EP3913143B1

EP3913143B1 - Drive point and arrangement

Info

Publication number: EP3913143B1
Application number: EP20175147.6A
Authority: EP
Inventors: Anssi Hyvärinen; Antti PERÄLÄ; Teemu YLI-KOVERO
Original assignee: Rautaruukki Oyj
Current assignee: Rautaruukki Oyj
Priority date: 2020-05-18
Filing date: 2020-05-18
Publication date: 2023-03-15
Anticipated expiration: 2040-05-18
Also published as: EP3913143A1; DK3913143T3; FI3913143T3; PL3913143T3

Description

BACKGROUND

The invention relates to a drive point for a tubular driven pile, such as generally known from document CA 2 934 103 A1 .
The invention further relates to an arrangement comprising a drive point.
Tubular driven pile having a pile core, through which concrete can be introduced into the driven pile are used in the construction industry for making pile foundations. A drive point can be fitted to the first driven pile, to the distal end thereof. The outside diameter of the drive point is typically greater than the outside diameter of the driven pile. In that way an annular space may be produced during the driving-in operation, and that space can be filled with the injection material or concrete by a pressure grouting operation.
A problem with known drive points is that they may slip away from the distal end of the pile, or at least turn away from the ideal position in said distal end. This may cause uneven injection of the injection material or concrete around the driven pile and thus corrosion protection of the driven pile may be weak and the bearing capacity not as planned.

BRIEF DESCRIPTION

Viewed from a first aspect, there can be provided a drive point for a tubular driven pile, the drive point comprising a series of ribs, wherein the series of ribs comprises

outer ribs extending from an outer circumference of the drive point towards a centre axis of said drive point, wherein the outer rib is provided with an inner face faced towards said centre axis of the drive point, and wherein said inner face is arranged to slant in respect to the centre axis of the drive point, and
inner ribs extending from direction of the centre axis towards the outer circumference of the drive point, wherein the inner rib is provided with an outer face faced towards outer circumference of the drive point, and wherein said outer face is arranged to slant in respect to the centre axis (C) of the drive point, wherein a gap is arranged for receiving a distal end of the tubular driven pile, the gap being construed between said two series of ribs, the gap being defined by said inner faces and said outer faces, and width between the outer and the inner faces decreasing from an upper end of the gap to a lower end of said gap.

Thereby a drive point that stays in an ideal position in a distal end of a driven pile may be achieved.
Viewed from a further aspect, there can be provided an arrangement comprising the drive point mentioned above, and a tubular driven pile, wherein the distal end of the tubular driven pile is arranged on the slant surface, and wherein the series of ribs is dimensioned such that said distal end is attached by wedging on the slant surface.
Thereby an arrangement assuring correct installation and structure of a pile foundation may be achieved.
In one embodiment, the arrangement comprises the outer ribs, and the outer rib is connected to a shell of the drive point at its entire height. An advantage is that a strong structure of the outer rib may be achieved.
In one embodiment, the arrangement comprises the inner ribs, and the inner rib comprises an inner surface arranged at a distance from the centre axis of the drive point. An advantage is that elasticity of the inner rib may be enhanced, and thus attachment to the pile improved.
In one embodiment, the arrangement comprises the inner ribs, and at least two of the inner ribs are arranged to unite in the centre axis of the drive point. An advantage is that a strong structure of the inner rib may be achieved.
In one embodiment, all the inner ribs are arranged to unite in the centre axis of the drive point. An advantage is that an even stronger structure of the inner ribs may be achieved.
According to the invention, the arrangement comprises both the outer ribs and the inner ribs, and wherein a gap is arranged for receiving a distal end of the tubular driven pile, the gap being construed between said two series of ribs, the gap being defined by said inner faces and said outer faces, and width between the outer and the inner faces decreasing from an upper end of the gap to a lower end of said gap. An advantage is that a drive point that stays in an ideal position in a distal end of a driven pile may be achieved.
In one embodiment, the outer ribs are arranged to be aligned with the inner ribs. An advantage is that stresses caused against the pile may be further balanced.
In one embodiment, the outer ribs are arranged an alternate way with the inner ribs. An advantage is that the elasticity of the pile may be used for enhancing attachment of the pile to the drive point.
In one embodiment, the outer face arranged in the inner rib is arranged to slant in respect to the centre axis of the drive point. An advantage is that stresses directed towards the outer face of the drive point may be created in the distal end of pile.
In one embodiment, the inner face arranged in the outer rib is arranged to slant in respect to the centre axis of the drive point. An advantage is that stresses directed towards the centre axis of the drive point may be created in the distal end of pile.
In one embodiment, both sides of the gap are arranged to slant in respect to the centre axis of the drive point. An advantage is that stresses against the distal end of pile may be created effectively.
In one embodiment, an angle A of slant is selected in range of 0,1° - 60°, preferably 2° - 20°. An advantage is that stresses against the distal end of pile may be created effectively.
In one embodiment, the angle A is constant at least essentially all the length of the gap 4. An advantage is that stresses against the distal end of pile increase in a constant way in the course the distal end is moving in the gap.
In one embodiment, the distal end is arranged in the gap such that there is a passage between the distal end of the tubular driven pile and the lower end of the gap connecting the inside of said pile to outside thereof. An advantage is that concrete or concrete mortar which is introduced inside the pile to pass the distal end of the pile and spread outside the driven pile.

BRIEF DESCRIPTION OF FIGURES

Some embodiments illustrating the present disclosure are described in more detail in the attached drawings, in which

Figure 1 is a schematic perspective view of a drive point,
Figure 2 is a schematic side view of a drive point and an arrangement,
Figure 3 is a schematic perspective view of another drive point,
Figure 4 is a schematic side view of a detail of the drive point shown in Figure 2, and
Figure 5 is a schematic perspective view of an illustrative example of a drive point.

In the figures, some embodiments are shown simplified for the sake of clarity. Similar parts are marked with the same reference numbers in the figures.

DETAILED DESCRIPTION

Figure 1 is a schematic perspective view of a drive point, and Figure 2 is a schematic side view of a drive point and an arrangement.
The drive point 100 comprises two series of ribs, namely a series of outer ribs and a series of inner ribs. The series of outer ribs comprises outer ribs 2 that extend from an outer circumference 14 of the drive point towards a centre axis C of the drive point. On the other hand, the series of inner ribs comprises inner ribs 3 that extend from direction of the centre axis C towards the outer circumference 14 of the drive point.
In one embodiment, such as shown in Figures, a space 8 between two neighbouring outer ribs 2, and also a space between two neighbouring inner ribs 3, is larger than thicknesses of said ribs. The thickness of the rib 2, 3 may be constant, or decreasing towards the centre C of the drive point, or increasing towards the centre C of the drive point.
The outer rib 2 is provided with an inner face 5 that is faced towards the centre axis C of the drive point, whereas the inner rib 3 is provided with an outer face 6 faced towards outer circumference 14 of the drive point.
A gap 4 is construed between said the series of ribs for receiving a distal end 10 of the tubular driven pile 1, as shown in Figure 2. The gap 4 is defined by the inner faces 5 of the outer ribs and the outer faces 6 of the inner ribs 3. The profile of the gap 4 is selected such that its width W between the outer and the inner faces 5, 6 decreases from an upper end 11 of the gap to a lower end 12 of said gap 4.
The drive point 100 may be manufactured from a metal material, such as steel. Manufacturing method may be e.g. casting, machining, welding, or combination thereof.
The drive point 100 is dimensioned according to the dimensions of the pile 1. The diameter of the drive point 100 is larger than that of the pile. In one embodiment, the diameter of the drive point 100 is 50 mm - 150 mm larger than the diameter of the pile. In an embodiment, the diameter of the drive point 100 is 100 mm larger than the diameter of the pile.
The diameter of the pile 1 is typically in the order of magnitude of 75 mm - 500 mm, but may also range up to, for example, 2 m or 3 m. The wall thickness of the pile is typically in the range of 5 mm - 15 mm, but may, for example, range up to 25 mm.
Figure 4 is a schematic side view of a detail of the drive point shown in Figure 2 . In one embodiment, the width W at the upper end 11 of the gap is in range of 1 mm - 100 mm, such as 3 mm - 30 mm, preferably 5 mm - 18 mm.
In one embodiment, the height of the gap 4 in range of 10 mm - 1000 mm, such as 20 mm - 300 mm, preferably 30 mm - 100 mm.
In one embodiment, such as shown in Figure 4, the outer and the inner ribs have at least substantially equal height. In another embodiment, the outer ribs have different height (lower or higher) compared to the inner ribs.
In one embodiment, such as shown in Figures 1 and 2, the outer rib 2 is connected to a shell 7 of the drive point at its entire height, or at least the height thereof between the upper end 11 to the lower end 12 of the gap.
In one embodiment, at least two of the inner ribs 3 are arranged to unite in the centre axis C of the drive point. In the embodiment shown in Figures 1 and 2, all the inner ribs 3 are arranged to unite in the centre axis C of the drive point.
In one embodiment, number of the outer ribs 2 is same as the number of the inner ribs 3. In Figure 1, the number of the outer ribs (as well as of the inner ribs) is six, and in Figure 3 said number is nine. It is to be noted that the number may selected in range of two to ten, or even more than ten. However, the stability of the attachment may be improved if there are at least three ribs in at least one of the outer and inner series of ribs.
In one embodiment, the width of the rib at the upper end 11 is in range of 5 mm - 30 mm.
In another embodiment, there are more outer ribs 2 than inner ribs 3. In still another embodiment, there are fewer outer ribs 2 than inner ribs 3.
In one embodiment, such as shown in Figures, the outer ribs 2 are arranged to be aligned with the inner ribs 3. In another embodiment (not shown), the outer ribs 2 are arranged an alternate way with the inner ribs 3.
As discussed above, the width W of the gap 4 decreases from the upper end 11 of the gap to the lower end 12 of said gap 4. In an embodiment, this decreasing of the width is realized by arranging the outer face 6 of the inner rib 3 to slant in respect to the centre axis C of the drive point. In this embodiment, the inner face 5 of the outer rib may be parallel or slant in respect to the centre axis C.
In one embodiment, the inner face 5 of the outer rib 2 is arranged to slant in respect to the centre axis C of the drive point. In this embodiment, the outer face 6 of the inner rib may be parallel or slant in respect to the centre axis C.
In one embodiment, both sides of the gap 4 are arranged to slant in respect to the centre axis C of the drive point. In one embodiment, the angle A is equal on both sides of the gap 4. In another embodiment, the angle A of the inner face 5 differs from the angle A of the outer face 6.
In one embodiment, the slant mentioned above means an angle A (shown in Figure 4) of the face 5, 6 in respect to the centre axis C that is selected in range of 0,1° - 60°, preferably 2° - 20°.
In one embodiment, such as shown in Figure 4, there is a bevelled section at the upper end 11 of the slant for easing introducing the pile in the drive point.
In one embodiment, the angle A is constant at least essentially all the height (in direction of the centre axis C) of the gap 4. In another embodiment, the angle A may vary in the gap 4.
According to an aspect, the drive point 100 is a part of an arrangement that further comprises a tubular driven pile 1. An embodiment of the arrangement is shown in Figure 2. The distal end 10 of the tubular driven pile is arranged in the gap 4. The gap 4 is dimensioned such that the distal end 10 of the pile is attached by wedging in the gap 4.
In one embodiment of the arrangement, the distal end 10 is attached in the gap 4 such that there is a passage 13, in at least one gap, between the distal end 10 of the tubular driven pile and an inner bottom 16 of the drive point. Thus, there is a route or passage under the distal end 10 of pile that connects the inside of the pile 1 to outside thereof.
Figure 3 is a schematic perspective view of another drive point. In an embodiment of the drive point, the inner rib 3 comprises an inner surface 9 arranged at a distance from the centre axis C of the drive point. Thus, there is an empty room 15 in the centre of the drive point 100.
Figure 5 is a schematic perspective view of an illustrative example of a drive point. The drive point 100 comprises just the series of inner ribs 3 only, but not the series of the outer ribs 2. This kind of drive point 100 may have a light and simple structure. An example of this embodiment is shown in Figure 5.
In another illustrative example, the drive point 100 comprises just the series of outer ribs 2 only, but not the series of the inner ribs 3. This may provide a light and simple structure, too.

REFERENCE SYMBOLS

1: driven pile
2: outer rib
3: inner rib
4: gap
5: inner face
6: outer face
7: shell
8: space
9: inner surface
10: distal end of pile
11: upper end
12: lower end
13: passage
14: outer circumference
15: room
16: inner bottom

100: drive point

A: angle
C: centre axis of drive point
W: width

Claims

A drive point (100) for a tubular driven pile (1), the drive point (100) comprising
- a series of ribs, wherein

- the series of ribs comprises
-- outer ribs (2) extending from an outer circumference (14) of the drive point towards a centre axis (C) of said drive point, wherein the outer rib (2) is provided with an inner face (5) faced towards said centre axis (C) of the drive point, and wherein said inner face (5) is arranged to slant in respect to the centre axis (C) of the drive point, characterized in that the series of ribs further comprises

-- inner ribs (3) extending from direction of the centre axis (C) towards the outer circumference (14) of the drive point, wherein the inner rib (3) is provided with an outer face (6) faced towards outer circumference of the drive point, and wherein said outer face (6) is arranged to slant in respect to the centre axis (C) of the drive point, wherein

- a gap (4) is arranged for receiving a distal end (10) of the tubular driven pile (1),

- the gap (4) being construed between said two series of ribs, the gap (4) being defined by said inner faces (5) and said outer faces (6), and

- width (W) between the outer and the inner faces (5, 6) decreasing from an upper end (11) of the gap to a lower end (12) of said gap.
The drive point as claimed in claim 1, wherein
the outer rib (2) is connected to a shell (7) of the drive point at its entire height.
The drive point as claimed in any of the preceding claims, wherein the inner rib (3) comprises an inner surface (9) arranged at a distance from the centre axis (C) of the drive point.
The drive point as claimed in any of claims 1 - 2, wherein at least two of the inner ribs (3) are arranged to unite in the centre axis (C) of the drive point.
The drive point as claimed in claim 4, wherein all the inner ribs (3) are arranged to unite in the centre axis (C) of the drive point.
The drive point as claimed in any of the preceding claims, wherein the outer ribs (2) are arranged to be aligned with the inner ribs (3).
The drive point as claimed in any of the preceding claims, wherein the outer face (6) arranged in the inner rib (3) is arranged to slant in respect to the centre axis (C) of the drive point.
The drive point as claimed in any of the preceding claims, wherein the inner face (5) arranged in the outer rib (2) is arranged to slant in respect to the centre axis (C) of the drive point.
The drive point as claimed in any of the preceding claims, wherein both sides of the gap (4) are arranged to slant in respect to the centre axis (C) of the drive point.
The drive point as claimed in any of the preceding claims, wherein the angle (A) of slant is selected in range of 0,1° - 60°, preferably 2° - 20°.
The drive point as claimed in claim 10, wherein the angle (A) is constant at least essentially all the length of the gap (4).
An arrangement comprising the drive point (100) according to any of the preceding claims, and
- a tubular driven pile (1), wherein

- the distal end (10) of the tubular driven pile is arranged on the slant surface, and wherein

- the series of ribs () is dimensioned such that

- said distal end (10) is attached by wedging on the slant surface.
The arrangement as claimed in claim 12, wherein the distal end (10) is arranged on the slant surface (5, 6) such that there is a passage (13) between the distal end (10) of the tubular driven pile and an inner bottom 16 of the drive point connecting the inside of said pile (1) to outside thereof.