slurry separation system for TBM

(1)What is TBM

TBM also known as a “mole”, is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata. They can bore through hard rock, sand, and almost anything in between. Tunnel diameters can range from a metre (done with micro-TBMs) to almost 16 metres to date. Tunnels of less than a metre or so in diameter are typically done using trenchless construction methods or horizontal directional drilling rather than TBMs.

(2)Tunnel Boring Machine (TBM) Method

There are two major shield methods around: earth pressure balanced (EPB) and slurry type shield machine. Selection of shield method depends on ground conditions, surface conditions, dimensions of the tunnel section, boring distance, tunnel alignment and construction period. Both are closed-face type shield machines, meaning the “head” part of machine is “closed” and separated from the rear part of machine. The “head” has a working chamber filled with soil or slurry between the cutting face and bulkhead to stabilize the cutting face under soil pressure . The EPB type shield machine turns the excavated soil into mud pressure and holds it under soil pressure to stabilize the cutting face. It has excavation system to cut the soil, mixing system to mix the excavated soil into mud pressure, soil discharge system to discharge the soil and control system to keep the soil pressure uniform. Therefore, EPB may not be applicable for the rocky soil that is difficult to turn the excavated soil into slurry. It can be used at ground predominated by clayer soil. The slurry type shield machine, on the other hand, uses the external pressurized slurry to stabilize the cutting face, similar to bored piles or diaphragm walls using bentonite to contain the trench wall. The slurry is circulated to transport the excavated soil by fluid conveyance. Besides having excavation system, the slurry type shield machine has slurry feed and discharge equipment to circulate and pressurize slurry and slurry processing equipment on the ground to adjust the slurry properties

(3) 400 slurry separation system is composed of the following items:

1 ZS83-3 shale shaker 2sets , with 2.7m3 pyramid screen area and max 7.0G vibrating strengthThe shaker screen is not same as common oil drilling shaker screen, it is a kind of slit type shaker screen, material is stainless steel wire. It can process large solids such as rocks, the function is same as scalper. But if the solids in the mud is not so large, you can change a small mesh screen so that the treatment effect could be better, so it is much flexible than scalper.  

2 ZJ83-3 desander 1set, use 3 pcs 12” PU hydrocyclones with underflow shaker ZS83-3

3 ZJ83-3 desilter 1 set, use 18pcs 5” PU hydrocyclones with underflow shale shaker ZS83-3

 5”  Hydrocyclones can process larger capacity than conventional 4” cone, and it is not easy to jam the inlet of desilter. The ZJ83-3 desilter is designed of round arrangement, the round arrangement is with compact structure and better performance than horizontal line.

4 75KW Centrifugal pump, 2 sets with mechanical seal

5 jet mud mixer unit in a separate skid

6 Mud agitator 2sets

7 settling mud tank

8 Circulation mud tank

Tangshan Aojie Petroleum Machinery Equipment Make Co., Ltd (Short for: 

OGEM Solids Control)

Address: NO.2 Jingxi Road,Lunan District,Tangshan city,Hebei 

province,China

Tel: 86-315-8676484

Fax: 86-315-2648099

Zip Code: 063000

Email: ogem2@ogemsolidscontrol.com

Website: http://www.ogemsolidscontrol.com/

Skype:burning_lee