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. Rockwell hardness tester is the world's first designed based on the principle of rockwell hardness test, need only unilateral contact sample can test the hardness of the metal rockwell hardness tester, rockwell hardness tester measuring depend on magnetic head adsorption on the steel surface, don't need to support of sample, test precision up to the standard GB/T230, ISO6508, no less than desktop rockwell hardness tester. The Rockwell hardness test was first developed by Americans S.P. rockwell and H.M. Rockwell in 1914. In 1919 and 1921, they improved the design of rockwell hardness tester twice, which established the prototype of modern Rockwell hardness tester. In 1930, Wilson (C.H Wilson) updated the design, so that rockwell Hardness Testing methods and equipment more perfect. Our country has produced touch screen control and numerical display as well as curve display and automatic printing test data rockwell hardness tester. Rockwell hardness testing method is characterized by simple operation, rapid measurement, and can be read directly from dial indicator or optical projection screen or display screen. Along with Brinell and Vickers hardness testing, it has become one of the three most commonly used hardness testing methods Rockwell Hardness Tester,Digital Rockwell Hardness Tester,Rockwell Hardness Test Scale,Rockwell C Hardness Tester TROJAN (Suzhou) Technology Co., Ltd. , https://www.trojanmaterials.com