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申请号90209663.X 公告号CN2070784U 这种工具门槛用于带门洞的预制混凝土内、外墙板及盒子构件的浇注成型,既可保证门洞的准确尺寸,又可保证构件在运输过程中不致被碰坏,见图1.采用工具门槛具有下列优点:(1)省略一根预制混凝土门槛;(2)无需在安装完毕后将预制混凝土门槛凿去;(3)节省材料和后处理费用。这种混凝土预制构件预留门洞工具门槛由1个钢板焊成的槽形框架、花篮螺栓和两根各有一头镦粗并带卡环的螺杆组成。钢板槽形框架内设有2块带通孔的横肋板,用以增强槽形框架的刚度和保证卡环螺栓的位置。框架两端与门洞相接触的端部封
Application No. 90209663.X Bulletin No. CN2070784U This kind of tool sill is used for the casting of pre-cast concrete inner and outer wall panels and box members with a door opening. It can not only ensure the accurate size of the door hole, but also ensure that the components will not be touched during transportation. Bad, see Figure 1. The use of a tool sill has the following advantages: (1) omission of a precast concrete sill; (2) no need to cut precast concrete sill after installation; (3) material and post-processing costs. This concrete prefabricated component reserving door tool tool sill is composed of a trough-shaped frame welded by steel plates, basket bolts, and two screw rods each having an upset and a snap ring. There are two transverse ribs with through holes in the steel plate trough frame to enhance the rigidity of the trough frame and ensure the position of the snap ring bolts. End seals with both ends of the frame in contact with the door opening