CN112761247B - Fabricated box plate steel structure anticorrosion building system and construction method - Google Patents
Fabricated box plate steel structure anticorrosion building system and construction method Download PDFInfo
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- CN112761247B CN112761247B CN202110370652.4A CN202110370652A CN112761247B CN 112761247 B CN112761247 B CN 112761247B CN 202110370652 A CN202110370652 A CN 202110370652A CN 112761247 B CN112761247 B CN 112761247B
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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
- E04B1/02—Structures consisting primarily of load-supporting, block-shaped, or slab-shaped elements
- E04B1/08—Structures consisting primarily of load-supporting, block-shaped, or slab-shaped elements the elements consisting of metal
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
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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
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/64—Insulation or other protection; Elements or use of specified material therefor for making damp-proof; Protection against corrosion
- E04B1/642—Protecting metallic construction elements against corrosion
Abstract
The invention relates to an assembly type box plate steel structure anticorrosion building system and a construction method, which are formed by splicing box plate steel structure building module units, wherein the box plate steel structure building module units are formed by welding enclosure wall plates and stiffening floor plates, and an anticorrosion protective layer is coated on the surface of a stiffening steel plate to form component anticorrosion; the box plate steel structure building module units are spliced in the horizontal direction and/or the height direction, and the enclosure wall boards and/or the stiffening floor boards which are in contact with each other are connected and fixed by adopting insulating components to form connection corrosion prevention. The comprehensive anticorrosion measure and the implementation method of the assembled box plate steel structure building provided by the invention have the advantages that the anticorrosion capacity of the assembled box plate steel structure building is comprehensively and systematically improved from the anticorrosion protective coating structure on the component layer surface to the reduction of the metal potential difference on the component connecting layer surface and then to the sacrificial anode cathode protection of the integral structure, the service life of the structure is obviously prolonged, and the applicability of the assembled box plate steel structure building is enhanced.
Description
Technical Field
The invention relates to the field of building structure engineering, in particular to an anticorrosive building system with an assembled box plate steel structure and a construction method.
Background
The box plate steel structure assembly type building is a novel assembly type steel structure building system. The proposal of the structure mode refers to ship superstructure, and adopts ribbed steel plates directly as vertical and horizontal structural members for bearing horizontal load and vertical load. Different from the traditional steel plate wall structure, the box plate steel structure system has no obvious peripheral frame beams and frame columns, and the stress model is the whole stress of the box body in space, so the structural form has good stress and earthquake resistance. Meanwhile, as no obvious peripheral frame beams and frame columns exist, the box plate steel structure system can provide a column-free and beam-free structural space with a large span, and has great practical value and economic value. As the stressed members of the box plate steel structure assembly type building are stiffening steel plates, namely all structural members are steel structures, the anti-corrosion measure of the structure is the key to whether the box plate steel structure assembly type building can be practically applied. According to the design requirement of 50-year service life of a common building, the self structural characteristics of the box plate steel structure fabricated building are combined, and the anticorrosion measures capable of meeting the service life of the box plate steel structure fabricated building are researched and developed, so that the structure in the form is a problem to be solved urgently.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a comprehensive anticorrosion measure and an anticorrosion building system suitable for a fabricated box plate steel structure building. Three layers of components, connection and even an integral structure form a three-in-one omnibearing anticorrosion measure, electrochemical corrosion of a building structure is reduced to the maximum extent, and the durability of the building is improved.
The technical scheme of the invention is as follows:
the invention firstly provides an assembly type box plate steel structure anticorrosion building system which is formed by splicing box plate steel structure building module units in the horizontal direction and/or the height direction, wherein
The box plate steel structure building module unit is formed by welding enclosure wall panels and stiffening floor slabs in an enclosing mode, the enclosure wall panels and the stiffening floor slabs are made of stiffening steel plates, and anticorrosion protective layers are coated on the surfaces of the stiffening steel plates to form anticorrosion of components;
the box plate steel structure building module units are spliced in the horizontal direction and/or the height direction, insulating interlayers are added between the mutually-contacted enclosure wall plates of the left and right adjacent two module units and/or between the mutually-contacted stiffening floor plates of the upper and lower adjacent two layers of module units, and the mutually-contacted enclosure wall plates and/or the stiffening floor plates are connected and fixed by adopting insulating members to form connection corrosion prevention.
Optionally, the anticorrosive protective layer is composed of a primer layer, an intermediate coating and a surface coating, wherein the primer layer is formed by spraying zinc, aluminum or zinc-aluminum alloy, the thickness of the primer layer is larger than or equal to 120 μm, the intermediate coating is formed by two epoxy resin hole sealing layers in sequence, the thickness of the intermediate coating is larger than or equal to 70 μm, two epoxy micaceous iron intermediate paint layers are formed, the thickness of the intermediate paint layer is larger than or equal to 100 μm, the surface coating is formed by two fluorocarbon finish coats, and the.
Optionally, when the box plate steel structure building module unit is spliced in the horizontal direction, the connection is anticorrosive: the edge has seted up the bolt hole all around to the steel sheet of putting more energy into, is provided with insulating sleeve in the through-hole that the bolt hole of the adjacent leg wallboard of controlling two adjacent modular units forms, has inserted connecting bolt in the insulating sleeve, sets up insulating washer between connecting bolt's both ends and the corresponding leg wallboard, controls two adjacent modular units through the nut fastening, realizes two boxboard steel construction building modular unit in the connection of horizontal direction.
Optionally, when the box plate steel structure building module unit is spliced in the height direction, the connection is anticorrosive: two-layer module unit adjacent from top to bottom is connected through a connecting steel plate, the edge has seted up the bolt hole all around to the steel sheet of putting more energy into, the last bolt hole of having seted up of connecting steel plate corresponds, be provided with insulating sleeve in the through-hole that adjacent leg wallboard of two-layer module unit from top to bottom and connecting steel plate's bolt hole formed, connecting bolt has been inserted in the insulating sleeve, set up insulating washer between connecting bolt's both ends and corresponding leg wallboard and the connecting steel plate, through adjacent two-layer module unit about the nut fastening, realize two boxboard steel construction building module unit in direction of height's.
Optionally, insulating interlayers are arranged between the adjacent wall panels and the connecting steel plates of the two layers of module units which are adjacent up and down, and between the bottom plate of the upper module unit and the top plate of the lower module unit.
Optionally, the insulating interlayer is an insulating rubber plate, epoxy glass fiber cloth or a polyethylene anticorrosive insulating tape.
Optionally, the method further comprises the step of installing a sacrificial anode cathodic protection system at the bottom of the boxboard steel structure building to form structural corrosion resistance, wherein the sacrificial anode cathodic protection system is composed of sacrificial anodes and a confluence cable, and the sacrificial anodes are buried around the boxboard steel structure building foundation and are electrically connected with the stiffening steel plate of the bottom enclosure wall plate through the confluence cable.
Optionally, the sacrificial anode is embedded 3-5m away from the box plate steel structure building bottom wall panel and 1m below the ground, and chemical filler is filled around the sacrificial anode.
The invention also provides a construction method of the fabricated box plate steel structure anticorrosion building system, which is used for constructing the fabricated box plate steel structure anticorrosion building system and comprises the following specific steps:
s10: welding stiffening ribs in corresponding arrangement forms on the steel plates according to different wall panels and stiffening floor slabs in a prefabrication factory to form stiffening steel plates;
s20: performing shot blasting rust removal on the surface of the steel plate after welding is finished, performing surface cleanliness treatment after rust removal, and enabling the residual quantity of soluble chlorides on the surface to be not higher than 5 mu g/cm 2;
s30: immediately coating an anticorrosive protective layer on the stiffened steel plate after the surface treatment meets the requirement; the bottom coating is sprayed with zinc, aluminum or zinc-aluminum alloy, the thickness is more than or equal to 120 mu m, the intermediate coating is firstly coated with two epoxy resin hole sealing channels, the thickness is more than or equal to 70 mu m, then the two epoxy micaceous iron intermediate paint channels are coated, the thickness is more than or equal to 100 mu m, the top coating is fluorocarbon finish paint channels, and the thickness is more than or equal to 60 mu m; reserving a certain width range at the edge of the stiffening steel plate without coating an anti-corrosion protective layer for welding connection with the adjacent other stiffening steel plate;
s40: welding and connecting corresponding enclosure wall boards and stiffening floor slabs to form a box plate steel structure building module unit, and then performing the operation of the step S30 on the welding part in the module unit to finish the coating of an anticorrosive protective layer of the whole box plate steel structure building module unit;
s50: according to the concatenation mode of box building at horizontal direction and/or direction of height equipment boxboard steel construction building module unit, set up insulating interlayer between the adjacent wall wallboard of adjacent module unit about during individual layer equipment, and insert connecting bolt in the bolt hole between the adjacent wall wallboard of adjacent module unit about, set up insulating washer between connecting bolt's both ends and the corresponding wall wallboard, set up insulating interlayer between the adjacent stiffening floor of adjacent module unit about during multilayer equipment and between the adjacent wall wallboard of adjacent module unit about and the connecting steel plate, and insert connecting bolt in the bolt hole between the adjacent wall wallboard of adjacent module unit about and the connecting steel plate, set up insulating washer between connecting bolt's both ends and corresponding wall wallboard and the connecting steel plate, fix with the nut at last.
Optionally, the method further comprises the steps of:
s60: after the box plate steel structure building is assembled, a sacrificial anode cathodic protection system is installed around the connecting part of the bottom enclosure wall board and the foundation, the sacrificial anode is embedded in a position which is 3-5m away from the bottom enclosure wall board of the box plate steel structure building and 1m below the ground, chemical fillers are filled around the sacrificial anode, and the sacrificial anode is electrically connected with a stiffening steel plate of the bottom enclosure wall board through a confluence cable.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a comprehensive anti-corrosion measure and an implementation method for an assembled box plate steel structure building. Specifically, at least the following substantial effects are exhibited:
(1) the enclosure wall plate and the stiffening floor of the fabricated box plate steel structure building are produced in a prefabricated field, and the anticorrosion protective coating is coated after the production is finished, so that the coating quality of the anticorrosion protective coating is effectively ensured;
(2) by combining the splicing form of the assembled box plate steel structure building, the insulating interlayer is arranged between the adjacent module units, so that the potential difference between the adjacent module units is effectively reduced, and the electrochemical corrosion of the whole structure is reduced;
(3) the insulating sleeves are arranged in the bolt holes of the wallboard and the connecting steel plate, and the insulating washers are arranged at the contact positions of the bolts and the steel plate, so that the corrosion of the bolt connection position is effectively reduced;
(4) by arranging the sacrificial anode cathode protection device around the bottom enclosure wall plate of the fabricated box plate steel structure building, the electrochemical corrosion of the bottom steel plate wall of the building and soil is reduced to the maximum extent, and the durability of the building is remarkably improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, shall fall within the scope covered by the technical contents disclosed in the present invention.
FIG. 1 is a schematic view of an anticorrosion coating of a stiffened steel plate according to one embodiment of the present invention;
FIG. 2 is a schematic view of the horizontal connection of the structural anti-corrosion measures of the boxboard steel structure building module unit according to one embodiment of the invention;
FIG. 3 is a schematic view of the anti-corrosion construction measures for the height direction connection of the box plate steel structure building module units according to one embodiment of the present invention;
fig. 4 is a schematic view of a sacrificial anode cathodic protection system adopted by a box plate steel structure building according to an embodiment of the invention.
The meaning of the individual reference symbols in the figures is:
1, stiffening steel plates; 2-a stiffening rib; 3-anticorrosive protective layer; 4-bolt holes; 5, insulating interlayer; 6-connecting bolts; 7-a metal gasket; 8-insulating washer; 9-an insulating sleeve; 10-a nut; 11-connecting steel plates, 12-upper module unit enclosure wall plates; 13-upper modular unit floor; 14-lower module unit enclosure wall panels; 15-lower modular unit top plate; 16-a sacrificial anode; 17-a bus cable; and (18) constructing a box plate steel structure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are described in further detail below with reference to the embodiments and the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
In the present invention, the terms "comprises/comprising," "consisting of … …," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product, apparatus, process, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product, apparatus, process, or method if desired. Without further limitation, an element defined by the phrases "comprising/including … …," "consisting of … …," or "comprising" does not exclude the presence of other like elements in a product, device, process, or method that comprises the element.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are intended to be inclusive and mean that, for example, they may be fixedly connected or detachably connected or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It is to be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship illustrated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device, component, or structure must have a particular orientation, be constructed in a particular orientation, or be operated in a particular orientation, and are not to be construed as limiting the invention.
Referring to fig. 1-3, the fabricated box plate steel structure anticorrosion building system provided by the invention is formed by splicing box plate steel structure building module units in the horizontal direction and/or the height direction.
Box steel construction building module unit encloses by leg wallboard and stiffening floor and closes the welding and form, and leg wallboard and stiffening floor adopt the steel sheet 1 of putting more energy into, and 1 surface coating has anticorrosive coating 3 at the steel sheet of putting more energy into, forms that the component is anticorrosive.
As the splicing of adjacent boxboard steel structure building modular unit in horizontal direction when single-layer structure, as shown in figure 2, the splicing of adjacent boxboard steel structure building modular unit in horizontal direction and direction of height when many high-rise structures, as shown in figure 3, and between the enclosure wall board of the mutual contact of two adjacent modular units about, and between the stiffening floor of the mutual contact of two adjacent layer modular units from top to bottom, add insulating interlayer 5, and to the enclosure wall board of mutual contact, the stiffening floor adopts insulating member to connect fixedly, form and connect anticorrosive.
The enclosure wall plate and the stiffening floor of the box plate steel structure building module unit are produced in the prefabricated field, and the assembled building is formed by splicing the enclosure wall plate and the stiffening floor on the spot, so that the process is simple, the construction time is greatly shortened, and the construction difficulty is reduced.
The invention takes anti-corrosion measures for the whole building system at least from the two aspects of 'component' to 'connection', can effectively reduce the electrochemical corrosion of the whole structure and obviously improve the durability of the building.
According to the invention, the outer surface of the stiffening steel plate 1 is coated with the anticorrosive protection layer, and the outer surface of the stiffening steel plate is coated with a layer of coating for anticorrosive protection, so that the stiffening steel plate is physically isolated from a corrosive medium (atmospheric environment), and the electrochemical corrosion of the corrosive medium to the steel plate can be reduced.
The anticorrosion protective layer is generally composed of a base coat, a middle coat and a surface coat. When selecting the coating, the coating thickness cannot be too thick, considering both the feasibility of construction and the quality of the coating after coating and also considering economic factors.
The anticorrosive protective layer consists of a bottom coating, an intermediate coating and a surface coating. The primer layer is required to have strong adhesion and cathodic protection, and is generally a metal spraying or zinc-rich primer, wherein the metal spraying can directly make the metal zinc in dense contact with the substrate, and is therefore the best protection measure. One of the disadvantages of metal spraying is that the requirement for surface treatment grade of metal base body is high, and it is inconvenient for on-site construction, but because the anticorrosion spraying of component layer surface of box plate type structure is completed in prefabricated factory, so that it has no problem of difficult on-site construction, so that the invented priming coating can be selected from metal spraying, preferably zinc, aluminium or zinc-aluminium alloy spraying, and its thickness is greater than 120 micrometers.
The technical requirement of the intermediate coating is that the intermediate coating has impermeability, the mica sheet filler is added into the epoxy intermediate coating, the impermeability of the intermediate coating is greatly improved due to the addition of the mica sheet filler, and the compatibility of the epoxy mica intermediate coating with the primer and the finish is excellent. The intermediate coating of the invention selects two epoxy micaceous iron intermediate paints with the thickness more than or equal to 100 mu m, and before the epoxy micaceous iron intermediate paints are coated, the two epoxy resin hole sealing paints with the thickness more than or equal to 70 mu m are firstly constructed, which has the functions of increasing the thickness of the intermediate coating and facilitating the laying of the epoxy micaceous iron.
The technical requirements of the surface coating are corrosion resistance and oxidation resistance, and the fluorocarbon coating is a better weather-resistant material. The surface coating of the invention adopts two layers of fluorocarbon finish, and the thickness is more than or equal to 60 mu m.
By adopting the coating material and the construction thickness, the total thickness of the anticorrosive protective layer is more than 350 mu m, and the factors of anticorrosive performance and construction cost are considered.
Referring to fig. 1 and 2 again, when the box plate steel structure building module unit of the invention is spliced in the horizontal direction, the concrete structure of connection corrosion prevention is as follows:
the edge has seted up bolt hole 4 all around to stiffening steel sheet 1, it is provided with insulating sleeve 9 in the through-hole of the bolt hole 4 formation of the adjacent leg wallboard of two adjacent modular unit about, inserted connecting bolt 6 in insulating sleeve 9, metal washer 7 is established to connecting bolt 6's both ends cover, set up insulating washer 8 again between metal washer 7 and corresponding leg wallboard, two adjacent modular unit about fastening through nut 10, realize two boxboard steel construction building modular unit in the connection of horizontal direction.
When the box plate steel structure building module units are spliced in the height direction, the concrete structure of corrosion resistance is connected as shown in figure 3, an upper module unit wall enclosing plate 12 and a lower module unit wall enclosing plate 14 are connected through a connecting steel plate 11 after being butted, a bottom plate 13 of the upper module unit is attached to a top plate 15 of the lower module unit, bolt holes 4 are arranged at the peripheral edge of a stiffening steel plate 1 adopted by the wall plate, bolt holes are correspondingly arranged on the connecting steel plate 11, an insulating sleeve 9 is arranged in a through hole formed by adjacent wall enclosing plates of two layers of adjacent module units and bolt holes of the connecting steel plate, a connecting bolt 6 is inserted into the insulating sleeve 9, a metal gasket 7 and an insulating gasket 8 are arranged between the two ends of the connecting bolt 6 and the corresponding wall enclosing plates, two adjacent layers of module units are fastened by nuts 10, so that the two box plate steel structure building module units are connected in the height direction.
Further, for the box plate steel structure building module unit in the direction of height concatenation, between adjacent wall wallboard and the connecting steel plate 11 of two-layer module unit adjacent from top to bottom to and between upper portion module unit bottom plate 13 and lower part module unit roof 15, also set up insulating interlayer 5.
In the aspect of component connection, as the splicing between the box plate steel structure building module units consisting of the enclosure wall panels and the stiffening floor slabs is bolt connection, the positions of bolt holes on the stiffening steel plates can generate stress concentration and are positions which are easy to corrode, and in addition, the unavoidable potential difference between the screw rods and the steel plates, the anticorrosion measures of the connecting positions between the components are the key of the anticorrosion of the whole box plate steel structure. According to the invention, the insulating interlayer is arranged between the adjacent module units, the insulating sleeve is arranged in the bolt hole of the wallboard and the connecting steel plate, and the insulating gasket is arranged at the contact position of the bolt and the steel plate, so that the potential difference between the adjacent module units can be effectively reduced, the corrosion at the bolt joint is reduced, and the electrochemical corrosion degree of the whole structure is reduced.
The insulating interlayer 5 is an insulating rubber plate, epoxy glass fiber cloth or a polyethylene anticorrosive insulating tape.
With continued reference to fig. 4, as a further improvement, the anticorrosion building system of the invention further comprises a sacrificial anode cathodic protection system installed at the bottom of the boxboard steel structure building 18, wherein the sacrificial anode cathodic protection system is composed of a sacrificial anode 16 and a bus cable 17, a plurality of sacrificial anodes 16 are buried around the base of the boxboard steel structure building 18 and are electrically connected with the stiffening steel plate 1 of the bottom enclosure wall plate through the bus cable 17, so as to form structural anticorrosion.
The sacrificial anode 16 is buried in the position 3-5m away from the bottom wall board of the box plate steel structure building and 1m below the ground, preferably buried below the freezing line, and the periphery is filled with chemical filler. The sacrificial anodes were arranged around the outside wall of the boxboard steel structure building 18 at a spacing of 2 m.
The type of sacrificial anode is selected according to the soil resistivity and can be a magnesium anode, a zinc anode or a magnesium-zinc alloy anode. Chemical filler is filled around the sacrificial anode 16, and the surface of the sacrificial anode is treated before use to remove an oxide film and oil stains on the surface so that the sacrificial anode has metallic luster; when the bus cable 17 is buried, fine sand with the thickness of 5-10cm is padded on the periphery, and a cement guard plate or red bricks are covered on the upper part of the sand; the bus cable 17 is directly welded on the bottom wall board of the box plate steel structure building 18 and is connected with the sacrificial anode 16 in a welding mode, corresponding protective measures are taken for the welding position, the connecting position is prevented from being broken, and the connecting position needs to be corrosion-resistant and insulated at the same time.
The sacrificial anode cathodic protection system is arranged around the bottom wall panel of the box plate steel structure building to form structural corrosion resistance, and three-in-one omnibearing corrosion prevention measures are formed from three layers of component corrosion prevention and connection corrosion prevention in combination with the existing component corrosion prevention and connection corrosion prevention, so that the electrochemical corrosion of the bottom steel plate wall of the building and soil is reduced to the greatest extent, and the durability of the building is obviously improved.
The construction method of the fabricated box plate steel structure anticorrosion building system comprises the following steps:
welding stiffening ribs in corresponding arrangement forms on the steel plates according to different wall panels and stiffening floor slabs in a prefabrication factory to form stiffening steel plates; referring to fig. 1, a stiffening steel plate 1 is produced in a prefabrication factory, stiffening ribs 2 are welded on the steel plate to manufacture the stiffening steel plate 1, and parameters such as the spacing, the rib plate stiffness ratio and the spacing of the stiffening ribs 2 strictly meet design requirements;
after welding, polishing the welding seam to ensure that the welding seam is continuous and uniform and the surface is smooth, and then performing shot blasting rust removal on the surface of the steel plate, wherein the grade reaches Sa3 grade or better, and the depth of the anchor line is between 40 and 70 mu m; after rust removal, surface cleanliness treatment is carried out to reach 2-grade or better, and the residual quantity of soluble chloride on the surface after treatment is not higher than 5 mu g/cm2(ii) a The coating quality and the anticorrosion protection effect of the anticorrosion protection layer in subsequent construction are strictly ensured by limiting the residual amount of the soluble chloride on the surface;
immediately coating the anti-corrosion protective layer 3 on the stiffened steel plate 1 after the surface treatment meets the requirements; the protective performance of the bottom coating is crucial, good adhesive force is provided, and the bottom coating has a cathode protection effect, the bottom coating is sprayed by zinc, aluminum or zinc-aluminum alloy, the thickness is more than or equal to 120 mu m, the intermediate coating is firstly coated with two epoxy resin hole sealing channels, the thickness is more than or equal to 70 mu m, then the intermediate coating is coated with two epoxy micaceous iron intermediate paints, the thickness is more than or equal to 100 mu m, the surface coating is coated with two fluorocarbon coatings, and the thickness is more than or equal to 60 mu m; the prepared coating is applicable within the working life during the coating of the anti-corrosion protective coating, the coating exceeding the working life is forbidden to be used, and the coating interval time between layers is executed according to different requirements of different coatings; the components and the thicknesses of the anti-corrosion coatings are recommended according to practical engineering experience and are verified by combining experiments, the selected materials of the coatings are the best anti-corrosion materials, the total thickness of the anti-corrosion protective layers is more than or equal to 350 mu m, and the technical requirement that the design age limit is 50 years under the moderate corrosion environment in the technical specification of anti-corrosion coating is met.
For the prefabricated stiffening steel plate 1, a certain width range is reserved at the edge of the stiffening steel plate 1 without coating an anti-corrosion protection layer, namely, a part needing to be welded and connected with another stiffening steel plate is reserved when the anti-corrosion protection layer is coated, the width range of at least 5cm is reserved at the edge of the stiffening steel plate 1, and the anti-corrosion protection layer is not coated within the range of 5cm or only workshop primer paint which is not influenced by welding is coated.
After the coating of the anticorrosive protection layer of the stiffening steel plate 1 is finished, welding and connecting the corresponding enclosure wall plate and the stiffening floor slab according to the design requirement to form a box plate steel structure building module unit, and then performing the anticorrosive protection layer coating construction on the welding part in the module unit to finish the coating of the anticorrosive protection layer of the whole box plate steel structure building module unit;
after the preparation work is completed, the box plate steel structure building module units are assembled in the horizontal direction and/or the height direction according to the splicing mode of box buildings, an insulating interlayer 5 is arranged between the adjacent wall panels of the left and right adjacent module units during single-layer assembly, the material of the insulating interlayer can be an insulating rubber plate, surface layers with insulating functions such as epoxy glass fiber cloth or polyethylene anti-corrosion insulating tapes and the like, when the insulating interlayer 5 is laid, the insulating interlayer is attached to the wall panel of one of the adjacent module units, the adjacent module units are clamped between the adjacent module units after being spliced together, connecting bolts 6 are inserted into bolt holes 4 between the adjacent wall panels of the left and right adjacent module units, insulating gaskets 8 are arranged between the two ends of the connecting bolts 6 and the corresponding wall panels, and when the multi-layer assembly is carried out, the adjacent wall panels of the upper and lower adjacent module units and connecting steel plates 11 An insulating interlayer 5 is arranged between the two adjacent wall panels of the upper and lower adjacent module units, a connecting bolt 6 is inserted into a bolt hole 4 between the adjacent wall panel and the connecting steel plate 11, insulating washers 8 are arranged between the two ends of the connecting bolt 6 and the corresponding wall panel and the connecting steel plate, and finally, the connecting bolt is fixed by a nut 10.
Therefore, the construction of the assembly type box plate steel structure anticorrosion building system is completed, and the anticorrosion protection from the component to the connection of two layers is realized.
After the box plate steel structure building is assembled, a sacrificial anode cathode protection system can be further installed around the connecting part of the box plate steel structure building bottom wall board and the foundation, a sacrificial anode 16 is buried in a position 3m away from the box plate steel structure building bottom wall board and 1m away from the ground, chemical fillers are filled around the sacrificial anode 16, and the sacrificial anode is electrically connected with a stiffening steel plate of the bottom wall board through a confluence cable 17. The chemical filler is mainly used for uniformly dissolving and consuming the sacrificial anode, and can be selected from substances which can generate chemical reaction with the surface of the sacrificial anode to form a compact oxide film, such as calcium sulfate and the like. By applying the structure anticorrosion protective measure to the whole box plate steel structure building, the three layers of the components, the connection and the structure form a three-in-one all-dimensional anticorrosion measure, the durability of the building is obviously improved, and the design service life of 50 years is effectively reached.
Thus, it should be understood by those skilled in the art that while exemplary embodiments of the present invention have been illustrated and described in detail herein, many other variations and modifications can be made, which are consistent with the principles of the invention, from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. An assembly type box plate steel structure anticorrosion building system is formed by splicing box plate steel structure building module units in the horizontal direction and/or the height direction,
the box plate steel structure building module unit is formed by welding enclosure wall boards and stiffening floor slabs in an enclosing mode, the enclosure wall boards and the stiffening floor slabs are made of stiffening steel plates, anticorrosion protective layers are coated on the surfaces of the stiffening steel plates to form component anticorrosion, and each anticorrosion protective layer is composed of a bottom coating, an intermediate coating and a surface coating;
the box plate steel structure building module units are spliced in the horizontal direction and/or the height direction, insulating interlayers are added between the mutually-contacted enclosure wall plates of the left and right adjacent two module units and/or between the mutually-contacted stiffening floor plates of the upper and lower adjacent two layers of module units, and the mutually-contacted enclosure wall plates and/or the stiffening floor plates are connected and fixed by adopting insulating members to form connection corrosion prevention.
2. An anti-corrosive building system according to claim 1, wherein the primer coating is formed by spraying zinc, aluminum or zinc-aluminum alloy with a thickness of 120 μm or more, the intermediate coating is formed by two epoxy resin hole sealing layers with a thickness of 70 μm or more, two epoxy mica iron intermediate paint layers with a thickness of 100 μm or more, and the top coating is formed by two fluorocarbon top coats with a thickness of 60 μm or more.
3. The anticorrosion building system of claim 1, wherein when the box plate steel structure building module units are spliced in the horizontal direction, the connection anticorrosion is as follows: the edge has seted up the bolt hole all around to the steel sheet of putting more energy into, is provided with insulating sleeve in the through-hole that the bolt hole of the adjacent leg wallboard of controlling two adjacent modular units forms, has inserted connecting bolt in the insulating sleeve, sets up insulating washer between connecting bolt's both ends and the corresponding leg wallboard, controls two adjacent modular units through the nut fastening, realizes two boxboard steel construction building modular unit in the connection of horizontal direction.
4. The anticorrosion building system of claim 1, wherein when the box plate steel structure building module units are spliced in the height direction, the connection anticorrosion is as follows: two-layer module unit adjacent from top to bottom is connected through a connecting steel plate, the edge has seted up the bolt hole all around to the steel sheet of putting more energy into, the last bolt hole of having seted up of connecting steel plate corresponds, be provided with insulating sleeve in the through-hole that adjacent leg wallboard of two-layer module unit from top to bottom and connecting steel plate's bolt hole formed, connecting bolt has been inserted in the insulating sleeve, set up insulating washer between connecting bolt's both ends and corresponding leg wallboard and the connecting steel plate, through adjacent two-layer module unit about the nut fastening, realize two boxboard steel construction building module unit in direction of height's.
5. An anticorrosive building system according to claim 4, wherein insulating interlayers are provided between the adjacent wall panels and the connecting steel plates of two adjacent layers of modular units above and below, and between the bottom plate of the upper modular unit and the top plate of the lower modular unit.
6. An erosion resistant building system according to claim 1 or 5 wherein said insulating interlayer is an insulating rubber sheet, epoxy glass fibre cloth or polyethylene erosion resistant insulating tape.
7. The corrosion-resistant building system of claim 1, further comprising a sacrificial anode cathodic protection system installed at the bottom of the boxboard steel structure building to form structural corrosion resistance, wherein the sacrificial anode cathodic protection system is composed of a sacrificial anode and a bus cable, and a plurality of sacrificial anodes are embedded around the boxboard steel structure building foundation and electrically connected with the stiffening steel plate of the bottom enclosure wall plate through the bus cable.
8. The anticorrosive building system of claim 7, wherein the sacrificial anode is embedded at a distance of 3-5m from the bottom wall board of the box plate steel structure building and below 1m from the ground, and chemical fillers are filled around the sacrificial anode.
9. A construction method of an assembly type box plate steel structure anticorrosion building system is used for constructing the assembly type box plate steel structure anticorrosion building system according to any one of claims 1-8, and comprises the following specific steps:
s10: welding stiffening ribs in corresponding arrangement forms on the steel plates according to different wall panels and stiffening floor slabs in a prefabrication factory to form stiffening steel plates;
s20: performing shot blasting rust removal on the surface of the steel plate after welding, performing surface cleanliness treatment after rust removal, wherein the residual quantity of soluble chloride on the surface is not more than 5 mu g/cm after treatment2；
S30: immediately coating an anticorrosive protective layer on the stiffened steel plate after the surface treatment meets the requirement; the bottom coating is sprayed with zinc, aluminum or zinc-aluminum alloy, the thickness is more than or equal to 120 mu m, the intermediate coating is firstly coated with two epoxy resin hole sealing channels, the thickness is more than or equal to 70 mu m, then the two epoxy micaceous iron intermediate paint channels are coated, the thickness is more than or equal to 100 mu m, the top coating is fluorocarbon finish paint channels, and the thickness is more than or equal to 60 mu m; reserving a certain width range at the edge of the stiffening steel plate without coating an anti-corrosion protective layer for welding connection with the adjacent other stiffening steel plate;
s40: welding and connecting corresponding enclosure wall boards and stiffening floor slabs to form a box plate steel structure building module unit, and then performing the operation of the step S30 on the welding part in the module unit to finish the coating of an anticorrosive protective layer of the whole box plate steel structure building module unit;
s50: according to the concatenation mode of box building at horizontal direction and/or direction of height equipment boxboard steel construction building module unit, set up insulating interlayer between the adjacent wall wallboard of adjacent module unit about during individual layer equipment, and insert connecting bolt in the bolt hole between the adjacent wall wallboard of adjacent module unit about, set up insulating washer between connecting bolt's both ends and the corresponding wall wallboard, set up insulating interlayer between the adjacent stiffening floor of adjacent module unit about during multilayer equipment and between the adjacent wall wallboard of adjacent module unit about and the connecting steel plate, and insert connecting bolt in the bolt hole between the adjacent wall wallboard of adjacent module unit about and the connecting steel plate, set up insulating washer between connecting bolt's both ends and corresponding wall wallboard and the connecting steel plate, fix with the nut at last.
10. The construction method according to claim 9, further comprising the steps of:
s60: after the box plate steel structure building is assembled, a sacrificial anode cathodic protection system is installed around the connecting part of the bottom enclosure wall board and the foundation, the sacrificial anode is embedded in a position which is 3-5m away from the bottom enclosure wall board of the box plate steel structure building and 1m below the ground, chemical fillers are filled around the sacrificial anode, and the sacrificial anode is electrically connected with a stiffening steel plate of the bottom enclosure wall board through a confluence cable.
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