CN113123469A - Method for constructing complex curved surface modeling roof grid structure - Google Patents
Method for constructing complex curved surface modeling roof grid structure Download PDFInfo
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- CN113123469A CN113123469A CN202110312186.4A CN202110312186A CN113123469A CN 113123469 A CN113123469 A CN 113123469A CN 202110312186 A CN202110312186 A CN 202110312186A CN 113123469 A CN113123469 A CN 113123469A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 80
- 239000010959 steel Substances 0.000 claims abstract description 80
- 238000003466 welding Methods 0.000 claims abstract description 41
- 238000010276 construction Methods 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 7
- 238000009434 installation Methods 0.000 claims description 16
- 230000000694 effects Effects 0.000 abstract description 3
- 238000009435 building construction Methods 0.000 abstract description 2
- 210000001503 joint Anatomy 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 210000002837 heart atrium Anatomy 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
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- 229910000679 solder Inorganic materials 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/35—Extraordinary methods of construction, e.g. lift-slab, jack-block
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B1/1903—Connecting nodes specially adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B1/1903—Connecting nodes specially adapted therefor
- E04B1/1906—Connecting nodes specially adapted therefor with central spherical, semispherical or polyhedral connecting element
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/35—Extraordinary methods of construction, e.g. lift-slab, jack-block
- E04B1/3511—Lift-slab; characterised by a purely vertical lifting of floors or roofs or parts thereof
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B7/00—Roofs; Roof construction with regard to insulation
- E04B7/08—Vaulted roofs
- E04B7/10—Shell structures, e.g. of hyperbolic-parabolic shape; Grid-like formations acting as shell structures; Folded structures
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B2001/1957—Details of connections between nodes and struts
- E04B2001/1972—Welded or glued connection
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/35—Extraordinary methods of construction, e.g. lift-slab, jack-block
- E04B2001/3577—Extraordinary methods of construction, e.g. lift-slab, jack-block prefabricating a building and moving it as a whole to the erection site
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- Architecture (AREA)
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- Structural Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention relates to the field of building construction, aims to solve the problems that the assembly operation of a steel net rack is complex and the quality and the effect of a finished product cannot be guaranteed in the prior art, and provides a method for constructing a net rack structure of a complex curved surface modeling roof, which comprises the following steps: the steel mesh frame is split and assembled, the assembling sequence is from far to near, and the steel mesh frame is symmetrically installed; in the process of hoisting the steel mesh frame, hoisting the mesh frame to a to-be-installed position by using a crane, arranging a temporary support frame in advance at the projection position of the mesh frame ball node, and positioning and paying off the temporary support frame to ensure that the elevation and the position of a lower welding ball arranged on a support frame steel pipe are accurate; the rod pieces between any two net rack units are connected through welding, and in the step, when the ball nodes between the net racks need to be welded, an adjustable support frame is arranged below the ball nodes to support the ball nodes. The invention has the advantages of safe construction, high efficiency and ensured quality.
Description
Technical Field
The invention relates to the field of building construction, in particular to a method for constructing a complex curved surface modeling roof grid structure.
Background
Because of the advantages of large span, reliable structure and light total mass, the steel structure net rack has more and more roof structures in the form adopted by domestic buildings, and the traditional net rack hoisting mainly comprises processes of sectional hoisting, high-altitude bulk loading and the like, but both the processes have certain defects. The net rack sectional hoisting is that a moulding bed is manufactured on a ground scattered assembly field according to the shape of a roof, temporary supports are arranged, a lower chord, a web member, an upper chord and mutual ball joints are connected one by one to form a hoisting unit whole, and hoisting machinery and a support are utilized to hoist and install. The method has the disadvantages that a steel pipe scaffold supporting platform needs to be erected, a formwork is fully paved on the top of the platform, and the enclosure guard rails are arranged, so that a large amount of steel pipes and wood are input, the cost is high, the site pressure is high, and the hoisting machinery occupies a large area and has long influence time; the high-altitude bulk method is directly jointed and assembled at high altitude, and has the defects of high construction difficulty, great potential safety hazard, difficult control of construction quality and low construction speed. Especially for the roof grid structure with complex curved surface modeling, the quality and the effect of the finished product are not easy to be ensured.
Disclosure of Invention
The invention aims to provide a complex curved surface modeling roof grid structure, which solves the problems that the assembly operation of a steel grid in the prior art is complex and the quality and the effect of a finished product cannot be guaranteed.
The embodiment of the invention is realized by the following steps:
a method for constructing a complex curved surface modeling roof grid structure is characterized in that the grid structure is a free hyperboloid grid and is a roof grid consisting of a plurality of steel grids, each steel grid is formed by splicing a plurality of quadrangular pyramid units consisting of upper chord members, web members and lower chord members, and all the members are connected through welding balls; the welding balls are divided into upper welding balls and lower welding balls, the upper welding balls are connected with the web members and the upper chord members, and the lower welding balls are connected with the web members and the lower chord members;
the construction method comprises the following steps:
the steel mesh frame is split and assembled, the assembling sequence is from far to near, and the steel mesh frame is symmetrically installed;
in the steel truss hoist and mount process, suspend the net rack unit through the crane and stagnate empty, the net rack construction is carried out to the mode of artifical assistance-localization real-time installation, promptly: hoisting the net rack to a to-be-installed position by using a crane, arranging a temporary support frame in advance at the projection position of the net rack ball node, and ensuring the elevation and the position of a lower welding ball arranged on a support frame steel pipe to be accurate through positioning and paying off the temporary support frame; two workers are borne on the platform of the temporary support and are matched with the crawler crane to adjust and fix the position of the net rack;
the rod pieces between any two net rack units are connected by welding, and in the step, when the ball nodes between the net racks need to be welded, an adjustable support frame is arranged below the ball nodes to support the ball nodes;
and repeating the installation until the hoisting and positioning of the last net rack are completed, namely completing the construction of the whole steel net rack.
In one embodiment:
when each steel net frame is manufactured, selecting a proper place and position as an assembling place, and arranging a jig frame according to the net frame shape and the structural design; the setting method of the jig frame comprises the following steps:
planning a single assembly field, which can meet the integral assembly of two small hoisting units or the assembly of one large hoisting unit;
the assembly field is tamped to the field in advance, a steel plate is fully paved to serve as a bed jig bottom plate, profile steel is combined to form a supporting base, the nodes are lofted to support coordinates, welding balls of the nodes are fixed, rod pieces are connected among the welding balls to form steel net racks serving as net rack hoisting units.
In one embodiment:
the bed-jig bottom plate is made of steel plates with the thickness of more than 20cm, and the supporting base is formed by welding I-shaped steel; and the welding balls are supported at the required height through the supporting structures with the set heights.
In one embodiment:
the supporting structure comprises an embedded steel plate, and the embedded steel plate is fixed on the supporting base through embedded ribs welded below the embedded steel plate;
an adjustable seat is arranged on the embedded steel plate, a support column is arranged on the adjustable seat, and the welding ball is supported at the top of the support column; the adjustable seat comprises a fixed part at the lower part and a movable part which is in ball joint with the fixed part, and the support is connected with the movable part, so that the movable part and the support thereon can rotate relative to the fixed part to adjust the supporting angle.
In one embodiment:
the method for assembling the net rack hoisting unit on the ground comprises the following steps:
1) paying off and inspecting; placing a lower chord node base plate; completing the installation and positioning of 4 lower chord bolt ball nodes and lower chords among the nodes, so that the lower chords are in a square shape;
2) continuously installing a lower chord bolt ball and a lower chord, and connecting 7 lower chords into a 'ri' shape;
3) installing an upper chord bolt ball joint and a web member; connecting the upper bolt ball with the web member to form a regular rectangular pyramid;
4) and (5) repeating the steps 2) and 3), connecting the upper chord and the bolt ball joint, and installing the steel net rack.
In one embodiment:
the steel net frame is assembled on the jig frame by adopting a horizontal station, when the net frame is lifted, the lengths of 4 hoisting point steel wire ropes are adjusted according to the positions of the lifting lugs, so that the 4 hoisting points on the jig frame can be lifted basically and simultaneously under stress, the net frame member is kept stable when being separated from the jig frame, and after the member is integrally separated from the jig frame, the minimum distance between the net frame member and the ground is kept to be not more than 30 cm;
when the component is lifted by 30cm by using the arranged adjusting hoist, the hoist is adjusted to form a certain angle on the component, and meanwhile, the minimum distance between the steel net rack and the ground is kept not to exceed 30 cm; and finally, adjusting the hoist to enable the net rack to form an attitude angle in place at last, and when the net rack is transferred to the position above the temporary support frame, accurately positioning and welding installation are carried out through manual assistance.
In one embodiment:
and a crawler crane is arranged in the plane of the roof net rack and is used for hoisting each steel net rack.
The embodiment has the following beneficial effects due to the adoption of the construction technical scheme:
1. the construction cost, the construction period, the construction safety, the convenient installation and operation and the combination of the actual conditions on site are comprehensively considered, an integral hoisting and integral lifting method is dispatched, and a combined assembling method of sectional hoisting and air butt joint is adopted, so that the high-altitude operation time is reduced, the auxiliary material cost is reduced, and the construction period is saved;
2. the crane is used for staying empty, so that the convenience of installation and operation is improved, the precise positioning is facilitated, the quality of finished products is improved, the unfavorable condition of erecting a large number of construction platforms is avoided, the operation can be flexibly carried out only by a small number of workers, the construction speed is high, and the occupied area is small;
drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings referred to in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings may be obtained from these drawings without inventive effort.
FIG. 1 is a top view of a steel lattice roof in an embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along line 1-1 of FIG. 1;
FIG. 3 is a cross-sectional view taken along line 2-2 of FIG. 1;
FIG. 4 is a schematic diagram of the steel grid segment splicing according to an embodiment of the present invention;
FIG. 5 is a schematic view of an assembled steel grid frame assembly according to an embodiment of the present invention;
FIG. 6 is a schematic view of a steel truss segment hoisting according to an embodiment of the present invention;
FIG. 7 is an enlarged view of an adjustable mount of an embodiment of the present invention.
Icon: 1-lower welding ball, 2-lower chord, 3-steel support, 4-web member, 5-upper welding ball, 6-upper chord, 7-jig, 8-Zhongting crawler crane, 9-northern crawler crane, 10-temporary support frame, 11-steel support embedded part, 12-stiffening rib and 13-support.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Examples
The embodiment provides a method for constructing a complex curved surface modeling roof truss structure, and particularly refers to fig. 1 to 7.
The net rack structure is a free hyperboloid net rack and a roof net rack consisting of a plurality of steel net racks, each steel net rack is formed by splicing a plurality of quadrangular pyramid units consisting of upper chord members 6, web members 4 and lower chord members 2, and all the members are connected through welding balls; the welding ball is divided into an upper welding ball 5 and a lower welding ball 1, the upper welding ball is connected with the web member and the upper chord member, and the lower welding ball is connected with the web member and the lower chord member. The upper solder ball may be supported by a steel support 3.
The method for constructing the complex curved surface modeling roof truss structure in the embodiment comprises the following steps:
1. arranging crawler cranes in the plane of the roof steel net rack, wherein the hoisting capacity of cranes 8 distributed in the structural atrium open space is 320 tons, the hoisting capacity of cranes 9 on the north side and the hoisting capacity of cranes 9 on the south side are 300 tons, different cranes cover different areas, the net rack hoisting is mainly completed by an atrium crane, and the side zones on the north side and the south side are respectively hoisted by the cranes in the areas;
2. selecting a proper place and position as an assembling place, arranging a jig frame 7 according to the net rack shape and the structural design, and accurately positioning by means of instruments such as a total station instrument, a level instrument and the like to ensure that the assembled net rack is consistent with the actual position of a roof;
3. the steel net frame is divided into two parts and assembled into sections, the assembling sequence is comprehensively considered according to the axis, the position of a supporting point, the lifting capacity of a crane and the like, in the step, the heaviest part of the steel net frame is M30# (M is the code of the building net frame, 30# is the number, and the balance is the same), the lifting weight is 23.6 tons, the height is 15M, (the weight of the rest of the parts exceeds 23 tons, and the rest of the parts are installed in two parts), and the farthest lifting part of the M5# is 21.4 tons, and the height is 16M. The assembly sequence is in a symmetrical installation form from far to near;
4. in order to save the field, after the previous net rack is hoisted, the next net rack is assembled, the construction methods of different areas are the same, in order to ensure the stress safety and accurate positioning of the net rack, the first net rack starts from a support at a symmetrical position, the support 13 is connected with a pre-buried rib 11 which is pre-buried in advance by welding, a steel pipe of the support is provided with a steel rib 12 to improve the rigidity, the reliability of the structure is ensured, and other net racks are sequentially hoisted and connected with the previous net rack into a whole;
5. because this engineering rack space span is great, for reducing the cost, improves the efficiency of construction, and zhongting crawler crane adopts great hoisting capacity crane, and the rack unit stagnates in the rack hoist and mount in-process, suspends in midair through the crane, and the rack construction is carried out to the mode of artifical supplementary location installation, promptly: the net rack is lifted to a mounting position by a crane, a temporary support frame 10 is arranged in advance at the projection position of the net rack ball joint, and the elevation and the position of the net rack lower chord ball arranged on the support frame steel pipe are ensured to be accurate through positioning and paying off of the support frame. Two workers can be borne on the platform of the temporary support to adjust and fix the position of the net rack by matching with the crawler crane;
6. the member between two arbitrary rack units is connected and is passed through welded joint, the workman can directly be in the operation on the passageway of setting up on the rack, also can go on ascending a height the frame, to when needing the ball joint between the welded rack in this step, set up an adjustable support frame under the ball joint, the support is by steel pipe scaffold, the top holds in the palm and the connection of platform steel sheet, bolt connection for shore and steel sheet platform, form removable supporting platform frame, set up the cylindrical support steel pipe of profile modeling on the platform steel sheet, be used for supporting the ball joint. The adjusting mechanism is fixed on the working platform, the horizontal position of the spherical node can be adjusted by adjusting the elevations of the four jacking supports and moving the position of the profiling support, so that the adjusting mechanism can be used as a supporting point when the net rack is installed, bear construction load and adjust the coordinate of the net rack spherical node;
7. and repeating the steps 4 and 5 until the hoisting and positioning of the last net rack are completed, namely completing the construction of the whole steel net rack. In the process, the total station is kept in real-time detection, and three to five cases are assembled and then subjected to full-range reinspection once, so that problems can be found and timely processed. After the whole assembly, one-time comprehensive inspection and measurement are carried out, so that any deviation and quality problems are avoided;
preferably, the specific method for setting the jig frame in the step 2 is as follows:
a single assembly site of 12 m x30 m is planned, and the integral assembly of two small hoisting units or the assembly of one large hoisting unit can be met. The assembly site is leveled and tamped in advance, steel plates with the thickness of more than 20mm are fully paved to serve as a jig frame plane, H250mm steel is combined to form a supporting base, lofting nodes support coordinates, fixed nodes are welded with balls in a spot mode, and then rod pieces are connected between the balls to form a net rack hoisting unit;
preferably, the method for assembling the net rack assembling units on the ground comprises the following steps:
1) paying off and inspecting; placing a lower chord node base plate; the installation and positioning of the 4 lower chord bolt ball nodes 1 and the lower chord 2 among the nodes are completed, so that the lower chord is in a 'mouth' shape;
2) continuously installing a lower chord bolt ball and a lower chord, and connecting 7 lower chords into a day;
3) installing an upper chord bolt ball joint 5 and a web member 4; connecting the upper bolt ball with the web member to form a regular rectangular pyramid;
4) repeating the processes 2) to 3), connecting the upper chord 6 with the bolt ball joint, and mounting the steel net rack.
Preferably, the specific method for supporting the temporary support frame in the hoisting of the net frame in the step 5 is as follows:
the support frame adopts lattice formula 10, and bottom surface size 1.5X1.5m highly confirms according to concrete position lofting, and the support frame is arranged in rack piecemeal butt joint mouth position, and the connection that the support frame relates is except that marking for bolted connection, all the other are the welding, and the leg size is not less than 8mm, and the support frame stand all falls on the frame roof beam with the lower part, and the support point that individually can not fall on the frame roof beam, the lower part will set up the conversion roof beam and carry out the conversion. The support frame is divided into 3 types according to different use heights, and each type is divided into a combination of standard sections of 3 meters and 4 meters. The type of the section H100 multiplied by 6 multiplied by 8 of the upright post is used for a support frame with the height within 10 meters, the type of the section H150 multiplied by 7 multiplied by 10 of the upright post is used for a support frame with the height of 10 meters to 15 meters, and the type of the section P180 multiplied by 6 of the upright post is used for a support frame with the height above 15 meters. The web members and the horizontal rods are supported by L75 multiplied by 5mm angle steel, and the connection is realized by M16 bolts. The material is Q235.
Preferably, the specific method for hoisting and positioning the net rack in the step 5 is as follows:
the net rack is assembled on the jig frame by adopting a horizontal station, when the net rack is lifted, the length of each lifting point steel wire rope of 4 is adjusted according to the position of a lifting lug, so that 4 lifting points on the frame can be lifted basically and simultaneously under stress, the net rack is kept stable when being separated from the jig frame, and after the whole frame is separated from the jig frame, the minimum distance between the net rack and the ground is kept to be not more than 30 cm. By utilizing the arranged regulating hoist (the specification of the regulating hoist in the project is 20t), when the component is lifted by 30cm, the 15 and 16 hoists are regulated, so that the component forms a certain angle, and meanwhile, the minimum distance between the net frame component and the ground is kept not to exceed 30 cm. And the adjustment is performed by analogy. And in the same way, the 14 and 15 hoists are finally adjusted, so that the net rack is finally formed into an attitude angle when in position, and when the net rack is transferred to the upper part of the temporary support frame, the net rack is accurately positioned and welded and installed through manual assistance. The welding quality is directly related to the overall performance of the grid structure, and meanwhile, the positioning of the rod piece meets the requirement of deformation coordination, so that the generation of internal stress is reduced.
According to the invention, a welded ball grid is adopted for roof design, the effective coverage area of the grid is 23000 square meters, the design height of the grid is 4m, the total weight is about 1853.2 tons, the installation height is 2 m-23.5 m, the longitudinal span of the grid is 168 x 102m, and the large-span steel structure grid splicing structure belongs to.
The embodiment has the following beneficial effects due to the adoption of the construction technical scheme:
1. the construction cost, the construction period, the construction safety, the convenient installation and operation and the combination of the actual conditions on site are comprehensively considered, an integral hoisting and integral lifting method is dispatched, and a combined assembling method of sectional hoisting and air butt joint is adopted, so that the high-altitude operation time is reduced, the auxiliary material cost is reduced, and the construction period is saved;
2. the crane is used for staying empty, so that the convenience of installation and operation is improved, the precise positioning is facilitated, the quality of finished products is improved, the unfavorable condition of erecting a large number of construction platforms is avoided, the operation can be flexibly carried out only by a small number of workers, the construction speed is high, and the occupied area is small;
the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for constructing a complex curved surface modeling roof grid structure is characterized by comprising the following steps:
the net rack structure is a free hyperboloid net rack and is a roof net rack consisting of a plurality of steel net racks, each steel net rack is formed by splicing a plurality of quadrangular pyramid units consisting of upper chord members, web members and lower chord members, and all the members are connected through welding balls; the welding balls are divided into upper welding balls and lower welding balls, the upper welding balls are connected with the web members and the upper chord members, and the lower welding balls are connected with the web members and the lower chord members;
the construction method comprises the following steps:
the steel mesh frame is split and assembled, the assembling sequence is from far to near, and the steel mesh frame is symmetrically installed;
in the steel truss hoist and mount process, suspend the net rack unit through the crane and stagnate empty, the net rack construction is carried out to the mode of artifical assistance-localization real-time installation, promptly: hoisting the net rack to a to-be-installed position by using a crane, arranging a temporary support frame in advance at the projection position of the net rack ball node, and ensuring the elevation and the position of a lower welding ball arranged on a support frame steel pipe to be accurate through positioning and paying off the temporary support frame; two workers are borne on the platform of the temporary support and are matched with the crawler crane to adjust and fix the position of the net rack;
the rod pieces between any two net rack units are connected by welding, and in the step, when the ball nodes between the net racks need to be welded, an adjustable support frame is arranged below the ball nodes to support the ball nodes;
and repeating the installation until the hoisting and positioning of the last net rack are completed, namely completing the construction of the whole steel net rack.
2. The method for constructing a complex curved surface modeling roof truss structure according to claim 1, wherein:
when each steel net frame is manufactured, selecting a proper place and position as an assembling place, and arranging a jig frame according to the net frame shape and the structural design; the setting method of the jig frame comprises the following steps:
planning a single assembly field, which can meet the integral assembly of two small hoisting units or the assembly of one large hoisting unit;
the assembly field is tamped to the field in advance, a steel plate is fully paved to serve as a bed jig bottom plate, profile steel is combined to form a supporting base, the nodes are lofted to support coordinates, welding balls of the nodes are fixed, rod pieces are connected among the welding balls to form steel net racks serving as net rack hoisting units.
3. The method for constructing a complex curved surface modeling roof truss structure according to claim 2, wherein:
the bed-jig bottom plate is made of steel plates with the thickness of more than 20cm, and the supporting base is formed by welding I-shaped steel; and the welding balls are supported at the required height through the supporting structures with the set heights.
4. The method for constructing a complex curved surface modeling roof truss structure according to claim 3, wherein:
the supporting structure comprises an embedded steel plate, and the embedded steel plate is fixed on the supporting base through embedded ribs welded below the embedded steel plate;
an adjustable seat is arranged on the embedded steel plate, a support column is arranged on the adjustable seat, and the welding ball is supported at the top of the support column; the adjustable seat comprises a fixed part at the lower part and a movable part which is in ball joint with the fixed part, and the support is connected with the movable part, so that the movable part and the support thereon can rotate relative to the fixed part to adjust the supporting angle.
5. The method for constructing a complex curved surface modeling roof truss structure according to claim 3, wherein:
the method for assembling the net rack hoisting unit on the ground comprises the following steps:
1) paying off and inspecting; placing a lower chord node base plate; completing the installation and positioning of 4 lower chord bolt ball nodes and lower chords among the nodes, so that the lower chords are in a square shape;
2) continuously installing a lower chord bolt ball and a lower chord, and connecting 7 lower chords into a 'ri' shape;
3) installing an upper chord bolt ball joint and a web member; connecting the upper bolt ball with the web member to form a regular rectangular pyramid;
4) and (5) repeating the steps 2) and 3), connecting the upper chord and the bolt ball joint, and installing the steel net rack.
6. The method for constructing a complex curved surface modeling roof truss structure according to claim 2, wherein:
the steel net frame is assembled on the jig frame by adopting a horizontal station, when the net frame is lifted, the lengths of 4 hoisting point steel wire ropes are adjusted according to the positions of the lifting lugs, so that the 4 hoisting points on the jig frame can be lifted basically and simultaneously under stress, the net frame member is kept stable when being separated from the jig frame, and after the member is integrally separated from the jig frame, the minimum distance between the net frame member and the ground is kept to be not more than 30 cm;
when the component is lifted by 30cm by using the arranged adjusting hoist, the hoist is adjusted to form a certain angle on the component, and meanwhile, the minimum distance between the steel net rack and the ground is kept not to exceed 30 cm; and finally, adjusting the hoist to enable the net rack to form an attitude angle in place at last, and when the net rack is transferred to the position above the temporary support frame, accurately positioning and welding installation are carried out through manual assistance.
7. The method for constructing a complex curved surface modeling roof truss structure according to claim 2, wherein:
and a crawler crane is arranged in the plane of the roof net rack and is used for hoisting each steel net rack.
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| CN114086669A (en) * | 2021-11-30 | 2022-02-25 | 中国五冶集团有限公司 | Large-scale space special-shaped curved surface steel net rack modular rapid construction method |
| CN114722472A (en) * | 2022-04-15 | 2022-07-08 | 中建科工集团有限公司 | Method for analyzing batch hoisting weight of steel members |
| CN114922435A (en) * | 2022-05-17 | 2022-08-19 | 山东电力工程咨询院有限公司 | Construction method of bolt-sphere joint net rack of garbage power station |
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| CN114722472A (en) * | 2022-04-15 | 2022-07-08 | 中建科工集团有限公司 | Method for analyzing batch hoisting weight of steel members |
| CN114922435A (en) * | 2022-05-17 | 2022-08-19 | 山东电力工程咨询院有限公司 | Construction method of bolt-sphere joint net rack of garbage power station |
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| CN115075383B (en) * | 2022-08-04 | 2024-04-26 | 上海市机械施工集团有限公司 | Assembling method and assembling bracket for grid structure |
| CN115404994A (en) * | 2022-10-21 | 2022-11-29 | 中建八局第二建设有限公司 | Construction method of irregular curve space three-dimensional truss system of super-large-span building |
| CN115788065A (en) * | 2022-11-30 | 2023-03-14 | 中铁四局集团建筑工程有限公司 | Steel net rack installation construction method |
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