Aseismic pile

FIELD: construction.

SUBSTANCE: aseismic pile comprises a cylindrical fabricated structure made of reinforced concrete placed into a sand concrete hollow reinforced cylinder, on the bottom of which there is granite sand, with a layer of around one metre. The space between the reinforced cylindrical structure and the sand concrete reinforced cylinder is filled with sand for the height of the hollow cylinder.

EFFECT: invention provides for foundation reliability, reinforcement, preventing building damage in case of considerable earth oscillations under seismically dangerous conditions, lower material intensity.

1 dwg

 

The present invention relates to the field of construction, in particular to devices used to strengthen the Foundation of buildings and structures, to prevent their destruction, in seismically hazardous regions.

Known for bored pile, made of concrete and metal, which is obtained by drilling a well to a considerable depth to bedrock (1-2).

The disadvantage of this pile is its small footprint, and in consequence, it is not a reliable building with tremors, since the displacements at the base of the buildings having the reaction, able to destroy the pile and pull out from the base.

In addition, this type of piles requires special expenses as in their manufacture uses a significant amount of concrete and metal.

Known floating pile representing a design in the form of poccoobraznuu frame using metal wedges, not fortified at a certain depth, which is like a "floating support" of the building, which takes the pressure holds the Foundation, preventing its destruction (3-4).

Production and installation of this design is a costly and complicated installation procedure takes a significant amount of metal required for of the otopleniya metal frame in the form of wedges.

With tremors use of floating piles does not exclude the possibility of the "extraction"as such constructions are never fixed, therefore, in its form and characteristics of these settings may not be a reliable means of strengthening the Foundation of the building.

The task of the invention is to strengthen the Foundation of high-rise buildings, public buildings, large volume and low-rise constructions complex objects for military purposes, using the proposed design will prevent the destruction of buildings even when significant fluctuations of the earth in seismically dangerous areas.

The problem is solved by creating seismic piles, consisting of reinforced concrete structures installed on a sand cushion.

Seismic pile shown in the drawing, where the positions indicated:

1 - reinforced concrete cylindrical structure;

2 - well;

3 - peskobetonnuyu reinforced hollow cylinder;

4 - granite sand.

Seismic pile consists of a reinforced concrete cylindrical structure (1), installed in peskobetonnuyu reinforced hollow cylinder (3), the bottom of which is filled granite sand (4).

Further, the technology of manufacturing and installation of seismic isolation piles is as follows.

Original is Ino drill hole (2) with a diameter of 1.8 m to 2 m, a depth of 10 to 12 meters of the Bottom and walls of the wells (2) are reinforced knitted armatures in the borehole (2) is installed casing cavity between the drilled bore (2) and casing rough concrete under pressure sand blasting machine sand-cement mass, the thickness of the walls of the borehole by convenience. Casing pipe is removed.

The result is peskobetonnuyu reinforced hollow cylinder (3). At the bottom of the obtained cylinder (3) poured granite sand (GOST 8736-93) (4) the layer height from 800 to 1000 mm (by calculation).

In peskobetonnuyu reinforced hollow cylinder (3) on the educated "sandy" install reinforced concrete cylindrical structure (1) with a gap of 200 mm, made in the factory, made of reinforced concrete with spectability, increasing brand and giprostoymost concrete. Empty cavity (gap) between the received pescarmona reinforced hollow cylinder (3) and the reinforced concrete structure (1) are filled granite sand (GOST 8736-93) (4) to the height of the hollow cylinder.

The proposed seismic pile helps to strengthen the Foundation to prevent the destruction of buildings even when significant fluctuations of the earth in seismically hazardous conditions.

Sand is an ideal material that gives the zero draft of the building. In the case of a tremor due to the special structure of seismic isolation is Vai and properties of granite sand, which has a compression strength of more than 40 MPa, frost resistance (up to F200), permeability (up to W-4), resistance to abrasion and aggressive environments, the proposed design will act as a giant shock absorber, the earth's vibrations will put out the Foundation of the building and the possibility of the damage will be minimized.

The estimated depth at which the drilling piles, designed to cut the piles when push 8-9 points on the Richter scale, from 10÷12 m (at underground impetus there is a high probability cutoff piles installed below).

Installation of seismic isolation piles is to optimally safe depth, which implies significant savings, because there is no need of drilling wells to a greater depth (the base of the cone piles can be increased by calculation to the required diameter).

Application of the proposed seismic piles do not require additional costs, as the maximum level of security of the building is achieved through the use of a much smaller number of piles in comparison with the most commonly used pile.

Application of the proposed seismic piles to strengthen the Foundation of buildings, mostly high-rise, is the most optimal, as in the case of tremor concrete structure will perform kachikatsky the absorber, preventing the destruction of the building and minimizing the devastating effects.

Given the minimum level of costs in the manufacturing and installation, reliability and a clear advantage over other types of piles, the use of this pile in seismically hazardous regions is the most important.

Sources of information

1. SNiP 2.02.03-85 "Pile foundations".

2. SNiP 11-7-81 "Construction in seismic regions". - Part II, chap 7.

3. Handbook on seismic mikroraionirovanii. Ed. Overawe. M.: Nauka, 1988.

4. JV 50-101-2004. "Design and construction of bases and foundations of buildings and structures".

Seismic pile, comprising a cylindrical design, manufactured in the factory and are made of reinforced concrete, placed in peskobetonnuyu reinforced hollow cylinder, the bottom of which is filled granite sand layer about one metre, and the space between the reinforced concrete cylindrical structure and pescarmona reinforced cylinder is filled with sand to a height of the hollow cylinder.



 

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