DE102005022585A1 - Boring header for ventilation lance, has connector opening and discharge opening, where fluid channel provided between connector opening and discharge opening runs through drill bit and boring shaft - Google Patents

Abstract

The header has a connector opening and a discharge opening and a fluid channel is provided between the connector opening and the discharge opening. A boring operation is performed during soil reorganisation of soil contaminated due to firmly stored sand and/or gravel. The fluid channel runs through a drill bit (64) with a connecting threaded hole and a boring shaft, and a valve seat is provided in the boring shaft. Independent claims are also included for the following: (A) a ventilation lance comprising a self-probing drill bit (B) a method for using a boring injection armature.

Description

The The invention relates to a drill attachment, in particular for a ventilation lance, wherein the drill attachment a connection opening and at least one outlet opening for a fluid and between the connection opening and the outlet opening a fluid channel is provided.

One Such drill attachment is known, for example, from DE-A1 101 06 695. The content of this patent application is hereby incorporated in full incorporated the disclosure of the present invention, also to the Purpose, from which features in claims to include the present invention. This drill attachment is, but what for the subject of the present invention as not explained below is necessary, housing one piece as a drill bit for formed a drill or injection anchor. For the purpose of their screw mounting has the known drill bit at the foot, this means facing away from the drill bit tip, a central, axially aligned Threaded hole on. From the end face of the fluid channel goes out, extending up to several in a cutting section of the drill attachment Branched between cutting elements outlet openings branches. In the Tapping can be a drill or injection anchor with a matching external thread and central feed channel be screwed. When screwed in, the feed channel goes in the fluid channel over. This way, while or after drilling, for example, a rinsing liquid or a grout, such as cement paste, introduced through the drill bit into the wellbore in which the drill bit after compression as a lost component remains. Another drill attachment of the type in question is from DE-A1 197 12 181 known. The content of this patent application is hereby incorporated in full in the disclosure of the present invention Also included for the purpose of providing features thereof Include invention. Also known from this Bohrvorsatz is housing one piece as Drill bit for a drilling or Injection anchor procure and is like the drill bit mentioned above for flushing of drilling fluid or for injecting an injection mass into the well suitable. After pressing into the borehole, the grout cures, whereby u. a. also the fluid channel and the outlet openings be permanently closed.

in the With regard to the above-described prior art is the present Invention the task is based, a drill attachment of the aforementioned To improve kind of use advantageous, so that in particular a allows more versatile use becomes.

This object is achieved in the context of the invention initially and essentially by the fact that the drill attachment has a non-return valve acting on the fluid channel, the blocking direction of which points in the direction from the outlet opening to the connection opening. The connection opening lies in a connection region of the drill attachment opposite the drill bit of the drill attachment, which is suitable for connecting the drill attachment to a ventilation lance or the like with a mating thread suitable for this purpose by means of, for example, external or internal threads. The proposed solution makes it possible for the drill attachment according to the invention to be attached to a feed duct, in particular anchor pipe, after drilling into the ground there without the risk that it will escape from the ground to a return flow of, for example, gas, liquid or soil in whose interior can come. Depending on the application, this is important not only if the hole has already been completed, but also if, for creating deeper holes or so-called deep holes, the drill may even break several times in the event of interruption of the drilling process and rear connection of inlet or anchor tubes must be extended. In particular, the drill bit according to the invention by the proposed check valve is also suitable for holes in which the feed channel and the outlet openings are deliberately not closed by a Verpressmittel such as cement paste, but after drilling without the said risk of penetration of gas, liquid or soil to take over another function. Additional fields of application thus also result in the area of soil remediation, on the one hand already during the sampling (for example the erection of soil air measuring points) and on the other hand preferably also during the soil regeneration. In this context, the drill attachment according to the invention may be part of a self-drilling ventilation lance, by means of the airborne or other suitable fluid is introduced by the drill attachment from the bottom surface in deeper, preferably below contaminated soil areas layers. The drilling can also be done here with a rinsing liquid, but then after completion of the bore no compression of the outlet openings occlusive Verpressmittels (eg. Cement glue), but possibly even over a period of several years, the introduction of, for example, air into the ground. Especially in connection with the cleaning of contaminated soils is of great importance that through the check valve according to the invention, a return flow of soil gas, polluted groundwater or contaminated soil in the Drill attachment and the attached drill is prevented. According to the invention, contrary to the selected reverse direction, it is possible to introduce a fluid, ie gas or liquid, through the feed channel of the drill, the fluid channel and the outlet openings of the drill attachment into the soil. Apart from that, however, the drill bit according to the invention is also suitable, for example, for use on drilling or injection anchors and the like.

According to a preferred embodiment may be provided as a check valve, a spring check valve having a valve body, with respect to the fluid channel with resulting pressurization in the direction of the outlet opening to the connection opening and in particular at fluid pressure equalization between the fluid channel and outlet openings in a Verschließstellung and which at a certain resulting Pressurization is in the direction of the connection opening to the outlet opening in an open position. This means that the valve body is in a closed position when the resulting compressive force due to spring action or spring action in combination with pressure from downhole gas, liquid or soil is greater than the opposing resultant compressive force due to pressure prevailing within the drill head interior , in particular a pressure in a gas or liquid to be supplied to the borehole. On the other hand, the check valve can be converted in reverse pressure ratios from exceeding a certain opening pressure in an open position in which the supply of fluid from the interior of the drill bit can be made in the borehole. This opening pressure may be appropriate by appropriate vote of the spring action of the check valve slightly above the outlet pressure applied, preferably to about 1 bar above this pressure, are. It is expedient if the dimensioning of the valve spring is adapted to the fact that the check valve on the one hand reliably closes when pressure equalization between the outlet opening and port or back pressure, but on the other hand opens at an already low excess pressure in the feed direction of the fluid through the Bohrvorsatz. This is also of particular importance with regard to the explained possible use of a ventilation lance, since it may be necessary to pump air for several years against the opening pressure, ie the energy consumption depends decisively on this. The at least one or a plurality of outlet openings may expediently be provided in a cutting section of the drill attachment equipped with cutting edges, in particular with attached carbide cutters. This allows that when drilling with a drilling or rinsing liquid effective comminution of the soil and removal takes place from the immediate area of the cutting. It is preferred that the geometry of the drill bit or the drill bit, in particular the arrangement and shape of cutting present thereon, adapted to that during drilling results in at least predominantly lateral displacement of drill cuttings. This means that the cuttings are not or only slightly promoted in the direction of the borehole mouth, ie in particular the risk of promoting contaminated soil to the surface is largely avoided. With respect to the check valve is also preferred that it has a valve spring and a particular conically tapered in the direction of the connection opening valve seat, against which the valve body, in particular a ball, a cone or the like, is pressed by the valve spring. It is further preferred that the valve ball and valve spring made of a stainless material, such as, stainless steel exists. An expedient development is also possible in that a cylinder compression spring is provided as the valve spring, which is held centered by an engaging into its cylinder cavity spring bolt, which is supported in a provided with annular projection longitudinal bore of the drill bit. The advantage here is that the cylinder compression spring is also aligned by the spring bolt in the desired spring force direction when the fluid channel in the region of the spring receiving example. Expands or branches, so that even then a reliable valve function is guaranteed. Alternatively or in combination with the aforementioned features, there is the possibility that the drill attachment is designed in two or more parts in terms of its housing either in one piece or in particular with regard to a simplified installation of the check valve. Preferably, a solution is envisaged, according to which the drill attachment as a two-part housing has a drill bit with a connection threaded bore and a drill shank which can be screwed therein, through which the fluid channel runs in the middle, the valve seat on the drill shank, in particular on a sleeve which can be inserted into an end bore of the drill shank , formed and the resilient support of the valve body is provided against the drill bit. This means that in initially separate state, the components of the check valve used in appropriate or adapted recordings of the drill bit and the drill shank and the two aforementioned components of Bohrvorsatzes can then be screwed, the check valve or the desired valve function automatically obtained in bolted state becomes. It is useful if when screwing between associated wall sections of drill bit and drill shank in a defined screwing the further screwing preventing stop is formed, its position or associated screwing to a certain desired opening pressure of the check valve is fit. Such a stop may, for example, be formed by an end face of the connecting threaded bore in the drill bit in cooperation with the end face of the drill shaft. In continuation of the idea, there is the possibility that such a screw-in stop is adjustable, for example. By spacers defined strength, threaded pins or the like, to allow adjustment or adjustment of the opening pressure of the check valve to different requirements. The said drill stem may preferably be an anchor tube, also referred to as a ground nail, which has an external thread on the outer casing, at least in the region of one longitudinal end, preferably at both longitudinal ends or in the longitudinal direction. The external thread can serve for screwing into the front, the cutting-bearing housing part of the drill attachment or, depending on use, for screwing on a supply or anchor tube of a ventilation lance or, for example, a drill or injection anchor by means of a coupling sleeve. Starting from a conventional tube or anchor tube can be introduced in the at least one end face said receptacle, preferably as an end bore, for holding the valve seat sleeve. As an alternative to the housing-part design, ie, for example, from a drill bit as a front and a drill shank or beginner anchor as a rear component formed embodiment, the drill bit according to the invention may also be integrally formed in the form of a drill bit, without a connected thereto shank portion co-component of Bohrvorsatzes would be , Such an integral embodiment is, for example, possible in the form that the check valve is possibly taken up with an insertion or adapter part alone in a receptacle, for example. In a frontal bore, the drill bit and held therein. In such an integral embodiment of the drilling attachment as a drill bit, the drill bit can have a foot with a connection threaded bore and the fluid channel and the check valve lie between the connection bore and the at least one outlet opening. The blocking direction of the check valve points again in the direction of the outlet opening to the connection opening of the drill attachment, which then coincides with the connection threaded bore of the drill bit or its inlet opening.

alternative or in combination with the aforementioned features, the fluid channel have a branch, from the fluid holes leading to an outlet opening, in particular two or three fluid bores, branch off, wherein the check valve adapted to synchronize the branches, in particular evenly, to interact. In particular, you can while two fluid holes in a common plane to a longitudinal symmetry line symmetrically sideways branch off, wherein within such a branching plane to the other Design various other options exist. First is intended to a junction, in which the direction of the laterally branching Fluid holes with respect to the drilling feed direction obliquely forward has, preferably including a branch angle between the longitudinal symmetry line and the direction of fluid drilling from 30 to 60 degrees, more preferably from about 45 degrees. this leads to In addition, when drilling in the purge stream (For example, of water) with respect to the Bohrvorschubrichtung directed obliquely forward is. Such alignment supports that of the cutting edges in the borehole separated soil first in the effective range of cutting is held where he continues to crush and then instead of one backward promotion from the borehole laterally displace from the drill attachment. This is particularly advantageous in the mentioned soil remediation, where the contaminated soil in the borehole is not up promoted may be. When at an angle forward oriented outlets is surprising that they also show only a slight tendency to blockage. Alternatively, it is possible to that the direction of the laterally branching fluid bore with respect to Drilling direction obliquely rear, preferably including a branch angle between the longitudinal symmetry line and the direction of fluid drilling from about 30 to about 60 degrees. Depending on Soil type can cause constipation due to this measure from outlet openings and their damage be further reduced. Deviating from these possibilities or in addition Also, a fluid bore may extend from the branch in the longitudinal direction extend to a centrally located at the Bohrkronenspitze exit port. In this context, the spring bolt can be made hollow in the longitudinal direction and against an annular projection of this, thus assuming a dual function Fluid bore supported be.

According to a further expedient embodiment may be provided as a drill bit a stepped drill bit, in which chisel tip-like, aligned at a radial, arranged symmetrically to a central axis carbide cutting elements are arranged at different stages of different radial extent. By itself taken from DE A1 101 06 695 known stage arrangement of the cutting elements is achieved particularly in combination with forward-looking outlet openings the advantage that the soil can be crushed and displaced to a great extent, ie in the well a promotion upwards or to the mouth is avoided. Here it is further preferred that a connecting line of the radially outer ends of the cutting elements with the longitudinal direction forms an angle of 30 to 70 degrees and / or that the Cutting elements are arranged offset in their radial alignment with respect to the cutting elements of a longitudinal or subsequent stage by 45 degrees. For further preferred features and their effects, reference is made to the aforementioned document incorporated into the disclosure of the invention.

Especially in conjunction with a rearward orientation from outlet openings It is further preferred that the drill bit at least one the drill bit radially superior Having drill bit wings, like this for taken in DE A1 197 12 188 is explained in more detail. Also exists the Possibility, that two drill bit wings circumferentially spaced are formed and that these Bohrkronenflügel a different radial Have extension. To further preferred embodiments and The resulting effects in this context are on the last mentioned in the disclosure of the invention with incorporated document directed. To a possibly after drilling possibly desired later removal of the drill bit bspw. on a ventilation lance from the ground can facilitate acting on the drill attachment counter to the drilling feed direction, or against this direction freestanding cutting be present. This makes possible, that the drill even after one, depending on the application may even desired, Invasion of the initial Borehole annular gap under continuous rotation back out again pull out the borehole. From This is an advantage especially in soil remediation, according to their Complete the drills used for this, especially ventilation lances, should be removed from the cleaned soil again. Finally, can be advantageous in this, but also in other context that provided at the outlet openings jet nozzles are. The exit spray jet can thereby be varied in its direction and form and thereby its aforementioned possible effects be further influenced. A drill bit or a drill bit after one or more of the features described above preferably as a head part on a ventilation lance, the desired number having on supply pipes, in particular for venting contaminated soil, be provided so that the outlet openings for air located at the headboard.

The Drilling can preferably be carried out with continuous supply of a rinsing agent through the drill attachment in the hole, whereupon after completion the hole through the ventilation lance over the ground a desired one Period of air or other desired fluid, d. H. if necessary also a liquid, supplied can be. When the ventilation lance is the foremost segment in the drilling direction, d. H. as a headboard, the drill bit described with a check valve is provided, prevents a bottom gas, a ground fluid or Soil components in the ventilation lance invade and ascend into it. Given the versatile possible use may also be spoken of an injection lance in such a device become. To further, in conjunction with a drill bit according to the invention on a ventilation lance for the remediation of contaminated soil resulting advantages to the preceding description. An appropriate training the ventilation lance is thereby possible that as supply pipes anchor rods, in particular per se known so-called soil nails, with a longitudinal direction continuous outer shell thread are provided, which can be screwed by means of the threaded ends Coupling sleeves with each other are connectable. If the drill bit is a drill bit and a drill shank may, as such, for example, one with the drill bit to the recording the check valve adapted anchor rod with corresponding external thread for connection to the supply pipes may be provided by means of coupling sleeve. Regarding of the outer shell thread is preferably to a coarse thread, for example, a trapezoidal thread thought. The external thread can on the preferred of cold rolling or fine grain structural steel existing Supply pipes rolled or other appropriate way be prepared. The coupling sleeves are provided with matching internal thread and preferably have longitudinal in the middle of it a rotation stop. Depending on the configuration, the Anchor rods alternatively directly into a threaded connection hole the Bohrvorsatzes be screwed. The supply pipes can, for example. a manageable length each of 3 meters (but also different) and with more Supply pipes and coupling sleeves considerably extended be, so that deep wells (for example, 10 to 30 meters Depth) to below deep impurities are possible. Especially in In this context, a production of pipes from cold rolling or Fine grain structural steel in terms of combined toughness and strength of advantage, as this particularly large drilling depths can be reached. After all It is preferred that at least one supply pipe to at least one End of a thread, especially an internal thread, for connecting a Pressure fitting has. This serves to either when drilling a rinsing liquid, For example, water, through the ventilation lance into the borehole and / or later to penetrate through the borehole ventilation lance Air or another desired For example, to feed medium into deeper soil layers. Depending on the selected medium can also seal the coupling sleeves, for example. With sealing rings, preferably O-rings, be advantageous.

The Invention relates independently also the use of a drill attachment, which has a connection opening and at least one outlet opening for a fluid wherein between the connection opening and the at least one Outlet opening Fluid channel is provided, and the drill bit on the fluid channel acting check valve has, the reverse direction in the direction of the outlet opening to the connection opening has.

The prior art is first on DE 19702749 A1 directed. The application described therein relates to a method for setting a Injektionsbohrankers with the objective to anchor the injection drill anchors in the ground in an anchoring body consisting of Verpresserungskörper and to make the design of this anchoring body controllable. It is proposed to flush the anchor during drilling with flushing medium to flush dissolved cuttings towards the well mouth and, when the well reaches its final depth, to fill a grout such as a mortar suspension or resin into the well and then one more Post-compression by means of distributed along the armature Verpressventilen make. In the known use, the anchor outlet openings and the borehole annular gap are thus closed by the grout. Out DE 2810892 C2 For example, a method and an apparatus for ventilating a compost rental are known. For this purpose, vertical ventilation lances, at the top of a tuyere is provided, stab in the rent.

In front In this background, the invention is based on the object further advantageous use of said generic drill attachment specify.

To solve the invention proposes the use of said Bohrvorsatzes in the regeneration or soil remediation of contaminated soil, in particular of solidly stored eg. Gravel and / or sand-containing soil before, in which use the soil after completion of a hole produced by means of Bohrvorsatzes the drill bit gas, in particular air, is supplied. Unlike the off DE 2810892 known ventilation lance and so-called filter tubes with flushing tip, which can be flushed by high pressure flushing under its own weight to a limited depth in certain soils, the drill bit used according to the invention, which can be provided to achieve a drilling action with cutting, drilled or the like, or .A equipped with such a drill attachment and thus self-drilling ventilation lance by means of a well known drilling and injection anchors drill even in fixed floors and even to greater depths directly, ie without prior piping (casing) time and cost savings in only one operation be drilled.

Appropriate, d. H. Preferred developments of the use are in the on claim 1 referring back claims in this respect resulting effects and benefits as well as even more possibilities the embodiment referred to the preceding description becomes. Of importance for the specified use is that the drill bit or the drill bit and a ventilation lance equipped therewith in the sense of the invention self-drilling, d. H. with a conventional drill drive, the bspw. performs a rotating or rotary-driving drive, immediately in soils most diverse, d. H. also fixed, soil types can be introduced is. A self-drilling drill bit or drill bit in this sense is preferably adapted to that when drilling a predominantly lateral displacement results from cuttings. The adaptation can for example in it lie that the direction branch off from the side of the fluid channel Fluid holes with respect the drilling feed direction points obliquely in front and / or in it, that the geometry, in particular the arrangement form of the drill bit or the drill attachment provided cutting, adapted to that when drilling the desired lateral displacement results. As a ventilation lance immediately a correspondingly adapted to the headboard drill pipe is used, it comes, especially for small cross-sectional dimensions, in the described Selbstbohrtechnik practically no discharge of contaminated soil from the well, which means for the performers that eg. no special protective suits necessary are and high productivity becomes possible. If the Bohrvor sentence or the ventilation lance equipped with it when drilling up to a desired Drilling depth, which is above the maximum at the relevant hole reached drilling depth, for the supply of the Bohrungsringspalt sealing support fluid, in particular from a bentonite-containing or from bentonite supporting liquid, is used, a comparable to a labyrinth seal Sealing against ascending, possibly contaminated in the borehole Gas, formed and at the same time a desired shear bond between Borehole wall and the thread ribs of the self-drilling ventilation lance educated.

The invention also relates to the use of a Bohrinjektionsankers, wherein the Bohrinjektionsanker comprises a self-drilling drill bit and at least one anchor rod, wherein the anchor rod has a longitudinally extending inner channel which merges into a cavity formed in the drill bit and provided with at least one outlet opening. Conventionally who the Bohrinjektionsanker used for embedding in the borehole by means of an injected grout. Starting from such a Bohrinjektionsanker the invention has for its object to provide a further advantageous use.

The object is achieved according to the invention initially and essentially by using the Bohrinjektionsankers as a ventilation lance, in particular for ventilation of contaminated soil, the ventilation lance is first used to drill to a desired first depth of the drill bit in the ground, the ventilation lance then in particular when drilling to a larger second drilling depth, for supplying a rinsing liquid, in particular water, is used in the bore and wherein the ventilation lance after drilling for injecting compressed air through a present in the inner channel of the ventilation lance Spülmittelsäule, especially water column through into the ground. Also in this context, a so-called. Self-drilling drill bit or a self-drilling Bohrinjektionsanker understood such that can bring directly to a conventional rotary or rotary beating drill drive in a variety, ie also in solid, floors to large drilling depths , without, for example, a previous Verrohrrung the bore (so-called. Casing) would be necessary. A special feature of the proposed use is that the water column formed during the supply of the rinsing liquid (for example water) in the inner channel of the ventilation lance (also referred to as water mask) during the subsequent soil ventilation through the ventilation lance by the pressure of the water column no contaminated soil or gas penetrates into the ventilation lance, so that for this purpose on the drill bit no separate check valve is required. It is sufficient if the rinsing liquid is switched on only after reaching a certain drilling depth, which may be either a few meters above or even in the range of the final drilling depth. It is thus avoided over an already initial coolant supply, that it comes to the undesirable flushing of possibly contaminated soil from the bore. Another special feature of the use is that the opposite of the free, ie the drill bit, end of the ventilation lance compressed air injected into its inner channel at sufficient pressure practically independently passes through the water mask to the drill bit, so that there in the desired manner through the outlet openings escapes into the ground. It is sufficient that the air is introduced at a pressure which is greater than the dependent on the height of the water column water pressure. Depending on the type of soil, the flushing agent supply can also be used to widen the hole slightly in its deepest section or to loosen the transition to the adjacent soil through the loosened cuttings, so that the air leaving the drill bit can penetrate better into the soil. If the outlet openings of the drill bit, for example, after prolonged shutdown of the compressed air should be set, they are automatically flushed free at a later connection of compressed air through the then "shot" water. Said outlet openings on the drill bit fulfill a dual function in that they serve in the claimed use both for the supply of detergent and then of air (or other gas). In the case of the use according to the invention, it is preferred that the ventilation lance during drilling be used up to the first boring depth of the drill bit for supplying support liquid sealing the bore ring gap, in particular for supplying a bentonite-containing or bentonite supporting liquid. The support liquid can be either from the beginning of drilling or from a later date to the said first drilling depth of the drill bit, in which the supply is switched to rinsing liquid, either. By the support liquid, for example. Bentonite, the annular gap between the self-drilling ventilation lance and the loosened, contaminated soil is sealed against a later rising fumigation. The self-drilling aeration lance also offers the advantage of direct drilling in with the support liquid (ie without additional external casing or casing) so that no contaminated soil or contaminated gases are released during drilling and therefore special occupational safety measures are not required. As a vent lance a Bohrinjektionsanker described structure can be used, wherein a drill bit is preferred, the outer contour, in particular their cutting geometry and / or orientation of the outlet openings for the fluid, adapted to a drilling operation with at least predominantly lateral displacement of the soil or dissolved cuttings is. This assists that as boring as possible no contaminated soil is conveyed through the bore to the surface. Suitable, for example, a cross drill bit or a so-called. Stepped drill bit, wherein the respective outer diameter is preferably only slightly larger than the outer diameter of the anchor rods and wherein the Bohrkronenumfang preferably two opposing de outlet openings. Depending on the desired drilling depth, the ventilation lance can have a plurality of preferably provided with continuous external thread and inner channel anchor rods which are connected by means of coupling nuts which have matching internal thread in such a way that the inner channel over the entire length of the lance to extends to the outlet openings. A continuous anchor outer In addition to allowing the anchor rods to be cut to length, winch forms with the surrounding bentonite a particularly effective seal of the borehole which is comparable to a labyrinth seal and also makes possible a shear connection between the ventilation lance and the surrounding ground. If the supply is switched from support to rinsing liquid in the manner described, the inner duct running in the ventilation lance and its outlet openings at the drill bit are also rinsed free, so that the described supply of a gas (preferably air) into the ground can take place unhindered. The ventilation time can be on the order of days, weeks, months or even years depending on the requirements. The invention also includes a method according to the invention using a Bohrinjektionsankers, in which method may also be implemented one or more of the features described above for the further development of the inventive use and below. Thus, for example, after use and also after the method is preferred that after drilling on the drill bit opposite free end a cap is screwed so that the liquid column formed in the inner channel of the ventilation lance from the rinsing liquid, in particular the water column formed, can not flow unhindered because of the otherwise formed negative pressure, ie at least partially retained. Preferably, an end cap may be used having an internally threaded mounting bore for screwing onto an externally threaded anchor rod at the free end of the vent lance, further comprising a fluid port for connection to a fluid source (such as a compressed air line), a fluid passage connecting the fluid port and the mounting bore connects to each other, and a check valve whose passage direction is directed from the fluid port to the mounting hole and the locking direction of the mounting hole to the fluid port. The check valve may have, for example, a spring-loaded valve body, wherein the strength of the spring load depending on the embodiment, for example, by an adjusting screw or the like may be adjustable. Moreover, it is preferred that a through hole is provided on the end cap, which extends from the mounting hole to a opposite to the housing, releasably closable with a closure element (such as a screw plug) mouth, and that the check valve in a branched off from the through hole Bore is arranged. If the closure cap with a closed opening and with a closed non-return valve is screwed onto the free end of the ventilation lance after drilling in with flushing liquid and the separation of the known drive and fluid supply device, this causes the inner supply channel to above the flushing liquid in the supply channel or water mask is hermetically sealed, so that the flushing liquid or water mask can not flow through the outlet openings of the drill bit, but is held for a desired period. After screwing the venting lance can be used to press in, for example, compressed air from a supply device connected to the fluid connection through the end cap and through the present in the inner channel of the ventilation lance Spülmittel- or- water column through, the air pressure is adjusted so that the supplied air exceeds the blocking pressure of the check valve and the pressure of standing in the ventilation lance liquid or water column. The check valve opens to supply compressed air when the air pressure exceeds the valve lock pressure and ensures that there is always a slight overpressure after connecting the compressed air line in the ventilation lance above the water column. In order to be able to press air through the liquid or water column when the valve is open, the supply pressure in the ventilation lance must be greater than the liquid pressure dependent on the height of the liquid column. For example, in the case of a water column of 20 meters in height, an air pressure of more than 2 bar is required in the ventilation lance. It is further preferred that the pressure, in particular the pressure drop, and the volume flow are measured during the pressurization of the ventilation lance. In order to reduce the pollutants in the soil, a preferably upper soil layer can preferably be enriched with microbes before the beginning of the soil aeration. The air rising in the contaminated soil during aeration triggers the local pollutants (in particular hydrocarbon compounds), which are transported in a long-term process (for example, during transport and through the microbial enriched, possibly even deliberately applied to the contaminated soil). during about 5 to 8 years) to water and carbon dioxide are degraded. If, in the monitoring of pressure and volume flow, contrary to expectations, a clogging of the ventilation lance can be determined, the closure cap can be used to release the closure element closing the upper orifice so that a cleaning is made possible, for example, by means of an inserted water hose or with a cleaning spiral. The lateral position of the check valve, the connection of the compressed air line is not affected, so that a desired permanent connection and routing of the lines in the ground is possible. To regenerate a contaminated soil layer, it is preferred that the changeover of the supply of support liquid to rinsing liquid through the drill bit be approximately at the level of the contaminated soil layer, in particular approximately at the level of the lower edge of the contaminated soil layer, or un takes place below the contaminated soil. If the ventilation lance is then drilled with a supply of detergent then still, for example, a few feet deeper into the ground, it is avoided that the support liquid (bentonite) in the borehole fall down to the outlet openings of the drill bit or can clog them, that is achieved that the Air can escape unhindered from the ventilation lance. If the floor ventilation takes place over such a long period of time that, despite the end cap, for example due to leaks, there is a risk of a gradual, excessive sinking of the water mask, it is preferred that the ventilation lance be drilled into the ground to such a depth at least its lower longitudinal section is already below the groundwater level. This leads to the fact that in the closed with the end cap ventilation lance the protection against penetrating soil causing liquid or water column can only drop so far due to leaks until it is at the same level with the groundwater level. Since contaminated soils are problematic primarily at high groundwater levels, which spread the pollutants, the applications generally also have a sufficiently high groundwater level, from which the described, particularly reliable function results. The ventilation lances can preferably be drilled into the ground in a grid of, for example, about 3 × 3 meters, and then preferably showered with a soil treated, for example, about 1 meter thick. In order to recover the position of the ventilation lances, the end cap may be adapted by appropriate means to a location via a GPS system.

The Invention will be exemplified below with reference to the figures shown possible embodiments described. It shows:

1 a longitudinal view, partially broken away, of a ventilation lance according to the invention with a drill bit according to the invention, each in a first preferred embodiment,

2 in magnification detail II after 1 .

3 in exploded view the in 2 shown item,

4 in perspective also in the 1 to 3 shown drill bit of the drill attachment,

5 a sectional view taken along section line VV 4 .

6 perspective view of a drill bit of the drill bit according to the invention in a further preferred embodiment,

7 one opposite 6 enlarged sectional view along section line VII-VII in 6 .

8th across from 1 increases the detail VIII shown therein,

9 one opposite 1 enlarged exploded view of detail IX after 1 .

10 a first preferred use of the ventilation lance according to the invention in the first preferred embodiment, in an early use section,

11 in the 10 illustrated preferred use in a later use section,

12 a second preferred use of the ventilation lance according to the invention according to the first preferred embodiment,

13 a third preferred use of the ventilation lance according to the invention according to the first preferred embodiment,

14 1 is a sectional view of the use according to another aspect of the invention of a well injection anchor for soil remediation according to a preferred embodiment, in a first use step;

15 the use after 14 in a later use step and

16 the use after the 14 . 15 in an even later use step.

1 shows in a partially broken and reduced in comparison to the actual size ratios longitudinal view of the ventilation lance according to the invention 1 with a drill attachment according to the invention 2 in a respective first preferred embodiment. In the example chosen, the drill bit comprises 2 a drill bit 3 with a connection threaded hole 4 and a drill stem screwed into it 5 , wherein instead of such a two-part housing guide shown alternatively a gehäuseeinteiliger structure of the drill attachment 2 it is possible. The drill shaft 5 forms a central passageway in the drill attachment 2 a section of a fluid channel 6 for supplying a fluid, such as gas and / or liquid, to the drill bit 3 lying outlet openings 7 forms. According to the invention the drill attachment 2 with a check valve 8th equipped, whose Reverse direction in the direction of the outlet openings 7 to a connection opening of the drill attachment to that of the drill bit 3 opposite end of the drill shank 5 is directed. In the example chosen, the free end of the drill stem 5 for extending the ventilation lance 1 by means of a coupling nut 9 with a supply pipe 10 screwed, which in turn by means of other coupling nuts 9 and supply pipes 10 forming a continuous feed channel 13 is extended. The drill shaft 5 and the supply pipes 10 are so far the same construction, as they on their outer shell side with a longitudinal direction L respectively continuous, similar external thread 11 are provided for screwing the drill bit 3 and the coupling nuts 9 can serve. In the 1 Arrangement shown is also exemplary insofar as the number of supply pipes 10 may also differ from the number selected herein. At the remote from the drill attachment free end of the ventilation lance is in the local supply pipe 10 a pressure fitting 12 screwed. About this can the ventilation lance 1 , If necessary, with the addition of a so-called. Rotary inlet, a fluid to be supplied. Inside the ventilation lance 1 the supplied fluid passes through the center through the supply pipes 10 and coupling sleeves 9 extending feed channel 13 and through the connection opening at the upper end of the drill shank 5 in the fluid channel 6 of the drill attachment 2 and herein in the case of the open position of the check valve 8th to the outlet openings 7 and through them into a borehole or in the adjacent soil.

The 2 and 3 show that in 1 given detail II in contrast enlarged, in a sectional and an exploded view. The dimensions resulting from the enlargement are in a size range which is of practical importance for numerous applications. In particular, in the example chosen, with regard to the drill stem 5 and the supply pipes 10 a cross section with an inner bore diameter of 16 millimeters and an outer jacket diameter of about 40 millimeters proposed. The outer diameter of the drill bit is slightly more than the outer tube diameter, in the example about 90 millimeters. The length of the drill shank 5 and the supply pipes 10 , in the 1 can be shortened, for example, each 3 meters. Deviations from the aforementioned dimensions or size ratios are also possible, wherein a large overall length of the ventilation lance can also be achieved by a correspondingly large number of tubes. With reference to the 2 and 3 First, the structure and function of the check valve 8th described. This acts on the fluid channel 6 a, which extends between a connection opening at the in 2 upper free, not shown end of the drill shaft 5 and the outlet openings 7 extends. The check valve 8th has a valve spring as a spring check valve 14 and a valve seat tapered conically toward the port 15 on, against which a ball 16 as a valve body of the valve spring 14 is pressed. This requires that the locking direction S of the check valve 8th in the passage direction of the outlet openings 7 facing the connection opening. In the example chosen is as a valve spring 14 a cylinder compression spring provided by a engaging in its cylinder cavity spring bolt 17 is held. This one is with a ring collar 18 in one with a ring protrusion 19 provided central longitudinal bore 20 the drill bit 3 supported. In further detail is the valve seat 15 as a widening through a sleeve 21 extending bore 22 educated. The sleeve having a cylindrical shell 21 is in turn in one of the front wall 23 of the drill shaft 5 outgoing bore 24 until it stops against an annular projection formed in this hole 25 inserted and can be held captive in this position by press or transition fit. With regard to the valve body, ie the ball 16 , is the resilient support on the drill bit 3 , ie with respect to the valve seat 15 provided in the opposite direction. In the example chosen, starting from an end face 26 the connection threaded hole 4 an extension section 27 the central longitudinal bore 20 for receiving the valve spring 14 and the spring bolt 17 provided, extending up to the annular projection 19 extends. In the in 2 shown assembly state act the end wall 23 and the frontal area 26 as a stopper together, through which when screwing the drill shank 5 into the drill bit 3 automatically the desired spring preload of the valve spring 14 ie, the desired opening pressure of the check valve 8th , results. In the embodiment shown so that at the same time a simple and reliable to montie-saving arrangement is achieved, which also tolerates rotary centering boring due to the centering of the valve components. In this context, the insensitivity of the valve seat against damage by the valve body by adjusting the cross-sectional contour, ie by increasing the contact surface, can be increased. In the chosen example of the ball 16 could be the valve seat 15 be rounded in the same way with the ball radius instead of tapered. Also, the valve seat can 15 and the ball 16 for example, be hardened. To protect the valve spring 14 can, for example, the spring bolt 17 in his in the valve spring 14 engaging portion have a length that allows only a slight clearance of the valve body and a correspondingly only short travel. Deviating from the chosen representation of the spring bolt 17 also in the longitudinal direction L continuous bore with eg. In the valve spring 14 branching off openings pointing, leaving the central longitudinal bore 20 at the same time as part of the fluid channel 6 with an outlet opening 7 is to be used. In the embodiment shown in the figures, it is provided that the fluid channel 6 in the fluid supply direction behind the valve body, ie the ball 16 , in the extension section 27 a branch 28 forms, from the side in the plane of the drawing two fluid holes 29 Branch off sideways symmetrically. This requires that the check valve 28 on the two fluid bores 29 evenly acting. In the example, the direction of the laterally branching fluid bores 29 with respect to the boring feed direction V obliquely in front, wherein the branch angle α between the longitudinal direction L or longitudinal symmetry line and the direction of fluid drilling 45 Degree is. In an already discussed possible embodiment of the spring bolt 17 as a hollow part, the central longitudinal bore 20 as another fluid hole 29 serve. Through this, the fluid, ie gas and / or liquid, can be supplied from the tip of the drill attachment centrally forward into a borehole or directly into the ground.

The design of the already with respect to the 1 to 3 described drill bit will continue with respect to the 4 and 5 clarified. 4 shows in perspective that the drill bit 3 is designed as a stepped drill bit, in which chisel-tip-like, each aligned at a radial, arranged symmetrically to a central axis M cutting elements 30 on three different levels 31 . 32 . 33 are arranged different radial extent. As cutting elements 30 Carbide cutting elements are provided, the degree edge 34 extends at right angles to the central axis. The first stage 31 is formed by four at the top of the drill bit or the drill bit by 90 degrees to each other offset cutting elements 30 educated. Also in the second and third stages 32 . 33 that's the first step 31 follow in this order in the longitudinal direction, are each four, each offset by 90 degrees cutting elements 30 available. It is envisaged that the cutting elements 30 in their radial orientation with respect to the cutting elements 30 the following or the previous stage are arranged offset by 45 degrees. In an imaginary projection of the three stages 31 to 33 in a common cross-section includes an imaginary line connecting the radially outer ends of the cutting elements 30 with the central axis an angle of 30 to 70 degrees. It can be seen that the outlet openings 7 all in the one with the cutting elements 30 occupied cutting section, which is directed to the drill bit or on the drill bit in the selected example in Bohrvorschubrichtung forward. 5 , whose plane of character also passes through the central axis M, is opposite to the plane of 2 turned 45 degrees. Here it becomes clear that the extension section 27 the bore 20 one from the frontal area 26 towards the ring ledge 19 has conically tapered cross-section. If provided as a valve body ball 16 starting from the closing position of the check valve shown in the figures 8th by the pressure of a drill shaft 5 supplied fluid against the force of the valve spring 14 towards the top 35 the Bohrvorsat zes 2 the fluid can be displaced by the branching at the same time 28 of the fluid channel 6 forming extension section 27 into the fluid bores 29 and from there through the outlet openings 7 stream. In this open position reaches the ball 16 when its resulting pressurization in the direction of the connection opening at the top of the drill shaft 5 to the outlet openings 7 is directed. The resulting pressurization of the ball 16 depends on the pressure of the fluid in the drill stem 5 and the counteracting pressure in the extension section 27 and the pressure of the valve spring, which depends on the preload or spring travel 14 , The pressure in the extension section 27 For example, in the closed position shown, it may correspond to the atmospheric pressure in a borehole, the pressure of bottom gas, groundwater or the like. The reverse direction S and the passage direction D of the check valve 8th are indicated by arrows.

6 shows in perspective a drill bit of a drill bit according to the invention 2 in a further preferred embodiment. 7 gives a sectional view along line VII-VII 6 again, with corresponding features to the preceding figures are given the same reference numerals. Compared to 6 gives 7 additionally in the drill bit 3 screwed drill stem 5 (in aborted illustration) of the drill attachment 2 again. According to this variant, it is provided that the direction of the two in the plane of 7 laterally branching fluid bores 29 with respect to the boring feed direction V obliquely rearward, this includes an angle of branch α between the central axis M and the direction of fluid drilling of about 60 degrees. Further differences with respect to the embodiment described above exist with regard to the design and arrangement of the cutting edges. The drill bit suitable in the example especially for soft, cohesive soils, such as loam, clay or tufa soil 3 indicates when the drill bit end face is closed 36 two pairs of diametrically opposed drill bit wings offset 90 degrees from each other at the periphery of the drill bit body 37 38 . 39 on that the drill hull 37 protrude radially. The drill bit wings 38 facing the bit wings 39 a larger radial extent. Directed in Bohrvorschubrichtung V exposed edges of the Bohrkronenflügel make integral with the Bohr Crown 3 executed cutting 40 dar. The Bohrkronenflügel 38 also show the cutting 40 opposite the drill bit body 37 inclined towards running, also integrally molded cutting 41 on, which are effective against the Einbohrfschubrichtung V and the unscrewing of the Bohrvorsatzes 2 from the ground. In further detail, it is provided that the end face 23 of the drill shaft 5 when screwed in, not directly in contact with the face 26 the connection threaded hole 4 occurs, but at a projection ahead of her 42 comes into play. In the longitudinal direction L is the distance between the end face 26 and the lead 42 slightly smaller than the diameter of an end wall 23 and face 26 inlaid O-ring 43 selected. The O-ring 43 is so easily deformed, so that the drill attachment 2 is sealed in respect of a fluid supplied therein. Both with regard to the 1 to 5 described Bohrvorsatz as well as in the 6 . 7 shown variant are in view of the shape and arrangement of the cutting also for drilling solid stored soil, such as gravel and sandy soils, well suited. In addition, the points in the 1 to 5 drill bit shown also a good suitability for drilling through soft soil, as well as in view of the achieved by the step arrangement centering effect of rock bottom. In contrast, with reference to the 6 and 7 described Bohrvorsatz further adapted to soft, cohesive soils, such as clay, clay or Kleiboden. This means that the drill attachment according to the invention and thus a ventilation lance according to the invention can be adapted to the respective floor depending on the desired application.

8th shows the in 1 as Detail VIII designated section in an enlargement. Shown are two supply pipes 10 , which by means of a coupling sleeve 9 in the longitudinal direction L are sealingly connected. The coupling sleeve 9 points to the trapezoidal external thread 11 the supply pipes 10 matching trapezoidal internal thread 44 on. The coupling sleeve 9 has in the longitudinal direction L centrally inwandig an annular shoulder 45 on, a rotation stop for the supply pipes 10 forms. These come with their faces 46 against each one O-ring 47 in one at the ring heel 45 adjacent ring groove 48 is inserted. The connection of the supply pipes 10 is thus sealed with respect to a. By the ventilation lance supplied fluid.

9 shows that in 1 contained detail IX enlarged in exploded view. In the free end of the supply pipe 10 is in the bore of the feed channel 13 an internal thread on the face side 49 cut, which to a standardized thread 50 a pressure fitting 12 is adjusted. At the mouth 51 can be either directly or with the interposition of a known so-called. Dreheinführung a fluid source, eg. A compressed air generator or a water pipe connected. Such connection options for a pressure fitting may preferably be on all supply pipes 10 be realized either one or both ends.

10 shows a first preferred use of the ventilation lance according to the invention 1 according to the first preferred embodiment. In the in 10 shown early stage of use is the ventilation lance 1 in a reproduced in the bottom of the floor 52 drilled, in which at greater depth pollution 53 is available. The drilling is done by means of a drawing not reproduced, known per se drill (eg. With a hammer drill). Symbolically it is shown that at the same time as drilling fluid or flushing water W into the ventilation lance 1 fed and from their drill attachment 2 into the formed borehole 54 is rinsed. The water pressure is chosen so that on the one hand, the check valve 8th of Borhe intent 2 On the other hand, the water still seeps away so quickly that a rise in the borehole 54 especially when penetrating the contaminant 53 not possible. The water rinse brings the advantage that, depending on the condition of the soil 52 a greater rate of drilling is achievable. With the reference number 55 is the level of in the ground 52 contained groundwater 56 shown. With 57 is a biologically active powder that is used to break down particles of contamination 53 in the upper layer of the soil 52 was mixed.

11 shows in shortened by the double lines representation in comparison to 10 later process step, after the ventilation lance 1 under multiple extension by means of supply pipes 10 and coupling sleeves 9 through the pollution 53 through to the groundwater 56 drilled and the drill was removed after reaching the maximum drilling depth of about 32 meters in the example or at least turned off. At a selected length in the example of a supply pipe 10 and the drill shaft 5 each of three meters are a total of ten supply pipes 10 connected, leaving a free projection of about one meter. At the time shown is the in 10 still existing annular gap 58 of the borehole 54 according to the nature of the soil already sunken. Symbolically it is indicated that with a compressor as fluid air (Lu) through the pressure fitting 12 into the ventilation lance 1 is pressed. This passes through the feed channel 13 and in its extension through the fluid channel 6 in the drill attachment 2 and through its outlet openings 7 in the groundwater 56 soaked ground. Because the annular gap 58 no longer exists, the injected air spreads in the ground 52 and increases therein in a manner known per se with entrainment of particles of the impurity 53 on top, whereupon the particles in the upper soil layer through the biologically active powder 57 be reduced. In this, possibly several years lasting stage of ventilation, the check valve stops 8th sure that even if the air supply fails, for example, or is temporarily shut off, no polluted groundwater in the ventilation lance 1 penetrate or even ascend into it. Accordingly, the predetermined by the check valve pressure to open to be as low as possible, because then this pressure may then be pumped for years air. If the depth of the groundwater at the drilling depth of approx. 30 meters - deviating from the selected representations - would reach the vicinity of the soil surface (ie approx. 30 m water column of the upcoming groundwater), this would mean that the check valve 8th can be opened by only a little more than 3 bar due to an overpressure of the supplied air (Lu).

12 shows one opposite the 10 . 11 in modified use that when drilling to a certain depth B of eg. 24 meters in the annular gap 58 through the ventilation lance 1 a water-bentonite mixture 59 and only at a greater drilling depth water was pressed. This ensures that even in soils 52 in which the annular gap 58 not or probably only incompletely occurs, the otherwise escaping air leaking conclusion arises.

13 shows a still further possible use, in which prior to drilling the ventilation lance 1 with a screw to a depth T of, for example, 2 meters with a diameter of preferably about 350 to 400 millimeters a hole in the ground 52 introduced and this with bentonite 60 is completed. Subsequently, the drilling of the ventilation lance takes place 1 through the bentonite seal in the soil 52 , which can be rinsed with water. As in 13 indicated, the formed annular gap 58 starting from the top by flowing bentonite 60 filled tightly. Compared to the one with the in 10 . 11 As shown use a faster seal is achieved.

14 shows in longitudinal section the use or a method using a ventilation lance 61 for aeration of contaminated soil 62 according to another aspect of the invention in a preferred embodiment. On average, different layers are visible, of which the layers b, c and d below the natural soil surface 63 and with a is a layer of aufmehreten this, enriched with microbes, ie prepared soil is called. In the example chosen, between the soil layers b, d, the contaminated, ie impurities, soil layer c is embedded. With e is the depth of the groundwater level 75 denoted in the example in the upper part of the contaminated soil layer c. At the ventilation lance 61 is it after the in 14 partly build up around a known drill injection anchor 61 ' , The structure includes a drill bit 64 , a plurality of anchor rods 65 having an inner channel passing through in the longitudinal direction L. 66 and external thread 67 exhibit. The lowest anchor rod 65 is with its external thread in a matching with internal thread 68 provided connection opening 69 the drill bit 64 screwed in, leaving the inner channel 66 in a drill bit side cavity 70 passes. In the drill bit 64 , which in the example chosen is a so-called cross-bit, go from the cavity 70 on the circumference opposite in the radial direction up to openings 71 reaching fluid bores 72 out. In the example chosen has the drill bit 64 an outer diameter of 90 mm, and the anchor rods 65 have an outer diameter of about 40 mm and a diameter of the inner channel 66 of about 20 mm. For connecting adjacent anchor rods 65 are fitted with matching female thread coupling sleeves 73 provided, and in this are two anchor rods 65 screwed in a manner familiar to those skilled in the art, so that a torsionally rigid connection of the rods and a connection of the inner channels 66 ie a total continuous channel results. To the top anchor rod 65 is at the connection end 74 a conventional and therefore in 14 not connected with the so-called. Drive and injection device shown connected. This comprises a known rotary or rotary beating drill drive for drilling the Bohrinjektionsankers and a fluid supply device for supplying a fluid in the inner channel. The chosen representation is not appropriate in size insofar as in the example the length of an anchor rod 3 Meters, on the other hand the height of the soil layer a is about 1 meter, the soil layer b is about 2 meters, the soil layer c is about 24 meters and the soil layer d is about 4 to 6 meters. To the opposite to the representation correspondingly different number of anchor rods 65 Indicate are indicated by double dashed lines risers. In the first in 14 The use or process stage shown became the ventilation lance 61 already drilled to a depth in which the drill bit 64 in the contaminated soil layer c already below the groundwater level 75 located. During drilling, first through the inner channel 66 and the outlet openings 71 a support fluid 76 , in the selected example bentonite, available between the ventilation lance 61 and the bore wall 77 lying annular gaps 78 fed. As 15 clarifies, during further drilling the supply of the supporting liquid 76 maintained only up to a first drilling depth f, which lies approximately at the level of the lower edge of the contaminated soil layer c. In the further, beyond the drilling depth f drilling up to the final (second), in 16 shown drilling depth g is instead of the support liquid, a so-called. Rinsing liquid 79 , in the chosen example water, through the inner channel 66 flushed into the hole. By the during the last about 4 to 6 meters drilling depth supplied drilling fluid 79 first becomes the inner channel 66 with the cavity 70 , the fluid bores 72 and outlet openings 71 rinsed free and also in the selected example, a rearrangement of un located below the contaminated soil layer c length section of the ventilation lance 61 caused with loosened cuttings. At the in 16 shown use or process stage after reaching the final depth g already the drive and injection device has been removed and for the free upper end of the lance a final cap 80 by means of a provided, with internal thread 81 equipped mounting hole 82 screwed. The graduation cap 80 has a lateral fluid connection 83 to which in the example a line leading to a compressed air source (not shown) 84 was connected. In the fluid passage 85 that with the mounting hole 82 is in communication, is a check valve 86 in which it is a spring check valve whose passage direction from the inlet cross section of the fluid port 83 to the mounting hole 82 , ie, the reverse direction is reversed. The graduation cap 80 also has a through hole 87 on, extending to one of the mounting hole 82 opposite to the housing, detachable with a locking screw 88 closable mouth extends. It becomes clear that the lower part of the through hole 87 at the same time part of the fluid passage 85 is. The graduation cap 80 was on the ventilation lance 61 screwed immediately after the removal of the drilling and injection device, wherein at the upper end, the screw plug 88 and the first by the spring action closed check valve 86 a seal is created. This causes the in the over the length of the ventilation lance 61 continuous inner channel 66 still existing detergent column 89 because of the otherwise resulting vacuum is not unhindered through the outlet openings 71 the drill bit 64 can flow out and therefore a level is maintained at the h level marked. The graduation cap 80 was with soil 90 poured over and a cover over it 91 specified with a label for a GPS system. By the arrow 92 is a compressed air supply indicated by the check valve from the in 16 shown closure position is shifted in its Of fenstellung, the compressed air into the inner channel 66 passes and therein, when the air pressure is greater than that of the detergent column 89 generated water pressure is through the detergent column 89 down to the drill bit 64 and through their outlet openings 71 gets into the ground. Through the arrows 93 is schematically the compressed air rise in the ground 62 shown, wherein, starting from the drill bit 64 , first setting a ventilation cone, which is spanned approximately at an angle of 90 °, and above this an upwardly uniformly directed ascent. The in the ground 62 Ascending air causes pollutants contained in the soil layer c to be transported upwards and to be decomposed in the treated soil layer a. The illustration shows that the detergent column 89 , which is an intrusion of soil components into the ventilation lance 61 prevented, with its level even in the case of leaks can only fall so far, to this at the level of the groundwater level 75 is located so that the desired effect is maintained. Through the in the annular gap 78 solidified support liquid 76 the bore is sealed at the top so as to prevent any direct leakage of compressed air through the bore.

All disclosed features are (for itself) essential to the invention. In the disclosure of the application will hereby also the disclosure content of the associated / attached priority documents (Copy of the advance notice) fully included, too for the purpose, features of these documents in claims present Registration with.

Claims (37)

Use of a drill attachment, which has a connection opening and at least one outlet opening for a fluid, wherein a fluid channel is provided between the connection opening and the outlet opening, and the drill attachment has a check valve acting on the fluid channel, the blocking direction pointing in the direction from the outlet opening to the connection opening characterized by a use of the drill attachment ( 2 ) in the soil remediation of contaminated soil, in particular of solidly stored eg. Gravel and / or sand-containing soil, in which use the soil after the completion of the drilling through the drill attachment ( 2 ) Gas, in particular air, is supplied. Use according to claim 1 or in particular according thereto, characterized in that as a check valve ( 8th ) A spring check valve is provided with a valve body, which be minus the fluid channel ( 6 ) under spring effect with resulting pressurization in the direction of the outlet opening ( 7 ) to the connection opening in a closing position and which in the case of a resulting pressurization in the direction from the connection opening to the outlet opening (FIG. 7 ) is in an open position. Use according to claim 2 or in particular according thereto, characterized in that the spring check valve is a valve spring whose dimensioning is adapted to that of the check valve already at a low, out of pressure at the connection port and the pressure at the outlet opening resulting pressure surplus opens in the feed direction of the fluid of at most about 1 bar. Use according to one of the preceding claims or in particular according thereto, characterized in that the drill attachment ( 2 ) one with cutting, in particular with attached cutting elements ( 40 ) made of hard metal, equipped cutting section and the at least one outlet opening ( 7 ) is provided in the cutting portion. Use according to one or more of the preceding claims or in particular according thereto, characterized in that as valve spring ( 14 ) a cylinder compression spring is provided, which is engaged by an engaging into its cylinder cavity spring bolt ( 17 ), which is in an annular projection ( 19 ) provided longitudinal bore ( 20 ) of the drill attachment ( 2 ) is supported. Use according to one or more of the preceding claims or in particular according thereto, characterized in that the drill attachment a drill bit ( 3 ) with a threaded connection hole ( 4 ) and a drill shank which can be screwed therein ( 5 ), through which the fluid channel ( 6 ) in the longitudinal direction, wherein the valve seat ( 15 ) on the drill shaft ( 5 ), in particular at one in a frontal bore 24 of the drill shank ( 5 ) insertable sleeve ( 21 ), and the resilient support of the valve body against the drill bit ( 3 ) is provided. Use according to one or more of the preceding claims or in particular according thereto, characterized in that the fluid channel ( 6 ) a branch ( 28 ), from each to an outlet opening ( 7 ) leading fluid bores, in particular two or three fluid bores ( 29 ), with the check valve ( 8th ) is adapted to the fluid bores ( 29 ) synchronously, in particular evenly, to act. Use according to one or more of the preceding claims or in particular according thereto, characterized in that two fluid bores ( 29 ) in a common plane to a longitudinal symmetry line branch symmetrically sideways, wherein the direction of the laterally branching fluid bores ( 29 ) with respect to the Einbohrfschubrichtung (V) obliquely forward, in particular including a Abzweigungswinkels (α) between the longitudinal direction (L) and the fluid drilling direction of about 35 °, or obliquely behind, in particular including a Abzweigungswinkels (α) between the longitudinal symmetry line and the fluid drilling direction of about 30 ° or about 60 °, has. Use according to one or more of the preceding claims or in particular according thereto, characterized in that as drill bit ( 3 ) a stepped drill bit is provided, in which chisel-tip-like, each aligned at a radial, arranged symmetrically to a central axis cutting elements ( 30 ) made of carbide at different stages ( 31 . 32 . 33 ) of different radial extent are arranged. Use according to one or more of the preceding claims or in particular according thereto, characterized in that the drill bit ( 3 ) At least two the Bohrkronenrumpf radially superior Bohrkronenflügel ( 38 . 39 ) with cutting ( 40 ), wherein the Bohrkronenflügel ( 38 . 39 ) are formed circumferentially spaced and have a different radial extent. Use according to one or more of the preceding claims or in particular according thereto, characterized in that on Bohrkronenflügeln ( 38 ) counter to the drilling feed direction (V) effective Schnei the ( 41 ) are provided. Use according to one or more of the preceding claims or in particular according thereto, characterized in that the drill attachment ( 2 ) is formed as a drill bit, wherein the drill bit has a foot with a connection bore and the fluid channel ( 6 ) and the check valve ( 8th ) between the connection bore and the outlet opening ( 7 ) are arranged. Use according to one or more of the preceding claims or in particular according thereto, characterized in that the drill attachment is used as a head part of a self-drilling through the drill attachment self-drilling ventilation lance, which comprises a number of supply pipes ( 10 ), wherein as supply pipes ( 10 ) Anchor rods with a shell side in the longitudinal direction (L) passing through external thread ( 11 ) are provided, which by means of the threaded ends aufschraubbarer coupling sleeves ( 9 ) are connectable to each other and by means of a Coupling sleeve on a drill shank of the drill attachment ( 2 ) and / or in a connection threaded bore of the drill attachment ( 2 ) are screwed. Use according to one or more of the preceding claims or in particular according thereto, characterized in that the use during sampling and / or regeneration of contaminated Soil is done. Use according to one or more of the preceding claims or in particular according thereto, characterized in that the self-drilling ventilation lance to supply air to the soil beneath contaminated soil, in particular for air supply in groundwater ent holding soil used becomes. Use according to one or more of the preceding claims or in particular according thereto, characterized in that the ventilation lance for drilling up to a drilling depth of about 24 meters or about 30 meters into the ground is used. Use according to one or more of the preceding claims or in particular according thereto, characterized in that the drill attachment or the ventilation lance when drilling up to a desired Drilling depth above the maximum drilling depth for the supply of the Bohrungsringpalt sealing support fluid, in particular of a bentonite-containing or bentonite supporting liquid, is used. Use according to one or more of the preceding claims or in particular according thereto, characterized in that the ventilation lance when drilling into the ground to supply a rinse and after completion the bore for the introduction of air, in particular over a longer period, how about several years, is used in the soil. End cap ( 80 ), having an internal thread ( 81 ) provided mounting hole ( 82 ) for screwing onto an externally threaded, in particular at the free end of a ventilation lance or Bohrinjektionsankers arranged anchor rod ( 65 ), further comprising a fluid connection ( 83 ) for connecting a fluid source, a fluid passage ( 85 ), the fluid connection and the mounting hole ( 82 ) and a check valve ( 86 ), whose passage direction from the inlet cross-section of the fluid port ( 83 ) to the mounting hole ( 82 ) and its locking direction from the mounting hole ( 82 ) is directed to the inlet cross section of the fluid port. End cap according to the preceding claim or in particular according thereto, characterized in that the check valve ( 86 ) has a spring-loaded valve body, wherein the strength of the spring load is in particular adjustable. End cap according to one or both of the preceding claims or in particular according thereto, characterized in that a through-bore ( 87 ), extending from the mounting hole ( 82 ) to a housing opposite, detachable with a closure element such as a screw plug ( 88 ) closable mouth, and that the check valve ( 86 ) in one of the throughbore ( 87 ) branching bore is arranged. Aeration lance, comprising a self-drilling drill bit and at least one anchor rod having a longitudinally extending inner channel which merges into a cavity formed in the drill bit and provided with at least one outlet opening, characterized in that a closure cap ( 80 ) is provided according to one or more of the preceding claims, which on the on the drill bit ( 64 ) opposite free end of the ventilation lance ( 61 ) can be screwed on. Aeration lance according to one or more of the preceding claims or in particular according thereto, characterized in that a self-drilling drill bit ( 64 ) is provided, the outer contour, in particular their cutting geometry, is adapted to a drilling operation with at least about weighing lateral soil displacement. Ventilation lance according to one or more of the preceding claims or in particular according thereto, characterized in that the ventilation lance ( 61 ) several, with continuous external thread ( 67 ) and inner channel ( 66 ) provided anchor rods ( 65 ), which by means of coupling nuts ( 67 ), which have matching internal thread, are connectable. Use of a Bohrinjektionsankers, wherein the Bohrinjektionsanker comprises a self-drilling drill bit and at least one anchor rod, wherein the anchor rod has a longitudinally extending inner channel, which merges into a bore formed in the drill bit and provided with at least one outlet opening, characterized by a use of the Bohrinjektionsankers ( 61 ' ) as a ventilation lance ( 61 ), in particular for the ventilation of contaminated soil, wherein the ventilation lance ( 61 ) for drilling down to a first drilling depth (f) of the drill bit ( 64 ) in the ground ( 62 ), the ventilation lance ( 61 ), in particular when drilling up to a larger second drilling depth (g), for supplying a rinsing liquid ( 79 ), in particular of water, is used in the bore and the ventilation lance ( 61 ) after drilling to inject compressed air through one in the inner channel ( 66 ) of the ventilation lance ( 61 ) existing detergent column ( 89 ), in particular water column, into the ground ( 62 ) is used. Use according to the preceding claim or in particular according thereto, characterized in that the ventilation lance ( 61 ) when drilling down to the first drilling depth (f) of the drill bit ( 64 ) for the supply of the Bohrungsringspalt ( 78 ) sealing support fluid ( 76 ), in particular for supplying a bentonite-containing or bentonite supporting liquid ( 76 ), is used. Use according to the preceding claim or in particular according thereto, characterized in that a ventilation lance ( 61 ) is used according to one or more of the preceding claims. Use according to one or more of the preceding claims or in particular according thereto, characterized in that after the drilling on the drill bit ( 64 ) opposite free end a graduation cap ( 80 ) is screwed according to one or more of the preceding claims, so that in the inner channel ( 66 ) of the ventilation lance ( 61 ) from rinsing liquid ( 79 ) formed liquid column ( 89 ), in particular the formed water column, at least partially retained. Use according to one or more of the preceding claims or in particular according thereto, characterized in that the ventilation lance ( 61 ) for injecting compressed air through the end cap ( 80 ) and through in the inner channel ( 66 ) of the ventilation lance ( 61 ) existing detergent or water column ( 89 ) is used, wherein the air pressure of the compressed air, the barrier pressure of the check valve ( 86 ) of the end cap ( 80 ) and the pressure of the liquid column standing in the aeration lance ( 89 ) or water column. Use according to one or more of the preceding claims or in particular according thereto, characterized in that during the compressed air admission of the ventilation lance ( 61 ) the pressure, in particular the pressure drop, and the volume flow, is measured. Use according to one or more of the preceding claims or in particular according thereto, characterized in that the changeover of the supply of supporting liquid ( 76 ) on rinsing liquid ( 79 ) through the drill bit ( 64 ) takes place approximately at the level of a contaminated soil layer (c), in particular approximately at the level of the lower boundary layer of the contaminated soil, or below the contaminated soil. Use according to one or more of the preceding claims or in particular according thereto, characterized in that the ventilation lance ( 61 ) is drilled into the ground to a depth (g) in which at least a lower longitudinal section of the ventilation lance ( 61 ) below the groundwater table ( 75 ) is located. Use according to one or more of the preceding claims or in particular according thereto, characterized in that a drill attachment or a drill bit ( 64 ), which is adapted to result in a predominantly lateral displacement of drill cuttings during drilling. Use according to one or more of the preceding claims or in particular according thereto, characterized in that the adaptation lies in the fact that the direction of the laterally branching fluid bores ( 29 ) with respect to the drilling feed direction (V) obliquely forward, in particular including a branch angle (α) between the longitudinal direction (L) and the direction of fluid drilling of about 45 degrees. Use according to one or more of the preceding claims or in particular according thereto, characterized in that the geometry, in particular the arrangement and shape on the drill bit ( 64 ) or provided on the drill attachment cutting, adapted to that results in drilling at least predominantly lateral displacement of cuttings. A method using a drill injection anchor, the drill injection anchor comprising a self drilling drill bit and at least one anchor rod, the anchor rod having a longitudinal inner channel which merges into a cavity formed in the drill bit and provided with at least one exit port, characterized by use of Drill injection anchor ( 61 ' ) as a ventilation lance ( 61 ), in particular for aeration of contaminated soil ( 62 ), whereby the ventilation lance ( 61 ) for drilling down to a first drilling depth (f) of the drill bit ( 64 ) in the ground ( 62 ), the ventilation lance ( 61 ), in particular when drilling to a larger second drilling depth (g), for supplying a rinsing liquid ( 79 ), in particular of water, is used in the bore and the ventilation lance ( 61 ) after drilling to inject compressed air through one in the inner channel ( 66 ) of the ventilation lance ( 61 ) existing Detergent column ( 89 ), in particular water column, into the ground ( 62 ) is used. Method according to the preceding claim or in particular according thereto, characterized in that in the method of use according to one or more of the claims 26 to 35 are realized.