Steel-concrete composite beam jacking and falling hydraulic system and method

Abstract

The invention discloses a steel-concrete composite beam jacking and falling hydraulic system and method, and belongs to the technical field of highway bridge steel-concrete composite beam jacking and falling. The steel-concrete composite beam jacking and falling hydraulic system comprises a beam body and further comprises a temporary supporting module, the beam body is located above the temporary supporting module, and a hydraulic jacking and falling module, a digital control module and a sensing module are arranged between the beam body and the temporary supporting module. In order to solve the problems that unrecoverable damage is easily caused to a steel box girder body in the falling process after the steel box girder body is welded through manual operation, the overall quality of bridge deck pavement is poor, and the standard requirements cannot be met, after the steel box girder body is spliced and welded, a temporary supporting module is disassembled, and the bridge deck pavement quality is improved. And the hydraulic jacking and falling module, the digital control module and the sensing module are mounted on the pier, and finally, a worker controls the hydraulic cylinder to lift and fall back the beam body for concrete construction, so that the construction efficiency of the highway bridge is improved, and the construction quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of lifting and lowering steel-concrete composite beams for highway bridges, and in particular to a hydraulic system and method for lifting and lowering steel-concrete composite beams. Background Art

[0002] All highway construction projects across the country have very high requirements for product quality. As the market gradually cools down and construction costs increase, if the quality of the products cannot be guaranteed, the reputation loss and maintenance rework losses will be huge; the digital hydraulic steel-concrete composite beam lifting and lowering system has the advantages of short construction cycle, low labor cost, easy control of precision and guaranteed construction quality. The hydraulic lifting and lowering system has been widely used in beam and slab prefabrication, formwork climbing and other fields. Experience has proved that the digital hydraulic lifting and lowering system can well guarantee product quality and production speed.

[0003] At present, the technical measures commonly adopted in the market for adjusting short-tube welding and hydraulic jacks are all manual installation, lifting and lowering. It is difficult for manual workers to accurately adjust the stroke height of each hydraulic jack during the lifting process, and it is difficult to meet the requirements of the design drawings and specifications for the installation and welding accuracy of the beam body. After the main beam is installed and welded, it will not be able to accurately and synchronously fall back during the lowering process. Only a step-by-step adjustment method can be adopted, which can easily lead to uneven force at the fulcrum, and the overall line shape and elevation cannot be accurately controlled. At the same time, if the construction accuracy of the fulcrum cannot be improved, it will lead to welding parts of each box chamber. During the jacking and falling process, it is subjected to sudden loads. During the concrete construction process, the deadweight gradually increases and the stress changes unevenly, which can easily lead to damage to the welding parts. If it is not discovered in time, it will cause great safety hazards to the main structure. In addition, when constructing steel-concrete beam concrete structures, bridge decks at positive and negative bending moments, prefabricated bridge decks, cast-in-place bridge decks, cast-in-place sections on pier tops, and bridge deck wet joints all need to be constructed step by step according to the process and gradually dropped back to connect into a whole. In this case, it is necessary to control the thickness and elevation of each section of the bridge deck, and to ensure that each concrete segment can be smoothly connected as a whole after falling back.

[0004] The manual operation methods currently available on the market are difficult to operate, inefficient, highly risky, and have poor precision control. They are prone to causing irreversible damage to the beam body during the fallback process after the welding of the steel box beam is completed. It is very easy for the elevation, thickness, and flatness to not be met at the same time. Manual operation can easily lead to poor overall quality of the bridge deck pavement and failure to meet regulatory requirements. Therefore, existing needs are not met. In this regard, the present application proposes a hydraulic system and method for lifting and lowering a steel-concrete composite beam. Summary of the invention

[0005] The purpose of the present invention is to provide a hydraulic system and method for lifting and lowering a steel-concrete composite beam. A temporary support module is first built, and a hydraulic lifting and lowering module, a digital control module and a sensor module are installed on the temporary support module. The beam body is arranged above the hydraulic lifting and lowering module. After the beam body is assembled and welded, the temporary support module is removed, and the hydraulic lifting and lowering module, the digital control module and the sensor module are installed on the pier. Finally, personnel control the hydraulic cylinder to lift and lower the beam body for concrete construction, thereby improving the construction efficiency of highway bridges and solving the problems in the prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a hydraulic system for lifting and lowering a steel-concrete composite beam, comprising a beam body and a temporary support module, wherein the beam body is located above the temporary support module, and a hydraulic lifting and lowering module, a digital control module and a sensor module are arranged between the beam body and the temporary support module, wherein the temporary support module comprises a distribution beam, a column, a supporting steel plate and a capping steel plate, wherein the hydraulic lifting and lowering module comprises a hydraulic pump station, a hydraulic cylinder and a hydraulic oil pipe, wherein the digital control module comprises a control center and a data reaction circuit, and wherein the sensor module comprises a pressure sensor and a displacement sensor.

[0007] Preferably, the hydraulic cylinder is located below the beam body, one end of the hydraulic cylinder is connected to the beam body, the other end of the hydraulic cylinder is connected to the supporting steel plate, and the hydraulic cylinder is connected to the hydraulic pump station through a hydraulic oil pipe.

[0008] Preferably, the control center is connected to the hydraulic pump station via a data reaction line, the control center is connected to the pressure sensor via a data reaction line, and the control center is connected to the displacement sensor via a data reaction line.

[0009] Preferably, the pressure sensor and the displacement sensor are both located on one side of the hydraulic cylinder, the pressure sensor is connected to the hydraulic cylinder, and the displacement sensor is fixed under the beam body.

[0010] Preferably, the distribution beam is a double I-beam, the column is a steel pipe structure, the two columns are connected by a tie bar, the supporting steel plate and the capping steel plate are respectively located above and below the distribution beam, and the capping steel plate is located at the upper end of the column.

[0011] A method for lifting and lowering a steel-concrete composite beam is implemented based on a steel-concrete composite beam lifting and lowering hydraulic system, and includes the following steps:

[0012] S1. Level and compact the construction site, and level and compact the access road to the construction site and the assembly site of the temporary support modules;

[0013] S2, installing the support module;

[0014] S3, first install the operation panel of the digital control module on the support module, then debug the digital control module and the hydraulic lifting and falling module to normal operation, and finally install the hydraulic lifting and falling module, the digital control module and the sensor module;

[0015] S4. Adjust the top surface of each hydraulic cylinder to the designed elevation, and adjust the top surface height of each hydraulic cylinder again according to the actual elevation of the beam assembly and welding stage until the beam reaches the designed elevation;

[0016] S5. After the beam assembly and welding is completed, install the hydraulic lifting and lowering module, digital control module and sensor module on the top of the piers except the side piers, install the anchor locking device at the side piers, and remove the temporary support module;

[0017] S6. Carry out the second stage of jacking and lowering operation of the steel-concrete composite beam.

[0018] Preferably, the method for removing the temporary support module in S5 comprises the following steps:

[0019] S501, after supporting the beam body with a jack, flame cut the adjustment short tube in the temporary support module in small amounts and multiple times until the adjustment short tube is separated from the beam, with a maximum cutting amount of 10 mm each time;

[0020] S502. Repeat step S501 until all temporary support modules are removed, and check the beam line shape and elevation.

[0021] Preferably, the second stage jacking and lowering operation of the steel-concrete composite beam in S6 includes the following steps:

[0022] S601. After the beams on the side piers are anchored and locked, the top surfaces of the hydraulic cylinders on the middle piers and sub-middle piers are synchronously raised to a height of h1 according to the design requirements;

[0023] S602, anchor and lock the beam on the secondary middle pier, and synchronously raise the top surface of the hydraulic cylinder on the middle pier again to a height of h2;

[0024] S603, construct the middle span and middle side span positive moment bridge deck, and construct wet joint concrete. After the curing is completed, start the construction of the middle pier negative moment section bridge deck;

[0025] S604, construct the secondary pier support base slab concrete and the side pier diaphragm concrete;

[0026] S605. When the concrete strength reaches the standard, the top surface of the hydraulic cylinder on the middle pier is synchronously lowered and dropped back, and the drop height is h3, h3 = h1 + h2, and the side span positive bending moment bridge deck concrete and the side pier top bridge deck are poured;

[0027] S606, construct the positive bending moment bridge deck on both sides of the secondary pier support, and construct the concrete at the top of the secondary pier after the strength reaches the standard;

[0028] S607, pouring the bottom slab concrete at the middle pier support point. After the concrete strength reaches the standard, the top surface of the hydraulic cylinder on the secondary middle pier is synchronously lowered and dropped back, and the drop height is h1;

[0029] S608, pouring the remaining bottom slab concrete and support diaphragm concrete;

[0030] S609. Remove the hydraulic lifting and lowering modules, digital control modules and sensor modules installed on the top of all bridge piers, and carry out bridge deck paving and ancillary construction.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention first builds a temporary support module, and installs a hydraulic jacking and returning module, a digital control module and a sensor module on the temporary support module. The beam body is arranged above the hydraulic cylinder in the hydraulic jacking and returning module. The top surface of each hydraulic cylinder is located at the design elevation. During the process of assembling and welding the beam body, it is necessary to adjust the top surface height of each hydraulic cylinder again until the beam body reaches the design elevation. After the assembly and welding of the beam body is completed, the temporary support module is removed, and the hydraulic jacking and returning module, the digital control module and the sensor module are installed on the pier. Finally, personnel control the hydraulic cylinder on the pier to lift and return the beam body for concrete construction. Compared with the traditional method of manually controlling the jack to adjust the height of the beam body, the height error is reduced and the construction quality of the highway bridge is improved.

[0033] 2. The present invention installs hydraulic lifting and lowering modules, digital control modules and sensor modules on the tops of the piers except the side piers, supports the beams with jacks, and then removes the temporary support modules, thereby ensuring the accuracy of subsequent construction. After the personnel anchor and lock the beams on the side piers, they first control the hydraulic cylinders on the middle pier and the secondary middle pier to lift them up, then anchor and lock the beams on the secondary middle piers, control the hydraulic cylinders on the middle pier to lift them up, and then carry out the middle span, middle side span positive moment bridge deck, wet joint concrete, middle pier negative moment section in sequence. During the construction of the bridge deck, the bottom slab concrete of the secondary middle pier support and the side pier partition concrete, when the concrete strength reaches the standard, the top of the hydraulic cylinder on the middle pier will come out and fall, and then the positive bending moment bridge deck concrete of the side span and the bridge deck on the top of the side pier, the positive bending moment bridge deck on both sides of the secondary middle pier support, the concrete at the top of the secondary middle pier, and the bottom slab concrete at the middle pier support will be constructed in turn. Finally, the top of the hydraulic cylinder on the secondary middle pier will come out and fall, and the remaining bottom slab concrete and support partition concrete will be poured, thus solving the disadvantages caused by manual height adjustment and improving the overall quality of subsequent bridge deck paving. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is an overall schematic diagram of the present invention;

[0035] Figure 2 It is a schematic diagram of the local structure of the temporary support module of the present invention;

[0036] Figure 3 It is a partial structural schematic diagram of the digital control module of the present invention;

[0037] Figure 4 It is a schematic diagram of the beam body concrete construction of the present invention.

[0038] In the figure: 1. Beam body; 2. Temporary support module; 201. Distribution beam; 202. Column; 203. Support steel plate; 204. Capping steel plate; 3. Hydraulic lifting and lowering module; 301. Hydraulic pump station; 302. Hydraulic cylinder; 303. Hydraulic oil pipe; 4. Digital control module; 401. Control center; 402. Data response circuit; 5. Sensor module; 501. Pressure sensor; 502. Displacement sensor. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In order to solve the problem that manual operation can easily cause irreversible damage to the beam body during the fall back process after the steel box beam body is welded, resulting in poor overall quality of the bridge deck pavement and failure to meet the requirements of the specification, please refer to Figure 1-4 , this embodiment provides the following technical solutions:

[0041] A steel-concrete composite beam lifting and lowering hydraulic system comprises a beam body 1 and a temporary support module 2. The beam body 1 is located above the temporary support module 2. A hydraulic lifting and lowering module 3, a digital control module 4 and a sensor module 5 are arranged between the beam body 1 and the temporary support module 2. The temporary support module 2 comprises a distribution beam 201, a column 202, a support steel plate 203 and a capping steel plate 204. The hydraulic lifting and lowering module 3 comprises a hydraulic pump station 301, a hydraulic cylinder 302 and a hydraulic oil pipe 303. The digital control module 4 comprises a control center 401 and a data reaction circuit 402. The sensor module 5 comprises a pressure sensor 501 and a displacement sensor 502.

[0042] The hydraulic cylinder 302 is located below the beam body 1, one end of the hydraulic cylinder 302 is connected to the beam body 1, the other end of the hydraulic cylinder 302 is connected to the supporting steel plate 203, the hydraulic cylinder 302 is connected to the hydraulic pump station 301 through the hydraulic oil pipe 303, the control center 401 is connected to the hydraulic pump station 301 through the data reaction line 402, the control center 401 is connected to the pressure sensor 501 through the data reaction line 402, and the control center 401 is connected to the displacement sensor 502 through the data reaction line 402 is connected, the pressure sensor 501 and the displacement sensor 502 are both located on one side of the hydraulic cylinder 302, the pressure sensor 501 is connected to the hydraulic cylinder 302, the displacement sensor 502 is fixed under the beam body 1, the distribution beam 201 is a double-piece I-beam, the column 202 is a steel pipe structure, the two columns 202 are connected by a tie bar, the supporting steel plate 203 and the capping steel plate 204 are respectively located above and below the distribution beam 201, and the capping steel plate 204 is located at the upper end of the column 202.

[0043] A temporary support module 2 is first constructed, and a hydraulic lifting and lowering module 3, a digital control module 4 and a sensor module 5 are installed on the temporary support module 2. The beam body 1 is arranged above the hydraulic cylinder 302 in the hydraulic lifting and lowering module. The top surface of each hydraulic cylinder 302 is located at the designed elevation. During the assembly and welding of the beam body 1, it is necessary to adjust the top surface height of each hydraulic cylinder 302 again until the beam body 1 reaches the designed elevation. When the assembly and welding of the beam body 1 is completed, the hydraulic lifting and lowering module 3, the digital control module 4 and the sensor module 5 are installed on the top of the pier except the side pier, and the beam body 1 is supported by a jack, and then the temporary support module 2 is removed. Finally, personnel control the hydraulic cylinder 302 on the pier to lift and lower the beam body 1 for concrete construction. Compared with the traditional method of manually controlling the jack to adjust the height of the beam body 1, the height error is reduced, and irreversible damage to the beam body 1 during the lowering process is avoided, thereby further improving the construction quality of highway bridges.

[0044] A method for lifting and lowering a steel-concrete composite beam is implemented based on a steel-concrete composite beam lifting and lowering hydraulic system, and includes the following steps:

[0045] S1. Level and compact the construction site, level and compact the access road to the construction site and the assembly site of the temporary support module 2 to ensure the normal operation of the construction vehicles;

[0046] S2, install the support module 2, the size of the column 202 is Φ273×8 steel pipe, the tie bar uses L100×8 equilateral angle steel, the distribution beam 201 uses double-jointed 40a I-beam, and the adjustment short column uses 150*100*8 square tube;

[0047] S3, first install the operation panel of the digital control module 4 on the support module 2, then debug the digital control module 4 to normal operation, verify the output and input of the data reaction circuit 402, debug the hydraulic lifting and falling module 3 to normal operation, check the operation of the hydraulic pump station 301 to ensure smooth operation after loading, and finally install the hydraulic lifting and falling module 3, the digital control module 4 and the sensor module 5, wherein the hydraulic cylinder 302 and the distribution beam 201 are installed and fixed, and the hydraulic oil pipe 303 and the hydraulic pump station 301 are connected, and the hydraulic pump station 301 is operated again to ensure that there is no leakage of pump fluid. In addition, the pressure sensor 501 is connected to the control center 401 through the data reaction circuit 402, and the operation parameters are ensured to ensure normal data transmission. After the displacement sensor 502 is connected to the control center 401 through the data reaction circuit 402 and operates normally, the displacement sensor 502 is fixedly connected to the bottom plate of the beam body 1 to ensure quick data response;

[0048] S4. The personnel input each design elevation to the control center 401, so that the top surface of each hydraulic cylinder 302 is at the design elevation. According to the actual elevation of the beam body 1 during the assembly and welding stage, the top surface height of each hydraulic cylinder 302 is adjusted again until the beam body 1 reaches the design elevation. In the process of installing the beam body 1, the displacement change parameters generated during the installation of the beam body 1 are fed back to the control center 401 through the displacement sensor 502. After installing a whole segment, the control center 401 compares the design bottom elevation parameters, analyzes the deviation value, and then calculates and feeds back the adjustment value, which is transmitted to the pressure sensor 501. The pressure sensor 501 then feeds back the correction parameter to the hydraulic pump station 301. At this point, the hydraulic pump station 301 starts to work, and adjusts the elevation of the beam body 1 through the hydraulic cylinder 302, thereby completing the automatic adjustment of the elevation of the bottom plate segment of the beam body 1 installation, and continues to automatically adjust the web, partition and top plate during the installation process according to the above operation to achieve the purpose of high-precision installation;

[0049] S5. After the assembly and welding of the beam body 1 is completed and the segments of the beam body 1 are connected into a whole, first install the hydraulic lifting and lowering module 3, the digital control module 4 and the sensor module 5 on the top of the piers except the side piers, then install the anchor locking device at the side piers, and finally remove the temporary support module 2. Before removal, it is necessary to use a jack to support the beam body 1 near the adjustment short tube, and then flame cut the adjustment short tube on the temporary support module 2 with a cutting amount of 10mm. Then loosen the jack, observe the separation of the adjustment short tube from the beam body 1, continue to cut the adjustment short tube until the adjustment short tube is completely separated from the steel beam, and finally repeat the above steps until all temporary support modules 2 are removed, and check the linearity and elevation of the beam body 1.

[0050] S6. Carry out the second stage of jacking and lowering operation of the steel-concrete composite beam.

[0051] Specifically, the second stage jacking and lowering operation of the steel-concrete composite beam in S6 includes the following steps:

[0052] S601, after the beam body 1 on the side pier is anchored and locked, the top surfaces of the hydraulic cylinders 302 on the middle pier and the secondary middle pier are synchronously raised to a height of h1 according to the design requirements;

[0053] S602, anchor and lock the beam body 1 on the secondary middle pier, and synchronously lift the top surface of the hydraulic cylinder 302 on the middle pier again to a height of h2;

[0054] S603, construct the middle span and middle side span positive moment bridge deck, and construct wet joint concrete. After the curing is completed, start the construction of the middle pier negative moment section bridge deck;

[0055] S604, construct the secondary pier support base slab concrete and the side pier diaphragm concrete;

[0056] S605, when the concrete strength reaches the standard, the top surface of the hydraulic cylinder 302 on the middle pier is synchronously lowered and dropped back, the drop height is h3, h3 = h1 + h2, and the side span positive bending moment bridge deck concrete and the side pier top bridge deck are poured;

[0057] S606, construct the positive bending moment bridge deck on both sides of the secondary pier support, and construct the concrete at the top of the secondary pier after the strength reaches the standard;

[0058] S607, pouring the bottom slab concrete at the middle pier support point, after the concrete strength reaches the standard, the top surface of the hydraulic cylinder 302 on the secondary middle pier is synchronously lowered and dropped back, and the drop height is h1;

[0059] S608, pouring the remaining bottom slab concrete and support diaphragm concrete;

[0060] S609. Remove the hydraulic lifting and lowering modules 3, digital control modules 4 and sensor modules 5 installed on the top of all bridge piers, and carry out bridge deck paving and ancillary construction.

[0061] Working principle: First, a temporary support module 2 is built, and a hydraulic lifting and lowering module 3, a digital control module 4 and a sensor module 5 are installed on the temporary support module 2. The beam body 1 is arranged above the hydraulic cylinder 302 of the hydraulic lifting and lowering module 3. After the assembly and welding of the beam body 1 are completed, the temporary support module 2 is removed, and the hydraulic lifting and lowering module 3, the digital control module 4 and the sensor module 5 are installed on the pier. Finally, personnel control the hydraulic cylinder 302 to lift and lower the beam body 1 for concrete construction, which improves the construction efficiency of highway bridges and ensures the construction quality.

[0062] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0063] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic system for lifting and lowering a steel-concrete composite beam, comprising a beam body (1), characterized in that: The invention also comprises a temporary support module (2), wherein the beam body (1) is located above the temporary support module (2), and a hydraulic lifting and lowering module (3), a digital control module (4) and a sensor module (5) are arranged between the beam body (1) and the temporary support module (2), wherein the temporary support module (2) comprises a distribution beam (201), a column (202), a support steel plate (203) and a capping steel plate (204), wherein the hydraulic lifting and lowering module (3) comprises a hydraulic pump station (301), a hydraulic cylinder (302) and a hydraulic oil pipe (303), wherein the digital control module (4) comprises a control center (401) and a data reaction circuit (402), and wherein the sensor module (5) comprises a pressure sensor (501) and a displacement sensor (502).

2. A hydraulic system for lifting and lowering a steel-concrete composite beam according to claim 1, characterized in that: The hydraulic cylinder (302) is located below the beam body (1), one end of the hydraulic cylinder (302) is connected to the beam body (1), the other end of the hydraulic cylinder (302) is connected to the supporting steel plate (203), and the hydraulic cylinder (302) is connected to the hydraulic pump station (301) via a hydraulic oil pipe (303).

3. The hydraulic system for lifting and lowering a steel-concrete composite beam according to claim 1 is characterized in that: The control center (401) is connected to the hydraulic pump station (301) via a data reaction line (402), the control center (401) is connected to the pressure sensor (501) via a data reaction line (402), and the control center (401) is connected to the displacement sensor (502) via a data reaction line (402).

4. The hydraulic system for lifting and lowering a steel-concrete composite beam according to claim 1 is characterized in that: The pressure sensor (501) and the displacement sensor (502) are both located on one side of the hydraulic cylinder (302); the pressure sensor (501) is connected to the hydraulic cylinder (302); and the displacement sensor (502) is fixed below the beam body (1).

5. The hydraulic system for lifting and lowering a steel-concrete composite beam according to claim 1 is characterized in that: The distribution beam (201) is a double-jointed I-beam, the column (202) is a steel pipe structure, the two columns (202) are connected by a tie bar, the supporting steel plate (203) and the capping steel plate (204) are respectively located above and below the distribution beam (201), and the capping steel plate (204) is located at the upper end of the column (202).

6. A method for lifting and lowering a steel-concrete composite beam, implemented based on a hydraulic system for lifting and lowering a steel-concrete composite beam according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, leveling and compacting the construction site, leveling and compacting the access road to the construction site and the assembly site of the temporary support module (2); S2, installing the support module (2); S3, first install the operation panel of the digital control module (4) on the support module (2), then debug the digital control module (4) and the hydraulic lifting and falling module (3) to a normal operating state, and finally install the hydraulic lifting and falling module (3), the digital control module (4) and the sensor module (5); S4, adjusting the ejection surface of each hydraulic cylinder (302) to the designed elevation, and adjusting the ejection surface height of each hydraulic cylinder (302) again according to the actual elevation of the beam body (1) during the assembly and welding stage, until the beam body (1) reaches the designed elevation; S5. After the beam body (1) is assembled and welded, a hydraulic lifting and lowering module (3), a digital control module (4) and a sensor module (5) are installed on the top of the piers except the side piers, an anchor locking device is installed at the side piers, and the temporary support module (2) is removed; S6. Carry out the second stage of jacking and lowering operation of the steel-concrete composite beam.

7. The method for lifting and lowering a steel-concrete composite beam according to claim 6, characterized in that: The method for removing the temporary support module (2) in S5 comprises the following steps: S501, after supporting the beam body (1) with a jack, flame cut the adjustment short tube in the temporary support module (2) in small amounts and multiple times until the adjustment short tube is separated from the beam body (1), and the maximum cutting amount each time is 10 mm; S502, repeat step S501 until all temporary support modules (2) are removed, and check the line shape and elevation of the beam body (1).

8. The method for lifting and lowering a steel-concrete composite beam according to claim 6, characterized in that: The second stage of lifting and lowering of the steel-concrete composite beam in S6 includes the following steps: S601, after the beam body (1) on the side pier is anchored and locked, the top surfaces of the hydraulic cylinders (302) on the middle pier and the secondary middle pier are synchronously raised to a height of h1 according to the design requirements; S602, anchoring and locking the beam body (1) on the secondary middle pier, and synchronously raising the top surface of the hydraulic cylinder (302) on the middle middle pier again to a height of h2; S603, construct the middle span and middle side span positive moment bridge deck, and construct wet joint concrete. After the curing is completed, start the construction of the middle pier negative moment section bridge deck; S604, construct the secondary pier support base slab concrete and the side pier diaphragm concrete; S605, when the concrete strength reaches the standard, the top surface of the hydraulic cylinder (302) on the middle pier is synchronously lowered and dropped back, the drop height is h3, h3 = h1 + h2, and the side span positive bending moment bridge deck concrete and the side pier top bridge deck are poured; S606, construct the positive bending moment bridge deck on both sides of the secondary pier support, and construct the concrete at the top of the secondary pier after the strength reaches the standard; S607, pouring the bottom slab concrete at the middle pier support point, after the concrete strength reaches the standard, the top surface of the hydraulic cylinder (302) on the secondary middle pier is synchronously lowered and dropped back, and the drop height is h1; S608, pouring the remaining bottom slab concrete and support diaphragm concrete; S609, remove the hydraulic lifting and lowering modules (3), digital control modules (4) and sensor modules (5) installed on the top of all bridge piers, and carry out bridge deck paving and ancillary construction.

Images