JPH0436204B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for supporting strands in a spray saddle of a structure using parallel cable strands, such as a long suspension bridge.

(Prior art) As shown in Fig. 5, the main cable 1 of a suspension bridge using parallel cable strands has a diameter of 50 to 300.
It is made up of strands of books tied together, and each strand is made up of 90 to 200 steel wires with a diameter of about 5 mm.

The strands that make up the main cable 1 are
It is deployed radially through the spray saddle 3 installed above as shown in FIGS.
One cable is fixed to the cable anchor frame 4 fixed to the cable anchor frame 4.

FIG. 9 shows the strand 6 stored in the saddle 5 of the spray saddle. The strands are usually bundled into a roughly hexagonal shape, but when they are inserted into a spray saddle, they are formed into a rectangular shape as shown in FIG. 9, and are separated by the inner wall of the saddle and a vertical spacer 7. They are stacked neatly in the groove.

As mentioned above, when the strand passes through the spray saddle, it is spread out radially and fixed to the cable anchor frame, so that the inner wall and bottom surface of the saddle of the spray saddle form an arc as shown in FIGS. 6 and 7. It is curved. The vertical spacer 7 is also curved in an arc shape with a predetermined radius, and its thickness gradually changes, so that the groove in the saddle portion in which the strand is accommodated extends oriented in a predetermined direction.

As each strand passes through the spray saddle, it gradually separates from the other strands adjacent to the left and right due to the tension generated by being anchored at a predetermined anchor point. (This is called horizontal separation) It also separates from other vertically adjacent strands. (This is called vertical separation) That is, when looking in the direction of the cable anchor frame from the spray saddle side, the individual strands are radially spread out toward each anchoring point of the cable anchor frame.

Since the strand is bent into an arc while maintaining tension in the saddle of the spray saddle, the strand receives a force directed toward the center of the arc and pressed against the inner wall surface of the saddle, the bottom surface, or the vertical spacer. . Since the strand is a bundle of steel wires, when subjected to such force, the rectangular shape tends to lose its shape.

In conventional suspension bridges, the position of the anchoring point of the cable anchor frame is designed so that horizontal separation of the strands first occurs, and then vertical separation occurs within the saddle of the spray saddle. Therefore, even if the strand is pressed against the wall by a horizontal force and tries to lose its shape, it is restrained by other vertically adjacent strands, making it difficult to cause the strand to lose its shape.

However, as the scale of the suspension bridge increases and the number of strands used increases, the range of placement of strand anchoring points increases, and the structure of the cable anchor frame also increases. If an attempt is made to avoid increasing the size of the anchor frame due to economic reasons or topographical regulations, the placement of anchorage points will also be constrained, and the vertical separation of the strands will precede the horizontal separation within the saddle of the spray saddle. There are cases where this occurs.

At this time, the strand loses its shape, and at the same time, horizontal separation occurs. When the horizontal force generated at this time acts on the vertical spacer, the vertical spacer is displaced in the horizontal direction, and as shown in FIG. 10, the width of the groove between adjacent vertical spacers tends to be narrowed.

Conventionally, there has been no means to prevent narrowing of the groove width between the spacers due to such deformation of the vertical spacers.

As shown in FIG. 11, the vertical spacer 7 is vertically continuous according to the total height of the 8 groups of strands, and is also arranged so as to extend in the longitudinal direction of the strand group over the entire length of the spray saddle. A strand 8 is disposed in a groove partitioned between horizontally adjacent vertical spacers 7. In order to prevent the vertical spacers from deforming, it is conceivable to fit a rectangular plate with an appropriate thickness equal to the groove width into the groove between the spacers as a horizontal spacer, but for the purpose of adjusting the strands, etc. If it moves in the longitudinal direction, there is a risk that the rectangular plate will shift and move accordingly.

(Means for Solving the Problems) The present invention attempts to solve these problems by installing vertical spacers in the longitudinal direction within the saddle of a spray saddle of a suspension bridge or the like that uses parallel cable strands. A horizontal spacer in the form of a plate or wedge plate is placed between the upper and lower cable strands and has an engaging portion for the plate surface of the vertical spacer and the end surface of the gap in the longitudinal direction of the strand. , the strands are stacked in a groove partitioned by the vertical spacer, and the purpose is to stack the strands in the vertical direction due to the horizontal force of the parallel cable strands within the saddle in the spray saddle. An object of the present invention is to provide an improved method for supporting a cable strand in a spray saddle, in which deformation of the spacer is prevented and the lateral spacer is difficult to come off even if the strand moves in the longitudinal direction.

(Function) As described above, in the present invention, a vertical spacer is placed in the saddle of a spray saddle of a suspension bridge or the like using parallel cable strands along the longitudinal direction of the strands over the entire length of the spray saddle, as in the conventional case. The strands are not disposed continuously, but are disposed intermittently, and have locking portions for the plate surfaces of the vertical spacers and the end surfaces of the gaps in the longitudinal direction of the strands formed between adjacent spacers. A plate-shaped or wedge-shaped horizontal spacer is used, and the horizontal spacer is sandwiched between the upper and lower cable strands, so that each strand is stacked in the groove partitioned by the vertical spacer.
Horizontal displacement of the vertical spacer due to a horizontal force that is applied when the strand loses its shape and becomes horizontally separated is prevented by the horizontal spacer that is engaged with the plate surface of the spacer.

Furthermore, when the cable strand is moved in the longitudinal direction for the purpose of adjustment or the like, there is a risk that the horizontal spacer may catch on the end surface of the gap in the longitudinal direction of the strand in the vertical spacer, causing the horizontal spacer to shift as the strand moves. There is no.

(Effects of the Invention) As described above, according to the present invention, the vertical spacers are disposed intermittently in the longitudinal direction, and
Using a horizontal spacer having a locking part for the plate surface of the spacer and the end surface of the longitudinal cavity of the strand, and stacking the horizontal spacer between the upper and lower cable strands in the groove partitioned by the vertical spacer. This prevents deformation of the vertical spacer due to the horizontal force of the parallel cable strand in the saddle of the spray saddle, and also prevents the horizontal spacer from shifting following the cable strand even if the cable strand moves in the longitudinal direction. It is possible to prevent it from coming off,
Furthermore, the horizontal spacer can be easily installed by one person in a short time by being inserted into the cable strand using the gap in the longitudinal direction of the strand formed between the adjacent vertical spacers. It is possible.

(Example) The present invention will be described below with reference to the illustrated embodiments.

In FIG. 1, 11 is a vertical spacer, which is disposed intermittently in the longitudinal direction of the cable strand within the saddle of the spray saddle.

12 is a plate-shaped or wedge-shaped horizontal spacer;
Vertical spacers 1 provided at both front and rear ends
A locking portion 12b for the end face of the strand longitudinal cavity formed between adjacent vertical spacers 11 in the vertical spacer 11 protrudes from both sides of the intermediate portion of the pair of locking portions 12a for the plate surface of the vertical spacer 11. It is set up.

When the cable strands 13 are accommodated in the grooves partitioned by the vertical spacers 11, the cable strands 13 are placed opposite each other across the strand longitudinal gap 14 formed between the longitudinally adjacent vertical spacers 11. There are locking portions 12a, 12a in the groove portions, respectively.
The horizontal spacer 12 is sandwiched between the upper and lower cable strands 13 so that each strand 1
3 are stacked in the front raised groove.

The adjacent horizontal spacers 12 sandwiched between the cable strands 13 accommodated in the grooves adjacent to each other in the width direction of the spray saddle are connected to the respective front and rear locking portions as shown in FIG. 12b, 12b
By arranging them so that they are oriented in the same direction, adjacent horizontal spacers 12 do not interfere with each other.

According to the illustrated embodiment, as described above, the front and rear locking portions 12a of the horizontal spacer 12 are held between the upper and lower cable strands 13 stacked and housed in the groove partitioned by the vertical spacer 11.
is locked to the plate surfaces of the vertical spacers 11 facing each other across the groove, so that the vertical spacers 11 are prevented from being deformed by horizontal force.

Furthermore, even if the cable strand 13 moves in the longitudinal direction for adjustment or the like, the locking portion 12b on the side of the horizontal spacer 12 locks with the end face of the vertical spacer 11 facing the cavity 14, so that the horizontal spacer The strands 12 do not follow the strands 13 and do not shift.

Note that upward movement of the lateral spacer 12 can be inhibited by using appropriate fixing metal fittings or resin around the spacer.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various designs without departing from the spirit of the present invention. .

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the method for supporting cable strands in a spray saddle according to the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a side view thereof, and Fig. 4 is a horizontal spacer. Figure 5 is a front view of a suspension bridge using parallel cables.
Fig. 6 is a plan view showing a part of the spray saddle in cross section, Fig. 7 is a side view showing a part thereof in longitudinal section, Fig. 8 is a view taken along the direction of the arrow in Fig. 7, and Fig. 9 10 is a vertical side view showing the state in which the cable strand is housed in the saddle of the spray saddle, FIG. 10 is a vertical side view showing the deformation of the vertical spacer due to the horizontal force of the cable strand, and FIG. 11 is the side view of the conventional spray saddle. FIG. 3 is a perspective view showing a method of supporting cable strands. DESCRIPTION OF SYMBOLS 11...Vertical spacer, 12...Horizontal spacer, 12a, 12b...Locking part, 13...Cable strand, 14...Gap part.

Claims (1)

[Claims] 1 In the saddle of a spray saddle of a suspension bridge, etc. that uses parallel cable strands, vertical spacers are disposed intermittently in the longitudinal direction, and the plate surfaces of the vertical spacers and the gaps in the longitudinal direction of the strands are A spray saddle characterized in that a plate-shaped or wedge-shaped horizontal spacer having an engaging portion for an end face is sandwiched between upper and lower cable strands, and each strand is stacked in a groove partitioned by the vertical spacer. How to support cable strands in