Drivable Device For Compacting A Soil Layer Structure And Method For Ascertaining A Layer Modulus Of Elasticity Of An Uppermost Layer Of This Soil Layer Structure

• US 20120134746A1
• Filed: 11/21/2011
• Published: 05/31/2012
• Est. Priority Date: 11/26/2010
• Status: Active Grant

• Current Assignee: Bomag GmbH (FAYAT SAS)
• Original Assignee: Bomag GmbH (FAYAT SAS)
• Inventors: Wallrath, Wolfgang, Kloubert, Hans-Josef
• Granted Patent: US 8,671,760 B2
• Time in Patent Office: Days
• US Class Current: 404/72
• CPC Class Codes: E01C 19/282 self-propelled, e.g. with an own traction-unit E01C19/285 - E01C19/288 take precedence
• CPC Class Codes: E01C 19/288 adapted for monitoring characteristics of the material being compacted, e.g. indicating resonant frequency, measuring degree of compaction, by measuring values, detectable on the roller; using detected values to control operation of the roller, e.g. automatic adjustment of vibration responsive to such measurements
• CPC Class Codes: E02D 1/022 by investigating mechanical properties of the soil E02D1/027 takes precedence
• CPC Class Codes: E02D 3/026 by rolling with rollers usable only for or specially adapted for soil compaction, e.g. sheepsfoot rollers rollers for soil working in agriculture A01B29/00; rollers for road paving, such rollers usable also for compacting soil E01C19/23
• CPC Class Codes: E02D 3/046 by tamping or vibrating, e.g. with auxiliary watering of the soil E02D3/026, E02D3/08 take precedence; generating or transmitting mechanical vibrations for performing mechanical work in general B06B; tamping or vibrating apparatus for working ballast or railways E01B27/00, for consolidating paving materials E01C19/30, for consolidating concrete in general E04G21/06

Abstract

The present invention relates to a drivable device for compacting a soil layer structure, having at least one vibration means or device, such as a vibration roller or a vibration plate, via which load pulses (P), which compact the soil layer structure, can be introduced into at least one load introduction area. At least one first and one second detection means or devices for detecting the modulus of elasticity of the soil layer structure are provided, which are situated spaced apart from one another on the drivable device in such a way that the first detection means or device allows a detection in the load introduction area and at least the second detection means or devices allows a detection outside the load introduction area. The present invention also relates to a method for ascertaining a layer modulus of elasticity.

Claims

1. A drivable device for compacting a soil layer structure, comprising:

at least one vibration device configured to introduce load pulses (P) into at least one load introduction area for compacting the soil layer structure; and

at least one first and one second detection devices for detecting the modulus of elasticity of the soil layer structure, wherein the first and second detection devices are situated spaced apart from one another on the drivable device in such a way that the first detection device allows a detection in the load introduction area and the second detection device allows a detection outside the load introduction area.

2. The drivable device according to claim 1, wherein the first detection device is configured to allow a detection of a first value w₁ of a depression trough of the soil layer structure in the load introduction area, and the second detection device is configured to allow a detection of a second value w₂ of the depression trough outside the load introduction area.

3. The drivable device according to claim 1, wherein the first and/or the second detection devices each has at least one geophone configured to detect reflected waves as a result of the load pulses (P) introduced into the soil layer structure.

4. The drivable device according to claim 1, wherein the first detection device is situated on the drivable device so as to allow a detection in a load center (Z) of the load introduction area.

5. The drivable device according to claim 11, wherein the vibration device is a vibration roller having a bearing unit and a vibrating drum, and further wherein the first detection device is situated on one of the bearing unit or the vibrating drum of the vibration roller.

6. The drivable device according to claim 12, wherein at least the second detection device is situated on one of the bearing unit or the static drum of the static roller.

7. The drivable device according to claim 1, wherein at least the second detection device is situated so as to be displaceable in its position relative to the load introduction area.

8. The drivable device according to claim 1, wherein the drivable device is implemented as a compactor having a vibration roller and at least one static roller.

11. The drivable device of claim 1, wherein the at least one vibration device comprises at least one of a vibration roller or a vibration plate.

12. The drivable device of claim 1, further comprising at least one static roller having a bearing unit and a static drum.

13. The drivable device of claim 1, further comprising a support frame, wherein at least the second detection device is situated so as to be displaceable, via the support frame, in its position relative to the load introduction area.

9. A method for ascertaining a layer modulus of elasticity of a layer of a soil layer structure during a soil compaction procedure, comprising:

introducing at least one load pulse (P) into a load introduction area via a surface of an uppermost layer of the soil layer structure;

detecting a first value (w₁) of a depression trough of the soil layer structure in the load introduction area via a first detection device,

ascertaining an equivalent modulus of the soil layer structure from the detected first value (w₁) of the depression trough;

detecting a second value (w₂) of the depression trough outside the load introduction area via a second detection device,

ascertaining a bedding modulus of the soil layer structure from the detected second value (w₂) of the depression trough;

ascertaining the layer modulus of elasticity of the uppermost layer of the soil layer structure from the two detected values (w₁, w₂) of the depression trough and the ascertained equivalent modulus or the bedding modulus,

wherein the load pulse (P) is introduced via a vibration device of a soil compaction machine into the soil layer structure.

10. The method according to claim 9, wherein the detection of the first and second values (w₁, w₂) is performed during a soil compaction procedure of the soil layer structure.

14. The method of claim 9, wherein the layer of the soil layer structure is a roadway asphalt layer.

15. The method of claim 9, wherein the vibration device comprises at least one of a vibration roller or a vibration plate.