JPS6353330B2 - - Google Patents
Info
- Publication number
- JPS6353330B2 JPS6353330B2 JP14709583A JP14709583A JPS6353330B2 JP S6353330 B2 JPS6353330 B2 JP S6353330B2 JP 14709583 A JP14709583 A JP 14709583A JP 14709583 A JP14709583 A JP 14709583A JP S6353330 B2 JPS6353330 B2 JP S6353330B2
- Authority
- JP
- Japan
- Prior art keywords
- pilot
- stirring head
- tip
- stirring
- reinforcing material
- 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.)
- Expired
Links
- 238000003756 stirring Methods 0.000 claims description 42
- 238000009412 basement excavation Methods 0.000 claims description 18
- 230000002265 prevention Effects 0.000 claims description 18
- 239000012779 reinforcing material Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 16
- 239000002689 soil Substances 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004568 cement Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2/00—General structure of permanent way
- E01B2/006—Deep foundation of tracks
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Agronomy & Crop Science (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Description
【発明の詳細な説明】
本発明は土木工事における水平地盤改良を行う
方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for horizontal ground improvement in civil engineering work.
なお、本発明における「水平」とは、施工上差
支えない程度の傾斜を含むものとする。 Note that "horizontal" in the present invention includes an inclination that does not cause any problem during construction.
土木工事においてトンネル又は地下構造物等を
作る場合、掘削による地山のゆるみや地表面の変
形を抑止するとともに安全にトンネル等を掘削す
る必要があり、第1図に示す如く鉄道線路2下で
地表近くにトンネル1を掘削する場合はトンネル
1掘削に先立つてその上部及び両側の地盤がゆる
まない様な施工を行うことが必要である。 When building tunnels or underground structures during civil engineering work, it is necessary to prevent the loosening of the ground and deformation of the ground surface due to excavation, and to excavate the tunnels safely. When tunnel 1 is excavated near the ground surface, it is necessary to carry out construction work to prevent the ground above and on both sides from loosening prior to excavating tunnel 1.
従来、上記要件を満たすためにはパイプルーフ
工法が用いられた。この工法は第2図aに示す如
く、オーガー掘進機3にて水平に掘進しつつ鋼管
4を圧入する工法で、第2図bの連結方式と第2
図cの独立方式がある。第2図bは特殊な継手5
aを使用した鋼管矢板5を用いると周辺地山から
の漏水や崩壊がない。第2図cは鋼管4の周囲に
セメントミルク6を注入してルーフを形成したも
のである。 Conventionally, pipe roof construction methods have been used to meet the above requirements. As shown in Figure 2a, this construction method involves press-fitting the steel pipe 4 while horizontally digging with an auger excavator 3.
There is an independent method shown in Figure c. Figure 2b shows special joint 5
If the steel pipe sheet pile 5 using a is used, there will be no water leakage or collapse from the surrounding ground. In FIG. 2c, cement milk 6 is poured around the steel pipe 4 to form a roof.
以上の如き従来のパイプルーフ工法は鋼管矢板
や鋼管を使用するので材料費が高く、鋼管等の重
量物運搬と取り扱いに手間がかかる欠点があつ
た。 The conventional pipe roof construction method described above uses steel pipe sheet piles and steel pipes, so the material cost is high, and the drawbacks are that it takes time and effort to transport and handle heavy objects such as steel pipes.
本発明は上述した事情に鑑みてなされたもので
あり、先ずパイロツトロツドによるパイロツト掘
削を行い、次にパイロツトロツドを先端に共まわ
り防止装置を有する撹拌ヘツドと交換した後、上
記先端の共まわり防止装置に鉄筋等の補強材の一
端を取付け、パイロツト掘削孔にそつて撹拌ヘツ
ド基部の噴出口より地盤固化材を噴出せしめなが
ら上記撹拌ヘツドの撹拌翼を回転して上記撹拌ヘ
ツドを引抜くことにより改良柱を形成することを
特徴とする水平地盤改良の方法及び上記工程によ
り改良柱をトンネル掘削に先立ち該トンネル上部
及び両側に所定本数施工して柱列壁を設置するこ
とを特徴とする水平地盤改良の方法を提供せんと
するものである。 The present invention has been made in view of the above-mentioned circumstances. First, pilot excavation is carried out using a pilot rod, and then the pilot rod is replaced with a stirring head having a co-rotation prevention device at the tip. After that, the pilot rod is replaced with a stirring head having a co-rotation prevention device at the tip. Attach one end of reinforcing material such as reinforcing steel, and rotate the stirring blades of the stirring head while spouting the soil solidification material from the spout at the base of the stirring head along the pilot excavation hole, and pull out the stirring head to improve the column. A method of horizontal ground improvement characterized by forming a horizontal ground improvement method, and a method of horizontal ground improvement characterized by constructing a predetermined number of improvement columns at the top and both sides of the tunnel prior to tunnel excavation by the above process, and installing column row walls. The purpose is to provide a method.
以下第3図ないし第6図に基づいて詳細に説明
する。第3図aは本発明の一実施例を示すパイロ
ツト掘削の説明図、第3図bは同、共まわり防止
装置付撹拌ヘツドによる撹拌・引抜きの説明図、
第4図aはパイロツトロツドの斜視図、第4図b
は共まわり防止装置に補強材を取付けた撹拌ヘツ
ドの側面図、第4図cは同、正面図、第4図dは
掘削軸先端のスイベルに補強材を取付けた撹拌ヘ
ツドの側面図、第5図は本発明の施工順序の説明
図、第6図は本発明の柱列壁の配置説明図であ
る。 A detailed explanation will be given below based on FIGS. 3 to 6. FIG. 3a is an explanatory diagram of pilot excavation showing one embodiment of the present invention, and FIG. 3b is an explanatory diagram of stirring and pulling out using a stirring head equipped with a rotation prevention device.
Figure 4a is a perspective view of the pilot rod, Figure 4b
Figure 4c is a side view of the stirring head with a reinforcing material attached to the anti-rotation device, Figure 4c is a front view of the stirring head, and Figure 4d is a side view of the stirring head with a reinforcing material attached to the swivel at the tip of the excavation shaft. FIG. 5 is an explanatory diagram of the construction order of the present invention, and FIG. 6 is an explanatory diagram of the arrangement of column walls of the present invention.
第3図aにおいて7はボーリング機で発進立坑
8に据付けられ掘削ロツド9の先端には第4図a
に示す如き先端にビツト9aを有するパイロツト
ロツド10がねじ等で取着されている。11は到
達立坑である。本発明を実施するには第5図a〜
第5図gに示す如き順序で行う。 In Fig. 3a, 7 is a boring machine installed in the starting shaft 8, and the tip of the drilling rod 9 is shown in Fig. 4a.
A pilot rod 10 having a bit 9a at its tip as shown in FIG. 1 is attached with a screw or the like. 11 is a reaching shaft. To carry out the present invention, FIG.
The procedure is as shown in FIG. 5g.
第5図a,b 発進立坑側からボーリング機によ
り、パイロツトロツド10を取着
した掘削ロツド9を回転・給進せ
しめ、無水あるいは有水(極少
量)掘削を行う。Figures 5a and b: Drilling rod 9 to which pilot rod 10 is attached is rotated and fed by a boring machine from the starting shaft side, and waterless or waterless (extremely small amount) drilling is performed.
第5図c,d 第3図aにも示す如く、パイロツ
トロツド10が到達立坑11に貫
通してパイロツト掘削が完了する
とパイロツトロツド10を取外
す。FIGS. 5c and d As also shown in FIG. 3a, the pilot rod 10 penetrates the reaching shaft 11 and when the pilot excavation is completed, the pilot rod 10 is removed.
第5図e 先端に共まわり防止装置12dを
有する撹拌ヘツド12を取着し、
該撹拌ヘツド12の共まわり防止
翼に鉄筋16の一端を取付け、同
時に第3図bにも示す如く地盤固
化材の注入ホース13aを有する
スイベル13を掘削ロツド9のボ
ーリング機側端に取着する。Fig. 5e Attaching the stirring head 12 having a co-rotation prevention device 12d at the tip,
One end of the reinforcing bar 16 is attached to the anti-rotation blade of the stirring head 12, and at the same time, a swivel 13 having a soil solidification material injection hose 13a is attached to the end of the drilling rod 9 on the side of the boring machine, as shown in FIG. 3b. .
第5図f,g 撹拌ヘツド12基部の噴出口12
b(第4図b)より地盤固化材を
噴出せしめつつ、先に貫通したパ
イロツト掘削孔にそつて、てん
充・掘削・撹拌・引抜きを行う。
この際撹拌ヘツド先端の共まわり
防止翼12dは回転せず、撹拌翼
12aが回転して地盤固化材と土
壌を撹拌した跡に鉄筋16を埋設
する。Figure 5 f, g Spout 12 at the base of the stirring head 12
While ejecting the ground solidifying material from b (Fig. 4b), filling, excavation, stirring, and extraction are carried out along the pilot drilling hole that was penetrated earlier.
At this time, the co-rotation prevention blade 12d at the tip of the stirring head does not rotate, and the reinforcing bars 16 are buried in the area where the stirring blade 12a rotates and stirs the ground solidification material and soil.
上記作業を発進立坑まで行つて、撹拌翼を発進
立坑側に引抜くと一本の改良柱14が形成され
る。引続き第6図に示す如く、施工すべきトンネ
ル1の上部及び両側に前以つて所要本数の改良柱
14を施工することにより柱列壁15を設置す
る。 When the above operation is performed up to the starting shaft and the stirring blade is pulled out toward the starting shaft, one improved column 14 is formed. Subsequently, as shown in FIG. 6, column walls 15 are installed by previously constructing the required number of improved columns 14 on the top and both sides of the tunnel 1 to be constructed.
上記共まわり防止装置を有する撹拌ヘツドは本
発明の出願人が先に特願昭55−056970号(特開昭
56−153013号)として出願済みのもので、第4図
b,cに示す如く共まわり防止翼12dは撹拌翼
12aより大径で、掘削軸12eに対しボス12
fを介して回転自在に挿着されている。そのた
め、撹拌翼12aにより撹拌しつつある土壌(土
塊)共まわり防止翼12dにより回転が一旦停止
されるので上記共まわり防止翼12dと撹拌翼1
2aとで土壌の混合撹拌が効率良く行われるもの
であるが、本発明に上記撹拌ヘツドを使用する場
合は共まわり防止翼が施工中に回転しないことを
利用し、該共まわり防止翼を撹拌ヘツドの先端に
設け、上記共まわり防止翼に改良柱に埋設する鉄
筋等の補強材を取付けるようにしたものである。 The above-mentioned stirring head having the co-rotation prevention device was first developed by the applicant of the present invention in Japanese Patent Application No. 55-056970.
56-153013), and as shown in FIG.
It is rotatably inserted via f. Therefore, the rotation of the soil (soil clod) that is being stirred by the stirring blade 12a is temporarily stopped by the rotation prevention blade 12d, so that the rotation of the soil (soil clod) that is being stirred by the stirring blade 12a is temporarily stopped.
2a, the soil can be mixed and stirred efficiently, but when using the above-mentioned stirring head in the present invention, the fact that the co-rotation prevention blades do not rotate during construction is used to stir the co-rotation prevention blades. This is provided at the tip of the head, and a reinforcing material such as a reinforcing bar buried in the improved column is attached to the above-mentioned anti-rotation wing.
しかして、上記の如く撹拌ヘツド先端に設けた
共まわり防止翼に鉄筋等の補強材を取付けて施工
する代りに、第4図dに示す如く掘削軸12e先
端にスイベル18を設け、これに鉄筋等の補強材
16を取付け、補強材16の周面摩擦により補強
材16は回転せず、掘削軸12eと撹拌翼12a
のみ回転させて引抜く方法をとることもできる。
この場合、中心に鉄筋等の補強材を埋設した改良
柱が得られる。 Therefore, instead of attaching reinforcing materials such as reinforcing bars to the co-rotation prevention blades provided at the tip of the stirring head as described above, a swivel 18 is provided at the tip of the excavation shaft 12e as shown in FIG. etc., the reinforcing material 16 is attached, and the reinforcing material 16 does not rotate due to the friction on the circumferential surface of the reinforcing material 16, and the reinforcing material 16 does not rotate between the excavation shaft 12e and the stirring blade 12a.
You can also use a method of rotating and pulling out.
In this case, an improved column with a reinforcing material such as a reinforcing bar buried in the center can be obtained.
柱列壁15は第6図bに示す如く、改良柱14
間が隙間を有する如く施工するか、又は第6図a
に示す如く改良柱14が互にラツプするよう、改
良柱の軸心間のピツチpを改良柱外径D以下とす
ることができる。 The column wall 15 is connected to the improved column 14 as shown in FIG. 6b.
Construction should be done so that there is a gap between them, or
The pitch p between the axes of the improved columns can be made equal to or less than the improved column outer diameter D so that the improved columns 14 overlap each other as shown in FIG.
第6図aの如き互にラツプした柱列壁を施工す
るには、先ず1本置きに改良柱を施工し、次に該
改良柱間にさらに改良柱を施工すると、パイロツ
ト掘削孔の曲りが少なく、改良柱相互のラツプ状
態も完全に仕上るものである。上記改良柱は互に
ラツプしているので周辺地山からの漏水を防止す
ることができる。 To construct a row of pillars that wrap around each other as shown in Figure 6a, first construct an improved pillar at every other pillar, and then construct further improved pillars between the improved pillars to prevent the curvature of the pilot excavation hole. The overlap between the improved pillars is completely completed. Since the improved pillars overlap each other, water leakage from the surrounding ground can be prevented.
以上詳細に説明した如く、本発明の方法によれ
ばパイロツト掘削により施工精度が保て、なおか
つ安価で能率良く水平地盤改良を行うことができ
ると共に、鉄筋等の補強材を埋設した改良柱によ
る曲げに強い柱列壁で強固な改良地盤を形成する
ことができる。従つてトンネル又は地下構造物等
を作るに先立つて、本発明による水平地盤改良を
実施すると、掘削による地山のゆるみや地表面の
変形を抑止することができる。 As explained in detail above, according to the method of the present invention, construction accuracy can be maintained through pilot excavation, and horizontal ground improvement can be carried out inexpensively and efficiently. It is possible to form a strong improved ground with column walls that are strong against the ground. Therefore, by implementing the horizontal ground improvement according to the present invention before constructing a tunnel or underground structure, it is possible to prevent loosening of the ground and deformation of the ground surface due to excavation.
第1図は鉄道線路下で地表近くにトンネルを施
工する場合の水平地盤改良の説明図、第2図は水
平地盤改良のパイプルーフ工法の説明図、第3図
aは本発明の一実施例を示すパイロツト掘削の説
明図、第3図bは同、共まわり防止装置を有する
撹拌ヘツドによる撹拌・引抜きの説明図、第4図
aはパイロツトロツドの斜視図、第4図bは先端
の共まわり防止装置に補強材を取付けた撹拌ヘツ
ドの側面図、第4図cは同、正面図、第4図dは
掘削軸先端のスイベルに補強材を取付けた撹拌ヘ
ツドの側面図、第5図は本発明の施工順序の説明
図、第6図は補強材を埋設した柱列壁の配置説明
図である。
1……トンネル、7……ボーリング機、8……
発進立坑、9……掘進ロツド、10……パイロツ
トロツド、10a……ビツト、11……到達立
坑、12……撹拌ヘツド、12a……撹拌翼、1
2b……噴出口、12c……共まわり防止装置、
12d……共まわり防止翼、14……改良柱、1
5……柱列壁、16……鉄筋、p……ピツチ、D
……改良柱外径、18……スイベル。
Figure 1 is an explanatory diagram of horizontal ground improvement when constructing a tunnel near the ground surface under railway tracks, Figure 2 is an explanatory diagram of the pipe roof construction method for horizontal ground improvement, and Figure 3a is an example of the present invention. Fig. 3b is an explanatory diagram of stirring and extraction by a stirring head with a co-rotation prevention device, Fig. 4a is a perspective view of the pilot rod, and Fig. 4b is a co-rotation of the tip. Fig. 4c is a side view of the stirring head with a reinforcing material attached to the prevention device, Fig. 4d is a side view of the stirring head with a reinforcing material attached to the swivel at the tip of the excavation shaft, and Fig. 5 is a front view. FIG. 6 is an explanatory diagram of the construction order of the present invention, and is an explanatory diagram of the arrangement of column walls in which reinforcing materials are embedded. 1...tunnel, 7...boring machine, 8...
Starting shaft, 9... Excavation rod, 10... Pilot rod, 10a... Bit, 11... Arrival shaft, 12... Stirring head, 12a... Stirring blade, 1
2b... spout, 12c... co-rotation prevention device,
12d...Co-rotation prevention wing, 14...Improved column, 1
5... Column row wall, 16... Rebar, p... Pitch, D
...Improved column outer diameter, 18...Swivel.
Claims (1)
置したボーリング機を用いて、先端にビツトを有
するパイロツトロツドを取付けた掘削ロツドを回
転・給進せしめることにより、水平にパイロツト
掘削を行い、上記パイロツトロツドが到達坑に貫
通後、該パイロツトロツドを先端に共まわり防止
装置を有する撹拌ヘツドと交換し、次に上記先端
の共まわり防止装置に鉄筋等の補強材の一端を取
付け、パイロツト掘削孔にそつて撹拌ヘツド基部
の噴出口より地盤固化材を噴出せしめながら上記
撹拌ヘツドの撹拌翼を回転して上記補強材と共に
撹拌ヘツドを発進立坑まで引抜くことにより、軸
方向に補強材を埋設した改良柱を形成することを
特徴とする水平地盤改良の方法。 2 発進立坑と到達立坑との間を、発進立坑に設
置したボーリング機を用いて、先端にビツトを有
するパイロツトロツドを取着した掘削ロツドを回
転・給進せしめることにより、水平にパイロツト
掘削を行い、上記パイロツトロツドが到達坑に貫
通後、該パイロツトロツドを先端に共まわり防止
装置を有する撹拌ヘツドと交換し、次に上記先端
の共まわり防止装置に鉄筋等の補強材の一端を取
付け、パイロツト掘削孔にそつて撹拌ヘツド基部
の噴出口より地盤固化材を噴出せしめながら上記
撹拌ヘツドの撹拌翼を回転して上記補強材と共に
撹拌ヘツドを発進立坑まで引抜くことにより、軸
方向に補強材を埋設した改良柱を形成し、引続き
上記工程で、掘削すべきトンネル、地下埋設物等
の上部及び両側に前以つて所定本数の改良柱を形
成することにより、柱列壁を設置することを特徴
とする水平地盤改良の方法。 3 柱列壁を形成する改良柱間に隙間を有するこ
とを特徴とする特許請求の範囲第2項記載の水平
地盤改良の方法。 4 柱列壁を形成する改良柱の軸心間のピツチを
改良柱外径以下としたことを特徴とする特許請求
の範囲第2項記載の水平地盤改良の方法。[Scope of Claims] 1. A drilling machine installed in the starting shaft is used to rotate and feed a drilling rod equipped with a pilot rod having a bit at the tip, so that the distance between the starting shaft and the destination shaft is horizontal. Perform pilot excavation, and after the pilot rod has penetrated the reaching hole, replace the pilot rod with a stirring head that has a co-rotation prevention device at the tip, and then attach one end of reinforcing material such as reinforcing steel to the co-rotation prevention device at the tip. Reinforcement is carried out in the axial direction by rotating the stirring blades of the stirring head and pulling out the stirring head together with the reinforcing material to the starting shaft while spouting the soil solidifying material from the spout at the base of the stirring head along the pilot excavation hole. A horizontal ground improvement method characterized by forming improved pillars with buried timber. 2 Pilot excavation is performed horizontally between the starting shaft and the destination shaft by rotating and feeding a drilling rod equipped with a pilot rod with a bit at the tip using a boring machine installed in the starting shaft. After the pilot rod penetrates the reaching hole, replace the pilot rod with a stirring head that has a co-rotation prevention device at the tip, then attach one end of reinforcing material such as a reinforcing bar to the co-rotation prevention device at the tip, and insert it into the pilot drilling hole. An improvement in which reinforcing material is buried in the axial direction by rotating the stirring blade of the stirring head and pulling out the stirring head together with the reinforcing material to the starting shaft while jetting out the soil solidifying material from the spout at the base of the stirring head. A horizontal method characterized in that a column wall is installed by forming columns and subsequently forming a predetermined number of improved columns on the top and both sides of the tunnel, underground structure, etc. to be excavated in the above process. Method of ground improvement. 3. The method for horizontal ground improvement according to claim 2, characterized in that there is a gap between the improved pillars forming the pillar row walls. 4. The method for horizontal ground improvement according to claim 2, characterized in that the pitch between the axes of the improved columns forming the column walls is set to be equal to or less than the outer diameter of the improved columns.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14709583A JPS6040414A (en) | 1983-08-11 | 1983-08-11 | Improvement of horizontal ground |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14709583A JPS6040414A (en) | 1983-08-11 | 1983-08-11 | Improvement of horizontal ground |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6040414A JPS6040414A (en) | 1985-03-02 |
JPS6353330B2 true JPS6353330B2 (en) | 1988-10-24 |
Family
ID=15422364
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14709583A Granted JPS6040414A (en) | 1983-08-11 | 1983-08-11 | Improvement of horizontal ground |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6040414A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL9302262A (en) * | 1993-12-24 | 1995-07-17 | Nacap Nederland Bv | Method and installation for stabilizing a soil by means of injection. |
JP5542531B2 (en) * | 2010-06-09 | 2014-07-09 | 東海旅客鉄道株式会社 | Ground improvement method and underpass method |
-
1983
- 1983-08-11 JP JP14709583A patent/JPS6040414A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6040414A (en) | 1985-03-02 |
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