JP2015001084A - Slope face reinforcement structure and slope face reinforcement method - Google Patents
Slope face reinforcement structure and slope face reinforcement method Download PDFInfo
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- JP2015001084A JP2015001084A JP2013125307A JP2013125307A JP2015001084A JP 2015001084 A JP2015001084 A JP 2015001084A JP 2013125307 A JP2013125307 A JP 2013125307A JP 2013125307 A JP2013125307 A JP 2013125307A JP 2015001084 A JP2015001084 A JP 2015001084A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000002787 reinforcement Effects 0.000 title claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 53
- 239000007924 injection Substances 0.000 claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 47
- 230000003014 reinforcing effect Effects 0.000 claims description 18
- 239000000945 filler Substances 0.000 claims description 15
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 239000000243 solution Substances 0.000 abstract 1
- 230000006866 deterioration Effects 0.000 description 10
- 238000009412 basement excavation Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 238000005553 drilling Methods 0.000 description 5
- 239000011440 grout Substances 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 239000012779 reinforcing material Substances 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000005429 filling process Methods 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
Description
本発明は、切土や盛土によって形成される法面の補強構造及び法面の補強方法に関する。 The present invention relates to a slope reinforcing structure and a slope reinforcing method formed by cutting or embankment.
従来、切土や盛土によって形成される法面の補強方法としては、例えば特許文献１に示すようなものが知られている。こうした法面の補強方法では、まず、中央部に貫通孔を有するプレキャスト板本体を法面に設置した後、貫通孔から法面に削孔して有底の削孔部を形成する。続いて、削孔部に棒状補強材を挿入した後、削孔部内にグラウト材を注入する。この場合、削孔部内にグラウト材を注入した後、削孔部に棒状補強材を挿入するようにしてもよい。 Conventionally, as a method for reinforcing a slope formed by cutting or embankment, for example, the one shown in Patent Document 1 is known. In such a slope reinforcement method, first, a precast plate body having a through hole at the center is installed on the slope, and then a hole with a bottom is formed by drilling from the through hole to the slope. Subsequently, after inserting a rod-shaped reinforcing material into the hole, the grout material is injected into the hole. In this case, a rod-shaped reinforcing material may be inserted into the hole after the grout material is injected into the hole.
続いて、削孔部内に注入したグラウト材を養生して硬化させた後、棒状補強材の突端部に形成されたねじ部に座金をかませた状態でナットを螺嵌して締め付ける。これにより、プレキャスト板本体が法面に固定されて法面が補強される。 Subsequently, after the grout material injected into the drilled hole portion is cured and cured, a nut is screwed and tightened with a washer held on the threaded portion formed at the protruding end portion of the rod-shaped reinforcing material. Thereby, a precast board main body is fixed to a slope and a slope is reinforced.
ところで、上述のように法面を補強する場合、削孔部は、その延設方向が法面に対して直交するように形成されることが多い。しかし、削孔部が法面に対して直交するように形成されている場合には、法面の勾配が急になって垂直に近づくにつれて、削孔部の延設方向は水平に近くなる。そのため、法面の勾配が急になると、削孔部内にグラウト材を充填する際の施工性が悪化してしまうという課題がある。 By the way, when the slope is reinforced as described above, the drilled portion is often formed so that the extending direction thereof is orthogonal to the slope. However, when the drilling portion is formed so as to be orthogonal to the slope, the extending direction of the drilling portion becomes nearly horizontal as the slope of the slope becomes steep and approaches vertical. Therefore, when the slope of the slope becomes steep, there is a problem that workability when filling the grout material in the drilled hole portion is deteriorated.
本発明は、このような従来技術に存在する問題点に着目してなされたものである。その目的とするところは、法面が急勾配であっても、施工性の悪化を抑制することができる法面の補強構造及び法面の補強方法を提供することにある。 The present invention has been made paying attention to such problems existing in the prior art. The purpose is to provide a slope reinforcement structure and a slope reinforcement method that can suppress deterioration in workability even when the slope is steep.
以下、上記課題を解決するための手段及びその作用効果について記載する。
上記課題を解決する法面の補強構造は、法面に配置される板部材と、前記法面に形成された有底の孔に挿入される棒部材と、前記孔に注入される注入材と、前記板部材を前記法面に固定する固定部と、を備え、前記法面の勾配が８０°より大きく、かつ、９０°以下である場合に、前記孔の開口部側から底部側に向かう延設方向と、前記開口部よりも鉛直方向下側の前記法面との交差角度が９０°より小さい。
Hereinafter, means for solving the above-described problems and the effects thereof will be described.
A slope reinforcing structure that solves the above problems includes a plate member disposed on the slope, a rod member that is inserted into a bottomed hole formed in the slope, and an injection material that is injected into the hole. A fixing portion for fixing the plate member to the slope, and when the slope of the slope is greater than 80 ° and 90 ° or less, the opening faces the bottom toward the bottom. An intersection angle between the extending direction and the slope below the opening in the vertical direction is smaller than 90 °.
この構成によれば、法面に形成された孔は、その開口部側から底部側に向かう延設方向と、開口部よりも鉛直方向下側の法面との交差角度が９０°より小さいため、水平に対して下向きに傾斜した状態になる。これにより、孔に注入された注入材は、孔の底部側から溜まっていくので、法面の勾配が８０°より大きく、かつ、９０°以下という急勾配であっても、その法面に形成された孔内に注入材を充填することができる。したがって、法面が急勾配であっても、施工性の悪化を抑制することができる。 According to this configuration, the hole formed in the slope has a crossing angle between the extending direction from the opening to the bottom and the slope below the opening in the vertical direction is smaller than 90 °. In a state inclined downward with respect to the horizontal. As a result, since the injected material injected into the hole accumulates from the bottom side of the hole, even if the slope of the slope is larger than 80 ° and a steep slope of 90 ° or less, it is formed on the slope. The injected hole can be filled with the injection material. Therefore, even if the slope is steep, deterioration of workability can be suppressed.
なお、法面の勾配が９０°のとき、法面は鉛直面となる。すなわち、本明細書において、「法面」とは斜面だけでなく鉛直面も含むものとする。また、本明細書において、「急勾配の法面」とは、水平から上向きの傾斜角度が８０°より大きく、かつ、９０°以下である法面のことをいう。 When the slope of the slope is 90 °, the slope is a vertical plane. That is, in this specification, the “slope” includes not only a slope but also a vertical plane. Further, in this specification, the “steep slope” means a slope having an inclination angle upward from horizontal of 80 ° and 90 ° or less.
上記法面の補強構造は、前記孔内において、前記注入材が充填されない非注入部に充填される充填材を備え、前記法面の勾配が８０°より大きく、かつ、９０°以下である場合に、前記孔の前記延設方向は、水平に対する傾斜角度が１０°以上であるのが好ましい。 The slope reinforcing structure includes a filler filled in a non-injection portion that is not filled with the injection material in the hole, and the slope of the slope is greater than 80 ° and 90 ° or less. Moreover, it is preferable that the extending direction of the hole has an inclination angle with respect to the horizontal of 10 ° or more.
この構成によれば、法面に形成された孔は、開口部側から底部側に向かう延設方向の水平に対する傾斜角度が１０°以上であるので、傾斜角度が１０°より小さい場合よりも孔内における注入材の充填率が高くなる。これに対して、孔内における注入材の充填率が低くなると、孔内において注入材が充填されない非注入部が孔の奥側まで及び、非注入部に充填材を充填する際の施工性が悪化するおそれがある。したがって、延設方向の水平に対する傾斜角度を１０°以上にして、孔内の注入材の充填率を高くすることにより、充填材を充填する際の施工性の悪化を抑制することができる。 According to this configuration, the hole formed in the slope has a tilt angle of 10 ° or more with respect to the horizontal in the extending direction from the opening side toward the bottom side, so that the hole is formed more than in the case where the tilt angle is smaller than 10 °. The filling rate of the injection material in the inside becomes high. On the other hand, when the filling rate of the injection material in the hole is low, the non-injection portion not filled with the injection material in the hole extends to the back side of the hole, and the workability when filling the non-injection portion with the filler is increased. May get worse. Therefore, the deterioration of workability at the time of filling the filler can be suppressed by setting the inclination angle with respect to the horizontal in the extending direction to 10 ° or more and increasing the filling rate of the injection material in the hole.
上記法面の補強構造において、前記孔は前記板部材に設けられた貫通孔を通じて前記法面を掘削することによって形成される削孔であり、前記法面の勾配が８０°より大きく、かつ、９０°以下である場合に、前記孔の前記延設方向は、水平に対する傾斜角度が１５°以下であるのが好ましい。 In the slope reinforcing structure, the hole is a hole formed by excavating the slope through a through hole provided in the plate member, and the slope of the slope is greater than 80 °, and When it is 90 ° or less, it is preferable that the extending direction of the hole has an inclination angle with respect to the horizontal of 15 ° or less.
板部材に設けられた貫通孔を通じて法面を掘削する場合には、孔の延設方向の水平に対する傾斜角度が下向きに大きくなるにつれて、孔を掘削するための掘削部材と板部材の貫通孔とが干渉しやすくなる。その点、上記構成によれば、孔の延設方向は水平に対する傾斜角度が１５°以下であるため、板部材の貫通孔と掘削部材とが干渉しにくくなり、孔を形成する際の施工性の悪化が抑制される。 When excavating a slope through a through hole provided in the plate member, as the inclination angle of the extending direction of the hole with respect to the horizontal increases downward, the excavation member for excavating the hole and the through hole of the plate member Becomes more susceptible to interference. In that respect, according to the above configuration, the extending direction of the hole has an inclination angle of 15 ° or less with respect to the horizontal, so that the through hole of the plate member and the excavating member do not easily interfere with each other, and workability when forming the hole is improved. Deterioration is suppressed.
上記課題を解決する法面の補強方法は、板部材を法面に配置する配置工程と、前記法面に有底の孔を形成する形成工程と、前記孔に棒部材を挿入する挿入工程と、前記孔に注入材を注入する注入工程と、前記板部材を前記法面に固定する固定工程と、を備え、前記法面の勾配が８０°より大きく、かつ、９０°以下である場合に、前記形成工程において、前記孔の開口部側から底部側に向かう延設方向と、前記開口部よりも鉛直方向下側の前記法面との交差角度が９０°より小さくなるように、前記孔を形成する。 A method of reinforcing a slope that solves the above problems includes an arranging step of arranging a plate member on the slope, a forming step of forming a bottomed hole in the slope, and an inserting step of inserting a bar member into the hole. A step of injecting an injection material into the hole and a fixing step of fixing the plate member to the slope, wherein the slope of the slope is greater than 80 ° and 90 ° or less. In the forming step, the hole is formed such that an intersecting angle between an extending direction from the opening side to the bottom side of the hole and the slope below the opening in the vertical direction is smaller than 90 °. Form.
この構成によれば、孔は、開口部側から底部側に向かう延設方向と、開口部よりも鉛直方向下側の法面との交差角度が９０°より小さくなるように形成されるので、水平に対して下向きに傾斜した状態になる。これにより、孔に注入された注入材は、孔の底部側から溜まっていくので、法面の勾配が８０°より大きく、かつ、９０°以下という急勾配であっても、その法面に形成された孔内に注入材を充填することができる。したがって、法面が急勾配であっても、施工性の悪化を抑制することができる。 According to this configuration, the hole is formed such that the crossing angle between the extending direction from the opening side to the bottom side and the slope below the opening in the vertical direction is smaller than 90 °. It is in a state of being inclined downward with respect to the horizontal. As a result, since the injected material injected into the hole accumulates from the bottom side of the hole, even if the slope of the slope is larger than 80 ° and a steep slope of 90 ° or less, it is formed on the slope. The injected hole can be filled with the injection material. Therefore, even if the slope is steep, deterioration of workability can be suppressed.
以下、法面の補強構造及び法面の補強方法の一実施形態を図面に従って説明する。
初めに、法面の補強構造について説明する。
図１に示すように、地山（地盤）１１に形成された斜面である法面１２には、コンクリートのプレキャスト板によって構成された平面視矩形状の板部材１３が固定されている。なお、本実施形態の法面１２の勾配θｓは８５°であるが、本実施形態の法面の補強構造及び補強方法は、勾配θｓが８０°より大きく、かつ、９０°以下の法面に適応することができる。
Hereinafter, an embodiment of a slope reinforcing structure and a slope reinforcing method will be described with reference to the drawings.
First, the slope reinforcing structure will be described.
As shown in FIG. 1, a plate member 13 having a rectangular shape in a plan view formed of a concrete precast plate is fixed to a slope 12 which is a slope formed on a natural ground (ground) 11. The slope θs of the slope 12 of the present embodiment is 85 °, but the slope reinforcement structure and method of the present embodiment are such that the slope θs is greater than 80 ° and 90 ° or less. Can adapt.
板部材１３における地山１１とは反対側の面である表面の中央部には、平面視略正方形状をなす凹部１４が形成されている。凹部１４において、内底面の中央部には、板部材１３を貫通する平面視円形の貫通孔１５が、板部材１３の表面に対して直交するように形成されている。板部材１３には、貫通孔１５における凹部１４側の端部を囲む金属製の定着プレート１６が埋設されている。定着プレート１６は、平面視において正方形状をなしており、その中心部に中心孔１６ａを有している。 A concave portion 14 having a substantially square shape in plan view is formed at the center of the surface of the plate member 13 on the opposite side of the ground 11. In the concave portion 14, a through hole 15 having a circular shape in plan view that penetrates the plate member 13 is formed at a central portion of the inner bottom surface so as to be orthogonal to the surface of the plate member 13. A metal fixing plate 16 is embedded in the plate member 13 so as to surround an end portion of the through hole 15 on the concave portion 14 side. The fixing plate 16 has a square shape in plan view, and has a center hole 16a at the center thereof.
法面１２における貫通孔１５と対応する位置には、貫通孔１５よりも若干径の小さい有底の孔１７が形成されている。なお、本実施形態の孔１７は、法面１２に形成される開口部１７ａ側から底部１７ｂ側に向かう延設方向が水平に対して下向きに傾斜しており、その勾配θｂは１０°になっている。また、孔１７の延設方向と、開口部１７ａよりも鉛直方向下側の法面１２との交差角度θｃは９０°より小さい８５°になっている。 A bottomed hole 17 having a slightly smaller diameter than the through hole 15 is formed at a position corresponding to the through hole 15 on the slope 12. In the hole 17 of the present embodiment, the extending direction from the opening 17a side to the bottom 17b side formed in the slope 12 is inclined downward with respect to the horizontal, and the gradient θb is 10 °. ing. Further, the crossing angle θc between the extending direction of the hole 17 and the slope 12 below the opening 17a in the vertical direction is 85 ° which is smaller than 90 °.
孔１７には、異形棒鋼よりなる棒部材１８が貫通孔１５を通して挿通されている。棒部材１８は、その一端が孔１７の底部１７ｂ近傍に位置するとともに、他端が凹部１４内に位置している。棒部材１８における孔１７外に位置する突端部には、ねじ部２０が設けられている。 A rod member 18 made of a deformed steel bar is inserted into the hole 17 through the through hole 15. One end of the rod member 18 is located in the vicinity of the bottom 17 b of the hole 17, and the other end is located in the recess 14. A threaded portion 20 is provided at a protruding end portion of the bar member 18 located outside the hole 17.
棒部材１８における孔１７内に位置する部分には、棒部材１８を孔１７の中心位置に保持するためのフレーム状のスペーサ２１が棒部材１８の長手方向に沿って等間隔で複数取着されている。 A plurality of frame-like spacers 21 for holding the rod member 18 at the center position of the hole 17 are attached to the portion of the rod member 18 located in the hole 17 at equal intervals along the longitudinal direction of the rod member 18. ing.
貫通孔１５には、基端に貫通孔１５よりも外径の大きいフランジ部２２を有する円筒状のガイド部材２３が挿嵌されている。ガイド部材２３は、例えば樹脂によって形成され、先端に向かうほど径が徐々に小さくなっている。そして、ガイド部材２３は、その先端部が孔１７の入口側の端部に挿嵌されるとともに、基端に位置するフランジ部２２が凹部１４の内底面に当接している。 A cylindrical guide member 23 having a flange portion 22 having an outer diameter larger than that of the through hole 15 is inserted into the through hole 15 at the base end. The guide member 23 is made of resin, for example, and the diameter gradually decreases toward the tip. The leading end of the guide member 23 is inserted into the end portion on the inlet side of the hole 17, and the flange portion 22 located at the base end is in contact with the inner bottom surface of the recess 14.
孔１７内及びガイド部材２３内には、早強ポルトランドセメントを使用したセメントミルクによって構成された注入材２４が充填された状態で硬化している。孔１７内における開口部１７ａ付近の一部及びガイド部材２３内のほぼ上側半分には、硬練りモルタルよりなる充填材２５が充填された状態で硬化している。 The hole 17 and the guide member 23 are hardened while being filled with an injection material 24 made of cement milk using early strong Portland cement. A portion near the opening 17a in the hole 17 and a substantially upper half in the guide member 23 are hardened while being filled with a filler 25 made of hard mortar.
凹部１４内において、棒部材１８のねじ部２０には、平面視正方形状をなす平座金２６と、傾斜座金３５とがかませられた状態でナット２７が螺嵌されて締め付けられている。本実施形態において、ねじ部２０に螺嵌されるナット２７と、平座金２６と、傾斜座金３５とは、板部材１３を法面１２に固定する固定部５０を構成する。 In the recess 14, a nut 27 is screwed and tightened to the threaded portion 20 of the bar member 18 with a plain washer 26 having a square shape in plan view and an inclined washer 35 interposed therebetween. In the present embodiment, the nut 27, the flat washer 26, and the inclined washer 35 that are screwed into the screw part 20 constitute a fixing part 50 that fixes the plate member 13 to the slope 12.
傾斜座金３５において、平座金２６側に配置される傾斜面（図１では左面）は、ナット２７側に配置される面（図１では右面）に対して、交差角度θｃに対応する傾斜角度θｔ（例えば、θｔ＝９０°−θｃ。本実施形態ではθｔ＝５°。）で配置されている。 In the inclined washer 35, the inclined surface (left surface in FIG. 1) disposed on the flat washer 26 side is inclined with respect to the surface (right surface in FIG. 1) disposed on the nut 27 side, corresponding to the intersecting angle θc. (For example, θt = 90 ° −θc. In this embodiment, θt = 5 °).
平座金２６の一辺の長さは、貫通孔１５の直径よりも長く且つガイド部材２３のフランジ部２２の外径よりも短くなっている。そして、板部材１３と法面１２との間には、セメントベントナイトよりなる裏込材２８が充填された状態で硬化している。また、凹部１４内には、平面視において略正方形状をなす板状のカバー部材２９が配置されている。 The length of one side of the flat washer 26 is longer than the diameter of the through hole 15 and shorter than the outer diameter of the flange portion 22 of the guide member 23. And between the board member 13 and the slope 12, it has hardened | cured in the state with which the backing material 28 which consists of cement bentonite was filled. A plate-like cover member 29 having a substantially square shape in plan view is disposed in the recess 14.
カバー部材２９の内側の面には固定部５０を収容する収容凹部３０が形成されている。そして、収容凹部３０内、及びカバー部材２９と凹部１４との間の隙間には、モルタルよりなる充填材３１が充填された状態で硬化している。 A housing recess 30 for housing the fixed portion 50 is formed on the inner surface of the cover member 29. And the inside of the accommodation recessed part 30 and the clearance gap between the cover member 29 and the recessed part 14 are hardened | cured in the state with which the filler 31 which consists of mortar was filled.
次に、上述した法面１２の補強方法について説明する。
図２に示すように、法面１２の補強を行う場合には、まず配置工程として、板部材１３を法面１２に配置する。すなわち、板部材１３を、法面１２との間に隙間が形成されるように隙間形成部材３２を介在させた状態で、法面１２と平行に配置する。続いて、板部材１３と法面１２との隙間に裏込材２８を充填する。
Next, the reinforcement method of the slope 12 mentioned above is demonstrated.
As shown in FIG. 2, when reinforcing the slope 12, first, the plate member 13 is placed on the slope 12 as the placement step. That is, the plate member 13 is disposed in parallel with the slope 12 with the gap forming member 32 interposed so that a gap is formed between the plate 13 and the slope 12. Subsequently, the backing material 28 is filled in the gap between the plate member 13 and the slope 12.
次に、形成工程として、掘削部材３９を用いて法面１２を掘削して、削孔である孔１７を形成する。掘削部材３９は、円筒状のケーシング４０と、ケーシング４０の内側に配置された削孔管４１と、削孔管４１の先端に設けられた掘削部４２とを含んでいる。 Next, as a forming step, the slope 12 is excavated using the excavating member 39 to form the hole 17 that is a drilling hole. The excavation member 39 includes a cylindrical casing 40, a drilled tube 41 disposed inside the casing 40, and a drilled portion 42 provided at the tip of the drilled tube 41.
形成工程においては、まず、ケーシング４０に削孔管４１及び掘削部４２を内蔵した状態の掘削部材３９を板部材１３の貫通孔１５に通して、貫通孔１５よりも鉛直方向下側の法面１２に対する交差角度θｃが８５°になるように、掘削部４２で地山１１を掘削しながらケーシング４０を挿入していく。そして、掘削部４２によって孔１７が形成されるとともに、形成された孔１７内にケーシング４０が挿入されると、ケーシング４０を孔１７内に残して、削孔管４１及び掘削部４２を引き抜く。 In the forming step, first, the excavation member 39 in which the drilling pipe 41 and the excavation part 42 are built in the casing 40 is passed through the through hole 15 of the plate member 13, and the slope below the through hole 15 in the vertical direction. The casing 40 is inserted while the excavation part 42 excavates the natural ground 11 so that the crossing angle θc with respect to 12 is 85 °. Then, the hole 17 is formed by the excavation part 42, and when the casing 40 is inserted into the formed hole 17, the hole 40 and the excavation part 42 are pulled out while leaving the casing 40 in the hole 17.
また、図３に示すように、注入工程として、ケーシング４０の内側に差し込んだホース４３を通じて、孔１７に注入材２４であるセメントミルクを注入する。注入工程においては、ホース４３を孔１７の底部１７ｂ付近まで差し込み、底部１７ｂ側から注入材２４が充填されるようにする。そして、開口部１７ａから注入材２４が溢れ出るまで、注入材２４の注入を継続する。 Moreover, as shown in FIG. 3, as an injection | pouring process, the cement milk which is the injection material 24 is inject | poured into the hole 17 through the hose 43 inserted inside the casing 40. As shown in FIG. In the injection step, the hose 43 is inserted to the vicinity of the bottom 17b of the hole 17 so that the injection material 24 is filled from the bottom 17b side. The injection of the injection material 24 is continued until the injection material 24 overflows from the opening 17a.
続いて、図４に示すように、挿入工程として、スペーサ２１が所定の間隔で複数取り着けられた棒部材１８を孔１７内に挿入する。このとき、棒部材１８は、スペーサ２１によって孔１７の中心位置に配置された状態で、孔１７内に設置される。 Subsequently, as shown in FIG. 4, as an insertion step, the rod members 18 having a plurality of spacers 21 attached at predetermined intervals are inserted into the holes 17. At this time, the rod member 18 is installed in the hole 17 in a state where the bar member 18 is arranged at the center position of the hole 17 by the spacer 21.
孔１７内に棒部材１８を挿入した後、ケーシング４０（図３参照）を孔１７から引き抜く。また、ガイド部材２３を貫通孔１５に差し込む。すると、貫通孔１５と孔１７とがガイド部材２３を介して連通する。続いて、ガイド部材２３を介して孔１７に注入材２４を補足注入する。そして、１日養生して注入材２４及び裏込材２８を硬化させる。 After the rod member 18 is inserted into the hole 17, the casing 40 (see FIG. 3) is pulled out from the hole 17. Further, the guide member 23 is inserted into the through hole 15. Then, the through hole 15 and the hole 17 communicate with each other through the guide member 23. Subsequently, the injection material 24 is supplementally injected into the hole 17 through the guide member 23. Then, curing is performed for one day to cure the injection material 24 and the backing material 28.
ここで、孔１７は水平に対して下向きに傾斜して延びているため、孔１７内における開口部１７ａ付近の一部及びガイド部材２３内のほぼ上側半分には、注入材２４が充填されない空洞である非注入部３３が形成される。 Here, since the holes 17 are inclined downward with respect to the horizontal, a part of the hole 17 near the opening 17a and a substantially upper half of the guide member 23 are not filled with the injection material 24. A non-injection portion 33 is formed.
図１に示すように、注入材２４及び裏込材２８の硬化後には、充填工程として非注入部３３に充填材２５を充填する。なお、充填材２５として用いられる硬練りモルタルは、施工時における流動性が注入材２４よりも低い。 As shown in FIG. 1, after the injection material 24 and the backing material 28 are cured, the non-injection portion 33 is filled with the filling material 25 as a filling step. The kneaded mortar used as the filler 25 has a lower fluidity than the injecting material 24 during construction.
続いて、固定工程として、棒部材１８のねじ部２０に平座金２６及び傾斜座金３５をかませた状態でナット２７を螺嵌して締め付けることで、板部材１３を法面１２に押し付けて固定する。このとき、棒部材１８は板部材１３及び定着プレート１６に対して傾いているため、定着プレート１６とナット２７との間に傾斜座金３５が介在させる。 Subsequently, as a fixing step, the plate member 13 is pressed against the slope 12 and fixed by screwing and tightening the nut 27 in a state where the flat washer 26 and the inclined washer 35 are engaged with the threaded portion 20 of the bar member 18. To do. At this time, since the bar member 18 is inclined with respect to the plate member 13 and the fixing plate 16, an inclined washer 35 is interposed between the fixing plate 16 and the nut 27.
そして、固定工程により、平座金２６によって貫通孔１５がガイド部材２３越しに塞がれる。すなわち、平座金２６によってガイド部材２３におけるフランジ部２２側の開口が塞がれる。 Then, the through hole 15 is blocked over the guide member 23 by the flat washer 26 by the fixing process. In other words, the opening on the flange portion 22 side of the guide member 23 is closed by the flat washer 26.
さらに、覆蓋工程として、収容凹部３０に充填材３１を充填するとともに内側の面に充填材３１を塗布したカバー部材２９を凹部１４内に収容する。このとき、棒部材１８の突端及び固定部５０は、カバー部材２９の収容凹部３０内に充填された充填材３１にめり込んだ状態となる。その後、充填材３１が硬化することで、法面１２の補強が完了する。 Further, as a cover step, the cover member 29 in which the accommodating recess 30 is filled with the filler 31 and the filler 31 is applied to the inner surface is accommodated in the recess 14. At this time, the protruding end of the rod member 18 and the fixing portion 50 are in a state of being embedded in the filler 31 filled in the housing recess 30 of the cover member 29. Thereafter, the filler 31 is cured, and the reinforcement of the slope 12 is completed.
次に、本実施形態にかかる法面の補強構造及び法面の補強方法の作用について説明する。
図１に示すように、本実施形態の孔１７は、法面１２との交差角度θｃが８５°になるように形成される。その結果、孔１７の延設方向は、水平に対して下向きに傾斜した状態になる。そのため、注入工程において、孔１７に注入された注入材２４は、底部１７ｂ側から充填される。
Next, the operation of the slope reinforcing structure and the slope reinforcing method according to this embodiment will be described.
As shown in FIG. 1, the hole 17 of the present embodiment is formed so that the crossing angle θc with the slope 12 is 85 °. As a result, the extending direction of the hole 17 is inclined downward with respect to the horizontal. Therefore, in the injection step, the injection material 24 injected into the hole 17 is filled from the bottom 17b side.
なお、注入工程において、孔１７内における注入材２４の充填率が低い場合には、非注入部３３が孔１７の奥深くまで形成されるために、充填工程において充填材２５を充填する作業の手間が増える。その点、孔１７の勾配θｂを本実施形態のように１０°以上にすることによって、充填工程における作業の手間が過度に増えない程度に、注入材２４が充填される。 In the injection process, when the filling rate of the injection material 24 in the hole 17 is low, the non-injection part 33 is formed deep in the hole 17, and therefore, the work of filling the filler 25 in the filling process is troublesome. Will increase. In that respect, by setting the gradient θb of the hole 17 to 10 ° or more as in the present embodiment, the injection material 24 is filled to such an extent that the labor of the filling process does not increase excessively.
ここで、例えば法面１２の勾配θｓが８５°よりも緩い８０°である場合には、延設方向と法面１２との交差角度θｃを９０°としても、孔１７の勾配θｂが１０°になる。これに対して、法面１２の勾配θｓが８０°より大きい場合には、延設方向と法面１２との交差角度θｃを９０°にすると、孔１７の勾配θｂが１０°より小さくなる。 Here, for example, when the slope θs of the slope 12 is 80 °, which is looser than 85 °, the slope θb of the hole 17 is 10 ° even if the intersection angle θc between the extending direction and the slope 12 is 90 °. become. On the other hand, when the slope θs of the slope 12 is larger than 80 °, the slope θb of the hole 17 becomes smaller than 10 ° when the intersection angle θc between the extending direction and the slope 12 is 90 °.
そのため、法面１２の勾配θｓが８０°より大きいような急勾配である場合には、延設方向と法面１２との交差角度θｃを９０°より小さくすることによって、施工性の悪化が抑制される。 Therefore, when the slope θs of the slope 12 is steep so as to be larger than 80 °, the deterioration of the workability is suppressed by making the intersection angle θc between the extending direction and the slope 12 smaller than 90 °. Is done.
一方で、孔１７の勾配θｂが１５°より大きくなると、孔１７を形成する際に、板部材１３の貫通孔１５と掘削部材３９とが干渉しやすくなる。なお、法面１２に孔１７を形成した後に板部材１３を配置することも考えられるが、この場合には板部材１３の貫通孔１５と法面１２に形成した孔１７との位置を合わせる作業が必要になる。 On the other hand, when the gradient θb of the hole 17 is greater than 15 °, the through hole 15 of the plate member 13 and the excavating member 39 are likely to interfere with each other when the hole 17 is formed. It is also possible to arrange the plate member 13 after forming the holes 17 on the slope 12, but in this case, the operation of aligning the positions of the through holes 15 of the plate member 13 and the holes 17 formed on the slope 12. Is required.
また、板部材１３の貫通孔１５の直径を大きくすることによって、孔１７の勾配θｂを１５°より大きくしつつ、貫通孔１５と掘削部材３９との干渉を回避することも考えられる。ただし、法面１２に対する補強効果という点では、貫通孔１５は小さい方が好ましい。したがって、本実施形態のように孔１７の勾配θｂを１５°以下にすれば、作業効率の面でも好ましい上に、板部材１３による高い補強効果が得られる。 It is also conceivable to avoid interference between the through hole 15 and the excavation member 39 while increasing the gradient θb of the hole 17 by more than 15 ° by increasing the diameter of the through hole 15 of the plate member 13. However, in terms of the reinforcing effect on the slope 12, it is preferable that the through hole 15 is small. Therefore, if the gradient θb of the holes 17 is set to 15 ° or less as in the present embodiment, it is preferable in terms of work efficiency and a high reinforcing effect by the plate member 13 can be obtained.
以上のことから、法面１２の勾配θｓが８０°より大きく、かつ、９０°以下である場合には、孔１７の勾配θｂは、水平より下向きであって、１０°≦θｂ≦１５°にするのが好ましい。 From the above, when the slope θs of the slope 12 is greater than 80 ° and 90 ° or less, the slope θb of the hole 17 is downward from the horizontal and 10 ° ≦ θb ≦ 15 °. It is preferable to do this.
以上詳述した実施形態によれば次のような効果が発揮される。
（１）法面１２に形成された孔１７は、その開口部１７ａ側から底部１７ｂ側に向かう延設方向と、開口部１７ａよりも鉛直方向下側の法面１２との交差角度θｃが９０°より小さいため、水平に対して下向きに傾斜した状態になる。これにより、孔１７に注入された注入材２４は、孔１７の底部１７ｂ側から溜まっていくので、法面１２の勾配が８０°より大きく、かつ、９０°以下という急勾配であっても、その法面１２に形成された孔１７内に注入材２４を充填することができる。したがって、法面１２が急勾配であっても、施工性の悪化を抑制することができる。
According to the embodiment detailed above, the following effects are exhibited.
(1) The hole 17 formed in the slope 12 has an intersection angle θc of 90 between the extending direction from the opening 17a side to the bottom 17b side and the slope 12 below the opening 17a in the vertical direction. Since it is smaller than °, it is inclined downward with respect to the horizontal. Thereby, since the injection material 24 injected into the hole 17 accumulates from the bottom 17b side of the hole 17, even if the slope of the slope 12 is larger than 80 ° and a steep slope of 90 ° or less, The injection material 24 can be filled into the holes 17 formed in the slope 12. Therefore, even if the slope 12 is steep, deterioration of workability can be suppressed.
（２）法面１２に形成された孔１７は、開口部１７ａ側から底部１７ｂ側に向かう延設方向の水平に対する傾斜角度θｂが１０°以上であるので、傾斜角度θｂが１０°より小さい場合よりも孔１７内における注入材２４の充填率が高くなる。これに対して、孔１７内における注入材２４の充填率が低くなると、孔１７内において注入材２４が充填されない非注入部３３が孔１７の奥側まで及び、非注入部３３に充填材２５を充填する際の施工性が悪化するおそれがある。したがって、延設方向の水平に対する傾斜角度θｂを１０°以上にして、孔１７内の注入材２４の充填率を高くすることにより、充填材２５を充填する際の施工性の悪化を抑制することができる。 (2) Since the hole 17 formed in the slope 12 has an inclination angle θb with respect to the horizontal in the extending direction from the opening 17a side toward the bottom portion 17b side is 10 ° or more, the inclination angle θb is smaller than 10 ° The filling rate of the injection material 24 in the hole 17 becomes higher than that. On the other hand, when the filling rate of the injection material 24 in the hole 17 becomes low, the non-injection portion 33 that is not filled with the injection material 24 extends to the far side of the hole 17 and fills the non-injection portion 33 with the filler 25. There is a possibility that the workability at the time of filling is deteriorated. Therefore, the inclination angle θb with respect to the horizontal in the extending direction is set to 10 ° or more, and the filling rate of the injection material 24 in the hole 17 is increased, thereby suppressing deterioration in workability when filling the filler 25. Can do.
（３）板部材１３に設けられた貫通孔１５を通じて法面１２を掘削する場合には、孔１７の延設方向の水平に対する傾斜角度θｂが下向きに大きくなるにつれて、孔１７を掘削するための掘削部材３９と板部材１３の貫通孔１５とが干渉しやすくなる。その点、上記実施形態によれば、孔１７の延設方向は水平に対する傾斜角度θｂが１５°以下であるため、板部材１３の貫通孔１５と掘削部材３９とが干渉しにくくなり、孔１７を形成する際の施工性の悪化が抑制される。 (3) When the slope 12 is excavated through the through-hole 15 provided in the plate member 13, the hole 17 is excavated as the inclination angle θb with respect to the horizontal in the extending direction of the hole 17 increases downward. The excavation member 39 and the through hole 15 of the plate member 13 easily interfere with each other. In that respect, according to the above-described embodiment, the extending direction of the hole 17 is such that the inclination angle θb with respect to the horizontal is 15 ° or less, so that the through hole 15 of the plate member 13 and the excavating member 39 are less likely to interfere with each other. The deterioration of the workability when forming the film is suppressed.
（変更例）
なお、上記実施形態は、次のように変更して具体化することも可能である。また、下記変更例は、任意に組み合わせることができる。
(Example of change)
In addition, the said embodiment can also be changed and actualized as follows. Moreover, the following modified examples can be arbitrarily combined.
・図５に示すように、法面１２の勾配θｓが９０°である場合に、孔１７の勾配θｂを１５°にするとともに、交差角度θｃを７５°としてもよい。この場合にも、上述した実施形態と同様の作用及び効果を得ることができる。 As shown in FIG. 5, when the slope θs of the slope 12 is 90 °, the slope θb of the hole 17 may be 15 ° and the crossing angle θc may be 75 °. Also in this case, the same operation and effect as the above-described embodiment can be obtained.
・傾斜座金３５における傾斜角度θｔは、必ずしもθｔ＝９０°−θｃを満たす値でなくてもよく、棒部材１８の板部材１３に対する傾きを抑制することができればよい。また、棒部材１８の板部材１３に対する傾きが小さい場合などには、傾斜座金３５を用いなくてもよい。 The inclination angle θt in the inclined washer 35 is not necessarily a value satisfying θt = 90 ° −θc, as long as the inclination of the bar member 18 with respect to the plate member 13 can be suppressed. Further, when the inclination of the bar member 18 with respect to the plate member 13 is small, the inclined washer 35 need not be used.
・孔１７の勾配θｂは、１０°より小さくてもよい。この場合には、例えば注入工程において孔１７の開口部１７ａの下側を覆う蓋部材を設け、この蓋部材で開口部１７ａからの注入材２４の流出を抑制することによって、注入材２４の充填を行うようにすることもできる。 -The gradient θb of the holes 17 may be smaller than 10 °. In this case, for example, a lid member that covers the lower side of the opening 17a of the hole 17 is provided in the injection step, and the injection member 24 is filled by suppressing the outflow of the injection material 24 from the opening 17a with this lid member. It is also possible to perform.
・孔１７の勾配θｂは、１５°より大きくてもよい。この場合には、孔１７の勾配θｂが１５°以下の場合よりも、孔１７に対する注入材２４の充填率をより大きくすることができる。 The gradient θb of the holes 17 may be greater than 15 °. In this case, the filling rate of the injection material 24 into the holes 17 can be made larger than when the gradient θb of the holes 17 is 15 ° or less.
さらに、上記実施形態及び各変形例から把握される技術的思想を以下に記載する。
（イ）前記固定部は、前記棒部材における前記孔外に位置する突端部に形成されたねじ部に螺嵌されるナットと、傾斜座金とを含み、
前記傾斜座金は、前記開口部よりも鉛直方向下側の前記法面と前記延設方向との交差角度に対応する傾斜角度の傾斜面を有することを特徴とする請求項１〜請求項３のうちいずれか一項に記載の法面の補強構造。
Furthermore, the technical idea grasped | ascertained from the said embodiment and each modification is described below.
(A) The fixing portion includes a nut screwed into a screw portion formed at a protruding end portion located outside the hole in the rod member, and an inclined washer.
The said inclined washer has an inclined surface of the inclination angle corresponding to the crossing angle of the said slope and the said extending direction below a perpendicular direction rather than the said opening part, The Claim 1-Claim 3 characterized by the above-mentioned. The slope reinforcement structure as described in any one of them.
孔に挿入される棒部材は孔の延設方向に沿って設置されるため、孔の延設方向と法面とが直交しないと、ナットを締め付けたときにナットの下端側が浮いてしまう。そして、ナットが浮かないように締め付ける力を強くすると棒部材に曲げ引張り力やせん断力が作用してしまう一方で、棒部材に不要な曲げ引張り力やせん断力が作用しないように注意しながらナットの締め付け作業を行うと、施工性が悪化してしまう。その点、上記構成によれば、座金は傾斜面を有するので、ナットを締め付けたときのナットの浮きが抑制される。したがって、ナットの締め付けによって板部材を固定する際の施工性の悪化を抑制することができる。 Since the rod member inserted into the hole is installed along the extending direction of the hole, the lower end side of the nut will float when the nut is tightened unless the extending direction of the hole is perpendicular to the slope. If the tightening force is tightened so that the nut does not float, bending tension and shearing force will be applied to the rod member, while taking care not to apply unnecessary bending tensile force and shearing force to the rod member. When the tightening operation is performed, the workability deteriorates. In that respect, according to the above configuration, the washer has an inclined surface, so that the nut is prevented from floating when the nut is tightened. Therefore, it is possible to suppress deterioration in workability when the plate member is fixed by tightening the nut.
１２…法面、１３…板部材、１５…貫通孔、１７…孔、１７ａ…開口部、１７ｂ…底部、１８…棒部材、２４…注入材、２５…充填材、３３…非注入部、５０…固定部。 DESCRIPTION OF SYMBOLS 12 ... Slope, 13 ... Plate member, 15 ... Through-hole, 17 ... Hole, 17a ... Opening part, 17b ... Bottom part, 18 ... Bar member, 24 ... Injection material, 25 ... Filler, 33 ... Non-injection part, 50 …Fixed part.
Claims (4)
前記法面に形成された有底の孔に挿入される棒部材と、
前記孔に注入される注入材と、
前記板部材を前記法面に固定する固定部と、
を備え、
前記法面の勾配が８０°より大きく、かつ、９０°以下である場合に、
前記孔の開口部側から底部側に向かう延設方向と、前記開口部よりも鉛直方向下側の前記法面との交差角度が９０°より小さいことを特徴とする法面の補強構造。 A plate member arranged on the slope,
A rod member inserted into a bottomed hole formed in the slope,
An injection material to be injected into the hole;
A fixing portion for fixing the plate member to the slope;
With
When the slope of the slope is greater than 80 ° and 90 ° or less,
A slope reinforcement structure, wherein an intersection angle between an extending direction from the opening side of the hole toward the bottom side and the slope below the opening in a vertical direction is smaller than 90 °.
前記法面の勾配が８０°より大きく、かつ、９０°以下である場合に、
前記孔の前記延設方向は、水平に対する傾斜角度が１０°以上であることを特徴とする請求項１に記載の法面の補強構造。 In the hole, comprising a filler that fills a non-injection portion that is not filled with the injection material,
When the slope of the slope is greater than 80 ° and 90 ° or less,
2. The slope reinforcing structure according to claim 1, wherein the extending direction of the hole has an inclination angle with respect to the horizontal of 10 ° or more.
前記法面の勾配が８０°より大きく、かつ、９０°以下である場合に、
前記孔の前記延設方向は、水平に対する傾斜角度が１５°以下であることを特徴とする請求項１または請求項２に記載の法面の補強構造。 The hole is a hole formed by excavating the slope through a through hole provided in the plate member;
When the slope of the slope is greater than 80 ° and 90 ° or less,
The slope reinforcing structure according to claim 1 or 2, wherein the extending direction of the hole has an inclination angle with respect to the horizontal of 15 ° or less.
前記法面に有底の孔を形成する形成工程と、
前記孔に棒部材を挿入する挿入工程と、
前記孔に注入材を注入する注入工程と、
前記板部材を前記法面に固定する固定工程と、
を備え、
前記法面の勾配が８０°より大きく、かつ、９０°以下である場合に、
前記形成工程において、前記孔の前記法面に形成される開口部側から底部側に向かう延設方向と、前記開口部よりも鉛直方向下側の前記法面との交差角度が９０°より小さくなるように、前記孔を形成することを特徴とする法面の補強方法。 An arrangement step of arranging the plate member on the slope,
Forming a bottomed hole on the slope;
An insertion step of inserting a rod member into the hole;
An injection step of injecting an injection material into the hole;
A fixing step of fixing the plate member to the slope;
With
When the slope of the slope is greater than 80 ° and 90 ° or less,
In the forming step, an intersecting angle between an extending direction from the opening side formed on the slope surface of the hole toward the bottom side and the slope surface below the opening in a vertical direction is smaller than 90 °. The method for reinforcing a slope is characterized by forming the hole.
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