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The geotechnical membrane technology of urban construction?
- The welding construction must be synchronized with the geomembrane one after another. The slope geomembrane is laied from up to down in a whole and cannot be splited joint. The upper left shoulder slope and anchorage capacity, and the lower end to the bottom of the pit left head slope root distance of not less than 1.8m, membrane end alignment with hot wedge welder connection. The slope shoulder is welded with extrusion welding. The seam should try to avoid the corner groove in the corner, and try to minimize the irregular shape. If it can not avoid the corner ditch, you must use a squeeze welding machine welding seam. In the crossed welded seams, it must be used to weld the welding machine welding. The length of welding shall not less than 20cm. Before welding, the welding seam should be trimmed to the exposed welding seam, and then the welding machine can be used to fill up the welding machine with the hand wheel.s
What is the mechanism of vacuum tube coating?
- The mechanism vacuum coating is that the membrane body is evaporated to the surface of the workpiece at a high temperature and crystallizes. Since the air will obstruct the evaporated membrane molecules, making the crystalline rough and dim, crystalline can only be exquisite and glossy under the environment of high vacuum. If the vacuum degree is not high, the crystalline will lose its luster and the adhesion is also very poor. Early vacuum coating which relied on the evaporated items to scatter naturally is of poor adhesion, low efficiency, and poor glossiness. Now intermediate frequency magnetron sputtering target is used. the evaporated molecules of the membrane bombard the target under the effect of an electric field at faster speed and sputter a large number of target atoms. Neutral target atoms (or molecules) is deposited on a substrate and become the film, which solves the problem that some films can not be processed through natural evaporation formation, such as titanize and plate zirconium.s
Is the geomembrane bag made of geomembrane or geotextile?
- The two layers of geomembrane bag are made of geofabric not geomembrane or geotextile, mainly used for the watercourse before the revetment (environment friendly geomembrane bag).s
How to measure the thickness of the paint film?
- The agnetic thickness measurement method can be used to measure the magnetic metal matrix: The thickness of the non magnetic coatings on steel, iron and nickel: Zinc, chromium, paint, electrophoresis, enamel, rubber, powder, enamel, coating, etc.) B. To use the eddy current thickness measuring method and nondestructive measurement of non magnetic metal (such as: Aluminum, copper, stainless steel) on non conductive coating thickness (such as: paint, powder, plastic, rubber, enamel, enamel, coating, etc.)s
What is geocell
- There are dozens of kinds of specifications about the specification of the geocell, it depends on the projects, and there are some requirements for the thickness, height and pitch of weld of the geocell.s
What is the classification of film resistance?
- Thin film resistor is a kind of high precision resistor. Thin film resistor is different from the thick film chip resistor and the latter dominates the market. It is a thin film chip fixed resistor with high accuracy and low temperature coefficient. Thin film resistor is made by evaporating a resistivity material on the surface of an insulting material, and the insulting material of such resistor is generally ceramic substrate. Thin film resistor is made by evaporating a certain resistivity material on the insulating material, and the major categories are: 1. The carbon film resistor is made by depositing crystallize carbon on a ceramic rod framework. Carbon film resistors have low cost. Stable performance. Wide resistance range. It has low temperature coefficient and voltage coefficient, and is the most widely used resistor at present. 2. The metal film resistors. Coating the alloy material on the surface of the ceramic rods framework by vacuum evaporation . Metal film resistors have higher precision, good stability, and low noise and temperature coefficient than carbon film resistors, thus is widely applied in the instrumentation and communications equipment. 3. Metal oxidation film resistors is made by deposited a metallic oxide layer on the insulating rod. Because it itself is an oxide, it is stable at high temperature and thermal shock resistance with strong load capacity. 4. The synthetic membrane resistor is made by coating the conductive composite suspension liquid on the substrate, therefore, it is also called paint film resistor. Due to its grainy structure of the conductive layer, it produces a lot of noises, and has low precision. It is mainly used in the manufacturing of resistors with high pressure and resistance and small resistors.s
Geogrid construction should refer to what norms
- At present, there is no special geogrid reinforced soil construction specifications, can refer to the "road reinforcement soil construction technical specifications" in the provision of the belt with the requirements to do.s
Imported geomembrane imported anti seepage film width.
- Geomembrane is generally six meters wide. it can be up to 8 meters.s
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