一种用于地下管廊浇筑施工自动化模架及配套设备

随着城市地下空间的综合利用力度不断加大,地下综合管廊建设日益成为市政建设工程中非常重要的一环,而传统的满樘支架法施工工效低、劳动密集度高、施工材料浪费严重的情况日显突出,文章提出一种适用于地下管廊浇筑施工的自动化模架设备,通过自动周转小车与可伸缩内模架配合循环使用,提升施工效率,节约施工成本,实现了地下管廊的绿色施工。

The “Wrong Love” Between the Zone of Proximal Development and Scaffolding:An Interview With Prof.James P.Lantolf

The zone of proximal development(ZPD) and the scaffolding theory are very different,both in terms of their theoretical origins and connotations,and can even be said to be very different.However,during the development of the two concepts,some scholars have misunderstood them,resulting in the two being mistaken for similar concepts and therefore often confused.Professor James Lantolf from Pennsylvania State University(State College,USA) was interviewed by Professor Lili Qin from Dalian University of Foreign Studies(Dalian,China) and provides an indepth analysis of these issues.The interview begins with the theoretical roots,connotations and definitions of the ZPD and scaffolding concepts,and then unravels the story of how they have been“mistakenly loved for life”,and ultimately it is made clear that the two concepts are completely different in their practical application to language teaching and should not continue to be used interchangeably.

Multi-loop Internal Model Controller Design Based on a Dynamic PLS Framework

In this paper,a multi-loop internal model control(IMC) scheme in conjunction with feed-forward strategy based on the dynamic partial least squares(DyPLS) framework is proposed.Unlike the traditional methods to decouple multi-input multi-output(MIMO) systems,the DyPLS framework automatically decomposes the MIMO process into a multi-loop system in the PLS subspace in the modeling stage.The dynamic filters with identical structure are used to build the dynamic PLS model,which retains the orthogonality among the latent variables.To address the model mismatch problem,an off-line least squares method is applied to obtain a set of optimal filter parameters in each latent space.Without losing the merits of model-based control,a simple and easy-tuned IMC structure is readily carried over to the dynamic PLS control framework.In addition,by projecting the measurable disturbance into the latent subspace,a multi-loop feed-forward control is yielded to achieve better performance for disturbance rejection.Simulation results of a distillation column are used to further demonstrate this new strategy outperforms conventional control schemes in servo behavior and disturbance rejection.

混凝土空心梁自落架内模施工工艺研究

钢筋混凝土空心梁板连动杆式自落架内模体系,由钢板、型钢加工,内部支撑杆件为可拆卸结构,支撑杆件间及杆件与模板连接采用螺栓铰接,拼组拆卸方便,宜于维护和运输。具有强度高、刚度大、不变形、易固定、拼装拆卸方便、使用效率高、循环使用次数多、经济效益明显等诸多优点。本文通过在多个项目实践的基础上,总结提炼出钢筋混凝土空心梁板自落架内模施工工艺。

跨既有线高铁大跨窄幅变截面转体梁施工技术

新建商合杭铁路西苕溪左、右线特大桥为主跨128 m单线铁路连续梁,跨宣杭铁路,桥面全宽7.4 m,采用变截面设计,转体法施工。为实现悬灌梁快速施工,有效解决变截面内模安装、拆卸工序繁杂、费工费力,研究使用了轻型挂篮、可调变形内模架技术。通过变形架宽度调节,达到了连续梁内模架体自行收缩和加固,无需重复拆卸,实现了变截面箱梁快速化施工。针对本桥长细结构转体工况,在进行称重试验同时考虑荷载分部效应,合理优化配重方案,并在受力薄弱部位设置应力传感器,监测混凝土工况,同时为预配重提供参考值,提高转体安全性,确保大跨度窄截面梁体结构转体成功。