The construction process of a steel structure loft platform is a meticulous and systematic process. The specific construction steps are as follows:

I. Preliminary Preparation

1.  Determine Elevation ：

l  According to the location of the embedded parts, accurately measure the elevation of the loft floor to provide an accurate basis for subsequent construction.

1.  Material Preparation ：

l  Select suitable main beam materials, such as 120mm I-beams.

l  Ring beam materials, such as 40mm×80mm square steel.

l  Auxiliary materials, such as 50mm×50mm angle steel.

l  Chemical anchor bolts, expansion screws and other fasteners.

l  Sheet materials, such as core boards, integrated materials, etc.

II. Frame Determination and Fabrication

1.  Determine the Frame ：

l  Remove the wall paint, expose the channel steel, determine its position and size, as the basis for main beam cutting and connection.

l  The channel steel should be fixed 5mm deep in the wall according to the design requirements.

1.  Fabricate the Main Beam Frame ：

l  Use M12mm chemical anchor bolts to fix the channel steel.

l  The connection between the main beam and the channel steel adopts the plug riveting method to ensure the structural stability.

III. Steel Structure Fabrication and Installation

1.  Fix the Channel Steel Ring Beam ：

l  Fix the channel steel ring beam according to the size of the sheet material.

l  After drilling holes with an electric hammer impact drill, insert chemical anchor bolts.

l  After it has fully solidified, install the channel steel.

1.  Main Beam Installation ：

l  Measure the main beam size, ensuring one measurement per beam.

l  Overlap the I-beam main beams, and the nodes are 360° welded.

l  The center-to-center spacing is controlled at around 610mm.

1.  Secondary Beam and Auxiliary Material Installation ：

l  Install the secondary beams and auxiliary materials according to the design requirements to ensure structural stability.

IV. Sheet Material Installation and Reinforcement

1.  Sheet Material Installation ：

l  According to the type of sheet material selected (such as core board, integrated material, etc.), lay the sheet material.

l  The joint position should be placed on the I-beam or angle steel to ensure that the overall structure is evenly stressed.

1.  Reinforcement with Steel Wire Mesh ：

l  Use steel bars to connect the wire mesh above the plywood, the specification is usually 200mm×200mm.

l  The steel bars are welded at both ends, and the intermediate joints are connected with thin iron wire.

V. Rust Removal and Rust Prevention Treatment

1.  Rust Removal Treatment ：

l  Use tools such as iron brushes and sandpaper to remove rust and dust from the surface of the steel structure.

1.  Rust Prevention Treatment ：

l  Apply two coats of rust-proof paint to ensure that the surface of the steel structure is rust-free and dust-free.

VI. Quality Inspection and Acceptance

1.  Quality Inspection ：

l  Conduct a comprehensive inspection of the welding quality and installation accuracy of the steel structure.

l  Ensure that all connection points are firm and reliable, with no loosening.

1.  Acceptance ：

l  Acceptance is carried out according to relevant quality standards to ensure that the steel structure loft platform meets the design requirements and usage needs.

VII. Subsequent Construction and Maintenance

1.  Subsequent Construction ：

l  After the completion of the steel structure loft platform, subsequent construction such as floor decoration and wall decoration can be carried out.

1.  Maintenance ：

l  Regularly inspect and maintain the steel structure loft platform to ensure its long-term stable operation.

The construction process of a steel structure loft platform includes several stages: preliminary preparation, frame determination and fabrication, steel structure fabrication and installation, sheet material installation and reinforcement, rust removal and rust prevention treatment, quality inspection and acceptance, and subsequent construction and maintenance. Each stage must be operated strictly in accordance with construction standards and requirements to ensure the quality and safety of the steel structure loft platform.