JPH0575880B2 - - Google Patents
Info
- Publication number
- JPH0575880B2 JPH0575880B2 JP1273169A JP27316989A JPH0575880B2 JP H0575880 B2 JPH0575880 B2 JP H0575880B2 JP 1273169 A JP1273169 A JP 1273169A JP 27316989 A JP27316989 A JP 27316989A JP H0575880 B2 JPH0575880 B2 JP H0575880B2
- Authority
- JP
- Japan
- Prior art keywords
- shield machine
- side wall
- shaft
- launch shaft
- underground structure
- 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 - Lifetime
Links
- 239000000463 material Substances 0.000 claims description 18
- 238000010276 construction Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 238000009412 basement excavation Methods 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 2
- 238000005192 partition Methods 0.000 description 3
- 210000001015 abdomen Anatomy 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、市街地に上下水道、共同溝、電信、
電話等の布設地下道等の地中構造物を施工するオ
ープンシールド工法に関する。[Detailed Description of the Invention] [Industrial Field of Application] The present invention is applicable to urban areas for water supply and sewage, public drainage, telegraph,
Concerning the open shield construction method for constructing underground structures such as underground passages for laying telephones, etc.
オープンシールド工法は、開削工法（オープン
工法）とシールド工法の長所を生かした合理性に
富む工法である。
The open shield construction method is a highly rational construction method that takes advantage of the advantages of the cut-and-cover construction method (open construction method) and the shield construction method.
第４図〜第６図にその概略を示すと、図中１は
オープンシールド機で、これは左右の側壁板１
ａ，１ｂとその間を連結する底板ｃからなり、前
記端面及び上面を開口したＵ型シールド機であ
る。 The outline is shown in Fig. 4 to Fig. 6. In the figure, 1 is an open shield machine, and this is the left and right side wall plate 1.
It is a U-shaped shield machine consisting of a, lb and a bottom plate c connecting them, with the end faces and top face open.
該オープンシールド機１は推進ジヤツキ２を後
方に向け上下に並べて配設する。図中３は、シー
ルド機１内に設けた隔壁を示す。 The open shield machine 1 has propulsion jacks 2 arranged vertically and facing rearward. 3 in the figure indicates a partition wall provided within the shield machine 1.
発進坑７内にこのシールド機１を配置し、発進
坑７の支保工材８は部分的に除去してから、シー
ルド機１の前面又は上面開口より発進坑７の前方
の土砂を掘削し、かつ排土する。そして、スペー
サー１０を介在させてシールド機１の推進ジヤツ
キ２を伸長して発進坑７内の反力壁９に反力をと
つてシールド機１を前進させ、この前進分にコン
クリート函体等による第１番目の地中構造物４を
上方から吊り降し、シールド機１のテール部１ｄ
内で縮めた推進ジヤツキ２の後方にセツトする。 This shield machine 1 is placed in the launch shaft 7, the supporting material 8 of the launch shaft 7 is partially removed, and the earth and sand in front of the launch shaft 7 is excavated from the front or top opening of the shield machine 1. And remove soil. Then, the propulsion jack 2 of the shield machine 1 is extended with the spacer 10 interposed, and a reaction force is applied to the reaction wall 9 in the launch shaft 7 to move the shield machine 1 forward. The first underground structure 4 is suspended from above, and the tail part 1d of the shield machine 1 is
Set it behind the propulsion jack 2 that has been retracted inside.
次いで、同様にシールド機１の前面又は上面か
らシヤベル、オーガ、バケツト等の掘削手段６で
土砂を掘削しかつ排土してシールド機１を前進さ
せ、前記第１番目の地中構造物４の前に第２番目
の地中構造物４を吊り降す。以下、同様の掘進及
び地中構造物４のセツト工程を繰返して、順次地
中構造物４を縦列に地中に埋設し、後方の地中構
造物４上に埋戻し５を施し、オープンシールド機
１が到達坑まで達したならばこれを撤去して工事
を完了する。 Next, earth and sand are similarly excavated from the front or upper surface of the shielding machine 1 using an excavating means 6 such as a shovel, an auger, or a bucket, and the earth is discharged to move the shielding machine 1 forward. First, the second underground structure 4 is suspended. Thereafter, the same excavation and setting process of the underground structures 4 is repeated to sequentially bury the underground structures 4 in the ground in columns, backfill 5 is applied on the rear underground structures 4, and open shielding is performed. Once Machine 1 reaches the destination shaft, it will be removed and the construction will be completed.
第７図、第８図は前記発進坑７の詳細を示すも
のであるが、いわゆる山止め構造を採用してシー
トパイル等により壁体状とした土留め支保工材８
とＨ型鋼等による腹起し１１や切張１２で補強す
る。
FIGS. 7 and 8 show details of the starting shaft 7, and the earth retaining shoring material 8 adopts a so-called heaping structure and has a wall shape made of sheet piles, etc.
Reinforce it with braces 11 and cut tensions 12 made of H-shaped steel or the like.
ところで、前記のごときオープンシールド機１
は左右側壁体１ａ，１ｂの上部は常に地上に突出
して前進するものであり、このような高さの左右
側壁体１ａ，１ｂを有するオープンシールド機１
を発進坑７内にセツトし、かつ前進させるには上
部の腹起し１１や切張１２はこのオープンシール
ド機１の左右側壁板１ａ，１ｂ上端よりも上方に
位置させなければならず、その分αだけ土留め支
保工材８も上部を地上から突出させている。 By the way, the open shield machine 1 as mentioned above
The upper parts of the left and right side walls 1a, 1b always protrude above the ground and move forward, and the open shield aircraft 1 having the left and right side walls 1a, 1b with such heights
In order to set the machine in the starting shaft 7 and move it forward, the upper riser 11 and shear 12 must be located above the upper ends of the left and right side wall plates 1a and 1b of the open shield machine 1. The upper part of the earth retaining shoring material 8 also protrudes from the ground by the amount α.
オープンシールド機１は部材を発進坑７に吊り
降ろして内部で組み立てるが、土留め支保工材８
の先端が突き出ていると、発進坑７内への人の出
入りもこれを越えなければならず面倒であるし、
発進坑７の開口に蓋をして交通の要に供すること
もできない。 The open shield machine 1 lowers the components into the launch shaft 7 and assembles them internally, but the earth retaining shoring material 8
If the tip of the starting shaft protrudes, people will have to cross over to enter and exit the starting shaft 7, which is troublesome.
It is also not possible to cover the opening of the starting shaft 7 and use it as a transportation hub.
本発明の目的は前記従来例の不都合を解消し、
発進坑を地上から上に突出しないで設けることが
できるオープンシールド工法を提供することにあ
る。 The purpose of the present invention is to eliminate the disadvantages of the conventional example,
To provide an open shield construction method in which a starting shaft can be provided without protruding above the ground.
〔課題を解決するための手段〕
本発明は前記目的を達成するため、いわゆる山
止め構造を採用してシートパイル等により壁体状
として土留め支保工材とＨ型鋼等による腹起しや
切張で補強した発進坑内に、内部に推進ジヤツキ
を設け、前後端及び上面を開口したシールド機を
設置して、シールド機の前面又は上面開口より発
進坑の前方の土砂を掘削排土して、シールド機の
推進ジヤツキを伸長して発進坑内の反力壁に反力
をとつてシールド機を発進坑から前進させ、コン
クリート函体等による第１番目の地中構造物を上
方から吊り降してシールド機のテール部内で縮め
た推進ジヤツキの後方にセツトし、さらにシール
ド機前面又は前部上面から掘削しかつ推進ジヤツ
キを伸長して第１番目の地中構造物及び反力壁に
反力をとつてシールド機を前進させ、この前進分
に新たな地中構造物を吊り降して既設地中構造物
の最前列に位置させ、以下同様な掘削、地中構造
物の設置、前進工程を繰返してシールド機を掘進
させるオープンシールド工法において、シールド
機は左右側壁板を上下の分割体で構成し、発進坑
内に前記上下の分割体で構成した左右側壁板のう
ち、下部側壁板のみで構成した背の低いシールド
機を設置し、また、発進坑を形成する土留め支保
工材はその上端を地上に突出しないで設け、上部
の腹起しや切張はこの土留め支保工材の内側で前
記発進坑内に設置される背の低いシールド機の左
右側壁板高さよりも上に組むようにし、前記背の
低いシールド機が発進坑を出た所で下部側壁板に
上部側壁板を継足して全体を地上に突出する高さ
のシールド機とすることを要旨とするものであ
る。[Means for Solving the Problems] In order to achieve the above object, the present invention adopts a so-called mountain stop structure, and uses sheet piles etc. as a wall, earth retaining shoring material and H-beam steel etc. to raise or cut the wall. A propulsion jack is installed inside the launch shaft reinforced with steel, and a shield machine with openings at the front and rear ends and top is installed, and earth and sand in front of the launch shaft is excavated and removed from the front or top opening of the shield machine. The propulsion jack of the shield machine is extended to apply a reaction force to the reaction wall in the launch shaft to advance the shield machine from the launch shaft, and the first underground structure made of a concrete box or the like is suspended from above. It is set behind the retracted propulsion jack in the tail of the shield machine, and is further excavated from the front or top of the front part of the shield machine, and the propulsion jack is extended to apply reaction force to the first underground structure and reaction wall. Then, the shield machine is moved forward, and the new underground structure is lowered and placed in the front row of the existing underground structure, and the same excavation, installation of the underground structure, and advancement process are carried out. In the open shield construction method in which a shield machine repeatedly excavates, the shield machine consists of left and right side wall plates made up of upper and lower divided bodies, and of the left and right side wall plates made up of the above-mentioned upper and lower divided bodies in the starting shaft, it is composed only of the lower side wall plate. In addition, the earth retaining shoring material that forms the starting shaft is installed so that its upper end does not protrude above the ground, and the upper part is raised and cut inside the earth retaining shoring material. The left and right side wall plates are assembled above the height of the short shield machine installed in the launch shaft, and the upper side wall plate is added to the lower side wall plate at the point where the short shield machine exits the launch shaft. The main idea is to make the entire structure a shield aircraft with a height that protrudes above the ground.
本発明によれば、発進坑内にセツトするシール
ド機は分割体で構成される左右側壁板が下部側壁
板で構成した低い高さのものであり、発進坑を形
成する土留め支保工材はその上端を地上に突出し
ないで設け、上部の腹起しや切張もこの土留め支
保工材の内側でシールド機の左右側壁板高さより
も上に組むことができる。
According to the present invention, the shield machine to be set in the starting shaft has a low height, with the left and right side wall plates composed of divided bodies consisting of the lower side wall plate, and the earth retaining shoring material forming the starting shaft is of a low height. The upper end is provided so that it does not protrude above the ground, and the upper part can be raised and cut inside the earth retaining shoring material, and can be assembled above the height of the left and right side wall plates of the shield machine.
このようにして、背の低いシールド機を腹起し
や切張をくぐるように発進させ、シールド機は発
進坑を出た所で下部側壁板に上部側壁板を継足せ
ば、側壁板はオープンシールドに必要な全体を地
上に突出する高さとすることができる。 In this way, the short shield machine is launched by going through the belly rise and the cut-off, and when the shield machine exits the launch shaft, the upper side wall plate is attached to the lower side wall plate, and the side wall plate is opened. The entire height required for the shield can be made to protrude above the ground.
以下、図面について本発明の実施例を詳細に説
明する。
Embodiments of the present invention will be described in detail below with reference to the drawings.
先に本発明のオープンシールド工法で使用する
オープンシールド機１について述べると、第３図
に示すようにオープンシールド機１は、左右の側
壁板１ａ，１ｂはその先端を断面三角形状の刃口
２を含めて上部側壁板１a2，１b2と下部側壁板１
a1，１b1の上下の分割体の結合として構成するよ
うにする。これら上部側壁板１a2，１b2と下部側
壁板１a1，１b1との結合方法は種々考えれるが、
ブラケツト１３や当板を設けてボルト止めするの
が一例である。 First, the open shield machine 1 used in the open shield construction method of the present invention will be described. As shown in FIG. Including upper side wall plate 1a 2 , 1b 2 and lower side wall plate 1
Construct it as a combination of the upper and lower parts of a 1 and 1b 1 . There are various ways to connect these upper side wall plates 1a 2 and 1b 2 and lower side wall plates 1a 1 and 1b 1 , but
An example is to provide a bracket 13 or a backing plate and fasten with bolts.
さらに、隔壁３もこれらの側壁板に合わせて上
下分割できるようにする。 Furthermore, the partition wall 3 can also be divided into upper and lower parts according to these side wall plates.
その他の構成は従来例と同じであり、図示は省
略するが、第４図〜第６図に示すように内部に推
進ジヤツキを設け、左右の下部側壁板１a1，１b1
はその間を底板１ｃで連結し、前後端面及び上面
を開口したＵ型シールド機である。 Other configurations are the same as the conventional example, and although not shown, a propulsion jack is provided inside as shown in FIGS. 4 to 6, and the left and right lower side wall plates 1a 1 , 1b 1
This is a U-shaped shield machine with a bottom plate 1c connecting the two, and openings at the front and rear end faces and the top face.
次に、前記オープンシールド機１を用いた本発
明のオープンシールド工法について説明する。 Next, the open shield construction method of the present invention using the open shield machine 1 will be explained.
第１図、第２図は本発明後方の工程を示すもの
で、発進坑７は従来と同じく山止め構造を採用し
てシートパイル等により壁体状とした土留め支保
工材８とＨ型鋼等による腹起し１１や切張１２で
補強するが、土留め支保工材８の上端は地上ライ
ンとして上方に突出しないようにする。 Figures 1 and 2 show the rear process of the present invention, where the starting shaft 7 adopts the same structure as the conventional one, and is made of earth retaining shoring material 8 made of sheet piles etc. into a wall shape, and H-shaped steel. However, the upper end of the earth retaining shoring material 8 should not protrude upward as a ground line.
そして、この土留め支保工材８の内側で上端付
近に腹起し１１や切張１２を設けた。 Then, on the inside of this earth retaining shoring material 8, a bulge 11 and a shear 12 are provided near the upper end.
このようにして発進坑７を形成し、その内部に
オープンシールド機１を組立セツトするが、左右
の側壁板は下部側壁板１a1，１b1のみで構成した
背の低いものとし、腹起し１１や切張１２の高さ
よりも背の低いものとする。 In this way, the launch shaft 7 is formed, and the open shield machine 1 is assembled and set inside it.The left and right side wall plates are short ones consisting only of the lower side wall plates 1a 1 and 1b 1 , and It shall be shorter than the height of 11 and 12.
発進坑７の土留め支保工材８は部分的に除去し
てから、シールド機の前面又は上面開口より発進
坑７の前方の土砂を掘削し、かつ排土する。そし
て、スペーサー（図示せず）を介在させてシール
ド機１の推進ジヤツキ２を伸長して発進坑７内の
反力壁（図示せず）に反力をとつてシールド機１
を前進させ、この前進分にコンリート函体等によ
る第１番目の地中構造物４を上方から吊り降し、
シールド機１のテール部１ｄ内で縮めた推進ジヤ
ツキ２の後方にセツトする。 After the earth retaining shoring material 8 of the starting shaft 7 is partially removed, earth and sand in front of the starting shaft 7 is excavated and discharged from the front or top opening of the shield machine. The shield machine 1
is advanced, and the first underground structure 4 made of a concrete box or the like is suspended from above by the amount of this advance,
It is set behind the propulsion jack 2 which is retracted within the tail portion 1d of the shield machine 1.
次いで、同様にシールド機１の前面又は上面か
らシヤベル、オーガ、バケツト等の掘削手段で土
砂を掘削しかつ排土してシールド機１を前進さ
せ、前記第１番目の地中構造物の前に第２番目の
地中構造物を吊り降す。 Next, earth and sand are similarly excavated from the front or upper surface of the shielding machine 1 using excavating means such as a shovel, an auger, a bucket, etc., and the earth is discharged, and the shielding machine 1 is moved forward and placed in front of the first underground structure. Lower the second underground structure.
このようにして背の低いシールド機１が腹起し
１１や切張１２をくぐるようにして発進坑７から
完全に出たならば、下部側壁板１a1，１b1に上部
側壁板１a2，１b2を継足して側壁板の全長高をオ
ープンシールドに必要な地上に突出する高さとす
る。 In this way, once the short shield machine 1 has completely come out of the launch shaft 7 by passing through the belly riser 11 and the cut bar 12, the lower side wall plates 1a 1 , 1b 1 are replaced by the upper side wall plates 1a 2 , Add 1b and 2 to make the total length and height of the side wall plate the height required for the open shield to protrude above the ground.
この継足しに際しては、第２図β分だけの掘り
下げが生じるが、これは比較的浅いものであり、
土留めもほとんど必要がなく、仮にするとしても
補助土留め程度で足りる。 When this addition is made, digging will occur by the amount β in Figure 2, but this is relatively shallow;
There is almost no need for earth retaining, and even if it is, auxiliary earth retaining is sufficient.
以下、従来の工程と同じく掘進及び地中構造物
のセツト工程を繰返して、順次地中構造物４を縦
列に地中に埋設し、他方の地中構造物４上に埋戻
し５を施し、オープンシールド機１が到達坑まで
達したならばこれを撤去して工事を完了する。 Thereafter, the excavation and underground structure setting steps are repeated in the same way as in the conventional process, and the underground structures 4 are sequentially buried in the ground in columns, and backfilling 5 is performed on the other underground structure 4. When the open shield machine 1 reaches the reaching shaft, it is removed and the construction is completed.
以上述べたように本発明のオープンシールド工
法は、発進坑を地上から上に突出しないで設ける
ことができるので、材料費も減少するとともに、
発進坑内への人の出入りも楽になり、発進坑の開
口に蓋をして交通の要に供することなどもできる
ものである。
As described above, the open shield construction method of the present invention allows the launching shaft to be installed without protruding above the ground, reducing material costs and
It also makes it easier for people to enter and exit the starting shaft, and the opening of the starting shaft can be covered and used as a transportation hub.
第１図、第２図は本発明のオープンシールド工
法の１実施例を示す各工程の説明図、第３図は使
用するオープンシールド機の斜視図、第４図、第
５図はオープンシールド工法の一般例を示す縦断
側面図、第６図は同上横断平面図、第７図は従来
の発進坑の平面図、第８図は同上縦断側面図であ
る。
１……オープンシールド機、１ａ，１ｂ……側
壁板、１a1，１b1……下部側壁板、１a2，１b2…
…上部側壁板、１ｃ……底板、１ｄ……テール
部、２……推進ジヤツキ、３……隔壁、４……地
中構造物、５……埋戻し、６……掘削手段、７…
…発進坑、８……土留め支保工材、９……反力
壁、１０……スペーサー、１１……腹起し、１２
……切張、１３……ブラケツト。
Figures 1 and 2 are explanatory diagrams of each process showing one embodiment of the open shield construction method of the present invention, Figure 3 is a perspective view of the open shield machine used, and Figures 4 and 5 are open shield construction methods. 6 is a cross-sectional plan view of the same, FIG. 7 is a plan view of a conventional starting shaft, and FIG. 8 is a vertical cross-sectional side view of the same. 1...Open shield machine, 1a, 1b...Side wall plate, 1a 1 , 1b 1 ...Lower side wall plate, 1a 2 , 1b 2 ...
... Upper side wall plate, 1c ... Bottom plate, 1d ... Tail section, 2 ... Propulsion jack, 3 ... Partition wall, 4 ... Underground structure, 5 ... Backfill, 6 ... Excavation means, 7 ...
... Starting shaft, 8 ... Earth retaining shoring material, 9 ... Reaction wall, 10 ... Spacer, 11 ... Raising, 12
... Kiribari, 13... Bracket.
Claims (1)
等により壁体状とした土留め支保工材とＨ型鋼等
による腹起しや切張で補強した発進坑内に、内部
に推進ジヤツキを設け、前後端及び上面を開口し
たシールド機を設置して、シールド機の前面又は
上面開口より発進坑の前方の土砂を掘削排土し
て、シールド機の推進ジヤツキを伸長して発進坑
内の反力壁に反力をとつてシールド機を発進坑か
ら前進させ、コンクリート函体等による第１番目
の地中構造物を上方から吊り降してシールド機の
テール部内で縮めた推進ジヤツキの後方にセツト
し、さらにシールド機前面又は前部上面から掘削
しかつ推進ジヤツキを伸長して第１番目の地中構
造物及び反力壁に反力をとつてシールド機を前進
させ、この前進分に新たな地中構造物を吊り降し
て既設地中構造物の最前列に位置させ、以下同様
な掘削、地中構造物の設置、前進工程を繰返して
シールド機を掘削させるオープンシールド工法に
おいて、シールド機は左右側壁板を上下の分割体
で構成し、発進坑内に前記上下の分割体で構成し
た左右側壁板のうち、下部側壁板のみで構成した
背の低いシールド機を設置し、また、発進坑を形
成する土留め支保工材はその上端を地上に突出し
ないので設け、上部の腹起しや切張はこの土留め
支保工材の内側で前記発進坑内に設置される背の
低いシールド機の左右側壁板高さよりも上に組む
ようにし、前記背の低いシールド機が発進坑を出
た所で下部側壁板に上部側壁板を継足して全体を
地上に突出する高さのシールド機とすることを特
徴としたオープンシールド工法。1 The launch shaft is reinforced with earth retaining shoring material in the form of walls made of sheet piles, etc., using a so-called heap-retaining structure, and raised and cut sections made of H-shaped steel, etc. Propulsion jacks are installed inside, and propulsion jacks are installed inside the A shield machine with an open top is installed, and earth and sand in front of the launch shaft is excavated and removed from the front or top opening of the shield machine, and the propulsion jack of the shield machine is extended to react against the reaction wall inside the launch shaft. Using force, the shield machine is advanced from the launch shaft, the first underground structure made of a concrete box, etc. is suspended from above and set behind the propulsion jack, which has been retracted within the tail of the shield machine, and then The shield machine is excavated from the front or upper front surface of the shield machine, and the propulsion jack is extended to take the reaction force from the first underground structure and the reaction wall to move the shield machine forward. In the open shield construction method, the object is lowered and placed in the front row of the existing underground structure, and the shield machine excavates by repeating the same excavation, installation of the underground structure, and advance process. The plate is composed of upper and lower divided bodies, and a short shield machine consisting of only the lower side wall plate of the left and right side wall plates composed of the upper and lower divided bodies is installed in the launch shaft, and the launch shaft is also formed. The earth retaining shoring material is provided so that its upper end does not protrude above the ground, and the upper part is raised and cut on the left and right side wall plates of the short shield machine installed in the starting shaft inside the earth retaining shoring material. It is assembled above the height of the shield machine, and at the point where the short shield machine exits the launch shaft, an upper side wall plate is added to the lower side wall plate to make the entire shield machine with a height that protrudes above the ground. Open shield construction method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27316989A JPH03137318A (en) | 1989-10-20 | 1989-10-20 | Open shield construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27316989A JPH03137318A (en) | 1989-10-20 | 1989-10-20 | Open shield construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03137318A JPH03137318A (en) | 1991-06-11 |
| JPH0575880B2 true JPH0575880B2 (en) | 1993-10-21 |
Family
ID=17524060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27316989A Granted JPH03137318A (en) | 1989-10-20 | 1989-10-20 | Open shield construction method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03137318A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5536506A (en) * | 1978-09-02 | 1980-03-14 | Nippon Koki Kk | Opennshielded excavator |
-
1989
- 1989-10-20 JP JP27316989A patent/JPH03137318A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5536506A (en) * | 1978-09-02 | 1980-03-14 | Nippon Koki Kk | Opennshielded excavator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03137318A (en) | 1991-06-11 |
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