JPH05287982A - Excavation of tunnel and its drilling device of rectangular section - Google Patents
Excavation of tunnel and its drilling device of rectangular sectionInfo
- Publication number
- JPH05287982A JPH05287982A JP4082240A JP8224092A JPH05287982A JP H05287982 A JPH05287982 A JP H05287982A JP 4082240 A JP4082240 A JP 4082240A JP 8224092 A JP8224092 A JP 8224092A JP H05287982 A JPH05287982 A JP H05287982A
- Authority
- JP
- Japan
- Prior art keywords
- rotary
- drilling
- tunnel
- drilling machine
- machine body
- 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
Landscapes
- Lining And Supports For Tunnels (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、軟弱地山の崩壊を防止
するためプレライニングを形成しながらトンネル掘削す
る方法とその方法に好適に用いられる削孔装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for excavating a tunnel while forming a pre-lining to prevent collapse of soft ground and a drilling device suitably used for the method.
【０００２】[0002]
【従来の技術】現在採用されているトンネル掘削工法に
は、全断面工法、側壁または底設導坑先進上部半断面工
法、上部半断面先進工法などのいわゆる在来工法の他、
比較的新工法のベンチカット工法、ＮＡＴＭ工法などが
あり、掘削する地山の状況、トンネル断面の規模、延
長、勾配、さらに経済性、安全性、工期などに応じて採
用する工法が選定されている。しかしながら、前述した
トンネル掘削工法により、すべての地山条件、地形、各
種環境条件等に対応できるものではなく、このため種々
の補助工法を併用しながら掘削を行っている。2. Description of the Related Art Tunnel excavation methods that are currently used include conventional methods such as full section method, side wall or bottom tunnel advanced upper half section method and upper half section advanced method.
There are relatively new methods such as the bench cut method and the NATM method, and the method to be adopted is selected according to the situation of the ground to be excavated, the size, extension and slope of the tunnel section, as well as economic efficiency, safety and the construction period. There is. However, the above-mentioned tunnel excavation method cannot be applied to all natural ground conditions, topography, various environmental conditions, etc. Therefore, excavation is performed by using various auxiliary construction methods together.
【０００３】一般的に前記補助工法には、フォアパイリ
ング工法、プレライニング工法、薬液注入工法、地下水
位低下工法、凍結工法などの工法が挙げられる。前記フ
ォアパイリング工法は、削孔機等により鉄筋、ロックボ
ルト、または単管パイプをトンネル切羽の周囲より斜め
前方方向に打ち込んで地山の崩壊を防ぐものであり、前
記プレライニング工法は、切羽部分を掘削する前に、ト
ンネル切羽の前方にトンネル周囲に渡ってアーチ状の仮
支保を形成して地山崩壊を防止しながら掘削を行うもの
である。図６は、従来のプレライニング工法において、
トンネル周方向回りに連続した柱列式のアーチ状仮支保
を形成するための削孔装置であり、図７は前記柱列式の
アーチ状仮支保の正面図である。Generally, examples of the auxiliary construction method include a fore-piling construction method, a pre-lining construction method, a chemical injection method, a groundwater level lowering construction method and a freezing construction method. The fore piling method is to prevent collapse of the ground by driving a reinforcing rod, a rock bolt, or a single pipe in a diagonally forward direction from the periphery of the tunnel face by a hole drilling machine or the like, and the pre-lining method is a face part. Before excavation, an arch-shaped temporary support is formed in front of the face of the tunnel over the circumference of the tunnel to prevent the ground from collapsing. FIG. 6 shows a conventional prelining method,
FIG. 7 is a front view of the columnar arch temporary support, which is a drilling device for forming a columnar arch temporary support continuous around the tunnel circumferential direction.
【０００４】たとえば、前記ＮＡＴＭ工法により軟弱地
山を掘削する場合、切羽の肌落ち程度の自立性を有すれ
ば前記フォアパイリング工法と併用し、さらに自立性の
低い地山であれば前記プレライニング工法、薬液注入工
法等を併用するなど、地山状況等に応じて適宜の補助工
法が組み合わされてトンネル掘削が行われている。For example, when excavating a soft ground by the NATM method, it is used in combination with the forepiling method if it has self-sustaining property such as face removal, and if it is low in self-sustaining property, it is pre-lined. Tunnel excavation is performed by combining appropriate auxiliary construction methods depending on the ground conditions, such as using the construction method and the chemical liquid injection construction method together.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、鉄筋等
の打込みを行うフォアパイリング工法の場合は、トンネ
ル横断方向に連続性がないため、特に粘着性がなく、緩
みの著しい軟弱地盤の場合にはその効果が小さい。ま
た、これら各種補助工法に用いる装置類は、図６のよう
に、専用機を用いる場合が多く、設備的にも大掛かりな
ものとなるため、設置に手間がかかるとともに、その装
置に要した費用も多大であった。さらに、図７のよう
に、トンネル周回りに柱列式のアーチ状仮支保を形成す
る場合、１杭毎の施工となるため、施工に時間がかかり
過ぎるとともに、アーチ状仮支保全体の強度も不十分な
ものであった。However, in the case of the fore-piling method for driving in reinforcing bars, since there is no continuity in the tunnel crossing direction, there is no particular stickiness, and in the case of extremely loose ground, The effect is small. Further, as shown in FIG. 6, the devices used in these various auxiliary construction methods often use dedicated machines, which requires a large amount of equipment. Therefore, it takes a lot of time to install the equipment and the cost required for the equipment. Was also great. Furthermore, as shown in FIG. 7, when forming a columnar arch-shaped temporary support around the circumference of the tunnel, the construction is performed for each pile, so the construction takes too much time and the strength of the arch-shaped temporary support body is also high. It was inadequate.
【０００６】そこで、本発明の主たる課題は、強度的に
優れたアーチ状仮支保を効率良く、短期間で形成し、ま
た装置的にもコンパクトであり、低コストとなるトンネ
ル掘削方法とそのための削孔装置を提供するものであ
る。Therefore, a main object of the present invention is to provide a tunnel excavation method which can efficiently form an arch-shaped temporary support having excellent strength in a short period of time, is compact in terms of equipment, and is low in cost, and a method therefor. A drilling device is provided.
【０００７】[0007]
【課題を解決するための手段】前記課題は、トンネル掘
削に当り、予めトンネル切羽の前方部分であって、その
周方向回りに、矩形断面削孔装置により、順次スリット
状の透かし溝を形成するとともに、該透かし溝部分にグ
ラウト材を充填して、多角形状に連続したアーチ状仮支
保を形成し、地山崩壊を防ぎながらトンネル掘削を行う
ことで解決できる。In the tunnel excavation, the above-mentioned problem is formed in advance in the front portion of the tunnel face by forming a slit-shaped open groove around the circumferential direction of the face by a rectangular cross-section drilling device. At the same time, the problem can be solved by filling the open groove portion with grout material to form an arch-shaped temporary support that is continuous in a polygonal shape, and performing tunnel excavation while preventing ground collapse.
【０００８】前記矩形断面削孔装置としては、バックホ
ーショベルに対して着脱自在のアタッチメント方式の削
孔装置であって、略直方形の削孔機本体と、この削孔機
本体の基端部に設けられ前記バックホーショベルに対し
て装着するためのアタッチメント部であって、先方側の
削孔機本体を回動自在に支持する回転ヘッドと、前記削
孔機本体の一部と回転ヘッドの一部とを相互に連結し、
削孔方向角度を調整するための角度調整用ジャッキとに
より構成され、前記削孔機本体は、両側部分に削孔方向
を回転中心として回転自在の伝動用回転ロッドを備え、
その前面両端部分に前記伝動用回転ロッドによって直接
または間接的に駆動される切削用回転ビットを備え、こ
れら両切削用回転ビットの中間部に前記伝動用回転ロッ
ドの少なくとも一方に対して連絡し連動して回転するス
クリューカッターを備え、さらに前記スクリューカッタ
ーによる土砂移動方向側の前記伝動用回転ロッドに螺旋
翼を固設して掘削土砂搬送用スクリューコンベアとした
矩形断面削孔装置が好適に用いられる。また、好ましく
は、削孔後の空間部分にグラウト材を注入するための注
入管を備えるものである。The rectangular cross-section drilling device is an attachment-type drilling device that can be attached to and detached from a backhoe excavator, and has a substantially rectangular parallelepiped drilling machine body and a base end portion of the drilling machine body. An attachment portion provided for mounting on the backhoe shovel, the rotary head rotatably supporting the body of the drilling machine on the front side, a part of the drilling machine main body and a part of the rotary head. Interconnects and
And a jack for adjusting the angle for adjusting the drilling direction angle, wherein the drilling machine main body is provided with a transmission rotary rod rotatable on both sides in the drilling direction as a rotation center.
At both end portions of the front surface thereof, rotary cutting bits driven directly or indirectly by the rotary rotating rods for transmission are provided, and an intermediate portion of both rotary rotary bits for cutting is connected to at least one of the rotary rotary rods for transmission and interlocked therewith. A rectangular cross-section drilling device that is equipped with a screw cutter that rotates and further has a spiral blade fixed to the rotary shaft for transmission on the side of the earth and sand moving direction by the screw cutter and used as a screw conveyor for excavating earth and sand. .. Further, preferably, an injection pipe for injecting the grout material is provided in the space portion after drilling.
【０００９】[0009]
【作用】本発明においてプレライニングとしてトンネル
周方向に形成される多角形状のアーチ状仮支保は、横断
方向に強固に連続され、かつ強度および剛性に優れ、作
用土圧を分散・迂回させ、切羽への作用荷重を軽減する
ため、たとえ軟弱な地盤であっても安定的にこれを保持
する。また、矩形断面削孔機によるブロック単位の削孔
であるため、作業が効率化し、短期間で形成することが
できる。In the present invention, the polygonal arch-shaped temporary support which is formed as a pre-lining in the circumferential direction of the tunnel is strongly continuous in the transverse direction and is excellent in strength and rigidity, disperses and bypasses the working earth pressure, In order to reduce the acting load on the ground, it holds it stably even on soft ground. Further, since the holes are drilled in block units by the rectangular cross-section drilling machine, the work efficiency is improved and the drilling can be performed in a short period of time.
【００１０】また、用いる矩形断面削孔装置は、バック
ホーに対して着脱自在の簡易な削孔装置であって、汎用
性に富み、設置に手間取ることなく、コスト的にも低廉
なものとなる。The rectangular cross-section drilling device used is a simple drilling device that can be attached to and detached from the backhoe, is versatile, does not require time and effort for installation, and is low in cost.
【００１１】[0011]
【実施例】以下、本発明を実施例に基づき詳説する。図
１は、本発明に係る矩形断面削孔装置の全体側面図であ
る。本発明に係る矩形断面削孔機本体３は、バックホー
１のブーム先端に対して着脱自在のアタッチメント式の
削孔機であり、その基部に設けられた回転ヘッド２を介
して取り付けられる。前記回転ヘッド２は、先方の削孔
機本体３を回動自在に支持し、トンネル軸方向回りの傾
動により、トンネル周方向にどの位置であっても、周方
向に沿った矩形断面孔を形成することができるようにな
っている。また、前記回転ヘッド２の一部と前記矩形断
面削孔機１の一部とを相互に連結する角度調整用ジャッ
キ４が設けられ、掘削方向角度が調整自在となってい
る。EXAMPLES The present invention will be described in detail below based on examples. FIG. 1 is an overall side view of a rectangular cross-section drilling device according to the present invention. The rectangular cross-section drilling machine body 3 according to the present invention is an attachment-type drilling machine that is attachable to and detachable from the boom tip of the backhoe 1, and is attached via a rotary head 2 provided at the base thereof. The rotary head 2 rotatably supports the drilling machine main body 3 and forms a rectangular cross-section hole along the circumferential direction at any position in the tunnel circumferential direction by tilting around the tunnel axial direction. You can do it. Further, an angle adjusting jack 4 is provided for interconnecting a part of the rotary head 2 and a part of the rectangular cross-section drilling machine 1, and the excavation direction angle can be adjusted.
【００１２】前記削孔機本体３は詳細には、図２〜図４
に示されるように、函体３０内部の両側部分に沿って中
空部３０Ａ、３０Ｂがそれぞれ形成され、その一方に切
削用回転ビット３３の伝動用回転ロッド３５が配設され
るとともに、他方に切削用回転ビット３４の伝動用回転
ロッドをも兼ねた掘削土砂の搬送用スクリューコンベア
３２が配設されている。前記伝動用回転ロッド３５は、
基端側スプロケット３５ｂが切削用回転ビット用モータ
３８の原動軸のスプロケット３８ａとチェーンにより連
結され、前記モータ３８の回転が伝えられ、先端側のベ
ベルギア３５ａ、３６、３３ａを介して切削用回転ビッ
ト３３を回転するようになっている。一方、他端側のス
クリューコンベア３２も、同様に、スクリューコンベア
用モータ３７のスプロケット３７ａの回転が、スクリュ
ーコンベア３２の基端側スプロケット３２ｂに伝達さ
れ、スクリューコンベア３２を土砂搬出方向に回転させ
るようになっている。前記スクリューコンベア３２の先
端にはベベルギア３２ａが固着され、これと噛み合うベ
ベルギア３１ａ，３４ａを介して切削用回転ビット３４
を回転するようになっている。前記切削用回転ビット３
３と切削用回転ビット３４の中間部分には、スクリュー
カッター３１が配設され、このスクリューカッター３１
の回転軸３１ｂの端部に固着されたベベルギア３１ａが
前記スクリューコンベア３２のベベルギア３１ａおよび
切削用回転ビット３４のベベルギア３４ａと噛合してお
り、スクリューコンベア３２の回転に連動して回転する
ようになっている。かくして、矩形断面削孔機３の先端
部分において、切削用回転ビット３３、３４およびスク
リューカッター３１が同時に駆動され、掘削と同時に掘
削された土砂が切削用回転ビット３４側に移動され、さ
らにスクリューコンベア３２により削孔機本体３の基端
側に移動されて、順次連続的に排出される。The hole punching machine main body 3 will be described in detail with reference to FIGS.
As shown in FIG. 3, hollow portions 30A and 30B are formed along both side portions inside the box 30, and the transmission rotary rod 35 of the cutting rotary bit 33 is disposed on one of the hollow portions 30A and 30B, and the other on the other side. A screw conveyor 32 for carrying excavated earth and sand, which also serves as a rotary rod for transmission of the rotary bit 34 for use in excavation, is provided. The transmission rotary rod 35 is
The sprocket 35b on the base end side is connected to the sprocket 38a of the driving shaft of the motor 38 for cutting rotary bit by a chain, the rotation of the motor 38 is transmitted, and the rotary bit for cutting is transmitted via the bevel gears 35a, 36, 33a on the tip side. It is designed to rotate 33. On the other hand, in the screw conveyor 32 on the other end side, similarly, the rotation of the sprocket 37a of the motor 37 for the screw conveyor is transmitted to the sprocket 32b on the base end side of the screw conveyor 32 to rotate the screw conveyor 32 in the earth and sand carrying-out direction. It has become. A bevel gear 32a is fixed to the tip of the screw conveyor 32, and a cutting rotary bit 34 is provided via bevel gears 31a and 34a meshing with the bevel gear 32a.
Is designed to rotate. Rotating bit for cutting 3
A screw cutter 31 is disposed in an intermediate portion between the cutting rotary bit 34 and the cutting rotary bit 34.
The bevel gear 31a fixed to the end of the rotary shaft 31b of the rotary shaft 31b meshes with the bevel gear 31a of the screw conveyor 32 and the bevel gear 34a of the cutting rotary bit 34, and rotates in association with the rotation of the screw conveyor 32. ing. Thus, at the tip of the rectangular cross-section drilling machine 3, the rotary cutting bits 33, 34 and the screw cutter 31 are simultaneously driven, and the earth and sand excavated at the same time as the excavation are moved to the rotary cutting bit 34 side. It is moved to the base end side of the boring machine body 3 by 32 and is sequentially and continuously discharged.
【００１３】さらに、函体３０側端部の中空部３０Ａに
は、グラウト注入管３９が配設されており、管軸方向に
進退自在となっている。切削用回転ビット３３の回転掘
削時には後退状態とし、掘削が完了しグラウト材を注入
する際には進出させて、切削用回転ビット３３に形成さ
れた注入孔３３ｂより地盤内の空隙部分にグラウト材を
充填できるようになっている。Further, a grout injection pipe 39 is provided in the hollow portion 30A at the end portion on the side of the box body 30 and is movable back and forth in the pipe axis direction. The rotary bit 33 for cutting is set in a retracted state at the time of rotary excavation, and is advanced when pouring grout material after the completion of excavation, and the grout material is introduced into the void portion in the ground through the injection hole 33b formed in the rotary bit 33 for cutting. Can be filled.
【００１４】実際のトンネル施工に際しては、トンネル
周方向回りに連続したアーチ状のコンクリート支保を施
工する場合、図１に示されるように、施工ブロック毎
に、前述した矩形断面削孔機により、切羽部分に透かし
溝ｈを形成した後、引抜き時にグラウト材Ｓを充填して
板状体を順次形成し、最終的に図５に示されるように、
板状体Ｓ1 〜Ｓn によって多角形状に連続したアーチ状
仮支保を形成した後、トンネル掘削を行う。In the actual tunnel construction, when constructing a continuous arch-shaped concrete support around the circumference of the tunnel, as shown in FIG. After forming the watermark groove h in the portion, the grout material S is filled at the time of drawing to sequentially form plate-like bodies, and finally, as shown in FIG.
After the arch-shaped temporary support which is continuous in a polygonal shape is formed by the plate-like bodies S 1 to S n , tunnel excavation is performed.
【００１５】[0015]
【発明の効果】以上詳説のとおり、本発明によれば、強
度的に優れたアーチ状仮支保を効率良く、短期間で形成
することができる。また、そのための矩形断面削孔装置
も、アタッチメント方式の簡易なものであるため、汎用
性に富み、設備的にも安価なものとなる。As described above in detail, according to the present invention, it is possible to efficiently form an arch-shaped temporary support having excellent strength in a short period of time. Further, since the rectangular cross-section drilling device for that purpose is also a simple attachment type, it is versatile and inexpensive in terms of equipment.
【図１】本発明に係る矩形断面削孔装置の全体側面図で
ある。FIG. 1 is an overall side view of a rectangular cross-section drilling device according to the present invention.
【図２】矩形断面削孔装置の縦断面図である。FIG. 2 is a vertical cross-sectional view of a rectangular cross-section drilling device.
【図３】矩形断面削孔装置の水平断面図である。FIG. 3 is a horizontal sectional view of the rectangular cross-section drilling device.
【図４】矩形断面削孔装置の正面からの視図である。FIG. 4 is a front view of the rectangular cross-section drilling device.
【図５】本発明法による多角形状に連続したアーチ状仮
支保の正面図である。FIG. 5 is a front view of a polygonal continuous arch-shaped temporary support according to the method of the present invention.
【図６】従来より用いられている削孔装置の側面図であ
る。FIG. 6 is a side view of a conventional hole drilling device.
【図７】柱列式のアーチ状仮支保の正面図である。FIG. 7 is a front view of a columnar arch-shaped temporary support.
１…バックホーショベル、２…回転ヘッド、３…矩形断
面削孔機本体、４…角度調整用ジャッキ、３１…スクリ
ューカッター、３２…搬送用スクリューコンベア、３３
・３４…切削用回転ビットDESCRIPTION OF SYMBOLS 1 ... Backhoe shovel, 2 ... Rotating head, 3 ... Rectangular cross-section drilling machine main body, 4 ... Angle adjustment jack, 31 ... Screw cutter, 32 ... Conveying screw conveyor, 33
・ 34… Rotating bit for cutting
フロントページの続き (72)発明者 目時 康男 東京都中央区日本橋本町４ー12ー20 佐藤 工業株式会社内 (72)発明者 山本 稔 東京都町田市玉川学園１ー15ー２Front page continuation (72) Inventor Yasuo Mitoki 4-12-20 Nihonbashi Honcho, Chuo-ku, Tokyo Inside Sato Industry Co., Ltd. (72) Minoru Yamamoto 1-15-2 Tamagawa Gakuen, Machida, Tokyo
Claims (3)
前方部分であって、その周方向回りに、矩形断面削孔装
置により、順次スリット状の透かし溝を形成するととも
に、該透かし溝部分にグラウト材を充填して、多角形状
に連続したアーチ状仮支保を形成し、地山崩壊を防ぎな
がらトンネル掘削を行うことを特徴とするトンネル掘削
方法。1. When excavating a tunnel, a slit-shaped watermark groove is sequentially formed in a front portion of a tunnel face around the circumferential direction by a rectangular cross-section drilling device, and the grout is formed in the watermark groove portion. A tunnel excavation method characterized by filling a material to form a polygonal continuous arch-shaped temporary support and performing tunnel excavation while preventing ground collapse.
タッチメント方式の削孔装置であって、 略直方形の削孔機本体と、この削孔機本体の基端部に設
けられ前記バックホーショベルに対して装着するための
アタッチメント部であって、先方側の削孔機本体を回動
自在に支持する回転ヘッドと、前記削孔機本体の一部と
回転ヘッドの一部とを相互に連結し、削孔方向角度を調
整するための角度調整用ジャッキとにより構成され、 前記削孔機本体は、両側部分に削孔方向を回転中心とし
て回転自在の伝動用回転ロッドを備え、その前面両端部
分に前記伝動用回転ロッドによって直接または間接的に
駆動される切削用回転ビットを備え、これら両切削用回
転ビットの中間部に前記伝動用回転ロッドの少なくとも
一方に対して連絡し連動して回転するスクリューカッタ
ーを備え、さらに前記スクリューカッターによる土砂移
動方向側の前記伝動用回転ロッドに螺旋翼を固設して掘
削土砂搬送用スクリューコンベアとしたことを特徴とす
る矩形断面削孔装置。2. An attachment type drilling device which is attachable to and detachable from a backhoe excavator, comprising a substantially rectangular parallelepiped drilling machine body and a backhoe shovel provided at a base end portion of the drilling machine body. An attachment portion for mounting the rotary head that rotatably supports the drilling machine body on the tip side, and a part of the drilling machine body and a part of the rotary head are interconnected, The drilling machine body is provided with an angle adjusting jack for adjusting the drilling direction angle, and the drilling machine body is provided with transmission rotary rods rotatable on both sides in the drilling direction as rotation centers, and on both front end portions thereof. A rotary bit for cutting which is directly or indirectly driven by the rotary rod for transmission is provided, and an intermediate portion of both rotary bits for cutting is connected to at least one of the rotary rods for transmission to rotate in conjunction therewith. That includes a screw cutter further the rectangular cross-section boring apparatus according to claim and fixed spiral blade that was excavated soil conveying screw conveyor to the power transmission rotary rod of the earth moving direction by the screw cutter.
ための注入管を備えた請求項２記載の矩形断面削孔装
置。3. The rectangular cross-section drilling device according to claim 2, further comprising an injection pipe for injecting grout material into a space portion after drilling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4082240A JP2847272B2 (en) | 1992-04-03 | 1992-04-03 | Drilling equipment with rectangular cross section for tunnel excavation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4082240A JP2847272B2 (en) | 1992-04-03 | 1992-04-03 | Drilling equipment with rectangular cross section for tunnel excavation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05287982A true JPH05287982A (en) | 1993-11-02 |
| JP2847272B2 JP2847272B2 (en) | 1999-01-13 |
Family
ID=13768892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4082240A Expired - Fee Related JP2847272B2 (en) | 1992-04-03 | 1992-04-03 | Drilling equipment with rectangular cross section for tunnel excavation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2847272B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6019897A (en) * | 1983-07-11 | 1985-02-01 | 株式会社奥村組 | Thin wall coating method and apparatus of tunnel |
| JPH03257297A (en) * | 1990-03-07 | 1991-11-15 | Pub Works Res Inst Ministry Of Constr | Prelining structure of tunnel and forming method thereof |
-
1992
- 1992-04-03 JP JP4082240A patent/JP2847272B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6019897A (en) * | 1983-07-11 | 1985-02-01 | 株式会社奥村組 | Thin wall coating method and apparatus of tunnel |
| JPH03257297A (en) * | 1990-03-07 | 1991-11-15 | Pub Works Res Inst Ministry Of Constr | Prelining structure of tunnel and forming method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2847272B2 (en) | 1999-01-13 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |