JP7412275B2 - Rehabilitation pipe floating prevention device - Google Patents

Rehabilitation pipe floating prevention device Download PDF

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JP7412275B2
JP7412275B2 JP2020092141A JP2020092141A JP7412275B2 JP 7412275 B2 JP7412275 B2 JP 7412275B2 JP 2020092141 A JP2020092141 A JP 2020092141A JP 2020092141 A JP2020092141 A JP 2020092141A JP 7412275 B2 JP7412275 B2 JP 7412275B2
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pipe
rehabilitated
rehabilitated pipe
existing
support member
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JP2021188293A (en
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直弥 津田
康 北山
佳郎 杉山
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Sekisui Chemical Co Ltd
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Description

本発明は、既設管と既設管の内側にライニングされる更生管との間に裏込め材を充填する際に、更生管の浮上を防止する装置に関する。 The present invention relates to a device for preventing floating of a rehabilitated pipe when backfilling material is filled between an existing pipe and the rehabilitated pipe lined inside the existing pipe.

地中に埋設された下水管等の老朽化した既設管を更生するために、既設管の内側に更生管をライニングし、更生管と既設管との間に裏込め材を充填することは知られている。裏込め材の充填の際に、更生管に働く浮力や裏込め材の注入圧に起因して更生管が浮上したり変形したりするのを防止する装置が種々開発されている。 It is well known that in order to rehabilitate aging existing pipes such as sewer pipes buried underground, it is necessary to line the rehabilitated pipes inside the existing pipes and fill the gap between the rehabilitated pipes and the existing pipes with a backfilling material. It is being Various devices have been developed to prevent the rehabilitated pipe from floating or deforming due to the buoyant force acting on the rehabilitated pipe or the injection pressure of the backfilling material during filling with backfilling material.

特許文献１に開示されている浮上防止装置は、直線状に延びるジャッキ部付きの支保工と、底部腹起し部材とを備えている。底部腹起し部材は更生管の内側において更生管の管底に沿って延びている。支保工は更生管の管軸方向に間隔をおいて配置され、底部腹起し部材から垂直に立てられ、更生管の菅頂を貫通し、その上端が既設管の管頂に突き当たる。このように、支保工と底部腹起し部材で更生管の管底を固定することにより、裏込め材の充填時に更生管が浮上するのを防ぐことができる。 The floating prevention device disclosed in Patent Document 1 includes a support with a jack portion extending linearly, and a bottom raising member. The bottom raising member extends inside the rehabilitation pipe along the bottom of the rehabilitation pipe. The shoring is arranged at intervals in the axial direction of the rehabilitation pipe, stands vertically from the bottom raising member, penetrates the top of the rehabilitation pipe, and has its upper end abutted against the top of the existing pipe. In this way, by fixing the bottom of the rehabilitated pipe with the shoring and the bottom raising member, it is possible to prevent the rehabilitated pipe from floating up during filling with backfilling material.

特許文献２に開示されている浮上防止装置は、既設管と更生管の管頂間に配置される膨張体を備えている。この膨張体を膨張させることにより、更生管の菅頂を押さえ、さらに更生管の管底を既設管の管底に押し付ける。このようにして、裏込め材の充填時に更生管が浮上するのを防ぐ。 The floating prevention device disclosed in Patent Document 2 includes an expansion body disposed between the tops of an existing pipe and a rehabilitated pipe. By expanding this expansion body, the top of the rehabilitated pipe is pressed down, and the bottom of the rehabilitated pipe is further pressed against the bottom of the existing pipe. In this way, the rehabilitation pipe is prevented from floating when being filled with backfilling material.

特許文献３に開示されている浮上防止装置は、既設管と更生管の上弦部間の隙間に配置された円弧形状の支持部材を備えている。この支持部材は半円以上の角度範囲を有し、菅軸方向に間隔をおいて配置されている。この支持部材により裏込め材充填時の更生管の浮上と変形の防止を図っている。
特許文献４に開示されている浮上防止装置は、既設管と更生管の上弦部間の隙間に断面弧状の支持部材を備えており、この支持部材により、裏込め材充填時の更生管の浮上を防止している。この支持部材は菅軸方向に連続して配置されている。 The flotation prevention device disclosed in Patent Document 3 includes an arc-shaped support member disposed in the gap between the upper chord portions of the existing pipe and the rehabilitated pipe. The support members have an angular range of more than a semicircle and are arranged at intervals in the tube axis direction. This support member is intended to prevent floating and deformation of the rehabilitated pipe during filling with backfilling material.
The flotation prevention device disclosed in Patent Document 4 is equipped with a support member having an arc-shaped cross section in the gap between the upper chord of the existing pipe and the rehabilitated pipe, and this support member prevents the flotation of the rehabilitated pipe during filling with backfilling material. is prevented. This support member is arranged continuously in the tube axis direction.

特開２０１９－１８３６３２号公報JP 2019-183632 Publication 特開２０１４－１０９３６１号公報Japanese Patent Application Publication No. 2014-109361 特許６１７０５５６号公報Patent No. 6170556 特開平７－１００９２５号公報Japanese Patent Application Publication No. 7-100925

特許文献１の装置では、更生管に貫通穴を形成しなければならない。また、裏込め材の注入圧により更生管の断面形状が上下に潰れた楕円形に変形する傾向がある。
特許文献２の装置では、膨張体の押圧力で更生管の断面形状が上下方向に潰れた楕円形に変形する可能性がある。また、更生管を内側から支持していないので、裏込め材の注入圧によりさらに変形が進む可能性がある。さらに、裏込め材の充填時に更生管が管頂に位置する膨張体を支点として回転し易く更生管の支持が不安定である。 In the device of Patent Document 1, a through hole must be formed in the rehabilitated pipe. Furthermore, the cross-sectional shape of the rehabilitated pipe tends to deform into an elliptical shape with vertical collapse due to the injection pressure of the backfilling material.
In the device of Patent Document 2, the cross-sectional shape of the rehabilitation pipe may be deformed into an elliptical shape collapsed in the vertical direction due to the pressing force of the expansion body. Furthermore, since the rehabilitated pipe is not supported from the inside, there is a possibility that the deformation will progress further due to the injection pressure of the backfilling material. Furthermore, when filling with backfilling material, the rehabilitated pipe tends to rotate about the expanding body located at the top of the pipe as a fulcrum, making support of the rehabilitated pipe unstable.

特許文献３の装置では、円弧形状の支持部材が配置されている領域と配置されない領域で変形および浮上量が異なり、更生管内面に凹凸が生じる可能性がある。また、広い角度範囲の円弧形状をなす支持部材を必要とするため、コスト高となる。
特許文献４の装置では、支持部材は更生管の浮上防止の役割のみを担っており、更生管を内側から支持していないので、裏込め材の注入圧および浮力により、更生管の断面形状が変形する可能性がある。また、特殊形状の弧状部材を管軸方向に連続して配置するため、コスト高となる。 In the device of Patent Document 3, the deformation and floating amount are different between the region where the arc-shaped support member is arranged and the region where it is not arranged, and unevenness may occur on the inner surface of the rehabilitated tube. Further, since a support member having an arc shape with a wide angle range is required, the cost is high.
In the device of Patent Document 4, the support member only plays the role of preventing the rehabilitated pipe from floating, and does not support the rehabilitated pipe from the inside, so the cross-sectional shape of the rehabilitated pipe changes due to the injection pressure and buoyancy of the backfilling material. May be deformed. Furthermore, since the specially shaped arc-shaped members are arranged continuously in the tube axis direction, the cost is high.

上記課題を解決するために、本発明は、既設管と前記既設管の内側にライニングされた更生管との間に裏込め材を充填する際に、前記更生管の浮上を防止する装置において、
前記既設管の上弦部と前記更生管の上弦部との隙間に、前記既設管と前記更生管の管頂から互いに異なる方向に離れて配置され、管軸方向に延びる少なくとも一対の支持部材と、前記更生管の内側において前記更生管の管底に沿って延びる底部腹起し部材と、前記更生管の管軸方向に間隔をおいて配置された支保工と、を備え、前記支保工は、ジャッキ部を有し、前記底部腹起し部材から垂直に起立し、上端が前記更生管の管頂を押さえることを特徴とする。 In order to solve the above problems, the present invention provides an apparatus for preventing floating of the rehabilitated pipe when filling a backfilling material between an existing pipe and the rehabilitated pipe lined inside the existing pipe.
at least a pair of support members disposed in a gap between the upper chord part of the existing pipe and the upper chord part of the rehabilitated pipe, spaced apart in different directions from the pipe tops of the existing pipe and the rehabilitated pipe, and extending in the pipe axial direction; A bottom raising member extending along the bottom of the rehabilitated pipe inside the rehabilitated pipe, and shoring arranged at intervals in the axial direction of the rehabilitated pipe, the shoring comprising: It is characterized in that it has a jack part, stands vertically from the bottom raising member, and has an upper end that presses the top of the rehabilitated pipe.

上記構成によれば、裏込め材充填の際に、少なくとも一対の支持部材により更生管の浮上を防止できる。しかも、これら支持部材は更生管の管頂から互いに異なる方向に離れているので、更生管は菅頂を支点として回転することなく、更生管を安定して支持することができる。また、更生管の内側に配置された支保工と底部腹起し部材により、更生管の変形を菅軸方向にわたって抑制することができる。さらに、更生管に穴を開ける必要がなく、装置の構造も簡単かつ低コストである。 According to the above configuration, at least one pair of support members can prevent the rehabilitated pipe from floating when backfilling material is filled. Furthermore, since these support members are spaced apart from the top of the rehabilitated pipe in different directions, the rehabilitated pipe can stably support the rehabilitated pipe without rotating around the top of the pipe as a fulcrum. In addition, deformation of the rehabilitated pipe can be suppressed in the axial direction by the shoring and the bottom raising member arranged inside the rehabilitated pipe. Furthermore, there is no need to make holes in the rehabilitated pipe, and the structure of the device is simple and low cost.

好ましくは、前記支持部材が前記既設管の内面に固定されている。この構成によれば、支持部材を確実に所望位置に配置することができる。
具体的態様では、前記支持部材が異形鉄筋からなる。この構成によれば、セメントミルクやモルタル等からなる裏込め材との一体性、付着性を確保することができる。
他の具体的態様では、前記支持部材が、細長い袋状の網体と、前記網体に充填された充填材と、を有する。この構成によれば、更生管のライニング前に網体を既設管に設置し、ライニング後に網体に充填材を充填することが可能となり、ライニングの際に支持部材が邪魔にならない。 Preferably, the support member is fixed to the inner surface of the existing pipe. According to this configuration, the support member can be reliably placed at a desired position.
In a specific embodiment, the support member is made of deformed reinforcing bars. According to this configuration, integrity and adhesion with the backfilling material made of cement milk, mortar, etc. can be ensured.
In another specific embodiment, the support member includes an elongated bag-like net and a filler filled in the net. According to this configuration, it is possible to install the net on the existing pipe before lining the rehabilitated pipe and fill the net with filler after lining, so that the support member does not get in the way during lining.

好ましくは、さらに、前記更生管の管頂に沿って延びる頂部腹起し部材を備え、前記支保工の上端が前記頂部腹起し部材を介して前記更生管の管頂を押さえる。
上記構成によれば、底部腹起し部材と頂部腹起し部材と支保工が協働することにより、更生管の耐座屈強度を管軸方向にわたり高めることができる。 Preferably, the apparatus further includes a top raising member extending along the top of the rehabilitation pipe, and the upper end of the shoring presses the top of the rehabilitation pipe via the top raising member.
According to the above configuration, the buckling strength of the rehabilitated pipe can be increased in the pipe axis direction by the cooperation of the bottom raising member, the top raising member, and the support.

本発明の浮上防止装置によれば、簡単な構造で低コストでありながら、裏込め材充填の際に、更生管を安定して支持することができるとともに、更生管の浮上と変形を防止することができる。 According to the flotation prevention device of the present invention, while having a simple structure and low cost, it is possible to stably support a rehabilitated pipe during filling with backfill material, and prevent flotation and deformation of the rehabilitated pipe. be able to.

本発明の第１実施形態に係る浮上防止装置を、既設管および更生管とともに示す縦断面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows the floating prevention device based on 1st Embodiment of this invention, together with an existing pipe and a rehabilitated pipe. 図１のII-II線に沿う浮上防止装置の横断面図である。FIG. 2 is a cross-sectional view of the floating prevention device taken along line II-II in FIG. 1. FIG. 同浮上防止装置の支持部材の既設管への固定構造を示す拡大横断面図である。FIG. 3 is an enlarged cross-sectional view showing a structure for fixing a support member of the flotation prevention device to an existing pipe. 支持部材の既設管への固定構造の変形例を示す要部拡大縦断面図である。FIG. 7 is an enlarged vertical cross-sectional view of a main part showing a modification of the structure for fixing the support member to the existing pipe. （Ａ）～（Ｃ）は、本発明の第２実施形態に係る浮上防止装置の設置工程を、順を追って示す図２相当図である。(A) to (C) are views corresponding to FIG. 2 that sequentially show the installation process of the floating prevention device according to the second embodiment of the present invention. 同第２実施形態の浮上防止装置で用いられる支持部材の網体を示す斜視図である。It is a perspective view which shows the net of the support member used in the floating prevention device of the same 2nd Embodiment.

以下、本発明の第１実施形態を図１～図３を参照しながら説明する。
図１の符号１は、地中に埋設された下水管等の既設管を示す。老朽化した既設管１を更生するために、既設管１の内側に更生管２をライニングし、既設管１と更生管２との間にセメントミルクやモルタル等の裏込め材を充填する。 A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3.
Reference numeral 1 in FIG. 1 indicates an existing pipe such as a sewer pipe buried underground. In order to rehabilitate the aged existing pipe 1, a rehabilitated pipe 2 is lined inside the existing pipe 1, and a backfilling material such as cement milk or mortar is filled between the existing pipe 1 and the rehabilitated pipe 2.

図１、図２に示すように、裏込め材を充填するのに先立ち、更生管２が浮き上がったり変形したりするのを防止する浮上防止装置３が配置される。浮上防止装置３は、一対の支持部材１０と、上下２本の腹起し部材１５，１６と、支保工２０とを備えている。 As shown in FIGS. 1 and 2, prior to filling with backfilling material, a floating prevention device 3 is placed to prevent the rehabilitated pipe 2 from floating or being deformed. The floating prevention device 3 includes a pair of support members 10, two upper and lower raising members 15 and 16, and a support 20.

以下、浮上防止装置３の設置工程について説明する。
更生管２のライニング工程前に、既設管１の上弦部内面に既設管１の管軸方向に延びる一対の支持部材１０を固定する。図２に示すように、一対の支持部材１０は、既設管１の管軸方向から見て既設管１の菅頂から左右に同距離だけ離れている。既設管１の管軸を中心とする角度で記述すると、菅頂を０°とし、菅頂から時計回りを＋、反時計回りを－とした場合、一方の支持部材１０が＋Θ、他方の支持部材１０が－Θの角度位置にある。Θは５～４５°の範囲が好ましい。後述する裏込め材の充填時に更生管２に作用する浮力に対向するためである。本実施形態ではΘ＝１０°としたが、Θを４５°に可能な限り近づける（例えばΘ＝４０～４５°にする）と、更生後の既設管１に土圧が付与された時に、支持部材１０との当接箇所で発生する応力を低くすることができ、支持部材１０を起点とする既設管１のひび割れのリスクを低減することができる。 The installation process of the floating prevention device 3 will be explained below.
Before the lining process of the rehabilitated pipe 2, a pair of support members 10 extending in the axial direction of the existing pipe 1 are fixed to the inner surface of the upper chord part of the existing pipe 1. As shown in FIG. 2, the pair of support members 10 are spaced from the pipe top of the existing pipe 1 by the same distance in the left and right directions when viewed from the pipe axis direction of the existing pipe 1. When described in terms of angles centered on the pipe axis of the existing pipe 1, if the top of the tube is 0°, and clockwise from the top is + and counterclockwise is -, one support member 10 is +Θ and the other support Member 10 is in an angular position of -Θ. Θ is preferably in the range of 5 to 45°. This is to counter the buoyant force that acts on the rehabilitated pipe 2 during filling with backfilling material, which will be described later. In this embodiment, Θ = 10°, but if Θ is made as close as possible to 45° (for example, Θ = 40 to 45°), when earth pressure is applied to the existing pipe 1 after rehabilitation, the support The stress generated at the contact point with the member 10 can be reduced, and the risk of cracks in the existing pipe 1 starting from the support member 10 can be reduced.

セメントミルクやモルタルからなる裏込め材との一体性を確保するため、支持部材１０として、鉄やセメント系の部材を用いるのが好ましい。また、外力が作用した時に支持部材１０と裏込め材との界面の剥離を防ぎ付着性を確保するため、支持部材１０は表面に凹凸を有するものが好ましい。本実施形態では、異形鉄筋が用いられている。 In order to ensure integrity with the backfill material made of cement milk or mortar, it is preferable to use an iron or cement-based member as the support member 10. Further, in order to prevent separation of the interface between the support member 10 and the backfilling material when an external force is applied and ensure adhesion, the support member 10 preferably has an uneven surface. In this embodiment, deformed reinforcing bars are used.

支持部材１０は、既設管１の管軸方向に延びている。支持部材１０は既設管１の全長にわたって連続していてもよいが、既設管１の管軸方向に沿って複数本の支持部材１０を配置し、その端部をオーラ―ラップさせるようにしてもよい。また、これら複数本の支持部材１０がオーバーラップせず、例えば２００～３００ｍｍ以内であれば管軸方向に離れていてもよい。 The support member 10 extends in the axial direction of the existing pipe 1. The support members 10 may be continuous over the entire length of the existing pipe 1, but it is also possible to arrange a plurality of support members 10 along the axial direction of the existing pipe 1 and wrap the ends thereof. good. Further, the plurality of support members 10 may not overlap and may be separated in the tube axis direction, for example, as long as they are within 200 to 300 mm.

図３に示すように、支持部材１０は、菅軸方向に間隔をおいて固定構造１１により既設管１の内面に固定されている。固定構造１１は、既設管１に埋め込まれたアンカーボルト１２と、支持金具１３と、ナット１４とを有している。支持金具１３は、固定板部１３ａと、この固定板部１３ａに連なり円弧形状をなす支持板部１３ｂとを有している。支持金具１３は、支持板部１３ｂに支持部材１０を支持した状態で、固定板部１３ａを貫通するアンカーボルト１２にナット１４を螺合させて締め付けることにより、既設管１に固定される。 As shown in FIG. 3, the support members 10 are fixed to the inner surface of the existing pipe 1 by fixing structures 11 at intervals in the tube axis direction. The fixing structure 11 includes an anchor bolt 12 embedded in the existing pipe 1, a support fitting 13, and a nut 14. The support fitting 13 has a fixing plate part 13a and a support plate part 13b which is connected to the fixing plate part 13a and has an arc shape. The support fitting 13 is fixed to the existing pipe 1 by screwing and tightening a nut 14 onto an anchor bolt 12 passing through the fixing plate part 13a, with the support member 10 supported on the support plate part 13b.

既設管１の内面が崩落している場合、特に支持部材１０に対向する領域が崩落している場合には、支持部材１０の設置の前または後にセメント系材料で補修しておくのが好ましい。これにより、裏込め材充填工程において更生管２に浮力が働いた時に、反力を確実に得ることができる。 If the inner surface of the existing pipe 1 has collapsed, especially if the area facing the support member 10 has collapsed, it is preferable to repair it with a cement-based material before or after installing the support member 10. Thereby, when buoyancy acts on the rehabilitated pipe 2 in the backfilling material filling process, a reaction force can be reliably obtained.

上記支持部材１０が設置された後、既設管１の内側に更生管２をライニングする。このライニングには種々の方法がある。例えば長い筒を拡径することにより更生管２を形成してもよいし、帯状部材を螺旋状に巻いて隣接する巻き部分の側縁を嵌合させることにより更生管２を形成してもよい。 After the support member 10 is installed, the rehabilitated pipe 2 is lined inside the existing pipe 1. There are various methods for this lining. For example, the rehabilitated pipe 2 may be formed by enlarging the diameter of a long cylinder, or it may be formed by spirally winding a band-shaped member and fitting the side edges of adjacent wound parts. .

上記更生管２のライニングの結果、２本の支持部材１０が既設管１と更生管２との間に配置されることになる。上述のように帯状部材によって更生管２を形成する場合、帯状部材の側縁の嵌合部より帯状部材の主部を高くするのが好ましい。これにより、ライニングされた更生管２の帯状部材の主部を支持部材１０とほぼ接触させた状態にすることができる。なお、支持部材１０は必ずしも既設管１と更生管２に接触していなくてもよく、許容範囲であれば隙間が形成されていてもよい。 As a result of lining the rehabilitated pipe 2, two support members 10 are disposed between the existing pipe 1 and the rehabilitated pipe 2. When the rehabilitated pipe 2 is formed from a band-shaped member as described above, it is preferable that the main portion of the band-shaped member is higher than the fitting portion on the side edge of the band-shaped member. Thereby, the main portion of the band-like member of the lined rehabilitated pipe 2 can be brought into a state in which it is substantially in contact with the support member 10. Note that the support member 10 does not necessarily need to be in contact with the existing pipe 1 and the rehabilitated pipe 2, and a gap may be formed as long as it is within a permissible range.

次に、更生管２のライニング後に、腹起し部材１５，１６と、支保工２０を更生管２内に設置する。支保工２０は、更生管２の管軸に沿って間隔をおいて複数配置される。支保工２０は、直線状のパイプからなる突っ張り部材２１と、突っ張り部材２１の上端に固定されたコ字形の上側ベース部２２と、コ字形の下側ベース部２３と、突っ張り部材２１と下側ベース部２３との間に介在されたジャッキ部２４と、を有している。ジャッキ部２４は、下側ベース部２３に固定されて上方に垂直に突出し突っ張り部材２１の下端部に挿入されたネジ棒２４ａと、ネジ棒２４ａに螺合されて突っ張り部材２１の下端面に当たる取手付きの昇降部材２４ｂとを有している。昇降部材２４ｂを回して、突っ張り部材２１と下側ベース部２３との間隔を広げることにより、支保工２０の全長を伸ばすことができる。なお、ジャッキ部２４は、突っ張り部材２１と上側ベース部２２との間に配置されていてもよい。 Next, after lining the rehabilitated pipe 2, the raising members 15 and 16 and the shoring 20 are installed inside the rehabilitated pipe 2. A plurality of shoring structures 20 are arranged along the pipe axis of the rehabilitation pipe 2 at intervals. The shoring 20 includes a strut member 21 made of a straight pipe, a U-shaped upper base portion 22 fixed to the upper end of the strut member 21, a U-shaped lower base portion 23, a strut member 21, and a lower U-shaped base portion 22. The jack part 24 is interposed between the base part 23 and the jack part 24 . The jack part 24 includes a threaded rod 24a that is fixed to the lower base part 23, projects vertically upward, and is inserted into the lower end of the tension member 21, and a handle that is screwed onto the threaded rod 24a and touches the lower end surface of the tension member 21. It has an elevating member 24b with an attached elevating member 24b. The entire length of the shoring 20 can be extended by rotating the lifting member 24b to widen the distance between the strut member 21 and the lower base portion 23. Note that the jack portion 24 may be arranged between the tension member 21 and the upper base portion 22.

底部腹起し部材１６は、更生管２の菅底に配置され更生管２の全長にわたって連続して延びている。底部腹起し部材１６は所定長さに分割されており、菅軸方向に隣接する底部腹起し部材１６の端部同士が接合されている。これら端部は、相補形状の凹凸をなし、嵌合状態で接合するのが好ましい。これにより、互いに横ずれするのを防止することができる。底部腹起し部材１６は、アルミ製で中空をなしているので軽量であり、設置作業が容易である。 The bottom raising member 16 is arranged at the bottom of the rehabilitation pipe 2 and extends continuously over the entire length of the rehabilitation pipe 2. The bottom raising member 16 is divided into predetermined lengths, and the ends of the bottom raising members 16 adjacent in the tube axis direction are joined together. It is preferable that these end portions form concave and convex portions of complementary shapes and are joined in a fitted state. This can prevent them from shifting laterally. The bottom raising member 16 is made of aluminum and is hollow, so it is lightweight and easy to install.

支保工２０は、底部腹起し部材１６から垂直に起立している。支保工２０は、コ字形の下側ベース部２３に隣接する底部腹起し部材１６の端部を嵌めて、その継ぎ目部に載るようにして配置される。これにより、支保工２０の設置位置を正確に決定することができる。 The shoring 20 stands vertically from the bottom raising member 16. The shoring 20 is arranged so as to fit the end of the bottom raising member 16 adjacent to the U-shaped lower base portion 23 and rest on the joint portion thereof. Thereby, the installation position of the shoring 20 can be determined accurately.

頂部腹起し部材１５は、底部腹起し部材１６と同様の構成を有し、更生管２の菅頂に配置され更生管２の管軸に沿って連続して延びている。支保工２０の上側ベース部２２は、下側ベース部２３と同様にして、隣接する頂部腹起し部材１５の継ぎ目部に配置されている。 The top raising member 15 has the same configuration as the bottom raising member 16, is arranged at the top of the rehabilitation pipe 2, and extends continuously along the pipe axis of the rehabilitation pipe 2. The upper base part 22 of the shoring 20 is arranged at the joint part of the adjacent top raising members 15 in the same manner as the lower base part 23.

支保工２０は、ジャッキ部２４により伸長し、そのベース部２２，２３が上下の腹起し部材１５，１６を介して更生管２の菅頂と管底を押し付けることにより、突っ張り状態で垂直に維持される。 The shoring 20 is extended by the jack part 24, and the base parts 22 and 23 press against the top and bottom of the rehabilitation pipe 2 through the upper and lower raising members 15 and 16, so that the shoring 20 is stretched vertically in a taut state. maintained.

上記のように腹起し部材１５，１６と支保工２０を設置した後、既設管１と更生管２との間の隙間に裏込め材を充填する。この裏込め材の充填工程において、更生管２には浮力が働くが、管軸方向に延びる一対の支持部材１０により、更生管２の菅頂の上方への変位を、更生管２の長手方向にわたって防止することができる。また、支保工２０が管軸方向に延びる底部腹起し部材１６を介して更生管２管底を押さえているので、更生管２の管底の上方への変位を、更生管２の長手方向にわたって防止することができる。 After installing the raising members 15 and 16 and the shoring 20 as described above, the gap between the existing pipe 1 and the rehabilitated pipe 2 is filled with backfilling material. In this backfilling process, buoyancy acts on the rehabilitated pipe 2, but the pair of support members 10 extending in the pipe axis direction prevents the upward displacement of the pipe top of the rehabilitated pipe 2 in the longitudinal direction. It can be prevented for a long time. In addition, since the shoring 20 holds down the bottom of the rehabilitated pipe 2 via the bottom raising member 16 extending in the pipe axis direction, upward displacement of the bottom of the rehabilitated pipe 2 is prevented in the longitudinal direction of the rehabilitated pipe 2. It can be prevented for a long time.

上記のようにして更生管２の浮上を防止することができる。しかも、一対の支持部材１０が既設管１の菅頂から互いに異なる方向に離れて配置されているので、更生管２が浮力を受けて菅頂を支点として回るのを防止することができ、安定して更生管２を支持することができる。 As described above, floating of the rehabilitated pipe 2 can be prevented. Moreover, since the pair of support members 10 are arranged apart from each other in different directions from the top of the pipe 1, it is possible to prevent the rehabilitated pipe 2 from rotating around the top of the pipe as a fulcrum due to buoyancy, thereby making it stable. The rehabilitated pipe 2 can be supported.

更生管２には、浮力と裏込め材の注入圧により、上下に圧縮する方向の力が作用するが、この力を、間隔をおいて配置された支保工２０により受け止めることができ、更生管２の変形や座屈を防止することができる。しかも、支保工２０は、更生管２に作用する上下方向の力を菅軸方向に延びる上下の腹起し部材１５，１６を介して受け止めるので、更生管２の変形を菅軸方向にわたって防止することができ、耐座屈性を高めることができる。 A force that compresses the rehabilitated pipe 2 vertically due to the buoyancy and injection pressure of the backfill material acts on the rehabilitated pipe 2, but this force can be absorbed by the supports 20 placed at intervals, and the rehabilitated pipe 2 deformation and buckling can be prevented. Moreover, the shoring 20 receives the vertical force acting on the rehabilitated pipe 2 via the upper and lower raising members 15 and 16 extending in the pipe axis direction, thereby preventing deformation of the rehabilitated pipe 2 in the pipe axis direction. It is possible to improve buckling resistance.

上記実施形態において、更生管２の最外周が鉄等の補強部材で構成されている場合には、電食防止の観点から、支持部材１０や支持金具１３は塩化ビニル樹脂やエポキシ樹脂等でコーティングされることが好ましい。 In the above embodiment, when the outermost periphery of the rehabilitated pipe 2 is made of a reinforcing member such as iron, the supporting member 10 and the supporting metal fittings 13 are coated with vinyl chloride resin, epoxy resin, etc. from the viewpoint of preventing electrolytic corrosion. It is preferable that

図４は、異形鉄筋からなる支持部材１０の固定構造の変形例を示す。なお、支持部材１０の配置は上記実施形態と同様である。固定構造１１Ａは、支持部材１０に沿って間隔をおいて既設管１に打ち込まれた複数のコンクリートビス１８と、結束線１９とを有している。
コンクリートビス１８は、支持部材１０の横、すなわち支持部材１０と周方向に隣接して打ち込まれる。コンクリートビス１８の既設管１内面からの突出量は、支持部材１０の既設管１内面からの突出高さ未満である。 FIG. 4 shows a modification of the fixing structure of the support member 10 made of deformed reinforcing bars. Note that the arrangement of the support member 10 is the same as in the above embodiment. The fixed structure 11A includes a plurality of concrete screws 18 driven into the existing pipe 1 at intervals along the support member 10, and a binding wire 19.
The concrete screw 18 is driven next to the support member 10, that is, adjacent to the support member 10 in the circumferential direction. The amount of protrusion of the concrete screw 18 from the inner surface of the existing pipe 1 is less than the protrusion height of the supporting member 10 from the inner surface of the existing pipe 1.

コンクリートビス１８の打ち込み後に、結束線１９を用いて支持部材１０をコンクリートビス１８に結束する。なお、図４において結束線１９は形状を簡略化して破線で示す。
なお、更生管２の最外周が鉄等の補強部材で構成されている場合には、電食防止の観点から、支持部材１０のみならず結束線１９も塩化ビニル樹脂やエポキシ樹脂等でコーティングされることが好ましい。 After driving the concrete screws 18, the supporting member 10 is tied to the concrete screws 18 using a binding wire 19. In addition, in FIG. 4, the shape of the binding line 19 is simplified and shown as a broken line.
Note that when the outermost periphery of the rehabilitated pipe 2 is made of a reinforcing member such as iron, not only the support member 10 but also the binding wire 19 are coated with vinyl chloride resin, epoxy resin, etc. from the viewpoint of preventing electrolytic corrosion. It is preferable that

次に、本発明の第２実施形態について図５、図６を参照しながら説明する。本実施形態の浮上防止装置３Ａは、第１実施形態の浮上防止装置３の支持部材１０と異なる支持部材３０を用いるが、他の構成は第１実施形態と同様であるので、図中同番号を付してその詳細な説明を省略する。 Next, a second embodiment of the present invention will be described with reference to FIGS. 5 and 6. The flotation prevention device 3A of this embodiment uses a support member 30 different from the support member 10 of the flotation prevention device 3 of the first embodiment, but the other configuration is the same as that of the first embodiment, so the same number is used in the drawings. The detailed explanation will be omitted.

本実施形態の支持部材３０は、図６に示す網体３１を含む。この網体３１は、長尺の筒形状をなす平織金網からなる。この網体３１の一端３１ａは閉塞され，他端３１ｂが開口されている。なお、網体３１の長さは、後述する骨材入りセメント系材料３２の注入圧が高くなり過ぎないように、所定長さ例えば１０ｍに制約され、一般的な既設管１より短い。 The support member 30 of this embodiment includes a net body 31 shown in FIG. This mesh body 31 is made of a plain weave wire mesh having a long cylindrical shape. One end 31a of this net 31 is closed, and the other end 31b is open. The length of the mesh body 31 is limited to a predetermined length, for example, 10 m, and is shorter than the general existing pipe 1 so that the injection pressure of the aggregate-containing cement material 32 described later does not become too high.

第１工程では、更生管２のライニング前に、図５（Ａ）に示すように、既設管１の管頂から所定角度離れた箇所（第１実施形態参照）に、長さ１０ｍの一対の網体３１を管軸方向に間隔をおいて固定する。この固定構造は、例えばアンカーボルトと支持金具とナットからなる。 In the first step, before lining the rehabilitated pipe 2 , as shown in FIG. The mesh bodies 31 are fixed at intervals in the tube axis direction. This fixing structure consists of, for example, an anchor bolt, a support fitting, and a nut.

第２工程では、更生管２を１０ｍライニングする。
第３工程では、図５（Ｂ）に示すように、網体３１の開口端３１ｂから骨材入りセメント系材料３２（充填材）を充填する。これにより網体３１は膨らみ、更生管２の菅頂から所定角度離れた箇所を更生管２の外側から押さえる。注入したセメント系材料３２が封止端１ａまで達したら、開口端１ａを閉じる。なお、網体３１のメッシュ数は、セメント材料３２の骨材が通過しない程度に設定されている。 In the second step, the rehabilitated pipe 2 is lined by 10 m.
In the third step, as shown in FIG. 5(B), an aggregate-containing cement material 32 (filler) is filled from the open end 31b of the net body 31. As a result, the mesh body 31 swells and presses a portion of the rehabilitated pipe 2 at a predetermined angle away from the top of the pipe from the outside of the rehabilitated pipe 2. When the injected cement material 32 reaches the sealed end 1a, the open end 1a is closed. Note that the number of meshes of the net body 31 is set to such an extent that the aggregate of the cement material 32 does not pass through.

上記第１～第３工程を、既設管１の全長にわたって繰り返す。なお、既設管１の全長にわたって複数の網体３１を既設管１に固定した後（すなわち第１工程を完了させた後）、第２、第３工程を繰り返してもよい。 The above first to third steps are repeated over the entire length of the existing pipe 1. Note that after the plurality of mesh bodies 31 are fixed to the existing pipe 1 over the entire length of the existing pipe 1 (that is, after the first step is completed), the second and third steps may be repeated.

次に、図５（Ｃ）に示すように、更生管２内に腹起し部材１５，１６と支保工２０を設置する。 Next, as shown in FIG. 5(C), the raising members 15 and 16 and the shoring 20 are installed inside the rehabilitation pipe 2.

本発明は、前記実施形態に限定されるものではなく、その趣旨に反しない限りにおいて種々の改変をなすことができる。
頂部腹起し部材は省いてもよい。
既設管の上弦部と更生管の上弦部との間に複数対の支持部材を配置してもよい。 The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit thereof.
The top raising member may be omitted.
A plurality of pairs of support members may be arranged between the upper chord part of the existing pipe and the upper chord part of the rehabilitated pipe.

本発明は、地中に埋設された下水管等の更生に適用できる。 The present invention can be applied to the rehabilitation of underground sewer pipes, etc.

１ 既設管
２ 更生管
３、３Ａ 浮上防止装置
１０ 支持部材
１５ 頂部腹起し部材
１６ 底部腹起し部材
２０ 支保工
２１ 突っ張り部材
２２ 上側ベース部
２３ 下側ベース部
２４ ジャッキ部
３０ 支持部材
３１ 網体
３２ 骨材入りセメント系材料（充填材） 1 Existing pipe 2 Rehabilitation pipe 3, 3A Anti-surfacing device 10 Support member 15 Top raising member 16 Bottom raising member 20 Shoring 21 Tension member 22 Upper base part 23 Lower base part 24 Jack part 30 Support member 31 Net Body 32 Cement material containing aggregate (filling material)

Claims (4)

既設管と前記既設管の内側にライニングされた更生管との間に裏込め材を充填する際に、前記更生管の浮上を防止する装置において、
前記既設管の上弦部と前記更生管の上弦部との隙間に、前記既設管と前記更生管の管頂から互いに異なる方向に離れて配置され、管軸方向に延びる少なくとも一対の支持部材と、
前記更生管の内側において前記更生管の管底に沿って延びる底部腹起し部材と、
前記更生管の内側において前記更生管の管頂に沿って延びる頂部腹起し部材と、
前記更生管の管軸方向に間隔をおいて配置された支保工と、
を備え、
前記支保工は、ジャッキ部を有し、前記底部腹起し部材から垂直に起立し、上端が前記頂部腹起し部材を介して前記更生管の管頂を押さえることを特徴とする更生管の浮上防止装置。 In an apparatus for preventing floating of the rehabilitated pipe when filling a backfilling material between the existing pipe and the rehabilitated pipe lined inside the existing pipe,
at least a pair of support members disposed in a gap between the upper chord part of the existing pipe and the upper chord part of the rehabilitated pipe, spaced apart in different directions from the pipe tops of the existing pipe and the rehabilitated pipe, and extending in the pipe axial direction;
a bottom raising member extending along the bottom of the rehabilitated pipe inside the rehabilitated pipe;
a top raising member extending along the top of the rehabilitated pipe inside the rehabilitated pipe;
shoring arranged at intervals in the axial direction of the rehabilitated pipe;
Equipped with
The rehabilitation pipe is characterized in that the shoring has a jack part, stands vertically from the bottom raising member, and has an upper end pressing down on the top of the rehabilitated pipe via the top raising member. Anti-surfacing device. 前記支持部材が前記既設管の内面に固定されていることを特徴とする請求項１に記載の更生管の浮上防止装置。 The rehabilitation pipe floating prevention device according to claim 1, wherein the support member is fixed to an inner surface of the existing pipe. 前記支持部材が異形鉄筋からなる請求項１または２に記載の更生管の浮上防止装置。 The rehabilitation pipe floating prevention device according to claim 1 or 2, wherein the support member is made of deformed reinforcing bars. 前記支持部材が、細長い袋状の網体と、前記網体に充填された充填材と、を有することを特徴とする請求項１または２に記載の更生管の浮上防止装置。 3. The rehabilitation pipe floating prevention device according to claim 1, wherein the support member includes an elongated bag-like net and a filler filled in the net.
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