JPH06200521A - Land formation device for compaction sand pile, etc. - Google Patents
Land formation device for compaction sand pile, etc.Info
- Publication number
- JPH06200521A JPH06200521A JP36155992A JP36155992A JPH06200521A JP H06200521 A JPH06200521 A JP H06200521A JP 36155992 A JP36155992 A JP 36155992A JP 36155992 A JP36155992 A JP 36155992A JP H06200521 A JPH06200521 A JP H06200521A
- Authority
- JP
- Japan
- Prior art keywords
- hollow pipe
- hollow tube
- pile
- sand
- hollow
- 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.)
- Pending
Links
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、地盤中に締固めて締固
め砂杭を造成するときに使用する造成装置に関するもの
である。なお、本明細書中で使用する砂とは、砂、砂
利、砕石、鉱さい等の砂類似粒状材料およびそれらを組
合わせて混合物として用いた場合も含む。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building apparatus used when building a compacted sand pile by compacting it in the ground. The sand used in the present specification includes sand-like granular materials such as sand, gravel, crushed stone, ore, and the case where they are used as a mixture in combination.
【０００２】[0002]
【従来技術】この種の締固め砂杭等造成装置は、特公昭
６２−２５８０８号公報などで知られる如く、リーダー
に沿って昇降装置により上下動される中空管と、前記中
空管を正転又は逆転する回転駆動装置とを備え、前中空
管を地盤中の設計深度まで貫入した後、地表まで引抜く
過程で、前記中空管を一定深さ引抜きその下端部から管
内に投入された砂等を排出する引抜き工程と、前記中空
管を再び貫入して排出砂等を締固める再貫入工程とを繰
り返し行う（図７を参照）ことにより、拡径した締固め
砂杭を造成することによって、地盤改良するものであ
る。2. Description of the Related Art As is known from Japanese Patent Publication No. 62-25808, a device for forming compacted sand piles of this type includes a hollow tube which is vertically moved by a lifting device along a leader, and the hollow tube. Equipped with a rotation drive device for normal rotation or reverse rotation, after the front hollow tube has penetrated to the design depth in the ground and then withdrawn to the surface of the earth, the hollow tube is drawn to a certain depth and put into the tube from its lower end. By repeatedly performing the drawing step for discharging the sand and the like, and the re-penetration step for penetrating the hollow tube again to compact the discharged sand (see FIG. 7), the compacted sand pile with the expanded diameter is obtained. The ground will be improved by creating it.
【０００３】前記中空管は、直線状の鋼管であり、これ
に螺旋羽根を設けたものが多く用いられている。施工操
作方法としては、図６に示す如く中空管ａをリーダーｂ
に沿って操作用のワイャｃで吊り下げた状態で、また回
転駆動装置ｄにより中空管ａを正転又は逆転しながら行
う。The hollow tube is a straight steel tube, and a tube provided with spiral blades is often used. As a construction operation method, as shown in FIG.
It is carried out in a state of being suspended by an operating wire c along the hollow tube a while being normally or reversely rotated by the rotary drive device d.
【０００４】[0004]
【発明が解決しようとする課題】以上の締固め砂杭等造
成装置は、排出砂等を中空管の再貫入によって締固め
て、拡径した締固め砂杭を造成するものであり、杭径や
強度が締固め力に対応する。ところが、このような締固
め力は、起振機を装備しない場合には専ら吊り下げ状態
にある中空管および回転駆動装置の重量によりほぼ決っ
てしまうため、締固め力が不足する場合もあり得る。一
方、起振機を装備して再貫入時に振動を加えると締固め
力を増大できる利点はあるが、この方法では振動・騒音
問題を生じる可能性があり、民家など近接している施工
域では考慮を要する。また、従来装置では、排出砂杭径
が主に中空管の径と管外周の螺旋羽根幅寸法とにより決
まる関係上、杭径を大きくしたい場合に中空管全体を交
換しなければならなかった。DISCLOSURE OF THE INVENTION The above-described compacting sand pile forming apparatus is for compacting discharged sand or the like by re-penetration of a hollow tube to form an expanded compacting sand pile. Diameter and strength correspond to compaction force. However, such a compaction force is almost entirely determined by the weight of the hollow tube and the rotary drive device that are in a suspended state when the exciter is not equipped, and therefore the compaction force may be insufficient. obtain. On the other hand, although there is an advantage that the compaction force can be increased by adding vibration to the re-penetration with a vibration exciter, this method may cause vibration and noise problems. It requires consideration. Further, in the conventional device, the diameter of the discharged sand pile is mainly determined by the diameter of the hollow tube and the width of the spiral blade on the outer circumference of the tube, and therefore the entire hollow tube must be replaced when the pile diameter is to be increased. It was
【０００５】本発明は、以上のような問題を解消するも
のであり、振動および騒音問題がなく、締固め力および
杭径を増大できる締固め砂杭等造成装置を提供すること
を目的とする。The present invention solves the above problems, and an object of the present invention is to provide an apparatus for forming compacted sand piles, etc., which has no problems of vibration and noise and can increase the compaction force and the pile diameter. .
【０００６】[0006]
【課題を解決するための手段】以上の目的を達成するた
め本発明は、垂直に立てられたリーダーに沿って昇降さ
れる中空管と、前記中空管を正転又は逆転する回転駆動
装置と、前記中空管および回転駆動装置を昇降させる昇
降装置とを備えた砂杭等造成装置において、前記中空管
は、少なくともその下部側にあってその外形が管軸から
ずれるよう突出状態に設けられた張出部を有している。In order to achieve the above object, the present invention provides a hollow tube which is vertically moved along a vertically standing leader, and a rotary drive device which rotates the hollow tube in a normal or reverse direction. And a device for constructing a sand pile or the like including the hollow pipe and an elevating device for elevating and lowering the rotary drive device, the hollow pipe is in a protruding state such that the hollow pipe is at least on the lower side thereof and the outer shape of the hollow pipe is displaced from the pipe axis It has an overhang provided.
【０００７】[0007]
【作用】以上本発明の締固め砂杭等造成装置では、中空
管が回転駆動装置により回転されると、下部側に設けら
れた張出部が管軸からずれた軌跡で回転するので、貫入
過程においてはそのずれた分だけ孔径が大きくなり、ま
た再貫入過程では張出部による下方への押圧力も締固め
力に付加される。As described above, in the compacting sand pile forming device of the present invention, when the hollow pipe is rotated by the rotary drive device, the overhanging portion provided on the lower side rotates in a trajectory displaced from the pipe axis. In the penetrating process, the hole diameter becomes larger by the amount of deviation, and in the re-penetrating process, the downward pressing force by the overhanging portion is also added to the compacting force.
【０００８】[0008]
【実施例】図１は本発明の装置全体構成を示し、図２と
図３は要部を示している。同図の締固め砂杭等造成装置
は、ベースマシン１で支持されたリーダー２と、リーダ
ー２に沿って移動されるとともに、ホッパー装置３から
砂等が投入される中空管４と、中空管４を移動する昇降
装置５と、中空管４を正転又は逆回する回転駆動装置６
などを備えている点で従来と同じ。異なる構成は中空管
４に工夫を施した点、昇降装置５がラック・ピニオン方
式を採用している点であり、以下、これら要部構成を詳
述する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the overall construction of the apparatus of the present invention, and FIGS. 2 and 3 show the essential parts. The compacting sand pile building device of FIG. 1 includes a leader 2 supported by a base machine 1, a hollow tube 4 that is moved along the leader 2 and into which sand or the like is fed from a hopper device 3. A lifting device 5 for moving the empty tube 4, and a rotation drive device 6 for rotating the hollow tube 4 in the forward or reverse direction.
It is the same as the conventional one in that it is equipped with. The different configurations are that the hollow tube 4 is devised and that the lifting device 5 adopts a rack and pinion system. The configuration of these main parts will be described in detail below.
【０００９】昇降装置５は、ラック・ピニオン方式であ
り、油圧モーターなどでピニオンを回動するピニオン機
構７を中空管１側に装備し、正転又は逆転されるピニオ
ンがリーダー２に沿って固定されたラック８と噛み合い
ながら、上下動するもので、個々の装置機構は周知なも
のである。なお、昇降装置５、ポッパー装置３、回転駆
動装置６はユニット化されて一体に結合している。The elevating device 5 is a rack and pinion system, in which a pinion mechanism 7 for rotating a pinion by a hydraulic motor or the like is provided on the hollow tube 1 side, and a pinion for normal rotation or reverse rotation is provided along the leader 2. It moves up and down while engaging with the fixed rack 8, and the individual device mechanisms are well known. The lifting device 5, the popper device 3, and the rotation driving device 6 are unitized and integrally connected.
【００１０】中空管４は、螺旋羽根９を外周に固定した
直状部１０と、直状部１０の下部側に連結された締固め
補助用の張出部１１と、張出部１１の下部に連結された
直状下端部１２と、この外周に設けられた掘削刃１３な
どを一体に装備している。張出部１１は、管軸からずれ
るよう略く形に形成したものであり、く形の中間部から
上側の傾斜軸部１１ａと下側の傾斜軸部１１ｂとからな
る。両傾斜軸部１１ａ，１１ｂの角度は、中空管４内に
投入された砂等が直状部１０から下端部１２へスムース
に排出可能に設定される。The hollow tube 4 has a straight portion 10 having spiral blades 9 fixed to the outer periphery thereof, a bulging portion 11 connected to the lower side of the straight portion 10 for assisting compaction, and a bulging portion 11. The straight lower end portion 12 connected to the lower portion and the excavating blade 13 provided on the outer periphery of the straight lower end portion 12 are integrally equipped. The overhanging portion 11 is formed in a substantially rectangular shape so as to deviate from the tube axis, and is composed of an upper inclined shaft portion 11a and a lower inclined shaft portion 11b from a rectangular middle portion. The angles of both the inclined shaft portions 11a and 11b are set so that the sand or the like put into the hollow tube 4 can be smoothly discharged from the straight portion 10 to the lower end portion 12.
【００１１】次に、以上の装置を用いて締固め砂杭を造
成したときの施工要領を概説する。施工サイクルは、図
７に示す如く中空管４を地盤中の設計深さＧ1まで貫入
する工程（以下、初期貫入工程という）と、設計深さＧ
1から地表まで引抜く過程で、中空管４を一定深さ引抜
く引抜き工程と中空管４を再び貫入する再貫入工程とを
繰り返し行う。そして、これら各工程において、中空管
４を貫入したり、引抜いたり、再貫入する操作は昇降装
置５のピニオン機構７の制御により行われる。Next, an outline of a construction procedure when a compacted sand pile is formed using the above apparatus will be described. As shown in FIG. 7, the construction cycle includes a step of penetrating the hollow pipe 4 to a design depth G1 in the ground (hereinafter referred to as an initial penetration step) and a design depth G.
In the process of drawing from 1 to the surface of the earth, the drawing process of drawing the hollow pipe 4 to a certain depth and the re-penetration process of re-penetrating the hollow pipe 4 are repeated. Then, in each of these steps, the operation of penetrating, withdrawing, and re-penetrating the hollow tube 4 is performed by the control of the pinion mechanism 7 of the elevating device 5.
【００１２】初期貫入工程では、中空管４が回転駆動装
置６により回転されつつ、ピニオン機構７により貫入さ
れる。中空管４の内部には、初期貫入工程の過程ないし
は設計深さＧ1に達した前後にホッパー装置３を介して
所定量の砂が投入される。そして、図示を省略している
が、中空管４は空気供給装置から圧縮空気が供給されて
内部が圧気される。管内が充分に圧気された後、前記引
抜き工程が行われる。その後、中空管１内の圧気を排出
し、再貫入工程が行われ、この際、中空管１内に上方か
らあらたに砂が供給される。以後、上記工程が繰り返し
行われる。In the initial penetration step, the hollow tube 4 is rotated by the rotary drive device 6 and penetrated by the pinion mechanism 7. A predetermined amount of sand is introduced into the hollow tube 4 through the hopper device 3 in the process of the initial penetration step or before and after reaching the design depth G1. Although not shown, compressed air is supplied from the air supply device to the hollow tube 4 so that the inside thereof is compressed. After the inside of the tube is sufficiently pressurized, the drawing step is performed. After that, the compressed air in the hollow tube 1 is discharged, and a re-penetration step is performed. At this time, sand is newly supplied into the hollow tube 1 from above. After that, the above steps are repeated.
【００１３】引抜き工程では、図２に示す如く中空管４
が回転駆動装置６で逆転されながら、ピニオン機構７の
ピニオンも逆転されラック８に沿って上方向へ動かさ
れ、同時に下端部１２から管内の砂が排出される。排出
される砂は中空管４の引抜き深さに比例した量であり、
締固め前の排出砂杭部分１４ａを形成する。再貫入工程
では、図３に示す如く中空管４が回転駆動装置６で正転
されながら、ピニオン機構７のピニオンも正転されラッ
ク８に沿って下方向へ動かされ、中空管４が再び貫入さ
れて排出砂杭部分１４ａを締固める。以上の引抜き工程
と再貫入工程とを順次に地表側まで繰り返し行うことに
より、地盤中には各再貫入工程での締固め力に応じ締固
められた締固め砂杭が造成される。In the drawing step, as shown in FIG. 2, the hollow tube 4
While being rotated in the reverse direction by the rotary drive device 6, the pinion of the pinion mechanism 7 is also reversed and moved upward along the rack 8 and, at the same time, the sand in the pipe is discharged from the lower end portion 12. The amount of sand discharged is proportional to the extraction depth of the hollow tube 4,
The discharged sand pile portion 14a before compaction is formed. In the re-penetration step, as shown in FIG. 3, while the hollow tube 4 is normally rotated by the rotary drive device 6, the pinion of the pinion mechanism 7 is also normally rotated and moved downward along the rack 8 so that the hollow tube 4 is moved. It is penetrated again and compacts the discharged sand pile portion 14a. By repeating the above-mentioned drawing process and re-penetration process sequentially to the ground surface side, compacted sand piles that have been compacted according to the compaction force in each re-penetration process are created in the ground.
【００１４】そして、前記締固め過程では、張出部１１
の下側傾斜軸部１１ｂが管軸からずれた軌跡で回転し、
しかもその軸部回転外周側１１ｃの部分が逆末広がりの
軌跡をえがくので、掘削土を介して同図の矢印方向へ押
圧する力を発生する。この押圧力は下端部１２により締
固められつつある途中締固め砂杭部分１４ｂにも達し、
下端部１２による締固め力に付加される。このような、
湾曲部１１による締固め作用は、下側傾斜軸部１４ａの
角度や中空管４の再貫入深さなどにより異なるものの、
これを設けない場合に対してかなり増大できることが確
認された。In the compaction process, the overhanging portion 11 is formed.
The lower inclined shaft portion 11b rotates on a trajectory displaced from the pipe axis,
In addition, since the portion of the shaft portion rotation outer peripheral side 11c encloses the locus in which the reverse end spreads, a force is generated through the excavated soil in the direction of the arrow in the figure. This pressing force reaches the mid-compacting sand pile portion 14b which is being compacted by the lower end portion 12,
In addition to the compaction force by the lower end portion 12. like this,
Although the compaction action by the curved portion 11 differs depending on the angle of the lower inclined shaft portion 14a, the re-penetration depth of the hollow tube 4, and the like,
It was confirmed that this can be increased considerably compared to the case where this is not provided.
【００１５】図４は、前記締固め補助用の張出部の他の
例であり、第１実施例に対し張出部と掘削翼とが相違し
ている。同図の張出部１５は、中空管４における直状部
１０の下部側に設けられており、下向き勾配の上半体傾
斜部１５ａと、上向き勾配の下半体傾斜部１５ｂとを対
抗配置して溶接により固定した構造である。また、ここ
では張出部１５を３段構成で設けたが、１段以上あれば
よい。なお、掘削翼１６は掘削片形状のものが用いられ
ている。FIG. 4 shows another example of the overhanging portion for assisting the compaction, which is different from the first embodiment in the overhanging portion and the excavating blade. The overhanging portion 15 in the figure is provided on the lower side of the straight portion 10 in the hollow tube 4, and opposes the upper half inclined portion 15a of the downward slope and the lower half inclined portion 15b of the upward slope. The structure is arranged and fixed by welding. Further, although the overhanging portion 15 is provided in the three-stage configuration here, it may be provided in one or more stages. The excavation blade 16 is in the shape of an excavation piece.
【００１６】図５は、前記締固め補助用の張出部をさら
に変形した例であり、第１実施例に対し張出部と掘削翼
とが相違している。同図の張出部１７は、中空管４にお
ける直状部１０の下部側に３段構成で設けられており、
何れもが半鍔形状をなし、溶接により固定した構造であ
る。図４、図５のような、張出部１５，１７は、張出部
１１と同様な作用効果が得られ、しかも構造的により簡
易であること、砂等の排出路は直状のまま維持されてい
るので何ら悪影響を与える虞もない点で優れている。FIG. 5 is an example in which the overhanging portion for assisting the compaction is further modified, and the overhanging portion and the excavating blade are different from those of the first embodiment. The overhanging portion 17 in the figure is provided in the lower portion side of the straight portion 10 in the hollow tube 4 in a three-stage configuration,
All of them have a semi-collar shape and are fixed by welding. The overhanging portions 15 and 17 as shown in FIGS. 4 and 5 have the same operational effect as the overhanging portion 11, and are structurally simpler, and the discharge path for sand or the like is kept straight. Therefore, it is excellent in that it does not have any adverse effect.
【００１７】なお、以上の実施例では、昇降装置５とし
てラック・ピニオン方式を採用し、再貫入工程において
中空管１をラック８と噛み合うピニオン機構７により再
貫入するので、ピニオン機構７のピニオンがラック８と
噛み合って回転する際の反力に応じて増大される。しか
し、本発明は、昇降装置５としてはラック・ピニオン方
式に限らず、例えば従来例に示した如く巻取り装置から
引き出されるワイャで中空管を吊り下げた状態にして、
昇降操作する吊り下げ方式でも可能である。In the above embodiments, the rack and pinion system is adopted as the lifting device 5, and the hollow tube 1 is re-penetrated by the pinion mechanism 7 that meshes with the rack 8 in the re-penetration process. Is increased according to the reaction force generated when the rack rotates in mesh with the rack 8. However, the present invention is not limited to the rack and pinion system as the lifting device 5, and, for example, as shown in the conventional example, the hollow tube is hung by a wire pulled out from the winding device,
It is also possible to use a suspension system that operates up and down.
【００１８】[0018]
【発明の効果】以上説明したように、本発明の締固め砂
杭等造成装置は、中空管の下部側に設けられた張出部が
管軸からずれた軌跡で回転するので、貫入過程では張出
部のずれた分だけ孔径を大きくでき（排出砂径も比例す
る）、再貫入過程では張出部が下方へ押圧するので締固
め力をより大きくできる。したがって、本発明は、従来
の起振機を用いる場合のような騒音問題を生じることな
く、締固め砂杭の締固め力および杭径を簡易に増大でき
る。As described above, according to the compacting sand pile forming apparatus of the present invention, the overhanging portion provided on the lower side of the hollow tube rotates in a path deviated from the tube axis. With, the hole diameter can be increased by the amount of deviation of the overhanging portion (proportional to the discharged sand diameter), and the overhanging portion presses downward during the re-penetration process, so the compaction force can be increased. Therefore, the present invention can easily increase the compacting force and the pile diameter of the compacting sand pile without causing the noise problem as in the case of using the conventional vibrator.
【図１】本発明の締固め砂杭等造成装置の全体構成例を
示す図である。FIG. 1 is a diagram showing an example of the overall configuration of a compacting sand pile forming device of the present invention.
【図２】引抜き工程時における中空管の要部を拡大して
示す図である。FIG. 2 is an enlarged view showing a main part of a hollow tube during a drawing process.
【図３】再貫入工程時における中空管の締固め作用を示
す図である。FIG. 3 is a diagram showing the compacting action of the hollow tube during the re-penetration step.
【図４】前記中空管の要部の他の構成例を拡大して示す
図である。FIG. 4 is an enlarged view showing another configuration example of the main part of the hollow tube.
【図５】前記中空管の要部をさらに変形した構成例を拡
大して示す図である。FIG. 5 is an enlarged view showing a configuration example in which a main part of the hollow tube is further modified.
【図６】前記従来装置を模式的に示す図である。FIG. 6 is a diagram schematically showing the conventional device.
【図７】締固め砂杭等造成装置における施工サイクルを
示す図である。FIG. 7 is a diagram showing a construction cycle in the compacting sand pile forming apparatus.
２ リーダー ４ 中空管 ６ 回転駆動装置 ５ 昇降装置 １１ 張出部 １５ 張出部 １７ 張出部 2 leader 4 hollow tube 6 rotation drive device 5 lifting device 11 overhanging part 15 overhanging part 17 overhanging part
Claims (1)
される中空管と、前記中空管を正転又は逆転する回転駆
動装置と、前記中空管および回転駆動装置を昇降させる
昇降装置とを備えた砂杭等造成装置において、 前記中空管は、少なくともその下部側にあってその外形
が管軸からずれるよう突出状態に設けられた張出部を有
していることを特徴とする砂杭等造成装置。1. A hollow tube which is moved up and down along a vertically standing leader, a rotary drive device which rotates the hollow pipe in a normal or reverse direction, and a lifting device which moves the hollow pipe and the rotary drive device up and down. In the sand pile and the like forming apparatus including, the hollow tube has an overhanging portion provided in a protruding state so that the outer shape thereof is displaced from the tube axis at least on the lower side thereof, Equipment for creating sand piles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36155992A JPH06200521A (en) | 1992-12-29 | 1992-12-29 | Land formation device for compaction sand pile, etc. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36155992A JPH06200521A (en) | 1992-12-29 | 1992-12-29 | Land formation device for compaction sand pile, etc. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06200521A true JPH06200521A (en) | 1994-07-19 |
Family
ID=18474068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP36155992A Pending JPH06200521A (en) | 1992-12-29 | 1992-12-29 | Land formation device for compaction sand pile, etc. |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06200521A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010133232A (en) * | 2008-10-28 | 2010-06-17 | Toyo Constr Co Ltd | Apparatus and method for constructing sand pile |
| JP2017186752A (en) * | 2016-04-01 | 2017-10-12 | あおみ建設株式会社 | Method for establishing compaction ground improvement pile |
| JP7174388B1 (en) * | 2022-02-04 | 2022-11-17 | 強化土エンジニヤリング株式会社 | Static compaction method |
-
1992
- 1992-12-29 JP JP36155992A patent/JPH06200521A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010133232A (en) * | 2008-10-28 | 2010-06-17 | Toyo Constr Co Ltd | Apparatus and method for constructing sand pile |
| JP2017186752A (en) * | 2016-04-01 | 2017-10-12 | あおみ建設株式会社 | Method for establishing compaction ground improvement pile |
| JP7174388B1 (en) * | 2022-02-04 | 2022-11-17 | 強化土エンジニヤリング株式会社 | Static compaction method |
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