Polyethylene plastic (commonly known as HDPE) geotechnical materials mainly rely on high molecular materials and polymers as raw materials. It can be made into various products and placed inside, on the surface or in the middle of different kinds of sand to fully exert the functions of lifting or protecting the sand. It has excellent resistance to most clothing, food, housing and industrial-grade chemicals, and features high application temperature, strength, structural mechanical compressive strength and drug resistance. 2mm thick geomembrane is generally used in garbage treatment plants, and the raw materials are mainly determined by urban construction standards. However, how to calculate the price of 2mm thick HDPE geomembrane at present? According to urban construction standards, 2mm geomembrane is 22.8 yuan. The national standard for 2mm geomembrane is 18.3 yuan. The thickness of the geomembrane can be customized from 0.3mm to 3mm. The actual price of the thickness can be actually controlled.
The bottom of a water conservancy hub reservoir generally adopts an HDPE geomembrane waterproof layer. The bottom is basically divided into a foundation pit excavation area and a backfill soil area. Among them, the height-to-width ratio of the backfill soil is 70m. There are many connection positions between the geotextile and structures such as toe boards, water intake and drainage outlets, and traffic Bridges. According to the specific circumstances of the project, A summary has been made from the aspects of the construction process of geomembrane engineering, construction methods, safety and quality management. For everyone's reference and emulation.
The rational saving of clay used for temporary covering in landfill storage to a large extent leads to the waste of landfill storage. The standards for landfill work stipulate that the work within the module should be carried out by layer-by-layer compaction. The thickness of each layer of the landfill should be 2.5 to 3.0 meters. After each layer of waste is compacted, it must be filled with 15 to 30 centimeters of soil. If work is carried out in accordance with the said standards, 5% to 10% of the warehouse will be wasted. Furthermore, infrastructure investment has been enhanced. 0.5mmHDPE film is used as the temporary covering material. Generally, the surface covering is carried out after the waste is leveled and compacted. The overlapping parts of the film reinforcement can be welded by electric welding or sandbag sealing. When the estimated temporary covering time is long or there is a lot of rain, it is strongly recommended to use the double-track electric welding method for film connection. In areas where daily necessities are covered, it is suggested that sandbags be used to press the seams. When the organic compound content in the waste increases sharply or when it is rainy and muddy, a certain amount of clay covering measures can be appropriately increased to fully ensure the reliability of the garbage pit and the safety factor of the operation. Generally speaking, compared with clay, HDPE film as a covering material can reasonably save about 8% of landfill storage.
Laying of HDPE geomembrane
During the laying process, all factors should be prevented from damaging the geomembrane. The methods and mechanical equipment used for laying should be adopted as little as possible to avoid damaging the geomembrane or the underlying muscle base. Hard-soled shoes and running shoes are prohibited during construction. Smoking is also forbidden at the construction site. The hdpe geomembrane board should be laid stably and firmly, with as few wrinkles as possible. After laying, it should be immediately anchored to the bottom of the cabin or with steel bars. Choose the laying direction reasonably and try to avoid the support plates at the joints. The layout of each piece of raw material should be reasonable to minimize the number of interfaces. When there is strong wind, rainy days or geographical conditions that are not conducive to the arc welding operation process, laying should not be carried out. After the geotextile membrane strips are arranged, arc welding should be carried out immediately to reduce the probability of problems caused by thermal expansion and contraction or problems related to average temperature (such as wind damage).
At the site of the embankment slope protection and the bottom of the channel (pool), the laying team members first check whether the number of each membrane within the laying area is the same as that in the floor plan design (membrane laying drawing). After confirming the accuracy, they promptly identify the membrane locations that meet the requirements. After laying and inspecting one piece of geomembrane, the next piece of geomembrane should be overlapped on top of the previous one at a height of more than 10cm. The overlapping specification should be based on the surface marks of the geomembrane as a reference. When moving and adjusting the geomembrane, use a pressure wrench. After the geomembrane is adjusted and straightened, temporary steel bar anchoring should be carried out as much as possible (usually with soil bags or sandbags) to prevent the raw materials from slipping or moving. The amount of geomembrane laid should not exceed the amount of arc welding that can be carried out in one working day. When laying the film at different parts, such as the foot of the slope protection, the bend, and the intersection of the slope mouth, the soil base should be smooth when turning and no negative slope should occur. When laying the geomembrane, try to release the pressure as much as possible to prevent the membrane from tilting.
The most suitable temperature for laying geomembrane is between 5℃ and 35℃. It is not recommended to carry out geomembrane construction in rainy weather. If it is extremely necessary, construction can be carried out during thunderstorms (with a total precipitation value of 0 to 10mm within 24 hours). Before the construction of buildings, try to remove the precipitation from the geomembrane as much as possible. The geomembrane strips of the waterproof layer should be arranged vertically along the slope, rather than advancing along the slope. The reasonable layout of the banner should not have the seams at the horizontal and horizontal positions on the slope. During the process of laying composite geomembrane, relevant records should be filled out carefully as required.
General regulations for the welding of HDPE geomembrane:
There are mainly two types of HDPE geomembrane welding: double-track welding and extrusion type welding. Among them, double-track welding is suitable for large-scale HDPE geomembrane welding. Extrusion type welding is suitable for restoration and improvement areas. When laying geomembrane, the number of welds should be minimized as much as possible, and there should be no cross-line welding seams. Under the necessary condition of ensuring quality, raw materials should be saved as much as possible. The total width of the lap joint of the composite geomembrane reinforcement should take into account the tensile strength and air tightness test requirements of the welding. Generally, it is advisable to be able to accommodate the automatic running behavior of the automatic double-track MIG welding machine, that is, 8cm to 10cm. Average? The vertical plane of the welding arrangement direction should be perpendicular to the line with a very large slope, so as to weld the vertical support plate. In the absence of special requirements, horizontal welding is not allowed.
Generally, in corners and abnormal areas, the length of the interface should be shortened as much as possible. Except as specified, no welding is required within 1.5 meters of the top of the interval or the stress area. After the hdpe geomembrane is laid, wrinkles that may cause human error should be avoided. When laying in winter, it should be as tight and smooth as possible. When laying in summer, try to release the pressure as much as possible to take into account the thermal expansion and contraction characteristics of the raw materials. After the geotextile membrane is laid, walking and transporting tools on it should be minimized as much as possible. Any objects that may have adverse effects on the geomembrane must not be placed on it to prevent accidental damage to the geomembrane. Reinforcement anchor trench: The specifications and models of reinforcement anchor trenches are generally 0.5m to 1.0m in width and 0.5m to 1.0m in depth. The foundation pit time for reinforcement anchor trenches should not be too early to avoid the collapse of slope protection debris and stones, which may break the geomembrane. Reinforcement anchoring is divided into temporary reinforcement anchoring and backfill soil. Temporary steel bar anchoring is classified into several types, including trench excavation steel bar anchoring, nail and bullet steel bar anchoring, and expansion screw steel bar anchoring. According to the actual needs of the construction project, the specific method to be adopted will be discussed with the scheme designer and the on-site registered surveyor.
标题：Price of hdpe geomembrane 地址：http://http://www.pebaohu.cn//content/?329.html
相关内容推荐：
相关评论：
