RU108049U1 - DEVELOPMENT OF A PLAIN WALL WITH A LARGE TORQUE OF RESISTANCE ON THE BASIS OF TONGET PILES FROM WELDED MIRROR-SYMMETRIC COLD-BENT STEEL SHEETS - Google Patents

Abstract

 The tongue-and-groove wall device made on the basis of tongue-and-groove piles having a multifaceted profile, consisting of mirror-symmetric cold-formed sheets (panels) with a maximum bending angle of not more than 90º, characterized in that the same type of mirror-symmetric parts of cold-formed sheets near their ends are connected to each other by a welded joint in such a way that the areas near their ends form the mating parts of a tongue-and-groove lock (joint) of the box type, on the one hand, internal, on the other hand, and the welded joint area with the remaining parts of the sheet pile are made both from the outside of the pile (from the side of the lock), and from the inside of the cavity of the pile formed from the connection of two mirror-symmetric cold-formed sheets (panels).

Description

The utility model relates to hydraulic engineering and can be used in the construction of piers, locks, dams, dock structures, mooring bollards, bridge supports; construction of retaining walls; shore protection, water intake and drainage structures; treatment facilities, collectors, tunnels, underground structures, ring closed and open structures, fences; when arranging pits, slopes, foundations, walls of trenches, screes; landslide events.

Known hot rolled sheet piles, panels of the "multi-lock" type [1] (for example, double box piles, in which most of the cost of hot-rolled sheet piles is concentrated in the lock, and there is an excessive number of locks and, therefore, excess cost), in the internal cavities of which soil is placed ( or concrete armored frame) [2]. They greatly enhance the holding force (maximum moment of section resistance) of a sheet pile wall, but they are also very expensive, since casting and rolling of such integral shapes is an extremely costly and time-consuming process, not to mention the enormous weight per square meter of a sheet pile wall of such a many-sided shape.

It is very difficult to use such piles in the construction of the sheet pile wall - their installation is a very long and laborious process.

Known sheet pile wall based on sheet piles of cold-rolled welded sheet pile ESC [3], the sheet pile of which is usually made from a pre-bent sheet of steel, to which is additionally welded with its narrow part a metal plate forming part of a sheet pile lock. Moreover, the shoulder between the two welds is characterized by the thickness of the plate, which reduces the perceived load. Due to the limited volume inside the cavity of the castle, the manufacture of a weld inside is difficult.

In many countries, a cold-pressed sheet pile (sheet pile) is produced, the production method of which suggests that both the lock and the pile body are bent from one sheet and have a thickness equal to the thickness of the sheet used, taking into account the deformations that arose during bending. In the area of the castle, the bend of the sheet exceeds 180 degrees, which leads to the emergence of a large number of microcracks, and this, in turn, reduces the perceived load, shortens the life of the pile and the area of its application.

In contrast to hot-rolled sheet piles, cold-rolled sheet piles are much cheaper to manufacture and lighter in weight, due to which they can be widely used in construction.

Its main disadvantage is the small thickness of sheet steel due to the development of cracks in a thick sheet of steel during bending by more than 180 degrees and, therefore, the incomparably small (compared to hot-rolled sheet pile) capabilities for load perception and service life.

The technical result of this utility model is the construction of a sheet pile wall based on a cold-formed welded sheet pile with a large moment of resistance with comparable or superior indicators relative to hot-rolled analogs, but much smaller in weight, cheaper and easier to manufacture and install.

The specified technical result is achieved due to the fact that the sheet pile wall device is made on the basis of sheet piles having a multifaceted profile, consisting of mirror-symmetric cold-formed sheets (panels) with a maximum bending angle of not more than 90 degrees, characterized in that the mirror-symmetrical parts of the same type cold-formed sheets near their ends are connected to each other by a welded joint in such a way that the areas near their ends form the mating parts of a tongue-and-groove lock (joint) of the box type - with one hundred Inner ones of the other - outer, wherein the area of the welded joint parts is designed as a sheet pile to pile outer side (lock side) and the inside cavity of the pile formed by connecting two mirror-symmetrical cold-sheets (panels).

The utility model is illustrated by drawings, which depict:

figure 1 - the structural device of the tongue-and-groove wall in the profile and the principle of connecting its nodes, where 1 - mirror-symmetric cold-formed sheets (panels), 2 - the same type of mirror-symmetric parts of cold-formed sheets near the ends, 3 - plane of the connection of mirror-symmetric cold-formed sheets (panels), 4, 5 - mating parts of a tongue-and-groove lock (joint) of the box type, 6 - welded joint zone inside the cavity - 8 formed from the joint of two mirror-symmetric cold-formed sheets, 7 - welded joint zone with the outer side s pile (lock side), 9, 10 - respectively inner and outer parts of the tool joint box type, and co - lock box type.

figure 2 shows examples of the structural assembly of a sheet pile wall from piles of a cold-rolled welded sheet pile.

A utility model can be implemented as follows.

Mirror-symmetric panels of a cold-formed sheet are taken, in which near the ends of the panels there are sections (2) of the profile parallel to each other and planes and combine them symmetrically, superimposing sections (2) to each other and welding in places from the outside (from the side lock) (7), and in the zone (6) on the inner side of the cavity (8), formed from the connection of two mirror-symmetric cold-formed sheets.

The panels (1) welded in this way from a cold-formed sheet at their ends (4, 5) form the inner and outer parts of the lock connection of the box type (9, 10), respectively.

The welding zone (6) inside the cavity (8), inter alia, prevents the joint from breaking in sheet piles at longitudinal loads on the tongue wall, and the welding zone (7) in the joint zone prevents joint breaking at transverse loads (compression) and loads on the part of the lock boxing type (9, 10). Without performing these welded joints, for example, a simple bolted connection of cold-rolled tongues will not allow, firstly, waterproofing, and secondly, the reliability of the connection and its proper metal consumption, since bolt holes will weaken the structure without the use of steel strips, and with steel strips it will increase the weight dramatically, which will increase the weight of the structure without a comparable increase in the perceived load (the strips are close to the neutral axis and their contribution to the elastic moment of section resistance is negligible )

In general, due to the symmetric (compensating moments and redistribution of loads) and the all-closed profile form of the sheet pile and the box type lock, formed respectively by the internal and external parts of the castle (9, 10), which, in turn, due to its symmetry and being neutral the axis of the sheet pile wall (minimum load) is reliable, easy to manufacture, convenient to use, and also thanks to the use of a cold-formed sheet having low weight and cost, it is possible to obtain a sheet pile wall with a moment of resistance Nia close or superior torque for hot rolled sheet piles, but much less by weight, more cheap and simple to install. Simplicity of installation is ensured due to the low weight of sheets of cold-pressed sheet pile, the rigidity of the pile structure, lowered immersion energy, and the reduction of “biting” of the mating parts of the castle due to the elasticity of the walls of the castle. A large moment of resistance is achieved due to the closed profile profile of the sheet pile wall close to cylindrical (the mathematically most optimal form: maximum moment per unit mass of the pile), the internal cavity (8) of which can be filled with soil or to increase strength concreted by the reinforcement cage, which is often done when forming sheet piling walls similar in shape from a sheet pile [1 (p. 36-37)], when the wall consists only of tubes and connections to increase the perceived load. To significantly reduce fluid filtration through a box-type lock, its internal cavity can also be concreted, which, in addition, will reinforce additional stiffeners formed by sheet pile locks. In addition, by changing the distance between the parts of the piles farthest from the clamping axis (3), varying the thickness of the cold-formed sheet panel and the grade of steel used, it is possible to easily scale the mechanical characteristics of piles from welded mirror-symmetric cold-rolled steel sheets. An additional increase in the mechanical characteristics of piles is possible due to welding of steel plates of the required thickness onto the outer parts of the piles farthest from the clamping axis (3).

Information sources:

1. http://www.arcelormittal.com/sheetpiling/uploads/files/AMCRPS_Gen_Cat_RU_2009-2.pdf p. 26

2. http://www.miniape.co.uk/PlasticPiling/TheAdvancedPlasticSheetPiling/MultiLockPlasti cSheetPiling / MultiLockPlasticPilingGalleryl / tabid / 147 / Default.aspx

3. http://www.aed.lv/rus/produkcia/spunt/holodnognutii_svarnoi/

Claims (1)

The tongue-and-groove wall device made on the basis of tongue-and-groove piles having a multifaceted profile, consisting of mirror-symmetric cold-formed sheets (panels) with a maximum bending angle of not more than 90º, characterized in that the same type of mirror-symmetric parts of cold-formed sheets near their ends are connected to each other by a welded joint in such a way that the areas near their ends form the mating parts of a tongue-and-groove lock (joint) of the box type, on the one hand, internal, on the other hand, and the welded joint area with the remaining parts of the sheet pile are made both on the outside of the pile (on the side of the castle) and on the inside of the cavity of the pile formed from the connection of two mirror-symmetric cold-formed sheets (panels).