POINT-SUPPORTED ELEMENT OR FLAT CONCRETE CEILING
First Claim
1. Point-supported element or flat concrete ceiling, with a transverse force and punching shear reinforcement, in which there is incorporated at least one lattice beam which runs in the longitudinal direction at least approximately to a support vertical axis and which comprises two spaced-apart lower chords and either at least one continuous upper chord or anchoring elements arranged one behind the other with free intermediate spacings and at least one serpentine diagonal strut section with upper and lower bent portions between in each case two successive diagonal struts, said bent portions being secured to the lower and upper chords or to the lower chords and the anchoring elements at securing points, wherein the diagonal struts of each serpentine diagonal strut section in the lattice beam are inclined in the same direction upwards and towards a support, and that at least in the end region of the at least one lattice beam at the support, at least the diagonal strut closest to the support is inclined at a steeper angle (α
- )<
90°
relative to the lower chords and the preceding diagonal strut remote from the support is inclined at an angle that is at least 10°
flatter, 45°
<
(α
2)<
90°
, such that, of upper and lower concrete anchoring zones formed in the region of the securing points at least of the diagonal strut that is closest to the support and is inclined at the steeper angle, the upper concrete anchoring zone lies closer to the support vertical axis than the lower concrete anchoring zone.
1 Assignment
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Accused Products
Abstract
The invention relates to a point-supported element or flat concrete ceiling (BD) that comprises a transverse force and punching reinforcement (B) into which a lattice beam (1) that tapers on a support vertical axis (A) is integrated, wherein the lattice beam comprises lower chords (U) and a continuous upper chord (O) or anchoring elements (10) arranged with open spaces (Z) between one another and at least one serpentine diagonal strut section (D) with upper and lower bent portions (11, 12) between each two successive diagonal struts (S1, S2), said bent portions being secured in securing points (SO, SU). The diagonal struts (S1, S2) are angled in the same manner upwards and in the direction of the support (T). The diagonal strut (S1) nearest to the support is inclined at a steeper angle (α)<90° relative to the lower chords (U), and the preceding diagonal strut (S2) further from the support is inclined at an angle, which is flatter by at least 10°, of 45°≦(α2)<90° such that, of the concrete anchoring zones (VO, VU) formed by the diagonal strut (S1) nearest to the support, the upper concrete anchoring zone (VO) lies closer to the support vertical axis (A) than the lower concrete anchoring zone (VU).
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Citations
18 Claims
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1. Point-supported element or flat concrete ceiling, with a transverse force and punching shear reinforcement, in which there is incorporated at least one lattice beam which runs in the longitudinal direction at least approximately to a support vertical axis and which comprises two spaced-apart lower chords and either at least one continuous upper chord or anchoring elements arranged one behind the other with free intermediate spacings and at least one serpentine diagonal strut section with upper and lower bent portions between in each case two successive diagonal struts, said bent portions being secured to the lower and upper chords or to the lower chords and the anchoring elements at securing points, wherein the diagonal struts of each serpentine diagonal strut section in the lattice beam are inclined in the same direction upwards and towards a support, and that at least in the end region of the at least one lattice beam at the support, at least the diagonal strut closest to the support is inclined at a steeper angle (α
- )<
90°
relative to the lower chords and the preceding diagonal strut remote from the support is inclined at an angle that is at least 10°
flatter, 45°
<
(α
2)<
90°
, such that, of upper and lower concrete anchoring zones formed in the region of the securing points at least of the diagonal strut that is closest to the support and is inclined at the steeper angle, the upper concrete anchoring zone lies closer to the support vertical axis than the lower concrete anchoring zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- )<
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18. A concrete ceiling point supported element comprising:
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an upper cord extending longitudinally having a concrete anchoring zone end; a plurality of parallel lower cords extending longitudinally and parallel to said upper cord; a plurality of serpentine diagonal strut sections having first and second alternating diagonal struts, each of said plurality of serpentine diagonal strut sections having upper bent and lower bent portions, the upper bent portions of each of said plurality of serpentine diagonal strut sections attached to said upper cord, and the lower bent portions of one of said plurality of serpentine diagonal struts attached to one of said plurality of parallel lower cords and the lower bent portions of another one of said plurality of serpentine diagonal struts attached to another one of said plurality of parallel lower cords, whereby the first and second alternating diagonal struts extend between and transvers to said upper cord and said plurality of parallel lower cords; wherein one of the first alternating diagonal struts is adjacent and spaced from the concrete anchoring zone end and transverses said upper cord and said plurality of lower cords at a first angle of between eighty-five degrees and seventy-five degrees angling towards the concrete anchoring zone; and wherein the second alternating diagonal struts transvers said upper cord and said plurality of lower cords at a second angle at least ten degrees less than the first angle and angling towards the concrete anchoring zone, whereby propagation of cracks in a concrete ceiling are prevented.
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Specification