DE3941081A1 - System involving lost rock drills and probes - employs drill of appropriate dia. with lateral slots for expulsion of drilled-out material - Google Patents

Abstract

The equipment involves a specially hardened point screwed on to the end of a tube by means of a fine thread. The tube is fitted with a conical cover on its upper side, and at the upper end of the cover is an accommodation for a correspondingly threaded striker and ramming device. A clamp and pick-up device can be fitted to the equipment which will take hold of lost drilling and splitting tools, and remove them from the ground. USE/ADVANTAGE - For rock drilling work, to recover lost drilling and splitting tools from bore holes, using equipment which is compatible to any known type of drilling gear.

Description

The invention relates to a complete drilling and recovery unit for torn and thus "lost" drilling and probing device according to the preamble of claim 1 (plus the preamble of Claim 2).

System-specific information

The invention serves in particular to recover "lost" drilling and probes from depths from which a manual salvage not possible or only with large and therefore uneconomical Workload is to be performed.

The invention consists of the following units:

• 1) Suitable for over-drilling device with a suitable diameter for this purpose, which is provided on the side with slots that are used to remove the drilled material. (see elongated holes in Fig. 2).
  The device contains a specially hardened tip Fig. 4, which can be screwed onto the lower end of tube Fig. 2 by means of a fine thread . The tube named with Fig. 2 is provided on the upper side with a screwable conical cover Fig. 5, the one at the upper end Has holder for an impact equipped with a corresponding thread and driving device.
• 2) Catch and recovery device:
  Fig. 4 is basically interchangeable with the claim described below and claimed according to claim 1. It consists of a specially hardened outside cylindrical and inside conical outside cage Fig. 7 and a hollow cone Fig. 8 made according to fig . The device Fig. 7 includes a clamping device between Fig. 8 and the probe rod to be recovered. The clamping device is held under slight pretension, which enables unimpeded entry of the boring bar to be recovered into the interior of the hollow cone from below. When there is a tensile load (ie due to the forces involved in the rescue), the clamping effect occurs mechanically, which only acts in the direction of pull and increases with increasing pulling force.

Fig. 1 shows the overall view for clarification

Current state of the art

With previously available provisional catch and recovery devices it was not or hardly possible, lost drilling and probing equipment to recover. For commercial reasons, there was still something torn down So far, drill or probe rods in the underground. Although such Sounding material represents a not insignificant material value, elaborate salvage was not considered because it unreasonably disproportionately high costs. Existing legislation has been consistently referred to disregarded a required salvage.

Problem

Results from drilling and sounding problems caused by torn and defective drilling and Sounding devices. This raised the question of a construction the following requirements are met:

• - light weight
• - easy to use
• - must be fully compatible with all existing drilling equipment
• - good economic viability

solution

The solution by the invention is not complex (i.e. economical) easy to carry and manageable Recovery unit that is possible even for inexperienced workers makes rescue operations quick and easy on site. The advantages of the invention are:

• 1) Possible salvage of drilling previously considered "lost" and probing device of considerable value.
• 2) Preservation of the old borehole and thus avoidance of one necessary new drilling, which is associated with additional costs is.
• 3) No unnecessary provision of additional drilling and Probe device, since salvaged device can be reused.
• 4) Avoiding legal difficulties in the event of non-recovery "lost" equipment.
• 5) Drilling and probing can be much cheaper be carried out because the loss of drilling and probing device costs incurred with a new price calculation largely eliminated as a risk from the side of the executing entrepreneur is largely excluded.

Claims (2)

1. General term:
Drilling and recovery of "lost" drilling equipment in the underground, eg. B. in drilling and exploratory work for soil, contaminated sites and other exploration studies.
Characteristic part:
Can be characterized in that taken after previous over-drilling by means of the mentioned in claim 1 the device by a catching and clamping device lost drilling and logging tool and pulled through suitable devices for this purpose from the underground 2. General term:
Fully compatible with interchangeable, specially hardened drill bit with a catching and recovery device named in claim 1.
Characteristic part:
Characterized in that the drilling tip mentioned in sub-claim 1 with a thread specially suitable for this purpose is to be exchanged unmistakably with the catching and recovery device mentioned in claim 1.