Jianhu Shengyuan Soft Base Material Co., Ltd. sets out the layout rules for vertical plastic drainage boards in soft ground treatment
Jianhu, Jiangsu, November 2026 — On a soft ground site, the first layout decision is where the vertical plastic drainage boards go, and how far past the building line the field should reach.
Soil within a certain distance outside a building foundation still carries compressive and shear stress from the structure above. The drainage board field therefore needs to cover slightly more ground than the foundation footprint. Extending the field 2 to 4 metres beyond the foundation outline lets the soil outside the footprint consolidate as well, which in turn supports the stability of the ground as a whole.
On plan, the boards are set out in one of two patterns: a square grid or an equilateral triangle grid. The pattern governs spacing, the number of boards per unit area and how the drainage paths link up across the treated zone.
Jianhu Shengyuan Soft Base Material Co., Ltd. produces the board used in such works at its plant in Jianhu, Jiangsu. Eight plastic drainage board lines run at a combined 600,000 metres per day, and integral hot-melt lines add a further 500,000 metres per day. The company also covers the installation side: 50 drainage board and sand-wick rigs, 33 deep mixing pile machines and three one-metre stone column rigs can be mobilised to site, keeping board supply and driving work in one team.
The board has been applied in airport, port and reclamation projects, including Shenzhen Airport, Shanghai Pudong Airport Phase III, Ningbo Beilun Port Phase III, the Hangzhou Bay Bridge approach lines, Yangshan container terminal land formation and Huanghua Port reclamation phases, as well as reclamation work at Sihanoukville in Cambodia and Pasay in the Philippines.
Shengyuan is a member of the China Geosynthetics Engineering Association and produces plastic drainage board, geogrid and geocell, with soft ground treatment construction offered as a combined service.
www.sywickdrain.com
Jianhu Shengyuan Soft Base Material Co., Ltd.
