Stair step hp 12 wt. Prefabricated concrete staircase along the stringers from the channel. The price of reinforced concrete steps

For the arrangement of flights of stairs often used precast concrete steps. They are distinguished by an affordable price and good performance. Products manufactured exactly according to the requirements of GOST will be wear-resistant and safe. To designate the main staircase steps, the LS marking is used. The numbers following this abbreviation indicate the length of the product. When the marking of the stage LS 15 is given, this means that the main parts are 1500 mm long. Next, we will talk about the features of the steps of LS 12 and other markings, as well as the scope of their application.

Marking value

In addition to the main ones, frieze steps will also be required for the construction of the march - the upper one (LSV) and the lower one (LSN). Internal and external staircase structures are sometimes lined with overhead reinforced concrete treads, designated LN. Products can have both smooth and rough surfaces. Smooth steps are used without additional processing. Rough are used for tiling, stone slabs and other materials.

Scope of application of reinforced concrete products

Stair structures both inside the building and outside can be equipped with reinforced concrete steps. They are applicable for different rooms where marches of non-standard sizes are required. They can also be used for arranging lifting with height differences. Reinforced concrete parts can be operated at an air temperature of at least -40 degrees.

Stair elements are made of different types of concrete: light, heavy or silicate.

The class of material for the construction of external structures should be at least B25, for other spans - at least B15.

Depending on the direction of rise (clockwise or counterclockwise), the steps are made in the left or right version.

Design features

The indisputable advantage of such products is the ease of installation. However, they are resistant to heavy loads. They are installed on load-bearing elements pre-mounted along the edges of the planned march.

All concrete steps are divided into several categories:

• with reinforcing mesh and embedded elements;
• without reinforcing mesh with embedded elements;
• with reinforcing mesh without embedded elements;
• without reinforcing mesh and without embedded elements.

Concrete steps are made with embedded elements intended for fastening fences, and without them. Sockets are provided for fixing railings of a different configuration. For reinforcement, rods and reinforcing wire are used.

Reinforced concrete marches are distinguished by an affordable price. They can be called a practical and economical option. When following technological standards, it is possible to build not only straight flights of stairs, but also screw structures. Steps LS 15 are suitable for creating a front span of large width.

The price of reinforced concrete steps

The table below collects data on stair steps with reinforcing mesh without embedded elements. The following are figures for weight, size and price.

Steps with a height of 145 mm are intended for marches with a slope of 1: 2. For such structures, products with a height of 125 mm are also provided. If the height is 143 or 168 mm, such products are used to equip steep marches with a slope of 1: 1.5. It can be steps for the office space or to the attic.

General rules for a flight of stairs

According to the rules, the number of steps in a flight of stairs can vary from 3 to 18. Mandatory requirements are the same height and sufficient lighting. The length of the march should also not exceed the established limit. Although the main purpose of the staircase is to provide a comfortable and safe ascent, the design in the form will give the room comfort.

Main staircase ( HP 12 ) - a reinforced concrete element of a flight of stairs, which is used to create external and internal flights of stairs of non-standard sizes. Such flights of stairs are created in buildings for various purposes - both industrial and residential, private and public construction. As well as the main steps of the LS, they are used to compensate for irregular height differences at the entrances of houses, pedestrian areas and shop porches.

The norms and standards for the manufacture of stair main steps are laid down in GOST8717,1-84 . Design drawings are contained in Series 1.155-1. release 1.

The LS step can be made of either light or heavy, or dense silicate concrete. The main stage is available in lengths from 900 mm to 2200 mm and widths of 290, 340 and 380 mm. The mass of one step is from 83 to 245 kg, depending on the length and reinforcement of the product. A ladder step, the length of which is 1050 mm or less, is designed for a load of 390 kg / m2, and all other steps can withstand up to 520 kg / m2.

The main step, which has a height of 124 or 148 mm, is designed for stairs with a slope of 1:2. A step with a height of 142 or 171 mm is intended for flights of stairs, the slope of which is 1: 1.5 - such reinforced concrete stairs are placed in basements, service or attic stairs. Such stairs are steeper, and, therefore, occupy a significantly smaller area.

In the manufacture of the LS stage, the product is reinforced with welded wire meshes. Steps with a length of 1050 or less are simply not reinforced.

The main step must have corrosion-protected mounting loops and embedded products for stair railings and railings, designed for fastening railings. In the event that barriers of a different design, the product must have nests.

The step has at least 15 mm of the upper decorative layer of concrete or synthetic indelible material on the front side. The product may have a mosaic layer of marble chips, or have a concrete surface of colored cement. This layer serves not only to reduce the abrasion of the steps, but also for the aesthetic appeal of the stairs and the safety of the ascent.

Steps LS 12 can withstand loads well at any temperature (but not lower than -40 C), and in areas with seismicity up to 9 points, in non-aggressive gas environments. The working surface of the concrete step, at the request of the customer, can be polished for a more attractive design.

If in the design of a flight of stairs the movement "clockwise" or "counterclockwise" is of fundamental importance, then the step is made in the right and left versions.

Concrete for steps of internal rooms of brand from B15, and from brand B25 for steps of external stairs. Frost resistance of the stairs is not lower than F50.

Stairs assembled from the main steps of the LS are often used as a base, which is later lined with porcelain stoneware, ceramic tiles or other decorative materials - this allows the use of reinforced concrete steps even inside residential premises.

Product marking

The conditional designation of the LS stage is an alphanumeric group.

In the first group, the step type and rounded dimensions are indicated. In this case, if the step is 142 or 171 mm high, both the length and height will be indicated in the stamp, and if the step height is 148 or 124 mm, only the length.

The second group contains:

• the presence of embedded products or nests in the step (in numbers);
• L - possible left version of the stage;
• type of finishing of the upper front surface of the step (G - smooth, W - polished mosaic);
• M - for steps used in areas with a design temperature below minus 40 ° C;
• P - for increased aggressiveness of environments.

For example, consider the main stage ( 1200X 380X 190mm), Where:

• LS - stage type - main;
• The number is the length;
• The number is the height.

The marking should be looked for on the non-front side of the steps.

Product quality control

The main stair step should not have cracks - this both reduces its service life and can threaten the safety of those climbing. Only cracks no more than 0.1 mm wide, which were formed during the shrinkage of concrete during the production of the stair main step, are not considered a defect.

The straightness of the step should be as close as possible to the design, that is, deviate by no more than 2 mm. Along the length of the step, LS 12 cannot be further from the size by ± 5 mm and ± 2. In the case of the most significant curvature, the flight of stairs may be defectively assembled and be unsafe for use.

The concrete surface category for the front side of the step must be at least A2. And for polished steps A0. The uniform coloring of all steps of the batch is also controlled so that the appearance of the structure is harmonious.

On acceptance tests the main staircase steps are checked indicators:

• class of concrete in terms of strength and tempering strength of concrete of the main steps of the LS;
• conformity of reinforcing and embedded products;
• strength of welded joints;
• accuracy of geometric parameters;
• quality of the concrete surface of the main steps of the LS;
• concrete cover thickness to reinforcement,
• widths of possible cracks cracks;

Technical certificate, accompanying the batch of main steps, must contain information on: the date of manufacture of the batch of stair steps, the number of products, the results of strength tests; information about the brand of concrete and compressive strength, as well as the class of concrete for frost resistance and calculated abrasion. As a rule, the quality passport contains an indication of the state standard according to which the concrete steps were produced.

Transport and storage

Concrete stair steps, as products on the safety and appearance of which the comfort of the building depends, must be transported most carefully and unloaded carefully (not in bulk or dropping), the slings of the forklifts must have a soft coating. The ladder steps of drugs are transported packed in bags or containers. If the stairs are stored without containers, then they are stacked close to each other, adding a spacer between each step.

Installation of stairs

However, one of the main stairs during the construction of a flight of stairs is indispensable. The main steps are used together with the upper and lower frieze steps (LSV and LSN) - they begin and end the staircase.

Reinforced concrete stairs from individual elements are mounted on a pre-prepared foundation or supports. Individual steps are very easy to install and can withstand heavy loads, so they do not necessarily need a solid base under them, two supports at the edges are enough. Stair steps are used in large-panel and frame-panel buildings and auxiliary buildings of industrial enterprises, and a stair step is also used in private construction during the construction of non-standard spans.