JP2003003462A - Soil stabilization method - Google Patents
Soil stabilization methodInfo
- Publication number
- JP2003003462A JP2003003462A JP2001195287A JP2001195287A JP2003003462A JP 2003003462 A JP2003003462 A JP 2003003462A JP 2001195287 A JP2001195287 A JP 2001195287A JP 2001195287 A JP2001195287 A JP 2001195287A JP 2003003462 A JP2003003462 A JP 2003003462A
- Authority
- JP
- Japan
- Prior art keywords
- soil
- ground
- steel pipe
- wet
- pipe pile
- 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
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Piles And Underground Anchors (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、軟弱地盤を強い地
盤に改良するための地盤改良工法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement method for improving soft ground into strong ground.
【０００２】[0002]
【従来の技術】地盤改良工法として、出願人は、固化材
としてセメントミルクを用いる湿式工法、およびセメン
ト粉末を用いる乾式工法のそれぞれの長所を活かした工
法、すなわち、地盤をスクリューオーガーで掘削して縦
穴を形成し、掘削した現状土にセメント系固化材を混合
して乾式改良土を生成し、乾式改良土と水またはセメン
ト含有水とを縦穴内でスクリューオーガーにより混練し
てスラリー状の湿式改良土を生成し、湿式改良土を固化
させることによって、地中に柱状補強体を造成する工法
について提案した（特開平１１−２４７１７５号）。か
かる地盤改良工法によれば、小規模の設備で強度の高い
柱状補強体を造成することができ、軟弱地盤を非常に容
易に強化することができる。2. Description of the Related Art As a ground improvement method, the applicant takes advantage of each of the wet method using cement milk as a solidifying material and the dry method using cement powder, that is, excavating the ground with a screw auger. Forming a vertical hole, mixing the cement-based solidifying material with the excavated current soil to generate dry improved soil, and kneading the dry improved soil and water or cement-containing water with a screw auger in a vertical hole to improve slurry A method for forming a columnar reinforcing body in the ground by producing soil and solidifying the wet modified soil has been proposed (JP-A-11-247175). According to this ground improvement method, it is possible to construct a columnar reinforcing body having high strength with a small-scale facility, and it is possible to reinforce the soft ground very easily.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、改良さ
れた地盤における建設工事によっては、上記した地盤改
良工法でも改良が不十分な場合がある。また、改良され
た地盤で行われる建設工事の規模によっては、造成され
た柱状補強体に非常に強い力が加わって、柱状補強体が
座屈し、建設工事に支障をきたすおそれもある。However, depending on the construction work on the improved ground, the above ground improvement method may not be sufficient for improvement. In addition, depending on the scale of the construction work performed on the improved ground, a very strong force may be applied to the formed columnar reinforcement, which may cause the columnar reinforcement to buckle and hinder the construction work.
【０００４】本発明の目的は、軟弱地盤をきわめて強い
地盤に改良することができ、改良された地盤で大規模な
建設工事が行われた場合でも、建設工事に支障をきたす
ことがない地盤改良工法を提供することにある。An object of the present invention is to improve a soft ground to an extremely strong ground and to improve the ground so that the construction work will not be hindered even when a large-scale construction work is carried out on the improved ground. To provide a construction method.
【０００５】[0005]
【課題を解決するための手段】かかる本発明の構成のう
ち、請求項１に記載された発明の構成は、地盤をスクリ
ューオーガーで掘削して縦穴を形成し、掘削した現状土
にセメント系固化材を混合して乾式改良土を生成し、乾
式改良土と水またはセメント含有水とを縦穴内でスクリ
ューオーガーにより混練してスラリー状の湿式改良土を
生成し、その湿式改良土を固化させることによって地中
に柱状補強体を造成する地盤改良工法であって、前記湿
式改良土が固化する前に、湿式改良土の中に鋼管杭を打
ち込み、その杭とともに湿式改良土を固化させて柱状補
強体を造成することを特徴とする地盤改良工法にある。
請求項２に記載された発明の構成は、請求項１に記載さ
れた発明において、鋼管杭が、筒状であるとともに、少
なくとも先端部に螺旋翼を設けたものであることにあ
る。請求項３に記載された発明の構成は、請求項１、請
求項２に記載された発明において、鋼管杭が、先端に周
状のバイトを設けたものであることにある。Among the constitutions of the present invention, in the constitution of the invention described in claim 1, the ground is excavated with a screw auger to form a vertical hole, and the cement-based solidification is applied to the excavated present soil. Mixing the materials to produce a dry improved soil, kneading the dry improved soil and water or cement-containing water with a screw auger in a vertical hole to produce a slurry wet improved soil, and solidifying the wet improved soil. A soil improvement method for forming a columnar reinforcement body in the ground by driving a steel pipe pile into the wet improvement soil before the solidification of the wet improvement soil and solidifying the wet improvement soil together with the pile to form a columnar reinforcement. It is a ground improvement method characterized by creating a body.
According to a second aspect of the present invention, in the invention according to the first aspect, the steel pipe pile has a tubular shape and at least a tip end thereof is provided with a spiral blade. The structure of the invention described in claim 3 is that in the invention described in claims 1 and 2, the steel pipe pile is provided with a circumferential cutting tool at the tip.
【０００６】[0006]
【発明の実施の形態】以下、本発明に係る地盤改良工法
の一実施形態を図面に基づいて詳細に説明する。本発明
に係る工法によって軟弱地盤の改良工事を行う場合に
は、まず、施工する位置を定めて、補強体の仕上がり高
さを決定する。そして、それらの所定の初期段取り作業
を行った後には、図１に示すように、施工現場に、建柱
車、ミニ杭打ち機、トラックオーガー等の掘削機械（図
示せず）を搬入し、搬入した掘削機械にスクリューオー
ガー１を取り付けて、施工位置にセットする。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the ground improvement method according to the present invention will be described below in detail with reference to the drawings. When the soft ground is improved by the construction method according to the present invention, first, the position to be constructed is determined and the finished height of the reinforcing body is determined. Then, after carrying out the predetermined initial setup work, as shown in FIG. 1, an excavating machine (not shown) such as a construction column vehicle, a mini-pile driver, or a truck auger is carried into the construction site, Attach the screw auger 1 to the loaded excavating machine and set it at the construction position.
【０００７】次に、図２に示すように、スクリューオー
ガー１を正回転させ（スクリューが地盤内に入り込む方
向に回転させ）、地盤を掘削して縦穴２を形成する。そ
して、縦穴２を形成する際に、現状土３に粉末のセメン
ト系固化材４を添加し、現状土３と固化材４とをスクリ
ューオーガー１の回転を利用して混合し、乾式改良土５
を生成する。なお、セメント系固化材４としては、セメ
ントを主成分とし、アルミナ系鉱物、石膏またはスラグ
粉等の添加物を含む無機系材料を好適に用いることがで
きる。また、セメント系固化材４の現状土３に対する配
合量は、２００〜３００Ｋｇ／ｍ３ であることが好ま
しいが、現状土３の土質や地下水の含有量に応じて適宜
変更することができる。Next, as shown in FIG. 2, the screw auger 1 is normally rotated (the screw is rotated in the direction in which the screw enters the ground), and the ground is excavated to form the vertical hole 2. When the vertical hole 2 is formed, the powdery cement-based solidifying material 4 is added to the existing soil 3, the existing soil 3 and the solidifying material 4 are mixed by using the rotation of the screw auger 1, and the dry improved soil 5 is added.
To generate. As the cement-based solidifying material 4, an inorganic material containing cement as a main component and containing additives such as alumina-based minerals, gypsum or slag powder can be preferably used. Further, the content of the cement-based solidifying material 4 with respect to the current soil 3 is preferably 200 to 300 Kg / m 3 , but can be appropriately changed depending on the soil properties of the current soil 3 and the content of groundwater.
【０００８】上述の如く縦穴２を所要の深さまで掘削し
た後には、図３に示すように、スクリューオーガー１を
縦穴２から取り出し、しかる後、図４に示すように、乾
式改良土５を縦穴２に埋め戻す。続いて、図５に示すよ
うに、スクリューオーガー１により乾式改良土５を撹拌
し、現状土３とセメント系固化材４とを均一に混合す
る。そして、図６に示すように、撹拌済みの乾式改良土
５を地表に搬出し、スクリューオーガー１を縦穴２から
取り出す。After excavating the vertical hole 2 to the required depth as described above, the screw auger 1 is taken out from the vertical hole 2 as shown in FIG. 3, and then the dry improved soil 5 is vertical hole as shown in FIG. Backfill to 2. Subsequently, as shown in FIG. 5, the dry improved soil 5 is stirred by the screw auger 1 to uniformly mix the existing soil 3 and the cement-based solidifying material 4. Then, as shown in FIG. 6, the dry improved soil 5 that has been agitated is carried to the surface of the ground, and the screw auger 1 is taken out from the vertical hole 2.
【０００９】次に、図７に示すように、スクリューオー
ガー１を逆回転させ、乾式改良土５を縦穴２内に搬入す
るとともに、小型のプラントミキサー７によってセメン
トミルク６を縦穴２内に注入する。なお、セメントミル
ク６は、セメント系固化材を１００〜７００Ｋｇ／ｍ３
程度の配合量で水に溶解してなるセメント含有水であ
り、プラントミキサー７によって混合生成される。そし
て、スクリューオーガー１の逆回転によって、乾式改良
土５とセメントミルク６とを縦穴２内で混練しつつ締め
固め、スラリー状の湿式改良土８を生成する。かかる湿
式改良土８生成工程においては、乾式改良土５とセメン
トミルク６とを斑なく混合できるように、スクリューオ
ーガー１を所定のピッチで段階的に上昇させ、混練作業
を数回に分けて実施する（すなわち、乾式改良土５とセ
メントミルク６との混練を所定の時間だけ継続した後に
所定の高さだけスクリューオーガー１を上昇させる作業
を繰り返す）。そして、図８の如く、スクリューオーガ
ー１を湿式改良土８内から引き抜いて、混練作業を終了
する。Next, as shown in FIG. 7, the screw auger 1 is rotated in the reverse direction, the dry improved soil 5 is carried into the vertical hole 2, and the cement milk 6 is injected into the vertical hole 2 by the small plant mixer 7. . The cement milk 6 is a cement-based solidifying material of 100 to 700 Kg / m 3.
It is cement-containing water that is dissolved in water with a compounding amount of a certain degree, and is mixed and produced by the plant mixer 7. Then, by the reverse rotation of the screw auger 1, the dry improved soil 5 and the cement milk 6 are kneaded and compacted in the vertical hole 2 to produce a slurry wet improved soil 8. In the wet improved soil 8 generation step, the screw auger 1 is raised stepwise at a predetermined pitch so that the dry improved soil 5 and the cement milk 6 can be mixed without unevenness, and the kneading operation is performed in several times. (That is, the operation of raising the screw auger 1 by a predetermined height after repeating the kneading of the dry modified soil 5 and the cement milk 6 for a predetermined time is repeated). Then, as shown in FIG. 8, the screw auger 1 is pulled out from the wet improved soil 8 to complete the kneading operation.
【００１０】さらに、図９に示すように、掘削機械に取
り付けられているスクリューオーガー１を鋼管杭１０と
取り替えて、まだ硬化していない湿式改良土８の内部
に、鋼管杭１０を打ち込む。図１０は、打ち込む鋼管杭
１０を示したものであり、鋼管杭１０は、鉄によって筒
状に形成されており、先端を鋭角にした周状のバイト１
１が先端に取り付けられている。また、鋼管杭１０の先
端際の部分には、螺旋翼１２が、溶接によって一体的に
設けられており、鋼管杭１０の外周を約２周捲回した状
態になっている。湿式改良土８の内部への鋼管杭１０を
打ち込みは、鋼管杭１０を正回転させながら行う。な
お、鋼管杭１０を湿式改良土８の内部に打ち込む際に
は、湿式改良土８が、筒状の鋼管杭１０の内部に入り込
む。そして、図１１の如く、十分な深さまで鋼管杭１０
を打ち込んだ後には、十分な時間をかけて湿式改良土８
を養生して固化させる。かかる一連の作業によって、地
中に所要高さの柱状補強体９が造成され、周囲の軟弱地
盤が強化される。Further, as shown in FIG. 9, the screw auger 1 attached to the excavating machine is replaced with the steel pipe pile 10, and the steel pipe pile 10 is driven into the wet improved soil 8 which has not yet hardened. FIG. 10 shows a steel pipe pile 10 to be driven in. The steel pipe pile 10 is formed of iron into a tubular shape, and has a circumferential cutting tool 1 with an acute tip.
1 is attached to the tip. Further, a spiral blade 12 is integrally provided by welding at a portion near the tip of the steel pipe pile 10, and the outer circumference of the steel pipe pile 10 is wound about two rounds. The driving of the steel pipe pile 10 into the wet modified soil 8 is performed while the steel pipe pile 10 is normally rotated. When the steel pipe pile 10 is driven into the wet modified soil 8, the wet improved soil 8 enters the tubular steel pipe pile 10. Then, as shown in FIG. 11, the steel pipe pile 10 is made to a sufficient depth.
Sufficient time is required after driving into
Cure and solidify. Through such a series of operations, the columnar reinforcing member 9 having a required height is formed in the ground, and the soft ground around the pillar is reinforced.
【００１１】上記した地盤改良工法は、乾式改良土５を
スラリー状の湿式改良土８に変成して柱状補強体９を造
成するものであるので、従来の湿式工法と比較し、掘削
機やプラントミキサとして小型のものを使用できるた
め、施工コストが安価である上、機動性に優れており、
狭小地の改良工事に好適である。また、従来の乾式工法
と比較し、現状土３とセメント成分（セメント系固化材
４およびセメントミルク６）とを斑なく撹拌することが
でき、均質かつ高強度の柱状補強体９を造成することが
できる。さらに、従来の乾式工法と異なり、スラリー状
の湿式改良土８をスクリューオーガー１で締め固めるた
め、振動の発生を抑制でき、隣地、隣接物に影響が及び
にくくなる。In the above-mentioned ground improvement method, the dry type improved soil 5 is transformed into the slurry type wet improved soil 8 to form the columnar reinforcing member 9. Therefore, compared with the conventional wet method, an excavator or a plant is used. Since a small mixer can be used, the construction cost is low and it has excellent mobility.
It is suitable for improvement work on narrow land. Further, compared with the conventional dry construction method, it is possible to stir the current soil 3 and cement components (cement-based solidifying material 4 and cement milk 6) without unevenness, and to form a homogeneous and high-strength columnar reinforcement 9. You can Further, unlike the conventional dry construction method, the slurry type wet modified soil 8 is compacted by the screw auger 1, so that the generation of vibration can be suppressed, and the adjacent land and the adjacent material are less affected.
【００１２】また、上記地盤改良工法は、湿式改良土８
が固化する前に、湿式改良土８の中に鋼管杭１０を打ち
込み、その杭とともに湿式改良土８を固化させて柱状補
強体９を造成するものであるため、造成される柱状補強
体９の強度が高く、周囲の地盤を非常に強度の高いもの
とすることができ、改良された地盤で大規模な建設工事
が行われた場合でも、造成された柱状補強体９が座屈し
たりせず、建設工事に支障をきたすおそれがない。Further, the above ground improvement method is applied to wet improved soil 8
Before solidifying, the steel pipe pile 10 is driven into the wet modified soil 8 and the wet modified soil 8 is solidified together with the pile to form the columnar reinforcing body 9. The strength is high and the surrounding ground can be made extremely strong, and even when a large-scale construction work is performed on the improved ground, the formed columnar reinforcement 9 does not buckle. , There is no danger of hindering the construction work.
【００１３】さらに、上記地盤改良工法は、鋼管杭１０
が、筒状であるとともに、先端部に螺旋翼１２を設けた
ものであるため、打ち込まれた鋼管杭が、内周、外周、
およびの螺旋翼１２の広い面積に亘って、湿式改良土８
と強固に結合するので、造成される柱状補強体９の強度
が非常に高く、周囲の地盤をきわめて強度の高いものと
することができる。Further, the above ground improvement method is applied to the steel pipe pile 10
However, since it has a tubular shape and the spiral blade 12 is provided at the tip, the driven steel pipe pile has an inner circumference, an outer circumference,
Over the wide area of the spiral wing 12 of and
Since the columnar reinforcing member 9 to be formed has a very high strength, the surrounding ground can be made extremely strong.
【００１４】加えて、上記地盤改良工法は、鋼管杭１０
が、先端に周状のバイト１１を設けたものであるため、
湿式改良土８の中に、鋼管杭１０をスムーズに打ち込む
ことができるので、改良工事を短時間の内に非常に容易
に行うことができる。In addition, the above ground improvement method is used for the steel pipe pile 10
However, since it has a peripheral cutting tool 11 at its tip,
Since the steel pipe pile 10 can be smoothly driven into the wet improved soil 8, the improvement work can be very easily performed within a short time.
【００１５】なお、本発明の地盤改良工法の構成は、上
記した各実施例の態様に何ら限定されるものではなく、
使用する掘削機の種類、使用する材料の種類、使用する
鋼管杭の形状・構造等の構成を、本発明の趣旨を逸脱し
ない範囲で、必要に応じて適宜変更できる。The construction of the ground improvement method of the present invention is not limited to the above-mentioned embodiments.
The configuration of the type of excavator used, the type of material used, the shape and structure of the steel pipe pile used, etc. can be appropriately changed as necessary without departing from the spirit of the present invention.
【００１６】たとえば、上記実施形態においては、セメ
ント含有水を用いてスラリー状の湿式改良土の生成した
が、セメントを含有しない水を乾式改良土に加えてスラ
リー状の湿式改良土を生成することも可能である。な
お、セメントを含有しない水を乾式改良土に加えて湿式
改良土を生成する場合には、乾式改良土を生成する工程
において、現状土に添加するセメント系固化材の配合量
を多くする必要がある。For example, in the above-mentioned embodiment, although the cement-containing water is used to form the slurry-type wet improved soil, water containing no cement is added to the dry-type improved soil to produce the slurry-like wet improved soil. Is also possible. In addition, when water containing no cement is added to dry improved soil to produce wet improved soil, it is necessary to increase the amount of the cement-based solidifying agent added to the existing soil in the step of producing dry improved soil. is there.
【００１７】また、湿式改良土に打ち込む鋼管杭は、上
記実施形態の如く、先端際の外周に螺旋翼を設けたもの
に限定されず、図１２の如く、棒状体を放射状に突出さ
せたもの等に変更することも可能である。さらに、鋼管
杭は、先端際の外周にのみ螺旋翼を設けたものに限定さ
れず、全体に亘って螺旋翼を設けたものや、全体に亘っ
て棒状体を突出させたものでも良い。なお、上記実施形
態の如く、先端際の外周にのみ螺旋翼を設けた場合に
は、鋼管杭の加工コストが安価なものとなる、というメ
リットがある。さらに、鋼管杭は、先端にバイトを連設
したものに限定されず、バイトのないものでも良い。な
お、上記実施形態の如く、先端を鋭角にした周状のバイ
トを鋼管杭の先端に設けた場合には、鋼管杭を非常にス
ムーズに湿式改良土の中に打ち込むことができる、とい
うメリットがある。Further, the steel pipe pile driven into the wet improved soil is not limited to the one in which the spiral blade is provided on the outer periphery at the tip end as in the above embodiment, and the rod-shaped body is radially projected as shown in FIG. It is also possible to change to etc. Further, the steel pipe pile is not limited to the spiral blade provided only on the outer circumference at the tip end, and may be the spiral blade provided over the entire length or the rod-shaped body protruding over the entire length. When the spiral blade is provided only on the outer circumference at the tip as in the above embodiment, there is an advantage that the processing cost of the steel pipe pile becomes low. Further, the steel pipe pile is not limited to the one in which the cutting tool is continuously provided at the tip, and may be one without the cutting tool. As in the above embodiment, when a circumferential cutting tool having an acute tip is provided at the tip of the steel pipe pile, the steel pipe pile can be driven very smoothly into the wet improved soil, which is advantageous. is there.
【００１８】[0018]
【発明の効果】請求項１に記載された地盤改良工法は、
湿式改良土が固化する前に、湿式改良土の中に鋼管杭を
打ち込み、その杭とともに湿式改良土を固化させて柱状
補強体を造成するものであるため、造成される柱状補強
体の強度が高く、周囲の地盤を非常に強度の高いものと
することができ、改良された地盤で大規模な建設工事が
行われた場合でも、造成された柱状補強体が座屈したり
せず、建設工事に支障をきたすおそれがない。The ground improvement method according to claim 1
Before the wet modified soil is solidified, steel pipe piles are driven into the wet modified soil, and the wet modified soil is solidified together with the piles to form the columnar reinforcement, so that the strength of the columnar reinforcement to be formed is It is high and the surrounding ground can be made very strong, and even if large-scale construction work is performed on the improved ground, the constructed columnar reinforcement will not buckle and construction work There is no danger of causing problems.
【００１９】請求項２に記載された地盤改良工法は、鋼
管杭が、筒状であるとともに、少なくとも先端部に螺旋
翼を設けたものであるため、打ち込まれた鋼管杭が、内
周、外周、およびの螺旋翼の広い面積に亘って、湿式改
良土と強固に結合するので、造成される柱状補強体の強
度が非常に高く、周囲の地盤をきわめて強度の高いもの
とすることができる。In the ground improvement method according to the second aspect of the present invention, since the steel pipe pile has a tubular shape and spiral blades are provided at least at the tip, the driven steel pipe pile has inner and outer circumferences. Since the spiral blades of, and are strongly bonded to the wet modified soil over a wide area, the strength of the columnar reinforcing member to be formed is very high, and the surrounding ground can be made extremely strong.
【００２０】請求項３に記載された地盤改良工法は、鋼
管杭が、先端に周状のバイトを設けたものであるため、
湿式改良土の中に、鋼管杭をスムーズに打ち込むことが
できるので、改良工事を短時間の内に非常に容易に行う
ことができる。In the ground improvement method according to the third aspect of the present invention, since the steel pipe pile is provided with the circumferential cutting tool at the tip,
Since the steel pipe pile can be smoothly driven into the wet improved soil, the improvement work can be performed very easily within a short time.
【図１】スクリューオーガーをセッティングする工程を
示す立面図である。FIG. 1 is an elevational view showing a step of setting a screw auger.
【図２】掘削工程および乾式改良土を生成する工程を示
す立面図である。FIG. 2 is an elevational view showing an excavation process and a process for producing dry improved soil.
【図３】掘削が完了した状態を示す立面図である。FIG. 3 is an elevational view showing a state in which excavation is completed.
【図４】乾式改良土を埋め戻す工程を示す立面図であ
る。FIG. 4 is an elevational view showing a process of backfilling dry improved soil.
【図５】乾式改良土を撹拌する工程を示す立面図であ
る。FIG. 5 is an elevational view showing a step of stirring dry improved soil.
【図６】撹拌が完了した状態を示す立面図である。FIG. 6 is an elevational view showing a state where stirring is completed.
【図７】湿式改良土を生成する工程を示す立面図であ
る。FIG. 7 is an elevational view showing a process of producing wet modified soil.
【図８】湿式改良土の生成を完了した状態を示す立面図
である。FIG. 8 is an elevational view showing a state in which generation of wet improved soil has been completed.
【図９】鋼管杭を打ち込む工程を示す立面図である。FIG. 9 is an elevational view showing a step of driving a steel pipe pile.
【図１０】鋼管杭を示す説明図である（なお、（ａ）は
正面図であり、（ｂ）は底面図である）。FIG. 10 is an explanatory view showing a steel pipe pile (note that (a) is a front view and (b) is a bottom view).
【図１１】鋼管杭の打ち込みを完了した状態を示す立面
図である。FIG. 11 is an elevational view showing a state where the driving of the steel pipe pile is completed.
【図１２】鋼管杭の変更例を示す説明図である（なお、
（ａ）は正面図であり、（ｂ）は底面図である）。FIG. 12 is an explanatory diagram showing a modification example of the steel pipe pile (note that
(A) is a front view, (b) is a bottom view).
１・・スクリューオーガー、２・・縦穴、３・・現状
土、４・・セメント系固化材、５・・乾式改良土、６・
・セメントミルク、７・・プラントミキサー、８・・湿
式改良土、９・・柱状補強体、１０・・鋼管杭、１１・
・バイト、１２・・螺旋翼。1 ・ ・ Screw auger 2 ・ ・ Vertical hole 3 ・ ・ Current soil 4 ・ ・ Cement-based solidifying material 5 ・ ・ Dry improved soil 6 ・
・ Cement milk, 7 ・ ・ Plant mixer, 8 ・ ・ Wet modified soil, 9 ・ ・ Columnar reinforcement, 10 ・ ・ Steel pipe pile, 11 ・
・ Bite, 12 ...
Claims (3)
穴を形成し、掘削した現状土にセメント系固化材を混合
して乾式改良土を生成し、乾式改良土と水またはセメン
ト含有水とを縦穴内でスクリューオーガーにより混練し
てスラリー状の湿式改良土を生成し、その湿式改良土を
固化させることによって地中に柱状補強体を造成する地
盤改良工法であって、 前記湿式改良土が固化する前に、湿式改良土の中に鋼管
杭を打ち込み、その杭とともに湿式改良土を固化させて
柱状補強体を造成することを特徴とする地盤改良工法。1. A vertical hole is formed by excavating the ground with a screw auger, and a cement-based solidifying material is mixed with the excavated current soil to generate dry improved soil, and the dry improved soil and water or cement-containing water is vertically drilled. A soil improvement method for forming a columnar reinforcing member in the ground by kneading with a screw auger to produce a wet improved soil in the form of a slurry, and solidifying the wet improved soil, wherein the wet improved soil is solidified. First, a ground improvement method characterized in that a steel pipe pile is driven into the wet modified soil and the wet modified soil is solidified together with the pile to form a columnar reinforcement.
とも先端部に螺旋翼を設けたものであることを特徴とす
る請求項１に記載の地盤改良工法。2. The ground improvement method according to claim 1, wherein the steel pipe pile has a tubular shape and at least a tip end thereof is provided with a spiral blade.
ものであることを特徴とする請求項１、または請求項２
に記載の地盤改良工法。3. The steel pipe pile according to claim 1, wherein the steel pipe pile is provided with a peripheral cutting tool at its tip.
Ground improvement method described in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001195287A JP2003003462A (en) | 2001-06-27 | 2001-06-27 | Soil stabilization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001195287A JP2003003462A (en) | 2001-06-27 | 2001-06-27 | Soil stabilization method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003003462A true JP2003003462A (en) | 2003-01-08 |
Family
ID=19033293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001195287A Pending JP2003003462A (en) | 2001-06-27 | 2001-06-27 | Soil stabilization method |
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| Country | Link |
|---|---|
| JP (1) | JP2003003462A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010133114A (en) * | 2008-12-03 | 2010-06-17 | Asahi Kasei Construction Materials Co Ltd | Piling method accompanying soil improvement |
| JP2010163842A (en) * | 2009-01-19 | 2010-07-29 | Jutaku Jiban Kk | Soil improving method |
| CN108193670A (en) * | 2017-12-20 | 2018-06-22 | 中冶天工集团有限公司 | A kind of concrete prefabricated screw pile and its construction method |
-
2001
- 2001-06-27 JP JP2001195287A patent/JP2003003462A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010133114A (en) * | 2008-12-03 | 2010-06-17 | Asahi Kasei Construction Materials Co Ltd | Piling method accompanying soil improvement |
| JP2010163842A (en) * | 2009-01-19 | 2010-07-29 | Jutaku Jiban Kk | Soil improving method |
| CN108193670A (en) * | 2017-12-20 | 2018-06-22 | 中冶天工集团有限公司 | A kind of concrete prefabricated screw pile and its construction method |
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