CN115030317B - Large-span truss ceiling without prestress component - Google Patents
Large-span truss ceiling without prestress component Download PDFInfo
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- CN115030317B CN115030317B CN202210720631.5A CN202210720631A CN115030317B CN 115030317 B CN115030317 B CN 115030317B CN 202210720631 A CN202210720631 A CN 202210720631A CN 115030317 B CN115030317 B CN 115030317B
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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
- E04B1/342—Structures covering a large free area, whether open-sided or not, e.g. hangars, halls
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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
- E04C2003/0486—Truss like structures composed of separate truss elements
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Abstract
The invention relates to the technical field of structures covering large-area spaces, and discloses a large-span truss ceiling without prestress members, which is used for buildings requiring continuous large spaces, wherein truss ceilings are formed by stacking ceiling units, and then supporting structures are arranged below the ceiling units at the highest position and the lowest position; deformation trends of two sides of a joint between the ceiling units are opposite, deformation of different ceiling units cannot be accumulated, so that rigidity of the whole truss ceiling is obviously improved, and deformation is not easy to occur on the premise that a prestress component is not introduced. The lower ends of the lattice columns are contracted to be a point, and the special-shaped trusses are turned over and lifted in a mode of changing the length of the lifting rope by taking the lower ends of the lattice columns as fulcrums, so that various special-shaped trusses are smoothly lifted. Through making building inner space be in the fan plane scope of using the front door as the point, when the truss ceiling uses as the exhibition hall, the people of entering the door can see all showings in whole exhibition hall at a glance, can grasp the showings distribution in the exhibition hall fast.
Description
Technical Field
The invention relates to the technical field of structures covering large-area spaces, in particular to a large-span truss ceiling without prestress components.
Background
Large-span single-body buildings such as workshops, gymnasiums, natatorium, exhibition halls and the like are suitable for truss roofs with small dead weights and high strength. However, when the span is large, the truss roof is not rigid enough to maintain its shape, and is prone to buckling deformation. For the building such as a factory building, the problem can be solved by adopting a mode of making the truss roof into a multi-span structure, namely, arranging the support columns which are arranged in a matrix shape, and reducing the interval between the two support columns.
However, in the case of a building such as a gym/natatorium/exhibition hall, there are many places under the roof where the support column cannot be provided, such as a court, a swimming pool, an exhibition area, etc., the provision of the support column is limited. In the prior art, the rigidity of the roof is increased mainly by introducing a prestress component, so that the problem caused by overlarge span is solved.
The introduction of the prestressing members, however, brings about the following two new problems:
1. shortened life time
Unlike the prestressed members in reinforced concrete, the outer wrapping layer of the prestressed members in the truss is not available, and the outer wrapping layer can gradually yield after being subjected to prestressing for a long time, so that the prestressing force gradually disappears, the service life of the building is limited within a period of time when the prestressing force can ensure enough rigidity of the roof, and the service life of the whole building is obviously shortened;
2. construction period is prolonged
The stress condition in the prestressed building is far more complex than that of the conventional building, finite element software is adopted for stress analysis before construction, and a stretching and releasing plan is formulated according to the analysis result so as to ensure that the strength of the prestressed building is qualified; meanwhile, after the truss construction is finished, the truss needs to be tensioned and released step by step, and because the roof area is large, the positions where the truss needs to be tensioned and released are many, and the prestress needs to be loaded step by step in each tensioning. The construction period of stretching and releasing is very much longer than that of truss assembly.
In addition, because the truss can be freely assembled into a required shape according to requirements, the required shape is realized by means of the special-shaped truss in many special-shaped buildings, but the truss is dangerous and inefficient to assemble in situ at high altitude, so that the truss is generally hung or lifted to an installation position to complete connection after assembling on a jig frame on the ground. However, when the truss is assembled on the ground, the posture of the truss is completely different from the posture of the truss in the building, the truss must be turned over during lifting, namely the posture of the truss is adjusted from the posture on the jig frame to the posture of the truss in the building, a plurality of cranes are required to be matched in the process, and a plurality of transverse haulage ropes are required to be arranged for posture fine adjustment and control, so that the construction efficiency is low and a large number of people are required to be occupied. Taking the international convention and exhibition center related to the application as an example, a large number of -shaped trusses are used in construction, and turning over and lifting of the trusses are difficult.
Disclosure of Invention
The invention provides a large-span truss ceiling without a prestressing member.
The technical problems to be solved are as follows: in the existing large-span truss ceiling, when the support columns are limited, prestress components are required to be introduced, but the introduction of the prestress components can lead to shortened service life of the building and prolonged construction period.
In order to solve the technical problems, the invention adopts the following technical scheme: a large span truss ceiling without prestressing members for buildings requiring a continuous large space; the ceiling comprises a plurality of ceiling units which are arranged side by side and are fixedly connected with each other, each ceiling unit is formed by splicing a plurality of bridge-shaped frames which are arranged side by side along the arranging direction of the ceiling unit and are fixedly connected with each other, each bridge-shaped frame comprises a truss girder and lattice columns which are propped under two ends of the truss girder, two side vertical faces of the positions of the lattice columns in each ceiling unit are recorded as unit end faces, and side vertical faces of the left side and the right side of the ceiling unit are recorded as unit side faces;
among the ceiling units, the ceiling unit with the highest height is called as the highest unit, and the rest ceiling units are gradually shortened from the highest unit to two sides; and one end of the bottom of the highest unit and the bottoms of the outer edges of the two outermost ceiling units are respectively provided with a supporting structure for supporting the whole truss ceiling.
Further, the ceiling units other than the highest unit are symmetrically arranged on the left and right sides of the highest unit.
Further, the truss ceiling is an exhibition hall, the front door of the exhibition hall is arranged on one unit end face of the highest unit, the end faces, close to the front door of the exhibition hall, of the two unit end faces of each ceiling unit are marked as near-door end faces, and each near-door end face is gradually retracted from the front door of the exhibition hall to two sides of the exhibition hall.
Further, the bearing structure of highest unit bottom is the intermediate strut frame, the intermediate strut frame includes a row of support columns that set up along the ceiling unit direction of putting interval, and each support column is as an organic whole through linking the roof beam, the intermediate strut frame sets up in the position that is close to the front door of exhibition hall, and leaves the space that is used as the hall between intermediate strut frame and the front door.
Further, the top of the bridge frame gradually becomes lower from the end face of the door to the other end, and the lattice column at the position of the end face of the door is bent inwards.
Further, each ceiling unit except the highest unit is respectively marked as a left 1 unit, a left 2 unit, a left 3 unit … … left N unit, a right 1 unit, a right 2 unit, a right 3 unit … … right N unit from the highest unit, and an anti-wind support frame is arranged in the middle of the lower part of the ceiling unit with the serial number of an odd number, and comprises two support columns arranged at intervals along the extending direction of the bridge-shaped frame, and the two support columns are connected into a whole through a connecting beam to form a door-type rigid frame.
Further, adjacent ceiling units are fixedly connected through embedded rod pieces, adjacent bridge-shaped frames in the same ceiling unit are fixedly connected through embedded rod pieces, and lattice columns at the end face positions of the units are connected into a whole to form a wall body; the support structure at the bottom of the outer side edges of the two outermost ceiling units is edge support columns, and the edge support columns are arranged at intervals along the extending direction of the bridge-shaped frame.
Further, the truss girders in the bridge-shaped frames are box-shaped trusses with rectangular cross sections, the elevation of each upper chord of the truss girders is the same, and the elevation of each lower chord of the truss girders is the same; the two ends of the truss girder are downwards bent to form a lattice column, and the lower end of the lattice column is contracted into a point; the truss girder is formed by welding and splicing a plurality of truss sections end to end, and the truss sections comprise two end sections positioned at two ends of a bridge-shaped frame and a plurality of middle sections positioned between the end sections;
in the ground assembly state, the end section and the lattice column are assembled into an integral component, the end section is arranged on the jig frame in a mode that the side elevation is close to the bottom of the jig frame, at least two cross sections of the end section are respectively provided with three hanging points, the three hanging points on the same cross section are respectively arranged on two upper chords and a lower chord at the highest position, the hanging points on the lower chords are marked as extension hanging points, the hanging points on the upper chords at the highest position are marked as fixed hanging points, and the hanging points on the upper chords at the lowest position are marked as shortening hanging points.
Furthermore, the bottoms of the latticed columns are provided with gaps for installing temporary supporting columns or permanent filling columns, and filling columns for reinforcing the bearing capacity of the latticed columns are arranged at the bottoms of the latticed columns of the two outermost ceiling units;
the lattice column comprises a box-type truss column at the upper half part and a plane truss column at the lower half part, wherein the plane truss column is coplanar with one side elevation of the end section; in the ground assembly state, the plane truss column is arranged against the bottom of the jig frame;
the plane truss column of the lower half part of the lattice column is formed by extending and converging an upper chord member and a lower chord member which are arranged on the same side of the end section, and the upper chord member and the lower chord member are connected through a diagonal web member.
Further, the middle part of the truss girder is downbent, the rods of the truss girder are steel pipes, and the outer diameter of the lower chord member is larger than that of the upper chord member.
Compared with the prior art, the large-span truss ceiling without the prestress component has the following beneficial effects:
according to the truss ceiling, the truss ceiling is formed by stacking ceiling units, then the supporting structures are arranged below the ceiling units at the highest position and the lowest position, deformation trends of two sides of joints between the ceiling units are opposite, deformation of different ceiling units cannot be accumulated, and therefore the rigidity of the whole truss ceiling is obviously improved, and large deformation is not easy to occur on the premise that a prestress component is not introduced;
according to the invention, the special-shaped truss like the bridge-shaped frame is divided into a plurality of sections, then the hanging points are arranged on the cross sections of the sections needing to turn over, the three hanging points are respectively arranged on the two upper chords and the one lower chord, the truss turning over can be completed by changing the sling lengths of the three hanging points during lifting, the requirement on the coordination of the crane is very low, and meanwhile, a traction rope is not needed; the lower ends of the lattice columns of the truss are folded to form a point, and when the truss turns over, the lower ends of the lattice columns are supported on the ground, so that the truss is supported and stabilized, and meanwhile, the posture change of the truss is not influenced;
according to the invention, the positions of the end face of the unit and the front door are adjusted, so that the inner space of the building is in a sector range taking the front door as the tip, when the truss ceiling is used as an exhibition hall, a person entering the door can see all exhibition areas in the whole exhibition hall at a glance, and the distribution of the exhibition areas in the exhibition hall can be rapidly mastered, thereby solving the problems of leakage, return path, no door finding and the like caused by the fact that the plane distribution of the exhibition hall is not known in the first observation and improving the observation experience.
Drawings
FIG. 1 is a schematic diagram of step one; the black points in the figure are column bottom embedded parts of lattice columns, the black solid columns in the figure are steel reinforced concrete columns, and the black solid columns belong to permanent support columns, wherein the upper ends of the permanent support columns are connected with bridge-shaped frames, and the lower ends of the permanent support columns are the same;
FIG. 2 is a schematic diagram of step two; the truss column in the figure is formed by stacking standard sections of a tower crane, belongs to temporary support columns, and needs to be dismantled after construction is completed, and is the same as the above;
FIG. 3 is a schematic diagram of step three;
FIG. 4 is a schematic diagram of step four;
FIG. 5 is a schematic diagram of step five;
FIG. 6 is a schematic illustration of a large span truss ceiling after construction;
FIG. 7 is a schematic structural view of a bridge; in order to facilitate the drawing, a section steel conversion section between the temporary support column and the bridge-shaped frame is omitted in the drawing;
FIG. 8 is a schematic diagram of the distribution of hanging points;
the device comprises a 1-ceiling unit, a 11-bridge-shaped frame, a 111-end section, a 112-middle section, a 113-lattice column, a 2-middle supporting frame, a 3-edge supporting column, a 4-filling column, a 5-wind-resistant supporting frame, a 6-temporary supporting column, a 7-moulding bed, 81-fixed hanging points, 82-prolonged hanging points and 83-shortened hanging points.
Detailed Description
As shown in fig. 6, a large span truss ceiling without prestressing members is used for a building requiring a continuous large space; the ceiling comprises a plurality of ceiling units 1 which are arranged side by side and are fixedly connected with each other, each ceiling unit 1 is formed by splicing a plurality of bridge-shaped frames 11 which are arranged side by side along the arrangement direction of the ceiling unit 1 and are fixedly connected with each other, each bridge-shaped frame 11 comprises a truss girder and lattice columns 113 which are propped under two ends of the truss girder, two side elevation surfaces of the positions of the lattice columns 113 in each ceiling unit 1 are marked as unit end surfaces, and the side elevation surfaces of the left side and the right side of the ceiling unit 1 are marked as unit side surfaces; thus, the ceiling units 1 are piled up one by one, the ceiling units 1 on two sides are the side walls of the building and are the bottommost layers, and the supporting structure is arranged at the position to support all the ceiling units 1, so that the supporting structure is conveniently arranged in the side walls, and the internal structure of the building is not influenced.
Of the ceiling units 1, the ceiling unit 1 having the highest height is referred to as the highest unit, and the remaining ceiling units 1 are made shorter stepwise from the highest unit to both sides; note that here adjacent ceiling units 1 are on both sides of the seam, the higher side needs to be always higher than the lower side, and the situation where local heights are reversed does not occur.
The support structures for supporting the entire truss roof are provided at one end of the bottom of the highest unit and at the bottoms of the outer edges of the two outermost roof units 1, respectively. The placement of the support structure at these locations does not interfere with the interior of the building.
The ceiling units 1 other than the highest unit are symmetrically distributed on the left and right sides of the highest unit. When the ceiling unit 1 is arranged in this way, the stress analysis is easier, and symmetrical sector-shaped exhibition areas are formed conveniently.
The truss ceiling is an exhibition hall, the front door of the exhibition hall is arranged on one unit end face of the highest unit, the end faces, close to the front door of the exhibition hall, of the two unit end faces of each ceiling unit 1 are marked as near-door end faces, and each near-door end face is gradually retracted from the front door of the exhibition hall to two sides of the exhibition hall. Thus, the space inside the building is located in a fan-shaped range, the front door is located at the tip of the fan-shaped, and the visual field of people entering the door can just cover the whole space inside the building.
The bearing structure of highest unit bottom is middle support frame 2, and middle support frame 2 includes a row of support columns that set up along ceiling unit 1 put direction interval, and each support column is as an organic whole through even roof beam, and middle support frame 2 sets up in the position that is close to the front door of exhibition hall, and leaves the space that is used as the hall between middle support frame 2 and the front door. The support column just has divided into a plurality of little passageways with the passageway after getting into like this, conveniently sets up the security check mechanism.
The top of the bridge 11 gradually becomes lower from the door-proximal end face toward the other end, and the lattice column 113 at the door-proximal end face position is bent inward. Thus, the water is conveniently discharged, and meanwhile, the discharged water runs away from the front door, and the lattice column 113 at the end face of the inlet door also has a certain rain shielding effect.
Each ceiling unit 1 except the highest unit is respectively marked as a left 1 unit, a left 2 unit, a left 3 unit … … left N unit, a right 1 unit, a right 2 unit, a right 3 unit … … right N unit from the highest unit, the middle part of the lower part of the ceiling unit 1 with the serial number of the odd number is provided with an anti-wind support frame 5, the anti-wind support frame 5 comprises two support columns which are arranged at intervals along the extending direction of the bridge-shaped frame 11, and the two support columns are connected into a whole through a connecting beam to form a door-type rigid frame.
The provision of the wind resistant support 5 here increases the safety margin and wind resistance of the building, noting that the wind resistant support 5 here is different from a portal rigid frame in a portal rigid frame light house, where the portal rigid frame is not the main load bearing member. Taking the international convention center as an example, the ceiling unit 1 with the smallest span also has the span of more than 40 meters and the width of more than 20 meters, if the load is borne by the portal rigid frames, at least one portal rigid frame is arranged below each bridge-shaped frame 11, and the whole building is internally provided with dense hemp columns, so that the ceiling unit can only be used as a factory building and cannot be used as an exhibition hall. Therefore, only two wind-resistant supports 5 are provided for the 5 roof units 1, which are prevented from influencing the interior display area distribution. It should be noted, however, that since the maximum height of the roof unit 1 is 8 meters, the bottom of the support column in the wind-resistant support 5 needs to be a rigid column foot to resist bending moment and exert wind-resistant effect.
Adjacent ceiling units 1 are fixedly connected through embedded rod pieces, and adjacent bridge-shaped frames 11 in the same ceiling unit 1 are fixedly connected through embedded rod pieces. Note that the stiffness of the embedded bars in the same ceiling unit 1 is high enough to ensure that the ceiling unit 1 is an integral body; the embedded and repaired rod pieces and surrounding rod pieces need to be combined into a new box truss girder, the stress direction of the embedded and repaired rod pieces between adjacent ceiling units 1 is single, the embedded and repaired rod pieces between the highest unit and the rest ceiling units 1 transmit tensile force, the rigidity is not required, and even the embedded and repaired rod pieces can be hinged. The embedded and repaired rod pieces among the ceiling units 1 except the highest unit mainly transmit pressure, so that the embedded and repaired rod pieces are mainly vertical embedded and repaired rod pieces, and two ends of the embedded and repaired rod pieces are rigid connection nodes.
The upper ends of the permanent support columns are propped against the crossing node positions of the rods of the lower chord members of the truss.
The support structures at the bottoms of the outer edges of the two outermost ceiling units 1 are edge support columns 3, and the edge support columns 3 are arranged at intervals along the extending direction of the bridge-shaped frame 11. Lattice columns 113 at the end face positions of the units are connected into a whole to form a wall body; meanwhile, a floor slab is arranged above the ceiling, and decorative walls are arranged at joints of the ceiling unit 1 and along the supporting columns 3 so as to seal the building.
As shown in fig. 7, the truss girder in the bridge 11 is a box girder having a rectangular cross section, the elevation of each upper chord of the truss girder is the same, and the elevation of each lower chord of the truss girder is the same; the two ends of the truss girder are downwards bent to form a lattice column 113, and the lower end of the lattice column 113 is contracted to a point; the truss girder is formed by welding and splicing a plurality of truss sections end to end, wherein each truss section comprises two end sections 111 positioned at two ends of the bridge-shaped frame 11 and a plurality of middle sections positioned between the end sections 111;
the middle section does not need to turn over, and the middle section can be directly lifted after the assembly is completed.
In the ground assembled state, the end section 111 and the lattice column 113 are assembled into an integral component, the end section 111 is arranged on the jig frame 7 in a state that the side elevation is close to the bottom of the jig frame 7, three hanging points are respectively arranged on at least two cross sections of the end section 111, the three hanging points on the same cross section are respectively arranged on two upper chords and the lower chord at the highest position, and lifting lugs can be welded on the hanging points in advance or not. Note however that the location of the suspension point is necessarily the intersection of the chord of the truss with the web members.
As shown in fig. 8, the hanging point on the bottom chord is denoted as an extended hanging point 82, the hanging point on the top chord at the highest is denoted as a fixed hanging point 81, and the hanging point on the top chord at the lowest is denoted as a shortened hanging point 83. When in hoisting, the three hoisting points are respectively connected with a chain block, the end section 111 is separated from the jig frame 7 by fixing the hoisting point 81 and prolonging the chain block on the hoisting point 82, and the lower end of the lattice column 113 is propped against the ground; after the end section 111 is separated from the jig frame 7, the chain on the extension lifting point 82 is gradually extended, and the chain on the shortening lifting point 83 is gradually shortened, so that the elevation of the two upper chords of the end section 111 is the same, and the truss turning-over is completed.
In the ground assembled state, the end segments 111 are arranged on the jig frame 7 in a position in which the side elevation rests against the bottom of the jig frame 7, i.e. the end segments 111 need to be laid flat during assembly.
The bottoms of the latticed columns 113 are provided with gaps for installing temporary supporting columns 6 or permanent filling columns 4, and the bottoms of the latticed columns 113 of the two outermost ceiling units 1 are provided with filling columns 4 for reinforcing the bearing capacity of the latticed columns 113; the two outermost ceiling units 1 are at the bottommost layer, and the pressure born by the lattice columns 113 is much stronger than that of the other layers, but the lower ends of the lattice columns 113 in the application are points, so that the strength is insufficient, the filling columns 4 are required to be arranged for reinforcement, and the filling columns 4 also play the effect of the temporary supporting columns 6 during hoisting.
The lattice column 113 includes a box-type truss column in the upper half and a plane truss column in the lower half, which is coplanar with one side elevation of the end section 111; in the ground assembled state, the plane truss column is arranged against the bottom of the jig frame 7; the planar truss column of the lower half of the lattice column 113 is formed by extending and converging an upper chord member and a lower chord member on the same side of the end section 111, and the upper chord member and the lower chord member are connected by a diagonal web member. This ensures smooth transition and integral formation of the lattice columns 113 with other parts while leaving a space for installing the temporary support columns 6, thereby ensuring an aesthetic effect.
The middle of the truss girder is downwards bent, the rods of the truss girder are all steel pipes, and the outer diameter of the lower chord is larger than that of the upper chord, so that the lower chord is stressed more, and the lower chord is required to be sized more to adapt to the characteristic.
The construction method of the large-span truss ceiling without the prestress component comprises the following steps:
as shown in fig. 1, step one: a column bottom embedded part for installing the lattice column 113, and a support structure for the bottom of the highest unit and the bottoms of the two outermost ceiling units 1;
as shown in fig. 2, step two: the highest unit is marked as a second construction flow section, all ceiling units 1 on one side of the highest unit are marked as a first construction flow section, all ceiling units 1 on the other side are marked as a third construction flow section, and the direction from the first construction flow section to the third construction flow section is marked as a construction flow direction;
temporary support columns 6 for temporarily supporting the bridge-like frames 11 in the first construction water section are built, and jig frames 7 for assembling the bridge-like frames 11 on the ground are built near both ends of the first ceiling unit 1;
as shown in fig. 3, step three: assembling bridge-shaped frames 11 on the jig frame 7, sequentially hanging the assembled bridge-shaped frames 11 on a temporary support frame along the construction flow direction, connecting each bridge-shaped frame 11 in the first construction flow section by using an embedded rod piece, and then completing the unloading of the first construction flow section;
as shown in fig. 4, step four: transferring the jig frame 7 to the vicinity of two ends of the second construction running water section, building temporary support columns 6 for temporarily supporting bridge-shaped frames 11 in the second construction running water section, building the second construction running water section according to the construction method in the third step, completing unloading of the second construction running water section, and connecting the first construction running water section with the second construction running water section by using embedded rod pieces;
as shown in fig. 5, step five: transferring the jig frame 7 to the vicinity of two ends of the third construction running water section, building temporary support columns 6 for temporarily supporting the bridge-shaped frames 11 in the third construction running water section, building the third construction running water section according to the construction method in the third step, completing unloading of the third construction running water section, and connecting the second construction running water section with the third construction running water section by using embedded rod pieces.
Step three, unloading each ceiling unit 1 one by one in the order opposite to the construction flow direction; in the fifth step, unloading of each ceiling unit 1 is completed one by one in the construction flow direction. That is, during unloading, each ceiling unit 1 is depressed step by step, gradually transmitting the load entirely to the edge support columns 3
In the third, fourth and fifth steps, unloading and grading are carried out, and the method specifically comprises the following steps:
in the third step, 10% of total deflection of each ceiling unit 1 is unloaded one by one along the sequence opposite to the construction flow direction, 20% of total deflection of each ceiling unit 1 is unloaded one by one if no abnormal deformation occurs to the truss, 30% of total deflection of each ceiling unit 1 is unloaded one by one if no abnormal deformation occurs to the truss, and 40% of total deflection of each ceiling unit 1 is unloaded one by one if no abnormal deformation occurs to the truss; abnormal deformation including yield, cracking, running and other abnormal conditions
In the fourth step, the highest unit is unloaded by 10% of the total deflection, if the truss does not have abnormal deformation, the highest unit is unloaded by 20% of the total deflection, if the truss does not have abnormal deformation, the highest unit is unloaded by 30% of the total deflection, and if the truss does not have abnormal deformation, the highest unit is unloaded by 40% of the total deflection;
in the fifth step, 10% of total deflection of each ceiling unit 1 is unloaded one by one along the construction running water direction, 20% of total deflection of each ceiling unit 1 is unloaded one by one if no abnormal deformation occurs in the truss, 30% of total deflection of each ceiling unit 1 is unloaded one by one if no abnormal deformation occurs in the truss, and 40% of total deflection of each ceiling unit 1 is unloaded one by one if no abnormal deformation occurs in the truss.
Because in this application, the stress distribution in the building when there is temporary support column 6 is very big with the stress distribution difference in the building when there is no temporary support column 6, is far more than conventional truss building, consequently need have very big pre-arching volume, and the truss degree of down warping is consequently bigger when unloading also, if once uninstallation is in place, will probably cause local yielding even fracture, consequently select here to use the stage uninstallation, and each stage uninstallation range is all greater than last level simultaneously to adapt to the law of steel deformation.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (9)
1. A large span truss ceiling without prestressing members for buildings requiring a continuous large space; the method is characterized in that: the ceiling system comprises a plurality of ceiling units (1) which are arranged side by side and are fixedly connected with each other, each ceiling unit (1) is formed by splicing a plurality of bridge-shaped frames (11) which are arranged side by side along the arrangement direction of the ceiling unit (1) and are fixedly connected with each other, each bridge-shaped frame (11) comprises a truss girder and lattice columns (113) which are propped under two ends of the truss girder, two side elevation surfaces of the lattice columns (113) in each ceiling unit (1) are marked as unit end surfaces, and side elevation surfaces on the left side and the right side of the ceiling unit (1) are marked as unit side surfaces;
of the ceiling units (1), the ceiling unit (1) having the highest height is designated as the highest unit, and the remaining ceiling units (1) are gradually reduced from the highest unit to both sides; the bottom of the outer side edge of the two outermost ceiling units (1) and one end of the bottom of the highest unit are respectively provided with a supporting structure for supporting the whole truss ceiling;
the support structure at the bottom of the highest unit is an intermediate support frame (2), the intermediate support frame (2) comprises a row of support columns which are arranged at intervals along the arrangement direction of the ceiling unit (1), the support columns are connected into a whole through a connecting beam, the intermediate support frame (2) is arranged at a position close to a front door of an exhibition hall, and a space serving as a hall is reserved between the intermediate support frame (2) and the front door;
the support structures at the bottoms of the outer edges of the two outermost ceiling units (1) are edge support columns (3), and the edge support columns (3) are arranged at intervals along the extending direction of the bridge-shaped frame (11).
2. A long span truss ceiling without prestressing members as defined in claim 1 wherein: the ceiling units (1) other than the highest unit are symmetrically distributed on the left side and the right side of the highest unit.
3. A long span truss ceiling without prestressing members as defined in claim 2 wherein: the truss ceiling is an exhibition hall, the front door of the exhibition hall is arranged on one unit end face of the highest unit, the end faces, close to the front door of the exhibition hall, of the two unit end faces of each ceiling unit (1) are marked as near-door end faces, and each near-door end face is gradually retracted from the front door of the exhibition hall to two sides of the exhibition hall.
4. A large span truss ceiling without prestressing members as defined in claim 3 wherein: the tops of the bridge frames (11) gradually decrease from the end face near the door to the other end, and the lattice columns (113) at the position near the end face near the door are bent inwards.
5. A long span truss ceiling without prestressing members as defined in claim 1 wherein: each ceiling unit (1) except the highest unit is respectively recorded as a left 1 unit, a left 2 unit, a left 3 unit … … left N unit, a right 1 unit, a right 2 unit, a right 3 unit … … right N unit from the highest unit, an anti-wind support frame (5) is arranged in the middle of the lower part of the ceiling unit (1) with the serial number of an odd number, the anti-wind support frame (5) comprises two support columns which are arranged at intervals along the extending direction of the bridge-shaped frame (11), and the two support columns are connected into a whole through a connecting beam to form a door-type rigid frame.
6. A long span truss ceiling without prestressing members as defined in claim 1 wherein: adjacent ceiling units (1) are fixedly connected through embedded rod pieces, adjacent bridge-shaped frames (11) in the same ceiling unit (1) are fixedly connected through embedded rod pieces, and lattice columns (113) at the end face positions of the units are connected into a whole to form a wall body.
7. A long span truss ceiling without prestressing members as defined in claim 1 wherein: the truss girders in the bridge-shaped frame (11) are box-shaped trusses with rectangular cross sections, the elevation of each upper chord of the truss girders is the same, and the elevation of each lower chord of the truss girders is the same; two ends of the truss girder are downwards bent to form lattice columns (113), and the lower ends of the lattice columns (113) are contracted to be one point; the truss girder is formed by welding and splicing a plurality of truss sections end to end, and the truss sections comprise two end sections (111) positioned at two ends of a bridge-shaped frame (11) and a plurality of middle sections positioned between the end sections (111);
in the ground assembly state, the end section (111) and the lattice column (113) are assembled into an integral component, the end section (111) is arranged on the jig frame (7) in a mode that a side elevation is attached to the bottom of the jig frame (7), three hanging points are respectively arranged on at least two cross sections of the end section (111), the three hanging points on the same cross section are respectively arranged on two upper chords and a lower chord member at the highest position, the hanging points on the lower chord member are marked as extension hanging points (82), the hanging points on the upper chord member at the highest position are marked as fixed hanging points (81), and the hanging points on the upper chord member at the lowest position are marked as shortening hanging points (83).
8. A large span truss ceiling without prestressing members as defined in claim 7 wherein: the bottoms of the latticed columns (113) are provided with gaps for installing temporary supporting columns (6) or permanent filling columns (4), and the bottoms of the latticed columns (113) of the two outermost ceiling units (1) are provided with the filling columns (4) for reinforcing the bearing capacity of the latticed columns (113);
the lattice column (113) comprises a box-type truss column in the upper half and a plane truss column in the lower half, wherein the plane truss column is coplanar with one side elevation of the end section (111); in the ground assembly state, the plane truss column is arranged close to the bottom of the jig frame (7);
the plane truss column of the lower half part of the lattice column (113) is formed by extending and converging an upper chord member and a lower chord member on the same side of the end section (111), and the upper chord member and the lower chord member are connected through inclined web members.
9. A large span truss ceiling without prestressing members as defined in claim 7 wherein: the middle part of the truss girder is downbent, the rods of the truss girder are steel pipes, and the outer diameter of the lower chord member is larger than that of the upper chord member.
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| CN115030317A (en) | 2022-09-09 |
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