How to Lay Foundation Bricks for Container Houses

The laying of foundation bricks for container houses should follow the following standardized procedures:

I. Construction Preparation

1. Materials and Tools: Select standard red bricks (240mm×115mm×53mm), cement (with a strength grade of ≥32.5), and medium sand. Tools include a total station, level ruler, wooden ruler, mixer, etc.
2. Foundation Treatment: Clear away soft soil or debris. For soft soil foundations, lay a crushed stone bedding layer with a thickness of ≥150mm and compact it to ensure a foundation bearing capacity of ≥100kPa.
3. Container Fixation: Hoist the container to the designated position, adjust it to a level state using a level instrument, ensure the contact surface between the bottom and the foundation is flat, and secure it using anchor bolts or welding.

II. Key Masonry Parameters

1. Brick Quantity Calculation: Taking a 6m×2.4m container as an example, with a foundation area of 14.4㎡ and a single brick area of 0.0138㎡ (including mortar joints), calculate the number of bricks using the formula Number of bricks = Foundation area / Single brick area × 1.05, requiring approximately 1200 red bricks. The foundation height is usually 3 layers of bricks (about 180mm).
2. Mortar Mix Ratio: Mix cement and sand in a 1:3 volume ratio. Each cubic meter of masonry requires 0.25m³ of mortar, with a strength grade of not less than M5. Stir for ≥2 minutes to ensure uniformity.

III. Masonry Process Points

1. Line Setting and Positioning: Use a total station to set out the foundation sidelines, with an allowable deviation of ±10mm; the diagonal error should be ≤5mm to ensure the foundation is square.
2. Masonry Method:
   • Adopt the "one stretcher and one header" masonry method, where one layer of stretcher bricks alternates with one layer of header bricks, with the thickness of mortar joints controlled between 8-12mm.
   • The daily masonry height should be ≤1.5m to prevent wall deformation due to unset mortar.
   • The verticality deviation should be ≤3mm/m, and the horizontal mortar joint fullness should be ≥80% (according to GB 50203-2011). Use a grid gauge to spot-check the mortar fullness.
3. Foundation Width: The foundation should extend 200mm beyond the edge of the container (i.e., total width = container width + 400mm) to ensure stability; the compressive strength of the masonry should be ≥7.5MPa, which can be tested using standard test blocks.

IV. Floor Tiling (Optional)

1. Wet Laying Method: After cleaning the floor and wetting it with water, lay a 1:3 cement mortar layer (25-35mm thick), scrape it flat with a wooden ruler, set out sample lines, sprinkle cement powder to enhance adhesion, and then lay the floor tiles.
2. Dry Laying Method: After applying a 1:0.4-0.5 cement paste, lay a 1:3 dry hard mortar layer (30-40mm thick), calibrate the flatness with a level ruler, and then lay the floor tiles and tap them firmly.

V. Curing and Acceptance After masonry is completed, cover with plastic film and sprinkle water for curing for 7 days to keep the mortar moist; it can bear weight only after the strength reaches 70% of the design value. During acceptance, check indicators such as foundation dimensions, verticality, and mortar strength to ensure compliance with specifications.

Precautions: It is recommended to use BIM modeling for pre-arrangement of bricks before construction to reduce cutting waste; if a simplified process (such as directly splicing bricks) is adopted, ensure that the connection between bricks is firm to prevent collision with the wall when using scaffolding.