【Production Version】Daily Question 20180115
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When trenching is used for the construction of water supply and drainage pipelines, the cross-section of the trench can take the form of a straight trench, a trapezoidal trench, or a mixed type of trench. Which of the following statements is correct? ( ) A. During the construction of combined trenches, attention must be paid to ensuring mechanical safety.B. In cases of poor geological conditions during the excavation of mixed trenches, a specialized safety and technical plan should be developed, along with practical safety measures.
C. Ditches for retaining water and draining water should be constructed on the outside of the trenches to prevent rainwater from soaking them, and the source of fill soil should also be protected.
D. The support system for the trenches should be designed taking into account factors such as the soil quality, groundwater level, cross-sectional dimensions of the trench, and load conditions ； The construction party shall provide support in accordance with the design requirements. E. The height of the soil pile formed during trench excavation should not exceed 2.5 m, and it should be at least 1.0 m away from the edge of the trench. Correct answers: ABCD
When constructing water supply and drainage pipelines by trenching, the cross-section of the trench can take the form of a straight trench, a trapezoidal trench, or a mixed type of trench. The correct options among the following are ( ABC'D ). A. During the construction of combined trenches, attention must be paid to ensuring mechanical safety.
B. In cases of poor geological conditions during the excavation of mixed trenches, a specialized safety and technical plan should be developed, along with practical safety measures.
C. Ditches for retaining water and draining water should be constructed on the outside of the trenches to prevent rainwater from soaking them, and the source of fill soil should also be protected.
D. The support system for the trenches should be designed taking into account factors such as the soil quality, groundwater level, cross-sectional dimensions of the trench, and load conditions ； The construction party shall provide support in accordance with the design requirements. E. The height of the soil pile formed during trench excavation should not exceed 2.5 m, and it should be at least 1.0 m away from the edge of the trench
B. In cases of poor geological conditions during the excavation of mixed trenches, a specialized safety and technical plan should be developed, along with practical safety measures.
C. Ditches for retaining water and draining water should be constructed on the outside of the trenches to prevent rainwater from soaking them, and the source of fill soil should also be protected.
D. The support system for the trenches should be designed taking into account factors such as the soil quality, groundwater level, cross-sectional dimensions of the trench, and load conditions ； The construction party shall provide support in accordance with the design requirements. E. The height of the soil pile formed during trench excavation should not exceed 2.5 m, and it should be at least 1.0 m away from the edge of the trench
When trenching is used for the construction of water supply and drainage pipelines, the cross-section of the trench can take the form of a straight trench, a trapezoidal trench, or a mixed trench; the correct options among the following are (ABCD). A. During the construction of combined trenches, attention must be paid to ensuring mechanical safety.
B. In cases of poor geological conditions during the excavation of mixed trenches, a specialized safety and technical plan should be developed, along with practical safety measures.
C. Ditches for retaining water and draining water should be constructed on the outside of the trenches to prevent rainwater from soaking them, and the source of fill soil should also be protected.
D. The support system for the trenches should be designed taking into account factors such as the soil quality, groundwater level, cross-sectional dimensions of the trench, and load conditions ； The construction party shall provide support in accordance with the design requirements. E. The height of the soil pile formed during trench excavation should not exceed 2.5 m, and it should be at least 1.0 m away from the edge of the trench
B. In cases of poor geological conditions during the excavation of mixed trenches, a specialized safety and technical plan should be developed, along with practical safety measures.
C. Ditches for retaining water and draining water should be constructed on the outside of the trenches to prevent rainwater from soaking them, and the source of fill soil should also be protected.
D. The support system for the trenches should be designed taking into account factors such as the soil quality, groundwater level, cross-sectional dimensions of the trench, and load conditions ； The construction party shall provide support in accordance with the design requirements. E. The height of the soil pile formed during trench excavation should not exceed 2.5 m, and it should be at least 1.0 m away from the edge of the trench
A. Attention should be paid to mechanical safety during groove joining construction