KR102013736B1 - Cable fixing apparatus for cable bridge using ball joint cardan, and cable strand replacement method therewith - Google Patents

Abstract

The present invention relates to a cable fixing apparatus using a ball joint cardan, and a cable strand replacement method using the same, wherein a ball joint cardan is installed in a separable type saddle installed in a main tower of a cable-stayed bridge or an extradosed bridge, and a cable strand is individually fixated through a wedge fixing port. Therefore, the cable strand can be individually and conveniently replaced.

Description

CABLE FIXING APPARATUS FOR CABLE BRIDGE USING BALL JOINT CARDAN, AND CABLE STRAND REPLACEMENT METHOD THEREWITH}

The present invention relates to a method for replacing a cable for a bridge using a cable fixing device, and more specifically, to install a ball joint cardan (Ball Joint Cardan) in the saddle (Saddle) installed in the pylon of the cable-stayed bridge or extra-dose bridge The present invention relates to a cable anchoring device using a ball joint cardan and a cable strand replacement method using the same, by which the cable strands can be individually and simply replaced by fixing the cable strands.

In general, cable bridges such as cable-stayed bridges and extra-dosed bridges (ED bridges) are known as bridges installed on trunk roads and railway tracks. The cable-stayed bridge and the extra-dose bridge are configured to support the mold by a plurality of cables extending at an angle from the pylon arranged perpendicularly to the mold or the bridge deck.

In the pylons of such cable-stayed bridges and extra-dose bridges, saddle structures are used. Such a saddle structure is configured to support the middle part of the cable in which both ends are fixed to the mold or the bridge deck at the tower column portion, for example, a saddle structure using multiple cables is known.

1 is a photograph illustrating a general ED cable-stayed bridge, Figure 1 a) shows the ED cable-stayed bridge, Figure 1 b) is a view showing the saddle position installed on the main tower of the ED cable-stayed bridge.

As shown in a) of FIG. 1, ED bridge is a new type of bridge that combines the advantages of girder bridge and cable-stayed bridge, which is lighter and longer than conventional PSC girder bridge. Because of its small size and the height of the pylon, the construction and economic feasibility of the cable-stayed bridge is superior to the cable-stayed bridge between 250-400m. These ED bridge cable systems include cables, saddles and anchorages. At this time, ED bridges come in two types: birds and birds.

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

As shown in FIG. 2, a typical ED bridge cable system includes a main column 11, a saddle 12, an anti-slip device 13, a cable 14, an anchorage 150, and a bridge deck 16.

The saddle 12 of the ED bridge serves to transfer the static and cyclic loads transmitted from the cable 14 to the main tower 11, and the unbalanced cyclic loads on both sides of the main tower 11 transferred through the cable 14. It should be fixed so that the slip of the cable 14 does not occur. There are integral saddles and strand separate birds according to the slip prevention type of the cable. In particular, the split saddle is intended to dissipate the stresses leading to compression stress and pylon concrete cracking between the cable strands.

Specifically, the cable-stayed bridge or ED bridge first sets the tubular birds with curvature prior to the tower top (main tower) concrete placement, and then constructs the tower tower by pouring the tower top concrete of the tower so that the birds are buried. Cables are installed to penetrate the birds, and both ends of the cables penetrating the birds are constructed to be tensioned in a fixing end installed in a girder or bridge deck disposed below the main column.

That is, the cable bridge is constructed in the saddle (Saddle) through the process of allowing the cable to be drawn out to the opposite exit portion of the main tower via the inside, the both ends of the cable penetrates through the bridge top plate to tension the bridge top plate and then settle it. .

On the other hand, Figure 3 is a diagram illustrating that the birds according to the prior art is installed.

As shown in a) and b) of FIG. 3, the exterior 21 is arranged in a curved shape inside the pylon, and an end of the exterior 21 is open at an opposite outer side of the pylon, and the exterior 21 Inner tube 22 is inserted into one.

At this time, a plurality of cables 23 are disposed in one inner tube 22. In addition, a grouting material 24 is filled in the inner tube 22, and the horizontal force exerted by the friction force between the grouting material 24 and the cable 23 is attached to each other by the grouting material 24. Will resist. The cable 23 forms a core material in which a plurality of wires are twisted, and the core material is epoxy coated.

In particular, the saddle installation part must be able to withstand the horizontal forces acting without deformation of the cable, be installed in a protective structure by rust prevention, and secure the resistance against fatigue caused by fritting. The cable should be easy to replace.

However, the resistance performance due to the horizontal force may cause the cable to fail as the corrosion resistance of the cable is deteriorated due to the defect such as cracks in the filled and hardened grouting material.The cable having such a defect must be replaced. do.

That is, the saddle according to the prior art using the outer tube 21 and one inner tube 22 cannot replace only the cable strand in which the defect is generated, and all the cables must be replaced.

In the case of the separated birds described above, cable strands are distributed and inserted into individual steel pipes, thereby eliminating compressive stress and fritting phenomena between the strands in the saddle, and significantly reducing stress concentrations causing harmful cracking in the pylon. You can. For example, these separate saddles include round steel pipe mortar saddles, round steel pipe key tape saddles, and V steel pipe saddles.

However, in the case of round steel mortar-type birds, it is difficult to check the corrosion of the cable strands in the saddle section of the pylon in which the PE coating layer is removed, and there is a disadvantage that the cable strands cannot be individually replaced.

In addition, in the case of the round steel pipe key tape saddle, due to the method of cross-installing the key (key) before and after the pylon, only 50% of the cable strands are structurally loaded, which has the disadvantage of increasing the cable rated tension and the number of strands.

In addition, in the case of V-type steel pipe saddle, the strand is tightly fixed to the V-type steel pipe, and when there is an error in installing the saddle and the cable fixing part, there is no room for rotating a certain angle, and thus there is a disadvantage that fatigue damage may occur due to stress concentration. In addition, it is difficult to check the corrosion protection of the portion where the PE sheath of the cable strand is removed, and the manufacturing cost of the V-type steel pipe has a disadvantage that is higher than the conventional round steel pipe.

Republic of Korea Patent No. 10-1150352 (filed March 24, 2010), the title of the invention: "Saddle structure and tension cable" Japanese Patent Application Laid-Open No. 2011-162942 (published: August 25, 2011), title of the invention: "Saddle structure and tension cable"

The technical problem to be solved by the present invention is to install a ball joint cardan on a detachable saddle installed in the pylon of the cable-stayed bridge or extra-dose bridge and to fix the cable strands individually through the wedge anchorage, respectively, Cable fixing device using a ball joint cardan that can be easily installed and replaced by providing a tapered strand insertion hole in the ball joint cardan while being distributedly inserted into the round steel pipe, and a method of replacing the cable strand using the same It is to provide.

The present invention to achieve the above technical problem

Separated saddle in which a plurality of cable strands are distributed separately inserted, comprising: a separate steel pipe disposed to penetrate both sides of the pylon of the cable-stayed bridge or extra-dose bridge; One end is fastened to the end of the removable steel pipe, the other end of the threaded cardan base; And a cardan lower housing, a cardan upper housing and a ball joint, wherein the cardan base is connected to the cardan lower housing, and a ball joint is integrated between the cardan lower housing and the cardan upper housing. Ball joint cardan; A connection nut installed for expansion joint connection between the cardan base and the cardan lower housing of the ball joint cardan; And plate fixing bolts fastened to and fixed to the through-holes formed in the upper end of the cardan and the lower end of the cardan, respectively. The cable strand is released from the tension of the wedge fitting by rotating the connection nut as much as possible. Replaces each
The ball joint cardan includes a cardan lower housing having a plurality of through holes for fastening the plate fixing bolt and connected to the cardan base by the connection nut; A cardan upper housing having a plurality of through holes for fastening the plate fixing bolts to be coupled to the cardan lower housing by fastening the plate fixing bolts; And a taper-shaped strand insertion hole, respectively, and includes a ball joint inserted into and integrated between the cardan lower housing and the cardan upper housing.

In addition, the present invention

a) disposing a split steel pipe in the form of a circular steel pipe in the main tower tower of the cable-stayed bridge or an Extradosed bridge (ED bridge), and installing a plurality of cable strands through the circular steel pipe of the split steel pipe; b) fastening a cardan base to an end of the split steel pipe and disposing a ball joint cardan with a ball joint inserted between the cardan lower housing and the cardan upper housing on the other side of the cardan base; c) installing a connection nut for expansion joint between the cardan base and the ball joint cardan; d) respectively entering cable strands into strand insertion holes formed in the ball joints of the ball joint cardan; e) penetrating and fixing the cable strand entered the strand insertion hole; f) introducing tension into each of the cable strands; g) fastening the stop bolts to the stop bolt fastening holes respectively formed in the thread of the connection nut and the cardan base so that the cable strand is normally installed in the wedge fitting port and retains tension force; And (h) temporarily removing the stop bolts for the individual replacement of the cable strands, and replacing the cable strands individually by rotating the connection nut to release the tension of the wedge fittings.
The ball joint of the ball joint cardan of step d) is each formed with a taper-shaped strand insertion hole for installation of the cable strand, and the wedge of step e) is a separate portion of the cable strand on the opposite side of the wedge fitting. Inserted into the strand insertion hole of the ball joint in a state that is opened at a predetermined angle by the wedge fixing spring during insertion, in the step e) the cable strands are each formed of polyethylene (PE) coating layer, the corrosion resistance performance of the cable strand Only the wedge fittings are anchored with the PE sheath layer removed from the cable strand to prevent reduction.

According to the present invention, by providing a tapered strand insertion hole in the ball joint, the cable strand can be easily installed and replaced, and assembled into a cardan base, a connection nut, a ball joint cardan, and a wedge fitting structure, Insertion of cable strands is convenient and work efficiency can be increased.

According to the present invention, as the detachable saddles installed in the pylon of the cable-stayed bridge or the extra-dose bridge, the cable strands are separately inserted into the circular steel pipe to eliminate the compressive stress and the fretting fatigue between the strands within the detachable saddle. In addition, the stress concentration phenomenon that causes harmful cracking 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, the corrosion resistance performance can be prevented from being reduced by removing only a part of the cable strands installed in the wedge fittings among the plurality of cable strands coated with polyethylene (PE), and the outer surface of the cable strands is coated with a coating material to sufficiently reduce the frictional force. It can be secured.

1 is a photograph illustrating a typical ED cable-stayed bridge.
2 is a diagram illustrating a configuration of a general ED bridge cable system.
3 is a diagram illustrating that birds according to the prior art are installed.
4 is an exploded view of the cable fixing device using the ball joint cardan and the wedge fitting according to the embodiment of the present invention.
5 is a view illustrating a separate steel pipe saddle, a ball joint cardan and a wedge fitting, respectively, of the cable fixing device using the ball joint cardan and the wedge fitting according to the embodiment of the present invention.
6 is a perspective view illustrating a ball joint cardan which is fastened to a cardan base in a cable fixing device using a ball joint cardan and a wedge fitting according to an embodiment of the present invention.
7A to 7C are cross-sectional views illustrating that the ball joint cardan is fastened to the cardan base by a connection nut in the cable fixing device using the ball joint cardan and the wedge fitting according to the embodiment of the present invention.
8 is a side cross-sectional view illustrating that the ball joint cardan and the wedge fastener are coupled to the cable fixing device using the ball joint cardan and the wedge fastener according to the embodiment of the present invention.
9 is a front view showing that the ball joint cardan and the wedge fastener is coupled in the cable fixing device using the ball joint cardan and the wedge fastener according to the embodiment of the present invention.
FIG. 10 is a cross-sectional view of the CC line illustrated in FIG. 9 as an incision line.
FIG. 11 is a diagram illustrating region D in FIG. 10 in detail.
12 is a flowchart illustrating a method of constructing a cable fixing device using a ball joint cardan and a wedge fitting according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

[Cable fixing device 100 using a ball joint cardan]

Figure 4 is an exploded view of the cable fixing device using a ball joint cardan and wedge fitting according to an embodiment of the present invention, Figure 5 is a detachable type of cable fixing device using a ball joint cardan and wedge fitting according to an embodiment of the present invention. A diagram illustrating the steel pipe saddle, the ball joint cardan and the wedge fitting, respectively.

4 and 5, the cable fixing device 100 using the ball joint cardan and the wedge fitting according to the embodiment of the present invention, a detachable steel pipe 110, cardan base (Cardan Base; 120), ball joint Cardan 130, the wedge fitting 140, the plate fixing bolt 150, stop bolt 160 and the connection nut 170 is included.

The split steel pipe 110 is for dispersing the compressive stress between the cable strands 210 and the pylon compression stress and the pylon concrete crack-inducing stress, the split steel pipe 110, as shown in Figure 5a) Likewise, the plurality of cable strands 210 are individually distributed and inserted into the steel pipes, and are arranged to penetrate both sides of the pylon of the cable-stayed bridge or the Extradosed bridge (ED bridge). In this case, the split steel pipe 110 is distributedly inserted into the plurality of cable strands 210 in the circular steel pipe to distribute the stress between the compression stress between the plurality of cable strands 210 and the pylon concrete. In addition, by coating a friction material on the inner surface of the circular steel pipe or the cable strand of the removable steel pipe 110 to increase the frictional force.

Cardan base 120 is one side is fastened to the end of the detachable steel pipe 110, the thread 121 is processed on the other side, as shown in Figure 6 to be described later, the stop bolt fastening hole on the thread 121 122 is formed.

The ball joint cardan 130 is composed of a cardan lower housing 131, a cardan upper housing 132, and a ball joint 133, and the cardan base (13) in the cardan lower housing 131. 120 is connected, and a ball joint 133 is installed between the lower cardan housing 131 and the upper cardan housing 132 to be integrated.

Specifically, as shown in b) of Figure 5, the cardan lower housing 131 of the ball joint cardan 130 is formed with a plurality of through holes for fastening the plate fixing bolt 150, It is connected to the cardan base 120 by the connection nut 170. In addition, the cardan upper housing 132 of the ball joint cardan 130 is formed with a plurality of through-holes for fastening the plate fixing bolt 150. It is coupled to the cardan lower housing 131 by the fastening of the plate fixing bolt 150. In addition, the ball joint 133 of the ball joint cardan 130 is formed with a tapered strand insertion hole 211, respectively, the cardan lower housing 131 and the cardan upper housing 132 It is inserted in between and integrated.

The connection nut 170 is installed for expansion joint connection between the cardan base 120 and the cardan lower housing 131 of the ball joint cardan 130.

Wedge fitting 140 is made of a wedge fixing plate 141, a wedge 142, a wedge fixing spring 143 and the wedge pressure bolt 144,

The wedge 142 is inserted into the cardan upper housing 132 of the ball joint cardan 130 to fix the plurality of cable strands 210, respectively.

Here, each of the cable strands 210 is formed of a polyethylene (PE) coating layer, and the PE coating layer of the cable strands 210 only at the wedge fittings 140 so as to prevent a decrease in the corrosion resistance performance of the cable strands 210. It is preferable to fix in the state which removed.

Specifically, as shown in c) of FIG. 5, the wedge fixing plate 141 of the wedge fitting 140 is formed with a through hole to fix the wedge 142 to the ball joint cardan 130. .

In addition, the wedge 142 of the wedge fitting hole 140 is inserted into the ball joint 133 in which the tapered strand insertion hole 211 is formed to fix each of the cable strands 210.

In addition, the wedge fixing spring 143 of the wedge fitting 140 is coupled to the end of the wedge 142 to open the wedge 142 at an angle.

In addition, the wedge pressing bolts 144 of the wedge fittings 140 press the wedges 142 so that the cable strands 210 are fixed.

Accordingly, the wedge 142 is the strand of the ball joint 133 in a state that is opened at a predetermined angle by the wedge fixing spring 143 when the cable strand 210 is inserted separately from the opposite side of the wedge fitting 140 (140) It may be inserted into the insertion hole 211.

Plate fixing bolt 150 is fastened and fixed to the through-holes formed in the wedge fixing plate 141, the cardan upper housing 132 and the cardan lower housing 131 of the wedge fixing opening 140, respectively.

The stop bolt 160 is a stop formed on the thread 121 of the connection nut 170 and the cardan base 120 so that the cable strand 210 is normally installed in the wedge fitting opening 140 to retain tension. It is fastened to the bolt fastening hole 122.

In addition, the stop bolt 160 is temporarily removed for the individual replacement of the cable strand 210, the cable in a state in which the tension of the wedge fitting 140 is released by rotating the connection nut 170 as much as possible The strands 210 can be replaced individually.

In other words, the shape of the birds using the existing wedge is assembled to the slip prevention device without installing the wedge at the work site, and it is difficult to replace the individual strands, but the ball joint cardan and the wedge fitting according to the embodiment of the present invention In the case of the cable fixing device 100 using, the wedge 142 can be pushed into the fixing position of the wedge fitting 140 only by tightening the wedge compression bolt 144 after the cable strand 210 is inserted and tensioned. Therefore, the cable can be easily installed. In addition, by using the connection nut 170 to enable the expansion joint, the slip prevention device can easily replace the individual strands during construction and mistakes during construction.

On the other hand, Figure 6 is a perspective view showing a ball joint cardan fastened to the cardan base in the cable fixing device using a ball joint cardan and wedge fitting according to an embodiment of the present invention, Figure 7a to Figure 7c is a ball by the connection nut 7A and 7B are cross-sectional views taken along line AA of FIG. 6 as cut lines, and FIG. 7C is a detailed view of region B shown in FIG. 7A. .

As shown in FIG. 6, the ball joint cardan 130 may be fastened to the cardan base 120 in the cable fixing device 100 using the ball joint cardan and the wedge fitting according to the embodiment of the present invention. At this time, the connection nut 170, which is capable of expansion joint, is installed between the cardan base 120 and the cardan lower casing 131 of the ball joint cardan 130.

FIG. 7A is a cross-sectional view of the A-A line shown in FIG. 6 as a cut line, and illustrates the fastening state of the cardan lower housing 131 and the cardan base 120 when the cable and the anchorage are in a normal installation state and a retaining force.

In addition, Figure 7b is a cross-sectional view of the AA line shown in Figure 6, removing the stop bolt 160 to replace the individual cable strand 210, wedge by rotating the connecting nut 170 as possible The tension state of the fixing unit 140 is released. In addition, FIG. 7C specifically shows the region B shown in FIG. 7A, and shows that the stop bolt 160 is fastened to the thread of the cardan base 120. Here, reference numeral 134 denotes a free rotation joint.

On the other hand, Figure 8 is a side cross-sectional view showing that the ball joint cardan and the wedge fastener is coupled in the cable fixing device using the ball joint cardan and wedge fitting according to an embodiment of the present invention.

As shown in FIG. 8, in the cable fixing device 100 using the ball joint cardan and the wedge fitting port according to the embodiment of the present invention, a tapered strand insertion hole formed in the ball joint 133 of the ball joint cardan 130 is provided. The cable strand 210 may be inserted through 211 and the wedge 142 of the wedge fixing unit 140 may be inserted to fix the cable strand 210. In this case, 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 case of ED bridge birds according to the prior art, because the length of the cable strand 210 installed in the saddle section is very short when using the wedge is sufficient when the replacement of the cable strand 210 during construction or maintenance Failure to provide stretch, and forcibly tensioning and releasing the fixed wedges may cause excessive damage to the tower concrete, which can cause significant damage.

On the contrary, in the middle of the ball joint cardan 130 and the cardan base 120 according to the embodiment of the present invention, a connection nut 170 enabling expansion joints may be added and connected. In addition, by releasing the stop bolt 160 fixing the connection nut 170, a thread 121 exposing the connection nut 170 to the threaded portion of the cardan base 120 with a dedicated tool. Rotate until it covers all of the tensioned wedge 142 and cable strand 210 can be easily released by loosening.

On the other hand, Figure 9 is a front view showing that the ball joint cardan and the wedge fastener is coupled in the cable fixing device using a ball joint cardan and wedge fitting according to an embodiment of the present invention, Figure 10 is a section CC line shown in Figure 9 Fig. 11 is a view specifically showing the area D shown in Fig. 10, in which a) in FIG. 11 shows a wedge state before the installation of cable strands and b) in Fig. 11 shows a wedge after the cable strand tension. Indicates the state.

As shown in FIG. 11A, the wedge 142 of the wedge fitting 140 is assembled in a state in which it is opened at an angle by the wedge fixing spring 143. That is, as shown in FIG. 10, the wedge 142 is entered into an open state at an angle by the wedge fixing spring 143 so that the cable strand 210 can enter without any trouble when inserted from the opposite side of the cable strand 210.

Accordingly, according to an embodiment of the present invention, by separately distributing the cable strands into the circular steel pipe, it is possible to eliminate the compressive stress and fritting fatigue phenomenon between the strands inside the split saddle, and also harmful to the pylon The stress concentration that leads to cracking can be significantly reduced and dispersed.

[Cable strand replacement method using cable fixing device using ball joint cardan]

12 is an operation flowchart of a cable strand replacement method using a cable fixing device using a ball joint cardan according to an embodiment of the present invention.

Referring to Figure 12, the construction method of the cable fixing device using the ball joint cardan and the wedge fitting according to the embodiment of the present invention, first, a circular steel pipe in the main tower tower of the cable-stayed bridge or Extradosed bridge (ED bridge) Arrangement of the separated type steel pipe 110, and install a plurality of cable strands 210 to pass through the circular steel pipe of the removable steel pipe (110) (S110).

In this case, the split steel pipe 110 may be distributedly inserted into the plurality of cable strands 210 in the circular steel pipe to distribute the stress between the plurality of cable strands 210 and the stress induced by the crack of the pylon concrete. .

Next, the cardan base 120 is fastened to the end of the split type steel pipe 110, and a ball joint card 133 is inserted between the cardan lower housing 131 and the cardan upper housing 132. The stage 130 is disposed on the other side of the cardan base 120 (S120).

Here, the ball joint 133 of the ball joint cardan 130 is formed with a tapered strand insertion hole 211 for installing the cable strand 210, respectively.

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

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

Next, in the state in which the wedge 142 of the wedge fitting port 140 is opened, the cable strand 210 entered through the strand insertion hole 211 is penetrated and fixed (S150).

Here, the wedge 142 is a strand insertion hole of the ball joint 133 in a state that is opened at a predetermined angle by the wedge fixing spring 143 when the cable strand 210 is separately inserted at the opposite side of the wedge fitting hole 140. 211).

Next, the wedge fitting bolt 144 of the wedge fitting port 140 is fastened to press the wedge 142 and introduce a tension force to each of the cable strands 210 (S160).

Next, the stop bolt fastening holes respectively formed in the thread 121 of the connection nut 170 and the cardan base 120 so that the cable strand 210 is normally installed in the wedge fitting port 140 to retain the tension force. Fastening the stop bolt 160 to (122) (S170).

In addition, each of the cable strands 210 is formed of a polyethylene (PE) coating layer, and the PE coating layer of the cable strands 210 only at the wedge fittings 140 so as to prevent a decrease in corrosion resistance performance of the cable strands 210. It can be settled in the state which removed. In this case, it is preferable to increase friction by coating a friction material on the inside of the circular steel pipe or the surface of the cable strand of the removable steel pipe 110.

When it is necessary to replace the cable strand 210 is to remove the temporary stop bolt 160 for the individual replacement of the cable strand (210). Accordingly, the cable strand 210 is individually replaced in the state where the connection nut 170 is rotated as much as possible to release the tension state of the wedge fitting 140 (S180).

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

100: cable fixing device using ball joint cardan and wedge fitting
110: detachable steel pipe (Saddle) 120: cardan base (Cardan Base)
130: ball joint cardan 140: wedge stop
150: plate fixing bolt 160: stop bolt
170: connecting nut
121: Thread 122: Stop bolt tightening hole
131: cardan lower housing 132: cardan upper housing
133: ball joint
141: wedge fixing plate 142: wedge
143: wedge fixing spring 144: wedge compression bolt
210: cable strand 211: strand insertion hole

Claims (8)

Separated saddles in which a plurality of cable strands 210 are separately distributed and inserted, the separated steel pipe 110 is disposed to penetrate both sides of the pylon of the cable-stayed bridge or extra-dose bridge;
A cardan base 120 having one side fastened to an end of the removable steel pipe 110 and a thread 121 processed at the other side;
The cardan lower housing 131, the cardan upper housing 132, and the ball joint 133, the cardan base 120 is connected to the cardan lower housing 131, and the cardan lower housing A ball joint cardan 130 having a ball joint 133 installed between the 131 and the cardan upper housing 132 to be integrated;
A connection nut 170 installed for expansion joint connection between the cardan base 120 and the cardan lower housing 131 of the ball joint cardan 130; And
And a plate fixing bolt 150 fastened and fixed to the through holes formed in the cardan upper housing 132 and the cardan lower housing 131, respectively.
Rotating the connection nut 170 to the maximum to release the tension of the wedge fitting 140 to replace the cable strand 210 individually,
The ball joint cardan 130 has a plurality of through holes for fastening the plate fixing bolts 150, and a lower cardan connected to the cardan base 120 by the connection nut 170. A housing 131; A cardan upper housing 132 formed with a plurality of through holes for fastening the plate fixing bolts 150 to be coupled with the cardan lower housing 131 by fastening the plate fixing bolts 150; And a taper-shaped strand insertion opening 211, each of which includes a ball joint 133 inserted into and integrated between the lower cardan housing 131 and the upper cardan housing 132. Cable fixing device using cardan. The method of claim 1,
The stop bolt fastening hole 122 formed in the thread 121 of the connection nut 170 and the cardan base 120 so that the cable strand 210 is normally installed in the wedge fitting port 140 to maintain tension. Cable fixing device using a ball joint cardan further comprising a stop bolt 160 is fastened to. The method of claim 2,
The wedge fixing plate 141, the wedge 142, the wedge fixing spring 143 and the wedge compression bolt 144, the wedge 142 is the cardan upper housing of the ball joint cardan 130 ( Wedge fittings 140 inserted into 132 to fix each of the plurality of cable strands 210 are additionally installed so that the stop bolt 160 can be temporarily removed for individual replacement of the cable strands 210. Cable fixing device using cardan. delete The method of claim 1,
The wedge fitting 140,
A wedge fixing plate 141 for fixing the wedge 142;
A wedge 142 inserted into a ball joint 133 in which a tapered strand insertion hole 211 is formed to fix each of the cable strands 210;
A wedge fixing spring 143 coupled to an end of the wedge 142 to open the wedge 142 at an angle; And
Wedge pressing bolts 144 for pressing the wedge 142, respectively, so that the cable strand 210 is fixed, but
The wedge 142 is a strand insertion hole 211 of the ball joint 133 in a state that is opened at an angle by the wedge fixing spring 143 at the individual insertion of the cable strand 210 on the opposite side of the wedge fitting 140 (140) Cable fixing device using a ball joint cardan, characterized in that inserted into the). The method of claim 1,
A friction material is coated on the inside of the circular steel pipe or the surface of the cable strand of the separable steel pipe 110 to increase friction, and the cable strand 210 is formed of polyethylene (PE) coating layer, respectively, of the cable strand 210. Cable fixing device using a ball joint cardan, characterized in that to fix in a state in which the PE coating layer of the cable strand 210 is removed only in the wedge fitting port 140 to prevent a decrease in corrosion resistance performance. a) a plurality of cable strands 210 are disposed on the main tower top of the cable-stayed bridge or extra-dosed bridge (ED bridge), and the plurality of cable strands 210 are formed to penetrate the circular steel pipe of the separated steel pipe 110. Installing);
b) a ball joint cardan which fastens the cardan base 120 to the end of the detachable steel pipe 110 and has a ball joint 133 inserted between the cardan lower housing 131 and the cardan upper housing 132. Placing (130) at the other side of the cardan base (120);
c) installing a connection nut 170 for expansion joint between the cardan base 120 and the ball joint cardan 130;
d) respectively entering the cable strands 210 into the strand insertion holes 211 formed in the ball joint 133 of the ball joint cardan 130;
e) penetrating and fixing the cable strand 210 entered into the strand insertion hole 211;
f) introducing tension into each of the cable strands 210;
g) the stop bolt fastening hole 122 formed in the thread 121 of the connection nut 170 and the cardan base 120 so that the cable strand 210 is normally installed in the wedge fitting 140 and retains tension force. Fastening the stop bolt 160 to the step (); And
(h) Temporarily removing the stop bolt 160 for individual replacement of the cable strand 210, and rotating the connection nut 170 to release the tension of the wedge fitting 140. Replacing the strands 210 individually;
The ball joint 133 of the ball joint cardan 130 of step d) is each formed with a tapered strand insertion hole 211 for installation of the cable strand 210, the step of step e) The wedge 142 may be inserted into the strand insertion hole 211 of the ball joint 133 in a state in which the wedge fixing spring is separated by an angle by the wedge fixing spring 143 when the cable strand 210 is separately inserted at the opposite side of the wedge fitting 140. In the step e), the cable strands 210 are each formed of a polyethylene (PE) coating layer, and the cable strands only at the wedge fittings 140 to prevent a decrease in the corrosion resistance performance of the cable strands 210. Cable strand replacement method using a cable fixing device using a ball joint cardan, characterized in that the fixing in the state of removing the PE coating layer (210). delete

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