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research of is constructive-technological decisions of geodetic domes

The important feature of precast geodetic domes from panels is presence at least two variants of panels: hexagonal and pentagonal (for oktaedralnoj razrezki the tetragonal panel). Therefore constructive decisions of these panels can essentially become complicated.

Different stands or these stands are necessary for manufacturing of panels can be readjusted under other corners and an arrangement of elements.

The first variant of central decisions of panels of precast spherical domes offered razrezok differs exclusive simplicity in manufacturing and assemblage (fig. 4.15 and 5.3). Knots of the one-zone dome collected from assembly panels in the form of correct pentagons and hexagons (fig. 3.1, 5.3, 3.2 and 3.5), increase assembly rigidness at assemblage, and allows to collect quickly and reliably small domes the manual
Assemblages with spans to 12 m also simplify installation of high domes of the big spans [28,136,137].

Fig. 3.2. Variant II.1 of rods and knots of panels of a dome: and and - the central knots of assembly panels; in and g - stykovochnye knots of assembly panels on welding.

The dome gathers from the integrated elements, which in turn
Gather from tubular rods. For creation of compact knot butt ends of pipes of rods are flattened with an excess because of what at elements it is formed utonenie, connection of elements under corners of 50-72 degrees is facilitated and the central element decreases. We will consider consistently each of connections of variant II.1 (fig. 3.2). Connections under letters «and, in and g» are one-piece welded joints of tubular rods. They provide rigid connections in dispatch marks of frame panels and panels in the form of correct pentagons and hexagons at installation. In this variant field connections of panels on bolts (Item 2 variant are provided. Fig. 3.3 and,).

Fig. 3.3. Variant II.2 of assembly knots of a dome from pyramidal panels: and - connection of panels at installation; - connection of basic elements and panels.

From a plane of panels they provide assembly rigidness only at connection more than three knots.

Developed knots are executed with the stamped central
Elements in the thickness not less than 4 mm with the form in the form of a cone not less than 40 mm in height. Thus, at installation four types of the dispatch marks, two of which basic and two private soldiers gather.

In the course of working out of is constructive-technological decisions of precast geodetic domes (fig. 3.1, 5.16) only welded assemblies of the one-zone dome collected by already approved technique (fig. 3.4) from assembly panels in the form of correct pentagons and hexagons (fig. 3) also have been offered. The Dome-canopy gathers c in knots on SH and IY to a variant from the integrated elements [29] which in turn gather from tubular rods.

Fig. 3.4. Variant SH of the decision of knots in assembly panels of a dome.

For creation of compact knot butt ends of pipes of rods also are flattened with an excess because of what at elements it is formed utonenie, facilitating connection of elements under corners of 50-72 degrees.

Fig.

3.5. Variant SH of the decision of knots in panels and assembly knots of panels

Domes.

Here there are no central junction pieces, in difference, from the previous connections. Rods 7 in knots of a precast dome-cover, can be connected by variant IY (fig. 3.7) by means of cylindrical holders 14 to the grooves 15 executed in advance or in a place for assemblage flat on the base of pentagonal and hexagonal pyramids-panels or rhombuses. Rods are in pairs connected to a holder bathing welding 16, then basic plates 17 join basic pyramids-panels, and a part of knots with rods without holders of assembly panels cook prihvatkoj 18, and bathing welding ready assembly panels and rods incorporate in postroechnyh conditions. From above holders are closed by covers 19 which can serve for bracing of a coating of an envelopment. Connection is executed lined in a holder, or the holder itself serves as a dutchman.

Axes of rods in the offered connections are crossed in the centre of knots thanks to what designs with the accurate settlement scheme are formed. The knot perceives efforts as tensionings and compression, and the moments with transverse forces, developed sectional views in private soldiers and field connections therefore are necessary. Central connections of the given type allow to change a little length of a rod at manufacturing at the expense of a groove in the flattened butt end of rods. They provide a necessary corner of turn at assemblage and manufacturing of assembly panels without infringement of a centering of elements in knots. Otherwise, as rods of domes have various spatial orientation in each of knots, there is a necessity of individual manufacturing of knots and a considerable quantity of standard sizes of central elements.

Developed central connection has passed experimental check at trials of a large-scale model. And fragments of a dome coating (chapters 4 and 5 see).

Fig. 3.6. Variant SH of basic knots of panels of a dome.

Novelty of connections is confirmed by the copyright certificate and

Patents [28,136,137].

Fig. 3.7. Variant IY of connections on an example of basic knots of panels of a dome.

By working out of the constructive decision of a precast geodetic dome (fig. 3.1, 5.3) have been offered also boltovye rigid joints of an one-zone dome (by V variant), carried out on specially developed technique from assembly pyramidal panels which also gather from ready rods and central elements (bevel or cylindrical), same with assembly (fig. 3.8).

Fig. 3.8. Variant Y of connections of tubular rods with the flattened butt ends for pyramidal panels of a dome with a central element in the form of a bevel ring.

For creation of compact knot butt ends of pipes of rods are flattened with excesses under flanges with a carving because of what at elements also it is formed utonenie, facilitating connection of elements under corners of 40-80 degrees.
Here there are developed central junction pieces, in difference, from the previous welded central connections. The central element represents a ring with the milled apertures of two and more numbers which allow to connect rigidly bolts rods under any corners in limits from 45-75 degrees.

The central element can be executed with covers or stiffening fins inside for decrease materialoemkosti connections. Central connection of rods of a dome-cover from wooden kleyonyh elements (fig. 3.9) is similarly executed. Here possibility of the decision of turn in knots by means of cylindrical flanges with a carving, reinforcing bars welded on the ends which then are pasted in wooden elements, or possibility of gluing in of these rods under small corners to lumber fibres is used. Cylindrical flanges with a female thread can be pasted both on a level with butt ends of wooden elements, and in the form of developed flanges, can be left outside and perceive all efforts of compression from pristykovannyh elements (fig. 3.9).

Fig. 3.9. Variant Y of connections of tubular rods with the flattened butt ends for pyramidal panels of a dome with a central element in the form of a bevel ring.

Deflexions of the actual longitudinal and angular sizes of wooden elements from the design should be minimum, therefore manufacturing of elements and integration in assembly panels is recommended to be made in special conductors.

The offered knots (fig. 3.2 - 3.9) possess concerning low labour input of manufacturing (deflexions of the geometrical sizes of elements at manufacturing do not exceed the tolerance of 1,0-3,0 mm) and lowered materialoemkostju at condition observance ravnoprochnosti sectional views in connecting knots.

3.1.2.

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A source: Antoshkin Vasily Dmitrievich. is constructive-TECHNOLOGICAL DECISIONS of PRECAST SPHERICAL SHELLS. The dissertation on competition of a scientific degree of a Dr.Sci.Tech. Saransk - 2017. 2017

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