CN101435225A - Hollow steel node for connecting steel pipe columns of different shapes - Google Patents
Hollow steel node for connecting steel pipe columns of different shapes Download PDFInfo
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- CN101435225A CN101435225A CNA2008102393847A CN200810239384A CN101435225A CN 101435225 A CN101435225 A CN 101435225A CN A2008102393847 A CNA2008102393847 A CN A2008102393847A CN 200810239384 A CN200810239384 A CN 200810239384A CN 101435225 A CN101435225 A CN 101435225A
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Abstract
The invention discloses a polyhedron cast steel conversion node, which is formed by a geometric space having a shape of a plurality of polygon steel walls (5). The edge number adopted by the cast steel node geometric structure is corresponding to the geometric edges of connected pillars; the upper port section of the cast steel node is corresponding to the shape of the connected component; the lower port section of the node is corresponding to the shape of the connected component; the upper end of the polyhedron cast steel node is provided with a horizontal stiffening rib (3), the lower end is provided with a horizontal stiffening rib (4) for bearing the horizontal component force generated by inclined sidewall, and the longitudinal section of the cast steel node is provided with a longitudinal stiffening rib (1) for improving the stability of the sidewall of the cast steel member. The conversion node steel cast member of the invention determines the wall thickness according to the principle that the cast steel node and the adjacent upper polygon surface component have same intensity. The wall thickness can change correspondingly at different cast steel nodes. The welding place of the cast steel member and the component is provided with a notch, which guarantees effective connection and transmission internal force.
Description
Technical field
The present invention relates to a kind of node of the application in a kind of construction steel structure field, particularly a kind of hollow node of cast steel that can connect steel pipe columns of different shapes.
Background technology
The cast steel node design still belongs to the starting stage in China, also there is a big difference compared with developed countries, particularly in recent years, along with the complexity of the increasing of the increase of structural span, form, moulding, this node more and more received the concern of engineering circle with its reasonability and applicability.In the spatial steel structure design of node, we can meet such as welded hollow spherical joints, bolted spherical node, round steel pipe or node forms such as box steel pipe tubular joint, welding steel node.But along with the continuous appearance of new structure system, make in the structure node connected mode between the member and member increasingly sophisticated, forms such as traditional steel pipe tubular joint and solder ball node can not adapt to the development of Modern Steel Structure.In order to make structure design satisfy the requirement of architectural image, proposed how to realize the reasonable transition between the difformity member, when realizing the different cross section conversion, node removes must have enough strong rigidity, the requirement of the satisfying bearing capacity simple structure of also should trying one's best outward, form is attractive in appearance.Just to adopting which type of joint form to propose requirement, traditional node mostly is sphere nodes for this, and sphere nodes can not well solve the transfer problem between the different cross section.This has just proposed the joint form of multiaspect build, and the polyhedron node not only can solve the problem of cross section conversion but also comparatively simple, attractive in appearance.Realize that the polyhedron switching node can adopt two kinds of forms, welding and casting.If but adopt the node that is welded by the polylith steel plate, the situation that many weld seams cross will appear inevitably, for fear of the junction of weld seam between a large amount of plates, adopt cast steel node will improve the making difficulty of complex node, the problems such as high residual stress of the weld seam that crosses.And cast steel node has its unique advantages energy: cast steel node is integral cast in factory, with respect to welding node and steel pipe tubular joint, can remove the stress that intersection cuts and the welding of overlapping weld seam causes from and concentrate; Cast steel node has flexible adaptability, and the design of node degree of freedom is big, can produce the node with complex appearance and inner chamber according to the building needs; Can adopt reasonable sectional by force-bearing situation, thereby improve the stress distribution of node; Be not subjected to the restriction of node location, shape, size, both can be used for structure middle part node, can be used for support node yet.That cast steel node can be made is solid, semi-hollow and hollow three kinds of joint forms, and the cast steel node form that therefore has good applicability more and more is subjected to the favor of engineering circle.For fear of the deficiency that welding node exists, adopt the hollow cast steel node of polyhedron shape to realize that the conversion in difformity cross section has good applicability and reasonability.
Summary of the invention
Technical problem to be solved by this invention is the conversion that realizes between the different polygonal cross-section posts, can connect difform steel pipe column up and down, and satisfies the requirement of stressed reasonable, easy to process, good looking appearance.Make its node stability that has of one's own and bearing capacity height, economical with materials greatly.
In order to achieve the above object, the present invention has adopted following technical scheme:
The present invention adopts the polyhedron contour structures, and the pillar connecting portion mainly stressed with upper and lower end is opening.Node steel-casting Wall thickness Determination is mainly according to strong principles such as cast steel node and adjacent upper polygonal member.Can change accordingly at different parts cast steel node wall thickness, to realize economy, stressed reasonability.
Aforesaid node is made up of the geometric space of several polygon steel walls 5; The limit number that described cast steel node geometric configuration adopts, corresponding with the geometrical edge number of institute connection pillar; Described cast steel node upper port cross section is corresponding with the member shape that is connected; The cross sectional shape at its node lower port place is corresponding with the member shape that is connected; In described polyhedron cast steel node upper end horizontal stiffening rib 3 is set, its lower end is provided with the horizontal stiffening rib 4 of the horizontal component of bearing the sloped sidewall generation, and the longitudinal stiffener 1 that improves the steel-casting sidewall stability is set in the longitudinal cross-section of cast steel node
The horizontal stiffening rib 4 of horizontal stiffening rib 3 in aforesaid upper end and lower end is provided with hole 2.
Aforesaid steel wall 5) junction is chamfered between wall, and side seam is set simultaneously at steel-casting upper end open place and weld seam is filled at the back.
Polyhedron cast steel switching node of the present invention compared with prior art, has remarkable advantages and beneficial effect:
The present invention can avoid numerous welding nodes to concentrate in together, and simplifies joint form.Because it is the limit number that the cast steel node geometric configuration adopts, corresponding with the geometrical edge number of institute connection pillar; The upper port cross section is corresponding with the member shape that is connected; The cross sectional shape at its node lower port place is corresponding with the member shape that is connected; Guaranteed that outward appearance seems attractive in appearance, smooth.In the cast steel node upper end horizontal stiffening rib is set, its lower end is provided with horizontal stiffening rib, and longitudinal stiffener is set in the longitudinal cross-section, has guaranteed the resistance to overturning and the rigidity requirement of node.Switching node steel-casting of the present invention is determined wall thickness according to strong principle such as cast steel node and adjacent upper polygonal member.Can change accordingly at different parts cast steel node wall thickness.Satisfy the requirement of stress performance and can alleviate deadweight, saving steel.The weld of steel-casting and member is provided with notch, has guaranteed effective connection and transmission internal force.
Description of drawings
Fig. 1 is a polyhedron cast steel node schematic diagram;
Fig. 2 is a generalized section of the present invention;
Fig. 3 is A among Fig. 1-A generalized section;
Fig. 4 is B among Fig. 1-B generalized section;
Fig. 5 is C among Fig. 1-C generalized section.
Among the figure: 1-longitudinal stiffener, 2-hole, the horizontal stiffening rib in 3-upper end, the horizontal stiffening rib in 4-lower end, 5-polyhedron cast steel wall.
The specific embodiment
Be described in further detail below in conjunction with the enforcement of accompanying drawing the cast steel node structure:
See also shown in Figure 1ly, be polyhedron cast steel node schematic diagram; As can be seen from the figure, 1 is longitudinal stiffener, and 2 is hole, and 3 is the horizontal stiffening rib in upper end, and 4 is the horizontal stiffening rib in lower end, and 5 is polyhedron cast steel wall.
Fig. 2 is the generalized section of polyhedron cast steel node, and Fig. 3 is A among Fig. 1-A generalized section, and Fig. 4 is B among Fig. 1-B generalized section, and Fig. 5 is C among Fig. 1-C generalized section.
As shown in FIG., polyhedron cast steel switching node is made up of for the geometric space of several polygon steel walls 5 profile; The limit number that the cast steel node geometric configuration adopts, corresponding with the geometrical edge number of institute connection pillar; Described cast steel node upper port cross section is corresponding with the member shape that is connected; The cross sectional shape at its node lower port place is corresponding with the member shape that is connected; In polyhedron cast steel node upper end horizontal stiffening rib 3 is set, its lower end is provided with the horizontal stiffening rib 4 of the horizontal component of bearing the sloped sidewall generation, and the longitudinal stiffener 1 that improves the steel-casting sidewall stability is set in the longitudinal cross-section of cast steel node.Horizontal stiffening rib 3 in upper end and the horizontal stiffening rib 4 in lower end are provided with hole 2.Steel wall 5, the junction is chamfered between wall, and side seam is set simultaneously at steel-casting upper end open place and weld seam is filled at the back.
The wall thickness of cast steel node should not be crossed thin also unsuitable blocked up, crosses thin the entering in the chamber of molten steel uniform and stable of can not guaranteeing, blocked up cast steel will cause the waste of steel.For the horizontal component event of bearing the sloped sidewall generation all is provided with horizontal stiffening rib 4 in the upper and lower end of polyhedron cast steel node,, improve the rigidity of cast steel node to guarantee the resistance to overturning of sidewall.Consider that part cast steel node yardstick is bigger, the member wall thickness is thinner relatively, also longitudinal stiffener 1 should be set, design during longitudinal stiffener 1 except that considering joint structure characteristics and stress performance requirement, also should be in conjunction with the casting technique requirement, the assurance MOLTEN STEEL FLOW is smooth and easy, and inside and outside heat radiation is even, effectively avoids the cast steel node internal flaw.
Between cast steel node sloped sidewall and the vertical sidewall, it is smooth and easy that node inwall and outer wall will adopt chamfering to make that internal force transmits, and when avoiding stress to concentrate, also has the good surface appearance effect.Take all factors into consideration that scarfing cinder in the casting engineering requires and the requirement of field Welding, can at the horizontal stiffening rib of upper and lower end place hole 2 be set respectively.
Steel-casting and being connected of adjacent members are important steps in the cast steel node design.Owing to answer dynamics higher, the intensity of member steel should be higher than cast steel material, so the steel-casting wall thickness is generally greater than the wall thickness of member.If steel pipe and steel-casting are directly welded, certainly will produce bigger welding stress herein, internal force evenly transmits between Materials with High Strength and the low strong material in order to make, and avoids producing the stress raisers phenomenon, so will do the welding notch at the weld of cast steel node and steel pipe.If can directly the cast steel wall thickness be smoothly transitted into suitable wall thickness when the wall thickness of cast steel node and steel pipe is more or less the same with steel pipe, will be on steel-casting when if cast steel wall thickness and steel pipe differ big end interface side seam is set simultaneously fill weld seam with the back, with the higher stress in the assurance steel member can effectively be diffused as in the steel-casting than low stress.For the lower port of polyhedron steel-casting,,, steel-casting lower port and member get final product so only being provided with side seam because stress is lower.
According to technical scheme of the present invention, it is as follows to specify its preparation method:
1) at first carries out node profile and structure design: is connected sectional dimension, position, intensity and the architectural image of pillar according to the upper and lower side that is connected with this invention, determines upper opening shape and big or small, the lower openings shape and the size of cast steel node.Height of this node (length) and wall thickness, wall thickness will guarantee that this node has sufficient intensity, take into full account casting technique and height, in conjunction with the node profile, take all factors into consideration node weight.Determine chamfer radius size between the steel wall, node welding junction form and whether stiffening rib is set and stiffening rib position, size and the calculating of steel wall thickening degree etc., and reserve enough big welding space.
2) select cast steel: have superperformance in order to ensure cast steel node, the chemical composition of strict control of material, especially note guaranteeing the solderability of steel-casting.At present, the material of this node is selected mainly with reference to DIN.Select for use GS-20Mn5V to smelt.
3) modelling: this step is the committed step of node casting, should strict size, angle and the finish of controlling the model each several part in the modelling process.The present invention selects wooden form for use, and the requirement of the making of wooden model is very high, and the particularly detection of angle for this reason, can be adopted quadrature flat projection method, by measuring, forms three-dimensional system of coordinate, and the size and the angle of wooden model and subsequent foundry goods (node) are accurately measured.Carry out formwork according to surveying size.Attention guarantees the quality and the fineness of template surface when formwork, and considers the problem on deformation of wooden form.
4) formative technology: node adopts phenolic sand molding technology, and resin self-setting sand casting dimensional accuracy is higher, and surface quality is better.Because the node volume is big, local thermal center is big, and sand, control moulding-sand property are joined in strict control in the production, improve surface stability.The sand mold surface is dried before the mould assembling, blow off loose sand in the die cavity, guarantee that cast gate, venthole are unimpeded; After the mould assembling, watering, adding cover plate on the rising head and enter die cavity to prevent sand.Control stripping time.
5) smelt: smelting process control comprises early stage dephosphorization operation of melting stage; Guarantee the time of decarburized amount and decarbonization rate and clean boiling the heat of oxidation; Reduction period guarantees the white slag time, utilizes spectroanalysis instrument that the finished product sample is carried out the chemical composition check, adopts electric arc furnace smelting, stirs refining techniques by gases such as Argons, improves the product mechanical performance.
6) cast: the cast of molten steel will guarantee that into the molten steel of people's die cavity is steady, and the suitable rate of climb is arranged, and vortex phenomenon do not occur.For thinner thickness position in the foundry goods, molten steel should be watered time, in case occur the cavity behind the molten steel solidification, have a strong impact on the stress performance of node.For fear of wedge angle occurring and help sand removal, the inside and outside wall between each foundry goods of cast steel node is rounding off, promptly designs chamfering.
7) modified heat treatment: because there is certain fluctuation in the chemical composition of every stove smelting metal, therefore need adjust heat treatment parameter, to guarantee the mechanical performance of steel-casting according to the composition of different foundry goods.Make the same stove of foundry goods of same smelting heat during shove charge as far as possible, will level up foundry goods during shove charge, prevent the product distortion.Steel-casting should strictly be held heating, be incubated and cool off three links in modified process, rationally determine heat treatment process parameter.Gap between foundry goods and foundry goods, foundry goods and the body of heater will guarantee, makes foundry goods each several part thermally equivalent, cooling.Cooling velocity during quenching is very big to the material property influence, and therefore the pool volume to quenching usefulness proposes to be strict with, with the control quench cooling rate.
8) contraposition welding: adopt the notch welding procedure when this engineering is connected with adjacent members the upper and lower port of steel-casting, the upper opening position adopts level and back to fill weld seam, and lower openings adopts the horizontal welding welding seam.
The quality control of cast steel node: for guaranteeing the quality of cast steel node, in the production of node and installation process, mainly carry out the detection of following several respects:
1) should carry out the strictness check to its chemical composition, and corresponding chemical composition report is provided.
2) the foundry return water that will water steel-casting is made standard specimen, carries out mechanical properties test, and the mechanical performance report is provided.
3) foundry goods is carried out nondestructive inspection and detect, method is mainly magnetic powder inspection and radiographic inspection.
4) with three coordinates measuring equipment the physical dimension and the locus of cast steel node are detected, and on steel-casting, marked position line, be beneficial to the installation of node according to measurement result.
5) the node surface defective that do not influence functional performance allows to carry out soldering, reparation, but does not allow soldering when having honeycomb-like pores.
The force analysis of cast steel node: the computational methods of cast steel node mainly adopt Finite Element, utilize large-scale general finite element program ANSYS, NASTRAN, COSMOS etc. to carry out force analysis.When carrying out finite element analysis, because the wall of cast steel node is thicker relatively, cell type selects solid element usually, carries out elasticity or plastic analysis according to the yield strength of cast steel.Those stressed cast steel nodes big, complex structure are necessary to carry out the experimental study of full size test specimen or scale model.Because cast steel has plasticity preferably, the criterion of strength of cast steel node adopts the VonMises equivalent stress, and promptly the Mises stress when calculation level surpasses the strength of materials, thinks that this point enters plasticity.
Claims (4)
1, a kind of hollow steel node that connects steel pipe columns of different shapes, the geometric space of forming for several polygon steel walls (5) by profile; The limit number that the cast steel node geometric configuration adopts, corresponding with the geometrical edge number of institute connection pillar; Cast steel node upper port cross section is corresponding with the member shape that is connected; The cross sectional shape at its node lower port place is corresponding with the member shape that is connected; It is characterized in that:
At the pillar that described polyhedron hollow steel node connected is the interface dimensions of upper end column cross-section size less than following newel post, and the upper end is provided with horizontal stiffening rib (3), its lower end is provided with the horizontal stiffening rib (4) of the horizontal component of bearing the sloped sidewall generation, and the longitudinal stiffener (1) that improves the steel-casting sidewall stability is set in the longitudinal cross-section of cast steel node.
2, according to the hollow steel node of the described connection steel pipe columns of different shapes of claim 1, it is characterized in that: the horizontal stiffening rib of horizontal stiffening rib in described upper end (3) and lower end (4) is provided with hole (2).
3, according to the hollow steel node of the described connection steel pipe columns of different shapes of claim 1, it is characterized in that: described steel wall (5), the junction is chamfered between wall, and side seam is set simultaneously at steel-casting upper end open place and weld seam is filled at the back.The steel-casting lower port adopts side seam.
4, according to the hollow steel node of the described connection steel pipe columns of different shapes of claim 1, it is characterized in that: the one casting is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102393847A CN101435225A (en) | 2008-12-12 | 2008-12-12 | Hollow steel node for connecting steel pipe columns of different shapes |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102393847A CN101435225A (en) | 2008-12-12 | 2008-12-12 | Hollow steel node for connecting steel pipe columns of different shapes |
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| CN101435225A true CN101435225A (en) | 2009-05-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008102393847A Pending CN101435225A (en) | 2008-12-12 | 2008-12-12 | Hollow steel node for connecting steel pipe columns of different shapes |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102259166A (en) * | 2011-07-15 | 2011-11-30 | 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 |
| CN103174222A (en) * | 2013-03-11 | 2013-06-26 | 同济大学 | Steel casting modularization panel point for connection of steel pipe column and H-shaped beam |
| CN108661174A (en) * | 2018-07-27 | 2018-10-16 | 中铁建设集团有限公司 | Discontinuous Section Column switching node and its method of construction |
-
2008
- 2008-12-12 CN CNA2008102393847A patent/CN101435225A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102259166A (en) * | 2011-07-15 | 2011-11-30 | 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 |
| 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 |
| CN103174222A (en) * | 2013-03-11 | 2013-06-26 | 同济大学 | Steel casting modularization panel point for connection of steel pipe column and H-shaped beam |
| CN108661174A (en) * | 2018-07-27 | 2018-10-16 | 中铁建设集团有限公司 | Discontinuous Section Column switching node and its method of construction |
| CN108661174B (en) * | 2018-07-27 | 2023-08-08 | 中铁建设集团有限公司 | Discontinuous section column conversion node and construction method thereof |
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Open date: 20090520 |