A segmented advancement drill rod rapid grouting device, system and grouting method

Abstract

The present invention discloses a segmented forward drill pipe rapid grouting device, comprising: a plurality of double-tube drill pipes, each of which is a concentric double-tube structure, with an annular channel formed between the outer tube and the inner tube, and the inner tube being a hollow structure; each double-tube drill pipe is used to be axially arranged in a grouting hole in sequence in sections, and can be detachably connected and communicated in sequence front and back. A drill bit is provided with a single through hole in the axial direction, which is connected and communicated with the end of a double-tube drill pipe at the front end. A plurality of hydraulic bladder infusion tubes, each of which is a tube body with open ends, is parallel to and tightly fits the double-tube drill pipe. A grout-stopping hydraulic bladder is a hollow elastic sac-shaped body, which is coated around the outer wall of the front section of the double-tube drill pipe at the front end, and is communicated with the hydraulic bladder infusion tube at the front end. When grouting with the grouting device, the fixed-point grouting can be quickly sealed at any time without withdrawing the drill pipe, and then the seal can be cancelled to continue drilling forward, thereby realizing segmented forward grouting.

Description

[Technical field]

[0001] The invention belongs to the technical field of civil engineering tunnel construction, and in particular relates to a segmented advancing drill rod rapid grouting device, system and grouting method. [Background technology]

[0002] During the construction of tunnels and underground projects, soft and water-rich strata are often encountered, which are prone to water and mud bursts and large deformations on the excavation surface, endangering the safety of tunnel construction. At present, the grouting method is often used to improve the properties of the surrounding rock, that is, to inject cementitious materials into the surrounding rock under a certain pressure and consolidate them, filling the pores and compacting the soil, which has a good reinforcement and water blocking effect.

[0003] At present, there are two main horizontal grouting methods: segmented forward grouting and segmented backward grouting. Segmented forward grouting is suitable for poor formation conditions, when a large amount of water and sand gushing is encountered during the drilling process, or when the hole collapses severely and it is impossible to continue drilling, that is, the drill rod is withdrawn for grouting, and after improving the surrounding rock of that section, the hole is re-drilled, and the hole is deepened section by section until the designed drilling depth is reached. The drill rod is withdrawn and grouting is performed for the last time to complete the designed grouting task of the hole. This method has a better grouting effect, but the workload of repeated drilling is large, the overall grouting volume is large, the grouting material loss is large, and the construction period is long. [Summary of the invention]

[0004] The purpose of the present invention is to provide a segmented forward drill rod rapid grouting device, system and grouting method. During grouting, the fixed-point grouting can be quickly sealed at any time without withdrawing the drill rod, and then the seal can be cancelled to continue drilling forward, thereby realizing segmented forward grouting.

[0005] The present invention adopts the following technical solution: a segmented advancing drill rod rapid grouting device, comprising:

[0006] A plurality of double-tube drill rods, each of which is a concentric double-tube structure, the inner tube is a hollow structure, and an annular channel is formed between the outer tube and the inner tube; each of the double-tube drill rods is axially drilled into the grouting hole in sequence, and each of the double-tube drill rods is detachably connected; the rearmost double-tube drill rod is used to connect to an external slurry or high-pressure water and air supply system; the inside of the borehole is defined as the front and the outside as the back.

[0007] A drill bit, with a single through hole axially opened, connected to and in communication with the end of the double-tube drill rod at the front end;

[0008] Multiple hydraulic bag infusion tubes, each of which is consistent with the length of a double-tube drill pipe; used to be axially arranged in sections in sequence in the grouting hole, detachably connected and connected in sequence front and back, and tightly fitted with the double-tube drill pipe; the hydraulic bag infusion tube at the rear end is used to be connected to the electric hydraulic pump pipeline;

[0009] The grout-stopping hydraulic bag is a hollow elastic bag-like body, which covers the outer wall of the front section of the double-tube drill pipe at the front end, and is connected and communicated with the hydraulic bag infusion tube at the front end; when the bag-like body is filled with liquid, it fits tightly with the side wall of the borehole to form a sealing area at the front of the borehole.

[0010] Furthermore, the front end of the grout-stopping hydraulic bag fits tightly with the rear end of the drill bit.

[0011] Furthermore, when the grout-stopping hydraulic bag is in a contracted state, its length is not less than 2 m, and its width is at least 2 cm less than the widest part of the drill bit.

[0012] Furthermore, a semicircular groove is axially opened on the outer wall of each double-tube drill rod for clamping the hydraulic bladder infusion tube; the inner diameter of each groove is consistent with the diameter of the hydraulic bladder infusion tube.

[0013] Furthermore, each adjacent double-tube drill rod and each adjacent hydraulic bag infusion tube are connected via a quick connector.

[0014] Furthermore, each of the adjacent double-tube drill rods and the quick connectors between the adjacent hydraulic bag infusion tubes is covered with a rubber sleeve.

[0015] Furthermore, a single tube is integrally connected between the double-tube drill rod and the drill bit at the bottom of the hole.

[0016] The present invention also discloses a segmented advancing drill rod rapid grouting system, comprising the segmented advancing drill rod rapid grouting device described above, and further comprising:

[0017] High-pressure water and air supply system, when drilling, the high-pressure water supply system is connected to the outer pipe of the double-tube drill pipe at the rear end; the high-pressure air supply system is connected to the inner pipe;

[0018] A slurry machine, connected to the inner tube and outer tube pipelines of the double-tube drill pipe at the rear end when injecting double slurry;

[0019] An electric hydraulic pump is detachably connected to a hydraulic bag infusion pipe at the rear end and is used for filling liquid into the slurry-stopping hydraulic bag.

[0020] The present invention also discloses a fast grouting method for a segmented advancing drill pipe, using the segmented advancing drill pipe fast grouting device described above, and the grouting method is as follows:

[0021] Step 1, connecting the high-pressure water and air supply system to the first double-tube drill pipe, starting the machine, and drilling a hole at the set position;

[0022] Step 2: After drilling to the depth of the double-tube drill rod, take another double-tube drill rod and a hydraulic bag infusion tube and connect them to the double-tube drill rod and the hydraulic bag infusion tube in the hole, continue drilling until the depth of the double-tube drill rod, and then continue to connect each double-tube drill rod in sequence; when the hole is drilled to the designed depth, stop drilling and directly execute step 4; when water gushing, mud bursting or hole collapse occurs during the drilling process, execute step 3;

[0023] Step 3: withdraw the connected double-tube drill pipes 20-30 cm toward the hole mouth, connect the electric hydraulic pump to the inlet pipeline of the hydraulic bag infusion tube near the hole mouth, start it, and sequentially input the liquid into the grouting hydraulic bag through the multiple hydraulic bag infusion tubes until its volume expands and sticks to the side wall of the borehole. The expanded grouting hydraulic bag forms a sealing area with the front end space of the borehole until the pressure is at least 1.5 times the designed grouting pressure, and then stop filling the liquid;

[0024] Step 4: dismantle the high-pressure water and air supply system, connect the grouting machine to the inlet pipeline of the double-tube drill pipe near the hole, start it, and let the slurry pass through the multiple double-tube drill pipes and the drill bit in sequence and be injected into the sealing area until the slurry solidifies; then discharge the liquid in the grout-stopping hydraulic bag to restore it to the contracted state;

[0025] Step 5: Repeat steps 1 to 4 until the hole is drilled to the designed depth.

[0026] The beneficial effects of the present invention are:

[0027] 1. The hole is swept to the designed depth in one time, which avoids repeated drilling and multiple withdrawal of the drill rod, greatly reduces the workload and improves the speed of grouting construction.

[0028] 2. Direct grouting using drill rods simplifies the process connection between drilling and grouting, and speeds up the construction process.

[0029] 3. A grout-stopping closed area is formed at the drill bit, the slurry diffusion area is small, the local grouting is highly targeted and accurate, the local grouting effect is more guaranteed, and the slurry loss is indirectly reduced.

Brief Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0031] Figure 2 It is a structural schematic diagram of the construction status of an embodiment of the present invention.

[0032] Figure 3 This is an enlarged cross-sectional view of the double-tube drill pipe.

[0033] Among them: 1. Stop slurry hydraulic bag, 2. Hydraulic bag infusion tube, 3. Rubber sleeve, 4. Quick connector, 5. Electric hydraulic pump, 6. Pressure gauge, 10. Drill bit, 11. Double tube drill pipe. [Specific implementation method]

[0034] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] The embodiment of the present invention discloses a segmented advancing drill rod rapid grouting device, such as Figure 1 , 2 As shown in 3, it includes: a plurality of double-tube drill rods 11, each of which is a concentric double-tube structure, both ends of which are open, the inner tube is a hollow structure, and an annular channel is formed between the outer tube and the inner tube; each double-tube drill rod 11 is used to be axially arranged in sections in sequence in the grouting hole, and the front and rear can be detachably connected and communicated in sequence, and the double-tube drill rod 11 at the rear end is used to connect the external slurry or high-pressure water and air supply system; the inside of the borehole is defined as the front, and the outside is the back. The inner tube and the outer tube can be connected through a partition arranged at intervals in sections. For the safety of grouting, a one-way valve can be installed at the front end of the annular channel and the inner tube. In order to inject slurry into the borehole, a drill bit 10 is provided, and a single through hole is opened axially, which is connected to and communicated with the end of a double-tube drill rod 11 at the front end of the hole.

[0036] Multiple hydraulic bladder infusion tubes 2, each of which is consistent with the length of a double-tube drill rod 11; used to be axially arranged in sections in sequence in the grouting hole, detachably connected and connected in sequence front and back, and tightly fit with the double-tube drill rod 11; the hydraulic bladder infusion tube 2 at the rear end is used to be connected to the pipeline of the electric hydraulic pump 5; the grouting stop hydraulic bladder 1 is a hollow elastic sac-like body, which is wrapped around the front outer wall of the double-tube drill rod 11 at the front end, and is connected and connected with the hydraulic bladder infusion tube 2 at the front end; when the bladder is filled with liquid, it fits tightly with the side wall of the borehole, forming a sealing area at the front of the borehole. The front end fits tightly with the rear end of the drill bit 10; when the bladder is filled with liquid, the bladder expands radially along the borehole; it fits tightly with the side wall of the borehole, forming a sealing area at the front of the borehole. When the liquid is released, the bladder returns to a contracted state. When the grout-stopping hydraulic bag 1 is in a contracted state, the length of the grout-stopping hydraulic bag 1 is not less than 2m, and its width is at least 2cm less than the widest part of the drill bit 10. This allows the hole slag to be discharged smoothly from the hole wall gap during the hole sweeping process; after the volume of the grout-stopping hydraulic bag 1 expands, it is close to the drill bit 10 and forms a grout-stopping area with the front end of the drill hole to prevent the grout from forming a solid body in the hole wall gap, affecting the continued drilling and slag discharge; the length of the grout-stopping hydraulic bag 1 is greater than 2m, so that it has sufficient grout-stopping sealing ability after expansion.

[0037] A semicircular groove is axially formed on the outer wall of each double-tube drill rod 11 for holding the hydraulic bladder infusion tube 2 ; the inner diameter of each groove is consistent with the diameter of the hydraulic bladder infusion tube 2 .

[0038] Each adjacent double-tube drill rod 11 and adjacent hydraulic bag infusion tube 2 are connected by a quick connector. The specification of the quick connector is various, and the quick connector suitable for pipe connection is selected, and the existing finished product is selected.

[0039] A rubber sleeve 3 is sleeved on the quick connectors between each adjacent double-tube drill rod 11 and the adjacent hydraulic bag infusion tube 2, and the rubber sleeve 3 is used to tighten and cover the connector.

[0040] The present invention also discloses a segmented advancing drill pipe fast grouting system, including the above-mentioned segmented advancing drill pipe fast grouting device, and also including: a high-pressure water and air supply system, when drilling, the high-pressure water supply system is connected to the outer pipe pipeline of a double-tube drill pipe 11 near the hole mouth; the high-pressure air supply system is connected to the inner pipe pipeline; a slurry machine, when injecting double slurry, is connected to the inner pipe and outer pipe pipeline of a double-tube drill pipe 11 near the outermost end of the hole mouth; an electric hydraulic pump 5 is detachably connected to a hydraulic bag infusion pipe 2 near the hole mouth, and is used to fill liquid into the slurry-stopping hydraulic bag 1. The high-pressure water, air supply system and slurry machine all use existing equipment, and are selected according to different construction conditions such as required pressure, speed, etc.

[0041] The present invention also discloses a segmented advancing drill pipe rapid grouting method, using the segmented advancing drill pipe rapid grouting device described above, the grouting method is as follows:

[0042] Step 1: Connect the high-pressure water and air supply system to the first double-tube drill pipe 11, start the machine, and drill a hole at the set position;

[0043] Step 2: After drilling to the depth of the double-tube drill rod 11, take another double-tube drill rod 11 and a hydraulic bag infusion tube 2 and connect them to the double-tube drill rod 11 and the hydraulic bag infusion tube 2 in the hole, and continue drilling until the depth of the double-tube drill rod 11, and then continue to connect each double-tube drill rod 11 in sequence; when the hole is drilled to the designed depth, stop drilling and directly execute step 4; when water gushing, mud bursting or hole collapse occurs during the drilling process, execute step 3;

[0044] Step 3: withdraw the connected double-tube drill pipe 11 20-30 cm toward the hole mouth side, connect the electric hydraulic pump 5 to the inlet pipeline of the hydraulic bag infusion tube 2 near the hole mouth, start it, and input the liquid into the grouting hydraulic bag 1 through multiple hydraulic bag infusion tubes 2 in sequence until its volume expands and sticks to the side wall of the borehole. The expanded grouting hydraulic bag 1 forms a sealing area with the front end space of the borehole until the pressure is at least 1.5 times the designed grouting pressure, and then stop filling the liquid;

[0045] Step 4: dismantle the high-pressure water and air supply system, connect the grouting machine to the inlet pipeline of the double-tube drill pipe 11 near the hole, start it, and let the slurry pass through multiple double-tube drill pipes 11 and the drill bit 10 in sequence and be injected into the sealing area until the slurry solidifies; then discharge the liquid in the slurry stopping hydraulic bag 1 to restore it to the contracted state;

[0046] Step 5: Repeat steps 1 to 4 until the hole is drilled to the designed depth.

[0047] The specific construction is as follows:

[0048] Drilling preparation:

[0049] A hydraulic bag infusion tube 2 is inserted into a semicircular groove on the outer wall of a double-tube drill rod 11 and tightened with a rubber sleeve 3. At this time, the hydraulic bag infusion tube 2 and the electric hydraulic pump 5 are disconnected, and the hydraulic bag infusion tube 2 and the double-tube drill rod 11 can rotate synchronously; the inner and outer tubes of the double-tube drill rod 11 are connected to high-pressure air and water respectively;

[0050] Drilling operations:

[0051] Turn on the high-pressure air and water, start the drilling rig and start drilling. After drilling a double-tube drill rod 11, extend a new double-tube drill rod 11; at the same time, use the quick connector 4 to connect a new hydraulic bag infusion tube 2, embed the new hydraulic bag infusion tube 2 into the semicircular groove on the outer wall of the new double-tube drill rod 11, and add a rubber sleeve 3 to tighten it; similarly, continuously extend the drill rod and the infusion tube to increase the drilling depth.

[0052] Grouting preparation:

[0053] If the drilling reaches the segment length designed in the grouting plan, the machine will be stopped directly; if the drilling suddenly encounters adverse geological conditions, such as water gushing, mud bursting or hole collapse, the drill rod will be withdrawn 2m and the machine will be stopped;

[0054] Connect the hydraulic bag infusion tube 2 to the electric hydraulic pump 5 through the quick connector 4, start the electric hydraulic pump 5, and inject liquid into the grouting hydraulic bag 1 through the hydraulic bag infusion tube 2 to expand its volume until the reading of the pressure gauge 6 reaches 1.5 times the designed grouting pressure, forming a good sealing grouting body and a sealing area with the front end of the borehole; remove the high-pressure air and water connected to the double-tube drill pipe 11 and connect it to the grouting machine.

[0055] Grouting operation:

[0056] A quick-setting slurry, such as polyurethane or cement-water glass double-liquid slurry, is injected into the sealing area by a grouting machine. After the grouting work of this section is completed and the slurry solidifies, the liquid in the grout-stopping hydraulic bag 1 is discharged to restore the contracted state.

[0057] Repeat the above operation to carry out drilling and grouting operations in sections until the designed drilling depth is reached and the designed grouting requirements of the hole are completed.

Claims

1. A method for rapid grouting of a segmented advancing drill pipe, characterized in that: Using a segmented advancing drill pipe rapid grouting system, the segmented advancing drill pipe rapid grouting system comprises a segmented advancing drill pipe rapid grouting device, a high-pressure water and air supply system, a grouting machine and an electric hydraulic pump (5); The segmented advancing drill rod rapid grouting device comprises: A plurality of double-tube drill rods (11), each of which is a concentric double-tube structure, wherein the inner tube is a hollow structure, and an annular channel is formed between the outer tube and the inner tube; each of the double-tube drill rods (11) is axially drilled into the grouting hole in sequence, and each of the double-tube drill rods is detachably connected; the last double-tube drill rod (11) is used to connect to a high-pressure water and air supply system; the inside of the borehole is defined as the front, and the outside is defined as the back; A drill bit (10) is provided with a single through hole in the axial direction and is connected to and communicates with the end of the double-tube drill rod (11) at the front end; A plurality of hydraulic bladder infusion tubes (2), each of which has a length consistent with that of a double-tube drill rod (11); used to be sequentially axially arranged in sections in the grouting hole, sequentially detachably connected and connected front and back, and tightly fitted with the double-tube drill rod (11); The grout-stopping hydraulic bag (1) is a hollow elastic bag-shaped body, which covers the outer wall of the front section of the double-tube drill rod (11) at the front end. The grout-stopping hydraulic bag (1) is connected and communicated with the hydraulic bag infusion tube (2) at the front end. When the bag-shaped body is filled with liquid, the grout-stopping hydraulic bag (1) expands along the radial direction of the borehole, fits tightly with the side wall of the borehole, and forms a sealing area at the front of the borehole. The front end of the grout-stopping hydraulic bag (1) is tightly fitted with the rear end of the drill bit (10); The high-pressure water and air supply system comprises a high-pressure water supply system and a high-pressure air supply system. When drilling, the high-pressure water supply system is connected to the outer pipe of the double-tube drill rod (11) at the rear end; the high-pressure air supply system is connected to the inner pipe. The slurry machine is connected to the inner tube and outer tube pipelines of the last double tube drill pipe (11) when injecting double slurry; The electric hydraulic pump (5) is detachably connected to a hydraulic bag infusion tube (2) at the rear end, and is used to fill liquid into the slurry-stopping hydraulic bag (1); The grouting method is as follows: Step 1: Connect the high-pressure water and air supply system to the first double-tube drill pipe (11), start the drilling rig, and drill a hole at the set position; Step 2: After drilling to the depth of the double-tube drill rod (11), another double-tube drill rod (11) and a hydraulic bag infusion tube (2) are taken and connected to the double-tube drill rod (11) and the hydraulic bag infusion tube (2) in the hole respectively, and the drilling is continued until the depth of the double-tube drill rod (11) is reached, and then each double-tube drill rod (11) is connected in sequence; when the drilling reaches the designed depth, the drilling is stopped and step 4 is directly executed; when water gushing, mud bursting or hole collapse occurs during the drilling process, step 3 is executed; Step 3, withdraw the connected double-tube drill pipe (11) 20-30 cm toward the hole mouth side, connect the electric hydraulic pump (5) to the inlet pipeline of the hydraulic bag infusion tube (2) near the hole mouth, start, and sequentially input the liquid into the grouting hydraulic bag (1) through the multiple hydraulic bag infusion tubes (2) until its volume expands and sticks to the side wall of the borehole. The expanded grouting hydraulic bag (1) forms a sealing area with the front end space of the borehole until the pressure is at least 1.5 times the designed grouting pressure, and then stop filling; Step 4: dismantle the high-pressure water and air supply system, connect the slurry machine to the inlet pipeline of the double-tube drill pipe (11) near the hole, start it, and allow the slurry to pass through the multiple double-tube drill pipes (11) and the drill bit (10) in sequence and be injected into the sealing area until the slurry solidifies; then discharge the liquid in the slurry-stopping hydraulic bag (1) to restore it to a contracted state; Step 5: Repeat steps 1 to 4 until the hole is drilled to the designed depth.

2. A method for rapid grouting of a segmented advancing drill pipe according to claim 1, characterized in that: A semicircular groove is axially provided on the outer wall of each double-tube drill rod (11) for holding the hydraulic bladder infusion tube (2); the inner diameter of each groove is consistent with the diameter of the hydraulic bladder infusion tube (2).

3. A method for rapid grouting of a segmented advancing drill pipe according to claim 2, characterized in that: Each adjacent double-tube drill rod (11) and adjacent hydraulic bag infusion tube (2) are connected via a quick connector.

4. A method for rapid grouting of a segmented advancing drill pipe according to claim 3, characterized in that: A rubber sleeve (3) is sleeved on each of the quick connectors between the adjacent double-tube drill rods (11) and the adjacent hydraulic bag infusion tubes (2).

5. A method for rapid grouting of a segmented advancing drill pipe according to claim 4, characterized in that: A single tube is integrally connected between the double-tube drill rod (11) and the drill bit (10) at the bottom of the hole.

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