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1. 发明专利

JP2007077735A Tunnel excavator 有权
标题翻译：隧道挖掘机
公开(公告)号：JP2007077735A
公开(公告)日：2007-03-29
申请号：JP2005269531
申请日：2005-09-16
申请人： Kajima Corp , Kawasaki Heavy Ind Ltd , Mitsubishi Heavy Ind Ltd , 三菱重工業株式会社 , 川崎重工業株式会社 , 鹿島建設株式会社
发明人： AZUMA TAKASHI , SUGIYAMA MASAHIKO , FURUI MICHIO , NAGAMORI KUNIHIRO , SHIRAI SHUNSUKE , KAMIO MASAHIRO
IPC分类号： E21D11/00 , E21D9/06
摘要： PROBLEM TO BE SOLVED: To provide a tunnel excavator equipped with a tail seal device which has tail seal brushes arranged in multiple stages to cope with high water pressure cutoff, has air tubes arranged at respective tail seal brush sliding portions, to thereby improve adhesiveness of the sliding portions and exert sufficient sealing performance. SOLUTION: According to the structure of the tunnel excavator, the tail seal device which slides on an outer surface of a main line segment S1 corresponding to a fixed shell, and an outer surface of a widened segment S2 corresponding to a movable shell, is formed of: band-shaped first tail seal brushes 33a to 33d set on an inner surface of the fixed shell in multiple stages along a longitudinal direction; band-shaped second tail seal brushes 34a to 34d set on an inner surface of the movable shell in multiple stages at locations where the first tail seal brushes are slidable; and first air tubes 35a to 35d arranged at mounting portions of the first and second tail seal brushes, for energizing the tips of the first and second tail seal brushes toward the outer surfaces of the main line segment and the widened segment. COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：为了提供一种具有尾部密封装置的隧道式挖掘机，该尾部密封装置具有多级布置以应对高水压截止的尾部密封刷，具有布置在各个尾部密封刷滑动部分处的空气管，从而提高滑动部的粘合性，发挥充分的密封性。解决方案：根据隧道挖掘机的结构，在对应于固定壳体的主线段S1的外表面上滑动的尾密封装置和对应于可移动壳体的加宽段S2的外表面由沿着长度方向多级设置在固定壳体的内表面上的带状的第一尾部密封刷33a〜33d形成，在第一尾部密封刷可滑动的位置处，多个阶段设置在可动壳的内表面上的带状第二尾部密封刷34a至34d; 以及布置在第一和第二尾部密封刷的安装部分处的第一空气管35a至35d，用于将第一和第二尾部密封刷的尖端向主线段和加宽段的外表面供能。版权所有（C）2007，JPO＆INPIT

2. 发明专利

JP2007077737A Tunnel excavator 有权
标题翻译：隧道挖掘机
公开(公告)号：JP2007077737A
公开(公告)日：2007-03-29
申请号：JP2005269533
申请日：2005-09-16
申请人： Kajima Corp , Kawasaki Heavy Ind Ltd , Mitsubishi Heavy Ind Ltd , 三菱重工業株式会社 , 川崎重工業株式会社 , 鹿島建設株式会社
发明人： AZUMA TAKASHI , SUGIYAMA MASAHIKO , FURUI MICHIO , NAGAMORI KUNIHIRO , SHIRAI SHUNSUKE , KAMIO MASAHIRO
IPC分类号： E21D9/06 , E21D11/00
摘要： PROBLEM TO BE SOLVED: To provide a tunnel excavator equipped with a tail seal device which can sufficiently cope with high water pressure cutoff, and effectively forms a cutoff system without increasing the length of the excavator. SOLUTION: The slurry shield machine is equipped with the tail seal device 26 which is mounted on a rear end of a fixed shell 2 and a movable shell 3 of an excavator main body 1, and has brush tips sliding on an outer surface of a main line segment S1 corresponding to the fixed shell and an outer surface of an widened segment S2 corresponding to the movable shell. The tail seal device is formed of: band-shaped first tail seal brushes 33a to 33d set on an inner surface of the fixed shell in multiple stages along a longitudinal direction; and band-shaped second tail seal brushes 34a to 34d set on an inner surface of the movable shell in multiple stages along the longitudinal direction. Then a first end face seal brush 37 connecting between ends of the first tail seal brushes in the multiple stages, and a second end face seal brush 38 connecting between ends of the second tail seal brushes in the multiple stages, are slid on each other via side surfaces of wire brushes in a tunnel radial direction. COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：提供一种配备有可以充分应对高水压截止的尾部密封装置的隧道挖掘机，并且有效地形成切割系统而不增加挖掘机的长度。
解决方案：浆料屏蔽机配备有安装在挖掘机主体1的固定壳体2的后端和可动壳体3的后端的尾部密封装置26，并且具有在外表面上滑动的刷头对应于固定壳体的主线段S1和对应于可动壳体的加宽段S2的外表面。尾部密封装置由沿着长度方向设置在固定壳体的内表面上的多个级的带状的第一尾部密封刷33a至33d形成; 以及沿着长度方向设置在可动壳的内表面上的多个级的带状的第二尾密封刷34a至34d。然后在多级中连接第一尾密封刷的端部之间的第一端面密封刷37和连接在多级中的第二尾密封刷的端部之间的第二端面密封刷38彼此通过钢丝刷在隧道径向方向的侧面。版权所有（C）2007，JPO＆INPIT

3. 发明专利

JP2007077736A Tunnel excavator 有权
标题翻译：隧道挖掘机
公开(公告)号：JP2007077736A
公开(公告)日：2007-03-29
申请号：JP2005269532
申请日：2005-09-16
申请人： Kajima Corp , Kawasaki Heavy Ind Ltd , Mitsubishi Heavy Ind Ltd , 三菱重工業株式会社 , 川崎重工業株式会社 , 鹿島建設株式会社
发明人： AZUMA TAKASHI , SUGIYAMA MASAHIKO , FURUI MICHIO , NAGAMORI KUNIHIRO , SHIRAI SHUNSUKE , KAMIO MASAHIRO
IPC分类号： E21D11/40
摘要： PROBLEM TO BE SOLVED: To provide a tunnel excavator equipped with an erector device which has a sufficient degree of freedom, and facilitates assembly of special-shaped segments such as D-shaped ones, for instance. SOLUTION: The tunnel excavator is formed of a cylindrical excavator main body 1, a shield jack 22 for advancing the excavator main body, a cutter head 10 rotatably supported on a front portion of the excavator main body, a driving motor 13 for driving the cutter head for rotation, and the erector device 24 for assembling the segment S in a tail of the excavator main body. The erector device has a grip device 36 which is rotatable with respect to the excavator main body at least about a first rotation axis A extending in a tunnel excavation direction, and a second rotation axis B deviated from the first rotation axis in a tunnel radial direction. COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：提供一种配备有具有足够自由度的竖立装置的隧道挖掘机，并且便于组装诸如D形的特殊部分。解决方案：隧道式挖掘机由圆柱形挖掘机主体1，用于推进挖掘机主体的屏蔽插座22，可旋转地支撑在挖掘机主体前部的切割头10，用于驱动刀头旋转，以及用于将段S组装在挖掘机主体的尾部中的竖立装置24。竖立装置具有握持装置36，其可相对于挖掘机主体至少绕隧道挖掘方向延伸的第一旋转轴线A和沿隧道径向方向从第一旋转轴线偏离的第二旋转轴线B旋转。版权所有（C）2007，JPO＆INPIT

4. 发明专利

JP2007247214A Tunnel boring machine 有权
标题翻译：隧道镗床
公开(公告)号：JP2007247214A
公开(公告)日：2007-09-27
申请号：JP2006070368
申请日：2006-03-15
申请人： Kajima Corp , Kawasaki Heavy Ind Ltd , Mitsubishi Heavy Industries Tunneling Machinery & Geotechnology Co Ltd , 三菱重工地中建機株式会社 , 川崎重工業株式会社 , 鹿島建設株式会社
发明人： AZUMA TAKASHI , SUGIYAMA MASAHIKO , FURUI MICHIO , NAGAMORI KUNIHIRO , SHIRAI SHUNSUKE , KAMIO MASAHIRO , TAKIMOTO KUNIHIKO , IGARASHI HIROMASA , UCHIDA HIROSHIGE , IWATA HIROKICHI , SAKAI YOSHIO
IPC分类号： E21D9/06
摘要： PROBLEM TO BE SOLVED: To provide a tunnel boring machine capable of easily increasing the width of a width increasing segment by temporarily relieving a reaction applied to the segment. SOLUTION: This tunnel boring machine comprises an extension base 1 extending to the rear of a boring machine body, a segment width increasing device 6 supported on the extension base 1 movably in the longitudinal excavating direction and increasing the width of the segment S2 for width increasing, shape retaining devices 2, 3 installed in pairs at the front of the segment width increasing device 6 in the excavating direction and supported on the extension base 1 movably in the longitudinal excavating direction, and shape retaining devices 4, 5 installed in pairs at the front and rear of the segment width increasing device 6 in the excavating direction and supported on the extension base 1 movably in the longitudinal excavating direction. COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：提供一种能够通过暂时缓解施加到该段的反应而容易地增加宽度增加段的宽度的隧道掘进机。解决方案：该隧道掘进机包括延伸到镗床主体后部的延伸基座1，沿纵向挖掘方向可移动地支撑在延伸基座1上的分段宽度增加装置6，并增加段S2的宽度对于宽度增加，形状保持装置2,3成对地安装在分段宽度增大装置6的前方，在挖掘方向上并且沿纵向挖掘方向可移动地支撑在延伸基座1上，并且形状保持装置4,5安装在在分段宽度增大装置6的前后沿挖掘方向成对配置，并且沿纵向挖掘方向可移动地支撑在延伸基座1上。版权所有（C）2007，JPO＆INPIT

5. 发明专利

JP2007247211A Construction method for variable cross section of tunnel, and tunnel boring machine for use in it 有权
标题翻译：隧道可变交叉段施工方法及隧道掘进机
公开(公告)号：JP2007247211A
公开(公告)日：2007-09-27
申请号：JP2006070365
申请日：2006-03-15
申请人： Kajima Corp , Kawasaki Heavy Ind Ltd , Mitsubishi Heavy Industries Tunneling Machinery & Geotechnology Co Ltd , 三菱重工地中建機株式会社 , 川崎重工業株式会社 , 鹿島建設株式会社
发明人： AZUMA TAKASHI , SUGIYAMA MASAHIKO , FURUI MICHIO , NAGAMORI KUNIHIRO , SHIRAI SHUNSUKE , KAMIO MASAHIRO , TAKIMOTO KUNIHIKO , IGARASHI HIROMASA , UCHIDA HIROSHIGE , IWATA HIROKICHI , SAKAI YOSHIO
IPC分类号： E21D9/06
摘要： PROBLEM TO BE SOLVED: To enable an easy change such as the width reduction of a part of a cross section of a tunnel.
SOLUTION: This construction method comprises: a step of assembling a D-type bulkhead segment S3 in such a manner that the bulkhead segment S3 continues into an existing circular segment S1; a step of installing an impervious bulkhead ring 2, the inner periphery of which is equipped with a tail sealing device 8, in such a manner that the bulkhead ring 2 continues into the bulkhead segment S3; a step of assembling a D-type segment S2 in the impervious ring in such a manner that the D-type segment S2 continues into the existing bulkhead segment S3; a step of connecting the impervious bulkhead ring to a boring machine body; a step of sequentially assembling the D-type segment S2; a step of disconnecting the impervious bulkhead ring from the boring machine body, while connecting the impervious bulkhead ring to the final D-type segment 2 when the boring machine body reaches a final position where the width of the cross section of the tunnel is reduced; a step of assembling the circular segment S1 in such a manner that the circular segment S1 continues into the impervious bulkhead unit and the final D-type segment S2; and a step of connecting the circular segment S1 to the impervious bulkhead ring and the final D-type segment S2.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：为了实现容易的改变，例如隧道的横截面的一部分的宽度减小。解决方案：该构造方法包括：以隔板段S3继续成为现有的圆形段S1的方式组装D型隔板段S3的步骤; 安装不透水隔板环2的步骤，其内周装备有尾密封装置8，使得隔板环2继续进入隔板段S3; 以D型分段S2连续进入现有的隔板段S3的方式将D型段S2组装在不透水环中的步骤; 将不透水隔板环连接到镗孔机体的步骤; 顺序组装D型段S2的步骤; 当镗床机体到达隧道横截面的宽度减小的最终位置时，将不透水舱壁与镗床主体断开的步骤，同时将不透水舱壁环连接到最终的D型段2; 以圆形段S1连续进入不透水舱壁单元和最终D型段S2的方式组装圆形段S1的步骤; 以及将圆形段S1连接到不透水舱壁环和最终D型段S2的步骤。版权所有（C）2007，JPO＆INPIT

6. 发明专利

JP2007247212A Tunnel boring machine 有权
标题翻译：隧道镗床
公开(公告)号：JP2007247212A
公开(公告)日：2007-09-27
申请号：JP2006070366
申请日：2006-03-15
申请人： Kajima Corp , Kawasaki Heavy Ind Ltd , Mitsubishi Heavy Industries Tunneling Machinery & Geotechnology Co Ltd , 三菱重工地中建機株式会社 , 川崎重工業株式会社 , 鹿島建設株式会社
发明人： AZUMA TAKASHI , SUGIYAMA MASAHIKO , FURUI MICHIO , NAGAMORI KUNIHIRO , SHIRAI SHUNSUKE , KAMIO MASAHIRO , TAKIMOTO KUNIHIKO , IGARASHI HIROMASA , UCHIDA HIROSHIGE , IWATA HIROKICHI , SAKAI YOSHIO
IPC分类号： E21D11/00 , E21D9/06
摘要： PROBLEM TO BE SOLVED: To provide a tunnel boring machine which is equipped with a tail sealing device enabling the sure performance of high-water-pressure cut-off operations and safe boring. SOLUTION: A slurry type shield machine is equipped with the tail sealing device 26 which is mounted in the rear of the fixed outer shell 2 and movable outer shell 3 of a shield machine body 1, so as to seal a section between itself and the outer surface of an existing segment S. The tail sealing device comprises: first strip-shaped tail sealing brushes 33a-33e which are installed over a plurality of longitudinal steps on the inner surface of the fixed outer shell; second strip-shaped tail sealing brushes 34a-34e which are installed over a plurality of longitudinal steps on the inner surface of the movable outer shell, so as to apply sealing in such a manner that their ends adjoin or overlap ends of the first tail sealing brushes, during ordinary boring; a widening steel shell 40 which applies sealing by expanding first and second tube seals 45 and 46 in place of the first and second tail sealing brushes during widening; and widening-section tail sealing brushes 54a-54c which applies sealing by filling a gap between the first and second tail sealing brushes in place of the widening steel shell during widening boring. COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：提供一种隧道掘进机，其配备有能够确保高水压切断操作和安全钻孔的可靠性的尾部密封装置。
解决方案：浆液式屏蔽机器配备有尾部密封装置26，尾部密封装置26安装在屏蔽机体1的固定外壳2和可移动外壳3的后部，以便密封其自身之间的部分和现有节段S的外表面。尾部密封装置包括：第一带状尾部密封刷33a-33e，其安装在固定外壳的内表面上的多个纵向台阶上; 第二带状尾部密封刷34a-34e，其安装在可移动外壳的内表面上的多个纵向台阶上，以便以这样的方式施加密封，使得它们的端部邻接或重叠第一尾部密封件的端部普通无聊时刷子; 加宽钢壳40，其通过在加宽期间扩大第一和第二管密封件45和46而不是第一和第二尾部密封刷来施加密封; 以及加宽型尾部密封刷54a-54c，其通过在加宽钻孔期间填充第一和第二尾部密封刷之间的间隙来代替加宽的钢壳来施加密封。版权所有（C）2007，JPO＆INPIT

7. 发明专利

JP2007247213A Tunnel boring machine 审中-公开
标题翻译：隧道镗床
公开(公告)号：JP2007247213A
公开(公告)日：2007-09-27
申请号：JP2006070367
申请日：2006-03-15
申请人： Kajima Corp , Kawasaki Heavy Ind Ltd , Mitsubishi Heavy Industries Tunneling Machinery & Geotechnology Co Ltd , 三菱重工地中建機株式会社 , 川崎重工業株式会社 , 鹿島建設株式会社
发明人： AZUMA TAKASHI , SUGIYAMA MASAHIKO , FURUI MICHIO , NAGAMORI KUNIHIRO , SHIRAI SHUNSUKE , KAMIO MASAHIRO , TAKIMOTO KUNIHIKO , IGARASHI HIROMASA , UCHIDA HIROSHIGE , IWATA HIROKICHI , SAKAI YOSHIO
IPC分类号： E21D9/06
摘要： PROBLEM TO BE SOLVED: To provide a tunnel boring machine capable of easily boring a wide tunnel by preventing a natural ground from collapsing.
SOLUTION: A forward ground is so excavated that the cross section of the width thereof to be excavated is increased by projecting a copy cutter 3 from the outer peripheral part of a cutter head 2 to the outside and recessing it and swinging the cutter head 2 in the width increasing direction while drivingly rotating the cutter head 2 attached to the front of a skin plate 1. A movable body part 10 is so projected in the width increasing direction that sediment excavated according to the increased width amount can be taken into a chamber 9. A hood 11 is projected in the width increasing direction according to the increased width amount.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：提供一种能够通过防止自然地面塌陷而容易地钻孔宽隧道的隧道掘进机。解决方案：通过将复制切割器3从切割头2的外周部分突出到外部并使其切割并摆动，从而增加了要挖出的宽度的横截面，头部2在宽度增加方向上，同时驱动旋转附接到皮肤板1的前部的切割头2.可移动体部分10以宽度增加方向突出，从而可以将根据增加的宽度量挖掘出的沉积物腔室9.根据增加的宽度量，罩子11沿宽度增加方向突出。版权所有（C）2007，JPO＆INPIT

8. 发明专利

JP2007247210A Construction method for variable cross section of tunnel, and tunnel boring machine for use in it 有权
标题翻译：隧道可变交叉段施工方法及隧道掘进机
公开(公告)号：JP2007247210A
公开(公告)日：2007-09-27
申请号：JP2006070364
申请日：2006-03-15
申请人： Kajima Corp , Kawasaki Heavy Ind Ltd , Mitsubishi Heavy Industries Tunneling Machinery & Geotechnology Co Ltd , 三菱重工地中建機株式会社 , 川崎重工業株式会社 , 鹿島建設株式会社
发明人： AZUMA TAKASHI , SUGIYAMA MASAHIKO , FURUI MICHIO , NAGAMORI KUNIHIRO , SHIRAI SHUNSUKE , KAMIO MASAHIRO , TAKIMOTO KUNIHIKO , IGARASHI HIROMASA , UCHIDA HIROSHIGE , IWATA HIROKICHI , SAKAI YOSHIO
IPC分类号： E21D9/06
摘要： PROBLEM TO BE SOLVED: To enable an easy change such as the width reduction of a part of a cross section of a tunnel.
SOLUTION: This construction method comprises: a step of assembling a D-type bulkhead segment S3 in such a manner that the bulkhead segment S3 continues into an existing circular segment S1; a step of installing impervious bulkhead units 2 and 3 in such a manner that the bulkhead units 2 and 3 continue into the bulkhead segment S3; a step of mounting tail sealing devices 8, 12 and 13 to the side of a back end of a boring machine body; a step of assembling a D-type segment S2 in the impervious bulkhead unit; a step of connecting the impervious bulkhead unit to the boring machine body; a step of sequentially assembling the D-type segment S2; a step of disconnecting the impervious bulkhead unit from the boring machine body, while connecting the impervious bulkhead unit to the final D-type segment 2 when the boring machine body reaches a final position where the width of the cross section of the tunnel is reduced; a step of assembling the circular segment S1 in such a manner that the circular segment S1 continues into the impervious bulkhead unit and the final D-type segment S2; and a step of connecting the circular segment S1 to the impervious bulkhead unit and the final D-type segment S2.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：为了实现容易的改变，例如隧道的横截面的一部分的宽度减小。解决方案：该构造方法包括：以隔板段S3继续成为现有的圆形段S1的方式组装D型隔板段S3的步骤; 安装不透水舱壁单元2和3的步骤，使舱壁单元2和3继续进入舱壁段S3; 将尾部密封装置8,12,13安装到镗孔机体的后端侧的步骤; 在不透水隔板单元中组装D型段S2的步骤; 将不透水隔板单元连接到镗床主体的步骤; 顺序组装D型段S2的步骤; 当镗孔机体到达隧道横截面的宽度减小的最终位置时，将不透水隔板单元与镗床主体断开的步骤，同时将不透水舱壁单元连接到最终D型段2; 以圆形段S1连续进入不透水舱壁单元和最终D型段S2的方式组装圆形段S1的步骤; 以及将圆形段S1连接到不可渗透舱壁单元和最终D型段S2的步骤。版权所有（C）2007，JPO＆INPIT

9. 发明专利

JP2005023686A Tunnel excavator 审中-公开
标题翻译：隧道挖掘机
公开(公告)号：JP2005023686A
公开(公告)日：2005-01-27
申请号：JP2003191731
申请日：2003-07-04
申请人： Mitsubishi Heavy Ind Ltd , 三菱重工業株式会社
发明人： FURUI MICHIO
IPC分类号： E21D9/087
摘要： PROBLEM TO BE SOLVED: To provide a tunnel excavator capable of easily digging tunnels having different shape and cross section and discharging soil stably by improving fluidity of dug sediment in a chamber to improve work efficiency of tunnel excavation work. SOLUTION: A cutter 18 composed of groups 15 to 17 of cutters is mounted in a front part of an excavator main body 11, and a first cutter head 19 and a second cutter head 20 of the first group 15 of cutters are arranged adjacent to each other within the same face to rotate in synchronization in the reverse direction. A third cutter head 21 and a fourth cutter head 22 of the second group 16 of cutters are arranged adjacent to each other within the same face to rotate in synchronization in the reverse direction. A fifth cutter head 23 and a sixth cutter head 24 are arranged by deviating behind from the first and second cutter heads 19, 20, are arranged adjacent to each other within the same face to rotate in synchronization in the reverse direction, and are arranged at the same positions in the direction of digging as the first and second cutter heads 19, 20. Stirring blades 71 to 76 are fixed to rear parts of each cutter head 19 to 24. COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种能够容易地挖掘具有不同形状和横截面的隧道的隧道挖掘机，并且通过提高室内的沉积物的流动性来稳定地排放土壤，以提高隧道掘进工作的工作效率。解决方案：在挖掘机主体11的前部安装有由刀具组15至17组成的刀具18，并且第一组15刀具的第一刀头19和第二刀头20布置在相同的面内彼此相邻地在相反的方向上同步旋转。第二组16刀具的第三刀头21和第四刀头22在相同的面内彼此相邻地布置，以沿相反的方向同步旋转。通过从第一和第二刀头19,20偏离的方式布置第五刀头23和第六刀头24，在相同的面内彼此相邻布置，以沿相反方向同步旋转，并且布置在与第一和第二刀头19,20的挖掘方向相同的位置。搅拌叶片71至76固定到每个切割头19至24的后部。（C）2005年，JPO和NCIPI

10. 发明专利

JP2002021485A TUNNEL EXCAVATOR 失效
公开(公告)号：JP2002021485A
公开(公告)日：2002-01-23
申请号：JP2000200698
申请日：2000-07-03
申请人： MITSUBISHI HEAVY IND LTD , KAJIMA CORP
发明人： SUGIYAMA MASAHIKO , AZUMA TAKASHI , SASAKI YUKINOBU , IGARASHI HIROMASA , MITSUI TAKASHI , TAMAI TATSURO , UCHIYAMA YOSHIHIRO , FURUI MICHIO
IPC分类号： E21D9/087 , E21D9/08 , E21D11/00
摘要： PROBLEM TO BE SOLVED: To improve the waterproofing ability by definitely preventing water immersion to the inner portion of the excavator main body even during the widening of the width in the tunnel excavator. SOLUTION: A main cutter mechanism 12 is installed to the front end portion of the main body 11 of the main excavator, a sub-excavator main bodies 13 and 14 are installed to the sides of the main body 11 of the main excavator in a freely movable manner by using width-widening jacks 17 and 18, sub-cutter mechanisms 16 and 16 are installed to their front end portions, each of the excavator main bodies 11, 13 and 14 are made advancing forward by shield jacks 19, 20 and 21, a main tail seal 31 is installed to the rear portion of the main body 11 of the main excavator, sub-tail seals 32 and 33 are installed to the rear portions of the sub-excavator main bodies 13 and 14, and a second seal portion 31b slidingly contacted to the sub-tail seals 32 and 33 are provided in adjacent to the first seal portion 31a of the main tail seal 31.

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