EP3115511A1 - Method for making an overlapped drilling pile wall - Google Patents

Abstract

A method for producing a secant bored pile wall (8), wherein after the introduction of primary piles (9) in each case between two adjacent primary piles (9), a secondary pile (10) is introduced with overcut, is with regard to particularly fast and easy making a secant bored pile wall designed such that the secondary pile (10) is designed as a screw boring pile.

Description

The invention relates to a method for producing a superimposed bored pile wall, with an insertable into a subsoil auger and a drive for rotating and advancing the auger into the ground, said auger at least one extending in a longitudinal direction of the auger helix and cutting tools for cutting and / or has cutting and / or cutting processing of the substrate.

Methods of the type mentioned are known in practice and exist in different embodiments and sizes. Such devices are used in the field of auger drilling, also known as Auger Stone Concrete (SOB), for borehole foundation. With pile and bored pile foundations, the loads of structures can be removed into deeper, load-bearing soil layers. Pile foundations in auger drilling technology are particularly low in vibration and noise compared to conventional pile and bored pile technology and are therefore also suitable for densely built-up inner city areas or in the vicinity of vibration-sensitive production facilities. Because auger piles are made on-site, uncased, without pipes that need to be pre-drilled, unplanned changes can be made relatively easily compared to cased boring systems.

In a conventional SOB process, a pile is drilled with a hollow auger and, after reaching a desired depth by concrete supply via a running in the auger core tube of the auger while simultaneously extracting the auger concrete. For this purpose, the upper end with a conventional concrete pressure transducer is permanently connected to a supply line for fresh concrete. During drilling and concreting, the borehole wall is supported by the soil filled flights.

Auger bored piles are always concreted up to the surface of the terrain in order to enable a subsequent insertion of a reinforcement. This reinforcement is set in these piles immediately after concreting in the fresh concrete shaft of the pile, possibly with a light pull-in or Rüttelhilfe. The reinforcement may be tapered downwardly to allow central penetration into the fresh concrete of the bored pile.

A usual pile production takes place with a complete and as automated as possible and quality assured drilling data acquisition. With this drilling data acquisition u.a. the drilling progress, the production period, the rotation of the auger, the concreting pressure and the concrete quantity are recorded.

In the SOB process, a much more economical production of piles is possible than in the conventional production of piles by means of introduced into the ground pipes. In the SOB process, in particular, piles can be produced faster than in the conventional method.

Furthermore, it is known in the prior art to produce over-cut bored pile walls with the prior art with pre-drilled pipes. In doing so, the pipes to be inserted cut adjacent primary piles, whereby the pipes to be introduced are simultaneously guided through the trimmed primary piles during the introduction. Such pipes usually have cutting tools on a pipe end.

Starting from the above-described prior art, the present invention has the object to provide a method for producing a screw boring pile, according to which a particularly fast production of screw bored piles is possible in a particularly large number of different substrates with structurally simple means.

According to the invention the above object is achieved by a method having the features of claim 1.

In accordance with the invention, it has been recognized that by clever arrangement of the cutting tools an optimization of the device and in the concrete of the auger with respect to an effective operation in particular a variety of substrates is made possible in a surprisingly simple manner. For this purpose, in a further inventive manner in the concrete cutting tools on an outer edge of the at least one coil at least partially arranged. By this departure from only downwards, ie in the drilling direction, arranged cutting tools is a particularly safe and uniform Milling action provided during the introduction of the auger into the ground. In particular, this milling action also supports the guidance of the auger when introducing a secondary pile in overcut to already produced primary piles. The use of drill pipes is no longer necessary, so that the auger drilling technique can also be used in the production of secondary piles of a secant bored pile wall in an advantageous manner. Thus, with the device according to the invention also secant bored pile walls can be built faster and thus more economically than with conventional technologies.

Accordingly, the above object is achieved by a method having the features of claim 1, wherein the auger pile is a secondary pile of a superimposed bored pile wall. On the basis of the present invention, it is advantageously possible to deviate from the usual technique to be introduced with drill pipes and create secondary piles by means of auger drilling. Advantageously, in this case two primary piles can be cut by means of cutting tools. Further preferably, intermediate surfaces of the produced gates can be milled off at the primary piles during insertion of the auger. As a result, this allows a secure production of secondary piles between adjacent primary piles in overcut bored pile walls.

The cutting tools are arranged at least in sections on the outer edge of the at least one helix. Depending on requirements, the cutting tools can be arranged in greater density or at a greater distance from each other. Also, the cutting tools - depending on the application - not along the entire coil but, for example, be arranged only in a front to middle region of the helix. Here, the configuration of the helix and in particular the placement of the helix with cutting tools on the outer edge can be implemented as required and also taking into account economic aspects with more or less cutting tools.

In order to realize a particularly symmetrical design which is balanced when it is brought into a substrate with respect to occurring torques, the auger may have two spirals. These may be in the sense of a Double helix can be arranged with two simple spirals running around each other. Such a structure may also be referred to as a double-threaded screw. Such a double helix structure is particularly favorable when introduced into inhomogeneous substrates, since the symmetrical arrangement of the helixes largely prevents a sideways running of the auger. A secure positioning of a bored pile is thereby made possible.

In an advantageous embodiment of the device, the cutting tools arranged on the outer edge can extend substantially radially to the longitudinal direction of the auger. This radial arrangement has the advantage that when cleaning a Bohrschnecke conventional screw cleaner - unhindered by the cutting tools - can be used. The Schneckenputzer arrive here in concrete without hindrance in the spaces between the helices.

In view of a problem-free long-term use of the device, the cutting tools can have interchangeable cutting elements and / or change lugs. In the case of worn or worn cutting tools can thus be a simple restoration of the functionality of the device - by a simple exchange - achieve. Elaborate welding work for attaching cutting tools to the helix can be dispensed with.

With regard to a safe and targeted introduction of the auger into a substrate, the auger may have a guide element for guiding the auger when introduced into the ground. As a result, a targeted introduction of the auger is possible even with inhomogeneous ground. In the embodiment of the guide element different substrate materials can be considered.

In a particularly advantageous manner, the guide element can be arranged or formed on a head region or milling head of the auger or on a front end of the at least one helix. In this case, the guide element may preferably have cutting tools to undertake a background machining during the guiding function.

Also with regard to a safe introduction of the auger into the ground, a head portion of the auger or the at least one helix may have a preferably double-edged cutting bar. Such a cutting bar can serve not only to work the substrate, but also to provide a guide for the auger. For example, in the production of a secondary pile in the case of overcut bored pile walls, the cutting strip can serve firstly for cutting the primary piles adjacent to the secondary pile to be produced. Immediately after the cutting of the primary piles can be done by the primary piles guide, since the cutting bars can be performed by the recesses produced in the primary piles in their rotary motion.

Such a cutting bar may extend along a predeterminable section or along predeterminable sections of a diameter of the auger. In this case, the cutting bar can extend substantially to the outer edge of the diameter, for example, to be guided substantially in recesses in primary piles, which are produced in the production of a secondary pile in the adjacent primary piles. Alternatively, a cutting bar along a diameter of the auger may extend just enough to fit exactly between two primary piles. As a result of this, a guiding function is achieved when introducing the auger between the primary piles. In a specific embodiment, in which a central line for fresh concrete to be introduced is formed in the longitudinal direction of the auger, two cutting strips can be realized, each extending between about the inner pipe and each a primary pile.

In an advantageous manner, in each case a cutting bar can be formed on a helix at the front end thereof, so that when two helixes are realized in the auger, two cutting bars can assume a guiding function which extends in a symmetrical manner along a diameter of the auger.

Furthermore, with regard to a safe guidance of the auger when introduced into a substrate and with regard to an easy insertion into the ground, the at least one helix in a front region of the helix with a be formed along at least a portion of the diameter gradually decreasing diameter. In other words, the at least one helix may be tapered conically or conically at its front end. Such a design is of particular advantage in particular in the production of a secondary pile, since the auger can be incorporated particularly incessantly and gradually into adjacent primary piles when introduced into the substrate or can be incorporated. In this case, primary piles can be provided particularly uniformly with the recess required for the secondary pile.

When choosing the number of cutting elements or cutting tools on the outer edge of the at least one coil is to be noted that too many cutting elements or cutting tools mean a cross-sectional constriction, which can lead to a feed reduction.

In an embodiment of a cutter bar at the front end of a helix, the helices can shred the above when cutting into a primary pile cross-section above it upwards.

Fig. 1

ein erstes Ausführungsbeispiel eines vorderen Endes einer Bohrschnecke einer erfindungsgemäßen Vorrichtung, wobei dieser Teil der Bohrschnecke in einer Seitenansicht und in einer Unteransicht gezeigt ist,

Fig. 2

ein zweites Ausführungsbeispiel eines vorderen Endes einer Bohrschnecke einer erfindungsgemäßen Vorrichtung, wobei dieser Teil der Bohrschnecke in einer Seitenansicht und in einer Unteransicht gezeigt ist, und

Fig. 3

in einer schematischen Darstellung einen Abschnitt einer überschnittenen Bohrpfahlwand.

There are now various possibilities for designing and developing the teaching of the present invention in an advantageous manner. For this purpose, on the one hand to refer to the subordinate claims and on the other hand to the following explanation of preferred embodiments of the invention with reference to the drawings. In conjunction with the explanation of the preferred embodiments of the invention with reference to the drawings, also generally preferred embodiments and developments of the teaching are explained. In the drawing show

Fig. 1

a first embodiment of a front end of a auger of a device according to the invention, this part of the auger is shown in a side view and in a bottom view,

Fig. 2

a second embodiment of a front end of a auger of a device according to the invention, wherein this part of Bohrschnecke is shown in a side view and in a bottom view, and

Fig. 3

in a schematic representation of a section of a secant bored pile wall.

Fig. 1 shows a first embodiment of a portion of a drilling auger 1 of a device according to the invention for producing a screw boring pile. The device has an insertable into a substrate drilling screw 1 and a drive not shown here for rotating and advancing the auger 1 in the ground. In Fig. 1 a front part of a drilling auger 1 is shown, this front part being shown in two perspectives. At the bottom of the Fig. 1 a side view of the part of the auger 1 is shown, which is rotatable about a longitudinal direction 2 of the auger 1. In the upper area of the Fig. 1 this front part of the auger 1 is shown in a bottom view.

The auger 1 has two spirals 3 extending in the longitudinal direction 2 of the auger 1 and cutting tools 4 for milling and / or cutting and / or cutting the substrate.

With regard to a particularly fast production of worm bored piles in a particularly large number of different substrates, cutting tools 4 are arranged in sections on an outer edge 5 of the filaments 3. The cutting tools 4 arranged along the outer edges 5 of the helixes 3 allow a uniform milling, cutting or cutting of a substrate or a primary pile in the production of a secondary pile of a secant bored pile wall.

Along the longitudinal direction 2 of the auger 1 runs in the auger 1 and within the coils 3, a line for supplying fresh concrete for the auger pile to be produced. The coils 3 thus run around the conduit.

At the front or lower end of the part of the auger 1, a guide element 6 is arranged. The guide element 6 also has cutting tools 4.

At the front ends of the coils 3, a double-edged cutting bar 7 is formed in each case. The cutting strips 7 are formed along a predeterminable portion of a diameter of the auger 1 to the outer edge of the diameter. The outer ends of the cutting bars 7 thus extend substantially to the outer edge 5 of the helices 3. These cutting bars 7 a guide function when introducing the auger 1 is realized in the ground. Concretely, the cutting bars 7 extend from an inner region of the auger 1 formed substantially through the conduit for the concrete to the outer edge 5 of the helixes 3.

At the end remote from the guide element 6 of the front part of the auger 1, which can also be designated as a milling head, a coupling region for coupling one or further sections of the auger 1 is formed.

Fig. 2 shows a part of a drilling auger 1 according to a second embodiment of the device according to the invention. It corresponds Fig. 2 in their construction the Fig. 1 , wherein in this second embodiment, only the coils 3 and the cutting strips 7 differ from the first embodiment.

Otherwise shows too Fig. 2 the second embodiment in a side view and in a bottom view.

In the second embodiment, the two coils 3 are formed in a front portion having a gradually decreasing diameter along a portion of the diameter. In other words, the coils 3 run towards the front end of the auger 1 - along a longitudinal section of the auger 1 - tapered or tapered or conical. This has the consequence that the cutting strips 7 at the front ends of the helixes 3 do not extend to the outer edge of the diameter of the auger 1, but are formed shorter.

In the production of a secant bored pile wall, the width of the auger 1 in the region of the cutting strips 7 correspond to the distance between two primary piles, so that through the front end of the auger 1 or the coils 3 reaches a guide of the auger 1 between the primary piles becomes.

At the in Fig. 2 In the embodiment shown, the cutting strips 7 would only work on the area of the substrate present between adjacent primary piles and no longer on the primary piles themselves, as is the case in FIG Fig. 1 the embodiment shown would be the case.

The size of the diameter of the auger 1 increasing from the cutting strips 7 along the helixes 3 up to the in Fig. 2 shown rear portion of the front part of the auger 1 allows a particularly safe and continuously deeper cutting in primary piles when introducing the auger 1 in the ground. In this case, the concrete material to be removed on the primary piles is continuously removed or milled off or sheared off by turning the drilling screw 1 - virtually to the top.

At the bottom of the Fig. 2 it can be seen particularly clearly that the cutting tools 4 of the helixes 3 extend along a wider radial area than in the case of FIG Fig. 1 the embodiment shown is the case in which the cutting tools 4 are only along a circle formed by the outer edge 5.

Fig. 3 shows a schematic representation of a part of a secant bored pile wall 8 during their production. After the introduction of primary piles 9, the secondary piles 10 are introduced between juxtaposed primary piles 9 with overcut. At the in Fig. 3 shown bored pile wall 8 of the secondary post 10 shown on the left in the figure is not formed to the upper edge 11 of the bored pile wall 8.

At the in Fig. 3 The bored pile wall 8 shown clearly shows the recess 12 produced in the primary piles 9 when the secondary piles 10 are introduced. With regard to further advantageous embodiments of the method according to the invention for producing a screw boring pile, reference is made to the general part of the description and to the appended claims in order to avoid repetition.

Finally, it should be expressly understood that the embodiments described above are only for the purpose of discussion of the claimed teaching, but not limit these to the embodiments.

LIST OF REFERENCE NUMBERS

1

auger

2

longitudinal direction

3

spiral

4

cutting tool

5

outer edge

6

guide element

7

cutting bar

8th

pile wall

9

Primary pile

10

Secondary pole

11

upper edge

12

recess

Claims (10)

A method for producing a cut-over bored pile wall (8), wherein after the introduction of primary piles (9) between each two adjacent primary piles (9) a secondary pile (10) is introduced with overcut,
characterized in that the secondary pile (10) is designed as a screw boring pile. A method according to claim 1, characterized in that the screw boring pile is formed with a SOB (screw-clay concrete) method. A method according to claim 1 or 2, characterized in that the auger pile is formed with a device for producing a screw boring pile having a drill screw (1) which can be introduced into a substrate and a drive for rotating and advancing the auger (1) into the substrate, wherein the auger (1) has at least one helix (3) extending in a longitudinal direction (2) of the auger (1) and cutting tools (4) for milling and / or cutting and / or cutting the substrate, and wherein at an outer edge (5 ) of the at least one coil (3) at least partially cutting tools (4) are arranged. A method according to claim 3, characterized in that arranged on the outer edge (5) cutting tools (4) extend substantially radially to the longitudinal direction (2) of the auger (1) and / or that the cutting tools (4) interchangeable cutting elements and / or Have change cleats. A method according to claim 3 or 4, characterized in that the auger (1) has a guide element (6) for guiding the auger (1) when introduced into the ground. A method according to claim 5, characterized in that the guide element (6) on a head portion or milling head of the auger (1) or on a front end of the at least one coil (3) is arranged or formed and preferably cutting tools (4). Method according to one of claims 3 to 6, characterized in that a head portion of the auger (1) or the at least one helix (3) has a preferably double-edged cutting bar (7). A method according to claim 7, characterized in that the cutting bar (7) along a predetermined portion or along predeterminable sections of a diameter of the auger (1), preferably substantially to the outer edge of the diameter down or exactly between two primary piles (9 ) extends. A method according to any one of claims 1 to 8, characterized in that the at least one coil (3) is formed in a front region of the helix (3) having a gradually decreasing along at least a portion of the diameter of diameter. A method according to claim 9, characterized in that two primary piles (9) cut by means of cutting tools (4) and preferably when inserting the auger (1) milled surfaces of the cuts produced.

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