Z-shaped sheet pile

Abstract

The invention relates to building materials, and more particularly to Z-shaped Larssen-type sheet profiles that can be produced by hot rolling, and is applicable in the building industry. Z-shaped sheet pile comprises flanges (1) connected to one another by a web (2), the web being inclined at an angle α, forming a Z-shape with a total height H, wherein the free ends of the flanges (1) have locks (3) arranged thereon. The web (2) has a non-uniform thickness. At the edges, the web has a thickness of s1, and at a narrowing in the centre, the web has a thickness of s2, the difference in thickness causing a narrowing defined by a radius R. The invention provides an increase in the section modulus of a sheet pile wall, while at the same time the flange is thinner at the narrowing, making it possible to use a lighter pile for a more heavily loaded sheet pile wall.

Description

[0001] Z-TYPE SHEET PILE

[0002] Field of technology

[0003] The invention relates to building materials, in particular to Z-shaped sheet pile profiles produced by hot rolling, and can be used in the construction industry.

[0004] Prior art

[0005] The sheet pile RU 2740561 C1, 15.01.2021 is known, where additional elements in the form of shoulders were used above the concave corners as a solution to increase the wall resistance.

[0006] A U-shaped sheet pile RU 2787097 C1, 28.12.2022, is known, made of metal and containing a base with walls bent towards each other with locks at the ends, wherein the inner and outer bending angles of the wall and the base are rounded, and the inner and outer bending angles of the wall and the base are rounded in such a way that the ratio of the rounding radii of the inner and outer corner is in the range from 2.1 to 2.2, to ensure an increase in the concentration of the material contained in the cross-section of the sheet pile, in particular, at the bending points of the walls and the base.

[0007] A welded trough-type sheet pile RU 199197 U1, 21.08.2020, is known, which comprises a shelf and inclined walls permanently attached to it at an obtuse angle (95-140°), equipped with connecting elements at the ends. In this case, the entire shelf and both inclined walls are made in the form of separate parts from hot-rolled strips of structural steel grades S420MC, S460MC, S500MC, S550MC, S600MC with a high yield strength according to the DIN EN 10149-2:2013-12 EN standard. The shelf and inclined walls are connected to each other by welding.

[0008] The disadvantages of all the above-mentioned sheet piles are the U-shaped form of the sheet pile, where in the connection the locks are located on the shelf of the sheet pile, and when assembled into a wall they are located on the middle plane of the wall, which creates a high concentration of metal in the middle plane of the wall, where the effect on the moment of resistance of the wall is minimal.

[0009] The most promising and effective in terms of increasing the bearing capacity, with a lower mass of the sheet pile wall, are Z-shaped sheet piles, where the locks are located at the bases of the sheet pile wall.

[0010] The following models of Z-type sheet piles are known: Arcelor AZ 48-700, AZ 50-700, AZ 52-700.

[0011] The prototype is the Arcelor AZ 28-700 sheet pile. The disadvantage of these sheet piles is that, taking into account the different configurations in accordance with Table No. 1, the specific coefficient of effective material use (CEM) does not exceed 17.58 for Z-shaped sheet piles and does not exceed 16.0 for U-shaped sheet piles.

[0012] The technical result, which the proposed invention is aimed at achieving, is an increase in the specific material utilization index for a sheet pile, which is determined by the ratio of the moment of resistance of the sheet pile wall to the mass of 1 m of the sheet pile wall, which depends on the mass of 1 m of the pile length and the interlock distance.

[0013] KHM=W / M (1)

[0014] Where: KIM is the specific coefficient of effective use of material;

[0015] W - moment of resistance of the sheet pile wall;

[0016] M - mass of 1 m 2 sheet pile wall.

[0017] Table 1. Comparison of inertial and mass indicators of sheet piles (sheet piles) of different types. Disclosure of invention

[0018] The main task that this invention is aimed at solving is to increase the moment of resistance of the sheet pile wall while maintaining the mass of the sheet pile, which is possible by changing the configuration of the main elements.

[0019] The technical result is achieved due to the fact that the Z-type sheet pile contains bases connected to each other by a shelf at an angle of inclination of the shelf a, forming a Z-shape with a total height H, and at the free ends of the bases there are locks, the shelf has an uneven thickness, at the edges the thickness of the shelf is si, and in the center the thickness of the shelf by the constriction is S2, while si - S2 = 2. . . 12 mm, and the difference in thickness is formed by the constriction formed by the radius R, where

[0020] The use of such a solution leads to a decrease in the metal concentration in the middle of the shelf and an increase in the moment of resistance of the sheet pile wall, due to a decrease in mass. Redistribution of this metal along the shelf closer to the bases and in the bases themselves will increase the moment of resistance with the same mass.

[0021] Redistribution of metal concentration along the shelf from the middle to the corners allows increasing the angle between the main axis of inertia of the profile, with a minimum value of the moment of inertia, and the plane of the sheet pile wall, which reduces profile collapse (change in bending direction) during plastic deformation, thereby reducing the load on the locks.

[0022] Implementing a transition in the form of a radius from the middle to the corners eliminates the formation of stress concentrations.

[0023] The metal utilization factor in such a configuration can reach more than 18 (Table 1), all other things being equal.

[0024] At the same time, the reduction in mass and thinning of the wall will not entail a reduction in the strength of the structure, since during the operation of the sheet pile, the main load from the soil is taken up by the foundations, and the shelf is designed to connect them and takes up the tangential load, which will be determined by the angle of inclination of the shelf and will be significantly lower than the load taken up by the foundations.

[0025] F=N cosa f (3)

[0026] Where F is the force perceived by the shelf;

[0027] N is the normal force created by the soil; f is the coefficient of internal friction of the metal against the soil.

[0028] The distribution of the load of the sheet pile wall from the proposed sheet piles occurs in such a way that even with the thinning of the shelf in the S2 clamp, this element of the pile does not become a stress concentrator and has a greater margin of safety than at the base of the sheet pile.

[0029] Brief description of the drawings

[0030] The essence of the invention is explained by the drawing.

[0031] FIG. 1 shows a sheet pile with a thinning of the flange in the clamp, where:

[0032] 1 - base; 2 - shelf; 3 - lock;

[0033] H is the total height of the sheet pile; h is the working height of the sheet pile; B is the total width of the sheet pile; b is the working width of the sheet pile; t is the thickness of the base of the sheet pile; si is the thickness of the flange of the sheet pile; S2 is the thickness of the flange of the sheet pile in the constriction; a is the angle of inclination of the flange; R is the radius forming the constriction.

[0034] Implementation of the invention

[0035] The proposed device comprises bases 1, connected to each other by a shelf 2 at an angle of inclination of the shelf a, forming a Z-shape with a total height of H, with locks 3 located at the free ends of the bases 1, the shelf 2 has an uneven thickness, with the thickness of the shelf at the edges being si, and in the center the thickness of the shelf at the constriction being S2, the difference in thickness is formed by the constriction formed by the radius R, where in this case Si - S2 = 2. . . 12 mm.

[0036] The device works as follows. The pile is installed in a soil driving machine and driven into the ground, where, due to the use of uneven thickness, while maintaining strength characteristics, it increases the useful coefficient of material use.

[0037] Thus, the proposed invention will allow:

[0038] - to maintain both the high moment of resistance of the sheet pile wall and the strength characteristics, with thinning of the flange in the clamp, which will allow using a lighter sheet pile for a more loaded sheet pile wall to retain soil and will create savings in the use of metal; to obtain a structure of this type of sheet pile by rolling on specialized mills with minor modifications to the calibration of the rolls, which allows retooling the existing production for a sheet pile of this type without significant costs; - to maintain the rigidity of the structure compared to analogs with the same weight, which is a positive effect for eliminating defects when driving a sheet pile into the ground.

Claims

CLAUSES OF THE INVENTION A Z-shaped sheet pile comprising bases (1) connected to each other by a shelf (2) at a shelf inclination angle a, forming a Z-shape with a total height of H, wherein locks (3) are located at the free ends of the bases (1), characterized in that the shelf (2) has an uneven thickness, wherein at the edges the thickness of the shelf is si, and in the center the thickness of the shelf along the constriction is S2, the difference in thickness is formed by the constriction, formed by the radius R, where WITH THIS Si - S2 = 2...12 mm.

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