zielsicher Englisch, Bautechnik, Schulbuch

Look at the types of soil, translate them and put them into the right place. gravel marl boulders clay sand rock silt Natural soil is classified as follows: noncohesive soil cohesive soil Fels rock grober Schotter boulders Kies gravel Sand sand Schluff silt Lehm clay Mergel marl Read about excavation work dangers. Then, name actions to avoid excavation work dangers and write them into your exercise book. Water accumulation can be deadly. Water accumulates in excavation work from rain and groundwater and might weaken excavation walls. Water must be directed away by pumps. Damaged underground utilities can cause electric shocks or explosive atmospheres. Always enquire about gas or electric utilities, which have to be marked before digging. Excavation-work dangers Falling materials or objects can cause serious injuries. In Austria, material and tools must be kept at a minimum of 50cm away from the excavation work. Cave-ins happen when weak sidewalls fall into the excavation. Many accidents happen at a low depth and without a warning. Don’t forget to slope, bench or shore the excavation. Label the drawing. When excavating a trench, shoring is necessary, if … • a trench is deeper than 1.25 m; (or benching, if enough space is available); • an object (like a building or a road) is too close to the trench; • the soil is noncohesive (gravel); • the level of groundwater is too high; • only limited space is available for excavation work. Mosaic One of the most famous trenches on earth is the deepest part of the world’s oceans. It is located in the Pacific Ocean. Its depth is about 11,034 metres. It is the  Mariana Trench  . 03 A2 04 A2 Word bank 03 cohesive soil bindiger Boden 04 accumulation Ansammlung weaken schwächen damaged beschädigt explosive atmosphere explosive Umgebung dig graben injury Verletzung cave-in Einsturz depth Tiefe 05 A2 excavated material level of groundwater trench shoring water removal by a pump 91 Excavating the soil on site 21 Nur zu Prüfzwecken – Eigentum des Verlags öbv