Trimming the bottom die-welding and binding the bottom plate and web reinforcement-burying corrugated pipes-installing the outer die and the inner die-binding the top plate reinforcement-installing the corrugated pipes with negative bending moment-pouring the concrete of the bottom plate-pouring the concrete of the web plate and the top plate-demoulding and curing-threading.
Steel processing and binding
(1) box girder reinforcement has the characteristics of dense reinforcement, many bends, many embedded parts and high construction requirements.
The dimensions and specifications of reinforcement processing shall be carried out in strict accordance with the requirements of drawings and specifications.
Process flow of steel bar installation: binding the bottom plate and web plate steel bar-laying positive bending moment corrugated pipe-installing side formwork and internal formwork-binding the top plate steel bar-laying negative bending moment corrugated pipe.
For embedded steel bars such as drainage holes, expansion joints and crash barriers, their positions must be ensured to be accurate and must not be missed.
3 prestressed channel and anchor plate setting
The prestressed duct is made of steel corrugated pipe, which can be processed and cut according to the actual design size at the construction site as required. Bellows shall be installed in strict accordance with the design coordinates of the drawings, and positioning steel bars shall be spot-welded on the steel skeleton.
In order to ensure the smooth passage and prevent concrete slurry from blocking the pipe, the following measures are taken:
(1) The air duct joint is wrapped with adhesive tape to strengthen the tightness of the joint.
(2) When welding steel bars near the bellows, the bellows shall be protected. Check carefully after welding is completed.
(3) When pouring concrete, the vibrating personnel should be familiar with the position of the hole, and it is forbidden for the vibrating rod to directly contact the corrugated pipe, so as to avoid the deformation and displacement of the corrugated pipe due to vibration, resulting in excessive deviation of the hole size or slurry leakage of the corrugated pipe.
(4) Before pouring concrete, use an inch and a half thick plastic pipe to penetrate into the corrugated pipe, and twitch back and forth during pouring to prevent the corrugated pipe from being squeezed and deformed by concrete or vibrating rod.
4 anchor pad position should comply with the design requirements, and together with anchoring reinforcement, reinforcing reinforcement and spiral reinforcement, it should be reliably fixed on the formwork and steel mesh at both ends of box girder. In particular, the anchor pad is closely attached to the end mold, and it is not allowed to translate or rotate, so it can be pasted with adhesive tape.
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