Construction method for feeding beam behind large-volume steel box girder of narrow-terrain cable-stayed bridge

Abstract

The application discloses a construction method for feeding beam behind a large-volume steel box girder of a narrow-terrain cable-stayed bridge, and the method comprises the following steps: manufacturing three block assembly welding modules by transversely dividing a standard section, matching the assembly welding modules into the standard section by using temporary matching parts in a pre-assembling field, and then assembling the standard sections into a combined section by using the temporary matching parts; then, the temporary matching parts are removed, the assembly welding modules are transferred to the lower part of an on-bridge gantry crane of a starting section of the bridge by using a beam transporting vehicle, the assembly welding modules are hoisted to the bridge deck height by the on-bridge gantry crane, and the on-bridge gantry crane is used to complete the on-bridge step of the assembly welding modules; then, a movable bed is prepared, the assembly welding modules are hoisted to the movable bed by the on-bridge gantry crane, the three block assembly welding modules are distributed along the bridge, and the three block assembly welding modules are matched into the standard section by using the temporary matching parts on the movable bed; finally, the movable bed is used to transport the standard section to the bridge deck crane for steel box girder assembling construction, so that the feeding beam step is completed. The application has the effect of realizing the purpose of transporting the steel box girder in a narrow passageway.

Description

Technical Field

[0001] The present application relates to the technical field of steel box girder construction, and in particular to a method for rear-feeding a large-volume steel box girder of a cable-stayed bridge in narrow terrain. Background Art

[0002] The construction of the main beam of a cable-stayed bridge often adopts the cantilever assembly method of a bridge crane. During the bridge assembly, it is necessary to continuously transport standard steel box beam segments to the bridge crane. The standard steel box beam segments are first pre-assembled in the pre-assembly yard. After the adjacent standard segments meet the matching requirements, the standard segments are transported one by one to the gantry crane lifting station on the bridge in the order of assembly. The gantry crane lifting station lifts the standard segments to the beam transport vehicle on the bridge, and the beam transport vehicle on the bridge then transports the standard segments to the bridge crane, thus completing the rear beam feeding construction.

[0003] In large-span bridges, the standard segment length of steel box girders reaches 30m and the width is 16m. When constructing large-span bridges in narrow terrain, it is not conducive for beam transport vehicles to carry large-volume steel box girders on the bridge deck, so there is still room for improvement. Summary of the Invention

[0004] In order to achieve the purpose of transporting steel box girders in narrow walkways, the present application provides a rear feeding beam construction method for large-volume steel box girders of cable-stayed bridges in narrow terrain.

[0005] This application provides a method for rear-feeding large steel box girders for narrow-terrain cable-stayed bridges, using the following technical solutions:

[0006] A method for rear feeding beams of large steel box girders for cable-stayed bridges in narrow terrain comprises the following steps:

[0007] S1: Divide the standard segment into three welded modules for fabrication, and use temporary matching parts to align the welded modules into standard segments in the pre-assembly yard. Then, use temporary matching parts to assemble the standard segments into combined segments.

[0008] S2: Remove the temporary matching parts and transfer the welding module to the bottom of the upper bridge gantry crane at the starting section of the bridge by the beam transporter. The upper bridge gantry crane will lift the welding module to the height of the bridge deck to complete the welding module bridge installation step;

[0009] S3: Prepare the mobile jig. The bridge gantry crane hoists the welding modules onto the mobile jig. The three welding modules are distributed along the bridge. On the mobile jig, temporary matching parts are used to match the three welding modules into standard segments.

[0010] S4: The mobile cradle transports the standard segments to the bridge crane for steel box girder assembly, thus completing the beam feeding step.

[0011] By adopting the above technical solution, the standard segment is divided into three sections of welded modules for transportation, which is convenient for the beam transport vehicle to load and unload, thereby facilitating the transportation of the steel box beam in a narrow walkway, and then reassembled on the mobile cradle on the bridge deck. In addition, the mobile cradle has a mobile function and can replace the gantry crane on the bridge to complete the steps of long-distance mobile lifting of the standard segment, which can reduce investment costs and improve beam feeding efficiency.

[0012] Preferably, in said S3, two mobile cradles are prepared for the transportation of standard segments, and a transfer gantry crane is set up. The transfer gantry crane is located between the bridge crane and the upper bridge gantry crane. The transfer gantry crane lifts the empty return mobile cradle to a high place to allow the mobile cradle carrying the standard segments to pass from the bridge deck.

[0013] By adopting the above technical solution, two mobile cradles are set up, which is beneficial to improving the transportation efficiency of standard segments. At the same time, in order to solve the problem of affecting the movement efficiency when the two mobile cradles meet, a transfer gantry crane is added between the bridge crane and the upper bridge gantry crane to lift the empty return mobile cradle to a high place. The mobile cradle carrying standard segments can pass under the empty mobile cradle, and there is no need for the mobile cradle to turn or transfer the standard segments in the middle, so as to improve the smoothness of the beam feeding construction.

[0014] Preferably, the mobile tire frame includes a main frame, a sub-frame, a plurality of rotating shafts, a plurality of rollers and a plurality of first motors, the main frame is used to carry the assembly welding module; the sub-frame is arranged inside the main frame, the plurality of rotating shafts are arranged horizontally and rotatably connected to the sub-frame, the plurality of rollers are coaxially fixed on the periphery of the plurality of rotating shafts, the plurality of first motors respectively drive the plurality of rotating shafts to rotate, and the plurality of rotating shafts are respectively placed at the front and rear ends of the mobile tire frame; in S4, the plurality of first motors respectively drive the corresponding rotating shafts to rotate in the same direction, and the mobile tire frame moves as a whole under the rotation of the rollers.

[0015] By adopting the above technical solution, a rotating shaft, a roller and a first motor are added to the tire frame, thereby facilitating the movement of the tire frame.

[0016] Preferably, the main frame is provided with a telescopic drive component for driving the sub-frame to rise and fall, and a pad is provided in the middle of the upper surface of the main frame, and the pad is used to place the middle welding module; in S3, under the driving action of the telescopic drive component, the sub-frame, the rotating shaft and the roller realize an upward movement relative to the main frame, and when the upper side of the roller protrudes from the upper surface of the main frame, the roller is separated from the bridge deck, and the rollers at the front and rear ends respectively lift the welding modules on both sides to make the upper surfaces of the welding modules on both sides flush with the upper surface of the middle welding module, and then start a number of first motors, and the rollers at the front and rear ends rotate synchronously in opposite directions, and drive the welding modules on both sides to move closer to the middle welding module until the matching surfaces of adjacent welding modules abut against each other.

[0017] By adopting the above technical solution, the roller lifting function is given, and the free switching of the mobile tire frame walking function and the welding module assembly function is realized within the limited space of the tire frame, which is conducive to improving the assembly accuracy and assembly efficiency of the welding module.

[0018] Preferably, mutually facing plywood are respectively provided on both sides of the main frame, and the plywood extends along the length direction of the movable tire frame. The main frame is provided with a driving mechanism, and the driving mechanism drives the two plywood to approach or move away from each other; in S3, the welding module is placed on the main frame, and the welding module is located between the two plywood. The driving mechanism is started, and the driving mechanism drives the two plywood to approach each other until the two plywood simultaneously press against the two side surfaces of several welding modules.

[0019] By adopting the above technical solution, the welding modules can be aligned, which is beneficial to improving the assembly accuracy and assembly efficiency of the welding modules.

[0020] Preferably, mounting seats are provided on both sides of the main frame, and the driving mechanism includes two bidirectional screws, which are arranged horizontally and rotatably connected between the two mounting seats. The two ends of the bidirectional screw are respectively threaded through the two splints, and the mounting seat is provided with a second motor to drive the bidirectional screw to rotate.

[0021] By adopting the above technical solution, it is convenient to center each welding module, and the forces on both sides of the welding module are evenly distributed, which is beneficial to reducing the probability of damage to the welding module.

[0022] Preferably, the telescopic driving member is a jack, which is located above the sub-frame, and the telescopic end of the jack is vertically arranged downward and fixedly connected to the sub-frame.

[0023] By adopting the above technical solution, the stable lifting function of the sub-frame can be achieved.

[0024] Preferably, there are four jacks in total, and the four jacks are respectively located at the four corners of the sub-frame.

[0025] By adopting the above technical solution, the auxiliary frame can be subjected to balanced force. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the state of the beam feeding process in a method for rear beam feeding of a large-volume steel box girder of a cable-stayed bridge in narrow terrain according to an embodiment of the present application.

[0027] Figure 2 This is a schematic diagram of the state of assembling and welding modules through a mobile cradle in a method for rear feeding beams of a large-volume steel box girder of a cable-stayed bridge in narrow terrain according to an embodiment of the present application.

[0028] Figure 3 This is a schematic diagram of the state of assembling and welding modules through a mobile cradle in a method for rear feeding beams of a large-volume steel box girder of a cable-stayed bridge in narrow terrain according to an embodiment of the present application.

[0029] Explanation of the accompanying reference numerals: 1. Standard segment; 11. Assembly welding module; 2. Mobile tire frame; 21. Main frame; 211. Mounting seat; 212. Bidirectional screw; 213. Second motor; 214. Pad; 22. Sub-frame; 23. First motor; 24. Rotating shaft; 25. Roller; 3. Cylinder; 4. Clamp; 5. Upper bridge gantry crane; 6. Transfer gantry crane; 7. Bridge crane; 8. Bridge deck. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-3 This application is described in further detail.

[0031] The present invention discloses a method for constructing a large steel box girder rear feed beam for a narrow terrain cable-stayed bridge. Figure 1 , comprising the following steps:.

[0032] S1: Divide the standard segment 1 into three welding modules 11 for production, and use temporary matching parts to match the welding modules 11 into standard segments 1 in the pre-assembly field, and then use temporary matching parts to assemble the standard segments 1 into a combined segment.

[0033] S2: Remove the temporary matching parts and transfer the welding module 11 to the bottom of the upper bridge gantry crane 5 at the starting section of the bridge by the beam transport vehicle. The upper bridge gantry crane 5 lifts the welding module 11 to the height of the bridge deck 8 to complete the step of placing the welding module 11 on the bridge.

[0034] S3: Prepare two mobile cradles 2 for transporting the standard segment 1, and set up a transfer gantry crane 6 on the bridge deck 8. The transfer gantry crane 6 is located between the bridge deck 8 crane 7 and the upper bridge gantry crane 5.

[0035] In order to improve the assembly accuracy and assembly efficiency of the welding module 11, the mobile tire frame 2 is modified. Specifically, the mobile tire frame 2 includes a main frame 21, a sub-frame 22, a plurality of rotating shafts 24, a plurality of rollers 25 and a plurality of first motors 23. A pad 214 is fixed on the upper surface of the main frame 21, and the pad 214 is used to support the welding module 11 in the middle. The sub-frame 22 is installed inside the main frame 21. Specifically, a telescopic drive component that drives the sub-frame 22 to rise and fall is fixedly installed in the main frame 21. The telescopic drive component is specifically four jacks. The four jacks are all located above the sub-frame 22, and the four jacks are respectively located at the four corners of the sub-frame 22. The telescopic end of the jack is set vertically downward and fixedly connected to the sub-frame 22.

[0036] A plurality of rotating shafts 24 are horizontally disposed and rotatably connected to the inner side of the sub-frame 22. The rotating shafts 24 are located at the front and rear ends of the mobile tire frame 2. A plurality of rollers 25 are coaxially fixed to the outer peripheries of the rotating shafts 24. A plurality of first motors 23 are coaxially fixedly connected to the rotating shafts 24 to rotate the corresponding rotating shafts 24.

[0037] In addition, mutually opposing clamping plates 4 are provided on both sides of the main frame 21, and the clamping plates 4 extend along the length direction of the mobile tire frame 2. Mounting seats 211 are provided on both sides of the main frame 21, and a driving mechanism is provided between the mounting seats 211 on both sides. Specifically, the driving mechanism includes two bidirectional screws 212, which are horizontally arranged and rotatably connected between the two mounting seats 211. The two ends of the bidirectional screws 212 are respectively threaded through the two clamping plates 4. The mounting seats 211 are equipped with a second motor 213 that drives the bidirectional screws 212 to rotate. The output shaft of the second motor 213 is coaxially fixedly connected to the bidirectional screws 212. The function of moving the two clamping plates 4 closer to or farther away from each other is achieved through the synchronous forward and reverse rotation of the two second motors 213.

[0038] During the beam feeding process, the upper bridge gantry crane 5 hoists the assembly welding modules 11 onto the mobile tire frame 2 . The three assembly welding modules 11 are distributed along the bridge direction and are located between the two clamping plates 4 .

[0039] During the assembly process, the jacks retract, and driven by the telescopic drive member, the sub-frame 22, rotating shaft 24, and roller 25 move upward relative to the main frame 21. When the upper side of the roller 25 protrudes from the upper surface of the main frame 21 and is flush with the upper surface of the pad 214, the roller 25 separates from the bridge deck 8. The rollers 25 at the front and rear ends respectively lift the welding modules 11 on both sides to align the upper surfaces of the welding modules 11 on both sides with the upper surface of the middle welding module 11. The first motors 23 are then activated, causing the rollers 25 at the front and rear ends to rotate synchronously in opposite directions, driving the welding modules 11 on both sides toward the middle welding module 11 until the matching surfaces of the adjacent welding modules 11 abut against each other.

[0040] Then, the two second motors 213 are started simultaneously to drive the two clamping plates 4 toward each other until the two clamping plates 4 simultaneously abut against the two side surfaces of the plurality of welding modules 11. This aligns the side surfaces of the welding modules 11, which is beneficial to improving the assembly accuracy and efficiency of the welding modules 11.

[0041] Then, the three welding modules 11 are matched into a standard segment 1 using temporary matching parts.

[0042] S4: The mobile tread 2 transports the standard segment 1 to the bridge deck 8 for crane 7 to assemble the steel box girder. Specifically, the jack is extended. Driven by the jack, the subframe 22, rotating shaft 24, and roller 25 move downward relative to the main frame 21. The lower side of the roller 25 protrudes from the lower surface of the main frame 21. The roller 25 contacts the bridge deck 8 and props up the main frame 21. A plurality of first motors 23 drive the corresponding rotating shafts 24 to rotate in the same direction. The mobile tread 2 moves as a whole under the rotation of the roller 25 to perform the beam feeding step. The jack gives the roller 25 a lifting function. Within the limited space of the tread, the mobile tread 2 can freely switch between its travel function and the assembly function of the welding module 11, which also helps improve the assembly accuracy and efficiency of the welding module 11.

[0043] Because the embodiment of the present application uses two mobile cradles 2 for transportation, transportation efficiency is improved. During transportation, the transfer gantry crane 6 lifts the empty mobile cradle 2 on its return journey to a high position, and the mobile cradle 2 loaded with standard segments 1 can pass under the empty mobile cradle 2, eliminating the need for the mobile cradle 2 to turn or transfer standard segments 1 midway, thereby improving the smoothness of beam feeding construction.

[0044] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for rear-feeding large steel box girders for cable-stayed bridges in narrow terrain, characterized by: The following steps are involved: S1: The standard segment (1) is transversely divided into three welding modules (11) for production, and the welding modules (11) are transversely matched into standard segments (1) using temporary matching parts in a pre-assembly field, and then the standard segments (1) are assembled into a combined segment using temporary matching parts; S2: Remove the temporary matching parts, transfer the assembly welding module (11) to the bottom of the upper bridge gantry crane (5) at the starting section of the bridge by the beam transport vehicle, and the upper bridge gantry crane (5) lifts the assembly welding module (11) to the height of the bridge deck (8) to complete the step of putting the assembly welding module (11) on the bridge; S3: Prepare the mobile tire frame (2), and the upper bridge gantry crane (5) hoists the welding module (11) onto the mobile tire frame (2). The three welding modules (11) are distributed along the bridge direction, and on the mobile tire frame (2), the three welding modules (11) are matched into a standard segment (1) using temporary matching parts; S4: The mobile cradle (2) transports the standard segment (1) to the bridge deck (8) and the crane (7) performs the steel box girder assembly construction, thereby completing the beam feeding step; The mobile tire frame (2) comprises a main frame (21), a sub-frame (22), a plurality of rotating shafts (24), a plurality of rollers (25) and a plurality of first motors (23), wherein the main frame (21) is used to carry the assembly welding module (11); the sub-frame (22) is arranged inside the main frame (21), the plurality of rotating shafts (24) are arranged horizontally and rotatably connected to the sub-frame (22), the plurality of rollers (25) are coaxially fixed on the outer peripheries of the plurality of rotating shafts (24), the plurality of first motors (23) respectively drive the plurality of rotating shafts (24) to rotate, and the plurality of rotating shafts (24) are respectively arranged at the front and rear ends of the mobile tire frame (2); in S4, the plurality of first motors (23) respectively drive the corresponding rotating shafts (24) to rotate in the same direction, and the mobile tire frame (2) moves as a whole under the rotation of the rollers (25); The main frame (21) is provided with a telescopic driving member for driving the sub-frame (22) to rise and fall, and a pad (214) is provided in the middle of the upper surface of the main frame (21), and the pad (214) is used to place the middle welding module (11); in S3, under the driving action of the telescopic driving member, the sub-frame (22), the rotating shaft (24) and the roller (25) realize an upward movement relative to the main frame (21), and when the upper side of the roller (25) protrudes from the upper surface of the main frame (21), the sub-frame (22), the rotating shaft (24) and the roller (25) are moved upward relative to the main frame (21). When the bridge deck (8) is connected to the bridge surface, the rollers (25) are separated from the bridge deck (8), and the rollers (25) at the front and rear ends respectively lift the welding modules (11) on both sides to make the upper surfaces of the welding modules (11) on both sides flush with the upper surface of the middle welding module (11), and then the first motors (23) are started, and the rollers (25) at the front and rear ends rotate synchronously in opposite directions, and drive the welding modules (11) on both sides to move closer to the middle welding module (11) until the matching surfaces of the adjacent welding modules (11) abut against each other.

2. The method for rear feeding of large steel box girders for narrow-terrain cable-stayed bridges according to claim 1 is characterized by: In the above-mentioned S3, two mobile cradles (2) are prepared for transporting the standard segment (1), and a transfer gantry crane (6) is set up. The transfer gantry crane (6) is located between the bridge deck (8) crane (7) and the upper bridge gantry crane (5). The transfer gantry crane (6) lifts the empty return mobile cradle (2) to a high place so that the mobile cradle (2) carrying the standard segment (1) can pass through the bridge deck (8).

3. The method for rear feeding of large steel box girders for narrow-terrain cable-stayed bridges according to claim 1 is characterized by: The main frame (21) is provided with clamping plates (4) facing each other on both sides, and the clamping plates (4) extend along the length direction of the mobile tire frame (2). The main frame (21) is provided with a driving mechanism, and the driving mechanism drives the two clamping plates (4) to move closer to or farther away from each other; in S3, the welding module (11) is placed on the main frame (21), and the welding module (11) is located between the two clamping plates (4). The driving mechanism is started, and the driving mechanism drives the two clamping plates (4) to move closer to each other until the two clamping plates (4) simultaneously abut against the two side surfaces of the plurality of welding modules (11).

4. The method for rear feeding of large steel box girders for narrow-terrain cable-stayed bridges according to claim 3 is characterized by: Mounting seats (211) are provided on both sides of the main frame (21), and the driving mechanism includes two bidirectional screws (212). The bidirectional screws (212) are horizontally arranged and rotatably connected between the two mounting seats (211). Both ends of the bidirectional screws (212) are respectively threaded through the two clamping plates (4). The mounting seats (211) are provided with a second motor (213) for driving the bidirectional screws (212) to rotate.

5. The method for rear feeding of large steel box girders for cable-stayed bridges in narrow terrain according to claim 1 is characterized by: The telescopic driving member is a jack, which is located above the sub-frame (22), and the telescopic end of the jack is vertically arranged downward and fixedly connected to the sub-frame (22).

6. The method for rear feeding of large steel box girders for cable-stayed bridges in narrow terrain according to claim 5 is characterized by: There are four jacks in total, and the four jacks are respectively located at the four corners of the sub-frame (22).

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