JP5500431B2 - Basic steel pipe settlement prevention structure - Google Patents
Basic steel pipe settlement prevention structure Download PDFInfo
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- JP5500431B2 JP5500431B2 JP2010027189A JP2010027189A JP5500431B2 JP 5500431 B2 JP5500431 B2 JP 5500431B2 JP 2010027189 A JP2010027189 A JP 2010027189A JP 2010027189 A JP2010027189 A JP 2010027189A JP 5500431 B2 JP5500431 B2 JP 5500431B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 119
- 239000010959 steel Substances 0.000 title claims description 119
- 230000002265 prevention Effects 0.000 title claims description 84
- 230000003014 reinforcing effect Effects 0.000 claims description 19
- 230000002787 reinforcement Effects 0.000 claims description 7
- 210000000078 claw Anatomy 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 6
- 238000005304 joining Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 description 10
- 238000009434 installation Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000009933 burial Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Description
本発明は、地盤に埋設した基礎鋼管に電柱等の柱体の下部を挿入して固定する際、地盤が軟弱地質であっても、基礎鋼管の沈下を防止し得る基礎鋼管沈下防止構造に関する。 The present invention relates to a foundation steel pipe settlement prevention structure capable of preventing settlement of a foundation steel pipe even when the ground is soft geology when a lower part of a pole body such as a power pole is inserted and fixed to the foundation steel pipe buried in the ground.
従来から、基礎鋼管を所定の地盤に埋設し、この基礎鋼管の内部に電柱や街路灯又は信号灯等の柱体を挿入して固定することにより、これらの柱体を建柱することが行われている。この際、基礎鋼管を地盤へ埋設するには、アースオーガを用いた基礎鋼管を回転圧入して埋設し、上記の柱体を挿入して生コンクリート等の固化剤を投入することにより、基礎鋼管と柱体とを一体的に結合する。 Conventionally, foundation steel pipes have been buried in a predetermined ground, and these pillar bodies have been built by inserting and fixing pillars such as electric poles, street lights or signal lights inside the foundation steel pipe. ing. At this time, in order to embed the foundation steel pipe in the ground, the foundation steel pipe using an earth auger is rotationally press-fitted, and the above-mentioned pillar body is inserted and a solidifying agent such as ready-mixed concrete is introduced, thereby introducing the foundation steel pipe. And the column are joined together.
ところで、このような基礎鋼管を軟弱地盤に埋設する際、地盤支持力が小さいため、柱体の沈下や傾斜が生じる。従って、基礎鋼管を軟弱地盤に埋設する際には、特に基礎鋼管の沈下を防止することが重要となる。 By the way, when embedding such a basic steel pipe in soft ground, the ground supporting force is small, so that the column body sinks or tilts. Therefore, when embedding the foundation steel pipe in the soft ground, it is particularly important to prevent the settlement of the foundation steel pipe.
ここで、電柱等の柱体の沈下防止手段として従来の技術を参照する。特許文献1の発明は、「軟弱地盤用の回転圧入杭」と称するものである。その構成は、杭本体の下端に外向きフランジを設け、このフランジの外周の複数個所に地盤掘削用の爪を設けると共に、杭本体の左右外側に杭の回転方向へ向かう下り勾配を有する沈下防止用羽根を段違いに複数対設けたものである。 Here, a conventional technique is referred to as a means for preventing settlement of a pole body such as a utility pole. The invention of Patent Document 1 is referred to as “rotary press-fitting pile for soft ground”. Its configuration is to provide an outward flange at the lower end of the pile body, and to provide ground excavation nails at multiple locations on the outer periphery of this flange, and to prevent settlement that has a downward slope toward the rotation direction of the pile on the left and right outside of the pile body A plurality of pairs of blades are provided at different levels.
このような構成において、杭本体の下端に設けられたフランジは抵抗体の先端にあって、杭本体を地盤へ回転圧入する際の土圧をフランジ面で受けるため、杭本体を地盤中に進入する際に大きな回転力が必要となる。また、設計地盤支持力を得るためには予め杭先端位置の地盤強さの把握が必要となるが、電柱や街路灯のように同一地盤内での設置が限られる場合、杭先端部の地盤調査はコストも含め適用が困難である。さらに、杭本体の外周に沈下防止用羽根が設けられているため、地盤中に螺旋状に回転挿入できないと、逆に基礎周囲の地盤を緩める結果となり、柱体が傾斜しやすい基礎となる。 In such a configuration, the flange provided at the lower end of the pile body is at the tip of the resistor and receives the earth pressure when the pile body is rotationally pressed into the ground at the flange surface, so the pile body enters the ground. When doing so, a large rotational force is required. In addition, in order to obtain the design ground support force, it is necessary to grasp the ground strength at the tip of the pile in advance, but when installation in the same ground is limited, such as utility poles and street lights, the ground at the tip of the pile is limited. The survey is difficult to apply including the cost. Furthermore, since the subsidence prevention blades are provided on the outer periphery of the pile body, if the rotation cannot be spirally inserted into the ground, the ground around the foundation is loosened, and the column body is easily inclined.
これに対して、特許文献2の発明「電柱の沈下防止方法及びその装置」は、抵抗板と収納筒を係合させた構造を有し、地盤に埋設した電柱の地際部地面に収納筒と電柱とを楔を介して一体結合したものである。また、その具体的構造として、抵抗板は長方形鋼板であって電柱の埋設後に地際部地面に設けられるため、抵抗板が電柱を埋設する際の妨げにはならない。しかも、特許文献2の抵抗板は、特許文献1と比較すると、地盤支持力を得る深さが浅いことから、予め抵抗板設置面の地盤強さを測定することが容易となり、沈下防止効果を有効に発揮することが可能である。 On the other hand, the invention “Method of preventing settlement of electric pole and apparatus thereof” of Patent Document 2 has a structure in which a resistance plate and a storage cylinder are engaged, and the storage cylinder is placed on the ground surface of the power pole embedded in the ground. And a utility pole are integrally coupled via a wedge. Further, as a specific structure thereof, the resistance plate is a rectangular steel plate, and is provided on the ground surface after embedding the electric pole. Therefore, the resistance plate does not hinder the embedding of the electric pole. In addition, the resistance plate of Patent Document 2 has a shallow depth to obtain the ground supporting force compared to Patent Document 1, so that it is easy to measure the ground strength of the resistance plate installation surface in advance, and the effect of preventing settlement is obtained. It is possible to exert it effectively.
ところで、特許文献2に記載されている構造は、2枚の抵抗板を結合するための結合パイプや多数のUボルト等を必要とし、さらに抵抗板を電柱に結合するための収納筒や楔を必要とするため、構造がやや複雑であり、施工に手間を要するものであった。このため、より簡易な構造によって抵抗板の沈下防止効果を発揮し得るように改善することが望まれていた。 By the way, the structure described in Patent Document 2 requires a coupling pipe for coupling two resistance plates, a large number of U bolts, and the like, and further includes a storage cylinder and a wedge for coupling the resistance plate to the utility pole. Since it is necessary, the structure is somewhat complicated, and it takes time and labor for construction. For this reason, it has been desired to improve the resistance plate so that the resistance plate can be prevented from sinking with a simpler structure.
本発明は、上記の事情に鑑みてなされたものであり、軟弱地盤に建柱された電柱等の柱体の沈下を防止するため、この柱体を埋設する際に使用する基礎鋼管に沈下防止板を設けた構造とし、この構造がより簡易となるように改良することによって、施工の簡単化及び低コスト化を実現する基礎鋼管沈下防止構造を提供することを目的とする。 The present invention has been made in view of the above circumstances, and in order to prevent the settlement of pillars such as utility poles built on soft ground, the settlement of foundation steel pipes used when burying this pillar is prevented. An object of the present invention is to provide a structure for preventing settlement of a basic steel pipe that realizes simplification of construction and cost reduction by improving the structure so as to make the structure simpler.
上記の目的を達成するために、本発明による請求項1の基礎鋼管沈下防止構造は、下部外周に複数の爪が設けられた基礎鋼管を上方からの回転圧入によって軟弱地盤に埋設すると共に、基礎鋼管の内部に柱体の下部を挿入して固定する際、基礎鋼管に沈下防止板を固定することによって基礎鋼管及び柱体の沈下を防止するようにした基礎鋼管沈下防止構造において、基礎鋼管は、管体の上端付近に外周に張り出した鍔を形成し、沈下防止板は、基礎鋼管を嵌挿するために形成された嵌合穴を半円形に分割する位置で沈下防止板を別体に分割する分割構造を有し、分割された状態の沈下防止板の半円形穴及び外周に補強枠が設けられ、これらの分割状態の沈下防止板を結合することによって形成される円周形補強枠の外周に複数の穴部が形成され、地盤に基礎鋼管を途中まで埋設した自立状態にして基礎鋼管の地上に露出した外周を分割状態の沈下防止板の半円形穴で囲むと共に、分割状態の沈下防止板の対向せる側辺の補強枠を結合することによって形成した円周形補強枠に、地盤に回転圧入した基礎鋼管の鍔を上載した状態で、沈下防止板に形成された複数の穴部に充填剤を注入することによって、沈下防止板底面と基礎鋼管外周部の地盤を補強し、基礎鋼管と沈下防止板とを結合状態にした構造とすることを特徴とする。 In order to achieve the above object, the foundation steel pipe settlement prevention structure according to claim 1 according to the present invention embeds a foundation steel pipe provided with a plurality of claws on the outer periphery of the lower part thereof in a soft ground by rotational press-fitting from above. In the steel pipe subsidence prevention structure that prevents the subsidence of the base steel pipe and column by fixing the subsidence prevention plate to the base steel pipe when the lower part of the column is inserted and fixed inside the steel pipe, Form a ridge that protrudes to the outer periphery near the upper end of the tube, and the subsidence prevention plate is separated from the subsidence prevention plate at a position that divides the fitting hole formed to fit the basic steel pipe into a semicircular shape. A circumferential reinforcing frame having a divided structure to be divided and provided with a reinforcing frame in the semicircular hole and outer periphery of the divided subsidence prevention plate, and formed by joining these divided antisag plates Multiple holes are formed on the outer periphery of , Surrounds the outer periphery exposed on the ground foundation steel pipe in the self-supporting state of being buried halfway basic steel pipe ground in a semi-circular hole of subsidence prevention plate split state, the reinforcement of the opposite cell sides subsidence prevention plate split state By injecting a filler into a plurality of holes formed in the subsidence prevention plate in a state in which the flange of the basic steel pipe that is rotationally press-fitted into the ground is mounted on the circumferential reinforcing frame formed by joining the frames , It is characterized in that the bottom surface of the settlement subsidence plate and the ground of the outer periphery of the foundation steel pipe are reinforced and the foundation steel pipe and the settlement settlement plate are combined.
本発明の基礎鋼管沈下防止構造は、上記のように、基礎鋼管の上端付近の外周に鍔が設けられ、沈下防止板が分割構造であって、双方の分割状の沈下防止板の半円形穴を基礎鋼管の外周に嵌合すると共に、双方の分割状の沈下防止板を互いに結合することによって広面積の沈下防止板を構成し得るものである。従って、本発明の基礎鋼管沈下防止構造は、極めて簡単な構造により効率的な沈下防止効果を低コストで得ることが可能となる。 As described above, the foundation steel pipe settlement prevention structure of the present invention is provided with a flange on the outer periphery in the vicinity of the upper end of the foundation steel pipe, the settlement prevention plate is a divided structure, and the semicircular holes of both division shaped settlement prevention plates. Is fitted to the outer periphery of the basic steel pipe, and the divided anti-sag plates are joined together to form a large area anti-sag plate. Therefore, the basic steel pipe settlement prevention structure of the present invention can obtain an efficient settlement prevention effect at a low cost with a very simple structure.
また、本発明の基礎鋼管沈下防止構造の施工時には、基礎鋼管を途中まで埋設した自立状態にする。次いで、該基礎鋼管の地上に露出した外周を分割状態の沈下防止板の半円形穴で囲み、分割状態の沈下防止板の対向せる側辺の補強枠同士を結合することによって形成した円周形補強枠に、地盤に回転圧入した基礎鋼管の鍔を上載し、沈下防止板の穴部から充填剤を注入することにより、基礎鋼管の埋設施工及び沈下防止板の取付け施工を完了することが可能となる。従って、電柱等の柱体を建柱すべき箇所が軟弱地盤であっても、その現場にて、簡単な方法で沈下防止板を組立て、施工することが可能となる。 Moreover, at the time of construction of the foundation steel pipe settlement prevention structure of this invention, it is set as the self-supporting state which was laid up to the middle of the foundation steel pipe. Next, the outer circumference exposed to the ground of the basic steel pipe is surrounded by a semicircular hole of the divided state settlement prevention plate, and the circumferential shape formed by joining the reinforcing frames on the opposite sides of the divided state settlement prevention plate It is possible to complete the construction of the foundation steel pipe and the installation of the subsidence prevention plate by placing the foundation steel pipe spear rotated and pressed into the ground on the reinforcement frame and injecting the filler from the hole of the subsidence prevention plate. It becomes. Therefore, even if the place where the pole body such as the electric pole is to be built is soft ground, it is possible to assemble and install the settlement prevention plate by a simple method at the site.
また、本発明の基礎鋼管沈下防止構造の適用時には、地盤支持力を得る深さが浅いことから、容易に地盤強さが計測でき、適切に沈下防止板の大きさを設定することが可能となる。従って、電柱等の柱体を建柱すべき箇所の地盤状態に合わせて、容易かつ確実な沈下防止策が提供できる。 In addition, when the foundation steel pipe settlement prevention structure of the present invention is applied, since the depth to obtain the ground supporting force is shallow, the ground strength can be easily measured and the size of the settlement prevention plate can be appropriately set. Become. Therefore, it is possible to provide an easy and reliable settlement prevention measure in accordance with the ground state of the place where the pole body such as the electric pole should be built.
また、このような基礎鋼管沈下防止構造においては、基礎鋼管と沈下防止板との結合手段を別途設けなくても、沈下防止板の円周形補強枠に基礎鋼管の鍔を上載した構造によって、基礎鋼管の重量が沈下防止板の上方から荷重として作用し、これによって基礎鋼管と沈下防止板とが結合された状態となるため、構造の簡単化に極めて有益となる。 Moreover, in such a foundation steel pipe settlement prevention structure, without providing a separate means for connecting the foundation steel pipe and the settlement prevention plate, a structure in which the foundation steel pipe flange is mounted on the circumferential reinforcement frame of the settlement prevention plate, Since the weight of the base steel pipe acts as a load from above the sinking prevention plate, and the base steel pipe and the sinking prevention plate are connected to each other, this is extremely useful for simplifying the structure.
以下、本発明の実施例について図面を参照しながら説明する。 Embodiments of the present invention will be described below with reference to the drawings.
本発明による実施例は、図1(a)、(b)に示すように、下部外周に複数の爪2、2…が設けられた基礎鋼管1を上方からの回転圧入によって地盤に埋設すると共に、基礎鋼管1の内部に柱体4(図2参照)の下部を挿入して生コンクリート等の固定剤で固定する際、基礎鋼管1に沈下防止板3を固定することによって基礎鋼管1及び柱体4の沈下を防止するようにした基礎鋼管沈下防止構造を構成したものである。 In the embodiment according to the present invention, as shown in FIGS. 1 (a) and 1 (b), a basic steel pipe 1 provided with a plurality of claws 2, 2... Is embedded in the ground by rotational press-fitting from above. When the lower part of the column 4 (see FIG. 2) is inserted into the basic steel pipe 1 and fixed with a fixing agent such as ready-mixed concrete, the foundation steel pipe 1 and the column are fixed by fixing the subsidence prevention plate 3 to the basic steel pipe 1. This structure constitutes a foundation steel pipe settlement prevention structure that prevents the body 4 from sinking.
上記の基礎鋼管沈下防止構造に使用されている基礎鋼管1は、所定長さとして、例えば2.5mから5.0mの円筒形の鋼製管体5からなり、この管体5の上端付近には外周に張り出した円盤形状の鍔6が固定されている。なお、鍔6は、図1(a)、(b)に示すように、基礎鋼管1の上端付近の外周に間隔をあけて設けられた複数のリブ7によって補強することも可能である。また、図3に示すように、例えば直径350mmの電柱等の柱体4に対して、基礎鋼管1を直径約500mmとし、この柱体4を基礎鋼管1の内部に挿入すると、柱体4の周囲の空所に生コンクリート8を注入することによって柱体4は基礎鋼管1内で固定される。 The basic steel pipe 1 used in the above-mentioned basic steel pipe settlement prevention structure is composed of a cylindrical steel pipe body 5 having a predetermined length of, for example, 2.5 m to 5.0 m, near the upper end of the pipe body 5. A disk-shaped ridge 6 projecting to the outer periphery is fixed. Note that, as shown in FIGS. 1A and 1B, the flange 6 can be reinforced by a plurality of ribs 7 provided at intervals on the outer periphery near the upper end of the basic steel pipe 1. Further, as shown in FIG. 3, for example, with respect to a column body 4 such as a power pole having a diameter of 350 mm, when the basic steel pipe 1 has a diameter of about 500 mm and the column body 4 is inserted into the basic steel pipe 1, The column 4 is fixed in the basic steel pipe 1 by pouring the ready-mixed concrete 8 into the surrounding voids.
また、図2(a)、(b)に示すように、柱体4を基礎鋼管1内で横方向に移動することにより、柱体4の周辺の障害物等を避けた状態にすることができる。また、基礎鋼管1内における柱体4の周囲の空所に生コンクリート8を注入することによって柱体4を所定位置に固定することができる。 Further, as shown in FIGS. 2A and 2B, the column body 4 is moved in the lateral direction in the basic steel pipe 1 to avoid the obstacles around the column body 4. it can. Moreover, the column body 4 can be fixed at a predetermined position by pouring the ready-mixed concrete 8 into a space around the column body 4 in the basic steel pipe 1.
図1(b)に示すように、基礎鋼管1の上端付近に固定された鍔6は、沈下防止板3へ鉛直方向の荷重を伝達する。また、基礎鋼管1の下端外周には間隔をあけて複数の爪2、2…が下方向に突出した状態で固定されている。 As shown in FIG. 1B, the rod 6 fixed near the upper end of the foundation steel pipe 1 transmits a vertical load to the settlement prevention plate 3. Further, a plurality of claws 2, 2... Are fixed to the outer periphery of the lower end of the basic steel pipe 1 with a gap protruding downward.
さらに、図1(a)、(b)に示すように、上記の基礎鋼管1の上端には直径方向の2箇所に一対の回転板12が固定されている。回転板12に形成された丸孔部12bには回転工具13(図4(b)参照)が嵌め込まれ、回転工具13に形成された中心穴(不図示)にアースオーガ回転装置10を係止することによって基礎鋼管1の回転圧入が可能となる。従って、基礎鋼管1を地盤中に回転圧入する際には、図4(b)に示すように、基礎鋼管1の上端に取り付けた回転工具13を介して、アースオーガ回転装置10で回転しつつ押圧すると、複数の爪2、2…が土壌を掘削しながら基礎鋼管1を下方向に進入させることができる。 Furthermore, as shown to Fig.1 (a), (b), a pair of rotary plate 12 is being fixed to the upper end of said basic steel pipe 1 at two places of a diametrical direction. A rotary tool 13 (see FIG. 4B) is fitted into the round hole 12b formed in the rotary plate 12, and the earth auger rotary device 10 is locked in a center hole (not shown) formed in the rotary tool 13. By doing so, the rotary press-fitting of the basic steel pipe 1 becomes possible. Therefore, when the foundation steel pipe 1 is rotationally press-fitted into the ground, it is rotated by the earth auger rotating device 10 via the rotary tool 13 attached to the upper end of the foundation steel pipe 1 as shown in FIG. When pressed, the plurality of claws 2, 2... Can cause the foundation steel pipe 1 to enter downward while excavating the soil.
また、図2(a)、(b)又は図3に示すように、基礎鋼管1の回転板12から回転工具13を取り外した状態にして、一対の回転板12の各凹部12a(図1(a)、(b)参照)に、後述する柱体受台14の上端に設けられた掛板14cを引掛けることによって、基礎鋼管1の内腔上部に柱体受台14を取付けることが可能となる。 Further, as shown in FIGS. 2A, 2B, or 3, the rotary tool 13 is removed from the rotary plate 12 of the basic steel pipe 1, and the concave portions 12a of the pair of rotary plates 12 (FIG. It is possible to attach the column base 14 to the upper part of the inner cavity of the basic steel pipe 1 by hooking a hanging plate 14c provided at the upper end of the column base 14 to be described later on (see a) and (b)). It becomes.
一方、本実施例の沈下防止板3は、図1(a)に示すように、基礎鋼管1を嵌挿するために形成された嵌合穴9を半円形に分割する位置で、沈下防止板3を別体に分割する分割構造を有している。即ち、図1(b)に示すように、一体結合された状態の沈下防止板3は内部に基礎鋼管1を挿通する円形の嵌合穴9が形成され、図1(a)に示すように、沈下防止板3を分割すると、分割状態の沈下防止板3(以下、「分割沈下防止板3a、3b」と云う)は互いに対向する側辺に半円形穴9a、9b(図3参照)が形成された状態となる。 On the other hand, as shown in FIG. 1A, the settlement prevention plate 3 of this embodiment is a settlement prevention plate at a position where the fitting hole 9 formed for fitting the basic steel pipe 1 is divided into a semicircular shape. It has a split structure that splits 3 into separate bodies. That is, as shown in FIG. 1 (b), the anti-sag plate 3 in an integrally coupled state is formed with a circular fitting hole 9 through which the basic steel pipe 1 is inserted, as shown in FIG. 1 (a). When the subsidence prevention plate 3 is divided, the divided subsidence prevention plate 3 (hereinafter referred to as “divided subsidence prevention plates 3a and 3b”) has semicircular holes 9a and 9b (see FIG. 3) on the sides facing each other. It will be in the formed state.
このような分割沈下防止板3a、3bの夫々には、半円形穴9a、9b及び外周に補強枠16が設けられている。また、これらの分割沈下防止板3a、3bを結合することによって、半円形穴9a、9bの枠体からなる円周形枠17形成される。さらに、この円周形枠17の外周には複数の穴部18が形成され、図1(b)に示すように、この穴部18に充填剤19を注入することによって沈下防止板3の底面と基礎鋼管1の外周部の地盤を補強することが可能となる。 In each of such divided settlement prevention plates 3a and 3b, semicircular holes 9a and 9b and a reinforcing frame 16 are provided on the outer periphery. Further, by joining these divided subsidence prevention plates 3a and 3b, a circumferential frame 17 composed of a frame of semicircular holes 9a and 9b is formed. Further, a plurality of holes 18 are formed on the outer periphery of the circumferential frame 17, and as shown in FIG. 1 (b), the bottom surface of the subsidence prevention plate 3 is injected by injecting a filler 19 into the holes 18. And it becomes possible to reinforce the ground of the outer peripheral part of the foundation steel pipe 1.
また、図1(a)に示すように、夫々の分割沈下防止板3a、3bは、一対の半円形穴9a、9b(図3参照)の両辺に設けられた補強枠16c、16cの複数位置にボルト孔20が形成されている。従って、図1(b)に示すように、双方の分割沈下防止板3a、3bの半円形穴9a、9bで基礎鋼管1の周囲を嵌合した状態にして、双方の分割沈下防止板3a、3bの互いに対向する補強枠16c、16c同士を合致して各ボルト孔20にボルト21を挿通してナット22で締結することにより、分割沈下防止板3a、3bを一体結合することが可能となる。 Further, as shown in FIG. 1 (a), each of the divided subsidence prevention plates 3a, 3b has a plurality of positions of reinforcing frames 16c, 16c provided on both sides of the pair of semicircular holes 9a, 9b (see FIG. 3). Bolt holes 20 are formed in the upper part. Therefore, as shown in FIG. 1 (b), both the divided subsidence prevention plates 3a, 3b are fitted into the semicircular holes 9a, 9b of both the divided subsidence prevention plates 3a, 3b. The divided subsidence prevention plates 3a and 3b can be integrally joined by matching the reinforcing frames 16c and 16c of 3b facing each other, inserting bolts 21 into the respective bolt holes 20 and fastening them with nuts 22. .
このようにして形成された一体結合後の沈下防止板3の円周形補強枠17の内側の嵌合穴9に嵌合された基礎鋼管1は、この嵌合穴9に対して摺動可能であるため、図1(b)に示すように、基礎鋼管1を嵌合穴9に沿って下方に移動すると、基礎鋼管1の鍔6が沈下防止板3の円周形補強枠17の上端に当って載置された状態で停止する。従って、このような構造においては、基礎鋼管1と沈下防止板3との結合手段を別途設けなくても、基礎鋼管1の重量が沈下防止板3の上方から荷重として作用し、これによって基礎鋼管1と沈下防止板3とが固定された状態となる。 The basic steel pipe 1 fitted in the fitting hole 9 inside the circumferential reinforcing frame 17 of the anti-sag plate 3 thus formed integrally is slidable with respect to the fitting hole 9. Therefore, as shown in FIG. 1 (b), when the basic steel pipe 1 is moved downward along the fitting hole 9, the flange 6 of the basic steel pipe 1 is moved to the upper end of the circumferential reinforcing frame 17 of the subsidence prevention plate 3. Stops in a state where it is placed. Therefore, in such a structure, the weight of the base steel pipe 1 acts as a load from above the subsidence prevention plate 3 without providing a separate means for connecting the base steel pipe 1 and the subsidence prevention plate 3. 1 and the settlement prevention plate 3 are fixed.
なお、図3に示すように、沈下防止板3を分割してなる各分割沈下防止板3a、3bは、必ずしも均等な面積である必要はなく、地盤の状況や周辺の障害物等の状況によって、何れかに偏った面積に形成することも可能である。この場合、各分割沈下防止板3a、3bの内部に設ける補強枠は、図3に示すように、円周形補強枠17の左右均等の中心から対向する辺に対して直角となるようにアングル材16aを溶接接合することによって構成してもよい。 As shown in FIG. 3, the divided subsidence prevention plates 3a and 3b formed by dividing the subsidence prevention plate 3 do not necessarily have an equal area, depending on the ground conditions and surrounding obstacles. It is also possible to form in an area that is biased to any one. In this case, as shown in FIG. 3, the reinforcing frame provided inside each of the divided subsidence prevention plates 3a and 3b is angled so as to be perpendicular to the opposite side from the left and right equal centers of the circumferential reinforcing frame 17. You may comprise by welding the material 16a.
なお、地盤支持力によっては、各分割沈下防止板3aを2枚組み込むことも可能となるよう、補強枠16にボルト孔20を設け、ボルトとナットで結合することも可能である。 Depending on the ground supporting force, it is also possible to provide a bolt hole 20 in the reinforcing frame 16 so that two divided subsidence prevention plates 3a can be incorporated, and to connect them with bolts and nuts.
図2(a)、(b)に示す柱体受台14は、左右の長尺の金属帯板14a、14aと、左右の金属帯板14a、14aの下端に固定した柱台14bと、左右の金属帯板の上端に固定したL字形に形成してなる掛板14c、14cとからなる。また、図2(a)、(b)に示す基礎鋼管1の内部に柱体受台14を挿入すると共に、基礎鋼管1の上端外周に固定された回転板12の凹部12aに柱体受台14の掛板14cを掛止することによって、柱台14bが基礎鋼管1の内部の所定高さに位置することとなる。そして、基礎鋼管1に挿入した柱体4は柱台14bに支持された状態となり、この状態で基礎鋼管1内における柱体4の周囲に生コンクリート8を注入することとなる。 2 (a) and 2 (b) includes a left and right long metal strips 14a and 14a, a column base 14b fixed to the lower ends of the left and right metal strips 14a and 14a, It is made up of hanging plates 14c and 14c formed in an L shape fixed to the upper end of the metal band plate. 2A and 2B, the column base 14 is inserted into the basic steel pipe 1 and the column base is received in the recess 12a of the rotating plate 12 fixed to the outer periphery of the upper end of the basic steel pipe 1. The base 14b is positioned at a predetermined height inside the basic steel pipe 1 by hooking the 14 hanging plates 14c. And the column 4 inserted in the foundation steel pipe 1 will be in the state supported by the column 14b, and the ready-mixed concrete 8 will be inject | poured around the pillar 4 in the foundation steel pipe 1 in this state.
次に、上記のように構成された基礎鋼管沈下防止構造1の施工方法について説明する。まず、図4(a)に示すように、柱体4を建柱すべき地盤に沈下防止板の設置が可能な面積の床堀り23を施し、基礎鋼管1の回転圧入位置における埋設物の有無を確認するため、例えば1m程度の深度まで手掘り等より先行孔26を掘削する。 Next, a construction method of the basic steel pipe settlement prevention structure 1 configured as described above will be described. First, as shown in FIG. 4 (a), a floor digging 23 having an area where a settlement prevention plate can be installed is applied to the ground on which the column body 4 is to be built, and the buried object at the rotary press-fitting position of the foundation steel pipe 1 is provided. In order to confirm the presence or absence, the leading hole 26 is excavated by hand digging to a depth of about 1 m, for example.
次に、図4(b)に示すように、地盤に形成された先行孔26に基礎鋼管1の建て込みを行なう。この際、基礎鋼管1の上端の回転板12に嵌合した回転工具13を介してアースオーガ回転装置10で回転しつつ押圧することによって基礎鋼管1を地盤中に進入させ、基礎鋼管1の周囲に地盤沈下防止板3の取付け作業を行い得る高さまで基礎鋼管1を埋設することによって該基礎鋼管1を自立状態にする。 Next, as shown in FIG.4 (b), the foundation steel pipe 1 is erected in the preceding hole 26 formed in the ground. At this time, the foundation steel pipe 1 is caused to enter the ground by pressing while rotating with the earth auger rotating device 10 via the rotary tool 13 fitted to the rotating plate 12 at the upper end of the foundation steel pipe 1, The foundation steel pipe 1 is made self-supporting by burying the foundation steel pipe 1 to a height at which the ground subsidence prevention plate 3 can be attached.
次いで、図4(c)に示すように、砕石23aを敷き詰めることによって床堀面養生を行った後、基礎鋼管1の地上に露出した外周を一方の分割沈下防止板3aの半円形穴9a(図3参照)で囲む。また、基礎鋼管1の残りの周囲を他方の分割沈下防止板3bの半円形穴9bで囲み、図3に示すように双方の分割沈下防止板3a、3bの補強枠16c、16c同士をボルト21とナット22で結合する。 Next, as shown in FIG. 4 (c), after performing ground excavation by laying crushed stones 23a, the outer periphery exposed to the ground of the basic steel pipe 1 is formed into a semicircular hole 9a ( (See FIG. 3). Further, the remaining periphery of the basic steel pipe 1 is surrounded by a semicircular hole 9b of the other divided subsidence prevention plate 3b, and the reinforcing frames 16c and 16c of both divided subsidence prevention plates 3a and 3b are bolted 21 as shown in FIG. And a nut 22.
次いで、再び上記のように基礎鋼管1を回転しつつ押圧することにより、図4(d)に示すように、基礎鋼管1を地盤中に進入させ、基礎鋼管1の鍔6が沈下防止板3の円周形補強枠17の上端に当るまで回転圧入し、基礎鋼管1の鍔6を沈下防止板3の円周形補強枠17に上載した状態とする。これによって、基礎鋼管1の埋設施工及び沈下防止板の取付け施工を完了する。 Next, as shown in FIG. 4 (d), the foundation steel pipe 1 is caused to enter the ground by pressing the foundation steel pipe 1 while rotating again as described above. Rotating and press-fitting until reaching the upper end of the circumferential reinforcing frame 17, and the flange 6 of the basic steel pipe 1 is placed on the circumferential reinforcing frame 17 of the settling prevention plate 3. Thereby, the burial construction of the foundation steel pipe 1 and the installation work of the settlement prevention plate are completed.
次いで、図4(e)に示すように、沈下防止板3の穴部18(図1(b)参照)に充填剤19を注入することによって沈下防止板3の底面と基礎鋼管1の外周部の地盤を補強する。 Next, as shown in FIG. 4 (e), the bottom surface of the subsidence prevention plate 3 and the outer periphery of the basic steel pipe 1 are injected by injecting a filler 19 into the hole 18 (see FIG. 1B) of the subsidence prevention plate 3. Reinforce the ground.
そして、上記の基礎鋼管1内に柱体4を固定するには、図2(a)、(b)で説明したように、上記の基礎鋼管1内の上部に柱体受台14を設け、基礎鋼管1内に上方から挿入した柱体4を柱体受台14で支持する。 And in order to fix the column 4 in the said basic steel pipe 1, as demonstrated in FIG. 2 (a), (b), the column base 14 is provided in the upper part in said basic steel pipe 1, A column body 4 inserted from above into the basic steel pipe 1 is supported by a column body cradle 14.
次いで、図4(f)に示すように、基礎鋼管1内における柱体受台14の周囲に生コンクリート8を流し込むことによって、基礎鋼管1の外周を生コンクリート8によって固め、床掘り23の空間に土壌24を埋め戻す。 Next, as shown in FIG. 4 (f), by pouring the ready-mixed concrete 8 around the column base 14 in the foundation steel pipe 1, the outer periphery of the foundation steel pipe 1 is solidified by the ready-mixed concrete 8, and the space of the floor digging 23. The soil 24 is backfilled.
本発明の基礎鋼管沈下防止構造は、軟弱地盤に建柱された電柱等の柱体の沈下を防止するため、この柱体を埋設する際に使用する基礎鋼管に沈下防止板を設けた構造とし、この構造がより簡易となるように改良することによって、施工の簡単化及び低コスト化を実現するようにした基礎鋼管沈下防止構造として利用可能である。 The steel pipe subsidence prevention structure of the present invention has a structure in which a subsidence prevention plate is provided on the base steel pipe used to embed the pole body in order to prevent the subsidence of a pole body such as a utility pole built on soft ground. By improving the structure so as to be simpler, the structure can be used as a structure for preventing the subsidence of the basic steel pipe so as to realize simplification of construction and cost reduction.
1 基礎鋼管
2 爪
3 沈下防止板
3a、3b 分割沈下防止板
4 柱体
5 管体
6 鍔
7 リブ
8 生コンクリート
9 嵌合穴
9a、9b 半円形穴
10 アースオーガ回転装置
11 建柱車
12 回転板
12a 凹部
12b 丸孔部
13 回転工具
14 柱体受台
14a 金属帯板
14b 柱台
14c 掛板
16 補強枠
16a、16b アングル材
16c 互いに対向する補強枠
17 円周形補強枠
18 穴部
19 充填剤
20 ボルト孔
21 ボルト
22 ナット
23 床掘り
23a 砕石
24 埋め戻した土壌
25 基礎鋼管内の土壌
26 先行孔
DESCRIPTION OF SYMBOLS 1 Basic steel pipe 2 Claw 3 Settlement prevention plates 3a, 3b Divided settlement prevention plate 4 Column body 5 Tube body 6 鍔 7 Rib 8 Ready-mixed concrete 9 Fitting hole 9a, 9b Semi-circular hole 10 Earth auger rotating device 11 Construction column wheel 12 rotation Plate 12a Recess 12b Round hole 13 Rotating tool 14 Column base 14a Metal strip 14b Column base 14c Suspension plate 16 Reinforcement frames 16a and 16b Angle member 16c Reinforcement frame 17 facing each other Reinforcing frame 18 Hole 19 Filling Agent 20 Bolt hole 21 Bolt 22 Nut 23 Floor digging 23a Crushed stone 24 Backfilled soil 25 Soil 26 in the foundation steel pipe Leading hole
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KR101661238B1 (en) * | 2015-01-15 | 2016-09-29 | 주식회사 케이지테크 | Post fixing apparatus and post construction mothed using the same |
JP6118487B2 (en) * | 2015-10-03 | 2017-04-19 | 株式会社ビル技研 | Friction prevention parts for screw piles, screw piles, and foundation pile construction methods using screw piles |
CN108018869A (en) * | 2017-11-10 | 2018-05-11 | 天津大学 | A kind of collapsible mud mat basis with skirtboard |
JP2021085140A (en) * | 2019-11-25 | 2021-06-03 | 東日本旅客鉄道株式会社 | Column body installation structure |
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JPS5996311A (en) * | 1982-11-22 | 1984-06-02 | 渡辺 嗣彦 | Construction of foundation of beacon pole |
JPS59122625A (en) * | 1982-12-28 | 1984-07-16 | Asahi Chem Ind Co Ltd | Fitting device for columnar leg of structure |
JPS62228571A (en) * | 1986-03-29 | 1987-10-07 | 渡辺 彦逸 | Fixing fittings of sinking preventing apparatus |
JPH0625422B2 (en) * | 1988-10-07 | 1994-04-06 | 渡辺 嗣彦 | Pipe foundation for poles |
JPH086544B2 (en) * | 1989-07-11 | 1996-01-24 | 東京電力株式会社 | Construction method of self-supporting power pole and its basic structure |
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