Earthquake-proof pile

FIELD: construction.

SUBSTANCE: earthquake-proof pipe comprises a reinforced concrete structure. It comprises a cone-shaped base with a galvanised shell from sheet steel, is placed into a sand-concrete reinforced cylinder with a cone-shaped end, on the bottom of which there is granite sand, with a layer of around one metre. The space between a reinforced concrete pile and side parts of the cone-shaped shell are filled with sand for the height of the hollow cylinder.

EFFECT: provision of a reliable foundation, strengthening of a foundation preventing building damage during significant ground vibrations in 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 are 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, preventing the destruction of the building, even with wide variations of the earth in seismically hazardous conditions.

The problem is solved by creating piles specific structure installed on a sand cushion.

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

1 - reinforced concrete structure with a well-developed cone-shaped base;

2 - cone-shaped casing made of galvanized sheet steel cone on the base of the pile;

3 - well;

4 is a hollow cone-shaped shell;

5 - peskobetonnuyu reinforced hollow cylinder with a conical end;

6 - granite sand.

Beneath the pile consists of a reinforced concrete cylindrical structure and a cone-shaped base (1), the cone-shaped base is performed at the place of installation (in the well) when pouring concrete reinforced cone-shaped shell of sheet steel (2).

Further, the manufacturing technology of earthquake is th piles is her future installation and is as follows.

Original drill hole (3) a depth of 10 to 12 m, to the dense layers of the earth. Mining method assemble and install in the hole (3) a hollow conical shell (4) of smaller diameter, made of metal, and the casing, the space between the bore (3), a hollow conical shell (4) and the casing pipe is filled under pressure with a cement-sandy mass, the casing pipe is pulled out. The result is peskobetonnuyu reinforced hollow cylinder with a conical end (5). At the bottom of the cylinder (5) poured granite sand (6) the layer height from 600 to 1000 mm (by calculation).

On the formed cushion set a cone-shaped shell made of galvanized steel of smaller diameter (2) and casing pipe, reinforced base and barrel design, formed of reinforced concrete cylindrical structure with a conical base (1). Casing pipe is pulled out. The space between the reinforced concrete pile and lateral parts of the cone-shaped shell (4) filled with sand on all height of a flat cylinder.

The proposed design of piles 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 tremor, special thanks its the TSS sand and specific structure, piles, the design will act as a giant shock absorber, the earth's vibrations will put out the Foundation of the building and, accordingly, the possibility of destruction of the building 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 (underground impetus, there is a high probability cutoff piles installed below). Thus, the installation of earthquake piles, be made to optimally secure the depth that involves significant savings, because there is no need of drilling wells to a greater depth - base of the cone piles can be increased by calculation to the required diameter.

Specific design earthquake-resistant shell piles eliminates the possibility of "pulling out" even with significant groundwater fluctuations, design securely fixed at the required depth.

Application of the proposed seismic piles, due to its particular structure, requires no additional cost, 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.

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

Sources of information

1. SNiP 2.02.03-85 "Pile foundations".

2. SNiP II-7-81 "Construction in seismic areas", part II, chap 7.

3. Nazarov, P., Vasutin A.N. "Vector analysis of records of strong earthquakes". // Trim the Institute them. Vouchering - 1983

4. Recommendations for the design, construction and operation of multi-functional high-rise buildings and complexes. Load and impact. - M.: Institute them. Vouchering, 2005.

5. SNiP 2.02.01-83* "Foundations of buildings and structures".

Beneath the pile, comprising a reinforced concrete structure, characterized in that it has a tapered base with galvanized sheet steel covers, placed in peskobetonnuyu reinforced cylinder with a conical end, the bottom of which is filled granite sand layer of about one meter, and the space between the reinforced concrete pile and lateral parts of the cone-shaped shell filled with sand to a height of the hollow cylinder.



 

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