Author: George Lagvilava, Deputy General Director of «GEORGE» LLC
I would like to present this article and share an analysis of the main problems that arise during construction near existing buildings, and possible solutions.
Firstly, this is the disruption of the soil structure during the excavation of pits and trenches near previously constructed foundations. To avoid loosening and loss of bearing capacity of soils, it is important to carefully control the technology of earthworks and prevent violations (over-excavation, use of percussion mechanisms, insufficient insulation in winter).
Secondly, this is the change in the stress state of soils and additional deformations of existing buildings from the external load of new construction. To reduce the negative impact, it is important to accurately calculate the zone of influence and expected settlements, as well as provide for structural protective measures.
Thirdly, the danger is the violation of hydrogeological conditions due to open drainage or deep drainage. Strict control of filtration processes and the use of special protective measures in the form of enclosing structures are necessary.
When driving piles and sheet piles, it is important to take into account the dynamic effects on soils and possible deformations of adjacent buildings. It is advisable to use alternative immersion technologies, as well as start work from the most remote row.
The main causes of building deformations are soil compaction from vibration, extrusion of soil upwards with the formation of voids, loss of bearing capacity due to changes in the stress state, the phenomenon of "negative friction", etc.
To avoid or minimize deformations of existing buildings, I recommend the following:
1. Carefully study the engineering-geological conditions of the site, assess the deformability of soils.
2. If possible, use technologies that are alternative to driving - pressing, injection piles.
3. If driving is inevitable, use sheet piling of smaller cross-section, reduce impact energy, increase hammer weight.
4. Start immersing the sheet piling from the row closest to the existing building.
5. Ensure high-quality sealing of the backfill.
6. Carefully monitor the value of dynamic influences during immersion.
7. Stop work immediately if cracks appear in the existing building.
8. Provide for structural measures to protect the building - strengthening foundations, walls, floors.
9. Ensure geotechnical and construction monitoring at all stages of work.
By following these recommendations and carefully controlling all processes, the risk of building deformations can be minimized and the integrity of structures can be preserved during the immersion of Larsen sheet piling. The main thing is an integrated approach, taking into account all factors and strict adherence to the technology of work. I am sure that my experience will help avoid many mistakes and problems in your practice.
Our team of GEORG ENGINER LLC engineers is ready to provide you with full support for the "zero cycle" construction project, lease the Larsen sheet pile, perform sheet pile driving and extraction. Contact us today 8-495-822-65-16, e-mail: info@larsenbuy.ru