陜西寶坪高速公路控制性工程秦嶺天臺(tái)山隧道全長(zhǎng)15.56公里，雙向六車道設(shè)計(jì)，建設(shè)規(guī)模目前居世界第一。中交二公局承擔(dān)天臺(tái)山隧道主洞3180米及1號(hào)斜井施工任務(wù)。斜井縱坡達(dá)到-40.175%，隧道施工采用有軌運(yùn)輸系統(tǒng)、水壓聚能爆破等先進(jìn)工藝，標(biāo)準(zhǔn)化施工被樹為陜西省樣板。
　　Shaanxi Baoji-Pingkan Expressway Controlling Project-Qinling Mt. Tiantai Tunnel is 15.56 km long, with two-way six-lane design; and its construction scale ranks first place in the world at present. CCCC Second Highway Engineering Co., Ltd. is responsible to construct 3180m long of the main tunnel and No.1 inclined shaft construction work of Mt. Tiantai Tunnel. The longitudinal slope of inclined shaft reaches-40.175%. The tunnel construction adopts advanced technology such as rail transportation system and water pressure accumulative energy blasting. The standardized construction is a model of Shaanxi province.