CN115229436B - Large double-amplitude bolting type steel box girder total splicing method - Google Patents

Abstract

A large double-amplitude bolting type steel box girder total splicing method comprises the following steps: step 1, blanking: the cutting equipment is adopted to carry out blanking operation on the parts; step 2, checking: checking the external dimension, flatness, straightness and cut of the part after blanking; step 3, processing the U ribs of the bottom plate and the U ribs of the panel; step 4, manufacturing the single element of the bottom plate: step 5, manufacturing a diaphragm plate single element: step 6, manufacturing an inner web single element: step 7, manufacturing an anchor box unit element; step 8, manufacturing a panel unit element; step 9, manufacturing the middle cross beam single element; step 10, manufacturing a three-dimensional single element of a tuyere; step 11, manufacturing a steel box girder assembly jig frame; and step 12, manufacturing the steel box girder. The operation is simple, the manufacturing precision of the steel box girder can be improved, and the problems of bolting and corrosion prevention construction conflict of the middle cross beam are solved.

Description

Large double-amplitude bolting type steel box girder total splicing method

Technical Field

The invention belongs to the technical field of steel box girders, and particularly relates to a total splicing method of a large double-amplitude bolting type steel box girder.

Background

With the rapid development of the steel bridge manufacturing industry in China, large-scale double-amplitude bolting type steel box girders are more and more, and the double-amplitude bolting type steel box girders are integrally connected through middle cross beams in a bolting way by adopting separated double-amplitude boxes. The section of the steel box girder is large, and the manufacturing precision is difficult to ensure; the bolting surface of the middle cross beam is a friction surface, aluminum spraying treatment is needed before bolting, and the bolting of the middle cross beam and the aluminum spraying operation are mutually conflicting. For this reason, there is a need for improvements in the above-described method of making large double-width bolted steel box girders.

Disclosure of Invention

In view of the technical problems in the background art, the total splicing method of the large double-amplitude bolting type steel box girder provided by the invention is simple to operate, can improve the manufacturing precision of the steel box girder, and solves the problems of middle cross beam bolting and corrosion prevention construction conflict.

In order to solve the technical problems, the invention adopts the following technical scheme:

a large double-amplitude bolting type steel box girder total splicing method comprises the following steps:

step 1, blanking: the cutting equipment is adopted to carry out blanking operation on the parts;

step 2, checking: checking the external dimension, flatness, straightness and cut of the part after blanking;

step 3, processing the U ribs of the bottom plate and the U ribs of the panel;

step 4, manufacturing the single element of the bottom plate:

step 5, manufacturing a diaphragm plate single element: the diaphragm unit pieces include a diaphragm unit piece HG1 and a diaphragm unit piece HG2;

step 6, manufacturing an inner web single element:

step 7, manufacturing an anchor box unit element;

step 8, manufacturing a panel unit element;

step 9, manufacturing the middle cross beam single element;

step 10, manufacturing a three-dimensional single element of a tuyere;

step 11, manufacturing a steel box girder assembly jig frame;

and step 12, manufacturing the steel box girder.

Preferably, in step 1, a numerical control cutting machine is adopted to carry out blanking and beveling on a bottom plate, a diaphragm plate longitudinal and transverse stiffening plate, a manhole, a pipeline hole reinforcing ring, an inner web plate rib, an anchor side plate, an anchor box anchor backing plate, an anchor seat plate, a pi-shaped piece sealing plate, an anchor side plate vertical rib plate, a panel, a tooth-shaped plate, a middle beam upper flange plate, a middle beam lower flange plate, a middle beam web plate, a first longitudinal and transverse stiffening plate, a second longitudinal and transverse stiffening plate, a tuyere partition plate, a middle beam connecting partition plate and a partition plate embedded and repaired flange plate.

Preferably, the operation of step 3 is as follows:

step 3.1, selecting steel plates from a stock yard according to a plate arrangement diagram, checking plate numbers, and blanking by adopting a plasma numerical control gas cutting machine; the side bending of the plate after blanking is not more than 3mm, otherwise, the plate is adjusted before processing;

step 3.2, drawing longitudinal central lines of the bottom plate U ribs and the panel U ribs, making sample punching marks at two ends of the longitudinal central lines, and marking numbers at two ends of the bottom plate U ribs and the panel U ribs;

step 3.3, drilling holes on the U-shaped ribs of the panel: drilling the panel U-shaped rib by using a drill jig, wherein after the panel U-shaped rib is drilled, the periphery of the hole is not concave-convex, and the flatness of the hole is ensured;

step 3.4, milling grooves: milling grooves on a groove machine workbench on the bottom plate U rib plate piece and the panel U rib plate piece;

Step 3.5, pressing the U ribs of the bottom plate and the U ribs of the panel:

step 3.6, checking: cracks cannot be formed at the bent round corners of the bottom plate U ribs and the panel U ribs, on-site witness inspection is required when the first batch of bottom plate U ribs and the panel U ribs are processed, and at least 3 pieces of magnetic powder inspection is extracted to carry out full length inspection on the bent areas; and checking the cross-sectional dimensions of the U ribs of the bottom plate and the U ribs of the panel by adopting the U rib detection template.

Preferably, the operation of step 4 is as follows:

step 4.1, positioning and scribing: lifting the bottom plate on a platform, drawing a bottom plate datum line, and drawing a bottom plate U-rib positioning line and a diaphragm single element positioning line;

step 4.2, assembling the U ribs of the bottom plate: compacting the U rib of the bottom plate with the bottom plate through a U rib profiling module of the movable assembly machine, carrying out code-free assembly after alignment, and carrying out spot welding positioning by adopting carbon dioxide gas shielded welding;

step 4.3, welding U rib fillet weld of the bottom plate: placing the base plate unit element on an anti-deformation jig frame, and clamping and fixing the base plate unit element with the anti-deformation jig frame by adopting a hydraulic device; welding the U ribs of the bottom plate and the bottom plate by adopting a 6-head double-wire U rib gantry welding machine;

step 4.4, correcting the single element of the base plate: checking the flatness of the single element of the bottom plate, and correcting the part by flame;

step 4.5, checking and marking the single element of the bottom plate: hanging the single element of the bottom plate on an inspection platform, and inspecting the length, width, diagonal difference, welding quality and flatness of the single element of the bottom plate; and (5) marking the qualified single elements, and then transferring the qualified single elements into storage.

Preferably, the operation of step 5 is as follows:

step 5.1, positioning and scribing: hanging the diaphragm on a horizontal jig frame, and marking a transverse stiffening plate positioning line of the diaphragm;

step 5.2, installing transverse partition plate longitudinal and transverse stiffening plates 4 in a line, and measuring assembly gaps and verticality; assembling the manhole and the pipeline hole reinforcement ring 5 in two sections, and tightly attaching the edges of the holes; adopting carbon dioxide gas shielded automatic welding to weld welding seams of all parts; firstly, upper and lower flange plates are assembled and welded with the flange plates;

step 5.3, correcting the diaphragm plate single element: checking the flatness of the single element of the diaphragm plate, and correcting the flatness locally by flame;

step 5.4, hanging the diaphragm plate single element on an inspection platform, and inspecting the length, width, diagonal difference, welding quality and flatness of the diaphragm plate single element; and (5) marking the qualified single elements, and then transferring the qualified single elements into storage.

Preferably, the operation of step 6 is as follows:

step 6.1, positioning and scribing: lifting the inner web plate on a platform, and scribing an inner web plate rib assembly line, a diaphragm plate single element positioning line and an inspection line;

step 6.2, inner web plate rib assembly: installing an inner web plate rib on the line, performing positioning welding, and controlling the verticality of the installation of the inner web plate rib; the inner web single element is arranged on a hydraulic reverse deformation jig frame for welding;

Step 6.3, correcting the inner web single element: checking the flatness of the inner web single element, and correcting the flatness locally by flame;

step 6.4, checking and marking the inner web single element: hanging the inner web single element on an inspection platform, and inspecting the length, width, diagonal difference, welding quality and flatness of the single element; and (5) marking the qualified single elements, and then transferring the qualified single elements into storage.

Preferably, the operation of step 7 is as follows:

step 7.1, manufacturing an outer web single element: the manufacturing method is consistent with that of the inner web single element;

step 7.2, drawing an anchor side plate central line and an n-shaped component assembly positioning line on the non-structural side of the outer web single element, and checking;

step 7.3, assembling an anchor side plate on the anchor backing plate, and spot-welding to form an n-shaped component;

step 7.4, assembling the pi-shaped component on the non-structural side of the single element of the side web in a line manner, welding structural welding seams of the pi-shaped component and the web, wherein the welding seams are penetration welding seams, and performing nondestructive detection after welding;

step 7.5, installing and welding an anchor base plate on an anchor backing plate of the pi-shaped component, firstly welding the anchor base plate and the anchor backing plate to form a full circle fillet weld on the inner ring, and then welding three-side girth welds on the outer side;

step 7.6, welding vertical welding seams of the anchor backing plate and the anchor side plate;

step 7.7, mounting and welding a pi-shaped piece sealing plate on the pi-shaped component;

And 7.8, assembling and welding vertical rib plates of the anchor side plates, namely sequentially withdrawing from the near web plate side for assembling and welding.

Preferably, the operation of step 8 is as follows:

step 8.1, positioning and scribing: hanging the panel on a platform, drawing a panel datum line, and drawing a panel U-rib positioning line and a tooth-shaped plate positioning line;

step 8.2, assembling the U-shaped rib of the panel: compacting the U ribs of the panel with the panel through a U rib profiling module of the movable assembly machine, carrying out code-free assembly after alignment, and carrying out spot welding positioning by adopting carbon dioxide gas shielded welding;

step 8.3, welding U-rib fillet weld of the panel: placing the panel unit element on a reverse deformation jig frame, and clamping and fixing the panel unit element with the jig frame by adopting a hydraulic device; welding the U ribs of the panel by adopting a 6-head double-wire U rib gantry welding machine;

step 8.4, single element correction: checking the flatness of the single element of the panel, and correcting the flatness locally by flame;

step 8.5, welding the tooth-shaped plate: assembling the toothed plate according to the scribing, measuring the perpendicularity and the assembly clearance between the toothed plate and the panel, welding the U-rib fillet welds of the toothed plate, the panel and the panel, and performing secondary correction and newspaper inspection after welding;

step 8.6, inspecting and marking the panel unit elements: hanging the panel unit on an inspection platform, and inspecting the length, width, diagonal difference, welding quality and flatness of the unit; and (5) marking the qualified single elements, and then transferring the qualified single elements into storage.

Preferably, the operation of step 9 is as follows:

step 9.1, welding an upper flange plate of the middle beam and a lower flange plate of the middle beam: assembling a middle beam upper flange plate and a middle beam lower flange plate on a plane jig frame according to a graph, measuring the assembly gap and verticality between a middle beam web plate and the middle beam upper flange plate and the middle beam lower flange plate, and performing cantilever submerged arc automatic welding;

step 9.2, correcting the cross beam: flame straightening is adopted;

step 9.3, re-installing the jig frame after correction is completed, drawing an assembly line and an inspection line of the longitudinal stiffening ribs on the web plate of the middle beam, installing the longitudinal stiffening plates in a line manner, measuring the assembly gap and the perpendicularity between the longitudinal stiffening plates and the web plate of the middle beam, and positioning and welding for fixation;

step 9.4, turning over and assembling a longitudinal and transverse stiffening plate on the other side, and finishing welding; then turning over again to weld the welding seam of the stiffening plate with the front face in the longitudinal and transverse directions;

step 9.5, single element secondary correction: carrying out flame correction on the out-of-tolerance part;

step 9.6, drilling holes in the web plate of the middle beam and the lower flange plate of the middle beam: and (5) sleeve die drilling is adopted to ensure hole position accuracy.

Preferably, the operation of step 10 is as follows:

step 10.1, manufacturing a tuyere panel unit element, a tuyere bottom plate unit element and a tuyere side plate unit element: the manufacturing method is consistent with that of the inner web single element;

Step 10.2, positioning a horizontal jig frame on a single element of the tuyere bottom plate;

step 10.3, positioning a jig frame on the tuyere partition plate, checking the perpendicularity of the partition plate and the bottom plate, and temporarily supporting and stabilizing;

step 10.4, positioning a jig frame on the tuyere side plate;

step 10.5, positioning a jig on the tuyere panel, after the assembly is completed, spot-welding all welding seams firmly, and then welding the welding seams of the tuyere partition plate and the tuyere bottom plate;

step 10.6, welding a single element welding seam of the tuyere partition plate and the tuyere bottom plate; turning over to form a tuyere panel unit piece downwards, welding a tuyere partition plate and a tuyere panel unit piece and a tuyere side plate unit piece, and finally welding a tuyere side plate unit piece and a tuyere panel unit piece and a tuyere bottom plate unit piece;

step 10.7, flaw detection, correction and report detection are carried out in the next procedure;

the operation steps of step 11 are as follows:

step 11.1, calculating elevation values of the templates of the jig frames according to design line types, monitoring data values and inverse deformation empirical values;

step 11.2, setting up a jig frame according to a steel box girder total splicing jig frame diagram;

step 11.3, positioning identification setting: marking a marking line for positioning each element, a steel box girder center positioning line, a girder section center line, an angle positioning control line and the like on the ground of a jig frame area by utilizing the cooperation of a total station;

The operation of step 12 is as follows:

step 12.1, the base plate unit elements comprise base plate reference unit elements and adjacent base plate unit elements, and the base plate reference unit elements D1 and the base plate reference unit elements D4 are positioned on the jig frame;

step 12.2, positioning the adjacent bottom plate single element D2, the adjacent bottom plate single element D3, the adjacent bottom plate single element D5, the adjacent bottom plate single element D6 and the adjacent bottom plate single element D7 in sequence on the ground sample line by taking the central line of the bridge as a reference, and welding the bottom plate longitudinal seams in sequence;

step 12.3, after all the bottom plate unit elements on the two sides are installed and inspected, positioning and fixing a diaphragm plate unit element HG1 and a diaphragm plate unit element HG2 of a left box chamber and a right box chamber of the steel box girder, and assembling a diaphragm plate embedded flange plate;

step 12.4, positioning the inner web single element and the middle cross beam connecting partition board upper jig frame;

step 12.5, positioning the anchor box unit elements: after the anchor box unit elements are assembled in place, welding butt welds of the diaphragm plate unit elements HG1 and HG2 and welding butt welds of the diaphragm plate unit elements HG1, HG2 and the embedded flange plates in sequence; then, welding the fillet weld of the inner web single element and the diaphragm single element HG2, welding the fillet weld of the connecting diaphragm of the inner web single element and the middle beam, welding the fillet weld of the anchor box single element and the diaphragm single element HG1, welding the fillet weld of the anchor box single element and all the bottom plate single elements, welding the fillet weld of the inner web single element and the adjacent bottom plate single element D7, and welding the fillet welds of the diaphragm single element HG1, the diaphragm single element HG2 and all the bottom plate single elements;

Step 12.6, positioning the jig on the panel reference unit: sequentially welding fillet welds of the inner web unit, the anchor box unit and the reference panel unit M1, the reference panel unit M7, then sequentially positioning the adjacent panel unit M2, the adjacent panel unit M3, the adjacent panel unit M4, the adjacent panel unit M5, and the adjacent panel unit M6, welding the butt longitudinal seam of the reference panel unit M1 and the adjacent panel unit M2, welding the butt longitudinal seam of the adjacent panel unit M2 and the adjacent panel unit M3, welding the butt longitudinal seam of the adjacent panel unit M3 and the adjacent panel unit M4, welding the butt longitudinal seam of the adjacent panel unit M4 and the adjacent panel unit M5, welding the butt seam of the adjacent panel unit M5 and the adjacent panel unit M6, and welding the butt longitudinal seam of the adjacent panel unit M6 and the reference panel unit M7;

step 12.7, welding the welding seams of the toothed plate, the inner web single element, the diaphragm single element HG1 and the diaphragm single element HG2 in sequence, and welding the butt seam of the toothed plate;

step 12.8, positioning and fixing the single elements of the middle cross beam, welding butt welds of the panels, then drilling ink holes on a web plate of the middle cross beam and a connecting plate of a lower flange plate of the middle cross beam, derusting and aluminizing the connecting plate after drilling, and then mounting a high-strength bolt on a jig frame again; the middle beam single element positioning front bolt group is subjected to rust removal, aluminum spraying and protection;

Step 12.9, preparing high-strength bolt holes of a middle beam web plate and a middle beam lower flange plate: connecting and fixing a middle beam web plate and a middle beam lower flange plate by adopting a connecting plate, a locating pin and a common bolt, performing ink hole on a hole group on one side of the connecting plate, which is not drilled, by an ink hole device, removing the connecting plate, drilling the connecting plate on a rocker arm drill, marking the connecting plate, resetting the connecting plate after drilling, primarily screwing a torque wrench, and finally screwing in place after welding flange butt welding;

step 12.10, assembling and welding a three-dimensional single element of the tuyere;

step 12.11, beam segment correction: after the main structure of the beam section is welded, the beam Duan Yaoshu is released;

step 12.12, correcting the position: free plate edges at two ends of the beam section are deformed in a wave mode, staggered edges of the port plates are matched, and longitudinal welding seam angles are deformed; the angle points of the beam section ports are out of tolerance, and the height line shape of the free edge is poor;

correction means: the baking gun and the matched tool are adopted to correct the fire in the place to be corrected,

step 12.11, installing matching accessory facilities on the line according to the graph;

step 12.12, segment control point placement and protection: after all the sections of each round are constructed and inspected to be qualified, positioning marks and marks are manufactured at the positions of the left compartment chamber, the right compartment chamber, the middle cross beam and the ports of the adjacent sections, and the positioning marks and the marks are protected by adhesive tapes; then, the other sections enter the coating and storing procedures except the reserved sections of the lower wheel preassembled;

Step 12.13, retesting the jig frame: and adjusting the template line shape of the assembly jig frame according to the design line shape, and fixing the last section in the previous round of assembly construction on the jig frame to serve as a reference section, and sequentially carrying out assembly construction of adjacent subsequent sections.

The following beneficial effects can be achieved in this patent:

1. the reasonable welding sequence reduces welding deformation and correction workload;

2. the precision control of the steel box girder is facilitated;

3. and the U-rib inspection tool is adopted for inspection, so that the inspection efficiency is improved.

4. The steel box girder matching manufacture improves the matching precision of the steel box girder and shortens the installation period of the steel box girder.

5. The construction is convenient, and the production progress, the construction quality and the construction safety of the large steel box girder are ensured.

Drawings

The invention is further illustrated by the following examples in conjunction with the accompanying drawings:

FIG. 1 is a diagram of a base unit cell of the present invention;

FIG. 2 is a section A-A of FIG. 1;

FIG. 3 is a block diagram of a diaphragm unit piece HG1 of the present invention;

FIG. 4 is a section A-A of FIG. 3;

FIG. 5 is a block diagram of a diaphragm unit piece HG2 of the present invention;

FIG. 6 is a section A-A of FIG. 5;

FIG. 7 is a section B-B of FIG. 5;

FIG. 8 is a view of an inner web unit piece according to the present invention;

FIG. 9 is a section A-A of FIG. 8;

FIG. 10 is a single element view of the anchor box of the present invention;

FIG. 11 is a diagram of a panel unit according to the present invention;

FIG. 12 is a section A-A of FIG. 11;

FIG. 13 is a cross-beam single element diagram of the present invention;

FIG. 14 is a section A-A of FIG. 13;

FIG. 15 is a perspective single element view of the tuyere of the present invention;

FIG. 16 is a front view of a steel box girder of the present invention;

FIG. 17 is a left block diagram of FIG. 16;

FIG. 18 is a right block diagram of FIG. 16;

FIG. 19 is a plan view of the bottom plate of the steel box girder of the present invention;

FIG. 20 is a block diagram (plan view) of a steel box girder assembly of the present invention;

FIG. 21 is a view of a steel box girder assembly jig frame of the present invention (front view);

FIG. 22 is a drawing of a U-rib inspection template of the present invention.

In the figure: the device comprises a bottom plate 1, a bottom plate U rib 2, a diaphragm plate 3, a diaphragm plate longitudinal and transverse stiffening plate 4, a pipeline hole reinforcing ring 5, an inner web plate 6, an inner web plate rib 7, an anchor side plate 9, an anchor box anchor backing plate 10, an anchor seat plate 11, a pi-shaped piece sealing plate 12, an anchor side plate vertical rib plate 13, a panel 14, a panel U rib 15, a tooth-shaped plate 16, a middle beam upper flange plate 17.1, a middle beam lower flange plate 17.2, a middle beam web plate 18, a first longitudinal and transverse stiffening plate 19, a second longitudinal and transverse stiffening plate 20, a tuyere panel unit element 21, a tuyere bottom plate unit element 22, a tuyere side plate unit element 23, a tuyere partition plate 24, a middle beam connecting partition plate 25, a partition plate embedding and supplementing flange plate 26, an inner web unit element 27, an anchor box unit element 28, a middle beam unit element 29, a tuyere three-dimensional unit element 30 and a U rib detection template 31.

Detailed Description

The preferred scheme is shown in fig. 1 to 22, a large double-amplitude bolting type steel box girder general splicing method,

step 1, blanking: the cutting equipment is adopted to carry out blanking operation on the parts;

the bottom plate 1, the diaphragm plate 3, the diaphragm plate longitudinal and transverse stiffening plates 4, the manhole, the pipeline hole reinforcing ring 5, the inner web 6, the inner web plate rib 7, the anchor side plate 9, the anchor box anchor backing plate 10, the anchor seat plate 11, the n-shaped piece sealing plate 12, the anchor side plate vertical rib plate 13, the panel 14, the tooth plate 16, the middle beam upper flange plate 17.1, the middle beam lower flange plate 17.2, the middle beam web 18, the first longitudinal and transverse stiffening plate 19, the second longitudinal and transverse stiffening plate 20, the tuyere partition plate 24, the middle beam connecting partition plate 25 and the partition plate embedded and repaired flange plate 26 are subjected to blanking and beveling by adopting a numerical control cutting machine.

The plate thickness of the anchor box anchor backing plate 10 and the anchor seat plate 11 is 80mm, the perforating difficulty is high, the boring precision requirement is high, multiple cutting tests are required before blanking, the process is continuously adjusted, and the blanking and boring precision of the anchor backing plate 10 and the anchor seat plate 11 is ensured to meet the process requirement.

Step 2, checking: checking the external dimension, flatness, straightness and cut of the part after blanking;

step 3, processing the bottom plate U rib 2 and the panel U rib 15;

Step 3.1, selecting steel plates from a stock yard according to a plate arrangement diagram, checking plate numbers, and blanking by adopting a plasma numerical control gas cutting machine; the side bending of the plate after blanking is not more than 3mm, otherwise, the plate is adjusted before processing;

step 3.2, drawing longitudinal central lines of the bottom plate U rib 2 and the panel U rib 15, making sample punching marks at two ends of the longitudinal central lines, and marking numbers at two ends of the bottom plate U rib 2 and the panel U rib 15;

step 3.3, drilling holes in the panel U-ribs 15: drilling the panel U rib 15 by using a drill jig, wherein after the panel U rib 15 is drilled, no concave-convex part is formed around the hole, and the flatness of the panel U rib 15 must be ensured;

polishing the protruding part of the outer edge of the drilling hole by a polishing machine in the later stage;

step 3.4, milling grooves: milling grooves on a groove machine workbench on the bottom plate U-rib 2 plate and the panel U-rib 15 plate;

milling all bevel angles according to the drawing requirements, wherein the surface roughness Ra is lower than 25um;

step 3.5, pressing the bottom plate U rib 2 and the panel U rib 15:

the bottom plate U rib 2 and the panel U rib 15 are pressed by adopting a numerical control plate bending machine, so that the grooves are ensured to face downwards; fixing the plate by using a positioning die, and fine-adjusting by using a screw rod to accurately position the plate; the pressing is performed in the middle of the press as much as possible without biasing, so that the stress of the press is uniform.

Step 3.6, checking: cracks cannot be formed at the bent round corners of the bottom plate U ribs 2 and the panel U ribs 15, on-site witness inspection is required when the first batch of bottom plate U ribs 2 and the panel U ribs 15 are processed, and at least 3 pieces of magnetic powder inspection is extracted to perform full length inspection on the bent areas; the cross-sectional dimensions of the floor U-ribs 2 and the panel U-ribs 15 are inspected using the U-rib inspection jig 31.

Flaw detection standard GB/T26952-2011;

step 4, manufacturing the single elements (D1-D7) of the bottom plate: the panel unit comprises a bottom plate 1 and a bottom plate U rib 2;

step 4.1, positioning and scribing: lifting the bottom plate 1 on a platform, drawing a base line of the bottom plate 1, and drawing a positioning line of the U rib 2 of the bottom plate and a positioning line of a single element of the diaphragm;

step 4.2, assembling the U rib 2 of the bottom plate: compacting the U rib 2 of the bottom plate with the bottom plate 1 through a U rib profiling module of the movable assembly machine, performing code-free assembly after alignment, and performing spot welding positioning by adopting carbon dioxide gas shielded welding;

step 4.3, welding the fillet weld of the U rib 2 of the bottom plate: placing the base plate unit element on an anti-deformation jig frame, and clamping and fixing the base plate unit element with the anti-deformation jig frame by adopting a hydraulic device; welding the bottom plate U rib 2 and the bottom plate 1 by adopting a 6-head double-wire U rib gantry welding machine;

strictly cleaning a welding line area before welding and strictly executing a welding process to ensure that the penetration of the welding line meets the requirement; the bottom plate U rib is a part of the bottom plate unit element; the base plate unit element is composed of a base plate and a base plate U rib;

Step 4.4, correcting the single element of the base plate: checking the flatness of the single element of the bottom plate, and correcting the part by flame;

the correction temperature is controlled to be 600-800 ℃, natural cooling is performed, and overburning, hammering and water cooling are strictly forbidden;

step 4.5, checking and marking the single element of the bottom plate: hanging the single element of the bottom plate on an inspection platform, and inspecting the length, width, diagonal difference, welding quality and flatness of the single element of the bottom plate; and (5) marking the qualified single elements, and then transferring the qualified single elements into storage.

Step 5, manufacturing a diaphragm plate single element: the diaphragm plate single element comprises a diaphragm plate 3, a diaphragm plate longitudinal and transverse stiffening plate 4 and a pipeline hole reinforcement ring 5;

step 5.1, positioning and scribing: hanging the diaphragm plate 3 on a horizontal jig frame, and marking positioning lines of the diaphragm plate longitudinal and transverse stiffening plates 4;

step 5.2, installing transverse partition plate longitudinal and transverse stiffening plates 4 in a line, and measuring assembly gaps and verticality; assembling the manhole and the pipeline hole reinforcement ring 5 in two sections, and tightly attaching the edges of the holes; adopting carbon dioxide gas shielded automatic welding to weld welding seams of all parts; firstly, upper and lower flange plates are assembled and welded with the flange plates;

step 5.3, correcting the diaphragm plate single element: checking the flatness of the single element of the diaphragm plate, and correcting the flatness locally by flame;

the correction temperature is controlled to be 600-800 ℃, natural cooling is performed, and overburning, hammering and water cooling are strictly forbidden;

Step 5.4, hanging the diaphragm plate single element on an inspection platform, and inspecting the length, width, diagonal difference, welding quality and flatness of the diaphragm plate single element; and (5) marking the qualified single elements, and then transferring the qualified single elements into storage.

Step 6, manufacturing an inner web single element: the inner web unit piece 27 includes an inner web 6, an inner web plate rib 7;

step 6.1, positioning and scribing: lifting the inner web 6 on a platform, and scribing an assembly line of the inner web plate ribs 7, a diaphragm plate single element positioning line and an inspection line;

step 6.2, inner web plate rib 7 assembly: the inner web plate rib 7 is arranged on the line and is subjected to positioning welding, and the verticality of the inner web plate rib 7 is controlled; the inner web single element is arranged on a hydraulic reverse deformation jig frame for welding;

step 6.3, correcting the inner web single element: checking the flatness of the inner web single element, and correcting the flatness locally by flame;

the correction temperature is controlled to be 600-800 ℃, natural cooling is performed, and overburning, hammering and water cooling are strictly forbidden;

step 6.4, checking and marking the inner web single element: hanging the inner web single element on an inspection platform, and inspecting the length, width, diagonal difference, welding quality and flatness of the single element; and (5) marking the qualified single elements, and then transferring the qualified single elements into storage.

Step 7, manufacturing an anchor box unit element; the anchor box unit element 28 comprises an anchor side plate 9, an anchor box anchor backing plate 10, an anchor seat plate 11, an n-shaped piece sealing plate 12 and an anchor side plate vertical rib plate 13;

Step 7.1, manufacturing the outer web single element 8: the manufacturing method is consistent with that of the inner web single element;

7.2, drawing a central line of the anchor side plate 9 on the non-structural side of the outer web single element 8, assembling a positioning line for the pi-shaped part, and checking;

step 7.3, assembling an anchor side plate 9 on the anchor backing plate 10, and spot-welding to form an n-shaped component;

ensuring that the deviation of the perpendicularity of the anchor backing plate 10 and the anchor side plate 9 is not more than 1.5mm;

step 7.4, assembling the pi-shaped component on the non-structural side of the side web single element 8 in a line mode, welding structural welding seams of the pi-shaped component and the web, wherein the welding seams are penetration welding seams, and performing nondestructive detection after welding;

note that the two anchor side plates 9 are symmetrically welded at the same time, the corner points at the two sides of the anchor backing plate 10 are filled with welding seams and polished uniformly, and after the welding seams pass the flaw detection, the welding toes are hammered to eliminate the stress.

Step 7.5, installing and welding an anchor base plate 11 on an anchor base plate 10 of the pi-shaped component, firstly welding a full circle fillet weld of the anchor base plate 11 and the anchor base plate 10 on the inner ring, and then welding three-side girth welds on the outer side;

step 7.6, welding a vertical welding seam between the anchor backing plate 10 and the anchor side plate 9;

note symmetric welding, post-weld non-destructive testing.

Step 7.7, welding a pi-shaped piece sealing plate 12 on the pi-shaped component;

and 7.8, assembling and welding the vertical rib plates 13 of the anchor side plates, namely sequentially withdrawing from the near web plate side for assembling and welding.

Step 8, manufacturing a panel unit element; the panel unit includes a panel 14, a panel U-rib 15, and a tooth plate 16;

step 8.1, positioning and scribing: hanging the panel 14 on a platform, drawing a panel 14 datum line, and drawing a panel U rib 15 positioning line and a tooth-shaped plate 16 positioning line;

step 8.2, panel U-rib 15 assembly: compacting the panel U-shaped rib 15 and the panel 14 through a U-shaped rib profiling module of the movable assembly machine, performing code-free assembly after alignment, and performing spot welding positioning by adopting carbon dioxide gas shielded welding;

step 8.3, welding the fillet weld of the U rib 15 of the panel: placing the panel unit element on a reverse deformation jig frame, and clamping and fixing the panel unit element with the jig frame by adopting a hydraulic device; welding the panel U rib 15 by adopting a 6-head double-wire U rib gantry welding machine;

strictly cleaning a welding line area before welding and strictly executing a welding process to ensure that the penetration of the welding line meets the requirement;

step 8.4, single element correction: checking the flatness of the single element of the panel, and correcting the flatness locally by flame;

the correction temperature is controlled to be 600-800 ℃, natural cooling is performed, and overburning, hammering and water cooling are strictly forbidden;

step 8.5, welding the tooth plate 16: assembling the toothed plate 16 according to the scribing, measuring the perpendicularity and the assembly clearance between the toothed plate 16 and the panel 14, welding fillet welds between the toothed plate 16 and the panel 14 and between the toothed plate 16 and the panel U-shaped rib 15, and performing secondary correction and checking after welding;

Step 8.6, inspecting and marking the panel unit elements: hanging the panel unit on an inspection platform, and inspecting the length, width, diagonal difference, welding quality and flatness of the unit; and (5) marking the qualified single elements, and then transferring the qualified single elements into storage.

Step 9, manufacturing the middle cross beam single element; the middle beam unit element comprises a middle beam upper flange plate 17.1, a middle beam lower flange plate 17.2, a middle beam web 18, a first longitudinal and transverse stiffening plate 19 and a second longitudinal and transverse stiffening plate 20;

step 9.1, welding the upper flange plate 17.1 of the middle beam and the lower flange plate 17.2 of the middle beam: assembling a middle beam upper flange plate 17.1 and a middle beam lower flange plate 17.2 on a plane jig according to the diagram, measuring the assembly clearance and verticality between a middle beam web 18 and the middle beam upper flange plate 17.1 and the middle beam lower flange plate 17.2, and performing cantilever submerged arc automatic welding;

step 9.2, correcting the cross beam: flame straightening is adopted;

the correction temperature is controlled to be 600-800 ℃, natural cooling is performed, and overburning, hammering and water cooling are strictly forbidden; the observation and measurement should be carried out at any time, and the observation and measurement should be stopped appropriately so as to avoid the correction of the over-head;

step 9.3, re-installing the jig frame after correction is completed, drawing an assembly line and an inspection line of the longitudinal and transverse stiffening ribs 19 on the web 18 of the middle cross beam, installing the longitudinal and transverse stiffening plates 19 in a line manner, measuring the assembly clearance and the verticality between the longitudinal and transverse stiffening plates 19 and the web 18 of the middle cross beam, and positioning and welding for fixation;

Step 9.4, turning over and assembling the stiffening plate 20 on the other side in the longitudinal and transverse directions, and finishing welding; then turning over again to weld the welding seams of the stiffening plates 19 in the front longitudinal and transverse directions;

step 9.5, single element secondary correction: carrying out flame correction on the out-of-tolerance part;

checking the flatness of the single element of the middle cross beam, locally adopting flame correction, controlling the correction temperature to be 600-800 ℃, naturally cooling, and strictly prohibiting overburning, hammering and water cooling.

Step 9.6, drilling holes in the middle beam web 18 and the middle beam lower flange plate 17.2: in order to ensure the hole position precision, sleeve die drilling is adopted (all templates adopt a number control hole to ensure the hole position precision).

Step 10, manufacturing a three-dimensional single element of a tuyere; the tuyere solid single element comprises a tuyere panel single element 21, a tuyere bottom plate single element 22, a tuyere side plate single element 23 and a tuyere partition plate 24;

step 10.1, manufacturing a tuyere panel unit piece 21, a tuyere bottom plate unit piece 22 and a tuyere side plate unit piece 23;

step 10.2, positioning a horizontal jig frame on the tuyere bottom plate unit element 22;

step 10.3, positioning a jig frame on the tuyere partition plate 24, checking the perpendicularity of the partition plate 24 and the bottom plate 22, and temporarily supporting and stabilizing;

step 10.4, positioning a jig frame on the tuyere side plate 23;

Step 10.5, positioning the jig frame on the tuyere panel 21, and after the assembly is completed, firmly spot-welding all welding seams;

step 10.6, welding the welding seam between the tuyere stock 24 and the tuyere stock unit element 22; turning over to enable the tuyere panel unit piece 21 to face downwards, welding the welding seams of the tuyere partition plate 24 and the tuyere panel unit piece 21 and the tuyere side plate unit piece 23, and finally welding the welding seams of the tuyere side plate unit piece 23 and the tuyere panel unit piece 21 and the tuyere bottom plate unit piece 22;

step 10.7, flaw detection, correction and report detection are carried out in the next procedure;

step 11, manufacturing a steel box girder assembly jig frame;

step 11.1, calculating elevation values of the templates of the jig frames according to design line types, monitoring data values and inverse deformation empirical values;

step 11.2, setting up a jig frame according to a steel box girder total splicing jig frame diagram;

the elevation value error of the jig frame template is not more than 2mm.

Step 11.3, positioning identification setting: marking longitudinal and transverse marking lines, a steel box girder central positioning line, a girder section central line, an angle positioning control line and the like for positioning each single element on the ground of a jig frame area by utilizing the cooperation of total stations;

and step 12, manufacturing the steel box girder.

During the segment manufacture, the matching manufacture is carried out on the tire frames simultaneously according to the thought of '6+1', '4+1', the segments on the tire frames are taken as the whole object, the space linear inspection and the inter-segment port matching precision inspection are carried out, and the adjustment is carried out according to the design requirement line type until the design requirement is met;

Step 12.1, the base plate unit elements comprise base plate reference unit elements and adjacent base plate unit elements, and the base plate reference unit elements D1 and the base plate reference unit elements D4 are positioned on the jig frame;

the base plate reference unit D1 and the base plate reference unit D4 are positioned and the bolt hole group is required to be sprayed with aluminum and protected;

step 12.2, positioning the adjacent bottom plate single element D2, the adjacent bottom plate single element D3, the adjacent bottom plate single element D5, the adjacent bottom plate single element D6 and the adjacent bottom plate single element D7 in sequence on the ground sample line by taking the central line of the bridge as a reference, and welding the bottom plate longitudinal seams in sequence;

the bolt hole groups before positioning the adjacent bottom plate unit elements D2, the adjacent bottom plate unit elements D3, the adjacent bottom plate unit elements D5, the adjacent bottom plate unit elements D6 and the adjacent bottom plate unit elements D7 are required to be sprayed with aluminum and protected;

step 12.3, after all the bottom plate unit elements on the two sides are installed and inspected, positioning and fixing a diaphragm plate unit element HG1 and a diaphragm plate unit element HG2 of a left box chamber and a right box chamber of the steel box girder, and assembling a diaphragm plate embedding flange plate 26;

step 12.4, positioning the inner web single element 27 and the upper jig frame of the middle beam connecting partition plate 25;

the middle beam connecting partition plate 25 needs to remove rust, spray aluminum and protect the bolt group before positioning;

step 12.5, anchor box unit piece 28 positioning: the positioning precision requirement of the anchor box unit element 28 is high, and the front and rear positions, the involution degree of the four corner points and the landmark points and the center positioning line of the anchor box are strictly controlled; after the anchor box unit pieces 28 are assembled in place, butt welding seams of the diaphragm plate unit pieces HG1 and HG2 and butt welding seams of the diaphragm plate unit pieces HG1, HG2 and the embedded flange plates 26 are sequentially welded; then, the fillet welds of the inner web unit piece 27 and the diaphragm unit piece HG2, the fillet welds of the inner web unit piece 27 and the middle cross member connecting diaphragm 25, the fillet welds of the anchor box unit piece 28 and the diaphragm unit piece HG1, the fillet welds of the anchor box unit piece 28 and all the bottom plate unit pieces, the fillet welds of the inner web unit piece 27 and the adjacent bottom plate unit piece D7, and the fillet welds of the diaphragm unit piece HG1, the diaphragm unit piece HG2 and all the bottom plate unit pieces are welded;

Step 12.6, positioning the jig on the panel reference unit: sequentially welding fillet welds of the inner web unit 27, the anchor box unit 28 and the reference panel unit M1, the reference panel unit M7, then sequentially positioning the adjacent panel unit M2, the adjacent panel unit M3, the adjacent panel unit M4, the adjacent panel unit M5, and the adjacent panel unit M6, welding the butt longitudinal seam of the reference panel unit M1 and the adjacent panel unit M2, welding the butt longitudinal seam of the adjacent panel unit M2 and the adjacent panel unit M3, welding the butt longitudinal seam of the adjacent panel unit M3 and the adjacent panel unit M4, welding the butt longitudinal seam of the adjacent panel unit M4 and the adjacent panel unit M5, welding the butt seam of the adjacent panel unit M5 and the adjacent panel unit M6, and welding the butt longitudinal seam of the adjacent panel unit M6 and the reference panel unit M7;

step 12.7, welding the welding seams of the toothed plate 16, the inner web single element 28, the diaphragm single element HG1 and the diaphragm single element HG2 in sequence, and welding the butt seam of the toothed plate 16;

12.8, positioning and fixing the single element 29 of the middle beam, welding butt welds of the panels, then drilling ink holes on the connecting plates of the web 18 of the middle beam and the lower flange plate 17.2 of the middle beam, derusting and aluminizing the drilled connecting plates, and then mounting high-strength bolts on the jig frame again; the middle beam single element 29 performs rust removal, aluminum spraying and protection on the bolt group before positioning;

Step 12.9, preparing high-strength bolt holes of the middle beam web 18 and the middle beam lower flange plate 17.2: connecting and fixing a middle beam web 18 and a middle beam lower flange plate 17.2 by adopting a connecting plate, a locating pin and a common bolt, performing ink hole on a hole group on one side of the connecting plate, which is not drilled, by an ink hole device, removing the connecting plate, drilling the connecting plate on a rocker arm drill, marking the connecting plate, resetting the connecting plate after drilling, primarily screwing a torque wrench, welding flange butt welding seams, and finally screwing in place;

step 12.10, assembling and welding a tuyere three-dimensional single element 30;

step 12.11, beam segment correction: after the main structure of the beam section is welded, the beam Duan Yaoshu (a bottom plate, a jig frame, a temporary reinforcing support and the like) is released;

step 12.12, correcting the position: free plate edges at two ends of the beam section are deformed in a wave mode, staggered edges of the port plates are matched, and longitudinal welding seam angles are deformed; the angle points of the beam section ports are out of tolerance, and the height line shape of the free edge is poor;

correction means: the baking gun and the matched tool are adopted to correct the fire in the place to be corrected,

auxiliary tools such as a weight, a jack and the like and tools can be adopted as matched tools;

step 12.11, installing matching accessory facilities on the line according to the graph;

step 12.12, segment control point placement and protection: after all the sections of each round are constructed and inspected to be qualified, positioning marks and marks are manufactured at the positions of the left compartment chamber, the right compartment chamber, the middle cross beam and the ports of the adjacent sections, and the positioning marks and the marks are protected by adhesive tapes; then, the other sections enter the coating and storing procedures except the reserved sections of the lower wheel preassembled;

Step 12.13, retesting the jig frame: and adjusting the template line shape of the assembly jig frame according to the design line shape, and fixing the last section in the previous round of assembly construction on the jig frame to serve as a reference section, and sequentially carrying out assembly construction of adjacent subsequent sections.

The above embodiments are only preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention should be defined by the claims, including the equivalents of the technical features in the claims. I.e., equivalent replacement modifications within the scope of this invention are also within the scope of the invention.

Claims (1)

1. The total splicing method of the large double-amplitude bolting type steel box girder is characterized by comprising the following steps of:

step 1, blanking: the cutting equipment is adopted to carry out blanking operation on the parts;

step 2, checking: checking the external dimension, flatness, straightness and cut of the part after blanking;

step 3, processing the bottom plate U rib (2) and the panel U rib (15);

step 4, manufacturing the single element of the bottom plate:

step 5, manufacturing a diaphragm plate single element:

step 6, manufacturing an inner web single element:

step 7, manufacturing an anchor box unit element;

Step 8, manufacturing a panel unit element;

step 9, manufacturing the middle cross beam single element;

step 10, manufacturing a three-dimensional single element of a tuyere;

step 11, manufacturing a steel box girder assembly jig frame;

step 12, manufacturing a steel box girder;

in the step 1, a numerical control cutting machine is adopted to carry out blanking and opening on a bottom plate (1), a diaphragm plate (3), a diaphragm plate longitudinal and transverse stiffening plate (4), a manhole, a pipeline hole reinforcing ring (5), an inner web plate (6), an inner web plate rib (7), an anchor side plate (9), an anchor box anchor backing plate (10), an anchor seat plate (11), a pi-shaped piece sealing plate (12), an anchor side plate vertical rib plate (13), a panel (14), a tooth-shaped plate (16), a middle beam upper flange plate (17.1), a middle beam lower flange plate (17.2), a middle beam web plate (18), a first longitudinal and transverse stiffening plate (19), a second longitudinal and transverse stiffening plate (20), a tuyere partition plate (24), a middle beam connecting baffle plate (25) and a baffle embedding and reinforcing flange plate (26);

the operation steps of the step 3 are as follows:

step 3.1, selecting steel plates from a stock yard according to a plate arrangement diagram, checking plate numbers, and blanking by adopting a plasma numerical control gas cutting machine; the side bending of the plate after blanking is not more than 3mm, otherwise, the plate is adjusted before processing;

Step 3.2, drawing longitudinal central lines of the bottom plate U ribs (2) and the panel U ribs (15), making sample punching marks at two ends of the longitudinal central lines, and marking numbers at two ends of the bottom plate U ribs (2) and the panel U ribs (15);

step 3.3, drilling the panel U rib (15): drilling the panel U-shaped rib (15) by adopting a drill jig, wherein after the panel U-shaped rib (15) is drilled, the periphery of the hole is not concave-convex, and the flatness of the hole is required to be ensured;

step 3.4, milling grooves: milling grooves on a groove machine workbench on the plate of the bottom plate U rib (2) and the plate of the panel U rib (15);

step 3.5, pressing the U ribs (2) of the bottom plate and the U ribs (15) of the panel:

step 3.6, checking: cracks cannot be formed at bent round corners of the bottom plate U ribs (2) and the panel U ribs (15), on-site witness inspection is required when the first batch of bottom plate U ribs (2) and the panel U ribs (15) are processed, and at least 3 pieces of magnetic powder inspection is extracted to carry out full length inspection on a bent area; checking the cross section sizes of the bottom plate U rib (2) and the panel U rib (15) by adopting a U rib detection template (31);

the operation steps of the step 4 are as follows:

step 4.1, positioning and scribing: lifting the bottom plate (1) on a platform, drawing a datum line of the bottom plate (1), and drawing a positioning line of a U rib (2) of the bottom plate and a positioning line of a single element of the diaphragm;

Step 4.2, assembling the U ribs (2) of the bottom plate: compacting the U rib (2) of the bottom plate with the bottom plate (1) through a U rib profiling module of the movable assembly machine, performing code-free assembly after alignment, and performing spot welding positioning by adopting carbon dioxide gas shielded welding;

step 4.3, welding fillet weld of the U rib (2) of the bottom plate: placing the base plate unit element on an anti-deformation jig frame, and clamping and fixing the base plate unit element with the anti-deformation jig frame by adopting a hydraulic device; welding the bottom plate U rib (2) and the bottom plate (1) by adopting a 6-head double-wire U rib gantry welding machine;

step 4.4, correcting the single element of the base plate: checking the flatness of the single element of the bottom plate, and correcting the part by flame;

step 4.5, checking and marking the single element of the bottom plate: hanging the single element of the bottom plate on an inspection platform, and inspecting the length, width, diagonal difference, welding quality and flatness of the single element of the bottom plate; the qualified single elements are marked and then transferred to storage;

the operation steps of the step 5 are as follows:

step 5.1, positioning and scribing: hanging the diaphragm plate (3) on a horizontal jig frame, and marking a positioning line of the diaphragm plate longitudinal and transverse stiffening plates (4);

step 5.2, installing the transverse stiffening plates (4) of the transverse partition plate in a line, and measuring the assembly clearance and verticality; assembling the manhole and the pipeline hole reinforcement ring (5) in two sections, and tightly attaching the edges of the holes; adopting carbon dioxide gas shielded automatic welding to weld welding seams of all parts; firstly, upper and lower flange plates are assembled and welded with the flange plates;

Step 5.3, correcting the diaphragm plate single element: checking the flatness of the single element of the diaphragm plate, and correcting the flatness locally by flame;

step 5.4, hanging the diaphragm plate single element on an inspection platform, and inspecting the length, width, diagonal difference, welding quality and flatness of the diaphragm plate single element; the qualified single elements are marked and then transferred to storage;

the operation steps of the step 6 are as follows:

step 6.1, positioning and scribing: lifting the inner web (6) on a platform, and scribing an assembly line of the inner web plate ribs (7), a diaphragm plate single element positioning line and an inspection line;

step 6.2, assembling the inner web plate ribs (7): installing the inner web plate ribs (7) on the lines and performing positioning welding to control the verticality of the installation of the inner web plate ribs (7); the inner web single element is arranged on a hydraulic reverse deformation jig frame for welding;

step 6.3, correcting the inner web single element: checking the flatness of the inner web single element, and correcting the flatness locally by flame;

step 6.4, checking and marking the inner web single element: hanging the inner web single element on an inspection platform, and inspecting the length, width, diagonal difference, welding quality and flatness of the single element; the qualified single elements are marked and then transferred to storage;

the operation steps of the step 7 are as follows:

step 7.1, manufacturing an outer web single element (8): the manufacturing method is consistent with that of the inner web single element;

7.2, drawing a central line of an anchor side plate (9) and an assembly positioning line of a pi-shaped part on the non-structural side of the outer web single element (8), and checking;

step 7.3, assembling an anchor side plate (9) on the anchor backing plate (10) and spot-welding to form an n-shaped component;

step 7.4, assembling the pi-shaped component on the non-structural side of the side web single element (8) in a line, welding structural welding seams of the pi-shaped component and the web, wherein the welding seams are penetration welding seams, and performing nondestructive detection after welding;

7.5, installing and welding an anchor base plate (11) on an anchor base plate (10) of the pi-shaped component, firstly welding a full-circle fillet weld of the anchor base plate (11) and the anchor base plate (10) on the inner ring, and then welding three-side girth welds on the outer side;

step 7.6, welding vertical welding seams of the anchor backing plate (10) and the anchor side plate (9);

step 7.7, welding a pi-shaped piece sealing plate (12) on the pi-shaped component;

step 7.8, assembling and welding vertical rib plates (13) of the anchor side plates, namely sequentially withdrawing from the near web plate side for assembling and welding;

the operation steps of the step 8 are as follows:

step 8.1, positioning and scribing: hanging the panel (14) on a platform, drawing a datum line of the panel (14), and drawing a positioning line of a U rib (15) of the panel and a positioning line of a tooth-shaped plate (16);

step 8.2, assembling the panel U rib (15): compacting the panel U rib (15) and the panel (14) through a U rib profiling module of the movable assembly machine, performing code-free assembly after alignment, and performing spot welding positioning by adopting carbon dioxide gas shielded welding;

Step 8.3, welding the fillet weld of the U rib (15) of the panel: placing the panel unit element on a reverse deformation jig frame, and clamping and fixing the panel unit element with the jig frame by adopting a hydraulic device; welding the panel U ribs (15) by adopting a 6-head double-wire U rib gantry welding machine;

step 8.4, single element correction: checking the flatness of the single element of the panel, and correcting the flatness locally by flame;

step 8.5, welding the tooth-shaped plate (16): assembling a toothed plate (16) according to the scribing, measuring the perpendicularity and the assembling clearance between the toothed plate (16) and the panel (14), welding fillet welds between the toothed plate (16) and the panel (14) and between the toothed plate and the U-shaped rib (15) of the panel, and performing secondary correction and newspaper inspection after welding;

step 8.6, inspecting and marking the panel unit elements: hanging the panel unit on an inspection platform, and inspecting the length, width, diagonal difference, welding quality and flatness of the unit; the qualified single elements are marked and then transferred to storage;

the operation steps of the step 9 are as follows:

step 9.1, welding an upper flange plate (17.1) of the middle beam and a lower flange plate (17.2) of the middle beam: assembling a middle beam upper flange plate (17.1) and a middle beam lower flange plate (17.2) on a plane jig frame according to the figure, measuring the assembly clearance and verticality between a middle beam web plate (18) and the middle beam upper flange plate (17.1) and the middle beam lower flange plate (17.2), and performing cantilever submerged arc automatic welding;

Step 9.2, correcting the cross beam: flame straightening is adopted;

9.3, re-installing the jig frame after correction is finished, drawing an assembly line and an inspection line of the longitudinal and transverse stiffening ribs (19) on the middle beam web (18), installing the longitudinal and transverse stiffening plates (19) in a line manner, measuring the assembly gap and the perpendicularity between the longitudinal and transverse stiffening plates (19) and the middle beam web (18), and fixing by positioning welding;

step 9.4, turning over and assembling a longitudinal and transverse stiffening plate (20) on the other side, and finishing welding; then turning over again to weld the welding seams of the front longitudinal and transverse stiffening plates (19);

step 9.5, single element secondary correction: carrying out flame correction on the out-of-tolerance part;

step 9.6, drilling holes in the middle beam web (18) and the middle beam lower flange plate (17.2): adopting a sleeve die for drilling in order to ensure the hole position precision;

the operation steps of step 10 are as follows:

step 10.1, manufacturing a tuyere panel unit element (21), a tuyere bottom plate unit element (22) and a tuyere side plate unit element (23): the manufacturing method is consistent with that of the inner web single element;

step 10.2, positioning a horizontal jig frame on a single element (22) of the tuyere bottom plate;

step 10.3, positioning a jig frame on the tuyere partition plate (24), checking the verticality of the partition plate (24) and the bottom plate (22), and temporarily supporting and stabilizing;

Step 10.4, positioning a jig frame on the tuyere side plate (23);

step 10.5, positioning a jig frame on a tuyere panel (21), and after the assembly is completed, firmly spot-welding all welding seams;

step 10.6, welding the welding seam of the tuyere stock (24) and the tuyere bottom plate single element (22); turning over to form a tuyere panel unit piece (21) downwards, welding a tuyere partition plate (24) with the tuyere panel unit piece (21) and a tuyere side plate unit piece (23), and finally welding a tuyere side plate unit piece (23) with the tuyere panel unit piece (21) and a tuyere bottom plate unit piece (22);

step 10.7, flaw detection, correction and report detection are carried out in the next procedure;

the operation steps of step 11 are as follows:

step 11.1, calculating elevation values of the templates of the jig frames according to design line types, monitoring data values and inverse deformation empirical values;

step 11.2, setting up a jig frame according to a steel box girder total splicing jig frame diagram;

step 11.3, positioning identification setting: marking a marking line for positioning each element, a steel box girder center positioning line, a girder section center line, an angle positioning control line and the like on the ground of a jig frame area by utilizing the cooperation of a total station;

the operation of step 12 is as follows:

Step 12.1, the base plate unit elements comprise base plate reference unit elements and adjacent base plate unit elements, and the base plate reference unit elements D1 and the base plate reference unit elements D4 are positioned on the jig frame;

step 12.2, positioning the adjacent bottom plate single element D2, the adjacent bottom plate single element D3, the adjacent bottom plate single element D5, the adjacent bottom plate single element D6 and the adjacent bottom plate single element D7 in sequence on the ground sample line by taking the central line of the bridge as a reference, and welding the bottom plate longitudinal seams in sequence;

step 12.3, after all the bottom plate unit elements on the two sides are installed and inspected, positioning and fixing a diaphragm plate unit element HG1 and a diaphragm plate unit element HG2 of a left box chamber and a right box chamber of the steel box girder, and assembling a diaphragm plate embedded flange plate (26);

12.4, positioning the inner web single element (27) and the upper jig frame of the middle beam connecting partition plate (25);

step 12.5, positioning the anchor box unit piece (28): after the anchor box unit elements (28) are assembled in place, butt welding seams of the diaphragm plate unit elements HG1 and the diaphragm plate unit elements HG2 are sequentially welded, and butt welding seams of the diaphragm plate unit elements HG1, the diaphragm plate unit elements HG2 and the embedded flange plates (26) are welded; then welding the fillet of the inner web unit piece (27) and the diaphragm unit piece HG2, welding the fillet of the inner web unit piece (27) and the middle beam connecting diaphragm (25), welding the fillet of the anchor box unit piece (28) and the diaphragm unit piece HG1, welding the fillet of the anchor box unit piece (28) and all the bottom plate unit pieces, welding the fillet of the inner web unit piece (27) and the adjacent bottom plate unit piece D7, and welding the fillet of the diaphragm unit piece HG1, the diaphragm unit piece HG2 and all the bottom plate unit pieces;

Step 12.6, positioning the jig on the panel reference unit: sequentially welding fillet welds of the inner web unit piece (27), the anchor box unit piece (28) and the reference panel unit piece M1, the reference panel unit piece M7, then sequentially positioning the adjacent panel unit piece M2, the adjacent panel unit piece M3, the adjacent panel unit piece M4, the adjacent panel unit piece M5, and the adjacent panel unit piece M6, welding the butt longitudinal seam of the reference panel unit piece M1 and the adjacent panel unit piece M2, welding the butt longitudinal seam of the adjacent panel unit piece M2 and the adjacent panel unit piece M3, welding the butt longitudinal seam of the adjacent panel unit piece M3 and the adjacent panel unit piece M4, welding the butt longitudinal seam of the adjacent panel unit piece M4 and the adjacent panel unit piece M5, welding the butt longitudinal seam of the adjacent panel unit piece M5 and the adjacent panel unit piece M6, and the reference panel unit piece M7;

12.7, welding the welding seams of the toothed plate (16) and the inner web single element (28), the diaphragm single element HG1 and the diaphragm single element HG2 in sequence, and welding the butt seam of the toothed plate (16) per se;

12.8, positioning and fixing the single element (29) of the middle beam, welding a panel butt welding seam, then matching drilling holes on connecting plates of a web plate (18) of the middle beam and a lower flange plate (17.2) of the middle beam, derusting and aluminizing the drilled connecting plates, and then mounting high-strength bolts on a jig frame again; the middle beam single element (29) is positioned and the bolt group is derusted, sprayed with aluminum and protected;

Step 12.9, preparing high-strength bolt holes of a middle beam web plate (18) and a middle beam lower flange plate (17.2): connecting and fixing a middle beam web plate (18) and a middle beam lower flange plate (17.2) by adopting a connecting plate, a locating pin and a common bolt, performing ink hole on a hole group on one side of the connecting plate, which is not drilled, of an ink hole device, removing the connecting plate, drilling the connecting plate on a rocker arm drill, marking the connecting plate, resetting the connecting plate after drilling, primarily screwing a torque wrench, welding flange butt welding seams, and finally screwing in place;

step 12.10, assembling and welding a three-dimensional single element (30) of the tuyere;

step 12.11, beam segment correction: after the main structure of the beam section is welded, the beam Duan Yaoshu is released;

step 12.12, correcting the position: free plate edges at two ends of the beam section are deformed in a wave mode, staggered edges of the port plates are matched, and longitudinal welding seam angles are deformed; the angle points of the beam section ports are out of tolerance, and the height line shape of the free edge is poor;

correction means: the baking gun and the matched tool are adopted to correct the fire in the place to be corrected,

step 12.11, installing matching accessory facilities on the line according to the graph;

step 12.12, segment control point placement and protection: after all the sections of each round are constructed and inspected to be qualified, positioning marks and marks are manufactured at the positions of the left compartment chamber, the right compartment chamber, the middle cross beam and the ports of the adjacent sections, and the positioning marks and the marks are protected by adhesive tapes; then, the other sections enter the coating and storing procedures except the reserved sections of the lower wheel preassembled;

Step 12.13, retesting the jig frame: and adjusting the template line shape of the assembly jig frame according to the design line shape, and fixing the last section in the previous round of assembly construction on the jig frame to serve as a reference section, and sequentially carrying out assembly construction of adjacent subsequent sections.