| 摘要 |
A climbing form for progressively raising a form assembly in the construction of a concrete wall comprises has a support frame that adjustably carries a mast form unit, a main mast assembled with the frame for relative up and down movement, and a jib mast, equipped with a lifting means, extended upwardly from the main mast. A carriage within the main mast is releasably locked to the frame when the main mast is moved relative to the frame, and is releasable for up and down movement within the upper section of the main mast to raise and lower a jib form unit. A reversible nut and shaft drive means has the shaft rotatably supported in the mast upper section with the nut mounted on the carriage. With the lower section of the mast secured to the wall, and the frame and carriage in locked engagement, the drive means operates to raise the frame and carriage relative to the main mast to a new pouring position for the mast form unit. The carriage is then released from the frame and the drive means is again operated to raise and lower the carriage within the upper mast section to actuate a lift means to move the jib form unit into position with the mast form unit for a new pour. When the new pour has set the carriage is moved again by the drive means into a locking position with the frame after which the lower mast section is released from the wall and raised by the drive means to a new secured position on the wall. The cycle of setting the form assembly for a new pour is then repeated.
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