Foundation under column grid

FIELD: construction.

SUBSTANCE: invention relates to the field of construction, particularly to building structures, as well as to the construction of foundations and basements. Foundation under the column grid formed by cruciform foundation slabs and ground base. Cruciform foundation slabs are laid on the concrete base and pivotally interconnected by means of reinforced-concrete inserts. Concrete base rests on the solid underlayer, laid on the surface of cleared and compacted ground base. Perimeter of foundation building footprint is surrounded by the wall in the ground, which is embedded in the ground base to the desired depth.

EFFECT: technical result is to provide the load distribution on the entire surface of the ground base, preservation of existing buildings and structures, reduction of the labour intensity.

2 cl, 3 dwg

 

The present invention relates to the field of construction, and more specifically, to building structures, to structures of bases and foundations.

Currently the Foundation in existing built-up area is not only difficult, but also represents a certain danger in the production of works on adopt pits or at the device pile Foundation because they can be damaged or even destroyed a nearby building, and, unfortunately, such disasters are multiplying.

In addition, in Russia ~70% of the area occupied by permafrost or casinopokergameo soils [1, 2], resulting in the traditional design of foundations with the device excavation or pile driving are palliative solution because the pits and piles are thermal bridges, which can disturb the subgrade.

Known design of Foundation under the column grid [3]. The Foundation is formed by cross-beams and nodes slabs arranged support columns. Thus, on the subgrade is concentrated load, which may cause local congestion and to increase the percentage of reinforcement of the Foundation. It should also be noted most trudozatratnogo in the construction of the foundations of this design.

The closest technicalcommittee to the claimed invention is neselovskyi the shallow foundations [4]. The Foundation is formed by the base plate, a soil base and mounting plate, located under the base plate and beneath the soil base at the optimal depth.

On the base plate are jacks, which are connected to rods and ground anchors embedded in the base plate.

Plate compresses the subgrade with the help of jacks and ground anchors.

However, the proposed system is material-intensive and labour-intensive and cannot be applied in the conditions of permafrost soils, because soil anchors can become thermal bridges.

Thus, in modern conditions there is a need to develop new designs nezaposljena Foundation.

The main problem to be solved by the invention is to increase the degree of mechanization and reduced labor costs at the device nezaposlenih foundations, as well as the safety of existing buildings and structures.

This object is achieved using the proposed design nezaposljena the Foundation under the column grid, which, like the prototype, formed the Foundation slabs and soil base.

Unlike the prototype proposed in nezaposljena Foundation Foundation slab laid on a concrete base and is pivotally connected IU�do a reinforced concrete inserts, while the concrete Foundation is based on solid underlying layer laid on the surface cleared and compacted subgrade, in addition, the perimeter of the construction site is surrounded by a wall in the soil, which is embedded in the subgrade to the required depth.

In addition, neselovskyi Foundation supplemented by piles with heads that are installed under the Foundation under each of the pillars located on the Foundation.

The essence of the invention lies in the fact that, due to the fact that on top of the underlying layer is laid a layer of concrete, thickness of which is determined by the strength calculation, carefully Packed and smoothed the surface of the concrete layer in accordance with the design and placement of grid columns, set cross-shaped base plate formed by two intersecting beams with poluerkerami on the ends of beams.

To prevent Poisson expansion under the total vertical load of the construction site pre-surrounded by a wall in the ground and given enough depth, and the base plate on the surface of the concrete plates are pivotally interconnected by means of reinforced concrete inserts in a single system and then the thickness of the Foundation slab finished floor.

The present invention is illustrated by drawings, where Fig.1 showing� General view nezaposljena the Foundation under the column grid in the plan; Fig.2 is a section along a - A; Fig.3 - shows a section along b-B, which shows a design nezaposljena Foundation, reinforced piles-columns.

The Foundation includes a cross-shaped base plate 1, which hinges 2 (poluerkerami) are connected by rectilinear inserts 3 for a thickness of a cross-shaped base plate 1 and a clean floor 4.

To prevent Poisson expansion of Foundation soil under a vertical load in the preliminary prasowanie basis or under the influence of the operational load on the contour of the Foundation wall is arranged in the ground 5 out of geotextiles (or another material that has good resistance to stretching) in sufficient depth in the subgrade 8 to prevent deformations of foundations and basements of buildings and structures located near the building object.

Cruciform base plate 1 (Fig.2) laid on a solid concrete slab 6, which, in turn, laid on a layer of crushed stone 7, instead of the crushed stone can be used gravel, expanded clay, polystyrene or any other material of sufficient strength with the necessary heat-insulating ability.

A layer of crushed stone 7 laid on the prepared subgrade surface 8.

In cases where the load on neselovskyi Foundation chrismer�, and the subgrade layers 8 are formed weak water-saturated soils or as a layering morosoph soils, neselovskyi the Foundation can be strengthened by piles-racks 9 (Fig.3), which are based on the underlying soil Foundation 10.

As an extra insulation and to reduce the concentration of stresses from vertical loads on piles installed in the end walls 11, and a vertical surface of piles 9 are protected by insulation 12 (sand, foam, polystyrene).

At large thicknesses morosoph ground bases (over 50 meters) in the construction nezaposljena the Foundation of the structure in question and at high vertical loads instead of piles-racks can be used at the beginning of piles, which are currently used in the construction of foundations on permafrost and frozen soils, resulting in the development are not considered.

Work nezaposljena the Foundation under the column grid is as follows.

The subgrade 8 is cleaned from organic matter along the perimeter of the Foundation, arrange vertical separation from the surface at a sufficient depth to prevent Poisson expansion and subsequent operation of constructed facilities, are pressed together by any known method.

N� the surface of the subgrade 8 stacked layer of gravel 7 of sufficient thickness, the value of the layer is determined by the bearing capacity and thermal calculations in the construction of foundations on permafrost and frozen poznatih soils.

Layer of gravel 7 may be replaced by other materials, such as sand, gravel, expanded clay, foam, polystyrene, etc. [5, 6].

In contrast to the known constructions the load from the columns of the spread of individual points, but on the entire area of the base due to the fact that the load from the heel of each column through the underlying layers are distributed on the entire surface of the subgrade 8, and thus the pressure per unit area of the subgrade 8 is significantly reduced.

In the case where the load on the Foundation far exceeds the bearing capacity of the subgrade 8, under the underlying layer of Foundation piles are installed 9, and this creates a statically indeterminate system load will be distributed on the subgrade surface 8 and the end walls 11 of piles 9.

Thus, the development of new designs nezaposljena basement task completed:

- the construction of the Foundation of the proposed design is possible without excavation the that in some instances, dangerous or even impossible;

- the Foundation of the proposed design can be built on different soil foundations, as well�e in terms of the existing built-up area;

- with a slight vertical loads neselovskyi the Foundation of the proposed design can be strengthened by piles and in such performance design enables simultaneous operation of all parts of the Foundation;

- the proposed design nezaposljena Foundation transfers the vertical load on the subgrade uniformly to the entire area of the Foundation base, which greatly reduces the pressure per unit area.

Sources of information

1. N. And. Tsytovich. Mechanics of frozen soils. Book house "Librokom" 2009

2. V. D. Karpov. Bases and foundations on casinopokernews soils, Saint-Petersburg, 2007.

3. V. G. Zalessky. Architecture, p. 52, hell.88.1, M. 1911.

4. Russian Federation patent for the invention №2464381, IPC: E02D 27/01, publ. 27.04.2012, bull. No. 12 - a prototype.

5. S. A. Evtukhov, etc. Construction, calculation and design of lightweight embankment, Saint-Petersburg, GUS, 2009

6. E. P. Madres. Abstract, improving the technology of constructions of road embankments from EPS blocks and foam concrete, Saint-Petersburg, GUS, 2013

1. The Foundation under the column grid formed by a cruciform base plates and soil base, characterized in that the cross-shaped foundations slabs laid on a concrete base and is pivotally connected between a reinforced concrete inserts, concrete Foundation relies n� solid underlying layer, laid on the surface cleared and compacted subgrade, in addition, the perimeter of the footprint of the Foundation is surrounded by a wall in the soil, which is embedded in the subgrade to the required depth.

2. The Foundation under the column grid according to claim 1, characterized in that the base can be strengthened by piles with heads under each of the columns, located on the Foundation.



 

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