JPH0626012A - Cable tension grip for cable stayed bridge and loading carriage thereof - Google Patents

Abstract

PURPOSE:To shorten the construction period by connecting a traction rod to a fixing block provided on the lower end of a cable through a coupler, and tensing the cable by tractively moving the block. CONSTITUTION:After aligning a traction rod 13 and a fixing block 116 connected to the lower end of a cable, a coupler 16 is screwed in so as to make the rod 13 and the block 116 in one body. Next, hydraulic pressure is supplied into a first oil chamber 17 of a hydraulic jack 9 so as to retreat a piston 21 and retreat the traction rod 13 through a rod 21a, and hence the block 116 is attracted and the cable is tensed. Further, a nut member 117 is screwed in as far as it will run into a pressure bearing plate 118 so as to eliminate the clearance between the fixing nut member 117 and the pressure bearing plate 118.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tensioning device for tensioning a cable in a cable-stayed bridge to a predetermined tension, and a trolley equipped with the tensioning device.

[0002]

BACKGROUND OF THE INVENTION and Prior Art A cable-stayed bridge is one of the bridges classified as girder bridges, and a girder (bridge floor) is supported by a large number of cables diagonally installed between the main tower and the main girder. It has a structure supported by. Recently, by using as a main member (tensile member) a cable in which a large number of PC steel materials obtained by twisting strands, which has been a kind of auxiliary material, is used as a main member (tensile material), the cross section and weight of the main girder are reduced and it is very long There is increasing recognition as having a structure suitable for building bridges.

FIG. 16 shows the appearance of a fan-type cable-stayed bridge, which is an example of such a cable-stayed bridge. Such cable-stayed bridges are roughly classified into two types according to the arrangement of cables installed between the main tower 101 and the girder 102. One of them is a system in which the main tower 101 is erected on both sides (both sides in the width direction) of the girder, and the cables 103 are installed between the main tower 101 and both sides of the girder 102 to make tension (so-called). "Double-sided" method), others are girders 1
Main tower 101 and girder 102 erected in the center of 02 in the width direction
This is a system (a so-called “single-side suspension” system) in which the cable 103 is installed and tensioned between the central portions in the width direction.

In the construction of a cable-stayed bridge, generally, a large number of PC steel materials are pretensioned and installed between the main tower and the main girder, and finally the entire cable in which the PC steel materials are bundled is required. It is usual to adjust the tension so that it becomes a tension. The cable is usually constructed by bundling a large number of PC steel materials in which a plurality of strands are twisted, and the ends of the PC steel materials are fitted one by one into the through holes of a fixing block having a large number of through holes. Inserted,
For example, it is fixed with a three-part wedge.

By the way, recently, the cable-stayed bridge has been constructed with an extremely large scale as described above. Therefore, since the girder weight becomes large, the girder is suspended by the main tower. The tension applied to the cable is also increasing. As a result, a device used for cable tension becomes large and heavy, and it is desired to easily install such a cable tension device.

Further, it is necessary to adjust the cable tension by various factors after construction to maintain the tension in a desired state.

[0007]

As described above, various problems to be improved have been pointed out as the cable-stayed bridge becomes larger in size.

In view of these circumstances, the present inventor has eagerly conducted research and development in order to solve the following problems, especially for a device for giving a great tension to a cable.

The present invention has heretofore been regarded as a labor-intensive and burdensome work, and it has been difficult to carry out this work easily. The present invention is made to improve the work of cable tension in such a cable-stayed bridge,
One of the objects thereof is to provide a cable tensioning device capable of performing a work in a short work period in a large number of cable tensioning works, and a device capable of performing this work quickly over a large number of cables. Where it is.

Another object of the present invention is to devise so that the work of cable tension and adjustment can be easily carried out, and for example, in a road bridge, the cable tension force can be improved without being significantly affected by the usage condition of the road. The purpose is to provide a cable tension device for a cable-stayed bridge that can be adjusted.

Still another object of the present invention is to provide a bogie which can be conveniently used for a cable-stayed bridge having, for example, a box-shaped structure by mounting a cable tension device on a moving bogie. .

[0012]

In order to achieve the above object, the inventor of the present invention has completed the present invention described in each claim of the above claims.

One of the features of the tension device for a cable-stayed bridge cable of the present invention is that the cable tensioned between the tower and the girder of the cable-stayed bridge is tensioned to a predetermined tension. The fixing block for tensioning the cable, which is provided at one end of the fixing block, is pulled and tensioned in the extension direction of the cable with respect to the cable fixing part of the tower or girder, and in this state, the fixing screw part provided in the fixing block. A cable tensioning device for fixing a cable end by screwing a nut member screwed into a cable until it abuts on a cable fixing part of the tower or girder so that it can be brought into contact with the end part of the fixing block. , A cable-side first towing screw portion provided at the end of the fixing block, and a first towing screw portion provided on the rod side so as to be continuous with the first towing screw portion. 2 towing screws and these , A screwed coupler for connecting the fixing block and the pulling rod so as to integrally move in the axial direction by being screwed over the second pulling screw portion, and fitted to the fixing portion of the tower or girder with which the nut member abuts And a tensioning device main body that is positioned on the extension line of the cable with respect to the fixed portion of the tower or girder by a distance corresponding to the length of the chaining device, and the towing rod provided on the tensioning device main body. And a hydraulic mechanism for forcibly moving the cable in the cable tension direction.

The cable tensioning device of the present invention is applied to both the case of performing the operation of tensioning the cable end portion on the main tower side or the case of performing the operation of tensioning the cable end portion on the girder side, as in the conventional case. However, the application mode is not particularly limited, but when it is used in a cable-stayed bridge having a box girder structure, as described below, the tensioning device is mounted on the carriage to make the work easier. Can be converted.

The above-mentioned traction rod and hydraulic mechanism may be provided coaxially with the apparatus main body.

The cable fixing portion of the tower or girder against which the nut member abuts is usually provided by a bearing plate fixedly assembled to the tower or girder.

As described above, the tensioning device main body having the coaxially provided traction rod and hydraulic mechanism is parallel to the axial direction of the traction rod via the mechanism for vertically moving and the mechanism for tilting. It is preferably mounted on a carriage that can move in any direction. Further, it is particularly preferable that the dolly is detachably provided with wheels that facilitate the movement of the tow rod in the horizontal direction (lateral direction) perpendicular to the axial direction.
According to the trolley in which such wheels for lateral movement are detachably provided, when the main girder is provided in the box girder structure, the inner wall that partitions the inside of the main girder of the box girder structure in the longitudinal direction is provided. This is because the opening provided for the truck to pass through can be made sufficiently small within a necessary and sufficient range.

Further, in the above-mentioned structure, in the chain or the like for positioning the tension device main body at a fixed distance from the fixed portion such as a girder, the central axes of the pulling rod and the fixing block at the cable end are made to coincide with each other. It is preferable to provide a means for accurately ensuring the continuity of the provided first and second towing screw portions. For example, the fixing part of the girder and the chain may be provided with concave-convex fitting parts at a plurality of positions in the circumferential direction, or the fixing block at the cable end and the central position of the facing surface of the pulling rod engaged with the fixing block. A second concave-convex loose fitting portion is provided,
Further, it is recommended that a plurality of concave-convex fitting portions for closely matching the position and direction of the central axes of the fixing block and the pulling rod that engages with the fixing block be provided.

In the present invention, the coupler can be preliminarily assigned to either the fixing block at the cable end or the tow rod, but it can be screwed to the tow screw portion of the latter tow rod. For example, this coupler can be commonly used for multiple cables.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the drawings, but it goes without saying that the present invention is not limited to this embodiment. 1 to 16 showing the present embodiment, the cable-stayed bridge as a "one-sided" type road bridge in which a cable 103 is erected between the main tower 101 and the girder 102 at the center position in the width direction of the girder. The example which applied the invention is shown.

FIG. 15 shows the girder 10 of the box girder structure of the cable-stayed bridge of this example.
2 shows a part of the cross section taken in the width direction, and FIG. 14 shows a part of the same taken in the length direction. 10
5 is formed, and is formed as a box girder structure having a predetermined strength.

The cavities 104 and 105 are partitioned by a partition wall 106 at regular intervals in the longitudinal direction of the main girder.

In order to apply the cable tensioning device of this embodiment, as a characteristic structure of the main girder 102, a partition wall 106 partitioning the hollow portion 104 in the central portion in the width direction into the girder lengthwise direction, As will be described later, a substantially rectangular opening 107 is provided to form a passage so that a truck equipped with a cable tension device can pass through. Note that 108 is the main girder 10.
2 is a bottom slab, and 109 is an upper slab.

Numeral 110 is a central separator provided in the widthwise central portion of the upper slab 109.
10, intermittently in the longitudinal direction, as shown in FIG.
A protrusion 111 for fixing the lower end of the cable 103 is provided, and 112 is a fixing tool fitting hole for the protrusion 111. The protrusion 111 is provided by setting the fixing tool at the lower end of the cable at a predetermined position before forming it, and then pouring concrete. Needless to say, the installation angle of the fixing tool is adapted to the different installation angles of the cables 103 in FIG. Reference numeral 112a denotes a stepped counterbore provided at the lower end opening of the fixing tool fitting hole 112, a pressure plate is fitted thereto as described later, and a fixing block fixed to the lower end of the cable is fixed via a fixing nut member. It is supposed to support.

FIGS. 1 and 2 are for explaining the fixing structure of the upper end portion (see FIG. 2) and the fixing structure of the lower end portion (see FIG. 1) of the cable 103 of the cable-stayed bridge constructed in this example. is there. At the end of the cable on the main tower side, as shown in FIG.
4, the upper stepped spot facing portion 1 of the fitting hole 114 is fixed.
The upper end of the cable is fixed to the main tower 101 by engaging with the fixing block 113a provided on the upper end of the cable passing through the fixing tool 113 in the shape of a cylinder corresponding to the bearing plate 115 attached to 14a. .

Further, in the fixing structure on the girder side of the lower end of the cable shown in FIG. 1, the tubular fixing tool 119 is fixed to the projection 111 of the main girder 102 formed by concrete pouring as described above, and this fixing tool is fixed. The lower end of the cable passing through the inside of the fixing block 119 is connected to the fixing block 116, and the fixing nut member 117 screwed to the cable fixing screw portion 116a provided on the outer periphery of the fixing block is engaged with the pressure support plate 118, The lower end of the cable is fixed via the fixing block 116.

An example of the structure of the lower end of the cable is shown in FIG. That is, in the trumpet tube installed inside the tube of the fixing tool 119, a large number of P's forming the cable 103 are formed.
Each of the through holes (see FIG. 3) 11 of the fixing block 116 is formed by tensioning a C steel material (not shown) so as to widen the mutual distance.
Insert one by one into 6b and fix them individually with wedges. Since the structure of such a cable is the same as that of the existing one, detailed description thereof will be omitted. In FIG. 3, 116
b is a large number of through holes provided in the fixing block 116,
Reference numeral 20 is a trumpet tube, and 121 is a grout cap used when filling and injecting cement milk into the cable tube. A grout cap (not shown) is provided at the upper end of the cable on the main tower side. Also, the grout cap 1 at the lower end of the cable
Reference numeral 21 is also used for centering the rod and the fixing block during cable tension work, as will be described later.

Next, the characteristic of this example, that is, in the cable-stayed bridge having the main girder of the box girder structure described above, the fixing block 116 at the lower end of each cable shown in FIG. A cable tensioning device for pulling and tensioning and filling the gap generated by screwing until the fixing nut member 117 abuts and engages with the bearing plate 118 to permanently secure the tensioning force. Also, an example of a trolley equipped with the same will be specifically described.

FIGS. 4 to 13 show a concrete structure of the cable tensioning device of this embodiment and a dolly equipped with the same, and an example of its usage state.

This will be described in detail below. In these drawings, reference numeral 1 is a trolley, and the trolley 1 is composed of a pedestal frame 1a and a bottom plate 1b that form a substantially rectangular plane side, and wheels 2 are attached to the lower portions of the four corners thereof. With
Hooks 3 for hooking winch wires are provided on the front and rear side surfaces near the wheels. Further, as shown in FIG. 7, outriggers 30 with lateral movement wheels 31 are detachably provided at the four corners of the underframe 1a, and the heights of the four underframe corners can be manually adjusted independently by the outriggers. The posture of the trolley 1 can be adjusted, and the trolley 1 is provided so that it can be moved laterally by the lateral movement wheels 31. The outrigger 30 is detachably attached to the underframe 1a in order to reduce the size of the opening 107 of the partition wall 106 of the main girder through which the bogie 1 passes. If the large 107 can be provided, the outrigger may be fixed to the underframe.

The detachable mounting structure of the outrigger 30 will be further described. As shown in FIG. 4, two rows of vertically extending projections 1c are provided on each side of the four corners of the underframe 1a. As shown in FIG. 3, the fixed main body 30a of the outrigger fitted to the protrusion 1c is attached to the screw hole 1d of the protrusion 1c.
It is fixed with a screw 32 that is screwed to. The moving bracket 30b combined with the fixed body 30a
However, the protrusion 1c is loosely fitted in the vertical direction with a certain degree of play. The wheels 31 for lateral movement are attached to the lower part of the moving bracket 30b. The fixed main body 30a and the movable bracket 30b are provided with vertically opposed flanges 301a and 301b, and a manually operated jack 33 is incorporated between the flanges as shown in FIG. 7A. Therefore, when the jack 33 is extended, the moving bracket 30
b is moved downward with respect to the fixed body 30a, and the wheel 31
The ground can be grounded and the truck can be lifted by extending the jack. If this operation is performed for each of the four corners of the bogie, the bogie 1 can be three-dimensionally adjusted in posture, and even if the bottom slab 102 of the girder is inclined, the bogie 1 can be horizontally placed by a simple operation. . 34
7 is an elongated hole in the vertical direction that is loosely fitted to the protrusion 1c provided on the moving bracket 30b, 35 is an adjusting bolt for adjusting the position of the wheel 31 in the left-right direction of FIG. 7B, and 36 is an axle of the wheel 31. . The attachment position of the outrigger 30 is shown by the broken line A in FIG.

If it is not necessary to move the carriage laterally, jacks as indicated by reference numeral 22 in FIG. 12 may be provided at the lower four corners of the carriage instead of the above-mentioned outrigger 30.

The above is the details of the structure of the underframe 1a, the bottom plate 1b, and their surroundings.

Next, the structure of the tensioning device main body mounted on the undercarriage structure of such a bogie and its supporting mechanism will be described.

In the tensioning device main body of this example, the hydraulic jack device 9 is housed in a round barrel type storage cylinder 9a so as to be able to move forward and backward in the axial direction, and the storage cylinder 9a storing this hydraulic jack device 9 is A link mechanism that guides the vertical movement and tilting movement with respect to the underframe 1a of the bogie, and further the storage cylinder 9a.
Is composed of a hydraulic cylinder device as a drive device for vertically moving and tilting, and a forward and backward hydraulic cylinder device as a drive device for moving the hydraulic jack device 9 forward and backward from the storage cylinder 9a.

First of all, the hydraulic jack device 9 is constructed as described above.
A mechanism for vertically moving and tilting the storage cylinder 9a that stores therein will be described. The storage cylinder 9a is provided so as to always maintain a posture parallel to the carriage 1, as shown in detail in FIG. The pair of left and right vertical side plates 7, 7 are pivotally supported and supported by trunnions 8, respectively. The trunnion 8 is fixed to the storage cylinder 9a and rotatable on the vertical side plate 7, and the trunnion connecting arm 8a provided so as to rotate integrally with the trunnion 8 has a tilting hydraulic cylinder. By being rotated by the device 10, the entire storage cylinder 9a is tilted. One end of the tilting hydraulic cylinder device 10 is pivotally supported by the vertical side plate 7 by a pin 10a, and the other end is pivotally supported by the pin 10b at the tip of the trunnion connecting arm 8a.

As shown in FIGS. 4 and 9, the vertical side plate 7 is provided with links 4 and 5 on both sides of the underframe 1a, respectively.
The parallelogram link mechanism is configured by being connected by, and can be moved up and down while maintaining the posture parallel to the carriage 1. A vertical movement hydraulic cylinder device 6 is connected to an intermediate portion of one link 5 of the link mechanism,
It is provided so that the vertical side plate 7 can be moved up or down to an appropriate position by the expansion and contraction thereof. One end of the hydraulic cylinder device 6 for vertical movement is pivotally supported by the pin 6a on the underframe 1a, and the other end is pivotally supported by the pin 6b on the intermediate portion of the link 5. Also, link 4 and link 5 are
The lower ends are pivotally supported on the underframe 1a by pins 4a and 5a, and the upper ends are pivotally supported on the vertical side plate 7 by pins 4b and 5b.

The pair of left and right vertical side plates 7 are reinforced in rigidity by connecting the front ends of the pair of vertical side plates 7 with a bridge connecting plate 7a, as shown in FIG. 7a is provided in a substantially U-shape so as not to interfere with a hydraulic jack device described later.

Next, the hydraulic jack device 9 housed in the housing cylinder 9a will be described. This hydraulic jack device 9 of this embodiment is a forward movement fixed to the housing cylinder 9a as shown in FIG. The tip of the piston rod 9d of the reversing hydraulic cylinder device 9b is engaged, and the expansion and contraction of the hydraulic cylinder device 9b causes the entire hydraulic jack device 9 to advance or retract from the storage cylinder 9a. .

FIG. 10 shows the detailed structure of the hydraulic jack device 9. That is, the hydraulic jack device 9 includes the jack body J housed in the housing cylinder 9a.
, And a towing rod 13 provided so as to project forward from the inside of the jack body J.

In the above, the chain 11 has the structure shown in FIG. 11, and includes the body parts 11a and 11a which are divided into two parts.
The hydraulic jack body J is provided at the rear end of the body portion 11a.
Rear end flanges 11c, 1 for fixing to the front end portion of the
1c and an annular tip flange 11b that is provided at the tip of the body 11a and is engaged with a rectangular bearing plate 118 that is a girder fixing portion of a cable-stayed bridge as described later. The radial projections 11d provided at four locations in the circumferential direction of the flange 11b are provided with axial through holes 11e, and the rods standing on the pressure plate side are loosely fitted into the through holes 11e to engage the chain 11 with the pressure plate 118. It is designed to guide the operation. In this example, the body portion of the chain 11 is divided into two parts to facilitate the operation of rotating the coupler 16 and the fixing nut member 117 from the gap. This is because. In addition, this chain 11
A pin of a bracket 91 is loosely fitted and supported by a long hole in a suspension arm 90 extending from the storage cylinder 9a.

Reference numeral 20 denotes a piston guide fixed to the jack body Jb, and the first oil chamber 17 formed between the piston body 21 and the piston body 21 is pushed rearward by supplying hydraulic pressure from the oil passage 17a. It is provided so that it can be. The rear end of the piston 21 has a male screw portion 13a at the rear end of the pulling rod 13 at the axial center.
By engaging with the rod nut 21a that is screwed and fixed to, the tow rod 13 is retracted and carried when the first oil chamber 17 is retracted by the hydraulic pressure. Reference numeral 12 is a second oil chamber for moving the piston 21 forward, and the hydraulic pressure is supplied from the oil passage 12a to return the retracted piston 21 to the initial position side.

The pulling rod 13 has a third oil chamber 14 inside the rod, and a frame 21 fixed to the piston 21.
Only the pulling rod 13 can move forward along the guide rod 21c supported by b. If the hydraulic pressure in the third oil chamber is released, the piston 21 returns to its original state under its own weight. The third oil chamber 14 is provided for adjusting the engagement between the tip of the tow rod 13 and the fixing block 116 at the lower end of the cable.

The leading end of the tow rod 13 is provided so as to engage with the rear end surface of the fixing block 116.
Further, the annular block 15 having the first traction screw portion 15a formed on the outer periphery is fixed. The first towing screw portion 15a forms a screw portion that is continuous with the second towing screw portion 116c provided on the outer periphery of the fixing block 116, and the inner screw 16a extends across these screw portions.
The annular block 15 and the fixing block 116 are integrated by screwing a coupler having a.

In this example, a concave-convex loose fitting portion 30 is provided at the center of the front end of the tow rod 13 and the center of the rear end of the fixing block (in this example, the grout cap assembled to the fixing block) to guide the engagement thereof. I have to.

An example of the work of pulling the cable by assembling the above hydraulic jack device to the fixing block will be described. First, the annular block 1 at the tip of the pull rod 13 is first described.
5 and the fixing block 116 are engaged with each other, the shafts of the pulling rod 13 and the fixing block 116 are accurately aligned by fitting the concave and convex portions. Next, the coupler 16 is screwed to integrate the pulling rod 13 and the fixing block 116.

Thereafter, the first oil chamber 1 of the hydraulic jack device 9
The hydraulic pressure is supplied to 7 to retract the piston 21, thereby retracting the rod nut 21a and hence the traction rod 13.

By the retraction of the tow rod 13, the fixing block 116 integrated with the tow rod 13 by the coupler 16, that is, the lower end of the cable is towed and tensioned. Then, the fixing nut member 117 is fixed to the pressure bearing plate 1 so as to fill the gap between the pressure fixing plate 118 and the fixing nut member 117 generated by the movement of the fixing block 116.
The work is finished by screwing the screw until it hits 18 and removing the hydraulic jack device by the operation opposite to the above series of operations. In order to facilitate the above operation, it is preferable to provide a square shaft hole on the outer peripheral surfaces of the coupler 16 and the fixing nut member 117 so that a suitable jig can be fitted.

FIG. 12 and FIG. 13 show a working state in which the cable 103 is pulled and tensioned as described above, and its axis coincides with the fixing block 116 at the lower end of the cable installed in the state of FIG. So that the hydraulic jack device 9
In this state, as described above, (engagement of the chain 11 with the bearing plate)-(integral screwing of the tip of the pulling rod and the coupler 16 of the fixing block 116)-(cable by pulling rod) The pulling tension)-(threading of the fixing nut member) can be performed.

In this work, generally, several tens are used.
Towing with an extremely large force of 0t,
Further, since the hydraulic jack device 9 is also a device having a weight of several tons, if the continuity between the fixing block 116 and the towing screw portion of the annular block at the tip of the towing rod cannot be sufficiently ensured, the screwing operation of the coupler 17 will also be performed. Although not easy, according to the dolly of this example, the axial alignment of these can be easily ensured by operating the manual jacks 22 respectively arranged near the four wheels 2, the link mechanism, and the cylinder device. There is an advantage that you can.

The coupler 16 is attached to the fixing block 116.
In order to facilitate the work of screwing into the connector, for example, it is also preferable to provide the coupler with a fitting hole for mounting a rod-shaped jig in the radial direction.

Furthermore, in order to run the hydraulic jack device through the internal passage of the box girder, using a suitable winch device, the wire (not shown) is hooked on the hook 3 of the carriage and moved, It is also preferable to use an outrigger with a lateral movement wheel as described above to move the carriage from the internal passage to the position where the work of FIG. 4 is performed. When adopting such a method of moving the carriage in the lateral direction of the girder, the hydraulic jack device 9 is generally set in the state of, for example, FIGS. 12 and 13, and the carriage is moved in the lateral direction in this state. With this configuration, when the hydraulic jack device 9 is moved upward, a gap between the body parts of the tier 11 which is divided into two parts is provided with an appropriate size.
This is preferable because there is no risk of interfering with the fixing block. In order to easily perform such work, the device of this embodiment adopts a structure in which the chain 11 of the hydraulic jack device 9 is divided into two parts and the side surfaces are sufficiently spaced apart.

FIG. 13 shows the posture of the hydraulic jack device when the erection angles of the cables 103 are different.

[0054]

As described above, according to the cable tension bridge cable tensioning device of the present invention, the cable of the cable stayed bridge is tensioned inside the box girder structure or in the limited space on the suspension scaffold. Work or adjustment of tension is easy, especially for single-stay suspension cable-stayed bridges where it is extremely difficult to assemble a cable tension device from the outside of the box girder, regardless of the usage status of the bridge. Since the work can be realized, the effect is extremely large.

Further, in the cable tension device of the present invention and the cable-stayed bridge having the box girder structure suitable for using the tension device, the tension state of the cable is set at the time of construction of the cable-stayed bridge or after the construction. Work can be performed without providing scaffolding outside the girder, and therefore, work for assembling and dismantling the scaffolding, work for dangerous places, etc. is not required. It is possible to solve the extremely important problem in this kind of work, that is, to secure the safety of.

Furthermore, when it is necessary to adjust the tension of the cable after the construction, generally, the usage status of the cable-stayed bridge (for example, the traffic status of vehicles on a road bridge),
In order to ensure the safety of workers and the safety of passing vehicles, measures such as prohibition of traffic during the construction period will be taken, but in the cable-stayed bridge to which the tensioning device of the present invention can be applied, work required only inside the main girder Since it is possible to perform the above, there is not only the above-mentioned safety advantage that it is not necessary to perform the work at high places, but also the actual effect is great.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a fixing structure on a girder side of a cable that is strained by a cable tensioning device of the present invention.

FIG. 2 is a view for explaining a fixing structure on the main tower side of the cable.

FIG. 3 is an explanatory diagram showing an example of a configuration used for cable fixing in the fixing structure on the cable girder side of the cable shown in FIG. 1.

FIG. 4 shows an example of a trolley type cable tension device of the present invention,
It is the figure shown as a side view of the state where the link mechanism was folded.

5 is a left side view of the trolley type cable tensioning device of FIG. 4 and a view showing a relationship between the trolley and the internal passage of the box girder.

6 is a plan view of the trolley type cable tensioning device of FIG. 4. FIG.

7A and 7B are views for explaining an outrigger to be mounted on a bogie in this example, FIG. 7A is a side view thereof, and FIG. 7B is a front view thereof.

FIG. 8 is a diagram for explaining the relationship between the hydraulic jack device and the storage cylinder in this example.

FIG. 9 is a diagram for explaining a vertical movement mechanism and a tilting mechanism of the storage cylinder in the present example.

FIG. 10 is a view showing the internal structure of the hydraulic jack device of this example.

FIG. 11 is a perspective view showing the structure of a chain of this example.

FIG. 12 is a diagram showing an example of a state in which a cable is tensioned by the cable tensioning device of this example.

FIG. 13 is a diagram showing an application state when a cable installed at an angle different from that in FIG. 12 is tensioned.

FIG. 14 is a cross-sectional view of a girder of a cable-stayed bridge to which the present invention is applied in a longitudinal direction.

FIG. 15 is a view showing a girder of a cable-stayed bridge to which the present invention is applied, in a cross section (cross section orthogonal to the longitudinal direction).

FIG. 16 is a diagram showing an example of an overall outline of a cable-stayed bridge to which the present invention is applied.

[Explanation of symbols]

1 ... ・ Bogie 2 ・ ・ ・ ・ Wheels 3 ・ ・ ・ ・ Hooks 5,6,7 ・ ・
..Links, 8 ..., trunnions, 9 ... hydraulic jack devices, 10 ... hydraulic cylinder devices for retreating the whole body, 11 ... chiair, 12 ... first oil chamber, 13 ... Truck rods, 14
··· Second oil chamber, 15 ···, annular rod, 15a ··· Towing screw portion, 16 ···, coupler, 17 ··· Third oil chamber, 2
0 ... First piston, 21 ... Second piston, 22 ...
Manual jack, -23 ... Guide rod, 101 ...
Main tower, 102 ... Girder, 103 ... Cable, 112 ...
Through hole, 116 ... Fixing block, 116a ... Towing screw portion, 117 ... Fixing nut member, 118 ... Bearing plate.

Claims (9)

[Claims] 1. An anchoring block for tensioning a cable, which is provided at either end of the cable for tensioning a cable stretched between a tower and a girder of a cable-stayed bridge to a predetermined tension state. Pulling and tensioning the cable fixing portion of the girder in the extension direction of the cable, in this state, the nut member screwed into the fixing screw portion provided in the fixing block is abutted against the cable fixing portion of the tower or the girder. A cable tensioning device for fixing the cable end by screwing it up to a pulling rod provided so as to come into contact with the end of the fixing block and a cable side provided at the end of the fixing block. A first towing screw portion, a second towing screw portion provided on the towing rod side so as to be continuous with the first towing screw portion, and these first and second towing screw portions. By fixing the fixing block by screwing it over the screw part. And a coupler with a screw that links the tow rod so as to be integrally movable in the axial direction, a chain that abuts against a fixed portion of the tower or the girder against which the nut member abuts, and an extension of the cable with respect to the fixed portion of the tower or the girder A tensioning device main body which is spaced apart by the length of the chain, and a hydraulic mechanism which is provided in the tensioning device main body and forcibly moves the pulling rod in the cable tension direction. Cable tension device for cable-stayed bridge. 2. The cable fixing portion of the tower or the girder according to claim 1, wherein the nut member screwed to the fixing screw portion provided in the fixing block is abutted by screwing the nut member fixedly to the tower or the girder. A cable tension device for a cable-stayed bridge, which is an assembled bearing plate. 3. A support plate assembled to a tower or a girder for fixing a cable in a tensioned state according to claim 2,
The central axes of the pulling rod and the fixing block at the cable end are substantially aligned with the engagement surface of the chain that engages the tension plate to bring the tensioning device main body into a predetermined position / posture. A cable tension device for a cable-stayed bridge, which is provided with an uneven fitting portion. 4. The second concavo-convex fitting portion for causing the central axes of the fixing block at the cable end and the opposing surface of the pulling rod to substantially coincide with each other is provided at a central position of the fixing block at the cable end. Characteristic cable tension device for cable-stayed bridge. 5. The cable of a cable-stayed bridge according to claim 4, wherein a plurality of concavo-convex fitting portions for closely matching respective central axes of the fixing block and the pulling rod are provided on opposing surfaces of the fixing block and the pulling rod. Tension device. 6. The method according to any one of claims 1 to 5,
A cable tensioning device for a cable-stayed bridge, wherein the coupler is pre-threaded with a pulling screw portion on the pulling rod side or is pre-threaded with a fixing block side of the cable. 7. The method according to any one of claims 1 to 6,
The cable tensioning device for a cable-stayed bridge, wherein the tensioning device main body is coaxially provided with a tow rod and a hydraulic mechanism. 8. A trolley having a cable tensioning device according to claim 7, wherein the tensioning device main body is mounted via a vertical movement mechanism and a tilting mechanism. 9. The vehicle according to claim 8, wherein wheels for facilitating lateral movement of the vehicle in the traveling direction are provided at four corners of the vehicle in a removable manner. A trolley equipped with a cable tension device.