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We also manufacture cast-in-place piling machine.
JET-18 Method
Utilization of a new light weight and compact machine to be activated under ultra-low headroom at restricted space such as railway platform.
JET-18 Method enables to shorten construction period and decrease the cost since continuous work is possible at the restricted working spaces such as under-platform of railway station, under-bridge or inside the building.
This technology is developed in association with East Japan Railway Company, Tekken Corporation and Toa-Tone Boring Co., Ltd.
Features
Operation under super low headroom
The machine with 1.8 m height (1.0 m rod handling) can be operated smoothly under super low headroom.
Drilling large hole diameter
Despite its compactness, the machine can drill with the diameter upto max. 3.0 m.
Smooth mobilization in restricted space
Since the machine is very compact and has the weight of approx. 4 ton, mobilization of the machine is smooth and the provision of temporary enclosure and scaffold can be relieved.
Adoption of rotary table system differd from conventional system
Rotary table system enables the operation under super low headroom.
Use of reverse circulation system
Reverse circulation system has a high reliability to obtain enough bearing capacity for structural objects.
| JET-18 （Usable at Super Low Headroom） |
||||
|---|---|---|---|---|
| Pile Diameter（mm） | Drilling Depth（m） | Applicable Machine | ||
| Height（mm） | Width（mm） | Length（mm） | ||
| 800～3000 | 100 | 1800 | 2052 | 2950 |
DHB Method
Utilization of drill enabling drilling work at elevated place and securing the safety at ground surface.
"DHB(Down the Hole Bit)" method enables to shorten construction period and decrease the cost since continuous work is possible at the restricted working spaces such as under railway, under bridge, compared with "TBH" method.
This technology is developed in association with East Japan Railway Company and Toa-Tone Boring Co., Ltd.
Features
High efficiency of drilling work from elevated place
By installing submersible sand pump inside bit body, pumping head (elevation that pump can push up the fluid) is increased. Thus, drilling work can be carried out in job sites wherever drilling work from elevated place is required.
Improvement of working safety on the ground
Since submersible sand pump is installed inside bit body, suction pump is not required so that working safety on the ground is improved.
Installation of boulder crushing mechanism
Boulder crushing mechanism located at reverse inlet ensures efficient excavation by preventing the choking in reverse line.
Choice of base machine meeting job site condition
Two types of base machine, skid mounted or crawler mounted, can be selected according to job site condition.
Use of reverse circulation system
Reverse circulation system has a high reliability to obtain enough bearing capacity for structural objects.
| DHB | ||
|---|---|---|
| Pile Diameter（mm） | Drilling Depth（m） | Applicable Machine（Base Machine） |
| 1200～2500 | 100 |
１）Skid Type TBH、JET-18
２）Crawler Type MPD |
TBH Method
Utilization of drill applying reverse circulation system.
Compared with BH method utilizing direct circulation system and spindle type mechanism, TBH method has an advantage for larger diameter drilling to construct parmanent pile.
Features
Adoption of reverse circulation system
Because of the prompt removal of cuttings from hole bottom, revesre circulatino system can obtain a proper bearing capacity for structural object and enables the operation under low noise and low vibration for environmental conservation to the neighboring.
Drilling for harder layer
By means of trocho bit, efficient drilling for gravel layer and harder layer can be displayed.
Compactness suitable for working at restricted space
The use of compact and light weight drill actualizes the smooth operation at restricted space.
Drilling larger hole diameter
Despite its compactness, the machine can drill with the diameter upto max. 2.0 m.
| TBH | |||||
|---|---|---|---|---|---|
| Pile Diameter（mm） | Drilling Depth(m) | Applicable Machine（Base Machine） | |||
| Model Name | Height（mm） | Width（mm） | Length（mm） | ||
| 600～2000 | 70 | TBH-8 | 4385 | 2200 | 4280 |
| TBH-15 | 6341 | 1722 | 4250 | ||
MPD-TBH Method
Utilization of drill with telescopic type extendable leader to enable smooth drilling under low headroom space.
Features
Drill suitable for operation under low headroom
Drill with telescopic type leader enables the smooth operation under low headroom.
High drilling efficiency
Hydraulic top drive mechanism ensures high working efficiency.
High mobility at restricted space
Compact and self-propelled type base machine improves its mobility.
Adoption of reverse circulation system
Because of the prompt removal of cuttings from hole bottom, revesre circulatino system can obtain a proper bearing capacity for structural object and enables the operation under low noise and low vibration for environmental conservation to the neighboring.
Drilling for harder layer
By means of trocho bit, efficient drilling for gravel layer and harder layer can be displayed.
Drilling larger hole diameter
Despite its compactness, the machine can drill with the diameter upto max. 2.0 m.
| MPD-TBH | |||||
|---|---|---|---|---|---|
| Pile Diameter（mm） | Drilling Depth(m) | Applicable Machine（Base Machine） | |||
| Model Name | Height（mm） | Width（mm） | Length（mm） | ||
| 600～2000 | 70 | MPD-25 | 3210 | 2200 | 5500 |
| MPD-45 | 3875 | 2490 | 6350 | ||
BH Method
Utilization of spindle type drill applying direct circulation system
Drilling is continued by circulating stabilizing solution from drilling pump to wing bit and cuttings removed by returning flow of circulation fluid to ground surface are pumped up by submersible sand pump and filtered circulation fluid is re-circulated specified as direct circulation system.
Features
Use of direct circulation system
Mud plant of direct circulation system is more simple than that of reverse circulation system. However, there is still a problem for the smooth removal of cuttings along with circulation fluid and the cleaning of cuttings on hole bottom.
Drilling for rocky formation
Drilling for rocky formation is possible by means of tricone bit.
Compactness suitable for operation at restricted space
The drill is the most compact among the drills to be used for cast-in-place pile construction.
This feature enables the operation at very restricted space and makes transportation and setting up of the drill easier.
Application to various piling works
This method can be applied to pilings with steel pipes, H-beams, multi-column, inclined angle, etc.
| TBM | |||||
|---|---|---|---|---|---|
| Pile Diameter（mm） | Drilling Depth(m) | Applicable Machine（Base Machine） | |||
| Model Name | Height（mm） | Width（mm） | Length（mm） | ||
| 200～1500 | 50 | TBM-88 | 1965 | 1100 | 2290 |
| TBM-88LH | 1760 | 1100 | 2840 | ||
| TBM-88LH150 | 1760 | 1100 | 2840 | ||
Rotary Casing Method
Utilization of rotary casing jacking machine to install the casing for full length of the hole.
After completion of excavation, hole bottom is cleaned and ready mixed concrete is placed into the hole through tremmie pipes after installing reinforced steel cages.
Features
High drilling efficiency disregarding type of ground formation
Efficient drilling through existing reinforced concrete piles or pine piles is possible as well as drilling through gravel layer and rocky formation.
Stability of neighboring ground formation
Drilling with the use of casings keeps the effect to neighboring ground formation minimal.
High drilling accuracy
Drilling with the use of casings with high rigidity enables the finishing with high verticality.
Earth Drill Method
Utilization of bucket type drill by installing the casing by jacking for ground surface layer.
After completion of excavation, hole bottom is cleaned and reay mixed concrete is placed into the hole through tremmie pipes after installing reinforced steel cages for pile forming.
Features
All-in-one for full process
Earth drill can perform piling works for full process from excavation to placement of concrete by itself.
Scale reduction of equipment facilities
Compared with all casing method (full length of hole is driven with the casings) or reverse circulation method (drilled hole is protected with static pressure of circulation fluid without the use of casings), equipment facilities relating to the excavation can be reduced.
