Features of Heavy Nodular Cast iron manhole cover:
1) Shockproof: the U-shaped groove is set at the end of the well ring, and T-shaped synthetic rubber strip is embedded into the U-shaped groove, so as to play a buffer role and reduce the vibration force during the contact process between the well cover and the well ring。
2) Anti noise: the contact occlusal surface between the well cover and the well ring directly acts on the T-shaped rubber strip to overcome the rigidity with softness and eliminate the noise。
3) Anti theft: a square groove is protruded on the outer ring of the well cover. The open ring at the inner wall end of the well cover is connected with the well cover through the fixed shaft of the well seat, and the inner wall of the other end is fixed with a pin body to prevent theft. When the well cover is opened and placed for 90 degrees, the well cover can be taken down to facilitate construction. The concealed lock adopts nylon bush, never rust, and is equipped with special tools to open, safe and reliable.
3d捕鱼4) Anti slip: the surface of well cover is made of 3 mm raised pattern, so as to play a good anti-skid effect。
5) Anti displacement: four riveting bolt holes are reserved in the well circle, and the anti-theft well cover is evenly distributed at 90 degrees. Each set uses 4 ground anchor bolts, which avoids the displacement due to mechanical rolling in the road construction process, and plays a certain anti-theft role.