KR20110111905A

KR20110111905A - Saddle exit sturcture

Info

Publication number: KR20110111905A
Application number: KR1020100031221A
Authority: KR
Inventors: 박경준; 오민호
Original assignee: 케이블텍 주식회사
Priority date: 2010-04-06
Filing date: 2010-04-06
Publication date: 2011-10-12

Abstract

The present invention relates to the structure of the exit portion of the birds in the main column structure such as the cable-stayed bridge, Yangyang Bridge (Extradosed bridge) and the strand used in the structure. In particular, it relates to the saddle outlet structure, which can reduce the limited concentration of the amplitude load of the sand cable to improve the durability of the sand cable.
The present invention, in the saddle outlet structure of the yarn cable, the inner tube disposed in the main tower structure; Sasa cable that penetrates the inside of the inner tube to the outside of the main tower structure; Grout filled between the inner tube and the yarn cable; A slide pipe connected to the inner tube; And a protective tube connected to the slide pipe to protect the yarn cable, wherein the slide pipe has a thickness of a side connecting to the protective tube is thinner than a side connecting to the inner tube. To provide a saddle outlet structure.
In another aspect, the present invention, the one end is connected to the protective tube for protecting the upper yarn cable, the other end is connected to the inner tube of the saddle, the thickness of the one end side is characterized in that the slide pipe is formed thinner than the other end side Provided as a solution to the problem.

Description

Saddle exit structure of sander cable {Saddle Exit Sturcture}

The present invention relates to the structure of the exit portion of the birds in the main column structure such as the cable-stayed bridge, Yangyang Bridge (Extradosed bridge) and the strand used in the structure. In particular, it relates to the outlet structure of the saddle which improves the durability of the sand cable by reducing the limited concentration of the amplitude load of the sand cable.

In general, the saddle portion such as the Yangyanggyo Bridge protects and maintains the center portion of the sander cable in which both ends are fixed to the mold in the pylon structure. An inner tube is disposed inside the exterior embedded in the pylon structure and a plurality of lines of sand cable ( Tension member is penetrated, and grout is filled between the inner tube and the yarn cable.

In the saddle portion, the slide pipe is coupled to the inner pipe near the outlet portion where the sand cable is exposed from the main tower structure, and the protection pipe covering the outer circumferential surface of the sand cable is connected to the slide pipe. In the conventional case, the slide pipes have the same thickness in the longitudinal direction.

The livestock cable, which is stored and maintained by the saddle part, acts as a live load or vibrates due to wind or the like, and thus a flexural load acts. However, in the saddle outlet structure using the conventional slide tube, there exists a problem that the bending rigidity is not optimized.

If the thickness of the steel pipe constituting the slide pipe is too thick, the bending pipe rigidity of the slide pipe becomes too large, which causes problems in durability due to the bending of the protective pipe at the joint of the protective pipe. The bending load is not transmitted smoothly at the end of the inner tube, and according to the magnitude of the bending load, there arises a problem that the axial amplitude load generated in the yarn cable is concentrated locally.

For this reason, the characteristics required for the slide pipe when the bending load acts on the sand cable are as follows. First, in the connection portion between the slide pipe and the protection tube, bending stress should not be concentrated in the protection tube due to the bending of the protection tube, and second, in the connection portion with the saddle inner tube, a structure in which the bending load of the sand cable is transmitted to the inner tube is required.

The problem to be solved by the present invention is to provide a saddle outlet structure of the new cable that is not concentrated bending stress in the protective tube, while the bending load is transmitted to the inner tube smoothly. In addition, it is to provide a slide pipe that can smoothly transfer the bending load to the inner tube without concentrating bending stress in the protective tube.

The present invention achieves the above object by appropriately changing the thickness of the slide pipe in the longitudinal direction thereof.

In the saddle outlet structure of the sander cable,

An inner tube disposed within the pylon structure;

Sasa cable that penetrates the inside of the inner tube to the outside of the main tower structure;

Grout filled between the inner tube and the yarn cable;

A slide pipe connected to the inner tube; And,

It includes a protective tube for connecting the slide pipe to protect the yarn cable,

The slide pipe is provided with a saddle outlet structure of yarn cable, characterized in that the thickness of the side connecting to the protective tube is formed thinner than the side connecting to the inner tube.

In addition, the present invention,

One end is connected to the protective tube protecting the upper yarn cable, and the other end is connected to the inner tube of the birds,

The thickness of the said one end part is formed thinner than the said other end part, The slide pipe provided as a means of solving a subject is provided.

According to the present invention, the thickness of the portion connected to the protective tube in the slide pipe is thinner than the portion connected to the saddle inner tube so that the protective tube is easily bent and the inner tube is hard to be bent, so that the bending load is rigid due to the cantilever effect of the slide pipe. It is transmitted to the inner tube in a greatly reduced state, and the durability of the yarn cable is improved by preventing local concentration of axial amplitude loads caused by bending vibration of the yarn cable.

1 is a schematic diagram of a pylon saddle structure.
2 is a cross-sectional view of an outlet structure of a yarn cable according to an embodiment of the present invention.
3 is a cross-sectional view of a slide pipe according to one embodiment of the present invention.
4 is a view showing a connection portion between a slide pipe and a protective tube.
5A is a cross-sectional view of the spacer.
5B is a longitudinal sectional view of the spacer.
6A is a cross-sectional view of the block plate.
6B is a longitudinal cross-sectional view of the block plate.
7A is a sectional view of the sealing rubber.
7B is a longitudinal sectional view of the sealing rubber.
8A is a cross-sectional view of the pressing plate.
8B is a longitudinal sectional view of the pressing plate.

Hereinafter, embodiments of the present invention will be described with reference to the drawings to provide specific contents for the practice of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS It is partial sectional drawing of the pylon saddle part in the double bridge (Extradosed bridge) to which this invention is applied.

The saddle part embeds an exterior 2 of a high density polyethylene material in the concrete 1 constituting the main tower 100, and a spiral reinforcement 3 is disposed on the outer circumference of the exterior 2, and the exterior ( Inside the 2), the inner tube 4, which is a steel pipe, is inserted. An inner tube spacer 5 is provided between the outer tube 2 and the inner tube 4 to maintain the position of the inner tube 4 in the outer tube 2. A slide pipe (80) is formed at the end of the inner tube (4), and a protective tube (90) is connected to the end of the slide pipe (80).

A plurality of tension members 6 (saber cable) penetrate the inner tube 4. As the tension member, a steel wire coated with an epoxy resin on its surface is preferable. In FIG. 1, only one strand of the tension member 6 is shown, and the rest is omitted.

Both ends of the inner tube (4) are exposed from the concrete (1) of the main tower, the outlet portion is formed with an exponential structure, to prevent the primary grout filling between the inner tube (4) and the tension member (6). . Both ends of the tension member 6 penetrating the main column 100 is not shown in the fixing using a fixing tool to the mold.

2 is an enlarged cross-sectional view of the saddle outlet. The outlet part is provided with the inner pipe 4, the exterior 2, and the slide pipe connected to the end part. The support plate 10 is attached to the outer periphery of the exterior 2. The support plate 10 is comprised from the end part 11 welded to the outer side of the exterior 2, and the plate part 12 provided in the end of the end part 11. As shown in FIG. The plate nut 12 is screwed with a ring nut 7 fastened to the outer circumference of the inner tube 4. An injection pipe 15 of the primary grout is connected to the inner tube 4, and the injection pipe 15 passes through the outer tube 2, passes through the end portion 11 and the plate portion 12, and is drawn out to the outside. have.

In addition, a spacer 20, a block plate 30, an elastic material 50, and a keep plate 60 are sequentially installed at an outlet portion of the inner tube 4 to form an index structure of the primary grout.

The slide pipe 80 is bolted to the surface of the ring nut 7 so as to cover the index structure. Hereinafter, each component will be described in detail individually.

The exterior 2 is a circular pipe embedded in the concrete of the main column, for example, made of polyethylene. The inner tube 4 is a circular pipe arranged in the outer tube 2, for example a steel tube may be used. The inner tube 4 protects the yarn cable 6 at the main column and fills the primary grout therein to prevent corrosion of the yarn cable 6 and at the same time integrates the cable 6. Therefore, the inner grout 4 is provided with an index structure of the primary grout. The inner tube 4 supports the unbalanced loads generated on the left and right sides of the yarn cable 6 by friction.

The slide pipe 80 connects the protection pipe 90 covering the main tower structure and the yarn cable 6 and fills the secondary grout therein, and steel pipe is usually used. An enlarged cross-sectional view of the slide pipe 80 is shown in FIG. 3. As shown in FIG. 3, one end of the slide pipe 80 is provided with a female screw portion 81 for engaging with a protective tube, and the other end is provided with a flange 82 for mounting to the plate portion 12. At this time, the outlet 83 of the secondary grout is formed on the outer circumferential surface of the flange 82 side of the slide pipe 80. Here, the thickness of the female screw part 81 side of the slide pipe 80 is made thinner than the thickness of the flange side. In other words, in adjusting the bending stiffness of the slide pipe 80, the main column is made to be substantially similar to the bending stiffness of the inner tube 4, and lower in the connection portion with the protective tube 90. In this embodiment, the thickness of the thick portion 80A was adjusted to 4.5 mm, and the thickness of the thin portion 80B was adjusted to 3.8 mm.

By varying the thickness of the slide pipe 80 in the longitudinal direction as described above, it is possible to construct a structure in which the bending rigidity of the slide pipe 80 decreases stepwise as it moves away from the main column. It is greatly reduced to the elastic energy by the transfer to the inner tube (4). Moreover, local concentration of the axial amplitude load generated by the bending load of the yarn cable 6 is reduced, and the durability of the yarn cable 6 is improved.

The method of changing the thickness of the slide pipe 80 along the longitudinal direction can be applied both to changing the thickness stepwise and continuously changing the thickness. In the present embodiment, the thickness of the slide pipe 80 is changed in two stages, but may be changed over three or more stages or in succession.

Each dimension of the slide pipe 80 used in the present Example is as follows.

Overall length: 996mm

Outer diameter of thick part: 216.3mm

Outer diameter of thin section: 214.9mm

Flange Diameter: 300mm

Flange Thickness: 6mm

Axial length of female thread: 126mm

The protective tube 90 is a pipe for protecting the yarn cable 6 in the free ledger and filling secondary grout therein. In general, a material such as fiber-reinforced plastic or high density polyethylene is used for the material of the protective tube 90. The secondary grout in the protective tube is injected from the anchorage side of the mold to overflow the grout from the outlet 83 of the slide pipe 80.

As shown in FIG. 4, the male thread corresponding to the female threaded portion 81 of the slide pipe 80 is formed at the end of the protective tube 90. The end of the slide pipe 80 is formed in a tapered state according to the outer diameter of the sign pipe 90.

In the outlet portion of the inner tube 4, a spacer 20 for protecting and holding a plurality of tension members 6 (a yarn cable) at predetermined intervals is inserted. The spacer 20 has a cylindrical shape substantially corresponding to the inner diameter of the inner tube 4, as shown in FIG. 5, and has a through hole 21 provided in the axial direction for each yarn cable 6. Further, at one end of the spacer 20, a fixing portion 22 is formed on the flange and connected to the end of the steel tube to prevent the spacer 20 from entering the inside of the steel tube. The spacer 20 may be a structure which can protect and hold the yarn cable 6 at predetermined intervals, and is preferably made of a material which is hard to wear when the yarn cable 6 is inserted. In this embodiment, the material of the spacer 20 is made of high density polyethylene.

The block plate 30 is disposed outside the spacer 20. As shown in FIG. 6, the block plate 30 is a disk-shaped structure which has the circular part 31 on one end side and the plate-shaped part 32 on the other end side. The plate-shaped portion 32 is formed with the through hole 33 of the yarn cable 6 in the axial direction, and the resin filled hole 34 penetrating in the radial direction is formed in the circular portion 31. Four resin filling holes 34 are provided at positions that divide the outer circumference into approximately four equal parts.

The outer diameter of the block plate 30 is substantially the same as the outer diameter of the inner tube 4 and is constant along the longitudinal direction, but the inner diameter of the circular portion 31 is larger at one end, and gradually decreases through the stepped portion 35 at the center. Consists of. Mounting to the steel pipe end part is performed in the direction in which the circular part 31 opposes the spacer 20. As shown in FIG. By this mounting, the fixing portion 22 of the spacer 20 is inserted into the stepped portion 35 so that the space surrounded by the spacer 20 and the circular portion 31 becomes a resin filling portion. This charging part is filled with resin as mentioned later.

On the other hand, six bolt holes 36 penetrating in the axial direction are formed on the outer circumferential side of the block plate 30. This bolt hole 36 is a hole through which the bolt 70 of the fixing mechanism mentioned later penetrates. In this embodiment, the block plate 30 is made of high density polyethylene.

The elastic member 50 is disposed outside the block plate 30. As shown in Fig. 7, the elastic material 50 is a disk-shaped configuration having a through hole 51 of a yarn cable which is a tension material. The elastic material 50 is sandwiched between the block plate 30 and the keep plate 60, which will be described later, is compressed and deformed, and the elastic material 50 is interposed between the yarn cable 6, which is a tension material, to leak the resin. Suppress It is preferable that the elastic material 50 is made of a material which is easily elastically deformed moderately and hardly wears against the friction when the yarn cable 6 is inserted. In general, chloroprene rubber and urethane rubber are insufficient in terms of wear resistance. In the present Example, the material of the elastic material 50 was made into hanenite (brand name) excellent in the wear resistance at the time of inserting a tension material.

The keep plate 60 is disposed outside the elastic material 50. As shown in FIG. 8, the keep plate 60 also has a disk-shaped configuration having a through hole 61 through which the yarn cable 6 can penetrate. On one side of the keep plate 60, a coupling portion 62 into which the elastic member 50 is inserted is formed.

On the outer circumferential side of the keep plate 60, all six bolt holes 63 penetrating in the axial direction are formed. The bolt hole 63 is a hole through which the bolt 70 of the fixing mechanism described later passes.

In the present Example, the size of the keep plate 60 was 45 mm thick, the outer diameter 160 mm, and the material was made into high density polyethylene.

A tightening mechanism is used to compressively deform the elastic material 50. In this embodiment, the bolt 70 (refer FIG. 2) which penetrates the keep plate 60 and the block plate 30 one by one and is fastened to the opening end surface of the inner tube 4 is used. That is, the block plate 30 penetrates the bolts 70 through the bolt holes 36 and 63 of the keep plate 60, and by tightening the bolts 70, the keep plate 60 is pressed toward the spacer side. , Exerts a compressive force between the block plate 30. The elastic material 50 is deformed by this compressive force to close the yarn cable 6 with the elastic material 50.

The fast-acting thing which hardens resin which fills a resin filling part in a short time is preferable. Filling of the resin reliably prevents leakage of grout from the block plate 30. The resin has a moderate viscosity such that the gap between the sand cable 6 and the spacer 20 and the gap between the block plate 30 and the sand cable 6 are quickly filled and cannot easily flow out. Is preferred. In the present Example, 5090 Pa.s epoxy resin was used about 25 degreeC of viscosity.

Hereinafter, a method of assembling the exponential structure will be described.

After the insertion of the transfer material cable into the steel pipe, the spacer 20, the block plate 30, the elastic material 50, the keep plate 60 is slid to draw near the saddle side. This attraction can be performed by the attraction force, but if it is difficult to slide by the attraction force, a lever block may be used. For example, by arranging an annular drawing jig (not shown) on the outside of the keep plate 60, and connecting the lever jig with a lever block between the drawing jig and the ring nut 7, and operating the lever block. The spacer 20, the block plate 30, the elastic material 50 and the keep plate 60 slide on the ruling nut side.

The spacer 20 is inserted into the steel pipe. If it is difficult to insert, it is good to lift the yarn cable 6 slightly.

In addition, the block plate 30, the elastic material 50, and the keep plate 60 are arranged in contact with each other outside the spacer 20.

The bolt 70 is inserted into the bolt holes 63 and 36 of the keep plate 60 and the block plate 30, and the tip of the bolt 70 is fastened to the end surface of the inner tube 4 to fasten the keep plate 60. Tighten tightly. By inserting a spring washer or flat washer in the bolt head portion, the bolt head portion is to dig into the keep plate (60) to sufficiently apply pressure. By this pressure, it compresses until the thickness of the elastic material 50 becomes about half thickness. The compressed elastic material 50 deforms to spread widely, and closes the yarn cable 6 with the elastic material 50.

The jack is attached to the yarn cable 6 and tensioned to a predetermined pressure.

Resin is injected through the resin filling hole 34 of the block plate 30. At this time, resin is injected from the resin filling hole located at the bottom among the four resin filling holes 34, and the resin is overflowed sufficiently in the remaining three resin filling holes to sufficiently fill the resin. By this operation, resin is filled in the space enclosed by the block plate 30 and the spacer 20 and a gap between the block plate 30 and the yarn cable 6.

After curing of the resin (after about 24 hours after injection), grout is injected and filled into the saddle steel pipe from the injection pipe 15.

Inject grout into the steel pipe. This injection is performed through the injection pipe 15 exposed from the support plate 10. This grout injection prevents the yarn cable 6 from sliding in the saddle.

1: concrete 2: appearance
4: inner tube 6: yarn cable
10: support plate 20: spacer
30: block plate 50: elastic material
60: keep plate 80: slide pipe
90: sheriff

Claims

In the saddle outlet structure of the sander cable,
An inner tube disposed within the pylon structure;
Sasa cable that penetrates the inside of the inner tube to the outside of the main tower structure;
Grout filled between the inner tube and the yarn cable;
A slide pipe connected to the inner tube; And,
It includes a protective tube for connecting the slide pipe to protect the yarn cable,
The slide pipe is saddle outlet structure of the yarn cable, characterized in that the thickness of the side connecting to the protective tube is formed thinner than the side connecting to the inner tube.

One end is connected to the protective tube protecting the upper yarn cable, and the other end is connected to the inner tube of the birds,
A slide pipe, characterized in that the thickness of the one end is formed thinner than the other end.