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Technology
Dynamic development of the construction industry in Russia and an infill construction in major cities require the use of new high-tech methods in the field of underground construction works.
Technologies
Building a foundation begins with the geotechnological studies of the object. Although the construction of drilled piles is possible under any hydrological and geological conditions, there are some specific aspects in any particular case.
Design and cost calculation: drilled piles are designed for various constructions taking into account an impact of the welding pressure, drilled pile depth in primary rock and distance between each pile axis in a row. Besides, while designing drilled piles, the following should be checked: plane shifts towards the batice and the rock mass in weaker layers as well as the risk of a vertical shift.
The hole of a required diameter is drilled by the rotary drilling unit. The drilling continues until the required length of a casing is reached. After that, the casing is placed into the hole. Then the next section of the hole is drilled and another section of a casing is built up and placed into the hole.
Reinforcement cage is made and placed into the hole. Depending on the load, it is installed along the whole pile or partially at the upper end of the pile to link with the pile grating.
In case if soil is unstable, casing is placed into the hole that ensures the safety of piling operations and high quality of concrete casting. To underpin hole walls the construction of drilled piles can be carried out in casing remaining in the soil.
A hole with casing is filled up with concrete with a vertically moving pipe. The concrete mass is then compressed with a trembler fixed on the pipe. While the hole is being filled up with concrete, the casing is gradually removed.
Also, it is possible to use the slurry wall technology. Different trenches and excavations could be made using this technology; all of them have barriers made of prefabricated reinforced concrete or mix-in-situ concrete. This construction protects the inner core and the bottom. Thus, it is possible to build metro/subway tunnels, retention basins, foundations, underground garages, and pedestrian subways.
Raidex company constructs drilled piles with diameter of 620 – 2,500 mm which may be up to 90 meters deep depending on the soil type and the parameters of external load.
Design and cost calculation: drilled piles are designed for various constructions taking into account an impact of the welding pressure, drilled pile depth in primary rock and distance between each pile axis in a row. Besides, while designing drilled piles, the following should be checked: plane shifts towards the batice and the rock mass in weaker layers as well as the risk of a vertical shift.
The hole of a required diameter is drilled by the rotary drilling unit. The drilling continues until the required length of a casing is reached. After that, the casing is placed into the hole. Then the next section of the hole is drilled and another section of a casing is built up and placed into the hole.
Reinforcement cage is made and placed into the hole. Depending on the load, it is installed along the whole pile or partially at the upper end of the pile to link with the pile grating.
In case if soil is unstable, casing is placed into the hole that ensures the safety of piling operations and high quality of concrete casting. To underpin hole walls the construction of drilled piles can be carried out in casing remaining in the soil.
A hole with casing is filled up with concrete with a vertically moving pipe. The concrete mass is then compressed with a trembler fixed on the pipe. While the hole is being filled up with concrete, the casing is gradually removed.
Also, it is possible to use the slurry wall technology. Different trenches and excavations could be made using this technology; all of them have barriers made of prefabricated reinforced concrete or mix-in-situ concrete. This construction protects the inner core and the bottom. Thus, it is possible to build metro/subway tunnels, retention basins, foundations, underground garages, and pedestrian subways.
Raidex company constructs drilled piles with diameter of 620 – 2,500 mm which may be up to 90 meters deep depending on the soil type and the parameters of external load.
Technology advantages
1. Safety and comfort. In the pile drilling there is no dynamic impact on neighboring buildings and soils. Due to a minimum level of noise, the construction work can be carried out even at night time without causing any discomfort to local residents. During the installation process, secant piles do not cause any vibrations, thus this technology can be used in close proximity to other buildings. Also, the shunt enclosure of an excavation is characterized by no vibration during the installation process and a high bearing capacity.
2. Convenience and economy. Drilled piles are made of cast-in-situ concrete directly on the building site. This type of concrete has a remunerative price and it is more available than a precast product. Consequently, there is no downtime and the process does not depend on concrete product plant performance.
3. Reliability and effectiveness. Drilled piles have a higher bearing capacity than the driven piles. Each drilled pile endures a load of up to 400 tons, including up to 15 tons per running meter.
4. Universality. This technology allows an installation of a pile with a design bearing capacity for all types of soils (sand, rock, and gravel-cobble sediments).
5. Efficiency. A relatively small size of equipment and its mobility make it possible to use as many pile drilling units as possible. This affects neither the price of the product nor its high quality, which remain the same.
2. Convenience and economy. Drilled piles are made of cast-in-situ concrete directly on the building site. This type of concrete has a remunerative price and it is more available than a precast product. Consequently, there is no downtime and the process does not depend on concrete product plant performance.
3. Reliability and effectiveness. Drilled piles have a higher bearing capacity than the driven piles. Each drilled pile endures a load of up to 400 tons, including up to 15 tons per running meter.
4. Universality. This technology allows an installation of a pile with a design bearing capacity for all types of soils (sand, rock, and gravel-cobble sediments).
5. Efficiency. A relatively small size of equipment and its mobility make it possible to use as many pile drilling units as possible. This affects neither the price of the product nor its high quality, which remain the same.