JP3093046U - Steel pipe foundation pile - Google Patents

Abstract

(57)【要約】 【課題】 軟質地層にも硬質地層にも、杭を回転させて
無振動、無騒音でスムーズに施工出来る鋼管基礎杭を提
供する。 【解決手段】鋼管１の先端に頭部２を嵌合固着した鋼管
杭Ｐであって、頭部２は鋼管１内へ嵌入する突出胴２２
を備えた円筒部２０と円筒部先端の円錐ヘッド２１とで
構成し、円筒部２０外周には緩傾斜の略半周長の掘進羽
根２３，２３´の２枚を、円錐ヘッド２１外周面にも緩
傾斜の略半周長の切削羽根２４，２４´を、各掘進羽根
相互及び各切削羽根相互を１８０°回転対称に配置し、
地山に対して、同一レベルで、常に１８０°対称の２個
所で切削及び掘進作用を付与する。 (57) [Summary] [PROBLEMS] To provide a steel pipe foundation pile which can be smoothly constructed without vibration and noise by rotating a pile in both a soft formation and a hard formation. A steel pipe pile (P) having a head (2) fitted and fixed to the tip of a steel pipe (1), wherein the head (2) is a protruding body (22) fitted into the steel pipe (1).
And a conical head 21 at the tip of the cylindrical portion, and two gently inclined substantially semi-peripheral excavating blades 23 and 23 ′ are provided on the outer peripheral surface of the cylindrical portion 20. The cutting blades 24, 24 'having a semi-peripheral length with a gentle inclination are arranged such that the respective excavating blades and the respective cutting blades are rotated 180 ° rotationally symmetrically,
The cutting and excavating actions are always applied to the ground at two points at the same level and always at 180 ° symmetry.

Description

【考案の詳細な説明】[Detailed description of the device]

【０００１】[0001]

【考案の属する技術分野】[Technical field to which the device belongs]

本考案は、中低層のアパート、マンション等の建物や倉庫の基礎杭であり、よ り詳しくは、杭先端に切削刃（切削羽根）及び支持羽根（掘進羽根）を備え、下 方に押圧しながら杭を回転させて無振動、無騒音、無排土で杭打ち施工可能なも のであり、建築物の基礎工事の技術分野に属するものである。   The present invention is a foundation pile for buildings such as middle- and low-rise apartments and condominiums, and warehouses. More specifically, the pile tip is equipped with a cutting blade (cutting blade) and a supporting blade (digging blade), Rotating the pile while pressing it to the direction allows for pile driving without vibration, noise, and soil removal. Therefore, it belongs to the technical field of foundation work for buildings.

【０００２】[0002]

【従来の技術】[Prior art]

〔従来例１（図４）〕 鋼管杭の先端に掘削刃及び螺旋翼を備えたものは特公平２−６２６４８号公報 で提案されている。 即ち、図４に示す如く、鋼管製の杭本体の先端を底板で閉止し、底板には下方 に向けて掘削刃の２片を突設し、杭本体の下端部には外周面に沿って翼幅の大き い螺旋翼をほぼ１巻きに亘り突設している。 [Conventional example 1 (FIG. 4)]   Japanese Patent Publication No. 2-62648 discloses a steel pipe pile equipped with an excavating blade and a spiral blade. Has been proposed by.   That is, as shown in Fig. 4, the steel pipe pile main body is closed at its tip with a bottom plate, and Two pieces of excavating blades are projected toward the bottom of the pile body, and the blade width increases along the outer peripheral surface at the lower end of the pile body. A large number of spiral blades are provided so as to project.

【０００３】 そして、軟弱地盤にねじ込むように回転させながら地中に押圧し、下端の掘削 刃によって杭本体先端の土砂を掘削軟化させて、杭側面の未掘削土砂中に螺旋翼 を喰い込ませ、土の耐力を反力として杭体を回転推進しつつ、掘削軟化した土砂 を杭側面に押出圧縮し、無排土で地中に杭体をねじ込んで行くものである。[0003]   Then, while pushing it into the soft ground, it pushes into the ground while rotating it to excavate the bottom end. The blade softens the soil at the tip of the pile body by excavating it, and the spiral blade is put into the unexcavated soil on the side of the pile. The soil is softened by excavating the pile while rotating the pile body by using the yield strength of the soil as a reaction force. Is extruded and compressed to the side of the pile, and the pile is screwed into the ground without soil discharge.

【０００４】 〔従来例２（図５）〕 また、ねじ込み杭の先端を円錐部として円錐部周面に多数の刃を付設したもの も実公平４−３９２９３号公報により提案されている。 即ち、図５に示す如く、杭部材には支持用の拡径翼を外周に配置し、内部をコ ンクリート充填すると共に、下端に雌ネジ部材を、上端に雄ネジ部材を配置して 接続長尺化可能とし、円錐状で杭部材の外径よりも大径の先端シューの内部にも コンクリート充填すると共に、上端中央に雄ネジ部材を突設し、シュー外周面に は多数の刃を螺旋状に分散形態で取付け、該シューを杭部材の先端に螺合固定し てねじ込み杭とするものである。[0004] [Conventional example 2 (FIG. 5)]   In addition, the tip of the screwed pile is a conical part with many blades attached to the peripheral surface of the conical part. Is also proposed by Japanese Utility Model Publication No. 4-39293.   That is, as shown in Fig. 5, the pile members are provided with supporting expanded blades on the outer periphery, and the inside is In addition, the internal screw member is placed on the lower end and the male screw member is placed on the upper end. Connection length can be increased, and it can be used inside the tip shoe that is conical and has a diameter larger than the outer diameter of the pile member. While filling with concrete, a male screw member is projected at the center of the upper end, Attaches a large number of blades in a spiral form in a distributed form and screw-fastens the shoe to the tip of the pile member. It is a screwed pile.

【０００５】 そして、杭部材の上端に回転を与えながら杭部材を地中にねじ込み、新たな杭 部材をネジ接合してねじ込むことにより、杭部材間の接合部で接合強度が増し、 更に、杭部材より大径の先端シューにより杭部材の地中への貫入を容易とするも のである。[0005]   Then, while rotating the upper end of the pile member, screw the pile member into the ground and By joining and screwing members together, the joint strength increases at the joints between pile members, Furthermore, the tip shoe having a diameter larger than that of the pile member facilitates penetration of the pile member into the ground. Of.

【０００６】[0006]

【考案が解決しようとする課題】[Problems to be solved by the device]

従来例１（図４）のものは、無振動、無騒音、無排土で杭打ち出来るものでは あるが、杭本体の外径のほぼ２〜３倍の外径を有する螺旋翼を内周端縁の鋼管外 周に巻き付け溶接するのは煩雑、且つ熟練を要する困難な作業であり、底板の鋼 管端への溶接取付け、及び掘削刃の底板への溶接取付けも煩雑な作業である。   The conventional example 1 (Fig. 4) is one that can be piled without vibration, noise, and soil. However, the spiral blade having an outer diameter that is approximately 2 to 3 times the outer diameter of the pile body is used outside the steel pipe on the inner peripheral edge. Winding and welding around the circumference is a complicated and difficult work that requires skill, and the steel of the bottom plate Welding attachment to the pipe end and welding attachment to the bottom plate of the excavating blade are also complicated operations.

【０００７】 そして、先端が底板であって底板外周部に掘削刃が存在するため、地盤の浅い 所に硬い地層のある場合や、支持地盤までに特に硬い地層は無くても途中の杭先 端位置に転石や岩塊等の障害物がある場合には、杭先端の底板が障害物を貫通す ることは出来なく、所定地盤深度まで杭を打込むことが出来ない。 しかも、螺旋翼が連続１ピッチ長であるため、掘進突入作用点（螺旋翼下端） が外周の１点のみとなること、及び先端が底板であることにより、杭１は回転掘 進時に芯ずれを生じ易く、平滑な掘進作用が期待出来ない。[0007]   And because the tip is the bottom plate and the excavating blade exists on the outer periphery of the bottom plate, the ground is shallow. Where there is a hard formation, or even if there is no particularly hard formation up to the supporting ground, the pile point in the middle If there are obstacles such as boulders or rocks at the end position, the bottom plate of the pile will penetrate the obstacle. It is not possible to drive it, and it is not possible to drive a pile to the specified ground depth.   Moreover, since the spiral blade has a continuous pitch of 1 pitch, the excavation plunge action point (lower end of the spiral blade) Since only one point is on the outer circumference and the tip is the bottom plate, the pile 1 is rotary excavated. Misalignment is likely to occur at the time of advancement, and a smooth excavation action cannot be expected.

【０００８】 また、従来例２のものにあっても、杭部材外周への拡径翼の溶接取付けや先端 シューの外殻表面への刃の溶接取付けは、例１のものと同様に、煩雑、且つ熟練 を要する困難な作業であり、例え型鋳造しようとしても、先端シューの外形及び 多数の刃の配置形態から型枠組みが非常に煩雑、且つ困難であるため、分割鋳造 品の溶接一体化となって均質強度を有する先端シューの製造が困難であると共に 、製作コストも高くなる。[0008]   In addition, even in the conventional example 2, the welding attachment of the expanding blade to the outer periphery of the pile member or the tip The welding attachment of the blade to the surface of the outer shell of the shoe is complicated and skilled as in the case of Example 1. This is a difficult task that requires the shape of the tip shoe and Split casting because the mold framework is very complicated and difficult due to the arrangement of many blades It is difficult to manufacture a tip shoe with uniform strength as the products are welded together. Also, the manufacturing cost will increase.

【０００９】 そして、先端シューの外径は杭本体の杭部材外径より大であるため、杭打込み 時には、杭本体外周面の土質は先端シューによって切削されて杭部材の貫入は容 易とはなるが、杭部材外周部の土質を切削するため、杭部材外周面の摩擦支持力 は低下し、杭部材外周面に配置した拡径翼での支持力負担が大となる。[0009]   Since the outer diameter of the tip shoe is larger than the outer diameter of the pile member of the pile body, At times, the soil on the outer surface of the pile body is cut by the tip shoe and the penetration of the pile member is Although it is easy, because the soil around the pile member is cut, the friction bearing force of the pile member outer peripheral surface Is reduced, and the bearing load of the expanded blades arranged on the outer peripheral surface of the pile member becomes large.

【００１０】 本考案は、これら摩擦杭の問題点を、解決又は改善するものであり、低コスト で製作出来、且つ、転石や岩塊の存在する土質でも所定位置に杭打ち出来る切削 力を発揮し、且つ、強大な杭支持力を発揮する新規な頭部を備えた鋼管基礎杭を 提供するものである。[0010]   The present invention solves or improves the problems of these friction piles, and at a low cost. Cutting that can be made in the same way, and can be piled in place even in the soil with boulders and rocks A steel pipe foundation pile with a new head that exerts power and also has a strong pile support force. It is provided.

【００１１】[0011]

【課題を解決するための手段、及び作用】[Means and Actions for Solving the Problems]

本考案鋼管杭Ｐは、例えば図１に示す如く、杭本体１の先端に円筒部２０及び 円錐ヘッド２１から成る頭部２を嵌合固着した杭Ｐであって、円筒部２０の外周 面には略半周長の掘進羽根２３，２３´の２枚を緩傾斜角θ２３で、円錐ヘッド ２１の外周面には略半周長の切削羽根２４，２４´の２枚を、掘進羽根傾斜角θ ２３と同角度か、やや大きな角度θ２４で、且つ、各２枚の羽根相互を回転中心 線（Ｘ−Ｘ）に対して１８０°回転対称に、配置したものである。   The steel pipe pile P of the present invention has a cylindrical portion 20 and a cylindrical portion 20 at the tip of the pile body 1 as shown in FIG. A pile P having a head portion 2 composed of a conical head 21 fitted and fixed thereto, the outer periphery of the cylindrical portion 20. Two semi-peripheral excavation blades 23 and 23 'with a gentle inclination angle θ23 on the surface On the outer peripheral surface of 21, two cutting blades 24, 24 'having a substantially half circumference are provided, and the cutting blade inclination angle θ 23 or slightly larger angle θ24, and the center of rotation of each two blades It is arranged in 180 ° rotational symmetry with respect to the line (XX).

【００１２】 尚、「１８０°対称」とは、図１の軸線Ｘ−Ｘに対して１８０°回転させれば 同一形態が表出することを意味し、例えば図１に於いて、頭部２上の掘進羽根２ ３及び切削羽根２４が、右側では左方へ下降形態で表出し、掘進羽根２３´及び 切削羽根２４´が左側では右方へ上界形態となっているが、頭部を軸線Ｘ−Ｘの 周りに１８０°回転させれば、左側の掘進羽根２３´及び切削羽根２４´が右側 となり、且つ図１の掘進羽根２３及び切削羽根２４の位置を占めることを意味す る。[0012]   It should be noted that “180 ° symmetry” means that when rotated by 180 ° with respect to the axis X-X in FIG. This means that the same form appears, and in FIG. 1, for example, the excavation blade 2 on the head 2 3 and the cutting blade 24 are exposed to the left in a descending form on the right side, and the excavation blade 23 'and On the left side, the cutting blade 24 'is in the upper boundary form to the right, but the head is placed on the axis line XX. If it is rotated 180 ° around it, the cutting blade 23 'on the left side and the cutting blade 24' on the right side And means to occupy the positions of the advancing blade 23 and the cutting blade 24 of FIG. It

【００１３】 また、掘進羽根２３，２３´の傾斜角及び切削羽根２４，２４´の傾斜角は、 必要に応じて決定するものであり、杭Ｐの回転押込み、即ち頭部２の回転押込み 時に円筒部２０上の掘進羽根２３，２３´が杭Ｐの掘進案内を、円錐ヘッド２１ 上の切削羽根２４，２４´が杭先端の地山を切削掘進すれば良く、切削羽根角θ ２４が掘進羽根角θ２３と略同角であれば、切削羽根２４，２４´の作用は、主 として掘進羽根同様の地山への切込み推進作用となり、杭先端部での地山の撹拌 抵抗が抑制出来、平滑な掘進作用が得られる。 そして、切削羽根角θ２４を若干大とすれば、羽根面による地山破砕応力が発 生し、硬い地層に対する切削力が生じる。 そのため、「やや大きな傾斜角θ２４」は、掘進羽根傾斜角θ２３プラス１０ °以内であるのが好ましい。 また、頭部２を嵌合固着の意は、杭Ｐの掘進作用時に頭部２が杭本体１との一 体化を保証出来れば良く、頭部嵌入時に一体化接着しても良いが、頭部２を杭本 体１との嵌入部で溶接するのが作業上好ましい。[0013]   In addition, the inclination angle of the excavation blades 23 and 23 'and the inclination angle of the cutting blades 24 and 24' are It is determined as necessary, and the push-in of the pile P, that is, the push-in of the head 2 is performed. Sometimes the excavation blades 23, 23 'on the cylindrical portion 20 guide the excavation of the pile P, and the conical head 21 It suffices if the upper cutting blades 24, 24 'cut and excavate the natural ground at the tip of the pile, and the cutting blade angle θ If 24 is approximately the same as the excavation blade angle θ23, the action of the cutting blades 24, 24 'is mainly As a result, it has the same propulsion effect on the ground as the cutting blade, and the ground is agitated at the tip of the pile. Resistance can be suppressed and a smooth digging action can be obtained.   Then, if the cutting blade angle θ24 is set to be slightly large, natural crushing stress is generated by the blade surface. And a cutting force is generated on a hard formation.   Therefore, the “slightly large inclination angle θ24” is the excavation blade inclination angle θ23 plus 10 It is preferably within °.   Further, the purpose of fitting and fixing the head portion 2 is that the head portion 2 does not come into contact with the pile main body 1 during the digging action of the pile P. It is only necessary to ensure physicalization, and it may be integrally bonded when inserting the head, but the head 2 is piled It is preferable in terms of work to weld at the fitting portion with the body 1.

【００１４】 従って、本考案の杭Ｐにあっては、杭Ｐの製作は頭部２を杭本体１先端に嵌着 固定したものであるため、頭部２を別体として型鋳造して杭本体１に嵌入溶接す れば良く、複雑な形態の頭部２を備えた杭Ｐが合理的に製作出来る。 また、頭部２の外周面に配置した各掘進羽根２３，２３´、及び切削羽根２４ ，２４´が１８０°回転対称の略半周羽根であるため、頭部２は２分割型を用い て容易に鋳造出来る。[0014]   Therefore, in the pile P of the present invention, the pile P is manufactured by fitting the head 2 onto the tip of the pile body 1. Since it is fixed, the head 2 is cast as a separate body and is welded to the pile body 1 by fitting. All that is required is to rationally manufacture the pile P including the head 2 having a complicated shape.   In addition, each of the excavation blades 23, 23 'arranged on the outer peripheral surface of the head 2 and the cutting blade 24 , 24 'are substantially half-peripheral blades with 180 ° rotational symmetry, so the head 2 uses a two-part type And can be easily cast.

【００１５】 また、各羽根２３，２３´及び２４，２４´は、略半周で１８０°対称配置、 即ち、分割対称配置であるため、頭部上での羽根２３，２４の配置域長Ｚ２３， Ｚ２４は、連続螺旋形態での羽根長さ配置域の１／２長さ内に収めることが出来 、即ち、螺旋半周内に螺旋１周分の羽根を収めることが出来、限られた長さの頭 部２上での各羽根の傾斜角の設定の自由度があり、各掘進羽根間及び切削羽根間 は土詰りの生じない配置と出来る。[0015]   Further, the blades 23, 23 'and 24, 24' are arranged in a 180 ° symmetrical arrangement about a half circumference, That is, because of the divided symmetrical arrangement, the arrangement area length Z23 of the blades 23, 24 on the head, Z24 can fit within 1/2 length of blade length arrangement area in continuous spiral form In other words, it is possible to fit the blades for one turn of the spiral within the half turn of the spiral, and the head of a limited length. There is a degree of freedom in setting the inclination angle of each blade on the part 2, and between each excavation blade and between cutting blades. Can be placed without clogging.

【００１６】 そして、各掘進羽根２３，２３´相互、及び各切削羽根２４，２４´相互が１ ８０°回転対称であるため、杭Ｐの回転押込み時には、杭Ｐの回転押圧力により 生ずる掘進作用応力、及び切削作用応力が１８０°対称で協同作用し、地山の同 一水準位置で２個所同一の切削及び掘進作用が生じるため、杭Ｐの切削及び掘進 作用が平滑となる。[0016]   And each excavation blade 23, 23 'mutual and each cutting blade 24, 24' mutual 1 Since it has 80 ° rotational symmetry, when the pile P is pushed in by rotation, The excavating stress and the cutting stress that occur occur in 180 ° symmetry and work together, Since the same cutting and excavation action occurs in two places at one level position, cutting and excavation of the pile P The action becomes smooth.

【００１７】 そして、各切削羽根２４，２４´も掘進羽根２３，２３´と略同一傾斜角θ２ ４で配置したため、切削羽根の切削掘進作用は地山の撹拌作用を殆ど生ずること なく、円錐ヘッド尖端Ｔでの地山への貫入拡開作用と相俟って、杭Ｐは芯ずれを 抑制した平滑な回転掘進打込みが可能となる。 しかも、杭Ｐ打込み後は、切削羽根２４，２４´が掘進羽根２３，２３´と共 に羽根面での杭支持力を発揮し、杭周面の地山を切り崩さないで掘進したための 杭Ｐ周面の対地山摩擦力と相俟って、建物基礎杭Ｐとしての必要、且つ、十分な 支持力を発揮する。[0017]   And each cutting blade 24, 24 'is also substantially the same inclination angle (theta) 2 as the excavation blade 23, 23'. Since it was arranged in 4, the cutting advancing action of the cutting blade almost causes the stirring action of the natural ground. However, in combination with the action of penetrating and expanding into the natural ground at the tip T of the conical head, the pile P is misaligned. It becomes possible to carry out smooth rotary excavation driving while suppressing.   Moreover, after the pile P is driven, the cutting blades 24 and 24 'share the excavation blades 23 and 23'. In order to demonstrate the pile supporting force on the blade surface and to excavate without breaking the ground around the pile Combined with the friction force against the ground surface of the pile P, it is necessary and sufficient for the building foundation pile P. Demonstrate supportive power.

【００１８】 また、本考案の鋼管杭Ｐにあっては、円筒部２０の外周面に略半周長の２枚の 掘進羽根２３，２３´を回転軸Ｘ−Ｘに対して１８０°回転対称に配置した１対 の掘進羽根を、図３の如く、上下２段に配置するのが好ましい。 この場合は、杭Ｐの掘進作用がより強力、且つ平滑となり、しかも、杭Ｐの打 込み後の掘進羽根による支持力も、４枚の掘進羽根面での支持となり向上する。[0018]   Further, in the steel pipe pile P of the present invention, the outer peripheral surface of the cylindrical portion 20 is made up of two half-circumferential lengths. A pair of digging blades 23 and 23 'arranged 180 ° rotationally symmetrical with respect to the rotation axis XX. It is preferable that the excavation blades of No. 2 are arranged in upper and lower two stages as shown in FIG.   In this case, the digging action of the pile P becomes stronger and smoother, and the pile P is driven. The supporting force by the advancing blades after being incorporated is also improved by being supported by the four advancing blade surfaces.

【００１９】 従って、掘進羽根２３，２３´の傾斜角θ２３を若干大としても、杭Ｐの支持 力は十分となり、掘進羽根傾斜角θ２３を１段配置の場合のそれより大として杭 Ｐの打込み速度の向上をもたらすことが可能となる。 勿論、掘進羽根を２段配置としてその傾斜角θ２３を大とする場合も、切削羽 根２４，２４´に掘進作用＋切削作用を付与するため、切削羽根角θ２４は掘進 羽根角θ２３と同等、若しくはそれ以上とすべきである。[0019]   Therefore, even if the inclination angle θ23 of the excavation blades 23 and 23 'is set to be slightly larger, The force is sufficient, and the excavation blade inclination angle θ23 is set to be larger than that in the case of one step arrangement It is possible to improve the P implantation speed.   Of course, when the excavation blades are arranged in two stages and the inclination angle θ23 is large, the cutting blades The cutting blade angle θ24 is set in order to give the roots 24 and 24 'the excavation effect and the cutting effect. It should be equal to or more than the blade angle θ23.

【００２０】 また、本考案杭Ｐにあっては、頭部２が円筒部２０の基端２Ｂから杭本体１内 への嵌入用の突出胴２２を備え、且つ、基端２Ｂの突出胴周面には適宜間隔で当 接片２５を備えているのが好ましい。 この場合、当接片２５は、図１に示す如く、鋼管１の先端１Ｔの頭部２基端２ Ｂへの当接ストッパーとして作用し、鋼管先端１Ｔと頭部基端２Ｂとの間にスペ ースＳを形成するものであり、各当接片２５が同形態で鋼管先端と当接するのが 好ましい。[0020]   Further, in the pile P of the present invention, the head 2 is located inside the pile main body 1 from the base end 2B of the cylindrical portion 20. Is provided with a protruding barrel 22 for fitting into the protruding barrel, and the protruding barrel circumferential surface of the base end 2B is abutted at appropriate intervals. A contact piece 25 is preferably provided.   In this case, the contact piece 25 is, as shown in FIG. It acts as an abutment stopper for B, and a space is provided between the steel pipe tip 1T and the head base 2B. And the contact pieces 25 contact the steel pipe tip in the same form. preferable.

【００２１】 従って、頭部２の鋼管先端への嵌合は、突出胴２２の嵌入によって容易であり 、当接片２５で形成される幅ａ（当接片突出寸法）の突出胴２２上の間隔Ｓを溶 接用肉盛り代として当接片２５を含む間隔Ｓを杭径Ｄ１と面一に肉盛り溶接する ことにより、頭部２と鋼管１との均斉、且つ強固な溶接が可能となり、本考案鋼 管杭Ｐの製作が容易となる。[0021]   Therefore, fitting of the head 2 to the tip of the steel pipe is easy by fitting the protruding cylinder 22. , The distance S formed by the abutting piece 25 (abutting piece protruding dimension) on the protruding cylinder 22 is melted. The space S including the contact piece 25 is welded to the pile diameter D1 so as to be flush with the pile diameter D1. As a result, the head 2 and the steel pipe 1 can be welded uniformly and firmly. The pipe pile P can be easily manufactured.

【００２２】 また、各当接片２５は、外面が円筒部２０の外周と面一であり、且つ、突出長 ａが同一長であるのが好ましい。 この場合、頭部２の鋳造型組み時に、当接片２５の型枠形成が容易であると共 に、鋳造品としての頭部２は、鋼管先端１Ｔと頭部基端２Ｂとの間に均斉なスペ ースＳを保って鋼管１と嵌合出来、溶接時の間隔Ｓ内への面一の均斉な肉盛り溶 接作業も容易となり、強固な溶接一体化が可能となる。[0022]   The outer surface of each contact piece 25 is flush with the outer periphery of the cylindrical portion 20, and the protruding length is It is preferred that a have the same length.   In this case, it is easy to form a mold for the abutment piece 25 when the head 2 is assembled in the casting mold. In addition, the head 2 as a cast product has a uniform space between the steel pipe tip 1T and the head base 2B. It is possible to fit the steel pipe 1 while maintaining the base S, and evenly weld the surface of the pipe 1 evenly in the space S during welding. Contact work becomes easy, and strong welding integration becomes possible.

【００２３】 また、本考案鋼管杭Ｐにあっては、円筒部２０の外径Ｄ２０が杭本体１の外径 Ｄ１と同径であり、掘進羽根２３，２３´の外径Ｄ２３が杭本体外径Ｄ１の略１ ．５〜２倍径であり、切削羽根２４，２４´の外径Ｄ２４が杭本体外径Ｄ１と同 等かそれ以下であるのが好ましい。[0023]   Further, in the steel pipe pile P of the present invention, the outer diameter D20 of the cylindrical portion 20 is the outer diameter of the pile body 1. It has the same diameter as D1, and the outer diameter D23 of the excavation blades 23, 23 'is approximately 1 of the pile body outer diameter D1. ． The diameter is 5 to 2 times, and the outer diameter D24 of the cutting blades 24, 24 'is the same as the outer diameter D1 of the pile body. It is preferably equal to or less than that.

【００２４】 この場合、円筒部２０の外径Ｄ２０が杭本体外径Ｄ１と同径であることにより 杭Ｐの貫入が平滑となり、掘進羽根２３，２３´は、杭打ち後は支持羽根として 機能するので、外径Ｄ２３が杭本体外径Ｄ１の１．５倍以上あれば十分な支持力 が発揮出来、且つ外径Ｄ２３が鋼管外径Ｄ１の２倍以上であれば掘進回転負荷が 強大となって作業性に問題が生じるため、Ｄ２３＝１．５〜２Ｄ１が作業性及び 杭支持性面から好ましい。[0024]   In this case, the outer diameter D20 of the cylindrical portion 20 is the same as the pile body outer diameter D1. The penetration of the pile P becomes smooth, and the excavation blades 23, 23 'serve as support blades after the pile driving. Since it functions, if the outer diameter D23 is 1.5 times or more the outer diameter D1 of the pile body, sufficient supporting force will be obtained. If the outer diameter D23 is more than twice the outer diameter D1 of the steel pipe, the excavation rotation load is Since it becomes strong and a problem occurs in workability, D23 = 1.5 to 2D1 It is preferable in terms of pile supportability.

【００２５】 また、切削羽根２４，２４´は、円錐ヘッド２１と共に杭先端の地山を切削軟 化させる作用を生じるため、杭本体１の外周部を切削軟化させると杭Ｐの側周面 での対地山摩擦支持力が極端に減少することとなる。 そのため、切削羽根２４，２４´の作用範囲を杭外径Ｄ１内に留めるのが好ま しい。 従って、円筒部外径Ｄ２０、杭本体外径Ｄ１、掘進羽根外径Ｄ２３、切削羽根 外径Ｄ２４を上記条件に設定すれば、合理的な杭回転応力の下に、必要、且つ十 分な支持力を有する基礎杭Ｐの施工が出来る。[0025]   In addition, the cutting blades 24, 24 'together with the conical head 21 softly cut the ground at the tip of the pile. When the outer peripheral portion of the pile main body 1 is softened by cutting, the side peripheral surface of the pile P is generated. The ground bearing frictional bearing capacity at will be extremely reduced.   Therefore, it is preferable to keep the working range of the cutting blades 24, 24 'within the pile outer diameter D1. Good   Therefore, the cylindrical portion outer diameter D20, the pile body outer diameter D1, the excavation blade outer diameter D23, the cutting blade If the outside diameter D24 is set to the above condition, it will be necessary and sufficient under the reasonable pile rotation stress. It is possible to construct a foundation pile P that has sufficient bearing capacity.

【００２６】 また、本考案の基礎杭Ｐにあっては、切削羽根２４，２４´の配置域Ｚ２４が 円錐ヘッド長Ｌ２１の３等分割の略中間域を占める形態に配置するのが好ましい 。 切削羽根２４，２４´を円錐ヘッド２１の中間域内に配置すれば、羽根の傾斜 角θ２４が掘進羽根傾斜角θ２３と近似の緩傾斜であることと相俟って、羽根２ ４，２４´は、基端２４Ｂから先端２４Ｔまで掘進作用に必要な羽根幅を有する 形態に配置出来る。[0026]   Further, in the foundation pile P of the present invention, the arrangement area Z24 of the cutting blades 24, 24 'is The conical head length L21 is preferably arranged so as to occupy a substantially intermediate region of three equal divisions. .   If the cutting blades 24, 24 'are arranged in the intermediate region of the conical head 21, the blade inclination Coupled with the fact that the angle θ24 is a gentle inclination close to the excavation blade inclination angle θ23, the blade 2 4, 24 'have blade widths required for excavation action from the base end 24B to the tip 24T. Can be arranged in a form.

【００２７】 従って、杭Ｐの回転打込み時には、円錐ヘッド２１の尖端Ｔが芯ずれを抑制し た貫入を保証し、円錐ヘッド２１の円錐周面及び切削羽根が杭先端の地山の切削 拡開と推進作用を奏し、掘進羽根２３，２３´が杭Ｐの回転による大きな掘進応 力を発生するため、鋼管基礎杭Ｐは、転石や岩塊の混在する地層でも、杭本体１ の周面の地層を切り崩すことなく、回転力及び押圧力による無振動、無騒音で所 望深度まで打込むことが出来る。 そして、打込んだ杭Ｐは、掘進羽根２３，２３´の羽根面での支持力及び切削 羽根面での支持力と、杭本体１外周面での対地山摩擦力とによって、基礎杭とし ての必要、且つ、十分な支持力を発揮する。[0027]   Therefore, when the pile P is driven into rotation, the tip T of the conical head 21 suppresses misalignment. Of the conical head 21 and the cutting blades to cut the ground at the tip of the pile. It has a widening and propulsion effect, and the excavation blades 23 and 23 'have a large excavation response due to the rotation of the pile P. Since the steel pipe foundation pile P generates a force, the pile main body 1 can be used even in a stratum in which boulders and rock blocks are mixed. Without damaging the stratum around the surface, there is no vibration or noise due to rotational force and pressing force. You can drive to the desired depth.   Then, the driven pile P is used for supporting force and cutting on the blade surfaces of the excavation blades 23, 23 '. Based on the supporting force on the blade surface and the frictional force against the ground on the outer peripheral surface of the pile body 1, a foundation pile is formed. Demonstrate the necessary and sufficient support.

【００２８】 〔実施例（図１、図２）〕 鋼管１は鋼管杭としての市販の外径Ｄ１が１６５．２mm、肉厚５．５mmのもの を採用する。 頭部２は、一般肉厚１０mmの鋳造品であり、円筒部２０の外径Ｄ２０を鋼管１ の外径Ｄ１と同一とし、円筒部長さＬ２０を１００mm、円錐ヘッド２１の長さＬ ２１を１６５．２mmとする。[0028] [Example (FIGS. 1 and 2)]   Steel pipe 1 has a commercially available outer diameter D1 as a steel pipe pile of 165.2 mm and a wall thickness of 5.5 mm To adopt.   The head portion 2 is a cast product having a general wall thickness of 10 mm, and the outer diameter D20 of the cylindrical portion 20 is the steel pipe 1 The outer diameter D1 of the same, the cylindrical portion length L20 is 100 mm, and the conical head 21 has a length L 21 is 165.2 mm.

【００２９】 そして、円筒部２０の外周には、２枚の掘進羽根２３，２３´を、傾斜角θ２ ３が１５°で掘進羽根外径Ｄ２３が２５０mmに、肉厚７mmで各羽根２３，２３´ が半周に亘って軸心（回転中心線）Ｘ−Ｘに１８０°回転対称、即ち、軸心Ｘ− Ｘで１８０°回転させれば回転前と回転後とは掘進羽根２３，２３´が同一形態 で現出する１８０°表裏対称に配置する。[0029]   Then, two cutting blades 23, 23 'are provided on the outer periphery of the cylindrical portion 20 with an inclination angle θ2. 3 is 15 °, the outer diameter D23 of the advancing blade is 250 mm, and the thickness is 7 mm. Is 180 ° rotationally symmetrical with respect to the axis (rotation center line) X-X over a half circumference, that is, the axis X- If rotated 180 ° at X, the advance blades 23, 23 'have the same form before and after rotation. They are arranged symmetrically on the front and back of 180 °.

【００３０】 また、円錐ヘッド２１の外周面にも、図１の如く、肉厚５．５mmの各半周に亘 る切削羽根２４，２４´を傾斜各θ２４が１５°で軸心Ｘ−Ｘに１８０°対称に 、且つ、円錐ヘッド長Ｌ２４を３等分した中間域Ｚ２４内に収まる形態に配置す る。 また、図２に示す如く、頭部２の基端２Ｂからは、突出胴２２を突出長Ｌ２２ が２０mm、径Ｄ２が鋼管１の内部に嵌入密接出来る寸法（１５４mm）に、且つ、 突出胴２２の基端上には９０°間隔で４個の当接片２５を配置する。 尚、各当接片２５は、高さが円筒部２０外周と面一であり、且つ突出長ａを３ mmとする。[0030]   In addition, as shown in FIG. 1, the outer peripheral surface of the conical head 21 extends over each half circumference having a thickness of 5.5 mm. Inclining the cutting blades 24, 24 'with each θ24 of 15 ° and 180 ° symmetry about the axis XX In addition, the conical head length L24 is divided into three equal parts, and the conical head length L24 is placed in the intermediate zone Z24. It   Further, as shown in FIG. 2, from the base end 2B of the head portion 2, the protruding body 22 is provided with a protruding length L22. Is 20 mm, and the diameter D2 is a size (154 mm) that allows it to fit and fit inside the steel pipe 1, and Four contact pieces 25 are arranged on the base end of the projecting barrel 22 at 90 ° intervals.   The height of each contact piece 25 is flush with the outer circumference of the cylindrical portion 20, and the protrusion length a is 3 mm.

【００３１】 上記Ｘ−Ｘ線１８０°回転対称の形状の頭部２を２分割型締めで一体鋳造し、 所定長さを有する鋼管１の先端１Ｔに突出胴２２を密接嵌入し、頭部基端２Ｂと 鋼管先端１Ｔとの間に当接片２５群によって形成される間隔Ｓに肉盛り溶接し、 間隔Ｓを当接片２５と共に溶接によって略面一に仕上げる。[0031]   The head 2 having a rotationally symmetrical X-X-ray 180 ° shape is integrally cast by two-piece mold clamping, The protruding barrel 22 is closely fitted to the tip 1T of the steel pipe 1 having a predetermined length, and the head base 2B Build-up welding is performed at a space S formed by a group of abutting pieces 25 between the steel pipe tip 1T, The space S and the contact piece 25 are welded to be substantially flush.

【００３２】 〔実施例効果〕 本考案杭Ｐの頭部２は、緩傾斜（１５°）の半周長の掘進羽根２３，２３´を 表裏交差形態で外周面に備えた円筒部２０と、緩傾斜（１５°）の半周長の切削 羽根２４，２４´を表裏交差形態で外周面に備えた円錐ヘッド２１、及び円筒部 基端２Ｂから当接片２５を備えた突出胴２２が突出した外形が１８０°回転対称 の複雑な形態ではあるが、１８０°回転対称であるため、鋳造時は、２分割型枠 による型枠組みも脱型も容易となり、鋳造製作が容易である。 また、頭部２の鋼管先端１Ｔへの取付けも、突出胴２２の挿入嵌合と、当接片 ２５による間隔Ｓの形成によって、間隔Ｓを溶接代とした強固な溶接固着が簡単 に実施出来る。[0032] [Effects of Example]   The head 2 of the pile P of the present invention has half-perimeter excavation blades 23, 23 'with a gentle inclination (15 °). Cylindrical part 20 provided on the outer peripheral surface in the form of front and back crossing, and a half-perimeter cutting with a gentle inclination (15 °) Conical head 21 provided with blades 24, 24 'on the outer peripheral surface in a front-back crossing form, and a cylindrical portion The outer shape in which the projecting barrel 22 having the contact piece 25 projects from the base end 2B is 180 ° rotationally symmetrical Although it is a complicated form, it has a 180 ° rotational symmetry, so it is a two-part formwork during casting. The mold framework and the demolding are also easy, and casting production is easy.   Further, the head 2 can be attached to the steel pipe tip 1T by inserting and fitting the protruding barrel 22 into the abutting piece. By forming the interval S by 25, strong welding fixation using the interval S as the welding allowance is easy Can be implemented in

【００３３】 また、掘進羽根２３，２３´及び切削羽根２４，２４´が同一傾斜角（１５° ）の緩傾斜であるため、鋼管杭Ｐの回転押圧による掘進打込み時には、掘進羽根 ２３，２３´が地山を切り崩さないように回転推進させても、切削羽根２４，２ ４´の杭外径Ｄ１の範囲内での地山を切り崩さない状態での地山への切込み推進 と、円錐ヘッド２１の地山への貫入拡開作用とによって、円錐ヘッド２１は地山 を貫通掘進出来、杭Ｐは芯ずれの抑制された状態の下で平滑に、且つ、無振動、 無騒音で所望位置への打込みが可能となる。[0033]   Further, the excavation blades 23, 23 'and the cutting blades 24, 24' have the same inclination angle (15 °). ) Has a gentle inclination, so that when the steel pipe pile P is rotationally pressed, the excavation blade is driven. The cutting blades 24, 2 are rotated and propelled so that 23, 23 'do not cut down the ground. Propulsion of cutting into the ground without breaking the ground within the range of the pile outer diameter D1 of 4 ' And the conical head 21 penetrates and expands into the natural ground, the conical head 21 is Can be pierced through the pile P, and the pile P is smooth and vibration-free under the condition that the misalignment is suppressed, It is possible to drive to a desired position without noise.

【００３４】 そして、鋼管杭Ｐの外周部の地山を切り崩さないために、鋼管杭Ｐの打込終了 後は、掘進羽根２３，２３´は、鋼管径Ｄ１の１．５倍径であって広い羽根面を 有していること、羽根面が緩傾斜（１５°）であることにより十分な杭支持力を 発揮し、切削羽根２４，２４´も緩傾斜（１５°）の羽根面によって円錐ヘッド ２１部での地山支持力を発揮し、鋼管１の外周面での未切削の地山による摩擦力 と相俟って、鋼管杭Ｐは、建物基礎杭としての必要、且つ十分な支持力を発揮す る。[0034]   Then, in order not to cut the ground of the outer peripheral portion of the steel pipe pile P, the driving of the steel pipe pile P is completed. After that, the excavation blades 23, 23 'have a diameter 1.5 times the diameter of the steel pipe D1 and a wide blade surface. Sufficient pile support force due to the fact that the blade surface has a gentle inclination (15 °) The cutting blades 24 and 24 'also have a conical head due to the blade surface with a gentle inclination (15 °). Demonstrate the ground support force in 21 parts, and the frictional force due to uncut ground on the outer peripheral surface of the steel pipe 1. In combination with the above, the steel pipe pile P exhibits a necessary and sufficient supporting force as a building foundation pile. It

【００３５】 しかも、２枚の掘進羽根２３，２３´及び２枚の切削羽根２４，２４´は１８ ０°回転対称の配置であるため、それぞれスパイラル半周ピッチの領域Ｚ２３， Ｚ２４内に半周ピッチ長の羽根を２枚配置出来、地山に対する同一水準での同一 の切削作用及び掘進作用が半周ピッチの狭い領域内で常に１８０°対称に表裏両 側で作用することとなり、強力で均斉、且つスムーズな切削及び掘進作用を奏す る。[0035]   Moreover, the two cutting blades 23, 23 'and the two cutting blades 24, 24' are 18 Due to the 0 ° rotational symmetry arrangement, the regions Z23, Two blades with a half circumference pitch length can be arranged in Z24, and the same level with respect to the ground is the same. The cutting action and excavation action of the front and back sides are always symmetrical 180 ° within a narrow half-circle pitch area. It will work on the side of the machine, providing powerful, uniform, smooth cutting and digging action. It

【００３６】 そして、切削羽根２４，２４´の先端２４Ｔよりもヘッド尖端Ｔが先行し、杭 Ｐがヘッド尖端Ｔを軸心として回転進行出来るため、杭Ｐの回転推進は芯ずれの 生じ難い進行となり、切削羽根２４，２４´による表裏１８０°対称切削作用と 相俟って、硬い地層の切り崩しも可能となり、杭Ｐの切削掘進が強力、且つ、ス ムーズに遂行出来る。[0036]   The head tip T precedes the tips 24T of the cutting blades 24, 24 ', Since P can rotate around the tip T of the head as an axis, the rotational propulsion of the pile P is misaligned. It is a process that does not easily occur, and the cutting blades 24, 24 'have a symmetrical 180 ° front and back cutting action. Together with this, it is possible to cut down hard strata, and the cutting and excavation of the piles P is strong and smooth. You can do it smoothly.

【００３７】 〔変形例（図３）〕 図３の変形例は、実施例（図１）のものに於いて、掘進羽根２３，２３´の一 対を上下２段に配置したものである。 即ち、頭部２の円筒部２０のみを図１のものより長くし、周面のスパイラル１ ピッチ内にスパイラル２ピッチ分の羽根を配置したものである。 従って、実施例のものに比べて、頭部２の単価、即ち杭Ｐの単価は高くなるが 、杭Ｐの推進力及び掘進羽根による杭支持力は向上する。[0037] [Modification (Fig. 3)]   The modification of FIG. 3 is one of the excavation blades 23, 23 'in the embodiment (FIG. 1). The pair is arranged in two stages, upper and lower.   That is, only the cylindrical portion 20 of the head 2 is made longer than that of FIG. The blades for two pitches of spiral are arranged in the pitch.   Therefore, the unit price of the head 2, that is, the unit price of the pile P is higher than that of the embodiment. , The driving force of the pile P and the pile supporting force by the excavation blade are improved.

【００３８】 〔その他〕 実施例（図１）及び変形例（図３）では、切削羽根２４，２４´を１５°の緩 傾斜として、羽根幅も基端２４Ｂから先端２４Ｔまで略同幅タイプとし、掘進羽 根２３，２３´と同じ緩傾斜（１５°）としたが、切削羽根を基端から先端へと 漸増タイプとし、傾斜角θ２４も掘進羽根の傾斜角より若干（５°〜１０°）大 の傾斜角で配置することも可能である。 この場合は、切削羽根の配置領域Ｚ２４は、実施例より長くなり円錐ヘッド２ １の長さＬ２１の３分割中間域より若干広く配置することとなり、羽根面による 杭支持力も低下するが、切削羽根２４，２４´は、掘進羽根角θ２３より傾斜角 θ２４を若干（５°〜１０°）大としたために、羽根面に切込み地山に対する押 圧破砕分力を生ずるため、地山への切込み作用プラス地山破砕作用を奏する。 従って、杭Ｐは、円錐ヘッド尖端Ｔを中心に回転推進し、ヘッド尖端Ｔの貫入 及び円錐周面での地山拡開作用と、切削羽根２４，２４´による地山の切削破砕 作用との協同作用により杭先端での地山の切削力は向上し、硬質地層への打込み に適した杭Ｐとなる。[0038] [Other]   In the embodiment (FIG. 1) and the modification (FIG. 3), the cutting blades 24, 24 ′ are loosened by 15 °. As the inclination, the blade width is also the same width type from the base end 24B to the tip 24T, and The same gentle inclination (15 °) as the roots 23, 23 'was used, but the cutting blade was moved from the base end to the tip. Gradual increase type, and the inclination angle θ24 is slightly (5 ° to 10 °) larger than the inclination angle of the excavation blade. It is also possible to arrange at an inclination angle of.   In this case, the arrangement area Z24 of the cutting blade becomes longer than that in the embodiment, and the conical head 2 It will be arranged a little wider than the three-divided intermediate area of length L21 of 1, depending on the blade surface. Although the pile supporting force is also reduced, the cutting blades 24, 24 'have an inclination angle more than the excavation blade angle θ23. Since θ24 is set to a slightly large value (5 ° to 10 °), the blade surface is cut into Since a crushing force component is generated, it exerts a cutting action on the ground and a ground crushing action.   Therefore, the pile P is rotated and propelled about the conical head tip T, and the penetration of the head tip T occurs. And ground expansion on the conical surface and cutting and crushing the ground by the cutting blades 24, 24 ' The cutting force of the ground at the tip of the pile is improved by the cooperative action with the action, and it is driven into the hard formation. The pile P is suitable for.

【００３９】 また、各切削羽根２４，２４´の先端２４Ｔ、及び掘進羽根２３，２３´の先 端２３Ｔ全幅にテーパーｔ（図２）を付与すれば、地山への喰い込みがよりスム ーズとなる。 また、掘進羽根２３，２３´の外径Ｄ２３は、実施例では鋼管１の外径Ｄ１の １．５倍としたが、羽根幅Ｗ２３での杭支持力を高めるために、本考案の範囲内 で掘進羽根２３，２３´の外径Ｄ２３は必要に応じて大きく出来、鋼管径Ｄ１の ２倍又はそれ以上とすることも可能である。[0039]   Further, the tip 24T of each cutting blade 24, 24 'and the tip of the excavation blade 23, 23' If the taper t (Fig. 2) is applied to the entire width of the end 23T, the bite into the ground is smoother. It becomes   In addition, the outer diameter D23 of the excavation blades 23, 23 'is equal to the outer diameter D1 of the steel pipe 1 in the embodiment. 1.5 times, but within the scope of the present invention in order to increase the pile support force at the blade width W23 The outer diameter D23 of the digging blades 23, 23 'can be increased if necessary, and the outer diameter D23 of the steel pipe diameter D1 It is also possible to double or more.

【００４０】[0040]

【考案の効果】[Effect of device]

円錐ヘッド２１周面には切削羽根２４，２４´を備え、円筒部２０周面には掘 進羽根２３，２３´を備えた頭部２を杭本体１の先端に嵌合固着して切削、掘進 用の杭を形成するため、必要機能を備えた複雑な形態の頭部のみを別体品として 鋳造製作しておき、必要に応じて鋼管に嵌合固着するのみで所望の鋼管基礎杭Ｐ が得られ、鋼管杭Ｐの保管、製作管理が容易となる。   The peripheral surface of the conical head 21 is provided with cutting blades 24, 24 ', and the peripheral surface of the cylindrical portion 20 is dug. The head 2 having the advancing blades 23, 23 'is fitted and fixed to the tip of the pile body 1 for cutting and excavation. In order to form a pile for use as a separate item, only the head with a complicated shape that has the necessary functions The desired steel pipe foundation pile P can be manufactured by casting and then simply fitting and fixing the steel pipe to the steel pipe as required. Thus, the storage and production management of the steel pipe pile P becomes easy.

【００４１】 しかも、それぞれ、略半周長の各切削羽根２４，２４´相互、及び各掘進羽根 ２３，２３´相互を頭部２の外周面上に１８０°回転対称に配置するため、羽根 配置は螺旋１／２ピッチ内に１周長の羽根が配置出来て、短寸の配置域Ｚ２３， Ｚ２４に有効作用長を備えた羽根がコンパクトに配置出来ることと、各切削羽根 及び各掘進羽根が地山の同一水準位置での１８０°回転対称の２個所で作用する こととが相俟って、杭Ｐは、先端の短寸の切削域Ｚ２４及び掘進域Ｚ２３での強 力、且つ平滑な切削及び掘進作用が発揮出来る。[0041]   Moreover, each of the cutting blades 24 and 24 'having a substantially half circumference, and each of the advancing blades, respectively. The blades 23, 23 'are arranged on the outer peripheral surface of the head 2 in 180 ° rotational symmetry, As for the arrangement, the blades of one circumference can be arranged within the spiral 1/2 pitch, and the short arrangement area Z23, Z24 blades with effective working length can be arranged compactly, and each cutting blade And each blade works at two 180 ° rotationally symmetrical positions at the same level on the ground. Combined with this, the pile P has a strong strength in the short cutting zone Z24 at the tip and the excavation zone Z23. It can exert force and smooth cutting and digging action.

【００４２】 更に、緩傾斜の切削羽根は、円錐ヘッドの尖端Ｔでの横ぶれのない回転の下で の地山へのスムーズな切込みと円錐形態による地山拡開作用となり、１８０°回 転対称位置の切削羽根先端２４Ｔの同一レベルの表裏２個所での地山への喰い込 み作用と相俟って、強力、且つ、スムーズな切削及び掘進が可能となる。 そして、杭打込み後は、緩傾斜の切削羽根面は、掘進羽根面と共に杭支持力を 発揮し、杭Ｐ外周面の切り崩されていない地山による杭Ｐ外周面への摩擦力と相 俟って、杭Ｐは建物基礎杭としての必要、且つ十分な支持力を発揮する。[0042]   In addition, the gently sloping cutting blades are provided under sideways rotation at the tip T of the conical head. It makes a smooth incision into the natural ground and the cone expands due to the cone shape, and rotates 180 ° The cutting blade tip 24T at the axisymmetric position bites into the ground at two front and back surfaces at the same level. In combination with the action, it enables powerful and smooth cutting and excavation.   After driving the pile, the gently inclined cutting blade surface, together with the excavation blade surface, increases the pile supporting force. The friction force exerted on the outer peripheral surface of the pile P due to the uncut ground on the outer peripheral surface of the pile P In addition, the pile P exerts a necessary and sufficient supporting force as a building foundation pile.

【００４３】 また、鋼管１に固着する頭部２は、形態が１８０°回転対称であるため、その 複雑な形状も２分割型の型締めによって一体鋳造出来、型組み及び鋳造後の型割 り作業も容易であり、強力な切削力及び掘進力を発揮する鋼管杭が低コストで合 理的に準備出来る。 従って、本考案は、中低層住宅建築の無振動、無騒音、無排土の基礎杭として 、広範囲の地層に有効に適用出来る高性能基礎杭の低コストでの提供を可能とす る、実用性の高い考案である。[0043]   In addition, since the head 2 fixed to the steel pipe 1 has a 180 ° rotational symmetry, Even complex shapes can be integrally cast by two-piece mold clamping, and mold assembly and mold split after casting Work is easy, and steel pipe piles that exert strong cutting and digging power are combined at low cost. Can be prepared reasonably.   Therefore, the present invention can be used as a vibration-free, noise-free and soil-free foundation pile for medium- and low-rise residential buildings. Enables low-cost provision of high-performance foundation piles that can be effectively applied to a wide range of formations It is a highly practical device.

【図面の簡単な説明】[Brief description of drawings]

【図１】本考案実施例の要部外観図である。FIG. 1 is an external view of a main part of an embodiment of the present invention.

【図２】本考案実施例の頭部２の側面図である。FIG. 2 is a side view of the head 2 according to the embodiment of the present invention.

【図３】変形例の側面図である。FIG. 3 is a side view of a modified example.

【図４】従来例１の側面図である。FIG. 4 is a side view of Conventional Example 1.

【図５】従来例２の分解斜視図である。5 is an exploded perspective view of Conventional Example 2. FIG.

【符号の説明】[Explanation of symbols]

１：鋼管（杭本体）、 １Ｔ：鋼管先
端、２：頭部、 ２Ｂ：基端
（頭部基端）、２０：円筒部、
２１：円錐ヘッド、２２：突出胴
２３，２３´：掘進羽根（支持羽根）、２３Ｔ：羽
根先端、 ２４，２４´：切削羽根
（切削刃）、２４Ｂ：基端（羽根基端）、
２４Ｔ：先端（羽根先端）、２５：当接片、
Ｓ：間隔（スペース）、Ｄ１：鋼管外径
（外径）、 Ｄ２０：円筒部外径（外
径）、Ｄ２３：掘進羽根外径（外径）、 Ｄ２
４：切削羽根外径（外径）、Ｚ２３：掘進羽根領域（配
置領域）、 Ｚ２４：切削羽根領域（配置領域）、
Ｐ：鋼管杭（杭）1: Steel pipe (pile main body), 1T: Steel pipe tip, 2: Head, 2B: Base end (head base end), 20: Cylindrical part,
21: conical head, 22: protruding cylinder
23, 23 ': Excavation blade (supporting blade), 23T: Blade tip, 24, 24': Cutting blade (cutting blade), 24B: Base end (blade base end),
24T: tip (tip of blade), 25: contact piece,
S: interval (space), D1: steel pipe outer diameter (outer diameter), D20: cylindrical portion outer diameter (outer diameter), D23: advancing blade outer diameter (outer diameter), D2
4: cutting blade outer diameter (outer diameter), Z23: excavation blade area (arrangement area), Z24: cutting blade area (arrangement area),
P: Steel pipe pile (pile)

Claims (6)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項１】 鋼管から成る杭本体（１）の先端に、円
筒部（２０）及び円錐ヘッド（２１）から成る頭部
（２）を嵌合固着した杭（Ｐ）であって、円筒部（２
０）外周面には略半周長の掘進羽根（２３，２３´）の
２枚を緩傾斜角（θ２３）で、円錐ヘッド（２１）の外
周面には略半周長の切削羽根（２４，２４´）の２枚
を、掘進羽根傾斜角（θ２３）と同角度か、やや大きな
傾斜角（θ２４）で、且つ、各２枚の掘進羽根及び切削
羽根相互を回転中心線（Ｘ−Ｘ）に対して１８０°回転
対称に配置した鋼管基礎杭。1. A pile (P) comprising a pile body (1) made of steel pipe, and a head portion (2) made of a cylindrical portion (20) and a conical head (21) fitted and fixed to the tip of the pile portion (P). (2
0) Two cutting blades (23, 23 ') having a substantially half circumference are provided on the outer peripheral surface at a gentle inclination angle (θ23), and cutting blades (24, 24) having a substantially half circumference are formed on the outer peripheral surface of the conical head (21). ′) At the same angle as the excavation blade inclination angle (θ23) or at a slightly larger inclination angle (θ24), and with each of the two excavation blades and cutting blades as the rotation center line (XX). Steel pipe foundation piles arranged 180 ° rotationally symmetrically. 【請求項２】 請求項１記載の鋼管基礎杭に於いて、２
枚の掘進羽根（２３，２３´）の１対を、上下２段に２
対配置した鋼管基礎杭。2. The steel pipe foundation pile according to claim 1, wherein 2
A pair of excavation blades (23, 23 '), 2 in upper and lower stages
Steel pipe foundation piles arranged in pairs. 【請求項３】 頭部（２）が、円筒部（２０）の基端
（２Ｂ）から杭本体（１）内への嵌入用の突出胴（２
２）を備え、且つ、基端（２Ｂ）の突出胴周面には適宜
間隔で当接片（２５）を備えた請求項１又は２の鋼管基
礎杭。3. The head (2) has a projecting barrel (2) for fitting from the base end (2B) of the cylindrical part (20) into the pile body (1).
The steel pipe foundation pile according to claim 1 or 2, further comprising: 2), and abutment pieces (25) provided at appropriate intervals on the protruding body circumferential surface of the base end (2B). 【請求項４】 各当接片（２５）は、外面が円筒部（２
０）の外面と面一であり、且つ突出長（ａ）が同一であ
る、請求項１乃至３のいずれか１項の鋼管基礎杭。4. The outer surface of each contact piece (25) is a cylindrical portion (2).
The steel pipe foundation pile according to any one of claims 1 to 3, which is flush with the outer surface of (0) and has the same protruding length (a). 【請求項５】 円筒部（２１）の外径（D２０）が杭本
体（１）の外径（Ｄ１）と同径であり、掘進羽根（２
３，２３´）の外径（Ｄ２３）が杭本体外径（Ｄ１）の
略１．５倍〜２倍径であり、切削羽根（２４，２４´）
の外径（Ｄ２４）が杭本体外径（Ｄ１）と同等か、それ
以下である、請求項１乃至４のいずれか１項の鋼管基礎
杭。5. The outer diameter (D20) of the cylindrical portion (21) is the same as the outer diameter (D1) of the pile body (1), and the excavation blade (2)
The outer diameter (D23) of 3,23 ') is approximately 1.5 to 2 times the outer diameter (D1) of the pile body, and the cutting blades (24, 24')
The steel pipe foundation pile according to any one of claims 1 to 4, wherein the outside diameter (D24) is equal to or less than the outside diameter (D1) of the pile body. 【請求項６】 切削羽根（２４，２４´）の配置域（Ｚ
２４）が円錐ヘッド長（Ｌ２１）の３等分割の略中間域
を占めている、請求項１乃至５のいずれか１項の鋼管基
礎杭。6. Arrangement area (Z) of cutting blades (24, 24 ′)
24) The steel pipe foundation pile according to any one of claims 1 to 5, wherein 24) occupies a substantially intermediate region of the conical head length (L21) divided into three equal parts.