Concrete Cutting Sawing Norwell MA Mass Massachusetts

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Two capacities of resistance can be furnished: (a) Intermittent service, zero to full load; and (b) Intermittent service, zero to half- speed; and continuous service, half-speed to full speed. The controllers are of the drum type, similar to those used on streetcars. In constructing large reinforced-concrete buildings, usually a separate hoist is used to hoist the steel and lumber for the concrete forms. This hoist may be equipped with either an electric motor or an engine, depending upon the general arrangement of the plant. These hoists are usually of the single-drum type. In building construction, concrete is usually hoisted in automatic dumping buckets. The bucket is designed to slide up and down a light framework of timber, as shown in Fig. 138, and to dump automatically when it reaches the proper place to dump. The dumping of the buckets is accomplished by the bucket pitching forward at the point where the front guide in the hoisting tower' is cut off. The bucket rights itself again automatically as soon as it begins to descend.

These buckets are often used for hoisting sand and stone as well as concrete. The capacity of these buckets varies from 10 cubic feet to 40 cubic feet. Fig. 139 shows a guide bucket which has been satisfactorily used for this purpose. The concrete mixers Plan are usually charged by means of wheel with Automatic Dumping barrows, although other means are sometimes used. Fig. 140 shows the type of wheelbarrow generally used for this work. The capacity varies from 2 cubic feet to 4 cubic feet, the latter size being generally used, as with good runways, a man can handle four cubic feet of stone or sand in a well-constructed wheelbarrow. In ordinary massive concrete construction, as foundations, piers, etc, where it is not necessary to hoist the concrete after it is mixed, the concrete mixer is usually elevated so that the concrete can be discharged directly into wheelbarrows, carts, cars, or a chute from which the wheelbarrows or carts are filled.

It is much better to discharge the concrete into a receiving chute than to discharge it directly into the conveyor. The chute can be emptied while the concrete mixer is being charged and rotated; while, if the concrete is discharged directly into wheelbarrows or carts, there must be sufficient wheelbarrows or carts waiting to receive the discharge or the man charging the concrete mixer will be idle while the concrete mixer is being discharged. A greater objection is that if the man in charge of the concrete mixer finds that the charging men or conveying when are waiting, he is very apt to discharge the concrete before it is thoroughly mixed, in an effort to keep all the men busy. A platform is built at the elevation of the top of the hopper, through which the materials are fed to the concrete mixer, Fig. 141. This is a rather expensive operation for mixing concrete, and should always be avoided when possible. Fig. 142 shows a charging elevator devised by the McKelvey Machinery Company. The bucket is raised and lowered by the same engine by which the concrete is mixed, and operated by the same man.

The capacity of the charging bucket is the same as that of the concrete mixer. In Fig. 143 is shown an automatic loading bucket which has been devised by the Koehring Machine Company for charging the concrete mixers made by them. The bucket is operated by a friction clutch, and is provided with an automatic stop. In using either make of these charging buckets, it is necessary to use wheelbarrows to charge the buckets, unless the materials are close to the concrete mixer. Concrete is usually transported by wheelbarrows, carts, cars, or derricks, although other means are frequently used. It is essential, in handling or transporting concrete, that care be taken to prevent the separation of the stone from the concrete mortar. With a wet mixture, there is not so much danger of the stone separating.

Are You in Norwell Massachusetts? Do You Need Concrete Cutting?

We Are Your Local Concrete Cutter

Call 781-519-2456

We Service Norwell MA and all surrounding Cities & Towns