JP5028323B2 - Ground anchor method - Google Patents

Ground anchor method Download PDF

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JP5028323B2
JP5028323B2 JP2008109026A JP2008109026A JP5028323B2 JP 5028323 B2 JP5028323 B2 JP 5028323B2 JP 2008109026 A JP2008109026 A JP 2008109026A JP 2008109026 A JP2008109026 A JP 2008109026A JP 5028323 B2 JP5028323 B2 JP 5028323B2
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fixing
slope
tensile
anchor
mold
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JP2009257006A (en
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雅志 佐々木
清 鈴木
晃 福田
卓嗣 濱田
啓之 鈴木
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雅志 佐々木
株式会社ダイクレ
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本発明は、法面安定化のため法面に施工されるグラウンドアンカー工法に関する。   The present invention relates to a ground anchor method for construction on a slope for stabilizing the slope.
グラウンドアンカー工法は、一般に次のようにして行われる。
地山の法面にアンカー孔を削孔したのち、アンカー孔内にPC鋼線等の引張材を挿入し、ついでアンカー孔内にモルタル等のグラウト材を注入して引張材先端部を地中に定着する。定着後、アンカー孔から突出する引張材に受圧板を差込み、締着具で締め込んで引張材を緊張し定着する。この工法は、引張材の引張力の反力を受圧板で支持するもので、その一例が下記特許文献1に開示され、受圧板としては、プレキャストコンクリートブロックや鋼製、アルミ製、FRP製等のものが用いられ、また現場にてコンクリートを打設する鉄筋コンクリート製のものも知られる。
特公平5−85696号
The ground anchor method is generally performed as follows.
After drilling the anchor hole on the slope of the natural ground, insert a tensile material such as PC steel wire into the anchor hole, and then inject a grout material such as mortar into the anchor hole to place the tip of the tensile material underground To settle. After fixing, the pressure receiving plate is inserted into the tensile material protruding from the anchor hole, and tightened with a fastener to tension and fix the tensile material. This construction method supports the reaction force of the tensile force of the tensile material with a pressure receiving plate, an example of which is disclosed in the following Patent Document 1, and as the pressure receiving plate, a precast concrete block, steel, aluminum, FRP, etc. The one made of reinforced concrete is also known.
Japanese Patent Publication No.5-85696
受圧板のうち、軽量なものは、引張材の引張力の反力に耐える耐力の点で難点があるのに対し、プレキャストコンクリートブロックや鋼製の受圧板は、引張材の引張力の十分な反力に耐え得るが、重量が嵩んで法面に施工する際には、クレーン等を設置する必要があるうえ、施工現場まで資材を搬入するのも容易でない。また法面に凹凸があると、法面と受圧板との間に不陸が生ずる。これに対し、現場にてコンクリートを打設する鉄筋コンクリート製の受圧板は、個々の資材の搬入が容易で、クレーンを設置しなくても施工でき、なによりも安価で、また法面が多少凹凸になっていても法面と不陸になることはないが、施工に際しては、型枠を組付けたり、組付けた型枠が崩れないように支持する支保工が必要で、勾配のきつい法面においては、このような作業を行うのは容易でない。   The light pressure plate has a weak point in terms of yield strength to withstand the reaction force of the tensile force of the tensile material, while the precast concrete block and steel pressure plate have sufficient tensile force of the tensile material. Although it can withstand the reaction force, it is heavy and it is not easy to carry materials to the construction site in addition to installing a crane or the like when constructing on a slope. If the slope is uneven, unevenness occurs between the slope and the pressure plate. In contrast, a reinforced concrete pressure plate for placing concrete on-site is easy to carry individual materials, can be installed without a crane, is cheaper, and has a slightly uneven slope. Even if it is, it will not become uneven with the slope, but at the time of construction, it is necessary to assemble the formwork or support work to prevent the assembled formwork from collapsing, and the method with a steep slope On the surface, it is not easy to perform such work.
本発明は、現場にてコンクリートを打設する鉄筋コンクリート製の受圧板における上記の利点を生かす一方で、支保工を不要にしてより安価に提供できるグラウンドアンカー工法を提供することを目的とする。   An object of the present invention is to provide a ground anchor method that can provide the above-described advantages of a pressure-receiving plate made of reinforced concrete in which concrete is placed on site, and can be provided more inexpensively without requiring a support work.
請求項1に係る発明は、地山の法面にアンカー孔を削孔したのち、該アンカー孔内に引張材を挿入して定着する工程と、縦桟と横桟を格子状に組み合わせるか、或いはグレーチングよりなる構造体及び該構造体に連結材を介して連結される支圧板を有する定着体を用い、該定着体をアンカー孔より突出する引張材に差込んで前記構造体を法面に設置したのち、前記定着体より突出する引張材を締着具により定着する工程と、前記定着体の周りに型枠を設置し、定着体と型枠を連結具により連結する工程と、型枠内に鉄筋を配筋したのち、コンクリートを定着体のうち、少なくとも支圧板表面が露出するように打設する工程とよりなることを特徴とする。   The invention according to claim 1 is the step of cutting the anchor hole on the slope of the natural ground, and then inserting and fixing the tensile material in the anchor hole, or combining the vertical beam and the horizontal beam in a grid pattern, Alternatively, a fixing body having a structure made of grating and a pressure bearing plate connected to the structure through a connecting material is used, and the fixing body is inserted into a tensile material protruding from an anchor hole so that the structure becomes a slope. A step of fixing a tension member protruding from the fixing body with a fastening tool after installation, a step of installing a mold around the fixing body, and connecting the fixing body and the mold with a connector; It is characterized by comprising a step of placing a reinforcing bar inside and placing concrete so that at least the surface of the bearing plate of the fixing body is exposed.
請求項2に係る発明は、請求項1に係る発明において、構造体を構成する縦桟と横桟またはグレーチングの主部材は、そのうちの少なくとも一部が断面を先細り状となし、法面に容易に食い込み可能であることを特徴とする。   The invention according to claim 2 is the invention according to claim 1, wherein at least a part of the main members of the vertical beam and the horizontal beam or the grating constituting the structure has a tapered cross section and is easy to be sloped. It is characterized by being able to bite into.
請求項3に係る発明は、請求項1又は2に係る発明において、構造体には側方に突出して法面への食い込み量を規制するストッパーが設けられることを特徴とする。   The invention according to claim 3 is characterized in that, in the invention according to claim 1 or 2, the structure is provided with a stopper that protrudes laterally and restricts the amount of biting into the slope.
請求項4に係る発明は、請求項1ないし3に係る発明において、定着体には引張材を通すパイプが取付けられ、コンクリートがパイプ外の型枠内に打設されることを特徴とする。   The invention according to claim 4 is the invention according to claims 1 to 3, characterized in that the fixing member is provided with a pipe through which a tensile material is passed, and the concrete is placed in a mold outside the pipe.
請求項1に係る発明によると、型枠内へのコンクリートの打設により鉄筋コンクリート製の受圧板が形成されるが、コンクリート打設に際し組み付けられる型枠は定着体に連結具により連結されて支持され、支保工を必要としない。また受圧板を形成するための、定着体、定着具、型枠、鉄筋等の個々の資材は、構築された鉄筋コンクリート製の受圧板に比べ、軽量で嵩張らないため現場への搬入が容易であり、クレーンを設置しなくても施工できて安価である。更に法面が多少凹凸になっていても、不陸になることがない。   According to the first aspect of the present invention, the pressure receiving plate made of reinforced concrete is formed by placing concrete in the mold, but the mold to be assembled at the time of placing the concrete is supported by being connected to the fixing body by the connector. No support work is required. In addition, each material such as a fixing body, fixing tool, formwork, and reinforcing bar for forming the pressure receiving plate is lighter and less bulky than the constructed pressure receiving plate made of reinforced concrete, so it can be easily brought into the field. It can be constructed without a crane and is inexpensive. Furthermore, even if the slope is somewhat uneven, it does not become uneven.
請求項2に係る発明によると、定着体が法面への取付時、法面に食い込み易くなり、仮止めされて法面よりずり落ちるのを防止することができる。   According to the second aspect of the present invention, when the fixing body is attached to the slope, it is easy to bite into the slope, and it is possible to prevent the fixing body from temporarily slipping and falling off the slope.
請求項3に係る発明によると、定着体の法面への食い込みを一定に規制することができ、これにより鉄筋コンクリート製受圧板の厚み(法面からの高さ)を一定にすることができる。   According to the third aspect of the present invention, the biting of the fixing body into the slope can be regulated to a certain level, and thereby the thickness (height from the slope) of the reinforced concrete pressure receiving plate can be kept constant.
請求項4に係る発明によると、引張材をパイプに通し、パイプで取囲むことによりコンクリート打設時にコンクリートが引張材に付着するのが防止され、定着具による定着に支障を生ずることがない。   According to the fourth aspect of the present invention, the tensile material is passed through the pipe and surrounded by the pipe, so that the concrete is prevented from adhering to the tensile material at the time of placing the concrete, and the fixing by the fixing tool is not hindered.
以下、本発明の実施形態について図面により説明する。
図1は、全体を符号1で示す定着体の平面、図2は法面に取付けた定着体1の断面を示すもので、定着体1は縦桟2aと横桟2bを中心部を除いて格子状に組み合わせ、中心部に矩形の開口部3を形成した鋼製の構造体2または中心部に開口部3を設けたグレーチング(これらを以下単に構造体という)と、開口部3の四隅より立設される鋼管よりなる連結材4を介して構造体2に連結され、中心部に前記開口部3と同軸の透孔5を形成し、かつ周縁に側方に突出する取付部8を取付けた支圧板6と、前記構造体2の側面に固着され、構造体2の中間部より側方に突出する部分がストッパーとしての機能を果たす山形鋼7とからなっている。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view of a fixing body generally indicated by reference numeral 1, and FIG. 2 is a cross-sectional view of the fixing body 1 attached to a slope. The fixing body 1 includes a vertical beam 2a and a horizontal beam 2b except for the central portion. Combined in a lattice form, a steel structure 2 having a rectangular opening 3 in the center, or a grating (hereinafter simply referred to as a structure) provided with an opening 3 in the center, and from the four corners of the opening 3 Connected to the structure 2 through a connecting member 4 made of a standing steel pipe, a through hole 5 coaxial with the opening 3 is formed at the center, and a mounting portion 8 protruding laterally is attached to the periphery. The support plate 6 and the angle steel 7 fixed to the side surface of the structure 2 and projecting to the side from the intermediate portion of the structure 2 serve as a stopper.
前述の縦桟2aと横桟2bまたは主部材は、図2に示す例では断面I形をなしているが、図3に示すようなフラットバーであってもよい。好ましくは図4に示すような断面が先細りの楔状に形成される。   The vertical bars 2a and the horizontal bars 2b or the main members described above have an I-shaped cross section in the example shown in FIG. 2, but may be flat bars as shown in FIG. Preferably, the cross section as shown in FIG. 4 is formed in a tapered wedge shape.
前記支圧板6は構造体2に開口部四隅の連結材4を介して連結されているが、開口部周縁又は開口部内側に固着される鋼管製の1つの連結材により連結してもよい。   The bearing plate 6 is connected to the structure 2 via the connecting members 4 at the four corners of the opening, but may be connected by one connecting member made of steel pipe fixed to the periphery of the opening or the inside of the opening.
また山形鋼7は図1に示す例では、定着体1の四側面に取付けられているが、図5に示すように対向する二側面にのみ取付けてもよい。   Further, in the example shown in FIG. 1, the angle steel 7 is attached to the four side surfaces of the fixing body 1, but may be attached only to two opposite side surfaces as shown in FIG. 5.
次に前記定着体1を用いたグラウンドアンカー工法について説明する。
先ず、常法により図6に示すように、法面にアンカー孔9を削孔し、該孔の孔底にモルタル等のグラウト材11を注入する。ついでアンカー孔9内にPC鋼線よりなる引張材12を挿入し、その先端部をグラウト材内に押し込んで定着させる。
Next, a ground anchor method using the fixing body 1 will be described.
First, as shown in FIG. 6, an anchor hole 9 is drilled on the slope and a grout material 11 such as mortar is poured into the bottom of the hole. Next, a tensile material 12 made of PC steel wire is inserted into the anchor hole 9, and the tip portion is pushed into the grout material and fixed.
次にアンカー孔9より突出する引張材12の突出部分に図2に示す定着体2の開口部3及び透孔5を通すようにして該定着体2を法面に設置する。設置に際しては、構造体2を押し込んで該構造体2を構成する縦桟2a及び横桟2b(構造体がグレーチングである場合、グレーチングを構成する主部材)の先端を法面に食い込ませる。これにより定着体1が法面に仮止めされ、法面よりずり落ちることがない。なお、構造体2の縦桟2a及び横桟2bまたは主部材は、そのうちの一部好ましくは全部を先細り状に形成すれば、法面への食い込みが容易となる。構造体2の法面への食い込みは、山形鋼7の側方に突出する部分がストッパーとしての機能を果たし、該部によって法面への食い込み量が規制され、該部が法面に当たる限度まで食い込み可能となる。法面の地盤が軟弱である場合、縦桟2a及び横桟2bまたは主部材を先細り状に形成する必要がない。この場合、山形鋼のストッパーとしての機能を果たす部分は幅広にしてストッパーとしての機能を確実に果たすようにする必要がある。定着体1を取付後、プラスチック製、紙製、金属製等のパイプ16を引張材12に上方より通し、前記透孔5及び構造体2の開口部3に装入する。   Next, the fixing member 2 is installed on the slope so that the opening 3 and the through hole 5 of the fixing member 2 shown in FIG. At the time of installation, the structure 2 is pushed in, and the front ends of the vertical beam 2a and the horizontal beam 2b (the main member that constitutes the grating when the structure is grating) are bitten into the slope. As a result, the fixing body 1 is temporarily fixed to the slope and does not slide down from the slope. In addition, if the vertical beam 2a and the horizontal beam 2b or the main member of the structure 2 are formed in a part, preferably all, in a tapered shape, the biting into the slope becomes easy. As for the bite into the slope of the structure 2, the part protruding to the side of the angle steel 7 functions as a stopper, the amount of bite into the slope is regulated by this part, and the part hits the slope It becomes possible to bite in. When the slope ground is soft, it is not necessary to taper the vertical beam 2a and the horizontal beam 2b or the main member. In this case, it is necessary to make the portion serving as the stopper of the angle iron wider so as to reliably perform the function as the stopper. After attaching the fixing body 1, a pipe 16 made of plastic, paper, metal, or the like is passed through the tension member 12 from above and inserted into the through hole 5 and the opening 3 of the structure 2.
その後、定着体1の周りに型枠15を組み、定着体1と型枠15を鉄筋等の連結具17により連結する(図6)。連結具17を定着体1、連結材4、パイプ16、支圧板6等に取付けるには、例えば支圧板6に取付けられる取付部8(図1参照)を定着体1、連結材4或いはパイプ16等に取付け、各取付部8にボルトやネジ等の止着具によって取付けるか、或いは溶接等によって取付けられ、型枠15への取付けは、溶接や図6に示すようなボルトやネジ等の止着具19により行われる。   Thereafter, the mold 15 is assembled around the fixing body 1, and the fixing body 1 and the mold 15 are connected by a connecting tool 17 such as a reinforcing bar (FIG. 6). In order to attach the connector 17 to the fixing body 1, the connecting material 4, the pipe 16, the bearing plate 6, etc., for example, the mounting portion 8 (see FIG. 1) attached to the bearing plate 6 is used. Are attached to each mounting portion 8 by fastening means such as bolts and screws, or are attached by welding or the like, and are attached to the formwork 15 by welding or fixing bolts or screws as shown in FIG. Performed by the dressing 19.
定着体1の周りに型枠15を組付け後、型枠15内に鉄筋18を配筋する。鉄筋18を配筋する際は、連結具17についても同じであるが、定着体1、連結材4、パイプ16、支圧板6等に取付部8を取付け、該取付部8に取付けるようにするのが望ましい。これにより鉄筋取付時の位置決めや取付けが容易となる。配筋後、型枠15を被せ蓋をする。この型枠15は型枠下面が支圧板6下面と面一となるようにして組付けられる。その後、法面の上側に位置する型枠15にあけられた孔20を通して型枠内にコンクリートを打設する。コンクリート打設時、引張材12はパイプ16に通されているため、コンクリートが付着するのが防止される。養生後、各型枠15が取外され、その後、支圧板6の透孔5より突出する引張材12に締着具13を取付け、支圧板上で引張材12を緊張させて定着する(図7)。こうして鉄筋コンクリート製の受圧板21が構築される。   After assembling the mold 15 around the fixing body 1, the reinforcing bars 18 are arranged in the mold 15. When the reinforcing bars 18 are arranged, the same applies to the connector 17, but the attachment portion 8 is attached to the fixing body 1, the connection member 4, the pipe 16, the bearing plate 6, and the like, and is attached to the attachment portion 8. Is desirable. Thereby, positioning and attachment at the time of reinforcing bar attachment become easy. After the bar arrangement, the mold 15 is covered and covered. The mold 15 is assembled so that the lower surface of the mold is flush with the lower surface of the support plate 6. Thereafter, concrete is placed in the mold through holes 20 formed in the mold 15 located on the upper side of the slope. Since the tension member 12 is passed through the pipe 16 at the time of placing the concrete, the concrete is prevented from adhering. After curing, each mold 15 is removed, and then a fastener 13 is attached to the tension member 12 protruding from the through hole 5 of the bearing plate 6 and the tension member 12 is tensioned and fixed on the bearing plate (FIG. 7). In this way, the pressure-receiving plate 21 made of reinforced concrete is constructed.
本工法によると、型枠15は定着体1に連結具17により連結されるため支保工を必要とせず、また定着体1、パイプ16、型枠15、締着具13、鉄筋18、連結具17等、個々の資材は、比較的軽量で嵩張らないため、現場への搬入が容易であり、クレーンを設置しなくても組み付けできること、定着体1は構造体2の桟2a、2bまたは主部材を法面に押し込んで食い込ませることにより仮止め状態で法面に取付けられ、法面よりずり落ちるのが防止されるうえ、法面への食い込みは、山形鋼7の側方に突出する部分がストッパーとなって規制され、一定以上の厚みの受圧板を製作できること、引張材12はパイプ16に通されることによりコンクリート打設時にコンクリートが付着するのが防止され、定着具による定着に支障を生ずることがないこと、法面が図示するように多少凹凸になっていてもコンクリートが充填されることにより受圧板と法面との不陸が生ずることがないこと等の効果を有する。   According to this construction method, the formwork 15 is connected to the fixing body 1 by the connecting member 17, so that no support work is required, and the fixing body 1, the pipe 16, the formwork 15, the fastening tool 13, the reinforcing bar 18, and the connecting tool. The individual materials such as 17 are relatively light and not bulky, so that they can be easily carried into the site, can be assembled without installing a crane, and the fixing body 1 can be a beam 2a, 2b of the structure 2 or a main member. It is attached to the slope in a temporarily fixed state by pushing it into the slope, and it is prevented from slipping off the slope, and the part protruding to the side of the angle steel 7 is a stopper. The pressure receiving plate with a certain thickness or more can be manufactured, and the tension member 12 is passed through the pipe 16 to prevent the concrete from adhering to the concrete when it is placed. Z It is not, have an effect such as has never uneven surface of the pressure receiving plate and the slope is produced by the concrete be made somewhat uneven as slope is shown, it is filled.
定着体の平面図。The top view of a fixing body. 法面に定着体を取付けた断面図。Sectional drawing which attached the fixing body to the slope. 構造体の縦桟又は横桟の断面図。Sectional drawing of the vertical beam or horizontal beam of a structure. 縦桟又は横桟の別の例の断面図。Sectional drawing of another example of a vertical beam or a horizontal beam. 定着体の別の態様の平面図。The top view of another aspect of a fixing body. 型枠を組み付けた断面図。Sectional drawing which assembled | attached the formwork. 構築された受圧板の断面図。Sectional drawing of the constructed pressure receiving plate.
符号の説明Explanation of symbols
1・・定着体
2・・構造体
2a・・縦桟
2b・・横桟
3・・開口部
4・・連結部
5・・透孔
6・・支圧板
7・・山形鋼
8・・取付部
9・・アンカー孔
11・・グラウト材
12・・引張材
13・・締着具
15・・型枠
16・・パイプ
17・・連結具
18・・鉄筋
19・・止着具
20・・孔
21・・受圧板
1 .. Fixing body 2.. Structure 2 a.. Vertical beam 2 b.. Horizontal beam 3. Opening 4. Connection portion 5. Through hole 6. Supporting plate 7. 9 .. Anchor hole 11. Grout material 12. Tensile material 13. Fastener 15. Form 16. Pipe 17. Connection 18. Reinforcing bar 19. Fastener 20. ..Pressure plate

Claims (4)

  1. 地山の法面にアンカー孔を削孔したのち、該アンカー孔内に引張材を挿入して定着する工程と、縦桟と横桟を格子状に組み合わせるか、或いはグレーチングよりなる構造体及び該構造体に連結材を介して連結される支圧板を有する定着体を用い、該定着体をアンカー孔より突出する引張材に差込んで前記構造体を法面に設置したのち、前記定着体より突出する引張材を締着具により定着する工程と、前記定着体の周りに型枠を設置し、定着体と型枠を連結具により連結する工程と、型枠内に鉄筋を配筋したのち、コンクリートを定着体のうち、少なくとも支圧板が露出するように打設する工程とよりなることを特徴とするグラウンドアンカー工法。   After drilling an anchor hole on the slope of the natural ground, a step of inserting and fixing a tensile material into the anchor hole, combining a vertical beam and a horizontal beam in a lattice shape, or a structure made of grating and the structure Using a fixing body having a support plate connected to the structure via a connecting material, inserting the fixing body into a tensile material protruding from an anchor hole, and placing the structure on a slope, After fixing the protruding tension material with the fastening tool, installing the mold around the fixing body, connecting the fixing body and the mold with the connecting tool, and arranging the reinforcing bars in the mold A ground anchor method comprising: placing concrete so that at least the bearing plate of the fixing body is exposed.
  2. 構造体を構成する縦桟と横桟またはグレーチングの主部材は、そのうちの少なくとも一部が断面を先細り状となし、法面に容易に食い込み可能であることを特徴とする請求項1記載のグラウンドアンカー工法。   The ground member according to claim 1, wherein at least a part of the main members of the vertical beam and the horizontal beam or the grating constituting the structure has a tapered cross section and can be easily bitten into a slope. Anchor construction method.
  3. 構造体には側方に突出して法面への食い込み量を規制するストッパーが設けられることを特徴とする請求項1又は2記載のグラウンドアンカー工法。   The ground anchor method according to claim 1 or 2, wherein the structure is provided with a stopper that protrudes laterally and regulates the amount of biting into the slope.
  4. 定着体には引張材を通すパイプが取付けられ、コンクリートがパイプ外の型枠内に打設されることを特徴とする請求項1ないし3のいずれかに記載のグラウンドアンカー工法。   The ground anchor method according to any one of claims 1 to 3, wherein a pipe through which a tensile material is passed is attached to the fixing body, and concrete is placed in a formwork outside the pipe.
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CN102182197B (en) * 2011-03-28 2014-10-29 北京鑫实路桥建设有限公司 Bundled grouting anchor rope reinforcing method for road rock slope
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JP6296963B2 (en) * 2014-11-17 2018-03-20 公益財団法人鉄道総合技術研究所 Natural ground reinforcement method and structure

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JPH09177082A (en) * 1995-12-27 1997-07-08 Katsumura Kensetsu Kk Method of stabilizing cut earth inclined surface
JP2005036506A (en) * 2003-07-15 2005-02-10 Hideo Takeuchi Concrete form for constructing pressure plate
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