RU2775293C1 - Method of erecting a sinusoidal sheet pile wall - Google Patents

Abstract

FIELD: hydraulic engineering; construction.

SUBSTANCE: invention relates to metal sheet piles and sheet pile walls made from them and can be used in hydraulic engineering during construction of sea and river berths, as well as in construction when erecting in soil retaining walls for various purposes, for which additional reinforcement is not needed. Method of erecting a sinusoidal sheet pile wall is characterized by that the sheet pile wall is mounted from sheet piles, which is a segment of a cylindrical metal pipe obtained by its longitudinal section, where on the side edges of the body there fixed are elements of the lock connection, which are used to connect the sheet piles. In the middle part of the sheet piles, plates are welded, each of which represents a segment of a cylindrical metal pipe of the same diameter as used in the sheet pile, but having a smaller length than the pile segment.

EFFECT: improvement of strength characteristics of sheet pile wall, as well as facilitating the process of erection of a sinusoidal sheet pile wall, which does not require additional reinforcement, eliminating the problem of changing the diameter of piles under loads, that is, the problem of ovality.

4 cl, 15 tbl, 8 dwg

Description

The invention relates to metal sheet piles and sheet piles made from them and can be used in hydraulic engineering in the construction of sea and river berths, as well as in construction in the construction of various purpose retaining walls in the ground, which do not require additional reinforcement.

Known metal sheet piles of various configurations.

Known sheet pile wall, described in the patent RU 59083U, publ.: 12/10/2006, containing sheet piles of pipes with welded to them sheet piles and T-shaped sheet piles placed in the internal cavities of the sheet piles of adjacent piles, characterized in that each mentioned The T-shaped protrusion is made of two corner profiles, welded with some shelves to the pipe, and with the other shelves facing in opposite directions, while a gap is formed between the welded shelves of the corner profiles, the size of which is selected from the condition of ensuring the possibility of bending the welded shelves under the influence of external forces within elastic deformation and is not less than 10% of the height of the welded flange.

Known pile, described in the patent RU 19542U, publ.: 10.09.2001. The pile body has the form of a cylindrical segment with a central angle of not more than 180°, cut from a round pipe along lines parallel to its axis, that is, obtained by a longitudinal section. A female locking element is attached to one of its side edges, and a male locking element is attached to the other.

The manufacture of piles of such a design, in which a male locking element - a rod must be welded to one edge, and a pipe with a longitudinal slot oriented in a strictly defined way - to the other female element is associated with certain technological difficulties. This is due to the fact that for the formation of each of the longitudinal edges of one pile, its own equipment is needed. The presence of "opposite" locking elements on the same pile complicates the automation of the process.

The wall described in this analogue is assembled from identical sheet piles made of pipe segments, while on one side edge of this pile there are male elements, and on the other edge - female elements.

The specialist understands that in order to increase the strength characteristics of the sheet pile wall, it is required to maximize the area of support. This can only be achieved by forming a wavy surface of the wall, that is, by installing piles from cylindrical segments with the crests of adjacent piles facing in opposite directions, when the wall in cross section has a sinus-shaped shape (rather than jagged, unidirectional). In this case, to introduce the male element of one pile into the female element of another (adjacent) pile, each second pile taken from a common stack of identical piles must be turned over not only by orienting the crest, but also unfolded along the length, that is, lowered with a different end. For piles with a length of up to 6 meters or more, this causes significant difficulties during installation, and with limited installation sites, it can be completely excluded. Thus, the problems with the manufacturability of the installation of the pile wall stem from the design of the piles used.

Improving the manufacturability of manufacturing and assembly by unifying the shape of the edges of the piles and dividing them into two types of construction is the solution described in the patent RU 118648U, publ.: 27.07.2012. The solution was chosen for the prototype.

The prototype describes a sheet pile of sinusoidal shape, characterized in that it has a body, which is a segment of a cylindrical metal pipe, obtained by its longitudinal section, identical longitudinal female elements of the locking connection are fixed on the side edges of the body.

However, this pile (as in the prototype) is rarely used in this form for the construction of sheet pile walls without reinforcement.

Pipe segments can be reinforced by any element that plays the role of a reinforcing pile: a tee, a beam, segments of the same pipe or other pipes, a strip, a large circle, etc., by analogy with how described in RU 59083 U.

But reinforcing piles in such ways significantly complicates the process of installing a sheet pile wall, requires high costs for an additional sheet pile, welding and its installation to reinforce the wall.

In addition, there is the so-called “out-of-roundness problem” (change in pile diameter under loads), which occurs due to different loads on different sections of the wall.

The objective of the invention is to eliminate these technical problems.

The technical result is a simplified process of building a sinusoidal sheet piling wall that does not require additional reinforcement, the problem of changing the diameter of piles under loads (the problem of ovality) is eliminated.

The specified technical result is achieved due to the fact that the claimed method of erecting a sinusoidal sheet pile wall, characterized in that the sheet pile wall is mounted from sheet piles, which are a segment of a cylindrical metal pipe, obtained by its longitudinal section, where on the side edges of the body the locking elements are fixed, with which sheet piles are connected, characterized in that linings are welded in the middle part of the sheet piles, each of which is a segment of a cylindrical metal pipe obtained by a longitudinal cut of the same diameter as used in a sheet pile, but having a shorter length than the pile segment.

It is acceptable that when forming a sheet pile, the pile segment is formed at an angle of 90 to 270 degrees.

Preferably, when forming a sheet pile, a segment of the remnant of a cylindrical metal pipe, obtained after its longitudinal cut, is used as an overlay, either in its entirety or by longitudinal cutting into equal parts.

Preferably, the patch is end-welded to the surface of the pile pipe segment.

Brief description of the drawings

Figure 1 shows the principle of connecting the lining to the segment pile.

Figure 2-Figure 4 shows diagrams comparing sheet pile walls according to the claimed method and sheet pile walls according to the prototype.

Figure 5 shows an example of a sinusoidal sheet pile wall with a segment angle of 180 degrees.

Figure 6 shows an example of a sinusoidal sheet pile wall with a segment angle of 270 degrees.

Figure 7 shows an example of a sinusoidal sheet pile wall with a segment angle of 120 degrees.

Figure 8 shows an example of a sinusoidal sheet pile wall with a segment angle of 90 degrees.

In the drawings: 1 - sheet pile segment, 2 - lining segment, 3 - welded joint zone, 4 and 5 - socket and ball interlock elements, respectively.

Implementation of the invention

The method of erecting a sinusoidal sheet piling wall is characterized in that the sheet piling wall is mounted from sheet piles (see Fig.1), which is a segment 1 of a cylindrical metal pipe, obtained by its longitudinal section, where elements of the locking connection 4 and 5 are fixed on the side edges of the body, which connect the sheet piles 1 to each other.

When mounting the wall, the fixed element of the next pile 1 is inserted into the fixing element of the previous one. During installation, each pile is rotated so that the crests of the segments of adjacent piles are oriented in opposite directions and a wall is formed that is symmetrical with respect to the longitudinal plane of symmetry (in section - a sinusoid) - see Fig.5-Fig.8.

What is new is that in the middle part of the sheet piles, pads 2 are welded, each of which is a segment of a cylindrical metal pipe obtained by a longitudinal cut of the same diameter as used in the sheet pile, but having a shorter length than the pile segment 1.

These pads 2 provide a simplified process for the construction of a sinusoidal sheet piling wall that does not require additional reinforcement.

Diagrams comparing sheet pile walls according to the claimed method and sheet pile walls according to the prototype are shown in Fig.2-Fig.4 with different pipe diameters and different loads with the same type of interlocking elements "ball in the socket".

The diagrams show that the use of overlays 2 makes it possible to achieve such strength characteristics that cannot be achieved by sheet pile walls existing at the given period in their working range of diameters and thicknesses of pipes.

From the diagrams of Fig.2-Fig.4 it follows that for any chosen sheet pile wall solution there will always be many solutions with overlays, in which each kg of mass m ^{2 of} the sheet pile wall will give more units of elastic moment than a comparable solution for a wall without overlays (t .e. as in the prototype).

To drive a padded sheet wall, even with a large diameter, a lower driving technique can be used than is required for equal-strength walls without pads, since the padded sheet pile is heavier and easier to drive. Accordingly, this allows a simplified process for the construction of a sinusoidal sheet pile wall.

Transportation of compactly packed segmented sheet pile walls with linings is also fast and requires the same amount of transport as transporting prototype sheet piles, since there is no "air transport" as the linings are placed inside the segments of the main sheet pile.

It is important that to obtain the overlay, a segment of a cylindrical metal pipe of the same diameter obtained by a longitudinal cut is used. Since pipes with diameters of 1420, 1520, 1620, 1820, 2020 mm are used for sheet piles, it is possible to overlap the lining segment on the pipe without large gaps between the segments (to ensure their tight contact with each other) only in relation to pipe segments of the same diameter.

The shorter the lining segment has a length during formation, the lower the bending stress of the pipe wall, which was formed during the manufacture of the pipe at the pipe-rolling shop of the manufacturer, and the less the stress decreases, the smaller the segment is cut.

Thus, when a lining segment of a shorter length than the length of the pile segment is applied to the pile, the lining segment already has a larger diameter than the pile segment itself. And the pile segment itself, accordingly, has a smaller diameter than the diameter of the uncut pipe.

The foregoing provides the condition for tight contact between the lining segments and the pile segment. And this, in turn, eliminates the problem of ovality, which may be present in the sheet piles according to the prototype, since the snug fit of the lining segment to the pile segment excludes a change in the diameter of both under loads.

With the help of segmented sheet pile walls with overlays, it is possible to profitably replace any reinforced sheet pile wall solution with a plurality of solutions according to the claimed method in the following options:

- with greater elastic moments W(cm ³ /m) while maintaining the mass m ² ;

- with a significant decrease in mass m ² while maintaining the elastic moment W (cm ³ /m);

- with a simultaneous decrease in mass m ² and an increase in the elastic moment W (cm ³ /m).

Segment sheet pile walls with overlays successfully solve the problem of replacing many classical sheet piles, not only with significant savings in m ² mass, but at the same time with a significant reduction in the number of immersions.

So, for example, an expensive hot-smoked sheet pile L5UM can be replaced by a variety of unique solutions according to the claimed method with maximum weight savings of up to 45.41% with simultaneous savings of up to 142.2% in the number of immersions. Or replace with a variant with a mass saving of m ² up to 40.68%, but at the same time with a saving in the number of immersions up to 182% (see below the table of substitution of classical sheet piles).

A wide choice of sheet pile wall reinforcement formation is due to the possibility of segment angle selection manipulations both when forming a sheet pile, where the pile segment can be formed with an angle from 90 to 270 degrees, and when forming the size of the lining segment itself.

When forming a sheet pile, a segment of the remnant of a cylindrical metal pipe, obtained after its longitudinal cut, can be used as an overlay either in its entirety or by longitudinal cutting into equal parts. Moreover, the choice of the number of division into equal parts of the segments of the remainder for the formation of overlays is also arbitrary. All this makes it possible to manipulate the dimensions of the wall sheet pile segments and the lining segments completely arbitrarily.

The lining is fixed to the sheet pile segment by welding - by welding the ends of the lining to the surface of the pile pipe segment.

The linings are fixed in the middle part of the sheet piles so that from one edge of the lining to the edge of the pile segment there is the same distance as from the other edge of the lining to the other end of the pile segment. Without such an arrangement, the calculation of the degree of reinforcement of the sheet pile wall will not be possible due to the uneven reinforcement of the walls and the inability to predict the degree of future loads with high accuracy.

For sheet piling segmental walls with overlays, according to the claimed method, the following properties are characteristic.

When using sheet pile walls with overlays:

- section moments (strength parameters) W and J grow faster than mass m ² ,

- moments of inertia grow faster than elastic moments,

- an increase in the elastic moment of the wall can be achieved faster by increasing the diameter of the pipe than by increasing its thickness,

- an increase in the thickness of a segment of sinusoidal sheet pile walls with overlays has a significantly lesser effect on the increase in elastic moments than an increase in pipe diameters.

The use of sinusoidal walls without overlays (as in the prototype) or without reinforcement does not make it possible to replace all types of Russian sheet pile walls.

Replacing the entire nomenclature of sheet pile walls with sinusoidal sheet piles with lining walls at once is possible only with a segment central angle of at least 240° (out of the entire nomenclature, only 1 solution will not be replaced).

The results of the study of the mutual influence of the central angles of the pile segments (α) and lining segments (β) on the results of decisions in the formation of sheet pile walls.

Initial data and explanations based on the results of the study.

The central pipe angle α uniquely defines the segment of the selected sheet pile for a sinusoidal sheet pile wall with cleats.

The central angle β of the same pipe uniquely defines another segment, which characterizes the reinforcement patch.

An overlay with an angle β reinforces the segment with an angle α.

Conclusions about the properties of solutions depending on the angles α and β are obtained on the basis of a study of solutions for a sinusoidal sheet pile wall with overlays (SSHST-N) from a pipe 1420x20 for all angles α and β presented in Table 1.

Table 1

Segment overlays β
α 0 60 90 120 150 180 210 240 270 90 X X X 120 X X X X 150 X X X X X 180 X X X X X X 210 X X X X X X X 240 X X X X X X X X 270 X X X X X X X X X

To study the mutual influence of the angles α and β on the parameters of the solutions of segmental sheet piles, it is convenient to use the generally accepted coefficient of efficiency (utility) Keff, which simultaneously links two main parameters Mkg/m ² and W cm ³ /m.

The coefficient Keff shows how many units of elastic moment are delivered by each kg of mass of 1 m ^{2 of} the wall.

Research results

On the change in the efficiency coefficient with the growth of pile segments and overlay segments.

In all seven studied segments, solutions with zero overlay (β=0) have the lowest coefficient of efficiency relative to solutions in their segments, which confirms the inefficiency of using segmental solutions in sinusoidal sheet pile walls without overlays (SSHST).

In each segment, the efficiency coefficient of solutions continuously grows along with the growth of the overlap angle β, but only up to a certain value. In each segment, the value of this parameter is individual and depends on the angle α:⋅β=α/2. With a further increase in the overlap angle β, the value of the Keff parameter in the segment under study decreases.

The lowest Keff in each segment will be obtained when the overlap angle β becomes equal to the angle α of the segment under study (α=β).

When comparing two segments with angles α ₁ <α ₂ , all solutions from segment α ₂ are always more efficient than all solutions from segment α ₁ with the same overlays, including even the most efficient solutions from segment α ₁ and inefficient solutions from segment α ₂ (for β =0 and β=α) .

On the change in masses and elastic moments with the growth of pile segments and overlay segments.

In each segment, for all solutions with overlays, with an increase in the angle β (for overlays), the elastic moments W (cm ³ /m) and masses m ² (kg/m ² ) only increase.

In each segment, despite the lowest efficiency coefficient, the solution at α=β always has the largest elastic moment W and mass M among the solutions in its segment.

When comparing solutions of two segments with angles α ₁ <α ₂ , all elastic moments and masses of solutions from segment α ₂ are always greater than elastic moments and masses from segment α ₁ with the same overlays, including solutions with angles β=0 and β=α.

The largest increase in the elastic moment (up to 92%) within each segment is observed when comparing the solution without lining (β=0) with the solution with the smallest lining (60°) from the same segment.

This once again emphasizes the low efficiency of solutions without overlays (SSST).

With an increase in the angle of the lining inside the same segment, the masses grow approximately twice as slowly on average as the elastic moment W increases.

On the values and mutual influence of the parameters W, M, k _eff

in segment solutions SSHST-N 1420хt

when changing the parameter t=[10,11..20].

Comparison with SShST 1420хt solutions

table 2

Study of SSHST-N 1420x20 segment solutions for all segments and overlays

Initial data and explanations for the study.

Values of elastic moments of sheet pile walls SShST-N with segments and overlays from pipe 1420хt at maximum efficiency coefficients

Comparison* with sheet pile wall solutions SShST 1420xt are shown in Table 3.

* for comparison, only those SShST-N solutions with 1420xt pipe elements were selected, which had the highest Keff

Table 3

Dxt max K _eff SSWST max K _eff SShST-N Wmax SShST, cm ³ / m Wmax SShST-N, cm ³ / m 1420x20 42.98 84.42 20 514 69 710 1420x19 42.99 84.42 19 529 66 293 1420x18 43.00 84.41 18 541 62 868 1420x17 42.99 84.39 17 548 59 437 1420x16 42.98 84.35 16 551 55 998 1420x15 42.96 84.30 15 549 52 553 1420x14 42.93 84.23 14 543 49 100 1420x13 42.89 84.14 13 533 45 640 1420x12 42.82 84.01 12 519 42 173 1420x11 42.74 83.85 11 500 38 699 1420x10 42.63 83.63 10 477 35 217

Conclusions: provided that the solutions of SSHST-N segmental sheet piles achieve maximum efficiency coefficients, it is possible to achieve such elastic moments with segments and linings from pipes 1420xt, which are 3.4 times greater than the elastic moments of solutions SSHST 1420xt

Values of elastic moments of SShST-N sheet pile walls with segments and overlays from pipe 1420хt.

Comparison* with sheet pile wall solutions SShST 1420xt are shown in Table 4.

* for comparison, only those solutions with 1420xt pipe elements were selected, which had the highest elastic moment, regardless of the value of the efficiency coefficient.

Table 4

Dxt max K _eff SSWST max K _eff SShST-N Wmax SShST, cm ³ / m Wmax SShST-N, cm ³ / m 1420x20 42.98 69 20 514 75 580 1420x19 42.99 69 19 529 71 858 1420x18 43.00 69 18 541 68 130 1420x17 42.99 68.99 17 548 64 397 1420x16 42.98 68.97 16 551 60 657 1420x15 42.96 68.94 15 549 56 912 1420x14 42.93 68.89 14 543 53 161 1420x13 42.89 68.84 13 533 49 403 1420x12 42.82 68.76 12 519 45 640 1420x11 42.74 68.65 11 500 43 733 1420x10 42.63 68.53 10 477 38 095

Conclusions: using SSHST-N segment solutions with 1420xt pipe elements (without the requirements for maximum efficiency of segment solutions), it is possible to achieve such elastic moments that are 3.6 times greater than SSHST solutions with the same 1420 pipe and the same thicknesses t .

Typical results of replacing SShST sheet piles with SShST-N segment solutions.

As an example, one solution SShST 1420x20 is replaced by various variants of segmental sheet pile walls with different segment angles α and overlays with different angles β.

Parameters of the replaced solution SShST 1420x20: М=477.26 kg/m ² ; W=20514 cm ³ /m are shown in Table 5.

Substitutions are made to:

- obtain the maximum possible elastic moment W while maintaining or slightly increasing the mass of the solution SShST 1420,

- to minimize the mass of the sheet pile wall while maintaining or slightly increasing W, which is the solution of SShST 1420x20,

- simultaneously minimize both the mass and increase the elastic moment to replace the SShST1420x20 solution.

Table 5

Replacement solutions SShST-N 1420хt Parameters of substituting solutions SShST-N 1420x20 Substitution results* α β Dхt W cm ³ /m ∆W ΔW% M kg / m ² ΔM ΔM% Option b) 180 90 1420x20 20566 32 +0.16% 381.29 -95.97 -20.11 With a slightly larger elastic moment W
savings on weight m ² 20.11% Option b) 240 60 1420x11 20537 23 +0.11% 279.02 -198.24 -41.54 With a slightly larger elastic moment W
savings on mass m ² 41.54% Option a) 270 120 1420x14 38586 +18072 +88.1% 478.08 +0.82 +0.17 With a slightly larger mass, an increase
elastic moment W by 88.10% Option c) 240 120 1420s?? 27574 +7065 +34.44% 361.11 -116.15 -24.34 Simultaneous weight reduction by 24.34%
with an increase in the elastic moment W by 34.44%

* Substitution data is shown as an example. The segment method allows you to make similar substitutions in hundreds of different ways.

Investigation of the change in the parameters W, M and Keff in solutions SShST-N 1420xt with an increase in the parameter t.

Comparison of SShST-N 1420xt solutions with SShST 1420xt solutions is shown in Table 6 for a 270° pile segment + a 135° overlay segment

Table 6

Dxt K _eff SSWST MAX K _eff SShST-N W WSS W SShST-N ΔW cm ³ /m ΔW% W _SShST-N / MAX W _SShST M kg / m ² SShST M kg/m ² SShST-N ΔM kg/ ^m2 ∆M% M _SShST-N / M _SShST 1420x20 42.98 84.42 20514 69710 49196 240.0 3.398 477.26 825.74 348.48 73.02 1,730 1420x19 42.99 84.42 19529 66293 46764 239.1 3.395 454.26 785.26 331.00 72.87 1.729 1420x18 43.00 84.41 18541 62868 44327 239.1 3.391 431.23 744.79 313.56 72.71 1.727 1420x17 42.99 84.39 17548 59437 41889 238.7 3.387 408.16 704.32 296.16 72.56 1.726 1420x16 42.98 84.35 16551 55998 39447 238.3 3.383 385.06 663.85 278.79 72.40 1.724 1420x15 42.96 84.30 15549 52553 37004 238.0 3.380 361.93 623.39 261.46 72.24 1.722 1420x14 42.93 84.23 14543 49100 34557 237.6 3.376 338.76 582.92 244.16 72.07 1.721 1420x13 42.89 84.14 13533 45640 32107 237.3 3.373 315.56 542.46 226.90 71.90 1.719 1420x12 42.82 84.01 12519 42173 29654 236.9 3.369 292.33 502.00 209.67 71.72 1.717 1420x11 42.74 83.85 11500 38699 27199 236.5 3.365 269.06 461.54 192.48 71.54 1.715 1420x10 42.63 83.63 10477 35217 24740 236.1 3.361 245.76 421.08 175.32 71.34 1.713

Investigation of changes in the maximum parameters W, M and Keff in SShST-N 1420xt solutions with an increase in the parameter t.

Comparison of SShST-N 1420xt solutions with SShST 1420xt solutions is shown in Table 7 for a 270° pile segment + a 210° overlay segment

Table 7

Dxt K _eff SSWST K _eff SShST-N W WSS MAX W SShST-N ΔW cm ³ /m ΔW% MAX W _SShST-N / W _SShST M kg / m ² SShST MAX M kg/m ² SShST-N ΔM kg/ ^m2 ∆M% MAX M _SShST-N / M _SShST 1420x20 42.98 69.00 20514 75580 55066 268.43 3.684 477.26 1095.36 618.1 129.51 2.295 1420x19 42.99 69.00 19529 71858 52329 267.96 3,680 454.26 1041.4 587.14 129.25 2.293 1420x18 43.00 69.00 18541 68130 49589 267.46 3.675 431.23 987.44 556.21 128.98 2.290 1420x17 42.99 68.99 17548 64397 46849 266.98 3.670 408.16 933.49 525.33 128.71 2.287 1420x16 42.98 68.97 16551 60657 44106 266.49 3.665 385.06 789.54 494.48 128.42 2.284 1420x15 42.69 68.94 15549 56912 41363 266.02 3.660 361.93 825.58 463.65 128.10 2.281 1420x14 42.93 68.89 14543 53161 38618 265.54 3.655 338.76 771.64 432.88 127.78 2.278 1420x13 42.89 68.84 13533 49403 35870 265.06 3.651 315.56 717.69 402.13 127.43 2.276 1420x12 42.82 68.76 12519 45640 33121 264.57 3.646 292.33 663.75 371.42 127.06 2.271 1420x11 42.74 68.65 11500 41870 30370 264.09 3.641 269.06 609.81 340.75 126.64 2.266 1420x10 42.63 68.53 10477 38095 27618 263.61 3.636 245.76 555.87 310.11 126.18 2.262

Below are examples of substitution of solutions SCST using the claimed method.

Example 1. Replace SShST solutions with a small pipe 820xt with segment solutions SShST-N 820xt with the same pipe, but with the maximum possible elastic moments

Select segment α=270°, β=120°

Table 8

Solutions SShST 820хt Solutions SShST-N 820хt Increments in % SSST Dxt M _SShST W _WSS M _SShST-N W _SShST-N K _{eff SShST-N} %ΔM %∆W 820x9 228.83 5226 526.39 20466 38.88 130.04 291.6 820x10 245.27 5785 581.65 22710 39.04 137.15 292.6 820x11 267.65 6340 636.91 24947 39.17 137.96 293.5 820x12 289.97 6891 692.19 27179 39.27 138.71 294.4 820x13 312.24 7438 747.47 29405 39.34 139.39 295.3 820x14 334.45 7981 802.75 31625 39.40 140.02 296.2 820x15 356.61 8520 858.05 33840 39.44 140.61 297.2 820x16 378.71 9054 913.35 36048 39.47 141.17 298.1

In comparison with SShST 820x16 solutions with a small pipe, segment solutions with the same small pipe:

- mass m ² increased by 2.3-2.4 times;

- elastic moments increased by 3.3-3.8 times;

- efficiency ratio increased by 1.73 times;

- elastic moments of segment solutions grew faster than masses by 1.65 times;

- the elastic moments of the eight solutions SShST-N 820xt presented above are much higher than the elastic moments of the older solution SShST1420x20.

Example 2. Replace the solutions of the SSHST with a small pipe 820xt with segment solutions with any parameters, but with maximum savings in mass m ² and without loss of the initial elastic moments

Table 9

Solutions SShST 820хt SShST-N solutions SSST Dxt M _SShST W _WSS Dхt α β M _SShST-N W _SShST-N K _{eff SShST-N} % savings by weight m ² Savings on the number of drivings 820x9 228.83 5226 1420x10 180 0 134.72 5758 42.74 41.13 60.2 820x10 245.27 5785 1420x11 180 0 147.05 3625 43.01 40.04 60.1 820x11 267.65 6340 1220x9 180 0 148.50 6599 44.43 44.52 32.3 820x12 289.97 6891 1420x12 180 0 159.38 6891 43.23 45.03 60.8 820x13 312.24 7438 1420x10 180 0 161.39 8483 52.57 48.31 54.0 820x14 334.45 7981 1420x10 180 0 161.39 8483 52.57 51.74 54.0 820x15 356.61 8520 1420x10 180 60 175.80 9192 52.28 50.70 60.2 820x16 378.71 9054 1420x10 180 60 175.80 9192 52.28 53.58 60.2

Result:

- weight savings reach ≈41-54%,

- elastic moments - not lower than the initial ones,

- due to the fact that replacement solutions use pipe segments with larger diameters, there is a saving of up to 60% in terms of the number of plugs per m ² .

Example 3. Replace SShST solutions with an average pipe 1020xt with SSHST-N 1020xt segment solutions with higher elastic moments.

We select the segment α=270°, β=120° and replace the SSST1020xt solutions with SSST-N solutions only from this segment.

Table 10

SShST 1020хt solutions Solutions SShST-N 1020хt Increments in % SSST Dxt M _SShST W _WSS M _SShST-N W _SShST-N K _{eff SShST-N} %ΔM %∆W 1020x9 222.65 6631 281.47 15096 53.63 26.42 127.7 1020x10 245.49 7346 310.67 16748 53.91 26.55 128.0 1020x11 268.29 8057 339.86 18359 54.12 26.68 128.3 1020x12 291.05 8764 369.06 20037 54.29 26.8 128.6 1020x13 313.76 9466 398.27 21674 54.42 26.93 128.9 1020x14 336.42 10164 427.47 23306 54.52 27.06 129.3 1020x15 359.04 10858 456.67 24933 54.60 27.19 129.6 1020x16 381.61 11548 485.88 26555 54.65 27.32 129.9 1020x17 404.14 12233 515.08 28173 54.70 27.45 130.3 1020x18 426.62 12915 544.29 29785 54.72 27.58 130.6 1020x19 449.05 13592 573.5 31393 54.74 27.71 130.9 1020x20 471.44 14265 602.72 32996 54.75 27.85 131.3

An increase in mass (on average) by 27.13% allowed segmented sheet piles with a 1020xt pipe to increase the elastic moment by 131% for each value of the parameter t.

In absolute terms, the elastic moments increased by an average of 2.94 times, and the masses by an average of 1.72 times, i.e. elastic moments grew 2.3 times faster than masses.

Eight solutions SShST-N1020xt (t=13..20) are able to replace older solutions SShST1420x20 with significantly higher elastic moments and efficiency coefficients.

Example 4. Replace SShST solutions with a 1020xt middle pipe with SSHST-N segment solutions with any parameters, but with maximum savings in mass m ² and without loss of initial elastic moments

Table 11

SShST 1020хt solutions SShST-N solutions SSST Dxt M _SShST W _WSS Dхt α β M _SShST-N W _SShST-N K _{eff SShST-N} % savings by weight m ² Savings on the number of drivings 1020x10 245.49 7346 1020x9 240 0 191.58 8127 42.42 21.96 1020x12 291.05 8764 1020x10 180 60 192.07 10554 54.95 34.01 60.2 1020x14 336.42 10164 1420x10 180 60 192.07 10554 54.95 42.91 60.2 1020x16 381.61 11548 1420x10 240 0 204.78 12431 60.71 46.34 37.5 1020x18 426.62 12915 1420x10 210 60 204.92 13080 63.83 51.97 53.5 1020x20 471.44 14265 1420x11 210 60 224.29 14366 64.07 52.44 53.4

Result:

- with an increase in the value of the parameter t, the savings in mass increases from 21.6% to 52.44%,

- elastic moments - higher than those of the original ones, SShST1020хt,

- due to the fact that replacement solutions use pipe segments with large diameters, there is a saving of up to 53.4% in terms of the number of plugs per m ² .

Example 5. In order to obtain the (highest) elastic moments with any pipe, one has to look for SSST-N solutions with this pipe in the (most) highest segments.

For a pipe 1020хt we choose the oldest segment α=270°, β=269°

Table 12

SShST 1020хt solutions Solutions SShST-N 1020хt Increments in % SSST Dxt M _SShST W _WSS M _SShST-N W _SShST-N K _{eff SShST-N} %ΔM %∆W 1020x9 222.65 6631 514.87 25075 48.70 131.25 278.1 1020x10 245.49 7346 569.5 27831 48.87 131.99 278.8 1020x11 268.29 8057 624.14 30581 49.00 132.64 279.5 1020x12 291.05 8764 678.78 33324 49.09 133.22 280.2 1020x13 313.76 9466 733.42 36062 49.17 133.75 280.9 1020x14 336.42 10164 788.08 38794 49.23 134.25 281.6 1020x15 359.04 10858 842.73 41520 49.27 134.72 282.3 1020x16 381.61 11548 897.39 44240 49.30 135.16 283.1 1020x17 404.14 12233 952.06 46954 49.32 135.58 283.8 1020x18 426.62 12915 1006.73 49662 49.33 135.98 284.5 1020x19 449.05 13592 1061.4 52365 49.34 136.37 285.2 1020x20 471.44 14265 1116.08 55062 49.34 136.74 285.9

The masses of the substituting solution SShST-N 1020xt increased in the range of 2.31-2.36 times.

The elastic moments at the same time increased in a significantly higher range of 3.78-3.86 times.

With an increase in the value of the parameter t, the elastic moments grow on average 1.63 times faster than the masses (for each value of the parameter t).

Example 6. Replacing* solutions of sheet piles SShST with a large pipe 1420xt for solutions of segmental sheet piles with the same diameter SShST-N 1420xt with weight savings without lowering the values of elastic moments

* The replaced row of sheet piles already has the highest efficiency factor (k=43) among all SSW solutions.

Table 13

Solutions SShST 1420хt Solutions SShST-N 1420хt SSST Dxt M _SShST W _WSS Dxt M _SShST-N W _SShST-N K _{eff SShST-N} α β %ΔM mass saving m ² 1420x10 245.76 10477 1420x10 192.07 10554 54.95 240 60 21.85 1420x11 269.06 11500 1420x10 204.78 12431 60.71 240 0 22.44 1420x12 292.33 12519 1420x10 226.36 13080 63.83 210 60 29.90 1420x13 315.56 13533 1420x11 223.93 13659 61.00 240 0 29.04 1420x14 338.76 14543 1420x10 226.36 14841 65.56 210 90 33.18 1420x15 361.93 15549 1420x12 243.53 15649 64.26 210 60 32.71 1420x16 385.06 16551 1420x10 254.87 18697 73.36 240 60 33.81 1420x17 408.16 17548 1420x12 269.26 17763 65.97 210 90 34.03 1420x18 431.23 18541 1420x10 279.01 21184 75.92 240 90 35.30 1420x19 454.26 19529 1420x10 279.01 21184 75.92 240 90 38.58 1420x20 477.26 20514 1420x10 279.01 21184 75.92 240 90 41.54

Conclusions: a number of SShST1420xt sheet piles (with the highest efficiency factor among SShST solutions) were replaced by segment solutions with the same diameters with weight savings from 21.85% to 41.5% per m ² without lowering elastic moments.

Example 7. Replace SShST 1420xt solutions with more efficient segment solutions.

Table 14

Solutions SShST 1420хt Solutions SShST-N 2020хt SSST Dxt M _SShST W _WSS Dxt α β M _SShST-N W _SShST-N K _{eff SShST-N} %ΔM mass saving m ² 1420x10 245.76 10477 1420x10 270 90 376.15 31331 83.29 31.53 1420x11 269.06 11500 1420x11 270 150 478.01 39656 82.96 30.31 1420x12 292.33 12519 1420x12 270 150 519.97 43220 83.12 35.86 1420x13 315.56 13533 1420x13 270 150 561.93 46775 83.24 40.58 1420x14 338.76 14543 1420x14 270 150 603.89 50329 83.33 40.24 1420x15 361.93 15549 1420x15 270 150 645.85 53864 83.40 43.29 1420x16 385.06 16551 1420x16 270 150 687.82 57399 83.45 43.55 1420x17 408.16 17548 1420x17 270 150 729.78 60926 83.48 43.73 1420x18 431.23 18541 1420x18 270 150 771.75 64446 83.51 44.70 1420x19 454.26 19529 1420x19 270 60 642.96 52014 80.90 47.51 1420x20 477.26 20514 1420x20 270 60 675.94 54677 80.89 50.07

Increasing the diameters of the segment solutions makes it possible to replace the SShST 1420xt with greater weight savings from 32 to 50% without reducing the elastic moments.

The ranges of the main parameters of the SShST-N solutions in all segments are given in Table 15.

Table 15

No.
segment α kaff M W J one 90 4.67-14.41 94.51-286.5 442-4128 4849-100977 2 120 8:26-24 94.54-386.07 781-9.267 13871-369217 3 150 12.41-34.64 100.4-433.74 1246-15023 31758-855334 four 180 16.72-45.42 112.24-504.54 1877-22914 63112-1721390 5 210 20.77-55.34 132.3-612.38 2748-33888 114366-315736 6 240 24.16-63.46 166.08-786.11 4012-49891 196255-54800 7 270 26:53-69 227.5-1095.36 6035-75580 332117-9371900

Based on the results of all studies, we came to the conclusion that the most effective solutions in the segment α=270°, β=120°

They are characterized by:

conclusions in absolute terms:

- elastic moments in SShST-N 1420хt solutions are on average 3.38 times higher than in SShST1420хt solutions (for each value of t),

- the masses in SShST-N 1420xt solutions are on average 1.73 times greater than in SShST 1420xt (for each value of t),

- elastic moments in SShST-N 1420xt solutions grow 1.96 times faster than the mass m ^{2 of} the sheet pile wall (for each value of t),

- SShST-N 1420хt solutions are 1.98 times more efficient than SShST 1420хt solutions (for all values of t).

Conclusions in percentage terms:

- elastic moments in SShST-N 1420xt solutions are on average 238% higher than in SShST1420xt solutions (for each value of t),

- masses of segment solutions SShST-N 1420xt are on average 72.22% more than in SShST 1420xt (for each value of t),

- SShST-N 1420xt solutions are 96.3% more efficient than SShST 1420xt solutions (for all values of t).

For solutions in the maximum possible segments at α=270°, β=269°.

Conclusions in absolute terms:

- elastic moments in SShST-N 1420xt solutions are on average 3.66 times greater than in SShST1420xt solutions (for each value of t),

- the masses in SShST-N 1420xt solutions are on average 2.26 times greater than in SShST 1420xt (for each value of t),

- elastic moments in SShST-N 1420xt solutions grow 1.6 times faster than the mass m ^{2 of} the sheet pile wall (for each value of t),

- SShST-N 1420xt solutions are 1.6 times more efficient than SShST 1420xt solutions (for all values of t).

Conclusions in percentage terms:

- elastic moments in SShST-N 1420xt solutions are on average 266% times greater than in SShST1420xt solutions (for each value of t),

- masses of segment solutions SShST-N 1420xt are on average 128% more than in SShST 1420xt (for each value of t),

- SShST-N 1420xt solutions are 66.65% more efficient than SShST 1420xt solutions (for all values of t).

The conducted studies show that the claimed method of erecting a sinusoidal sheet pile wall with overlays provides high-quality reinforcement of the sheet pile wall only due to the optimal selection of the angles of the segments for the pile and the overlay without the need for additional reinforcement.

Claims (4)

1. A method for erecting a sinusoidal sheet pile wall, characterized in that the sheet pile wall is assembled from sheet piles, which are a segment of a cylindrical metal pipe obtained by its longitudinal section, where on the side edges of the body, elements of the locking connection are fixed, which connect the sheet piles, characterized in that plates are welded in the middle part of sheet piles, each of which is a segment of a cylindrical metal pipe obtained by a longitudinal cut of the same diameter as used in a sheet pile, but having a shorter length than the pile segment. 2. The method according to claim 1, characterized in that when forming a sheet pile, the pile segment is formed at an angle of 90 to 270 degrees. 3. The method according to claim 1, characterized in that when forming a sheet pile, a segment of the remnant of a cylindrical metal pipe, obtained after its longitudinal section, is used as an overlay either entirely or by a longitudinal section into equal parts. 4. The method according to claim 1, characterized in that the lining is butt welded to the surface of the pile pipe segment.

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