A precise installation system and construction method for steel main beam construction

Abstract

The present invention provides a precise installation system and construction method for steel main beam construction, which belongs to the field of building construction technology. The system is applied to steel box beams, including a gantry crane, an assembly frame, a carrying frame and a carrying trolley. Several steel box beams are welded in sequence to form a steel main beam of the bridge. The gantry crane is arranged on one side of the bridge bank. The assembly frame is evenly arranged below the gantry crane. The assembly frame includes a first steel pipe pile, a first distribution beam and a supporting horse stool. The carrying frame extends from the bank side close to the assembly frame to the opposite bank along the extension direction of the bridge. The carrying frame includes a second steel pipe pile, a second distribution beam, a track and a support column. The carrying trolley includes a frame, wheels, a lifting platform and a telescopic machine. The carrying trolley is used for transportation, installation and adjustment of steel box beams. The system quickly and effectively simplifies the construction process of assembling, carrying and precise positioning of steel beams of the main beam structure, reduces construction difficulty, improves construction efficiency, ensures construction quality and saves construction costs.

Description

Technical Field

[0001] The present invention belongs to the technical field of building construction, and in particular relates to a precise installation system and a construction method for steel main beams. Background Art

[0002] With the development of my country's national economy and transportation industry, higher requirements have been placed on urban bridge construction. Steel girder construction, a crucial step in bridge construction, is typically installed and constructed using two methods: hoisting and jacking. The hoisting method is difficult to control installation precision, imposes high requirements on the construction environment, and requires clear clearance under the bridge. The jacking method is currently the mainstream method for installing steel box girders in bridge construction. It offers a high safety factor, low requirements on the working environment, and easy control of steel box girder installation precision.

[0003] The jacking method is to place the slide on the track, the box beam on the slide, and use a hydraulic cylinder to push the slide to make the slide slide on the track. The slide cantilever is extended to connect the pillar foundations on both sides, and then the box beam is moved on the slide for assembly. In this process, the limitation of the cantilever bending moment is collected. The scope of operation is first of all, the construction cost of large-span bridge construction is high, the economy is poor, and the slide operation area is large. It is more troublesome to use for projects with limited construction sites. The installation process is cumbersome, which affects the construction progress. Summary of the Invention

[0004] The embodiments of the present invention provide a precise installation system and construction method for steel main beam construction, which makes good use of limited working space, quickly and effectively simplifies the construction process of assembling, transporting and precisely positioning steel box beams, reduces construction difficulty, improves construction efficiency, ensures construction quality, and saves construction costs.

[0005] In view of the above problems, the technical solution proposed by the present invention is:

[0006] A precise installation system for steel main beam construction is applied to steel box beams, including a gantry crane, an assembly frame, a transport frame and a transport trolley. Several steel box beams are welded in sequence to form a bridge steel main beam. The gantry crane is set on one side of the bridge bank. The assembly frames are evenly arranged below the gantry crane. The assembly frames are used for temporary support when assembling the steel box beams. The assembly frames include a first steel pipe pile, a first distribution beam and a support horse stool. The steel box beam is placed on the support horse stool when splicing. The transport frames are provided in two groups and are arranged in parallel. Between the assembly frames, the carrying frame extends along the extension direction of the bridge from the shore side close to the assembly frame to the opposite bank. The carrying frame is used for the transportation and support of the steel box girder. The carrying frame includes a second steel pipe pile, a second distribution beam, a track and a support column. There are at least four carrying trolleys, and they are all movably arranged above the track. The carrying trolley includes a frame, wheels, a lifting platform and a telescopic machine. The top of the lifting platform abuts against the bottom of the steel box girder. The carrying trolley is used for the transportation, installation and adjustment of the steel box girder.

[0007] As a preferred technical solution of the present invention, an unloading area and a splicing area are provided below the gantry crane. The unloading area is used for unloading and lifting the split beam sections of the steel box beam, and the splicing area is used for splicing and forming the beam sections.

[0008] As a preferred technical solution of the present invention, the first steel pipe pile is vertically inserted into the shore base surface, the first distribution beam is horizontally arranged at the top of the first steel pipe pile and welded and fixed to the first steel pipe pile, and the supporting horse stool is arranged at the top of the first distribution beam and abuts against the bottom of the steel box beam.

[0009] As a preferred technical solution of the present invention, the second steel pipe pile is vertically inserted into the shore base ground and the riverbed, the second distribution beam is horizontally arranged on the top of the second steel pipe pile and welded and fixed to the second steel pipe pile, the top of the second distribution beam is fixedly connected to a Bailey frame, and track beams are equidistantly arranged on the top of the Bailey frame, the track is fixedly connected to the top of the track beam, and the track beam is perpendicular to the extension direction of the track.

[0010] As a preferred technical solution of the present invention, the support columns are symmetrically arranged on both sides of the Bailey frame, the bottom ends of the support columns are welded and fixed to the top of the second distribution beam, the top ends of the support columns are flush with the bottom elevation of the steel box beam, and after the steel box beam is precisely docked, its bottom abuts against the top of the support columns.

[0011] As a preferred technical solution of the present invention, there are four wheels, which are symmetrically arranged at the four corners of the bottom of the frame. The wheels are all rollingly connected to the top of the track. The lifting platform is slidingly set on the top of the frame. There are two telescopic machines, which are symmetrically arranged on both sides of the lifting platform. The movement direction of the output end of the telescopic machine is perpendicular to the moving direction of the pack cart, and the output end of the telescopic machine is fixedly connected to the side of the lifting platform.

[0012] As a preferred technical solution of the present invention, the lifting platform and the telescopic machine are both connected to a hydraulic controller.

[0013] As a preferred technical solution of the present invention, a drive motor is provided on one side of the frame, and the output end of the drive motor is fixedly connected to the central axis of one of the wheels. A brake is provided on one side of the frame, and the output end of the brake abuts against the top of the track when extended.

[0014] As a preferred technical solution of the present invention, matching pieces for butting are provided on both sides of the steel box beam, and two adjacent groups of the steel box beams are welded and fixed by the matching pieces.

[0015] In another aspect, a method for constructing a precise installation system for a steel main beam includes the following steps:

[0016] S1, gantry crane installation, uses a total station to locate and lay out the lines. According to the construction drawings, taking into account the site environment and construction space, the position of the gantry crane foundation is located. The gantry crane's load-bearing beams and sliding rails are laid in sequence. The gantry crane is then assembled, and the unloading area and splicing area are distinguished.

[0017] S2, set up the assembly frame, drive the first steel pipe pile into the splicing area according to the design drawings, and weld the first distribution beam on top of the first steel pipe pile;

[0018] S3: Erect the piggyback frame, drive the second steel pipe pile according to the position and direction of the bridge in the design drawings, weld the second distribution beam on top of the second steel pipe pile, and then assemble the Bailey frame on top of the second distribution beam along the extension direction of the bridge. Simultaneously, weld the track beam on top of the Bailey frame, and then lay the track on top of the track beam along the extension direction of the bridge.

[0019] S4, steel box girder assembly and welding: The prefabricated beam segments are hoisted and placed on the assembly frame in sequence by a gantry crane. A supporting saddle is placed at the bottom of the frame to adjust the horizontal elevation of the steel box girder. Then, the longitudinal butt welding between the top / bottom plate units, the welding between the web and the top / bottom plate units, the welding between the diaphragm and the bottom plate / web, and the transverse butt welding of the diaphragm are carried out in sequence. All welds are then inspected by ultrasonic flaw detection.

[0020] S5, steel box girder transport: During the steel box girder assembly process, the transport trolley is tested. After the steel box girder assembly is completed, the transport trolley is moved to the bottom of the steel box girder. The hydraulic controller is used to push out the lifting platform to fully lift the steel box girder and separate it from the supporting saddle. The drive motor is then started to transport the steel box girder along the track to the predetermined position.

[0021] S6, precise positioning of the steel box girder. Adjustment of the steel box girder line shape is performed through instrument measurement. The hydraulic controller controls the lifting platform to adjust the elevation of the steel box girder. The two telescopic cranes are controlled to move the lifting platform horizontally and adjust the horizontal position of the steel box girder so that it is precisely aligned with the previous section of the steel box girder. The matching parts are then connected and temporary welding is performed.

[0022] S7, the trolley is withdrawn. After the temporary welding is completed, support columns are installed on both sides of the trolley, and their ends are welded and fixed to the second distribution beam and the bottom of the steel box beam respectively. Then, the lifting platform is lowered to separate it from the bottom of the steel box beam. The brake is released and the drive motor is started to withdraw the trolley from under the steel box beam and prepare for the next round of consignment work;

[0023] S8, circumferential welding of the steel main beam, repeating steps S4-S7 until the closing section steel box beam is in place and temporary welding is completed, and then permanent welding is performed from both sides of the bridge to the middle. After the welding of the steel main beam is completed, the temporarily welded components are cut off and polished to make them smooth.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) Use the powerful lifting capacity of the gantry crane to lift the beam segment components, and complete the assembly and welding of the top plate, web plate, rib plate and other components on the assembly frame;

[0026] (2) By setting up a carrying frame and laying a sliding track, the carrying trolley can move back and forth in the working space and complete the carrying task of all steel box girders. The carrying frame is set under the bridge and does not occupy other space. The carrying trolley has a small operating space, which effectively saves the operating space of the system. It has a wide range of applications and has good promotion prospects.

[0027] (3) The position of the steel box girder is precisely adjusted using the power system and jacking displacement system of the trolley. With the assistance of measuring instruments and staff, the steel box girder is precisely docked. The operation is simple, the adjustment is convenient and fast, and the construction efficiency and quality are effectively guaranteed.

[0028] (4) By setting a support column on the top of the carrying frame to temporarily support the steel box girder, it is convenient to release the heavy load of the carrying trolley after the steel box girder is fixed, so that the carrying trolley can continue to carry out the consignment work, thereby improving work efficiency.

[0029] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the cross-sectional structure of a shore foundation of a steel main beam construction precision installation system disclosed in the present invention;

[0031] Figure 2 It is a schematic diagram of the cross-sectional structure of a riverbed of a steel main beam construction precision installation system disclosed in the present invention;

[0032] Figure 3 This is a schematic diagram of the main structure of the pack transport vehicle disclosed in the present invention;

[0033] Figure 4 This is a schematic diagram of the structure of the pack transport trolley disclosed in the present invention from a top view;

[0034] Figure 5 yes Figure 3 Cross-sectional view of AA;

[0035] Figure 6 This is a flow chart of a construction method of a precise installation system for steel main beam construction disclosed in the present invention;

[0036] Explanation of the accompanying reference numerals: 100, steel box girder; 101, gantry crane; 1011, unloading area; 1012, splicing area; 102, assembly frame; 1021, first steel pipe pile; 1022, first distribution beam; 1023, supporting horse stool; 103, carrying frame; 1031, second steel pipe pile; 1032, second distribution beam; 1033, Bailey frame; 1034, track beam; 1035, track; 1036, supporting column; 104, carrying trolley; 1041, frame; 1042, wheels; 1043, lifting platform; 1044, driving motor; 1045, telescopic machine; 1046, brake. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 making creative efforts shall fall within the scope of protection of the present invention.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0042] Example 1

[0043] Refer to the attached Figure 1-Figure 5As shown, the present invention provides a technical solution: a precise installation system for steel main beam construction, applied to steel box beams 100, including a gantry crane 101, an assembly frame 102, a carrying frame 103 and a carrying trolley 104. A plurality of steel box beams 100 are welded in sequence to form a bridge steel main beam. The steel box beams 100 are sequentially spliced ​​along the direction of the bridge from the opposite bank to the side of the shore where the splicing frame is located until they are closed to form a steel main beam. The gantry crane 101 is set on one side of the bridge shore. The gantry crane 101 is equipped with a support beam and a sliding track for hoisting the steel box beams 100. The assembly frame 102 is used to install the steel box beams 100. 2 are evenly arranged below the gantry crane 101. The assembly frame 102 is used for temporary support when assembling the steel box girder 100. The assembly frame 102 includes a first steel pipe pile 1021, a first distribution beam 1022 and a support horse stool 1023. The steel box girder 100 is placed on the support horse stool 1023 when splicing. The support horse stool 1023 is convenient for adjusting the elevation of the steel box girder 100 when splicing, ensuring the quality of the assembly of the steel box girder 100. There are two groups of carrying frames 103, which are arranged in parallel between the assembly frames 102. The carrying frames 103 are arranged along the extension direction of the bridge from the one close to the assembly frame 102. The shore side of the mounting frame 102 extends to the opposite shore. The transport frame 103 is used for transporting and supporting the steel box beam 100. At the same time, after each steel box beam 100 is transported to its place, the transport frame 103 is used for temporary support of the steel main beam before the construction of the bridge main tower and the suspension cable is completed to ensure the stability of the steel main beam. The transport frame 103 includes a second steel pipe pile 1031, a second distribution beam 1032, a track 1035 and a support column 1036. There are at least four transport carts 104, and they are all movably arranged above the track 1035. The transport cart 104 includes a frame 104. 1. Wheels 1042, lifting platform 1043 and telescopic machine 1045. The top of the lifting platform 1043 is in contact with the bottom of the steel box girder 100. The carrying trolley 104 is used for the transportation and installation adjustment of the steel box girder 100. After the carrying trolley 104 moves the steel box girder 100 to the installation position, the elevation of the steel box girder 100 is adjusted by the lifting platform 1043. The telescopic machine 1045 adjusts the horizontal position of the steel box girder 100 so that it is accurately docked with the previous section of the steel box girder 100, and the transportation is balanced. It can realize three-way adjustment and automatic deviation correction to improve construction quality and efficiency.

[0044] In an embodiment of the present invention, an unloading area 1011 and a splicing area 1012 are provided below the gantry crane 101. The unloading area 1011 is used for unloading and hoisting the split beam sections of the steel box girder 100, and the splicing area 1012 is used for splicing and forming the beam sections. Since the cross-section of the steel box girder 100 is large, it needs to be divided into various beam sections according to the load-bearing structure and prefabricated in the factory due to the influence of production and transportation. The unloading area 1011 facilitates the unloading and hoisting of each beam section after it is transported to the site. The splicing area 1012 corresponds to the splicing frame, and the hoisted beam sections are placed on the splicing frame according to their positions for splicing and assembly.

[0045] In an embodiment of the present invention, the first steel pipe pile 1021 is vertically inserted into the shore base surface, the first distribution beam 1022 is horizontally arranged at the top of the first steel pipe pile 1021, and is welded and fixed to the first steel pipe pile 1021, the supporting horse stool 1023 is arranged at the top of the first distribution beam 1022, and abuts against the bottom of the steel box beam 100, the first distribution beam 1022 distributes the gravity of the steel box beam 100 to the first steel pipe pile 1021, so that the splicing frame load is larger, the first steel pipe pile 1021 adopts a φ426mm×8mm spiral steel pipe, and the first distribution beam 1022 adopts a 45a# I-beam.

[0046] In the embodiment of the present invention, the second steel pipe pile 1031 is vertically inserted into the shore base ground and the riverbed, the second distribution beam 1032 is horizontally arranged on the top of the second steel pipe pile 1031 and is welded and fixed to the second steel pipe pile 1031. The second distribution beam 1032 distributes the load on the packing frame 103 to the second steel pipe pile 1031, so that the load on the packing frame 103 is more evenly distributed. The top of the second distribution beam 1032 is fixedly connected to the Bailey frame 1033, and the top of the Bailey frame 1033 is equidistantly provided with track beams 1034 and tracks 1035. It is fixedly connected to the top of the track beam 1034, which is perpendicular to the extension direction of the track 1035. The track beam 1034 evenly transfers the load on the track 1035 to the Bailey frame 1033. The Bailey frame 1033 has a large load-bearing capacity, strong structural rigidity, and convenient connection, which maintains the stability of the track 1035 during transportation. The second steel pipe pile 1031 adopts φ630mm×8mm spiral steel pipe with a standard spacing of 9m and a local maximum spacing of no more than 12m. The second distribution beam 1032 adopts 45a# I-beam.

[0047] Among them, the settlement monitoring of the support should be carried out throughout the entire construction process, and the arch value of the support pad can be obtained through monitoring data. If the local settlement of the support exceeds expectations during the construction process or before the system conversion, the construction should be suspended immediately and the cause of the settlement should be analyzed. The support points should be carefully checked to see if they are solid to prevent the local pipe piles from being overstressed due to eccentric loading. The settlement of local points can be calculated by calculating the bearing capacity of each support point. By changing the position of the pad and increasing or decreasing the support points, the load can be redistributed reasonably to reduce the load borne by the support at the settlement point. Then, the steel beam at the settlement point should be lifted up with a jack and re-padded with a steel plate. In addition, the settlement point should be reinforced and connected with the nearby supports to form an overall force.

[0048] In an embodiment of the present invention, the support columns 1036 are symmetrically arranged on both sides of the Bailey frame 1033. The bottom ends of the support columns 1036 are welded and fixed to the top of the second distribution beam 1032. The top ends of the support columns 1036 are flush with the bottom elevation of the steel box girder 100. After the steel box girder 100 is precisely docked, its bottom abuts against the top of the support columns 1036. The support columns 1036 are used for temporary support and fixation of the steel box girder 100, ensuring the stability of the connection of the steel box girder 100 and also facilitating the resetting and exit of the carrying trolley 104.

[0049] In an embodiment of the present invention, there are four wheels 1042, which are symmetrically arranged at the four corners of the bottom of the frame 1041. The wheels 1042 are all rollingly connected to the top of the track 1035, keeping the carrying trolley 104 moving stably along the laid track 1035, thereby realizing the adjustment of the longitudinal position of the steel box girder 100. The lifting platform 1043 is slidingly set on the top of the frame 1041. The lifting platform 1043 is convenient for adjusting the elevation position of the steel box girder 100. There are two telescopic machines 1045, which are symmetrically arranged on both sides of the lifting platform 1043. The movement direction of the output end of the telescopic machine 1045 is perpendicular to the movement direction of the carrying trolley 104. The output end of the telescopic machine 1045 is fixedly connected to the side of the lifting platform 1043. The telescopic machine 1045 pushes the lifting platform 1043 to move, thereby adjusting the lateral position of the steel box girder 100, and realizing the precise docking and installation of the three-way correction adjustment of the steel box girder 100 through the carrying trolley 104.

[0050] In an embodiment of the present invention, the lifting platform 1043 and the telescopic machine 1045 are both connected to a hydraulic controller. The lifting platform 1043 and the telescopic machine 1045 have a bearing capacity of 100T and are remotely controlled, which is simple and convenient to operate.

[0051] In an embodiment of the present invention, a drive motor 1044 is provided on one side of the frame 1041, and the output end of the drive motor 1044 is fixedly connected to the central axis of one of the wheels 1042. The drive motor 1044 is connected to a remote control controller for manually controlling the movement of the pack cart 104. A brake 1046 is provided on one side of the frame 1041, and the output end of the brake 1046 abuts against the top of the track 1035 when extended. When the steel box girder 100 is temporarily welded or not yet firmly fixed, the brake 1046 limits the pack cart 104 and the track 1035 to prevent the pack cart 104 from generating longitudinal displacement due to inertia.

[0052] In an embodiment of the present invention, matching pieces for butt connection are provided on both sides of the steel box beam 100 , and two adjacent groups of steel box beams 100 are welded and fixed by the matching pieces, which facilitate temporary connection of the steel box beams 100 .

[0053] Example 2

[0054] Refer to the attached Figure 6As shown, an embodiment of the present invention further provides a construction method of a precise installation system for steel main beam construction, comprising the following steps:

[0055] S1: Gantry crane 101 installation. Use a total station to position and lay out the lines. Based on the construction drawings, taking into account the site environment and construction space, the position of the gantry crane 101 foundation is positioned. The load-bearing beams and sliding rails of the gantry crane 101 are laid in sequence. The gantry crane 101 is then assembled, and the unloading area 1011 and the splicing area 1012 are distinguished.

[0056] S2, set up the assembly frame 102, drive the first steel pipe pile 1021 into the splicing area 1012 according to the design drawings, and weld the first distribution beam 1022 on the top of the first steel pipe pile 1021;

[0057] S3: Erect the packing frame 103, drive the second steel pipe pile 1031 according to the position and direction of the bridge in the design drawing, weld the second distribution beam 1032 on top of the second steel pipe pile 1031, then assemble the Bailey frame 1033 on top of the second distribution beam 1032 along the extension direction of the bridge, weld the track beam 1034 on top of the Bailey frame 1033, and then lay the track 1035 on top of the track beam 1034 along the extension direction of the bridge;

[0058] S4: Assembling and welding the steel box girder 100. The prefabricated beam segments are sequentially hoisted and placed on the assembly frame 102 by the gantry crane 101. A support saddle 1023 is placed at the bottom of the assembly frame to adjust the horizontal elevation of the steel box girder 100. Then, the longitudinal butt welding between the top / bottom plate units, the welding between the web and the top / bottom plate units, the welding between the diaphragm and the bottom plate / web, and the transverse butt welding of the diaphragm are sequentially performed. All welds are then subjected to ultrasonic testing for quality inspection.

[0059] S5, the steel box girder 100 is transported. During the assembly of the steel box girder 100, the transport trolley 104 is tested. After the assembly of the steel box girder 100 is completed, the transport trolley 104 is moved to the bottom of the steel box girder 100. The hydraulic controller pushes out the lifting platform 1043 to completely lift the steel box girder 100 and separate it from the supporting saddle 1023. The drive motor 1044 is started to transport the steel box girder 100 along the track 1035 to the predetermined position. The brake 1046 is then activated to secure the transport trolley 104.

[0060] S6: The steel box girder 100 is precisely positioned and its linear shape is adjusted using instrument measurements. The hydraulic controller controls the lifting platform 1043 to adjust the elevation of the steel box girder 100. The two telescopic machines 1045 are controlled to move the lifting platform 1043 laterally, adjusting the horizontal position of the steel box girder 100 so that it is precisely aligned with the previous section of the steel box girder 100. The matching parts are then connected and temporarily welded.

[0061] S7: The trolley 104 is withdrawn. After the temporary welding is completed, support columns 1036 are installed on both sides of the trolley 104, and their ends are welded to the second distribution beam 1032 and the bottom of the steel box beam 100 respectively. Then, the lifting platform 1043 is lowered to separate it from the bottom of the steel box beam 100. The brake 1046 is released and the drive motor 1044 is started to withdraw the trolley 104 from under the steel box beam 100 and prepare for the next round of consignment work.

[0062] S8, welding of the circumferential seam of the steel main beam, repeating steps S4-S7 until the closing section steel box beam 100 is in place and temporary welding is completed, and then permanent welding is performed from both sides of the bridge to the middle. After the welding of the steel main beam is completed, the temporarily welded components are cut off and polished to make them smooth.

[0063] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A precise installation system for steel main beam construction, applied to steel box beams (100), characterized in that: The invention comprises a gantry crane (101), an assembly frame (102), a carrying frame (103) and a carrying trolley (104); a plurality of steel box girders (100) are welded in sequence to form a bridge steel main girder; the gantry crane (101) is arranged on one side of the bridge bank; the assembly frame (102) is evenly arranged below the gantry crane (101); the assembly frame (102) is used for temporary support when the steel box girders (100) are assembled; the assembly frame (102) comprises a first steel pipe pile (1021), a first distribution beam (1022) and a supporting horse stool (1023); the steel box girders (100) are placed on the supporting horse stool (1023) when being assembled; the carrying frame (103) is provided in two groups and is arranged in parallel between the assembling frames (102); the carrying frame (103) The carrying frame (103) extends from the shore side close to the assembly frame (102) to the opposite bank along the extension direction of the bridge. The carrying frame (103) is used for transporting and supporting the steel box girder (100). The carrying frame (103) includes a second steel pipe pile (1031), a second distribution beam (1032), a track (1035) and a support column (1036). At least four carrying trolleys (104) are provided, and all are movably arranged above the track (1035). The carrying trolleys (104) include a frame (1041), wheels (1042), a lifting platform (1043) and a telescopic machine (1045). The top of the lifting platform (1043) is in contact with the bottom of the steel box girder (100). The carrying trolleys (104) are used for transporting and installing and adjusting the steel box girder (100).

2. A precise installation system for steel main beam construction according to claim 1, characterized in that: An unloading area (1011) and a splicing area (1012) are provided below the gantry crane (101). The unloading area (1011) is used for unloading and hoisting the split beam sections of the steel box beam (100), and the splicing area (1012) is used for splicing and forming the beam sections.

3. A precise installation system for steel main beam construction according to claim 1, characterized in that: The first steel pipe pile (1021) is vertically inserted into the shore base surface, the first distribution beam (1022) is horizontally arranged on the top of the first steel pipe pile (1021) and is welded and fixed to the first steel pipe pile (1021), and the supporting horse stool (1023) is arranged on the top of the first distribution beam (1022) and abuts against the bottom of the steel box beam (100).

4. A precise installation system for steel main beam construction according to claim 1, characterized in that: The second steel pipe pile (1031) is vertically inserted into the shore base ground and the riverbed, the second distribution beam (1032) is horizontally arranged on the top of the second steel pipe pile (1031) and is welded and fixed to the second steel pipe pile (1031), the top of the second distribution beam (1032) is fixedly connected to a Bailey frame (1033), the top of the Bailey frame (1033) is equidistantly provided with a track beam (1034), the track (1035) is fixedly connected to the top of the track beam (1034), and the track beam (1034) is perpendicular to the extension direction of the track (1035).

5. A precise installation system for steel main beam construction according to claim 4, characterized in that: The support columns (1036) are symmetrically arranged on both sides of the Bailey frame (1033), the bottom ends of the support columns (1036) are welded and fixed to the top of the second distribution beam (1032), the top ends of the support columns (1036) are flush with the bottom elevation of the steel box beam (100), and after the steel box beam (100) is precisely docked, its bottom abuts against the top of the support columns (1036).

6. The precise installation system for steel main beam construction according to claim 1, characterized in that: There are four wheels (1042) symmetrically arranged at the four bottom corners of the frame (1041), and the wheels (1042) are all rollingly connected to the top of the track (1035). The lifting platform (1043) is slidingly arranged on the top of the frame (1041). There are two telescopic machines (1045) symmetrically arranged on both sides of the lifting platform (1043). The movement direction of the output end of the telescopic machine (1045) is perpendicular to the moving direction of the carrying trolley (104), and the output end of the telescopic machine (1045) is fixedly connected to the side of the lifting platform (1043).

7. The precise installation system for steel main beam construction according to claim 1, characterized in that: The lifting platform (1043) and the telescopic machine (1045) are both connected to a hydraulic controller.

8. The precise installation system for steel main beam construction according to claim 1, characterized in that: A drive motor (1044) is provided on one side of the vehicle frame (1041), and an output end of the drive motor (1044) is fixedly connected to the central axis of one of the wheels (1042). A brake (1046) is provided on one side of the vehicle frame (1041), and an output end of the brake (1046) abuts against the top of the track (1035) when extended.

9. The precise installation system for steel main beam construction according to claim 1, characterized in that: Matching pieces for butting are provided on both sides of the steel box beam (100), and two adjacent groups of the steel box beams (100) are welded and fixed via the matching pieces.

10. A construction method for a precise installation system for steel main beam construction, applied to a precise installation system for steel main beam construction according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, gantry crane (101) installation, using a total station to position and lay out the lines, according to the construction drawings, taking into account the site environment and construction space, the position of the gantry crane (101) foundation is positioned, the load-bearing beams and sliding rails of the gantry crane (101) are laid in sequence, and then the gantry crane (101) is assembled, and the unloading area (1011) and the splicing area (1012) are distinguished; S2, setting up an assembly frame (102), driving a first steel pipe pile (1021) into the splicing area (1012) according to the design drawing, and welding a first distribution beam (1022) on top of the first steel pipe pile (1021); S3, erecting a packing frame (103), driving a second steel pipe pile (1031) according to the position and direction of the bridge in the design drawing, welding a second distribution beam (1032) on top of the second steel pipe pile (1031), then assembling a Bailey frame (1033) on top of the second distribution beam (1032) along the extension direction of the bridge, and simultaneously welding a track beam (1034) on top of the Bailey frame (1033), and then laying a track (1035) on top of the track beam (1034) along the extension direction of the bridge; S4, assembling and welding the steel box girder (100), hoisting the prefabricated beam segments in sequence through the gantry crane (101) and placing them on the assembly frame (102), and placing a supporting horse stool (1023) at the bottom of the assembly frame to adjust the horizontal elevation of the steel box girder (100), and then sequentially performing longitudinal butt welding between the top plate / bottom plate units, welding between the web and the top / bottom plate units, welding between the diaphragm and the bottom plate / web, and transverse butt welding of the diaphragm, and performing ultrasonic flaw detection quality inspection on all welds; S5, the steel box girder (100) is carried. During the assembly process of the steel box girder (100), the carrying trolley (104) is tested. After the assembly of the steel box girder (100) is completed, the carrying trolley (104) is moved to the bottom of the steel box girder (100). The lifting platform (1043) is pushed out through the hydraulic controller to completely lift the steel box girder (100) and separate it from the supporting horse stool (1023). The driving motor (1044) is started to carry the steel box girder (100) along the track (1035) to the predetermined position. The brake (1046) is started to fix the carrying trolley (104); S6, accurately positioning the steel box girder (100), adjusting the linear shape of the steel box girder (100) by measuring with instruments, controlling the lifting platform (1043) by a hydraulic controller to adjust the elevation of the steel box girder (100), controlling the two telescopic machines (1045) to cooperate, pushing the lifting platform (1043) to move laterally, adjusting the horizontal position of the steel box girder (100) so that it is accurately docked with the previous section of the steel box girder (100), and then connecting the matching parts and performing temporary welding; S7, the carrying trolley (104) is withdrawn. After the temporary welding is completed, support columns (1036) are installed on both sides of the carrying trolley (104), and the two ends thereof are welded and fixed to the second distribution beam (1032) and the bottom of the steel box beam (100), and then the lifting platform (1043) is lowered to separate it from the bottom of the steel box beam (100). The brake (1046) is released and the drive motor (1044) is started to withdraw the carrying trolley (104) from under the steel box beam (100) and prepare for the next round of consignment work; S8, welding of the steel main beam circumferential seam, repeating steps S4-S7 until the closing section steel box beam (100) is in place and temporary welding is completed, and permanent welding is performed from both sides of the bridge to the middle. After the welding of the steel main beam is completed, the temporary welded components are cut off and polished to be smooth.

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