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TOA-TONE BORING CO.,LTD.

We also manufacture cast-in-place piling machine.

To construct surface structures, the fundation by installing the piles into the ground is provided to support surface structures. Cast-in-place pile construction is the method to complete the piles by placing the concrete after installing the reinforced cage to be arranged on site into bore hole. Cast-in-place pile construction has various methods based on drilling method, pile diameter, pile length, etc.

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.

Piling works to construct the structures over the railway are allowed in night time only which suspends the train service to secure the safety of train services and passengers. The severe restriction of daily working time causes the lengthening of construction period and increase of construction cost.
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

TOA-TONE BORING CO.,LTD.

TOA-TONE BORING CO.,LTD.
TOA-TONE BORING CO.,LTD.
TOA-TONE BORING CO.,LTD.

DHB Method

Utilization of drill enabling drilling work at elevated place and securing the safety at ground surface.

Piling works to construct the structures close to the railway are allowed in night time only which suspends the train service to secure the safety of train services and passengers. The severe restriction of daily working time causes the lengthening of construction period and increase of construction cost.
"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

TOA-TONE BORING CO.,LTD.

TOA-TONE BORING CO.,LTD.
TOA-TONE BORING CO.,LTD.
TOA-TONE BORING CO.,LTD.

TBH Method

Utilization of drill applying reverse circulation system.

TBH(Tone Boring Hole)Method is utilized as a standard drilling method for cast-in-place pile construction and TBH drill has reverse circulation system and top drive type mechanism.
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

TOA-TONE BORING CO.,LTD.

TOA-TONE BORING CO.,LTD.
TOA-TONE BORING CO.,LTD.
TOA-TONE BORING CO.,LTD.

MPD-TBH Method

Utilization of drill with telescopic type extendable leader to enable smooth drilling under low headroom space.

MPD-TBH Method is one of TBH method and has advantages as better mobility and more efficient operation at job site with height limit. The machine has reverse circulation system and top drive type mechanism and has an advantage for larger diameter drilling to construct parmanent pile compared with BH method.

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

TOA-TONE BORING CO.,LTD.

TOA-TONE BORING CO.,LTD.
TOA-TONE BORING CO.,LTD.
TOA-TONE BORING CO.,LTD.

BH Method

Utilization of spindle type drill applying direct circulation system

BH(Boring Hole) Method is a standard drilling method applied to cast-in-place pile construction as well as TBH method. This method is carried out by means of spindle type drill with 18.5 kW horse power and rotation of wing bit installed at the low end of drill rods.
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

TOA-TONE BORING CO.,LTD.

TOA-TONE BORING CO.,LTD.
TOA-TONE BORING CO.,LTD.
TOA-TONE BORING CO.,LTD.

Rotary Casing Method

Utilization of rotary casing jacking machine to install the casing for full length of the hole.

Rotary Casing Method is to install the casings by rotating and pressing them with great rotating torque for full length of the hole. Then, the excavation inside the casings by means of hammer grab is carried out to remove gravels or underground obstacles.
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.

TOA-TONE BORING CO.,LTD.

TOA-TONE BORING CO.,LTD.
TOA-TONE BORING CO.,LTD.

Earth Drill Method

Utilization of bucket type drill by installing the casing by jacking for ground surface layer.

Earth Drill Method is to drill by removing the earth and sand stored in the drillng bucket which is rotated and pulled up after excavation. Since this method can reduce the volume of removed soil and concrete to be placed, under-reaming bucket can be applied.
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.

TOA-TONE BORING CO.,LTD.

TOA-TONE BORING CO.,LTD.
TOA-TONE BORING CO.,LTD.