Bian Xiao sorted out the relevant contents of the static load test of the foundation of construction enterprises through the query of the architectural knowledge column of the encyclopedia website of construction industry. The basic situation is as follows:
Static load test of foundation, which is called static load test of pile foundation in technical terminology of construction industry, is an established method and an undisputed pile foundation detection technology in theory. When determining the ultimate bearing capacity of a single pile, it is the most accurate and reliable detection method at present, and judging whether a dynamic load detection method is mature is based on the relative error of static load test results.
Basic provisions of foundation static load test:
1. The bearing capacity of single pile and the integrity of pile body shall be tested for engineering piles.
2. The measuring instrument shall be verified by the national legal measurement unit every year and issued with a certificate of conformity, and shall be used during the effective inspection period to ensure the accuracy, reliability and traceability of the test data of foundation piles. Before the test, the instruments and equipment shall be tested and debugged.
3. The bearing layer of precast pile in static period is cohesive soil, which should be more than 28 days; Sandy silt and sandy soil should be 14 days, and the cast-in-place pile should be centered on the test pile, with the radius of 1.0 ~ 1.5 times the pile length, and the pile should be stopped for more than 28 days without strong vibration interference.
4. The static load test that provides the basis for design should be loaded to the foundation soil damage (uplift: soil damage at the side of the pile, horizontal test: soil damage at the side of the pile or damage to the pile structure); The maximum load of the static load test of the project acceptance sampling inspection shall not be less than 2.0 times of the design value of the vertical compressive strength, uplift strength and horizontal bearing capacity of a single pile.
5. Sampling quantity: under the same conditions (same geological conditions; The same pile type and specification; With the construction technology; Team, personnel quality and mechanical equipment; The number of test piles shall not be less than 65438 0% of the total number of piles, and shall not be less than 3; The total number of engineering piles shall be less than 50 and not less than 2 (including uplift and leveling).
6. The bearing capacity test of single pile should clearly give the bearing capacity test value of each pile. On this basis, combined with the integrity test results of the whole project, it is concluded whether the ultimate bearing capacity of a single pile in the unit project meets the design requirements under the same conditions.
7. The low strain integrity test shall be conducted before the static load test.
8. Multi-section precast piles with obvious defects in the quality of butt-joint piles, large or small filling coefficient, obvious expansion and contraction diameter and unrepresentative cast-in-place piles should not be used as test piles.
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