Substation Civil Engineering Design Guide

This section offers you the design guide related to the civil engineering content in substation feasibility study based on electric professional design.

  1. Modify the value of design earthquake accelerating speed in Section 8.5.2 of feasibility study report as the value of project region seismic oscillation peak accelerating speed.
  2. When the productization of basic wind speed of substation has not been completed, modify the design basic wind speed in Section 8.5.2 of feasibility study report according to design guide 3.
  3. Continued for Item 2, the value of design basic wind speed is calculated by the value of basic wind pressure within 50 years displayed in the fifth column of the attached table, Substation Location Basic Wind Speed Reference Table (Appendix E: construction structure load regulation). The formula is: Basic wind speed = sqrt (1600 × basic wind pressure). If there is no city in the attached table, locate at the nearest city as a substitute.
  4. When the first-layer earth of formation lithology is thicker than 3 m and the subgrade bearing capacity is good enough as shown in Section 3.3, use natural subgrade in Section 8.5.2 of feasibility study report and switch to Item 4. Or else, delete the content of 'natural subgrade, and the subgrade bearing capacity characteristic value...' and 'deal with it according to actual situation when the geological condition is not good'. Add the following content: 'As the first-layer earth is soft with low bearing capacity, add six PHC-600AB110 reducing piles of 6 m under the prefabricated cabins and device foundations. Under the roads within the station region, replace with thick lime and soil for subgrade treatment', and then continue with Item 6. If it is 10 kV switching station, delete 'and device' in the content above.
  5. Continued for Item 4, modify the subgrade bearing capacity characteristic value as that of first-layer earth bearing capacity.
  6. Continued for Item 4, add engineering quantity of PHC-600AB110 reducing pile under the prefabricated cabins and device foundations in the main engineering quantity list of Section 8.5.3, and correspondingly add it under prefabricated cabins and device foundations in online PBOM.
  7. Define the value of 'no impact of underground water' in Section 8.5.2 of feasibility study report according to the value of groundwater depth in Section 3.3. When the value of groundwater depth is larger than 3m, define it as no impact. When the value is less than 3m, define it as with impact of underground water.
  8. Define the value of 'no erosive effect of site earth to concrete and rebar' in Section 8.5.2 of feasibility study report according to whether the groundwater and earth are erosive as described in Section 3.3. The erosive effect consists of no erosive, micro erosive, and medium erosive.