When building buildings from foam blocks, bricks,natural and artificial stone requires redistribution of load over the window and doorways. For this purpose, a concrete jumper is used. Its load-bearing capacity is determined by its size and internal structure.
Main features and varieties
Jumper concrete increases the strength of construction,increases the period of its operation, 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 a team that is manufactured industrially.
Prefabricated jumpers and their parameters
The precast bridge can be a bar,while its width does not reach 25 cm, as for the plate bridges, then the above parameter is more than 25 cm. The beam jumpers are L-shaped and intended to support the product of slabs. It is possible to distinguish and facade products that stand for the facade of construction and are used for openings, the width of the clay lining of which starts from 25 centimeters.
The concrete bridge can have standarddimensions that correspond to GOST 948-84. Thus, the limiting values for the length can be 10.3, but the maximum figure is 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 making a fit, this indicates that the product can not be cut. If the opening has excessively large thickness, then it can be covered with several elements.
Concrete bridges, the dimensions of which werementioned above, by state standards should be resistant to cracking, characterized by rigidity and high strength. Frost-resistance of concrete should correspond to F-35 - F-200. The concrete component must be strong and conform to the brand M-200 or higher. The moisture content of concrete should not exceed 13%. Products are fireproof and reinforced in production. The bridges have a technological bias, which indicates that the lower plane is slightly smaller than the upper plane. The width deviation may be 8 millimeters or less. As for the deviation along the length, it can not be more than 2 centimeters. The reinforced concrete straps are earthquake-proof and are capable of undergoing a 7-point earthquake.
The cost of reinforced concrete bridges
Jumper concrete, the price of which can varydepending on the manufacturer, as well as technological conditions, must have a quality certificate and a certificate. When choosing products, the first thing you should pay attention to is the load that the 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 jumper 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, "JBI kit" asks for a price of 512 rubles, while RusGradStroy offers the same products for 813 rubles.
When buying products of the type described, it is importantPay attention to the marking, which decodes the dimensions and technical characteristics of the jumper. Mark - this is 3 groups of letters and numbers, which are separated by a dash. The first group denotes the section number, followed by the type of jumper and length. The second group allows you to understand what the design load is and what type of reinforcement was used in the manufacture. The third group indicates the marking of loops, the release of bars and fittings. Here, seismic stability and the degree of density of concrete, which was used in production, are mentioned.
Do not carry jumpers can be mounted manually,but only if the height of the window or doorway is not more than 2 meters. As for the bearing bridges, their installation is carried out by a crane. For ease of carrying out such work in the product holes are made in advance, the diameter of which is 3 cm. They are sometimes replaced with mounting loops. Before making the masonry, jumpers are checked for damage.
The solution is designed to fill the hollow spaces obtained, forming seams.
When choosing jumpers, it is necessary to pay attention toon their qualitative characteristics, since each model is intended for certain purposes. That is why it's important to pay attention to the markings, the decoding of which can be done by you after reading the article. However, in many cases installation can not be carried out on their own, without using construction equipment, for which rent will have to be paid.