Concrete Cutting Cutter Chelsea MA Mass Massachusetts

Chelsea

Concrete Cutting Cutter Chelsea MA Mass Massachusetts

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Chelsea Massachusetts Concrete Cutting and Core Drilling

A simple method of firmly anchoring the concrete wall to the footing is to set one man rocks into the footing, permitting them to project above the footing line; then, when the walls are poured, the concrete will envelop the upper half of the rocks and make a definite key and bond with the footing. Another method is indicated in the sketch. A two by four slightly beveled is set into the footing concrete and later withdrawn, providing a substantial keyway, which is filled with the pouring of the wall concrete, thus making a tight joint and strong bond between the concrete wall and footing. In the construction of forms for concrete the primary considerations are water tightness, rigidity, strength, and salvage value. Experience has proved spruce to be a most acceptable and satisfactory lumber for this sort of work. For very careful work, such as ornamental concrete and other small forms, white pine is recommended. Norway and Southern pine also may be used with good success. Hemlock, which is so readily available everywhere, does not prove satisfactory, as it splits very easily and has a tendency to curl. On all form work it is advisable to provide sheathing surfaced one side and one edge at least, as it is much easier and faster to work with and presents a much smoother and tighter surface to the concrete. Shiplap, or tongue and grooved lumber, is highly desirable in making the form watertight and in rigidly maintaining correct alignment. Studs should be set opposite to each other to facilitate the wiring of the form and must be spaced close enough to prohibit any bulging or weaving in the form line. It is seldom advisable to space studding more than 18 inches apart when using 1 inch sheathing.

Spreaders cut the exact width of the wall are used in spacing the two forms, and wire (usually No. 9) is run through the walls and about the studs; these are twisted until tight, which brings the entire form into position. It is impossible to set any hard and fast rule for the spacing of the wire ties, but it is seldom advisable to spread them further apart than three feet in either direction. Nails should be used sparingly, and should not be driven completely, for by leaving them out a bit they may be easily pulled when dismantling and salvaging the form lumber. Crude oil applied to the face of the forms greatly facilitates their removal and serves to preserve the lumber. Oil must not be used, however, on the forms of walls which will later be plastered, as it will make impossible a satisfactory and permanent bond. In all cases where oil is not used the forms should be well soaked with water just prior to placing the concrete. Immediately after their removal forms should be scraped free of all concrete, for while it is comparatively green this is not a difficult matter, and by so doing the lumber is made available for other work.

Forms that are built in sections for standard work should be very strongly built of well-seasoned lumber, preferably tongued and grooved. The nails should be securely driven home and holes should be bored big enough to permit pulling the tie wires through without mutilating the lumber. In butting sections together it is well to use bolts and washers, this method will insure correct alignment and eliminate unsightly offsets in the finished work. The forms should be serviceable for a great many jobs, if ordinary care is used in handling and storing them. After the work has been completed the forms should be carefully removed, thoroughly cleaned and repaired, after which they should be oiled and stored under cover, if possible. Steel forms, which are used a great deal for concrete work, can be purchased ready to use equipped with pins and braces for their erection. These are very durable and will last indefinitely if properly cared for.

They should be cleaned and oiled after each installation and when being stored. They should be sheltered from the weather to prevent rust. The table on next page will be found useful in computing the board feet required in material for forms.