JEPAE

Business Jepae designs and builds various business infrastructures.

Steel pipe pile method

IWD method

A new field of rotation penetration steel pipe pile construction. It is a new concept construction technique that can be used for basic work of a wide range of buildings, as it is possible to construct high-strength medium-to-large-diameter steel pipes, unlike the current construction method that allows for small-diameter construction.

Method	IWD Method	P.H.C Method	Helical Method
Overview	· Attach blades and projections to high-strength medium and large-diameter steel pipes. Construction possible at the same time as drilling · Maximize bearing capacity with compression and tension forces with wings and pipes	· Ground excavation with crane auger screw and driving device	· Attach multiple blades to small-diameter steel pipe · Securing bearing capacity through ground friction and tip support
Ground application	Clay, Sand, Weathering Table	Clay, Weathering Table	Clay, Sand, Weathering Table
Benefits	① No need for drilling or grouting with the smart heavy machine ② Increased friction with rotational press fit, strong support for horizontal force ③ Large-scale construction possible with medium-to-large pile ④ No residual soil and construction possible in rainy weather ⑤ Eco-friendly with low noise and low vibration ⑥ Easy to make into big data with mobile implementation of construction data	① Drilling to the design depth ② Reinforcing support and friction at the tip of the pile with cement ③ Prevention of damage to the tip of the pile and the head	① Construction possible only by combining specialized equipment ② Ease of construction and shortening of construction period ③ Eco-friendly construction method that is noiseless and vibration-free ④ Construction is possible regardless of angle
Weak points		① Possibility of collapsing of the pore wall when the sand gravel layer is drilled ② Hard weathering platform is difficult to drill ③ Perforation causes peripheral relaxation ④ Excessive vibration and noise	① Because of the small diameter, the bearing capacity of one piece is weak ② It is not possible to construct the ground with a deep support layer

각 공법 시험현황
	IWD	P.H.C	Micro	Helical
File specifications	267MM×8T×600φ×6M	500MM/15M	508MM/15M	159MM×8T×500φ×4M
Design load	120~200 ton	100~150 ton	50~150 ton	110~130 ton
Construction period	50~70%	100%	100%	50~70%
Total construction cost	80%	75%	100%	90%
	Small and medium-sized equipment	Large equipment	Large equipment	Small equipment
Proof stress	Securing seismic resistance, horizontal force, and bearing capacity	Earthquake resistance and weak horizontal force	Weak bearing capacity by driving method	Weak bearing capacity due to the use of small pipes
Whether material loss	None	Dummy file occurrence	None	None
Required work space	1.2	4.0~	4.0~	1
Equipment	Rotary hydraulic heavy machine	Perforator + Hydraulic Driving + Crane + Mixer	Perforator + Hydraulic Driving + Crane + Mixer	Backhoe/Hydraulic Motor + Mixer
Construction amount per day	150~200M	200~300M	100~200M	200~300M
Depth ability	35M	30M	30M	20M
Process	Penetration → Connection → Head cleaning	Drilling → Casing → Grouting → Head cleaning	Drilling → Casing → Grouting → Head cleaning	Penetration → Connection → Head cleaning
By-product/waste	None	Occur	Occur	None
Vibration and noise	Lowness	Somewhat high	Somewhat high	Usually
Surrounding ground influence	None	Occur	Occur	None