Ceramic inspection well cover and its preparing method

Abstract

This invention relates to a ceramic manhole cover made from ceramic material. The raw material to produce this ceramic and their percentages are: 2-100% Al2O3, 0-95% MgO, 0-74% SiO2, 0-15% SiC, 0-20% ZrO2, 0-15% Si3N4, 0-15% B4C, 0-15% SiO2, 0-15% B2O3, 0-15% TiO2, 0-10% Li2O, 0-2% CaO, 0-2% TiO2 and 0-6.2% ZnO. The sum amount of Al2O3, MgO and SiO2 is not less than 65%. The preparation method is as follow: first, produce preforms with the raw material; under 40-100MPa pressure, these preforms are pressure formed, surface strengthened and plasticized. Advantages: good in anti-bending strength, good fracture toughness. As the cover has no recovering value, the possibility of being stolen is reduced.

Description

technical field [0001] The invention relates to a ceramic manhole cover and a preparation method thereof. Background technique [0002] Existing manhole covers or manhole covers are generally made of cast iron. Because the materials have recycling value, they are often stolen and lost seriously. Vehicle damage and casualty accidents often occur in manhole covers that lose their manhole covers. For anti-theft people one, consider using anti-theft device on the structure of manhole cover, such as Chinese patent 93237579,95241036,96232738,99227151 or the like; But the problem that they exist is: (one) take the cast iron anti-theft manhole cover that locks between well cover and well ring, no matter how tight the anti-theft mechanism is, people can still steal it, and its lock cylinder can rust and cannot be opened after a long time, affecting Normal pipeline dredging and maintenance work. (2) The periphery of the manhole cover that adopts reinforced concrete or fiberglass mat...

AI Technical Summary

Problems solved by technology

But the problem that they exist is: (one) take the cast iron anti-theft manhole cover that locks between well cover and well ring, no matter how tight the anti-theft mechanism is, people can still steal it, and its lock cylinder can rust and cannot be opened after a long time, affecting Normal pipeline dredging and maintenance work

(2) The periphery of the manhole cover made of reinforced concrete or glass fiber reinforced plastic is easy to break, or even collapse as a whole

(3) Manhole covers made of plastic materials have very poor wear resistance, aging resistance and chemical corrosion resistance, and their bearing capacity decays quickly, which cannot meet the requirements of heavy traffic on urban roads