Cast stone manhole cover and its preparation method

A technology for manhole covers and manhole covers, which is applied in the field of cast stone manhole covers and their preparation, can solve the problems of rapid bearing capacity attenuation, damage, corrosion of lock cylinders, etc., and achieve the effects of reducing possibility, bending strength and fracture toughness

Inactive Publication Date: 2005-08-10
吕云南
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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
(5) Manhole covers made of natural stone are inevitably damaged due to the existence of natural textures

Method used

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preparation example Construction

[0016] The preparation method of the cast stone manhole cover of the present invention may include the following steps: material preparation, batching, melting, adding reinforcement materials, molding, crystallization and annealing, inspection and selection, and surface enhancement.

[0017] 1. Preparation

[0018] The base material is crushed by jaw crusher to 30-100 mm; the additional material is coarsely crushed by jaw crusher and finely crushed by wheel mill, and the particle size is controlled below 3 mm; chromite is crushed by ball mill to less than 175 mesh; the fiber blended into the melt is chopped to 8-1000 mm.

[0019] 2. Ingredients

[0020] After the raw materials are processed up to the standard, the ingredients can be carried out. Commonly used methods for ingredients are "matching method" and "phase balance method". The matching method is to compare the chemical composition of the same type of cast stone products with the chemical composition of the selected...

Embodiment 1

[0036] Example 1: cast stone manhole cover, its cover body is made of 75wt% basalt, 4wt% chromite, 2wt% fluorite, 6wt% quartz sand, 1wt% iron scale and then added 12wt% alumina ceramic chopped fiber casting made.

[0037] The specific production method is as follows: crush the basalt with a jaw crusher to a particle size of 100 mm; use a jaw crusher to crush fluorite, quartz sand, and iron scale, and then crush it finely with a wheel mill. The particle size is controlled at 3 mm. Below mm; Chromite is crushed with a ball mill to less than 175 mesh; Chopped fibers of alumina ceramics are chopped to 15 mm. Put basalt, chromite, fluorite, quartz sand and iron scale into the melting furnace and melt at 1550°C. The molten magma flows into the forehearth, and after further clarification and degassing, it becomes a pure molten body. Add alumina ceramic chopped fibers into the melt, stir and homogenize. The homogenized melt is poured into the mold for molding. The molded manhole c...

Embodiment 2

[0039] Embodiment 2: cast stone manhole cover, the cover body is cast by adding 12wt% silicon carbide whiskers after melting 84wt% iron slag and 4wt% chromite.

[0040]The specific preparation method is as follows: crush the iron slag with a jaw crusher to a particle size of 40 mm; use a ball mill to crush the chromite to a size smaller than 175 mesh; put the iron slag and chromite into a melting furnace, °C melting. The molten magma flows into the forehearth, and after further clarification and degassing, it becomes a pure molten body. Add silicon carbide whiskers into the melt, stir and homogenize, and pour the homogenized melt into a mold for molding. The molded manhole cover is subjected to a temperature of 880°C for 20 minutes to precipitate dense and uniform mineral crystals. After the manhole cover is crystallized, send it together with the mold into a microwave annealing furnace, keep the temperature at 820-840°C for 1 hour, then gradually increase the temperature, k...

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Abstract

A cast stone cover of manhole is proportionally prepared from 15 raw materials including stone, slags, glass, flyash lime stone, dolomite, magnesite, etc through mixing, smelting at 1100-1550 deg.C, adding ceramic whiskers and / or fibres, and casting in mould.

Description

technical field [0001] The invention relates to a cast stone inspection shaft 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; Wait. 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 concret...

Claims

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Application Information

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IPC IPC(8): C04B14/04C04B14/22C04B18/08C04B18/14E02D29/14
CPCY02W30/91
Inventor 吕云南
Owner 吕云南
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