Concrete cutting procedure
Concrete cutting angle grinder. Determination of the type of concrete. Choice of blade, type of cutting
When performing various construction work, it may be necessary to cut concrete. Since this material is very durable, this procedure has a number of nuances. In this article, we will take a closer look at how to cut concrete with an angle grinder..
Features and order of cutting on concrete
Before you can cut concrete, you need to determine the type of building material, especially if you are using an angle grinder with a disc. Therefore, first check the thickness of the surface to be treated. If the cutting depth is about 10 cm or more, then the diamond wheel on concrete is likely to stumble upon reinforcement, so you need to choose more durable cutting discs.
Also consider the following guidelines:
- Basalt and quartz quickly blunt the disc.
- The larger the filler fraction in the concrete slab, the slower the cutting will be..
- The smaller the hand cutting tool, the less power it will have..
- Use different concrete blades for fresh and hard material.
- Before starting work, it is necessary to make a test cut, no more than 1 cm deep.This is necessary in order to evaluate the operation of the equipment.
- When performing dry cuts, pull the blade out of the unit between cuts to cool it down faster..
- When using any equipment, be sure to wear a protective respirator mask, goggles and gloves.
- For perfectly straight, round holes in concrete, use special diamond core bits.
After preparing and checking the equipment, follow a few simple steps:
- Mark the line along which the cut will be made. To make your job easier, attach wooden blocks along the mowing line of the cut. Thanks to this, the blade or saw will not “carry” from side to side and you will not accidentally make an incision deeper than necessary..
- Turn on the equipment and make a test cut.
- Continue working by submerging the equipment to the desired depth (remove the blocks).
Choice
By itself, the procedure for cutting concrete is not difficult. The most important thing is to choose the right diamond blade and adhere to certain rules that are given above. In addition, safety precautions must be observed, as working with a power tool always requires special care..
From the video in this article, you can pick up some additional information on this topic..
Wall saw machines
The wall saw is another concrete cutting tool equipped with a diamond blade. The unit consists of a motor, a hydraulic pump station, guide rails (for vertical and horizontal fixation), a cutting disc (with a diameter of more than 25 cm) and a control panel.
Machines of this type provide better cut quality. In addition, the unit has the following advantages:
- The opening depth can be up to 7.5 cm.
- Suitable for large-scale works of increased complexity.
- With the help of the unit, cutting of reinforced concrete is carried out as quickly as possible.
- Low noise and vibration.
- Reliable fixation on the processed surface.
Of the minuses, it is worth highlighting:
- High Cost Concrete Cutting Machine.
- Training required to use the unit.
- Requires 380 W power supply.
How to cut concrete pavement slab with a grinder without proper tool for cutting.
In custody
If you plan to make repairs in an apartment or a country house on your own, it is better to give preference to hand tools and chainsaws. It makes sense to buy or rent more massive and expensive equipment for larger-scale works..
Seam cutters (seam cutters)
For cutting horizontal concrete slabs, creating expansion joints and openings, joint cutters are often used. The floor saw consists of a metal frame on wheels, an engine and a cutting wheel. This equipment is used to cut openings up to 2.7 cm deep..
- Stationary. Apparatuses of this type are used for thick layers of a monolith..
- Portable. Such units allow making cuts of different depths and configurations..
Among the advantages of this equipment is the ability to cut thick surfaces with minimal vibration. Of the minuses, it is worth highlighting the high cost and the ability to process exclusively horizontal surfaces..
Floor slab cutting
Guys! Has anyone cut floor slabs (there is a 58th I need to make 50) at home? Describe the process, how time-consuming? It is expensive and time-consuming to change.
Oh, I’ll gouge there a lot. You will get worn out. You gouge a large groove with a jackhammer, cut the fittings that come across with a turbine, then gouge further. And so it’s not bothering yet. And he got bogged down very quickly.
In general, what kind of stove? is it already mounted or not? In general, it is not worth cutting down reinforced concrete slabs. It is designed and arranged in a special way. It has support and support sections, where loads are distributed in a special way and there is a special reinforcement.
Having chopped down the stove, you will cut off these areas and then you will support it with whatever you have to do. In short, there is a very high probability that the slab will crack at least, or maybe just collapse. Should not be doing that.
I was told that it is possible to type an angle grinder Toko with a special circle or this does not happen?
Is it like at home? Have you got it chtoli? What is it based on in this case? Brand? Describe in more detail.
It happens. Concrete and small reinforcement are like a knife through butter. Dust is really super big. Only not one cutter for concrete, but in conjunction with a high-speed turbine.
I saw how the slab was drilled with perforators along the mowing line, and then beaten off. The biggest trouble was with the fittings. An angle grinder was cut off from above, it was impossible to crawl from below. I had to drag the gas cutter.
If the length is dreary, but the length is no problem. A good sledgehammer is needed anyway.
Go to the “Hammer”, there is any tool for rent, and there they can advise.
What kind of plates? Where will be used later?
Most floor slabs are pre-tensioned and cannot be.
Cut off, like two fingers on the asphalt: “angle grinder”, abrasive wheels to it, on which the mark is “stone” or “concrete”
40 rubles apiece, on a plate in a circle, or one with diamond dusting from 500 rubles, one is enough, cut 3-5 cm deep and with a sledgehammer, well, for fidelity, you can make holes through 7-10 cm with a puncher, half an hour on the plate.
angle grinder diamond detachable disc vacuum cleaner (so as not to be dusty). Normal disc from 1500 rubles.
Knock on Asya – I’ll tell you.
If a plate with prestressed reinforcement is absolutely not allowed to be cut! If usual, then it is undesirable but possible. But in practice, many cut and do not take a lot of steam. Then the load on the stove will be large??
if not mounted, then.
10 years ago, you raise the edge of the slab, at the cut-off point of the pipe by 1/2, punch holes in the voids with a crowbar, then use a sledgehammer to finish off the ribs. Cut off the remains of the frame with an angle grinder.
in one day, personally broke off 10 slabs, broke 2 sledgehammers, the crowbar did not break 🙂
Do not strike to break floor slabs – buy a new one.
although nothing is particularly clear from the post
I misunderstood the connection between the layout of the rooms and the floor slabs
wall thickness how much will be?
You are building voids with tension reinforcement for yourself, I would not dare to shorten them. Specialists will say unequivocally “no”. Look for someone you can exchange with, x. with him, even at a loss, otherwise live and think that he built a crypt for the family, a joke of humor, of course, it will not collapse at once, but imagine, erected walls, a roof and some kind of crack.
dumb. connected with the construction site, as I do ventilation / air conditioning at various facilities. a neighbor in the country bought an unfinished house, but also made some wisdom with slabs, and then it caved in. support columns were urgently erected.
and one lump somehow gave a lot of money, if only we walked through the air ducts through the supporting beams. responded, being afraid to fill up the house. This is how I remembered an example
live and fear that the ceiling will collapse. in my opinion it is better to pay taxes, but be calm.
we cut an angle grinder with a diamond disc almost diagonally of the slab, as it was necessary to make a complex ceiling. But the slab was short, about 2 meters and did not carry any load..
There is a cool way out: for little money compared to the cost of a new stove and possible defects, go to a normal construction institute and, after work, see with an assistant professor what you can cut and what you can’t. As a rule, such people along the way give so many practical advice that the whole event justifies itself.
It’s not that you can’t cut it – it’s elementary to cut: an angle grinder, a respirator, a segmented disk for dry cutting on reinforced concrete – if only there were no consequences.
In the crossbars, holes can also be made, but the procedure is the same: visit – inspection – miscalculation – drilling the hole with a diamond crown with cooling, but not chiselling, and a certain diameter and location in the crossbar.
True, the crossbar in my case was solid, although in the basement of a 12-storey building. In a low-rise building, this probably was not.
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Floor slab cutting
Is it possible to cut floor slabs?
Good day! Tell me, experts, is it possible to use hollow floor slabs cut by 0.6 m as floors on the 1st floor? The savings are good. Someone says it is possible, some – categorically not. thank.
Galina, hello. You are absolutely right. You can safely shorten the hollow core slab to the required length without losing its strength. The floor slab can withstand the design load from top to bottom, i.e. deflection, the main reinforcement in the slab is located in the lateral parts of the slab and in the lower parts of the lintels between the voids. You need to saw an angle grinder with a 230 mm concrete disc. Saw through the top and ends to full depth. If possible, it is advisable to make a cut from the bottom. The unnecessary fights back. The operation is not difficult at all. There shouldn’t be any difficulties. I’ve done this more than once. Good luck.
Categorically Yes you can!
and the slabs are not accidentally ventilated
You can use, if your room allows, if they are shortened, they do not lose their qualities in any way. Feel free to use in the construction of your home.
Of course it is possible and it is intended for this.
That is, I understood correctly that if the slabs are 6.0m, and I need 5.4m, then we can cut them off, and they do not lose their properties, they are reinforced, i.e. tense?
Galina, hello. You are absolutely right. You can safely shorten the hollow core slab to the required length without losing its strength. The floor slab can withstand the design load from top to bottom, i.e. deflection, the main reinforcement in the slab is located in the lateral parts of the slab and in the lower parts of the lintels between the voids. You need to saw an angle grinder with a 230 mm concrete disc. Saw through the top and ends to full depth. If possible, it is advisable to make a cut from the bottom. The unnecessary fights back. The operation is not difficult at all. There shouldn’t be any difficulties. I’ve done this more than once. Good luck.
Thank you very much to everyone, and especially to you, Sergey. You convinced us)
Tell me again! And for PKZh slabs (U-shaped) this applies?
PKZH slabs are not prestressed. Therefore, you can cut. Another thing is that, depending on the brand, they do not have a large bearing capacity. What brand do you have? There are PKZh from 1 to 5. 1 – maximum load 100 kg per m2. 5 – 500 kg per m2. Therefore, determine which slab you have and consult with an architect (designer) whether it is possible to use them.
In a U-shaped plate, the main load-bearing elements (reinforcement) are located in the lateral vertical parts. You can cut such a plate, while cutting is easier and more accurate. Only, it is imperative, before you start laying the walls of the upper floors on the slabs, it is necessary to lay voids (U-shaped) between the top of the wall on which the slab lies and the thin upper part of the slab. Hopefully explained clearly. PS. While writing (distracted) Vladislav P. wrote his commentary. I completely agree. Take advice.
Thank you for responding. We decided to take hollow-core slabs. Excellent forum!
hollow core slabs can be cut to the length you need
Galina, you can cut a hollow slab and it will not lose its strength.
These slabs are designed specifically for floors, even if they have been cut. The main thing is not to cut off with a sledgehammer, otherwise the cracks will go. And that sage sho said NO?
Cutting Concrete with a Circular Saw
Design features of PC floor slabs.
Floor slabs are made of heavy concrete with a thickness of 220 mm with longitudinal voids with a diameter of 159 mm. GOST9561 provides for the manufacture of several types of floor slabs. depending on how many sides they will rest on: two, three or along a contour. In slabs resting on two or three sides, the voids are parallel to the length of the slab. In slabs supported along the contour, parallel to the sides of the slab contour. The distance between the centers of the voids in the slabs – 185 mm.
Reinforcement is carried out using reinforcing cages made of hot-rolled and heat-hardened steel bar reinforcement of a periodic profile and high-strength steel wire.
For slabs with a thickness of 220 mm, in which the length does not exceed 4780 mm, and the voids have a diameter of 159 mm or 140 mm, the prestressing of the reinforcement is not necessary. The same applies to slabs 260 mm thick and up to 5680 mm long. Slabs with a void diameter of 127 mm can be produced with non-tensioning reinforcement, regardless of the length of the slab. All other slabs are recommended to be made with prestressed reinforcement..
Is it possible to cut the floor slab across?
Is it possible to cut floor slabs cutting floor slabs
Is it possible to cut floor slabs?
When building a house according to a project developed without taking into account SNiP and standard sizes of floor slabs, sometimes a situation arises when it is impossible to make an overlap exactly along the contour with the available slabs. In some places, the floor slabs go beyond the building contour, both in the longitudinal and in the cross section of the slab.
Naturally, the question arises – how to properly cut the slab and, in general, can this be done without prejudice to the load-bearing capacity of the floor? In order to answer this question, let’s take a closer look at the design features of hollow-core floor slabs PC.
What are prestressed reinforced concrete structures
Prestressed are the elements or products in which the initial tensile stresses are artificially created in part or in all of the working reinforcement beforehand, in the manufacturing process, and the subsequent compression of all or part of the concrete.
Compression of concrete in prestressed structures by a predetermined value is carried out by prestressed reinforcement, which tends to return to its original state after the tensioning devices are released. In this case, the slipping of reinforcement in concrete is excluded due to their natural adhesion, and in case of insufficient natural adhesion, anchoring of the ends of the reinforcement in concrete is used.
The initial prestress of the reinforcement after the tensioning devices are tempered is reduced to the calculated values due to the elastic compression of the concrete. Over time, the loss of prestressing of reinforcement increases due to shrinkage and creep of concrete and weakening of stress in reinforcement, its corrosion and many other factors..