KR101974516B1 - Cable fixing apparatus using ball joint cardan and wedge fixing part, and construction method for the same - Google Patents

Abstract

The present invention relates to a cable mounting apparatus using a ball joint cardan, which is a separable saddle installed on a tower of a cable-stayed girder bridge or an extradosed bridge, which is able to individually disperse and insert cable strands into a circular steel pipe, to remove compressed stress and fretting fatigue in between the strands inside the separable saddle, to remarkably reduce and disperse a stress concentration inducing a hazardous crack on the tower, to place taper-shaped strand insertion units on the ball joint, to conveniently install cable strands, to be assembled with a cardan base, connection nut, ball joint cardan, and wedge mounting unit, to make it convenient to insert the cable strands, to increase a work efficiency, to remove only some of the cable strands installed on the wedge mounting unit from among a plurality of cable strands coated with a polyethylene (PE) sheath, and to prevent a corrosion resistance from decreasing.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cable fixing device using a ball joint cylinder and a wedge fixture,

The present invention relates to a cable fixing device, and more particularly, to a ball joint cardan in a separated saddle installed on a pylon of a cable-stayed bridge or an extensional dojo bridge, A cable fixing device using a ball joint cylinder and a wedge fixture, which can eliminate the compressive stress and fretting fatigue phenomenon between strands in a split saddle by dispersively inserting cable strands individually into a round steel pipe, and a construction method thereof .

Generally, cable bridges such as cable-stayed bridges and extradosed bridges (ED bridges) are known as bridges installed on main roads or railroad tracks. Such a cable-stayed bridge or an extra dosing bridge is configured to support a mold by a plurality of cables extending obliquely from a pylon vertically disposed on a girder or bridge roof.

A saddle structure is used in the pylon of such a cable-stayed bridge or an extrados bridge. Such a saddle structure is configured to support a middle portion of a cable to which both ends are fixed to a mold or a bridge top plate at a pillar portion. For example, a saddle structure using a multi cable is known.

Fig. 1 is a photograph illustrating a typical ED cable-stayed bridge. Fig. 1 (a) shows an ED cable-stayed bridge, and Fig. 1 (b) is a view showing a saddle position installed on a pylon of an ED cable-

As shown in Fig. 1 (a), the ED bridge is a new type of bridge type that combines the advantages of girder bridges and cable-stayed bridges. It can be lighter and more compact than general PSC girder bridges, Because it is small and the height of the main tower can be lowered, the construction and economical efficiency are superior to the cable-stayed bridges in the span of 250 ~ 400m. These ED bridge cable systems include cables, saddles, and fixtures. At this time, there are two types of ED bridge: the type with birds and the type without birds

2 is a diagram showing a configuration of a general ED bridge cable system.

2, a typical ED bridge cable system includes a main tower 11, saddles 12, an anti-slip device 13, a cable 14, a fixture 150 and a bridge top 16.

The ED bridge saddle 12 serves to transmit the static load and the repeated load transmitted from the cable 14 to the main tower 11 and is connected to the unbalanced cyclic load on both sides of the main tower 11, In order to prevent slippage of the cable 14 caused by the slip prevention of the cable. In accordance with the slip prevention type of such a cable, there are integral birds and strand detached birds. In particular, these detachable saddles are intended to disperse the compressive stresses between the cable strands and the stresses that lead to the main tower concrete cracks.

Specifically, cable-stayed bridges or ED bridges were constructed by setting the curved tube-shaped birds at the top of the pylon (above the main pylon) before casting the concrete, installing the pylon by placing the top- Both ends of the cable passing through the saddle are installed so as to be tensioned at a fixing stage provided on a girder or a bridge top plate disposed under the main tower.

That is, a cable bridge is constructed in the saddle through a cable so as to be led out to the opposite outlet portion of the main tower, and both ends of the cable penetrate through the bridge top plate, .

3 is a diagram illustrating the installation of birds according to the prior art.

As shown in Figs. 3 (a) and 3 (b), the outer tube 21 is arranged in a curved shape inside the main tower. The outer tube 21 is open at the opposite outer side of the main tower, One inner tube 22 is inserted.

At this time, a plurality of cables 23 are disposed in the one inner pipe 22. The grouting material 24 is filled in the inner pipe 22 and each of the cables 23 is attached to each other by the grouting material 24 so that the horizontal force acting by the friction between the grouting material 24 and the cable 23 Lt; / RTI > The cable 23 constitutes a twisted core material, which is epoxy-coated.

In particular, the saddle installation must be able to withstand horizontal forces acting in the absence of deformation of the cable, be installed in a protective structure by rusting, and ensure resistance to fatigue by fretting. And the cable must be easily replaceable.

However, due to the defects such as cracking in the hardened grouting material filled with the horizontal resistance, the cable performance may be deteriorated and the cable may be defective. The defective cable must be replaced do.

That is, the saddle according to the conventional technique using the outer tube 21 and the inner tube 22 can not replace only the defective cable strand, and all of the cables must be replaced.

In the case of the separated saddle described above, the cable strand is dispersedly inserted into the individual steel pipe, thereby eliminating the compressive stress and fretting fatigue phenomenon between the strands in the saddle and significantly reducing the stress concentration phenomenon inducing harmful cracks in the main tower, . For example, such detached birds include round steel pipe mortar-type saddles, round steel pipe key tape saddles, and V-type steel pipe saddles.

However, in the case of round tubular mortar-type saddles, it is difficult to confirm the corrosion prevention of the cable strand in the saddle section of the inner pillar of the main tower where the PE coating layer is removed, and there is a disadvantage that the cable strand can not be individually replaced. In addition, in the case of circular steel pipe key tape saddles, there is a disadvantage in that the cable is subjected to only 50% of the cable strands due to the structure in which the key is cross mounted before and after the main tower, thereby increasing the cable rated tension and the number of strands. Further, in the case of the V-shaped steel pipe saddle, since the strand is tightly fixed to the V-shaped steel pipe, there is a disadvantage in that fatigue damage phenomenon may occur due to stress concentration due to the structural lack of space for rotating the saddle and cable fixing part when the installation error occurs , It is also difficult to confirm the corrosion prevention of the portion of the cable strand where the PE coating is removed and the manufacturing cost of the V-shaped steel pipe is higher than that of the existing round steel pipe.

Accordingly, there is a need for a separate saddle and cable fixing device capable of reducing the stress concentration phenomenon and cable fatigue phenomenon caused by the installation error at the time of cable system construction and the bridge dynamic adaptation, and extending the life of the cable.

Korean Patent No. 10-1150352 filed on Mar. 24, 2010, entitled " Saddle Structure and Tension Cable " Japanese Laid-Open Patent No. 2011-162942 (published on Aug. 25, 2011), entitled " Saddle structure and tension cable " Korean Patent No. 10-1873363 filed on Apr. 26, 2018, entitled " Cable damper with magnetic field hydraulic damper of symmetrical hydraulic line and cable vibration control method using same " Japanese Patent No. 4,728,262 filed on January 15, 2007, entitled " Saddle Structure " Japanese Patent No. 4,663,563 (filed March 22, 2006), entitled " Saddle Structure for Bridges " Korean Patent Publication No. 2014-146838 (published on December 29, 2014), entitled " Saddle for bridge pylon and method for fixing cable using the same "

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a cable- Which is capable of eliminating the compressive stress and the fretting fatigue phenomenon between the strands in the split saddle by dispersing and inserting them into the round steel pipe, and dispersing the stress concentration phenomenon that induces harmful cracks in the main tower, A cable fixing device using a cardan and a wedge fixture, and a construction method thereof.

Another object of the present invention is to provide a cable fixing apparatus using a ball joint cylinder and a wedge fixture, which can easily install a cable strand by providing a tether- .

Another object of the present invention is to provide a ball joint and a wedge capable of preventing corrosion resistance performance from being reduced by removing only a part of a cable strand installed in a wedge fixture out of a plurality of cable strands coated with a polyethylene (PE) And a cable fixing device using the fixing member, and a method of constructing the same.

As a means for achieving the above-mentioned technical object, a cable fixing apparatus using a ball joint cylinder and a wedge fixing port according to the present invention is a separable bird which a plurality of cable strands are individually dispersed and inserted, Separated steel tube saddles arranged to penetrate both sides of the main tower of the tower; A cardan base, one side of which is fastened to the separable steel pipe saddle end portion and the other end is threaded; Wherein the cardan bottom housing is connected to the lower housing of the cardan and the ball joint is installed between the lower housing and the upper housing of the cardan so that the cardan bottom housing, Ball joint carton; A connection nut installed for expansion joint connection between the cardan base and the lower housing of the cardan of the ball joint carton; A wedge fixation port comprising a wedge fixation plate, a wedge, a wedge fixation spring, and a wedge compression bolt, the wedge being inserted into a housing upper housing of the ball joint carton to fix a plurality of cable strands, And a plate fixing bolt fastened and fixed to a through hole formed in each of the upper housing, the upper housing, and the lower housing, wherein the detachable steel pipe saddle has a compressive stress between the plurality of cable strands, And a plurality of cable strands are dispersedly inserted in the round steel pipe so as to disperse the stress inducing the wire.

The cable fixing device using the ball joint cartridges and the wedge fixing ports according to the present invention is characterized in that the cable strands are normally installed in the wedge fixing ports and are provided in the stop bolt fastening holes formed in the threaded portions of the coupling nut and the cardan base, And may further include a stop bolt to be fastened.

Here, the stop bolt is temporarily removed for individual replacement of the cable strand, and the cable strand can be individually replaced in a state in which the connection nut is rotated as much as possible to release the tension of the wedge fixture.

Here, the ball joint cart includes a lower end housing having a plurality of through holes for fastening the plate fastening bolts and connected to the card bases by the connecting nuts; A plurality of through holes for fastening the plate fixing bolts are formed. A cartridge upper housing coupled to the lower housing by fastening the plate fastening bolts; And a tether-shaped strand insertion port, and a ball joint inserted and integrated between the lower housing of the cardan and the upper housing of the cardan.

Here, the wedge fixation port includes a wedge fixing plate for fixing the wedge; A wedge inserted into the ball joint having the tapered strand insertion port formed therein to fix each of the cable strands; A wedge fixing spring coupled to an end of the wedge so as to open the wedge at a predetermined angle; And a wedge urging bolt for urging the wedge so that the cable strand is fixed, wherein the wedge is inserted into the ball joint at a predetermined angle by the wedge fixing spring at the time of individual insertion of the cable strand on the opposite side of the wedge fixing port, Is inserted into the strand insertion port of the second connector.

Here, it is preferable that the frictional force is increased by coating the inside of the round steel pipe of the separate steel tube saddle or the surface of the cable strand with a friction material.

Here, the cable strands may each have a polyethylene (PE) coating layer formed thereon, and may be fixed with the PE covering layer of the cable strands removed only at the wedge fixation port so as to prevent a decrease in corrosion resistance of the cable strands.

In another aspect of the present invention, there is provided a method of installing a cable fixing device using a ball joint cylinder and a wedge fixture according to the present invention, comprising the steps of: a) Disposing separate steel tube sills in the form of circular steel tubes and installing a plurality of cable strands through the round steel tubes of the separate steel tube saddles; b) engaging a cardan base on the end of the separable steel tube saddle and disposing a ball joint cartridge in which the ball joint is inserted between the lower housing of the cardan and the upper housing of the cartridge, on the other side of the cardan base; c) installing a connection nut for expansion joint between the cardan base and the ball joint carton; d) introducing the cable strand into the strand insertion port formed in the ball joint of the ball joint carte, respectively; f) fixing the wedge pressing bolt of the wedge fixing port to press the wedge, and applying a tension force to each of the cable strands; ; And g) fastening a stop bolt to a stop bolt fastening hole formed in the threaded portion of the coupling nut and the cardan base, respectively, so that the cable strand is normally installed in the wedge fixture so as to retain a tension force, Is characterized in that a plurality of cable strands are dispersedly inserted in a circular steel pipe so as to disperse compressive stress between the plurality of cable strands and stress inducing cracks of the main tower concrete.

Here, the stop bolt in step g) is temporarily removed for individual replacement of the cable strand, and the cable strand can be individually replaced in a state in which the tension of the wedge fixture is released by rotating the connection nut as much as possible.

According to the present invention, as separate saddles to be installed on a pylon of a cable-stayed bridge or an extensional dojo bridge, cable strands are individually dispersedly inserted into circular steel pipes to eliminate compressive stresses and fretting fatigue phenomena between the strands in the split- And the stress concentration phenomenon that induces harmful cracks in the pylon can be significantly reduced and dispersed. That is, since the cable is not subjected to shear stress, fatigue damage of the cable can be prevented.

According to the present invention, a cable strand can be easily installed by providing a tapered strand insertion hole in a ball joint, and assembled with a cardan base, a connecting nut, a ball joint carton, and a wedge fixture structure, Insertion work is convenient and work efficiency can be improved.

According to the present invention, it is possible to prevent the corrosion resistance performance from being reduced by removing only a part of the cable strands installed in the wedge fixture out of the plurality of cable strands covered with the polyethylene (PE) sheath.

1 is a photograph illustrating a typical ED cable-stayed bridge.
2 is a diagram showing a configuration of a general ED bridge cable system.
Figure 3 is a diagram illustrating the installation of birds according to the prior art.
FIG. 4 is an exploded view of a cable fixing device using a ball joint cylinder and a wedge fixture according to an embodiment of the present invention.
FIG. 5 is a view illustrating a separate steel pipe saddle, a ball joint cart, and a wedge fixture of a cable fixing device using a ball joint cylinder and a wedge fixing port according to an embodiment of the present invention, respectively.
FIG. 6 is a perspective view illustrating a ball joint cartridge fastened to a cardan base in a cable fixing device using a ball joint cylinder and a wedge fixture according to an embodiment of the present invention. FIG.
FIGS. 7A through 7C are cross-sectional views illustrating that a ball joint cylinder is fastened to a cardan base by a connecting nut in a cable fixing apparatus using a ball joint cylinder and a wedge fixing unit according to an embodiment of the present invention.
8 is a side cross-sectional view illustrating the coupling of a ball joint cylinder and a wedge fixture in a cable fixation apparatus using a ball joint cylinder and a wedge fixation port according to an embodiment of the present invention.
FIG. 9 is a front view showing that a ball joint cylinder and a wedge fixture are combined in a cable fixing apparatus using a ball joint cylinder and a wedge fixing unit according to an embodiment of the present invention.
10 is a cross-sectional view showing the CC line shown in Fig.
11 is a diagram specifically showing the D area shown in Fig.
12 is a flowchart illustrating an operation method of a cable fixing apparatus using a ball joint cylinder and a wedge fixture according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as " comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

[Cable fixing apparatus (100) using ball joint cartridges and wedge fixtures)

FIG. 4 is an exploded perspective view of a cable fixing device using a ball joint cylinder and a wedge fixing device according to an embodiment of the present invention. FIG. 5 is a perspective view of a cable fixing device using a ball joint cylinder and a wedge fixing device according to an embodiment of the present invention. Steel tube saddles, ball joint cartridges, and wedge anchorage respectively.

4 and 5, a cable fixing apparatus 100 using a ball joint cylinder and a wedge fixing unit according to an embodiment of the present invention includes a detachable steel pipe saddle 110, a cardan base 120, A wedge fixture 140, a plate fixation bolt 150, a stop bolt 160, and a connection nut 170. As shown in FIG.

Separated steel tube saddles 110 are for dispersing the compressive stresses between the cable strands 210 and the main tower compressive stresses and the stresses that lead to the main tower concrete cracks. As shown, the plurality of cable strands 210 are separate split saddles that are individually dispersedly inserted and are arranged to pass through both sides of the pylon of a cable-stayed bridge or an Extradosed bridge (ED Bridge). At this time, the separable steel pipe saddle 110 dispersively inserts a plurality of cable strands 210 in the circular steel pipe so as to disperse the compressive stress between the plurality of cable strands 210 and the stress that induces cracks in the main tower concrete. In addition, it is preferable that the frictional force is increased by coating a friction material inside the circular steel pipe of the separable steel pipe saddle 110 or the surface of the cable strand.

One end of the cardan base 120 is fastened to the end of the separable steel pipe saddle 110 and the other end is threaded 121. As shown in FIG 6, A hole 122 is formed.

The ball joint cartridge 130 includes a lower cartridge housing 131, a cartridge upper housing 132 and a ball joint 133. The cartridge lower housing 131 is provided with a cartridge base And a ball joint 133 is installed between the lower cartridge housing 131 and the cartridge upper housing 132 to be integrated.

5B, a plurality of through-holes for fastening the plate fixing bolt 150 are formed in the lower end of the cartridge bottom housing 131 of the ball joint cartridge 130, And is connected to the cardan base 120 by the connecting nut 170. In addition, a plurality of through holes for fastening the plate fixing bolt 150 are formed in the cartridge upper housing 132 of the ball joint cartridge 130. And is engaged with the lower housing 131 by fastening the plate fixing bolt 150. The ball joint 133 of the ball joint cartridge 130 is formed with a tapered strand insertion opening 211. The ball joint 133 includes a lower end of the cardion lower housing 131 and a lower end of the cardion upper end housing 132, And are integrated.

A connection nut 170 is provided for expansion joint connection between the cardan base 120 and the lower end of the cardan bottom housing 131 of the ball joint cartridge 130.

The wedge fixture 140 comprises a wedge fixture plate 141, a wedge 142, a wedge fixation spring 143 and a wedge compression bolt 144, And the plurality of cable strands 210 are fixed to each other. In this case, the cable strands 210 are each formed of a polyethylene (PE) covering layer, and the PE strands 210 of the cable strand 210 are formed only in the wedge fixture 140 so as to prevent the corrosion resistance of the cable strands 210 from being reduced. It is preferable to fix it in a state in which it is removed.

5C, the wedge fixing plate 141 of the wedge fixing port 140 is formed with a through hole to fix the wedge 142 to the ball joint cartridge 130 . The wedge 142 of the wedge fixture 140 is inserted into the ball joint 133 formed with the tapered strand insertion hole 211 to fix each of the cable strands 210. The wedge fixing spring 143 of the wedge fixing unit 140 is coupled to the end of the wedge 142 so that the wedge 142 can be opened at a predetermined angle. In addition, the wedge urging bolts 144 of the wedge fixture 140 each press the wedge 142 so that the cable strand 210 is fixed. The wedge 142 is wound on the opposite side of the wedge fixture 140 from the strand 133 of the ball joint 133 in a state in which the cable strand 210 is opened at a predetermined angle by the wedge- And can be inserted into the insertion port 211.

The plate fixing bolts 150 are fastened and fixed to the through holes formed in the wedge fixing plate 141 of the wedge fixing port 140, the housing upper housing 132 and the housing lower housing 131, respectively.

The stop bolts 160 are positioned between the connecting nut 170 and the threads 121 of the cardan base 120 so that the cable strands 210 are normally installed in the wedge fixture 140 to retain the tension, And is fastened to the bolt fastening hole 122. The stop bolts 160 are temporarily removed for individual replacement of the cable strands 210. The stop bolts 160 are rotated to a maximum extent to release the tension of the wedge fixation holes 140, The strands 210 can be individually replaced.

In other words, the shape of the saddle using the existing wedge is assembled in the slip prevention apparatus without installing the wedge at the work site, and it is also difficult to replace the individual strands, but the ball joint cylinder and the wedge fastener The wedge 142 can be pushed into the fixing position of the wedge fixing hole 140 by simply tightening the wedge pressing bolt 144 after the cable strand 210 is inserted and tensed Therefore, the cable can be easily installed. In addition, by using the connecting nut 170 so that expansion joint can be performed, the slip prevention device can easily replace the individual strands during use and the individual strands during use of the bridge.

FIG. 6 is a perspective view showing a ball joint cartridge fastened to a cardan base in a cable fixing device using a ball joint cylinder and a wedge fixing port according to an embodiment of the present invention, and FIGS. 7a to 7c are perspective views, Figs. 7A and 7B are cross-sectional views showing the AA line shown in Fig. 6 as the sectioning, and Fig. 7C is a detailed view of the area B shown in Fig. 7A .

As shown in FIG. 6, the ball joint cartridges 130 can be fastened to the cardan base 120 in the cable fixing apparatus 100 using the ball joint cartridges and the wedge fixing ports according to the embodiment of the present invention, At this time, a connection nut 170 capable of expansion and contraction is installed between the cardan base 120 and the cartridge lower casing 131 of the ball joint cartridge 130.

FIG. 7A is a cross-sectional view taken along the line A-A shown in FIG. 6, and shows a state in which the cable bottom and the fixture are in a state where the cable and the fixture are in a normal installation state and a tension holding state, respectively. 7B is a cross-sectional view taken along the line AA shown in Fig. 6, in which the stop bolt 160 is removed to replace the individual cable strand 210, and the connection nut 170 is rotated as much as possible, And shows a state in which the tension of the fixing port 140 is released. 7C shows the region B shown in Fig. 7A in more detail, and shows that the stop bolt 160 is fastened and fixed to the thread of the cardan base 120. Fig. Here, reference numeral 134 denotes a free rotation joint.

FIG. 8 is a side cross-sectional view illustrating a ball joint cylinder and a wedge fixture engaged in a cable fixing apparatus using a ball joint cylinder and a wedge fixing unit according to an embodiment of the present invention.

8, in a cable fixing apparatus 100 using a ball joint cylinder and a wedge fixing port according to an embodiment of the present invention, a tapered strand insertion hole (not shown) formed in a ball joint 133 of a ball joint cartridge 130, The cable strand 210 can be inserted through the wedge fixing portion 211 and the wedge 142 of the wedge fixing portion 140 inserted therein to fix the cable strand 210. [ At this time, by providing a tapered strand insertion hole 211 in the ball joint 133, the cable strand 210 can be easily installed.

In addition, in the ED gratings according to the related art, when the wedge is used, the length of the cable strand 210 installed in the saddle section is very short. Therefore, when the cable strand 210 needs to be replaced If the wedge is released by forcibly tensioning without providing the expansion and contraction, excessive stress may be applied to the tower concrete, which may cause a great damage. In contrast, the ball joint cartridges 130 according to the embodiment of the present invention and the connecting nuts 170 enabling the expansion and contraction can be additionally connected between the cardan bases 120. The stop bolt 160 for fixing the connection nut 170 is released and the connection nut 170 is screwed to the thread 121 exposed on the threaded portion of the cardan base 120 with a special tool, The tensioned wedge 142 and the cable strand 210 can be easily released by loosening them.

9 is a front view showing that a ball joint cylinder and a wedge fixture are combined in a cable fixing apparatus using a ball joint cylinder and a wedge fixing port according to an embodiment of the present invention, Fig. 11A shows a wedge state before the cable strand is installed, and Fig. 11B shows a state in which the wedge after the cable strand tension State.

As shown in Fig. 11A, the wedge 142 of the wedge fixation port 140 is assembled with the wedge fixing spring 143 in a state open at an angle. That is, as shown in FIG. 10, the wedge 142 is brought into a state in which the wedge 142 is opened at a predetermined angle by the wedge fixing spring 143 so that the wedge 142 can be inserted without any trouble during insertion from the opposite side of the cable strand 210.

Accordingly, according to the embodiment of the present invention, it is possible to disperse and insert the cable strands individually into the round steel pipe to eliminate the compressive stress and the fretting fatigue phenomenon between the strands in the split saddle, The stress concentration phenomenon that induces cracks can be remarkably reduced and dispersed.

[Construction method of cable fixing device using ball joint cylinder and wedge fixture]

12 is a flowchart illustrating an operation method of a cable fixing apparatus using a ball joint cylinder and a wedge fixture according to an embodiment of the present invention.

12, a method of constructing a cable fixing device using a ball joint cylinder and a wedge fixture according to an embodiment of the present invention includes the steps of: firstly, attaching a circular steel pipe to a tower top of an extradosed bridge (ED bridge) A plurality of cable strands 210 are installed so as to penetrate the circular steel pipe of the separable steel pipe saddle 110 at step S110. At this time, the separable steel pipe saddle 110 can dispersively insert a plurality of cable strands 210 in the circular steel pipe so as to disperse the compressive stress between the plurality of cable strands 210 and the stress that induces cracks in the main tower concrete have.

Next, a cardan base 120 is fastened to the end of the separable steel pipe saddle 110, and a ball joint 133 is inserted between the cardan lower housing 131 and the cardan upper housing 132, The cardan 130 is disposed on the other side of the cardan base 120 (S120). The ball joint 133 of the ball joint cartridge 130 is formed with a tapered strand insertion hole 211 for installing the cable strand 210.

Next, a connection nut 170 is installed for expansion and contraction between the cardan base 120 and the ball joint cartridges 130 (S130).

Next, the cable strands 210 are respectively introduced into the strand insertion holes 211 formed in the ball joint 133 of the ball joint cart 130 (S140).

Next, in a state where the wedge 142 of the wedge fixation hole 140 is open, the cable strand 210 entering the strand insertion hole 211 is passed through and is fixed (S150). The wedge 142 is inserted into the strand insertion opening (not shown) of the ball joint 133 in a state in which the wedge 142 is opened at a predetermined angle by the wedge fixing spring 143 when the cable strand 210 is inserted separately from the wedge fixing port 140 211).

Next, the wedge urging bolts 144 of the wedge fixing port 140 are tightened to press the wedge 142, and tension is applied to each of the cable strands 210 (S160).

Next, the cable strand 210 is normally installed in the wedge fixation hole 140 and is inserted into the stop bolt fastening hole 140 formed in the coupling nut 170 and the thread 121 of the cardboard base 120, The stop bolt 160 is fastened to the stopper 122 (S170). The stop bolts 160 are temporarily removed for individual replacement of the cable strands 210 and the tension of the wedge fixation hole 140 is released by rotating the connection nut 170 as much as possible, The strands 210 can be individually replaced.

In addition, the cable strands 210 are each formed of a polyethylene (PE) covering layer, and the PE covering layer 210 of the cable strand 210 is formed only at the wedge fixing port 140 to prevent the corrosion resistance performance of the cable strand 210 from being reduced. Can be fixed in a state of being removed. At this time, it is preferable that the frictional force is increased by coating a friction material inside the circular steel pipe of the separable steel pipe saddle 110 or the surface of the cable strand.

As a result, according to the embodiment of the present invention, only a part of the cable strand 210 installed in the wedge fixture 150 among the plurality of cable strands 210 covered with the polyethylene (PE) sheath is removed, . At this time, since the cable is not subjected to the shearing stress, fatigue damage of the cable can be prevented. As described above, by assembling the cardboard base 120, the connecting nut 170, the ball joint card 130, and the wedge anchor 140, it is possible to easily insert the cable strand 210, Efficiency can be increased.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Cable fixing device using ball joint cylinder and wedge fixture
110: Separated Steel Pipe Saddle 120: Cardan Base
130: ball joint cardan 140: wedge anchor
150: Plate fixing bolt 160: Stop bolt:
170: Connecting nut
121: thread 122: stop bolt fastening hole
131: Cardan lower housing 132: Cardan upper housing
133: ball joint
141: Wedge fixing plate 142: Wedge
143: wedge fixing spring 144: wedge pressing bolt
210: cable strand 211: strand insertion hole

Claims (10)

Detachable steel saddle (110) arranged to penetrate both sides of a pylon of a cable-stayed bridge or an extradosed bridge (ED bridge), wherein the plurality of cable strands (210) are individually dispersedly inserted;
A cardan base 120 having one side fastened to the end of the separable steel pipe saddle 110 and the other side threaded 121;
A cardan bottom housing 131, a cardan upper housing 132 and a ball joint 133. The cardan base 120 is connected to the cardan lower housing 131, A ball joint cartridge (130) integrally formed with a lower housing (131) and a ball joint (133) installed between the cartridge upper housing (132);
A connection nut 170 installed to connect the cardan base 120 and the ball joint cartridge 130 between the lower housing 131 of the cartridge and the expansion joint;
A wedge fixing plate 141, a wedge 142, a wedge fixing spring 143 and a wedge pressing bolt 144. The wedge 142 is connected to the cardan upper housing (not shown) of the ball joint cartridge 130 A wedge fixture 140 inserted into the plurality of cable strands 132 to fix the plurality of cable strands 210, respectively; And
And a plate fixing bolt 150 fastened and fixed to a through hole formed in the wedge fixing plate 141 of the wedge fixing unit 140, the housing upper housing 132 and the housing lower housing 131, respectively, ,
The separable steel pipe saddle 110 dispersively inserts a plurality of cable strands 210 in a circular steel pipe so as to disperse compressive stress between the plurality of cable strands 210 and stress inducing cracks of the main tower concrete,
The ball joint cartridge 130 has a plurality of through holes for fastening the plate fixing bolt 150 and is connected to the cardan base 120 by the connecting nut 170. [ (131); A cardan upper housing 132 formed with a plurality of through holes for fastening the plate fixing bolt 150 and engaged with the lower housing 131 by fastening the plate fixing bolt 150; And a ball joint 133 which is inserted and integrated between the lower end of the cardan housing 131 and the upper end of the cardan housing 132, Cable fixing device using cardan and wedge fixture. The method according to claim 1,
A stop bolt fastening hole 122 formed in the coupling nut 170 and the thread 121 of the cardan base 120 so that the cable strand 210 is normally installed in the wedge fixing hole 140 and retains a tension force, And further comprising a stop bolt (160) fastened to the fastening member (160). 3. The method of claim 2,
The stop bolt 160 is temporarily removed for individual replacement of the cable strand 210 and the cable strand 210 is rotated in a state where the connection nut 170 is rotated to the maximum to release the tension of the wedge fixation hole 140, 210) are individually replaced. The cable fixing device using the ball joint cylinder and the wedge fixture. delete The wedge fixing device according to claim 1, wherein the wedge fixing member (140)
A wedge fixing plate 141 for fixing the wedge 142;
A wedge (142) inserted into a ball joint (133) formed with the tapered strand insertion port (211) to fix each of the cable strands (210);
A wedge fixing spring 143 coupled to an end of the wedge 142 so as to open the wedge 142 at a predetermined angle; And
And a wedge urging bolt (144) for urging the wedge (142) to fix the cable strand (210), respectively,
The wedge 142 is inserted into the strand insertion hole 211 of the ball joint 133 in a state in which the wedge fixing spring 140 is opened at a predetermined angle when the cable strand 210 is inserted separately from the wedge fixing hole 140 Wherein the cable fixing device is inserted into the cable fixing device using a ball joint cylinder and a wedge fixing device. The method according to claim 1,
Wherein a frictional force is increased by coating a friction material inside the round steel pipe of the separable steel pipe saddle (110) or the surface of the cable strand, thereby increasing frictional force. The method according to claim 1,
The cable strands 210 are each formed of a polyethylene (PE) covering layer and the PE covering layer of the cable strand 210 is removed only at the wedge fixing port 140 so as to prevent a decrease in the corrosion resistance performance of the cable strand 210 Wherein the fixation is performed in a state that the wedge fixture is fixed to the ball joint cylinder. a) Separate steel pipe sheds 110 in the form of round steel pipes are disposed at the tower top of the cable-stayed bridge or an extradosed bridge (ED bridge), and a plurality of cable strands (210);
b) The cardanoid base 120 is fastened to the end of the separable steel tube saddle 110 and the ball joint 140 is inserted between the cartridge lower housing 131 and the cartridge upper housing 132, (130) on the other side of the cardan base (120);
c) installing a coupling nut (170) for expansion joint between the cardan base (120) and the ball joint cartridge (130);
d) advancing the cable strand (210) into the strand insertion port (211) formed in the ball joint (133) of the ball joint cartridge (130);
e) passing through the cable strand 210 entering the strand inserting hole 211 in a state where the wedge 142 of the wedge fixation hole 140 is open and fixing the same;
f) tightening the wedge urging bolts (144) of the wedge fixture (140) to urge the wedge (142) and introduce a tension force into each of the cable strands (210); And
g) The cable strand 210 is normally installed in the wedge fixture 140 and is provided with a stop bolt fastening hole (not shown) formed in the connecting nut 170 and the thread 121 of the cardan base 120 122) of the stop bolt (160).
The separable steel pipe saddle 110 dispersively inserts a plurality of cable strands 210 in a circular steel pipe so as to disperse compressive stress between the plurality of cable strands 210 and stress inducing cracks of the main tower concrete,
The ball joint 133 of the ball joint cartridge 130 of the step d) is formed with a tapered strand insertion hole 211 for the installation of the cable strand 210, The wedge 142 is connected to the strand inserting hole 211 of the ball joint 133 in a state where the wedge 142 is opened at a predetermined angle by the wedge fixing spring 143 when the cable strand 210 is inserted separately from the wedge fixing hole 140 The cable strand 210 is formed with a polyethylene coating layer and the cable strand 210 is inserted only in the wedge fixture 140 so as to prevent the corrosion resistance of the cable strand 210 from being reduced. Wherein the PE coating layer of the ball joint cylinder 210 and the PE coating layer of the ball joint cylinder 210 are removed. 9. The method of claim 8,
The stop bolt 160 of the step g) is temporarily removed for individual replacement of the cable strand 210 and the tension of the wedge fixation hole 140 is released by rotating the connection nut 170 as much as possible Wherein the cable strands (210) are individually replaced. ≪ Desc / Clms Page number 20 > delete

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