Foundation pit support is a measure to support, reinforce and protect the side wall and surrounding environment of foundation pit to ensure the safety of underground structure construction and surrounding environment of foundation pit.
Zhong Da consulted Bianxiao Company to sort out relevant information, and the monitoring contents of foundation pit slope include:
The monitoring object of foundation pit support is the envelope itself and the surrounding buildings and structures. The layout range of monitoring points to be adopted in construction is the influence area of foundation pit slope excavation, which is slightly more than twice the depth of foundation pit, and the specific conditions of monitoring objects (importance, distance, structure, foundation form, etc.) are also considered. ) is taken into account. Around the slope of the foundation pit and at the external corner of the foundation pit, a settlement and displacement monitoring point is set every 20 ~ 25m. In order to distinguish the process and responsibility of pavement damage after the completion of the project, it is necessary to conduct a detailed investigation on the current situation of the pavement before the project officially starts, and take photos, describe and file the current situation of the pavement (materials, flatness, surface characteristics, damage and cracking) for the convenience of future comparative analysis and regular follow-up inspection. If there is a big change, it will be timely.
Related expansion of foundation pit slope monitoring;
Problems needing attention in foundation pit engineering investigation
1, survey scope: the survey points are arranged outside the excavation boundary 1~2 times the excavation depth, and the survey scope should be expanded for soft soil.
2. Exploration depth: It should be determined according to the design requirements of foundation pit supporting structure, which should not be less than 2.5~3.0 times of the excavation depth, and the soft soil area should pass through the soft soil layer. In case of stable moderately weathered or slightly weathered rock, the drilling depth can be appropriately reduced, and the drilling depth to moderately weathered rock should not be less than 3m, or slightly weathered rock depth should not be less than1m..
3. Exploration point spacing: it should be determined according to geological conditions and can be selected within the range of 15~30m. When the formation changes greatly, more exploration points should be added.
4. Groundwater: water level and its change; Dynamic change law of groundwater.
5. Geotechnical performance indicators: conventional physical and mechanical performance indicators and shear strength indicators.
6. The surrounding environment includes the distribution and performance of buildings (structures), roads and pipelines within 3 times the excavation depth outside the excavation boundary.
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