RU2223368C2 - Foundations - Google Patents

Abstract

FIELD: construction of flat foundations - shells for industrial purposes and civil engineering. SUBSTANCE: foundation includes thin- walled shell put on soil base. Shell is formed of reinforced concrete having zero or positive Gaussian curvature with relation between rise and span equal to

and relation between cross-sectional height and span equal to

Description

The invention relates to the field of construction of areal foundations-shells and can be used in industrial and civil engineering.

Known areal foundations-shells used in industrial and civil engineering [1]. A feature of existing structures is a structural form that is convex with respect to the soil, which determines the operation of the foundations-shells mainly for compression. The disadvantage of such structures is the difficulty of forming the base of such foundations and the introduction of additional elements for the perception of spacer efforts, as well as significant additional costs for flooring.

The closest in essence and the technical result achieved is the foundation, which includes an absolutely flexible upward convex sheath made of high-strength fabric, laid on a soil base [2]. The ends of the sheath are attached to the supports.

The disadvantage of this design is the significant deformability of the shell due to the low modulus of elasticity of high-strength fabric, which leads to excess building upsetting and complicates the installation of floors. It is assumed that the distance from the shell is perceived due to the friction forces at the contact of the support - the ground.

The purpose of the invention is the creation of effective areal foundations in compliance with the specified reliability of the foundation structure.

и соотношением высоты сечения к пролету

и ограничена опорным контуром в виде кольца или системы перекрестных балок, при этом армирование оболочки выполнено однослойным стальной или синтетической арматурой, заанкеренной в теле бетона опорного контура.The solution of this technical problem is achieved by the fact that in the foundation, including a shell laid on a soil base, according to the invention, the shell is made of thin-walled reinforced concrete of zero or positive Gaussian curvature with the ratio of the boom to span

and the ratio of the height of the cross section to the span

and limited by a support contour in the form of a ring or a system of cross beams, while the shell reinforcement is made of single-layer steel or synthetic reinforcement, anchored in the concrete body of the support contour.

The invention is illustrated graphically, where:

figure 1 shows a General view of the foundation shell of zero Gaussian curvature;

figure 2 is a General view of the foundation shell of a positive Gaussian curvature;

figure 3 is a General view of the foundation shell, made in the form of a system of cross beams;

figure 4 is a fragment of the foundation-shell, made in the form of a support contour.

и соотношением высоты сечения к пролету

и ограничена опорным контуром 2, 3 в виде кольца или системы перекрестных балок. В качестве несущего элемента оболочки 1 используется стальная арматура (на чертежах не показана), обработанная антикоррозионными составами, или синтетические волокна (на чертежах не показана) с высоким модулем упругости. Распор в конструкции снижается за счет ее конечной жесткости. Восприятие распора осуществляется за счет совместной реализации сил трения по контакту оболочка - грунт, изгибной жесткостью опорного контура 2, 3 в горизонтальной плоскости и отпором грунта вдоль опорного контура 2, 3. Заанкеривание арматуры (на чертежах не показана) оболочки 1 производится в теле бетона опорных контуров. Армирование оболочки выполняется однослойным.This foundation is presented in the form of a shallow shell 1, bounded by a ring 2 or a system of cross beams 3. With this structural form, the shell on the soil base 4 works mainly in tension. Shell 1 is thin-walled reinforced concrete of zero or positive Gaussian curvature with the ratio of the boom to the span

and the ratio of the height of the cross section to the span

and is limited by a support contour 2, 3 in the form of a ring or a system of cross beams. As the supporting element of the casing 1, steel reinforcement (not shown in the drawings) treated with anticorrosion compounds or synthetic fibers (not shown) with a high modulus of elasticity is used. The spacer in the structure is reduced due to its ultimate stiffness. The perception of the thrust is carried out due to the joint implementation of the friction forces at the shell – soil contact, the bending stiffness of the support contour 2, 3 in the horizontal plane, and the soil is repulsed along the support contour 2, 3. Anchoring of reinforcement (not shown) of the shell 1 is made in the body of the concrete supporting contours. Shell reinforcement is single-layer.

Sources of information

1. Tetior A.N. Design and construction of cost-effective foundation designs. Kiev, Budivelnik, 1975, 200 p.

2. A.S. 715722 M. cl. E 02 D 27/01. Foundation. O.V. Snezhko No. 2598229 / 29-33. Claim 03/10/78, publ. 02/25/80.

Claims (1)

The foundation, including the shell laid on a soil base, characterized in that the shell is made of thin-walled reinforced concrete of zero or positive Gaussian curvature with the ratio of the boom to span

and the ratio of the height of the cross section to the span

and limited by a support contour in the form of a ring or a system of cross beams, while the shell reinforcement is made of single-layer steel or synthetic reinforcement, anchored in the concrete body of the support contour.

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