Self-supporting three-dimension prestressed structure, method and device for its construction

Abstract

This invention relates to a self-supporting three-dimensional prestressed structure, as well as a method and a device for erecting same, to be employed in the construction of residential and nonresidential buildings. The structure is constructed of vertical form-defining flexible rodlike members (1) stressed during the construction of the structure, as well as horizontal flexible rodlike members (2) each forming a closed curve. The horizontal members (2) are also stressed during construction and welded or rigidly affixed by other means to the vertical form-defining members (1). Instead of horizontal circular members (2) the structure can be constructed completely or to some extent using a spiral member, also stressed during the construction of the structure that is rigidly affixed to the vertical form-defining flexible members (1).

Claims

1. A device for construction of self-supporting three-dimensional prestressed structure comprising a number of symmetrically and radially positioned telescopic arms (4) each hinged to a circle (5) positioned at the center of the device, wherein at the tip of each telescopic arm (4) a guide block holds a corresponding vertical member (1), wherein the telescopic arms remain hinged to the device at a base area of the structure, wherein the guide block comprises two parallel plates (7) fixed to the telescopic arms (4), and wherein between said plates (7) are installed in sequence grooved rollers (8), with an opening between two rollers (8) being at least equal to the cross-sectional diameter of the vertical member to be held between the two rollers.

2. A method for construction of self-supporting three-dimensional prestressed structures comprising: selecting a geometric center for a structure; positioning and affixing a central circle (5) of a device for construction of self-supporting three-dimensional prestressed structures at a geometric center of the structure; configuring telescopic arms (4) of the device to conform to an intended size and shape of the structure; inserting one end of a vertical member (1) through a guiding block (6) on a respective telescopic arm (4) and into a prepared socket in a foundation of the structure; moving incrementally upward each telescopic arm (4) along its respective flexible vertical member (1), either in sequence or simultaneously, thus stressing the flexible vertical member (1); following each incremental upward step of all telescopic arms (4), fixing an achieved elevation by attaching horizontal flexible members (2) around the flexible vertical members (1) to form a contour; after the structure has been completed, removing the device (3), wherein the telescopic arms remain hinged to the device at a base area of the structure, making openings of shapes in the structure by making frames with required dimensions and shape, affixing the frames at required positions, affixing bordering sections of the structure to the frames, and cutting away excess parts of the structure enclosed in the frames, and sheathing the structure in reinforcing mesh and plastering over and finishing in building materials comprising at least one of cement, clay, and adhesive mix.

Description

DESCRIPTION OF THE DRAWINGS

(1) A possible embodiment of the invention is illustrated by the drawings, whereas:

(2) FIG. 1 is an axonometric view of a self-supporting three-dimensional prestressed structure shaped as a hemisphere;

(3) FIG. 2 shows a device for construction of self-supporting three-dimensional prestressed structures;

(4) FIG. 3 is axonometric view of a guiding block fitting of the device for erecting the structure;

(5) FIG. 4 shows the start of construction of a self-supporting three-dimensional prestressed structure;

(6) FIG. 5 shows a bent vertical rodlike member attached to a telescopic arm of the device;

(7) FIG. 6 shows a bent vertical rodlike member held in a guiding block fitting;

(8) FIGS. 7 and 8 show consecutive stages of construction of a self-supporting three-dimensional prestressed structure;

(9) FIG. 9 shows a finished and covered self-supporting three-dimensional prestressed structure.

AN EXAMPLE EMBODIMENT OF THE INVENTION

(10) An example of the construction of a self-supporting three-dimensional prestressed structure, is shown in FIG. 1. The example shows a self-supporting three-dimensional prestressed structure shaped as a hemisphere. The structure is constructed of vertical form-defining flexible rodlike members (1) stressed during the construction of the structure, as well as horizontally positioned flexible rodlike members (2) each forming a circular contour. The horizontal members which are also stressed are welded or rigidly joined by other means to the vertical form-defining rodlike members (1).

(11) The horizontal circular contours are parallel to each other.

(12) The device for construction of self-supporting three-dimensional prestressed structures is shown as (3) on FIG. 1.

(13) Instead of horizontal circular members (2) the structure can be constructed completely or to some extent using a spiral member, also stressed during the construction of the structure that is rigidly affixed to the vertical form-defining flexible members (1).

(14) The device (3) for the construction of the self-supporting three-dimensional prestressed structure and the implementation or the method comprises a number of symmetrically and radially positioned telescopic arms (4) each hinged to a circle (5) positioned, at the center of the device FIG. 2. At the tip of each telescopic arm (4) there is a guide block fixing (6) FIG. 3. In this embodiment the guide block (6) comprises two parallel, plates or cheeks (7) fixed to the telescopic arm (4), whereas between said cheeks (7) are installed in sequence grooved rollers (8). The opening between the rollers (8) is at least equal to the cross-sectional diameter of the vertical rodlike member (1) to be held between them.

(15) By varying the lengths of the telescopic arms (4) it is possible to configure three-dimensional prestressed structures with different shapes.

(16) The method for construction of self-supporting three-dimensional prestressed structures, which also explains the operating principle of the device, comprises the following operations in the sequence below:

(17) 1. A site and of a geometric center for the structure are selected. If the structure will be shaped as part of a sphere, such as a hemisphere (FIG. 4), the radius of the structure is also determined;

(18) 2. The site is leveled underneath the selected geometric center and a foundation is laid;

(19) 3. The material for the structure's framework is selected and prepared. Commonly used materials are flexible members (1), made for instance of wood, plastic or composite with rodlike or pipe profile;

(20) 4. The raster for the structure is determined, namely the number of the vertical and horizontal members for the intended structure with hemispherical (or more complex) shape. The thickness of the material and the raster are determined based on the intended purpose of the structure and the type of the material;

(21) 5. The device for construction of self-supporting three-dimensional prestressed structures (3) is then placed on the foundation and fixed to same;

(22) The number of the telescopic arms (4) of the device corresponds to the number of the vertical rodlike members of the intended structure. When building a hemisphere, the length of the telescopic arms (4) is a constant number equal to the radius of the structure. When building more complex shapes, the length of each telescopic arm (4) can vary in each stage of the construction process, in order to achieve the intended complex three-dimensional shape.

(23) 6. The vertical rodlike members (1) are placed at regular intervals along the circumference of the intended structure, and then they are fed through the guiding blocks (6) of the telescopic arms (4). For better stability, the rodlike members (1) can be anchored into prepared sockets underneath the guiding blocks (6). The sockets can be prepared from sections of metal pipe with inside diameter greater than the diameter of the selected material that are driven into the foundation. If a concrete foundation is laid under the outside perimeter of the structure, the vertical flexible members can be affixed directly into the concrete.

(24) 7. The next stage is the upward movement of the guiding blocks (6) of the telescopic arms (4) along the corresponding vertical rodlike members (1) FIGS. 5 and 6. The movement of each guiding block (6) along the corresponding flexible rodlike member (1) stresses it and forces is to form a circular arc.

(25) The upward movement of all guiding blocks (6) along the vertical rodlike members (1) can be either sequential or simultaneous.

(26) 8. A horizontal circular member (2) is placed and affixed welded) around the bent vertical rodlike members (1).

(27) 9. The upward movement of each telescopic arm (4) (at increments determined by the selected raster) is sequentially alternated with the attachment of a horizontal flexible rodlike member (2) (circular in the case of a hemisphere or with more complex closed-contour shape for a structure with a more complex shape)FIGS. 7 and 8. The horizontal flexible rodlike members (2) are affixed rigidly to each vertical rodlike member (1) by means of a fitting or by welding. When each horizontal flexible rodlike member (2) is fully attached it fixes all vertical rodlike members (1) and equalizes their tension.

(28) 10. When the entire structure is complete the device (3) is in the configuration all arms in a vertical bundle FIG. 1. At this point the constructed three-dimensional structure is fully self-supported, and all forces/vectors acting on the structure are in equilibrium. At this stage the device (3) can be removed from the structure and be ready for reuse.

(29) 11. If the design requires the making of openings in the structure (doors, windows, etc.), the frames with the required dimensions and strength are made first, and then affixed at the required positions. The bordering sections of the structure are affixed/welded regularly to the frames, and only then the excess parts of the structure enclosed in the frames are cut away. Any cutting of unframed sections of the stressed structure would cause the abrupt release of the tension with catastrophic results.

(30) 12 The complete structure can be covered in waterproofing or other material, or in concrete, and it can be used for civic and production halls, residential buildings, greenhouses, temples, swimming pools and other structures FIG. 9.