CN107794834B - Large-section steel box girder framing matching structure and manufacturing method - Google Patents
Large-section steel box girder framing matching structure and manufacturing method Download PDFInfo
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- CN107794834B CN107794834B CN201710794525.0A CN201710794525A CN107794834B CN 107794834 B CN107794834 B CN 107794834B CN 201710794525 A CN201710794525 A CN 201710794525A CN 107794834 B CN107794834 B CN 107794834B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 87
- 239000010959 steel Substances 0.000 title claims abstract description 87
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 238000009432 framing Methods 0.000 title claims abstract description 18
- 238000003466 welding Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 238000005192 partition Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000013461 design Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention relates to a large-section steel box girder framing matching structure which can adapt to the width change of a steel box girder and ensure the total splicing of the steel box girder and the manufacturing quality and a manufacturing method thereof, wherein the diagonal bracing of a steel box girder total splicing jig frame is designed into 3 groups, the diagonal bracing in each group is connected into an integral diagonal bracing frame through a tie rod, the lower ends of three diagonal bracing at the lower ends of two sets of integral diagonal bracing frames are respectively connected with a cross beam, a cross beam at the bottom of the diagonal bracing is provided with a sliding device with anti-overturning function, and meanwhile, the bottom of the diagonal bracing is provided with a pin locking device. The advantages are that: a brand new large-section steel box girder framing matching manufacturing technology is formed, and the technology can meet the manufacturing requirements of the widened steel box girders, so that the precision of matching manufacturing of the steel box girders is ensured, and the manufacturing quality of the steel box girders is also ensured.
Description
Technical Field
The invention relates to a large-section steel box girder framing matching structure and a manufacturing method, which not only can adapt to the width change of a steel box girder, but also can ensure the total assembly of the steel box girder to be smoothly carried out and the manufacturing quality, and belongs to the field of manufacturing of steel bridges.
Background
The current ultra-large engineering promotes the crossing development of the manufacture of the steel bridge in China, the steel box girder of the bridge channel bridge adopts a separated double-box section, and the two steel box girders are connected into a whole through a cross beam, and the steel box girder is designed to be of a widened structure due to the construction requirement, and the standard section length of the steel main girder is 12.5m. According to the hoisting scheme, the large-section steel box girder is manufactured on a total splicing site, the length of the large-section steel box girder can reach more than 60m, and the weight of the large-section steel box girder is about 1200t. In the past, most steel box girders are single-box multi-chamber structures with equal width, all adopt 'plate units → small-section steel girders → large-section steel girders', are difficult to adapt to the requirement of steel box girder width change, and simultaneously, the adoption of an integral manufacturing scheme can lead to the fact that a cross beam between two steel box girders can not be installed, and the transportation cost of the steel box girders can be greatly increased due to overlarge weight. Therefore, a steel box girder framing large-section manufacturing technology is developed, a whole matching assembly scheme is adopted for ensuring the matching relation between two girder sections, namely, the two girder sections are manufactured on a whole jig frame at the same time, a certain gap is arranged between the two girder sections for facilitating large-section tire discharging, the technology ensures the manufacturing quality of the steel box girder, and the production efficiency is also improved.
Disclosure of Invention
The design purpose is as follows: the large-section steel box girder framing matching structure and the manufacturing method thereof are designed to avoid the defects in the background art, not only can adapt to the width change of the steel box girder, but also can ensure the total assembly of the steel box girder to be smoothly carried out and the manufacturing quality to be ensured.
The design scheme is as follows: in order to achieve the above design objective. The invention develops a steel box girder framing large-section manufacturing technology, adopts a whole matching assembly scheme for ensuring the matching relation between two girder sections, namely the two girder sections are simultaneously manufactured on a whole jig frame, and a certain gap is arranged between the two girder sections for facilitating the large-section tire discharging.
Technical scheme 1: the large-section steel box girder framing matching structure comprises 3 diagonal braces of a steel box girder general splicing jig frame, wherein each diagonal brace is connected into an integral frame through a tie rod, a sliding device with anti-overturning function is arranged at the bottom of the diagonal brace and the jig frame, and a pin locking device is arranged at the bottom of the diagonal brace. Secondly, pushing and sliding the diagonal bracing of the total jig frame to a design position according to the width of the steel box girder, temporarily locking by adopting pins, and then assembling the steel box girder. According to the method, 2 movable cross beams are arranged under each beam section due to the adoption of the framing large-section manufacturing scheme, so that the transfer requirement of the steel box girder is met.
Technical scheme 2: in order to ensure the matching precision between the large-section steel box girder frames and the difficult problem of large-section transportation jig frame, connecting cross beams are firstly manufactured in a factory in a matching way, and meanwhile, matching parts are adopted to connect into a whole and are transported to a steel box girder assembly site as a single element. The method comprises the steps of (1) firstly, preparing steel box girders in a framing manner, hoisting connecting beams, adding delta mm cushion blocks between temporary matching pieces according to a gap delta between two steel box girders, assembling and welding the connecting beams, and then transporting a jig frame by the steel box girders).
Compared with the background technology, the invention forms a brand new large-section steel box girder framing matching manufacturing technology, which can meet the manufacturing requirements of the widened steel box girders, ensure the precision of the matching manufacturing of the steel box girders and ensure the manufacturing quality of the steel box girders.
Drawings
FIG. 1 is a wide steel box girder total jig frame (1-1 in the figure represents a steel box girder total jig frame cross beam, 1-2 represents diagonal braces of the total jig frame, and 1-3 represents connecting tie bars between the diagonal braces).
Fig. 2-1 is a schematic view of the left half of the steel box girder connection cross-member.
Fig. 2-2 is a schematic view of a temporary mating member for a connecting beam.
Fig. 3-1 is a schematic view of a split double section steel box girder (without a connecting beam installed).
FIG. 3-2 is a schematic illustration of matched fabrication of a large section steel box girder.
Fig. 3-3 are half-width large section steel box girders.
Detailed Description
Example 1: reference is made to figure 1. The frame matching structure of large-section steel box girders is characterized in that the diagonal braces 1-2 of the general splicing jig frame of the steel box girders are designed into 3 groups, the diagonal braces 1-2 in each group are connected into an integral diagonal brace frame through tie bars 1-3, the lower ends of three diagonal braces at the lower ends of two sets of integral diagonal brace frames are respectively connected with a cross beam 1-1, a cross beam at the bottom of each diagonal brace 1-2 is provided with a slip device with anti-overturning (the slip device with anti-overturning belongs to the prior art in a steel structure and is not described in detail), and meanwhile, the bottom of each diagonal brace is provided with a pin locking device (the pin locking device is a common temporary fixing mode and is not described herein). The width of the steel box girder is that the diagonal bracing of the total jig frame is pushed and slipped to a designed position, and the steel box girder can be assembled after temporary locking by adopting pins. Because of adopting the large-section manufacturing scheme of framing, 2 movable cross beams are arranged under each beam section (each beam section is a single-box section beam section formed by cutting a plurality of separated double-box section steel box girders from the middle), so as to meet the transportation requirement of the steel box girders. The beam section with longer length is formed by a plurality of half steel box beams of separated double-box section steel box beams.
Example 2: on the basis of example 1, reference is made to fig. 2 and 3. Fig. 2-1 is a schematic view of a left half part of a connecting beam of a steel box girder, and fig. 2-2 is a schematic view of a temporary matching piece of the connecting beam; fig. 3-1 is a schematic view of a split type double-section steel box girder (without connecting cross beams), fig. 3-2 is a schematic view of matched manufacture of a large-section steel box girder, and fig. 3-3 is a half-width large-section steel box girder.
Step 1: before the board unit is put on the jig frame, the part number of the board unit is checked first, and the outline dimension is checked, so that the assembly position of the board unit is ensured to be accurate.
Step 2: the width of the overall jig frame is adjusted according to the width of the steel box girder, which is "steel box girder width + delta" ('delta') is a distance determined between two large section steel girders to ensure the assembly space.
Step 3: and hoisting the bottom plate unit to a total jig frame, performing initial positioning by taking the middle measuring tower as a reference, then connecting the 1# bottom plate unit and the 2# bottom plate unit, and performing assembly welding on the 3# plate unit and the 1# two jig plate units and the 2# two jig plate units.
Step 4: after the whole base plate unit is connected with the width, the position of the base plate unit is accurately adjusted, the longitudinal base line of the base plate unit and the base line of the middle measuring tower are ensured to be on the same straight line, and meanwhile, the interval between the transverse base lines of all the whole base plate units is required to be 'set +5'.
Step 5: after the whole bottom plate is lengthened, correcting the base line of the beam Duan Heng, requiring the interval between each two transverse base lines to be 'set +2', and then marking out the position line of the transverse partition plate; when the total length of the bottom plate is required to be 'set to be +12mm' (which means theoretical dimension + mm on a construction drawing) to correct the base line, the same section should be ensured to be collinear with the transverse base line and parallel with the longitudinal base line.
Step 6: and sequentially assembling the edge web units of the beam section, and positioning the edge web units by using the edge measuring tower. It should be noted that the longitudinal and transverse process allowance is considered when the inclined web plates are assembled, and the shrinkage of transverse welding is reserved according to the 'set +2' (the theoretical dimension +2mm on the construction drawing).
Step 7: and assembling diaphragm plate units of the beam sections, and positioning and welding the diaphragm plates and the web plates (the length is not less than 500 mm) after the diaphragm plates and the web plates are qualified in positioning and detection by taking the middle measuring tower as a reference during positioning.
Step 8: and assembling the middle web plate unit, and mainly controlling the matching precision of the box opening of the connecting beam.
Step 9: and integrally hoisting the connecting cross beams, opening the matching parts on the connecting cross beams after the connecting cross beams are in place, then adding cushion blocks with delta mm between the matching parts, and temporarily connecting the matching parts.
Step 10: and after the connecting cross beam is welded, removing the temporary matching piece to form the large-section steel box girder.
Step 11: and (3) firstly conveying the half-width large-section steel box girders out of the total jig frame by adopting a girder moving flatcar, and then conveying the other half-width large-section steel box girders out of the jig frame.
It should be understood that: although the above embodiments describe the design concept of the present invention in more detail, these descriptions are merely descriptions of the design concept of the present invention, and not limitations on the design concept of the present invention, and any combination, addition or modification not exceeding the design concept of the present invention falls within the scope of the present invention.
Claims (4)
1. A large-section steel box girder framing matching structure is characterized in that: the diagonal braces (1-2) of the steel box girder general splicing jig frame are designed into 3 groups, the diagonal braces (1-2) in each group are connected into an integral diagonal brace frame through tie bars (1-3), the lower ends of three diagonal braces at the lower ends of two sets of integral diagonal brace frames are respectively connected with the cross beams (1-1), the cross beams at the bottoms of the diagonal braces (1-2) are provided with anti-overturning sliding devices, and meanwhile, the bottoms of the diagonal braces are provided with pin locking devices; the manufacturing method comprises the following steps:
step 1: before the jig frame is arranged on the plate unit, firstly checking the part number of the plate unit, checking the external dimension, and ensuring the assembly position of the plate unit to be accurate;
step 2: the width of the total jig frame is adjusted according to the width of the steel box girder, and the width is 'steel box girder width plus delta';
step 3: hoisting the bottom plate unit to a total jig frame, performing initial positioning by taking a middle measuring tower as a reference, then widening the 1# bottom plate unit and the 2# bottom plate unit, and performing assembly welding on the 3# plate unit and the 1# two jig plate units and the 2# two jig plate units;
step 4: after the whole base plate unit is connected with the width, the position of the base plate unit is accurately adjusted, the longitudinal base line of the base plate unit and the base line of the middle measuring tower are ensured to be on the same straight line, and meanwhile, the interval between the transverse base lines of all the whole base plate units is required to be 'set to be +5mm';
step 5: after the whole bottom plate is lengthened, correcting the base line of the beam Duan Heng, requiring the interval between each two transverse base lines to be 'set to +2mm', and then marking out the position line of the transverse partition plate; the total length of the bottom plate is required to be ensured to be 'set to be +12mm', and the same section of left and right transverse baselines are required to be ensured to be collinear and longitudinal baselines are required to be parallel when the baselines are corrected;
step 6: the side web units of the beam sections are assembled in sequence, the side measuring towers are utilized to position the side web units, the longitudinal and transverse process allowance is considered when the inclined web is assembled, and the transverse welding shrinkage is reserved according to the 'setting +2mm' of half width;
step 7: assembling diaphragm plate units of the beam sections, and positioning and welding the diaphragm plates and the web plates to a length of not less than 500mm after the diaphragm plates and the web plates are qualified by positioning and detection by taking a middle measuring tower as a reference during positioning;
step 8: assembling the middle web unit, and mainly controlling the matching precision of the box opening of the connecting beam;
step 9: integrally hoisting the connecting cross beam, opening the matching parts on the connecting cross beam after the connecting cross beam is in place, adding cushion blocks with delta mm between the matching parts, and temporarily connecting the matching parts;
step 10: after the connecting beam is welded, the temporary matching piece is removed to form a large-section steel box girder;
step 11: and (3) firstly conveying the half-width large-section steel box girders out of the total jig frame by adopting a girder moving flatcar, and then conveying the other half-width large-section steel box girders out of the jig frame.
2. The large-section steel box girder framing matching structure according to claim 1, characterized in that: the width of the steel box girder is that the diagonal bracing of the total jig frame is pushed and slipped to a designed position, and the steel box girder can be assembled after temporary locking by adopting pins.
3. The large-section steel box girder framing matching structure according to claim 1, characterized in that: because of adopting the large-section manufacturing scheme of framing, 2 movable cross beams are arranged under each beam section so as to meet the transportation requirement of the steel box girder.
4. A large section steel box girder framing matching structure according to claim 3, characterized in that: each beam section is a single-box section beam section formed by cutting a plurality of separated double-box section steel box beams from the middle.
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| CN201710794525.0A CN107794834B (en) | 2017-09-06 | 2017-09-06 | Large-section steel box girder framing matching structure and manufacturing method |
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| CN107794834A CN107794834A (en) | 2018-03-13 |
| CN107794834B true CN107794834B (en) | 2023-10-27 |
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| CN110847062A (en) * | 2019-11-27 | 2020-02-28 | 中交一公局第六工程有限公司 | Construction method for whole-hole assembly double-width erection in 80-meter-span wide steel box girder factory |
| CN111254835A (en) * | 2020-02-18 | 2020-06-09 | 中交路桥建设有限公司 | Continuous matching construction method for steel box girder segments in factory |
| CN111926705A (en) * | 2020-05-08 | 2020-11-13 | 江苏中铁山桥重工有限公司 | Method for integrally assembling ultra-wide framing steel box girder |
| CN111576188A (en) * | 2020-05-14 | 2020-08-25 | 上海市政工程设计研究总院（集团）有限公司 | Steel construction bridge antidumping structure |
| CN111975278B (en) * | 2020-10-26 | 2021-06-04 | 中铁隧道局集团路桥工程有限公司 | Splicing welding jig frame for steel box girder and splicing welding process thereof |
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