CN108951859B - Building steel structure composite node adopting CrNiMn high-alloy welding material and cast-weld structure - Google Patents
Building steel structure composite node adopting CrNiMn high-alloy welding material and cast-weld structure Download PDFInfo
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- CN108951859B CN108951859B CN201810964165.9A CN201810964165A CN108951859B CN 108951859 B CN108951859 B CN 108951859B CN 201810964165 A CN201810964165 A CN 201810964165A CN 108951859 B CN108951859 B CN 108951859B
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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
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
- E04B1/2403—Connection details of the elongated load-supporting parts
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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
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
- E04B1/2403—Connection details of the elongated load-supporting parts
- E04B2001/2406—Connection nodes
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- Physics & Mathematics (AREA)
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
The composite node of the building steel structure is constructed by adopting CrNiMn high-alloy welding materials and cast welding. The invention solves the problems that the weldability between two steel components made of different materials such as cast steel and hot rolled steel is not ideal, the construction process for welding dissimilar steel is complex, and the quality hidden danger of a welding joint is easily generated during field installation welding construction. The free ends of the cast steel body member joints and the corresponding structural main body extension members are arranged in the same size with the cross section outline of the corresponding structural main body extension members, and the structural main body extension members and the structural main body members are arranged in the same material. The invention converts the dissimilar steel welding connection process between the cast steel joint body member and the structural main body member in the field steel structure installation construction into the butt welding of the structural steel members with the same material between the structural main body member and the structural main body extension member.
Description
Technical Field
The invention relates to a cast steel node of a building steel structure, in particular to a composite node of the building steel structure, which adopts CrNiMn high-alloy welding materials and cast-weld structures, and belongs to the technical field of the building steel structure.
Background
The steel structure has the advantages of high strength, good toughness, good anti-seismic performance, high construction speed and the like, is very suitable for the requirements of modern engineering structures on high-rise, large-span and heavy-load development, and has increasingly more engineering applications. In the development process of space structures, the application of the connection nodes of steel structures is becoming wider. With the improvement of casting technology, cast steel nodes are increasingly widely applied in China. The cast steel node is generally formed by integral casting, the node form is flexible, and the working performance is safe and reliable. Compared with the traditional welding joint form (such as steel pipe intersecting joint and the like), the cast steel joint avoids the collection of a plurality of welding seams of the welding joint at the joint, and meanwhile, the welding seam can be arranged at a position far away from the core area of the joint, so that the stress of the welding seam is reduced, and the stress performance of the structure is improved.
Meanwhile, the connection method of the cast steel node body component and the structural main body component and the process technology thereof are concerned. The method for connecting the cast steel node of the steel structure with the main body component is most common in the welding connection. In the field installation and construction of a common steel structure, the butt joint port of the cast steel joint body and the main body member is mainly in a geometrical shape such as a circular, rectangular or special-shaped structure, namely, the cast steel joint is not really in a welded joint form such as 'pipe butt joint' or 'plate butt joint'. The cast steel node material of the steel structure is common in cast steel series for welded structures such as G20Mn5, ZG275-485H and the like. The carbon equivalent is relatively high (mainly calculating the carbon content of the element to be 0.17-0.25%), and the supply state is casting and hot. The main body member of the steel structure is usually made of low-alloy structural steel series such as Q345, Q390, Q420, Q460 and the like, the carbon equivalent is relatively low (the carbon content of the main calculated element is generally less than or equal to 0.20%), the supply state is rolling or rolling plus heat treatment, so the two materials have different microstructures, different crystal grain sizes, different weldability, relatively poor weldability of cast steel and relatively good weldability of rolled steel.
In the assembly welding construction between the cast steel node and the main body component of the steel structure, because the cast steel and the rolled steel of the two steel components have large differences of carbon equivalent and metal microstructures, the mutual weldability is not ideal, the construction process of 'dissimilar steel welding' is relatively complex, and the quality hidden trouble of a welding joint is easy to generate. Especially, under the condition of on-site installation welding construction, the technical indexes of the integral strength, rigidity, toughness and plasticity, fatigue performance and the like of the butt joint are more easily limited and influenced by a plurality of factors such as welding materials, welding positions, on-site environments, heat treatment means and the like when the dissimilar materials of the cast steel joint body member and the structural main body member of the building steel structure are assembled and welded, the welding construction difficulty is aggravated as a final result, and the comprehensive process cost of the building construction is also improved.
In summary, the comprehensive technological level of dissimilar steel welding of cast steel node body members and structural main body member pairs and how to ensure the performance of high-quality 'dissimilar steel' welded joints have become one of the technical bottlenecks that actually affect the rapid development of space structures, and a connection structure of a large-sized cast steel node and a steel member is disclosed in a patent document with a patent name of 'a connection method and a structure of a large-sized cast steel node and a steel member' of the prior application No. 201210058101.5, and specifically discloses the following contents, including a cast steel node and a steel member, wherein the cast steel node is welded with the steel member through a transition section, and the ratio of the wall thickness of the cast steel node to the wall thickness of the steel member is 3: 1-4: 1, the wall thickness of changeover portion and cast steel node link is 75-85% of cast steel node wall thickness, and changeover portion and steel member link are equipped with 1: 2.5-1: 3.5, slope port wall thickness equal steel member's wall thickness, the structure can solve and can produce great step when big wall thickness cast steel node and small wall thickness steel casting carry out welded weld seam department, the welding seam width increases, welding residual stress increases, welding deformation increases, the welding degree of difficulty increases, butt joint quality and installation accuracy are all difficult to control, the unsatisfactory problem of appearance shaping, but still can't effectively solve the weldability between the steel member of two kinds of materials of cast steel and hot rolled steel ideal inadequately, there is the problem that the construction technology of xenogenesis steel welding is complicated and easily produces welded joint quality hidden danger during the welding construction of field erection.
Disclosure of Invention
The invention aims to solve the problems that the weldability between two steel members made of cast steel and hot rolled steel is not ideal, the construction process for welding dissimilar steel is complex, and the quality hidden danger of a welded joint is easy to generate during field installation welding construction, and further provides a composite node of a building steel structure adopting a CrNiMn high-alloy welding material and a cast-weld structure.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the building steel structure composite node of the cast-weld structure comprises a plurality of cast-steel body member joints 1-1 and a plurality of structure body extension members 1-2, wherein the number of the cast-steel body member joints 1-1 and the number of the structure body extension members 1-2 are equal, the free end of each cast-steel body member joint 1-1 is welded with the corresponding structure body extension member 1-2 into a whole, the outer contour size of the cross section of each cast-steel body member joint 1-1 is the same as that of the corresponding structure body extension member 1-2, and the material of the structure body extension member 1-2 is the same as that of the corresponding structure body member.
Further, the length range L of the extension member 1-2 of the structure body is 250-500 mm.
Further, the free end of each cast steel body member joint 1-1 is provided with a welding groove.
Further, the structural body extension member 1-2 is a circular steel pipe member, a rectangular steel pipe member, an H-shaped cross-section member, an i-shaped cross-section member, or an end plate connection member.
Furthermore, the building steel structure composite node also comprises a joint gasket 2-2, and the joint gasket 2-2 is embedded in the joint of the cast steel body member joint 1-1 and the structure main body extension member 1-2.
Compared with the prior art, the invention has the following beneficial effects:
the building steel structure composite node of the cast-weld structure is characterized in that a structure main body extension member made of the same material as a structure main body member is welded on a cast steel body member in advance, namely, the process of 'dissimilar steel welding' is digested in the factory condition stage of the manufacture of the cast steel node, and the quality reliability of a dissimilar steel welding joint can be improved;
compared with the existing welding process material, the welding deposited metal of the invention has better strength, plasticity and toughness reserve, and can ensure that the welding joint has excellent comprehensive mechanical property and integral rigidity and stability of a welding structure under the premise of supporting the design principle of the strength of a steel structure and having better bearing capacity, thereby being beneficial to ensuring the long-term service performance of the building steel structure, and particularly ensuring the fatigue failure resistance of a bridge structure and other dynamic load conditions;
the method converts the dissimilar steel welding connection process between the cast steel node body member and the structural main body member in the original site steel structure installation construction into the butt welding of the structural steel member with the same material between the structural main body extension member and the structural main body member;
the invention not only facilitates the field installation of the building steel structure and reduces the construction cost, but also reduces the quality hidden trouble of the dissimilar steel welding joint to the maximum extent, and is safer, better and more efficient; meanwhile, the cost performance of the cast steel node product is improved.
Drawings
FIG. 1 is a schematic view of a composite node of a construction steel structure of a cast-weld construction of the present invention (before welding);
FIG. 2 is a schematic view of a composite node of a construction steel structure of the cast-weld construction of the present invention (after welding);
FIG. 3 is a cross-sectional view (one of the cases) of butt welding the cast steel member body 1-1 and the main body extension member 1-2 in the fourth embodiment of the present invention.
Detailed Description
The first embodiment is as follows: as shown in FIGS. 1 to 3, the building steel structure composite node of cast-on-cast structure of the present embodiment includes a plurality of cast-on-steel body member joints 1-1 and a plurality of structural body extension members 1-2, the number of the cast-on-steel body member joints 1-1 and the number of the structural body extension members 1-2 are equal, the free end of each cast-on-steel body member joint 1-1 and the corresponding structural body extension member 1-2 are butt-welded to form a single body, the thickness of the free end of each cast-on-steel body member joint 1-1 and the corresponding structural body extension member 1-2 is not equal, but it is generally required that the cross-sectional outer contour dimension of each cast-on-steel body member joint 1-1 and the cross-sectional outer contour dimension of the corresponding structural body extension member 1-2 are equal, and the material of the structural body extension member 1-2 and, The geometry and dimensions are arranged the same.
In order to simplify the welding construction process, the free end of each cast steel body member joint 1-1 and the cross section of the corresponding structure main body extension member 1-2 are the same in shape, and the outer contour dimension is the same or close to the outer contour dimension; the plate thickness is the same or close to set up.
According to the technical conditions of the materials of the steel casting and the structural component, the welding materials which are traditionally selected and matched are common low-alloy structural steel welding materials such as an ordinary E5015 manual welding electrode or an ER50-6 gas shielded welding wire and the like so as to meet the welding strength requirement of equal-strength design of the assembly of the cast steel node and the structural component (such as a pipe fitting and the like); because cast steel and rolled steel components made of two different base metal materials have larger difference of carbon equivalent and metal microstructure, and have unsatisfactory weldability, the welding heat treatment process and measure requirements corresponding to 'dissimilar steel welding' need to be ensured so as to avoid welding cracks, and thus, better mechanical properties of joints are obtained.
The dissimilar steel welding material between the cast steel body member joint 1-1 and the structure main body extension member 1-2 is optimized into the special austenitic stainless steel welding wire of the CrNiMn main alloy system, which is more suitable for dissimilar steel welding between cast steel and rolled steel, and the special welding wire has the following grades: h08Cr20Ni10Mn7Si-ZG to better replace the original common structural steel welding material (namely ER50-6 in GB/T8110). Compared with the prior art, the special welding wire for welding the deposited metal has more excellent strength, plasticity and toughness reserves: the mechanical properties of the welding deposited metal are that the tensile strength Rm is more than or equal to 600N/mm2, the elongation A after fracture is more than or equal to 30 percent, the average impact absorption energy reaches about 90J under the condition of 40 ℃, and the welding joint has excellent comprehensive mechanical properties, the integral rigidity and the stability of a welding structure under the premise of supporting the strength design principle of a steel structure and having better bearing capacity, and is favorable for ensuring the long-term service performance of the building steel structure (particularly the anti-fatigue failure capability under the dynamic load condition of a bridge structure and the like). The welding material is used as a chromium-nickel-manganese high alloy, and the structure at room temperature is mainly austenite; and through the combined action of nickel-manganese alloying, the nickel-manganese alloy has more remarkable hydrogen and carbon dissolving capacity, and can remarkably reduce the crack sensitivity of weld metal and a fusion zone thereof. Under proper conditions, pre-welding preheating and post-welding heat treatment are not needed, and the welding construction process is further simplified.
The invention relates to a composite node of a building steel structure constructed by adopting a CrNiMn high-alloy welding material and a cast-weld process, which is characterized in that aiming at the connection between a cast-steel member body 1-1 and a structure main body extension member 1-2, a relatively complex dissimilar steel member butt-joint welding procedure is completed in a factory stage, and the CrNiMn high-alloy welding material is adopted for welding so as to ensure various mechanical properties of a high-quality dissimilar steel welding joint.
The second embodiment is as follows: as shown in FIGS. 1 to 3, the length L of the extension member 1-2 of the main body of the present embodiment is set to 250 to 500 mm. The design is carried out so as to meet the welding specification requirement that the minimum distance between adjacent butt welding seams on the same rod piece of the steel structure is more than or equal to 200 mm. Other components and connections are the same as those in the first embodiment.
The third concrete implementation mode: as shown in fig. 1, the free end of each cast steel body member joint 1-1 of the present embodiment is provided with a welding groove. By the design, welding is convenient to perform and the quality of the welding seam 2-1 is ensured. Other components and connection relationships are the same as those in the first or second embodiment.
The fourth concrete implementation mode: as shown in fig. 1 and 2, the structural body extension member 1-2 of the present embodiment is a circular steel pipe member, a rectangular steel pipe member, an H-shaped cross-sectional member, an i-shaped cross-sectional member, or an end plate connection member. The design is adopted, and the welding device is used for welding with the corresponding steel structure main component on site. The various structural body extension members 1-2 may be round steel pipe members, rectangular steel pipe members, or other profiled steel members, all of which are one embodiment of the present invention. Other components and connection relationships are the same as those in the third embodiment.
The fifth concrete implementation mode: as shown in fig. 3, the composite node of the building steel structure according to the present embodiment may further include a joint gasket 2-2, and the joint gasket 2-2 is embedded in the joint of the cast steel body member joint 1-1 and the structural body extension member 1-2. By the design, the gasket welding can be adopted for facilitating welding and ensuring the quality of the welding seam 2-1. The other components and the connection relations are the same as those of the first, second or fourth embodiment.
The foregoing is illustrative of the present invention and is not to be construed as limiting the practice of the invention, and several simple deductions or substitutions may be made without departing from the spirit of the invention, and all specific welded joint forms including "tube butt" or "plate butt" are to be considered as falling within the scope of patent protection defined by the claims as filed with the invention.
Claims (5)
1. The utility model provides an adopt the compound node of building steel construction of CrNiMn high alloy welding material and cast joint structure which characterized in that: the building steel structure composite node comprises a plurality of cast steel body member joints (1-1) and a plurality of structure main body extension members (1-2), wherein the number of the cast steel body member joints (1-1) and the number of the structure main body extension members (1-2) are equal, the free end of each cast steel body member joint (1-1) is welded with the corresponding structure main body extension member (1-2) into a whole, the free end of each cast steel body member joint (1-1) is arranged in the same size with the cross section outer contour of the corresponding structure main body extension member (1-2), the material of the structure main body extension member (1-2) is arranged in the same size with the material of the corresponding structure main body member, the free end of each cast steel body component joint (1-1) and the corresponding structure main body extension component (1-2) are welded by adopting a special austenitic stainless steel welding wire of a CrNiMn main alloy system.
2. The composite node of the building steel structure adopting the CrNiMn high-alloy welding material and the cast-weld structure according to claim 1, which is characterized in that: the length of the extension member (1-2) of the main body is 250-500 mm.
3. The composite node of the building steel structure constructed by the CrNiMn high-alloy welding material and the cast-weld according to the claim 1 or 2, which is characterized in that: the free end of each cast steel body member joint (1-1) is provided with a welding groove.
4. The composite node of the building steel structure adopting the CrNiMn high-alloy welding material and the cast-weld structure according to claim 3, which is characterized in that: the structure body extension member (1-2) is a circular steel pipe member, a rectangular steel pipe member, an H-shaped member with a cross section, an I-shaped member with a cross section or an end plate connecting member.
5. The composite node of the construction steel structure adopting the CrNiMn high-alloy welding material and the cast-weld structure as claimed in claim 1, 2 or 4, wherein: the building steel structure composite node further comprises a joint gasket (2-2), and the joint gasket (2-2) is embedded in the joint of the cast steel body member joint (1-1) and the structure main body extension member (1-2).
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| CN201810964165.9A CN108951859B (en) | 2018-08-23 | 2018-08-23 | Building steel structure composite node adopting CrNiMn high-alloy welding material and cast-weld structure |
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| CN201810964165.9A CN108951859B (en) | 2018-08-23 | 2018-08-23 | Building steel structure composite node adopting CrNiMn high-alloy welding material and cast-weld structure |
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| CN108951859B true CN108951859B (en) | 2020-08-11 |
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| CN111996458A (en) * | 2020-08-28 | 2020-11-27 | 北京市建筑设计研究院有限公司 | New application of G10MnMoV6-3 cast steel material and building cast steel node |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE3023065A1 (en) * | 1980-06-20 | 1982-01-07 | Bernhard Dipl.-Ing. 4250 Bottrop Küppers | Welded tubular bar lattice cast steel nodal connector - has truncated conical sockets arranged in diamond form |
| JPH0853881A (en) * | 1994-08-11 | 1996-02-27 | Tomoe Corp | Joint structure of steel pipe truss |
| CN102259166B (en) * | 2011-07-15 | 2013-01-02 | 洛阳双瑞特种装备有限公司 | Technical method for sand mould modelling for hollow sphere building cast steel node |
| CN102808455A (en) * | 2012-03-07 | 2012-12-05 | 中建四局安装工程有限公司 | Connecting method and connecting structure of large cast steel node and steel component |
| CN202831238U (en) * | 2012-09-19 | 2013-03-27 | 四川凯能机电设备制造有限公司 | Steel casting joint |
| CN103495793A (en) * | 2013-10-09 | 2014-01-08 | 永升建设集团有限公司 | Improved construction method for hoisting and welding large-tonnage cast steel component complex joints |
| CN103993244B (en) * | 2014-05-28 | 2017-05-17 | 北京京城环保股份有限公司 | Low-alloy cast steel joint as well as smelting and pouring control method and heat treatment process thereof |
| CN104148819A (en) * | 2014-07-14 | 2014-11-19 | 天津大学 | Welding method and welding joint for butt weld of cast steel pipe and hot rolled steel pipe |
| CN205012472U (en) * | 2015-08-12 | 2016-02-03 | 江苏永益铸管股份有限公司 | Novel cast steel joint |
| CN106881540A (en) * | 2015-12-16 | 2017-06-23 | 海宁瑞奥金属科技有限公司 | A kind of nickel-base alloy, wlding |
| CN108222265A (en) * | 2018-01-16 | 2018-06-29 | 中厦建设有限公司 | A kind of multidirectional super large steel reinforced concrete conversion layer node construction engineering method |
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