Technology of construction and production of reinforced concrete piles with CFA technology
The CFA method is used for unstable terrain, it is very effective for loose and unconsolidated materials. The execution technology itself is efficient and fast, because all operations take place continuously, without interruption.
The application of CFA technology requires the involvement of special machinery such as MAIT HR 180. The machines have special tools with "endless drill".
The terrain prepared in this way enables the movement and proper operation of the engaged machinery and equipment, proper centering, leveling and better work performance.
It is necessary to adjust the working plateau so that the mechanization can move backwards and perform the previously mentioned operations.
It is recommended to bring the working plateau at the level of the top of the anchor, in order to lower the reinforcement baskets to the concrete mass, and also to leave the part prescribed for tightening the pile head. Also, the working plateau prepared in this way enables the movement of machinery, without distorting the armature anchors.
Before the start of work, the machine system itself is connected to the auto-pump. After connecting the system, it is necessary to pump cemet milk through the auto-pump systems and the machine system. Cement milk is made from 3 bags of cement and water.
The self-pump must have all the information about the dimensions of the concrete injection piston as well as the remote adjustment of concrete pumping speeds, it is definitely recommended that the self-pump has its own concrete flow measurement system All data on the car pump should be provided for compliance. It is not recommended to change car pumps due to constant data correction and adjustment of concrete flow.
Before concreting, a sample is taken from the auto-mixer and poured using an Abrams cone. The required pouring of concrete should be from 56cm to 60cm.
Before the end of concreting, the reinforcement basket must be ready and assembled completely, due to the length of the reinforcement basket, it must be welded one hundred percent and fixed, so that the basket does not bend or fall apart during lifting.
It is certainly allowed to reinforce the pile up to 2/3 due to the very moments it receives, the reinforcement basket in this case accepts the forces of pressure and transfer to the concrete that can meet the projected load.
When drilling CFA piles, since it belongs to DRILLED piles, there is no effect on the bearing capacity of the pile if the pit is broken again. The advantage of CFA piles compared to conventionally drilled piles is that when injecting concrete through the machine system, concrete is compacted into the pile sheath and thus increases its load-bearing capacity, while with conventionally drilled piles the load-bearing capacity of the pile is not as high. which only fits evenly with the wrapper.
Depending on the characteristics of the terrain, it is sometimes necessary to drill the pile to a certain level in order to make it easier later for concreting, which must be done without interference and difficult work.
Method of execution of "CFA" secant piles is:
The folding of the reinforced and non-reinforced pile is 5.0 cm on both sides. The grade of reinforced pile concrete should be less than the grade of reinforced pile concrete. For reinforced concrete piles (mostly) take MB30 , while for non-reinforced piles take MB20 or MB25 . It is enough for the unreinforced piles to be 1.0 m deeper than the excavation level.
Thank you for visiting our website. You can contact us by e-mail and we will do our best to answer you as soon as possible. You can also contact us by phone or follow us on a social network.
Bulevar Zorana Đinđića 89
Beograd, Srbija 11000
office@gmtim.rs
+381 11 618 36 49