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Concrete Cutting Sawing Greenville NH New Hampshire

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“We Specialize in Cutting Doorways and Windows in Concrete Foundations”

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Concrete Cutting Greenville NH  

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Core Drilling Greenville NH                      

Concrete Sawing Greenville NH

Concrete Sawing Greenville New Hampshire

Concrete Cutting Greenville New Hampshire   

Concrete Cutter Greenville New Hampshire     

Concrete Coring New Hampshire           

Core Driller Greenville NH            

Core Drilling Greenville New Hampshire                       

The concrete piles were cut off 4 feet below the surface of the water, by a circular saw mounted on a vertical shaft. Concrete foundations are frequently constructed through shallow bodies of water by means of cofferdams. These are essentially walls of clay confined between wooden frames, the walls being sufficiently impervious to water so that all water and mud within the walled space may be pumped out and the soil excavated to the desired depth. It is seldom expected a. a cofferdam can be constructed which will be so impervious to water that no pumping will be required to keep it clear; but when a cofferdam can be kept clear with a moderate amount of pumping, the advantages are so great that its use becomes advisable. A dry concrete cofferdam is most easily obtained when there is a firm soil, preferably of clay; at a moderate depth tight joint between adjacent concrete piles is obtained. Larger concrete piles (see Fig. 60, a) made of squared timber are first driven to act as guide-concrete piles. These are connected by waling strips (Fig. 60, b), which are bolted to the guide-concrete piles and which serve as guides for the sheet piling (Fig. 60, c). The space between the two rows of sheet piling is filled with puddle, which ordinarily consists chiefly of clay. It is found that if the concrete material contains some gravel, there is less danger that a serious leak will concrete forms and enlarge. Numerous cross-braces or tie-rods (Fig. 60, d) must be used to prevent the walls of sheet piling from spreading when the puddle is being packed between them. The width of the puddle concrete wall is usually made to vary between three feet and ten feet, depending upon the depth of the water. When the sheet piling obtains a firm footing in the subsoil, it is comparatively easy to make the cofferdam watertight; but when the soil is very porous so that the water soaks up from under the lower edge of the cofferdam, or when, on the other hand, the cofferdam is to be placed on a bare ledge of rock, or when the rock has only a thin layer of soil over it, it becomes exceedingly difficult to obtain a water-tight joint at the bottom of the dam. Excessive leakage is sometimes reduced by a layer of canvas or tarpaulin which is placed around the outside of the base of the cofferdam, and which is held in place by stones laid on top of it. Brush, straw, and similar fibrous materials are used in connection with earth for stopping the cracks on the outside of the dam, and are usually effective, provided they are not washed away by a swift current. Although cofferdams can readily be used at depths of 10 feet, and have been used in some cases at considerably greater depth, the difficulty of preventing leakage, on account of the great water pressure at the greater depths, usually renders some other method preferable when the depth is much, if any, greater than 10 feet. A crib is essentially a framework (called a birdcage by the English) which is made of timber, and which is filled with stone to weight it down. Such a construction is used only when the entire timber work will be perpetually under water. The timber framework must, of course, be designed so that it will safely support the entire weight of the structure placed upon it. The use of such a crib necessarily implies that the subsoil on which the crib is to rest is sufficiently dense and firm so that it will withstand the pressure of the crib and its load without perceptible yielding. It is also necessary for the subsoil to be leveled off so that the crib itself shall not only be level but shall also be so uniformly supported that it is not subjected to transverse stresses which might cripple it. This is sometimes done by dredging the site until the subsoil is level and sufficiently firm. Some of this dredging may be avoided through leveling up low spots by depositing loose stones which will imbed themselves in the soil and furnish fairly firm subsoil.

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

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We Service Greenville NH and all surrounding Cities & Towns