Ground drilling device, method for the production and use thereof

{
  "publication_number": "US11268324B2",
  "country": "US",
  "kind": "B2",
  "title": "Ground drilling device, method for the production and use thereof",
  "abstract": "A ground drilling device with a percussion piston for drilling into the soil, comprising at least one housing section for the percussion piston, wherein an insert is arranged in the housing between the drilling head tip and the percussion piston such that the insert transmits at least a portion of the energy of the percussion piston to the housing, and the insert is held in the housing by means of a shrinking adhesion connection.",
  "claims": [
    "1. Ground drilling device having a percussion piston for drilling into the soil, comprising at least one steel housing for the percussion piston, and a steel insert arranged in a section of the housing between a drilling head tip and the percussion piston such that the insert transmits at least a portion of the energy of the percussion piston to the housing, wherein the insert is held in the housing by a shrinking adhesion connection.",
    "2. Ground drilling device according to claim 1, wherein the section in which the insert is arranged has a circular diameter.",
    "3. Ground drilling device according to claim 1, wherein the shrinking adhesion connection includes an anaerobic adhesive.",
    "4. Ground drilling device according to claim 1, wherein the insert is part of a front drilling head housing.",
    "5. The ground drilling device of claim 1, wherein the insert is arranged around an adjacent end of the drilling head tip that is configured to be directly impacted by the percussion piston when the percussion piston is driven in the forward direction.",
    "6. The ground drilling device of claim 1, wherein the insert is arranged forward of a shoulder defined at one end by an anvil end of the drilling head tip, the shoulder configured to directly impact the insert.",
    "7. The ground drilling device of claim 1, wherein: the housing section has an internal contour, wherein, when the housing section and the insert are at the same temperature, and the insert is external to the housing section, the internal contour of the housing section is smaller than an outer contour of the insert.",
    "8. The ground drilling device of claim 1, wherein the shrinking adhesion connection comprises a connection formed by heating the housing at a temperature between 250° C.−350° C.",
    "9. The ground drilling device of claim 1, wherein the shrinking adhesion connection between the insert and the housing is configured to be released upon application of heat to the housing above a temperature at which an adhesive of the shrinking adhesion connection loses adhesion to facilitate removal of the insert from the housing.",
    "10. The ground drilling device of claim 9, wherein the adhesive is configured to act as a lubricant to facilitate disassembly when the heat is applied to the housing above the temperature at which an adhesive of the shrinking adhesion connection loses adhesion.",
    "11. Method for producing a ground drilling device having a percussion piston for drilling into the soil, comprising: arranging an insert in a housing between a drilling head and the percussion piston such that the insert transmits at least a portion of the energy of the percussion piston to the housing, wherein a shrinking adhesion connection is produced between the insert and the housing, the producing of the shrinking adhesion connection comprising heating the housing at a temperature between 250° C. and 350° C.",
    "12. Method according to claim 11, wherein an anaerobic adhesive is the adhesive applied to the insert.",
    "13. Method according to claim 11, wherein the insert is held substantially at room temperature when installing the insert in the housing.",
    "14. The method of claim 11, wherein the shrinking adhesion connection further comprises applying adhesive to an exterior of the insert before arranging the insert in the housing, the insert being arranged in the housing after the housing has been heated to the temperature between 250° C.−350° C."
  ],
  "description_excerpt": "The invention relates to a ground drilling device, a method for producing a ground drilling device, and use of a joining process for the joining of an insert.\n\nGround drilling devices in the form of percussion drilling devices are known in the prior art and are used in particular for the production of horizontal earth boreholes. Percussion drilling devices are self-propelled drilling devices. Generally, such a percussion drilling device comprises a percussion piston, which is moved in oscillating manner (back and forth) inside a housing and thereby strikes against a front or rear impact surface of the housing, depending on the desired direction of movement of the percussion drilling device. The kinetic energy of the percussion piston which is transmitted in this way ensures an accelerating of the percussion drilling device within the soil.\n\nSuch a percussion drilling device is known for example from DE 10 2009 038 383 A1. The housing of the percussion drilling device known from DE 10 2009 038 383 A1 is made of two parts. In one part, i.e., the rear part, the percussion piston performs its oscillation. The other part, i.e., the front part, comprises the drilling head and is impacted by the percussion piston. The two parts are joined together by friction welding. Usually the rear part is a pipe made of structural steel, having a predetermined inner diameter for the production of a housing section of a percussion drilling device. The front part is usually made from a solid block and consists of high-quality steel, since the forces of the percussion piston are acting [on it].",
  "cpc": [
    "E21B 4/145",
    "F16B 11/008"
  ],
  "ipc": [
    "E21B 4/14",
    "F16B 11/00"
  ],
  "assignees": [
    "Tracto Technik GmbH and Co KG"
  ],
  "inventors": [
    "Franz-Josef Puttmann"
  ],
  "filing_date": "2018-06-20",
  "publication_date": "2022-03-08",
  "grant_date": "2022-03-08",
  "priority_date": "2017-06-20",
  "application_number": "US-201816624515-A",
  "family_id": "62873299",
  "cited_by_count": 0,
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}