 Sealing Material 5 Mortar Through Hole 6 Mortar Retaining Frame

Claims (4)

A lining block with a female engaging part and a male engaging part provided in the vertical direction on both sides of a plate-shaped or strip-shaped casting body having an arc-shaped cross section and covered with a synthetic resin is used for an adjacent lining. The female engaging part and male engaging part of the block are engaged and arranged annularly on the inner surface of the manhole, and mortar is poured between the inner block and the inner surface of the manhole, and the inner block is placed on the inner surface of the manhole. A manhole rehabilitation method characterized by fixing. A lining block provided with a female engaging portion and a male engaging portion in the vertical direction on both sides of a plate-shaped or strip-shaped casting body having a circular cross section and provided with an appropriate number of mortar through holes. The female engaging portion and the male engaging portion of the adjacent lining block are engaged with each other and arranged annularly on the inner surface of the manhole, between the inner lining block and the inner surface of the manhole, and in the mortar through hole. And the exposed portion of the lining block lining the manhole is covered with mortar. A lining block with a female engaging part and a male engaging part provided in the vertical direction on both sides of a plate-shaped or strip-shaped main body having a circular cross section and covered with a synthetic resin is used for the adjacent lining. The female engaging part and male engaging part of the block are engaged and arranged annularly on the inner surface of the manhole, and mortar is poured between the inner block and the inner surface of the manhole to fix the inner block to the inner surface of the manhole. A manhole characterized by that. A lining block provided with a female engaging portion and a male engaging portion in the vertical direction on both sides of a plate-shaped or strip-shaped casting body having a circular cross section and provided with an appropriate number of mortar through holes. The female engaging portion and the male engaging portion of the adjacent lining block are engaged with each other and arranged annularly on the inner surface of the manhole, between the inner lining block and the inner surface of the manhole, and in the mortar through hole. The manhole is characterized in that the exposed portion of the lining block lined in the manhole is covered with mortar.

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