CN117905502A - Internal expansion grouting anchor rod for supporting surrounding rock of roadway and supporting method thereof - Google Patents
Internal expansion grouting anchor rod for supporting surrounding rock of roadway and supporting method thereof Download PDFInfo
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- CN117905502A CN117905502A CN202410058358.3A CN202410058358A CN117905502A CN 117905502 A CN117905502 A CN 117905502A CN 202410058358 A CN202410058358 A CN 202410058358A CN 117905502 A CN117905502 A CN 117905502A
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- Prior art keywords
- grouting
- anchor rod
- anchor
- head
- rod
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- 239000011435 rock Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000011440 grout Substances 0.000 claims description 18
- 230000001681 protective effect Effects 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 7
- 239000004519 grease Substances 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 12
- 238000004873 anchoring Methods 0.000 abstract description 8
- 239000007788 liquid Substances 0.000 description 9
- 239000004570 mortar (masonry) Substances 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/028—Devices or accesories for injecting a grouting liquid in a bore-hole
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/008—Anchoring or tensioning means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0093—Accessories
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/02—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection having means for indicating tension
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to the technical field of roadway support, in particular to an internal expansion grouting anchor rod for supporting surrounding rock of a roadway and a supporting method thereof. Comprising the following steps: the device comprises a rod body, an anchor rod head, a fixing structure, a grouting structure, an exhaust pipe and a sensor structure, wherein threaded connectors are arranged at two ends of the rod body; the anchor rod head is fixedly connected with a threaded joint at the end part of the rod body; the fixing structure is sleeved on the anchor rod head, and the end part of the fixing structure is connected with a threaded joint close to the end part of the rod body of the anchor rod head; the grouting structure is sleeved on the threaded joint of the end part of the rod body, which is far away from the anchor rod head; the exhaust pipe is arranged between the anchor rod head and the grouting structure, the exhaust pipe and the rod body are arranged in parallel, and one end of the exhaust pipe, which is far away from the anchor rod head, is fixedly connected with the grouting structure; the sensor structure is fixedly arranged on the rod body. The invention can improve the anchoring effect of the anchor rod, more accurately control grouting effect and monitor the condition of the rod body in real time.
Description
Technical Field
The invention relates to the technical field of roadway support, in particular to an internal expansion grouting anchor rod for supporting surrounding rock of a roadway and a supporting method thereof.
Background
Although the traditional mortar anchor rod has very simple structure, low cost and convenient construction, the surrounding rock structure is greatly improved, but the traditional mortar anchor rod has a plurality of problems. In construction, the grouting plumpness of a common mortar anchor rod is influenced by human factors, and grouting unsaturation phenomenon is caused between mortar and surrounding rock due to poor tightness of grouting stopping measures. These causes lead to a reduced contact area between the mortar and the surrounding rock, accelerated corrosion of the rod piece and reduced friction between the mortar and the surrounding rock, so that the pulling resistance of the anchor rod is not ensured. While the grouting effect of the hollow grouting anchor rod can be effectively improved in the grouting construction process, the bending strength and the tensile strength of the anchor rod can be reduced due to the fact that grouting from the inner holes is prone to the problems of leakage, blockage and the like, grouting difficulty is high, and the anchoring effect is affected. In addition, the mortar anchor rod is inserted into the grout in the installation process, so that the suspension effect of the anchor rod cannot be effectively controlled, the prestress effect is poor, and safety accidents are easy to occur, and therefore, a device and a method for improving the anchoring effect of the anchor rod and accurately controlling the grouting effect are urgently needed.
Disclosure of Invention
The invention aims to provide an internal expansion grouting anchor rod for supporting surrounding rock of a roadway and a supporting method thereof, so as to solve the problems. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
In one aspect, the application provides an internal expanding grouting anchor for roadway surrounding rock support, comprising: the grouting device comprises a rod body, an anchor rod head, a fixing structure, a grouting structure, an exhaust pipe and a sensor structure, wherein threaded connectors are arranged at two ends of the rod body; the anchor rod head is fixedly connected with a threaded joint at the end part of the rod body; the fixing structure is sleeved on the anchor rod head, and the end part of the fixing structure is connected with a threaded joint close to the end part of the rod body of the anchor rod head; the grouting structure is sleeved on a threaded joint at the end part of the rod body, which is far away from the anchor rod head; the exhaust pipe is arranged between the anchor rod head and the grouting structure, the exhaust pipe and the rod body are arranged in parallel, and one end of the exhaust pipe, which is far away from the anchor rod head, is fixedly connected with the grouting structure; the sensor structure is fixedly arranged on the rod body.
Optionally, the fixed knot constructs including inflation head, protective sheath and top card, inflation headgear is in on the stock head, the protective sheath cover is established on the inflation head, top card sets up the protective sheath with between the stock head.
Optionally, the sensor structure includes pressure sensor, stress-strain sensor and microseism detector, pressure sensor is fixed to be set up in the body of rod is close to the tip of anchor pole head, stress-strain sensor and microseism detector are all fixed to be set up on the lateral wall of the body of rod.
Optionally, a stop pad is further sleeved on the threaded joint of the rod body, which is close to the anchor rod head, and the stop pad is arranged between the expansion head and the rod body.
Optionally, grease is arranged between the protective sleeve and the top card.
Optionally, the fixed knot constructs including stopping thick liquid stopper, stock tray, nut and rubber seal layer, the nut stock tray with stopping thick liquid stopper cover is established on the screwed joint of body of rod tip, the stock tray sets up the nut with between the body of rod, stopping thick liquid stopper sets up the stock tray with between the body of rod, the rubber seal layer cover is established stopping on the lateral wall of thick liquid stopper.
Optionally, the grouting plug is internally provided with a grouting hole, a connecting piece and an exhaust hole, and the exhaust hole is connected with the exhaust pipe through the connecting piece.
Optionally, the expansion free end of the expansion head is a triangular cone clamp body uniformly arranged along the circumferential direction of the expansion head, and an expansion gap is arranged between adjacent triangular cone clamp bodies.
Optionally, the top card includes annular cover and top card body, and the fixed setting of annular cover is in the top of anchor pole head, the one end of top card body with the annular cover links to each other, the other end of top card body with the inside wall laminating setting of expansion head.
In another aspect, the application provides a method of supporting an inner expansion grouting anchor for roadway surrounding rock support, comprising;
Assembling the anchor rod head, the fixing structure, the screw cap, the anchor rod tray, the grout stop plug, the exhaust pipe and the sensor structure on the rod body to obtain an assembled inner expansion grouting anchor rod;
The inner expansion grouting anchor rod is upwards inserted into an anchor hole of surrounding rock to be supported, prestress is applied along the bottom of the anchor hole, and an inner fixing structure of the inner expansion grouting anchor rod is clamped on the side wall of the anchor hole;
rotating the internal expansion grouting anchor rod, and uniformly expanding the fixing structure again to anchor the anchor rod in the anchor hole to obtain a fixed internal expansion grouting anchor rod;
Grouting the anchor hole through the grouting hole of the grouting plug, and acquiring sensor information sent by a sensor structure on an internal expansion grouting anchor rod and grouting overflow data in the exhaust pipe in real time;
Judging whether a preset condition is reached or not based on sensor information and grouting overflow data in the exhaust pipe, if the judgment result is that the preset condition is reached, controlling grouting equipment to stop grouting, and fixing a grouting stop plug to obtain a support structure of the internal expansion grouting anchor rod, wherein the preset condition is that data transmitted by the sensor structure is larger than a preset threshold value or grouting overflow data in the exhaust pipe.
The beneficial effects of the invention are as follows:
According to the invention, the expansion heads are uniformly expanded along the radial direction and clamped on the inner wall of the anchor hole, so that the anchoring force between the anchor heads and surrounding rock is improved, the pulling resistance of the anchor rod is improved, and the phenomenon that the anchor rod is damaged due to insufficient pulling resistance is eliminated; meanwhile, the grout stop plug is subjected to prestress at two ends, so that the prestress is released along the radial direction and is tightly attached to the anchor hole, and the anchoring effect of the anchor rod is improved; because the grouting liquid is injected into the anchor hole which is obliquely arranged upwards by the anchor rod, the grouting liquid can move downwards due to the action of gravity, so that the pressure of the anchor hole opening is maximum, and the pressure of the anchor hole bottom is minimum; the invention can also monitor the stress strain of the rod body in real time through the stress strain sensor, monitor the vibration condition of the rod body in real time through the microseismic detector, and early warn the instability risk of the expanding grouting anchor rod support in the roadway surrounding rock support.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the embodiments of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an axial cross-sectional schematic view of an inner expanding grouting anchor for roadway surrounding rock support according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view at A-A of FIG. 1;
FIG. 3 is a schematic cross-sectional view at B-B of FIG. 1;
FIG. 4 is a schematic diagram of a top card according to an embodiment of the present invention;
Fig. 5 is a schematic left view of an inner expansion grouting anchor for roadway surrounding rock support according to an embodiment of the present invention.
The marks in the figure: 1. a protective sleeve; 2. a top card; 3. an anchor head; 4. an expansion head; 5. a top card body; 6. a baffle pad; 7. a pressure sensor; 8. an exhaust pipe; 9. a triangular pyramid clip body; 10. a rod body; 11. a connecting piece; 12. a grout stop plug; 13. an exhaust hole; 14. an anchor rod tray; 15. a screw cap; 16. an annular sleeve; 17. grouting holes; 18. a microseismic detector; 19. a stress-strain sensor; 20. grease; 21. and a rubber sealing layer.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
Example 1
As shown in fig. 1, 2, 3 and 4, the present embodiment provides an internal expansion grouting anchor for roadway surrounding rock support, including: the device comprises a rod body 10, an anchor rod head 3, a fixing structure, a grouting structure, an exhaust pipe 8 and a sensor structure, wherein threaded joints are arranged at two ends of the rod body 10; the anchor rod head 3 is fixedly connected with a screwed joint at the end part of the rod body 10; the fixing structure is sleeved on the anchor rod head 3, and the end part of the fixing structure is connected with a threaded joint close to the end part of the rod body 10 of the anchor rod head 3; the grouting structure is sleeved on a threaded joint of the end part of the rod body 10, which is far away from the anchor rod head 3; the exhaust pipe 8 is arranged between the anchor rod head 3 and the grouting structure, the exhaust pipe 8 and the rod body 10 are arranged in parallel, and one end of the exhaust pipe 8, which is far away from the anchor rod head 3, is fixedly connected with the grouting structure; and the sensor structure is fixedly arranged on the rod body 10.
According to the invention, the expansion heads are uniformly expanded along the radial direction and clamped on the inner wall of the anchor hole, so that the anchoring force between the anchor heads and surrounding rock is improved, the pulling resistance of the anchor rod is improved, and the phenomenon that the anchor rod is damaged due to insufficient pulling resistance is eliminated; meanwhile, the grout stop plug is subjected to prestress at two ends, so that the prestress is released along the radial direction and is tightly attached to the anchor hole, and the anchoring effect of the anchor rod is improved; because the grouting liquid is injected into the anchor hole which is obliquely arranged upwards by the anchor rod, the grouting liquid can move downwards due to the action of gravity, so that the pressure of the anchor hole opening is maximum, and the pressure of the anchor hole bottom is minimum; the invention can also monitor the stress strain of the rod body in real time through the stress strain sensor, monitor the vibration condition of the rod body in real time through the microseismic detector, and early warn the instability risk of the expanding grouting anchor rod support in the roadway surrounding rock support.
The fixing structure comprises an expansion head 4, a protective sleeve 1 and a top clamp 2, wherein the expansion head 4 is sleeved on the anchor rod head 3, the protective sleeve 1 is sleeved on the expansion head 4, and the top clamp 2 is arranged between the protective sleeve 1 and the anchor rod head 3.
According to the invention, the fixing structure is arranged on the anchor rod head 3, so that the expansion head 4 is protected, and the top clamp 2 is opened when the expansion head 4 expands, so that the expansion free end of the expansion head is primarily expanded and clamped on the side wall of an anchor hole, wherein the protective sleeve 1 can be made of anti-skid soft rubber, so that the anchor rod head 3 which cannot be injected with slurry is protected, and corrosion caused by water and salt is avoided; meanwhile, the protective sleeve 1 can increase the friction force of the expansion head 4 in contact with surrounding rock so as to improve the anti-slip capability, and can also play a role in reducing the vibration influence of blasting on the rod body 10.
The sensor structure comprises a pressure sensor 7, a stress-strain sensor 19 and a microseismic detector 18, wherein the pressure sensor 7 is fixedly arranged at the end part of the rod body 10, which is close to the anchor rod head 3, and the stress-strain sensor 19 and the microseismic detector 18 are fixedly arranged on the outer side wall of the rod body 10.
The stress-strain sensor 19 is used for monitoring the stress-strain of the rod body 10 in real time, and the microseismic detector 18 is used for monitoring the vibration condition of the rod body 10 in real time; the micro-vibration detector 18, the rod body 10 and the surrounding rock are integrated after grouting, and the vibration condition of the rod body 10 can be monitored in real time through the micro-vibration detector 18, so that the vibration condition of the surrounding rock, the vibration condition and the change trend of the roadway support structure can be monitored, and the stability of the roadway support structure can be judged; the method is favorable for timely finding out the damage and the defect of the roadway support structure and adopting corresponding maintenance and reinforcement measures. Therefore, the vibration condition of the rod body is monitored in real time, so that the design of the roadway support structure can be optimized: vibration characteristics and response rules of the roadway support structure under different conditions can be known by monitoring the microseismic signals, so that the design and construction scheme of the roadway support structure are optimized, the safety performance of the roadway support structure is improved, and the service life of the roadway support structure is prolonged; abnormal vibration and change of the roadway support structure can be found in time by monitoring the microseismic signals, so that the risk of instability of the roadway support structure is early warned; by monitoring the microseismic signals, the damage and the defect of the roadway support structure can be found in time, so that corresponding maintenance and reinforcement measures are taken, the shutdown and delay caused by serious faults and accidents of the roadway support structure are avoided, and the maintenance cost is reduced.
The rod body 10 is further sleeved with a blocking pad 6 close to the threaded joint of the anchor rod head 3, and the blocking pad 6 is arranged between the expansion head 4 and the rod body 10.
The invention increases the stability between the expansion head 4 and the rod body 10 by arranging the baffle pad 6, and prevents the gap between the expansion head 4 and the rod body 10.
Wherein grease 20 is arranged between the protective sleeve 1 and the top card 2.
The grease 20 is arranged to reduce friction between the protective sleeve and the anchor rod head and protect the expansion head from being corroded by water and salt.
The fixing structure comprises a grout stop plug 12, an anchor rod tray 14, a screw cap 15 and a rubber sealing layer 21, wherein the screw cap 15 is sleeved on a threaded joint of the end part of the rod body 10 by the screw cap 15, the anchor rod tray 14 is arranged between the screw cap 15 and the rod body 10, the grout stop plug 12 is arranged between the anchor rod tray 14 and the rod body 10, and the rubber sealing layer 21 is sleeved on the outer side wall of the grout stop plug 12.
The invention locks the grout stop plug 12 through the anchor rod tray 14 and the screw cap 15; the anchor rod tray 14 and the screw cap 15 press the grout stop plug 12 upwards, and the anchor rod tray 14 and the screw cap 15 cooperate to simultaneously apply prestress to the grout stop plug 12 so as to prevent the grout stop plug 12 from sliding out of the rod body 10; the grouting stopper 12 is subjected to prestress at two ends, and then the prestress releases compressive stress along the radial direction to be attached and clamped with the anchor holes, so that the anchoring effect of the rod body 10 is improved, wherein the rubber sealing layer 21 is arranged on the side wall of the grouting stopper 12, the sealing effect of pores is guaranteed, and liquid is prevented from leaking during grouting.
The grouting plug 12 is internally provided with a grouting hole 17, a connecting piece 11 and an exhaust hole 13, and the exhaust hole 13 is connected with the exhaust pipe 8 through the connecting piece 11.
According to the invention, grouting is performed through the grouting holes 17, exhaust is performed through the exhaust holes 13 in the grouting process, and the exhaust holes 13 are connected with the exhaust pipe 8 through the connecting piece 11, so that the exhaust pipe 8 is prevented from falling off in the grouting process.
The expansion free end of the expansion head 4 is a triangular pyramid clamping body 9 uniformly arranged along the circumferential direction of the expansion head 4, and an expansion gap is arranged between adjacent triangular pyramid clamping bodies 9.
According to the invention, the anchor rod head 3 is contacted with the bottom surface of the anchor hole and extrudes the expansion head 4 by applying prestress along the bottom of the anchor hole, and the expansion free end of the expansion head 4 is initially expanded to extrude the triangular pyramid clamping body 9, so that the triangular pyramid clamping body 9 is clamped on the side wall of the anchor hole.
The top card 2 comprises an annular sleeve 16 and a top card body 5, the annular sleeve 16 is fixedly arranged at the top end of the anchor rod head 3, one end of the top card body 5 is connected with the annular sleeve 16, and the other end of the top card body 5 is attached to the inner side wall of the expansion head 4.
According to the invention, the rod body 10 is rotated, and the top clamping body 5 and the annular sleeve 16 push the expansion free end of the expansion head 4 to uniformly expand again, so that the anchor rod is anchored in the anchor hole.
Example 2
As shown in fig. 5, the present embodiment provides a supporting method of an internal expansion grouting anchor rod for supporting surrounding rock of a roadway, which includes steps S1, S2, S3, S4 and S5.
S1, assembling an anchor rod head 3, a fixing structure, a nut 15, an anchor rod tray 14, a grout stop plug 12, an exhaust pipe 8 and a sensor structure on a rod body 10 to obtain an assembled internal expansion grouting anchor rod;
S2, the internal expansion grouting anchor rod is upwards inserted into an anchor hole of surrounding rock to be supported, prestress is applied along the bottom of the anchor hole, and an internal fixing structure of the internal expansion grouting anchor rod is clamped on the side wall of the anchor hole;
S3, rotating the internal expansion type grouting anchor rod, uniformly expanding the fixing structure again to anchor the anchor rod in the anchor hole, and obtaining the fixed internal expansion type grouting anchor rod;
It can be understood that this step is to rotate the rod body 10, prop open the free end of the expansion head 4 by the top clip at the top end of the fixing structure, and the free end of the expansion head 4 is clipped in the anchor hole, so as to fix the inner expansion anchor rod.
Step S4, grouting is carried out on the anchor hole through a grouting hole 17 of the grouting plug 12, and sensor information sent by a sensor structure on an internal expansion grouting anchor rod and grouting overflow data in the exhaust pipe 8 are obtained in real time;
It will be appreciated that in this step the grouting overflow data in the exhaust pipe 8 is collected by a sensor arrangement wherein the pressure sensor 7 is arranged at the mouth of the exhaust pipe 8 and is capable of sensing when grouting overflows.
And S5, judging whether a preset condition is met or not based on the sensor information and grouting overflow data in the exhaust pipe 8, if the judgment result is that the preset condition is met, controlling grouting equipment to stop grouting, and fixing a grouting stop plug 12 to obtain a support structure of the internal expansion grouting anchor rod, wherein the preset condition is that data transmitted by the sensor structure is larger than a preset threshold value or grouting overflow data in the exhaust pipe 8.
It can be understood that the stress strain of the rod body is monitored in real time through the stress strain sensor 19, the vibration condition of the rod body is monitored in real time through the microseismic detector 18, the deformation of the surrounding rock after the support is monitored and early warned through the deformation and the vibration condition of the rod body, and the instability risk of the support is reduced.
It can be understood that the preset condition in this step is to determine whether the data in the pressure sensor reaches the preset pressure, where the calculation formula of the preset pressure is as follows:
P0＝0.5L*sinθ*(πR2ρg)+6πηrv
Wherein, P 0 is the preset pressure, L is the length of the grouting section, θ is the included angle between the rod body and the gravity direction, R is the effective diffusion radius of the slurry, g is the gravity acceleration, η is the viscosity of the fluid, ρ is the density of the slurry, R is the average radius of slurry particles, v is the speed of the slurry in the fluid, and pi is the circumference ratio.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. An interior expanding grouting anchor for roadway surrounding rock support, which is characterized by comprising:
The device comprises a rod body (10), wherein threaded joints are arranged at two ends of the rod body (10);
The anchor rod head (3) is fixedly connected with a threaded joint at the end part of the rod body (10);
the fixing structure is sleeved on the anchor rod head (3), and the end part of the fixing structure is connected with a threaded joint close to the end part of the rod body (10) of the anchor rod head (3);
the grouting structure is sleeved on a threaded joint at the end part of the rod body (10) far away from the anchor rod head (3);
The exhaust pipe (8) is arranged between the anchor rod head (3) and the grouting structure, the exhaust pipe (8) and the rod body (10) are arranged in parallel, and one end, far away from the anchor rod head (3), of the exhaust pipe (8) is fixedly connected with the grouting structure; and
And the sensor structure is fixedly arranged on the rod body (10).
2. An internal expanding grouting bolt for roadway surrounding rock support as claimed in claim 1, wherein: the fixing structure comprises an expansion head (4), a protective sleeve (1) and a top clamp (2), wherein the expansion head (4) is sleeved on the anchor rod head (3), the protective sleeve (1) is sleeved on the expansion head (4), and the top clamp (2) is arranged between the protective sleeve (1) and the anchor rod head (3).
3. An internal expanding grouting bolt for roadway surrounding rock support as claimed in claim 1, wherein: the sensor structure comprises a pressure sensor (7), a stress strain sensor (19) and a microseismic detector (18), wherein the pressure sensor (7) is fixedly arranged at the end part of the rod body (10) close to the anchor rod head (3), and the stress strain sensor (19) and the microseismic detector (18) are fixedly arranged on the outer side wall of the rod body (10).
4. An internal expanding grouting bolt for roadway surrounding rock support as claimed in claim 1, wherein: the rod body (10) is close to the threaded joint of the anchor rod head (3) and is further sleeved with a blocking pad (6), and the blocking pad (6) is arranged between the expansion head (4) and the rod body (10).
5. An inner expanding grouting bolt for roadway surrounding rock support as claimed in claim 2, wherein: grease (20) is arranged between the protective sleeve (1) and the top card (2).
6. An internal expanding grouting bolt for roadway surrounding rock support as claimed in claim 1, wherein: the fixing structure comprises a grout stopping plug (12), an anchor rod tray (14), a screw cap (15) and a rubber sealing layer (21), wherein the screw cap (15), the screw cap (15) is sleeved with the anchor rod tray (14) and the grout stopping plug (12) on a threaded joint at the end part of the rod body (10), the anchor rod tray (14) is arranged between the screw cap (15) and the rod body (10), the grout stopping plug (12) is arranged between the anchor rod tray (14) and the rod body (10), and the rubber sealing layer (21) is sleeved on the outer side wall of the grout stopping plug (12).
7. The inner expanding grouting bolt for roadway surrounding rock support of claim 6, wherein: grouting holes (17), connecting pieces (11) and exhaust holes (13) are formed in the grouting plug (12), and the exhaust holes (13) are connected with the exhaust pipe (8) through the connecting pieces (11).
8. An inner expanding grouting bolt for roadway surrounding rock support as claimed in claim 2, wherein: the expansion free end of the expansion head (4) is a triangular cone clamp body (9) which is uniformly arranged along the circumferential direction of the expansion head (4), and an expansion gap is formed between adjacent triangular cone clamp bodies (9).
9. An inner expanding grouting bolt for roadway surrounding rock support as claimed in claim 2, wherein: the top card (2) include annular cover (16) and top card body (5), and the fixed setting of annular cover (16) is in the top of stock head (3), the one end of top card body (5) with annular cover (16) links to each other, the other end of top card body (5) with the laminating of the inside wall of expansion head (4) sets up.
10. The method for supporting the inner expansion grouting anchor rod for supporting surrounding rock of the roadway is characterized by comprising the following steps of;
Assembling the anchor rod head (3), the fixing structure, the screw cap (15), the anchor rod tray (14), the grout stop plug (12), the exhaust pipe (8) and the sensor structure on the rod body (10) to obtain an assembled internal expansion grouting anchor rod;
The inner expansion grouting anchor rod is upwards inserted into an anchor hole of surrounding rock to be supported, prestress is applied along the bottom of the anchor hole, and an inner fixing structure of the inner expansion grouting anchor rod is clamped on the side wall of the anchor hole;
rotating the internal expansion grouting anchor rod, and uniformly expanding the fixing structure again to anchor the anchor rod in the anchor hole to obtain a fixed internal expansion grouting anchor rod;
grouting the anchor hole through a grouting hole (17) of the grouting plug (12), and acquiring sensor information sent by a sensor structure on an internal expansion grouting anchor rod and grouting overflow data in the exhaust pipe (8) in real time;
Judging whether a preset condition is reached or not based on sensor information and grouting overflow data in the exhaust pipe (8), if the judgment result is that the preset condition is reached, controlling grouting equipment to stop grouting, and fixing a grouting stop plug (12) to obtain a supporting structure of the internal expansion grouting anchor rod, wherein the preset condition is that data transmitted by the sensor structure is larger than a preset threshold value or grouting overflow data in the exhaust pipe (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410058358.3A CN117905502A (en) | 2024-01-16 | 2024-01-16 | Internal expansion grouting anchor rod for supporting surrounding rock of roadway and supporting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410058358.3A CN117905502A (en) | 2024-01-16 | 2024-01-16 | Internal expansion grouting anchor rod for supporting surrounding rock of roadway and supporting method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117905502A true CN117905502A (en) | 2024-04-19 |
Family
ID=90691644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410058358.3A Withdrawn CN117905502A (en) | 2024-01-16 | 2024-01-16 | Internal expansion grouting anchor rod for supporting surrounding rock of roadway and supporting method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117905502A (en) |
-
2024
- 2024-01-16 CN CN202410058358.3A patent/CN117905502A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20240419 |
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| WW01 | Invention patent application withdrawn after publication |