JPS63300110A - Method and apparatus for ground improving work - Google Patents
Method and apparatus for ground improving workInfo
- Publication number
- JPS63300110A JPS63300110A JP13600187A JP13600187A JPS63300110A JP S63300110 A JPS63300110 A JP S63300110A JP 13600187 A JP13600187 A JP 13600187A JP 13600187 A JP13600187 A JP 13600187A JP S63300110 A JPS63300110 A JP S63300110A
- Authority
- JP
- Japan
- Prior art keywords
- stirring
- blade
- screw
- outer diameter
- ground
- 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 20
- 238000003756 stirring Methods 0.000 claims abstract description 55
- 239000002689 soil Substances 0.000 claims abstract description 11
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 28
- 239000003795 chemical substances by application Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000009412 basement excavation Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 11
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 238000007711 solidification Methods 0.000 description 8
- 230000008023 solidification Effects 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000002747 voluntary effect Effects 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分舒〕
本発明は、施工に際し周辺地盤への影響を防止した地盤
改良工法及びその装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to a ground improvement method and an apparatus therefor that prevent the influence on the surrounding ground during construction.
軟弱地盤等の地盤改良工法及びその装置として、例えば
第４図に示すようないわゆる深層混合処理工法及びその
装置が知られている。この工法及び装置は、ヘッド部に
複数段の撹拌羽根２，３，４が取り付けられた撹拌ロッ
ド１を回転（正転）させながら第４図（イ）の如く改良
不要区間Ａを掘削した後、撹拌ロッド１先端の吐出口か
ら固化材Ｓを吐出させながら撹拌ロッド１を回転（正転
）させて給進し、改良区間Ｂの開削撹拌を行う（第４図
（ロ）、（ハ））。次いで、第４図（ニ）。As a ground improvement method and equipment for soft ground, for example, a so-called deep mixing method and equipment as shown in FIG. 4 are known. This construction method and device are used to excavate an area A that does not require improvement as shown in Figure 4 (a) while rotating (normally rotating) a stirring rod 1 with multiple stages of stirring blades 2, 3, and 4 attached to the head. , The stirring rod 1 is rotated (normally rotated) and fed while discharging the solidified material S from the discharge port at the tip of the stirring rod 1, and cut-and-cover stirring is performed in the improved section B (Fig. 4 (B) and (C)). ). Next, Figure 4 (d).
（ホ）の如く撹拌ロッド１を逆転させながら撹拌引揚げ
を行うものである。As shown in (e), the stirring rod 1 is reversed while stirring and lifting is performed.
しかしながら、上記工法においては飽和状態に近い地盤
中に固化材を注入するため、その分電盤内に体積膨張を
生じて水平方向への地盤変状を発生し、場合によっては
周辺の地下構造物に影響を与えることがあった。However, in the above method, the solidification material is injected into the ground which is close to saturated, which causes volumetric expansion within the distribution panel, causing horizontal ground deformation and, in some cases, causing damage to surrounding underground structures. could have an impact on.
本発明は上記のような実情に鑑みてなされたもので、固
化材を注入するにも拘らず、地盤変状を確実に防止する
ことができる地盤改良工法及びその装置を提供すること
を目的とする。The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to provide a ground improvement method and device that can reliably prevent ground deformation even though solidification material is injected. do.
上記目的を達成するため第１の発明に係る地盤改良工法
は、撹拌羽根先端外径よ抄小さく、所定の外径を有する
スクリューロッド下端に、少なくとも１段の撹拌羽根を
有する撹拌ヘッドを連結したロッド体を正転・給進し、
改良区間下端まで掘削した後、前記撹拌ヘッド下部に設
けた吐出口から固化材を高圧で吐出しながら正転・引揚
げして撹拌羽根で撹拌すると共に、前記スクリューロッ
ドによる排土を行い、次に改良不要区間を前記ロッド体
を正転又は逆転して引揚げることを特徴とし、
第２の発明に係る地盤改良装置は、管の外周にスクリュ
ー羽根を形成し、該スクリュー羽根外径が撹拌羽根先端
外径より小さく、所定の外径を有するスクリューロッド
下端に、撹拌ヘッドを連結して成り、該撹拌ヘッドには
少なくとも１段の撹拌羽根を配設すると共に、下部に固
化材の吐出口を設けたことを特徴とする。In order to achieve the above object, the ground improvement method according to the first invention is such that a stirring head having at least one stage of stirring blades is connected to the lower end of a screw rod having a predetermined outer diameter smaller than the outer diameter of the tip of the stirring blade. Rotate and feed the rod body forward,
After excavating to the lower end of the improved section, the solidified material is discharged at high pressure from the discharge port provided at the bottom of the stirring head, and the soil is rotated forward and pulled up to be stirred by the stirring blade, and the soil is discharged by the screw rod. The soil improvement device according to the second invention is characterized in that a section requiring no improvement is lifted by rotating the rod body in the normal or reverse direction. A stirring head is connected to the lower end of a screw rod having a predetermined outer diameter smaller than the outer diameter of the tip of the blade, and the stirring head is provided with at least one stage of stirring blades, and has a discharge port for solidifying material at the bottom. It is characterized by having the following.
注入・撹拌・引揚げの際に、スクリューにより固化材量
に相当する土量が排出されるので、固化材注入による改
良区間の体積膨張が回避され周辺地盤の変状が防止され
る。During injection, stirring, and lifting, the screw discharges an amount of soil equivalent to the amount of solidification material, so volumetric expansion of the improved section due to the injection of solidification material is avoided and deformation of the surrounding ground is prevented.
以下、本発明の実施例を図面に基づいて説明する。 Embodiments of the present invention will be described below based on the drawings.
第１図（イ）〜（ホ）は本発明工法の手順を示す説明図
、第２図は本発明装置の撹拌ヘッド１１の拡大図である
。FIGS. 1A to 1E are explanatory diagrams showing the procedure of the method of the present invention, and FIG. 2 is an enlarged view of the stirring head 11 of the apparatus of the present invention.
ロッド体１０は、外周にスクリュー羽根１２が形成され
たスクリューロッド１３の下端部に撹拌ヘッド１１を継
手等で連結してなり、該撹拌ヘッド１１には上下２￥９
の撹拌羽根１４．１５が取や付けられている。また、ス
クリューロッド１３と撹拌ヘッド１１の内部には固化材
の流路が形成されており、該撹拌へラド１１の下部撹拌
羽根１５と同位置に吐出口２０が開口している。上記流
路には例えばセメント系固化材等の固化材が地上の装置
から供給され、上記吐出口２０から固化材が所定の圧力
で吐出されるように構成されている。The rod body 10 is formed by connecting a stirring head 11 to the lower end of a screw rod 13 having screw blades 12 formed on its outer periphery with a joint or the like.
Stirring blades 14 and 15 are installed. Further, a flow path for the solidified material is formed inside the screw rod 13 and the stirring head 11, and a discharge port 20 is opened at the same position as the lower stirring blade 15 of the stirring head 11. A solidifying material, such as a cement-based solidifying material, is supplied to the flow path from a device on the ground, and the solidifying material is discharged from the discharge port 20 at a predetermined pressure.
なお、前記スクリューロッド１３の外径、即ちスクリュ
ー羽根１２の外径は各撹拌羽根１４，１５の外径よ秒も
小径に形成されている。この場合前記スクリュー羽根１
２にて排土する量が注入する固化材の量に相当するよう
スクリューロッド１３外径を設定するのが良い。また、
図面ではスクリューロッド１３及び撹拌ヘッド１１が各
１本のものを示したが、それらが平行に２本ずつ連結さ
れた２軸構造のものを使用してもよい。The outer diameter of the screw rod 13, that is, the outer diameter of the screw blade 12 is smaller than the outer diameter of each stirring blade 14, 15 by a second. In this case, the screw blade 1
It is preferable to set the outer diameter of the screw rod 13 so that the amount of earth discharged in step 2 corresponds to the amount of solidification material to be injected. Also,
Although the drawing shows one screw rod 13 and one stirring head 11, a two-shaft structure in which two screw rods 13 and two stirring heads 11 are connected in parallel may also be used.
そこで、上記装置を使用した地盤改良工法を第１図に従
って説明する。まず、第１図（イ）。Therefore, a ground improvement method using the above device will be explained with reference to FIG. First, Figure 1 (a).
（ロ）の如くロッド体１０を回転（正転）させながら給
進し、改良不要区間Ａ及び改良区間Ｂ下端の深度まで開
削を行う。As shown in (b), the rod body 10 is fed while being rotated (normally rotated), and excavation is performed to the depth of the lower end of the area A that does not require improvement and the area that is improved.
次いで、第１図（ハ）、（ニ）の如く吐出口２０から固
化材Ｓを高圧で吐出させ、かつスクリューロッド１３を
正転させながら撹拌・引揚げを行う。この注入撹拌引揚
げ工程において、前記スクリュー羽根１２の作用により
該スクリュー羽根１２の直径分の土が順次上方へ運搬さ
れて地上に排土され、残余の土と固化材Ｓとが撹拌羽根
１４゜１５により混合撹拌される。従って、固化付注入
による改良区間Ｂの体積膨張を防ぐことができる。Next, as shown in FIGS. 1(c) and 1(d), the solidified material S is discharged from the discharge port 20 at high pressure, and the screw rod 13 is rotated in the normal direction while being stirred and withdrawn. In this injection stirring pulling process, the screw blades 12 act to transport the soil corresponding to the diameter of the screw blades 12 upward one by one and discharge it to the ground, and the remaining soil and solidified material S are disposed of by the stirring blades 14°. 15 for mixing and stirring. Therefore, volumetric expansion of the improved section B due to injection with solidification can be prevented.
なお、スクリュー羽根１２にて排土する量が注入する固
化材量に等しくなるようにするのが良い。Note that it is preferable that the amount of earth discharged by the screw blade 12 be equal to the amount of solidification material injected.
この注入撹拌引揚げ工程における上部吐出口２０からの
固化材Ｓの吐出圧は５０〜２００ｋｇ／ｃＩｌの高圧と
する。このように固化材を高圧吐出することによって固
化材がよく分散し、混合撹拌効果が向上する。従って、
撹拌羽根も少なくてよく（本実施例では２段設けである
が１段でもよい）、また特に改良区間Ｂの先端部処理を
低圧吐出の場合のように別途工程を設けて行う必要もな
いので吐出口は１ケ処でよく、そのためスクリューロッ
ド１３及び撹拌ヘッド１１は単管構造ですみ、注入ポン
プ類も１式でよい等、構成が簡略化される。The discharge pressure of the solidified material S from the upper discharge port 20 in this injection stirring pulling process is set to a high pressure of 50 to 200 kg/cIl. By discharging the solidifying material under high pressure in this manner, the solidifying material is well dispersed, and the mixing and stirring effect is improved. Therefore,
The number of stirring blades may be reduced (in this example, two stages are provided, but one stage may also be used), and there is no need to provide a separate process for the tip treatment in the improved section B, unlike in the case of low-pressure discharge. Only one discharge port is required, so the screw rod 13 and the stirring head 11 only need to be of a single tube structure, and only one set of injection pumps is required, simplifying the configuration.
上記改良区間Ｂの注入撹拌引揚げが終了したならば、第
１図（ホ）の如く吐出口２０からの固化材の吐出を停止
し、スクリューロッド１３を逆転（又は正転でもよい）
させながら引揚げ、施工を終了する。When the injection stirring withdrawal in the improved section B is completed, the discharge of the solidified material from the discharge port 20 is stopped as shown in FIG.
While doing so, the building was salvaged and construction was completed.
第３図は、本発明工法と第４図に示した従来工法とによ
る地中壁の変位実測比較例を表したもので、縦軸は深度
を、横軸は地中壁の水平方向の変位を表している。この
グラフから明らかなように、本発明工法の場合には地中
壁の変位はほとんど見られなかった。Figure 3 shows a comparative example of the measured displacement of an underground wall between the construction method of the present invention and the conventional construction method shown in Figure 4, where the vertical axis represents the depth and the horizontal axis represents the horizontal displacement of the underground wall. represents. As is clear from this graph, almost no displacement of the underground wall was observed in the construction method of the present invention.
なお、本発明装置には撹拌ヘッド１１の例えば撹拌羽根
１４と１５の間に共回り防止翼を取り付けてもよい。該
共回り防止翼は、撹拌ヘッド１１の回転時においても静
止状態にあって、土が粘着力によって撹拌羽根に付着し
て一緒に回ってしまうこと（共回り）を防止するもので
ある。Note that a co-rotation prevention blade may be attached to the apparatus of the present invention, for example, between the stirring blades 14 and 15 of the stirring head 11. The co-rotation prevention blades remain stationary even when the stirring head 11 rotates, and prevent soil from adhering to the stirring blades due to adhesive force and from rotating together (co-rotation).
以上説明したように本発明によれば、注入撹拌引揚げ工
程の際に、固化材の注入量にほぼ見合う量の土がスクリ
ューによって排出されるので、改良地盤の体積膨張が回
避され地盤変状が防止される結果、周辺の地下構造物へ
の影響が防止される。As explained above, according to the present invention, during the injection stirring and lifting process, an amount of soil approximately equal to the amount of solidification material injected is discharged by the screw, so volumetric expansion of the improved ground is avoided and ground deformation is avoided. As a result, the impact on surrounding underground structures is prevented.
また、固化材を高圧で吐出させるので、固化材がよく分
散して混合撹拌効果が向上し、その結果、工程が簡略化
される。また、固化材の吐出に高圧を用いるので、撹拌
ヘッドの撹拌羽根が１段でも良く、装置が簡単なる。Furthermore, since the solidifying material is discharged under high pressure, the solidifying material is well dispersed, improving the mixing and stirring effect, and as a result, the process is simplified. Furthermore, since high pressure is used to discharge the solidified material, the stirring head may have only one stage of stirring blades, which simplifies the apparatus.
第１図（イ）〜（ホ）は本発明工法の手順を示す説明図
、第２図は本発明装置の撹拌ヘッドの拡大正面図、第３
図（ａ）、（ｂ）は本発明工法と従来工法とによる地中
壁の変位実測比較図、第４図（イ）〜（ホ）は従来工法
の手順を示す説明図である。
１０ ・ロッド体、１１・・撹拌ヘッド、１２・・スク
リュー羽根、
１３・・スクリューロッド、
１４．１５・・撹拌羽根、２０ ・吐出口、Ｓ 固化材
、Ｂ・・改良区間、
Ａ 改良不要区間。
特許出願人 株式会社テノックス
代理人 弁理士 佐 藤 英 昭
弄３図
（ｂン
＜ａ＞−Ｊｔ、ｔ （ｍｙｔ）
麦イｉ（ｍｍ）従毫工沫 木必明工
琢
茅４図
手続補正書（旗）
昭和６五 ％１７日
１、事件の表示
昭和６２年特許願第１３６００１号
２、発明の名称
地盤改良工法及びその装置
３、補正をする者
事件との関係 特許出願人
住所東京都港区赤坂２丁目４番１号（白亜ビル）名称
株式会社テノックス
代表者 安１）善次部
４、代理人
住所東京都港区赤坂３丁目８番１４号
６、補正の対象
（１）明細書第８頁第１５行目〜第２０行目に「第１図
（イ）〜（ホ）・・・説明図である。」とある記載を下
記の通り補正する。
ｉｉ：！
示す説明図、第２図は本発明装置の撹拌ヘッドの拡大正
面図、第３図（ａ）及び第３図（ｂ）はそれぞれ本発明
工法と従来工法による地中壁の深度と変位の関係を示す
実測図、第４図（イ）〜第４図（ホ）は従来工法の手順
を示す説明図である。
」
（２）図面の第１図及び第４図を別紙の通り補正する。
１７区
千４図
（イ） （ロ） （）勺 （二”）
（ｊｒＳ）手続補正書輸発）
昭和６２年 ９月１７日
特許庁長官 小 川 邦 夫 殿
−Ｊ［、事件の表示
昭和６２年特許願第１３６００１号
２、発明の名称
地盤改良工法及びその装置
３、補正をする者
事件との関係 特許出願人
住所東京都港区赤坂２丁目４番１号（白亜ビル）名称
株式会社テノックス
代表者 安１）善次部
４、代理人
自発
（１）明細書の第７頁第１行目〜第３行目に「また特に
・・・１ケ処でよく、そのため」とある記載を「固化材
を高圧で吐出するため」と補正する。
以上Figures 1 (a) to (e) are explanatory diagrams showing the steps of the method of the present invention, Figure 2 is an enlarged front view of the stirring head of the device of the present invention, and Figure 3
Figures (a) and (b) are comparative diagrams of measured displacements of underground walls between the construction method of the present invention and the conventional construction method, and Figures 4 (a) to (e) are explanatory diagrams showing the procedure of the conventional construction method. 10 - Rod body, 11... Stirring head, 12... Screw blade, 13... Screw rod, 14.15... Stirring blade, 20 - Discharge port, S Solidifying material, B... Improvement area, A Area not requiring improvement. . Patent applicant Tenox Co., Ltd. Agent Patent attorney Hide Sato
<a>-Jt, t (myt)
Mugii i (mm) 寫寫沫 木 Bi Ming 工琢茅 4 Drawing procedural amendment (flag) 1985 %17th 1, Indication of the incident 1988 Patent Application No. 136001 2, Name of the invention Ground improvement Construction method and its equipment 3, relationship with the case of the person making the amendment Patent applicant address 2-4-1 Akasaka, Minato-ku, Tokyo (Chalk Building) Name
Tenox Co., Ltd. Representative Yasu 1) Zenjibe 4, Agent address 6-3-8-14 Akasaka, Minato-ku, Tokyo, Subject of amendment (1) Page 8, lines 15 to 20 of the specification The statement "Figures 1 (A) to (E)... are explanatory views" has been corrected as follows. ii:! 2 is an enlarged front view of the stirring head of the device of the present invention, and FIGS. 3(a) and 3(b) are the relationship between the depth and displacement of the underground wall by the method of the present invention and the conventional method, respectively. 4(a) to 4(e) are explanatory drawings showing the procedure of the conventional construction method. (2) Figures 1 and 4 of the drawings will be amended as shown in the attached sheet. 17th ward 1,400 zu (a) (b) () 勺 (2”)
(jrS) Procedural amendment export) September 17, 1986 Mr. Kunio Ogawa, Commissioner of the Patent Office
-J No. (Chalk building) name
Representative of Tenox Co., Ltd. Yasushi 1) Yoshitsugube 4, Agent Voluntary Statement (1) On page 7, lines 1 to 3 of the specification, it says, ``Also, in particular... one place is sufficient, for that reason.'' One statement has been corrected to read, "To discharge the solidifying material at high pressure."that's all
Claims (2)
るスクリューロッド下端に、少なくとも１段の撹拌羽根
を有する撹拌ヘッドを連結したロッド体を正転・給進し
、改良区間下端まで掘削した後、前記撹拌ヘッド下部に
設けた吐出口から固化材を高圧で吐出しながら正転・引
揚げして撹拌羽根で撹拌すると共に、前記スクリューロ
ッドによる排土を行い、次に改良不要区間を前記ロッド
体を正転又は逆転して引揚げることを特徴とする地盤改
良工法。(1) A rod body, in which a stirring head with at least one stage of stirring blades is connected to the lower end of a screw rod having a predetermined outer diameter smaller than the outer diameter of the tip of the stirring blade, is rotated and fed in the normal direction to excavate to the lower end of the improved section. After that, while discharging the solidified material under high pressure from the discharge port provided at the bottom of the stirring head, the solidified material is rotated forward and pulled up to be stirred by the stirring blade, and the soil is removed by the screw rod. A ground improvement method characterized by lifting the rod body by rotating it forward or backward.
ー羽根外径が撹拌羽根先端外径より小さく、所定の外径
を有するスクリューロッド下端に、撹拌ヘッドを連結し
て成り、該撹拌ヘッドには少なくとも１段の撹拌羽根を
配設すると共に、下部に固化材の吐出口を設けたことを
特徴とする地盤改良装置。(2) A screw blade is formed on the outer periphery of the pipe, the outer diameter of the screw blade is smaller than the outer diameter of the tip of the stirring blade, and a stirring head is connected to the lower end of the screw rod having a predetermined outer diameter. A ground improvement device characterized by having at least one stage of stirring blades and a discharge port for solidifying material provided at the bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13600187A JPS63300110A (en) | 1987-05-29 | 1987-05-29 | Method and apparatus for ground improving work |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13600187A JPS63300110A (en) | 1987-05-29 | 1987-05-29 | Method and apparatus for ground improving work |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63300110A true JPS63300110A (en) | 1988-12-07 |
Family
ID=15164869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13600187A Pending JPS63300110A (en) | 1987-05-29 | 1987-05-29 | Method and apparatus for ground improving work |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63300110A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0449314A (en) * | 1990-06-15 | 1992-02-18 | Kajima Corp | Execution method of soil cement method |
| JP2006312866A (en) * | 2005-04-06 | 2006-11-16 | Tenox Corp | Method for replacing and constructing column, and replaced column |
| JP2007191857A (en) * | 2006-01-17 | 2007-08-02 | Tenox Corp | Column replacing construction method |
| JP2008025268A (en) * | 2006-07-24 | 2008-02-07 | Tenox Corp | Displacement construction method of column |
| JP2008088746A (en) * | 2006-10-04 | 2008-04-17 | Tenox Corp | Replacing construction method of column |
| JP2008115652A (en) * | 2006-11-07 | 2008-05-22 | Tenox Corp | Replacement and construction method for column |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5147252A (en) * | 1974-10-18 | 1976-04-22 | Matsushita Electric Ind Co Ltd | KOATSUDENGENSOCHI |
| JPS6268917A (en) * | 1985-09-19 | 1987-03-30 | Fudo Constr Co Ltd | Improvement for weak ground |
-
1987
- 1987-05-29 JP JP13600187A patent/JPS63300110A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5147252A (en) * | 1974-10-18 | 1976-04-22 | Matsushita Electric Ind Co Ltd | KOATSUDENGENSOCHI |
| JPS6268917A (en) * | 1985-09-19 | 1987-03-30 | Fudo Constr Co Ltd | Improvement for weak ground |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0449314A (en) * | 1990-06-15 | 1992-02-18 | Kajima Corp | Execution method of soil cement method |
| JP2006312866A (en) * | 2005-04-06 | 2006-11-16 | Tenox Corp | Method for replacing and constructing column, and replaced column |
| JP2007191857A (en) * | 2006-01-17 | 2007-08-02 | Tenox Corp | Column replacing construction method |
| JP2008025268A (en) * | 2006-07-24 | 2008-02-07 | Tenox Corp | Displacement construction method of column |
| JP2008088746A (en) * | 2006-10-04 | 2008-04-17 | Tenox Corp | Replacing construction method of column |
| JP2008115652A (en) * | 2006-11-07 | 2008-05-22 | Tenox Corp | Replacement and construction method for column |
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