Scope This technical confession is a special technical confession aimed at the secondary structural wall masonry of the mason class.

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

　　2. Block and tie bar connection: the tie bar of the planted bar must be extended into the masonry to meet the anchoring length; the impurities and floating objects on the surface of the block must be cleaned up.

　　3. The overall strength of the masonry: The mortar should have operability, good workability and water retention according to the mix ratio. The thickness should be 50-70mm. According to the design requirements, the wall should be more than 4m with structural columns.

　　 2. Construction preparation

　　1. Material preparation (1) Autoclaved aerated concrete block Specifications: 100, 150, 200, 250, 300 (2) The mortar is a mixed mortar with lime paste inside, and the strength is M7.5 (3) Wall reinforcement Φ6

2. Equipment preparation mixer, backstage measuring equipment, 5mm sieve, trolley, big shovel, shovel, knife saw, toothed blade, wire hammer, wire support board, small white wire, ash bucket, ash laying shovel, small hammer, small bucket, Levels, mortar buckets and vertical transportation tools, etc.

　　3, operating conditions

　　 (1) The construction sites are divided according to the building number, and the rebar planting works of the construction sites must be completed before masonry can be built.

　　 (2) The on-site storage site should be compacted, leveled, free of water, and stacked neatly. Handle with care during shipment to avoid damage. And stack them according to the drawings to avoid reducing secondary transportation.

　　(3) According to the wall size and block specifications, a graphic layout design is carried out before masonry, so as to reduce the amount of on-site cutting as much as possible. According to the thickness of the block, the clear height of the structure, and the size of the door and window openings, the layout design of the facade and section should be arranged to avoid waste.

　　 (4) The position where the aerated concrete block is laid is on the structural wall according to the +1000mm elevation line to delineate the number of layers of the block, and the thickness of the mortar joint is arranged.

　　(5) Before masonry, a 200mm high autoclaved fly ash brick is built at the root of the aerated concrete block wall.

　　 (6) The day before the wall is built, the aerated concrete blocks should be sprinkled and moistened with water to ensure that the masonry is firmly bonded.

　　(7) In case of wall pipelines, their location and size should be verified in advance. It is mainly reserved to reduce the damage to the stability of the wall by picking and chiseling afterwards.

　　 (8) Model Leading System: In order to unify the infill wall construction technology and construction quality, the model leading system is adopted for each process construction in accordance with the requirements of the supervision engineer. That is to say, before the construction of each process, according to the requirements of the technical disclosure, make a prototype in the laboratory building with a faster progress, and the supervision engineer will check and meet the quality requirements. After the supervision engineer has passed the inspection and acceptance and confirmed in writing, large-scale construction can be carried out.

　　3. Construction process: grassroots treatment → wall laying out, block watering → laying aerated concrete blocks → constructional column and ring beam pouring → finishing → acceptance

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

　　2. Wall line-out: elastic line according to the design drawing requirements, elastic line of the wall door opening size line in the corresponding part, and the vertical side line of the aerated concrete wall on the structural wall column. During construction, the moisture content of the aerated concrete block should be controlled below 15%, the block should be watered and moist 24h before the block is built, and the masonry surface should be saturated and dry.

　　3. Building aerated concrete blocks:

(1) According to the width of the wall and the size of the block during masonry, arrange the blocks according to the typesetting design. ×1/3mm). The vertical seam width is 20mm, and the horizontal gray seam is 15mm. When masonry is laid, the floor is full and the upper and lower T-shaped joints are staggered. The overlap length should not be less than 1/3 of the length of the block. The corners are bitten and overlapped.

　　 (2) At the junction of the aerated wall and the column, tie bars must be set according to the design requirements. The vertical spacing is 500mm, and 2φ6 steel bars are buried. Buried straight and flat in the horizontal mortar joint, both ends extend into the wall not less than 70mm, and the ends of the tie bars need to be bent by 40mm long and 90°.

　　 (3) When the height of the filling wall exceeds 4m and the height of 120 brick wall exceeds 3m, a reinforced concrete horizontal ring beam connected to the column and penetrating along the full length of the wall shall be set at the half-height of the wall or the upper skin of the door and window opening. The location is 1/2 of the wall height, and the height is 150mm. The height of the ring beam can be adjusted according to the height of the door and window when encountering the door and window opening.

　　 (4) During construction of the structural column, the horse yacha should be set as required. The horse yacha should be pushed first and then moved in. The advance and retreat dimensions are controlled at 60mm and the height is 300mm. The specific method is shown in the following figure:

　　(5) The aerated concrete infill wall masonry shall be built at the corners and the junction of the vertical and horizontal walls at the same time. When the construction cannot be performed at the same time, it shall be left as an oblique chase.

　　 4. Blocks are connected to doors and windows

　　(1) Prefabricated concrete blocks, three blocks on each side according to the height of the opening within 2m, four blocks when the height of the opening is greater than 2m, the mortar around the concrete blocks should be full and dense.

　　 (2) When encountering heavy doors and large external windows, the periphery of the door and window openings is made of reinforced concrete frames. The upper openings of doors and windows and window openings can generally be made of reinforced concrete tie bands, and the full length is penetrated to enhance the integrity of the aerated concrete wall in weak parts such as door and window openings. Door and window lintel length = opening span + 2a, when Lo<3000, a=250, when Lo≥3000, a=360. 5. When the wall is laid to the bottom of the beam and the slab, use side bricks or standing bricks to top it tightly. The top surface of the block wall is tightly built with clay bricks obliquely, the brick slope is about 60°, the mortar should be full, and 200mm equilateral triangle precast concrete blocks are made for closing.

　　 Fourth, quality requirements and acceptance criteria

　　1, axis displacement 10mm verticality, 5mm flatness, 5mm door and window opening height, width, (rear entrance) ±5mm outer wall and lower window offset, ±5mm

　　 2. Masonry mortar joints should be horizontal and vertical, with full mortar. The fullness of the mortar shall not be less than 90%, and the phenomenon of penetrating joints is not allowed.

　　 Five, should pay attention to the problem

　　 1. Special tools should be used to cut and saw blocks, and it is not allowed to chop arbitrarily with an axe or brick knife.

　　2. Masonry mortar must be mixed and prepared in accordance with the mixing ratio given by the professional foreman of the project department.

　　3. Different vibrating tools should be used to vibrate the structural columns and ring beams when pouring concrete.

　　 4. The use of overnight ash is prohibited, and overnight ash is cleaned up every day