CN115710862A - Steel girder construction accurate installation system and construction method - Google Patents

Abstract

The invention provides a steel girder construction accurate installation system and a construction method, belonging to the technical field of building construction, the system comprises steel box girders, a gantry crane, an assembling frame, a carrying frame and a carrying trolley, wherein a plurality of steel box girders are sequentially welded to form the bridge girder steel girder, the gantry crane is arranged on one side of a bridge shore foundation, the assembling frame is uniformly arranged below the gantry crane and comprises a first steel pipe pile, a first distribution beam and a support split heads, the carrying frame extends to an opposite shore from the side of the shore foundation close to the assembling frame along the extension direction of the bridge, the carrying frame comprises a second steel pipe pile, a second distribution beam, a track and a support column, the carrying trolley comprises a frame, wheels, a jacking platform and a telescopic machine, and the carrying trolley is used for transportation and installation adjustment of the steel box girders.

Description

Steel girder construction accurate installation system and construction method

Technical Field

The invention belongs to the technical field of building construction, and particularly relates to a steel girder construction accurate installation system and a construction method.

Background

With the development of national economy and transportation industry in China, higher requirements are put forward for urban bridge construction. The construction of the steel girder structure is an important link of bridge construction, and the installation and the construction are generally carried out by a hoisting method and a pushing method. The installation precision of the hoisting method is difficult to control, the requirement on the construction environment is high, and the space under the bridge needs clearance. The push method is a mainstream installation method of the steel box girder in the existing bridge engineering, has high construction safety factor and lower requirements on the working environment, and is easy to control the installation precision of the steel box girder.

The jacking method is a shifting method that a sliding table is placed on a track, a box girder piece is placed on the sliding table, the sliding table is pushed by a hydraulic oil cylinder, so that the sliding table slides on the track, a cantilever of the sliding table stretches out to connect with a pillar foundation on two sides, then the box girder piece is moved on the sliding table to be assembled, and in the process, the limitation of a cantilever bending moment is received.

Disclosure of Invention

The embodiment of the invention provides a steel girder construction accurate installation system and a construction method, which well utilize limited operation space, quickly and effectively simplify the construction process of steel box girder assembly, carrying and accurate positioning, reduce the construction difficulty, improve the construction efficiency, ensure the construction quality and save the construction cost.

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

the accurate installation system for steel girder construction comprises steel box girders, a gantry crane, an assembling frame, a packing frame and a packing trolley, wherein a plurality of steel box girders are sequentially welded to form the bridge steel girder, the gantry crane is arranged on one side of a bridge shore base, the assembling frame is uniformly arranged below the gantry crane and used for temporarily supporting the steel box girders during assembling, the assembling frame comprises first steel pipe piles, first distribution beams and support stools, the steel box girders are placed on the support stools during assembling, the packing frame is provided with two groups and arranged between the assembling frame in parallel, the packing frame extends to an opposite bank from one side of the shore base close to the assembling frame along the extension direction of the bridge, the packing frame is used for transportation support of the steel box girders, the packing frame comprises second steel pipe piles, second distribution beams, rails and support columns, at least four blocks are arranged and are arranged above the rails in a moving manner, the packing frame comprises abutting joints, wheels, telescopic blocks and jacking adjusting top portions of the steel box girders, and the jacking trolley are used for adjusting the top of the steel box girders and the steel box girders, and the jacking trolley.

As a preferred technical scheme of the invention, an unloading area and a splicing area are arranged below the gantry crane, the unloading area is used for unloading and hoisting the steel box girder split beam sections, and the splicing area is used for splicing and forming each beam section.

As a preferred technical solution of the present invention, the first steel pipe pile is vertically inserted into the shore-based ground, the first distribution beam is horizontally disposed on the top of the first steel pipe pile and is welded and fixed to the first steel pipe pile, and the support split heads are disposed on the top of the first distribution beam and abut against the bottom of the steel box girder.

As a preferred technical solution of the present invention, the second steel pipe pile is vertically inserted into a shore-based ground and a riverbed, the second distribution beam is horizontally disposed on the top of the second steel pipe pile and is welded and fixed to the second steel pipe pile, a beret frame is fixedly connected to the top of the second distribution beam, track beams are equidistantly disposed on the top of the beret frame, the tracks are fixedly connected to the top of the track beams, and the track beams are perpendicular to the extending direction of the tracks.

As a preferable technical solution of the present invention, the supporting columns are symmetrically disposed on two sides of the bailey frame, bottom ends of the supporting columns are welded and fixed to top portions of the second distribution beams, top ends of the supporting columns are flush with bottom elevations of the steel box beams, and after the steel box beams are precisely butted, bottom portions of the supporting columns abut against top portions of the supporting columns.

As a preferred technical scheme of the invention, four wheels are symmetrically arranged at four corners of the bottom of the frame, the wheels are all in rolling connection with the top of the track, the jacking table is slidably arranged at the top of the frame, two telescopic machines are symmetrically arranged at two sides of the jacking table, the motion direction of the output end of the telescopic machine is perpendicular to the moving direction of the carrying trolley, and the output end of the telescopic machine is fixedly connected with the side edge of the jacking table.

As a preferred technical scheme of the invention, the jacking table and the telescopic machine are both connected with a hydraulic controller.

As a preferable technical scheme of the invention, one side of the frame is provided with a driving motor, the output end of the driving motor is fixedly connected with the central shaft of one of the wheels, one side of the frame is provided with a brake, and the output end of the brake is abutted against the top of the track when extending out.

As a preferred technical scheme of the invention, matching pieces for butt joint are arranged on two sides of each steel box girder, and two adjacent groups of steel box girders are welded and fixed through the matching pieces.

On the other hand, the construction method of the steel girder construction accurate installation system comprises the following steps:

s1, installing a gantry crane, positioning and paying off by adopting a total station, paying off and positioning the position of a foundation of the gantry crane according to a construction drawing and considering a site environment and a construction space, laying a bearing beam and a sliding rail of the gantry crane in sequence, assembling the gantry crane, and distinguishing an unloading area and a splicing area;

s2, erecting a splicing frame, driving a first steel pipe pile into a splicing area according to a design drawing, and welding a first distribution beam at the top of the first steel pipe pile;

s3, erecting a carrying frame, driving a second steel pipe pile according to the position and the trend of the bridge in the design drawing, welding a second distribution beam on the top of the second steel pipe pile, assembling a Bailey frame on the top of the second distribution beam along the extension direction of the bridge, welding a track beam on the top of the Bailey frame, and paving a track on the top of the track beam along the extension direction of the bridge;

s4, splicing and welding the steel box girder, sequentially hoisting and placing the girder sections which are prefabricated in sections on a splicing frame through a gantry crane, placing a support split heads at the bottom of the girder sections to adjust the horizontal elevation of the steel box girder, sequentially performing longitudinal butt seam welding between top plate/bottom plate units, welding between a web plate and the top/bottom plate units, welding between a transverse partition plate and a bottom plate/web plate and transverse butt joint of the transverse partition plate, and performing ultrasonic flaw detection quality inspection on all welding seams;

s5, carrying the steel box girder, completing trial operation of the carrying trolley in the assembling process of the steel box girder, moving the carrying trolley to the bottom of the steel box girder after the assembling of the steel box girder is completed, ejecting the jacking table through a hydraulic controller to completely lift the steel box girder and separate the steel box girder from the supporting split heads, and starting a driving motor to carry the steel box girder to a preset position along a track;

s6, accurately positioning the steel box girder, adjusting the line shape of the steel box girder through instrument measurement, controlling the jacking table to adjust the elevation of the steel box girder through a hydraulic controller, controlling the two telescopic machines to be matched, pushing the jacking table to transversely move, adjusting the horizontal position of the steel box girder to enable the steel box girder to be accurately butted with the previous section of the steel box girder, and then connecting a matching piece and performing temporary welding;

s7, withdrawing the carrying trolley, after the temporary welding is finished, installing support columns at two sides of the carrying trolley, enabling two ends of the support columns to be respectively welded and fixed with the second distribution beam and the bottom of the steel box beam, then descending the jacking table to be separated from the bottom of the steel box beam, loosening a brake and starting a driving motor to withdraw the carrying trolley from the lower part of the steel box beam and prepare for next round of carrying work;

and S8, girth welding of the steel girder, repeating the steps S4-S7 until the steel box girder at the closure section is in place and the temporary welding is completed, permanently welding the middle of the two sides of the bridge, cutting off the temporarily welded components after the welding of the steel girder is completed, and polishing and flattening.

Compared with the prior art, the invention has the beneficial effects that:

(1) Hoisting the beam section components by utilizing the strong hoisting capacity of the gantry crane, and completing the assembly welding work of components such as a top plate, a web plate, a rib plate and the like on the assembly frame;

(2) The back and forth movement of the back-carrying trolley in the working space is realized by erecting the back-carrying frame and paving the sliding track, the back-carrying task of all the steel box beams is completed, the back-carrying frame is arranged below the bridge, other space is not occupied additionally, the running space of the back-carrying trolley is small, the operation space of the system is effectively saved, the application range is wide, and the popularization prospect is good;

(3) The position of the steel box girder is accurately adjusted by utilizing a power system and a jacking displacement system of the carrying trolley, the steel box girder is accurately butted under the assistance of a measuring instrument and workers, the operation is simple, the adjustment is convenient and fast, and the construction efficiency and the quality are effectively ensured;

(4) The support columns are arranged at the top of the carrying frame and used for temporarily supporting the steel box girder, so that the heavy load of the carrying trolley is released after the steel box girder is fixed, the carrying trolley can continue to carry out carrying work, and the working efficiency is improved.

The above description is only an overview of the technical solutions of the present invention, and the present invention can be implemented in accordance with the content of the description so as to make the technical means of the present invention more clearly understood, and the above and other objects, features, and advantages of the present invention will be more clearly understood.

Drawings

FIG. 1 is a schematic cross-sectional structural view of a shore base of a steel main beam construction accurate installation system disclosed by the invention;

FIG. 2 is a schematic cross-sectional structure view of a riverbed of a steel girder construction accurate installation system disclosed by the invention;

FIG. 3 is a schematic view of the piggyback car of the present invention;

FIG. 4 is a schematic top view of the piggyback car disclosed in the present invention;

FIG. 5 isbase:Sub>A cross-sectional view A-A of FIG. 3;

FIG. 6 is a schematic flow chart of a construction method of the steel girder construction precise installation system disclosed by the invention;

description of the reference numerals: 100. a steel box girder; 101. a gantry crane; 1011. an unloading area; 1012. a splicing region; 102. assembling the frame; 1021. a first steel pipe pile; 1022. a first distribution beam; 1023. a support split heads; 103. a carrying rack; 1031. a second steel pipe pile; 1032. a second distribution beam; 1033. a bailey frame; 1034. a track beam; 1035. a track; 1036. a support pillar; 104. carrying the trolley; 1041. a frame; 1042. a wheel; 1043. a jacking table; 1044. a drive motor; 1045. a stretching machine; 1046. a brake.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive efforts based on the embodiments of the present invention, are within the scope of protection of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

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

Example one

Referring to the attached drawings 1-5, the invention provides a technical scheme: an accurate installation system for steel girder construction comprises steel box girders 100, a gantry crane 101, an assembling frame 102, a carrying frame 103 and a carrying trolley 104, wherein a plurality of steel box girders 100 are sequentially welded to form a bridge steel girder, the steel box girders 100 are sequentially spliced from opposite banks to a bank base where the assembling frame is located along the bridge trend until being folded to form the steel girder, the gantry crane 101 is arranged on one side of the bridge bank base, the gantry crane 101 is provided with a supporting beam and a sliding way for hoisting the steel box girders 100, the assembling frame 102 is uniformly arranged below the gantry crane 101, the assembling frame 102 is used for temporary support when the steel box girders 100 are assembled, the assembling frame 102 comprises a first steel pipe pile 10231021, a first distribution beam 1022 and a supporting stool 1023, the steel box girders 100 are placed on the supporting stool when being assembled, the supporting stool 1023 is convenient for adjusting elevation when the steel box girders 100 are assembled, the quality of the steel box girders 100 is ensured, the carrying frame 103 is provided with two groups, the two-way steel box girder erection device is characterized in that the two-way steel box girder erection device is arranged between the erection frames 102 in parallel, the carrying frame 103 extends to the opposite bank from one side of a bank base close to the erection frames 102 along the extension direction of a bridge, the carrying frame 103 is used for transporting and supporting the steel box girders 100, meanwhile, after each steel box girder 100 is transported in place, the carrying frame 103 is used for temporarily supporting the steel main girders before the construction of a main tower of the bridge and a suspension guy is completed to ensure the stability of the steel main girders, the carrying frame 103 comprises a second steel pipe pile 1031, a second distribution beam 1032, a track 1035 and a support column 1036, the carrying trolley 104 is at least provided with four platforms and is uniformly arranged above the track 1035, the carrying trolley 104 comprises a frame 1041, wheels 1042, a jacking platform 1043 and a telescopic machine 1045, the top of the jacking platform 1043 is abutted against the bottom of the steel box girder 100, the carrying trolley 104 is used for transporting and installing and adjusting the steel box girder 100, the carrying trolley 104 moves the steel box girder 100 to the mounting position, the steel box girder 100 to adjust the elevation of the jacking platform 1043, the telescopic machine 1045 adjusts the horizontal position of the steel box girder 100, so that the steel box girder is accurately butted with the previous section of the steel box girder 100, the transportation is balanced, the three-dimensional adjustment can be realized, the automatic deviation correction is realized, and the construction quality and the construction efficiency are improved.

In the embodiment of the invention, an unloading area 1011 and a splicing area 1012 are arranged below a gantry crane 101, the unloading area 1011 is used for unloading and hoisting of split beam sections of a steel box beam 100, the splicing area 1012 is used for splicing and forming of the beam sections, the steel box beam 100 is divided into the beam sections according to a stress structure and is prefabricated in a factory due to the fact that the cross section of the steel box beam 100 is large, the unloading area 1011 facilitates unloading and hoisting of the beam sections after being transported to the site, the splicing area 1012 corresponds to a splicing frame, and the hoisted beam sections are placed on the splicing frame according to positions for splicing and assembling.

In the embodiment of the invention, the first steel pipe pile 1021 is vertically inserted into the shore foundation ground, the first distribution beam 1022 is horizontally arranged at the top of the first steel pipe pile 1021 and is welded and fixed with the first steel pipe pile 1021, the support stool 1023 is arranged at the top of the first distribution beam 1022 and is abutted against the bottom of the steel box girder 100, the first distribution beam 1022 distributes the gravity of the steel box girder 100 to the first steel pipe pile 1021, so that the spliced frame load is larger, the first steel pipe pile 1021 adopts phi 426mm multiplied by 8mm spiral steel pipes, and the first distribution beam 1022 adopts 45a # I-steel.

In the embodiment of the present invention, a second steel pipe pile 1031 is vertically inserted into the shore-based ground and the river bed, a second distribution beam 1032 is horizontally disposed on the top of the second steel pipe pile 1031 and is welded and fixed with the second steel pipe pile 1031, the second distribution beam 1032 distributes the load on the carrying rack 103 to the second steel pipe pile 1031, so that the carrying rack 103 is stressed more uniformly, a berey frame 1033 is fixedly connected to the top of the second distribution beam 1032, a track beam 1034 is equidistantly disposed on the top of the berey frame 1033, the track 1035 is fixedly connected to the top of the track beam 1034, the track beam 1034 is perpendicular to the extending direction of the track 1035, the track beam 1034 further uniformly transfers the load on the track 1035 to the berey frame 1033, the berey frame 1033 has a large bearing capacity and strong structural rigidity, the connection is convenient, the transportation of the track 1035 is kept stable, the second steel pipe pile 1031 adopts a spiral steel pipe with a diameter of 630mm × 8mm, the standard spacing is 9m, the local maximum spacing is not more than 12m, and the second beam 1032 adopts # i-steel # steel.

The settlement monitoring of the support is carried out throughout the whole construction process, the arch degree value raised by the support operation pad can be obtained through monitoring data, if the support is partially settled more than expected in the construction process or system conversion, the construction is immediately suspended, the analysis on the settlement reason is carried out, whether each supporting point is operated or not is carefully checked, the local tubular pile is prevented from being stressed too much due to unbalance loading, the settlement of the local point can be calculated by adopting the bearing capacity of each supporting point, the effect of reasonably distributing the load again is achieved by changing the operation pad position and increasing and decreasing the supporting points, so that the load borne by the support at the settlement point is reduced, then the steel beam at the settlement point is jacked up by using a jack, the pad is operated firmly again by using a steel plate, and in addition, the settlement point and the nearby supports are connected in a reinforcing mode, so that the whole stress is formed.

In the embodiment of the present invention, the supporting columns 1036 are symmetrically disposed on two sides of the bailey frames 1033, bottom ends of the supporting columns 1036 are welded and fixed to top portions of the second distribution beams 1032, top ends of the supporting columns 1036 are aligned with an elevation of a bottom portion of the steel box girder 100, after the steel box girder 100 is precisely butted, the bottom portion of the steel box girder is abutted against the top portions of the supporting columns 1036, and the supporting columns 1036 are used for temporarily supporting and fixing the steel box girder 100, so as to ensure connection stability of the steel box girder 100, and facilitate resetting and exiting of the carrying cart 104.

In the embodiment of the present invention, four wheels 1042 are symmetrically arranged at four corners of the bottom of the frame 1041, the wheels 1042 are all in rolling connection with the top of the rail 1035 to keep the carrying trolley 104 stably moving along the laid rail 1035 to realize the adjustment of the longitudinal position of the steel box girder 100, the jacking table 1043 is slidably arranged at the top of the frame 1041, the jacking table 1043 facilitates the adjustment of the elevation position of the steel box girder 100, two telescopic machines 1045 are symmetrically arranged at two sides of the jacking table 1043, the moving direction of the output end of the telescopic machine 1045 is perpendicular to the moving direction of the carrying trolley 104, the output end of the telescopic machine 1045 is fixedly connected with the side edge of the jacking table 1043, the telescopic machine 1045 pushes the jacking table 1043 to move, so as to adjust the transverse position of the steel box girder 100, and the accurate butt joint installation of the three-way deviation rectification adjustment of the steel box girder 100 is realized by the carrying trolley 104.

In the embodiment of the present invention, both the jacking table 1043 and the telescoping machine 1045 are connected to a hydraulic controller, the bearing capacity of the jacking table 1043 and the telescoping machine 1045 is 100T, and the operation is simple and convenient by adopting remote control.

In the embodiment of the present invention, a driving motor 1044 is disposed on one side of the frame 1041, an output end of the driving motor 1044 is fixedly connected to a central shaft of one of the wheels 1042, the driving motor 1044 is connected to a remote controller for manually controlling the movement of the carrying trolley 104, a brake 1046 is disposed on one side of the frame 1041, an output end of the brake 1046 abuts against a top of the rail 1035 when extending out, and the brake 1046 limits the carrying trolley 104 and the rail 1035 when the steel box girder 100 is temporarily welded or is not fixed firmly, so as to prevent the carrying trolley 104 from generating longitudinal displacement due to inertia.

In the embodiment of the invention, matching pieces for butt joint are arranged on both sides of the steel box girder 100, and two adjacent groups of steel box girders 100 are welded and fixed through the matching pieces, which are convenient for temporary connection of the steel box girders 100.

Example two

Referring to fig. 6, another construction method for a steel girder construction precision installation system according to an embodiment of the present invention includes the following steps:

s1, installing a gantry crane 101, positioning and paying off by adopting a total station, paying off and positioning the position of a foundation of the gantry crane 101 according to a construction drawing by considering a site environment and a construction space, laying a bearing beam and a sliding rail of the gantry crane 101 in sequence, assembling the gantry crane 101, and distinguishing an unloading area 1011 and a splicing area 1012;

s2, erecting the assembly frame 102, driving a first steel pipe pile 1021 in the splicing area 1012 according to a design drawing, and welding a first distribution beam 1022 at the top of the first steel pipe pile 1021;

s3, erecting a carrying frame 103, driving a second steel pipe pile 1031 according to the position and the direction of the bridge in the design drawing, welding a second distribution beam 1032 on the top of the second steel pipe pile 1031, assembling a Bailey frame 1033 on the top of the second distribution beam 1032 in the extending direction of the bridge, welding a track beam 1034 on the top of the Bailey frame 1033, and laying a track 1035 on the top of the track beam 1034 in the extending direction of the bridge;

s4, assembling and welding the steel box girder 100, sequentially hoisting and placing the beam sections which are prefabricated in sections on an assembling frame 102 through a gantry crane 101, placing a support stool 1023 at the bottom of the beam sections to adjust the horizontal elevation of the steel box girder 100, sequentially performing longitudinal butt seam welding between a top plate unit and a bottom plate unit, welding between a web plate and the top plate unit, welding between a transverse partition plate and a bottom plate/web plate, transversely butting the transverse partition plate, and performing ultrasonic flaw detection quality inspection on all welding seams;

s5, carrying the steel box girder 100, completing trial operation of the carrying trolley 104 in the assembling process of the steel box girder 100, moving the carrying trolley 104 to the bottom of the steel box girder 100 after the assembling of the steel box girder 100 is completed, ejecting the jacking table 1043 through a hydraulic controller to completely lift the steel box girder 100 and separate the steel box girder from the support stool 1023, starting a driving motor 1044 to carry the steel box girder 100 to a preset position along a track 1035, and starting a brake 1046 to fix the carrying trolley 104;

s6, accurately positioning the steel box girder 100, adjusting the line shape of the steel box girder 100 through instrument measurement, controlling the jacking table 1043 to adjust the elevation of the steel box girder 100 through a hydraulic controller, controlling the two telescopic machines 1045 to be matched, pushing the jacking table 1043 to transversely move, adjusting the horizontal position of the steel box girder 100 to enable the steel box girder to be accurately butted with the previous section of the steel box girder 100, and then connecting a matching piece and performing temporary welding;

s7, the carrying trolley 104 is withdrawn, after the temporary welding is finished, supporting columns 1036 are installed on two sides of the carrying trolley 104, two ends of the supporting columns 1036 are respectively welded and fixed with the second distribution beam 1032 and the bottom of the steel box beam 100, then the jacking table 1043 is lowered to be separated from the bottom of the steel box beam 100, the brake 1046 is loosened, the driving motor 1044 is started, the carrying trolley 104 is withdrawn from the lower portion of the steel box beam 100, and the next round of carrying work is prepared;

s8, girth welding of the steel girder, repeating the steps S4-S7 until the steel box girder 100 at the closure section is in place and the temporary welding is completed, permanently welding the middle of the two sides of the bridge, cutting off the temporarily welded components after the welding of the steel girder is completed, and polishing and flattening _。

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The accurate installation system for the steel girder construction is characterized by comprising steel box girders (100), a gantry crane (101), an assembling frame (102), a carrying frame (103) and a carrying trolley (104), wherein the steel box girders (100) are sequentially welded to form the bridge girder steel girder, the gantry crane (101) is arranged on one side of a bridge shore foundation, the assembling frame (102) is uniformly arranged below the gantry crane (101), the assembling frame (102) is used for temporarily supporting the steel box girders (100) during assembling, the assembling frame (102) comprises a first steel pipe pile (1021), a first distribution beam (1023) and a supporting horse stool (1023), the steel box girders (100) are placed on the supporting horse stool (1022) during assembling, the two groups of the pack-carrying frames (103) are arranged between the assembling frames (102) in parallel, the pack-carrying frames (103) extend to opposite banks from one side of a bank base close to the assembling frames (102) along the extension direction of a bridge, the pack-carrying frames (103) are used for transporting and supporting the steel box girders (100), the pack-carrying frames (103) comprise second steel pipe piles (1031), second distribution beams (1032), rails (1035) and support columns (1036), at least four pack-carrying trolleys (104) are arranged and are all movably arranged above the rails (1035), and each pack-carrying trolley (104) comprises a frame (1041), the steel box girder comprises wheels (1042), a jacking table (1043) and a telescopic machine (1045), wherein the top of the jacking table (1043) is abutted to the bottom of the steel box girder (100), and the carrying trolley (104) is used for transporting, installing and adjusting the steel box girder (100).

2. The steel girder construction accurate installation system according to claim 1, wherein an unloading area (1011) and a splicing area (1012) are arranged below the gantry crane (101), the unloading area (1011) is used for unloading and hoisting of the split beam sections of the steel box girder (100), and the splicing area (1012) is used for splicing and forming of each beam section.

3. The accurate installation system of a steel girder construction according to claim 1, wherein the first steel pipe pile (1021) is vertically inserted into a shore foundation ground, the first distribution beam (1022) is horizontally arranged on the top of the first steel pipe pile (1021) and is welded and fixed with the first steel pipe pile (1021), and the support horse stool (1023) is arranged on the top of the first distribution beam (1022) and abuts against the bottom of the steel box girder (100).

4. The accurate installation system for steel girder construction according to claim 1, wherein the second steel pipe pile (1031) is vertically inserted into a shore-based ground and a riverbed, the second distribution beam (1032) is horizontally arranged on the top of the second steel pipe pile (1031) and is welded and fixed with the second steel pipe pile (1031), a berey frame (1033) is fixedly connected to the top of the second distribution beam (1032), track beams (1034) are equidistantly arranged on the top of the berey frame (1033), the track (1035) is fixedly connected to the top of the track beam (1034), and the track beam (1034) is perpendicular to the extending direction of the track (1035).

5. The accurate installation system of a steel girder construction according to claim 4, wherein the supporting columns (1036) are symmetrically arranged at two sides of the Bailey frames (1033), the bottom ends of the supporting columns (1036) are welded and fixed with the top portions of the second distribution beams (1032), the top ends of the supporting columns (1036) are level with the bottom elevations of the steel box girders (100), and the bottom portions of the steel box girders (100) abut against the top portions of the supporting columns (1036) after accurate butt joint.

6. The accurate installation system of a steel girder construction of claim 1, wherein the wheels (1042) are four and symmetrically arranged at four corners of the bottom of the frame (1041), the wheels (1042) are all connected with the top of the rail (1035) in a rolling manner, the jacking table (1043) is slidably arranged at the top of the frame (1041), the number of the telescopic machines (1045) is two and symmetrically arranged at two sides of the jacking table (1043), the moving 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 with the side edge of the jacking table (1043).

7. The steel girder construction precision installation system of claim 1, wherein the jacking table (1043) and the telescopic machine (1045) are connected with hydraulic controllers.

8. The accurate installation system for steel girder construction according to claim 1, wherein a driving motor (1044) is arranged on one side of the frame (1041), an output end of the driving motor (1044) is fixedly connected with a central shaft of one of the wheels (1042), a brake (1046) is arranged on one side of the frame (1041), and an output end of the brake (1046) abuts against a top of the rail (1035) when extending out.

9. The accurate installation system for steel girder construction according to claim 1, wherein matching pieces for butt joint are arranged on both sides of the steel box girders (100), and two adjacent groups of the steel box girders (100) are welded and fixed through the matching pieces.

10. A construction method of a steel girder construction accurate installation system is applied to the steel girder construction accurate installation system of any one of claims 1 to 9, and is characterized by comprising the following steps:

s1, installing a gantry crane (101), positioning and paying off by adopting a total station, paying off and positioning the position of a foundation of the gantry crane (101) by considering a site environment and a construction space according to a construction drawing, sequentially paving a bearing beam and a sliding rail of the gantry crane (101), assembling the gantry crane (101), and distinguishing an unloading area (1011) and a splicing area (1012);

s2, erecting a splicing frame (102), driving a first steel pipe pile (1021) in a splicing area (1012) according to a design drawing, and welding a first distribution beam (1022) at the top of the first steel pipe pile (1021);

s3, erecting a carrying frame (103), driving a second steel pipe pile (1031) according to the position and the trend of the bridge according to a design drawing, welding a second distribution beam (1032) on the top of the second steel pipe pile (1031), assembling a Bailey frame (1033) on the top of the second distribution beam (1032) along the extending direction of the bridge, welding a track beam (1034) on the top of the Bailey frame (1033), and paving a track (1035) on the top of the track beam (1034) along the extending direction of the bridge;

s4, assembling and welding the steel box girder (100), sequentially hoisting and placing the girder sections which are prefabricated in sections on an assembling frame (102) through a gantry crane (101), placing a support split heads (1023) at the bottom of the girder sections to adjust the horizontal elevation of the steel box girder (100), then sequentially carrying out longitudinal butt joint welding between top plate/bottom plate units, welding between a web plate and the top plate/bottom plate units, welding between a diaphragm plate and a bottom plate/web plate and transversely butting the diaphragm plate, and carrying out ultrasonic flaw detection quality inspection on all welding seams;

s5, carrying the steel box girder (100), completing trial operation of a carrying trolley (104) in the assembly process of the steel box girder (100), moving the carrying trolley (104) to the bottom of the steel box girder (100) after the assembly of the steel box girder (100) is completed, ejecting a jacking table (1043) through a hydraulic controller to enable the jacking table to completely lift the steel box girder (100) and separate the jacking table from a support stool (1023), starting a driving motor (1044) to carry the steel box girder (100) to a preset position along a track (1035), and starting a brake (1046) to fix the carrying trolley (104);

s6, accurately positioning the steel box girder (100), adjusting the linear shape of the steel box girder (100) through instrument measurement, controlling a jacking table (1043) to adjust the elevation of the steel box girder (100) through a hydraulic controller, controlling two telescopic machines (1045) to be matched, pushing the jacking table (1043) to transversely move, adjusting the horizontal position of the steel box girder (100) to enable the horizontal position to be accurately butted with the previous section of the steel box girder (100), and then connecting a matching piece and carrying out temporary welding;

s7, withdrawing the carrying trolley (104), after the temporary welding is finished, installing support columns (1036) at two sides of the carrying trolley (104), enabling two ends of the support columns to be fixedly welded with the second distribution beam (1032) and the bottom of the steel box beam (100) respectively, then lowering the jacking table (1043), enabling the jacking table to be separated from the bottom of the steel box beam (100), loosening the brake (1046) and starting the driving motor (1044) to withdraw the carrying trolley (104) from the lower side of the steel box beam (100) and prepare for next wheel carrying work;

and S8, performing girth welding on the steel girder, repeating the steps S4-S7 until the steel box girder (100) at the closure section is in place and the temporary welding is completed, performing permanent welding from the two sides to the middle of the bridge, cutting off the temporarily welded component after the welding of the steel girder is completed, and polishing and flattening.

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