Method for forming foundation pile in ground

Abstract

The invention relates to a method for forming a foundation pile in the ground, in which a drill is established in the ground, a pile tube is gripped and placed into the drill by means of an operating device, and a hardenable medium is introduced into the annular space between the wall of the drill and the outer circumference of the pile tube, which hardens to form the foundation pile. According to the invention, a hardenable medium is introduced into the drilling section via an operating device.

Description

Technical Field

[0001] The invention relates to a method for forming a foundation pile in the ground, in particular in the bottom of a body of water, according to the preamble of claim 1, wherein a drilling section is created in the ground, a pile pipe is grasped by means of an operating device and inserted into the drilling section, and a hardenable medium is introduced into the annular space between the wall of the drilling section and the outer circumference of the pile pipe, which hardenable medium hardens to form the foundation pile. Background Art

[0002] A method and assembly for manufacturing foundation piles for buildings in water are known from EP 2 930 275 A1. In this method, a borehole with a support pipe is first established in the ground. The drilling section produced here is filled with liquid, especially water. The pile pipe is placed in the casing drilling section established in this way, and a simple steel pipe with a tubular matrix is ​​used for the pile pipe. The support pipe located outside is then pulled out, and the annular space between the pile pipe placed and erected on the bottom of the borehole and the surrounding drilling section wall is filled with a hardenable medium. The surrounding water can remain in the pile pipe. The bearing capacity of the foundation pile established in this way is determined by the hardening medium in the outer peripheral surface of the pile pipe placed relative to the surrounding ground and the surrounding annular space. The inner space that is only filled with water can be used to introduce, for example, measurement or testing equipment when necessary.

[0003] A device for handling a pile pipe and inserting it into a drilling section is known from WO 2021 / 180515 A1. The device is designed to be mounted on the support rope of a crane. The annular edge of the pile pipe can be gripped by means of a gripping element. In general, the device is designed so that the pile pipe can be pivoted from a horizontal storage position into a vertical insertion position.

[0004] From US 2010 / 0296875 A1, an assembly and a method for producing an underwater foundation using an underwater drilling rig are known. The underwater drilling rig can be placed on the bottom of a body of water. The foundation drilling section is established with the aid of tubular elements. The tubular elements can also be used to anchor the drilling device underwater at the same time.

[0005] In the known method, after the pile pipe has been placed in the drilled section, the annular space between the circumference of the pile pipe and the surrounding drilled section wall is filled. For this purpose, it is known to introduce one or more supply hoses into the annular space and then introduce a hardenable medium, such as mortar or cement suspension, into the annular space via the supply hoses. The introduction of the hardenable medium should be carried out as far as possible in this case so that the annular space is filled from below, so that the liquid, in particular water, present in the annular space is displaced from below to above by the hardenable medium.

[0006] The introduction of the hose into the annular space is usually done manually from outside the drilling section. In the case of a drilling section depth of 10 meters or more, there is the problem that the supply hose may get stuck in the central area of ​​the drilling section and therefore not reach the bottom of the borehole. This cannot usually be determined from outside the drilling section. If a hardenable suspension is input in the case of such an incorrectly introduced supply hose, the liquid may remain in the annular space below the supply hose and be surrounded by the hardenable suspension located above it. In such a case, after the suspension hardens, the pile pipe will not be connected to the surrounding ground over the entire length. The load-bearing capacity of the foundation element formed accordingly is thus reduced, so that a reliable foundation is no longer guaranteed.

[0007] Post-processing of the base element may be necessary, which can be very time-consuming and cost-intensive. If necessary, the base element may even need to be rebuilt.

[0008] It is also known that supply lines for hardenable suspensions are also provided in the pile pipe. Via at least one supply line, the hardenable medium can then be guided in the pile pipe to the lower region of the pile pipe and introduced into the annular space outside the pile pipe via corresponding feedthroughs. In this method, after the introduction of the pile pipe, corresponding supplies for the hardenable suspension must be arranged, up to the feedthrough in the pile pipe into the annular space or up to the upper connection at the pile pipe. The production of the corresponding connection is time-consuming and labor-intensive, and there is also the risk of errors. Summary of the invention

[0009] The object of the present invention is to provide a method with which foundation piles can be produced efficiently and reliably in the ground.

[0010] This object is achieved by a method having the features of claim 1. Preferred embodiments of the invention are specified in the dependent claims.

[0011] The method according to the invention is characterized in that the hardenable medium is introduced into the drilling portion via an actuating device.

[0012] The basic idea of ​​the invention is that the handling device is not only used to grasp the pile pipe and place it in the drilling section, but also to introduce the hardenable medium into the drilling section. In particular, after the pile pipe has been placed in the drilling section, the handling device is not released from the pile pipe, but can remain in a defined starting position on the pile pipe, which is occupied outside the drilling section when the pile pipe is grasped by the handling device. Due to the relative position between the pile pipe and the handling device, which is thus preset, the hardenable medium can be reliably supplied via the handling device.

[0013] A preferred embodiment of the present invention is that the hardenable medium is introduced into the drilling section while the pile pipe is held by the operating device. The operating device can grab the pile pipe in a storage position, especially in a horizontal position, and is therefore preferably connected in a force-fitting manner. Therefore, there is a fixed relative position between the operating device and the grabbed pile pipe from the beginning. Here, a defined relative position between the pile pipe and the operating device can be determined. Then, in this starting position, after the pile pipe is placed in the drilling section, the hardenable medium can be supplied to the pile pipe.

[0014] According to a modification of the method according to the invention, it is preferred that the hardenable medium is guided by means of at least one conveying line through the operating device to at least one supply opening at the pile pipe, wherein the hardenable medium is guided through the pipe wall of the pile pipe via at least one line and escapes into the annular space via at least one discharge opening at the outer periphery of the pile pipe. One or more conveying lines are arranged at the operating device for supplying the hardenable medium, in particular mortar or cement suspension, from a reservoir to the pile pipe, preferably using a pump device. At least one conveying line can be fixedly installed at the operating device or can be installed afterwards after the pile pipe is grabbed. The hardenable medium is transmitted from the conveying line of the operating device via at least one supply opening at the pile pipe, wherein the hardenable medium is guided from the supply opening to the outer periphery of the pile pipe into the lower region via one or more lines (which can also be called pile lines). This ensures that the hardenable medium is reliably supplied to the lower region of the annular space.

[0015] In principle, it is sufficient to provide a single delivery line at the operating device, and to provide only a single line for supplying a hardenable medium at the pile pipe. According to an improved solution of the present invention, in order to maintain functionality for a long time, it is preferred that at least two delivery lines and / or lines are provided, which are connected by means of at least one valve device so that they are connected in parallel to form a dual supply or in series for flushing operation. When at least two lines are provided, the hardenable medium can be supplied faster. In addition, when two lines are arranged, the valve device can be provided so that the valve device can connect the two delivery lines at the operating device and / or the two lines at the pile pipe so that they are connected in series. Thus, flushing liquid can be supplied via the first delivery line or line and flushing liquid can be drawn via the second delivery line or second line. Thus, the delivery line or line can be flushed, and so protected from being blocked by the hardenable medium. This allows that the operating device with the delivery line and / or the pile pipe with the line can be used not only for supplying a hardenable suspension once, but also for supplying a hardenable suspension multiple times.

[0016] According to a preferred method variant of the invention, particularly reliable filling of the annular space is achieved in that at least one escape opening is located in the lower region of the pile pipe and the hardenable medium fills the annular space from bottom to top. Preferably, a plurality of escape openings can also be arranged in the lower region of the pile pipe. It is also possible to arrange a targeted discharge opening in the region of the pile pipe located above it, which discharge opening is preferably not yet opened by means of a valve device at the beginning of the filling, but is opened only at a defined time in the course of the filling process.

[0017] According to an improved solution of the present invention, the undesirable inflow of the hardenable medium into the inner space of the pile pipe can be prevented or greatly limited by thus, that is, at least in the pile pipe, an overpressure is generated at the lower section, which resists the hardenable medium from entering the interior of the pile pipe from the annular space. The overpressure can be generated in any suitable manner. According to an embodiment of the present invention, it is particularly preferred that, in order to form an overpressure in the lower section of the pile pipe, a partition is arranged in the pile pipe, which separates the lower section from the upper section above it. The isolation of the lower section caused by this causes the liquid in the lower section to be surrounded in the lower section and can no longer be squeezed upward. Thus, the slight inflow of the hardenable medium from below has already caused a pressure increase in the lower section, which resists the hardenable medium from further flowing into the pile pipe.

[0018] When using a pile pipe with a partition, a preferred method variant is to open at least one through hole in the partition in order to insert the pile pipe into the drilling part filled with liquid. This ensures that air or liquid is not enclosed in the lower section when the pile pipe is inserted, but can flow freely upward through the partition during insertion. Only after reaching the final position and in particular when the pile pipe is placed on the bottom of the drilled hole, the at least one through hole in the partition is closed, so that the lower section is isolated in a pressure-tight manner. In this state, the partition performs the above-mentioned advantageous function of preventing the hardenable medium from flowing into the interior of the pile in an undesirable manner.

[0019] Therefore, according to another variant of the invention, it is advantageous to close at least one through hole after the pile pipe has been placed on the bottom of the drilled hole and before the hardenable medium is introduced. This measure is particularly suitable if the foundation pile is placed underwater on the bottom of a body of water. In this way, the partition also allows the pile pipe to be quickly lowered into the body of water and into the drilling section by opening the through hole.

[0020] According to one embodiment of the invention, a further improvement in the production of foundation piles is achieved in that, in order to place the pile pipe into the drilling section, an operating device is coupled to a lifting machine, and after the introduction of the hardenable medium, the lifting machine is released from the operating device and the operating device remains on the pile pipe as an additional load, at least until the medium hardens.

[0021] As a hoist, in particular, a load rope or a load rod on a crane can be used. The operating device is connected to the load rope or the load rod via a detachable connecting device (for example a crane hook).

[0022] After the pile pipe has been inserted into the drilling section and the hardenable medium has been introduced into the annular space, the lifting machine can be released from the handling device, while the handling device remains on the pile pipe. The handling device can thus serve as an additional additional load for fixing the pile pipe in position, at least until the hardenable medium has sufficiently hardened and the pile pipe is thus fixed in its position.

[0023] A preferred improvement is that after the medium has hardened, the handling device is released from the pile pipe and recovered. For this purpose, a hoist with a releasable connection device on the support rope or the support rod can be reused to recover the handling device. The handling device can have an energy-operated or mechanical clamping device, in particular for a force-fitting connection to the pile pipe. The connection can be released again to recover the handling device.

[0024] With the method according to the invention, foundation piles can be established at any desired and suitable location in the ground. In particular, the method can be implemented on land, wherein the pile pipe is placed in a drilling section filled with a liquid, in particular water. According to one embodiment of the invention, it is particularly advantageous to establish the foundation piles underwater in the bottom of a body of water as ground. The body of water can be in particular a river, a lake or an ocean.

[0025] In particular, the drilling section at the bottom of the water body is more difficult to access underwater than on land, so that with the method according to the invention a reliable establishment of foundation piles can be carried out even at greater water depths.

[0026] In particular, in the case of lakes or rivers, the method can be performed from the shore by means of corresponding devices. According to an embodiment of the invention, it is particularly suitable that the operating device is operated by a water vehicle. In particular, the water vehicle can be a ship or a pontoon.

[0027] Furthermore, according to an embodiment of the method according to the invention, it is advantageous if the operating device is connected to at least one supply line via a releasable connection device. Via the supply line, also referred to as an umbilical cord, the hardenable medium and energy, in particular electrical, hydraulic and / or pneumatic energy, can be supplied, and data can be transmitted via corresponding data lines. The supply line can thus have a bundle of different lines and / or hoses. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further explained below with reference to preferred embodiments, which are schematically shown in the accompanying drawings. In the drawings:

[0029] Figure 1 A schematic cross-sectional view of a pile pipe with a baffle is shown;

[0030] Figure 2 A schematic diagram showing the lower portion of the pile pipe in the drilling section;

[0031] Figure 3 a schematic detailed cross-sectional view showing the supply device at the bulkhead of the pile pipe; and

[0032] Figure 4 A perspective view of an operating device for operating a pile pipe is shown. DETAILED DESCRIPTION

[0033] according to Figure 1 , a pile pipe 10 with a tubular base body 12 is provided. In the inner region 13 of the tubular base body 12, a partition 20 is arranged which is oriented transversely to the longitudinal axis of the tubular base body 12 and which divides the inner region 13 into a lower section 14 and an upper section 15 and separates them from each other. An annular sealing element 19 can be arranged at the lower edge of the tubular base body 12, by means of which the pile pipe 10 can be placed on the bottom of the borehole in a manner that is as tight as possible.

[0034] In the embodiment shown, the partition 20 has two schematically indicated through-holes 22, which can be opened or closed in a targeted manner by means of a likewise schematically indicated closing device 24. In the central region of the partition 20, a supply device 30 with two schematically indicated supply openings 32 is arranged, each with an introduction funnel 34, as will be described below in conjunction with the present invention. Figure 3 As described in more detail.

[0035] The supply opening 32 with the introduction funnel 34 is used to supply a hardenable medium, in particular a mortar or cement suspension, wherein the hardenable medium can be guided below the partition 20 via the line 26 to the lower end region of the tubular base body 12. The line 26 extends through the tube wall 16 of the base body 12 and opens into the outlet opening 28 at the outer circumference 17 of the base body 12. The hardenable medium can thus be guided via the inner region 13 of the pile pipe 10 to the lower end region and can escape to the outside of the pile pipe 10 via the outlet opening 28, as described below in conjunction with Figure 2 As explained in more detail.

[0036] exist Figure 2, the lower end region of a pile pipe 10 according to the invention is shown schematically and not to scale, which is inserted into a drilling section 4 in the ground 1. Only the lower region of the drilling section 4 is shown, wherein the drilling section 4 can have a depth of several meters, typically between 5 m and 30 m. The drilling section 4 is filled with a liquid, in particular water or another supporting liquid, for support, so that the drilling section 4 does not collapse even at greater drilling section depths. A supporting tube can also be provided at least in places.

[0037] When the through hole 22 at the partition 20 is opened by the closing device 24, the pile pipe 10 with the partition 20 can be placed without any problems into the drilling part 4 thus filled with liquid. After the final position of the pile pipe 10 is reached, in particular when the pile pipe 10 is placed on the drilled hole bottom 5 of the drilling part 4, the through hole 22 can be closed again by means of the closing device 24. The hardenable medium can now be introduced into the drilling part 4 via the line 26, wherein the hardenable medium is supplied in the pile pipe 10 in the lower region via the line 26 and passes through the tube wall 16 in the lower region and can escape into the annular space 6 via the outlet opening 28. The annular space 6 is formed between the outer circumference 17 of the tubular base body 12 and the substantially cylindrical wall 8 of the drilling part 4. In this case, the hardenable medium can fill the annular space 6 from the bottom to the top due to its higher density compared to the liquid in the drilling part 4. The liquid is hereby displaced upwards from the annular space 6 by the hardenable medium.

[0038] When the through hole 22 is closed, the lower section 14 of the inner region 13 of the pile pipe 10 is sealed upward by the provided partition 20. Therefore, the liquid in the lower section 14 of the pile pipe 10 cannot be squeezed upward, so that no or almost no hardenable medium can penetrate into the inner region 13 of the pile pipe 10. As a result, the inner region 13 can be reliably kept unobstructed and hardenable medium or suspension can be saved.

[0039] according to Figure 3 More precisely, the Figure 1 The supply device 30 of the pile pipe 10 is provided. The supply device 30 can have a pot-shaped receptacle 31, which is arranged in the central area of ​​the partition 20. A supply opening 32 for guiding the outgoing line 26 downward is formed in the pot-shaped receptacle 31. For introducing the hardenable medium, the supply opening 32 has an introduction funnel 34 in its upper area. In addition, the supply opening 32 can be formed with a non-return valve 36, which is only schematically shown, which prevents an undesired backflow of the hardenable medium from the line 26 in the example shown.

[0040] According to the invention, for supplying the hardenable medium, a method according to Figure 4The operating device 50 has a base body 52 with a cover plate 54 on which a sleeve element 58 is arranged for placing the operating device 50 on or arranging it on the pile pipe 10 .

[0041] Via a gripping device 56 (which can alternatively or additionally also be designed as a force-locking clamping device), the handling device 50 can be releasably attached to the inner side of the pile pipe 10 with at least one clamping or gripping element 57 in the illustrated embodiment. Preferably, a plurality of gripping elements 57 are arranged along the circumference of the approximately tubular or barrel-shaped base body 52.

[0042] With the handling device 50, the pile pipe 10 can be already grasped from the pile pipe storage at the ground surface or at a water vehicle. When grasping, the pile pipe 10 can have any position, for example arranged horizontally or vertically. The handling device 50 can be connected to a hoist, in particular a crane, via a holding element 55 at the upper end region of the base body 52. ​​Thus, the pile pipe 10 can be placed from the storage position into the drilling section 4 in the ground 1 via the handling device 50.

[0043] Furthermore, the handling device 50 is provided with a supply device 60, which is indicated only schematically and which, in the illustrated embodiment, has a conveying line 64 which extends from an inlet device 62 at the upper end of the base body 52 to a lower discharge device 66. The discharge device 66 is designed to engage via the introduction funnel 34 of the supply device 30 in accordance with Figure 3 In addition, a corresponding coupling unit can be provided at the operating device 50 to ensure accurate positioning and position fixation in cooperation with the coupling element 23 at the supply device 30 of the pile pipe 10.

[0044] Via a supply line 80, which can also be referred to as an umbilical cord, hardenable medium, energy and / or data can be supplied via a releasable connection device 70, wherein the hardenable medium is transferred to the inlet device 62 at the upper end region of the base body 52. ​​Either a single supply line or separate lines can be provided.

[0045] After the annular space 6 has been filled with the hardenable medium, the connecting line 80 and / or the hoist can be released from the retaining element 55, wherein the handling device 50 can remain as an additional additional load on the pile pipe 10, at least until the hardenable medium hardens to form a foundation element in the ground 1. The handling device 50 can then be released from the pile pipe 10 again and retracted.

Claims

1. A method for forming foundation piles in the ground (1), wherein - establishing a drilling section (4) in the ground (1), - grab the pile pipe (10) by means of the handling device (50) and place it into the drilling part (4), and - introducing a hardenable medium into the annular space (6) between the wall (8) of the drilling part (4) and the outer periphery (17) of the pile tube (10), the hardenable medium hardening to form the foundation pile, It is characterized in that The hardenable medium is introduced into the drilling part (4) via the actuating device (50).

2. The method according to claim 1, It is characterized in that While the pile tube (10) is held by the handling device (50), the hardenable medium is introduced into the drilling part (4).

3. The method according to claim 1 or 2, It is characterized in that The hardenable medium is guided by means of at least one conveying line (64) through an operating device (50) to at least one supply opening (32) at the pile pipe (10), wherein the hardenable medium is guided via at least one line (26) through the pipe wall (16) of the pile pipe (10) and escapes into the annular space (6) via at least one discharge opening (28) at the outer circumference (17) of the pile pipe (10).

4. The method according to claim 3, It is characterized in that Two supply lines (64) and / or lines (26) are provided, which are connected by means of at least one valve device in such a way that they are connected in parallel to form a double supply line or in series for flushing operation.

5. The method according to claim 3 or 4, It is characterized in that At least one discharge outlet (28) is located in the lower region of the pile tube (10), and the hardenable medium fills the annular space (6) from bottom to top.

6. The method according to any one of claims 1 to 5, It is characterized in that An overpressure is generated in the pile pipe (10) at least in the lower section (14), which counteracts the entry of the hardenable medium from the annular space (6) into the interior of the pile pipe (10).

7. The method according to claim 6, It is characterized in that In order to generate an overpressure in the lower section (14) of the pile pipe (10), a partition (20) is arranged in the pile pipe, which partition separates the lower section (14) from an upper section (15) located thereabove.

8. The method according to claim 7, It is characterized in that In order to place the pile pipe (10) into the drilling portion (4) filled with liquid, at least one through hole (22) on the partition (20) is opened.

9. The method according to claim 7 or 8, It is characterized in that After the pile tube (10) has been placed on the drilled hole bottom (5) and before the hardenable medium is introduced, the at least one through hole (22) is closed.

10. The method according to any one of claims 1 to 9, It is characterized in that In order to place the pile pipe (10) into the drilling part (4), the operating device (50) is connected to a hoist, and After the hardenable medium has been introduced, the lifting machine is released from the handling device (50) and the handling device (50) remains on the pile pipe (10) as an additional load, at least until the medium hardens.

11. The method according to claim 10, It is characterized in that After the medium has hardened, the operating device (50) is released from the pile pipe (10) and recovered.

12. The method according to any one of claims 1 to 11, It is characterized in that The foundation piles are established underwater in the bottom of a body of water as the ground (1).

13. The method according to any one of claims 1 to 12, It is characterized in that The operating device (50) is operated by a water vehicle.

14. The method according to any one of claims 1 to 13, It is characterized in that The operating device (50) is connected to at least one supply line (80) via a detachable connecting device (70).

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