A construction method for a pedestrian landscape bridge passing under an existing viaduct pier doorway

Abstract

The present application discloses a construction method of a pedestrian landscape bridge passing under the existing viaduct pier gate, wherein a connecting piece is embedded in advance when the viaduct box girder is prefabricated; an upper hanging seat is installed below the viaduct box girder, and the upper hanging seat is fixed to the connecting piece; a hanger is installed on the hanger based on part of the upper hanging seat, and a track is installed on the hanger, and the track passes through the pier gate, and both sides of the pier are left empty to connect the upper hanging seat of the bridge deck of the pedestrian landscape bridge passing through the pier gate, and multiple hoist cranes are installed on the track; the bridge deck is installed with a lower hanging seat; the bridge deck is transported between two piers, the hoist crane is connected to the bridge deck, the bridge deck is lifted to a set height, and then the hoist crane is moved along the track so that one end of the bridge deck passes through the pier gate, and then the bridge deck is lowered to the installation position by the hoist crane, and the corresponding lower hanging seat and upper hanging seat are connected by the hanging rod; the hoist crane, the track and the hanger are removed. The present application has the effect of facilitating the construction of a pedestrian landscape bridge based on the existing viaduct pier gate.

Description

Technical Field

[0001] The invention relates to the technical field of landscape bridge construction, in particular to a construction method of a pedestrian landscape bridge passing under an existing viaduct pier doorway. Background Art

[0002] Building a pedestrian landscape bridge under the existing viaduct relying on the bridge piers can improve space utilization and reduce the construction cost of the pedestrian landscape bridge. However, the distance between the lower part of the pier portal and the bottom of the viaduct box girder is small, and the bridge deck of the pedestrian landscape bridge cannot be assisted by large-scale lifting equipment, which makes construction inconvenient. In particular, when installing the bridge deck of the pedestrian landscape bridge passing through the pier portal, one end of the bridge deck needs to pass from one side of the pier to the other side of the pier, that is, the bridge deck needs to be raised and lowered, and also needs to be translated, which makes construction difficult.

[0003] Regarding the above-mentioned related technologies, the applicant believes that the following defects exist: it is inconvenient to construct a pedestrian landscape bridge relying on the existing viaduct pier archways. Summary of the invention

[0004] In order to facilitate the construction of a pedestrian landscape bridge relying on the existing viaduct pier doorway, the present application provides a method for constructing a pedestrian landscape bridge passing under the existing viaduct pier doorway.

[0005] In the first aspect, the present application provides a method for constructing a pedestrian landscape bridge under an existing viaduct pier gate, which adopts the following technical solution:

[0006] A method for constructing a pedestrian landscape bridge passing under an existing viaduct pier doorway comprises the following steps:

[0007] When the viaduct box girder is prefabricated, the connecting parts are embedded in the designed positions on both sides of the lower part;

[0008] After the viaduct construction and installation is completed, the upper hanging seat is installed below the viaduct box girder, and the upper hanging seat is fixed to the connecting piece;

[0009] A hanger is installed on the upper suspension seat, and a track is installed on the hanger. The track runs through the bridge pier doorway, and both sides of the bridge pier are left empty to connect the upper suspension seat of the bridge deck of the pedestrian landscape bridge passing through the bridge pier doorway; then multiple hoist cranes are installed on the track, and the hoist cranes can move along the track;

[0010] When the bridge deck of the pedestrian landscape bridge is prefabricated, a lower hanging seat is installed at the designed position; the prefabricated bridge deck is transferred between the two bridge piers and placed under the track, and then the hoist is connected to the bridge deck, and the bridge deck is lifted to the set height by the hoist, and then the hoist is moved along the track so that one end of the bridge deck passes through the bridge pier door hole until the bridge deck reaches the top of the installation position;

[0011] Lower the bridge deck to the installation position by hoist, and then connect the corresponding lower and upper suspension seats by suspension rods;

[0012] Remove the hoist, tracks and hanger.

[0013] By adopting the above technical scheme, due to the distance between the box girder of the viaduct and the bottom of the pier gate, it is impossible to use large-scale lifting equipment to install the bridge deck of the pedestrian landscape bridge of the present application; if a lifting platform vehicle or other equipment that can be moved and lifted on the ground is used to lift the bridge deck of the pedestrian landscape bridge, it will be affected by the flatness of the ground, which may easily cause the lifting platform vehicle or other equipment that can be moved and lifted on the ground to overturn or sink into the soil. It is necessary to first level and compact the ground under the viaduct, and even to lay a layer of concrete pavement to solve the problems of overturning or sinking into the soil when using the lifting platform vehicle to lift the bridge deck, which is costly and inconvenient to construct; and the track of the present application is installed on the upper hanging seat, and the installation of the track is unnecessary. The box girders of the ground and the viaduct need to be modified or destroyed, and the constructed viaduct can be used as the load-bearing structure for the lifting of the bridge deck of the pedestrian landscape bridge to improve the stability of the bridge deck lifting. Through the cooperation of the track and the hoist, the bridge deck of the pedestrian landscape bridge can be installed in a smaller space without being affected by the distance between the box girder of the viaduct and the bottom of the pier gate, so the construction is convenient and efficient. When installing the track of the present application, the upper hanging seat of the bridge deck connected to the pier gate is avoided. After the bridge deck passes through the pier gate and is lowered to the installation position, the hanger can be installed quickly, and the position of the bridge deck can be adjusted by the hoist during the installation of the hanger, which is convenient for the positioning and installation of the hanger. After the hanger is installed, the hanger and the hanger are removed.

[0014] Preferably, after the construction and installation of the viaduct is completed, the height of the bottom of the pier gate is measured, and a pad is cast at the bottom of the pier gate. The height of the pad is determined by the measured height of the bottom of the pier gate and the height of the designed pedestrian landscape bridge. When the bridge deck is lowered to the installation position, the bridge deck is supported on the pad.

[0015] By adopting the above technical solution, due to construction errors and settlement factors, after the completion of the viaduct, the height of the piers has a certain error, which will affect the installation of the pedestrian landscape bridge. By setting the pads, the influence of the height error of the piers on the pedestrian landscape bridge is reduced, which facilitates the installation of the pedestrian landscape bridge.

[0016] Preferably, the hoist crane is pulled along the track by a winch, and multiple hoists are connected to each other by pull ropes. The traction rope of the winch is connected to the hoist crane in front of the moving direction. The winch is set on the ground, and the traction rope of the winch is turned by a guide wheel, and the guide wheel is installed at one end of the track; after the bridge deck is lowered to the installation position, the connection between the traction rope and the hoist crane is released.

[0017] By adopting the above technical solution, for bridge decks with heavier weight, the friction between the hoist and the track may be greater, making it inconvenient to move. With the assistance of a winch, the hoist can be easily pulled from one side of the pier to the other side of the pier, and the winch can be set on the ground for easy disassembly and assembly.

[0018] Preferably, after the bridge deck reaches above the installation position, first lower the bridge deck to 10-20 cm above the installation position, and then observe whether the horizontal position of the bridge deck meets the requirements. If the horizontal position of the bridge deck does not meet the requirements, manually use a push rod to push the hoist to fine-tune the position of the bridge deck until the horizontal position of the bridge deck meets the requirements, and then continue to lower the bridge deck to the installation position.

[0019] By adopting the above technical solution, the bridge deck is fine-tuned by manually pushing the hoist through the push rod, making it easier to place the bridge deck in the accurate installation position, which is convenient for the subsequent installation of the hanger and the bridge deck.

[0020] Preferably, the pedestrian landscape bridge between two adjacent bridge piers belongs to at least three different bridge boards, two of which pass through two bridge pier doorways respectively. During installation, the two bridge boards passing through the bridge pier doorways are installed first, and then the bridge board between the two bridge boards passing through the bridge pier doorways is installed.

[0021] By adopting the above technical solution, when installing two bridge decks passing through the bridge pier doorway, the upper hanging seat corresponding to the middle bridge deck can be used to install the hanger, leaving the upper hanging seat corresponding to the hoisted bridge deck vacant to facilitate the subsequent installation of the hanger rod.

[0022] Preferably, the bridge deck between the two bridge decks passing through the bridge pier opening is installed with the assistance of two gantry cranes, the two gantry cranes are respectively arranged at the two ends of the bridge deck, and the gantry cranes are arranged across the bottom of the viaduct.

[0023] By adopting the above technical solution, since the bridge deck between two bridge decks passing through the bridge pier doorway does not need to be moved horizontally during installation, but only needs to be lifted and lowered, the installation can be achieved through a gantry crane, which is convenient and quick.

[0024] In the second aspect, the present application provides a method for constructing a pedestrian landscape bridge under an existing viaduct pier gate, which adopts the following technical solution:

[0025] A method for constructing a pedestrian landscape bridge passing under an existing viaduct pier doorway comprises the following steps:

[0026] When the viaduct box girder is prefabricated, the connecting parts are embedded in the designed positions on both sides of the lower part;

[0027] After the viaduct construction and installation is completed, the upper hanging seat is installed below the viaduct box girder, and the upper hanging seat is fixed to the connecting piece;

[0028] The hanger is installed on the upper hanging seat, and a track is installed on the hanger. The track runs through the pier doorway, and then multiple hoist cranes are installed on the track, and the hoist cranes can move along the track;

[0029] When the bridge deck of the pedestrian landscape bridge is prefabricated, a lower hanging seat is installed at the designed position; the prefabricated bridge deck is transferred between the two bridge piers and placed under the track, and then the hoist is connected to the bridge deck, and the bridge deck is lifted to the set height by the hoist, and then the hoist is moved along the track so that one end of the bridge deck passes through the bridge pier door hole until the bridge deck reaches the top of the installation position;

[0030] Temporary support devices are installed at both ends of the bridge deck installation position, and then the bridge deck is lowered to the installation position by a hoist. The two ends of the bridge deck are supported on two temporary support devices respectively, and then the hoist, guide rails and hangers are removed;

[0031] Use the hanging rod to connect the corresponding lower hanging seat and upper hanging seat, and then remove the temporary support device.

[0032] By adopting the above-mentioned technical scheme, in the case where there is no extra upper hanging seat for installing the bridge deck, only the upper hanging seat corresponding to the bridge deck to be hoisted can be used to install the hanger. Since the hanger occupies the upper hanging seat, the hanger cannot be installed after the bridge deck is lowered to the installation position. Therefore, in this application, after the bridge deck is lowered to the installation position, a temporary supporting device is used to support the bridge deck, and then the hoist, guide rails and hanger are removed to vacate the corresponding upper hanging seat for installing the hanger. After the installation of the hanger is completed, the hanger pulls the bridge deck and keeps the bridge deck stable. At this time, the temporary supporting device is removed to complete the hoisting of the bridge deck.

[0033] Preferably, the temporary support device includes a lifting platform vehicle, which is arranged on the ground below the bridge deck. The upper end of the lifting platform vehicle abuts against the bottom of the bridge deck and supports the bridge deck. After the boom is installed, the lifting platform vehicle is lowered and driven away from under the bridge deck.

[0034] By adopting the above technical solution, the lifting platform vehicle is easy to operate, has a large supporting force, is small in size, is easy to move, and can adjust the height of the bridge plate during the installation of the boom, which facilitates the installation of the boom.

[0035] To sum up, the present application includes at least the following beneficial technical effects: the track of the present application is installed by relying on part of the upper hanging seat, and the installation of the track does not require modification or destruction of the ground and the box girder of the viaduct. The constructed viaduct is used as the hoisting load-bearing structure for the bridge deck of the pedestrian landscape bridge, thereby improving the stability of the bridge deck hoisting. Through the cooperation of the track and the hoist, the bridge deck of the pedestrian landscape bridge can be installed in place in a smaller space, and is not affected by the distance between the box girder of the viaduct and the bottom of the pier gate, so the construction is convenient and the construction efficiency is high. When installing the track of the present application, the upper hanging seat of the bridge deck connected to the pier gate is avoided. After the bridge deck passes through the pier gate and is lowered to the installation position, the hanger can be installed quickly, and the position of the bridge deck can be adjusted by the hoist during the installation of the hanger, which is convenient for the positioning and installation of the hanger. After the hanger is installed, the hanger and the hanger are removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a construction schematic diagram of a method for constructing a pedestrian landscape bridge that passes under an existing viaduct pier archway in Example 1 of the present application.

[0037] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0038] Figure 3 yes Figure 1 Enlarged view of point B in the middle.

[0039] Figure 4 It is a schematic diagram of the suspension rod after installation of the first embodiment of the present application.

[0040] Figure 5 It is a construction schematic diagram of the lowering of the bridge deck of the pedestrian landscape bridge of Example 2 of the present application to the installation position.

[0041] Description of reference numerals:

[0042] 1. Viaduct box girder; 2. Bridge pier doorway; 3. Upper hanging seat; 4. Bridge deck; 5. Track; 6. Hoist; 7. Winch; 8. Traction rope; 9. Guide wheel; 10. Hanger; 11. Lower hanging seat; 12. Hanging rod; 13. Temporary support device. DETAILED DESCRIPTION

[0043] The following is combined with Figure 1-5 This application is described in further detail.

[0044] The embodiment of the present application discloses a method for constructing a pedestrian landscape bridge that passes under a pier arch of an existing viaduct.

[0045] Embodiment 1

[0046] Reference Figure 1 A construction method for a pedestrian landscape bridge passing under an existing viaduct pier doorway comprises the following steps:

[0047] S1. According to the design drawings, when the viaduct box girder 1 is prefabricated, connectors are respectively embedded at the designed positions on both sides of the lower part, and the connectors are anchor bolts; the connectors are avoided to be implanted after the box girder is prefabricated to keep the structure of the box girder complete and avoid reducing the bearing capacity of the box girder.

[0048] S2. After the viaduct is constructed and installed, the height of the bottom of the pier door opening 2 is measured, and a pad is cast at the bottom of the pier door opening 2. The height of the pad is determined by the measured height of the bottom of the pier door opening 2 and the height of the designed pedestrian landscape bridge. Figure 2 , then install the upper hanging seat 3 below the viaduct box girder 1, and fix the upper hanging seat 3 to the connecting piece through nuts. The upper hanging seat 3 includes a mounting plate and two upper hanging plates, which are distributed in an eight-shaped shape. The upper end of the upper hanging plate is fixedly connected to the mounting plate, and a through hole is provided on the mounting plate. During installation, the connecting piece passes through the through hole, and then nuts are installed on the connecting piece to fix the mounting plate. A hanging hole is provided at the lower end of the upper hanging plate.

[0049] S3. Reference Figure 2 and Figure 3 , the hanger 10 is installed on the upper hanging seat 3 by relying on part of the upper hanging seat 3. The hanger 10 is installed on the lower end of the upper hanging plate by bolts and nuts. The bolts pass through the upper hanging holes. The hanger 10 can be removed from the upper hanging seat 3 by removing the bolts and nuts. The hanger 10 is installed with a track 5, which is horizontally arranged and made of channel steel. The track 5 passes through the upper part of the pier doorway 2. Both sides of the pier are left empty to connect the upper hanging plate of the upper hanging seat 3 of the bridge deck 4 of the pedestrian landscape bridge passing through the pier doorway 2. Then, multiple hoists 6 are installed on the track 5. The hoist 6 can move along the track 5. The hoist 6 is an electric hoist 6.

[0050] S4. When the bridge deck 4 of the pedestrian landscape bridge is prefabricated, a lower hanging seat 11 is installed at the designed position. At least four lower hanging seats 11 are installed on each bridge deck 4. Two lower hanging seats 11 are respectively arranged at both ends of each bridge deck 4, and the two lower hanging seats 11 are respectively arranged on both sides of the bridge deck 4. The design position of the lower hanging seat 11 corresponds to the design position of the upper hanging seat 3 one by one, and the number corresponds one by one. The lower hanging seat 11 includes a lower hanging plate, the lower end of the lower hanging plate is welded to the bridge deck 4, and the upper end of the lower hanging plate is provided with a lower hanging hole. The prefabricated bridge deck 4 is transported to the ground between the two bridge piers and placed under the track 5. Then the two ends of the bridge deck 4 are tied with steel wire ropes, and the steel wire ropes are arranged between the lower hanging seats 11 at both ends of the bridge deck 4. Then connect the hoist 6 to the bridge deck 4, and lift the bridge deck 4 20 cm from the ground through the hoist 6 to observe whether the bridge deck 4 is tilted. If it is tilted, lower the bridge deck 4 to the ground, adjust the lifting point position of the wire rope, and lift it again until the lifted bridge deck 4 is stable and not tilted, and then lift the bridge deck 4 to a set height, which is higher than the cushion block. The set height in this embodiment is 50 cm from the upper surface of the cushion block. Then move the hoist 6 along the track 5 so that one end of the bridge deck 4 passes through the bridge pier door opening 2 until the bridge deck 4 reaches the top of the installation position.

[0051] S5. Reference Figure 4 , lower the bridge plate 4 to 10-20cm above the installation position through the hoist 6, and then observe whether the horizontal position of the bridge plate 4 meets the requirements. If the horizontal position of the bridge plate 4 does not meet the requirements, manually use the push rod to push the hoist 6 to fine-tune the horizontal position of the bridge plate 4 until the horizontal position of the bridge plate 4 meets the requirements, and then continue to lower the bridge plate 4 to the installation position. At this time, the middle part of the bridge plate 4 is supported on the pad, and then the corresponding lower hanging plate and upper hanging plate are connected through the hanging rod 12. The two ends of the hanging rod 12 are respectively connected to the lower hanging plate and the upper hanging plate through the rotating shaft. The rotating shaft passes through the lower hanging hole and the upper hanging hole, and the axial movement of the rotating shaft is limited.

[0052] S6. Remove the bolts and nuts connecting the hanger 10 and the upper hanging plate, disassemble the hanger 10, the hoist 6 and the track 5 as a whole, and then use them as a whole to hang the next bridge plate 4 passing through the bridge pier doorway 2.

[0053] It should be noted that the pedestrian landscape bridge between two adjacent bridge piers is composed of at least three different bridge plates 4, of which two bridge plates 4 pass through two bridge pier openings 2 respectively. During installation, the two bridge plates 4 passing through the bridge pier openings 2 are installed first, and then the bridge plate 4 between the two bridge plates 4 passing through the bridge pier openings 2 is installed. The bridge plate 4 between the two bridge plates 4 passing through the bridge pier openings 2 is installed with the assistance of two gantry cranes, which are respectively arranged at the two ends of the bridge plate 4, and the gantry cranes are arranged across the bottom of the viaduct. When installing the two bridge plates 4 passing through the bridge pier openings 2, the upper hanging seat 3 corresponding to the middle bridge plate 4 is used to install the hanger 10, and the upper hanging seat 3 corresponding to the hoisted bridge plate 4 is left empty, so as to facilitate the subsequent installation of the hanger 12.

[0054] For the convenience of operation, the hoist 6 is pulled along the track 5 by the winch 7, and the multiple hoists 6 are connected to each other by a pull rope. The traction rope 8 of the winch 7 is connected to the hoist 6 in the front of the moving direction. The winch 7 is set on the ground. The traction rope 8 of the winch 7 is turned by the guide wheel 9, and the guide wheel 9 is installed at the front end of the track 5. After the bridge deck 4 is lowered to the installation position, the connection between the traction rope 8 and the hoist 6 is released. With the assistance of the winch 7, the hoist 6 can be easily pulled from one side of the pier to the other side of the pier, and the winch 7 can be set on the ground for easy disassembly and assembly.

[0055] The implementation principle of the construction method of a pedestrian landscape bridge under the bridge pier gate of an existing viaduct in the embodiment of the present application is as follows: due to the influence of the distance between the box girder of the viaduct and the bottom of the bridge pier gate 2, it is impossible to use large-scale lifting equipment to install the bridge deck 4 of the pedestrian landscape bridge of the present application. If the bridge deck 4 of the pedestrian landscape bridge is lifted by a lifting platform vehicle or other equipment that can be moved and lifted on the ground, it will be affected by the flatness of the ground. During the movement of the lifting platform vehicle or other equipment on the ground, it is easy for the lifting platform vehicle or other equipment to overturn or sink into the soil; therefore, before lifting the bridge deck 4 of the pedestrian landscape bridge by using a lifting platform vehicle or other equipment that can be moved and lifted on the ground, it is necessary to first level and compact the ground under the viaduct, and even to lay a layer of concrete pavement to solve the problems of overturning or sinking into the soil when the bridge deck 4 is lifted by the lifting platform vehicle, which is costly, inconvenient to construct, and damages the grass and trees under the viaduct. The construction method of this embodiment does not have the above problems. The track 5 of this embodiment is installed by relying on part of the upper suspension seat 3. The installation of the track 5 does not require the modification or destruction of the ground and the box girder of the viaduct. The constructed viaduct is used as the hoisting load-bearing structure of the bridge deck 4 of the pedestrian landscape bridge, which improves the stability of the bridge deck 4 hoisting. Through the cooperation of the track 5 and the hoist 6, the bridge deck 4 of the pedestrian landscape bridge can be installed in a smaller space, which is not affected by the distance between the box girder of the viaduct and the bottom of the pier doorway 2. The movement of the bridge deck 4 does not rely on the ground and is not affected by the flatness of the ground. The construction is convenient and the construction efficiency is high. The track 5 of this application avoids the upper suspension seat 3 of the bridge deck 4 to be hoisted during installation. After the bridge deck 4 passes through the pier doorway 2 and is lowered to the installation position, the suspension rod 12 can be quickly installed, and the position of the bridge deck 4 can be adjusted by the hoist 6 during the installation of the suspension rod 12, which is convenient for the positioning and installation of the suspension rod 12. After the suspension rod 12 is installed, the sling and the hanger 10 are removed.

[0056] Embodiment 2

[0057] Reference Figure 5, which is different from the technical solution of the first embodiment in that: when installing the hanger 10 in the construction method of a pedestrian landscape bridge that passes under the existing viaduct pier gate, the installation of the hanger 10 occupies the upper hanging plate of the upper hanging seat 3 of the corresponding bridge deck 4 to be hoisted, and the steel wire rope passes through the lower hanging hole when connecting the bridge deck 4. After the bridge deck 4 reaches the top of the installation position, temporary support devices 13 are respectively installed at both ends of the installation position of the bridge deck 4. The temporary support device 13 includes a lifting platform vehicle, and then the bridge deck 4 is lowered to the installation position by the hoist 6. The two ends of the bridge deck 4 are respectively supported on the upper end of the lifting platform vehicle, and then the hoist 6, the guide rail and the hanger 10 are removed, and then the corresponding lower hanging seat 11 and the upper hanging seat 3 are connected by the hanging rod 12, and finally the lifting platform vehicle is driven to descend and drive away from the bottom of the pedestrian landscape bridge.

[0058] This embodiment is applicable to the situation where there is no extra upper hanging seat 3 for installing the bridge deck 4, and only the upper hanging seat 3 corresponding to the bridge deck 4 to be hoisted can be used to install the hanger 10. Because in this use environment, the hanger 10 occupies the upper hanging seat 3, and after the bridge deck 4 is lowered to the installation position, the suspension rod 12 cannot be installed. The hanger 10 needs to be disassembled and the upper hanging seat 3 needs to be vacated before the suspension rod 12 can be installed. Therefore, in this embodiment, after the bridge deck 4 is lowered to the installation position, a temporary support device 13 is used to support the bridge deck 4, and then the hoist 6, the guide rail and the hanger 10 are removed, and the corresponding upper hanging seat 3 is vacated for installing the suspension rod 12. After the suspension rod 12 is installed, the suspension rod 12 pulls the bridge deck 4 and keeps the bridge deck 4 stable. At this time, the temporary support device 13 is removed to complete the hoisting of the bridge deck 4.

[0059] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for constructing a pedestrian landscape bridge under an existing viaduct pier doorway, characterized in that: The steps include: When the viaduct box girder (1) is prefabricated, connecting parts are embedded at the designed positions on both sides of the lower part; After the viaduct construction and installation is completed, an upper hanging seat (3) is installed below the viaduct box girder (1), and the upper hanging seat (3) is fixed to the connecting piece; A hanger (10) is installed on a part of the upper hanging seat (3), a track (5) is installed on the hanger (10), the track (5) passes through the bridge pier doorway (2), and both sides of the bridge pier are respectively left empty to connect the upper hanging seats (3) of the bridge deck (4) of the pedestrian landscape bridge passing through the bridge pier doorway (2); then a plurality of hoist cranes (6) are installed on the track (5), and the hoist cranes (6) can move along the track (5); When the bridge deck (4) of the pedestrian landscape bridge is prefabricated, a lower hanging seat (11) is installed at a designed position; the prefabricated bridge deck (4) is transferred between two bridge piers and placed below the track (5); then the hoist (6) is connected to the bridge deck (4); the bridge deck (4) is lifted to a set height by the hoist (6); and then the hoist (6) is moved along the track (5) so that one end of the bridge deck (4) passes through the bridge pier door opening (2) until the bridge deck (4) reaches the top of the installation position; The bridge plate (4) is lowered to the installation position by means of a hoist (6), and then the corresponding lower hanging seat (11) and upper hanging seat (3) are connected by means of a hanging rod (12); The hoist (6), track (5) and hanger (10) are removed.

2. The method for constructing a pedestrian landscape bridge under an existing viaduct pier gate according to claim 1, characterized in that: After the viaduct is constructed and installed, the height of the bottom of the pier doorway (2) is measured, and a pad is cast at the bottom of the pier doorway (2). The height of the pad is determined by the measured height of the bottom of the pier doorway (2) and the height of the designed pedestrian landscape bridge. When the bridge deck (4) is lowered to the installation position, the bridge deck (4) is supported on the pad.

3. The method for constructing a pedestrian landscape bridge under an existing viaduct pier gate according to claim 1, characterized in that: The hoist (6) is pulled along the track (5) by a winch (7), and a plurality of hoist cranes (6) are connected to each other by a pull rope. The traction rope (8) of the winch (7) is connected to the hoist (6) in the front of the moving direction. The winch (7) is arranged on the ground, and the traction rope (8) of the winch (7) is turned by a guide wheel (9), and the guide wheel (9) is installed at one end of the track (5); after the bridge plate (4) is lowered to the installation position, the connection between the traction rope (8) and the hoist (6) is released.

4. The method for constructing a pedestrian landscape bridge under an existing viaduct pier gate according to claim 1, characterized in that: After the bridge plate (4) reaches the upper part of the installation position, the bridge plate (4) is first lowered to 10-20 cm above the installation position, and then the horizontal position of the bridge plate (4) is observed to see whether it meets the requirements. If the horizontal position of the bridge plate (4) does not meet the requirements, the hoist (6) is manually pushed with a push rod to fine-tune the position of the bridge plate (4) until the horizontal position of the bridge plate (4) meets the requirements, and then the bridge plate (4) is further lowered to the installation position.

5. The method for constructing a pedestrian landscape bridge under an existing viaduct pier gate according to claim 1, characterized in that: The pedestrian landscape bridge between two adjacent bridge piers is composed of at least three different bridge plates (4), two of which pass through two bridge pier doorways (2) respectively. During installation, the two bridge plates (4) passing through the bridge pier doorways (2) are first installed, and then the bridge plate (4) between the two bridge plates (4) passing through the bridge pier doorways (2) is installed.

6. The method for constructing a pedestrian landscape bridge under an existing viaduct pier doorway according to claim 5, characterized in that: The bridge deck (4) between two bridge decks (4) passing through the bridge pier doorway (2) is installed with the assistance of two gantry cranes, which are respectively arranged at both ends of the bridge deck (4) and are arranged across the bottom of the viaduct.

7. A method for constructing a pedestrian landscape bridge under an existing viaduct pier doorway, characterized in that: The steps include: When the viaduct box girder (1) is prefabricated, connecting parts are embedded at the designed positions on both sides of the lower part; After the viaduct construction and installation is completed, an upper hanging seat (3) is installed below the viaduct box girder (1), and the upper hanging seat (3) is fixed to the connecting piece; A hanger (10) is installed on the upper hanger seat (3), a track (5) is installed on the hanger (10), the track (5) runs through the bridge pier doorway (2), and then a plurality of hoist cranes (6) are installed on the track (5), and the hoist cranes (6) can move along the track (5); When the bridge deck (4) of the pedestrian landscape bridge is prefabricated, a lower hanging seat (11) is installed at a designed position; the prefabricated bridge deck (4) is transferred between two bridge piers and placed below the track (5); then the hoist (6) is connected to the bridge deck (4); the bridge deck (4) is lifted to a set height by the hoist (6); and then the hoist (6) is moved along the track (5) so that one end of the bridge deck (4) passes through the bridge pier door opening (2) until the bridge deck (4) reaches the top of the installation position; Temporary support devices (13) are respectively installed at both ends of the installation position of the bridge plate (4), and then the bridge plate (4) is lowered to the installation position by a hoist (6), and the two ends of the bridge plate (4) are respectively supported on the two temporary support devices (13), and then the hoist (6), the guide rail and the hanger (10) are removed; The corresponding lower suspension seat (11) and upper suspension seat (3) are connected using a suspension rod (12), and then the temporary support device (13) is removed.

8. The method for constructing a pedestrian landscape bridge passing under an existing viaduct pier doorway according to claim 7, characterized in that: The temporary support device (13) comprises a lifting platform vehicle, which is arranged on the ground below the bridge deck (4). The upper end of the lifting platform vehicle abuts against the bottom of the bridge deck (4) and supports the bridge deck (4). After the suspension rod (12) is installed, the lifting platform vehicle is lowered and driven away from below the bridge deck (4).

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