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. .. . .. 學(xué)習(xí)參考 目錄 一、編制依據(jù)····················································3 二、工程概況····················································3 1、項(xiàng)目概況··················································3 2、地質(zhì)地貌概況··············································4 3、設(shè)計(jì)概況 ·················································4 4、施工特點(diǎn)··················································4 三、施工安排···················
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土方開挖放坡系數(shù) 根據(jù)目前用的《建筑工程消耗量標(biāo)準(zhǔn)》在第一章:土 方工程:溝槽開挖放坡系數(shù) 土壤類別 放坡起點(diǎn)( m)人工挖土 機(jī)械挖土 在坑上作業(yè) 在坑內(nèi)作業(yè) 一、二類土 1.2 0 1 :0. 5 1 :0. 3 3 1 : 0.7 5 三類土 1. 5 0 1 : 0.3 3 1 : 0.2 5 1 : 0.6 7 四類土 2. 0 0 1: 0.2 5 1: 0. 1 0 1: 0. 3 3 破度系數(shù):指坡面水平方向的投影長(zhǎng)度與它在垂直 方向的投影長(zhǎng)度的比值,與坡度互為倒數(shù)。 坡度系數(shù)用 K 表示,即 K= b / a 首先,土方邊坡坡度 = H / B(基坑高度 /放坡寬度) 然后,(定額中)放坡系數(shù) = 1 / ( B / H ) 所以, m = B / H 稱為坡度系數(shù) 根據(jù)土方工程定額,對(duì)計(jì)算挖溝槽土方放坡系數(shù)規(guī)定 如下: ( 1 )挖土深度在 lm 以內(nèi),不考慮放坡; (
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