How should the foundation of a spherical tank be constructed

Thank you so much, but this is just a partial one. Could you send more? Or send it to my email rwang@live.cn. Thank you

5. Main construction techniques 5.1 Civil engineering construction plan 5.1.1 Equipment foundations A. Construction sequence: Site marking and layout → Foundation treatment → Trench excavation → Trench cleaning → C10 concrete cushion layer → Reinforcement for the ring beam → Formwork installation for the ring beam → Concrete pouring for the ring beam → Concrete pouring for the supports → Concrete curing → Foundation inspection B. Construction methods: a. Construction surveying: Verify the coordinate system provided by the client and establish a local coordinate system; after verification, protect it with C15 concrete along with rebar cages. Measure individual structures using the local coordinate system, and once verification is successful, proceed to the next stage of work. Using the received coordinate network, foundation control piles are determined based on the planar positions of buildings and structures; these control piles must be properly protected to prevent any displacement. b Earthwork excavation: The earthwork is excavated using a WY-100 type backhoe; in the event of larger stones, mechanical methods are employed to remove them. The excess soil is transported to the designated location using dump trucks, followed by manual cleaning of the trench and grading of the slopes. For wellpoint dewatering, according to the technical specifications provided in the tender documents, lightweight wellpoints will be used for dewatering in this project. The wellpoint pipes are made of steel tubes with a diameter of Ф45mm and a length of 6m; each pipe is equipped with a filter tube at its lower end as well as a tip ； The main pipe is constructed using Ф100mm steel pipes connected in sections, with joint fittings for the connecting well pipes installed every 1.5 meters ； Pumping equipment: 4 submersible pumps, 1 vacuum pump; the number of centrifugal pumps and air-water separators will be determined based on the actual conditions on site. The layout of the well points is determined by the size of the foundation pit’s plan, the properties of the soil, the direction of groundwater flow, and the required depth of water level reduction. When the width of the foundation pit is less than 6m, a single row of linear dewatering wells is used ； When the foundation pit involves large-scale excavation, ring wellpoint dewatering is used. The distance between the wellpoint pipes and the foundation pit should not be less than 1 m to prevent localized air leakage ； Around the area where excavation has taken place, adjacent to the main drainage pipe, backfilling must be carried out in accordance with the relevant specifications before the wellpoint drainage equipment can be removed. The holes left by the wellpoint pipes should be filled promptly with coarse sand. The installation of the wellpoint pipes can be carried out by using water pressure to push them downward; the diameter of the holes used for installing these pipes is 300 mm, and the drilling depth should be about 0.5 m deeper than that of the filter pipes, with strict adherence to verticality. When burying the pipes, the space between the well point pipes and the hole walls should be promptly filled with coarse sand to prevent fine sand from blocking the holes in the filter pipes; filling is considered successful if the water level inside the pipes rises simultaneously. Within a depth of 0.5 m from the ground surface, it should be tightly filled with clay to prevent air leakage. After the well point pipes are installed, they can be connected to the main pipeline and the pumping system to conduct a test pump operation, in order to check for any leaks of water or air, to ensure that the water flow is normal, and to verify that the well point pipes are not clogged. If any abnormalities are detected, repairs must be carried out before the system can be used again. If the foundation is buried at a shallow depth, excavation is carried out to dig dewatering wells, after which the water in these wells is pumped out using submersible pumps to reduce the water level, thereby ensuring the proper progress of the foundation construction. C. For the Sanqi lime-soil cushion, the lime soil used must be screened, with particle sizes not exceeding 5 mm; the slaked lime should not contain any unslaked lime lumps. It is necessary to mix it evenly, applying it in layers with a thickness of 250 mm each. After compaction, the compactness coefficient and minimum dry unit weight of the lime soil must meet the design requirements. D. Reinforcement work: The rebars are prefabricated in a centralized manner and then tied in place at the construction site ； Mechanical processing is used for straightening, cutting, bending, and other operations on steel bars ； Reinforcement connections are made using single-sided lap welding, with a weld length of 10d ； The welding locations are uniformly planned in accordance with design and specification requirements. The cover thickness of rebar is controlled by mortar spacers, while the spacing between the rebar bars in adjacent layers is controlled by steel shims ； The reinforcement in the inner and outer pool walls is connected using reinforcement hooks. E. Plain soil cushion: The fill material must be clean, free of any impurities. The moisture content of the fill should be around 15% (on a weight basis). It should be filled in layers, with each layer having a thickness of no more than 250 mm. After compaction, the compaction coefficient and minimum dry unit weight must meet the design requirements. F. Quality requirements: a The allowable deviation for the elevation of the base center line is ±20mm ； b The height difference between any two points within an arc length of 10m on the base surface shall not exceed 6mm, and the height difference between any two points along the entire circumference of the ring beam shall not exceed 12mm. 5.1.2 Construction measures for equipment foundations A. Earthwork excavation: The excavation machinery is determined based on the size of the equipment foundation; for large foundations, mechanical excavation is used along with manual cleaning of the bottom area, while for smaller foundations, manual excavation is employed. The excavated soil is transported to a location designated by Party A for temporary storage, and then brought back when backfilling is carried out. The excavation of the foundation pit is carried out with slopes determined based on the soil conditions, and the working surface has a width of 300 mm. Excavate to the designed elevation, grade the slopes and clean the bottom, without disturbing the soil layer at the base. If it is not possible to slope the foundation pit and its walls cannot be kept stable, support structures must be added to ensure the safety of the workers. B. Rebar work: Rebar must come with a product quality certificate, and it can only be used after passing tests ； ； The bent rebar should be shaped within one plane with the correct angle ； The prepared rebar is sorted by usage location and stacked with labels attached ； The label indicates the part of the body it is for, specifications, etc. Reinforcement inspection: Since reinforcement work falls under the category of concealed works, inspections should be carried out before concrete pouring or before formwork is set up (in areas where the reinforcement may be covered by the formwork), with proper records kept. C. Formwork work: Composite steel formwork is primarily used; for areas where the modulus does not suffice or for irregular shapes, wooden formwork is fabricated and assembled. The support system consists of φ48 steel pipe scaffolding poles. When setting up and installing the template, the following rules must be followed: The accessories must be fixed firmly. The support surfaces under the pillar uprights and diagonal bracing should be leveled and compacted, with shims added. D. Bolt fixation technical measures: To ensure the smooth lifting of the equipment, the location and elevation of the embedded bolts are an important aspect of the equipment foundation construction. For ring-mounted anchor bolts, ring-shaped steel plates with a width of 100mm to 200mm and a thickness of 10mm are used as fixing rings; holes are drilled according to the geometric dimensions specified in the drawings, caps are installed at the top and bottom, and angle iron is used for support and fixation to ensure the correct position of the anchor bolts.

Isn’t it just the same as laying the foundation for equipment? But first, you need to know how to read blueprints.

Be sure to use a grid to ensure even distribution of stress.

From design and civil engineering foundations to installation, how long is the commissioning period?/