WO2012119702A2

WO2012119702A2 - Pallet container

Info

Publication number: WO2012119702A2
Application number: PCT/EP2012/000728
Authority: WO
Inventors: Dietmar Przytulla
Original assignee: Dietmar Przytulla
Priority date: 2011-03-05
Filing date: 2012-02-18
Publication date: 2012-09-13
Also published as: DE102011013192A1; WO2012119702A3; WO2012119702A4

Abstract

The invention relates to a pallet container (10) having a thin-walled inner container (12) made of a thermoplastic plastic for storing and transporting liquid or flowable filling materials (18), comprising a lattice pipe supporting jacket (14) as supporting jacket, which tightly encloses the inner container (12), and having a bottom pallet (16) on which the inner container (12) rests, and to which the lattice pipe supporting jacket (14) is firmly connected, wherein the lattice pipe supporting jacket (14) comprises vertical and horizontal pipe tubes (20,22), characterized in that the vertical and horizontal pipe rods (20,22) are welded to each other at the intersections thereof via welding inserts (34, 44, 48, 50, 52, 58 ). Several known pallet containers have serious deficiencies (fatigue ruptures of the lattice pipe support jacket) in case of longer lasting transport-related alternating bending stresses which occur, for example, during continuous transport-related stresses on roads that are in poor condition. According to the invention, in order to improve the stability of the lattice pipe support jacket (14), the welding of the horizontal and vertical pipe rods (20,22) to each other is carried out at the intersections thereof via welding inserts (34,44,48,50,52,58). The welding inserts (34, 44, 48, 50, 52, 58) enable the use of pipe rods with a continuous profile and act additionally as damping elements in case of continuous transport-related stresses.

Description

pallet container

description

The invention relates to a pallet container with a thin-walled rigid inner container made of thermoplastic material for the storage and transport of liquid or flowable

Contents, with a plastic container as a support jacket tightly enclosing lattice frame and with a bottom pallet on which rests the inner container and with which the Gitterrohr- support jacket is firmly connected, wherein the lattice support shell consists of vertical and horizontal at their intersections welded together pipe rods.

State of the art

Pallet containers are used for the transport and storage of liquid or flowable, partially dangerous products. During transport of filled pallet containers - especially for high specific gravity products and stacked pallet containers - on poor roads with hard-sprung trucks, rail or sea transport, the trellis frames are heavily loaded.

These transport loads generate due to stacking load in stacked pallet containers axial pressure loads on the lattice tube frame and by surge, emanating from the liquid filling, in addition radial Biegeschwellbelastungen on the lattice tube frame. The welds or the welding areas of the intersection of the vertical and horizontal bars of the grid ear support jacket are the places with the highest loads. Such stresses can lead to breakage of the welded joints or the grid pipes, so that the required stacking and transport safety of the pallet container is no longer present.

All known pallet container with tubular frame have at the intersections of the pipe rods welded joints, the pipe bars are welded together with 2 or 4 welds directly and in some lattice frame are limited to relieve the welding areas limited elastic bending points in the pipe bars formed next to the welding areas.

Such pallet containers with welded tubular frame are well known, for example, EP 0 734 967 A2. The lattice tube frame of the pallet container known therefrom consists of a round tube profile, which is deeply trough-shaped recessed at the welded intersections and thus forms 4 welds with crossed tubes. The limited elastic bending points are created by additional depressions of the weld ends.

From EP 0 755 863 A1, another pallet container is known, the bars of which have a square tube profile which is only partially slightly (1 mm) pressed in the intersection area for better welding and thereby forms 4 contact points for the welding. The pipe profile otherwise has a uniform cross section between the intersections without any indentations.

From DE 196 42 242 A1 another pallet container is known with a grid frame of open trapezoidal profile bars and the rod length constant profile. This results in the 4 spot welds at the rod intersection points through the flattened outwardly flat surfaces of the profile bars.

Another pallet container with a consistent, continuous tube profile is known from US 6,244,453 B1. Here are the 4 welds at the rod intersection points through the continuous two- or four-sided square profile recesses.

From EP 1 289 852 B1 a further pallet container is known, the bars of which have a trapezoidal pipe profile which has welding points in the intersection area 4. In the area next to the crossing points of the pipe bars on the tube side opposite the welding area indentations are executed, which act as predetermined bending points.

Another pallet container with 4 welds in the crossing region of the pipe rods is known from EP 1 618 047 B1. The elasticity behavior of the lattice tube frame is achieved here by reducing the pipe cross-section height between or outside the welded intersection points.

Disadvantages of the prior art

The hitherto known lattice frame with a uniform continuous lattice tube profile and 2 or 4 welds at the intersection points have the common disadvantage that the horizontal and vertical lattice tube bars are overall bending and torsional stiff in Transportbiegewechselbeanspruchungen. As a result, fatigue cracks and bar breakage occur here in particular after a comparatively short time of use in the vicinity of the welded intersections of the bars, or the welds of the intersections break off.

When bending lattice tube rods, the edge fibers receive the strongest stress, bending stresses are tensile and compressive stresses. All known crossing points of tubular frame with directly welded tube rods have 2 or 4 common welds. When bending the pipe bars, the common weld points are loaded. The resulting voltage peaks can lead to damage in the area of the welded tube rods at long alternating bending stresses that occur during transport of the pallet container.

Those grid tube frames with welded round tubes with 4 welds, e.g. known from EP 0 734 967 A2, and with significantly reduced pipe cross-section height provided in the region of the intersections (no continuous pipe profile, everywhere equally deep dents or reduced pipe cross-section height at the rod intersection points), have the disadvantage that considerable load peaks occur in these areas of reduced pipe cross-section and thereby breakage or kinks z. B. case tests, the hydraulic internal pressure test and bending alternating stresses are formed by transport loads.

Those known trellis frame with 4 welds in the crossing region of the pipe bars, known from EP 1 289 852 B1 and EP 1 618 047 B1, and predetermined bending or predetermined bending areas have the disadvantage that the rod areas are not uniformly loaded and only the areas with reduced pipe cross-section Bending alternating voltages must absorb the transport loads.

In principle, all tubular bars of the tubular space frame must be oversized with predetermined bending points, the reduced tube cross-section height of the predetermined bending points absorbs the bending alternating stresses, but reduces the static load capacity of the tubular space frame.

task

It is the object of the present invention to provide a generic pallet container with a tubular space frame of welded pipe rods, which no longer has the disadvantages of the prior art - taking into account the stacking load of a filled stacked pallet container (double stacking) in addition to the usual transport surge loads of liquid filling material.

Solution of the task

This object is achieved according to the invention by a pallet container with the features of claim 1. The dependent claims contain advantageous and expedient developments of the invention.

The pallet container according to the invention for liquids with a tubular support shell is distinguished by the following advantageous embodiments:

The vertical and horizontal pipe bars have over their length a continuous closed same profile and thus the same Bending resistance torque on. At their intersections, the pipe bars are not welded directly, but indirectly via welding inserts. The loads occurring on a pipe rod are not passed on directly to the pipe rod to be welded, but transferred via the welding insert. The welding inserts act as damping elements and reduce the mutual stress of the welded over the welding inserts pipe rods at their intersections. The welding points vertical and horizontal pipe bar are separated. Particularly advantageous are the embodiments in which all welding points are only in the compressive stress range of the pipe rods.

In a further particular embodiment of the invention, standard rectangular profiles are used without Schweißrundungen for the vertical and horizontal pipe bars, the Schweißbuckel are executed only in the welding inserts.

By the execution of the pipe rods without dents for welding or without indentations that act as predetermined bending points, the pipe bars can be reduced in their profile or cross-section and thus the weight of the tubular support shell is reduced.

In a further embodiment of the invention, the welding inserts can be used only at some pipe rod crossing points - the stress critical - the lattice ear support mantle.

Drawings and sketches

The invention will be explained and described in more detail with reference to embodiments shown in the drawings. Figures 3 - 14 show the prior art, Figures 1, 2, 15 - 27, the pallet container according to the invention and the pipe rod crossing points according to the invention. Show it:

1 shows a pallet container according to the invention in front view, Figure 2 shows a pallet container according to the invention in side view,

FIG. 3a shows the hydrostatic pressure distribution in the inner container

FIG. 3b shows the schematic deformation of the tubular support shell by means of surge forces with superimposed stack load (side view),

Figure 4 shows the schematic deformation of the tubular support shell by surge forces with superimposed stack load

(Top view),

FIG. 5 shows a test pallet container with a tubular support shell and vertical pipe rods inside,

FIG. 6 shows a test pallet container with a grid tube supporting jacket and vertical tube rods outside,

FIG. 7 shows the lateral deformations of a vertical pipe rod in FIG

FIG. 7a without deflection, FIG. 7b with deflection outwards, and FIG. 7c with bending inwards, FIG.

FIG. 8 shows a stress distribution on a vertical pipe rod in FIG

Detail "X" at a welded pipe-rod crossing point of FIG. 7b,

9 shows a stress distribution on a horizontal pipe rod in detail "X" at a welded pipe-rod crossing point, section C-D of FIG. 8, FIG.

FIG. 10 shows a force analysis on all four common welding points of a pipe-crossing point, view E of FIG. 8,

11 shows the tearing off of a welding point of a pipe-rod crossing point of FIG. 8, FIG.

FIG. 12 a crack formation in the tube rod next to a spot weld of FIG. 8,

FIG. 13 shows a stress distribution on a vertical pipe rod in FIG

Detail "Z" at a welded pipe-rod crossing point of FIG. 6,

14 shows a stress distribution on a horizontal pipe rod at a welded pipe-rod intersection point F-G of FIG. 13, FIG.

FIG. 15 shows a welded pipe rod intersection according to the invention with welding insert, position according to view "H" in FIG

1 ,

FIG. 16 shows a section I-J through the vertical pipe rod of FIG. 15 at a welded pipe-rod crossing point,

17 shows a section K-L through the horizontal pipe bar of the figure

15 at a welded pipe-rod intersection,

FIG. 18 shows a further welded tube rod crossing point according to the invention with welding insert,

FIG. 19 shows a section M-N through the vertical and the horizontal tube bar of FIG. 18 at a welded tube-rod crossing point,

FIG. 20 shows another welded tube rod intersection point according to the invention with welding insert,

Figure 21 is a section O-P through the vertical and horizontal

Tube rod of Figure 20 to a welded Cage-crossing point,

FIG. 22 shows a further welded tube rod intersection point according to the invention with welding insert,

Figure 23 is a section Q-R through the vertical and the

horizontal pipe rod of Figure 22 at a

welded tube rod crossing point,

FIG. 24 shows a further welded tube rod intersection point according to the invention with welding insert,

Figure 25 is a section S-T through the vertical and horizontal

Pipe rod of Figure 24 to a welded

Cage-crossing point,

FIG. 26 shows a further welded pipe rod intersection according to the invention with welding insert,

Figure 27 is a section U-V through the horizontal and the vertical

Tube rod of Figure 26 to a welded

Cage-intersection.

description

In Figure 1, an inventive pallet container 10 with thin-walled rigid inner container 12 made of thermoplastic material, grid pipe support jacket 14 and bottom pallet 16 in front view is shown (pallet width 1000 mm). The pallet container 10 is shown in Figure 2 in side view (pallet length 1200mm). When filling an inner container 12 with liquid product 18 results in a shown in Figure 3a course of the hydrostatic internal pressure Pi, which increases linearly from top to bottom, with the center of gravity "S" of the liquid Filled Pi located in about one third of the height of the inner container 12.

When transporting a pallet container, e.g. on a truck, a same second pallet container is stacked. In this case, the lower pallet container is charged in addition to the changing surge pressure loads of the liquid filling material in a superimposed manner by the stack load of the up-and-down stacked pallet container (double stacking).

This causes in dynamic transport loads in Figure 3b clarified bulge of the inner container 12 and the lattice support shell 14 with maximum lateral bulge exactly at the altitude of the center of gravity S. With dynamic oscillations "pumps" the inner container 12, wherein the filling level of the liquid filling material 18th changed, while the side walls of the tubular support shell 14 deforms elastically outwards and inwards by the amounts "O" and "I." The deformation states change from 0 to I in dynamic transport loads in a rapid change of about 3 Hz = approx .180 rashes / minute.

In Figure 3b, this state of vibration is shown for the long side wall of the pallet container 10, wherein the tube bars of the lattice support shell 14 forcibly (by the stacked pallet container 10 reinforced) must undergo elastic deformation to the outside and inside. FIG. 4 shows the vibration state of the long side wall of a pallet container 10 in FIG the top view. The deformation of the side wall to the outside is considerably greater than the compression to the inside.

In the case of the test pallet container 10 shown in FIG. 5 (with continuous tube rod profile without elasticity-enhancing impressions and with vertical vertical tube rods) which was deliberately exposed to a continuous vibration overload for experimental purposes, the circles in the vertical and horizontal lines are shown in the illustration for illustration purposes horizontal pipe bars which fail and break first according to the dynamic vibration loads.

When considering loading conditions, the most heavily loaded area or the weakest point must be taken into account. The vertical pipe bars 20 in the middle of the long side walls of the tubular support shell 14 are subject to the highest loads in the area of the largest bulge at the height of the center of mass "S" (area "X"). The first points of failure were there in the welded intersection points in the tensile stress region of the vertical pipe bars 20 at the lower welding points. The following failure points were in the welded intersections in the area "Y", in the tensile stress region of the horizontal pipe bars 22.

In the case of the test pallet container 10 shown in FIG. 6 (with continuous tube rod profile without elasticity-enhancing indentations and with externally arranged vertical tube rods 20) which was deliberately exposed to a continuous vibration overload for experimental purposes, those locations of the tubular support shell 14 are shown with circles drawn in for illustration marked at the the dynamic vibration loads failed and broke. The failure points in these tests were in the welded crossings in the area "Z", in the tensile stress region of the horizontal pipe bars 22.

In FIGS. 7a, 7b and 7c, a vertical tube bar 20 with its elastic line 21 in the region of a lower crossing point "X" with a welded-on horizontal tube bar 22 of a pallet container 10 is considered. The vertical tube rods 20 are arranged inside the lattice tube support jacket 1.

Figure 7a shows the initial position of the vertical tube rod 20, while Figure 7b shows the state of its greatest outward deflection "0" and in Figure 7c the state of its greatest inward deflection "I".

In the deflection of a vertical pipe rod 20 to the outside (Figure 7b), the outside of the tube rod 20 high tensile stresses and the inside of the tube rod 20 corresponding compressive stresses is exposed. In the deflection of a vertical pipe rod 20 inwardly (Figure 7 c), however, the outside of the tube rod 20 lower compressive stresses and the inside of the tube rod 20 corresponding lower tensile stresses is exposed. These deformation states occur at dynamic transport loads in rapid change.

8 shows the stress states of the vertical tube rod 20 in the region "X" in position 7b, the outside of the vertical tube rod 20 is subjected to tensile stresses and the inside to compressive stresses, the common weld points "SP" being subjected to tensile stresses. Figure 9 (section CD of Figure 8) shows the course of the elastic bending line 23 and the stresses in the bent horizontal pipe bar 22 at the crossing point "X." The outside of the horizontal pipe bar 22 is subjected to tensile stresses, the inside to compressive stresses "SP" are exposed to compressive stresses.

In FIG. 10 (view E of FIG. 8), the tensile forces "-" and compressive forces "+" resulting from the deformations of the horizontal (22) and the vertical tubular bar (20) on the respective common weld spot "SP" are shown and the resulting " R "drawn.

When looking at Figure 3b it is clear that the vertical tube rod 20 is bent more below the intersection "X" than above this intersection. The reason for this is that the lower end of the vertical pipe bars 20 is firmly fixed to the bottom pallet (16) via the lower horizontal pipe bar 22 and the distance of the intersection "X" to the bottom pallet 16 is comparatively short bent horizontal pipe rods 22 and additionally twisted, whereby a torsional stress arises, which manifests itself in the lower welding points of the considered crossing point "X" as additional additive tensile stress "T" (Figures 11, 12).

The comparison stress acting on the lower weld points of the crossing point "X" is composed of the resultant "R" and the torsional stress "T." The comparison stress can lead to a fatigue fracture or bar fracture (FIG. 12) or to a tearing / detachment (FIG 1) the common spot welds "SP" to lead. The weak point of the crossing points "X" lies in the tensile stress region of the vertical pipe bars 20 near the common weld points "SP". The following weak points in the continuous vibration overload of the test pallet container 10 of Figure 5 were in the "Y" in the tensile stress range, but the horizontal bars 22nd

In the case of the test pallet container 10 shown in FIG. 6 (with continuous tube bar profile - without elasticity-enhancing indentation and with externally arranged vertical tube rods 20) which were deliberately exposed to a continuous vibration overload for experimental purposes, the points in the horizontal tube rods 22 are illustrated with circles drawn in for explanation marked, which failed and broke according to the dynamic vibration loads. In this grid-tube support jacket 14, there was no damage to the vertical pipe bars 20, tearing or detachment of the common welds "SP" or bar breaks occurred only on the horizontal pipe bars 22 in the "Z".

The voltage states in the tube rods are shown in FIGS. 13 and 14. From both views it can be seen that the highest stresses arise in the peripheral fibers of the pipe bars. Again, the damage occurred as in Figure 1 1 and 12 only in the welded tension region of the horizontal pipe bars 22.

In Figures 15, 16 and 17, a welded pipe-rod crossing point according to the invention, position according to "H" in Figure 1, is shown with a flat welding insert 34. Figure 15 shows the intersection from the outside, Figure 16 the section 1J and Figure 17 the Section KL of FIG. 15. The vertical tube rod 20 and the horizontal tube rod 22 consist of the rectangular profile I 30, which is designed with two weld roundings 32. The welding of the two rectangular profiles 30 takes place via the welding insert 34, which is also designed with welding roundings 36. The weld fillets 32 and 36 act as welding bumps in resistance welding.

The welding of the vertical tube rod 20 with the rectangular profile 30 and the welding insert 34 via the weld roundings 32 and 36, it is the welds vertical pipe rod 38 is formed. The welding of the horizontal pipe bar 22 with the rectangular profile 30 and the welding insert 34 via the weld fillets 32 and 36, it is the welds horizontal pipe rod 40 is formed.

When placing the welded intersection point of Figure 15 in the load critical area of the tubular support shell 14 - lower intersection "X" in Figure 5 - deform the pipe bars and their elastic bending line formed in transport loads according to the figures 7. In the lateral deformation of the vertical pipe bar 20 with flexing outward, Figure 7b, the tube bars are bent according to the elastic bending lines 21 in Figure 17 and 23 in Figure 16 and generate stresses in the tube bar edge fibers.

In FIG. 17 it is shown that, due to the deformation of the vertical tube rod 20 corresponding to the elastic bending line vertical tube rod 21, tensile stresses arise at the welding points vertical tube rod 38, which, however, does not produce the welding points horizontally. taler pipe rod 40 load. In Figure 16 it is shown that due to the deformation of the horizontal pipe bar 22 corresponding to the elastic bending line horizontal pipe rod 23 at the welds horizontal pipe rod 40 compressive stresses arise, but do not load the welds vertical pipe rod 38. By using the welding insert 34 with separate welding points for the vertical pipe bar 38 and horizontal pipe bar 40, the stresses resulting from bending of the pipe bars 20 or 22 are only from the welding points formed with the respective pipe bar 20 or 22 and the welding insert, either 38 or 40, added.

1 shows a further embodiment of a welded pipe rod crossing according to the invention, with a flat welding insert II 44. Figure 18 shows the point of intersection from the outside, Figure 19 the section MN of Figure 18. The vertical tube bar 20 and the horizontal tube bar 22 consist of a standard rectangular profile II 42 without welding rounds, and the welding of both standard rectangular profiles 42 takes place via the welding insert 44, which is designed with welding bosses 46. The welding of the vertical tube bar 20 from the standard Rectangular profile 42 and the welding insert 44, via the welding boss 46, the welding points are formed vertical pipe rod 38. The welding of the horizontal pipe bar 22 from the standard rectangular profile 42 and the welding insert 44 via the weld hump 46, it will be the welds horizontal pipe bar 40 formed. 1, with a tubular welding insert III 48. Figure 20 shows the intersection point in section through the vertical tube rod 20 and the horizontal tube rod 22 21 shows the section OP of FIG. 20. The vertical tube bar 20 and the horizontal tube bar 22 consist of the standard rectangular profile 42 without welding rounds. The welding of the vertical pipe bar 20 from the standard rectangular profile 42 and the welding insert 48 via the weld hump 46, the welding points vertical pipe rod 38 are formed. The welding of the horizontal pipe bar 22 from the standard rectangular profile 42 and the welding insert 48 via the Sweat hump 46, it will be the Schw Eißpunkte horizontal pipe bar 40 is formed.

When placing the welded pipe rod crossing point of Figure 20 in the load-critical area of the tubular support shell 14 - lower intersection "X" in Figure 5 - deform the pipe bars and the elastic bend line formed during transport loads according to the figures 7. In the lateral deformation of the vertical pipe bar 20 and the horizontal pipe bar 22 with outward deflection, Figure 7b, the pipe bars are bent according to the elastic bending lines 21 in Figure 20 and 23 in Figure 21 and generate stresses in the pipe rod edge fibers. In Figure 20 it is shown that due to the deformation of the vertical pipe rod 20 corresponding to the elastic bending line vertical pipe rod 21 at the welding points vertical pipe rod 38 compressive stresses arise, but not the welds horizontal pipe rod 40 load. In Figure 21 is shown that by the deformation of the horizontal pipe bar 22 corresponding to the elastic bending line horizontal pipe rod 23 at the welds horizontal pipe rod 40 compressive stresses arise, but not the welds vertical pipe rod 38 load. An advantage of this design is that all welds 38 and 40 of the vertical pipe bars 20 and the horizontal pipe bars 22 are in the compressive stress range of the pipe rods.

1 and 2 show a further cross-section of the welded pipe rod according to "H" in FIGURE 1 with a tubular welding insert IV 50. FIGURE 22 shows the intersection of the vertical pipe rod 20 and the horizontal pipe rod 22 23 shows the section QR of FIG. 22. The vertical tube bar 20 and the horizontal tube bar 22 consist of the standard rectangular profile 42 without welding rounds The welding of the vertical pipe bar 20 from the standard rectangular profile 42 and the welding insert 50 takes place via the welding boss 46, the welding points are formed vertical pipe rod 38. The welding of the horizontal pipe bar 22 from the standard rectangular profile 42 and the welding insert 50 via the weld hump 46, it the welds become more horizontal Pipe rod 40 formed. An advantage of this design is that all welding points (38 and 40) of the vertical pipe bars 20 and the horizontal pipe bars 22 are in the compressive stress area of the pipe bars and that the welding insert 50 is easy to mount over the vertical pipe bar 20.

In Figures 24 and 25, another welded pipe-rod crossing point according to the invention, position "H" in Figure 1, is shown with a U-shaped welding insert V 52. Figure 24 shows the intersection point in section through the vertical pipe rod 20 and the horizontal pipe rod 22, Figure 25 shows the section ST of Figure 24. The vertical tube rod 20 and the horizontal tube bar 22 consist of the standard rectangular profile 42 without welding rounds The welding of the vertical pipe bar 20 from the standard rectangular profile 42 and the welding insert 52 is effected via the welding boss 46, the welding points are formed vertical pipe rod 38. The welding of the horizontal pipe bar 22 from the standard rectangular profile 42 and the welding insert 52nd takes place via the weld hump 46, it will be the welding spikes kte horizontal tube bar 40 is formed. It is advantageous in this embodiment that all weld points 38 and 40 of the vertical pipe bars 20 and the horizontal pipe bars 22 lie in the compressive stress area of the pipe bars and that the welding insert 52 is easy to weld to the vertical pipe bar 20. 1, with a flat welding insert VI 58. Figure 26 shows the intersection point from the outside, Figure 27 shows the section UV of Figure 26 in FIGS 26 and 27 another welded pipe rod crossing point, position according to "H". The vertical tube rod 20 consists of the standard rectangular profile 42 without weld fillets and has an indentation 54 at the rod crossing point The horizontal tube rod 22 consists of the flat standard rectangular profile III 56 without weld fillets and 56 takes place via the welding insert VI 58, which is executed with welding bulges 46. The welding of the vertical tube rod 20 from the standard rectangular profile 42 and the welding insert 58 takes place via the welding bulges 46, the welding points vertical tube rod 38 are formed horizontal pipe bar 22 from the standard rectangular profile 56 and the Schwe Insert 58 is made via the welding boss 46, the welding points horizontal pipe bar 40 are formed. An advantage of this design is that all welds 38 and 40 of the vertical pipe bars 20 and the horizontal pipe bars 22 are in the compressive stress range of the pipe rods and that the radial width of the pipe rod crossing point is low.

Reference list 10 pallet containers 12 inner containers 14 grid pipe support jacket

16 floor palette

18 liquid product

20 vertical pipe bar

21 elastic bending line vertical pipe rod

22 horizontal pipe bar

23 elastic bending line horizontal pipe rod Pi hydrostatic internal pressure

S Focus on liquid contents

0 deflection to the outside

1 bend inwards

"X" lower crossing point

"Y" lateral crossing point

"Z" central crossing point

"-" tension

"+" Compressive stress

"R" resulting load

"T" torsion load

"SP" common weld point

30 rectangular profile I Welding round Rectangular profile I Welding insert I

Welding rounds Welding insert Welding points Vertical tube rod Welding points Horizontal tube rod Standard rectangular profile II

Welding insert Ii

weld projection

tubular welding insert III tubular welding insert IV

U-shaped welding insert V

Indentation Standard rectangular profile II Standard rectangular profile III

Welding insert VI

Claims

claims

1.) pallet container (10) with a thin-walled inner container (12) made of thermoplastic material for the storage and transport of liquid or free-flowing products (18), with a inner container (12) as a support jacket tightly enclosing lattice tube support jacket (14) and a bottom pallet (16) on which the inner container (12) rests and with which the grid tube support jacket (14) is fixedly connected, the grid tube support jacket (14) comprising vertical and horizontal tubular rods (20, 22) in that the vertical and horizontal tube bars (20, 22) are welded together at their intersection points by welding inserts (34, 44, 48, 50, 52, 58).

2) pallet container (10) according to claim 1, characterized in that the welding inserts are made flat (34, 44, 58).

3) pallet container (10) according to claim 1, characterized in that the welding inserts are tubular (48, 50) are executed.

4) pallet container (10) according to claim 1, characterized in that the welding inserts U-shaped (52) are executed.

5) pallet container (10) according to any one of the preceding claims, characterized in that the vertical (20) and the horizontal pipe bars (22) standard rectangular profiles (42,56) and the welding over the weld boss (46) of the welding inserts (44, 48, 50, 52). 6) pallet container (10) according to any one of the preceding claims, characterized in that the vertical and horizontal tube rods (20,22) are welded together only at some intersections with welding inserts (34, 44, 48, 50, 52, 58).

7) pallet container (10) according to any one of the preceding claims, characterized in that welding points (38,40) of the vertical pipe bars (20) and the horizontal pipe bars (22) with the welding inserts (34, 44, 48, 50, 52, 58) lie in the compressive stress region of the tubular rods (20, 22).