JP3968663B2 - Gantry support structure - Google Patents

Gantry support structure Download PDF

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JP3968663B2
JP3968663B2 JP2004271881A JP2004271881A JP3968663B2 JP 3968663 B2 JP3968663 B2 JP 3968663B2 JP 2004271881 A JP2004271881 A JP 2004271881A JP 2004271881 A JP2004271881 A JP 2004271881A JP 3968663 B2 JP3968663 B2 JP 3968663B2
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gantry
work
truss
support structure
hole
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JP2006083664A (en
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博考 木村
公明 阪本
光男 東野
秋夫 千葉
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Obayashi Corp
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  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
  • Bridges Or Land Bridges (AREA)
  • Piles And Underground Anchors (AREA)

Description

本発明は、主として道路や営業路線列車が走行する線路が敷設された車両走行領域で杭施工を行う際に用いられる構台支持構造に関する。   The present invention relates to a gantry support structure used when pile construction is mainly performed in a vehicle travel region in which a road on which a road or a business line train travels is laid.

従来、主要な駅周辺においては、さまざまなビルの間にペデストリアンデッキを設けることでビル同士を互いに結び、人々の利便性が図られてきたが、最近では、大規模再開発に伴って、もはやペデストリアンデッキと呼ぶにふさわしくないほどの規模を持ついわゆる人工地盤がビルの低層階高さに建設され、かかる人工地盤を介して超高層オフィスビルや高層マンションといった主要な施設が相互に結ばれるようになってきた。   Conventionally, around the main stations, pedestrian decks have been established between various buildings to connect the buildings to each other for the convenience of people, but recently, with the large-scale redevelopment, A so-called artificial ground with a scale that is not suitable to be called a pedestrian deck is built at the height of the lower floor of the building, and major facilities such as high-rise office buildings and high-rise apartments are connected to each other through such artificial ground It has become.

そして、人工地盤の規模はますます大きくなり、線路が敷設された上空にも人工地盤を延設して線路反対側のビル群と一体化を図ることも行われている。   And the scale of the artificial ground is increasing, and the artificial ground is extended to the sky where the track is laid to be integrated with the building group on the opposite side of the track.

このような人工地盤は、営業路線の運行を何ら妨げることなく、駅周辺のビル群を自由に行き来することができるため、主要駅の再開発が行われる際には、今後ますます採用例が増えてくるであろうと予想されている。   Such artificial ground can move freely around the station without interfering with the operation of the business route, so when redevelopment of major stations is carried out, more and more examples will be adopted in the future. It is expected to increase.

特開2004−52293号公報JP 2004-52293 A

ここで、営業路線の上空に人工地盤を構築するにあたっては、該人工地盤の荷重を安全確実に地盤に伝達すべく、線路敷設領域にあらたな杭を構築し、かかる杭に柱を立設して人工地盤を支えることとなる。   Here, when constructing artificial ground above the business route, in order to transmit the load of the artificial ground to the ground safely and reliably, a new pile is constructed in the track laying area, and a pillar is erected on the pile. Will support the artificial ground.

ここで、営業路線の線路敷設領域に杭を構築する条件として、公共交通機関である営業路線の運行に影響が出ないようにしつつ、コスト面においても可能な限り短工期で工事を終えることが望ましい。もちろん乗降客や列車の安全確保が重要であることは言うまでもない。   Here, as a condition for constructing piles in the track laying area of the business route, it is possible to finish the work in the shortest possible construction period in terms of cost while preventing the operation of the business route that is public transportation from being affected. desirable. Needless to say, it is important to secure passengers and trains.

しかしながら、従来の構築方法では、線路上方の作業架台に載置された回転動力装置でケーシングチューブを回転させつつ地盤内に貫入させていくため、ケーシングチューブは、杭径以上の径が必要となるのみならず、回転するケーシングチューブを露出させておくわけにはもちろんいかないため、これを内挿できるだけの保護用外管が必要となる。   However, in the conventional construction method, the casing tube is penetrated into the ground while rotating the casing tube with the rotary power device mounted on the work platform above the railway line, so the casing tube needs to have a diameter larger than the pile diameter. Of course, it is not possible to expose the rotating casing tube, so a protective outer tube that can be inserted is required.

加えて、ケーシングチューブを貫入している間、油圧グラブを該ケーシングチューブ内に吊り下ろして掘削土砂を搬出するとともに、ある程度、ケーシングチューブが貫入されたならば、今度は、ケーシングチューブ内にドリリングバケットを吊り降ろし、杭孔の削孔を進めることになる。   In addition, while penetrating the casing tube, the hydraulic grab is suspended in the casing tube to carry out the excavated earth and sand. Will be suspended and the drilling of the pile hole will proceed.

そのため、保護用外管は、その外径が概ね3mにも及ぶこととなり、作業架台に載置される回転動力装置を支持すべく、複数本の支柱を保護用外管の近傍に立設せねばならないこととも相まって、乗降客の利便性確保や列車の安全運行に支障を来す懸念があるという問題を生じていた。   For this reason, the outer diameter of the protective outer tube reaches approximately 3 m, and a plurality of columns are erected in the vicinity of the outer protective tube in order to support the rotary power device placed on the work platform. Coupled with the necessity, there has been a problem that there is a concern that the convenience of getting on and off passengers and the safe operation of trains may be hindered.

また、ケーシングチューブに杭径と同等以上の径が必要なため、たとえ軌道間で削孔スペースを確保することができたとしても、営業路線の運行中は工事を中断せねばならず、結果として工事が非効率的となって大幅に長期化するという問題も生じていた。   In addition, because the casing tube needs to have a diameter equal to or greater than the pile diameter, even if a drilling space can be secured between the tracks, the construction must be interrupted during operation of the business route. There has also been a problem that the construction is inefficient and takes a long time.

道路についても状況はほぼ同様であり、例えば高速道路を通行止めにしなければ工事ができず、結果として工事が大幅に遅れることになる。   For roads, the situation is almost the same. For example, construction is not possible unless the highway is closed, resulting in a significant delay in construction.

本発明は、上述した事情を考慮してなされたもので、乗降客や列車の安全を確保しつつ、短工期で工事を終えることが可能な構台支持構造を提供することを目的とする。   The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide a gantry support structure that can finish construction in a short construction period while ensuring the safety of passengers and trains.

上記目的を達成するため、本発明に係る構台支持構造は請求項1に記載したように、作業構台の上面に上部支持機構を立設し該上部支持機構を介して前記作業構台とほぼ同一高さで該作業構台に水平に隣接された可搬性構台を支持するように構成し、前記上部支持機構をトラスで構成するとともに、該トラスを逆V字状に配置される2本の引張トラス材と該2本の引張トラス材が取り合う箇所に頭部が連結された圧縮トラス材とで構成し、前記2本の引張トラス材の内、一方を前記作業構台の上面に、他方を前記可搬性構台に連結するとともに、前記圧縮トラス材の下端を前記作業構台の上面に連結して鉛直に立設したものである。   In order to achieve the above object, the gantry support structure according to the present invention has an upper support mechanism erected on the upper surface of the work gantry as described in claim 1, and has the same height as the work gantry via the upper support mechanism. Now, it is configured to support a portable gantry horizontally adjacent to the work gantry, the upper support mechanism is composed of a truss, and the two truss truss members are arranged in an inverted V shape. And a compressed truss material having a head connected to a place where the two tensile truss materials meet, one of the two tensile truss materials being on the upper surface of the work gantry and the other being the portability. In addition to being connected to the gantry, the lower end of the compression truss material is connected to the upper surface of the work gantry and is erected vertically.

また、本発明に係る構台支持構造は、前記可搬性構台に作業孔を形成するとともに保護管を吊持する吊持機構を設け、該吊持機構を前記作業構台に対して進退自在に構成することにより、前記保護管を吊持するときには前記吊持機構を前記作業構台から後退させて前記作業孔と同じ平面位置に移動し、前記作業孔を解放するときには前記吊持機構を前記作業構台の方向に前進させて前記作業孔から待避させるように構成したものである。   Further, the gantry support structure according to the present invention is provided with a suspension mechanism that forms a work hole in the portable gantry and suspends a protective tube, and the suspension mechanism is configured to be movable forward and backward with respect to the work gantry. Thus, when the protection tube is suspended, the suspension mechanism is moved backward from the work gantry and moved to the same plane position as the work hole, and when the work hole is released, the suspension mechanism is moved to the work gantry. It is configured to move forward in the direction and retract from the working hole.

また、本発明に係る構台支持構造は、前記吊持機構に位置調整機構を設けることにより、吊持される前記保護管の平面位置を調整できるように構成したものである。   Further, the gantry support structure according to the present invention is configured such that the planar position of the protection tube to be suspended can be adjusted by providing a position adjusting mechanism in the suspension mechanism.

本発明に係る構台支持構造においては、作業構台の上面に上部支持機構を立設し該上部支持機構を介して前記作業構台とほぼ同一高さで該作業構台に水平に隣接された可搬性構台を支持するように構成してある。   In the gantry support structure according to the present invention, the upper support mechanism is erected on the upper surface of the work gantry, and the portable gantry is horizontally adjacent to the work gantry at the same height as the work gantry via the upper support mechanism. It is comprised so that it may support.

そのため、可搬性構台の下方に支柱を設ける必要がなくなり、該可搬性構台の下方を車両が走行する場合であっても、何らその車両の運行を妨げるおそれがない。加えて、支柱を設ける必要がないため、地盤の地耐力を何ら考慮する必要がなくなる。   Therefore, it is not necessary to provide a support column below the portable gantry, and even when the vehicle travels below the portable gantry, there is no possibility of hindering the operation of the vehicle. In addition, since it is not necessary to provide a support, it is not necessary to consider the ground strength of the ground.

上部支持機構は、上部支持機構をトラスで構成するとともに、該トラスを逆V字状に配置される2本の引張トラス材と該2本の引張トラス材が取り合う箇所に頭部が連結された圧縮トラス材とで構成し、前記2本の引張トラス材の内、一方を前記作業構台の上面に、他方を前記可搬性構台に連結するとともに、前記圧縮トラス材の下端を前記作業構台の上面に連結して鉛直に立設した構成とする。   In the upper support mechanism, the upper support mechanism is constituted by a truss, and the head is connected to a location where the two tensile truss members arranged in an inverted V shape and the two tensile truss members meet. A compression truss material, one of the two tensile trusses is connected to the upper surface of the work gantry, the other is connected to the portable gantry, and the lower end of the compression truss material is connected to the upper surface of the work gantry. It is set as the structure erected vertically by connecting to.

可搬性構台は、単なる構台として利用するようにしてもかまわないが、前記可搬性構台に作業孔を形成するとともに保護管を吊持する吊持機構を設け、該吊持機構を前記作業構台に対して進退自在に構成することにより、前記保護管を吊持するときには前記吊持機構を前記作業構台から後退させて前記作業孔と同じ平面位置に移動し、前記作業孔を解放するときには前記吊持機構を前記作業構台の方向に前進させて前記作業孔から待避させるように構成したならば、可搬性構台を利用した杭打作業を効率よく行うことができる。   The portable gantry may be used as a mere gantry, but a working mechanism is formed in the portable gantry and a suspension mechanism for suspending a protective tube is provided, and the suspension mechanism is attached to the working gantry. With respect to the protection tube, when the protection tube is suspended, the suspension mechanism is moved backward from the work gantry and moved to the same plane position as the work hole, and when the work hole is released, the suspension pipe is moved. If the holding mechanism is configured to advance in the direction of the work gantry and retract from the work hole, the pile driving work using the portable gantry can be performed efficiently.

なお、本明細書では上述した記載からもわかるとおり、作業構台に接近する移動を前進、作業構台から離れる移動を後退と呼ぶこととする。   In this specification, as can be seen from the above description, a movement approaching the work gantry is referred to as forward movement, and a movement away from the work gantry is referred to as backward movement.

保護管は、リバース工法であればドリルパイプを挿通するためのものであり、90cm程度の外径があれば十分であり、列車走行の支障とはならない。   If a reverse pipe method is used, the protective tube is for inserting a drill pipe. An outer diameter of about 90 cm is sufficient, and does not hinder train travel.

吊持機構は、地表面の凹部に仮置きされたドリルビットにドリルパイプを連結する作業を行う際、保護管を仮吊持するとともに、それらを連結後、正規の高さ位置まで降ろしてから保護管をその上端近傍で吊持して揺れを防止する役目も果たす。吊持機構は例えばチャックで構成することができるが、可搬性構台からワイヤーで吊持する機構とすることも考えられる。   The suspension mechanism temporarily suspends the protective tube when connecting the drill pipe to the drill bit temporarily placed in the recess on the ground surface, and after connecting them, lowers it to the normal height position. It also serves to prevent shaking by suspending the protective tube near its upper end. The suspension mechanism can be constituted by, for example, a chuck, but it is also conceivable to adopt a mechanism for suspending from a portable gantry with a wire.

さらに、前記吊持機構に位置調整機構を設けることにより、吊持される前記保護管の平面位置を調整できるように構成することができる。   Furthermore, it can comprise so that the planar position of the said protection tube suspended can be adjusted by providing a position adjustment mechanism in the said suspension mechanism.

以下、本発明に係る構台支持構造を車両走行領域内における杭の施工方法及びそれを用いた人工地盤構築方法に適用した場合の実施の形態について、添付図面を参照して説明する。なお、従来技術と実質的に同一の部品等については同一の符号を付してその説明を省略する。   DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which a gantry support structure according to the present invention is applied to a pile construction method and an artificial ground construction method using the same in a vehicle traveling region will be described with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.

図1は、本実施形態に係る構台支持構造を示した図である。同図でわかるように、本実施形態に係る構台支持構造1は、作業構台8の上面に上部支持機構としてのトラス11を立設し該トラスを介して作業構台8とほぼ同一高さで該作業構台に水平に隣接された可搬性構台12を支持するように構成してある。   FIG. 1 is a diagram showing a gantry support structure according to the present embodiment. As can be seen from the figure, the gantry support structure 1 according to the present embodiment has a truss 11 as an upper support mechanism provided upright on the upper surface of the work gantry 8, and the The portable gantry 12 that is horizontally adjacent to the work gantry is supported.

トラス11は、逆V字状に配置される2本の引張トラス材101a,101bと該2本の引張トラス材が取り合う箇所に頭部が連結された圧縮トラス材101cとで構成し、2本の引張トラス材の内、一方の引張トラス材101aを作業構台8の上面に、他方の引張トラス材101bを可搬性構台12に連結するとともに、圧縮トラス材101cの下端を作業構台8の上面に連結して鉛直に立設してある。   The truss 11 is composed of two tensile truss members 101a and 101b arranged in an inverted V shape and a compressed truss member 101c having a head connected to a place where the two tensile truss members meet. Of these tensile trusses, one tensile truss 101a is connected to the upper surface of the work gantry 8, the other tensile truss 101b is connected to the portable gantry 12, and the lower end of the compression truss 101c is connected to the upper surface of the work gantry 8. They are connected and stand vertically.

また、トラス11は図1(c)でよくわかるように、可搬性構台12の両側方にそれぞれ配置してあるとともに、それらの頂部を連結材102で互いに連結してある。   Further, as can be seen in FIG. 1 (c), the truss 11 is arranged on both sides of the portable gantry 12 and the tops thereof are connected to each other by a connecting material 102.

ここで、トラス11の各部材や可搬性構台12に歪みゲージや自動レベル測量装置を取り付けることにより、トラス11や可搬性構台12の変位を常時監視するのが望ましい。   Here, it is desirable to constantly monitor the displacement of the truss 11 and the portable gantry 12 by attaching a strain gauge and an automatic level surveying device to each member of the truss 11 and the portable gantry 12.

可搬性構台12には図2に示すように作業孔13を形成してあるとともに、該作業孔と概ね同じ平面位置に保護管を吊持する吊持機構としてのチャック14を設けてあり、さらにチャック14をスライドガイドレール15,15に沿って進退自在に構成することにより、保護管を吊持するときにはチャック14を作業構台8から後退させて作業孔13と同じ平面位置に移動し、作業孔13を解放するときには、チャック14を作業構台8の方向に前進させて作業孔13から待避させるように構成してある。   The portable gantry 12 is provided with a work hole 13 as shown in FIG. 2 and a chuck 14 as a suspension mechanism for suspending the protective tube at substantially the same plane position as the work hole. By configuring the chuck 14 to be movable back and forth along the slide guide rails 15, 15, when the protective tube is suspended, the chuck 14 is moved backward from the work gantry 8 and moved to the same plane position as the work hole 13. When releasing 13, the chuck 14 is advanced in the direction of the work gantry 8 and retracted from the work hole 13.

また、チャック14には位置調整機構であるシリンダ16,16及びシリンダ17,17を設けることにより、吊持される保護管の平面位置を水平2方向で調整できるように構成してある。   Further, the chuck 14 is provided with cylinders 16 and 16 and cylinders 17 and 17 as position adjusting mechanisms, so that the planar position of the suspended protection tube can be adjusted in two horizontal directions.

本実施形態に係る構台支持構造1を用いて杭の施工及び人工地盤の構築を行う例を以下に説明する。   The example which constructs a pile and constructs an artificial ground using the gantry support structure 1 which concerns on this embodiment is demonstrated below.

すなわち、まず図3に示すように、先行構築された人工地盤1を該人工地盤に延設されるあらたな人工地盤2を構築するための作業構台8とする。   That is, as shown in FIG. 3, first, the artificial ground 1 constructed in advance is used as a work gantry 8 for constructing a new artificial ground 2 extending on the artificial ground.

次に、車両走行領域である線路敷設領域における線路と線路の間に凹部4を例えば深礎工法で掘削形成し、該凹部内にリバース工法用ドリルビット3を仮置きする。   Next, the recess 4 is formed by excavation, for example, by a deep foundation method between the tracks in the track laying region that is the vehicle traveling region, and the reverse method drill bit 3 is temporarily placed in the recess.

リバース工法用ドリルビット3は、クレーン7で凹部4内に吊り込むとともに、例えば凹部4の孔底に敷き込まれたバタ材の上に仮置きするようにすればよい。   The reverse drill bit 3 may be suspended in the recess 4 by the crane 7 and temporarily placed on, for example, a butter material laid on the hole bottom of the recess 4.

かかる凹部4は、杭孔を掘削する地表面での開始点となるため、同図(b)に示すように凹部用覆工板5を凹部4の上に載置して安全を確保するが、かかる凹部用覆工板5には、後述する保護管の下端を接合して該保護管の振れを防止するための保護管連通孔6を形成してある。凹部用覆工板5を載置する範囲には、地盤面に土間コンクリートを打設しておく。   Since this recessed part 4 becomes a starting point on the ground surface where a pile hole is excavated, as shown in the same figure (b), the recessed cover plate 5 is placed on the recessed part 4 to ensure safety. The concave cover plate 5 is formed with a protective tube communication hole 6 for joining a lower end of a protective tube, which will be described later, to prevent the protective tube from shaking. In the area where the concave lining plate 5 is placed, soil concrete is placed on the ground surface.

凹部用覆工板5は、後述するように工事の進捗に応じて随時、仮撤去されたり、再度設置したりされることになる。   As will be described later, the concave lining plate 5 is temporarily removed or installed again as needed according to the progress of the construction.

なお、凹部4を掘削形成するにあたっては、該凹部の掘削及びそれに引き続くリバース工法による杭孔の掘削に伴って列車走行に影響が及ぶことがないよう、必要に応じ公知の方法で線路及びその上を走行する列車荷重を仮桁や仮杭を用いて適宜支持する。   In the excavation and formation of the recess 4, it is necessary to use a publicly known method as necessary so that the train traveling is not affected by the excavation of the recess and the subsequent excavation of the pile hole by the reverse method. The train load traveling on the road is appropriately supported using temporary girders and temporary piles.

次に、図4(a)に示すように作業構台8の上面にトラス11を立設するとともに、可搬性構台12をクレーン7で吊り降ろし、作業構台8とほぼ同一高さとなる位置で静止し、かかる状態で作業構台8にピンジョイントを介して連結するとともに、トラス11を介して可搬性構台12を支持する。   Next, as shown in FIG. 4A, the truss 11 is erected on the upper surface of the work gantry 8, and the portable gantry 12 is suspended by the crane 7, and stops at a position where it is almost the same height as the work gantry 8. In this state, the work base 8 is connected to the work base 8 via a pin joint, and the portable base 12 is supported via a truss 11.

次に、同図に示すように可搬性構台12の作業孔13及びチャック14の中央開口に保護管18を挿通し、次いで、チャック14で保護管18を吊持する。   Next, as shown in the figure, the protective tube 18 is inserted into the working hole 13 of the portable gantry 12 and the central opening of the chuck 14, and then the protective tube 18 is suspended by the chuck 14.

ここで、保護管18を吊持するにあたっては、クレーン7でいったん上述したように吊り込んだ後、チャック14を駆動して保護管18を吊持するとともに、チャック14に設けられた位置調整機構であるシリンダ16,16及びシリンダ17,17を駆動して水平2方向に水平位置を調整する。   Here, when suspending the protective tube 18, the crane 7 is once suspended as described above, and then the chuck 14 is driven to suspend the protective tube 18, and a position adjusting mechanism provided on the chuck 14. The cylinders 16 and 16 and the cylinders 17 and 17 are driven to adjust the horizontal position in two horizontal directions.

次に、図5に示すように、吊持された状態の保護管18内にドリルパイプ21を挿通するとともに該ドリルパイプと送水管22とを凹部用覆工板5に形成された保護管連通孔6に挿通し、しかる後、ドリルパイプ21の先端をドリルビット3に連結する。   Next, as shown in FIG. 5, the drill pipe 21 is inserted into the suspended protection pipe 18, and the drill pipe and the water supply pipe 22 are connected to the protection pipe 5 formed in the concave cover plate 5. After passing through the hole 6, the tip of the drill pipe 21 is connected to the drill bit 3.

送水管22は、保護管18の内面に設けられたパイプ収容部23内に挿通してあり、該パイプ収容部は、保護管18の内面との間にパイプ収容空間が形成されるよう、C字状断面に形成されたガード板を保護管18の内面に取り付けて構成してあり、かかる構成によって、ドリルパイプ21の回転から送水管22を保護することができる。   The water supply pipe 22 is inserted into a pipe housing portion 23 provided on the inner surface of the protective tube 18, and the pipe housing portion is formed so that a pipe housing space is formed between the pipe housing portion and the inner surface of the protective tube 18. A guard plate formed in a letter-shaped cross section is configured to be attached to the inner surface of the protective tube 18, and with this configuration, the water supply tube 22 can be protected from the rotation of the drill pipe 21.

次に、凹部4の上に凹部用覆工板5を設置し、次いでチャック14を緩めて保護管18を降ろし、その下端を凹部用覆工板5に形成された保護管連通孔6に接合する。   Next, the concave cover plate 5 is installed on the concave portion 4, the chuck 14 is then loosened, the protective tube 18 is lowered, and the lower end thereof is joined to the protective tube communication hole 6 formed in the concave cover plate 5. To do.

チャック14に設けられたシリンダ16,16及びシリンダ17,17による保護管18の水平2方向調整は、保護管18の下端がこの保護管連通孔6にちょうど接合できるよう、予め水平位置を決めておくものである。   The horizontal two-way adjustment of the protective tube 18 by the cylinders 16 and 16 and the cylinders 17 and 17 provided on the chuck 14 is determined in advance so that the lower end of the protective tube 18 can be joined to the protective tube communication hole 6 in advance. It is something to keep.

このように保護管18の下端を凹部用覆工板5の保護管連通孔6に接合した後は、再度チャック14で保護管18を吊持して固定する。   After the lower end of the protective tube 18 is thus joined to the protective tube communication hole 6 of the recessed cover plate 5, the protective tube 18 is again suspended and fixed by the chuck 14.

かかる状態においては、保護管18は、その上端においてチャック14で固定され、下端において凹部用覆工板5で固定されることとなり、ドリルパイプ21の回転に伴う振動が発生したとしても、保護管18を安全に保持しておくことが可能となる。   In such a state, the protective tube 18 is fixed at the upper end by the chuck 14 and fixed at the lower end by the recessed cover plate 5, so that even if vibration occurs due to the rotation of the drill pipe 21, the protective tube 18 is protected. 18 can be held safely.

これら一連のステップ101〜ステップ106は、列車の運行がない深夜時間帯に行うのが望ましい。   These series of steps 101 to 106 are preferably performed in the midnight hours when there is no train operation.

以下、この状態でリバース工法により杭孔の削孔を行う。   Hereinafter, the pile hole is drilled by the reverse method in this state.

すなわち、上述した状態で送水管22から注水を行いながら、図6に示すようにロータリーテーブル31でドリルパイプ21を回転させることにより、該ドリルパイプに連結されたドリルビット3で杭孔を掘削し、掘削ずりが混入した坑内の泥水をドリルビット3に内蔵されたポンプ(図示せず)により、ドリルパイプ21内の中空空間を介して地上に揚水する。   That is, while pouring water from the water supply pipe 22 in the above-described state, the drill pipe 21 is rotated by the rotary table 31 as shown in FIG. 6, thereby drilling the pile hole with the drill bit 3 connected to the drill pipe. Then, muddy water in the mine mixed with excavation shear is pumped to the ground through a hollow space in the drill pipe 21 by a pump (not shown) built in the drill bit 3.

ここで、ロータリーテーブル31は、ベースマシン32に取り付けられたリーダー33に昇降自在に取り付ける形態で可搬性構台上に設けることができる。   Here, the rotary table 31 can be provided on the portable gantry in such a manner that it can be moved up and down on a reader 33 attached to the base machine 32.

かかるステップ107は、ドリルパイプ21を回転させることによりドリルビット3で孔底を掘り下げるリバース工法による掘削作業となるが、ドリルパイプ21が保護管18内に挿入してあるとともに泥水もドリルパイプ21内の中空空間を介して揚泥されるため、掘削作業の安全が確保されている。そのため、かかる工程は、列車運行時間帯に行うことができる。   Such a step 107 is a drilling operation by a reverse method in which the drill bit 3 is dug down by rotating the drill pipe 21, but the drill pipe 21 is inserted into the protective pipe 18 and muddy water also enters the drill pipe 21. Since the mud is pumped through the hollow space, the safety of excavation work is ensured. Therefore, this process can be performed during train operation hours.

掘削終了後、凹部用覆工板5及び保護管18を仮撤去するとともに、ドリルパイプ21及びドリルビット3を撤去する。   After the excavation is completed, the recessed cover plate 5 and the protective tube 18 are temporarily removed, and the drill pipe 21 and the drill bit 3 are removed.

次に、図7に示すように可搬性構台12に形成された作業孔13を介して杭孔に鉄筋籠41を建て込む。鉄筋籠41を建て込むにあたっては、該鉄筋籠の体積に相当する量の泥水があふれないよう、サンドポンプ42を凹部4内に設置して孔内の泥水を適宜揚泥しながら行う。   Next, as shown in FIG. 7, the reinforcing bar 41 is built into the pile hole through the work hole 13 formed in the portable gantry 12. In order to build the reinforcing bar 41, the sand pump 42 is installed in the recess 4 so that the amount of mud corresponding to the volume of the reinforcing bar does not overflow, and the mud in the hole is appropriately pumped.

次に、図8に示すように保護管18を再び作業孔13から建て込み、チャック14で吊持する。   Next, as shown in FIG. 8, the protective tube 18 is built again from the work hole 13 and suspended by the chuck 14.

ここで、保護管18を建て込むにあたっては、該保護管内のパイプ収容部23に挿通された揚泥管51を凹部用覆工板5の保護管連通孔6に通した上、該揚泥管の下端をサンドポンプ42につなぐ。   Here, when the protective pipe 18 is built, the mud pipe 51 inserted through the pipe housing portion 23 in the protective pipe is passed through the protective pipe communication hole 6 of the lining plate 5 for the recess, and then the mud pipe Is connected to the sand pump 42.

次に、かかる状態にて杭孔の上に凹部用覆工板5を置き、次いで保護管18の下端を該凹部用覆工板の保護管連通孔6に接合した後、保護管18内にトレミー管52を挿入する。   Next, in this state, the recessed cover plate 5 is placed on the pile hole, and then the lower end of the protective tube 18 is joined to the protective tube communication hole 6 of the recessed cover plate, The tremy tube 52 is inserted.

これら一連のステップ108〜ステップ111は、列車の運行がない深夜時間帯に行うのが望ましい。   These series of steps 108 to 111 are preferably performed in the midnight hours when there is no train operation.

次に、トレミー管52を介して水中コンクリート打設を行いつつ、サンドポンプ42で杭孔内の泥水を揚泥管51を介して地上に揚泥する。かかるステップ112はコンクリート打設作業となるが、トレミー管52が保護管18内に挿入してあるとともに、泥水も保護管18内のパイプ収容部23に挿通された揚泥管51を介して揚泥されるため、コンクリート作業の安全が確保されている。そのため、かかる工程は、列車運行時間帯に行うことができる。   Next, the muddy water in the pile hole is pumped up to the ground through the mud pipe 51 while the underwater concrete is placed through the tremy pipe 52. The step 112 is a concrete placing operation, and the tremy pipe 52 is inserted into the protective pipe 18 and mud is also lifted through the pumping mud pipe 51 inserted into the pipe housing portion 23 in the protective pipe 18. Because it is mud, the safety of concrete work is secured. Therefore, this process can be performed during train operation hours.

水中コンクリートを硬化させて現場打ちRC杭61を施工した後は、図9に示すように可搬性構台12、保護管18、凹部用覆工板5及びトラス7を撤去するとともに、RC杭61の天端にアンカー62を貫入し、該アンカーを用いて鉄骨柱71をRC杭61の頂部に立設するとともに、凹部4内にコンクリートを充填する。   After the underwater concrete is hardened and the in-situ RC pile 61 is constructed, as shown in FIG. 9, the portable gantry 12, the protective tube 18, the recessed cover plate 5 and the truss 7 are removed, and the RC pile 61 An anchor 62 is inserted into the top end, and the steel column 71 is erected on the top of the RC pile 61 using the anchor, and concrete is filled in the recess 4.

次に、作業構台8の鉄骨梁からあらたな鉄骨梁72を延設して該鉄骨梁を鉄骨柱71で支持するとともに、図11に示すように、あらたに延設された鉄骨梁72に床板81を敷設してあらたな人工地盤とする。   Next, a new steel beam 72 is extended from the steel beam of the work gantry 8, and the steel beam is supported by the steel column 71. As shown in FIG. 11, the floor plate is attached to the newly extended steel beam 72. 81 will be laid to create a new artificial ground.

これらステップ113〜114は、列車の運行がない深夜時間帯に行うのが望ましい。   These steps 113 to 114 are preferably performed in the midnight hours when there is no train operation.

以上説明したように、本実施形態に係る構台支持構造1によれば、可搬性構台12をトラス11で支持するようにしたので、可搬性構台12を支持するための余計な支柱を線路敷設領域に立設する必要がなくなる。   As described above, according to the gantry support structure 1 according to the present embodiment, since the portable gantry 12 is supported by the truss 11, an extra column for supporting the portable gantry 12 is provided in the line laying region. It is no longer necessary to stand up.

したがって、列車の運行を妨げる懸念がなくなるとともに、列車走行の安全性を全く損なうことなく、しかも、杭の施工と人工地盤の構築とを、営業路線の運行時間帯と非運行時間帯とで使い分けながら全体として連続施工することができるので、杭の施工及び人工地盤の構築を短工期に行うことが可能となる。   Therefore, there is no concern that the operation of the train will be hindered, the safety of train operation will not be impaired at all, and the construction of the pile and the construction of the artificial ground will be used separately for the operating time zone and non-operating time zone of the business route However, since it can be continuously constructed as a whole, construction of piles and construction of artificial ground can be performed in a short construction period.

加えて、支柱を設ける必要がないため、地盤の地耐力を何ら考慮する必要がなくなるとともに、それに関連して地盤沈下を懸念する必要もなくなる。   In addition, since it is not necessary to provide a support, it is not necessary to consider the ground strength of the ground, and there is no need to worry about ground subsidence.

本実施形態に係る構台支持構造を示した図であり、(a)は側面図、(b)は平面図、(c)はA−A線方向から見た矢視図。It is the figure which showed the gantry support structure which concerns on this embodiment, (a) is a side view, (b) is a top view, (c) is the arrow line view seen from the AA line direction. 可搬性構台12の平面図。The top view of the portable gantry 12. FIG. 本実施形態に係る構台支持構造を用いて人工地盤を構築する手順を示した作業図。The work figure which showed the procedure which constructs | assembles artificial ground using the gantry support structure which concerns on this embodiment. 本実施形態に係る構台支持構造を用いて人工地盤を構築する手順を示した作業図。The work figure which showed the procedure which constructs | assembles artificial ground using the gantry support structure which concerns on this embodiment. 本実施形態に係る構台支持構造を用いて人工地盤を構築する手順を示した作業図。The work figure which showed the procedure which constructs | assembles artificial ground using the gantry support structure which concerns on this embodiment. 本実施形態に係る構台支持構造を用いて人工地盤を構築する手順を示した作業図。The work figure which showed the procedure which constructs | assembles artificial ground using the gantry support structure which concerns on this embodiment. 本実施形態に係る構台支持構造を用いて人工地盤を構築する手順を示した作業図。The work figure which showed the procedure which constructs | assembles artificial ground using the gantry support structure which concerns on this embodiment. 本実施形態に係る構台支持構造を用いて人工地盤を構築する手順を示した作業図。The work figure which showed the procedure which constructs | assembles artificial ground using the gantry support structure which concerns on this embodiment. 本実施形態に係る構台支持構造を用いて人工地盤を構築する手順を示した作業図。The work figure which showed the procedure which constructs | assembles artificial ground using the gantry support structure which concerns on this embodiment. 本実施形態に係る構台支持構造を用いて人工地盤を構築する手順を示した作業図。The work figure which showed the procedure which constructs | assembles artificial ground using the gantry support structure which concerns on this embodiment. 本実施形態に係る構台支持構造を用いて人工地盤を構築する手順を示した作業図。The work figure which showed the procedure which constructs | assembles artificial ground using the gantry support structure which concerns on this embodiment.

符号の説明Explanation of symbols

1 構台支持構造
11 トラス(上部支持機構)
12 可搬性構台
13 作業孔
14 チャック(吊持機構)
101a,101b 引張トラス材
101c 圧縮トラス材
16,16 シリンダ(位置調整機構)
17,17 シリンダ(位置調整機構)
1 Gantry support structure 11 Truss (upper support mechanism)
12 Portable gantry 13 Work hole 14 Chuck (Hanging mechanism)
101a, 101b tensile truss material 101c compression truss material 16, 16 cylinder (position adjustment mechanism)
17, 17 Cylinder (Position adjustment mechanism)

Claims (3)

作業構台の上面に上部支持機構を立設し該上部支持機構を介して前記作業構台とほぼ同一高さで該作業構台に水平に隣接された可搬性構台を支持するように構成し、前記上部支持機構をトラスで構成するとともに、該トラスを逆V字状に配置される2本の引張トラス材と該2本の引張トラス材が取り合う箇所に頭部が連結された圧縮トラス材とで構成し、前記2本の引張トラス材の内、一方を前記作業構台の上面に、他方を前記可搬性構台に連結するとともに、前記圧縮トラス材の下端を前記作業構台の上面に連結して鉛直に立設したことを特徴とする構台支持構造。 An upper support mechanism is erected on the upper surface of the work gantry, and is configured to support a portable gantry horizontally adjacent to the work gantry at the same height as the work gantry via the upper support mechanism. The support mechanism is composed of a truss, and the truss is composed of two tensile truss members arranged in an inverted V shape and a compression truss member having a head connected to a place where the two tensile truss members meet. One of the two tensile trusses is connected to the upper surface of the work gantry, the other is connected to the portable gantry, and the lower end of the compression truss material is connected to the upper surface of the work gantry to vertically A gantry support structure characterized by standing. 前記可搬性構台に作業孔を形成するとともに保護管を吊持する吊持機構を設け、該吊持機構を前記作業構台に対して進退自在に構成することにより、前記保護管を吊持するときには前記吊持機構を前記作業構台から後退させて前記作業孔と同じ平面位置に移動し、前記作業孔を解放するときには前記吊持機構を前記作業構台の方向に前進させて前記作業孔から待避させるように構成した請求項1記載の構台支持構造。 When suspending the protective tube by forming a working hole in the portable gantry and providing a suspending mechanism for suspending the protective tube, the suspending mechanism being configured to be movable forward and backward with respect to the working gantry. The suspension mechanism is retracted from the work gantry and moved to the same plane position as the work hole. When the work hole is released, the suspension mechanism is advanced in the direction of the work gantry and retracted from the work hole. The gantry support structure according to claim 1 configured as described above. 前記吊持機構に位置調整機構を設けることにより、吊持される前記保護管の平面位置を調整できるように構成した請求項2記載の構台支持構造。 The gantry support structure according to claim 2, wherein a position adjustment mechanism is provided in the suspension mechanism so that a planar position of the suspended protection tube can be adjusted.
JP2004271881A 2004-09-17 2004-09-17 Gantry support structure Expired - Fee Related JP3968663B2 (en)

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