JPS60148918A - Method of building synthesized pile - Google Patents
Method of building synthesized pileInfo
- Publication number
- JPS60148918A JPS60148918A JP488384A JP488384A JPS60148918A JP S60148918 A JPS60148918 A JP S60148918A JP 488384 A JP488384 A JP 488384A JP 488384 A JP488384 A JP 488384A JP S60148918 A JPS60148918 A JP S60148918A
- Authority
- JP
- Japan
- Prior art keywords
- pile
- ground
- soft ground
- improving agent
- piles
- 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
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Piles And Underground Anchors (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は軟弱地盤上に建設される構築物のＵ礎築迄方法
、特に軟弱地盤中に合成杭を構築する方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing a foundation for a structure constructed on soft ground, and particularly to a method for constructing a composite pile in soft ground.
軟弱地盤上の＠築物を杭に支持すること、又は構築物の
基礎地盤を改良することは広く採用されている。この杭
による構築物の支持工法どしては、場所口ら抗による場
合ど鋼管杭、二Ｉンクリー１〜杭等の既製杭を打設置す
る工法とが知られている。このうち場所打ち杭による場
合は騒音、振動等の問題は比較的少いが＋Ａの支持力の
信頼性にやや問題が６うり、また＠製杭による場合は月
讐が均一で杭として信頼性が大きいがｇ音、振動及び支
持力が比較的小さいという問題がある。Supporting structures on soft ground with piles or improving the foundation ground for structures has been widely adopted. As a construction method for supporting a structure using piles, there is known a construction method in which ready-made piles such as steel pipe piles and two-in-one concrete piles are driven and installed from the ground. Among these, when using cast-in-place piles, there are relatively few problems such as noise and vibration, but there are some problems with the reliability of the bearing capacity of +A, and when using @made piles, the thickness is uniform and the piles are reliable. However, there are problems in that the g-noise, vibration, and supporting force are relatively small.
イこで、近年、軟弱地盤をアースオーカーで掘削し、１
１ｉ′ｉ！削孔にヒメントミルクヤ）レノン１−モルタ
ルを注入した後、それらの未固結状態で既製杭を打設し
て軟弱地盤中に合成杭を横築し−（地盤改良を １１
°う 工 ン人 （特 聞 ｕｒｌ ５ ７ −− ５
１ ３ ３ ２ ｇ 公 報 ’Ｊ Ｐ、ｆｌ’、）
や、軟弱地盤をアースオーカーで掘削しつつ１１１ｆ
ｔ’ｉ抗又は中空コクリート杭を軟弱地盤中に立込み、
アースオー刀一を引抜く際にアースオーカーの光幅；部
にリセメン（・ミルクを）を人して原位置上と攪拌混合
Ｊることにより、軟弱地盤中に鋼Ｖ（又は＝１ンクリー
ト杭を構築する丁Ｔム（特開昭５５−１１９８２０８公
ＩＩｌ参照）が（ＩＪ！寮された。In recent years, soft ground has been excavated with earth ocher, and
1i′i! After injecting mortar into the drilled hole, ready-made piles were driven in their unconsolidated state, and synthetic piles were laterally constructed in the soft ground.
°Worker (Special URL 5 7 -- 5
1 3 3 2 g Publication 'JP, fl',)
111F while excavating soft ground with earth ocher.
Install a t'i pit or hollow cochleit pile into soft ground,
When pulling out the Earth Ocher, add resemene (milk) to the light width part of the Earth Ocher and stir and mix it with the original position to place a steel V (or = 1 concrete pile) in the soft ground. The construction of Ding Tmu (see Japanese Unexamined Patent Publication No. 55-1198208) was (IJ! dormitory).
これ等の公報によれば、用所打ち杭に比べて祠賀の均一
な杭を地盤中に構築でき、また改良の貫入時に原地盤上
を攪拌すること又は一部排土する方法を採れば、＠製杭
を直接打設する場合のような騒音、振動の問題も比較的
少い。According to these publications, it is possible to construct piles with uniformity in the ground compared to cast-in-place piles, and if a method of stirring the original ground or partially discharging the earth during penetration of improvement is adopted. There are also relatively few noise and vibration problems, such as when directly driving piles.
しかしながら、前者の二り法による場合には掘削土を１
１Ｆ十づる必要があり、抗の沈下量も比較的大ぎくまた
後者の工法による場合は元位置上の一部を改良材と混合
することによりソイルコンクリートとして利用している
ので掘削土の排１の問題は比較的少いが、改良材として
セメントミルクのようなスラリを使用しているため元位
置上との混合が必ずしも充分に行われず、かつ所定の強
酸を得るには比較的多聞のスラリ状改良材を要するとい
う問題があった。However, in the case of the former two methods, the excavated soil is
1F is required, and the amount of sinking of the shaft is relatively large.In addition, when using the latter method, a part of the original position is used as soil concrete by mixing it with improvement material, so it is difficult to dispose of the excavated soil. The problem is relatively small, but since a slurry such as cement milk is used as the improving material, it is not always sufficiently mixed with the original material, and it takes a relatively large amount of slurry to obtain the desired strong acid. There was a problem in that a condition improving material was required.
本発明者らは種々の研究実験の結果、粉体噴射攪拌工法
の名で知られている地盤改良工法でもって軟弱地盤中に
改良柱体を形成し、該改良柱体の未固結状態で改良柱体
中に既製杭を打設することにより、比較的少量の粉粒体
の地盤改良材でもって品質にばらつきがなく、かつ強度
の大きな合成杭を軟弱地盤中に構築づることが（・き、
軟弱地盤にの構築物４４礎抗として好適であることを見
出した。As a result of various research experiments, the present inventors formed improved pillars in soft ground using a ground improvement method known as the powder injection stirring method, and found that the unconsolidated state of the improved pillars By driving ready-made piles into improved columns, it is possible to construct synthetic piles with consistent quality and high strength in soft ground using a relatively small amount of granular ground improvement material. tree,
It has been found that it is suitable as a foundation shaft for a structure 44 on soft ground.
本発明によれば、駆動装置により軟弱地盤に攪拌翼を員
入り、所定の深度掘削し終えたら中空攪拌軸の先端部よ
り空気流にＪ、り粉粒体の地盤へ１ｎ材を噴射（〕て回
回転量を介して中空１ｕ拌軸先端部に設けた攪拌翼によ
り原位置上と攪拌混合しつつ中空攪拌軸を引扱くことに
より軟弱地盤中に改良（）体を形成し、該改良柱体の未
固結状態においτ改自柱体中に既製杭を打設して軟弱地
盤中に基礎杭を４１１’！＊ ’Ｉる方法が提供されて
いる。According to the present invention, a stirring blade is inserted into the soft ground by a drive device, and after excavation to a predetermined depth is completed, 1N material is injected into the powdery ground from the tip of the hollow stirring shaft using an air flow. By handling the hollow stirring shaft while stirring and mixing with the original position using the stirring impeller installed at the tip of the hollow 1U stirring shaft through the amount of rotation, an improved body is formed in the soft ground, and the improvement is A method is provided for driving ready-made piles into the τ modified self-column in the unconsolidated state of the column to install foundation piles in soft ground.
地盤改良材としては、粉体材料のセメント、生石灰が好
適に１史用でさるが、粒径５ ｍｍ＋ヌ下で空気流で噴
口４できるものであれば他の粉粒体の地盤改良材も使用
りることができる。Powder materials such as cement and quicklime are suitable for use as ground improvement materials, but other powder and granule soil improvement materials can also be used as long as they have a particle size of 5 mm or less and can be formed with an air flow. It can be used.
このｊｚうに本発明では、地盤改良材として粉粒体の地
盤改良材を使用していることと、攪拌翼の機構」１少い
攪拌回数でもって充分な原位置上との混合がなされ、比
較的少量の地盤改良材でもって０質の均一な、かつ抗力
の大きい合成杭が軟弱地盤中に好適に構築できる。According to the present invention, a granular ground improvement material is used as the soil improvement material, and the stirring blade mechanism 1 allows for sufficient in-situ mixing with a small number of stirrings. Synthetic piles with zero quality, uniformity, and high resistance can be suitably constructed in soft ground using a targeted amount of ground improvement material.
以下、図面を参照して本発明の工法の手順の一例を説明
する。Hereinafter, an example of the procedure of the construction method of the present invention will be explained with reference to the drawings.
自走式のベースマシン１を動かして軟弱地盤Ａ中に合成
杭を構築する個所の位置決めを行う（第１図イ）。次い
でベースマシン１のＩ６２より吊下げられた中空攪拌軸
３を地盤Ａに買入する（第１図日）、。The self-propelled base machine 1 is moved to determine the location where the composite pile will be constructed in the soft ground A (Fig. 1A). Next, the hollow stirring shaft 3 suspended from I62 of the base machine 1 is purchased on the ground A (day in Figure 1).
地盤改良機本体としては粉体噴躬醍１’ｌ’ ：ｒ法で
使用されている従来公知の地盤改良機を使用することが
でき、その−例を第２図に示す。As the main body of the soil improvement machine, a conventionally known soil improvement machine used in the powder injection method 1'l':r method can be used, an example of which is shown in FIG.
攪拌翼に回転力を与えると共に粉粒体の地９Ｂ改良材を
空気流によって供給するための中空攪拌軸３の先端には
超硬チップ１１を備えた下段攪拌翼１２が設けられてい
る。下段攪拌１１２よりもやや上方には上段攪拌翼１３
が設けられていて上段攪拌翼１３に囲われるようにして
中空撹拌軸３にね粒体の地盤改良材の噴射口１４が形成
されている。A lower stirring blade 12 equipped with a carbide tip 11 is provided at the tip of the hollow stirring shaft 3 for applying rotational force to the stirring blade and supplying the granular soil improving material by air flow. Slightly above the lower stirring blade 112 is an upper stirring blade 13.
is provided, and an injection port 14 for the ground improvement material in the form of granules is formed in the hollow stirring shaft 3 so as to be surrounded by the upper stage stirring blades 13.
図示されていない駆動源により中空攪拌軸３を回転ざぜ
、攪拌Ｆ！１２．１３で軟弱地盤Ａを切削し、所定の深
度貫入Ｊる。具入完了（第１図ハ）。The hollow stirring shaft 3 is rotated by a drive source (not shown), stirring F! 12. In step 13, cut the soft ground A and penetrate to a predetermined depth. Filling is complete (Fig. 1 C).
真人を完了すれば中空攪拌軸３を引抜くとバに、粉粒体
の地盤改良材を噴射して軟弱ＪＩ！Ｉ盤Ａ中に改良柱体
Ｃを形成していく（第１Ｎ：）。Once the process is completed, pull out the hollow stirring shaft 3 and spray the ground improvement material in the form of powder and granules to create a soft JI! Improved column C is formed in I board A (1st N:).
第３図にての一例を示し、地表に１ｌｒＪ出防１１カバ
ー１５を被わせ、中空１ｕ拌幀３を回転しつつ中空攪拌
軸３を通して空気流により粉オＩ′を体の地盤改良材を
昭送し、噴口１０１４より元位ｋＺ −ｔ、 Ｂ中に噴
口・１りる。元悦ｚ１士Ｂ中に噴０・１された粉粒体の
地盤改良材は回転する攪１’ｌ’ Ｍ １２．１３によ
り１冒拌され元（ｉｌｌ ＷＪ 、：Ｌ １３と混合さ
れる。改良材と分前した空気は中空攪拌軸３と上との間
の間隙を通って地表に流出し、噴出防市カバー１５に設
（“ｌた排気［１１６−より外部に流出する。An example is shown in Fig. 3, where the ground surface is covered with the 1lrJ protection 11 cover 15, and the powder I' is applied to the ground improvement material by air flow through the hollow stirring shaft 3 while rotating the hollow 1u stirring shaft 3. As the flow progresses, the jet nozzle 1014 enters the base kZ-t, B. The ground improvement material in the form of powder and granules injected into the Yuan Yue Z1 B is agitated by the rotating agitator 1'l' M 12.13 and mixed with the original (ill WJ, :L 13). The air mixed with the improving material flows out to the ground through the gap between the hollow stirring shaft 3 and the top, and flows out through the exhaust air [116-] installed in the blowout prevention cover 15.
中空＋１２拌輔３引扱ぎ完了（第１図ホ）、、これによ
り軟弱地盤△中に改良柱体Ｃが形成される。この改１ミ
柱体Ｃは粉粒体の地盤改良材が上申の含水（含水比例え
ば６０％）により化学反応することにより固結するが、
固結する以前の未固結状態において改良柱体Ｃ中に既製
杭りを打設覆る。The handling of the hollow +12 stirrer 3 is completed (Fig. 1 E), and as a result, the improved column C is formed in the soft ground △. This modified 1-millimeter C is solidified by a chemical reaction between the powder and granular ground improvement material due to its water content (water content ratio, for example, 60%).
Ready-made piles are driven into the improved column C in an unconsolidated state before consolidation.
軟弱地ＭＡ中に改良柱体Ｃを形成し終えればベースマシ
ン１を移動させ、杭打機械４で既製杭りを吊下げて改良
柱体Ｃ中へ降ろし、ハンマーを利用して既製杭りを改良
柱体Ｃ中に打設する（第１図へ）。既製杭りの立込みが
完了すると（第１図ト）、既製杭りと改良柱体Ｃとによ
り軟弱地盤Ａ中に合成杭［が構築される。After forming the improved column C in the soft ground MA, move the base machine 1, hang the ready-made piles with the pile driving machine 4 and lower them into the improved column C, and use a hammer to remove the ready-made piles. into the improved column C (see Figure 1). When the erection of the ready-made piles is completed (Fig. 1G), a composite pile is constructed in the soft ground A using the ready-made piles and the improved column C.
既製杭としては鋼管杭、コンクリート抗、鋼袷コンクリ
ート合成杭等いずれであってもよい。また軟弱地５１ｇ
Ａ中への合成杭Ｅの構築の仕方としては、第１図（ト）
に示すように既製杭のほぼ全長にわたって改良地盤が取
り巻くようにしても、比較的下部だけを取り巻くように
しても（第４図イ）、比較的上部だけを取り巻くように
（）ても（第４図口）、また中間を除いて上部と下部を
取り巻く（第４図へ）ようにしてもよい。The ready-made piles may be steel pipe piles, concrete piles, steel-clad concrete composite piles, or the like. In addition, 51g of soft ground
The method of constructing composite pile E in A is shown in Figure 1 (G).
As shown in Figure 4, the improved soil can surround almost the entire length of the prefabricated pile, it can surround only the relatively lower part (Figure 4 A), or it can surround only the relatively upper part (Figure 4). (Fig. 4), or may be arranged so as to surround the upper and lower parts except for the middle (see Fig. 4).
下記の内容で試験を行った。The test was conducted with the following contents.
試験地質は、表土、ローム（３ｍ）、砂質シルト（１，
５ｍ＞、粘質シルト（５ｍ）、中砕（５゜５ｍ）、砂礫
の拵（６層
試験杭の配置は第５図の通りてあり、［では改良柱体、
Ｓは鋼管杭、王はアンカーを示し、また１−【ま水平試
験杭、Ｍｌま鉛ｊ″−Ｊ試験抗、Ｎは水甲反力抗を示づ
。抗間隔は２００ Ｃｌ１１．アンカー間隔は４００ｃ
ｍである。The test geology was topsoil, loam (3m), sandy silt (1,
5m>, cohesive silt (5m), medium crushed (5゜5m), sand and gravel pile (the arrangement of the 6-layer test pile is shown in Figure 5;
S indicates a steel pipe pile, KING indicates an anchor, 1-[Mahorizontal test pile, Ml lead j''-J test pit, N indicates water shell reaction force resistance. 400c
It is m.
第６図に試験結果による荷重−沈下１ｄ曲線を示し、沈
下呈が小さく好結果が得られた。Figure 6 shows a load-settlement 1d curve based on the test results, and good results were obtained with small settlement.
以！−の実験結果かられかるように、本発明の工法にに
れば鉛直効力および水平効力の大きい合成杭針軟弱地盤
中に構築覆ることかてぎ、軟弱地盤の杭基礎工法とｌ）
で好適な工法であるということが１さ′る。Here it is! - As can be seen from the experimental results of the present invention, synthetic piles with large vertical and horizontal effects can be constructed and covered in soft ground.
It is believed that this is a suitable construction method.
第１図（イ）ないしくト）は本発明に１系る合成杭によ
る地盤改良工法の施］−手順を示し、（イ）は位同決め
、（ロ）は中空１ｉｆｔ Ｉｆ軸の地盤真人、（ハ）は
貴人完了、（ニ）は中空攪拌軸の引扱き、（ホ）は中空
攪拌軸の引１ムき完了、（へ）は既製杭のｔ］設、（ト
）は既製杭の立込み完了の各Ｉ−ｊ程図である。第２図
は本発明に係る粉体噴６４攪拌Ｔ法を実施するために使
用づ−る攪拌翼の一例を示１−正面である。第３図は粉
粒体の地盤改良材を元位置−１−ど撹拌混合して軟弱地
盤中に改良柱体を構築する状態を示す説明図である。第
４図（イ）ないしくハ）は本発明に係る工法によって構
築しＩこ合成杭の各種の一部を断面で示す正面図である
。第５図は試験に供した杭間隔を示す一部６図は試験結
果を示す荷車−沈下吊曲線図である。
３・・・中空攪拌軸 １１・・・超硬チップ １２・・
・下段攪拌翼 −１３・・・上段攪拌翼 １４・・・改
良材噴射口 １５・・・噴出防止カバー １６・・・排
気口 Ａ・・・軟弱地ｇ Ｂ・・・掘削された元荀置土
Ｃ・・・改良柱体 Ｄ・・・既製杭 Ｅ・・・合成杭
表−１
（イ） （ロ） （ハ）
（（
Ａ Ａ
（へ）（））
し
嬉１図
第３０
（イ） （ロ） （ハ）
＆τ５ＩＩＪFigures 1 (A) to (G) show the procedure for carrying out the soil improvement method using one system of synthetic piles according to the present invention, (A) shows the position determination, and (B) shows the ground alignment of the hollow 1if axis. , (C) is completed by Takashi, (D) is the handling of the hollow stirring shaft, (E) is the completion of pulling the hollow stirring shaft, (F) is the installation of the ready-made pile, and (G) is the ready-made pile. It is each I-j process diagram of the completion of stand-up. FIG. 2 shows an example of an agitation blade used to carry out the powder injection 64 agitation T method according to the present invention. FIG. 3 is an explanatory diagram showing a state in which improved pillars are constructed in soft ground by stirring and mixing the ground improvement material in the form of powder and granules in the original position-1. FIGS. 4(a) to 4(c) are front views showing cross-sections of various types of composite piles constructed by the construction method according to the present invention. Fig. 5 shows the distance between the piles used in the test, and Fig. 6 shows the cart-settlement suspension curve showing the test results. 3...Hollow stirring shaft 11...Carbide tip 12...
・Lower stage stirring blade -13... Upper stage stirring blade 14... Improved material injection port 15... Splash prevention cover 16... Exhaust port A... Soft ground g B... Excavated former site Soil C: Improved column D: Ready-made pile E: Composite pile table-1 (A) (B) (C) ((A A (Go) ()) ) (b) (c) &τ5IIJ
Claims (1)
の深喰掘削し終えたら中空攪拌軸の先端部より空気流に
より粉粒体の地盤改良材を噴射Ｌノで回転装置を介して
中空攪拌軸先端部に設けた撹拌翼により原位防土と攪拌
混合しつつ中空攪拌軸を引抜くことにより軟弱地盤中に
改良柱体を形成し、該改良柱体の未固結状態において改
良柱体中に既製杭を打設して軟弱地盤中に基礎杭を構築
づることを特徴とする合成杭の築造方法。A stirring blade is inserted into the soft ground using a driving fiJl device, and after the specified deep excavation is completed, a ground improvement material in the form of powder is injected by an air flow from the tip of the hollow stirring shaft. An improved column is formed in the soft ground by pulling out the hollow stirring shaft while stirring and mixing with the original soil protection using a stirring blade installed at the tip of the stirring shaft. A method for constructing a composite pile, characterized by driving a ready-made pile into the body and constructing a foundation pile in soft ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP488384A JPS60148918A (en) | 1984-01-17 | 1984-01-17 | Method of building synthesized pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP488384A JPS60148918A (en) | 1984-01-17 | 1984-01-17 | Method of building synthesized pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60148918A true JPS60148918A (en) | 1985-08-06 |
| JPH0216815B2 JPH0216815B2 (en) | 1990-04-18 |
Family
ID=11596073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP488384A Granted JPS60148918A (en) | 1984-01-17 | 1984-01-17 | Method of building synthesized pile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60148918A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0396513A (en) * | 1989-09-07 | 1991-04-22 | Doboku Kenkyu Center | Improvement method of ground |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56142923A (en) * | 1980-04-04 | 1981-11-07 | Takechi Koumushiyo:Kk | Construction of foundation pile and case auger used therefor |
| JPS56153012A (en) * | 1980-04-25 | 1981-11-26 | Takashi Takeshita | Creation of agitated mixing pile for poor subsoil |
-
1984
- 1984-01-17 JP JP488384A patent/JPS60148918A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56142923A (en) * | 1980-04-04 | 1981-11-07 | Takechi Koumushiyo:Kk | Construction of foundation pile and case auger used therefor |
| JPS56153012A (en) * | 1980-04-25 | 1981-11-26 | Takashi Takeshita | Creation of agitated mixing pile for poor subsoil |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0396513A (en) * | 1989-09-07 | 1991-04-22 | Doboku Kenkyu Center | Improvement method of ground |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0216815B2 (en) | 1990-04-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |