TW200303955A - Method and device for drilling holes - Google Patents

Abstract

In a method and device for drilling, in particular percussion drilling or rotary percussion drilling, holes (3) in soil or rock material, wherein a drill hole (3) is formed by a drill bit (1) mounted on a drill rod assembly (2) by a percussive and/or rotary movement and an enveloping or jacket tube (10) is introduced into the drill hole (3), wherein excavated material and/or scavenging and/or cooling fluid introduced into the region of the drill bit (1) particularly through the drill rod assembly (2) is introduced into an annular space (13) defined between the external periphery of the drill rod assembly (2) and the internal periphery of the jacket tube (10), and discharged from the drill hole (3), via at least one supply opening (12), it is provided that, during or upon completion of the drill hole (3), the supply of scavenging and/or cooling fluid into the drill bit (1) is interrupted, that the supply opening (12), for the introduction of excavated material and/or scavenging and/or cooling fluid into the annular space (13) present between the drill rod assembly (2) and the jacket tube (10) is interrupted and, in particular, sealed in a fluid-tight manner, and that the enveloping or jacket tube (10) on its end (14) projecting from the drill hole (3) is fixed and sealed relative to the drill hole wall (16) in a fluid-tight manner, thus reliably preventing the penetration of water particularly under high pressure from the drill hole (3) as well as an emergence of elements of the drilling device. (Fig. 2)

Description

200303955 V. Description of the invention ο) [Technical field to which the invention belongs] The present invention relates to a drilling method, in particular to an impact drilling method or a rotary impact drilling method for soil or rock materials. The hole is drilled by impact and / or rotary impact by a drill bit installed in the drill rod assembly, and the covering tube or casing can be introduced into the hole, wherein the excavated The material and / or the cleaning and / or cooling fluid introduced into the drill bit area particularly through the drill rod assembly is guided into an annular space formed between the outer circumference of the drill rod assembly and the inner circumference of the casing, and at least one The supply opening is discharged from the bore. In addition, the present invention relates to a drilling device, and more particularly to an impact drilling or rotary impact drilling device for soil or rock materials, in which a drill bit installed in a drill rod assembly And / or rotary action drilling, and a cladding tube or casing provided around the drill rod assembly can be guided into the bore, wherein the cleaning and / or cooling fluid can pass through the drill rod assembly in particular The inside of the body is guided to the digging surface area of the bit, and the excavated material and / or cleaning and / or cooling fluid can be guided to the annular space formed between the drill rod assembly and the casing And is discharged from the borehole through at least one supply opening. [Prior art] The drilling methods and devices introduced earlier are, for example, patent documents AT-B390 303, W0 98/2143, or W0 01/63085, etc., which are conventional. Among these known structures, The excavated concrete and / or the guided cleaning or cooling fluid are discharged through an annular space formed between the drill rod assembly and the casing. The cleaning and / or cooling flow system is

92234.ptd page 7 200303955 " V. Description of the invention (2) If an appropriate hollow space is formed inside the drill rod assembly, it is guided to the digging surface area of the drill bit. However, these known embodiments have the following disadvantages: When the high-pressure water is arbitrarily poured into the borehole during the drilling, the introduced water and the excavated concrete and the introduced cleaning and / or The cooling fluid is discharged from the borehole in particular through the annular space formed between the drill rod assembly and the casing, that is, around the outer circle of the casing; it is dangerous to the operator, and thus it is also possible Due to this ubiquitous high pressure, the entire drilling device is withdrawn from the borehole in a direction opposite to the direction in which it was drilled. [Content] • The object of the present invention is to further develop the device and method originally defined so that when high-pressure water is poured into a borehole, especially when it enters the area of the drill bit, water is prevented from passing through the normal borehole. In the process, penetration of the excavated excavation material and the cleaning and / or cooling fluid formed by the transport cross-section penetration, and the provision of a drilling device or at least a safe anchoring of the casing or sheath to ensure its tightness. In order to achieve these objectives, the method originally defined is basically characterized in that during or after drilling, the supply of cleaning and / or cooling fluid into the bit will be interrupted and used to introduce excavating material and / or cleaning and / Or the cooling fluid entering the annular space P supply port existing between the drill pipe assembly and the casing will also be closed, especially sealed in a fluid-tight state, and the protruding bore of the sheathed tube or casing will be closed. The end is fixed to the wall surface of the borehole and sealed to the wall surface in a fluid-tight state. Because according to the present invention, the supply of cleaning and / or cooling fluid into the drill bit, and the access or supply opening that can enter the annular space formed between the drill rod assembly and the casing

92234.ptd Page 8 200303955 V. Description of the invention (3) will be interrupted or closed to a fluid-tight state respectively. When the borehole is irrigated (especially into the area of the bit), it may be water under high pressure. It will not be discharged from the opposite direction of the supply direction of the cleaning and / or cooling fluid, nor will it be discharged from the direction of transportation of the excavated concrete and the guided cleaning and / or cooling fluid, so as to avoid danger to any operator. And the destruction of additional devices placed outside the borehole. In addition, according to the present invention, the end of the protruding hole of the casing or the covering tube is fixed relative to the wall surface of the drilling hole and sealed in a fluid-tight state to safely prevent water from passing through the casing. The free space between the outer circumferential surface and the inner wall of the borehole penetrates. Therefore, according to the present invention, since the annular space existing between the drill rod assembly and the casing and used to transport the drill bit area during the drilling process is reliably sealed, water is also prevented on the one hand Permeate from outside the casing. It can also ensure that water does not escape from the borehole through the supply duct formed in the drill rod assembly against the supply pressure of the cleaning and / or cooling fluid, and does not lead to the water introduced into the borehole. Supply device. According to a preferred embodiment, it is proposed to form the casing to fill the annular space between the drill rod assembly and the casing due to the reverse movement of the drill bit toward the borehole. The supply opening is sealed with at least one sealing element, which is located at the end away from the digging surface of the drill bit; the movement of the drill bit in the opposite direction of the drilling hole will obtain a desired drilling length In order to prevent and reliably avoid any subsequent problems of water seepage into the borehole. For example, when drilling a hole in a construction site or rock layer with high pressure water in particular, the drill bit will generate a displacement opposite to the direction of the drilling force against the force of the drilling step, and

92234.pid Page 9 200303955 岌, Description of the invention (4) Automatically ensure the proper sealing of the supply opening that can pass into the internal or annular space between the drill pipe assembly and the sleeve, and the present invention also provides interruption Through the features of cleaning and / or cooling fluid supply of the drill rod assembly, anchoring the end of the casing protruding from the borehole and sealing around the outer surface of the casing, the borehole can be automatically completed at the pressure water inlet. The substantial seal at the office. In order to additionally achieve at least the fixing of the casing in the borehole, another embodiment proposes that the end of the casing protruding from the borehole is fixed and particularly wedged or clamped in the sealing area to avoid The casing is pulled out of the borehole in the opposite direction of the borehole. In addition to the fixing and sealing of the end of the casing protruding drill # according to the present invention, if high fluid pressure occurs, a larger force may also be generated at the corresponding cross-sectional area of the drill bit. This force The drilling element will be lifted from the drilling hole by acting on the drilling element. The present invention provides additional fixing, especially by wedging or pinching the end of the corresponding drilling sleeve. In order to be able to recover and arbitrarily reuse at least some parts of the elements that can be used to perform drilling, according to a further preferred embodiment of the present invention, the drill rod assembly itself can be separated from the drill bit after drilling is completed and Remove from the cannula. In this state, the tightness of the drill bit and casing to form the drill hole can be used to counteract the infiltration of water from the drill hole, and the drill rod combination can substantially reuse the entire length of each part. In order to form a proper fixation of the casing, the casing will remain in the borehole when the drill rod assembly and the drill bit are removed, which is proposed according to another preferred embodiment, and when the drill After the rod assembly has been removed in a conventional manner, the borehole and, in particular, the casing or sheath tube are filled with hardened material.

92234.ptd page] 0 200303955 V. Description of the invention (5) Full. In order to achieve the purposes indicated above, the basic feature of the initially defined device is that it has at least one sealing element provided on a supply duct, and the supply duct is used to supply cleaning and / or cooling fluid to the drill bit and at least one The area that opens into the supply opening in the annular space between the drill rod assembly and the casing, and the end of the casing protruding from the borehole is fixed and secured in a fluid-tight state by a fixing and / or sealing device It is sealed against the surrounding soil or rock material, therefore, the supply duct for supplying the cleaning and / or cooling fluid to the drill bit according to the present invention, and the cleaning and / or conveyance for conveying the excavated material and introduction Or the supply conduit of the cooling fluid will be interrupted or closed and sealed under appropriate conditions during the drilling operation to prevent water that can be arbitrarily entered under high pressure from penetrating through the drill bit and the conveying cross-sectional area during the drilling operation. In addition, suitable fixing and / or sealing means are provided to fix and seal the end of the sleeve protruding beyond the bore. In order to ensure a particularly simple and substantially automatic blocking and sealing of the fluid supply to the cleaning fluid supply duct, a preferred embodiment of the present invention proposes a countermeasure against the supply direction of the cleaning and / or cooling fluid. Check valve closed upwards, the check valve is provided in a supply conduit for supplying cleaning and / or cooling fluid to the drill bit, and the check valve is particularly directly disposed in a relatively simple and cost-effective manner Before the cleaning fluid exits (from the opening of an individual channel formed on the digging surface of the drill bit), and if the water entering the digging surface area has a pressure higher than the digging fluid supply pressure, the check valve is about to directly cause the cleaning fluid Automatic block and seal of supply.

92234.ptd Page 11 200303955 i. Description of the invention (6) In order to ensure a particularly reliable sealing of at least one entry or supply opening to the annular space existing between the drill pipe assembly and the casing, the annular space It is used to transport excavated concrete and introduced cleaning and / or cooling fluid during the drilling process. According to another embodiment, at least one sealing element provided on the rim of the drill bit and away from the digging surface of the drill bit is provided, and the sealing element will seal the supply opening formed in the casing and the The supply opening that exists in the annular space between the drill rod assembly and the casing is particularly implemented by moving the drill bit in the opposite direction of the borehole. Such a sealing element will be appropriately arranged on the boring table of the drill bit and away from the digging table Θ of the drill bit, thereby allowing the at least one to pass to the annular space existing between the drill rod assembly and the casing. The drill bit supplied in the casing is automatically blocked and sealed immediately when it is pulled out after the drilling is completed, or it is automatically blocked when the drill bit is accidentally moved against the driving force due to the driving force of water pressure acting on the digging surface. With seal, as mentioned before. Thus, in particular, the problem of high-pressure water penetrating outwardly through the annular space can be effectively avoided. In this context, according to a particularly preferred embodiment, a sealing element formed on the projection of the drill bit and adapted to the internal dimensions of the casing is proposed, and an additional sealing element, in particular a sealing ring, is provided. During the drilling process, the protrusion is used as a guide device P for aligning the drill bit with the center of the casing, and can be accommodated in a relatively close and tight state in any reinforced front end portion of the casing to When the drill bit is pulled out or pushed back in the opposite direction of its bore, a reliable seal is provided in the casing that can lead to a supply opening that exists in the annular space between the drill rod assembly and the casing. Except for the close-fitting arrangement between the drill-bit or drill protrusion in the casing, the sealing action at this time will be

92234.ptd Page 12 200303955 V. Description of the invention (7) It can be assisted by the sealing element, especially the sealing ring, and the additional sealing element is specially arranged to meet the arrangement of the at least one access opening in the closed position. Or configuration location. As mentioned before, when drilling, a large force may be generated due to the high pressure in the direction in which the casing is removed from the borehole, and the large force is caused by the digging surface or cross-sectional area of the drill bit. . In addition to the fixing and sealing of the casing protruding from the drilled hole according to the present invention, according to a further preferred embodiment, at least one fixing or clamping unit formed in the fixing and / or sealing device is provided to fix and seal The sleeve projects the end of the borehole. The fixing or clamping element allows the casing to be introduced substantially without hindrance during the drilling process, and on the one hand generates additional clamping force and supporting force in the direction that the casing withstands the removal from the drilling, that is, with the drilling Provides the function of a fixed sleeve when the thrust is reversed. In this context, the additional fixing of the casing's particularly reliable casing can be easily achieved by fixing or clamping the element formed by an annular element surrounding the casing, which is on its outer surface It is a conical surface and can cooperate with the complementary conical inner surface of the fixing element when the casing moves in the opposite direction of the drilling, thereby avoiding any movement of the casing in the opposite direction of the drilling, and A further preferred embodiment of the invention corresponds. In order to make at least a part of each component of the device of the present invention recyclable and reusable, according to a further preferred embodiment, it is proposed that the drill rod assembly itself can be separated from the drill bit and can be taken out of the borehole. Move out. [Embodiment]

92234.ptd Page 13 200303955 (ii) Description of the invention (8) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The device shown in Figs. 1 and 2 is capable of drilling 3 by means of a drill bit 1 mounted on a drill rod assembly 2, the drill bit 1 comprising, for example, a hard material or hard metal on its digging surface 4 Inlay 5 and through the drill rod assembly 2, the cleaning and / or cooling fluid is guided to the area of the digging surface 4 of the drill 1 through the supply conduit 6 indicated in the figure, and is also indicated in Figures 1 and 2 The exit opening 7. A check valve 8 is provided in the area of the drill 1 of the supply duct 6, and the check valve prevents the cleaning and / or cooling fluid from flowing in the direction opposite to the supply direction shown by the code 9. Φ The drill rod assembly 2 is surrounded by a set of pipes 10, and the excavated material and the introduced cleaning and / or cooling flow system are guided to the channel or supply opening 12 according to arrow 26. An annular space 13 formed between the outer circumference of the drill rod assembly 2 and the inner circumference of the casing 10 is discharged from the drill hole 3 as shown in the drilling state shown in FIG. 1. The end of the sleeve 10 protruding from the borehole 3 is fixed to the ground 16 around the borehole 3 by a fixing device 15 and is provided with a sealing element 17 ° with an indication. In addition, the sleeve 10 protrudes The end region 14 of the borehole 3 is surrounded by a fixing element or a fixed wedge 18, which has an outer surface 19 that is inclined toward the end of the beta sleeve 10 and can fit the The tapered inner contour 20 of the fixing element 15 can be smoothly completed according to the direction of the arrow 9, and the sleeve 10 can also be fixed by the fixing 15 and the sealing device. 17 and the additional sealing device 18 are prevented from moving in the opposite direction of the borehole (that is, the direction of removal from the borehole 3), and for example by means of the borehole fitting 2

92234.ptd Page 14 200303955 V. Description of the invention (9) Traction force is introduced into the borehole 3 as the drilling progresses. Figure 2 shows, for example, the state when the drill bit 1 is retracted into the casing 10 in the opposite direction of the drilling direction 9 due to the infiltration of water, particularly as indicated by the arrow 21, or the drill bit 1 The state in which the casing 10 moves to the inside of the borehole 3 in the direction opposite to the borehole. In the position shown in Fig. 2, the check valve formed in the cleaning and / or cooling fluid supply conduit is closed when the high-pressure water enters the outlet of the space 2 2 located in front of the digging surface of the drill bit 1. In addition, the supply opening 12 which enters the annular space 13 formed between the drill rod assembly 2 and the casing 10 is closed by a sealing element 23, which is formed in A protruding portion 24 which is far from the end of the digging surface 4 of the drill bit 1, and the sealing element 23 is not only guided in a tight and tight state inside the casing 10, but also includes an additional sealing element which is a special seal ring 25 to further assist the sealing effect. Therefore, the sealing element 23 can reliably prevent the material and the occasional high-pressure water from entering the interior of the annular space 13. Because the casing 10 is securely anchored at its end 14 protruding from the borehole 3, and also relative to the surrounding ground 16 by means of a fixing device 15, a sealing device 17 and an additional fixing wedge 1 8 is sealed, so the water and the excavation of the excavation material in the borehole 3 will be safely stopped here. In addition, considering the relative size cross-sectional area of the drill bit 1 and the weight of a drilling element having an arbitrary length, even under high pressures such as 10 bars, the fixing device 15 and the additional The fixing device 18 reliably ensures that the drilling device element from the borehole 3 accompanying the fluid under high pressure does not float. This will avoid the danger to the operator and not specifically illustrated.

___ 92234.ptd Page 15 200303955 V. Description of the invention (ίο) The auxiliary equipment, such as the device that provides power to complete or drill the drill rod assembly 2, may be damaged. When the water infiltration hole 3 is reliably sealed as shown in FIG. 2, the drill rod assembly 2 will be relatively separated from the drill bit or the protrusion 24 including the sealing element, and the new drilling step will be performed. Re-use. To further fix the completed borehole, the interior 13 of the casing 10 is then substantially filled with a hardened material.

92234.ptd Page 16 200303955 Brief description of the drawings [Simplified description of the drawings] Figure 1 is a schematic diagram of the method of the present invention to complete the method of the present invention during the drilling process; and Figure 2 is similar to Figure 1 and is Schematic diagram of the drilling device being securely sealed to avoid the phenomenon of fluid exuding from the drilling device under high pressure. 1 Drill bit 2 Drill rod assembly 3 Drilling 4 Drill bit digging surface 5 Hard inlay 6 Supply conduit 7 Opening 8 Check valve 9 Drilling direction 10 Casing 12 Supply opening P 13 Annular space 14 Drilling end 15 Fixing device 16 Surrounding site 17 Sealing device 18 Fixing device 19 Conical surface 20 Conical inner surface 23 Sealing unit 24 Drill protrusion 25 Additional sealing unit

92234.ptd Page 17

Claims (1)

2Θ0303955 ~ VI. Patent application scope 1. A drilling method, especially a method for impact drilling or rotary impact drilling on soil or rock material, the drilling (3) is installed in The drill bit (1) of the drill rod assembly (2) is drilled by impact and / or rotary impact, and the coated tube or casing (10) can be introduced into the bore (3), where The excavated concrete and / or imported into the area of the drill bit (1), especially the cleaning and / or cooling fluid entering the area through the drill rod assembly (2), is guided into the drill rod assembly The annular space (1 3) between the outer circumference of the body (2) and the inner circumference of the sleeve (1 0) is discharged from the borehole (3) through at least one supply opening (1 2). The sign is that the cleaning and / or cooling fluid entering the drill bit (1) will be interrupted during the drilling (3) or after the drilling is completed, and used to introduce the excavated concrete and / or cleaning and / or cooling fluid The supply opening (1 2) entering the annular space (1 3) existing between the drill rod assembly (2) and the casing (1 0) is also interrupted. Should be, and is especially sealed in a fluid-tight state, and the covering tube or sleeve (1 0) is also fixed at the end of its protruding bore (3) and corresponds to the outer wall (1 6) of the bore Sealed into a fluid-tight state. 2. The drilling method according to item 1 of the scope of patent application, characterized in that the supply opening (1 2) formed in the casing (1 0) is when the drill bit (1) moves in the opposite direction of β of the drilling hole. The excavated concrete is filled into the annular space (1 3) existing between the drill rod assembly (2) and the casing (1 0), and the supply opening (1 2) is formed by at least one of The sealing element (8, 23) on the end remote from the digging surface of the drill bit (1) is sealed. 3. If the drilling method of the scope of patent application item 1 or 2 is characterized in that: 92234.pid Page 18 200303955 200303955 The scope of the patent application for soil and rock is fixed and relatively sealed to the surrounding soil or rock sites in a fluid-tight state (16). 7. The drilling device according to item 6 of the patent application, characterized in that a check valve (8) is provided in a supply conduit (6) for supplying cleaning and / or cooling fluid to the drill bit (1), and To shut off the flow of the cleaning and / or cooling fluid in the direction of supply (9). 8. The drilling device according to item 6 or 7 of the scope of patent application, characterized in that at least one end sealing element (2 3) formed on the drill bit away from the digging surface (4) of the drill bit (1), the seal After completion of the drilling (3), the component (2 3) specifically moves the supply opening (1) formed in the casing (1 0) by the reverse movement of the drill (1) in the drilling direction (9). 2) and the opening which can lead to the annular space (1 3) existing between the drill rod assembly (2) and the casing (1 0). 9. The drilling device according to item 8 of the patent application, wherein the sealing element (2 3) is formed on the drill protrusion (2 4) to fit the internal size of the casing (1 0) and With additional sealing elements (2 5). 10. The drilling device according to any one of claims 6 to 9 of the scope of patent application, characterized in that at least one fixing or clamping element (1, 1 7) is provided in the fixing and / or sealing device (1, 15) 8) to fix and seal the sleeve (1 0) to protrude β the end (14) of the borehole (3). 1 1. The drilling device according to item 10 of the scope of patent application, characterized in that the fixed or clamping unit (18) is formed by a ring-shaped unit surrounding the casing (1 0), and the outside The surface is a conical surface (1 9), and can be matched with the fixed sheet when the casing (1 0) is moved in the reverse direction of the drilling direction (9). 92234.ptd Page 20 200303955 VI. Complementary conical inner surface (2 0) of patent application scope element (1 5), thereby preventing the casing (1 0) from being reversed in the drilling direction (9) Mobile. 1 2. If the drilling device according to item 6, 7, 8, 9, 10, or 11 of the scope of patent application, the drill rod assembly (2) itself can be connected with the drill bit in a known manner ( 1) Separate and can be removed from the borehole (3). 92234.Pid Page 21