JPH0978525A - Suspending method and suspending device for diagonal member cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate suspending work by suspending and supporting the suspension chute of an upper opening on a guide rope suspended between a main tower side and a bridge girder side, feeding a strand in sequence from one end side of the chute, and guiding it to the other end side. SOLUTION: Each strand is suspended into the through hole of a fixing section 2a via a suspension chute 4 suspended between the fixing sections 2a so that the strand can be stretched and extracted from an opening section. When a lead body is fitted at the tip section of the strand, the release of the strand from the chute 4 is prevented by the lead body even when the strand is warped and bent when it passes through the chute 4. The whole suspension chute 4 is flexibly warped between the fixing section 2a on the main tower 2 side of a diagonal suspension bridge 1 and the fixed section 2a of a bridge girder 3 side. An unreasonable load by the weight of the strand at the head/tail connection portion of the single chute is excluded, and the work efficiency can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable laying method and a erection device used in the method for laying, for example, a diagonal cable of a cable-stayed bridge in a fixing portion between a main tower and a bridge girder. .

[0002]

2. Description of the Related Art Conventionally, as a conventional method for constructing a cable cable in a cable-stayed bridge or suspension bridge, a guide wire is installed in advance between the main tower side of the cable-stayed bridge and the anchor portion on the bridge girder side. The hoisting wire is movably suspended on the guide wire, and a rustproof erection sheath, which is a cylindrical tube made of synthetic resin, is erected between the main tower side and the fixing part on the bridge girder side with the hoisting wire. For example, there is known a method in which a plurality of strands of PC steel wire or PC steel stranded wire is inserted from the main tower side, tensioned and fixed by the anchor heads of the both fixing portions, and a rust preventive material is grouted in the erection sheath. ing.

Further, as a conventional example, first, the first strand in a multi-strand diagonal cable in which each strand is covered with a protective material such as polyethylene is erected between the fixing portions on the main tower side and the bridge girder side. Then, it is tensioned and used as a substitute for the guide cable, and then it is suspended on the first strand by a guide cage formed by a plurality of small cables, U bolts, and a dolly, and a pulling cable and a special dolly, etc. The head of the subsequent strand is hooked with, and the tensile cable is wound up with a winch to pull the subsequent strand from the bridge girder side to the main tower side, the strand head is removed from the carriage, and the anchor head of the fixing unit The guide cage, and then fix it with a fixing member such as a wedge and erect it with a jack or the like, and then remove the guide cage. The method is known (JP-A-6
-299517).

[0004]

However, in the conventional example, since a plurality of strands are inserted into the rust-proof erection sheath, the inside of the erection sheath becomes more congested and difficult to be inserted as the number of inserted strands increases. There is an inconvenience such as twisting in the erection sheath and mistakenly corresponding portions when passing through the through hole of the anchor head of the fixing portion, and it is troublesome to grout the erection sheath.

Further, in the above-mentioned conventional example, the formation of the induction cage is not easy, and each strand is pulled up from the bridge girder side to the main tower side by the pulling cable, so that the heavy strand is loosened between the U bolts, and the pulling up is performed. It cannot be said that it is suitable for erection of a long diagonal cable due to increased load.In addition, it is a high place on the main tower side that the head of the pulled-up strand is removed from the carriage and inserted into the anchor head of the fixing part. There is a problem that it takes time to work.

As described above, the conventional method for laying a diagonal cable has a problem to be solved in terms of easiness of erection work.

[0007]

The gist of the method for constructing a diagonal cable according to the present invention for solving the above-mentioned problems is to provide a plurality of strands between a fixing portion on the main tower side and a fixing portion on the bridge girder side. In the method of tensioning the diagonal cable, the guide rope is erected between the fixing portions of the main tower side and the bridge girder side, and the guide rope is hung and supported by the guide means having an upper opening. That is, the strands are sequentially supplied from one end side of the guide means and guided to the other end side.

Then, by tensioning the strand between the both fixing portions, the strand is pulled out from the upper opening of the guide means and installed, and the strand from the opening portion of the guide means is attached to the tip of the strand. Mounting a leading conductor for preventing the strand from coming off; further, the leading conductor is provided with an indicator portion projecting from the opening of the guide means and indicating the movement position of the strand tip portion; Inserting the guide means from the fixing portion on the tower side to the fixing portion on the bridge girder; the guide means is a tubular body, and the longitudinal cross-sectional shape thereof is a tapered portion forming an upper opening, and a lower portion. Of the rectangular portion, and is regulated so as not to move upward in the rectangular portion even when the strand is wavy when the strand is inserted.
Then, the width of the opening of the guide means is formed smaller than the outer diameter of the leading conductor and larger than the diameter of the strand, and when the strand is inserted into the guiding means, the leading conductor is cut from the opening. To prevent the strand from slipping out, and to allow the strand to slip out from the opening after inserting the strand into the guide means; the guide means is an erection chute in which unit chutes of a required length are continuously connected. That is, each single chute is rotatably attached to the lower end portion of the suspension supporting means so that it can follow the bending of the guide rope.

The gist of the diagonal cable erection device according to the present invention is a erection device for laying a cable between both fixing parts of a main tower and a bridge girder, and a guide installed between the both fixing parts. It is composed of a rope and an erection chute supported on the guide rope by suspending and supporting means, and an opening for pulling out a strand is provided on an upper part of the erection chute.

The erection chute is a tubular body, and its longitudinal cross-sectional shape is formed by a tapered portion forming an upper opening and a lower rectangular portion; and the opening of the erection chute. The width of the portion is formed to be smaller than the outer diameter of the leading conductor attached to the end of the strand and larger than the diameter of the strand; and the erection chute is a single chute having a required length. That is, the attachment means is provided so as to be rotatably attached to the lower end portion of the suspension supporting means, and the attachment means is provided below the end portion in the longitudinal direction of each unit chute.

According to the method for constructing the diagonal cable according to the present invention, each of the strands constituting the diagonal cable is surely made to correspond to the through hole of the fixing portion by the guide means which is provided between both fixing portions. It can be erected and can be easily pulled out from the opening provided in the upper part of the guide means by pulling and tensioning the strand. Therefore, since it is not a erection method in which a large number of strands are inserted into one erection sheath, there is no stranding of the strands in the sheath, and the work efficiency is improved.

Further, by attaching a front conductor to the tip of the strand to be inserted into the guide means, even if the strand is bent and gently bent while the strand is passing through the guide means, The tip conductor does not come out of the guide means.

Further, since the lower portion of the longitudinal section of the guide means is also rectangular, the movement of the strand is restricted upward even if the strands are wavy during insertion into the erection chute, and the strand itself is removed from the opening of the erection chute. I can't get out.

Since the single chute constituting the erection chute as the guide means is rotatably attached to the lower end portion of the hanging support means, the erection chute as a whole can be flexed flexibly between both fixing portions. Therefore, it is possible to prevent an unreasonable load from being applied by the weight of the strand at the connecting portion of the single chute.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a method for constructing a diagonal cable according to the present invention will be described in detail with reference to the drawings. In the first embodiment of the present invention, as shown in the schematic configuration in FIGS. 1 to 3, for example, between the fixing section 2a on the main tower 2 side of the cable-stayed bridge 1 and the fixing section 3a on the bridge girder 3 side. A cylindrical erection chute 4 as a guide means for the strand is installed.

The erection chute 4 is provided with the both fixing portions 2
Between the a and 3a, a guide rope 5 which is erected in advance by being connected to the anchor body a and the like, and a suspension in which a required plurality of pieces are suspended movably via the U-shaped shackle 6 on the guide rope 5. By the hanging metal fitting 7 of the supporting means and the pulling wire 8 which is bridged at the upper part of each of the hanging metal fitting 7, the lower end portion of the hanging metal fitting 7 is rotatably connected by the mounting means of the erection chute. The pulling wire 8 is pulled up from the bridge girder 3 side to the main tower 2 side and installed.

The erection chute 4 is constructed by connecting light weight single unit chutes 9 successfully. The structure of the single unit chute 9 will be described.

As shown in FIGS. 4 to 6, the unit chute 9 has a main body 9a made of metal (for example, stainless steel).
The whole is a long and slender tubular shape (for example, about 2 m), and the opening 9b is provided in the upper part thereof along the longitudinal direction.

As shown in FIG. 5, the lower portion of the main body 9a is formed in a rectangular cross section, and a taper portion 9c is provided from the rectangular upper end to form the opening 9b.

As shown in FIGS. 4 and 5, one end of the main body 9a is provided so as to project from the end face, and the upper end of the adjacent single chute 9 is guided and received in a thick U-shape. The metal guide receiving plate 10 is fixed by welding or the like, and further, an L-shaped metal connecting plate 11 is welded to the lower surface of the guide receiving plate 10 in alignment with the end surface of the guide receiving plate 10 on the protruding side. A metal reinforcing plate 12 that is fixed by means such as the above, and is brought into contact with the end surface of the guide receiving plate 10 on the side of the main body 9a to maintain the shape of the cylindrical main body 9a is fixed by means such as welding.

The connecting plate 11 is provided with penetrating mounting holes 11a and 11b for inserting bolts in its hanging portion.

As shown in FIGS. 4 and 6, the other end of the main body 9a serves as a connecting member for connecting the connecting plate 11 and a reinforcing member for maintaining the shape of the cylindrical main body 9a. The reinforced connecting plate 13 is fixed to the main body 9a by means such as welding.

Further, under the reinforcing connecting plate 13, mounting slits 13a and 13b are provided at positions corresponding to the mounting holes 11a and 11b of the connecting plate 11.

The upper opening 9b of the unitary chute 9 is formed along the longitudinal direction of the main body 9a over the entire length thereof, and the width of the opening 9b corresponds to the strand 15 to be installed between both fixing portions. The size is set to be larger than the diameter and smaller than the outer diameter of the spherical leading conductor 14 described later.

The unitary chute 9 thus formed
7 to 10, the upper position side and the lower position side are set to the top side and the ground side, respectively, as shown in FIG. 7 to FIG. , (The side shown in FIG. 7A) and the top side of the other single chute 9 (for example, the side shown in FIG. 7B) so that the ground side of the single chute 9 is placed on the guide receiving plate 10. Mating.

Then, the connecting plate 11 and the reinforcing connecting plate 1 which are in contact with each other by the bolt 16 and the wing nut 17 are attached.
3 mounting holes 11a, 11b and slits 13a, 1
Pass through 3b to temporarily fix.

On the ceiling side of the single chute 9, the lower end portion 18a (horizontal bar portion in the case of suspension) of the metal suspending metal 7 which is suspension supporting means is locked to the bent portion of the connecting plate 11, As shown in FIGS. 9 to 10, the metal stopper plate 19 is made to pass through the head portion of the bolt 16 through the through holes 19a, 19a provided on the lower side with a hole diameter larger than the head portion of the bolt 16. Further, the wing nut 17 is tightened by sliding it toward the mounting holes 19b, 19b having a hole diameter corresponding to the diameter of the bolt portion, and the connecting plate 11, the reinforcing connecting plate 13, and the stop plate 19 are fastened. .

In this way, the attachment means for rotatably attaching to the lower end portion of the suspension metal fitting 7 of the suspension support means is constituted by the upper part of the stop plate 19 and the connecting plate 11, and is a rectangular space. The lower end portion 18a of the hanging metal fitting 7 is loosely fitted in the hole, and the unit chute 9 is rotatably set to the lower end portion 18a of the hanging metal fitting 7.

In addition, the lower end portion 18a of the hanging metal fitting 7 is attached to the ceiling side of the other single chute 9 and the stopper plate 19 and the bolt 16 are provided.
-The wing nut 17 is temporarily locked, and then the ground side of one of the single chutes 9 is fitted. In that case, the slit 13a of the reinforcing connecting plate 13 on the ground side causes the ground side to swing from above. It is preferable in connection work to tighten the wing nut 17 by tightening the wing nut 17 while keeping in mind that the wing nut 17 can be fitted into the bolt portion of the bolt 16 by inserting it between the nut 17 and the reinforcing connecting plate 13. is there.

Then, the hanging metal fitting 7 as a hanging support means.
As shown in FIGS. 11 to 12,
A main body portion extending from one end side of a horizontal rod-shaped lower end portion 18a in a suspended state to an upper portion, and further, an upper portion of the main body portion is bent horizontally, and is vertically erected at a tip end portion thereof for welding or the like. The hanging metal fitting 7 is formed from the flat plate member 18b fixed by.

The lower end portion 18a is provided with through holes 18c, 18c for inserting a warp pin or the like for preventing the single chute 9 from coming off in the horizontal direction at a required interval, and the flat plate member 18b is provided with A through hole 20 for inserting the bolt of the shackle 6 is provided on the upper side, and a through hole 21 for inserting the bolt 23 when fixing the locking member 22 with the bolt 23 and the nut 24 is provided on the lower side. There is.

Then, below the through hole 21, the flat plate body 1 is formed.
A protrusion 25 is provided on one surface of 8b, which serves as a rotation preventing means for the latch member 22 around the axis when the bolt is tightened.

As shown in FIG. 12, the latch member 22 has a through hole 22a for inserting a bolt in the central portion thereof.
A semicircular recess 22b for holding the pulling wire 8 is provided on one side, and a protrusion 22c is provided on the lower side on the same side as the recess 22b.

Therefore, as shown in FIG. 12A, the bolt 23 is passed through the through hole 21 of the flat plate 18b to penetrate the through hole 22a of the stopper member 22, and the pulling wire 8 is formed between the recess 22b and the flat plate 18b. The pull-up wire 8
The hanging metal fitting 7 is fixed to the. Also, the protrusion 2
Even if the stopper member 22 tries to rotate in the tightening direction when the nut is tightened, the lower end portion of the stopper member 22 comes into contact with the stopper member 22 to prevent rotation.

Then, as shown in FIG. 13, a bolt for the shackle 6 hung on the guide rope 5 is inserted into the through hole 20 of the flat plate member 18b, and the hanging metal fitting 7 moves relative to the guide rope 5. It can be suspended freely.

Next, the leading conductor 14 attached to the tip of the strand 15 will be described. The lead conductor 14
As shown in FIG. 14, is a metal sphere, and a screw hole is formed in a part of the sphere, and a bolt 26 having a locking head portion 26a protrudes the bolt portion to the outside. A screw 27 that is loosely mounted and that engages with the head portion 26 a of the bolt 26 is screwed into the screw hole of the lead conductor 14 so that the bolt 26
It will keep you from falling out.

A metal cap 28 is covered on the tip of the strand 15 and fixed by a hexagonal screw 29. The front conductor 14 is attached to the front end of the strand 15 by screwing the threaded portion of the bolt 26 of the front conductor 14 into the screw hole 28a formed in the center of the front end of the cap 28.

By means of the construction chute 4 connecting the unitary chute 9 as the guide means, the hanging metal fitting 7 of the hanging support means, and the front conductor 14 attached to the end of the strand, which is constructed as described above, for example, a cable-stayed bridge. A method of constructing the diagonal cable of No. 1 will be described.

First, as shown in FIGS. 1 to 3, a guide rope 5 and a pulling wire 8 are installed between a fixing portion 2a on the main tower 2 side of the cable-stayed bridge 1 and a fixing portion 3a on the bridge girder 3 side. .

One end side of the pulling wire 8 is attached to the winch, and the other end side, that is, the bridge girder 3 side is provided with the shackle 6, the hanging metal fitting 7, and the stop member 22, which are necessary bolts, wing nuts, and nuts, respectively. Etc. are prepared, and the hanging metal fitting 7 is hooked on the pulling wire 8 and hung on the guide rope 5.

Next, the lower end portion 18a of the hanging metal fitting 7 is engaged with the ceiling side of the single chute 9 to attach the stopper plate 19 to the connecting plate 1.
1 is temporarily tightened with a bolt 16 and a wing nut 17, and further, a warp pin is inserted into the through holes 18c, 18c of the lower end portion 18a and hooked. As a result, the single chute 9 is rotatably attached to the hanging metal fitting 7.

The next stage (lower side in the erection direction)
To attach the single chute 9, the pulling wire 8 is pulled up to the main tower side by the length of the single chute 9 (about 2 m) with a winch.

Next, the hanging metal fitting 7 is hung on the guide rope 5 as described above, and the ceiling side of the next single chute 9 is rotatably attached to the lower end portion 18a of the hanging metal fitting 7.

Then, on the top side of the next single shot 9,
The ground side of the preceding single chute 9 is fitted.
The ground-side reinforcing connecting plate 13 of the single chute 9 is inserted from above between the wing nut 17 on the top side and the connecting plate 11 of the next-stage single chute 9 to fully tighten the wing nut 17. As shown in FIG. 8, adjacent single chutes 9 and 9 are connected.

In this way, the hanging metal fitting 7 is attached to the hanging metal fitting 7 by a single chute 9.
Attach the wire 8 along the guide rope 5
While pulling up to the main tower side, the continuous connection of the single unit chute 9 is repeated, and as shown in FIG. 1 to FIG. 3, the erection chute 4 as the guide means is installed between both fixing portions 2a and 3a. As will be described later, the opening 9b of the erection chute 4
Since the strands 15 are pulled out of the fixing chute 4, it is preferable that the erection chute 4 is erected so as to be positioned obliquely below between the fixing portions 2a and 3a.

Next, the strand 15 to be erected from the take-up drum 30 on the bridge girder 3 is fed out, and the strand 15 is extruded by the pushing machine 31, and is guided along the guide pipe 32 to the fixing portion 2a on the main tower 2 side. Strand 1
Supply 5.

Then, the through hole 2b of the fixing portion 2a on the main tower side
After inserting the strand 15 into the strand 15, the front conductor 14 is attached to the tip of the strand 15 via the cap 28 and the bolt 26 (see FIG. 14).

Next, as shown in FIG. 2, the strand with the leading conductor 14 at the top is inserted through the end face opening on the ceiling side of the erection chute 4 erected between the fixing portions 2a and 3a.

Then, as shown in FIG. 15A, when the front conductor 14 and the tip of the strand 15 come out from the end face opening of the lowermost stage of the erection chute 4, the front conductor 14 is removed from the strand 15. , Is inserted through the through hole of the fixing portion 3a on the bridge girder side, and hooked by a known means such as a half wedge.

Also in the fixing section 2a on the main tower side, the strand 15 is hooked by the known means such as the wedge, and the strand 15 is cut so as to be separated from the strand on the supply side.

After that, the strand 15 is tensioned by a tensioning means such as a jack, whichever is closer to the main tower side or the bridge girder side. Then, Figure 15 (b)
As shown in, the strands 15 sequentially come out from the upper opening 9b formed continuously along the longitudinal direction of the erection chute 4.

After that, the strands 15 that have all come out of the erection chute 4 are tensioned and fixed. And again,
While supplying the cut supply-side strand 15 from the winding drum 30 to the through-hole 2b of the fixing unit on the main tower side, the strand 15 is inserted into the through-hole of the fixing unit, and the tip conductor 14 is attached to the leading end of the through-hole 2b. Repeat the same erection work as above to fix both fixing units 2
A required number of strands 15 are installed between a and 3a.

When the strands 15 are inserted through the erection chute 4, as shown in FIGS.
Since the outer diameter of 4 is larger than the width of the opening 9b, there is no risk of slipping out of the opening 9b during movement in the erection chute 4, and the strand 15 can be tensioned and lifted upward after insertion. By doing so, it is possible to escape from the opening 9b.

Further, even if the strand 15 is unexpectedly undulated while the strand 15 is being inserted into the erection chute 4, the lower portion of the main body 9a of the single chute 9 is formed in a rectangular shape. Therefore, since only the collision with the vertical side wall does not cause the action of moving upward along the curved surface, the upward jump of the strand 15 is prevented, and the strand 15 is erected from the opening 9b. There is no danger of getting out while passing through.

The erection chute 4 is provided with a guide rope 5
Since a single chute 9 rotatably attached to a plurality of hanging metal fittings 7 hung on the bridge is successfully connected, the guide rope 5 laid on the main tower 2 side and the bridge girder 3 side is shown in FIG. As described above, it is inevitable that the erection chute 4 is bent downward, but the erection chute 4 can also be flexed as a whole by following this, and erection is facilitated. Further, even while the strand 15 is being inserted into the erection chute 4, an unreasonable load due to the weight of the strand is not applied to the connecting portion of the single chute at the succession.

Next, the second embodiment of the present invention is different from the first embodiment in that an index portion 33 is provided on the leading conductor 14, as shown in FIG.

In the indicator portion 33, a standing member 34 is planted on the top of the leading conductor 14, the tip of the standing member 34 is projected from the opening 9b of the erection chute 4, and, for example,
A spherical indicator portion 33 is provided. Since the indicator portion 33 is for confirming the position of the leading conductor 14,
Anything that can be visually recognized by the operator, for example,
It may be a flag or the like, and the shape is not particularly limited.

According to the second embodiment as described above, when the strand 15 is inserted into the erection chute 4 and moved to the bridge girder side, the operator during the erection work can confirm the tip position of the strand 15. Therefore, it is possible to judge whether the supply of the strand 15 is adjusted or not, and further the work safety is ensured.

Although the third embodiment of the present invention is not shown in the drawings, in the procedure of the erection work from the position of the shortest diagonal cable to the position of the longest diagonal cable, for example, the shortest diagonal cable is used. After laying a plurality of strands at the position of, the guide rope 5, the pulling wire 8 and the laying chute 4 already laid between the main tower side and the bridge girder side are laid for the next upper diagonal cable laying. As it is, it is lifted up and diverted, and the erection chute for which the length is insufficient is to be erected on the bridge girder side by adding the single chute 9 with the hanging metal fitting 7, and then the strand 15 is added to the erection chute 4 having the above length. It is a method of erection of a diagonal cable that is inserted and carried out.

On the contrary, the erection work is started from the position of the longest diagonal cable, and the lower diagonal cables are sequentially erected, and the extra length of the erected chute 4 is diverted. It is also possible to adopt a method of erection of a diagonal cable in which the erection work is carried out to the position of the diagonal cable having the shortest length while dismantled and removed. In this way, the work of constructing the construction chute 4 can be shortened and efficiency can be improved.

[0061]

As described above, in the method for constructing the diagonal cable according to the present invention, the diagonal cable composed of a plurality of strands is tensioned between the fixing portion on the main tower side and the fixing portion on the bridge girder side. A guide rope is erected between the main tower side and the bridge girder side fixing portion, and a guide means having an upper opening is suspended from the guide rope and supported from one end side of the guide means. Since the strands are sequentially supplied so as to be guided to the other end side, there is an excellent effect that the strands are guided by the guide means without any complication between the strands and the erection work can be performed efficiently. Further, since the strand is inserted through the guide means that is installed between both fixing portions and is installed, the strand does not loosen due to its weight during the installation, and there is an excellent effect that the installation work is smooth. .

Further, since the strand is pulled out from the upper opening of the guide means by tensioning the strand between the both fixing portions, the strand is erected and thus closed like the erection sheath in the conventional erection work. It is possible to eliminate the intricacy between the strands caused by inserting the plurality of strands into the tubular body, and to improve the erection work efficiency by eliminating the guide means of the present invention.

Further, by attaching a leading conductor to the tip of the strand to prevent the strand from slipping out of the opening of the guide means, there is no risk of the strand standing up from the guide means during the erection work, and Since the leading conductor is provided with an index portion that projects from the opening of the guide means and indicates the moving position of the strand tip, the operator can confirm the insertion state of the strand,
This has an excellent effect that it becomes easy to judge whether the supply of the strand is adjusted and the work safety is secured.

The guide means is a cylindrical body having a vertical cross-sectional shape formed by a tapered portion forming an upper opening and a lower rectangular portion, and when the strand is inserted, the strand is wavy. Since the rectangular portion is also regulated so as not to move upward, the strand is prevented from falling off from the guide means during the erection work, and after the insertion of the strand, the strand can be pulled out from the guide means and erected. It has an excellent effect that it becomes possible.

The diagonal cable erection device according to the present invention is
A erection device for laying a cable between both fixing portions of a main tower and a bridge girder, the guide rope being erected between the both fixing portions, and an erection chute supported on the guide rope by suspension supporting means. Since an opening for pulling out the strand is provided in the upper portion of the erection chute, it is possible to dismount the strand from the erection chute after the strand is bridged between both fixing parts by the erection chute. As a result, it has an excellent effect that multiple strands do not get complicated.

Since the erection chute is a tubular body and its longitudinal cross-sectional shape is formed by the taper portion forming the upper opening and the lower rectangular portion, the corrugation of the strands is generated during the erection work. Even if it occurs, the upward movement of the strand is prevented by the rectangular portion, and the strand does not fall off from the erection chute, and the reliability of the erection work is improved.

Since the width of the opening of the erection chute is smaller than the outer diameter of the leading conductor attached to the end of the strand and larger than the diameter of the strand, the erection chute of the strand being erected is It has an excellent effect that it can be prevented from falling off and that the strand can be pulled out from the erection chute and erected after the insertion.

The erection chute is constructed by connecting unit chutes of a required length to each other, and is rotatably attached to the lower end of the suspension supporting means below the end of each unit chute in the longitudinal direction. Since the mounting means is provided, the erection chute can be easily erected between both fixing portions, and the erection chute is also appropriately deflected according to the bending of the erected guide rope, so that the single chute is connected to the tail connecting portion. It has an excellent effect that no unreasonable load is applied.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an outline of a cable erection state according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an outline of a cable installation state according to the first embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of both fixing units (the middle is omitted) on the main tower side and the bridge girder side in the cable erection state according to the first embodiment of the present invention.

FIG. 4 is a front view of a single chute.

FIG. 5 is a left side view of the single chute.

FIG. 6 is a right side view of the single chute.

FIG. 7 is a ground side perspective view (a) and a top side perspective view (b) of the single chute.

FIG. 8 is a partial front view showing a state in which the single chutes are successfully connected.

FIG. 9 is a front view of a stop plate at a portion where the single shoots are connected to each other successfully.

FIG. 10 is an explanatory view showing a state in which a wing nut is fastened to a part of the back side of the stop plate of the neck connecting portion of the single chute.

FIG. 11 is a front view (a) and a side view (b) of the hanging metal fitting.

FIG. 12 is an explanatory view (A) showing a state of being fixed to a pulling wire with respect to an upper part of the hanging fitting, a vertical cross-sectional view (B) of the stopping member, and a front view (C) of the stopping member.

FIG. 13 is an explanatory view showing an enlarged part of an implementation state of the erection method according to the first embodiment of the present invention.

FIG. 14 is a vertical cross-sectional view showing a structure of a leading conductor attached to a tip of a strand in the erection method according to the first embodiment of the present invention.

FIG. 15 is an explanatory view (a) and (b) showing a erected state of the erection method according to the first embodiment of the present invention.

16 (a) and 16 (b) are explanatory diagrams (a) and (b) for explaining the escape of the erection chute, the lead conductor and the strand in the erection method according to the first embodiment of the present invention.

FIG. 17 is an explanatory view showing the erection method according to the second embodiment of the present invention.

FIG. 18 is an explanatory diagram of a case where a diagonal cable is installed on a cable-stayed bridge.

[Explanation of symbols]

 1 cable-stayed bridge, 2 main tower, 2a, 3a anchorage part, 3 bridge girder, 4 erection chute, 5 guide rope, 6 shackle, 7 hanging metal fittings, 8 pulling wire, 9 single chute, 9b opening part, 9c taper part, 10 Guide receiving plate, 11 connecting plate, 12 reinforcing plate, 13 reinforcing connecting plate, 14 leading conductor, 15 strands, 19 stopper plate, 22 hooking member, 33 indicator portion, 34 standing member.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akiyoshi Suzuki, 3-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Within ESE Co., Ltd. (72) Inventor Taku Minagawa 6-3-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo In stock company S 72 (72) Inventor Watashi Ohashi 6-3 Nishi-Shinjuku, Shinjuku-ku, Tokyo Within S E stock company (72) Inventor Masamitsu Takei 1 Shinhamacho, Chuo-ku, Chiba-shi, Chiba Inside Kawatetsu Techno Wire Co., Ltd. (72) Inventor Shigeo Shoji 1 Shinhamacho, Chuo-ku, Chiba, Chiba Prefecture, Kawakawa Techno Wire Co., Ltd. (72) Inventor Kimio Mine 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Co., Ltd. 72) Inventor Shigeki Nakamura 2-3 2-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Co., Ltd. Tokyo head office

Claims (12)

[Claims] 1. A method of tensioning and installing a diagonal cable consisting of a plurality of strands between an anchoring portion on the main tower side and an anchoring portion on the bridge girder side, the anchoring on the main tower side and the bridge girder side A guide rope is installed between the parts, a guide means having an upper opening is suspended and supported on the guide rope, and strands are sequentially supplied from one end side of the guide means and guided to the other end side. The method of erection of diagonal cable. 2. The method for laying a diagonal cable according to claim 1, wherein the strand is pulled out from the upper opening of the guide means by tensioning the strand between the both fixing portions to lay the strand. 3. The method for constructing a diagonal cable according to claim 1, wherein a tip conductor for preventing the strand from coming out of the opening of the guide means is attached to the tip of the strand. 4. The method for constructing a diagonal cable according to claim 3, wherein the leading conductor is provided with an index portion that projects from the opening of the guide means and indicates a movement position of the strand tip. 5. The method for constructing a diagonal cable according to claim 1, wherein the strand is inserted through the guide means from the fixing portion on the main tower side to the fixing portion on the bridge girder side. 6. The guide means is a tubular body having a vertical cross-sectional shape formed by a taper portion forming an upper opening and a lower rectangular portion, and there is a waviness of the strand when the strand is inserted. The method for constructing a diagonal cable according to claim 1, wherein the rectangular portion is regulated so as not to move upward. 7. The width of the opening of the guide means is formed to be smaller than the outer diameter of the lead conductor and larger than the diameter of the strand, and the lead is passed through the opening when the strand is inserted into the guide means. The method for constructing a diagonal cable according to claim 3, wherein the body is prevented from falling out, and the strand can be pulled out from the opening after the strand is inserted into the guide means. 8. The guide means is an erection chute in which unit chutes of a required length are continuously connected, and each unit chute is rotatably attached to a lower end portion of the hanging support unit,
The method for constructing a diagonal cable according to claim 1, wherein the bending of the guide rope can be followed. 9. A erection device for laying a cable between both fixing portions of a main tower and a bridge girder, wherein the guide rope is erected between the both fixing portions, and a suspension supporting means is provided on the guide rope. An apparatus for constructing a diagonal cable, comprising: a supported chute, and an opening for pulling out a strand is provided on an upper part of the chute. 10. The erection chute is a tubular body, and its longitudinal cross-sectional shape is formed by a tapered portion forming an upper opening and a lower rectangular portion.
The diagonal cable erection device described in. 11. The width of the opening of the erection chute is formed to be smaller than the outer diameter of the leading conductor attached to the end of the strand and larger than the diameter of the strand. The diagonal cable erection device described in. 12. The erection chute comprises unitary chutes of a required length which are continuously connected, and is rotatably attached to the lower end of the suspension supporting means below the longitudinal end of each unitary chute. The diagonal cable erection device according to claim 9, wherein the attachment means is provided.