The detailed installation process of the main body of the double-layer expanable container activity house is as follows

II. Foundation Construction Phase (Box - Body - Related Preparations)

(I) Foundation Construction

1. Selection and Execution of Foundation Type
   The choice of foundation type hinges on the geological conditions of the site and the load - bearing requirements of the container mobile house. Common options include independent foundations, strip foundations, and pile foundations (such as prestressed pipe piles and cast - in - place piles, suitable for soft soil layers). Take the independent foundation as an example. First, excavate foundation pits according to the designed foundation positions. The size of the foundation pit should be 100 - 200mm larger than the size of the foundation cushion. The depth is determined by the thickness of the frozen soil layer and the bearing capacity of the foundation (usually ranging from 0.5 - 1.5m). Then, pour a concrete cushion (with a thickness of generally 100mm and a strength grade of C15). After the cushion strength reaches more than 70%, bind the foundation steel bars (in accordance with the designed reinforcement requirements, generally using HRB400 grade steel bars), set up formwork, and pour foundation concrete (with a strength grade of C30 - C35). Proper concrete curing should be carried out (the curing time should not be less than 7 days).
2. Installation of Foundation Embedded Parts
   During the foundation construction process, accurately install foundation embedded parts, such as embedded steel plates and anchor bolts. The deviation of the plane position of the embedded steel plate should be controlled within ±2mm, and the deviation of the elevation should be ±1mm; the verticality deviation of the anchor bolts should be ≤1/1000, and the deviation of the top elevation should be ±2mm. The embedded parts should be reliably connected to the foundation steel bars to ensure a firm connection between the subsequent container modules and the foundation.

III. Container Module Installation Phase

(I) Installation of Bottom - Layer Container Modules

1. Positioning and Hoisting of Cranes
   After the crane is in position, adjust the angle of the crane jib and the slewing radius to ensure that there are no obstacles within the hoisting operation range. Use a special spreader (such as a container lifting beam) to reliably connect with the lifting points of the container module. When lifting, keep the container module stable. After lifting the module to a height of more than 500mm above the foundation top, rotate the crane jib to hoist the container module to above the foundation, and lower it slowly. Use a level and a theodolite to adjust the levelness and verticality of the container module. The levelness deviation should be ≤2mm/m, and the verticality deviation should be ≤1.5mm/m.
2. Connection and Fixing of Modules
   After the bottom - layer container module is in position, use high - strength bolts to connect the corner pieces of adjacent container modules. The tightening torque of the bolts must meet the design requirements (generally 200 - 300N·m, and a torque wrench must be used for strict control). At the same time, fix the container module to the foundation embedded parts by welding or bolting. When welding, ensure the quality of the weld (the height and length of the weld meet the design requirements, and there are no defects such as slag inclusion, air holes, or cracks). When bolting, add a spring washer to prevent loosening. For the parts that need to be connected by the inner corridor, install the steel structure frame of the inner corridor and reliably connect it to the container module.

(II) Installation of Upper - Layer Container Modules

1. Preparation for Hoisting Upper - Layer Modules
   After the installation of the bottom - layer container module is completed and accepted, carry out the hoisting operation of the upper - layer container module. First, install a hoisting auxiliary bracket (such as a temporary steel truss) on the top of the bottom - layer module to increase the stability and safety of the hoisting operation. At the same time, clean and inspect the connection surface on the top of the bottom - layer module to ensure that the connection surface is flat, clean, and free of debris and rust.
2. Hoisting and Connection of Upper - Layer Modules
   Use a crane to hoist the upper - layer container module. Keep the module stable during the hoisting process. After hoisting it to above the bottom - layer module, lower it slowly so that the corner pieces of the upper - layer module are accurately butted with the connection corner pieces on the top of the bottom - layer module. Use a level and a theodolite to adjust the levelness and verticality of the upper - layer module, with the same deviation requirements as the bottom - layer module. Then, use high - strength bolts to connect and fix the upper - layer module with the bottom - layer module and between adjacent upper - layer modules. The tightening torque of the bolts meets the design requirements. For the parts with expanded spaces such as terraces and canopies, install relevant components at the same time, such as the steel structure frame of the terrace and the support system of the canopy, and reliably connect them to the container module.

IV. Installation Phase of Enclosure and Components

(I) Installation of Wall and Roof Components

1. Installation of Exterior Wall Panels and Roof Panels
   If the container module is in a non - fully enclosed form (part of it is a frame structure), it is necessary to install exterior wall panels and roof panels. The exterior wall panels generally use lightweight insulated composite panels (such as rock wool sandwich panels, with a thickness of 50 - 100mm). Install them in accordance with the designed layout drawing. The panels are spliced using a tongue - and - groove method, and the joints are sealed with sealing strips to prevent rainwater leakage. When installing roof panels, lay them block by block from one end to the other. Fix them to the roof purlins using self - tapping screws, with a screw spacing of 300 - 400mm. And stick waterproof gaskets on the screw heads. The lap joints of the roof panels are waterproofed with waterproof rolls and sealants.
2. Installation of Doors and Windows
   Install the doors and windows 自带 by the container module or replace the doors and windows as required. Before installing the doors and windows, check whether the size of the opening meets the requirements and clean up the debris in the opening. The doors and windows are reliably connected to the steel structure around the opening using expansion bolts or nails. The gap between the door and window frame and the opening is filled with foam rubber, and the surface is sealed with sealant to ensure that the doors and windows can be opened and closed flexibly and have good sealing performance.

(II) Installation of Stairs and Railings

1. Installation of Stairs
   Install outdoor stairs (connecting the upper and lower layers of the double - layer container) or indoor stairs (at the inner corridor) according to the designed position. The stairs generally use prefabricated steel structure stairs. First, reliably connect the support components of the stairs (such as stair beams) to the container module or foundation embedded parts. Then, hoist the stair treads, adjust the slope and levelness of the stairs (the slope is generally 30° - 45°, and the levelness deviation is ≤2mm/m). Finally, weld or bolt the treads to the support components. The welded parts should be properly 防腐 - treated.
2. Installation of Railings
   Install railings on both sides of the stairs, around the terraces, and on the perimeter of the upper - layer container module. The railings are made of steel pipes or square steel and installed in accordance with the designed height and spacing (the height is generally 1.05 - 1.2m, and the spacing between vertical bars of the railings is ≤110mm). The railings are connected to the steel structure frame by welding or bolting. The welded parts are 防腐 - treated. After installation, ensure that the railings are firm, beautiful, and have good protective functions.