CN108240069B - Large-span multi-section combined truss roof structure system and construction method thereof - Google Patents
Large-span multi-section combined truss roof structure system and construction method thereof Download PDFInfo
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- CN108240069B CN108240069B CN201810243007.4A CN201810243007A CN108240069B CN 108240069 B CN108240069 B CN 108240069B CN 201810243007 A CN201810243007 A CN 201810243007A CN 108240069 B CN108240069 B CN 108240069B
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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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Abstract
The large-span multi-section combined truss roof structure system comprises a structural column and a roof truss, wherein the structural column is divided into a middle column and a side column, the roof truss comprises a main truss and a secondary truss, the main truss comprises a side main truss and a middle main truss, the main truss is formed by splicing main truss units, the two end faces of the main truss units are oblique end faces, and the two oblique end faces are parallel. The node areas of the structural columns are provided with column connecting brackets which are used for connecting the roof trusses and are matched with members of the corresponding roof trusses. In the construction method, the roof truss and the column structure are mounted in a segmented mode by matching with temporary reinforcing measures. The invention aims at improving a structural system under the condition of meeting construction stress, optimizing construction procedures, saving construction cost, improving installation efficiency and saving measure cost.
Description
Technical Field
The invention relates to a roof structure system, in particular to a multi-section combined roof structure system and a construction method thereof.
Background
During construction operation of the large-span truss, the connecting mode is various and the stress is complex due to common high-altitude operation, and the lifting method, the stability and the integral rigidity of the truss are comprehensively considered to ensure that the truss construction accords with the design stress state, so that the truss structure mode has quite high requirements. The existing large-span truss is generally assembled by adopting a pipe truss or an H-shaped steel truss, and the two existing trusses cannot well combine performance optimization and structural optimization, so that the problems of insufficient rigidity, unstable stressed structure and overlarge steel consumption exist.
Meanwhile, the pipe truss roof structure system and the H-shaped steel girder roof structure system are directly connected without any positioning connection point in the existing connection mode, and the positioning installation truss which cannot be effectively and quickly connected by the connection node easily causes position deviation. Meanwhile, the prior construction method has large measure usage amount, and the connection rigidity of the nodes cannot be ensured.
Disclosure of Invention
The invention aims to provide a large-span multi-section combined truss roof structure system and a construction method thereof, which are used for solving the technical problems that the rigidity of the existing H-shaped steel truss or pipe truss is insufficient, the stressed structure is unstable and the steel consumption is overlarge, and solving the technical problems that in the existing pipe truss or H-shaped steel roof structure system, the connecting position is deviated due to the fact that no positioning connecting point exists in the direct butt joint of nodes, and the rigidity of the connecting node cannot be ensured due to inaccurate installation position.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a large-span multi-section combined truss roof structure system comprises structural columns and roof trusses connected with the structural columns,
the structural columns are connected with two longitudinal end parts of the roof truss and are divided into a middle column and a side column which are close to each other according to the midspan distance between the structural columns and the roof truss,
the roof truss comprises a longitudinal main truss and a transverse secondary truss,
the main trusses are arranged in parallel at intervals and comprise side main trusses at two sides and a middle main truss in the middle,
the side main truss is divided into three sections by structural columns, is fixedly connected between longitudinal columns of the structural columns, is respectively provided with two side sections and one side middle section, is connected between middle columns, is provided with side middle sections, is connected between the middle columns and the side columns,
the middle main truss is also divided into two middle side sections and a middle section according to the position of the side main truss, the middle main truss is fixedly connected with the side main truss or the structural column through the secondary truss,
the main truss is in a lath shape as a whole, the cross section of the main truss is I-shaped, the main truss comprises an upper flange plate, a first web plate, a first lower flange pipe and a first stiffening plate, the upper flange plate and the first lower flange pipe are arranged in parallel,
the first web is vertical to the upper flange plate, the top end surface of the first web is welded with the lower side surface of the upper flange plate in the middle, the bottom end surface of the first web is welded with the top end of the first lower flange pipe,
the secondary truss comprises a first secondary truss which is connected between the middle main truss and the middle column or the middle section of the side, the whole first secondary truss is in a strip shape, the cross section of the first secondary truss is I-shaped, the secondary truss comprises an upper flange pipe, a second web plate, a second lower flange pipe and a second stiffening plate, the upper flange pipe and the second lower flange pipe are arranged in parallel,
the secondary truss further comprises a second secondary truss connected between two adjacent side columns, the middle side section is connected with the second secondary truss, side trusses are connected among the middle side section, the side section and the second secondary truss,
the second truss and the side truss are both pipe trusses.
The first stiffening plates are arranged at intervals along the length direction of the main truss, each stiffening plate is positioned between the upper flange plate and the first lower flange pipe and is vertical to the side surface of the first web, the inner side end surface of the first stiffening plate is welded with the outer side surface of the first web, the top end surface of the first stiffening plate is welded with the lower side surface of the upper flange plate, the bottom end surface of the first stiffening plate is welded with the upper part of the first lower flange pipe,
the non-node areas on the first web plate are separated by a group of first lightening holes, the first lightening holes are round, and the circle centers of the first lightening holes are positioned on the height central line of the first web plate.
The plate width of the upper flange plate is not larger than the outer diameter of the first lower flange pipe, and the outer edge of the first stiffening plate is flush with the outer edge of the upper flange plate.
The second stiffening plates are arranged at intervals along the length direction of the first truss, each second stiffening plate is positioned between the upper flange pipe and the second lower flange pipe and is vertical to the side surface of the second web, the inner side end surface of the second stiffening plate is welded with the outer side surface of the second web, the top end surface of the second stiffening plate is welded with the lower side surface of the upper flange pipe, the bottom end surface of the second stiffening plate is welded with the upper part of the second lower flange pipe,
the non-node areas on the second web plate are separated by second lightening holes, the second lightening holes are round, and the circle centers of the second lightening holes are located on the center line of the height of the second web plate.
The height of the main truss is greater than that of the secondary truss,
the first lower flange pipe is fixedly connected with the second lower flange pipe, and the upper flange pipe is fixedly connected with the side face of the first web plate below the upper flange plate.
The main truss is formed by splicing main truss units, the two end faces of the head and the tail of the main truss units are oblique end faces, the two oblique end faces are parallel, a first splicing clamping plate is arranged on two sides of a first web plate between two adjacent main truss units, and the two adjacent main truss units are spliced and bolted through a first high-strength connecting bolt, and the joint is welded,
the periphery of the first splice splint is provided with a girth welding seam, and the welding is full penetration welding seams.
The node areas of the structural columns are respectively provided with column connecting brackets which are used for connecting the roof trusses and are matched with members of the corresponding roof trusses,
the joint area of the structural column is provided with a column connecting bracket which is used for connecting the roof truss and is matched with a component of the corresponding roof truss, the column connecting bracket and the main truss are connected in a spliced manner through second splicing clamping plates arranged on two sides of the first web plate and welded at joints through second high-strength connecting bolts, and the column connecting bracket and the secondary truss are connected in a butt-spliced manner and welded at joints;
the node area of the main truss is provided with beam connecting brackets which are used for connecting the secondary trusses and are matched with the components of the corresponding secondary trusses, the beam connecting brackets and the secondary trusses are connected in a butt-joint way and welded at joints,
and girth welding seams are arranged around the second splicing clamping plates, and the welding is full penetration welding seams.
A construction method of a large-span multi-section combined truss roof structure system comprises the following construction steps:
step one, processing components in a factory according to a deepened design drawing;
step two, mounting a middle column and a side column;
assembling a first truss connected between the center columns, fixedly connecting a supporting column of a first temporary reinforcing structure of the truss at the top of the connection position of the first truss and the middle main truss, hoisting in place and connecting;
assembling a side main truss connected between the center posts, fixedly connecting a side unit of the middle section of the side with the center post, fixedly connecting a truss second temporary reinforcing structure between the center post and the side unit, and hoisting the rest units of the middle section of the side into position and connecting the rest units with the side unit to form a complete side middle section;
splicing the side edge sections, hoisting the side edge sections into place, and connecting two ends of the side edge sections to the middle column and the side columns respectively;
step six, splicing the second truss, and then hoisting the second truss into place to connect two ends of the second truss between two adjacent side columns respectively;
step seven, splicing the middle side sections, and then hoisting the middle side sections into positions to connect two ends of the middle side sections between the first truss in the step three and the second truss in the step six respectively;
step eight, fixedly connecting a first diagonal brace of a truss first temporary reinforcing structure on a supporting upright post;
step nine, splicing the middle section, fixedly connecting an edge unit of the middle section with a middle column, fixedly adjusting a chain block on a supporting upright post, guaranteeing the posture of the edge unit of the middle section through adjusting the chain block, hoisting other units of the middle section into position and connecting the other units with the edge unit to form a complete middle section, and continuously adjusting the chain block to guarantee the posture of the edge unit of the middle section when the other units are installed;
step ten, splicing the rest first trusses, hoisting in place, and sequentially and fixedly connecting the first trusses at corresponding positions between the middle main truss and the side main truss;
and step eleven, splicing the side trusses, and then hoisting the side trusses in place to fixedly connect the side trusses at corresponding positions.
The truss first temporary reinforcing structure comprises a supporting upright post which is erected at the top of the intersection of the middle section and the middle side section, a first diagonal brace which is fixedly connected between the top of the supporting upright post and the upper side of the middle side section, and an adjusting chain which is obliquely pulled and connected between the top of the supporting upright post and the upper side of the middle section,
the two ends of the adjusting chain block are respectively connected with a guy rope hook, and the guy rope hooks are respectively locked through first connecting lug plates fixed on the supporting upright post and the middle section.
The truss second temporary reinforcing structure comprises a second diagonal brace fixedly connected between a center pillar and an edge middle section, second connecting lug plates are fixedly connected to the center pillar and the lower flange of the edge main truss, and two ends of the second diagonal brace are bolted with the second connecting lug plates through bolts.
Compared with the prior art, the invention has the following characteristics and beneficial effects:
the large-span multi-section combined truss roof structure system is an irregularly-shaped truss system, and has the advantages of large truss span, complex structure, different elevations, hyperbolic structure as a whole and rigid connection nodes as connection modes. Therefore, the structure of the main truss is designed into a multi-section plate type combined truss, the secondary truss is designed into a plate type combined truss, and a part of pipe truss is adopted. The upper flange plate and the web plate of the main truss adopt steel plates meeting the design stress requirements, and proper honeycomb lightening holes are formed in the web plate; the lower flange adopts a circular tube, so that the height-width ratio of the components can be effectively controlled, the overall stability of the roof is improved, the structural steel amount is optimized, and the performance optimization and the structural optimization of the truss are comprehensively realized. In order to ensure that the whole dimension of the roof truss construction structure does not deviate greatly, and simultaneously ensure that truss construction accords with a design stress state, the truss structure has quite high requirements on connecting joints.
Compared with a general pipe truss, the structure performance of the special truss is obviously improved aiming at the connection node of the special truss; the truss is connected with the truss, the truss is connected with the steel column, the truss is connected with the bracket by adopting a single clamping plate high-strength bolt, then the web plate is subjected to full penetration welding, and the connecting plate is subjected to girth welding; and (5) performing full penetration welding on the upper flange rod piece and the lower flange rod piece. By adopting the connecting mode and the whole stress, the truss connecting rigidity is more reasonably ensured, and the installation accuracy and the installation efficiency are increased.
According to the large-span combined truss with the structure, reasonable sectional hoisting construction is carried out, the truss is connected with the truss by adopting a first temporary reinforcing structure, and the connection between the trusses is temporarily reinforced by adopting a support column and a inhaul cable; the truss is connected with the steel column by adopting the second temporary reinforcing structure, and the mounting method of the support-free jig frame is characterized in that under the condition of meeting construction stress, the construction procedure is optimized, the construction cost is saved, the mounting efficiency is improved, and the measure cost is saved.
Drawings
The invention is described in further detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a partially enlarged schematic structural view of fig. 1. A step of
Fig. 3 is a schematic structural view of the middle main truss of fig. 1.
Fig. 4 is a schematic structural view of a second temporary reinforcing structure.
Fig. 5 is a schematic cross-sectional view of a main truss.
Fig. 6 is a schematic side view of the main truss.
Reference numerals: 1-center pillar, 2-side pillar, 3-side main truss, 31-side section, 32-side middle section, 4-middle main truss, 41-middle side section, 42-middle section, 5-upper flange plate, 6-first web, 7-first lower flange pipe, 8-first sub-truss, 81-upper flange pipe, 82-second web, 83-second lower flange pipe, 9-second sub-truss, 10-side truss, 11-first stiffening plate, 12-first lightening hole, 13-second stiffening plate, 14-second lightening hole, 15-oblique end face, 16-first splice splint, 17-first high-strength connecting bolt, 18-second splice splint, 19-second high-strength connecting bolt, 20-first temporary reinforcing structure, 201-support upright, 202-first diagonal brace, 203-adjusting chain, 204-first connecting lug plate, 21-second temporary reinforcing structure, 211-second diagonal brace, 212-second connecting lug plate.
Detailed Description
1-6, a large span multi-section modular truss roofing system includes structural columns and a roofing truss connected to the structural columns.
The structural columns are connected to two longitudinal end parts of the roof truss and are divided into a middle column 1 and a side column 2 which are closer to each other according to the midspan distance between the structural columns and the roof truss.
The roof truss includes a longitudinal primary truss and a transverse secondary truss.
The main trusses are arranged in parallel at intervals and comprise side main trusses 3 on two sides and a middle main truss 4 in the middle.
The side main truss 3 is divided into three sections by structural columns, is fixedly connected between longitudinal columns of the structural columns, and is respectively provided with two side sections 31 and a side middle section 32, the middle column 1 is connected with the side middle section 32, and the middle column 1 is connected with the side column 2 to form the side section 31.
The middle main truss 4 is also divided into two middle side sections 41 and a middle section 42 according to the position of the side main truss 3, and the middle main truss is fixedly connected with the side main truss 3 or the structural column through the secondary truss.
The main truss is in a strip shape as a whole, the cross section of the main truss is I-shaped, the main truss comprises an upper flange plate 5, a first web plate 6, a first lower flange pipe 7 and a first stiffening plate 11, and the upper flange plate 5 and the first lower flange pipe 7 are arranged in parallel.
The first web 6 is perpendicular to the upper flange plate 5, the top end face of the first web 6 is welded with the lower side surface of the upper flange plate 5 in a centered manner, and the bottom end face of the first web 6 is welded with the top end of the first lower flange pipe 7.
In this embodiment, the upper flange plate has a plate width not larger than the outer diameter of the lower flange pipe. For example, the upper flange plate has a plate width a of 400mm to 450mm. The lower flange pipe is a circular pipe, and the diameter b of the lower flange pipe is 450mm. The diameter of the lightening holes is 800-1200 mm, and the arrangement distance between two adjacent lightening holes is 6-8 m. The intersecting length c of the stiffening plate and the lower flange pipe is 100mm-120mm. The upper flange plate may have two dimensions, one 400mm and one 450mm, with the outer edge of the stiffening plate being flush with the outer edge of the upper flange plate. The diameter of the lower flange tube is only one size, i.e., 450mm. The diameter of the lightening hole is 1000mm. The arrangement distance between two adjacent lightening holes is 6m.
The secondary truss comprises a first secondary truss 8 connected between the middle main truss 4 and the middle column 1 or between the secondary truss and the side middle section 32, the first secondary truss 8 is integrally in a strip shape, the cross section of the first secondary truss is I-shaped, the cross section of the first secondary truss comprises an upper flange pipe 81, a second web 82, a second lower flange pipe 83 and a second stiffening plate 13, and the upper flange pipe 81 and the second lower flange pipe 83 are arranged in parallel.
The secondary truss further comprises a second secondary truss 9 connected between two adjacent side columns, the middle side section 41 is connected with the second secondary truss 9, and the side truss 10 is connected among the middle side section 41, the side section 31 and the second secondary truss 9.
The second truss 9 and the side truss 10 are both pipe trusses.
The height of the main truss is larger than that of the secondary truss, and the connection position is guaranteed.
The first stiffening plates 11 are arranged in a group along the length direction of the main truss at intervals, each stiffening plate is located between the upper flange plate 5 and the first bottom flange pipe 7 and perpendicular to the side surface of the first web plate 6, the inner side end face of the first stiffening plate 11 is welded with the outer side face of the first web plate 6, the top end face of the first stiffening plate 11 is welded with the lower side face of the upper flange plate 5, and the bottom end face of the first stiffening plate 11 is welded with the upper portion of the first bottom flange pipe 7.
The non-node areas on the first web 6 are separated by a group of first lightening holes 12, the first lightening holes are round, and the circle center of the first lightening holes 12 is positioned on the height central line of the first web 6.
The width of the upper flange plate 5 is not larger than the outer diameter of the first lower flange pipe 7, and the outer edge of the first stiffening plate 11 is flush with the outer edge of the upper flange plate 5.
The second stiffening plates 13 are arranged in a group at intervals along the length direction of the first truss, each second stiffening plate 13 is located between the upper flange pipe 81 and the second lower flange pipe 83 and perpendicular to the side surface of the second web 82, the inner side end face of the second stiffening plate 13 is welded with the outer side face of the second web 82, the top end face of the second stiffening plate 13 is welded with the lower side face of the upper flange pipe 81, and the bottom end face of the second stiffening plate 13 is welded with the upper portion of the second lower flange pipe 83.
The non-node areas on the second web 82 are separated by second lightening holes 14, the second lightening holes 14 are circular, and the center of the second lightening holes 14 is located on the center line of the height of the second web 82.
The first bottom flange pipe 7 and the second bottom flange pipe 83 are fixedly connected, and the upper flange pipe 81 is fixedly connected to the side surface of the first web plate below the upper flange plate 5.
The main truss is formed by splicing main truss units, the head end and the tail end of each main truss unit are inclined end faces 15, the two inclined end faces 15 are parallel, the inclined end faces between two adjacent main truss units are spliced, and the two adjacent main truss units are spliced and bolted through first high-strength connecting bolts 17 and welded at joints by arranging first splicing clamping plates 16 on two sides of a first web plate 6.
The first splice strap 16 is provided with a girth weld around its periphery, and the welds are all full penetration welds.
The node area of the structural column is provided with column connecting brackets which are used for connecting the roof trusses and are matched with members of the corresponding roof trusses, the column connecting brackets are connected with the main trusses in a splicing way through second splicing clamping plates 18 arranged on two sides of the first web plate 6 and are welded at joints through second high-strength connecting bolts 19, and the column connecting brackets are connected with the secondary trusses in a butt-splicing way and are welded at joints.
The node area of the main truss is provided with beam connection brackets which are used for connecting the secondary trusses and are matched with the components of the corresponding secondary trusses, and the beam connection brackets and the secondary trusses are connected in a butt joint mode and welded at joints.
And girth welding seams are arranged around the second splicing clamping plates, and the welding is full penetration welding seams.
The construction method of the large-span multi-section combined truss roof structure system comprises the following construction steps:
step one, processing the components in a factory according to the deepened design drawing.
And step two, installing the middle column 1 and the side column 2.
Step three, assemble the first truss 8 that is connected between the center pillar 1, the first interim reinforced structure of truss includes the support column 201 that stands in middle section 41 and middle limit section 41 intersection department top, still includes the first diagonal brace 202 of fixed connection between the top of support column 201 and the middle limit section 41 upside, still includes the regulation chain 203 of slant pull joint between the top of support column 201 and the middle section 41 upside. Two ends of the adjusting chain are respectively connected with a guy cable hook, and the guy cable hooks are respectively locked through first connecting lug plates 204 fixed on the supporting upright posts and the middle section.
The top of the connection position of the first primary truss 8 and the middle main truss 4 is fixedly connected with the supporting upright 201 of the truss first temporary reinforcing structure 20, and the supporting upright is hoisted in place and connected.
And fourthly, assembling the side main truss 3 connected between the center posts 1, fixedly connecting the side units of the side middle section 32 with the center posts 1, fixedly connecting the truss second temporary reinforcing structure 21 between the center posts and the side units, and hoisting the rest units of the side middle section 32 to be in place and connecting the rest units with the side units to form the complete side middle section 32.
The truss second temporary reinforcing structure comprises a second diagonal brace 211 fixedly connected between a center pillar 1 and an edge middle section 32, second connecting lug plates 212 are fixedly connected to the lower flanges of the center pillar 1 and an edge main truss 3, and two ends of the second diagonal brace 211 are bolted to the second connecting lug plates 212 through bolts.
And fifthly, splicing the side edge sections 31, and then hoisting in place to connect the two ends of the side edge sections to the center column 1 and the side columns 2 respectively.
And step six, splicing the second truss 9, and then hoisting in place to connect two ends of the second truss between two adjacent side columns 2.
And step seven, splicing the middle edge sections 41, and then hoisting the middle edge sections into place to connect the two ends of the middle edge sections between the first truss 8 in the step three and the second truss 9 in the step six respectively.
Step eight, a first diagonal brace 202 of the truss first temporary reinforcement structure is fixedly connected to the support upright 201.
Step nine, splicing the middle section 42, fixedly connecting the side units of the middle section 42 with the middle column 1, fixedly adjusting the chain links 203 on the supporting upright columns 201, guaranteeing the postures of the side units of the middle section through adjusting the chain links, hoisting the rest units of the middle section 42 in place and connecting the rest units with the side units to form a complete middle section 42, and continuously adjusting the chain links to guarantee the postures of the side units of the middle section 42 when the rest units are installed.
And step ten, splicing the rest first trusses 8, hoisting in place, and sequentially and fixedly connecting the first trusses to corresponding positions between the middle main truss 4 and the side main trusses 3.
Step eleven, splicing the side trusses 10, and then hoisting the side trusses in place to fixedly connect the side trusses to corresponding positions.
Claims (10)
1. The utility model provides a large-span multi-section combination formula truss roofing structure system, includes the structural column and the roofing truss who is connected with the structural column, its characterized in that:
the structural columns are connected with two longitudinal end parts of the roof truss and are divided into a middle column (1) and a far side column (2) according to the midspan distance with the roof truss,
the roof truss comprises a longitudinal main truss and a transverse secondary truss,
the main trusses are arranged in parallel at intervals and comprise side main trusses (3) at two sides and a middle main truss (4) in the middle,
the side main truss (3) is divided into three sections by structural columns and is fixedly connected between longitudinal columns of the structural columns, two side sections (31) are respectively 5 a side middle section (32), the middle column (1) is connected with the side column (2) and is connected with the side section (31),
the middle main truss (4) is also divided into two middle side sections (41) and a middle section (42) according to the position of the side main truss (3), the middle main truss is fixedly connected with the side main truss (3) or the structural column through the secondary truss,
the whole main truss is in a strip shape, the cross section of the main truss is I-shaped, the main truss comprises an upper flange plate (5), a first web plate (6), a first lower flange pipe (7) and a first stiffening plate (11), the upper flange plate (5) and the first lower flange pipe (7) are arranged in parallel,
the first web (6) is perpendicular to the upper flange plate (5), the top end surface of the first web (6) is welded with the lower side surface of the upper flange plate (5) in the middle, the bottom end surface of the first web (6) is welded with the top end of the first lower flange pipe (7),
the secondary truss comprises a first secondary truss (8) which is connected between the middle main truss (4) and the middle column (1) or between the secondary truss and the side middle section (32), the first secondary truss (8) is integrally in a strip shape, the cross section of the first secondary truss is I-shaped, the secondary truss comprises an upper flange pipe (81), a second web plate (82), a second lower flange pipe (83) and a second stiffening plate (13), the upper flange pipe (81) and the second lower flange pipe (83) are arranged in parallel,
the secondary truss further comprises a second secondary truss (9) connected between two adjacent side columns, the middle side section (41) is connected with the second secondary truss (9), the side truss (10) is connected among the middle side section (41), the side section (31) and the second secondary truss (9),
the second truss (9) and the side truss (10) are both pipe trusses.
2. The large span multi-section composite truss roofing structure system of claim 1 wherein: the first stiffening plates (11) are arranged at intervals along the length direction of the main truss, each stiffening plate is positioned between the upper flange plate (5) and the first lower flange pipe (7) and is perpendicular to the side surface of the first web plate (6), the inner side end surface of the first stiffening plate (11) is welded with the outer side surface of the first web plate (6), the top end surface of the first stiffening plate (11) is welded with the lower side surface of the upper flange plate (5), the bottom end surface of the first stiffening plate (11) is welded with the upper part of the first lower flange pipe (7) in a penetration way,
the non-node area on the first web (6) is separated by a group of first lightening holes (12), the first lightening holes are round, and the center of the first lightening holes (12) is located on the center line of the height of the first web (6).
3. The large span multi-section composite truss roofing structure system of claim 1 wherein: the width of the upper flange plate (5) is not larger than the outer diameter of the first bottom flange pipe (7), and the outer edge of the first stiffening plate (11) is flush with the outer edge of the upper flange plate (5).
4. The large span multi-section composite truss roofing structure system of claim 1 wherein: the second stiffening plates (13) are arranged in a group at intervals along the length direction of the first truss, each second stiffening plate (13) is positioned between the upper flange pipe (81) and the second lower flange pipe (83) and is perpendicular to the side surface of the second web plate (82), the inner side end surface of the second stiffening plate (13) is welded with the outer side surface of the second web plate (82), the top end surface of the second stiffening plate (13) is welded with the lower side surface of the upper flange pipe (81), the bottom end surface of the second stiffening plate (13) is welded with the upper part of the second lower flange pipe (83) in a penetration way,
the non-node area on the second web (82) is separated by a second lightening hole (14), the second lightening hole (14) is circular, and the center of the second lightening hole (14) is positioned on the center line of the height of the second web (82).
5. The large span multi-section composite truss roofing structure system of claim 1 wherein: the height of the main truss is greater than that of the secondary truss,
the first lower flange pipe (7) is fixedly connected with the second lower flange pipe (83), and the upper flange pipe (81) is fixedly connected with the side face of the first web plate below the upper flange plate (5).
6. The large span multi section composite truss roofing structure system of any of claims 1 to 5 wherein: the main truss is formed by splicing main truss units, the two end faces of the head and the tail of the main truss units are inclined end faces (15), the two inclined end faces (15) are parallel, a first splicing clamping plate (16) is arranged on two sides of a first web plate (6) between two adjacent main truss units, and the two adjacent main truss units are spliced and bolted through a first high-strength connecting bolt (17) and welded at a joint,
the periphery of the first splice clamping plate (16) is provided with a girth welding seam, and the welding is full penetration welding seams.
7. The large span multi section composite truss roofing structure system of claim 6 wherein: the joint area of the structural column is provided with a column connecting bracket which is used for connecting the roof truss and is matched with a member of the corresponding roof truss, second splicing clamping plates (18) are arranged on two sides of the first web plate (6) between the column connecting bracket and the main truss, the column connecting bracket and the sub-truss are spliced and connected through second high-strength connecting bolts (19), and the joint is welded;
the node area of the main truss is provided with beam connecting brackets which are used for connecting the secondary trusses and are matched with the components of the corresponding secondary trusses, the beam connecting brackets and the secondary trusses are connected in a butt-joint way and welded at joints,
and girth welding seams are arranged around the second splicing clamping plates, and the welding is full penetration welding seams.
8. A method of constructing a large span multi-section composite truss roofing structure system according to any one of claims 1-7, characterized by the steps of:
step one, processing components in a factory according to a deepened design drawing;
step two, installing a middle column (1) and a side column (2);
assembling a first truss (8) connected between the center columns (1), and fixedly connecting a supporting column (201) of a truss first temporary reinforcing structure (20) at the top of the connection position of the first truss (8) and the middle main truss (4), hoisting in place and connecting;
assembling a side main truss (3) connected between the center columns (1), fixedly connecting side units of a side middle section (32) with the center columns (1), fixedly connecting truss second temporary reinforcing structures (21) between the center columns and the side units, hoisting other units of the side middle section (32) into place, and connecting the rest units with the side units to form a complete side middle section (32);
splicing the side edge sections (31), and hoisting the side edge sections into place to connect two ends of the side edge sections to the middle column (1) and the side column (2) respectively;
step six, splicing the second truss (9), and then hoisting the second truss into place to connect two ends of the second truss between two adjacent side columns (2) respectively;
step seven, splicing the middle edge sections (41), and then hoisting the middle edge sections into place to connect two ends of the middle edge sections between the first truss (8) in the step three and the second truss (9) in the step six respectively;
step eight, a first diagonal brace (202) of a truss first temporary reinforcing structure is fixedly connected to a supporting upright (201);
step nine, splicing the middle section (42), fixedly connecting an edge unit of the middle section (42) with a middle column (1), fixedly adjusting a chain block (203) on a supporting upright column (201), guaranteeing the posture of the edge unit of the middle section by adjusting the chain block, hoisting other units of the middle section (42) into place, connecting the other units with the edge unit to form a complete middle section (42), and continuously adjusting the chain block to guarantee the posture of the edge unit of the middle section (42) when installing the other units;
step ten, splicing the rest first trusses (8), hoisting in place and sequentially and fixedly connecting the first trusses with corresponding positions between the middle main truss (4) and the side main truss (3);
and step eleven, splicing the side trusses (10), and then hoisting the side trusses into position to fixedly connect the side trusses on corresponding positions.
9. The method for constructing the large-span multi-section combined truss roof structural system according to claim 8, wherein the method comprises the following steps:
the truss first temporary reinforcing structure comprises a supporting upright post (201) which is erected at the top of the intersection of the middle section (42) and the middle side section (41), a first diagonal brace (202) which is fixedly connected between the top of the supporting upright post (201) and the upper side of the middle side section (41), and an adjusting chain block (203) which is obliquely pulled and connected between the top of the supporting upright post (201) and the upper side of the middle section (42),
two ends of the adjusting chain block are respectively connected with a guy rope hook, and the guy rope hooks are respectively locked through first connecting lug plates (204) fixed on the supporting upright posts and the middle section.
10. The method for constructing the large-span multi-section combined truss roof structure system according to claim 8 or 9, wherein the method comprises the following steps:
the truss second temporary reinforcing structure comprises a second inclined stay bar (211) fixedly connected between a center pillar (1) and a side middle section (32), second connecting lug plates (212) are fixedly connected to the lower flanges of the center pillar (1) and the side main truss (3), and two ends of the second inclined stay bar (211) are bolted with the second connecting lug plates (212) through bolts.
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| CN110107095B (en) * | 2019-04-30 | 2021-01-01 | 中国建筑第八工程局有限公司 | Mounting method of high-altitude large-span steel truss |
| CN110076468B (en) * | 2019-06-05 | 2023-06-02 | 浙江中南绿建科技集团有限公司 | Secondary truss installation method and temporary fixing device thereof |
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| CN114775881B (en) * | 2022-05-10 | 2022-11-08 | 中国建筑第二工程局有限公司 | Dome structure hoisting construction method and mounting and connecting structure |
| CN115075562B (en) * | 2022-06-29 | 2024-06-11 | 浙江精工钢结构集团有限公司 | Method for releasing additional stress of large-span truss structure partition phased construction |
| CN115324360A (en) * | 2022-07-27 | 2022-11-11 | 成都建工第四建筑工程有限公司 | Construction method of large-span suspended truss |
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