为解决微型管廊渗水积水、检修困难和施工空间受限等问题，推动微型管廊在老旧城区的广泛应用，通过分析，创新性地在微型管廊盖板间设置榫卯结构和加设胶质薄膜，解决盖板渗水问题；在微型管廊底部设计排水与管线出线空腔，解决微型管廊积水问题；通过设计平躺式检修系统（包括导轨、可升降滑动检修床等），解决因微型管廊空间狭小引起的检修困难问题；通过设置混凝土衬墙和取消基坑肥槽以最大限度减小微型管廊施工所占空间。最后，以多宝路历史文化街区市政基础设施提升工程项目为例，介绍2条街巷微型管廊设计的总体理念、技术手段和实施方法。研究表明： 在微型管廊底部设置排水与管线出线空腔，不仅可以更集约化地布管及保证管廊不积水，而且能避免管线在微型管廊顶部出线造成的检修困难；微型灌注桩+内撑+衬墙的组合方式可以满足施工场地受限情况下的施工需求，且基本不影响两侧现有建筑的安全。

Microutility tunnels are always limited in space, leak, and difficult to maintain. To promote such tunnels in old urban areas, innovative solutions are proposed, including the installation of mortise and tenon joints and the application of a rubber membrane between the covers of a microutility tunnel to resolve water infiltration issues, the design of drainage and cable outlet cavities at the bottom of the tunnel to avoid water accumulation, the development of a lie-flat maintenance system with guide rails and upgradable sliding maintenance beds to address maintenance difficulties caused by the confined space within the tunnel, and the implementation of concrete lining walls and the elimination of expansion slots in foundation pits to minimize the space occupied by microutility tunnel construction. Herein, a case study is conducted on the municipal infrastructure upgrade project in the historic and cultural district of Duobao road. The overall concept, technical approach, and implementation method for the design of microutility tunnels in two streets are presented. The research results demonstrate that incorporating drainage and cable outlet cavities at the bottom of microutility tunnels facilitates a more compact layout of pipelines, ensures no water accumulation in the tunnels, and avoids the maintenance difficulties that arise from cable outlets positioned at the top of microutility tunnels. The combination of micropiled foundation, internal braces, and lining walls can meet the requirements of limited construction sites and minimally impact the safety of existing structures on both sides.