Types of reinforced concrete purlins. Concrete purlins

In brick buildings, interfloor ceilings are laid from reinforced concrete slabs on walls and crossbars.

Crossbars (girders)(Fig. 1, a, b) rest on reinforced concrete cushions, which are laid in the brick walls along the masonry. The difference in the markings of the top of the pillows within the section of the house should be no more than 10 mm.

Figure 1. Installing the crossbar (purlin): a - type of support on the wall; b - on the pole; 1 - reinforced concrete pillow; 2 - runs

Before the installation of crossbars (girders) calibrate the level of the support pillows with a level. The crossbars are strapped in two loops, fed to the installation site and lowered onto the bed from the solution spread out on the supports. The crossbars are brought to the design position with assembly crowbars. The crossbar can only be moved perpendicular to the longitudinal axis, working with the paw of a crowbar. Otherwise, the stability of the walls or pillars on which the crossbar rests may be impaired. Fitters work from the inventory scaffold. After verifying the horizontal (in level and sighting on the previously installed crossbars), verticality (along the plumb line), the crossbar is attached to the previously installed structures(the method of attachment is indicated in the project) and then the slings are removed.

Before installation slabs check the position of the upper supporting parts of the masonry under the floor structure, which should be in the same plane (the difference in elevations within the floor should not exceed 15 mm).

To ensure the horizontality of the ceiling formed by the overlap, use the following techniques... Within the seizure (section) of the building, along the perimeter of the top of the walls or purlins, using a level or flexible level, risks are applied (on pre-fixed rails) that correspond to the mounting horizon, i.e. the elevation at which the bottom of the floor structures will be located. Along the leveling marks (along the mooring cord), a leveling layer of mortar (screed) is laid, it is leveled with the rule and after the screed acquires 50% strength, slabs (panels) of floors are mounted, spreading a layer of fresh mortar with a thickness of 3-4 mm on the supporting surfaces ...

Figure 2. Laying floor slabs: 1 - a box with a solution; 2 - shovel; 3 - a box with a tool; 4 - scrap; 5 - plate

The installation of the ceiling is carried out by a team of four people: a crane operator, two assemblers (4th and 3rd grade) and a rigger (3rd grade). The rigger straps the slabs with a four-leg sling. Two fitters are on the floor (initially on the scaffold), one at each support of the slab to be mounted (Fig. 2). They take the supplied plate, unfold it and guide it when lowering to the design position.

After alignment, the floor slabs are fixed by welding the mounting loops to the anchors embedded during laying into the walls, the adjacent slabs are fastened with anchors for the mounting loops.

The joins of the floor to the walls are closed after the installation of the floor. In hollow floorings, when resting on the outer walls, in order to isolate the voids, they are filled with lightweight concrete or ready-made concrete plugs to a depth of at least 120 mm. The voids in the slabs resting on the internal load-bearing walls are filled with heavy concrete or liners. This is necessary to protect the supporting parts of the floor slabs from destruction under pressure of the overlying structures.

Jumpers... Bearing lintels in brick buildings, like girders, are installed by lifting by mounting loops and laying on a prepared mortar bed, and ordinary lintels are laid manually. During installation, ensure the accuracy of their installation according to vertical marks, horizontality and size of the bearing area.

Stairways and landings... The elements are mounted as the walls of the building are erected. Before installation landings and marches check their sizes. Then the places of installation of the sites are marked, a layer of solution is applied and the site is installed. The intermediate platform and the first march are installed along the masonry interior walls staircase, second (storey) area and the second march - at the end of the masonry floor.

The staircase is slinged with a four-branch sling with two shortened branches, which give the element to be lifted to a slope slightly more than the design one. When installing flight of stairs it is first supported on the lower platform, and then on the upper one. If the landing of the march on the support pads is carried out the other way around, then it may fall off the upper platform or it may jam between the upper and lower platforms.

Before installing the march, the installers arrange a bed of mortar at the support points of the stairwells, throwing it in and leveling it with trowels. When installing flights, one fitter is on the lower platform, the other on the overlying floor or on the scaffold next to the staircase. Accepting the march, the installer directs it to the staircase, moving simultaneously to the upper landing. At a height of 30-40 cm from the landing site of the march, both installers press it against the wall, give the crane driver a signal and put in place first the lower end of the march, then the upper one. Inaccuracies in the installation are corrected with an assembly scrap, after which the sling is unhooked, the joints between the march and the sites are monolithic with cement mortar, and inventory fences are installed.

Stairways without mounting loops are lifted using a forks.

Balcony slabs ... The installation of balcony slabs is started along the entire length of the grip after laying the floor. First, lighthouse slabs are installed along the edges of the grip, marked on the ceiling and the position of the balcony slab is fixed with risks. On subsequent floors, the position of the marks is additionally monitored along the balcony of the underlying floor, using a plumb line for this. After installing the lighthouse plates, the wire cord-mooring is pulled along their outer upper rib for the length of the entire grip and the rest of the plates are installed along it. Plates are usually slinged with a four-branch sling. The mortar bed is leveled with a trowel, not bringing it 2-3 cm to the edge of the wall. Balcony slabs are laid by two installers, controlling the correct lowering of the slab along the risks and the mooring cord. The board should be laid horizontally or with a slight slope towards the free end. The horizontal position of the slab is checked by laying the rule with a level in two perpendicular directions. With a slope in the longitudinal direction, the slab is raised and lowered again, replacing the mortar bed. The slope towards the building is eliminated when installing temporary racks or rods.

Temporary fasteners are installed immediately after laying the slab. To do this, the racks are placed on the balcony of the underlying floor and, using a screw spacer, they support the slab to be mounted.

The slab remains suspended from the crane hook until a temporary anchorage is installed, the position of the slab is verified and the embedded parts are welded to the anchors. The balcony slabs are fixed by welding steel rods to the mounting hinges of the floor slabs and the balcony.

Reinforced concrete products help to ensure the strength of building structures. Their shapes and sizes are varied. Some produce directly on construction site, others are prepared in production. No construction is complete without reinforced concrete girders.

Definition

Appearance, the structure of the girder is almost the same as that of a reinforced concrete pillar. Outwardly, they look like a frozen concrete solution with metal frame inside. What is the difference between runs? Structures differ in large mass, long and reinforced strength. The production of structures is not put on stream, their release is associated with the need for the element to withstand a certain load.

Appointment

Reinforced concrete girders are used in construction in order to solve an important problem. For example, no opening can be made without using a purlin. Only after its installation are the floor slabs attached. And reinforced products made under the influence heat treatment, can withstand heavy loads. They are used in the construction of public, industrial buildings with brick and reinforced concrete walls... Most often they are used in the construction of openings on which floor slabs are attached.

Installation of the purlin: a) type of support on the wall; b) on a pole; 1.reinforced concrete pillow; 2. runs.

Reinforced concrete girders are prepared exclusively in an industrial way, in accordance with state building codes. For their production, only heavy concrete is used, more often M200 and M300, with the use of reinforcement for reinforcement. The use of structures in favorable conditions increases the service life of buildings.

Views

Reinforced concrete girders are divided into types that are formed according to the shape of the product and the grade of concrete. The following types have been assigned to the runs

T-section

In production, channels and I-beams are used. This type is divided into two types:

The first group includes products with metal located perpendicular to the edge of the purlin. They are suitable for the construction of buildings that have a roof slope of approximately 25%. 1PR is a rod frame, 2PR is pre-stressed, 3PR is used with a roof slope of no more than 5% - varieties of the first group.
The second group includes products that can withstand a roof slope of 25%. It includes products 4PR tense and 5PR artificially created voltage.

These designs can be used for an unheated room. Are applied in temperature conditions from - 40 to 50 degrees and exposure to gas. A characteristic feature is the ability to use products in the construction of structures in hazardous, seismically active zones.

The difference is the presence of special holes, through which the grippers are threaded, the lifting and installation of elements is facilitated. T-section elements are suitable for building construction:

unheated with a roof made of admixture of cement and asbestos fibers;
heated with lightweight ceilings;
heated with a cement roof.

Rectangular section

This type of run has I-beams. The rectangular section of the purlins can be solid and lattice. The lattice type is lighter, the step of placing products is 6 meters, so it is used in construction much more often. For the production of a solid type, bent channels are used. Products with a rectangular cross-section have thin walls, but excellent height. The durability of the products is ensured by specially created folds of fasteners.

Marking

An example of marking purlins.

They approach the manufacture of building structures in compliance with state standards and technology. You can get the maximum information about the product by examining the product series. An inexperienced builder will not be able to get full information on marking without knowledge. It is worth focusing on the decryption data.

For ease of use, a special classification is applied in letters and numbers. They contain encrypted information about the length, height, width, and support load. The first letters contain information about the run series:

P - one-piece product.
PR - the presence of a side located parallel or at an angle to the axis of the element.
PRG - rectangular section.

The second group of symbols contains information about the load and the type of reinforcement. The third signs speak of the specific purpose of the material, including the features of using the concrete composition.

For example: PRG 28-1-3-4t. PRG - rectangular section. The next series of numbers indicates the dimensions of the structure: 2800 mm long, 100 mm wide, 300 mm high. The 4t indicator indicates the ability to withstand a load of 4 tons per meter.

A roof girder is a horizontally placed beam between the supporting structure and the roof batten. Its key functions are the transfer of the load from the roofing, its even distribution in the rafter system, as well as ensuring the rigidity of the sheathing.

The girders are made of wood, steel and reinforced concrete and are used in the construction of roofs for industrial buildings and private houses. They are also installed as foundations for floor slabs and to reinforce openings.

Run in the rafter system

Roofing and construction beams

Before starting construction, study the types of beams to understand how the roof works. Each beam has its own purpose and occupies a certain place in the floor system.

Roof beams are made of metal, solid wood or lamellas glued together. Bent-glued beams are made according to GOST. They are easy to work with, have little exposure to the weather and are used to extend the gaps between runs. The section of the elements can be rectangular, T-shaped or I-beams. The shape of the I-beam (H) guarantees the rigidity of the beam, reduces the bending moment to almost zero.

Broken roof scheme with purlin

Types of timber construction beams in the roof support system:

mauerlat - a square beam laid on the walls to support the rafters;
ridge - a support bar at the top of the roof;
rafter beam - forms the angle of the roof slope;
tightening and crossbar - connect the rafters of opposite slopes;
filly - lengthens the rafters, forming a roof overhang;
brace - is located at an angle to the vertical elements and supports the rafters;
run.

Sheathing scheme from wooden elements

The runs are fixed on supports at a distance of 4-5 meters from the ridge, and expanding supports are placed between them. If you need to lengthen the rafters, the joint is placed over the girder.

The structure and types of metal roof beams:

lower belt
top belt
lattice.

The lattice is assembled from racks and braces and attached to the belts on both sides with the help of shaped elements.

Types of purlins for roofing

Girders are classified according to their location in the roof slab system, as well as shape and material.

Types of application in the truss system

There are three types of girder supports - lateral, ridge and Mauerlat.

Ridge run- this is the highest roof beam, it is mounted in the upper parts of the gable walls, and the edges are wrapped with a waterproof material. If necessary, the structure is reinforced with racks. The rafters rest on the ridge with the upper end.

The ridge fixed in the gables of the walls

Mauerlat or matitsa is a thick timber with a section of 150x150 mm, which is laid on the load-bearing walls parallel to the ridge in order to equally distribute the load from the roof. Mauerlat boards are called the foundation of the roof and are firmly fixed with anchor bolts on the walls, after having laid a waterproofing material. V brick buildings the mat is installed in a pre-prepared reinforced concrete armored belt on the reinforcement.

Mauerlat laid on a concrete wall on top waterproofing material

The side girder connects the rafters in the middle - with its help, the roof is strengthened, reducing the bending load of the rafters. To transfer the load to the floor, install under the side girders vertical posts.

Classification of beams by material

As mentioned above, girder supports are classified by material into reinforced concrete, metal and wood. Metal purlins are produced industrially and can be homogeneous or lattice. The first ones are made of channels and I-beams - they are easy to manufacture and install, cost 10% cheaper than lattice ones. The disadvantage of lattice girders is the high cost and a large number of complex nodal elements. The advantage is low weight.

Runs can be:

whole;
composite.

Composite beams are used when it is necessary to cover the roof large area to avoid distortion from bending loads.

Categories of wooden supports by construction

Structurally, purlins are classified into:

continuous;
split;
with struts;
cantilever-beam;
with bolsters.

Split ones are rows of wooden supports fixed on the roof slopes and resting on supporting structures - pillars. Often secured with struts and struts.

Diagram of cantilever-beam and continuous purlins

Cantilever-beam - these are enfilade rows of boards less than 6.5 m long, the joints of which are located outside the support beams. In this case, two consoles are formed in the middle intervals, and one in the outer ones. Cantilever beams are used in the construction of roofs with a step load-bearing structures up to 4-5 m.

Continuous purlin beams are suitable for roofs with a slope of up to 15 ° and covered with lightweight materials such as roofing felt or shingles. With a greater slope, thin beams cannot withstand bending loads and break.

To strengthen the structure in construction, struts and supports are used:

A bolster is a small block mounted on a support post. The supporting beam of the lathing rests on it.
A brace is an inclined beam that supports horizontal beams and works in compression.

The braces contribute to an even redistribution of loads from the pavement to the supporting elements.

Grouping reinforced concrete purlins by profile

Reinforced concrete girders are marked according to the section shape and load. By cross-section, runs are:

T-shaped;
rectangular.

Reinforced concrete block rectangular

T-type beams are divided into two more groups:

beams with metal perpendicularly attached to the ribs of the purlin - installed on the roof with a slope of up to 25%;
supports that can withstand a roof slope angle of more than 25%.

T-supports are used in the construction of roofs for large unheated rooms, as well as in seismically active regions. They can withstand temperatures as low as -50 ° C. A key feature of T-shaped reinforced concrete supports is the presence of holes for hooks and other grippers, which ensure ease of installation.

Supports of rectangular cross-section - high and thin-walled, strong due to bends. They are classified into solid and lattice.

Gradation of metal components along the profile

Solid metal purlins are curved profile beams of several types:

C-shaped;
I-beam;
Z-shaped;
tavrovy;
channel.

The T-profile in cross-section resembles the letter T, the I-profile - H, and the channel - the letter P.

Types of metal beams with a lattice profile:

bar-truss with a bottom chord and a grating made of round steel;
three-panel.

The three-panel girder is accepted as a typical one due to the smaller number of nodes and ease of manufacture. The upper chord of the beam is made of a double channel, and the lattice is made of curved single channels.

Labeling of industrial products

Runs in construction are critical structures, they are made in strict accordance with GOST and are marked. To select beams that correspond to the purpose of the roof, you need to navigate the product labeling.

Reinforced concrete blocks for roofing

Reinforced concrete girders are marked with letters and numbers, investing in the value information about the dimensions and support load of the products. The letters indicate the series and design features of the girder:

PR - a beam in the form of a brand with a side;
P - one-piece run;
PRG - support of rectangular section.

The numbers indicate the length, width and height of the purlin, and the latter indicates the load that it can withstand, in tons. Also, the marking can include values about the reinforcement of the product. The purlins are either unstressed, reinforced with a steel frame or prestressed, with additional longitudinal reinforcement bars to increase the bearing capacity.

Product dimensions are taken into account when marking

Also, in the production of reinforced concrete structures, markings of the type are used:

1PR - for flat roofs with reinforcement without reinforcement;
2PR - for flat roofs with reinforced fittings;
3PR - for structures with a slope of up to 5%;
4PR - for roofs with a slope of up to 25%;
5PR - with a diagonal shelf for steep roofs.

An example of marking a reinforced concrete run with decoding: PRG 48-2-5-4tAIII-1. This is a rectangular purlin with dimensions of 4800x200x500 mm and a permissible load of 4 tons. It is pre-stressed, reinforced with additional reinforcement. Suitable for the construction of heated and unheated critical structures in areas with poor weather conditions and seismically active areas.

Metal roof elements

Metal beams are marked according to their profile, structure, material and dimensions.

Classification and marking of I-beams:

W - s wide shelf;
K - columnar;
B - ordinary.

The number in front of the letter indicates the nominal height of the beam in mm, the remaining dimensions are selected in accordance with GOST. For example, for support 30B1, the height is 296 mm, and the letter "B" denotes a normal beam. The dimensions of the beams are in the range of 10-100 mm.

Hot rolled purlin production

Metal beams for girders are made of steel by welding or hot rolling - for each manufacturing method, GOST is provided, which describes the marking of products.

Advantages and disadvantages of purlins depending on the material

Going to build a roof compare positive sides and the disadvantages of each material. For example, metal does not provide sufficient energy efficiency for a building, but it is durable. And the tree is subject to decay, but retains heat.

Metal beams in construction

List of pros and cons for metal purlins.

Advantages:

withstand a significant load;
fireproof;
durable;
there is no waste during installation, thanks to the high precision of the parts.

Disadvantages:

freeze when low temperatures Oh;
difficulties in transportation;
heavy weight relative to wood;
expensive material.

Metal is susceptible to corrosion

List of positive and negative characteristics wooden beams.

Advantages:

economical;
easy to install;
retain and transfer heat.

Disadvantages:

annual treatment with antiseptics is required;
there is a risk of fire on the roof.

Below are the pros and cons of reinforced concrete products.

Rafter system made of wood

Advantages:

increased fire safety;
environmental friendliness;
strength and durability;
not subject to corrosion and decay.

Disadvantages:

heavy weight;
laboriousness of installation and fastening of elements.

In private housing construction, roof systems are most often made of wood, and metal elements- girders or crossbars, additionally strengthen the structure. Reinforced concrete blocks are used in the construction of roofs for industrial buildings.

The reliability of the roof does not allow for savings, so be sure to consult with a specialist to clarify all the nuances and get advice specifically on your construction site.

Reinforced concrete girders are reinforced concrete products with high level resistance to bending loads. They perform the function of beams-lintels, rest on the walls of the building and special supports - trusses or crossbars. To move and install the beams, a special lifting technique is used. On their upper edge there are reinforcement loops or through holes with a diameter of up to 5 cm, designed for a secure grip. Installation is carried out on cement mortar with the help of embedded parts.

In the manufacture of this type of concrete goods, dense concrete of grades from M200 to M600 is chosen with high rates of resistance to cracking, fire resistance, frost resistance, and water resistance.

Usage

They are a support for structural elements of administrative, agricultural, industrial buildings, residential complexes made of bricks or blocks. It is these structures that have a large roof area, but an insufficient number of support points for it. Application of beams:

as a base for slabs floor slabs, especially with a weak self-bearing capacity;
strengthening the rafter system;
as above wide doorways, window openings, especially if there is a likelihood of increased loads on them;
in construction flat roofs(slope less than 5%);
as connecting elements between separate parts of a large building;
creation of technological niches.

Types of buildings that are intended to cover reinforced concrete beams:

Unheated, in which the roof is laid directly along the lintels.
Heated, with a roof laid on insulated slabs.
Heated, equipped with light enclosing structures (slope up to 5%).

air temperature not lower than -40 and not higher than + 50C;
seismicity not higher than 7 points;
the effect of the gas environment is not higher than the average aggressive one.

It is permissible to operate them at temperatures below -40 and above + 50C if the requirements for all characteristics of the building structure are met.

Views

According to the form, the runs are classified into:

rectangular - have the form of reinforced concrete pillars of simple rectangular section or with recesses;
T-shaped (in the form of the letter T) - with a shelf for supporting the slab;
with a one-sided shelf (series 1.255.1-3) - have the shape of an inverted letter G.

T-shaped reinforced concrete products are distinguished by the shape of the shelf and the reinforcement:

1ПР - the shelf is at right angles to the rib, non-tensioned reinforcement made of longitudinal rods, intended for use in the construction of buildings with a roof slope of up to 25%;
2ПР - a shelf at a right angle, prestressed reinforcement (reinforced to increase the bearing capacity), also designed for buildings with a roof slope of up to 25%;
3PR - shelf at right angles, prestressed frame, intended for use in the installation of buildings with a roof slope of up to 5%;
4PR - oblique shelf, non-tensioning reinforcement, roof slope 25%;
5ПР - oblique ledge, prestressed frame, roof slope 25%.

Stress reinforcement (frame) during the manufacture of the purlin, before the start of concrete pouring, is subjected to compressive stress at the points where it is expected to experience the greatest tension. Due to such processing, the strength characteristics increase, the resistance to cracking increases, and the consumption of reinforcing steel decreases.

Marking

Purlins marking different shapes has some differences. For rectangular ones, it looks like PRG 40.2.5-4AIII, where:

PRG - rectangular section;
40 - length 4000 mm;
2 - width 200 mm;
5 - height 500 mm;
АIII - type of fittings.

Dimensions indicate product-specific, rounded. If the length of the beam is 4180 mm, then it is called PRG 42. At the end it can be letter designation concrete - t (heavy).

For T-beams of the 1.255-2 series, the marking is as follows - 2PR-1 AtV-N, where:

2ПР - type;
1 - serial number according to the bearing capacity;
AtV - reinforcement class;
H is the characteristic of the permeability of concrete for aggressive substances (in the given example, normal), if at the end instead of the letter H there is P, this means that concrete with reduced permeability is used, suitable for use in a moderately aggressive environment.

Specifications

The main parameter in the selection of concrete girders is their bearing capacity (maximum permissible load). For rectangular products, it is calculated and expressed in kilograms per running meter... For this type, regardless of size, it is equal to 400 kg / r. m.

For T-units, the unit of measurement is kilonewton per meter (kN / m) or kilogram-force per meter (kgf / m). According to GOST, each type (1PR, 2PR, etc.) has a different maximum permissible load. It depends on the reinforcement and the strength class of the concrete. According to this parameter, six types are distinguished: the larger the number denoting the serial number of the run, the greater its bearing capacity.

Estimated permissible load of T-beams 1PR (reinforcement without prestressing):

Concrete grade	Designation in marking
M 200	290	1
M 250	410	2
M 300	560	3
M 350	690	4
M 400	840	5

Product brand	Concrete grade	Steel weight, kg	Designation in marking
2PR	M300	20	370	1
2PR	M300	26	480	2
2PR	M300	32	600	3
2PR	M400	40	770	4
2PR	M400	50	940	5
3PR	M300	17	370	1
3PR	M300	20	530	2
3PR	M300	22	680	3
3PR	M400	31	880	4
3PR	M500	35	1110	5
3PR	M600	38	1340	6

The bearing capacity of other brands of this type of reinforced concrete products can be specified according to the tables from GOST 26992-86.

Dimensions and weight

Rectangular purlins have the following dimensions:

Width - 120 or 200 mm. The marking indicates 1 or 2.
Height - 300, 400 or 500 mm. On the product they are designated 3, 4 or 5.
Length - from 1000 (PRG 10) to 6380 (PRG 64) mm. If necessary, you can pick up almost any size, step - 1-20 cm. Six-meter ones are most in demand.

Weight depending on dimensions - 150-1500 kg.

In addition to marking, a series can be indicated in the characteristics; they are made according to different drawings. The dimensions of the T-section girders and their weight are standard. For grades 1PR, 2PR, 3PR (straight shelf) they are (in mm):

length - 5970;
width - 220;
height - 300 mm;
weight - 500 kg.

For grades 4PR, 5PR (oblique shelf):

length - 5970;
width - 160;
height - 370;
weight - 400 kg.

For brands P, PR:

length - 6280, 5980, 3280, 2980;
width - 420 or 540;
height - 440, 520.

The running beams PR with a one-sided flange can also have a length of 4480 and 8980, a width of 380, a height of 740 mm.

The brand PR (series 1.335):

length - 4540, 5690;
width - 200, 220;
height - 350.

Some manufacturers have the ability to make a batch of products custom size under the order.

Prices

The characteristics on which the cost depends: concrete grade, size and type (series), manufacturer, batch size.

Price for reinforced concrete runs PRG (excluding delivery):

Brand	Price, from rub per piece
17-1,3-4	1900
20-1,3-4	2200
21-1,3-4	2250
22-1,3-4	2300
24-1,3-4	2400
24-1,4-4	3000
25-1,3-4	2500
27-1,3-4	3100
28-1,3-4	1550
30-1,4-4	3100
31-1,4-4	3200
32-1,4-4	3250
34-1,4-4	3300
35-1,4-4	3450
36-1,4-4	2950
37-2,5-4	7500
38-2,5-4	7600
39-2,5-4	7650
40-1,4-4	4375
40-2,5-4	5700
41-2,5-4	7900
42-1,4-4	7950
42-2,5-4	6000
43-2,5-4	8400
44-2,5-4	8500
45-2,5-4	8700
46-2,5-4	9650
47-2,5-4	10100
48-2,5-4	8800
49-2,5-4	10200
50-2,5-4	10400
51-2,5-4	10500
52-2,5-4	10700
53-2,5-4	10700
54-2,5-4	11000
55-2,5-4	11100
56-2,5-4	11400
57-2,5-4	12400
58-2,5-4	11800
60-2,5-4	8300
64-4,4-4	20800

Reinforced concrete girders of the T-section of the 1.255-2 series can be purchased for an amount of 5,000 rubles or more. Products with a single-sided shelf range from:

448 - 9500;
598 - 24 000;
898 cm - 54,500 rubles.

The cost of T-shaped and L-shaped types depends on the same parameters as for the PRG brand.

Reinforced concrete girders of rectangular or T-section are used as supporting elements for slabs, floorings for covering buildings, to strengthen the upper part of openings, and for other purposes. They are made from durable brands concrete, reinforced with a frame made of steel reinforcement. The size range of the running beams makes it possible to use them in the construction of any structures.