17 m 17 m bridge balloon rubber balloon made of precast

17 m bridge balloon, 17 meters of rubber balloon made of prefabricated, wooden mold 1. drawback: the production process (1) wooden mold is quite complex, due to the irregular shape of the top of the arc treatment more difficult. To ensure that the design size, has conducted several test installation, wasting a lot of wood. (2) fixed difficult to prevent mold wood core shift, using a number of fixed points, but there is a small shift in the process of concrete vibrators, coated mortar pad too thick, too, and will Prefabricated quality impact. (3) stripping difficulties, in order to prevent the occurrence of prolonged and difficult stripping phenomenon within 2h after releasing initial setting of concrete, but the wooden mold form removal process is complex and long time; (4) the number of low turnover, in Stripping wood mold, due to severe deformation of wood, you need to re-assemble wooden mold, partial to re-production, waste of time and affect the quality, turnaround times and lower wood mold, a serious waste of wood. 2. rubber mandrel advantages: (1) the use of inflatable rubber mandrel process, make the whole plate girder precast construction progress greatly accelerated. (2) with a one-time investment of wooden mold compared to turnover inflatable mold can be repeatedly used, and the construction is simple and convenient, saving a lot of feed costs, economic benefit. (3) through a strict process control mandrel construction, precast hollow quality issues can be further guaranteed. Thirteen, construction technology box beam construction drawback is the process more complicated, such as the construction process when handled badly precast box girder inside the airbag module can directly affect the appearance of the box girder, and even affect the overall structure and mechanical properties of box girders . One of the most important process in the concrete pouring and vibrating part. 1. Open the box girder into the die-mold rolls balloon, the balloon with a prepared release agent brush a few times, you can use the rope pulling the balloon pulled into the steel cage, making inflatable mouth exposed, then The tee is connected to one end of the balloon, the other end of the yard with the installation of pressure gauges, as well as the other end connected to an air compressor. 2. Inflatable start inflating the balloon is due to made of rubber and the volume of the cavity pressure was relatively large, there will be the return air inflated phenomenon, so to alternately inflated in accordance with the instructions on the standard pressure, in order to avoid excessive pressure has led to the emergence of the airbag deformation. Use plants with a pressure gauge to control detects pressure, no excessive pressure when inflated.