顶进施工法钢筋混凝土排水管局部变形测试与分析

为了检测钢筋混凝土排水管质量,采用外压荷载试验,通过荷载-应变曲线对2根钢筋混凝土排水管的裂缝荷载以及在各级荷载作用下的局部变形进行分析。测试结果表明,各测试面均出现不同程度的局部变形和裂缝。顶部为荷载集中区域,应变较大;两侧裂缝多居于管外壁,内壁较少。1号管裂缝荷载值为325 k N/m,2号管裂缝荷载值为324 k N/m。相同荷载下,1号管比2号管表现出更好的延展性能,具有更高的承载能力。2根钢筋混凝土排水管均满足GB/T 11836—2009《混凝土和钢筋混凝土排水管》Ⅲ级管裂缝荷载标准。

Test and analysis of local deformation of reinforced concrete drainage pipes in jacking construction method

For the detection of reinforced concrete drainge pipes' quality, load test of the external pressure was carried out, and the cracking load of two reinforced concrete drainage pipes and the local deformation under different load were analyzed through load-strain curve. The test results indicated that the test surface showed varying degrees of local deformation and fracture. As top of pipes was the concentrated area of load, the defor-mation was larger; cracks happened on the outer wall of the pipes are much more than that happened on the in-ner wall. The cracking load values of pipe 1 and pipe 2 were 325 and 324 kN/m respectively. Under the same load, pipe 1 had better ductility and higher bearing capacity than pipe 2. The quality of the said two reinforced concrete drainage pipes both met the requirement of class Ⅲ piping crack load standard in GB/T 11836—2009 Concrete and Reinforced Concrete Drainage Pipe.