JPH089272Y2 - Sealing device for middle broken part of multiple shield machine - Google Patents
Sealing device for middle broken part of multiple shield machineInfo
- Publication number
- JPH089272Y2 JPH089272Y2 JP1989146980U JP14698089U JPH089272Y2 JP H089272 Y2 JPH089272 Y2 JP H089272Y2 JP 1989146980 U JP1989146980 U JP 1989146980U JP 14698089 U JP14698089 U JP 14698089U JP H089272 Y2 JPH089272 Y2 JP H089272Y2
- Authority
- JP
- Japan
- Prior art keywords
- seal
- ring
- shield
- groove
- circular
- 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
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、複数の円が部分的に重なり合ったような断
面形状のトンネルを掘削する多連シールド掘進機の中折
れ部シール装置に関する。[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a device for sealing a middle bent portion of a multiple shield machine for excavating a tunnel having a cross-sectional shape such that a plurality of circles partially overlap each other.
シールド掘進機の曲線施工を容易にするため、シール
ド本体を前胴と後胴とに分割し、前胴の後端部に後胴の
縮径された前端部をすきまを持たせてはめ込み、中折れ
部を形成した場合、中折れ部のすきまから機内への土
砂、地下水の侵入を防止するためのシール装置を必要と
する。In order to facilitate the curved construction of the shield machine, the shield body is divided into a front body and a rear body, and the rear end portion of the front body is fitted with a reduced front end portion of the rear body with a gap between them. When the bent portion is formed, a sealing device is required to prevent the intrusion of earth and sand and groundwater into the machine through the clearance of the middle bent portion.
従来、円形トンネル用シールド掘進機における中折れ
部シール装置の代表的な例としては、Ｏリングを用いた
ものがある（実開昭58-172592号）。Conventionally, as a typical example of a seal device for a center broken portion in a shield machine for a circular tunnel, there is one using an O-ring (No. Shokai 58-172592).
多連シールド掘進機の中折れ部シール構造は最近の課
題であるため、従来技術は少ないが、その１つとして、
前後２分割して構成されたシールド本体の後胴の前端部
に途中に凹状部を有しない環状の第１フランジを設け、
前胴の後端部にはこの第１フランジと相似形状で、かつ
第１フランジに外嵌する第２フランジを設け、この第２
フランジの大きさをシールド断面を構成する複数の円の
重複交差位置間に収まるようにし、これら両フランジ間
にシール材を配置したものが実開平1-75195号に記載さ
れている。Since there is a recent problem with the seal structure for the middle broken part of the multiple shield machine, there are few conventional technologies.
An annular first flange having no recessed portion is provided at the front end of the rear body of the shield body that is divided into two parts,
A second flange, which is similar in shape to the first flange and fits over the first flange, is provided at the rear end of the front body.
Japanese Utility Model Laid-Open No. 1-75195 discloses a flange in which the size of the flange is set between overlapping intersections of a plurality of circles constituting a shield cross section and a sealing material is arranged between these flanges.
Ｏリングは最も一般的なシール材で安価であり、取付
部の加工費も安く、また、たわみ代（変形量）を大きく
とれるため、シール材としての信頼性も高いが、中折れ
部に使用する場合、適度の張力を与えた状態で取付けて
おかないと、シールド本体を中折れさせたとき、Ｏリン
グが摺動部分のすきまにはさみ込まれて切断または損傷
することがある。The O-ring is the most common seal material, it is cheap, the processing cost of the mounting part is also low, and the bending allowance (deformation amount) is large, so it is highly reliable as a seal material, but it is used for the middle bent part. In such a case, if the shield body is not attached with a proper tension applied, the O-ring may be caught in the clearance of the sliding portion and cut or damaged when the shield body is bent in the middle.
第５図はＯリングを用いた通常の中折れ部シール構造
を示しており、Ｏリング20は後胴３の前端部3aの外周面
に設けられたシール収納溝21に単に収納されているだけ
である。このようなシール構造において、Ｏリング20は
地山からの圧力Ｐを受けて変形し、それによりシール収
納溝21の底面と前胴２の後端部2aの内周面とに密着して
本来のシール機能を発揮する。したがって、摺動部分で
ある前胴後端部2aと後胴前端部3aのすきまが大きいと、
Ｏリング20のすきまへのはみ出し量も大きくなる。FIG. 5 shows a normal center-folded portion seal structure using an O-ring, and the O-ring 20 is simply stored in a seal storage groove 21 provided on the outer peripheral surface of the front end portion 3a of the rear body 3. Is. In such a seal structure, the O-ring 20 is deformed by receiving the pressure P from the natural ground, thereby closely adhering to the bottom surface of the seal housing groove 21 and the inner peripheral surface of the rear end portion 2a of the front case 2 and originally. Demonstrate the sealing function of. Therefore, if the clearance between the front body rear end 2a and the rear body front end 3a, which are sliding parts, is large,
The amount of protrusion of the O-ring 20 into the clearance also increases.
通常のシールド掘進機では、シールド本体の断面形状
が円形であり、Ｏリング20は張力を与えることによって
シール収納溝21の底面に全周にわたり押し付けられるた
め、中折れ時に摺動部分のすきまにはさみ込まれる可能
性は少ないが、多連シールド掘進機では、例えば第６図
〜第８図に示す２連シールドの場合、シールド本体１を
構成する前胴２と後胴３の断面形状が２つの擬似円形部
1aと隣接する擬似円形部同士を接続する逆円弧部1bとか
らなるまゆ形に形成されており、Ｏリング20を装着する
後胴前端部3aの外周面もまゆ形になっているので、Ｏリ
ング20に張力を与えると、後胴３の逆円弧部では、張力
によりＯリング20がシール収納溝21の底面から離れる方
向（第５図のＦ矢印方向）に動こうとする。このため、
曲線施工終了後、前胴２と後胴３の相対角度がゼロにな
るまで前胴２が第５図のＤ矢印方向に摺動する際、Ｏリ
ング20が摺動部分のすきまにはさみ込まれて損傷しやす
い。In a normal shield machine, the shield body has a circular cross-sectional shape, and the O-ring 20 is pressed against the bottom surface of the seal housing groove 21 over the entire circumference by applying tension. In the multiple shield machine, for example, in the case of the double shield shown in FIG. 6 to FIG. 8, the front body 2 and the rear body 3 forming the shield body 1 have two cross-sectional shapes. Pseudo circular part
It is formed into an eyebrow shape consisting of 1a and an inverted circular arc portion 1b that connects adjacent pseudo-circular portions, and since the outer peripheral surface of the rear trunk front end portion 3a on which the O-ring 20 is mounted is also an eyebrow shape, When tension is applied to the ring 20, the O-ring 20 tries to move in the direction away from the bottom surface of the seal accommodating groove 21 (direction of arrow F in FIG. 5) in the reverse arc portion of the rear body 3 due to the tension. For this reason,
When the front body 2 slides in the direction of the arrow D in FIG. 5 until the relative angle between the front body 2 and the rear body 3 becomes zero after the curve construction is completed, the O-ring 20 is inserted into the clearance of the sliding portion. Easily damaged.
実開平1-75195号の考案では、多連シールド掘進機の
シールド本体を構成する前胴と後胴の接続用フランジを
凹状部のない環状としているので、前述のように中折れ
部のシール材が逆円弧部で摺動部分のすきまにはさみ込
まれるという問題はないが、この構成によると次のよう
な別の問題が生じる。In the invention of No. 1-75195, since the connecting flanges of the front body and the rear body forming the shield main body of the multiple shield machine have an annular shape without a concave portion, as described above, the sealing material for the middle bent portion is used. Although there is no problem of being caught in the clearance of the sliding portion at the reverse circular arc portion, this configuration causes another problem as follows.
（１）中折れ部のフランジ構造が複雑になる。(1) The flange structure of the middle bent portion becomes complicated.
（２）フランジにより機内スペースが狭められる。(2) The flange reduces the space inside the machine.
（３）中折れジャッキの位置がシールドジャッキより内
側になるので、曲線施工時、シールドジャッキの片押し
によるモーメントに対抗させるために中折れジャッキの
容量あるいは本数をふやす必要があり、コスト高にな
る。(3) Since the position of the center-folded jack is inside the shield jack, it is necessary to increase the capacity or number of the center-folded jacks in order to counter the moment due to one-sided pushing of the shield jack at the time of curve construction, resulting in high cost. .
本考案の目的は、上記のような従来技術の問題点を解
決した多連シールド掘進機の中折れ部シール装置を提供
することにある。An object of the present invention is to provide a seal device for a middle broken portion of a multiple shield machine, which solves the above-mentioned problems of the prior art.
上記目的を達成するために本考案は、複数の擬似円形
部と擬似円形部同士を接続する逆円弧部とからなる断面
形状を持つシールド本体を前胴と後胴とに分割し、前胴
の後端部に後胴の縮径された前端部をすきまを持たせて
はめ込み、中折れ部を形成した多連シールド掘進機にお
いて、後胴の前端部外周面に設けたシール収納溝にほぼ
円形の断面形状を持ち張力を与えられた状態で環状に連
続したシール材を前胴の後端部内周面の少なくとも１部
と摺動接触するように収納し、かつ該シール材を少なく
とも前記逆円弧部でシール収納溝内に拘束する手段を設
けたことを特徴とする。In order to achieve the above object, the present invention divides a shield body having a cross-sectional shape consisting of a plurality of pseudo-circular portions and an inverse circular arc portion connecting the pseudo-circular portions into a front body and a rear body, and In a multiple shield excavator in which the rear end is fitted with a reduced front end of the rear body with a gap to form a middle bend, the seal housing groove provided on the outer peripheral surface of the front end of the rear body is approximately circular. A sealing material having a circular cross-sectional shape and being continuously tensioned in an annular shape is housed so as to make sliding contact with at least a part of the inner peripheral surface of the rear end of the front body, and the sealing material is at least the reverse arc. It is characterized in that a part is provided with a means for restraining the seal in the seal receiving groove.
上記構成によると、シールド断面の逆円弧部以外の部
分（擬似円形部）では、シール材は張力により常時シー
ル収納溝の底面に押し付けられており、また逆円弧部で
は、シール材はシール収納溝の底面から離れようとする
動きを拘束されているので、いずれの部分でも中折れ時
にシール材が摺動部分のすきまにはさみ込まれて損傷す
ることを防止できる。According to the above configuration, the seal material is constantly pressed against the bottom surface of the seal accommodating groove by the tension in the portion other than the reverse arc portion of the shield cross section (pseudo-circular portion), and in the reverse arc portion, the seal material is in the seal accommodating groove. Since the movement to move away from the bottom surface of the sealing member is restricted, it is possible to prevent the sealing material from being damaged by being pinched in the clearance of the sliding portion at any portion during the center bending.
第６図〜第８図に本考案を２連シールド掘進機に適用
した例を示す。6 to 8 show an example in which the present invention is applied to a double shield machine.
シールド本体１は２つの擬似円形部1aと隣接する擬似
円形部同士を接続する逆円弧部1bとからなるまゆ形の断
面形状を有し、曲線施工を容易にするため、前胴２と後
胴３とに分割して構成されている。そして、前胴２の後
端部2aに後胴３の縮径された前端部3aをすきまを持たせ
てはめ込み、中折れ部（第６図Ａ部）を形成している。
機内への土砂、地下水の侵入を防止するため、この中折
れ部には後述する中折れ部シール装置が設けられてい
る。The shield body 1 has an eyebrows-shaped cross-sectional shape composed of two pseudo-circular portions 1a and an inverted circular arc portion 1b connecting adjacent pseudo-circular portions, and in order to facilitate curved construction, the front body 2 and the rear body 2 It is divided into three parts. Then, the reduced diameter front end portion 3a of the rear body 3 is fitted into the rear end portion 2a of the front body 2 with a clearance to form a middle bent portion (A portion in FIG. 6).
In order to prevent the intrusion of earth and sand and groundwater into the cabin, this center folding part is provided with a center folding part sealing device described later.
シールド本体１の前面には切羽掘削用のカッタホイル
４が２基装備されており、各々のカッタホイル４は同一
平面内に互いに干渉しないように位相をずらして配置さ
れ、独立したカッタ駆動モータ（図には１個のみ示す）
５により逆方向に同期して回転する。掘削された土砂は
左右に１基づつ装備されたスクリュウコンベア６により
後方に排出される。機内には複数本のシールドジャッキ
７が配置されており、セグメント８を反力受としてシー
ルド掘進機を推進する。また、前胴２と後胴３とはシー
ルドジャッキ７の間に配置された複数本の中折れジャッ
キ９により連結されている。The front face of the shield body 1 is equipped with two cutter wheels 4 for face excavation, and the respective cutter wheels 4 are arranged in the same plane with their phases shifted so as not to interfere with each other, and independent cutter drive motors (see the figure). Indicates only one)
5 rotates in synchronization in the opposite direction. The excavated earth and sand are discharged rearward by the screw conveyors 6 provided one on each side. A plurality of shield jacks 7 are arranged in the machine, and the segment 8 receives the reaction force to propel the shield machine. Further, the front body 2 and the rear body 3 are connected by a plurality of center folding jacks 9 arranged between the shield jacks 7.
曲線施工時には、カッタホイル４に装備された余掘り
用カッタ10により必要量の余掘りをするとともに、曲線
路の内側に位置する中折れジャッキ９のストロークより
曲線路の外側に位置する中折れジャッキ９のストローク
を大きくすることで前胴２と後胴３に相対的に角度を持
たせ、少ない余掘り量で曲線施工が可能なようにしてい
る。At the time of a curved construction, a necessary amount of excess digging is carried out by the digging cutter 10 equipped on the cutter wheel 4, and the middle folding jack 9 located outside the curved road is larger than the stroke of the middle folding jack 9 located inside the curved road. By increasing the stroke, the front body 2 and the rear body 3 are relatively angled so that curved construction can be performed with a small amount of excess digging.
第１図に本考案による中折れ部シール装置の一実施例
を示し、第２図にその中折れ時の状態を示す。FIG. 1 shows an embodiment of a sealing device for a center-bent portion according to the present invention, and FIG. 2 shows a state at the time of the center-bending portion.
多連シールド掘進機の中折れ部シール装置には次のこ
とが要求される。The following are required for the seal device for the broken part of the multiple shield machine.
（ｉ）中折れ時、摺動部分のすきまにシール材がはさみ
込まれないこと。(I) The sealing material should not be caught in the clearance of the sliding part when it is bent in the middle.
（ii）シール材は摺動部分のすきまの変化に対して十分
なたわみ代を持っていること。中折れ時、摺動部分のす
きまが一端側では縮み、他端側では広がること、各部寸
法公差の集積や後胴の自重により前胴と後胴の中心がず
れることなどが原因となり、摺動部分のすきまが大きく
変化するためである。(Ii) The seal material must have a sufficient bending allowance with respect to changes in the clearance of the sliding parts. During center bending, the sliding part's clearance contracts on one end side and widens on the other end side, and the center of the front body and rear body is displaced due to the accumulation of dimensional tolerances of each part and the rear body's own weight. This is because the clearance of the part changes greatly.
（iii）高水圧に耐えること。(Iii) Withstanding high water pressure.
これらの条件を満たすために本実施例では、第１図お
よび第２図に示すように、シール材としてほぼ円形の断
面形状を持つ環状に連続した中空Ｏリング11を採用し、
この中空Ｏリング11を後胴３の前端部3aの外周面に設け
たシール収納溝12に、前胴２の後端部2aの内周面と摺動
接触するように張力を与えた状態で収納している。そし
て、シール収納溝12は、少なくとも後胴３の逆円弧部1b
では溝出口部幅寸法がＯリング外径より小さい、あり溝
形に形成してある。In order to satisfy these conditions, in the present embodiment, as shown in FIGS. 1 and 2, a hollow O-ring 11 having an annular shape and having a substantially circular cross-sectional shape is used as a sealing material.
With this hollow O-ring 11 being tensioned in a seal receiving groove 12 provided on the outer peripheral surface of the front end portion 3a of the rear body 3 so as to make sliding contact with the inner peripheral surface of the rear end portion 2a of the front body 2. It is stored. The seal housing groove 12 is formed at least in the reverse arc portion 1b of the rear body 3.
In, the groove outlet width dimension is smaller than the O-ring outer diameter, and is formed in a dovetail groove shape.
本実施例で採用した中空Ｏリング11は、たわみ代が外
径の数10％程度まで取れ、かつ数10％程度のたわみが生
じた状態でもシール機能を維持できることから、前記
（ii），（iii）の条件を十分満足する。この中空Ｏリ
ング11を張力を与えた状態で溝12に収納することによ
り、後胴３の擬似円形部1aでは、中空Ｏリング11は張力
により溝12の底面に押し付けられているので、中折れ
時、摺動部分のすきまにはさみ込まれる可能性が少な
い。後胴３の逆円弧部1bでは、中空Ｏリング11は張力に
より溝12の底面から離れる方向（第２図のＦ矢印方向）
に動こうとするが、中空Ｏリング11の両側の面があり溝
形に形成された溝12の傾斜面に当り、ある程度以上は溝
外に出ないように動きを拘束されているため、逆円弧部
でも中折れ時、中空Ｏリング11が摺動部分のすきまには
さみ込まれる可能性は少ない。あり溝形としたシール収
納溝12の深さおよび幅寸法は、中空Ｏリング11が溝の傾
斜面に当り変形した状態でも、十分なたわみ代が得られ
るように設定されている。The hollow O-ring 11 used in this embodiment has a bending margin of up to about 10% of the outer diameter, and can maintain the sealing function even when the bending of about 10% occurs. Therefore, the above (ii), ( Satisfy the condition of iii). By storing the hollow O-ring 11 in the groove 12 in a tensioned state, the hollow O-ring 11 is pressed against the bottom surface of the groove 12 by the tension in the pseudo circular portion 1a of the rear body 3, so that the hollow O-ring 11 is bent in the middle. At this time, there is little possibility of being caught in the clearance of the sliding part. In the reverse arc portion 1b of the rear body 3, the hollow O-ring 11 is separated from the bottom surface of the groove 12 by the tension (direction of arrow F in FIG. 2).
However, the hollow O-ring 11 has both surfaces on both sides and hits the inclined surface of the groove 12 formed in a groove shape, and the movement is restricted so as not to go out of the groove beyond a certain degree. The hollow O-ring 11 is unlikely to be caught in the clearance of the sliding portion even when the circular arc is broken. The depth and width of the dovetail-shaped seal accommodating groove 12 are set so that a sufficient bending margin can be obtained even when the hollow O-ring 11 is deformed by hitting the inclined surface of the groove.
中空Ｏリング11は、形状が単純で安価であり、信頼性
も高い。また、シール収納溝12のあり溝加工も比較的容
易で、製作費用が安くてすむ。また、加工されたシール
溝12へシール材の張力を与えられた状態のＯリングを収
納するから、シール材をシール溝全周に均一に収納で
き、シール材をねじ止めするようなシール構造と比較し
て取り付けも良好に容易にできる。また、シール材をね
じ止めするようなシール構造と比較すると、シール部の
幅を小さくできるため、シールド機長が短くてすむし、
シール部の幅が小さければ摺動部分のすきまt1、t2が小
さくなるので、なおさらシール材が摺動部分のすきまに
はさみ込まれる可能性は少なくなる。The hollow O-ring 11 has a simple shape, is inexpensive, and has high reliability. Further, since the seal accommodating groove 12 is provided, the groove processing is relatively easy, and the manufacturing cost is low. Further, since the O-ring in the state where the sealing material is given tension is stored in the processed sealing groove 12, the sealing material can be evenly stored around the entire circumference of the sealing groove, and the sealing structure is such that the sealing material is screwed. In comparison, it can be installed easily and satisfactorily. In addition, compared with a seal structure in which the seal material is screwed, the width of the seal part can be made smaller, so the shield machine length can be shortened,
If the width of the seal portion is small, the clearances t 1 and t 2 of the sliding portion are small, so that the possibility that the seal material is inserted into the clearance of the sliding portion is further reduced.
シール収納溝12のあり溝加工は全周にわたって行って
もよいし、逆円弧部を含む限られた範囲のみあり溝加工
を行い、残りの部分は第５図に示すような通常の平行溝
として加工費の低減を図ることもできる。The dovetail groove of the seal accommodating groove 12 may be formed over the entire circumference, or the dovetail groove may be formed only in a limited area including the reverse circular arc portion, and the remaining portion is formed as a normal parallel groove as shown in FIG. It is also possible to reduce the processing cost.
また、上記実施例ではシール材として中空Ｏリングを
採用したが、中折れ角度が小で、シール材に要求される
たわみ代が小さい場合には、中実のＯリングでもよい。Further, although a hollow O-ring is used as the sealing material in the above-mentioned embodiment, a solid O-ring may be used if the center bending angle is small and the bending allowance required for the sealing material is small.
本考案による中折れ部シール装置の他の実施例を第３
図、第４図に示す。The third embodiment of the middle bent portion sealing device according to the present invention
Shown in FIG.
第３図の実施例では、少なくとも逆円弧部のシール収
納溝を段付溝14とし、シール材としてはつば付の中空Ｏ
リング13を用い、そのつば部13aを段付溝14の段部14aに
掛け止めることにより、つば付中空Ｏリング13が溝14の
底面から離れようとする動きを拘束して、中折れ時、摺
動部分のすきまへのはさみ込みを防止する効果を得てい
る。本実施例は、第１図、第２図の実施例と比較してシ
ール形状はやや複雑になるが、溝内でのシール材の拘束
がより確実に行える長所を持っている。In the embodiment of FIG. 3, at least the seal housing groove of the reverse arc portion is the stepped groove 14, and the seal member is a hollow O with a collar.
By using the ring 13 and suspending the flange portion 13a thereof from the stepped portion 14a of the stepped groove 14, the movement of the hollow O-ring 13 with a collar from leaving the bottom surface of the groove 14 is restricted, and when the center is bent, It has the effect of preventing the sliding part from being caught in the clearance. The present embodiment has a slightly complicated seal shape as compared with the embodiments of FIGS. 1 and 2, but has an advantage that the sealing material can be more securely restrained in the groove.
第４図の実施例は、シール材としてつば付の中空Ｏリ
ング15を用い、逆円弧部のシール収容溝16の底面には適
当な間隔でねじ穴17を設け、つば付中空Ｏリング15のつ
ば部15aをボルト18とシール押さえ19で溝16の底面に押
さえ付けることにより、つば付中空Ｏリング15を溝内に
拘束し、中折れ時、摺動部分のすきまへのはさみ込みを
防止しようとするもので、他の実施例と比較してシール
部の幅は大きくなるが、溝加工が容易であり、溝内での
シール材の拘束も確実に行える長所を持っている。In the embodiment shown in FIG. 4, a hollow O-ring 15 with a collar is used as the sealing material, and screw holes 17 are provided at appropriate intervals on the bottom surface of the seal accommodating groove 16 in the reverse arc portion to form a hollow O-ring 15 with a collar. By pressing the flange portion 15a against the bottom surface of the groove 16 with the bolt 18 and the seal retainer 19, the hollow O-ring 15 with a collar is restrained in the groove, and it is possible to prevent the sliding portion from being caught in the clearance when the center is bent. Therefore, although the width of the seal portion is larger than that of the other embodiments, the groove is easily machined and the sealing material can be reliably restrained in the groove.
本考案を適用する多連シールド掘進機は、シールド断
面の擬似円形部が何個あってもよく、また、その接続方
向が水平、垂直いずれであってもよい。The multiple shield excavator to which the present invention is applied may have any number of pseudo-circular portions of the shield cross section, and the connecting direction may be horizontal or vertical.
本考案によれば、多連シールド掘進機の中折れ部にほ
ぼ円形の断面形状を持つＯリング等のシール材を使用す
る場合、シールド断面の擬似円形部ではシール材を張力
によりシール収納溝の底面に押し付け、シールド断面の
逆円弧部ではシール材が張力によりシール収納溝の底面
から離れようとする動きを拘束しているので、中折れ時
にシール材が摺動部分のすきまにはさみ込まれて切断あ
るいは損傷することを防止できる。これにより、シール
ド掘進機の本体構造の複雑化、機内スペースの縮小、中
折れジャッキの容量、本数の増加などを避け、中折れ部
のシールを長期間確実に行うことができる。According to the present invention, when a sealing material such as an O-ring having a substantially circular cross-sectional shape is used in the middle bent part of the multiple shield machine, the sealing material is tensioned in the pseudo-circular part of the shield cross-section by tension. The seal material is pressed against the bottom surface and restrains the movement of the seal material from leaving the bottom surface of the seal accommodating groove due to tension in the reverse arc portion of the shield cross section. It is possible to prevent cutting or damage. As a result, the structure of the shield machine can be prevented from becoming complicated, the space inside the machine can be reduced, the capacity of the middle-breaking jacks and the number of the middle-breaking jacks can be increased, and the middle-breaking portion can be reliably sealed for a long period of time.
第１図は本考案による中折れ部シール装置の一実施例の
側断面図、第２図は上記実施例の中折れ時の状態を示す
側断面図、第３図、第４図は本考案による中折れ部シー
ル装置の他の実施例を示す側断面図、第５図はＯリング
を用いた中折れ部シール装置の従来例の側断面図、第６
図は本考案を適用した２連シールド掘進機の側断面図、
第７図は第６図のＢ矢視図、第８図は第６図のＣ−Ｃ断
面図である。 １……シールド本体、1a……擬似円形部、1b……逆円弧
部、２……前胴、2a……前胴の後端部、３……後胴、3a
……後胴の前端部、11……中空Ｏリング、12……あり溝
形のシール収納溝、13……つば付中空Ｏリング、14……
段付のシール収納溝、15……つば付中空Ｏリング、16…
…シール収納溝、17……ねじ穴、18……ボルト、19……
シール押さえ。FIG. 1 is a side sectional view of an embodiment of a seal device for a center-bent portion according to the present invention, FIG. 2 is a side sectional view showing a state of the above-described embodiment when the center is folded, and FIGS. 3 and 4 show the present invention. FIG. 6 is a side sectional view showing another embodiment of the middle broken portion sealing device according to the present invention, and FIG. 5 is a side sectional view of a conventional example of the middle broken portion sealing device using an O-ring.
The figure is a side sectional view of a double shield machine with the present invention applied.
FIG. 7 is a view on arrow B in FIG. 6, and FIG. 8 is a sectional view taken along line CC of FIG. 1 ... Shield body, 1a ... Pseudo-circular part, 1b ... Reverse arc part, 2 ... Front body, 2a ... Rear end of front body, 3 ... Rear body, 3a
...... Front end of rear body, 11 ...... Hollow O-ring, 12 …… Dovetail-shaped seal storage groove, 13 …… Hollow O-ring with collar, 14 ……
Stepped seal storage groove, 15 ... Hollow O-ring with collar, 16 ...
… Seal seal groove, 17 …… Screw hole, 18 …… Bolt, 19 ……
Seal holder.
Claims (1)
士を接続する逆円弧部とからなる断面形状を持つシール
ド本体を前胴と後胴とに分割し、前胴の後端部に後胴の
縮径された前端部をすきまをもたせてはめ込み、中折れ
部を形成した多連シールド掘進機において、後胴の前端
部外周面に設けたシール収納溝にほぼ円形の断面形状を
持ち張力を与えられた状態の環状に連続したシール材を
前胴の後端部内周面の少なくとも１部と摺動接触するよ
うに収納し、かつ該シール材を少なくとも前記逆円弧部
でシール収納溝内に拘束する手段を設けたことを特徴と
する多連シールド掘進機の中折れ部シール装置。1. A shield body having a cross-sectional shape consisting of a plurality of pseudo-circular portions and an inverted circular arc portion connecting adjacent pseudo-circular portions is divided into a front body and a rear body, and a shield is provided at a rear end portion of the front body. In a multiple shield excavator that is fitted with a reduced diameter front end of the rear body with a gap to form a center fold, the seal housing groove provided on the outer peripheral surface of the front end of the rear body has a substantially circular cross-sectional shape. A ring-shaped continuous seal material in a tensioned state is accommodated so as to be in sliding contact with at least a part of the inner peripheral surface of the rear end portion of the front body, and the seal material is sealed in at least the reverse arc portion. A device for sealing a middle broken portion of a multiple shield machine, which is provided with a means for restraining the inside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989146980U JPH089272Y2 (en) | 1989-12-22 | 1989-12-22 | Sealing device for middle broken part of multiple shield machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989146980U JPH089272Y2 (en) | 1989-12-22 | 1989-12-22 | Sealing device for middle broken part of multiple shield machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0386193U JPH0386193U (en) | 1991-08-30 |
| JPH089272Y2 true JPH089272Y2 (en) | 1996-03-13 |
Family
ID=31693514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989146980U Expired - Lifetime JPH089272Y2 (en) | 1989-12-22 | 1989-12-22 | Sealing device for middle broken part of multiple shield machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH089272Y2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0320395Y2 (en) * | 1986-11-07 | 1991-05-01 | ||
| JPS63308195A (en) * | 1987-06-08 | 1988-12-15 | 大豊建設株式会社 | Shielding excavating method and shielding machine |
-
1989
- 1989-12-22 JP JP1989146980U patent/JPH089272Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0386193U (en) | 1991-08-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH089272Y2 (en) | Sealing device for middle broken part of multiple shield machine | |
| JP2824216B2 (en) | Overcutting device for hard rock tunnel excavator | |
| KR940000722A (en) | Shield device | |
| JPH036320B2 (en) | ||
| JP3069506B2 (en) | Folding shield excavator | |
| EP0308561B1 (en) | Device for positioning a tunnel lining segment seal | |
| JP3841625B2 (en) | Body structure of expansion and contraction type tunnel excavator | |
| JP3306338B2 (en) | Shield machine | |
| JP2820921B2 (en) | Tail plate structure of shield machine | |
| JP2999133B2 (en) | Tunnel excavator | |
| JP3377655B2 (en) | Cutter spoke structure, tunnel excavator and tunnel excavation method | |
| JP2835852B2 (en) | Shield excavation method | |
| JPH1113391A (en) | Tail seal device and tail seal brush for shield excavating machine | |
| JP2007051433A (en) | Sealing structure between segments and sealing method for segment | |
| JPH07247797A (en) | Circular holder of lining wall for tunnel construction | |
| JPH10252393A (en) | Widening/narrowing segment for tunnel construction | |
| JP3080888B2 (en) | Water-stop structure of entrance part in shield method and water-stop method using the same | |
| JP3288349B2 (en) | Water stop device of shield machine | |
| JP2808519B2 (en) | Multiple tunnel excavator | |
| JPH0419111Y2 (en) | ||
| JP2024005048A (en) | Shield machine | |
| JP4286993B2 (en) | Shield excavator | |
| JPH0626628Y2 (en) | Multiple shield shield machine | |
| JP2001055891A (en) | Cutter bit changing mechanism of shield machine | |
| JP3336097B2 (en) | Shield machine |