Structural Strengthening necessary in the case when the load of the building began to exceed the maximum allowable, laid down in the project. This may be the result of work on the construction of additional floors, or errors in a dishonestly drawn up project, violation of operating rules, changes in the functionality of the building, corrosion processes.
But most often, strengthening the skeleton or parts of the structure becomes necessary due to its wear.

Structural Reinforcement Building

Strengthening the structure of the building involves carrying out work aimed at maintaining the ability of the building to endure heavy loads and increasing its rigidity. The procedures for strengthening the structure involve the use of various methods.

The main ones are the strengthening of the bearing capacity, the restoration of the building structure, its unloading, as well as the strengthening individual elements. Depending on the material, there are:

• gain metal structures,
• gain reinforced concrete structures,
• gain wooden structures etc.

Let's take a closer look at some of them.

Strengthening Reinforced Concrete Structures.

To strengthen reinforced concrete structures, work is carried out with the foundation, floor elements, crossbars, columns. As for trusses and beams, they are usually subject to replacement.

The strengthening procedures are preceded by the stage of preparatory work. Due to the creation of additional supporting conditions, the load of the bearing parts is distributed more evenly and transferred to new elements. It is important to understand that strengthening the structure of a building is associated with risk, since it is impossible to accurately assess the original data of old structures.

Reinforcing Metal Structures

To strengthen metal structures, either increase the cross-sectional area on which the load is applied, or increase its rigidity. Before starting all procedures, it is necessary to familiarize yourself with the project documentation and materials for the operation of the building. Further evaluation procedures and field studies are carried out.

The company "Metal structures MSK" has significant experience in strengthening metal and other types of building structures. We offer balanced solutions and use modern methods and materials that will allow your building to last for many years to come!

Order reinforcement of structures

"Metal structures MSK" will strengthen the structures different meanings. Reinforcing steel structures and various buildings begin in 24 hours after the signing of the contract. Always ready to go assembly team.

Payment

Production payment metal product produced in two ways:

• in cash;
• cashless transfer.

Cash you can pay the whole amount at once or divide it into 2 parts - prepayment and balances. Payment in cash occurs after the conclusion of the contract for the provision of services.

Bank transfer involves the transfer of funds. The transfer can be made from current account to account or from bank card on account. For customers, it is possible to transfer the amount with and without VAT.

The payment process must be discussed at the conclusion of the contract.

The team of masters of "Metal structures MSK" will do all the work on time and in the best possible way.

Publisher:"Budivelnik"

The year of publishing: 1978

Language: Russian

Pages: 112

Introduction

Chapter 1. Bent profiles - the new kind highly economical rolled metal for construction

The struggle to reduce the weight of metal structures, to increase their strength, reliability and durability led to the creation of a new type of rolled products - bent profiles. Curved profiles are different configuration corrugated sheets: z-shaped, trough-shaped, closed and other sections, details of practically unlimited length and constant thickness in all elements along the cross section.

There are several ways to get bent profiles, namely: stamping, bending on presses and broach. However, the use of these methods for manufacturing bent profiles does not make it possible to obtain profiles of great length, width and thickness. In addition, these methods are inefficient, lead to large losses of metal, the process of obtaining profiles with a complex cross-sectional configuration is very difficult. their area of ​​application.

It became possible to eliminate the listed shortcomings of bent profiles by manufacturing them according to a fundamentally new method and on constructively new equipment. Such equipment turned out to be special roll-forming units similar to rolling ones. Bent profiles obtained on these mills are called roll-formed profiles. From the point of view of manufacturing technologies, the fundamental difference between bent profiles and hot-rolled ones is their production from the original billet in the cold state and the invariance of the cross-sectional area during the molding process. Equipment for the production of roll-formed profiles is less complicated than rolling or extruding, its production is cheaper, and maintenance is easier and simpler. Capital investments and operating costs in organizing the production of roll-formed profiles are much less than in other types of metal forming, and the initial costs pay off in a short time.

Bent rolled profiles are produced by continuous profiling of sheets, strips and tapes on roll forming machines various types. The profiling process consists in successive changes in the truss of the cross section of the original workpiece (strip, flipper, tape) when it passes through a series of pairs of horizontal and vertical (idle) drive rolls (rollers) rotating towards each other.

Chapter 2

Particularly promising is the use in lightweight frames building buildings bent profiles

The main advantage of bent-welded closed profiles (GSP) in comparison with others is the following:

1) cost-effectiveness of characteristics in terms of weight, due to the favorable distribution of material over the sections of structural elements and a decrease in design coefficients as a result of a decrease in the volume of auxiliary and connecting parts;

2) the possibility of using a sheet of small thicknesses (2-3 mm compared to 5-6 mm in structures made of conventional profiles) due to increased corrosion resistance and local stability. The same abilities make it possible to effectively use steels of increased and high strength for HSP;

3) reduced vulnerability of structural elements from closed profiles during transportation and installation due to the absence of protruding edges;

4) improvement in performance due to increased corrosion resistance and reduced outer painted surface of structures, etc.

Feasibility studies show that SHGs are highly effective in rod systems and practically give the same mass indicators as pipes.

In the works of the UkrPSK Institute, it is proposed to create low-element farms in order to simplify the nodes and reduce the design coefficients.

In light, low-loaded structures, along with closed bent-welded profiles, it is advisable to use open bent profiles. So, in roof trusses with a span of 12-18 m under light roofs and in other lattice structures that perceive relatively small loads, the use of open bent profiles saves metal up to 20-30%. With an increase in spans, the efficiency of using open profiles decreases, and with spans of more than 24 m, significant metal savings cannot be achieved. In this case, savings are possible only when using closed bent-welded profiles.

As experience has shown, good decisions schemes, structures, assemblies, selected section shapes, welding technologies, etc. make it possible to create truly progressive building metal structures for medium and heavy loads, in many cases successfully competing with tubular ones, and sometimes even surpassing them.

However, for widespread implementation, it is necessary first of all to develop a single point of view regarding the entire problem. Unfortunately, not all organizations share the opinion that it is expedient to widely use roll-formed profiles. Much attention paid to pipes, distrust in the effectiveness of the use of bent profiles, in some cases the negative impact of tonnage planning and a one-sided approach to estimating the coefficient of specific labor intensity of prefabricated structures largely hinder the development of an important area of ​​metal building.

Chapter 3. Bent corrugated profiles in metal structures

In metal lightweight structures, various corrugated bent profiles are widely used as finished parts, which speed up installation, improve appearance, reduce construction time and reduce its cost. These profiles may have corrugations various shapes: semi-circular, rectilinear, trapezoidal, triangular with a blunt top, etc. A wide range of corrugated sheets used until recently was a consequence of the fact that consumers manufactured them for their own needs using existing equipment. In the absence of any unification for the production of profiles that differ in the shape of the corrugations, it was necessary a large number of shaped rolls or dies, the production of which took a lot of time and high-quality steel.

To reduce the number of profile sizes, reduce the cost of their development, speed up production and provide consumers, unification and standardization of corrugated profiles were carried out. Two standards have been developed for corrugated rolled profiles GOST 9234-73 and GOST 10551-75, which cover all profiles currently produced for various industries. In order to reduce the number of profiles made from galvanized blanks, unify their dimensions, a standard is being developed for galvanized corrugated steel sheet, which is used mainly in construction.

When developing standards, materials were used on the needs of the national economy in corrugated profiles, the assortment of profiles used in construction and industry, and the assortment of corrugated profiles mastered by metallurgical and machine-building plants. It should be noted that in last years not only the product range has significantly expanded, but also the need for corrugated bent profiles has grown.

Chapter 4

AT recent times in our country and abroad in various industries In industry and construction, bent perforated rolled profiles are becoming more widespread.

The use of such profiles in various sectors of the economy can reduce metal consumption by 18-20%, speed up the assembly and installation of structures, eliminate welding work during installation, and reduce labor intensity. installation work. The assembly of metal structures from perforated profiles is a modern and rational construction system.

Curved perforated profiles include profiles in which there are holes of various shapes and sizes, applied along the entire length with a certain pitch (module) of perforation.

Perforated profiles, depending on their application, should be divided into two large groups: profiles for collapsible structures and profiles for special purposes.

The first group includes perforated profiles of angular and channel section, the bolted connection of which in various combinations makes it possible to obtain lightweight metal structures. all kinds and appointments.

The most important advantages of perforated profiles of this group are their lightness, the possibility of quick installation without the use of welding, the repeated use of the same profiles in prefabricated structures for various purposes and others. These profiles, which are universal building material, are called profiles for quick assembly.

The second group includes profiles of a special shape, which are used only in certain structures. Perforated profiles are the basis of a complex system of structural elements for the manufacture of all kinds of metal structures in construction, warehouse, transport and production equipment.

Chapter 5

Construction is one of the main consumers of roll-formed profiles. The use of such profiles makes it possible to obtain the most advanced solutions for building elements, both in terms of architectural and aesthetic, and in terms of technical and economic indicators. Work is underway to further improve the designs of panel bindings for industrial and administrative buildings in order to facilitate the construction of bindings, increase labor productivity in their manufacture, improve working conditions indoors by increasing illumination, and improving the architecture of buildings. various configurations up to 2 mm thick: open, semi-closed, closed with elements of double thickness and a large number of bending points.

When developing a range of profiles for panel bindings, the technology for manufacturing them on existing roll-forming units was taken into account, as well as the technology for manufacturing bindings at metalwork factories to speed up the assembly of structures, reduce their cost and ensure a good appearance.

Compound open types bent profiles into closed profiles in the conditions of metalwork factories are most acceptable by electric arc welding. However, this welding method is inefficient.

Architectural and structural elements from profile lightweight rolled products are widely used in modern construction in the form of metal window and display cases, glass-metal doors, railings for stairs and balconies, door frames, guides for sliding doors and partitions.

The assortment includes profiles of open, semi-closed and closed cross-sectional shapes, as well as with elements of double thickness. Individual profiles are perforated.

Applications

Literature

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Metal structures are now very widespread. If previously they were used in construction only industrial enterprises, now these building construction took a strong position in the construction of new residential buildings and structures.

Today, the issue of lightening (reducing the mass) of metal structures is already acute. Moving in this direction, designers reduce the metal consumption of the building and “kill” two “hares” at once:

• the cost of the structure under construction is reduced;
• the mass of the building is reduced. This leads to a reduction in the volume of the foundation and, ultimately, again to saving the budget of the entire construction site.

Frame technology for the construction of buildings

Everywhere frames of buildings and structures being built according to frame technology, are made of cold-formed profiles (Σ-shaped or C-shaped) and (or) I-beams of variable and constant section welded to each other.

Fences are made of sheet (light) metal, which, to give it rigidity, is subjected to deformation:

• profiled sheet;
• profiled sheet with foil mineral wool insulation;
• sandwich panels, etc.

This is described in detail in the article "Design of metal structures" and on our website.

Thus, buildings and structures built using frame technology have a small mass. In addition, they have a number of undeniable advantages:

• it is possible (thanks to components at a specialized enterprise and the creation of a foundation at a construction site) to build them in a short time;
• they have a high maintainability. If any part or assembly is out of order, it is relatively easy to dismantle them (you do not need to disassemble the whole house - you just need to “unscrew” it, as in any mechanism). threaded connection replacement unit) and replace with exactly the same factory-made;
• for the construction of a building using this technology, a very modest budget is required, and more.

Today we’ll talk about other ways to stiffen sheet metal, which is used in the production of metal structures.

Ways to stiffen sheet metal

One of the new, but already popular, methods was the creation of lightweight metal structures. A new competitive technology in construction, which has this name, consists in the use of a wide variety of progressive spatial forms during metal deformation:

• volumetric faces;
• geometric figures:
  • rectangular recesses
  • rounded trays, etc.

This appearance is achieved by cold bending (cold deformation) of special blanks. So that metal elements have mechanical rigidity, and nodes - high strength, connect their vertices.

As a result of the connection, a binding is created that forms a system of rigid rods. It should be borne in mind that the more complex the shape, the higher the strength and bearing capacity of the prefabricated metal structures.

From metal products having such a design, you can assemble:

• frameless construction objects;
• basis for wall cladding, facades, etc.

There are several special design techniques aimed at increasing mechanical strength every single detail.

Ways to increase the mechanical strength of lightweight metal structures

There are several design and technological techniques (laid into the design of the part at the stage of its development) designed to increase the mechanical rigidity and strength of a lightweight metal structure:

• longitudinal profiling. It consists in creating horizontal sections of the surface in the direction of rolling the steel sheet;
• edge corrugation. Corrugations are created, the edges of which prevent the deformation of the part during operation;
• stamping. The stamping method creates a variety of volumetric convex (convex or recessed), cut stiffeners, etc.

Andfabrication and installation of metal structuresbuildings, hangars.

We are ready to discuss prices, your conditions and negotiate, in each case.
The cost of work is usually determined individually. Simply put, call - we will agree!

For more information, please contact below:

Address: Russian Federation, Moscow

Phones: +7 (495) 720-65-94

Our old prices

PRICES FOR INSTALLATION OF SANDWICH PANELS

ROOF SANDWICH PANELS

ROOF SANDWICH PANELS
MINERAL COTTON

Base prices in rubles for installation per 1 sq.m.

WALL SANDWICH PANELS
POLYSTYRENE AND POLYURETHANE FOAM

Base prices in rubles for installation per 1 sq.m.

WALL SANDWICH PANELS
MINERAL COTTON

Base prices in rubles for installation per 1 sq.m.

Installation of additional elements 75 rub. Prices are for installation without taking into account the architectural complexity and height of the building, as well as without the cost of installing scaffolding and renting lifting mechanisms

PRICES FOR DESIGN AND INSTALLATION OF STANDARD METAL STRUCTURES

DESIGN (WITHOUT APPROVAL)v

Prices are for design without taking into account the architectural complexity, the complexity of the engineering and theological conditions and the location of the construction site.

MANUFACTURING OF METAL STRUCTURES in Moscow

INSTALLATION OF METAL STRUCTURES

Light metal structures - Cost

Average prices and terms for 2008-2009:
Making the frame of the building 2700-3200r / m2
Construction of foundations 400-600r / m2
Full "zero cycle" 2800-3500 r / m2
"Warm building" 6 000 -8 000 r / m2
"Cold building" 5 000 - 6 000 rub / m2

Building Price Examples

(without "zero cycle") from our works for 2007.

The cost of installation of metal structures per ton may vary due to the complexity of the structures.
Prices and terms for projects may vary due to the complexity of the designs.