Typical technological map for the installation of screeds from a semi-dry mortar. Technological map Typical technological map for the installation of cement-sand and polymer cement screeds

Floor screed technology developed on the cement device sand screed floors from a hard semi-dry mortar, with the addition of polypropylene synthetic fiber, (construction micro-reinforcing fiber - VSM) performed, designed to level the surfaces of the underlying floor element or to give the floor a given slope.

The level of the required thickness, the material, as well as the strength of the floor screed is approved by the project, taking into account what type of floor covering will be carried out, what design of the floors will be used, and on the purpose of the room itself. "Recommendations for the installation of floors", which contain the correct order of the procedures required for the manufacture, as well as the installation of cement-sand rather hard and semi-dry solutions (mixtures), while using a special synthetic origin fiber, which is a screed device and carries out quality control all carried out on this stage works.

When one or another is developed routing, then it is necessary to take into account the existing special requirements that relate to the quality level used in the workflow various tools and materials. There is a whole range of reference manuals that describe all these requirements and instructions.

A developed technique that allows the production and installation of a screed using a special polypropylene fiber of synthetic origin, the latest equipment, produced in Russia and Germany, is used in the most diverse fields of activity:

  • in the housing and civil complex;
  • in ordinary civil buildings;
  • in various production shops;
  • when the arrangement of storage facilities is carried out;
  • in auto repair shops;
  • in exhibition complexes;
  • in various multi-storey car parks;
  • in thunderstorm terminals, as well as in hangars intended for aircraft;
  • in basements and various office space.

2. The process of organizing construction work for floor screed


2.1 . The screed is a monolithic and prefabricated layer relatively quite durable material, which is found in multilayer structures of coatings, as well as floors of buildings.

It is intended to carry out the perception, distribution, as well as the transfer of existing loads, for example: (possible snow cover is taken into account on the roofs, and the presence of a different number of people, equipment and goods on the floors is taken into account), when performing proper leveling of the layer, which is located lower, or in order to give this cover layer necessary structures floors and roofs of a certain slope and during the implementation of flooring on them finish coatings, for convenient movement of people and equipment on its surface.

2.2. All work that is aimed at installing a screed using a special fiber (meaning VSM - building micro-reinforcing fiber) must be carried out in accordance with the approved requirements after construction and installation work is completed, during which damage to this screed is possible.

2.3 . It is permissible to carry out work on the device of the screed when the ambient temperature is at the level of the floors, as well as at the temperature of the lower layer is not less than 5 0C. The temperature must be maintained throughout the entire duration of these works, as well as until the strength level established by the screed reaches at least 50% of the design one.

2.4. The screed, which is carried out using a rigid and semi-dry mixture, while performed by a mechanized method, must be laid the first time at a given design height.

2.5. In order to prevent or prevent the transfer of the allowed deformations to the installed floor screed from the existing building structures near the walls, along the columns, as well as the foundations, special insulating joints are laid by laying insulating materials (this includes: damper tapes, which are made on the basis of foamed polyethylene, isocom, isolon) completely to the entire existing height of the installed screed just before the start of laying the mortar.

2.6. In order to prevent chaotic cracking of the installed screed at the stage of hardening, as well as gaining the necessary strength, it is necessary to cut shrinkage seams in the required amount, and as a result, this screed will crack in the indicated direction. It is necessary to cut shrinkage joints along the axes of the columns and they must be joined to the existing corners of the joints that run along the perimeter of the columns. The floor map, which is formed by shrinkage joints, should be cut into squares as far as possible. The length of the card cannot exceed the available width by more than one and a half times. The generally accepted rule is that smaller size card, the less likely it is that random cracking will occur.

2.7. When work is carried out aimed at installing a screed using a rigid and semi-dry mixture, taking into account their structural characteristics, it is necessary to perform the following at the facility:

Preparatory activities:

  • provide access roads for lightning transport to the work site;
  • determination of a place for installing special equipment, as well as for storing those used in the manufacture and supply of mortar building tools and other materials;
  • provide the necessary access points to power supply;
  • provide the required lighting of the place where these works are performed;
  • ensure the supply of technical water to the area where the equipment is installed.

Technological work:

  • clean the entire surface of the layer that lies lower;
  • make marks of a clean floor;
  • arrange insulating material to the full height of the installed screed along each perimeter of the walls, along the foundations, as well as columns;
  • prepare a cement-sand mortar;
  • apply the solution to the area where the installation is carried out;
  • arrange beacons;
  • lay cement-sand mortar;
  • grind the surface of this screed using trowels;
  • cut expansion joints.

3. The process of organization, as well as the technology for the implementation of work for the installation of floor screed

3.1. Cleaning the surface layer, which lies lower, must be dealt with before laying work begins cement-sand mixture. The surface of the base must be well inspected, then thoroughly cleaned of various accumulated debris, as well as possible extraneous layers, remove accumulated dust with a special industrial vacuum cleaner, check the horizontalness at the base and the compliance of the slopes with the specified parameters, remove existing grease stains if cracks are found in the base , it is necessary to widen these cracks and fill them with a specially prepared repair mortar and close up the gaps that are between the prefabricated slabs. The base must be thoroughly cleaned, it must be quite strong and not have any delaminations.

3.2 . Take out marks. The level of the finished floor should be carried out by surveyors using a special laser level. However, it must be borne in mind that the clean floor must necessarily have the same level in all rooms of the apartment or house, or in the part of the floor that is located between adjacent landings.

3.3 .Seams are insulating. In order to prevent the possible transfer of deformations to the installed floor screed from the corresponding structures of the building near the walls, along the columns, as well as the foundations, it is necessary to arrange special insulating joints, by laying the existing insulating raw materials (this includes damper tapes made on the basis of foamed polyethylene, isokom, isolon), the thickness of which is 4-8 mm to the full height of the installed screed just before the start of laying the mortar.

3.4. Screed making. It is necessary to indicate in the work execution project or agree with the customer on the place where the compressor will be installed, pneumatic transport specialized equipment, intended for the manufacture and supply of the solution, the place where the building material used in the process of work will be stored. The required area for the placement of materials, as well as equipment, is about 30-50 m2. A semi-dry screed must be prepared directly on construction site or at the work site.

When a screed is made by mechanized method, using a special synthetic fiber, it is necessary to comply with certain requirements: the volume of sand used must correspond to the volume of cement also needed, which must have a ratio of 3: 1, taking into account the strict condition of equality of the washed seeded sand with a fraction modulus of 2-3 mm. The volume of the special mixing hopper of the universal pneumatic conveying equipment is 250 liters, according to the actual volume of the finished solution, 200 liters. The smallest amount of cement used for a single hopper load cannot be less than 50 kg (this will be one standard package). The ratio of water and cement is in the range of 0.34-0.45, which is equal to 17-24 liters of water for a single bunker load.

The loading of water, sand and cement is carried out in two stages. In the first step, you must first load ½ of the volume of sand, which is approximately 75 kg, as well as 50 kg of a bag of cement. Then you need to add polypropylene fiber and about 10-12 liters of water. At the second stage, it is necessary to make the final loading of the working hopper with approximately 100 kg of sand, as well as the required volume of water of approximately 7-12 liters, and synthetic fiber. The consumption of polypropylene fiber, which is used in this solution, is approximately 120-150 grams per whole hopper load, thus, for a one-time batch, based on 700-900 grams per cubic meter prepared solution. And fibrin must be added with each subsequent proportion of water. It is recommended to mix the fully loaded mass for at least a couple of minutes. The total running time of the bunker, taking into account the loading time, will be about 4-7 minutes.

3.5. The implementation of the supply of the solution to the laying site. The prepared cement-sand mixture under pressure must be delivered in portions through a special rubber hose directly to the laying site, and also laid on the base using a solvent quencher. On the vast areas floor screed must be done with cards. The size of the map can be determined based on the productivity of the working link, i.e., the floor area that was laid during one work shift. The time allotted for the supply of the prepared solution cannot exceed five minutes. Depending on which type of equipment is used, feeding can be carried out up to 160 m horizontally, as well as 100 m vertically. If it becomes necessary to deliver the mixture to a distance exceeding 100 meters, then the time for supply may take up to 7-15 m. , which is called "greenhouse", in the area where the compressor is installed, specialized pneumatic transport equipment.

3.6. Establishment of lighthouses, as well as laying a cement-sand mixture. The device of beacons is carried out using a freshly prepared mixture, pre-trimming with a level, without installing guides. After the semi-dry cement-sand mortar is supplied to the work site, the full volume of the map that has been prepared is filled with the solution. The mixture must be pulled out using a screed rule, which moves with two-sided support on these beacons until it is purchased. smooth surface. During operation, it is necessary to monitor the status of the exposed beacons. Trimming the surface, as well as the installation of beacons, is carried out at the same time, due to which it is possible to achieve uniform laying, and in the future, the complete absence of cracks.

3.7. Grinding the surface of the screed. The work associated with grinding the surface must be carried out immediately after the mortar is trimmed, and it must be completed before the mixture begins to set for 1.5-2 hours from the time of filing. Grinding the surface should be done with a trowel equipped with a special trimming disc, as well as in suitable shoes called concrete shoes.

3.8 . Cutting a deformation seam. In order to prevent chaotic cracking of the screed at the hardening stage, as well as to acquire the necessary strength, it is necessary to cut all expansion joints, after which this screed will crack in the right direction. Expansion joints can be divided into three main types:

  • structural seams;
  • insulating seams;
  • shrink seams.

It is recommended to cut shrinkage joints in a freshly laid mixture using a special cutter after the surface of the mixture has been processed with a trowel. The seams must be cut along the axes of the columns, and also joined together with the corners of the seams that run along the perimeter of these columns. The floor map, which is formed using shrink joints, should be cut into squares as far as possible. And the length of the card cannot exceed the existing width by more than one and a half times. The seam should have a depth of 1/3 of the thickness of such a screed. If the card size is small, then chaotic cracking is also unlikely.

4. Requirements for the level of quality, as well as acceptance of work.


4.1. Acceptance of work aimed at installing a screed must be carried out based on the requirements of SNiP III-B. 14-72 “Floors. Rules for the production and acceptance of work.

4.2. Open seams, cracks and gouges are not allowed in screeds. The deviation of the screed thickness level from the specified one is permissible only in some places, and cannot exceed 10% of the design thickness.

4.3 . The surface of the screed must be at a given level.

4.4. The surface of the screeds must be horizontal or have a specified slope.

4.5 . Using a two-meter rail, you can check how even the surface of the screed is.

4.6. Moisture level of screeds during installation of linoleum floors, parquet boards, textile coverings, pvc tiles, block parquet, as well as shields, must be no more than 5%.

5. Occupational health and safety.

5.1 . Before work begins on the installation of screeds, the person responsible for their implementation must conduct the necessary briefing of workers, as well as issue overalls and protective equipment. When carrying out work, you must follow the safety regulations.

5.2 . Particular attention is paid to the following points:

  • maintenance of mechanisms and installations can only be allowed if the employee is at least 18 years old, has passed a medical examination, has a specific qualification, is familiar with the device, as well as with design features equipment, has a certificate giving the right to their maintenance;
  • installations must have a personal grounding center.

5.3. Before starting work, the operator must:

  • conduct an external inspection of the installation;
  • check the condition of grounding and wiring;
  • check the alarm system.

5.4. During operation, the driver must:

  • apply the solution only in accordance with the signal supplied from the working area;
  • apply only thoroughly mixed solution.

5.5. The equipment may only be operated and maintained by persons with necessary training and the right to operate.

Example An example of a flow chart for a floor screed device with noise insulation.

TECHNOLOGICAL CARD FOR FLOOR SCREED DEVICE

In the residential complex "12 Kvartall", Khimki

The terms of reference provide for the installation in the apartments of a floating cement-sand floor screed with impact sound insulation.

We suggest using sheet metal as impact sound insulation. soundproofing material"PENOLON" 8 mm thick. In combination with a floating cement-sand screed 60-70 mm thick, as well as when using a damper tape made of foamed polyethylene 5 mm thick, the screed design provides an index for improving shock and acoustic insulation within the normative SNiP 23-03-2003 "Protection against noise » in residential and public buildings.

Before installing the floor screed, the following work must be done:

a) Wiring on the floor of electric and internet cables. It is advisable to lay in a corrugated pipe.

b) Waterproofing of toilets and bathrooms (it is allowed to perform coating waterproofing 2 weeks after screed on the surface of the screed).

c) Piping in bathrooms (washbasins, washing machines, shower cabins).

Stages of work on the installation of floor screed in the apartment:

1. From the surface concrete base garbage is removed, large outgrowths of concrete are cut down.

2. On the surface of the floor slab, rolled insulation "PENOLON" with a thickness of 8 mm is spread. The joint of the soundproofing sheets is glued with adhesive tape.

3. A damper tape is installed along the perimeter of the premises to the depth of the screed - polyethylene foam, 5 mm thick.

4. On the street at the entrance, equipment for the preparation and supply of the solution (pneumatic blower), a water tank of 200 liters is installed. Cement and sand are temporarily stored in the required volume.

5. A rubber sleeve is pulled into the apartment from the street from the pneumatic blower along the evacuation stairs between the railings ( d 65mm) through which the cement-sand mixture for floor screed will flow.

6. Production of screed from cement-sand mortar:

· The preparation of the solution for the screed device is carried out directly at the entrance. The mixture is prepared according to the following algorithm: washed quarry or river sand(size modulus = 2.2-3 mm.) is poured into the mixing tank of the pneumatic blower. 1 bag of cement (50 kg), water and fiberglass are also poured there. There is mixing. When the tank is properly loaded, the mixing process ends with the addition of the last components, the mixture becomes homogeneous. The tank is filled as follows: 1) Sand 50 liters; 2) Cement grade CEM II - 32.5 D20 - 50 kg; 3) water 10 liters (with natural humidity sand); 4).; 5) sand 64 liters. 6) water 8-12 liters. The volume of the tank allows you to prepare 200 liters of cement-sand mixture of optimal quality and proportions for one full load.

· Transportation of the finished mixture of cement-sand mortar is carried out compressed air through flexible hoses. The prepared solution with a volume of 0.2 m³ is automatically divided into small portions and under pressure through hoses goes directly to the place of work (in the apartment) to the extinguisher. In the extinguisher, the working pressure is discharged, after which the solution is poured onto the surface concrete floor for styling.

· The solution coming from the quencher is manually distributed evenly throughout the room. A mixture of semi-dry cement-sand mortar is laid, compacted and leveled hand tool(rule). The level is controlled by a laser level. Reducing the volume of the mortar mixture due to compaction from 15 to 30 percent, depending on the size and voidness of the sand.

· After laying and leveling the mixture of cement-sand mortar, the surface of the screed is polished with a disk trowel.

· At the end of grinding with a trowel or spatula, expansion joints are cut with a depth of 1.5-2 cm (linear expansion), a width of 2-4 mm. The seams are cut according to the terms of reference, in its absence according to SNiP.

7. The remains of the cement-sand mixture, trimming of the damper tape and foam are removed. elevator hall, hallway front door is swept.

8. The Certificate of Completion is signed.

Walking on the screed is possible after 12 hours, at an air temperature of +20 ° C

Further production finishing works possible in 48 hours

2 days after the installation of the screed, it is recommended to slightly moisten the surface of the screed with water by spraying (0.2-0.3 l per 1 m2). If the screed is covered with PET film or other covering material in the next 2-3 days by the Customer (recommended for subsequent finishing work), moisturizing is not required.

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Call us at 8-800-333-16-58 or write an e-mail [email protected] to clarify the cost and terms of work. Restoring a domain and a website is not cheap, but the company’s reputational losses and the cost of creating a new website are much higher than the cost restoration work. The basic term for re-registration of a domain is 3 business days, site restoration - 5 business days.

Fill out a form for a domain for an individual (download the form) or send us the details of your legal entity. For works, the cost of which is from 7000 rubles. it is possible to conclude an agreement (download the agreement). You pay for work.

What is a domain:

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To whom the domain is registered:

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Technological map of the semi-dry DSP floor screed device
Technological map developed for the device cement screed from a semi-dry solution performed mechanized way using equipment for the preparation and supply of the solution.
This technological map is compiled on the basis of the requirements of SNiP 3.04.01-87 "Insulating and finishing coatings", SNiP 2.03.13-88 "Floors", MDS 31-6.2000 "Recommendations for the installation of floors" and regulates the sequence of operations for the preparation of cement-sand semi-dry mixtures (solutions) with reinforcing polypropylene fiber, screed devices and quality control of the work performed. This technological map takes into account the requirements for the quality of the materials used, namely: GOST 8736-93. " specifications»; GOST 25328-82. ". Specifications"; GOST 7473-94. “Concrete mixes. Specifications"; GOST 28013-89. "Construction mortars General specifications"; GOST 26633-91.

Technological map for the installation of a semi-dry floor screed.

1. Instructions for the preparation of semi-dry cement-sand mixtures with fiber reinforcement polypropylene using equipment for kneading and pneumatic supply through the sleeves.
2. Technical requirements. Device technology.
3. Positions of the device, technical control, acceptance.

1. Instructions for the preparation of cement-sand semi-dry mixtures with reinforcing polypropylene fiber using equipment for mixing and pneumatic supply through the sleeves.

When performing cement-sand underlying layers () using the semi-dry screed method, the following requirements for the preparation of mortars must be observed:
The ratio of the volume of sand to the volume of cement is 3: 1; Equipment "Turbosol M-250" has a volume of the mixing hopper according to the actual volume of the mixture of 250 liters. The minimum amount of cement per hopper load should not be less than 50 kg (1 standard bag).
The water-cement ratio is in the range of 0.35-0.50, which corresponds to 17-24 liters of water per hopper load. Data for natural humidity.

The loading of sand, cement and water is carried out in a working mixing hopper in two stages, namely:
First, the volume of sand (about 75 kg) and the entire bag of cement (50 kg) are loaded. Next, a bucket of water is added (10-12 liters);
Next, the final loading of the operating bunker with sand (about 100 kg) is carried out and necessary quantity water (7-12 liters). The fully loaded mass is mixed for at least 2 minutes. Total time operation of the mixing hopper, taking into account the loading time from 4 to 7 minutes.
The consumption of polypropylene fiber used for bulk reinforcement is about 120-150 grams per full hopper load or per one mix of mortar. Based on 1 m3 of the prepared solution, the consumption of polypropylene fiber is 700 grams. Polypropylene fiber is added with each portion of water, i.e. for 1 bucket of water about 60 - 70 grams.

2. Technical requirements. Device technology, brief instructions.

The supply of the prepared cement-sand semi-dry mixture (mortar) to the screed installation site is carried out by the pneumatic transport unit of the Turbosol M-250 equipment should not exceed 3-5 minutes. In particular difficult conditions delivery, for example: hose length over 150m and delivery height over 80m, the delivery time can reach 7-10 minutes. negative temperature outdoor air down to minus 10 °С preparation and supply of a semi-dry cement-sand mixture (mortar) is allowed with the obligatory installation of a “green house” above the installation site of the Turbosol M-250 equipment. With more low temperatures preparation and supply of cement-sand semi-dry mixture (mortar) is not recommended.

It is allowed at a temperature of the laid materials not lower than 5 0С and a positive air temperature in the room, measured in the cold season near the door and window openings at a height of 0.5 m from the floor level.
Cement-sand screed from semi-dry mixtures should not have direct contact with the enclosing structures of the premises. To do this, it is necessary to lay soundproof (damper) tapes made of polyethylene foam 4-8 mm thick over the entire height of the screed along the entire perimeter of the junction with walls, partitions, and other structures.
The screed device with a semi-dry mixture should be carried out immediately to the estimated thickness, because it is the basis for the finishing flooring.
Minimum overall thickness cement-sand screed is at least 40 mm.
The local minimum possible thickness of the cement-sand screed is 30 mm.
After the semi-dry cement-sand mixture (mortar) is supplied to the place of work, the mixture is evenly distributed by areas limited by compacted mortar beacons installed along the level. The semi-dry cement-sand mixture (mortar) is leveled with a tool called a “rule”, moved with two-sided support on these beacons.

Grinding the surface of the underlying layers (screeds) should be done with a machine equipped with a leveling disc. Grinding of the surface should begin immediately after leveling the mortar at a given level and finish before the mortar starts to set (about 1 hour from the moment of filing).
In rooms with an area of ​​​​more than 45 sq.m. it is recommended during the production process to draw up a map of the sequence of pouring areas with a division into areas up to 10 - 15 sq.m. Start grouting the already finished section of the room at the same time as leveling next section. In this case, the processing of the end surfaces of individual sections of the room is not carried out, and their junctions with a 2-3 mm gap form the required expansion joint.

Execution expansion joints slabs (screeds) required for rooms with a size in one dimension of more than 6 m are recommended in two ways, namely:
Expansion joints 5-7 mm wide, performed directly in the process of grinding the screed, are technologically manufactured by the method mechanical cleaning trowel of the area of ​​​​adjacency of the sections to the entire depth of the screed from crumbling residues of the mixture. Further, in the process of smoothing down the adjacent section, a small amount of semi-dry mixture is poured over the seam from above and the seam and zones of the adjacent sections are smoothed out. This achieves the result of a visually uniform surface with an organized expansion joint within the entire thickness of the screed.

3. Positions of the device, technical control, acceptance.

Technological operations of work production and requirements for them Control (method, scope, type of registration)
Preparation of cement-sand semi-dry mixtures (mortars) with reinforcing polypropylene fiber Acceptance of floors, the elements of which are made of materials that harden after laying, is allowed not earlier than they reach the design strength, the strength of these materials must be determined by testing control samples in the amount of at least three for every 500 m 2 of the floor layer. In the absence of control samples, a compression test of at least three cubes with an intact structure and a rib size of at least 25 mm, taken from the floor layer, should be carried out.
Laying insulating (damper) tapes made of foamed polyethylene with a width of 8 to 15 mm for the entire thickness of the screed along the entire perimeter of the junction with walls, partitions, other structures, as well as in doorways. Visual, all junctions, work log.
The nominal thickness of the cement-sand coating over the heat pipe is 30 mm. In cases where the installation field is arranged under the conditions of the maximum permissible curvature of the base, the thickness of the cement-sand coating over the heat pipe is not allowed to be less than 15 mm in separate places thermal plate Measuring, at least three measurements for every 50-70 m 2 of the screed surface or in one room of a smaller area.
Deviations of the plane of the element from the horizontal or a given slope - 0.2 of the corresponding size of the room, no more than 50 mm The horizontalness of the surface of each floor element is checked in all directions of the levels and with a control rail 2 m long, and in the presence of a slope - with a control rail-template with a level
Grinding the surface of the screeds should be done with a machine equipped with a leveling disc. Grinding of the surface should begin immediately after leveling the mortar at a given level and finish before the mortar starts to set (about 3 hours from the moment of filing). Measuring, at least five measurements evenly for every 50-70 m 2 of the screed surface or in one room of a smaller area.
Execution expansion joints thermal plates (screeds) required for rooms with a size in one dimension of more than 6 m. Technical, all seams.

TYPICAL TECHNOLOGICAL CARD

The device of a cement-sand floor screed with fiber reinforcement in a mechanized way

1 AREA OF USE

1 AREA OF USE

1.1. The technological map was developed for the installation of cement-sand screeds from a hard semi-dry mortar, with the addition of polypropylene synthetic fiber (construction micro-reinforcing fiber - BCM), performed by a mechanized method, designed to level the surfaces of the underlying floor element or to give the floor a given slope.

The thickness, strength of the screed and the material are assigned by the project depending on the type of floor covering, the design of the ceilings and the purpose of the premises based on the requirements:

SP 29.13330.2011 Floors. Updated edition of SNiP 2.03.13-88;

Floors. Code of Rules (in development of SNiP 2.03.13-88 "Floors" and SNiP 3.04.01-87 "Insulating and finishing coatings");

MDS 31-6.2000 "Recommendations for the installation of floors", regulating the sequence of operations for the preparation and installation of cement-sand hard semi-dry mixtures (solutions) using polypropylene synthetic fiber, - a device for screeding and quality control of work performed (Fig. 1).

Fig.1. Fiber tie device

When developing this technological map, the requirements for the quality of the materials used were also taken into account:

- GOST 8736-93 Sand for construction work. Specifications (with changes) ;

- GOST 25328-82 Cement for mortars. Specifications ;

- GOST 7473-2010 Concrete mixtures. Specifications ;

- Amendment N 1 GOST 28013-98 Building mortars. General specifications .

The developed technology for the manufacture and installation of a screed using fiberglass, modern Russian and German equipment is used in a wide variety of industries:

- Housing and civil complexes;

- In industrial, civil and public buildings (Fig. 2);

Fig.2. Floor screed in industrial, civil and public buildings

In production and industrial workshops;

- When arranging storage facilities;

- In garages and car repair shops;

- In trading floors and exhibition complexes;

- In multi-storey car parks;

- In aircraft hangars and cargo terminals;

- In offices, basements and roofs.

Technological stages mechanical floor screeding devices with fiber reinforcement(fig.3)

The necessary measurements are carried out, a topographic map of the premises is compiled. The goal is to measure the area and thickness of the layer. From a given reference point (options are possible), deviations from the horizon line to the existing coverage are recorded using a laser level. Based on the fixation of deviations and their further calculation in a variety of points, the future thickness of the screed is determined;

- the base is being prepared - the surface is freed from foreign objects, debris;

- in the immediate vicinity of the object of work (on the street) equipment is located - a pneumatic blower. This is a self-contained device with a diesel engine in the form of a semi-trailer;

- mortar hoses, through which the mixture prepared in the pneumatic blower is subsequently transmitted to the place of work, are mounted from the equipment to the premises;

- in the immediate vicinity of the equipment, the necessary materials are placed - sand, cement, fiber, plasticizer, water (constantly replenished capacity);

- the surface in the room is covered technical film, a damper tape is mounted around the perimeter of the room and at the junction with vertical surfaces;

- in certain proportions, the material is fed into the mixing chamber of the pneumatic blower, mixed and fed in portions to the place of work (the possibility of supplying the finished solution to a height of up to the 30th floor);

- the mixture is received by means of a special absorber connected to the sleeves high pressure, pre-planned, rammed;

- from a given horizon line along special technology beacons are formed from the finished solution for laying in the future a ready-made hard (semi-dry) solution at an equivalent distance from a given horizon line;

- with the help of special smoothing rails (rules), a surface is formed according to previously made beacons;

- the surface is rubbed and additionally compacted with a surface grinder;

- expansion joints are cut;

- the surface is covered with plastic wrap.

Fig.3. Technological stages of the screed device

2. GENERAL PROVISIONS

ORGANIZATION OF THE CONSTRUCTION PROCESS ON THE DEVICE OF FLOOR SCREED

2.1. Screed is a monolithic or prefabricated layer of relatively durable material in multilayer structures of floors and roofs of buildings. It is intended for the perception, distribution and transfer of loads (for example, on the roofs - snow cover, on the floors - the presence of people, cargo, equipment), for leveling the underlying layer or giving the cover layer of roof and floor structures a given slope, as well as for laying a finishing layer on them coverings, movement of equipment and people on it.

2.2. Work on the installation of a screed using fiber (construction micro-reinforcing fiber - VSM) must be carried out in accordance with the requirements of SNiP after completion of construction and installation work, during the production of which the screed may be damaged.

2.3. The screed can be installed at the air temperature at the floor level and the temperature of the underlying layer is not lower than 5 ° C, the temperature must be maintained for the entire duration of the work and until the screed acquires at least 50% of the design strength.

2.4. A screed from a hard semi-dry mortar, performed by a mechanized method, must be laid at once to the estimated height.

2.5. In order to prevent the transfer of deformations to the floor screed from the building structures along the walls, around the columns and foundations, insulating joints are arranged by laying insulating material ( damper tapes from foamed polyethylene, isolon, isocom) to the entire height of the screed immediately before laying the mortar.

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