CN114319121A - Long and large steel box girder segment linear control method - Google Patents
Long and large steel box girder segment linear control method Download PDFInfo
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Abstract
The invention relates to a long and large steel box girder segment linear control method which can ensure the hoisting quality of long and large segments and improve the production efficiency. The advantages are that: the method can meet the manufacturing requirements of the long and large steel box girders with curves of different radiuses, not only ensures the manufacturing precision of the curved steel box girders, but also can improve the manufacturing efficiency of the long and large steel box girder segments; secondly, the process is simple, the practicality is strong, applicable in other structure steel box girders, is worth promoting.
Description
Technical Field
The invention relates to a long and large steel box girder segment linear control method which can ensure the hoisting quality of long and large segments and improve the production efficiency.
Background
CN102433841A, name "a dysmorphism curve steel box girder installation method", include the following step: step 1, manufacturing each section of the steel box girder, pre-assembling, measuring the cross section of the steel box girder at a distance of 300mm in the pre-assembling process, recording data, analyzing the average value of transverse shrinkage of welding, and compensating each section of the steel box girder in size; step 2, erecting a temporary support to form a temporary buttress, wherein the temporary buttress adopts a full support and comprises a scaffold, a cross brace and transverse I-steel; safety protective nets are respectively arranged on the periphery, the middle part and the lower part of the frame body of the temporary support, and safety protective railings are erected at the top of the frame body; paving a pedestrian passageway and a web welding working platform along the bridge direction from the web edge of the steel box girder to the edge of the guard rail; adjusting the jacking of the temporary support, and setting the pre-camber according to a secondary parabola; step 3, firstly, measuring and positioning on the bridge pier, then hoisting the steel box girder on the bridge pier, controlling the hoisting and positioning of the curve main box girder, and then integrally measuring and adjusting the installed steel box girder; wherein the measurement positioning specifically comprises: 1) controlling the axis of the curved steel box girder: firstly, paying out an axis and a bridge center line on a pier; when the steel box girder is assembled and manufactured, the central line and the axis of the bridge are released, and after welding, each line is rechecked and marked; when the steel box girder is hoisted in place and is 50mm away from the support, the steel box girder is adjusted to ensure that the central line and the axis on the steel box girder correspond to each line on the pier; rechecking the contact ratio of each line, and putting down the steel box girder after installing limit codes on four sides of the support; 2) controlling the elevation of the steel box girder: calculating the elevation of each supporting point at each temporary bridge pier, and rechecking the elevation of the steel box girder at each supporting point; 3) controlling the central line and the front and rear positions of the curved steel box girder: the center line of the steel box girder is released on the temporary bridge pier, and the center line of the steel box girder is aligned when the steel girder is hoisted and positioned; the distance is adjusted by taking the central line of the steel box girder as a reference, and two girder bodies on the same steel box girder are constructed at the same time; step 4, welding all sections of the steel box girder and controlling the deformation of the welding; and 5, carrying out local line adjustment on the steel box girder. The patent mainly introduces the pre-splicing and positioning of the special-shaped curve steel box girder, and is irrelevant to the linear control of the long and large curve steel box girder.
CN103084806A entitled method for manufacturing large curved steel box girder, which utilizes AUTOCAD or SOLIDWORK three-dimensional software to perform solid modeling, accurately lofting the box opening and the position of a partition plate of each section, computer simulation pre-assembly, manufacturing a transverse partition plate, a top plate, a web plate, a bottom plate and a reference block according to the solid lofting of the computer, manufacturing the section at the curved part on a linear assembly jig, temporarily not cutting two short sides when manufacturing a single section, scribing and cutting the two short sides after the whole assembly welding of the section is finished, performing flat pre-assembly on the assembly jig, additionally arranging an adjusting matching piece at the section interface, filling the gap after the short sides are cut, realizing the linear manufacturing of the curved steel box girder, manufacturing the section at the curved part on the linear assembly jig, and in the pre-assembly, because the gap values of the sections have larger difference, in order to ensure the accurate matching when erecting the bridge, adjust through adjustment matching spare, adjustment matching spare for corresponding the setting draw the ear and be used for filling the baffle in clearance on two adjacent sections, the baffle pass through the round pin axle and adjacent section draw the ear to be connected, the baffle size confirm according to the size in clearance. The patent aims at manufacturing a small-section steel box girder and is irrelevant to linear control of a long and large curve steel box girder.
Disclosure of Invention
The design purpose is as follows: the long and large steel box girder segment linear control method is designed, which can ensure the hoisting quality of the long and large segments and improve the production efficiency, thereby forming a manufacturing technology of the long and large steel box girder.
The design scheme is as follows: the common hoisting method for the large-span steel box girder bridge mainly comprises a sectional hoisting method, an integral hoisting method, a pushing method, a cantilever splicing method, a high-altitude sliding method and the like. Different installation methods are determined according to comprehensive consideration in the aspects of structural characteristics, site requirements, construction level, project progress requirements, economy and the like.
The large and large segment integral hoisting method is a construction method that the units manufactured by segments are firstly assembled into a whole on a jig frame on the ground, and then hoisted to the designed elevation position by hoisting equipment and fixed. The integral hoisting construction method does not need a tall assembling support, reduces overhead operation, ensures construction safety and connection quality, but needs hoisting equipment with large hoisting capacity.
The large-section hoisting scale is large, the transport tonnage is large, the large-section hoisting method is suitable for sea-crossing or coastal bridges, and the large-section hoisting method is mostly used for steel box continuous beams at present.
The line shape of the long and large segment comprises a design line shape, a manufacturing line shape, an installation line shape and a bridge forming line shape, and the line shape is very complicated due to the fact that a horizontal and vertical curve and pre-camber of the bridge design are additionally added, so that a theoretical line model is often established according to a design drawing, and the contour size, the included angle and the like of each small segment contained in the large segment are calculated through geometric relation calculation or software in combination with a reference line model for manufacturing the line shape; the conditions of bridge site environment, equipment and the like are limited, the linear adjusting capacity is limited, units forming a large section are more in sections, intensive in welding seams, more in working procedures and large in geometric outline, and the linear control precision of the large section in the stages of unit, small section, large section, storage and transportation is ensured to meet the target requirement through a series of measures such as processes, jigs and measurement and control means.
The technical scheme is as follows: a long and large steel box girder segment linear control method comprises the following steps: (1) checking the working condition and the line shape: the line shape of the long and large-segment steel box girder is closely related to the erection and installation method thereof, and the line shape difference is large due to different schemes such as large-segment hole hoisting, large-segment pushing, small-segment splicing and pushing and the like; meanwhile, the long and large section steel box girder has different line shapes in different construction stages, such as design theory line shape, manufacturing line shape, installation monitoring line shape, bridge forming line shape and the like, so that various line shapes of the long and large section can be correctly distinguished, confusion is prevented, and the installation can not meet the acceptance requirement.
(2) Theoretical linear lofting and rechecking: and drawing the horizontal, vertical and horizontal sections in sequence according to the circuit design parameters.
(3) And (3) lofting of the reference line die: and drawing a reference line die outline (generally the central section of the steel box girder) according to the stress-free line shape of the long and large segment in the manufacturing stage calculated by a specific erection scheme.
(4) And (3) calculating the actual size of the unit: and accurately calculating the geometric dimension of each unit element including the outer contours of the top plate, the bottom plate and the web plate by using drawing geometry or software according to the reference line model and the theoretical line model.
(5) Unit element manufacturing accuracy control: the theoretical size calculated is adopted during the unit element manufacturing, and meanwhile, the geometric size precision is controlled by combining the process quantity (welding, correcting and trimming time).
(6) And (3) controlling the manufacturing precision of the small segment: the jig frame suitable for the horizontal and vertical curve change of the long and large segment steel box girder is designed, and the overall horizontal and vertical line shape of the long and large segment is controlled through reasonably planning the assembly process.
(7) And (3) controlling the manufacturing precision of the large section: designing a longitudinal and transverse positioning device, selecting methods of positioning of a reference section, resetting, assembly welding, rechecking and the like of other sections in sequence, and combining an applicable measurement and control method to ensure that the extension line shape of the large section meets the requirement.
(8) Transferring and storing: the long and large sections are large in size, heavy in weight and weak in local rigidity, the problem of local stress in the transferring and storing process of the long and large sections is solved, the transferring and supporting positions are reasonably designed, and the transferring and storing stage is linear.
(9) On-site large-section linear control: the long and large segment steel box girder on site usually adopts a positioning bracket and a pier top beam adjusting device to ensure that the erection line shape meets the requirement.
Compared with the prior art, the method can be suitable for the linear control requirements of the long and large steel box girders with different radius curves, the processes and key contents of the linear control of different stages of manufacturing and mounting of the steel box girders are clarified for the first time, and the linear of the long and large steel box girder sections can be effectively ensured to meet the corresponding acceptance requirements in the stages of drawing conversion, manufacturing (single element, small section and large section), bridge location mounting and the like; secondly, the process is simple, the practicality is strong, applicable in other structure steel box girders, is worth promoting.
Drawings
FIG. 1-1 is a schematic diagram of the line type (theoretical line).
Fig. 1-2 are schematic diagrams of the line type (manufacturing line).
Fig. 1-3 are schematic diagrams of the line type (bridgewire).
Fig. 2-1 is a schematic elevation of a box girder (extended centerline length).
Fig. 2-2 is a schematic plan projection of a box girder.
Fig. 2-3 are schematic cross-sectional views of box girders.
Fig. 3 is a schematic view of a reference line die (manufacturing line shape).
Fig. 4-1 is a schematic plan projection of the beam length.
FIG. 4-2 is a unit extrapolation diagram.
Fig. 5 is a unit-small segment schematic.
Fig. 6 is a schematic drawing of a large segment extension.
Fig. 7 is a schematic diagram of a large segment extension.
FIG. 8 is a schematic illustration of large segment transfer and temporary storage.
FIG. 9 is a schematic view of the erection of a large-section bridge site.
Detailed Description
Example 1: reference is made to fig. 1-9. A long and large steel box girder segment linear control method comprises the following steps:
step 1: method of erection and monitoring manufacturing line shape confirmation review
Step 2: design theory horizontal vertical sectioning line-shaped lofting and rechecking
And 3, step 3: monitoring manufacturing reference line mold lofting
And 4, step 4: calculating unit size by combining reference line model with theory horizontal and vertical dissection
And 5, step 5: unit manufacturing, emphasis on reserving process volume
And 6, step 6: the special solid bridge linear jig frame is designed, the reasonable design process ensures the manufacturing precision of small sections
And 7, step 7: small segment manufacturing line shape controlled by using measurement and control device, jig and combining unit element precision
And 8, step 8: the measurement and control ground sample is utilized to control the resetting and assembly welding precision of the reference small section and ensure the linear shape of the large section
Step 9: the supporting position is reasonably selected through stress calculation, and the line shape of the large segment in the transferring and storing process is ensured
Step 10: the bracket and pier top adjusting device is designed to ensure the line shape of large-section erection on site.
The following is further illustrated:
(1) checking the working condition and the line shape: the line shape of the long and large-section steel box girder is closely related to the erection and installation method thereof, different schemes such as whole hole hoisting of the large section, large-section pushing, pushing after assembly of small sections and the like cause larger line shape difference, and meanwhile, the long and large-section steel box girder has different line shapes in different construction stages (which refer to working conditions of different stages of various construction schemes), such as design theory line shape, manufacturing line shape, installation monitoring line shape, bridge forming line shape and the like, various line shapes of the long and large section are correctly distinguished, confusion is prevented, and installation cannot reach the acceptance requirement; and calculating and rechecking the confirmed line shape by using a design and monitoring unit, and lofting. Under different working conditions, different acceptance indexes exist.
(2) Theoretical linear lofting and rechecking: drawing a horizontal drawing, a vertical drawing and a sectional drawing in sequence according to the design parameters of the overall design circuit;
(3) and (3) lofting of the reference line die: drawing a reference line die outline at the central section of the steel box girder according to the stress-free line shape of the long and large segment manufacturing stage calculated by different construction scheme erection schemes;
(4) and (3) calculating the actual size of the unit: accurately calculating the geometric size of each unit element including the outer contours of the top plate, the bottom plate and the web plate by using drawing geometry or software according to the reference line model and the theoretical line model;
(5) unit element manufacturing accuracy control: the method is characterized in that the calculated theoretical size is adopted during the manufacturing of a unit element, and meanwhile, the geometric size precision control is carried out by combining the technological quantities of welding, correcting and trimming occasions (different welding and correcting methods have different technological quantities);
(6) and (3) controlling the manufacturing precision of the small segment: the jig frame suitable for the horizontal and vertical curve change of the long and large section steel box girder is designed so as to adjust and control the whole transverse position and elevation of the steel box girder, and the whole horizontal and vertical line shape of the long and large section meets the acceptance index requirements of section axes, elevation, diagonal lines and the like by reasonably planning the assembly welding sequence, opportunity and other assembly processes of various units.
(7) And (3) controlling the manufacturing precision of the large section: a longitudinal and transverse positioning device is designed, a section in the middle of a large section is selected as a reference section for positioning, and other sections are sequentially reset, assembled and welded, rechecked and the like, and an applicable measurement and control method is combined to ensure that the extension line shape of the large section meets the requirements.
(8) Transferring and storing: the long and large section has large size, heavy weight and weak local rigidity, the problem of local stress in the transferring and storing process of the long and large section is solved, a reinforcing structure is designed at the crossed part of the partition plate and the web plate of the box girder of the long and large section and is used as a supporting position for transferring, and the linear control of the transferring and storing stage is ensured to be within the deformation range.
(9) On-site large-section linear control: the on-site long and large section steel box girder is usually provided with a positioning bracket and a pier top beam adjusting device to ensure that the shape indexes such as plane position coordinates, elevation, axes and the like meet the acceptance requirements in the erection stage.
It is to be understood that: although the foregoing embodiments have described the design concept of the present invention in detail, these descriptions are only used for describing the design concept of the present invention in brief, and not for limiting the design concept of the present invention, and any combination, addition or modification that does not exceed the design concept of the present invention falls within the scope of the present invention.
Claims (1)
1. A long and large steel box girder segment linear control method is characterized by comprising the following steps:
(1) checking the working condition and the line shape: the line shape of the long and large-segment steel box girder is closely related to the erection and installation method thereof, different schemes such as whole hole hoisting of the large segment, large-segment pushing, splicing of small segments and pushing can cause larger line shape difference, and meanwhile, the long and large-segment steel box girder has different line shapes under different working conditions of construction stages, such as design theory line shape, manufacturing line shape, installation monitoring line shape, bridge formation line shape and the like, so that various line shapes of the long and large segment can be correctly distinguished, confusion is prevented, and the installation can not reach the acceptance requirement;
(2) theoretical linear lofting and rechecking: drawing a horizontal drawing, a vertical drawing and a sectional drawing in sequence according to the design parameters of the overall design circuit;
(3) and (3) lofting of the reference line die: drawing a reference line die outline at the central section of the steel box girder according to the stress-free line shape of the long and large segment manufacturing stage calculated by different construction scheme erection schemes;
(4) and (3) calculating the actual size of the unit: accurately calculating the geometric size of each unit element including the outer contours of the top plate, the bottom plate and the web plate by using drawing geometry or software according to the reference line model and the theoretical line model;
(5) unit element manufacturing accuracy control: the method is characterized in that the geometric dimension precision is controlled by adopting the calculated theoretical dimension and combining the welding, correcting and trimming time process quantities during the unit element manufacturing;
(6) and (3) controlling the manufacturing precision of the small segment: designing a jig frame which is suitable for the horizontal and vertical curve change of the long and large section steel box girder so as to adjust and control the whole transverse position and elevation of the steel box girder, and reasonably planning the assembly welding sequence, the opportunity and other assembly processes of various units to ensure that the whole horizontal and vertical line shape of the long and large section meets the acceptance index requirements of the section such as axis, elevation, diagonal and the like;
(7) and (3) controlling the manufacturing precision of the large section: designing a longitudinal and transverse positioning device, selecting a section in the middle of a large section as a reference section for positioning, sequentially resetting, assembling and welding the rest sections, rechecking and the like, and combining an applicable measurement and control method to ensure that the elongated shape of the large section meets the requirement;
(8) transferring and storing: the long and large section has large size, heavy weight and weak local rigidity, the problem of local stress in the transferring and storing process of the long and large section is calculated, a reinforcing structure is designed at the crossed part of a partition plate and a web plate of the box girder of the long and large section and is used as a supporting position for transferring, and the linear control of the transferring and storing stage is ensured to be within a deformation range;
(9) on-site large-section linear control: the on-site long and large section steel box girder is usually provided with a positioning bracket and a pier top beam adjusting device to ensure that the shape indexes such as plane position coordinates, elevation, axes and the like meet the acceptance requirements in the erection stage.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115030047A (en) * | 2022-06-30 | 2022-09-09 | 中冶(上海)钢结构科技有限公司 | Construction method of large-span flange connection S-shaped curve arch-arch box type trestle |
| CN115455771A (en) * | 2022-09-15 | 2022-12-09 | 华南理工大学 | Method for controlling deformation error caused by temperature effect in manufacturing large-section steel box girder |
| CN115030047B (en) * | 2022-06-30 | 2024-06-04 | 中冶(上海)钢结构科技有限公司 | Construction method of large-span flange connection S-shaped curve arching box trestle |
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