Buildsafe Geosynthetics-Buildsafe Geosynthetics

Prefabricated Vertical Drain ( PVD)

Time:2022-03-08 Times:207
Source:Buildsafe Geosynthetics

Prefabricated Vertical Drain ( PVD) is like a cross parallel strips made of polyethylene and polypropylene as core board and wrapped by non-woven fabric as filter layer. Core board is to play a supportive role and drain the leaking water and air out of ground. PVD is inserted into soft soil foundation by drilling machine, under the upper part of the pre-pressure loading, The pore water in soft soil will be drained out through plastic vertical drain to the horizontal drainage system, and drain outward to accelerate the soft ground consolidation.

Features :
1. The filtration performance is good, smooth drainage, drainage effect is guaranteed.
2. Materials have good strength and ductility, can be suitable foundation deformation capacity without affecting drainage performance.
3. The section size of drain is small, so disturbance is small too to the foundation when in operation.
4. Fast construction and working time is short. Each drilling machine can finish over 15,000 meters, which greatly save cost and shorten the construction period.
5. Flexible construction and low requirement to construction environment, applicable to variety of soft soil foundation and super soft soil foundation reinforcement treatment.

Appearance :
1. Appearance of packing: pie form, middle rolled as a round; 200m/piece; diameter 0.8-1.3m; thickness in 0.1m.
2. Section: harmonica form, cross-core structure.

Technical Data

Item	Performance Test		Unit	Type				Remark
Item	Performance Test		Unit	SPB-A	SPB-B	SPB-C	SPB-D	Remark
Complex	Setion Size	Width	mm	100±2	100±2	100±2	100±2
	Setion Size	Thick	mm	≥3.5	≥4.0	≥4.5	≥5.5
	Vertical Flow Capacity		cm³/s	≥15	≥25	≥40	≥60	Side pressure 350kPa
	Compound Tensile Strength		kN/10cm	＞1.0	＞1.3	＞1.5	＞1.5	Tension is kN/10cm
	Elongation Percentage		%	＜10	＜10	＜10	＜10	Tension is kN/10cm
Filter Cloth	Penetration Coefficient		cm/s	≥5x10^-4	≥5x10^-4	≥5x10^-4	≥5x10^-4	Sinking into water in 24 hours
	Equivalent Aperture		µ/m	＜75	＜75	＜75	＜75	Aperture Ф98
	Tensile Strength	Vertical dry Condition	N/cm	≥15	≥25	≥30	≥35	10% of extension rate
	Tensile Strength	Horizon Wet Condition	N/cm	≥10	≥20	≥25	≥30	15% of extension rate
Core	Feature
	Structure			Core section is like a harmonica shape
	Raw Material			Polypropylene、Polyethylene
	Antibacterial Property			No Breeding