Hydroelectric project inspection method and construction standard

Conch Cement     Fuhuai Stone

Wire construction method:

1. Whether electrical products are qualified products that meet relevant standards.

2, the use of fire-retardant dark pipe laying, wire should not have knots and kinks in the pipe.

3. It is forbidden to directly bury the wires in the plaster layer.

4, "Fire line into the switch, the zero line into the lamp", socket wiring should meet the "left zero right fire ground on the" provisions.

5, air conditioning and high-power electrical appliances should be set up separately (flame-retardant tube processing).

6, power lines, television lines, telephone lines must not be installed in the same pipeline.

7. The switches and sockets are firmly installed and the position is correct. The cover plate is upright, close to the wall, and there is no gap around. After the installation of electrical engineering, electrical power should be provided, lighting test light, switch control and so on. After the completion of the project, the customer shall be provided with wiring drawings showing the wire specifications and directions.

The installation of the pipeline should:

1. The pipelines are arranged reasonably, laid firmly, horizontally and vertically, and the switches and valves are installed neatly, which is flexible and convenient to use.

2. The water supply pipe and its accessories are tightly connected. There is no leakage in the water pressure test, the water flow is smooth, and the water meter operates normally.

3, the drainage pipeline should be unblocked, no obstruction, no leakage, the bottom of the bathtub should be higher than the drain bend, and the floor drain dice should be slightly lower than the ground.

4, sanitary ware is firmly installed, the appearance of smooth and clean.

Fittings for water pipes:

The water supply pipe is hidden in the wall. If the pipe breaks or leaks, the wall must be caesareanized and repaired. To prevent the leakage of pipelines, the solution to this problem is to start with the selection of pipes.

1, copper tube

Copper water pipes have been widely used in developed countries. Europe and the United States have used them for more than 100 years, and they still dominate the water supply system. The copper water pipe is considered to be a kind of "red metal with green face". It has neither the easy corrosion of metal materials nor the easily polluting elements of non-metallic materials. The welding process is safe, reliable and non-toxic. The use of copper as a water supply material can be regarded as a green environmental protection material.

2, stainless steel tube

Stainless steel pipe is also a kind of water supply pipe used by western developed countries. The stainless steel tube is stable in performance, does not rust, does not produce secondary pollution, and ensures the hygiene of water. However, due to the toughness of the stainless steel pipe material, according to the traditional technology, tapping and threading in the construction are difficult, adding a great deal of trouble to the installation, and the price is relatively expensive.

Currently, there is a stainless steel wrapable hose on the market, which solves the problem of difficult installation of stainless steel pipes. This product has been specially heat-treated and can be bent at any angle according to the needs of the construction environment. It can be easily wound and installed quickly and easily.

Since the price of the common stainless steel pipe is relatively expensive, there is also an economical thin-walled stainless steel pipe. The use of thin-walled stainless steel pipe instead of the thick-walled stainless steel pipe saves raw materials. Prices are 40% to 50% cheaper than thick-walled steel pipes.

3, plastic pipe

Because plastic pipes have the advantages of light weight, corrosion resistance, low flow resistance, quick and easy installation, and low construction cost, they have been widely used at home and abroad. However, plastic pipes are not pressure-resistant, heat-resistant, and fire-resistant. When they are burned, toxic gases are generated and they are difficult to use under conditions of high heat, high pressure, and near fire. Its strength, linearity, and temperature conditions in extreme areas all limit its scope of application.

At present, the technology of plastic pipes is continuously updated, and many high-tech products have emerged. Such as cross-linked polyethylene pipe to reduce the material deformation, impact strength, low resistance, high temperature capability, compared with the traditional polyethylene plastic pipe has a major technological breakthrough. In addition UPVC plastic water supply pipe, this new type of pipe material has a high cost performance, and easy processing, has good flame retardant, chemical resistance and easy installation, low overall cost, and its thermal expansion coefficient is larger than the steel pipe Soft connection can solve the problem of thermal expansion and contraction more effectively.

4, composite pipe

Plastic composite pipe is an ordinary galvanized pipe as the outer layer, lined with polyethylene pipe, compounded. Plastic steel pipe combines the advantages of strength, rigidity and plastic pipe corrosion resistance, no pollution, smooth inner wall, small water resistance. Plastic-steel pipes have superior performance-cost ratios and can be directly replaced with ordinary galvanized pipes with the largest domestic consumption, and are one of the pipes that are most easily accepted by ordinary people.

Aluminum-plastic compound pipe aluminum-plastic composite pipe is one of the new pipe materials that the National Construction Committee vigorously promoted to replace galvanized pipe. The new composite pipe is composed of polyethylene (or crosslinked polyethylene) - hot melt adhesive - aluminum - hot melt adhesive - polyethylene (cross-linked polyethylene) five layers, with good mechanical properties, resistance Corrosion performance, anti-aging performance, temperature resistance performance and hygienic performance, service life up to 50 years, is a green building material with environmental awareness.

Ultra-thin stainless steel plastic composite pipe Ultra-thin stainless steel plastic composite pipe uses international food hygiene standards permit 304 (Ocr18Ni9) ultra-thin stainless steel, lined with different temperature materials. It has the advantages of high surface hardness, good overall rigidity, low coefficient of linear expansion and corrosion resistance of plastic pipes, and good thermal insulation performance. The service life is up to 50 years.

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