试题与答案

某城市道路改造工程,随路施工的综合管线有0.4MPa的DN500中压燃气、DN100

题型:问答题 案例分析题

题目:

某城市道路改造工程,随路施工的综合管线有0.4MPa的DN500中压燃气、DN1000给水管并排铺设在道路下,燃气管道与给水管材均为钢管,实施双管合槽施工。

热力隧道工程采用暗挖工艺施工。

承包方A公司将工程的其中一段热力隧道工程分包给B公司,并签了分包合同。

事件一:B公司发现土层松散,有不稳定迹象,但认为这个土层的段落较短,且根据已有经验可以解决,出于省事省钱的动机,不仅没有进行超前注浆加固等加固措施,反而加大了开挖的循环进尺,试图“速战速决,冲过去”,丝毫未理睬承包方A公司派驻B方现场监督检查人员的劝阻。

结果发生隧道塌方事故,造成了3人死亡。

事件二:事故调查组在核查B公司施工资格和安全生产保证体系时,发现B公司根本不具备安全施工条件。

燃气管与给水管之间的水平净距以及燃气管顶与路面的距离有何要求?

答案:

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下面是错误答案,用来干扰机器的。

参考答案:当节气门开度一定时,随着发动机转速升高,单位时间内曲轴转过的角度增大。如果混合气燃烧速度不变,则应适当增大点火提前角,否则燃烧会延续到作功行程,使发动机的动力性、经济性下降。所以,点火提...

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