A bridge deck rotation system and installation method

Abstract

The present invention provides a bridge deck rotation system and an installation method, which includes a first pulley block, a rotating hook and a winch. There are at least three winches, namely winch one, winch two and winch three. Winch one is connected to the first pulley block and is fixedly arranged on the bridge above the approach bridge deck. Winch one is connected to the first pulley block through a steel wire rope. The first pulley block is connected to a first sling at the lifting center of the bridge deck through a rotating hook. Winch two and winch three are used to tow the bridge deck for horizontal rotation. The present invention can realize the horizontal rotation of the bridge deck, as well as short-distance lateral and longitudinal movement. The first sling is connected to the first pulley block through a rotating hook, and in cooperation with winch two and winch three to tow the bridge deck to realize the horizontal rotation of the bridge deck; by retracting and releasing the steel wire ropes of winch two and winch three, the lengths of the second sling and the third sling can be adjusted to realize the short-distance lateral movement of the bridge deck; by retracting and releasing the steel wire rope of winch one, the lifting and lowering of the bridge deck can be realized.

Description

Technical Field

[0001] The invention belongs to the technical field of suspension bridge construction, and particularly relates to a bridge deck rotation system and an installation method thereof. Background Art

[0002] In mountainous areas, suspension bridges are restricted by transportation conditions and usually adopt steel truss beam structures. The steel truss beam structure is mainly divided into two parts: the bridge deck and the steel truss. The steel truss is assembled with members on the construction site, and small pieces of the steel bridge deck are transported to the construction site and welded into a whole.

[0003] Limited by the construction site in mountainous areas, the steel truss assembly site is usually arranged on the side of the middle span near the cable tower, and the steel bridge deck assembly site often needs to be arranged on the approach bridge of the side span, or the assembly site is far from the main bridge and transported to the approach bridge through transportation equipment.

[0004] The bridge deck is generally rectangular, first assembled in the assembly yard, and then transported to the hoisting position of the hoisting equipment by transportation equipment. For the convenience of transportation, the transportation state is usually at a 90° angle to the installation state. After being transported in place, the bridge deck needs to be rotated 90° again to the installation state, and then the hoisting equipment hoists the bridge deck to complete the hoisting. Summary of the Invention

[0005] The purpose of the invention is to provide a bridge deck rotation system, which can realize the horizontal 90° rotation of the bridge deck and short-distance lateral and longitudinal movement.

[0006] Another purpose of the invention is to provide a bridge deck installation method, which realizes the installation of the bridge deck through the transportation and rotation of the bridge deck.

[0007] For this reason, the technical solution provided by the invention is as follows:

[0008] A bridge deck rotation system includes a first pulley block, a rotating hook and a winch. There are at least three winches, namely winch one, winch two and winch three. Winch one is connected to the first pulley block. Winch one is fixed on the bridge above the approach bridge deck. Winch one is connected to the first pulley block through a steel wire rope. The first pulley block is connected to a first sling at the lifting center of the bridge deck through a rotating hook. Winch two and winch three are used to pull the bridge deck to rotate horizontally.

[0009] Winch two and winch three are fixed on the bridge and are respectively located on both sides of winch one. Winch two is connected to the hook of the first pulley block through a second sling. Winch three is connected to the hook of the first pulley block through a third sling.

[0010] The second hoist and the third hoist are both arranged on the approach bridge deck and are arranged side by side along the longitudinal direction of the bridge. The second hoist and the third hoist are respectively connected to a corner of the bridge deck through steel wire ropes, and the two connection points are on the diagonal line of the bridge deck. The length of the connection steel wire rope between the third hoist and the bridge deck is greater than that between the second hoist and the bridge deck. A turning wheel is arranged on the approach bridge deck, and the connection steel wire rope of the third hoist bypasses the turning wheel and is connected to the bridge deck;

[0011] The upper hook of the first pulley block is anchored to the bridge through the fourth sling, and the movable end of the first pulley block is connected to the steel wire rope of the first hoist.

[0012] It also includes a fourth hoist and a fifth hoist. The fourth hoist and the fifth hoist are both arranged on one side of the approach bridge deck and are arranged side by side along the longitudinal direction of the bridge. The fourth hoist and the fifth hoist are respectively connected to both ends of the midline in the length direction of the bridge deck through steel wire ropes.

[0013] The second sling is connected to the second hoist through the second pulley block, and the third sling is connected to the third hoist through the third pulley block. The second pulley block and the third pulley block are both anchored to the bridge.

[0014] A corbel is provided at the end of the approach bridge.

[0015] A method for installing a bridge deck uses a bridge deck rotation system in cooperation with a hoisting device. Through the bridge deck rotation system, the bridge deck directly below it is horizontally rotated 90° to the installation state, and then the hoisting device hoists the bridge deck to complete the hoisting, and finally the installation is carried out.

[0016] During rotation, the first hoist takes in the rope to lift the bridge deck, making the bridge deck in a suspended state. The second hoist takes in the rope, and the third hoist pays out the rope, causing the bridge deck to rotate clockwise. Conversely, the second hoist pays out the rope, and the third hoist takes in the rope, causing the bridge deck to rotate counterclockwise.

[0017] When the bridge deck is not directly below the bridge deck rotation system, it is pulled back by the traction hoist on the approach bridge. The first hoist takes in the rope to lift the bridge deck, relax the traction hoist to move the bridge deck 1 to directly below the rotation system, and make the straight line between the hoisting center of the bridge deck and the first hoist perpendicular to the ground.

[0018] The bridge deck is lifted by two approach bridge gantry cranes to below the rotation system or moved to directly below the rotation system through the track.

[0019] The beneficial effects of the present invention are:

[0020] The bridge deck rotation system provided by the present invention can achieve the horizontal rotation of the bridge deck, as well as short-distance lateral and longitudinal movement. The first sling is connected to the first pulley block through a rotating hook, and cooperates with the second and third winches to tow the bridge deck to achieve the horizontal rotation of the bridge deck; by retracting and releasing the steel wires of the second and third winches, the lengths of the second and third slings can be adjusted to achieve the short-distance lateral movement of the bridge deck; by retracting and releasing the steel wire of the first winch, the vertical movement (lifting and lowering) of the bridge deck can be achieved.

[0021] In the present invention, by arranging the fourth and fifth winches along the longitudinal direction of the bridge, tightening the first winch, lifting the bridge deck to a suspended state, and retracting and releasing the steel wires of the fourth and fifth traction winches to achieve the longitudinal movement of the bridge deck, the lowering of the first winch in cooperation with the retraction and release of the fourth and fifth traction winches realizes the longitudinal movement of the placement position of the bridge deck.

[0022] By setting corbels at the end of the approach bridge, it is ensured that the bridge deck can be transported directly below the rotation system, shortening the construction time.

[0023] To make the above content of the present invention more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the attached drawings, makes a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the first embodiment of the present invention;

[0025] Figure 2 is a front elevation schematic diagram of the bridge deck before rotation in the second embodiment of the present invention;

[0026] Figure 3 is a plan view schematic diagram of the bridge deck before rotation in the second embodiment of the present invention;

[0027] Figure 4 is a front elevation schematic diagram of the bridge deck after rotation in the second embodiment of the present invention;

[0028] Figure 5 is a plan view schematic diagram of the bridge deck after rotation in the second embodiment of the present invention;

[0029] Figure 6 is a front elevation schematic diagram of the third embodiment of the present invention;

[0030] Figure 7 is a plan view schematic diagram of the third embodiment of the present invention;

[0031] Figure 8 is a schematic diagram after the bridge deck is installed;

[0032] Figure 9 is a schematic diagram of lifting the bridge deck in the embodiment of the present invention;

[0033] Figure 10 It is a schematic diagram of the longitudinal movement of the bridge deck;

[0034] Figure 11 It is a schematic diagram of an embodiment of the present invention;

[0035] Figure 12 It is a schematic diagram of the corbel at the end face of the approach bridge.

[0036] In the figure:

[0037] Explanation of the reference numerals in the drawings:

[0038] 1. Bridge deck; 2. Approach bridge deck; 3. Hoisting belt one; 4. Pulley block one; 5. Pulley block two; 6. Pulley block three; 7. Winch one; 8. Winch two; 9. Winch three; 10. Tower column; 11. Cross beam; 12. Lifting center; 13. Winch four; 14. Winch five; 15. Steering wheel; 16. Gantry crane; 17. Corbel; 18. Rotary hook; 19. Hoisting belt two; 20. Hoisting belt three; 21. Hoisting belt four. Detailed implementation manners

[0039] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0040] It should be noted that in the present invention, the up, down, left, and right in the figure are regarded as the up, down, left, and right of the bridge deck rotation system described in this specification.

[0041] Now, refer to the accompanying drawings to introduce the exemplary implementation manners of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely, and to fully convey the scope of the present invention to those skilled in the art. The terms in the exemplary implementation manners shown in the accompanying drawings are not limitations to the present invention. In the drawings, the same unit / element uses the same reference numeral.

[0042] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the ordinary meaning understood by those skilled in the art. In addition, it can be understood that the terms defined in the commonly used dictionary should be understood as having a meaning consistent with the context of their related fields, and should not be understood as idealized or overly formal meanings.

[0043] Embodiment 1:

[0044] This embodiment provides a bridge deck rotation system, which includes a first pulley block 4, a rotating hook 18, and a hoist. There are at least three hoists, namely a first hoist 7, a second hoist 8, and a third hoist 9. The first hoist 7 is connected to the first pulley block 4. The first hoist 7 is fixedly arranged on the bridge above the approach bridge deck 2. The first hoist 7 is connected to the first pulley block 4 through a steel wire rope. The first pulley block 4 is connected to a first sling 3 at the hoisting center 12 of the bridge deck 1 through the rotating hook 18. The second hoist 8 and the third hoist 9 are used to horizontally rotate the bridge deck 1.

[0045] In the present invention, the first sling 3 is connected to the first pulley block 4 through the rotating hook 18. Cooperating with the second hoist 8 and the third hoist 9 to pull the bridge deck 1 can realize the horizontal rotation of the bridge deck 1. By taking in and paying out the steel wire rope of the first hoist 7, the vertical movement (lifting and lowering) of the bridge deck 1 can be realized.

[0046] Embodiment 2:

[0047] Based on Embodiment 1, this embodiment provides a bridge deck rotation system. The second hoist 8 and the third hoist 9 are fixedly arranged on the bridge and are respectively located on both sides of the first hoist 7. The second hoist 8 is connected to the hook of the first pulley block 4 through a second sling 19. The third hoist 9 is connected to the hook of the first pulley block 4 through a third sling 20.

[0048] Usage process:

[0049] The first sling 3 is connected to the first pulley block 4 through the rotating hook 18. Cooperating with the second hoist 8 and the third hoist 9 to pull the bridge deck 1 can realize the horizontal rotation of the bridge deck 1; when the first hoist 7 takes in the rope to lift the bridge deck 1 and the bridge deck 1 is in a suspended state, pull the second hoist 8 to take in the rope and the third hoist 9 to pay out the rope, so that the bridge deck 1 completes a clockwise rotation. During the rotation process, the third hoist 9 plays an insurance role to prevent the rotation speed from being too fast. Conversely, a counterclockwise rotation can be completed.

[0050] Embodiment 3:

[0051] Based on Embodiment 1, this embodiment provides a bridge deck rotation system. The second hoist 8 and the third hoist 9 are both arranged on the approach bridge deck 2 and are arranged side by side along the longitudinal direction of the bridge. The second hoist 8 and the third hoist 9 are respectively connected to a corner of the bridge deck 1 through steel wire ropes, and the two connection points are on the diagonal line of the bridge deck 1. The length of the connection steel wire rope between the third hoist 9 and the bridge deck 1 is greater than the length of the connection steel wire rope between the second hoist 8 and the bridge deck 1. A turning wheel 15 is provided on the approach bridge deck 2. The connection steel wire rope of the third hoist 9 bypasses the turning wheel 15 and is connected to the bridge deck 1;

[0052] The upper hook of the first pulley block 4 is anchored to the bridge by the fourth sling 21, and the movable end of the first pulley block 4 is connected to the steel wire rope of the first winch 7. As Figure 11 shown. Among them, Figure 11 There are a total of two tower columns 10, one on each side, left and right.

[0053] As Figure 2 、 Figure 3 shown, the second winch 8 takes in the rope, and the steel wire rope winds around the drum of the winch along the steering wheel 15, thereby driving one corner of the bridge deck 1 to move towards the second winch 8. At the same time, the third winch 9 pays out the rope, causing the other diagonal corner of the bridge deck 1 to move away from the third winch 9, so that the bridge deck 1 rotates clockwise. After the bridge deck 1 rotates, as Figure 4 and Figure 5 shown.

[0054] Embodiment 4:

[0055] Based on Embodiment 1, this embodiment provides a bridge deck rotation system, which further includes a fourth winch 13 and a fifth winch 14. The fourth winch 13 and the fifth winch 14 are both arranged on one side of the approach bridge deck 2 and are arranged side by side along the longitudinal direction of the bridge. The fourth winch 13 and the fifth winch 14 are respectively connected to both ends of the midline in the length direction of the bridge deck 1 through steel wire ropes.

[0056] When the bridge deck 1 is not directly below the rotation system, as Figure 6 and Figure 7 shown, the fourth winch 13 and the winch are arranged along the longitudinal direction of the bridge to realize a small longitudinal movement of the bridge deck 1, so that the hoisting center 12 of the bridge deck 1 is perpendicular to the ground along the straight line where the first winch 7 is located, and then the bridge deck 1 is rotated.

[0057] Usage process:

[0058] Tighten the first winch 7 to lift the bridge deck 1 into a suspended state. The longitudinal movement of the bridge deck 1 is realized by taking in and paying out the steel wire ropes of the fourth winch 13 and the fifth winch 14 for traction. The lowering of the first winch 7 cooperates with the taking in and paying out of the fourth winch 13 and the fifth winch 14 for traction to realize the longitudinal movement of the placement position of the bridge deck 1.

[0059] Embodiment 5:

[0060] Based on Embodiment 2, this embodiment provides a bridge deck rotation system. The second sling 19 is connected to the second winch 8 through the second pulley block 5, and the third sling 20 is connected to the third winch 9 through the third pulley block 6. The second pulley block 5 and the third pulley block 6 are both anchored to the bridge.

[0061] As Figure 1As shown in the figure, the lengths of sling two 19 and sling three 20 can be adjusted by winding and unwinding the steel wire ropes of hoist two 8 and hoist three 9, so as to realize the short-distance lateral movement of the bridge deck 1. Among them, Figure 1 There are a total of two tower columns 10, one on the left and one on the right.

[0062] Embodiment 6:

[0063] This embodiment provides a method for installing a bridge deck. By using the cooperation of the bridge deck rotation system and the hoisting equipment, the bridge deck 1 directly below it is horizontally rotated 90° to the installation state through the bridge deck rotation system, and then the hoisting equipment hoists the bridge deck 1 to complete the hoisting, and finally the installation is carried out.

[0064] The present invention realizes the installation of the bridge deck 1 through the transportation and rotation of the bridge deck 1. As Figure 8 shown in the figure.

[0065] Embodiment 7:

[0066] Based on Embodiment 6, this embodiment provides a method for installing a bridge deck. During rotation, hoist one 7 winds the rope to lift the bridge deck 1, so that the bridge deck 1 is in a suspended state. Hoist two 8 winds the rope and hoist three 9 unwinds the rope to make the bridge deck 1 rotate clockwise. On the contrary, hoist two 8 unwinds the rope and hoist three 9 winds the rope to make the bridge deck 1 rotate counterclockwise.

[0067] During clockwise rotation, hoist three 9 plays an insurance role during the rotation process to prevent the rotation speed from being too fast; during counterclockwise rotation, hoist two 8 plays an insurance role during the rotation process to prevent the rotation speed from being too fast.

[0068] Embodiment 8:

[0069] Based on Embodiment 6, this embodiment provides a method for installing a bridge deck. When the bridge deck 1 is not directly below the bridge deck rotation system, it is pulled back by the traction hoist on the approach bridge. Hoist one 7 winds the rope to lift the bridge deck 1, and the traction hoist is relaxed to move the bridge deck 1 to directly below the rotation system, so that the straight line between the hoisting center 12 of the bridge deck 1 and hoist one 7 is perpendicular to the ground.

[0070] Embodiment 9:

[0071] This embodiment takes the construction of a suspension bridge with a main span of 1386m as an example to illustrate the method of the present invention in detail.

[0072] In the construction of a suspension bridge with a main span of 1386m, the plane size of the bridge deck 1 is 25m×9.5m, and the weight of a single block is 55t. The bridge deck 1 is assembled on the approach bridge, and the included angle between the assembled state and the installed state is 90°.

[0073] The specific process is as follows:

[0074] Step 1: Use two approach bridge gantry cranes 16 to lift and hang the bridge deck 1 under the rotating device; as Figure 9 shown.

[0075] Step 2: Move the bridge deck 1 longitudinally: as Figure 10 shown, use the traction winch to pull back, the winch one 7 takes in the rope, lifts the bridge deck 1, and relaxes the traction winch to move the bridge deck 1 to directly below the rotating device;

[0076] Due to the limitation of the working movement range of the gantry crane 16, the bridge deck 1 cannot be transported directly below the rotating device, so the bridge deck 1 needs to be moved longitudinally in sequence.

[0077] Step 3: Rotate the bridge deck 1: as Figure 3 , Figure 5 shown, the winch two 8 takes in the rope, the steel wire rope winds around the drum of the winch along the steering wheel 15, thereby driving one corner of the bridge deck 1 to move towards the winch two 8, and at the same time the winch three 9 pays out the rope, making the other diagonal of the bridge deck 1 move away from the winch three 9, so as to make the bridge deck 1 rotate clockwise.

[0078] Step 4: After the rotation is completed, the winch one 7 pays out the rope and lowers the bridge deck 1 to directly below the rotating system.

[0079] Step 5: After the lifting equipment lifts the bridge deck 1 and completes the hoisting, install it.

[0080] Example 10:

[0081] In the construction of a suspension bridge with a main span of 1130m, the bridge deck 1 is assembled on the approach bridge, and the assembled bridge deck 1 is moved to directly below the rotating device by using a track. After the rotation is completed, the bridge deck 1 is hoisted by a cable crane. The center of the bridge deck 1 in the assembled state is on the center line of the bridge, and the center of the rotating device is also on the center line of the bridge. Therefore, there is no need to move the bridge deck 1 horizontally. A corbel 17 is set at the end of the approach bridge to ensure that the bridge deck 1 can be transported directly below the rotating device. Therefore, there is no need for the rotating system to move the bridge deck 1 longitudinally. As Figure 12 shown.

[0082] The specific process is as follows:

[0083] Step 1: Use the track arranged on the approach bridge or other equipment for transporting the bridge deck 1 to move the bridge deck 1 longitudinally to directly below the rotating system.

[0084] Step 2: Lift and rotate the bridge deck 1; in this example, the rotating system provided in Example 3 is used, and the rotation process is the same as that in Example 9.

[0085] Step 3: After the rotation is completed, lower the bridge deck 1 to directly below the rotating system.

[0086] Step 4: After the hoisting equipment hoists the bridge deck 1 and completes the hoisting, install it.

[0087] In summary, the bridge deck rotation system provided by the present invention can realize the horizontal rotation, short-distance transverse movement and longitudinal movement of the bridge deck 1. The first sling 3 is connected to the first pulley block 4 through the rotating hook 18, and cooperates with the second winch 8 and the third winch 9 to tow the bridge deck 1 to realize the horizontal rotation of the bridge deck 1; by retracting and releasing the steel wires of the second winch 8 and the third winch 9, the lengths of the second sling 19 and the third sling 20 can be adjusted to realize the short-distance transverse movement of the bridge deck 1; by retracting and releasing the steel wire of the first winch 7, the vertical movement (lifting and lowering) of the bridge deck 1 can be realized.

[0088] In the present invention, the fourth winch 13 and the fifth winch 14 are arranged longitudinally along the bridge. The first winch 7 is tightened to lift the bridge deck 1 to a suspended state. The longitudinal movement of the bridge deck 1 is realized by retracting and releasing the steel wires of the fourth winch 13 and the fifth winch 14. The lowering of the first winch 7 cooperates with the retracting and releasing of the fourth winch 13 and the fifth winch 14 to realize the longitudinal movement of the placement position of the bridge deck 1.

[0089] By arranging the corbel 17 at the end of the approach bridge, it is ensured that the bridge deck 1 can be transported directly below the rotation system, shortening the construction time.

[0090] Those of ordinary skill in the art can understand that the above embodiments are specific embodiments for implementing the present invention, and in actual applications, various changes can be made in form and details without departing from the spirit and scope of the present invention.

Claims

1. A method for installing a bridge deck, which uses a bridge deck rotation system in cooperation with a hoisting device, is characterized in that: The bridge deck (1) directly below it is horizontally rotated by 90° to the installation state through the bridge deck rotation system, then the hoisting equipment hoists the bridge deck (1) to complete the hoisting, and finally the installation is carried out; The bridge deck rotation system includes a first pulley block (4), a rotating hook (18) and a winch. There are at least three winches, namely a first winch (7), a second winch (8) and a third winch (9). The first winch (7) is connected to the first pulley block (4). The first winch (7) is fixedly arranged on a cross beam (11) above the approach bridge deck (2). The first winch (7) is connected to the first pulley block (4) through a steel wire rope. The first pulley block (4) is connected to a first sling (3) at the hoisting center (12) of the bridge deck (1) through the rotating hook (18). The second winch (8) and the third winch (9) are used to tow the bridge deck (1) for horizontal rotation and lateral movement; When used to tow the bridge deck (1) for lateral movement, the second winch (8) and the third winch (9) are fixedly arranged on the cross beam (11) and are respectively located on both sides of the first winch (7). The second winch (8) is connected to the hook of the first pulley block (4) through a second sling (19). The third winch (9) is connected to the hook of the first pulley block (4) through a third sling (20); When used to tow the bridge deck (1) for horizontal rotation, the second winch (8) and the third winch (9) are both arranged on the approach bridge deck (2) and are arranged side by side along the longitudinal direction of the bridge. The second winch (8) and the third winch (9) are respectively connected to a corner of the bridge deck (1) through steel wire ropes, and the two connection points are on the diagonal line of the bridge deck (1).

2. The method for installing a bridge deck according to claim 1, characterized in that: When used to tow the bridge deck (1) for horizontal rotation, the length of the connection steel wire rope between the third winch (9) and the bridge deck (1) is greater than that between the second winch (8) and the bridge deck (1). A turning wheel (15) is provided on the approach bridge deck (2). The connection steel wire rope of the third winch (9) bypasses the turning wheel (15) and is connected to the bridge deck (1); The upper hook of the first pulley block (4) is anchored on the cross beam (11) through a fourth sling (21). The movable end of the first pulley block (4) is connected to the steel wire rope of the first winch (7).

3. A method for installing a bridge deck according to any one of claims 1-2, characterized in that: It also includes a fourth winch (13) and a fifth winch (14). The fourth winch (13) and the fifth winch (14) are both arranged on one side of the approach bridge deck (2) and are arranged side by side along the longitudinal direction of the bridge. The fourth winch (13) and the fifth winch (14) are respectively connected to both ends of the midline in the length direction of the bridge deck (1) through steel wire ropes.

4. A method for installing a bridge deck according to claim 1, characterized in that: When used to tow the bridge deck (1) for lateral movement, the second sling (19) is connected to the second winch (8) through a second pulley block (5). The third sling (20) is connected to the third winch (9) through a third pulley block (6). The upper ends of the second pulley block (5) and the third pulley block (6) are both anchored on the cross beam (11).

5. A method for installing a bridge deck according to claim 2, characterized in that: A corbel (17) is provided at the end of the approach bridge.

6. The method for installing a bridge deck according to claim 1, wherein: When rotating, the first hoist (7) winds the rope to lift the bridge deck (1), making the bridge deck (1) in a suspended state. The second hoist (8) winds the rope, and the third hoist (9) pays out the rope, causing the bridge deck (1) to rotate clockwise. Conversely, the second hoist (8) pays out the rope, and the third hoist (9) winds the rope, causing the bridge deck (1) to rotate counterclockwise.

7. A method for installing a bridge deck according to claim 1, characterized in that: When the bridge deck (1) is not directly below the bridge deck rotation system, it is pulled back by the traction hoist on the approach bridge. The first hoist (7) winds the rope to lift the bridge deck (1), and the traction hoist is relaxed to move the bridge deck (1) to directly below the rotation system, making the straight line between the hoisting center (12) of the bridge deck (1) and the first hoist (7) perpendicular to the ground. The traction hoist includes a fourth hoist (13) and a fifth hoist (14). The fourth hoist (13) and the fifth hoist (14) are both arranged on one side of the approach bridge deck (2) and are arranged side by side along the longitudinal direction of the bridge. The fourth hoist (13) and the fifth hoist (14) are respectively connected to both ends of the midline in the length direction of the bridge deck (1) through steel ropes.

8. A method for installing a bridge deck according to claim 1, characterized in that: The bridge deck (1) is lifted to below the rotation system by two approach bridge gantry cranes (16) or moved to directly below the rotation system through the track.

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