CN110777938B - Suspension structure for additionally arranging prestressed steel stay cable in steel truss - Google Patents
Suspension structure for additionally arranging prestressed steel stay cable in steel truss Download PDFInfo
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- CN110777938B CN110777938B CN201911148308.XA CN201911148308A CN110777938B CN 110777938 B CN110777938 B CN 110777938B CN 201911148308 A CN201911148308 A CN 201911148308A CN 110777938 B CN110777938 B CN 110777938B
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- steel
- prestressed
- steel truss
- truss
- suspension structure
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/34—Extraordinary structures, e.g. with suspended or cantilever parts supported by masts or tower-like structures enclosing elevators or stairs; Features relating to the elastic stability
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
Abstract
The invention relates to a suspension structure additionally provided with a prestressed steel cable in a steel truss, which comprises the steel truss, a steel frame beam, a steel column and the prestressed steel cable, wherein the steel truss comprises an upper chord, an inclined rod, a vertical rod and a lower chord, the vertical rod penetrates through the upper chord and the lower chord and connects the upper chord with the lower chord together, the lower end of the vertical rod is vertically aligned and communicated with the steel column in a lower hanging floor, the inclined rod is obliquely connected between the upper chord and the lower chord, the vertical rod and the steel column at the midspan position of the steel truss are internally communicated with the prestressed steel cable, the upper end and the lower end of the prestressed steel cable are respectively provided with a tensioning end and an anchoring end, the tensioning end is fixed at the top of the upper chord in the steel truss, and the anchoring section is fixed at the bottom of the steel frame beam at the bottommost layer in the lower hanging floor. If a certain rod piece in the steel truss is subjected to load bearing failure caused by accidents, internal force redistribution can be generated on all the rod pieces in the steel truss, and at the moment, the prestressed steel inhaul cable can instantly bear the pulling force to ensure that the whole structure can still work normally.
Description
Technical Field
The invention relates to a suspension structure with a prestressed steel cable additionally arranged in a steel truss, and belongs to the innovative technology in the field of suspension structures.
Background
Based on the requirement of diversified building functions, in public buildings such as businesses and exhibitions with dense personnel, a large-span high-through hollow area is arranged inside a tower. Based on indoor traffic streamline and attitude demand, building function needs will be in the cavity region and be close to upper portion several floor and set up a plurality of air vestibule under the prerequisite of bottom floor to the big space demand to form abundant changeable cubical space. In general, an air gallery supports upper floors by installing several steel trusses at a starting floor. However, the initial floor of the air corridor often has the function requirement of large space of the building, and the arrangement of the diagonal rods in the steel truss can influence the large space. The steel truss is arranged on the top floor, and a plurality of floors are hung downwards to form a suspension structure, so that the large space requirement of the building function of the bottom floor is realized, and a reasonable balance point is found for the coordination and unification of the complex and variable building function and the structural system. Because the pulled rod piece of the suspension structure has the problems of low redundancy, high sensitivity to external force resistance and the like, once the rod piece in the steel truss or the steel column of the lower suspension floor loses bearing capacity due to an accident, the potential safety hazard that the part or even the whole of the air corridor collapses continuously can occur. How to improve the stress performance of the suspension structure system, practically achieve safety and reliability, exert the advantages that the suspension structure system can be fully adapted to flexible and changeable building functions, and become the technical bottleneck that the suspension structure of the type can be popularized.
Disclosure of Invention
The invention aims to provide a suspension structure with an additional prestress steel cable in a steel truss based on the current research situation, the suspension structure is additionally provided with the prestress steel cable based on the conventional suspension structure, the structure is simple, the implementation is easy, the pertinence is strong, the proportion of increased engineering cost is small, the mechanical property of high tensile strength of the prestress steel cable is fully exerted, a second stress defense line is provided for the suspension structure, the safety degree of a structure system is greatly improved, and in the aspect of construction and installation, the construction process sequence is strong, the installation is convenient, and the suspension structure has the advantages of popularization in the same type project.
The technical scheme of the invention is as follows: the invention relates to a suspension structure for additionally arranging a prestressed steel cable in a steel truss, which comprises the steel truss, a steel frame beam, a steel column and the prestressed steel cable, wherein the steel truss comprises an upper chord, an inclined rod, a vertical rod and a lower chord, the vertical rod penetrates through the upper chord and the lower chord and connects the upper chord with the lower chord together, the lower end of the vertical rod is vertically aligned and communicated with the steel column in a lower hanging floor, the inclined rod is obliquely connected between the upper chord and the lower chord, the vertical rod and the steel column at the midspan position of the steel truss are internally communicated with the prestressed steel cable, the upper end and the lower end of the prestressed steel cable are respectively provided with a tensioning end and an anchoring end, the tensioning end is fixed at the top of the upper chord in the steel truss, and the anchoring end is fixed at the bottom of the steel frame beam at the bottommost layer in the lower hanging floor.
The invention adopts a structure comprising steel trusses, steel frame beams, steel columns and prestressed steel cables, namely, a plurality of steel trusses are arranged on the top floor of the hollow area of a tower building to be communicated, a plurality of floors are hung downwards, the functional requirements of the air corridor building are realized in a hanging structure mode, and vertical rods in the steel trusses are vertically aligned and communicated with the steel columns in the floors hung downwards. After the integral structure is installed, the vertical rods and the steel columns at the midspan positions of the steel truss are internally provided with the prestressed steel cables in a high-pass mode, after all steel components are installed in place, prestress is applied to the tensioning ends to provide a second stress defense line for the suspension structure, if a certain rod piece in the steel truss is subjected to accidents or bearing failure is caused by construction quality defects and the like, internal force redistribution of all rod pieces in the steel truss can be caused, at the moment, the prestressed steel cables can instantly bear the tension to ensure that the integral structure can still normally work, and the structure system accords with the design concept of continuous collapse prevention and can be used as one of important means for enhancing the safety degree of the suspension structure. The invention has the following advantages:
1) on the premise of meeting the using function of the building, the structural system has the technical characteristic of continuous collapse prevention.
2) On the premise of meeting the functional requirements of building plane arrangement, the number and the positions of the prestressed steel cables are reasonably determined, and the unification of building functions and a structural system is realized.
3) Once part of components in the steel truss are damaged due to external force and lose bearing capacity, the suspension structure can continuously maintain a stable stress system due to the fact that the prestressed steel cables instantaneously bear pulling force, great convenience can be provided for follow-up maintenance and reinforcement, and construction measure cost is saved.
The invention is suitable for high-rise buildings which are provided with hollow areas with through heights inside the buildings, have the high floor heights above the hollow areas and are additionally provided with air galleries, and has wide application range and development space.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a detailed view of the anchoring end of the prestressed steel cable of FIG. 1 at the upper chord of the steel truss;
FIG. 3 is a detailed view of the tension end of the prestressed steel cable located at the lower chord of the steel truss in FIG. 1;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 1, illustrating a cross-sectional view of a steel column with a prestressed steel cable disposed therein;
FIG. 5 is a cross-sectional view taken along line B-B in FIGS. 2 and 3, showing a cross-sectional view of the anchoring end and the fixing end of the prestressed steel cable;
fig. 6 is a plan view of a partial structure of a floor where a steel truss according to embodiment 1 of the present invention is installed;
fig. 7 is a cross-sectional view taken along line C-C in fig. 6, which is a schematic cross-sectional view of the embodiment 1 of the present invention applied to an actual process.
Detailed Description
The following detailed description of embodiments of the invention is provided in connection with the accompanying drawings.
As shown in figure 1, the invention relates to a suspension structure additionally provided with prestressed steel cables in a steel truss, which comprises a steel truss 1, a steel frame beam 2, a steel column 3 and prestressed steel cables 4, the steel truss 1 comprises an upper chord 5, an oblique rod 6, a vertical rod 7 and a lower chord 8, the vertical rod 7 penetrates through the upper chord 5 and the lower chord 8, the upper chord 5 and the lower chord 8 are connected together, the lower end of the vertical rod 7 is vertically aligned and communicated with the steel column 3 in the lower hanging floor, the diagonal rod 6 is obliquely connected between the upper chord 5 and the lower chord 8, the vertical rod 7 and the steel column 3 at the midspan position of the steel truss 1 penetrate through the prestressed steel cable 4 through the inner height, the upper end and the lower end of the prestressed steel cable 4 are respectively provided with a tensioning end 11 and an anchoring end 12, the tensioning end 11 is fixed to the top of the upper chord 5 in the steel truss 1, and the anchoring end 12 is fixed to the bottom of the steel frame beam 2 at the bottommost layer in the lower hanging floor.
The method is characterized in that a plurality of steel trusses 1 are arranged on the top floor of a hollow area of a tower building and communicated, a plurality of floors are hung downwards, the requirement for erecting an overhead corridor is achieved in a suspension structure mode, vertical rods 7 in the steel trusses 1 are vertically aligned and communicated with steel columns 3 in the floors hung downwards, after the whole structure is installed, the vertical rods 7 and the steel columns 3 in the midspan positions of the steel trusses 1 penetrate through prestressed steel cables 4 in a through mode, after all steel members are installed in place, prestress is applied to tension ends 11, a second stress defense line is provided for the suspension structure, if a certain member in the steel trusses 1 is subjected to accidental bearing failure, internal force redistribution of all members in the steel trusses 1 can be caused, at the moment, the prestressed steel cables 4 can instantly bear tension, and the whole structure can still work normally.
The vertical rod 7 is one of the components of the steel truss 1 and is positioned in the height range of the top floor, the steel column 3 is positioned in the height range of the lower hanging floor, and the vertical rod and the steel column are vertically aligned and communicated.
The prestressed steel cable 4 penetrates through the inner spaces of the vertical rod 7 and the steel column 3 in a high-pass mode, and the upper end and the lower end of the prestressed steel cable are respectively provided with a tensioning end 11 and an anchoring end 12 for fixation.
When the vertical rod 7 or the steel column 3 where the prestressed steel cable 4 is located is subjected to external force (such as impact, fire and the like) or quits the working state due to the problems of construction quality defects and the like, the prestressed steel cable 4 can instantly bear tension, which is equivalent to the effect of replacing the vertical rod 7 or the steel column 3, and can continuously maintain a stress system with a stable suspension structure.
When the inclined rod 6 and the vertical rod 7 which are arranged between the adjacent sections of the prestressed steel cable 4 are subjected to external force or quit the working state due to the problems of construction quality defects and the like, the steel truss 1 can generate internal force redistribution to cause the prestressed steel cable 4 to bear the tensile force, and the prestressed steel cable 4 can play a supporting role for the inclined rod 6 or the vertical rod 7 which are arranged between the adjacent sections in the steel truss 1 and quit the working state, so that the suspension structure can still be ensured to keep a stable stress system, and convenience is provided for later maintenance.
In this embodiment, the vertical rod 7 and the steel column 3 are steel pipes having a rectangular or circular cross-sectional shape.
In this embodiment, the corrugated tube 9 is installed on the outer side of the prestressed steel cable 4. The corrugated pipe 9 is used as a protective layer device of the prestressed steel cable 4, the prestressed steel cable 4 penetrates through the corrugated pipe 9 in a processing plant in advance to form an assembled finished member, and the assembled finished member penetrates through the vertical rod 7 and the steel column 3 in place after being transported on site.
In this embodiment, steel truss 1 sets up in the top floor, and the plane is arranged and is located the main axis direction, occupies 1 ~ 2 floors along the direction of height. And comprehensively determining the specific apparent span, load and support conditions.
In this embodiment, the prestressed steel cables 4 are preferably arranged in the vertical rods 7 at the midspan positions of the steel trusses 1 and are arranged in a penetrating manner in the floor along the height direction of the whole overhead corridor. Whether the vertical rods 7 at other positions are provided with the prestressed steel cables 4 or not is determined according to specific conditions.
In this embodiment, each of the tensioning end 11 and the anchoring end 12 includes an anchor plate 13 and a nut 14, where the anchor plate 13 is welded above the upper chord 5 and below the steel frame beam 2 at the bottommost layer of the lower hanging floor and located at a position where the vertical rod 7 and the steel column 3 intersect, a through hole through which the prestressed steel cable 4 and the corrugated pipe 9 pass is formed in the anchor plate 13, the nut 14 is sleeved on an outer circumferential ring of the anchor plate 13, and after the prestressed steel cable 4 and the corrugated pipe 9 are installed in place, the nut 14 is screwed on a thread pre-processed by the anchor plate 13 in place. The nut 14 is a steel nut.
In this embodiment, the tensioning end 11 and the anchoring end 12 further include a stiffening rib 16, and the stiffening rib 16 located at the tensioning end 11 is fixed on the inner wall of the vertical rod 7 and located within the height range of the upper chord 5 of the steel truss; the stiffening ribs 16 positioned at the anchoring end 12 are fixed on the inner wall of the steel column 3 and positioned within the height range of the steel frame beam 2 at the bottommost layer of the lower hanging floor.
In this embodiment, the stiffening ribs 16 are disposed along the full height or partial height of the upper chord 5 or the steel-frame girder 2 in the steel truss 1. As the case may be.
In this embodiment, the tensioning end 11 and the anchoring end 12 further include a welding steel protective cover 15, and the welding steel protective cover 15 is sleeved on the outer surface of the nut 14.
In this embodiment, in the areas of the tensioning end 11 and the anchoring end 12, after the belt is tensioned in place, the outer surfaces of the prestressed steel cable 4, the anchor plate 13 and the nut 14 are uniformly coated with the anti-corrosion grease 10 until the belt is completely wrapped and covered. The welding steel protective cover 15 is formed by welding steel plates, the shape of the welding steel protective cover is cylindrical, and the welding steel protective cover 15 is welded on the outer sides of the tensioning end 11 and the anchoring end 12 and is used for wrapping the tensioning end 11 and the anchoring end 12 to play a role of a protective layer.
Fig. 2 is a detailed view of the prestressed steel cable at the anchoring end in embodiment 1 of the present invention, that is, a detailed view of a structural node of the prestressed steel cable 4 at the position of the upper chord 5 in the steel truss 1 in fig. 1, where the prestressed steel cable 4 passes through the corrugated pipe 9 and is centrally disposed in a hollow area inside the vertical rod 7, in order to ensure that the corrugated pipe 9 is vertically disposed through, the upper chord 5 and the diagonal rod 6 intersecting the corrugated pipe 9 are both disconnected at the converging position, and sufficient space is reserved to ensure that the corrugated pipe 9 can pass through, and are located in the height direction of the upper chord 5, 1 set of stiffening ribs 16 are respectively disposed on the inner wall of the vertical rod 7 along the orthogonal direction, so as to provide a reliable support for the tensioning end 11.
Fig. 3 is a detailed view of the prestressed steel cable at the tensioning end in embodiment 1 of the present invention, that is, a detailed view of a structural joint of the prestressed steel cable 4 at the steel frame position at the bottommost layer of the suspended floor in fig. 1, fig. 2 is a region of the tensioning end 11, and fig. 3 is a region of the anchoring end 12, which are substantially identical in terms of the structural measures. The floor steel frame beam 2 is disconnected at the position where the corrugated pipe 9 penetrates, and the corrugated pipe 9 is ensured to be vertically communicated.
Fig. 4 is a schematic cross-sectional view of the prestressed steel cable in embodiment 1 of the present invention, the section of the prestressed steel cable 4 is rectangular or circular, and the corrugated tube 9 and the prestressed steel cable 4 are centrally disposed inside the steel column 3, are not in contact with the side walls, and are completely independent of each other.
Fig. 5 is a cross-sectional view of the prestressed steel cable at the anchoring end (or fixed end) in embodiment 1 of the present invention, which is substantially the same as fig. 4, except that 2 sets of stiffeners 16 are orthogonally and symmetrically welded to the inner wall of the vertical rod 7 or steel column 3 to support the tensioning end 11 or anchoring end 12.
Fig. 6 is a plan view of a local structure of a floor where a steel truss is located in the embodiment 1 of the present invention applied to an actual project, and the present invention is applied to an actual project, and seismic fortification intensity is 7 degrees, and a first group of seismic groups and a field class ii are designed. The engineering comprises 2 underground layers, 12 above ground layers and an above ground structure main body with the total height of 55.2m, wherein the structure system is a reinforced concrete frame-shear wall structure, and a suspension structure (a steel structure system) is adopted in a partial area. The overall planar arrangement of the tower is trapezoidal, the planar size is 220 multiplied by 62-100.5 m, large-scale hollow areas are arranged on 1-7 floors based on the requirements of the building functions of each floor, the building functions are large exhibition places, the planar size of the hollow areas is 160.8 multiplied by 22-47 m, and the planar arrangement of the structures of each floor is groove-shaped. 3 groups of air galleries are arranged on 8-12 floors, the hollow areas are connected into a whole on the middle upper floors, the width of each group of air galleries is 28-32 m, 3-4 column space spaces are unequal, and the span is 30-47 m. 3-4 steel trusses 1 are respectively arranged on the top floors (11-12 floors) of each group of air corridor and are used as supporting systems, and 8-10 floors are used as lower hanging floors. The upper chord 5 and the lower chord 8 of the steel truss 1 are respectively supported on the section steel concrete columns 18 of the tower buildings on two sides. So that the air corridor forms a suspension structure system. Considering the problem of low redundancy of the suspension structure, the prestressed steel cables 4 are arranged in hollow areas inside the vertical rods 7 in the midspan area of the steel truss 1 and penetrate through the whole floor up and down, so that a second stress defense line is provided for an overhead corridor, the effective safety of the suspension structure system is ensured, and the safety, the reliability and the reasonable stress of the structure system can be ensured.
Fig. 7 is a schematic structural section view of an actual project in which embodiment 1 of the present invention is applied, that is, a C-C sectional view in fig. 6, in the actual project, 1 to 7 floors are two independent tower buildings in most areas, 8 to 12 floors are provided with aerial galleries to be connected into a whole, wherein 11 to 12 floors are provided with steel trusses 1 as a support system, and 8 to 10 floors are provided with steel columns 3 by hanging them at positions corresponding to vertical rods 7 in the steel trusses 1, so as to form a suspended structure system. Inside the montant 7 that is located the steel truss 1 and strides the well position, add prestressing force steel cable 4, provide second way defence line and safety guarantee for suspended structure.
Claims (9)
1. A suspension structure for additionally arranging a prestressed steel cable in a steel truss is characterized by comprising a steel truss (1), a steel frame beam (2), a steel column (3) and a prestressed steel cable (4), wherein the steel truss (1) comprises an upper chord (5), an inclined rod (6), a vertical rod (7) and a lower chord (8), the vertical rod (7) penetrates through the upper chord (5) and the lower chord (8) and connects the upper chord (5) and the lower chord (8) together, the lower end of the vertical rod (7) is vertically aligned and communicated with the steel column (3) in a lower hanging floor, the inclined rod (6) is obliquely connected between the upper chord (5) and the lower chord (8), the vertical rod (7) and the steel column (3) at the midspan position of the steel truss (1) penetrate through the prestressed steel cable (4), and the upper end and the lower end of the prestressed steel cable (4) are respectively provided with a tensioning end (11) and an anchoring end (12), the tensioning end (11) is fixed at the top of an upper chord (5) in the steel truss (1), and the anchoring end (12) is fixed at the bottom of a steel frame beam (2) at the bottommost layer in the lower hanging floor; the tensioning end (11) and the anchoring end (12) also comprise stiffening ribs (16), and the stiffening ribs (16) positioned at the tensioning end (11) are fixed on the inner wall of the vertical rod (7) and positioned within the height range of the upper chord (5) of the steel truss; and a stiffening rib (16) positioned at the anchoring end (12) is fixed on the inner wall of the steel column (3) and is positioned in the height range of the steel frame beam (2) at the bottommost layer of the lower hanging floor.
2. The suspension structure with the prestressed steel cables additionally arranged in the steel truss according to claim 1, is characterized in that: the vertical rods (7) and the steel columns (3) are steel pipes with rectangular or circular cross sections.
3. The suspension structure with the prestressed steel cables additionally arranged in the steel truss according to claim 1, is characterized in that: the outer side of the prestressed steel inhaul cable (4) is provided with a corrugated pipe (9).
4. The suspension structure with the prestressed steel cables additionally arranged in the steel truss according to claim 1, is characterized in that: the steel truss (1) is arranged on the top floor, is arranged on the plane and is located in the main axis direction, and occupies 1-2 floors in the height direction.
5. The suspension structure with the prestressed steel cables additionally arranged in the steel truss according to claim 1, is characterized in that: the prestressed steel cables (4) are firstly arranged in vertical rods (7) at midspan positions of the steel trusses (1) and are arranged in a penetrating mode in the building along the height direction of the whole overhead corridor.
6. The suspension structure with the prestressed steel cables added in the steel truss according to any one of claims 1 to 5, wherein: the tensioning end (11) and the anchoring end (12) comprise anchor plates (13) and nuts (14), wherein the anchor plates (13) are welded above the upper chord (5) and below the steel frame beam (2) hanging the bottommost floor of the floor, and are located at positions intersected with the vertical rods (7) and the steel columns (3), through holes for the prestressed steel cables (4) and the corrugated pipes (9) to penetrate through are formed in the anchor plates (13), the nuts (14) are sleeved on the outer periphery of the anchor plates (13), and after the prestressed steel cables (4) and the corrugated pipes (9) are installed in place, the nuts (14) are screwed on the threads pre-processed on the anchor plates (13) to be in place.
7. The suspension structure with the prestressed steel cables additionally arranged in the steel truss according to claim 6, is characterized in that: the stiffening ribs (16) are arranged along the full height or partial height of the upper chord (5) or the steel frame beam (2) in the steel truss (1).
8. The suspension structure with the prestressed steel cables additionally arranged in the steel truss according to claim 6, is characterized in that: the tensioning end (11) and the anchoring end (12) further comprise welding steel protective covers (15), and the welding steel protective covers (15) are sleeved on the outer surfaces of the nuts (14).
9. The suspension structure with the prestressed steel cables additionally arranged in the steel truss according to claim 6, is characterized in that: and the anti-corrosion grease (10) is coated on the outer surfaces of the prestressed steel cable (4), the anchor plate (13) and the nut (14) after the belt is tensioned in place in the areas of the tensioning end (11) and the anchoring end (12).
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| CN201911148308.XA CN110777938B (en) | 2019-11-21 | 2019-11-21 | Suspension structure for additionally arranging prestressed steel stay cable in steel truss |
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