CN113789909A - Construction process of oversized fish-belly-spanning roof truss - Google Patents
Construction process of oversized fish-belly-spanning roof truss Download PDFInfo
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- 238000004140 cleaning Methods 0.000 claims description 7
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- 229910000831 Steel Inorganic materials 0.000 claims description 5
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- E—FIXED CONSTRUCTIONS
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- 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
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
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- E—FIXED CONSTRUCTIONS
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- 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
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Abstract
The invention discloses a construction process of an oversized fish-bellied-spanning roof truss, which comprises the following steps of assembling a jig frame; before welding, the appearance size of parts in each part is checked, and the appearance size is corrected if the appearance size is out of tolerance; the straight web members and the inclined web members are folded; manufacturing and folding the lower chord and the upper chord; manufacturing and folding the support nodes; finally, assembling and welding the lower chord, the support joint, the upper chord, the straight web member and the inclined web member; and (4) installing a welding stiffening plate and a connecting plate. The invention divides each part into parts, all the part plates are typeset and cut in a numerical control mode, and are cut by adopting numerical control plasma preferentially so as to reduce the deformation caused by cutting, the support nodes are assembled by adopting a positive integral assembly method, the manufacturing precision requirement of a single component is ensured to meet the requirement of on-site assembly and design, the connection and welding among the parts adopt different welding and groove modes according to the structural characteristics and the requirements of later installation and bearing, and the construction process is optimized.
Description
Technical Field
The invention belongs to the technical field of steel structure buildings, and particularly relates to a construction process of an oversized fish-bellied-spanning roof truss.
Background
The ground for the second-stage project construction of the national conference center is located in the north of the road of the big tun, east adjacent to the east Chen east road, west adjacent to the west Chen west road and north road of the big tun, and the ground passes through the main building body and is connected with the 15 # line Aussen park station of the subway. The building function is a convention and exhibition center and is mainly used for holding national affairs, government affairs and high-end international communication activities. The total building area of the project is about 40.9 ten thousand square meters, and the project is mainly divided into three layers above the ground and two layers below the ground (a local part is provided with an interlayer). The plane size of the underground part building is 456 m multiplied by 180 m, the total building area is about 15.3 ten thousand square, and the underground part building mainly has the functions of exhibition, garage and machine room; the ground building plane size is 456 m 144 m, the total building area is about 25.6 ten thousand square, and the main functions are exhibition center and supporting office logistics. The overall building height is 45 meters (ridge height is 52 meters).
The project roof of the national conference center adopts a large-span plane arc truss and cylindrical surface space latticed shell structure system. Because its span is great, current structure can't satisfy its requirement of construction, even have the truss structure of large-span in the current steel construction, nevertheless because its structural design is reasonable inadequately, can influence its security and stability of using, and because its span is great, its preparation and installation accuracy require highly be the difficult point and the key of processing of fish belly formula roof truss is striden to the super large in the work progress.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects, the invention aims to provide a construction process of an oversized fish-belly spanning type roof truss, which is characterized in that an upper chord, a lower chord, a straight web member, a diagonal web member, a bracket, a support node, a stiffening plate and the like are divided into parts, all the parts are typeset and cut in a numerical control mode, numerical control plasma is preferentially adopted for cutting, so that the deformation caused by cutting is reduced, and a positive-making integral assembly method is adopted for assembly according to the structural characteristics of the support node per se so as to ensure that the manufacturing precision requirement of a single component meets the requirements of on-site assembly and design; the connection and welding between each component adopt different welding and groove modes according to the structural characteristics and the later installation and bearing requirements, thereby optimizing the construction process and further improving the welding and construction quality.
The technical scheme is as follows: in order to achieve the purpose, the invention provides a construction process of an oversized fish-bellied-spanning roof truss, which comprises the following specific steps:
1): assembling a jig frame, wherein the jig frame needs to keep very strong rigidity, a gap needs to be controlled during assembling, and a jig frame template needs to be erected and assembled by adopting a special template for machining and planing;
2): before welding, the appearance size of parts in each part is checked, and the appearance size is corrected if the appearance size is out of tolerance;
3): the straight web members and the inclined web members are folded;
4): manufacturing and folding the lower chord and the upper chord;
5): manufacturing and folding the support nodes;
6): finally, assembling and welding the lower chord, the support joint, the upper chord, the straight web member and the diagonal web member, namely hoisting the lower chord on a pre-assembled assembly jig frame firstly, and performing precision control; hoisting the upper chord on a pre-assembled assembly jig frame, and performing precision control; secondly, hoisting the truss diagonal web members on a pre-assembled assembly jig frame, and performing precision control; finally, hoisting the truss straight web members on a pre-assembled assembly jig frame, and performing precision control;
7): and (3) installing the welding stiffening plate and the connecting plate, welding each part and the component by adopting a T-shaped welding seam form, welding the connected parts and the component in a T-shaped welding seam double-sided welding form, and when the operation space is less than 80mm, adopting a T-shaped welding seam single-sided groove form and adopting an assembly withdrawing method. The construction process of the oversized fish-belly-spanning type roof truss comprises the steps of dividing an upper chord, a lower chord, a straight web member, an inclined web member, a bracket, a support joint, a stiffening plate and the like into parts, wherein all the part plates are subjected to numerical control typesetting and cutting, and are preferably subjected to cutting by adopting numerical control plasma so as to reduce deformation caused by cutting.
According to the construction process of the oversized fish-belly spanning type roof truss, in the step 3), in the manufacturing process of the straight web members and the inclined web members, hot-rolled H-shaped steel is adopted for the straight web members and the inclined web members, the lengths of the straight web members and the inclined web members are guaranteed in the machining process, the tolerance of the web members is required to be-2 mm-3 mm, and meanwhile, the distance precision of bolt holes of webs of two ports is required to be controlled to be-1 mm to +1 mm.
The construction process of the oversized fish-belly spanning type roof truss comprises the following specific manufacturing methods of a lower chord and an upper chord in the step 4): 1): firstly, self-welding a lower chord and an upper chord by CP welding, and adopting full penetration welding in a node area and a position 600mm left and right, wherein the length tolerance of the upper chord (3) is required to be-4 mm-6 mm;
2): the bracket structure, the vertical bracket and the side brackets are folded by themselves and welded by partial penetration welding seams, and the grooves at the connecting parts are welded by two sides of a T-shaped welding seam;
3): the corner joint or butt joint of the H-shaped chord member flange plate and the framework in the upper chord and the transfer node adopts full penetration welding, the groove at the joint between the structures adopts a root cleaning welding mode, and when an included angle exists in the structures, the groove faces to the obtuse angle direction.
The construction process of the oversized fish-bellied-spanning roof truss is characterized in that in the step 5), the support joint is assembled by adopting a positive integral assembly method, and the specific manufacturing method is as follows: 1): firstly, combining the support nodes, namely adopting full penetration welding to perform self-folding welding on the H-shaped support, wherein the connecting groove of each part adopts a back gouging welding mode;
2): assembling and welding the support base plate and the H-shaped support, namely welding the support base plate and the H-shaped support by adopting full penetration welding, wherein a groove at the joint adopts a back gouging welding groove;
3): welding the vertical stiffening plate, wherein the corner joint between the vertical stiffening plate and the base plate of the support is welded and fixed in a full penetration manner, the connected groove is in a root cleaning welding groove form, the transverse stiffening plate and the web plate of the H-shaped support are welded and fixed in a T-shaped welding seam welding manner, and the connected groove is in a T-shaped welding seam double-sided welding manner;
4): installing and welding a horizontal stiffening plate, wherein full penetration welding is adopted between the horizontal stiffening plate and the flange plate and between the horizontal stiffening plate and the vertical stiffening plate of the H-shaped support, a groove at the joint adopts a backing plate welding mode, the horizontal stiffening plate and the web plate of the H-shaped support are welded and fixed in a T-shaped welding seam welding mode, and the connected groove adopts a T-shaped welding seam single-side groove mode;
5): the fillet joint between the upper chord plate in the upper chord and the outer side plate in the H-shaped support is welded completely, the connected groove is in a back gouging welding groove form, the fillet joint and the web plate in the H-shaped support are welded and fixed in a T-shaped welding seam mode, the groove is in a T-shaped welding seam double-sided groove form, the fillet joint welding between the fillet joint and the inner side plate in the H-shaped support is welded completely, and the groove is in a backing plate welding form;
6): the fillet weld between the upper chord web and the H-shaped support is fixed by T-shaped weld welding, and the groove form of the joint is a T-shaped weld double-sided welding form;
7): welding a through-long horizontal stiffening plate, wherein the through-long horizontal stiffening plate and the vertical stiffening plate are welded in a full penetration welding mode, a connecting groove is in a root cleaning welding groove mode, the through-long horizontal stiffening plate and the inner side plate and the outer side plate of the H-shaped support are in full penetration welding, the groove mode is in a backing plate welding groove mode, the through-long horizontal stiffening plate and the web plate of the H-shaped support are welded in a T-shaped welding seam mode, the groove mode is in a T-shaped welding seam single-side groove mode, and the grooves are all made towards the lower side;
8): and sealing the triangular space formed between the through horizontal stiffening plate and the H-shaped support as well as the upper chord plate by adopting a plate.
The invention relates to a construction process of an oversized fish-belly spanning type roof truss, which comprises the following steps: the ultra-large fish-bellied roof truss comprises a lower chord, a group of support nodes, an upper chord, a group of straight web members and a group of diagonal web members, wherein the support nodes are arranged at two ends of the lower chord, the upper chord is arranged above the lower chord, two ends of the upper chord are connected with the support nodes, the straight web members are vertically arranged between the lower chord and the upper chord, and the diagonal web members are arranged between the lower chord and the upper chord and between the two straight web members.
According to the construction process of the oversized fish-belly spanning type roof truss, the upper chord comprises an upper chord truss and a group of switching nodes, the switching nodes are arranged below the upper chord truss, and the upper parts of the straight web members and the inclined web members are connected with the switching nodes; the upper chord truss is an H-shaped truss and comprises an upper chord plate, a lower chord plate and an upper chord web plate, the upper chord plate and the lower chord plate are arranged oppositely, the upper chord web plate is arranged between the upper chord plate and the lower chord plate, and reinforcing components are arranged between the upper chord plate and the lower chord plate and positioned on two sides of the upper chord web plate; the switching node is the V font, and it includes a set of bracket structure, bracket structure symmetry sets up, and institute's bracket structure all includes first curb plate, second curb plate and a set of web, first curb plate and second curb plate set up relatively, the web is located between first curb plate and the second curb plate, just the web is kept away from and is connected through the arc backplate between one side of first curb plate and the second curb plate.
According to the construction process of the oversized fish-belly-spanning type roof truss, the support nodes comprise support base plates, H-shaped supports, vertical stiffening plates and horizontal stiffening plates, the H-shaped supports are arranged above the support base plates, the vertical stiffening plates are arranged on one sides of web plates of the H-shaped supports, and the horizontal stiffening plates are arranged on two sides of the vertical stiffening plates and connected with the H-shaped supports;
the support node also comprises a through-long horizontal stiffening plate, and the through-long horizontal stiffening plate is arranged at the top of the vertical stiffening plate and is connected with the H-shaped support;
the upper portion of H type support is the slope form setting, one side of H type support is located to the lower chord, the end of upper chord plate extends to on the H type support in the upper chord, and both mutually support, just form triangular space between logical long horizontal stiffening plate and H type support and the upper chord plate.
The ultra-large fish-belly-spanning roof truss comprises a lower chord, a lower chord bottom plate and a lower chord web plate, wherein the lower chord top plate and the lower chord bottom plate are arranged oppositely, and the lower chord web plate is vertically arranged between the lower chord top plate and the lower chord bottom plate.
The ultra-large fish-belly-spanning roof truss further comprises a lower chord stiffening plate in the lower chord, wherein the lower chord stiffening plate is arranged between the lower chord top plate and the lower chord bottom plate and arranged on two sides of the lower chord web plate.
The invention relates to an oversized fish-bellied-spanning roof truss, which is characterized in that: the lower chord is provided with a group of vertical brackets and side brackets, and the lower parts of the straight web members and the inclined web members are respectively connected with the corresponding vertical brackets and the side brackets.
The technical scheme shows that the invention has the following beneficial effects:
1. the construction process of the oversized fish-belly-spanning type roof truss comprises the steps of dividing an upper chord, a lower chord, a straight web member, an inclined web member, a bracket, a support joint, a stiffening plate and the like into parts, wherein all the part plates are subjected to numerical control typesetting and cutting, and are preferably subjected to cutting by adopting numerical control plasma so as to reduce deformation caused by cutting.
2. The jig frame assembly adopts a very strong rigid jig frame, so that the support, the truss and the manufacturing process can be effectively ensured not to be settled all the time, and meanwhile, the special template for machining and planing is erected and assembled, so that the assembly precision of the truss of the roof can be effectively improved.
3. The oversized fish-bellied-spanning roof truss is simple in structure and reasonable in design, the upper chord and the lower chord are connected through the support nodes to form a fish-bellied-like structure, the span of the roof truss is increased, and the straight web members and the inclined web members are arranged between the upper chord and the lower chord, so that the connection stability between the upper chord and the lower chord is greatly improved, the firmness of the whole roof truss structure is improved, and the use safety and stability of the roof truss are effectively improved.
4. The upper chord comprises an upper chord truss and a group of switching nodes, the switching nodes are V-shaped, and the structural stability of the upper chord truss is ensured by adopting a unique structural design, and meanwhile, the upper chord truss can be connected with the straight web members and the inclined web members simultaneously, so that the structure of the whole roof truss is optimized, and the construction requirement is better met.
5. According to the invention, the arrangement of the vertical stiffening plate, the horizontal stiffening plate and the through-long horizontal stiffening plate in the support joint greatly improves the firmness and stability of the structure.
6. The upper part of the H-shaped support is arranged in an inclined manner, so that the H-shaped support can be better matched with the upper chord, and the connection stability of the H-shaped support and the upper chord is improved.
Drawings
FIG. 1 is a schematic structural view of a super large fish-belly-spanning roof truss according to the present invention;
FIG. 2 is a schematic view of a partial installation of the lower chord of the present invention;
FIG. 3 is a schematic view of a partial installation of the lower chord, the support nodes and the upper chord of the present invention;
FIG. 4 is a schematic diagram of the installation of a transit node of the present invention;
fig. 5 is a schematic view of the installation of the vertical corbels and the side corbels in the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example 1
The construction process of the oversized fish-bellied-spanning roof truss in the embodiment comprises the following specific construction processes:
1): assembling a jig frame, wherein the jig frame needs to keep very strong rigidity, a gap needs to be controlled during assembling, and a jig frame template needs to be erected and assembled by adopting a special template for machining and planing;
2): before welding, the appearance size of parts in each part is checked, and the appearance size is corrected if the appearance size is out of tolerance;
3): the straight web members 4 and the inclined web members 5 are folded;
4): manufacturing and folding the lower chord 1 and the upper chord 3;
5): manufacturing and folding the support node 2;
6): finally, assembling and welding the lower chord 1, the support joint 2, the upper chord 3, the straight web member 4 and the diagonal web member 5, namely hoisting the lower chord 1 on a pre-assembled assembly jig frame to perform precision control; hoisting the upper chord 3 on a pre-assembled assembly jig frame for precision control; secondly, hoisting the truss diagonal web members 5 on a pre-assembled assembly jig frame for precision control; finally, hoisting the truss straight web members 4 on a pre-assembled assembly jig frame for precision control;
7): and (3) installing the welding stiffening plate and the connecting plate, welding each part and the component by adopting a T-shaped welding seam form, welding the connected parts and the component in a T-shaped welding seam double-sided welding form, and when the operation space is less than 80mm, adopting a T-shaped welding seam single-sided groove form and adopting an assembly withdrawing method.
In the construction process of the oversized fish-web-spanning roof truss in the embodiment, in the step 3, the straight web members 4 and the diagonal web members 5 are made of hot-rolled H-shaped steel, the lengths of the straight web members 4 and the diagonal web members 5 are ensured in the processing process, the tolerance of the web members is required to be-2 mm-3 mm, and meanwhile, the distance precision between bolt holes of two port webs needs to be controlled to be-1 mm to +1 mm.
In the construction process of the oversized fish-belly-spanning type roof truss in the embodiment, the specific manufacturing method of the lower chord 1 and the upper chord 3 in the step 4 is as follows: 1): firstly, self-welding a lower chord 1 and an upper chord 3 by CP welding, and adopting full penetration welding in a node area and a position 600mm left and right, wherein the length tolerance of the upper chord (3) is required to be-4 mm-6 mm;
2): the bracket structure, the vertical bracket 15 and the side bracket 16 are folded by themselves and welded by partial penetration welding seams, and the grooves at the connecting parts are welded by two sides of a T-shaped welding seam;
3): the corner joint or butt joint of the H-shaped chord member flange plate and the framework in the transfer joint 32 and the upper chord 3 adopts full penetration welding, the groove at the joint between the structures adopts a root clearing welding mode, and when an included angle exists in the structure, the groove faces an obtuse angle direction.
In the construction process of the oversized fish-bellied-spanning roof truss in the embodiment, in the step 5, the support nodes 2 are assembled by adopting a positive integral assembly method, and the specific manufacturing method is as follows: 1): firstly, combining the support nodes 2, namely adopting full penetration welding to perform self-folding welding on the H-shaped support 22, wherein the connecting groove of each part adopts a back gouging welding mode;
2): assembling and welding the support base plate 21 and the H-shaped support 22, namely welding the support base plate 21 and the H-shaped support 22 by adopting full penetration welding, wherein a groove at the joint adopts a back gouging welding groove;
3): installing and welding the vertical stiffening plate 23, wherein the corner joint between the vertical stiffening plate 23 and the support base plate 21 is fixed by full penetration welding, the connected groove is in a root cleaning welding groove form, the web plate of the horizontal stiffening plate 23 and the H-shaped support 22 are fixed by welding in a T-shaped welding seam welding mode, and the connected groove is in a T-shaped welding seam double-sided welding mode;
4): installing and welding a horizontal stiffening plate 24, adopting full penetration welding between the horizontal stiffening plate 24 and the flange plate of the H-shaped support 22 and the vertical stiffening plate 23, adopting a backing plate welding mode for a groove at a connecting part, adopting a T-shaped welding seam welding mode for welding and fixing between the horizontal stiffening plate 24 and the web plate of the H-shaped support 22, and adopting a T-shaped welding seam single-side groove mode for the connecting groove;
5): the fillet joint between the upper chord plate 311 in the upper chord 3 and the outer side plate in the H-shaped support 22 is fully penetration welded, the connected groove form adopts a back gouging groove, the fillet joint and the web plate in the H-shaped support 22 are welded and fixed in a T-shaped welding seam mode, the groove form adopts a T-shaped welding seam double-sided groove form, the fillet joint and the inner side plate in the H-shaped support 22 are fully penetration welded, and the groove form adopts a backing plate welding form;
6): the fillet weld between the upper chord web 313 and the H-shaped support 22 is fixed by T-shaped weld welding, and the groove form of the joint is a T-shaped weld double-sided welding form;
7): welding a through-long horizontal stiffening plate 25, welding the through-long horizontal stiffening plate 25 and the vertical stiffening plate 23 in a full penetration welding mode, welding a connecting groove in a root cleaning welding groove mode, welding the through-long horizontal stiffening plate 25 and the inner side plate and the outer side plate of the H-shaped support 22 in a full penetration welding mode, welding a backing plate welding groove mode in a groove mode, welding the through-long horizontal stiffening plate 25 and the web plate of the H-shaped support 22 in a T-shaped welding seam mode, welding the groove in a T-shaped welding seam single-side groove mode, and opening the groove towards the lower side;
8): the triangular space formed between the through horizontal stiffening plate 25 and the H-shaped support 22 and the upper chord 311 is sealed by using a plate.
Example 2
The oversized fish-bellied-spanning roof truss shown in fig. 1 to 5 comprises a lower chord 1, a group of support nodes 2, an upper chord 3, a group of straight web members 4 and a group of diagonal web members 5, wherein the support nodes 2 are arranged at two ends of the lower chord 1, the upper chord 3 is arranged above the lower chord 1, two ends of the upper chord 3 are connected with the support nodes 2, the straight web members 4 are vertically arranged between the lower chord 1 and the upper chord 3, and the diagonal web members 5 are arranged between the lower chord 1 and the upper chord 3 and between the two straight web members 4.
In the embodiment, the upper chord 3 comprises an upper chord truss 31 and a group of transit nodes 32, the transit nodes 32 are arranged below the upper chord truss 31, and the upper parts of the straight web members 4 and the inclined web members 5 are connected with the transit nodes 32; the upper chord truss 31 is an H-shaped truss and comprises an upper chord plate 311, a lower chord plate 312 and an upper chord web 313, the upper chord plate 311 and the lower chord plate 312 are oppositely arranged, the upper chord web 313 is arranged between the upper chord plate 311 and the lower chord plate 312, and reinforcing components 314 are arranged between the upper chord plate 311 and the lower chord plate 312 and positioned at two sides of the upper chord web 313; switching node 32 is the V font, and it includes a set of bracket structure, bracket structure symmetry sets up, and institute's bracket structure all includes first curb plate 321, second curb plate 322 and a set of web 323, first curb plate 321 and second curb plate 322 set up relatively, web 323 is located between first curb plate 321 and the second curb plate 322, just one side that first curb plate 321 was kept away from to web 323 is connected through arc backplate 324 between the second curb plate 322.
In the embodiment, the support node 2 comprises a support base plate 21, an H-shaped support 22, a vertical stiffening plate 23 and a horizontal stiffening plate 24, the H-shaped support 22 is arranged above the support base plate 21, the vertical stiffening plate 23 is arranged on one side of a web plate of the H-shaped support 22, and the horizontal stiffening plate 24 is arranged on two sides of the vertical stiffening plate 23 and connected with the H-shaped support 22;
the support node 2 further comprises a through-long horizontal stiffening plate 25, wherein the through-long horizontal stiffening plate 25 is arranged at the top of the vertical stiffening plate 23 and is connected with the H-shaped support 22;
the upper portion of H type support 22 is the slope form setting, the one side of H type support 22 is located to lower chord 1, the end of upper chord plate 311 extends to on the H type support 22 in the upper chord 3, and both mutually support, just form triangular space between logical long horizontal stiffening plate 25 and H type support 22 and the upper chord plate 311.
In this embodiment, the lower chord 1 includes a lower chord top plate 11, a lower chord bottom plate 12 and a lower chord web 13, the lower chord top plate 11 and the lower chord bottom plate 12 are oppositely disposed, and the lower chord web 13 is vertically disposed between the lower chord top plate 11 and the lower chord bottom plate 12.
In this embodiment, the lower chord 1 further includes a lower chord stiffening plate 14, and the lower chord stiffening plate 14 is disposed between the lower chord top plate 11 and the lower chord bottom plate 12 and disposed on two sides of the lower chord web 13.
In this embodiment, the lower chord 1 is provided with a group of vertical brackets 15 and side brackets 16, and the lower parts of the straight web members 4 and the diagonal web members 5 are respectively connected with the corresponding vertical brackets 15 and side brackets 16.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (10)
1. The utility model provides a construction technology of fish belly formula roof truss is striden to super large which characterized in that: the specific construction process is as follows:
1): assembling a jig frame, wherein the jig frame needs to keep very strong rigidity, a gap needs to be controlled during assembling, and a jig frame template needs to be erected and assembled by adopting a special template for machining and planing;
2): before welding, the appearance size of parts in each part is checked, and the appearance size is corrected if the appearance size is out of tolerance;
3): the straight web member (4) and the inclined web member (5) are folded;
4): the lower chord (1) and the upper chord (3) are manufactured and folded;
5): manufacturing and folding the support node (2);
6): finally, assembling and welding the lower chord (1), the support joint (2), the upper chord (3), the straight web member (4) and the diagonal web member (5), namely hoisting the lower chord (1) on a pre-assembled assembly jig frame to perform precision control; hoisting the upper chord (3) on a pre-assembled assembly jig frame for precision control; secondly, hoisting the truss diagonal web members (5) on a pre-assembled assembly jig frame for precision control; finally, hoisting the truss straight web members (4) on a pre-assembled assembly jig frame for precision control;
7): and (3) installing the welding stiffening plate and the connecting plate, welding each part and the component by adopting a T-shaped welding seam form, welding the connected parts and the component in a T-shaped welding seam double-sided welding form, and when the operation space is less than 80mm, adopting a T-shaped welding seam single-sided groove form and adopting an assembly withdrawing method.
2. The construction process of the oversized fish-web-spanning roof truss according to claim 1, wherein in the step 3), the straight web members (4) and the diagonal web members (5) are made of hot-rolled H-shaped steel, the length of the straight web members (4) and the length of the diagonal web members (5) are ensured in the machining process, the tolerance of the web members is required to be-2 mm-3 mm, and meanwhile, the distance precision between bolt holes of two port webs is required to be controlled to be-1 mm- +1 mm.
3. The construction process of the oversized fish-bellied-spanning roof truss according to claim 1, wherein the specific manufacturing method of the lower chord (1) and the upper chord (3) in the step 4) is as follows: 1): firstly, self-welding a lower chord (1) and an upper chord (3) by CP welding, and full penetration welding is adopted in a node area and positions 600mm left and right, and the length tolerance of the upper chord (3) is required to be-4 mm-6 mm;
2): the bracket structure, the vertical bracket (15) and the side bracket (16) are folded by themselves and welded by partial penetration welding seams, and the groove at the joint is welded by two sides of a T-shaped welding seam;
3): the corner joint or butt joint of the H-shaped chord member flange plate and the framework in the transfer joint (32) and the upper chord (3) adopts full penetration welding, the groove at the joint between the structures adopts a root clearing welding mode, and when an included angle exists in the structures, the groove faces an obtuse angle direction.
4. The construction process of the oversized fish-bellied-spanning roof truss according to claim 1, wherein in the step 5), the support joint (2) adopts a positive integral assembly method, and the specific manufacturing method is as follows: 1): firstly, combining the support nodes (2), namely performing self-folding welding on the H-shaped support (22) by adopting full penetration welding, wherein the connecting groove of each part adopts a back gouging welding mode;
2): assembling and welding the support base plate (21) and the H-shaped support (22), namely welding the support base plate (21) and the H-shaped support (22) by adopting full penetration welding, and adopting a back gouging welding groove at a joint;
3): welding the vertical stiffening plate (23), wherein the corner joint between the vertical stiffening plate (23) and the support base plate (21) is welded and fixed in a full penetration mode, the connected groove is in a root cleaning welding groove form, the web plate of the H-shaped support (22) and the directional stiffening plate (23) are welded and fixed in a T-shaped welding seam welding mode, and the connected groove is in a T-shaped welding seam double-side welding mode;
4): welding a horizontal stiffening plate (24), wherein full penetration welding is adopted between the horizontal stiffening plate (24) and a flange plate and a vertical stiffening plate (23) of an H-shaped support (22), a groove at the joint adopts a backing plate welding mode, the horizontal stiffening plate (24) and a web plate of the H-shaped support (22) are welded and fixed in a T-shaped welding seam welding mode, and the connected groove adopts a T-shaped welding seam single-side groove mode;
5): the fillet joint between the upper chord plate (311) in the upper chord (3) and the outer side plate in the H-shaped support (22) is welded completely, the connected groove form adopts a back gouging welding groove, the fillet joint and the web plate in the H-shaped support (22) are welded and fixed in a T-shaped welding mode, the groove form adopts a T-shaped welding seam double-sided groove form, the fillet joint and the inner side plate in the H-shaped support (22) are welded completely, and the groove form adopts a backing plate welding form;
6): the fillet weld between the upper chord web (313) and the H-shaped support (22) is fixed by T-shaped weld welding, and the groove form of the joint is a T-shaped weld double-sided welding form;
7): welding a through-long horizontal stiffening plate (25), welding the through-long horizontal stiffening plate (25) and a vertical stiffening plate (23) in a full penetration welding mode, welding a connecting groove in a root cleaning welding groove mode, welding the through-long horizontal stiffening plate (25) and inner and outer side plates of an H-shaped support (22) in a full penetration welding mode, welding a backing plate welding groove in a groove mode, welding the through-long horizontal stiffening plate (25) and a web plate of the H-shaped support (22) in a T-shaped welding seam mode, welding the groove in a T-shaped welding seam single-side groove mode, and opening the groove towards the lower side;
8): and sealing the triangular space formed between the through horizontal stiffening plate (25) and the H-shaped support (22) and the upper chord plate (311) by using a plate.
5. The construction process of the oversized fish-bellied-spanning roof truss according to any one of claims 1 to 4, wherein the construction process comprises the following steps: the method comprises the following steps: the fish belly formula roof truss is striden to super large, fish belly formula roof truss is striden to super large includes lower chord (1), a set of support node (2), last chord (3), a set of straight web member (4) and a set of diagonal web member (5), the both ends of lower chord (1) are located in support node (2), the top of lower chord (1) is located in last chord (3), and its both ends are connected with support node (2), between lower chord (1) and last chord (3) are located perpendicularly in straight web member (4), diagonal web member (5) are located between lower chord (1) and last chord (3) to locate between two straight web members (4).
6. The construction process of the oversized fish-bellied-spanning roof truss according to claim 1, which is characterized in that: the upper chord (3) comprises an upper chord truss (31) and a group of switching nodes (32), the switching nodes (32) are arranged below the upper chord truss (31), and the upper parts of the straight web members (4) and the inclined web members (5) are connected with the switching nodes (32); the upper chord truss (31) is an H-shaped truss and comprises an upper chord plate (311), a lower chord plate (312) and an upper chord web plate (313), the upper chord plate (311) and the lower chord plate (312) are oppositely arranged, the upper chord web plate (313) is arranged between the upper chord plate (311) and the lower chord plate (312), and reinforcing components (314) are arranged between the upper chord plate (311) and the lower chord plate (312) and positioned at two sides of the upper chord web plate (313); switching node (32) are the V font, and it includes a set of bracket structure, bracket structure symmetry sets up, and institute's bracket structure all includes first curb plate (321), second curb plate (322) and a set of web (323), first curb plate (321) and second curb plate (322) set up relatively, web (323) are located between first curb plate (321) and second curb plate (322), just web (323) are kept away from and are connected through arc backplate (324) between one side of first curb plate (321) and second curb plate (322).
7. The construction process of the oversized fish-bellied-spanning roof truss according to claim 2, which is characterized in that: the support node (2) comprises a support base plate (21), an H-shaped support (22), a vertical stiffening plate (23) and a horizontal stiffening plate (24), the H-shaped support (22) is arranged above the support base plate (21), the vertical stiffening plate (23) is arranged on one side of a web plate of the H-shaped support (22), and the horizontal stiffening plate (24) is arranged on two sides of the vertical stiffening plate (23) and connected with the H-shaped support (22);
the support node (2) further comprises a through-long horizontal stiffening plate (25), and the through-long horizontal stiffening plate (25) is arranged at the top of the vertical stiffening plate (23) and connected with the H-shaped support (22);
the upper portion of H type support (22) is the slope form and sets up, one side of H type support (22) is located in lower chord (1), last chord (3) in the end of upper chord plate (311) extend to on H type support (22), and both mutually support, just form triangular space between logical long horizontal stiffening plate (25) and H type support (22) and upper chord plate (311).
8. The oversized fish-bellied roof truss of claim 3, wherein: the lower chord (1) comprises a lower chord top plate (11), a lower chord bottom plate (12) and a lower chord web plate (13), the lower chord top plate (11) and the lower chord bottom plate (12) are arranged oppositely, and the lower chord web plate (13) is vertically arranged between the lower chord top plate (11) and the lower chord bottom plate (12).
9. The oversized fish-bellied roof truss of claim 4, wherein: the lower chord (1) further comprises a lower chord stiffening plate (14), and the lower chord stiffening plate (14) is arranged between the lower chord top plate (11) and the lower chord bottom plate (12) and arranged on two sides of the lower chord web plate (13).
10. The oversized fish-bellied roof truss of claim 5, wherein: be equipped with a set of vertical bracket (15) and side bracket (16) on last quarter (1), the lower part of straight web member (4) and oblique web member (5) is connected with vertical bracket (15) and side bracket (16) that correspond respectively.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114211189A (en) * | 2021-12-30 | 2022-03-22 | 武汉武船重型装备工程有限责任公司 | Method for machining high-precision inner molded surface |
| CN114892873A (en) * | 2022-05-07 | 2022-08-12 | 中建八局第二建设有限公司 | Hoisting construction method for fish-bellied truss of inclined roof |
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| CN105478961A (en) * | 2015-12-31 | 2016-04-13 | 浙江盛达铁塔有限公司 | T-shaped welding method |
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| FR2593536A1 (en) * | 1986-01-27 | 1987-07-31 | Bouygues Sa | Structures made of reinforced concrete and steel, especially for making girders and, in particular, girders to be used as purlins |
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| CN114892873A (en) * | 2022-05-07 | 2022-08-12 | 中建八局第二建设有限公司 | Hoisting construction method for fish-bellied truss of inclined roof |
| CN114892873B (en) * | 2022-05-07 | 2024-04-19 | 中建八局第二建设有限公司 | Inclined roof fish-bellied truss hoisting construction method |
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