Construction technology of hollow brick

1 scope

This technology is applicable to General clay hollow brick masonry engineering in industrial and civil construction.

2 construction preparation

2.1 materials and equipment:

2.1.1 hollow brick, solid brick: variety, size, strength class must conform to the design requirements, the specification should be consistent. Factory certificate, the test report form.

2.1.2 cement: No. 325 for general use slag Portland cement or Portland cement, factory certificate and retest report.

2.1.3 sand: suitable for sand, 5mm bore diameter sieves, preparation of M5 mortar, sand sediment not more than 10%,M5 and mortar, sand clay content of not more than 5% and it is grass-roots and other debris.

2.1.4 admixtures: use ground lime, fly ash, lime paste and so on. When cured lime shall not be less than 7d.

2.1.5 water: tap water or clean water that contains no harmful substances.

2.1.6 other materials: steel tie bar, embedded parts, wood bricks, be treated in advance.

2.1.7 main machine: equipped with mixer, dump truck, scale, skip, brick cages, trolleys, hose, sieve, spade, half grey buckets, spray bottle, holding Board, wire pendant, spirit level, small white lines, brick tongs, shovels, trowels, adzes, planing tool bags.

2.2 operating conditions:

2.2.1 load-bearing structure in the main Division has completed construction, already concerned Department.

2.2.2 pop-up axes, line the walls, doors and Windows opening lines, review, go through the preflight procedures.

2.2.3 vertical counting poles: should be made with 30mmx40mm wood, counting on a post marked door hole, wood bricks, tie bar, beam, beam size elevation. Counting rods spaced 15~20mm, corners shall be established, generally away from the wall or corner 50mm. Counting Rod should be vertical, strong, consistent elevation, after review, go through the preflight procedures.

2.2.4 according to the elevation of the first brick at the bottom, Latrun Ray, such as horizontal mortar joint thickness of more than 20mm, with fine stone concrete screed, not cut bricks with mortar or leveling Bao Hezi dry.

2.2.5 weather the day before laying the bricks at room temperature water wet, winter frost on the surface should be cleared.

2.2.6 mortar mix ratio determined by the lab, prepare mortar test mode.

3 operational processes

3.1 process:

Mixing mortar

↓

Laying brick pile construction preparation → → → concrete hollow brick wall at the end of test evaluation

3.2 prior to masonry Foundation wall or floor cleaning, water wetter.

3.3 in accordance with design drawings part size, end of laying brick pile, the Group built a reasonable, easy to operate.

3.4 mixed mortar:

3.4.1 mortar mix used to weight ratio, accuracy, ± 2% cement, sand and admixtures ± 5%.

3.4.2 should be treated with mechanical mixing and feeding sequence as a → → → cement admixture of sand water mixing time of not less than l.5min.

3.4.3 should mix with the use of mortar, cement or cement mortar mix after mix 3~4H out overnight mortar is strictly prohibited.

3.4.4 each floor or 250m3 strength of masonry mortar, a mixer should be at least one unit block (6 in each block), mortar, mix changes, you should make test block.

3.5 hollow brick masonry:

3.5.1 group build should be correct, the upper and lower joints, junction bite Cha ride building, corner serious block should not be used.

3.5.2 horizontal mortar joints should not be greater than 15mm, the mortar should be plump, flat along the straight, vertical joints with mortar filled.

3.5.3 hollow brick walls on the ground or first floor three rugged brick masonry, hollow brick masonry to beams or floor, built with brick skew jam and mortar filling.

3.5.4 hollow brick according to design requirements construction column and circle beam, lintel or concrete.

3.5.5 for reserved holes, embedded parts, etc, should be set according to the design requirements and avoid tick after cutting.

3.5.6 hollow brick walls on both sides of door and window frames with solid brick masonry, not less than 24cm on each side.

3.5.7 corner and junction with masonry, not straight Cha, high oblique Cha is less than 1.2m.

3.5.8 Latrun line when laying, bricklaying, crane, along with, ensuring wall vertical, smooth, not allowed to hit a brick wall.

3.6 winter rain during construction:

3.6.1 mixing mortar in winter should be treated with ordinary Portland cement and sand not included block of frost.

3.6.2 hollow brick dust, Frost and snow on the surface should be clean, tiles should not be watered, increasing mortar consistency.

3.6.3 doped salt mortar mixed with salt, material heating temperature according to the construction plan in winter regulations, mortar, using temperature should not fall below + 5 ° c. Tie bar, embedded with preservatives.

4 quality criteria

4.1 project:

4.1.1 the varieties, specifications for hollow brick, strength must conform to the design requirements, certificates, test reports of the factory.

4.1.2 mortar must comply with the design requirements and strength must be in accordance with the following provisions:

4.1.2.1 the same variety, the same strength grade mortar specimens in each group with an average intensity of not less than FM,k.

4.1.2.2 arbitrary set of test block strength not less than 0.75fm,k.

4.1.3 horizontal mortar joints of hollow brick masonry mortars full vertical seam packing density.

4.1.4 the corner straight Cha is prohibited, other parts should remain oblique Cha.

4.2 Basic project:

4.2.1 brick joints, each (at) 2 tile seams no more than 3.

4.2.2 Cha mortar dense seam brick straight, Cha horizontal mortar joint is less than 5mm or clear defects not exceeding 5.

4.2.3 tie bar, structural columns and reinforced concrete shall comply with the design requirements.

4.2.4 embedded embedded pieces of wooden bricks, compliance with the regulations.

4.3 allowable deviation, as shown in table 6-11.

Table 6-11

Tolerance (mm) method

1 axis displacement 10 theodolite or drawing a foot check

Top level ± 15 2 wall level and standard of inspection

Check every 5 2m supporting plate

3

≤ 10m 10 vertical using a theodolite or hanging, standard checking

>10m 20

8 2m m on foot 4 surface flatness, wedge-shaped foot check

Straight-10 10m 5 horizontal mortar joints, standard checking

Door hole width ¡à 5 10m long cable and check

(After) high +15,-5-foot check

+2 7 horizontal mortar joint thickness check with counting rods standard

8 structure of columns + 10 ' check

9 exterior window position from top to bottom and 20 using a theodolite or wait for check, subject to the window at the bottom

5 finished product protection

5.1 heating and plumbing, electrical pipes and embedded parts should be protected against collision damage.

5.2 embedded tie bar should strengthen the protection shall not be trodden down and fold.

5.3 trolleys should be smooth to prevent collision wall.

5.4 hollow masonry walls shall not be placed on the scaffolding and drainage to prevent the occurrence of accidents.

6 quality problems to be noticed

6.1 mortar strength is not enough: attention do not use cement, measure accurately to ensure mixing time, mortar test, maintenance and pressure test should be in order.

6.2 not straight on the top of the wall masonry couldn't make the top lines, uneven walls easily should be at the end of beam or plate pop-up wall edges, carefully press the line built to ensure top flat straight along the wall.

6.3 frames on both sides missed solid brick masonry: door solid brick masonry on both sides, facilitate laying of wood brick or metal, fixed door and window frames, and placed concrete lintels.

Tick after sinking 6.4 hollow brick wall: holes, embedded parts should be prepared to set aside reserve, embedded. After preventing tick, and so as not to affect quality.

6.5 pulling ties out of brick row: tie bar embedded in concrete walls, columns often do not coincide with brick mortar joints, should advance the brick line module control, location, elevation, tie bar is bent should not be used.

6.6 embedded in the wall or column within any of the tie bar is bent, cut: should be protected, not allowing any bent or cut off.

7 quality records

This standard shall meet the following quality records:

7.1 materials (hollow brick, solid brick, cement, sand, steel, etc) of factory certification, test report.

7.2 mortar sample test report.

7.3 quality inspection and assessment of the project.

7.4 hidden inspection, inspection records.

7.5 winter construction records.

7.6 design change and record of negotiation.

7.7 other technical documents.