By bentonite waterproof carpet in Shanghai urban rail transit 6 Line SMW Construction method of pile under outside control of all application cases, describes the construction of bentonite waterproof blanket technology, nodes processing and efficiency technologies. Key words: bentonite waterproof blanket ; SMW construction method of pile 1, engineering in Shanghai rail transit 6 line station and Jing Ming, Changqing road, Changqing road digging, about 100m, about in the Western 40m As a separate structure, the eastern section of about 60M for composite structures. West across the West, Newport, between all is working well, and the station, cross section of width expanded from West to East. Engineering support using Ф850SMW method, interpolation h section steel ( long 15￣25m ), Mixing with 425# ordinary Portland cement ( cement content for 20%, water/cement ratio to 1.5~ 1.6), cement mixing pile 28D age of unconfined compressive strength of not less than 1.5MPa, coring amount not less than the number of completed piles of 2%, close to the structure SMW Method piles considering outside 100mm Using 3 Road Ф609 Steel pipe support, support the horizontal spacing around 3m And apart from the first line of supports surrounding Purlin roof beam, the rest are steel wall purlins.
Foundation pit protection level for level III, fortification intensity 7 Seismic grade II-level, excavation depth of approximately 8.6 ~ 12.7m Using cut down jobs. Project SMW construction method of pile is full-proof waterproof using under sodium-natural bentonite waterproof blanket construction. 2, engineering focus 1) SMW construction method of pile flexibility are relatively large, from excavation to the bottom, waterproofing operations must quickly so construction floor as soon as possible, and guarantee the safety of Foundation pit. 2) composite structure wall surface of bentonite waterproof carpet construction, surface flatness is one of the key. When excavation SMW construction method of pile's surface to some extent would be destroyed, dismantling steel wall purlins residual concrete also can make the enclosure surface has high and low and very irregular, which makes it difficult of bentonite waterproof carpet laying. Although bentonite waterproof blanket construction to relatively high surface smoothness requirements, but in order to avoid empty drums of waterproofing layer still needs the base surface is necessary. 3) this project through Newport, West River, River approach is one focus of this construction. 4) separated structure of bentonite waterproof carpet shop hangs after the completion of backfill quality control is very important. 5) SMW construction method of pile in the construction required removal of the steel at the end and Grouting filled h -shaped steel after removal of the gap, reducing the impact on adjacent buildings and underground pipelines, but also reduce the effects of bentonite waterproof blanket.
6) Others, such as crack, well pipe is required for special treatment. 3, bentonite waterproof blanket introduction of bentonite waterproof blanket will be high sodium bentonite with acupuncture is evenly woven between the two layers of high strength and high tensile geo-textiles and carpet fabrics formed ; Bentonite waterproof blanket bentonite water swelling, compaction conditions on both sides were evenly formed a dense gel, effectively isolating the intrusion of water, forming an excellent waterproof layer. Bentonite waterproof from the 80 years in the United States the medium-term construction, began to be applied in the field of environmental protection, last century, 90 years to China, in Beijing, Shanghai, Guangzhou, Dalian, Changsha and Nanchang and other cities has been applied in recent years in the underground tunnels in Beijing Subway and other large scale applications.