Installation process of asymmetric steel-concrete composite beam under complex transportation conditions

Abstract

The application discloses a kind of complex transport conditions asymmetric steel concrete composite beam installation process, comprising: erecting pier side support and sliding support, the sliding support across the complex terrain structure that hinders composite beam transport construction, the sliding support one end extends to the water edge of main pier side, while the other end sets up scattered assembly site and pedestal;Utilize floating crane hoisting composite beam scattered parts, and form the composite beam of main pier top section in main pier top assembly;Pier top section deck is installed using tower crane;A pair of deck cranes is set on the deck of pier top, and the composite beam of side span and midspan is symmetrically installed from the middle of main pier to both sides, and the corresponding deck is installed using beam transport vehicle and automobile crane;In the land part, the composite beam scattered parts are assembled into composite beam in scattered assembly site, then transported to the position of land hoisting beam by sliding support, hoisted and fixed by deck crane;After the hoisting of composite beam is completed, pier side support and sliding support are removed.The application overcomes the adverse effects of complex terrain structure on bridge construction.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bridge construction and relates to a complex transportation condition asymmetric steel-concrete composite beam installation process. BACKGROUND

[0002] In bridge construction, the side pier close to the bank is constructed while the composite beam on the water surface and land is transported and constructed, and sometimes there are complex terrain structures such as embankments, ditches or river tributaries on the land of the river bank, which hinder the transportation and construction of the composite beam. For example, the Caoe River embankment and the slope protection structure, and the Huan Tangnan River on the river bank are located between the side pier, the main pier and the auxiliary pier involved in the bridge construction, so that the bridge transportation condition of the part is very complex, and it is difficult to guarantee the construction efficiency, and the construction time of the embankment area is prolonged, which further affects the surrounding traffic. Therefore, how to guarantee the normal construction of the side pier part of the bridge, save the construction time and minimize the influence on the surrounding traffic of the construction area through technical means has become a technical problem to be solved. SUMMARY

[0003] The application aims to provide a complex transportation condition asymmetric steel-concrete composite beam installation process, which is used to solve the technical problem that it is difficult to reduce the construction time and increase the influence on the surrounding traffic when the complex terrain structure existing on the bank side hinders the transportation and construction of the composite beam in the prior art.

[0004] The complex transportation condition asymmetric steel-concrete composite beam installation process comprises the following steps: a pier-side support and a sliding support are built, the sliding support is arranged along the direction of the bridge and crosses the complex terrain structure that hinders the transportation and construction of the composite beam, one end of the sliding support extends to the edge of the water area beside the main pier, and the other end is provided with a scattered assembly site and a pedestal; the scattered parts of part of the side span composite beam are transported to the scattered assembly site by land, and part of the side span composite beam and the middle span composite beam are transported to the water area where the main pier is located by water; the composite beam scattered parts are hoisted by a floating crane, and the composite beam of the main pier top section is assembled on the top of the main pier; the bridge deck of the pier top section is installed by a tower crane; the remaining section composite beam of the pier top is installed, and the bridge deck of the remaining section composite beam of the pier top is installed; a pair of bridge deck cranes are arranged on the bridge deck of the pier top, and the side span and middle span composite beams are symmetrically installed from the middle of the main pier to both sides, and the corresponding bridge deck is installed by a beam transport vehicle and an automobile crane; on land, the composite beam scattered parts are assembled into a composite beam in the scattered assembly site, and then transported to the position of the land hoisting beam by the sliding support, and hoisted and fixed by the bridge deck crane; the composite beam of the closing section is finally installed in the water, and the bridge deck of the closing section is installed; after the composite beam is hoisted, the pier-side support and the sliding support are removed.

[0005] Preferably, an assembly platform is set on the assembly site, the bottom of the sliding track is at the same height as the top surface of the assembly platform, a sliding cylinder is set on the sliding track, one end of the sliding cylinder is bolted to the track groove of the sliding track through a connecting seat, and the other end is welded to the slider through a connecting seat. The slider slides along the track groove, and a load-bearing structure for bearing the composite beam is installed on the slider.

[0006] Preferably, the complex terrain structure includes a levee above ground level and a shallow river below ground level. The sliding track adopts a segmented structure and includes a first track segment and a second track segment. The bottom elevation of the first track segment is equal to the elevation of the top surface of the levee. One end of the first track segment extends to the edge of the water area next to the main pier, while the other end crosses the levee and is located between the levee and the shallow river. The first end of the first track segment away from the main pier is provided with the assembly area and assembly platform one. The top surface of the foundation of the second track segment is flush with the ground. One end of the second track segment extends to the end of the first segment, while the other end crosses the shallow river and is provided with the assembly area and assembly platform two.

[0007] Preferably, the process includes the following steps:

[0008] Construct the pier-side support structure at the main pier;

[0009] Lift and install the middle beam segment on the top of the main pier;

[0010] Lift and install the beam segments on both sides of the main pier top;

[0011] The self-propelled piers are used to lift and install the first segment of the middle span and the first segment of the side span to both sides.

[0012] The bridge deck installation equipment was lifted onto the installed bridge deck using a floating crane.

[0013] The beams are taken from the transport ship by the girder erecting crane, and the composite beams on the bridge are hoisted and fixed until the composite beams of the side spans begin to enter the land section.

[0014] A sliding support frame is erected to traverse complex terrain structures, and the corresponding composite beams are assembled in the assembly site. The beams are then slid to the lifting position via the sliding support frame.

[0015] The beams on land for the side spans were taken from the sliding supports, and the beams for the middle spans were taken from the transport ship, thus completing the lifting and installation of the composite beams outside the closure section of the middle span.

[0016] Dismantle the gantry crane;

[0017] The closure section was installed using hoisting equipment on the bridge deck;

[0018] Tensioning prestressing, adjusting cables, and dismantling supports.

[0019] Preferably, when the sliding track adopts a segmented structure and includes a first track segment and a second track segment, the lifting and installation of the composite beam of the land portion of the side span includes:

[0020] After the crawler crane assembles the composite beams on the first section of the track, it slides the assembled composite beams to the lifting position. The composite beams of the side spans are taken from the first section of the sliding track, thus realizing the lifting and installation of the composite beams.

[0021] When the installation of the composite beam reaches the segment position of the sliding support, the corresponding composite beam is assembled in the assembly site and assembly platform 2 of the first section of the track. Then, the composite beam is disassembled and the parts are transported to the assembly site and assembly platform 1 of the second section of the track, and the composite beam is restored and reassembled as the mother beam.

[0022] The restored main beam is slid to the lifting position via the second section of the track for lifting and installation;

[0023] After the crawler crane assembles the composite beams on the second assembly platform of the second track section, it slides the assembled composite beams to the lifting position. The composite beams of the side span are taken from the second track section to realize the lifting and installation of the composite beams until the last composite beam of the side span is installed.

[0024] The composite beam of the last segment of the side span is cut according to the actual measured segment length, and then lifted and installed.

[0025] Preferably, the process includes one cycle of installing the composite beam, the cycle including: installing one segment of the side span; symmetrically positioning and installing the first segment of the middle span; installing one stay cable for the corresponding segment of the composite beam; installing the bridge deck for the corresponding two segments; installing two stay cables for the corresponding segment of the composite beam; and repeating the cycle to complete the installation of the composite beam.

[0026] Preferably, the assembly section, which is installed using bridge deck hoisting equipment, includes:

[0027] Ensure that the bridge deck and wet joints in all areas except the mid-span closure section are completed;

[0028] The actual length of the closure section was measured, and the closure section in the middle span was matched and cut;

[0029] The longitudinal and transverse beams of the closure section were installed in parts using a truck crane on the bridge deck;

[0030] Release temporary consolidation;

[0031] The bridge deck of the closure section was hoisted and the wet joint was poured.

[0032] This invention has the following advantages: This solution transports the composite beams via both waterways and land routes. On land, the composite beam components are transported to a pre-assembly site for assembly. Waterways, due to their high load-bearing capacity, transport the complete composite beams to the corresponding waterways. In existing technologies, the land-based portion typically involves assembling the composite beams and then hoisting them using bridge cranes. The pre-assembly site is then used for transport and movement along with the bridge assembly using land-based equipment. However, this solution addresses scenarios with complex terrain structures that hinder the transport of the composite beams and their components, making assembly and hoisting difficult on such complex terrain. Therefore, this solution, in addition to constructing pier-side supports, also constructs sliding supports on land capable of traversing complex terrain structures. The composite beams are assembled at the pre-assembly site at the fixed end of the sliding supports, and the sliding supports facilitate the transfer of the composite beams, allowing them to traverse or temporarily remain at the location of the complex terrain structure. In this way, when installing the composite beams of the side spans, the side span girder erecting crane takes the beams from the sliding support at the corresponding position, thus enabling this solution to overcome the adverse effects of complex terrain on bridge construction. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the lifting and installation of the middle beam segment on the top of the main pier in an asymmetric steel-concrete composite beam installation process under complex transportation conditions according to the present invention.

[0034] Figure 2 This is a schematic diagram of the lifting and installation of beam segments on both sides of the top of the main pier during the installation process of an asymmetric steel-concrete composite beam under complex transportation conditions in this invention.

[0035] Figure 3 This is a schematic diagram illustrating the installation process of an asymmetric steel-concrete composite beam under complex transportation conditions in this invention, specifically during the lifting and installation of the side span and middle span over the waterway.

[0036] Figure 4 This is a schematic diagram illustrating the process of setting up the sliding track and starting the hoisting and installation of the land portion of the side span in an asymmetric steel-concrete composite beam installation process under complex transportation conditions, as described in this invention.

[0037] Figure 5 This is a schematic diagram illustrating the process of lifting and installing the land portion of the side span to the segmented position of the sliding track during the installation of an asymmetric steel-concrete composite beam under complex transportation conditions, as described in this invention.

[0038] Figure 6 This is a schematic diagram of the lifting and installation of the closure section in an asymmetric steel-concrete composite beam installation process under complex transportation conditions according to the present invention.

[0039] Figure 7 This is a diagram showing the arrangement of the sliding track in this invention.

[0040] Figure 8This is a structural diagram showing the installation of the sliding cylinder on the sliding track in this invention.

[0041] The labels in the attached diagram are as follows: 1. Main pier, 2. Floating crane, 3. Embankment, 4. Shallow river, 5. Girder erecting crane, 6. Sliding track, 61. First track segment, 62. Second track segment, 63. Assembly platform two, 64. Assembly platform one, 7. Crawler crane, 8. Truck crane, 9. Sliding cylinder, 10. Sliding block. Detailed Implementation

[0042] The following detailed description of the embodiments, with reference to the accompanying drawings, will further illustrate the specific implementation of the present invention, in order to help those skilled in the art to have a more complete, accurate, and in-depth understanding of the inventive concept and technical solution of the present invention.

[0043] like Figures 1-8 As shown, this invention discloses an installation process for asymmetric steel-concrete composite beams under complex transportation conditions, including: constructing pier-side supports and sliding supports, wherein the sliding supports are set along the direction of the bridge section and cross complex terrain structures that hinder the transportation and construction of the composite beams; one end of the sliding supports extends to the edge of the water area next to the main pier 1, while the other end is provided with a land assembly site and platform for the composite beams; some components of the side span composite beams are transported to the assembly site by land, while some side span composite beams and the middle span composite beams are transported to the water area where the main pier 1 is located by waterway; the composite beam components are hoisted using a floating crane 2 and assembled on the top of the main pier 1 to form the composite beam of the top section of the main pier 1; the bridge deck of the top section is installed using a tower crane; and the remaining composite beam segments at the top of the pier are installed. The first pair of stay cables were installed and tensioned for the first time. The bridge deck of the remaining composite beam segments was then installed on the pier top. A pair of bridge deck cranes were set up on the bridge deck at the pier top to symmetrically install the composite beams of the side spans and the middle span from the middle of the main pier 1 to both sides, while one stay cable was installed simultaneously. The bridge deck was installed using a beam transport vehicle and a truck crane via the cranes on the pier top. The installation of the bridge deck lagged behind that of the composite beams. Two stay cables were installed simultaneously during the installation of the bridge deck. In the land section, the composite beam components were assembled into composite beams at the assembly site and then transported to the land lifting and retrieval position via sliding supports. The bridge deck cranes then lifted and fixed the beams. In the water section, the final composite beam segment was installed, followed by the bridge deck of the closure segment. After the composite beams were installed, the supports beside the piers and the sliding supports were removed.

[0044] An assembly platform is set up on the assembly site. The bottom of the sliding track 6 is at the same height as the top surface of the assembly platform. A sliding cylinder 9 is set on the sliding track 6. One end of the sliding cylinder 9 is bolted to the track groove of the sliding track 6 through a connecting seat, and the other end is welded to the slider 10 through a connecting seat. The slider 10 slides along the track groove, and a load-bearing structure of a load-bearing composite beam is installed on the slider 10.

[0045] The complex terrain structure includes a levee 3 above ground level and a shallow river 4 below ground level. The sliding track 6 adopts a segmented structure and includes a first track segment 61 and a second track segment 62. The bottom elevation of the first track segment 61 is equal to the top elevation of the levee 3. One end of the first track segment 61 extends to the edge of the water next to the main pier 1, while the other end crosses the levee 3 and is located between the levee 3 and the shallow river 4. The first end of the first track segment 61 away from the main pier 1 is provided with the assembly area and assembly platform 64. The top surface of the foundation of the second track segment 62 is flush with the ground. One end of the second track segment 62 extends to the end of the first segment, while the other end crosses the shallow river 4 and is provided with the assembly area and assembly platform 63.

[0046] The specific steps of the above method are as follows:

[0047] Step 1: Construct the pier-side support at the main pier 1.

[0048] Specifically, this includes: 1. Constructing a support frame beside the pier. 2. Installing temporary vertical fixing pads. 3. Installing permanent vertical supports (without grouting) and pre-embedded parts for the damper on the pier top. 4. Pre-positioning the damper in its installation location (without installing the pin).

[0049] Step 2: Lift and install the middle beam segment on the top of the main pier 1.

[0050] Specifically, the process includes: 1. The floating crane 2 on the water advances and reduces the angle of its main boom; 2. Using a 160t floating crane 2, the main longitudinal beams and transverse beams of the middle beam segment (TB0 segment) on the top of the main pier 1 (i.e., the side pier, main pier 116#) are lifted and installed, and jacks are used to adjust them to the designed alignment. At this time, the main boom is 60m long, the main boom inclination angle is 58°, the lifting width is 32.9m, the crane's rated lifting capacity is 50t * 0.9 = 45t, and the combined beam weighs 40t, which meets the requirements. 3. Using the 160t floating crane 2 in conjunction with the tower crane, the bridge deck (B1, Z1) of the middle beam segment (TB0 segment) is installed in place.

[0051] Step 3: Lift and install the beam segments on both sides of the top of the main pier 1.

[0052] Specifically, the process includes: 1. Using a 160t floating crane (2 units), install the main pier 1's top section SB0 on ​​one side of the span (the left-side vent is not installed yet). 2. Install the beam lowering support on the left side of the SB0 section. At this point, the main boom is 60m long, the main boom angle is 68°, the maximum lifting width is 22.1m, the crane's rated lifting capacity is 90t * 0.9 = 81t, and the combined beam's maximum weight is 40t, meeting the requirements. 3. Symmetrical positioning (again using the 160t floating crane (2 units) symmetrically positioned relative to the centerline of the main pier 1) and install the main pier 1's top section MB0 on ​​one side of the mid-span. 4. Using the 160t floating crane (2 units) in conjunction with a tower crane, install the bridge deck panels B2-4 and Z2-4 of the SB0 and MB0 sections. 5. Grout the permanent supports. 6. Construct the longitudinal beam bridge deck platform.

[0053] Step 4: The first segment of the middle span and the first segment of the side span are hoisted and installed on both sides of the self-propelled pier 1.

[0054] Specifically, this includes: 1. Installing the longitudinal and lateral limiting and vertical fixing of the main pier 1. 2. Using a 160t floating crane 2 to install the first segment of the side span beam (i.e., segment SB1-1, which is also the first composite beam extending from the main pier 1 to the side span). At this time, the main boom is 60m, the main boom inclination angle is 69°, the maximum lifting width is 21.9m, the crane's rated lifting capacity is 90t*0.9=81t, and the heaviest composite beam is 40t, which meets the requirements. 3. Symmetrically positioning and installing the first segment of the middle span beam (i.e., segment MB1-1, which is also the first composite beam extending from the main pier 1 to the middle span). 4. One stay cable on both sides (SC1\MC1). 5. Using the 160t floating crane 2 in conjunction with the tower crane to install the bridge deck B5-6 and Z5-6 of the two composite beams SB1-1 and MB1-1. 6. Two stay cables on both sides (SC1\MC1).

[0055] The above steps include one round of installing the composite beam, which includes: installing one segment of the side span; symmetrically positioning and installing one segment of the corresponding middle span; installing one stay cable for the corresponding segment of the composite beam; installing the bridge deck for the two corresponding segments; and installing two stay cables for the corresponding segment of the composite beam.

[0056] Step 5: Use floating crane 2 to lift the bridge deck installation equipment onto the installed bridge deck.

[0057] Specifically, this includes: 1. Using a 160t floating crane 2 to lift an 80t truck crane 8 and a 13m flatbed truck to the bridge deck. 2. Using a 160t floating crane 2 to install a 200t girder erecting crane 5 in the middle span. 3. Symmetrically positioning and installing 200t girder erecting cranes 5 in the side spans. 4. Installing an inspection vehicle.

[0058] Step Six: Use the gantry crane 5 to hoist the next segment of the composite beam in the middle and side spans.

[0059] Specifically, the process includes: 1. The mid-span girder erecting crane 5 retracts one crossbeam position, while the side span remains stationary. 2. The mid-span girder erecting crane 5 lifts the mid-span MB2-1 segment with a lifting width of 9.7m. 3. The mid-span girder erecting crane 5 returns to its original position, and the side span girder erecting crane 5 retracts one crossbeam position. 4. The side span girder erecting crane 5 lifts the side span SB2-1 and SB2-2 segments with a lifting width of 9.7-17.6m. 5. The mid-span girder erecting crane 5 retracts one crossbeam position, and the side span returns to its original position. 6. The mid-span girder erecting crane 5 lifts the mid-span MB2-2 segment with a lifting width of 17.6m. 7. The mid-span girder erecting crane 5 returns to its original position. 8. One SC2 / MC2 stay cable.

[0060] Step 7: The girder erecting crane 5 advances to the erection position of the next segment in the middle and side spans and anchors it.

[0061] Specifically, this includes: 1. The side / mid-span girder erecting crane 5 advances to the erection position of side span SB3-1 / mid-span MB3-1 and anchors it. 2. The side / mid-span girder erecting crane 5 lifts and installs side span SB3-1 / mid-span MB3-1, with a lifting width of 13.7m. 3. One SC3 / MC3 stay cable.

[0062] Step 8: Repeat the process to complete the hoisting and fixing of the composite beams on the bridge until the composite beams of the side spans begin to enter the land section.

[0063] Specifically, this includes: 1. Repeating the installation process until the side span SB5-1 / middle span MB5-1 is completed and one SC5 / MC5 stay cable is installed (subsequent construction must begin on at least one side of the bridge). 2. Installing bridge deck panels B7-8 and Z7-8 using an 80t truck crane. 3. Pouring concrete for the bottom slab of the longitudinal beam of main pier 1. 4. Pouring the wet joint of B7-Z7. 5. Installing two SC2 / MC2 stay cables.

[0064] Step 9: Construct a sliding support frame that traverses complex terrain structures, assemble the corresponding composite beams in the assembly site, and slide them to the lifting position via the sliding support frame.

[0065] Specifically, this includes: 1. Repeating the installation cycle until the side span SB6-2 / middle span MB6-2 is completed (the side span segments have appeared on land); 2. Constructing sliding supports across the embankment and small river channels; (installed simultaneously with the supports next to the piers); 4. The side span segments SB7-1 and thereafter are transported in loose parts to the bridge site, and then assembled in 1+1 by a 200T crawler crane on the assembly platform 64. The assembled composite beam is then slid to the lifting position (located on the first segment 61 of the track).

[0066] The assembly process involves assembling disassembled components into composite beams. In this scheme, the composite beams used for the land section are assembled using a 1+1 assembly method. This means that after assembling the first composite beam for the land section (side span SB7-1), this composite beam is used as the parent beam to match and assemble the next composite beam, ensuring accurate matching and installation between the two composite beams. Subsequent assembly processes also follow the same principle, using the next composite beam obtained from the previous 1+1 assembly as the parent beam for assembling the next composite beam segment.

[0067] Step 10: The land portion of the side span is lifted from the sliding support, and the middle span is lifted from the transport ship to complete the lifting and installation of the composite beam until the composite beam on one side of the main pier 1 reaches the segment position of the sliding support.

[0068] Specifically, this includes: 1. The side span SB7-1 and subsequent segments are removed from the sliding support, while the middle span is removed from the transport ship; this process is repeated until the side span SB11-1 and the middle span MB11-1 are installed. 2. After the side span SB12-1 is assembled in the assembly area one (the assembly site of the first track segment 61 and the corresponding assembly platform one 64), the composite beam is disassembled and the parts are transported to the assembly area two (the assembly site of the second track segment 62 and the corresponding assembly platform two 63), where the composite beam is restored and reassembled. Here, the composite beam is used as the parent beam for assembly.

[0069] Step 11: Repeat the above steps until the side span composite beam SB12-1 and the middle span composite beam MB12-1 are installed.

[0070] Specifically, this includes: 1. Repeating the cycle until the side span SB12-1 / middle span MB12-1 is installed. 2. After measuring the installed composite beams, cut and install SB12-2.

[0071] Step 12: Repeat the cycle until the side span SB16-1 / middle span MB16-1 is installed.

[0072] Specifically, this includes: 1. Repeating the cycle until the installation of side span SB16-1 / middle span MB16-1 is completed (at this point, the assembly of the composite beam is carried out on the second-stage assembly platform 63, and the composite beam is slid and removed on the second section 62 of the track, completing the installation of the composite beam at the corresponding position of the second section 62 of the track). 2. Transferring side span SB18-1. 3. The side span girder erecting crane 5 lifts and installs side span SB17-1, with a lifting width of 14.8m.

[0073] Step 13: The side span girder erecting crane 5 lifts and installs the side span SB18-1.

[0074] Specifically, the process includes: 1. The side span girder erecting crane 5 advances to the erection position of side span SB18-1 and anchors it, while the middle span girder erecting crane 5 remains stationary. 2. The actual segment length is measured, and SB18-1 is cut accordingly. 3. The side span girder erecting crane 5 lifts and installs side span SB18-1, with a lifting width of 10.8 to 16.5 meters.

[0075] Step Fourteen: Dismantle the gantry crane 5.

[0076] Specifically, this includes: 1. Dismantling of the mid-span girder erecting crane 5. 2. Dismantling of the side-span girder erecting crane 5.

[0077] Step 15: Use the bridge deck hoisting equipment to install the beams of the closure section in parts.

[0078] Specifically, this includes: 1. Completion of bridge deck and wet joint construction in all areas except the mid-span closure section. 2. Measurement of the closure section length and matching of the mid-span closure section (MHB). 3. Installation of the longitudinal and transverse beams of the closure section MHB using an 80t truck crane with 8 loose parts. At this point, the main boom is 17.3m, the lifting radius is 10m, the rated lifting weight is 27.3*0.9=24.6t, and the maximum weight of the composite beam is 22t, meeting the requirements. 4. Removal of temporary consolidation.

[0079] Step 16: Hoist the bridge deck of the closure section and complete the wet joint pouring.

[0080] Specifically, this includes: 1. Installing bridge decks Z51 and ZH using an 80t truck crane; pouring the wet joint between Z50 and Z51. 2. Removing the beam lowering support. 3. Installing the air nozzles for the side span SB0 using an 80t truck crane.

[0081] Step 17: Tension the prestressed cables, adjust the cables, and dismantle the support structure.

[0082] Specifically, this includes: 1. Tensioning the prestressed steel in the mid-span and side spans. 2. Adjusting the cables throughout the bridge. 3. Dismantling the pier-side supports. 4. Dismantling the sliding supports.

[0083] Finally, install the auxiliary components, apply the final coat of paint, and prepare for acceptance.

[0084] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. An installation process for asymmetric steel-concrete composite beams under complex transportation conditions, characterized in that: include: A pier-side support and a sliding support are constructed. The sliding support is set along the direction of this section of the bridge and crosses complex terrain structures that hinder the transportation and construction of the composite beam. One end of the sliding support extends to the edge of the water area next to the main pier (1), while the other end is equipped with a disassembly site and a platform. Some of the disassembled components of the side span composite beams are transported to the disassembly site by land, while some of the side span composite beams and the middle span composite beams are transported to the water area where the main pier (1) is located by waterway. The disassembled components of the composite beams are hoisted using a floating crane (2) and assembled on the top of the main pier (1) to form the composite beam of the top section of the main pier (1). The bridge deck of the top section is constructed using a tower crane. Installation is carried out; the remaining segment composite beams at the top of the pier are installed, and then the bridge deck of the remaining segment composite beams at the top of the pier is installed; a pair of bridge deck cranes are set up on the bridge deck at the top of the pier, and the composite beams of the side spans and the middle span are installed symmetrically from the middle of the main pier (1) to both sides, and the corresponding bridge decks are installed by beam transport vehicles and truck cranes; in the land part, the composite beam components are assembled into composite beams in the assembly site and then transported to the land lifting beam position by sliding supports, and are fixed by bridge deck cranes; in the water part, the composite beams of the closure section are installed last, and the bridge deck of the closure section is installed; after the composite beams are hoisted, the supports and sliding supports beside the pier are removed.

2. The installation process for an asymmetric steel-concrete composite beam under complex transportation conditions according to claim 1, characterized in that: An assembly platform is set up on the assembly site. The bottom of the sliding track (6) is at the same height as the top surface of the assembly platform. A sliding cylinder (9) is set on the sliding track (6). One end of the sliding cylinder (9) is bolted to the track groove of the sliding track (6) through a connecting seat, and the other end is welded to the slider (10) through a connecting seat. The slider (10) slides along the track groove. A load-bearing structure for the load-bearing composite beam is installed on the slider (10).

3. The installation process for an asymmetric steel-concrete composite beam under complex transportation conditions according to claim 2, characterized in that: The complex terrain structure includes a embankment (3) above the ground and a shallow river (4) below the ground. The sliding track (6) adopts a segmented structure and includes a first track segment (61) and a second track segment (62). The bottom elevation of the first track segment (61) is equal to the elevation of the top surface of the embankment (3). One end of the track segment extends to the edge of the water next to the main pier (1), while the other end crosses the embankment (3) and is located between the embankment (3) and the shallow river (4). The first track segment (61) is provided with the assembly site and assembly platform one (64) at the end away from the main pier (1). The top surface of the foundation of the second track segment (62) is flush with the ground. One end of the second track segment (62) extends to the end of the first segment, while the other end crosses the shallow river (4) and is provided with the assembly site and assembly platform two (63).

4. The installation process for asymmetric steel-concrete composite beams under complex transportation conditions according to any one of claims 1-3, characterized in that: Includes the following steps: Construct a support frame next to the main pier (1); Lifting and installing the middle beam section of the main pier (1) at the top of the pier; Lift and install the beam segments on both sides of the pier top of the main pier (1); The self-propelled pier (1) is used to lift and install the first segment of the middle span and the first segment of the side span to both sides; The bridge deck hoisting equipment is lifted onto the installed bridge deck using a floating crane (2); The beams are taken from the transport ship by the girder crane (5) to complete the hoisting and fixing of the composite beams on the bridge until the composite beams of the side spans begin to enter the land section; A sliding support frame is erected to traverse complex terrain structures, and the corresponding composite beams are assembled in the assembly site. The beams are then slid to the lifting position via the sliding support frame. The beams on land for the side spans were taken from the sliding supports, and the beams for the middle spans were taken from the transport ship, thus completing the lifting and installation of the composite beams outside the closure section of the middle span. Dismantle the girder erecting crane (5); The closure section was installed using hoisting equipment on the bridge deck; Tensioning prestressing, adjusting cables, and dismantling supports.

5. The installation process for an asymmetric steel-concrete composite beam under complex transportation conditions according to claim 4, characterized in that: When the sliding track (6) adopts a segmented structure and includes a first track segment (61) and a second track segment (62), the lifting and installation of the composite beam of the land portion of the side span includes: After the crawler crane (7) assembles the composite beam on the assembly platform of the first section (61) of the track, it slides the assembled composite beam to the lifting position. The composite beam of the side span is taken from the first section (61) of the track of the sliding track (6) to realize the lifting and installation of the composite beam. When the installation of the composite beam reaches the segment position of the sliding support, the corresponding composite beam is assembled in the assembly site and assembly platform one (64) of the first section (61) of the track. Then the composite beam is disassembled and the parts are transported to the assembly site and assembly platform two (63) of the second section (62) of the track, and the composite beam is restored and reset as the mother beam for assembly. The restored mother beam is slid to the lifting position via the second section (62) of the track for lifting and installation; After the crawler crane (7) assembles the composite beam on the assembly platform of the second section (62) of the track, it slides the assembled composite beam to the lifting position. The composite beam of the side span is taken from the second section (62) of the track of the sliding track (6) to realize the lifting and installation of the composite beam until the composite beam of the last section of the side span. The composite beam of the last segment of the side span is cut according to the actual measured segment length, and then lifted and installed.

6. The installation process for an asymmetric steel-concrete composite beam under complex transportation conditions according to claim 4, characterized in that: The installation of the composite beam is carried out in one cycle, which includes: installing one segment of the side span; symmetrically positioning and installing the first segment of the middle span; installing one stay cable for the corresponding segment of the composite beam; installing the bridge deck for the corresponding two segments; installing two stay cables for the corresponding segment of the composite beam; and repeating the cycle to complete the installation of the composite beam.

7. The installation process for an asymmetric steel-concrete composite beam under complex transportation conditions according to claim 4, characterized in that: The installation of the closure section using bridge deck hoisting equipment for disassembled components includes: Ensure that the bridge deck and wet joints in all areas except the mid-span closure section are completed; The actual length of the closure section was measured, and the closure section in the middle span was matched and cut; The longitudinal and transverse beams of the closure section were installed using a truck crane (8) on the bridge deck. Release temporary consolidation; The bridge deck of the closure section was hoisted and the wet joint was poured.

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