Suspension bridge central cable clamp hoisting method

Abstract

This invention discloses a method for hoisting the central cable clamp of a suspension bridge. Taking the segmented cable clamp as an example, the upper half of the central cable clamp is generally lighter and can be transported using a cable crane, while the lower half is heavier and is transported by truck or cargo ship to the ground or river surface at the mid-span. A hoisting system is then set up on the main cable to lift the cable clamp. This method mainly solves the following problems: (1) reducing safety risks during the hoisting process of the central cable clamp; (2) reducing the amount of cable crane load-bearing rope required due to the large weight of a small number of central cable clamps; (3) simplifying the hoisting process, saving construction time, and facilitating its promotion. The specific advantages of this patent are as follows: 1. Setting up an independent hoisting system to hoist the central cable clamp greatly reduces safety risks during the hoisting process; 2. Avoiding excessive use of cable crane load-bearing rope, which increases construction costs; 3. Simplifying the hoisting process, saving construction time, and facilitating its promotion.

Description

Technical Field

[0001] This invention relates to the field of hoisting central cable clamps for suspension bridges, specifically a method for hoisting central cable clamps for suspension bridges. Background Technology

[0002] Cable clamps in suspension bridges are components connecting the main cable and suspenders. Depending on their installation location and purpose, they can be divided into central clamps and general clamps. Each clamp consists of two halves, which can be vertically or horizontally separated, connected by high-strength bolts. By applying pre-tension to the high-strength bolts, the two halves of the clamp clamp tightly grip the main cable, and are firmly fixed to the main cable by the friction between the clamp and the main cable. A general clamp typically weighs no more than 4 tons and is transported to the design location as a whole by a cable-stayed crane for installation. Central clamps can weigh over 10 tons, and half a clamp may weigh over 8 tons. Transporting the entire clamp or the two halves separately by a cable-stayed crane requires increasing the diameter or number of load-bearing ropes, significantly increasing construction costs. Furthermore, excessively heavy loads on the cable-stayed crane can cause it to tilt during transport, posing a high safety risk. Finally, the construction process is time-consuming. Summary of the Invention

[0003] Therefore, in order to solve the above-mentioned shortcomings, the present invention provides a method for hoisting the central cable clamp of a suspension bridge; it mainly solves the following problems: (1) reducing the safety risks in the construction process of hoisting the central cable clamp; (2) reducing the amount of cable crane load-bearing rope used due to the large weight of a small number of central cable clamps; (3) the hoisting process is simple to operate, saves construction time, and is easy to promote.

[0004] This invention is implemented as follows: a method for hoisting the central cable clamp of a suspension bridge is constructed, characterized in that: taking the cable clamps divided into upper and lower sections as an example, the upper half of the central cable clamp is generally lighter and can be transported by cable crane, while the lower half is heavier and is transported by truck or cargo ship to the ground or river surface at the mid-span position. A hoisting system is set up on the main cable to hoist the cable clamp; the lower half cable clamp hoisting system consists of a tower top winch, wire rope, hydraulic jacks, pulleys, hand-operated hoists, precision-rolled threaded steel bars, and hydraulic jacks.

[0005] The central sling clamp hoisting operation process is as follows:

[0006] Step 1: Use a cable crane to transport and install the upper half of the cable clamp, and transport the lower half of the cable clamp to the ground or river surface in the middle of the span by truck or cargo ship. Insert the lifting ropes into the bolt holes at both ends of the lower half of the cable clamp for hoisting.

[0007] Step 2: Open the catwalk netting, and wrap a steel wire rope around the main cable strands at both ends of the upper cable clamp (the steel wire rope is inserted into a rubber tube to avoid damaging the main cable and the cable clamp coating) and hang a pulley as a fixed pulley; draw a steel wire rope from the 10t winch at the top of the tower on both sides, pass the rope end through the fixed pulley and descend to the ground to form a hoisting system;

[0008] Step 3: Connect the lifting wire rope to the jack rope of the lower central clamp, start the winches on both banks to wind up the rope, and lift the lower clamp upwards until it is 2m away from the main cable.

[0009] Step 4: Adjust the position of the lower half of the cable clamp. Use 4 precision-rolled threaded steel bars to insert into the tie rod holes of the upper and lower half of the cable clamp. Use 4 jacks to lift simultaneously until the upper and lower cable clamps are accurately in place.

[0010] Step 5: Insert the bolts of the cable clamps into the holes of the upper and lower cable clamps, remove the hoisting system, jacks and precision-rolled threaded steel bars, and after all the bolts are inserted, tension the bolts according to the design preload.

[0011] The present invention has the following advantages: The present invention provides a method for hoisting the central cable clamp of a suspension bridge; it mainly solves the following problems: (1) reducing the safety risks during the hoisting construction of the central cable clamp; (2) reducing the amount of cable crane load-bearing rope required due to the large weight of a small number of central cable clamps; (3) the hoisting process is simple to operate, saves construction time, and is easy to promote. The specific advantages of this patent are as follows: 1. Setting up an independent system for hoisting the central cable clamp greatly reduces the safety risks during the hoisting process of the central cable clamp; 2. Avoiding excessive use of cable crane load-bearing rope, which leads to increased construction costs; 3. The hoisting process is simple to operate, saves construction time, and is easy to promote. Attached Figure Description

[0012] Figure 1 This is the longitudinal layout diagram of the upper cable clamp hoisting;

[0013] Figure 2 This is the longitudinal layout diagram for the lower half of the cable clamp lifting;

[0014] Figure 3 This is a diagram showing the lateral arrangement of the cable clamp lifting mechanism;

[0015] Figure 4 This is a diagram showing the layout of the tower top of the hoisting system;

[0016] Figure 5 This is a diagram showing the arrangement of the jack lifting cable clamps. Detailed Implementation

[0017] The following will be combined with the appendix Figures 1-5This invention will be described in detail, and the technical solutions in the embodiments of this invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0018] This invention provides an improved method for hoisting the central cable clamp of a suspension bridge. As shown in the figure, taking a segmented cable clamp as an example, the upper half of the central cable clamp is generally lighter and can be transported using a cable crane. The lower half is heavier and is transported by truck or cargo ship to the ground or river surface at the mid-span. A hoisting system is then installed on the main cable to lift the cable clamp. The lower half cable clamp hoisting system consists of a tower top winch, wire rope, hydraulic jacks, pulleys, hand-operated hoists, precision-rolled threaded steel bars, and hydraulic jacks.

[0019] The central sling clamp hoisting operation process is as follows:

[0020] Step 1: Use a cable crane to transport and install the upper cable clamp (see...) Figure 1 The lower half of the cable clamp is transported by car or cargo ship to the ground or river surface in the middle of the span, and the lifting rope is inserted into the screw holes at both ends of the lower half of the cable clamp for hoisting.

[0021] Step 2: Open holes in the catwalk mesh. Wrap one steel wire rope (entering the wire rope through a rubber tube to avoid damaging the main cable and the clamp coating) around the main cable strands at both ends of the upper cable clamp and attach a pulley as a fixed pulley. Lead one steel wire rope from each of the 10t winches at the top of the towers on both sides, pass the rope end through the fixed pulley, and lower it to the ground to form the hoisting system. (See...) Figure 2 , Figure 4 )

[0022] Step 3: Connect the lifting wire rope to the jack rope of the lower central clamp, start the winches on both banks to wind up the rope, and lift the lower clamp upwards (see...). Figure 2 , Figure 3 (), until it stops 2m away from the main cable.

[0023] Step 4: Adjust the position of the lower half of the cable clamp. Use four precision-rolled threaded steel bars, insert them into the tie rod holes of both the upper and lower half of the cable clamp, and use four jacks to lift them simultaneously (see...). Figure 5 Continue until the upper and lower clamps are accurately in place.

[0024] Step 5: Insert the bolts of the cable clamps into the holes of the upper and lower cable clamps, remove the hoisting system, jacks and precision-rolled threaded steel bars, and after all the bolts are inserted, tension the bolts according to the design preload.

[0025] The advantages of this patent are as follows: 1. Setting up an independent hoisting system for the central clamp greatly reduces the safety risks during the hoisting process; 2. Avoiding excessive use of cable crane load-bearing ropes, which would increase construction costs; 3. The hoisting process is simple to operate, saves construction time, and is easy to promote.

[0026] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for hoisting the central cable clamp of a suspension bridge, characterized in that: The central cable clamp is divided into upper and lower sections. The upper section of the central cable clamp is generally lighter and is transported by cable crane, while the lower section is heavier and is transported by truck or cargo ship to the ground or river surface at the mid-span position. A hoisting system is set up on the main cable to lift the cable clamp. The hoisting system for the lower section consists of a tower top winch, wire rope, jacks, pulleys, hand-operated hoists, precision-rolled threaded steel bars, and jacks. The central sling clamp hoisting operation process is as follows: Step 1: Use a cable crane to transport and install the upper half of the cable clamp, and transport the lower half of the cable clamp to the ground or river surface in the middle of the span by truck or cargo ship. Insert the lifting ropes into the bolt holes at both ends of the lower half of the cable clamp for hoisting. Step 2: Open holes in the catwalk mesh, wrap one steel wire rope around the main cable strands at both ends of the upper cable clamp and hang one pulley as a fixed pulley. The steel wire rope is inserted into the rubber tube to avoid damaging the main cable and the cable clamp coating; draw one steel wire rope from the 10t winch at the top of the tower on both sides, pass the rope end through the fixed pulley and descend to the ground to form a hoisting system; Step 3: Connect the lifting wire rope to the jack rope of the lower central clamp, start the winches on both banks to wind up the rope, and lift the lower clamp upwards until it is 2m away from the main cable. Step 4: Adjust the position of the lower half of the cable clamp. Use 4 precision-rolled threaded steel bars to insert into the tie rod holes of the upper and lower half of the cable clamp. Use 4 jacks to lift simultaneously until the upper and lower cable clamps are accurately in place. Step 5: Insert the bolts of the cable clamps into the holes of the upper and lower cable clamps, remove the hoisting system, jacks and precision-rolled threaded steel bars, and after all the bolts are inserted, tension the bolts according to the design preload.

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