DE1042346B - Method for producing interlocking connections for steel sheet piles - Google Patents

Description

GERMAN

When producing neck constrictions on rolled lock or groove channels for steel sheet piles So far, the lock strips or thickenings required for claw formation after rolling out were folded over, bent or bent over.

In one such process, the flap of the lock bar, which had been rolled out and rolled out, was thickened bent around a bar in a twisting device arranged in front of the rolling mill.

The production can also take place in such a way that the lock connections are rolled out in the unfolded position and then bent together. When producing neck constrictions on groove channels for Steel sleepers are made in a forging press by moving longitudinal rib sections on a Gradually perpendicular to this, the steel sleeper creates a short, continuously interrupted narrowing of the neck achieved the rolled longitudinal groove to the width of the ram around a caliber mandrel. By Step-by-step squeezing off or transverse jamming of remaining parts of the ribs perpendicular to the Roller pressure with the help of annularly arranged and transversely acting press rams is an intermediate form is formed, which is mounted in a folding device behind the rolling mill by one Caliber mandrel is bent into a hook piece.

It is known that the rolling stock has a strength reduction of about 25% perpendicular to the rolled fiber compared to the strength parallel to the rolled fiber. So if a subsequent, sharp bending, buckling or turning over, e.g. B. the lock bar, takes place parallel to the rolled fiber, then the elongation in the outer skin of the convex boundary surface and perpendicular to the rolled fiber so large that once because of this exaggerated stretch and on the other hand because of the much lower strength Longitudinal cracks occur in the building material perpendicular to the rolled fiber. This will make the lock connections very much weakened and the section modulus of the sheet pile wall very considerably reduced. The watertightness of a sheet pile wall made from such planks is no longer guaranteed either. when a lock connection fails.

While a subsequent, gradual and arcuate bending over long distances, e.g. B. the curved bending of flanges or webs in steel sheet piles after rolling out Profiles does not have any noticeable disadvantages, is the subsequent sharp turning over, kinking or bending over short distances, e.g. B. for lock parts of steel sheet pile ^ very dangerous.

The aMählche uod arched bending z. B. the lock side is for lock connections that have a compact shape for static reasons

of lock connections

for steel sheet piles

Applicant:

Dr.-Ing. Kurt Schroeder, Saarbrücken,
Neffstr. 19th

Dr.-Ing. Kurt Schroeder, Saarbrücken,
has been named as the inventor

have to, not appropriate, as the castle will then be too big. Also the watertightness of a lock leaves a strong mobility in the lock, which always occurs with extensive, i.e. large locks, not to.

The following conditions must be attached to interlock connections for steel sheet piles:

1. great tensile strength (about 1.3 t / cm),

2. great shear strength,

3. great torsional stiffness,

4. Great water resistance.

These conditions can be met by a compact lock connection, which has a low, internal bending moment guaranteed.

As mentioned above, the locking bar is often rolled out in a closed caliber. To the Calibration requires a deep, narrow incision in a roller. This incision weakens them The roller is strong and often causes roller breakage. Since the lock bar, as usual, a has slim Ouerstihnittsgestaltung - about the subsequent To facilitate twisting · -, it is difficult to remove the glowing rolling stock during the rolling process to be brought into this narrow calibration. The rolling stock also cools at this point as a result of the slim cross-section of the lock bar quickly. The premature cooling brings it back with it, that the subsequent sharp buckling of the lock bar the formation of cracks in the longitudinal direction of the Bohle promotes.

In the case of a U-shaped sheet pile, which has a wedge-shaped interlocking strip, a subsequent, easier turning for the purpose of forming the lock pawl, the root cross-section of the lock strip is particularly weakened. Turning the lock bar has a concentrated effect only at this point. The building material

80S 661/177

is heavily overstressed on the convex outside of the lock bar, and it can be due to the unusual Elongation the mentioned longitudinal cracks arise. The subsequent buckling of the lock bar just at this point it has another disadvantage. The outer edge of the lock strip is strongly rounded off. As a result, when assembling the sheet pile wall, a wide gap is created, because the rounded outer edge of the foot does not come into full contact with the neighboring plank. A weld together double and triple piles is very difficult because of this disadvantage.

A compact lock connection can only be produced economically by means of an upsetting process, that excludes any crack formation in the longitudinal direction of the lock connection. It is known to Produce sheet metal edges thickening for lock connections by upsetting. Using this The above-mentioned disadvantages are produced on interlocking connections on sheet pile piles in the production of the known lock connection forms by the stowing method according to the invention avoided.

The calibration of the lock bars or the flanges takes place in two rollers. Cutting into the Calibration in just one roller does not take place. For this reason there can be no roll breakage take place. The building material or the rolling stock can be conveniently moved to the required places during rolling be kneaded into it. The rolled-out lock strips are now as strong or as thick as you want and accordingly relatively short. Premature cooling cannot therefore occur. The previous Lock bars are generally narrow and long.

After the entire sheet pile has been rolled out, only the upsetting process described below takes place generally by local roller pressure in a further pass of the rolled Sheet pile.

When upsetting to produce the neck constrictions on U-shaped rolled lock or groove channels with roughly parallel legs, the building material is moved by the acting compressive forces in the direction of the Root of the legs or the lock bar pushed. Thereby the undercutting thickenings formed on the free heads of the lock strips and the legs as a result of shortening the same without Stretching occurs. For this reason, no longitudinal cracks can occur.

The building material itself is compressed and tempered by the compression, and the strength of the lock connection is increased significantly.

During the upsetting, the free L- or T-shaped cross-section of the lock or groove channel becomes guaranteed by internal supports.

Another possibility of production is that the upsetting through the leg ends Pressing or hammering takes place in the longitudinal direction of the workpiece.

The workpiece can also be moved lengthways using fixed presses or hammers.

The device for performing the method on U-, Z-, I- or T-shaped steel sheet piles consists in that for internal support a sliding in the lock or groove channel, articulated in front of the upsetting point Tongue is provided.

In order to be able to use the method with I-shaped steel sheet piles at the flange ends cantilever rollers mounted on one side for internal support, which support each other, are arranged.

Appropriately, the required presses or hammers are used to hike over the workpiece or the tongue or the cantilever rollers are mounted on a chassis movable along the sheet pile.

The thickenings formed by upsetting extend continuously over the entire length of the Sheet pile and achieve a firm and secure cohesion when assembled into a sheet pile wall from plank to plank.

From Fig. 1 it can be seen how, in an I-shaped steel sheet pile, the undercut, L-shaped thickenings η are formed from the flange or leg ends / by compressive forces acting in the direction of the legs. The internal support of the flanges / and the thickenings η is made possible by cantilever rollers e mounted on one side (Fig. 3). These cantilever rollers e grip behind the undercut parts of the flanges f or the thickenings η, ensure the internal shape of the same and support one another.

The outer surface w of the sheet pile wall formed from these I-shaped sheet piles is completely smooth. Adjacent ships cannot get stuck (Fig. 2). In the previous I-shaped sheet piles, the interlocking connections jump in front of the sheet pile alignment and can easily cause damage as a result. FIG. 2 also shows the undercut thickenings η on a T-shaped lock chamber produced by upsetting forces acting in the direction of the lock bar s.

Fig. 5 shows the production of the lock connection for a U-shaped steel sheet pile. From the lock bar s are acting in the direction of the same upsetting forces z. B. the undercut thickenings η formed by local roller pressure. This gives the lock strip s a T-shaped cross section. The tongues, which are arranged for internal support, prevent the building material from penetrating the lock claw during compression (Fig. 4).

Fig. 6 also illustrates the lock claw of a U-shaped steel sheet pile. From the hinge bar is z s. B. by local roller pressure, which acts in the direction of the sole plate s , the undershot, L-shaped thickening η produced. A tongue ζ guarantees the inside support of the free cross-section of the lock claw. The root cross section q of the lock bar s is arbitrarily strong. The outer foot edge a of the lock strip s is rolled out at a sharp right angle when using the upsetting process (Fig. 6). When ramming a sheet pile wall, it lies snugly against the neighboring pile and also allows safe welding.

In its free sliding end, the tongue 2 consists of refractory tungsten steel. The tip of the tongue is exchangeable.

Fig. 7 shows an upset key connection for a Z or U-shaped sheet pile. Instead of the local roller pressure acting perpendicular to the rolling stock, presses or quick-hitting hammers can also be used to compress in the direction of the lock bar. Fig. 8 illustrates an upset socket joint for an I-shaped sheet pile. The main feature of the invention is that after the steel sheet pile has been rolled out, the local compression process begins. The generally rolled out with parallel, lateral boundary surfaces of flanges or legs f or lock afford s point after performing the compression η thickenings which are undercut, without any cams

then, as was customary up to now, have to be bent, folded or bent over to their disadvantage. The flanges / or lock strips s are thus significantly changed at the free head ends by the stowage opening in their cross-section design, they are shortened in length, greatly thickened in width and undercut inwards.

So far, the cross-sectional design of the lock bar in the formation of the lock claw was not changed, d. That is, the lateral boundary surfaces of the lock bar remained after folding over, bending over or bending the same parallel or the lock bar had the same design as before. the The length and width of the lock bar, seen in cross section, were previously the same after being turned.

For better engagement of the rollers, it may be useful, but not part of the invention, to bend the interlocking strip J in a known manner during the rolling of the sheet pile. Before the upsetting, the lock bar s is straightened. When rolling, a known widening can also be rolled at the free end of the lock bar s. This widening offers after straightening the stem lock bar a better possibility of starting the compression (Fig. 6). As a result of the widening, the heat in the head of the lock bar is retained even longer. In this way, the lock bar remains particularly soft and kneadable and can be easily compressed.

All lock connections have stop surfaces perpendicular to the main pulling direction. As a result Their compact design allows them to absorb much greater tensile forces. That all edges the lock connections have to be rounded off slightly, is a matter of course in terms of rolling technology.

Claims (6)

Patent claims: Method for producing the neck constrictions on U-shaped rolled lock or groove channels with approximately parallel legs for steel sheet piles, in which the leg ends or the heads of the lock strips with L or T-shaped, the neck narrowing of the lock channel or groove channel forming, undercutting thickenings are provided, characterized in that the thickenings (η) are produced by upsetting with the aid of compressive forces acting in the direction of the legs by shortening the ends of the limbs or lock strips. 2. The method according to claim 1, characterized in that the free, L- or T-shaped cross section the lock or groove channel during the upsetting guaranteed by internal supports will. 3. The method according to claim 1 or 2, characterized in that the upsetting by the Pressing or hammering takes place over the leg ends in the longitudinal direction of the workpiece. 4. Device for practicing the method according to claims 2 and 3 on U-, Z-, I- or T-shaped steel sheet piles, characterized in that a tongue (z) which slides in the lock or groove channel and is articulated in front of the upsetting point for internal support is provided. 5. Apparatus for practicing the method according to claims 2 and 3 at the flange ends of I-shaped steel sheet piles, characterized in that cantilever rollers (e) which are supported on one side and which are mutually supported, are provided for internal support. 6. Device for practicing the method according to claim 3 or device according to claims 4 and 5, characterized in that the presses or hammer and the tongue (z) or the cantilever rollers (e) are mounted on a chassis movable along the sheet pile. Considered publications: German patent specifications No. 847134, 721478, 520, 687 511, 687 460, 639 493, 589 375, 561 367, 754, 431 639, 124 896, 124 895, 110 169, 108 979; French Patent Nos. 825 500, 364 571; British Patent Nos. 481979, 349 805, 485, 270 288; U.S. Patent No. 1943,933; "Stahl und Eisen", Vol. 69 (1949), No. 12 of June 9, p. 413. 1 sheet of drawings © 809,661 / 177 10.58.