Abstract: Relates to a combination carpenter's portable power operated hand saw and table saw in which the hand carrying case forming the table of the combination approximates in size that of travel suitcases and similar forms of luggage. The case is provided interiorly with guides for receiving and removably suspending a power driven hand saw in inverted or upside down relationship to the normal usage of the portable saw such that the blade of the saw is projectionable through a slot in the top of the case for cutting purposes. Means is provided inside the case for withdrawing the blade from the slot through which it projects when not in use and for tilting the blade to selection positions for making inclined cuts. Means is provided externally of the case for guiding the work product being cut, the guiding member for this purpose being slidably movable varying distances from the plane of the blade. Means is also provided for knock down packaging of the parts of the case for shipping purposes.

Abstract: There is disclosed a liquid accelerating additive for wet concrete which has a long shelf stability and which is ideally suited for use in shotcreting applications. The accelerating additive is a composition of sodium and potassium aluminates having the proportions of from 15 to about 40 weight percent alumina, and from 10 to about 25 weight percent of each of sodium and potassium, expressed as the oxides. The balance of the additive is water.The invention also includes a method of shotcreting in which wet concrete is sprayed against the surface of a structure, typically the wall and/or ceiling of a subterranean tunnel or cavern while incorporating in the wet concrete mixture a sufficient quantity of the liquid accelerating additive to control the setting of the concrete coating.