What are the acceptance criteria for the construction quality of masonry structures?

The Code for Acceptance of Construction Quality of Masonry Structure Engineering requires both materials and construction quality. Materials require that the varieties, specifications and strength grades of bricks must meet the design requirements, and there are test reports. Masonry mortar should apply for mixture ratio according to the design requirements before laying, and the blocks on the construction site should be neatly stacked. In construction engineering, it is required that the consistency of masonry mortar after mixing should be 60 ~ 80 mm, and random sampling should be used for compressive strength test. When laying brick masonry, the brick should be watered and wetted 1 ~ 2 days in advance.

material requirements

1, the variety, specification and strength grade of brick must meet the design requirements, and should have product certificate and performance test report. After entering the site, samples should be taken, and they can only be used after passing the test.

2. Masonry mortar shall be applied for mixture ratio according to design requirements before masonry, and materials shall be measured in strict accordance with the notice of mortar mixture ratio during construction, and fully stirred.

3, the construction site block should be neatly stacked, stacking height should not exceed 2m, there are rain requirements to prevent rain and drainage, block to keep clean.

Construction engineering quality control

1, and the consistency of masonry mortar after mixing is 60 ~ 80 mm

2. Masonry mortar shall be randomly sampled as required, and the retained test block shall be sent to the laboratory for compressive strength test. On-site masonry mortar should be used with mixing, and cement mortar and cement mixed mortar must be used within 2h and 3h after mixing.

3. When building brick masonry, the brick should be watered and wetted in advance 1 ~ 2d. The moisture content of ordinary brick and perforated brick should be10% ~15%; The moisture content of lime-sand brick and fly ash brick should be 8% ~ 12%. The simplified method of spot-checking the moisture content of bricks can be used to break bricks on site, and the melting water depth around the brick section is 15 ~ 20 mm, which is considered to meet the requirements.

When using lightweight aggregate concrete small hollow blocks or autoclaved aerated concrete blocks to build infilled walls, the bottom of the walls should be built with sintered ordinary bricks or perforated bricks or small concrete hollow blocks, or concrete piers should be poured on site, and the height should not be less than 200mm, and concrete piers should be poured within 200 mm of all wall bottoms in toilet and bathroom rooms with waterproof requirements.

Before wall masonry, try to arrange blocks on site. The principle of block arrangement is staggered joints, and the overlapping length of blocks should not be less than 65438+ 0/3 of the block length. If the block length is less than or equal to 300mm, its lap length shall not be less than 1/2 block length. When the lap length is insufficient, the Rachel reinforcement should be placed in the mortar joint.

Before masonry, a number of skin poles should be set up, which are located at the junction of the four corners of the house and the internal and external walls, with the spacing of 10 ~ 15 mm, and masonry should be done in blocks according to the number of skin poles.

The mortar joint of brick masonry should be horizontal and vertical, with uniform thickness. The thickness of horizontal mortar joint and the width of vertical mortar joint should be 10mm, but not less than 8mm and not more than 12 mm. The masonry method should adopt the "trinity" bricklaying method, that is, the operation method of "shoveling and kneading". The vertical mortar joint shall be filled by squeezing or adding mortar, and it is forbidden to flush the mortar joint with water. When the slurry laying method is adopted, the slurry laying length shall not exceed 750 mm, and when the construction temperature exceeds 300C, the slurry laying length shall not exceed 500 mm..

The arrangement of blocks shall adopt the main specifications as far as possible. In addition to the necessary parts, the hollow brick masonry should be embedded as little as possible, and the positions where the bricks need to be embedded locally are easy to be dispersed and symmetrical, so that the masonry can be evenly stressed. When laying the external wall, do not leave feet, hands or eyes, but use inner feet or double-row feet. The holes, grooves, pipes and embedded parts specified in the design shall be reserved and embedded with the build by laying bricks or stones, and shall not be chiseled away afterwards.

If the vertical and horizontal walls are laid as a whole, the inclined wall can be temporarily dragged, and the horizontal projection length of the inclined wall should not be less than 2/3 of the height. If, should first clean up the base surface, water wet, and then spread slurry build by laying bricks or stones, and make the mortar joint full. Braces on structural columns of frame columns should be placed accurately and firmly, and their exposed parts should not be bent arbitrarily during construction. When electric pipes are buried on the wall, they can only be buried vertically, and horizontal slots are not allowed. When opening the vertical seam, it is not allowed to chisel with a hammer or axe, and the diameter of the electric tube should not be greater than 25mm. Fix the pipe valve according to the regulations, wash away the powder with water and fill it with mortar. Buried pipe valves should be completed before plastering.