CN112963028B - Construction method for assembled steel structure of overlong overhanging variable-section arc beam of stand - Google Patents
Construction method for assembled steel structure of overlong overhanging variable-section arc beam of stand Download PDFInfo
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- CN112963028B CN112963028B CN202110177900.3A CN202110177900A CN112963028B CN 112963028 B CN112963028 B CN 112963028B CN 202110177900 A CN202110177900 A CN 202110177900A CN 112963028 B CN112963028 B CN 112963028B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H3/00—Buildings or groups of buildings for public or similar purposes; Institutions, e.g. infirmaries or prisons
- E04H3/10—Buildings or groups of buildings for public or similar purposes; Institutions, e.g. infirmaries or prisons for meetings, entertainments, or sports
- E04H3/14—Gymnasiums; Other sporting buildings
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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
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
- E04B1/5825—Connections for building structures in general of bar-shaped building elements with a closed cross-section
- E04B1/5831—Connections for building structures in general of bar-shaped building elements with a closed cross-section of substantially rectangular form
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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
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
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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
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
- E04C2003/0408—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section
- E04C2003/0413—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section being built up from several parts
Abstract
The invention discloses an assembled steel structure of a stand overlong overhanging variable-section arc beam and a construction method thereof, wherein the assembled steel structure of the stand overlong overhanging variable-section arc beam comprises a plurality of steel structure assembled units, and each steel structure assembled unit comprises: the central support steel column is vertically arranged and is of a cylindrical structure; the cantilever variable cross-section box-type beams are radially arranged around the central support steel column at intervals, and the inner end parts of the cantilever variable cross-section box-type beams are respectively and fixedly connected with the upper part of the central support steel column; the outer end of each cantilever variable cross-section box-shaped beam is fixedly connected with the top of the central support steel column through the upper layer circular tube, and the outer end of each two adjacent cantilever variable cross-section box-shaped beams are fixedly connected through the upper layer circular tube.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a construction method for an assembled steel structure of a grandstand overlong overhanging variable-section arc beam.
Background
Many outdoor stadiums stands have adopted the arc gradual change cross-section box girder structural design of encorbelmenting at present, and its molding structure is novel pleasing to the eye, can satisfy the requirement of indoor outer air convection through stand penetrating system design all around and the ceiling moreover. But because arc gradual change cross-section box girder construction that encorbelments is mostly complicated special-shaped steel structure type to bring great construction degree of difficulty for the steel construction installation.
Patent CN02520017U discloses a stand variable cross section prestressing force formula of encorbelmenting book roof beam construction structures, it is including installing left and right row's pillar on the floor of lower floor the left row pillar top install left book roof beam the right row pillar top install right book roof beam the left and right book roof beam between the interval install many roof beams the roof beam on be connected with and see platen and upper floor, left and right book roof beam from the stand side and rise to connect by the decurrent section of encorbelmenting of striding, broken line section, transition broken line section, straight section in proper order and constitute left and right book roof beam in wear the bellows of prestressing steel. Adopt this structure to practice thrift steel, increase structural span, reduce the structure dead weight, improve service function, reduce concrete beam's vertical shear force and main tensile stress, simple structure, safe and reliable.
Patent CN204626642U discloses a structure of assembling of hyperbolic reducing steel structure cyclone, and the cyclone is installed on the curve arch, and the curve arch is the receipts limit component of steel sheet cyclone and with the lower extreme integral connection of cyclone, fixed roof is connected at the middle part of cyclone, the upper end and the steel construction bearing diagonal of cyclone are connected, the cross-section of cyclone changes along with the difference of distortion direction and spatial position. The utility model provides an overweight receipts limit curve of overlength arch and the support system problem of the disposable construction of hyperbolic structure steel sheet cyclone, the on-the-spot instability problem of concatenation of the overweight hyperbolic structure irregular steel sheet cyclone of overlength and the hoist and mount instability problem of the overweight hyperbolic structure steel sheet cyclone of overlength, have security, economic nature and suitability.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a construction method for an assembled steel structure of an overlong overhanging variable-section arc beam of a stand, which can ensure the realization of the shape of the arc box beam, reduce the self weight of a component, ensure the safety of the structure and meet the requirements of indoor and outdoor air convection.
In order to achieve the purpose, the invention provides an assembled steel structure of a stand overlong overhanging variable-section arc beam, which comprises a plurality of steel structure assembling units, wherein each steel structure assembling unit comprises: the central support steel column is vertically arranged and is of a cylindrical structure; the cantilever variable cross-section box-type beams are radially arranged around the central support steel column at intervals, and the inner end parts of the cantilever variable cross-section box-type beams are respectively and fixedly connected with the upper part of the central support steel column; the outer end of each cantilever variable cross-section box-shaped beam is fixedly connected with the top of the central support steel column through the upper layer circular tube, and the outer end of each two adjacent cantilever variable cross-section box-shaped beams are fixedly connected through the upper layer circular tube.
In one embodiment of the present invention, seven cantilevered variable-section box beams are provided in number, the seven cantilevered variable-section box beams are radially spaced around the central support steel column, each cantilevered variable-section box beam is formed by assembling a plurality of variable-section box beam units, and the heights of the longitudinal sections of the plurality of variable-section box beam units are sequentially reduced from the inner end portion to the outer end portion of the cantilevered variable-section box beam.
In one embodiment of the present invention, seven cantilever variable-section box-type beams are sequentially arranged in a counterclockwise direction as a first cantilever variable-section box-type beam, a second cantilever variable-section box-type beam, a sixth cantilever variable-section box-type beam, a fourth cantilever variable-section box-type beam, a third cantilever variable-section box-type beam, a fifth cantilever variable-section box-type beam, and a seventh cantilever variable-section box-type beam, wherein the first cantilever variable-section box-type beam and the second cantilever variable-section box-type beam are arranged outside the assembled steel structure of the grand stand ultra-long cantilever variable-section arc beam, the fourth cantilever variable-section box-type beam, the third cantilever variable-section box-type beam, and the fifth cantilever variable-section box-type beam are arranged inside the assembled steel structure of the grand stand ultra-long cantilever variable-section arc beam, and the first cantilever variable-section box-type beam and the second cantilever variable-section box-type beam are fixedly connected to an outer support steel column provided in a vertical direction, and the length of the overhanging variable-section box-type beam arranged on the inner side of the assembled steel structure of the overlong overhanging variable-section arc beam of the stand is greater than that of the overhanging variable-section box-type beam arranged on the outer side.
In one embodiment of the present invention, an angle between the first overhanging variable-section box beam and the second overhanging variable-section box beam is 38 °, an angle between the second overhanging variable-section box beam and the sixth overhanging variable-section box beam is 78 °, an angle between the sixth overhanging variable-section box beam and the fourth overhanging variable-section box beam is 45 °, an angle between the fourth overhanging variable-section box beam and the third overhanging variable-section box beam is 37 °, an angle between the third overhanging variable-section box beam and the fifth overhanging variable-section box beam is 25 °, an angle between the fifth overhanging variable-section box beam and the seventh overhanging variable-section box beam is 58 °, and an angle between the seventh overhanging variable-section box beam and the first overhanging variable-section box beam is 78 °.
In one embodiment of the present invention, each of the overhanging variable-section box girders is formed by assembling three variable-section box girder units, and the first variable-section box girder unit and the second variable-section box girder unit from the inner end of the overhanging variable-section box girder constitute an arc-shaped box girder structure protruding upward.
In an embodiment of the present invention, the diameter of the central support steel column is 1400mm, the diameter of the outer support steel column is 1100mm, the height difference between the top of the outer end portion and the bottom of the inner end portion of the second cantilever variable-section box beam is 10080mm, the height difference between the top of the outer end portion and the bottom of the inner end portion of the fourth cantilever variable-section box beam is 15200mm, the length of the upper round tube between the outer end portion of the first cantilever variable-section box beam and the outer end portion of the second cantilever variable-section box beam is 10200mm, the distance between the outer end portion of the first cantilever variable-section box beam and the central support steel column is 16300mm, the distance between the outer end portion of the fourth cantilever variable-section box beam and the outer end portion of the third cantilever variable-section box beam is 32290mm, the length of the upper round tube between the outer end portion of the fourth cantilever variable-section box beam and the outer end portion of the third cantilever variable-section box beam is 16800mm, and the length of the upper round tube between the outer end portion of the third cantilever variable-section box beam is 16800mm, and the fifth cantilever variable-section box beam are 16800mm, and the height of the cantilever variable-section box beam is equivalent structure mm.
The invention also provides a construction method for the assembled steel structure of the overlong overhanging variable-section arc beam of the stand, which comprises the following steps: assembling a plurality of overhanging variable cross-section box-type beams, and hoisting the assembled whole overhanging variable cross-section box-type beam; determining the connecting positions of a plurality of overhanging variable cross-section box-type beams on a central support steel column, and installing the central support steel column in a hanging manner; respectively welding a plurality of overhanging variable cross-section box-type beams on a central support steel column; and the outer end part of each cantilever variable cross-section box-shaped beam is fixedly connected with the top of the central support steel column through an upper layer circular tube, and the outer end parts of two adjacent cantilever variable cross-section box-shaped beams are fixedly connected through an upper layer circular tube.
In one embodiment of the present invention, assembling a plurality of overhanging variable cross-section box girders comprises the steps of: tamping soil on the assembly site, and compacting by adopting a gravel cushion layer with the thickness of 200 mm; paving a steel road base box base on the gravel cushion layer; manufacturing a plurality of assembled moulding beds by adopting H-shaped steel, wherein each assembled moulding bed comprises an H-shaped steel upright post and an H-shaped steel cross beam; fixing the H-shaped steel upright post of each assembled forming die on a steel road base box base; the top of each overhanging variable cross-section box girder is provided with a lifting lug plate for lifting, and each section of variable cross-section box girder unit of each overhanging variable cross-section box girder is supported by an H-shaped steel cross beam; and (4) butting and assembling the variable cross-section box girder units.
In one embodiment of the invention, the connection positions of a plurality of overhanging variable cross-section box-type beams are determined on a central support steel column, and the central support steel column is hung and installed; weld many variable cross section box girder welding of encorbelmenting respectively on the center support steel column includes: the method comprises the following steps that a first overhanging variable-section box type beam, a second overhanging variable-section box type beam, a sixth overhanging variable-section box type beam, a fourth overhanging variable-section box type beam, a third overhanging variable-section box type beam, a fifth overhanging variable-section box type beam and a seventh overhanging variable-section box type beam are arranged around a central support steel column at intervals in a radial mode along the anticlockwise direction, and the first overhanging variable-section box type beam, the second overhanging variable-section box type beam, the sixth overhanging variable-section box type beam, the fourth overhanging variable-section box type beam, the third overhanging variable-section box type beam, the fifth overhanging variable-section box type beam and the seventh overhanging variable-section box type beam are welded on the central support steel column respectively; the included angle between the first overhanging variable-section box-shaped beam and the second overhanging variable-section box-shaped beam is 38 degrees, the included angle between the second overhanging variable-section box-shaped beam and the sixth overhanging variable-section box-shaped beam is 78 degrees, the included angle between the sixth overhanging variable-section box-shaped beam and the fourth overhanging variable-section box-shaped beam is 45 degrees, the included angle between the fourth overhanging variable-section box-shaped beam and the third overhanging variable-section box-shaped beam is 37 degrees, the included angle between the third overhanging variable-section box-shaped beam and the fifth overhanging variable-section box-shaped beam is 25 degrees, the included angle between the fifth overhanging variable-section box-shaped beam and the seventh overhanging variable-section box-shaped beam is 58 degrees, and the included angle between the seventh overhanging variable-section box-shaped beam and the first overhanging variable-section box-shaped beam is 78 degrees.
In one embodiment of the present invention, the welding of the first overhanging variable-section box girder, the second overhanging variable-section box girder, the sixth overhanging variable-section box girder, the fourth overhanging variable-section box girder, the third overhanging variable-section box girder, the fifth overhanging variable-section box girder and the seventh overhanging variable-section box girder to the center support steel column includes the steps of: erecting an assembling jig frame; a ruler for mounting each cantilever variable cross-section box-type beam is manufactured on a central support steel column, and rechecking is performed before mounting; installing a first overhanging variable cross-section box-type beam and a second overhanging variable cross-section box-type beam which are fixedly connected with an outer side supporting steel column; installing a third overhanging variable-cross-section box-shaped beam, and additionally welding flitch plates with the thickness of 40mm on two sides of the third overhanging variable-cross-section box-shaped beam after the third overhanging variable-cross-section box-shaped beam is welded with the central support steel column; installing a fourth overhanging variable cross-section box-type beam and a fifth overhanging variable cross-section box-type beam, and reserving an operating hand hole with the width of 400mm and the height of the operating hand hole same as the beam height at the root of the side faces of the fourth overhanging variable cross-section box-type beam and the fifth overhanging variable cross-section box-type beam, which face away from the third overhanging variable cross-section box-type beam, before installation; respectively welding and connecting the fourth overhanging variable cross-section box-shaped beam and the fifth overhanging variable cross-section box-shaped beam with the flitch in an emptying mode through an operating hand hole reserved on the side surface, wherein the grade of a welding line is one grade, and detecting the welding line; after the welding seam is detected to be qualified, covering side operation hand holes of a fourth overhanging variable cross-section box-shaped beam and a fifth overhanging variable cross-section box-shaped beam; installing a sixth overhanging variable cross-section box-shaped beam and a seventh overhanging variable cross-section box-shaped beam, and performing primary weld joint detection after welding is completed; and (4) completely installing the seven overhanging variable cross-section box-type beams, and dismantling the jig frame according to the requirement of an unloading scheme.
Compared with the prior art, the construction method for the assembled steel structure of the overlong overhanging variable-section arc-shaped beam of the stand has the following advantages that: the assembled steel structure of the overlong overhanging variable-section arc beam of the stand is provided with the central support steel column, and the overhanging variable-section box-type beams are radially arranged around the central support steel column at intervals, so that a palm tree-shaped appearance structure is formed. In addition, the construction method of the invention also creatively adopts a welding mode of welding the dense beam part with a narrow included angle by welding the dense beam part with the flitch plates which are hollowed out after the dense beam part is arranged in the middle, thereby effectively ensuring the welding quality.
Drawings
Fig. 1 is a schematic sectional view of a steel structure erection unit according to an embodiment of the present invention.
Fig. 2 is a schematic plan view of a steel construction assembled unit according to an embodiment of the present invention.
Fig. 3 is a top view of a connection node of seven overhanging variable cross-section box beams and a central support steel column according to an embodiment of the invention.
Fig. 4 is a schematic ground assembly view of an overhanging variable cross-section box girder according to an embodiment of the present invention.
Fig. 5 is a ground assembly sectional view of an overhanging variable cross-section box girder according to an embodiment of the present invention.
Fig. 6 is a perspective view of an overhanging variable cross-section box girder according to an embodiment of the present invention.
Fig. 7 is a schematic view of a fourth overhung variable cross-section box beam undermining weld according to an embodiment of the invention.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Example 1
As shown in fig. 1, the assembled steel structure of the overlong overhanging variable cross-section arc beam of the stand according to the preferred embodiment of the present invention includes a plurality of integrally connected steel structure assembled units, each of which includes: a central supporting steel column 101, an overhanging variable cross-section box-type beam 102 and an upper round pipe 103. The center support steel column 101 is vertically arranged, and the center support steel column 101 is of a cylindrical structure. The cantilever variable-section box-type beams 102 are provided with a plurality of cantilever variable-section box-type beams 102, the cantilever variable-section box-type beams 102 are radially arranged around the central support steel column 101 at intervals, and the inner ends of the cantilever variable-section box-type beams 102 are respectively fixedly connected with the upper part of the central support steel column 101. The outer end of each cantilever variable cross-section box-type beam 102 is fixedly connected with the top of the central support steel column 101 through an upper layer circular tube 103, and the outer ends of two adjacent cantilever variable cross-section box-type beams 102 are fixedly connected through the upper layer circular tube 103. The number of the overhanging variable cross-section box-shaped beams 102 is at most seven, and each overhanging variable cross-section box-shaped beam 102 is formed by assembling a plurality of sections of variable cross-section box-shaped beam units. The plurality of overhanging variable cross-section box-shaped beams 102 are radially projected to the periphery around the central support steel column 101 to form a palm tree-shaped modeling steel structure, and the periphery of the stand and the ceiling are designed into a transparent system, so that the requirement of indoor and outdoor air convection is well met. And an outer supporting steel column 104 connected with the outer end part of the overhanging variable-section box-type beam 102 is also arranged on the outer side of the assembled steel structure of the overlong overhanging variable-section arc beam of the stand.
Example 2
In this embodiment, as shown in fig. 2 to 3, seven cantilevered variable-section box-type beams are provided, the seven cantilevered variable-section box-type beams are radially spaced around the central support steel column 101, and each cantilevered variable-section box-type beam is formed by assembling multiple sections of variable-section box-type beam units. The heights of the longitudinal sections of the multi-section variable cross-section box girder units are sequentially reduced from the inner end part to the outer end part of the cantilever variable cross-section box girder 102, as shown in fig. 6, so that the self-weight of the members is favorably reduced, and the structural safety is ensured.
Specifically, as shown in fig. 3, seven overhanging variable-section box beams are sequentially arranged in the counterclockwise direction as a first overhanging variable-section box beam 201, a second overhanging variable-section box beam 202, a sixth overhanging variable-section box beam 206, a fourth overhanging variable-section box beam 204, a third overhanging variable-section box beam 203, a fifth overhanging variable-section box beam 205, and a seventh overhanging variable-section box beam 207. The first cantilever variable-section box-type beam 201 and the second cantilever variable-section box-type beam 202 are arranged on the outer side of an assembled steel structure of the overlong cantilever variable-section arc beam of the stand, and the fourth cantilever variable-section box-type beam 204, the third cantilever variable-section box-type beam 203 and the fifth cantilever variable-section box-type beam 205 are arranged on the inner side of the assembled steel structure of the overlong cantilever variable-section arc beam of the stand. The outer end portions of the first cantilever variable-section box-shaped beam 201 and the second cantilever variable-section box-shaped beam 202 are fixedly connected with an outer supporting steel column 104 arranged in the vertical direction respectively, and the length of the cantilever variable-section box-shaped beam arranged on the inner side of the assembled steel structure of the overlong cantilever variable-section arc beam of the stand is larger than the length of the cantilever variable-section box-shaped beam arranged on the outer side. In addition, a transverse stiffening rib 106 is also provided above the root of the overhanging variable cross-section box beam.
Further, an included angle between the first overhanging variable-cross-section box-shaped beam 201 and the second overhanging variable-cross-section box-shaped beam 202 is 38 °, an included angle between the second overhanging variable-cross-section box-shaped beam 202 and the sixth overhanging variable-cross-section box-shaped beam 206 is 78 °, an included angle between the sixth overhanging variable-cross-section box-shaped beam 206 and the fourth overhanging variable-cross-section box-shaped beam 204 is 45 °, an included angle between the fourth overhanging variable-cross-section box-shaped beam 204 and the third overhanging variable-cross-section box-shaped beam 203 is 37 °, an included angle between the third overhanging variable-cross-section box-shaped beam 203 and the fifth overhanging variable-cross-section box-shaped beam 205 is 25 °, an included angle between the fifth overhanging variable-cross-section box-shaped beam 205 and the seventh overhanging variable-cross-section box-shaped beam 207 is 58 °, and an included angle between the seventh overhanging variable-section box-shaped beam 207 and the first overhanging variable-cross-section box-shaped beam 201 is 78 °.
In this embodiment, the diameter of the central support steel column 101 is 1400mm, the diameter of the outer support steel column 104 is 1100mm, the height difference between the top of the outer end portion and the bottom of the inner end portion of the second overhanging variable-section box-shaped beam 202 is 10080mm, the height difference between the top of the outer end portion and the bottom of the inner end portion of the fourth overhanging variable-section box-shaped beam 204 is 15200mm, the length of the upper round tube 103 between the outer end portion of the first overhanging variable-section box-shaped beam 101 and the outer end portion of the second overhanging variable-section box-shaped beam 202 is 10200mm, the distance between the outer end portion of the first overhanging variable-section box-shaped beam 201 and the central support steel column 101 is 16300mm, the distance between the outer end portion of the fourth overhanging variable-section box-shaped beam 204 and the central support steel column 101 is 32290mm, the length of the upper round tube 103 between the outer end portion of the fourth overhanging variable-section box-shaped beam 204 and the outer end portion of the third overhanging variable-section box-shaped beam 203 is 16800mm, the length of the upper round pipe 103 between the outer end of the third overhanging variable cross-section box beam 203 and the outer end of the fifth overhanging variable cross-section box beam 205 is 10800 mm.
According to the invention, the seven overhanging variable cross-section box-type beams are arranged at the upper part of the central supporting steel column 101, and the longitudinal section height of each overhanging variable cross-section box-type beam is sequentially reduced from the inner end part to the outer end part and has a certain radian, so that a palm tree-shaped model is integrally formed, and the stability and the safety of the palm tree-shaped model meet the design requirements through mechanical calculation verification.
Example 3
The invention also provides a construction method for the assembled steel structure of the overlong overhanging variable-section arc beam of the stand, which comprises the following steps: assembling a plurality of overhanging variable cross-section box-type beams, and hoisting the assembled whole overhanging variable cross-section box-type beam; determining the connecting positions of a plurality of overhanging variable cross-section box-type beams on a central support steel column, and installing the central support steel column in a hanging manner; respectively welding a plurality of overhanging variable cross-section box-type beams on a central support steel column; and the outer end part of each cantilever variable cross-section box-shaped beam is fixedly connected with the top of the central support steel column through an upper layer circular tube, and the outer end parts of two adjacent cantilever variable cross-section box-shaped beams are fixedly connected through an upper layer circular tube.
Further, as shown in fig. 4-5, the assembled 503 overhanging variable cross-section box-shaped beam adopts a horizontal assembly mode, in order to ensure the assembly precision of components and prevent assembly errors caused by uneven settlement of a temporary support jig during the assembly process, soil 501 is tamped in an assembly field, a 200mm thick gravel cushion layer 502 is compacted, and then a steel roadbed box base 503 is laid on the gravel cushion layer 502. Adopt a plurality of assembling child moulds of H shaped steel preparation, wherein, every assembles the child mould and includes H shaped steel stand 504 and H shaped steel crossbeam 505, fix every H shaped steel stand 504 of assembling the child mould on steel roadbed box base 503, set up hoist and mount otic placode 506 at the variable cross section box roof beam top of encorbelmenting and hoist, and utilize H shaped steel crossbeam 505 to support every variable cross section box roof beam unit of encorbelmenting of variable cross section box roof beam 102, and the both sides of encorbelmenting variable cross section box roof beam 102 are fixed a position through location splint 508. And finally, butting and assembling the variable cross-section box girder units. The first section of variable cross-section box girder unit 311 and the second section of variable cross-section box girder unit 312 from the inner end part of the cantilever variable cross-section box girder form an arc-shaped box girder structure protruding upwards, the welding seam position is avoided by selecting the lifting point of the arc-shaped box girder, the deformation is ensured during the hoisting process through strict stress calculation on the arc-shaped convex surface, and the lifting rope 507 forms an included angle of 45 degrees with the horizontal direction.
Specifically, during installation of the cantilever variable cross-section box-type beam, a supporting steel column base embedded plate is embedded according to design requirements during construction of a concrete structure, whether the embedded plate is accurate or not is judged, the upper palm tree-shaped forming effect is directly influenced, and therefore not only is the position of each supporting steel column embedded plate accurate, but also the position between each supporting steel column and each supporting steel column is accurate. The method comprises the steps that when the concrete strength reaches a design rule, a center support steel column is hung and installed, before hanging and installing, a ruler of the connection position of each overhanging variable cross-section box-type beam needs to be checked at the center support steel column, after the center support steel column is installed, the position and the size need to be checked, and after the center support steel column is installed, welding construction of the overhanging variable cross-section box-type beam is carried out.
Example 4
In the embodiment, as shown in fig. 1-3, the connection positions of a plurality of overhanging variable cross-section box-type beams are determined on a central support steel column, and the central support steel column is hung and installed; weld many variable cross section box girder welding of encorbelmenting respectively on center support steel column 101 includes: the first overhanging variable-section box-type beam 201, the second overhanging variable-section box-type beam 202, the sixth overhanging variable-section box-type beam 206, the fourth overhanging variable-section box-type beam 204, the third overhanging variable-section box-type beam 203, the fifth overhanging variable-section box-type beam 205 and the seventh overhanging variable-section box-type beam 207 are radially arranged around the central support steel column 101 at intervals in the counterclockwise direction, and the first overhanging variable-section box-type beam 201, the second overhanging variable-section box-type beam 202, the sixth overhanging variable-section box-type beam 206, the fourth overhanging variable-section box-type beam 204, the third overhanging variable-section box-type beam 203, the fifth overhanging variable-section box-type beam 205 and the seventh overhanging variable-section box-type beam 207 are respectively welded on the central support steel column 101.
Further, an included angle between the first overhanging variable-cross-section box-shaped beam 201 and the second overhanging variable-cross-section box-shaped beam 202 is 38 °, an included angle between the second overhanging variable-cross-section box-shaped beam 202 and the sixth overhanging variable-cross-section box-shaped beam 206 is 78 °, an included angle between the sixth overhanging variable-cross-section box-shaped beam 206 and the fourth overhanging variable-cross-section box-shaped beam 204 is 45 °, an included angle between the fourth overhanging variable-cross-section box-shaped beam 204 and the third overhanging variable-cross-section box-shaped beam 203 is 37 °, an included angle between the third overhanging variable-cross-section box-shaped beam 203 and the fifth overhanging variable-cross-section box-shaped beam 205 is 25 °, an included angle between the fifth overhanging variable-cross-section box-shaped beam 205 and the seventh overhanging variable-cross-section box-shaped beam 207 is 58 °, and an included angle between the seventh overhanging variable-section box-shaped beam 207 and the first overhanging variable-cross-section box-shaped beam 201 is 78 °. In the embodiment, the diameter of the central supporting steel column 101 is 1400mm, the diameter of the outer supporting steel column 104 is 1100mm, and the distance between the outer end of the fourth overhanging variable-section box-type beam 204 and the central supporting steel column 101 reaches 32290 mm.
Specifically, the welding of the first cantilever variable cross-section box beam 201, the second cantilever variable cross-section box beam 202, the sixth cantilever variable cross-section box beam 206, the fourth cantilever variable cross-section box beam 204, the third cantilever variable cross-section box beam 203, the fifth cantilever variable cross-section box beam 205 and the seventh cantilever variable cross-section box beam 207 on the center support steel column 101 respectively comprises the following steps:
1. and (5) erecting an assembling jig frame.
Specifically, the assembly jig frame adopts a double-limb lattice type jig frame, the upright posts adopt 150 × 8 square tubes, and the web members adopt 80 × 6 square tubes; the top is provided with a conversion platform which is made of 200X 150X 8X 10 section steel; the bottom of the jig frame is provided with a conversion beam, the conversion beam adopts 250X 9X 12 section steel and is welded with the stage floor slab through an embedded plate pre-embedded in advance; the assembling jig frame is provided with a vertical ladder stand for going up and down a channel, and a springboard is laid on the top platform and a life line is pulled. And wind-holding ropes are pulled at the height position of the assembling jig 2/3.
2. And (5) mounting the cantilever variable-section box-type beam.
As shown in fig. 2-3 and 7, to weld seven overhanging variable cross-section box-type beams on the upper part of a central supporting steel column with a diameter of 1400mm, and to ensure the weld quality of the welded part, because the first section of variable cross-section box-type beam unit 311 and the second section of variable cross-section box-type beam unit 312 from the inner end part of the overhanging variable cross-section box-type beam are arc-shaped box-type beam structures, which are rooted at the column head part of the central supporting steel column 101, the included angle between the root parts of the overhanging variable cross-section box-type beams is narrow, and particularly, the minimum included angle between the third overhanging variable cross-section box-type beam 203, the fourth overhanging variable cross-section box-type beam 204 and the fifth overhanging variable cross-section box-type beam 205 is 25 °, and there is insufficient welding operation space, and the operation space of a hand and a welding handle is insufficient according to a normal welding method, and welding and weld detection cannot be performed. Therefore, the invention creatively adopts a construction method of welding the hollowed flitch plates at the middle part and the two sides at the back part, which comprises the following steps:
1) installing a first overhanging variable cross-section box-type beam 201 and a second overhanging variable cross-section box-type beam 202 which are fixedly connected with the outer side supporting steel column 104;
2) installing a third overhanging variable cross-section box-shaped beam 203, and additionally welding flitch plates 105 with the thickness of 40mm on two sides of the third overhanging variable cross-section box-shaped beam 203 after the third overhanging variable cross-section box-shaped beam 203 is welded with the central support steel column 101;
3) installing a fourth overhanging variable cross-section box-type beam 204 and a fifth overhanging variable cross-section box-type beam 205, and reserving an operating hand hole 701 with the width of 400mm and the height equal to the beam height at the root of the side face, back to the third overhanging variable cross-section box-type beam, of the fourth overhanging variable cross-section box-type beam 204 and the fifth overhanging variable cross-section box-type beam 205 before installation;
4) respectively welding the fourth overhanging variable cross-section box-shaped beam 204 and the fifth overhanging variable cross-section box-shaped beam 205 with the flitch 105 in an emptying mode through an operating hand hole 701 reserved on the side surface, wherein the grade of a welding line is one grade, and detecting the welding line;
5) after the welding seam is detected to be qualified, the side operation hand holes 701 of the fourth overhanging variable cross-section box-shaped beam 204 and the fifth overhanging variable cross-section box-shaped beam 205 are covered;
6) installing a sixth overhanging variable cross-section box-shaped beam 206 and a seventh overhanging variable cross-section box-shaped beam 107, and performing primary weld joint detection after welding is completed;
7) and (4) completely installing the seven overhanging variable cross-section box-type beams, and dismantling the jig frame according to the requirement of an unloading scheme.
Therefore, the construction method of welding the hollowed flitch plates at the middle part and the two sides at the front part can be adopted for the parts of the dense beams with narrow operation included angles.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (7)
1. A construction method for an assembled steel structure of a grandstand overlong overhanging variable-section arc beam is characterized by comprising the following steps:
assembling a plurality of overhanging variable cross-section box-type beams, and hoisting the assembled whole overhanging variable cross-section box-type beam;
determining the connecting positions of a plurality of overhanging variable cross-section box-type beams on a central support steel column, and installing the central support steel column in a hanging manner;
welding a plurality of cantilever variable cross-section box-shaped beams on the upper part of the central support steel column at intervals in a radial shape around the central support steel column;
the outer end part of each cantilever variable cross-section box-shaped beam is fixedly connected with the top of the central support steel column through an upper layer circular tube, and the outer end parts of two adjacent cantilever variable cross-section box-shaped beams are fixedly connected through the upper layer circular tube;
determining the connection positions of a plurality of overhanging variable cross-section box-type beams on a central support steel column, and installing the central support steel column in a hanging manner; respectively with many the welding of encorbelmenting variable cross section box girder include on the center support steel column: center on the center support steel column and radially set up the interval that first encorbelment variable cross section box girder, second encorbelment variable cross section box girder, the variable cross section box girder is encorbelmented to the sixth, the variable cross section box girder is encorbelmented to the fourth, the variable cross section box girder is encorbelmented to the third, the variable cross section box girder is encorbelmented to the fifth and the variable cross section box girder is encorbelmented to the seventh, and will respectively first encorbelmenting variable cross section box girder, the second encorbelmenting variable cross section box girder, the variable cross section box girder is encorbelmented to the sixth, the variable cross section box girder is encorbelmented to the fourth, the third is encorbelmented variable cross section box girder, the variable cross section box girder is encorbelmented to the fifth and the variable cross section box girder is encorbelmented to the seventh welds on the center support steel column, specifically include the following step:
erecting an assembling jig frame;
a ruler for mounting each cantilever variable-section box-type beam is manufactured on the central support steel column, and rechecking is performed before mounting;
installing a first overhanging variable cross-section box-type beam and a second overhanging variable cross-section box-type beam which are fixedly connected with an outer side supporting steel column;
installing a third cantilever variable-section box-type beam, and additionally welding flitch plates with the thickness of 40mm on two sides of the third cantilever variable-section box-type beam after the third cantilever variable-section box-type beam is welded with the central support steel column;
installing a fourth overhanging variable cross-section box-type beam and a fifth overhanging variable cross-section box-type beam, and reserving operation hand holes with the width of 400mm and the height of the operation hand holes with the same height as the beam height at the root parts of the side surfaces of the fourth overhanging variable cross-section box-type beam and the fifth overhanging variable cross-section box-type beam, which are back to the third overhanging variable cross-section box-type beam, before installation;
respectively welding and connecting the fourth overhanging variable cross-section box-shaped beam and the fifth overhanging variable cross-section box-shaped beam with the flitch in an emptying mode through an operating hand hole reserved on the side surface, wherein the grade of a welding line is one grade, and detecting the welding line;
after the welding seam is detected to be qualified, the side operation hand holes of the fourth overhanging variable cross-section box-shaped beam and the fifth overhanging variable cross-section box-shaped beam are covered;
installing a sixth overhanging variable cross-section box-shaped beam and a seventh overhanging variable cross-section box-shaped beam, and performing primary weld joint detection after welding is completed;
and (4) completely installing the seven overhanging variable cross-section box-type beams, and dismantling the jig frame according to the requirement of an unloading scheme.
2. The construction method according to claim 1, wherein said assembling a plurality of overhanging variable cross-section box girders comprises the steps of:
tamping soil on the assembly site, and compacting by adopting a gravel cushion layer with the thickness of 200 mm;
paving a steel road base box base on the gravel cushion layer;
manufacturing a plurality of assembled moulding beds by adopting H-shaped steel, wherein each assembled moulding bed comprises an H-shaped steel upright post and an H-shaped steel cross beam;
fixing the H-shaped steel upright post of each assembled forming die on the steel road foundation box base;
arranging a lifting lug plate at the top of the overhanging variable cross-section box girder for lifting, and supporting each section of variable cross-section box girder unit of each overhanging variable cross-section box girder by using an H-shaped steel cross beam;
and (4) butting and assembling the variable cross-section box girder units.
3. The method of claim 2, wherein the angle between the first cantilevered variable-section box beam and the second cantilevered variable-section box beam is 38 degrees, the included angle between the second overhanging variable cross-section box-shaped beam and the sixth overhanging variable cross-section box-shaped beam is 78 degrees, the included angle between the sixth overhanging variable cross-section box-shaped beam and the fourth overhanging variable cross-section box-shaped beam is 45 degrees, the included angle between the fourth overhanging variable cross-section box-shaped beam and the third overhanging variable cross-section box-shaped beam is 37 degrees, the included angle between the third overhanging variable cross-section box-shaped beam and the fifth overhanging variable cross-section box-shaped beam is 25 degrees, the included angle between the fifth overhanging variable cross-section box-shaped beam and the seventh overhanging variable cross-section box-shaped beam is 58 degrees, and the included angle between the seventh overhanging variable cross-section box-shaped beam and the first overhanging variable cross-section box-shaped beam is 78 degrees.
4. The construction method as claimed in claim 3, wherein each of the cantilever variable-section box girders is assembled by multi-sectional variable-section box girder units, and the height of the longitudinal section of the multi-sectional variable-section box girder units is sequentially decreased from an inner end portion to an outer end portion of the cantilever variable-section box girder.
5. The construction method according to claim 4, wherein the first overhanging variable-section box-type beam and the second overhanging variable-section box-type beam are arranged on the outer side of an assembled steel structure of the grandstand ultra-long overhanging variable-section arc beam, the fourth overhanging variable-section box-type beam, the third overhanging variable-section box-type beam and the fifth overhanging variable-section box-type beam are arranged on the inner side of the assembled steel structure of the grandstand ultra-long overhanging variable-section arc beam, the outer end portions of the first overhanging variable-section box-type beam and the second overhanging variable-section box-type beam are respectively and fixedly connected with an outer support steel column arranged in the vertical direction, and the length of the overhanging variable-section box-type beam arranged on the inner side of the assembled steel structure of the grandstand ultra-long overhanging variable-section arc beam is greater than that of the overhanging variable-section box-type beam arranged on the outer side.
6. The construction method according to claim 4, wherein each of the cantilever variable-section box girders is assembled by three variable-section box girder units, and the first and second variable-section box girder units from the inner end of the cantilever variable-section box girder constitute an arc-shaped box girder structure protruding upward.
7. The construction method according to claim 5, wherein the diameter of the central support steel column is 1400mm, the diameter of the outer support steel column is 1100mm, the height difference between the top of the outer end portion and the bottom of the inner end portion of the second overhanging variable-cross-section box-type beam is 10080mm, the height difference between the top of the outer end portion and the bottom of the inner end portion of the fourth overhanging variable-cross-section box-type beam is 15200mm, the length of the upper round pipe between the outer end portion of the first overhanging variable-cross-section box-type beam and the outer end portion of the second overhanging variable-cross-section box-type beam is 10200mm, the distance between the outer end portion of the first overhanging variable-cross-section box-type beam and the central support steel column is 16300mm, the distance between the outer end portion of the fourth overhanging variable-cross-section box-type beam and the outer end portion of the third overhanging variable-section box-type beam is 16800mm, the length of an upper layer circular pipe between the outer end part of the third overhanging variable cross-section box-shaped beam and the outer end part of the fifth overhanging variable cross-section box-shaped beam is 10800 mm.
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| CN103174309A (en) * | 2013-03-20 | 2013-06-26 | 中天建设集团有限公司 | Umbrella-shaped finalization shed |
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