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What are the construction steps for the installation of the guard booth?

What are the construction steps for the installation of the guard booth?

The steel cabin construction steps include earthwork excavation, foundation access inspection, construction layout, reinforcement processing, reinforcement connection, formwork works, concrete works and masonry works. The following is a detailed introduction:

  • 1. Earthwork excavation

The earthwork excavation adopts mechanical excavation, which is 200mm higher than the design elevation, and adopts manual trimming and bottom collection. After digging to the design elevation, the foundation pit should be drilled, and the soft soil layer should be cleaned up to obtain a good soil layer. Lime 28 soil.

  • 2. Base groove inspection

After the excavation reaches the design elevation, the construction unit, the design unit and the supervision unit are required to review and accept it, and the concrete cushion will be poured immediately after being signed and agreed by multiple parties.

  • 3. Construction arrangement

The base of the sentry box is built in two steps, the first step is to build the base, and the second step is to build the ground beam. After excavation of foundation pits that do not meet the bearing capacity requirements, they are replaced with crushed stone powder after compaction. The replacement depth is 600mm, the replacement width is +200mm on each side, and the standard value of bearing capacity should reach 180KPA after replacement.

  • 4. Rebar processing

1) Before using the steel bar, it must be observed and sampled on site, and sent to the testing center for testing before it can be used.

2) Equipped with two steel bar processing machines for steel bar processing.

3) Before cutting steel bars, a list of steel bars batches should be prepared in strict accordance with the design drawings and construction specifications, and sent to the project department for review. When the steel bar is blank, the lost length of the steel bar during welding must be considered.

4) The steel bars are concentrated on site, mainly processed and formed on site, and the steel bars are stacked according to the type. Stirrups are neatly stacked according to size.

  • 5. Rebar connection

1) The vertical connection of truss columns, truss beams and foundation steel bars adopts electroslag welding, and the horizontal connection adopts lap connection. However, the location of the rebar joints must comply with construction specifications.

2) When electroslag pressure welding is used, the welded joints arranged in the same member shall be staggered, and the same steel bar shall not have two joint bars from the center of any joint to the section whose length is 35 times the diameter of the steel bar. Not less than 500 mm; the cross-sectional area of ​​the tensile steel bar of the joint should not exceed 50% of the total area, and the compression area is not limited. The same bar cannot have two joints on the same section. The distance between the vertical steel bar joint and the floor slab must meet the design requirements.

  • 6. Template engineering

Formwork engineering is an important part of concrete structure engineering. The formwork and its supports must have sufficient strength, stiffness and stability, and can reliably withstand the self-weight and lateral pressure of steel and concrete, as well as construction loads, to ensure the correctness of structural engineering and geometry. Mutual size and location of components. Therefore, the construction of the formwork project is extremely important and the key to the construction.

  • 7. Concrete engineering

The foundation does not leave construction joints, and the continuous pouring is completed at one time; the contact surface of the beam and the superstructure must be scraped flat before pouring concrete. After wetting, the bottom must be filled with cement mortar with a thickness of 50-100 mm in the same proportion as the original concrete. When pouring, the thickness of each pouring is controlled at 1.25 times the length of the vibrating rod, generally about 500 mm. The lower layer of concrete must be poured before the initial setting of the upper layer of concrete, and the vibrating rod must be inserted into the lower layer about 50mm to ensure good concrete joints.

Construction joint treatment: After the concrete reaches a certain strength, the artificial chisel hairs are in the shape of stars. After watering and wetting, the same mixing mortar is used to spread the thickness of 20-50MM.

  • 8. Masonry works

The masonry work of this project includes standard brick masonry and aerated concrete blocks.

After removing the main formwork, insert the masonry structure.

The centralized mortar mixing station is installed on site and transported to the site by bucket trucks.