CN109469257B - Large-span gradual-change polygonal cross section parallel truss roof and construction method - Google Patents
Large-span gradual-change polygonal cross section parallel truss roof and construction method Download PDFInfo
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- CN109469257B CN109469257B CN201811503663.XA CN201811503663A CN109469257B CN 109469257 B CN109469257 B CN 109469257B CN 201811503663 A CN201811503663 A CN 201811503663A CN 109469257 B CN109469257 B CN 109469257B
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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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- 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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Abstract
A large-span gradual change polygonal cross section parallel truss roof and a construction method thereof comprise two groups of side span trusses and a group of middle span trusses between the side span trusses; the side span truss and the middle span truss both comprise an upper chord main rod, a lower chord main rod, a main straight web member connected between the chord main rod and the lower chord main rod, waist rods distributed on two sides of the plane of the chord main rod and the lower chord main rod, and a horizontal straight rod between the two waist rods; the side truss and the middle truss have the same longitudinal length and are connected with each other through a horizontal connecting rod and an inclined connecting rod. The trusses in the invention all adopt variable cross-section design, thereby ensuring the indoor clear height of the building and having strong adaptability to the form of the upper building; and the horizontal scissor struts in the side span truss are arranged, so that the bearing force of two sides of the roof is more stable. The arrangement of the bars in the truss may enhance the integrity and stability of the space truss. The invention is node connection of the rod pieces, and prefabrication and assembly are carried out according to the design of the truss during construction, or synchronous construction of the units is carried out, so that the construction time is effectively saved.
Description
Technical Field
The invention belongs to the field of truss roof construction, and particularly relates to a large-span gradual-change polygonal cross section parallel truss roof and a construction method thereof.
Background
Nowadays, buildings such as large-span factory buildings, warehouses, reporting halls and the like are more and more, and have higher requirements on the headroom of the buildings, so that stricter requirements on the roof form and the stress performance of the buildings are also provided. The prior truss roof adopts a constant-section space truss, the space utilization lacks form change, and the construction technology of the inverted triangle truss corresponding to the space utilization mainly utilizes the stress performance of the truss in which the upper chord is pressed and the lower chord is pulled, but the stress of the truss in a local part, particularly in the midspan position, is unreasonable because the cross section area of the inverted triangle truss is basically unchanged, and the sensitivity adaptability of the unchanged cross section to the load change of the uneven upper structure is poor. In the roof structure with super large span and large span, the cross section of the truss is often set to be large, the space for building is further wasted, or the prestressed cable is added in the truss, and the construction steps are complicated, so that the double waste of building space and materials is caused, and therefore, the truss roof form and the construction method for the large span building structure are needed to be provided, not only can the space requirement for building use be met, but also the stress of the structure is reasonable.
Disclosure of Invention
The invention provides a large-span gradual-change polygonal cross section parallel truss roof and a construction method thereof, which are used for solving the problems, and the concrete implementation scheme is as follows:
a large-span gradual change polygonal cross section parallel truss roof comprises two groups of parallel side-span trusses and a group of middle-span trusses parallel in the middle of the two groups of side-span trusses; the side span truss and the middle span truss both comprise an upper chord main rod and a lower chord main rod which are vertically disjoint in the same vertical plane, a group of main straight web members which are connected and distributed between the upper chord main rod and the lower chord main rod at intervals, waist rods which are distributed on two sides of the plane where the upper chord main rod and the lower chord main rod are positioned and are symmetrically arranged in parallel with each other, and a group of horizontal straight rods which are connected between the two waist rods at intervals in parallel; the longitudinal lengths of the midspan trusses of the side span trusses are consistent, horizontal connecting rods which are distributed at intervals are connected between the two side span trusses, between the side span trusses and the midspan trusses and between the two midspan trusses through waist bars at two sides, and oblique connecting rods are connected between the horizontal connecting rods.
The upper chord main rod and the lower chord main rod are symmetrical arc-shaped rods, truss upright posts are vertically connected between the end parts of the two sides, and horizontal connecting stiffening beams with the through length are connected between the truss upright posts; the heights of the main straight web members are gradually decreased from two sides to the middle; the plane of the waist bar is perpendicular to the planes of the upper chord main bar and the lower chord main bar, and the horizontal straight bar is vertically connected with the corresponding main straight web member; the upper chord main rod and the lower chord main rod are connected with a scissor brace between the truss upright post and the adjacent main straight web member; the truss upright posts are correspondingly and vertically connected with the horizontal straight rods at the ends of the waist bars.
The main diagonal web members are connected between the adjacent main diagonal web members, the main diagonal web members on the two sides are symmetrically arranged by taking the main diagonal web member in the middle of the space truss as the center, wherein the main diagonal web member on the left side of the main diagonal web member in the middle inclines to the left side, and the main diagonal web member on the right side of the main diagonal web member in the middle inclines to the right side; and two ends of the main diagonal web member are respectively connected between the upper end and the lower end of the adjacent main straight web member.
The upper chord main rod and the lower chord main rod are respectively connected with an upper chord secondary rod and a lower chord secondary rod in the same direction on two sides of the long middle part; the upper chord sub-rod and the lower chord sub-rod are symmetrically arranged in the middle of the space truss.
The upper chord main rod, the waist rod, the lower chord main rod and the other waist rod are sequentially connected with a vertical face inclined rod on the same vertical face to form a polygonal supporting frame; the polygonal supporting frames are divided into two groups, wherein the first group is enclosed on the peripheries of the main web members and the horizontal straight rods to form a cored polygonal supporting frame, and the second group is enclosed on the vacant positions to form a hollow polygonal supporting frame; the first and second groups are alternately spaced apart in parallel along the length of the truss.
The section where the polygon support frame is located comprises an upper chord main rod, a lower chord main rod, an upper chord secondary rod and a lower chord secondary rod, and the polygon support upper elevation inclined rod is connected to the upper chord secondary rod and the lower chord secondary rod.
The middle truss is connected with a horizontal diagonal rod between the second group of hollow polygonal supporting frames at the two ends; the side span trusses are connected with horizontal diagonal rods to form horizontal scissor supports between all the second group of hollow polygonal supporting frames, wherein the crossing points of the horizontal diagonal rods or the horizontal scissor supports are connected with the junction of the main straight web members and the horizontal straight rods in a penetrating way; the side span truss is characterized in that secondary diagonal web members are connected between the upper end parts and the lower end parts of adjacent vertical face diagonal members on the two polygonal supporting frames, and the adjacent secondary diagonal web members are symmetrically distributed about the commonly connected vertical face diagonal members.
The two ends of the waist bar are respectively extended, and an end sealing tube is connected between the ends of the two waist bars; the end sealing pipes are positioned at the outer side of the end face of the truss upright post, are positioned on the same plane with the horizontal straight rod and are parallel to the horizontal straight rod, and the adjacent end sealing pipes are positioned on the same horizontal line and are connected with each other; polygonal frames are arranged between the end sealing pipe and the planes of the upper chord main rod, the lower chord main rod and the end of the waist bar.
The polygonal frame is a hexagonal plane frame and is symmetrically arranged about the truss upright post; the polygonal frame is connected with the end of the end sealing pipe and the end of the horizontal straight rod on the truss upright post through the waist rod; the upper connecting point of the connecting part of the polygonal frame and the waist bar is connected with the upper end part of the truss upright post through a connecting rod, and the lower connecting point of the connecting part of the polygonal frame and the waist bar is connected with the lower end part of the truss upright post through a connecting rod.
The construction method of the large-span gradual change polygonal section parallel truss roof comprises the following specific steps of:
step one, building a space truss jig frame and installing truss upright posts at two ends;
step two, positioning and mounting an upper chord main rod and a lower chord main rod according to the position of the space truss, and then mounting and connecting an upper chord secondary rod and a lower chord secondary rod in the middle of the upper chord main rod and the lower chord main rod;
correcting and adjusting the positions of the installed rod members, marking the positions of the main straight web members on the upper chord main rod and the lower chord main rod, and then sequentially installing the main straight web members and the main inclined web members;
step four, erecting a waist bar, installing a horizontal straight bar, connecting the waist bar with the main web bar, and accurately positioning and measuring the position of the waist bar;
step five, installing vertical face inclined bars among the upper chord main bar, the lower chord main bar and the waist bars, installing horizontal inclined bars and a scissor brace corresponding to the side span truss and the middle span truss, and installing a last inclined web member on the side span truss;
installing an end sealing pipe at the outer side of the end of the truss main body, positioning and connecting the end sealing pipe with the upper chord main rod and the lower chord main rod, and connecting and fixing the end sealing pipe, the upper chord main rod and the lower chord main rod by using a connecting rod;
step seven, respectively completing the main body manufacturing of the side span truss and the middle span truss from the step one to the step six, and then respectively arranging the side span truss and the middle span truss according to the design;
and step eight, connecting horizontal connecting rods and inclined connecting rods among the truss straddling frames at two sides, between the side truss and the middle truss straddling frame and between waist bars at two sides of the middle truss straddling frame, and thus completing the manufacturing of truss roofs.
The invention has the following beneficial effects:
the invention provides a large-span gradual-change polygonal cross section parallel truss roof, wherein a side-span truss and a middle-span truss are both of variable cross section design, the cross section area at two ends of the truss is large, and the middle cross section area is small, so that the indoor clear height is effectively utilized under the condition that the overall height of a building is unchanged, the adaptability to the form of an upper building is strong, and the roof is insensitive to uneven roof load change; and the horizontal scissor struts in the side span truss are arranged, so that the bearing force of two sides of the roof is more stable. The upper chord secondary rod, the lower chord secondary rod and the waist rod are arranged in the truss, so that the upper bearing force of the upper chord main rod and the lower chord main rod can be shared, and the bearing capacity of the space truss is effectively enhanced; the arrangement of the main straight web member, the secondary inclined web member, the vertical surface inclined member and other members, the arrangement of the horizontal connecting rod and the inclined connecting rod between the side span truss and the middle span truss can strengthen the integrity of the space truss, and the arrangement of the polygonal frames at the two ends and the connection of the end sealing pipes between the trusses can strengthen the stability of end force transmission. The invention is node connection of the rod pieces, and prefabrication and assembly can be carried out according to the design of the truss during construction or synchronous construction of the units can be carried out, so that the construction time is effectively saved, and the construction efficiency is improved.
Drawings
FIG. 1 is a schematic view of a large span tapered polygonal cross section parallel truss roof;
FIG. 2 is a schematic illustration of a midspan truss;
FIG. 3 is a schematic view of a side span truss;
FIG. 4 is a schematic view of a stiffener connection node;
fig. 5 is a schematic diagram of a polygonal frame connection.
Reference numerals: 1-a side span truss; 2-midspan truss; 3-horizontal links; 4-inclined connecting rods; 5-truss columns; 6-lower chord main bar; 7-winding a main rod; 8-waist bars; 9-main straight web members; 10-a main diagonal web member; 11-vertical face diagonal bars; 12-a horizontal straight rod; 13-horizontal diagonal rods; 14-time diagonal web members; 15-reinforcing bars; 16-a lower horizontal bar; 17-upper horizontal bars; 18-overhanging diagonal rods; 19-end sealing; 20-winding secondary rod; 21-lower chordal lower pole.
Detailed Description
Referring to fig. 1 to 3, a large-span gradual change polygonal cross section parallel truss roof comprises two groups of parallel side truss frames 1 and a group of middle truss frames 2 parallel to the middle of the two groups of side truss frames 1; the side span truss 1 and the middle span truss 2 both comprise an upper chord main rod 7 and a lower chord main rod 6 which are vertically disjoint in the same vertical plane, a group of main straight web members 9 which are connected and distributed between the upper chord main rod 7 and the lower chord main rod 6 at intervals, waist rods 8 which are distributed on two sides of the plane where the upper chord main rod 7 and the lower chord main rod 6 are positioned and are symmetrically arranged in parallel with each other, and a group of horizontal straight rods 12 which are connected between the two waist rods 8 at intervals in parallel; the longitudinal lengths of the midspan trusses 2 of the side span trusses 1 are consistent, horizontal connecting rods 3 which are distributed at intervals are connected between the side span trusses 1, between the side span trusses 1 and the midspan trusses 2 and between the two midspan trusses 2 through waist bars 8 at two sides, and oblique connecting rods 4 are connected between the horizontal connecting rods 3.
In this embodiment, a group of side truss frames 1 includes two side truss frames 1 connected in parallel, and twelve middle truss frames 2 are connected in parallel between the side truss frames 1; the upper chord main rod 7 and the lower chord main rod 6 of the truss are symmetrical arc-shaped steel pipes, truss upright posts 5 are vertically connected between the end parts of the two sides, the truss upright posts 5 are square steel posts, and horizontal connecting stiffening beams are connected between the adjacent truss upright posts 5; the heights of the main straight web members 9 decrease from two sides to the middle in sequence; the plane of the waist bar 8 is perpendicular to the planes of the upper chord main bar 7 and the lower chord main bar 6, and the horizontal straight bar 12 is perpendicularly connected with the corresponding main web bar 9; the upper chord main rod 7 and the lower chord main rod 6 are connected with a scissor brace between the truss upright post 5 and the adjacent main straight web member 9; the truss upright 5 is correspondingly and vertically connected with a horizontal straight rod 12 at the end part of the waist rod 8.
In this embodiment, main diagonal members 10 are connected between adjacent main straight web members 9, and the main diagonal members 10 on two sides are symmetrically arranged with the main straight web member 9 in the middle of the space truss as the center, wherein the main diagonal member 10 on the left side of the main straight web member 9 leans to the left side, and the main diagonal member 10 on the right side of the main straight web member 9 leans to the right side; the two ends of the main diagonal web member 10 are respectively connected between the upper end and the lower end of the adjacent main straight web member 9.
In this embodiment, the two sides of the long middle parts of the upper chord main rod 7 and the lower chord main rod 6 are respectively connected with an upper chord sub rod 20 and a lower chord sub rod 21 in the same direction; the upper chord sub-rod 20 and the lower chord sub-rod 21 are symmetrically arranged in the middle of the space truss.
In this embodiment, a vertical surface inclined rod 11 is sequentially connected between the upper chord main rod 7, the waist rod 8, the lower chord main rod 6 and the other waist rod 8 on the same vertical surface to form a polygonal supporting frame; the polygonal supporting frames are divided into two groups, wherein the first group is enclosed on the peripheries of the main web members 9 and the horizontal straight rods 12 to form a cored polygonal supporting frame, and the second group is enclosed on the vacant positions to form a hollow polygonal supporting frame; the first and second groups are alternately spaced apart in parallel along the length of the truss.
In this embodiment, the section of the polygonal supporting frame includes an upper chord main rod 7, a lower chord main rod 6, an upper chord sub rod 20 and a lower chord sub rod 21, and the inclined rod 11 of the polygonal supporting frame upper vertical surface is connected to the upper chord sub rod 20 and the lower chord sub rod 21.
In this embodiment, the midspan truss 2 is connected with a horizontal diagonal 13 between the second group of hollow polygonal supporting frames at two ends; the side span truss 1 is connected with horizontal diagonal rods 13 between all second groups of hollow polygonal supporting frames to form horizontal scissor struts, wherein the crossing points of the horizontal diagonal rods 13 or the horizontal scissor struts are connected with the junction of the main straight web members 9 and the horizontal straight rods 12 in a penetrating way; the side span truss 1 is connected with secondary diagonal web members 14 between the upper end and the lower end of the adjacent vertical face diagonal members 11 on the two polygonal supporting frames, and the adjacent secondary diagonal web members 14 are symmetrically distributed about the commonly connected vertical face diagonal members 11.
Referring to fig. 4, a first group of polygonal supporting frames is provided with a group of reinforcing rods 15 on the main straight web members 9, wherein the reinforcing rods 15 are circular steel pipes and are symmetrically distributed on two sides of the main straight web members 9; in the vertical plane of the first group of polygonal supporting frames, only the upper chord secondary rod 20 is arranged, one end of the reinforcing rod member 15 is connected to the middle upper part of the main straight web member 9, and the other end is connected to the end part of the upper chord secondary rod 20; only the lower chord member position 21 is arranged in the vertical plane of the first group of polygonal supporting frames, one end of the reinforcing rod member 15 is connected to the middle lower part of the main straight web member 9, and the other end is connected to the end part of the lower chord secondary rod 21; in fig. 4, the cross section of the end of the upper chord sub-rod 20 is the common position of the upper chord sub-rod 20 and the lower chord sub-rod 21 in the vertical plane of the first group of polygonal supporting frames, and the reinforcing rod pieces 15 are respectively and commonly arranged.
Referring to fig. 5, two ends of the waist bar 8 are respectively extended, and an end sealing tube 19 is connected between the ends of the two waist bars 8; the end sealing pipes 19 are positioned on the outer side of the end face of the truss upright 5, the end sealing pipes 19 and the horizontal straight rods 12 are on the same plane and parallel to the horizontal straight rods 12, and the adjacent end sealing pipes 19 are on the same horizontal line and connected with each other; polygonal frames are arranged between the end sealing pipe 19 and the planes of the upper chord main rod 7, the lower chord main rod 6 and the waist rod 8.
In this embodiment, the polygonal frame is a hexagonal plane frame, and is symmetrically arranged about the truss column 5; the polygonal frame is connected with the end of the end sealing pipe 19 and the end of the horizontal straight rod 12 on the truss upright 5 through the waist rod 8; the upper connecting point of the connecting part of the polygonal frame and the waist bar 8 is connected with the upper end part of the truss upright 5 through a connecting rod, and the lower connecting point of the connecting part of the polygonal frame and the waist bar 8 is connected with the lower end part of the truss upright 5 through a connecting rod.
In this embodiment, the polygonal frame includes an upper horizontal rod 17 and a lower horizontal rod 16 that are parallel to each other up and down, and four cantilever diagonal rods 18 between the upper horizontal rod 17 and the lower horizontal rod 16, where the four cantilever diagonal rods 18 are divided into two groups and connected in a V-shape at the ends, the V-shaped connection points are outward, and the internal included angle is smaller than 180 °; the V-shaped connection point and the end sealing pipe 19 are positioned on the same plane and are connected with the end of the end sealing pipe 19 and the end of the horizontal straight rod 12 on the truss upright 5 through the waist rod 8; the connection point of the cantilever inclined rod 18 and the upper horizontal rod 17 is connected with the upper end part of the truss upright 5 through a connecting rod, and the connection point of the cantilever inclined rod 18 and the lower horizontal rod 16 is connected with the lower end part of the truss upright 5 through a connecting rod; the two ends and the middle parts of the upper horizontal rod 17 and the lower horizontal rod 16 of the polygonal frame are respectively correspondingly connected with the two ends and the middle part of the end sealing tube 19; the middle part of the lower horizontal rod 16 is connected with the web members at the two ends of the upper horizontal rod 17, and the end part of the lower horizontal rod 16 is correspondingly connected with the web members at the end part of the upper horizontal rod 17.
In the embodiment, steel castings are arranged among the outermost main web members 9 at the two ends of the space truss, the upper chord main beam and the lower chord main beam, and the steel castings are also arranged at the end heads of the lower chord secondary beams; the cast steel is a node connecting piece, is arranged at a multi-interface node, can prefabricate a multi-interface joint and is convenient to prefabricate and install.
Referring to fig. 1 to 5, a construction method of a large-span gradual change polygonal cross section parallel truss roof is further described, and the specific steps are as follows:
step one, building a space truss jig frame and installing truss upright posts 5 at two ends;
step two, positioning and mounting an upper chord main rod 7 and a lower chord main rod 6 according to the position of the space truss, and then mounting and connecting an upper chord secondary rod 20 and a lower chord secondary rod 21 in the middle of the upper chord main rod 7 and the lower chord main rod 6;
correcting and adjusting the positions of the installed members, marking the positions of the main straight web members 9 on the upper chord main rod 7 and the lower chord main rod 6, and then sequentially installing the main straight web members 9 and the main inclined web members 10;
step four, erecting a waist bar 8, installing a horizontal straight bar 12, connecting with the main web bar 9, and accurately positioning and measuring the position of the waist bar 8;
step five, installing vertical face inclined bars 11 between the upper chord main bar 7, the lower chord main bar 6 and the waist bars 8, installing horizontal inclined bars 13 and scissor struts corresponding to the side span truss 1 and the middle span truss 2, and installing last inclined web members 14 on the side span truss 1;
step six, installing an end sealing pipe 19 outside the end of the truss main body, positioning and connecting the end sealing pipe 19 with the upper chord main rod 7 and the lower chord main rod 6, and connecting and fixing the end sealing pipe 19 with the upper chord main rod 6 by using a connecting rod;
step seven, respectively completing the main body manufacturing of the side span truss 1 and the middle span truss 2 in the step one to the step six, and then respectively arranging the side span truss 1 and the middle span truss 2 in parallel according to the design;
and step eight, connecting horizontal connecting rods 3 and inclined connecting rods 4 among the two side span trusses 1, the side span trusses 1 and the middle span trusses 2 and among the two side waist bars 8 among the middle span trusses 2, connecting end sealing bars and horizontally connecting reinforcing beams among the mounting truss upright posts 5, so as to finish the manufacturing of truss roofs.
The construction method for the integral truss roof can be used for installing the space truss in a split mode, namely, the space truss is symmetrically divided into different truss sub-units, the truss sub-units are respectively and simultaneously constructed, and finally, the sub-units are connected and the through long rod pieces are installed, so that the construction efficiency can be improved.
It is to be understood that the above examples are presented solely for the purpose of clearly illustrating the salient features of the present invention and are not intended to limit the scope of the present invention; other variations and modifications of the present invention will be apparent to those of skill in the art, and it is intended to cover all such modifications and variations of this invention without departing from the scope of the invention as defined by the appended claims.
Claims (7)
1. A large-span gradual change polygon cross-section parallel truss roof, its characterized in that: the two-way cross truss comprises two groups of parallel cross trusses (1) and a group of middle cross trusses (2) which are parallel and connected in the middle of the two groups of cross trusses (1); the side span truss (1) and the middle span truss (2) both comprise an upper chord main rod (7) and a lower chord main rod (6) which are not intersected up and down in the same vertical plane, a group of main straight web rods (9) which are connected and distributed between the upper chord main rod (7) and the lower chord main rod (6) at intervals, waist rods (8) which are distributed on two sides of the plane where the upper chord main rod (7) and the lower chord main rod (6) are located and are symmetrically arranged in parallel with each other, and a group of horizontal straight rods (12) which are connected between the two waist rods (8) at intervals in parallel; the longitudinal lengths of the midspan trusses (2) of the side span trusses (1) are consistent, horizontal connecting rods (3) which are distributed at intervals are connected between the side span trusses (1), between the side span trusses (1) and the midspan trusses (2) and between the two midspan trusses (2) through waist bars (8) at two sides, and oblique connecting rods (4) are connected between the horizontal connecting rods (3); the upper chord main rod (7) and the lower chord main rod (6) are symmetrical arc-shaped rods, truss upright posts (5) are vertically connected between the end parts of the two sides, and horizontal connecting stiffening beams with the through length are connected between the truss upright posts (5); the heights of the main straight web members (9) are gradually decreased from two sides to the middle; the plane of the waist bar (8) is perpendicular to the planes of the upper chord main bar (7) and the lower chord main bar (6), and the horizontal straight bar (12) is perpendicular to the corresponding main straight web bar (9); the upper chord main rod (7) and the lower chord main rod (6) are connected with a scissor brace between the truss upright post (5) and the adjacent main straight web member (9); the truss upright post (5) is vertically connected with a horizontal straight rod (12) at the end part of the waist rod (8) correspondingly; a main diagonal web member (10) is connected between the adjacent main straight web members (9), the main diagonal web members (10) on two sides are symmetrically arranged by taking the main straight web member (9) in the middle of the space truss as the center, wherein the main diagonal web member (10) on the left side of the main straight web member (9) in the middle leans to the left side, and the main diagonal web member (10) on the right side of the main straight web member (9) in the middle leans to the right side; two ends of the main diagonal web member (10) are respectively connected between the upper end and the lower end of the adjacent main straight web member (9);
the upper chord main rod (7), the waist rod (8), the lower chord main rod (6) and the other waist rod (8) are sequentially connected with a vertical surface inclined rod (11) on the same vertical surface to form a polygonal supporting frame; the polygonal supporting frames are divided into two groups, wherein the first group is enclosed on the peripheries of the main straight web members (9) and the horizontal straight rods (12) to form a cored polygonal supporting frame, and the second group is enclosed on the vacant positions to form a hollow polygonal supporting frame; the first group and the second group are alternately distributed in parallel at intervals in the longitudinal direction of the truss;
the two ends of the waist bars (8) are respectively extended, and an end sealing tube (19) is connected between the ends of the two waist bars (8).
2. The large span gradient polygonal section parallel truss roof of claim 1, wherein: the upper chord main rod (7) and the lower chord main rod (6) are respectively connected with an upper chord secondary rod (20) and a lower chord secondary rod (21) in the same direction on two sides of the long middle part; the upper chord sub-rod (20) and the lower chord sub-rod (21) are symmetrically arranged in the middle of the space truss.
3. A large span gradient polygonal section parallel truss roof as defined in claim 2 wherein: the section where the polygonal support frame is located comprises an upper chord main rod (7), a lower chord main rod (6), an upper chord secondary rod (20) and a lower chord secondary rod (21), and the polygonal support frame upper elevation inclined rod (11) is connected to the upper chord secondary rod (20) and the lower chord secondary rod (21).
4. A large span tapered polygonal section parallel truss roof as defined in claim 3 wherein: the middle truss (2) is connected with a horizontal diagonal rod (13) between the second group of hollow polygonal supporting frames at the two ends; the side span truss (1) is connected with horizontal diagonal rods (13) between all second groups of hollow polygonal supporting frames to form horizontal scissor struts, wherein the cross points of the horizontal diagonal rods (13) or the horizontal scissor struts are connected with the joint of the main straight web members (9) and the horizontal straight rods (12) in a penetrating way; the side span truss (1) is characterized in that secondary diagonal web members (14) are connected between the upper end parts and the lower end parts of adjacent vertical face diagonal members (11) on two polygonal supporting frames, and the adjacent secondary diagonal web members (14) are symmetrically distributed about the commonly connected vertical face diagonal members (11).
5. The large span gradient polygonal cross section parallel truss roof as defined in claim 4, wherein: the end sealing pipes (19) are positioned on the outer side of the end face of the truss upright post (5), the end sealing pipes (19) are on the same plane with the horizontal straight rod (12) and are parallel to the horizontal straight rod (12), and the adjacent end sealing pipes (19) are on the same horizontal line and are connected with each other; a polygonal frame is arranged between the end sealing pipe (19) and the planes of the upper chord main rod (7), the lower chord main rod (6) and the waist rod (8).
6. The large span gradient polygonal cross section parallel truss roof as defined in claim 5, wherein: the polygonal frame is a hexagonal plane frame and is symmetrically arranged about the truss upright post (5); the polygonal frame is connected with the end of the end sealing pipe (19) and the end of the horizontal straight rod (12) on the truss upright post (5) through the waist rod (8); the upper connecting point of the connecting part of the polygonal frame and the waist bar (8) is connected with the upper end part of the truss upright post (5) through a connecting rod, and the lower connecting point of the connecting part of the polygonal frame and the waist bar (8) is connected with the lower end part of the truss upright post (5) through a connecting rod.
7. A construction method of a large-span gradual-change polygonal section parallel truss roof according to any one of claims 1 to 6, characterized by comprising the following specific steps:
step one, building a space truss jig frame and installing truss upright posts (5) at two ends;
step two, positioning and installing an upper chord main rod (7) and a lower chord main rod (6) according to the position of the space truss, and then installing and connecting an upper chord secondary rod (20) and a lower chord secondary rod (21) in the middle of the upper chord main rod (7) and the lower chord main rod (6);
correcting and adjusting the positions of the installed rod members, marking the positions of the main straight web members (9) on the upper chord main rod (7) and the lower chord main rod (6), and then sequentially installing the main straight web members (9) and the main inclined web members (10);
erecting a waist bar (8), installing a horizontal straight bar (12) and connecting with the main straight web bar (9), and accurately positioning and measuring the position of the waist bar (8);
step five, installing vertical face inclined bars (11) between the upper chord main bar (7), the lower chord main bar (6) and the waist bars (8), installing horizontal inclined bars (13) and scissor struts corresponding to the side span truss (1) and the middle span truss (2), and installing a last inclined web member (14) on the side span truss (1);
installing an end sealing pipe at the outer side of the end of the truss main body, positioning and connecting the end sealing pipe with the upper chord main rod (7) and the lower chord main rod (6), and connecting and fixing the end sealing pipe with the upper chord main rod and the lower chord main rod by using a connecting rod;
step seven, respectively completing the main body manufacturing of the side span truss (1) and the middle span truss (2) by the step one to the step six, and then respectively arranging the side span truss (1) and the middle span truss (2) according to the design;
and step eight, connecting a horizontal connecting rod (3) and an inclined connecting rod (4) among the two side span trusses (1), the side span trusses (1) and the middle span trusses (2) and the waist bars (8) at two sides among the middle span trusses (2), so as to finish the manufacturing of the truss roof.
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| CN204357003U (en) * | 2014-12-12 | 2015-05-27 | 苏州工业园区设计研究院股份有限公司 | Fish-bellied type large span open-web truss structure |
| CN108331164A (en) * | 2018-04-17 | 2018-07-27 | 南昌大学 | A kind of attachment device and installation method of Steel Truss Beam and lattice type steel column node |
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| CA2568777A1 (en) * | 2005-11-23 | 2007-05-23 | Waldemar H. Greiner | A truss and purlin support apparatus and a method of making and using same with building supports and floor and roof sheathing |
| US20080178555A1 (en) * | 2007-01-26 | 2008-07-31 | C. Green & Sons, Inc. | Tapered truss |
| US9249565B2 (en) * | 2011-12-07 | 2016-02-02 | Cpi Technologies, Llc | Deployable truss with orthogonally-hinged primary chords |
| CN104695341B (en) * | 2015-03-08 | 2017-01-11 | 北京工业大学 | Non-self-balanced beam string structure for reinforcing large-span continuous beam bridge |
| CN105625578B (en) * | 2016-02-05 | 2017-09-12 | 中国航空规划设计研究总院有限公司 | It is adapted to the huge prestressing force beam string structure and construction method of the closing of super-span coal yard |
| JP6340149B1 (en) * | 2018-02-26 | 2018-06-06 | 新日鉄住金エンジニアリング株式会社 | Stringed beam structure and its design method |
| CN209443661U (en) * | 2018-12-10 | 2019-09-27 | 中建二局安装工程有限公司 | A kind of parallel trussed roof of large span gradual change polygonal cross-section |
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| CN108331164A (en) * | 2018-04-17 | 2018-07-27 | 南昌大学 | A kind of attachment device and installation method of Steel Truss Beam and lattice type steel column node |
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