CN108265865B - A kind of steel joist chaining part - Google Patents

Abstract

The present invention provides a kind of steel joist chaining parts, which is characterized in that the steel joist chaining part includes first part and second part, and first part and second part are flexibly connected.The steel joist chaining part fixation, it is easy for installation, and preferably, different materials are used for different piece intensity requirement, while ensuring that fastening is installed, are reduced costs, and by the shape for adjusting mounting hole, certain damping of shocks can be obtained, there is biggish safety redundancy.

Description

A kind of steel joist chaining part

Technical field

The invention belongs to curtain wall technology field, the keel chaining part technical field for curtain wall is particularly belonged to, one kind is related to Steel joist chaining part.

Background technique

With the rapid development of society, urban architecture largely uses curtain wall technology.Current society is able to satisfy as one People are to the aesthetic measure of construction project and the comprehensive construction project of safe coefficient for meeting, and curtain wall technology is worth being concerned, such as Fruit during construction, curtain wall technology in quality problems in the event of any problem, then for the building work of curtain wall For journey, the safety of building will be leveraged, more no longer needs to the aesthetic measure for talking curtain buildings.For curtain wall quality It says, the design and quality of the steel chain fitting (that is, connector) in curtain wall have very important status and effect.

CN104763089A discloses a kind of keel connecting member comprising main connector and connection assist, the main company Fitting includes vertical support portion and transverse support portion, and the lower part of the vertical support portion is equipped with hook groove, the transverse support portion One end is fixedly connected with the upper end of the vertical support portion, and articulated section, the auxiliary are additionally provided with above the transverse support portion Connector includes articulation piece and fastener, and the articulation piece and the articulated section are hinged, under connection status, the fastener rotate to The vertical support portion is parallel.

CN105587062A discloses a kind of plug-in keel connecting member comprising connects part and the connection of clamping joist The part of triangular keel, characterized in that the keel connecting member is equipped with horizontal block, and the one pair of them side of horizontal block is respectively equipped with vertical Straight upward vertical block, the upper end of vertical block bend inwards, and form the card slot being adapted to the tongue and groove of clamping joist；Another pair of horizontal block While being respectively equipped with a pair of mounting block bent downward, the three of adaptation triangular keel cross-sectional shape is formed between every a pair of of mounting block Wall angle mounts slot.

CN103114673B discloses a kind of split type keel connecting member comprising identical two connection sheets of structure, institute The top for stating connection sheet is equipped with the upper clamping groove of clamping keel, and the bottom of the connection sheet is equipped with the lower clamping groove of clamping keel, It is equipped with card adapter plate and bayonet in the middle part of the connection sheet, is oppositely arranged between two connection sheets and by card adapter plate and bayonet cooperation card Connect fixation.

CN103643781B discloses indoor wall, ground decoration keel connecting member comprising U-shaped component, the U-shaped component It is made of bottom plate and riser, bottom plate and riser are mutually connected vertically；Riser notch is symmetrically opened up at the middle part of two pieces of risers, and It is equipped with and the orthogonal connecting plate of riser at riser notch edges；It is equipped on the connecting plate and riser and is connected and fixed hole.

CN203569783U discloses a kind of anticreep keel connecting member, it includes right-angle connector, keel set access slot, connection Part removal hole, anticreep keel, the both ends of the right-angle connector are provided with keel set access slot, are socketed on keel set access slot anti- Keel are taken off, are provided with connector removal hole on right-angle connector.

CN104294976B discloses a kind of dry hanging curtain wall connector, which includes back of the body bolt and bolt-lock, the back Bolt includes clamping portion, and the bolt-lock includes protecting frame and the openable and closable card pick up cooperation agency in protecting frame, the card Connecing matching mechanism includes upper lip part, lower lip part and two shafts, and the upper lip part is rotatablely connected by shaft and protecting frame, on this Lip part is formed by overlapping a plurality of strips, and the front end of part slip is equipped with the gib head being cooperatively connected with clamping portion, and the lower lip part is logical It crosses shaft and protecting frame is rotatablely connected, which is formed by overlapping a plurality of strips, and the front end of part slip is equipped with and clamping portion The gib head of mating connection.

JP 2014074164 discloses a kind of connector, which will distinguish plate-like female part and male parts At least part is overlapped and is connected with each other, and female part includes the opening having with the engaged part of male parts；And band connection portion Or the linking part with one member, male parts include insertion opening and the engaging for having the holding section engaged with engaged part is dashed forward It rises；And band connection portion or the linking part with another party's component.

JP103597150A discloses a kind of connector, can be installed on C-type steel and be used for connection framework material wherein One end, the C-type steel has web, a pair of of the edge of a wing erected from the both ends of the web and distinguishes from each edge of a wing A pair of of the crimping be curved to the inside, the connector include: insertion section, can pass through each crimping to be specifically inserted into posture Between and be inserted between each edge of a wing；And interconnecting piece, it can be in the state that the insertion section be inserted between each edge of a wing Connect the frame material, wherein the insertion section has a pair of of abutting part, which inserts in the insertion section from described Under mounting position after entering posture rotation specified angle, it can be connected to the medial surface on two edges of a wing of the C-type steel respectively.

EP2014/069361A1 discloses a kind of method for manufacturing connector, and the connector is especially used for tower The connector of the steel construction of frame, wherein by blank by rolling technology manufacture flange on the flange single type connect outside Next shell wherein makes the profile of the end adaptation component opposite with the flange of the shell, the component should connect with shell It connects.

" a kind of cladding glass plate connector ", Pei Juan etc., urban construction theoretical research: electronic edition, 2013 (3): 240-240 discloses a kind of cladding glass plate connector and belongs to curtain wall connecting component technical field more particularly to a kind of curtain wall Glass plate connector.The connector of this cladding glass plate is that one kind is convenient for glass plate plane fitting and structure is simple Cladding glass plate connector.This connector includes pressing plate, and pressing plate is tight by first with the pressing plate card slot on the keel above it Firmware connection, the both ends of pressing plate are provided with upward protrusion, and protrusion is mutually squeezed with the secondary frame upper end lower surface above it, tie Structure requires the two sides of the pressing plate card slot to be provided with ball type of contact surface profile, and ball type of contact surface profile passes through the first adhesive tape and its The secondary frame upper end upper surface of lower section is connected；Secondary frame lower end surface is fixedly connected by structure glue with glass plate.

However, above-mentioned document and it is other in the prior art, keel chaining part be substantially it is fixed-type, be not activity Formula, further, in existing keel chaining part, the different piece intensity and load for not accounting for keel chaining part are wanted The difference asked all is entire chaining part using same material, this causes, and perhaps intensity is inadequate or waste of material.In addition, existing Have in technology, fixed form is single, there is the risk for being not connected firmly such as tripping.This field needs a kind of flexible for installation and energy Enough the safe and reliable steel joist chaining part targetedly reinforced is required for varying strength.

Summary of the invention

To solve the above problems, the present inventor passes through further investigation and a large number of experiments, and by multi-party cooperative research and development, it is comprehensive It closes and considers material performance requirement, it is combined with structure design, provides a kind of new steel joist chaining part, it can be simultaneously Solve above-mentioned technical problem.

With reference to Fig. 1 and 2, in one aspect of the invention, a kind of steel joist chaining part is provided, wherein the steel joist chaining part Including first part and second part, first part and second part are flexibly connected.

Preferably, the first part and second part are realized by pivot is flexibly connected.The pivot connection is preferably Rotation connection, can be, for example, hinge form.

Preferably, the steel joist chaining part is for linking together main joist and false keel.

With reference to Fig. 1 and 2, it is preferable that the first part is substantially plate-like, preferably has reinforce protrusion thereon, such as press Make the ribs formed.The second part is bent to form holding section close to one end of pivot.The holding section makes first Divide and second part can together engage keel to be mounted, especially false keel, such as part sandwiches, preferably three bread Folder.The width of the holding section is close to surround installation with the side equivalent width of false keel to realize false keel.Bending Part forms bending boundary line.The bending is preferably in 90 degree.Required bending angle, example can also be formed according to the shape of false keel Such as 60 degree, 45 degree.Due to the presence of the holding section, the side of the second part is preferably L-shaped.

Also refer to Fig. 1 and 2, it is preferable that the side of the first part has vertically extending first to laterally secure plate, institute State second part side have vertically extending second side to fixed plate, described first laterally secure plate and second side to Fixed plate is located at the opposite side of steel joist chaining part.Described first laterally secure plate and the second side be preferably placed to fixed plate it is separate The side at the both ends of pivot.Described first laterallys secure plate and second side is used to fix steel joist chaining part to fixed plate On main joist.So-called to extend vertically, those skilled in the art are it is understood that indicate to laterally secure plate and first part or second The subject plane divided is vertical.

For the present invention, it is preferable that refer to Fig. 1 and 2, described first laterallys secure plate and the second side has in fixed plate Have a fixation hole, the first fixation hole for lateralling secure on plate is corresponding with the fixation hole of main joist side, so as to by fixing bolt into Row is fixed；Fixation hole of second side in fixed plate is corresponding with the fixation hole of the main joist other side, so as to by fixing bolt into Row is fixed.During installation, it is preferably fixed on main joist by the fixing bolt.

In a preferred embodiment of the present invention, described first plate and second side are laterallyd secure to fixed plate use It is fixed on main joist in by steel joist chaining part.First, which laterallys secure plate and the second side, has fixation hole in fixed plate, point The two sides that mode is fixed on main joist are not consolidated by bolt.

Preferably, the steel joist chaining part is used for the connection of main joist and false keel, and the two sides of the main joist have There are two longitudinal slots to be formed that inwardly twist.It is highly preferred that the two sides (two sides) that described two longitudinal slots pass through main joist Inwardly twist or bend twice 90 degree of formation.It is of course also possible to which the camber that twists, forms the longitudinal slot of arc or semicircle.

Preferably, the end of the first part is formed with the first clamping portion, which can abut against main dragon The outside of two longitudinal slots of bone is to be stuck in the centre of main joist.

Preferably, the end of the second part is formed with the second clamping portion, and there are two protrusion, energy for second clamping portion tool It is enough connected in two longitudinal slots of main joist.It is highly preferred that the two sides of second clamping portion are respectively provided with a hook solid Protrusion, the protrusion stick into described two longitudinal slots.

Second clamping portion can effectively prevent longitudinal slot to be unfolded, to cooperate together with the first clamping portion to longitudinal slot Play extraordinary firm effect.

After installation is complete, main joist and false keel are in substantially vertical.

It is highly preferred that the first part and second part are made of different materials.It is further preferred that described first Part is made of aluminium alloy, and the second part is made of ferroalloy.

For the present invention, it is preferable that during installation, described first laterallys secure plate and the second side has in fixed plate Fixation hole, the first fixation hole for lateralling secure on plate is corresponding with the fixation hole of main joist side, for being consolidated by fixing bolt It is fixed；Fixation hole of second side in fixed plate is corresponding with the fixation hole of the main joist other side, for being fixed by fixing bolt. The fixing bolt is preferably bolt or anchor bolt.The fixing bolt and aforementioned first clamping portion, the second clamping portion can securely by Steel joist chaining part is fixed on main joist.This collaboration fixed form can prevent from falling off in higher load or Deformation.

The first part, second part (including the holding section formed on second part) can be by false keel snapping or cards It is buckled on main joist.

In the design of current curtain wall steel structure (including keel chaining part), require to comprehensively consider material property, no It is single structure design again.Curtain Wall Design, material selection need overall co-ordination with architectural design, how to realize rationally cooperation It is one of the multinomial challenge of curtain wall field face.For this purpose, the present inventor is designed and developed by cooperative research and development by a large number of experiments The reasonable alloy of described keel chaining part each section is constituted.

Preferably, the first part of the keel chaining part is made of high-strength aluminum alloy.The high-strength aluminum alloy packet Contain: by weight percentage, 3.0-5.0% Mg, 1.0-2.0% B, 0.5-1.5% Cu, 0.2-0.5% Zn, the Al of surplus.

The alloy can be made by following founding: the metal charge of the intermediate alloy of Mg and B and other metals is put Enter in smelting furnace and melt, the temperature of molten metal liquid is controlled at 600-750 DEG C, preferably 700 DEG C or so, under stiring in this Temperature is kept for 10-15 minutes, then uses argon gas degasification, and on surface, paving spills covering slag after standing 3-5 minutes, and slag-liquid separation is removed Slag is removed, aluminum profile is poured into, then the profile cooled to room temperature that will be cast into carries out ageing treatment, places later cold But to room temperature.

Preferably, the ageing treatment is that 6h is kept at 550 DEG C, then keeps 3h at 220 DEG C.

The intermediate alloy of the Mg and B is preferred are as follows: 85%Al-15%Mg, 95%Al-5%B, metal charge are Al ingot, Cu ingot and Zn Ingot.Ratio in the intermediate alloy is that by weight, this is art-recognized measurement unit.

In the smelting technology, Cu ingot is preferably first added, Zn ingot is added later, adds Al behind them completely melting Ingot.The addition sequence is conducive to form fine diffusing particle in the alloy, and this microstructure has high intensity.

In the alloy of the invention, while B and Mg is used, in ageing treatment, is capable of forming and helps to improve by force The precipitate of degree, to play age hardening capability, what wherein B made that the alloy obtains necessary intensity such as tensile strength must The element of palpus.If B content is too low, the precipitation object amount after ageing treatment is on the low side, and intensity is lower.On the other hand, if B content mistake Height is then easy to happen hot-rolled crackle in the manufacture of chaining part, and crystallization object is excessively thick, in addition will form precipitate shape, seriously Reduce machinability.

These described elements have the effect of jointly so that alloy has high intensity, they are the associations of the high intensity obtained Same element, such as since the presence of B, Cu can form tiny diffusing particle in ageing treatment, make alloy grain miniaturization from And improve intensity.

The highest tensile strength of aluminium alloy of the invention can achieve 300MPa or more, while elongation can achieve 6.2% More than, also, compared with general aluminium alloy, rare earth metal or other precious metals, production cost ratio are not used in this alloy It is lower.

This chaining part structure design of the invention is selected with alloy, compared with traditional steel joist chaining part, has lightweight And the higher feature of intensity.About the aluminium alloy, the applicant will separately carry out patent application simultaneously and be protected.

Preferably, the second part of the keel chaining part is made of high-strength iron alloy.With reference to Fig. 2, keel chaining part Second part due to being connect with main joist, and be usually by false keel clamping be lifted on main joist, be main load portion Point, therefore it is higher to intensity requirement.

Preferably, the composition of the high-strength iron alloy is as follows: with the total weight of the ferroalloy, C 1.0-3.0%, Si is 0.8-1.0%, Mn 0.6-0.7%, S 0.04-0.05%, V 0.15-0.25%, Ti 0.010-0.015%, Ni is 16.0-18.0%, and Ni/C molar ratio=6-10, surplus is iron and inevitable impurity.The intensity of the alloy also can Reach the 2 times or more of conventional use of commercially available linkage members alloy, test method can be carried out according to GB/T1591-2008.

The alloy can be refined according to conventional ferroalloy smelting method.The collocation of the alloy element, Neng Gouyou Effect reduces the amount of retained austenite, to more fully eliminate residual stress, the control of Ni and C ratio can be conducive to be precipitated super Subtle carbide improves abrasion resistance properties, the addition of Ti element is it is possible to prevente effectively from make to occur in metalwork so that hardness increases The relaxation of residualinternal stress, the defects of avoiding macroscopic cracking, to greatly improve the chaining part for example for curtain wall Reliability when structure.

Have in the first part of the chaining part in a particularly preferred embodiment of the invention with reference to Fig. 1 and 2 There is mounting hole, for chaining part and false keel to be fixedly mounted by clamp device, the shape of the mounting hole makes false keel exist It can be slid laterally with respect to main joist under certain effect power.The slidably distance is consistent with the length of mounting hole, essentially pacifies Fill the length in hole.For example, the mounting hole is rectangle or rectangle like (such as racetrack or ellipse) or platypelloid type.Mounting hole Length direction it is vertical with main joist, it is parallel with false keel length direction.

There are certain active redundancies to keel framework system for this design method.Use is pretended when encountering earthquake, typhoon etc. When power, the appropriate sliding of false keel allows keel framework system to have certain cushion space, constitutes effective buffer system, Avoid the issuable destruction of rigid system institute.Under normal circumstances, due to clamp device such as bolt or screw and installation Hole is tightly fastened, and will not be generated and be slid laterally.The clamp device can be a part of keel chaining part, that is, be typically configured in On keel chaining part, it is easily installed.The clamp device can fit on keel chaining part by the way that suitable mode is attached.

Generate the outer force threshold of the sliding by between clamp device and mounting hole clamping power or fastening force determine.In order to Realize the required clamping power of the present invention, the clamp device is preferably the external clamp device for being coated with plastic bushing, such as outer Portion is coated with the bolt or screw of plastic bushing.Preferably, the plastic bushing is high density polyethylene (HDPE).

The high density polyethylene (HDPE) is particularly preferably grafted with maleic anhydride and with fibre-reinforced high density polyethylene (HDPE).

Preferably, the high density polyethylene (HDPE) is the modification high-density polyethylene being prepared via a method which: will be by 15 weights Part polyimide fiber, 5 parts by weight aluminium powders and the mixing of 80 parts by weight high-density polyethylene powders are measured, by the mixed of these starting materials It closes object to be placed in the container with knockouts, the initiator that can cause maleic anhydride grafted polyethylene is added, adds 0.15 weight The thickener of part formic acid, 0.8 parts by weight maleic anhydride and 0.5 parts by weight based on xanthan gum is measured, it then will be small by 3 parts by weight granularities In the broken glass fiber of 5mm, calcium oxide-calcium stearate mixture desiccant of 5 weight account polyethylene waxes and 2 parts by weight is also put Enter in reactor, by all the components stirring, ground and mixed and be heated to temperature 5-10 minute of 120-140 DEG C, by mixing for preparation It closes object to be added in double screw extruder, keeps 200-225 DEG C of temperature so that the maleic anhydride of polyethylene is grafted in its feed zone Reaction carry out, in the continuum of double screw extruder, temperature is reduced to 20-25 DEG C first, be then again raised into Expect the temperature that area is kept, finally the enhancing composite polyethylene plastic grain of acquisition is granulated, it is highly dense to obtain the modification Spend polyethylene.

The initiator is preferably azo-compound.The thickener based on xanthan gum is that conventional xanthan gum system increases Thick dose.

In modification high-density polyethylene of the invention, the polyamide being dispersed in polyethylene has thin staple fiber form. That is, polyamide is mainly by section orthogonal to the longitudinal direction, length is 0.05mm or more, maximum gauge is 0.005mm or less Thin staple fiber constitute.This to can avoid being formed rodlike or membranaceous polyamide, while avoiding to dispersibility and mobility Adverse effect, the of the invention system that assembles is with high machinability, the intensity of final products, wearability and antifatigue Property is very superior.

The present inventor the study found that the described reactive adhesive play increase haloflex (continuous phase) and carefully it is short Effect of the fiber polyamide (dispersed phase) in the compatibility of the two interface.Reactive adhesive also works to increase dispersion Property.The intensity of polyethylene significantly improves after maleic anhydride grafting, and can enhance is 1.5-3.0 times of raw material, even higher.

The modification high-density polyethylene has very high wearability and weatherability, with common polythene or other plastics phases Than wearability and weatherability are more prominent, such as the addition of inorganic filler improves its weatherability and wearability.For expanding screw The plastics of silk not will receive steam invasion etc. due to being normally mounted inside fixed device, therefore usually not weatherability is wanted It asks, so the plastics for being generally commercially for setscrew are not suitable for clamp device of the invention.In addition, presently commercially available is used for The plastics of clamp device usually not slide wear-resisting property requirement, therefore are also not suitable for the present invention.The present invention is for this purpose, pass through Cooperative research and development develops above-mentioned modification high-density polyethylene.

About the modification high-density polyethylene obtained with scientific research institutions' cooperative research and development, the applicant will separately be carried out specially Benefit application is protected.

In another aspect of this invention, a kind of method using above-mentioned steel joist chaining part installation keel is additionally provided, it should Method is the following steps are included: the second clamping portion of the second part of chaining part is connected to two longitudinal directions of main joist two sides by (1) In slot；(2) false keel is stuck in chaining part, the first part of chaining part is then bent by living hinge, by false keel packet Folder；(3) installation fastening is carried out by corresponding fixation hole and mounting hole with bolt or screw.

Steel joist chaining part fixation of the invention, it is easy for installation, and preferably, for different piece intensity requirement It is reduced costs while ensuring that fastening is installed using different materials.In addition, can be obtained by the shape for adjusting mounting hole Damping of shocks centainly is obtained, prevents rigid deformation fracture, there is biggish safety redundancy, while curtain wall can also be absorbed Sedimentation, thermal stress and antidetonation effect.

Detailed description of the invention

Fig. 1 is the diagrammatic cross-section of steel joist chaining part according to the present invention；

Wherein 1: steel joist chaining part；2: the second clamping portions；3: second part；3a: the second reinforces protrusion；4: holding section； 5: the first clamping portions；6: first part；6a: the second reinforces protrusion；7: the second sides are to fixed plate；Laterally secure plate at 8: the first；9: Fixation hole；10: bending boundary line；11: pivot；12: mounting hole.

Fig. 2 is the suspended fixing schematic diagram of steel joist chaining part according to the present invention；

Wherein 13: main joist；14: false keel.

Specific embodiment

Below with reference to following embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to This.

Embodiment 1

With reference to Fig. 1 and 2, steel joist chaining part 1 includes first part 6 and second part 3, the two piecemeal activities connect, After mounting, the first part 6 connect with false keel 14, and the second part 3 is connect with main joist 13.Preferably, described First part 6 and second part 3 are realized by pivot 11 to be flexibly connected, and the first part 6 is tabular, and second part 3 leans on One section of nearly pivot 11 is bent to form holding section 4, the width of the holding section 4 with the side equivalent width of false keel 14 so as to Realize that the abutting of false keel 14 surrounds installation, bending part forms bending boundary line 10, and the bending is in 90 degree, the first part 6 side has vertically extending first to laterally secure plate 8, and the side of the second part 3 has vertically extending second side To fixed plate 7, described first, which laterallys secure plate 8 and second side, is located at opposite the two of steel joist chaining part 1 to fixed plate 7 The two sides of side, main joist 13 have two longitudinal slots to be formed that inwardly twist, the two sides that described two longitudinal slots pass through main joist It inwardly twists 90 degree and is formed twice, the end of the first part 6 is formed with the first clamping portion 5, which can support The centre of main joist 13 is stuck in against the outside of two longitudinal slots of main joist 13, the end of the second part 3 is formed There is the second clamping portion 2, the two sides of second clamping portion are respectively provided with the protrusion of a hook solid, which can be connected to master In two longitudinal slots of keel 13.Described first, which laterallys secure plate 8 and the second side, has fixation hole 9, the first side in fixed plate 7 Fixation hole in fixed plate is corresponding with the fixation hole of 13 side of main joist, for being fixed by fixing bolt；First side to Fixation hole in fixed plate is corresponding with the fixation hole of 13 other side of main joist, for being fixed by fixing bolt.

This written description discloses the present invention, including optimal mode using example, and also enables those skilled in the art The manufacture and use present invention.It is of the invention can patentable scope be defined by the claims, and may include this field skill Other examples that art personnel expect.If this other examples have not different from the structural elements of the literal language of claims Element, or if this other examples include the equivalent structure element with the literal language of claims without substantial differences, Then this other examples are intended within the scope of claims.In the case where not will cause inconsistent degree, by reference to It will be incorporated herein in place of all references referred to herein.

Claims (9)

1. a kind of steel joist chaining part, which is characterized in that the steel joist chaining part includes first part and second part, and first Divide and second part is flexibly connected, the first part and second part are made of different materials；

The first part of the keel chaining part is made of high-strength aluminum alloy, and the high-strength aluminum alloy includes: with weight hundred Score meter, 3.0-5.0%Mg, 1.0-2.0%B, 0.5-1.5%Cu, 0.2-0.5%Zn, the Al of surplus, the alloy pass through as follows Founding is made: the metal charge of the intermediate alloy of Mg and B and other metals being put into smelting furnace and is melted, by molten metal The temperature of liquid is controlled at 600-750 DEG C, is kept for 10-15 minutes in the temperature under stiring, is then used argon gas degasification, stands 3-5 On surface, paving spills covering slag after minute, by slag-liquid separation, removes slag, pours into aluminum profile, and the profile being cast into is naturally cold But to room temperature, ageing treatment is then carried out, places be cooled to room temperature later；

The second part of the keel chaining part is made of high-strength iron alloy, and the composition of the high-strength iron alloy is as follows: with The total weight of the ferroalloy, C 1.0-3.0%, Si 0.8-1.0%, Mn 0.6-0.7%, S 0.04-0.05%, V For 0.15-0.25 %, Ti 0.010-0.015%, Ni 16.0-18.0%, Ni/C molar ratio=6-10, surplus be iron and Inevitable impurity.

2. steel joist chaining part according to claim 1, it is characterised in that be flexibly connected as rotation connection.

3. steel joist chaining part according to claim 2, which is characterized in that the first part and second part pass through pivot Axis, which is realized, to be flexibly connected.

4. steel joist chaining part according to claim 2 or 3, which is characterized in that the first part is plate-like, and described Two parts are bent to form holding section close to one end of pivot.

5. steel joist chaining part according to claim 3, which is characterized in that the side of the first part, which has, vertically prolongs First stretched laterallys secure plate, and the side of the second part has vertically extending second side to fixed plate, first side It is located at the opposite side of steel joist chaining part to fixed plate and second side to fixed plate.

6. steel joist chaining part according to claim 4, which is characterized in that described first laterally secure plate and the second side to There is fixation hole, the first fixation hole for lateralling secure on plate is corresponding with the fixation hole of main joist side, for passing through in fixed plate Fixing bolt is fixed；Fixation hole of second side in fixed plate is corresponding with the fixation hole of the main joist other side, for by solid Determine bolt to be fixed.

7. steel joist chaining part according to claim 6, which is characterized in that the fixed plate consolidates mode and main dragon by bolt Bone fixation.

8. steel joist chaining part according to claim 7, the fixing bolt is bolt or anchor bolt.

9. steel joist chaining part according to claim 7 or 8, first laterallys secure plate and the second side has in fixed plate Fixation hole consolidates the two sides that mode is fixed on main joist by bolt respectively.