Underground construction apparatus and method for building holes
By setting up distribution units and screeners in underground engineering equipment, the problem of insufficient performance of the suction pump is solved, the removal performance and construction efficiency are improved, and efficient hole construction is achieved.
Patent Information
- Application Number
- CN202380034254.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-05-30
- Filing Date
- 2023-05-08
- Publication Date
- 2024-12-27
AI Technical Summary
When building holes in existing underground engineering equipment, due to insufficient performance of the suction pump, the removal speed slows down and the construction progress slows down. Especially when the groove depth increases, the removal performance needs to be reduced to adapt to the conveying performance of the pump, which limits the construction efficiency.
The equipment frame is equipped with a distribution unit, including a suction pipe line, a transport pipe line and a return pipe, and a screen is arranged in it. The screen guides the smaller liquid of the land material to the return pipe, which is larger The particle guide is transported through the pipeline to reduce the workload of the suction pump and improve removal performance.
Through liquid distribution and screening, the removal performance of the suction pump and the material removal output are improved, the liquid transport is reduced, the construction efficiency is improved, and the suspension treatment burden is reduced.
Smart Images
Figure CN119213184A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to an underground engineering device for constructing a hole in the ground according to the preamble of claim 1, the underground engineering device comprising: a device frame; a holding device located at the upper area of the device frame, the holding device being used to hold the underground engineering device on a carrying rope or a carrying rod; a removal device, the removal device having at least one rotatably driven removal element and being arranged at the lower end area of the device frame and being configured to remove ground material; a driving device arranged at the device frame, the driving device being used to rotationally drive the at least one removal element; and a suction device, the suction device being used to suck the removed ground material upward together with the liquid in the hole by means of a suction pipeline, wherein the suction device comprises at least one suction opening located at the lower end area of the device frame and a suction pump arranged at the device frame.
[0002] The present invention also relates to a method for constructing a hole in the ground using underground engineering equipment according to the preamble of claim 10, the underground engineering equipment comprising: an equipment frame; a holding device located at the upper area of the equipment frame, wherein the underground engineering equipment is held on a carrying rope or a carrying rod; a removal device, the removal device having at least one rotatably driven removal element and arranged at the lower end area of the equipment frame, wherein ground material is removed by the at least one removal element for constructing a hole in the ground; a driving device arranged at the equipment frame, by which the at least one removal element is rotationally driven; and a suction device, by which the removed ground material is sucked upward together with the liquid in the hole by means of a suction pipeline, wherein the suction device comprises at least one suction opening located at the lower end area of the equipment frame and a suction pump arranged at the equipment frame. Background Art
[0003] For example, slotted wall milling machines are used as underground engineering equipment for constructing so-called slotted walls or sealing walls, which are required, for example, to fix or seal foundation pits. With the slotted wall milling machine, the ground material is removed by a rotating driven milling wheel and sucked up together with the surrounding supporting suspension or flushing liquid in the milling groove by a suction pump and transported to the ground. The removed suspension or flushing liquid can be removed from the removed ground material in a treatment facility on the ground, and the suspension or flushing liquid can be returned to the groove again. Such slotted wall milling machines and such methods are known, for example, from DE 41 41 629 A1 or EP 2 586 962 A1.
[0004] In order to remove the suspension or flushing liquid from the milling trough, it is known, for example from EP 3 556 942 B1 of the same type, to suck the suspension or flushing liquid together with the removed soil material by means of a suction pump on the milling frame through a suction connection arranged between two pairs of milling wheels.
[0005] The performance of the suction pump must be designed in such a way that the milled-off ground material together with the surrounding liquid can be reliably transported upward from the groove. As the groove depth increases, the conveying length or conveying height also increases, and therefore the work to be performed by the suction pump also increases. As the groove depth increases, a high-performance and therefore expensive suction pump should be provided accordingly. However, due to the limited installation space at the slotted wall milling machine, for example, it is not possible to provide an arbitrarily large pump with a large pump drive. Therefore, during the milling operation, it may be necessary to reduce the removal performance of the milling machine from a certain depth. As a result, the amount of small milling objects produced can be reduced and adapted to the limited conveying performance of the suction pump. However, this reduces the removal speed and slows down the construction process.
[0006] Even in the case of a hole drilling device with a suction pump arranged at the device, corresponding problems may occur. Such a hole drilling device is known from EP 2 930 275 B1 or EP 2 615 239 B1.
[0007] Finally, WO 2016 / 116910 discloses a shaft boring device in which the drilling cooling fluid is divided and separated in a separator unit via a cascade filter in order to minimize the portion of the cooling fluid to be cleaned that is conveyed to the surface via a downstream delivery pump. Summary of the invention
[0008] The invention is based on the object of specifying a geotechnical engineering device and a method for construction, by means of which a borehole can be constructed in the ground particularly efficiently.
[0009] This object is achieved on the one hand by an underground engineering device having the features of claim 1 and on the other hand by a method having the features of claim 10. Preferred embodiments of the invention are specified in the respective dependent claims.
[0010] The underground engineering equipment according to the invention is characterized in that the suction line leads into a distribution unit, which is arranged on the equipment frame and is connected to an upwardly directed transport line and a return line for returning a portion of the sucked liquid to the lower end area of the equipment frame, and the distribution unit has a screen, which is designed to allow liquid with less removed soil material to pass through and either lead to the return line or to the transport line.
[0011] The basic idea of the invention is that a distribution unit is connected to the suction line on the device frame, preferably in the area of the suction pump, from which a transport line leading further upward and a return line leading back downward are connected. A sieve is arranged in the distribution unit, which allows a sub-flow of liquid (which may contain limited smaller removed soil materials) to pass through into the return line or the transport line. Another sub-flow with larger soil materials is guided into another line.
[0012] By arranging the sifter, the ground material in the suspension to be transported upward can be concentrated. Thus, the conveying performance of the suction pump, which is mainly used to transport the removed ground material, is increased, while the liquid used only as a conveying medium can be reduced, in particular reduced to the necessary extent.
[0013] By returning the sucked-in liquid sub-flow together with the removed ground material directly to the plant frame, the work that must be done by the suction pump to carry away the remaining sub-flow upwards is reduced. Thus, even with a suction pump with limited suction performance, efficient operation with high removal performance and a high yield of removed ground material can be achieved.
[0014] The return line is used to guide the liquid branched off at the screen (which liquid can also be called suspension) back into the trough at a suitable point on the frame. This branched off liquid with a lower proportion of removed ground material can be discharged at a suitable point above the milling wheel and preferably substantially without pressure.
[0015] By appropriately designing the sifter with the screen opening, it is possible to define, via the size of the screen opening, the size from which or up to which the removed soil material is transported upward. In particular, it is also possible to define up to which size the soil material with smaller size can be returned by means of the return line and can remain in the suspension and in the soil trough.
[0016] In principle, only the smaller soil materials can be transported upwards, while the coarser soil particles can be conveyed back to the milling wheel for further comminution. This also reduces the burden of handling the suspension on the soil surface.
[0017] Particularly preferably, according to an improved solution of the present invention, the screen is arranged and constructed to allow liquid with smaller removed ground material to pass through to the return line, wherein larger ground particles that cannot pass through the screen can be transported upwards together with the liquid via the transport line. One concept is that a return line with a screen is provided at the device frame, preferably above the suction pump, and the screen allows liquid with smaller removed ground material to pass through, while larger ground particles can be further transported upwards from the holes in the ground via the transport line. By arranging the screen, it can be said that concentration of the ground material in the suspension to be transported upward is achieved. As a result, the conveying performance of the suction pump, which is mainly used to transport the removed ground material, is improved, while the liquid used only as a conveying medium can be reduced, in particular reduced to a necessary extent.
[0018] A preferred embodiment of the present invention is that a regulating unit, in particular a throttle valve or a regulating valve, is arranged at the return line, and the regulating unit is configured to adjust the flow through the return line. In principle, the regulating unit can be any suitable element for adjusting and changing the flow through the return line, wherein the flow in the area of the transport line that is further guided upwards is also changed accordingly. The regulating unit can preferably be a throttle valve, i.e. a constriction in the return line, or a regulating valve, such as a butterfly valve or a valve with an adjustable sliding member. The regulating unit can be manually adjustable or can be remotely controlled and adjusted via a control device. Automatic control can also be provided according to the performance and / or working depth of the suction pump. In particular, with the increase of the working depth and therefore with the increase of the pump work for transporting the removed soil material upwards, the regulating unit can be changed so that the sub-flow in the return line increases. As a result, the sub-flow to be pumped upwards is reduced accordingly, so that the fully milled soil material can be pumped upwards despite the increase in the conveying height.
[0019] According to one embodiment variant of the invention, it is particularly expedient if a servomotor for adjusting the regulating valve is arranged on the device frame. The servomotor can be an electric or hydraulic motor or also a hydraulically or pneumatically actuated servo drive. In principle, the distributor unit can be designed in such a way that no fluid flow is introduced into the return line if, for example, the existing performance of the suction pump is sufficient during operation.
[0020] In particular, an advantageous embodiment of the invention can be that the return line is designed to be telescopic. As a result, the return line can be pushed into a retracted position when it is not needed. Furthermore, it is possible to adjust the return line, which can in particular have a telescopic end pipe, to the desired discharge position. In particular, a diffuser can be provided at the discharge end of the return line, which diffuser serves to ensure that the returned liquid in the milling groove is discharged as protectively as possible.
[0021] According to another embodiment of the invention, the dispensing unit preferably comprises a housing, on which an inlet opening for the suction line, an outlet opening for the transport line and an outlet opening for the return line are formed. The housing can enclose a receiving space in which a sifter is arranged upstream of the outlet opening to the return line.
[0022] A particularly advantageous embodiment of the underground engineering device according to the invention is achieved by arranging a connecting piece with a screen opening in the housing of the distributor unit between an inlet opening for the suction line and an outlet opening for the removal line to form the screen.
[0023] It is particularly advantageous here if the connecting piece is designed as a tube for forming a tubular sieve, so that the sucked liquid can flow through the connecting unit from the inlet opening to the outlet opening in the tubular channel, wherein the liquid to be returned with the smaller soil materials can flow through the sieve opening in the tubular sieve into the adjacent receiving space of the housing of the connecting unit and can flow back from there via the return line.
[0024] A particularly preferred development of the invention is achieved by the fact that the sifter is surrounded by a receiving space in the housing of the distribution unit, wherein the liquid can enter the receiving space via the periphery of the sifter and the receiving space is connected to the return line. In particular, the sifter can be designed as a tubular sifter so that the liquid can enter the receiving space around the distribution unit via the entire periphery of the tubular sifter. This allows for particularly efficient distribution and screening of the sucked liquid with removed ground material. The liquid with removed ground material can also be referred to as a suspension.
[0025] For long-term reliable operation, it is preferred according to an improved solution of the present invention that the sifter is replaceably supported in the housing of the dispensing unit. In particular, a passage to be opened and closed can be provided at the housing of the dispensing unit to facilitate access to the sifter.
[0026] The sifter can be easily disassembled via suitable detachable fixing means and can be easily removed and cleaned or replaced by another sifter when the sifter is worn, especially blocked. In principle, a plurality of sifters or sifter elements can also be provided in the distribution unit, which sifters or sifter elements are arranged, for example, one above the other and can thus form an integral sifter.
[0027] According to a further development of the invention, the underground engineering device is preferably configured as a slotted wall milling machine or a hole drilling device. In the slotted wall milling machine, one or preferably a plurality of milling wheels are arranged, which have milling wheel axes pointing horizontally or transversely to the vertical excavation direction. The slotted wall milling machine preferably has two pairs of milling wheels, which are arranged at the lower end of the device frame and are driven to rotate to remove ground material.
[0028] In the case of a borehole drilling device, a drill head is arranged on the underside of the device frame and is driven in rotation about a preferably vertical drilling axis pointing in the excavation direction. Guide elements for guiding the device in the hole in the ground and preferably also transversely directed tensioning elements can be provided on the device frame of the underground engineering device. The underground engineering device can be tensioned at least in sections against the hole wall via the tensioning elements in order to thereby exert additional excavation forces.
[0029] The invention also includes a method for constructing a hole in the ground, characterized in that the suction line opens into a distribution unit, which is arranged on the device frame and to which an upwardly directed transport line and a return line are connected, through which a portion of the sucked-up liquid is returned to the lower end area of the device frame, and the distribution unit has a screen through which liquid with less removed ground material passes and either to the return line or to the transport line.
[0030] The method according to the invention can be carried out in particular with the aid of one of the underground engineering devices according to the invention described above. The advantages described above can be achieved in this case. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] The present invention is further described below with reference to a preferred embodiment, which is schematically shown in the accompanying drawings. In the accompanying drawings:
[0032] Figure 1 A perspective view showing an underground engineering device according to the present invention, which is configured as an in-hole drilling device;
[0033] Figure 2 Show Figure 1 Enlarged detail of underground engineering equipment;
[0034] Figure 3 A perspective view showing a distribution unit for underground engineering equipment according to the present invention; and
[0035] Figure 4 Show according to Figure 3 Cross-sectional view of the distribution unit. DETAILED DESCRIPTION
[0036] Depend on Figure 1 and Figure 2 An embodiment of an underground engineering device 10 according to the invention is known, which is designed as an in-hole drilling device 11. A holding device 14 shown in the schematic diagram is arranged at the upper end region on the elongated device frame 12. The holding device 14 is designed to hold the underground engineering device 10 on a supporting rope or a supporting rod and can have a hook receiving portion, for example.
[0037] Arranged at the lower end of the device frame 12 is a rotatably driven removal element 22, which, according to the illustrated embodiment, can be a drill head 23 with removal teeth 24 as a removal device 20. The drill head 23 can be driven in rotation about a generally vertical drilling axis via a plurality of drive devices 16 in the central region of the device frame 12 via a tubular drilling drive train 18. The drill rod 18 can be moved axially relative to the device frame 12 in a substantially known manner by means of a feed cylinder 26 in order to perform the drilling step. A schematically illustrated tensioning element 28 can be arranged at the device frame 12, which can be radially extended in order to securely tension the underground engineering device 10 at the wall of a hole in the ground.
[0038] The ground material removed during drilling is sucked away together with the surrounding liquid, which is provided to support the drill hole, by means of a suction device 30 at the drill head 23. A suction opening (not shown in detail) can be arranged at the drill head 23, through which the removed ground material together with the liquid is pumped upwards by means of a suction line 32 and a suction pump 34.
[0039] As detailed in Figure 2 , the suction line 32 here opens into a distribution unit 40 with a preferably box-shaped housing 42. The housing 42 of the distribution unit 40 has an inlet opening 43 for the suction line 32 on its underside. In addition, an outlet opening 45 for a return line 60 is formed on the underside of the housing 42, which is described in more detail below. A regulating valve 70 with a servomotor 72 can be arranged on the return line 60 to adjust the liquid substream to be returned.
[0040] Furthermore, an outlet opening 44 for a removal line 38 is formed on the upper side of the housing 42. The removal line 38 extends upward out of the hole in the ground in order to remove the removed ground material and liquid from the hole and in particular to supply it to a treatment facility in order to separate the liquid from the removed ground material.
[0041] As from Figure 3 and Figure 4 As can be seen in the figure, the receiving space 46 is surrounded by the housing 42 of the dispensing unit 40. A sieve 50 is arranged in the receiving space 46, which is preferably designed as a tubular connecting piece 52 in the illustrated embodiment, which connects the inlet opening 43 of the suction line 32 to the outlet opening 44 of the transport line 38. A plurality of sieve openings with defined opening diameters are provided in the tubular connecting piece 52 to form the sieve 50.
[0042] As a result, the liquid with removed ground material sucked by the suction pump 34 can flow into the distribution unit 40 via the inlet opening 43 and into the transport line 38 via the outlet opening 44 and be transported further upward. Due to the opening in the sifter 50, a portion of the sucked liquid and smaller ground particles of the milled ground material (the smaller ground particles can pass through the opening of the sifter 50) enter the receiving space 46 around the housing 42 of the distribution unit 40. This sub-flow with the screened liquid can enter the return line 60 via the outlet opening 45 and be guided back to the lower area of the device frame 12 via the return line. The return line 60 can be designed to be telescopic with a movable telescopic part 64, wherein the telescopic part has an opening 62 above the drill bit 23 and the telescopic part can follow the drill bit 23 axially movably. As a result, the screened liquid with a portion of the removed ground material of smaller particle size can remain in the hole in the ground without having to be transported further upward.
[0043] In this way, the amount of the liquid subflow that must be transported away from the suction pump 34 upward via the transport line 38 is reduced. In addition, a certain concentration of the removed ground material with larger particles is produced by the distribution unit 40 provided according to the invention with the sifter 50, so that limited pump performance can be effectively used to transport away an increased proportion of the removed ground material.
Claims
1. An underground engineering device for constructing a hole in the ground, the underground engineering device comprising: - Equipment frame (12); - a holding device (14) located at the upper region of the device frame (12), which is used to hold the underground engineering device (10) on a carrying rope or a carrying rod; a removal device (20) having at least one rotatably driven removal element (22) and arranged at the lower end region of the device frame (12) and designed for removing ground material; - a drive device (16) arranged on the device frame (12), the drive device being used to drive the at least one removal element (22) in rotation; as well as - a suction device for sucking the removed ground material upwards together with the liquid located in the borehole by means of a suction line (32), wherein the suction device comprises at least one suction opening in the lower end region of the device frame (12) and a suction pump (34) arranged on the device frame (12); wherein the suction line (32) opens into a distribution unit (40) which is arranged on the device frame (12) and to which is connected an upwardly directed removal line (38) and a return line (60) for returning part of the sucked liquid to the lower end region of the device frame (12); It is characterized in that the distribution unit (40) has a screen (50) which is designed to allow liquid with less removed ground material to pass through either to the return line (60) or to the removal line (38); - wherein the sifter (50) is designed to allow a first sub-flow of liquid with smaller removed soil material to pass through to the return line (60), wherein in a second sub-flow, larger soil particles that cannot pass through the sifter (50) can be transported upwards together with the liquid via the removal line (38) by the suction pump (34).
2. The underground engineering equipment according to claim 1, characterized in that: A regulating unit (70), in particular a throttle valve or a regulating valve, is arranged on the return line (60) and is designed to adjust a flow through the return line (60).
3. The underground engineering equipment according to any one of claims 1 to 2, characterized in that: The return line (60) is designed to be telescopic.
4. The underground engineering equipment according to any one of claims 1 to 3, characterized in that: The dispensing unit (40) comprises a housing (42) on which an inlet opening (43) for the suction line (32), a first outlet opening (44) for the removal line (38) and a second outlet opening (45) for the return line (60) are formed.
5. The underground engineering equipment according to claim 4, characterized in that: In the housing (42) of the dispensing unit (40), a connecting piece (52) with a sieve opening is arranged between an inlet opening (43) for the suction line (32) and a first outlet opening (44) for the removal line (38) for forming the sieve (50).
6. The underground engineering equipment according to claim 5, characterized in that: The connecting piece (52) is designed as a tube for forming a tubular sieve (50).
7. The underground construction device according to any one of claims 1 to 6, characterized in that: The sieve (50) is surrounded by a receiving space (46) in a housing (42) of the dispensing unit (40), wherein liquid can enter the receiving space (46) via the circumference of the sieve (50), and the receiving space (46) is connected to the return line (60).
8. The underground engineering equipment according to any one of claims 1 to 7, characterized in that: The sieve (50) is supported in a replaceable manner in a housing (42) of the dispensing unit (40).
9. The underground engineering equipment according to any one of claims 1 to 8, characterized in that: The underground engineering equipment is configured as a slotting wall milling machine or an in-hole drilling device (11).
10. A method for constructing a hole in the ground using an underground engineering device (10), in particular an underground engineering device according to any one of claims 1 to 9, comprising: - Equipment frame (12); - a holding device (14) at the upper region of the device frame (12), wherein the underground engineering device (10) is held on a supporting rope or a supporting rod; a removal device (20) having at least one rotatably driven removal element (22) and arranged at the lower end region of the device frame (12), wherein ground material is removed by means of the at least one removal element (22) for forming a hole in the ground; - a drive device (16) arranged on the device frame (12), by which the at least one removal element (22) is rotationally driven; and - a suction device, by means of which the removed ground material together with the liquid located in the borehole is sucked upwards by means of a suction line (32), wherein the suction device comprises at least one suction opening in the lower end region of the device frame (12) and a suction pump (34) arranged on the device frame (12); wherein the suction line opens into a distribution unit (40) which is arranged on the device frame (12) and to which an upwardly directed transport line (38) and a return line (60) are connected, through which a portion of the sucked liquid is returned to the lower end region of the device frame (12); It is characterized in that the distribution unit (40) has a screen (50) through which the liquid with less removed ground material passes either to the return line (60) or to the removal line (38); The sieve (50) is designed to pass a first sub-flow of liquid with smaller removed soil material through the return line (60), wherein in a second sub-flow, larger soil particles that cannot pass through the sieve (50) are transported upwards together with the liquid via the removal line (38) by the suction pump (34).