Method and equipment for quickly erecting bridge of urban reconstruction and extension project

Abstract

The invention provides a method and equipment for quickly erecting a bridge of an urban reconstruction and extension project. The method comprises the following steps: S1, transporting a beam to the head of a bridge girder erection machine by a beam transporting vehicle; s2, the crown block moves to the front, a rear support is folded upwards, and a beam transporting vehicle carries a beam to enter; s3, the beam transporting vehicle completely enters, and the rear support recovers to the supporting state; s4, the middle support is folded upwards, and the crown block lifts the box girder; s5, the crown block moves the box girder in place, puts down the box girder and fixes the box girder; releasing the connection between the crown block and the box girder; s6, the middle support is put down and supported to the beam surface, the rear support is folded upwards, and the beam transporting vehicle is moved out; s7, moving the bridge erecting machine to the next erecting position; and S8, the steps S1-S7 are repeated until all box girders are erected. The device can adapt to the construction environment where cantilever welding is needed or the supporting positions of the supporting legs are not enough, is suitable for rapid erection of large box girders, is better in adaptability, reduces the construction difficulty, and guarantees the construction convenience; in the erecting process, the temporary use of the external space is small, and existing traffic facilities cannot be affected.

Description

Technical Field

[0001] The present invention relates to the technical field of beam bridge erection, and particularly to a method and equipment for rapid erection of beam bridges in urban reconstruction and expansion projects. Background Art

[0002] Urban reconstruction and expansion is an activity of transforming and expanding existing areas, facilities, etc. in the city, which is a process of continuous self-renewal in urban development, including beam bridge erection projects; the so-called beam bridge erection project means that during the reconstruction and expansion process, capping beams or box girders are installed according to the expected route.

[0003] With the development of bridge construction technology, the span of the integral steel box girder bridge is getting larger and larger, with the maximum span up to 53m, and the width is large, reaching 34.5m, the weight reaches 1100t, the bridge deck span reaches 50m, and the cantilever of the steel box girder end is installed deep into the pier top.

[0004] For traditional single-beam erection equipment, such as highway bridge erecting machines, the maximum erected beam section is about 300t. Using the construction method of traditional highway bridge erecting machines, the main beam spacing is small, and the leg space cannot meet the beam erection requirements either.

[0005] For railway box girder bridge erecting machines, they can erect 1000t railway box girders. However, the width of railway box girders is about 12.7m, which is small. The trough-shaped legs are used to feed the beams to meet the installation requirements. But for this kind of steel box girder with a large width and the requirement of maintaining traffic, if trough-shaped legs are used, the legs are too wide and heavy, and the supporting beams on both sides of the trough are cantilevered deep into the outside of the bridge, affecting traffic.

[0006] At the same time, during the erection of some box girders, especially due to different construction requirements, cantilever welding is required. When the existing erection methods and equipment are erected, their front supports generally need to be supported on the piers. When erected by the cantilever welding method, the front supports cannot be supported on the piers, which is inconvenient to operate and the construction period is relatively long. Summary of the Invention

[0007] The main purpose of the present invention is to provide a method and equipment for rapid erection of beam bridges in urban reconstruction and expansion projects, so as to solve the problems of inconvenient operation and low efficiency of the existing construction methods.

[0008] To solve the above technical problems, the technical solutions adopted by the present invention are as follows: A method for rapid erection of beam bridges in urban reconstruction and expansion projects includes the following steps: S1. The beam transport vehicle transports the beam to the head of the bridge erecting machine; S2. The overhead crane moves forward, and the rear support folds upward, and the beam transport vehicle carries the beam into it; S3. When the beam transport vehicle completely enters, the rear support returns to the supporting state; S4. The middle support folds upward, and the overhead crane hoists the box girder; S5. The overhead crane moves the box girder into position, lowers the box girder, and fixes the box girder. Disconnect the connection between the overhead crane and the box girder. S6. The middle support is lowered and supported on the beam surface, the rear support is folded upward, and the beam transporter is moved out. S7. The bridge erecting machine moves to the next erection position. S8. Repeat S1 - S7 until all box girders are erected.

[0009] In the preferred solution, S7 includes the following steps: S71. The rear support rotates to the vertical state, the trolley at the bottom of the rear support is lowered, and the middle support is retracted. S72. The trolley at the bottom of the rear support works to drive the bridge erecting machine to move, so that the middle support approaches the front support. S73. The middle support resumes support, and the front support is retracted. S74. The front support moves to the next pier position, a support frame is set up, and the support of the front support is completed.

[0010] In the preferred solution, the support frame is set on the side of the pier, and the bottom of the front support is placed on the top of the support frame. The support frame is located on the side of the pier away from the box girder that has been installed.

[0011] In the preferred solution, in S74, the support frame is directly connected to the front support, and the connection process includes the following steps: S741. The front support is lifted up. S742. The front support moves along the main beam of the bridge erecting machine to the expected position. S743. The front support is lowered, and the bottom of the front support is connected to the pier through the support frame, and the fixation of the front support is completed. The front support is away from the pier.

[0012] In the preferred solution, the distance that the front support is away from the pier is not less than the length that the box girder extends beyond the pier.

[0013] The beam bridge rapid erection equipment for urban reconstruction and expansion projects includes a main beam. A number of overhead cranes are provided on the top of the main beam, and the overhead cranes are slidably connected to the main beam; the overhead cranes are used for lifting box girders. A rear support, a middle support and a front support are provided below the main beam. The rear support and the middle support are rotatably connected to the main beam. The front support is connected to the pier through a support frame.

[0014] In the preferred solution, the rear support includes a first support seat fixed to the main beam, and the first support seat is hinged to a first support arm through a first hinge. First connection frames are provided on the sides of the first support seat and the first support arm. The first support base and the first connecting frame of the first support arm are connected by a first hydraulic cylinder, and the connection modes at both ends of the first hydraulic cylinder are hinged; A fixed seat is provided at the bottom of the first support arm, and a fixed plate is provided on the side of the fixed seat; A plurality of second hydraulic cylinders are provided on the fixed plate, a movable frame is provided at the output end of the second hydraulic cylinder, and rollers are provided at the bottom of the movable frame.

[0015] In a preferred solution, the middle support includes a second support base fixed to the main beam, and the second support base is hinged to the second support arm through a second hinge; Second connecting frames are provided on both the second support base and the side of the second support arm; The second connecting frames of the second support base and the second support arm are connected by a third hydraulic cylinder, and the connection modes at both ends of the third hydraulic cylinder are hinged; A fixed column is provided at the bottom of the second support arm.

[0016] In a preferred solution, the support frame is a bracket, and the bracket is fixedly connected to the side of the pier; The front support includes a connecting seat, and the top of the connecting seat is slidably connected to the main beam through a leg pulley; A leg is provided at the bottom of the connecting seat, and the leg is arranged on the top of the bracket.

[0017] In a preferred solution, the front support includes a connecting seat, and the top of the connecting seat is slidably connected to the main beam through a leg pulley; A support leg is hinged to the connecting seat through a third hinge; Fourth hydraulic cylinders are provided on the side of the support leg and the connecting seat, and both ends of the fourth hydraulic cylinder are respectively hinged to the support leg and the connecting seat; A support frame is provided at the bottom of the support leg; the support frame includes a support plate fixed to the bottom of the support leg; Two side plates are provided at the bottom of the support plate, and a connecting sleeve is provided on the side of the support plate and the side plate close to the pier; A groove is provided on the side of the connecting sleeve away from the side plate; A plurality of fixing buckles are hinged to the side of the connecting sleeve away from the side plate through a hinge block; One side of the fixing buckle is concave in arc, and the concave arc surface abuts against the outer peripheral surface of the pier; A fixing block is provided on the side of the side plate, and a fifth hydraulic cylinder is provided between the fixing block and the fixing buckle; One end of the fifth hydraulic cylinder is hinged to the fixing block, and the other end is hinged to the fixing buckle.

[0018] The present invention provides a method and equipment for quickly erecting a beam bridge in an urban reconstruction and expansion project. By adopting the above solutions, the following beneficial effects are achieved: 1. It can adapt to the construction environment where cantilever welding is required or the position for leg support is insufficient, has better adaptability, and ensures the convenience of construction.

[0019] 2. It is applicable to the erection of large box girders, reducing the construction difficulty and facilitating the rapid erection of large box girders.

[0020] 3. During the erection process, it occupies little external space, thus not affecting the use of existing traffic.

[0021] 4. It is convenient to support the front support on the side of the pier, which can not only ensure stable support but also guarantee the construction efficiency.

[0022] 5. The whole erection process is simple to operate and has a low construction difficulty, ensuring the efficiency of rapid erection of beam bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the drawings and embodiments: Figure 1 It is a schematic structural diagram before the box girder of the present invention is transported in; Figure 2 It is a schematic structural diagram when the box girder of the present invention is transported in; Figure 3 It is a schematic structural diagram after the box girder of the present invention is transported in; Figure 4 It is a schematic structural diagram when the box girder of the present invention is lifted; Figure 5 It is a schematic structural diagram when the box girder of the present invention is put down; Figure 6 It is a schematic structural diagram when the beam transporter of the present invention is removed; Figure 7 It is a schematic structural diagram after the beam transporter of the present invention is removed; Figure 8 It is a schematic structural diagram after the main beam of the present invention is displaced; Figure 9 It is a schematic structural diagram after the displacement of the main beam of the present invention is completed; Figure 10 It is a schematic structural diagram of the rear support of the present invention; Figure 11 It is a schematic structural diagram of the middle support of the present invention; Figure 12 It is a schematic structural diagram of an embodiment of the front support of the present invention; Figure 13 It is a schematic structural diagram of an embodiment of the front support of the present invention; Figure 14 It is a top view structural diagram of the support plate of the present invention.

[0024] In the figure: Pier 101, box girder 102, main girder 2, overhead crane 201, rear support 3, first support seat 301, first support arm 302, first hinge 303, first connecting frame 304, first hydraulic cylinder 305, fixed seat 306, fixed plate 307, second hydraulic cylinder 308, movable frame 309, roller 310, middle support 4, second support seat 401, second support arm 402, second hinge 403, second connecting frame 404, third hydraulic cylinder 405, fixed column 406, front support 5, connecting seat 501, leg pulley 502, leg 503, support leg 504, third hinge 505, fourth hydraulic cylinder 506, support plate 507, side plate 508, connecting sleeve 509, groove 510, fixed buckle 511, hinge block 512, fixed block 513, fifth hydraulic cylinder 514, bracket 6. Detailed implementation mode

[0025] Example 1: As Figures 1-9 shown, the rapid erection method of beam bridges in urban reconstruction and expansion projects includes the following steps: S1. As Figure 1 shown, use an existing beam transporter to transport the box girder to the head of the bridge erecting machine; in this application, the main girder and overhead crane of the bridge erecting machine preferably adopt the structure of an existing bridge erecting machine.

[0026] S2. As Figure 2 shown, move the overhead crane of the bridge erecting machine forward and fold the rear support upward. At this time, the overall balance of the bridge erecting machine can be maintained, and then the beam transporter can carry the beam in. S3. As Figure 3 and 4 shown, after the beam transporter completely enters, the rear support returns to the supporting state; S4. Then fold the middle support upward to facilitate the subsequent beam transportation by the overhead crane; The overhead crane hoists the box girder. The connection method between the overhead crane and the box girder can be through an existing method, such as using the steel rope of the overhead crane for connection; S5. As Figure 5 shown, after the overhead crane moves the box girder in place, lower the box girder and then fix the box girder according to the construction requirements; after the box girder is fixed, cancel the connection between the overhead crane and the box girder, S6. As Figure 6 shown, lower the middle support and support it on the beam surface, fold the rear support upward, and the beam transporter moves out; After the beam transporter moves out, it goes to the box girder storage location to install a new box girder and prepares for the erection of the next box girder.

[0027] S7. As Figure 7 , 8 and 9 shown, the bridge erecting machine moves to the next erection position; Specifically, it includes the following steps: S71. Rotate the rear support to the vertical state, lower the trolley at the bottom of the rear support, and retract the middle support. S72. The trolley at the bottom of the rear support operates. The trolley at the bottom of the rear support is a commonly used mobile trolley for existing bridge erecting machines, and is controlled and moved in the existing manner, driving the bridge erecting machine to move, so that the middle support approaches the front support. During this process, the front support moves along the main beam through the leg pulley at the top. The leg pulley is the leg pulley used for connecting the main beam and the leg of the existing bridge erecting machine, so it will not be elaborated here.

[0028] S73. The middle support resumes support, and the front support is retracted. S74. The front support moves to the position of the next pier, and a support frame is set up. The support frame is set on the side of the pier, and the bottom of the front support is placed on the top of the support frame; the support frame is located on the side of the pier away from the installed box girder. Then complete the support of the front support; specifically, the support frame is directly connected to the front support, and the connection process includes the following steps: S741. Lift up the front support. S742. The front support moves along the main beam of the bridge erecting machine to the expected position. S743. Lower the front support, and the bottom of the front support is connected to the pier through the support frame to complete the fixation of the front support. Preferably, the front support is far away from the pier, and the distance between the front support and the pier is not less than the length of the box girder extending beyond the pier; thus, while ensuring the support, it is convenient for cantilever welding of the box girder.

[0029] S8. Repeat S1 - S7 until all box girders are erected.

[0030] Through the above method, it is possible to facilitate the rapid completion of the cantilever welding of box girders, especially the erection of large box girders, and it can also be used for the erection of ordinary box girders. The operation is simple and the construction difficulty is reduced.

[0031] Embodiment 2: As Figures 1-12 shown, the beam bridge rapid erection equipment for urban reconstruction and expansion projects includes a main beam 2. There are several overhead cranes 201 on the top of the main beam 2, and the overhead cranes 201 are slidably connected to the main beam 2; the overhead cranes 201 are used for lifting box girders 102; the overhead cranes 201 and the main beam 2 are the common structures and connection methods of existing bridge erecting machines. The overhead cranes 201 move, connect box girders and lift box girders in the existing manner, such as steel rope connection, so it will not be elaborated here. There are a rear support 3, a middle support 4 and a front support 5 below the main beam 2; the rear support 3 and the middle support 4 are rotatably connected to the main beam 2; the front support 5 is connected to the pier 101 through a support frame.

[0032] During use, lift, move and place the box girder through the overhead crane 201, and complete the overall erection of the box girder and the movement of the bridge erecting machine through the cooperation of the rear support 3, the middle support 4 and the front support 5.

[0033] In a further embodiment, as Figure 10 shown, the rear support 3 includes a first support seat 301 fixed to the main beam 2. The first support seat 301 is hinged to a first support arm 302 through a first hinge 303. The first hinge 303 is an existing hinge structure. First connection frames 304 are provided on the sides of both the first support seat 301 and the first support arm 302. The first connection frames 304 of the first support seat 301 and the first support arm 302 are connected by a first hydraulic cylinder 305. The connection modes at both ends of the first hydraulic cylinder 305 are hinge connections. A fixed seat 306 is provided at the bottom of the first support arm 302, and a fixed plate 307 is provided on the side of the fixed seat 306. A number of second hydraulic cylinders 308 are provided on the fixed plate 307. The first hydraulic cylinder 305 and the second hydraulic cylinders 308 are common fixed hydraulic cylinders used in existing bridge erection machines, and the hydraulic system is driven, controlled, and connected in an existing manner. A movable frame 309 is provided at the output end of the second hydraulic cylinder 308. Rollers 310 are provided at the bottom of the movable frame 309. The rollers 310 are rollers with a driving structure, such as a roller mechanism with a motor, or a hub motor is directly used, or a trolley mechanism used in the legs of existing bridge erection machines. When in use, the driving structure (such as motor drive) of the rollers 310 drives the rollers 310 to rotate, so that the rollers 310 can move along the box girder.

[0034] When in use, by starting the first hydraulic cylinder 305, it can be telescoped, thereby driving the first support arm 302 to rotate relative to the first support seat 301 through the first hinge 303. When the first support arm 302 rotates downwards, the support is completed, and when the first support arm 302 rotates upwards, the retraction of the rear support 3 is completed. When the first support arm 302 is in a vertical state, start the second hydraulic cylinder 308 to extend it, which can drive the movable frame 309 and the rollers 310 to move downwards until the rollers 310 abut against the box girder and the fixed seat 306 is lifted by 1 - 10 cm, and then the rollers 310 rotate to move along the box girder, thereby driving the rear support 3 and the main beam 2 to move along the box girder.

[0035] In a further embodiment, as Figure 11 shown, the middle support 4 includes a second support seat 401 fixed to the main beam 2. The second support seat 401 is hinged to a second support arm 402 through a second hinge 403. The second hinge 403 adopts an existing hinge structure. Second connection frames 404 are provided on the sides of both the second support seat 401 and the second support arm 402. The second connection frames 404 of the second support seat 401 and the second support arm 402 are connected by a third hydraulic cylinder 405. The connection modes at both ends of the third hydraulic cylinder 405 are hinge connections. The third hydraulic cylinder 405 is a common hydraulic cylinder used in existing bridge erection machines, and the hydraulic system is connected, controlled, and connected in an existing manner. A fixed column 406 is provided at the bottom of the second support arm 402.

[0036] When in use, the third hydraulic cylinder 405 can be activated to expand and contract, thereby driving the second support arm 402 to rotate relative to the second support base 401 through the second hinge 403. When the second support arm 402 rotates downward, the support is completed, and when the second support arm 402 rotates upward, the middle support 4 is retracted; the operation is simple and it can meet different fixed use requirements.

[0037] In a further preferred embodiment, the support frame is the support 6, and the support 6 is fixedly connected to the side surface of the bridge pier 101; when in use, the support 6 is fixed to the side surface of the bridge pier 101 by welding, or fixed to the side surface of the bridge pier 101 by a hoop.

[0038] The front support 5 includes a connection seat 501, and the top of the connection seat 501 is slidably connected to the main beam 2 through a leg pulley 502; the leg pulley 502 is a leg pulley mechanism commonly used in existing bridge erection machines for the legs to move along the main beam of the bridge erection machine. The way it slides along the main beam and the control method both adopt existing technologies, so they will not be elaborated here. The bottom of the connection seat 501 is provided with a leg 503, and the leg 503 is arranged on the top of the support 6.

[0039] When in use, the front support 5 directly supports on the top of the support 6, and the support 6 is located on the side surface of the bridge pier 101, so that the leg 503 does not need to support on the bridge pier 101, thus not affecting the installation of the box girder and being able to meet the cantilever welding requirements of the box girder.

[0040] Embodiment 3: As Figure 13 and 14 shown, the front support 5 includes a connection seat 501, and the top of the connection seat 501 is slidably connected to the main beam 2 through a leg pulley 502; the connection seat 501 is hinged with a support leg 504 through a third hinge 505; the third hinge 505 adopts an existing hinge structure; a fourth hydraulic cylinder 506 is provided on the side surfaces of the support leg 504 and the connection seat 501, and both ends of the fourth hydraulic cylinder 506 are hinged with the support leg 504 and the connection seat 501 respectively; the fourth hydraulic cylinder 506 is a commonly used hydraulic cylinder in existing bridge erection machines and is connected, controlled and connected to the hydraulic system in an existing manner; When in use, the fourth hydraulic cylinder 506 is activated to expand and contract, thereby driving the support leg 504 to rotate relative to the connection seat 501 through the third hinge 505. When the support leg 504 rotates downward, the support is completed, and when the support leg 504 rotates upward, the front support 5 is retracted; Furthermore, a support frame is provided at the bottom of the support leg 504; the support frame includes a support plate 507 fixed to the bottom of the support leg 504; two side plates 508 are provided at the bottom of the support plate 507, and the side plates 508 are preferably triangular plates and are connected by welding; a connecting sleeve 509 is provided on the side of the support plate 507 and the side plates 508 close to the bridge pier 101; a groove 510 is provided on the side of the connecting sleeve 509 away from the side plate 508, and the groove 510 is a circular groove, and the groove 510 is preferably adapted to the bridge pier 101; a plurality of fixing buckles 511 are hinged to the side of the connecting sleeve 509 away from the side plate 508 through a hinge block 512; the side of the fixing buckle 511 close to the bridge pier 101 is an arc concave surface, and the arc concave surface abuts against the outer peripheral surface of the bridge pier 101; a fixing block 513 is provided on the side surface of the side plate 508, and a fifth hydraulic cylinder 514 is provided between the fixing block 513 and the fixing buckle 511; the fifth hydraulic cylinder 514 is a commonly used hydraulic cylinder for existing bridge erecting machines and is connected, controlled and connected to the hydraulic system in an existing manner; one end of the fifth hydraulic cylinder 514 is hinged to the fixing block 513, and the other end is hinged to the fixing buckle 511.

[0041] During support, the fourth hydraulic cylinder 506 extends to drive the support leg 504 to be vertical, drives the connecting sleeve 509 to closely adhere to the bridge pier 101, and then controls the fifth hydraulic cylinder 514 to extend, driving the arc concave surface of the fixing buckle 511 to approach the bridge pier 101, and the connection can be completed, thereby completing the support of the front support 5; during the use process, there is no need to temporarily set up a support, while ensuring the side support, the construction efficiency is ensured.

[0042] When there is no need for support or when going to the next bridge pier 101 for support, first contract the fifth hydraulic cylinder 514 and then contract the fourth hydraulic cylinder 506 to complete the retraction of the front support 5.

[0043] In another preferred embodiment, the connection between the bottom of the support leg 504 and the support plate 507 is connected by a hinge manner. Thus, after support, the support plate 507, the connecting sleeve 509, the side plates 508 and the fixing buckles 511 as a whole will generate a force rotating relative to the bridge pier 101, thereby acting on the bridge pier 101 a shear force, and further preventing the support frame from sliding down, ensuring the stability after the front support 5 is supported.

[0044] The term "urban reconstruction and expansion" in this application indicates that this application is mainly used for urban reconstruction and expansion projects, but is not limited to urban reconstruction and expansion, so it cannot be interpreted as a limitation to this application.

[0045] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations to the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims as the protection scope. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A method for quickly erecting beam bridges in urban reconstruction and expansion projects, which is characterized by: The steps include: S1. The beam transport vehicle transports the beam to the head of the bridge erecting machine; S2, the overhead crane moves to the front, and the rear support is folded upward, and the beam transport vehicle carries the beams into the vehicle; S3, the beam transport vehicle enters completely and the rear support returns to the supporting state; S4, the middle support is folded upwards, and the overhead crane lifts the box beam; S5, the overhead crane moves the box girder into position, lowers the box girder, and fixes the box girder; Release the connection between the overhead crane and the box girder; S6, the middle support is lowered to support the beam surface, the rear support is folded upward, and the beam transport vehicle is moved out; S7, the bridge erecting machine moves to the next erection position; S8. Repeat S1-S7 until all box girders are erected.

2. According to the method for quickly erecting a beam bridge in an urban reconstruction and expansion project of claim 1, it is characterized by: S7 includes the following steps: S71, the rear support is rotated to a vertical state, the trolley at the bottom of the rear support is lowered, and the middle support is folded; S72, the trolley at the bottom of the rear support works to drive the bridge erection machine to move the middle support closer to the front support; S73, the middle branch resumes support, and the front branch retracts; S74. Move the front support to the next pier position, set up the support frame, and complete the front support.

3. The rapid erection method for beam bridges in urban reconstruction and expansion projects according to claim 2 is characterized by: The support frame is set on the side of the pier, and the bottom of the front support is placed on the top of the support frame; The support frame is located on the side of the pier away from the installed box girder.

4. The rapid erection method for beam bridges in urban reconstruction and expansion projects according to claim 2 is characterized in that: In S74, the support frame is directly connected to the front support, and the connection process includes the following steps: S741, the front branch turns up; S742, the front support moves along the main beam of the bridge erecting machine to the expected position; S743, the front support is rotated downward, and the bottom of the front support is connected to the bridge pier through the support frame to complete the fixing of the front support; The front support is far away from the bridge pier.

5. The rapid erection method of beam bridges for urban reconstruction and expansion projects according to claim 4 is characterized by: The distance between the front support and the pier shall not be less than the length of the box girder extending beyond the pier.

6. Rapid erection equipment for beam bridges in urban reconstruction and expansion projects, characterized by: It comprises a main beam (2), a plurality of overhead cranes (201) are arranged on the top of the main beam (2), and the overhead cranes (201) are slidably connected to the main beam (2); the overhead cranes (201) are used to lift the box beam (102); A rear support (3), a middle support (4) and a front support (5) are provided below the main beam (2); The rear support (3) and the middle support (4) are rotatably connected to the main beam (2); The front support (5) is connected to the bridge pier (101) via a support frame.

7. The rapid erection equipment for beam bridges in urban reconstruction and expansion projects according to claim 6 is characterized by: The rear support (3) comprises a first support seat (301) fixed to the main beam (2), and the first support seat (301) is hingedly connected to the first support arm (302) via a first hinge (303); A first connecting frame (304) is provided on the side of the first supporting seat (301) and the first supporting arm (302); The first support seat (301) and the first connecting frame (304) of the first support arm (302) are connected via a first hydraulic cylinder (305), and the connection mode of the two ends of the first hydraulic cylinder (305) is hinged; A fixing seat (306) is provided at the bottom of the first supporting arm (302), and a fixing plate (307) is provided on the side of the fixing seat (306); The fixed plate (307) is provided with a plurality of second hydraulic cylinders (308), the output ends of the second hydraulic cylinders (308) are provided with movable frames (309), and the bottom of the movable frames (309) is provided with rollers (310).

8. According to the urban reconstruction and expansion project beam bridge rapid erection equipment of claim 6, its characteristics are: The support (4) comprises a second support seat (401) fixed to the main beam (2), and the second support seat (401) is hingedly connected to the second support arm (402) via a second hinged member (403); Second connecting frames (404) are provided on the sides of the second supporting seat (401) and the second supporting arm (402); The second support seat (401) and the second connecting frame (404) of the second support arm (402) are connected via a third hydraulic cylinder (405), and the connection mode of the two ends of the third hydraulic cylinder (405) is hinged; A fixing column (406) is provided at the bottom of the second supporting arm (402).

9. The rapid erection equipment for beam bridges in urban reconstruction and expansion projects according to any one of claims 6 to 8, characterized in that: The support frame is a bracket (6), and the bracket (6) is fixedly connected to the side of the pier (101); The front support (5) comprises a connecting seat (501), and the top of the connecting seat (501) is slidably connected to the main beam (2) via a leg pulley (502); A supporting leg (503) is provided at the bottom of the connecting seat (501), and the supporting leg (503) is arranged on the top of the bracket (6).

10. The rapid erection equipment for beam bridges in urban reconstruction and expansion projects according to any one of claims 6 to 8, characterized in that: The front support (5) comprises a connecting seat (501), and the top of the connecting seat (501) is slidably connected to the main beam (2) via a leg pulley (502); The connecting seat (501) is hingedly connected to a supporting leg (504) via a third hinged member (505); A fourth hydraulic cylinder (506) is provided on the side of the supporting leg (504) and the connecting seat (501), and two ends of the fourth hydraulic cylinder (506) are respectively hinged to the supporting leg (504) and the connecting seat (501); A support frame is provided at the bottom of the support leg (504); the support frame comprises a support plate (507) fixed to the bottom of the support leg (504); Two side plates (508) are provided at the bottom of the support plate (507), and a connecting sleeve (509) is provided on one side of the support plate (507) and the side plate (508) close to the bridge pier (101); A groove (510) is provided on a side of the connecting sleeve (509) away from the side plate (508); A side of the connecting sleeve (509) away from the side plate (508) is hingedly connected to a plurality of fixing buckles (511) via a hinge block (512); One side of the fixing buckle (511) is concave in an arc, and the concave surface of the arc abuts against the outer peripheral surface of the bridge pier (101); A fixing block (513) is provided on the side of the side plate (508), and a fifth hydraulic cylinder (514) is provided between the fixing block (513) and the fixing buckle (511); One end of the fifth hydraulic cylinder (514) is hinged to the fixing block (513), and the other end is hinged to the fixing buckle (511).

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