JP3712883B2 - Ground improvement pile creation device - Google Patents

Ground improvement pile creation device Download PDF

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JP3712883B2
JP3712883B2 JP06748299A JP6748299A JP3712883B2 JP 3712883 B2 JP3712883 B2 JP 3712883B2 JP 06748299 A JP06748299 A JP 06748299A JP 6748299 A JP6748299 A JP 6748299A JP 3712883 B2 JP3712883 B2 JP 3712883B2
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hollow tube
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JP2000265467A (en
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誠 大塚
修二 磯谷
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不動建設株式会社
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Description

【０００１】
【発明の属する技術分野】
本発明は、例えば、サンドコンパクションパイル工法（ＳＣＰ工法）等に用いて好適な無振動・低騒音式の地盤改良杭造成装置に関する。
【０００２】
【従来の技術】
この種の無振動・低騒音式の地盤改良杭造成装置として、図４に示す特開平８−２８４１４６号公報に開示されたものがある。この無振動・低騒音式の地盤改良杭造成装置としての締め固め砂杭造成装置１は、前面に長尺のリーダー３を立設した施工機本体２を備えている。このリーダー３には、昇降機４とスイーベル機構付きの回動機５を介して長尺の中空管８を回動及び昇降動自在に支持してある。この中空管８の上端は上記スイーベル機構付きの回動機５を介して非回動部６に回動自在に接続され、非回動部６には砂供給用のホッパー７と上記昇降機４の側機構部４ａが設けられている。
【０００３】
昇降機４は中空管８を地盤９中に貫入する時と引き抜く時にリーダー３からの反力が受けられるものであり、例えば、その側機構部４ａに設けられた図示しない駆動機構付きピニオンと該ピニオンに噛合するリーダー３に設けられたラック３ａとから構成されている。尚、中空管８は鋼製で円筒状のケーシングパイプからなり、その下端には地盤９中への該中空管８の貫入を助ける掘削ビット８ａを複数取り付けてある。
【０００４】
そして、この締め固め砂杭造成装置１を用いて、地盤９中に地盤改良杭としての砂杭Ｓを造成する場合には、まず、中空管８を地盤９の地表面９ａ上の所定位置に据え、中空管８を回転させながら地盤９中の所定深さまで貫入する。その後、中空管８の一定長の引き抜きと再貫入（打戻し）を順次地表面９ａに至るまで細かく繰り返す。この間、中空管８の引き抜き工程でホッパー７より中空管８内に投入された砂を該中空管８の下端開口より圧縮空気を使用しながら排出して円柱状に残置させ、中空管８の再貫入工程で上記残置した砂から成る円柱に圧縮力を加えて締め固めると同時に水平方向に押し拡げ、地盤９中に拡径の砂杭Ｓを地表面９ａまで造成する。
【０００５】
尚、この無振動・低騒音式の締め固め砂杭造成装置１に関する類似技術は、特開平６−２００５２０号公報及び特開平９−１５８１６６号公報に開示されている。
【０００６】
【発明が解決しようとする課題】
しかしながら、前記従来の無振動・低騒音式の締め固め砂杭造成装置１では、長尺のリーダー３が必要不可欠なため、装置の全高が非常に高くなり、空港や河川の地盤改良工事で橋梁下等の高さ制限等がある現場では、締め固め砂杭造成装置１の移動や設置作業が煩雑となり、施工時間が長時間かかった。また、長尺のリーダー３の上側に昇降機４及び回動機５が設けられているため、中空管８の貫入時にリーダー３からの反力が不安定となり、硬質地盤の現場では中空管８を原地盤に貫入し難く、中空管８の貫入作業に時間がかかったり、超硬質地盤の現場や転石地盤の現場では施工できなくなる虞があった。
【０００７】
そこで、本発明は、前記した課題を解決すべくなされたものであり、全高を低くすることができると共に、高さ制限等がある現場や硬質地盤の現場でもスムーズに地盤改良工事を行うことができる地盤改良杭造成装置を提供することを目的とする。
【０００８】
【課題を解決するための手段】
請求項１の発明は、装置本体に対して回動及び昇降動自在に支持された中空管を地盤中の所定深さまで貫入した後、前記中空管の一定長の引き抜きと再貫入を順次地表面に至るまで細かく繰り返して、前記中空管の下端開口より排出されて残置された杭材料から成る柱を順次圧縮しながら締め固めて前記地盤中に拡径の地盤改良杭を造成するようにした地盤改良杭造成装置において、前記装置本体に短尺の中空管を回動及び昇降動自在に支持した管回動・圧入引抜機を設けると共に、該装置本体に短尺のバケットエレベータを立設し、かつ前記短尺の中空管の上端にスイーベル機を介して杭材料供給用のホッパーの下端を取り付け、このホッパーと前記短尺のバケットエレベータの先端との間に伸縮自在なジャバラを介在したことを特徴とする。
【０００９】
この地盤改良杭造成装置では、装置本体に短尺の中空管を回動及び昇降動自在に支持した管回動・圧入引抜機を設けると共に、該装置本体に短尺のバケットエレベータを立設し、かつ、短尺の中空管の上端にスイーベル機を介して杭材料供給用のホッパーの下端を取り付け、このホッパーと短尺のバケットエレベータの先端との間に伸縮自在なジャバラを介在したので、装置全体の高さが低くなると共に、高さ制限等がある現場や硬質地盤の現場でもスムーズに地盤改良工事が行われる。
【００１０】
請求項２の発明は、請求項１記載の地盤改良杭造成装置であって、前記地盤に貫入された中空管の上端に、継ぎ足し用の短尺の中空管の下端を連結自在にしたことを特徴とする。
【００１１】
この地盤改良杭造成装置では、地盤に貫入された中空管の上端に、継ぎ足し用の短尺の中空管の下端を連結自在にしたので、地盤の深層まで地盤改良杭が造成される。
【００１２】
請求項３の発明は、請求項１記載の地盤改良杭造成装置であって、前記装置本体の両側にクローラキャリアをそれぞれ設けたことを特徴とする。
【００１３】
この地盤改良杭造成装置では、装置本体の両側にクローラキャリアをそれぞれ設けたので、管回動・圧入引抜機に中空管を支持した起立状態でも施工位置まで地盤改良杭造成装置がスムーズに移動される。
【００１４】
【発明の実施の形態】
以下、本発明の一実施形態を図面に基づいて説明する。
【００１５】
図１は本発明の一実施形態の無振動・低騒音式の締め固め砂杭造成装置を示す側面図、図２は同装置の施工時の側面図、図３（ａ）〜（ｄ）は同装置による砂杭の造成工程を順を追って示す説明図である。
【００１６】
図１，図２に示すように、締め固め砂杭造成装置（地盤改良杭造成装置）１０は、両側にクローラキャリア１２をそれぞれ設けた施工機本体（装置本体）１１を備えている。この施工機本体１１の中央には短尺の中空管１４を回動及び昇降動自在に支持した管回動・圧入引抜機１３を設けてあると共に、該施工機本体１１の前後側にはパワーユニット１５と短尺のバケットエレベータ１６をそれぞれ立設してある。
【００１７】
管回動・圧入引抜機１３は、短尺の中空管１４を回転或いは往復回動させる油圧モータ等から成る管回動駆動部１３ａと、短尺の中空管１４を中央に貫通させると共にチャッキングして下方に押し込んで圧入したり上方に引き抜く管圧入引抜駆動部１３ｂとを備えている。また、バケットエレベータ１６の先端にはジャバラ１７を介して砂供給用のホッパー１８を取り付けてある。この砂供給用のホッパー１８の下端にはスイーベル機１９を介して短尺の中空管１４を回動自在に支持してある。
【００１８】
さらに、ジャバラ１７の先端のホッパー１８上には、短尺の中空管１４内に投入された砂（杭材料）２０の砂面の高さを検知する砂面検知機２１を取り付けてある。また、スイーベル機１９には空気圧縮機２２の圧縮空気供給管２３を接続してある。これにより、短尺の中空管１４に空気圧縮機２２から圧縮空気Ａが供給されてその内部が圧気されるようになっている。この時、外部に圧縮空気Ａが漏れないようにホッパー１８とスイーベル機１９との間には図示しないエアー弁を開閉自在に取り付けてある。
【００１９】
尚、短尺の中空管１４は鋼製で円筒状のケーシングパイプからなり、図２に示すように、地盤９に貫入された短尺の中空管１４の上端１４ａには、着脱用の連結リング２４を介して継ぎ足し用の短尺の中空管１４′の下端１４ｂを連結自在にしてある。また、バケットエレベータ１６の中途部と上部との間にはジャバラ１７を伸縮自在に支持するワイヤロープ２５を掛け渡してある。さらに、バケットエレベータ１６は油圧シリンダ２６により起立傾倒自在になっている。
【００２０】
以上実施形態の締め固め砂杭造成装置１０によれば、地盤９中に地盤改良杭としての砂杭Ｓを造成する場合には、まず、図１に示すように、施工機本体１１をクローラキャリア１２を介して所定の施工位置まで移動させて停止させる。そして、図３（ａ）に示すように、施工機本体１１の管回動・圧入引抜機１３に短尺の中空管１４をセットし、該短尺の中空管１４内にホッパー１８よりポイント砂（中空管１４の下端開口に栓をする砂）２０′を投入する。
【００２１】
次に、図３（ｂ）に示すように、短尺の中空管１４を回転或いは往復回動（左右に揺動）させ、該短尺の中空管１４内にホッパー１８より砂２０を投入しながら地盤９中に該短尺の中空管１４を貫入する。この際に、管全長が不足する場合には地盤９に貫入途中の短尺の中空管１４の地表面９ａより突出した上端１４ａに継ぎ足し用の短尺の中空管１４′の下端１４ｂを連結リング２４を介して連結する。
【００２２】
次に、図３（ｃ）に示すように、短尺の中空管１４を地盤９中の所定深さまで貫入した後、該短尺の中空管１４内に空気圧縮機２２から圧縮空気Ａを供給してその内部を圧気して該短尺の中空管８を回転或いは往復回動させて一定長さ上方に引き抜き、該短尺の中空管１４の下端１４ｂの開口より砂２０を圧縮空気Ａを使用しながら排出して円柱状に残置させる。次に、短尺の中空管１４を再貫入（打戻し）して上記残置した砂２０から成る円柱に圧縮力を加えて締め固める。
【００２３】
そして、図３（ｄ）に示すように、短尺の中空管１４の一定長の引き抜きと再貫入を順次地表面９ａに至るまで細かく繰り返して（ウェーブ施工して）、上記残置した砂２０から成る円柱に圧縮力を加えて締め固めると同時に水平方向に押し拡げ、地盤９中に拡径の砂杭Ｓを地表面９ａまで造成する。この間、管の継ぎ足しがあれば、順次外しながら施工する。
【００２４】
この砂杭２０を造成する締め固め砂杭造成装置１０では、従来の長尺のリーダー３が不要なため、装置全体の高さを低くすることができ、空港や河川の地盤改良工事で橋梁下等の高さ制限等がある現場でも、締め固め砂杭造成装置１０の移動や短尺の中空管１４の設置作業等を簡単に行うことができ、施工時間を短縮することができる。
【００２５】
また、施工機本体１１の中央に短尺の中空管１４を回動及び昇降動させる管回動・圧入引抜機１３を設けているため、中空管１４を支持する重心を低くかつ安定させることができると共に、管回動・圧入引抜機１３による中空管１４の貫入動力を大きくすることができ、原地盤が硬質地盤の現場でも中空管１４を簡単かつ確実に貫入させることができる。これにより、中空管１４の貫入作業の時間を短縮することができ、また、超硬質地盤の現場や転石地盤の現場にも施工することができ、さらに、径の大きい砂杭の造成工事も可能となる。
【００２６】
さらに、地盤９に貫入された短尺の中空管１４の上端１４ａに、継ぎ足し用の短尺の中空管１４′の下端１４ｂを連結自在したので、地盤９の深層まで砂杭Ｓを確実に造成することができる。さらにまた、施工機本体１１の両側にクローラキャリア１２をそれぞれ設けたので、管回動・圧入引抜機１３に短尺の中空管１４を支持した起立状態でも施工位置まで締め固め砂杭造成装置１０をスムーズに移動させることができる。
【００２７】
尚、前記実施形態によれば、地盤改良杭の杭材料として砂を用いたが、杭材料は砂に限られず、砂利や砕石等の砂類似粒状材料及び砂を含めたそれらの混合物等を用いても良い。
【００２８】
【発明の効果】
以上説明したように、請求項１の発明によれば、装置本体に短尺の中空管を回動及び昇降動自在に支持した管回動・圧入引抜機を設けると共に、該装置本体に短尺のバケットエレベータを立設し、かつ、短尺の中空管の上端にスイーベル機を介して杭材料供給用のホッパーの下端を取り付け、このホッパーと短尺のバケットエレベータの先端との間に伸縮自在なジャバラを介在したので、地盤改良杭造成装置の全高を低くすることができると共に、高さ制限等がある現場や硬質地盤の現場でもスムーズに地盤改良工事を行うことができる。
【００２９】
請求項２の発明によれば、地盤に貫入された中空管の上端に、継ぎ足し用の短尺の中空管の下端を連結自在にしたので、地盤の深層まで地盤改良杭を確実に造成することができる。
【００３０】
請求項３の発明によれば、装置本体の両側にクローラキャリアをそれぞれ設けたので、管回動・圧入引抜機に中空管を支持した起立状態でも施工位置まで地盤改良杭造成装置をスムーズに移動させることができる。
【図面の簡単な説明】
【図１】本発明の一実施形態の締め固め砂杭造成装置を示す側面図である。
【図２】上記締め固め砂杭造成装置の施工時の側面図である。
【図３】（ａ）〜（ｄ）は上記締め固め砂杭造成装置による砂杭の造成工程を順を追って示す説明図である。
【図４】従来例の締め固め砂杭造成装置を示す側面図である。
【符号の説明】
９ 地盤
９ａ 地表面
１０ 締め固め砂杭造成装置（地盤改良杭造成装置）
１１ 施工機本体（装置本体）
１２ クローラキャリア
１３ 管回動・圧入引抜機
１４ 短尺の中空管（中空管）
１４′ 継ぎ足し用の短尺の中空管
１４ａ 上端
１４ｂ 下端
２０ 砂（杭材料）
Ｓ 砂杭（地盤改良杭）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration-free and low-noise ground improvement pile building apparatus suitable for use in, for example, a sand compaction pile method (SCP method).
[0002]
[Prior art]
As this kind of vibration-free / low-noise type ground improvement pile building device, there is one disclosed in Japanese Patent Laid-Open No. 8-284146 shown in FIG. A compacted sand pile building device 1 as a vibration-free and low-noise ground improvement pile building device includes a construction machine body 2 in which a long leader 3 is erected on the front surface. A long hollow tube 8 is supported on the reader 3 through a lift 4 and a rotating machine 5 with a swivel mechanism so as to be rotatable and movable up and down. The upper end of the hollow tube 8 is rotatably connected to the non-rotating part 6 via the rotating machine 5 with the swivel mechanism. The non-rotating part 6 has a hopper 7 for supplying sand and the elevator 4. A side mechanism 4a is provided.
[0003]
The elevator 4 receives a reaction force from the leader 3 when the hollow tube 8 is inserted into the ground 9 and pulled out. For example, a pinion with a drive mechanism (not shown) provided on the side mechanism portion 4a and the pinion It is comprised from the rack 3a provided in the leader 3 which meshes | engages with a pinion. The hollow tube 8 is made of a cylindrical casing pipe made of steel, and a plurality of excavation bits 8 a for assisting the penetration of the hollow tube 8 into the ground 9 are attached to the lower end thereof.
[0004]
When the sand pile S as the ground improvement pile is created in the ground 9 using the compacted sand pile creation device 1, first, the hollow pipe 8 is placed at a predetermined position on the ground surface 9 a of the ground 9. Then, the hollow tube 8 is penetrated to a predetermined depth in the ground 9 while rotating. Thereafter, the hollow tube 8 is repeatedly pulled out and re-penetrated (returned) to the ground surface 9a in order. During this time, the sand thrown into the hollow tube 8 from the hopper 7 in the drawing process of the hollow tube 8 is discharged from the lower end opening of the hollow tube 8 using compressed air, and left in a columnar shape. In the re-penetration process of the pipe 8, a compressive force is applied to the cylinder made of the left sand and the cylinder 8 is pressed and expanded at the same time, and a sand pile S having an enlarged diameter is formed in the ground 9 up to the ground surface 9a.
[0005]
Similar techniques relating to the vibrationless / low noise compaction sand pile forming device 1 are disclosed in Japanese Patent Laid-Open Nos. 6-200520 and 9-158166.
[0006]
[Problems to be solved by the invention]
However, in the conventional vibration-free and low-noise compacted sand pile building device 1, since the long leader 3 is indispensable, the total height of the device becomes very high, and the bridge improvement is performed in the ground improvement work of airports and rivers. At the site where there is a height restriction such as lower, the movement and installation work of the compacted sand pile building device 1 became complicated, and it took a long time for construction. Further, since the elevator 4 and the rotating machine 5 are provided on the upper side of the long leader 3, the reaction force from the leader 3 becomes unstable when the hollow pipe 8 penetrates, and the hollow pipe 8 is used on the hard ground. Is difficult to penetrate the ground, and it takes time for the hollow tube 8 to be penetrated, and it may be impossible to perform construction on the super hard ground or on the boulder ground.
[0007]
Therefore, the present invention has been made to solve the above-described problems, and can reduce the overall height, and can smoothly perform ground improvement work even at a site where there is a height restriction or a hard ground site. An object of the present invention is to provide a ground improvement pile construction device that can be used.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, the hollow tube supported so as to be rotatable and movable up and down with respect to the apparatus main body is penetrated to a predetermined depth in the ground, and then the hollow tube is successively pulled out and re-penetrated. Repeating finely until reaching the ground surface, the pillar made of pile material discharged and left from the lower end opening of the hollow tube is sequentially compressed and compacted to form a ground-improved pile with expanded diameter in the ground in the soil improvement pile reclamation apparatus, the apparatus main body to short hollow tube rotation and elevation movably supported by tube rotating-pressed extraction machine provided Rutotomoni, a short bucket elevator to the apparatus main body stand The lower end of the pile material supply hopper is attached to the upper end of the short hollow tube via a swivel machine, and a telescopic bellows is interposed between the hopper and the tip of the short bucket elevator . It is characterized by .
[0009]
In this ground improvement pile building device, a tube rotating / press-fit pulling machine that supports a short hollow tube to freely rotate and move up and down is provided in the device main body, and a short bucket elevator is erected on the device main body, In addition, the lower end of the pile material supply hopper is attached to the upper end of the short hollow tube via a swivel machine, and a telescopic bellows is interposed between this hopper and the tip of the short bucket elevator, so the entire device As the height of the ground becomes lower, the ground improvement work is smoothly carried out even on the site where the height is restricted or the site of the hard ground.
[0010]
A second aspect of the present invention, there is provided a soil improvement pile Construction apparatus according to claim 1, wherein the upper end of the hollow tube is penetrating into the ground, that is freely connected to the lower end of the hollow tube short for shirttail It is characterized by.
[0011]
This soil improvement pile reclamation apparatus, the upper end of the hollow tube is penetrating into the ground, since the universal connecting the lower end of the hollow tube short for replenishment, soil improvement pile is Construction deep layer of the ground.
[0012]
The invention of claim 3 is the ground improvement pile building apparatus according to claim 1, characterized in that crawler carriers are provided on both sides of the apparatus main body.
[0013]
In this ground improvement pile creation device, crawler carriers were provided on both sides of the device body, so the ground improvement pile creation device moved smoothly to the construction position even in the standing state where the hollow tube was supported by the tube rotation / press-fit puller Is done.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0015]
FIG. 1 is a side view showing a vibration-free and low-noise compacted sand pile building apparatus according to an embodiment of the present invention, FIG. 2 is a side view when the apparatus is constructed, and FIGS. It is explanatory drawing which shows the creation process of the sand pile by the apparatus later on.
[0016]
As shown in FIGS. 1 and 2, a compacted sand pile building device (ground improvement pile building device) 10 includes a construction machine body (device body) 11 provided with a crawler carrier 12 on each side. At the center of the construction machine main body 11 is provided a tube turning / press-fit pulling machine 13 which supports a short hollow tube 14 so as to be rotatable and movable up and down, and a power unit is provided on the front and rear sides of the construction machine main body 11. 15 and a short bucket elevator 16 are erected.
[0017]
The tube rotation / press-fit drawing / removing machine 13 includes a tube rotation drive unit 13a composed of a hydraulic motor or the like for rotating or reciprocatingly rotating a short hollow tube 14 and a short hollow tube 14 in the center and chucking. And a pipe press-in / pull-out drive unit 13b that is pressed down and press-fitted or pulled up. A sand hopper 18 is attached to the tip of the bucket elevator 16 via a bellows 17. A short hollow tube 14 is rotatably supported at the lower end of the sand supply hopper 18 via a swivel machine 19.
[0018]
Further, on the hopper 18 at the tip of the bellows 17, a sand surface detector 21 for detecting the height of the sand surface of the sand (pile material) 20 put into the short hollow tube 14 is attached. Further, a compressed air supply pipe 23 of an air compressor 22 is connected to the swivel machine 19. Thereby, the compressed air A is supplied from the air compressor 22 to the short hollow tube 14, and the inside thereof is pressurized. At this time, an air valve (not shown) is attached between the hopper 18 and the swivel machine 19 so that the compressed air A does not leak outside.
[0019]
The short hollow tube 14 is made of steel and is formed of a cylindrical casing pipe. As shown in FIG. 2, a detachable connecting ring is attached to the upper end 14 a of the short hollow tube 14 penetrating into the ground 9. 24, the lower end 14b of the short hollow tube 14 'for addition is made connectable. Further, a wire rope 25 that stretchably supports the bellows 17 is stretched between the middle part and the upper part of the bucket elevator 16. Further, the bucket elevator 16 can be tilted up and down by a hydraulic cylinder 26.
[0020]
According to the compacted sand pile forming apparatus 10 of the above embodiment, when the sand pile S as the ground improvement pile is created in the ground 9, first, as shown in FIG. 12 is moved to a predetermined construction position via 12 and stopped. Then, as shown in FIG. 3 (a), a short hollow tube 14 is set on the tube rotation / press-fit puller 13 of the construction machine main body 11, and the point sand is placed in the short hollow tube 14 from the hopper 18. (Sand that plugs the lower end opening of the hollow tube 14) 20 'is charged.
[0021]
Next, as shown in FIG. 3 (b), the short hollow tube 14 is rotated or reciprocated (swung left and right), and sand 20 is put into the short hollow tube 14 from the hopper 18. However, the short hollow tube 14 penetrates into the ground 9. At this time, if the total length of the tube is insufficient, the lower end 14b of the short hollow tube 14 'for addition is connected to the upper end 14a projecting from the ground surface 9a of the short hollow tube 14 in the middle of penetration into the ground 9. 24 is connected.
[0022]
Next, as shown in FIG. 3 (c), the short hollow tube 14 is penetrated to a predetermined depth in the ground 9, and then compressed air A is supplied into the short hollow tube 14 from the air compressor 22. Then, the inside of the short hollow tube 8 is rotated or reciprocally rotated to be pulled upward by a predetermined length, and the compressed air A is removed from the opening of the lower end 14b of the short hollow tube 14 with the compressed air A. Eject it while using it and leave it in a cylindrical shape. Next, the short hollow tube 14 is re-penetrated (returned), and a compression force is applied to the cylinder made of the left sand 20 to be compacted.
[0023]
And as shown in FIG.3 (d), the fixed length extraction and re-penetration of the short hollow tube 14 are repeated finely until it reaches the ground surface 9a one after another (wave construction), from the left sand 20 A compression force is applied to the cylinder to be compacted, and at the same time, the cylinder is pushed and expanded in the horizontal direction, and a sand pile S having an enlarged diameter is formed in the ground 9 up to the ground surface 9a. During this time, if there is any additional pipe, it will be removed while being installed.
[0024]
In the compacted sand pile forming device 10 for forming the sand pile 20, since the conventional long leader 3 is not required, the height of the entire device can be lowered, and the ground improvement work for the airport or river can be performed under the bridge. Even on the site where there is a height restriction such as the above, it is possible to easily perform the movement of the compacted sand pile forming device 10 and the installation work of the short hollow tube 14, and the construction time can be shortened.
[0025]
In addition, since the tube rotation / press-fit pulling machine 13 that rotates and moves the short hollow tube 14 in the center of the construction machine main body 11 is provided, the center of gravity supporting the hollow tube 14 is lowered and stabilized. In addition, it is possible to increase the penetration power of the hollow tube 14 by the tube turning / press-fitting / pulling machine 13, and the hollow tube 14 can be easily and reliably penetrated even when the original ground is a hard ground. As a result, it is possible to reduce the time required for the penetration of the hollow tube 14, and it can also be applied to the site of super hard ground and the site of rolling stone, and also to construct a sand pile with a large diameter. It becomes possible.
[0026]
Further, since the lower end 14b of the short hollow tube 14 'for addition is freely connectable to the upper end 14a of the short hollow tube 14 penetrating into the ground 9, the sand pile S is reliably formed to the deep layer of the ground 9. can do. Furthermore, since the crawler carriers 12 are provided on both sides of the construction machine main body 11, the sand pile forming apparatus 10 is compacted to the construction position even in a standing state in which a short hollow tube 14 is supported on the pipe rotation / press-fit pulling machine 13. Can be moved smoothly.
[0027]
In addition, according to the said embodiment, although sand was used as a pile material of a ground improvement pile, pile materials are not restricted to sand, and those mixtures containing sand, such as gravel and crushed stone, and sand, etc. are used. May be.
[0028]
【The invention's effect】
As described above, according to the first aspect of the present invention, the apparatus main body is provided with the tube rotation / press-fit puller that supports the short hollow tube so as to be rotatable and movable up and down , and the apparatus main body has a short length. A bucket elevator is erected, and the lower end of a hopper for supplying pile material is attached to the upper end of a short hollow tube via a swivel machine. Having interposed, it is possible to reduce the overall height of the soil improvement pile reclamation device can smoothly be performed ground improvement work also at the scene of the scene or a hard ground there is a height restriction and the like.
[0029]
According to the invention of claim 2, the upper end of the hollow tube is penetrating into the ground, since the universal connecting lower ends of the short hollow tube for replenishment, to reliably construct a ground improvement pile deep layer of ground be able to.
[0030]
According to the invention of claim 3, since the crawler carriers are respectively provided on both sides of the apparatus main body, the ground improvement pile building apparatus can be smoothly moved to the construction position even in the standing state in which the hollow pipe is supported by the pipe rotation / press-fit puller. Can be moved.
[Brief description of the drawings]
FIG. 1 is a side view showing a compacted sand pile forming apparatus according to an embodiment of the present invention.
FIG. 2 is a side view at the time of construction of the compacted sand pile forming device.
FIGS. 3A to 3D are explanatory views sequentially illustrating a sand pile creation process by the compacted sand pile creation device. FIG.
FIG. 4 is a side view showing a conventional compacted sand pile forming apparatus.
[Explanation of symbols]
9 Ground 9a Ground surface 10 Compacted sand pile creation device (Ground improvement pile creation device)
11 Construction machine body (device body)
12 Crawler Carrier 13 Tube Rotation / Press-fit Pulling Machine 14 Short Hollow Tube (Hollow Tube)
14 'Short hollow tube for extension 14a Upper end 14b Lower end 20 Sand (pile material)
S Sand pile (Ground improvement pile)

Claims (3)

装置本体に対して回動及び昇降動自在に支持された中空管を地盤中の所定深さまで貫入した後、前記中空管の一定長の引き抜きと再貫入を順次地表面に至るまで細かく繰り返して、前記中空管の下端開口より排出されて残置された杭材料から成る柱を順次圧縮しながら締め固めて前記地盤中に拡径の地盤改良杭を造成するようにした地盤改良杭造成装置において、
前記装置本体に短尺の中空管を回動及び昇降動自在に支持した管回動・圧入引抜機を設けると共に、該装置本体に短尺のバケットエレベータを立設し、かつ前記短尺の中空管の上端にスイーベル機を介して杭材料供給用のホッパーの下端を取り付け、このホッパーと前記短尺のバケットエレベータの先端との間に伸縮自在なジャバラを介在したことを特徴とする地盤改良杭造成装置。After a hollow tube supported so as to be able to rotate and move up and down with respect to the main body of the device is penetrated to a predetermined depth in the ground, a predetermined length of the hollow tube is pulled out and re-penetrated successively until it reaches the ground surface. In addition, a ground improved pile building device that creates a ground improved pile with a larger diameter in the ground by sequentially compressing and compacting columns made of pile material discharged and left from the lower end opening of the hollow tube In
The apparatus main body to short hollow tube rotation and elevation movably supported by tube rotating-pressed extraction machine provided Rutotomoni, erected a short bucket elevator to the apparatus main body, and a hollow of the short Pile material supply hopper lower end is attached to the upper end of the pipe via a swivel machine, and a stretchable bellows is interposed between the hopper and the tip of the short bucket elevator. apparatus. 請求項１記載の地盤改良杭造成装置であって、
前記地盤に貫入された中空管の上端に、継ぎ足し用の短尺の中空管の下端を連結自在にしたことを特徴とする地盤改良杭造成装置。A ground improvement pile creation device according to claim 1,
A ground improvement pile building apparatus characterized in that a lower end of a short hollow pipe for addition can be connected to an upper end of a hollow pipe penetrating into the ground. 請求項１記載の地盤改良杭造成装置であって、
前記装置本体の両側にクローラキャリアをそれぞれ設けたことを特徴とする地盤改良杭造成装置。A ground improvement pile creation device according to claim 1,
A ground improvement pile creation device, wherein crawler carriers are provided on both sides of the device main body, respectively.
JP06748299A 1999-03-12 1999-03-12 Ground improvement pile creation device Expired - Fee Related JP3712883B2 (en)

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JP2681824B2 (en) * 1989-04-28 1997-11-26 不動建設株式会社 Quality control method in ground improvement pile construction method
JP2744998B2 (en) * 1991-09-07 1998-04-28 川鉄テクノコンストラクション株式会社 Rotary pile press-in and pull-out device
JP2879314B2 (en) * 1995-04-19 1999-04-05 不動建設株式会社 Vibration-free and noise-free compacted sand pile construction method
JPH093893A (en) * 1995-06-22 1997-01-07 Yoshio Tanaka Chucking device for pile in device for driving and pulling rotary type pile
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