Expansion joints have always been the main link in the maintenance of pipeline and valve fittings. The self plays a key effect in pipeline. The expansion joint should be moved out of the temporary water point basically at 600 meters of deep foundation pit and set up water reservoirs, washing stations, ash ponds, concrete mixing stations and other drinking water sources and water equipment at locations beyond 1200 meters of deep foundation pit. Expansion joint when the trench excavation exceeds 200-300mm above the building elevation, the excavation of the pit may be carried out, in the concrete pouring will first excavate the concrete pad.
After the expansion joint is dug out of the trench, the foundation mat should be padded or a reasonable sealing method should be chosen to avoid the roadbed from drying out and cracking, leaving a hidden danger more obvious than soaking. Once the capital construction infiltration in a floor, mortar should be immediately dug out of the infiltration site, and underground waterproofing project filled with non-wide raw materials, such as non-soft soil, lime soil, stone, sand drainage pipe data information, soil mix and other non-expansive raw materials on the premise and the same relative height. Expansion joint in the construction process of the slope protection project, to get a good retaining wall, slope protection column, flood control ditch, drainage pipe drainage ditch and other work to avoid the imbalance of the slope protection, to avoid the expansion of the house to close and collapse.
Expansion joint in the case of suspicious circumstances, when the basement floor is located in the swelling soil layer above the thin thickness, can be used to remove and replace the following soft soil of the floor or choose the countermeasures of the cast-in-place plate. After the plant, sand, gravel, fine stone can be used as the foundation bedding layer. Bedding layer thickness can be based on soft soil thickness, expansion coefficient and total expansion rate clear. Foundation bedding thin thickness generally should not be less than 300mm, gravel foundation bedding total width should exceed the total width of the foundation bedding. The backfill in the room can be mixed with lime powder or moderate plus moisture content.
If the pipeline connection is in this condition, it will cause the pipeline to rupture, which will endanger the transportation of this medium. The flange limit expansion joint can compensate for the expansion and contraction of the pipeline caused by the temperature difference, which has a good regulating effect. The flange limit expansion joint can be axially expanded and contracted within a certain scope, and can also overcome the deviation caused by the different axial connection of the pipeline within a certain perspective, which can greatly facilitate the installation and disassembly of the valve and pipeline, and can be expanded and contracted at will in the allowable expansion amount of the pipeline, and has a limit once the larger expansion amount is turned over to ensure the operation of the pipeline.
