RU2791620C1 - System of profiles for creating a lock joint - Google Patents

Abstract

FIELD: profiles production.

SUBSTANCE: invention relates to the production of profiles having side edges specially designed to engage one with the other, with the formation of a locking connection, which can be used mainly in the connection of wall-forming sheet pile welded elements to create sheet pile walls, as well as in the connection of concrete blocks of a road barrier. The system of profiles for creating a lock connection contains two profiles: the first is a female profile, consisting of a strip part and a U-shaped side edge, the end sections of which, bent inward, form an open cavity for placing the side edge of the second profile in it, the end sections of the U-shaped the edges are made symmetrical about the axis of the profile, the second - a profile with a T-shaped edge, consisting of a shelf with symmetrically curved edges and with the possibility of its placement in an open cavity formed by the end sections of the U-shaped side edge of the first profile, and the angle α of the bend of the edges of the shelf T -shaped profile is less than 90°, and the bend angle of the end sections of the U-shaped edge of the strip profile is equal to α+90°, and the strip part, the symmetry axis of which coincides with the shelf symmetry axis. The end sections of the profile with a U-shaped edge with a thickness a>0 on the outside throughout the entire length of the rounding have a thickening with a constant value b>0, the inner radius of the end sections is equal to R₁>0, the outer radius of the end sections is equal to R₂=R₁+a+b, the U-shaped side edge with a thickness a>0 on the outer side has a thinning, which throughout the entire length of the convex rounding has a constant value c>0, and throughout the entire length of the concave rounding smoothly decreases from c>0 at the junction point of the convex and concave rounding to 0 at the point of contact with the strip part. The inner radius of the U-shaped side edge is equal to R₃>0, the outer radius of the convex rounding of the U-shaped side edge is R₄=R₃+a-c and smoothly mates with the outer radius of the concave rounding R₅>0 of the U-shaped side edge.

EFFECT: increasing the strength of the profile with a U-shaped edge while reducing the metal consumption of the interlock.

2 cl, 1 tbl, 5 dwg

Description

The invention relates to the production of profiles having side edges specially designed to engage one with the other, with the formation of a locking connection, which can be used mainly in the connection of wall-forming sheet pile welded elements to create sheet pile walls, as well as in the connection of concrete blocks of a road barrier.

As a prototype, a system of profiles for creating an interlock was chosen (RF patent No. 93092, E02D 5/12, publ. 20.04.2010). This system contains two profiles: the first is symmetrical with a U-shaped edge forming an open cavity and a strip part, the second is symmetrical with a T-shaped edge and a strip part. The lock connection is created by placing the T-shaped edge of the second profile in the open cavity of the U-shaped edge of the first profile.

The disadvantage of the prototype is illustrated by Figure 1 - The system of profiles for creating a lock connection from the description of the utility model to the patent of the Russian Federation No. 93092.

The normal bending stress from the action of the load P, stretching the lock connection, with the same thickness of the elements equal to a, and the section modulus can be found using the formulas from the course of strength of materials (Course of strength of materials with examples and tasks: textbook / V.I. Vodopyanov, A. N. Savkin, O. V. Kondratiev, VolGTU, Volgograd, 2012, 136 p.):

- at point A (farthest from the line of force N): σ(A)=M(A)/W(A);

- at point C (beginning of the internal rounding of the U-shaped edge): σ(C)=M(C)/W(C),

- at point E (the beginning of the internal rounding of the end section): σ(E)=M(E)/W(E),

Where

- M(A) - bending moment at point A, M(A)=AB*N=AB*P/2/cos(α);

- W(A) - moment of resistance at point A, W(A)=L*(a^2)/6, where L - profile length;

- M(C) - bending moment at point C, M(C)=CD*N=CD*P/2/cos(α);

- W(C) - moment of resistance at point C, W(C)=L*(a÷2)/6.

- M(E) - bending moment at point E, M(E)=EF*N=EF*P/2/cos(α);

- W(E) - moment of resistance at point E, W(E)=L*(a^2)/6.

At the same time, at all points below from the line of action of the force N to the axis of symmetry, the bending moment contributes to the closure of the interlock in tension, so the bending stresses in them can be ignored when considering the issue of the strength of the interlock at break (opening).

As a result, we get:

σ(A)=3*AB*P/(cos(α)*L*(a^2)); σ(C)=3*CD*P/(cos(α)*L*(a^2));

σ(E)=3*EF*P/(cos(α)*L*(a^2)).

It follows from these formulas that the stress is directly proportional to the arm of the normal force N. Since the arm decreases further than the maximum AB, then at point C (and close to it from the upper side of the line of action of the force N), the stress will be much less than the maximum with the same thickness of the elements equal to A. This leads to excessive metal consumption of a symmetrical profile with a U-shaped edge.

In the present invention, a system of profiles for creating an interlock connection is proposed, containing two profiles: the first is a female profile, consisting of a strip part and a U-shaped side edge, the end sections of which, bent inward, form an open cavity for placing the side edge of the second profile in it, the end sections of the U-shaped edge are made symmetrical about the axis of the profile, the second - a profile with a T-shaped edge, consisting of a shelf with symmetrically curved edges and with the possibility of its placement in an open cavity formed by the end sections of the U-shaped side edge of the first profile, and the angle α of the bend of the edges of the shelf of the T - shaped profile is less than 90 °, and the angle of bend of the end sections of the U-shaped edge of the strip profile is α + 90 °, and the strip part, the symmetry axis of which coincides with the axis of symmetry of the shelf, characterized in that the end sections of the profile with With a U-shaped edge with a thickness a> 0 on the outside, throughout the entire length of the rounding, they have a thickening with a constant value b>0, the inner radius of curvature of the end sections is R ₁ >0, the outer radius of curvature of the end sections is R ₂ =R ₁ +a+b, the U-shaped side edge with a thickness a>0 on the outside has a thinning, which throughout the entire length of the convex rounding has a constant value c>0, and throughout the entire length of the concave rounding it gradually decreases from c>0 at the junction point of the convex and concave rounding to 0 at the point of junction with the strip part, the inner radius of the rounding of the U-shaped side edge is equal to R ₃ >0, the outer radius of the convex rounding of the U-shaped side edge is R ₄ =R ₃ +ac and smoothly mates with the outer radius of the concave rounding R ₅ >0 of the U-shaped side edge.

The production of profiles can be carried out by hot pressing from a round billet, followed by straightening and cutting operations.

The technical result to which the invention is directed is to increase the strength of the profile with a U-shaped edge while reducing the metal consumption of the interlock.

The specified technical result is achieved by the fact that in the proposed system of profiles for creating a lock connection, the end sections of the profile with a U-shaped edge with a thickness a>0 on the outer side throughout the entire length of the rounding have a thickening with a constant value b>0, the inner radius of the end sections is equal to R ₁ >0, the outer radius of the curvature of the end sections is R ₂ =R ₁ +a+b, the U-shaped side edge with a thickness a>0 on the outer side has a thinning, which has a constant value c>0 over the entire length of the convex rounding, and throughout the entire length of the concave curvature smoothly decreases from c>0 at the junction point of the convex and concave curvature to 0 at the point of junction with the strip part, the inner radius of the U-shaped side edge is equal to R3>0, the outer radius of the convex curvature of the U-shaped side edge is equal to R ₄ =R ₃ +ac and smoothly mates with the outer radius of the concave rounding R ₅ >0 U-shaped side edge.

More specifically, in the present invention, with the same thickness equal to a, and the same geometry of other elements for the described system of profiles, in comparison with the prototype, the magnitude of the bending stresses from the action of the load P, tensile interlock, will change:

- at point A (farthest from the line of force N): σ(A)=3*AB*P/(cos(α)*L*((a+b)^2));

- at point C (the beginning of the internal rounding of the U-shaped edge): σ(C)=3*CD*P/(cos(α)*L*((a-c)^2)).

- at point E (the beginning of the internal rounding of the end section): σ(E)=3*EF*P/(cos(α)*L*(a^2)).

It follows from these formulas that the thickening of the b value makes it possible to reduce the maximum stress at point A, and the thinning of the c value makes it possible to increase the stress at the point C, thereby bringing it closer to the maximum. Since the length of the section with thickening is less than the length of the section with thinning, then by varying the values of thickening with the value b and thinning with the value c, it is possible to achieve a simultaneous increase in strength and a decrease in the cross section of the profile with a U-shaped edge, i.e. reducing the metal consumption of the interlock. The greatest reduction in metal consumption can be achieved with such combinations of thickening with the value of b and thinning with the value of c, at which the equality σ(A)=σ(C)=σ(E) is fulfilled.

The essence of the present invention is further illustrated by the following graphics.

Fig. 1 - System of profiles for creating an interlock from the description of the utility model to the patent of the Russian Federation No. 93092.

Fig. 2 - System of profiles for creating an interlock according to the present invention.

Fig. 3 - View of the welded sheet pile wall (option 1)

Fig. 4 - View of the welded sheet pile wall (option 2)

Fig. 5 - View of the connection of concrete blocks of the road fence;

Where

1 - profile with a U-shaped edge (prototype);

2 - profile with a T-shaped edge;

3 - profile with a U-shaped edge (the present invention);

4 - strip part;

5 - U-shaped side edge;

6 - end section;

7 - open cavity;

8 - thickening;

9 - thinning;

10 - shelf;

11 - symmetrically curved edge;

12 - strip part;

13 - welded seam;

14 - hot-rolled strip;

15 - pipe;

16 - reinforcing bar;

17 - concrete block.

A profile with a U-shaped edge 3, consisting of a strip part 4 and a U-shaped side edge 5, the end sections 6 of which, bent inwards, form an open cavity 7 for placing a side edge of another profile in it. The end sections 6 of the U-shaped edge 5 are made symmetrical about the axis of the profile. The end sections 6 with a thickness a>0 on the outer side throughout the entire length of the rounding have a thickening 8 with a constant value b>0. The inner radius of the end sections 6 is R ₁ >0, the outer radius of the end sections 6 is R ₂ =R ₁ +a+b. The U-shaped side edge 5 with a thickness a>0 on the outer side has a thinning 9, which throughout the entire length of the convex rounding has a constant value c>0, and throughout the entire length of the concave rounding it gradually decreases from c>0 at the junction point of the convex and concave rounding to 0 at the point of junction with the strip part 4. The inner radius of the rounding of the U-shaped side edge 5 is equal to R ₃ >0, the outer radius of the convex rounding of the U-shaped side edge 5 is equal to R ₄ =R ₃ +ac and smoothly mates with the outer the radius of the concave rounding R ₅ >0 U-shaped side edge 5.

A profile with a T-shaped edge 2, consisting of a shelf 10 with symmetrically curved edges 11 and with the possibility of its placement in an open cavity 7 formed by the end sections 6 of the U-shaped side edge of the first profile, and a strip part 12, the symmetry axis of which coincides with the axis shelf symmetry 10.

The bending angle α of the edges 11 of the flange 10 of the profile with a T-shaped edge 2 is less than 90°, and the bending angle of the end sections 6 of the profile with a U-shaped edge 3 is equal to α+90°.

Preferred ranges of the indicated values:

a - 8 ... 14 mm; b - 0.5…3 mm; c - 0.5…3 mm; R ₁ - 3 ... 6 mm; R ₂ - 11.5 ... 23 mm; R ₃ - 8 ... 12 mm; R ₄ - 13 ... 25.5 mm; R ₅ - 10…20 mm.

The results of comparing the parameters of a specific embodiment of the profile system according to the present invention and the prototype according to RF patent No. 93092 are shown in Table 1.

From table 1 it follows that for the described system, in comparison with the prototype, the bending stresses at point A are reduced from 137.8 MPa to 127.0 MPa, at point C they increase from 46.9 MPa to 51.1 MPa, at point E do not change and remain 125.1 MPa. The stress at points C and E did not exceed the stress at point A, so the increase in strength of the profile with a U-shaped edge can be expressed as σ(A prototype)/σ(A described system)=137.8/127.0=1.085 times. At the same time, the reduction in metal consumption for the described system, in comparison with the prototype, can be expressed as Mass of 1 meter (prototype)/Weight of 1 meter (described system)=23.29/23.23=1.0026 times. Thus, a simultaneous increase in the strength of the profile with a U-shaped edge and a decrease in the intensity of the interlock connection relative to the prototype is achieved.

The production of profiles is carried out by hot pressing from a round billet, followed by straightening and cutting operations.

The system of profiles for creating an interlock connection can be used mainly in the connection of wall-forming sheet pile welded elements to create sheet pile walls (Fig. 3, 4), as well as in the connection of concrete blocks of a road fence (Fig. 5).

Claims (2)

1. The system of profiles for creating a lock connection, containing two profiles: the first is a female profile, consisting of a strip part and a U-shaped side edge, the end sections of which, bent inward, form an open cavity for placing the side edge of the second profile in it, the end sections U-shaped edges are made symmetrical about the axis of the profile, the second - a profile with a T-shaped edge, consisting of a shelf with symmetrically bent edges and with the possibility of its placement in an open cavity formed by the end sections of the U-shaped side edge of the first profile, and the bend angle α edges of the flange of the T-shaped profile is less than 90°, and the angle of bending of the end sections of the U-shaped edge of the strip profile is α+90°, and the strip part, the axis of symmetry of which coincides with the axis of symmetry of the shelf, characterized in that the end sections of the profile with U- with a shaped edge with a thickness a>0 on the outside, throughout the entire length of the rounding, they have a thickening with a constant value b>0, inside the lower radius of curvature of the end sections is R ₁ >0, the outer radius of curvature of the end sections is R ₂ \u003d R ₁ +a + b, the U-shaped side edge with a thickness a> 0 on the outside has a thinning, which throughout the entire length of the convex rounding has a constant value c>0, and throughout the entire length of the concave rounding smoothly decreases from c>0 at the junction point of the convex and concave rounding to 0 at the point of junction with the strip part, the inner radius of the U-shaped side edge is R ₃ >0, the outer the radius of the convex rounding of the U-shaped side edge is equal to R ₄ =R ₃ +ac and smoothly mates with the outer radius of the concave rounding R ₅ >0 U-shaped side edge. 2. The system of profiles according to claim 1, characterized in that the profiles are made by hot pressing from a round billet.

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