| 種別 | Paper |
| 主題 | PRESTRESSING METHOD BY RELEASING COMPRESSION WITH POLYMER IMPREGNATED CONCRETE FROM AND COMPOSITE PIPE |
| 副題 | |
| 筆頭著者 | Masayoshi EBARA |
| 連名者1 | Koichi KOGA |
| 連名者2 | Yoshiharu KONDO |
| 連名者3 | Ken TURUTA |
| 連名者4 | |
| 連名者5 | |
| キーワード | |
| 巻 | 10 |
| 号 | 3 |
| 先頭ページ | 757 |
| 末尾ページ | 762 |
| 年度 | 1988 |
| 要旨 | 1. INTRODUCTION The utilization of the post-compressed reinforcement in the prestressed concrete was invented by Dr.H.Reiffenstuhl and was applied to the construction of the ALM bridge in Austria. In Poland Dr.S.Drewnowski tested many beams with post-compressed reinforcement and presented the new type of anchorage system. In Japan, this construction method is called Bi-Prestressing System and some bridges were built by this method recently. (1) On the other hand, the polymer impregnated concrete permanent forms were used for increasing the durability of the beams in the severe environment. With this PIC form, not only the durability, but also the cracking moment of the beam increases 20-30 % compared with the ordinary beam. (2) It is necessary to ensure the high fracture moment and ductility for the safty of the beam. Pre-compressed composite reinforcements were placed on the upper side of the beam for this purpose. The idea to use the composite pipe for pre-compressed reinforcement was patented by Gihachi Nakalima and was use for changing the compresion to tention after the hardening of concrete. (3) This paper deals with the whole effect of prestressing method by releasing compresion (PMRC) together with PIC permanent forms and compressed composite pipes. 5. CONCLUSION The PMRC with PIC permanent forms and composite pipes has following advantages: a. The cracking moment higher than that of the same sectioned PC beam can be obtained and the ratio of the span by depth of the beam will be 30-35. b. The ductility of the beam are increased by composite pipes which is used for the pre-compressed reinforcement. c. The amount of the creep of the beam will be decreased by PIC permanent forms and by releasing prestress forces. d. The durability of the beam is ensured by the low permeability of PIC form. e. The PC tendons for prestressing composite pipes can be used repeatedly. |
| PDFファイル名 | 010-01-2134.pdf |