Elements of plumbing . Side o-F Trench Cross-Sec+ion (Plank laid figh-t) of Trench FiQ. 36.—Laying of plank for txenoh dug in sandy ground. Sandy Ground.^—^If the ground is sandy, the sides of thetrench will have to be sheathed or planked and the planksbraced so as to prevent the bank caving in. As the trenchis dug deeper, the planks are driven down. When thetrench is very deep, a second row of planking is planks must be kept well down to the bottom of thetrench and close together, otherwise the sand will run in. LAYING TERRA-COTTA 71 It is well to test the planking as progress i
Elements of plumbing . Side o-F Trench Cross-Sec+ion (Plank laid figh-t) of Trench FiQ. 36.—Laying of plank for txenoh dug in sandy ground. Sandy Ground.^—^If the ground is sandy, the sides of thetrench will have to be sheathed or planked and the planksbraced so as to prevent the bank caving in. As the trenchis dug deeper, the planks are driven down. When thetrench is very deep, a second row of planking is planks must be kept well down to the bottom of thetrench and close together, otherwise the sand will run in. LAYING TERRA-COTTA 71 It is well to test the planking as progress is made by tamp-ing the sand on the bank side of the planks. Gravel.—Where the ground is mostly gravel and wellpacked, the above method of planking is unnecessary. Thebank should have a few stringers and braces to support it-When only a few planks are used the term corduroy thebank is used (see Fig. 37)..
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