CN114658458A - Foot locking anchor rod system suitable for broken rock mass tunnel and use method - Google Patents
Foot locking anchor rod system suitable for broken rock mass tunnel and use method Download PDFInfo
- Publication number
- CN114658458A CN114658458A CN202210318693.3A CN202210318693A CN114658458A CN 114658458 A CN114658458 A CN 114658458A CN 202210318693 A CN202210318693 A CN 202210318693A CN 114658458 A CN114658458 A CN 114658458A
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- anchor rod
- anchoring
- foot
- rod
- anchoring agent
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000011435 rock Substances 0.000 title claims abstract description 21
- 238000004873 anchoring Methods 0.000 claims abstract description 150
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 106
- 239000011347 resin Substances 0.000 claims abstract description 25
- 229920005989 resin Polymers 0.000 claims abstract description 25
- 239000011440 grout Substances 0.000 claims abstract description 22
- 230000000694 effects Effects 0.000 claims abstract description 17
- 239000002985 plastic film Substances 0.000 claims abstract description 14
- 229920006255 plastic film Polymers 0.000 claims abstract description 14
- 238000001125 extrusion Methods 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 30
- 239000010959 steel Substances 0.000 claims description 30
- 238000005553 drilling Methods 0.000 claims description 26
- 238000010276 construction Methods 0.000 claims description 18
- 238000009434 installation Methods 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 8
- 239000004567 concrete Substances 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 238000005422 blasting Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 4
- 238000007569 slipcasting Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
-
- 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
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- 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)
- Architecture (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides a foot locking anchor rod system suitable for a broken rock mass tunnel and a using method. The system, comprising: the pin locking anchor rod with the hollow structure is characterized in that expandable resin anchoring agents are placed at two ends of the pin locking anchor rod and wrapped in plastic films, and the expandable resin anchoring agents are filled between the anchor rod and the hole wall through holes under the extrusion and expansion effects after the plastic films are crushed by the anchoring push rod. An end head anchoring agent is fixed in the hollow part of the front end part of the foot locking anchor rod, a grout stopping anchoring agent is fixed in the hollow part of the rear end part of the foot locking anchor rod, and the grout stopping anchoring agent generates volume expansion when the end head anchoring agent meets air. The expandable resin anchoring agent is arranged at the two ends of the hollow anchor rod and is wrapped in the plastic film, and after the plastic film is broken by the pushing rod, the expandable resin anchoring agent is filled between the anchor rod and the hole wall through the hole under the extrusion and expansion effects, so that the rapid anchoring effect is achieved.
Description
Technical Field
The invention relates to the technical field of construction of a foot locking anchor rod in a tunnel construction process, in particular to a foot locking anchor rod system suitable for a broken rock mass tunnel and a using method.
Background
The foot-locking anchor rod plays an important role in controlling the stability and deformation of the steel arch frame, but at present, the foot-locking anchor rod in the prior art is applied to the following problems:
firstly, the connection of the foot-locking anchor rod and the steel arch frame is realized by adopting L-shaped steel bars in a welding mode, the welding technology of workers is seriously depended, the requirement on the responsibility of the workers is high, and the problem of infirm welding is often caused.
Secondly, the anchoring effect of the foot locking anchor rod is poor, the construction efficiency is low, if the anchoring is carried out by adopting the drug roll type anchoring agent, the problem that the anchor rod cannot be inserted is easily caused when more anchoring agent is filled after drilling, and the anchoring effect is poor when less anchoring agent is filled; if adopt mortar anchor or slip casting anchor, because the process lock foot stock construction quantity of every turn is less, slip casting and grout process preparation and construction will seriously influence the efficiency of construction, and the slurry strength increases needs time in addition, is unfavorable for the lock foot stock in time to play a role, leads to often appearing concentrating the disposable slip casting phenomenon after the construction of many times lock foot stock in the actual work progress, seriously influences the performance of lock foot stock control steel bow member deformation effect.
Thirdly, the construction position and the construction angle of the foot-locking anchor rod are mainly controlled by constructors, and the design requirements are difficult to meet.
The above-mentioned problem is more outstanding in broken rock mass tunnel, mainly because broken rock mass pore wall poor stability, intensity is low, changes to lead to in cartridge anchoring agent and the stock can not insert the drilling after the drilling, and broken rock mass country rock pressure is big simultaneously, comes to press soon, and structural deformation is big, more requires the lock foot stock to have good anchor effect, firmly is connected and in time plays the anchor effect with the steel bow member.
Disclosure of Invention
The embodiment of the invention provides a foot locking anchor rod system suitable for a broken rock mass tunnel and a using method, and aims to solve the problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme.
According to one aspect of the present invention there is provided a locking foot bolt system for use in a fractured rock mass tunnel, comprising: the foot locking anchor rod is of a hollow structure, expandable resin anchoring agents are placed at two ends of the foot locking anchor rod, the expandable resin anchoring agents are wrapped in plastic films, and the expandable resin anchoring agents are filled between the anchor rod and the hole wall through holes under the extrusion and expansion effects after the plastic films are broken through anchoring push rods.
Preferably, an end head anchoring agent is fixed in a hollow part of the front end part of the foot-locking anchor rod, a grout-stopping anchoring agent is fixed in a hollow part of the rear end part of the foot-locking anchor rod, the end head anchoring agent and the grout-stopping anchoring agent are expandable resin anchoring agents, and the end head anchoring agent and the grout-stopping anchoring agent expand in volume when encountering air.
An end head anchoring agent is fixed in the hollow part of the front end part of the foot locking anchor rod, a grout stopping anchoring agent is fixed in the hollow part of the rear end part of the foot locking anchor rod, the end head anchoring agent is an expandable resin anchoring agent, and the grout stopping anchoring agent expands in volume when encountering air.
Preferably, the locking pin bolt is ribbed or threaded on the outside.
Preferably, a grouting pore channel is arranged on the side wall of the anchor rod, close to the rear end of the foot-locking anchor rod, of the end anchor agent, and an exhaust and grout return channel pipe is fixed on the outer side of the side wall of the anchor rod, at the position corresponding to the grout stopping anchor agent.
Preferably, the system still includes blast pipe and stock backing plate, the blast pipe links to each other with exhaust and slurry return passageway pipe, the stock backing plate is fixed with the stand pipe registration arm towards the country rock side, the interior car silk of stand pipe registration arm, the stand pipe passes through the screw thread and is connected with the stand pipe.
Preferably, the anchor pushing rod comprises a crushing head, an anchoring agent squeezer and a pushing rod, wherein the crushing head is a sharp metal component, the anchoring agent squeezer is of a semicircular metal structure, soft rubber is fixed on the outer side of the anchoring agent squeezer, and the outer diameter of the anchoring agent squeezer is equivalent to the hollow inner diameter of the anchor rod.
Preferably, the crushing head is fixedly connected with the anchoring agent squeezer to form a uniform component, the uniform component of the crushing head and the anchoring agent squeezer is connected with the propelling rod through a screw thread, and the end of the propelling rod is turned into a thread.
Preferably, the system further comprises a steel arch, and the steel arch is fixedly connected with the anchor bolt backing plate.
According to another aspect of the invention, there is provided a method of using a foot-locking bolt system for a fractured rock mass tunnel, comprising: the construction process of the foot locking anchor rod and the grouting anchoring process of the foot locking anchor rod are operated in a single cycle;
the single cycle operation lock foot stock work progress includes:
1. prefabricating a foot locking anchor rod and a steel arch frame in a factory according to the foot locking anchor rod design parameters and the steel arch support parameters;
2. after tunnel blasting, primarily spraying concrete;
3. installing a steel arch frame;
4. the guide pipe is installed through the anchor rod base plate and the guide pipe positioning pipe;
5. drilling holes according to the designed length of the foot locking anchor rod, wherein the drilling position is determined by an anchor rod base plate fixed on a steel arch frame, and the drilling angle is controlled by a guide pipe;
6. cleaning holes;
7. connecting the exhaust pipe with an exhaust and slurry return channel pipe;
8. inserting an anchor rod;
9. inserting the anchoring propelling rod into the foot locking anchor rod, and connecting the end part of the anchoring propelling rod with a drilling machine;
10. the anchoring push rod is pushed by the thrust of the drilling machine, and the slurry-stopping anchoring agent and the end anchoring agent are sequentially crushed by the crushing head, so that the anchoring agent enters between the anchor rod and the hole wall through the hole channel under the extrusion action of the anchoring agent extruder to play a role in anchoring;
11. pulling out the anchoring propelling rod;
12. mounting a nut to connect the anchor rod with the anchor rod backing plate 9;
13. installing a protective cover;
14. repeating the step 4 to 12 to complete installation of all the foot locking anchor rods under single cycle operation;
15. and carrying out concrete re-spraying.
Preferably, after the operation of the plurality of single-cycle foot-locking anchor rods is completed, a foot-locking anchor rod grouting anchoring process is performed, wherein the foot-locking anchor rod grouting anchoring process comprises the following steps;
1. preparing a grouting machine and a grouting material;
2. the protective cover 13 is disassembled;
3. the grouting pipe is connected with the end of the anchor rod;
4. grouting according to design parameters;
5. stopping grouting after reaching the standard of stopping grouting;
6. and repeating 2-5 times in sequence to complete the grouting and anchoring of all the foot-locking anchor rods.
According to the technical scheme provided by the embodiment of the invention, the expandable resin anchoring agent is placed at the two ends of the hollow anchor rod, the expandable resin anchoring agent is wrapped in the plastic film, and after the plastic film is crushed by the push rod, the expandable resin anchoring agent is filled between the anchor rod and the hole wall through the hole under the extrusion and expansion effects, so that the rapid anchoring effect is achieved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural view of a foot-locking anchor rod according to an embodiment of the invention;
FIG. 2 is a schematic view of an anchoring push rod according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a steel arch and a bolt backing plate according to an embodiment of the invention;
fig. 4 is a schematic installation diagram of a guide tube 11 according to an embodiment of the present invention;
fig. 5 is a schematic view of the working principle of an anchoring push rod according to an embodiment of the present invention.
The figure includes: 1-anchor sidewall; 2-grout stopping anchoring agent; 3-an end anchor; 4-grouting stopping anchor agent pore canal; 5-end anchor pore channel; 6-grouting pore channels; 7-exhaust and slurry return channel pipe; 8-an exhaust pipe; 9-anchor bolt backing plate; 10, a guide pipe positioning pipe; 11-a guide tube; 12-a nut; 13-a protective cover; 14-a crushing head; 15-an anchoring agent extruder; 16-a push rod; 17-steel arch.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples in conjunction with the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.
The embodiment of the invention provides a foot-locking anchor rod system suitable for a broken rock mass tunnel and a using method thereof, which improve the connection quality, the anchoring quality and the construction quality of a foot-locking anchor rod and a steel arch frame and improve the construction efficiency of the foot-locking anchor rod.
The structure of a foot-locking anchor rod provided by the embodiment of the invention is shown in figure 1. The figure includes: 1-anchor rod side wall, 2-grout stopping anchoring agent, 3-end anchoring agent, 4-grout stopping anchoring agent pore canal, 5-end anchoring agent pore canal, 6-grouting pore canal, 7-exhaust and grout returning channel pipe, 8-exhaust pipe, 9-anchor rod backing plate, 10-guide pipe positioning pipe, 11-guide pipe, 12-nut, 13-protective cover, 14-crushing head, 15-anchoring agent squeezer, 16-push rod and 17-steel arch frame.
The foot-locking anchor rod is of a hollow structure, and in order to improve the anchor rod force, the outer side of the foot-locking anchor rod is provided with ribs or threads. The expandable resin anchoring agent is wrapped in the plastic film, and is filled between the anchor rod and the hole wall through the hole under the extrusion and expansion effects after the plastic film is broken by the anchoring push rod.
An end head anchoring agent 3 is fixed in the hollow part of the front end part of the hollow anchor rod, a grout stopping anchoring agent 2 is fixed in the hollow part of the rear end part of the hollow anchor rod, the grout stopping anchoring agent 2 and the end head anchoring agent 3 adopt expandable resin anchoring agents, and the grout stopping anchoring agent 2 and the end head anchoring agent 3 expand in volume when encountering air. The grout stopping anchoring agent 2 plays a role of grout stopping and plugging, grout is prevented from flowing out of the hole along the gap between anchoring and the hole wall when the anchor rod is grouted, and grouting quality is improved.
The end anchoring agent 3 is wrapped and sealed by a film, and the film is wrapped at the grout stopping anchoring agent pore passage 4 or the end anchoring agent pore passage 5 to form a weak part; the end anchoring agent 3 is fixedly connected with the inner wall of the foot locking anchor rod, so that the end anchoring agent 3 cannot slide along the inner wall of the foot locking anchor rod when the anchoring agent wrapping film is broken.
A grouting pore channel 6 is arranged on the anchor rod side wall 1 of the end head anchoring agent 3 close to the rear end of the foot locking anchor rod.
An exhaust and slurry return channel pipe 7 is fixed on the outer side of the side wall 1 of the anchor rod at the position corresponding to the slurry stop anchoring agent 2, and the exhaust and slurry return channel pipe 7 is made of steel materials related to the anchor rod.
The exhaust pipe 8 is connected to the exhaust and slurry return passage pipe 7. After the exhaust pipe 8 is communicated with the slurry return channel pipe 7, the end head is placed outside the sprayed concrete, and the purpose is to exhaust gas during grouting.
The anchor plate 9 is fixed on the steel arch 17, and the position of the anchor plate is prefabricated in a factory according to design requirements, so that the installation position of the foot-locking anchor is determined. The anchor rod backing plate 9 is fixed with a guide pipe positioning pipe 10 facing the surrounding rock side, and the angle of the guide pipe positioning pipe 10 is prefabricated in a factory according to the design angle of the foot locking anchor rod. The anchor bolt backing plate 9 is provided with a hole, so that drilling and anchor bolt installation are facilitated.
The guide tube positioning tube 10 is internally threaded.
The guide positioning tube 10 is connected with the guide tube 11 through a screw thread. Preferably, the guide tube 11 can be installed before drilling and removed after drilling for reuse.
The diameter of the guide pipe 11 is larger than that of the drill bit, so that the drill bit and the drill rod can conveniently drill holes through the guide pipe 11, a guide effect is achieved, and the drilling angle of the foot locking anchor rod is controlled;
the anchor rod passes through a hollow hole of the anchor rod backing plate 9 and is connected with the anchor rod backing plate 9 through a nut 12;
the protective cover 13 is connected with the end part of the foot-locking anchor rod through a screw thread, so that concrete and muck are prevented from entering the foot-locking anchor rod.
The anchoring propulsion rod provided by the embodiment of the invention is structurally shown in fig. 2, and consists of 14-crushing head, 15-anchoring agent squeezer and 16-propulsion rod. The main function of the anchoring propelling rod is to break the film wrapped by the anchoring agent, to make the anchoring agent contact with air, and to extrude the anchoring agent to enter between the anchoring and the drilling through the pore channel.
The crushing head 14 is a sharp metal member;
the anchoring agent extruder 15 is of a semicircular metal structure, soft rubber is fixed on the outer side of the anchoring agent extruder to play a sealing role, and meanwhile, a lubricant is coated on the soft rubber.
The outside diameter of the anchor squeezer 15 corresponds substantially to the hollow inside diameter of the rock bolt.
The crushing head 14 is fixedly connected with an anchoring agent squeezer 15 to form a unified component.
The end of the push rod 16 is threaded.
The crushing head 14 and the uniform components of the anchoring agent squeezer 15 are connected with the push rod 16 through screw threads, and can be replaced when the crushing head 14 and the anchoring agent squeezer 15 are not used due to the adhesion of the anchoring agent after multiple uses.
The structure of the steel arch frame and the anchor rod backing plate provided by the embodiment of the invention is shown in figure 3. The steel arch 17 is fixedly connected with the anchor rod backing plate 9 and can be prefabricated in a factory according to the design requirement of foot locking anchoring, so that the installation position of a foot locking anchor rod is determined; the anchor bolt backing plate 9 is provided with a hole, so that drilling and anchor bolt installation are facilitated.
The use method of the foot locking and anchoring rod system suitable for the fractured rock mass tunnel comprises the following two main steps: the first step is single cycle operation foot locking anchor rod construction; and the second step is grouting and anchoring of the foot locking anchor rod.
Construction of a single cycle operation locking anchor rod:
1. prefabricating a foot locking anchor rod and a steel arch frame in a factory according to the foot locking anchor rod design parameters and the steel arch support parameters;
2. after tunnel blasting, primarily spraying concrete;
3. installing a steel arch frame;
4. fig. 4 is a schematic installation diagram of a guide tube 11 according to an embodiment of the present invention. Through stock backing plate 9 and stand pipe registration arm 10, installation stand pipe 11, as preferred, when stand pipe registration arm 10 and country rock clearance are not enough to install stand pipe 11, stand pipe 11's exposure length can be adjusted as required, mainly because broken rock mass tunnel surpasss undermining more difficult control, this also is the reason that sets up stand pipe registration arm 10.
5. Drilling according to the designed length of the foot locking anchor rod, wherein the drilling position is determined by an anchor rod base plate 9 fixed on a steel arch frame, and the drilling angle is controlled by a guide pipe 11;
6. cleaning holes;
7. the exhaust pipe 8 and the exhaust and pulp return channel pipe 7 are connected;
8. inserting an anchor rod;
9. inserting the anchoring push rod into the foot locking anchor rod, and connecting the end part of the anchoring push rod with a drilling machine;
10. fig. 5 is a schematic view of the working principle of an anchoring push rod according to an embodiment of the present invention, in which the anchoring push rod is pushed by the pushing force of a drilling machine, and the breaking head 14 breaks the grout-stopping anchoring agent 2 and the end anchoring agent 3 in sequence, so that the anchoring agent enters between the anchor rod and the hole wall through the hole 4 or 5 under the squeezing action of the anchoring agent squeezer 14, thereby performing the anchoring action;
11. pulling out the anchoring propelling rod;
12. mounting a nut 12 to connect the anchor rod with the anchor rod backing plate 9;
13. installing a protective cover 13;
14. and repeating the steps of 4-12 to complete the installation of all the foot locking anchor rods under the single-cycle operation.
15. And carrying out concrete re-spraying.
Because each foot-locking anchor rod adopts the expansive resin anchoring agent to anchor the anchor rod, grouting and anchoring are not needed to be carried out immediately when each anchor rod is installed; after the operation of the plurality of single-cycle foot-locking anchor rods is finished, grouting and anchoring are intensively carried out;
1. preparing a grouting machine and a grouting material;
2. the protective cover 13 is disassembled;
3. the grouting pipe is connected with the end of the anchor rod;
4. grouting according to design parameters;
5. stopping grouting after reaching the standard of stopping grouting;
6. and repeating 2-5 times in sequence to complete the grouting and anchoring of all the foot-locking anchor rods.
In summary, in the embodiment of the invention, the expandable resin anchoring agent is placed at the two ends of the hollow anchor rod, the expandable resin anchoring agent is wrapped in the plastic film, and after the plastic film is crushed by the push rod, the expandable resin anchoring agent is filled between the anchor rod and the hole wall through the hole under the extrusion and expansion effects, so as to play a role in rapid anchoring.
The anchor rod fixing base plate is fixedly connected with the steel arch frame, and the anchor rod fixing base plate is connected with the anchor rod through the nut, so that the determination of the construction position of the anchor rod can be realized, and the connection of the anchor rod and the steel arch frame can be realized.
The anchor rod fixing base plate is provided with a guide pipe fixing device with threads, the guide pipe is installed in the guide pipe fixing device, and during drilling construction, a drill rod is operated through the guide pipe to ensure a drilling angle.
The hollow anchor rod is provided with an exhaust hole close to the orifice through the pipe wall, and after the resin anchoring agent is extruded by the push rod, the hollow anchor rod is used as a grouting channel for grouting. And the resin anchoring agent at the orifice position mainly has the effect of serving as a grout stop plug, so that the problem of orifice leakage is solved, grouting pressure is ensured, and grouting effect is improved.
Because the foot-locking anchor rod is anchored by adopting the expansive resin anchoring agent, grouting reinforcement can be intensively performed after a certain number of foot-locking anchor rods are accumulated, and grouting construction efficiency is improved.
Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
All the embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A lock foot stock system suitable for broken rock mass tunnel, its characterized in that includes: the foot locking anchor rod is of a hollow structure, expandable resin anchoring agents are placed at two ends of the foot locking anchor rod, the expandable resin anchoring agents are wrapped in plastic films, and the expandable resin anchoring agents are filled between the anchor rod and the hole wall through holes under the extrusion and expansion effects after the plastic films are broken through anchoring push rods.
2. The system as claimed in claim 1, wherein an end head anchoring agent is fixed in the hollow part of the front end part of the foot-locking anchor rod, a grout-stopping anchoring agent is fixed in the hollow part of the rear end part of the foot-locking anchor rod, the end head anchoring agent and the grout-stopping anchoring agent are expandable resin anchoring agents, and the end head anchoring agent and the grout-stopping anchoring agent expand in volume when encountering air.
3. The system of claim 1, wherein the foot anchor is ribbed or threaded on the outside.
4. The system as claimed in claim 2, wherein a grouting hole is formed in the side wall of the anchor rod, close to the rear end of the foot-locking anchor rod, of the end anchoring agent, and an exhaust and grout return passage pipe is fixed to the outer side of the side wall of the anchor rod, at the position corresponding to the grout stopping anchoring agent.
5. The system of claim 4, further comprising an exhaust pipe and an anchor plate, wherein the exhaust pipe is connected with the exhaust and grout return passage pipe, a guide pipe positioning pipe is fixed on the side, facing the surrounding rock, of the anchor plate, a thread is machined in the guide pipe positioning pipe, and the guide positioning pipe is connected with the guide pipe through a thread.
6. The system of any one of claims 1 to 5, wherein the anchor pushing rod comprises a crushing head, an anchor squeezer and a pushing rod, wherein the crushing head is a sharp metal member, the anchor squeezer is a semicircular metal structure, soft rubber is fixed on the outer side of the anchor squeezer, and the outer diameter of the anchor squeezer is equivalent to the hollow inner diameter of the anchor rod.
7. The system of claim 6, wherein the crushing head is fixedly connected with the anchoring agent squeezer to form a unified member, the unified member of the crushing head and the anchoring agent squeezer is connected with the propelling rod through a screw thread, and the end of the propelling rod is threaded.
8. The system of claim 6, further comprising a steel arch fixedly connected to the anchor backing plate.
9. A use method of a foot-locking anchor rod system suitable for a fractured rock mass tunnel is characterized by comprising the following steps: the construction process of the foot locking anchor rod and the grouting anchoring process of the foot locking anchor rod are operated in a single cycle;
the single cycle operation lock foot stock work progress includes:
1. prefabricating a foot locking anchor rod and a steel arch frame in a factory according to the foot locking anchor rod design parameters and the steel arch support parameters;
2. after tunnel blasting, primarily spraying concrete;
3. installing a steel arch frame;
4. the guide pipe is installed through the anchor rod base plate and the guide pipe positioning pipe;
5. drilling holes according to the designed length of the foot locking anchor rod, wherein the drilling position is determined by an anchor rod base plate fixed on a steel arch frame, and the drilling angle is controlled by a guide pipe;
6. cleaning holes;
7. connecting the exhaust pipe with an exhaust and slurry return channel pipe;
8. inserting an anchor rod;
9. inserting the anchoring push rod into the foot locking anchor rod, and connecting the end part of the anchoring push rod with a drilling machine;
10. the anchoring push rod is pushed by the thrust of the drilling machine, and the slurry-stopping anchoring agent and the end anchoring agent are sequentially crushed by the crushing head, so that the anchoring agent enters between the anchor rod and the hole wall through the hole channel under the extrusion action of the anchoring agent extruder to play a role in anchoring;
11. pulling out the anchoring propelling rod;
12. mounting a nut to connect the anchor rod with the anchor rod backing plate 9;
13. installing a protective cover;
14. repeating the step 4 to 12 to complete installation of all the foot locking anchor rods under single cycle operation;
15. and carrying out concrete re-spraying.
10. The method of claim 9, performing a foot-lock bolt grouting anchoring process after completion of a plurality of single-cycle foot-lock bolt operations, the foot-lock bolt grouting anchoring process comprising;
1. preparing a grouting machine and a grouting material;
2. the protective cover 13 is disassembled;
3. the grouting pipe is connected with the end of the anchor rod;
4. grouting according to design parameters;
5. stopping grouting after reaching the standard of stopping grouting;
6. and repeating 2-5 times in sequence to complete the grouting and anchoring of all the foot-locking anchor rods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210318693.3A CN114658458A (en) | 2022-03-29 | 2022-03-29 | Foot locking anchor rod system suitable for broken rock mass tunnel and use method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210318693.3A CN114658458A (en) | 2022-03-29 | 2022-03-29 | Foot locking anchor rod system suitable for broken rock mass tunnel and use method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114658458A true CN114658458A (en) | 2022-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210318693.3A Pending CN114658458A (en) | 2022-03-29 | 2022-03-29 | Foot locking anchor rod system suitable for broken rock mass tunnel and use method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024088044A1 (en) * | 2022-10-29 | 2024-05-02 | 中国电建集团昆明勘测设计研究院有限公司 | Partitioned bolt-grouting supporting apparatus and method for large deformation of high-stress tunnel cataclastic rock mass |
-
2022
- 2022-03-29 CN CN202210318693.3A patent/CN114658458A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024088044A1 (en) * | 2022-10-29 | 2024-05-02 | 中国电建集团昆明勘测设计研究院有限公司 | Partitioned bolt-grouting supporting apparatus and method for large deformation of high-stress tunnel cataclastic rock mass |
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