SU916694A1 - Skylight roof - Google Patents

Description

The invention relates to the construction of, in particular, to lantern coverings of industrial buildings.

Known lantern cover industrial buildings with longitudinal background, ryami U-shaped type [1].

The disadvantage of such coatings is the large labor and material costs of the device lantern, which increases, in addition, the load on the truss structure. The large building height of roof trusses increases the volume of the building, which requires an increased consumption of operating costs for heating and ventilation.

These drawbacks are eliminated in the lantern coating, including roof beams, reinforced by a lantern design [2].

However, this solution also has disadvantages and they are as follows. Elements of the lamp construction within the width of the lamp form a form with braces, the lower belt of which is the middle part of the truss beam. The upper belt and the lattice elements of this truss perceive normal effort.

At the same time, the lower farm belt,

2

perceiving stretching, also works on bending, with the maximum magnitude of the bending moment

with formed at the edge of the lantern. Consequently, in accordance with the variable plot of the bending moments, the height of the truss beam can also be variable. However, the device of variable height of the beam causes structural and technological complications that are not compensated by the savings in material intensity. As a result, such coatings are limited to small spans of 12-13 m.

At the same time, while increasing the span of the building (for example, up to 24.30 36 m), the adoption of the variable height of the beam does not provide all the possibilities for reducing its material consumption, so

20 _Κ3 κ within the width of the lantern, where the beam works in tension with bending, the length of this section is very significant.

The purpose of the invention is to reduce material intensity due to the redistribution of forces in the elements of the lamp farm.

This goal is achieved by the fact that in the lantern cover, including

30 truss beams placed in

3

016694

four

the middle of their span is a U-shaped longitudinal lantern structure in the form of a truss with braces and a lower belt in the form of a middle part of the truss beam, and a covering plate laid on the upper belts of the beams and trusses 5; each end part of the beam is made of a variable height with the greatest height in the butt end the lantern truss, while the lantern truss is supported on the upper and lower points of the end face Yu of each end part of the beam with at least two braces.

FIG. 1 shows a variant of the cross section of a 24 m span; in fig. 2 is the same? on fig.Z - 15

the same, a span of 36 m; in fig. 4 the same.

The coating includes truss beams consisting of two end parts 1 and one middle part 2, a truss truss 3 with braces 4 and 5 attached to the upper 6 point of the end of the end part of the beam and lower point 7, plate 8 of the cover.

The construction beam in the end 25 of part 1 at the end of the lamp-side truss is made with thickenings in cross section, and to this thickening attached to the top. 6 parts and 7 lower parts at least two truss braces, respectively, to the upper one - diagonal 4, and to the lower one - diagonal 5.

The lantern structure 3 reinforces the rafter beam and, together with it, forms, within the width of the lantern 35, a truss at which there are at least two extreme nodes and intermediate nodes 7 in the lower zone (Fig. 2). Consequently, the total number of nodes on the 40 lower zone of the truss is at least four.

The work of the truss construction of the proposed solution has very few features. 45

The rafter beam in the area between its ends and nodes 6 perceives only flexural forces, the maximum value of which occurs at nodes 6. In the areas between nodes 50 and intermediate nodes, the rafter beam, in addition to working on bending, also works in tension, while bending the moments decrease towards the nodes b, where 55 they can practically be reduced to zero. The rest of the rafter (between nodes 7) perceives tensile forces, i.e. works like a lower chord in a conventional single-span farm. All other elements of the lamp construction also work only for normal efforts. In the drawing, the layout options farm lattice,

formed by the lamp construction and the truss beam, are special cases of the whole variety of such an arrangement.

The effectiveness of the invention consists in reducing the material consumption of the truss structure due to its more rational work, i.e. by ensuring that the middle part of the truss beam works only in tension - instead of stretching with a bend. At the same time, the material consumption of the truss structure as a whole will decrease, depending on the span of the building, from 20 to 30%. When using a lantern cover with typical spans of 24.30, 36 m, the width of the lantern can be increased, based on the conditions of the best lighting of the building. At the same time, the device of the optimal width of the lamp does not require at all the labor and material costs associated with the broadening of the structure of the lamphouse.

In addition, an increase in the width of the lantern improves the work of the truss structure as a whole, since the length of the end sections of the truss beam working on bending is reduced and the snow bags are moved away from the middle part of the span to the supporting sections, which also facilitates the work of the truss structure.

Claims (1)

Claim A lantern covering, including truss beams with a U-shaped longitudinal lantern structure in the middle of their span, in the form of a truss with braces and a lower belt in the form of a middle part of the truss beam, and covering plates laid on the upper belts of beams and trusses, that, in order to reduce material consumption by redistributing the efforts in the elements of the lamp-house truss, each end part of the beam is made of a variable height with the greatest height at the end of the lamp-house, while the lamp-head farm is supported on the upper and The end points of each end part of the beam are at least two bracings.