CN119021109A

CN119021109A - A main cable strand traction system

Info

Publication number: CN119021109A
Application number: CN202411391146.3A
Authority: CN
Inventors: 李孟; 沈锐利; 闫勇; 殷振威; 提衍征; 靳壮壮; 黄小午; 沈国繁; 徐苹栋
Original assignee: Shandong High Speed Construction Management Group Co ltd; Southwest Jiaotong University
Current assignee: Shandong High Speed Construction Management Group Co ltd; Southwest Jiaotong University
Priority date: 2024-10-08
Filing date: 2024-10-08
Publication date: 2024-11-26

Abstract

The present invention discloses a main cable strand traction system, comprising: a first tower support and a second tower support, the upper parts of the first tower support and the second tower support are both connected to the first crossbeam of the tower top gantry; a first track cable and a second track cable that are parallel to each other, the two ends of the first track cable and the second track cable are anchored; the middle part of the first track cable is connected to the lower part of the first tower support, and the middle part of the second track cable is connected to the lower part of the second tower support; a traction trolley, comprising a vehicle body; one end of the vehicle body is connected to the traction cable, and the other end is connected to the main cable strand; it also includes a first roller pair connected to the top of the vehicle body, and the two rollers of the roller pair are used for walking the first track cable and the second track cable respectively; a winch is used to pull the traction cable. The beneficial effect of the present invention is that the traction trolley is combined with the tower support to make the main cable strand safe and efficient when traction is passed through the tower. The present invention also has the advantages of simple structure, convenient installation, and low cost.

Description

Main cable strand traction system

Technical Field

The invention relates to the technical field of suspension bridge construction, in particular to a main cable strand traction system.

Background

At present, a main cable of a suspension bridge is generally erected by adopting a construction process of a prefabricated parallel cable strand method (PPWS), and a traction system commonly used by the PPWS can be divided into: portal puller type traction system, track trolley traction system and aerial cableway traction system. Portal puller type traction system: the system utilizes a dragger to drag a cable strand anchor head to move forward on a catwalk, a plurality of portal frames are required to be arranged for ensuring the operation of the cable strand, and the portal frames and corresponding portal frame guide wheel sets are arranged on the tower top and a cable scattering saddle; cableway traction system: the traction system directly pulls the front anchor head of the cable strand by the traction cable, and lifts the front anchor head by using a chain block hung on an empty track cable on a catwalk, and the front anchor head is pulled by a winch to move forward on a catwalk roller; track trolley traction system: the traction system lays a track on a catwalk, and a front anchor head of a rope strand is pulled by a trolley running on the track to move forward on the catwalk.

The portal puller type traction system has a complex structure and high manufacturing cost, and the portal puller type traction system needs to pass through in a decelerating way when passing through the portal, so that the traction efficiency is reduced; the overhead cableway traction system is convenient to install, but the overhead cableway traction system can span the overhead cableway traction system only by exchanging anchor heads when passing through the overhead cableway and the loose cable saddle, so that the construction speed is low; the track trolley traction system has high track cost, high requirements on the rigidity of the catwalk, correspondingly increases the cost of the catwalk, and greatly influences the traction speed by the deformation of the catwalk.

Disclosure of Invention

The invention aims to provide a main cable strand traction system, which aims to solve the problem of reduced traction efficiency caused by a portal frame and a tower passing mode in the process of erecting a main cable of a suspension bridge.

The technical scheme for realizing the purpose of the invention is as follows:

A main strand pulling system, comprising: the upper parts of the first tower passing bracket and the second tower passing bracket are connected to a first beam of the tower top portal; a first track cable and a second track cable parallel to each other, both ends of the first track cable and the second track cable being anchored; the middle part of the first track cable is connected to the lower part of the first tower passing bracket, and the middle part of the second track cable is connected to the lower part of the second tower passing bracket; a traction cart comprising a cart body; one end of the vehicle body is connected with a traction rope, the other end is connected with a main cable strand; the first roller pair is connected to the upper part of the vehicle body, and two rollers of the roller pair are respectively used for walking the first track cable and the second track cable; and the winch is used for pulling the traction rope.

Further, the vehicle further comprises a V-shaped connecting piece, the lower part of the V-shaped connecting piece is hinged above the vehicle body, and the upper part of the V-shaped connecting piece is also provided with a first horizontal connecting piece and a second horizontal connecting piece respectively; the first roller pair and the second roller pair are connected to the first horizontal connecting piece according to the travelling direction of the traction trolley, and the third roller pair and the fourth roller pair are connected to the second horizontal connecting piece according to the travelling direction of the traction trolley.

Preferably, the roller pair adopts a balanced two-force rod structure, namely, two rollers of the roller pair are connected by a balance rod.

Preferably, the rollers of the roller pair are further provided with baffles on the outer sides thereof.

Further, the tower crane further comprises a third tower passing bracket, a fourth tower passing bracket, a fifth tower passing bracket and a sixth tower passing bracket; the upper parts of the third tower passing bracket and the fourth tower passing bracket are connected to the second cross beam of the tower top portal, and the upper parts of the fifth tower passing bracket and the sixth tower passing bracket are connected to the third cross beam of the tower top portal; the second cross beam and the third cross beam are positioned at two sides of the first cross beam, and the height of the second cross beam and the third cross beam is lower than that of the first cross beam; the two sides of the middle part of the first track cable are respectively connected to the lower parts of the third tower passing bracket and the fifth tower passing bracket, and the two sides of the middle part of the second track cable are respectively connected to the lower parts of the fourth tower passing bracket and the sixth tower passing bracket.

Still further, the tower carriage includes a cable transfer saddle to which the track cable is attached.

Preferably, the rope rotating saddle is further provided with a backing plate, so that the rollers of the traction trolley are carried by the wheel surface and converted into wheel rim for carrying when passing through the rope rotating saddle.

Further, the cable drum is further provided with a power cable drum for winding the main cable strand to be paid out.

Preferably, a braking mechanism for limiting the release of the main cable strand is also arranged in the power cable tray.

Further, the main cable riding wheel is arranged on the main cable strand traction channel to support the main cable strand.

The invention has the beneficial effects that the main cable strand is safe and efficient when being pulled through the tower by adopting a mode of combining the traction trolley with the tower-passing bracket. The invention also has the advantages of simple structure, convenient installation, low cost and the like.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a schematic diagram of the structure of the traction cart of the embodiment.

Fig. 3 is a schematic view of the structure of the tower support according to the embodiment.

Fig. 4 is a schematic view of a cable saddle structure of an embodiment.

Fig. 5 is a schematic view of an embodiment of a traction cart roller over-rotation cable saddle.

Fig. 6 is a traction structure layout of an embodiment.

Marked in the figure as: track cable 1, main cable (prefabricated parallel cable strand) 2, catwalk cable 3, tower bracket 4, roller 5, traction trolley 6, horizontal connector 7, baffle 8, tower top door frame 9, beam 10, track cable layering 11, backing plate 12, cable saddle 13, traction cable 14, traction cable diverting pulley 15, power cable tray 16, friction hoist 17.

Detailed Description

The invention provides a main cable strand traction system, which comprises:

the track cable is anchored at two ends and supported at the tower top, so as to provide guidance and support for the traction of the main cable strand. The track cable is arranged right above the main cable strand traction channel, and two track cables are arranged on a single line to ensure the stable operation of the traction trolley. The two track ropes are arranged in parallel, and the reasonable interval is arranged to adapt to the walking of the traction trolley. The relative height of the track cable from the catwalk needs to consider the maximum deflection of the track cable under the vertical load in the main cable traction process, and the track cable is suitable for being 2m from the catwalk under the maximum deflection.

The traction trolley is pulled by the traction rope, walks on the track rope through the idler wheels, the anchor head of the main cable strand is connected with the traction trolley, and the main cable strand follows the traction trolley to finish traction. The traction trolley is provided with at least 1 pair of rollers, the rollers are of a two-force balance structure, the traction trolley is suitable for track cable linear change, the stress of each roller is more uniform, and the traction trolley is prevented from tilting due to uneven stress. Baffle plates can be arranged on the outer sides of the rollers of the traction trolley to prevent the rollers from jumping, so that structural safety is improved.

The tower passing support provides overhead support for the track cable and allows the tractor trolley to continuously pass over the top of the tower. The tower passing bracket is arranged on the tower top portal frame, and a plurality of supporting points can be arranged to enable the track cable to smoothly bypass the tower top. And each supporting point can be provided with a rope turning saddle for supporting the track rope to turn. The size of the rope turning saddle is matched with the size of the idler wheel of the traction trolley, and a proper gap is reserved between the rope turning saddle and the traction trolley, so that the traction trolley can pass smoothly. Preferably, a gasket is arranged on the rope rotating saddle, and the wheel surface of the trolley is used for carrying and converting the trolley into the wheel rim for carrying when passing through the rope rotating saddle, so that the trolley passes through the tower smoothly and quickly.

The traction structure comprises a traction rope, a winch and a control system thereof, and provides power for traction of the main rope strand. Preferably, the traction ropes are circularly arranged and driven by a friction type winch. The friction type winch can realize cyclic reciprocating operation and avoid abnormal situations of overlarge traction force in the traction process.

The power cable tray can be further arranged and fixed through brackets arranged at two sides of the bridge, and the cable strand wound inside the power cable tray is rotated and discharged. Preferably, a braking mechanism is provided in the power cord reel for clamping the cord to limit payout of the cord.

The main cable supporting wheel can also be provided, is of a pulley structure and is arranged on the main cable strand traction channel to support the main cable.

Examples:

A main strand pulling system, as shown in fig. 1, comprising:

The track cable 1 is arranged right above a traction channel of the main cable 2, is anchored at two ends and supported at the top of the tower, and provides guidance and support for traction of the main cable. The track cable 1 has two single lines to ensure the stable operation of the traction trolley 6. The two track ropes are arranged in parallel, and a reasonable interval is arranged to adapt to the running of the traction trolley 6.

As shown in fig. 2, the traction trolley 6 walks on the track cable through the roller 5, the anchor head of the main cable 2 is connected with the body of the traction trolley 6, and the main cable 2 follows the traction trolley 6 to finish traction. The traction trolley 6 is provided with four pairs of rollers 5, each pair of rollers is of a two-force balance structure and is connected by a balance rod so as to adapt to track cable linear change, so that the stress of each roller is more uniform, and the traction trolley 6 is prevented from tilting due to uneven stress. Baffle 8 is arranged on the outer side of the roller 5 of the traction trolley 6 to prevent the roller from jumping, and structural safety is improved.

As shown in fig. 3 and 4, the tower-passing bracket 4 is connected to the cross beam 10, provides overhead support for the track cable 1, and allows the traction trolley 6 to continuously pass through the tower top; the tower passing bracket 4 is arranged on the tower top portal 9, a plurality of supporting points are arranged on a single frame (namely, the tower passing bracket 4 is respectively arranged on a plurality of cross beams) so that the track cable 1 smoothly bypasses the tower top, and a cable turning saddle 13 is arranged at each supporting point to support the track cable 1 to turn.

As shown in fig. 5, the rope rotating saddle 13 is further provided with a backing plate 12, so that the roller 5 of the traction trolley 6 is carried by the wheel surface and converted into a wheel rim for carrying when passing through the rope rotating saddle 13, and the traction trolley 6 passes through the tower smoothly and quickly.

As shown in fig. 6, the traction structure comprises a traction rope 14, a friction type winch 17 and a control system thereof, wherein the traction rope 14 is circularly arranged and driven by the friction type winch 17 to provide power for traction of the main cable strand.

The power cable tray 16 is fixed by brackets arranged at two sides of the bridge, rotates and releases the cable strand wound in the power cable tray, and is internally provided with a braking mechanism for clamping the cable so as to limit the cable from being released.

The specific steps for realizing traction erection of the main cable by using the embodiment are as follows:

1. the power cord reel 16 (containing the main cord strand) is mounted to a designated location bracket with an crane.

2. The traction rope 14 is carried to the tower top along one catwalk from the friction type winch 17, then passes through the tower top to the anchoring area at the other side, bypasses the two traction rope steering pulleys 15, and then returns to the friction type winch 17 from the other catwalk, and is connected with the friction type winch 17, so that the length of the traction rope 14 is adjusted, and the traction structure operates normally.

3. The track rope 1 is fixed on the traction rope 14 by using rope clamps, the track rope 1 is pulled in place by using a traction structure, the tower crane lifts the track rope 1 into the rope turning saddle 13, two ends of the track rope 1 are anchored, the track rope 1 is adjusted to a specified elevation during anchoring, and the two track ropes 1 are kept at the same elevation.

4. The traction trolley 6 is mounted on the track rope 1, the traction rope 14 is fixed on the traction trolley 6 by using a rope clamp, and the length of the traction rope is adjusted so that the steel wire rope is in a semi-suspended state.

5. When the traction trolley 6 moves to the side of the power cable disc 16, the anchor head of the main cable (prefabricated parallel cable strand) 2 is connected to the traction trolley 6, the friction winch 17 starts traction, and the traction trolley 6 and the anchor head of the main cable (prefabricated parallel cable strand) 2 are driven to act by driving the traction cable 14, so that the traction work of the main cable is completed.

6. When the anchor head of the main cable (prefabricated parallel strand) 2 advances to the overhead position, the traction speed of the friction hoist 17 is slowed down.

7. And continuing to use the friction type winch 17 to pull until reaching an anchoring end after passing through the tower top.

8. After one main cable 2 is pulled, the other main cable 2 is pulled, and the traction trolley 6 returns to the power cable tray 16 area.

Claims

1. A main cable strand traction system, characterized by comprising:

A first tower support and a second tower support, wherein upper portions of the first tower support and the second tower support are both connected to a first crossbeam of a tower top gantry;

The first track cable and the second track cable are parallel to each other, and both ends of the first track cable and the second track cable are anchored; the middle of the first track cable is connected to the lower part of the first tower support, and the middle of the second track cable is connected to the lower part of the second tower support;

The traction trolley comprises a vehicle body; one end of the vehicle body is connected to the traction rope, and the other end is connected to the main cable strand; and further comprises a first roller pair connected to the top of the vehicle body, wherein two rollers of the roller pair are used for running the first track rope and the second track rope respectively;

A winch is used to pull the traction rope.

2. The main cable strand traction system as described in claim 1 is characterized in that it also includes a V-shaped connecting member, the lower part of the V-shaped connecting member is hinged to the top of the vehicle body, and the upper part of the V-shaped connecting member is also provided with a first horizontal connecting member and a second horizontal connecting member respectively; it also includes a second roller pair, a third roller pair and a fourth roller pair, the first roller pair and the second roller pair are connected to the first horizontal connecting member according to the traveling direction of the traction trolley, and the third roller pair and the fourth roller pair are connected to the second horizontal connecting member according to the traveling direction of the traction trolley.

3. The main cable strand traction system as described in claim 2 is characterized in that the roller pair adopts a balanced two-force rod structure, that is, the two rollers of the roller pair are connected by a balance rod.

4. The main cable strand traction system as described in claim 2 is characterized in that the rollers of the roller pair are also provided with baffles on the outside.

5. The main cable strand traction system as described in claim 1 is characterized in that it also includes a third over-tower bracket, a fourth over-tower bracket, a fifth over-tower bracket and a sixth over-tower bracket; the upper parts of the third over-tower bracket and the fourth over-tower bracket are both connected to the second cross beam of the tower top gantry, and the upper parts of the fifth over-tower bracket and the sixth over-tower bracket are both connected to the third cross beam of the tower top gantry; the second cross beam and the third cross beam are located on both sides of the first cross beam, and their heights are lower than the first cross beam; the two sides of the middle part of the first track cable are also respectively connected to the lower parts of the third over-tower bracket and the fifth over-tower bracket, and the two sides of the middle part of the second track cable are also respectively connected to the lower parts of the fourth over-tower bracket and the sixth over-tower bracket.

6. The main cable strand traction system according to claim 1 or 5, characterized in that the tower support comprises a saddle, and the track cable is connected to the saddle.

7. The main cable strand traction system according to claim 6 is characterized in that the saddle is also provided with a pad so that the roller of the traction trolley is converted from wheel surface load to wheel rim load when passing through the saddle.

8. The main cable strand traction system according to claim 1, further comprising a power cable drum for winding the main cable strand to be released.

9. The main cable strand traction system according to claim 8, characterized in that a braking mechanism for limiting the release of the main cable strands is also provided in the power cable drum.

10. The main cable strand traction system according to claim 1, further comprising a main cable supporting wheel, which is arranged on the main cable strand traction channel to support the main cable strand.