When building buildings from foam blocks, bricks,natural and artificial stone requires a redistribution of the load over the window and door openings. To do this, use the jumper concrete. Its carrying capacity is determined by the size and internal structure.
Jumper concrete increases the strength of the building,increases its service life, preventing the collapse of the entire structure and openings. According to the principle of production, these products can be attributed to two varieties, the first of which is monolithic and is manufactured at the construction site, while the second is an assembly, which is produced industrially.
The team concrete lintel may be squared,however, its width does not reach 25 cm, as for plate lintels, this parameter is more than 25 cm. Beam lintels are L-shaped and are intended to support the product of floor slabs. It is possible to distinguish facade products that protrude beyond the facade of the building and are used for openings, the width of the ledge of which starts from 25 centimeters.
Jumper concrete may have standarddimensions that comply with GOST 948-84. Thus, the limiting values in length can be equal to 10.3, but the maximum figure reaches 33.7 cm. As for the height, it can vary from 1.2 to 2.5 cm. The width varies from 1.4 to 2. , 9 cm
Door and window lintels are mounted onportland cement without fitting, this indicates that the product cannot be cut. If the opening is too thick, it can be covered with several elements.
Concrete lintels whose dimensions werementioned above, according to state standards should have resistance to the occurrence of cracks, characterized by rigidity and high strength. The frost resistance of concrete must comply with F-35 - F-200. The concrete component must be strong and comply with the mark M-200 or higher. Humidity of concrete should not exceed 13%. Products are refractory and reinforced during production. JB jumpers have a technological bias, which indicates that the lower plane is slightly smaller compared to the upper one. The deviation in width can be 8 millimeters or less. As for the deviation in length, it can not be more than 2 centimeters. The reinforced concrete bridges are seismic resistant and able to undergo a 7-point earthquake.
Jumper concrete, the price of which may varydepending on the manufacturer, as well as technological conditions, must have a quality certificate and certificate. When choosing products, the first thing you should pay attention to is the load that an element can withstand. It is necessary to take into account the brand of concrete. If we consider several manufacturers, then Uralstroymarket is ready to provide a bar lintel at a cost of 975 rubles per unit. At the same time, the size will be 20.7 x 1.2 x 2.2 cm. For an identical product, the “concrete goods kit” requests a price of 512 rubles, while RusGradStroy offers the same products for 813 rubles.
When buying products of the type described is importantpay attention to the label, which decodes the size and technical features of the jumper. Mark - these are 3 groups of letters and numbers, which are separated by a dash. The first group denotes the section number, followed by the type of lintel and length. The second group allows you to understand what the design load and what class of reinforcement was used in the manufacture. The third group specifies marking of loops, issues of bars of fittings and mortgages. The seismic resistance and the degree of density of the concrete used in production are mentioned here.
Non-carrying jumpers can be mounted manuallyhowever, only if the height of the window or door opening is no more than 2 meters. As for the bearing jumpers, their installation is carried out by a crane. For the convenience of such work, holes, the diameter of which is 3 cm, are made in advance in the product. They are sometimes replaced with mounting loops. Before laying, lintels are checked for damage.
The solution is designed to fill the resulting hollow spaces, forming seams.
Choosing jumpers, you need to pay attentiontheir quality characteristics, since each model is intended for specific purposes. That is why it is important to pay attention to the labeling, which can be deciphered by you on your own after reading the article. However, installation in many cases is not possible to carry out on their own, without attracting construction equipment, the rent for which will have to be paid.
