Device for determining reserved space of expansion joint during pipeline installation

The utility model belongs to the field of nuclear power plant installation, and particularly relates to a device for determining a reserved space of an expansion joint during pipeline installation, which comprises a telescopic pipe and flange connecting surfaces, the flange connecting surfaces are symmetrically arranged at two ends of the telescopic pipe, are fixedly connected with the telescopic pipe, and are connected with a pipeline flange to be connected through the flange connecting surfaces; the telescopic pipe can freely stretch out and draw back in the direction perpendicular to the flange connecting face. The device can effectively improve the installation accuracy of the pipeline, and determines the parallelism, the coaxiality and the installation distance of the expansion joint before installation in advance. 本实用新型属于核电厂安装领域，具体涉及一种用于管道安装时确定膨胀节预留空间的装置，该装置包括：伸缩管、法兰连接面，法兰连接面对称设于伸缩管两端，法兰连接面与伸缩管固定连接，通过法兰连接面与待连接的管道法兰连接，伸缩管能够沿与法兰连接面垂直方向自由伸缩。本实用新型装置能够有效提高管道在安装时的准确性，提前确定好膨胀节在安装前的平行度、同轴度和安装距离三个尺寸。