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 f

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] The method for preparing the cast stone manhole cover of the present invention may include the following steps: material preparation, batching, melting, adding reinforcing materials, forming, crystallization and annealing, sorting, and surface enhancement.

[0017] 1. Material preparation

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

[0019] 2. Ingredients

[0020] After the raw materials are processed to the standard, the ingredients can be carried out. Commonly used methods of ingredients include "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 base material, fin...

Example Embodiment

[0036] Example 1: Cast stone manhole cover, the cover body is made of 75wt% basalt, 4wt% chromite, 2wt% fluorite, 6wt% quartz sand, 1wt% iron scale after melting, adding 12wt% alumina ceramic chopped fiber and casting Become.

[0037] The specific preparation method is as follows: the basalt is crushed to a particle size of 100 mm with a jaw crusher; the fluorite, quartz sand, and iron scales are coarsely crushed by a jaw crusher and then finely crushed by a wheel mill, and the particle size is controlled at 3 Millimeters or less; chromite ore is crushed to less than 175 mesh with a ball mill; alumina ceramic chopped fiber is cut to 15 mm. Put basalt, chromite, fluorite, quartz sand, and iron scale into the melting furnace and melt it at 1550°C. The molten magma flows into the forehearth, and after further clarification and degassing, it becomes a pure melt. Add alumina ceramic chopped fiber into the melt, stir and homogenize. The homogenized melt is poured into the mold for formi...

Example Embodiment

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

[0040]The specific preparation method is as follows: use a jaw crusher to crush the iron slag to a particle size of 40 mm; use a ball mill for chromite ore to pulverize to less than 175 mesh; put the iron slag and chromite into the melting furnace, ℃ melting. The molten magma flows into the forehearth, and after further clarification and degassing, it becomes a pure melt. The silicon carbide whiskers are added to the melt, stirred and homogenized, and the homogenized melt is poured into a mold for forming. After forming the manhole cover, it takes 20 minutes to precipitate dense and uniform mineral crystals at a temperature of 880°C. After the manhole cover is crystallized, it is sent to the microwave annealing furnace together with the mold. It is kept at a constant temperature of 820-840°C for 1 hour, and then gradually heated ...

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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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