A high-efficiency grouting device for fault grouting in coal mines

Abstract

This invention provides a high-efficiency grouting device for coal mine fault grouting, applied in the field of grouting anchor technology. The device includes a rod body, rod head, rod tail, and clamping end, as well as a grouting channel extending through them. By inserting a core rod into the grouting channel within the rod body, rod head, and rod tail, and simultaneously clamping and connecting the clamping end and core rod during drilling, the rotational power during drilling can be provided by the core rod, effectively ensuring the structural strength of the device during drilling. This allows for a suitable reduction in the wall thickness of the rod body, rod head, and rod tail, thereby significantly increasing the diameter of the grouting channel. This effectively improves the efficiency of grouting using the grouting channel, facilitating efficient coal mine fault grouting construction.

Description

Technical Field

[0001] This application relates to the field of grouting anchor technology, and in particular to a high-efficiency grouting device for fault grouting in coal mines. Background Technology

[0002] In coal mining operations, faults are common geological structures that can easily cause safety hazards such as water inrush and roof collapse. Therefore, grouting technology is needed to reinforce and seal the fault fracture zone to improve the stability of the surrounding rock. Among existing technologies, self-drilling hollow grouting anchor bolts have been widely used in coal mine fault grouting scenarios because they combine drilling and grouting functions and do not require secondary pipe insertion.

[0003] However, existing self-drilling hollow grouting anchor bolts have significant technical limitations. Their design must prioritize meeting the torsional and compressive strength requirements of the bolt body during drilling. This requires the bolt body to have sufficient wall thickness to withstand the impact and torque of external forces during drilling. Due to the limitations of the overall size of the bolt body, the increase in wall thickness directly squeezes the space of the internal hollow grouting channel, resulting in a generally small channel diameter. This makes the grout flow resistance high during grouting, especially when the grout viscosity is high or it contains aggregate, which can easily lead to slowed flow rate and channel blockage, resulting in low efficiency of coal mine fault grouting construction.

[0004] Therefore, a high-efficiency grouting device for coal mine fault grouting is proposed to solve some of the problems existing in the above-mentioned prior art. Summary of the Invention

[0005] The purpose of this application is to improve the grouting efficiency of self-drilling hollow grouting anchor bolts. Compared with the prior art, it provides a high-efficiency grouting device for fault grouting in coal mines, including a rod body, a rod head connected to the lower end of the rod body, and a drill bit fixedly installed at the lower end of the rod head. A rod tail connected to the upper end of the rod body, and a clamping end fixedly installed at the upper end of the rod tail. A grouting channel is formed through the rod body, rod head, rod tail, and clamping end. A grout outlet hole communicating with the grouting channel is formed on the cylindrical surface of the rod head. A support plate and a grout stop plug are movably sleeved on the outer side of the rod tail. The grout stop plug is fixedly installed on the side of the support plate near the rod body. A nut is rotatably connected to the side of the grout stop plug near the clamping end, and the nut is threaded on the outer side of the rod tail. A core is slidably inserted in the grouting channel, and the upper end of the core protrudes out of the outer side of the clamping end.

[0006] Furthermore, there are four slurry outlet holes, which are symmetrically arranged in pairs on the cylindrical surface of the rod head, and are staggered vertically.

[0007] Furthermore, a screw is fixedly installed at the lower end of the rod body and the rod tail, and a screw cylinder is fixedly installed at the upper end of the rod body and the rod head, with the threads on the outside of the screw and the threads on the inside of the screw cylinder meshing properly.

[0008] Furthermore, the column core is composed of multiple square rods spliced ​​together. The outer dimensions of the square rods are adapted to the inner dimensions of the grouting channel. The upper end of the square rod is provided with a slot, and the lower end of the square rod is fixedly installed with a plug block adapted to the inner dimensions of the slot. The outer end wall of the plug block is provided with a hole, and a first ball is movably installed in the hole. A spring for elastic support of the first ball is fixed in the hole. The inner end wall of the slot is provided with a first groove adapted to the first ball.

[0009] Furthermore, a through hole is provided on the inner end wall of the slot, extending through to the outer end wall of the square rod, and a second ball is movably installed in the through hole. A second groove adapted to the second ball is provided on the inner end wall of the insert block.

[0010] Furthermore, a spiral blade is fixedly installed on the rod head, coaxially arranged with it, and the spiral blade is located between the drill bit and the slurry outlet, with the spiral blade protruding on the outside of the drill bit.

[0011] Furthermore, the outer diameter of the spiral blade gradually increases from bottom to top, and a storage groove corresponding to the spiral blade is provided on the rod head.

[0012] Furthermore, reinforcing ribs are fixedly mounted on the cylindrical surfaces of the shaft and the head, and the reinforcing ribs are designed with a spiral structure, with the spiral extension direction of the reinforcing ribs consistent with the direction of the drill bit's drilling rotation.

[0013] Furthermore, a column is fixedly connected between the rod tail and the clamping end, and a cavity coaxially arranged with the grouting channel is opened in the column. Both the upper and lower ends of the cavity are connected to the grouting channel. A connecting hole communicating with the inside of the cavity is opened on the cylindrical surface of the column. Two symmetrically arranged valve plates are rotatably installed at the upper position inside the cavity, and a torsion spring is installed at the rotatable connection of the valve plates.

[0014] Furthermore, an adapter box is rotatably fitted onto the outer side of the column, and a pipe connector communicating with its interior is fixedly installed on the adapter box.

[0015] Compared to existing technologies, the advantages of this application are:

[0016] (1) This application inserts the core into the grouting channel opened in the rod body, rod head and rod tail, and clamps and connects the clamping end and the core synchronously during the drilling process, so that the rotational power of the device during the drilling process can be provided by the core, which effectively ensures the structural strength of the device during drilling, thereby allowing the wall thickness of the rod body, rod head and rod tail to be appropriately reduced, thereby greatly increasing the diameter of the grouting channel, which can effectively improve the efficiency of the device when using the grouting channel for grouting, and facilitates the realization of efficient coal mine fault grouting construction.

[0017] (2) By fixing the screw to the lower end of the rod body and the rod tail, and fixing the screw barrel that is compatible with the screw to the upper end of the rod body and the rod head, the device can flexibly select the appropriate number of rod bodies for assembly according to the actual grouting depth requirements in the coal mine fault, and flexibly adjust the length of the device during actual use, which facilitates the modular production and use of the device, effectively improves the applicability of the device, and helps to reduce the cost of grouting construction.

[0018] (3) The column core is formed by splicing multiple square rods, so that the internal support of the column core can be adapted to the flexible adjustment of the length of the device. By installing the first ball in the hole and using the spring for elastic support, the two adjacent square rods can be pre-connected. At the same time, by using the second ball rolling between the through hole and the second groove, the two adjacent square rods can be completely locked after the column core is inserted into the grouting channel, ensuring the stability of the column core being pulled outward. Attached Figure Description

[0019] Figure 1 This is a perspective view of the drilling process in this application;

[0020] Figure 2 This is a breakdown diagram of the grouting process in this application;

[0021] Figure 3 This is an exploded view of the column, valve plate, and adapter box of this application;

[0022] Figure 4 This is a split diagram of the core of this application;

[0023] Figure 5 For this application Figure 1 A front view of the structure;

[0024] Figure 6 For this application Figure 5 Sectional view at point AA;

[0025] Figure 7 For this application Figure 1 Front sectional view of the middle structure;

[0026] Figure 8 For the present invention Figure 7 Enlarged view of point B in the middle;

[0027] Figure 9 For the present invention Figure 1 Side sectional view of the middle structure;

[0028] Figure 10 For the present invention Figure 9 Enlarged view of point C in the middle.

[0029] Explanation of the labels in the diagram:

[0030] 1. Rod body; 101. Rod head; 102. Drill bit; 103. Rod tail; 104. Clamping end; 105. Grouting channel; 106. Grout outlet hole; 107. Support plate; 108. Grout stop plug; 109. Nut; 2. Screw; 201. Screw barrel; 3. Core; 4. Square rod; 401. Slot; 402. Insert block; 403. Hole; 404. First ball bearing; 405. Spring; 406. First groove; 407. Through hole; 408. Second ball bearing; 409. Second groove; 5. Spiral blade; 501. Receiving groove; 6. Reinforcing rib; 7. Column; 701. Cavity; 702. Connecting hole; 703. Valve plate; 704. Torsion spring; 8. Adapter box; 801. Pipe joint. Detailed Implementation

[0031] The embodiments will be described clearly and completely with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application. Example

[0032] This invention provides a high-efficiency grouting device for fault grouting in coal mines. Please refer to [link / reference]. Figure 1 - Figure 10 The rod includes a rod body 1, with a rod head 101 connected to the lower end of the rod body 1. A drill bit 102 is fixedly installed at the lower end of the rod head 101. A rod tail 103 is connected to the upper end of the rod body 1, with a clamping end 104 fixedly installed at the upper end of the rod tail 103. A grouting channel 105 is formed through the rod body 1, rod head 101, rod tail 103, and clamping end 104. A grout outlet hole communicating with the grouting channel 105 is formed on the cylindrical surface of the rod head 101. 106. A support plate 107 and a grout stop plug 108 are movably sleeved on the outer side of the rod tail 103. The grout stop plug 108 is fixedly installed on the side of the support plate 107 near the rod body 1. A nut 109 is rotatably connected to the side of the grout stop plug 108 near the clamping end 104. The nut 109 is threaded on the outer side of the rod tail 103. A core 3 is slidably inserted in the grouting channel 105. The upper end of the core 3 protrudes out of the outer side of the clamping end 104.

[0033] When using this device, workers use it to perform grouting operations on coal mine faults. The device is installed on a drilling device, so that the clamping end 104 and the end of the core 3 are clamped and fixed by the chuck on the drilling device. Then, the drilling device drives the device to rotate. With the cutting generated by the rotation of the drill bit 102 and the continuous feeding operation, the device automatically drills into the interior of the coal mine fault, eliminating the need to pre-drill holes at the coal mine fault and improving work efficiency.

[0034] After the device drills into the target location inside the coal mine fault, the drilling device is disconnected from the device. Then, the operator applies a pulling force from the exposed end of the core 3 to pull the core 3 out of the grouting channel 105. The operator adjusts the position of the support plate 107 so that the grout stop plug 108 tightly seals the borehole port. Then, the position of the support plate 107 is fixed by screwing the nut 109 and the rod tail 103 together to ensure the stability of the device inserted into the coal mine fault. Then, the operator continuously injects grout into the grouting channel 105. The grout is injected along the grouting channel 105 and discharged through the grout outlet 106, injecting into the deep part of the coal mine fault, completing the efficient grouting operation of the coal mine fault.

[0035] Because the core 3 is inserted into the grouting channel 105 opened in the rod body 1, rod head 101 and rod tail 103, and the clamping end 104 and the exposed end of the core 3 are clamped and connected by the drilling device during the drilling process, the rotational power of the device during drilling can be provided by the core 3. With the filling support of the core 3, the structural strength of the device during drilling can be effectively guaranteed. This allows the wall thickness of the rod body 1, rod head 101 and rod tail 103 to be appropriately reduced during the manufacturing of the device, thereby greatly increasing the diameter of the grouting channel 105. This greatly improves the efficiency of grouting when using the grouting channel 105, and realizes efficient coal mine fault grouting construction.

[0036] Please see Figure 1 , Figure 5 , Figure 7 and Figure 9 Four grout outlet holes 106 are provided, symmetrically arranged in pairs on the cylindrical surface of the rod head 101. The four grout outlet holes 106 are staggered vertically. When the device is in use, the four grout outlet holes 106, which are connected to the grouting channel 105, are arranged around the cylindrical surface of the rod head 101, and the four grout outlet holes 106 are distributed in four different directions. This allows the workers to guide the grout in different directions when using the device for grouting inside the coal mine fault. This can effectively improve the comprehensiveness and efficiency of grout injection into the coal mine fault, and avoid the grout outlet holes 106 being blocked inside the coal mine fault, thus affecting the grouting speed. At the same time, by staggering the four grout outlet holes 106 vertically, the four grout outlet holes 106 are not located on the same radial direction on the end wall of the rod head 101. This can effectively reduce the impact of multiple grout outlet holes 106 on the structural strength of the rod head 101, and help ensure the structural stability of the device during actual use.

[0037] Please see Figure 1 , Figure 2 and Figure 7A screw 2 is fixedly installed at the lower end of the rod body 1 and the rod tail 103, and a screw cylinder 201 is fixedly installed at the upper end of the rod body 1 and the rod head 101. The thread on the outer side of the screw 2 is properly engaged with the thread on the inner side of the screw cylinder 201. When the device is in use, the screw 2 fixedly installed at the lower end of the rod tail 103 can be threadedly screwed into the screw cylinder 201 fixedly installed at the upper end of the rod body 1, or it can be threadedly screwed into the screw cylinder 201 fixedly installed at the upper end of the rod head 101. The screw 2 fixedly installed at the lower end of the rod body 1 can be threaded into the screw cylinder 201 fixedly installed at the upper end of the rod head 101. Alternatively, it can be screwed onto the upper end of another rod 1 and threaded onto the upper end of the screw cylinder 201. Through the above structural design, the device can flexibly select an appropriate number of rods 1 for assembly according to the actual grouting depth requirements in coal mine faults. The length of the device can be flexibly adjusted during actual use, enabling modular production and flexible assembly. This not only effectively expands the applicability of the device but also effectively reduces the cost of grouting at different depths in coal mine faults, which is conducive to achieving energy-saving construction.

[0038] Please see Figure 4 , Figure 7 and Figure 9 The column core 3 is composed of multiple square rods 4 spliced ​​together. The outer dimensions of the square rods 4 are adapted to the internal dimensions of the grouting channel 105. The upper end of the square rod 4 is provided with a slot 401. The lower end of the square rod 4 is fixedly installed with a plug 402 adapted to the internal dimensions of the slot 401. The outer end wall of the plug 402 is provided with a hole 403, and a first ball bearing 404 is movably installed in the hole 403. A spring 405 for elastically supporting the first ball bearing 404 is fixed in the hole 403. The inner end wall of the slot 401 is provided with a first groove 406 adapted to the first ball bearing 404. The inner end wall of the slot 401 is provided with a through hole 407 extending to the outer end wall of the square rod 4, and a second ball bearing 408 is movably installed in the through hole 407. The inner end wall of the plug 402 is provided with a second groove 409 adapted to the second ball bearing 408.

[0039] To accommodate flexible assembly and adjustment of the device's length during use, the core 3 is also designed for flexible assembly and adjustment. In this device, the core 3 is formed by splicing together multiple identical square rods 4. A plug 402 fixedly installed at the lower end of each square rod 4 can smoothly insert into a slot 401 opened at the upper end of another square rod 4. The outer dimensions of the plug 402 match the inner dimensions of the slot 401. Under normal conditions, supported by the elasticity of the spring 405, the first ball bearing 404 protrudes from the outer side of the end wall of the slot 401. When inserted… During the insertion of block 402 into slot 401, the inner wall of slot 401 will squeeze the first ball 404, causing the first ball 404 to overcome the elastic support of spring 405 and be concealed in hole 403. When the insert block 402 and slot 401 are in place, the first ball 404 is aligned with the first groove 406. At this time, the squeezing of the first ball 404 by the inner wall of slot 401 is removed, and under the elastic support of spring 405, the first ball 404 is embedded in the first groove 406, pre-connecting the two adjacent square rods 4.

[0040] Based on the actual length of the device during use, a suitable number of square rods 4 are selected to assemble a matching core 3. The outer dimensions of the square rods 4 are matched with the inner dimensions of the grouting channel 105. During the process of inserting the core 3 into the grouting channel 105, the inner end wall of the grouting channel 105 will squeeze the second ball 408, causing the second ball 408 to move into the through hole 407 and finally engage between the through hole 407 and the second groove 409. In this state, the through hole 407, the second ball 408 and the second groove 409 are rigidly connected, so that the two adjacent square rods 4 will not separate in the grouting channel 105 after being connected, thereby ensuring the structural stability of the core 3 when it is pulled out of the grouting channel 105.

[0041] In this device, the length of the grouting channel 105 opened in the rod head 101 is only half the length of the grouting channel 105 opened in the rod body 1. This ensures that after the column core 3 is fully inserted into the grouting channel 105 in the device, the connection position of the two adjacent square rods 4 is always in the middle position within each grouting channel 105. This results in the splicing part of the square rod 4 in the column core 3 being misaligned with the splicing parts of the rod body 1, the rod head 101, and the rod tail 103. With this mutual cooperation, the structural strength of the device can be further guaranteed during actual use.

[0042] Please see Figure 1 and Figure 5A spiral blade 5 is fixedly installed on the rod head 101, coaxially arranged with it. The spiral blade 5 is located between the drill bit 102 and the grout outlet 106. The spiral blade 5 protrudes from the outside of the drill bit 102, and the outer diameter of the spiral blade 5 gradually increases from bottom to top. A receiving groove 501 corresponding to the spiral blade 5 is opened on the rod head 101. When the device is used, after the device is driven to drill into the coal mine fault by rotation, the spiral engagement of the spiral blade 5 allows the end of the rod head 101 to form a stable connection with the coal mine fault. This can effectively improve the stability of the device when drilling into the coal mine fault for grouting. By opening the receiving groove 501 at the position corresponding to the spiral blade 5, the debris formed by the drill bit 102 can be temporarily stored in the receiving groove 501 during the drilling process, reducing the probability of soil and rock debris clogging the end of the drill bit 102. This helps to ensure the stability and smoothness of the device when drilling deep into the coal mine fault by rotation.

[0043] Please see Figure 1 A reinforcing rib 6 is fixedly mounted on the cylindrical surface of the rod body 1 and the rod head 101. The reinforcing rib 6 is set as a spiral structure. The spiral extension direction of the reinforcing rib 6 is consistent with the drilling rotation direction of the drill bit 102. When the device is in use, by fixing the spiral structure reinforcing rib 6 around the cylindrical surface of the rod body 1 and the rod head 101, the reinforcing rib 6 can provide radial support to the rod body 1 and the rod head 101 during the rotation drilling process, thereby further improving the structural stability of the device in actual use.

[0044] Please see Figure 2 , Figure 3 and Figure 6 - Figure 7 A column 7 is fixedly connected between the rod tail 103 and the clamping end 104. A cavity 701 coaxially arranged with the grouting channel 105 is opened in the column 7. Both the upper and lower ends of the cavity 701 are connected to the grouting channel 105. A connecting hole 702 communicating with the inside of the cavity 701 is opened on the cylindrical surface of the column 7. Two symmetrically arranged valve plates 703 are rotatably installed at the upper position inside the cavity 701. A torsion spring 704 is installed at the rotatable connection of the valve plates 703. An adapter box 8 is rotatably sleeved on the outside of the column 7. A pipe joint 801 communicating with its inside is fixedly installed on the adapter box 8.

[0045] When using this device, during the grouting construction inside the coal mine fault, the pipe joint 801 is connected to the grout supply device. Under the delivery of the grout supply device, the grout enters the transfer box 8 through the pipe joint 801, and then enters the cavity 701 through the connection hole 702, and is finally delivered to the grouting channel 105. It is then introduced into the inside of the coal mine fault through the grout outlet hole 106. During this process, since the transfer box 8 is rotated and sleeved on the outside of the column 7, the rotation of the rod body 1, rod head 101 and rod tail 103 will not interfere with the connection of the grout supply device. The pipe joint 801 can be pre-connected to the grout supply device before drilling, avoiding repeated assembly during the use of the device, which is conducive to improving the overall operation efficiency.

[0046] During use, the device rotates and mounts two valve plates 703 in the upper position inside the cavity 701, and uses a torsion spring 704 to elastically support the valve plates 703. This allows the valve plates 703 to automatically close at the upper port of the cavity 701 without external force. This ensures that after the core 3 is pulled out from inside the grouting channel 105, the upper end of the grouting channel 105 is automatically closed, effectively guaranteeing the smooth and stable flow of grout through the grout outlet 106 into the coal mine fault. There is no need to re-seal the upper end of the grouting channel 105, which further improves the ease of use of the device and thus improves the overall efficiency of grouting construction.

[0047] The above are merely the best implementation methods adopted in this application in light of current practical needs, but the scope of protection of this application is not limited thereto.

Claims

1. A high-efficiency grouting device for fault grouting in coal mines, comprising a rod body (1), characterized in that, The lower end of the rod body (1) is connected to a rod head (101), and a drill bit (102) is fixedly installed at the lower end of the rod head (101). The upper end of the rod body (1) is connected to a rod tail (103), and a clamping end (104) is fixedly installed at the upper end of the rod tail (103). A grouting channel (105) is formed through the rod body (1), rod head (101), rod tail (103), and clamping end (104). A grout outlet hole (106) communicating with the grouting channel (105) is formed on the cylindrical surface of the rod head (101). The rod tail (103) is movably fitted with a support plate (107) and a grout stop plug (108). The grout stop plug (108) is fixedly installed on the side of the support plate (107) near the rod body (1). A nut (109) is rotatably connected on the side of the grout stop plug (108) near the clamping end (104), and the nut (109) is threaded on the outside of the rod tail (103). A core (3) is slidably inserted in the grouting channel (105), and the upper end of the core (3) protrudes out of the outside of the clamping end (104). A screw (2) is fixedly installed at the lower end of the rod body (1) and the rod tail (103), and a screw cylinder (201) is fixedly installed at the upper end of the rod body (1) and the rod head (101). The threads on the outside of the screw (2) are meshed with the threads on the inside of the screw cylinder (201). The core (3) is composed of multiple square rods (4) spliced ​​together. The outer dimensions of the square rods (4) are adapted to the inner dimensions of the grouting channel (105). The upper end of the square rods (4) is provided with a slot (401). The lower end of the square rods (4) is fixedly installed with a plug (402) adapted to the inner dimensions of the slot (401). The outer end wall of the plug (402) is provided with a hole (403), and a first ball (404) is movably installed in the hole (403). A spring (405) for elastic support of the first ball (404) is fixed in the hole (403). The inner end wall of the slot (401) is provided with a first groove (406) adapted to the first ball (404). The slot (401) has a through hole (407) on its inner end wall that extends to the outer end wall of the square rod (4), and a second ball (408) is movably installed in the through hole (407). The insert (402) has a second groove (409) on its inner end wall that is adapted to the second ball (408). The length of the grouting channel (105) opened in the rod head (101) is half the length of the grouting channel (105) opened in the rod body (1). After the column core (3) is fully inserted into the entire grouting channel (105), the connection position of the two adjacent square rods (4) is always in the middle position of each grouting channel (105), so that the splicing part of the square rod (4) in the column core (3) is misaligned with the splicing part of the rod body (1), the rod head (101) and the rod tail (103).

2. The high-efficiency grouting device for fault grouting in coal mines according to claim 1, characterized in that, There are four slurry outlet holes (106). The four slurry outlet holes (106) are symmetrically opened in pairs on the cylindrical surface of the rod head (101), and the four slurry outlet holes (106) are staggered vertically.

3. The high-efficiency grouting device for fault grouting in coal mines according to claim 1, characterized in that, A spiral blade (5) is fixedly installed on the rod head (101) and is coaxially arranged with it. The spiral blade (5) is located between the drill bit (102) and the slurry outlet (106). The spiral blade (5) protrudes out of the outside of the drill bit (102).

4. The high-efficiency grouting device for coal mine fault grouting according to claim 3, characterized in that, The outer diameter of the spiral blade (5) gradually increases from bottom to top, and the rod head (101) is provided with a storage groove (501) corresponding to the spiral blade (5).

5. The high-efficiency grouting device for fault grouting in coal mines according to claim 1, characterized in that, The rod body (1) and rod head (101) are fixedly fitted with reinforcing ribs (6), and the reinforcing ribs (6) are set as a spiral structure. The spiral extension direction of the reinforcing ribs (6) is consistent with the drilling rotation direction of the drill bit (102).

6. The high-efficiency grouting device for coal mine fault grouting according to claim 1, characterized in that, A column (7) is fixedly connected between the rod tail (103) and the clamping end (104), and a cavity (701) coaxially arranged with the grouting channel (105) is opened in the column (7). Both the upper and lower ends of the cavity (701) are connected to the grouting channel (105). A connecting hole (702) communicating with the inside of the cavity (701) is opened on the cylindrical surface of the column (7). Two symmetrically arranged valve plates (703) are rotatably installed at the upper position inside the cavity (701), and a torsion spring (704) is installed at the rotatable connection of the valve plates (703).

7. A high-efficiency grouting device for fault grouting in coal mines according to claim 6, characterized in that, The outer side of the column (7) is rotatably sleeved with an adapter box (8), and a pipe connector (801) communicating with its interior is fixedly installed on the adapter box (8).

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