JP2003119767A - Hollow pipe for creating sand pile and circular sand pile creating method - Google Patents
Hollow pipe for creating sand pile and circular sand pile creating methodInfo
- Publication number
- JP2003119767A JP2003119767A JP2001316450A JP2001316450A JP2003119767A JP 2003119767 A JP2003119767 A JP 2003119767A JP 2001316450 A JP2001316450 A JP 2001316450A JP 2001316450 A JP2001316450 A JP 2001316450A JP 2003119767 A JP2003119767 A JP 2003119767A
- Authority
- JP
- Japan
- Prior art keywords
- sand pile
- hollow pipe
- sand
- hollow tube
- creating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、緩い砂地盤や軟弱
な粘土地盤などの地盤中に円形断面の砂杭を低騒音、低
振動で施工することができる円形砂杭造成工法及びこれ
に用いる砂杭造成装置コストの低減が可能な砂杭造成用
中空管に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a circular sand pile and a method for constructing a sand pile having a circular cross section in the ground such as a loose sand ground or a soft clay ground with low noise and low vibration. The present invention relates to a sand pile forming hollow tube capable of reducing the cost of the sand pile forming apparatus.
【０００２】[0002]
【従来の技術】砂地盤などの軟弱地盤中に砂杭を打設す
ることにより、地盤を改良する地盤改良杭造成工法があ
る。この地盤改良杭造成工法としては、例えば、円筒状
中空管を所定の深度まで貫入した後、該中空管を適宜の
長さ引き抜く工程と該中空管を再貫入する工程とを順
次、地表に至るまで繰り返して、軟弱地盤中に締固め砂
杭を造成する締固め砂杭造成工法などがある。2. Description of the Related Art There is a ground improvement pile construction method for improving the ground by placing sand piles in soft ground such as sand ground. As the ground improvement pile construction method, for example, after the cylindrical hollow tube is penetrated to a predetermined depth, a step of pulling out the hollow tube to an appropriate length and a step of re-penetrating the hollow tube are sequentially performed, There is a compaction sand pile construction method that repeatedly constructs compaction sand piles in soft ground until reaching the ground surface.
【０００３】締固め砂杭造成工法は中空管の引き抜き
時、抜き跡に中空管内の砂を排出し、該排出されたばか
りの砂で形成された比較的緩い砂柱を中空管の再貫入時
に周辺の原地盤の拘束により圧縮し、砂柱と共に、周辺
の原地盤をも締め固める方法である。このため、中空管
は原地盤と緊密に接触しつつ地中に貫入されることが好
ましいが、摩擦抵抗により、貫入抵抗が増大するという
問題がある。これを解決するものとして、螺旋羽根が付
けられていないケーシングを用い、該ケーシングを回動
させて地盤との摩擦を切りながら、貫入時と引き抜き時
にリーダーからの反力が得られるケーシング昇降装置で
ケーシングの貫入と引き抜きを行う無振動、無騒音締固
め砂杭造成工法が開示されている（特開平８−２８４１
４６号公報）。また、回転装置を設置し、円筒状中空管
に回転を与えつつ貫入する方法も知られている。In the compaction sand pile construction method, when the hollow pipe is drawn out, the sand in the hollow pipe is discharged at the extraction mark, and the relatively loose sand column formed by the just discharged sand is re-penetrated into the hollow pipe. It is a method of sometimes compressing by constraining the surrounding ground to consolidate the surrounding ground together with the sand pillar. For this reason, it is preferable that the hollow tube penetrates into the ground while making close contact with the original ground, but there is a problem that the penetration resistance increases due to frictional resistance. As a solution to this problem, a casing lifting device that uses a casing without spiral blades and rotates the casing to reduce friction with the ground while obtaining reaction force from the leader during penetration and extraction A vibration-free and noise-free compaction sand pile construction method for inserting and pulling out a casing is disclosed (Japanese Patent Laid-Open No. 8-2841).
No. 46). A method is also known in which a rotating device is installed and a cylindrical hollow tube is inserted while being rotated.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、前記無
振動、無騒音締固め砂杭造成工法においては、ケーシン
グ形態やケーシング回動装置の具体例が記載されていな
い。また、回転駆動装置を備える砂杭造成装置は電動モ
ーターやスイベル装置が必要であり、設備費が嵩むとい
う問題がある。However, in the vibration-free and noise-free compaction sand pile construction method, no concrete example of the casing form or casing rotating device is described. In addition, the sand pile forming device equipped with the rotation driving device requires an electric motor and a swivel device, which causes a problem that the equipment cost increases.
【０００５】従って、本発明の目的は、振動や騒音を極
力抑制することができると共に、電動モーターやスイベ
ル装置を省略することができ、設備費のコスト上昇を抑
制した砂杭造成用中空管及び円形砂杭造成工法を提供す
ることにある。Therefore, the object of the present invention is to suppress the vibration and noise as much as possible, and to omit the electric motor and the swivel device, and to suppress the increase of the equipment cost. And to provide a round sand pile construction method.
【０００６】[0006]
【課題を解決するための手段】かかる実情において、本
発明者らは鋭意検討を行った結果、特定の先端形状を有
する円筒状中空管を往復回動操作により貫入など行え
ば、振動や騒音を極力抑制することができると共に、該
中空管を備える砂杭造成装置において、電動モーターや
スイベル装置を省略することができ、設備費のコストの
上昇を抑制することができることなどを見出し、本発明
を完成するに至った。Under the circumstances, the inventors of the present invention have made earnest studies, and as a result, vibrations and noise are caused when a cylindrical hollow tube having a specific tip shape is penetrated by reciprocating rotation operation. In the sand pile forming device equipped with the hollow tube, the electric motor and the swivel device can be omitted, and it is possible to suppress an increase in the cost of equipment, and the like. The invention was completed.
【０００７】すなわち、本発明（１）は、砂杭材料が投
入される円筒状中空管と、該中空管の先端部の少なくと
も左右両側に付設され、各先端が該円筒状中空管の中心
からそれぞれ等距離にある突起部とを備え、該突起部の
断面形状が、略三角形状であって、往復回動操作によ
り、地中に円形断面の砂杭を造成するものである砂杭造
成用中空管を提供するものである。That is, according to the present invention (1), a cylindrical hollow tube into which a sand pile material is charged and at least left and right sides of a tip portion of the hollow tube are provided, and each tip has the cylindrical hollow tube. And a projection part that is equidistant from the center of the sand, the cross-sectional shape of the projection part is substantially triangular, and a sand pile having a circular cross section is formed in the ground by reciprocating rotation operation. A hollow pipe for pile construction is provided.
【０００８】また、本発明（２）は、前記（１）の砂杭
造成用中空管の所定深度までの貫入工程、その所定深度
位置での往復回動操作工程、引き抜きによる砂杭材料の
排出工程、往復回動操作による再貫入工程の各工程を地
表まで順次繰り返して行い、地中に円形断面の砂杭を造
成する砂杭造成工法を提供するものである。Further, the present invention (2) provides the step of penetrating the hollow pipe for sand pile construction of the above (1) to a predetermined depth, the reciprocating rotation operation step at the predetermined depth position, and the sand pile material by pulling out. It is intended to provide a sand pile construction method in which a discharge step and a re-penetration step by a reciprocating turning operation are sequentially repeated up to the surface of the earth to form a sand pile with a circular cross section in the ground.
【０００９】[0009]
【発明の実施の形態】次に、本発明の実施の形態におけ
る砂杭造成用中空管及びこれを用いた円形砂杭造成工法
を図１〜図６を参照して説明する。図１は本例の砂杭造
成用中空管の正面図、図２は図１の平面図、図３は中空
管往復回動装置の平面図、図４は中空管往復回動装置の
一部を破断して示す正面図、図５は本例の砂杭造成用中
空管を装着した砂杭造成装置の概略図、図６は図１及び
図２の砂杭造成用中空管を用いて造成される砂杭の円形
断面形状図をそれぞれ示す。BEST MODE FOR CARRYING OUT THE INVENTION Next, a hollow pipe for sand pile construction and a circular sand pile construction method using the hollow pipe according to an embodiment of the present invention will be described with reference to FIGS. 1 is a front view of a hollow pipe for sand pile construction according to this embodiment, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a plan view of a hollow pipe reciprocating rotating device, and FIG. 4 is a hollow pipe reciprocating rotating device. 5 is a front view showing a part of the sand pile is broken away, FIG. 5 is a schematic view of a sand pile building apparatus equipped with the hollow tube for sand pile building of this example, and FIG. 6 is a hollow for sand pile building of FIGS. 1 and 2. The circular cross-sectional shape diagrams of sand piles constructed using pipes are shown respectively.
【００１０】図１および図２において、砂杭造成用中空
管４は、砂杭材料が投入される円筒状中空管１と、該中
空管１の先端部の左右両側及び前後両側に付設され、各
先端２１ａ、２１ｂ、２１ｃ、２１ｄが円筒状中空管１
の中心からそれぞれ等距離Ｒにある複数の突起部２ａ、
２ｂ、２ｃ、２ｄとを備え、各突起部の断面形状が略三
角形状であり、砂杭造成用中空管４の往復回動操作によ
り、地中に円形断面の砂杭を造成するものである。本発
明において、突出部２ａ〜２ｄの略三角形状の先端２１
ａ〜２１ｄは丸みがあってもよい。このように、中空管
１の先端周りに９０度毎に突起部を設け、該中空管１を
回動範囲９０度で往復回動させれば、半径Ｒ内にある原
地盤は半径Ｒの外側に追い出される。また、突出部２ａ
〜２ｄの上面は天板２２ａ〜２２ｄが設置され、円筒状
中空管１との接合を強固にすると共に、締固めの際、原
位置土の抜けを防止している。突起部２ａ〜２ｄの高さ
Ｈは、引き抜きストローク分に相当する長さ、すなわ
ち、１回の引き抜きによる砂杭長であり、地盤の土質、
改良目的により適宜決定される。突起部２ａ〜２ｄは、
長さＨのＶ字型鉄材を円筒状中空管１の所定の位置に溶
接し、更に天板２２ａ〜２２ｄをＶ字型鉄材と円筒状中
空管１とに溶接することにより形成させればよい。ま
た、円筒状中空管１の先端外周面であって、突起部の内
側部分には、該先端部から下方に突出する掘削ビット３
ａ〜３ｄを設置し、砂杭造成用中空管４の地中貫入を容
易にしている。In FIGS. 1 and 2, a sand pile forming hollow tube 4 includes a hollow cylindrical tube 1 into which a sand pile material is charged, and the left and right sides and front and rear sides of the tip of the hollow tube 1. A cylindrical hollow tube 1 attached with each tip 21a, 21b, 21c, 21d.
A plurality of protrusions 2a that are equidistant from the center of
2b, 2c, 2d, the cross-sectional shape of each protrusion is substantially triangular, and a sand pile having a circular cross section is formed in the ground by reciprocating rotation operation of the hollow pipe 4 for sand pile formation. is there. In the present invention, the substantially triangular tips 21 of the protrusions 2a to 2d are provided.
The a to 21d may have roundness. As described above, when the protrusions are provided around the tip of the hollow tube 1 at every 90 degrees and the hollow tube 1 is reciprocally rotated in the rotation range of 90 degrees, the original ground within the radius R is the radius R. Be kicked out of. Also, the protruding portion 2a
Top plates 22a to 22d are installed on the upper surfaces of 2d to 2d to strengthen the joint with the cylindrical hollow tube 1 and prevent the in-situ soil from coming off during compaction. The height H of the protrusions 2a to 2d is a length corresponding to the extraction stroke, that is, the length of the sand pile by one extraction, and the soil quality of the ground,
It is appropriately determined according to the purpose of improvement. The protrusions 2a to 2d are
It is formed by welding a V-shaped iron material having a length H to a predetermined position of the cylindrical hollow tube 1 and further welding the top plates 22a to 22d to the V-shaped iron material and the cylindrical hollow tube 1. Good. Further, on the outer peripheral surface of the tip of the cylindrical hollow tube 1 and on the inner side of the protrusion, the excavation bit 3 protruding downward from the tip is provided.
a to 3d are installed to facilitate the underground penetration of the hollow pipe 4 for sand pile formation.
【００１１】本例の砂杭造成用中空管４は、往復回動操
作により、地中に円形断面の砂杭を造成するものであ
る。砂杭造成用中空管往復回動装置としては、特に制限
されず、電動機と歯車により行う機械式回動装置や、油
圧式回動装置が挙げられる。油圧式回動装置としては、
図３及び図４に示すものが例示される。すなわち、中空
管往復回動装置１０はリーダー１２とは反対側から中空
管１を両側から挟むように付設される一対の油圧シリン
ダー１５を用いて中空管１を往復回動（図３中の矢印方
向）させて地盤との摩擦を切りながら、貫入等を行う装
置である。The sand pile forming hollow tube 4 of the present example is to make a sand pile having a circular cross section in the ground by reciprocating and rotating operation. The hollow pipe reciprocating rotating device for sand pile formation is not particularly limited, and examples thereof include a mechanical rotating device that uses an electric motor and gears, and a hydraulic rotating device. As a hydraulic turning device,
The ones shown in FIGS. 3 and 4 are exemplified. That is, the hollow tube reciprocating / rotating device 10 reciprocally rotates the hollow tube 1 by using a pair of hydraulic cylinders 15 attached so as to sandwich the hollow tube 1 from both sides (FIG. It is a device that penetrates while cutting the friction with the ground by making it the direction of the arrow).
【００１２】中空管往復回動装置１０は、リーダー１２
に沿って昇降するリーダーガイド部１３と、リーダーガ
イド部１３のリーダー１２とは反対側に固定され、中空
管１の往復回動の動きに規制されない固定部１６と、ピ
ストンロッド５２の先端部を中空管１の両側面に付設さ
れるピストンロッド軸支部１７に取り付け、シリンダー
部５１を固定部１６のシリンダー軸支部６１に取り付
け、中空管１をリーダー１２とは反対側から挟むよう
に、且つリーダーガイド部１３の鉛直方向における中央
位置にくるように取り付けられる一対の油圧シリンダー
１５とを備える。The hollow tube reciprocating and rotating device 10 includes a reader 12
A leader guide portion 13 that moves up and down along a fixed portion 16 that is fixed to the opposite side of the leader guide portion 13 from the leader 12 and is not restricted by the reciprocating movement of the hollow tube 1, and the tip end portion of the piston rod 52. Is attached to the piston rod shaft supporting portion 17 attached to both side surfaces of the hollow tube 1, the cylinder portion 51 is mounted to the cylinder shaft supporting portion 61 of the fixed portion 16, and the hollow pipe 1 is sandwiched from the side opposite to the reader 12. And a pair of hydraulic cylinders 15 mounted so as to come to the central position in the vertical direction of the leader guide portion 13.
【００１３】固定部１６は、リーダーガイド１３に固定
される上下一対の中空状円盤部材１８と、一対の中空状
円盤部材１８の該リーダー１２とは反対側の端部１１１
に固定され、シリンダー軸支部６１を有する縦部材６２
とからなり、全体は側面視、略コ字状をなしている。中
空状円盤部材１８は縦部材６２をリーダーガイド部１３
に一体的に固定するための中間部材である。このため、
中空状円盤部材１８の内径を中空管１の外径より大きく
し、ベアリング１９を介在させて、中空状円盤部材の中
空部を貫通する中空管１の往復回動の動きに規制されな
いようにしている。縦部材６は略コ字状であり、縦部材
本体部６２１の左右両側面の鉛直方向中央には、油圧シ
リンダーのシリンダー部５１に固設される縦軸５５を水
平方向において回転自在に軸支するためのシリンダー軸
支部６１を設けている。The fixed portion 16 has a pair of upper and lower hollow disc members 18 fixed to the leader guide 13, and ends 111 of the pair of hollow disc members 18 opposite to the leader 12.
A vertical member 62 fixed to the
It consists of and, and the whole has a substantially U shape in side view. The hollow disc member 18 includes the vertical member 62 and the leader guide portion 13.
It is an intermediate member for integrally fixing to. For this reason,
The inner diameter of the hollow disk member 18 is made larger than the outer diameter of the hollow tube 1, and a bearing 19 is interposed so as not to be restricted by the reciprocating movement of the hollow tube 1 penetrating the hollow portion of the hollow disk member. I have to. The vertical member 6 is substantially U-shaped, and a vertical axis 55 fixed to the cylinder portion 51 of the hydraulic cylinder is rotatably supported in the horizontal direction at the vertical center of the left and right side surfaces of the vertical member main body portion 621. A cylinder shaft support portion 61 is provided for this purpose.
【００１４】油圧シリンダー１５は、シリンダー部５１
とピストンロッド５２とからなり、シリンダー部５１に
は固定部のシリンダー軸支部６１に水平方向において回
動自在に取り付けられる。油圧シリンダー１５は中空管
１と固定部１６に取り付けた状態において、油圧シリン
ダー５が水平位置を保つと共に、リーダーガイド３の鉛
直方向における中央位置にくるようにすると、外力のリ
ーダー１２への伝達が効率的に行われる点で好適であ
る。The hydraulic cylinder 15 has a cylinder portion 51.
And a piston rod 52, and is attached to the cylinder portion 51 on a cylinder shaft support portion 61 of a fixed portion so as to be rotatable in the horizontal direction. When the hydraulic cylinder 15 is attached to the hollow tube 1 and the fixed portion 16, the hydraulic cylinder 5 is maintained in a horizontal position, and when the leader cylinder 3 is positioned at the central position in the vertical direction, the external force is transmitted to the leader 12. Is preferable in that it is efficiently performed.
【００１５】また、図５に示すように、中空管往復回動
装置１０の上方に位置するホッパー２２や強制昇降装置
２１は中空管往復回動装置１０の固定部１６と一体的に
結合されている。このため、ホッパー２２、強制昇降装
置２１及び中空管往復回動装置１０は、強制昇降装置２
１の下降起動により同様に下降し、上昇起動により同様
に上昇する。ホッパー２２は中空管１に砂杭材料を投入
し易くするためのもので公知のものが用いられる。ま
た、強制昇降装置２１は、貫入時と引き抜き時にリーダ
ー１２からの反力が得られるものである限り特に限定さ
れず、例えば、ラックとピニオンによるもの、チェーン
とスプロケットによるもの、ワイヤーロープの牽引によ
るもの、などが挙げられる。Further, as shown in FIG. 5, the hopper 22 and the forced lifting device 21 located above the hollow tube reciprocating / rotating device 10 are integrally connected to the fixing portion 16 of the hollow tube reciprocating / rotating device 10. Has been done. Therefore, the hopper 22, the forcible lifting device 21, and the hollow tube reciprocating / turning device 10 are connected to the forcible lifting device 2.
Similarly, a descent start of 1 causes the same to descend, and an ascending start causes a similar rise. As the hopper 22, a known one is used to facilitate the loading of the sand pile material into the hollow tube 1. Further, the forced lifting device 21 is not particularly limited as long as it can obtain a reaction force from the leader 12 at the time of penetration and extraction, and for example, by a rack and a pinion, by a chain and a sprocket, and by pulling a wire rope. Things, etc.
【００１６】次に、本例の砂杭造成用中空管を用いて地
中に円形断面の砂杭を造成する方法を説明する。先ず、
強制昇降装置２１の下降起動と共に、中空管往復回動装
置１０が起動され、砂杭造成用中空管４は所定の回動範
囲内を押し引きされ、往復回動しつつ所定深度まで貫入
される。貫入工程において砂杭造成用中空管４を回動さ
せることにより貫入効率が向上する。砂杭造成用中空管
４は所定深度まで打ち込まれると、その所定深度位置で
の往復回動操作工程に移る。回動範囲としては、前記貫
入時での回動範囲と同様でよく、図６に符号Ｚで示され
る９０度である。すなわち、Ａ−Ｂ線上に突起部の一方
の先端２１ｄ、２１ｂがくるような位置２５ｂから矢印
Ｙ方向に回動させ、Ｃ−Ｄ線上に該先端２１ｄ、２１ｂ
がくるような位置２５ａ（但し、図中、２５ａと２５ｂ
は同一形状となる。）で停止し、更に、矢印Ｘ方向に回
動させ、Ａ−Ｂ線上に該先端２１ｄ、２１ｂがくるよう
な位置２５ｂで停止し、これを必要により繰り返すこと
で、引き抜き後、斜線で示される円形断面の引き抜き跡
２５が得られる。また、往復回動操作工程で回動を行わ
ないと、引き抜き後、中空管の先端形状に相応する形状
の抜け跡ができるのみであり、円形断面の砂杭を造成す
ることはできない。Next, a method of forming a sand pile having a circular cross section in the ground by using the hollow pipe for sand pile formation of this example will be described. First,
The hollow tube reciprocating rotating device 10 is started when the forced elevating device 21 is started to descend, and the hollow pipe 4 for sand pile formation is pushed and pulled within a predetermined rotating range and reciprocally rotates and penetrates to a predetermined depth. To be done. By rotating the hollow pile 4 for forming sand piles in the penetration step, the penetration efficiency is improved. When the sand pipe forming hollow pipe 4 is driven to a predetermined depth, the process moves to a reciprocating rotation operation step at the predetermined depth position. The rotation range may be the same as the rotation range at the time of the penetration, and is 90 degrees indicated by the symbol Z in FIG. That is, the tip ends 21d and 21b are rotated on the line CD from the position 25b at which one of the tip ends 21d and 21b of the protrusion is on the line AB.
The position 25a where it comes in (however, in the figure, 25a and 25b
Have the same shape. ), Further rotate in the direction of arrow X, and stop at a position 25b where the tips 21d and 21b come on the line AB, and by repeating this as necessary, after withdrawing, it is indicated by diagonal lines. A drawing mark 25 having a circular cross section is obtained. Further, if the rotation is not performed in the reciprocating rotation operation step, only a trace of a shape corresponding to the shape of the tip of the hollow tube is formed after the pulling out, and a sand pile having a circular cross section cannot be formed.
【００１７】次いで、往復回動操作工程後、引き抜きに
よる砂杭材料の排出工程に移る。引き抜きのストローク
は、砂杭造成用中空管１の突起部２ａ〜２ｄの高さＨ、
又はそれ以下とする。高さＨの長さを引き抜けば、当該
引き抜き跡は確実に円形断面を形成しており、砂杭材料
排出後の形状も円形断面を形成することになる。砂杭材
料としては、特に制限されず、砂、砕石、砂利、その他砂
類似粒状材料、及びこれらに金属系還元材を混入させた
もの等が挙げられる。金属系還元材を含有する砂類は、
例えば、有機揮発性化合物で汚染された地下水などの浄
化を目的に構築される地下水浄化壁にも適用される。引
き抜きの場合、往復回動操作は特に不要である。引き抜
きにより形成された比較的緩い砂柱は砂杭造成用中空管
４を再貫入させることにより締固められる。締固めは砂
杭造成用中空管４を往復回動させながら行う。これによ
り、拡張された締固め円形断面の砂杭が得られる。Next, after the reciprocating rotation operation step, the sand pile material discharging step by pulling out is started. The stroke of the withdrawal is the height H of the protrusions 2a to 2d of the hollow pipe 1 for sand pile construction,
Or less. When the length of the height H is pulled out, the extraction trace surely forms a circular cross section, and the shape after discharging the sand pile material also forms a circular cross section. The sand pile material is not particularly limited, and examples thereof include sand, crushed stone, gravel, and other sand-like granular materials, and materials obtained by mixing these with a metal-based reducing material. Sands containing metal-based reducing material,
For example, it is also applied to a groundwater purification wall constructed for the purpose of purification of groundwater contaminated with organic volatile compounds. In the case of pulling out, reciprocating rotation operation is not particularly necessary. The relatively loose sand column formed by drawing is compacted by re-penetrating the hollow pile 4 for sand pile formation. The compaction is performed while reciprocally rotating the hollow pile 4 for sand pile formation. This results in an expanded compacted circular cross-section sand pile.
【００１８】本例の砂杭造成用中空管４及びこれを用い
た円形断面の砂杭造成工法によれば、振動や騒音を極力
抑制することができると共に、該中空管を備える砂杭造
成装置において、電動モーターやスイベル装置を省略す
ることができ、設備費のコストの上昇を抑制することが
できる。これら電動モーターやスイベル装置は機構が複
雑であり、且つ大掛かりなものであるため、装置のコス
ト上昇の一因となっていた。しかし、本発明の砂杭造成
用中空管を用いれば、回転駆動装置やスイベル装置は省
略することができるため、該砂杭造成装置を簡略且つコ
ストが低減されたものとすることができる。According to the sand pile forming hollow tube 4 of this example and the sand pile forming method of a circular cross section using the same, the vibration and noise can be suppressed as much as possible, and the sand pile including the hollow tube is provided. In the forming device, the electric motor and the swivel device can be omitted, and the increase in equipment cost can be suppressed. Since these electric motors and swivel devices have complicated mechanisms and are large-scaled, they have contributed to the cost increase of the devices. However, if the hollow pipe for sand pile formation of the present invention is used, the rotary drive device and the swivel device can be omitted, so that the sand pile formation device can be simplified and the cost can be reduced.
【００１９】本発明の砂杭造成用中空管は、上記実施の
形態以外に、例えば、前記突起部が、中空管１の先端部
の左右両側のみ（前後両側のみも同じ）に付設される形
態であってもよい。すなわち、突起部が２個の場合であ
る。この場合、回動範囲は１８０度となり、しかも中空
管往復回動装置は前記油圧シリンダー形式のものは使用
できないものの、電動機と歯車を組み合わせた機械式回
動装置を使用すればよく、この場合においても、前記実
施の形態に係る発明と同様の効果を奏する。In addition to the above-described embodiment, the sand pipe forming hollow tube of the present invention has, for example, the above-mentioned protrusions attached to both left and right sides of the tip of the hollow tube 1 (the same applies to both front and rear sides). It may be in a form. That is, this is the case where there are two protrusions. In this case, the turning range is 180 degrees, and the hollow cylinder reciprocating turning device cannot use the hydraulic cylinder type, but a mechanical turning device in which an electric motor and gears are combined can be used. Also in the above, the same effect as the invention according to the above-described embodiment is obtained.
【００２０】[0020]
【発明の効果】本発明の砂杭造成用中空管を用いた工法
によれば、振動や騒音を極力抑制することができると共
に、該中空管を備える砂杭造成装置において、電動モー
ターやスイベル装置を省略することができ、設備費のコ
ストの上昇を抑制することができる。According to the method of using the hollow pipe for sand pile formation of the present invention, vibration and noise can be suppressed as much as possible, and in a sand pile formation device equipped with the hollow pipe, an electric motor or The swivel device can be omitted, and an increase in the cost of equipment can be suppressed.
【図１】本例の砂杭造成用中空管の一部の正面図であ
る。FIG. 1 is a front view of a part of a hollow pipe for sand pile construction of the present example.
【図２】図１の平面図である。FIG. 2 is a plan view of FIG.
【図３】中空管往復回動装置の平面図である。FIG. 3 is a plan view of a hollow tube reciprocating and rotating device.
【図４】中空管往復回動装置の一部を破断して示す正面
図である。FIG. 4 is a front view showing a hollow tube reciprocating rotary device with a part cut away.
【図５】本例の砂杭造成用中空管を装着した砂杭造成装
置の概略図である。FIG. 5 is a schematic view of a sand pile building device equipped with the hollow tube for sand pile building of this example.
【図６】本例の砂杭造成用中空管を用いて造成される砂
杭の断面形状を示す図である。FIG. 6 is a diagram showing a cross-sectional shape of a sand pile formed by using the hollow pipe for forming a sand pile of this example.
１ 円筒状中空管 ２、２ａ〜２ｄ 突起部 ３ａ〜３ｄ 掘削ビット ４ 砂杭造成用中空管 １０ 中空管往復回動装置 １２ リーダー １３ リーダーガイド １５ 油圧シリンダー １６ 固定部 １７ ピストンロッド軸支部 １８ 中空状円盤部材 ２１ 強制昇降装置 ２１ａ〜２１ｄ 突起部の先端 ２２ａ〜２２ｄ 突起部の天板 ２２ ホッパー ２５ 砂杭 ５１ シリンダー部 ５２ ピストンロッド ６１ シリンダー軸支部 1 Cylindrical hollow tube 2, 2a to 2d protrusion 3a-3d drilling bit 4 Hollow tube for sand pile construction 10 Hollow tube reciprocating turning device 12 leader 13 Leader Guide 15 hydraulic cylinder 16 Fixed part 17 Piston rod shaft support 18 Hollow disk member 21 Forced lifting device 21a-21d Tip of protrusion 22a to 22d Top plate of protrusions 22 hopper 25 sand piles 51 Cylinder 52 Piston rod 61 Cylinder shaft support
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田中 肇一 東京都台東区台東１丁目２番１号 不動建 設株式会社内 Ｆターム(参考） 2D043 CA02 CA06 DA05 DB01 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor, Hajime Tanaka 1-2-1 Taito, Taito-ku, Tokyo Fudoken Inside the corporation F-term (reference) 2D043 CA02 CA06 DA05 DB01
Claims (3)
該中空管の先端部の少なくとも左右両側に付設され、各
先端が該円筒状中空管の中心からそれぞれ等距離にある
突起部とを備え、該突起部の断面形状が略三角形状であ
って、往復回動操作により、地中に円形断面の砂杭を造
成するものであることを特徴とする砂杭造成用中空管。1. A cylindrical hollow tube into which sand pile material is charged,
The hollow tube is provided with at least left and right sides of the tip, and each tip is provided with a protrusion that is equidistant from the center of the cylindrical hollow pipe, and the cross section of the protrusion has a substantially triangular shape. The hollow pipe for sand pile formation is characterized in that a sand pile having a circular cross section is formed in the ground by reciprocating rotation operation.
両側及び前後両側に付設される４個であることを特徴と
する請求項１記載の砂杭造成用中空管。2. The hollow pipe for constructing a sand pile according to claim 1, wherein the number of the protrusions is four on the left and right sides and the front and rear sides of the tip of the hollow pipe.
の所定深度までの貫入工程、その所定深度位置での往復
回動操作工程、引き抜きによる砂杭材料の排出工程、往
復回動操作による再貫入工程の各工程を地表まで順次繰
り返して行い、地中に円形断面の砂杭を造成することを
特徴とする砂杭造成工法。3. The step of penetrating the hollow pipe for sand pile construction according to claim 1 or 2 to a predetermined depth, the reciprocating rotation operation step at the predetermined depth position, the discharging step of the sand pile material by pulling out, the reciprocating operation. A sand pile construction method characterized in that each step of the re-penetration step by dynamic operation is sequentially repeated up to the surface of the earth to form a sand pile with a circular cross section in the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001316450A JP3868254B2 (en) | 2001-10-15 | 2001-10-15 | Circular sand pile construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001316450A JP3868254B2 (en) | 2001-10-15 | 2001-10-15 | Circular sand pile construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003119767A true JP2003119767A (en) | 2003-04-23 |
| JP3868254B2 JP3868254B2 (en) | 2007-01-17 |
Family
ID=19134470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001316450A Expired - Fee Related JP3868254B2 (en) | 2001-10-15 | 2001-10-15 | Circular sand pile construction method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3868254B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005054587A1 (en) * | 2003-12-04 | 2005-06-16 | Nimens Joseph R E | Method and apparatus for installing a helical pile |
| JP2018059285A (en) * | 2016-10-03 | 2018-04-12 | 株式会社不動テトラ | Hollow tube for displacement-reduced type compacting sand-pile creation and compacting sand-pile creating method |
-
2001
- 2001-10-15 JP JP2001316450A patent/JP3868254B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005054587A1 (en) * | 2003-12-04 | 2005-06-16 | Nimens Joseph R E | Method and apparatus for installing a helical pile |
| JP2018059285A (en) * | 2016-10-03 | 2018-04-12 | 株式会社不動テトラ | Hollow tube for displacement-reduced type compacting sand-pile creation and compacting sand-pile creating method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3868254B2 (en) | 2007-01-17 |
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