This project in Liwan District, Guangzhou, supports slurry treatment for metro shield-tunnelling work. The site images show a compact construction environment with slurry tanks, transfer piping, material-handling equipment, and filter presses arranged around the available operating space.
Shield slurry carries excavated fine particles and water from underground construction. Effective separation is necessary to control the circulating liquid, reduce the volume of wet spoil, and maintain an organized treatment area at a busy infrastructure site.
Project Background
Shield-Tunnelling Slurry
The solids in shield slurry can include clay, silt, fine sand, and ground-specific mineral material. Particle distribution and slurry rheology may change as tunnelling advances. The dewatering system must therefore tolerate normal variation while maintaining a repeatable operating sequence.
Restricted Urban Footprint
Metro construction sites frequently have limited space and strict traffic routes for trucks, excavators, and lifting equipment. The project photographs show treatment equipment installed close to buildings and material-handling areas. Vertical arrangement and careful routing of pipes and walkways help use the available footprint.
Slurry Dewatering Process
Feed Preparation
Before pressure filtration, slurry is normally collected and conditioned so solids remain sufficiently uniform for pumping. Correct mixing and controlled chemical dosing can improve drainage and cake formation, but excessive shear can damage formed flocs. Operators must adjust the process in response to changing ground conditions.
Pressure Filtration
The filter press closes a series of cloth-covered plates to form sealed chambers. The feed pump transfers slurry into the plate pack. Liquid passes through the cloth and exits as filtrate, while the retained solids gradually form a cake. The visible filtrate outlets allow operators to observe flow and identify abnormal chambers.
Site Installation and Commissioning
Equipment Integration
The press is integrated with tanks, pumps, pipelines, structural platforms, and the spoil-handling area. Pipe routes should minimize avoidable restrictions and provide isolation points for inspection. The discharge zone must remain clear so cake can be removed without interfering with the plate-opening sequence.
Operational Checks
Commissioning focuses on hydraulic closing, even chamber filling, feed-pressure development, filtrate clarity, cake release, and communication between site operators. Because tunnelling slurry can change over time, cycle records are useful for identifying when cloth cleaning, conditioning, or feed settings need adjustment.
Project Gallery
Practical Project Value
Pressure filtration separates water from excavated fines and produces a more manageable cake for site handling. The process also provides a controlled filtrate stream that can be evaluated for reuse or subsequent treatment. Reliable performanc