众所周知，灌筑混凝土应连续操作，不得间歇，如必须间歇时，间歇时间应尽量缩短，且在前层混凝土凝结前，将次层混凝土灌毕。但由于技术上和施工组织上的原因，灌筑工作实际出现多次间歇，而且间歇时间都在150min以上，致使原灌筑的混凝土已经初凝。此时间歇部位就形成了施工 As we all know, the concrete should be continuously operated without intermittent. If it is necessary to be intermittent, the interval should be shortened as much as possible, and the concrete of the sub-layer should be poured before the concrete of the front layer is set. However, due to technical and construction reasons, the actual construction of the irrigation work has been intermittent for many times, and the interval time is more than 150 minutes, resulting in the initial concrete being poured. At this time, the intermittent part formed the construction.