JPS5988986A - Structure for anchoring end part of cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a PC used for end fixing of cables, etc., especially for various structures made of prestressed concrete.
m 8, tension of cables used for suspension of bridges? i
This relates to the length of the end of the cable, etc. on which the first power acts, and the sleeve for fixing the end to each fffi structure.

As a conventional example of such a cable end fixing structure,
The fixation of the PCC cedar material 1 with the Kawako sleeve 2 will be explained with reference to FIG.

In the same figure, the sleeve 2 made of m is PCI by compression processing.
A fixed V is attached to the end of the fi material 1, and this structure can withstand static tensile loads by appropriately selecting the length and compression ratio of the phase-opening sleeve 2. The allowable stress is 1) The C1S material 1 has the ability to exhibit up to 95% to 99% of its own strength.

However, when a tensile tension tube is applied to the PC bonding material 1, the repeated stress of the PC671 material 1 itself is I.
8~2 Of((1/mm2 vs. iI'J n
Q fixing (repetitive stress between 13j is approximately 10 K (1/m
m2, which decreases to approximately 50%.

Then, when C fixation (Jj on h structure, static tensile load m and 4 times repeated tensile load) Q is applied, the position where fatigue failure of p cyn material 1 occurs is shown in Fig. 1. This is the part inside the mouth part 2a of the octopus sleeve 2 and in contact with the inner surface thereof.

1) Compared to the repetition stress of the Cffl material 1 material layer itself, the reason why the repetition stress of the fixed 4I; PC...A strong IJg shearing force is acting on material 1,
(b) PC steel material 1, silk sleeve 2 and other PC steel material 1
Since it is fixed by the frictional force between the outer circumference of the PCM material 1 and the inner surface of the silk sleeve 2, when a static tensile load or a repeated tensile load is applied to the PCM material 1, adhesion breaks at the mouth portion 2a, and the PCM material 1, a small amount of particles will come out from the mouth part 2a, and when the load decreases, i.e., when the repeated tensile load decreases, a phenomenon will occur where the exposed portion elastically recovers.

As described in (a) and (b) above, the PC steel material 1 rubs against the inner surface of the steel sleeve 2 under the action of shear force, causing corrosion called micro-movement corrosion, and at the same time, fatigue cracks occur in the PCl material 1. Eventually, the fatigue limit is exceeded and it breaks.

The present invention eliminates the drawbacks of the conventional end anchoring structure as described above, and provides an end anchoring structure for cables, etc., which has excellent durability without causing fatigue cracks under the action of static tensile loads and repeated tensile loads. The purpose is to provide the following.

A) The object of the present invention is to improve the inner surface 11 of a cylindrical sleeve.
9. In the singular name, a plurality of tapered parts and a hole for cable pressure ↑1 are provided in succession, and the cable is inserted into the hole.
ID the department! At the same time, epoxy 4. It is characterized by injecting and hardening a curable resin such as Fl resin, and achieves J stiffness at the end of the cable, etc., up to a width of 11".

Embodiments of the present invention will be described below with reference to FIGS. 2 to 4.

Figure 2152 shows a sleeve 5 made of fil before compression processing.-C1 The cylindrical resin injection tube part 6 and the cable insertion tube part 7 are integrally molded, and the outer diameter of the resin injection tube part 6 is [)l.
and the cable R (outer diameter 1 of the insertion tube portion 7) 2 satisfy Di<D2 with the outer circumferential tapered portion 6a as a boundary.

Nine equal-diameter holes 8 for cable insertion are provided inside the cable insertion tube 7 in its axial direction.

Inside the resin injection cylinder part 6, there is provided a tapered part 9 which has the same axis as the hole part 8 and whose diameter increases from the mouth part 6b side to the hole part 8 side. Tapered portion 9
The maximum diameter side of the hole 8 is communicated with the hole 8. , 10 is an injection hole that extends through the tapered portion 9 from the outer periphery of the resin injection cylinder portion 6 .

With the end 11a of the cable 11 inserted into the hole 8 of the sleeve 5 described above, as shown in FIG. 11a is pressed onto the inner periphery of the hole 8. Further, as shown in FIG. 4, a curable resin 12 such as epoxy resin is injected from the injection hole 10 into the gap 13 formed between the tapered portion 9 and the outer periphery of the cable 11 and hardened.

Note that the injection hole 10 is eliminated and the mouth portion 6 of the tapered portion is
It is also possible to inject from 11.

As described above, by fixing the end portion 11a of the cable 11 inside the sleeve 5, the end fixing structure A for the cable 11 etc. is constructed, and its operation will be explained next.

When repeated tensile loads are applied to the cable 11 in addition to static tensile loads, the end fixing 4h construction △
The stress generated in
This is shared by the adhesion force F2 between the outer circumference and the inner circumferential surface of the hole E3 of the cable insertion tube q.

Therefore, the static and repeated tensile load is the adhesive force F1
Therefore, the tensile load transmitted to the interface 13 between the tapered portion and the hole 8 can be reduced.

This means that the phenomenon in which the cable 11 pulls out from the interface 13 toward the curable resin 12 under the action of repeated loads is reduced.

Furthermore, since the curable resin 12 is hardened in a tapered shape that widens from the mouth portion 6a toward the boundary surface 13, when a repetitive load is applied, in addition to the adhesive force Fl, the outer periphery of the curable resin 12 A root action occurs between the inner circumferences of the tapered portion 9, and the end 11a of the cable 11
This further prevents leakage to the lfi curable resin 12 side.

In addition, even the adhesion length between the curable resin 12 and the cable 11 is as follows.
It is determined by the tensile load acting on the cable 11 and the adhesive force of the curable resin 12, but the minimum length must be able to withstand the difference between the upper and lower limits of the tensile load, that is, the amplitude load. Select the length necessary to obtain J3.

FIG. 5 shows another embodiment, in which tapered portions 9a and 9b are formed coaxially in two steps inside the sleeve 5 to form an end fixing structure shown in the same figure. The cable insertion tube part 7 is fixed to the end part 11a of the cable 11, and the curable resin 12 is press-fitted into the tapered parts 9a and 9b through the injection holes 10 and hardened. .

The end fixing structure 114 formed in this way is similar to the above-mentioned end fixing structure Δ in that the tensile load is applied to the adhesive force between the outer periphery of the cable 11 and the hardening resin 12 and the end 11a of the cable 11. This is to share the adhesion force with the cable fitting tube part 6, and to prevent the cable 11 from coming out from the boundary surface 13.

In addition to the embodiments described above, the tapered part into which the curable resin is press-fitted and hardened may be formed in any number of stages, such as three or four stages.

：1゛In addition, in the above-mentioned embodiment, when the p story 1 part fixing structure △, A- is configured at the end of the cable 11, Various I such as stranded wire
) Clid 44, wire lobes, silk cables, etc., can be used to construct the anchoring structure at the end of the moon.

As is clear from the above description, the end fixing structure of the present invention, such as a couple, has a single or multiple tapered part connected to a cable fixing hole formed on the inner surface of a cylindrical sleeve. By fixing the ☆21 part of the cable, etc. in the hole, and injecting and hardening a curable resin into the gap formed between the J-shaped part and the outer circumference of the cable, the repeated tension applied to the cable is ′ of the load
The stress can be shared between the adhesive force of the curable resin and the adhesive force generated between the hole of the sleeve and the end of the cable,
The end of the cable may break under the action of repeated loads, resulting in 1% l? Specifically, it can prevent the phenomenon of breakage, and is extremely durable and has high usability.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is an abbreviated cross-sectional view showing a conventional p:; one-part fixed structure; Fig. 3 is an abbreviated sectional view showing a state in which the end of the cable is fitted into the above sleeve, Fig. 4 is an abbreviated sectional view of an embodiment of the end fixing structure of the present invention, and Fig. 5 is an abbreviated sectional view of the end fixing structure of the present invention. It is an F8 sectional view showing another embodiment of <n construction. C, Δ′... End fixing structure, 5... Sleeve, 8... Hole,
9...Tapered part, 11...Cable, 11a...End part, 12...Curing resin, 13...Void part . Patent applicant Shinsugi Technology Co., Ltd. Agent Patent attorney Sasaki
Gong Figure 1 Figure 2 Figure 5

Claims (1)

[Claims] (1) On the inner surface of the cylindrical sleeve, a single or multiple stages of debar-like parts and a hole for cable crimping are provided in series, and the end of the cable is inserted into the hole and crimped and fixed. An end chamber such as a tar pull formed by injecting and hardening IIR such as epoxy resin into the gap formed between the shaped part and the outer circumference of the cable.
'Il construction.