CN115075562B - Method for releasing additional stress of large-span truss structure partition phased construction - Google Patents
Method for releasing additional stress of large-span truss structure partition phased construction Download PDFInfo
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- CN115075562B CN115075562B CN202210746028.4A CN202210746028A CN115075562B CN 115075562 B CN115075562 B CN 115075562B CN 202210746028 A CN202210746028 A CN 202210746028A CN 115075562 B CN115075562 B CN 115075562B
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- 238000010276 construction Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005192 partition Methods 0.000 title claims abstract description 16
- 230000000694 effects Effects 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 238000003466 welding Methods 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000004088 simulation Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 2
- 238000000638 solvent extraction Methods 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 230000001360 synchronised effect Effects 0.000 abstract description 2
- 230000003750 conditioning effect Effects 0.000 description 3
- 210000001503 joint Anatomy 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000013316 zoning Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
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- Rod-Shaped Construction Members (AREA)
Abstract
The invention discloses a method for releasing additional stress of a large-span truss structure in a partitioning and grading manner, which aims at the problems that the configuration is not synchronous during the partitioning and grading construction of the large-span truss structure, the secondary trusses among the partitions are connected too early to cause configuration errors, additional stress and the like, so that structural hidden danger is caused, the secondary trusses among the partitions are designed to be hinged first and then are just connected, and when the configuration of the partitioning structure is inconsistent, the roofing water closing of different partitions is realized by hinging first; when the sectional structure is constructed in stages, the sectional structure is rigidly connected after the application of the additional constant load is finished, and the effects of eliminating the potential difference and releasing the additional stress are finally realized. The invention can ensure continuous construction, uninterrupted working surface and minimized additional stress, solves the problems of inconsistent construction deformation and additional stress in different stages of partition, and has good popularization and application prospect.
Description
Technical Field
The invention relates to the technical field of building steel structures, in particular to a method for releasing additional stress of a large-span truss structure in a zoning and staged construction mode.
Background
At present, a plurality of large-scale works are constructed by adopting regional and staged (steel structure stage, curtain wall stage, roof stage and the like) interpenetration due to the limitations of construction environment, construction progress plan, construction stage arrangement and the like. When the large-span truss structure is constructed in a partitioning and staged mode, the structure is not completely formed, the configuration changes are asynchronous, the problem that secondary trusses between the partitions are connected in a premature mode can cause configuration errors, additional stress and the like, the problem is far from the problem that the primary forming state is designed, and the structure is safe and has great hidden trouble.
Under the conventional condition, a post-assembly method is adopted for the steel structure between the areas, after the main body structure is subjected to the sectional construction, the secondary trusses between the areas are connected, and temporary construction joints are arranged. The traditional construction method can cause discontinuous structure and poor overall stability; the construction working surface is interrupted, the stages are not closely inserted, and the construction period is prolonged; the sealing performance of the joints of the roof water closing and curtain walls is poor, and phenomena such as cracking and water seepage are easy to occur.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for releasing the additional stress of the partitioning and staged construction of a large-span truss structure, which can effectively reduce the additional internal force of the structure and ensure the safety of the use state of the structure.
In order to achieve the above purpose, the present invention provides the following technical solutions: a method for releasing additional stress of large-span truss structure partition staged construction comprises the following steps:
step one: according to the construction schedule, carrying out primary main body steel structure construction firstly, and then carrying out secondary main body steel structure construction, and carrying out alternate running water construction on enclosure structures such as curtain walls, roofs and the like;
step two: adopting a finite element construction whole process simulation analysis technology to calculate the configuration change and additional stress condition of the secondary truss between the primary truss and the secondary truss in each construction stage;
Step three: two force rod adjusting tools are connected between the secondary truss and the main truss, two ends of each two force rod adjusting tool are provided with adjusting nodes which are hinged first and then rigid, the adjusting nodes adapt to the structural position differences of the first area and the second area through the hinged nodes, and building enclosure structures such as roofs among partitions can be constructed synchronously at the moment;
step four: the sectional structure is constructed in stages, and after the application of the additional constant load is completed, the two-force rod adjusting tool is converted into rigid node connection.
Further, when the deformation of the two main trusses is inconsistent, the secondary truss is connected with the main truss by adopting a two-force rod adjusting tool, and the effect of releasing additional stress is realized by hinging first and then setting up through the change of the connection mode of the two-force rod two-end adjusting nodes.
Further, two power pole regulation frock includes two power poles and sets up the regulation node at two power pole both ends, the regulation node is including fixing two picture peg at the chord member of two power poles and secondary truss respectively, seting up the slotted hole on the picture peg, reach relative rotation and slip effect through bolted connection between two picture peg, eliminate the structure configuration, two power pole earlier stages form two end hinge structures.
Furthermore, slots are formed in the ends of the two force rods and the chord members of the secondary truss, and the inserting plates are connected in the slots through welding seams.
Further, the chord member tip of two power poles and secondary truss is provided with the locating plate that is located the picture peg both sides, and the locating plate is located picture peg both sides and perpendicular and picture peg surface setting, and during the butt joint, the picture peg tip is spacing through the limiting plate, can make two picture peg quick location installations.
Further, when the secondary truss is constructed between the subareas, the initial installation state inclination angle of the two force bars is determined according to construction configuration results of the first subarea and the second subarea.
Further, according to the relative shape change of the two-region structure, the relative sliding and rotation of the two force rods are simulated, and the optimal solutions of the installation inclination angle, the direction of the slotted hole and the size of the opening of the two force rod adjusting tool are accurately obtained, so that the free deformation of different regions is realized, and no additional stress and bending moment are generated.
And further, after the additional constant load subareas are applied in stages, the displacement of the main trusses in the two areas is coordinated, the two force rods are restored to the design position from the initial inclined state, and the two end plugboards of the two force rods and the chord plugboards of the secondary trusses are fixed in a girth welding manner on three sides to form an integral rigid structure system.
Aiming at the problems that potential form is not synchronous when a large-span truss structure is constructed in a partitioning and phasing manner, potential form errors, additional stress and the like are caused by early connection of secondary trusses among the partitions, structural hidden dangers are caused, the secondary trusses among the partitions are designed to be hinged first and then are just connected, and when the potential form of the partition structure is inconsistent, the roof water closing of different partitions is realized by hinging first; when the sectional structure is constructed in stages, the sectional structure is rigidly connected after the application of the additional constant load is finished, and the effects of eliminating the potential difference and releasing the additional stress are finally realized. The invention can ensure continuous construction, uninterrupted working surface and minimized additional stress, solves the problems of inconsistent construction deformation and additional stress in different stages of partition, and has good popularization and application prospect. The method has the following advantages:
(1) The adjusting tool adopts the two-force rod, the plugboard, the oblong hole and the high-strength bolt, and has simple nodes and convenient installation;
(2) The adjusting tool can slide in a construction state and can be molded in a design state, so that a joint connection of first hinging and then rigid is formed;
(3) The construction method reduces the defects of the construction process of the structure, effectively reduces the additional internal force of the structure, and ensures the safety of the use state of the structure.
Drawings
FIG. 1 is a schematic view of the overall structure of an embodiment of the present invention;
FIG. 2 is a structural molding stage elevation view of an embodiment of the present invention;
FIG. 3 is a sectional elevation view of a structural floor assembly according to an embodiment of the present invention;
FIG. 4 is an elevation view of an overhead shape-modifying stage of the structure of an embodiment of the present invention;
FIG. 5 is a schematic diagram of an embodiment of a conditioning node structure according to the present invention;
FIG. 6 is an enlarged view of a portion of a conditioning node of an overhead shape-tuning stage of a structure in accordance with an embodiment of the present invention;
FIG. 7 is an enlarged view of a portion of a conditioning node at a construction stage in accordance with an embodiment of the present invention.
Labeling and describing: 1. a primary truss; 2. a second-region main truss; 3. a secondary truss; 4. a second force lever; 5. adjusting the node; 6. a slot; 7. a positioning plate; 8. temporary tooling; 9. inserting plate; 10. a slotted hole; 11. a bolt; 12. and (5) performing three-sided girth welding.
Detailed Description
Embodiments of a method of releasing additional stresses in a zoned phased construction of a large span truss structure in accordance with the present invention are further described with reference to fig. 1-7.
The invention relates to a station house project, which adopts a reinforced concrete frame, a concrete filled steel tube supporting column and a roof steel truss structure form. According to the construction plan, the construction of the steel roof is divided into a first area, a second area and a third area, and the construction is alternated among 3 areas of steel structure stages, curtain wall stages and roof stages. The first-area and second-area steel roofs are influenced by the stage dismantling progress of the existing structure, and the construction interval is as long as 6 months, so that when the second-area steel structure is constructed, the first-area structure is basically constructed, and the displacement of the first-area structure is larger than that of the second-area structure.
As shown in fig. 1 and 2, the embodiment of the present invention includes a primary truss 1, a secondary truss 2, a secondary truss 3, a secondary bar 4, an adjusting node 5, and the like. The primary region main truss 1 is connected with the secondary region main truss 2 through the secondary truss 3; the two-force rod 4 is arranged at the left end of the chord member of the secondary truss 3, and the two-force rod 4 rotates and slides relatively through the adjusting nodes 5 at the two ends, so that the potential difference between the primary truss 1 in the first area and the primary truss 2 in the second area is released, and the effect of releasing stress is achieved.
A method for releasing additional stress of large-span truss structure partition staged construction comprises the following steps:
Step one: determining a secondary truss 3 between the primary truss 1 and the secondary truss 2 as an adjusting position according to a construction plan;
Step two: calculating the displacement of the primary truss 1 in the first area and the secondary truss 2 in the second area by adopting a finite element construction whole process simulation analysis technology, and the configuration and additional stress conditions of the secondary truss 3 in the construction process between the areas, so that the configuration error of the secondary truss 3 and the excessive additional stress can be obtained;
Step three: the secondary truss 3 is subjected to two-force-rod adjusting tool design, and as shown in fig. 2, the secondary truss comprises a primary truss 1, a secondary truss 2, a secondary truss 3, two force rods 4, adjusting nodes 5 and the like. As shown in fig. 5, the insert plates 9 are connected with the slots 6 of the chord members/the secondary tension rods 4 of the secondary truss 3 by penetration welding, and the two insert plates 9 are connected by bolts 11 after being positioned quickly through the positioning plates 7 on the two sides of the end parts. Based on the adjusted structure, carrying out overall process simulation analysis, checking whether the main structure, the adjusting tool and the like meet the requirements;
Step four: the ground integrally assembled secondary truss 3 is shown in fig. 3, and the two-force rod 4 is fixed at the left end of the secondary truss 3 through the adjusting node 5 and the temporary tool 8 and is inclined towards the fixed angle of the primary truss 1 in a region. Installing the overhanging end of the secondary truss 3 according to the deformation result of the step three;
Step five: the whole hoisting secondary truss 3 is connected with brackets preset by the primary truss 1 by high-strength bolts 11 after being in place and is connected with the secondary primary truss 2 by intersecting welding seams as shown in fig. 4; removing the temporary tool 8, and forming a two-end hinge structure by the two force rods;
Step six: the two-region main truss 2 enters the roof and curtain wall construction stage, the adjusting node of the structural air shape adjusting stage is shown in fig. 6, and the two ends of the two-force rod 4 relatively rotate and slide in the oblong hole 10 through the high-strength bolt 11, so that Z-direction displacement of the two regions generated in the construction stage is released. And after the first area structure and the second area structure are deformed symmetrically, the two force rods 4 are restored to the design position, and the structure position is adjusted.
Step seven: and fixing the upper plugboard of the two-force rod 4 and the plugboard of the secondary truss 3 chord member by adopting three-surface girth welding 12 fillet welds, as shown in fig. 7, so as to form an integral stress structure system.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (6)
1. The method for releasing the additional stress of the large-span truss structure partition staged construction is characterized by comprising the following steps of:
step one: according to the construction schedule, carrying out primary main body steel structure construction firstly, and then carrying out secondary main body steel structure construction, and carrying out alternate flow construction on curtain walls and roof enclosing structures;
step two: adopting a finite element construction whole process simulation analysis technology to calculate the configuration change and additional stress condition of the secondary truss between the primary truss and the secondary truss in each construction stage;
Step three: two force rod adjusting tools are connected between the secondary truss and the main truss, two ends of each two force rod adjusting tool are provided with adjusting nodes which are hinged first and then rigid, the adjusting nodes adapt to the structural position differences of the first area and the second area through the hinged nodes, and the roof enclosing structures between the subareas can be synchronously constructed at the moment;
step four: the sectional structure is constructed in stages, and after the application of the additional constant load is completed, the two-force rod adjusting tool is converted into rigid node connection;
When the deformation of the two main trusses is inconsistent, the secondary truss is connected with the main truss by adopting a two-force rod adjusting tool, and the effect of releasing additional stress is realized by hinging first and then setting up through the change of the connection mode of adjusting nodes at the two ends of the two force rods;
The two-force rod adjusting tool comprises two force rods and adjusting nodes arranged at two ends of the two force rods, the adjusting nodes comprise two plugboards respectively fixed on chords of the two force rods and the secondary truss, oblong holes are formed in the plugboards, the two plugboards are connected through bolts to achieve relative rotation and sliding effects, structural position shapes are eliminated, and two-end hinge structures are formed at the front stage of the two force rods.
2. The method of releasing additional stress in a zoned phased construction of a large span truss structure of claim 1, wherein: slots are formed in the ends of the chord members of the secondary truss and the secondary truss, and the inserting plates are connected in the slots through welding seams.
3. The method of releasing additional stresses in a zoned phased construction of a large span truss structure of claim 2, wherein: the end parts of the chord members of the secondary truss and the secondary truss are provided with positioning plates positioned at two sides of the plugboard.
4. The method of releasing additional stress in a zoned phased construction of a large span truss structure of claim 1, wherein: and when the secondary truss is constructed between the subareas, determining the initial installation state inclination angle of the two force rods according to construction configuration results of the first subarea and the second subarea.
5. The method of releasing additional stress in a zoned phased construction of a large span truss structure of claim 1, wherein: according to the relative shape change of the two-region structure, the relative sliding and rotation of the two force rods are simulated, and the optimal solutions of the installation inclination angle, the direction of the slotted hole and the size of the opening of the two force rod adjusting tool are accurately obtained, so that the free deformation of different regions is realized, and no additional stress and bending moment are generated.
6. The method of releasing additional stress in a zoned phased construction of a large span truss structure of claim 1, wherein: after the additional constant load subareas are applied in stages, the displacement of the main trusses in the two areas is coordinated, the two force rods are restored to the design position from the initial inclined state, and the two end plugboards of the two force rods are fixed with the chord plugboards of the secondary trusses in a girth welding manner on three sides to form an integral rigid connection structure system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210746028.4A CN115075562B (en) | 2022-06-29 | 2022-06-29 | Method for releasing additional stress of large-span truss structure partition phased construction |
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| CN202210746028.4A CN115075562B (en) | 2022-06-29 | 2022-06-29 | Method for releasing additional stress of large-span truss structure partition phased construction |
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| CN115075562B true CN115075562B (en) | 2024-06-11 |
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