RU2379425C1 - Method for erection of slab-pile foundation - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: method for erection of slab-pile foundation includes arrangement of piling field and mattress. Piles are submerged along foundation perimetre, and mattress is produced of two parts - external one, having upward ledges and directly resting on piles, and internal one - with downward ledges, which rests on the external part. At the same time as rated settlement is achieved, external and internal parts of mattress are rigidly joined, thus providing for combined operation of slab-pile foundation.

EFFECT: reduced material intensity, improved bearing capacity of foundation.

2 dwg

Description

The invention relates to the construction and can be used when arranging the foundations of tall buildings in seismic areas.

Solid pile fields are known ("Soil Mechanics, Foundations, and Foundations." M., "Higher School", 2002, a group of authors under the editorship of S.B. Ukhov, p.307). The disadvantage of this solution is the neglect of the compressibility of soils enclosed inside the contour enclosed by piles.

Known "Calculations of sediment and the strength of the foundations of buildings and structures." Goldstein M.N., Kushner S.G., Shevchenko M.I. "Budivelnik", 1977, p.19, fig. 1.6. Compressibility is largely determined by the ability to expand the soil to the sides.

A technical solution is known where the construction of a pile-slab foundation provides for the construction of a pile grillage having the form of a plate (SP 50-102-2003, M., 2004, p.30-31, clause 7.4.10), where it is assumed that approximately 85 Piles perceive the load on the foundation and approximately 15% fall on the slab. All buildings and structures are calculated according to the second limiting state, i.e. for precipitation. If you pile or submerge piles under the entire building or structure, then piles in the middle of the field will not be needed and you can significantly reduce the consumption of piles, given that the compressibility under the slab of the grillage in the middle of the field will increase due to the inability to expand the soil loaded with vertical load and working in a confined space. The amount of draft of the building will be less.

The objective of the invention is to reduce the number of piles that are immersed when placing fields under the entire building or structure.

This object is achieved in that in the method of construction of a pile-slab foundation, including the device of the pile field and the grill, according to the invention, the piles are immersed around the perimeter of the foundation, and the grill is made of two parts - the outer one, having ledges up, immediately resting on the pile , and internal - with ledges down, which rests on the external, while after reaching the settlement draft, the external and internal parts of the grillage plate are rigidly combined, ensuring the joint work of the pile-plate foundation.

The novelty of the proposal lies in the fact that when arranging combined pile-slab foundations (PSC), piles are immersed only along the perimeter of the foundation and create a fenced space so that when the internal grillage is not moving, the soil will not expand to the sides. The deformation modulus is thereby increased in the enclosed portion.

The invention is illustrated in the drawing, where figure 1 shows a plan of the foundation, erected at the first stage of construction, showing the shaded outline of the designed building. Figure 2 shows a cross section of the pile-plate foundation with a part of the above-ground structure, which shows the essence of the docking of individual parts of the pile-plate foundation.

The sequence of the method of construction of the foundation is as follows. First, prepare the soil surface 1 at different depths for the device of the individual parts of the pile-slab foundation. Then, along the perimeter of the foundation, pile 2 is immersed and the outer part 3 of the grillage slab having upward projections is erected, after which, on the prepared soil surface 1, the inner part 4 of the slab of the combined pile-slab foundation with ledges down is erected, which must undergo a draft equal to 1/2 precipitation from the permissible value for the type of building being constructed 5 (see Table E1, Appendix E “Limit deformations of foundations” in SP 50-101-2004 “Design and construction of foundations and foundations of buildings and structures”, p.120), volume while uniting in the process of development of precipitation with ledges of the outer part 3 of the plate. After that, the combined pile-slab foundation will work. If during the construction process the inner part 4 of the precipitation plate is reached, it is necessary to combine the outer 3 and inner 4 parts of the grillage plate to ensure the joint work of the structure. At the same time, the soil inside the pile contour will have altered deformation characteristics, which will reduce the draft of a single pile-plate structure and, as a result, reduce the vertical movements of the entire structure under construction.

Claims (1)

A method of erecting a pile-slab foundation, including a device of a pile field and a grill plate, characterized in that the piles are immersed along the perimeter of the foundation, and the grill plate is made of two parts - the outer one, which has upward ledges, immediately resting on the piles, and the inner one - with ledges to the bottom, which relies on the external, while after reaching the settlement draft, the external and internal parts of the grillage plate are rigidly combined, ensuring the joint work of the pile-slab foundation.

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