本工(gong)(gong)程为(wei)(wei)黄陵至延(yan)安高速(su)公路(lu)扩能工(gong)(gong)程一局(ju)部，具备实验(yan)性子，其特色为(wei)(wei)布局(ju)新奇多(duo)样(yang)、建(jian)造(zao)工(gong)(gong)艺庞杂。该?工(gong)(gong)程分K15、K16、K18三个分项工(gong)(gong)程。

K15工程全(quan)长96.96米(mi)(mi)。主体布局(ju?)为(wei)(wei)矩(ju)形(xing)钢管(guan)(guan)(guan)混(hun)凝(ning)土组合桁架(jia)持(chi)续刚构桥，跨径(jing)安(an)排为(wei)(wei)24+40+24米(mi)(mi)，主墩(dun)接(jie)纳(na)PBL加(jia)劲(jing)型(xing)(xing)钢管(guan)(guan)(guan)混(hun)凝(ning)土桥墩(dun)，墩(dun)梁(liang)刚接(jie)。桥台接(jie)纳(na)桩借盖(gai)梁(liang)轻(qing)型(xing)(xing)桥台。根本情(qing)势(shi)均为(wei)(wei)穿孔贯注桩基根本。桥面(mian)(mian)总宽0.5（护(hu)栏(lan)(lan)）+4.5（桥面(mian)(mian)）+0.5（护(hu)栏(lan)(lan)）=5.5米(mi)(mi)，双(shuang)向2%的横(heng)坡。汽(qi)车承(cheng)载(zai)力品阶达国道-II级。上部布局(ju)外面(mian)(mian)安(an)排为(wei)(wei)三角(jiao)形(xing)腹杆桁架(jia)体系，桁高2.5米(mi)(mi)，桁高与跨径(jing)之比为(wei)(wei)1/16。共22个节(jie)间(jian)，每节(jie)间(jian)长4m。截面(mian)(mian)情(qing)势(shi)为(wei)(wei)空间(jian)矩(ju)形(xing)。下部布局(ju)主墩(dun)首(shou)要接(jie)纳(na)双(shuang)肢“Y”形(xing)PBL加(jia)劲(jing)型(xing)(xing)钢管(guan)(guan)(guan)混(hun)凝(ning)土桥墩(dun)，墩(dun)梁(liang)刚接(jie)，钢管(guan)(guan)(guan)内(nei)贯注混(hun)凝(ning)土。

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