JP2017197941A - Manhole rehabilitation method and manhole rehabilitation structure - Google Patents

Manhole rehabilitation method and manhole rehabilitation structure Download PDF

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JP2017197941A
JP2017197941A JP2016088328A JP2016088328A JP2017197941A JP 2017197941 A JP2017197941 A JP 2017197941A JP 2016088328 A JP2016088328 A JP 2016088328A JP 2016088328 A JP2016088328 A JP 2016088328A JP 2017197941 A JP2017197941 A JP 2017197941A
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manhole
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cylindrical body
peripheral surface
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厚之介 柿添
Konosuke Kakizoe
厚之介 柿添
修二 山内
Shuji Yamauchi
修二 山内
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Abstract

PROBLEM TO BE SOLVED: To provide a manhole rehabilitation method and a manhole rehabilitation structure which can reconstruct a manhole with excellent workability and durability and shortening a construction period.SOLUTION: A manhole rehabilitation structure 300 comprises: a reinforcing cylindrical body 200 having a smaller outer diameter than an inner diameter of an existing manhole 100 which is inserted inside the existing manhole 100 in a standing posture; a back-filling material R included in the space between the inner peripheral surface of the existing manhole 100 and the outer peripheral surface of the reinforcing cylindrical body 200; a new invert 211 installed in the bottom of the reinforcing cylindrical body 200; a support foundation 10 arranged in a state of surrounding the existing manhole 100 on a ground G around the existing manhole 100 in the neighborhood of the upper edge part of the existing manhole 100; and an oblique wall block 22 placed on the support foundation 10. The reinforcing cylindrical body 200 is a synthetic resin cylindrical body 201 in which sand 202 is dispersedly fixed in the upper part of the outer peripheral surface.SELECTED DRAWING: Figure 9

Description

本発明は、長年の使用により老朽化したり、劣化したりした既設マンホールの機能を回復させるためのマンホール更生工法及びこれによって更生されたマンホール更生構造に関する。   The present invention relates to a manhole rehabilitation method for restoring the function of an existing manhole that has deteriorated or deteriorated due to long-term use, and a manhole rehabilitation structure rehabilitated thereby.

施工後、長年に亘る使用により老朽化したり、通過車両などから受ける荷重や振動などによって劣化したりしたマンホールを更生する工法については、従来、様々な技術が提案されているが、本発明に関連するものとして、例えば、特許文献１に記載された「マンホールの更生工法」などがある。   Various techniques have been proposed in the past for rehabilitating manholes that have become obsolete after use for many years after use or that have deteriorated due to loads or vibrations received from passing vehicles, etc. For example, there is a “manhole rehabilitation method” described in Patent Document 1.

特許文献１に記載された「マンホールの更生工法」は、既設のマンホールのインバート部を掘削して取り除いた後、このマンホール内に、底部が密閉された更生材を挿入し、加熱拡径してライニングし、この更生材の底部に新たなインバート部を再形成する、というものである。   The "manhole rehabilitation method" described in Patent Document 1 is to excavate and remove the inverted part of an existing manhole, and then insert a rehabilitation material with a sealed bottom into this manhole, and then expand the diameter by heating. Lining and re-forming a new invert part at the bottom of this rehabilitation material.

特開２００４−３２４０６０号公報JP 2004-324060 A

特許文献１に記載された「マンホールの更生工法」によって再構築されたマンホールの場合、マンホールの上方部分を形成するマンホール蓋、蓋支持リング及び斜壁ブロックなどの自重及び当該マンホール上を通過する車両などからの荷重や振動は既設マンホール及びその内部で熱拡径ライニングされた更生材に加わることとなる。   In the case of a manhole reconstructed by the “manhole rehabilitation method” described in Patent Literature 1, the manhole cover, the lid support ring, the slant wall block and the like that form the upper part of the manhole, and the vehicle passing over the manhole The load and vibration from the above will be applied to the existing manhole and the rehabilitated material that has been subjected to thermal expansion lining inside.

しかしながら、加熱拡径することにより既設マンホールの内周面にライニングされた更生材は厚みが薄く、剛性も極めて小さいので、マンホール上を通過する車両などからの荷重や振動の殆ど全てが既設マンホールに加わっている。このため、更生後のマンホールの耐久性は不足しており、延命効果が得られていないのが実状である。   However, the rehabilitation material lined on the inner peripheral surface of the existing manhole by expanding the diameter is thin and extremely rigid, so almost all the loads and vibrations from vehicles passing over the manhole are transferred to the existing manhole. Have joined. For this reason, the durability of the manhole after rehabilitation is insufficient, and the actual situation is that the life extension effect is not obtained.

そこで、本発明が解決しようとする課題は、作業性が良好で、工期が短く、耐久性に優れたマンホールを再構築することができるマンホール更生工法及びマンホール更生構造を提供することにある。   Therefore, the problem to be solved by the present invention is to provide a manhole rehabilitation method and a manhole rehabilitation structure that can reconstruct a manhole having good workability, a short construction period, and excellent durability.

本発明のマンホール更生工法は、
斜壁以上の部分及びインバートが撤去された前記既設マンホールの内部に、前記既設マンホールの内径より小さな外径を有する補強用筒状体を起立姿勢で挿入する工程と、
前記既設マンホールの内周面と、前記補強用筒状体の外周面と、の隙間に裏込め材を注入する工程と、
前記補強用筒状体の底部に新規インバートを打設する工程と、
前記既設マンホールの上縁部近傍の前記既設マンホールの周囲の地盤上に、前記既設マンホールの周囲を包囲する支持基礎を形成する工程と、
前記支持基礎上に斜壁ブロックを載置する工程と、を備え、
前記補強用筒状体が、
外周面の少なくとも一部に砂若しくは砂利が分散状に固着された合成樹脂筒状体、
または、外周面の少なくとも一部を腹巻状に包囲する金属製筒状体を有する合成樹脂筒状体であることを特徴とする。 The manhole rehabilitation method of the present invention is
A step of inserting a reinforcing cylindrical body having an outer diameter smaller than an inner diameter of the existing manhole in an upright posture into the existing manhole from which the invertor has been removed and the portion above the inclined wall;
Injecting a backfill material into the gap between the inner peripheral surface of the existing manhole and the outer peripheral surface of the reinforcing cylindrical body;
Placing a new invert on the bottom of the reinforcing tubular body;
Forming a support foundation surrounding the periphery of the existing manhole on the ground around the existing manhole near the upper edge of the existing manhole;
Placing a slanted wall block on the support foundation,
The reinforcing cylindrical body is
A synthetic resin cylinder in which sand or gravel is fixed in a dispersed manner on at least a part of the outer peripheral surface;
Or it is a synthetic resin cylindrical body which has a metal cylindrical body which surrounds at least one part of an outer peripheral surface in a bellows shape.

ここで、前記マンホール更生工法においては、前記支持基礎と地盤との間に、アラミド繊維製の補強部材を敷設する工程を設けることもできる。   Here, in the manhole rehabilitation method, a step of laying a reinforcing member made of aramid fiber may be provided between the support foundation and the ground.

また、前記マンホール更生工法においては、前記支持基礎と地盤との間に、Ｆｅ石灰を含む地盤改良材を打設する工程を設けることもできる。   Further, in the manhole rehabilitation method, a step of placing a ground improvement material containing Fe lime can be provided between the support foundation and the ground.

一方、前記マンホール更生工法においては、前記インバートの撤去から前記新規インバートの打設までの間に、前記既設マンホールの底部近傍に開設された流入管開口部と流出管開口部とを連通するバイパス経路を設けることもできる。   On the other hand, in the manhole rehabilitation method, between the removal of the invert and the placement of the new invert, a bypass path that connects the inflow pipe opening and the outflow pipe opening that are opened near the bottom of the existing manhole Can also be provided.

次に、本発明のマンホール更生構造は、
前記既設マンホールの内部に起立姿勢で挿入された、前記既設マンホールの内径より小さな外径を有する補強用筒状体と、
前記既設マンホールの内周面と、前記補強用筒状体の外周面と、の隙間に介在する裏込め材と、
前記補強用筒状体の底部に打設された新規インバートと、
前記既設マンホールの上縁部近傍の前記既設マンホールの周囲の地盤上に、前記既設マンホールの周囲を包囲する状態で配置された支持基礎と、
前記支持基礎上に載置された斜壁ブロックと、を備え、
前記補強用筒状体が、
外周面の少なくとも一部に砂若しくは砂利が分散状に固着された合成樹脂筒状体、
または、外周面の少なくとも一部を腹巻状に包囲する金属製筒状体を有する合成樹脂筒状体であることを特徴とする。 Next, the manhole rehabilitation structure of the present invention is
A reinforcing tubular body inserted in an upright position inside the existing manhole and having an outer diameter smaller than the inner diameter of the existing manhole;
A backfilling material interposed in a gap between the inner peripheral surface of the existing manhole and the outer peripheral surface of the reinforcing cylindrical body;
A new invert placed at the bottom of the reinforcing tubular body;
On the ground around the existing manhole in the vicinity of the upper edge of the existing manhole, a support foundation arranged to surround the existing manhole,
A slanted wall block placed on the support foundation,
The reinforcing cylindrical body is
A synthetic resin cylinder in which sand or gravel is fixed in a dispersed manner on at least a part of the outer peripheral surface;
Or it is a synthetic resin cylindrical body which has a metal cylindrical body which surrounds at least one part of an outer peripheral surface in a bellows shape.

また、前記マンホール更生構造においては、前記支持基礎と前記地盤との間に、アラミド繊維製の補強部材を配置することもできる。   In the manhole rehabilitation structure, a reinforcing member made of aramid fiber may be disposed between the support foundation and the ground.

さらに、前記マンホール更生構造においては、前記支持基礎と地盤との間に、Ｆｅ石灰を含む地盤改良材を配置することもできる。   Furthermore, in the said manhole rehabilitation structure, the ground improvement material containing Fe lime can also be arrange | positioned between the said support foundation and the ground.

本発明により、作業性が良好で、工期が短く、耐久性に優れたマンホールを再構築することができるマンホール更生工法及びマンホール更生構造を提供することができる。   According to the present invention, it is possible to provide a manhole rehabilitation method and a manhole rehabilitation structure that can reconstruct a manhole having good workability, a short work period, and excellent durability.

本発明の実施形態であるマンホール更生工法を既設マンホールに対して実施している途中の状態を示す垂直断面図である。It is a vertical sectional view which shows the state in the middle of implementing the manhole renovation method which is embodiment of this invention with respect to the existing manhole. 本発明の実施形態であるマンホール更生工法を既設マンホールに対して実施している途中の状態を示す垂直断面図である。It is a vertical sectional view which shows the state in the middle of implementing the manhole renovation method which is embodiment of this invention with respect to the existing manhole. 本発明の実施形態であるマンホール更生工法を既設マンホールに対して実施している途中の状態を示す垂直断面図である。It is a vertical sectional view which shows the state in the middle of implementing the manhole renovation method which is embodiment of this invention with respect to the existing manhole. 本発明の実施形態であるマンホール更生工法を既設マンホールに対して実施している途中の状態を示す垂直断面図である。It is a vertical sectional view which shows the state in the middle of implementing the manhole renovation method which is embodiment of this invention with respect to the existing manhole. 本発明の実施形態であるマンホール更生工法を既設マンホールに対して実施している途中の状態を示す垂直断面図である。It is a vertical sectional view which shows the state in the middle of implementing the manhole renovation method which is embodiment of this invention with respect to the existing manhole. 本発明の実施形態であるマンホール更生工法を既設マンホールに対して実施している途中の状態を示す垂直断面図である。It is a vertical sectional view which shows the state in the middle of implementing the manhole renovation method which is embodiment of this invention with respect to the existing manhole. 本発明の実施形態であるマンホール更生工法を既設マンホールに対して実施している途中の状態を示す垂直断面図である。It is a vertical sectional view which shows the state in the middle of implementing the manhole renovation method which is embodiment of this invention with respect to the existing manhole. 本発明の実施形態であるマンホール更生工法を既設マンホールに対して実施している途中の状態を示す垂直断面図である。It is a vertical sectional view which shows the state in the middle of implementing the manhole renovation method which is embodiment of this invention with respect to the existing manhole. 本発明の実施形態であるマンホール更生工法によって更生されたマンホール更生構造を示す垂直断面図である。It is a vertical sectional view showing a manhole rehabilitation structure rehabilitated by a manhole rehabilitation method which is an embodiment of the present invention. 本発明の実施形態であるマンホール更生工法を既設マンホールに対して実施している途中の状態を示す垂直断面図である。It is a vertical sectional view which shows the state in the middle of implementing the manhole renovation method which is embodiment of this invention with respect to the existing manhole. 図１０中に示すパッカの正面図である。It is a front view of the packer shown in FIG. 本発明のその他の実施形態であるマンホール更生構造を示す垂直断面図である。It is a vertical sectional view showing a manhole rehabilitation structure which is another embodiment of the present invention. 本発明のその他の実施形態であるマンホール更生構造を示す垂直断面図である。It is a vertical sectional view showing a manhole rehabilitation structure which is another embodiment of the present invention. 図１３中の矢線Ｘで示す領域の拡大図である。FIG. 14 is an enlarged view of a region indicated by an arrow X in FIG. 13. 本発明のその他の実施形態であるマンホール更生工法を既設マンホールに対して実施している途中の状態を示す垂直断面図である。It is a vertical sectional view which shows the state in the middle of implementing the manhole renovation method which is other embodiment of this invention with respect to the existing manhole. 図１５に示すマンホール更生工法によって更生されたマンホール更生構造を示す垂直断面図である。It is a vertical sectional view showing a manhole rehabilitation structure rehabilitated by the manhole rehabilitation method shown in FIG.

図１〜図１１に基づいて、本発明の実施形態であるマンホール更生工法及びマンホール更生構造について説明する。なお、図１〜図９は本実施形態のマンホール更生工法の施工の順序に沿って並んでいる。   A manhole rehabilitation method and a manhole rehabilitation structure which are embodiments of the present invention will be described with reference to FIGS. 1 to 9 are arranged in the order of construction of the manhole rehabilitation method of the present embodiment.

図１に示すように、既設マンホール１００は、地盤Ｇ中に形成された栗石・砕石基礎ＳＢ上に配置された既設底版１０１と、既設底版１０１上に配置された管取付壁１０２と、管取付壁１０２上に複数の直壁部材１０３，１０４を順次、直列状に接続して形成された直壁１０５と、直壁部材１０４上に接続された斜壁１０６と、斜壁１０６上に取り付けられた調整リング１０７と、調整リング１０７上に調整モルタル１０８を介して設置された受枠１０９と、受枠１０９内に嵌入された鉄蓋１１０と、を備えている。既設底版１０１上にはインバート１１１が配置されている。   As shown in FIG. 1, the existing manhole 100 includes an existing bottom plate 101 disposed on the crushed stone / crushed stone foundation SB formed in the ground G, a pipe mounting wall 102 disposed on the existing bottom plate 101, and a pipe mounting. A straight wall 105 formed by sequentially connecting a plurality of straight wall members 103 and 104 in series on the wall 102, a slant wall 106 connected on the straight wall member 104, and a slant wall 106. Adjustment ring 107, receiving frame 109 installed on adjustment ring 107 via adjustment mortar 108, and iron lid 110 fitted into receiving frame 109. An invert 111 is arranged on the existing bottom plate 101.

図１に示すように、既設マンホール１００の鉄蓋１１０の受枠１０９の周縁部から所定距離（例えば、４０ｃｍ〜１００ｃｍ程度）だけ離れた位置の地表面（舗装面）ＧＳから地盤Ｇ中に向かって、土留め用の鋼矢板ＳＰを圧入し、受枠１０９の周りを複数の鋼矢板ＳＰで囲繞された、受枠１０９の周りの舗装層及び土砂などを掘削して既設マンホール１００の斜壁１０６以上の部分（斜壁１０６、調整リング１０７、調整モルタル１０８及び受枠１０９）を露出させる。   As shown in FIG. 1, from the ground surface (paved surface) GS at a predetermined distance (for example, about 40 cm to 100 cm) away from the peripheral edge of the receiving frame 109 of the iron lid 110 of the existing manhole 100, toward the ground G. The steel sheet pile SP for retaining the earth is press-fitted, and the pavement layer and earth and sand around the receiving frame 109, which are surrounded by the steel sheet pile SP around the receiving frame 109, are excavated and more than the inclined wall 106 of the existing manhole 100 The portions (the inclined wall 106, the adjustment ring 107, the adjustment mortar 108, and the receiving frame 109) are exposed.

次に、図２に示すように、既設マンホール１００の斜壁１０６以上の部分（斜壁１０６、調整リング１０７、調整モルタル１０８及び受枠１０９）を撤去する。これにより、直壁１０５の最上部に位置する直壁部材１０４が露出した状態となる。   Next, as shown in FIG. 2, the portions of the existing manhole 100 beyond the inclined wall 106 (the inclined wall 106, the adjusting ring 107, the adjusting mortar 108 and the receiving frame 109) are removed. As a result, the straight wall member 104 located at the top of the straight wall 105 is exposed.

次に、図３に示すように、既設マンホール１００の直壁１０５を形成する直壁部材１０４，１０３の内周面１０４ｆ，１０３ｆ及び管取付壁１０２の内周面１０２ｆ（図２参照）を所定厚さだけ切削する。この場合、切削する厚さは限定しないので、施工現場の状況に応じて決めることができるが、例えば、５ｍｍ〜１０ｍｍ程度が望ましい。   Next, as shown in FIG. 3, the inner peripheral surfaces 104f and 103f of the straight wall members 104 and 103 forming the straight wall 105 of the existing manhole 100 and the inner peripheral surface 102f (see FIG. 2) of the pipe mounting wall 102 are predetermined. Cut only the thickness. In this case, since the thickness to cut is not limited, it can be determined according to the situation at the construction site, but is preferably about 5 mm to 10 mm, for example.

これにより、図３に示すように、直壁部材１０３，１０４の内側及び管取付壁１０２の内側には、元の内周面１０４ｆ，１０３ｆ，１０２ｆより面粗度の粗い内周面１０４ｇ，１０３ｇ，１０２ｇが形成される。また、既設マンホール１００の内部の既設底版１０１上に配置されているインバート１１１（図２参照）を撤去し、既設底版１０１の上面１０１ａを露出させる。   As a result, as shown in FIG. 3, the inner peripheral surfaces 104g, 103g having a rougher surface roughness than the original inner peripheral surfaces 104f, 103f, 102f are formed on the inner side of the straight wall members 103, 104 and the inner side of the pipe mounting wall 102. , 102g are formed. Moreover, the invert 111 (refer FIG. 2) arrange | positioned on the existing bottom plate 101 inside the existing manhole 100 is removed, and the upper surface 101a of the existing bottom plate 101 is exposed.

次に、図４に示すように、既設マンホール１００の内部に、既設マンホール１００の内径より小さな外径を有する補強用筒状体２００を起立姿勢で挿入し、その下端部２００ａを既設底版１０１の上面１０１ａに当接させた状態とする。補強用筒状体２００は、横断面が円形状の合成樹脂筒状体２０１と、その外周面全体に分散状に固着された多数の砂２０２とを備えている。この場合、補強用筒状体２００の合成樹脂筒状体２０１に開設された倒立Ｕ字状の削孔部２１２の内部に既設管Ｐが嵌まり込むように位置合わせし、補強用筒状体２００を既設底版１０１上に配置する。なお、図４などにおいては、砂２０２の存在を明確化するため、砂２０２の粒径を実際の粒径より大きく表示している。   Next, as shown in FIG. 4, the reinforcing cylindrical body 200 having an outer diameter smaller than the inner diameter of the existing manhole 100 is inserted into the existing manhole 100 in an upright posture, and the lower end 200 a of the existing bottom plate 101 is The state is in contact with the upper surface 101a. The reinforcing cylindrical body 200 includes a synthetic resin cylindrical body 201 having a circular cross section and a large number of sands 202 fixed in a distributed manner on the entire outer peripheral surface thereof. In this case, the reinforcing tubular body 200 is positioned so that the existing pipe P fits inside the inverted U-shaped hole 212 provided in the synthetic resin tubular body 201 of the reinforcing tubular body 201. 200 is placed on the existing bottom plate 101. In FIG. 4 and the like, the particle size of the sand 202 is displayed larger than the actual particle size in order to clarify the presence of the sand 202.

次に、図５に示すように、既設マンホール１００の内周面１０２ｇ，１０３ｇ，１０４ｇと、補強用筒状体２００の外周面２００ｂと、の隙間に裏込め材Ｒを注入する。裏込め材Ｒは、セメント系モルタルあるいは樹脂系モルタルなどが好適であるが、これらに限定するものではない。なお、既設マンホール１００の上縁部１０４ａの高さと補強用筒状体２００の上縁部２００ｃの高さ及び裏込め材Ｒの上面部Ｒ１は同一高さであることが望ましい。   Next, as shown in FIG. 5, the backfill material R is injected into the gap between the inner peripheral surfaces 102 g, 103 g, 104 g of the existing manhole 100 and the outer peripheral surface 200 b of the reinforcing cylindrical body 200. The backfill material R is preferably cement-based mortar or resin-based mortar, but is not limited thereto. Note that the height of the upper edge portion 104a of the existing manhole 100, the height of the upper edge portion 200c of the reinforcing cylindrical body 200, and the upper surface portion R1 of the backfill material R are preferably the same height.

また、裏込め材Ｒが隙間内に空隙なく充填されたら、図５に示すように、既設底版１０１の上面１０１ａに新設インバート２１１を形成する。新設インバート２１１の上面には、既設管Ｐと連通する状態で、垂直断面がＵ字状の流路２１１ａが形成されている。   When the backfill material R is filled in the gap without any gap, a new invert 211 is formed on the upper surface 101a of the existing bottom plate 101 as shown in FIG. On the upper surface of the newly installed invert 211, a flow path 211 a having a U-shaped vertical cross section is formed in communication with the existing pipe P.

次に、図６に示すように、既設マンホール１００の上縁部１０４ａ近傍の既設マンホール１００の周囲の地盤Ｇ上に、既設マンホール１００の周囲を包囲する環状の支持基礎１０を形成する。また、既設マンホール１００の上縁部１０４ａ、補強用筒状体２００の上縁部２００ｃ及び裏込め材Ｒの上面部Ｒ１に水膨張性ゴム１２を仮固定する。   Next, as shown in FIG. 6, an annular support foundation 10 that surrounds the periphery of the existing manhole 100 is formed on the ground G around the existing manhole 100 in the vicinity of the upper edge portion 104 a of the existing manhole 100. Further, the water-expandable rubber 12 is temporarily fixed to the upper edge portion 104a of the existing manhole 100, the upper edge portion 200c of the reinforcing cylindrical body 200, and the upper surface portion R1 of the backfill material R.

次に、図７に示すように、支持基礎１０上に環状のコンクリート支持体２０を載置した後、このコンクリート支持体２０上に、底版ブロック２１を載置する。底版ブロック２１には、補強用筒状体２００の内径と同内径の開口部２１ａが開設されている。底版ブロック２１の開口部２１ａの内周面には、合成樹脂製の内面被覆材２１ｂが貼着されている。コンクリート支持体２０の上面と、底版ブロック２１の下面との間には、水膨張性ゴムによる止水シールＷＰが設けられている。   Next, as shown in FIG. 7, after the annular concrete support 20 is placed on the support foundation 10, the bottom block 21 is placed on the concrete support 20. The bottom plate block 21 is provided with an opening 21 a having the same inner diameter as that of the reinforcing cylindrical body 200. An inner surface covering material 21b made of a synthetic resin is attached to the inner peripheral surface of the opening 21a of the bottom block 21. Between the upper surface of the concrete support 20 and the lower surface of the bottom block 21, a water-stop seal WP made of water-expandable rubber is provided.

次に、図８に示すように、底版ブロック２１の上面に、コンクリート製の斜壁ブロック２２を取り付け、この斜壁ブロック２２の開口部２２ａに、蓋支持リング２３，２３及びマンホール蓋２４を取り付ける。斜壁ブロック２２の内周面及び蓋支持リング２３，２３の内周面には、それぞれ合成樹脂製の内面被覆材２２ｂ，２３ｂ，２３ｂが貼着されている。   Next, as shown in FIG. 8, a concrete inclined wall block 22 is attached to the upper surface of the bottom slab block 21, and lid support rings 23 and 23 and a manhole cover 24 are attached to the opening 22 a of the inclined wall block 22. . Synthetic resin inner surface covering materials 22b, 23b, and 23b are attached to the inner peripheral surface of the inclined wall block 22 and the inner peripheral surfaces of the lid support rings 23 and 23, respectively.

この後、周囲の鋼矢板ＳＰを撤去し、コンクリート支持体２０、底版ブロック２１、斜壁ブロック２２などの周りを埋戻し、マンホール蓋２４の上面と同一面をなすように舗装を施せば、マンホール更生工事が終了し、図９に示すような、マンホール更生構造３００が完成する。   Thereafter, the surrounding steel sheet pile SP is removed, the surroundings of the concrete support 20, the bottom slab block 21, the slanted wall block 22 and the like are backfilled, and paved so as to be flush with the upper surface of the manhole cover 24. The rehabilitation work is completed, and a manhole rehabilitation structure 300 as shown in FIG. 9 is completed.

マンホール更生構造３００においては、横断面が円形状の合成樹脂筒状体２０１と、その外周面全体に分散状に固着された多数の砂２０２とを備えた補強用筒状体２００を使用している。このため、補強用筒状体２００の外周面２００ｂと裏込め材Ｒとの密着性が極めて良好であり、補強用筒状体２００と既設マンホール１００とを強固に接続することができる。なお、補強用筒状体２００は、合成樹脂筒状体２０１の外周面に接着剤を塗布した後、砂２０２を均一に分散した状態で貼着（接着）することによって形成しているが、これに限定する物ではない。また、砂２０２よりも粒径の大きな砂利を使用することもできる。   The manhole rehabilitation structure 300 uses a reinforcing cylindrical body 200 including a synthetic resin cylindrical body 201 having a circular cross section and a large number of sands 202 fixed in a distributed manner on the entire outer peripheral surface thereof. Yes. For this reason, the adhesiveness between the outer peripheral surface 200b of the reinforcing cylindrical body 200 and the backfilling material R is extremely good, and the reinforcing cylindrical body 200 and the existing manhole 100 can be firmly connected. The reinforcing cylindrical body 200 is formed by applying an adhesive to the outer peripheral surface of the synthetic resin cylindrical body 201 and then sticking (adhering) the sand 202 in a uniformly dispersed state. This is not a limitation. Also, gravel having a particle size larger than that of the sand 202 can be used.

また、本実施形態のマンホール更生工法は、既設マンホールの下半部分を残した状態で工事を行うので、作業性が良好であり、工期も短い。また、裏込め材Ｒによって一体化された補強用筒状体２００と既設マンホール１００とは剛性が高く、車両の荷重や振動による劣化が少ないので、耐久性に優れたマンホールを再構築することができる   In addition, the manhole rehabilitation method of the present embodiment performs the work with the lower half of the existing manhole remaining, so that the workability is good and the construction period is short. In addition, the reinforcing cylindrical body 200 integrated with the backfill material R and the existing manhole 100 have high rigidity and little deterioration due to the load and vibration of the vehicle. Therefore, it is possible to reconstruct a manhole having excellent durability. it can

次に、図１０は、前述したマンホール更生工法において、既設のインバート１１１（図２参照）を撤去して、新設インバート２１１（図５参照）を打設するまでの間に、前記既設マンホール１００の底部近傍に開設された既設の流入管ＩＰの開口部と流出管ＯＰの開口部とを連通するバイパス経路３０を設けた状態を示している。   Next, FIG. 10 is a schematic view of the manhole rehabilitation method described above, after the existing invert 111 (see FIG. 2) is removed and a new invert 211 (see FIG. 5) is placed. The state which provided the bypass path | route 30 which connects the opening part of the existing inflow pipe IP opened near the bottom part and the opening part of the outflow pipe OP is shown.

図１０に示すように、バイパス経路３０は、流入管ＩＰの開口部及び流出管ＯＰの開口部にそれぞれ着脱可能に挿着されたドラム形状のパッカ３１と、パッカ３１の端面に開設された開口部３１ａに接続されたホース３２と、を備えている。   As shown in FIG. 10, the bypass path 30 includes a drum-shaped packer 31 that is detachably inserted into the opening of the inflow pipe IP and the opening of the outflow pipe OP, and an opening that is opened on the end surface of the packer 31. Hose 32 connected to part 31a.

図１１に示すように、パッカ３１の両端にはそれぞれ複数の開口部３１ａが設けられているので、施工現場の状況に応じて適切な位置にある開口部３１ａを選択してホース３２を接続することができる。   As shown in FIG. 11, a plurality of openings 31 a are provided at both ends of the packer 31, so the opening 31 a at an appropriate position is selected according to the situation at the construction site and the hose 32 is connected. be able to.

図１０に示すように、バイパス経路３０を設ければ、流入管ＩＰの開口部から流出管ＯＰの開口部に向かって汚水を迂回させて流すことが可能となり、作業環境をドライに保つことができるため、作業効率が向上する。また、供用中の汚水を止めることなく、施工が可能となるため、工期の短縮化にも有効である。   As shown in FIG. 10, if the bypass path 30 is provided, it becomes possible to divert sewage from the opening of the inflow pipe IP to the opening of the outflow pipe OP, and to keep the working environment dry. This improves work efficiency. In addition, construction is possible without stopping sewage in service, which is effective for shortening the construction period.

次に、図１２〜図１６に基づいて、本発明のその他の実施形態であるマンホール更生構造４００，５００，６００について説明する。なお、マンホール更生構造４００，５００，６００において、前述したマンホール更生構造３００と共通する部分については、図１〜図９中に示す記号と同符号を付して説明を省略する。   Next, based on FIGS. 12-16, the manhole renovation structure 400,500,600 which is other embodiment of this invention is demonstrated. In the manhole rehabilitation structure 400, 500, 600, portions common to the manhole rehabilitation structure 300 described above are denoted by the same reference numerals as those shown in FIGS. 1 to 9 and description thereof is omitted.

図１２に示す、マンホール更生構造４００においては、支持基礎１０の下面側と地盤Ｇとの間に、ドーナツ円板状のアラミド繊維製の補強部材４０が敷設されている。支持基礎１０は砕石基礎となっており、通常はマンホールを埋め戻す際に良質土に入れ替えてあることが殆どであり、砕石基礎である支持基礎１０によって輪荷重を十分に支持することができる。しかしながら、軟質な土質が見込まれる現場の場合、支持基礎１０の下面側にアラミド繊維製の補強部材４０を敷設すれば、土圧の均一な載荷を実現することができ、コンクリート支持体２０などの沈下を防止することができる。   In the manhole rehabilitation structure 400 shown in FIG. 12, a reinforcing member 40 made of an aramid fiber having a donut disk shape is laid between the lower surface side of the support foundation 10 and the ground G. The support foundation 10 is a crushed stone foundation and is usually replaced with high-quality soil when the manhole is backfilled, and the wheel load can be sufficiently supported by the support foundation 10 which is a crushed stone foundation. However, in the case of a site where soft soil is expected, if a reinforcing member 40 made of aramid fiber is laid on the lower surface side of the support foundation 10, uniform loading of earth pressure can be realized. Settlement can be prevented.

図１２に示すマンホール更生構造４００においても、コンクリート支持体２０の上面と、床版ブロック２１の下面との間には、水膨張性ゴムによる止水シールＷＰが設けられている。また、底版ブロック２１の内周面、斜壁ブロック２２の内周面及び蓋支持リング２３，２３の内周面には、それぞれ合成樹脂製の内面被覆材２１ｂ，２２ｂ，２３ｂ，２３ｂが貼着されている。なお、以下に示す実施形態においても、図１３〜図１６に示すように、所定個所に、それぞれ合成樹脂製の内面被覆材２１ｂ，２２ｂ，２３ｂ，２３ｂが貼着され、止水シールＷＰが設けられている。   Also in the manhole rehabilitation structure 400 shown in FIG. 12, a water-stop seal WP made of water-expandable rubber is provided between the upper surface of the concrete support 20 and the lower surface of the floor slab block 21. Further, inner surface covering materials 21b, 22b, 23b, and 23b made of synthetic resin are attached to the inner peripheral surface of the bottom block 21, the inner peripheral surface of the inclined wall block 22, and the inner peripheral surfaces of the lid support rings 23 and 23, respectively. Has been. In the embodiment described below, as shown in FIGS. 13 to 16, synthetic resin inner surface covering materials 21 b, 22 b, 23 b, and 23 b are attached to predetermined portions, respectively, and a water stop seal WP is provided. It has been.

次に、図１３，図１４に示すマンホール更生構造５００においては、既設マンホール１００の内部に補強用筒状体５０が起立姿勢で挿入されている。補強用筒状体５０は、合成樹脂筒状体５１と、合成樹脂筒状体５１の外周面の上方部分を腹巻状に包囲する金属製筒状体５２と、を備えている。合成樹脂筒状体５１の外周面と金属製筒状体５２の内周面とは接着剤によって固着されている。金属製筒状体５２はステンレス鋼製であるが、これに限定するものではない。   Next, in the manhole rehabilitation structure 500 shown in FIGS. 13 and 14, the reinforcing tubular body 50 is inserted into the existing manhole 100 in a standing posture. The reinforcing tubular body 50 includes a synthetic resin tubular body 51 and a metal tubular body 52 that surrounds an upper portion of the outer peripheral surface of the synthetic resin tubular body 51 in a bellows shape. The outer peripheral surface of the synthetic resin cylindrical body 51 and the inner peripheral surface of the metal cylindrical body 52 are fixed by an adhesive. The metal cylindrical body 52 is made of stainless steel, but is not limited thereto.

図１４に示すように、支持基礎１０に加わる荷重により、支持基礎１０の下方の地盤Ｇには矢線で示すような土圧が発生するが、特に矢線Ｔで示すような土圧は、既設マンホール１００及びその内部の補強用筒状体５０に圧力を加えることとなる。そこで、本実施形態のマンホール更生構造５００においては、合成樹脂筒状体５１の外周面を金属製筒状体５２で包囲した補強用筒状体５０を既設マンホール１００の内部に挿入し、裏込め材Ｒで両者を一体化することにより、土圧に対抗可能な強度を確保している。   As shown in FIG. 14, due to the load applied to the support foundation 10, earth pressure as indicated by an arrow line is generated on the ground G below the support foundation 10, but especially earth pressure as indicated by the arrow line T is Pressure is applied to the existing manhole 100 and the reinforcing tubular body 50 inside thereof. Therefore, in the manhole rehabilitation structure 500 according to the present embodiment, the reinforcing cylindrical body 50 in which the outer peripheral surface of the synthetic resin cylindrical body 51 is surrounded by the metal cylindrical body 52 is inserted into the existing manhole 100 and backfilled. By integrating both with the material R, the strength capable of resisting earth pressure is secured.

なお、合成樹脂筒状体５１の外周面において、金属製筒状体５２を配置する部分は、特に限定するものではないが、支持基礎１０で包囲された領域及びその少し鉛直下方の領域を含む部分が好適である。   In addition, although the part which arrange | positions the metal cylindrical body 52 in the outer peripheral surface of the synthetic resin cylindrical body 51 is not specifically limited, The area | region enclosed by the support foundation 10 and the area | region of the some vertically lower part are included. Part is preferred.

次に、図１５，図１６に示すマンホール更生構造６００について説明する。通常のマンホールは、躯体とマンホール蓋の内径差を解消するために斜壁ブロック２２（図８参照）が使用されている。しかしながら、何らかの条件により、斜壁２２を使用しない状況が考えられるが、そのような場合に適しているのが、図１５，図１６に示すマンホール更生構造６００である。   Next, the manhole rehabilitation structure 600 shown in FIGS. 15 and 16 will be described. In a normal manhole, a slanted wall block 22 (see FIG. 8) is used to eliminate the difference in inner diameter between the housing and the manhole cover. However, there is a situation where the inclined wall 22 is not used due to some condition, but the manhole rehabilitation structure 600 shown in FIGS. 15 and 16 is suitable for such a case.

図１５，図１６に示すマンホール更生構造６００においては、斜壁が存在しないので、ブロック体６０が、より舗装面（地表面）ＧＳに近い状態となり、その分だけ、既設マンホール１００の直壁部分とブロック体６０との間のスペースが増大する。既設マンホール１００内に挿入される補強用筒状体６１の上縁部６１ａはブロック体６０近くまで到達するが、斜壁が存在しない分だけ、補強用筒状体６１の周囲に既設マンホール１００の直壁部分が存在しない状態となる。   In the manhole rehabilitation structure 600 shown in FIG. 15 and FIG. 16, since there is no inclined wall, the block body 60 becomes closer to the pavement surface (ground surface) GS, and the straight wall portion of the existing manhole 100 correspondingly. And the block body 60 increase in space. The upper edge 61a of the reinforcing cylindrical body 61 inserted into the existing manhole 100 reaches near the block body 60, but the existing manhole 100 is surrounded around the reinforcing cylindrical body 61 by the amount of no slant wall. There is no straight wall portion.

そこで、マンホール更生構造６００においては、補強用筒状体６１の周囲の既設マンホール１００の直壁部分が存在しない部分（既設マンホール１００の上縁部１００ａから上方に突出する補強用筒状体６１の周囲の部分）を、改良土であるＦｅ石灰６２で埋め戻すことにより強固な地盤を形成し、上部からの載荷重を負担させ、且つ、既設マンホール１００の直壁の連続性がなくなる部分を補完している。   Therefore, in the manhole rehabilitation structure 600, a portion where the straight wall portion of the existing manhole 100 around the reinforcing cylindrical body 61 does not exist (the reinforcing cylindrical body 61 protruding upward from the upper edge portion 100a of the existing manhole 100 is provided. The surrounding area) is backfilled with improved soil Fe lime 62 to form a strong ground, bearing the loading load from the top, and complementing the portion where the continuity of the straight wall of the existing manhole 100 is lost doing.

なお、図１〜図１６に基づいて説明したマンホール更生工法及びマンホール更生構造３００，４０，５００，６００は、本発明のマンホール更生工法及びマンホール更生構造を例示するものであり、本発明のマンホール更生工法及びマンホール更生構造は、前述したマンホール更生工法及びマンホール更生構造３００，４００，５００，６００に限定されるものではない。   The manhole rehabilitation method and the manhole rehabilitation structure 300, 40, 500, 600 described with reference to FIGS. 1 to 16 illustrate the manhole rehabilitation method and the manhole rehabilitation structure of the present invention. The construction method and the manhole rehabilitation structure are not limited to the manhole rehabilitation method and the manhole rehabilitation structure 300, 400, 500, 600 described above.

本発明に係るマンホール更生工法及びマンホール更生構造は、長年の使用などにより老朽化したり、劣化したりした既設マンホールの機能を更生する技術として、土木建設業などの産業分野において広く利用することができる。   The manhole rehabilitation method and the manhole rehabilitation structure according to the present invention can be widely used in industrial fields such as civil engineering as a technology for rehabilitating the function of existing manholes that have been aged or deteriorated due to long-term use, etc. .

１０ 支持基礎
１２ 水膨張性ゴム
２０ コンクリート支持体
２１ 底版ブロック
２１ａ，２２ａ，３１ａ 開口部
２１ｂ，２２ｂ，２３ｂ 内面被覆材
２２ 斜壁ブロック
２３ 蓋支持リング
２４ マンホール蓋
３０ バイパス経路
３１ パッカ
３２ ホース
４０ 補強部材
５０，６１ 補強用筒状体
５１，２０１ 合成樹脂筒状体
５２ 金属製筒状体
６０ ブロック体
６１ａ，２００ｃ 上縁部
６２ Ｆｅ石灰
１００ 既設マンホール
１０１ 既設底版
１０１ａ，２０１ａ，２０７ａ 上面
１０２，２０２ 管取付壁
１０２ａ，２０２ａ 壁体部
１０２ｆ，１０２ｇ，１０３ｆ，１０３ｇ，１０４ｆ，１０４ｇ 内周面
１０３，１０４，２０３，２０４ 直壁部材
１０４ａ，１００ａ 上縁部
１０５ 直壁
１０６ 斜壁
１０７ 調整リング
１０８ 調整モルタル
１０９ 受枠
１１０ 鉄蓋
１１１，２１１ インバート
１１１ａ，２１１ａ 流路
１１２，２１２ 削孔部
２００ 補強用筒状体
２００ａ 下端部
２００ｂ 外周面
２０２ 砂
３００，４００，５００，６００ マンホール更生構造
Ｇ 地盤
ＧＳ 地表面（舗装面）
ＩＰ 流入管
ＯＰ 流出管
Ｐ 既設管
Ｒ 裏込め材
Ｒ１ 上面部
ＳＢ 栗石・砕石基礎
ＳＰ 鋼矢板
ＷＰ 止水シール DESCRIPTION OF SYMBOLS 10 Support foundation 12 Water expansible rubber 20 Concrete support 21 Bottom plate block 21a, 22a, 31a Opening part 21b, 22b, 23b Inner surface covering material 22 Oblique wall block 23 Lid support ring 24 Manhole cover 30 Bypass path 31 Packer 32 Hose 40 Reinforcement Members 50, 61 Reinforcing cylindrical body 51, 201 Synthetic resin cylindrical body 52 Metal cylindrical body 60 Block body 61a, 200c Upper edge 62 Fe lime 100 Existing manhole 101 Existing bottom plate 101a, 201a, 207a Upper surface 102, 202 Pipe mounting wall 102a, 202a Wall body portion 102f, 102g, 103f, 103g, 104f, 104g Inner peripheral surface 103, 104, 203, 204 Straight wall member 104a, 100a Upper edge portion 105 Straight wall 106 Slanted wall 107 Adjustment ring 108 Adjustment mortar 109 Receiving frame 110 Iron lid 111, 211 Invert 111a, 211a Flow path 112, 212 Drilling part 200 Reinforcing cylindrical body 200a Lower end part 200b Outer peripheral surface 202 Sand 300, 400, 500, 600 Manhole rehabilitation structure G Ground GS Ground surface ( Paved surface)
IP Inflow pipe OP Outflow pipe P Existing pipe R Backfill material R1 Top surface SB Kuriishi and crushed stone foundation SP Steel sheet pile WP Water stop seal

Claims (7)

斜壁以上の部分及びインバートが撤去された既設マンホールの内部に、前記既設マンホールの内径より小さな外径を有する補強用筒状体を起立姿勢で挿入する工程と、
前記既設マンホールの内周面と、前記補強用筒状体の外周面と、の隙間に裏込め材を注入する工程と、
前記補強用筒状体の底部に新規インバートを打設する工程と、
前記既設マンホールの上縁部近傍の前記既設マンホールの周囲の地盤上に、前記既設マンホールの周囲を包囲する支持基礎を形成する工程と、
前記支持基礎上に斜壁ブロックを載置する工程と、を備えたマンホール更生工法であって、
前記補強用筒状体が、
外周面の少なくとも一部に砂若しくは砂利が分散状に固着された合成樹脂筒状体、
または、外周面の少なくとも一部を腹巻状に包囲する金属製筒状体を有する合成樹脂筒状体であるマンホール更生工法。 Inserting a reinforcing cylindrical body having an outer diameter smaller than the inner diameter of the existing manhole in an upright position inside the existing manhole from which the invertor has been removed from the inclined wall and above, and
Injecting a backfill material into the gap between the inner peripheral surface of the existing manhole and the outer peripheral surface of the reinforcing cylindrical body;
Placing a new invert on the bottom of the reinforcing tubular body;
Forming a support foundation surrounding the periphery of the existing manhole on the ground around the existing manhole near the upper edge of the existing manhole;
A manhole rehabilitation method comprising a step of placing an inclined wall block on the support foundation,
The reinforcing cylindrical body is
A synthetic resin cylinder in which sand or gravel is fixed in a dispersed manner on at least a part of the outer peripheral surface;
Or the manhole rehabilitation method which is a synthetic resin cylindrical body which has a metal cylindrical body which surrounds at least one part of an outer peripheral surface in a bellows shape. 前記支持基礎と地盤との間に、アラミド繊維製の補強部材を敷設する工程を備えた請求項１記載のマンホール更生工法。   The manhole rehabilitation method according to claim 1, further comprising a step of laying a reinforcing member made of aramid fiber between the support foundation and the ground. 前記支持基礎と地盤との間に、Ｆｅ石灰を含む地盤改良材を打設する工程を備えた請求項１記載のマンホール更生工法。   The manhole rehabilitation method according to claim 1, further comprising a step of placing a ground improvement material containing Fe lime between the support foundation and the ground. 前記インバートの撤去から前記新規インバートの打設までの間に、前記既設マンホールの底部近傍に開設された流入管開口部と流出管開口部とを連通するバイパス経路を備えた請求項１〜３のいずれかに記載のマンホール更生工法。   The bypass path which connects the inflow pipe opening part and the outflow pipe opening part which were established in the bottom part vicinity of the said existing manhole between removal of the said invert and placement of the said new invert is provided. The manhole rehabilitation method described in any one. 既設マンホールの内部に起立姿勢で挿入された、前記既設マンホールの内径より小さな外径を有する補強用筒状体と、
前記既設マンホールの内周面と、前記補強用筒状体の外周面と、の隙間に介在する裏込め材と、
前記補強用筒状体の底部に打設された新規インバートと、
前記既設マンホールの上縁部近傍の前記既設マンホールの周囲の地盤上に、前記既設マンホールの周囲を包囲する状態で配置された支持基礎と、
前記支持基礎上に載置された斜壁ブロックと、を備えたマンホール更生構造であって、
前記補強用筒状体が、
外周面の少なくとも一部に砂若しくは砂利が分散状に固着された合成樹脂筒状体、
または、外周面の少なくとも一部を腹巻状に包囲する金属製筒状体を有する合成樹脂筒状体であるマンホール更生構造。 A reinforcing tubular body inserted in an upright position inside the existing manhole, and having an outer diameter smaller than the inner diameter of the existing manhole;
A backfilling material interposed in a gap between the inner peripheral surface of the existing manhole and the outer peripheral surface of the reinforcing cylindrical body;
A new invert placed at the bottom of the reinforcing tubular body;
On the ground around the existing manhole in the vicinity of the upper edge of the existing manhole, a support foundation arranged to surround the existing manhole,
A manhole rehabilitation structure comprising an inclined wall block placed on the support foundation,
The reinforcing cylindrical body is
A synthetic resin cylinder in which sand or gravel is fixed in a dispersed manner on at least a part of the outer peripheral surface;
Or the manhole rehabilitation structure which is a synthetic resin cylinder which has a metal cylinder which surrounds at least one part of an outer peripheral surface in a belly-wrap shape. 前記支持基礎と地盤との間に、アラミド繊維製の補強部材が配置された請求項５記載のマンホール更生構造。   The manhole rehabilitation structure according to claim 5, wherein a reinforcing member made of aramid fiber is disposed between the support foundation and the ground. 前記支持基礎と地盤との間に、Ｆｅ石灰を含む地盤改良材が配置された請求項５記載のマンホール更生構造。   The manhole rehabilitation structure according to claim 5, wherein a ground improvement material containing Fe lime is disposed between the support foundation and the ground.
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