In the equipment renovation and reconstruction project, the existing station site is in good condition, and the subgrade surface stress can reach the requirement of 15MPa of allowable stress, and it is not necessary to excavate the roadbed. Shovel the road base to the design elevation and directly cast the concrete monorail bed on it. If the condition of the roadbed is not good enough to meet the design requirements, the roadbed needs to be reprocessed. The roadbed fills elastic deformation and compaction (sinking) under the dynamic load of the train, the foundation of the track equipment and the weight of the fill. Excessive elastic deformation and compaction deformation will affect the safety of the train. The size of the elastic deformation and compaction of the subgrade depends mainly on the compaction density of the fill. Density must meet design requirements without unanticipated sinking and disease. The 0.sm under the subgrade is more affected by the dynamics, and the foundation of the reducer slurry masonry is just at this depth, so the scheme for excavating the subgrade must be cautious. Even if the design requires the replacement of the Sanqi soil and the reserve of 30-somm is reserved, sometimes large settlement will occur, and even if the reducer is installed and not opened, settlement will occur. In severe cases, the nut of the rail fastening fastener is too thick to be fully screwed into the bolt, which is very dangerous and endangers driving safety. In the past, most of the designers of the reducer installation were mechanical engineers. The understanding of the subgrade was not comprehensive enough. There was no quantitative requirement for the Sanqi soil.
Make necessary improvements to the overall track bed structure. The stress and use of the concrete monolithic bed is discussed above. The following three suggestions for improvement are proposed for the structure: 4 rails in the integrated track bed are eliminated, and longitudinal and transverse bars are reasonably arranged to improve safety. Because the overall track bed of the reducer is more severe than the concrete sleeper on the normal line. It is subjected to the momentary impact load generated by the retarder braking. This load is much larger than the normal load of the following vehicles. Considering the development direction of high-speed and heavy-duty railways in the future, the axle load of trucks will increase by a large margin. In order to ensure the necessary safety of the concrete track bed, the required bearing capacity of the lower rail section and the intermediate deck surface are respectively increased. The maximum average positive bending moment of the lower section of the rail and the maximum positive and negative bending moment of the middle section can be referred to the relevant parameters of the concrete sleeper panel.
Sulfate, a compound consisting of sulfate ions (SO42 -) and other metal ions, are electrolytes and most of them are soluble in water.
Sulphate mineral is a kind of salt which is composed of metal element cation (including ammonium) and sulfate.
With high quality and first-Class service, we have successfully win the trust of customers all over the world, both small companies and big enterprice, and we shall continue the high quality products provided and improve our service to get the Win-win result.
Sodium Bisulfite,Sodium Bisulfite Solution,Sodium Bisulfite Anhydrous,Industrial Grade Sodium Bisulfite
Shijiazhuang Xinlongwei Chemical Co., Ltd. , https://www.xinlongwei-chem.com