Classifications

• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
  • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
  • E04C5/08—Members specially adapted to be used in prestressed constructions
  • E04C5/085—Tensile members made of fiber reinforced plastics
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
  • E01D1/00—Bridges in general
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
  • E01D15/00—Movable or portable bridges; Floating bridges
  • E01D15/12—Portable or sectional bridges
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
  • E01D2101/00—Material constitution of bridges
  • E01D2101/30—Metal
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
  • E01D2101/00—Material constitution of bridges
  • E01D2101/40—Plastics

Definitions

• the invention relates to a tension rod for use as a chord for bridges, having a middle part made of fiber composite and having ends made of metal material.
• Fiber composites exhibit high stiffness and strength relative to their specific density. This property makes them especially valuable for lightweight construction applications. Advantages are realized especially when the fibers can be subjected to tensile stress in the lengthwise direction.
• Structural elements of this kind are subjected primarily to locally concentrated forces which often also have different directions in space.
• winding techniques are used in which the fibers are wound at the end around a metal eye. This is a very expensive method for manufacturing, quality assurance, and monitoring of service life.
• An object goal of the invention is to provide a tension rod made of fiber composite material for use as a chord for mobile bridges.
• a tension rod for use as a chord for bridges comprising at least one chord including: a middle part made of a fiber composite material; and a pair of end parts made of a metallic material, wherein each of said end parts is connected to said middle part via a glued tapered overlap, the middle part and the end parts having rectangular cross sections at said overlap, a length of said overlap being greater than a thickness of the tension rod at the overlap, and said overlap of the fiber composite part and the metal part extending bladewise on the thin sides.
• a tension rod comprising at least one chord including: a middle part made of a fiber composite material, said middle part having a rectangular cross section which gradually decreases in thickness at each longitudinal end to define tapered connection areas; a pair of end parts made of a metallic material, each of said end parts having a rectangular cross section which gradually decreases in thickness at one longitudinal end to define a tapered connection area which matingly corresponds to the respective tapered connection area of the middle part; and a glued connection between said tapered connection areas of the middle part and said tapered connection areas of the end parts, respectively.
• a method of making a tension rod comprising: providing a middle part made of a fiber composite material, said middle part having a rectangular cross section which gradually decreases in thickness at each longitudinal end to define tapered connection areas; providing a pair of end parts made of a metallic material, each of said end parts having a rectangular cross section which gradually decreases in thickness at one longitudinal end to define a tapered connection area which matingly corresponds to the respective tapered connection area of the middle part; and gluing said tapered connection areas of the middle part to said tapered connection areas of the end parts, respectively.
• the subject of the invention is the introduction of forces into, or their departure from, a fiber composite by a tapered overlap designed according to the invention with the following properties:
• the fiber composite can be manufactured economically; manufacture can be automated.
• the metal end fittings are likewise parts that are simple to manufacture.
• a chord consists of only two different individual parts which therefore can be manufactured in correspondingly large numbers.
• chords are reliable, error-tolerant, and readily checked.
• chords The reliability of the chord depends to a large degree on the quality of gluing during manufacture.
• chords can be checked 100% following each workstep using conventional methods such as ultrasound or x-rays.
• the reliability of the chord also depends on a possible aging of the glue during operation by the penetration of water vapor.
• the design of the tapered overlap provides the highly stressed large-area glued connections of the overlap relative to the environments with excellent protection by the metal fittings against the penetration of water vapor.
• the very small lateral surfaces can be protected with known methods, for example by a glued metal film, 0.1 to 0.3 mm thick.
• chords can also be checked as double or multiple chords using the same test procedures as during manufacture .
• Figures 1 and 2 each show a side view of an individual chord with overlapping fiber-remforced plastic composites according to a preferred embodiment of the present invention
• Figure 3 is a side view of a double chord, glued together from the individual chords of Figure 1 and Figure 2;
• Figure 4 is a top view of the double chord of Figure 3;
• Figure 5 is a sectional view taken along A-A m Figure 4;
• Figure 6 is a sectional view taken along line B-B in Figure 4.
• Figure 7 is a sectional view taken along line C-C in Figure 4.
• Figure 8 is a side v 3 ew of a multiple chord composed of three double chords of Figures 3 and 4 glued together, and
• Figure 9 is a sectional view taken along D-D in Figure 8.
• Figures 1, 2, 3, 4, and 8 are drawn on the same page to make them easier to understand because Figure 4 may be viewed as a top view of each of the chords shown above.
• Figure 1 shows a tension rod 2 as a single chord 4 having a middle part 6 made of a fiber composite material and having end parts 8 which are metal tabs 10, each of which has a hole or an eye 12 ( Figure 4) .
• Metal tab 10 and fiber composite material middle part 6 are glued together by means of a glued tapered overlap 14 (glued connection) .
• Figures 1 and 2 each show an individual chord 4 with overlapping fiber-reinforce ⁇ plastic composites facing one another. Gluing together the individual chords in Figure 1 and 2 produces the ⁇ ouble chord 16 in Figure 3. Basically, the two individual chords 4 in Figure 1 and Figure 2 are the same.
• the tapered overlap 14 that appears mirror- symmetrically in Figures 1 and 2 is pro ⁇ uced by rotating chord 4 in Figure 2 180° around its lengthwise axis relative to chord 4 m Figure 1.
• Sectional views A-A, B-B, and C-C m Figures 5, 6, and 7 show the various cross-sections of the ⁇ ouble chord 16 in Figure 3 and Figure 4.
• end parts 8 inwardly-facmg sides of the metal tabs 10 of the adjacent chords 4 of the double chord 16 are directly connected to each other via a glued connection 14, as shown in Figure 5.
• the metal tabs 10 have a tapering cross-section as viewed from the side in Figure 3, with the fiber composite material middle parts 6 having a matingly corresponding tapering cross-section.
• each metal tab 10 is connected to the matingly corresponding tapering areas of its respective fiber composite material middle part 6 via a glued connection 14, and the opposite (i.e., inwardly-facing) sides of the middle part 6 are connected to each other via a glued connection 14, as shown in Fig. 6.
• a glued connection 14 At the central portion of the double chord 16 between the overlap areas 18, inwardly facing sides of the fiber composite material middle parts 6 of the adjacent chords 4 of the ⁇ ouble chord 16 are directly connected to each other via a glued connection 14, as shown in Fig 7.
• the overlap area 18 is much longer than the thickness of the tension rod.
• the overlap area may be, for example, 50 times longer than the thickness of the tension rod.
• the overlaps extend bladewise toward the thin sides .
• Figure 8 shows a multiple chord 20 glued together from three double chords in Figure 3.
• Figure 9 shows a section in the vicinity of tapered overlap 18.
• any number of double chords may be glued together to form a composite chord, depending upon the design specifications.
• An example of an embodiment of a typical individual chord 4 in Figures 1 and 2 has a thickness of 10-20 mm, a width of 130-200 mm, and a length of 5-10 meters.
• the fiber composite consists primarily of lengthwise oriented carbon fibers with a heat- curing epoxy resin matrix.
• the metal fittings are made of steel, titanium, or aluminum.
• Heat-curing adhesive on a "carrier fabric mm. 120°C-system" is used as an adhesive connection.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Laminated Bodies (AREA)
• Bridges Or Land Bridges (AREA)
• Ropes Or Cables (AREA)

Priority Applications (3)

Applications Claiming Priority (1)

Publications (1)

Family

ID=8167372

Family Applications (1)

Country Status (3)

Cited By (1)

Citations (4)

• 1999
  • 1999-07-14 JP JP2001511264A patent/JP4115702B2/ja not_active Expired - Fee Related
  • 1999-07-14 KR KR1020027000072A patent/KR100592160B1/ko not_active IP Right Cessation
  • 1999-07-14 WO PCT/EP1999/004992 patent/WO2001006062A1/en active IP Right Grant

Patent Citations (4)

Also Published As

Similar Documents

Legal Events