Innovative culvert rehabilitation technique******

Multicrete是一家拥有超过25年经验的公司，专门从事土木工程中喷射混凝土的应用。喷射混凝土是一种水泥基材料，它被喷在建筑物上以增加建筑物的强度。在许多与矿业相关的应用中使用喷射混凝土。本工程将介绍喷射混凝土修复波纹钢涵洞的新应用。仅马尼托巴基础设施省就有数百个波纹钢涵，它们有退化的迹象，需要加强或更换。涵洞的更换是非常复杂、昂贵和耗时的。采用非开挖修复方法可以加强这些结构，同时对结构上方的交通影响最小。能够满足这一需求将为Multicrete提供进入这个新市场并与其他承包商竞争的必要知识。****该项目需要在大直径波纹钢板（CSP）涵洞的变形部分上进行钢筋喷射混凝土衬垫的施工和全面测试。沿试件纵缝产生模拟变形。假设变形对金属壳的影响长度约为2 m。CSP测试部分将有剪切连接器连接到板的底面，并适当设计加固。喷射混凝土将涂在钢筋上。衬砌的CSP测试段将放置在涵洞测试设施中，用仪器测量并覆盖一层密实的颗粒土，覆盖深度约为0.5 m。它将在代表典型卡车双轮胎足迹的中心放置的矩形贴片载荷下进行失效测试。该测试将提供有关衬垫性能和增强金属外壳抗弯刚度的信息。这些信息将有助于开发一种程序来设计能够有效地承受进一步破坏影响的增强喷射混凝土壳。****

Multicrete is company with over 25 years of experience specializing in applications of shotcrete in civil engineering applications. Shotcrete is cement based material, that is sprayed on structures to increase their strength. Multicrete uses shotcrete in many applications related to mining industry. This project will introduce new application for shotcrete as rehabilitation to corrugated steel culverts. Manitoba Infrastructure alone has hundreds of steel corrugated culverts that show signs of deterioration and will need to be either strengthened or replaced. Replacement of culverts can be very complicated, costly and time consuming. Using trenchless rehabilitation methods will allow for strengthening these structures with minimal impact on the traffic above the structure. Being able to address this need will provide Multicrete the necessary know-how to enter this new market and compete with other contractors. ****This project entails the construction and full-scale testing of a reinforced shotcrete liner applied over a deformed section of a large diameter corrugated steel plate (CSP) culvert. A simulated deformation will be created along the test section's longitudinal seam. It is assumed that an approximately 2 m length of the metallic shell is affected by the deformation. The CSP test section will have shear connectors attached to the underside of the plates, and a suitably designed reinforcement. The shotcrete will be applied over the reinforcement. The lined CSP test section will be placed in the culvert testing facility, instrumented and covered with a well compacted layer of granular soil with a depth of cover of about 0.5 m. It will be tested to failure under a centrally placed rectangular patch load representing the footprint of dual tires of typical trucks. The test will provide information on the liner's performance and the flexural rigidity of the reinforced metallic shell. This information will be useful in developing a procedure to design reinforced shotcrete shells that are effective in sustaining the effects of further distress.****