CN-121973431-A - Continuous closed stirrup bending device and bending method for fiber reinforced thermoplastic resin composite material rib

CN121973431ACN 121973431 ACN121973431 ACN 121973431ACN-121973431-A

Abstract

The invention provides a continuous closed stirrup bending device and a bending method for fiber reinforced thermoplastic resin composite material bars, and belongs to the field of stirrup bending devices. The device for rapidly bending the continuous closed stirrup of the fiber reinforced thermoplastic resin composite material solves the problems that the existing device for rapidly bending the continuous closed stirrup of the fiber reinforced thermoplastic resin composite material is lack in preparation and performance, and other stirrup bending devices have insufficient heating precision, low bending efficiency, limited product size, incapability of meeting rapid bending of the engineering site and the like. The invention discloses a U-shaped steel bar section straight plate and two bending section sector plates, which are alternately formed and fixed on a U-shaped steel bar section bottom plate, wherein a connecting section straight plate, two bending section sector plates and two straight steel bar section straight plates alternately form a U-shaped steel bar section, are fixed on a continuous section bottom plate, and are oppositely arranged. According to the invention, the continuous closed stirrup processing of the fiber reinforced thermoplastic resin composite material with different materials, diameters and bending radiuses can be adapted by changing the sizes of the bottom plate, the straight plate and the baffle plate, so that the applicability is wide.

Inventors

LI CHENGGAO
PENG ZHAN
LIU ZIYANG
ZHANG ZHUO
CHEN MEILIANG
XIAN GUIJUN
WANG ANJI
BAI YANBO
WANG JIANLING
TIAN LINGYU
ZHANG PUXUAN
PAN YUNFENG

Assignees

哈尔滨工业大学

Dates

Publication Date: 20260505
Application Date: 20260319

Claims (9)

1. A continuous closed stirrup bending device for fiber reinforced thermoplastic resin composite bars is characterized by comprising a continuous section base plate (1), a U-shaped bar section base plate (2), four bending section sector plates (3), five straight bar section straight plates (4), a connecting section straight plate (5) and a plurality of baffle plates, wherein the U-shaped is formed by the three straight bar section straight plates (4) and the two bending section sector plates (3) alternately, the U-shaped is formed by the connecting section straight plates (5), the two bending section sector plates (3) and the two straight bar section straight plates (4) alternately, the U-shaped is formed by the connecting section straight plates (5), the two bending section sector plates (3) and the two straight bar section straight plates alternately, and the two U-shaped are oppositely arranged on the continuous section base plate (1).
2. The continuous closed stirrup bending device for fiber reinforced thermoplastic resin composite bars according to claim 1, wherein the bending section sector plate (3), the straight bar section straight plate (4) and the connecting section straight plate (5) are fixed on the continuous section bottom plate (1) or the U-bar section bottom plate (2) through bolts (6).
3. The continuous closed stirrup bending device for fiber reinforced thermoplastic resin composite bars as set forth in claim 1, wherein the five straight bar segments (4) are rectangular.
4. A continuous closed stirrup bending device for fiber reinforced thermoplastic resin composite bars as set forth in claim 3, wherein long baffles (8) are fixed on the outer sides of the front and rear opposite straight plates (4).
5. The continuous closed stirrup bending device for fiber reinforced thermoplastic resin composite bars according to claim 3, wherein the outer sides of the other three straight bar section straight plates (4) are fixedly provided with short baffle plates (7).
6. The continuous closed stirrup bending device for fiber reinforced thermoplastic resin composite bars as set forth in claim 1, wherein the connecting section straight plate (5) comprises a rectangular body and an arc section, the arc section is connected to the side of the rectangular body to form an internal groove.
7. The continuous closed stirrup bending device for fiber reinforced thermoplastic resin composite bars according to claim 1, wherein universal wheels (9) are arranged at the bottoms of the continuous section bottom plate (1) and the U-bar section bottom plate (2).
8. A method of assembling a continuous closed stirrup bending device for a fiber reinforced thermoplastic resin composite bar as set forth in any one of claims 1 to 7, comprising the steps of: Firstly, selecting a continuous section base plate (1), a U-rib section base plate (2), a bending section sector plate (3), a straight rib section straight plate (4) and a connecting section straight plate (5) with corresponding sizes according to requirements, and fixing round holes of the bending section sector plate (3), the straight rib section straight plate (4) and the connecting section straight plate (5) on the continuous section base plate (1) and the U-rib section base plate (2) respectively by using bolts (6); step 2, determining the lengths of straight rib sections at two sides of a continuous closed stirrup 10, calculating to obtain the distance between a continuous section base plate (1) and a U rib section base plate (2), installing six groups of universal wheels (9) at the bottoms of the continuous section base plate (1) and the U rib section base plate (2), moving the universal wheels (9), and adjusting the distance between the continuous section base plate (1) and the U rib section base plate (2) to be a calculated value; And 3, locking the universal wheels (9) to keep the device stable, selecting the short baffle plates (7) and the long baffle plates (8) with corresponding sizes, ensuring that the short baffle plates and the long baffle plates can be sleeved in the bolts (6) at corresponding positions, finally taking down the short baffle plates (7) and the long baffle plates (8), and finishing the assembly of the continuous closed stirrup bending device after each size of the device is determined to be correct.
9. A method for bending a tendon using a continuous closed stirrup bending apparatus as set forth in any one of claims 1 to 7 for a tendon of a fiber reinforced thermoplastic resin composite, comprising the steps of: Firstly, heating an oven, putting fiber reinforced thermoplastic resin composite material straight ribs into the oven for heating, putting the composite material straight ribs into grooves on the inner sides of connecting section straight plates (5), bending and forming the connecting section straight plates (5), bending section sector plates (3) and straight rib section straight plates (4) on a continuous section bottom plate (1), sleeving short baffle plates (7) into bolts (6) on the straight rib section straight plates, and limiting the positions of rib materials; Bending and forming the remaining straight ribs around the bending section sector plate (3) and the straight rib section straight plate (4) on the U rib section bottom plate (2), and sleeving two short baffle plates (7) and one long baffle plate (8) into corresponding bolts (6) respectively to limit the formed stirrup parts; and finally, forming the straight bars around a bending die on the outer side of the straight plate (5) of the connecting section, sleeving a short baffle (7) and a long baffle (8), forming complete continuous stirrups, and taking down the baffles after the bars are completely cooled to obtain continuous closed stirrups (10).

Description

Continuous closed stirrup bending device and bending method for fiber reinforced thermoplastic resin composite material rib Technical Field The invention belongs to the field of stirrup bending devices, and particularly relates to a continuous closed stirrup bending device and a bending method for fiber reinforced thermoplastic resin composite material bars. Background FRP stirrups (fiber reinforced resin matrix composite stirrups, which are mainly GFRP/CFRP) can effectively solve the problem of concrete stripping caused by steel stirrup corrosion by virtue of high corrosion resistance, and are particularly suitable for chloride corrosion environments (such as ocean engineering and deicing salt bridges). The light characteristic of the composite material obviously reduces the transportation and installation cost, improves the construction efficiency, and has the tensile strength of 800-1600MPa. The engineering case shows that the GFRP stirrup enhances the lateral impact resistance of the cement-based composite material column by 35%, the residual bearing capacity is increased by 43%, and the structural toughness can be greatly improved. In addition, the insulation can avoid electromagnetic interference, and is suitable for special facilities (such as medical buildings and laboratories). The thermoplastic resins (e.g. polypropylene, acrylic acid) have the core advantage of reversible physical phase change properties of softening by heat (Tg above) -plastic flow-cooling hardening-strength recovery, supporting multiple remodelling and recycling, whereas thermosetting resins are not recyclable due to three-dimensional crosslinked networks, with annual average waste up to tens of thousands of tons. The thermoplastic resin has the advantages of extremely high elongation at break of the thermoplastic resin rib, better bending adaptability, extremely low water absorption in terms of damp-heat resistance and better interface stability in damp-heat environment than the thermosetting resin. Compared with steel stirrups, the thermoplastic stirrups have the advantages of breaking through durability, completely isolating moisture and corrosive media, reducing maintenance cost in a whole life cycle, breaking through light weight, enabling density to be only 1/4 of that of steel bars, supporting on-site rapid bending, optimizing earthquake resistance and energy consumption, enabling elastic modulus to be close to that of concrete, enabling thermal expansion coefficient to be matched, improving structural earthquake resistance with high damping property, prolonging service life of the structure, and reducing comprehensive cost. At present, the preparation and performance aspects of fiber reinforced thermoplastic resin composite continuous closed stirrups at home and abroad lack of devices suitable for rapid bending on the engineering site, and other stirrup bending devices have the problems of insufficient heating precision, low bending efficiency, limited product size, incapability of meeting the rapid bending on the engineering site and the like. Therefore, it is necessary to develop a fiber-reinforced thermoplastic resin composite material continuous closed stirrup bending device, which can prepare the fiber-reinforced thermoplastic resin composite material continuous closed stirrup with high precision and high efficiency, and adapt to the requirement of rapid bending on the engineering site. Disclosure of Invention In view of the above, in order to solve the problems that the existing device for rapidly bending the fiber reinforced thermoplastic resin composite material continuous closed stirrup is lack of suitable for rapid bending on the engineering site in terms of preparation and performance, and other stirrup bending devices have insufficient heating precision, low bending efficiency, limited product size, and can not meet the requirements of rapid bending on the engineering site, the invention provides a continuous closed stirrup bending device and a bending method for the fiber reinforced thermoplastic resin composite material. The technical scheme is that the continuous closed stirrup bending device for the fiber reinforced thermoplastic resin composite material rib comprises a continuous section base plate, a U-rib section base plate, four bending section sector plates, five straight rib section straight plates, a connecting section straight plate and a plurality of baffle plates, wherein the three straight rib section straight plates and the two bending section sector plates alternately form a U shape, the U shape is fixed on the U-rib section base plate, the connecting section straight plates, the two bending section sector plates and the two straight rib section straight plates alternately form the U shape, the U shape is fixed on the continuous section base plate, and the two U shapes are oppositely arranged. Furthermore, the bending section sector plate, the straight rib section straight plate and the conn