SE1550072A1 - Cylindrical pile and cylindrical pile extension element - Google Patents

Abstract

Abstract Cylindrical pile element (10) with a longitudinal axis (V), for use as a reinforcing or supporting construction element, having a cross-sectional cylinder diameter of at least 70 mm, be- ing arranged to be lengthwise extendable using a cylindrical sleeve element (20), using a male pile element thread comprised in a pin end (11) of the said pile element and arranged to engage with a corresponding female sleeve element thread comprised in the said sleeve element at a respective box end (21) of the sleeve element, which pile element thread is generally tapered. The invention is characterised in that the side flank of the pile element thread facing towards the pin end is inclined between 15° and 25° in relation to a plane perpendicular to the longitudinal axis, and in that the side flank facing away from the pin end is inclined between 60 and 8° in relation to said plane.

Description

15 20 25 30 are attached one to the other, in their longitudinal direction, using a "sleeve", to form a connected, long pile. A ”sleeve” is a cylindrical part comprising two opposite box ends, each arranged to engage with a corresponding pin end of a respective pile element. lt would be desirable to achieve a screw joint pile element which is better than prior art such pile elements in terms of installation quickness and reliability. Specifically, a pile ele- ment is desired that can offer such qualities in dirty environments and using manual instal- lation methods.

The present invention solves this and other problems. ln particular, it solves the problem by proposing a thread of particular configuration in a cone-shape thread joint for such pile- and sleeve elements.

Hence, the invention relates to a cylindrical pile element with a longitudinal axis, which pile element is arranged for use as a reinforcing or supporting construction element, which pile element has a cross-sectional cylinder diameter of at least 70 mm, which pile element is arranged to be lengthwise extendable using a cylindrical sleeve element, using a male pile element thread comprised in a pin end of the said pile element and arranged to engage with a corresponding female sleeve element thread comprised in the said sleeve element at a respective box end of the sleeve element, which pile element thread is generally tapered from a relatively wider part towards a relatively narrower part closer to the said pin end, which pile element is characterised in that the side flank of the pile element thread facing towards the pin end is inclined between 15” and 25° in relation to a plane which is perpen- dicular to the longitudinal axis of the pile element, and in that the side flank of the pile element thread facing away from the pin end is inclined between 6° and 8° in relation to a plane which is perpendicular to the longitudinal axis ofthe pile element.

Furthermore, the invention relates to a cylindrical pile sleeve element with a longitudinal axis, which sleeve element is arranged for use as a reinforcing or supporting construction element, which sleeve element has a cross-sectional cylinder diameter of at least 80 mm, Ansökningstext, 2015-01-23 150004SE 10 15 20 25 30 which sleeve element is arranged for extending lengthwise a cylindrical pile element ac- cording to any one of the preceding claims, using a female sleeve element thread comprised in the sleeve element at a respective box end ofthe sleeve element, and arranged to engage with the male pile element thread of said pile element, which sleeve element thread is gen- erally tapered from a relatively narrower part towards a relatively wider part closer to the said box end, which sleeve element is characterised in that the side flank of the sleeve ele- ment thread facing away from the box end is inclined between 15° and 25° in relation to a plane which is perpendicular to the longitudinal axis of the sleeve element, and in that the side flank of the sleeve element thread facing towards the box end is inclined between 6° and 8° in relation to a plane which is perpendicular to the longitudinal axis of the sleeve element. ln the following, the invention will be described in detail, with reference to three embodi- ments of the invention as shown in the enclosed drawings, wherein Figure la is a cross-section of a pin end of a pile element according to a first exemplifying embodiment of the present invention; Figure lb is a magnification of the detail ”A” of figure la; Figure 2a is a cross-section of a sleeve according to said first embodiment; Figures 2b and 2c are respective magnifications of details ”A” and ”B”, respectively, of figure 2a; Figure 3a is a cross-section of a made-up aggregate comprising a first and a second pile element and a sleeve according to said first embodiment; Figure 3b is a magnification ofthe detail ”A” of figure 3a; Figure 4a is a cross-section of a pin end of a pile element according to a second exemplifying embodiment of the present invention; Figure 4b is a magnification ofthe detail ”A” of figure 4a; Figure 5a is a cross-section of a sleeve according to said second embodiment; Figures 5b and 5c are respective magnifications of details ”A” and ”B”, respectively, of figure 5a; Ansökningstext, 2015-01-23 150004SE 10 15 20 25 30 Figure 6a is a cross-section of a made-up aggregate comprising a first and a second pile element and a sleeve according to said second embodiment; Figures 6b and 6c are respective magnifications of the details ”A” and ”B”, respectively, of figure 6a; Figure 7a is a cross-section ofa pin end of a pile element according to a third exemplifying embodiment of the present invention; Figure 7b is a magnification ofthe detail ”A” of figure 7a; Figure 8a is a cross-section of a sleeve according to said third embodiment; Figure 8b is a magnification of detail ”A” of figure 8a; Figure 9 is a simplified view of a part of a pile element and a part of a sleeve, illustrating the terminology used herein; and Figure 10 is a simplified view of a pile aggregate comprising three pile elements and three sleeve elements according to the invention.

The figures also show measures, given in mm and degrees, as applicable. An ”R” followed b a number indicates the curvature radius of a corner. For instance, ”R0,25” means a cur- V vature radius of an indicated corner of 0.25 mm.

Some figures comprise a ”1” or ”2” inside a circle. This denotes a pile element (”1”) or a sleeve element (”2”), respectively.

Figure 9 illustrates the terminology used herein. A simplified and not-to-scale detail section view of the respective wall of a cylindrical pile element 10 and a cylindrical sleeve element 20 are shown. lt is understood that the sleeve element 20 is arranged to fit snugly and con- centrically around the pile element 10 when engaged in a made-up threaded relationship.

The pile element 10 comprises a pin end 11. As used herein, the term ”pin end” may refer to either the end itself or to the part of the pile 10 near the end itself, depending on the circumstances. The corresponding is true regarding the term ”box end”. The pile element 10 also comprises external threads 12. ”V” denotes a longitudinal direction ofthe pile ele- ment 10 and the sleeve element 20 (the same in figure 10).

Ansökningstext, 2015-01-23 150004SE 10 15 20 25 30 The sleeve element 20 comprises a box end 21, and a second box end 27 (not shown), as well as internal threads 22. ln general, threads 12, 22 comprise side flanks 24, 25 separated by crests 23 and roots 26. ln the following, the present invention will be explained in relation to the three embodi- ments shown in figures la-3b; 4a-6b; and 7a-8b, respectively.

Hence, the present invention relates to a cylindrical pile element with a longitudinal axis, which pile element is arranged for use as a reinforcing or supporting construction element, for instance in the construction of buildings and/or traffic infrastructure. The pile has a cross-sectional cylinder diameter of at least 70 mm. As shown in the figures, the thread of the pile element is conical in the sense that the pile element thread is generally tapered from a relatively wider part, extending along a longer section, such as covering the majority of the pile element length, towards a relatively narrower part closer to the pin end of the pile element. This implies that the thickness of the cylinder wall of the pile element is also tapered towards a thinner part near the pin end. ln the opposite end ofthe pile element, a corresponding narrowing exists. The cylinder di- ameter referred to above pertains to the maximum diameter away from the conical section of the pile.

Moreover, the pile element is arranged to be lengthwise extendable using a cylindrical sleeve element, using a male pile element thread comprised in a pin end of the said pile element, which male thread is arranged to engage with a corresponding female sleeve ele- ment thread comprised in the said sleeve element at a respective box end of the sleeve element. Hence, using sleeves 20a, 20b of the type illustrated, in a simplified fashion, in figure 9, several pile elements 10a, 10b, 10c may be joined together to form a single, con- nected and longer pile 30. This is illustrated in figure 10, in a simplified and not-to-scale manner.

Ansökningstext, 2015-01-23 150004SE 10 15 20 25 30 According to the invention, the side flank of the pile element thread facing towards the pin end of the pile element is inclined between 15° and 25°, preferably about 20°, most prefer- ably 20°, in relation to a plane which is perpendicular to the longitudinal axis (V) of the pile element. When the pile element 10, and the pile 30, is installed vertically, this axis V is thus also vertical. Furthermore, the opposite side flank, that is the side flank of the pile element thread facing away from the pin end of the pile element, is inclined between 6° and 8°, preferably about 6°, most preferably 6°, in relation to a plane which is perpendicular to the longitudinal axis (V) ofthe pile element. This is illustrated in figures lb (110° and 96° angle to longitudinal direction); 4b (110° and 84° angle to longitudinal direction); and 7b, respec- tively.

As stated above, the threads are in general conical, preferably at a general angle of 3-4° to the longitudinal direction V - see figures lb (3°); 4b (3°) and 7a (4°) .The combination of generally conical threads and the type ofangled side flanks discussed above has been found, by the present inventors, to be superior for the specific application of construction piles.

Namely, they offer a very strong joint between pile and sleeve once fastened with appro- priate torque, at the same time as their installation can be made fast and in a highly reliable way. A next pile element can simply be put, tipped or tilted down into the hole of the sleeve, which is mounted on the previous pile element (which is then arranged in a bore hole in the ground), and rotated into threaded engagement with the sleeve, with a low risk of the threads becoming intertangled due to rotational or angular mismatch between pile element and sleeve element. This is the case even when used in uncontrolled, heavily dirty environ- ments, such as at a construction site with presence of moist, dirt, sand, gravel and so forth. ln particular, the above specified flank angles have proven to be advantageous in the case shown in the figures, in which the crest of the pile element thread comprises a flat surface which is substantially parallel to the longitudinal axis V of the pile element along substan- tially the whole length of the male thread. Hence, as seen in the cross-section shown in the figures, the respective flat surfaces of consecutive crests are pa rallel displaced one the next, so that all such surfaces are essentially parallel to the longitudinal direction V of the pile element. This provides a very high chance that a coarsely inserted pile element can engage Ansökningstext, 2015-01-23 150004SE 10 15 20 25 30 directly, in a problem-free way, with its sleeve element, in particular in combination with the above-discussed flank angles. lt is preferred that the pile element thread has a constant pitch, preferably throughout the whole or substantially the whole length of the pile element thread. The corresponding is preferably also true regarding the present sleeve element.

As seen in the figures, inner and outer corners ofthe threaded parts are in general rounded. ln particular, it is preferred that all external and internal corners of the pile element thread are rounded using a respective curvature radius of between 0.1 and 0.5 mm. The corre- sponding is preferably also true regarding the present sleeve element.

Preferably, the pile element, and also correspondingly the sleeve element, is made of steel material as one integrated material body. Preferably, the steel material is a high strength structural steel such as S460 or comparable qualities.

Each pile element is preferably at least about 1 meter long, in a more preferred embodiment and primarily intended for heavy installations at least about 3 meters long, from pin end to pin end. Preferably, the pile element comprises two opposed pin ends, each comprising a respectively substantially identical male pile element thread according to the above.

The present invention further relates to a cylindrical pile sleeve element according to the above and as shown in the figures. Such a sleeve element is, like the pile element, arranged for use as a reinforcing or supporting construction element, and has a cross-sectional cylin- der diameter of at least 80 mm. Furthermore, the sleeve element is arranged for extending lengthwise a cylindrical pile element of the above described type, using a female sleeve element thread comprised in the sleeve element at a respective box end of the sleeve ele- ment, and is arranged to engage with the male pile element thread ofthe said pile element.

The sleeve element thread is generally tapered from a relatively narrower part towards a relatively wider part closer to the said box end.

Ansökningstext, 2015-01-23 150004SE 10 15 20 25 30 As is the case with the pile element, the side flank of the sleeve element thread facing away from the box end is inclined between 15° and 25° in relation to a plane which is perpendic- ular to the longitudinal axis V of the sleeve element, and in that the side flank of the sleeve element thread facing towards the box end is inclined between 6° and 8° in relation to a plane which is perpendicular to the longitudinal axis V of the sleeve element. lt is preferred that the sleeve element thread corresponds or at least substantially corre- sponds to the pile element thread in terms of side flank-, crest- and root angles and dimen- sions. However, it is preferred, as illustrated in figures 3b and 6b, that a certain play of pref- erably less than 1 mm, more preferably less than 0,5 mm, most preferably 0,39 mm, is pre- sent along the V direction at the less angled side flanks during fully made-up engagement between pile element and sleeve element.

According to one preferred embodiment, the sleeve element comprises an additional fe- male thread arranged at an additional box end of the sleeve element, which additional fe- male thread is substantially identical to the said sleeve element thread. Hence, each sleeve element is arranged to interconnect two pile elements, one at each side of the sleeve ele- ment, forming a pile aggregate according to the present invention. ln such a pile aggregate, each respective pile element thread is preferably screwed fully into the corresponding sleeve element thread so that a fully made-up thread engagement is achieved between the pile element and the sleeve element. ln a pile aggregate according to the present invention in which two pile elements are inter- connected by fully made-up thread engagements at opposite respective ends of the sleeve element, the respective sleeve element threads are preferably arranged on the sleeve ele- ment so that the distance between the first and second pile elements is between 3 and 15 mm. This is illustrated in figures 3b (9,5 mm) and 6b (5 mm).

Furthermore, the shape of the sleeve element is preferably such that, in fully made-up en- gagement with the pile element, there is a play of at least 0.3 mm (see figure 6c) between Ansökningstext, 2015-01-23 150004SE 10 15 the inner surface ofthe sleeve element and the outer surface of the pile element along a distance of at least 3 mm from the box end ofthe sleeve element.

Above, preferred embodiments have been described. However, it is apparent to the skilled person that many modifications may be made to the disclosed embodiments without de- parting from the basic idea of the invention.

There are many measures given in the drawings, which are all part of the disclosed exem- plifying embodiments. At the same time, it is realized that these detailed examples merely show three different possible pile- and sleeve element designs falling under the protective scope ofthe enclosed claims.

Hence, the invention is not to be limited to the described embodiments, but may be varied within the scope of the enclosed claims.

Ansökningstext, 2015-01-23 150004SE

Claims (13)

1 P AT ENTK R AV

1. Cylindriskt palelement (10) med en langsgaende axel (V), vilket palelement (10) är anordnat att anvandas som ett forstarkande eller stodjande konstruktionselement, vilket pile- lement (10) har en cylinderdiameter i tvarsnitt av Atminstone 70 mm, vilket pAlelement (10) är anordnat att vara forlangningsbart i langdled med hjalp av ett cylindriskt hylselement (20), med hjalp av en p5lelementganga av hantyp som är innefattad i en pinande (11) has sagda palelement (10) och anordnad att gripa in i en motsvarande hylselementganga av hontyp innefattad i sagda p5lelement (20) vid en boxande (21) hos p5lelementet (20), vilken pAlelementganga är i allmanhet avsmalnande frAn en relativt bredare del mot en relativt smalare del narmare sagda pinande (11),kannetecknat av att den sidoflank has pAlelementgangan som vetter mot pinanden (11) är snedstalld mellan 15° och 25° i forhAllande till ett plan som är vinkelratt mot pAlelementets (10) langsgAende axel (V), av att en sidoflank has p5lelementgangan som vetter bort fr5n pinanden (11) är snedstalld mellan 6° och 8° i forhAllande till ett plan som är vinkelratt mot pAlelementets (10) langsg5- ende axel (V).

2. Cylindriskt pAlelement (10) enligt krav Lkannetecknatav att den sidoflank hos pAlelementgangan som vetter mot pinanden (11) är snedstalld 20° i forh51- lande till ett plan som är vinkelratt mot pAlelementets (10) langsg5ende axel (V) langs med vasentligen hela langden has gangan av hantyp.

3. Cylindriskt p5lelement (10) enligt krav 1 eller 2,kannetecknatav att den sidoflank has pAlelementgangan som vetter bort fr5n pinanden (11) är snedstalld 6° i forhallande till ett plan som är vinkelratt mot palelementets (10) langsgaende axel (V) Wigs med vasentligen hela langden has gangan av hantyp.

4. Cylindriskt pAlelement (10) enligt nAgot av foregAende krav,kannetecknat a v att palelementetgangans gangtopp innefattar en plan yta som är vasentligen parallell med p5lelementets (10) langsg5ende axel Wigs med vasentligen hela langden has gangan av hantyp. 2

5. Cylindriskt p5lelement (10) enligt n8got av foreg5ende krav,kanneteck- 1. at av att pAlelementgangan har konstant gangstigning.

6. Cylindriskt palelement (10) enligt nagot av foregaende krav,kanneteck- nat a v att alla yttre och inre horn hos p5lelementgangan Jr rundade med en respek- tive krokningsradie av mellan 0,1 och 0,5 mm.

7. Cylindriskt palelement (10) enligt nagot av foregaende krav,kanneteck- 1. atav att p5lelementet (10) Jr tillverkat av st51material som en enda integrerad materialkropp.

8. Cylindriskt palelement (10) enligt nagot av foregaende krav,kanneteck- 1. at av att p5lelementet (10) Jr Atminstone 1 meter lAngt.

9. Cylindriskt pAlelement (10) enligt n5got av foreg5ende krav,kanneteck- 1. at av att p5lelementet (10) innefattar en ytterligare ganga av hantyp som Jr anordnad vid en andra, motstAende, pinande hos pAlelementet (10), vilken ytterligare Onga av hantyp Jr vasentligen identisk med sagda pAlelementganga.

10. Cylindriskt p51hylselement (20) med en langsg5ende axel (V), vilket hylselement (20) Jr anordnat att anvandas som ett forstarkande eller stodjande konstruktionselement, vilket hylselement (20) har en cylinderdiameter i tvarsnitt av atminstone 80 mm, vilket hylselement (20) Jr anordnat att langdmassigt forlanga ett cylindriskt p5lelement (10) enligt n5got av foreg5ende krav, med hjalp av en hylselementganga av hontyp som Jr innefattad i hyl- selementet (20) vid en respektive boxande (21) has hylselementet (20) och anordnad att gripa in i p5lelementgangan av hantyp has sagda p5lelement (10), vilket hylselement Jr i allmanhet avsmalnande frAn en relativt smalare del mot en relativt bredare del narmare sagda boxande (21),kannetecknat av att den sidoflank (25) has hylselementgangan som vetter bort fr5n boxanden (21) Jr snedstalld mellan 0 och 25° i forh51- lande till ett plan som Jr vinkelratt mot hylselementets (20) langsgaende axel (V), och av att den sidoflank (24) has hylselementgangan som vetter mot boxanden (21) Jr snedstalld mellan 6° och 8° i forhAllande till ett plan som Jr vinkelratt i forh5llande till hylselementets (20) langsgaende axel (V). 3

11. Cylindriskt p51hylselement (20) enligt krav 10, k a rin et eck na tav att hylselementet (20) innefattar en ytterligare ganga av hontyp, anordnad vid en ytterligare boxande hos hylselementet (20), vilken ytterligare ganga av hontyp är vasentligen identisk med sagda hylselementganga.

12. P5laggregat (30) innefattande ett cylindriskt p5lelement (10) enligt n5got av kraven 19 och ett cylindriskt pAlhylselement (20) enligt n5got av kraven 10 eller 11, varvid pAlementgangan är helt inskruvad i hylselementgangan s5 att ett fullt utbildat gangingrepp uppn5tts mellan p5lelementet (10) och hylselementet (20).

13. P5laggregat (30) innefattande forsta och andra cylindriska p5lelement (10a,10b,10c) enligt krav 9 och cylindriska palhylselement (20a,20b) enligt krav 11, varvid palelementgangan hos det forsta pAlelementet (10a) är helt inskruvad i hylselementgangan sA att ett fullt utbildat gangingrepp uppnAtts mellan det forsta pAlelementet (10a) och hylselementet (20a), varvid det andra paelementets (10b) ytterligare palelementganga är helt inskruvad i den ytterliga hylselementgangan s5 att ett fullt utbildat gangingrepp uppn5tts mellan det andra palelementet (10b) och hylselementet (20a),kannetecknat av att de respektive hylselementgangorna är anordnade p5 hylselementet (20a) s5 att avst5ndet mellan de forsta och andra p5lelementen (10a,10b) är mellan 3 och 15 mm. 1 / 1 2