Strengthening openings in the load-bearing walls of panel and brick houses with a structure of corners and channels is the main way to preserve strength characteristics. The metal structure takes on the load that was previously carried by the cut out part. Such work is necessarily carried out when dismantling part of a load-bearing wall, but in the case of non-load-bearing structures it is often also necessary.
Installation of metal structures is usually required in the following cases:
- When remodeling an apartment, for example, to create a single space for the kitchen and living room.
- Formation of reinforcement of doorways in walls during the redevelopment process.
- When creating niches for various purposes: for safes, cabinets, shelves.
- Cutting window openings.
Work in apartments and public buildings is carried out only if there is a project. It reflects all the nuances and carries out calculations of the metal structure for bending and strength. In private households, it is possible to use standard, time-tested solutions.
Reinforcement of openings is used when arranging niches, storage rooms, as well as openings in load-bearing walls and partitions made of reinforced concrete panels, monolithic reinforced concrete, and brick. This technology will be relevant when working with concrete foundations, partitions made of gas silicate brick, foam concrete, expanded clay concrete, plaster. Openings and openings in reinforced concrete floors are strengthened for restoration bearing capacity buildings. Strengthening is carried out using metal jumpers, steel frames, support frames, columns, crossbars, beams.
LLC Center for Diamond Technologies provides services for strengthening openings in Moscow and the Moscow region. Main principle Our work is about responsibility and professionalism. That's why we:
- Before starting work, unloading racks must be installed - they will take on part of the weight of the upper floor until the installation of the metal structure is completed;
- All material is subjected to anti-corrosion treatment;
- We use non-shrinking mixtures that gain a design compressive strength of 28 MPa after 24 hours;
- We use only non-impact diamond cutting methods to form openings, which does not lead to weakening of the structure outside the perimeter of the opening;
- We carry out all work in accordance with the recommendations of the Construction Quality Center.
- We do not carry out work on cutting openings without reinforcement, we do not carry out work in apartments without projects.
Strengthening openings does not tolerate and does not forgive an amateurish approach and skimping on the quality of materials. Trust your safety and the safety of your home only to certified organizations: require SRO approval, which gives the right to carry out work that affects safety capital buildings. Without complete set documents you will not be able to legitimize the redevelopment.
Strengthening a doorway in a wall is necessary in cases where the desired door block It has heavy weight and is highly durable. This applies most often entrance doors, from which not only reliability is required, but also high burglary resistance. And the last quality includes the strength of both the input module and the base.
Strengthening the doorway
Strengthening doorways with channel bars
This option is the most popular, as it is suitable for most brick and concrete load-bearing walls. It is known that the latter must under no circumstances be dismantled or their performance characteristics changed in any way. Modifications doorways They are precisely those who are subject to such restrictions.
Reinforcing the doorway with a channel
When dismantling part of the base, the channel structure compensates for the reduction in load-bearing load. This option solves several problems at once:
- maintains the load-bearing capacity of the floor;
- prevents wall collapse or cracking;
- increases the burglary resistance of the structure by increasing the strength of the base;
- allows you to install a door of the required design and type.
Such work is carried out by specialists, since hardening requires the use of special equipment, and prices depend on the volume of work and the nature of the brick or concrete wall coverings. Companies offering such services immediately prepare an estimate based on the parameters of the doorway.
Corners create a strong connection
Channel and corner reinforcement technology
In general, this is a U-shaped frame welded from channels. It is worth noting that this option is suitable for relatively narrow walls. If they are thick, which is not uncommon in old houses, the frame is constructed from corners and mounting plates, forming a counter-frame.
Additional carbon fiber reinforcement
The general scheme of work is as follows.
- The doorway is inspected and the required strength is calculated based on the degree of modification of the floors and the weight of the door block being installed.
- The opening is dismantled by chopping - with a hammer drill or grinder, or with a sharp saw. The first one is somewhat cheaper, and you can do the work yourself. Diamond cutting is performed with a special tool. This, firstly, guarantees the dismantling of material of any degree of strength and hardness, and secondly, it allows you to obtain smooth edges of the bases and do without brick laying, leveling and plastering.
- The channel structure is welded to size and transported to the consumer in finished form.
- The channel frame is secured with chemical anchors or steel pins, and fixed to the floor by welding to thick metal plates - support heels.
- The configuration of rolled metal is quite specific, so the frame is installed in the opening on cement mortar. Before this, notches are made on the surfaces to improve the adhesion of the brick and mortar.
- When anchoring, holes for fastening are pre-drilled, filled with polycement mortar and metal pins are secured. The frequency of fastenings is preliminarily calculated based on the weight of the door block.
- If the installation is carried out using chemical anchors, then drilled holes first place a capsule with special glue, and then the anchor bolt. The photo shows the installation of the channel frame.
Window openings are one of the most difficult components when finishing a facade with ceramic bricks. High loads often lead to collapses or the appearance of cracks, which not only spoil the exterior of the house, but can also lead to more serious consequences at any time. For this reason, the laying of brick lintels over windows, doors, arches, and portals should be carried out using reinforcement technology. Otherwise, it will be necessary to strengthen the openings of the building in use, and this operation is expensive and often leads to changes in the exterior of the building.
Strengthening openings with reinforcing mesh
Traditionally, reinforcing mesh made of high quality steel or composite materials. It fits into the seam of the masonry every 4-5 rows and allows you to redistribute the loads and make them more uniform. This significantly increases the load-bearing capacity. The meshes have a width from 250 to 600 mm, so they are most often used to strengthen rough masonry over window openings. In the case of cladding and ventilated facades, reinforcing rods, brackets and a clamp system are used.
Strengthening openings with reinforcing bars
Currently, there are many interesting products on the market that make the work of builders easier. This includes reinforcing rods, which are two parallel rows of steel wire securely connected to each other by zigzag jumpers. They are laid in the seam of the facing masonry; the width of the structure allows this to be done. A simpler version of the reinforcing rod consists of fasteners and a reinforcing rod. The design of the fastening element allows you to connect two reinforcement bars along their length and lay the bars at a certain width between them. Clamps can be attached to the rods, thanks to which reinforcement cage becomes voluminous. Different shapes clamps make it easier to work with all types of masonry. They can also be used to create brick arched lintels, but still the strength characteristics of such structures depend more on proper masonry.
Brackets for strengthening window openings
Ventilated facades made of ceramic bricks not uncommon today. To strengthen the window opening in this design, a system of brackets is used. They appear to be reliable and durable designs, capable of transferring the load from the facing layer to the load-bearing wall. It’s easy to select brackets with offset to the required distance, which will allow the use of insulation of a certain thickness.
The brackets are a shelf made of steel angle with support system. Clamps can be attached to the shelf to strengthen the first row of bricks above the window opening. You can use clamps for both vertical and horizontal masonry. Brackets are attached to load-bearing structure using a chemical anchor. This ensures high reliability of fastenings subjected to significant loads. The bracket system is used in low-rise construction.
One of the most effective ways restoring the load-bearing capacity of the wall after constructing an opening in it is reinforced with a corner. This profile has a number of advantages over the equally popular channel.
In particular, it is easier to install the corner flush with the wall. It fits more tightly to the wall, and it is easier to caulk the gaps between the corners and the wall with mortar to obtain a monolithic connection between the wall and the metal structure.
But channels are considered stronger than corners However, the choice of type of reinforcement is influenced not by established opinions, but by the decision of designers and engineers, depending on the required compensating load.
Reinforcing the opening with a corner photo:
So, Let's look at the main types of corner metal structures. Reinforcement of the opening with a corner can be carried out along the perimeter (contour) of the opening with a welded U-shaped frame, or only with a lintel. Typically, perimeter reinforcement is used for typical panel houses the authors of which are the State Unitary Enterprise MNIITEP, and reinforcement with the help of jumpers is sometimes carried out in brick houses.
When strengthening a doorway, the corners are fixed at its edges (overlapping or underface) and secured to the wall using anchors (angle reinforcement pins or chemical anchors). From the outside, the corners are connected by welding transverse plates (wedges) onto them. Then the gap between the corners is sealed with mortar. At the corners of the opening frame, small strapping corners can be additionally welded on top of the main corners.
To distribute the load on the floor slab, metal heels are welded under the frame supports from the corner.
When working with brick or wide concrete walls, as in the case of installing channels, reinforcing the opening with an angle can be carried out before cutting the opening. The corresponding grooves are made with a wall chaser, and corners are inserted into them, which will take on the load immediately after dismantling the section walls.
The corner for strengthening openings can be equal-shelf (equal height and width of the shelves) or unequal-shelf ( different heights and shelf width).
Standard openings with reinforcement according to standard projects of the State Unitary Enterprise MNIITEP in panel houses developed by this institute need to be strengthened only unequal angles with dimensions 100x63x8 mm. This condition complicates the work, because unequal-flanged corner metal products are much less in demand in construction, and accordingly, not so much of it is produced, and the required assortment is more difficult to purchase.
The cost of installing reinforcement depends on the type of reinforcement and material specifications. Exist standard solutions to strengthen a standard size opening in panel house. In most such cases, the openings are reinforced with a corner around the perimeter.
To calculate the cost of non-standard reinforcements or wide openings, we need to familiarize ourselves with the project, which you can send to email indicating the address of the property or WhatsApp 89257715642, 89261524271.
Cheap openings with reinforcement and fixing defects
If you don't have a project and you are going to make an opening without permission or you do not need documents from us, we can offer you to make an opening reinforced with a channel or corner for a standard solution.
Below is the cheapest cost of ready-made openings with reinforcement channel without documents from us.
An opening in a panel house with standard channel reinforcement, including metal and its delivery. The connection nodes have a corner and a strip. Anchors and plate (heels) for the channel.
| Concrete thickness walls |
Reinforcement material | Price in rubles |
| 14 cm | 16 channel, sheet 10, angle 75, fittings 12 | 28000 ! |
| 16 - 18 cm | 18-20 channel, sheet 10, angle 75, fittings 12 | 36000-38000 |
| 19 - 20 cm | 22 channel, sheet 10, angle 75, fittings 12 | 45000 |
| 21 - 22 cm | 24 channel, sheet 10, angle 75, fittings 12 | 52000 |
| 50 cm typical opening in two room apartment V block houses tower type house series I-209a | reinforcement with horizontal jumper 16 channel, 50-80 strip, M16 stud | 55000 |
Separate removal of the remaining construction waste:
4,000 rubles for removing garbage into a container (openings in the walls are 14-18 cm thick), if there is no container + 7,000 rubles for a container within the Moscow Ring Road. Completion time is one or two working days (depending on the thickness of the wall and breaks for noisy work). Metal to the size for reinforcement is prepared at the work site.
Strengthening openings in brick walls
DIFFERENT TYPES OF REINFORCEMENT FOR OPENINGS AND BEARING WALLS
Complete dismantling of the load-bearing wall followed by box
strengthening according to the project.
Preparing metal to strengthen openings on the first floor. Metal is always prepared to size on site.
Installation of combined reinforcement of load-bearing walls.
Ready combined reinforcement of the opening for top floor in a 2-room apartment after partial dismantling of the load-bearing walls and dismantling of the reinforced concrete lintel according to the MNIITEP project (type A).
Completed combined reinforcement of the opening on the top floor in a 2-room apartment after shortening the load-bearing walls and dismantling the reinforced concrete lintel according to the MNIITEP project (View B from the kitchen).
Complex reinforcement of wide openings after dismantling walls
27 channel on bolts according to the project.
Box reinforcement of openings with channels.
When expanding the opening to a wide size, the project provided for reinforcement with 20 channels under the ceiling with additional piping with 140 corners.
Before cutting a wide opening, the opening is first reinforced with a tie rod.
Finished opening reinforced with tie rods
according to the project.
Standard opening with double-row reinforcement with tie rod
according to the project.
Reinforcing the wide opening in load-bearing wall according to the instructions of the Moscow Housing Inspectorate
with partial sealing of the opening.
An opening with reinforcement for a niche and a doorway with reinforcement according to the project
in the carrier brick wall.
Complex reinforcement of an opening in a 20 cm wall according to the project
developer SU-155 (Mosaic).
Combining two apartments, complex combined reinforcement
opening according to the project.
The upper unit of the combined reinforcement of the opening.
The lower unit of the combined reinforcement of the opening.
Combined reinforcement of an opening from a channel and a corner in a monolithic wall.
Framing the opening with metal according to the project.
Strengthening a wide opening in a panel house on the top floor
according to the project.
Strengthening an opening from a 140 corner in a 24 cm monolithic wall
according to the project.
Combined opening reinforcement. Before cutting a wide opening, preliminary reinforcement is placed with a channel under the floor slab of the upper floor ( standard project MOSPROEKT).
The opening is ready, only after installation of the main reinforcement is the preliminary reinforcement dismantled.
Fixing the marriage. According to the project, strengthening the previously made opening and tying the column 125 with a corner.
Strengthening an opening in a brick wall and tying a column.
Extension monolithic ceiling with reinforcement from 27 channels
according to the project.
Partial dismantling ceilings and reinforcement installation,
24 channel is placed under the walls.
Finished opening with reinforcement in the ceiling according to the project.
And such projects for strengthening openings are not uncommon. The channel is welded to the reinforcement in the wall.
To open the reinforcement, you have to knock down the edges with a jackhammer.
Strengthening the opening in monolith 22 according to the project
Reinforcement of openings by welding of exposed reinforcement according to the project.
Reinforcing the wide opening in concrete wall according to the project.
Strengthening the opening, the project involves “recessing” the channel into the wall and tying it with studs.
ATTENTION! We do not have other sites, but on many Runet sites, the topics of which are: diamond cutting, redevelopment of apartments, strengthening of openings and walls, drilling holes- photographs of works made by the company Slom Service are posted, as well as information from the website website.
