Autoclaved aerated concrete block masonry?

What specific contents does autoclaved aerated concrete block masonry include? The following Zhongda Consulting Bidding Teacher will answer your questions for your reference.

Disclosure content:

Scope This technical disclosure is a special technical disclosure for the bricklayer's secondary structure wall building.

1. Analysis of key points and difficulties 1. Control of flatness and verticality of masonry: The geometric dimensions of selected blocks must meet the requirements of specifications, and consistent blocks should be selected. Masonry should be hung on both sides to control flatness and verticality.

2. Connection between blocks and Rachel bars: The Rachel bars planted with bars must be extended into the masonry and meet the anchorage length; The impurities and floating objects of the adhesive on the surface of the block must be cleaned up.

3. Overall strength of masonry: Mortar should have operability, good workability and water retention according to the mixture ratio, and the consistency should be 5-7 mm. According to the design requirements, the constructional column should be retained for the wall over 4m.

2. Construction preparation

1. Material preparation (1) Specification of autoclaved aerated concrete block: 1, 15, 2, 25, 3(2) Mortar is mixed mortar, and lime plaster is added in it, with the strength of M7.5(3) wall lacing φ 6

2. Machines and tools are ready for mixer, with the background.

3. Operating conditions

(1) The construction site is divided according to the building number, and the rebar planting project at the construction site must be completed before masonry can be carried out.

(2) The on-site storage site should be compacted and leveled, without water accumulation, and packed neatly. Handle with care during shipment to avoid damage. And stacked according to the drawings, to avoid reducing the secondary transshipment.

(3) according to the wall size and block specifications, the plane layout design shall be carried out before laying, so as to reduce the cutting amount on site as much as possible. According to the thickness of the block and the clearance height of the structure and the size of the hole of the doors and windows, the typesetting design of the facade and section is effectively arranged to avoid waste.

(4) The location of the aerated concrete block shall be marked out in layers on the structural wall according to the elevation line of+＋1mm, and the thickness of mortar joint shall be arranged.

(5) Before laying, build a 2mm high autoclaved fly ash brick at the root of the aerated concrete block wall.

(6) The day before the wall is built, the aerated concrete block should be wetted with water to ensure the masonry is firmly bonded.

(7) In case of wall-penetrating pipeline, its position and size shall be verified in advance. Give priority to reservation, and reduce the damage to wall stability caused by chiseling afterwards.

(8) model guide system: in order to unify the construction technology and quality of the infilled wall, the model guide system is adopted in each process according to the requirements of the supervision engineer. That is to say, before the construction of each working procedure, according to the requirements of technical disclosure, make a sample in the experimental building with faster progress, and the supervision engineer will check that it meets the quality requirements. After the supervision engineer has passed the inspection and acceptance and confirmed it in writing, large-scale construction can be carried out.

3. Basic treatment of construction technology → wall setting-out, block watering → building aerated concrete block → constructional column and ring beam pouring → ending → acceptance

1. Basic treatment: clean the surface of the brick or concrete belt at the root of the aerated concrete wall, level it with mortar, stay wires and check its flatness with a level.

2. wall setting-out: according to the requirements of design drawings, the size of the hole line of the wall body door should be well played at the corresponding position, and the vertical edge of the aerated concrete wall should be well played on the structural wall column. During construction, the moisture content of aerated concrete block should be controlled below 15%, and the block should be watered and wetted 24 hours before masonry, and the masonry surface should be saturated and dry.

3. Masonry aerated concrete block:

(1) When laying, arrange the blocks according to the wall width and the specifications and sizes of the blocks, and arrange them according to the typesetting design. If the blocks are not enough, they can be sawed to the required size, but not less than 1/3 (6× 1/3 mm) of the block length. The width of vertical joint is 2mm, and the horizontal mortar joint is 15mm. When laying, it shall be covered and crowded, and the upper and lower T-joints shall be staggered. The lap length shall not be less than 1/3 of the block length, and the corners shall be overlapped by biting each other.

(2) At the joint of aerated wall and column, Rachel reinforcement must be set according to the design requirements. The vertical spacing is 5mm, and 2φ6 steel bars are buried. Buried straight and laid flat in the horizontal mortar joint, with both ends extending into the wall not less than 7mm, and the end of Rachel bar needs to be bent 9 with a length of 4 mm..

(3) When the height of the filled wall is more than 4m and the height of the 12 brick wall is more than 3m, a reinforced concrete horizontal ring beam connected to the column and running through the whole length of the wall should be set at the half height of the wall or the epithelium of the door and window openings. The position is 1/2 of the height of the wall, and the height is 15 mm. The height of the ring beam set at the opening of doors and windows can be adjusted according to the height of doors and windows.

(4) When constructional column is constructed, Ma Yacha shall be set as required, and Ma Yacha shall be pushed backward first, and the advance and retreat dimensions shall be controlled at 6mm and the height shall be 3 mm. See the following figure for details:

(5) The aerated concrete infilled wall masonry shall be built at the corner and the junction of vertical and horizontal walls at the same time, and if it cannot be constructed at the same time, it shall be reserved.

4. Connecting blocks with doors and windows

(1) Precast concrete blocks shall be built with three blocks on each side within 2m of the hole height, and four blocks shall be built when the hole height is more than 2m, and the mortar around the concrete blocks shall be full and dense.

(2) When heavy doors and large external windows are encountered, reinforced concrete frames are made around the openings of doors and windows. Generally, the upper openings of doors and windows and the openings of windows and doors can be made into reinforced concrete Rachel belts, and the whole length of them runs through, so as to enhance the integrity of aerated concrete walls in weak parts such as doors and windows and openings. Doors and windows lintel length = hole span +2a, lo <; At 3, a=25, and Lo≥3, a=36. 5. When the wall is built to the bottom of beam and slab, it will be pressed obliquely with side bricks or vertical bricks, and the top surface of block wall will be pressed obliquely with clay bricks. The brick inclination is about 6, and the mortar should be full. Make 2mm equilateral triangular precast concrete blocks to close the head.

IV. Quality requirements and acceptance criteria

1. Axis displacement is 1mm verticality, 5mm flatness, 5mm door and window opening height, width and (back mouth) 5mm external wall upper and lower window deviation, 5mm

2. Masonry mortar joint should be horizontal and vertical, and mortar should be full. The plumpness of mortar joint shall not be less than 9%, and there is no penetration phenomenon.

5. Problems that should be paid attention to

1. Special tools should be used for sawing blocks, and axe or tile knife are not allowed to chop at will.

2. Masonry mortar must be mixed and prepared according to the mixture ratio given by the professional foreman of the project department.

3. When pouring concrete for constructional column and ring beam, different vibrating tools should be used for vibrating.

4. Overnight ash is prohibited, and it is cleaned every day.

VI. Civilized construction

1. In this project, scaffolding is not erected for wall building, and all movable frames are adopted.

2. During the external wall construction, there must be external wall protection and scaffolding, and the gap between the wall and scaffolding should be closed to prevent falling objects.

for more information about the engineering/service/procurement bidding, and to improve the winning rate, you can click on the bottom of official website Customer Service for free consultation:/#/? source=bdzd