道路网连通性度量方法的研究进展和展望——从规范制定的角度探讨如何在中国推广街区制

Research Progress and Prospects of Street Connectivity Measurements: A Study on How to Popularize Block System in China from the Prospective of Regulations

中国街区制的推广,意在通过打通城市的毛细血管,提高道路网的连通性。充分而全面地掌握道路网连通性的度量方法能够有效指导建设施工活动,是在实践中提高道路网连通性的前提。为全面了解国内外关于道路网连通性的研究进展,本文通过梳理和分析相关文献,对当下城市规划中常用的道路网连通性度量方法进行归纳和总结,探讨了其中的不足,并对今后的研究趋势进行了展望,认为"街区单元法"在指导规范制定的过程中具有较强的适应性和可操作性。基于我国街区制推行的初衷和落实过程中遇到的困难,强调了出台相关规范、设定阈值指标的必要性。本文选取南京的两个地块,运用"街区单元法"对道路网连通性的改善进行了演示,进一步探讨了在"改造"和"新建"两种活动中如何通过设定阈值指标的方式高效地保证城市道路网的连通性。

The popularization of block system in China was aimed at improving the street connectivity,with the method of breaking through the branches of streets.Grasping the overall situation of measurements is the precondition of improving the street connectivity in the process of construction.In order to fully understand the research progress of the street connectivity worldwide,this paper summarizes the frequently-used measurements of evaluating the street connectivity by sorting out and analyzing relevant literatures.We also point out some existing shortcomings and outlook the future research trend.Block section measurement is considered as an adaptive and feasible way to help popularize block system.Following the original intention of popularizing block system and realizing the difficulties of practice,this paper emphasizes the necessity of introducing related regulations and setting a threshold value.Two blocks of Nanj ing,J iangsu Province,are selected to verify the feasibility of the block section measurement.This paper further discusses how to effectively guarantee the connectivity of block system by using a threshold value in the process of transformation and construction.