CN109235771B - Large-span concave fish belly type combined light truss structure and mounting method thereof - Google Patents
Large-span concave fish belly type combined light truss structure and mounting method thereof Download PDFInfo
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- CN109235771B CN109235771B CN201811368317.5A CN201811368317A CN109235771B CN 109235771 B CN109235771 B CN 109235771B CN 201811368317 A CN201811368317 A CN 201811368317A CN 109235771 B CN109235771 B CN 109235771B
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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
- E04C3/11—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with non-parallel upper and lower edges, e.g. roof trusses
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
Abstract
The invention relates to a large-span concave fish-bellied combined light truss structure and an installation method thereof, wherein the large-span concave fish-bellied combined light truss structure is a special-shaped large-span truss and comprises positioning lattice columns, an arched main truss, a modeling secondary truss, overhanging main trusses and truss connecting rods arranged between trusses; the positioning lattice column is Guan Li column type, the lower chord is arch type main truss, a plurality of large-area roofs with thick two ends and light and thin middle can be formed by parallel connection, and the structure is more stable than the fish belly truss with big middle and small two ends; controlling the concave fish belly shape of the whole truss according to the sizes and the lengths of the triangular trusses at the two ends of the secondary truss and the single chord in the middle; the main trusses are shared among the trusses and the connecting rods are connected in a cross manner, so that the whole roof truss forms a whole with reasonable stress and attractive appearance. The fish-bellied truss structure is similar to the existing fish-bellied truss structure but has opposite modeling, and on the basis of sharing the main truss, the secondary trusses are connected in a cross manner through upper and lower chord connection tie bars, so that the main trusses and the secondary trusses form a complete whole.
Description
Technical Field
The invention relates to the technical field of large roof trusses, in particular to a large-span concave fish belly type combined light truss structure and an installation method thereof.
Background
With the continuous development of domestic economy, overpasses, corridors and large-scale exhibition halls are continuously emerging, and large-span roof truss layers with different shapes are endless; the choice of the structural form and the structural design directly determine the cost, rigidity and stability of the building structure, and also relate to the safety and comfort of pedestrians borne by the building structure. The former fish-bellied truss has single modeling, heavy truss middle part, and large steel consumption when forming a large-span roof truss, and is uneconomical.
Disclosure of Invention
In order to solve the technical problems, the invention provides a large-span concave fish-bellied combined light truss structure and an installation method thereof, the structure of the structure is similar to that of the existing fish-bellied truss structure, but the structure is opposite, and on the basis of sharing a main truss, secondary trusses are connected in a cross manner through upper and lower chords and tie bars, so that the main trusses and the secondary trusses form a complete whole.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a large-span concave fish belly type combined light truss structure is characterized in that:
the truss comprises positioning lattice columns, an arch-shaped main truss, a modeling secondary truss, overhanging main trusses and truss connecting rods arranged between the trusses;
the four positioning lattice columns are vertically arranged and are arranged in a rectangular shape;
the two arched main trusses are respectively and longitudinally arranged between the two positioning lattice columns, and the two ends of the arched main trusses are respectively welded and fixed with the positioning lattice columns;
the two modeling main trusses are transversely arranged between the two positioning lattice columns respectively, and the two end parts of the modeling main trusses are welded and fixed with the positioning lattice columns respectively;
the positioning lattice column, the arch-shaped main truss and the modeling main truss are enclosed to form a rectangular framework;
the cantilever main trusses are arranged on the outer sides of the positioning lattice columns and correspond to the end parts of the arch main trusses respectively, are coaxially arranged with the arch main trusses, and the inner side end parts of the cantilever main trusses are fixedly welded with the positioning lattice columns;
the modeling secondary trusses are transversely and uniformly arranged between the two modeling main trusses or the two overhanging main trusses at the outermost side, and the end parts of the modeling secondary trusses are welded and fixed with the arched main trusses or the overhanging main trusses respectively;
the truss connecting rod comprises an upper chord horizontal connecting rod, a lower chord horizontal connecting rod, a main chord conversion through rod, an end through length sealing rod, a through length conversion reinforcing rod and an overhanging reinforcing inclined rod, wherein the upper chord horizontal connecting rod and the lower chord horizontal connecting rod are used for connecting and reinforcing the modeling secondary truss, and the end through length sealing rod, the through length conversion reinforcing rod and the overhanging reinforcing inclined rod are used for reinforcing the overhanging main truss.
The upper chord and lower chord horizontal connecting rods are arranged between two adjacent modeling secondary trusses as a preselected technical scheme of the invention; the main chord conversion through rod is arranged in the center of the whole truss and is arranged longitudinally normally, and all the modeling secondary trusses are connected into a whole; the end through length sealing rod and the through length conversion reinforcing rod are arranged at the tail end of the cantilever main truss in parallel and are arranged in a transverse through length mode, and the two cantilever main trusses are connected into a whole and connected with a transverse adjacent combined truss structure; the cantilever reinforcing diagonal rods are arranged between the through length conversion reinforcing rods and the positioning lattice columns, and the middle of the cantilever reinforcing diagonal rods are fixedly connected with the modeling secondary trusses passing through.
Further, the positioning lattice column is formed by combining five steel pipes, is rectangular in whole and comprises a main upright column positioned in the middle and corner upright columns positioned at four corners; horizontal cross bars are respectively arranged between the main upright post and the corner upright post and between the adjacent corner upright posts at the top and bottom positions of the positioning lattice column; a horizontal patching rod is arranged between the main upright post and the corner upright post at the middle position of the positioning lattice column; and oblique patching rods are respectively arranged between the middle position of the main upright post and the top and bottom of the corner upright post for further reinforcement.
Further, the arch main truss is a double-row frame and comprises two upper chord straight rods and two arch lower chords which are arranged in parallel, a first straight web member and a first inclined web member are arranged between the upper chord straight rods and the arch lower chords on the same side, an upper chord horizontal connecting rod is arranged between the two upper chord straight rods, and a lower chord horizontal connecting rod is arranged between the two arch lower chords.
Further, the upper chord straight rod and the arched lower chord are formed by splicing a plurality of sections of short rods.
Furthermore, the modeling main truss is a double-row frame and comprises two upper chord combined rods which are arranged in parallel, the middle of each upper chord combined rod is low and two sides of each upper chord combined rod are high, the two upper chord combined rods are fixed through a horizontal connecting rod in a tie manner, and a horizontal reinforcing rod is arranged in the middle of each upper chord combined rod for reinforcing; four lower chords are arranged at the bottom of the upper chord combined rod, and a K-shaped frame is formed by the four lower chords and the two upper chord combined rods respectively; a second straight web member and a second inclined web member are arranged between the upper chord combined rod and the lower chord on the same side; the two lower chords arranged in parallel are fixed by a horizontal tie bar tie; and an inclined reinforcing rod is also arranged, one end of the inclined reinforcing rod is fixed on the upper chord combined rod, and the other end of the inclined reinforcing rod is fixed in the middle position of the horizontal connecting rod between the lower chords.
Furthermore, the cantilever main truss is a double-row frame and comprises two cantilever upper chords and two cantilever lower chords which are arranged in parallel, one ends of the two cantilever upper chords and the two cantilever lower chords are correspondingly fixed to form a tripod, and cantilever conversion supports are arranged at fixed positions; an overhanging straight web member and an overhanging inclined web member are arranged between the overhanging upper chords and the overhanging lower chords on the same side, an upper chord connecting tie rod is arranged between the two overhanging upper chords, and a lower chord connecting tie rod is arranged between the two overhanging lower chords; the overhanging upper chord member extends to one side of the overhanging conversion support to form an overhanging extension chord member.
Furthermore, the end through long sealing rod is transversely and vertically arranged at the tail end of the overhanging extension chord member, and the through long conversion reinforcing rod is transversely arranged at the overhanging conversion support position.
Further, the modeling secondary truss is a K-shaped single-piece truss and comprises an upper chord member and a combined lower chord member, wherein the middle of the upper chord member is broken into two sections for the main chord conversion through rod to pass through and be fixedly connected with the main chord conversion through rod; and a third straight web member and a third inclined web member are arranged between the upper chord member and the combined lower chord member.
In addition, the invention also discloses a method for installing the large-span concave fish belly type combined light truss structure, which is characterized by comprising the following steps of:
step one, preparing: preparing materials and measuring and positioning;
step two, installing a positioning lattice column: firstly, positioning an upper tire of a main upright post, sequentially assembling a horizontal patching rod and an oblique patching rod from bottom to top, welding the horizontal patching rod and the oblique patching rod with the main upright post, and sequentially symmetrically installing angle upright posts and sequentially symmetrically welding the horizontal patching rod and the oblique patching rod with the angle upright posts; finally, installing a horizontal cross rod and welding the horizontal cross rod with the corner upright post;
step three, installing a modeling main truss and welding with the positioning lattice column: firstly, assembling an upper chord combined rod, positioning an upper tire, assembling a second straight web member and a lower chord member in sequence, welding, assembling a second inclined web member, welding an upper chord combined rod and the lower chord member, assembling a horizontal reinforcing rod, horizontally connecting a tie rod in sequence, welding, assembling an inclined reinforcing rod, and welding;
step four, installing an arch-shaped main truss and welding with the positioning lattice column: firstly, positioning an upper tire of an arched lower chord member, sequentially positioning an upper tire of a first straight web member, positioning an upper tire of an upper chord straight rod, sequentially welding interfaces of the first straight web member, the arched lower chord member and the upper chord straight rod from the middle to two ends, assembling a first inclined web member, welding the first inclined web member, the arched lower chord member and the upper chord straight rod, assembling an upper chord horizontal connecting rod and a lower chord horizontal connecting rod, and welding;
step five, installing a cantilever main truss: firstly, splicing and positioning an upper tire by an overhanging upper chord member, splicing and welding an overhanging straight web member and an overhanging lower chord member in sequence, splicing and welding an overhanging inclined web member, and simultaneously welding the overhanging upper chord member and the overhanging lower chord member; finally, sequentially splicing and welding a lower chord connecting rod and an upper chord connecting rod, sequentially splicing and assembling a cantilever conversion support, a cantilever extension chord, simultaneously installing a through length sealing rod at the end part and a through length conversion reinforcing rod, and welding;
step six, simultaneously installing a modeling secondary truss and a main string conversion through rod: the main string conversion through rod is respectively welded with the modeling secondary truss, the modeling secondary truss and the arch main truss or the overhanging main truss; firstly, positioning an upper chord member upper tire and welding and fixing the upper chord member upper tire with a main chord transition through rod, then assembling and fixing a third straight web member upper tire, assembling a combined lower chord member upper tire, welding an upper chord member, a combined lower chord member and the third straight web member respectively, and finally assembling and welding a third inclined web member;
step seven, installing residual truss connecting rods: the method comprises the steps of installing upper and lower chord horizontal connecting rods between the modeling secondary trusses and installing overhanging reinforcing diagonal rods between an overhanging main truss and a positioning lattice column;
and step eight, overall quality inspection, namely finishing the large-span concave fish belly type combined light truss structure.
The truss structure is a special-shaped large-span truss, and a plurality of trusses can be connected in parallel to form a large-area roof with thick ends and light and thin middle, and the structure is complex and more stable than a fish-bellied truss with large middle and small ends; meanwhile, the concave fish belly shape of the whole truss is controlled according to the sizes and the lengths of the triangular trusses at the two ends of the secondary truss and the single chord in the middle; the main trusses are shared among the trusses and the connecting rods are connected in a cross manner, so that the whole roof truss forms a whole with reasonable stress and attractive appearance;
specifically, compared with the prior art, the invention ensures the stress state of the truss while ensuring the modeling through the following four main technologies:
1) The positioning lattice column is Guan Li column type, the middle main upright pole is connected with the four corner secondary upright poles and the secondary upright poles through the round tube horizontal pole and the patching pole to form a lattice column, so that the rigidity of the truss is ensured;
2) The lower chord is an arch-shaped main truss, and the lower chord is arch-shaped, so that the stress capability of the main truss is enhanced;
3) The secondary trusses are single-piece trusses, single chords are connected with the single-piece near-triangular trusses at the two ends, and each truss is used for controlling the modeling of the whole truss according to the sizes of the triangular trusses at the two ends of the secondary trusses and the single chords in the middle;
4) The main truss and the secondary truss are reasonably distributed to form an integral truss, and the strength is ensured.
Drawings
The foregoing and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the detailed description taken in conjunction with the following drawings, which are meant to be illustrative only and not limiting of the invention, wherein:
FIG. 1 is a schematic view of the overall structure of a large-span concave fish belly type combined light truss structure according to the present invention;
FIG. 2 is a schematic view of the structure of an arched main truss according to the present invention;
FIG. 3 is a schematic view of a spacer grid column according to the present invention;
FIG. 4 is a schematic structural view of a modeling main truss according to the present invention;
FIG. 5 is a schematic view of the structure of the overhanging main truss according to the invention;
fig. 6 is a schematic structural view of a modeling sub-truss according to the present invention.
Reference numerals: 1-truss connecting rod, 11-upper and lower chord horizontal connecting rod, 12-main chord conversion through rod, 13-end through long sealing rod, 14-through long conversion reinforcing rod, 15-overhanging reinforcing diagonal, 2-modeling secondary truss, 21-upper chord, 22-combined lower chord, 23-third straight web member, 24-third diagonal web member, 3-positioning lattice column, 31-main upright post, 32-angle upright post, horizontal transverse rod, 34-horizontal attaching rod, 35-oblique attaching rod, 4-arched main truss, 41-arched lower chord member, 42-upper chord straight rod, 43-first straight web member the novel bridge type bridge girder comprises a 44-upper chord horizontal connecting rod, a 45-lower chord horizontal connecting rod, a 46-first diagonal web member, a 5-modeling main truss, a 51-upper chord combined rod, a 52-lower chord member, a 53-horizontal reinforcing rod, a 54-horizontal connecting rod, a 55-second straight web member, a 56-diagonal reinforcing rod, a 57-second diagonal web member, a 6-overhanging main truss, a 61-overhanging upper chord member, a 62-overhanging lower chord member, a 63-lower chord connecting rod, a 64-upper chord connecting rod, a 65-overhanging straight web member, a 66-overhanging diagonal web member, a 67-overhanging conversion support and a 68-overhanging extension chord member.
Detailed Description
Hereinafter, an embodiment of a large-span concave fish belly type composite lightweight truss structure and a method of installing the same according to the present invention will be described with reference to the accompanying drawings.
The examples described herein are specific embodiments of the present invention, which are intended to illustrate the inventive concept, are intended to be illustrative and exemplary, and should not be construed as limiting the invention to the embodiments and scope of the invention. In addition to the embodiments described herein, those skilled in the art can adopt other obvious solutions based on the disclosure of the claims and specification of the present application, including those adopting any obvious substitutions and modifications to the embodiments described herein. The drawings in the present specification are schematic views, which assist in explaining the concept of the present invention, and schematically show the shapes of the respective parts and their interrelationships. Note that, in order to clearly show the structures of the components of the embodiments of the present invention, the drawings are not drawn to the same scale. Like reference numerals are used to denote like parts.
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention. Referring to fig. 1, a large-span concave fish belly type combined light truss structure is characterized in that: the device comprises four positioning lattice columns 3, four arched main trusses 4, four modeling main trusses 5, four modeling secondary trusses 2, overhanging main trusses 6 and truss connecting rods 1 arranged among the trusses, wherein the four positioning lattice columns 3 are vertically arranged and are arranged in a rectangular shape; the two arched main trusses 4 are respectively and longitudinally arranged between the two positioning lattice columns 3, and the two ends of each arched main truss are respectively welded and fixed with the positioning lattice columns 3; the number of the modeling main trusses 5 is two, the modeling main trusses are respectively and transversely arranged between the two positioning lattice columns 3, and the two end parts are respectively welded and fixed with the positioning lattice columns 3; the positioning lattice column 3, the arch-shaped main truss 4 and the modeling main truss 5 are enclosed to form a rectangular framework; the cantilever main trusses 6 are arranged at the outer sides of the positioning lattice columns 3 respectively corresponding to the end parts of the arched main trusses 4 and are coaxially arranged with the arched main trusses 4, and the inner side end parts of the cantilever main trusses are welded and fixed with the positioning lattice columns 3; the modeling secondary trusses 2 are transversely and uniformly arranged between the two modeling main trusses 5 or the two overhanging main trusses 6 at the outermost side, and the end parts of the modeling secondary trusses are respectively welded and fixed with the arched main trusses 4 or the overhanging main trusses 6; the truss connecting rod 1 comprises an upper chord horizontal connecting rod 11, a lower chord horizontal connecting rod 11, a main chord conversion through rod 12, an end through length sealing rod 13, a through length conversion reinforcing rod 14 and an overhanging reinforcing inclined rod 15, wherein the upper chord horizontal connecting rod and the lower chord horizontal connecting rod are used for connecting and reinforcing the modeling secondary truss 2, and the end through length sealing rod, the through length conversion reinforcing rod 14 and the overhanging reinforcing inclined rod are used for reinforcing the overhanging main truss 6.
Wherein, the upper and lower chord horizontal connecting rods 11 are arranged between two adjacent modeling secondary trusses 2; the main chord transition through rod 12 is arranged in the center of the whole truss and is arranged longitudinally normally to connect all the modeling sub-trusses 2 into a whole. The end through length sealing rod 13 and the through length conversion reinforcing rod 14 are arranged at the tail end of the cantilever main truss 6 in parallel and are arranged in a transverse through length mode, and the two cantilever main trusses 6 are connected into a whole and connected with a transverse adjacent combined truss structure; the cantilever reinforcing diagonal rods 15 are arranged between the through length conversion reinforcing rods 14 and the positioning lattice columns 3, and the middle of the cantilever reinforcing diagonal rods is fixedly connected with the passing modeling secondary truss 2.
As shown in fig. 2, the arch main truss 4 is a double-row frame, and comprises two upper chord straight rods 42 and two arch lower chords 41 which are arranged in parallel, a first straight web member 43 and a first diagonal web member 46 are arranged between the upper chord straight rods 42 and the arch lower chords 41 on the same side, an upper chord horizontal connecting rod 44 is arranged between the two upper chord straight rods 42, and a lower chord horizontal connecting rod 45 is arranged between the two arch lower chords 41. The upper chord straight rod 42 and the arched lower chord 41 are formed by splicing a plurality of short rods.
As shown in fig. 3, the positioning lattice column 3 is formed by combining five steel pipes, is rectangular in whole and comprises a main upright column 31 positioned in the middle and corner upright columns 32 positioned at four corners; horizontal cross bars 33 are respectively arranged between the main upright posts 31 and the corner upright posts 32 and between the adjacent corner upright posts 32 at the top and bottom positions of the positioning lattice posts 3; a horizontal patching rod 34 is arranged between the main upright 31 and the corner upright 32 at the middle position of the positioning lattice column 3; an oblique fixing rod 35 is further arranged between the middle position of the main upright 31 and the top and bottom of the corner upright 32 for further reinforcement.
As shown in fig. 4, the modeling main truss 5 is a double-row frame and comprises two upper chord combined rods 51 which are arranged in parallel, wherein the middle of each upper chord combined rod 51 is low and high, the two upper chord combined rods 51 are fixedly tied through a horizontal connecting rod 54, and a horizontal reinforcing rod 53 is arranged in the middle for reinforcing; four lower chords 52 are arranged at the bottom of the upper chord combined rod 51 and respectively form a K-shaped frame with the two upper chord combined rods 51; a second straight web member 55 and a second diagonal web member 57 are arranged between the same-side upper chord composite member 51 and the lower chord member 52; the two lower chords 52 arranged in parallel are fixedly tied through a horizontal tie rod 54; an inclined reinforcing rod 56 is further provided, one end of which is fixed to the upper chord member 51, and the other end of which is fixed to an intermediate position of the horizontal tie rod 54 between the lower chords 52.
As shown in fig. 5, the overhanging main truss 6 is a double-row frame, and comprises two overhanging upper chords 61 and two overhanging lower chords 62 which are arranged in parallel, one ends of the two overhanging upper chords and the two overhanging lower chords are correspondingly fixed to form a tripod, and overhanging conversion brackets 67 are arranged at fixed positions; an overhanging straight web member 65 and an overhanging inclined web member 66 are arranged between the overhanging upper chord member 61 and the overhanging lower chord member 62 on the same side, an upper chord connecting rod 64 is arranged between the two overhanging upper chord members 61, and a lower chord connecting rod 63 is arranged between the two overhanging lower chord members 62; the overhanging upper chord member 61 extends to one side of the overhanging conversion bracket 67 to form an overhanging extension chord member 68. The end through length sealing rod 13 is transversely and vertically arranged at the tail end of the cantilever extension chord 68, and the through length conversion reinforcing rod 14 is transversely arranged at the cantilever conversion support 67.
As shown in fig. 6, the modeling secondary truss 2 is a K-shaped single-piece truss, and comprises an upper chord member 21 and a combined lower chord member 22, wherein the middle of the upper chord member 21 is broken into two sections for the main chord conversion through rod 12 to pass through and be fixedly connected with; a third straight web member 23 and a third diagonal web member 24 are provided between the upper chord member 21 and the combined lower chord member 22.
The installation method of the large-span concave fish belly type combined light truss structure comprises the following steps of:
step one, preparing: preparing materials and measuring and positioning;
step two, installing a positioning lattice column 3:
(1) Positioning the upper tire of the main upright column 31;
(2) The horizontal attaching rod 34 and the inclined attaching rod 35 are assembled in sequence from bottom to top and welded with the main upright 31;
(3) The corner upright posts 32 are symmetrically arranged in sequence and are symmetrically welded with the horizontal patching rods 34 and the oblique patching rods 35 in sequence;
(4) Mounting a horizontal cross bar 33 and welding with the corner posts 32;
step three, installing a modeling main truss 5 and welding with the positioning lattice column 3:
(1) The upper chord combined rod 51 is assembled with an upper tire and positioned;
(2) Sequentially assembling and welding the second straight web member 55 and the lower chord member 52;
(3) Assembling and welding the second diagonal web member 57, and simultaneously welding the upper chord composite member 51 and the lower chord member 52;
(4) Assembling and welding a horizontal reinforcing rod 53 and a horizontal connecting rod 54 in sequence;
(5) Assembling and welding the oblique reinforcing rods 56;
step four, installing an arch-shaped main truss 4 and welding with the positioning lattice column 3:
(1) Positioning an upper tire of the arched lower chord 41;
(2) The first straight web members 43 are positioned on the tire in sequence;
(3) The upper chord straight rod 42 is positioned with the upper tire and is welded with the first web member 43 and the arched lower chord member 41 from the middle to the two ends in sequence and is connected with the upper chord straight rod 42;
(4) Assembling the first diagonal web member 46 and welding with the arched lower chord 41 and the upper chord straight rod 42;
(5) Assembling and welding an upper chord connecting rod 44 and a lower chord connecting rod 45;
step five, simultaneously installing a modeling secondary truss 2 and a main chord conversion through rod 12, and respectively welding the main chord conversion through rod 12 with the modeling secondary truss 2 and the modeling secondary truss 2 with an arch-shaped main truss 4;
(1) Positioning an upper chord 21 upper tire and welding and fixing the upper chord with the main chord change-over through rod 12;
(2) The upper tire of the third straight web member 23 is assembled and fixed;
(3) The upper tire of the combined lower chord member 22 is assembled, wherein the upper chord member 21, the combined lower chord member 22 and the third straight web member 23 are respectively welded;
(4) The third diagonal web member 24 is assembled and welded;
step six, installing a cantilever main truss 6:
(1) Splicing and positioning the upper tire by the overhanging upper chord member 61;
(2) Sequentially assembling and welding the overhanging straight web member 65 and the overhanging lower chord member 62;
(3) Assembling and welding the overhanging diagonal web member 66, and simultaneously welding the overhanging upper chord member 61 and the overhanging lower chord member 62;
(4) Sequentially splicing and welding a lower chord connecting rod 63 and an upper chord connecting rod 64;
(5) Assembling the cantilever conversion support 67 and the cantilever extension chord 68 in sequence, simultaneously installing the through length sealing rod 13 and the through length conversion reinforcing rod 14 at the end parts, and welding;
step seven, installing the residual truss connecting rod 1: the method comprises the steps of installing an upper chord horizontal connecting rod 11 and a lower chord horizontal connecting rod between the modeling secondary trusses 2, and installing an overhanging reinforcing diagonal rod 15 between an overhanging main truss 6 and a positioning lattice column 3;
and step eight, overall quality inspection, namely a large-span concave fish belly type combined light truss structure.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (8)
1. A large-span concave fish belly type combined light truss structure is characterized in that:
the device comprises a positioning lattice column (3), an arch-shaped main truss (4), a modeling main truss (5), a modeling secondary truss (2), a cantilever main truss (6) and truss connecting rods (1) arranged between the trusses;
four positioning lattice columns (3) are vertically arranged and are arranged in a rectangular shape;
the two arched main trusses (4) are longitudinally arranged between the two positioning lattice columns (3) respectively, and the two end parts of the arched main trusses are welded and fixed with the positioning lattice columns (3) respectively;
the number of the modeling main trusses (5) is two, the modeling main trusses are respectively and transversely arranged between the two positioning lattice columns (3), and the two end parts are respectively welded and fixed with the positioning lattice columns (3);
the positioning lattice column (3), the arch-shaped main truss (4) and the modeling main truss (5) are enclosed to form a rectangular framework;
the cantilever main trusses (6) are arranged at the outer sides of the positioning lattice columns (3) and are coaxially arranged with the arched main trusses (4), and the inner side ends of the cantilever main trusses are welded and fixed with the positioning lattice columns (3);
the modeling secondary trusses (2) are transversely and uniformly arranged between the two modeling main trusses (5) or the two overhanging main trusses (6) at the outermost side, and the end parts of the modeling secondary trusses are respectively welded and fixed with the arched main trusses (4) or the overhanging main trusses (6);
the truss connecting rod (1) comprises an upper chord horizontal connecting rod (11) and a lower chord horizontal connecting rod (12) which are used for connecting and reinforcing the modeling secondary truss (2), and a main chord conversion through rod (12), and an end part through length sealing rod (13), a through length conversion reinforcing rod (14) and an overhanging reinforcing inclined rod (15) which are used for reinforcing the overhanging main truss (6);
the upper chord and lower chord horizontal connecting rods (11) are arranged between two adjacent modeling secondary trusses (2); the main chord conversion through rod (12) is arranged in the center of the whole truss, longitudinally penetrates through the whole truss, and connects all the modeling secondary trusses (2) into a whole; the end through length sealing rod (13) and the through length conversion reinforcing rod (14) are arranged at the tail end of the cantilever main truss (6) in parallel and are arranged in a transverse through length mode, and the cantilever main truss (6) is connected into a whole and connected with a transverse adjacent combined truss structure; the cantilever reinforcing diagonal rods (15) are arranged between the through length conversion reinforcing rods (14) and the positioning lattice columns (3), and the middle of the cantilever reinforcing diagonal rods is fixedly connected with the passing modeling secondary truss (2);
the positioning lattice column (3) is formed by combining five steel pipes, is rectangular in whole and comprises a main upright column (31) positioned in the middle and corner upright columns (32) positioned at four corners; horizontal cross bars (33) are respectively arranged between the main upright posts (31) and the corner upright posts (32) and between adjacent corner upright posts (32) at the top and bottom positions of the positioning lattice posts (3); a horizontal decorating rod (34) is arranged between the main upright post (31) and the corner upright post (32) at the middle position of the positioning lattice post (3); and oblique decoration rods (35) are respectively arranged between the middle position of the main upright post (31) and the top and the bottom of the corner upright post (32) for further reinforcement.
2. A large span concave fish belly type composite light truss structure according to claim 1 wherein: the arch-shaped main truss (4) is a double-row frame and comprises two upper chord straight rods (42) and two arch-shaped lower chords (41) which are arranged in parallel, a first straight web member (43) and a first diagonal web member (46) are arranged between the upper chord straight rods (42) and the arch-shaped lower chords (41) on the same side, an upper chord horizontal connecting rod (44) is arranged between the two upper chord straight rods (42), and a lower chord horizontal connecting rod (45) is arranged between the two arch-shaped lower chords (41).
3. A large span concave fish belly type composite light truss structure according to claim 2 wherein: the upper chord straight rod (42) and the arched lower chord (41) are formed by splicing a plurality of sections of short rods.
4. A large span concave fish belly type composite light truss structure according to claim 1 wherein: the modeling main truss (5) is a double-row frame and comprises two upper chord combined rods (51) which are arranged in parallel, the middle of each upper chord combined rod (51) is low, the two upper chord combined rods (51) are high on two sides, the two upper chord combined rods (51) are fixedly tied through a horizontal connecting rod (54), and a horizontal reinforcing rod (53) is arranged in the middle for reinforcing; four lower chords (52) are arranged at the bottom of the upper chord combined rod (51), and a K-shaped frame is formed by the four lower chords and the two upper chord combined rods (51); a second straight web member (55) and a second inclined web member (57) are arranged between the upper chord combined rod (51) and the lower chord (52) on the same side; the two lower chords (52) arranged in parallel are fixed by a horizontal tie rod (54) in a tie manner; an inclined reinforcing rod (56) is also arranged, one end of the inclined reinforcing rod is fixed on the upper chord combined rod (51), and the other end of the inclined reinforcing rod is fixed at the middle position of a horizontal connecting rod (54) between the lower chords (52).
5. A large span concave fish belly type composite light truss structure according to claim 1 wherein: the cantilever main truss (6) is a double-row frame and comprises two cantilever upper chords (61) and two cantilever lower chords (62) which are arranged in parallel, one ends of the two cantilever upper chords and the two cantilever lower chords are correspondingly fixed to form a tripod, and cantilever conversion supports (67) are arranged at fixed positions; an overhanging straight web member (65) and an overhanging inclined web member (66) are arranged between the overhanging upper chord member (61) and the overhanging lower chord member (62) on the same side, an upper chord connecting rod (64) is arranged between the two overhanging upper chord members (61), and a lower chord connecting rod (63) is arranged between the two overhanging lower chord members (62); the overhanging upper chord member (61) extends to one side of the overhanging conversion support (67) to form an overhanging extension chord member (68).
6. A large span concave fish belly type composite light truss structure according to claim 5 wherein: the end through length sealing rod (13) is transversely and vertically arranged at the tail end of the overhanging extension chord member (68), and the through length conversion reinforcing rod (14) is transversely arranged at the overhanging conversion support (67).
7. A large span concave fish belly type composite light truss structure according to claim 1 wherein: the modeling secondary truss (2) is a K-shaped single-piece truss and comprises an upper chord member (21) and a combined lower chord member (22), wherein the middle of the upper chord member (21) is broken into two sections for the main chord conversion through rod (12) to pass through and be fixedly connected with; a third straight web member (23) and a third inclined web member (24) are arranged between the upper chord member (21) and the combined lower chord member (22).
8. A method of installing a large span concave fish belly type composite light truss structure as defined in any one of claims 1 to 7 comprising the steps of:
step one, preparing: preparing materials and measuring and positioning;
step two, installing a positioning lattice column (3): firstly, positioning an upper tire of a main upright post (31), sequentially assembling a horizontal decoration rod (34) and an oblique decoration rod (35) from bottom to top, welding the horizontal decoration rod and the oblique decoration rod with the main upright post (31), and sequentially symmetrically installing an angle upright post (32) and sequentially symmetrically welding the horizontal decoration rod (34) and the oblique decoration rod (35); finally, a horizontal cross rod (33) is installed and welded with the corner upright post (32);
step three, installing a modeling main truss (5) and welding with the positioning lattice column (3): firstly, splicing an upper chord combined rod (51) into an upper tire and positioning, splicing a second straight web member (55) and a lower chord member (52) in sequence and welding, splicing a second inclined web member (57) and welding, simultaneously welding the upper chord combined rod (51) and the lower chord member (52), splicing a horizontal reinforcing rod (53) and a horizontal connecting rod (54) in sequence and welding, splicing an inclined reinforcing rod (56) and welding;
step four, installing an arch-shaped main truss (4) and welding with the positioning lattice column (3): firstly, positioning an upper tire of an arched lower chord member (41), sequentially positioning an upper tire of a first straight web member (43), then positioning an upper tire of an upper chord straight rod (42), sequentially welding interfaces of the first straight web member (43) with the arched lower chord member (41) and the upper chord straight rod (42) from the middle to the two ends, assembling a first inclined web member (46), welding the first inclined web member with the arched lower chord member (41) and the upper chord straight rod (42), and assembling and welding an upper chord horizontal connecting rod (44) and a lower chord horizontal connecting rod (45);
step five, installing a cantilever main truss (6): firstly, splicing and positioning an upper tire by an overhanging upper chord member (61), splicing and welding an overhanging straight web member (65) and an overhanging lower chord member (62) in sequence, splicing and welding an overhanging inclined web member (66), and simultaneously welding the overhanging upper chord member (61) and the overhanging lower chord member (62); finally, sequentially splicing and welding a lower chord connecting rod (63) and an upper chord connecting rod (64), sequentially splicing and assembling a cantilever conversion support (67) and a cantilever extension chord (68), simultaneously installing a through length sealing rod (13) at the end part and a through length conversion reinforcing rod (14) at the same time, and welding;
step six, simultaneously installing the modeling secondary truss (2) and the main string conversion through rod (12): the main chord conversion through rod (12) is respectively welded with the modeling secondary truss (2), the modeling secondary truss (2) is respectively welded with the arch main truss (4) or the overhanging main truss (6); firstly, positioning an upper tire of an upper chord member (21) and welding and fixing the upper tire with a main chord transition through rod (12), then splicing and fixing an upper tire of a third straight web member (23), splicing an upper tire of a combined lower chord member (22), respectively welding the upper chord member (21), the combined lower chord member (22) and the third straight web member (23), and finally splicing and welding a third inclined web member (24);
step seven, installing a residual truss connecting rod (1): comprises an upper chord horizontal connecting rod (11) and a lower chord horizontal connecting rod (11) are arranged between a modeling secondary truss (2), and an overhanging reinforcing diagonal rod (15) is arranged between an overhanging main truss (6) and a positioning lattice column (3);
and step eight, overall quality inspection, namely finishing the large-span concave fish belly type combined light truss structure.
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| CN112982793B (en) * | 2021-02-08 | 2023-01-10 | 清华大学建筑设计研究院有限公司 | Super-large span heavy-load prestressed space truss based on topological optimization principle |
| CN114059669B (en) * | 2021-09-16 | 2023-01-31 | 北京市机械施工集团有限公司 | Self-rotating accumulated lifting method for large-span annular double-layer pipe truss |
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| JP3046124B2 (en) * | 1992-01-06 | 2000-05-29 | 飛島建設株式会社 | Truss manufacturing method and dome construction method using truss |
| JP3805456B2 (en) * | 1997-01-14 | 2006-08-02 | 清水建設株式会社 | Arch structure and roof |
| US6553736B2 (en) * | 2000-12-26 | 2003-04-29 | Antonio Montanaro | Interlocking truss system |
| CN101200959B (en) * | 2007-11-29 | 2010-06-16 | 北京城建集团有限责任公司 | Multi-point pushing cumulative-gliding construction method for steel roof truss |
| CN102635209B (en) * | 2012-05-23 | 2014-10-08 | 中建二局第三建筑工程有限公司 | Cornice steel skeleton and bracket steel skeleton for large-span big roof of pseudo-classic architecture and construction method of cornice steel skeleton and bracket steel skeleton |
| CN203296051U (en) * | 2013-04-15 | 2013-11-20 | 上海市政工程设计研究总院（集团）有限公司 | Prestress fish belly sill supporting strut end |
| CN108316479B (en) * | 2018-04-16 | 2023-10-27 | 中建二局第三建筑工程有限公司 | Truss arch system and construction method thereof |
| CN209163212U (en) * | 2018-11-16 | 2019-07-26 | 中建二局安装工程有限公司 | A kind of recessed fish-bellied type combination light truss structure of large span |
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