JPH0348246Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an end fixing device for a tension cable, which is used, for example, as an end fixing device for a diagonal member of a cable-stayed bridge.

(Prior Art) Conventionally, in a cable-stayed bridge constructed by suspending a bridge deck 2 from a tower 1 with diagonals 3 as shown in FIG. The cable has a structure in which a plurality of tension cables 5 are accommodated, the upper end of which passes through a hole 6 of a tower 1 serving as a support together with the sheath 4, and is fixed by an end fixing device 7 after passing through the tower 1. and its lower end connects the hole 8 of the deck 2 as a support to the sheath 4.
After passing through the deck 2, it was fixed by the end fixing device 9. In this case, the base end of the end fixing device 7 is supported by the tower 1. The anchor block 10 is provided with a common tapered hole 11, each tension cable 5 is passed through the tapered hole 11 under tension, and each end of the anchor block 10 is fixed with a fixing means 12. The gap between the fixed tension cable 5 and the inner surface of the tapered hole 11 is filled with a curable resin 13 such as epoxy resin.

In this example, the fixing means 12 is composed of a fixing plate 14 supported at the tip of the anchor block 10, and a grip 15 crimped onto the end of each tension cable 5 passing through the fixing plate 14. . Similarly, the end fixing device 9 is connected to the deck 2.
A common tapered hole 17 is bored in this anchor block 16, and each tension cable 5 is passed through this tapered hole 17 under tension, and the anchor block 16 is The ends of the tension cables 5 that have passed through are fixed by the fixing means 18, and the gap between the inner surface of the tapered hole 17 and each tension cable 5 is filled with a curable resin 19. ing. In this example, the fixing means 18 includes a fixing plate 20 supported at the tip of the anchor block 16;
The fixing plate 20 is configured with a wedge 21 to which each tension cable 5 passing through the fixing plate 20 is fixed.

(Problem to be Solved by the Invention) However, in such a fixing device, each tension cable 5 is passed through the common tapered hole 11 of the anchor block 10 and solidified all at once with the curable resin 13. Therefore, the tensile cable 5 existing in the center of the tapered hole 11 and the tensile cable 5 on the inner circumferential side of the tapered hole 11 have different yield strength and displacement when subjected to a load during use, and the amount of displacement is different. There was a problem in that the load was concentrated on a small number of tension cables, resulting in increased fatigue and increased susceptibility to breakage.

In addition, in order to give uniform proof stress to each tension cable, it is necessary to reduce the elasticity of the curable resin 13, which reduces the amount of movement of the tension cable, making it difficult to disperse stress. The point was hot. Furthermore, since all tension cables 5 are passed through the common taper hole 11 of the anchor block 10 and hardened with hardening resin 13, even if one tension cable 5 is pulled out, all tension cables 5 will not be affected. A number of problems arose. And also,
Since the tapered hole 11 has a shape in which the inner diameter increases continuously from one end to the other, a long tapered hole 11 is required to increase the yield strength. When attempting to form a plurality of tapered holes 11 that are individually fastened, the inner diameter of each tapered hole 11 becomes larger on the tip side of the anchor block 10, which causes the problem that the outer diameter of the anchor block 10 must be significantly increased. It was hot.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tension cable end fixing device that can individually fix each tension cable within a common anchor block without increasing the size of the anchor block.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a structure in which the proximal end of an anchor block is supported by a support, and a plurality of tensile tension cables are passed through the anchor block. In the tension cable end fixing device, the ends of these tension cables are fixed by a fixing means on the distal end side of the anchor block. A plurality of repeatedly formed multi-stage taper holes are arranged in parallel, each of the tension cables in a tensioned state is passed through each of the multi-stage taper holes, and the tension cable is formed between the inner surface of each of the multi-stage taper holes and the tension cable. A feature is that each void is filled with a curable resin such as an epoxy resin.

(Function) By providing a tapered hole in which the tapered hole portion is continuously repeated in the longitudinal direction in the anchor block as described above, even if the length of the anchor block becomes long, the tip side of the anchor block can be It is possible to suppress an increase in the inner diameter of the taper hole, and it is possible to suppress a significant increase in the outer diameter of the anchor block even though a plurality of multi-stage taper holes are arranged in parallel in a common anchor block. Furthermore, if the tension cables are hardened with a curable resin in each of these multi-stage tapered holes, the displacement of the tension cables can be equalized between the center side and the outer peripheral side of the anchor block. Furthermore, if the tension cables are individually processed within each multi-step tapered hole, even if one thread is pulled out, the entire tension cable will not be affected.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. Note that portions corresponding to those in FIG. 7 described above are designated by the same reference numerals. As shown in FIGS. 1 to 4, in the end fixing device 7 for the tension cable 5 of this embodiment, the anchor block 10
is supported on the support (tower) 1 by a nut 22 screwed on its outer periphery. anchor block 1
0 is provided with a plurality of multi-stage tapered holes 24 in which tapered hole portions 23 are continuously and repeatedly formed in the longitudinal direction. Further, a resin filling hole 25 and a connecting bottle hole 26 are provided through the anchor block 10. Each multi-stage tapered hole 24 and a resin filling hole 25 are provided on the base end surface of the anchor block 10.
A pressure equalizing resin chamber 27 is formed as a recess in common to both. A tension cable 5 is passed through each multi-stage tapered hole 24 under tension.
A curable resin 13 is filled and hardened in the gap between the inner surface of the multi-step tapered hole 24 and the tensile cable 5 in the tensioned state. The tension cable 5 may be a single wire or a twisted wire.

In addition, the tension cable 5 inside the sheath 4
There are two cases: twisted and untwisted, and either one is acceptable. Each multi-stage taper hole 2
The end of the tension cable 5 passing through 4 is fixed by fixing means 12. The fixing means 12 of this embodiment includes a bolt 2 at the tip of the anchor block 10.
The fixing plate 14 is supported by a fixing plate 8 and a wedge 29 fixing the end of each tension cable 5 passing through the fixing plate 14. A cap 30 housing the fixing means 12 is screwed onto the tip of the anchor block 10. A resin injection pipe 31 passes through the cap 30 and is connected to the resin filling hole 25. The cap 30 is provided with an exhaust hole 32. At the base end of the anchor block 10, a lid 33 is abutted and fixed with a bottle 34. A spacer 35 is supported on the lid 33, and the tension cable 5 is centered in the multi-stage tapered hole 24. The spacer 35 is provided with a communication groove 36 that communicates the multi-stage tapered hole 24 and the pressure equalization resin chamber 27. A press plate 37 is stacked on the lid 33.

This presser plate 37 is connected to the anchor block 10 by a connecting bolt 38 passing through the connecting bolt hole 26 of the anchor block 10 and a nut 39 screwed onto the connecting bolt 38.
is fixed. The holding plate 37 is sealed with a seal rubber 40 that seals the portion of the lid 33 through which the tension cable 5 passes.

Within the hole 6 of the support 1, the tension cables 5 are kept apart from each other by spacers 41. Hole 6
A support tube 42 whose one end is supported by the anchor block 10 is inserted inside, and a shoe holder 43 is supported at the tip of this support tube 42, and the end of the sheath 4 is fixed to this shoe holder 43. There is.
The shoe holder 43 is slidably positioned by a ring 45 supported on the inner periphery of the hole 6.

Such a tensioning cable end fixing device applies tension to each tensioning cable 5 in a state of tension, and connects the resin injection pipe 31 to the resin filling hole 25, the pressure equalization resin chamber 27, and the communication groove. The multi-stage tapered hole 24 is filled with the curable resin 13 through the step 36, and the air is exhausted through the exhaust hole 32 to ensure sufficient filling.

FIG. 5 shows an example of the end fixing device 9. This end fixing device 9 has an anchor block 16 supported by a stepped portion 16A on a support (deck) 2, and this anchor block 16 is also provided with a multi-step tapered hole 47.
Each of the multi-stage tapered holes 47 is penetrated by the tensile cable 5 in a tensioned state. A curable resin 19 is filled in the gap between the inner surface of the multi-step tapered hole 47 and the tensile cable 5 in the tensioned state and is hardened. The end of each tension cable 5 passing through the anchor block 16 is connected to the anchoring means 18.
It is established in Fixing means 18 in this embodiment
The fixing plate 20 is supported at the tip of the anchor block 16, and the grip 48 fixes each tension cable 5 passing through the fixing plate 20.

Each grip 48 is held down by a holding plate 49, and the holding plate 49 is fixed to the fixing plate 20 with bolts 50. A cap 51 is fixed to the tip of the anchor block 16, accommodating the fixing means 18. A pressure-equalizing resin chamber 52 is formed at the base end of the anchor block 16, and a lid 53 is provided to close this chamber as in FIG. 1, and a presser plate 54 is provided to overlap this. A resin filling hole 55 reaching the pressure equalizing resin chamber 52 is formed in the anchor block 16, and a resin injection pipe 56 penetrating the cap 51 is connected to the resin filling hole 55. An exhaust hole 57 is formed in the cap 51.

(Effect of the invention) As explained above, the tension cable end fixing device according to the invention has a multi-step tapered hole in which the tapered hole is continuously repeated in the longitudinal direction in the anchor block. Therefore, even if the length of the anchor block becomes long, the increase in the inner diameter of the taper hole at the tip side of the anchor block can be suppressed, and therefore, even if a plurality of multi-stage taper holes are arranged in parallel on a common anchor block, Regardless, it is possible to suppress an increase in the outer diameter of this anchor block.

Furthermore, in the present invention, since the multi-stage tapered holes are fixed with a curable resin filled, it is possible to equalize the amount of displacement of the tension cable between the center side and the outer peripheral side of the anchor block. Furthermore, in the present invention, since the tension cables are individually fixed in each multi-stage tapered hole with a curable resin, there is an advantage that even if one thread is pulled out, the whole tension cable is not affected.

[Brief explanation of drawings]

1 to 4 show an embodiment of the tension cable end fixing device according to the present invention,
Figure 1 is a sectional view taken along line A-A in Figure 2, and Figure 2 is a cross-sectional view of Figure 1.
3 is a sectional view taken along the line C-C in FIG. , FIG. 5 is a longitudinal cross-sectional view of another embodiment of the tension cable end fixing device according to the present invention, FIG. 6 is a side view showing an example of a cable-stayed bridge, and FIG. 7 is a side view showing an example of a cable-stayed bridge. FIG. 2 is a longitudinal cross-sectional view showing an example of a conventional edge fixing device. DESCRIPTION OF SYMBOLS 1... Support body, 4... Sheath, 5... Tension cable, 6... Hole, 7... End fixing device, 10...
...Anchor block, 2...Fixing means, 13...
Curable resin, 23...Tapered hole portion, 24...Multi-step tapered hole.

Claims (1)

[Scope of utility model registration request] The proximal end of the anchor block is supported by the support,
A plurality of tensile cables in a tensioned state are passed through the anchor block, and the ends of these tension cables are fixed in a tension cable end fixing device which is fixed by a fixing means on the distal end side of the anchor block. , a plurality of multi-stage taper holes in which tapered hole portions are continuously and repeatedly formed in the longitudinal direction are arranged in parallel in the anchor block, and each of the tension cables in a tension state is passed through each of the multi-stage taper holes, respectively. 2. An end fixing device for a tension cable, wherein a curable resin such as an epoxy resin is filled in a gap between the inner surface of each of the multi-stage tapered holes and the tension cable.