The method of construction of bored piles

 

(57) Abstract:

The invention relates to the field of construction, and in particular to methods of construction of bored piles, the construction in the immediate vicinity of buildings and structures, and can be used in the formation of pile foundations structures for various purposes, in particular in a weak water-saturated soils. The method of construction of bored piles includes drilling a borehole in the soil with subsequent concreting. What's new is that before sinking wells in the ground to create a ground-cement pile, and the sinking of wells drilled piles lead to the body ground-cement piles, at least within its lateral surface, and the ratio of the diameters of drilled and ground-cement piles is 0.4 to 0.8, and the sinking of wells drilled piles are at 2-7 days after the creation of ground-cement piles. The sinking of wells bored piles can be carried out with the depth in the native soil. The technical result consists in increasing the quality and bearing capacity of bored piles constructed to be used as the base, while reducing construction time and the relief of load-bearing structures under construction, and in particular to methods of construction of bored piles, the construction in the immediate vicinity of buildings and structures, and can be used in the formation of pile foundations structures for various purposes, in particular in a weak water-saturated soils.

In cramped urban conditions new construction much more difficult. Foundations and basements of buildings, structures and roads located in the immediate vicinity of the newly constructed object is subject to deformation and destruction. The construction of the piles, in particular bored, weak water-saturated soils can cause them to warp, and thus to reduce their carrying capacity, because when sinking wells for subsequent molding it bored piles, the borehole wall is not sustainable.

There is a method of constructing a ground-cement piles, including the introduction of weak water-saturated soil cement, followed by mixing cement with soil. (See Ya Ya Motuzov and other manufacturing Technology ground-cement piles. - Transport construction, 1977, 10, S. 20-21).

The lack of ground-cement piles is its low bearing capacity.

And the earth with increased strength and weak, before sinking longitudinal cavity injection fixing solution, for example, on the basis of cement, around the longitudinal axis being formed ramming piles, and then in injectisome the dirt area is formed into printed pile (Patent RU 2150549, E 02 D 5/34, 2000). In the case of forming piles in soft soils when the borehole wall is not sustainable, the use of the proposed method to fix the soil in the vicinity of the longitudinal cavity, and then it would pass, but the process injectisome consolidate the soil is not effective enough, because fixing solution penetrates into the ground in an uncontrolled and non-uniform distance from the axis of the injector, with some sections of the borehole walls can generally stay loose, and in addition, the construction of piles, the construction in the immediate vicinity of buildings and structures leads to increased dynamic loads on the foundations and basements of buildings, structures and roads, located in the immediate vicinity of the newly constructed object, which leads to their deformation and destruction.

The closest in technical essence and the achieved result to the invention is SPO is UNT EN 2135691, E 02 D 5/34,1999).

The disadvantages of this method is the low degree of compaction of the borehole walls, which when used in weak water-saturated soils can lead to their collapse, as well as to the "ascent" piles.

The present invention is the creation of the technology of construction works for construction of new facilities in cramped urban conditions.

The problem is solved due to the fact that the method of construction of bored piles, including borehole drilling in the soil with subsequent concreting, according to the invention before sinking wells in the ground to create a ground-cement pile, and the sinking of wells drilled piles lead to the body ground-cement piles, at least within its lateral surface, and the ratio of the diameters of drilled and ground-cement piles of 0.4 to 0.8, and the sinking of wells drilled piles are at 2-7 days after the creation of ground-cement piles. The sinking of wells bored piles can be carried out with the depth in the native soil.

The technical result provided by the present set of essential features is to improve the quality and carrying capacity constructed the existing structures during construction, for example tunnels, by reducing the flow of concrete.

The method is as follows.

In the ground create a ground-cement pile using inkjet technology. In the body of a ground-cement piles erected bored pile by sinking wells with subsequent concreting. Sinking wells are, at least within its lateral surface. The sinking of wells bored piles can be recessed in the native soil at the ratio of diameters of drilled and ground-cement piles 0.4 to 0.8 at 2-7 days after the creation of ground-cement piles, because during this time the strength characteristics of ground-cement piles reach more than 30% of the project. The ratio of the diameters of drilled and ground-cement piles due to the creation of protective ground-cement layer. The start time of drilling a well depends on the quality of the original soil, which creates a ground-cement pile, and physico-chemical properties of the cement slurry used to create a ground-cement piles.

An example of the method

At the construction site to create a ground-cement pile on two-component technology. Monitor nozzles made the type of "pipe and an inner pipe - cement mortar. Erosion of soil is carried out by the jet hardening solution under the protection of the air stream in the process of lifting the monitor through a rotating nozzle. Thus, creating a ground-cement pile height of 15 m and a diameter of 1500 mm On the 6th day in the body of a ground-cement piles form the borehole by drilling auger with a diameter of 630 mm depth in the native soil below ground-cement piles of 1.5 meters. Because the process of hardening ground-cement piles started, the wall forming the well stable and resist external loads, but because the process of hardening ground-cement piles is not completed, the extra effort for sinking wells low. Formed in the well with stable walls of the lower reinforcing frame and then fill it with concrete mix through bitonality pipe. Further, the process of joint solidification ground-cement piles and bored. After 7 days of bored pile, erected in the ground-cement, can be used as a carrier.

Joint ground-cement solidification and bored piles can improve the quality and load bearing capacity of bored piles constructed, including through Depoe bored piles in ground-cement can partially remove the load on bored pile by increasing the bearing capacity of the soil around bored piles.

Thus, the proposed method of construction of bored piles allows you to get a pile of the best quality with high load capacity.

The use of bored piles constructed in the body of a ground-cement as a base, such as a tunnel, can significantly (up to 40%) to reduce the amount of concrete for the construction of load-bearing structures of the newly built facilities and reduce construction time.

1. The method of construction of bored piles, including borehole drilling in the soil with subsequent concreting, characterized in that before the sinking of wells in the ground to create a ground-cement pile, and the sinking of wells drilled piles lead to the body ground-cement piles, at least within its lateral surface, and the ratio of the diameters of drilled and ground-cement piles is 0.4 to 0.8, and the sinking of wells drilled piles are at 2-7 days after the creation of ground-cement piles.

2. The method according to p. 1, characterized in that the sinking of wells drilled piles are deep in the native soil.

 

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