存在渗透地下水的软岩深基坑,通过在地下室底板设置盲沟排水+多次重复注浆防水等"疏堵结合"的防排水措施,避免底板因地下水浮力、渗透压力影响结构稳定和耐久.施工阶段临时排水沟按照导水盲沟的位置、尺寸开挖,实现临时排水沟与盲沟的永临结合,在集水井内嵌套布置临时水箱,实现底板干作业,确保底板底防水层及底板混凝土浇筑施工质量.地下水通过盲沟系统进入雨水回收系统,可作施工用水与医院中水,节约水资源.逆作法施工时,底板混凝土的收缩容易造成底板与地下连续墙接缝开裂,将多次重复注浆工艺用于接缝防水,既解决施工阶段的孔隙和裂缝封堵,也为使用阶段裂缝防治提供便捷方案.

The main problems in the concrete construction of the underground accelerator room of the whole top-down building are as follows:it is difficult to guarantee the strength of C40 concrete prepared with brittle barite;the segregation is caused by downward transportation of concrete,and there is difficulty of simultaneous pouring in large quantities in limited space;mass concrete is prone to temperature cracks.The following measures have been taken:the qualified radiation-proof concrete is prepared by carefully selecting the material;the pressure relief deviceis used to solve the downward conveying segregation,and multi-group construction to achieve generous pouring;temperature cracks are effectively controlled through internal cooling,external heat preservation and repeatedly temperature measurement.The technology meets the requirements of crack control,therefore the pouring quality proves good.

0引言 随着社会经济高速发展,人们的美学追求越来越高,特别是在建筑行业,造型优美、流线变化的旋转楼梯元素应用越来越常见.但是,旋转楼梯复杂的空间形态给图纸信息表达、识读带来了挑战.传统CAD的表现方式以2D平面图为主,图纸元素以点、线、面的方式呈现,这些信息分散于不同的图幅,空间整体表达能力有限.旋转楼梯CAD图纸指导现场施工存在空间底模标高位置控制难度大、模板放样准确度低、楼梯底模接缝处容易错台、底模无法平滑连续、浇筑完成观感质量不佳、难以保证工程质量等问题.

"你发财,我发展"是安徽省毫州市招商引资的响亮口号.可是一位投资商斥资千万元、历时四年多投资该市城市改造,收获的却是"我被套,你被告",投资商、当地政府双双受损,而"受伤"最深的还是当地的招商形象.这一事件折射出一些地方从基层政府、部分群众到有关司法机关都忽视了"法"字,是法治的"缺失"带来了投资环境的恶化.