H&V means Horizontal variation & Vertical variation. The feature of H&V TBM are; ①independently controlled circular TBMs that are connected each other with flexible joint. ②Each TBM can be disconnected in the ground as needed. ③Cross articulation system allows spiral advancing movement and as a result, the position of each TBM can change from a top and bottom line to right and left line.
T-BOSS method (T-type basement Branch Off Shield System)
It is one of the methods to connect the excavating tunnel to an existing tunnel. It has a built-in steel cylinder driven by cutter head driving power. The steel cylinder has special cutter bits and bore through the existing tunnel wall, either steel segments or reinforced concrete segments. While advancing forward, the tunnel wall of TBM stays close to the exisiting tunnel. The steel cylinder can resist ground pressure and water pressure, so that ground improvement work can be reduced and tunnel connection work can be done more safely and effectively.
Year of delivery / Place of delivery
2022 / Tokyo
Construction name
Higashi Ojima Pipe Line
Owner name
Tokyo Metropolitan Government Bureau of Sewerage
Contractor name
Kumagai Gumi Co., Ltd.
TBM outer diameter
4.19m
Excavation distance
1880m
Features
It makes unnecessary for site workers to work on the cutting face and thus improves safety and construction efficiency.
Inner Shell DSR TBM (Draw a Shield for Recycle system)
The TBM’s external casing and internal unit are constructed as independent units, and the internal (drive) unit is removed following completion of tunneling of the first section. It is taken to the departure shaft, where a new external casing is fitted, and excavation is then begun on the next construction section. Because the TBM’s internal unit is resued, there is no need to construct an arrival shaft. The drive shaft can also be set up anywhere along the construction route.
Year of delivery / Place of delivery
2001 / Tokyo
Construction name
Reconstruction work near Honkomagome 1, 3-chome, Bunkyo-ku
Owner name
Tokyo Metropolitan Government Bureau of Sewerage
Contractor name
Arai / Shiraishi JV
TBM outer diameter
2.68m
Excavation distance
686m
Mother and Child TBM
It has a built-in Child unit TBM that can be separated in the underground. As a result, the Mother unit TBM and Child unit TBM can excavate tunnels of different size. Various methods can be applied to the cutter head separation technology, depending on the conditions such as the type, size, and diameter difference of cutter head between the Mother unit and Child unit.
Year of delivery / Place of delivery
2005 / Tokyo
Construction name
Line 13 South Ikebukuro Line A Construction
Owner name
Tokyo Metro Co., Ltd.
Contractor name
Obayashi / Toa / Dai Nippon JV
TBM outer diameter
8.17m / 6.78m
Excavation distance
132m / 1,454m
Eccentric multi-axis TBM (DPLEX TBM)
It is a method of excavation by driving multiple parallel links that support the cutter head. By changing the cutter head to a shape other than a circle, various cross-section excavations are possible.
Year of delivery / Place of delivery
1999 / Hyogo
Construction name
Kanaoka Stormwater Storage Pipe Line
Owner name
Itami City
Contractor name
Shimizu / Kumagai / Maeda JV
TBM outer diameter
7.67m
Excavation distance
1,150m
Year of delivery / Place of delivery
2002 / Osaka
Construction name
Doigawa Stormwater Line Sewage Pipe Line (No. 2)
Owner name
Sakai City Construction Bureau Sewerage Department
Contractor name
Obayashi / Daiho / Sakai Doken JV
TBM outer diameter
3.93ｍ / 2.14ｍ
Excavation distance
1,777m
Features
Mother and Child TBM, DPLEX TBM
Multi-Face TBM (MF TBM)
The MF TBM has multiple cutter heads overlapping each other, and excavate several kinds of sections, wind or tall oblong cross sections. It can be used effectively in limited areas or spaces in underground structures. It can supply effective tunnel sections to meet construction conditions and tunnel purposes.
Year of delivery / Place of delivery
2000 / Tokyo
Construction name
Kiyosumi Construction Area on Subway Line 11
Owner name
Teito Rapid Transit Authority
Contractor name
Kumagai / Maeda / Mitsui JV
TBM outer diameter
7.44m / 16.44m
Excavation distance
373m
MSD TBM (Mechanical Shield Docking TBM)
Two TBMs coming from opposite directions meet each other under the ground. One TBM has a steel cylinder pushing forward to the other machine. Another TBM has rubber ring jointing with the cylinder. The steel cylinder and rubber ring can shut off soil and ground water completely. After docking, the equipment and structure inside the two machines are removed, then tunnels are jointed.
Jointing method
Joint details
Year of delivery / Place of delivery
2010 / Tokyo
Construction name
Water pipe (1500 mm) between 2781 Aiharamachi and 706 Aiharamachi, Machida City
Owner name
Tokyo Metropolitan Government Bureau of Waterworks
Contractor name
Shimizu / Fudo Tetra Construction JV
TBM outer diameter
2.59ｍ
Excavation distance
1,538m
Features
It is an economical method that does not require an auxiliary construction method to strengthen the shaft or ground.
TBM for steep inclines
It is a TBM dedicated to steep slopes that excavates tunnels with a slope of more than 30% diagonally upward. In order to excavate steep slopes, a large gripper and anti-slip steel or invert block are supported by shield jacks to prevent the machine from slipping. 3 of 4 past constructions in Japan are manufactured by us.
Year of delivery / Place of delivery
2002 / Miyazaki Prefecture
Construction name
Komarugawa Power Plant Hydraulic Pipeline Inclined Shaft
Owner name
Kyushu Electric Power Co., Inc.
Contractor name
Okumura / Sato / Daiho / Asanuma JV
TBM outer diameter
2.7m
Excavation distance
1,780m
Vertical TBM
It is a TBM that vertically excavates the ground including rocks of deep underground. In addition to various seals that support high water pressure, the soil discharge system is divided into two line to reduce water pressure during excavation, achieving stable excavation.
Year of delivery / Place of delivery
2006 / Okayama Prefecture
Construction name
Kurashiki Base Propane Storage Tank I Construction (Water Supply / Ventilation Shaft)
Owner name
Japan Oil, Gas and Metals National Corporation (JOGMEC)
Contractor name
Shimizu / Hazama / Okumura JV
TBM outer diameter
4.76m
Excavation distance
146m
Automatic underwater excavation machine
The automatic underwater excavation machine has a built-in excavation pattern that automatically excavates the base plate directly on the cutting edge so that the caisson can be smoothly submerged in a wide range of ground conditions.
