that water will drain off without standing; and that the layers be adequately supported so that the lower layers will not be crushed by the weight of the material above them. Preferably, the high end of the stack should be cantilevered forward at the top to provide an cave effect. Kiln-dried timber, finish lumber, and millwork must be stored under cover.
The inspector must allow latitude on the type and arrangement of plant and equipment to be used on the job, but you must make sure that the plant is adequate for the work, is arranged to minimize interference with others or with station operations, and is safe. The scope of the plant will depend both on the magnitude of the work and on the extent of manufacture and prefabrication before erection.
When a large volume of rework is involved, all cutting, matching, and shaping, and as much prefabrication as possible will generally be done at a central woodworking plant at the site before erection. This procedure assures more accurate work at considerable saving in labor and is to be encouraged as tending to assure a better job. The inspector should give special attention to checking first runs of each production run to make sure that each piece is cut and shaped to correct dimensions and pattern. When required by the project specifications, the inspector must check to see that all fabrication is accomplished before treatment.
Prefabrication or preassembly may be practical on a larger scale if the character of the work permits. The inspector should check all jigs and fixtures used in such processes to make sure that the units are true to exact dimensions within permissible tolerances and that the units are complete in all respects with attachments, holes for field bolts, and grooves for ring connectors, as required. The inspector must also make sure that handling devices for the completed units are adequate to assure their conveyance without distortion or damage. If the material is treated, he or she must make sure that all cuts and holes are given the surface treatment specified.
The erection plant will usually consist of automotive or locomotive cranes or travelers with the necessary slings, strongbacks, and lifting devices. The inspector must ensure that the equipment has satisfied all the weight-handling requirements, is safe to operate, and is in good working order.
The inspector must make sure that the erection methods used are safe, allow the work to be done effectively, and are in keeping with the workmanship and quality of the Seabees. The inspector must then ensure the following:
That all members are of the correct dimensions and are cut square or formed to exact shape and that they are fitted together truly with full bearing and without shims or other adjusting devices, except as specifically permitted.
That bolt holes are round and undersized for drive fit.
That all members are aligned correctly.
That the work is adequately braced, guyed, or supported at all times to assure against distortion or collapse.
That all bolts, driftpins, ring connectors, and other hardware are of the specified dimensions and materials, and galvanized if required, and are properly installed and tightened or driven to proper depth without damaging the timber.
The inspector must reject and require replacement of any timber or hardware damaged during erection. The inspector should make sure that temporary holding or aligning devices are provided and used as necessary to assure tight, accurate work, that these devices do not injure or mar the finished work, and that they are removed upon completion of erection. On work involving the connection of a number of plies of heavy material, it is essential that ample length of tread bolts is available if the timber shrinks. The inspector must make sure that all other detailed requirements of the specifications are fully met.Continue Reading