在水利工程建设当中，为了避免由于混凝土因温度变化而产生的破坏，需在建筑物的适当部位分别设置伸缩缝，凡是不允许进水的伸缩缝内，都要安装上止水设备。而止水设备的安装，却是非常不易的。如果安装不好，就会产生渗漏现象，甚至还会影响整体工程的安全。为此，现以中心管 In the construction of water conservancy projects, in order to avoid the damage due to the temperature change of the concrete, expansion joints should be set at the appropriate parts of the building. Water-stop equipment should be installed in all expansion joints that are not allowed to enter the water. The installation of water stop equipment, but it is not easy. If the installation is not good, there will be leakage, and even affect the overall safety of the project. To this end, is the center tube