Cantilever bridge construction device and construction method thereof

Abstract

The present application relates to the field of bridge construction, and discloses a cantilever bridge construction device, which comprises a mobile trolley platform, a fixed construction platform and a hoisting mechanical unit; the mobile trolley platform comprises a first bridge deck rail, a trolley body and a hoisting support part; the trolley platform comprises a trolley lower platform and a trolley upper platform; the bottom of the trolley lower platform is provided with a plurality of pulleys; the hoisting support part comprises a boom, a bearing table and a jacking device; the boom is arranged at the lower end of the transverse extension part; the bearing table is arranged on the boom; the fixed construction platform comprises a fixed frame, a pouring platform and a formwork unit; the fixed frame is fixedly arranged at the bottom of the beam body; the pouring platform is arranged on the fixed frame; the bottom of the pouring platform is provided with a first through slot in the length direction; the first through slot is located above the jacking device; the hoisting mechanical unit comprises a second bridge deck rail and a hoisting machine; the present application aims to solve the technical problem of how to reduce the construction period of the cantilever bridge construction process.

Description

Technical Field

[0001] This invention relates to the field of bridge construction, and specifically discloses a cantilever bridge construction device and its construction method. Background Technology

[0002] The cantilever bridge construction method refers to the construction method in which working platforms are set up on both sides of the bridge piers, and beam segments are poured or assembled in a balanced manner towards the mid-span until the bridge structure is closed. The cantilever construction method can be divided into two categories: cantilever casting and cantilever assembly. The working principle of both can be summarized by three steps: moving the working platform (hanging basket or crane), positioning the construction beam segments (pouring or assembling), and connecting the construction beam segments (strong tension prestressing).

[0003] In existing technologies, hanging formwork construction is commonly used. This method allows for the gradual outward pouring of the beam, with each segment typically only a few meters apart. Furthermore, each pour requires the reinstallation of formwork, which presents certain limitations: 1. The construction period is relatively long, and the pouring length of each segment is too short; 2. The steel formwork has poor sealing and is prone to grout leakage; 3. The continuity of the entire beam is relatively poor, potentially leading to longitudinal linear inconsistencies.

[0004] One existing patent, 201410596949.2, describes an extended hanging basket for cast-in-place cantilever beam construction and its construction method. It involves welding identical, symmetrical left and right extension sections onto an existing hanging basket. The right extension section consists of multiple parallel channel steels welded to the slot of the front lower crossbeam I-beam, extending to the right along the longitudinal beam direction of the bottom basket to form a support platform. The length of this support platform in the longitudinal beam direction is the sum of the length of the beam to be cast and the length of the construction operation platform. Each channel steel has an inclined support below it, welded between the middle of the bottom surface of the channel steel and the crossbeam hanger. A layer of bamboo plywood is laid on top of the support platform, and protective railings are evenly welded along the outer right edge of the support platform. This invention extends the lower front crossbeam of the existing hanging basket and installs diagonal bracing between the extended section's bottom plate and the front beam to form a working platform. During the curing and strength equalization period after the front beam is poured, the reinforcement binding of the subsequent beam is carried out simultaneously, effectively shortening the construction cycle of the box girder segments. This method mainly increases the beam pouring length by extending the hanging basket's construction platform. However, this method has certain drawbacks, such as reduced load-bearing capacity after extension, increased risk of accidents, large overall weight and complex structure of the hanging basket, and relatively inconvenient movement. Therefore, improving the efficiency of cantilever bridge construction is crucial. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a cantilever bridge construction device and a construction method thereof to solve the technical problem of how to reduce the construction cycle of cantilever bridge construction.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A cantilever bridge construction device includes a mobile trolley platform, a fixed construction platform, and a hoisting machinery unit;

[0008] The mobile trolley platform includes a first bridge deck track, a trolley body, and a hoisting support. The first bridge deck track is laid on the beam. The trolley platform includes a lower trolley platform and an upper trolley platform. The upper trolley platform is located on the upper surface of the lower trolley platform. The bottom of the lower trolley platform is provided with several pulleys that can move on the first bridge deck track. The length of the upper trolley platform is greater than that of the lower trolley platform. The front end of the upper trolley platform forms a longitudinal extension that extends forward to the front of the lower trolley platform. The two sides of the upper trolley platform form transverse extensions that extend outward to the outside of the beam. The hoisting support includes a lifting rod, a support platform, and a lifting device. The lifting rod is located at the lower end of the transverse extensions. The support platform is located on the lifting rod, and the lifting device is located on the support platform.

[0009] The fixed construction platform includes a fixed frame, a pouring platform, and a formwork unit. The fixed frame is fixedly installed at the bottom of the beam. The pouring platform is installed on the fixed frame. A first through slot is formed along the length direction at the bottom of the pouring platform. The first through slot is located above the lifting equipment. The formwork unit includes a steel formwork and a wooden formwork. The steel formwork is located at the front and rear ends of the pouring platform. The steel formwork is detachably connected to the fixed frame. An installation plate is provided on the steel formwork. The wooden formwork is fixedly installed on the installation plate.

[0010] The hoisting machinery unit includes a second bridge deck track and hoisting machinery. The second bridge deck track is set on the beam, and the hoisting machinery is slidably set on the second bridge deck track.

[0011] This plan includes a fixed construction platform located at the bottom of the bridge beam. Its primary function is to cast the in-situ beam. After casting, a mobile trolley platform moves the beam to the front / rear end of the beam. Then, the mobile trolley platform and hoisting machinery jointly move the in-situ beam to the designated position, where it is finally cast together with the main beam. The advantages of this plan are: the in-situ beam is formed using formwork, unlike the hanging basket method. The length of the in-situ beam is significantly longer than with hanging basket construction, which typically involves 3-5 meters. With in-situ casting, only the size of the fixed construction platform and the transport capacity of the mobile trolley platform need to be considered. It is recommended that each in-situ beam be cast to a length of 10-20 meters. Therefore, this plan can improve the efficiency of the entire cantilever beam construction and reduce the construction period. Furthermore, the in-situ casting method avoids problems associated with hanging basket construction, such as poor sealing of the steel formwork leading to grout leakage. Of course, the drawback of this scheme is that if the mobile trolley platform has a large structural scale, it will cause the beam to bear too much load. If the structural scale is small, it will not be able to transport long cast-in-place beams. Therefore, the design of the casting length of the cast-in-place beam is very important and needs to be determined according to the scale of the entire bridge.

[0012] Optionally, the first bridge deck track includes a rectangular first track body, which is fixed to the beam by anchor bolts. Three first track slots are provided along the length of the first track body. The trolley lower platform includes a C-shaped lower platform, which is a steel frame structure. The lower platform wraps around both sides of the beam and is provided with a sliding mounting seat. A pulley seat is vertically slidably mounted on the sliding mounting seat, located in the middle first track slot. The two sides of the sliding mounting seat can be lifted by trolley jacks, and after being lifted, the sliding mounting seat can be fixedly connected to the pulley seat. In this solution, the first bridge deck track is mainly used for moving the trolley platform back and forth. Three first track slots are provided on the first bridge deck track. The middle first track slot is used to place the pulley seat, which can move within it. The other two first track slots are used to install the chain hoists of the traction machinery. The mobile trolley platform includes a lower platform, which comprises several lower sections. Each lower section is equipped with a sliding mounting seat, and the sliding mounting seat is fitted with a pulley seat, which can be fixedly connected to the sliding mounting seat. The steps for fixing the pulley seat to the sliding mounting seat are as follows: First, a trolley jack is used to lift the sliding mounting seat, which also lifts the entire mobile trolley platform upwards. Once the pulley seat and the sliding mounting seat are aligned, they are then fixedly connected. At this point, the entire mobile trolley platform is supported by the pulley seat, and the mobile trolley platform is then driven to move on the first track groove.

[0013] Optionally, a chain hoist can also be installed on the bridge beams, which is used to move the platform under the trolley. The chain hoist has good traction performance and safety, and can meet construction requirements.

[0014] Optionally, the trolley platform is equipped with an equipment platform, on which a winder is mounted. A steel strand is mounted on the winder, and a first through hole is provided on the equipment platform for the steel strand to pass through. A boom mount is located at the bottom of the first through hole. The boom includes an upper boom section and a lower boom section, both of which are hollow internally. The lower boom section is slidably fitted onto the lower end of the upper boom section. The upper and lower boom sections can be fixedly connected. The upper boom section is fixedly mounted on the boom mount, and the lower boom section is fixedly mounted on the support platform. In this design, the boom is configured with an upper boom section and a lower boom section, and the upper boom section can extend into the lower boom section, allowing both sections to retract. Therefore, when the winder is activated, the upper and lower boom sections can retract. The entire boom serves to protect the steel strand. Since the upper and lower ends of the boom are fixedly mounted on the boom mount and the support platform respectively, the support platform will not sway horizontally, and it can remain stable during windy weather.

[0015] Optionally, the fixing frame includes a horizontal fixing part and a vertical fixing part. The horizontal fixing part is fixedly installed at the bottom of the beam, and the vertical fixing part is a steel frame structure, vertically fixed to the horizontal fixing part. The pouring platform is horizontally fixed to the vertical fixing part. Both the pouring platform and the vertical fixing part are provided with several clamping plates for installing and limiting the wooden formwork. Hinged seats are provided on the front and rear sides of the vertical fixing part, and the steel formwork is connected to the hinged seats. A fixing buckle is provided at the bottom of the steel formwork, which can be fixed to the pouring platform. A sealing ring is detachably installed on the steel formwork. In this solution, because the steel formwork and the pouring platform have sufficient load-bearing capacity for concrete pouring, wooden formwork can be used. The wooden formwork can also be made of disposable wood, and forced removal can be used when dismantling it, resulting in higher efficiency. The steel formwork is hinged on the vertical fixing part, which can be flipped, making the installation and disassembly of the steel formwork very convenient. In addition, the steel formwork is equipped with a sealing ring for sealing, which can solve the problem of grout leakage during pouring.

[0016] The construction method for cantilever bridge construction equipment includes the following steps:

[0017] S1, Install the mobile trolley platform, fixed construction platform and hoisting machinery unit on the beam;

[0018] S2, Install wooden formwork on the pouring platform of the fixed construction platform. After the wooden formwork is installed, fix the steel formwork with the fixing clips and then pour concrete into the wooden and steel formwork, wait for the concrete to form and then form a cast-in-place beam.

[0019] S3, remove the steel formwork. If the steel formwork is fixed at the joint with the formwork and cannot be removed, manually destroy the wooden formwork. Then start the lifting equipment on the support platform. The lifting equipment contacts the bottom of the cast-in-place beam and lifts it up. Then start the mobile trolley platform and hoisting machinery unit to move forward. The mobile trolley platform transports the cast-in-place beam to the end of the beam body. Then move the support platform upward to the designated position. If there is a deviation in the position of the cast-in-place beam, the hoisting machinery can be used to hoist the cast-in-place beam to the designated position. After the position is leveled and aligned, formwork is erected between the cast-in-place beam and the beam body and concrete is poured. Wait for the concrete to form so that the cast-in-place beam and the beam body are connected.

[0020] S4, when the mobile trolley platform is started, the pouring platform installs steel formwork and new wooden formwork and carries out the pouring construction of the cast-in-place beam again;

[0021] S5. After the cast-in-place beam and the beam body are connected, start the mobile trolley platform and the hoisting mechanical unit to reset. After the new cast-in-place beam is cast and formed, repeat step S3 to connect the new cast-in-place beam to the beam body.

[0022] Optionally, in S3, the mobile trolley platform is driven by a chain hoist, and the hoisting machinery unit can also be driven by a chain hoist. If the hoisting machinery unit has a driver, it can also move on its own. Before the mobile trolley platform moves, the trolley jack is started and the sliding mounting seat is lifted up a certain distance. Then the sliding mounting seat is fixed to the pulley seat, and then the chain hoist is used for traction. After the mobile trolley platform is in place, the trolley jack is used to lift it up and then the fixing structure of the sliding mounting seat and the pulley seat is removed so that the sliding mounting seat contacts the first bridge deck track. Alternatively, anchor rods can be used to fix the sliding mounting seat on the first bridge deck track.

[0023] Optionally, in S3, before the support platform moves upward, the fixed connection structure between the upper and lower rods needs to be loosened, and then the winder is started. The winder winds the steel strand and drives the support platform to move upward. During the process, the upper rod gradually moves into the interior of the lower rod, and the length of the entire suspension rod becomes smaller.

[0024] The working principle and beneficial effects of this solution are as follows:

[0025] The main inventive point of this solution is as follows: This solution includes a mobile trolley platform and a fixed construction platform. The mobile trolley platform is similar to the existing hanging basket structure, but unlike the hanging basket structure, it does not require the pouring of bridge beams, making the overall structure of the mobile trolley platform much simpler than the hanging basket structure. The fixed construction platform is fixedly positioned below the beam for casting the in-situ beam. Using a fixed platform for casting is practically indistinguishable from the effect of precast in-situ beams. After the in-situ beam is poured, it is hoisted to the designated position using the mobile trolley platform and hoisting machinery, and then connected to both sides of the beam using in-situ casting connections. In existing hanging basket construction, due to the large and complex structure, the length of the beam poured in a single operation is only about 3-5 meters, resulting in relatively low efficiency. Furthermore, the method of moving the hanging basket is too complex, time-consuming, and labor-intensive. The mechanical structure and construction method in this solution can improve construction efficiency and reduce the construction period to a certain extent. However, it is important to note the load-bearing capacity of the beam in this plan. The casting length of the cast-in-place beam, the size of the mobile trolley platform, and the fixed construction platform should be selected based on the load-bearing capacity. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an embodiment;

[0027] Figure 2 This is a structural diagram of the mobile trolley platform;

[0028] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0029] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0030] Figure 5 for Figure 2 Enlarged view of point C in the middle;

[0031] Figure 6 A structural diagram of the lower platform from an upward view;

[0032] Figure 7 This is a structural diagram of a fixed construction platform.

[0033] The following are the markings in the attached diagram: 1. Pier; 2. Beam; 3. First bridge deck track; 4. Second bridge deck track; 5. Mobile trolley platform; 6. Hanger; 7. Support platform; 8. Fixed construction platform; 9. Lifting machinery unit; 10. Lower trolley platform; 11. Upper trolley platform; 12. Longitudinal extension; 13. Lateral extension; 14. Winder; 15. Equipment platform; 16. Hanger installer; 17. Upper rod; 18. Lower rod; 19. Sliding mounting seat; 20. First track groove; 21. Lower platform; 22. Pulley seat; 23. Trolley jack; 24. Horizontal fixing part; 25. Vertical fixing part; 26. Pouring platform; 27. Clamping plate; 28. Installation piece; 29. ​​First through groove; 30. Steel formwork; 31. Wooden formwork. Detailed Implementation

[0034] The following detailed description illustrates the specific implementation method:

[0035] Example

[0036] A cantilever bridge construction device, such as Figures 1-7 As shown, it includes a mobile trolley platform 5, a fixed construction platform 8, and a hoisting machinery unit 9;

[0037] The bridge in this embodiment includes piers 1 and beams 2. The beams 2 are set on the piers 1 and are constructed by cast-in-place. The length of the cast-in-place beams 2 is determined according to the design.

[0038] Combination Figure 1 , Figure 5 The mobile trolley platform 5 includes a first bridge deck track 3, a trolley body, and a hoisting support. The first bridge deck track 3 is laid on the beam 2. The first bridge deck track 3 includes a rectangular first track body, which is fixed to the beam 2 by anchor rods or bolts. Three first track grooves 20 are arranged side by side along the length of the first track body. The middle first track groove 20 and the first track grooves on both sides have different functions.

[0039] Combination Figure 2 , Figure 6The trolley body includes a lower platform 10 and an upper platform 11. The lower platform 10 includes six C-shaped lower platform sections 21, which are steel frame structures. Three lower platform sections 21 form a group, with two groups distributed on both sides of the beam 2. The middle part of each lower platform section 21 fits onto the side of the beam 2, allowing it to move along its length. The three lower platform sections 21 in the same group are connected by a steel frame structure, and two groups of lower platform sections 21 can also be connected by a steel frame structure, depending on the width of the beam 2 and the stability of the lower platform section 21. A sliding mounting seat 19 is provided at the bottom of each lower platform section 21. A pulley seat 22 is vertically slidably mounted on the sliding mounting seat 19, located in the middle first track groove 20. The two sides of the sliding mounting seat 19 can be lifted by the trolley jack 23, and after being lifted, the sliding mounting seat 19 can be fixedly connected to the pulley seat 22. A pulley is provided on the pulley seat 22, and both the pulley seat 22 and the pulley are located in the first track groove 20 in the middle of the first track body. A chain hoist can also be installed on the bridge beam 2, which is used to move the lower platform 10 of the trolley. The chain hoist on the chain hoist can be placed into the two first track grooves 20 on both sides of the first track body and then connected to the sliding mounting seat 19.

[0040] Combination Figure 3 The upper platform 11 of the trolley is located on the upper end face of the lower platform 21 of the lower platform 10. The length of the upper platform 11 is greater than that of the lower platform 10. The front end of the upper platform 11 forms a longitudinal extension 12 extending forward to the front of the lower platform 10, and the sides of the upper platform 11 form transverse extensions 13 extending outward to the outside of the beam 2. The upper platform 11 is equipped with an equipment platform 15, which is located at the bottom of the transverse extensions 13. A winder 14 is installed on the equipment platform 15, and a steel strand is installed on the winder 14. The equipment platform 15 has a first through hole for the steel strand to pass through, and a hanger 16 is installed at the bottom of the first through hole.

[0041] The hoisting support includes a hoisting rod 6, a support platform 7, and a lifting device. The hoisting rod 6 is located at the lower end of the transverse extension 13, the support platform 7 is mounted on the hoisting rod 6, and the lifting device is mounted on the support platform 7. The hoisting rod 6 includes an upper rod portion 17 and a lower rod portion 18, both of which are hollow internally. The lower rod portion 18 is slidably sleeved on the lower end of the upper rod portion 17, and the upper rod portion 17 and the lower rod portion 18 can be fixedly connected. The upper rod portion 17 is fixedly mounted on the hoisting rod installer 16, and the lower rod portion 18 is fixedly mounted on the support platform 7.

[0042] Combination Figure 7The fixed construction platform 8 includes a fixing frame, a pouring platform 26, and formwork units. The fixing frame is fixedly installed at the bottom of the beam 2, and the pouring platform 26 is installed on the fixing frame. The fixing frame includes a horizontal fixing part 24 and a vertical fixing part 25. The horizontal fixing part 24 is fixedly installed at the bottom of the beam 2, and the vertical fixing part 25 is a steel frame structure, vertically fixed on the horizontal fixing part 24. The pouring platform 26 is horizontally fixed on the vertical fixing part 25. A first through groove 29 is provided on the pouring platform 26. The formwork unit includes a steel formwork 30 and a wooden formwork 31. The steel formwork 30 is located at the front and rear ends of the pouring platform 26. The steel formwork 30 is detachably connected to the fixing frame. An installation plate 28 is provided on the steel formwork 30, and the wooden formwork 31 is fixedly installed on the installation plate 28. Several clamping plates 27 are detachably installed on both the pouring platform 26 and the vertical fixing part 25. The clamping plates 27 are used to install and limit the wooden formwork 31. Hinges are provided on the front and rear sides of the vertical fixing part 25. The steel formwork 30 is connected to the hinges. A fixing buckle is provided at the bottom of the steel formwork 30, which can be fixed to the pouring platform 26. A sealing ring is detachably provided on the steel formwork 30.

[0043] The bottom of the pouring platform 26 has a through-hole 29 along its length, and the through-hole 29 is located above the lifting equipment.

[0044] The hoisting machinery unit 9 includes a second bridge deck track 4 and hoisting machinery. The second bridge deck track 4 is mounted on the beam 2, and the hoisting machinery is slidably mounted on the second bridge deck track 4. The hoisting machinery is a well-established existing technology, and its structure is not within the scope of protection of this application; therefore, its structure will not be described in detail. There are many types of hoisting machinery in the prior art; a suitable model can be selected according to the site requirements.

[0045] The construction method for cantilever bridge construction equipment includes the following steps:

[0046] S1, Install the mobile trolley platform 5, the fixed construction platform 8, and the hoisting machinery unit 9 on the beam 2;

[0047] S2, Install wooden formwork 31 on the pouring platform 26 of the fixed construction platform 8. After the wooden formwork 31 is installed, fix the steel formwork 30 with the pouring platform 26. Then pour concrete into the wooden formwork 31 and the steel formwork 30 and wait for the concrete to form to form a cast-in-place beam.

[0048] S3, remove the steel formwork 30. If the steel formwork 30 cannot be removed from the joint with the wooden formwork 31, manually break the wooden formwork 31. Then, start the lifting equipment on the support platform 7. The lifting equipment contacts the bottom of the cast-in-place beam and lifts it up. Then, start the moving trolley platform 5 and the hoisting machinery unit 9 to move forward. The moving trolley platform 5 transports the cast-in-place beam to the end of the beam body 2. Then, move the support platform 7 upward to the designated position. If there is a deviation in the position of the cast-in-place beam, the hoisting machinery can be used to hoist the cast-in-place beam to the designated position. After the position is leveled and aligned, formwork is erected between the cast-in-place beam and the beam body 2 for concrete pouring. Wait for the concrete to form so that the cast-in-place beam and the beam body 2 are connected. The moving trolley platform 5 is driven by a chain hoist. The hoisting machinery unit 9 can also be driven by a chain hoist. If the hoisting machinery unit 9 has a drive mechanism... The actuator can also move on its own; before the moving trolley platform 5 moves, start the trolley jack 23 and lift the sliding mounting seat 19 upward a certain distance, then fix the sliding mounting seat 19 to the pulley seat 22, and then use a chain hoist for traction; after the moving trolley platform 5 is in place, use the trolley jack 23 to lift it and then remove the fixing structure of the sliding mounting seat 19 and the pulley seat 22 so that the sliding mounting seat 19 contacts the first bridge deck track 3. Anchor rods can also be used to fix the sliding mounting seat 19 to the first bridge deck track 3; before the bearing platform 7 moves upward, the fixing connection structure of the upper rod 17 and the lower rod 18 needs to be loosened first, and then the winder 14 is started. The winder 14 winds the steel strand and drives the bearing platform 7 to move upward. During the process, the upper rod 17 gradually moves into the interior of the lower rod 18, and the length of the entire lifting rod 6 becomes smaller;

[0049] S4, when the mobile trolley platform 5 is started, the pouring platform 26 installs the steel formwork 30 and the new wooden formwork 31 and carries out the pouring construction of the cast-in-place beam again;

[0050] S5. After the cast-in-place beam and beam body 2 are connected, start the mobile trolley platform 5 and the hoisting mechanical unit 9 to reset. After the new cast-in-place beam is cast and formed, repeat step S3 to connect the new cast-in-place beam to beam body 2.

[0051] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics in the solutions is not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or its practicality.

Claims

1. A cantilever bridge construction device, characterized in that: Includes mobile trolley platforms, fixed construction platforms, and hoisting machinery units; The mobile trolley platform includes a first bridge deck track, a trolley body, and a hoisting support. The first bridge deck track is laid on the beam. The trolley platform includes a lower trolley platform and an upper trolley platform. The upper trolley platform is located on the upper surface of the lower trolley platform. The bottom of the lower trolley platform is provided with several pulleys that can move on the first bridge deck track. The length of the upper trolley platform is greater than that of the lower trolley platform. The front end of the upper trolley platform forms a longitudinal extension that extends forward to the front of the lower trolley platform. The two sides of the upper trolley platform form transverse extensions that extend outward to the outside of the beam. The hoisting support includes a lifting rod, a support platform, and a lifting device. The lifting rod is located at the lower end of the transverse extensions. The support platform is located on the lifting rod, and the lifting device is located on the support platform. The fixed construction platform includes a fixing frame, a pouring platform, and a formwork unit. The fixing frame is fixedly installed at the bottom of the beam. The pouring platform is installed on the fixing frame. A first through groove is formed along the length direction at the bottom of the pouring platform. The first through groove is located above the lifting equipment. The formwork unit includes a steel formwork and a wooden formwork. The steel formwork is located at the front and rear ends of the pouring platform. The steel formwork is detachably connected to the fixing frame. An installation plate is provided on the steel formwork. The wooden formwork is fixedly installed on the installation plate. The hoisting machinery unit includes a second bridge deck track and hoisting machinery. The second bridge deck track is set on the beam, and the hoisting machinery is slidably set on the second bridge deck track. The fixing frame includes a horizontal fixing part and a vertical fixing part. The horizontal fixing part is fixedly installed at the bottom of the beam. The vertical fixing part is a steel frame structure and is vertically fixed to the horizontal fixing part. The pouring platform is horizontally fixed to the vertical fixing part. Several clamping plates are provided on both the pouring platform and the vertical fixing part. The clamping plates are used to install and limit the wooden template. Hinged seats are provided on the front and rear sides of the vertical fixing part. The steel template is connected to the hinged seats. The bottom of the steel template is provided with a fixing buckle. The fixing buckle is fixed to the pouring platform. A sealing ring is detachably installed on the steel template.

2. The cantilever bridge construction device according to claim 1, characterized in that: The first bridge deck track includes a rectangular first track body, which is fixed to the beam by anchor bolts. Three first track grooves are provided on the first track body along its length. The trolley lower platform includes a C-shaped lower platform, which is a steel frame structure. The lower platform wraps around both sides of the beam and is provided with a sliding mounting seat. A pulley seat is vertically slidably mounted on the sliding mounting seat. The pulley seat is located in the middle of the first track groove. The two sides of the sliding mounting seat are lifted by trolley jacks, and the sliding mounting seat is fixedly connected to the pulley seat after being lifted.

3. The cantilever bridge construction device according to claim 2, characterized in that: A chain hoist is installed on the bridge beam, which is used to move the platform under the trolley.

4. The cantilever bridge construction device according to claim 3, characterized in that: The trolley platform is equipped with an equipment platform, on which a winder is installed. A steel strand is installed on the winder. The equipment platform has a first through hole for the steel strand to pass through, and a rod mounter is installed at the bottom of the first through hole. The rod includes an upper rod and a lower rod, both of which are hollow inside. The lower rod is slidably sleeved on the lower end of the upper rod. The upper rod and the lower rod are fixedly connected. The upper rod is fixedly mounted on the rod mounter, and the lower rod is fixedly mounted on the support platform.

5. The construction method of the cantilever bridge construction device according to claim 1, characterized in that, Includes the following steps: S1, Install the mobile trolley platform, fixed construction platform and hoisting machinery unit on the beam; S2, Install wooden formwork on the pouring platform of the fixed construction platform. After the wooden formwork is installed, fix the steel formwork with the fixing clips and then pour concrete into the wooden and steel formwork, wait for the concrete to form and then form a cast-in-place beam. S3, remove the steel formwork. If the steel formwork is fixed at the joint with the formwork and cannot be removed, manually destroy the wooden formwork. Then start the lifting equipment on the support platform. The lifting equipment contacts the bottom of the cast-in-place beam and lifts it up. Then start the mobile trolley platform and hoisting machinery unit to move forward. The mobile trolley platform transports the cast-in-place beam to the end of the beam body. Then move the support platform upward to the designated position. If there is a deviation in the position of the cast-in-place beam, the hoisting machinery can be used to hoist the cast-in-place beam to the designated position. After the position is leveled and aligned, formwork is erected between the cast-in-place beam and the beam body and concrete is poured. Wait for the concrete to form so that the cast-in-place beam and the beam body are connected. S4, when the mobile trolley platform is started, the pouring platform installs steel formwork and new wooden formwork and carries out the pouring construction of the cast-in-place beam again; S5. After the cast-in-place beam and the beam body are connected, start the mobile trolley platform and the hoisting mechanical unit to reset. After the new cast-in-place beam is cast and formed, repeat step S3 to connect the new cast-in-place beam to the beam body.

6. The construction method of the cantilever bridge construction device according to claim 5, characterized in that: In S3, the mobile trolley platform is driven by a chain hoist, and the hoisting machinery unit can also be driven by a chain hoist. If the hoisting machinery unit has a driver, it can also move on its own. Before the mobile trolley platform moves, the trolley jack is started and the sliding mounting seat is lifted up a certain distance. Then the sliding mounting seat is fixed to the pulley seat, and then the chain hoist is used for traction. After the mobile trolley platform is in place, the trolley jack is used to lift it up and then the fixing structure of the sliding mounting seat and the pulley seat is removed so that the sliding mounting seat contacts the first bridge deck track. Anchor rods can also be used to fix the sliding mounting seat to the first bridge deck track.

7. The construction method of the cantilever bridge construction device according to claim 6, characterized in that: In S3, before the support platform moves upward, the fixed connection structure between the upper and lower rods needs to be loosened. Then, the winder is started. The winder winds the steel strand and drives the support platform to move upward. During the process, the upper rod gradually moves into the interior of the lower rod, and the length of the entire rod decreases.

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