本工(gong)程(cheng)为(wei)黄陵(ling)至延安高速??(su)公路扩(kuo)能工(gong)程(cheng)一局部，具备实验(yan)性子(zi)，其(qi)特色(se)为(wei)布局新奇多样、建造工(gong)艺(yi)庞(pang)杂。该(gai)工(gong)程(cheng)分(fen)K15、K16、K18三个分(fen)项工(gong)程(cheng)。??????????????????????????

K15工程全长96.96米(mi)。主(zhu)体?布局为(wei)(wei)矩形(xing)(xing)(xing)钢(gang)管(guan)混(hun)凝(ning)土(tu)组合(he)桁(heng)(heng)架(jia)持续(xu)刚(gang)构桥(qiao)，跨径安排为(wei)(wei)24+40+24米(mi)，主(zhu)墩(dun)接(jie)纳PBL加(jia)劲(jing)型钢(gang)管(guan)混(hun)凝(ning)土(tu)桥(qiao)墩(dun)，墩(dun)梁刚(gang)接(jie)。桥(qiao)台(tai)接(jie)纳桩借(jie)盖梁轻型桥(qiao)台(tai)。根本(ben)情势均为(wei)(wei)穿孔贯注(zhu)桩基根本(ben)。桥(qiao)面(mian)(mian)(mian)总宽0.5（护栏(lan)）+4.5（桥(qiao)面(mian)(mian)(mian)）+0.5（护栏(lan)）=5.5米(mi)，双向2%的(de)横坡。汽车超载(zai)负荷(he)等级(ji)达高速公路-II级(ji)。上部(bu)布局外面(mian)(mian)(mian)安排为(wei)(wei)三角形(xing)(xing)(xing)腹(fu)杆桁(heng)(heng)架(jia)体系(xi)，桁(heng)(heng)高2.5米(mi)，桁(heng)(heng)高与跨径之比(bi)为(wei)(wei)1/16。共22个(ge)节间，每节间长4m。截面(mian)(mian)(mian)情势为(wei)(wei)空(kong)间矩形(xing)(xing)(xing)。下部(bu)布局主(zhu)墩(dun)首要接(jie)纳双肢“Y”形(xing)(xing)(xing)PBL加(jia)劲(jing)型钢(gang)管(guan)混(hun)凝(ning)土(tu)桥(qiao)墩(dun)，墩(dun)梁刚(gang)接(jie)，钢(gang)管(guan)内贯注(zhu)混(hun)凝(ning)土(tu)。

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