Method for erection of monolithic foundation for nuclear power plant and arrangement of nuclear power plant foundation

FIELD: construction.

SUBSTANCE: inventions relate to the field of foundation engineering of deep burial for important objects, such as nuclear power plants. Method for erection of nuclear power plant foundation consists in engineering-geological survey with detection of soil foundation layers depth, which complies with depth of active compressing thickness H, its physical-mechanical properties: angle φ of inner friction, c - specific adhesion, γ - density, E0 - module of common deformation, µ0 - coefficient of Poisson, which correspond to design elastic compressing load under deep buried foundation, in erection of mine pit with shape that corresponds to foundation, filling of filled layer of soil onto mine pit bottom and its compaction, erection of curb with reinforcement frame inside and its filling with high grade concrete. Foundation, which is solid in plan, is given convex spherical shape, which is inscribed in plan into configuration of monolithic foundation by radius of circumference, radius of sphere is identified by given dependencies, as well as maximum angle of elastic semi-contact of foundation sphere with soil foundation, pressure of structural tensile strength of foundation, central critical pressure under center of sphere in maximum elastic base. Bottom of mine pit for concave foundation is arranged with response spherical groove.

EFFECT: improved bearing capacity of foundation, improved elastic contact interaction of foundation with underlying soil foundation.

2 cl, 7 dwg

 

The invention relates to the field of Foundation structures responsible deep foundations.

A known method of construction of the monolithic vertical cylindrical or rectangular reinforced concrete deep Foundation nuclear power plant, which consists in carrying out engineering-geological surveys to determine the depth of the layers of the ground, the depth of the active compressive thickness of the physico-mechanical characteristics: angle of internal friction φ, with specific clutch, γ is the density, E0module total strain, µ0- Poisson's ratio, the appropriate design of elastic compressive load under a flat Foundation vertical cylindrical or rectangular shape, in the construction of the pit corresponding to the Foundation of a vertical cylindrical or rectangular shape with a flat bottom, the bottom of the pit occiput sand and compacted, erecting formwork with steel reinforcing cage inside, which is concreted high marks [1].

The disadvantage of this method of construction monolithic Foundation nuclear power plant is a low-range elastic interaction between a flat round or rectangular bottom of the basement filled with artificial and underlying natural ground base, the border to the showing in-phase elastic contact interaction is theoretically not installed, and taken according to stumpokapow, which vary depending on the area of the rigid planar cylindrical or rectangular soles of the stamp and the value assigned degrees of loading of the test soil increasing static loads, defining the boundaries of the elastic contact interaction. The amount of active compressive thickness of the base under Foundation assigned approximately depending on the size of the Foundation and the depth of its inception.

Process result by the method of construction of the Foundation of the nuclear power plant, which consists in carrying out engineering-geological surveys to determine the depth of the layers of the ground, the depth of the active compressive thickness H, its physical and mechanical characteristics: angle of internal friction φ, with specific clutch, γ is the density, E0module total strain, µ0- Poisson's ratio, the appropriate design of elastic compressive loadunder the deep Foundation in the construction of the pit corresponding to the base form in place on the bottom of the pit bulk soil layer and seal in the construction of the formwork with steel frame inside and fill it with concrete high marks, is achieved by the fact that solid in terms of the Foundation give a convex spherical shape,fit into the plan configuration footing on the radius of the circle , where b is the width of the square Foundation radiuswhere- maximum angle elastic polycontact areas of the basement, ground base,- pressure structural strength of the substrate tensile,Central critical pressure under the center of the sphere in the most elastic Foundation, allowable pressure of the elastic interaction between the soles of the spherical base with the underlying ground base is defined aswhere- radius plot the critical pressure under field Foundationat the bottom of the pit under convex Foundation operates with the response of a spherical recess to a depth of.

Known Foundation nuclear power plant, made in the form of deeply embedded in the underlying subgrade concrete monolith with vertical walls and a flat bottom round or square in plan form area of F, providing elastic contact with the underlying ground base at design pressurethis flat bottom of the Foundation is installed on an artificial soil layer, filled in the flat bottom of the response of the Foundation is ulovane [1].

A disadvantage of the known device of foundations of nuclear power plants is extremely low elastic bearing capacity of the underlying soil Foundation under the flat bearing surface of the Foundation square and more round in shape.

The technical result for the Foundation of a nuclear power station deep under the surface, made in the form of a monolithic reinforced concrete structure with vertical walls made around the perimeter of a square with side b or the circular plate of radius r, installed in the pit return form in bulk and underlying soil Foundation, which is characterized by physico-mechanical properties: angle of internal friction φ, specific adhesion - C, E0module total strain, µ0- Poisson's ratio, γ is the density of the addition, the appropriate design of elastic compressive loadunder the Foundation area F, is achieved by the fact that a solid Foundation is square or circular in plan form, is made convex on the radius of the spherewhere- the radius of the circle imprint areas Foundation in the underlying base, b is the width of the square Foundation- maximum angle elastic polycontact areas Foundation with grunt the first base, - pressure structural strength of the substrate tensile,Central critical pressure under the center of the sphere in the most elastic Foundation, with the maximum permissible elastic pressure under field on the underlying subgradewhere- radius plot the critical pressure under field Foundationat the bottom of the pit under the convex Foundation is made with the response of a spherical recess to a depth of

The invention is illustrated graphic material, in which figure 1 is a General view of the vertical cylindrical concrete Foundation with a spherical bottom, figure 2 - type A (top) figure 1, figure 3 - General view of the vertical square concrete Foundation with a spherical bottom, figure 4 - type B (top), figure 3, figure 5 - diagram of the manifestations of the Central critical loadon soil Foundation under spherical Foundation in the most elastic phase condition with plots of the development of the contact pressure, 6 - development of elastic sediment soil Foundation under spherical Foundation, Fig.7. dependence of the maximum anglepolycontact sphere with the ground at angles φ of its internal friction.

The device is fundamental is that 1 nuclear power plant deep foundations made in the form of a monolithic reinforced concrete structure with vertical walls 2, made around the perimeter of a square with 3 side b (3, 4) or all 4 in terms of the bottom (1, 2) with radius r, installed in the pit 5 response form on bulk and underlying soil Foundation 6, characterized physico-mechanical properties: angle of internal friction φ, specific adhesion - C, Eomodule total strain, µo- Poisson's ratio, γ is the density of the addition, the appropriate design of elastic compressive loadunder the Foundation area F, while the solid Foundation of 3 square or round 4 in plan form is made convex on the radius of the spherewhere- the radius of the circle imprint areas Foundation in the underlying base, b is the width of the square 3 in terms of Foundation,- maximum angle (Fig 1, 3, 5, 6, 7) elastic polycontact areas of the basement, ground base,- pressure structural strength of the substrate tensile,Central critical pressure under the center of the sphere in the most elastic Foundation with the maximum permissible elastic pressure under field on the underlying subgradewhere- radius plot the critical pressure areas under the th Foundation at the bottom of the pit under the convex Foundation is made with the response of a spherical recess to a depth of (6)

The method of construction of the Foundation 1 (1-4) nuclear power plant is to conduct geotechnical investigations to determine the depth of the layers of the ground, the depth of the active compressive thickness H, its physical and mechanical characteristics: angle of internal friction φ, with specific clutch, γ is the density, Eomodule total strain, µo- Poisson's ratio, the appropriate design of elastic compressive loadunder the deep Foundation in the construction of the pit corresponding to the base 1 forms, in the filling on the bottom of the pit bulk soil layer and seal in the construction of the formwork reinforcing cage inside and fill it with concrete high marks, while solid in terms of the Foundation 1 give a convex spherical shape, fit into the plan configuration footing on the radius of the circle (figure 1, 2), where b is the width of the square (figure 3, 4) in terms of the Foundation, radiuswhere- maximum angle elastic polycontact sphere (1, 3, 5-7) Foundation, ground base,-pressure structural strength of the substrate tensile, Central critical pressure under the center of the sphere in the most elastic Foundation, allowable pressure of the elastic interaction between the soles of the spherical base with the underlying ground base is defined aswhere- radius plot the critical pressure under field Foundationat the bottom of the pit under convex Foundation operates with the response of a spherical recess to a depth of

We offer the spherical shape of the bearing surface of the deep Foundation nuclear power plant can significantly extend the pressure range of the elastic contact interaction with the underlying soil Foundation.

Sources of information

1. II Artobolevsky I.I. Polytechnical dictionary. - M.: "Soviet encyclopedia", 1977. - Ñ.38 (nuclear power plant), (prototype according to the method and the device).

1. The method of construction of the Foundation of the nuclear power plant, which consists in carrying out engineering-geological surveys to determine the depth of the layers of the ground, the depth of the active compressive thickness H, its physical and mechanical characteristics: angle of internal friction φ, with specific clutch, γ is the density, E0module total strain, µ0- Poisson's ratio of the respective elastic design compressive load under the deep Foundation in the construction of the pit corresponding to the base form, the filling on the bottom of the pit bulk layer of the soil and its compaction, construction formwork with steel frame inside and fill it with concrete high marks, characterized in that the solid in terms of the Foundation give a convex spherical shape, fit into the plan configuration footing on the radius of the circle, where b is the width of the square Foundation, radiuswhere- maximum angle elastic polycontact areas of the basement, ground base,- pressure structural strength of the substrate tensile,Central critical pressure under the center of the sphere in the most elastic Foundation, with the bottom of the pit under convex Foundation operates with the response of a spherical recess to a depth of.

2. The construction of the Foundation of the nuclear plant, deep-laid, made in the form of a monolithic reinforced concrete structure with vertical walls made around the perimeter of a square with side b or the circular plate of radius r, installed in the pit return form in bulk and underlying soil Foundation, ha is acteresses physical and mechanical properties: φ - the angle of internal friction, specific adhesion - C, E0module total strain, µ0- Poisson's ratio, γ is the density of the addition, the appropriate design of elastic compressive loadunder the Foundation area F, characterized in that a solid Foundation is square or circular in plan form, is made convex on the radius of the spherewhere- the radius of the circle imprint areas Foundation in the underlying base, b is the width of the square Foundation- maximum angle elastic polycontact areas of the basement, ground base,- pressure structural strength of the substrate tensile,Central critical pressure under the center of the sphere in the most elastic Foundation, with the bottom of the pit under the convex Foundation is made with the response of a spherical recess to a depth of



 

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