EP3622133B1 - Gekröpfter auslegerarm aus faserverbundmaterial mit veränderlichem querschnitt für mobile betonpumpen und betonpumpe - Google Patents

Gekröpfter auslegerarm aus faserverbundmaterial mit veränderlichem querschnitt für mobile betonpumpen und betonpumpe Download PDF

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Publication number
EP3622133B1
EP3622133B1 EP18725450.3A EP18725450A EP3622133B1 EP 3622133 B1 EP3622133 B1 EP 3622133B1 EP 18725450 A EP18725450 A EP 18725450A EP 3622133 B1 EP3622133 B1 EP 3622133B1
Authority
EP
European Patent Office
Prior art keywords
boom arm
cross
section
offset
edges
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18725450.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3622133A1 (de
Inventor
Jens HÄFNER
Peter MÖGLE
Ansgar MÜLLER
Knut Kasten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Putzmeister Engineering GmbH
Original Assignee
Putzmeister Engineering GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Putzmeister Engineering GmbH filed Critical Putzmeister Engineering GmbH
Publication of EP3622133A1 publication Critical patent/EP3622133A1/de
Application granted granted Critical
Publication of EP3622133B1 publication Critical patent/EP3622133B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
    • E04G21/04—Devices for both conveying and distributing
    • E04G21/0418—Devices for both conveying and distributing with distribution hose
    • E04G21/0436—Devices for both conveying and distributing with distribution hose on a mobile support, e.g. truck
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/68—Jibs foldable or otherwise adjustable in configuration
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
    • E04G21/04—Devices for both conveying and distributing
    • E04G21/0418—Devices for both conveying and distributing with distribution hose
    • E04G21/0445—Devices for both conveying and distributing with distribution hose with booms
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
    • E04G21/04—Devices for both conveying and distributing
    • E04G21/0418—Devices for both conveying and distributing with distribution hose
    • E04G21/0427—Devices for both conveying and distributing with distribution hose on a static support, e.g. crane

Definitions

  • the invention relates to a boom arm for mobile concrete pumps and a mobile concrete pump.
  • Mobile concrete pumps regularly have a boom arranged on a mobile substructure with a conveying line guided along it, through which free-flowing concrete can be pumped.
  • the cantilever comprises a plurality of cantilever arms, which can be pivoted relative to one another about pivot axes in each case transversely to the longitudinal direction of the cantilever arm.
  • the specified maximum height can, for example, correspond to the usual clearance heights in road traffic, so that the mobile concrete pump can also move under bridges and through tunnels.
  • Cranked cantilever arms made of steel are known.
  • several steel profiles with the same cross section are welded together in such a way that the desired cranking occurs, with the As a rule, two steel profiles are arranged essentially parallel with a crank and are connected to one another by a third steel profile running at an angle thereto.
  • the steel profile must have a certain wall thickness in order to absorb the forces acting on the cantilever arm during operation and to enable the offset to be produced by welding.
  • a cranked extension arm according to the prior art has a not inconsiderable weight.
  • the invention is based on the object of creating a cranked cantilever arm and a mobile concrete pump in which the disadvantages of the prior art no longer occur or only occur to a reduced extent.
  • the invention relates to a cantilever arm according to claim 1, wherein the cantilever arm, in particular for the placing boom of a concrete pump, has a first and a second end, with at least one cranked section being provided between the first and the second end of the cantilever arm, in which, with proper use occurring main bending loads act as torsional loads, and the
  • the cantilever arm is made of fiber composite material, with the height of the cantilever arm in cross section away from the bent area being greater than the width of the cantilever arm in cross section and in the bent area the width of the cantilever arm in cross section being greater than or equal to the height of the cantilever arm in cross section.
  • the invention further relates to a concrete pump with a placing boom arranged on a substructure, comprising at least two cantilever arms, with at least one cantilever arm being designed according to the invention.
  • width and height of the cantilever arm refer to the dimensions of the cantilever arm as defined for calculating area moment of inertia about a pivot axis of the cantilever arm.
  • the pivot axis of the cantilever arm is an axis about which the cantilever arm can be pivoted directly relative to an adjacent cantilever arm.
  • the fibers or continuous fibers are generally more than 50 mm in length.
  • the length of the fibers is such that they can no longer be processed in an extrusion process. Rather, corresponding endless fibers are usually available as flat raw material or roving, which can then be processed into fiber composite material.
  • “Roving” refers to a bundle, strand or multifilament yarn made up of endless fibers arranged essentially in parallel.
  • a "flat raw material” can be, for example, a woven fabric, scrim, knitted fabric or mesh.
  • the cantilever arm according to the invention is made of fiber composite material, it is possible in principle to save weight compared to a comparable cantilever arm made of steel. Due to the significantly lower specific weight of fiber composite material, a significant weight reduction can often be achieved compared to steel construction, even if a slightly greater wall thickness may have to be selected in order to achieve comparable rigidity.
  • the invention is based on the knowledge that, at least in the case of cranked cantilever arms, a corresponding simple change of material is not readily possible or at least does not provide any major weight savings. This is due, among other things, to the fact that the wall thickness of cranked cantilever arms made of fiber composite material cannot be significantly reduced compared to a version made of steel without reducing the rigidity of the cantilever arm in the area of the crank to a level that is impermissible for use in concrete pumps.
  • the invention has recognized that in the area of the offset, some of the usual loads acting on the cantilever arm, which are originally bending loads, act as torsional loads. Based on this knowledge, the invention provides that this special form of loading in the area of the offset is not counteracted by a greater wall thickness, but rather by a shape adapted to the load. While the height of the cross section of the cantilever arm is greater than the width of the cross section of the cantilever arm away from the cranked area—which makes it particularly easy to absorb bending loads—the width of the cross section of the cantilever arm is in the cranked area greater than or equal to the height of the cantilever arm in cross section. As a result of the cross-sectional adaptation according to the invention, it is often already possible to achieve sufficient rigidity, even in the area of the offset, without an increase in the wall thickness being necessary.
  • the cantilever arm is bent in a plane perpendicular to the bending load. Only in this case do the torsional loads in question occur.
  • the cantilever arm can be cranked in a plane that runs parallel to at least one of the pivot axes about which the cantilever arm can be pivoted relative to an adjacent cantilever arm. With a corresponding cranking, the juxtaposition of boom arms known from the prior art is possible when folding a boom.
  • the wall thickness in the area of the bend is smaller than or essentially the same as the wall thickness away from the bend.
  • the height of the cantilever arm in cross section in the area of the bend is preferably equal to the height of the cantilever arm in cross section away from the bend, this height often corresponding to the maximum available overall height for the cantilever arm for reasons of rigidity.
  • the fact that the height is the same over the entire length of the cantilever arm ensures that the bending loads acting on the cantilever arm are evenly absorbed over its entire length.
  • the cantilever arm is tapered in height from one end to the other end, the height is higher at one end than at the other end.
  • the height of the cantilever arm in cross section tapers evenly over the area of the bend.
  • a gradual adjustment of the height should be dispensed with.
  • transition between the cross section of the cantilever arm away from the bent area and the cross section of the cantilever arm in the bent area is fluid in such a way that no additional notch effect occurs as a result of the transition.
  • a corresponding transition means that additional stresses on the fiber composite material, which could in principle occur as a result of unfavorable shaping of the cantilever arm, are avoided.
  • the cross section of the cantilever arm in the cranked area is based on an essentially octagonal basic shape with p4 symmetry, the edges forming the axes of symmetry preferably being larger than the other edges and/or the edges running in the direction of the width of the cross section being longer than the Edges running in the direction of the height of the cross-section.
  • the bending and torsional loads occurring in the cranked area can be well absorbed by appropriate shaping.
  • the cross section of the cantilever arm away from the cranked area is based on an essentially octagonal basic shape with a p4 symmetry, the edges forming the symmetry axes being preferably larger than the other edges and/or the edges running in the direction of the height of the cross section being longer than the edges running in the direction of the width of the cross-section. Since the bending stresses dominate in the area away from the bend, the cross section has been optimized to that effect.
  • the cantilever arm is convexly curved outwards in cross-section at least on part of the edges of the cantilever arm, and this can apply both to the area of the bend and away from it.
  • the torsional rigidity of the cantilever arm can be increased by a corresponding partially convex shape.
  • the corners in the cross section of the cantilever arm are rounded. Stress peaks can be avoided or at least reduced by appropriately rounded corners.
  • the cantilever arm preferably has at least one through-opening as an articulation point, with the opposite areas of the outer surfaces of the cantilever arm, into which one of the through-openings opens, being configured parallel to one another. Since the outer surfaces are arranged parallel to one another in the area of a corresponding through-opening through which, for example, a hinge pin can be guided, the connection of the cantilever arm according to the invention to other components, such as, for example, another cantilever arm, is simplified.
  • the cantilever arm is preferably made of continuous fiber-reinforced fiber composite material and can be formed from fiber scrim, fiber fabric, fiber mesh or a combination thereof. Particularly in the case of a fiber fabric, it is possible to optimally place the individual fibers or rovings in a mold for the cantilever arm. It is also possible to use specially manufactured preform scrims in which the individual fibers are attached to a carrier fabric in the desired course, for example by sewing.
  • the cantilever arm is made from prefabricated mats by lamination.
  • the fibers can be arranged differently.
  • An essentially quasi-isotropic arrangement of ⁇ 0°/+45°/ ⁇ 90°/-45° or ⁇ 0°/+30°/+60°/ ⁇ 90°/-60°/-30° is possible.
  • the layers can be laminated individually or in the form of prefabricated multi-layer fabrics. It is also possible to use unidirectional scrims that are laid in a mold for the cantilever arm according to the expected loads.
  • the fibers can be laid wet (ie impregnated with the matrix material), dry (with subsequent introduction of the matrix material) or in the form of prepregs (fibers impregnated with duroplastic matrix material).
  • resin preferably epoxy resin, can be used as the matrix material.
  • the core material can be made of balsa wood or foam, for example.
  • the mobile concrete pump 1 shown with the placing boom 2 is a truck-mounted concrete pump in which the placing boom 2 is attached to a mobile substructure 3 .
  • the placing boom 2 can be folded up and for this purpose comprises several extension arms 5 which can be pivoted relative to one another by hydraulic cylinders 4 and in which a conveying line 6 (only partially shown) for flowable concrete is guided.
  • Flowable concrete can be conveyed from the feed hopper 8 through the conveying line 6 to the free, open end 6 ′ of the conveying line 6 with the aid of a core pump 7 arranged on the substructure 3 .
  • two of the cantilever arms 5 of the concrete pump 1 are off figure 1 shown individually, one of the two cantilever arms 5 being cranked and at least the cranked cantilever arm 5 being made of continuous fiber-reinforced fiber composite material.
  • the two cantilever arms 5 are connected via a pivot pin 9 so that they can pivot relative to one another.
  • the cranked boom arm 5 in figure 2 comprises a cranked area 12 arranged between the first end 10 and the second end 11 of the cantilever arm 5, the cranked portion lying in a plane parallel to the pivot pin 9 or the pivot axis defined thereby.
  • a cross-section through the cantilever arm 5 in the bent area is shown, while in figure 4 a cross-section through the same cantilever arm 5, but away from the bent area 12 is shown.
  • both cross-sections are based on an octagonal basic shape 13 with edges 15, 15', 15" shown as dashed lines and corners 14 shown by markings, which - as shown by the symmetry axes 16 shown as dashed lines - each have p4 symmetry those edges 15, 15' which are used to form the axes of symmetry 16 are longer than the edges 15'' which do not intersect any axes of symmetry 16.
  • both in the area of the offset 12 (cf. figure 3 ) as well as apart from it (cf. figure 4 ) is at the edges 15, 15 'of the extension arm 5 convexly curved outwards.
  • the curvature is designed in such a way that the cantilever arm 5 has a constant height h over its entire length. Accordingly, the in figure 2 visible top of the extension arm 5 without steps. also in figure 2 it can be seen that the transition from the cross section of the cantilever arm 5 in the bent area 12 to the cross section away from this area 12 is so fluid that the change in cross section does not produce any additional notch effect.
  • the cantilever arm 5 is rounded in cross-section at the corners 14 (cf. figure 3 and 4 ).
  • FIG 4 is also shown that the cantilever arm 5 is extended outwards in certain areas such that two opposite parallel outer surfaces 17 result.
  • a through opening 18 (only the axis of which is shown) is provided on these parallel outer surfaces 17, e.g. for the passage of the hinge pin 9 (cf. figure 2 ) intended.
  • Corresponding outer surfaces 17 can also be provided in areas of other feedthrough openings 18 .
  • the cantilever arm 5 is made in one piece from continuous fiber-reinforced fiber composite material, with the cantilever arm 5 being laminated from prefabricated mats using known methods. Over the entire length of the cantilever arm 5, the number of elements used to create the structure is constant when viewed over the cross section. As a result, the cross-sectional area also remains constant over the entire length of the cantilever arm 5 . Since the cross section of the cantilever arm 5 in the area of the bend 12 (cf. figure 3 ) but has a larger scope than outside this range (cf. figure 4 ) the wall thickness in the area of the bend 12 is slightly reduced in individual partial areas in order to continue to achieve the same cross-sectional area.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
EP18725450.3A 2017-05-12 2018-05-09 Gekröpfter auslegerarm aus faserverbundmaterial mit veränderlichem querschnitt für mobile betonpumpen und betonpumpe Active EP3622133B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017208031.0A DE102017208031A1 (de) 2017-05-12 2017-05-12 Gekröpfter Auslegerarm mit veränderlichem Querschnitt für mobile Betonpumpen
PCT/EP2018/062109 WO2018206703A1 (de) 2017-05-12 2018-05-09 Gekröpfter auslegerarm mit veränderlichem querschnitt für mobile betonpumpen

Publications (2)

Publication Number Publication Date
EP3622133A1 EP3622133A1 (de) 2020-03-18
EP3622133B1 true EP3622133B1 (de) 2022-04-20

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ID=62196542

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Application Number Title Priority Date Filing Date
EP18725450.3A Active EP3622133B1 (de) 2017-05-12 2018-05-09 Gekröpfter auslegerarm aus faserverbundmaterial mit veränderlichem querschnitt für mobile betonpumpen und betonpumpe

Country Status (6)

Country Link
US (1) US11952788B2 (zh)
EP (1) EP3622133B1 (zh)
KR (1) KR102327429B1 (zh)
CN (1) CN110621833B (zh)
DE (1) DE102017208031A1 (zh)
WO (1) WO2018206703A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022164579A (ja) 2021-04-16 2022-10-27 信越化学工業株式会社 生体電極組成物、生体電極、及び生体電極の製造方法

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WO2014019887A1 (de) * 2012-08-02 2014-02-06 Putzmeister Engineering Gmbh Betonverteilermast für betonpumpen

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Also Published As

Publication number Publication date
DE102017208031A1 (de) 2018-11-15
CN110621833A (zh) 2019-12-27
WO2018206703A1 (de) 2018-11-15
KR102327429B1 (ko) 2021-11-17
US20200199897A1 (en) 2020-06-25
CN110621833B (zh) 2022-05-31
EP3622133A1 (de) 2020-03-18
US11952788B2 (en) 2024-04-09
KR20200006069A (ko) 2020-01-17

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