The number of inspection piles shall not be less than 1% of the total number, and shall not be less than 3
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The inspection quantity shall not be less than 3 points per unit project, at least 1 point per 100 m2 for projects above 1000 m2, and at least 1 point per 300 m2 for projects above 3000 m2
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of pile mixture shall be checked
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During construction, the thickness of layers, the compaction of overlapping parts during segmented construction, the amount of water added, the number of compaction times and the compaction coefficient must be checked
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There shall be at least one point under each independent foundation and one point every 20 linear meters of foundation trench
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During the construction process, the thickness of layered laying, the overlapping length of upper and lower layers during segmented construction, the amount of water added during compaction, the number of compaction times and the compaction coefficient shall be checked
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The bearing capacity of engineering piles shall be tested
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5、 Sand and gravel foundation: medium sand, coarse sand, gravel sand, gravel (Pebble) and stone chips should be used as raw materials
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2、 For lime soil foundation, sand and gravel foundation, geosynthetics foundation, fly ash foundation, dynamic compaction foundation, grouting foundation and preloading foundation, the results (foundation strength or bearing capacity) after completion must meet the standards required by the design
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In recent years, quality accidents of basic engineering or damage accidents of adjacent buildings and public facilities caused by unknown geological data or insufficient attention to adjacent buildings and facilities have occurred frequently
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9、 Cast in place pile: the pile top elevation shall be at least 0.5m higher than the design elevation, and every 50m shall be poured ³ There must be one group of test pieces, less than 50m ³ Each pile must have 1 set of test pieces
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If necessary, construction survey and investigation shall be carried out to ensure the project quality and the safety of adjacent buildings
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Reliable protection measures shall be taken for horizontal control piles and leveling control points, and re survey and inspection shall be carried out regularly
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The leveled site surface shall be inspected point by point
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During earthwork construction, the plane position, horizontal elevation and slope gradient shall be measured and checked frequently
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Geosynthetics shall be 100 ㎡ in a batch, and 5% of each batch shall be sampled
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6、 Geosynthetics Foundation: before construction, the physical properties (mass, thickness and specific gravity per unit area), strength, elongation, soil, sand and gravel of geosynthetics shall be inspected
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Fine sand shall be mixed with 25% – 35% crushed stone or pebble at the same time
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Earthwork shall not be stacked on the slope of foundation pit
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4、 Lime soil foundation: lime soil material, lime or cement (when cement replaces lime in lime soil) and other materials and mix proportion shall meet the design requirements, and lime soil shall be mixed evenly
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The filling thickness, water content control, compaction degree, filling thickness and compaction times of each layer shall be determined according to the soil quality, compaction coefficient and machines and tools used
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If there are no design requirements, the slope in the direction of drainage ditch shall not be less than 2 “
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If filling is carried out on cultivation or loose soil, it shall be carried out after the base is compacted
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During construction, check the lifting speed of the machine head, the amount of cement slurry or cement injection, and the length and elevation of the mixing pile
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7、 Cement soil mixing pile foundation: before construction, check the quality of cement and admixture, pile position, working performance of mixer and integrity of various measuring equipment (mainly cement slurry flowmeter and other measuring devices)
12、 Important works or supporting structures are part of the main structure; The excavation depth is greater than 10cm; The foundation pit with the distance from adjacent buildings and important facilities within the excavation depth is class I foundation pit| Information source network intrusion and deletion | Review of previous periods ● recruitment and job search 𞓜 free release entrance: Test and test recruitment and job search release ● can the labor dispatch personnel sign the inspection and test report? ● latest registration management policies! Must see Click
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11、 Earthwork backfilling: before backfilling, the garbage, tree roots and other sundries of the base shall be removed, the pit ponding and sludge shall be removed, and the base elevation shall be accepted
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After construction, the pile strength, pile diameter and foundation bearing capacity shall be checked
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After construction, the pile top elevation, pile position, pile mass, foundation bearing capacity and the quality of cushion layer shall be checked
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Click the blue word, pay attention to us, and more free services are waiting for you! 1、 Before the construction of foundation works, complete geological survey data and the structure of pipelines, buildings, structures and other public facilities near the project must be available
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3、 For cement soil mixing composite foundation, high-pressure jet grouting pile composite foundation, sand pile foundation, vibroflotation pile composite foundation, soil and lime soil compaction pile composite foundation, cement fly ash gravel pile composite foundation and compacted cement soil pile composite foundation, the total number of bearing capacity inspection is 1.5% – 1%, but not less than 3
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During the filling construction, the drainage measures shall be checked
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8、 Cement fly ash gravel pile composite foundation: during construction, the mix proportion, slump, lifting drill pipe speed (or casing speed), hole forming depth, mixture pouring amount, etc
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10、 Site leveling: the surface slope shall meet the design requirements
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During the construction, the foundation cleaning, the laying thickness and flatness of backfill, the laying direction of geosynthetics, the overlapping length or joint condition of joints, and the connection between geosynthetics and structures shall be checked
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One inspection point shall be taken for every 100-400 m2, but not less than 10 points; The length, width and slope shall be 1 point every 20m, and each side shall not be less than 1 point
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When the total number of piles is not less than 50, it shall not be less than 2
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