Parts That Are Easy To Handle

4-. Crane Reach

The detailer should alwavs be con-

j scious of the size and weight of building components, and of what will be required on the jobsite to handle them.

1. A standard brick takes its size, shape, and weight from the dimensions and capabilities of the human hand. A bricklayer works efficiently j ^

and comfortably by holding the trowel in one hand while lifting and placing bricks repeatedly with the other. If a substantially larger brick is specified, the bricklayer may fatigue more quickly, have muscular problems, and have difficulty in maintaining proper alignment of bricks in the wall. Many masons' unions have work rules concerning maximum weights of various kinds of bricks and blocks, and these must be taken into account.

2. Very small parts should be avoided, especially where the worksite might be dark, wet, or cold, making it difficult to see and handle the parts. Tweezcr-sizc parts should be avoided altogether. Finger-size parts, such as nails, screws, bolts, and nuts, are easy to handle in m warm to moderate temperatures and in adequate light. Hand-size components, such as wood shingles, bricks, and tiles, are ideal for the worker to handle. A concrete block, wood stud, clapboard, or plywood panel requires the use of both hands, which is acceptable but less desirable because it necessitates laying down tools to lift the component. Some components take two persons to handle: a jumbo concrete block, a full-thickness wall panel, a frame for a wall or partition, or a large sheet of glass. This is reasonable in most situations. Components that require three or more workers are awkward and waste time.

3. Hoists and cranes come in many j configurations, reaches, lifting capacities, and maneuverabilities. Components requiring the use of a crane should be avoided, unless there will be a crane on the site to lift many other components as well. Sometimes, of course, it is economical or unavoidable to rent a crane to hoist a single large component into place, but such situations should be studied carefully, j 9

because crane time is expensive.

4. Cranes and hoists must be selected and located on the site so that thev are able to lift the required components and to place them where they arc wanted. This is largely the business of the contractor, but the detailer should be sure that all details that require crane lifts lie within reach of likelv crane

locations. A typical problem is that of lifting materials over a lower portion of a building to reach a higher portion. Overhead power and telephone lines can also inhibit the work ol a crane.

5. Building components must be sized to fit available transportation modes. Highway widths and clearances govern the sizes and weights of trucks, which in turn determine the maximum sizes of most building components. Oversize loads can be trucked in some situations, with accompanying cost penalties for off-hour deliveries and special police details. Barges or railroad cars can be used to carry oversize j components to some waterfront and railside construction sites.

6. Building openings have a lot to do with sizes of components. In an ordinary house, a temporary opening must be left in the exterior wall of each floor to allow a deliver)' truck to hoist bundles of gypsum board to the interior of the building; this can be a large window or door opening, or it may be necessary to leave a portion of the wall unframed and unsheathed. A standard, one-piece, tub-and-shower unit can be used onlv if it is installed before

the interior framing is completed. Once the partitions are framed and the wallboard is on, the one-piece tub can no longer be brought in, and a three-piece unit must be used instead. Installation of some large-building equipment, such as boilers and fans, can require that wall cladding and partitions be omitted temporarily from certain areas. E>

7. Ease of handling includes consideration of the possibility that parts can be inadvertently installed back-

j ward or upside down. Wedge anchor inserts that are installed in formwork before concrete is poured are useless and impossible to replace if they are installed upside down. They should be manufactured with prominent "UP" indications, and the detailer should make a note to pass on to the construction supervisor to check the installation of these components very carefully before concrete is poured.

8. Reglet components are also susceptible to being inverted during installation.

9. Where possible, detail components either so that they are symmetrical and can be installed in either direction, or so that they are asymmetrical in a way that only permits them to be installed correctly. This curtain wall anchor tec cannot be installed upside down, because it is symmetrical: Either wav will j j work. If the vertical spacing between bolt holes is different from the horizontal spacing, it will also be impossible to err by installing it sideways. ■

7. Wedge Anchor Inserts

9. Anchor Tee

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