• Summary
• Specification
• Examples

Shape and types

• DHD structure
• DHD200
• DHD300

Advantage

Drainage performance test results

Drainage performance test results

Hydraulic gradient	Pressure	Result
		Horizontal permeability (cm/sec)	Discharge capacity (㎤/sec)
i=0.5	50kPa	116	1,045
	120kPa	107	968
	150kPa	106	962

(ASTM D 4716, DHD300)

Drainage performance comparison

Application

Advantages

• • Reduces construction costs greatly by replacing expensive sand or aggregate
• • Reduces construction costs more than 50% compared to other methods
• • No problem with drainage even under high earth pressure
• • High settlement characteristics flexibility
• • Very few joints – less joint damage
• • Light, flexible, and easy to construct
• • Easy to link because of fewer joints
• • Reasonable construction costs
• • Good supply and convenient to convey to the construction site