CN117328683A - Construction method of large-span, ultrahigh and heavy roof steel structure - Google Patents
Construction method of large-span, ultrahigh and heavy roof steel structure Download PDFInfo
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- CN117328683A CN117328683A CN202311508521.3A CN202311508521A CN117328683A CN 117328683 A CN117328683 A CN 117328683A CN 202311508521 A CN202311508521 A CN 202311508521A CN 117328683 A CN117328683 A CN 117328683A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 165
- 239000010959 steel Substances 0.000 title claims abstract description 165
- 238000010276 construction Methods 0.000 title claims abstract description 103
- 238000003466 welding Methods 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 35
- 238000013461 design Methods 0.000 claims abstract description 28
- 238000009434 installation Methods 0.000 claims abstract description 12
- 238000010586 diagram Methods 0.000 claims abstract description 11
- 238000009413 insulation Methods 0.000 claims abstract description 11
- 238000005536 corrosion prevention Methods 0.000 claims abstract description 10
- 238000012163 sequencing technique Methods 0.000 claims abstract description 10
- 238000004458 analytical method Methods 0.000 claims abstract description 5
- 239000003973 paint Substances 0.000 claims description 18
- 239000011248 coating agent Substances 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 10
- 238000005260 corrosion Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000004422 calculation algorithm Methods 0.000 claims description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
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- 230000001680 brushing effect Effects 0.000 claims description 3
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- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000037452 priming Effects 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000011179 visual inspection Methods 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 2
- 239000011232 storage material Substances 0.000 claims description 2
- 238000009417 prefabrication Methods 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
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- 238000007689 inspection Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
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Classifications
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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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- 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
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention provides a construction method of a large-span, ultrahigh and heavy roof steel structure, which belongs to the technical field of steel structure construction and comprises the following steps of steel prefabrication: prefabricated steel components including columns, beams, scaffolds; and (3) construction drawing analysis: utilizing a node diagram model, and defining main nodes and key steps in the construction process according to a construction drawing; and (3) field arrangement: according to the construction drawing and the construction conditions, the construction site is arranged; and (3) steel structure installation: installing a steel structure according to a construction drawing; welding and bolting: welding and bolting the steel structure; and (3) steel structure adjustment: adjusting the installed steel structure to ensure that the steel structure meets the design requirement; corrosion prevention and insulation of steel structure: and finishing the corrosion prevention and insulation treatment of the steel structure. The method solves the technical problems that the prior art usually carries out sequencing in a manual experience mode, and the main nodes and key steps are not considered in the sequencing process.
Description
Technical Field
The invention belongs to the technical field of steel structure construction, and particularly relates to a construction method of a large-span, ultrahigh and heavy roof steel structure.
Background
With the development of social economy, large-span, ultrahigh and heavy roof steel structure buildings such as large-scale stadiums, exhibition halls and warehouse houses are more and more, and the steel structure dead weight of the steel structure is very large because the steel structure is usually large in span and high in storey height. The steel structure has larger construction difficulty, and if the construction is improper, structural safety accidents are very easy to occur. Therefore, how to ensure the safety and quality of the construction of the steel structure of the large-span, ultrahigh and heavy roof is a problem to be solved in the building industry.
At present, the design theory and the calculation method of the large-span roof steel structure building in China are mature, but the corresponding construction technology and quality control means are weak. Firstly, a construction scheme of a system is lacked, and part of units are constructed empirically; secondly, the hoisting scheme aiming at the ultra-high and heavy steel structures is lacking, and potential safety hazards exist; thirdly, lack of standardized control of welding, adjusting and other processes, and uneven quality; fourth, there is a lack of effective means for detecting node quality. These problems can lead to engineering accidents and also make many excellent designs not very well convertible into high quality buildings.
Aiming at the construction problem of the large-span roof steel structure, students at home and abroad conduct some researches. Li Jiang and other students establish a three-dimensional simulation system for steel structure construction through a visualization technology, and the three-dimensional simulation system is used for guiding the construction; and the BIM technology is adopted to realize cooperative modeling and conflict detection of the steel structure parts. The methods provide a new technical means for steel structure construction.
When the steel structure of the large-span, ultrahigh and heavy roof is constructed, the steel sequence of the construction needs to be selected, the prior art usually sorts the steel by a manual experience mode, and in the sorting process, the main nodes and key steps are not considered.
Disclosure of Invention
In view of the above, the invention provides a construction method of a large-span, ultrahigh and heavy roof steel structure, which solves the technical problems that the prior art usually carries out sequencing in a manual experience mode, and the consideration of main nodes and key steps is lacking in the sequencing process.
The invention is realized in the following way:
the invention provides a construction method of a large-span, ultrahigh and heavy roof steel structure, which comprises the following steps:
s10, prefabricating steel: prefabricated steel components including columns, beams, scaffolds;
s20, construction drawing analysis: utilizing a node diagram model, and defining main nodes and key steps in the construction process according to a construction drawing;
s30, field arrangement: according to the construction drawing and the construction conditions, the construction site is arranged;
s40, steel structure installation: installing a steel structure according to a construction drawing;
s50, welding and bolting: welding and bolting the steel structure;
s60, steel structure adjustment: adjusting the installed steel structure to ensure that the steel structure meets the design requirement;
s70, corrosion prevention and insulation of the steel structure: and finishing the corrosion prevention and insulation treatment of the steel structure.
On the basis of the technical scheme, the construction method of the large-span, ultrahigh and heavy roof steel structure can be improved as follows:
wherein, the step of prefabricating the rigid material specifically comprises the following steps:
referring to a construction drawing, determining the specification and the number of various steel components required by the project;
determining the detailed size of the steel member according to the design drawing;
providing the design drawing to a steel structure processing plant, and manufacturing steel components according to the drawing by the processing plant;
returning the processed steel member to the field, and detecting on site;
performing rust prevention treatment on the steel member;
numbering the prefabricated steel components, corresponding to the design drawing, and backing up the table.
The method specifically comprises the steps of utilizing a node diagram model to define main nodes and key steps in a construction process according to a construction drawing, and specifically comprises the following steps:
building a node diagram model of the steel structure according to the construction drawing;
obtaining a linear sequence of the nodes through topological sequencing;
establishing a critical path model, and calculating the earliest completion time and the latest completion time of each node;
introducing a time allowance to judge the criticality of the node;
and outputting the main node and the key node.
The step of arranging the field specifically comprises the following steps:
determining and marking the specific position of the steel structure according to the design drawing of the construction drawing;
marking out an operation and storage material field around the steel structure position;
surrounding shielding is arranged around the construction facility, and a construction channel is reserved.
Wherein, the step of steel construction installation specifically includes:
determining the assembly sequence of the steel structure according to a construction scheme;
confirming locating points and elevations of the steel structure on site;
hoisting the steel member in place by using a crane, and temporarily connecting and fixing the steel member;
for a high and large steel structure, a sectional hoisting method is adopted to mount components section by section;
after the installation is finished, the integral linear detection is carried out, and the linear precision of the steel structure is ensured to meet the requirement. Wherein, the welding and bolting steps specifically include:
cleaning the welding part;
determining the type and the size of a welding seam according to a construction drawing;
after the welding is finished, cleaning welding slag in time, and performing repair welding if necessary;
and carrying out ultrasonic or X-ray nondestructive detection to confirm that the quality of the welding seam meets the requirements.
The steel structure adjusting step specifically comprises the following steps:
checking the comparison of the actual installation condition and the design drawing according to the construction record;
measuring the actual deviation of the component by adopting linear staff, a level gauge and other devices;
calculating the quantity to be adjusted according to the deviation condition, and marking the quantity at the corresponding position;
the crane hoists the corresponding components, and fine adjustment is carried out to enable the components to return to the design position; after the adjustment is completed, the measurement is carried out again, and the deviation is determined to be controlled within the allowable range.
Wherein, the step of steel construction anticorrosion and insulation specifically includes:
selecting proper anti-corrosion paint according to the service environment of the steel structure;
selecting corresponding primer according to the surface treatment condition of the steel member;
priming paint, intermediate paint after drying, and finishing paint;
the coating is carried out by adopting a spraying or brushing mode;
and after finishing coating, performing visual inspection, thickness measurement and adhesion test, and performing paint repair on the unqualified positions until the quality requirement is met.
Further, there are edges and nodes in the node graph model, the edges representing steel materials, and the nodes representing points at which the steel materials are welded.
Further, the topology ordering method adopts an bubbling ordering or path ordering algorithm.
Compared with the prior art, the construction method of the steel structure of the large-span, ultrahigh and heavy roof has the beneficial effects that: through a scientific and reasonable construction scheme, key nodes are identified in a topological ordering mode, and the control is performed in a targeted manner, so that potential safety hazards in the construction process are reduced to the greatest extent. The method solves the technical problems that the prior art usually carries out sequencing in a manual experience mode, and the main nodes and key steps are not considered in the sequencing process.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method provided by the present invention;
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
Thus, the following detailed description of the embodiments of the invention, as 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, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
As shown in FIG. 1, the invention provides a flow chart of a construction method of a large-span, ultrahigh and heavy roof steel structure, which comprises the following steps:
s10, prefabricating steel: prefabricated steel components including columns, beams, scaffolds;
s20, construction drawing analysis: utilizing a node diagram model, and defining main nodes and key steps in the construction process according to a construction drawing;
s30, field arrangement: according to the construction drawing and the construction conditions, the construction site is arranged;
s40, steel structure installation: installing a steel structure according to a construction drawing;
s50, welding and bolting: welding and bolting the steel structure;
s60, steel structure adjustment: adjusting the installed steel structure to ensure that the steel structure meets the design requirement;
s70, corrosion prevention and insulation of the steel structure: and finishing the corrosion prevention and insulation treatment of the steel structure.
The following description of the specific embodiments of the above steps is as follows:
the specific embodiment of step S10 is as follows:
and referring to the construction drawing, determining the specification and the number of various steel components required by the project. Including H-steel, I-steel, SQUARE tubes, etc. And determining the detailed size of the steel member according to the design drawing. Such as the cross-sectional dimensions of the beam, the length of the column, etc. And purchasing the required steel according to the engineering quantity list. The steel purchasing quantity is controlled, so that the requirement is met, the factors such as transportation, stacking and the like are considered, and excessive purchasing is avoided. And (5) carrying out counting, sorting and stacking after the steel is transported to a construction site. And the steel materials are reasonably stacked according to the type and the size of the steel materials, so that the steel materials are convenient to take later. And providing the design drawing to a steel structure processing plant, and manufacturing steel components according to the drawing by the processing plant. Cutting, bending, welding steel plates, section steel and the like. And returning the processed steel member to the field, and detecting on site. Checking the size and the quality of the welding seam, and the like, and ensuring that the design requirements are met. The steel member is subjected to rust-proof treatment. Spraying a corrosion protection paint or using other corrosion protection methods. Numbering the prefabricated steel components, corresponding to the design drawing, and backing up the table. And reasonably stacking the prefabricated steel components according to the construction sequence and the principle of convenient transportation. And (5) making a maintenance scheme of the steel member. Includes rain-proof, sun-proof, dampproof measures, etc. to ensure the quality of steel.
Through the step S10, the prefabrication work of the steel structure can be systematically performed, and a solid foundation is laid for subsequent construction. The method has strong operability and can effectively ensure that the quality of the prefabricated steel component meets the requirements.
For the specific implementation of the construction drawing analysis in the step S20, the following technical measures may be taken:
1. establishing node diagram model
First, according to a construction drawing, main nodes and components of the tapping structure are abstracted. Define the node set as n= { N 1 ,n 2 ,...,n m The component set is E= { E } 1 ,e 2 ,...,e n }. Wherein the nodes represent key points of the steel structure, and the components represent connection parts among the nodes. Then, a node association graph g= (N, E) is established, and the nodes are connected based on the components.
2. Construction of topology ordering algorithm
According to the node diagram, topological ordering of the nodes can be established, and the topological ordering can represent front-back dependency relationship among the nodes. The specific algorithm is as follows:
initializing a node income degree array in_deg [ n ] i ]Node access array visible [ n ] i ]Sequencing result array topo
For each edge<n i ,n j >:
in_deg[n j ]++
Store node with ingress degree 0 into queue Q
While Q is not null:
n＝Q.pop()
adding n to the end of topo
For each outgoing edge of n < n, m >:
in_deg[m]--
if in_deg [ m ] = 0, add m to Q
Return topo
Through topological sequencing, the linear sequence of the nodes can be obtained, and the front node needs to be constructed first. Wherein, the sorting mode can also adopt a bubbling sorting or path sorting algorithm.
3. Establishing a critical path model
And further establishing a critical path model based on the topological order. The following parameters were introduced:
T i section of a gameConstruction time of point i
W i Earliest start time of node i
F i Latest start time of node i
For each node calculate W i ＝max(W k +T k ),Precursor node
Calculate (reverse) for each node F i ＝min(F k -T k ),Successor node
If W is i ＝F i The node is on the critical path. The critical path length is the sum of node times Σ i epsilon critical path T i 。
Through the critical path model, critical nodes and critical components in the construction process can be identified.
4. Introducing time margin to judge criticality
On the basis of the model, the key of the time allowance judging node is further introduced:
RTL i ＝F i -T i -W i
the smaller the time margin, the less flexible the node is in the planning time, and the more critical the node is.
According to the time margin size, the main node and the key node can be distinguished.
The specific embodiment of step S30 is as follows:
and determining and marking the specific position of the steel structure according to the design drawing of the construction drawing. And (5) marking out an operation and storage site around the steel structure position. Enough operation space is reserved. The temporary ground hardening treatment can be used for road reconstruction if necessary, so as to ensure the ground bearing capacity of the field. Temporary facilities for construction such as temporary offices, material sheds, safety warning signs and the like are arranged. Surrounding shielding is arranged around the construction facility, and necessary construction channels are reserved. And (5) performing ground cleaning work to clean sundries, dirty soil and the like in a construction site. And the material field stacking area is defined, and stacking is performed according to type and partition, so that statistics and collusion are facilitated. And determining the transportation route and the operation space of the mechanical equipment, and other constructions cannot be influenced. Measurement benchmarks and axes are determined with supervision to guide subsequent construction positioning. The surrounding building environment is protected, and damage to the surrounding building environment in the construction process is avoided. Optionally, the position of the water producing and draining facilities is reserved so as to avoid water accumulation. Optionally, temporary parking lots and construction channels are arranged, so that the places are orderly.
Step S30 creates favorable site environment and conditions for steel structure construction by reasonable planning and arrangement of construction sites. The scheme has strong operability and is favorable for smooth construction.
The specific embodiment of step S40 is as follows:
the order of assembly of the steel structure is determined according to the construction scheme, typically from bottom to top, left to right. And confirming the locating point and the elevation of the steel structure on site, and comparing with a construction drawing to ensure that the steel structure meets the design requirement. The prefabricated steel parts are assembled strictly according to the construction drawing, and the design is not allowed to be changed on site. And hoisting the steel member in place by using a crane, and temporarily connecting and fixing the steel member. And tightly controlling the hoisting range and the hoisting speed. And for the high and large steel structure, a sectional hoisting method is adopted to mount the components section by section. And (3) carrying out on-site adjustment and correction according to the actual installation condition of the components, and controlling the dislocation error. After the installation is finished, the integral linear detection is carried out, and the linear precision of the steel structure is ensured to meet the requirement. The scaffold or work table is installed for subsequent welding and corrosion protection operations. After the components are hoisted and installed, the sites are cleaned in time, and hoisting equipment is removed.
The specific embodiment of step S50 is as follows:
cleaning the welding part, and removing factors affecting the welding quality, such as grease, rust and the like. And determining the type and the size of the welding seam according to the construction book. The welding process parameters are strictly controlled. And selecting matched welding rods, and strictly forbidding the use of unqualified welding rods. The debris must be cleaned. The welder must have effective operation evidence, strictly follow the operation rules and make protective measures. Ensure the stable power supply of the welding machine and good grounding. Welding is prohibited on overcast and rainy days. And a welding device meeting the requirements is adopted during welding, so that the full protection of a weld junction is ensured. After the welding is finished, the welding slag is cleaned in time, and repair welding is performed if necessary. The surface treatment is smooth and beautiful. And carrying out ultrasonic or X-ray nondestructive detection to confirm that the quality of the welding seam meets the requirements. And (5) performing bolt connection according to the connection design. The tightening torque is controlled so as not to excessively tighten. After the connection is completed, detection is performed to ensure firm connection and orderly arrangement of all the components.
The specific embodiment of step S60 is as follows:
and checking the comparison of the actual installation condition and the design drawing according to the construction record. The actual deviation of the component is measured using a linear scale, a level gauge, or the like. And calculating the quantity to be adjusted according to the deviation condition, and marking the quantity at the corresponding position. The temporary connection is realized by using bolts, and the adjustment in a welding mode is not needed. The crane lifts the corresponding member and performs fine adjustment to return to the design position. After the adjustment is completed, the measurement is carried out again, and the deviation is determined to be controlled within the allowable range. And (5) carrying out corrosion prevention treatment on the regulated component in a supplementing way, and ensuring continuous and complete coating. Recording the adjustment condition, and updating the construction data for subsequent use. After all adjustment is completed, comprehensive inspection is performed to ensure that the alignment of the steel structure and the position accuracy of each component meet the requirements. And photographing and archiving the hidden part for inspection by a supervision department.
The specific embodiment of step S70 is as follows:
according to the service environment of the steel structure, proper anti-corrosion paint is selected, and epoxy coal tar pitch and the like are generally adopted. And selecting corresponding primer or intermediate paint according to the surface treatment condition of the steel member. The surface of the steel structure must be cleaned up, and the steel structure has no dirt such as greasy dirt, rust and the like, and has proper surface roughness. Firstly priming paint, intermediate paint after drying, and finally finishing paint. And (3) coating a plurality of layers, wherein the thickness of a paint film meets the requirement. The parts and the connecting parts which need to be welded after the coating are avoided. The interval time between each layer of coating is strictly according to the technical regulations, and the interval cannot be shortened. The spraying or brushing mode is adopted during the coating, so that the phenomena of missing coating, uneven thickness and the like are avoided. After the coating is completed, visual inspection, thickness measurement, adhesion test and other detection are performed. And (5) paint supplementing is carried out on the position with unqualified detection until the quality requirement is met. And a flame-retardant rock wool insulating plate is paved on the surface of the steel structure, so that the fixation is firm. And the insulating plates are tightly attached, and insulating materials are supplemented at the gaps, so that the generation of a thermal bridge is prevented. And a waterproof layer is arranged on the top surface to protect the insulating plate from water seepage of the cement plate. Through strict anti-corrosion and insulating construction processes, the service life of the steel structure can be effectively guaranteed, and the steel structure has good heat insulation effect.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. The construction method of the large-span, ultrahigh and heavy roof steel structure is characterized by comprising the following steps of:
s10, prefabricating steel: prefabricated steel components including columns, beams, scaffolds;
s20, construction drawing analysis: utilizing a node diagram model, and defining main nodes and key steps in the construction process according to a construction drawing;
s30, field arrangement: according to the construction drawing and the construction conditions, the construction site is arranged;
s40, steel structure installation: installing a steel structure according to a construction drawing;
s50, welding and bolting: welding and bolting the steel structure;
s60, steel structure adjustment: adjusting the installed steel structure to ensure that the steel structure meets the design requirement;
s70, corrosion prevention and insulation of the steel structure: and finishing the corrosion prevention and insulation treatment of the steel structure.
2. The method for constructing the steel structure of the large-span, ultrahigh and heavy-duty roof according to claim 1, wherein the step of prefabricating the steel material comprises the following steps:
referring to a construction drawing, determining the specification and the number of various steel components required by the project;
determining the detailed size of the steel member according to the design drawing;
providing the design drawing to a steel structure processing plant, and manufacturing steel components according to the drawing by the processing plant;
returning the processed steel member to the field, and detecting on site;
performing rust prevention treatment on the steel member;
numbering the prefabricated steel components, corresponding to the design drawing, and backing up the table.
3. The construction method of the large-span, ultrahigh and heavy roof steel structure according to claim 1, wherein the steps of utilizing a node diagram model to define main nodes and key steps in the construction process according to a construction drawing specifically comprise:
building a node diagram model of the steel structure according to the construction drawing;
obtaining a linear sequence of the nodes through topological sequencing;
establishing a critical path model, and calculating the earliest completion time and the latest completion time of each node;
introducing a time allowance to judge the criticality of the node;
and outputting the main node and the key node.
4. The method for constructing the steel structure of the large-span, ultrahigh and heavy-duty roof according to claim 1, wherein the step of arranging the site comprises the following steps:
determining and marking the specific position of the steel structure according to the design drawing of the construction drawing;
marking out an operation and storage material field around the steel structure position;
surrounding shielding is arranged around the construction facility, and a construction channel is reserved.
5. The method for constructing the steel structure of the large-span, ultrahigh and heavy-duty roof according to claim 1, wherein the step of installing the steel structure comprises the following steps:
determining the assembly sequence of the steel structure according to a construction scheme;
confirming locating points and elevations of the steel structure on site;
hoisting the steel member in place by using a crane, and temporarily connecting and fixing the steel member;
for a high and large steel structure, a sectional hoisting method is adopted to mount components section by section;
after the installation is finished, the integral linear detection is carried out, and the linear precision of the steel structure is ensured to meet the requirement.
6. The method for constructing the steel structure of the large-span, ultrahigh and heavy-duty roof according to claim 1, wherein the step of welding and bolting comprises the following steps:
cleaning the welding part;
determining the type and the size of a welding seam according to a construction drawing;
after the welding is finished, cleaning welding slag in time, and performing repair welding if necessary;
and carrying out ultrasonic or X-ray nondestructive detection to confirm that the quality of the welding seam meets the requirements.
7. The method for constructing the steel structure of the large-span, ultrahigh and heavy-duty roof according to claim 1, wherein the step of adjusting the steel structure specifically comprises the following steps:
checking the comparison of the actual installation condition and the design drawing according to the construction record;
measuring the actual deviation of the component by adopting linear staff, a level gauge and other devices;
calculating the quantity to be adjusted according to the deviation condition, and marking the quantity at the corresponding position;
the crane hoists the corresponding components, and fine adjustment is carried out to enable the components to return to the design position;
after the adjustment is completed, the measurement is carried out again, and the deviation is determined to be controlled within the allowable range.
8. The construction method of a large-span, ultra-high and heavy-duty roof steel structure according to claim 1, wherein the steps of corrosion prevention and insulation of the steel structure specifically comprise:
selecting proper anti-corrosion paint according to the service environment of the steel structure;
selecting corresponding primer according to the surface treatment condition of the steel member;
priming paint, intermediate paint after drying, and finishing paint;
the coating is carried out by adopting a spraying or brushing mode;
and after finishing coating, performing visual inspection, thickness measurement and adhesion test, and performing paint repair on the unqualified positions until the quality requirement is met.
9. A method of constructing a large span, ultra high, heavy duty roof steel structure according to claim 3, wherein there are edges and nodes in the node diagram model, the edges representing steel materials, the nodes representing points where the steel materials are welded.
10. A method of constructing a large span, ultra high, heavy duty roof steel structure according to claim 3, wherein said topology ordering method employs a bubbling ordering or path ordering algorithm.
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