JPH1060814A - Waterproof cover for cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof cover capable of being simply fitted by reducing deformation even if the eccentricity is generated to a cable and a fixed pipe and without enlarging the size. SOLUTION: An elastic cover 4 is constituted of a cylinder section 4b with a small diameter fitted to a cable 2, a cylinder section 4c with a large diameter fitted to a fixed pipe 3 and a conical and cylindrical main body 4a monolithically providing both cylinder sections 4b and 4c coaxially to both ends thereof. Then, bearing surfaces such as both taper surfaces M1 -M4 varying an angle to the axial direction from the midway of the axis in the cylinder section are provided to the inside circumferential surfaces of the cylinder section 4b and 4c, and when the eccentricity is generated to the cable 2 and fixed pipe 3, the bearing surfaces are brought into contact with both of them to reduce deformation caused by twist and strain of the main body section 4a due to the eccentricity, and fitting work efficiency is improved together with the outward appearance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber which is attached to a fixing portion on a structure side of a cable for supporting a structure such as a cable-stayed bridge, and which prevents rainwater or the like from entering the fixing portion of the cable. The present invention relates to a waterproof cover for cables such as a cover.

[0002]

2. Description of the Related Art For example, in a cable-stayed bridge, a plurality of cables 2 support a static load and a dynamic load applied to a bridge girder 1 as shown in FIGS. The cable 2 extends obliquely upward from the bridge girder 1 and suspends and supports the bridge girder 1. At the base end of the cable 2 fixed to the bridge girder 1, a cylindrical cable protection fixing tube 3 is fitted. The fixing tube 3 is fixed diagonally to the end girders 1, and the cable 2 extends along the center line of the fixing tube 3.
Is installed.

When rainwater enters the fixing tube 3 along the cable 2, the fixing tube 3 and the base end of the cable 2 are corroded. To prevent this corrosion, the fixing portion between the cable 2 and the fixing tube 3 is fixed. An elastic waterproof cover 10 such as a rubber cover is attached. The waterproof cover 10 has a split portion 10d at one position in the axial direction.
A small-diameter cylindrical portion 10b fitted to the cable 2, a large-diameter cylindrical portion 10c fitted to the fixing tube 3, and both ends of the cylindrical portions 10b and 10c in the axial direction. The main body 10a has a conical cylindrical shape and is integrally formed with the main body.

The installation of the waterproof cover 10 is performed as follows. The waterproof cover 10 is opened from the divided portion 10d to cover the base end of the cable 2 and the fixing tube 3, the small-diameter cylindrical portion 10b is fitted to the cable 2, and the large-diameter cylindrical portion 10c is fitted to the fixing tube 3. In this state, the divisions 10d are tightened with bolts 14 in a watertight manner. Thereafter, the posture of the waterproof cover 10 is regulated so that the divided portion 10d side of the waterproof cover 10 faces downward, and then the clamp bands 11,
The small-diameter cylindrical portion 10b is fixed to the cable 2 in a watertight manner, and the large-diameter cylindrical portion 10c is fixed to the fixing tube 3 in a watertight manner.

[0005]

Figure 9 An invention is to provide a state where the center line L ₂ of the center line L ₁ and the cable 2 of the fixing tube 3 were almost the same is shown, in this case, the cylindrical portion 10b of the waterproof cover 10, 1
0c is the fixing tube 3 and the cable 2 with almost no eccentricity.
And the main body 10a maintains a normal conical cylindrical shape with almost no deformation. However, in the cable-stayed bridge under construction, the center of the fixing tube 3 and the center of the cable 2 are often displaced due to factors such as a variation in static load and a manufacturing error of the structure, and when the displacement is large, as shown in FIG. There was a problem that the main body 10a of the waterproof cover 10 was greatly deformed.

FIG. 11 shows that the center line L 2 of the cable ₂ is shifted downward with respect to the center line L ₁ of the fixing tube 3 so as to be close to the maximum value.
Is shown, the waterproof cover 1 in this case is shown.
In the case of 0, the lower side of the main body 10a is compressed in the axial direction to be corrugated, and the opposite upper side is pulled in the axial direction to be tensed. Such deformation of the waterproof cover 10 not only degrades the appearance of the cover, but also requires that the waterproof cover 10 be attached to the cable 2 and the fixing tube 3 while deforming the waterproof cover 10, thereby causing a problem that the mounting workability is deteriorated. .

As a means for solving such a problem, for example, a waterproof cover 13 shown in FIG. 12 is disclosed in Japanese Utility Model Laid-Open No. 5-54608. The waterproof cover 13 includes a small-diameter cylindrical portion 13b fitted to the cable 2, a large-diameter cylindrical portion 13c fitted to the fixing tube 3, and a main body extending in a conical cylindrical shape from the small-diameter cylindrical portion 13b. The elastic cover 13a has a bellows-like portion 13e for integrally connecting the large-diameter end of the main body 13a and the large-diameter cylindrical portion 13c. As shown in FIG.
When the cable 2 and the cable 2 are eccentric by the amount of eccentricity t, the eccentricity is absorbed by the radial expansion and contraction deformation of the bellows-like portion 13e, thereby suppressing large deformation of the main body 13a. Therefore, the waterproof cover 1
In No. 3, it is known that the mounting work is easy and the appearance of the cover is almost stable.

However, in the case of the waterproof cover 13 shown in FIG.
The width of the bellows portion 13e is determined by the amount of eccentricity t between the fixing tube 3 and the cable 2.
In view of the necessity of setting in consideration of the maximum value, there is a problem that the width is increased and the main body 13a has a large outer diameter. Actually, the waterproof cover has become larger, for example, with an outer diameter of 700 mm and a total length of 600 mm, etc. due to the recent increase in length of the bridge. Not a good idea,
At present, improvement measures are being requested.

It is an object of the present invention to provide a waterproof cover for a cable which can be easily mounted with little deformation even if the cable and the fixing tube are eccentric and which does not increase in size, and which does not increase the size. Is to do.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a cable stretched over a structure and the outer periphery of each of a cylindrical cable protection fixing tube externally fitted to a base end of the cable on the structure side. In a waterproof cover made of an elastic material having a substantially conical cylindrical main body part integrally formed at both ends thereof with a cylindrical part partially fitted to the inner surface of at least one of the cylindrical parts at both ends of the main body part, The object is achieved by providing a shape having a seat surface whose angle with respect to the axial direction changes continuously or stepwise from the middle of the axial direction.

Here, the seating surface whose angle with respect to the axial direction changes continuously or stepwise from the middle of the cylindrical portion in the axial direction,
The tapered surface is inclined with respect to the cylinder axis direction, and the curved surface is bent in the cylinder axis direction. If such a seating surface is formed partially or entirely on at least one inner peripheral surface of the cylindrical portion at both ends of the waterproof cover, the cylindrical cover is fitted when the waterproof cover is fitted to the eccentric cable and the fixing tube. The seating surface of the portion abuts on the cable or the fixing tube, thereby suppressing the deformation of the waterproof cover due to the eccentricity.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. The embodiments shown in FIGS. 1 to 7 are applied to the waterproof cover attached to the cable 2 and the fixing tube 3 in the cable stayed bridge shown in FIG.

The waterproof cover 4 shown in the first embodiment of FIG. 1 is an elastic product such as rubber attached to the cable 2 and the fixing tube 3 as shown in FIG. The small-diameter cylindrical portion 4 fitted to the cable 2 at the small-diameter side opening end is formed integrally with the large-diameter cylindrical portion 4 fitted to the fixing tube 3 at the large-diameter opening end. Further, the waterproof cover 4 integrally has a divided portion 4d at one location in the axial direction, and opens the divided portion 4d to be fitted to the cable 2 and the fixing tube 3, and the respective tubular portions 4b,
4c is watertightly wound around the corresponding cable 2 and the fixing tube 3 by the clamp bands 5 and 6.

The waterproof cover 4 of the first embodiment includes
A seat surface M whose angle with respect to the cylinder axis direction Z is partially or entirely provided on the inner peripheral surfaces of b and 4c. More specifically, the seat surface M is a double tapered surface M ₁ , M ₂ and M ₃ , M _{4 obtained} by bisecting the inner peripheral surface of each of the cylindrical portions 4 b, 4 c in the axial direction. On the inner peripheral surface of the small-diameter cylindrical portion 4b, the outer tapered surface M ₁ of a predetermined positive (+) inclination angle theta ₁ with respect to the tubular portion axial direction Z, the negative (-) inner tapered surface of the inclined angle theta ₂ M ₂ is formed. On the inner peripheral surface of the large-diameter cylindrical portion 4c,
Predetermined positive with respect to the tubular portion axis Z (+) inner tapered surface M ₃ of the inclination angle theta ₃ and minus (-) outer tapered surface M ₄ of the tilt angle theta ₄ is formed.

Each of the inclination angles θ _{1 to} θ ₄ is substantially the same set value obtained by a calculation formula based on the total length of the waterproof cover 4 and the difference between the outer diameters of the fixing tube 3 and the cable 2. For example, as shown in FIG. 3, when the fixing tube 3 and the cable 2 are eccentric with an eccentric amount t close to the maximum value, the waterproof cover 4 is attached to the fixing tube 3 and the cable 2.
Is freely fitted to the outside without deformation, the waterproof cover 4 moves from the center line L ₁ of the fixing tube 3 to the center line L of the cable 2.
₂ tilt in the eccentric direction. The center line L ₁ of the fixing tube 3 at this time
The inclination angle of the center line of the waterproof cover 4 with respect to is calculated by a calculation formula based on the total length of the waterproof cover 4 and the outer diameter difference between the fixing tube 3 and the cable 2, and the respective inclination angles θ _{1 to} θ ₄ are set.

Therefore, the waterproof cover 4 of the first embodiment shown in FIG. 1 is always attached to the fixing tube 3 and the cable 2 in a good condition as shown in FIG. 2 or FIG. FIG. 2 shows a case where the fixing tube 3 and the cable 2 are not eccentric. In this case, since the respective cylindrical portions 4b and 4c are fitted coaxially around the corresponding cable 2 and the fixing tube 3, 6, the main body 4a is not deformed and the respective cylinders 4b, 4b
The inner peripheral surface of c is elastically deformed and fixed to the cable 2 and the fixing tube 3 in a watertight manner.

[0017] Figure 3 is a case where the cable 2 is eccentric to the fixing tube 3, to tilt waterproof cover 4 in the eccentric direction, the outer tapered surface M ₁ located on the slope upper small-diameter cylindrical portion 4b, inclination deformation of the small-diameter side of the body portion 4a by the inner tapered surface M ₂ located in the lower contacts the cable 2 is suppressed, the lower slope as an inner tapered surface M ₃ located on the slope upper large-diameter cylindrical portion 4c outer tapered surface M ₄ where there is deformation of the large diameter side of the main body portion 4a is inhibited by contact with the fixing tube 3. Therefore, even if each of the cylindrical portions 4b and 4c is wound and fastened with the clamp bands 5 and 6, the main body portion 4a is hardly deformed.
The mounting of the waterproof cover 4 in this case can be performed simply as in the case of FIG. 2, and the appearance of the cover after the mounting is also good.

Further, the waterproof cover 4 is provided with the cylindrical portions 4b, 4c.
Since the two tapered surfaces M _{1 to} M ₄ have a structure in which the eccentricity of the fixing tube 3 and the cable 2 is absorbed, the outer diameter of the main body portion 4a needs to be slightly larger than the outer diameter of the fixing tube 3. It is possible to avoid an increase in the diameter.

In addition, the waterproof cover 4 is actually 700 mm in outer diameter and 600 m in total length in accordance with the recent increase in length of the bridge.
When the inclination angle θ _{1 to} θ ₄ is set to ± 5 °, the deformation of the waterproof cover 4 hardly occurs even with respect to the eccentric amount t of about 50 mm observed in a large bridge when it is set to m. Was.

Next, other embodiments of the present invention will be described with reference to FIGS.

The waterproof cover 4 of the second embodiment shown in FIG. 4 has a straight cylindrical surface M parallel to the axial direction Z of the cylindrical portion at an intermediate portion between both tapered surfaces M _{1 to} M ₄ of the cylindrical portions 4b and 4c at both ends. ₅ is obtained by forming the M _6. These straight cylinder surfaces M ₅ and M ₆
As shown in FIG. 2, when the waterproof cover 4 is fitted to the fixing tube and the cable, the waterproof cover 4 comes into contact with the fixing tube and the cable, thereby enabling more stable mounting of the waterproof cover. In this case, the widths of the tapered surfaces M _{1 to} M _{4 on} both sides of the straight cylindrical surfaces M ₅ and M ₆ are shown in FIG.
It is desirable to set the same as in the case of.

The waterproof cover 4 of the third embodiment shown in FIG. 5 has outer tapered surfaces M ₁ , M ₁ on the inner peripheral surfaces of the cylindrical portions 4b, 4c at both ends.
₄ and straight cylindrical surfaces M ₇ and M ₈ parallel to the axial direction Z of the cylindrical portion. It was confirmed that the waterproof cover 4 of this embodiment can also be attached favorably to the eccentric fixing tube and cable as shown in FIG.

The waterproof cover 4 of the fourth embodiment shown in FIG. 6 has convex curved surfaces M ₉ and M ₁₀ formed by bending the inner peripheral surfaces of the cylindrical portions 4 b and 4 c at both ends in the axial direction Z of the cylindrical portion. . Such curved surfaces M ₉ and M ₁₀ are excellent in compatibility with various eccentricities and relative inclinations of the fixing tube and the cable.

The waterproof cover 4 of the fifth embodiment shown in FIG. 7 corresponds to a combination of the first embodiment of FIG. 1 and the fourth embodiment of FIG. 6, and has an inner periphery of a small-diameter cylindrical portion 4b. the surface and the curved surface M _11, has an inner peripheral surface of the large diameter of the cylindrical portion 4c and both tapered surface M _12, M _13. In this case, it is also possible to make the inner peripheral surface of the small-diameter cylindrical portion a double tapered surface and the inner peripheral surface of the large-diameter cylindrical portion a curved surface, contrary to FIG.

Although each of the above embodiments is suitable for a cable and a fixing pipe in a cable-stayed bridge, the present invention is applicable to a structure other than a cable-stayed bridge such as a bridge or a structure such as a building suspended. The present invention is also applied to a cable stretched over an object and a waterproof cover attached to the fixing tube. In addition, this type of waterproof cover has a tapered surface or a curved bearing surface of the above-described configuration formed only on one inner peripheral surface of the cylindrical portion at both ends depending on the application, and the inner peripheral surface of the other cylindrical portion is straight. The cylindrical surface may be left as it is.

[0026]

According to the present invention, the cable and the fixing tube are eccentric when the cylindrical portions at both ends of the waterproof cover are fitted to the cable and the fixing tube for protecting the cable covering the base end thereof and tightened. Since the seat surface formed on the inner peripheral surface of the cylindrical portion at a predetermined angle with respect to the axial direction of the cylindrical portion comes into contact with the eccentric cable or the fixing tube to suppress deformation of the main body of the waterproof cover, the waterproof cover is always attached. It becomes simple and the waterproof cover can be attached with a good appearance. Further, since it is only necessary to change the shape of the inner peripheral surface of the cylindrical portion of the waterproof cover, it is possible to avoid an increase in the diameter of the main body, and to provide a waterproof cover for cables which is advantageous in appearance and cost.

[Brief description of the drawings]

FIG. 1 is a side view including a cross section of a waterproof cover according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view when the waterproof cover of FIG. 1 is attached to a cable and a fixing tube.

FIG. 3 is a cross-sectional view when the waterproof cover of FIG. 1 is attached to an eccentric cable and a fixing tube.

FIG. 4 is a half sectional view of a waterproof cover according to a second embodiment of the present invention.

FIG. 5 is a half sectional view of a waterproof cover according to a third embodiment of the present invention.

FIG. 6 is a half sectional view of a waterproof cover showing a fourth embodiment of the present invention.

FIG. 7 is a half sectional view of a waterproof cover according to a fifth embodiment of the present invention.

FIG. 8 is a partial front view schematically showing a bridge using a cable.

FIG. 9 is a sectional view when a conventional waterproof cover for a cable is attached.

FIG. 10 is a sectional view taken along the line AA of FIG. 9;

FIG. 11 is a cross-sectional view of the waterproof cover of FIG. 9 when it is improperly mounted.

FIG. 12 is a cross-sectional view when another conventional waterproof cover for a cable is attached.

13 is a cross-sectional view of the waterproof cover of FIG.

[Explanation of symbols]

2 cable 3 cable protection fixing tube 4 waterproof cover 4a body portion 4b tubular portion 4c tubular portion M seat surface M ₁ ~M ₄ tapered surface M _9, M ₁₀ curved

Claims (3)

[Claims] 1. A cable stretched over a structure and partially attached to the outer periphery of a tubular cable protection fixing tube externally fitted to a base end of the cable on the structure side. In a waterproof cover made of an elastic material having a substantially conical cylindrical main body part having a cylindrical part integrally formed at both ends, at least one inner peripheral surface of the cylindrical part at both ends of the main body part extends in the axial direction from halfway in the axial direction of the cylindrical part. A waterproof cover for cables, having a seat surface whose angle with respect to the angle changes continuously or stepwise. 2. The cable waterproof cover according to claim 1, wherein the seat surface includes a tapered surface inclined with respect to the axial direction of the cylindrical portion. 3. The cable waterproof cover according to claim 1, wherein the seat surface includes a curved surface bent in the axial direction of the cylindrical portion.