Suspender cable force replacement device and method without temporary cable auxiliary

Abstract

The present application relates to a kind of temporary cable auxiliary suspension bridge sling cable force replacement device, replacement device is installed on the sling anchor head, the replacement device includes connecting member and rigid jacking member, connecting member includes steel truss (13), steel sleeve (3), bolt (13) and shaft ring (11);Steel sleeve (3) is fixedly connected on sling anchor head (4), the rigid truss structure (12) and bolt (13) are used to connect two slings, shaft ring (10) rotates around the axis of one of sling (7);The rigid jacking member is set as hydraulic jack (11), is installed on steel sleeve.This device is mainly installed in the anchor head part of sling, can transfer the cable force of sling to be replaced to existing sling, without installing temporary sling, construction efficiency is higher.

Description

TECHNICAL FIELD

[0001] The present application relates to a replacement device, in particular to a suspension bridge cable force replacement device without temporary cable auxiliary, and belongs to the technical field of bridge engineering. BACKGROUND

[0002] The cable is one of the main force members of the suspension bridge, and bears the main constant load and variable load of the suspension bridge during work. The cable is prone to fatigue and corrosion under the influence of environmental corrosion and the above loads, and may also be damaged by rust, broken wires or fire due to sudden accidents such as vehicle impact and fire, which seriously affects the safety of the suspension bridge. Therefore, the research on the replacement method of the suspension bridge cable is of great significance to the maintenance and development of cable bridges at home and abroad.

[0003] There are many cases of cable replacement of bridges at home and abroad. For example, the Forth Road Bridge in the United Kingdom replaced all the cables and made each cable have an independent single pin; the Lion Bridge in Canada replaced the cables and was the first suspension bridge to replace the entire cable without interrupting traffic; the Jiangyin Yangtze River Bridge and the Shantou Bay Bridge in China also replaced the damaged cables in time. Among them, the first short cable replacement of the Jiangyin Yangtze River Bridge adopted a single suspension point replacement scheme, and the second replacement adopted a five-suspension point replacement scheme. The above cable replacement methods mostly arrange temporary cables at the adjacent positions of the cables to be replaced, and continuously tension the temporary cables to remove the cables to be replaced when they are in a nearly stress-free state. In the implementation process of this method, if a single suspension point replacement scheme is adopted, the stress of the temporary cable will be very large, and the lug plate of the steel anchor box will yield or even tear. If a multi-suspension point replacement scheme is adopted, the replacement cable will face the disadvantages of multi-point operation and large on-site workload. These two schemes shorten the distance between the main cable and the steel box girder, so that the stress of the cable to be replaced is reduced to zero, which greatly affects the internal force and linear shape of the existing suspension bridge.

[0004] Although there are many examples of cable replacement projects at present, the research on the technology and theory of suspension bridge cable replacement is still less. The present application combines the basic structure of a large number of suspension bridge cables and proposes a suspension bridge cable force unloading device and replacement method without temporary cable auxiliary. Compared with the traditional cable replacement method which requires the setting of temporary cables and the removal of the cables in a stress-free state, the present application is based on the cable replacement method under the condition of limited stress of the cable and stress-free state of the end pin. SUMMARY

[0005] The present application is exactly aimed at the problems existing in the prior art, and provides a suspension bridge cable force replacement device without temporary cable auxiliary. The technical scheme provides a suspension bridge cable force unloading device and replacement method without temporary cable auxiliary, which can efficiently and conveniently replace the suspension bridge cable without the assistance of temporary cables.

[0006] In order to achieve the above object, the technical scheme of the present application is as follows: a temporary cable auxiliary-free suspension bridge cable force replacement device, which is installed on a cable anchor head, comprising a connecting member and a rigid jacking member, the connecting member comprising a steel truss, a steel sleeve, a bolt and a shaft ring; the steel sleeve is fixedly connected on the cable anchor head, the steel truss structure and the bolt are used to connect two cables, and the shaft ring rotates around the axis of one of the cables; the rigid jacking member is set as a hydraulic jack and is installed on the steel sleeve.

[0007] As an improvement of the present application, one end of the steel truss structure is fixed on the first cable, and the other end rotates around the axis of the second cable.

[0008] As an improvement of the present application, the rigid jacking member makes the pin shaft stress of the two ends of the second cable zero through its jacking force, and the first cable has stress.

[0009] As an improvement of the present application, the bottom of the steel sleeve is provided with a hydraulic jack bearing platform, and the outside of the steel sleeve is provided with a rotating shaft for rotating the cable replacement device.

[0010] As an improvement of the present application, one end of the steel truss structure is connected with the end of the first cable and the shaft ring, and the other end is connected with the end of the second cable through the bolt.

[0011] A cable replacement method for a suspension bridge, which adopts the replacement device, and comprises the following steps:

[0012] Step 1: using the cable replacement device to connect the ends of the first and second cables through the bolt;

[0013] Step 2: jacking the hydraulic jack arranged at the anchor head of the first cable until the pin shaft stress of the two ends of the second cable is zero, then removing the pin shaft at the end of the second cable, and then rotating the cable replacement device by 180° around the axis of the first cable;

[0014] Step 3: pulling the anchor heads at the two ends of the new cable to the original position of the second cable until the new cable reaches the installation position, and then fixing the new cable by using the pin shaft, unloading the hydraulic jack at the lower end of the first cable, and finally completing the replacement of the second cable;

[0015] Step 4: the replacement of the first cable is the same as the replacement of the second cable, and steps 1-3 are repeated to complete the replacement of the first cable.

[0016] Compared with the prior art, the present application has the following advantages, (1) the technical scheme realizes the dismounting of the sling under a certain stress state, and does not need temporary sling auxiliary sling replacement, reduces a large amount of site construction operation and replacement cost; (2) the replacement device and method have little influence on the relative displacement of the main cable and the stiffening beam of the suspension bridge, and accelerate the sling replacement speed; (3) the present application is a suspension bridge sling force unloading device and replacement method without temporary cable auxiliary, the device has the advantages of simple structure, large construction space, convenient sling replacement, and can solve the problem of insufficient control of the relative displacement of the main cable and the stiffening beam during sling replacement, and has the advantages of convenient installation, low cost, recyclable use and high efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structure schematic diagram of the sling replacement device in the embodiment of the present application.

[0018] Figure 2 It is an installation schematic diagram of the sling replacement device in the embodiment of the present application.

[0019] Figure 3 It is a step 2 schematic diagram in the embodiment of the present application.

[0020] Figure 4 It is a step 3 schematic diagram in the embodiment of the present application.

[0021] Figure 5 It is a schematic diagram after the second sling replacement is completed in the embodiment of the present application.

[0022] The figure legend: 1-main cable, 2-sling clamp, 3-steel sleeve, 4-anchor head, 5-sling replacement device, 6-pivot, 7-first sling, 8-vibration reduction frame, 9-web ear plate, 10-axle ring, 11-hydraulic jack, 12-steel truss, 13-bolt, 14-second sling, 15-new sling. DETAILED DESCRIPTION

[0023] In order to deepen the understanding of the present application, the embodiment will be described in detail below with reference to the drawings.

[0024] Embodiment 1: see Figure 1 A suspension bridge sling force replacement device without temporary cable auxiliary, as shown in Figures 1 to 4 The present application provides a suspension bridge sling force unloading device and replacement method without temporary cable auxiliary, which is used for replacing the first sling and the second sling of the suspension bridge.

[0025] As Figure 1The figure shows a suspension bridge cable tension replacement device without the aid of temporary cables. The replacement device is mounted on a cable anchor head and includes a connecting member and a rigid lifting member. The connecting member comprises a steel truss 12, a steel sleeve 3, a bolt 13, and a collar 10. The steel sleeve 3 is fixedly connected to the cable anchor head 4 and nested around a collar 10. The steel truss structure 12 and the bolt 13 connect the first and second cables, and the collar 10 rotates about the axis of one of the cables. The rigid lifting member is a hydraulic jack 11 mounted on the steel sleeve. One end of the steel truss structure 12 is fixed to the first cable 7, and the other end rotates about the axis of the second cable 14. The rigid lifting member, through its thrust, reduces the stress on the pins 6 at both ends of the second cable 14 to zero, while stress is present in the first cable 7. A hydraulic jack base is provided at the bottom of the steel sleeve, and a rotating shaft is provided on the outside of the steel sleeve for the cable replacement device to rotate. One end of the steel truss is connected to the end of the first sling and the collar 10, and the other end is fixed to the end of the second sling 14 by bolts. Both are connected by bolts 13; a sling replacement device 5 is installed at the upper and lower ends of the sling.

[0026] Example 2: See Figures 1-4 The present invention provides a method for replacing a suspension bridge sling, comprising the following steps:

[0027] Step 1: Complete the installation of the sling replacement device 5 at the end of the double sling 7, as shown in the following figure: Figure 2 As shown;

[0028] Step 2: Push the hydraulic jacks 11 at the anchor heads 4 at both ends of the first sling until the stress between the anchor cups and the pins 6 at both ends of the second sling to be replaced is zero. At this time, the pins 6 at the ends of the second sling can be removed, and then the sling replacement device 5 is rotated 180° around the axis of the first sling. Figure 3 As shown;

[0029] Step III: Pull the anchor heads 4 at both ends of the new sling to the original position of the second sling until the new sling corresponds to the installation position, and use the pin 6 to fix the new sling (such as Figure 4 As shown) and initially tensioned, the hydraulic jack 11 at the lower end of the first sling is unloaded, and finally the replacement of the second sling is completed, as shown Figure 5 As shown;

[0030] Step IV: Replacement of the first sling uses a new sling as a carrier. The replacement method is similar to the above, and finally the old sling is disassembled and the new sling is installed.

[0031] It should be noted that the above embodiments are not intended to limit the scope of protection of the present invention, and equivalent changes or substitutions made on the basis of the above technical solutions fall within the scope of protection of the claims of the present invention.

Claims

1. A suspension bridge cable force replacement device without temporary cable assistance, characterized in that: The replacement device is installed on the sling anchor head. The replacement device comprises a connecting member and a rigid lifting member, wherein the connecting member comprises a steel truss (12), a steel sleeve (3), a bolt (13) and a shaft collar (10); the steel sleeve (3) is fixedly connected to the sling anchor head (4); the steel truss (12) and the bolt (13) are used to connect two slings; the rigid lifting member is configured as a hydraulic jack (11) and is mounted on the steel sleeve; one end of the steel truss is connected to the end of the first sling and the shaft collar (10), and the other end is fixedly connected to the end of the second sling (14) by means of a bolt (13); and the shaft collar (10) rotates around the axis of the first sling (7).

2. The suspension bridge cable force replacement device without temporary cable assistance according to claim 1, characterized in that: One end of the steel truss (12) is fixed to the first sling (7), and the other end rotates around the axis of the second sling (14).

3. The suspension bridge cable force replacement device without temporary cable assistance according to claim 2, characterized in that: The rigid lifting member causes the stress of the pins (6) at both ends of the second sling (14) to be zero through its pushing force, while the first sling (7) has stress.

4. The suspension bridge cable force replacement device without temporary cable assistance according to claim 3, characterized in that: A hydraulic jack pedestal is provided at the bottom of the steel sleeve, and a rotating shaft is provided on the outside of the steel sleeve for the sling replacement device to rotate.

5. A method for replacing sling cables of a suspension bridge, characterized in that: Using the replacement device according to any one of claims 1 to 4, the method comprises the following steps: Step 1: Use a sling changing device to connect the ends of the first and second slings with bolts; Step 2: Push the hydraulic jack installed at the anchor head of the first sling until the stress of the pins at both ends of the second sling is zero. Remove the pins at the ends of the second sling, and then rotate the sling replacement device 180° around the axis of the first sling. Step 3: Pull the anchor heads at both ends of the new sling to the original position of the second sling until the new sling reaches the installation position, and use the pin shaft to fix the new sling. Then unload the hydraulic jack at the lower end of the first sling, and finally complete the replacement of the second sling. Step 4: The replacement process of the first sling is the same as that of the second sling. Repeat steps 1-3 to complete the replacement of the first sling.

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