Views: 0 Author: hmudcleaning Publish Time: 2023-06-15 Origin: Site
What is a muddy water shield? What is a muddy water shield? How does a muddy water shield work? What solids control equipment is needed in a muddy water shield? Do you have these questions too, so today HL's editor will give you a simple introduction.
Muddy water pressurized balance shield: A partition is set at the front of the mechanical shield, and a muddy water tank is formed between the cutter head. The stability of the excavation surface is to send mud into the mud water tank, and use mud on the excavation surface an impermeable mud film is formed, and the water pressure is maintained by the tension of the mud film to balance the earth pressure and water pressure acting on the excavation surface.
The excavated soil and sand are transported to the ground in the form of mud, separated by mud water treatment equipment, and the quality of the separated mud water is adjusted before being transported to the excavation surface.
The mud water shield machine delivers pressurized mud water to the sealed mud water tank to obtain the stability of the excavation surface. For the impermeable clay, the mud pressure is appropriately greater than the active earth pressure of the surrounding rock, and the tunnel excavation surface can be stabilized; For sandy soil with large water permeability, the mud will penetrate to a certain depth in the soil layer, and in a short time, an impermeable mud film will be formed on the surface of the soil layer, causing the pressure of the mud to be generated on the excavation surface and the work surface. The muddy water pressure that the soil pressure and the water pressure counterbalance to maintain the stability of the working surface. When the mud water pressure in the mud water tank is greater than the formation pressure and water pressure, the ground surface will uplift; when the mud water pressure in the mud water tank is less than the formation pressure and water pressure, the ground surface will sink. Therefore, the mud water pressure in the mud water tank should be balanced with the earth pressure and water pressure of the formation.
It is mainly composed of bentonite, CMS, soda ash and water; the role of bentonite improves the viscosity, specific gravity, suspension, and thixotropy of muddy water; the role of CMS (methylated starch) reduces the water loss rate, increases the viscosity, and adjusts the pH value of soda ash and disperses the muddy water particles.
A mud film is formed on the soil surface of the excavation surface, and the thickness of the mud film increases with the increase in penetration time, thereby effectively improving the resistance to penetration. Support and stabilize the excavation surface soil. The shield uses the mud water pressure and the front soil pressure to produce a mud water balance effect, which effectively supports the front soil. Cooling and lubricating cutting equipment such as cutter heads and knives.
The mud water transportation system transports the adjusted slurry to the shield mud water tank through the mud pump and the mud pipe. The mud formed by the soil and sand cut by the cutter head and the muddy water in the mud water tank is separated by the mud water treatment sub-system sent to the ground by the mud pump and the mud pipe. The muddy water conveying system is mainly composed of mud sending and discharging pumps, valves, mud feeding and discharging pipelines and supporting parts, etc., which are automatically operated through the muddy water monitoring sub-system.
What solids control equipment is needed in the mud water shield? Xi'an HL Petroleum Equipment Co., Ltd. produces the mud water separation equipment, mud vibrating screen, desander, desilter, decanter centrifuge, etc. that are required in the shield. Welcome to send inquiry to us: sales@hlsolidscontrol.com if you are interested in these mud water separation equipment.
