Introduction of external wall construction practice?

Speaking of external wall construction practices? At present, how do construction enterprises carry out external wall construction, and what are the main construction technologies? The following is the relevant content of professional architectural terms of exterior wall building lines compiled by Bian Xiaozhongda Consulting Company. The basic situation is as follows:

Bian Xiao inquired through the architectural knowledge column of "Building Network", an encyclopedia website of the construction industry, and sorted out the relevant situation of external wall construction practices. The basic contents are as follows:

Construction technology of building exterior wall decoration;

1, external wall brick masonry control measures

(1) Exterior wall aerated concrete block shall be completed in more than two times. When it reaches the beam or roof, the masonry should be completely settled, and then the joint should be filled with mortar.

(2) Masonry requires that the horizontal and vertical joints of double-sided pointing should be controlled at 15mm, so as not to form blind joints and cut off the seepage channel.

(3) constructional column practices and structural measures: there should be horse teeth in the brick masonry at the position of each constructional column to ensure the bite force between brick masonry and concrete. When pouring constructional column concrete, three T-bolts are used for reinforcement, and the concrete must be vibrated and compacted.

2, exterior wall decoration stage control measures

(1) Exterior wall decoration practices: ① Leveling layer: Dura fiber waterproof mortar 12 thickness; ② Bottom layer: polymer waterproof mortar is 8 thick; ③ Waterproof coating: polymer waterproof coating LMM "④ Exterior wall coating.

(2) After the concrete cylinder is cleaned,1:1cement-based polymer mortar (cement, 107 glue, fine sand) is used as the bonding layer.

(3) At the junction of concrete wall and brick wall (nail the steel mesh with 200mm width and 10 ~ 12mm mesh on both sides, center it along the seam, and use @ 10~ 12mm nail.

(4) Before swinging the wall, clean the wall to prevent empty drum. Wall plastering is the key process of wall leakage prevention. The pores of the plastering layer should be cut off by smoothing and compacting the first layer of mortar. Appropriate Dura fiber can be added to the mortar to improve the cohesion of the mortar and make the external wall hydrophobic, impervious and leakproof. Cure in time after plastering. The leveling layer and the bottom layer should be connected smoothly, with the same color and no obvious seams. When the bottom mortar is dry to 67%, apply the second polymer waterproof mortar with a thickness of 8. Illuminate the surface. Whether there are empty drums, dry shrinkage cracks, obvious sand holes, dry pulp separation, etc. When checking, they must be chiseled off immediately, then cleaned and leveled with mortar of the same grade. After the completion acceptance, waterproof coating shall be applied on the bottom layer. The coating should be smooth and clean, with uniform brush layer and consistent luster.

(5) The distribution box and box on the inner side of the external brick wall must be checked in place during installation. Where the wall cracks to form blind joints, the cracked brick body must be removed and the other place should be laid densely. The gaps and holes of installed boxes, boxes and one-way pipes must be filled with 1: 2 cement mortar. It is forbidden to fill with broken bricks and residues. Holes larger than 200 ~ 200ram are required to be filled with fine stone concrete. Check that there is a dumb sound when knocking with a small stick, then pry it open for rework and fill it in.

(6) Before hanging the net and plastering the temporary scaffold hole of the external wall, align the hole with an impact drill larger than 1~2mm, and remove the plastic pipe and sundries in the hole. Then, drill a bell mouth with a depth of 20ram, which is larger than 1 times the diameter of the hole. After washing with water, use 1: 2 waterproof mortar to add expansion agent.

(7) The exposed iron embedded parts of the wall shall be leveled with 1: 1 cement mortar mixed with waterproof powder after cutting.

(8) Retain the partition according to the design drawing. After plastering, use hand-held sawing seam with a width of10mm and a depth of 5mm, and then use cement mortar mixed with 107 glue fine sand to tick off the seam. Joint width and depth are consistent, and lines should be straight and consistent. (9) After the completion of the external wall construction, the experiment is carried out by high-pressure jet method. If water seepage is found, find out the reason and handle it in time. 3. Construction technology 3. 1 Construction technology Basic treatment-Brush bottom coating-Brush waterproof layer-Exterior wall coating-Closed water test.

3, besmear brushs waterproof coating matters needing attention

(1) When coating waterproof layer, the coating sequence should be vertical plane first, then horizontal plane; Yin and Yang angle first, then bedding face details, and the waterproof coating sequence of each film should be perpendicular to each other:

(2) In the details such as the angle of Yin and Yang to be treated, consider adding a layer of reinforced paint or glass fiber cloth to make polymer cement mortar with small arc, and then make an additional waterproof layer with a width of 300mm; ;

(3) When coating the waterproof layer, it should be carried out after the previous layer of coating is cured and dried, and the residual pores or bubbles should be checked first;

(4) After the primer is dried and cured, evenly coat a layer of paint with a thickness of about 0.8 mm with a plastic or rubber scraper, and evenly apply the force. Control the total thickness of waterproof layer as 1. Omm； Strengthen local bubbles or pores and other defects. Or reapply the waterproof layer after removal.

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