CN114059447A - Steel pipe concrete bridge tower and construction method thereof - Google Patents
Steel pipe concrete bridge tower and construction method thereof Download PDFInfo
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- CN114059447A CN114059447A CN202111414667.2A CN202111414667A CN114059447A CN 114059447 A CN114059447 A CN 114059447A CN 202111414667 A CN202111414667 A CN 202111414667A CN 114059447 A CN114059447 A CN 114059447A
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- 229910000831 Steel Inorganic materials 0.000 title claims description 259
- 239000010959 steel Substances 0.000 title claims description 259
- 239000004567 concrete Substances 0.000 title claims description 63
- 238000010276 construction Methods 0.000 title claims description 48
- 238000007596 consolidation process Methods 0.000 claims description 43
- 238000007789 sealing Methods 0.000 claims description 23
- 238000003466 welding Methods 0.000 claims description 22
- 238000010008 shearing Methods 0.000 claims description 11
- 239000000725 suspension Substances 0.000 description 10
- 230000008901 benefit Effects 0.000 description 9
- 238000005452 bending Methods 0.000 description 7
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 210000001503 joint Anatomy 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000009417 prefabrication Methods 0.000 description 4
- 238000005192 partition Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/02—Suspension bridges
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- 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
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/268—Composite concrete-metal
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Abstract
本发明涉及悬索桥技术领域，具体涉及一种钢管混凝土桥塔及其施工方法，其中桥塔结构包括若干用于约束混凝土的钢管一和沿桥塔轴向排布设置的多个固结单元，每个固结单元包括多个钢管二，钢管二沿桥塔周向横向连接相邻两个钢管一，桥塔结构能够通过在相邻两个固结单元之间的钢管一上进行切割而划分为多个拼接节段，拼接节段至少包含一个固结单元。本发明基于特定设计的钢管混凝土桥塔结构，仅沿钢管一进行切割将桥塔划分为多个拼接节段，以便于实现将桥塔结构装配化运输和高距离浇筑施工，避免了空中相贯线焊接，不仅降低了施工难度，而且焊缝质量更容易得到保证，提高了施工效率，施工方便、快捷，运输成本和施工成本低。
The invention relates to the technical field of suspension bridges, in particular to a concrete-filled steel tubular pylon and a construction method thereof. Each consolidation unit includes a plurality of steel pipes 2, and the steel pipes 2 are laterally connected to two adjacent steel pipes 1 along the circumference of the bridge tower. The structure of the bridge tower can be divided into two parts by cutting the steel pipe 1 between the two adjacent consolidation units. A plurality of spliced segments, the spliced segments comprise at least one consolidation unit. The invention is based on the specially designed concrete-filled steel tube pylon structure, and the pylon is divided into a plurality of splicing segments only by cutting along the first steel pipe, so as to realize the assembly transportation of the pylon structure and the high-distance pouring construction, and avoid the intersection in the air. Line welding not only reduces the difficulty of construction, but also makes it easier to ensure the quality of welds, improves construction efficiency, facilitates and quick construction, and reduces transportation and construction costs.
Description
Technical Field
The invention relates to the technical field of suspension bridges, in particular to a concrete-filled steel tube bridge tower and a construction method thereof.
Background
The main tower of the suspension bridge is a main bearing component of the suspension bridge for resisting vertical load, and is mainly stressed. The traditional suspension bridge main tower adopts a concrete bridge tower, a steel bridge tower and a mixed bridge tower structure; the concrete bridge tower is widely applied due to high bearing capacity, but the bearing capacity under the action of an earthquake is lower due to high self weight, meanwhile, the concrete needs more gravels, the construction cost is high, the construction period generally reaches more than 1 year, and the consumed time is long; the steel tower has smaller dead weight and is beneficial to earthquake resistance, but the steel consumption is large, the cost is higher, the mountainous environment does not have the transportation condition of large-scale steel members, and the steel box tower column is easy to generate vortex-induced vibration under the action of wind load; the hybrid bridge tower has the advantages of a concrete bridge tower and a steel tower, has high bearing capacity, can reduce the dead weight of the main tower to a certain extent, does not solve the problems fundamentally, and still has the inherent defects of the concrete bridge tower and the steel tower.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a concrete-filled steel tube bridge tower and a construction method thereof, which can be used for prefabricating and detachably transporting large bridge tower components, reducing the transportation difficulty in mountainous areas, shortening the construction period, improving the construction efficiency, fully exerting the compression resistance of a concrete-filled steel tube structure and the section geometric characteristics of a column of the bridge tower and ensuring the performance requirements of large-span or high-rise bridge tower construction.
In order to achieve the purpose, the invention adopts the technical scheme that:
a concrete-filled steel tube bridge tower comprises a plurality of spliced sections, wherein each spliced section comprises a plurality of steel tubes I and at least one consolidation unit positioned on the steel tubes I, concrete is filled in the steel tubes I, each consolidation unit comprises a plurality of steel tubes II, the steel tubes II are transversely connected with two adjacent steel tubes I along the circumferential direction of the bridge tower, and the two adjacent consolidation units are longitudinally arranged at intervals along the bridge tower; all the splicing sections are in butt joint connection through steel pipes.
The consolidation unit is used for connecting all the steel pipes I into a whole, so that the integral stability of the concrete-filled steel pipe bridge tower structure is ensured; the second steel pipe is used as a web member, and the unbalanced axial force of the two adjacent first steel pipes can be transmitted through the self bending resistance. The suspension bridge tower adopts a steel pipe concrete structure, the characteristics of good ductility, light dead weight and no need of concrete templates of the steel pipe concrete material are fully exerted, and the compression resistance bearing capacity and the construction efficiency of the bridge tower are obviously improved; on the basis, the distance between the consolidation units can be properly increased on the basis of safe and stable structure by reasonably arranging the consolidation units connected with the first main bearing steel pipe, so that the steel consumption is saved, the dead weight is reduced, and the shock resistance is improved; meanwhile, the bridge tower can be divided into the splicing sections at one position of the steel pipe through reasonably arranging the consolidation units, and connecting lines of the corresponding division nodes on all the steel pipes are not interfered by other members, so that the bridge tower is divided into a plurality of splicing sections, the divided splicing sections can be constructed by butt welding the steel pipes during construction, the aerial intersecting line welding is not needed, the welding line quality is easier to ensure, and the construction efficiency is high; and the bridge tower is divided into a plurality of splicing sections, so that the transportation is convenient, and the transportation difficulty of large components is reduced. In addition, the concrete filled steel tube bridge tower provided by the invention has the advantages that the consolidation units are longitudinally arranged at intervals along the bridge tower, so that the bridge tower has a structural form of a multi-section hollow section and a lattice column as a whole, the air permeability of the bridge tower is increased, the wind resistance is improved, and vortex-induced vibration is not easy to occur.
The concrete-filled steel tube bridge tower provided by the invention has the advantages that the long bridge tower is simplified, the assembly prefabrication, the transportation and the construction can be realized, the performance requirements of an oversized span suspension bridge or a high bridge tower are easily met, the construction difficulty is low, the adaptability to the construction environment is high, the bridge tower structure construction time is short, the compression resistance and the bearing performance are high, the wind resistance is good, and the vortex-induced vibration can be favorably avoided.
Preferably, the bridge tower further comprises a diaphragm, the diaphragm abutting all the second steel pipes in a single consolidation unit; or the bridge tower further comprises a third steel pipe, and the third steel pipe is connected with the two adjacent second steel pipes in a single consolidation unit. The transverse partition plate/the steel pipe III are arranged, so that the torsion resistance and other performances of the bridge tower structure are improved, and the structural stability is further enhanced.
Preferably, when the bridge tower comprises the diaphragm, the diaphragm is arranged at intervals of at least one consolidation unit along the longitudinal direction of the bridge tower; when the bridge tower comprises the third steel pipe, the third steel pipe is arranged along the bridge tower at intervals of at least one consolidation unit longitudinally, so that the steel consumption is saved on the premise of ensuring enough bending resistance, torsional strength and compressive bearing capacity of the bridge tower structure.
Preferably, each spliced segment comprises at least two consolidation units, a plurality of steel sealing plates are arranged between every two adjacent consolidation units along the circumferential direction of the bridge tower, the upper end and the lower end of each steel sealing plate are respectively connected with two corresponding steel pipes II, two sides of each steel sealing plate are respectively connected with two adjacent steel pipes I, and the two adjacent consolidation units and the steel sealing plates correspondingly connected with the two adjacent consolidation units form a shear unit; all the shear resisting units are arranged at intervals along the longitudinal direction of the bridge tower; accordingly, the joint of two adjacent splicing segments is located between two corresponding shear units, so that splicing of the bridge tower segments is facilitated.
The shearing resistant unit effectively combines the web member steel pipe II and the steel sealing plate, on one hand, unbalanced axial force between the adjacent steel pipes I is transmitted by utilizing the larger shearing rigidity of the steel sealing plate, and the steel sealing plate can effectively reduce the stress value on the web member steel pipe II, and on the other hand, the weak point of the steel sealing plate which is easy to deform out of plane is made up by utilizing the steel pipe II and the steel pipe I; the structural arrangement of the shear units also improves the bending and torsion resistance of the bridge tower. On the basis, on the premise of ensuring the structural strength and enough bearing capacity, the shearing resistant units can be properly lengthened, the steel consumption is reduced, the wind resistance is improved, the performance requirements of a large-span and high-rise bridge tower can be met, and the production cost is reduced.
Preferably, the stiffening plate is arranged on the inner side of the steel seal plate and used for improving the surface strength of the steel seal plate and making up the defect that the steel seal plate is easy to deform out of the surface.
Preferably, at least one splicing section further comprises a fourth steel pipe, and two ends of the fourth steel pipe are respectively connected with the first adjacent steel pipes; in the bridge tower, a steel pipe IV is arranged between two adjacent shear units; correspondingly, the joint of two adjacent splicing segments is positioned between the corresponding shear unit and the steel pipe IV.
When two adjacent shear units interval was too big, the accessible rationally set up steel pipe four between adjacent shear units, further provide transfer path for unbalanced shaft power on the steel pipe one, strengthen the mechanical properties of weak link, do benefit to and reduce the steel quantity, improve structural security.
When dividing the segmental, can only include single shear unit, both ends no steel pipe four with some concatenation segmental, some concatenation segmental only one end sets up the steel pipe four or both ends all are equipped with the steel pipe four and carry out the bridge tower segmental division, select suitable node concatenation position according to actual conditions.
Preferably, the second steel pipe/the fourth steel pipe are horizontally arranged, the steel consumption is less, a plurality of splicing sections of the bridge tower can be conveniently divided by straight sections, the construction efficiency is high, and the appearance is concise and attractive.
Preferably, the second steel pipe/the fourth steel pipe are hollow members, so that the weight of the bridge tower is reduced, and prefabrication and transportation are facilitated.
Preferably, the concrete filled steel tube bridge tower further comprises a tower cap and a foundation, wherein the top ends of all the first steel tubes are fixedly connected to the tower cap, and the bottom ends of all the first steel tubes are fixedly connected to the foundation. The tower cap and the foundation restrain radial deformation of the tower end and enhance the overall rigidity of the tower column, wherein the tower cap is used for providing installation space for the saddle.
The invention also provides a construction method of the concrete filled steel tube bridge tower, which comprises the following steps:
aligning the next splicing section to the previous splicing section, and performing aligned welding on the steel pipes at the corresponding ends of the two splicing sections;
pouring concrete into the first steel pipe of the next splicing section and vibrating;
and the butt joint and the pouring of all the splicing sections are sequentially finished from bottom to top by analogy.
According to the construction method provided by the invention, based on the specially designed steel tube concrete bridge tower structure, the bridge tower is divided into a plurality of splicing sections by only cutting along the first steel tube, so that the assembling transportation and the high-distance pouring construction of the bridge tower structure are realized, the aerial intersecting line welding is avoided, the construction difficulty is reduced, the welding seam quality is ensured more easily, the construction efficiency is improved, the construction is convenient and fast, and the transportation cost and the construction cost are low.
Preferably, after the last spliced section is filled with concrete and formed, a tower cap is welded on the top of the bridge tower.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the concrete-filled steel tube bridge tower provided by the invention has the advantages that the long bridge tower is simplified, the assembly prefabrication and construction can be realized, the performance requirements of an oversized span suspension bridge or a high bridge tower are easily met, the construction difficulty is low, the adaptability to the construction environment is high, the bridge tower structure is short in construction time, high in compression resistance and bearing performance and good in wind resistance, and the vortex-induced vibration can be favorably avoided.
2. The steel tube concrete lattice type bridge tower structure provided by the invention fully exerts the characteristics of good ductility, light dead weight, convenience in installation and no need of concrete templates of the steel tube concrete material, thereby greatly improving the bearing capacity and the construction efficiency of the tower column.
3. The shear resistant unit structure is used as a bridge tower web member structure, the geometric characteristics of the cross section are fully exerted, and the overall performance of the concrete filled steel tube lattice column is effectively improved. Compared with the structural form of the full-horizontal web members, the structural web member system has the advantages that the effective utilization rate is higher, the number of the arranged web members is less, and the steel can be saved by more than 15%; compared with a web member structure form adopting triangular or N-shaped arrangement, the structure has no aerial intersecting line welding, the welding seam quality is easier to ensure, and the construction efficiency is higher because only the butt welding of the bearing column steel pipe is needed; from pleasing to the eye, because web member spare quantity reduces, whole structure seems more succinct, and the combination of steel closing plate and each steel pipe has also strengthened the rhythm of the lattice column lines.
4. Compared with the prior suspension bridge tower with the highest value of about 200 meters and a reinforced concrete structure, the steel tube concrete lattice bridge tower provided by the invention has the maximum height of 300 meters, the span of a corresponding suspension bridge can be as long as about 2500 meters, and the weight can be saved by 1/3 under the same height.
5. The torsional rigidity of the steel tube concrete lattice type bridge tower provided by the invention is not different from that of a reinforced concrete bridge tower, the rigidity is about 90% of that of a concrete bridge tower with the same height, and the bearing capacity can be improved by more than 3.74 times.
6. According to the construction method provided by the invention, based on the specially designed steel tube concrete bridge tower structure, the bridge tower is divided into a plurality of splicing sections by only cutting along the first steel tube, so that the assembling transportation and the high-distance pouring construction of the bridge tower structure are realized, the aerial intersecting line welding is avoided, the construction difficulty is reduced, the welding seam quality is ensured more easily, the construction efficiency is improved, the construction is convenient and fast, and the transportation cost and the construction cost are low.
Drawings
Fig. 1 is a schematic structural view of a concrete filled steel tube bridge tower.
Fig. 2 is a schematic structural view of a concrete filled steel tube bridge tower according to example 2.
Fig. 3 is an enlarged schematic view of a portion a of fig. 2.
Fig. 4 is a schematic structural view of a concrete filled steel tube bridge tower according to example 3.
Fig. 5 is a front view of fig. 4.
Fig. 6 is a sectional view of a portion B-B in fig. 5.
Fig. 7 is a sectional view of the portion C-C in fig. 6.
Fig. 8 is a schematic structural view of a concrete filled steel tube bridge tower according to example 4.
Fig. 9 is a schematic structural view of a concrete filled steel tube bridge tower according to example 5.
Fig. 10 is an enlarged schematic view of a portion D in fig. 9.
Fig. 11 shows the change in stress values of the web members under certain conditions when the steel sealing plate is omitted in the concrete filled steel tube bridge tower of example 4.
Fig. 12 shows the change in stress values of the web members under certain conditions when the concrete-filled steel tube bridge tower of example 4 is provided with a steel sealing plate.
Icon: 1-steel pipe I; 2-steel pipe two; 3-steel pipe III; 4-steel pipe four; 5-diaphragm plate; 5A-manhole; 6-steel sealing plate; 7-tower cap; 8-a base; 9-a stiffening plate.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A concrete filled steel tube bridge tower is shown in figures 1-10 and comprises a plurality of splicing sections, wherein each splicing section comprises a plurality of steel tubes I1 and at least one consolidation unit positioned on the steel tubes I, concrete is filled in the steel tubes I1, the consolidation units are used for connecting all the steel tubes I1 into a whole, the integral stability of the concrete filled steel tube bridge tower structure is guaranteed, each consolidation unit comprises a plurality of steel tubes II 2, the steel tubes II 2 are transversely connected with two adjacent steel tubes I1 along the circumferential direction of the bridge tower, the steel tubes II 2 serve as web members, and unbalanced axial force of the two adjacent steel tubes I1 can be transmitted through self bending resistance; two adjacent consolidation units are arranged at intervals along the longitudinal direction of the bridge tower, and all the splicing sections are in butt joint connection through a first steel pipe 1.
In the embodiment, the suspension bridge tower adopts a steel pipe concrete structure, the characteristics of good ductility, light dead weight and no need of a concrete template of a steel pipe concrete material are fully exerted, and the compression resistance bearing capacity and the construction efficiency of the bridge tower are obviously improved; on the basis, the distance between the consolidation units can be properly increased on the basis of safe and stable structure by reasonably arranging the consolidation units connected with the first main bearing steel pipe, so that the steel consumption is saved, the dead weight is reduced, and the shock resistance is improved; meanwhile, the bridge tower can be divided into the splicing sections at one position of the steel pipe through reasonably arranging the consolidation units, and connecting lines of the corresponding division nodes on all the steel pipes are not interfered by other members, so that the bridge tower is divided into a plurality of splicing sections, the divided splicing sections can be constructed by butt welding the steel pipes during construction, welding of air intersecting welding seams is not needed, the quality of the welding seams is easier to ensure, and the construction efficiency is high; and the bridge tower is divided into a plurality of splicing sections, so that the transportation is convenient, and the transportation difficulty of large components is reduced. In addition, the concrete filled steel tube bridge tower provided by the invention has the advantages that the consolidation units are longitudinally arranged at intervals along the bridge tower, so that the bridge tower has a structural form of a multi-section hollow section and a lattice column as a whole, the air permeability of the bridge tower is increased, the wind resistance is improved, and vortex-induced vibration is not easy to occur.
Specifically, the second steel pipe 2 is preferably a hollow member and is horizontally disposed. Light in weight, the steel quantity is few, also makes things convenient for a plurality of concatenation segmentations of bridge tower to adopt straight section to divide, and the efficiency of construction is high, and the outward appearance is succinct, pleasing to the eye.
Example 2
Based on example 1, as a specific implementation, as shown in fig. 2 and 3, the bridge tower further comprises a diaphragm 5, and the diaphragm 5 abuts against all the second steel pipes 2 in a single consolidation unit. The transverse partition plate 5 is mainly used for improving the torsion resistance and other performances of the bridge tower structure, and the structural stability is further enhanced. In this embodiment, in all the consolidation units, the transverse partition plates 5 are preferably arranged at intervals of one consolidation unit along the longitudinal direction of the bridge tower, so that the steel consumption is saved and the structure is attractive on the premise of ensuring that the bridge tower structure has enough bending resistance, torsional strength and compressive bearing capacity.
Further, the center of the diaphragm plate 5 is provided with a manhole 5A, so that the maintainers can conveniently pass through the manhole.
Example 3
Based on example 1, as a specific implementation, as shown in fig. 4-7, the bridge tower further comprises a steel pipe three 3, and the steel pipe three 3 connects two adjacent steel pipes two 2 in a single consolidation unit. The third steel pipe 3 can be used for improving the torsion resistance and other performances of the bridge tower structure, and further enhancing the structural stability.
In the embodiment, in all the consolidation units, the steel pipes three 3 are arranged at intervals of one consolidation unit along the longitudinal direction of the bridge tower, so that the steel consumption is saved and the structure is attractive on the premise of ensuring that the bridge tower structure has enough bending resistance, torsional strength and compressive bearing capacity. Furthermore, the third steel pipe 3 is a hollow component, so that the weight is light.
Example 4
Based on examples 1-3, as a specific embodiment, fig. 8. The concrete filled steel tube bridge tower provided by the embodiment is further improved, and the difference is that: the single splicing segment comprises at least two consolidation units, a plurality of steel sealing plates 6 are arranged between every two adjacent consolidation units along the circumferential direction of the bridge tower, the upper end and the lower end of each steel sealing plate 6 are respectively connected with two corresponding steel pipes II 2, two sides of each steel sealing plate are respectively connected with two adjacent steel pipes I1, and the two adjacent consolidation units and the steel sealing plates 6 which are correspondingly connected form a shear unit; all the shear resisting units are arranged at intervals along the longitudinal direction of the bridge tower; accordingly, the joint of two adjacent splicing segments is located between two corresponding shear units, so that splicing of the bridge tower segments is facilitated.
The shearing resistant unit effectively combines the web member steel pipe II 2 and the steel seal plate 6, on one hand, the unbalanced axial force between the adjacent steel pipes I1 is transmitted by utilizing the larger shearing rigidity of the steel seal plate 6, and the steel seal plate 6 can effectively reduce the stress value on the web member steel pipe II 2, and on the other hand, the steel seal plate 6 makes up the defect that the steel seal plate 6 is easy to deform out of a plane by utilizing the steel pipe II 2 and the steel pipe I1; the structural arrangement of the shear units also improves the bending and torsion resistance of the bridge tower. On the basis of the foundation 8, on the premise of ensuring the structural strength and enough bearing capacity, the shearing resistant units can be properly lengthened, the steel consumption is reduced, the wind resistance is improved, the performance requirements of a large-span and high-rise bridge tower can be met, and the production cost is reduced.
The thickness of the steel seal plate 6 is generally slightly smaller than that of the adjacent web member steel tube 2, and is mainly limited by a welding process; the thickness of the steel sealing plate 6 also meets the requirement of the high-thickness ratio in the design specification of the highway steel structure bridge.
Further, if necessary, a plurality of stiffening plates 9 are welded on the inner side of the steel sealing plate 6 at intervals; the stiffening plate 9 is perpendicular to the steel seal plate 6 and can be arranged at a certain inclination angle relative to the stiffening plate 9. The stiffening plate 9 is used for improving the surface strength of the steel seal plate 6 and can also make up the defect that the steel seal plate 6 is easy to deform out of the surface.
Example 5
Based on embodiment 4, the concrete filled steel tube bridge tower provided by the present embodiment is further improved, as shown in fig. 9 and 10, except that: the at least one spliced section further comprises a steel pipe four 4, and two ends of the steel pipe four 4 are respectively connected with two adjacent steel pipes I1; in the bridge tower, a steel pipe four 4 is arranged between two adjacent shear units; accordingly, the junction of two adjacent splice segments is between the corresponding shear unit and the steel duct four 4.
Specifically, the four 4 steel pipes are horizontally arranged, the steel consumption is small, the plurality of splicing sections of the bridge tower can be conveniently divided by straight sections, the construction efficiency is high, and the appearance is concise and attractive; further, the steel pipe four 4 is a hollow component and is used for reducing the weight of the bridge tower and facilitating prefabrication and transportation.
In the embodiment, the fourth steel pipe 4 is located at a position 0.5-0.75 times of the distance between two adjacent shearing resisting units, and the distance between two adjacent shearing resisting units is 1.5 times of the distance between the first adjacent steel pipes 1.
When two adjacent shear units interval was too big, the accessible rationally set up steel pipe four 4 between adjacent shear units, further provide transfer path for unbalanced shaft power on steel pipe 1, strengthen the mechanical properties of weak link, do benefit to and reduce the steel quantity, improve structural security.
When dividing the segmental, can only include single shear unit, both ends do not have steel pipe four 4 with some concatenation segmentss, some concatenation segmentss only one end sets up steel pipe four 4 or both ends all are equipped with steel pipe four 4 and carry out the bridge tower segmental division, select suitable node concatenation position according to operating condition.
As shown in fig. 11 and fig. 12, the stress variation of the second steel pipe in the same environmental condition of the bridge tower without the steel sealing plate and the bridge tower with the steel sealing plate is simulated, and it can be seen that the closer the second steel pipe is to the first steel pipe, the larger the stress value is, that is, the more concentrated the stress is; under both compare, have the bridge tower of steel shrouding, compare the bridge tower that does not have the steel shrouding, the stress value of steel pipe two obviously reduces, consequently, the security that can improve the structure of setting up of steel shrouding.
In examples 1 to 5, the steel tube concrete bridge tower further includes a tower cap 7 and a foundation 8, which are not shown in the figures, and all the steel tubes 1 are fixed at the top end to the tower cap 7 and at the bottom end to the foundation 8. The tower cap 7 and the foundation 8 restrain radial deformation of the tower end and enhance the overall rigidity of the tower column, wherein the tower cap 7 is used for providing installation space for the saddle.
The arrangement of the second steel pipe 2, the third steel pipe 3 and the fourth steel pipe 4 is not limited to the horizontal arrangement and the hollow structure, and an appropriate inclined arrangement mode can be selected to enable the first steel pipe 1 to be conveniently cut when the bridge tower is divided into splicing sections, and the first steel pipe 1 only needs to be butted when the bridge tower is spliced, so that the butt joint of intersecting lines in the air is avoided; the second steel pipe 2, the third steel pipe 3 and the fourth steel pipe 4 can also be filled with filling materials, and the filling materials are adaptively adjusted according to construction conditions and structures of other parts of the bridge tower.
In addition, the whole size of above-mentioned steel core concrete bridge tower is unrestricted, because the cross sectional dimension of single bearing steel pipe receives the restriction of steel sheet wall thickness (steel pipe thickness has decided the maximum value of steel pipe diameter and the maximum value of steel pipe to the intraductal concrete constraint effect), when the atress needs and the size is not enough, constructor can increase the number of steel pipe 1 according to concrete operating mode and atress requirement, be not limited to a steel pipe quantity, also be not limited to conventional rectangular cross section design, also can select polygon cross sectional form such as triangle-shaped, pentagon according to the design requirement.
According to results of multiple groups of tests, when the wall thickness ratio of the web members (such as the second steel pipe and the fourth steel pipe) to the first bearing pipe in the bridge tower is 0.3-0.8, and the diameter ratio is 0.4-0.7, the arrangement is more reasonable, the quality of a welding seam is easier to guarantee, and the fatigue life is long. The distance between two adjacent web pipes is generally 1-1.5 times of the distance between two adjacent steel pipes, and the value mainly influences the local stability and the overall stability of the bridge tower and the stress of the web members.
Example 6
Based on embodiments 1 to 5, this embodiment provides a construction method of the foregoing concrete filled steel tube bridge tower, including the following steps:
determining the division length of the splicing segments according to the transportation condition and the field installation condition;
prefabricating each spliced segment of the bridge tower in a factory according to design requirements, wherein the method comprises the steps of preparing required components (such as a first steel pipe, a second steel pipe, steel sealing plates, stiffening plates and the like) and welding;
on the site of a construction site, a foundation is cast in situ on site, and the embedded section of the first section of the splicing section is constructed simultaneously with the foundation; aligning the next splicing section to the previous splicing section, performing butt welding on the steel pipe of the next splicing section and the steel pipe of the previous splicing section (the butt welding technology of the steel pipes is relatively mature, and is not described herein any more, such as a positioning tool for butt welding of the steel pipes provided by the Chinese patent application No. CN201820999766.9, a hoop type round steel pipe butt adjustment clamp provided by the CN201420603508.6, and the like), pouring concrete into the steel pipe of the next splicing section from top to bottom and vibrating, and continuing the construction of the next splicing section when the strength of the concrete in the steel pipe of the splicing section reaches 85% of the designed strength;
and so on and finish all butt joints and concrete placement of splicing the segmental sequentially from bottom to top;
the tail end of the last spliced section is connected with the steel shell of the bridge tower cap into a whole when being prefabricated in a factory, the steel pipe is only butted when being installed on site, and finally concrete is cast to the steel shell of the tower cap in a highly-cast mode to complete the construction of the last spliced section.
Different hoisting equipment can be selected according to the cross-sectional dimension of the bridge tower in the assembly operation, when the cross-sectional dimension is small, a tower crane can be arranged beside the bridge tower, and when the cross-sectional dimension is large, self-climbing type erection equipment can be arranged in other middle hollow parts to finish aerial work.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
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