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Разное

Expansion joint profile Dewmark SG 61

  • деформационный шов
Dewmark
concrete
Get price
SG 61
  • Documentation
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  • Description
  • Technical details
  • Catalog
    Specification
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  • Calculation of base plates and loads
    Calculate
    Selection result
    Application of support plates. Load bearing calculations.

    The use of base plates was the development of the evolution of Omega profiles for concreting work joints. Due to the quick-detachable casing, adjacent to the body of the base plate, and an increase in the area of ​​contact between the base plate and concrete, it was possible to increase the load-bearing loads of the floor.

    The support plates carry and transfer the load between two adjacent sections of the concrete floor, that is, the loaded equipment moves along the finished floor without causing stress in the concrete slab. A concrete slab usually has only about 50% of its bearing capacity at the edges, so the dowels support the slab at the edges and help to support and transfer weight from one slab to another, allowing the slabs to bend slightly, gently transferring the load along its surface.

    Calculation of the bearing capacity of the base plates is given in the British methodological manual TR34 ver. 4 clause 6.5.

    The force on the shear of the base plate is determined by the formula:

    Where - cross-sectional area of the base plate

    - steel yield strength

    Bearing / bending load on the base plate:

    Where


    - distance of load application from the concrete surface; with a symmetrical arrangement, this is equivalent to half the seam opening (see fig.)

    (constant)

    = concrete strength =

    - base plate width

    - base plate thickness

    - the strength of the steel of the base plate (taken equal to the yield strength of the steel)

    Loader category by size
    Category , m , m , m
    G1 0,85 1,00 2,60
    G2 0,95 1,10 3,00
    G3 1,00 1,20 3,30
    G4 1,20 1,40 4,00
    G5 1,50 1,90 4,60
    G6 1,80 2,30 5,10

    Loader category Weight Limit, kN Lifting capacity, kN Axle load*, kN Wheel load*, kN Distributed load per m2, (kN/м2) Wheel-to-surface contact area, mm mm
    Loader G1 31 10 26 12,5 12,5 200х200
    Loader G2 46 15 40 15 15 200х200
    Loader G3 69 25 63 31,5 17,5 200х200
    Loader G4 100 40 90 45 20 200х200
    Loader G5 150 60 140 70 20 200х200
    Loader G6 190 80 170 85 20 200х200

    * - shock-free


  • Photos

    • profile photo for expansion joints SG 61 Dewmark
    • profile photo for expansion joints SG 61 Dewmark
    • profile photo for expansion joints SG 61 Dewmark
    • profile photo for expansion joints SG 61 Dewmark
    • profile photo for expansion joints SG 61 Dewmark
    • profile photo for expansion joints SG 61 Dewmark
    • profile photo for expansion joints SG 61 Dewmark
    • profile photo for expansion joints SG 61 Dewmark
    • profile photo for expansion joints SG 61 Dewmark
    • profile photo for expansion joints SG 61 Dewmark
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  • Description

    The classic profile for working concreting joints for floors with high loads.

    With top strips 10 mm thick and different types of base plates depending on the nature and intensity of the load.

    Benefits
    • Protection of joint edges against chipping under loads.
    • The unique system of aligning the top strips by means of spacers allows for differences between them not exceeding 0.1 mm.
    • Use of special anchor fasteners - flexible Nelson stops. Arc-welded anchor stops securely fix the profile in concrete along its entire length.
    • Prevents vertical movement of adjacent concrete slabs through the use of base plates, which effectively transfer the load between them, ensuring a level floor surface.
    • Allows you to control the horizontal movement of the concrete slab and prevent accidental cracks.
    • Allows to achieve divergence of adjacent slabs at a distance of up to 25 mm.
    Distinctive features

    The Dewmark Concrete SG 61 profile is characterized by high shock loads when wheeled vehicles pass through the expansion joint formed during shrinkage. Due to such loads, reliable anchoring of the upper strip in the concrete body is required.

    In order to avoid cracking of the slab under shock loads, the welded elements used in the production of profiles must withstand tensile and bending loads. Anchor stops used in Dewmark profiles have limited flexural flexibility, which prevents cracking of the slab concrete during construction. It is because of this property that the anchor stops are called "flexible". The minimum deflection in standard shear tests is specified in Eurocode 4.

    Anchor stops are made of mild steel by cold forming (cold heading).


    Anchor stop welding technology

    For fastening anchor stops, the technology of contact-arc welding is used, better known as Stud Welding Drawn Arc - elongated arc welding. This technology allows you to weld various combinations of materials, creating high-quality structures for a wide variety of construction industries.


    Welding process

    When using Stud Welding Drawn Arc technology, the arc, with a high current, melts the end of the anchor stop and the welded surface in a short time (from 0.5-1 s for stops with a diameter of 10 mm). In this case, the current strength reaches 2500 A. At the end of welding, the stop is immersed in the weld pool. The result is a joint over the entire surface with characteristics exceeding the strength of the materials of the stop and the surface to be welded.

    This technology, in terms of the quality and degree of welding, is several times superior to welding with a conventional electrode: with this technology, the anchor stop (Nelson's flexible stop) is welded into a single whole with the profile body (see Fig. And photo) and the welding place cannot be destroyed by any loads and tens of times superior to the use of various staples made of wire or reinforcement as anchor elements. Own production including all cycles: metal cutting, welding, cold heading of anchor stops allows you to control product quality at all stages.

    Flexible anchor stops provide a firm hold in the concrete slab, preventing the strips from rotating or shifting as vehicles pass through the expansion joint.


    anchor stop drawing
    анкерный упор фото

    Negative aspects of using other welded anchor elements

    SG61_1.png

    1. Electrode welding of the anchor stop:

    After electrode welding, a space remains between the anchor element and the strip. If the weld seam breaks down due to corrosion and / or stress, the anchor stop will not function.

    SG61_2.png

    2. Welding wire or reinforcement anchor staples:

    The use of this type of anchorage is the most unreliable solution, since welding is carried out only on one side of the element and under prolonged loads can lead to the destruction of the weld even without corrosion.


  • профиль в разрезе, чертеж SG 61
    профиль в разрезе, чертеж SG 61
    Profile Hp (mm) Hc (mm) A (mm) B (mm) С (mm) D (mm) E (mm) u/c2 (mm) c/c3 (mm) L(mm)
    SG 61-20/90-5 (8; 8XL) 90 100-120 20 40 60 5 | 81 220 250 600 3000
    SG 61-20/110-5 (8; 8XL) 110 125-140 20 40 60 5 | 81 220 250 600 3000
    SG 61-20/130-5 (8; 8XL) 130 145-160 20 40 60 5 | 81 220 250 600 3000
    1 - Data is given for all types of shims that can be used. Select a base plate based on the specified loads (see Calculation of base plates for loads).
    2 u/c -maximum distance between anchor stops.
    3 c/c - distance between base plates.
    For a height of 150 mm and more, the profile is made with an Omega guide to increase the rigidity of the structure and eliminate possible profile deflections during concrete pouring.

    Dewmark Concrtete SG 61 RUS_3.jpg

    Dewmark Concrtete SG 61 RUS_4.jpg

    Profile Hp (mm) Hc (mm) A (mm) B (mm) С (mm) D (mm) E (mm) u/c2 (mm) c/c3 (mm) L(mm)
    SG 61-20/150-5 (8; 8XL) 150 165-180 16 40 80 5 | 81 220 250 600 3000
    SG 61-20/180-5 (8; 8XL) 180 185-210 16 40 90 5 | 81 220 250 600 3000
    SG 61-20/210-5 (8; 8XL) 210 215-240 16 40 100 5 | 81 220 250 600 3000
    SG 61-20/240-5 (8; 8XL) 240 245-270 16 40 120 5 | 81 220 250 600 3000
    SG 61-20/270-5 (8; 8XL) 270 275-300 16 40 140 5 | 81 220 250 600 3000
    1 - Data is given for all types of shims that can be used. Select a base plate based on the specified loads (see Calculation of base plates for loads).
    2u/c - maximum distance between anchor stops.
    3с/c - distance between base plates.
    Decoding the name by example SG 61-20/150-8 HDG
    decoding of the name of the profile Dewmark SG 61
    1 - in this case hot-dip galvanizing of the upper strips;
    2 - in this case 60/OP-8 (see "allowable loads").
    Accessories
    1 Steel strips 10x40
    2 Steel rail 2 mm:
    • straight for profile height 90-130 mm
    3

    Опорная пластина 160х160 мм:

    • 60/OP-5 - 5 mm steel 09G2S (σt=355 MPa)
    • 60/OP-8 - 8 mm steel 09G2S (σт=355 MPa)
    • 60/OP-8XL - 8 mm steel 35HGSA (σт=850 MPa)
    4 Plastic quick-release cover
    5 Anchor stops
    6 Spacer sleeve
    7 Rivet fasteners

    SG 61 accessories
    Materials and manufacturing method of components
    Accessories Material Manufacturing method On request
    Top stripes Steel St3 Laser cutting, calibration Zinc plating - HDG, steel AISI 304 (08Х18Н10) - SS
    Guides Steel 08ps Laser cutting, bending
    Base plate Steel 09G2S or 35 KhGSA Laser cutting Galvanizing - HDG, steel AISI 304 (08Х18Н10) - SS
    Shroud ABS plastic Injection molding
    Anchor stops Steel St3 Cold drop Zinc plating - HDG, steel AISI 304 (08Х18Н10) - SS
    Manufacturing tolerances
    Characteristic Value
    Straightness ± 3 mm/m
    Top curvature ± 1 mm/m
    Curl of the upper bands 1 0/m
    Roughness of the upper edge, no more Rz20
    Length ± 0.5 mm
    Height ± 1 mm
    Permissible loads

    The load transfer between adjacent slabs is carried out by the support plate. The maximum load that a plate can withstand is calculated according to the methodological guide of the British concrete community TR 34 version 4 and depends on the thickness of the metal, the dimensions of the plate, the strength of its material, the size of the structural joint, the concrete grade and the thickness of the concrete.

    (For more information on load calculations based on the size of the base plate and concrete, please refer to the section “Calculation of base plates for bearing loads” or visit the Dewmark Concrete Information Center website).

    SG 61png.png


    Permissible loads at 15 mm joint opening for C20 / 25 concrete 150 mm thick
    Insert type Material Thickness, mm Dimensions, mm Axle load (truck type according to DIN 1055-3) Loader capacity according to DIN 1055-3
    60/OP-5 09Г2С 5 160х160 63 кН (G3)1 25 кН
    60/OP-8 09Г2С 8 160х160 140 кН (G5)1 60 кН
    60/OP-8XL 35ХГСА 8 160х160 170 кН (G6)1 80 кН
    1 - the maximum permissible load for reinforced concrete is indicated. Punching concrete is possible at low slab thicknesses - ask for more information.  
    Profile SG 61-20/5

    Recommended for installation in floors with medium to heavy loads.

    Profile SG 61-20/8

    Suitable for installation in all types of floors.

    Profile SG 61-20/8XL

    Designed for installation in floors with extremely high loads.

    To order
    • Making a profile with top strips 6 or 8 mm thick.
    • Production of a profile or its components from corrosion-resistant stainless steel AISI 304.
    • Calculation of support plates for loads, changing their number and distance between them.

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