高效减水剂在预应力锚杆中的应用深圳某大厦基坑占地面积约９５００ｍ２，基坑深度为４．５～１６ｍ，采用人工挖孔护坡桩加锚杆支护体系，在基坑较深（１６ｍ）的西、北侧布置了两排共计１１９根预应力锚杆，锚杆总长２２ｍ，其中锚固段１５ｍ，设计极限抗拔力６００ｋＮ... Application of superplasticizer in prestressed anchors The footprint of a building in Shenzhen is about 9500m2, and the depth of the excavation is 4.5 to 16m. Manual excavation is used to protect the slope and piles, and the bolting system is used in the foundation pit. Two rows of 119 prestressed anchors are arranged on the west and north sides of the deep (16m). The total length of the anchor is 22m, of which the anchoring section is 15m, and the design limit pullout force is 600kN.