Precautions for the safe use of box girder internal molds

I. Inner mold entry

1、The inner mold can be driven into the mold by the automatic longitudinal moving device of the inner mold or towed into the mold by the winch.

2, into the mold before checking: if through the mold automatic longitudinal transfer device into the mold, need to check the roller, drive system is good; if the winch into the mold, need to check the traction wire rope, pulley is intact; to confirm the normal, before the operation.

3、Installation of automatic longitudinal transfer device (automatic mold installation) or movable mold shifting bracket (traction mold installation), its longitudinal axis to correspond to the longitudinal axis of the box girder, adjusting the height of the bottom screw, the height of its rollers need to be the same as the middle of the bracket and the height of the rollers of the storage pedestal.

4, into the mold process, the observer should not stand in front of the traction rope and the two sides of the inner mold.

5, into the mold process to observe whether the track in the roller groove, in order to prevent derailment, the occurrence of the above situation, should immediately stop the action, to be troubleshooting before continuing into the mold.

II. Internal mold support

1、Before operating the inner mold action, make sure that there are no people or other objects in the action area and action track of the formwork.

2, according to the instruction manual steps required to operate the hydraulic system, control the inner mold open. Hydraulic system operation should be observed during the operation of the tank level is normal. Winter construction oil temperature below 10 ℃ or less, should start the tank heater to heat the hydraulic oil. In the process of use, pay attention to observe the motor, oil pump temperature rise, check the working pressure of the system, high-pressure connections are loose, in order to avoid abnormal accidents.

3、After the installation of the inner mold, check whether all the spiral braces are supported in place, whether the jacks at the end of the main beam are supported in place, and whether the connecting bolts at the end of the variable section are connected.

4, before casting the formwork should be part of the size of the inspection and measurement, to ensure that the relevant dimensions to meet the requirements before the concrete can be poured.

III. Pouring of concrete

Pouring the concrete symmetrically avoids shifting of the inner mold, which affects the relevant dimensions of the concrete.