NL2009100C2

NL2009100C2 - Ground anchor assembly.

Info

Publication number: NL2009100C2
Application number: NL2009100A
Authority: NL
Inventors: Johannes Franciscus Karsten
Original assignee: J F Karsten Beheer B V
Priority date: 2012-07-02
Filing date: 2012-07-02
Publication date: 2014-01-06
Also published as: WO2014007618A2; WO2014007618A3

Abstract

The invention relates to a method for applying a pivoting ground anchor on considerable depth, the anchor comprising; - a first coupling member for temporary coupling the anchor with a driving rod to drive the anchor to the considerable depth; and, - a tension member for coupling the anchor to the object to be anchored, - a second coupling member which fixedly couples the anchor to the tension member, wherein the tension member is of one piece and has a considerable length for applying the pivoting ground anchor on considerable depth, and wherein the method comprises the step; continuously supplying the tension member to the ground anchor without interruption during driving the ground anchor to the considerable depth.

Description

Ground Anchor assembly Background 5 The present invention relates to an assembly of a pivoting ground anchor and a tension member.

US 2008/0282625 A1 discloses in general a pivoting ground anchor, also referred to as earth anchor.

10 Summary of the invention

The invention aims to provide an improved ground anchor assembly which is less prone to corrosion.

To this purpose the invention provides an assembly of a pivoting ground anchor 15 and a tension member, the anchor comprising; - a first coupling member for temporary coupling the anchor with a driving rod to drive the anchor to the considerable depth; and, - a second coupling member which fixedly couples the anchor to the tension member such that the anchor pivots when the tension member is taken in, 20 wherein the tension member is suitable for coupling the anchor to the object to be anchored, and comprises fibre reinforced material.

Tension members per se made of fibre reinforces plastic are well known and marketed by for example “Pultron Composites” or “FiReP”. These tension members 25 are often referred to as “FRP bars” or “GRP bars”. Another example of a tension member comprising a fibre reinforced plastic can be a basalt fibre composite reinforcing bar or rod. For example, RockBar as marketed by MagmaTech, UK.

This type of tension member can be coupled with the ground with a grout system or something similar that hardens or sets. This grout system based coupling of the 30 tension member with the ground essentially differs with that of a ground anchor which requires a pretensioning phase to build up a cone of ground above the ground anchor.

2

The tension member is in particular made of fibre reinforced material, more particular fibre reinforced plastic.

In an embodiment, the tension member is a hollow or solid bar.

5

In an embodiment of the assembly according to the invention, the tension member is coupled with the second coupling member by a treaded connection. The FRP or basalt fiber reinforcing composite bar is provided with an outside thread for engaging the hardened grout, which couples with a female thread provided in the 10 second coupling member which female thread is configured to mate with the outside thread of the FRP or basalt fiber reinforcing composite bar.

In an embodiment of the assembly according to the invention, the threaded connection is configured such that the coupled tension member has a play of about 1 15 mm to several millimeters along the thread axis. This provides an equal load and/or load distribution on all the windings of the threaded connection.

In an embodiment of the assembly, the second coupling member comprises a second coupling member body having a body recess provided with a female thread 20 wherein a threaded end of the tension member is accommodated with a loose fit. The diameter D of the body recess may exceed 15 mm.

In an embodiment of the assembly, wherein the second coupling member body overlaps with the tension member along its longitudinal axis at least with an overlap Lo 25 of at least 50 mm.

In an embodiment of the assembly, the ratio of the overlap Lo and the diameter D of the body recess exceeds 1, preferably 1,5.

30 The invention further relates to the use of a tension member, made of fibre reinforced plastic, in a pivoting ground anchor assembly.

3

The invention further relates to a device comprising one or more of the characterising features described in the description and/or shown in the attached drawings.

5 The invention further relates to a method comprising one or more of the characterising features described in the description and/or shown in the attached drawings.

The various aspects discussed in this patent can be combined in order to provide 10 additional advantageous advantages.

Description of the drawings

The invention will be further elucidated referring to an preferred embodiment 15 shown in the drawing wherein shown in:

Fig. 1 in side view an assembly according to the invention; and Fig 2 a detail view of fig. 1.

Detailed description of embodiments 20

The invention will be further described in detail referring to an preferred embodiment shown in the figures 1 - 2. In the figure 1 an assembly 15 of a tension member 3 and an anchor 1 is shown. The shown tension member 3 is known per se and is made of fibre reinforced plastic (FRP). Another example of tension member can be a 25 basalt fibre composite reinforcing bar or rod, e.g. RockBar as marketed by

MagmaTech, UK. The tension member 3 is coupled with the second coupling member 4, specifically the second coupling member body 6, by a treaded connection 18. Therefore, the tension member is 3 is provided with an outside thread 16 for engaging hardened grout. The shape of the thread 16 is uncommon for a threaded connection 18. 30 The outside thread 16 couples with a female thread 17 provided in the second coupling member body 6 which female thread 17 is configured to mate with the outside thread 16 of the tension member 3 to constitute the threaded connection 18.

4

The threaded connection 18 is configured such that the coupled tension member 3 has a play of about 1 mm to several millimeters along the thread axis 19. Therefore the second coupling member body 6 has a body recess 7 provided with a female thread 17 wherein a threaded end of the tension member 3 is accommodated with a loose fit. This 5 loose fit facilitates screwing of the tension member 3 into the body recess 7 over a considerable overlap Lo. The second coupling member body 6 overlaps with the tension member 3 along its longitudinal axis with an overlap Lo of at least 50 mm.

Here, the diameter D of the body recess 7 is about 15 mm, however other diameters are conceivable. The pitch p of the threaded connection 18 is about 10 mm. 10 The ratio of the overlap Lo and the diameter D of the body recess 7 exceeds 1, preferably 1,5.

The anchor 1 is shown in its set position wherein the longitudinal axis 12 of the anchor 1 is substantially transverse with respect to the longitudinal axis 8 of the tension 15 member 3.

The anchor 1 comprises a first coupling member 2 for temporary coupling the anchor with an elongate driving member, like a rod, to drive the anchor to a desired depth. The first coupling member 2 comprises a first coupling member cavity 11 for 20 accommodating an end of the elongate driving member. The first coupling member cavity 11 is here defined by a cavity wall 16. The first coupling member cavity 11 extends along the longitudinal axis 12 of the anchor 1. The first coupling member cavity 11 and the end of the elongate driving member have a loose fit for temporarily coupling the driving device with the anchor 1 and release the end of the elongate 25 driving member from the first coupling member cavity 11 once the desired depth for the anchor 1 has been reached.

It will also be obvious after the above description and drawings are included to illustrate some embodiments of the invention, and not to limit the scope of protection. 30 Starting from this disclosure, many more embodiments will be evident to a skilled person which are within the scope of protection and the essence of this invention and which are obvious combinations of prior art techniques and the disclosure of this patent.

Claims

1. Samenstel van een draaibaar grondanker en een trekelement, het grondanker 5 omvattende; - een eerste koppelelement (2) voor het tijdelijk koppelen van het grondanker met een aandrijfstang om het grondanker tot een aanzienlijke diepte in de grond te drijven; en, - Een tweede koppelelement (4) dat het grondanker vast verbind met het 10 trekelement zodat het grondanker draait wanneer de aandrijfstand wordt terug getrokken, waarbij het trekelement (3) bruikbaar is voor het koppelen van het grondanker met het voorwerp dat verankerd moet worden, en vezelversterkt materiaal omvat. 15An assembly of a rotatable ground anchor and a tension element, comprising the ground anchor; - a first coupling element (2) for temporarily coupling the ground anchor with a driving rod to drive the ground anchor to a considerable depth in the ground; and, - A second coupling element (4) that firmly connects the ground anchor to the pulling element so that the ground anchor rotates when the drive position is pulled back, the pulling element (3) being usable for coupling the ground anchor to the object to be anchored and fiber-reinforced material. 15

2. Samenstel volgens conclusie 1, waarbij het trekelement is vervaardigd van vezelversterkt materiaal.Assembly according to claim 1, wherein the tension element is made of fiber-reinforced material.

3. Samenstel volgens een van de voorgaande conclusies, waarbij het vezelversterkt 20 materiaal kunststof omvat.3. Assembly as claimed in any of the foregoing claims, wherein the fiber-reinforced material comprises plastic.

4. Samenstel volgens een van de conclusies 2-3, waarbij het trekelement een holle of massieve stang is.Assembly as claimed in any of the claims 2-3, wherein the tension element is a hollow or solid rod.

5. Samenstel volgens een van de voorgaande conclusies, waarbij het trekelement (3) met het tweede koppelelement door middel van een schroefverbinding is gekoppeld.Assembly as claimed in any of the foregoing claims, wherein the tension element (3) is coupled to the second coupling element by means of a screw connection.

6. Samenstel volgens conclusie 5, waarbij de schroefverbinding is ingericht voor 30 het verkrijgen van een speling van ongeveer lmm tot enkele milimeters langs de schroefdraad.6. Assembly as claimed in claim 5, wherein the screw connection is adapted to obtain a play of approximately 1 mm to a few millimeters along the screw thread.

7. Samenstel volgens een van de voorgaande conclusies, waarbij het tweede koppelelement een tweede koppelelementlichaam (6) omvat, die voorzien is van een lichaamsholte (7) voorzien van een vrouwelijke schroefdraad, waarin een draadeind van het trekelement is opgenomen die ruim past. 5An assembly according to any one of the preceding claims, wherein the second coupling element comprises a second coupling element body (6) which is provided with a body cavity (7) provided with a female screw thread, in which a threaded end of the tension element is accommodated that fits broadly. 5

8. Samenstel volgens een van de voorgaande conclusies, waarbij het tweede koppelelementlichaam met het trekelement overlapt langs haar longitudinale as met ten minste een overlap (L0) van minstens 60 mm.Assembly as claimed in any of the foregoing claims, wherein the second coupling element body overlaps with the tension element along its longitudinal axis with at least an overlap (L0) of at least 60 mm.

9. Samenstel volgens een van de conclusies 7-8, waarbij de diameter (D) van de lichaamsholte groter is dan 15 mm.An assembly according to any of claims 7-8, wherein the diameter (D) of the body cavity is greater than 15 mm.

10. Samenstel volgens een van de conclusies 8-9, waarbij de verhouding tussen de overlap (L0) en de diameter (D) van de lichaamsholte groter is dan 1, 15 bijvoorkeer 1,5.An assembly according to any of claims 8-9, wherein the ratio between the overlap (L0) and the diameter (D) of the body cavity is greater than 1.15, for example 1.5.

11. Samenstel volgens een van de voorgaande conclusies, waarbij het trekelement een basalt vezelversterkt composietmateriaal omvat.11. Assembly as claimed in any of the foregoing claims, wherein the tension element comprises a basalt fiber-reinforced composite material.

12. Het gebruik van een trekelement, vervaardigd van een vezelversterkte kunststof, in een draaibaar grondankersamenstel.12. The use of a tension element made of a fiber-reinforced plastic in a rotatable ground anchor assembly.