What are the common building foundation acceptance criteria?

Friends who have come into contact with the building are no strangers to the foundation. As the saying goes: A good foundation is the beginning of success. This sentence is fulfilled in construction. We all know that building a house is very important. Only when the foundation is laid, the house can be built down step by step. The standards for acceptance of building foundations have been established, and certain standards have been adopted for better implementation. People engaged in the construction industry and foundation engineering can go to the construction according to the requirements of the code. Do not endeavor to save time and eventually lead to bad consequences. Today, I came to explain the relevant content of foundation acceptance criteria for the majority of my friends.

Foundation design level

The foundation design grade is based on the degree of foundation complexity, building size and functional characteristics, and the extent to which foundation damage may cause building damage or affect normal use. Foundation design is divided into three design levels. Design should be based on specific conditions. level. There are three design levels: A, C, and C.

  

Foundation foundation construction specification

Before construction, it is necessary to have complete geological survey data and the construction of pipelines, buildings, structures, and other public facilities in the vicinity of the project. If necessary, construction surveys and investigations shall be conducted to ensure the project quality and the safety of adjacent buildings.

The construction unit must have corresponding professional qualifications and should establish a perfect quality management system and quality inspection system. The units engaged in foundation-based engineering inspections and witness tests must have qualification certificates issued by the construction administrative departments at or above the provincial level (including provinces, autonomous regions, and municipalities directly under the Central Government) and measurement certification certificates issued by the metrological administrative authorities. Foundation engineering is a divisional project. If necessary, according to the current national standard “Unified Standard for Construction Quality Acceptance of Buildings” GB50300, several subdivision projects may be further divided.

In case of abnormal construction process, the construction shall be stopped. The supervision or construction unit shall organize relevant units such as surveying, designing and construction to jointly analyze the situation, solve the problems, eliminate the hidden dangers of quality, and shall form documentary materials.

For ash foundation, sand and gravel foundation, geosynthetics foundation, fly ash foundation, dynamic foundation, grouting foundation and pre-pressed foundation, the results after completion (foundation strength or bearing capacity) must meet the design requirements. standard. The number of inspections shall not be less than 3 points per unit of work. For projects of 1000m2 or more, there shall be at least 1 point for every 100m2, and for engineering above 3000m2, there shall be at least 1 point for every 300m2. There should be at least 1 point for each independent foundation, and 1 point for every 20 linear meters of groove.

Composite composite foundation for cement-concrete mixed piles, composite foundation with high-pressure jet grouting piles, sand pile foundation, composite foundation with vibro-acoustic piles, composite foundation with soil and lime-soil compaction piles, composite foundation with cement fly-ash crushed stone piles, and compacted cement-soil pile composite The test of the bearing capacity of the foundation is 0.5% to 1% of the total, but not less than 3. When there is a single-pile strength test, the quantity is 0.5% to 1% of the total, but not less than 3.

  

Foundation acceptance specification

The construction unit should have professional qualifications and should establish a sound quality management system and quality inspection system. The units engaged in foundation and basic engineering inspections and witness tests must have qualification certificates issued by the administrative departments of construction of provinces (or municipalities directly under the Central Government) or above (including provinces, municipalities directly under the Central Government) and metrology certification certificates issued by metrological administrative authorities.

Composite composite foundation for cement-concrete mixed piles, composite foundation with high-pressure jet grouting piles, sand pile foundation, composite foundation with vibro-acoustic piles, composite foundation with soil and lime-soil compaction piles, composite foundation with cement fly-ash crushed stone piles, and compacted cement-soil pile composite The foundation should be inspected for the quality of the piles, the number of which is 2% of the total but not less than 10. The bearing capacity of the piles should be examined in 0.5%-1% of the total, but not less than 3.

Engineering piles should be tested for vertical bearing capacity. For pile foundations with Class A foundation design or complex geological conditions and low pile reliability, the static load test method should be used for inspection. The number of inspection piles should not be less than 1% of the total, and not less than 3.

The order and method of earth excavation in the foundation pit project must be consistent with the design conditions, and follow the principle of “grooving support, digging first, digging after excavation, layer excavation, prohibiting over-excavation”. The foundation pit and pipe trench earthwork acceptance must be based on the premise of ensuring the safety of the supporting structure and the safety of the surrounding environment. When the design has indicators, it must be based on the design requirements. Environmental protection has increasingly attracted the attention of the society. Improper construction of foundation pits has caused the occurrence of cases of house settlement, pipeline cracking, and ground cracks. The purpose of this article is also to draw up fishing from the requirements of environmental protection.

Editor's summary: The above is the relevant foundation knowledge of building foundation acceptance specification. Hope to help friends who have this requirement! For more information, please continue to pay attention to our website, follow-up will show more exciting content.

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