Xingfen expressway Winter construction scheme
The 12th contract section of Xingtai Jijin (provincial boundary) Expressway is located in Luluo Town, Xingtai City, Hebei Province, with a starting and ending mileage of K62+270 - K64+193 ZK62+270—ZK64+785.5, The total length of the left and right sides is 4.4685 km. The center mileage of the left line of Niudoutai Bridge is ZK62+466, with a span of 7 × 40m, 42 40m T-beams, and a bridge length of 288.2m; The center mileage of the right line is YK62+468, with a span of 8 × 40m, 48 40m T beams, 328.2m long, and 90 40m T beams in total. The upper structure adopts 7 × 40m and 8 × 40m fabricated prestressed simply supported and then continuous T-beam respectively, and the lower structure adopts column pier, hollow thin-walled pier, column abutment and pile foundation. There are 6 thin-walled piers, 14 other piers and 4 abutments of Niudoutai Bridge; The 2 #, 3 #, 4 # and 5 # piers of the left line are hollow thin-walled piers, and the pier heights are respectively: 34 meters high for 2 # pier, 35 meters high for 3 # pier, 37 meters high for 4 # pier, and 30 meters high for 5 # pier; Piers 5 # and 6 # on the right track are hollow thin-walled piers, with pier heights of 36 meters for 5 # pier and 39.5 meters for 6 # pier; The main pier shaft is a rectangular hollow pier with variable section, the outer section is 7.5m × 3.0m, the inner minimum section is 0.8m × 5.3m, the maximum section is 1.8m × 6.3m, the wall thickness is 0.6m, and the chamfer is 0.5m × 0.5m. The 1m height at the bottom of the pier shaft is a solid section, 3m upwards and 3m at the top are variable section sections. The center stake number of the left line of the skew girder bridge is ZK63+633. The upper part is 8 × 30 prefabricated prestressed concrete continuous T beam, and the lower part is column pier, pile foundation, U-shaped abutment and column abutment. There are 14 pier columns in total. The center stake number of the right line of the skew girder bridge is YK63+650, the upper part is 6 × 30 prefabricated prestressed concrete continuous T-beam, and the lower part is column pier, pile foundation, U-abutment, column abutment. 10 pier columns. Subgrade K62+260~K64+740, ZK62+240~ZK64+197; rear side beam tunnel ZK62+721~ZK63+377, K62+780~K63+425, subgrade filling, excavation and transportation according to the node schedule and current construction progress; Bridge pier; Winter construction shall be arranged for tunnel secondary lining and excavation support.