JPS595721B2 - Hanger retraction device for constructing stiffening girders on long suspension bridges - Google Patents

Description

[Detailed Description of the Invention] The present invention connects the cable stretched between the tops of the main towers and the supplementary material installed between the lower parts of the main towers using cables hanging from the cables during the construction work of long suspension bridges. This invention relates to a hanger retraction device for erecting replenishment girders.

As shown in Figure 1, which is a schematic diagram of the long suspension bridge under construction, the bridge consists of a main tower 2 erected on a foundation 1, a cable 3 stretched between the tops of the adjacent main tower 2, and a cable 3. The main part of the construction is composed of a auxiliary material 5 suspended from a plurality of hanger ropes 4, and a construction method called the successive stiffening method is the basic construction method for the construction of the auxiliary material 5. Toshi 1 Hiro (adopted)

In this construction method, a plurality of hanger ropes 4 set to a predetermined length are hung from a cable 3 in advance, and a supplementary material 5 and hanger ropes 4 are hung from the main tower or an existing supplementary material 5 side with a crane or the like. While joining the lower ends of the main towers, the construction is progressed sequentially toward the center between adjacent main towers 2, as shown by arrow A in the figure.

In this case, in order to connect the lower end of the hanger rope 4 and the stiffening girder 5, a hanger drawing device is used, which pulls the cable 3 and the stiffening girder 5 together.

FIG. 2 shows a conventional hanger retracting device, FIG. 2A is a schematic diagram of a temporary hanger type retracting device, and FIG.

First, in Figure a, the cable 3 has /・Nga rope 4
is suspended in an inverted U-shape, and sockets 6 are firmly fixed to both lower ends thereof.

At a position adjacent to the hanger rope 4, a retraction device 10, which is composed of a suspension girder 1 above the cable 3, a retraction girder 8 above the stiffening girder 5, and a temporary hanger 9 that connects both girders 1°8, is installed. It is connected to the girder 5 by a retractable jack 11.

The figure shows the state where the retracting has been completed, and the retracting jack 11 is pulling the retracting tool 10 downward, and the hanger rope 4 is inserted into a hole provided in the stiffening girder 5, and its socket 6 is positioned below the hole. protrudes to.

After pulling the cable 3 and the stiffening girder 5 together in this way, insert the fixing metal fitting 12 with a larger diameter than the hole between the socket 6 and the stiffening girder 5, and return the retracting jack 11 slightly. , the socket 6 is crimped onto the stiffening girder 5 via the fixing fitting 12, and the connection is completed.

After this, the retracting jack 11 is further extended to release the retracting tool 1 10 from the cable 3, and the retracting tool 10 and jack 11 are sequentially disassembled, moved, and assembled, and the above operations are repeated to construct the stiffening girder 5. You can proceed.

However, in such a conventional retracting device, the temporary hanger 9 is extended when the retracting tool 10 is pulled by the retracting jack 11, and the hanger rope 4 is extended by the load N after being connected. Since the load is generally proportional to the amount of retraction, the stroke and load of the retraction jack 110 become large, and not only does the retraction jack 11 and the temporary hanger retraction become significantly larger, but the retraction tool 10 However, each member 7, 8, 9 becomes large in size due to the large load acting thereon, and the overall equipment cost increases significantly.

Also, each time you move the retracting tool 10 and the retracting jack 11, you have to work on a scaffold near the cable 3 which is located at an extremely high position, or you have to move the scaffold because it gets in the way. Furthermore, as the construction progresses, the length of the temporary hanger 9 must be gradually shortened, as shown in FIG.

Next, in the case shown in the figure, the retraction tool 10 shown in Fig. a is not provided, and the retraction jack 11 is attached to the reaction girder 13 fixed below the stiffening girder 5, and the retraction A rod 14 is connected to the socket 6.

The figure shows the end of retraction, with the retraction jack 11 pulling the hanger rope 4 downward, and the socket 6 protruding downward from the hole in the stiffening girder 5.

After this, by inserting the fixing metal fitting 12 and returning the retracting jack 11 in the same way as shown in Figure a, the fixing metal fitting 1
C. fixing is completed by crimping the socket 6 to the stiffening girder 5 via 2 and removing the retraction rod 14 from the socket 6.

However, in this method, the lower part of the stiffening girder 5 generally has a complicated structure and there are many obstacles, and it is often not only practically impossible to install the reaction force girder 13 or the retraction jack 11, but even if it is However, there was a drawback that the entire device became extremely large and the cost for reinforcing the bridge body increased.

The present invention was made in view of the above points, and the reaction girder detachably fixed below the stiffening girder and the retractable girder provided above the stiffening girder are connected by a retractable jack, and the retractable girder and A socket is fixed to the lower end of the hanger rope that hangs down through the insertion hole with the stiffening girder so that it protrudes below the stiffening girder when it is pulled in, and a push-in sleeve is positioned between the pull-in girder and the socket to attach the hanger rope to the hanger rope. A fixing fitting that is fitted and at least partially detachable from the push-in sleeve;
When the hanger rope is drawn in, it is positioned between the stiffening girder and the socket, and is fitted into the push-in sleeve, and when the hanger is drawn in, the push-in sleeve and socket, which descend together with the draw-in girder, are first pushed into the insertion hole of the stiffening girder. After that, by inserting the fixing metal fitting between the socket protruding from the insertion hole and the stiffening girder and fixing it at ℃, it is possible to create a pull-in jack with a small stroke and a hanger rope holder without using a temporary hanger pull-in tool. In addition, the work around the main cable and below the supplementary girder can be omitted, reducing the capacity of the retracting jack, and the This is a retracting device for hangers used to erect supplementary girders on long suspension bridges, which adjusts the parallelism between the supplementary girder and the retractable girder, which tilt during retraction, by connecting them with a telescopic connecting device, thereby smoothing the retracting operation. This is what we provide.

Embodiments of the present invention will be described in detail below with reference to the drawings.

3 to 7 show an embodiment of the hanger retracting device for constructing a replenishment girder according to the present invention, FIG. 3 is a partially cutaway front view thereof, and FIG. 4 is a view from B in FIG. 3. Figure 5 is a composite view of the cross-sectional view of the cable rope and the CC cross-sectional view,
FIG. 6 is a plan view of the tip end of the push-in sleeve, the reinforcing washer, and the fixing washer, and FIG. 7 is an explanatory diagram of the operation.

When it is necessary to explain the structure and operation of the entire suspension bridge, the first
This will be explained using figures.

In these figures, a pair of reaction force girders 21 are detachably fixed to the lower surface of the supplementary material girder 5, and a total of four retraction jacks 22 are attached to both ends of each reaction force girder 21. 23
It is formed so that it can be attached and detached by inserting and removing it, and its lower end is pivotally supported.

Each retraction jack 22 is equipped with a piston rod 24 that moves upward and back, and has a pin 25 at its working end.
A retractable girder 26 is pivotally supported, and is formed to be detachable by inserting and removing.

This retractable girder 26 is integrally formed with a rectangular box-shaped side plate 26a and a pair of girders 26b formed into a rectangular tube shape by removably connecting both ends of the side plate 26a, and is provided inside each girder 26b. A pair of rope grooves 27 are provided in the U-shape and open inward.

On the other hand, as shown in FIG. 1, a large number of hanger ropes 4 whose fulcrums are fixed with rope bands are suspended from the cable 3 at a predetermined length as shown in FIG. 6 is fixed.

The four hanger ropes 4 are engaged with each rope groove 27, and a push-in sleeve 28 is inserted between the girder 26a and the socket 6.

The pushing sleeve 28 engages with a rope groove 29 formed in a 5U shape and opening outward in the supplementary material girder 5 when being pulled in, and has a corner having a diameter smaller than that of the rope groove 29. It is formed in a cylindrical shape, and is formed in half so that it can be attached to and detached from the hanger rope 4, and is connected with bolts 30.

What is indicated by the reference numeral 31 is a fixing metal fitting, and in this embodiment, it is formed of a fixing washer 32 and a reinforcing washer 33, which are provided separately. It's hanging out on Hunger Rope 4.

Further, the fixing washer 32 is formed in a U-shape so that it can be attached to and removed from the push-in sleeve 28, and when pulled in as shown by the chain line in FIG. It is configured to be fitted together with the reinforcing washer 33 to stop the hanger rope 4 from moving.

The hanger retracting device configured as described above is provided with a corner bending adjustment device 34.

That is, as shown in FIG. 1, when the replenishment girder 5 is tilted, the angle between it and the hanger rope 4 changes, and a force acts to bend the piston rod 24 of the retraction jack 22. By pulling the retractable girder 26 in the opposite direction, the hanger rope 4 is bent and the retractable jack 22 operates smoothly.

This corner bend adjustment device 3. NζIt is formed by a pulley 35 pivotally connected to the retracting girder 26, a pulley (not shown) pivotally connected to the supplementary agent girder 5, and a rope 36 stretched between these two pulleys, and is connected to the retracting girder 26. It is telescopically connected to the agent girder 5.

Further, on the upper surface of the girder 26b of the retractable girder 26, a bending packing 37 is provided with a tapered hole for guiding the bending hanger rope 4.
is pasted.

Note that a hydraulic cylinder mechanism can also be used as the corner bending adjustment device 34.

The retracting operation by the hanger retracting device configured as above will be explained.

As shown in the figure, the retracting device is assembled and fixed around the four hanger ropes 4 to be retracted, and the hanger ropes 4 are inserted from the inside into the rope groove 27 of the retracting girder 26 and engaged, and the corner bending adjustment device 34 ropes 36 are tensioned.

Then, when the piston rod 24 of the retraction jack 22 is contracted and the retraction spar 26 is lowered, the spar 26b of the retraction spar 26 is moved toward the push-in sleeve 28 by the tension of the cable 3.
Since the push-in sleeve 28 and the hanger rope 4 with the socket 6 are pressed down together.

When the socket 6 has passed through the rope groove 29 of the supplementary spar 5, the push-in sleeve 28 is inserted from the outside into the rope groove 29 of the supplementary spar 5 and engaged, resulting in the state shown in FIG. The fixing washer 33 is fitted into the small-diameter cylindrical portion 28a of the push-in sleeve 28 that protrudes downward from the groove 29, resulting in the state shown in FIG.

Then, when the piston rod 24 of the retracting jack 22 is extended, the fixing washer 33 comes into contact with the lower surface of the replenisher spar 5 after it is slightly extended, thereby locking the movement of the socket 6 and the hanger rope 4 integrated therewith. By further extending the piston rod 24, the retractable girder 2
6 rises and returns to the position shown in the figure, and the push-in sleeve 28 becomes detachable without being crimped in the axial direction, so the port 30 is loosened and the push-in sleeve 28 is removed as shown in FIG. 7C. Remove.

After this, pull out the pins 23 and 25 and retract the jack 22.
At the same time, the rope 36 is loosened, and the side plate 26a and the girder 26b of the retractable girder 26 are uncoupled and removed.

Also, remove the reaction force girder 21. Then, the disassembled hanger retracting device is assembled around the next four hanger ropes 4, and the retracting operation is continued by repeating the above operation.

In the retracting operation performed as described above, the provision of the push-in sleeve 28 allows the socket 6 to be pushed down via this push-in sleeve 28, so the retraction jack 22 is provided above the replenishment girder 5. At the same time, the stroke is just enough for the socket 6 to cross the replenisher girder 5 (and the retracting jack 22 can be of small capacity).

Therefore, the retractable girder 26 may be located at a low position slightly above the supplementary material girder 5, and the work of erecting and relocating the scaffolding becomes much easier compared to the conventional structure provided above the cable 3.

In addition, since only the reaction force girder 21 is provided below the supplementary material girder 5, there is less risk of interference with the truss of the supplementary material girder 5.
Easy to relocate.

Furthermore, since the corner bending adjustment device 34 is provided, by expanding and contracting this to adjust the position of the retracting girder 26, the piston rod 24 of the retracting jack 22 can be adjusted correctly with respect to the supplementary material girder 5 while bending the hanger rope 4. Since they can be orthogonal to each other, the operation of the retraction jack 22 is not hindered.

In this embodiment, the fixing fitting 31 is replaced with the fixing washer 3.
2 and the reinforcing washer 33, the reinforcing washer 3
If the inner diameter of 3 is made small so that it fits snugly with the bunga cable 4, the small diameter cylindrical part 2B of the push-in sleeve 28
Even if the diameter is made small, the lower end of the push-in sleeve 28 will not sink into the upper end surface of the socket 6 in the gripping portion of the rope 4, which is generally made of an alloy softer than steel.

In addition, by making the lower end of the push-in sleeve 28 smaller in diameter, the hole diameter of the fixing washer 32 can be made smaller, and therefore the contact surface between the fixing washer 32 and the reinforcing steel girder 5 can be increased, so that the fixing effect is increased. increases.

However, it is not necessary to provide the reinforcing washer 33 (
, the fixing fitting 31 may be formed of only the fixing washer 32 which is detachable.

In addition, in this embodiment, the push-in sleeve 28 is formed in a half-shape so that it can be attached and detached from the hanger rope 4, but if it is formed into a cylindrical shape or the like, it can be buried as it is without being attached or detached for each pulling operation. Nishimata is also good.

Further, the retraction jack 24 may be turned upside down and the working end of the piston rod 240 may be pivoted to the reaction force beam 21 side.

Furthermore, the hanger ropes 4 may be pulled in two at a time, instead of four at a time as in this embodiment.

As is clear from the above explanation, according to the present invention, in a hanger retracting device for constructing an auxiliary girder for a long suspension bridge, a reaction girder detachably fixed below the auxiliary girder and a reaction girder provided above the auxiliary girder are provided. The retractable girder is connected to the retractable girder using a retractable jack, and a socket is fixed to the lower end of the hanger rope that hangs down through the insertion hole between the retractable girder and the replenishment girder. A fixing fitting that is positioned between the retractable girder and the socket and fitted onto the hanger rope, and at least a portion of which is detachable from the push-in sleeve;
When retracting the hanger rope, it is positioned between the supplementary girder and the socket and fitted into the push-in sleeve, and when the hanger is retracted, the push-in sleeve and socket, which are integrated with the retractable girder and descend by ℃, are pushed into the insertion hole of the supplementary girder. Then, by inserting and fixing the fixing metal fitting between the socket protruding from the insertion hole and the replenishment girder, the small stroke retraction jack and the hanger rope holder can be moved to a low position above the replenishment girder. Since the retracting jack can be installed at a lower position, the retracting jack can be made smaller and there is no need to provide a temporary hanger retracting device, which can significantly reduce equipment costs.There is also no need to work around the cable, and all work can be done at a low position. Therefore, the work of erecting the scaffolding and the work of moving the retracting device are significantly easier than in the past, and it is possible to improve work efficiency and reduce labor.

Further, since there is only a reaction force girder below the supplementary material girder, there is no risk of interference with the members of the bridge body, and the movement work is easy.

Furthermore, by providing a corner bend adjustment device that telescopically connects the retracting girder and the supplementary material girder side, it is possible to correct the bending of the axis of the retracting jack due to the inclination of the supplementary material girder when the hanger rope is retracted. As a result, the retraction jack operates smoothly and the retraction performance is significantly improved.

[Brief explanation of drawings]

Figure 1 is a schematic front view of a long suspension bridge under construction, Figure 2
Figures a and b are schematic configuration diagrams of conventional hanger retraction devices for erecting supplementary girders, and Figures 3 to 7 show embodiments of the hanger retracting device for erecting supplementary girders for long suspension bridges according to the present invention, Fig. 3 is a partially cutaway front view of the same, Fig. 4 is a composite view of the B observation surface view and CC sectional view of Fig. 3, Fig. 5 is a plan view and front view of the tip of the cable rope, Fig. 6 FIG. 6 is a plan view of the reinforcing washer, FIG. 6 C is a plan view of the fixing washer, and FIG. 7 is an explanatory view of the operation. 3... Cable, 4... Hanger loaf, 5... Auxiliary digit, 6... Socket, 2
1... Reaction force girder, 22... Retraction jack, 26... Retraction girder, 27... Rope groove, 28... Push sleeve , 29...
...Rope groove, 31... Fixture fitting, 32...
... Fixing washer, 33... Reinforced washer, 34...
...Corner bending adjustment device.

Claims (1)

[Scope of Claims] 1. In a hanger retracting device for erecting a supplementary girder, which pulls a hanger rope hanging down from a cable stretched over a supplemental girder to the supplemental girder side to draw a cable supplementary girder, the hanger rope a reaction force girder removably fixed to the lower side of the adjuvant surgery having an insertion hole of A retractable spar connected by a retractable jack, a socket fixed to the lower end of the hanger rope and protruding downward from the insertion hole of the supplement when the hanger rope is retracted by the retractable jack, and a socket located between the retractable spar and the socket. a push-in sleeve fitted onto the hanger rope;
A long suspension bridge, characterized in that a fixing metal fitting is provided between the supplementary agent and the socket when the rope is pulled in, the fixing metal fitting is fitted into the pushing sleeve and formed at least in part to be detachable. For erecting supplementary girders...Nga pulling device. 2. In a replenishment girder installation no-ga pulling device that pulls a hanger rope hanging down from a cable stretched over a replenishment girder to the replenishment girder side to pull the cable and replenishment girder, the hanger rope insertion hole a reaction force girder detachably fixed to the lower side of the adjuvant, and a retractable jack provided above the adjuvant and removably connected between the reaction force girder and the reaction force girder, which is provided with an insertion hole for the hanger rope. a retractable girder connected with a push-in sleeve fitted to the hanger rope; a fixing fitting positioned between the adjuvant and the socket when the hanger rope is pulled in and fitted into the push-in sleeve and formed at least partially removably; A hole is formed in the hole and connects the retracting girder and the supplementary material girder side.
A rope pulling device for constructing supplementary girders of a long suspension bridge, characterized by being equipped with a rope angle bending adjustment device.