Innovative culvert rehabilitation technique******

Multicrete是一家拥有超过25年经验的公司，专门从事土木工程应用中的喷射混凝土应用。喷射混凝土是水泥基材料，喷射在结构上以增加其强度。Multicrete在许多与采矿业相关的应用中使用喷射混凝土。本项目将引入喷射混凝土作为波纹钢涵洞修复的新应用。仅马尼托巴省的基础设施就有数百个钢波纹涵洞显示出恶化的迹象，需要加强或更换。更换涵洞可能非常复杂、昂贵且耗时。使用非开挖修复方法将允许加强这些结构，对结构上方的交通影响最小。能够满足这一需求将为Multicrete提供进入这一新市场并与其他承包商竞争所需的专业知识。* 本项目涉及在大直径波纹钢板（CSP）涵洞的变形段上应用钢筋喷射混凝土衬砌的施工和全面测试。将沿试验部分的纵向接缝沿着产生模拟变形。假定约2m长的金属壳体受到变形的影响。 CSP试验段将有剪力连接件连接到板的下侧，并有适当设计的钢筋。喷射混凝土将应用于钢筋上。将内衬CSP试验段放置在涵洞试验设施中，安装仪器，并覆盖一层压实良好的颗粒土，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矩形贴片载荷下进行失效测试。该试验将提供内衬性能和加强金属外壳抗弯刚度的信息。这一信息将有助于制定一个程序，以设计加强喷射混凝土壳，有效地维持进一步的痛苦的影响。

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.****