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原文传递 FIRST PRECAST CONCRETE BOX CULVERTS IN MINNESOTA.

题名：	FIRST PRECAST CONCRETE BOX CULVERTS IN MINNESOTA.
作者：	Hill-JJ; Laumann-FJ
关键词：	PRECAST-CONCRETE; BOX-CULVERTS; MINNESOTA-; BURIAL-DEPTH; THICKNESS-DESIGN; CONSTRUCTION-TIME; QUALITY-CONTROL; PERFORMANCE-
摘要：	The first known precast concrete box culverts were installed in Minnesota in 1974 on T.H. 60 with up to 9.75 m (32 ft) of overfill. The twin precast barrel sections were placed at the same elevation, and 1 m (3 ft) apart. The heaviest sections had 280-mm (11-in.) top and bottom slabs and 250-mm (10-in.) thick sidewalls. The 82-m (268-ft)-long box culverts plus precast apron sections were placed in less than 4 days. Actual construction time for this project was 4 weeks. The advantages of precast concrete box culverts over cast-in-place concrete culverts are shorter construction time and better quality control. The time savings is desirable because of the short seasonal construction time in Minnesota and heavy traffic usage. After 20 years these box culvert structures do not show any structural distress.
总页数：	Transportation Research Record. 1995. (1514) pp22-28 (5 Phot., 8 Fig., 2 Tab.)
报告类型：	科技报告