Brick and concrete structure, the structure column and ring beam and joints, concrete construction technology

Brick and concrete structure, column, beam and slab concrete construction

1 scope

This technology is applicable to masonry, exterior brick mold, plate internal model structure column and ring beam and slab concrete placement process.

2 construction preparation

2.1 materials and tools:

2.1.1 cement: 325~425, slag Portland cement or Portland cement.

2.1.2 sand: use coarse sand or sand, concrete C30, when the clay is less than 5%.

2.1.3 stones: structure column and ring beam diameter: 0.5~3.2cm pebbles or gravel; Board size 0.55~1.2cm of fine aggregate, concrete C30, when the clay is less than 2%.

2.1.4 water: clean water not containing impurities.

2.1.5 admixtures: selected according to requirements such as early-strength admixture, superplasticizer, mixing amount determined by the laboratory.

2.2 operating conditions:

2.2.1 concrete mixing ratio determined by the lab, mix order consistent with the on-site use of materials.

2.2.2 template solid, stable, levels, dimensions are in line with design requirements and template gap more than rules, to plug the tight and go through preflight procedures.

2.2.3 reinforced through hospital procedures.

2.2.4 structure, ring beam Cha loose concrete and mortar should be removed, template clutter to clean up.

2.2.5 at room temperature, before concrete pouring, brick walls, some shoe trees in advance watering moist, but not water.

3 operational processes

3.1 process:

Ready concrete mixer → → → transport → concrete, concrete vibration concrete curing

3.2 concrete mixer:

3.2.1 according to determination of the moisture content of sand, stone, adjust the mixing ratio of water, rain should increase the number of determination.

3.2.2 mixer weight per dosage of various materials and the wagon which are fixed well cement (bulk), sand, and stone all scales of scalar. Scales should be regular checks, maintenance, in order to ensure accurate measurement. Measurement accuracy: ± 2% of cement and admixtures, ± 3% aggregate, water, additives ± 2%. Blender shed should set concrete signs.

3.2.3 mixed mixer to empty before commissioning, normal before the official charge mixing.

3.2.4 sand, gravel, cement (in bulk) must be strictly according to the required quantity weighed separately, must also be strictly measured by adding water.

3.2.5 mixing procedure: General stone, pour cement, after sand, add water. Admixture in cement when I joined. Additive and water added.

3.2.6 concrete stirring first set, can be appropriate when loading less than stones or increase the cement and water.

3.2.7 concrete mixing hours 400L fell mixer should normally not be less than 1.5min.

3.2.8 the slump, general control in 5~7cm, each class should be measured twice.

3.3 concrete transport:

3.3.1 concrete mixer after discharge, should be transported by dump trucks, trolleys or skip to the placement locations. Delivery of concrete, preventing the loss of slurry. If the segregation should be placing artificial secondary sites mix.

3.3.2 finished pouring concrete mixer after unloading duration, when concrete C30, and temperatures above 25 ° c must not be greater than when 90min,C30 above shall not be greater than 60min.

3.4 concrete pouring and tamping:

3.4.1 roots of constructional column construction joints, first before pouring in Pu 5cm mix the same amount of cement mortar and concrete or stone concrete.

3.4.2 casting method: used cranes skip when feeding, you should skip down to a distance of the 50~60cm plate, the concrete landing on an iron plate, then poured into the mold with a spade, unloaded the skip is not applied directly to the concrete into the mold.

3.4.3 when concrete structural column, first insert the vibrator base and roots, making it vibration and then filled with concrete, should be stratified placement, vibrating, each ply not exceeding 60cm, edge cutting edge vibration, usually pouring height should not be more than 2m, such as to ensure that poured dense, pouring each time.

3.4.4 vibrated concrete: constructed string is vibrating, vibrator close wall insert. Vibrated concrete ring beam, vibrator-concrete surface should be oblique, oblique to the vibration. Concrete vibrating plate joints, 30mm should be used a small vibrator. Vibrating layer thickness should not exceed 1.25 times of the vibrator.

3.4.5 when pouring concrete, to protect steel and outer brick walls, waterproof wall panel structure, without the damage, the specialist check for deformation of formwork, reinforcement, and shift; bolt, lever is loose, fall off; found leakage phenomenon, assign specific maintenance.

3.4.6 surface smoothing: ring beam and slab concrete vibrating finish time, then use wood trowel to compact, smooth. Surface must not have loose concrete.

3.5 curing: concrete pouring out 12h, should cover the concrete and water conservation. When watered at least twice daily, curing period shall not be less than 1d.

3.6 complete concrete construction records, production of concrete blocks.

4 quality criteria

4.1 guarantee project;

4.1.l cement, sand, stone, additives must comply with the specifications and the relevant provisions of the standard, factory certificate, the test report.

4.1.2 concrete Proportioning, mixing, curing and treatment of construction joints, in line with the norms.

4.1.3 standard on concrete samples, production, maintenance and testing, evaluation of concrete strength and meet design requirements.

4.2 Basic project:

Vibration compacting of concrete, without dew the honeycombs, hole reinforcement and crack and slag.

4.3 allowable deviation, as shown in table 4-31.

5 finished product protection

5.1 placing concrete shall not pollute water brick.

5.2 when vibrated concrete shall not touch steel, embedded, preventing displacement.

5.3 bend reinforcement bars, step on, when you transfer or release, adjustment, patched in a timely manner.

5.4 scattered on the concrete should be cleared in a timely manner on the template.

6 quality problems to be noticed

6.1 material inaccuracy of concrete: influence of concrete strength and construction to check before, good correction scales, truck weighed, water must be strictly controlled.

6.2 concrete appearance of honeycomb, cavities, exposed ribs, slag and other defects: false vibrated concrete, leak, and reinforced protective pad is missing, especially reinforced position within the joints should be carefully checked, identify problems and deal with.

7 quality records

This standard shall meet the following quality records:

7.1 materials (cement, sand, stone, admixture, admixture) factory certificates, test reports.

7.2 test report concrete block.

7.3 quality inspection and assessment of the project table.

7.4 hidden inspection, inspection records.

7.5 winter construction records.

7.6 design change and record of negotiation.

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