A segmented combined grouting device for fractured surrounding rock in a high-stress wave chamber and its grouting support technology

Abstract

This invention discloses a segmented combined grouting device and its grouting support process for fractured surrounding rock in high-stress wave chambers, relating to the field of support technology for fractured surrounding rock chambers. The grouting device includes a support sleeve, a splicable grouting conduit, and a combined material grouting machine. The splicable grouting conduit extends into the support sleeve and is connected to the combined material grouting machine. The splicable grouting conduit includes multiple threaded, detachable hollow grouting rods. The support sleeve includes a hollow sleeve rod body with a set of grout outlet holes, the spacing between adjacent grout outlet holes being consistent with the length of a single detachable hollow grouting rod section. This invention is applicable to the support and reinforcement of damaged chambers, tunnels, coal mine roadways affected by high-stress waves, and fractured areas in deep underground engineering projects. The entire grouting support process has multiple functions, including segmented grouting, combined support of reinforcing and wave-damping zones, wave-damping buffering, and effective reinforcement of surrounding rock, and features simple operation and stable performance.

Description

Technical Field

[0001] This invention relates to the field of fractured rock chamber support technology, and in particular to a segmented combined grouting technology for fractured rock chambers in mine roadways, tunnels, chambers and other engineering fields that are affected by strong stress wave disturbances, which is suitable for wave dissipation, prevention and reinforcement. Background Technology

[0002] Currently, in deep mines where severe rockbursts frequently occur, the surrounding rock of the chambers is prone to fracturing under the influence of strong stress wave disturbances, resulting in poor overall stability of the surrounding rock and the possibility of secondary stress wave disturbances. Traditional wave mitigation methods are difficult to implement on fractured surrounding rock, and are even less effective in mitigating subsequent secondary stress wave disturbances. In particular, during the mining of deep coal mines where rockbursts are frequent, the complex stress conditions of roadways and chambers, and the coupling effect of high ground stress and frequent rockbursts exacerbate the damage to the surrounding rock. If only conventional pressure-relief anchor bolts (cables), anchor mesh, supports, lining support, and pressure relief holes are used, it is difficult to implement on fractured surrounding rock, and an effective support system cannot be formed, let alone provide strong support in the face of subsequent secondary stress wave disturbances.

[0003] Building upon this, existing technologies propose separating the reinforcement of surrounding rock from the protection against secondary stress wave disturbances. This involves first reinforcing the surrounding rock using anchor bolts (cables), anchor mesh, supports, and grouting, and then addressing potential secondary stress wave disturbances with measures such as pressure-relief anchor bolts and pressure relief holes. However, this approach often suffers from complex procedures, long construction periods, and insufficient support capacity. Furthermore, installing pressure relief holes within the reinforced fractured surrounding rock may weaken its stability; using anchor bolts with pressure relief devices to address secondary stress wave disturbances may also fail to fully utilize the pressure-relief support capacity due to the fractured nature of the surrounding rock. Additionally, separating reinforcement and protection significantly increases workload and construction time, particularly for roadways prone to rockbursts, damaged chambers, and underground chambers exposed to bunker buster attacks, where a rapid and convenient integrated reinforcement and protection method for strong wave dissipation is lacking. Summary of the Invention

[0004] To address the above problems, this invention proposes a segmented combined grouting device for fractured surrounding rock in a high-stress wave chamber and its grouting support process. It is safe and reliable, can effectively form a support structure on the fractured surrounding rock, and can also dampen and reinforce the subsequent secondary stress wave disturbance.

[0005] The technical solution of the present invention is as follows: the grouting device includes a support sleeve 1, a splicable grouting conduit 2, and a combined material grouting machine 3;

[0006] The splicable grouting conduit 2 extends into the support sleeve 1 and is connected to the combined material grouting machine 3;

[0007] The splicable grouting conduit 2 includes multiple threaded detachable hollow grouting rods 11. One end of the spliced ​​multiple detachable hollow grouting rods 11 is fixedly connected to a grouting head 13, and the other end is fixedly connected to a grouting connector 12. The grouting head 13 includes a grouting guide head 14 with a grout outlet inner hole 15. The grouting connector 12 is connected to the combined material grouting machine 3.

[0008] The support sleeve 1 includes a hollow sleeve rod body 5 with a set of grout outlet holes 4, and the hole spacing between adjacent grout outlet holes 4 is consistent with the length of a single detachable hollow grouting rod 11.

[0009] Furthermore, a tray 6 is fixedly connected to one end of the support sleeve 1, which facilitates fixing the support sleeve 1 to the surrounding rock 25.

[0010] Furthermore, a flange 9 is detachably connected to the tray 6; the outer wall of the grouting connector 12 is threadedly connected to the inner wall of the flange 9. This facilitates the positioning of the support sleeve 1 and the splicable grouting conduit 2.

[0011] Furthermore, two rubber rings 16 are fixedly fitted on the outer wall of the grouting head 13, with the two rubber rings 16 located on both sides of the grout outlet hole 15.

[0012] Furthermore, the combined material grouting machine 3 includes a grouting machine discharge pipe 17, an air pump 18, a material mixing tank 19, and a powder storage tank 20 connected in sequence.

[0013] The material mixing tank 19 is equipped with a stirrer 21 and is connected to the powder storage tank 20 through a powder control valve 22.

[0014] Follow these steps to complete the task:

[0015] Step 1: Drill a support borehole 23 in the surrounding rock 25 of the chamber with a diameter matching that of the support casing 1. Install the hollow casing rod 5 in the support borehole 23. Drill a bolt hole 24 from the opening 8 into the surrounding rock 25 with a diameter matching that of the tightening chemical bolt 7 and an effective anchoring depth. Place the chemical adhesive of the tightening chemical bolt 7 in the bolt hole 24 to anchor the tightening chemical bolt 7 in the bolt hole 24.

[0016] Step 2: Sequentially thread the grouting connector 12, the detachable hollow grouting rod 11, and the grouting head 13 to assemble them into a splicable grouting conduit 2;

[0017] Step 3: Insert the splicable grouting conduit 2 into the hollow sleeve rod body 5, then install the flange 9 on the tightening chemical bolt 7 and lock it with the tightening nut 10, and connect the grouting machine outlet pipe 17 of the combined material grouting machine 3 to the grouting connector 12.

[0018] Step 4: Close the powder control valve 22, and use the air pump 18 to press the high-strength cement slurry in the material mixing tank 19 into the splicable grouting pipe 2, and inject it into the crushed surrounding rock 25 through the slurry outlet inner hole 15 and the slurry outlet outer hole 4 to form a reinforcing zone 26.

[0019] Step 5: Sequentially disassemble the fastening nut 10 and flange 9, then remove the splicable grouting conduit 2, and remove the last section of the detachable hollow grouting rod 11; then reassemble the splicable grouting conduit 2, flange 9, and fastening nut 10, and reconnect the grouting machine outlet pipe 17 of the combined material grouting machine 3 to the grouting connector 12.

[0020] Step 6: Open the powder control valve 22, inject the perlite powder in the powder storage tank 20 into the material mixing tank 19, use the agitator 21 to fully mix the mixture, then close the powder control valve 22, use the air pump 18 to press the mixture into the splicable grouting pipe 2, and inject it into the crushed surrounding rock 25 through the grouting inner hole 15 and the grouting outer hole 4 to form a wave-damping zone 27.

[0021] Step 7: Repeat steps 5 and 6 until the grouting of the entire area where the surrounding rock 25 is located is completed, thereby alternately injecting multiple reinforcing strips 26 and wave-damping strips 27 into the fractured surrounding rock 25 to form an effective grouting support structure.

[0022] The beneficial effects of this invention are:

[0023] First, the surrounding rock at the borehole is pre-supported by the support casing, which enhances the integrity of the fractured surrounding rock to a certain extent. The hollow casing rod can effectively prevent the grouting hole from collapsing, and the tray and tightening chemical bolts can pre-reinforce the surrounding rock on the surface of the chamber, providing a safe operating environment for grouting work.

[0024] Second, the segmented combined grouting support not only reinforces the fractured surrounding rock, but also creates multiple wave-damping zones within the surrounding rock due to different grouting and solidification times. This weakens the impact of strong stress wave disturbances on the chamber, enhances the reinforcement effect, and integrates reinforcement and protection into one, simplifying procedures and shortening the construction period.

[0025] 3. The grouting conduit can be aligned with the grouting inner hole and the grouting outer hole of different sections by adding or removing detachable hollow grouting rods, so as to realize segmented grouting.

[0026] Fourth, the flange and fastening nut at the end of the support casing can be quickly and easily disassembled, which facilitates the adjustment of the grouting section by the grouting pipe. At the same time, the flange and the grouting connector are in close contact, which can effectively prevent the grout in the contact gap between the support casing and the splicable grouting pipe from overflowing from the support borehole.

[0027] Fifth, this invention can form multiple wave-absorbing zones within the surrounding rock of the chamber. During the transmission of strong stress waves to the chamber, this grouting support technology can weaken the stress waves, absorb the energy of the stress waves, and reduce the impact of strong stress waves on the chamber. At the same time, the support technology of alternating wave-absorbing zones and reinforcement zones will not weaken the support effect of grouting reinforcement, thus achieving reinforcement while enhancing wave absorption.

[0028] VI. The method for controlling the grouting section in this invention has a series of advantages, such as simple operation, control of grouting position by adding or removing detachable hollow grouting rods, convenient assembly, simple structure, low precision requirements for equipment, and no need for operators to calculate the retraction distance required for segmented grouting of the grouting rods.

[0029] Overall, this invention is applicable to the support and reinforcement of damaged chambers, tunnels, coal mine roadways affected by strong stress waves, and fractured areas of deep underground engineering projects. The entire grouting support process has multiple functions, including segmented grouting, combined support of reinforcing and wave-damping zones, wave-damping buffering, and effective reinforcement of surrounding rock, and is characterized by simple operation and stable performance. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the segmented combined grouting device for fractured surrounding rock in a high-stress wave chamber according to the present invention;

[0031] Figure 2 This is a detailed drawing of the support sleeve structure of the present invention, wherein... Figure 2 A is a cross-sectional view of the support sleeve. Figure 2 b is a side view of the support sleeve;

[0032] Figure 3 This is a detailed structural diagram of the splicable grouting conduit of the present invention;

[0033] Figure 4 This is a detailed structural diagram of the grouting head of the present invention;

[0034] Figure 5 This is a detailed structural drawing of the combined material grouting machine of the present invention, wherein... Figure 5 A is a cross-sectional view of the combined material grouting machine. Figure 5 b is a diagram of the internal structure of the material mixing tank and the powder storage tank;

[0035] Figure 6 This is a schematic diagram of the installation of the support sleeve according to the present invention;

[0036] Figure 7 This is a schematic diagram of the installation of the splicable grouting conduit of the present invention;

[0037] Figure 8 This is a schematic diagram of the grouting reinforcement zone of the segmented combined grouting device of the present invention.

[0038] Figure 9This is a schematic diagram of the rock grouting wave-damping zone of the segmented combined grouting device of the present invention;

[0039] Figure 10 This is a schematic diagram of the segmented combined grouting support process for fractured surrounding rock in a high-stress wave chamber according to the present invention.

[0040] In the diagram: 1—Support sleeve, 2—Assembleable grouting conduit, 3—Combined material grouting machine, 4—Outer grout outlet, 5—Hollow sleeve rod body, 6—Plate, 7—Tightening chemical bolt, 8—Opening, 9—Flange, 10—Tightening nut, 11—Removable hollow grouting rod, 12—Grouting connector, 13—Grouting head, 14—Grouting guide head, 15—Inner grout outlet, 16—Rubber ring, 17—Grouting machine discharge pipe, 18—Air pump, 19—Material mixing tank, 20—Powder storage tank, 21—Agitator, 22—Powder control valve, 23—Support borehole, 24—Bolt hole, 25—Broken surrounding rock, 26—Reinforcing strip, 27—Wave damping strip. Detailed Implementation

[0041] To clearly illustrate the technical features of this patent, the following detailed description is provided through specific embodiments and in conjunction with the accompanying drawings.

[0042] As attached Figure 1 As shown, the segmented combined grouting device for fractured surrounding rock in the high-stress wave chamber includes a support sleeve 1, a splicable grouting pipe 2, and a combined material grouting machine 3.

[0043] As attached Figure 2 As shown, the support sleeve 1 includes a hollow sleeve rod body 5 with a set of grout outlet holes 4. The hole spacing between adjacent grout outlet holes 4 is consistent with the length of the detachable hollow grouting rod 11. An integrally connected tray 6 is provided at the end of the hollow sleeve rod body 5. An opening 8 is provided on the tray 6, and it is connected to the flange 9 by tightening chemical bolts 7 and fastening nuts 10.

[0044] As attached Figure 3 As shown, the splicable grouting conduit 2 includes multiple sections of threaded detachable hollow grouting rod 11. A grouting head 13 is fixedly connected to one end of the detachable hollow grouting rod 11, and a grouting connector 12 is fixedly connected to the other end. One end of the detachable hollow grouting rod 11 is internally threaded, and the other end is externally threaded. The splicable grouting conduit 2 can move within the hollow sleeve rod body 5.

[0045] As attached Figure 4 As shown, the grouting head 13 includes a grouting guide head 14 with a grout outlet inner hole 15, and a rubber ring 16 is fitted on the grouting guide head 14. The rubber ring 16 is installed on both sides of the grout outlet inner hole 15 and is fixed with neoprene rubber glue.

[0046] The grouting connector 12 is connected to the combined material grouting machine 3 via a thread;

[0047] As attached Figure 5 As shown, the combined material grouting machine 3 includes a grouting machine discharge pipe 17, an air pump 18, a material mixing tank 19, and a powder storage tank 20;

[0048] The material mixing tank 19 is equipped with a stirrer 21 and is connected to the powder storage tank 20 through a powder control valve 22;

[0049] The splicable grouting conduit 2 can move within the support sleeve 1, and the grout outlet inner hole 15 of the splicable grouting conduit 2 is aligned with the grout outlet outer hole 4 by adding or removing detachable hollow grouting rods 11, thereby achieving segmented grouting.

[0050] Specifically, such as Figure 2 , 3 As shown in 8 and 9, Figure 2 The spacing of the grout outlet holes 4 on the support sleeve 1 is set according to the support scheme. Grouting is carried out in sections from far to near. During the first grouting, the grouting connector 12, the detachable hollow grouting rod 11, and the grouting head 13 are sequentially threaded together to form a splicable grouting conduit 2. Rubber rings 16 are installed on both sides of the grout outlet inner hole 15 and fixed with neoprene rubber glue (as shown in the attached document). Figure 3 Insert the splicable grouting conduit 2 into the hollow sleeve rod body 5 (allowing for a certain gap), install the flange 9, tighten the fastening nut 10, and connect the combined material grouting machine 3 for grouting. When material is injected, the material squeezes the rubber rings 16 on both sides, causing radial deformation and reducing the gap inside the pipe, restricting the grout flow to other grout outlet holes 4, thus achieving section grouting (as shown in the attached diagram). Figure 8 Flange 9 and grouting connector 12 restrict the movement of the splicable grouting conduit 2 and prevent grout overflow at the end; then remove the fastening nut 10 and flange 9, retract the splicable grouting conduit 2, unscrew the end section of the detachable hollow grouting rod 11, reconnect it to the grouting connector 12 by thread, then install flange 9 and fastening nut 10 in sequence, thread the grouting machine outlet pipe 17 to the grouting connector 12, open the powder control valve 22, and use cement grout containing perlite powder for grouting the next section (as shown in the attached document). Figure 9 ); Adding or removing hollow sleeve rods 5 and opening / closing powder control valves 22 to achieve segmented combined grouting.

[0051] This invention provides a segmented combined grouting support technology for fractured surrounding rock in a high-stress wave chamber:

[0052] As attached Figure 6As shown, a drilling rig is used to drill a support borehole 23 in the surrounding rock 25 of the chamber, with a diameter matching that of the support casing 1. The hollow casing rod 5 is installed in the support borehole 23. The drilling rig is used to drill a bolt hole 24 from the opening 8 into the surrounding rock 25, matching the diameter and effective anchoring depth of the tightening chemical bolt 7. Chemical adhesive for the tightening chemical bolt 7 is placed in the bolt hole 24 to anchor the tightening chemical bolt 7 in the bolt hole 24. The splicable grouting conduit 2 is inserted into the hollow casing rod 5, and then the flange 9 and fastening nut 10 are installed in sequence. The grouting machine outlet pipe 17 of the combined material grouting machine 25 is threadedly connected to the grouting connector 12. The powder control valve 22 is closed, and the high-strength cement slurry in the material mixing tank 19 is pumped into the splicable grouting conduit 2 by the air pump 18. The slurry is ejected through the slurry outlet inner hole 15 and the slurry outlet outer hole 4 and injected into the broken surrounding rock 25 to form a reinforcing zone 26.

[0053] As attached Figure 9 As shown, disassemble the fastening nut 10 and flange 9 in sequence, then remove the splicable grouting pipe 2, unscrew the last section of the detachable hollow grouting rod 11, and reconnect it to the grouting connector 12 by thread. Then install flange 9 and fastening nut 10 in sequence, and thread the grouting machine outlet pipe 17 to the grouting connector 12. Open the powder control valve 22, inject the perlite powder in the powder storage tank 20 into the material mixing tank 19, use the agitator 21 to fully mix the mixture, and use the air pump 18 to press the mixture into the splicable grouting pipe 2, which is then ejected through the grout outlet inner hole 15 and the grout outlet outer hole 4, and injected into the broken surrounding rock 25 to form a wave-damping zone 27.

[0054] In the above:

[0055] The grout outlet inner hole 15 of the splicable grouting conduit 2 is kept aligned with the grout outlet outer hole 4 by adding or removing detachable hollow grouting rods 11. The powder control valve 22 is opened and closed to control the type of grouting material, so as to realize segmented material mixing grouting.

[0056] The support casing 1 provides pre-support for the surrounding rock at borehole 23, which to a certain extent enhances the integrity of the fractured surrounding rock 25. The hollow casing rod 5 can effectively prevent the grouting hole from collapsing. The tray 6 and the tightening chemical bolts 7 can pre-reinforce the surrounding rock on the surface of the chamber, providing a safe operating environment for grouting work.

[0057] The grouting pressure is used to squeeze the rubber ring 16 to cause longitudinal deformation, which restricts the material from flowing from the inner grout outlet 15 to the outer grout outlet 4 in the non-grouting section inside the pipe wall. This, together with the flange 9 and the grouting connector 12, restricts the overflow of grout from the end of the splicable grouting conduit 2; together, the purpose of segmented grouting without overflow is achieved.

[0058] Segmented mixed grouting is performed within the fractured surrounding rock 25, with alternating reinforcement zones 26 and wave-dissipating zones 27. Reinforcement zones 26 are fixedly installed at the near and far ends, forming multiple reinforcement zones 26 and wave-dissipating zones 27 within the fractured surrounding rock of the chamber. When a strong stress wave propagates from the far end into the chamber, the reinforcement zone 26 at the far end ruptures. The stress wave passes through the wave-dissipating zone 27, which is composed of high-strength cement and perlite powder. Part of the stress wave energy is absorbed by the wave-dissipating zone 27, and the transmitted stress wave is continuously weakened by the alternating reinforcement zones 26 and wave-dissipating zones 27.

[0059] In summary, by utilizing the support capacity of the support casing 1 itself and the segmented combined grouting support to form multiple alternating reinforcement zones 26 and wave-damping zones 27 within the fractured surrounding rock of the chamber, the present invention can strengthen the surrounding rock and absorb and weaken secondary strong stress waves in the fractured surrounding rock of the chamber where rockbursts frequently occur. In the reinforcement of damaged chambers, coal mine roadways prone to rock bursts, and other deep underground engineering projects using this invention as the support material and support technology, this support technology first reinforces the fractured surrounding rock of the damaged chamber. Secondly, when potential secondary strong stress wave disturbances are transmitted to the chamber, the strong stress waves are absorbed and weakened by the multi-channel wave-damping belt 27 composed of high-strength porous perlite powder cement. Together with the reinforcing belt, it plays the role of supporting the surrounding rock and protecting the chamber. At the same time, the support casing 1 itself has a certain supporting effect, strengthening the integrity of the fractured surrounding rock, thus achieving the reinforcement of the fractured surrounding rock of the chamber. The segmented combined grouting support constitutes a stable support system for the fractured surrounding rock of the strong stress wave chamber, which is more conducive to repair and enhances the safety of the chamber affected by strong stress wave disturbances.

[0060] There are many specific ways to implement this invention. The above description is only a preferred embodiment of this invention. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of this invention, and these improvements should also be considered within the scope of protection of this invention.

Claims

1. A segmented combined grouting support technology for fractured surrounding rock in a high-stress wave chamber, characterized in that, Based on the grouting device, the grouting device includes a support sleeve (1), a splicable grouting pipe (2), and a combined material grouting machine (3). The splicable grouting conduit (2) extends into the support sleeve (1) and is connected to the composite material grouting machine (3). The splicable grouting conduit (2) includes multiple threaded detachable hollow grouting rods (11). One end of the spliced ​​multiple detachable hollow grouting rods (11) is fixedly connected to a grouting head (13), and the other end is fixedly connected to a grouting connector (12). The grouting head (13) includes a grouting guide head (14) with a grout outlet hole (15). The grouting connector (12) is connected to the combined material grouting machine (3). The support sleeve (1) includes a hollow sleeve rod body (5) with a set of grout outlet holes (4), and the hole spacing between adjacent grout outlet holes (4) is consistent with the length of a single detachable hollow grouting rod (11). Two rubber rings (16) are also fixedly fitted on the outer wall of the grouting head (13), and the two rubber rings (16) are located on both sides of the grout outlet hole (15); The combined material grouting machine (3) includes a grouting machine discharge pipe (17), an air pump (18), a material mixing tank (19), and a powder storage tank (20) connected in sequence. The material mixing tank (19) is equipped with a stirrer (21) and is connected to the powder storage tank (20) through a powder control valve (22); Follow these steps to complete the task: Step 1: Drill a support borehole (23) in the surrounding rock (25) of the chamber with a diameter matching that of the support casing (1), and install the hollow casing rod (5) in the support borehole (23); Step 2: Connect the grouting connector (12), the detachable hollow grouting rod (11), and the grouting head (13) in sequence by threading them together to form a splicable grouting conduit (2). Step 3: Insert the splicable grouting conduit (2) into the hollow sleeve rod body (5), and connect the grouting machine outlet pipe (17) of the combined material grouting machine (3) to the grouting connector (12); Step 4: Close the powder control valve (22), use the air pump (18) to press the high-strength cement slurry in the material mixing tank (19) into the splicable grouting pipe (2), and inject it into the crushed surrounding rock (25) through the slurry outlet inner hole (15) and the opposite slurry outlet outer hole (4) to form a reinforcing zone (26). Step 5: Remove the last section of the detachable hollow grouting rod (11) and reconnect the grouting machine outlet pipe (17) of the combined material grouting machine (3) to the grouting connector (12); Step 6: Open the powder control valve (22), inject the perlite powder in the powder storage tank (20) into the material mixing tank (19), use the agitator (21) to fully mix the mixture, then close the powder control valve (22), use the air pump (18) to press the mixture into the splicable grouting pipe (2), and inject it into the crushed surrounding rock (25) through the grouting inner hole (15) and grouting outer hole (4) to form a wave-damping zone (27). Step 7: Repeat steps 5 and 6 until the grouting of the entire area of ​​the surrounding rock (25) is completed, thereby alternately injecting multiple reinforcing strips (26) and wave-damping strips (27) into the fractured surrounding rock (25) to form an effective grouting support structure.

2. The segmented combined grouting support technology for fractured surrounding rock in a high-stress wave chamber according to claim 1, characterized in that, One end of the support sleeve (1) is fixedly connected to a tray (6).

3. The segmented combined grouting support technology for fractured surrounding rock in a high-stress wave chamber according to claim 2, characterized in that, The tray (6) is provided with an opening, and a flange (9) is detachably connected through the opening; the outer wall of the grouting connector (12) is threadedly connected to the inner wall of the flange (9).

4. The segmented combined grouting support technology for fractured surrounding rock in a high-stress wave chamber according to claim 1, characterized in that, In step 1, a drilling rig is used to drill a bolt hole (24) from the opening (8) into the surrounding rock (25) that matches the diameter and effective anchoring depth of the tightening chemical bolt (7), and a chemical adhesive for the tightening chemical bolt (7) is placed in the bolt hole (24) to anchor the tightening chemical bolt (7) in the bolt hole (24).

5. The segmented combined grouting support technology for fractured surrounding rock in a high-stress wave chamber according to claim 1, characterized in that, Step 3: After inserting the splicable grouting conduit (2) into the hollow sleeve rod body (5), install the flange (9) on the tightening chemical bolt (7) and lock it with the tightening nut (10).

6. The segmented combined grouting support technology for fractured surrounding rock in a high-stress wave chamber according to claim 1, characterized in that, Step 5: Remove the fastening nut (10) and flange (9) in sequence, then remove the splicable grouting pipe (2), remove the end section of the detachable hollow grouting rod (11), and then reinstall the splicable grouting pipe (2), flange (9), and fastening nut (10). Finally, connect the grouting machine discharge pipe (17) to the grouting connector (12).

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