DE102017104879A1 - Method, apparatus and use of the device for anchoring a vertical component in a borehole - Google Patents

Abstract

Method for anchoring a component in a borehole (9), comprising the following steps. Inserting a drill string 87) into the wellbore (9) and removing a first portion (18) of the soil (19) from the wellbore (9). Introducing a fluid into the wellbore (9) and mixing a second portion (20) of the soil (19) in the wellbore (9) with the fluid and removing the drill string (7) from the wellbore 89). Following this, the component is introduced into the second part (20) of the soil (19) in the borehole (9). The fluid used in each case is a means for liquefying the second part (20) of the soil (19) in the borehole (9). The fluid hardens in the borehole (9) together with the second part (20) of the soil (19).
Drill pipe for carrying out the method and use of the device for liquefying the soil (19) in a borehole (9).

Description

The invention relates to a method for anchoring a vertical component in an excavation, preferably a borehole according to the features of claim 1. It further relates to a drill pipe for carrying out the method according to the features of claim 5 and the use of the drill pipe according to claim 11.

From the DE 10 2008 005 452 B4 For example, a method for consolidating ground sections is known. Injected media are introduced into a bore to solidify the soil. In the introduced into the soil bore an injection tube is introduced, which is repeatedly pressed. About the injection tube, an injection medium is pressed. The injection tube has on the bottom side an outer drill rod equipped with a drill bit. About the injection tube, a jacket mixture is introduced into the well directly during drilling or after reaching the Endinbohrtiefe an inner rod. For compressing the injection medium, a packer is introduced into the injection tube. The injection tube remains as a lost pipe with the building crown in the ground.

It proves to be disadvantageous that the soil of an excavation, e.g. must be solidified or otherwise prepared for anchoring a structural element, must be removed from the excavation.

Depending on the geological structure of the soil, the preparation or processing of the soil to anchor a component often proves to be difficult.

The soil is transported to a separate location and processed there. The treated soil is transported back to the construction site and further processed there. Treatment means measures for solidification, liquefaction or other treatment of the soil.

However, known methods prove to be very time consuming and expensive.

The invention therefore has the task of providing a method and an associated drill pipe with which a treatment, directly on site, can be carried out in the construction site. Furthermore, it is assumed that the treatment of the soil is a measure for the liquefaction of the soil.

Another object of the invention is that the liquefaction of the soil is to be carried out at different height levels in the excavation.

An additional object is that for the liquefaction of the soil to be introduced into the excavation at least two components can be introduced temporally and spatially independently.

• - Einführen eines Bohrgestänges in das Erdreich; und
• - Entfernen eines ersten Teils des Erdreichs aus dem Bohrloch; und
• - Gleichzeitiges oder späteres Einbringen eines Fluids in das Bohrloch; wobei das Fluid ein Mittel zum Verflüssigen des zweiten Teils des Erdreichs im Bohrloch ist;
• - Vermengen eines zweiten Teils des Erdreichs im Bohrloch mit dem Fluid; und
• - Entfernen des Bohrgestänges aus dem Bohrloch; und
• - Einführen des Bauteils in den zweiten Teil des Erdreichs im Bohrloch, wobei das Fluid ein Mittel zum Verflüssigen des zweiten Teils des Erdreichs im Bohrloch ist; und
• - das Fluid im Bohrloch zusammen mit dem zweiten Teil des Erdreichs aushärtet.

The objects are achieved by a method for anchoring preferably a vertical component in a borehole, which comprises the following steps:

• - Introducing a drill string in the soil; and
• - removing a first part of the soil from the borehole; and
• Simultaneous or later introduction of a fluid into the borehole; the fluid being a means for liquefying the second part of the soil in the wellbore;
• - Mixing a second part of the soil in the borehole with the fluid; and
• - Removing the drill string from the borehole; and
• Introducing the component into the second part of the soil in the borehole, wherein the fluid is a means for liquefying the second part of the soil in the borehole; and
• - Cures the fluid in the borehole together with the second part of the soil.

The process can be carried out in situ.

The objects are further achieved by a device for carrying out the method with at least one drill pipe having a drill rod comprising a drill head. The boring bar comprises an outer wall and at least one fluid conduit extending axially of the boring bar to the longitudinal axis thereof.

For the discharge of the fluid through the outer wall of the drill rod at least one fluid outlet bore is arranged.

The tasks are additionally solved by the use of the device for liquefying the soil in a borehole.

In the following, the method according to the invention, the device and the use of the device in connection with a borehole will be described. It goes without saying that the process, the drill string and the use of the device on a pit with a larger diameter than the diameter of a borehole are applicable.

well

A well is understood to mean a preferably cylindrical depression in the ground. The terms borehole, borehole and a hole created by drilling in the soil or rock are understood as synonyms. The bore may also be a horizontal or vertical breakthrough. The breakthrough can be a connection between the earth's surface and a hollow in the earth's interior. However, the breakthrough can also connect two cavities below the surface of the earth.

Purely by way of example and in no way exclusively, in the sense of the present invention, the term bore means a so-called blind hole which is introduced from the earth's surface into the earth. The bore may comprise a length of centimeters to several meters.

The hole has below the surface of the earth on a bottom closing the hole.

The bore may have a round, an oval or a square diameter. The diameter of the hole can also have any other geometric shape.

It can be a single hole introduced into the soil.

It can also be placed side by side several holes in the soil. The multiple holes can communicate with each other.

The well can traverse several soil and / or rock strata below the surface of the earth. To stabilize the hole and to protect against collapse, the hole can be lined at least partially with sheet piling. The sheet pile wall may consist of individual profiles or be tubular. The sheet pile wall may lean against the soil surrounding the wellbore.

soil

The borehole is introduced into the ground from the surface of the earth.

The soil may be of a loose to medium dense consistency and may include sand, gravel, dense soil, rocks and / or hard cohesive soil. It goes without saying that the preceding list is meant to be exemplary only. For the purposes of the present invention, ground is also understood to mean earth or rock containing soil.

As the drill pipe is inserted into the soil to excavate the wellbore, part of the soil must be removed from the soil. This part is called the first part of the soil.

In the area of the bottom of the borehole a second part of the soil is arranged, which is preferably loosened by the boring head, but has not been removed from the borehole.

drill pipe

The drill string is inserted into the soil to create the wellbore. When inserted into the soil, the drill string rotates about its longitudinal axis.

The drill pipe preferably comprises at least one drill rod. Several drill rods can be connected together axially. For connection with each other, the boring bars have connecting flanges.

The drill rods may exemplarily and not exclusively have a diameter of 10 cm to 50 cm. The drill rods can also have any other diameter. The boring bars may have a round, an oval, an elliptical or an angular cross-section. The boring bars can also have a different geometric cross section.

In the context of the present invention, however, drilling rods are also understood as tools for expanding a hole in the ground, such as so-called "backreamer".

The drill string may comprise a single boring bar or a plurality of vertically juxtaposed boring bars. The juxtaposed drill rods may be arranged in series next to each other or positioned at an angle to each other.

The horizontally juxtaposed drill rods of the drill pipe are preferably connected to each other via a web connection and spaced. The drill rods of the drill string can also be fixed horizontally to each other in other ways.

The boring bars are preferably hollow or partially hollow inside and are preferably provided for transport of fluids, solids and / or suspensions.

The at least one drill rod of the drill string is preferably cylindrical and has an outer wall which extends along the longitudinal axis of the drill rod and surrounds the preferably hollow interior of the drill rod. The interior of the drill rod can be used to transport fluids, solids and / or suspensions. In the interior of the boring bar, in addition to or as an alternative to the interior space, at least one pipeline may be provided for transport, preferably of fluids, solids and / or suspensions.

The pipeline may be made of a different material than the boring bar.

The pipeline can be arranged on the inside of the outer wall of the drill rod. The at least one pipeline may also extend within the outer wall of the boring bar.

At its two end faces, the drill rod is open in the axial direction and in each case has a flange for connection to a further drill rod.

The drill rod of the drill pipe is preferably made of metal, in particular of steel or cast iron. However, it can also find another material use.

Preferably, on the ground surface side end side may be flanged to the drill string a conveyor, preferably a pump.

Mixing paddle and / or helix

In the longitudinal direction of the drill rod of the drill string extensions are arranged on the outer wall of the drill rod, which are designed as mixing paddles or as a screw helix.

The mixing paddle and / or the screw helix are preferably made of the same material as the drill rod. However, the mixing paddle and / or the worm helix may also be made of a different material and preferably be attached to the outer wall of the drill rod in a force-fitting and / or form-fitting manner.

The mixing paddle preferably protrudes laterally from the drill rod. The mixing paddle may be in the form of a fin and may be disposed axially or at an angle to the longitudinal axis of the drill rod.

The mixing paddle is for mixing a fluid introduced into the wellbore.

The spiral helix refers to a conveyor system in the sense of an Archimedean screw. It comprises a spiral wound around the boring bar and a trough formed between the spiral wall and the boring bar. The trough extends along the spiral around the boring bar. As the drill rod rotates about its own axis, soil in the wellbore and / or liquid in the wellbore is carried to the surface of the earth.

The worm helix may extend over the entire length of the drill rod or be arranged only in regions on the drill rod.

If the drill string comprises several drill rods horizontally next to one another, the screw helix of at least one drill rod can be used to loosen and detach the soil.

The screw flight of at least one other drill rod can be designed to convey the dissolved soil to the earth's surface.

Fluid outlet bore

In the outer wall of the drill rod of the drill string at least one fluid outlet bore is arranged.

It can also be arranged a plurality of fluid outlet openings. The fluid outlet openings may be arranged in regions or over the entire length of the drill rod.

In the region in which the outer wall of the boring bar is designed as a mixing paddle and / or in the form of a screw flight, the at least one fluid outlet opening preferably passes through the mixing paddle and / or the screw flight at an angle to the longitudinal axis of the boring bar.

At least one fluid outlet bore may include a valve that may be remotely opened and closed for timing and local control of the introduction of fluids into the wellbore.

fluid

The invention provides that preferably the second part of the soil in the borehole is mixed with a fluid which is introduced via the at least one fluid outlet bore through the boring bar into the borehole.

The fluid may be a liquid, it may be a suspension of liquids and solids and / or may have gaseous substances.

According to the invention, the fluid is a per se known agent, in particular a liquid for liquefying soil.

By liquefaction of the soil, the invention means a mixing, preferably a mixing of the fluid with the second part of the soil. By liquefaction is thus understood any softening, softening, any softening of the soil by fluid as compared to its initial state.

The means for liquefying the soil is preferably a synthetic superplasticizer based on the polycarboxylate ether technology. It goes without saying that other means of liquefying the soil and / or other liquefying admixtures can be used. The fluid is preferably a liquid soil compound.

The liquefaction agent is designed to penetrate the soil quickly and without sticking. When mixed with the fluid, the soil assumes a preferably viscous consistency. The viscosity is dependent on the volume of the liquid for liquefying the soil, as well as the geological condition of the soil

A uniform structure of the soil and a loose or loamy gritty soil requires less fluidity than, for example, a layered soil or a hard-brittle soil or a soil interspersed with rock.

The liquefaction agent has good compatibility with air entraining agents.

The liquefaction of the second part of the soil downhole facilitates the introduction of components into the second part of the soil downhole.

However, the liquefied soil already causes some storage of the introduced component.

The fluidizing effect of the fluid may last for a predetermined period of time. After the predetermined time has elapsed, the fluid and the second part of the soil mixed with the fluid hardens.

The hardened mixture of the second part of the soil and means for liquefying the soil in the borehole causes a firm anchoring of introduced into the second part of the soil, preferably vertical component.

Under anchoring in the context of the invention is understood to mean any attachment attached in the building, support of a component in the ground into which a borehole has been introduced.

component

According to the invention, the component is preferably a vertically extending support, which can be made of iron, in particular cast iron or steel. However, the carrier may also be made of a different material.

By way of example and in no way exclusively, it is assumed that the component is a profile carrier. The component may e.g. be designed as a T-beam, as a double-T-beam or as a U-shaped carrier.

Of course, the component may have a cross-section of another geometric shape, e.g. a wicket form.

Advantages and embodiments of the method, the drill string and the use of the drill string will be explained in more detail with reference to the following drawings.

• 1 in schematischer Darstellung die erfindungsgemäßen Verfahrensschritte,
• 2 ein Bohrgestänge in einem Bohrloch und
• 3 den Schnitt durch die Bohrstange eines Bohrgestänges.

Show here

• 1 a schematic representation of the method steps according to the invention,
• 2 a drill pipe in a borehole and
• 3 the section through the drill rod of a drill string.

For anchoring a preferably vertical component in a borehole (not shown) is in step 1 at least one boring bar 8th a drill string 7 in the borehole 9 introduced. About the helix 14 on the outside of the drill rod 8th is arranged, is at step 2 simultaneously with the insertion of the drill string 7 in the borehole 9 a first part 18 of the soil 19 from the borehole 9 away. With the further penetration of at least one boring bar 8th in the soil 19 will successively soil (first part 18 ) from the soil 15 to the earth's surface 17 promoted.

The drill pipe 7 penetrates into the ground as far as the borehole 9 has reached the target depth.

In a further step 3 is a means, preferably a liquid for liquefying the soil in the wellbore 9 introduced.

At step 4 is in 1 the second part 20 of the soil 19 in the borehole 9 mixed with the means for liquefying the soil.

At step 5 of the 1 becomes the drill pipe 7 with at least one boring bar 8th from the borehole 9 away.

At step 6 of the 1 becomes a vertical component in the second part 20 of the soil 19 of the borehole 9 introduced. The second part 20 is mixed with the means for liquefying the soil. The suspension from the second part 20 of the soil 19 and the liquid introduced therein for liquefying the soil 19 cures after a predetermined time.

By introducing the liquid for liquefying the soil 19 in the wellbore 9 will be in step 6 of the 1 the second part 20 of the soil 19 liquefied. As a result, the penetration of the component in the second part 20 of the soil 19 much easier.

After a predetermined time liquid loses liquefaction of the soil 19 its liquefying effect and hardens.

The suspension from the liquefying agent and the second part 20 of the soil 19 hardens in the borehole 9 and forms a firm anchorage especially for the vertical component, which with his foot in the ground 15 of the borehole 9 located, provided with the means for liquefaction second part 20 of the soil 19 is introduced.

2 shows a drill pipe 7 with a boring bar 8th , It goes without saying that the drill pipe 7 also several horizontally juxtaposed drill rods 8th may include.

The horizontal side by side in the borehole 9 arranged boring bars 8th are preferably over a bridge 10 interconnected and spaced apart (not shown).

The boring bar 8th includes an outer wall 11 holding the inside (not shown) of the boring bar 8th encloses.

On its outside, the outer wall faces 11 the respective boring bar 8th projections 12 on that as a mixing paddle 13 and as a helix 14 are formed.

At the front of the boring bar 8th that the ground 15 of the borehole 9 facing, the drill rod has 8th a drill head 16 on.

At the earth's surface 17 is in 2 left and right next to the drill hole 9 from the borehole 9 transported to the surface first part 18 of the soil 19 recognizable.

Below the drill heads 16 the boring bars 8th is on the ground 15 of the borehole 9 a second part 20 of the soil 19 shown.

In the outer walls 11 the boring bars 8th are the fluid outlet openings 21 the boring bars 8th represented by the means for liquefying (fluid) of the second part 20 of the soil 19 in the borehole 9 is introduced.

The as a mixing paddle 13 and / or helix 14 trained extensions 12 the outer walls 11 the boring bars 8th have fluid outlet openings 21 on, through which the fluid for liquefying the second part 20 of the soil 19 in the borehole 9 is introduced.

3 shows a cross section through the drill rod 8th ,

In the outer wall 11 the boring bar 8th is a fluid line 22 brought in. Another fluid line 23 is on the inside of the outside wall 11 the boring bar 8th appropriate.

An interior 24 the boring bar 8th can also be used as a fluid line.

In the area of the outer wall 11 are in 3 Fluid outlet openings 21 shown, each a valve 25 exhibit.

LIST OF REFERENCE NUMBERS

1

Inserting the drill string

2

Remove the first part of the soil

3

Introducing the fluid into the borehole

4

Blending the second part of the soil with fluid

5

Remove the drill pipe

6

Inserting the component

7

drill pipe

8th

drill rod

9

well

10

free

11

outer wall

12

extension

13

mixing paddle

14

screw spiral

15

ground

16

wellhead

17

earth's surface

18

first part soil

19

soil

20

second part soil

21

Fluid outlet opening

22

Fluid line in outer wall

23

fluid line

24

inner space

25

Valve

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 102008005452 B4 [0002]

Claims (11)

A method of anchoring a component in a wellbore (9) that is placed in a soil, comprising the steps of: - introducing a drill string (8) into the soil (19); and - removing a first part (18) of the soil (19) from the wellbore (9); and simultaneously or later introducing a fluid into the wellbore (9); and mixing a second part (29) of the soil (19) in the wellbore (9) with the fluid; and - removing the drill string (7) from the wellbore (9); and - introducing the component into the fluid-confused second part (29) of the soil (19) in the well (9), characterized in that - the fluid comprises means for liquefying the second part (20) of the soil (19) in the Borehole (9) is; and - that the fluid in the borehole (9) hardens together with the second part (20) of the soil (19). Method according to Claim 1 , characterized in that the fluid is introduced along the longitudinal axis of the drill rod (8) in the borehole (9). Method according to Claim 1 , characterized in that the fluid in the region of a drill head (16) of the drill string (7) is introduced into the borehole (9). Method according to one or more of the preceding claims, characterized in that the fluid is a suspension for liquefying the soil (19). Apparatus for carrying out the method according to one of Claims 1 to 4 with a drill rod (7) which has at least one drill rod (8) having a drill head (16), which comprises an outer wall (11) and at least one fluid line extending axially in the interior (24) of the drill rod (8) ( 26), characterized in that the outlet of the fluid through the outer wall (11) of the drill rod (8) at least one fluid outlet bore (21) is arranged. Device after Claim 5 , characterized in that the outer wall (11) at least partially extensions (12) in the form of mixing paddles (13) and / or in the form of screw flights (14), wherein in the extensions (12) for the exit of the fluid from the drill rod ( 8) in each case at least one fluid outlet bore (21) is arranged. Device after Claim 5 or 6 , characterized in that the interior (24) of the drill rod (8) forms the fluid line (26). Device after Claim 5 , characterized in that at least one fluid line (22) in the outer wall (11) of the boring bar 88) extends. Device after Claim 5 , characterized in that at least one fluid line (23) on the said inner space (24) of the boring bar (8) facing side of the outer wall (11) is arranged. Device according to at least one of Claims 5 to 6 , characterized in that the fluid outlet bore (21) has a controllable by a control valve (25). Use of the device according to one of Claims 5 to 10 for liquefying the soil (19) in a borehole (9).

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