Reaming stabilizing device for raise boring machine construction

Abstract

A reaming stabilizing device for raise boring machine construction comprises two sets of floating stabilizing frames arranged at intervals in the axial direction of a reaming drill rod, each floating stabilizing frame comprises an annular frame body arranged on the periphery of the reaming drill rod in a sleeving mode, a guide channel is defined by the inner side of each annular frame body, and radial clearance fit is formed between the guide channels and the periphery of the reaming drill rod; the reaming drill rod can relatively rotate in the guide channel and relatively move in the axial direction, an outer limiting contour is formed on the periphery of the annular frame body, the outer limiting contour extends outwards in the radial direction, and the outer limiting contour is matched with the hole diameter of a reaming hole section formed in the position where the reaming drill rod is located. Axial limiting structures are arranged on the portion, on the reaming drill rod, of the floating stabilizing frame, the axial limiting structures are located on the two sides of the periphery of the reaming drill rod, the working interval of the floating stabilizing frame in the axial direction of the reaming drill rod is limited through the axial limiting structures, and in a word, the device has the advantages of being simple in structure, high in adaptability, high in construction reliability and good in engineering practicability.

Description

Technical Field

[0001] This invention belongs to the technical field of raise boring machine equipment, and specifically relates to a hole reaming and stabilizing device for raise boring machine construction. Background Technology

[0002] Raise-the-hole drilling rigs are widely used in mining, underground engineering, and tunnel construction. Typically, a pilot hole is drilled first, followed by reaming to create a large-diameter borehole that meets design requirements. During the reaming stage, the drill bit and drill rod must withstand significant cutting forces and the unevenness of the surrounding rock conditions. As the cantilever length of the drill rod increases, it is prone to radial sway and attitude deviation within the borehole. This can lead to problems such as uneven borehole diameter, localized over-excavation of the borehole wall, uneven wear of the reaming tools, and uneven stress on the drill rod. In severe cases, it can even cause drill bit jamming, rockfall, or borehole wall collapse, affecting borehole quality and construction safety. Therefore, stable control of the drill rod's attitude during the reaming stage has become a key factor influencing the quality and safety of raised-the-hole drilling.

[0003] In existing reverse well drilling stabilization technologies, some solutions attempt to limit drill pipe sway by setting up a structure on the outside of the drill pipe that contacts the borehole wall. For example, patent CN105840118A, titled "A Stabilizing Device for Upward Reverse Drilling Rigs," describes a stabilizing device for upward reverse drilling rigs. This device uses a chuck, stiffeners, and support plate on the outside of the drill pipe, allowing the support plate to adhere to the borehole wall during stabilization. This utilizes the reaction force generated by the borehole wall on the drill pipe to counteract the centrifugal force and eccentric load during stabilization, thus constraining the drill pipe's posture. However, this type of "rigid wall-adhering" stabilization method is highly dependent on the borehole wall morphology and borehole diameter consistency. In actual construction, due to uneven rock formations and local variations in borehole diameter, this becomes problematic. Due to variations in surface roughness and borehole wall roughness, these support structures often struggle to maintain uniform contact with the borehole wall, easily leading to significant local frictional resistance and contact stress. This not only increases energy loss during borehole reaming but may also exacerbate borehole wall damage and wear on the stabilizing structure itself. Furthermore, these structures typically require rigid fixation to the drill rod, making it difficult to adaptively adjust to the drill rod's stress state within the reaming section. In long cantilever, large-diameter borehole reaming conditions, the constraint effect on the drill rod's posture remains limited and cannot meet current requirements.

[0004] There is an urgent need for a borehole stabilization device for raise boring machine (RBM) operations that can maintain good adaptability in complex formations and large-diameter conditions, and is less likely to cause additional damage to the borehole wall, thus solving the problems of drill pipe swaying, insufficient guiding stability, and low construction reliability in existing technologies. Summary of the Invention

[0005] In view of this, the present invention proposes a hole reaming and stabilizing device for reverse drilling rig construction, which is applied to the technical field of reverse drilling rig equipment and solves the technical problems of easy drill rod swaying, insufficient guiding stability and low construction reliability.

[0006] To achieve the above-mentioned technical objectives, the specific technical solution adopted by the present invention is as follows: A borehole reaming stabilizing device for raise boring machine (RBM) operations is installed on the outer periphery of the reaming drill rod inside the RBM. It includes two sets of floating stabilizers spaced apart along the axial direction of the reaming drill rod. Each floating stabilizer includes an annular frame body fitted around the outer periphery of the reaming drill rod. The inner side of the annular frame body forms a guide channel, and a radial clearance fit is formed between the guide channel and the outer periphery of the reaming drill rod, allowing the reaming drill rod to rotate relative to each other within the guide channel and move relative to each other axially. The outer periphery of the annular frame body forms an outer limiting profile, which extends radially outward. The outer limiting contour is adapted to the diameter of the reamed hole section formed by the position of the reaming drill rod, so that the floating stabilizer has a limited radial movement space within the reamed hole section. When the reaming drill rod deviates radially, the floating stabilizer forms a geometric limiting fit with the reamed hole section through the outer limiting contour, thereby limiting the maximum deviation of the reaming drill rod. The part of the floating stabilizer on the reaming drill rod is provided with an axial limiting structure, which is located on both sides of the outer periphery of the reaming drill rod. The axial limiting structure limits the working range of the floating stabilizer along the axial direction of the reaming drill rod.

[0007] Furthermore, the outer limiting profile adopts a continuous annular profile extending radially outward, which is used to form an integral in-hole geometric limit for the floating stabilizer in the radial direction.

[0008] Furthermore, the annular frame body includes multiple frame units distributed circumferentially, with connectors between adjacent frame units. The connectors are made of bolts, pins, or hinges. The frame units are spliced ​​together by corresponding connectors to form a detachable closed annular structure to accommodate different specifications of reaming drill rods.

[0009] Furthermore, a low-friction guide layer is provided on the inner side of the guide channel. The low-friction guide layer is fixedly installed on the inner wall of the annular frame body and corresponds to the outer periphery of the reaming drill rod, so that the resistance is reduced when the reaming drill rod rotates and moves axially within the floating stabilizer.

[0010] Furthermore, the axial limiting structure includes a limiting retaining ring disposed on the reaming drill rod and a corresponding limiting groove disposed on the floating stabilizer. The limiting retaining ring extends radially into the limiting groove, and the floating stabilizer is limited to the working range between two adjacent limiting retaining rings.

[0011] Furthermore, the floating stabilizer is set on the reaming rod behind the reaming drill bit and is located within the hole section formed by the reaming drill rod during operation. The axial spacing between two adjacent floating stabilizers is set according to the cantilever length of the reaming drill rod and the reaming hole diameter, so that the reaming drill rod forms a segmented radial constraint zone distributed along the axial direction within the reaming hole section, so as to segmentally limit the radial displacement of the reaming drill rod.

[0012] Furthermore, the outer limiting profile and the hole wall of the reaming section maintain a radial clearance when the reaming drill rod is in a normal coaxial state, so as to allow the reaming drill rod to produce normal micro-offsets during rotation and feeding. Only when the radial offset of the reaming drill rod exceeds the radial clearance does the outer limiting profile and the hole wall of the reaming section form a geometric limiting fit to restrict further offset of the reaming drill rod.

[0013] Furthermore, the outer limiting profile includes multiple elastic limiting segments set on the outer periphery of the annular frame body. These multiple elastic limiting segments are distributed circumferentially and extend radially outward, enabling the floating stabilizer to adapt to local borehole diameter changes caused by uneven rock strata or construction errors in the enlarged borehole section.

[0014] During the drilling process of reaming drill rods, after the reaming drill bit completes cutting, the reamed hole segment formed behind it constitutes an axially confined space with a defined inner diameter. The oscillation of the reaming drill rod within the corresponding reamed hole segment is essentially a radial offset of its centerline relative to the axis of the hole segment. Therefore, this invention sets a floating stabilizer frame on the outer periphery of the reaming drill rod, which can float with the drill rod. The outer confining contour of the floating stabilizer frame forms a confined radial movement space with the reamed hole segment. Thus, when the reaming drill rod deviates and exceeds the range of movement, the floating stabilizer frame restricts its further deviation through geometric confining with the reamed hole segment. This confines the movement trajectory of the reaming drill rod within the central area of ​​the reamed hole segment, achieving passive guidance and stability of the reaming posture. It does not rely on any active support, hydraulic adjustment, or clamping mechanism, but uses the reamed hole segment itself as a spatial constraint reference to achieve passive guidance and stability of the reaming drill rod posture, thereby structurally suppressing oscillation and deflection during the reaming process.

[0015] By adopting the above technical solution, the present invention can also bring the following beneficial effects: 1. This invention discloses a hole stabilization device for raising borehole drilling rigs. By introducing a passive constraint mechanism on the attitude of the reaming drill rod during the reaming process, the drill rod can maintain a relatively stable working state even under long cantilever and large borehole diameter conditions. This avoids problems such as uneven borehole diameter, local over-excavation of the borehole wall, and uneven wear of the reaming tool caused by radial sway and uneven force, thereby improving the quality of reaming and construction stability. Through the geometric constraint of the outer limit contour and the inner diameter of the reaming section, the reaming drill rod is effectively constrained, ensuring that the reaming drill rod always stays within the designed trajectory during the reaming process. This has the advantages of improving reaming accuracy and reducing construction risks.

[0016] 2. This invention discloses a borehole stabilization device for raise boring machine (RBM) construction. By using the reamed borehole section formed after reaming as a spatial constraint reference for the movement of the reamed drill rod, it restricts the attitude of the reamed drill rod without relying on complex control systems or active support structures. This makes the stability effect during the reaming process more determined by the structure itself and the construction conditions, reducing reliance on operating experience and equipment adjustment. Thus, it can maintain good reliability and consistency even in complex formations and harsh construction environments. It does not rely on hydraulic adjustment or active support, but achieves non-contact stability under normal conditions through the geometric adaptation of the floating stabilizer frame to the inner diameter of the reamed borehole section. This reduces the complexity and maintenance costs of traditional support systems and has the advantages of simple structure, strong adaptability, and high engineering feasibility.

[0017] 3. This invention discloses a borehole stabilization device for raising borehole drilling rigs. The stabilization effect is mainly manifested in limiting abnormal deviations during borehole reaming rather than continuous wall support. This reduces long-term friction and rigid impact between the stabilization structure and the borehole wall, reduces wear on the borehole wall and the equipment itself, helps extend the service life of the equipment and reduce borehole wall disturbance. Thus, while ensuring borehole reaming stability, it also takes into account construction efficiency and equipment durability. By setting a low-friction guide layer and an elastic limiting section of the outer limiting contour in the floating stabilizer, it not only effectively reduces the friction between the borehole drill pipe and the borehole wall of the reaming section, but also allows the borehole stabilization device to adapt more freely to changes in the borehole diameter under high load conditions. It has the advantages of reducing maintenance costs and improving the overall economic efficiency of construction. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a borehole stabilization device for raising borehole drilling rig construction mentioned in this invention; Figure 2 This is a schematic diagram of the connection structure between the frame unit and the connector in this embodiment; In the figure: 1. Reaming drill rod; 2. Floating stabilizer; 3. Annular frame body; 4. Outer limiting profile; 5. Connector; 6. Limiting retaining ring; 7. Limiting groove; 8. Frame unit. Detailed Implementation

[0020] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0021] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this invention, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using other structures and / or functionalities besides one or more of the aspects set forth herein.

[0023] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0024] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details. Example 1

[0025] like Figure 1 and Figure 2 As shown, this invention provides a hole reaming stabilization device for raise boring machine (RBM) operations. Applied during the hole reaming stage of a raise boring machine, it is installed on the reaming drill rod 1 behind the reaming drill bit. It is used to stabilize and constrain the attitude of the reaming drill rod 1 during construction. The device includes two sets of floating stabilizers 2 spaced apart along the axial direction of the reaming drill rod 1. Each floating stabilizer 2 includes an annular frame body 3 sleeved around the outer periphery of the reaming drill rod 1. The inner part of the annular frame body 3 forms a guide channel for accommodating the reaming drill rod 1. A radial clearance fit is formed between the guide channel and the outer periphery of the reaming drill rod 1, allowing the reaming drill rod 1 to move within the guide channel. The inner relative ring frame body 3 can rotate freely and move relative to it along the axial direction. A low-friction guide layer is fixedly provided on the inner wall of the ring frame body 3. The low-friction guide layer is provided corresponding to the outer periphery of the reaming drill rod 1. It is used to reduce contact resistance and maintain guiding stability during the rotation and axial movement of the reaming drill rod 1. In specific applications, the low-friction guide layer can be replaced by a rolling guide assembly. The rolling guide assembly includes several rollers arranged circumferentially and in contact with the outer periphery of the reaming drill rod 1, so that the sliding contact between the reaming drill rod 1 and the floating stabilizer 2 is changed to rolling contact, thereby further reducing rotational resistance and reducing wear.

[0026] The outer periphery of the annular frame body 3 forms an outer limiting profile 4, which extends radially outward. The size of the outer limiting profile 4 is adapted to the diameter of the reamed hole formed by the reaming drill bit during the reaming process, so that the floating stabilizer 2 has a limited radial movement space within the reamed hole. The outer limiting profile 4 adopts a continuous annular profile extending radially outward, which is used to form an integral in-hole geometric limit for the floating stabilizer 2 in the radial direction. In practical applications, the continuous annular outer limiting profile 4 can also be replaced by an approximate annular profile formed by splicing multiple arc-shaped limiting segments, which facilitates on-site adjustment and replacement for different hole diameter conditions. In another embodiment, the outer limiting profile 4 also includes multiple elastic limiting segments distributed circumferentially and extending radially outward, replacing the continuous annular profile, thereby forming a radial geometric limiting structure with a certain degree of compliance within the reamed hole.

[0027] The annular frame body 3 is formed by splicing together multiple circumferentially distributed frame units 8. Adjacent frame units 8 are connected to each other by connectors 5. After connection, different frame units 8 form a detachable closed annular structure, which can be assembled and replaced according to different specifications of reaming drill pipe 1. The connectors 5 use bolts, pins or clips to connect the frame units 8, so that the annular frame body 3 can be quickly disassembled and maintained in the downhole environment. When the reaming drill pipe 1 is in a normal coaxial state, the outer limiting contour 4 and the hole wall of the reaming section maintain a radial movement clearance, so as to allow the reaming drill pipe 1 to produce normal micro-offset during rotation and feed. Only when the radial offset of the reaming drill pipe 1 exceeds the radial movement clearance, the outer limiting contour 4 and the hole wall of the reaming section form a geometric limiting fit to limit the further offset of the reaming drill pipe 1.

[0028] The axial position of the floating stabilizer 2 on the reaming drill rod 1 is limited by an axial limiting structure. The axial limiting structure includes two limiting rings 6 fixedly disposed on the outer periphery of the reaming drill rod 1 and corresponding limiting grooves 7 formed on the floating stabilizer 2. The two limiting rings 6 are spaced apart along the axial direction of the reaming drill rod 1. The limiting rings 6 extend radially into the corresponding limiting grooves 7, so that the floating stabilizer 2 is limited within the axial working range between the two adjacent limiting rings 6, thereby allowing the floating stabilizer 2 to maintain a relatively floating state within this range.

[0029] Both sets of floating stabilizers 2 are set on the reaming drill rod 1 behind the reaming drill bit and are located within the already formed reaming hole section. The axial distance between the two sets of floating stabilizers 2 is determined according to the cantilever length of the reaming drill rod 1 and the diameter of the reaming hole section, so that the reaming drill rod 1 forms a segmented radial constraint area distributed along the axial direction within the reaming hole section, so as to segmentally limit the radial displacement of the reaming drill rod 1. When the reaming drill bit continues to advance forward to ream the hole, new reaming hole sections are continuously formed. The floating stabilizers 2 advance forward with the reaming drill rod 1 as a whole and remain within the reaming hole section, providing continuous attitude constraints for the reaming drill rod 1.

[0030] In the process of borehole reaming, the reaming drill rod 1 rotates and moves axially under the drive of the raise boring machine. The floating stabilizer 2 cooperates with the reaming drill rod 1 through the guide channel and the low-friction guide layer, so that the reaming drill rod 1 can rotate and feed normally without additional constraints. When the reaming drill rod 1 tends to swing radially, the outer limit contour 4 restricts it through the geometric limit cooperation formed with the reaming hole section, so that the movement trajectory of the reaming drill rod 1 is always kept in the central area of ​​the reaming hole section, thereby ensuring the stability of the working posture of the reaming drill bit.

[0031] In summary, this invention passively constrains the movement trajectory of the reaming drill rod 1 during the reaming process and uses the reamed hole segment formed by reaming as a spatial limiting reference, enabling the reaming drill rod 1 to maintain a stable working state under large hole diameter and long cantilever conditions. This effectively improves the quality of reaming and the safety of construction, while reducing additional wear on the hole wall of the reamed hole segment and the equipment itself. It has the advantages of simple structure, strong adaptability, high construction reliability, and good engineering practicality.

[0032] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A reaming stabilizer for use in a reaming operation by a reverse circulation drilling rig, the reaming stabilizer being mounted on the outer periphery of a reaming drill string within the reverse circulation drilling rig used for the reaming operation, characterized by: The floating stabilizer comprises an annular frame body sleeved on the outer periphery of the reaming drill rod, the inner side of the annular frame body is surrounded to form a guide channel, the guide channel and the outer periphery of the reaming drill rod form a radial gap fit, so that the reaming drill rod can rotate and move axially in the guide channel, the outer periphery of the annular frame body forms an outer limiting contour, the outer limiting contour extends radially outward, the outer limiting contour is matched with the hole diameter of the reaming hole segment formed by the position of the reaming drill rod, so that the floating stabilizer has a limited radial movement space in the reaming hole segment, when the reaming drill rod produces radial deviation, the floating stabilizer is geometrically limited by the outer limiting contour and the reaming hole segment, thereby limiting the maximum deviation of the reaming drill rod, the part of the floating stabilizer on the reaming drill rod is provided with an axial limiting structure, the axial limiting structure is located on both sides of the outer periphery of the reaming drill rod, and the working range of the floating stabilizer along the reaming drill rod is limited by the axial limiting structure.

2. The hole enlarging stabilizing device for reverse drilling machine construction according to claim 1, characterized in that: The outer limiting contour adopts a continuous circular ring contour extending to the radial outer side, which is used for forming an integral in-hole geometric limiting for the floating stabilizer in the radial direction.

3. The hole enlarging stabilizing device for reverse drilling machine construction according to claim 2, characterized in that: The annular frame body comprises a plurality of frame units distributed in the circumferential direction, and a connecting piece is arranged between adjacent frame units, the connecting piece adopts one of a bolt, a bolt or a hinge, and the frame units are spliced into a detachable closed annular structure through the corresponding connecting pieces, so as to adapt to reaming drill rods of different specifications.

4. The hole enlarging stabilizing device for reverse drilling machine construction according to claim 3, characterized in that: The inner side of the guide channel is provided with a low-friction guide layer, the low-friction guide layer is fixedly arranged on the inner wall of the annular frame body, and corresponds to the position of the outer periphery of the reaming drill rod, so that the reaming drill rod has reduced resistance when rotating and axially moving in the floating stabilizer.

5. The hole enlarging stabilizing device for reverse drilling machine construction according to claim 4, characterized in that: The axial limiting structure comprises a limiting stop ring arranged on the reaming drill rod and a corresponding limiting groove arranged on the floating stabilizer, the limiting stop ring extends into the limiting groove in the radial direction, and the floating stabilizer is limited in the working range between two adjacent limiting stop rings.

6. The hole enlarging stabilizing device for reverse drilling machine construction according to claim 5, characterized in that: The floating stabilizer is arranged on the reaming drill rod behind the reaming drill bit and located in the reaming hole segment formed by the reaming drill rod in the action process, the axial distance between the two adjacent floating stabilizers is set according to the cantilever length of the reaming drill rod and the reaming hole diameter, so that the reaming drill rod forms a segmented radial constraint region distributed in the axial direction in the reaming hole segment, so as to segmentally limit the radial deviation of the reaming drill rod.

7. The hole enlarging stabilizing device for reverse drilling machine construction according to claim 6, characterized in that: The outer limiting contour and the hole wall of the reaming hole segment maintain a radial movement gap when the reaming drill rod is in a normal coaxial state, so as to allow the reaming drill rod to produce normal micro-deviation during rotation and feeding, only when the radial deviation of the reaming drill rod exceeds the radial movement gap, the outer limiting contour and the hole wall of the reaming hole segment form a geometric limiting fit, thereby limiting the further deviation of the reaming drill rod.

8. The hole enlarging stabilizing device for reverse drilling rig construction of claim 1, wherein: The outer limiting contour comprises a plurality of elastic limiting segments arranged on the outer periphery of the annular frame body, the plurality of elastic limiting segments are distributed in the circumferential direction and extend to the radial outer side, so that the floating stabilizer can adapt to the local hole diameter change of the reaming hole segment caused by uneven rock stratum or construction error.

Images