cobblestone It is widely used in public buildings, villas, courtyard buildings, pavement (the cobblestone road paved in the park has the effect of longevity), parks Rockery 、 bonsai Filling materials, garden art and other high-level superstructure. It not only carries forward the ancient oriental culture, but also reflects the western classical, elegant, and simple artistic style.

The pebbles are also clean water sewage disposal Power, garden and other projects have provided high-quality materials. Also for ceramics , precision casting, paper making, jet milling, chemical industry, monocrystalline silicon, national defense, etc.

Nanjing Riverstones Physical parameters of

Material: more than 95% silicon dioxide (SiO2)

Performance parameters: surface finish 98%, compressive strength above 600 Kg/M2.

transformer Pebble standard

The standard issued by the Ministry of Construction has provisions, large Oil immersed transformer An oil storage tank shall be set at the lower part, with an area slightly larger than the plane occupied by the transformer, a depth of about 1M, and cobbles with a diameter of about 8-10CM shall be laid to absorb oil leakage from the transformer.

Relevant standards:

It is 50-80mm as specified in 7.3.4 of DL5027-1993, a typical fire protection code for electrical equipment.

Code for Design of 3-110KV High Voltage Switchgear (GB 50060-92), 5.4.5 A cobble layer with a thickness of no less than 250mm should be laid in the oil storage tank, and the diameter of the cobble should be 50-80mm.