Lightweight monolithic overlapping of profiled sheet personal experience

Along with wooden beams and slabs reinforced concrete slabs, including private developers are popular and solid. These advantages include not only the solidity and durability inherent to the same plates, but also the ability to block the premises of any configuration. In this case the disadvantages are the large weight plates requiring power base and wall materials of increased strength, and the need for formwork assembly. Therefore, many samozastroyschiki, including craftsmen of our portal, choose a lightweight variety - monolithic slab of profiled sheet, which will be discussed in the material. Consider:

• What is Solid ceiling of the profiled sheet.
• Devices Technology of composite slabs.
• The experience of the participants on the portal device unsupported monolithic slabs of steel sheet.

Solid ceiling on the profile plate

Initially NIIZhB (Research Institute of Concrete and Reinforced Concrete) USSR State Committee developed a method casting monolithic concrete floors with steel profiled decking (SPN) for buildings and industrial facilities destination. The first recommendations on the design of monolithic concrete floors with SPN were developed in 1987 year, after almost two decades, appeared stations 0047-2005, in fact, a slightly updated version of the first option. However, those who want to understand the technology and make their own calculations, without the services of professionals, our old-timers are advised to first study the training manual originally from the Soviet Union.

Yury (Member FORUMHOUSE):

If you want to understand without extra costs, read the recommendations for the design of monolithic concrete floors with steel profiled decking NIIZhB, 1987

The technique consists in that the corrugated board is both permanent shuttering, reinforcement and outer plates, and a finishing layer.

When it comes to production areas, such outdoor decoration is more than enough. According to the developers stations, lightweight overlap on the profile compared with conventional monolithic slabs have a number of advantages:

• Reducing the amount of steel beams - 15%.
• Reducing labor costs - by 25-40%.
• Reducing weight plates - 30-50%.
• Increasing the stiffness of slabs (horizontal load).
• Simplify communications wiring - placement of roads in the corrugations.
• Lack of wooden formwork - increase speed.

The use of steel-reinforced concrete slabs in the construction of industrial and private buildings is permissible under the following basic conditions:

• slightly aggressive and non-aggressive exploitation of Freshwater;
• moisture conditions up to 75%;
• Room temperature not higher than + 30⁰S;
• Concrete used without potassium chloride and other chlorine-containing additives.

That is the main contraindication to this type of overlap is high humidity, because of what they usually used as inner lining and is not applied between the pedestal and the first floor or a basement and first floor.

al185 (moderators FORUMHOUSE):

Profiled in the basement rot, who are interested in dates, check search. On the protection of wheel arches rusting galvanized screws a couple of months.

To fill the plates allowed to use both heavy and lightweight concrete, but the class of compressive strength for heavy concrete fine aggregate - on the B15 (M200) for lightweight concrete with porous aggregates - from V12,5 (M150). Minimum concrete layer above the decking profile - 30 mm when the finishing screed is provided if no screed - 50 mm. The flooring is manufactured from profiled sheets bearing (H), the height of the corrugations 44 mm.

To apply the reinforcing cage rebars periodic profile, Class A-III, and wires class Bp. If you plan to overlap with the stairwells, the need to strengthen the reinforcing cage along the perimeter of the device and the formwork board. Steel beams of the power frame or rolling, or composite profiles.

slabs of composite devices Technology

In the initial embodiment proflist laid not only on a wall but also on a frame of steel beams (runs), which is the carrier. The number of beams and the parameters are calculated individually, based on the size of the overlapped and projected flight loads, average pitch of from 1.5 to 3 m, but in each sheet should account three support points - of the keeper and edges. Reinforcement monolayer - mesh, wire diameter of 3 mm, pitch of 200 × 200 mm, thickness of the protective layer over the grid at least 15 mm.

Trapezoidal sheet stacked across the long side of the span, broad corrugations down along the length of runs to overlap, at least one wave width of the butt. Between a fixed wavelength rivets or screws with a pitch not greater than 500 mm. To profile and runs to work as a single system, the flooring is attached rod anchors, which are welded to the beams. Next to the anchor load-bearing walls must pass through each wave, intermediate beams through one. In addition, fixed to the floor beams by screws or dowels.

However, the use of steel beams - not the most attractive option for samozastroyschikov, so many of craftsmen of our portal prefer alternative - unsupported monolithic overlap on the profile sheet.

The experience of the participants on the portal device unsupported monolithic slabs of steel sheet

Winder (Moderators FORUMHOUSE):

Overlapping of profiled sheet can be without I-beams or U-sections.

Instead of using the frame beam carrying a steel sheet with a wave height of 60 mm, 0.7 mm thick, and enhanced reinforcement - the bottom, top, and cross grid. In this case, the shaped sheet is a permanent shuttering, and loading takes basic reinforced reinforcing cage. The sheets are stacked and narrow down flexi hose as well as a method with beams, oriented transversely to the long wave side of the span. It turns out a kind of monolithic ribbed slab, only the ribs are formed not removable formwork and corrugations. In contrast, a composite plate with a support on a beam, this plate is not recommended to fill in lightweight concrete and strength class Compressive should be increased to V22,5 (M300).

Winder:

Load keeps it concrete or foam concrete, expanded clay lightweight concrete or do not have the necessary strength. Strengthening reinforcement in this case is useless.

When pouring necessarily vibrating thorough solution. If necessary, give the bottom struts, which is removed after concrete curing.

One of our craftsmen decided to use steel sheet not only as a formwork, but also as an additional power frame.

worodew (Moderators FORUMHOUSE):

I do monolithic overlap of N75 steel sheet, 0.7 mm thick. In order not to lose its bearing capacity, after pouring decided to include it in working with concrete. Made as follows: a puncher (6 mm drill) in each crest of punched holes through the meter and inserted therein segments wire 6 mm thick, 10 mm long, and put it instead Stars and tied valve, plus top grid. Even the hardness increased, comparing before and after mating fittings.

Spans of 3.6 and 2.0 m, in the wave armature 12 mm from the top - from the wire mesh 5 mm thick, with the cell 100 × 100 mm. Bottom wave scraps aerocrete closed and sealed slit assembly foam, enough for one cylinder 70 m². Flooring is based only on the exterior walls to the supporting wall in the middle. Slab poured concrete pump, the overlap thickness - 130 mm, area 76 m² took about 7 m³ solution (M300). A few hours later it was possible to cut the hills, guided by the rule, the next day moistened plate and polished.

floor heating system is usually mounted in the finishing plate, but if desired, can be combined Heated floor and ceiling of monolithic shaped sheet.

Toha71 (Moderators FORUMHOUSE):

Is it possible to mount the pipes directly into the TA pour plate? whether such overlapping presence in her pipes TP does not weaken? And if you can, as the thickness of the pipe to add a 20? I understand that the TP should be placed between the layers of reinforcement to the top layer of reinforcement in the concrete does not "sink" for its normal work? I would like to try once and pour concrete evenly, so there was only a finishing self-leveling floor and did not have to load the board further tie.

The process is viable, with the proviso increase slab thickness and having a certain experience.

Winder:

Add 20 mm, due to the fact that the plate is thicker, its strength will increase, which will compensate for the weakening of the pipes. Sami tube must be placed approximately at the center of the plate. In general, mortgage TA overlap makes sense only if you are sure that you can fill the plate is very flat, so you do not have to align the tie. If the tie still is, it is easier to place it in TA.

If the house is seasonal and heated in cold periodically, on the steel sheet will be formed condensate, as, indeed, and other surfaces. In this situation, help warming.

Winder:

The solution for such ceiling - polyethylene foam 5.10 mm thick with careful sizing joints between the ceiling and ceiling.

To help everyone who is going to fill a lightweight monolithic overlapping of profiled sheets without beam frame, Winder I posted a summary table. It is indispensable when there is no project and make professional calculations. Load capacity given overlaps of 550 kg / m².

Also craftsman shared overlapping schemes.

As for the economy, in terms of finance, this overlap will cost almost as much as the hollow-core slabs, and possibly a few more. Nevertheless, it is an adequate alternative pustotkam if there are problems with access of heavy equipment.

Unogroup (Moderators FORUMHOUSE):

I build on a site built up on all sides, back and calls in a mixer with difficulty, and with a tap of the platform, you can not dream. Compared with a cargo helicopter to deliver plates for the last 40 meters and put on a monolithic steel sheet overlap penny worth.

The advantages of the composite slab in front of the conventional monolithic already counted developers stations 0047-2005. A use of this technology in the source or unsupported embodiment or prefer other types of overlap, one chooses for themselves. But that the process is working, verified by many of our craftsmen.

To ensure the viability of such overlap, it suffices to study the corresponding thread in the forum. What are generally overlap - in the material their varieties. In the video - another type of overlap, precast-monolithic.

Discuss the article and read other materials devoted to country life you can on the websiteFORUMHOUSE.

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