 | Wells Construction: Hand Dug and Hand Drilled (Peace Corps, 1980, 282 p.) |
 |  | (introduction...) |
| | Acknowledgments |
| | Introduction |
|  | Section one: Planning |
| | Chapter 1: Introduction to wells planning |
| | A. Overview |
| | B. The need for adequate water supply |
| | C. Involving the local community |
| | D. Selecting the most appropriate water source |
| | E. Site choice |
| | F. Preventing water contamination |
| | G. Types of wells |
| | H. Well sections |
| | I. Materials |
| | J. Tools and equipment |
| | K. Sinking method |
| | L. Preparation for construction |
| | M. Planning |
| | Section two: Hand dug wells |
| | Chapter 2: Introduction to hand-dug wells |
| | Chapter 3: Well design |
| | Chapter 4: Supplies |
| | Chapter 5: Lowering and raising workers and equipment |
| | Chapter 6: Digging |
| | Chapter 7: The middle section: overview of lining techniques |
| | Chapter 8: Construction of the middle section |
| | Chapter 9: Construction of the bottom section |
| | Section three: Drilled wells |
| | Chapter 10: Introduction to drilled wells |
| | Chapter 11: Drilling and casing techniques |
| | Chapter 12: Construction: hand rotary and hand percussion methods |
| | Chapter 13: Construction: sludger method |
| | Chapter 14: Construction: driven and jetted |
| | Chapter 15: The bottom section |
| | Appendices |
| | Appendix I: Conversion factors and tables |
| | Appendix II: Vegetation as an index of ground water |
| | Appendix III: Uses of dynamite in hand dug wells |
| | Appendix IV: Cement |
| | Appendix V: Leveling and plumbing the mold |
| | Appendix VI: Pipe |
| | Appendix VII: Pumps |
| | Appendix VIII: Water treatment in wells |
| | Appendix IX: Rope strength |
| | Glossary |
| | Annotated bibliography |
Appendix IX: Rope strength
Rope strength
This chart is based on a similar chart found in Engineer Field Data (1969) FM5-34, Headquarters Department of the Army, 554 pp. The original chart was given in English units which have here been converted to metric units.
The safe loads listed are for new rope used under favorable conditions. These have been calculated by dividing the breaking strength of the rope by 4. As rope ages or deteriorates, progressively reduce safe loads to one-half of the values given.
Here is an example of how the chart can be used.
A 1 meter high lining ring 10 cm thick with a 1.2 m interior diameter contains 0.41 m³ of concrete. Since concrete normally weighs about 2300 kg. per m³ the lining ring weighs about 943 kg. or 0.943 tons. A new manila rope with a diameter of at least 2.54 cm and a circumference of 7.98 cm will be needed to safely handle the lining ring.
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