Foundation engineering method and construction apparatus for producing a columnar structure in the ground

Abstract

The invention relates to a foundation engineering method and a construction apparatus for producing a columnar structure in the ground, in which a foundation engineering tool is driven in a rotating manner about an axis of rotation and introduced with a feeding motion into a ground, wherein the columnar structure is produced in the ground. According to the invention it is provided that during the production of the columnar structure a rotating motion and a feeding motion of the foundation engineering tool are recorded over time and forwarded to an evaluation unit, in that by means of a sensor means at least one further processing parameter is recorded over time during the production of the columnar structure in the ground and is forwarded to the evaluation unit and in that by the evaluation unit a three-dimensional model of the columnar structure is produced and displayed.

Claims

1. A foundation engineering method for producing a columnar structure in the ground, in which a foundation engineering tool is driven in a rotating manner about an axis of rotation and introduced with a feeding motion into a ground, wherein the columnar structure is produced in the ground, wherein during the production of the columnar structure a rotating motion and a feeding motion of the foundation engineering tool are recorded over time and forwarded to an evaluation unit, by means of a sensor means at least one further processing parameter is recorded over the time during the production of the columnar structure in the ground and is forwarded to the evaluation unit and in that by the evaluation unit a three-dimensional model of the columnar structure is produced and displayed, wherein by the evaluation unit a helical time axis is formed depending on the rotating motion and feeding motion recorded over time and in that the at least one processing parameter recorded over time is assigned to the helical time axis in order to form the three-dimensional model.

2. The foundation engineering method according to claim 1, wherein as columnar structure a foundation pile is produced in the ground.

3. The foundation engineering method according to claim 1, wherein as foundation engineering tool a drilling tool with injection opening or an injection lance is used for injecting a hardenable suspension and a hardenable suspension is introduced into the ground by the rotating foundation engineering tool in order to produce the columnar structure.

4. The foundation engineering method according to claim 1, wherein as at least one further operating parameter an injection pressure, a pump pressure, an injection volume, a temperature, a tool deflection and/or a measured sound value is recorded.

5. The foundation engineering method according to claim 1, wherein following assignment of the at least one processing parameter to the helical time axis the three-dimensional model of the columnar structure is formed through interpolation by the evaluation unit.

6. The foundation engineering method according to claim 1, wherein the rotating motion is directly recorded on a rotary drive or by a rotational-speed measuring element on the foundation engineering tool.

7. The foundation engineering method according to claim 1, wherein the feeding motion is directly recorded on a feed drive or by a distance measuring element on the foundation engineering tool.

8. The foundation engineering method according to claim 1, wherein in the evaluation unit a three-dimensional target model is stored for the columnar structure to be produced in the ground, by the evaluation unit the ascertained three-dimensional model for the columnar structure is compared as an actual model with the target model and on a display means deviations between the target model and the actual model are displayed.

9. A construction apparatus for producing a columnar structure in the ground, in particular using a foundation engineering method according to claim 1, having a foundation engineering tool which can be driven in a rotating manner about an axis of rotation by means of a rotary drive and can be displaced in a feeding direction into the ground by means of a feed drive, at least one recording means for recording a rotating motion of the foundation engineering tool and a feeding motion over time and at least one sensor means for recording at least one further processing parameter, wherein an evaluation unit is provided which is connected to the at least one recording means and the sensor means, wherein the evaluation unit is designed to produce a three-dimensional model of the columnar structure on the basis of the recorded data, and a display means is provided, with which the produced three-dimensional model of the columnar structure can be displayed.

10. The construction apparatus according to claim 9, wherein the foundation engineering tool is a drilling tool with injection opening or an injection lance for injecting a hardenable suspension.

11. The drilling apparatus according to claim 9, wherein a rotational-speed measuring element is provided, with which a rotating motion of the foundation engineering tool can be recorded over time, and/or a distance measuring element is provided, with which a displacement distance of the foundation engineering tool can be recorded over time.

Description

(1) The invention will be explained hereinafter by way of preferred embodiments illustrated schematically in the drawings, wherein show:

(2) FIG. 1 a section of a construction apparatus, illustrated in a highly schematic manner, during the production of a columnar structure in the ground;

(3) FIG. 2 a measurement data example of a data curve of a measured sound intensity over time during the production of a columnar structure in the ground according to the arrangement of FIG. 1;

(4) FIG. 3 a helical illustration of the time axis t over the distance s, in which case a 360° segment of the helix corresponds to a rotation of the foundation engineering tool according to FIG. 1; and

(5) FIG. 4 an illustrative depiction of the schematic transfer of a raw data curve according to FIG. 2 to the helical time axis and the schematic ascertaining of a three-dimensional columnar model therefrom.

(6) FIG. 1 schematically shows an embodiment of a construction apparatus 100 according to the invention for the production of a columnar structure 32 in a ground 3.

(7) As a foundation engineering tool 10 the construction apparatus 100 comprises a drill rod, with which a borehole 5, illustrated in section in FIG. 1, can be produced. On the rod-shaped foundation engineering tool 10 an injection opening 20 is designed. Through this an injection medium 22 can be ejected from the foundation engineering tool 10 into the ground 3. Together with the foundation engineering tool 10 or also independently thereof the injection opening 20 is rotatable about an axis of rotation 14, also referred to as drilling axis. Through this a columnar structure 32 is produced which surrounds the bar-shaped foundation engineering tool 10.

(8) The ejected injection medium 22 penetrates up to a depth of propagation 28. The depth of propagation 28 is a radial distance that can be determined from the injection opening 20 or from the axis of rotation 14. Due to obstacles in the ground the extent of the depth of propagation 28 can depend on the azimuth angle around the axis of rotation 14 and/or on the height of the injection opening 20 along the axis of rotation 14.

(9) To measure the depth of propagation 28 a sensor means 40 is arranged in a co-rotating manner on the foundation engineering tool 10. This receives a measuring signal, for instance a sound signal. As sound signal the injection noise can be used or a transmitter can be employed to emit an acoustic signal, the reflections of which are measured as a sound signal by the sensor means 40. The signal can in particular be reverberated on a boundary surface between the injection medium 22 and the ground 3.

(10) For the ascertained depth of propagation 28 the related azimuthal direction is also ascertained that indicates a rotational position of the injection opening 20 around the axis of rotation 14. For this purpose, gyroscopic measuring means 30 can be provided on the bar-shaped foundation engineering tool 10. These record a direction of movement 26 of at least a part of the foundation engineering tool 10. This movement is caused by the ejection of the injection medium 22. Therefore, an ejecting direction 24 and the direction of movement 26 of the drill rod 10 are directly opposed to each other. This enables an electronic evaluation unit to calculate different ejecting or issuing directions 24 of the injection opening 20 from the measurement values of the gyroscopic measuring means 30. A correct rotational position can also be ascertained and recorded by recording the angle of rotation or a rotational speed on the basis of an initial rotational position.

(11) By preference, for a 360° rotation of the injection opening 20 several different issuing directions 24 are recorded successively with the gyroscopic measuring means 30 and the related depths of propagation 28 are forwarded to the evaluation unit. In this way, the dimensions of the columnar structure 32 formed in the ground can be ascertained at a high precision.

(12) In FIG. 2 a possible raw data curve is shown which is ascertained through sound measurement with the arrangement of FIG. 2. FIG. 2 shows, along a time axis t, the sound intensity I measured periodically per revolution which represents a measure of the depth of propagation of the injection medium 22 and therefore a measure of the external shape of the columnar structure 32 produced in the ground. The columnar structure 32 can in particular be a foundation pile in the ground 3.

(13) According to the invention the raw data curve which is of little explicitness at first hand is transferred to a helical time axis t illustrated schematically in FIG. 3. In this, the longitudinal axis s of the helical shape is a measure of the distance covered or the depth of the foundation engineering tool 10 in the ground 3. A 360° winding of the helical shape represents a 360° rotation of the foundation engineering tool 10 in operation, in which case the related axial distance s corresponds to a feeding motion of the foundation engineering tool 10 per revolution.

(14) The raw data curve according to FIG. 2, together with the sound value as a further processing parameter, can be transferred to the helical time axis t thus formed according to FIG. 3. From this, a columnar model 50 can be produced through simple mathematical interpolation according to FIG. 4 and displayed on a display means preferably located on the construction apparatus 100. The values for the sound intensity I can be plotted in a radial direction with respect to the longitudinal axis s so that a substantially cylindrical columnar shape is obtained. Due to deviations in the sound intensity it is possible to directly identify deviations in the columnar model 50 as dents 52 or dints and thus as possible defects in the produced foundation pile.