| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent breakage of a polyethylene sleeve and erosion of a pipe caused by water intrusion from an end.SOLUTION: In a polyethylene sleeve 11 for preventing pipe erosion covered on an outer periphery of a pipe 1 buried underground, a water-absorbing swelling material 22 is provided on an inner peripheral side of a basic sleeve material 21 constituting an outer layer, and the water-absorbing swelling material 22 is sandwiched between the basic sleeve 21 and the pipe 1. The water-absorbing swelling material 22 on the inner peripheral side of the basic sleeve material 21 functions as a seal material, and thus, water intrusion from an end of the polyethylene sleeve 11 can be prevented. Even when breakage occurs in the basic sleeve material 21, the water-absorbing swelling material 22 swells by intrusion of groundwater, and functions as a self-repair material for closing the breakage, and therefore, water shielding performance can be maintained, and erosion of the pipe 1 can be prevented.</p> |
