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本文介绍了国內外埋藏式高压钢管道试验研究工作的进展情况、试验內容和方法、量测设备以及某些工程的试验成果,并进行了综合分析,得出以下几点结论: 1.钢衬周围的混凝土-岩石一般承担55～85％的內水压力,因而研究其力学特征是很重要的.在设计荷载下,实测的钢衬应力都不大,埋藏管的总体安全度都较高。 2.外水压力作用下钢衬的屈曲试验是新课题,目前在现場进行的试验研究工作不多,但外水压力往往是设计的控制因素,今后应开展更多的工作. 3.回填混凝土的质量和灌浆工作非常重要,它直接影响钢衬、混擬土和岩石的联合作用. 4.灌浆孔的填塞封孔工作应作好,否则将影响管道的防渗性能。 5.试验时的水溫和溫度变化对于试验成果的影响,也应给予注意。 6.试验程序、试验压力、分级大小、加卸荷速度等都需仔细研究后确定. 7.变形测量最好同时采用几种方法,以便补充验证.由于钢衬的变形不是轴对称的,设法直接测出钢衬的总体变形是很有意义的. 此外,在运转条件下,长期系统地观测溫度和徐变的影响也是很重要的.
This paper introduces the progress of the test and research work of the buried high pressure steel pipe at home and abroad, the content and method of the test, the measuring equipment and the test results of some projects, and makes a comprehensive analysis, and draws the following conclusions: 1. Steel liner The surrounding concrete-rock generally takes 55-85% of the internal water pressure, so it is very important to study its mechanical characteristics.When the design load is applied, the measured steel lining stress is not large, and the overall safety of the buried pipe is high. Buckling test of steel liner under external water pressure is a new subject. At present, there are not many experimental studies in the field, but external water pressure is often the control factor of design and more work should be done in the future. Concrete quality and grouting work is very important, it directly affects the joint action of steel liner, mixed clayey soil and rock. 4. Grouting hole sealing work should be done, otherwise it will affect the pipe impermeability. 5. Test water temperature and temperature changes on the test results, should also be given attention. 6 test procedures, test pressure, grading size, loading and unloading speed and so need to be carefully studied and determined 7. Deformation measurement is best to use several methods at the same time, in order to complement the verification.Because the steel lining deformation is not axisymmetric, try It is instructive to measure directly the overall deformation of the steel lining, and it is also important to systematically and systematically observe the effects of temperature and creep under operating conditions.