RU2462557C1 - Pile - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention may be used in foundations, perceiving considerable vertical and horizontal loads (for instance, building foundations in seismic areas). To increase its bearing capacity, a pile comprises combined vertical augered shaft and inclined needle shafts, having reinforcement frames, at the same time inclined shafts in the amount of at least four are rigidly connected with their upper ends with the lower end of the vertical shaft and are directed along diagonals of the rectangular longitudinal section of the vertical shaft. Reinforcement frames of inclined shafts are brought for the length of anchoring into a vertical shaft.

EFFECT: pile has higher resistance and has higher bearing capacity for vertical and horizontal load.

1 cl, 2 dwg

Description

The invention relates to the field of construction and can be used in foundations that accept significant vertical and horizontal loads (for example, the foundations of buildings in seismic areas).

There is a known construction consisting of a central pile expanding downward and four inclined piles expanding downward, pairwise arranged in perpendicular planes and connected by their upper ends to a central pile in its middle part (USSR author's certificate No. 1788150, class E02D 29/02, 1990). A disadvantage of the known design is the relatively low bearing capacity for vertical load, which, due to the increasing cross section of the piles, is determined only by the area of their lower ends.

A known design, including four intersecting inclined downward expanding piles, pairwise located in perpendicular planes and united in the zone of intersection by a reinforced concrete belt (USSR author's certificate No. 1673698, class E02D 29/02, 31/08, 1989). The disadvantages of the known design include a relatively low bearing capacity for vertical load, which is determined only by the area of the lower ends of the piles. The disadvantage of this design is also the relatively low bearing capacity for horizontal load, under the action of which the piles will be subjected to destructive loads from bending moments occurring in the belt.

Closest to the proposed technical essence is a pile, including a vertical bored barrel reinforced with reinforcing cages and two inclined bore-injection shafts located on opposite sides of the vertical shaft (patent for invention No. 2303103, class E02D 5/46, 2005). The disadvantage of such piles is the low bearing capacity for horizontal load acting perpendicular to the plane of inclined shafts.

The technical solution to the problem is to increase the load-bearing capacity of piles and reduce material consumption.

This object is achieved in that in a pile, including the combined vertical bored shaft and inclined bore injection tubes having reinforcing cages, according to the invention, inclined trunks in an amount of at least four are rigidly connected with their upper ends to the lower end of the vertical shaft, while the inclined trunks are directed diagonally a rectangular longitudinal section of a vertical trunk, and the reinforcing cages of the inclined shafts are inserted along the length of the anchoring into the vertical trunk.

As a result, a pile is formed having increased stability and greater bearing capacity for vertical and horizontal loads.

The novelty of the proposed piles lies in the fact that the inclined borehole injection shafts, buried in dense soils, due to the quantity increase the total lateral surface of the pile, providing a large bearing capacity for vertical load. Under the action of horizontal loads, the inclined shafts prevent horizontal displacement of the lower end of the vertical trunk of large diameter, which, having great bending stiffness, together with the soil, resisting horizontal loads, provides a large bearing capacity for horizontal load.

The angle of inclination of inclined trunks, their length, diameter and quantity is determined on the basis of the necessary bearing capacity of the piles depending on the characteristics of the soil surrounding the trunks, as well as technological requirements.

The length of the vertical trunk is determined based on the current loads and the characteristics of the soil surrounding the trunk, as well as technological requirements.

The invention is illustrated in the drawing, where:

figure 1 shows a General view of the piles in section;

figure 2 shows a top view.

The pile includes a vertical bored shaft 1 with a reinforcing cage 2, inclined borehole shafts 3 having a reinforcing cage 4. The inclined borehole shafts 3 are rigidly connected with their upper ends to the lower end of the vertical shaft 1 and directed along the diagonals of a rectangular longitudinal section of the vertical shaft. Reinforcing cages of 4 inclined trunks are inserted to the length of the anchoring in the vertical trunk.

A pile is arranged as follows.

Perform well drilling for a vertical bored hole 1.

Perform drilling for inclined borehole shafts 3.

Reinforcing frames of 4 inclined shafts are lowered.

After installing the reinforcing cage 2 of the vertical shaft, concrete is supplied.

Claims (1)

Pile, including the combined vertical bored and inclined borehole injection trunks having reinforcing cages, characterized in that the inclined boredoinjection trunks in an amount of at least four are rigidly connected with their upper ends to the lower end of the vertical trunk, while the inclined trunks are directed along the diagonals of a rectangular longitudinal section of the vertical trunk moreover, the reinforcing cages of the inclined trunks are inserted along the length of the anchoring into the vertical trunk.

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