Drilling and grouting integrated rod for surrounding rock of soft roadway

Abstract

The utility model discloses a soft roadway surrounding rock drilling and grouting integrated rod which comprises a drill rod, a grouting rod, a drill rod nipple and a grouting rod nipple. The drill rod double nipple and the grouting rod double nipple are matched, so that the grouting rod can move in the drill rod, when the drill rod is in a drilling state, the position of a grouting opening of the grouting rod is different from that of a grouting hole of the drill rod, the grouting hole is blocked by the blocking structure, and therefore water injected into the grouting rod can directly reach a drill bit in the drilling process; in the grouting state, the grouting rod is moved relative to the drill rods, the positions of the grouting openings and the positions of the grouting holes are the same, the plugging structures are moved away, at the moment, the grouting openings communicate with the grouting holes, then grouting is conducted through the grouting rod, grout is discharged to gaps between the peripheries of the drill rods and the drill holes through the grouting holes and the grouting openings, and supporting and reinforcing work on the drill holes is achieved; according to the in-situ grouting device, on the premise of guaranteeing smooth water injection during drilling, after the grouting depth is reached, in-situ grouting can be achieved without retreating and replacing a drill rod, and therefore the grouting effect of a drilled hole is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of underground drilling, specifically a drilling and grouting integrated rod for weak tunnel surrounding rock. Background Technology

[0002] Drilling is one of the main technologies for exploring geological conditions in the current mining engineering field. Due to the large depth of the drill hole, it often penetrates aquifers and weak rock strata. Among them, weak rock strata are characterized by low strength, susceptibility to disturbance and damage, and weakening upon contact with water. Therefore, under the combined effects of drilling disturbance and water seepage, the mechanical properties of weak rock strata deteriorate severely, which is detrimental to the stability of the surrounding rock in the tunnel. Grouting of weak surrounding rock can help improve the strength of weak rock. However, currently, drilling and grouting processes are usually separated. That is, drilling is carried out first using a drilling rig and drill rod. After reaching the designated depth, the drill rod is withdrawn and then a grouting steel pipe is inserted for grouting. This is because during the drilling process, the drill rod internally injects water near the drill bit to expel coal and rock debris. Grouting, on the other hand, requires grouting reinforcement at different locations around the drill rod and the borehole. Therefore, the water injection channels inside the existing hollow drill rod cannot be used for grouting. However, after drilling is completed and the drill rod is withdrawn, the borehole is prone to closure due to the stress of the surrounding rock and the characteristics of the rock. This prevents the subsequent grouting pipe from being fully inserted into the borehole, thus failing to achieve the required grouting effect.

[0003] In view of the above situation, how to provide an integrated drilling and grouting rod that can perform in-situ grouting without replacing the drill rod after drilling to the grouting depth, thereby ensuring the grouting effect of the borehole, is the research direction required by this utility model. Summary of the Invention

[0004] To address the problems existing in the prior art, this utility model provides an integrated drilling and grouting rod for soft roadway surrounding rock, which enables in-situ grouting without replacing the drill rod after drilling to the grouting depth, thereby ensuring the grouting effect of the borehole.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: an integrated drilling and grouting rod for soft roadway surrounding rock, comprising a drill rod, a grouting rod, drill rod wires, and grouting rod wires;

[0006] There are multiple drill rods, and two adjacent drill rods are coaxially connected by drill rod thread; each drill rod has a grouting hole on its side wall.

[0007] The grouting rod is located inside the drill rod and corresponds one-to-one with the drill rod wire. It includes two wire-pairing structures, each consisting of a hollow connecting rod and a hollow limiting end. The hollow connecting rod and the hollow limiting end are coaxially connected, and the outer diameter of the hollow connecting rod is smaller than the inner diameter of the drill rod wire, while the outer diameter of the hollow limiting end is larger than the inner diameter of the drill rod wire. The hollow connecting rods of the two wire-pairing structures extend into the drill rod wire and are coaxially connected. The sum of the lengths of the two hollow connecting rods is greater than the drill rod wire, allowing the grouting rod wire to move relative to the drill rod wire along the drill rod axis.

[0008] The grouting rods are multiple and all located inside the drill rod. Each grouting rod has a grouting port and a sealing structure on its side wall. Both ends of the grouting rod are coaxially connected to the threaded connection structure of the nearest grouting rod. When the drill rod is in the drilling state, the grouting port and the grouting hole are in different positions and the sealing structure seals the grouting hole. When the drill rod is in the grouting state, the grouting rod is moved so that the grouting port and the grouting hole are in the same position and the sealing structure is removed. At this time, the grouting port and the grouting hole are connected.

[0009] Furthermore, it also includes a grouting rod return spring. Each grouting rod has a return spring fitted onto the hollow connecting rod of the grouting rod pair, which is used to reset the grouting rod after grouting. When the drill rod is in the drilling state, the grouting rod return spring is in the initial state; when the drill rod is in the grouting state, the grouting rod return spring is compressed and deformed, and drives the grouting rod to reset after grouting is completed.

[0010] Furthermore, the diameter of the grouting hole gradually increases from the outer wall of the drill rod to the inner wall. This facilitates the sealing of the hole with a plug and also allows the plug to be moved away from the inside when the grouting rod is moved.

[0011] Furthermore, the sealing structure includes a plug and a pressure spring, with both ends of the pressure spring connected to the plug and the outer wall of the grouting rod, respectively. When the drill rod is in the drilling state, the plug is inside the grouting hole to seal it. This structure facilitates the sealing and opening of the grouting hole.

[0012] Furthermore, it also includes a grouting head, which comprises a shell, a grouting pipeline, a boss, a grouting head fixing screw plate, and a locking nut. A boss lifting groove is provided on the side wall of the shell, through which the grouting pipeline passes. Its end is provided with a grouting rod connecting thread for connecting to one end of the grouting rod. The boss is fixed to the grouting pipeline and located within the boss lifting groove. When the boss moves within the boss lifting groove, it can drive the grouting rod to move within the drill rod. Multiple grouting head fixing screw plates are arranged in a circle at one end of the shell, and the radius of the screws on each grouting head fixing screw plate gradually decreases from the end furthest from the shell to the end closest to the shell. Locking nuts are installed outside the multiple grouting head fixing screw plates. One end of the drill rod is inserted into the multiple grouting head fixing screw plates, and the locking nuts are rotated away from the shell, so that each grouting head fixing screw plate is pressed and fixed to the drill rod. During grouting, one end of the grouting rod located outside the borehole can be moved outward and held in place. Grout can then be injected into the grouting rod through this end. However, this method cannot accurately determine the positional relationship between the grouting port and the grouting hole after the movement. Adding a grouting head, on the other hand, allows the grouting port and the grouting hole to be moved from one side to the other through a boss within a boss lifting groove, thus ensuring that they are in the same position and connected. This facilitates subsequent grouting work.

[0013] Compared with existing technologies, this utility model adopts a combination of drill rod, grouting rod, drill rod threading, and grouting rod threading. Through the cooperation of the drill rod threading and grouting rod threading, the grouting rod can move axially within the drill rod. When the drill rod is in the drilling state, the grouting port of the grouting rod is located differently from the grouting hole of the drill rod, and the sealing structure on the outside of the grouting rod seals the grouting hole. Therefore, during drilling, water injected into the grouting rod can directly reach the drill bit, and water will not be discharged from the various grouting holes into the borehole. When the drill rod is in the grouting state... During the process, the grouting rod is moved relative to the drill rod so that the grouting port and the grouting hole are in the same position and the sealing structure is removed. At this time, the grouting port and the grouting hole are connected. Then, grout is injected through the grouting rod. The grout is discharged through each grouting hole and grouting port into the gap between each drill rod and the drill hole. After the grout solidifies, the support and reinforcement work of this part of the drill hole is achieved. This utility model can ensure the smooth water injection during drilling. When the grouting depth is reached, grouting can be carried out in situ without replacing the drill rod, thereby ensuring the grouting effect of the drill hole. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of the present invention in the drilling state;

[0015] Figure 2 This is a schematic diagram of the structure of this utility model in the grouting state;

[0016] Figure 3 This is a schematic diagram of the drill rod wire in this utility model;

[0017] Figure 4This is a schematic diagram of the grouting rod and wire structure in this utility model;

[0018] Figure 5 yes Figure 4 A diagram illustrating the breakdown;

[0019] Figure 6 This is a schematic diagram of the grouting head in this utility model.

[0020] In the diagram: 1-Drill rod; 101-Grouting hole; 2-Drill rod threaded connection; 3-Grouting rod return spring; 4-Grouting rod threaded connection; 5-Grouting rod; 501-Plug; 502-Pressure spring; 503-Grouting port; 6-Grouting head; 601-Grouting rod connecting thread; 602-Grouting pipeline; 603-Grouting head fixing thread plate; 604-Locking nut; 605-Boss lifting groove; 606-Boss. Detailed Implementation

[0021] The present invention will be further described below.

[0022] like Figure 1 and 2 As shown, this utility model includes a drill rod 1, a grouting rod 5, a drill rod threaded connector 2, and a grouting rod threaded connector 4;

[0023] There are multiple drill rods 1, and two adjacent drill rods 1 are coaxially connected by drill rod coupler 2; each drill rod 1 has a grouting hole 101 on its side wall;

[0024] like Figures 3 to 5 As shown, the grouting rod wire pair 4 is located inside the drill rod 1 and corresponds one-to-one with the drill rod wire pair 2. It includes two wire pair structures, each consisting of a hollow connecting rod and a hollow limiting end. The hollow connecting rod and the hollow limiting end are coaxially connected, and the outer diameter of the hollow connecting rod is smaller than the inner diameter of the drill rod wire pair 2, while the outer diameter of the hollow limiting end is larger than the inner diameter of the drill rod wire pair 2. The hollow connecting rods of the two wire pair structures extend into the drill rod wire pair 2 and are coaxially connected. The sum of the lengths of the two hollow connecting rods is greater than that of the drill rod wire pair 2, allowing the grouting rod wire pair 4 to move relative to the drill rod wire pair 2 along the axial direction of the drill rod 1.

[0025] The grouting rods 5 are multiple and all located inside the drill rod 1. Each grouting rod 5 has a grouting port 503 and a sealing structure on its side wall. Both ends of the grouting rod 5 are coaxially connected to the threaded structure of the nearest grouting rod threaded pair 4. When the drill rod 1 is in the drilling state, the grouting port 503 is not in the same position as the grouting hole 101 and the sealing structure seals the grouting hole 101. When the drill rod 1 is in the grouting state, the grouting rod 5 is moved so that the grouting port 503 is in the same position as the grouting hole 101 and the sealing structure is removed. At this time, the grouting port 503 is connected to the grouting hole 101. The grouting rod 5 also includes a grouting rod return spring 3. Each grouting rod threaded pair 4 has a grouting rod return spring 3 sleeved on its hollow connecting rod to reset the grouting rod 5 after grouting. When drill rod 1 is in the drilling state, the grouting rod return spring 3 is in its initial state; when drill rod 1 is in the grouting state, the grouting rod return spring 3 is compressed and deformed, and after grouting is completed, it drives the grouting rod 5 to return to its original position. The diameter of the grouting hole 101 gradually increases from the outer wall of the drill rod to the inner wall of the drill rod. This facilitates the sealing of the plug 501 and also facilitates the removal of the plug 501 from its interior when the grouting rod 5 moves.

[0026] As an improvement of this utility model, the sealing structure includes a plug 501 and a pressure spring 502. The side wall of the grouting rod 5 has a groove, and both ends of the pressure spring 502 are connected to the plug 501 and the groove on the outer wall of the grouting rod 5, respectively. When the drill rod 1 is in the drilling state, the plug 501 is inside the grouting hole 101, sealing it. When the drill rod 1 is in the grouting state, the grouting rod 5 is moved so that the grouting port 503 is in the same position as the grouting hole 101, and the sealing structure is compressed into the groove and moved away. At this time, the grouting port 503 is connected to the grouting hole 101. This structure facilitates the sealing and opening of the grouting hole 101.

[0027] As another improvement of this utility model, it also includes a grouting head 6, such as... Figure 6As shown, it includes a housing, a grouting pipe 602, a boss 606, a grouting head fixing screw plate 603, and a locking nut 604; a boss lifting groove 605 is opened on the side wall of the housing, the grouting pipe 602 passes through the housing, and its end is provided with a grouting rod connecting thread 601 for connecting to one end of the grouting rod 5; the boss 606 is fixed on the grouting pipe 602 and is located in the boss lifting groove 605. When the boss 606 moves in the boss lifting groove 605, it can drive the grouting rod 5 inside the drill rod 1. The grouting head fixing screw plate 603 is multiple, and the multiple grouting head fixing screw plates 603 are arranged in a circle at one end of the outer shell. The wire radius on each grouting head fixing screw plate 603 gradually decreases from the end away from the outer shell to the end closer to the outer shell. The locking nut 604 is installed on the outside of the multiple grouting head fixing screw plates. One end of the drill rod is inserted into the multiple grouting head fixing screw plates 604, and the locking nut is rotated away from the outer shell, so that each grouting head fixing screw plate 603 is pressed and fixed to the drill rod 1. During grouting, one end of the grouting rod 5 located at the outer end of the borehole can be moved outward and held. Grout can then be injected into the grouting rod 5 through this end. However, this method cannot accurately determine the positional relationship between the grouting port 503 and the grouting hole 101 after the movement. By adding a grouting head 6, the grouting port 503 and the grouting hole 101 can be moved from one side to the other through the boss 606 within the boss lifting groove 605, thus ensuring that they are in the same position and connected. This facilitates subsequent grouting work.

[0028] During operation, after assembling the utility model, one end is mounted on the drilling rig, and the other end is fitted with a hollow drill bit to begin drilling. At this time, one end of the grouting rod 5, located near the drilling rig, is connected to the water pump. This is used to deliver high-pressure water to the hollow drill bit during drilling. Because the grouting port 503 and the grouting hole 101 are located at different positions during drilling, and the sealing structure blocks the grouting hole 101, clean water will not be discharged from the grouting holes 101 into the borehole, ensuring that the high-pressure water is directly delivered to the hollow drill bit. This ensures smooth drilling. After drilling is completed, the water pump and the grouting rod 5, located outside the borehole, are connected. One end of rod 5 is disconnected and the grouting head 6 is connected to it. At this time, the grouting rod 5 and the grouting rod thread 4 are moved as a whole inside the drill rod 1 by moving the boss 606, so that the grouting port 503 is in the same position as the grouting hole 606 and the sealing structure is removed. At this time, the grouting port 503 is connected to the grouting hole 606. By injecting grout into the grouting rod 5, the grout is discharged through each grouting hole 101 and the grouting port 503 to the gap between each drill rod and the drill hole. After the grout solidifies, the support and reinforcement work of this part of the drill hole is achieved. At this time, the boss 606 is reset and the grouting head 6 is disassembled, and the next stage of drilling construction can be carried out.

[0029] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A drilling and grouting integrated rod for weak roadway surrounding rock, characterized in that, This includes drill pipe, grouting pipe, drill pipe threaded connection, and grouting pipe threaded connection; There are multiple drill rods, and two adjacent drill rods are coaxially connected by drill rod thread; each drill rod has a grouting hole on its side wall. The grouting rod is located inside the drill rod and corresponds one-to-one with the drill rod wire. It includes two wire-pairing structures, each consisting of a hollow connecting rod and a hollow limiting end. The hollow connecting rod and the hollow limiting end are coaxially connected, and the outer diameter of the hollow connecting rod is smaller than the inner diameter of the drill rod wire, while the outer diameter of the hollow limiting end is larger than the inner diameter of the drill rod wire. The hollow connecting rods of the two wire-pairing structures extend into the drill rod wire and are coaxially connected. The sum of the lengths of the two hollow connecting rods is greater than the drill rod wire, allowing the grouting rod wire to move relative to the drill rod wire along the drill rod axis. The grouting rods are multiple and all located inside the drill rod. Each grouting rod has a grouting port and a sealing structure on its side wall. Both ends of the grouting rod are coaxially connected to the threaded connection structure of the nearest grouting rod. When the drill rod is in the drilling state, the grouting port and the grouting hole are in different positions and the sealing structure seals the grouting hole. When the drill rod is in the grouting state, the grouting rod is moved so that the grouting port and the grouting hole are in the same position and the sealing structure is removed. At this time, the grouting port and the grouting hole are connected.

2. The integrated drilling and grouting rod for weak roadway surrounding rock according to claim 1, characterized in that, It also includes a grouting rod return spring. Each grouting rod has a grouting rod return spring fitted on the hollow connecting rod of the grouting rod pair, which is used to reset the grouting rod after grouting.

3. The integrated drilling and grouting rod for weak roadway surrounding rock according to claim 1, characterized in that, The diameter of the grouting hole gradually increases from the outer wall of the drill rod to the inner wall of the drill rod.

4. The integrated drilling and grouting rod for weak roadway surrounding rock according to claim 1, characterized in that, The sealing structure includes a plug and a pressure spring, with both ends of the pressure spring connected to the plug and the outer wall of the grouting rod, respectively; when the drill rod is in the drilling state, the plug is inside the grouting hole to seal it.

5. The integrated drilling and grouting rod for weak roadway surrounding rock according to claim 1, characterized in that, It also includes a grouting head, which comprises a shell, a grouting pipeline, a boss, a grouting head fixing screw plate, and a locking nut. A boss lifting groove is provided on the side wall of the shell. The grouting pipeline passes through the shell and has a grouting rod connecting thread at its end for connecting to one end of the grouting rod. The boss is fixed to the grouting pipeline and located within the boss lifting groove. When the boss moves within the boss lifting groove, it can drive the grouting rod to move within the drill rod. Multiple grouting head fixing screw plates are arranged in a circle at one end of the shell, and the radius of the screws on each fixing screw plate gradually decreases from the end furthest from the shell to the end closest to the shell. Locking nuts are installed outside the multiple grouting head fixing screw plates. One end of the drill rod is inserted into the multiple grouting head fixing screw plates, and the locking nuts are rotated away from the shell to press and fix each grouting head fixing screw plate to the drill rod.

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