JP5133378B2 - Rehabilitation method of sewer manhole and its manhole - Google Patents

Rehabilitation method of sewer manhole and its manhole Download PDF

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JP5133378B2
JP5133378B2 JP2010178571A JP2010178571A JP5133378B2 JP 5133378 B2 JP5133378 B2 JP 5133378B2 JP 2010178571 A JP2010178571 A JP 2010178571A JP 2010178571 A JP2010178571 A JP 2010178571A JP 5133378 B2 JP5133378 B2 JP 5133378B2
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manhole
mortar
lining
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勝 福原
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株式会社福原鋳物製作所
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Description

本発明は、下水道マンホールの更生方法とそのマンホールに関するものである。   The present invention relates to a method for rehabilitating a sewer manhole and the manhole.

コンクリート製マンホールの耐用年数は５０年程であるが、現在の下水道マンホールで既設年数が２０年以上経つものは、汚水から発生する硫化水素ガスなどによる腐食により、実際の耐用年数より早く劣化し、補強や交換が必要なマンホールが多く、問題となっている。   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.

これら劣化したマンホールの更生方法として、老朽したマンホールを洗浄後、マンホール内面にプライマーを塗布し、形状に合わせて加工したスペーサー付結合板をマンホール壁面に取付け、その内側に熱硬化樹脂を含浸させたマンホールライニング材をマンホールに挿入した後、そのマンホールライニング材を空気圧により膨らませ、次いで温水を満水状態にて循環させて熱硬化させ、マンホールライニング材硬化後、管口とインバート部の切断を行い、既設マンホールと結合板の間に充填剤を貫通し、マンホールライニング材と既設マンホール内面を結合させるというターヤン工法と称される更生方法が提案されている。   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.

この更生方法は、マンホールライニング材と既設マンホール内壁を結合板及び充填材で結合させることにより、複合マンホールを形成し、老朽化したマンホールを更生する技術であるが、上記の説明からわかるように、処理工程が煩雑で作業性が悪いばかりでなく、専用の用具や装置が必要であるという難点がある。   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.

２００７年度「下水道新技術研究所年報」〔要約版〕７４頁Fiscal 2007 Annual Report of New Institute for Sewerage Technology (Summary), p. 74

本発明は特別の工具や装置を必要とせず、施工を容易、且つ効率的に行うことができ、しかも同時に現在大きな問題となっている地震発生時のマンホールの浮上又は沈下防止効果があるマンホールの更生方法とそのマンホールを提供しようとするものである。   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.

本発明は上記の課題を解決するためになされたもので、請求項１記載の発明は、横断面が円弧状の板状又は短冊状の鋳物製の本体両側に、雌型係合部と雄型係合部を上下方向に設け、且つ適数のモルタル貫通孔を設けた内張り用ブロックを、隣接内張り用ブロックの雌型係合部と雄型係合部を係合させて、マンホールの内面に環状に配置し、これら内張り用ブロックとマンホール内面との間と、前記モルタル貫通孔にモルタルを流し込み、更にマンホールに内張りされた内張り用ブロックの露出部をモルタルで被覆することを特徴とするマンホールの更生方法である。   SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. The invention according to claim 1 is characterized in that a female engagement portion and a male engagement portion are formed on both sides of a plate-shaped or strip-shaped main body having a circular cross section. The inner surface of the manhole is formed by engaging a lining block provided with a mold engaging portion in the vertical direction and an appropriate number of mortar through holes with a female engaging portion and a male engaging portion of the adjacent lining block. A manhole characterized in that the mortar is disposed in an annular shape between the lining block and the inner surface of the manhole, the mortar is poured into the mortar through hole, and the exposed portion of the lining block lining the manhole is covered with mortar. This is the rehabilitation method.

請求項２記載の発明は、横断面が円弧状の板状又は短冊状の鋳物製の本体両側に、雌型係合部と雄型係合部を上下方向に設け、且つ適数のモルタル貫通孔を設けた内張り用ブロックを、隣接内張り用ブロックの雌型係合部と雄型係合部を係合させて、マンホールの内面に環状に配置し、これら内張り用ブロックとマンホール内面との間と、前記モルタル貫通孔にモルタルを流し込み、更にマンホールに内張りされた内張り用ブロックの露出部をモルタルで被覆したことを特徴とするマンホールである。   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.

前記請求項１記載の発明に係るマンホールの更生方法は、隣接内張りブロックの雌型係合部と雄型係合部を係合させて、マンホールの内面に環状に配置し、これら内張り用ブロックとマンホール内面との間と、前記モルタル貫通孔にモルタルを流し込み更にマンホールに内張りされた内張り用ブロックの露出部をモルタルで被覆して内張り用ブロックをマンホール内面に固定する作業を、下段から繰り返していくだけであるから、内張り作業、即ちマンホール更生作業を簡単に手順良く進めることができ、しかも特別な工具も装置も必要とせず工法として優れている。 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 process of pouring mortar between the inner surface of the manhole and the mortar through hole , covering the exposed portion of the lining block lined with the manhole with mortar, and fixing the lining block to the inner surface of the manhole is repeated from the lower stage. Therefore, the lining work, that is, the manhole renovation work can be easily performed with good procedures, and no special tools or devices are required, which is excellent as a construction method.

そして内張りされた内張り用ブロック同士は強固に一体化してマンホール内面に固定され、マンホールの更生を果たすとともに、内張り用ブロックを既設マンホールに付加したことによって、マンホールの見掛け比重を１以上にした場合は、劣化した既設マンホールは更生されると同時に、地震発生時の浮上又は沈下防止機能を付与されるという効果がある。   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.

また請求項２記載の発明は、鋳物製内張り用ブロックに耐蝕性を付与するため、モルタルを内面にも用いるようにしたものであり、施工は若干手間と簡単な環状型枠を要するが、マンホールの更生並びに地震発生時のマンホールの浮上又は沈下防止機能を付与することができる。 The invention of claim 2 uses mortar on the inner surface in order to give corrosion resistance to the casting lining block, and the construction requires a little labor and a simple annular formwork. Rehabilitation of the manhole and the function of preventing the manhole from rising or sinking when an earthquake occurs.

本発明の実施例の縦断面図。The longitudinal cross-sectional view of the Example of this invention. 図１の横断平面図。FIG. 2 is a cross-sectional plan view of FIG. 1. 本発明の実施例に用いた内張り用ブロックの斜視図。The perspective view of the block for lining used for the Example of this invention. 本発明の実施例の施工手順を示す説明図。Explanatory drawing which shows the construction procedure of the Example of this invention.

図１は請求項１記載の発明による更生を施した既設マンホールの縦断面図、図２はその横断平面図を示すもので、１は既設マンホール、２は内張り用ブロック、３は既設マンホール１と内張り用ブロック２間と、モルタル貫通孔５に流し込み、且つ内張り用ブロック２の内面を被覆したモルタル、４は下段と上段の内張り用ブロック間に挟んだブチルゴム製のシーリング材である。 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 A mortar 4 that flows between the lining blocks 2 and into the mortar through-hole 5 and covers the inner surface of the lining block 2 is a sealing material made of butyl rubber sandwiched between the lower and upper lining blocks.

既設マンホール１の更生に際しては、老朽化したマンホールの内面を洗浄後、内張り用ブロック２を隣接内張り用ブロック２，２のそれぞれの雌型係合部２ｃと雄型係合部２ｄを図２に示すように係合させてマンホール１の内側に環状に配置し、その内側に可撓性のモルタル止枠６を設置した後、モルタル３をマンホール１と内張り用ブロック２間及び内張り用ブロック２とモルタル止枠６間並びにモルタル貫通孔５に流し込み、モルタル３が固化した後、上段の内張り用ブロック２を１段目と同様に環状に連結して下段の内張り用ブロック上に載せ、先のモルタル止枠６を図４に示すように上方に移動させた後、モルタル３をマンホール１と内張り用ブロック間及びモルタル貫通孔５内並びに内張り用ブロックとモルタル止枠６間に流し込みモルタル３を固化させる。なお、４はブチルゴム製のシーリング材で、上段に内張り用ブロック２を載せる時に下段の内張り用ブロック２上に貼付するようにする。   When rehabilitating the existing manhole 1, after cleaning the inner surface of the aged manhole, the inner block 2 is replaced with the female engaging portion 2c and the male engaging portion 2d of each of the adjacent lining blocks 2 and 2, as shown in FIG. As shown in the figure, it is arranged in an annular shape inside the manhole 1 and a flexible mortar retaining frame 6 is installed on the inside, and then the mortar 3 is placed between the manhole 1 and the lining block 2 and the lining block 2. After the mortar 3 is solidified by pouring between the mortar retaining frames 6 and into the mortar through-hole 5, the upper lining block 2 is connected in a ring like the first tier and placed on the lower lining block. After the retaining frame 6 is moved upward as shown in FIG. 4, 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. Solidifying the mortar 3. 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.

内張り用ブロック２をマンホール１に結合させるためのモルタル３としては、耐酸性のある高炉水砕スラグ使用の無収縮モルタルが好ましい。この種のモルタルには早強、超早強、超々早強性等、硬化速度が種々異なるのものが市販されているので、内張り用ブロックの内張り所要時間に応じて選択して使用する。   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, so that the mortar is selected and used according to the time required for the lining of the lining block.

以上のように、作業手順は極めて簡単であり作業性に優れているので更生方法として好適である。   As described above, the work procedure is extremely simple and excellent in workability, and thus is suitable as a rehabilitation method.

そして、この内張り用ブロック２を内張りしたことによりマンホール１の強度を強化すると共に、マンホールの見掛け比重を１以上にした場合、劣化した既設マンホールの更生を果たすと同時に、地震発生時の浮上又は沈下防止機能が付与されることになる。   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.

以上の手順で内張り用ブロック２をマンホール１の内壁に内張りした場合、マンホール１間のモルタル３と、モルタル貫通孔５内のモルタル３と内張り用ブロック２の露出面を被覆するモルタル３とが一体となって、内張り用ブロック２をがっちりとマンホール１に固定させると同時に内張り用ブロック２の露出面を被覆するモルタル３の付着を強化し、その剥離を防止する効果がある。即ち、モルタル貫通孔５を設けたことにより、内張り用ブロックの両面を覆うモルタルをモルタル貫通孔５内に充填されたモルタルによって繋ぎ止める効果が得られる。なお、内張り用ブロック２の表面は、モルタル３との結合をよくするために粗面にしておくことが好ましい。   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 are integrated. Thus, 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 strengthened, 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.

また、以上の説明から容易に理解されるように、劣化したマンホール１の強度を補強すると共に、内面が新品同様に仕上がる特長がある。   Further, as can be easily understood from the above description, the strength of the deteriorated manhole 1 is reinforced and the inner surface is finished like a new product.

しかも、マンホール１に荷重することになるので、全体の見掛け比重を１以上となるように考慮することにより、地震発生時の浮上又は沈下防止機能を付与することが出来る。   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 マンホール
２ 内張り用ブロック
３ モルタル
４ シーリング材
５ モルタル貫通孔
６ モルタル止枠 1 Manhole 2 Liner Block 3 Mortar 4 Sealing Material 5 Mortar Through Hole 6 Mortar Retaining Frame

Claims (2)

横断面が円弧状の板状又は短冊状の鋳物製の本体両側に、雌型係合部と雄型係合部を上下方向に設け、且つ適数のモルタル貫通孔を設けた内張り用ブロックを、隣接内張り用ブロックの雌型係合部と雄型係合部を係合させて、マンホールの内面に環状に配置し、これら内張り用ブロックとマンホール内面との間と、前記モルタル貫通孔にモルタルを流し込み、更にマンホールに内張りされた内張り用ブロックの露出部をモルタルで被覆することを特徴とするマンホールの更生方法。 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. 横断面が円弧状の板状又は短冊状の鋳物製の本体両側に、雌型係合部と雄型係合部を上下方向に設け、且つ適数のモルタル貫通孔を設けた内張り用ブロックを、隣接内張り用ブロックの雌型係合部と雄型係合部を係合させて、マンホールの内面に環状に配置し、これら内張り用ブロックとマンホール内面との間と、前記モルタル貫通孔にモルタルを流し込み、更にマンホールに内張りされた内張り用ブロックの露出部をモルタルで被覆したことを特徴とするマンホール。 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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WO2014133417A1 (en) * 2013-03-01 2014-09-04 Grigoriev Georgy Petrovich Protective lining for repairing sewer manholes
JP6378662B2 (en) * 2015-04-30 2018-08-22 株式会社サンリツ Manhole levitation prevention device
JP6574723B2 (en) * 2016-02-25 2019-09-11 積水化学工業株式会社 Manhole rehabilitation method and rehabilitation manhole joint structure
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JP5064347B2 (en) * 2007-10-28 2012-10-31 株式会社福原鋳物製作所 Manhole rise prevention method and its manhole
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