1. formwork: after the formwork enters the site, try to assemble it first, and check whether the geometric dimensions and angles of the structure are consistent according to the drawings, and whether the assembled flat joints are tight and flat. Check the verticality of the vertical rib. (If the longitudinal slope of the bridge is large and the beam is high, the verticality of the beam end should be adjusted to ensure that the beam end face is parallel to the back wall when erecting the beam. )
2. Reinforcement processing and installation: firstly, part of the blanking is carried out according to the drawing design, and the bending angle and size are rechecked. If it can't meet the requirements of protective layer, it can be adjusted in time. The interference between the installation position and the embedded parts or steel beams should also be properly adjusted during installation. When adjusting, the reinforcement should avoid the steel beams and the distribution reinforcement should avoid the main reinforcement. Welding and mechanical connection should review the design and specification requirements.
3, corrugated pipe installation should be fixed firmly, accurate horizontal coordinates, coordinate measurement should be carried out after the bottom protective layer is accurately fixed, and the measurement should be carried out from both ends to the middle. At the same time, insist on whether it is burned by electric welding.
4. Installation of embedded parts: longitudinal slope control of leveling steel plate at the bottom of beam, angle and coordinates of anchor pad, location of grouting hole, embedded reinforcement of expansion joint and guardrail, etc. Location and number of ventilation holes at the bottom of the beam. Check the quantity and exposed length of embedded steel bars in cast-in-place parts such as corbel and cast-in-place section.
When installing the negative moment anchor pad, the part that penetrates into the anchor pad when wearing corrugated pipe should be wrapped tightly with double-sided tape, and the appropriate size should be worn, so as to avoid serious slurry leakage during concrete vibrating, and it is difficult to align the working anchor hole after wearing the beam, and the steel beam will break when tensioning.
5. Prestressed steel beam construction: firstly, confirm whether the passage is unobstructed, and then cut the material according to the actual stretching length and cross the beam. It is forbidden to burn by electric welding. Check whether the clamping piece is installed in place, check whether the limit plate corresponds to the anchor plate during initial tensioning, and whether the oil gauge number corresponds to the jack according to the scale. Tension at both ends should be synchronized.
6. Whether the materials are sufficient should be considered before concrete pouring. Trial mixing should be carried out for the first time, and the workability and slump of concrete should be adjusted appropriately until the best working performance is achieved. Someone shall be responsible for vibrating concrete and pouring it in the correct order. The interval of concrete pouring shall not exceed the initial setting time of concrete, and an emergency plan shall be made in advance. Strengthen the vibration of concrete under anchor. Make sure it is dense. When the surface is closed, the cross slope and roughness of the top surface should be controlled. The negative moment tensioning groove shall be cleaned and the depth shall meet the requirements of tensioning construction.
7, template removal and maintenance, should pay attention to protect the four corners of the beam from damage when ripping, timely cut hair and maintenance, should check the beam concrete pouring quality in time after ripping, whether the slurry leakage is serious, whether the anchor concrete is dense, whether the appearance color is consistent, etc.
8, hole grouting sequence should be bottom-up grouting layer by layer, other matters needing attention see the bridge regulations.
9, moving beam should be timely through the drain pipe. Temporary supports shall be semi-rigid materials.
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