| 摘要 |
A framing module for quickly assembling frames of rectangular towers suitable for supporting protective shields within excavations comprises a horizontal wale connected by hinge to a vertical leg and a locking brace to hold the hinged members in the right angle position. The wale has a tenon and set-back at each end. The hinged end of the leg is adjacent a set-back in the wale and that set-back becomes a mortise when the leg is set at right angle to the wale. The tenon of one module is inserted in the mortise of another module to interlock the modules. A rectangular frame is easily formed with at least four interlocked modules, and duplicate frames can be stacked to reach a desired tower height.
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