RU2305154C1 - Method for slab-and-pile foundation erection - Google Patents

Abstract

FIELD: construction, particularly pile foundations constructed in weak, collapsible and filled-up soil.

SUBSTANCE: method involves forming piles; creating grillage slab so that gaps are created between the slab and each pile; connecting the piles with grillage. After slab forming basement and building superstructure are serially erected. Piles are connected to grillage slab after soil settlement under foundation by supplying concrete mix through openings made in basement walls to grout gaps left around each pile and to form uniting reinforced concrete layer.

EFFECT: increased load-bearing capacity due to efficient load distribution among slab and piles.

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Description

The proposed method relates to the field of construction and can be used in the construction of reinforced concrete slab-pile foundations of buildings and structures, in particular during construction on weak, unevenly compressible, subsidence, bulk soils.

There is a method of arranging a pile foundation, including immersing piles in the soil, making grillage slabs on the soil surface with leaving gaps around each pile, compressing the slabs in the soil with spacers and filling in the gaps around each pile (ed. Certificate of the USSR No. 920114 from 30.05. 80 g., E02D 27/12).

The disadvantage of this method is the limited technological capabilities associated with the need to use spacers.

The closest technical solution to the proposed invention is a method comprising immersing piles in soil, making a grillage plate with through holes on the soil surface and combining piles with grillage plate (ed. Certificate of the USSR No. 1315566, bull. No. 21 from 07.06.87, Е02D 27/12).

The disadvantage of this method is the technological difficulties associated with the need to immerse piles from the surface of the plate.

The problem to which the present invention is directed, is to increase the bearing capacity of the slab-pile foundation by rational distribution of loads between the slab and pile parts of the combined foundation.

The essence of the invention lies in the fact that the method of erecting a slab-pile foundation includes installing piles in the ground, making a grillage plate on the planned surface of the pit with gaps around each pile, combining the pile and slab parts of the foundation. At the same time, the piles are joined with the grillage slab after the soil is sedimented under the slab by supplying concrete mixture through the openings in the basement walls, filling in the gaps around each pile and making a joint screed.

Piles are arranged both from the bottom of the pit, and from the level of the day surface using any technology. When piles are installed from the level of the day surface after the development of the pit, the pile heads are cut down to the design level. Then, on the prepared surface of the bottom of the pit, a monolithic reinforced concrete foundation slab is made without reinforcing it with piles due to the gaps left around the piles. After curing with concrete, the slabs begin the sequential construction of the basement and the aboveground part of the building. During the construction process, the load from the dead weight of the building or its part is transferred only to the slab, as a result of which it undergoes sediment, compressing the soil underneath. After this, the plate and pile parts of the foundation begin to be joined by monoling gaps and installing reinforced concrete unifying screeds. To feed the concrete monolithic in the walls of the basement provide openings, which can be both temporary for the construction period, and permanent to fill the window blocks. The size of the openings depends on the size of the devices for conveying the concrete mixture, which can be carried out along the sleeves of concrete pumps, belt conveyors of a grooved or rectangular cross-section, gutters or vibration ditches.

The method of erecting a slab-pile foundation is illustrated by drawings, where Fig. 1 shows a slab-pile foundation at the first stage of construction, during which the piles are not connected to the foundation slab due to the gaps left around; figure 2 is a section of a slab-pile foundation with an erected building; figure 3 - node pair plate and pile parts of the combined foundation after monolithic.

The method of construction of a slab-pile foundation is as follows. Piles 1 are arranged according to any technology. Then, on a planned surface 2 of the bottom of the pit, a monolithic reinforced concrete slab 3 of the foundation is made without interfacing with piles 1, due to the left gaps 4 around the piles. After the concrete slab 3 has gained strength, the construction of the basement 5 and the aboveground part of the building 6 begins, while the dead weight of the building or part of it is perceived only by the slab 3. As a result, the slab 3 undergoes sediment s, compressing the soil underneath. Then through the openings 7 in the walls of the basement serves concrete mixture for monolithic gaps 4, manufacturing a unifying reinforced concrete screed 8 and get a slab-pile foundation.

The authors by calculation method found that the bearing capacity of the slab-pile foundation, taking into account the sealing effect caused by the loading of the grill slab with the building's own weight, increases by 20 ... 50%.

Claims (1)

A method of erecting a slab-pile foundation, including installing piles, making a grillage slab with gaps around each pile on the soil surface, combining piles with a grillage slab, characterized in that after manufacturing the slab with gaps, the basement and the aboveground part of the building are sequentially erected, and the piling is merged with a slab, grillage is produced after soil is sedimented under the slab by supplying concrete mixture through openings in the walls of the basement, filling in the gaps around each pile and making the same reinforced concrete screed.

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