Video: Lub kaum sab xis yuav tsum sloping trench phab ntsa hauv hom B av txoj kab nqes yuav?
2024 Tus sau: Stanley Ellington | [email protected]. Kawg hloov kho: 2023-12-16 00:17
Cov txoj kab nqes rau a Hom B excavation yog 1: 1 piv los yog 45-degree lub kaum sab xis . Rau txhua ko taw ntawm qhov tob, ob sab ntawm excavation yuav tsum nqes hav qab 1ft. Hom B av yog cohesive nrog unconfined compressive zog ntau dua 0.5 tsf, tab sis tsawg tshaj li 1.5 tsf.
Yog li ntawd, qhov siab tshaj plaws txoj kab nqes rau hom B av yog dab tsi?
Yuav tsum muaj
| Av lossis Pob Zeb Hom | Max Qhov siab (H: V) | Max nqes hav (degrees) |
|---|---|---|
| Stable Pob Zeb | Ntsug | 90 |
| Chav kawm "A" | 3/4: 1 | 53 |
| Chav kawm "B" | 1: 1 | 45 |
| Chav kawm "C" | 3/2: 1 | 34 |
Ib yam li ntawd, hom C av puas tuaj yeem nqes? OSHA xav tau hom C av ua nqes hav ntawm 1½H: 1V thiab nws tsis tuaj yeem raug tshem tawm. Qhov no txhais tau tias nqes hav yuav tsum tau txiav rov qab 1½ ft kab rov tav rau txhua 1 ft ntawm qhov tob.
Ntxiv mus, dab tsi lub kaum sab xis yuav tsum tau txiav rov qab rau?
Rau hom 1 thiab 2 av, txiav trench phab ntsa rov qab at ib lub kaum sab xis ntawm 1 txog 1 (45 degrees). Qhov ntawd yog ib 'meter' rov qab rau txhua 'meter' nce. Phab ntsa yuav tsum yuav tsum tau nqes mus rau hauv 1.2 meters (4 feet) ntawm lub trench hauv qab (Daim duab 8).
Tus qauv sloping rau hom A av yog dab tsi?
Rau HOM A av thiab trench qhov tob ntawm tsawg dua 12 ko taw rau lub trench qhib 24 teev los yog tsawg dua, qhov siab tshaj plaws tso cai nqes hav yog 63 degrees ntawm kab rov tav. Qhov no txhais mus rau 0.5H: 1V incline thiab qhia hauv qab no.
Pom zoo:
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Kub ntawm 35.5 degrees