JP2008019679A - Hole drilling method, and method of constructing water collecting well - Google Patents

Hole drilling method, and method of constructing water collecting well Download PDF

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JP2008019679A
JP2008019679A JP2006194449A JP2006194449A JP2008019679A JP 2008019679 A JP2008019679 A JP 2008019679A JP 2006194449 A JP2006194449 A JP 2006194449A JP 2006194449 A JP2006194449 A JP 2006194449A JP 2008019679 A JP2008019679 A JP 2008019679A
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jack
hole
segment ring
segment
jig
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JP4932358B2 (en
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Mitsuo Saito
光男 斉藤
Yutaka Okubo
豊 大久保
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NISSOO KK
Ishikawajima Kenzai Kogyo Co Ltd
Ishikawajima Construction Materials Co Ltd
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NISSOO KK
Ishikawajima Kenzai Kogyo Co Ltd
Ishikawajima Construction Materials Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To make a jack unit relatively small and light to facilitate construction operation and drill a hole at a low cost to construct a water collecting well. <P>SOLUTION: The jack unit 28 is placed on a support 23 disposed on the inner surface of a steel cutter 20 having a cutting edge 22 on its front end, and segment rings 12 are mounted in multiple stages at the upside of the jack unit 28 which houses a jack 24 that can come out of and retreat into a spacer 29. The spacer 29 of the jack unit 28 is attached to the head segment ring 12A, and the jack 24 is caused to project from the spacer 29 to push the support 23 which causes the steel cutter 20 to execute primary drilling. After the retreat of the jack 24, a reaction plate 33 is fitted between the spacer 29 and a cylinder. An outer cylinder 25 is supplied with hydraulic pressure generate reaction force on the reaction plate 33 which causes the outer cylinder 25 to extend down with respect to the cylinder, thus bringing the steel cutter 20 into secondary drilling operation via the support 23. The jack unit 28 is then retreated to attach a new segment between the jack unit 28 and the segment ring 12A. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、集水井等の設備を構築する穴の掘削方法と穴を掘削しながら穴内に集水井を構築するようにした集水井の施工方法に関する。   The present invention relates to a hole excavation method for constructing facilities such as a drainage well and a drainage well construction method for constructing a drainage well in a hole while excavating the hole.

従来、大雨や長雨等で地表から地下に多くの水が染み込んで地下水が流れ込む。増水した地下水等によって傾斜地やがけ等の地盤が崩壊したり滑り面より上層の地層が滑り落ちることで、地滑り現象が発生する。このような地滑りが発生すると、その下方に位置する集落や道路等の施設や設備が埋まったり押しつぶされたりするおそれがある。
このような地滑りを防止する手段として集水井が採用されている。集水井は筒状の縦穴を地表から地中に形成しながら穴内にセグメントリングを順次施工して形成する。そして、周囲の地下水を集水井に誘導して貯水させ、集水井の下部からダムや水路、河川等、滑り面から離れた領域に水を誘導して排出している。これにより地中で地下水の水位が増大しないようにして地滑りや土砂崩れ等を抑制できる。
集水井は例えば上下方向に掘削された縦穴の内面に例えば円弧状のセグメントを周方向に接合してなるセグメントリングを深さ方向に多段に連結させて形成している。この集水井は上部のセグメントリングを地表より若干上方に突出させ、地表面周囲に打設したコンクリート等で固定保持されている。
Conventionally, a lot of water soaks into the ground from the surface due to heavy rain or long rain, and groundwater flows. The landslide phenomenon occurs when the ground such as sloped land or rubble collapses due to the increased groundwater or the ground layer above the sliding surface slides down. When such a landslide occurs, there is a risk that facilities and equipment such as villages and roads located therebelow will be buried or crushed.
Catchment wells are adopted as means for preventing such landslides. The drainage well is formed by sequentially forming segment rings in the hole while forming a cylindrical vertical hole from the surface to the ground. Then, surrounding groundwater is guided to the collecting well and stored, and the water is guided and discharged from the lower part of the collecting well to areas away from the sliding surface, such as dams, waterways, and rivers. Thereby, landslides and landslides can be suppressed without increasing the groundwater level in the ground.
For example, the drainage well is formed by connecting segment rings formed by joining, for example, arc-shaped segments in the circumferential direction to the inner surface of a vertical hole excavated in the vertical direction in multiple stages in the depth direction. The drainage well is fixedly held by concrete or the like placed around the ground surface with the upper segment ring protruding slightly above the ground surface.

このような集水井を構築する方法として自沈式工法と逆巻き工法とが提案されている。自沈式工法は複数のコンクリート製セグメントをリング状に構築したセグメントリングに上から荷重を加えて降下させ、順次セグメントリングを多段に積層して筒状に構築するものであるが、セグメントリングが地中深く進行するとセグメントリングの周囲に加わる地盤の土圧が大きくなり、それ以上は自沈できなくなる欠点がある。また、地中が柔らかい場合には多段のセグメントリングが地中に吊られている状態になって抜け落ちてしまうこともあった。   As a method for constructing such a drainage well, a self-sinking method and a reverse winding method have been proposed. In the self-sinking method, a load is applied to the segment ring constructed of a plurality of concrete segments in a ring shape and lowered, and the segment rings are sequentially stacked in multiple stages to construct a cylindrical shape. If you proceed deeper, the earth pressure applied to the periphery of the segment ring will increase, and beyond that, there will be a drawback that it will not be able to settle. In addition, when the ground is soft, the multi-stage segment ring may be suspended in the ground and fall off.

これに対し、逆巻き工法は例えば特許文献1に記載されており、図12に示すように、地表面に逆円錐台形状の発進穴1を掘削し、その底面に略筒状の鋼製刃口2を載置する。鋼製刃口2の先端には切刃3が形成されている。鋼製刃口2の内面に突出させた受け部2a上にジャッキ4を所定間隔で設置し、その上に複数のRCセグメント5からなるセグメントリング6を多段に接続して筒状に形成する。発進穴1の底部にはズレ止めコンクリートを打設し、地表面にはセグメントリング6を固定保持する固定コンクリート7を打設しておく。
そして、図13に示すように、ジャッキ4をセグメントリング6の先端面で反力を受けるようにして伸張させて鋼製刃口2を下方に押して地盤を掘削して縦穴を穿孔する。その後セグメントリング6の先端面からジャッキ4を収縮させる。セグメントリング6の先端面と収縮されたジャッキ4との間に形成されたリング状の空間Sには、集水井8の上部開口から重機等によってワイヤで吊したセグメント5を降下させて嵌め込み、セグメントリング6の先端面と新たなセグメント5とを継手で接合する。そして複数のセグメント5を周方向に継手接合することで新たなセグメントリング6を構築する。このようにして掘削した縦穴内に順次下方にセグメントリング6を接合して集水井8を構築する。
特開平3−72194号公報
On the other hand, the reverse winding method is described in, for example, Patent Document 1, and as shown in FIG. 12, a reverse truncated cone-shaped start hole 1 is excavated on the ground surface, and a substantially cylindrical steel blade is formed on the bottom surface thereof. 2 is placed. A cutting blade 3 is formed at the tip of the steel blade 2. The jacks 4 are installed at predetermined intervals on the receiving portions 2a projected from the inner surface of the steel blade edge 2, and segment rings 6 composed of a plurality of RC segments 5 are connected in multiple stages to form a cylindrical shape. Anti-displacement concrete is cast at the bottom of the start hole 1, and fixed concrete 7 for fixing and holding the segment ring 6 is cast on the ground surface.
Then, as shown in FIG. 13, the jack 4 is stretched so as to receive a reaction force at the front end surface of the segment ring 6, and the steel blade 2 is pushed downward to excavate the ground to drill a vertical hole. Thereafter, the jack 4 is contracted from the front end surface of the segment ring 6. In the ring-shaped space S formed between the distal end surface of the segment ring 6 and the contracted jack 4, the segment 5 suspended by a wire from the upper opening of the drainage well 8 by a heavy machine is lowered and fitted. The front end surface of the ring 6 and the new segment 5 are joined by a joint. Then, a new segment ring 6 is constructed by joint-joining the plurality of segments 5 in the circumferential direction. The drainage well 8 is constructed by sequentially joining the segment rings 6 downward in the vertical holes thus excavated.
Japanese Patent Laid-Open No. 3-72194

ところで、ジャッキ4をセグメントリング6の先端面と鋼製刃口2の受け部2aとの間で伸縮して新たなセグメントリング6を装着する空間Sを形成するためには、ジャッキ4を収縮した際にセグメントリング6の中心軸O方向の幅に相当する空間Sを形成しなければならない。そのため、ジャッキ4が収縮した状態でその長さがセグメント5の幅に相当する長さを有していなければならず、ジャッキ4の1ストローク分の飛び出し量がセグメント5の幅以上なければならなかった。
そのため、ジャッキ4が大型化してその重量が数百Kg以上に増大し、しかもジャッキ4を重機で吊して移動させるために大型の重機が必要になり、手間がかかる上にコスト高になる欠点があった。またジャッキ4は油圧で伸縮するために油圧供給及び排出用のホースが接続されており、ジャッキ4の伸縮ストロークが長いために伸縮移動が煩雑で多量の油圧を必要とするという欠点もある。
本発明は、このような実情に鑑みて、ジャッキを比較的小型軽量化して操作を容易にすると共に低コストにした穴の掘削方法及び集水井の施工方法を提供することを目的とする。
By the way, in order to form the space S in which the new segment ring 6 is mounted by expanding and contracting the jack 4 between the distal end surface of the segment ring 6 and the receiving portion 2a of the steel blade edge 2, the jack 4 is contracted. In this case, a space S corresponding to the width of the segment ring 6 in the direction of the central axis O must be formed. Therefore, when the jack 4 is contracted, its length must have a length corresponding to the width of the segment 5, and the amount of protrusion of one stroke of the jack 4 must be greater than the width of the segment 5. It was.
For this reason, the jack 4 is increased in size and its weight increases to several hundred kg or more, and a large heavy machine is required to suspend and move the jack 4 with a heavy machine, which is troublesome and costly. was there. Further, since the jack 4 is expanded and contracted by a hydraulic pressure, a hydraulic supply / discharge hose is connected, and the expansion / contraction movement of the jack 4 is complicated and a large amount of hydraulic pressure is required.
In view of such circumstances, an object of the present invention is to provide a method for excavating a hole and a method for constructing a drainage well, in which a jack is relatively reduced in size and weight for easy operation and low cost.

本発明による穴の施工方法は、先端に切刃を有すると共にその内面に受け部を有する掘削用治具に対し、ジャッキ部によって前記受け部を押動することで穴を掘削し、該穴内に複数のセグメントを接合したセグメントリングを多段に接合するようにした穴の掘削方法であって、先に施工した前記セグメントリングにジャッキ部のジャッキを進退可能に収納したスペーサを取付け、該スペーサからジャッキを突出させて受け部を押すことで掘削用治具で穴を掘削し、ジャッキ部のスペーサとジャッキとの間に反力部材を装着し、該反力部材に反力をとって前記ジャッキを伸張させて受け部を押すことで掘削用治具で穴を更に掘削し、その後、反力部材を取り除いて受け部上にジャッキ部を収縮させた状態で、先に施工したセグメントリングと前記ジャッキ部との間に新たなセグメントを取付けて新たなセグメントリングを形成するようにしたことを特徴とする。
本発明によれば、掘削用治具の受け部を押して切刃で掘削を行うためのジャッキ部が、スペーサ内からのジャッキの伸縮とスペーサとの間の反力部材に反力をとるジャッキの伸縮とによって二段階に亘って掘削用治具で穴を掘削するために、ジャッキを収納した収縮状態のジャッキ部の長さがセグメントリングの中心軸方向の幅よりも短くてすみ、ジャッキ部を小型軽量化できるために低コストである上に伸縮や重機等による移動操作が容易でありランニングコストも低い。
According to the hole construction method of the present invention, a drilling jig having a cutting edge at the tip and a receiving part on its inner surface is excavated by pushing the receiving part with a jack part, and the hole is excavated in the hole. A method for excavating a hole in which a plurality of segments are joined to each other in a multistage manner, wherein a spacer is installed in the previously installed segment ring so that the jack of the jack portion can be moved forwards and backwards. The hole is drilled with the excavating jig by pushing the receiving part and a reaction member is mounted between the spacer of the jack part and the jack, and the jack is attached to the reaction member by taking a reaction force. Extend the hole with the excavating jig by pushing the receiving part and then remove the reaction member and shrink the jack part on the receiving part. Install a new segment between the jack unit is characterized in that so as to form a new segment ring.
According to the present invention, the jack portion for performing the excavation with the cutting blade by pushing the receiving portion of the excavation jig, the jack of the jack that takes a reaction force against the reaction force member between the expansion and contraction of the jack from the spacer and the spacer. In order to drill the hole with the drilling jig in two stages by expansion and contraction, the length of the contracted jack part containing the jack is shorter than the width in the central axis direction of the segment ring, and the jack part is Since it can be reduced in size and weight, it is low-cost, and it can be easily moved by expansion and contraction, heavy machinery, etc., and the running cost is low.

また本発明による穴の施工方法は、先端に切刃を有すると共にその内面に受け部を有する掘削用治具に対し、ジャッキ部によって前記受け部を押動することで穴を掘削し、該穴内に複数のセグメントを接合したセグメントリングを多段に接合するようにした穴の掘削方法であって、先に施工したセグメントリングの内面に前記ジャッキ部を取付け、該ジャッキ部を伸張させて受け部を押すことで掘削用治具で穴を掘削し、その後、先に施工したセグメントリングの端面に収縮したジャッキ部を設置し、先に施工した前記セグメントリングの端面に反力をとって前記ジャッキ部を伸張させて受け部を押すことで掘削用治具で穴を更に掘削し、ジャッキ部を収縮させて掘削用治具の内側に移動させ、先に施工した前記セグメントリングと受け部との間に新たなセグメントを取付けて新たなセグメントリングを形成するようにしたことを特徴とする。
本発明においても、掘削用治具の受け部を押して切刃で掘削を行うためのジャッキ部が、セグメントリングの内面に取付けた位置とセグメントリングの端面に設置した位置とでそれぞれ伸張して二段階に亘って掘削用治具で穴を掘削するために、収縮状態のジャッキ部の長さがセグメントリングの中心軸方向の幅よりも短くてすみ、ジャッキ部を小型軽量化できるために低コストである上に伸縮操作等が容易である。
Further, the hole construction method according to the present invention excavates a hole by pushing the receiving portion with a jack portion with respect to an excavation jig having a cutting edge at the tip and having a receiving portion on the inner surface thereof. A method of excavating a hole in which a plurality of segments are joined to each other in multiple stages, wherein the jack portion is attached to the inner surface of the previously installed segment ring, and the jack portion is extended to receive the receiving portion. A hole is excavated with a jig for excavation by pressing, and then a contracted jack part is installed on the end face of the previously installed segment ring, and a reaction force is applied to the end face of the previously installed segment ring to obtain the jack part. The hole is further drilled with the excavating jig by pushing the receiving part and the jack part is contracted and moved to the inside of the excavating jig. Characterized by being adapted to form a new segment ring attached a new segment between.
Also in the present invention, the jack portion for performing the excavation with the cutting blade by pushing the receiving portion of the excavation jig is extended at the position attached to the inner surface of the segment ring and the position installed on the end surface of the segment ring. In order to drill holes with the jig for excavation throughout the stage, the length of the contracted jack part can be shorter than the width of the segment ring in the central axis direction, and the jack part can be reduced in size and weight, so the cost is low. In addition, expansion and contraction operations are easy.

本発明による集水井の施工方法は、先端に切刃を有すると共にその内面に受け部を有する掘削用治具に対し、ジャッキ部によって受け部を押動することで穴を掘削し、該穴内に複数のセグメントを接合したセグメントリングを多段に接合してなる集水井を構築するようにした集水井の施工方法であって、先に施工したセグメントリングにジャッキ部のジャッキを進退可能に収納したスペーサを取付け、該スペーサからジャッキを突出させて受け部を押すことで掘削用治具で穴を掘削し、ジャッキ部のスペーサとジャッキとの間に反力部材を装着し、該反力部材に反力をとってジャッキを伸張させて受け部を押すことで掘削用治具で穴を更に掘削し、その後、反力部材を取り除いて受け部上にジャッキ部を収縮させた状態で、先に施工したセグメントリングとジャッキ部との間に新たなセグメントを取付けて新たなセグメントリングを形成するようにしたことを特徴とする。   The construction method of a drainage well according to the present invention excavates a hole by pushing the receiving portion with a jack portion with respect to an excavating jig having a cutting edge at the tip and a receiving portion on the inner surface thereof. A construction method of a drainage well that is constructed by joining multiple segmented segment rings in multiple stages, and a jack that can be moved forward and backward in the previously constructed segment ring. Then, the jack protrudes from the spacer and pushes the receiving part to dig a hole with the excavating jig, and a reaction member is mounted between the spacer of the jack part and the jack, and the reaction member is counteracted. By extending the jack with force and pushing the receiving part, further drill the hole with the excavating jig, then remove the reaction member and contract the jack part on the receiving part first Seg Install a new segment between the Ntoringu and jack unit is characterized in that so as to form a new segment ring.

また本発明による集水井の施工方法は、先端に切刃を有すると共にその内面に受け部を有する掘削用治具に対し、ジャッキ部によって受け部を押動することで穴を掘削し、該穴内に複数のセグメントを接合したセグメントリングを多段に接合してなる集水井を構築するようにした集水井の施工方法であって、先に施工した前記セグメントリングの内面にジャッキ部を取付け、該ジャッキ部を伸張させて受け部を押すことで掘削用治具で穴を掘削し、その後、先に施工したセグメントリングの端面に収縮したジャッキ部を設置し、先に施工したセグメントリングの端面に反力をとってジャッキ部を伸張させて受け部を押すことで掘削用治具で穴を更に掘削し、ジャッキ部を収縮させて掘削用治具の内側に移動させ、先に施工したセグメントリングと受け部との間に新たなセグメントを取付けて新たなセグメントリングを形成するようにしたことを特徴とする。   Further, the construction method of the drainage well according to the present invention excavates a hole by pushing the receiving portion by a jack portion with respect to an excavating jig having a cutting edge at the tip and a receiving portion on the inner surface thereof, A drainage well construction method for constructing a drainage well in which a plurality of segments are joined to each other in a plurality of stages. A jack portion is attached to the inner surface of the segment ring previously constructed, and the jack Drill the hole with the excavating jig by extending the part and pushing the receiving part, and then install the contracted jack part on the end face of the segment ring that was previously constructed, against the end face of the segment ring that was previously constructed By using force to extend the jack part and push the receiving part, the hole is further excavated with the excavating jig, the jack part is contracted and moved to the inside of the excavating jig, and the segment link previously constructed Install a new segment between the receiving portion, characterized in that so as to form a new segment ring.

また、ジャッキ部は、スペーサ内に収縮させたジャッキを収納した状態でその伸縮方向長さがセグメントリングの中心軸方向の幅よりも短い。また、ジャッキは、収縮させた状態でその伸縮方向長さがセグメントリングの中心軸方向の幅よりも短くした。
また、ジャッキ部は外筒とシリンダとからなるジャッキを備えており、外筒に対してシリンダを相対的に伸張させることで掘削用治具の受け部を押すようにしてもよい。
Moreover, the expansion / contraction direction length is shorter than the width | variety of the center axis direction of a segment ring in the state which accommodated the contracted jack in the spacer. In addition, the length of the expansion / contraction direction of the jack in a contracted state is shorter than the width of the segment ring in the central axis direction.
Moreover, the jack part may be provided with the jack which consists of an outer cylinder and a cylinder, and you may make it push the receiving part of the jig | tool for excavation by extending a cylinder relatively with respect to an outer cylinder.

本発明に係る穴の掘削方法及び集水井の施工方法によれば、ジャッキ部によって二段階に亘って受け部を押して掘削用治具で掘削するために、ジャッキ部がセグメントリングの中心軸方向の幅より短くてすみため、ジャッキ部を小型軽量化できて低コストである上に伸縮操作や掘削用治具の掘削作業が容易になる。   According to the hole excavation method and the drainage well construction method according to the present invention, the jack portion pushes the receiving portion in two stages by the jack portion and excavates with the excavation jig. Since it is shorter than the width, the jack portion can be reduced in size and weight, and it is low-cost. In addition, the extension operation and the excavation work of the excavation jig are facilitated.

以下、本発明の実施の形態を添付図面により説明する。図1乃至図5は第一の実施の形態による鋼製刃口及びこれを用いた穴及び集水井の施工方法を示すものであり、図1は集水井の要部縦断面図、図2は鋼製刃口の縦断面図、図3(a)〜(d)は鋼製刃口に装着したジャッキを示す部分拡大図、図4及び図5は集水井の構築工程を示す図である。
図1において、集水井10は地表面から地中に略円筒状に掘削した穴13内に構築されており、例えば略円弧版形状の複数のRCセグメント(以下、単にセグメントという)11が周方向にその継手(図示せず)によって接続されたリング状のセグメントリング12をその中心軸O方向(深さ方向)に継手で接続することによって形成されている。なお、セグメント11の各継手は例えばボルトまたはナットを備え、これらボルトとナットによって互いに連結されている。
集水井10の上部周囲には地表面から逆円錐台形状の発進穴13aが掘削されており、その地表面付近には集水井10を固定保持するための固定コンクリート14が打設されている。発進穴13aの底面13bには集水井10のセグメントリング12の周囲にズレ止めコンクリート15が打設され、ズレ止めコンクリート15と集水井10のセグメントリング12との間には縁切材16がリング状に設けられている。発進穴13aの固定コンクリート14とズレ止めコンクリート15との間は埋め戻し土17で突き固められている。
Embodiments of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 to 5 show a steel blade according to the first embodiment, a hole using the steel blade, and a method for constructing a drainage well. FIG. 1 is a longitudinal sectional view of an essential part of the drainage well, and FIG. FIGS. 3A to 3D are partially enlarged views showing jacks mounted on the steel blade, and FIGS. 4 and 5 are views showing the construction steps of the drainage well.
In FIG. 1, a drainage well 10 is constructed in a hole 13 excavated in a substantially cylindrical shape from the ground surface into the ground. For example, a plurality of RC segments (hereinafter simply referred to as segments) 11 having a substantially arc shape are circumferentially arranged. The ring-shaped segment ring 12 connected by the joint (not shown) is connected by the joint in the central axis O direction (depth direction). Each joint of the segment 11 includes, for example, a bolt or a nut and is connected to each other by the bolt and the nut.
An inverted frustoconical starting hole 13a is excavated from the ground surface around the upper portion of the water collection well 10, and fixed concrete 14 for fixing and holding the water collection well 10 is placed near the ground surface. On the bottom surface 13b of the start hole 13a, a slip-preventing concrete 15 is placed around the segment ring 12 of the catchment well 10. Between the slip-preventing concrete 15 and the segment ring 12 of the catchment well 10, an edge cutting material 16 is a ring. It is provided in the shape. The space between the fixed concrete 14 and the offset concrete 15 in the start hole 13 a is tamped with backfill soil 17.

次に集水井10を構築するための略円柱状の穴13の掘削に用いる掘削用治具としての鋼製刃口20について図2により説明する。図2に示す鋼製刃口20は本体21が略円筒状に形成され、先端には全周に亘って内側に突出する断面略直角三角形状の切刃22が形成されている。本体21はその内径がセグメントリング12の外径より若干大きく、内側にセグメントリング12が挿入された状態で中心軸O方向に摺動可能とされている。本体21の内面における切刃22近傍に略リング板状の受け部23が内側に突出して形成されている。
そして、図1に示すように、鋼製刃口20の受け部23と本体21内に挿入されたセグメントリング12との間にはジャッキ部28が所定間隔に複数本、例えば90度間隔で4本周方向に配設されている。ジャッキ部28は油圧ジャッキ24と油圧ジャッキ24を出没可能に収納するスペーサ29とで構成されている。ジャッキ部28は、セグメントリング12の先端面12aで反力を受けて伸張することでジャッキダウンし、受け部23を押動して鋼製刃口20を切刃22で地中下方に掘削することになる。
Next, a steel blade 20 as an excavation jig used for excavation of the substantially cylindrical hole 13 for constructing the drainage well 10 will be described with reference to FIG. A steel blade 20 shown in FIG. 2 has a main body 21 formed in a substantially cylindrical shape, and a cutting edge 22 having a substantially right-angled triangular cross-section projecting inward over the entire circumference. The main body 21 has an inner diameter slightly larger than the outer diameter of the segment ring 12 and is slidable in the direction of the central axis O with the segment ring 12 inserted inside. A substantially ring plate-shaped receiving portion 23 is formed in the inner surface of the main body 21 in the vicinity of the cutting edge 22 so as to protrude inward.
As shown in FIG. 1, a plurality of jack portions 28 are provided at predetermined intervals, for example, at intervals of 90 degrees, between the receiving portion 23 of the steel blade edge 20 and the segment ring 12 inserted into the main body 21. Arranged in the circumferential direction. The jack portion 28 includes a hydraulic jack 24 and a spacer 29 that accommodates the hydraulic jack 24 so as to be able to appear and retract. The jack part 28 is jacked down by receiving and extending the reaction force at the distal end surface 12 a of the segment ring 12, and pushes the receiving part 23 to excavate the steel blade edge 20 below the ground with the cutting edge 22. It will be.

図3(a)〜(d)に示すジャッキ部28の拡大図において、油圧ジャッキ24は外筒25とシリンダ26とで概略構成され、シリンダ26は外筒25内に収容された収縮状態と外筒25から突出した伸張状態とを選択的に取り得るように油圧によって伸縮可能とされている。そのため、外筒25には油圧を供給または排出する油圧ホース27が接続されている。
また、油圧ジャッキ24は略有底円筒状のスペーサ29内に出没可能に収容されている。スペーサ29の底部29aにはセグメント11の継手11aに連結可能な継手部31が取付けられている。セグメント11の継手11aやスペーサ29の継手部31は例えばボルトとナット部等で連結可能な構成とされており、この例ではセグメントリング12の下方を向く端面(先端面)の継手11aとしてナット部を、スペーサ29の継手部31として固定ボルトを底部29aに設けて互いに連結可能とされている。図1及び図4に示すように、収縮状態の油圧ジャッキ24及びスペーサ29はセグメント11の幅の約1/2程度の長さに設定されている。
ジャッキ部28の動作について説明すると、まず図3(a)に示す収縮状態の油圧ジャッキ24及びスペーサ29は、外筒25内に油圧ホース27を通して油圧を供給することでスペーサ29内の油圧ジャッキ24を伸張させる。これによってシリンダ26がスペーサ29の底部29aで反力を受けて外筒25をスペーサ29から突出させ、図3(b)に示す状態になる。この状態で外筒25の油圧を排出することでシリンダ26を外筒25内に収縮させる。
すると、スペーサ29とシリンダ26との間に若干の隙間形成されるため、ここに反力板33を挟持させる(図3(c)参照)。次に油圧ホース27から油圧ジャッキ24の外筒25に油圧を供給することでシリンダ26から外筒25が伸張しジャッキダウンする(図3(d)参照)。この状態で、油圧ジャッキ24及びスペーサ29は最大寸法に伸張しており、セグメント11の幅の約1.5倍程度の長さになる。
In the enlarged view of the jack portion 28 shown in FIGS. 3 (a) to 3 (d), the hydraulic jack 24 is schematically configured by an outer cylinder 25 and a cylinder 26, and the cylinder 26 is in a contracted state and is externally accommodated in the outer cylinder 25. It can be expanded and contracted by hydraulic pressure so that the extended state protruding from the tube 25 can be selectively taken. Therefore, a hydraulic hose 27 that supplies or discharges hydraulic pressure is connected to the outer cylinder 25.
The hydraulic jack 24 is accommodated in a substantially bottomed cylindrical spacer 29 so as to be able to appear and retract. A joint 31 that can be connected to the joint 11 a of the segment 11 is attached to the bottom 29 a of the spacer 29. The joint 11a of the segment 11 and the joint part 31 of the spacer 29 are configured to be connectable by, for example, a bolt and a nut part. In this example, a nut part is used as the joint 11a on the end face (tip face) facing downward of the segment ring 12. Are connected to each other by providing a fixing bolt on the bottom part 29a as a joint part 31 of the spacer 29. As shown in FIGS. 1 and 4, the contracted hydraulic jack 24 and the spacer 29 are set to a length of about ½ of the width of the segment 11.
The operation of the jack portion 28 will be described. First, the contracted hydraulic jack 24 and the spacer 29 shown in FIG. 3A are supplied with hydraulic pressure through the hydraulic hose 27 into the outer cylinder 25 to thereby provide the hydraulic jack 24 in the spacer 29. Stretch. As a result, the cylinder 26 receives a reaction force at the bottom 29a of the spacer 29 and causes the outer cylinder 25 to protrude from the spacer 29, resulting in the state shown in FIG. In this state, the cylinder 26 is contracted into the outer cylinder 25 by discharging the hydraulic pressure of the outer cylinder 25.
Then, since a slight gap is formed between the spacer 29 and the cylinder 26, the reaction force plate 33 is sandwiched here (see FIG. 3C). Next, by supplying hydraulic pressure from the hydraulic hose 27 to the outer cylinder 25 of the hydraulic jack 24, the outer cylinder 25 extends from the cylinder 26 and jacks down (see FIG. 3D). In this state, the hydraulic jack 24 and the spacer 29 are extended to the maximum dimension, and are about 1.5 times as long as the width of the segment 11.

次に集水井10の構築方法及び穴の掘削方法について図4及び図5に沿って説明する。なお、図4(c)以降では発進穴13aは図示を省略する。
図4(a)において、集水井10を施工するため、まず地表面から略逆円錐台形状の発進穴13aを掘削し、その底面13bにコンクリートをリング状に打設して基準面33を形成する。この基準面33上に垂直に鋼製刃口20の切刃22を載置し、鋼製刃口20の受け部23上に略等間隔に複数(実施形態では4本)のジャッキ部28を収縮状態で取付ける。この場合、各ジャッキ部28はスペーサ29を上方に位置させ外筒25の底部25aを受け部23に当接させる。なお、外筒25の底部25aを受け部23にボルト等で固定してもよい。
各ジャッキ部28上には、複数のセグメント11を周方向に接続してリング状に形成したセグメントリング12を載置し、更にその上に複数段のセグメントリング12を積層してそれぞれ継手で相互に接続して筒状に形成する。ここで、先端(下端)のセグメントリング12を符号12Aで表示するとして、セグメントリング12Aの先端面に設けられている継手11aにジャッキ部28のスペーサ29の底部29aに設けた継手部31を連結する(図3参照)。
そして、発進穴13aの底面13bにおいてセグメントリング12Aの周囲に縁切り材16を設置し、その外側にズレ止めコンクリート15を打設する。次にズレ止めコンクリート15の上に土を埋設して突き固める。その後、上端近傍のセグメントリング12の内壁面から例えば鉄筋を水平方向に突出させて固定コンクリート14を打設する。このようにして集水井10の発進口の施工が完了する。
Next, the construction method of the drainage well 10 and the excavation method of a hole are demonstrated along FIG.4 and FIG.5. In addition, illustration of the starting hole 13a is abbreviate | omitted after FIG.4 (c).
In FIG. 4 (a), in order to construct the drainage well 10, first, a substantially inverted truncated cone-shaped starting hole 13a is excavated from the ground surface, and concrete is cast in a ring shape on the bottom surface 13b to form a reference surface 33. To do. The cutting blade 22 of the steel blade edge 20 is placed vertically on the reference surface 33, and a plurality of (four in the embodiment) jack portions 28 are provided on the receiving portion 23 of the steel blade edge 20 at substantially equal intervals. Install in a contracted state. In this case, each jack part 28 positions the spacer 29 upward, and makes the bottom part 25a of the outer cylinder 25 contact the receiving part 23. The bottom portion 25a of the outer cylinder 25 may be fixed to the receiving portion 23 with a bolt or the like.
On each jack portion 28, a segment ring 12 formed in a ring shape by connecting a plurality of segments 11 in the circumferential direction is placed, and further, a plurality of segment rings 12 are stacked on each other and joints are connected to each other by joints. Connected to and formed into a cylindrical shape. Here, assuming that the segment ring 12 at the tip (lower end) is denoted by reference numeral 12A, the joint portion 31 provided at the bottom 29a of the spacer 29 of the jack portion 28 is connected to the joint 11a provided at the tip surface of the segment ring 12A. (See FIG. 3).
And the edge cutting material 16 is installed in the circumference | surroundings of the segment ring 12A in the bottom face 13b of the starting hole 13a, and the slip prevention concrete 15 is driven in the outer side. Next, the soil is buried on the concrete 15 to be displaced and hardened. Thereafter, for example, a reinforcing bar is projected in the horizontal direction from the inner wall surface of the segment ring 12 near the upper end, and the fixed concrete 14 is placed. In this way, the construction of the launch port of the water collection well 10 is completed.

この状態から図4(b)に示すように、油圧ホース27から外筒25に油圧を供給すると、収縮状態の油圧ジャッキ24が伸張し、シリンダ26がスペーサ29の底部29aで反力を受けて外筒25をスペーサ29から突出させる(図3(b)参照)。これによって受け部23が下方に押されて鋼製刃口20の切刃22で地盤を油圧ジャッキ24の伸張長さだけ、即ちセグメント11の幅の約1/2程度の深さ掘削する。これを一次掘削という。次に外筒25から油圧を排出し、シリンダ26を外筒25内に収縮させると油圧ジャッキ24はスペーサ28の外側に位置する。そして外筒25に収納されたシリンダ26とスペーサ29との隙間に反力板33を挿入し、挟持させる(図3(c)参照)。
次に再び油圧ジャッキ24の油圧ホース27から外筒25内に油圧を供給すると、シリンダ26が外筒25から突出するが、シリンダ26は反力板33で反力を受けるため、外筒25が下方に押されてジャッキダウンし、受け部23を更に押す。これによって鋼製刃口20を降下させ、切刃22で地盤を更にセグメント11の幅の薬1/2程度の深さ掘削する(図3(C)参照)。これを二次掘削という。
なお、切刃22で穴13の周囲を掘削した後、内側を別の掘削機等で掘削する。
In this state, as shown in FIG. 4B, when hydraulic pressure is supplied from the hydraulic hose 27 to the outer cylinder 25, the contracted hydraulic jack 24 expands, and the cylinder 26 receives a reaction force at the bottom 29a of the spacer 29. The outer cylinder 25 is protruded from the spacer 29 (see FIG. 3B). As a result, the receiving portion 23 is pushed downward, and the ground is excavated with the cutting edge 22 of the steel blade 20 by the extension length of the hydraulic jack 24, that is, about 1/2 of the width of the segment 11. This is called primary excavation. Next, when the hydraulic pressure is discharged from the outer cylinder 25 and the cylinder 26 is contracted into the outer cylinder 25, the hydraulic jack 24 is positioned outside the spacer 28. Then, the reaction force plate 33 is inserted into the gap between the cylinder 26 housed in the outer cylinder 25 and the spacer 29 (see FIG. 3C).
Next, when hydraulic pressure is supplied again from the hydraulic hose 27 of the hydraulic jack 24 into the outer cylinder 25, the cylinder 26 protrudes from the outer cylinder 25, but the cylinder 26 receives a reaction force by the reaction force plate 33, so It is pushed down to jack down, and the receiving part 23 is further pushed. As a result, the steel blade 20 is lowered, and the ground is further excavated by the cutting blade 22 to a depth of about 1/2 of the width of the segment 11 (see FIG. 3C). This is called secondary excavation.
In addition, after excavating the periphery of the hole 13 with the cutting blade 22, the inside is excavated with another excavator or the like.

その後、図5(a)に示すように、ジャッキ部28のスペーサ29の継手部31をセグメントリング12Aの継手11aから外し、油圧ホース27を通して油圧を外筒25から排出することでシリンダ26を移動させて外筒25内に収納する。これによってスペーサ29がシリンダ26と共に降下移動し、油圧ジャッキ24を内部に収納するように収縮する。これにより、先端側のセグメントリング12Aと収縮状態で受け部23上に位置するジャッキ部28との間にセグメントリング12を取付けるためのリング状の空間Sが形成される。
そして、図示しない重機を用いて集水井10の上端開口からワイヤを介して新たなセグメント11を集水井10の底部に降下させ、作業員が空間S内に新たなセグメント11を取付けてその継手と既設のセグメントリング12Aの先端面に設けた継手11aと接合する。次いで、順次ワイヤで降下させられるセグメント11を既設のセグメントリング12A及び先に接合したセグメント11と接合して新たなセグメントリング12B(12)を組み付ける。
そしてセグメントリング12Bの各セグメント11の継手11aにジャッキ部28のスペーサ29の継手部31を連結し、上述した工程を繰り返す。これによって、所要の深さまで穴13を掘削し、セグメントリング12を順次連結して集水井10を構築する。
Thereafter, as shown in FIG. 5A, the joint portion 31 of the spacer 29 of the jack portion 28 is removed from the joint 11a of the segment ring 12A, and the cylinder 26 is moved by discharging the hydraulic pressure from the outer cylinder 25 through the hydraulic hose 27. And stored in the outer cylinder 25. As a result, the spacer 29 moves downward together with the cylinder 26 and contracts so that the hydraulic jack 24 is housed inside. Thereby, a ring-shaped space S for attaching the segment ring 12 is formed between the segment ring 12A on the distal end side and the jack portion 28 positioned on the receiving portion 23 in the contracted state.
Then, using a heavy machine (not shown), the new segment 11 is lowered to the bottom of the catchment well 10 through a wire from the upper end opening of the catchment well 10, and the worker installs the new segment 11 in the space S and It joins with the joint 11a provided in the front end surface of the existing segment ring 12A. Next, the segment 11 that is sequentially lowered by the wire is joined to the existing segment ring 12A and the previously joined segment 11, and a new segment ring 12B (12) is assembled.
And the joint part 31 of the spacer 29 of the jack part 28 is connected with the joint 11a of each segment 11 of the segment ring 12B, and the process mentioned above is repeated. Thereby, the hole 13 is excavated to a required depth, and the collection ring 10 is constructed by sequentially connecting the segment rings 12.

そして、所要の深さまで構築した集水井10の先端で、鋼製刃口20を型枠としてその内側にコンクリートを打設して底部35をつくる(図1参照)。これによって、集水井10内に集めた地下水が底部から地盤に浸透するのを防ぐことができる。
次に、図1において、集水井10の側壁に一点鎖線で示す集水用誘導孔36を放射状に複数ボーリングする。集水用誘導孔36は好ましくは傾斜地の滑り面を横切るように穿孔する。集水井10において、集水用誘導孔36の下方には排水用孔37をボーリングして穿孔する。これにより、雨水や増水した地下水等は集水用誘導孔36を通して集水井10内に集められ、排水用孔37を介して傾斜地の滑り面等から外れたダムや水路、河川等に水を誘導して排出することができる。
Then, at the tip of the water collecting well 10 constructed to a required depth, the steel blade edge 20 is used as a mold to cast concrete on the inside to create the bottom 35 (see FIG. 1). Thereby, it is possible to prevent the groundwater collected in the water collection well 10 from penetrating into the ground from the bottom.
Next, in FIG. 1, a plurality of water collection guide holes 36 indicated by alternate long and short dash lines are bored radially on the side wall of the water collection well 10. The water collecting guide hole 36 is preferably drilled so as to cross the sliding surface of the slope. In the water collection well 10, a drainage hole 37 is drilled and drilled below the water collection guide hole 36. As a result, rainwater, increased groundwater, etc. are collected in the collection well 10 through the water collection guide hole 36, and the water is guided to the dams, waterways, rivers, etc. that are off the sliding surface of the sloping ground through the drainage holes 37. Can be discharged.

上述のように本実施形態による集水井10の構築方法によれば、ジャッキ部28の収縮状態の長さをセグメント11の幅の約半分程度にできるため、上述した従来のジャッキより長さを短くして小型軽量化できて製造コストを低減できると共にジャッキ部28の移動操作も容易である。また、ジャッキ部28は鋼製刃口20と共に埋め殺しするために施工コストを低減できる。   As described above, according to the construction method of the drainage well 10 according to the present embodiment, the length of the contracted state of the jack portion 28 can be reduced to about half of the width of the segment 11, so that the length is shorter than the conventional jack described above. Thus, the size and weight can be reduced, the manufacturing cost can be reduced, and the moving operation of the jack portion 28 is easy. Moreover, since the jack part 28 is buried with the steel blade edge 20, it can reduce construction cost.

次に本発明の第二実施形態を図6乃至11により説明するが、上述の実施形態と同一または同様の部分、部材には同一の符号を用いて説明を省略する。
図6に示すように、本実施形態による鋼製刃口20を押し込むジャッキ部40は第一実施形態における外筒25とシリンダ26とを備えた油圧ジャッキ24を備えている。更にシリンダ26の先端にはセグメント11に連結する連結部41が着脱可能に設けられている。連結部41は図7及び図8に示すように縦板41a及び横板41bが縦断面視で略直角三角形状に形成され、その両側部に側板41c、41cが連結されている。縦板41aにはボルト42が孔部を貫通してセグメント11の長手方向及び短手方向(幅方向)のほぼ中心部分に穿孔形成した雌ねじ部43に螺合している。横板41bにはボルト44が孔部を貫通して油圧ジャッキ24のシリンダ26に穿孔形成した図示しない雌ねじ部に螺合している。
図8に示す略円弧版状に湾曲形成されたセグメント11の平面図において、その重心位置をLとすると、シリンダ26はセグメント11における重心位置L付近で連結部41が連結されている。また図6に示すように、シリンダ26を外筒25内に収納した状態の油圧ジャッキ24はセグメント11の幅の略1/2程度の長さに設定されている。
Next, a second embodiment of the present invention will be described with reference to FIGS. 6 to 11. However, the same or similar parts and members as those of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.
As shown in FIG. 6, the jack part 40 which pushes in the steel blade opening 20 by this embodiment is provided with the hydraulic jack 24 provided with the outer cylinder 25 and the cylinder 26 in 1st embodiment. Further, a connecting portion 41 connected to the segment 11 is detachably provided at the tip of the cylinder 26. As shown in FIGS. 7 and 8, the connecting portion 41 includes a vertical plate 41a and a horizontal plate 41b formed in a substantially right triangle shape in a longitudinal sectional view, and side plates 41c and 41c are connected to both sides thereof. A bolt 42 penetrates through the hole in the vertical plate 41a and is screwed into a female screw portion 43 formed in a substantially central portion in the longitudinal direction and short direction (width direction) of the segment 11. A bolt 44 penetrates through the hole in the horizontal plate 41b and is screwed into a female screw (not shown) formed in the cylinder 26 of the hydraulic jack 24.
In the plan view of the segment 11 that is curved in a substantially circular arc shape shown in FIG. 8, assuming that the center of gravity is L, the connecting portion 41 is connected to the cylinder 26 near the center of gravity L in the segment 11. Further, as shown in FIG. 6, the hydraulic jack 24 in a state where the cylinder 26 is housed in the outer cylinder 25 is set to a length that is approximately ½ of the width of the segment 11.

ここで、図9は重機等でワイヤWを介してセグメント11を集水井10の上部開口から降下する場合のワイヤWの取付け位置を示すセグメント11の中央縦断面図であり、図中、セグメント11の長手及び短手(幅)方向の中心線が交差する位置に上述した雌ねじ部43が形成されており、雌ねじ部43に雄ねじ部46aが螺合された係止ピン46の中心孔46bにワイヤWのフック47が係合するようになっている。このフック47の係合位置は上述したセグメント11の重心位置Lに相当する。なお、第一実施形態においてセグメント11をワイヤWで吊り下げる場合においても同様な構成を有している。   Here, FIG. 9 is a central longitudinal sectional view of the segment 11 showing the attachment position of the wire W when the segment 11 is lowered from the upper opening of the drainage well 10 via the wire W by a heavy machine or the like. The female screw portion 43 is formed at a position where the longitudinal and short (width) direction center lines intersect, and a wire is inserted into the central hole 46b of the locking pin 46 in which the male screw portion 46a is screwed into the female screw portion 43. W hooks 47 are engaged. The engagement position of the hook 47 corresponds to the gravity center position L of the segment 11 described above. In the first embodiment, the same structure is used when the segment 11 is suspended by the wire W.

次に上述したジャッキ部40を用いた集水井10の構築方法について図6,図10及び図11に沿って説明する。
先ず、図6に示すように先に構築途中の集水井10の先端面に取付けたセグメントリング12Aに対して所定間隔で複数(例えば4本)の油圧ジャッキ24を装着する。各油圧ジャッキ24の装着に際しては、図7及び図8に示すように、セグメント11の内面における雌ねじ部43からワイヤWを係止する係止ピン46を外して、ボルト42を連結部41の縦板41aに挿通して雌ねじ部43に螺合する。また、横板41bにはボルト44を挿通し、油圧ジャッキ24のシリンダ26に設けた雌ねじ部に螺合する。この状態でシリンダ26を収容した外筒25の先端が鋼製刃口20の受け部23に当接している(図6参照)。
そして、図10(a)に示すように、各油圧ジャッキ24の外筒25に油圧ホース27を介して油圧を供給し、連結部41で固定保持されたシリンダ26に対して外筒25を伸張させジャッキダウンさせる。これによって各外筒25で受け部23を下方に押して鋼製刃口20で地盤を一次掘削して穴13を掘り下げる。シリンダ26に対して外筒25が伸張した時点で、連結部41をセグメント11及びシリンダ26から外す。次いで、外筒25から油圧を排出してシリンダ26を収縮させて外筒25内に収容する。すると油圧ジャッキ24はセグメントリング12Aの下側に位置する。
Next, the construction method of the water collection well 10 using the jack part 40 mentioned above is demonstrated along FIG.6, FIG10 and FIG.11.
First, as shown in FIG. 6, a plurality (for example, four) of hydraulic jacks 24 are mounted at a predetermined interval on the segment ring 12 </ b> A attached to the front end surface of the collecting well 10 that is being constructed first. When mounting each hydraulic jack 24, as shown in FIGS. 7 and 8, the locking pin 46 that locks the wire W is removed from the female screw portion 43 on the inner surface of the segment 11, and the bolt 42 is connected to the vertical portion of the connecting portion 41. It is inserted into the plate 41 a and screwed into the female screw portion 43. Further, a bolt 44 is inserted into the horizontal plate 41b and screwed into a female screw portion provided in the cylinder 26 of the hydraulic jack 24. In this state, the tip of the outer cylinder 25 that houses the cylinder 26 is in contact with the receiving portion 23 of the steel blade 20 (see FIG. 6).
Then, as shown in FIG. 10A, hydraulic pressure is supplied to the outer cylinder 25 of each hydraulic jack 24 via the hydraulic hose 27, and the outer cylinder 25 is extended with respect to the cylinder 26 fixedly held by the connecting portion 41. Let it jack down. As a result, the receiving portion 23 is pushed downward by each outer cylinder 25, and the ground is primarily excavated by the steel blade 20 to dig the hole 13. When the outer cylinder 25 extends with respect to the cylinder 26, the connecting portion 41 is removed from the segment 11 and the cylinder 26. Next, the hydraulic pressure is discharged from the outer cylinder 25, the cylinder 26 is contracted and accommodated in the outer cylinder 25. Then, the hydraulic jack 24 is positioned below the segment ring 12A.

次に図10(b)に示すように、油圧ジャッキ24を例えばワイヤWに連結してセグメントリング12Aと受け部23との間の空間に移動させる。
そして、再度、油圧ジャッキ24の外筒25に油圧ホース27から油圧を供給し、図11(a)に示すように、シリンダ26が当接するセグメントリング12Aの先端面から反力を受けて外筒25を下方に押して受け部23を介して鋼製刃口20を下方に移動させて地盤を二次掘削する。油圧ジャッキ24が伸張することによって、既設のセグメントリング12Aの先端面と受け部23との間の間隔はセグメント11の幅より若干大きな長さになる。
Next, as shown in FIG. 10B, the hydraulic jack 24 is connected to the wire W, for example, and moved to the space between the segment ring 12 </ b> A and the receiving portion 23.
Then, hydraulic pressure is supplied again from the hydraulic hose 27 to the outer cylinder 25 of the hydraulic jack 24, and as shown in FIG. 11 (a), the outer cylinder receives a reaction force from the distal end surface of the segment ring 12A with which the cylinder 26 abuts. 25 is pushed downward, the steel blade 20 is moved downward through the receiving portion 23, and the ground is secondarily excavated. When the hydraulic jack 24 extends, the distance between the tip end surface of the existing segment ring 12 </ b> A and the receiving portion 23 becomes slightly longer than the width of the segment 11.

次に図11(b)に示すように、油圧ホース27から油圧を排出して外筒25内にシリンダ26を収納させて油圧ジャッキ24を収縮させる。そして、各油圧ジャッキ24にワイヤWを接続して油圧ジャッキ24を鋼製刃口20の径方向内側に移動させ、既設のセグメントリング12Aの下方に空間Sを形成する。この状態でワイヤWに連結した新たなセグメント11を集水井10の上端開口から重機等を用いて降下させ、空間S内に押し込んで既設のセグメントリング12Aの先端面と継手同士で連結する。空間S内で周方向に順次新たなセグメント11を押し込んでは継手で周方向及び軸方向に連結することでセグメントリング12Bを組立てる。
その後、各油圧ジャッキ24を新たなセグメントリング12Bの内面に連結部41を介してボルト42,44で連結することで、図6に示すように油圧ジャッキ24はセグメントリング12Bのセグメント11内面の幅方向略中央に吊り下げられ、外筒25の先端が受け部23に当接した状態になる。
上述の工程を繰り返すことで、穴13を略円柱状に掘削すると共に順次セグメントリング12を多段に連結して略円筒状の集水井10を施工でき、その先端で鋼製刃口20を型枠として内側にコンクリートを打設して底部35をつくる。
Next, as shown in FIG. 11B, the hydraulic pressure is discharged from the hydraulic hose 27, the cylinder 26 is accommodated in the outer cylinder 25, and the hydraulic jack 24 is contracted. And the wire W is connected to each hydraulic jack 24, the hydraulic jack 24 is moved to the radial inside of the steel blade edge 20, and the space S is formed under the existing segment ring 12A. In this state, the new segment 11 connected to the wire W is lowered from the upper end opening of the water collection well 10 using a heavy machine or the like, and is pushed into the space S to be connected to the distal end surface of the existing segment ring 12A and the joints. The new segment 11 is sequentially pushed in the circumferential direction in the space S, and the segment ring 12B is assembled by connecting in a circumferential direction and an axial direction with a joint.
Thereafter, each hydraulic jack 24 is connected to the inner surface of the new segment ring 12B with bolts 42 and 44 via the connecting portion 41, so that the hydraulic jack 24 has a width of the inner surface of the segment 11 of the segment ring 12B as shown in FIG. It is suspended in the approximate center of the direction, and the tip of the outer cylinder 25 is in contact with the receiving portion 23.
By repeating the above-described steps, the hole 13 can be excavated into a substantially columnar shape, and the segment ring 12 can be sequentially connected in multiple stages to construct a substantially cylindrical water collection well 10. As shown in FIG.

本実施形態によっても第一実施形態による穴13及び集水井10の施工方法と同様の作用効果を奏する。特に本実施形態ではセグメント11を降下させるための係止ピン46の雌ねじ部43を利用して油圧ジャッキ24を連結させて鋼製刃口20を押すようにしたので、第一実施形態による方法と比較してジャッキ部40にスペーサ29を用いなくてもよく一層コストを低減できて、しかもその長さをセグメント11の幅の約1/2程度に構成できるから1回の作動工程で鋼製刃口20を2回に分けて掘削して1組のセグメントリング12の幅に相当する長さ分、掘削・降下させることができる。   Also according to this embodiment, there are the same effects as the construction method of the hole 13 and the water collection well 10 according to the first embodiment. In particular, in this embodiment, the hydraulic jack 24 is connected by using the female screw portion 43 of the locking pin 46 for lowering the segment 11 and the steel blade 20 is pushed. In comparison, it is not necessary to use the spacer 29 in the jack portion 40, and the cost can be further reduced, and the length can be configured to be about ½ of the width of the segment 11, so that the steel blade can be formed in one operation step. The mouth 20 can be excavated in two portions and excavated and lowered by a length corresponding to the width of the pair of segment rings 12.

なお、上述の各実施形態において、収縮状態の油圧ジャッキ24の長さは必ずしもセグメント11の幅の1/2程度でなくてもよく、少なくともセグメント11の幅よりも短い長さに形成できれば、油圧ジャッキ24を小型、軽量化できて低コストで製造でき、しかも1組のセグメントリング12の幅に相当する長さを掘削・降下できる。
また、上述の各実施形態において、多段のセグメントリング12を形成する各セグメント11をRCセグメントとしたが、これに代えて鋼製セグメントや合成セグメント等でもよく、あるいは他の鋼製等の枠体や板体等で構成されていてもよく、要するに集水井10を筒状に形成する部材であればよい。本発明ではこれらセグメント11等の各種部材を総称してセグメントという。
In each of the above-described embodiments, the length of the contracted hydraulic jack 24 is not necessarily about ½ of the width of the segment 11, and can be hydraulic if it can be formed at least shorter than the width of the segment 11. The jack 24 can be reduced in size and weight, and can be manufactured at a low cost. In addition, a length corresponding to the width of the pair of segment rings 12 can be excavated and lowered.
Further, in each of the above-described embodiments, each segment 11 forming the multistage segment ring 12 is an RC segment. However, instead of this, a steel segment, a synthetic segment, or the like, or another steel frame, etc. In other words, any member that forms the drainage well 10 in a cylindrical shape may be used. In the present invention, various members such as the segment 11 are collectively referred to as a segment.

また、本発明では、ジャッキとして油圧ジャッキ24に代えて機械式ジャッキ等の各種ジャッキを用いてもよい。ジャッキ部28、40として油圧ジャッキ24等のジャッキ、或いはジャッキに加えてこれを進退可能に収納するスペーサ29を備えたものを含むものとする。
また、ジャッキ部28,40を伸張させて鋼製刃口20を押す場合、受け部23を油圧ジャッキ24の外筒25で押すようにしたが、油圧ジャッキ24をこれとは上下逆に配設してシリンダ26で受け部23を押すように構成してもよい。
なお、上述の各実施形態では、集水井10を施工するために穴13を掘削するようにしたが、本発明は集水井10以外の他の用途の筒状部等を構築するための穴の掘削方法としても採用できる。
In the present invention, various jacks such as a mechanical jack may be used as the jack instead of the hydraulic jack 24. The jack portions 28 and 40 include a jack such as the hydraulic jack 24 or a jack provided with a spacer 29 that accommodates the jack so that the jack can be advanced and retracted.
Further, when the jack portions 28 and 40 are extended and the steel blade 20 is pushed, the receiving portion 23 is pushed by the outer cylinder 25 of the hydraulic jack 24. However, the hydraulic jack 24 is disposed upside down. Then, the cylinder 26 may be configured to push the receiving portion 23.
In each of the above-described embodiments, the hole 13 is excavated in order to construct the drainage well 10, but the present invention provides a hole for constructing a tubular portion or the like for other uses other than the drainage well 10. It can also be used as a drilling method.

本発明の第一の実施形態による集水井の側面図である。It is a side view of a catchment well by a first embodiment of the present invention. 図1に示す鋼製刃口の拡大断面図である。It is an expanded sectional view of the steel blade edge shown in FIG. 図1に示す鋼製刃口を掘削させるためのジャッキ部を示すもので、(a)は収縮した状態、(b)はスペーサから油圧ジャッキを突出させた状態、(c)はシリンダに反力板を装着した状態を示す図、(d)は(b)の状態から油圧ジャッキをジャッキダウンさせた状態を示す説明図である。1 shows a jack portion for excavating the steel blade shown in FIG. 1, wherein (a) shows a contracted state, (b) shows a state in which a hydraulic jack protrudes from a spacer, and (c) shows a reaction force against a cylinder. The figure which shows the state which mounted | wore the board, (d) is explanatory drawing which shows the state which jacked down the hydraulic jack from the state of (b). (a)、(b)、(c)は鋼製刃口とジャッキ部によって穴を掘削して集水井を構築する工程を示す図である。(A), (b), (c) is a figure which shows the process of excavating a hole with a steel blade edge and a jack part, and constructing | collecting a water well. (a)、(b)は掘削した穴にセグメントリングを連結して集水井を構築する工程を示す図である。(A), (b) is a figure which shows the process of connecting a segment ring to the excavated hole and constructing a drainage well. 第二実施形態による穴の掘削方法を示すもので、ジャッキ部を装着した鋼製刃口と集水井の断面図である。The hole excavation method by 2nd embodiment is shown, Comprising: It is sectional drawing of the steel blade edge | tip with which the jack part was mounted | worn, and a drainage well. セグメントリングのセグメント内面に油圧ジャッキを装着した状態を示す部分縦断面図である。It is a fragmentary longitudinal cross-section which shows the state which mounted | wore the hydraulic jack to the segment inner surface of the segment ring. セグメントに油圧ジャッキを取付けた状態を示す平面図である。It is a top view which shows the state which attached the hydraulic jack to the segment. セグメントの内面にワイヤを連結した状態を示す部分縦断面図である。It is a fragmentary longitudinal cross-section which shows the state which connected the wire to the inner surface of the segment. (a)、(b)は鋼製刃口とジャッキ部によって穴を掘削して集水井を構築する工程を示す図である。(A), (b) is a figure which shows the process of excavating a hole with a steel blade edge and a jack part, and constructing | collecting a water well. (a)、(b)、(c)は鋼製刃口とジャッキ部によって穴を掘削して集水井を構築する工程を示す図である。(A), (b), (c) is a figure which shows the process of excavating a hole with a steel blade edge and a jack part, and constructing | collecting a water well. 従来の油圧ジャッキを取付けた鋼製刃口を示す縦断面図である。It is a longitudinal cross-sectional view which shows the steel blade edge | tip which attached the conventional hydraulic jack. (a)、(b)、(c)は図12に示す鋼製刃口で筒状穴を掘削して集水井を構築する方法を示す図である。(A), (b), (c) is a figure which shows the method of excavating a cylindrical hole with the steel blade edge | tip shown in FIG. 12, and constructing | collecting a water well.

符号の説明Explanation of symbols

10 集水井
11 セグメント
12、12A、12B セグメントリング
13 穴
20 鋼製刃口(掘削用治具)
22 切刃
23 受け部
24 油圧ジャッキ(ジャッキ)
25 外筒
26 シリンダ
28、40 ジャッキ部
29 スペーサ
33 反力板(反力部材)
41 連結部
10 Catchment wells 11 segments
12, 12A, 12B Segment ring
13 hole 20 steel blade (excavation jig)
22 Cutting edge 23 Receiving part 24 Hydraulic jack (jack)
25 Outer cylinder 26 Cylinder 28, 40 Jack part 29 Spacer 33 Reaction force plate (Reaction force member)
41 connecting part

Claims (7)

先端に切刃を有すると共にその内面に受け部を有する掘削用治具に対し、ジャッキ部によって前記受け部を押動することで穴を掘削し、該穴内に複数のセグメントを接合したセグメントリングを多段に接合するようにした穴の掘削方法であって、
先に施工した前記セグメントリングにジャッキ部のジャッキを進退可能に収納したスペーサを取付け、
該スペーサからジャッキを突出させて前記受け部を押すことで掘削用治具で穴を掘削し、
前記ジャッキ部のスペーサとジャッキとの間に反力部材を装着し、
該反力部材に反力をとって前記ジャッキを伸張させて前記受け部を押すことで掘削用治具で穴を更に掘削し、
その後、前記反力部材を取り除いて受け部上に前記ジャッキ部を収縮させた状態で、先に施工した前記セグメントリングと前記ジャッキ部との間に新たなセグメントを取付けて新たなセグメントリングを形成するようにしたことを特徴とする穴の掘削方法。
With respect to a drilling jig having a cutting edge at the tip and a receiving part on the inner surface, a hole is excavated by pushing the receiving part by a jack part, and a segment ring in which a plurality of segments are joined in the hole is provided. A method of drilling holes that are joined in multiple stages,
Attach a spacer that allows the jack of the jack part to be moved forward and backward to the segment ring previously constructed,
Drill a hole with a jig for excavation by pushing a jack from the spacer and pushing the receiving part,
A reaction force member is mounted between the jack part spacer and the jack,
Further drilling a hole with a drilling jig by pushing the receiving part by extending the jack by taking a reaction force on the reaction member,
Thereafter, the reaction force member is removed and the jack portion is contracted on the receiving portion, and a new segment ring is formed by attaching a new segment between the previously constructed segment ring and the jack portion. A method for excavating a hole, characterized in that:
先端に切刃を有すると共にその内面に受け部を有する掘削用治具に対し、ジャッキ部によって前記受け部を押動することで穴を掘削し、該穴内に複数のセグメントを接合したセグメントリングを多段に接合するようにした穴の掘削方法であって、
先に施工した前記セグメントリングの内面に前記ジャッキ部を取付け、
該ジャッキ部を伸張させて前記受け部を押すことで掘削用治具で穴を掘削し、
その後、先に施工した前記セグメントリングの端面に収縮した前記ジャッキ部を設置し、
前記先に施工した前記セグメントリングの端面に反力をとって前記ジャッキ部を伸張させて前記受け部を押すことで掘削用治具で穴を更に掘削し、
前記ジャッキ部を収縮させて前記掘削用治具の内側に移動させ、
前記先に施工した前記セグメントリングと前記受け部との間に新たなセグメントを取付けて新たなセグメントリングを形成するようにしたことを特徴とする穴の掘削方法。
With respect to a drilling jig having a cutting edge at the tip and a receiving part on the inner surface, a hole is excavated by pushing the receiving part by a jack part, and a segment ring in which a plurality of segments are joined in the hole is provided. A method of drilling holes that are joined in multiple stages,
Attach the jack part to the inner surface of the segment ring that was previously constructed,
Extruding a hole with a jig for excavation by extending the jack and pushing the receiving part,
Then, install the contracted jack portion on the end face of the segment ring that was constructed earlier,
Further excavating a hole with an excavating jig by pushing the receiving part by extending the jack part by taking a reaction force on the end face of the segment ring that was previously constructed,
The jack portion is contracted and moved to the inside of the excavation jig,
A hole excavation method characterized in that a new segment ring is formed by attaching a new segment between the segment ring and the receiving portion that have been previously constructed.
先端に切刃を有すると共にその内面に受け部を有する掘削用治具に対し、ジャッキ部によって前記受け部を押動することで穴を掘削し、該穴内に複数のセグメントを接合したセグメントリングを多段に接合してなる集水井を構築するようにした集水井の施工方法であって、
先に施工した前記セグメントリングにジャッキ部のジャッキを進退可能に収納したスペーサを取付け、
該スペーサからジャッキを突出させて前記受け部を押すことで掘削用治具で穴を掘削し、前記ジャッキ部のスペーサとジャッキとの間に反力部材を装着し、
該反力部材に反力をとって前記ジャッキを伸張させて前記受け部を押すことで掘削用治具で穴を更に掘削し、
その後、前記反力部材を取り除いて受け部上に前記ジャッキ部を収縮させた状態で、先に施工した前記セグメントリングと前記ジャッキ部との間に新たなセグメントを取付けて新たなセグメントリングを形成するようにしたことを特徴とする集水井の施工方法。
With respect to a drilling jig having a cutting edge at the tip and a receiving part on the inner surface, a hole is excavated by pushing the receiving part by a jack part, and a segment ring in which a plurality of segments are joined in the hole is provided. A method for constructing a drainage well that is constructed by joining multiple stages,
Attach a spacer that allows the jack of the jack part to be moved forward and backward to the segment ring previously constructed,
Extruding a hole with a jig for excavation by projecting a jack from the spacer and pushing the receiving part, mounting a reaction force member between the spacer of the jack part and the jack,
Further drilling a hole with a drilling jig by pushing the receiving part by extending the jack by taking a reaction force on the reaction member,
Thereafter, the reaction force member is removed and the jack portion is contracted on the receiving portion, and a new segment ring is formed by attaching a new segment between the previously constructed segment ring and the jack portion. A construction method of a drainage well characterized by that.
先端に切刃を有すると共にその内面に受け部を有する掘削用治具に対し、ジャッキ部によって前記受け部を押動することで穴を掘削し、該穴内に複数のセグメントを接合したセグメントリングを多段に接合してなる集水井を構築するようにした集水井の施工方法であって、
先に施工した前記セグメントリングの内面に前記ジャッキ部を取付け、
該ジャッキ部を伸張させて前記受け部を押すことで掘削用治具で穴を掘削し、
その後、先に施工した前記セグメントリングの端面に収縮した前記ジャッキ部を設置し、
前記先に施工した前記セグメントリングの端面に反力をとって前記ジャッキ部を伸張させて前記受け部を押すことで掘削用治具で穴を更に掘削し、
前記ジャッキ部を収縮させて前記掘削用治具の内側に移動させ、
前記先に施工した前記セグメントリングと前記受け部との間に新たなセグメントを取付けて新たなセグメントリングを形成するようにしたことを特徴とする集水井の施工方法。
With respect to a drilling jig having a cutting edge at the tip and a receiving part on the inner surface, a hole is excavated by pushing the receiving part by a jack part, and a segment ring in which a plurality of segments are joined in the hole is provided. A method for constructing a drainage well that is constructed by joining multiple stages,
Attach the jack part to the inner surface of the segment ring that was previously constructed,
Extruding a hole with a jig for excavation by extending the jack and pushing the receiving part,
Then, install the contracted jack portion on the end face of the segment ring that was constructed earlier,
Further excavating a hole with an excavating jig by pushing the receiving part by extending the jack part by taking a reaction force on the end face of the segment ring that was previously constructed,
The jack portion is contracted and moved to the inside of the excavation jig,
A construction method for a drainage well, wherein a new segment ring is formed by attaching a new segment between the segment ring and the receiving portion that have been previously constructed.
前記ジャッキ部は、スペーサ内に収縮させたジャッキを収納した状態でその伸縮方向長さがセグメントリングの中心軸方向の幅よりも短いことを特徴とする請求項3に記載の集水井の施工方法。   The method for constructing a drainage well according to claim 3, wherein the jack portion has a contracted jack accommodated in a spacer and has a length in an expansion / contraction direction shorter than a width in a central axis direction of the segment ring. . 前記ジャッキ部は、収縮させた状態でその伸縮方向長さがセグメントリングの中心軸方向の幅よりも短くした請求項3乃至5のいずれかに記載の集水井の施工方法。   The construction method of a drainage well according to any one of claims 3 to 5, wherein in the contracted state, the jack portion has a length in an expansion / contraction direction shorter than a width in a central axis direction of a segment ring. 前記ジャッキ部は外筒とシリンダとからなるジャッキを備えており、前記外筒に対してシリンダを相対的に伸張させることで前記掘削用治具の受け部を押すようにした請求項3乃至6のいずれかに記載の集水井の施工方法。

7. The jack portion includes a jack composed of an outer cylinder and a cylinder, and the receiving portion of the excavation jig is pushed by extending the cylinder relative to the outer cylinder. The construction method of the drainage well as described in any one of.

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CN111779487A (en) * 2020-07-17 2020-10-16 中铁十二局集团有限公司 Construction method of end well of automatic footpath

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CN109113746A (en) * 2018-07-24 2019-01-01 北京隧盾市政建设有限公司 The construction method of shield inspection-pit
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CN111779487A (en) * 2020-07-17 2020-10-16 中铁十二局集团有限公司 Construction method of end well of automatic footpath
CN111779487B (en) * 2020-07-17 2022-03-08 中铁十二局集团有限公司 Construction method of end well of automatic footpath

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