SU1368404A1 - Reinforcement skeleton of ferroconcrete girder - Google Patents

Abstract

The invention relates to the production of reinforced concrete structures and can be used in the manufacture of reinforcement cages reinforced concrete beams. It allows to increase the bearing capacity of the reinforcement cage. It contains a longitudinal tension 2 and an unstressed 4 reinforcement with a breakage of its part in the balk span and anchors in the form of plates 5i. Rebar grids 9 are installed in each zone of the reinforcement break. Cross bars 8 and transverse rods of the grid 9 are installed with a certain pitch, for which the dependence on the design resistance of the reinforcement, its cross-sectional area, the length of the anchorage zone and the working height of the beam section, is given, 6 sludge. Q & (L

Description

with

OS

YU)

Fyg, 2

ten

1b

20

. 1368404

The invention relates to the production of reinforced concrete structures and can be used in the manufacture of reinforcement cages reinforced concrete beams.

The purpose of the invention - povpiyeniya bearing capacity reinforcing cage

Figure 1 shows the reinforcement cage, a general view; figure 2 - the node in figure 1; FIG. 3 is a section A-A in FIG. 2; FIG. 4 shows the node P in FIG. on fig.Z - section BB in figure 4; figure 6 - part of the frame, axonometric. The reinforcement cage of reinforced concrete beam 1 contains longitudinal tensioned reinforcement 2, provided with internal anchors 3 at breakpoints, and non-stressed reinforcement 4, also equipped at breakpoints with its anchors made in the form of transverse plates 5 welded to it, which combine all the fittings 4 in the frame. Armature 2 and 4 are located along the height of the frame section in rows. With multi-d-25-n arrangement of reinforcement 4 in the places of its breaks in the span, anchors 5, rigidly attached to the ends of dangling rods, are easy to attach to HeoibopBa-HHM s; and non-d5 -: my armature ur 4 is carried out along the length of the g / roleta so that it provides - |: Q: ts1. correspondence epures izg 1bal; 1 Шх MoyeHTOBj, acting in sections of the beam from the external load, a junction of materials, characterizing:, the ability of the sections. Armature 2 has the following.:; E end of akkier 6

The wall of the base ps of the entire argate is made of welded meshes 7, containing: “: the main transverse armature. round, and in the zones of accretion, the cliffs of the armature are installed with a step b defined by the formula

thirty

where rf, rj

R, Aj. Ul + 1) U g R,

design tensile strengths of transverse and broken longitudinal reinforcement, respectively; A 9 transverse

sections, respectively, of transverse reinforcement j located in one plane of section 5 and of longitudinal reinforcement broken in the section in question; 1 - the length of the anchoring zone. broken armature h is the working height of the beam section.

This step is determined from the condition that the moment in the section passing through the point of breakage of the reinforcement must be equal in magnitude to the moment of the cross section in which all longitudinal reinforcement is fully included in the work.

The destruction of a beam reinforced with such a frame, under the influence of an axle, occurs to a cross section:; and x in the middle part of the span from te3; the density of the entire stress and lateral reinforcement and the subsequent crushing of the concrete of the compressed zone; while the destruction of beams with known reinforcement cages is going

40 hrz pko over an inclined section in the pr-support zones at lower values of the applied load.

proposed by ArmaTakim way

mine in the span of the armature 2 and 4 - the additional 45 frame has more rationally welded nets 9- .. The manufacturing placement of the armature, which raises the grid in advance of the nets 9, covers the longitudinal ap 5ypyry from the cTopi top; The beams ii are attached to the reinforcement 4 either by welding, or by means of: - in the entrance wire 5 so that they form an skeleton with it. The transverse rods of welded meshes 7 and 9 are anchored in the concrete at the most compressed and extended face of the beam.

Its carrying capacity at Edodeist-E. Ii on bglr: for transverse forces, while KCK. ,, 5 likelihood, its pre-neo-; .0 kenky brittle fracture according to m k from sm ti 5 g to the point

oka ankerovkk terminated in Prolee M, OY,

m l l a

oh oh

et e and

Cross-section armature 8 and transverse ster: - ;; nn 9 in the zones of the cliff, d

fittings are installed with a step b defined by the formula

R, Aj. Ul + 1) U g R,

0

B

0

25

thirty

where rf, rj

design tensile strengths of transverse and broken longitudinal reinforcement, respectively; A 9 transverse

sections, respectively, of transverse reinforcement j located in one plane of section 5 and of longitudinal reinforcement broken in the section in question; 1 - the length of the anchoring zone. broken armature h is the working height of the beam section.

This step is determined from the condition that the moment in the section passing through the point of breakage of the reinforcement must be equal in magnitude to the moment of the cross section in which all longitudinal reinforcement is fully included in the work.

The destruction of a beam reinforced with such a frame, under the influence of an axle, occurs to a cross section:; and x in the middle part of the span due to the yield strength of the entire tension and tension of the reinforced concrete of the compressed zone; while the destruction of beams with known reinforcement cages is going

hrz pko over an inclined section in the pr-support zones at lower values of the applied load.

The proposed reinforcement cage has a more rational placement of reinforcement, which increases

its carrying capacity at Eozdeist-E. Ii on bglr: for transverse forces, while KCK. ,, 5 likelihood, it is before its very big brittle destruction according to cm ti 5 g to the point

ny frame has a more rational placement of valves, which increases

oka ankerovkk terminated in Prolee M, OY,

 the framework has more rational reinforcement, which increases

m l l a

oh oh

et e and

, Armara urn with concrete base From apkk, sodrzhash; i z-odolnuyu napr Gaheyu ap; atura

And; tension reinforcement, part of which is broken off in the span of the beam, transverse reinforcement, end and intermediate anchors, characterized in that, in order to increase the bearing capacity, c. each zone of the reinforcement breakage along the length of its anchoring is fitted with reinforcing meshes attached to the non-stressable reinforcement, and the ends of the reinforcement in the breakage zones are united by single intermediate anchors, while the transverse reinforcement and transverse rods of the grids in these zones are installed with the step S, defined by the formula

KiAtl Illli9 h) 1.9

yu 15

CALL

r b

one

R is the calculated resistance of stretching of transverse and dangling longitudinal reinforcement, respectively;

, - cross-sectional area

sections, respectively, of transverse reinforcement located in one plane of section, and longitudinal reinforcement, broken in the section in question;

-1 - the length of the anchoring zone of dangling reinforcement; h is the working height of the beam section.

FIG.

Fig.Z

5-s

Claims (1)

F r u l a inventions Reinforcing frame reinforced concrete beams containing longitudinal tensile reinforcement and not tensile ar3 1363404 maturu, part of which is torn off in the span of the beam, transverse reinforcement, where R ₁ , R _z end and intermediate anchors, characterized in that, in order to increase the bearing capacity, 5 at. each zone of reinforcement breakage along the length of its anchoring is equipped with reinforcing nets attached to A ₍ , A _z fittings, and the ends of the reinforcement in the cliff zones are united by single intermediate anchors, while the transverse reinforcement and the transverse mesh rods in these zones are installed 10 with step S defined by the formula fifteen - one _p _ R ₍ A _f l (1 + 1.9 h) 1, 9 R _z A _z h h design tensile strengths of transverse and torn longitudinal reinforcement, respectively; cross-sectional area, respectively, of transverse reinforcement located in the same plane of the section, and longitudinal reinforcement, torn off in the considered section; the length of the anchoring zone of dangling reinforcement; working height of the beam section.