Heat-insulated footing

FIELD: constructional engineering.

SUBSTANCE: invention refers to constructions on heaving soils. House footing based on freezing through soils includes a rigid body with flanges and indents from soil side, footing indent inserts made of heat-insulating material, e.g. polystyrene foam at such ratio of flange and footing indent areas that soil pressure from the lower flange surface is not less than standard pressure of frost soil heaving, soil pressure from the lower insert surface is not exceeding design compression resistance of insert material. Also, the said footing contains supplementary heat insulation laid outside of the footing. The upper edge of supplementary heat insulation is passed from external edge of the footing in the form of interrupted inserts through rigid body of the footing and connected to supplementary heat insulation of opposite external edge of the footing. Relative area of interrupted inserts (β=Aint.ins./A0) is given by the relation β≤1-σmax/R, where Aint.ins. is sectional area of interrupted inserts, m2, A0 is gross sectional area of the footing within inserts arrangement regions, m2, σmax is maximum external load pressure in footing material, MPa, R is design resistance of footing material, MPa. Indents and flanges of the footing from soil side are alternating along footing length. Indents centres from soil sides are provided under interrupted inserts centres of supplementary heat insulation from each external edge of the footing.

EFFECT: possibility to lay foundation above the design depth of heaving soil frost penetration level.

4 dwg, 1 tbl

 

The invention relates to the field of construction and is used in the construction of buildings and structures on freezing swelling soils.

Known foundations on frozen soil (Foundation-equivalent), including rigid body with tabs and indents on the side facing the ground, and inserts in the indents and extra base insulation near the Foundation of insulating material, for example polystyrene, and the area ratio of the protrusions and indents Foundation is such that the ground pressure on the lower surface of the projections was not less than the value of the normal pressure of frost heaving of the soil, and the ground pressure on the lower surface of the liners is not more than a value calculated resistance of the material of the liners in compression, as well as additional insulation placed outside of the basement (RU # 2135693, MKI602D 27/01, 27/35 "Insulated Foundation" [1].

Lack of Foundation-analogue is low insulating ability to protect soil from freezing.

Closest to the claimed object, the technical solution is the Foundation on frozen soil (Foundation-prototype), including rigid body with tabs and indents on the side facing the ground liners in the indents of the Foundation, made of insulating material is a, for example expanded polystyrene, with the ratio of the areas of the protrusions and indents Foundation such that the ground pressure on the lower surface of the projections was not less than the value of the normal pressure of frost heaving of the soil, and the ground pressure on the lower surface of the liners is not more than a value calculated resistance of the material of the liners in compression, as well as additional insulation placed outside the Foundation, with the upper edge of the additional insulation is omitted from the outer edge of the Foundation in the form of intermittent liners through the rigid body of the base and connected to the additional insulation the opposite outer edge of the Foundation and the relative area of intermittent liners (β=Andother VK/A0) is taken from the relation

where aprvc- the cross-sectional area intermittent liners, m2;

A0- the cross-sectional area of the basement gross in the place of installation, liners, m2;

σmax- the maximum stress in the material of the base from stress, MPa;

R is the calculated resistance of the material of the Foundation, MPa (Patent RU №2237780, MKI6E02D 27/01, 27/35 "Insulated Foundation" [2].

The lack of Foundation of the prototype is insufficient thermal insulation capacity for the protection of soil from freezing.

the fir of the claimed invention is to provide a more effective protection heaving soils from freezing, in particular due to more rational allocation of indents with liners and basement from the side adjacent to the ground.

This objective is achieved in that in the base on the frozen ground under the patent RU №2237780 in the proposed insulated Foundation indent and the basement from the side adjacent to the ground, made of alternating along the length of the Foundation, at the indents on the side facing the ground, placed under the centers intermittent inserts additional insulation, missing from each outer edge of the Foundation.

The thickness of the liners in indents (hVKand thickness of the liners additional insulation, missing from each outer edge of the Foundation (h0), is determined by thermotechnical calculation of conditions reduce the heat flow from the soil Q. it follows From the computations that the effectiveness of thermal insulation in comparison with the Foundation of the prototype increases substantially with the accommodation centres indents from the soles of the Foundation turned to the ground, directly under the centers intermittent inserts additional insulation.

The stability of the Foundation under the action of normal forces of frost heave in freezing soils provided that passed for soil pressure within the projections psunis such, what button it was not less than the value of normal pressure frost heaving of the soil p n,f. It is known that when the pressure on the sole Foundation in excess of pn,f, deformation of rebound does not occur. The second possible option to improve the stability of the Foundation against the forces of frost heave, which follows from claim 2 of the patent RU №2135693 [1], the placement of the insulation directly under the basement.

In the proposed insulated Foundation saved the requirements of the Foundation: ground pressure within the liners in the indents pVKshould not exceed the design resistance of the material of the liners PSGand sediment Foundation Scpcalculated taking into account the increased compressibility of the liners, the magnitude of the normalized maximum allowable precipitation Su.

A set of proposals provides an implementation goal of providing more effective than the Foundation of the prototype protection heaving soils from freezing due to more rational allocation of indents with liners and basement from the side adjacent to the ground.

When analyzing the level of technology is not revealed similar, characterized by signs, identical to all the essential features of the proposed solution, i.e. it meets the requirements of novelty.

Not detected signs that are distinctive in the inventive solution, the. it meets the requirement of inventive step.

The invention is illustrated by drawings: figure 1 shows insulated strip Foundation, loaded linear load n and sunk into the soil to a depth d; figure 2 and 3 are cross - sections 1-1 and 2-2; figure 4 - calculated scheme and plot the pressure distribution on the sole Foundation.

Foundation (Fig.1-3) includes a rigid body 1, made of reinforced concrete, with 2 tabs and indents 3 from the side adjacent to the bottom of the liners 4 and 5 EPS, placed respectively under the 2 tabs and indents 3 and additional insulation 6, placed at some distance outside the Foundation 1. The 2 tabs and indents 3 Foundation 1 is made of alternating along the length of the Foundation 1. The upper parts of the additional heater 6, is placed outside the Foundation, skipped in the form of intermittent liners 7 through the body of the Foundation 1 and is connected to the upper areas of additional insulation material 6 placed on the opposite side of the Foundation 1.

For example, illustrating the invention, taken with the following initial data:

- the load on 1 m length (l=1.0 m) Foundation 1: n=350 kN/m;

- the width of the sole Foundation 1: b=2.0 m, the upper part of the b0=0.5 m;

size of the sole Foundation 1: A=l b=1.0·2.0=2.0 m2/m;

- gross area of the fundamental is 1 and in section, where there is intermittent liners 7: A0=lb0=1.0·0.5=0.5 m2/m;

- dimensions of the protrusions 2: width equal to the width of the Foundation 1: b=2.0 m; the length along the Foundation of the 1: l1=0.5 m; the distance between the edges of the protrusions 2, equal to the length of indents 3 along the Foundation of the 1: l2=0.5 m;

- dimensions intermittent liners 7: length along the Foundation 1: c1=0.5 m; the width equal to the width of the top of the Foundation 1: b0=0.5 m; the distance between intermittent liners 7 along the length of the Foundation 1: c2=0.5 m;

- the average pressure on the sole Foundation 1: Rcf=n/A=175 kPa;

the depth of laying the Foundation 1: d=0.50 m;

the modulus of deformation of the inserts 4, 5 (EPS): (EVK=1.0 MPa;

is the calculated thickness of the liners 4: NVK,4=0.02 m; liners 5: NVK,5=0.1 M;

- current resistance of the polystyrene inserts 4, 5: RSG=150 kPa;

- current resistance of the concrete Foundation 1: Rb=5.2 MPa = 5200 kPa;

- estimated depth of soil freezing: df=1.9 m;

- normal pressure frost heaving: pn,f=200 kPa;

- design ground resistance: Rg=220 kPa;

- sludge Foundation 1 without taking into account the compressibility of the pads 4, 5: Scp=4.5 cm;

the stiffness coefficient of reasons: Toabout=pcp/Scp=3.89 MPa/m

To select a rational ratio α=Asun/A space vystupov to the total area of the Foundation 1 And(a=a sun+AVK) performed calculations of pressure on ground on the lower surface of the protrusions 2 - psunand inserts 5 - RVK, as well as the resulting precipitate Foundation 1 (S), taking into account the compressibility of the pads 4, 5. Calculations made according to the formula:

The results of calculations for different values of the relative area of the projections presented in the table.

The relative size projections α=Andsun/AGround pressure, kPa, on the lower surfaceSludge Foundation's, cm
projections psuninserts pVK
0.0-1756.60
0.22261626.45
0.32181576.04
0.42101515.83
0.5*2031475.64
0.61971415.46
0.81851335.14
1.0175- 4.85

The table shows that the optimal ratio is α=0.5, marked in the table by an asterisk. The greatest pressure on the ground on the lower surface of the protrusions 2 - Rsun=203 kPa does not exceed the calculated ground resistance Rg=220 kPa, and the conditions(2)...(4):

(2): psun=203>pn,f=200 kPa;

(3): pVK=147<RSG=150 kPa;

(4):S=5.64<Su=10.0, see

Check device capabilities intermittent liners 7:

0.50<1-1400/5200=1-0 .27=0.73,

where β=AndPR VK./A0=0.25/0.50=0.50;

Andprvc.=C1b0=0.5·0.5=0.25 m2- the cross-sectional area intermittent liners 7;

And0=(C1+C2)b0=(0.5+0.5)0.5=0.50 m2- the cross-sectional area of the basement 1 gross in the setup intermittent liners 7;

σmax=n(c1+C2)/(c2b0)=350(0.5+0.5)/(0.5·0.5)=1400 kPa - maximum stress in the material of the Foundation 1 from external loads;

R=Rb=5.2 MPa=5200 kPa - current resistance of concrete.

Thus, the requirements imposed on the design of foundations in the above example are satisfied.

Figure 2 shows the position and dimensions of intermittent liners 7; figure 4 - dimensions of the Foundation and the distribution of pressure on the sole Foundation 1 with the accepted value α =0.5 in the form of plots: position 9 is the pressure on the surface of the liners 5 (pVK), pos.10 - pressure on the surface of the protrusions 2 (psun), pos.11 - average pressure on the surface of the base 1 as a whole (pcf).

From thermal analysis performed on the program "NEAT-PTF/3" (three-dimensional):

- when performing indents 2 and projections 3 Foundation 1 from the side adjacent to the ground, alternating along the length of the base, the heat flux from the soil Q is reduced by 20% compared to the Foundation of the prototype;

- when placing indents 2 Foundation 1 directly under the centers intermittent liners 7, missed from each outer edge of the Foundation 1, the heat flux Q is reduced by 30% compared to the Foundation of the prototype, due to the lengthening of the path of heat flow Q (item 8 in figure 1) compared to the strictly vertical direction in the base-prototype;

- when placing liners 4 EPS under ledges 2 Foundation 1 achieves a more effective protection of the soil from freezing, allowing complete elimination of the freezing of the soil in winter.

The advantages of the proposed solution heat-insulated Foundation on freezing heaving soils on comparison with the Foundation of the prototype are to provide more effective protection heaving soils from p is amerzone.

List of used materials

1. Patent RU No. 2135693, MKI602D 27/01, 27/35. Insulated Foundation. /WTO and Yergenonsky. - Publ. 27.08.1999, bull. No. 24. - 12 S.

2. Patent RU No. 2135693, MKI6E02D 27/01, 27/35. Insulated Foundation. /WTO, Yergenonsky and Vol. - Publ. 27.01.2004, EN BIPM No. 3. - 8 S.

The foundations on frozen ground, comprising a rigid body with tabs and indents on the side facing the ground liners in the indents of the Foundation, made of insulating material, for example expanded polystyrene, with the ratio of the areas of the protrusions and indents Foundation such that the ground pressure on the lower surface of the projections was not less than the value of the normal pressure of frost heaving of the soil, and the ground pressure on the lower surface of the liners is not more than a value calculated resistance of the material of the liners in compression, as well as additional insulation placed outside the Foundation, with the upper edge of the additional insulation is omitted from the outer edge of the Foundation in the form of intermittent liners through the rigid body of the base and connected to the additional insulation the opposite outer edge of the Foundation and the relative area of intermittent liners (β=Andprvc./A0) is taken from the relation

β≤1-σ max/R

where aprvc.- the cross-sectional area intermittent liners, m2;

A0- the cross-sectional area of the basement gross in the place of installation, liners, m2;

σmax- the maximum stress in the material of the base from external loads, MPa;

R is the calculated resistance of the material of the base, MPa, wherein the indents and protrusions of the basement from the side adjacent to the ground, made of alternating along the length of the Foundation, at the indents on the side facing the ground, placed under the centers intermittent inserts additional insulation, missing from each outer edge of the Foundation.



 

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