JP2727673B2 - Rope spanning method for long suspension bridge - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for installing a rope for a long suspension bridge used for erection work of a suspension bridge having a long span.

[Related Art] Conventionally, a reciprocating system, a loop system (endless type), or the like has been adopted as a method of stretching a rope when constructing a long suspension bridge.

As shown in FIG. 5, the reciprocating system installs a winch a as a winding device and an unreeler b around which a erection rope f is wound at one point A where a suspension bridge is to be erected. A winch c as a driving device is installed at a point B, a carrier e is attached in the middle of a holing rope d previously passed between the winches a and c, and an erecting rope wound around the unreeler b on the carrier e. The carrier e is moved from the point A side to the point B side by synchronizing the winding drive of the winch c and the unwinding drive of the winch a with the end of the carrier f locked. By moving, the erection rope f is pulled out from the unreeler b and stretched from the point A side to the point B side. Thereafter, the winches a and c are driven in opposite directions to move the carrier e to the ground. Back in it unloaded from the B side to the point A side, and is to pass span the erection rope f of the required number between points AB By subsequently repeating the same tasks.

On the other hand, in the loop system, as shown in FIG. 6, a holing rope d is endlessly arranged between a time point A and a point B, and a winch g as a driving device is provided at the point B.
And a horizontal tensioning device h for applying tension to the entire holing rope d and a counterweight i for adjusting the extension of the holing rope d are provided at the point A, and the upstream portion and the downstream side of the holing rope d are provided. Attach the carrier e to each of the parts, and the unreeler b on the point A side
The work of alternately locking the erection ropes f with the upper and downstream carriers e and the reversible driving of the winch g are repeated to connect the required number of erection ropes f to the other points AB.
It is intended to span the gap.

[Problems to be Solved by the Invention] However, in the case of the reciprocating system, when returning the holing rope d from the point B to the point A, the empty carrier e is returned from the point B to the point A. However, after the carrier e arrives at the point A, it takes a long time to pull out the rope f from the point A to the point B. In order to eliminate the loss time, another similar system device is required. Problem. On the other hand, in the case of the above-mentioned loop system, since the number of turning sheaves for hanging the holing rope d is large and the sheave resistance of the holing rope d is large, the driving device becomes large and the holing rope d is greatly damaged. A uniform large diameter holing rope d is required, and because it is an endless type, a rope joint (long splice) is required.
Ancillary equipment such as a counterweight i and a horizontal tensioning device h is required.

Accordingly, an object of the present invention is to solve the problems of the reciprocating system and the loop system, and to provide a method of extending a rope for a long suspension bridge that can efficiently perform an operation of extending a rope for erection.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides two winding devices and two unreelers at one point where a suspension bridge should be built, and the other one where a suspension bridge should be built. At one point, one end of the holing rope having one end wound by the one winding device is wound on another winding device via the driving device, And first and second carriers for locking the erection rope wound around the unreeler are provided at positions on both ends of the holing rope via the driving device, respectively, and the one point side The pull-up rope locked to the first carrier was pulled out from the one unreeler by associating the respective winding devices and the driving device with each other to reach the other point, and then came to the one point. 2nd cap The other installation ropes locked to the rear are pulled out from another unreeler by driving each of the winding device and the driving device in the opposite direction to the above, and the installation rope is sequentially stretched from one point to the other point. The method is to stretch ropes for a long suspension bridge, which is characterized by passing.

[Operation] With the movement of the holing rope, the two carriers alternately pull out the erection rope, so that there is no loss in the return time of the carriers. Further, since the holing rope is not endless, the number of sheaves and sheave resistance are reduced, and the durability can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 3 show an embodiment of the present invention.
This section describes how to construct a long span suspension bridge that spans the valley 1. Two winches 4a and 4b are installed as winding devices on the base 2 on one side A where a suspension bridge should be built across the valley 1 and two unreelers 5a and 5b
On the other hand, a winch 6 having a rope pulling force by friction and having an endless type is provided on the foundation 3 on the other point B side on which the suspension bridge is to be built across the valley 1. Is installed, and the winch 4a on the point A side and the winch 6 on the point B side are connected to the point A.
Hang the holing rope 7 on the winch 4b on the side. The above-mentioned holing rope 7 includes a large-diameter rope 7c having a length corresponding to the span between the base portions 2 and 3, and small-diameter ropes 7a and 7b connected to both ends of the large-diameter rope 7c. The ropes 7a and 7b are wound around the drums of the winches 4a and 4b, respectively, and the large-diameter rope 7c in the middle portion is wound around the winch 6, and the ropes are placed on the tower 8 on the point A and the tower 9 on the point B. Each of the guide sheaves 10 is temporarily guided. Further, the holing rope 7 has a large diameter rope.
At the connection between the small rope 7a and the small rope 7a, a first carrier 12a for locking and pulling out the erection rope 11 wound around the unreeler 5a is provided. The connecting portion is provided with a second carrier 12b for locking and pulling out the erection rope 11 wound around the unreeler 5b, and by driving the winches 4a and 4b in the opposite direction in synchronization with the driving of the winch 6. , So that the first and second carriers 12a and 12b can be moved in alternate directions between the points AB. Reference numeral 13 denotes guide rollers provided on the tower top saddles 14 and 15 for guiding the erection rope 11, respectively.

When the erection rope 11 is stretched from the base part 2 on the point A side to the base part 3 on the point B side, first, the rope is wound around the first carrier 12a brought to the base part 2 side and around the unreeler 5a. The end of the installation rope 11 is locked. In this state, the winch 6 is driven in the required direction, and the winch 4a is sparely used as a winch and the winch 4b is used as a take-up winch in synchronism therewith.
That is, simultaneously with driving the winch 6, the winch 4a is driven in the unwinding direction and the winch 4b is driven in the winding direction. As a result, the same amount of the small-diameter rope 7c as the large-diameter rope 7c pulled by the endless winch 6 is fed out to the winch 4a, and the same amount of the large-diameter rope 7c drawn out from the winch 6 is used. The diameter rope 7b is taken up by the winch 4b, and the holing rope 7 is entirely a winch 4a.
From the vehicle to the winch 4b via the winch 6. At this time, the first carrier 12 provided at the connection between the large-diameter rope 7c and the small-diameter rope 7a of the holing rope 7 is provided.
a is the basic part 2 with the movement of the above-mentioned holing rope 7.
Moving from the side to the base 3 side, the erection rope 11 locked to the first carrier 12a
Then, it is sequentially drawn out from a, and is extended from the base portion 2 side to the base portion 3 side via the guide roller 13 of the tower top saddle 14 and the guide roller 13 of the tower top saddle 15. The erection rope 11 stretched between the base portions 2 and 3 in this manner is fixed and installed using a spray saddle (not shown) of the base portions 2 and 3.

Next, the winch 6 and the winches 4a and 4b are driven in the opposite directions to return the first carrier 12a to the base portion 2 side. Since the second carrier 12b provided at the connecting portion between the rope 7c and the small-diameter rope 7b is already located on the side of the base portion 2, the erection rope 11 wound around the unreeler 5b around the second carrier 12b. The first carrier 12a is returned to the base portion 2 with the end of the first carrier locked. In this case, contrary to the above, winch 4a
Is used as a take-up winch and the winch 4b is used as a winch.
While the carrier 12a is returned from the base portion 3 side to the base portion 2, the erection rope 11 is pulled out from the unreeler 5b by the second carrier 12b and stretched between the base portions 2 and 3. Thereafter, in a similar manner, the construction rope 11 of the unreeler 5a and the construction rope 11 of the unreeler 5b are alternately pulled out, so that the construction rope 11 can be efficiently stretched between the base portions 2 and 3.

In the present invention, since a semi-loop system is employed as an intermediate system between the conventional reciprocating system and the loop system, there is no loss in the return time of the carriers 12a and 12b as in the reciprocating system, and more than when two reciprocating systems are used. The number of installed machines is small, and additional equipment such as a counterweight and a horizontal tensioning device such as a loop system is not required. Furthermore, in the case of the loop system, the holing rope required a thick rope uniformly throughout the entire line, but in the case of the present invention, the part to be wound around the endless winch 6 uses the large-diameter rope 7c for safety. The pull-out side should have enough strength and the winding side should have enough strength to wind up the rope's own weight.
Use a, 7b. Also, compared to the loop system, especially, the number of turning sheaves at the time point A side is small, so that the overall sheave resistance is small and the degree of rope damage is reduced, and since there is no rope joint (long splice), holing is performed. There is an advantage that the durability of the rope 7 increases.

Further, in the case of the present invention, the present invention can be applied to other rope erection work. That is, when implementing the method of the present invention, it is necessary to install various devices as shown in FIGS. 1 to 3, but for example, as shown in FIG. 4, only one system is installed on the winch 4a side. At this point, the same operation as the conventional reciprocating system can be performed.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the scope of the present invention.

[Effects of the Invention] As described above, according to the rope stretching method for a long suspension bridge of the present invention, the following excellent effects are exhibited.

(I) The first and second carriers provided on both sides of the driving device are alternately used, so that the erection rope can be sequentially stretched from one point to another point. As described above, there is no loss in the return time of the carrier, and the work can be performed efficiently.

(Ii) Since work can be performed with two winding devices and one driving device, the number of machines to be installed can be reduced as compared with a case where two sets of reciprocating systems are used.

(Iii) The use of the semi-loop system eliminates the need for ancillary equipment such as a counterweight and a horizontal tensioning device such as a loop system (endless type).

(Iv) Since it is a semi-loop system, the number of turning sheaves and the overall sheave resistance are smaller than those of a loop system, and the need for a rope joint (long splice) eliminates the need for a rope joint, increasing the durability of the holing rope. Does not need to be a large diameter rope as a whole.

(V) Even before the installation of the various devices is completed, if the system of the winding device on one side is used, it can be adopted as a reciprocating system.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a method for stretching a rope for a long suspension bridge according to the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a plan view of FIG. 2, and FIG. FIG. 5 is a schematic diagram showing an application example of the present invention, FIG. 5 is a schematic diagram of a reciprocating system, and FIG. 6 is a schematic diagram of a loop system. A: One point to build a suspension bridge, B: Other point to build a suspension bridge, 4a, 4b ... Winch (winding device), 5
a, 5b …… Unlealer, 6… Winch (drive),
7… Holing rope, 11… Rope for construction, 12a…
... 1st carrier, 12b ... 2nd carrier.

Claims (1)

(57) [Claims] (1) Two winding devices and two unreelers are installed at one point where a suspension bridge is to be built, and one drive device is installed at the other point where a suspension bridge is to be built. The other end of the holing rope wound by the take-up device is wound on another winding device via the drive device, and the positions of both ends of the holing rope passed through the drive device A first and a second carrier for locking the erection rope wound around the unreeler, respectively, and the erection rope locked to the first carrier at the one point side is connected to each of the winding ropes. By pulling out the one unreeler by interlocking the take-off device and the drive device and arriving at the other point, then another erection rope locked to the second carrier that came to the one point,
The above-mentioned winding device and the driving device are driven in the opposite direction to the above to be pulled out from another unreeler, and the erection rope is sequentially stretched from one point to the other point, and a rope for a long-sized suspension bridge, Overlay method.