Method for precise in-situ assembly of thick steel plate steel box girder

Abstract

The present application relates to a kind of thick steel plate steel box girder accurate in situ assembly construction method, through column interconnecting bolt, oblique support bolt, plate top limiting groove and column bottom dense body fixed support stand column;Through top plate slot, connecting support pier and platform inclined bracing fixed platform top plate;Through side plate positioning bolt and positioning top bolt, position steel box side plate;Combination is used to connect sling and position air bag and is carried out steel box partition plate hoisting guide;Using sliding welding device, plate bottom weld sliding welding construction is carried out;Using position bolt rib and position support pier, the inclination angle of box girder plate section is adjusted, the welding angle of protective side plate and top plate welding machine is controlled by angle bolt and side plate hinge control, under the action of external force, mobile platform and top plate welding machine move along mobile sliding groove;First position bolt and wing plate clamping groove are set on the first support plate, and steel box wing plate section can be positioned by second position bolt, third position bolt and fourth position bolt.The present application can improve the accuracy of steel box girder steel plate welding positioning, and improve the integrity of support.

Description

Technical Field

[0001] The present invention relates to a precise in-situ assembly construction method for thick steel plate steel box girders, which can improve the installation and positioning accuracy of steel box girder panels and reduce the difficulty of panel welding construction. The method is suitable for on-site steel box girder construction projects. Background Art

[0002] Steel box girder construction can generally be divided into two construction methods: segmental prefabrication and on-site in-situ assembly. In the construction of large-span steel box girders, especially those in curved sections, in-situ assembly is often used to improve the accuracy of bridge alignment. During in-situ assembly of steel box girders, reducing the difficulty of steel plate hoisting and positioning, improving the quality of steel plate welding, and improving the accuracy of the connection between the steel box girder and the flange have always been key and difficult issues in on-site engineering control.

[0003] Among the existing construction technologies, there is a method for in-situ loose assembly and hoisting of steel box girders. The hoisting of the steel box girders is assisted by a gantry crane and an assembly bracket, which effectively reduces the site occupation area; the horizontal limit device can effectively prevent the bottom plate unit from sliding, reducing the size of the butt weld; the steel box girder is divided into multiple units such as the bottom plate, transverse diaphragm, web, top plate and cantilever for manufacturing. Although this technology can meet the needs of bottom connection of the steel plate and on-site hoisting, it is difficult to simultaneously achieve vertical anti-deviability of the steel plate, rigid-flexible combined guidance control and horizontal and vertical joint tightness control, symmetrical sliding welding of the steel plate on both sides to improve welding quality, etc. during the steel plate hoisting process.

[0004] In view of this, in order to improve the in-situ assembly construction quality of thick steel plate steel box girders, it is urgent to invent a precise in-situ assembly construction method for thick steel plate steel box girders that can improve the accuracy of steel box girder steel plate welding positioning, improve the integrity of the bracket, and improve construction efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for accurately assembling thick steel plate box girders in situ, which can not only improve the accuracy of steel box girder steel plate welding positioning, but also improve the integrity of the bracket and improve construction efficiency.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] The construction method for precise in-situ assembly of thick steel plate steel box girders includes the following construction steps:

[0008] 1) Construction preparation: Review and calculate the dimensions of the support columns; calculate and determine the spatial positions of the steel box flange sections and box beam sections, and fabricate the steel box bottom plate, steel box side plates, steel box partitions, and steel box top plates of the box beam sections in advance;

[0009] 2) Assembly of prefabricated supports: The prefabricated supports include a support base plate, support columns, and a support top plate. Insert the bottom end of the support column into the plate top limit groove on the upper surface of the support base plate, and fill the gap between the support column and the plate top limit groove with a column bottom compact. Install a column clamp around the periphery of the support column, and set a clamp side connection groove on the side wall of the column clamp. Install inter-column connecting bolts between the clamp side connection grooves of adjacent support columns, and install an oblique support bolt between the outermost column clamp and the support base plate. Install a support top plate at the top of the support column. Install an adjustment bolt in the middle of the support top plate.

[0010] 3) Installation of steel box side panels: Place the steel box bottom panel on the upper surface of the supporting bottom beam, and place the supporting bottom beam on the upper end of the adjusting bolts on the bracket top panel, and adjust the horizontality of the steel box bottom panel by adjusting the bolts and the bottom panel support piers; set a vertical support panel on the upper surface of the bracket top panel, and sequentially set a side panel positioning bolt and a magnetic component on the side of the vertical support panel facing the steel box bottom panel, with one end of the side panel positioning bolt fixedly connected to the vertical support panel and the other end connected to the magnetic component; set a top limit groove at the top end of the vertical support panel, and set a positioning top bolt on the groove wall of the top limit groove; use external lifting equipment to lift the steel box side panel to the steel box bottom panel, with the upper end of the steel box side panel extending into the top limit groove, and simultaneously use the side panel positioning bolt and positioning top bolt to control the verticality and lateral position of the steel box side panel, and weld the steel box side panel to the steel box bottom panel;

[0011] 4) Installation of steel box partitions: Install diagonal bracing ribs on the steel box bottom plate, with the two diagonal bracing ribs symmetrically arranged. Install a positioning airbag at the end of the diagonal bracing rib facing the steel box partition, and adhere rigid side panels to both sides of the positioning airbag, with one side panel fixedly connected to the end of the diagonal bracing rib. Install elastic return ribs between the rigid side panels on both sides of the positioning airbag. Install a positioning air pump on the diagonal bracing rib, and connect the positioning air pump and the positioning airbag via a pipe. Lift the steel box partition onto the steel box bottom plate, positioning it between the two diagonal bracing ribs. Adjust the verticality of the steel box partition using the positioning airbags. Install two symmetrical sliding welding devices on the steel box bottom plate on both sides of the steel box partition. Weld the steel box partition to the steel box bottom plate using the sliding welding devices.

[0012] 5) Installation of steel box top plate: weld limit frame beams at both ends of the supporting bottom beam, connect the limit frame beams with pressure bolts, set fastening bags on the side of the limit frame beam facing the steel box bottom plate, and simultaneously apply fastening force to the steel box side plates through the fastening bags and pressure bolts on the limit frame beams; place the inner frame bottom plate on the steel box bottom plate, and set inner frame support columns and inner frame slides on the upper surface of the steel box bottom plate in sequence; set roller supports on the side of the inner frame support columns facing the steel box side plates, and set side plate rollers between the roller supports and the steel box side plates; place adjustment support piers between the supporting bottom beam and the bracket top plate, and install a support pier on the bracket top plate close to the adjustment support pier. One end of the support pier is connected to the support pier positioning bolt, and one end of the support pier positioning bolt is against the side of the adjustment support pier; the steel box top plate is hoisted to the upper end of the steel box side plate; the inclination angle of the supporting bottom beam is adjusted by adjusting the bolt reinforcement, the support pier positioning bolt and the adjustment support pier, and then the movable table is installed above the inner frame slide, so that the bottom connection of the movable table is connected to the movable slide groove on the inner frame slide; a top plate welder is installed on the movable table, and the inclination angle of the top plate welder is adjusted. Then, the top plate welder is used to construct the top plate weld seam, and the top plate welder and the movable table are simultaneously moved along the inner frame slide to weld and fix the steel box top plate and the steel box side plate;

[0013] 6) Connect and position the steel box flange section with the box beam section: weld the first support plate to the outer side wall of the steel box side plate of the box beam section, weld the first alignment bolt on the upper surface of the first support plate, and weld the flange slot at the upper end of the first alignment bolt; hang the steel box flange section on the flange slot, and adjust the height of the steel box flange section by the first alignment bolt; weld the fourth and sixth support plates on the upper surface of the steel box flange section, and weld a "U"-shaped support plate connecting reinforcement on the side of the fourth support plate facing the box beam section; weld the fifth, seventh and second support plates on the box beam section. A third support plate is welded to the side of the second support plate facing the steel box wing plate section, and oblique support bars are set between the third support plate and the second support plate; a second positioning bolt is set between the fifth support plate and the support plate connecting bar, a fourth positioning bolt is set between the sixth support plate and the seventh support plate, and a third positioning bolt is welded between the third support plate and the steel box wing plate section; the transverse relative position of the steel box wing plate section and the box beam plate section is controlled by the second positioning bolt, the vertical relative position of the steel box wing plate section is controlled by the third positioning bolt, and the oblique position of the steel box wing plate section and the box beam plate section is controlled by the fourth positioning bolt.

[0014] Preferably, in step 3), the side panel positioning bolt includes a screw and a nut, the two screws are threadedly connected to the two sides of the nut, and the tightening directions of the screws on both sides of the nut are opposite; one end of the side panel positioning bolt is welded to the vertical support plate; the magnetic component adopts an electromagnetic suction cup.

[0015] Preferably, in step 4), the sliding welding device includes a welding machine support plate, a first guide plate, a second guide plate and a first welder, the first guide plate and the second guide plate are respectively arranged at both ends of the welding machine support plate, and the first guide plate and the second guide plate at both ends of the welding machine support plate are respectively connected to the guide plate limiting grooves on the steel box partition and the steel box bottom plate, the guide plate limiting grooves are arranged along the length direction of the joint between the steel box partition and the steel box bottom plate, the first welder is installed on the welding machine support plate and is opposite to the joint between the steel box partition and the steel box bottom plate; the first welder is moved along the guide plate limiting grooves under the action of external force to perform welding construction of the bottom plate weld.

[0016] Preferably, a first roller is provided at the junction of the first guide plate and the steel box partition, and a second roller is provided at the junction of the second guide plate and the steel box bottom plate; the guide plate limit groove is made of rolled steel plate and has an "L"-shaped cross section.

[0017] Preferably, in step 4), when the steel box partition is hoisted, connecting lifting rings are respectively provided on both side walls of the steel box partition, and the steel box partition is connected to the positioning reel on the conversion beam through the connecting lifting rings and the connecting lifting ropes; a vertical positioning control body is provided between the upper end of the steel box partition and the conversion beam, and the conversion beam is connected to the external lifting equipment through the lifting rope; the vertical positioning control body adopts a hydraulic jack.

[0018] Preferably, in step 5), a protective side panel is connected to the movable table, the protective side panel is hinged to the movable table via a side panel hinge, an angle adjustment bolt is provided between the protective side panel and the movable table, and the top plate welder is mounted on the protective side panel; the angle of the protective side panel and the top plate welder is adjusted via the angle adjustment bolt.

[0019] Preferably, in step 5), the cross section of the adjustment support pier is a right-angled trapezoid, and one end of the support pier positioning bolt supports the side surface of the adjustment support pier; the adjustment support pier is pushed by the support pier positioning bolt to drive the adjustment support pier to move, thereby adjusting the inclination angle of the supporting bottom beam.

[0020] Preferably, in step 5), the first positioning bolt, the second positioning bolt, the third positioning bolt and the fourth positioning bolt all include nuts and screws, the two screws are threadedly connected to the two sides of the nut, and the tightening directions of the screws on both sides of the nut are opposite, and the two ends of the first positioning bolt are respectively welded to the first support plate and the wing plate slot, the second positioning bolt is welded to the fifth support plate, and the fourth positioning bolt is welded to the seventh support plate.

[0021] The present invention has the following characteristics and beneficial effects

[0022] (1) Length-adjustable inter-column connecting bolts are set between the support columns, length-adjustable diagonal support bolts are set on the outside of the support columns, and plate top limit grooves and column bottom compacts are set at the bottom ends of the support columns, which can realize the rapid connection and fixation of the support columns; at the same time, one end of the platform top plate is inserted into the top slot on the support top plate, and the lower surface is connected to the connecting support pier and the platform diagonal support, which improves the layout efficiency of the platform top plate.

[0023] (2) A vertical external support is welded on the upper surface of the bracket top plate, and side plate positioning bolts and top limit grooves are sequentially arranged on the side of the vertical external support facing the steel box side plate. The lower part of the steel box side plate can be positioned by the side plate positioning bolts and magnetic components, and the upper part of the steel box side plate can be positioned by the positioning top bolts, thereby improving the positioning accuracy of the steel box side plate.

[0024] (3) The combination uses connecting slings on both sides of the steel box partition to perform top lifting and tilting control, and uses positioning airbags to guide the lifting and tilt control in the middle. The vertical positioning body assists in controlling the gap between the steel box partition and the steel box bottom plate, thereby achieving accurate lifting of the steel box partition; at the same time, a set of sliding welding devices are set on both sides of the steel box partition to be welded, which can realize guided sliding welding of the steel plate weld.

[0025] (4) The tilt angle of the box beam section is adjusted by using adjustable bolts and adjustable support piers, which reduces the difficulty of overhead welding construction. At the same time, the welding angles of the protective side panels and top plate welding machines are controlled by adjusting angle bolts and side plate hinges, and the mobile table and top plate welding machine can be moved along the table slide under the action of external force, which reduces the difficulty of top plate weld construction.

[0026] (5) The first alignment bolt and the wing plate slot are set on the first support plate to preliminarily position the steel box wing plate segment stiffener; the second alignment bolt, the third alignment bolt and the fourth alignment bolt can be used to accurately control the horizontal position, vertical position and oblique position of the steel box wing plate segment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a construction flow chart for the precise in-situ assembly of thick steel plate steel box girders according to the present invention;

[0028] Figure 2 yes Figure 1 Schematic diagram of the assembly construction structure of steel box side panels and steel box partitions;

[0029] Figure 3 yes Figure 2 Schematic diagram of the structure of the mid-slip welding device;

[0030] Figure 4 yes Figure 1 Schematic diagram of steel box top plate welding construction structure;

[0031] Figure 5 yes Figure 1Cross-sectional view of the connection and positioning structure between the steel box flange section and the box beam section;

[0032] Figure 6 yes Figure 1 Top view of the connection and positioning structure between the steel box wing plate section and the box beam plate section.

[0033] In the figure: 1-support column; 2-steel box wing plate section; 3-box beam plate section; 4-steel box bottom plate; 5-steel box side plate; 6-steel box partition; 7-steel box top plate; 8-support bottom plate; 9-support top plate; 10-platform top plate; 11-plate top limit groove; 12-column bottom dense body; 13-foundation soil; 14-support roller; 15-column clamp; 16-hoop side connecting groove; 17-column connecting bolt; 18-oblique support bolt; 19-top plate slot; 20-adjusting bolt bar; 21-support pier limit groove; 22-platform oblique support; 23-connecting support pier; 24-support bolt end hinge; 25-support bottom beam; 26-bottom plate support pier; 27-vertical support plate; 28-side plate positioning bolt; 29-magnetic part 30-top limit slot; 31-positioning top bolt; 32-connecting lifting ring; 33-connecting sling; 34-converting lifting beam; 35-positioning winding machine; 36-vertical position control body; 37-lifting rope; 38-supporting diagonal reinforcement; 39-positioning airbag; 40-rigid side plate; 41-elastic return reinforcement; 42-air pump support plate; 43-calibration air pump; 44-sliding welding device; 45-connecting hinge; 46-first guide plate; 47-second guide plate; 48-guide Plate limiting groove; 49-welding machine support plate; 50-first welding machine; 51-bottom plate weld; 52-first roller; 53-second roller; 54-limiting frame beam; 55-fastening bag; 56-top pressure bolt; 57-inner frame bottom plate; 58-inner frame support column; 59-roller support frame; 60-side plate roller; 61-position adjustment support pier; 62-movable table; 63-bottom plate connecting falcon; 65-angle adjustment bolt; 66-top plate welder; 67-top plate weld; 68-protective side Plate; 69-side plate hinge; 70-first support plate; 71-first alignment bolt; 72-wing plate slot; 73-fourth support plate; 74-sixth support plate; 75-fifth support plate; 76-seventh support plate; 77-second support plate; 78-third support plate; 79-diagonal support bar; 80-support plate connecting bar; 81-second alignment bolt; 82-fourth alignment bolt; 83-third alignment bolt; 84-inner frame slide (84); 85-safety barrier; 86-support pier positioning bolt. Specific embodiments

[0035] The technical requirements for the rolling preparation construction of steel box girder plates, the technical requirements for on-site welding construction, etc. will not be repeated in this embodiment, and the focus will be on the implementation method of the method involved in the present invention.

[0036] Figure 1 This is the construction flow chart of the accurate in-situ assembly of thick steel plate steel box beams of the present invention, refer to Figure 1As shown in the figure, the construction method of precise in-situ assembly of thick steel plate steel box beams includes the following construction steps:

[0037] 1) Construction Preparation: Review and calculate the dimensions of the support column 1; calculate and determine the spatial positions of the steel box flange section 2 and the box beam section 3; and roll the steel box bottom plate 4, steel box side plates 5, steel box partition plates 6, and steel box top plate 7 of the box beam section 3 in the prefabrication yard;

[0038] 2) Installation of prefabricated support: The prefabricated support includes a support base plate 8, a support column 1, a support top plate 9 and a platform top plate 10, and a safety net 85 is set around the platform top plate 10; the bottom end of the support column 1 is inserted into the plate top limit groove 11 on the upper surface of the support base plate 8, and the column bottom dense body 12 is filled in the gap between the support column 1 and the plate top limit groove 11, so that the support column 1 is perpendicular to the support base plate 8; a support roller 14 connected to the foundation soil 13 is set on the lower surface of the support base plate 8; a column clamp 15 is sleeved on the outer periphery of the support column 1, and a clamp side connecting groove 16 is set on the side wall of the column clamp 15, and a "U"-shaped column connecting bolt 17 is set between the clamp side connecting grooves 16 of adjacent support columns 1, and the outermost column is connected to the outermost column. An oblique support bolt 18 is provided between the side column clamp 15 facing away from the side of the bracket column 1 and the bracket bottom plate 8; a bracket top plate 9 is welded to the top of the bracket column 1, and a top plate slot 19 with a "U"-shaped cross section is provided at both ends of the bracket top plate 9; an adjustment bolt 20 is provided in the middle of the bracket top plate 9, and the adjustment bolt 20 is threadedly connected to the bracket top plate 9 and can be adjusted vertically; one side of the platform top plate 10 is inserted into the top plate slot 19, and the lower surface of the platform top plate 10 is connected to the column clamp 15 through the platform oblique brace 22; the lower end of the platform oblique brace 22 is fixedly connected to the column clamp 15, and the top of the platform oblique brace 22 is provided with a connecting support pier 23, and the connecting support pier 23 is connected to the support pier limit groove 21 on the lower surface of the platform top plate 10;

[0039] 3) Installation of steel box side panels: Place the steel box bottom panel 4 on the upper surface of the supporting bottom beam 25, and place the supporting bottom beam 25 on the upper end of the adjusting bolt 20 on the bracket top panel 9, and adjust the horizontality of the steel box bottom panel 4 by adjusting the bolt 20 and the bottom panel support pier 26; weld the vertical support plate 27 on the upper surface of the bracket top panel 9, and sequentially set the side panel positioning bolt 28 and the magnetic component 29 on the side of the vertical support plate 27 facing the steel box bottom panel 4, one end of the side panel positioning bolt 28 is fixedly connected to the vertical support plate 27, and the other end is connected to the magnetic component 29. Component 29; a top limit groove 30 is provided at the top of the vertical support plate 27, and a positioning top bolt 31 is provided on the groove wall of the top limit groove 30; an external lifting device is used to lift the steel box side panel 5 onto the steel box bottom plate 4, and the upper end of the steel box side panel 5 extends into the top limit groove 30. The magnetic component 29 is magnetic and can attract the steel box side panel 5. The side panel positioning bolt 28 and the positioning top bolt 31 are used simultaneously to control the verticality and lateral position of the steel box side panel 5, and the steel box side panel 5 is welded to the steel box bottom plate 4;

[0040] 4) Installation of steel box partition: 2~3 connecting rings 32 are respectively set on both side walls of the steel box partition 6, and the steel box partition 6 is connected to the position adjustment coil 35 on the conversion beam 34 through the connecting rings 32 and the connecting slings 33; a vertical position control body 36 is set between the upper end of the steel box partition 6 and the conversion beam 34, so that the conversion beam 34 is connected to the external lifting equipment through the lifting rope 37; a pair of supporting diagonal bars 38 are set on the steel box bottom plate 4, and the two pair of supporting diagonal bars 38 are symmetrically arranged; when the pair of supporting diagonal bars 38 faces An adjustment airbag 39 is provided at one end of the steel box partition 6, and rigid side plates 40 are pasted on both sides of the adjustment airbag 39, one of the rigid side plates 40 is fixedly connected to the end of the supporting diagonal rib 38, and elastic return ribs 41 are provided between the rigid side plates 40 on both sides of the adjustment airbag 39; an air pump support plate 42 is provided on the side of the supporting diagonal rib 38 away from the steel box partition 6, and a calibration air pump 43 is placed on the upper surface of the air pump support plate 42, and the calibration air pump 43 is connected to the adjustment airbag 39 through a pipeline, and the calibration air pump 43 is used to adjust the position The airbag 39 is inflated and deflated; the steel box partition 6 is hoisted onto the steel box bottom plate 4 by an external hoisting device so that the steel box partition 6 is located between the two opposing diagonal ribs 38, and the steel box partition 6 is adjusted to be perpendicular to the steel box bottom plate 4 by adjusting the airbag 39; and two mutually symmetrical sliding welding devices 44 are set on the steel box bottom plate 4 on both sides of the steel box partition 6; the sliding welding device 44 includes a welding machine support plate 49, a first guide plate 46, a second guide plate 47 and a first welder 50, and the first guide plate 46 and the second guide plate 47 are respectively The first guide plates 46 and the second guide plates 47 at both ends of the welding machine support plate 49 are connected to the guide plate limit grooves 48 on the steel box partition 6 and the steel box bottom plate 4, respectively. The guide plate limit grooves 48 are arranged along the length direction of the seam between the steel box partition 6 and the steel box bottom plate 4. The first welder 50 is installed on the welding machine support plate 49 and faces the seam between the steel box partition 6 and the steel box bottom plate 4. The first welder 50 moves along the guide plate limit grooves 48 under the action of external force, and the welding construction of the bottom plate weld 51 is carried out simultaneously.

[0041] 5) Installation of the steel box top plate: limit frame beams 54 are welded at both ends of the supporting bottom beam 25, and the limit frame beams 54 are connected with pressure bolts 56. A fastening bag 55 is provided on the limit frame beam 54 on the side facing the steel box bottom plate 4, and a fastening force is applied to the steel box side plate 5 through the fastening bag 55 and the pressure bolts 56 on the limit frame beam 54 simultaneously; the inner frame bottom plate 57 is placed on the steel box bottom plate 4, and inner frame support columns 58 and inner frame slide plates 84 are sequentially provided on the upper surface of the steel box bottom plate 4; a roller support frame 59 is provided on the side of the inner frame support column 58 facing the steel box side plate 5, and a side plate roller 60 is provided between the roller support frame 59 and the steel box side plate 5; a positioning support pier 61 is placed between the supporting bottom beam 25 and the bracket top plate 9, and a support pier positioning bolt 86 is connected to the end of the bracket top plate 9 close to the positioning support pier 61, and one end of the support pier positioning bolt 86 presses against the side of the positioning support pier 61 ; Lift the steel box top plate 7 to the upper end of the steel box side plate 5; first adjust the inclination angle of the supporting bottom beam 25 by adjusting the bolt reinforcement 20, the support pier positioning bolt 86 and the adjustment support pier 61, and then install the movable table 62 above the inner frame slide 84, so that the bottom plate connection 63 on the lower surface of the movable table 62 is connected to the movable slide groove on the inner frame slide 84; the movable table 62 is connected to the protective side plate 68, and the protective side plate 68 is hinged to the movable table 62 through the side plate hinge 69. Angle adjustment bolts 65 are provided between the protective side plate 68 and the movable table 62, and the top plate welder 66 is installed on the protective side plate 68; adjust the inclination angle of the top plate welder 66 by the angle adjustment bolts 65, and then use the top plate welder 66 to perform the top plate weld 67 construction, and synchronously move the top plate welder 66 and the movable table 62 along the inner frame slide 84 to weld the steel box top plate 7 to the steel box side plate 5;

[0042] 6) Connect and position the steel box flange section and the box beam section: weld the first support plate 70 to the outer side wall of the steel box side plate 5 of the box beam section 3, weld the first positioning bolt 71 to the upper surface of the first support plate 70, and weld the flange slot 72 to the upper end of the first positioning bolt 71; use external lifting equipment to lift the steel box flange section 2 onto the flange slot 72, and adjust the height of the steel box flange section 2 through the first positioning bolt 71; weld the fourth support plate 73 and the sixth support plate 74 to the upper surface of the steel box flange section 2, and weld a "U"-shaped support plate connecting reinforcement 80 on the side of the fourth support plate 73 facing the box beam section 3; weld the fifth support plate 75, the seventh support plate 76 and the second support plate 77 to the box beam section 3, and weld the fifth support plate 75, the seventh support plate 76 and the second support plate 77 to the side of the second support plate 77 facing the steel box flange A third support plate 78 is welded on the side of section 2, and an oblique support rib 79 is provided between the third support plate 78 and the second support plate 77; the fifth support plate 75 corresponds to the support plate connecting rib 80, and the seventh support plate 76 corresponds to the sixth support plate 74; a second positioning bolt 81 is provided between the fifth support plate 75 and the support plate connecting rib 80, a fourth positioning bolt 82 is provided between the sixth support plate 74 and the seventh support plate 76, and a third positioning bolt 83 is welded between the third support plate 78 and the steel box wing segment 2; the lateral relative position of the steel box wing segment 2 and the box beam segment 3 is controlled by the second positioning bolt 81, the vertical relative position of the steel box wing segment 2 is controlled by the third positioning bolt 83, and the oblique position of the steel box wing segment 2 and the box beam segment 3 is controlled by the fourth positioning bolt 82.

[0043] Figure 2 yes Figure 1 Schematic diagram of the assembly construction structure of steel box side panels and steel box partitions, Figure 3 yes Figure 2 Schematic diagram of the structure of the sliding welding device, Figure 4 yes Figure 1 Schematic diagram of steel box top plate welding construction structure, Figure 5 yes Figure 1 Cross-sectional view of the connection and positioning structure between the steel box flange section and the box beam section. Figure 6 yes Figure 1 Top view of the connection and positioning structure between the steel box flange section and the box beam section. Figures 2 to 6As shown, the thick steel plate steel box girder accurate in-situ assembly construction method fixes the support column 1 through the inter-column connecting bolt 17, the oblique supporting bolt 18, the plate top limiting groove 11 and the column bottom dense body 12; fixes the platform top plate 10 through the top plate slot 19, the connecting supporting pier 23 and the platform oblique support 22; positions the steel box side plate 5 through the side plate positioning bolt 28 and the positioning top bolt 31; uses the connecting sling 33 and the position adjusting air bag 39 to guide the hoisting of the steel box partition plate 6; uses the position adjusting bolt 20, the position adjusting supporting pier 61 and the supporting pier positioning bolt 86 to adjust the inclination angle of the box girder plate segment 3, controls the welding angle of the protective side plate 68 and the top plate welding machine 66 through the angle adjusting bolt 65 and the side plate hinge 69, and makes the moving platform 62 and the top plate welding machine 66 move along the moving sliding groove under the action of external force; the first position adjusting bolt 71 and the wing plate clamping groove 72 are arranged on the first supporting plate 70, and the steel box wing plate segment 2 can be positioned through the second position adjusting bolt 81, the third position adjusting bolt 83 and the fourth position adjusting bolt 82.

[0044] The assembled support includes the support column 1, the support bottom plate 8, the support top plate 9 and the platform top plate 10, and the safety fence 85 is arranged on the periphery of the platform top plate 10; wherein the support column 1 is rolled from a steel pipe and has a diameter of 300 mm; the plate top limiting groove 11 is rolled from a steel plate with a thickness of 2 mm and has a diameter of 500 mm and a height of 20 cm; the column bottom dense body 12 is filled in the gap between the support column 1 and the plate top limiting groove 11, and the column bottom dense body 12 is filled with dense graded medium-coarse sand; the support roller 14 arranged on the lower surface of the support bottom plate 8 is a steel roller with a diameter of 4 inches.

[0045] The steel box wing plate segment 2 and the box girder plate segment 3 are both rolled from a steel plate with a thickness of 20 mm, and the box girder plate segment 3 includes the steel box bottom plate 4, the steel box side plate 5, the steel box partition plate 6 and the steel box top plate 7.

[0046] The column hoop 15 sleeved outside the support column 1 is rolled from a steel plate with a thickness of 2 mm.

[0047] The hoop side connecting groove 16 is welded on the side wall of the column hoop 15, and the hoop side connecting groove 16 is rolled from a steel plate with a thickness of 10 mm and has a cross section in the shape of “L” and a height of 10 cm.

[0048] The “U”-shaped inter-column connecting bolt 17 is arranged between the adjacent hoop side connecting grooves 16, and the inter-column connecting bolt 17 includes two screw rods with a diameter of 20 mm and a nut, the two screw rods are threadedly connected to the two sides of the nut respectively, and the fastening directions of the two screw rods on the two sides of the nut are opposite; the length of the inter-column connecting bolt 17 is adjusted by rotating the nut in the middle.

[0049] The oblique support bolt 18 includes a screw and a nut with a diameter of 20 mm. The two screws are threadedly connected to the two sides of the nut, and the tightening directions of the screws on both sides of the nut are opposite. The two ends of the oblique support bolt 18 are respectively connected to the column clamp 15 and the bracket base plate 8 through the support bolt end hinge 24. The support bolt end hinge 24 adopts a ball hinge with a diameter of 20 mm.

[0050] A bracket top plate 9 is welded to the top of the bracket column 1. The bracket top plate 9 is made of a steel plate with a thickness of 3 mm and a rectangular cross section with a width of 30 cm and a height of 10 cm. A screw hole connected to the adjustment bolt rib (20) is provided on the bracket top plate 9; the adjustment bolt rib 20 has a diameter of 30 mm; and a top plate slot 19 with a "U"-shaped cross section is provided at both ends of the bracket top plate 9. The top plate slot 19 has a length of 30 cm and a height of 10 mm.

[0051] Insert one side of the platform top plate 10 into the top plate slot 19. Connect the lower surface to the connecting pier 23 at the top of the platform diagonal brace 22 via the pier stop slot 21. The pier stop slot 21 is made of 10mm thick steel plate and is 5cm high. The platform diagonal brace 22 is made of 100mm diameter steel pipe. The connecting pier 23 is made of 3mm thick steel plate and is 5cm high.

[0052] The safety barrier 85 is a steel mesh made of smooth steel columns with a diameter of 10 mm.

[0053] The supporting bottom beam 25 and the limiting frame beam 54 are both rolled from 10 mm thick steel plates and 30 cm wide. Both ends of the supporting bottom beam 25 are vertically welded to the limiting frame beam 54 .

[0054] The steel box bottom plate 4 is placed on the upper surface of the supporting bottom beam 25, and the horizontality of the steel box bottom plate 4 is adjusted by adjusting the bolt reinforcement 20 and the bottom plate support pier 26. The bottom plate support pier 26 is made of 10mm thick steel plate, is cubic, 3cm high and 20cm wide.

[0055] A vertical support plate 27 is welded on the upper surface of the bracket top plate 9. The vertical support plate 27 is made of a steel plate with a thickness of 10 mm and a width of 30 cm.

[0056] On the side of the vertical support plate 27 facing the steel box side panel 5, a side panel positioning bolt 28 and a magnetic component 29 are sequentially installed. The side panel positioning bolt 28 comprises a 30mm diameter screw and a nut. The two screws are threadedly connected to the nut on either side, and the tightening directions of the screws on both sides of the nut are opposite. The length of the side panel positioning bolt 28 can be adjusted by rotating the middle nut. The magnetic component 29 is an electromagnetic chuck, which is a conventional technology. When powered, it can generate magnetic force and can attract the steel box side panel 5.

[0057] The top of the vertical support plate 27 is provided with a top limit groove 30, which is rolled from a steel plate with a thickness of 10 mm, a width of 30 cm and a height of 20 cm.

[0058] A positioning top bolt 31 is connected to the groove wall of the top limit groove 30. A screw hole for connecting the positioning top bolt 31 is provided on the groove wall of the top limit groove 30. The positioning top bolt 31 is rolled from a screw rod with a diameter of 20 mm. The positioning top bolt 31 is threadedly connected to the screw hole on the top limit groove 30.

[0059] Two connecting rings 32 are respectively provided on both side walls of the steel box partition 6. The connecting rings 32 are made of smooth steel bars with a diameter of 20 mm and a diameter of 10 cm.

[0060] The top of the steel box bulkhead 6 is connected to a positioning winch 35 on a transfer beam 34 via a connecting hoist ring 32 and a connecting sling 33. Both the connecting sling 33 and the hoisting rope 37 are 30mm diameter steel wire ropes. The transfer beam 34 is rolled from H-shaped steel with dimensions of 300×300×10×15. The positioning winch 35 is a wire rope winch.

[0061] A vertical position control body 36 is provided between the steel box partition 6 and the conversion hanging beam 34. The vertical position control body 36 adopts a hydraulic jack with a stroke of 20 cm. One end of the vertical position control body 36 is fixed to the lower surface of the conversion hanging beam 34, and the other end is connected to the upper end of the steel box partition 6.

[0062] On the bottom plate 4 of the steel box, diagonal ribs 38 are provided. The diagonal ribs 38 are rolled from a 60mm diameter steel pipe. On the side of the diagonal ribs 38 facing the steel box partition 6, an adjustment airbag 39 is provided. The adjustment airbag 39 is sewn from a 2mm thick rubber sheet and has a volume of 20cm 3 Attached to both sides of the positioning airbag 39 are 2mm thick steel side panels 40. An elastic return rib 41, constructed from a 20mm diameter spring, is installed between the mirror-image steel side panels 40. When the positioning airbag 39 is inflated, the elastic return rib 41 stretches as the airbag 39 expands; when the airbag 39 deflates, the elastic return rib 41 also contracts.

[0063] An air pump support plate 42 is provided on the side of the supporting diagonal rib 38 away from the steel box partition 6. The air pump support plate 42 is made of a steel plate with a thickness of 2 mm and a width of 20 cm.

[0064] The calibration air pump 43 adopts an air pump, which is placed on the upper surface of the air pump support plate 42 and is connected to the position adjustment air bag 39 through a pipeline. The calibration air pump 43 is used to inflate and deflate the position adjustment air bag 39 to control the expansion and contraction of the position adjustment air bag 39.

[0065] Two symmetrical sliding welding devices 44 are set on the steel box bottom plate 4 on both sides of the steel box partition 6. The sliding welding device 44 includes a welding machine support plate 49, a first guide plate 46, a second guide plate 47 and a first welding machine 50. The first guide plate 46 and the second guide plate 47 are both rolled from a steel plate with a thickness of 10 mm, a width of 10 cm and a length of 30 cm. A first roller 52 is set at the junction of the first guide plate 46 and the steel box partition 6, and a second roller 53 is set at the junction of the second guide plate 47 and the steel box bottom plate 4. The roller 52 and the second roller 53 are both universal wheels with a diameter of 2 inches; the welding machine support plate 49 is made of a steel plate with a thickness of 10 mm and a width of 10 cm, and is welded to the first guide plate 46 and the second guide plate 47 at both ends; the guide plate limit groove 48 is made of a steel plate with a thickness of 10 mm and a width of 10 cm, and has an "L"-shaped cross section, and is welded to the connected steel box partition 6 and the steel box bottom plate (4); the first welding machine 50 is fixedly installed on the welding machine support plate 49, and the first welding machine 50 is a submerged arc welding machine.

[0066] The first welder 50 moves along the guide plate limiting groove 48 under the action of external force, and welds the seam between the steel box partition plate 6 and the steel box bottom plate 4 to form a bottom plate weld 51.

[0067] A fastening bag 55 and a pressure bolt 56 are installed on the limiting frame beam 54. The fastening bag 55 is made of 1mm thick rubber sheets sewn together to form a columnar bag structure with a height of 5cm, a length of 20cm, and a width of 10cm. The pressure bolt 56 is made of a rolled 30mm diameter screw and connected to the bolt hole on the limiting frame beam 54. The inner frame bottom plate 57 is rolled from 3mm thick steel plate and placed on the steel box bottom plate 4. Four inner frame support columns 58 are welded to the upper surface of the steel box bottom plate 4. The inner frame support columns 58 are rolled from 60mm diameter steel pipes and are equipped with height adjustment nuts. The inner frame slide 84 is rolled from 2mm thick steel plate, has a width of 30cm, and a height of 10cm. It is equipped with a movable slide with an inverted "T" cross-section.

[0068] A roller support frame 59 is arranged on the side of the inner frame support column 58 facing the steel box side panel 5. The roller support frame 59 is rolled from a steel plate with a thickness of 10 mm and is in a "π" shape and is welded to the inner frame support column 58; a side panel roller 60 is arranged between the roller support frame 59 and the steel box side panel 5, and the side panel roller 60 is a 2-inch universal ball wheel.

[0069] The adjustment support pier 61 is made of a steel plate with a thickness of 10 mm and a right-angled trapezoidal cross section, and is connected to the support pier positioning bolt 86. The support pier positioning bolt 86 pushes the adjustment support pier 61, driving the adjustment support pier 61 to move, thereby adjusting the inclination angle of the support bottom beam 25. The support pier positioning bolt (86) is made of a screw with a diameter of 30 mm and is rolled.

[0070] A bottom link 63 is welded to the lower surface of the movable plate 62. The bottom link 63 is made of a 10mm thick steel plate and has an inverted T-shaped cross section. The bottom link 63 is connected to the movable chute and can slide along the movable chute.

[0071] The angle adjustment bolt 65 consists of a 20mm diameter screw and a nut. The two screws are threaded onto the nut on either side, with the tightening directions of the screws on both sides of the nut opposite. The ends of the angle adjustment bolt 65 are hingedly connected to the protective side panels 68 and the movable platform 62 via a connecting hinge 45. The angle adjustment bolt 65 allows the angle between the protective side panels 68 and the top plate welder 66 to be adjusted. The top plate welder 66 is a submerged arc welder.

[0072] Under the action of external force, the top plate welder 66 and the movable platform 62 are moved along the inner frame slide 84, and the top plate weld 67 is formed by welding at the joints between the steel box partition 6 and the steel box top plate 7 or the steel box side plate 5 and the steel box top plate 7.

[0073] The protective side panels 68 are made of high temperature resistant glass. The side panel hinges 69 are made of ball hinges with a diameter of 30 mm.

[0074] The first support plate 70 and the wing plate slot 72 are both rolled from a steel plate with a thickness of 10 mm, wherein the cross section of the wing plate slot 72 is "U"-shaped.

[0075] The fourth support plate 73 and the sixth support plate 74 are welded to the upper surface of the steel box wing section 2, and a "U"-shaped support plate connecting reinforcement 80 is welded on the side of the fourth support plate 73 facing the box beam section 3. The fourth support plate 73, the sixth support plate 74 and the support plate connecting reinforcement 80 are all rolled from steel plates with a thickness of 10 mm.

[0076] The fifth support plate 75, the seventh support plate 76 and the second support plate 77 are welded on the box beam plate section 3, and the third support plate 78 is welded on the side of the second support plate 77 facing the steel box wing plate section 2. The fifth support plate 75, the seventh support plate 76, the second support plate 77 and the third support plate 78 are all rolled from steel plates with a thickness of 10 mm.

[0077] An oblique support rib 79 is provided between the third support plate 78 and the second support plate 77. The oblique support rib 79 is made of a steel plate with a thickness of 10 mm and a width of 10 cm.

[0078] The first positioning bolt 71 is welded to the upper surface of the first support plate 70 in sequence, the second positioning bolt 81 is arranged between the fifth support plate 75 and the support plate connecting reinforcement 80, the fourth positioning bolt 82 is arranged between the sixth support plate 74 and the seventh support plate 76, and the third positioning bolt 83 is welded between the third support plate 78 and the steel box wing section 2; the first positioning bolt 71, the second positioning bolt 81, the third positioning bolt 83 and the fourth positioning bolt 82 all include a screw and a nut with a diameter of 30 mm, and the two screws are threadedly connected to both sides of the nut, and the tightening directions of the screws on both sides of the nut are opposite; the length adjustment of the positioning bolt is achieved by rotating the middle bolt.

Claims

1. The construction method of precise in-situ assembly of thick steel plate steel box beams is characterized by: The construction steps include: 1) Construction preparation: Review and calculate the dimensions of the support columns (1); calculate and determine the spatial positions of the steel box flange section (2) and the box beam section (3), and pre-fabricate the steel box bottom plate (4), steel box side plates (5), steel box partitions (6), and steel box top plate (7) of the box beam section (3); 2) Installation of assembled bracket: The assembled bracket includes a bracket bottom plate (8), a bracket column (1), and a bracket top plate (9); insert the bottom end of the bracket column (1) into the plate top limiting groove (11) on the upper surface of the bracket bottom plate (8), and fill the gap between the bracket column (1) and the plate top limiting groove (11) with a column bottom dense body (12); sleeve a column clamp (15) on the outer periphery of the bracket column (1), and set a clamp side connecting groove (16) on the side wall of the column clamp (15); set an inter-column connecting bolt (17) between the clamp side connecting grooves (16) of adjacent bracket columns (1), and set an oblique support bolt (18) between the outermost column clamp (15) and the bracket bottom plate (8); set a bracket top plate (9) at the top end of the bracket column (1); set an adjustment bolt rib (20) in the middle of the bracket top plate (9); 3) Installation of steel box side panels: Place the steel box bottom panel (4) on the upper surface of the supporting bottom beam (25), place the supporting bottom beam (25) on the upper end of the adjusting bolt (20) on the bracket top panel (9), and adjust the horizontality of the steel box bottom panel (4) by adjusting the bolt (20) and the bottom panel support pier (26); set a vertical support panel (27) on the upper surface of the bracket top panel (9), and set a side panel positioning bolt (28) and a magnetic component (29) in sequence on the side of the vertical support panel (27) facing the steel box bottom panel (4), and one end of the side panel positioning bolt (28) is aligned with the vertical support panel (2 7) is fixedly connected, and the other end is connected to the magnetic component (29); a top limit groove (30) is set at the top of the vertical support plate (27), and a positioning top bolt (31) is set on the groove wall of the top limit groove (30); an external lifting device is used to hang the steel box side plate (5) on the steel box bottom plate (4), and the upper end of the steel box side plate (5) extends into the top limit groove (30), and the side plate positioning bolt (28) and the positioning top bolt (31) are used to control the verticality and horizontal position of the steel box side plate (5) at the same time, and the steel box side plate (5) is welded to the steel box bottom plate (4); 4) Installation of steel box partition: Set up diagonal supporting ribs (38) on the bottom plate (4) of the steel box, and set up two diagonal supporting ribs (38) symmetrically; set up a positioning airbag (39) on one end of the diagonal supporting rib (38) facing the steel box partition (6), and stick steel side panels (40) on both sides of the positioning airbag (39), one of the side panels (40) is fixedly connected to the end of the diagonal supporting rib (38), and set up elastic return ribs (41) between the steel side panels (40) on both sides of the positioning airbag (39); set up a positioning airbag (39) on the diagonal supporting rib (38) to adjust the position of the steel box partition (6 ... A positioning air pump (43) is provided, and the positioning air pump (43) is connected to the positioning air bag (39) through a pipeline; the steel box partition (6) is hung on the steel box bottom plate (4) and the steel box partition (6) is located between the two supporting diagonal ribs (38), and the verticality of the steel box partition (6) is adjusted by the positioning air bag (39); and two mutually symmetrical sliding welding devices (44) are provided on the steel box bottom plate (4) on both sides of the steel box partition (6); and the steel box partition (6) is welded to the steel box bottom plate (4) by the sliding welding devices (44); 5) Installation of the steel box top plate: Weld the limit frame beams (54) at both ends of the supporting bottom beam (25), connect the limit frame beams (54) with the top pressure bolts (56), set a fastening bag (55) on the limit frame beam (54) facing the steel box bottom plate (4), and simultaneously apply a fastening force to the steel box side plate (5) through the fastening bag (55) and the top pressure bolts (56) on the limit frame beam (54); place the inner frame bottom plate (57) on the steel box On the bottom plate (4), an inner frame support column (58) and an inner frame slide plate (84) are sequentially arranged on the upper surface of the steel box bottom plate (4); a roller support frame (59) is arranged on the side of the inner frame support column (58) facing the steel box side plate (5), and a side plate roller (60) is arranged between the roller support frame (59) and the steel box side plate (5); a position adjustment support pier (61) is placed between the supporting bottom beam (25) and the bracket top plate (9), and a position adjustment support pier (61) is placed on the bracket top plate (9) near the position adjustment support pier (61). One end of the support pier (61) is connected to the support pier positioning bolt (86), and one end of the support pier positioning bolt (86) is pressed against the side of the adjustment support pier (61); the steel box top plate (7) is hoisted to the upper end of the steel box side plate (5); the inclination angle of the supporting bottom beam (25) is adjusted by adjusting the bolt reinforcement (20), the support pier positioning bolt (86) and the adjustment support pier (61), and then the movable table (62) is installed above the inner frame slide (84) to make the movable table (62) 2) The bottom connecting member (63) of the lower surface is connected to the movable chute on the inner frame slide (84); a top plate welder (66) is provided on the movable table (62), the tilt angle of the top plate welder (66) is adjusted, and then the top plate welder (66) is used to construct the top plate weld (67), and the top plate welder (66) and the movable table (62) are synchronously moved along the inner frame slide (84) to weld and fix the steel box top plate (7) and the steel box side plate (5); 6) Connecting and positioning the steel box wing plate section and the box beam plate section: weld the first support plate (70) to the outer side wall of the steel box side plate (5) of the box beam plate section (3), weld the first alignment bolt (71) on the upper surface of the first support plate (70), and weld the wing plate clamping groove (72) at the upper end of the first alignment bolt (71); hang the steel box wing plate section (2) on the wing plate clamping groove (72), and adjust the height of the steel box wing plate section (2) through the first alignment bolt (71); weld the fourth support plate (73) and the sixth support plate (74) on the upper surface of the steel box wing plate section (2), and weld a "U"-shaped support plate connecting bar (80) on the side of the fourth support plate (73) facing the box beam plate section (3); weld the fifth support plate (75), the seventh support plate (76) and the second support plate (77) on the box beam plate section (3), and weld the fifth support plate (75), the seventh support plate (76) and the second support plate (77) on the box beam plate section (3). A third support plate (78) is welded to the second support plate (77) facing the steel box wing plate section (2), and an oblique support rib (79) is provided between the third support plate (78) and the second support plate (77); a second alignment bolt (81) is provided between the fifth support plate (75) and the support plate connecting rib (80), a fourth alignment bolt (82) is provided between the sixth support plate (74) and the seventh support plate (76), and a third alignment bolt (83) is welded between the third support plate (78) and the steel box wing plate section (2); the lateral relative position of the steel box wing plate section (2) and the box beam plate section (3) is controlled by the second alignment bolt (81), the vertical relative position of the steel box wing plate section (2) is controlled by the third alignment bolt (83), and the oblique position of the steel box wing plate section (2) and the box beam plate section (3) is controlled by the fourth alignment bolt (82).

2. The method for precise in-situ assembly of thick steel plate steel box beams according to claim 1 is characterized in that: In step 3), the side plate positioning bolt (28) includes a screw and a nut, the two screws are threadedly connected to the two sides of the nut, and the tightening directions of the screws on both sides of the nut are opposite; one end of the side plate positioning bolt (28) is welded to the vertical support plate (27); and the magnetic component (29) adopts an electromagnetic suction cup.

3. The method for precise in-situ assembly of thick steel plate steel box beams according to claim 1 is characterized in that: In step 4), the sliding welding device (44) includes a welding machine support plate (49), a first guide plate (46), a second guide plate (47) and a first welder (50), the first guide plate (46) and the second guide plate (47) are respectively arranged at the two ends of the welding machine support plate (49), and the first guide plate (46) and the second guide plate (47) at the two ends of the welding machine support plate (49) are respectively connected to the guide plate limiting grooves (48) on the steel box partition (6) and the steel box bottom plate (4), the guide plate limiting grooves (48) are arranged along the length direction of the joint between the steel box partition (6) and the steel box bottom plate (4), and the first welder (50) is installed on the welding machine support plate (49) and is directly opposite to the joint between the steel box partition (6) and the steel box bottom plate (4); the first welder (50) is moved along the guide plate limiting grooves (48) under the action of external force to perform welding construction of the bottom plate weld (51).

4. The method for precise in-situ assembly of thick steel plate steel box beams according to claim 3 is characterized in that: A first roller (52) is provided at the junction of the first guide plate (46) and the steel box partition (6), and a second roller (53) is provided at the junction of the second guide plate (47) and the steel box bottom plate (4); the guide plate limiting groove (48) is formed by rolling steel plates, and has an "L"-shaped cross section.

5. The method for precise in-situ assembly of thick steel plate steel box beams according to claim 1 is characterized in that: In step 4), when the steel box partition (6) is hoisted, connecting rings (32) are respectively provided on both side walls of the steel box partition (6), and the steel box partition (6) is connected to the position adjustment winding machine (35) on the conversion hanging beam (34) through the connecting rings (32) and the connecting slings (33); a vertical position control body (36) is provided between the upper end of the steel box partition (6) and the conversion hanging beam (34), and the conversion hanging beam (34) is connected to the external hoisting equipment through the hoisting rope (37); the vertical position control body (36) adopts a hydraulic jack.

6. The method for precise in-situ assembly of thick steel plate steel box beams according to claim 1 is characterized in that: In step 5), a protective side plate (68) is connected to the movable table (62), and the protective side plate (68) is hinged to the movable table (62) through a side plate hinge (69). An angle adjustment bolt (65) is provided between the protective side plate (68) and the movable table (62), and the top plate welder (66) is installed on the protective side plate (68); the angle of the protective side plate (68) and the top plate welder (66) is adjusted by the angle adjustment bolt (65).

7. The method for precise in-situ assembly of thick steel plate steel box beams according to claim 1 is characterized in that: In step 5), the cross section of the position-adjusting support pier (61) is a right-angled trapezoid, and one end of the support pier positioning bolt (86) is pressed against the side surface of the position-adjusting support pier (61); the support pier positioning bolt (86) pushes the position-adjusting support pier (61), thereby driving the position-adjusting support pier (61) to move, thereby adjusting the inclination angle of the supporting bottom beam (25).

8. The method for precise in-situ assembly of thick steel plate steel box beams according to claim 1, characterized in that: In step 5), the first calibration bolt (71), the second calibration bolt (81), the third calibration bolt (83) and the fourth calibration bolt (82) all include a nut and a screw, the two screws are threadedly connected to the two sides of the nut, and the tightening directions of the screws on both sides of the nut are opposite, and the first calibration bolt (71) is welded to the first support plate (70) and the wing plate slot (72) at both ends, the second calibration bolt (81) is welded to the fifth support plate (75), and the fourth calibration bolt (82) is welded to the seventh support plate (76).

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