KR101150352B1 - Saddle system and cable for tension - Google Patents

Abstract

(Problem) Provided is a saddle structure capable of improving the water resistance at the end of a bundle covering of a multi-cable contained in an inner tube, and a tension cable for use as the multi-cable.
(Solution means) The inner tube 10 fixed to the main tower of the bridge, the multi-cable penetrated inside the inner tube, and the inner tube are filled in the inner tube through the inner tube through the inner tube through the inner tube ( 10. A saddle structure 1 having a filler (grout 40) to be fixed to 10. The multi-cable 30 has an alliance of the plurality of sheathed PC strands 30w, and a collective sheath 30c formed on the outer periphery of the alliance. The inner tube through portion of the multi-cable 30 includes an exposed portion 30e from which the collective coating 30c has been removed, a coating portion 30j adjacent to the exposed portion 30e and the collective coating 30c remains, and a filler. It has a water-expandable sealing agent which expands and contacts the edge part of the coating | coated part 30j by contact with the water contained in water.

Description

Saddle Structure and Tension Cables {SADDLE SYSTEM AND CABLE FOR TENSION}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a saddle structure provided on a main tower such as a cable-stayed bridge and an extradosed bridge, and a tension cable used in the structure. Particularly, in a saddle structure using a multi-cable in which collective coating is formed on an outer circumference of an alliance of a plurality of prestressed concrete strands, it is stored in an inner tube for attachment of a multi-cable and an inner tube. It is related with the saddle structure which can improve the water resistance in the edge part of the package | column sheath | cover of the multi cable in which only the part which was removed was improved.

Cable-stayed bridges and extra-dose bridges are known as bridges installed on trunk roads and railway tracks. These cable-stayed bridges and extra-dose bridges are configured to support the molds by a plurality of cables extending at an angle from the pylon arranged perpendicularly to the molds.

In the pylons of the above-mentioned cable-stayed bridges and extra-dose bridges, saddle structures are used. The saddle structure is configured to support the middle part of the cable to which the both ends are fixed to the mold at the main column part. As such a saddle structure, the saddle structure using a multi-cable is known (for example, patent document 1).

The multi-cable is a cable having an alliance of a plurality of sheathed PC strands and a collective sheath formed on the outer periphery of the alliance. Each coated PC strand is formed with a corrosion resistant coating on a stranded wire composed of a plurality of element wires.

The saddle structure using this cable has an outer tube embedded in a main tower made of reinforced concrete, and an inner tube disposed inside the outer facade. Both ends of the outer tube and the inner tube are drawn out to each side surface of the main column. Inside the inner tube a tensioned multi-cable is inserted. Among these multi-cables, the collective coating is partially removed at a portion that passes through the inner tube to form an exposed portion of the coated PC strand. In addition, a grout is filled in the inner tube, and the grout is cured to hold the coated PC strand and the inner tube of the exposed portion integrally.

In addition, a slide pipe is connected to the end of the inner pipe, and a rubber boot is attached to the end of the slide pipe. The rubber boots seal between the end of the slide pipe and the multi-cable to prevent the grout filling in the inner tube from leaking out of the end of the slide pipe before curing.

Then, the ring nut is screwed to the outer circumference of the inner tube, and the ring nut is fixed to the pressure plate fixed to the side of the main column. As a result, the tension acting on the multi-cable due to vibration of the mold is transmitted from the multi-cable to the main column through the grout, the inner tube, the ring nut, and the pressure plate.

Japanese Laid-Open Patent Publication No. 2008-169675 (Fig. 1)

However, in the saddle structure described above, further improvement is required in the indexability at the end of the collective coating at the location accommodated in the inner tube of the multi-cable.

In the above saddle structure, by connecting the slide pipe to the end of the inner tube and by attaching rubber boots to the end of the slide pipe, the grout filling in the inner tube is prevented from leaking from the gap between the end of the slide pipe and the multi-cable before hardening. Doing. By the way, in order to improve the adhesiveness of grout and a cable, the multi-cable in an inner pipe partially removes collective coating, and the end part of a collective coating exists. Therefore, before the grout filled in an inner tube hardens, there exists a possibility that the grout or grout | moisture | moisture may transfer between the bundle PC strands between each end of a collective coating, and between a collective coating and an alliance. In that case, since the strand of the cladding PC strand has an anticorrosive coating, and the outer periphery of the coalescence is wrapped with the collective coating, if the anticorrosive coating is sound, the corrosion resistance of the strand is not immediately affected. Since moisture is present inside, it is preferable to remove moisture which is a cause of corrosion.

This invention is made | formed in view of the said situation, One of the objectives is the saddle which can improve the index property in the edge part of the collective sheath of the multi-cable accommodated in an inner tube in the saddle structure using a multi-cable. To provide a structure.

Another object of the present invention is to provide a tension cable which is very suitable for constructing the saddle structure.

The saddle structure of the present invention is an inner tube fixed to a bridge column of a bridge, a tension cable, a multi-cable whose both ends are fixed to a mold of a bridge, and an intermediate portion of the saddle structure is filled in the inner tube, And a filler surrounding the inner tube through portion of the multi-cable and having a filler for fixing the through portion to the inner tube. In this structure, the multi-cable has an alliance of a plurality of sheathed PC strands and a collective sheath formed on the outer periphery of the alliance. In addition, the inner tube penetration portion of the multi-cable includes: an exposed portion in which the collective coating is removed to expose the union, a coating portion in which the collective coating surrounds the union, adjacent to the exposed portion, and water contained in the filler; It expands by contact and has a water-expandable sealing agent which indexes the edge part of the said coating part, It is characterized by the above-mentioned.

According to this structure, by having a water-expandable sealing agent, it is possible to prevent fillers such as grout from infiltrating into the coating part from the boundary between the exposed part and the coating part. In addition, by using a water-expandable sealing agent that expands by contact with moisture contained in the filler, even when the moisture of the filler reaches the end of the coating portion, the expansion of the sealing agent causes the gap between the bulk coating and each coated PC strand, At least one gap between each of the coated PC strands can be reduced or eliminated, and the progress of the filler into the coated portion can be more reliably suppressed.

In one embodiment of the saddle structure of the present invention, the coated PC stranded wire covers a plurality of stranded steel wires twisted together and an outer circumference of the stranded wires of these wired wires, and an anticorrosive coating filled between the respective wires. What is provided is mentioned.

According to this structure, since the corrugated PC stranded wire is formed not only on the outer periphery of element wire but also between each element wire, it can be set as the saddle structure which has high corrosion resistance.

As one form of the saddle structure of this invention, when the said coating PC strand has the said anticorrosive coating, this anticorrosive coating has many solid particles which adhere to the outer peripheral surface.

According to this structure, many solid particles can raise the frictional resistance of the anticorrosive coating surface, and can improve the adhesiveness of each coated PC strand and filler in the exposed part in an inner pipe | tube.

On the other hand, the tensioning cable of the present invention is a tensioning cable whose both ends are fixed to a mold of a bridge, and an intermediate part thereof is penetrated into an inner tube fixed to a bridge tower of a bridge, and is integrated with an inner tube by a filler filled in the inner tube. This cable has a coalescing body of a plurality of sheathed PC strands, a bulk sheath formed on the outer periphery of the coalescing body, and a sealing agent disposed locally between each of the sheathed PC strands and the sheathing. And the sealing agent is arrange | positioned in the place used as the edge part of a collective coating, when the said collective coating is removed and the coalescing body is exposed in the inner tube penetration part of a tension cable, and the water contained in the said filler It is a water-expandable sealing agent which expands by contact.

According to this structure, when using as a structural member of a saddle structure among tension cables, the sealing agent is arrange | positioned beforehand in the place which becomes an end part of a collective coating in an inner pipe | tube, In the site where a saddle structure is constructed, the collective coating is carried out. There is no need to construct an exponential structure near the end of the. In addition, this sealing agent can be reliably and easily filled not only between a batch coating and each PC strand, but also between each PC strand, by arrange | positioning inside a batch coating in the manufacturing process of a cable. .

In one embodiment of the tension cable of the present invention, the coated PC stranded wire includes a plurality of steel wires twisted together and an anticorrosive coating filled between the strands of the stranded wires and filled between the individual wires. Can be mentioned.

According to this structure, since the corrugated PC stranded wire is formed not only with the outer periphery of a wire but also between each wire, the saddle structure which has high corrosion resistance can be constructed by using this cable.

As one form of the tension cable of this invention, when the said coating PC strand has the said anticorrosive coating, this anticorrosive coating has many solid particles adhering to the outer peripheral surface thereof.

According to this structure, many solid particles can raise the frictional resistance of the anticorrosive coating surface, and can improve the adhesiveness of each coated PC strand and filler in the exposed part in an inner pipe | tube.

According to the saddle structure of this invention, the index property in the edge part of the collective sheath of the multi cable accommodated in an inner pipe | tube can be improved.

According to the tension cable of the present invention, it is possible to easily construct a saddle structure having improved exponential property at the end of the collective sheathing of the multi-cables accommodated in the inner tube without involving a workload.

1A is an overall configuration diagram of the saddle structure of the present invention according to the embodiment, and (B) is a partially enlarged view of the outlet portion of the saddle structure.
FIG. 2A is a cross-sectional view of a multi-cable used in the saddle structure of FIG. 1, and FIG. 2B is a cross-sectional view of a covered PC strand that constitutes the multi-cable.
It is a schematic view which shows the arrangement position of the water-expandable sealing agent of the multi-cable used for the saddle structure of FIG.

(Form to carry out invention)

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on drawing. Here, the case where the saddle structure of this invention is applied to the pylons of bridges, such as a cable-stayed bridge and an extra-dose bridge, is demonstrated as an example. These bridges are constituted by a mold extending substantially parallel to the ground, a column tower extending almost perpendicular to the mold, and an inclined cable (tension cable) extending from the tower to the mold. The cable used for this saddle structure is a multi-cable in which the alliance of the plurality of sheathed PC strands is wrapped in a sheath. In the following description, first, the entire configuration of the saddle structure will be described, and then each structural member will be described.

(Overview of overall configuration)

The saddle structure 1 has an outer tube 20 embedded in the main tower 200 of a bridge and an inner tube 10 disposed inside the outer tube 20 as main components, and is inserted into the inner tube 10. It is comprised so that the casting mold (not shown) of a bridge may be suspended by the multi cable 30 which passed through (FIG. 1 (A)).

The exterior 20 of the saddle structure 1 is embedded in the main column 200 made of reinforced concrete so that both ends thereof are opened to the opposite sidewall of the main column 200. On the outer circumference of the exterior 20, a reinforcing bar 70 for reinforcing the main column 200 along the longitudinal direction of the exterior 20 is disposed. In addition, a supporting plate 81 is disposed in the vicinity of the open end of the exterior 20 of the side wall of the main column 200 (FIG. 1B).

The inner tube 10 is disposed inside the outer casing 20, and is open to opposite side walls of the main column so that both ends thereof protrude from the outer casing 20. In addition, the inner tube 10 is fixed inside the outer tube 20 by the inner tube spacer 50. At this time, a gap is formed between the inner tube 10 and the outer tube 20, and the grout discharge hose 63 is inserted into the gap. In addition, a ring nut 80 is screwed to an outer circumferential surface of a straight tube portion 12 formed at an end of the inner tube 10, and the ring nut 80 is described above through a pressure regulating plate 85. The pressure plate 81 is held down.

The multi-cable 30 is inserted into the inner tube 10 and fixed to a mold (not shown) at both ends. The grout 40 (filler) is filled between the multi-cable 30 and the inner tube 10, and the multi-cable 30 and the inner tube 10 are integrated through the grout 40. As shown in FIG. Further, at the inner tube end portion (inner tube straight tube portion 12), the slide pipe 95 at the end of the straight tube portion 12 so that the grout 40 does not leak from the gap between the multi-cable 30 and the inner tube 10. Is screwed on, and at the end of the slide pipe 95 a rubber boot 96 is mounted.

Hereinafter, each structural member is demonstrated.

(cable)

  <Configuration>

  As shown to Fig.2 (A), the multi-cable 30 combines the alliance of several sheathed PC strands 30w by the strand which wrapped in the collective sheath 30c. In this embodiment, the coated PC stranded wire provided with the stranded wire which twisted the some wire 32 together, and the anticorrosive coating 34 which wraps the stranded wire is used (FIG. 2 (B)). More specifically, each elementary wire 32 is steel, and typically, 7 strands comprise a stranded wire. The anticorrosive coating 34 is made of, for example, an epoxy resin, and the outer periphery of the stranded wire is wrapped, and the resin is also filled between the element wires 32. Moreover, the twisted groove | channel between the element wires 32 is exposed in the outer surface of the anticorrosive coating 34, and many solid particle 36 is affixed. The solid particles 36 are for enhancing the adhesion between the coated PC strand 30w and the grout 40, and for example, silica sand or the like can be suitably used.

The coated PC strand 30w twists and joins a plurality of strands to form an alliance. As the number of strands of the coated PC strand 30w constituting the coalescence, for example, 12 strands, 19 strands, 27 strands, 37 strands, 48 strands, etc. may be mentioned. In FIG. 1, only some of the covered PC strands 30w are shown for convenience of explanation. In order to bring the cross-sectional shape of the other coalescing body closer to the circular shape, it is preferable to twist the interlace string 30i mainly outside the coated PC strand 30w. Polypropylene is mentioned as an example of the material of the interlace 30i.

On the outer circumference of the coalescing body, a tape wound layer (not shown) which suppresses scattering of the coated PC strand wire 30w and the interlacing string 30i is formed, and a collective coating 30c is formed outside the tape wound layer. . In this example, high density polyethylene is used as the material of the batch coating 30c.

And as shown in FIG. 3, the water-expandable sealing agent 30s is arrange | positioned at a part of the longitudinal direction of this multi-cable 30. As shown in FIG. In this example, this sealing agent 30s is arrange | positioned beforehand in the place used as the end part of the collective coating 30c in the inner pipe | tube 10, when the saddle structure 1 is constructed with the multi-cable 30. As shown in FIG. (FIG. 1). In the inner tube through portion of the multi-cable 30, the exposed portion 30e is formed by partially removing the collective coating 30c and exposing the coated PC strand 30w, and collectively covering both sides of the exposed portion 30e. The coating part 30j in which 30c is left is formed. The sealing agent 30s is arrange | positioned at the end used as the edge part of this coating | coated part 30j, ie, the end part of collective coating 30c. More specifically, at the position corresponding to the end of the collective covering 30c in the multi-cable 30, between the tape wound layer and each of the coated PC strands 30w and between each of the coated PC strands 30w. The sealing agent 30s is filled in between. This sealing agent 30s expands by contacting with the moisture of the grout 40 filled in the inner tube 10 to reduce or eliminate the gap between the tape wound layer and the mutual member of each coated PC strand 30w, Furthermore, sufficient hardening property in the edge part of the coating | coated part 30j is implement | achieved by hardening. A commercially available thing can be used for such a water expandable sealing agent 30s.

<Production method of the cable>

Such a multi-cable is manufactured as follows, for example.

A plurality of element wires 32 are prepared, and the element wires 32 are twisted together to form a stranded wire (FIG. 2). When forming the stranded wire, the long wires (duckling wood) are used to separate each wire 32, and in that state, an epoxy resin is powder-coated to form an anticorrosive coating 34. Then, before the epoxy resin is cured, the solid particles 36 are sprayed and adhered to the surface of the anticorrosive coating 34 so that a part of the solid particles 36 protrudes from the surface of the anticorrosive coating 34 and the remainder is anticorrosive. It is made to be embedded in the coating | cover 34.

Plural strands of the obtained coated PC strands 30w are joined together to form an alliance. At that time, since the length from the one end fixed to the mold to the other end reaching the mold via the saddle structure 1 of the pylon is already known as the design length, the saddle structure 1 ), It is determined which part of the multi-cable longitudinal direction becomes the end of the coating part 30j in the inner tube 10. Therefore, when forming a coalescing body, as shown to FIG. 1, FIG. 3, water-expandable seal | sticker with a predetermined width between each outer side and outer periphery of the covered PC strands 30w in the position used as the edge part of the covering part 30j. What is necessary is just to apply 30s of ring agents. More specifically, what is necessary is just to apply the said sealing agent 30s to each covered PC twisted line 30w in the state which twisted each covered PC stranded wire 30w. The width at which the water-expandable sealing agent 30s is disposed is assumed to be slightly different from the design dimension when the actual position serving as the end of the coating portion 30j is set to be about 20 to 50 cm in the cable length direction. good. In this example, this width is set to 30 cm.

Then, the multi-cable 30 can be obtained by forming a tape winding layer in the outer periphery of an alliance, and forming the collective coating layer 30c by extrusion further on it.

(Exterior)

The exterior 20 is not particularly limited as long as it has a predetermined strength and has good adhesion performance with concrete. In this example, a curved pipe made of high density polyethylene was used. The curvature of the external appearance 20 corresponds substantially to the curvature of the curved pipe part 11 of the inner tube 10 mentioned next.

(shell)

The inner tube 10 includes a curved tube portion 11 having a gentle radius of curvature and a straight tube portion 12 formed at both ends of the curved tube portion 11. The straight pipe portion 12 and the curved pipe portion 11 may be one continuous member or may be joined by welding or the like as a separate member. In addition, the material of the inner tube 10 is not particularly limited as long as it has a predetermined strength and has good adhesion performance with the grout 40. In this example, the inner tube 10 was produced by welding a forced curved tube and a straight tube.

The curved pipe portion 11 of the inner pipe 10 has the full length of the curved pipe portion 11 such that the cable 30 disposed therein is not bent so that excessive side pressure acts locally on the cable 30. It has a constant curvature over the whole length. In addition, the curvature of the bend 11 determines that the cable 30 is not bent below the allowable minimum bending radius so as not to impair the safety of the saddle structure 1.

The straight pipe portion 12 of the inner tube 10 is formed straight from both ends of the curved pipe portion 11. Therefore, the angle with respect to the horizontal line of the straight pipe part 12 is determined by the curvature of the curved pipe part 11. In this example, the boundary between the exposed portion 30e and the covering portion 30j exists in the straight pipe portion 12. That is, the multi-cable 30 in the slide pipe side end part of the straight pipe part 12 is set as the coating | coated part 30j in which the collective coating 30c exists. After construction of the saddle structure, bending is easy to be applied to the multi-cable 30 at the slide pipe side end of the straight pipe 12, but the multi-cage 30 positioned at the end thereof is left with a bulk sheath 30c. By the abdomen 30j, the fatigue resistance of the cable 30 can be improved.

(Grout and grout inlet, grout drain hose)

The grout 40 is for integrating the inner tube 10 and the cable 40 by being filled into the inner tube 10 and cured. The grout 40 may use a commercially available thing. The grout inlet 62 for filling the grout 40 into the inner tube 10 is connected to the slide pipe 95 at the outlet of the saddle structure 1, and the grout discharge hose 63 is provided. Is connected to an almost central portion of the curved pipe portion 11 of the inner tube 10 (FIG. 1A), and passes between the inner tube 10 and the outer tube 20 from the connection point thereof to form the saddle structure 1. It is withdrawn to the exit side of (FIG. 1B). The filling of the grout 40 into the inner tube 10 ends when the grout 40 is injected from the injection port 62 and the grout 40 is discharged from the discharge hose 63.

(Slide pipe and rubber boots)

The slide pipes 95 and the rubber boots 96 provided at both ends of the inner tube straight pipe portion 12 hold the grout 40 in the inner tube 10 until the grout 40 is cured, and the inner tube 10 It is to prevent leakage to the outside. The slide pipe 95 should just have predetermined strength, and the steel pipe (galvanized steel pipe) was used here. The slide pipe 95 is screwed to the end part of the straight pipe part 12 of the inner pipe 10, and the grout 40 does not leak from this screw connection part either.

In addition, the rubber boot 96 may use a well-known thing. The rubber boots 96 are composed of a narrow neck and a wide neck, and the wide neck covers the ends of the slide pipe 95, and the narrow neck covers a bundle of the multi-cables 30. 30c). The inner diameter of the large diameter part of the rubber boot 96 before installation is smaller than the outer diameter of the slide pipe 95, and the inner diameter of the narrow diameter part is smaller than the outer diameter of the collective coating 30c. Therefore, the clearance between the slide pipe 95 and the multi-cable 30 at the end of the slide pipe 95 can be sealed by the rubber boots 96, and the grout (from both ends of the inner pipe 10) can be sealed. 40) can be prevented from leaking.

(Ring nut, pressure plate)

The ring nut 80 is a member which is screwed to the outer circumference of the inner tube straight pipe 12 to transmit the tension acting on the cable 30 to the side wall of the main column. Moreover, the pressure plate 81 is a plate-shaped member which is embedded so that the surface may be exposed to the side wall of the main tower 200, and receives the tension | pulverization which acts on the cable 30 via the ring nut 80. As shown in FIG.

(Pressure throttle)

The pressure regulating plate 85 is a member for filling the gap formed between the ring nut 80 and the pressure plate 81 when the ring nut 80 is screwed to the straight pipe portion 12. In the center of the pressure regulating plate 85, a through hole through which the inner tube straight pipe portion 12 can be inserted is formed. In this example, two taper plates were piled up together and used as the pressure regulating plate 85. The tapered plate is a steel thin plate of which one surface is flat and the other surface is an inclined surface. That is, when the taper plate is seen from the side, one end part is thick and the other end part is thin taper shape. In this example, the thickness was changed by overlapping each other so as to face the inclined surfaces of the two tapered plates, and rotating the original plate. The surface of the tapered plate is preferably subjected to Teflon (registered trademark) processing or the like so that the inclined surface is easily slipped.

In the peripheral portion of the tapered plate, a screw hole 85s capable of attaching a screw (for example, a fixed screw with a hexagonal hole) is formed. By attaching a screw to this screw hole, this screw can protrude radially outward of a taper plate. By operating the screw which protrudes radially outward of a taper plate, the taper plate clamped between the ring nut 80 and the pressure plate 81 can be rotated easily. Moreover, the relative rotation degree of two taper plates can be confirmed easily by confirming the position of the screw hole 85s.

(Reinforcement)

The reinforcing bar 70 is a member used to enhance the strength of the main column 200. The reinforcing bar 70 used a commercially available thing. In the saddle structure 1 of this example, the reinforcing bar 70 was arrange | positioned in the spiral shape surrounding the full length of the external appearance 20. As shown in FIG.

(Formation method of saddle structure)

In order to form the saddle structure 1 as described above, the inner tube 10 is disposed inside the exterior 20 at the factory, and both ends of the inner tube 10 are opened at the opposite side walls of the main tower 200 at the construction site. do.

Next, among the multi-cables 30, the collective sheath 30c of the part which penetrates in the inner pipe | tube 10 is partially removed, and the exposed part 30e by which the coating PC stranded wire 30w was exposed is formed (FIG. 1). (B)). Since the water-expandable sealing agent 30s is arrange | positioned in the position used as the edge part of the coating part 30j previously only by removing this collective coating 30c, application | coating of this sealing agent 30s is used as a field work. There is no need to do it.

Subsequently, the multi-cable 30, which previously inserted the slide pipe 95 and the rubber boots 96, is inserted into the inner tube 10 and tensioned, and the predetermined position of the mold not shown at both ends of the cable 30 is tensioned. To settle in.

In addition, the slide pipe 95 is screwed to the end of the inner tube 10, the rubber boots 96 are attached to the end of the slide pipe 95, and the inner tube 10 is sealed.

Then, after the cable 30 is tensioned, the grout 40 is injected into the inner tube 10 by using the grout inlet 62 of the slide pipe 95 and the grout discharge hose 63 connected to the inner tube 10. Thus, the cable 30 and the inner tube 10 are integrated. When the grout 40 reaches the end of the coating portion 30j by the injection of the grout 40 and contacts the water-expandable sealing agent 30s, the sealing agent 30s expands and hardens to be avoided. An index of the abdominal end is performed.

Then, the ring nut 80 is screwed to the outer circumferential surface of the straight pipe portion 12 of the inner tube 10, and the ring nut 80 is fixed to the pressure plate 81 via the pressure regulating plate 85.

(Action effect)

Since the water-expandable sealing agent 30s is arrange | positioned at the edge part of the coating | coated part 30j among the multi-cables 30 which penetrate into the inner pipe | tube 10, the collective coating 30c and the covered PC strand 30w, It is possible to sufficiently index the gap between and between the coated PC strands 30w. Moreover, since this sealing agent 30s expands by contacting with the moisture contained in the grout 40, even if a clearance exists in the application location of the same sealing agent 30s before grout filling, even if it exists with the water, By expanding by contact, the gap can be filled and high index performance can be obtained.

Since each coated PC strand 30w has not only the outer periphery of the stranded wire which consists of the strand 32 of a covering, but also the anticorrosive coating 34 filled with resin between each strand 32, the saddle structure which has high corrosion resistance You can do

In addition, since the twisted grooves of the element wire 32 are exposed on the surface of the anticorrosive coating 34, a large number of solid particles 36 are attached, so that the grout 40 and the coated PC strand 30w are formed. Adhesion can be improved.

This invention is not limited to said embodiment, A various change can be added.

The saddle structure and tension cable of the present invention can be suitably used for a cable-stayed bridge, an extra-dose bridge, and the like.

1: saddle structure
10: inner tube
11: bend
12: straight pipe
20: appearance
30: multi cable
30w: sheathed PC strand
32: wire
34: anticorrosive coating
36: solid particles
30c: bulk cloth
30i: lanyard
30s: water expandable sealing agent
30e: exposed part
30j: covering part
40 grout
50: inner tube spacer
62: grout inlet
63: grout drain hose
70: rebar
80: ring nut
81: acupressure plate
85: pressure control plate
85s: screw hole
95: Slide Pipe
96: rubber boots
200: pylon

Claims (10)

Inner tube fixed against the pylon of the bridge,
A tension cable comprising: a multi-cable whose both ends are fixed to a girder of a bridge, and an intermediate part is penetrated inside the inner tube;
A saddle structure comprising a filler that is filled in the inner tube and surrounds an inner tube through portion of the multi-cable and fixes the through portion to the inner tube,
The multi cable,
An alliance of a plurality of covered PC strands,
In a part of the longitudinal direction of this coalescing body, it has the collective coating | cover formed so that the outer periphery of the coalescing body may be carried out,
The inner tube through point of the multi-cable is
An exposed portion in which the union is exposed from the bulk coating,
Adjacent to this exposed portion, a covering portion in which the collective covering surrounds the union,
A saddle structure, comprising: a water-expandable sealing agent that expands upon contact with moisture contained in the filler to exponentially end the coating portion. The method of claim 1,
The cladding PC strand,
A plurality of twisted wires,
A saddle structure characterized by covering the outer periphery of strands of these strands and having a corrosion resistant coating between each strand. The method of claim 2,
The anticorrosion coating of the cladding PC strand has a plurality of solid particles attached to its outer circumferential surface. A tension cable in which both ends are fixed to a mold of a bridge, an intermediate part is penetrated in an inner tube fixed to a bridge tower of a bridge, and is integrated with an inner tube by a filler filled in the inner tube,
Alliance of plural sheath PC strands,
A batch covering formed to cover the outer periphery of the union in a part of the longitudinal direction of the union;
It has a sealing agent arrange | positioned locally between each coating PC strand and a collective coating,
The sealing agent,
It is arrange | positioned in the place used as the edge part of the said bundle coating among the inner pipe penetration places of the tension cable,
And a water-expandable sealing agent that expands by contact with moisture contained in the filler. The method of claim 4, wherein
The cladding PC strand,
With the twisted wire of the plural forced together,
A tension cable which covers the outer circumference of stranded wires of these wires and is provided with anticorrosive coating filled between the wires. The method of claim 5,
The anticorrosion coating of said cladding PC strand has a plurality of solid particles attached to the outer circumferential surface thereof.
Inner tube fixed against the pylon of the bridge,
A tension cable comprising: a multi cable whose both ends are fixed to a mold of a bridge, and an intermediate part is penetrated inside the inner tube;
A method of forming a saddle structure comprising a filler that is filled in the inner tube and surrounds an inner tube through portion of the multi-cable and fixes the through portion to the inner tube.
Twisting a plurality of wires to form an alliance of the sheathed PC strand, and collectively forming a sheath covering the outer periphery of the alliance to form a multi-cable,
Arranging the inner tube such that both ends of the inner tube open on opposite side walls of the main column,
Partially removing the collective covering of the portions penetrating into the inner tube of the multi-cable, forming an exposed portion in which the union is exposed from the collective covering, and a covering in which the collective covering surrounds the union, adjacent to the exposed portion;
Inserting the multi-cable into the inner tube and tensioning it;
When forming the multi-cable, a water-expandable sealing agent which expands by contacting with water contained in the filler and expels the end of the coating part is previously applied to a portion that becomes the end of the coating part. Forming method. The method of claim 7, wherein
A method of forming a saddle structure, wherein the water-expandable sealing agent is applied to each of the coated PC strands in a state in which the coated PC strands are unwound when the multi-cable is formed. A method of manufacturing a tension cable, wherein both ends are fixed to a mold of a bridge, the intermediate part is penetrated into an inner tube fixed to the main column of the bridge, and is integrated with the inner tube by a filler filled in the inner tube.
Twist a plurality of wires to form an alliance of clad PC strands,
To form a tension cable to form a sheath covering the union,
Before forming the bulk sheath, the number of the tension cables that expands by contacting with water contained in the filler to a portion that becomes the end of the batch sheath when the bulk sheath is partially removed from a portion that penetrates into the inner tube. A method of producing a tension cable, characterized by pre-application of an expandable sealing agent. 10. The method of claim 9,
A method for producing a tension cable, comprising applying the water-expandable sealing agent to each coated PC strand in such a state that the coated PC strand is twisted.

Images