GOST 12767-94 Solid reinforced concrete floor slabs for large-panel buildings. General technical conditions

During the construction of any structure, a reinforced concrete floor slab is often needed. The price of such stoves is not so high, but the benefits from its operation are enormous. there is a need to operate floor slabs. For construction work, floor slabs in accordance with GOST must be used.

Dimensions of floor slabs 1.2 (m) wide

Marking

Marking of hollow core PCs involves the use of 3 alphanumeric groups, separated by hyphens:

• type, length and width of the slab;
• load-bearing capacity, steel class and type of concrete (L - light, S - silicate);
• additional characteristics and design features.

Sliced ​​slabs can be marked with the abbreviation PPS or PB. Marking of ribbed floor slabs includes:

• geometric dimensions and weight of the slab;
• bearing capacity coefficient;
• type and class of fittings;
• type and brand of concrete;
• additional properties of the product.

In conclusion, it is worth emphasizing that the stability, strength and service life of any structure will largely depend on the correct choice of floor slabs. You also need to decide where and from whom you should purchase floor slabs. Because competent production of reinforced concrete products guarantees the quality and durability of your building.

Dimensions of floor slabs 1.5 (m) wide

Main characteristics of floor slabs

According to GOST, PC floor slabs are divided into 3 types: hollow, threaded and ribbed. Each of the listed PC options has its own technical characteristics and features. Hollow-core floor slabs according to GOST are distinguished by many longitudinal voids. Due to this feature, the weight of the structure is reduced and its thermal insulation properties are improved.

Threaded floor slabs according to GOST must be produced on special stands. They have arched voids. Such panels are intended for arranging interfloor structures at objects of any purpose.

This type of panels has excellent performance characteristics. They are ensured through the use of special production technology. To form the slabs, concrete M400-M550 with water resistance W2 and frost resistance F50 is used. Additionally, stressed steel reinforcement is used. It provides the necessary strength properties of the slabs.

Ribbed floor slabs PB according to GOST are distinguished by reinforced edges. For this, special beams are used. Among other characteristics of these products, high load-bearing capacity should be noted. Thanks to this feature, ribbed slabs are used during the construction of multi-story structures.

Dimensions of floor slabs 1 wide (m)

Decoding

The marking of the specified product contains letters and numbers that indicate the type of product, its dimensions, and the calculated permissible load:

1. The first designation for ribbed slabs is the presence of a special technological hole of a specific diameter. As a rule, 1,2,3 may appear at the beginning. Such designations indicate that holes of size 40, 70 and 100 cm are used. For multi-hollow products there is a similar marking, only these numbers indicate the hole sizes - 159, 140 and 127 mm.
2. As for the letter designation, it looks like this: PC - hollow core slabs with a round diameter; PB – deckless, hollow-core; PNO – lightweight product; NV, NVK, NVKU - products with a large number of voids; PG – ribbed slabs; PV and PF, PS – U-shaped products with ventilation holes; PR – general characteristics of ribbed products; P, PTVs – designation of continuous additional products.

In the case where there is a letter O in the center, this indicates that the floor slabs have a vault-like surface. The third symbol indicates the number of supports: T-3, K – 4 supports.

Main Dimensions

All slabs have standard sizes, according to this GOST:

• • product length in meters is 0.6; 0.75; 1.49; 2.99; 5.97; 11.96.
• • width – 0.4; 0.5; 1.5; 3.
• • height – 0.04; 0.14; 0.30; 0.45.

Requirements for panels in terms of manufacturing quality - they should not differ from the standard ones by more than:

• • ± 10 mm along the length of the panels;
• • ± 5mm in height;
• • ±3 mm in shelf thickness;
• • width ± 6 mm (up to 2.5 m) and ± 8 mm over 2.5 m.

Cracks larger than 0.1 mm are not allowed in the body of the slabs (except for shrinkage and other technological cracks). All other damage (sinks, cavities, sagging, etc.) and their tolerances are specified in GOST 13015-2012. They shall not exceed the conditions of this standard.

The reinforcement may protrude from the end of the product by no more than 10 mm, in which case it must be protected with varnish or cement mortar.

Kinds

Reinforced concrete covering slabs come in two types: solid and prefabricated. The second option is the most common, since they are produced in standard sizes in factories, and arrive at the construction site in finished form.

The panels can be either ribbed (U-shaped) or regular - standard, flat. Ribbed products are used more often, since their design makes the roof more durable and easier during finishing work.

For additional reliability, the coating slabs are reinforced with steel mesh, the depth of the reinforcing belt is at least 2 cm from the surface. They are manufactured with prestressed and non-stressed reinforcement.

A slab with a pre-stressed reinforcing belt has the following designation:

• • PG – does not have holes in the surface of the slab;
• • PV – there are holes in the body of the panel for air ducts and ventilation shafts;
• • PF – has openings for mounting skylights;
• • PS – equipped with holes for installing light-aeration lamps;
• • PL – openings have been prepared for the installation of an easily removable roof.

Products that use non-stressed reinforcement are divided into two types: flat (FP) and ribbed (PR). There are no openings in the body of these slabs.

How much are

As for the cost, it depends on what material was used to produce this product and what strength characteristics it has. Each manufacturer indicates its own price.

Table 1 - Cost of popular floor slabs

Today, floor slabs are actively used in the construction of multi-story structures. Thanks to such an extensive classification, it becomes possible to choose the most optimal option for a particular case. It is the correctly selected type and size of products that will allow you to get a durable structure that will serve you for a long time.