CN116201235A - Construction method of large-span stiff steel truss structure - Google Patents
Construction method of large-span stiff steel truss structure Download PDFInfo
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- CN116201235A CN116201235A CN202310169241.8A CN202310169241A CN116201235A CN 116201235 A CN116201235 A CN 116201235A CN 202310169241 A CN202310169241 A CN 202310169241A CN 116201235 A CN116201235 A CN 116201235A
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- steel truss
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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
- E04B1/342—Structures covering a large free area, whether open-sided or not, e.g. hangars, halls
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
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Abstract
The invention discloses a construction method of a large-span stiff steel truss structure, which comprises the following steps: deep design of a stiffening steel structure; processing a stiffening steel structure; pre-assembling a stiffening steel structure; installing a stiffening steel column; installing a reinforced concrete floor supporting system; the lattice column is supported and installed; positioning, hoisting and welding truss sections; removing the lattice column support and erecting a rigid steel girder template support; sealing the steel beam templates and pouring concrete; the formwork is removed, the traditional high-altitude parts installation method is replaced by the truss sectional processing, temporary support and sectional hoisting method aiming at the stiff steel truss with large structure and heavy weight, and the effective installation of the components is realized by rationalized sectional and pre-assembled and matched with a lattice column support system, so that the difficult problem of high installation precision requirements of truss arch control and the like in the construction of a large-span stiff steel truss structure is solved, the excellent effect is obtained, the purposes of smooth structure and simple construction are really realized, and the popularization value is higher.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a construction method of a large-span stiff steel truss structure.
Background
Large-span buildings are buildings spanning a roof space of 30m or more, in some buildings, due to the requirement of functions, the large space is necessary and the middle of the building is not allowed to stand columns, such as buildings of public and industrial buildings of gymnasiums, theatres, exhibition halls, great halls, waiting machines, waiting ships, hall, etc., factory buildings of industrial buildings, hangars, other large warehouses, etc., and the roof structure of the large-span buildings mainly comprises: in recent years, with the development of urban construction and the progress of construction technology, large-span structures are increasingly used, and steel trusses are widely used as main bearing members particularly suitable for large-span structures.
In the construction process of the existing commercial complex building, due to the limitation of construction sites, when the steel truss with large span, large structure and large mass is constructed in a structural form, the traditional high-altitude scattered splicing method is only suitable for the grid frame with the bolt ball node type, and the overhanging construction method with few brackets is suitable for the adoption of the traditional high-altitude spare part installation method, the installation difficulty of the truss is high, and the installation efficiency is extremely low, so that the construction method suitable for the large-span stiff steel truss structure with large structure and large mass is required.
Disclosure of Invention
In order to overcome the defects of the center in the prior art, the invention provides a construction method of a large-span stiff steel truss structure, which replaces the traditional high-altitude part installation method by adopting a truss sectional machining, temporary supporting and sectional hoisting method, solves the difficulty in the construction of the large-span stiff steel truss structure, achieves excellent effect, and really achieves the purposes of smooth structure and simple construction.
In order to achieve the above object, the present invention provides a construction method of a large-span stiff steel truss structure, comprising the steps of:
constructing a three-dimensional model of the large-span stiff steel truss according to a construction drawing of the large-span stiff steel truss structure, and dividing the large-span stiff steel truss into a middle section and two side sections;
a processing diagram of the large-span stiff steel truss structure is led out, and processing and manufacturing of corresponding segmented inner components are carried out in a processing plant;
the large-span stiff steel truss members which are manufactured by processing are assembled in sections through pre-assembling jig frames;
after a basement roof and a concrete beam are cast in civil engineering, installing a stiffening steel column on the upper layer of the basement roof, and installing a roof concrete floor supporting system;
installing lattice column supports under the large-span rigid steel truss beams by utilizing a lower scaffold of a roof concrete floor support system;
hoisting the large-span rigid steel truss member in a sectional manner according to the sequence of the first two side sections and the second middle section;
after all the components are lifted, removing lattice column supports, erecting a formwork support template of the steel beam, and pouring steel structural concrete after the formwork is installed;
and after the pouring of the reinforced steel structure concrete is completed, removing the reinforced steel beam template supporting template.
Preferably, the lattice column supports the column tops along the height direction in a manner of column top tooling for placing the segmented truss.
Preferably, the lattice column supports are provided with diagonal support bars at both sides perpendicular to the height direction of the lattice column supports.
By adopting the technical scheme, the invention has the following beneficial effects:
1) The two-layer truss adopts a large-span H-shaped steel truss, secondary beams are arranged between the main trusses, the main trusses are connected with steel columns at two sides, and due to the fact that the size of the components is large and the site construction period and construction conditions are considered, the construction is carried out by adopting a factory prefabrication and sectional hanging method, and the problem that the truss arching control and other installation accuracy requirements are high is solved through reasonable sectional and pre-assembly.
2) The large-span member cannot be installed in place once in the construction process, the high-altitude assembly of the large-span member can be assisted through the arrangement of the supporting system, the structure is detached after being in place and fixed, and the lattice column supporting system is adopted, so that the installation and the positioning of the large-span and large-weight member are realized, the supporting assembly is realized, the convenience and the rapidness are realized, and the repeated utilization is realized.
3) The integral three-dimensional coordinates of the nodes of the segmented components are obtained through Tekla software, the installation and positioning of the trusses are realized by utilizing the total station, the positioning of the trusses is ensured to meet the requirement of camber through the pre-arching value, the segmented trusses on two sides of the trusses are installed preferentially, the segmented trusses in the middle are installed after the positioning is finished, the load changes of different components and different nodes are large during construction, temporary steel support is required to be designed for auxiliary installation, the reasonable installation sequence can ensure the reasonable stress of the installation of the components, namely the safety is ensured, and the precision is also greatly ensured
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a construction process flow diagram of the construction method of the large-span stiff steel truss structure of the invention.
FIG. 2 is a schematic diagram of a segment of a truss girder in a construction method of a large span stiff steel truss structure of the present invention.
FIG. 3 is a schematic view of the installation of an upper steel column in the construction method of the large span stiff steel truss structure of the present invention.
FIG. 4 is a diagram illustrating the use of BIM lattice support in the construction method of the large span stiff steel truss structure of the present invention.
FIG. 5 is a schematic view of the construction of a standard lattice column in the construction method of the large span stiff steel truss structure of the present invention.
FIG. 6 is a schematic view of the hoisting of the two end trusses in the construction method of the large span rigid steel truss structure of the present invention.
FIG. 7 is a schematic view of the hoisting of a middle truss in the construction method of the large-span stiff steel truss structure of the invention.
FIG. 8 is a schematic diagram of the removal of lattice columns in the method of construction of a large span stiff steel truss structure of the present invention.
FIG. 9 is a schematic diagram of the completion of a stiffening steel structure in the method of constructing a large span stiffening steel truss structure of the invention.
The reference numbers in the drawings correspond to the following:
1-a large span stiff steel truss; 2-stiffening steel columns; 21-steel column brackets; 3-segment one; 4-segmentation two; 5-segmentation three; 6-lattice column support; 60-standard lattice columns; 61-upper base; 62-a lower base; 63-round tube support; 64-lattice column inner rod pieces; 7-basement roof; 8-column top tooling; 9-corbels at the top of the steel column; 10-steel beam.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The invention aims at solving the technical problems that the traditional steel truss overhead spare part installation method is only suitable for the bolt ball node type net frame, and the overhanging construction method with few brackets is suitable for the large-span stiff steel truss with large structure and heavy weight, the installation difficulty angle cannot meet the installation requirement, the large-span stiff steel truss structure construction method is provided, the problems in the construction of the large-span stiff steel truss structure are solved through reasonable segmentation and pre-assembly, the installation and the positioning of the large-span and heavy weight members are realized, the supporting assembly is realized, the convenience and the rapidness are realized, the repeated utilization is realized, and the construction efficiency is greatly improved.
Referring to fig. 1 to 9, the invention provides a construction method of a large-span stiff steel truss structure, which comprises the following steps:
1) And (3) deep design of a stiffening steel structure:
according to the construction drawing of the large-span stiffness steel truss 1 structure, a three-dimensional model of the large-span stiffness steel truss 1 is constructed, and the large-span stiffness steel truss 1 is segmented into a middle part and two sides, and the large-span stiffness steel truss 1 comprises a first segment 3, a second segment 4 and a third segment 5, and the operation key points in deepening design include:
a. utilizing Tekla software to establish a three-dimensional model of the large-span stiffness steel truss 1 steel structure, and performing collision inspection with a concrete structure and optimizing collision points;
b. calculating structural strength, rigidity and stability, wherein the load comprises the dead weight of a steel beam, the dead weight of a concrete structure, the dead weight of a template and a supporting system, the construction live load and the like, reinforcing the corresponding section according to the calculation result, drawing a steel structure processing diagram, and determining the installation process;
c. and obtaining the three-dimensional coordinates of the nodes of the optimal segmented component according to the three-dimensional simulation, converting the overall three-dimensional coordinates into local three-dimensional coordinates when each segment is assembled, and taking the local three-dimensional coordinates as the basis of positioning and linear control of the nodes when the segments are assembled, so as to accurately control the linear shape of the truss structure.
2) Processing a stiffening steel structure:
the processing diagram of the large-span stiff steel truss 1 structure is exported, processing and manufacturing of corresponding first-segment 3, second-segment 4 and third-segment 5 inner components are carried out in a processing factory, and it is required to say that the manufacturing flow of the stiff steel structural components follows the sequence of lofting number material, cutting processing, correcting and forming, edge processing, hole making, end processing, assembling and pre-assembling of steel skeleton components, and the processing and manufacturing of professional manufacturers are specifically entrusted.
3) Pre-assembling a stiffening steel structure:
the method comprises the steps of assembling the components of the large-span stiff steel truss 1 which is manufactured by pre-assembling a jig frame, placing a first pre-assembled section on the pre-assembled jig frame during specific assembling, roughly determining the position of the first section and detecting the flatness of the first section according to the whole pre-assembled length and a pre-arched value during placing, sequentially placing all rods of a second section and a third section, and carrying out corresponding detection, adjustment and temporary fixing.
Preferably, during assembly, the geometric precision and the matching precision of a test assembly section are required to be comprehensively detected, if the out-of-tolerance phenomenon occurs, corresponding adjustment is required, the precision requirement of the camber of the whole pre-assembly length is detected through each characteristic point on the side plate surface, in addition, in order to facilitate positioning connection of trusses, a positioning installation line is drawn for each longitudinal interface of the sections and two groups of temporary matching connecting pieces are installed, meanwhile, all the rods are numbered, so that the sections are installed in a segmented mode, meanwhile, the sections are disassembled, rust removal coating is carried out on the segmented trusses, the constraint of the jig on the sections is removed before the pre-assembly inspection of the sections, the sections are in a free state, and the camber, the distortion, the port sizes among the sections and the matching condition are mainly inspected.
4) And (3) mounting a stiffening steel column:
and pouring a basement roof and a concrete beam in civil engineering profession, preferentially installing an upper layer steel column and finishing welding.
5) Installing a reinforced concrete floor supporting system:
the roof concrete floor support system was selected and installed by calculation.
6) And (3) lattice column support installation:
by using the lower scaffold of the concrete floor slab supporting system, installing a lattice column support 6, supporting and arranging the lattice column support under the truss girder, adopting a lattice column and column top tool 8 mode to lay the segmented truss, carrying out fine adjustment positioning according to the elevation and pre-arching value of the truss, arranging diagonal support pieces on two sides of the lattice column support 6 for adjusting and fixing the truss girder effect, as shown in figure 5, a standard lattice column 60 comprises an upper base 61, a lower base 62 which are arranged in parallel and a lattice column inner rod piece 64 which is vertically and fixedly connected between the upper base 61 and the lower base 62, meanwhile, round tube supports 63 are fixedly connected between the inner rod pieces 64 of the lattice columns, and it is to be noted that the inner rod pieces 64 of the lattice columns are connected with flange plates between standard lattice columns 60 through high-strength bolts, the standard lattice columns 60 are connected through M24 x 75mm and 8.8-level large hexagonal high-strength bolts, and the inner rod pieces 64 of the lattice columns are connected through M20 x 60 and 8.8-level large hexagonal high-strength bolts.
7) Truss sectional positioning, hoisting and welding:
according to the order segmentation hoist and mount large-span strength nature steel truss 1 component of preceding both sides section back intermediate section, hoist and mount, when installing both ends truss section, the below is connected fixedly with lattice column support 6, the last chord is connected with steel column top bracket 9, lower chord segmentation position is connected with steel column bracket 21 through the horse board, through fillet weld welding, this position is after the structure is accomplished and is carried out the major structure butt joint welding again, all do temporary fixation when installing the secondary web member between the truss, pay attention to the inspection truss and pre-rise the arch value during the installation, when installing intermediate section truss and secondary member, recheck installation deviation, recheck and require the back and carry out whole welding again.
8) Dismantling the lattice column support, and erecting a rigid steel beam template support:
and after all the trusses are installed, removing the lattice column supports 6 and the lower scaffold, wherein the lower chord member subsection positions are still not welded, and the formwork support of the stiffening steel beam 10 is required to be analyzed according to load calculation and analysis, so that the formwork support selection and the formwork reinforcement method analysis of the stiffening steel beam 10 are carried out.
9) And (3) sealing the steel beam template, and pouring concrete:
and after the template is installed, pouring the concrete with the stiffening steel structure, strictly controlling the slump and the vibrating process of the concrete in the process, ensuring the compactness of the concrete around the stiffening steel, and curing the concrete according to the standard requirements.
10 Template removal):
after the design strength is reached, the non-bearing templates are disassembled firstly, then the bearing templates are disassembled, the side templates are disassembled firstly, and finally the bottom templates are disassembled in sequence, and after the structure subsides stably, the lower chord member subsection positions are welded.
The specific process principle of the construction method of the large-span stiff steel truss structure comprises the following steps:
the method is characterized in that a truss sectional machining, temporary support and sectional hoisting method is adopted to replace a traditional high-altitude part installation method for a stiff steel truss with a large structure and heavy weight, the effective installation of components is realized through reasonable sectional and pre-assembled, the form and the geometric dimension of the truss are studied mainly, the node dimension is determined to ensure that a supporting system meets the requirement of safe construction, the load, the stability and the safety of a plurality of primary and secondary trusses of the bi-directional orthogonal steel truss are effectively controlled in construction, the difficulty in the construction of a large-span stiff steel truss structure is solved, the excellent effect is obtained, and the purposes of smooth structure and simple construction are really realized.
The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, and yet fall within the scope of the invention.
Claims (3)
1. The construction method of the large-span stiff steel truss structure is characterized by comprising the following steps of:
constructing a three-dimensional model of the large-span stiff steel truss according to a construction drawing of the large-span stiff steel truss structure, and dividing the large-span stiff steel truss into a middle section and two side sections;
a processing diagram of the large-span stiff steel truss structure is led out, and processing and manufacturing of corresponding segmented inner components are carried out in a processing plant;
the large-span stiff steel truss members which are manufactured by processing are assembled in sections through pre-assembling jig frames;
after a basement roof and a concrete beam are cast in civil engineering, installing a stiffening steel column on the upper layer of the basement roof, and installing a roof concrete floor supporting system;
installing lattice column supports under the large-span rigid steel truss beams by utilizing a lower scaffold of a roof concrete floor support system;
hoisting the large-span rigid steel truss member in a sectional manner according to the sequence of the first two side sections and the second middle section;
after all the components are lifted, removing lattice column supports, erecting a formwork support template of the steel beam, and pouring steel structural concrete after the formwork is installed;
and after the pouring of the reinforced steel structure concrete is completed, removing the reinforced steel beam template supporting template.
2. The method for constructing a large span rigid steel truss structure according to claim 1, wherein: the lattice column supports the column tops in the height direction and is used for placing the segmented truss in a column top tool mode.
3. The method for constructing a large span rigid steel truss structure according to claim 1, wherein: and oblique support rods are arranged on two sides of the lattice column support perpendicular to the height direction of the lattice column support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310169241.8A CN116201235A (en) | 2023-02-27 | 2023-02-27 | Construction method of large-span stiff steel truss structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310169241.8A CN116201235A (en) | 2023-02-27 | 2023-02-27 | Construction method of large-span stiff steel truss structure |
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| CN116201235A true CN116201235A (en) | 2023-06-02 |
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| CN202310169241.8A Pending CN116201235A (en) | 2023-02-27 | 2023-02-27 | Construction method of large-span stiff steel truss structure |
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