DE202020002716U1 - Device for picking up drilling dust during test drilling for the evaluation of concrete structures - Google Patents

Abstract

Device for receiving drilling dust during test drilling for the evaluation of concrete structures, the device having a housing through which a section of a hollow drill used for the test drilling and stored in a drilling machine is passed and the drilling dust starting from the hollow space of the hollow drill through an air stream over a Channel structure is passed along an opening of a collecting container connected to the housing, characterized in that on the housing (1) at right angles to the longitudinal axis of the hollow drill (2) a connection piece (4) for a suction pipe and diametrically opposite a can holder (5) for detachable Fastening of a sample box (3) are arranged, wherein in the housing (1) in the area of the support of the hollow drill (2) a first channel (K1) enclosing the hollow drill (2) is designed, which either via a transverse bore in the shank of the hollow drill (2 ) or via an opening on the face at one end section of the hollow boring rers (2) can be connected to the cavity of the hollow drill (2), the first channel (K1) having an opening which opens into a second channel (K2) which extends from the housing (1) into the can receptacle (5) to runs directly in front of the inlet cross-section for a sample container (3), with a third channel (K3) being arranged immediately after the outlet cross-section of the second channel (K2), which runs in a flow direction changed by 180 ° to the second channel (K2) has at least twice as large a flow cross-section as the second channel (K2), which runs from the socket receptacle (5) through the housing (1) and which at the transition area from the housing (1) to the connecting piece (4) for the suction pipe into the connecting piece ( 4) opens.

Description

The invention relates to a device for receiving drilling dust in test bores for evaluating concrete structures, the device having a housing through which a section of a hollow drill used for the test drilling and stored in a drilling machine is passed and the drilling dust, starting from the cavity of the hollow drill a flow of air is directed via a duct structure along an opening of a collecting container connected to the housing.

Drill dust samples are analyzed for various evaluations of concrete structures. The samples are usually taken by drilling holes with a drill in the object to be examined. Corresponding test boreholes are drilled in accordance with defined test plans and the drilling dust that arises is collected for a subsequent material analysis. For an exact analysis result, the assignment of the drill dust samples to the specific drill holes must be guaranteed.

The drilling dust can be collected in a simple manner by means of a manual pick-up, in that a worker picks up the drilling dust produced with a cup held on the borehole. However, this variant is questionable. In particular, the worker has to hold a hammer drill with both hands in order to achieve safe tool guidance. If he holds the hammer drill (if this is at all possible due to the weight and movement of the tool) with only one hand and a beaker with the other hand, adequate occupational safety is not guaranteed. If, on the other hand, the worker only picks up the drill dust after the drilling work has been completed, a considerable proportion of the drill dust has already been blown out of the borehole due to the high rotational speed of the drill. Thus, only a small amount of sample material remains and the worker has additional work to collect the drilling dust after the test hole has been drilled. If, finally, another worker holds a beaker to hold drilling dust, this results in significantly higher personnel costs. These disadvantages have led to the fact that the drilling machines used for such test bores are brought into operative connection with additional assemblies in such a way that the drilling dust produced is detected at the same time as the test bore is bored.

the end DE 10 2005 009 314 A1 a drill dust collecting device is known. The drill is enclosed in a housing. A brush system is arranged in the housing, which wipes off the drill dust from the drill bit while drilling. In addition, the drill is cleaned of drill dust by the brush system as soon as the drill is pulled out of the drill dust collector after drilling. The disadvantage here is that only the drilling dust is collected, which is conveyed from the drill to the brush system. In contrast, the amount of drill dust that remains in the borehole is not recorded.

DE 1 276 536 A describes a device in which the drill dust is sucked through a hollow drill through a hose into a cyclone and is separated there. The air flow required to extract the drilling dust is generated by a radial fan integrated in the drilling machine. However, only a low negative pressure can be generated with a radial fan. This has the disadvantage, especially in the case of narrow cross-sections, that the volume flow is greatly reduced and thus the suction is impaired. As a result, the resulting drill dust is not completely captured and a lot of drill dust escapes between the drill and the bore wall during drilling. This amount cannot be recorded for sampling and leads to unnecessary dust nuisance for the worker.

the end DE 94 15 732 U1 a device for taking up drill cuttings during test bores in concrete structures with a drilling machine is known. Here, an air flow induced by a suction fan is guided to an outlet opening, this air flow being guided through the hollow drill and along an opening of a collecting container.

DE 10 2011 087 361 B3 describes a further device for picking up drilling dust with a drilling machine, designed as a housing which encloses a transverse bore of a hollow drill. An air flow induced by a fan is fed into the housing. This air flow is directed through the hollow drill and along an opening of a collecting container connected to the housing.

The last two approaches mentioned, however, only achieve an inadequate service life and can only be used for a specific drill.

Another device for picking up cuttings is off DE 10 2015 006 182 B4 known. A diaphragm pump is integrated in the housing of this device and the housing is designed in such a way that an air flow induced by the pump is guided into the housing to an outlet opening on the housing, the air flow through the hollow drill and along an opening connected to the housing Collection container is directed.

Tests have confirmed that with this device the drilling dust accumulating during test bores can be almost completely collected and can be assigned to several test bores without mixing. The use of a diaphragm pump has the advantage that high negative or positive pressures can be generated in the housing, so that an effective air flow is available for removing the drilling dust. However, after several years of use of this device, problems are also apparent. Because the diaphragm pump arranged in the housing shows functional deficiencies in some cases due to the high dust exposure with drilling dust with increasing operating time. As a result, regular maintenance of this assembly is necessary, which causes additional costs and impairs the desired long-term maintenance-free use.

The object of the invention is to create a device for receiving drilling dust with which the drilling dust can be completely recorded when drilling a test hole without additional manipulation by a worker and which, due to its design, can be used largely maintenance-free over a long period of time even with heavy dust exposure can.

This object is achieved in that a connection piece for a suction tube and a can holder for detachable attachment of a sample can are arranged on the housing of the device at right angles to the longitudinal axis of the hollow drill. In the housing, in the area of the support of the hollow drill, a first channel surrounding the hollow drill is configured, which can be connected to the hollow space of the hollow drill either via a transverse bore in the shaft of the hollow drill or via an opening at an end section of the hollow drill. This first channel has an opening which opens into a second channel which runs from the housing into the can receptacle up to immediately in front of the inlet cross section for a sample can second channel runs through 180 ° changed flow direction and has a flow cross-section at least twice as large as the second channel. This third channel, starting from the can holder, runs through the housing and opens into the suction nozzle at the transition area from the housing to the connection nozzle for the suction pipe.

If the first channel is in operative connection with its inner cavity via a cross hole in the shaft of the hollow drill, this first channel in the housing is designed as a groove-shaped annular channel and its inlet cross-section is arranged in the area of the circumferential cross hole of the hollow drill. If, in an alternative embodiment, the first channel is operatively connected to its inner cavity via an opening on the end face of the hollow drill, this first channel in the housing is designed as a cylindrical ring channel and its inlet cross-section is in the area of the opening on an end portion of the hollow drill arranged. With these alternative designs, the device can be positioned in two variants, each with a different arrangement relative to the hollow drill. This is explained in more detail in the exemplary embodiment.

The connection piece for a suction pipe can preferably be connected to a vacuum cleaner on its end face opposite the housing. By using a separate vacuum cleaner, the power required for a specific application can be modified in a simple manner. At the same time, functional disturbances as a result of a high level of dust in the housing are largely avoided compared to the previously common designs with an integrated diaphragm pump. The device can be used with all standard hammer drills. Both mains-powered and battery-powered drills can be used.

The can receptacle is closed on its end opposite the housing with a cover which has a signal pin and on the inside of which a membrane is arranged. One embodiment suggests that the can receptacle is attached to the housing with a magnetic connection. A magnetic ring, for example, is suitable for this. In this way, the sample jar can always be arranged vertically downwards, regardless of the specific alignment of the drill and housing, so that complete detection of the drill dust is guaranteed.

One embodiment suggests that the housing is releasably closed with a cover disk on the end face arranged in the longitudinal direction of the hollow drill. In this case, at least one sealing ring and several ball pressure pieces are preferably arranged between the cover plate and the housing. The connection between the housing and the cover plate can be implemented using a bayonet lock, for example.

In addition to the described features essential to the invention, the device is brought into operative connection with other construction elements known per se. A telescopic guide which surrounds the hollow drill and which consists of an inner telescopic tube and an outer telescopic tube is provided adjacent to the housing. Between the two telescopic tubes is arranged a compression spring. Furthermore, the telescopic guide has a stop ring with a scale for setting the depth of penetration of the hollow drill into the test hole to be made. In addition, a dust cap, which has openings for an air flow, is arranged on the end section of the hollow drill directed towards the test bore.

By using the device according to the invention for receiving drilling dust, when drilling a test hole, the drilling dust accumulating can be completely recorded without additional manipulation by a worker. Due to its design, the device can be used largely maintenance-free over a long period of time, even with heavy dust exposure.

• 1 den Aufbau der Vorrichtung in einer ersten Ausführung in Explosionsdarstellung
• 2 das Funktionsprinzip der Vorrichtung gemäß 1 in stilisierter Darstellung
• 3 den Aufbau der Vorrichtung in einer zweiten Ausführung in Explosionsdarstellung
• 4 das Funktionsprinzip der Vorrichtung gemäß 3 in stilisierter Darstellung

An exemplary embodiment of the invention is described below with reference to the drawing. Show it:

• 1 the structure of the device in a first embodiment in an exploded view
• 2 the principle of operation of the device according to 1 in stylized representation
• 3 the structure of the device in a second embodiment in an exploded view
• 4th the principle of operation of the device according to 3 in stylized representation

The device shown in the drawing is designed to take up drilling dust during test bores for evaluating concrete structures (not shown). The device has a housing 1 through which a section of a hollow drill (not shown) used for the test hole (not shown) and mounted in a drilling machine (not shown) 2 is led. The drilling dust is starting from the cavity of the hollow drill 2 by airflow over a duct structure along an opening of one with the housing 1 connected collecting container 3 directed. This principle is known in principle, so that more detailed explanations in this regard can be dispensed with.

What is essential in the present case, however, is that on the housing 1 each at right angles to the longitudinal axis of the hollow drill 2 a connecting piece 4th for a suction tube and diametrically opposite a can holder 5 for the detachable attachment of a sample box 3 Executed collecting container are arranged.

In the case 1 is in the area of the support of the hollow drill 2 on the hollow drill 2 enclosing first channel K1 designed.

When executing according to 1 and 2 is the first channel K1 via a cross hole in the shank of the hollow drill 2 with the cavity of the hollow drill 2 in operative connection. Here is the first channel K1 in the housing 1 designed as a groove-shaped annular channel and with its inlet cross-section in the area of the circumferential transverse bore of the hollow drill 2 arranged.

When executing according to 3 and 4th is the first channel K1 via an opening on the face at one end section of the hollow drill 2 with the cavity of the hollow drill 2 in operative connection. Here is the first channel K1 in the housing 1 designed as a cylindrical ring channel and with its inlet cross-section in the area of the front opening at an end section of the hollow drill 2 arranged.

Regardless of its specific design, the first channel has K1 always an opening that leads into a second channel K2 flows out. The second channel K2 runs out of the housing 1 into the can holder 5 until immediately in front of the inlet cross-section for the sample container 3 . Immediately after the exit cross-section of the second channel K2 is a third channel K3 arranged.

The third channel K3 runs in one to the second canal K2 flow direction changed by 180 °. The flow cross-section of the third channel K3 is at least twice as large as the flow cross-section of the second channel K2 . The third channel K3 runs based on the can intake 5 through the housing 1 and ends at the transition area from the housing 1 to the connecting piece 4th for the suction pipe in this connecting piece 4th . The connecting piece 4th for the suction pipe is on its the housing 1 opposite end face with a vacuum cleaner (not shown) connectable.

The can intake 5 is on her the case 1 opposite end face with a cover 6th locked. The lid 6th has a signal pin 7th on and on its inside is a membrane 8th arranged. The can intake 5 is preferably magnetic on the housing 1 attached, for example with a magnetic ring (not shown).

The case 1 is on the longitudinal direction of the hollow drill 2 arranged end face with a cover disk 9 releasably closed. Between the cover disk 9 and the case 1 are at least one sealing ring 10 and several ball thrust pads 11 arranged. The connection between the housing 1 and the cover disk 9 can be designed in various ways, for example with a bayonet lock.

The appropriately designed housing 1 is brought into operative connection with an adjacently arranged telescopic guide during operation during the creation of the test bores, which also a section of the hollow drill 2 encloses. This telescopic guide consists of an inner telescopic tube 12th and from an outer telescopic tube 13th , between which a compression spring 14th is arranged. The telescopic guide also has a stop ring 15th with a scale 16 for setting the penetration depth of the hollow drill 2 into the test hole to be created. At the end section of the hollow drill directed towards the test hole 2 is a dust cap 17th arranged, which has openings for an air flow. The dust cap 17th is in accordance with the execution 1 supported on the front end portion of the telescopic guide and in the embodiment according to 3 on a mounting ring 18th . Also are out 1 as additional components, a locking ring made of elastomer 19th , a rolling bearing 20th and a locking ring 21 evident.

• Am Anschlussstutzen 4 für das Saugrohr wird zunächst ein Staubsauger angeschlossen. Nach dessen Inbetriebnahme baut sich im Inneren des Gehäuses 1, der Dosenaufnahme 5 und der Probendose 3 ein Vakuum auf. Dieses Vakuum bewirkt, das über die Kanäle K3, K2 und K1 das beim Bohrvorgang entstehende Bohrmehl durch den Hohlraum des Hohlbohrers 2 abgesaugt wird. Das in den Kanal K1 angesaugte Gemisch von Luft (stilisiert mit Pfeilen) und Bohrmehl (stilisiert mit kleinen Kreisen) strömt im Kanal K2 in Richtung des Eintritts der Probendose 3. Im Übergangsbereich zum Kanal K3 und somit unmittelbar vor dem Eintritt in die Probendose 3 wird die Richtung der Strömung um 180° umgelenkt. Gleichzeitig vergrößert sich im Kanal K3 der Strömungsquerschnitt. Dadurch ergibt sich eine Verminderung der Strömungsgeschwindigkeit. Die Kombination von Umkehr der Strömungsrichtung und Absenkung der Strömungsgeschwindigkeit bewirkt, dass sich ein wesentlicher Anteil von Bohrmehl aus dem angesaugten Gemisch von Luft und Bohrmehl in der Probendose 3 abscheidet. Eine weitgehend optimale Abscheidung von Bohrmehl wird erreicht, sofern die Probendose 3 unabhängig von der Bohrrichtung stets senkrecht nach unten ausgerichtet ist. Hierfür ist die Dosenaufnahme 5 - wie bereits dargelegt - mittels Magneten am Gehäuse 1 befestigt und lässt sich in einem beliebigen Winkel verdrehen. Während des Bohrvorganges drückt die sich im Inneren der Teleskopführung angeordnete Druckfeder 14 die Staubkappe 17 gegen die Wandfläche. Dabei bewirken die Öffnungen in der Staubkappe 17, dass die für das Absaugen notwendige Luft einströmen kann.

With an according to 1 The following functional sequence is realized, which is stylized in 2 is shown:

• At the connecting piece 4th A vacuum cleaner is first connected for the suction pipe. After commissioning, it builds up inside the housing 1 , the can intake 5 and the sample jar 3 a vacuum on. This vacuum causes the channels K3 , K2 and K1 the drilling dust produced during the drilling process through the hollow space of the hollow drill 2 is sucked off. That in the canal K1 sucked in mixture of air (stylized with arrows) and drilling dust (stylized with small circles) flows in the channel K2 in the direction of the entry of the sample can 3 . In the transition area to the canal K3 and thus immediately before entering the sample container 3 the direction of the flow is deflected by 180 °. At the same time it enlarges in the canal K3 the flow cross-section. This results in a reduction in the flow velocity. The combination of reversing the direction of flow and lowering the flow velocity causes a substantial proportion of drilling dust from the sucked-in mixture of air and drilling dust in the sample container 3 separates. A largely optimal separation of drilling dust is achieved, provided that the sample container 3 is always oriented vertically downwards regardless of the drilling direction. This is what the can holder is for 5 - as already explained - by means of magnets on the housing 1 attached and can be rotated at any angle. During the drilling process, the compression spring located inside the telescopic guide presses 14th the dust cap 17th against the wall surface. The openings in the dust cap are responsible for this 17th that the air required for suction can flow in.

With an according to 3 configured device, a similar functional sequence is realized, which is stylized in 4th is shown. However, in this version, the housing 1 and the can intake 5 at the front of the head of the hollow drill 2 arranged. Here, too, is achieved by connecting a vacuum cleaner to the connector 4th creates the required vacuum for sucking off the drill cuttings. However, the air required to transport the drilling dust is thereby passed through the hollow drill 2 sucked in.

List of reference symbols

1

casing

2

Hollow drill

3

Collection container / sample container

4th

Connection piece for suction pipe

5

Can intake

6th

lid

7th

Signal pin

8th

membrane

9

Cover disk

10

Sealing ring

11

Ball thrust piece

12th

inner telescopic tube

13th

outer telescopic tube

14th

Compression spring

15th

Stop ring

16

scale

17th

Dust cap

18th

Mounting ring

19th

Locking ring

20th

roller bearing

21

Circlip

K1

first channel

K2

second channel

K3

third channel

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102005009314 A1 [0004]
• DE 1276536 A [0005]
• DE 9415732 U1 [0006]
• DE 102011087361 B3 [0007]
• DE 102015006182 B4 [0009]

Claims (10)

Device for receiving drilling dust during test drilling for the evaluation of concrete structures, the device having a housing through which a section of a hollow drill used for the test drilling and stored in a drilling machine is passed and the drilling dust starting from the cavity of the hollow drill through an air stream over a Channel structure is passed along an opening of a collecting container connected to the housing, characterized in that on the housing (1) at right angles to the longitudinal axis of the hollow drill (2) a connection piece (4) for a suction pipe and diametrically opposite a can holder (5) for detachable Fastening of a sample box (3) are arranged, wherein in the housing (1) in the area of the support of the hollow drill (2) a first channel (K1) enclosing the hollow drill (2) is designed, which either via a transverse bore in the shank of the hollow drill (2 ) or via a front opening at an end section of the hollow boom hrers (2) can be connected to the cavity of the hollow drill (2), wherein the first channel (K1) has an opening which opens into a second channel (K2) which extends from the housing (1) into the can receptacle (5) to runs directly in front of the inlet cross-section for a sample container (3), with a third channel (K3) being arranged immediately after the outlet cross-section of the second channel (K2), which runs in a flow direction changed by 180 ° to the second channel (K2) has at least twice as large a flow cross-section as the second channel (K2), which runs from the socket receptacle (5) through the housing (1) and which at the transition area from the housing (1) to the connecting piece (4) for the suction pipe into the connecting piece ( 4) opens. Device according to Claim 1 , characterized in that the first channel (K1) in the housing (1) is designed as a groove-shaped annular channel and is arranged with its inlet cross-section in the area of the circumferential transverse bore of the hollow drill (2). Device according to Claim 1 , characterized in that the first channel (K1) in the housing (1) is designed as a cylindrical ring channel and is arranged with its inlet cross-section in the area of the front opening on an end section of the hollow drill (2). Device according to Claim 1 , characterized in that the connection piece (4) for a suction pipe can be connected to a vacuum cleaner on its end face opposite the housing (1). Device according to Claim 1 , characterized in that the can receptacle (5) is closed on its end opposite the housing (1) with a cover (6) which has a signal pin (7) and on the inside of which a membrane (8) is arranged. Device according to Claim 1 , characterized in that the can receptacle (5) is attached to the housing (1) with a magnetic connection. Device according to Claim 1 , characterized in that the housing (1) is releasably closed on the end face arranged in the longitudinal direction of the hollow drill (2) with a cover disk (9), with at least one sealing ring (10) between the cover disk (9) and the housing (1) and a plurality of ball pressure pieces (11) are arranged. Device according to Claim 7 , characterized in that the housing (1) and the cover plate (9) can be connected to one another via a bayonet lock. Device according to Claim 1 , characterized in that the device adjacent to the housing (1) has a telescopic guide surrounding the hollow drill (2), which consists of an inner telescopic tube (12) and an outer telescopic tube (13), between which a compression spring (14) is arranged and wherein the telescopic guide has a stop ring (15) with a scale (16) for setting the depth of penetration of the hollow drill (2) into the test hole to be made. Device according to Claim 9 , characterized in that a dust cap (17) which has openings for an air flow is arranged on the end section of the hollow drill (2) directed towards the test bore.

Images