Tianjin Settlement Plate Roadbed Settlement Plate Specification and Model Full

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　　Tianjin Settlement Plate Roadbed Settlement Plate Specification and Model Full

　　After the holiday, the market price of settlement plate steel achieved a "good start". Recently, there have been frequent positive news, with steel prices rising after the holiday and the combined impact of the Spring Festival holiday. Many steel mills have implemented maintenance and production cuts, and the market has high expectations for future infrastructure investment. But we also need to see that the expansion of the manufacturing industry is slowing down, the real estate market is still sluggish, and the resumption of construction work and demand recovery still have a process to go. In the short term, due to the lack of real demand, the market's upward trend is mainly driven by emotional factors, and many merchants still need to pay attention to risk prevention and control.

　　Standard for Observation of Roadbed Settlement Plates:

　　1. The adopted standard 1.1 "Code for Construction of Railway Roadbeds" (TB10202-2002). 1.2 "Code for Engineering Surveying" (GB50026-93). 2. Setting of settlement observation sections 2.1 Principles of section setting: For soft soil subgrade sections, settlement and displacement observation systems should be installed to monitor surface deformation during filling and post construction settlement of embankments. During and after the construction of soft soil subgrade, continuous settlement displacement observation should be carried out to control the filling rate, ensure the stability of the embankment during construction, and determine whether the post construction settlement meets the requirements based on the settlement observation results. The main contents of observation include: settlement of soft foundation, lateral displacement of soil, and the rate of settlement change of soft foundation after the embankment is filled to the maximum height.

　　4 Construction and usage principle of settlement plate. Composed of steel plate, measuring rod, and protective sleeve. The size of the base plate can be customized according to customer requirements. The measuring rod and the base plate are fixed in a vertical position, and the protective sleeve is made of steel pipe sleeve. The sleeve size is suitable to cover the measuring rod and allow the ruler to enter the measuring head. As the filling height increases, the measuring rod and sleeve are also correspondingly raised, with each section not exceeding 55cm in length. After raising, the top surface of the measuring rod should be slightly higher than the upper opening of the sleeve. When not measuring, seal the upper opening of the casing with a cap to prevent the filler from falling into the pipe and affecting the sinking of the measuring rod.

　　Before installation, the roadbed surface must be compacted, and the installation position must be measured. Once the position is fixed, the bottom elevation of the slab should be measured immediately, and this value should be recorded as the initial value.

　　After filling the height beyond 20cm of the observation rod mouth, compact the entire section, and then extend the measuring rod and protective sleeve of the settlement plate. The extension method can be threaded connection or welding connection (measuring rod welding, protective sleeve connection with adhesive tape). After connection, immediately measure the elevation and calculate the actual connection length.

　　(1) Dig a soil pit of about 500, 500, and 500mm at the burial site, and level and compact the pit with 30-50mm thick yellow sand.

　　(2) Place the settlement plate flat in the pit, fill the surrounding area with yellow sand and calibrate the level with a level, and then backfill the soil to level and compact it.

　　(3) When filling, the filling should be compacted around the settlement plate first to protect the settlement. The protective sleeve should be buried 30cm away from the bottom plate.

　　(4) After the previous layer of filling material is compacted, excavate the filling material to the protective sleeve at the pre embedded position, open the pipe plug to measure the elevation of the pipe head, and the difference between the two elevations is the settlement between observations. Then connect the previous section of connecting pipe and protective sleeve, measure the elevation of the pipe head, install the pipe plug, backfill and compact, and so on. The height of the pipe head with a good pipe plug should be 3-5cm lower than the formed filling surface.

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