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We provide core drilling and coring to Candia NH.

This may be done by driving a large number of concrete piles into the soil, especially if the concrete piles will be always under the water line in that ground. Driving the concrete piles compresses the soil; and if the concrete piles are always under water, they will be free from decay. If the soil is sufficiently firm so that the pile can be withdrawn and the hole will retain its concrete forms even temporarily, it is better to draw the pile and then immediately fill the hole with sand, which is rammed into the hole as compactly as possible. This gives us a type of piling known as sand concrete piles. Soft, clayey subsoil may frequently be improved by covering it with gravel, which is rammed and pressed into the clay. Such a device is not very effective, but it may sometimes be sufficiently effective for its purpose. Subsoil is often very soft because it is saturated with water which cannot readily escape. Frequently a system of deep drainage which will reduce the natural level of the ground-water considerably below the desired depth of the bottom of the foundation, will transform the subsoil into a dry, firm soil which is amply strong for its purpose. Even when the subsoil is very soft, it will sustain a heavy load, provided that it can be confined. While excavating for the foundations of the tower of Trinity Church in New York City, a large pocket of quicksand was discovered directly under the proposed tower. Owing to the volume of the quicksand, it was found to be impracticable to drain it all out; but it was also discovered that the quicksand was confined within a pocket of firm soil. A thick layer of concrete was then laid across the top, which effectively sealed up the pocket of quicksand, and the result has been perfectly satisfactory. The preparation of a rock bed on which a foundation is to be placed is a simple matter compared with that required for some soils on which foundations are placed. The bed-rock is prepared by cutting away the loose and decayed portions of the rock and making the plane on which the foundation is placed perpendicular to the direction of the pressure. If the rock bed is an inclined plane, a series of steps can he made for the support of the foundation. Any fissures in the rock should he filled with concrete. Whenever it is necessary to start the foundation of a structure at different levels, great care is required to prevent a break in the joints at the stepping places. The precautions to be taken are that the concrete-joints must be kept as thin as possible; the lower part of the foundations should be laid in cement concrete; and the work should proceed slowly. By following these precautions, the settlement in the lower part will be reduced to a minimum. •These precautions apply to foundations of all classes. Under this heading is included hard clay, gravel, and clean, dry sand. The bed is prepared by digging a trench deep enough so that the bottom of the foundation is below the frost line, which is usually 3 to 6 feet below the surface. Some provision, similar to that shown in Fig. 35, should he made for drainage. Care should be taken to proportion the load per unit of area so that the settlement of the foundation will be uniform.

It is necessary to use a hand or steam pump to free the excavation of water. Quicksand and very soft mud are often pumped out along with the water by a centrifugal or mud pump. Sometimes areas are excavated by draining the water into a hole the bottom of which is always kept lower than the general level of bottom of the excavation. A pump may be used to dispose of the water drained into the hole or holes.

Are You in Candia New Hampshire? Do You Need Concrete Cutting?

We Are Your Local Concrete Cutter

Call 603-622-4441

We Service Candia NH and all surrounding Cities & Towns