Self-drilling grouting anchor rod and construction method

Abstract

The self-drilling type grouting anchor rod comprises a hollow anchor rod body, a two-way drilling bit is arranged on the hollow anchor rod body, a stop-grouting plug is arranged at the position, close to the upper end of the hollow anchor rod body, of the hollow anchor rod body, and a plurality of stop-grouting rings are arranged at the positions, between the two-way drilling bit and the stop-grouting plug, of the hollow anchor rod body at intervals; the grout stopping ring comprises a grout stopping ring steel inner core and bags symmetrically arranged on the grout stopping ring steel inner core, the bags are in a semi-ring shape, and grouting hoses are arranged on the bags and can penetrate through the grout stopping plug; the hollow anchor rod section between every two adjacent grout stopping rings and the hollow anchor rod section between the grout stopping ring located at the lowermost end and the two-way drilling bit are grouting sections, a plurality of grout outlet holes are evenly distributed in the grouting sections, and the outer sides of the grouting sections are further sleeved with grouting rubber sleeves; an electronic digital display angle gauge is arranged on the outer wall of the hollow anchor rod and located at the upper end of the grout stopping plug. The technical problems that grouting of a hollow grouting anchor rod in the sandy gravel stratum is diluted, diffused and difficult to solidify, and the anchor rod deviates and is poor in reinforcing effect can be effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of underground engineering, and in particular to a self-drilling grouting anchor rod and a construction method. Background Art

[0002] Rail transit is an important part of urban public transportation. During the line planning period, it is inevitable to pass through the gravel stratum. The gravel stratum has the characteristics of weak cohesion, high porosity and strong permeability. When the anchor rod is applied to the stratum for reinforcement, the hole wall is easy to fall off, the hole wall is easy to collapse during the drilling process or after the drill is lifted, the drilling efficiency is low, the drilling tool loss is large, and the drill is easily stuck or buried. In order to solve the problem of easy hole collapse in the gravel stratum, the casing wall protection method is often used for drilling, but the casing wall protection drilling construction process is complicated and the construction speed is slow. When the content of small-size pebbles is relatively high, it is easy to cause pipe blockage and even drill jam. Therefore, with the development of technology, self-drilling anchor rods have emerged. The self-drilling anchor rod consists of a drill bit, a hollow rod body, a connecting sleeve, a centering device, a nut and a pad. The anchoring system integrates drilling, grouting and anchoring functions. It is suitable for broken, difficult-to-drill, and easy-to-collapse strata. The casing wall protection is omitted during construction, which greatly improves the construction efficiency.

[0003] At present, due to the strong permeability of sand and gravel formations, the anchor slurry in the aquifer is diluted, diffused, and moved under the action of strong fluid groundwater, which does not have favorable solidification conditions, resulting in the slurry being unable to solidify and reinforce the formation normally. The on-site grouting time and grouting volume far exceed the estimated value, and the difficulty of grouting increases, which not only pollutes the groundwater environment, but also causes slurry waste, affecting the formation reinforcement effect, project construction progress and project economic benefits. In addition, during the anchoring process, the anchor often has eccentricity, which seriously affects the anchoring performance of the anchor to the formation. Traditional positioners and straighteners can only achieve the function of fixing, and cannot actively adjust the inclination and position of the anchor according to the eccentricity phenomenon. At the same time, the adjustment process accuracy is not high, which has a great impact on the anchoring performance. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a self-drilling grouting anchor rod and a construction method.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a self-drilling grouting anchor rod, comprising a hollow anchor rod, a grouting channel for grouting is provided inside the hollow anchor rod, a bidirectional drilling drill bit is provided at the lower end of the hollow anchor rod, a grouting stopper is provided near the upper end of the hollow anchor rod, a plurality of grouting stopper rings are provided on the hollow anchor rod between the bidirectional drilling drill bit and the grouting stopper plug, the grouting stopper ring comprises a grouting stopper ring steel inner core and a bladder bag symmetrically arranged on the grouting stopper ring steel inner core, the bladder bag is semi-annular, a grouting hose for grouting into the bladder bag is provided on the bladder bag, and the grouting hose can pass through the grouting stopper plug; The hollow anchor section between two adjacent grout-stopping rings is the grouting section, and the hollow anchor section between the grout-stopping ring at the bottom and the bidirectional drilling drill bit is also the grouting section. A plurality of grouting holes are evenly distributed on the grouting section, and a grouting rubber sleeve is also provided on the outer side of the grouting section. An electronic digital display angle meter is provided on the outer wall of the hollow anchor rod at the upper end of the grout stopper.

[0006] As a preferred solution, a drill threaded section is provided at the lower end of the hollow anchor rod, a drill threaded hole matching the drill threaded section is provided on the bidirectional drilling bit, drill spurs are evenly distributed on the outside of the bidirectional drilling bit, and a drill high-pressure gas channel connected to the drill threaded hole is provided at the lower end of the bidirectional drilling bit. The bidirectional drilling bit includes a forward section drilling bit located at the front end and a backward drilling bit arranged at the rear end of the forward section drilling bit. The forward section drilling bit is conical with a large front end and a small rear end, and the backward drilling bit is conical with a small front end and a large rear end.

[0007] As a preferred solution, the outer wall of the hollow anchor rod is provided with an end external thread, the grouting plug has an end internal thread matching the end external thread, and the grouting plug includes a grouting plug body and a reserved hole provided on the grouting plug body for the grouting hose to pass through.

[0008] As a preferred solution, the inner core of the grouting stop ring steel is ring-shaped, and is provided with a plurality of rotating sockets. The bag is provided with a grouting valve, and the grouting valve is connected to the grouting hose. The inner side of the inner core of the grouting stop ring steel is provided with a grouting stop internal thread, and the outer wall of the hollow anchor rod is provided with a grouting stop external thread that cooperates with the grouting stop internal thread.

[0009] The present application also provides a construction method of a self-drilling grouting anchor rod, using the above-mentioned self-drilling grouting anchor rod, the construction method steps are as follows: S1: Connect the hollow anchor rod to the drilling rig, drill an anchor hole in the sand and gravel formation at the corresponding position, drill to the designed hole depth, and then separate the drilling rig from the hollow anchor rod; S2: Install the stop ring on the hollow anchor rod through the segmented grouting thruster; S3: Install a grout stopper at the external thread of the end of the hollow anchor rod, and pass the grouting hose through the reserved hole of the grout stopper; S4: Install the electronic digital display angle meter on the outer wall of the hollow anchor rod; S5: Connect the grouting hose to the grouting equipment, and perform grouting on each stop ring from bottom to top; S6: Connect the grouting pipe to the grouting equipment and insert it into the hollow anchor rod, and perform grouting in the grouting section from bottom to top.

[0010] As a preferred solution, in step S1, during the drilling process, the grouting channel of the hollow anchor rod is connected to the air compressor through a pipeline, and the high-pressure gas in the air compressor is used to flush the sediment in the anchor hole.

[0011] As a preferred solution, in step S2, the segmented grouting propeller has a propeller hollow cavity, the inner diameter of the propeller hollow cavity is larger than the outer diameter of the hollow anchor rod, and the segmented grouting propeller includes a propeller rod body, and a rotating plug rod cooperating with the rotating plug hole is provided at the lower end of the propeller rod body; Insert the rotating rod into the rotating socket, push the stop grouting ring to the stop grouting external thread of the hollow anchor rod through the segmented grouting thruster, and then rotate the segmented grouting thruster to drive the stop grouting ring to rotate so that it is fixed at the stop grouting external thread.

[0012] As a preferred solution, in step S5, the inclination angle of the hollow anchor is obtained based on the electronic digital display angle meter, and the inclination angle of the hollow anchor is adjusted by adjusting the grouting amount and grouting pressure of the bags on the left and right sides of each grouting ring.

[0013] As a preferred solution, in step S6, a plastic grouting isolation ring is provided on the outside of the grouting pipe, a grouting channel is provided in the middle of the grouting pipe, the grouting pipe is inserted into the grouting channel, and the plastic grouting isolation ring can be deformed in the grouting channel to block the grouting channel.

[0014] As a preferred solution, in step S6, the grouting pipe is inserted into the hollow anchor rod so that the lower end of the grouting pipe is located in the grouting section that needs grouting, and the plastic grouting isolation ring is made to correspond to the grouting stop external thread above the grouting section. The grouting equipment is connected to grout the grouting section, and the slurry supports the grouting rubber sleeve through the slurry outlet hole and enters the anchor hole. This step is repeated to grout each grouting section in turn.

[0015] The beneficial effects of the present application are as follows: 1. The present application forms multiple grouting area segments by setting a plurality of grouting rings. The grouting pipe cooperates with the grouting equipment to perform segmented grouting on the water-rich section of the formation, thereby ensuring that the grouting slurry can diffuse along the fixed area, avoiding the slurry from diffusing to other areas in the borehole, solidifying and sealing the diffusion channel of the slurry, improving the effect of grouting reinforcement, and reducing the amount of grouting. It has the characteristics of simple structure, efficient construction, saving grouting volume, carbon reduction, greenness, and high promotion and applicability.

[0016] 2. The present application sets a bidirectional drilling bit on the hollow anchor rod, which can drill in the forward and backward directions of the borehole, effectively dealing with the problem of hole wall collapse and hole blocking that often occurs during drilling in sand and gravel formations, quickly performing secondary cleaning of the collapsed section, avoiding multiple disassembly and installation of the borehole, saving construction process and construction time, and having the characteristics of simple structure, clear process, easy method operation, and high popularization and applicability; and the present application sets drill bit spurs to improve drilling efficiency.

[0017] 3. The grouting stop ring structure provided by the present invention has two left and right bags. The inclination angle and position of the hollow anchor rod can be fine-tuned by adjusting the grouting pressure and grouting amount of the left and right bags. The traditional anchor rod locator cannot actively adjust the inclination angle and position deviation in the hole. The structure of the present invention has simple structure, convenient processing and strong practicality.

[0018] 4. This application uses the cooperation of a stop ring and an electronic digital angle meter to change the grouting volume and grouting pressure of the bags on the left and right sides of each stop ring to adjust the inclination angle and position of the hollow anchor rod. The method is simple, easy to operate, and has obvious effects. It has the advantages of accurate and reliable data compared to the traditional locator method, and improves the effect of anchor rod reinforcement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a construction schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the hollow anchor rod of the present invention; Figure 3 is a cross-sectional view of the slurry stopper of the present invention; Figure 4 It is a plan view of the slurry stopper of the present invention; Figure 5 It is a schematic structural diagram of the slurry stop ring of the present invention; Figure 6 It is a top view of the slurry stop ring of the present invention; Figure 7 A top view of the stop ring thruster of the present invention; Figure 8 This is a cross-sectional view of the stop ring propeller of the present invention. Fig. 9 is a cross-sectional view of a grouting pipe of the present invention; Fig.10 is a cross-sectional view of a bidirectional drilling drill bit of the present invention; Fig.11 It is a structural schematic diagram of the electronic digital display angle meter of the present invention; Fig.12 It is a structural schematic diagram of the grouting rubber sleeve of the present invention.

[0020] Markings in the figure: 1, sand and gravel formation; 2, anchor drilling hole; 3. Hollow anchor rod; 3-1. Grouting channel; 3-2. Drill bit thread section; 3-3. External thread of end; 3-4. External thread of stop grout; 3-5. Grouting hole; 3-6. Grouting rubber sleeve; 4. Stop grout ring; 4-1. Bag; 4-2. Grouting hose; 4-3. Rotary socket; 4-4. Grouting valve; 4-5. Steel inner core of stop grout ring; 4-6. Internal thread of stop grout; 4-7. Intermediate layer; 5. Stop grout plug; 5-1. Stop grout plug body; 5-2. Reserved hole; 5-3. Internal thread of stop grout plug; 6. Electronic digital display angle meter; 7. Segmented grouting thruster; 7-1, connecting thread; 7-2, thruster rod body; 7-3, rotating plug rod; 7-4, connecting sleeve; 7-5, extension rod; 7-6, extension rod thread; 7-7-thruster hollow cavity; 8, grouting pipe; 8-1, grouting channel; 8-2, plastic grouting isolation ring; 9, bidirectional drilling bit; 9-1, backward drilling bit; 9-2, forward drilling bit; 9-3, drill bit spurs; 9-4, drill bit high-pressure gas channel; 9-5, drill bit threaded hole; 10, laser point light source emitting device. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that in the description of the present invention, unless otherwise specified, the meaning of "multiple" is two or more; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] See also Figure 1-12The present invention provides a self-drilling grouting anchor rod, comprising a hollow anchor rod 3, wherein the hollow anchor rod 3 has a grouting channel 3-1 for grouting inside, a bidirectional drilling drill bit 9 is provided at the lower end of the hollow anchor rod 3, a grouting stopper 5 is provided near the upper end of the hollow anchor rod 3, and a plurality of grouting stopper rings 4 are arranged between the bidirectional drilling drill bit 9 and the grouting stopper 5 on the hollow anchor rod 3, wherein the grouting stopper ring 4 comprises a grouting stopper ring steel inner core 4-5 and a bag 4-1 symmetrically arranged on the grouting stopper ring steel inner core 4-5, wherein the bag 4-1 is semi-circular. The bag 4-1 is provided with a grouting hose 4-2 for grouting into the bag 4-1, and the grouting hose 4-2 can pass through the grouting stop plug 5; the hollow anchor section between two adjacent grouting stop rings 4 is the grouting section, and the hollow anchor section between the lowermost grouting stop ring 4 and the bidirectional drilling drill bit 9 is also the grouting section, and a plurality of grouting holes 3-5 are evenly distributed on the grouting section, and a grouting rubber sleeve 3-6 is also sleeved on the outer side of the grouting section; an electronic digital display angle meter 6 is provided on the outer wall of the hollow anchor 3 at the upper end of the grouting stop plug 5.

[0023] Among them, a drill threaded section 3-2 is provided at the lower end of the hollow anchor rod 3, a drill threaded hole 9-5 is provided on the bidirectional drilling bit 9 and the drill threaded hole 9-5 is matched with the drill threaded section 3-2, drill spurs 9-3 are evenly distributed on the outer side of the bidirectional drilling bit 9, and a drill high-pressure gas channel 9-4 connected with the drill threaded hole 9-5 is provided at the lower end of the bidirectional drilling bit 9. The bidirectional drilling bit 9 includes a forward section drilling bit 9-2 located at the front end and a backward drilling bit 9-1 arranged at the rear end of the forward section drilling bit 9-2. The forward section drilling bit 9-2 and the backward drilling bit 9-1 are made of one piece. The forward section drilling bit 9-2 is conical with a large front end and a small rear end. The backward drilling bit 9-1 is conical with a small front end and a large rear end. The drill spurs 9-3 are made of high-strength gold.

[0024] The present application sets a bidirectional drilling bit 9 on the hollow anchor rod 3, which can drill along the forward and backward directions of the borehole, and effectively handles the problem of hole wall collapse and hole blocking that often occurs during drilling in sand and gravel formations, and quickly performs secondary cleaning of the collapsed section to avoid multiple disassembly and installation of the borehole, thus saving construction process and construction time. The application has the characteristics of simple structure, clear process, easy method operation and high popularization and applicability; and the present application sets drill bit spikes 9-3 to improve drilling efficiency.

[0025] Specifically, the outer wall of the hollow anchor rod 3 is provided with an end external thread 9-3, the grouting plug 5 has a grouting plug internal thread 5-3 that cooperates with the end external thread 9-3, and the grouting plug 5 includes a grouting plug body 5-1 and a reserved hole 5-2 arranged on the grouting plug body 5-1 for the grouting hose 4-2 to pass through, and there are four reserved holes 5-2.

[0026] In addition, the steel inner core 4-5 of the grout-stop ring is ring-shaped, and a plurality of rotating sockets 4-3 are arranged on the steel inner core 4-5 of the grout-stop ring. The two bags 4-1 are separated by a partition layer 4-7, and a grouting valve 4-4 is arranged on the bag 4-1. The grouting valve 4-4 is connected to the grouting hose 4-2. A grout-stop internal thread 4-6 is arranged on the inner side of the steel inner core 4-5 of the grout-stop ring, and a grout-stop external thread 3-4 cooperating with the grout-stop internal thread 4-6 is arranged on the outer wall of the hollow anchor rod 3.

[0027] The present application also provides a construction method for a self-drilling grouting anchor rod, and the construction method steps of the self-drilling grouting anchor rod are as follows: S1: Use a total station to determine the position and angle of the anchor hole in the sand and gravel formation, connect the hollow anchor 3 to the drilling rig, drill the anchor hole 2 in the sand and gravel formation 1 at the corresponding position, drill to the designed hole depth, and then separate the drilling rig from the hollow anchor 3; S2: Install the stop ring 4 on the hollow anchor rod 3 through the segmented grouting thruster 7; S3: Install the grout stopper 5 at the external thread 9-3 of the end of the hollow anchor rod 3, and pass the grouting hose 4-2 through the reserved hole 5-2 of the grout stopper 5; S4: Install the electronic digital display angle meter 6 on the outer wall of the hollow anchor rod 3; S5: Connect the grouting hose 4-2 to the grouting equipment, and perform grouting on each grout stop ring 4 from bottom to top; S6: Connect the grouting pipe 8 to the grouting equipment and insert it into the hollow anchor rod 3, and perform grouting in the grouting section from bottom to top.

[0028] Among them, in the construction requirements of this embodiment, the angle between the anchor rod and the horizontal plane is set to 10°, and a YT28 hand-held pneumatic drill is used for drilling. In step S1, during the drilling process, the grouting channel 3-1 of the hollow anchor rod 3 is connected to the air compressor through a pipeline, and the high-pressure gas in the CA160-130 air compressor is used to flush the sediment in the anchor hole 2, and the sediment is flushed out of the anchor hole 2. If the wall of the anchor hole 2 collapses during the drilling process, the collapsed body of the collapsed hole section is cleaned by retracting the drilling bit 9-1 of the bidirectional drilling bit 9, and the sediment is flushed out of the anchor hole 2 by the high-pressure gas of the CA160-130 compressor.

[0029] In step S2, the segmented grouting thruster 7 has a thruster hollow cavity 7-7, the inner diameter of the thruster hollow cavity 7-7 is larger than the outer diameter of the hollow anchor rod 3, the segmented grouting thruster 7 includes a thruster rod body 7-2, and the lower end of the thruster rod body 7-2 is provided with a rotating plug rod 7-3 that cooperates with the rotating socket 4-3, the rotating plug rod 7-3 is inserted into the rotating socket 4-3, and the stop grout ring 4 is pushed to the stop grout external thread 3-4 of the hollow anchor rod 3 by the segmented grouting thruster 7, and then the segmented grouting thruster 7 is rotated to drive the stop grout ring 4 to rotate, so that it is fixed at the stop grout external thread 3-4.

[0030] Furthermore, the upper end of the thruster rod body 7-2 is connected to an extension rod 7-5 via a connecting sleeve 7-4, and an internal mounting thread is provided in the connecting sleeve 7-4. A connecting thread 7-1 matching the internal mounting thread is provided at the upper end of the thruster rod body 7-2, and extension rod threads 7-6 matching the internal mounting thread are provided at the upper and lower ends of the extension rod 7-5, respectively. Multiple extension rods 7-5 or multiple connecting sleeves 7-4 can be used as needed to increase the length of the segmented grouting thruster 7, which has a wide range of applications.

[0031] In step S4, the hollow anchor rod 3 is fixed in a hole mouth positioning fixture. The existing commonly used hole mouth positioning fixture can be used. The electronic digital display angle meter 6 is a magnetic angle meter. The magnetic surface is placed against the hollow anchor rod 3, and the surface is parallel to the axis of the hollow anchor rod 3. The angle meter is adsorbed on the surface of the hollow anchor rod 3, and the inclined position of the grouting plug 5 in the anchor hole 2 is adjusted according to the designed inclination angle of the anchor rod.

[0032] In step S5, the inclination angle of the hollow anchor rod 3 is obtained based on the electronic digital display angle meter 6, and the inclination angle of the hollow anchor rod 3 is adjusted by adjusting the grouting amount and grouting pressure of the bags 4-1 on the left and right sides of each grout-stopping ring 4.

[0033] In step S6, a plastic grouting isolation ring is provided on the outside of the grouting pipe 8, a grouting channel 8-1 is provided in the middle of the grouting pipe 8, the grouting pipe 8 is inserted into the grouting channel 3-1, and the plastic grouting isolation ring can be deformed in the grouting channel 3-1 to block the grouting channel 3-1.

[0034] In step S6, the grouting pipe 8 is inserted into the hollow anchor rod 3, so that the lower end of the grouting pipe 8 is located in the grouting section that needs grouting, and the plastic grouting isolation ring is made to correspond to the grouting stop external thread 3-4 above the grouting section, and the grouting equipment is connected to grout the grouting section. The grouting pressure increases, and the slurry props up the grouting rubber sleeve 3-6 through the grouting hole 3-5 to enter the anchor hole 2. The grouting rubber sleeve 3-6 can prevent the slurry from flowing back, and the grouting stop ring 4 can ensure that the grouting slurry can diffuse along the fixed area to prevent the slurry from diffusing to other areas in the borehole, solidify and block the diffusion channel of the slurry, thereby improving the utilization rate of the grouting slurry and the effect of grouting reinforcement, and reducing the amount of grouting. When the grouting reaches the requirement of stopping grouting, stop grouting, and flush the 8-hollow anchor rod grouting pipe to prevent the slurry from blocking the grouting channel 8-1. Repeat this step to grout each grouting section in turn.

[0035] Of course, the present invention is not limited to the above-described embodiments. Several other embodiments based on the design concept of the present invention are also provided below.

[0036] For example, in other embodiments, different from the embodiments described above, the present application also includes a correction system, which includes a controller, a laser point light source emitting device, a receiving board and a grouting pump. The controller can be a PLC controller, and the laser point light source emitting device 10 is a TTL modulated red light point laser. The controller is electrically connected to the laser point light source emitting device, the electronic digital display angle meter 6 and the grouting pump. The laser point light source emitting device 10 is installed at the upper end of the hollow anchor rod 3.

[0037] In this embodiment, there are four stop grouting rings 4, and the four stop grouting rings 4 from bottom to top are defined as "first inclination adjustment stop grouting ring", "first position adjustment stop grouting ring", "second inclination adjustment stop grouting ring", and "second position adjustment stop grouting ring". The two grouting hoses 4-2 on the "first inclination adjustment stop grouting ring" are marked with labels 1a and 1b respectively, and the two grouting hoses 4-2 on the "first position adjustment stop grouting ring" are marked with labels 2a and 2b respectively, and the two grouting hoses 4-2 on the "second inclination adjustment stop grouting ring" are marked with labels 3a and 3b respectively, and the two grouting hoses 4-2 on the "second position adjustment stop grouting ring" are marked with labels 4a and 4b respectively. The length of the bag 4-1 is 80mm, and the outer diameter and inner diameter of the bag 4-1 are 50mm and 35mm respectively, and the grouting amount on both sides is Q=40.05 cm 3 , the maximum grouting pressure Fpressure = 0.5MPa.

[0038] In step S5, when the inclination angle of the hollow anchor rod 3 is adjusted, the laser point light source emitting device 10 is turned on, and the center of the hollow anchor rod 3 is adjusted according to the center position of the anchor hole (2) to ensure that the center of the anchor hole (2) and the center position of the hollow anchor rod 3 coincide with each other. A laser point receiving plate is set at a suitable position, and the size of the receiving plate is 150mm×150mm. The laser point position (0mm, 0mm) initially marked on the receiving plate is recorded, so that the adjustment accuracy can be easily controlled in the later adjustment process.

[0039] Connect the grouting pump to each grouting hose 4-2, and grout the four stop rings 4 from bottom to top. The grouting ratio is 0.48 in water-cement ratio. The initial reading of the electronic digital display angle meter 6 is 9.0°. The design angle between the anchor rod and the horizontal plane is 10°. The laser point position on the receiving plate is (5.1mm, 6.5mm). Grout the deviation side. The graded grouting volume 0.2Q is 8.10cm 3 , the graded grouting pressure is 0.2F and 0.1MPa: The whole regulation process is as follows: The first stage grouting of 8.10 cm is performed on the grouting hose (4-2) No. 1a of the "first inclination adjustment stop ring" 3After the grouting is completed, the electronic digital display angle meter shows an angle of 9.2°, and the laser point position on the receiving plate is (5.8mm, 6.9mm); The first stage grouting of 8.10cm is carried out on the grouting hose (4-2) No. 2a of the "First Position Adjustment Stop Ring" 3 After the grouting is completed, the electronic digital display angle meter shows an angle of 9.1°, and the laser point position on the receiving plate is (4.2mm, 5.6mm); The first stage grouting of 8.10 cm is performed on the grouting hose (4-2) No. 3a of the "Second Angle Adjustment Stop Ring" 3 After the grouting is completed, the electronic digital display angle meter shows an angle of 9.8°, and the laser point position on the receiving plate is (4.5mm, 6.2mm); The first grouting of the grouting hose (4-2) No. 4a of the "Second Position Adjustment Stop Ring" is 8.10 cm 3 After the grouting is completed, the electronic digital display angle meter shows an angle of 10.2°, and the laser point position on the receiving plate is (3.2mm, 5.4mm); The first stage grouting of 8.10cm is carried out on the grouting hose (4-2) No. 1b of the "first inclination adjustment stop ring" 3 After the grouting is completed, the electronic digital display angle meter shows an angle of 9.6°, and the laser point position on the receiving plate is (3.8mm, 5.9mm); The second stage grouting of 8.10cm is carried out on the grouting hose (4-2) No. 2a of the "first position adjustment grouting ring" 3 After the grouting is completed, the electronic digital display angle meter shows an angle of 10.5°, and the laser point position on the receiving plate is (2.3mm, 3.6mm); The first stage grouting of 8.10cm is carried out on the grouting hose (4-2) No. 3b of the "Second Angle Adjustment Stop Ring" 3 After the grouting is completed, the electronic digital display angle meter shows an angle of 9.8°, and the laser point position on the receiving plate is (3.1mm, 4.2mm); The grouting hose (4-2) No. 4b of the "second position adjustment stop ring" was grouted for the first time with 8.10 cm3 of grouting. After the grouting was completed, the electronic digital display angle meter showed an angle of 10.2°, and the laser point position on the receiving plate was (1.2 mm, 2.2 mm); The second stage grouting of 8.10cm is carried out on the grouting hose (4-2) No. 1b of the "first inclination adjustment stop ring" 3 After the grouting is completed, the electronic digital display angle meter shows an angle of 9.9°, and the laser point position on the receiving plate is (1.8mm, 2.9mm); The first stage grouting of 8.10cm is carried out on the grouting hose (4-2) No. 2b of the "First Position Adjustment Stop Ring" 3 After the grouting is completed, the electronic digital display angle meter shows an angle of 10.1°, and the laser point position on the receiving plate is (0.8mm, 1.6mm); The second stage grouting of 8.10cm is carried out on the grouting hose (4-2) No. 3b of the "Second Angle Adjustment Stop Ring" 3 After the grouting is completed, the analysis module analyzes the data and obtains the reading of the sub-digital display angle meter as 10.0°, and the position of the laser point on the receiving plate is (1.1mm, 1.9mm); The second stage grouting of 8.10cm is carried out on the grouting hose (4-2) No. 4b of the "Second Position Adjustment Stop Ring" 3 After the grouting is completed, the electronic digital display angle meter shows an angle of 10.1°, and the laser point position on the receiving plate is (0.1mm, 0.6mm); The third stage of grouting 8.10cm is applied to the grouting hose (4-2) No. 1b of the "first inclination adjustment stop ring" 3 After the grouting is completed, the electronic digital display angle meter shows an angle of 10.0°, and the laser point position on the receiving plate is (-0.3mm, 0.3mm); The third stage of grouting 8.10cm for the grouting hose (4-2) No. 2a of the "first position adjustment grouting ring" 3 After the grouting is completed, the electronic digital display angle meter shows an angle of 10.1°, and the laser point position on the receiving plate is (0.1mm, -0.1mm); The third stage of grouting 8.10cm is injected into the grouting hose (4-2) No. 3b of the "Second Angle Adjustment Stop Ring" 3 After the grouting is completed, the electronic digital display angle meter shows an angle of 10.0°, and the laser point position on the receiving plate is (0.0mm, 0.0mm), thereby completing the adjustment of the anchor position deviation. After the adjustment is completed, the laser point light source emitting device 10 is removed from the hollow anchor 3 and the subsequent steps are continued.

[0040] It should be noted that the above embodiments are only used to illustrate the present invention, but the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the present invention.

Claims

1. A self-drilling grouting anchor, characterized in that: The invention comprises a hollow anchor rod (3), wherein the hollow anchor rod (3) has a grouting channel (3-1) for grouting inside, a bidirectional drilling drill bit (9) is provided at the lower end of the hollow anchor rod (3), a grouting stopper (5) is provided near the upper end of the hollow anchor rod (3), a plurality of grouting stopper rings (4) are arranged at intervals between the bidirectional drilling drill bit (9) and the grouting stopper plug (5) on the hollow anchor rod (3), the grouting stopper ring (4) comprises a grouting stopper ring steel inner core (4-5) and a bag (4-1) symmetrically arranged on the grouting stopper ring steel inner core (4-5), the bag (4-1) is semi-annular, a grouting hose (4-2) for grouting into the bag (4-1) is provided on the bag (4-1), and the grouting hose (4-2) can pass through the grouting stopper plug (5); The hollow anchor section between two adjacent grout-stopping rings (4) is a grouting section, and the hollow anchor section between the lowest grout-stopping ring (4) and the bidirectional drilling drill bit (9) is also a grouting section. The grouting section is evenly distributed with a plurality of grouting holes (3-5), and a grouting rubber sleeve (3-6) is also sleeved on the outer side of the grouting section. An electronic digital display angle meter (6) is provided on the outer wall of the hollow anchor rod (3) and located above the grout stopper (5).

2. A self-drilling grouting anchor according to claim 1, characterized in that: A drill thread section (3-2) is provided at the lower end of the hollow anchor rod (3); a drill thread hole (9-5) is provided on the bidirectional drilling bit (9) and is threadedly matched with the drill thread section (3-2); drill thorns (9-3) are evenly distributed on the outer side of the bidirectional drilling bit (9); a drill high-pressure gas passage (9-4) is provided at the lower end of the bidirectional drilling bit (9) and is connected with the drill thread hole (9-5); the bidirectional drilling bit (9) comprises a forward drilling bit (9-2) located at the front end and a backward drilling bit (9-1) arranged at the rear end of the forward drilling bit (9-2); the forward drilling bit (9-2) is tapered with a large front end and a small rear end; the backward drilling bit (9-1) is tapered with a small front end and a large rear end.

3. A self-drilling grouting anchor according to claim 2, characterized in that: The outer wall of the hollow anchor rod (3) is provided with an end external thread (9-3), the grouting plug (5) has a grouting plug internal thread (5-3) that matches the end external thread (9-3), and the grouting plug (5) comprises a grouting plug body (5-1) and a reserved hole (5-2) provided on the grouting plug body (5-1) for the grouting hose (4-2) to pass through.

4. A self-drilling grouting anchor according to claim 3, characterized in that: The stop ring steel inner core (4-5) is ring-shaped, a plurality of rotation sockets (4-3) are provided on the stop ring steel inner core (4-5), a grouting valve (4-4) is provided on the bag (4-1), the grouting valve (4-4) is connected to the grouting hose (4-2), a stop ring steel inner core (4-5) is provided with a stop ring internal thread (4-6) on the inner side, and a stop ring external thread (3-4) matching the stop ring internal thread (4-6) is provided on the outer wall of the hollow anchor rod (3).

5. A construction method of a self-drilling grouting anchor, characterized in that: Using the self-drilling grouting anchor rod described in claim 4, the construction method steps are as follows: S1: Connecting the hollow anchor rod (3) to a drilling rig, drilling an anchor hole (2) in the sand and gravel stratum (1) at a corresponding position until the hole reaches a designed depth, and then separating the drilling rig from the hollow anchor rod (3); S2: installing the grout stop ring (4) on the hollow anchor rod (3) by means of a segmented grouting thruster (7); S3: Install a grout stopper (5) at the external thread (9-3) at the end of the hollow anchor rod (3), and pass the grouting hose (4-2) through the reserved hole (5-2) of the grout stopper (5); S4: Installing the electronic digital display angle meter (6) on the outer wall of the hollow anchor rod (3); S5: Connect the grouting hose (4-2) to the grouting equipment, and perform grouting on each grouting stop ring (4) from bottom to top; S6: Connect the grouting pipe (8) to the grouting equipment and insert it into the hollow anchor rod (3), and perform grouting in the grouting section from bottom to top.

6. A construction method of a self-drilling grouting anchor according to claim 5, characterized in that: In step S1, during the drilling process, the grouting channel (3-1) of the hollow anchor rod (3) is connected to an air compressor via a pipeline, and the high-pressure gas in the air compressor is used to flush the sediment in the anchor hole (2).

7. A construction method of a self-drilling grouting anchor according to claim 5, characterized in that: In step S2, the segmented grouting propeller (7) has a propeller hollow cavity (7-7), the inner diameter of the propeller hollow cavity (7-7) is larger than the outer diameter of the hollow anchor rod (3), the segmented grouting propeller (7) comprises a propeller rod body (7-2), and a rotating plug rod (7-3) cooperating with the rotating plug hole (4-3) is provided at the lower end of the propeller rod body (7-2); The rotating plug rod (7-3) is inserted into the rotating plug hole (4-3), and the stop grout ring (4) is pushed to the stop grout external thread (3-4) of the hollow anchor rod (3) by the segmented grouting thruster (7). Then, the segmented grouting thruster (7) is rotated to drive the stop grout ring (4) to rotate so that the stop grout external thread (3-4) is fixed.

8. The construction method of a self-drilling grouting anchor according to claim 5, characterized in that: In step S5, the inclination angle of the hollow anchor rod (3) is obtained based on the electronic digital display angle meter (6), and the inclination angle of the hollow anchor rod (3) is adjusted by adjusting the grouting amount and grouting pressure of the bags (4-1) on the left and right sides of each grouting stop ring (4).

9. A construction method of a self-drilling grouting anchor according to claim 5, characterized in that: In step S6, a plastic grouting isolation ring is provided on the outside of the grouting pipe (8), a grouting channel (8-1) is provided in the middle of the grouting pipe (8), the grouting pipe (8) is inserted into the grouting channel (3-1), and the plastic grouting isolation ring can be deformed in the grouting channel (3-1) to block the grouting channel (3-1).

10. A construction method of a self-drilling grouting anchor according to claim 9, characterized in that: In step S6, the grouting pipe (8) is inserted into the hollow anchor rod (3), so that the lower end of the grouting pipe (8) is located in the grouting section that needs grouting, and the plastic grouting isolation ring is aligned with the grouting stop external thread (3-4) above the grouting section. The grouting equipment is connected to grout the grouting section, and the grouting liquid props up the grouting rubber sleeve (3-6) through the grouting hole (3-5) and enters the anchor hole (2). This step is repeated to grout each grouting section in turn.

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