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High-strength manhole cover

A high-strength, manhole cover technology, applied in water conservancy projects, artificial islands, underwater structures, etc., can solve the problems of high production cost, overall damage, failure to reach bearing capacity, etc., achieve low production cost, solve easy rupture, The effect of increasing the load capacity

Active Publication Date: 2012-08-15
CHENGDU INFOEASY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the bearing capacity of the simple BMC material is not enough, 30% of the total weight of the manhole cover needs to be added as a load-bearing skeleton; therefore, the production cost is high and the consumption of steel bars is large
Even so, the bearing capacity of the BMC manhole cover equipped with steel bars is only 20T, which is still not up to the 40T bearing capacity of the main road manhole cover stipulated in the national standard GB / T23858-2009 "Manhole Cover Inspection". Therefore, the current non-metal manhole cover can only for secondary roads
In addition, due to the poor combination of steel bars and BMC materials, once the manhole cover is partially damaged, it is easy to cause gradual delamination and peeling of steel bars and BMC materials, resulting in overall damage and scrapping
Although the composite manhole cover saves metal materials compared with the cast iron manhole cover, it plays a certain role in preventing theft of the manhole cover; compared with the reinforced concrete manhole cover, the strength of the external pressure load is improved, but due to the complex structure of the composite manhole cover, it is not only bulky and heavy , Inconvenient to use, and because there is a strong steel bar in the middle of the manhole cover, it cannot completely prevent theft

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Weigh 25kg of p-phenylene unsaturated polyester resin, 5kg of styrene, 5kg of polystyrene, 0.3kg of zinc stearate, 20kg of calcium carbonate, 15kg of alkali-free glass fiber cloth, 0.5kg of calcium hydroxide, and silane coupling agent KH570 0.6kg and 1kg of carbon black, then add them to the mixer in sequence, stir evenly, and prepare qualified SMC molding material according to the conventional method for use. Take the above SMC molding material and fill it into the mold evenly, and cool it after molding and holding. Become the finished manhole cover, wherein the temperature of the upper die is 180-190°C, the temperature of the lower die is 180-190°C, the pressure is 20-25MPa, and the holding time is 25-20 minutes.

Embodiment 2

[0014] Weigh 28kg of p-phenylene unsaturated polyester resin, 7kg of styrene, 7kg of polystyrene, 0.6kg of zinc stearate, 25kg of calcium carbonate, 18kg of alkali-free glass fiber cloth, 0.8kg of calcium hydroxide, and silane coupling agent KH570 0.8kg and 1.5kg of carbon black, then add them into the mixer in sequence, stir evenly, and prepare qualified SMC molding material according to the conventional method for use, take the above SMC molding material and fill it into the mold evenly, after molding and holding pressure Cool to become the finished manhole cover, wherein the temperature of the upper die is 180-190°C, the temperature of the lower die is 180-190°C, the pressure is 20-25MPa, and the holding time is 25-20 minutes.

Embodiment 3

[0016] Weigh 30kg of p-phenylene unsaturated polyester resin, 10kg of styrene, 10kg of polystyrene, 1.0kg of zinc stearate, 30kg of calcium carbonate, 20kg of alkali-free glass fiber cloth, 1.0kg of calcium hydroxide, and silane coupling agent KH570 1.0kg and 2kg of carbon black, then add them into the mixer in sequence, stir evenly, prepare qualified SMC molding material according to the conventional method for use, take the above SMC molding material and fill it into the mold evenly, and cool it after molding and holding Become the finished manhole cover, wherein the temperature of the upper die is 180-190°C, the temperature of the lower die is 180-190°C, the pressure is 20-25MPa, and the holding time is 25-20 minutes.

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PUM

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Abstract

The invention provides a high-strength manhole cover. The manhole cover is characterized by being prepared from the following components in parts by weight: 25 to 30 parts of p-phenyl unsaturated polyester resin, 5 to 10 parts of styrene, 5 to 10 parts of polystyrene, 0.3 to 1.0 part of zinc stearate, 20 to 30 parts of calcium carbonate, 15 to 20 parts of alkali-free glass fiber cloth, 0.5 to 1.0part of calcium hydroxide, 0.6 to 1.0 part of coupling agent and 1 to 2 parts of carbon black. The manhole cover is low in production cost; the load-carrying capacity of the manhole cover can be greatly improved; and the load-carrying capacity can reach over 60 tons, so that the manhole cover can be applied to most pavement environments and solves the problem that the conventional manhole cover is easy to crack in use.

Description

technical field [0001] The invention relates to a non-metal well cover, in particular to a high-strength well cover. Background technique [0002] At present, cellar wells are often made of cast iron manhole covers or reinforced concrete. Cast iron manhole covers have poor impact resistance, are easy to rust, and are easily broken. They are often stolen and sold as scrap iron, which seriously threatens the safety of pedestrians and vehicles. It caused economic losses to the country; and the reinforced concrete manhole cover is not only heavy, poor toughness, but also fragile, low bearing capacity, and short service life. In view of the aforementioned problems, a series of non-metal manhole covers have been developed in large quantities. Most of the non-metal manhole covers are made of short glass fibers and unsaturated polycool resin (BMC for short) as the main raw materials, which are cured by mold hot pressing. Since the bearing capacity of the simple BMC material is not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/18E02D29/14
Inventor 彭国宾刘江
Owner CHENGDU INFOEASY TECH
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