A connection device and a method of installing a wedge bar by a drill

Abstract

The application relates to the technical field of tunnel and underground engineering rock excavation, in particular to a connecting device and a method for installing a splitting rod through a drilling machine. The connecting device comprises a connecting cylinder body, both ends of the connecting cylinder body are provided with connecting sections, and notches are formed in the connecting sections; two hoop rings, the hoop ring comprises two oppositely arranged hoop plates, and the corresponding end portions of the two hoop plates are connected through bolts and nuts to form a ring shape; the two connecting sections of the connecting cylinder body are respectively sleeved with the hoop rings, and the two hoop plates of the hoop ring are respectively located on the two sides of the notches; the bolts and nuts are configured to adjust the distance between the two hoop plates to adjust the size of the hoop ring, the minimum value of the maximum cylinder diameter that can be accommodated by the hoop ring is smaller than the outer diameter of the connecting section, and the maximum value of the maximum cylinder diameter that can be accommodated by the hoop ring is greater than the outer diameter of the connecting section.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel and underground engineering rock excavation, and particularly relates to a connecting device and a method for installing a splitting rod by using a drill machine. BACKGROUND

[0002] At present, the construction technology of urban underground tunnel is more and more strict, therefore, the non-explosive construction method is widely applied in the construction of urban underground tunnel, and has the characteristics of safety, environmental protection and noise reduction, wherein, the splitting rod and the splitting pump station are used to break hard rock, and the splitting rod is installed in the rock surface drilled by the down-the-hole drill machine, which is an important link of the splitting rod and the splitting pump station for breaking hard rock.

[0003] Before this, the splitting rod is mostly installed by manual installation, when the drilling hole of the working face is too high from the ground, the manual installation is very inconvenient, not only needs to invest too much labor cost, but also has great danger and extremely low operation efficiency.

[0004] In addition, although there are some drilling and splitting integrated devices in the market, these devices are mainly designed for open-pit mines, and inevitably have the problems of large device size and poor flexibility, and cannot adapt to the operation requirements of narrow space and accurate contour control in the tunnel.

[0005] The purpose of the present application is to provide an operation method to solve the problem of inconvenient installation of the splitting rod in the construction of underground tunnel. SUMMARY

[0006] In view of the above analysis, the main purpose of the present application is to provide a connecting device for installing the splitting rod on the drill machine, which comprises:

[0007] A connecting cylinder body, both ends of the connecting cylinder body have a connecting section, and a slot is formed on the connecting section;

[0008] Two hoop rings, the hoop ring comprises two oppositely arranged hoop plates, and the corresponding end portions of the two hoop plates are connected by bolts and nuts to form a ring shape;

[0009] The two connecting sections of the connecting cylinder body are respectively sleeved with the hoop ring, and the two hoop plates of the hoop ring are respectively located on the two sides of the slot;

[0010] The bolt and nut are configured to adjust the distance between the two hoop plates to adjust the size of the hoop ring, the minimum value of the maximum cylinder diameter that can be accommodated by the hoop ring is less than the outer diameter of the connecting section, and the maximum value of the maximum cylinder diameter that can be accommodated by the hoop ring is greater than the outer diameter of the connecting section.

[0011] In some embodiments, at least two of the notches are formed on the connecting section, and two of the hoop rings are respectively located on two sides of the at least one notch.

[0012] In some embodiments, two of the notches are formed on the connecting section, and the two notches are oppositely arranged.

[0013] In some embodiments, the hoop ring comprises an arc-shaped section, and two of the ear plates are connected to two ends of the arc-shaped section, the two ear plates are oppositely arranged in parallel with the ear plate of another hoop ring, and a through hole is formed on the ear plate for passing through a bolt.

[0014] In some embodiments, a wire slot is formed in the middle of the connecting cylinder.

[0015] In some embodiments, the splitting rod and the drilling machine are both provided with a connecting part connected with the connecting device, and the connecting section is used for sleeving on the connecting part.

[0016] In some embodiments, the inner diameter of the connecting section is greater than the outer diameter of the corresponding connecting part, and the difference is between 1 to 5 millimeters.

[0017] The present application also provides a method for installing a splitting rod by a drilling machine, comprising the following steps:

[0018] Drilling a pre-positioned hole by a drilling machine;

[0019] Inserting the connecting part at the end of the splitting rod into the connecting section at one end of the connecting device according to any one of the above embodiments, and tightening the corresponding hoop ring to make the connecting device and the splitting rod fixedly connected;

[0020] After completing the drilling, withdrawing the drill rod, inserting the connecting part at the end of the drill rod into the connecting section at the other end of the connecting device, and tightening the corresponding hoop ring to make the splitting rod and the drilling machine fixedly connected through the connecting device;

[0021] Sending the splitting rod into the drilled hole by the drilling machine.

[0022] In some embodiments, after the connecting device and the splitting rod are fixedly connected, the pipeline connected to the splitting rod is pulled out through the wire slot on the connecting device.

[0023] The combination of the innovative construction process and the special connecting device realizes stable connection of the splitting rod and the drill rod of the drilling machine, and then the insertion, extraction, position adjustment and splitting operation of the splitting rod are realized by using the hydraulic arm of the drilling machine, manual work is saved, and the mechanical operation advantage is remarkable, especially for the splitting hole at a higher position. The method has high operation precision, good contour control, greatly improved construction efficiency, good safety, small noise and vibration, effectively improves the construction efficiency and is suitable for the city sensitive environment. Especially suitable for the scene that the city subway tunnel underpasses important buildings, the mountain tunnel portal section construction or the coal mine roadway rock section tunneling and the like space is small and not suitable for complex equipment to enter. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The illustrations, together with the description, serve to explain the application, but not to limit the application. In the drawings:

[0025] Figure 1 The connecting device provided for the embodiment of the application is shown in perspective Figure One ;

[0026] Figure 2 The connecting device provided for the embodiment of the application is shown in perspective Figure Two ;

[0027] Figure 3 The connecting device provided for the embodiment of the application is shown in perspective. DETAILED DESCRIPTION

[0028] In order to make the personnel in the technical field better understand the scheme of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0029] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0030] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0031] In addition, in addition to indicating the orientation or positional relationship, the above-mentioned partial terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific situation.

[0032] In addition, the terms "mount", "set", "provided with", "connected", "connected", "sleeved" should be broadly understood. For example, "connected" can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific situation.

[0033] As shown in Figure 1 and Figure 2 The present application aims to provide a connecting device for mounting a split rod on a drill machine, comprising:

[0034] A connecting cylinder 1, both ends of the connecting cylinder have connecting sections, and notches 3 are formed on the connecting sections;

[0035] Two hoop rings 4, the hoop ring 4 comprises two oppositely arranged hoops, and the corresponding end portions of the two hoops are connected by bolts 5 and nuts 7 to form a ring shape;

[0036] The hoop ring is respectively sleeved on the two connecting sections of the connecting cylinder 1, and the two hoops of the hoop ring 4 are respectively located on the two sides of the notches 3;

[0037] The bolt and nut are configured to adjust the distance between the two hoops to adjust the size of the hoop ring 4, the minimum value of the maximum cylinder diameter that the hoop ring 4 can accommodate is less than the outer diameter of the connecting section, and the maximum value of the maximum cylinder diameter that the hoop ring 4 can accommodate is greater than the outer diameter of the connecting section.

[0038] The design core of the connection device is to achieve quick and reliable connection through simple mechanical structure, while adapting to the operation demand in narrow space. The connection cylinder 1 is usually made of high-strength alloy steel, such as 42CrMo or similar materials, which is heat treated to improve hardness and toughness, to ensure that it is not easy to deform or break under high pressure. The two end connection sections of the connection cylinder are designed as symmetrical structures, which are convenient for bidirectional connection of the split rod and the drill bit of the drilling machine. The outer diameter of the connection section is usually customized according to the standard drill rod size, such as the common diameter of 50mm to 100mm, but it can be adjusted according to the actual application. The function of the notched groove 3 is to allow the connection section to elastically deform when clamped, so as to tightly fit the connection part. The shape of the notched groove can be rectangular, trapezoidal or arc-shaped, and the depth is generally 1 / 3 to 1 / 2 of the cylinder wall thickness, to ensure sufficient flexibility without affecting the overall strength. The clamp plate of the clamp ring 4 is usually made of Q235 or 45 steel, and the surface is galvanized or plastic sprayed to prevent corrosion. The bolts 5 and nuts 7 are high-strength bolts, such as 8.8 or 12.9, with M10 to M16 thread specifications, matched with lock nuts or spring washers to prevent loosening in a vibrating environment. The adjustment principle of the clamp ring 4 is similar to that of a clamp, which tightens the bolts to make the two clamp plates close, reduces the inner diameter of the clamp ring, and thus applies radial pressure to the connection section to achieve fastening. This design allows the clamp ring 4 to adapt to a certain range of cylinder diameter changes, for example, when the outer diameter tolerance of the cylinder is ±2mm, the clamp ring 4 can compensate for the deviation by adjusting. In addition, the concept of "maximum cylinder diameter" of the clamp ring 4 needs further explanation: when the clamp ring 4 is completely loosened, its maximum inner diameter should be greater than the outer diameter of the connection section, so that it can be quickly sleeved; when the clamp ring 4 is completely tightened, its minimum inner diameter should be smaller than the outer diameter of the connection section, so as to generate enough clamping force. The calculation of the clamping force can be based on the bolt pre-tightening force and the friction coefficient, and the clamping force is usually required to be greater than the axial tension in the splitting operation to prevent slipping. In narrow space applications, the overall size of the device is controlled to be 200-300mm in length and 80-120mm in diameter, with a weight of not more than 5kg, which is convenient for manual operation. Compared with traditional welding or flange connection, this device does not require special tools, and the disassembly time can be shortened to minutes, greatly improving the operation efficiency.

[0039] The maximum cylinder diameter that the clamp ring 4 can accommodate refers to the diameter of the sleeved object that can be sleeved without extrusion deformation between the clamp ring 4 and the sleeved object. Through the simple structure configuration of the clamp ring 4 described above, the connection section can be easily clamped on the split rod or drill bit by the clamp ring 4, realizing the fixed connection of the two, and realizing the miniaturization of the connection device and the connection method, without causing a large space burden, to better serve the tunnel operation in narrow space.

[0040] In some embodiments, at least one slot 3 is formed on the connecting segment, and two hoop plates of the hoop ring 4 are respectively located on both sides of the at least one slot 3.

[0041] It should be understood that, in some embodiments, the number of slots 3 on the connecting segment can be at least one, and in order to better allow the connecting segment to deform slightly, the number of slots 3 can be set to be multiple, but in order to facilitate the deformation of the connecting segment by the hoop ring 4, the two hoop plates should be respectively located on both sides of the at least one slot 3.

[0042] The number and layout of the slots 3 have a significant impact on the deformation ability of the connecting segment and the clamping effect. The design of a single slot 3 is suitable for low-load scenarios, such as when the splitting rod is light in weight or has little vibration. The width of the slot 3 is usually 2mm to 5mm, and the length extends axially along the connecting segment, covering 50% to 80% of the length of the connecting segment, to ensure uniform deformation. When multiple slots 3 are provided, for example, 2 to 4, the slots 3 can be uniformly distributed or asymmetrically distributed in the circumferential direction to optimize stress distribution. Multiple slots 3 can increase the flexibility of the connecting segment, make the clamping force more uniform, reduce local stress concentration, and prolong the service life of the device. The position of the hoop plate of the hoop ring 4 must cover both sides of at least one slot 3, so that when the bolt is tightened, the pressure exerted by the hoop plate on the connecting segment will be converted into radial contraction through the slot 3, thereby clamping the connecting part. If the hoop plate is not aligned with the slot 3, it may cause uneven deformation of the connecting segment, affecting the sealing and stability. In actual tests, finite element analysis (FEA) simulation shows that the maximum stress of a single slot 3 is concentrated at the bottom of the slot when clamping, while multiple slots 3 can reduce the peak stress by more than 20%. In addition, the ends of the slot 3 should be designed with rounded or chamfered corners to avoid stress cracks. For high-vibration environments, multiple slots 3 can be used in combination with rubber or polyurethane gaskets placed between the connecting segment and the connecting part to enhance damping and sealing.

[0043] In some embodiments, two slots 3 are formed on the connecting segment, and the two slots are oppositely arranged. Figure 1 and Figure 2 As shown in the drawings, the structure of two oppositely arranged slots 3 and two oppositely arranged hoop plates is a more optimal matching way, which facilitates the clamping of the connecting segment and the connecting part.

[0044] In some embodiments, the hoop plate includes an arc-shaped segment, and the two ends of the arc-shaped segment are connected with ear plates, the ear plates are arranged in parallel and opposite to the ear plates of the other hoop plate in the hoop ring 4, and a through hole 6 is formed on the ear plate, and the through hole 6 is used for passing through the bolt 5.

[0045] The structure design of the hoop plate directly affects the adjustment convenience and stress uniformity. The outer shape of the arc segment matches the connecting segment, and the curvature radius is slightly larger than the outer diameter of the connecting segment, for example, 1 mm to 2 mm larger, to ensure sufficient gap when initially sleeving. The arc length of the arc segment usually covers 60% to 80% of the circumference of the connecting segment, providing sufficient contact area. The ear plate is designed as a rectangle or a trapezoid, with a thickness consistent with that of the arc segment, usually 8 mm to 12 mm, and the diameter of the through hole 6 is slightly larger than the diameter of the bolt, for example, when the bolt is M12, the diameter of the through hole 6 is 13 mm, to allow for slight adjustments. A circular arc transition is used at the connection between the ear plate and the arc segment to reduce stress concentration. The bolt 5 passes through the through hole 6 of the two ear plates and is locked by the nut 7. In actual operation, the tightening torque of the bolt 5 is determined according to the bolt specification and material, for example, the recommended torque for an M12 bolt is 50 N·m to 80 N·m, and the use of a torque wrench can ensure consistency. The inner surface of the arc segment can be processed with anti-slip patterns or pasted with friction pads, such as rubber or copper-based pads, to increase the coefficient of friction and prevent relative sliding. This hoop plate structure is simple and reliable, with low manufacturing cost, suitable for mass production.

[0046] In some embodiments, a through slot 2 is provided in the middle of the connecting cylinder. After the connecting device and the splitting rod are fixed, the upper connecting pipeline of the splitting rod can be pulled out through the through slot 2 on the connecting device.

[0047] The through slot 2 is a practical feature of the present application, used to manage the hydraulic or electrical pipelines of the splitting rod. The through slot 2 is usually located in the middle of the connecting cylinder 1, shaped as a U or rectangle, with a width of 10 mm to 20 mm and a length extending along the axial direction, covering 30% to 50% of the length of the cylinder. The slot edge is rounded to avoid scratching the pipeline. The pipeline includes hydraulic hoses, sensor cables or data lines, and the through slot 2 allows these pipelines to be pulled out from the inside of the connecting device and connected to the external control system. This design avoids the pipeline being squeezed or tangled during operation, improving reliability. After threading, the pipeline can be fixed with a cable tie or adhesive tape to prevent loosening. The position of the through slot 2 is optimized to ensure that the pipeline is not excessively bent when the connecting device rotates or moves. In addition, the through slot 2 can also serve as a lightening hole to reduce the weight of the connecting device, facilitating transportation. For harsh environments, the through slot 2 can be equipped with a protective cover or a sealing rubber ring to prevent dust or water from entering.

[0048] In some embodiments, the splitting rod and the drilling machine both have a connecting part connected to the connecting device, and the connecting segment is used to sleeve on the connecting part.

[0049] The connecting part is the interface part of the splitting rod and the drill rod, which is usually cylindrical, and the outer diameter is designed according to the standard, for example, the outer diameter of the drill rod connecting part is 60-90 mm. The surface finish of the connecting part is required to be high, usually above Ra3.2, to ensure good contact with the inner wall of the connecting section. The connecting part can have a keyway or a thread, but the design is achieved by clamping, without additional structure, simplifying the processing. When the connecting section is sleeved on the connecting part, the initial gap (i.e. the difference between the inner diameter of the connecting section and the outer diameter of the connecting part) is a key parameter, which will be described in detail below. This sleeving method allows quick docking, especially when space is limited, the operator does not need to align accurately to initially install, and then fix by clamping. The material of the connecting part is usually matched with the connecting cylinder, such as 40Cr or similar alloy steel, with a heat treatment hardness of HRC30-40, to resist wear.

[0050] In some embodiments, the inner diameter of the connecting section is greater than the outer diameter of the corresponding connecting part, with a difference of 1-5 mm. It should be understood that in order to facilitate the sleeving of the connecting section on the connecting part, the inner diameter of the connecting section should be slightly larger than the outer diameter of the connecting part, but not too large.

[0051] The difference between the inner diameter of the connecting section and the outer diameter of the connecting part (i.e. the gap) is a key design, which directly affects the installation convenience and clamping effect. If the gap is too small (less than 1 mm), it will be difficult to sleeve, especially in a dusty environment or with slight deformation; if the gap is too large (more than 5 mm), the clamping plate 4 needs to produce larger deformation to hold tightly, which may cause plastic deformation of the connecting section or insufficient holding force. Through engineering calculation, the optimal gap is 2-3 mm, at which the contact pressure distribution is uniform after clamping, and a certain centering error is allowed. The selection of the gap also needs to consider the thermal expansion effect, for example, in high temperature operation, the gap needs to be slightly larger to compensate for thermal deformation. In practical application, the inner diameter tolerance of the connecting section is controlled at H7 level, and the outer diameter tolerance of the connecting part is controlled at g6 level, to ensure that the gap is within the target range. In addition, the inner wall of the connecting section can be coated with grease or Teflon coating to reduce friction and facilitate installation and disassembly.

[0052] The present application also provides a method for installing a splitting rod by a drill rig, comprising the following steps:

[0053] Drilling the pre-positioned hole by the drill rig;

[0054] As shown in Figure 3 The connecting part of the end 9 of the splitting rod is inserted into the connecting section of one end of the connecting device as described in any of the above embodiments, and the corresponding clamping plate is tightened to fix the connecting device and the splitting rod;

[0055] After the drilling is completed, the drill rod is withdrawn, the connecting portion of the drill rod end 8 is inserted into the connecting segment of the other end of the connecting device, and the corresponding hoop ring is tightened to enable the splitting rod to be fixed to the drill rig through the connecting device and the drill rig.

[0056] The splitting rod is fed into the drill hole by the drill rig.

[0057] Specifically, the present application employs a rotary drill rig to work in cooperation with a hydraulic splitting rod, and utilizes a connecting device to quickly install the splitting rod to the drill rod of the rotary drill rig.

[0058] Pre-construction preparation: including geological survey and analysis, three-dimensional hole design optimization based on BIM technology, and equipment commissioning and inspection.

[0059] The geological survey includes core sampling and strength testing to determine the uniaxial compressive strength of rock and the development of cracks. The three-dimensional hole design based on BIM technology uses software such as Revit or Navisworks to simulate the layout of the drill holes, optimize the hole spacing and depth, and reduce overbreak or underbreak. The hole spacing is usually 2-3 times the diameter of the rock splitting rod, for example, when the diameter of the splitting rod is 50 mm, the hole spacing is set to 100 mm to 150 mm. The equipment commissioning and inspection includes the hydraulic system of the rotary drill rig, the wear condition of the drill rod, and the calibration of the hydraulic pump and controller of the splitting rod.

[0060] Precise positioning of the drill hole: operate the rotary drill rig to drill according to the optimized hole design, and the drilling sequence follows the principle of "first inside and then outside, first down and then up".

[0061] The rotary drill rig adopts a GPS or laser guidance system, with a positioning accuracy of ±5 mm. The drilling sequence "first inside and then outside, first down and then up" means drilling from the center of the tunnel to the periphery and from the bottom to the top to avoid interference from the debris. The drilling depth is usually 1 m to 3 m according to the design, and the drilling diameter is slightly larger than the diameter of the splitting rod, for example, by 5 mm to 10 mm, to facilitate insertion. Water or air cooling is used during drilling to reduce dust.

[0062] Quick conversion of operation mode: after the drilling is completed, the splitting rod is installed to the head of the drill rod using the connecting device, realizing the quick mechanical connection of the splitting rod and the drill rod.

[0063] After the drilling is completed, the drill rod is withdrawn, and the operator manually or through a mechanical arm connects one end of the connecting device to the splitting rod. When tightening the hoop ring, a torque wrench is used to ensure that the bolts reach the predetermined torque, for example, 60 N·m. Then, the other end of the connecting device is sleeved to the head of the drill rod, and the hoop ring is also tightened. The entire process can be completed within 2-3 minutes, which is much faster than traditional bolt connection or welding.

[0064] Precise insertion of the splitting rod: operate the drill rig to accurately insert the connected splitting rod into the drill hole.

[0065] The drill rig manipulates the splitting rod to align with the borehole, slowly inserting at a speed controlled between 0.1 m / s and 0.5 m / s to avoid hitting the borehole wall. The insertion depth is controlled by the drill rig scale or sensors to ensure the splitting rod reaches the borehole bottom.

[0066] Staged pressurization splitting: Start the hydraulic system with a staged pressurization method including an initial pressure stage, a working pressure stage, and a pressure holding stage for rock splitting; wherein the specific parameters of the staged pressurization splitting are: the initial pressure stage is 5-10 MPa, the working pressure stage gradually increases to 25-35 MPa, and the pressure holding stage lasts for 10-15 seconds.

[0067] After the hydraulic system is started, the initial pressure stage (5-10 MPa) causes the splitting rod to slightly expand, adapting to the borehole wall; the working pressure stage (25-35 MPa) gradually increases the pressure to generate radial force to break the rock; the pressure holding stage (10-15 seconds) maintains the pressure to ensure the crack fully expands. The pressure parameters are adjusted according to the rock strength, for example, for hard granite, the working pressure can be increased to 40 MPa. The hydraulic system is equipped with a safety valve to prevent overloading.

[0068] Sequential splitting operation: Splitting is performed in the order of the undercutting area, the auxiliary area, and the peripheral area, and the debris is cleaned in time.

[0069] The undercutting area is split first to create a free surface; the auxiliary area expands the crack; and the peripheral area controls the profile. After splitting, the debris is cleaned using a shovel or a vacuum system, and the operation is repeated. This method reduces blasting vibration, with noise lower than 80 dB, suitable for urban environments.

[0070] In some embodiments, when the uniaxial compressive strength of the rock is greater than 80 MPa, a "pre-split-main split" two-step splitting process is adopted, that is, a small pressure pre-splitting is first performed at the bottom of the hole to form an initial crack, and then a full pressure splitting is performed.

[0071] For high-strength rocks (such as basalt or quartzite), one-time splitting may be inefficient or overload the equipment. The "pre-split-main split" process optimizes fragmentation through two-step operation: the pre-splitting stage uses lower pressure, for example, 10-15 MPa, for 5-10 seconds, to form microcracks at the bottom of the hole and weaken the rock structure; the main splitting stage applies full pressure, for example, 30-40 MPa, to expand the pre-splitting cracks and achieve efficient fragmentation. This process reduces energy consumption, prolongs the service life of the splitting rod, and improves the uniformity of the fragmentation size. The pre-splitting pressure and time can be programmed and set by the hydraulic controller to adapt to different rock layers. Field tests show that two-step splitting is more than 20% more efficient than one-time splitting, and reduces the risk of rod jamming.

[0072] In some embodiments, after the connecting device and the splitting rod are fixedly connected, the upper connected pipeline of the splitting rod is threaded out through the threading slot on the connecting device.

[0073] Pipe management is critical for job safety. The pipe for the wedge bar typically includes hydraulic hoses (carrying high pressure oil) and control cables (transmitting signals). After being attached, the pipe exits the threading slot 2, runs along the drill pipe, and is secured to the rig body. Sharp bends are avoided during threading, with a bend radius greater than 5 times the pipe diameter to prevent damage. The pipe can be color-coded or labeled for easy identification. In a vibrating environment, a buffer sleeve is added after the pipe passes through the threading slot 2 to reduce wear and tear. In addition, the versatility of the threading slot 2 allows multiple pipes to be threaded simultaneously, such as dual hydraulic lines or sensor lines, supporting complex operations.

[0074] The present application realizes the stable connection of the wedge bar and the drill pipe of the drilling machine by combining innovative construction technology with special connecting devices, and then realizes the insertion, extraction, position adjustment and splitting operation of the wedge bar by using the hydraulic arm of the drilling machine, saving manual work, especially for higher position splitting holes, the mechanical operation advantage is remarkable. The method has high operation precision, good contour control, and greatly improved construction efficiency, and is safe, has small noise and vibration, effectively improves the construction efficiency and is suitable for urban sensitive environment. Especially suitable for urban subway tunnel under important buildings, mountain tunnel portal section construction or coal mine roadway rock section excavation and other scenes where complex equipment cannot enter.

[0075] The advantage of the present application is its integration and adaptability. The miniaturized design of the connecting device makes it easy to operate in a narrow space (such as a tunnel section less than 10 m²), while traditional equipment often requires more installation space. Mechanical connection reduces manual intervention, reduces accident risk, and meets mine safety standards. In noise sensitive areas (such as near residential areas), this method replaces blasting, and the noise level can be controlled below 75 dB.

[0076] In addition, the device can be integrated with an automated system to monitor the connection status and splitting parameters through sensors, enabling data recording and remote control. Future upgrades can include a smart hoop ring with a pressure sensor to provide real-time feedback on the gripping force, or the use of lightweight materials such as titanium alloys to further reduce weight. Overall, the present application solves complex problems with simple structure, improving the reliability and economy of the entire construction process.

[0077] It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0078] Obviously, those skilled in the art should understand that the units or steps of the present application described above can be realized by universal computing devices, and they can be centralized on a single computing device or distributed on a network composed of multiple computing devices. Alternatively, they can be realized by program codes executable by the computing devices, so that they can be stored in storage devices and executed by the computing devices, or they can be respectively manufactured into individual integrated circuit modules, or multiple modules or steps among them can be manufactured into a single integrated circuit module to realize. Thus, the present application is not limited to any particular combination of hardware and software.

[0079] The preferred embodiments of the present application are described above, but the present application is not limited to the above. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A connecting device, characterized in that, The connecting device is used to mount the splitting rod on the drilling machine, including: A connecting cylinder, wherein both ends of the connecting cylinder have connecting sections, and the connecting sections are provided with slots; The ring consists of two opposing hoop plates, the ends of which are connected by bolts and nuts to form a ring shape. The connecting cylinder is fitted with a hoop ring on each of its two connecting sections, and the two hoops of the hoop ring are located on both sides of the groove. The bolt and nut are configured to adjust the distance between the two clamping plates to adjust the size of the clamping plate ring. The minimum maximum cylinder diameter that the clamping plate ring can accommodate is less than the outer diameter of the cylinder of the connecting section, and the maximum maximum cylinder diameter that the clamping plate ring can accommodate is greater than the outer diameter of the cylinder of the connecting section. Both the splitting rod and the drilling machine have a connecting part that connects to the connecting device, and the connecting section is used to be sleeved on the connecting part; The inner diameter of the connecting section is larger than the outer diameter of the corresponding connecting part, with a difference between 1 and 5 millimeters.

2. The connecting device according to claim 1, characterized in that: The connecting section has at least two slots, and the two hoops of the hoop ring are respectively located on both sides of at least one of the slots.

3. The connecting device according to claim 1, characterized in that: The connecting section has two slots, which are arranged opposite to each other.

4. The connecting device according to claim 1, characterized in that: The hoop includes an arc-shaped segment, with ear plates connected to both ends of the arc-shaped segment. The ear plates are arranged parallel to and opposite to the ear plates of another hoop in the hoop ring. The ear plates have through holes for passing through bolts.

5. The connecting device according to claim 1, characterized in that: A wire-threading groove is provided in the middle of the connecting cylinder.

6. A method for installing a splitting rod using a drilling machine, characterized in that, Includes the following steps: Drill holes in the pre-positioned locations using a drilling machine; Insert the connecting part at the end of the splitting rod into the connecting section at one end of the connecting device as described in any one of claims 1-5, and tighten the corresponding hoop ring to fix the connecting device and the splitting rod together. After drilling is completed, the drill rod is removed, and the connecting part at the end of the drill rod is inserted into the connecting section at the other end of the connecting device. The corresponding hoop ring is tightened so that the splitting rod is fixedly connected to the drilling machine through the connecting device. The splitting rod is fed into the borehole using the drilling machine.

7. The method for installing a splitting rod using a drilling machine according to claim 6, characterized in that: After the connecting device and the splitting rod are fixed together, the pipeline connected to the upper part of the splitting rod is passed through the threading groove on the connecting device.

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