This section is from the book "Cyclopedia Of Architecture, Carpentry, And Building", by James C. et al. Also available from Amazon: Cyclopedia Of Architecture, Carpentry And Building.
A self-propelling mixing and spreading machine has been found very desirable for laying concrete base for street pavements. Fig. 148 illustrates a plant of this kind, which has been devised by the Municipal Engineering & Contracting Company. One of these machines was very successfully used in Buffalo, N. Y., in 1907.
The mixer is of the improved cube type, mounted on a heavy truck frame. The concrete is discharged into a specially designed bucket, which receives the whole batch and travels to the rear on a truck which is about 25 feet long. The head of the truck is supported by guys, and also by a pair of small wheels near the middle of the truck, which rest on the graded surface of the street. The truck or boom is pivoted at the end connected to the main truck, and has a horizontal swing of about 170 degrees, so that a street 50 feet wide is covered. An inclined track is also constructed, on which a bucket is operated for elevating and charging the mixer. The bucket is loaded while resting on the ground, with the proper ingredients for a batch, from the materials that have been distributed in piles along the street. The bucket is then pulled up the incline, and the contents dumped into the mixer. An automatic water-measuring supply tank mounted on the upper part of the frame insures a uniform amount of water for each batch mixed. The power for hoisting, mixing, and distributing the concrete, and propelling the machine, was furnished by a 16-horse-power gasoline engine of the automobile type. The machine can be moved backward as well as forward, and is supplied with complete steering gear.
HOTEL MARLBORODGH-BLENHEIM, ATLANTIC CITY, N. J.
This Magnificent Structure, Built Throughout of Reinforced Concrete is Especially Noteworthy as the Most Elaborate Application which has Yet been Made of this New Material of Construction. It is Located Near the Famous " Boardwalk," Overlooking the Ocean.
Fig. 148. "Standard" Street Concrete Machine. Municipal Engineering & Contracting Company, Chicago, 111.
The capacity per charge of the mixer and charging and distributing buckets used at Buffalo, was 11 cubic feet. The crew consisted of 16 men and a foreman, and they mixed and laid from 110 to 120 cubic yards per hour. Their best record was 1,000 cubic yards in an eight-hour day. The thickness of the concrete base laid was 6 inches.