Key points and technology of indoor floor production

Construction technology of ground leveling layer

1. 1 material requirements

(1) cement: Portland cement, ordinary Portland cement or slag Portland cement shall be used, and its strength grade shall be above 32.5.

(2) Sand: washed medium sand or coarse sand should be selected, and the silt content should not be greater than 3%.

(3) Pebble: Pebble or gravel, the maximum particle size is not more than 2/3 of the thickness of the cushion, and the silt content is not more than 2%.

1.2 Main mechanical equipment

(1) According to the construction conditions, the basic principle is to reasonably select suitable machines, tools, equipment and auxiliary devices, and meet the design requirements, giving consideration to the schedule and economic requirements.

(2) Common machines and equipment include: wooden rake, shovel, string, steel ruler, rubber hose, wooden clapper, scraping bar, wooden trowel, iron trowel, etc.

1.3 operating conditions

(1) Covered concealed works have been accepted, and concealed inspection has been countersigned.

(2) Before construction, horizontal signs should be made to control the laying height and thickness, and methods such as straightedge, stay wire and elastic line can be adopted.

(3) Technical disclosure was made to all operators.

(4) The working environment such as weather, temperature and humidity should meet the requirements for the construction quality to reach the standard.

2. 1 process flow

Check the quality of cement and sand-mixture ratio test-technical disclosure-prepare machines and tools-clean the base-find the elevation-mix-lay concrete cushion-vibrate-maintain-accept.

2.2 Operation process

(1) Base treatment: Clean the laitance and floor ash on the base with chisel or wire brush, and then clean the eluvial soil with broom.

(2) Find the elevation: according to the horizontal standard line and design thickness, pop up the upper elevation control line of the cushion layer on the surrounding walls and columns. Pull the leveling pier horizontally according to the line (60mmX60mm square, with the same height as the finished surface of the cushion, using the same pisolite concrete or the same mortar), and the distance between the two directions is not more than 2m. For rooms with slope requirements, pull the line according to the design slope requirements, and remove the slope pier. When mortar is used as leveling layer, reinforcement should also be washed.

(3) stirring:

1) The feeding sequence of concrete is gravel-cement-sand-water. Water consumption should be strictly controlled and mixed evenly.

2) The mixture ratio of mortar shall be determined by experiments according to the design requirements. The feeding must be accurate, and the ratio or volume ratio should be controlled. Water consumption should be strictly controlled and mixed evenly.

(4) Masonry: Before masonry, the base should be wetted, and plain cement slurry or interface binder should be brushed on the base. Mortar should be spread with the brush, and the evenly mixed concrete should be spread indoors.

(5) Concrete vibrating: pave the concrete with a spade, the thickness of which is slightly higher than that of the leveling pier, and then vibrate it with a flat vibrator. When the thickness exceeds 200mm, an internal vibrator should be used, and its moving distance should not be greater than 1.5 times the action radius, so as to avoid vibration leakage and ensure the compactness of concrete.

(6) Leveling: Take the horizontal control line and leveling pier on the wall column as signs, check the flatness, shovel off the high ones and fill the depressions. Leveling with a horizontal scraping bar, and then rubbing the surface with a wooden trowel. If there is any slope requirement, it shall be carried out according to the slope required by the design.

(7) Maintenance: After the construction is completed, cover and spray water for maintenance around 12h, and personnel are prohibited from coming in and out. Generally, the maintenance period is not less than 7d.

3 general projects

(1) The allowable deviation of the leveling layer surface is 4 mm ..

(2) Inspection method: laser levels inspection.

4 Preventive measures

4. 1 working environment

It should be continued and completed as soon as possible. Control the water consumption for washing the ground.

4.2 The concrete is not dense

(1) The base is not cleaned and wet by water, which affects the bonding force between the base and the cushion;

(2) Leakage or insufficient vibration during vibration;

(3) the mixture ratio is not allowed.

4.3 the surface of mortar is uneven

Mainly leveling concrete after laying, not timely leveling according to the line, to be timely screeding when the initial setting of cement, control time, to be leveled at any time during the laying process.

4.4 Irregular cracks

(1) The cushion area is too large, and it is not poured in layers and sections;

(2) uneven settlement of ground backfill;

(3) Insufficient cushion thickness or excessive pipelines.

4.5 mortar empty drum, sand

(1) The base is not cleaned and wet by water, which affects the bonding force between the base and the cushion;

(2) The mixture ratio is inaccurate and there is no need for maintenance.

(3) Do not grasp or do not do sand rubbing and pulp collection.

4.6 Unqualified

All unqualified parts should be reworked and corrected, and corrective measures should be formulated to prevent recurrence.

5 finished product protection

(1) During construction, pay attention to protect the positioning pipeline, and it is not allowed to be bruised or displaced.

(2) Covered concealed works shall have reliable protection measures, and shall not be leaked, blocked, damaged or degraded due to concrete pouring.

(3) After completion, it should be covered and sheltered in the maintenance process to avoid infringement.

6 Safety and environmental protection measures

(1) During transportation, stacking and construction, attention should be paid to avoiding dust, scattering and adhesive tape, and necessary measures such as covering, sealing, watering and washing should be taken.

(2) The noise of construction machinery should meet the requirements of environmental protection.

(3) Temporary electricity utilization for construction shall comply with safety management regulations.

7 quality records

(1) material certificate.

(2) notice of mixture ratio of technical director of the company.

(3) Strength test record and quality evaluation form.

(4) leveling layer subentry project quality acceptance evaluation record.

(5) Take cover engineering acceptance record.