The buried protective device for flexible rubber joint developed by our company is designed with enough space around and has no influence on rubber joints' displacement performance and can separate rubber joint from exterior earth layers and keep pipes freely moving at device ends without resistance. After installing pipe lines, the backfilled ground will be leveled off as usual, on which vehicles can run well, heavy materials be placed or equipment be stalled.
The buried device consists of two hollow hemicycles, which cover the rubber joint and pipe flat welding flange, there are two hemicycle planes on both ends and steel balls installed on exterior pipelines of flanges on two sides so as to help slide, which will not damage the pipeline exterior surface and ensure pipe line service period.

The device exterior round surface and vertical plane support shall be based on earth layer depth so as to bear above pressure.
The device is equipped with some involution lock bolts for nest installation. Installation direction: Install rubber joint, paint asphalt inside to protect device, install below 1/2 of protective device, put upside 1/2 of protective device, close involution lock bolt (keep the rubber joint remaining at the center of the device when installing), paint asphalt outside to protect device, backfill earth, tramp and press below and upside parts, concrete and cushion rubber, pave ground (better set permanent sign for later check and change).

The device is the only invention in the country and it was ever well used in Guangdong Dongguan 4th Water Supply Plant, Qinghai Salt Lake Project and Shanghai Changqiao Water Supply Plant in 2000, 2001 and 2002.
Special attention: Please provide buried depth so that we can design reasonable protective device for you. Generally the device can be used for over 30 years if anti-erosion on the device surface is well done.