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厦门怡山商业中心塔楼共设大直径逆作板墙承压灌注桩24根,桩身直径2.4～3.2m,桩长50～60m,扩大头直径6.8m,单桩承载力32 000～51 000kN。结合工程地质条件,介绍了地下连续墙止水、逆作板墙施工、深井灌注桩施工、安全综合技术及后注浆技术等关键技术。以目前的试验设备及现场施工条件,无法进行本项目超大荷载静载试验,故在逆作板墙深井扩底灌注桩底-55m处用桩底平板荷载试验代替静载试验验证桩底持力层参数。实践证明,逆作板墙深井灌注桩成套施工技术应用效果良好。
Xiamen Yishan Commercial Center Tower has a total of large-diameter counter-pressure wall 24 pressure-bearing bored piles, pile diameter 2.4 ~ 3.2m, pile length 50 ~ 60m, expanded head diameter of 6.8m, single pile bearing capacity 32000 ~ 51000kN . Combined with the engineering geological conditions, the key technologies such as the sealing wall of underground continuous wall, the construction of counter-wall construction, the construction of deep-well bored pile, the comprehensive safety technology and the post-grouting technology are introduced. With the current test equipment and on-site construction conditions, the project can not carry out the super-load static load test. Therefore, the pile-bottom plate load test at -55m at the bottom of deep reverse- Layer parameters. Practice has proved that the application of deep well grouting pile construction technology is good.