Processing and customizing various FRP rainwater wells, sewage wells, valve wells, gas wells
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Fiberglass manhole is a new generation of manhole product replacing concrete manhole. Fiberglass inspection wells and fiberglass pipes are supporting products for various commercial and residential construction projects. The mobilization of red bricks and bulk cement is not environmentally friendly and laborious. Fiberglass inspection wells have complete specifications and models, which can be customized according to user needs. Detailed introduction: FRP manhole is a new generation of manhole product replacing concrete manhole. Fiberglass inspection wells and fiberglass pipes are supporting products for various commercial and residential construction projects. The mobilization of red bricks and bulk cement is not environmentally friendly and laborious. Fiberglass inspection wells have complete specifications and models, which can be customized according to user needs. Round well: diameter DN500, DN600, DN700, DN800, DN1000, DN1200, DN1400, DN1600, DN2000 and other square wells: ■ 500, ■ 600, ■ 700, ■ 800, ■ 1000, ■ 1200 and other [connection method] sockets are connected with rubber rings, which are common with PVC and double wall corrugated pipe interfaces, and can be used as starting wells, two-way wells, three-way wells, four-way wells, mud sinking wells, drop wells, etc. The opening is flexible, the connection is convenient, and the opening can be made on site, It can also be customized according to customer requirements. [Comparison between fiberglass manhole and traditional concrete manhole] The fiberglass manhole has the following characteristics: [Good corrosion resistance] The fiberglass manhole can resist the erosion of acid, alkali, salt, seawater, untreated sewage, corrosive soil or groundwater and many chemical fluids. The service life of the well chamber is longer than that of the traditional well chamber, and its design service life can reach more than 30 years. As for the FRP well chamber, it is widely welcomed by the municipal drainage industry because of its advantages such as no need for corrosion protection, long service life, simple installation, etc. [Anti fouling and anti moth] The surface of unsaturated polyester resin in the fiberglass well room is clean and smooth, and will not be contaminated by shellfish, fungi and other microorganisms in the sewage, thus increasing the roughness and maintenance costs. [Good heat resistance and frost resistance] It still has good toughness and extremely high strength at - 30 ℃, and can be used for a long time in the range of - 50 ℃ - 80 ℃. The resin with special formula can also work at a temperature above 110 ℃. [Light deadweight, high strength, convenient transportation and installation] The fiberglass reinforced plastic well chamber produced by filament winding has a specific gravity of 1.8 － 2.0, but its strength can reach 50-120Mpa, so that it can be designed to meet various requirements for internal and external pressure and axial force according to different requirements of users. The socket and spigot connection between the utility model and the piping makes the installation quick and convenient, reduces the hoisting cost, and improves the installation speed. [Low maintenance cost] Due to the above corrosion resistance, frost resistance, pollution resistance and other properties, the project does not need anti-corrosion measures and maintenance, which can save a lot of project maintenance costs. [Strong adaptability] FRP well chamber can be designed and manufactured into well chamber structures of different specifications and grades according to various specific requirements of users, such as different pressures, different burial depths and load conditions, to meet the actual needs of the project. The disadvantage of concrete manhole chamber is that [poor corrosion resistance] in corrosive areas such as saline alkali areas, coastal areas or some non strong corrosion areas, corrosion is prone to cause structural failure accidents. According to the survey, if the concrete well chamber is installed in an environment with heavy corrosive sewage, it will be corroded and perforated in about one year, and scrapped in three months. [Self weight, complex construction] The concrete well chamber wall is generally thick and has large self weight, so it requires high foundation bearing capacity. For soft soil foundation, silt, marsh and other special areas, the use of concrete well chamber must be made of artificial foundation to improve the foundation bearing capacity, which increases the project cost. [Poor compactness, prone to leakage accidents] For areas with high groundwater level, due to the poor waterstop performance of traditional materials, sewage often seeps into the shaft wall and into the groundwater system, causing environmental pollution around. Especially in the northern region, frost heaving damage often occurs in concrete well chambers in cold winter, which seriously affects the normal and safe operation of municipal drainage projects. [Poor adaptability, poor designability] Most of the concrete well chambers are of outer diameter series. For some installation conditions with high burial depth, there may be insufficient strength. Due to the defects of the material itself, targeted design cannot be carried out to meet the needs of the project. [Pit and foundation] a. The pit and pipe trench shall be excavated at the same time. During excavation, the main line of the well seat shall be on the same axis as the pipeline in the pipe trench, and over excavation is not allowed. b. Drainage and water level lowering measures shall be taken in areas with high groundwater level or during construction in rainy season. c. The foundation of inspection well shall be calculated and determined according to the local geological survey data and the pulling force of backfill. [Connecting pipe installation] a. The installation sequence of the connection between the inspection well seat and the pipeline shall start from the upstream section of the household connection pipe, install in the sequence of well pipe well pipe, and gradually extend to the downstream branch pipe and main pipe. b. The construction method for connection of well seat joint and pipeline shall be consistent with that for connection of pipeline with the same type of joint. c. The connection between the well seat and the inlet pipe and the outlet pipe needs to be reduced. When reducing joints are used, when the diameter of the inlet pipe is smaller than the diameter of the well seat joint, the pipe top shall be connected flat; When the discharge pipe joint of the well seat is larger than the downstream pipe, the inner bottom of the pipe shall be butt jointed. [Shaft installation] The length of the shaft shall be the height from the bottom of the socket connecting the shaft seat to the design ground, minus the clear distance from the top of the shaft to the ground. When it is difficult to accurately determine the ground or pavement elevation, the shaft length can be properly reserved. [Backfilling] a. Backfilling shall be carried out after the drainage pipeline (pipeline and inspection well) is accepted and at the same time as the backfilling of pipeline trench. Pour and reinforce. d. Sludge, garbage and frozen soil shall not be used as backfill, and hard block objects with edges and corners such as stones and bricks shall not be included. e. When the depth of local larger frozen soil is greater than or equal to 1.0m, within the frozen layer, medium coarse sand shall be backfilled at least 100mm around the shaft. f. Backfilling shall be carried out manually in layers, with the density consistent with that of pipeline backfilling, without displacement and inclination of the shaft, and mechanical backfilling is strictly prohibited. [Maintenance and repair of glass fiber reinforced plastic manhole] a. Professional dredging machinery should be used for hydraulic cleaning of pipelines. b. The sludge and sand in the rainwater inspection well should be cleaned by mechanical suction tools. For manual cleaning, special tools shall be used. c. To check the sludge condition of the pipeline, the inspector shall be used for visual inspection, and it is not allowed to go into the well for detection
