System anchor rod device and method for radial grouting

Abstract

The invention relates to the technical field of tunnel construction, and provides a system anchor rod device and method for radial grouting. The system anchor rod device for radial grouting comprises an anchor rod, an anchor rod grouting pipe and a grout stopping device. An anchor head is arranged at one end, in the length direction, of the anchor rod. The anchor rod grouting pipe is located outside the anchor rod and extends in the length direction of the anchor rod. The grout stopping device comprises a grout stopping bag and a grout stopping and grouting pipe, the grout stopping bag wraps the periphery of the anchor rod and the periphery of the anchor rod grouting pipe and is arranged close to the end, away from the anchor head in the length direction, of the anchor rod, and the grout stopping and grouting pipe is connected with the grout stopping bag and used for injecting grout into the grout stopping bag so that the injected grout can extrude the hole wall of the anchor rod to achieve the grout stopping effect. In this way, the grouting pressure can be improved, grout can better permeate into a loose circle generated when an anchor rod hole is drilled, meanwhile, the grout can better permeate into surrounding rock cracks, the anchor rod supporting strength is greatly improved, the effect of well supporting a rock stratum is achieved, and the construction process is simple and rapid.

Description

Technical Field

[0001] The present application relates to the technical field of tunnel construction, and particularly to a system anchor rod device and method for radial grouting. Background Art

[0002] The system anchor rod for radial grouting (i.e., radial anchor rod), as a part of the shotcrete support in the flexible support of the New Austrian Tunneling Method (NATM) construction, plays a crucial role in controlling stress and strain during tunnel construction to ensure tunnel construction safety. The characteristics of the NATM anchor rod grouting are low-pressure grouting, with a sealing plate provided on the surface of the anchor rod orifice, and the grout is a low water-cement ratio grout to reduce its fluidity. This method can basically ensure the coupling between the anchor rod and the anchor rod hole wall, achieving the effect of the cooperation between the anchor rod and the initial support to realize the shotcrete support.

[0003] However, the existing system anchor rods for radial grouting have a low degree of fit with the NATM construction, resulting in the system anchor rods being unable to play their due role in the NATM construction. The specific problems existing in the existing system anchor rods for radial grouting are as follows: (1) When the existing system anchor rods are normally grouted, the grouting pressure is at a relatively low level, making it difficult to compact and penetrate the loosened zone that appears due to impact and vibration during the drilling of the anchor rod holes, resulting in poor bonding between the grout and the grouting area, insufficient fixing strength of the anchor rod, low pulling force, and being unable to play the role of supporting the rock formation; (2) The grouting slurry of the existing system anchor rods has a low adaptability to the anchor rod grouting. The slurry with a high water-cement ratio has strong fluidity and is easy to penetrate the rock wall, but it is easy to seep out from the gap between the anchor rod and the drilled anchor rod hole, affecting the grouting effect and having a long solidification time; while the slurry with a low water-cement ratio has poor fluidity and good solidification, but has poor permeability to the rock wall and requires a higher grouting pressure to achieve compaction and penetration; (3) The construction efficiency of the existing system anchor rods is low, and the processes of hole layout, anchor rod installation, and grouting and grout stopping all require a long time to execute, with a long required time. Summary of the Invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a system anchor rod device and method for radial grouting.

[0005] The first aspect of the present application provides a system anchor rod device for radial grouting, including: An anchor rod, one end of which along the length direction is provided with an anchor head; An anchor rod grouting pipe, which is located outside the anchor rod and extends along the length direction of the anchor rod; Grout stopping device, the grout stopping device includes a grout stopping bag and a grout stopping grouting pipe. The grout stopping bag is wrapped around the periphery of the anchor rod and the anchor rod grouting pipe, and is arranged near one end of the anchor rod along the length direction away from the anchor head. The grout stopping grouting pipe is connected to the grout stopping bag and is used to inject grout into the grout stopping bag, so that the injected grout squeezes the hole wall of the anchor rod to play a grout stopping role.

[0006] In some embodiments, the systematic anchor rod device further includes a backing plate and an anchor rod nut; External threads are provided on a part of the outer peripheral surface of the anchor rod, and the external threads are arranged near one end of the anchor rod along the length direction away from the anchor head. The backing plate and the anchor rod nut are sequentially sleeved on the anchor rod through one end of the anchor rod along the length direction away from the anchor head, and the anchor rod nut is threadedly connected to the external threads to fix the anchor rod and the backing plate.

[0007] In some embodiments, mounting holes for the fastening bolts to pass through are formed on the backing plate to fix the backing plate to the concrete closed surface arranged on the ground through the fastening bolts; And / or, a first through hole for the anchor rod grouting pipe to pass through and a second through hole for the grout stopping grouting pipe to pass through are formed on the backing plate.

[0008] In some embodiments, the grout stopping bag is a film bag woven from fiber cloth. The grout stopping bag has a receiving cavity arranged around the anchor rod. Both ends of the grout stopping bag along the length direction of the anchor rod are sealed. The grout stopping grouting pipe is connected to one end of the grout stopping bag relatively far from the anchor head and is communicated with the receiving cavity to inject grout into the receiving cavity.

[0009] In some embodiments, the length of the grout stopping bag along the length direction of the anchor rod is greater than 0.5 meters.

[0010] In some embodiments, grouting pipe holes are formed at both ends of the grout stopping bag along the length direction of the anchor rod. The anchor rod grouting pipe is inserted into the grouting pipe holes, and one end of the anchor rod grouting pipe along the length direction passes through the grouting pipe hole and extends towards the direction close to the anchor head; Wherein, the distance between one end of the anchor rod grouting pipe close to the anchor head and the anchor head is greater than 1 meter, and the distance that one end of the anchor rod grouting pipe close to the anchor head extends beyond the grout stopping bag is greater than 0.5 meter.

[0011] In some embodiments, the systematic anchor rod device further includes a steel pipe. The steel pipe is sleeved on a part of the rod section of the anchor rod. The setting position of the grout stopping bag on the anchor rod corresponds to that of the steel pipe, and the grout stopping bag is wrapped around the periphery of the steel pipe.

[0012] In some embodiments, on the outer peripheral surface of the anchor head, there are anchor head ramps arranged oppositely along the radial direction of the anchor head; and / or, on the outer peripheral surface of the anchor head, there are anchor head annular grooves to increase the friction of the outer peripheral surface of the anchor head by using the anchor head annular grooves.

[0013] The second aspect of the present application provides a system anchor rod method for radial grouting. Using the system anchor rod device for radial grouting as described in any of the above embodiments, this method includes the following steps: S1, drilling an anchor rod hole with a preset angle in the rock mass; S2, installing a grout stop device and an anchor rod grouting pipe on the anchor rod and then placing them into the anchor rod hole; S3, grouting the grout stop bag of the grout stop device through the grout stop grouting pipe of the grout stop device; [[ID=-11]]S4, after the slurry in the grout stop bag reaches a preset strength value, grouting the anchor rod hole through the anchor rod grouting pipe.

[0014] In some embodiments, in S2, the length of the grout stop bag along the length direction of the anchor rod is greater than 0.5 meters, the distance from the end of the anchor rod grouting pipe extending into the anchor rod hole to the bottom of the anchor rod hole is greater than 1 meter, and the distance from the end of the anchor rod grouting pipe extending into the anchor rod hole exceeding the grout stop bag is greater than 0.5 meters; and / or, in S3, the slurry for grouting the grout stop bag through the grout stop grouting pipe uses a low water-cement ratio with a water-cement ratio less than or equal to 0.75, and an external coagulant is added to the slurry to accelerate the setting speed; and / or, in S4, the slurry for grouting the anchor rod hole through the anchor rod grouting pipe uses a low water-cement ratio with a water-cement ratio less than or equal to 0.75, and the grouting pressure is greater than or equal to 2 MPa and less than or equal to 7.5 MPa.

[0015] The technical solution provided by the embodiments of the present application has the following advantages compared with the prior art: It should be noted that there is a "-" in the line number "ID=11" in the original text. It is not clear if this is a mistake. If it is a mistake, it should be corrected to a positive number for normal line numbering. The above translation is based on the original text provided.The system bolt device and method for radial grouting provided by the present application, by installing a special grout stop device on the bolt, the grout stop device includes a grout stop bag and a grout stop grouting pipe. The grout stop bag is wrapped around the periphery of the bolt and the bolt grouting pipe, and is arranged near one end of the bolt along the length direction away from the anchor head. The grout stop grouting pipe is connected to the grout stop bag and is used to inject grout into the grout stop bag. With such a setting, when constructing the system bolt, the bolt installed with the grout stop device and the bolt grouting pipe can be placed into the bolt hole, and the grout stop bag is grouted through the grout stop grouting pipe. The injected grout is used to squeeze the bolt hole wall to play a grout stop role. Thus, when grouting the bolt hole through the bolt grouting pipe subsequently, the grout stop device can be used to well prevent the seepage of grout. In this way, when grouting the bolt hole through the bolt grouting pipe subsequently, the grouting pressure can be increased, so that the grout can better penetrate into the loosened zone generated when drilling the bolt hole, and at the same time, the grout can better penetrate into the surrounding rock fissures, thereby greatly enhancing the bolt support strength. At the same time, through the higher grouting pressure, both the coupling effect between the bolt and the bolt hole wall is ensured, and the surrounding rock is reinforced, so that the pulling force of the bolt is greatly improved. In addition, by installing a special grout stop device on the bolt, the adaptability of the grouting slurry to the bolt grouting is increased. By increasing the grouting pressure and combining with a low water-cement ratio, it can ensure better compaction and penetration of the grout with the surrounding rock. By combining the grout stop device with a higher water-cement ratio liquid, while ensuring better compaction and penetration of the grout with the surrounding rock, the seepage of grout can be effectively avoided. In addition, the process of this construction method is relatively simple, and this special grout stop device can be produced on behalf of the factory, so that the construction efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the system bolt device for radial grouting provided by the embodiment of the present application; Figure 2 For Figure 1 It is a structural schematic diagram of the grout stop device part of the system bolt device for radial grouting shown; Figure 3 For Figure 1 It is a structural schematic diagram of the backing plate part of the system bolt device for radial grouting shown; Figure 4 is Figure 1 The structural schematic diagram of the anchor head part of the system anchor rod device for radial grouting shown in the figure; Figure 5 is Figure 1 The sectional structural schematic diagram of the system anchor rod device for radial grouting shown in the figure; Figure 6 The flow schematic diagram of the system anchor rod method for radial grouting provided by the embodiment of the present application.

[0019] Among them, 1. Anchor rod; 2. Anchor rod grouting pipe; 3. Grout stop bag; 31. Grouting pipe hole; 4. Grout stop grouting pipe; 5. Grout stop connector; 6. Backing plate; 61. First through hole; 62. Second through hole; 7. Anchor rod nut; 8. Fastening bolt; 9. Steel pipe; 10. Anchor head; 101. Anchor head slope; 102. Anchor head annular thread. Specific embodiments

[0020] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present application, the solutions of the present application will be further described below. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to fully understand the present application, but the present application can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present application, rather than all the embodiments.

[0022] As Figures 1 to 5 shown, some embodiments of the present application provide a system anchor rod device for radial grouting, including: an anchor rod 1, an anchor rod grouting pipe 2 and a grout stop device.

[0023] Among them, one end of the anchor rod 1 in the length direction is provided with an anchor head 10; the anchor rod grouting pipe 2 is located outside the anchor rod 1 and extends along the length direction of the anchor rod 1; the grout stop device includes a grout stop bag 3 and a grout stop grouting pipe 4, the grout stop bag 3 is wrapped around the periphery of the anchor rod 1 and the anchor rod grouting pipe 2, and is arranged near one end of the anchor rod 1 away from the anchor head 10 in the length direction, and the grout stop grouting pipe 4 is connected to the grout stop bag 3 for injecting slurry into the grout stop bag 3 so that the injected slurry squeezes the hole wall of the anchor rod to play a grout stop role.

[0024] The system bolt device for radial grouting provided by the embodiment of the present application installs a special grout stopping device on the bolt 1. The grout stopping device includes a grout stopping bag 3 and a grout stopping grouting pipe 4. The grout stopping bag 3 wraps around the periphery of the bolt 1 and the bolt grouting pipe 2, and is arranged near one end of the bolt 1 along the length direction away from the anchor head 10. The grout stopping grouting pipe 4 is connected to the grout stopping bag 3 and is used to inject grout into the grout stopping bag 3. With such a setting, during the construction of the system bolt, the bolt 1 equipped with the grout stopping device and the bolt grouting pipe 2 can be placed into the bolt hole. The grout stopping bag 3 is grouted through the grout stopping grouting pipe 4, and the injected grout is used to squeeze the bolt hole wall to achieve the grout stopping effect. Thus, when the bolt hole is grouted through the bolt grouting pipe 2 subsequently, the grout stopping device can well prevent the seepage of the grout. In this way, when the bolt hole is grouted through the bolt grouting pipe 2 subsequently, the grouting pressure can be increased, so that the grout can better penetrate into the loosened zone generated during the drilling of the bolt hole, and at the same time, the grout can better penetrate into the surrounding rock fissures, thereby greatly enhancing the support strength of the bolt 1; at the same time, through the higher grouting pressure, both the coupling effect between the bolt 1 and the bolt hole wall is ensured, and the surrounding rock is reinforced, so that the pulling force of the bolt 1 is greatly improved, thus playing a good role in supporting the rock formation.

[0025] In addition, the system bolt device for radial grouting provided by the embodiment of the present application installs a special grout stopping device on the bolt 1, which increases the adaptability of the grouting slurry to the bolt grouting. In specific implementation, the better compaction and penetration of the slurry with the surrounding rock can be ensured by increasing the grouting pressure in combination with a low water-cement ratio, or the seepage of the slurry can be effectively avoided by combining the grout stopping device with a higher water-cement ratio slurry while ensuring the better compaction and penetration of the slurry with the surrounding rock; in addition, the process of this construction method is relatively simple, and the special grout stopping device can be produced by the factory on behalf, so that the construction efficiency can be improved.

[0026] It should be noted that the grouting pressure of the existing system bolt is generally about 1 MPa, or lower than 1 MPa. The system bolt device for radial grouting provided by the embodiment of the present application installs a special grout stopping device on the bolt 1, and the grouting pressure of the system bolt device can be increased to 2 MPa, or higher than 2 MPa. In this way, while avoiding the seepage of the grout, a good compaction and penetration effect of the grout and the surrounding rock can be ensured, thus playing a good supporting effect on the rock formation.

[0027] In some embodiments, referring to Figure 1 、 Figure 3 and Figure 5As shown, the systematic bolt device further includes a backing plate 6 and a bolt nut 7; external threads are provided on a part of the outer peripheral surface of the bolt 1, and the external threads are arranged adjacent to one end of the bolt 1 that is far from the anchor head 10 along the length direction. The backing plate 6 and the bolt nut 7 are successively sleeved on the bolt 1 through the end of the bolt 1 that is far from the anchor head 10 along the length direction, and the bolt nut 7 is threadedly connected to the external threads to fix the bolt 1 and the backing plate 6. With such a setting, when the bolt 1 is placed into the pre-drilled bolt hole, the bolt 1 and the backing plate 6 can be fixed through the backing plate 6 and the bolt nut 7, playing a role in stabilizing the surrounding rock.

[0028] Continue to refer to Figure 1 、 Figure 3 and Figure 5 As shown, the backing plate 6 is provided with mounting holes for fasteners to pass through, so as to fix the backing plate 6 to the concrete closed surface set on the ground through the fasteners, thereby realizing the combination of the bolt 1 and the concrete closed surface, playing a role in fixing and stabilizing the bolt 1, and further using the systematic bolt device to better stabilize the surrounding rock.

[0029] It should be noted that before the systematic bolt device is placed into the pre-drilled bolt hole, the ground where the bolt hole is drilled can be concreted to form a concrete closed surface at the orifice of the bolt hole. After the systematic bolt device is placed into the pre-drilled bolt hole, the bolt 1 and the backing plate 6 can be fixed by sleeving the backing plate 6 and the bolt nut 7 on the bolt 1; then the backing plate 6 is fixed to the concrete closed surface set on the ground by using fasteners such as fastening bolts 8, thereby realizing the combination of the systematic bolt device and the concrete closed surface, playing a role in stabilizing the surrounding rock.

[0030] In a specific implementation, the bolt 1 can be a solid steel column with external threads, and the external threads on the bolt 1 are arranged adjacent to one end of the bolt 1 that is far from the anchor head 10 along the length direction; the backing plate 6 can be a square perforated steel plate, and a mounting through hole for the bolt 1 to pass through is provided at the center of the backing plate 6. The backing plate 6 is sleeved on the external threads of the bolt 1 through the mounting through hole at its center, and then the bolt nut 7 is screwed on the end of the bolt 1 where the backing plate 6 is sleeved to fix the bolt 1 and the backing plate 6. Further, four mounting holes are evenly distributed at the four corners of the backing plate 6, the fastener can be a fastening bolt 8, and mounting holes corresponding to the mounting holes on the backing plate 6 can be drilled on the concrete closed surface. The backing plate 6 is combined with the concrete closed surface by passing the fastening bolt 8 through the mounting holes on the backing plate 6 and the corresponding mounting holes on the concrete closed surface, playing a fixing role.

[0031] In some embodiments, refer to Figure 1 、 Figure 3 and Figure 5As shown, a first through-hole 61 for the anchor grouting pipe 2 to pass through and a second through-hole 62 for the grout-stop grouting pipe 4 to pass through are provided on the backing plate 6, so that the grouting nozzle of the anchor grouting pipe 2 can extend out through the first through-hole 61 on the backing plate 6, and the grouting nozzle of the grout-stop grouting pipe 4 can extend out through the second through-hole 62 on the backing plate 6, thereby achieving the purpose of grouting into the anchor hole through the grouting nozzle of the anchor grouting pipe 2 and the purpose of grouting into the grout-stop bag 3 of the grout-stop device through the grouting nozzle of the grout-stop grouting pipe 4.

[0032] In a specific implementation, an installation through-hole for the anchor 1 to pass through is provided at the central part of the backing plate 6. The first through-hole 61 and the second through-hole 62 can be respectively located on both sides of the installation through-hole. Among them, the diameter of the first through-hole 61 can be larger than that of the second through-hole 62. The first through-hole 61 is for the anchor grouting pipe 2 to pass through, and the second through-hole 62 is for the grout-stop grouting pipe 4 to pass through.

[0033] In some embodiments, referring to Figure 1 , Figure 2 and Figure 5 as shown, the grout-stop bag 3 is a membrane bag woven from fiber cloth. The grout-stop bag 3 has a receiving cavity arranged around the anchor 1. Both ends of the grout-stop bag 3 along the length direction of the anchor 1 are sealed. The grout-stop grouting pipe 4 is connected to one end of the grout-stop bag 3 relatively far from the anchor head 10 and communicates with the receiving cavity to inject slurry into the receiving cavity. With such a setting, when slurry is injected into the grout-stop bag 3 through the grout-stop grouting pipe 4, the injected slurry will inflate the grout-stop bag 3, so that the grout-stop bag 3 filled with slurry presses against the side wall of the anchor hole, thereby forming a good compaction effect between the grout-stop bag 3 and the anchor hole wall, thus achieving a good grout-stop effect and preventing the slurry injected when grouting into the anchor hole through the anchor grouting pipe 2 from seeping out from the grout-stop device.

[0034] In a specific implementation, referring to Figure 1 , Figure 2 and Figure 5 as shown, the grout-stop grouting pipe 4 can be connected to the grout-stop bag 3 through a grout-stop connector 5. Specifically, an installation port can be provided at one end of the grout-stop bag 3 relatively far from the anchor head 10. The installation port communicates with the receiving cavity of the grout-stop bag 3. The grout-stop connector 5 can be an annular connector fixed at the installation port. External threads can be provided on the grout-stop connector 5. Internal threads can be provided at one end of the grout-stop grouting pipe 4 for connecting to the grout-stop bag 3. Through the cooperation of the internal threads and the external threads, the grout-stop grouting pipe 4 can be screwed and fixed on the grout-stop connector 5, and the grout-stop grouting pipe 4 can be communicated with the receiving cavity formed in the grout-stop bag 3. Of course, for the specific connection structure between the grout-stop grouting pipe 4 and the grout-stop bag 3, it is not limited to the above definition, and other methods can also be used to realize the connection between the grout-stop grouting pipe 4 and the grout-stop bag 3.

[0035] It should be noted that the slurry injected into the grout bag 3 through the grout injection pipe 4 can adopt a low water-cement ratio with a water-cement ratio less than or equal to 0.75, and an external coagulant aid can be added to the slurry to accelerate the coagulation speed of the slurry, thereby improving the construction efficiency.

[0036] In some embodiments, referring to Figure 1 、 Figure 2 and Figure 5 as shown, the length of the grout bag 3 along the length direction of the anchor rod 1 is greater than 0.5 meters. Such a setting is to ensure that the grout bag 3 has sufficient length, so as to be closely fitted with the anchor hole wall to achieve a good grout stopping effect. In specific implementation, the length of the grout bag 3 can be reasonably set according to the actual situation, such as set to 0.6 meters, 0.8 meters, 1.0 meters, etc.

[0037] In some embodiments, referring to Figure 1 、 Figure 2 and Figure 5 as shown, both ends of the grout bag 3 along the length direction of the anchor rod 1 are provided with grout injection pipe holes 31, the anchor rod grout injection pipe 2 is passed through the grout injection pipe holes 31, and one end of the anchor rod grout injection pipe 2 along the length direction passes through the grout injection pipe holes 31 and extends towards the direction close to the anchor head 10. Such a setting is to ensure the normal installation of the anchor rod grout injection pipe 2.

[0038] Among them, one end of the anchor rod grout injection pipe 2 extending towards the direction close to the anchor head 10 extends to the area between the grout bag 3 and the anchor head 10, that is, one end of the anchor rod grout injection pipe 2 extending towards the direction close to the anchor head 10 extends to a position beyond the grout bag 3 but not beyond the anchor head 10. Specifically, the distance between one end of the anchor rod grout injection pipe 2 close to the anchor head 10 and the anchor head 10 is greater than 1 meter, and the distance that one end of the anchor rod grout injection pipe 2 close to the anchor head 10 extends beyond the grout bag 3 is greater than 0.5 meter. Such a setting ensures that when the systematic anchor rod device is placed in the anchor hole, there is a certain distance between the end of the anchor rod grout injection pipe 2 extending into the anchor hole and the bottom of the anchor hole, preventing the length of the anchor rod grout injection pipe 2 from being too long and extending into the surrounding rock at the bottom of the anchor hole, which affects the grouting effect; and, ensuring that the end of the anchor rod grout injection pipe 2 extending into the anchor hole extends beyond the grout bag 3 by a certain distance, so as to ensure that the anchor rod grout injection pipe 2 has a certain insertion depth in the anchor hole, thereby ensuring the grouting effect of injecting the anchor hole through the anchor rod grout injection pipe 2.

[0039] It should be noted that the slurry injected into the anchor hole through the anchor rod grout injection pipe 2 can adopt a low water-cement ratio with a water-cement ratio less than or equal to 0.75, and an external coagulant aid can be added to the slurry to accelerate the coagulation speed of the slurry, thereby improving the grouting construction efficiency.

[0040] In some embodiments, referring to Figure 1 and Figure 5As shown, the systematic anchor device further includes a steel pipe 9, which is sleeved on a partial rod section of the anchor rod 1. The setting position of the grout stop bag 3 on the anchor rod 1 corresponds to that of the steel pipe 9, and the grout stop bag 3 is wrapped around the periphery of the steel pipe 9. That is to say, the steel pipe 9 is sleeved in advance at the position where the grout stop bag 3 is sleeved on the anchor rod 1, so as to enhance the structural strength of the anchor rod 1 at the position where the grout stop bag 3 is sleeved by using the steel pipe 9. Thus, after the grout stop bag 3 is filled with grout, a good squeezing grout stopping effect is formed between the inner side of the grout stop bag 3 and the steel pipe 9, and a good squeezing grout stopping effect is formed between the outer side of the grout stop bag 3 and the anchor hole wall.

[0041] In some embodiments, referring to Figure 1 、 Figure 4 and Figure 5 As shown, on the outer peripheral surface of the anchor head 10, there are anchor head slopes 101 arranged oppositely along the radial direction of the anchor head 10, and the anchor head slopes 101 can help the anchor rod 1 to be better placed into a pre-drilled anchor hole.

[0042] In some embodiments, referring to Figure 1 、 Figure 4 and Figure 5 As shown, on the outer peripheral surface of the anchor head 10, there are anchor head annular threads 102, so as to increase the friction force of the outer peripheral surface of the anchor head 10 by using the anchor head annular threads 102, enhance the fixing strength of the anchor head 10 and the rock mass at the bottom of the anchor hole, and prevent the anchor head 10 from loosening from the rock mass.

[0043] Referring to Figure 6 As shown, some other embodiments of the present application provide a systematic anchor method for radial grouting. Using the systematic anchor device for radial grouting in any of the above embodiments, the method includes the following steps: S1, drilling an anchor hole with a preset angle in the rock mass; S2, installing a grout stopping device and an anchor rod grouting pipe 2 on the anchor rod 1 and then placing them into the anchor hole; S3, grouting the grout stop bag 3 of the grout stopping device through the grout stop and grouting pipe 4 of the grout stopping device; S4, after the grout in the grout stop bag 3 reaches a preset strength value, grouting the anchor hole through the anchor rod grouting pipe 2.

[0044] The system bolt method for radial grouting provided by the embodiments of the present application installs a special grout stopping device on the bolt 1. After the bolt 1 equipped with the grout stopping device and the bolt grouting holes is placed into the bolt hole, the grout bag 3 can be grouted through the grout stopping and grouting pipe 4. The injected grout is used to squeeze the bolt hole wall to play a grout stopping role. Thus, when the bolt hole is grouted through the bolt grouting pipe 2 subsequently, the grouting pressure can be increased, so that the grout can better penetrate into the loosened zone generated during the drilling of the bolt hole, and at the same time, the grout can better penetrate into the surrounding rock fissures, thereby greatly enhancing the support strength of the bolt 1. At the same time, through the higher grouting pressure, not only the coupling effect between the bolt 1 and the bolt hole wall is ensured, but also the surrounding rock is reinforced, so that the pulling force of the bolt 1 is greatly improved, thus playing a good role in supporting the rock formation.

[0045] In some embodiments, in S1, when drilling bolt holes with a preset angle in the rock mass, in order to ensure the hole forming quality and the requirements of a specific radial angle, it is necessary to use a bolt 1 machine or a three-arm drill as much as possible, and it is strictly prohibited to use a blower to drill bolt holes.

[0046] In some embodiments, in S2, the length of the grout bag 3 wrapped around the bolt 1 and the bolt grouting pipe 2 along the length direction of the bolt 1 is greater than 0.5 meters to ensure that the grout bag 3 has sufficient length, so as to be closely fitted with the bolt hole wall to achieve a good grout stopping effect. After the bolt 1 equipped with the grout stopping device and the bolt grouting pipe 2 is placed into the bolt hole, the distance from the end of the bolt grouting pipe 2 extending into the bolt hole to the bottom of the bolt hole is greater than 1 meter, and the distance from the end of the bolt grouting pipe 2 extending into the bolt hole exceeding the grout bag 3 is greater than 0.5 meters to ensure the grouting effect of grouting the bolt hole through the bolt grouting pipe 2.

[0047] In some embodiments, in S3, the grout used to grout the grout bag 3 through the grout stopping and grouting pipe 4 adopts a low water-cement ratio with a water-cement ratio less than or equal to 0.75, and an external coagulant is added to the grout to accelerate the setting speed. Such a setting can make the grout reach the purpose of rapid setting, thereby improving the grouting construction efficiency.

[0048] In some embodiments, in S4, the grout used to grout the bolt hole through the bolt grouting pipe 2 adopts a low water-cement ratio with a water-cement ratio less than or equal to 0.75, and the grouting pressure is greater than or equal to 2 MPa and less than or equal to 7.5 MPa. Such a setting is to adopt a larger grouting pressure, so that the low water-cement ratio grout can well compact and penetrate the loosened zone that appears due to impact vibration during the drilling of the bolt hole, thereby improving the fixing strength of the bolt 1, enhancing the pulling force of the bolt 1, and thus playing a good supporting effect on the rock formation. And the low water-cement ratio grout has poor fluidity and good setting property, so that it can reach rapid setting and improve the grouting construction efficiency. To improve the setting speed of the grout, an external coagulant can be added to the grout to accelerate the setting speed of the grout.

[0049] In specific implementation, when grouting the anchor hole through the anchor grouting pipe 2, a specially made medium-pressure screw pump can be used as the grouting pump, and the grouting pressure can be reasonably set and adjusted according to the actual situation. Exemplarily, the grouting pressure can specifically be 2 MPa, 2.5 MPa, 3 MPa, 3.5 MPa, 4 MPa, 6 MPa, 7.5 MPa, etc. During the grouting process, the seepage situation of the grout can be observed in real time. If there is grout seepage, the grouting pressure can be appropriately reduced.

[0050] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

[0051] The above are only specific implementation manners of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments described herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A system bolt device for radial grouting, characterized in that, include: An anchor rod, wherein one end of the anchor rod along the length direction is provided with an anchor head; An anchor rod grouting pipe, the anchor rod grouting pipe is located outside the anchor rod and extends along the length direction of the anchor rod; A grouting-stopping device includes a grouting-stopping bag and a grouting-stopping grouting pipe. The grouting-stopping bag is wrapped around the outer periphery of the anchor rod and the anchor rod grouting pipe, and is arranged near one end of the anchor rod away from the anchor head along the length direction. The grouting-stopping grouting pipe is connected to the grouting-stopping bag and is used to inject slurry into the grouting-stopping bag so that the injected slurry squeezes the anchor rod hole wall to play a grouting-stopping role.

2. The system anchor device for radial grouting according to claim 1, characterized in that, The system anchor device also includes a backing plate and an anchor nut; An external thread is provided on part of the outer circumference of the anchor rod, and the external thread is arranged adjacent to the end of the anchor rod away from the anchor head along the length direction. The pad and the anchor nut are sequentially sleeved on the anchor rod through the end of the anchor rod away from the anchor head along the length direction, and the anchor nut is threadedly connected to the external thread to fix the anchor rod and the pad.

3. The system bolt device for radial grouting according to claim 2, characterized in that, The base plate is provided with mounting holes for fastening bolts to pass through, so as to fix the base plate to the concrete sealing surface set on the ground surface through the fastening bolts; And / or, the base plate is provided with a first through hole for the anchor rod grouting pipe to pass through, and a second through hole for the stop grouting pipe to pass through.

4. The system anchor device for radial grouting according to claim 1, characterized in that, The grouting bag is a film bag woven from fiber cloth. The grouting bag has a accommodating cavity arranged around the anchor rod. The grouting bag is sealed at both ends along the length direction of the anchor rod. The grouting grouting pipe is connected to the end of the grouting bag relatively far away from the anchor head and is connected to the accommodating cavity to inject slurry into the accommodating cavity.

5. The system anchor device for radial grouting according to claim 1, characterized in that, The length of the grouting bag along the length direction of the anchor rod is greater than 0.5 meters.

6. The system anchor rod device for radial grouting according to claim 1, characterized in that, The grouting bag is provided with grouting pipe holes at both ends along the length direction of the anchor rod, the anchor rod grouting pipe is passed through the grouting pipe holes, and one end of the anchor rod grouting pipe along the length direction passes through the grouting pipe hole and extends toward the direction close to the anchor head; Wherein, the distance between the end of the anchor rod grouting pipe close to the anchor head and the anchor head is greater than 1 meter, and the distance between the end of the anchor rod grouting pipe close to the anchor head and the grouting bag is greater than 0.5 meter.

7. The system bolt device for radial grouting according to claim 1, wherein, The system anchor device also includes a steel pipe, which is sleeved on a portion of the anchor rod section. The grouting bag is arranged at a position on the anchor rod corresponding to the steel pipe, and the grouting bag is wrapped around the outer periphery of the steel pipe.

8. The system anchor device for radial grouting according to claim 1, characterized in that, The outer circumferential surface of the anchor head is provided with anchor head slopes arranged opposite to each other along the radial direction of the anchor head; and / or the outer circumferential surface of the anchor head is provided with anchor head ring patterns, so as to increase the friction force of the outer circumferential surface of the anchor head by using the anchor head ring patterns.

9. A system anchor method for radial grouting, characterized in that, Using the system anchor device for radial grouting according to any one of claims 1 to 8, the method comprises the following steps: S1, drilling anchor holes with preset angles in the rock mass; S2, installing a grouting stop device and an anchor grouting pipe on the anchor and then placing them into the anchor hole; S3, grouting the grouting bag of the grouting device through the grouting grouting pipe of the grouting device; In S4, after the slurry in the grout bag reaches the preset strength value, grout the anchor hole through the anchor grouting pipe.

10. The system bolt method for radial grouting according to claim 9, characterized in that, In S2, the length of the grout bag along the length direction of the anchor is greater than 0.5 m, the distance from the end of the anchor grouting pipe extending into the anchor hole to the bottom of the anchor hole is greater than 1 m, and the distance that the end of the anchor grouting pipe extending into the anchor hole exceeds the grout bag is greater than 0.5 m; And / or, in S3, the slurry used to grout the grout bag through the grout injection pipe has a low water-cement ratio less than or equal to 0.75, and an external coagulant is added to the slurry to accelerate the setting speed; And / or, in S4, the slurry used to grout the anchor hole through the anchor grouting pipe has a low water-cement ratio less than or equal to 0.75, and the grouting pressure is greater than or equal to 2 MPa and less than or equal to 7.5 MPa.

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