Images of House Prefabricated Beam Binding

Currently, images of house prefabricated beam binding cannot be directly provided, but the binding process and key details can be described in conjunction with construction specifications.

1. Process Flow of Prefabricated Beam Binding

The steel bar binding of prefabricated beams usually adopts a phased operation mode. Taking T-beams as an example, their steel bar binding is divided into two parts: the steel bars of the beam's bottom and web and the steel bars of the ballast trough slab, which are completed separately on dedicated steel bar binding pedestals. During the binding of the bottom and web steel bars, the positioning net for prestressed ducts needs to be installed simultaneously to ensure the accuracy of the duct positions. The steel bars of the ballast trough slab are bound separately and then combined with the bottom and web steel bars to form an overall framework.

2. Binding Pedestals and Auxiliary Tools

The steel bar binding pedestal is a key construction platform. Its surface is equipped with 胎卡具 for fixing steel bars (steel bar positioning fixtures) and pre-embedded part positioning devices, which ensure that parameters such as the spacing between steel bars and bending angles meet design requirements through mechanical limiting. For example, the error in the spacing between stirrups should be controlled within ±5mm, and the verticality deviation of pre-embedded parts should not exceed 1°. During the binding process, concrete spacers need to be arranged between the steel bars and the formwork, evenly distributed at a standard of no less than 4 per square meter, to form a protective layer (usually 25-50mm thick), preventing steel bar corrosion and ensuring structural durability.

3. Lifting and Subsequent Processes

The bound steel bar framework is lifted as a whole to the beam-making pedestal using a gantry crane. During the lifting process, dedicated lifting fixtures should be used to avoid deformation. After lifting, secondary adjustments are required to supplement any missing steel bars and install end pre-embedded parts (such as support steel plates and expansion joint devices). After passing the inspection by the supervision unit, rubber extraction tubes (used to form prestressed ducts) can be inserted to prepare for subsequent concrete pouring and prestressed tensioning.

4. Key Points for Safety and Quality Control

• Steel bar connection: Steel bars with a diameter of ≥22mm should preferably be connected mechanically (such as with rolled straight thread sleeves), while others can be welded or bound, but the lap length requirements must be met.
• Prestressed ducts: The rubber tubes should be firmly fixed to prevent floating or displacement during pouring, with a deviation controlled within ±10mm.
• Finished product protection: The bound framework should be covered with a waterproof cloth to prevent steel bar corrosion caused by rainwater erosion.

If actual construction images are required, it is recommended to obtain on-site image materials through engineering drawing sets, construction logs, or by contacting prefabricated beam manufacturers, or refer to the relevant illustrations in the Technical Specifications for Construction of Highway Bridges and Culverts (JTG/T 3650).