Large-scale terrestrial power stations, including complementary fishery and light, and complementary agriculture and light projects, are a very important part of the preliminary work process. The project feasibility study needs to be based on the geological survey report to build the civil construction of the project. Feasibility and plan.
The geological survey report is usually issued by the team with the qualification of engineering survey after on-site operation, and generally the relevant teams of the national land department are responsible.
The geological survey report provides detailed geotechnical engineering data and geotechnical parameters required for the design, geotechnical engineering analysis and evaluation of the construction foundation, and demonstrations and recommendations for basic design, foundation treatment, and prevention of adverse geological effects. Include the following:
1. Collect relevant information on the nature, scale, structural characteristics, basic forms, depth of burial of the proposed buildings;
2. Identify the types, causes, distribution scope, development trends and damage degree of adverse geologic functions in the site, and propose proposals for evaluation and remediation;
3. Identify the types, structures, and engineering characteristics of each soil layer within the building, and the vertical and horizontal vertical thickness distribution of each soil layer, identify the physical and mechanical properties of each soil layer, and analyze and evaluate the stability and uniformity of the foundation. And bearing capacity;
4. Divide the site soil types and site categories to evaluate site and seismic effects;
5. Identify the groundwater burial conditions, type of groundwater, replenishment and discharge conditions, groundwater level and its extent of change, and determine the corrosiveness of environmental water and soil to steel, concrete and steel structures;
6. Comprehensive geotechnical geotechnical conditions, demonstration and analysis of the foundation design plan, proposed economic and reasonable design proposal; provide geotechnical engineering parameters required for the design requirements, and put forward reasonable suggestions for the design and construction problems.
Specific to photovoltaic power plants, mainly for the following:
1. Evaluate the structural stability and suitability of the area where the photovoltaic power plant is located, and whether there are any trends such as settlement or collapse within the area;
2. Perform on-site geological prospecting and analysis of PV array field inverter room and comprehensive building, and provide engineering geological survey achievement documentation to determine the type and construction characteristics of the building foundation;
3. Identify the hydrogeological conditions of the project site, propose the quality report of underground/surface water, and determine whether the underground/surface water is corrosive to the photovoltaic power station foundation and supports and other damaging effects. In particular, whether there is a need to carry out special anti-corrosion measures for the foundations on the ground where the fishery and the light complement each other and the complementary agricultural and light projects.
4. Conduct surveys of natural building materials;
5. Conduct investigations on construction and domestic water sources;
6. Participate in the pit excavation and the relevant foundation treatment and demonstration work after the excavation of each building in the construction phase;
At present, the five most commonly used Thermosetting Plastics in various fields are PU, epoxy resin (EP), silicone, unsaturated polyester (UP) and phenolic resin (PF).
Thermosetting Plastic has the following advantages:
Thermosetting plastic has a large rigidity and is extremely elastic and plastic deformation.The temperature has little influence on stiffness, and under the same load and temperature, the creep variable is much smaller than thermoplastic.Good heat resistance;The plastic parts are quite stable when heated.The size of the plastic parts is good. Thermosetting plastic is less affected by temperature and humidity, and Thermosetting plastic can be reduced after forming, making Thermosetting plastic easy to make plastic parts with high precision than thermoplastic ruler.Excellent electrical performance.Resistance to arc and voltage, etc.Good corrosion resistance, weak acid, weak base and organic solvents;Good processability, can be processed by various molding methods and other advantages.
Most thermosetting plastics have the following characteristics:
(1) excellent chemical resistance.
(2) it is usually brittle hard plastic, which can be filled with various fillers to form composite materials.
(3) compared with thermoplastic resin, the molding cycle is longer.
(4) all kinds of modification can be carried out, depending on the combination of resin, crosslinking agent, additive, etc., which can form composite materials with different properties.
(5) good heat resistance, the use of high temperature, Tg of thermosetting polyimide (PI) is about 350 ℃.
(6) can be used as raw materials to meet the application of various fields.Only 5% is used as injection molding material.
(7) the waste is generally used as filler after pulverization, which is difficult to recycle and pollutes the environment.
Due to the high heat resistance of thermosetting plastic, good dimensional stability, good line performance, anti-aging properties are better than thermoplastic plastic and low price, so it is widely used.The disadvantage is that the mechanical properties are poor and need to be enhanced.
It is mainly composed of thermosetting resins, which are involved in various necessary additives to form the plastic of the products.In the process of manufacturing or forming, the liquid will be liquid, which will not melt after curing or melt or soften again.Common thermosetting plastics include phenolic plastic, epoxy plastic, amino plastic, unsaturated polyester, alkyd plastics, etc.Thermosetting plastic and thermoplastic plastics constitute two major components of synthetic plastic.
Thermosetting plastic heating for the first time can soften the flow, heated to a certain temperature, react a crosslinking reaction and curing hardens, this change is irreversible, since then, heating again, already no longer soft flow.It is the use of this characteristic to make the molding process, using the plasticization flow of the initial heating, filling the cavity under pressure, and solidifying to become the product that determines the shape and size.
Thermosetting plastic is distinguished by a chemical reaction that is hardened by heating, pressing or adding the hardener at a definite temperature.After hardening, plastic chemical structure changes, the texture is hard, dissolves in the solvent, heating also no longer softens, if the temperature is too high then decompose.In thermoplastic plastic, the chains of resin molecules are linear or branched, and there is not any chemical bond between the molecular chains, which soften the flow when heated.The process of cooling and hardening is a physical change.
Formaldehyde cross linked plastic includes phenolic plastic, amino plastic (such as urea-formaldehyde - melamine - formaldehyde, etc.).Other cross linked types of plastic include unsaturated polyester, epoxy resin, prevalence, diallyl ester resin, etc.
The commonly used thermosetting plastics are phenolic resin, urea-formaldehyde resin, melamine resin, unsaturated polyester resin, epoxy resin, silicone resin, polyurethane, etc.
Production:Phenolic resin PF (Bakelite sheet)
Phenolic resin is a part of the longest plastic varieties in history, commonly known as bakelite or electric wood, and the appearance is yellowish or black, which is the typical representative of thermosetting plastic.Bakelite sheet molding often use a variety of filling materials, according to different filling materials used, the product performance is also different, Bakelite sheet as molding material, mainly used in the field of need heat resistance, but also as a bonding agent used in plywood, grinding wheel and the brake pads.
Thermosetting Plastics
Thermosetting Plastic,Thermoset Molding Plastic,Mould Thermosetting Plastic,Thermoplastic Type Plastic
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