JPH03166417A - Ground improving method and drilling auger to be used - Google Patents
Ground improving method and drilling auger to be usedInfo
- Publication number
- JPH03166417A JPH03166417A JP30505489A JP30505489A JPH03166417A JP H03166417 A JPH03166417 A JP H03166417A JP 30505489 A JP30505489 A JP 30505489A JP 30505489 A JP30505489 A JP 30505489A JP H03166417 A JPH03166417 A JP H03166417A
- Authority
- JP
- Japan
- Prior art keywords
- auger
- excavation
- excavated
- water
- drilling
- 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
- 238000000034 method Methods 0.000 title claims description 22
- 238000005553 drilling Methods 0.000 title abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 210000000078 claw Anatomy 0.000 claims abstract description 19
- 239000002689 soil Substances 0.000 claims description 40
- 238000009412 basement excavation Methods 0.000 claims description 32
- 238000003756 stirring Methods 0.000 claims description 29
- 238000007711 solidification Methods 0.000 claims description 18
- 230000008023 solidification Effects 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 abstract description 4
- 239000012258 stirred mixture Substances 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000007613 slurry method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は,地盤改良工法およびこの工法に用いる掘削
オーガに関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a ground improvement method and an excavating auger used in this method.
軟弱地盤等を強化する地盤改良工法として,地中に穴を
掘削し,この掘削穴に地盤改良固化材(以下,固化材と
いう〉を投入して円柱状の硬化体を造戒する方法がある
。As a ground improvement method to strengthen soft ground, etc., there is a method of drilling a hole in the ground and pouring a soil improvement solidification material (hereinafter referred to as solidification material) into the excavated hole to create a cylindrical hardened body. .
これには固化材をスラリー状にして注入し,これを攪拌
混合して硬化体に造或するスラリー工法があるが,この
工法は専用の固化材供給プラントや大型の施工機械を必
要とする等の問題がある。There is a slurry method for this, which involves injecting a solidifying material into a slurry and stirring and mixing it to form a hardened material, but this method requires a dedicated solidifying material supply plant and large construction machinery. There is a problem.
一方,特開昭61− 40919号等に見られるような
掘削オーガで掘削や攪拌および締固めを行わせる,いわ
ゆる,フィルパイル工法と呼ばれるものがある。On the other hand, there is a so-called fill pile method, which uses an excavating auger to perform excavation, stirring, and compaction, as seen in Japanese Patent Application Laid-Open No. 61-40919.
このフィルパイル工法は掘削オーガの回転を地盤の掘削
だけでなく.掘削土と固化材の攪拌混合にも利用できる
利点があるが,一度に大量の攪拌混合はできないため,
掘削土を一度地上に排土し.ここで攪拌混合して再度掘
削穴に埋戻しをしなければならないから.多くの作業人
員を要する.さらに.この工法では水を一切使用しない
から,固化材と掘削土の攪拌混合の際に発生する空気が
硬化体の内部に気泡となって残留し,強度を低下させる
問題があった。This fill pile construction method uses the rotation of the excavation auger not only to excavate the ground. It has the advantage that it can also be used to stir and mix excavated soil and solidification material, but it is not possible to stir and mix a large amount at once.
The excavated soil is once removed to the ground. At this point, the material must be stirred and mixed and the excavated hole must be backfilled. It requires a large number of workers. moreover. Since this method does not use any water, the problem is that the air generated when the solidification material and excavated soil are stirred and mixed remains in the form of bubbles inside the hardened material, reducing its strength.
この発明は,このような課題を解決するものであって,
その目的とする処は.作業が省力的で,かつ.造成した
硬化体が高強度である地盤改良工法およびこれに用いる
掘削オーガを提供するものである。This invention solves these problems, and
What is its purpose? Work is labor-saving, and. The present invention provides a ground improvement method in which the created hardened body has high strength, and an excavation auger used therein.
以上の課題の下,この発明は,
[1]、下記第一工程〜第四工程からなる地盤改良工法
。In view of the above-mentioned problems, the present invention provides: [1] A ground improvement method comprising the following first to fourth steps.
掘削オーガを作動させて設定掘削深さの略半分を掘削し
,掘削土を地上に排土する第一工程第一工程で掘削した
掘削穴に地盤改良固化材および必要に応じて少量の水を
投下し.掘削オーガを作動させて設定掘削深さの残り半
分を掘削するとともに,掘削土と地盤改良固化材および
水を攪拌混合する第二工程
第二工程において掘削土,地盤改良固化材および水を攪
拌混合したものを掘削オーガを作動させて締固め,円柱
状の混練体に造成する第三工程第三工程で造成した混練
体の上に第一工程で排土した掘削土の一部,地盤改良固
化材および水を投下し,これらを掘削オーガを作動させ
て攪拌混合した後に締固めて円柱状の混練体として積重
する操作を数回に分けて行う第四工程
[2]、掘削オーガの先端近くの螺旋鍔部に撹拌爪を取
付けてなる前記の記載の地盤改良工法に用いる掘削オー
ガ。Activate the excavation auger to excavate approximately half of the set excavation depth, and discharge the excavated soil to the ground. 1st step. Add soil improvement solidification material and a small amount of water as necessary to the excavated hole that was excavated in the 1st step. Drop it. The excavation auger is operated to excavate the remaining half of the set excavation depth, and the excavated soil, soil improvement solidification material, and water are stirred and mixed in the second step.In the second step, the excavated soil, soil improvement solidification material, and water are stirred and mixed. The excavated soil is compacted by operating an excavation auger to form a cylindrical kneaded body. The third step is to place a portion of the excavated soil that was excavated in the first step on top of the kneaded material created in the third step, for soil improvement and solidification. The fourth step [2] involves dropping wood and water, stirring and mixing them by operating an excavation auger, compacting them, and stacking them into a cylindrical kneaded body in several steps [2]. An excavating auger used in the ground improvement method described above, which has a stirring claw attached to a nearby spiral collar.
をそれぞれ提供したものである.
〔作用〕
以上の■における第一工程により,地中に設定掘削深さ
の略半分の深さの掘削穴が形威され,このときの掘削土
は地上に排土される。また,第二工程により.掘削穴は
設定深さまで堀下げられるとともに,投下された固化材
,少量の水および掘削土を攪拌混合する。さらに.−第
三工程により,これら攪拌混合されたものを締固め,掘
削穴に混練体として造或する。そして,第四工程により
,この混練体の上に地上に排土されていた掘削土.固化
材,水等を投下し,これらを攪拌混合して混練体とする
とともに,この混練体を下方の混練体の上に逐次M重し
て行く。これらの全工程が終了すると,掘削穴には等質
の混練体が造成されることになる。なお,この混練体は
時間が経過すると固化し.円柱状の硬化体となる。are provided respectively. [Operation] Through the first step in step (2) above, an excavated hole is formed in the ground to a depth approximately half of the set excavation depth, and the excavated soil at this time is discharged to the ground. Also, due to the second step. The excavated hole is dug to the set depth, and the dropped solidification material, a small amount of water, and the excavated soil are stirred and mixed. moreover. - In the third step, the stirred mixture is compacted and formed into a kneaded body in the excavated hole. Then, in the fourth step, the excavated soil was discharged onto the ground on top of this kneaded material. A solidifying agent, water, etc. are dropped, and these are stirred and mixed to form a kneaded body, and this kneaded body is successively piled M on top of the kneaded body below. When all these steps are completed, a homogeneous kneaded body will be created in the drilled hole. Note that this kneaded material solidifies over time. It becomes a cylindrical hardened body.
次に,前記■の掘削オーガを使用すれば,これに装着さ
れた撹拌爪によって掘削土,固化材および水の攪拌混合
がより十分に,かつ,完全に行われる。Next, if the excavation auger of (1) is used, the agitation claws attached to the auger will more thoroughly and completely stir and mix the excavated soil, solidification material, and water.
以下,この発明の実施例を図面を参照して説明する.
第2図はこの工法に用いる掘削オーガを装備した土工機
械の側面図,第3図は掘削オーガの側面図であるが,こ
の工法は生軸1の周囲に螺旋鍔部2を装設した掘削オー
ガ3を使用する。なお.掘削オーガ3の先端には通常掘
削爪4が装着されている。このような掘削オーガ3を土
工燗械5のメインビーム6に油圧モータ7を介して装着
する。Examples of the present invention will be described below with reference to the drawings. Figure 2 is a side view of an earthmoving machine equipped with an excavation auger used in this construction method, and Figure 3 is a side view of the excavation auger. Use Auger 3. In addition. A digging claw 4 is usually attached to the tip of the digging auger 3. Such an excavation auger 3 is attached to a main beam 6 of an earthmoving machine 5 via a hydraulic motor 7.
ところで,この土工機械5は狭くて軟弱な地盤の個所で
も作業ができるように,少なくとも,クローラ型の走行
装置8と,掘削土を埋戻すためのドーザ9を装備してい
るものが望ましい。さらに,この掘削オーガ3には撹拌
爪10が装備される。この撹拌爪10は先鋭なビン状の
主体10aの後端にネジ部10b等が形威されたもので
あって,先端の掘削爪4に後続する螺旋鍔部2に2〜3
ケ所着脱自在に取付けられる。なお,着脱自在としたの
は通常使用のときには取外しができるようにするためで
ある。By the way, this earth-moving machine 5 is preferably equipped with at least a crawler-type traveling device 8 and a dozer 9 for backfilling excavated soil so that it can work even in narrow places with soft ground. Furthermore, this excavating auger 3 is equipped with a stirring claw 10. This stirring claw 10 has a sharp bottle-shaped main body 10a with a threaded portion 10b etc. formed at the rear end, and has two to three threaded parts on a spiral collar 2 following the digging claw 4 at the tip.
Can be removably installed in several places. The reason why it is made detachable is that it can be removed during normal use.
第1図はこのような掘削オーガ3を使用する地盤改良工
法の工程図であるが,まず,掘削しようとする地点に掘
削オーガ3を位置決めし,油圧モータ7を駆動して堀削
オーガ3を正回転させ,地中に設定掘削深さHの略半分
の掘削穴11を掘削する。このとき出る掘削土12は掘
削オーガ3を正逆回転させながら上下動させることによ
り,地上に排土する(第一工程)。次に.掘削オーガ3
を正逆回転および上下動させて残り半分を掘削して設定
掘削深さHの掘削穴11にするとともに,これに固化材
13および必要ならば少量の水14を添加し、掘削土1
2と攪拌混合する(第二工程)。なお,ここでの固化材
13にはセメント系と石灰系とがあり,一般に市販され
ているから,それを使用すればよい。ところで,この第
二工程で掘削土12を地上に排土することなく,掘削穴
11中で固化材13や水14と十分に攪拌混合できるの
は,掘削オーガ3に撹拌爪10が装着されていることと
,上半分の掘削土l2を地上に排土し,掘削穴11中の
掘削土12の量が少ないからである。さらに,掘削穴1
1の下方の掘削土12は水分の多い粘土質となっている
から,ここで加える水14については必要な場合だけ添
加すればよい。掘削土12と固化材13等が十分に混合
されたなら.今度は掘削オーガ3を正逆回転および上下
動させてこれら攪拌混合したものを締固め,掘削穴11
の下半分に円柱状の混練体15として造戒する(第三工
程)。第三工程が終了したなら,第一工程で地上に排土
されていた掘削土12の一部と固化材13および水14
を掘削穴11中の既に造成された混練体15の上に投下
し.掘削オーガ3を正逆回転および上下動させてこれら
を攪拌混合した後に締固め,同じく円柱状の混練体15
にして積重する。このような操作を逐次繰り返し,すべ
ての掘削土12を混練体15として掘削穴II中に一本
の等質の混練体15として造戒する(第四工程)。なお
,この混練体15は時間が経過すると硬化体となって地
盤を強化するものとなる。ところで,第四工程における
掘削土12の投下作業を土工機械5に装備されているド
ーザ9で行うとすれば,小人数(1〜2名)ででき,短
時間で処理できる。FIG. 1 is a process diagram of the ground improvement method using such an excavating auger 3. First, the excavating auger 3 is positioned at the point to be excavated, and the hydraulic motor 7 is driven to move the excavating auger 3. Rotate in the forward direction to excavate an excavation hole 11 approximately half of the set excavation depth H into the ground. The excavated soil 12 that comes out at this time is discharged onto the ground by moving the excavation auger 3 up and down while rotating it forward and backward (first step). next. drilling auger 3
The remaining half is excavated by rotating forward and backward and moving up and down to form an excavated hole 11 with a set excavation depth H. A solidifying material 13 and a small amount of water 14 are added to this, if necessary, to form the excavated soil 1.
Stir and mix with 2 (second step). Note that the solidifying material 13 here includes cement-based and lime-based, which are generally commercially available, and may be used. By the way, the reason why the excavated soil 12 can be sufficiently stirred and mixed with the solidifying material 13 and water 14 in the excavated hole 11 without being discharged to the ground in this second step is because the agitating claw 10 is attached to the excavating auger 3. This is because the upper half of the excavated soil l2 is discharged onto the ground, and the amount of excavated soil 12 in the excavated hole 11 is small. Furthermore, drilling hole 1
Since the excavated soil 12 below 1 is clay with a high moisture content, the water 14 to be added here only needs to be added when necessary. Once the excavated soil 12 and solidification material 13 are sufficiently mixed. Next, the drilling auger 3 is rotated forward and backward and moved up and down to compact the stirred mixture and drill the hole 11.
A cylindrical kneaded body 15 is formed in the lower half of the kneaded body (third step). When the third process is completed, a part of the excavated soil 12 that was discharged to the ground in the first process, the solidifying material 13 and the water 14 are removed.
was dropped onto the already prepared kneaded body 15 in the excavated hole 11. The excavation auger 3 is rotated forward and backward and moved up and down to stir and mix and then compact the mixture to form a cylindrical kneaded body 15.
Stack them up. Such operations are repeated one after another, and all the excavated soil 12 is made into a kneaded body 15 and formed into one homogeneous kneaded body 15 in the excavated hole II (fourth step). Note that this kneaded body 15 becomes a hardened body over time and strengthens the ground. By the way, if the work of dropping the excavated soil 12 in the fourth step is performed by the dozer 9 installed in the earth-moving machine 5, it can be done by a small number of people (1 to 2 people) and the work can be done in a short time.
第4図は掘削オーガ3に撹拌爪10を装着する場合を示
す一部断面図であるが,螺旋鍔部2の部分に取付孔16
を形威しておき,この取付孔16に撹拌爪10のネジ部
10b部分を挿通してナント17で締結するものが考え
られる。なお,この撹拌爪10は同一個所に3個程度取
り付けるのが望ましい。さらに.螺旋鍔部2は傾斜して
いるから,撹拌爪10の主体10aの後端をこの傾斜に
沿う傾斜形状にしたり.ナント17部分には同しく傾斜
形状のワンシャ18を用いたりすることもある。第5図
はこの取付孔16の配置を示すものであるが,予め複数
個を設けておき,その位置を選択することで,複数の撹
拌爪を直線状,傾斜状,千鳥状等に取付けることができ
る。この他,この撹拌爪10を螺旋鍔部2に直接溶接付
け等で取り付けても機能的には変わらない。FIG. 4 is a partial cross-sectional view showing the case where the stirring claw 10 is attached to the excavation auger 3.
It is conceivable that the threaded part 10b of the stirring claw 10 is inserted into this mounting hole 16 and fastened with a nant 17. Note that it is desirable to attach about three stirring claws 10 at the same location. moreover. Since the spiral flange 2 is inclined, the rear end of the main body 10a of the stirring claw 10 is formed into an inclined shape along this inclination. A similarly inclined one-shaft 18 may be used for the nant 17 portion. Figure 5 shows the arrangement of the mounting holes 16, but by providing a plurality of holes in advance and selecting their positions, it is possible to mount a plurality of stirring claws in a straight line, an inclined shape, a staggered shape, etc. Can be done. In addition, even if the stirring claw 10 is attached directly to the spiral flange 2 by welding or the like, there is no functional difference.
以上,この発明は,前記したものであるから,次のよう
な効果が期待できる。Since the present invention has been described above, the following effects can be expected.
i)掘削穴ll中の下半分の掘削土12は地上に排土さ
れることなく,この掘削穴11の中で固化材13等と攪
拌混合されるものであるから,作業時間が短く,省力的
である。そして,このときの上半分の掘削土12は地上
に除かれているのであるから,掘削オーガ3の上下動ス
トロークを大きくして掘削土I2を上下に大きく揺さぶ
ることができ,攪拌混合を完璧に行うことができるとと
もに,このとき発生する空気を逃がし,混練体15中に
気泡として残さない。i) Since the excavated soil 12 in the lower half of the excavated hole 11 is stirred and mixed with the solidification material 13 etc. in this excavated hole 11 without being discharged to the ground, the working time is shortened and labor is saved. It is true. At this time, since the upper half of the excavated soil 12 has been removed to the ground, the vertical stroke of the excavating auger 3 can be increased to shake the excavated soil I2 up and down, thereby achieving perfect stirring and mixing. In addition to allowing air generated at this time to escape, it does not remain in the kneaded body 15 as air bubbles.
ii )掘削穴11の上半分の掘削土12と固化材13
等の攪拌混合は掘削穴11中で少量ずつ数同に分けて行
うものであるから,攪拌混合作業および投下作業が省力
的であるとともに.攪拌混合も十分に行うことができる
。ii) Excavated soil 12 and solidified material 13 in the upper half of the excavated hole 11
Since the stirring and mixing of the materials is carried out in small portions at the same time in the excavated hole 11, the stirring and mixing work and the dropping work are labor-saving. Stirring and mixing can also be performed sufficiently.
iii )掘削土12と固化材13との攪拌混合時には
少量の水14を添加するものであるから,この水14が
空気を取り出し.気泡として混練体15の中に残さない
.
iv)掘削オーガ3の撹拌爪10は着脱自在であるから
.必要に応じて取付け,取外しができる.さらに,撹拌
爪10の配置も任意に選択できるから,硬軟の地盤に量
適に対処できる。iii) Since a small amount of water 14 is added when stirring and mixing the excavated soil 12 and the solidification material 13, this water 14 extracts air. No air bubbles remain in the kneaded body 15. iv) The stirring claw 10 of the excavation auger 3 is removable. It can be installed and removed as necessary. Furthermore, since the arrangement of the stirring claws 10 can be selected arbitrarily, it is possible to deal with hard and soft ground in an appropriate amount.
第1図はこの発明に係る地盤改良工法の工程図第2図は
この工法に用いる掘削オーガを装備した土工機械の側面
図,第3図は掘削オーガの側面図,第4図は掘削オーガ
に撹拌爪を装着した場合の一部断面側面図,第5図は取
付孔の配置を示す断面平面図である.
(符号〉
2・・螺旋鍔部
3・・掘削オーガ
10・・撹拌爪
1l・・掘削穴
12・・掘削土
13・・地盤改良固化材
14・・水
15・・混練体Fig. 1 is a process diagram of the ground improvement method according to the present invention. Fig. 2 is a side view of an earth-moving machine equipped with an excavating auger used in this method. Fig. 3 is a side view of the excavating auger. Fig. 4 is a diagram of the excavating auger. Figure 5 is a partial cross-sectional side view when the stirring claw is attached, and Figure 5 is a cross-sectional plan view showing the arrangement of the mounting holes. (Symbols> 2... Spiral flange 3... Excavation auger 10... Stirring claw 1l... Excavation hole 12... Excavation soil 13... Ground improvement solidification material 14... Water 15... Kneaded body
Claims (1)
。 掘削オーガ(3)を作動させて設定掘削深さ(H)の略
半分を掘削し、掘削土(12)を地上に排土する第一工
程 第一工程で掘削した掘削穴(11)に地盤改良固化材(
13)および必要に応じて少量の水(14)を投下し、
掘削オーガ(3)を作動させて設定掘削深さ(H)の残
り半分を掘削するとともに、掘削土(12)と地盤改良
固化材(13)および水(14)を撹拌混合する第二工
程 第二工程において掘削土(12)、地盤改良固化材(1
3)および水(14)を攪拌混合したものを掘削オーガ
(3)を作動させて締固め、円柱状の混練体(15)に
造成する第三工程 第三工程で造成した混練体(13)の上に第一工程で排
土した掘削土(12)の一部、地盤改良固化材(13)
および水(14)を投下し、これらを掘削オーガ(3)
を作動させて攪拌混合した後に締固めて円柱状の混練体
(15)として積重する操作を数回に分けて行う第四工
程 [2]、掘削オーガ(3)の先端近くの螺旋鍔部(2)
に撹拌爪(10)を取付けてなる請求項[1]記載の地
盤改良工法に用いる掘削オーガ。[Claims] [1] A ground improvement method comprising the following first to fourth steps. Activate the excavation auger (3) to excavate approximately half of the set excavation depth (H), and discharge the excavated soil (12) to the ground in the first step. Improved solidification material (
13) and a small amount of water (14) if necessary,
The second step involves operating the excavation auger (3) to excavate the remaining half of the set excavation depth (H), and stirring and mixing the excavated soil (12), soil improvement solidification material (13), and water (14). In the second process, excavated soil (12), ground improvement solidification material (1
3) and water (14) are stirred and mixed by operating an excavation auger (3) and compacted to form a cylindrical kneaded body (15).The kneaded body (13) created in the third step Part of the excavated soil (12) excavated in the first process, and soil improvement solidification material (13)
and water (14), and the excavating auger (3)
The fourth step [2] is to carry out the operation of stirring and mixing, compacting and stacking into a cylindrical kneaded body (15) in several steps [2], the spiral flange near the tip of the excavation auger (3). (2)
The excavation auger used in the ground improvement method according to claim [1], further comprising a stirring claw (10) attached to the excavation auger.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30505489A JPH03166417A (en) | 1989-11-25 | 1989-11-25 | Ground improving method and drilling auger to be used |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30505489A JPH03166417A (en) | 1989-11-25 | 1989-11-25 | Ground improving method and drilling auger to be used |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH03166417A true JPH03166417A (en) | 1991-07-18 |
Family
ID=17940563
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP30505489A Pending JPH03166417A (en) | 1989-11-25 | 1989-11-25 | Ground improving method and drilling auger to be used |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH03166417A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005282186A (en) * | 2004-03-30 | 2005-10-13 | Daiwa House Ind Co Ltd | Yield strength increasing method of pile driven in ground surface and pile surrounding earth compacting tool |
-
1989
- 1989-11-25 JP JP30505489A patent/JPH03166417A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005282186A (en) * | 2004-03-30 | 2005-10-13 | Daiwa House Ind Co Ltd | Yield strength increasing method of pile driven in ground surface and pile surrounding earth compacting tool |
JP4490149B2 (en) * | 2004-03-30 | 2010-06-23 | 大和ハウス工業株式会社 | Strengthening method of pile driven into the ground |
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