Reinforced concrete trusses - dimensions, calculation and production. Reinforced concrete trusses According to the outline of the belt

GOST 23119-78

Group Zh34

STATE STANDARD OF THE UNION OF THE SSR

WELDED STEEL ROOF TRUMS WITH ELEMENTS
FROM PAIR CORNERS FOR INDUSTRIAL BUILDINGS

Specifications

Steel welded roof panties of double angles
for industrial buildings. specifications.

Valid from 01.01.1979
until 01.01.1984*
______________________________
* Expiry date removed
Gosstandart Decree
No. 353 dated 29.02.84. - Note
database manufacturer.

APPROVED AND INTRODUCED BY Decree of the State Committee of the Council of Ministers of the USSR for Construction of April 28, 1978 N 73

REPUBLICATION. November 1979


This standard applies to steel welded truss trusses with elements from paired corners connected into Taurus, with an upper chord slope of 1.5%, intended for industrial buildings with spans of 18, 24, 30 and 36 m:

with rolled and mastic roofing;

with steel and reinforced concrete columns;

with non-aggressive and slightly aggressive environments;

erected in areas with an estimated outdoor temperature of minus 65 ° C and above and seismicity up to 9 points inclusive.

Roof steel trusses must meet the requirements of GOST 23118-78 and the requirements set forth in the relevant sections of this standard.

1. Main dimensions

1. Main dimensions

1.1. Farms should be made in height:

3150 mm - for spans of buildings 18, 24, 30 and 36 m;

2250 mm - for spans of buildings 18 and 24 m.

Trusses with a height of 3150 mm for building spans of 18 and 24 m should be used in buildings in which, along with spans of 18 and 24 m, there are spans of 30 and 36 m, as well as in buildings where, according to the conditions of production technology, an increased height of the inter-truss space is required. In other cases, the choice of trusses in height for building spans of 18 and 24 m is made on the basis of the results of a comparison of the technical and economic indicators of the considered options.

1.2. Schemes and basic dimensions of trusses must correspond to those indicated in Fig.1. It is allowed to use additional elements of the lattice (sprengels, elements for fastening the ways of overhead transport, racks to reduce the estimated length of the main rods of trusses, etc.).

1.3. The division of farms into shipping elements must comply with drawing 2.

SCHEMES AND BASIC DIMENSIONS OF FARMS

DIVISION OF FARMS FOR SHIPMENT ELEMENTS

Trusses for spans of buildings 18 m

a) sent in one element
allowed

Trusses for spans of buildings 24 m

Trusses for spans of buildings 30 m

Trusses for spans of buildings 36 m

2. Technical requirements

2.1. Trusses must be manufactured in accordance with the requirements of this standard, GOST 23118-78 and SNiP III-18-75, according to working drawings of KMD approved in the prescribed manner.

2.2. The maximum deviations of the linear dimensions of trusses and their parts from the nominal ones are given in Table 1.

Table 1

2.3. The limiting deviations of the shape and location of the surfaces of truss parts from the design ones are given in Table 2.

table 2

2.4. The roughness of the machined end surface of the support rib should not be rougher than the first class according to GOST 2789-73.

2.5. The distance between the edges of the lattice details and belts in the truss nodes should be equal to 4-5 gusset thicknesses.

2.6. The upper belts of trusses with a thickness of belt corners of less than 10 mm in the places where reinforced concrete slabs are supported must be reinforced with overlays.

2.7. On the upper plane of the corners of the upper chords of the trusses, in the case of reinforced concrete slabs resting on them, transverse risks should be applied with indelible paint, indicating the center of the node.

2.8. Truss parts, depending on the design temperature, must be made of steel grades given in Table 3.

2.9. Welded joints of truss elements must be made mechanically.

It is allowed, in the absence of equipment for welding by mechanized methods, the use of manual welding.

Table 3

Notes:

1. Steel grades must be accepted according to SNiP II-B.3-72 and SNiP II-28-73.

2. Option 1 or 2 is selected based on the results of comparing their technical and economic indicators.

2.10. Materials for welding should be taken in accordance with SNiP II-B.3-72.

2.11. Trusses must be primed and painted.

Priming and painting must comply with the fifth class of coverage in accordance with GOST 9.032-74.

3. Completeness

3.1. Farms must be supplied by the manufacturer as a complete set.

The kit should include:

sending elements of farms;

mounting gaskets with a thickness of 4, 6 and 8 mm in an amount equal to 85, 65 and 20%, respectively, of the total number of truss support nodes;

technical documentation in accordance with the requirements of GOST 23118-78.

4. Acceptance rules

4.1. Farms (shipping elements) to check their compliance with the requirements of this standard must be accepted by the technical control of the manufacturer individually.

4.2. The control of deviations of the linear dimensions of trusses and their parts (including the cross-sectional dimensions of rolled profiles) from the nominal ones, deviations of the shape and location of the surfaces of parts from the design ones, the quality of welded joints and surface preparation for protective coatings should be carried out before priming the trusses.

4.3. The first and every tenth farm should be subjected to a control assembly.

4.4. The consumer has the right to accept the trusses, while applying the acceptance rules and control methods established by this standard.

5. Control methods

5.1. The control of deviations of the linear dimensions of trusses and their parts from the nominal ones, deviations of the shape and location of the surfaces of parts from the design ones, as well as the roughness of the machined surface should be carried out by universal methods and means.

5.2. The quality control of the seams of welded joints and the dimensions of their sections should be carried out in accordance with SNiP III-18-75.

6. Marking, transport and storage

6.1. Manufactured trusses must be marked.

On each sending element of the farm must be applied:

Order number;

number of the KMD drawing, according to which the sending element of the truss is made;

symbolic designation of trusses according to the KMD drawing indicating the production serial number.

Each package of mounting gaskets must be marked with the order number and the number of the KMD drawing according to which the gaskets are made.

Each mounting gasket must be marked with its thickness.

An example of marking the sending element of the farm:

where 310 is the order number;

5 - KMD drawing number;

B8 - symbol;

6 - serial number of production.

On the sending element of the truss, markings must be applied on the first brace and on the outer plane of the lower chord, as well as on the package of mounting gaskets - at the top and bottom of the package.

Markings must be applied with indelible paint.

6.2. Farms (shipping elements) must be transported and stored in working position. At the same time, the trusses must be supported by wooden linings installed near the nodes, at least 50 mm thick during transportation and at least 150 mm when storing the trusses at the construction site.

The length of the lining must exceed the width of the lower chord of the trusses by at least 100 mm.

During transportation and storage, the reliability of fixing the trusses and their safety from damage must be ensured.

During transportation, the sending elements of farms must be combined into packages. The mass of the package must be agreed with the consumer and not exceed 20 tons.

Mounting gaskets must be bundled with wire.

7. Installation instructions

7.1. Truss installation must be carried out in accordance with the requirements of GOST 23118-78 and SNiP III-18-75.

7.2. Limit deviations from the design position of the mounted structures are given in Table 4.

Table 4

7.3. The displacement of the outer edges of the supporting parts of the reinforced concrete pavement slabs from the transverse marks applied in accordance with clause 2.7 should not be more than 20 mm.

8. Manufacturer's warranty

8.1. The manufacturer must ensure that trusses comply with the requirements of this standard, subject to the conditions of transportation, storage and installation established by this standard.



Electronic text of the document
prepared by Kodeks JSC and verified against:
official publication
M.: Publishing house of standards, 1982

• Trusses are structural elements that, having perceived the load in the span, transfer it to the supports. Metal roof trusses have the form of a lattice through structure, made of rectangular rods, "assembled" with each other into nodes. The choice of their design for a particular roof determines the location of the attic floor, the slope of the roof and the required span.

  Metal roof trusses are mainly made from steel profiles, more often from a corner. For heavier structures, the profile has a tee or I-section, and for hydraulic structures - a round, shaped pipe. Steel truss truss is widely used in structures for covering and overlapping buildings, often with a span width of more than 24 m.

  Metal construction

  The strength and rigidity of these elements of the supporting structure is provided by their shape. The classic version of a metal truss consists of rods - two parallel and another between them, welded in a zigzag manner. Thanks to this arrangement, even with a relatively small consumption of material, the resistance of the metal structure is increased.

  Main structural elements:

  • belts, upper and lower, forming a contour;
  • lattice assembled from braces and racks.

  Nodal connection of elements is performed by direct adjoining one to the other. The lattice rods are fixed to the belts either by welding or by means of shaped elements. In addition to rafters, there can also be rafters. They are used as supports for load-bearing structures and floors, if the distance between the columns exceeds the step of the beams or the columns have an unequal step.

  Types: by belts and lattices
  

  

  They are classified according to the geometry of the belts and the type of lattice.

  According to the belt

  

  • with parallel belts - have enough design advantages. The greatest repeatability of parts, associated with equal lengths of rods for chords and gratings, the same scheme of nodes, a minimum number of chord joints, makes it possible to unify designs, which makes it possible to industrialize their production. They are optimal for soft roofs.

  

  • trapezoidal (single-pitched) - in conjunction with columns, it makes it possible to arrange rigid frame assemblies that increase the rigidity of the building. In the middle of the span, there are no long rods on the lattice of these trusses. They do not require large slopes.
  • polygonal - suitable for heavy structures used for large spans, while they provide significant savings in steel. The polygonal outline for light options is irrational, since the slight savings are not commensurate with the complexity of the design.

  

  • triangular - they are usually used for steep roofs or, based on the operating conditions of the building or the type of roofing material. Although they are simple in execution, they have certain design flaws, for example, the complexity of a sharp support unit, increased consumption of materials in the manufacture of too long rods in the central part of the lattice. The use of triangular systems is mandatory in some cases, for example, in buildings where it is necessary to ensure, on the one hand, a significant and uniform influx of natural light.

  Lattice systems

  • triangular - the most effective in the case of parallel belts and a trapezoidal outline, it is possible to use them in a system with a triangular outline;
  • diagonal - braces, the longest elements, should be stretched, while the racks, on the contrary, should be compressed. Such a lattice, compared with a triangular one, is more laborious and has a greater consumption of material;
  • special - trussed, cross and others.

  Calculation of a triangular farm and its features

  The calculation takes into account the requirements of SNiP for "Steel structures" and "Loads and impacts". It is possible to correctly calculate truss systems made of metal only if you have special knowledge. This takes into account numerous factors, so designers, as a rule, turn to the help of special programs when calculating.

  What underlies the calculations of a triangular truss: an example

  Farms are under the constant influence of loads such as the weight of the roof, skylights, suspended gutter systems, fans, the own weight of the supporting structure, and others. The temporary loads include the pressure of wind, snow, the weight of people on the roof, suspended transport.

  On a note

  The wind load is taken into account with the slope of the farm, starting from 30⁰.

  Special or periodic loads are also taken into account, such as seismic, hurricane, etc.

  Calculation example in SCAD program

  Fabrication and connection of elements

  

  • Assembly. They are assembled in stages from parts on tacks.
  • A bunch of belts is produced using one or two paired corners:
  • the upper belts are made of unequal two corners having a tee section, docking is carried out on the smaller sides;
  • for the lower belts, respectively, isosceles corners are used.
  • If the element is long, use connecting and patch plates. In the case of loads formed within the boundaries of its panels, paired channels are used.
  • The angle of installation of the braces is 45°, and the racks are 90°. For their manufacture, isosceles corners are used, fastening the elements by means of plates. The corners in the section are either cruciform or tee.
  • Fully welded systems are made using brands.
  • Welding. When the assembly on tacks is completed manually or semi-automatically, welding is performed, after which each seam is cleaned.
  • Coloring. At the final stage, holes are drilled and coated with anti-corrosion compounds.

  Some device rules
  

  The type and design of metal rafters largely depends on. Consider the relationship between the roof slope and the arrangement of truss systems:

  • 6–15° – trapezoidal truss, height 1/7–1/9 of its length. To equip the attic, either its walls must have an appropriate height, or the projected roof must have fractures at the supports. The size of the panels of the lower and upper chords must be the same. To make it easier, use a grid.
  • 15–22 ° - the height of the metal structure is equal to 1/7 of the length, the lower belt should be broken - this allows you to reduce weight compared to the usual triangular order of 30%. In this case, one span in length should not exceed 20 m.
  • 22–30° – triangular system, height 1/3 of length. Since its weight is relatively small, external walls erected to a small height can serve as a support.

  

  (7.1 MiB, 5028 hits)

  Description

  Title of the document:	Series 1.263.2-4
  Document type:	Series
  Document status:	Active
  Name:	Issue 1. Trusses with spans of 18, 21 and 24 m from rolling corners. KM drawings
  Summary:	1.263-2-4.1KM-1-3 Technical description 1.263-2-4.1KM-4 Truss diagrams with node marking. Breakdown of farms into shipping marks 1.263-2-4.1KM-5 Diagrams of the arrangement of trusses with a span of 18 m and connections 1.263-2-4.1KM-6 Diagrams of the arrangement of trusses with a span of 21 m and connections 1.263-2-4.1KM-7 Layout diagrams of trusses with a span of 24 m and ties 1.263-2-4.1KM-8 Scheme of trusses with marking of elements 1.263-2-4.1KM-9 Truss assortment with span L=18 m and H=1.2 m 1.263-2-4.1KM-10 Truss assortment with span L=18 m and H=1.8 m 1.263-2-4.1KM-11 Truss assortment with span L=21 m and H=1.8 m 1.263-2-4.1KM-12 Truss assortment with span L=24 m and H=1.8 m 1.263-2-4.1KM-13 Schemes of vertical connections B-1, B-2 1.263-2-4.1KM-14 Node 1 1.263-2-4.1KM-15 Knot 2.3 1.263-2-4.1KM-16 Node 4 1.263-2-4.1KM-17 Knot 5 1.263-2-4.1KM-18 Node 6 1.263-2-4.1KM-19 Node 7 1.263-2-4.1KM-20 Knot 8 1.263-2-4.1KM-21 Node 9 1.263-2-4.1KM-22 Knot 10 1.263-2-4.1KM-23 Node 11 1.263-2-4.1KM-24 Knot 12-15 1.263-2-4.1KM-25 Instructions for the calculation of welded joints of truss units 1.263-2-4.1KM-26 Marking holes along the upper chords of trusses for fastening ties 1.263-2-4.1KM-27 Layout of reinforced concrete slabs and details of their welding to truss belts 1.263-2-4.1KM-28 Specification of steel trusses with a span of 18 m 1.263-2-4.1KM-29 Specification for steel trusses with a span of 21 m 1.263-2-4.1KM-30 Specification of steel trusses with a span of 24 m
  Date added to database:	01.09.2013
  Date of update:	01.12.2013
  Introduction date:	01.12.1982
  Organizations:	Designed Approved: State Committee for Civil Engineering and Architecture under Gosstroy of the USSR 10/13/1982

  (8.8 MiB, 1902 hits)

  Description

  Title of the document:	Series 1.263.2-4
  Document type:	Series
  Document status:	Active
  Name:	Issue 2. Farms with a span of 27, 30 and 36 m from rolling corners. KM drawings
  Summary:	1.263-2-4.2KM-1.1-1.3 Technical description 1.263-2-4.2KM-2 Truss schemes with node marking. Breakdown of farms into shipping marks 1.263-2-4.2KM-3 Layout of trusses with a span of 27 m and connections 1.263-2-4.2KM-4 Diagram of the arrangement of trusses with a span of 30 m and connections 1.263-2-4.2KM-5 Layout of trusses with a span of 36 m and connections 1.263-2-4.2KM-6 Truss diagrams with element marking 1.263-2-4.2KM-7 Assortment of trusses with span L=27 m; H=1.8 m 1.263-2-4.2KM-8 Truss assortment with span L=27 m; H=2.1 m 1.263-2-4.2KM-9 Truss assortment with span L=30 m; H=1.8 m 1.263-2-4.2KM-10 Truss assortment with span L=30 m; H=2.1 m 1.263-2-4.2KM-11 Truss assortment with span L=36 m; H=2.1 m 1.263-2-4.2KM-12 Truss assortment with span L=36 m; H=2.4 m 1.263-2-4.2KM-13 Schemes of vertical connections B-1, B-2; B-3 1.263-2-4.2KM-14 Node 1 1.263-2-4.2KM-15 Knot 2.3 1.263-2-4.2KM-16 Node 4 1.263-2-4.2KM-17 Node 5 1.263-2-4.2KM-18 Node 6 1.263-2-4.2KM-19 Node 7 1.263-2-4.2KM-20 Knot 8 1.263-2-4.2KM-21 Knot 9 1.263-2-4.2KM-22 Knot 10-13 1.263-2-4.2KM-23 Instructions for the calculation of welds in truss nodes 1.263-2-4.2KM-24 Marking holes along the upper chords of trusses for fastening ties 1.263-2-4.2KM-25 Layout of reinforced concrete slabs and details of their welding to truss belts 1.263-2-4.2KM-26 Specification of steel trusses with span L=27 m; H=1.8 m 1.263-2-4.2KM-27 Specification of steel trusses with span L=27 m; H=2.1 m 1.263-2-4.2KM-28 Specification of steel trusses with span L=30 m; H=1.8 m 1.263-2-4.2KM-29 Specification of steel trusses with span L=30 m; H=2.1 m 1.263-2-4.2KM-30 Specification of steel trusses with span L=36 m; H=2.1 m 1.263-2-4.2KM-31 Specification of steel trusses with span L=36 m; H=2.4 m
  Date added to database:	01.09.2013
  Date of update:	01.12.2013
  Introduction date:	01.03.1983
  Available for viewing now:	100% text. Full version of the document.
  Organizations:	Designed: TsNIIEP im. B.S. Mezentsev Gosgrazhdanstroy Accepted: MADI of the Ministry of Higher Education of the USSR (Moscow Automobile and Road Institute) Accepted: President of Russian Federation Accepted: CITP Gosstroy of the USSR Approved: State Committee for Civil Engineering and Architecture under the Gosstroy of the USSR 01/04/1983

  (11.6 MiB, 2454 hits)

  Description

  Title of the document:	Series 1.263.2-4
  Document type:	Series
  Document status:	Active
  Name:	Issue 3 KM drawings
  Summary:	1.263-2-4.3KM-1.1-1.4 Technical description 1.263-2-4.1KM-2 Truss diagrams with node marking. Breakdown of farms into shipping marks 1.263-2-4.1KM-3 Layout of trusses with a span of 18 m, purlins and ties 1.263-2-4.1KM-4 Layout of trusses with a span of 21 m, girders and ties 1.263-2-4.1KM-5 Layout diagrams of trusses with a span of 24 m, purlins and ties 1.263-2-4.1KM-6 Layout diagrams of trusses with a span of 27 m, purlins and ties 1.263-2-4.1KM-7 Layout diagrams of trusses with a span of 30 m, runs and ties 1.263-2-4.1KM-8 Layout diagrams of trusses with a span of 36 m, purlins and ties 1.263-2-4.1KM-9 Scheme of trusses with marking of elements 1.263-2-4.1KM-10 Truss assortment with span L=18 m; H=1.2 m 1.263-2-4.1KM-11 Truss assortment with span L=18 m; H=1.8 m 1.263-2-4.1KM-12 Truss assortment with span L=21 m; H=1.8 m 1.263-2-4.1KM-13 Truss assortment with span L=24 m; H=1.8 m 1.263-2-4.1KM-14 Truss assortment with span L=27 m; H=1.8 m 1.263-2-4.1KM-15 Truss assortment with span L=27 m; H=2.1 m 1.263-2-4.1KM-16 Truss assortment with span L=30 m; H=1.8 m 1.263-2-4.1KM-17 Truss assortment with span L=30 m; H=2.1 m 1.263-2-4.1KM-18 Truss assortment with span L=36 m; H=2.1 m 1.263-2-4.1KM-19 Truss assortment with span L=36 m; H=2.4 m 1.263-2-4.1KM-20 Schemes of vertical connections V-1…V-4 1.263-2-4.1KM-21 Node 1 1.263-2-4.1KM-22 Knot 2.3 1.263-2-4.1KM-23 Node 4 1.263-2-4.1KM-24 Node 5 1.263-2-4.1KM-25 Node 6 1.263-2-4.1KM-26 Node 7 1.263-2-4.1KM-27 Knot 8 1.263-2-4.1KM-28 Node 9 1.263-2-4.1KM-29 Knot 10 1.263-2-4.1KM-30 Node 11 1.263-2-4.1KM-31 Knot 12-15 1.263-2-4.1KM-32 Instructions for the calculation of welded joints of truss units 1.263-2-4.1KM-33 Marking holes along the upper chords of trusses L = 18-24 m for fastening ties 1.263-2-4.1KM-34 Marking holes along the upper chords of trusses L = 27-36 m for fastening ties 1.263-2-4.1KM-35 Tables for the selection of grades of purlins and the profile of the dimensions of the flooring 1.263-2-4.1KM-36 Specification of steel trusses with span L=18 m; H=1.2 m; H=1.8 m 1.263-2-4.1KM-37 Specification of steel trusses with span L=27 m; L=24 m; H=1.8 m 1.263-2-4.1KM-38 Specification of steel trusses with span L=27 m; H=1.8 m; H=2.7 m 1.263-2-4.1KM-39 Specification of steel trusses with span L=30 m; H=1.8 m; H=2.1 m 1.263-2-4.1KM-40 Specification of steel trusses with span L=36 m; H=2.1 m 1.263-2-4.1KM-41 Specification of steel trusses with span L=36 m; H=2.4 m
  Date added to database:	01.09.2013
  Date of update:	01.12.2013
  Introduction date:	01.08.1983
  Available for viewing now:	100% text. Full version of the document.
  Summary:	1.263-2-4.4-00KM Technical description 1.263-2-4.4-01KM Truss schemes with node marking. Breakdown of farms into starting marks 1.263-2-4.4-02KM Plans of arrangement of trusses with a span of 15.18 m and ties 1.263-2-4.4-03КМ Plans of arrangement of trusses with a span of 21.24 m and connections 1.263-2-4.4-04КМ Plans of arrangement of trusses with a span of 27.30 m and connections 1.263-2-4.4-05KM Truss schemes with element marking 1.263-2-4.4-06KM Assortment of trusses with a span of 15.18.21 m 1.263-2-4.4-07KM Assortment of trusses with a span of 24 m 1.263-2-4.4-08KM Assortment of trusses with a span of 27 m 1.263-2-4.4-09KM Assortment of trusses with a span of 30 m 1.263-2-4.4-10KM 1.263-2-4.4-11KM Node 1.2 1.263-2-4.4-12KM Node 3…8 1.263-2-4.4-13KM Truss support units (options) 1.263-2-4.4-14КМ Fragments of the flooring plan with the location of fasteners 1.263-2-4.4-15KM Permissible design load on decking 1.263-2-4.4-16KM

Reinforced concrete trusses are used for spans of 18, 24 and 30 m (rarely 36 l); subdivide them into segmental, arched, triangular, trapezoid and with parallel belts (Fig. 64). Depending on the manufacturing method, trusses can be solid, from semi-trusses, from blocks 6 m long and from individual elements.

Segmental, arched and polygonal trusses are designed for roofing with rolled roofing, triangular - under the roof of asbestos-cement and metal corrugated sheets. Farms with parallel belts are used in buildings with a flat coating under a rolled “dry” or water-filled roof.
To avoid a large slope of the roof in the extreme panels on the supports of the segmental trusses, small posts are provided to support the roof panels. Truss step 6 and 12 l (rarely 18 m).

The truss lattice allows to support panels with a width of 1.5 and 3 m. When the panels are supported off-node, the upper chord is additionally reinforced to absorb forces from local bending. Most pitched trusses have support nodes 0.8 m high.
Farms are made of concrete grades 300-500. The lower belt is prestressed and reinforced with bundles of high-strength wire. To reinforce the upper belt, braces and racks, welded frames made of hot-rolled steel of a periodic profile are used. In fems, embedded elements are provided, similar to beams.

The most rational in terms of material distribution are segmental and arched trusses with a broken or curvilinear upper belt. Compared to others, they have lower forces in the lattice elements and smaller bending moments in the upper chord from out-of-nodal loading, which makes it possible to make the lattice more sparse. Segment and arch trusses have a small height on the support, which allows to reduce the height of the walls; however, the curvilinearity of the upper chord complicates the formwork and reinforcement.

Rice. 64. Reinforced concrete roof trusses:

The configuration of the top chord of the trapezoidal trusses is simple, they are interchangeable with steel trusses. The disadvantages of such trusses include: a relatively powerful lattice, a large height on the support, which requires the installation of vertical connections between the trusses in the plane of the support posts; these trusses are somewhat heavier than segment trusses.
Compared to others, trusses with parallel belts consume more materials, but the formwork used for their manufacture is simple and less labor intensive.

The trusses are fastened to the columns and to the sub-rafter structures with anchor bolts and welding of embedded supporting elements (similar to the fastening of reinforced concrete beams).

When erecting typical industrial buildings of the Molodechno type (development of the State Design Institute LENPROEKTSTALKONSTRUKTSIYA of the Gosstroy of the USSR), welded steel truss trusses of grades FS-18-2.4 and others are used in accordance with GOST 27579-88 “Steel truss trusses from bent-welded profiles of rectangular section. Specifications".

These light roof trusses are designed for the construction of heated buildings with spans of 18, 24 and 30 m with a roll or mastic roof on steel profiled sheets in I - IV regions according to the wind speed (normative wind load up to 48 kgf / m²) and in I - IV areas by snow cover weight (normative snow load up to 150 kgf/m²) with design load on the truss from 1.3 (FS-30-1.3) to 4.3 tf/m (FS-18-4.3). Overhead cranes (groups of operating modes 1K - 6K according to GOST 25546-82) and overhead cranes with a lifting capacity of up to 5 tons can be operated in these buildings.

Double-pitched trusses of the FS type according to GOST 27579 with a slope of the upper belt of 1.5% are used in non-running coating of industrial buildings with profiled steel flooring 57, 60 and 75 mm high according to GOST 24045 with a truss step of 4 m, as well as with a flooring 114 mm high at a step farms 4 or 6 m (clause 1.2.1 GOST 27579).

Steel roof trusses in accordance with GOST 27579 from closed bent-welded profiles of rectangular section according to TU 36-2287-80, with a triangular lattice with descending support braces, are manufactured according to working drawings of the type series 1.460.3-14. The height of steel trusses along the outer edges of the chords is 2000 mm, the distance between nodes along the upper chord is 2964 mm. The wall thickness of bent-welded profiles is from 3 to 8 mm. The upper chord (VP) is made from a profile with a cross section of 180 × 140 mm, the lower chord (NP) - from a profile with a section of 140 × 140 mm, support braces (P1 and P2) - from a profile of 120 × 120 mm, middle braces (P3 - P10 ) - from a profile of 100 × 100 mm, C-pillars - from a profile with a section of 80 × 80 mm. Belts (upper belt VP, lower belt NP) and support braces (P1 and P2) are made of steel 09G2S-12 according to GOST 19282 (steel S345-3 according to GOST 27772), middle braces (P3 - P8) and posts C are made of steel St3sp5 according to GOST 380 (S255 steel according to GOST 27772) (clause 1.3.1 and table 4 appendix 2 GOST 27579).

Welded factory connections of truss elements are performed by mechanized welding in a carbon dioxide environment or in a mixture of it with argon according to GOST 14771 using welding wire grade PP-AN-8 according to GOST 2246 or according to GOST 26271 (clause 1.3.6 GOST 27579).

The nomenclature of steel roof trusses according to the series 1.460.3-14 (with a slope of the upper chord 1.5%)

• FS-18-2.4 (with design load 2.4 tf/m)

• FS-24-1.5 (with design load 1.5 tf/m)

• FS-30-1.3 (with design load 1.3 tf/m)

The nomenclature of steel roof trusses according to the series 1.460.3-23.98.1 (with a slope of the upper chord 10%)

Truss trusses with a span of 18 m:
• FS-18-2.2 (with design load 2.2 tf/m)

Truss trusses with a span of 24 m:
• FS-24-2.0 (with design load 2.0 tf/m)

Truss trusses with a span of 30 m:
• FS-30-1.7 (with design load 1.7 tf/m)

We manufacture the following standard metal products:

Marching stairs, platforms, ladders, ladders and their railings according to series 1.450.3-7.94.2:

• Steel staircases of LGF type with solid corrugated steps
• Steel platforms of the PGF type with continuous corrugated flooring
• Steel staircases of the LGV type with lattice steps made of perforated
• Steel platforms of PGV type with perforated grating