DE1452714A1 - Process for the fully automatic production of endless lattice girders - Google Patents

Description

PATENTS WÄL ΓΒ

pf-Jh ₃ . \ 3Pan4-Jföinric / i Ody 1452714

PATENTANWALT MULUER-BÖRNER PATENTANWALT OIPL.-iNQ. WEV

■ KRI.IN-DAHt.KM · POOBIEÜBKIALLEE ββ MUNICH 3S · WIOBNMAVlR * TRA.eSB 40

TELEPHONE 7 · 2ΟΟ7. TELEORAMME: PROPINOUS TEUTON ISSSt «· TEI-EaRAMMEtPROPINOU *

15 253 J "Ririlii fl"" ^ift November 1963

ι

I Dr. Expl.

Dipl.-Ing. J. Stefan. Kell e "f Munich - Solln

Process for the fully automatic production of endless lattice girders

Ea are methods for the division of load-bearing grid bodies became known in a triple, single work course, in which a gradually advanced wire is ziokzag-shaped curved and made lengthways by being opened up Stiffening wires or ligaments. Such lattice girders are used, for example, as a reinforcement element for reinforced concrete ceiling girders, which have a sufficient section modulus for such use over a certain cross-section

On the other hand, processes η are used for the fully automatic production of Lattice girders, which are used, for example, as structural elements in building construction, and z..ar for hall buildings, roofs,

_<o load-bearing ceilings, columns and the like, not yet known

<£> become.

^ Lattice girders for such an example specified use

k> dirty;, require significantly higher requirements with regard to - * their buckling strength and the permissible section modulus in

Reference to the commonly referred to as "y-Achee" «Bifgtingsaohae

O1S4OS7 -., - «

BAD m * ^ - . 2 -

than the previously mentioned grid bodies o floodplain for this reason, the parts of such lattice girders with increased requirements not economical in terms of buckling strength and section modulus made of Sundstahl with a relatively low section modulus «Rather, belt parts are made of profiled carrier material related, of which at most the ones arranged between the risers Diagonal struts consist of round material.

The object of the invention is to provide a method for fully automatic Specify the manufacture of lattice girders, the lattice girders in particular having a high buckling strength and a high section modulus.

Such girders have compared to solid girders as they are standardized Whale profiles come from the Blivüemverken, the advantage that eie allow the designer - to a large extent - with the Use carrier building material particularly sparingly and use this building material to use it in a targeted manner, so to speak, by, one, his technical performance through strictly sensible optimal use of the shape of the wearer., .. Both, such a skilful use of materials and, an equally well thought-out, efficient production, this type of carrier is capable of throwing it in all places where it is needed ..: 'as a very inexpensive construction element a special one To give value.

The general idea on which the invention is based is therein, the fully automatic manufacturing process for endless To train lattice girders in such a way that one the automation process significantly favoring resistance fluctuation

compared to the general rule for the production of lattice girders. üb "borrowed Liehtbogenschweissung can be applied and as a starting material not inevitable essential, at least for the belt members profiled material of a relatively short length of _t but a the automation process also wesei lent favoring building material used comes _f which is easy any endlessly extendable"

The problem of an automatic resistance welding process to be overcome by the invention consists in the fact that the parts to be mutually referenced melt locally and in some cases are inaccurate with the effect that the relative position of the parts is calibrated after they have been welded . those rer before i & Verschwessung substantially unterscheidetο These relative Legeäsüerungen to be versohweisi the parts lead without special MaEßnahmen _f as they are disclosed only by the yet to be described the invention in successive welding operations, the strap portions longitudinally to adverse bending and tension of the belts themselves fesw "of the entire truss * in addition, the case of a counterclaim · - was welding process necessarily to be kept constant electrode pressure at each Sehweisstelle the predicted According to not comply with sufficient certainty _e ·. >

cd According to the invention, the fully automatic production of final

co loose lattice girders proceed in such a way that several endless ones

- * Tapes made of a material suitable for lattice girders, especially Q special steel belts, are deformed in successive movement steps £ x, which are interrupted by pauses,

where of the bands "at least one band is formed into a rigid prefix νηά into a continuous string of struts, while the remaining bands are formed into upper" and lower chords? and that in the course of the persecution during the pauses in silence the straps snake through the struts, an electric resistance welding process leads to an endless sequence. beams are welded together *

on the one particular advantageous Yerfahrenew.e-ise done the deformation of the upper and Untergurt® partly gate and partially after, the TenschweiEseiL the top - '' and lower chords with & e Strebenschlänge ,, whereby even at very stiff belts oils Welding "oppressive © Exactly united are nn & eomit a special sweat & «good result is possible *

germ jed ^ ck außja E ^ eckmäBsig "seia _s full Verfor" g the whip Xqt or naoh nasty Terschweiesen Kit ier longwall .schlange rorEunehmeia * In all cases, the straps can each Durek not amgetriebena. Weissenpasre ■ Terformt be "

e -production of the lattice girders naojx Sea according to the invention Yer-

is in an advantageous manner at one of the Gritter-. where carrier _f the characteristics of which are that its continued running _f from a Bananste-rial existing Strebensohlänge to the. end faces of their input ate Ilen (node et rush) between the inner edges of each two similar opposed, upper and lower strap portions forming profiles verschweiset ietp where the serpentine struts at the welds set up the full width of the strip-shaped starting material.

indicates * while the distance between its or visual lines su © ines, kink-eager Qutreohxiitt does not see a U _r j _t C _t Hall> circles or the like is required #

The roll-automatic production of a sitter carrier marked in such Weis® YO2? Stand © n £ is advantageous ineofera neoh & ei £ in accordance with the requirements of TerfakreR lseBonasrE. Lß a large resistance moment in Besug on the ^W y-Aohs® ^lf , without the need for the upper and lower straps since lent wide fluffy auel & dendf from. a verhältnismäBsig grossea ligenvoltimeB- necessary _P would be ersielt solely through the use of a © $ & faähen _s entepr © eh © nd ferei "th band iron for StrebsnsOhlange _f welokee the Grurtteile profiles forming times reohts and left tqä OCE" y-axis "on a correspondingly large S & ssfcfena brings holds © ■ It is aue despite making the Strebenesohlange a flat strip material also ffiöglioh _s to. Strength requirements in the strut part of the lattice girder must be sufficient because the strip material is deformed where it forms struts _and a kinked cross-section _e

The fact that the deformation of the strut length to a fcaiok-stiff profile is designed in such a way that it is me sa dem. Binding satellites. (Nodes) of the strutsBchleygg® i? Strength through the shape. Minimally held-wirfij »firm but possible, the ¥ erferging sur Strsb« naohl & iige ®kXLQ tools can only be obtained by assembling Torahs.

In the following, among others »especially torteilfeßfte © the at least appropriate further developments dee Procedure described »

The shaping of the belts into the belt profile can be done by means of ' take place in the moving device of the bands or belts of successive pairs of rollers in stages, with the welding lugs the nodes either before the ligament begins to be formed or better at a position © between the first and last transformation stage or after this is carried out.

Steel strips, as in this case as the starting material for The belts are used and are supplied by the rolling mills in very considerable lengths in torm, rings or lumps can easily be removed from the reel drain at the point of use are fed.

If such a band is to be welded to a new one, it can be do this without interrupting the feed if between the The reel and the gang entry point into the machine or Attachment eia © type of supply loop is available, the sagging © longitudinal® of which is used to bridge the period of time required for the Welding of the beginning of a waiting following Tollen reel is required.

Furthermore, if one proceeds in such a way that one is gradual Reshaped the 3? laughs ahlbands into the belt profile shape welding . of the nodes either before the beginning of the uniforms of the bands or at a point between the first and last forming stage or according to this, then one has to each suffi'Sohw®ißei & upcoming junction points only flat and accordingly relatively soft ligaments or at least none yet manufacture rigid Profil®, so that the mutual pressure between the * 5wtteil®n and the strand material is kept so low

.. '· ■■ "■■■'." .- ■ '. "'" "■■■ - ■ 7 -, ·.

can be »that he is when setting the welding rollLenandruckes is practical, negligible or in the worst case »but always at least not the intended way of seeing from the start— pressure exceeds »

The pulling of the steel strips through those producing the profiles Pairs of rollers or the removal of the finished lattice girders from the production line of the plant can, for example, through on the part of a drive means with standstill pauses between springs A second movement in the direction of movement around a section corresponding to the junction "stood alternately in the upper or lower belt gripper pliers or the like, which can be moved forward and backward, which work in the clamping grip in the down direction, while they slide freely in the opposite direction wander back, in each case for - the next following deduction * to follow up movement, and if necessary, means for securing the position of the belt parts during this pincer movement are provided · Here are the gripper teeth. "floating" arranged, doho the grippers are arranged in such a way that they are inaccuracies or tolerances with regard to the carrier height adapt the lattice girder and consequently do not have a damaging or even destructive effect on the girders or their welding points

The resistance welding equipment of the upper and "lower chord as a function of the movements of the grippers or another file moving synchronously with them can be controlled automatically in such a way that the welding operations to be carried out by them at the time

909819/0241

are introduced _f au-which the gripper March tight "at ^ EAEEIE motion Ejklue ic that position healed in which they referred to each" BISR sue l.ule.ui "their Stilletanasöauer Yeri? eilsn _r. the actual per-gr-esmgeisässe expiration the welding process © seluEt an autonomous control of the

s is subordinate to _e

The opposite of your, larger irüiilsjiaeE. Hate asr Surte ril fitinn Etegmaterialäer could be exposed to danger _? let as home Seiiweieesn übcsriiitst WIRSS. _f "amB © more than just the Waeser-

the electrodes alone on the garden sit sur Ausswirang espfommends ® & s ^ eh _f by using the well-known means of clay. Sehwsisß & uefcels © is, © fcntepreohead targeted üokalisierimg fier Behwfei £ Bwärse ier'ö £ isufuliren _f whereby in this 2nd event the surts lie bearer of air *

Me swisehexi ilen fe.rtt £ ilen eyelet upper «and lower strap ε chi snenpaaree elKo. as: Obei'- * .md Dntsr-belt ksotesi point by point one: -

S-äe & tre »eaeeh.leiige irirfi is deadly trap wäiarena I @ rtfö »ürei ^ s2i £ 6e ^ latticed rägerherste2.1xmg even to .11 auto τ matisoä. i'srt: ls: a.f € rkS. step by step and between the Gurteissapaare brought in.

Here i'iacLer. Eteueraittel T & r ^ enäung ,. which on ο every time _fl when the rh ^ feiecii s A brace material stretching over two diagonal lengths has a kinked _f additional hanging _? on and

BAD CR! Fi! M

• for H ■ *

descending diagonal section and into the for the Weld-in between the belt parts during one of the following Movement Prepare for rest breaks - Saga brings ».

The splitting process is carried out in the soapy south: that the strut material stream, which is initially still in the stretched position, is ready for folding and encompasses two diagonal lengths, when performing a splitting process on a &? The lower turning point of the descending ate of the last generation and positioning of the struts by means of a permanently fixed device in the sense of an alternating reading and dispensing. the mounting body finds "" is clamped _$ while a sweits such and equally controllable fixed holding device _for the two -Xiiagonallängen comprehensive pursuit Material route Toggle their snäeren end on one with Hilfβ a drive means ^ in besug on di @ © rate fixing device upstream UNOE su .rüök "movable Sehlitts." od. AEGL "holds to such a degree gegea DI® first feethalteeinricfi" tung moved towards, is that the two BiagonaJfclängenteile durchfcaicken in its center upward. and calibrate the resulting kink up to the necessary height - where ice is mean. Aid that promotes the bending or splitting process supports the initiation of this process *

The auxiliary support or »initiation of the folding process

^ Can be achieved by doing so _s that the gate · "

-o and moving back the slide serving drive means an.delE

ο Slide can be rotated on the shorter ana on this one

¹ ^ th angle lever attacks, whose further, longer ane *

"copy

wise with a rabbit protruding at its end? at a Rotary movement of the lever more or less the length of the strut material that is ready to be folded and consists of the two diagonal lengths close® to their center and around the second, movable one holding device turns upwards.

A further step, which is useful in the course of the walk, is that the flat steel strip used to produce the diagonal strut length is perforated on the path z \ x of the folding belt each time during the standstill of its step-by-step access movement to there, each time simultaneously at two points separated by a diagonal length of the struts will.

In this way, the strut band is made more flexible and willing to bend at the points where the folding or kinking is supposed to go afterwards, on the other hand, the holes created in the strut material for the passage of upwardly and downwardly movable pegs or pins are made spines of the two fixing means used, in this manner, depending on the Erfordernis3en _$ either a hold or cause movement of release for the struts material.

TJm always looks good for the struts and for the belts To have pre-treated material available, one leaves that to Processing of certain strut and belt material after

3, a set of consecutive >

> Go through orphans or roles in which they repeated

t. ⁱ ■ · ■■ · ■ ........

* Bieguagen are subjected to opposite sightings and thus experience a EntzuMerung, besides the Ent _k "takes place change of the strut material before it is punched.

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U52714

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It serves the same purpose if the belts after passing through, of the rollers used for their descaling, each with one the pressure that secures their system over at least one log lateral band flanges are weighed away, which may Correct laterally bent or wavy ligaments.

If a lattice girder with statically very favorably profiled diagonal struts is to be produced, the procedure would be as follows: that between the point at which the piercing of the strut material takes place and that where the folding of the material takes place, a profile embossing or pressing device for two successive diagonal parts of the string of struts is provided, which these parts during the standstill of the advancing strut material is able to give the shape of a U, T, 0 or similar profile and consists of two corresponding, There is shaping pressing tools, each from both sides of the strip material with respect to this synchronously can be moved forward and backward in opposite directions.

You two pressing tools are advantageously each through At the same time, toggle lever pairs forming parallelogram guides can be brought closer to or removed from one another, the movements of the toggle lever pairs of the upper and lower pressing tools produced by two corresponding, synchronously operating drive means

_a> will. The 'removal of the punch like die from both sides

ο ·

to the deformed band has the advantage that neither of the two

~ * Tools suffer premature damage through constant scrubbing » to

-. 12 -

After the lattice girder is welded together, every single one Point of view at a junction by a hydraulic Test device automatically on train. or pressure checked. Thereby ι the test device intervenes during the standstill breaks the movement messages of the hinges or the lattice girder in Task. The test device sets an alarm signal or the like in activity if the test equipment detects an incomplete welding point. The Test device, for example, in such a way that at each one node, e.g. B. an upper node, during the standstill break on the upper chords the force P acts and on the two lower chords of the two lower nodes, which this opposite the upper point, only the force P / 2 acts. Rice = If an impermissibly "welded welding point" occurs, one occurs GerJQg-like deformation of an upper chord, e.g. by 1.2 mm, which is necessary for this leads to the fact that the alarm device of the test facility is activated. The test facility expediently exists of hydraulic cylinders and grippers, which, like the gripper tongs mentioned above, are arranged "floating".

The drawings serve to explain the possible exemplary embodiment for a facility to carry out the inventive method. Show it:

1a and 1b a basic diagram of a system for fully automatic Manufacture of endless lattice girders with profiled Upper and lower chords and also profiled diagonal struts,

909819/024 1 - 13 -

Pig. 2 a vertical section through a lattice girder,

Pig. 3 is an elevational view of a length of the device shown in Pig. 2 carrier shown,

Pig. 4 a schematic representation of the welding point at a node with pre-rolled belts,

Pig. 5 the goal rolling of an upper chord part in dtei consecutive Manufacturing phases,

Pig. 5 a final rolling of an upper belt part in three consecutive ones Manufacturing phases, -.

Pig. 6 a view of a junction point,

Pig. 7 a schematic representation of the flat folding device,

Pig. 8 a schematic representation of the profile embossing and pressing device of the tape material.

In all drawings, the same parts have the same reference numerals.

The carrier consists of a split upper belt, which is made up of two profiles 1,1 'and a divided lower chord, which is composed of two profiles 2,2 »(Pig. 1b), with a slender strut from alternately successive ascending and descending diagonal struts 3,3 ', 4,4' etc. (Pig. 2 and 3) ·

The upper and lower chord material, which is initially each from

909819/02 41

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a roll B ^ and R ^ \ , or R ₂ and H ₂ / running flat tape, i. B, steel strip, enters production line 3in at 5.6 and passes through Pig. 1a to its descaling first fold 55 '56, 57 and 55a, 56a, 57a for the two profiles of the Jbergurtes or rollers 55', ^r 56, 57 'and 55'a, 56'a, 57'a suffer for the profiles of the lower chord before it is in Profilwalzenpaareh I ₁ 8, 9 and 7a, 8a, 9a for the profiles of the upper chord or Prorilwaleenpaare 7 ^f , 8 ', 9' and 7 ^! a, 8'a, 9'a for the profiles of the front belt ..ird and later in the profile rollers) aarea 10, 1.1, 12 -and 10a, 11a, 12a correspondingly for the top belts »betw. 1Oi, 11 ", 12" and 1O'a _? 11 «a, 12 ^f a for the bottom chords in the final profile form. (Fig * ih) is brought.

For example, the pre-profiling and the final profiling ¹ OP is done in three phases in Fig. 5 and 5. The goal profiling takes place in principle very similar to the pre-profiling, in that the step-by-step forward movement of the endless carrier is carried out by a feed device 53, which engages only at one point, namely at the finished end of the carrier, with the necessary force to uncoil, descaling, stretching and also salting the upper and lower belts without disrupting the individual rollers or pairs of rollers are provided with drives. "

η of the Gi ttertträgerirvorschub- or generation direction P seen Pig. 1J |) are in front of the finished profiling pairs of valves 10 to between 10 'to 1-2 * two node verification facilities, each with

909819/0241 - 15 - '"

two resistance welding electrodes 13 »13 ¹ and 14, 14 'are arranged, of which the former (13» 13') are used for welding the upper chord junctions, the second (14, 14 *) for welding the lower chord junctions.

A top chord junction point is in Pig. 4 is shown enlarged and in particular also shows the two resistance welding electrodes 14, 14 ', of which the electrode 14 at positive voltage and the electrode 14 ^! is due to negative voltage.

The position of the already mentioned welding humps, which are shown in FIG. 15, 16, 17 can be seen from this FIG. In Fig. 1b with 51 and 51 'are the hump or Roll embossing tools for the upper chords ujjd with 52 and 52 'corresponding Embossing tools for the lower chords indicated, which are arranged in the direction of the arrow in front of the welds and the humps emboss according to FIG. 6 at the points in the belts where the narrow sides of the node points of the strut band with the Belts come into contact.

18 is a flat steel strip (Fig. 8), from which the diagonal brace snake is produced, this tape, which may come from a supply reel or reel R, passes through first. a set of successive rollers or rollers 19 to 24 »where, as can be seen, there is a repeated bend in the opposite direction Is subjected to directions and thus a development

909819/0241

U52714

undergoes scaling and stretching. The last roller 24 and / or the next, in Pig. 8 with 25 designated roller can the Y / alze with the side Eandf !, of the one or those above, has already been spoken of and who have the task of correcting laterally crooked or wavy areas of the band 18, the So tape as far as its side edges are concerned. In Fig. 1a, the lobes are .19 to 25 behind the supply reel R, for the sake of clarity not shown *

When the strut strip has been prepared for further processing in the same way as the belts, it is ". Punched" by means of devices 26 and 27 in a deposit equal to a diagonal length of the strut line and then goes to the profile embossing or pressing device is composed essentially of the two dies 28 and 29 that the strip material along the length of $ e two consecutive diagonal portions (s. Fig. 8) the shape of a U, V. C or similar profile to give capable. the pressing tools 28 and 29 can each be brought closer to or removed from one another by pairs of toggle levers 30 to 33 that simultaneously form parallelogram guides, the movements of the pairs of toggle levers of the upper and lower pressing tools 28 and 29 being brought about by synchronously operating drive means 34 »35.

After doing that this way and on. profiled this point Diagonal strut band has left the embossing or pressing device described, it finally arrives at the

90911 9 / 024.T - 17 -

atelle folding device »which from the stretched tape di» creates a zigzag curved strut serpent. Daa goes in the Way in front of you that the material at the lower turning point 37 of the descending branch 3 of the last produced and in position Brought struts by means of the controllable, stationary device in the sense of an alternating holding and releasing 38 is clamped, while a second-such and in the same Way steer re retaining device 42, the two diagonal lengths 39 and 40 comprehensive strut material route on their the other end to one with the aid of a drive means 41 itt With respect to the first retaining device 38 can be moved back and forth Slide 43 holds in order to such a hatred against the holding device 38 is moved that the two diagonal length parts 39 and 40 in their middle 44 durohkaicken upwards and the resulting kinked edge finally bia to the necessary amount.

The drive means used to move the carriage 43 back and forth 41 engages here on the shorter arm 45 of an angle lever rotatably mounted at 46 on the carriage, whose second, longer arm 47 "conveniently with one at its end protruding rabbit 48, at the beginning of the left in the drawing directed movement of the carriage 43 and the folding process that begins with it more or less close to the desired knee parts 44 reaches down under the strut material and this around the. , The pinch point on the retaining device 42 bends upward.

- 18 909819/0241

Ia Pig »ITo is the Palteinrichtung only through, the pinch points the retaining device 38 and 42 and in Pig «1a is ί the Profilpräge ™ and pressing device only, through, the pressing tools 28 and 29 indicated. The aforementioned holes created in the strut material can be used to corner the egg or through the up and down tenons or mandrels 49 and 50 of the plague holding means 38 and 42 are used in this way either a hold on or a, depending on the requirements Cause movement clearance for the strut material.

The devices shown ia the drawings, 26, 27, 34 »35, 38, 41 and 42 ^ ₀ Figure 7 and 8) are aweckmässigerweise hydraulic Sraftkolbentriebe which are operable by electric remote controlled Tentile in a known manner.

Patent claims

W - 15 253

909819/0241

Claims (1)

PATS NTAN WALTE < uffenJSörmr 1 «2714 PATENTANWALT MUULER-BÖRNER JW PATENTANWALT DIPL.-ING. WEV BERLIN-DAHLEM - PODBIELSKIALLEE 88 Jf% MÖNCHEN 22 WIOENMAYERSTRASSE TELEPHONE 70S9O7 TELEGRAMS: PROPINOUS TELEPHONE: 225985 TELEGRAMS: PROPINDU Berlin, November 18th 15 253 Dipl.-Ing, J. Stefan Keller Munich - Solin | ■ «- <« ·, \ I Dr. Expl. Godparents t ^ a nprüciie ι 1 «Process for the fully automatic division of endless lattice girders, characterized in that several endless belts made of a material suitable for lattice girders), in particular steel strips, deformed in successive movement steps that are interrupted by pauses * where at least one ligament from the ligaments to a knee file— fen profile and deformed into a continuous line of vines is, while the remaining bands are deformed to upper and lower belt parts, and that in the cycle of the deformations During the standstill breaks, the belts with the strut snake by an electrical resistance welding process be welded together to form an endless lattice girder " 2 · The method according to claim 1, characterized in that the Deformation of the upper and lower chords partly in front of and partly ' prove that the upper and lower chords are welded to the strut snake, which means that even with very stiff chords the welding pressures are precisely adjustable and thus a special welding quality is made possible » 909819/0241 TELEPHONE: Ο184ΟΟ7 3 · V @ rfate? © & naeh- Anspraea 1-, characterized in that the "Complete-.Terformsuag. of .belts before welding.-with the Bte © ö®miohl®ng @ takes place « 4 »Method & a © a claim 1 _S , characterized in that the complete © deformation of the belts takes place after welding with the © E Str © Tb © aschlaag ©. ■ 5s Y@rfab.rea aaoh claim 1 to 4? - characterized in that the Gart® nd ^ rea non-powered orphan couple Yerformt werdeao 6 «Method according to claim 1, characterized in that the deformation dta? Strebensehlange is designed so that the. Biegangstellaa (nodes) of the Strebensehlange its buckling strength is kept low by the shape, whereby di © ¥ © rfo2? Mimg to Strebenschlang®, oime bending tool becomes © aaeü Aasp??a@&.1 jbi® 5 _S by GEFC © nnzeichae.t _p that mf orm © a € © r Baader "la di © ßurtprofilf os? m · means in the the ¹ Baader or "© arte - successive itmfeaweie®. © follows, with the welding of the kno- '-. eatwefisr before the beginning of the forming of the bands or. this is done « 8 # Method according to claims 1 to 5 »characterized in that dal Sindarch pulling the bands through the profiles " ^: ■. '■. ■■■ '■ ".. ■' ■ '.- ■' ■... - 3 -. ■ '■'" 9098 19/02 1 * 1 generating pairs of rollers or pulling off the finished lattice girders from the Jertigungsstreoke of the plant duroh on the part of a drive means with standstill breaks awisohtn each second change in direction of movement by one the node distance in the upper or lower chord alternately forward and backward movable gripper tongs or the like is brought about, which work in the pulling direction in the clamping handle entrained, while they work in the opposite direction Wander back in the direction of the free-wheeling movement in order to follow up for the next trigger movement » whereby, if necessary, means are provided for securing the position of the belt parts during this pincer return movement and i the gripper tongs are arranged in particular floating in this way are that they correspond to the respective dimensions of the Q-iter-carrier or adjust inaccuracies in the beam height * 9 · Method according to claims 1 to 5 * 7 and 8, characterized in that the resistance welding devices of the Upper and lower belt depending on the movements of the gripper tongs or another moving synchronously with them Part are automatically controlled in such a way that the welding operations to be carried out by them the point in time at which the gripper teeth begin their return with each movement cycle and the already welded support parts come to a standstill, with the actual program sequence of the welding processes themselves is subordinated to an autonomous control of the welding devices acting in this regard. 909819/0241. ^Ί 10 · Terfahrest naoh äe & .- before, going- ikapxüöhen * thereby, marked ·· · sseiehaatj that did-Vi & erstands @ & lLW @ £ 3smigen: as jaw 1-welded are carried out * w © l »ei the Surteisen, Jaw carriers are » 11 · Yerfahrea. na @ h dea insprü © Ji @ n 1 umd "6, characterized by ₉ daea die awiseheä d © n tortoises, of the upper belt pair of lower belts, alternating at the upper and lower belt knots * · point-wise eizmiaeJiwe is sending Strebeuselilamge during the ■ "'forte ear® it ens the iitter carrier talk itself Töllauto ™ matisek is continuously generated step by step and between the 6 yrte iron pairs is brought »- 12 · Terfahrea aaak Jlssprueh H ₅ iainreit kamseiehnet that ^: find the use of Stwersittel. _f & @ n®m sequence 3 each time> w®nn. the s'feytJhBiscM successive.- Beu@gua.gastillstandspau- » B @ m i © r ToS ⁵ SJIfundable GurS @ is © & .your, take, a folding device- that. here l®-fcst @ n laöes at the same time from. an IlaohstEhlbandhasptl eia © satspreelieM® material line follows * from © iner st? @i Biagonalläiiges. comprehensive strutsmftterialstreoke a kicked part. and descending 2Äagone3.str® ^ enteil generated and in. "which brings ready the Sage for the sense of white between» eis.es.-aea Sirteisem during one of the - following l'eweguii ^ Etillstaaisp.amsea » 13 ⁵ # Yerfatain. naah den iteupE ^ elies 11 mafi 12 _r 'thereby, gekenasseioh> net _ö that the zuaä © Mst m> Qk . i & -d @ r "Strike days> '* "JR3UK falt®» ready ₉ aw © l Biagomalläsigea tiafasseni © MÄterialetreeke bein. lureMSfefsa a © laHrrorganges an - iiaterea ITswemdestell © Mm abßt © ig @ Hies Astes des . strut eye last created and placed in position · by means of an alternating, clinging and Prizes controllable »permanently fixed. Facility whose attachment point is clamped, while a second Such uftt in the same way controllable retaining device, the strut material tree encompassing the two diagonal lengths at its other end on one with the aid of a drive means in relation to the first retaining device and retractable slide or the like holds to such a Measure against the first! Holding device is moved * that the two diagonal length parts in their putty up through «· kink and the resulting kink parts up to the emergency · maneuverable height rises, whereby a kink or palt process promotional aid supports the initiation of this doorway «. 14 · Terfahren according to claim 13, iadur-sk characterized * that da® for gate and zurtick movement of the Sehlittasa (HeBC ¹ SeIo drive «*» means on the carriage via the shorter arm of an angle lever rotatably mounted on this ₉ engages the second, longer one Arm, preferably with a protruding nose at its end, grips the strut material stretch, which is ready for folding and consists of the two diagonal lengths, more or less close to its putty and turns upwards around the second, movable plague holding device " 15 · Terfahren according to claim 11, characterized in that the ₉ flat- 909819/0241 \H Steel belt on the way to the folding device the pauses in its gradual access movement after there each time punched simultaneously at two points separated by a diagonal length of the struts will· 16. The method according to claims 11, 13 and 15, characterized in » that the holes created in the strut material for plugging in or out of the strut can be moved up and down Tenons or thorns of the two retaining devices are used be done in this way depending on the requirements either a plague holding or a movement clearance for that. Cause strut material » 17 · Method according to claims 11 and 16, characterized ι that the tapes after they run out of their supply reels one set of consecutive. Rollers or rollers go through in which they make repeated bends in opposite directions Be subjected to calibrations and thereby a discharge Experienced. 18 »Method according to claims 11 and 17, characterized in that that the strips after the passage en to their descaling Serving rollers each with a pressure securing their system over at least one roller each with lateral edge flanges be pulled away, which may bend laterally or. correct wavy ribbons 9 098 1 9/02 19 »The method according to claim 11, characterized in that the» In the event "that a lattice girder with structurally very favorable profiled diagonal struts is to be produced" between the point * where the strut material is perforated and the one where the material is folded, a profile embossing or presetting for two consecutive times Diagonal parts of the aftrebensohlange is provided, which is able to give these ropes the for »TT, V, O or similar profile during the standstill pause of the advancing strut material and consists of two corresponding, shaping Presawerkaeugen, each γοη. both sides of the strip material are, with regards to this in synchronism in opposite directions and forth aurüoicbewegbar * 20 »The method according to claim 19, characterized in that the both pressing tools are each brought closer to one another by pairs of toggle levers that simultaneously form parallelogram guides or »can be removed from each other, whereby the Sewsgunge * of the knee lever pairs of the upper and lower Preaswerkaeugta produced by two corresponding, synchronously operating drive means »* ' 21 »The method according to claim 1 and preceding, characterized in that, after the welding, each eiaa ^ lnt Sohwtia · - set the test device automatically to pull at a junction. or pressure is checked that comes into operation during standstill pauses ». 909819/0241, \. - * - \ 22 “Poop that. Process gesaäse claim 1 and one or more. The lattice girder produced in the preceding claims is characterized in that the lattice girder consists of a strip material that is terformed into a continuous strut as long as the length of the struts, which at the end faces of their bend atelles (junction points) between the inner flanks upper and "Jiiere strap portions forming profiles welded iftt * wherein the strut serpentine to the Sehweisstellen having the Toll · width of the strip-shaped starting material _t during di · Strebensohlange awisehen their Biegungsateilen bsw · Sehweis et rush to a curtsies eleven s cross-section by Jkrt" ine® B ₉ ■■ ¥ »O, semicircle or the like is shaped · w / m / m X -J " ;