Monolithic reinforced concrete columns are essential element structures of any modern building. They are used in the construction of commercial, civil, industrial and administrative buildings. In some cases, these details are exclusively decorative element, for example, when designers use them to support balconies, loggias or open terraces. However, it is important that such supports, in addition to aesthetic appearance, also had high performance, because their main purpose is to ensure the strength of the entire structure. Therefore, you should purchase such items only from trusted manufacturers. The Parastek Beton company is an opportunity to purchase reinforced concrete columns at competitive prices in Moscow and be sure of impeccable quality. With twenty years of experience in the market for the production of reinforced concrete structures, we offer reliable, strong and durable products that have proven their effectiveness more than once. Thus, reinforced concrete products - columns are best solution during the construction of any buildings.
Varieties of reinforced concrete columns:
By section type:
Classification by type of manufacture:
The Parastek Beton company is an opportunity to purchase reinforced concrete columns at competitive prices in Moscow and be sure of impeccable quality. With twenty years of experience in the market for the production of reinforced concrete structures, we offer reliable, strong and durable products that have proven their effectiveness more than once. Thus, reinforced concrete products - columns are the best solution for the construction of any buildings.
Concrete concrete columns from Parastek Beton
Reinforced concrete is a strong composite material consisting of steel and concrete. Buying reinforced concrete columns means making a choice in favor of the durability of the building, because such elements have practically no expiration date. Parastack Concrete produces supports of any size with different sections, which are distinguished by the following features:
- can be used in buildings of any purpose;
- suitable for both single-storey and multi-storey structures;
- can be made with a rectangular or square section (at the same time, the minimum section size of a monolithic reinforced concrete column is 300 by 300 millimeters);
- possess high class fire resistance;
- can be produced up to 24 meters high, multi-tiered and solid, if necessary, the construction of several floors, or in the height of one floor;
- equipped with cantilever ledges for supporting ceilings, roof beams, etc. (if necessary);
- it is possible to create hidden cantilever ledges using the "BSF" system - a steel embedded part is hidden in a beam-rack connection. In this way, the cantilever protrusions are not visible and the beam can be supported. This system is suitable for columns with any section;
- between themselves, the elements are fastened with bolts or reinforcement, and fastening to the foundation is carried out using glasses, reinforcement outlets or anchor bolts.
Characteristics of rectangular columns
Favorable offer from Parastek Beton
The production of reinforced concrete columns by our company is carried out in accordance with current standards GOST. You can order all the necessary volume of products from us. At the same time, the elements can be manufactured both according to the drawings of the customer, and according to the drawings earned by our design bureau.
The price of reinforced concrete columns always remains affordable and may vary depending on the following characteristics:
- type of parts (presence or absence of consoles, section type, etc.);
- brand of concrete;
- fittings used;
In frames of one-story industrial buildings three types of steel columns are used: a section of constant height, a section of variable height - stepped and in the form of two racks, loosely connected to each other - separate.
In columns with a section of constant height, the load from overhead cranes is transferred to the column rod through the consoles on which the crane beams rest. The column bar can be of solid or through section. A great advantage of columns of constant cross section (especially solid ones) is their structural simplicity, which ensures low labor intensity of manufacture. These columns are used with a relatively small lifting capacity of cranes (Q up to 15-20 tons) and a low workshop height (H up to 8-10 m).
With heavy-duty cranes, it is more profitable to switch to stepped columns, which are the main type of columns for one-story industrial buildings. The crane beam in this case rests on the ledge of the lower section of the column and is located along the axis of the crane branch.
In buildings with cranes located in two tiers, columns can have three sections with different sections in height (two-stage columns), additional consoles, etc.
At taps special regime works either make an opening in the upper part of the column (with a width of at least 1 m), or arrange a passage between the crane and the inner edge of the upper part of the column.
The general dimensions of the columns are set during the layout of the transverse frame.
In separate columns, the crane stand and hipped branch are connected by vertically flexible horizontal strips. Due to this, the crane stand takes only the vertical force from the cranes, and the hipped stand works in the transverse frame system and takes all other loads, including the horizontal transverse force from the cranes.
Separate type columns are rational for low location of heavy-duty cranes and for the reconstruction of workshops (for example, when expanding).
a– constant cross section
b, c- variable section stepped (with one ledge)
G– stepped separate type
23. Types of sections of steel columns of one-story industrial buildings.
Types and sizes of sections of eccentrically compressed columns are predetermined. In columns of constant section, the section height h is taken approximately 1/15 l with a column height of 10-12 m; 1/18 l- at a height of 14-16 m and 1/20 l at a height of more than 20 m ( l- the distance from the top of the foundation to the lower support node of the roof truss). In columns of variable section, the height of the section h 2 of the crane part is taken within 1/8 - 1/12 of the height l (usually h 2 \u003d 500 mm and less often 750-1000 mm), and the height of the section h 1, the crane part - 1/10 - 1/20 l depending on the height l 1 and the type of section (solid or through). A solid section, according to the conditions of saving metal and the complexity of manufacturing, is prescribed at a section height h of up to 1 m, through - at h > 1.2 m. Some types of column cross sections are shown in Figure 7.2.
a - c, w- solid, g - h- through
In one-story industrial buildings, prefabricated reinforced concrete columns use solid rectangular sections (Fig. 53, a, b) and through two-branched (Fig. 53, c). In buildings equipped with overhead cranes, the columns have consoles for supporting crane beams on them, on which rails are laid to move the crane. Unified columns have a height that is a multiple of the module 600 mm. The design height of the column (H) is calculated from the level of the finished floor of the room, i.e. from the mark 0, 000 to the top of the column, excluding its lower end 900-1350 mm long, which is embedded in the foundation.
Rice. 53. Types of prefabricated reinforced concrete single-story columns industrial buildings: a - for craneless buildings; b-crane of rectangular section; c - crane two-branch for middle rows
The part of the column, located above the consoles, is called over-crane, below - under-crane. The overhead part of the column, which supports the elements of the coating, is called the overhead column. In two-branch columns, the over-column is made from one branch, as a result of which ledges are created to protect the crane beams. The upper end of the column has a steel embedded sheet with anchor bolts for fastening the load-bearing elements of the coating. Steel embedded parts are also provided in the places of installation of crane beams and ties and, in addition, in the side planes of the extreme columns (for fixing walls).
To align the position of the columns during their installation, risks are provided in the form of vertical grooves of a triangular profile. They are applied on the four faces of the columns (top and bottom), as well as on the side faces of the consoles of the columns.
The columns are made of concrete grades 200, 300 and 400, the working reinforcement is made of A-Sh class steel.
The half-timbered (auxiliary frame) columns arrange end half-timbered and half-timbered longitudinal walls of one-story industrial buildings with a length wall panels 6 and 12 m.
The columns rely on the load from the wind and the mass of the panel walls. install columns on independent foundations. The outer face of the columns is located in the plane inner surface walls.
The columns are made of concrete of grades 200-400, the working reinforcement is made of steel of class A-Sh.
26. Calculation and design of solid columns
The bending moments and transverse forces in the sections of the column are determined as in a cantilever beam loaded with an external load and reaction Re. Usually, 4 sections along the length of the column are calculated.
Sections of columns are calculated taking into account the influence of buckling (if λ> 34-12 * Mmin / Mmax, it is necessary to take into account the buckling) on the eccentricity value longitudinal force
ea - random eccentricity
ea-MAX ( 20 mm
ρmin=5Nsd/(fyd*b*h) As1= As2=(ά*fcd*bw*d)/fyd * (άm,1- άn*(1-άn/2))/(1-δ)
άm,1= M sd /(ά*f cd *b w *d 2) - relative moment δ=c/d
άn= N sd /(ά*f cd *b w *d) - relative value of the longitudinal force
I check the columns from the plane of the transverse frame for stability as compressed elements. Columns are checked for forces arising during transportation and installation.
Short column consoles rely on the action of the support pressure from the crane beams
V rd , ct =*b w *d<=V rd , ct , max =0,5*b w *d*f cd *ϒ
The sectional area of the longitudinal reinforcement of the console is determined by the bending moment at the edge of the column, increased by 25%.
A s 1 \u003d 1.25 * M / ((f yd * (d-c 2))
Column design:
Concrete not lower than C12/15, for heavily loaded-C20/25
To carry out the construction process of a private or multi-storey building, one cannot do without the use of reinforced concrete. What is reinforced concrete? Concrete is a building material that has a low strength index. This figure may vary depending on the method of concrete production, as well as the brand that was used for production. But, one way or another, it is still unsafe to use concrete due to the high level of fragility. That is why it is additionally reinforced. For this purpose, steel or another type of metal is most often used. It is desirable that it does not succumb to the formation of corrosion on the surface. On the basis of reinforced concrete, floor slabs can be made, as well as reinforced concrete columns, which are indispensable in private or multi-storey housing construction. Please note that you need to contact only professional manufacturing companies. Only in this case the construction will be safe. Consider the main features and advantages of using reinforced concrete columns, what technical characteristics they have.
The main advantages of using
The use of reinforced concrete is extensive due to the large number of positive aspects of operation. The main advantage is a high level of rigidity and resistance to various loads. Modern reinforced concrete columns are able to withstand the heavy weight of floor slabs. Also, the following factors can be attributed to the advantages of such columns:
- High level of rigidity and durability of application. Please note that such reinforced concrete columns can be used for more than 100 years. It should be noted that the level of strength does not decrease with the service life. That is why the building can be operated safely for a long time;
- Fire resistance. The two main building materials are concrete and steel. These materials are not subject to the combustion process, which also positively affects the operation of the house and the safety of living in it;
- Static and dynamic loads do not affect the use of reinforced concrete columns. Even a strong vibration of the earth will not contribute to the destruction or deformation of modern columns of this type.
But it is also worth noting some negative aspects of the application: the heavy weight of the columns (it is very difficult to transport them, install the columns as well), the thermal conductivity is quite high. But, as a rule, a high rate of columns does not greatly affect the living in the house.