CN111927511B - Steel pipe anchor cable end blasting and grouting combined supporting method and system - Google Patents
Steel pipe anchor cable end blasting and grouting combined supporting method and system Download PDFInfo
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- CN111927511B CN111927511B CN202010743058.0A CN202010743058A CN111927511B CN 111927511 B CN111927511 B CN 111927511B CN 202010743058 A CN202010743058 A CN 202010743058A CN 111927511 B CN111927511 B CN 111927511B
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- grouting
- anchor cable
- supporting
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 91
- 239000010959 steel Substances 0.000 title claims abstract description 91
- 230000008093 supporting effect Effects 0.000 title claims abstract description 43
- 238000005422 blasting Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005553 drilling Methods 0.000 claims abstract description 14
- 239000011347 resin Substances 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 9
- 239000002360 explosive Substances 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 239000011435 rock Substances 0.000 abstract description 24
- 238000004873 anchoring Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 6
- 238000010008 shearing Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 4
- 210000000078 claw Anatomy 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000001976 improved effect Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 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
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
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- 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
- E21D20/025—Grouting with organic components, e.g. resin
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- 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
- E21D21/002—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection using explosives charges
-
- 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
- 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
- E21D21/006—Anchoring-bolts made of cables or wires
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
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)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention belongs to the technical field of roadway support, and discloses a combined support method and a combined support system for blasting and grouting the end parts of anchor cables extending out of a grouting steel pipe in a support drilling hole. The steel pipe is coupled with the hole wall, so that the rock stratum shearing and dislocation resisting effect is achieved, the anchor rope is prevented from being in direct contact with a rock mass, corrosion to an anchor rope body is reduced, the anchor rope is protected, the anchor rope maintains the anchoring effect, the supported rock stratum forms an integral and stable whole, the supporting strength is high, the supporting problem of a large-section roadway or a surrounding rock broken roadway nearby the structure is solved, and the safety problem that the traditional anchor rod and anchor rope obtain the pre-tightening force through stretching and the anchor rod and anchor rope are ejected to injure people when the traditional anchor rod and anchor rope fail is solved.
Description
Technical Field
The invention belongs to the technical field of roadway support, and particularly relates to a grouting reinforcement combined support method and system suitable for the end part of a steel pipe anchor cable of a coal mine roadway after directional blasting.
Background
At present: along with the continuous deepening of coal seam mining depth in China, the problem that surrounding rocks of a roadway are broken and weak is more and more prominent. In a geological structure zone, a stress concentration area and a dynamic pressure affected area, an anchor (net) cable and grouting become important methods for reinforcing and supporting broken weak surrounding rocks. The anchor cable for the coal mine is a prestressed steel strand, the outer end of which is fixed on the surface of surrounding rock of a roadway, and the other end of which is anchored in a deep stable rock mass, and can apply pressure on a structural surface to improve the integrity of the surrounding rock, thereby fundamentally improving the mechanical property of the surrounding rock, effectively controlling the displacement of the rock mass, promoting the stability of the rock mass, and achieving the purposes of preventing a roof from sinking, preventing two sides of walls from caving and the like to stabilize and safety the roadway.
The traditional anchor cable supporting method adopts a mode of anchoring the end part of the resin end, and the damage conditions such as failure of an anchoring layer or breaking and damage of a steel strand and the like easily occur under deep high-stress soft rock geological conditions. Therefore, the deep soft rock tunnel or the large-section tunnel of the coal mine needs to be matched with an anchor rod, an anchor cable, an anchor net, grouting and the like. In a general anchor rod and anchor cable combined supporting method, anchor rods and anchor cables are arranged in an equally-divided mode, the depth of the arranged drill holes is different, and the arrangement scheme is complex. And when the anchor rod is in a soft rock large-deformation roadway or is in transverse dislocation facing a rock stratum, the anchor rod and the anchor cable with high pretightening force are ejected out of the hole at high speed due to the fact that the anchor body at the end part of the supporting system fails or the shearing resistance of the anchor cable is poor, and dangerous accidents are caused.
Through the above analysis, the problems and defects of the prior art are as follows:
(1) the existing anchor rod and anchor cable combined supporting method has different depths of arranging the drill holes and complex arrangement scheme.
(2) In a soft rock large-deformation roadway or when the anchor rod anchor cable transversely moves in the face of a rock stratum, the anchor rod anchor cable is easy to pass through a rod body or a steel strand is ejected from a hole at a high speed, and dangerous accidents are caused.
The difficulty in solving the above problems and defects is:
the significance of solving the problems and the defects is as follows:
on the basis of improving the supporting effect, the occurrence of accidents of hurting people is avoided, and the safety of pedestrians in the mine roadway is improved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a combined support method and a combined support system for blasting and grouting of the end part of a steel pipe anchor cable.
The invention is realized in such a way that a combined support method for blasting and grouting the end part of a steel pipe anchor cable specifically comprises the following steps:
determining a supporting scheme aiming at specific geological conditions of two sides of a top plate and a bottom plate of a roadway to be supported;
drilling a circular drill hole meeting the requirements of the supporting scheme on the hole depth and the angle at a determined position point by using a drilling machine;
step three, sequentially placing the segmented steel pipes into the drill holes, fastening the segmented steel pipes through threaded connection, and mounting a high-strength tray at the tail ends of the steel pipes;
Fixing the end parts of the plurality of anchor cables by using a positioning disc, ensuring that the end parts of the plurality of anchor cables penetrate through the first section of steel pipe (determined by the depth of the front facing hole and the length of the installation steel pipe), fixing the cylindrical explosive in a gap formed by the end parts of the plurality of anchor cables, and fixing the explosive and the anchor cable heads outside the first section of steel pipe. The part is firstly placed into a hole, and after the anchor cable is stretched into the hole, the rear end part of the anchor cable is processed and connected with a rotary flange plate;
step five, directionally blasting the end head of the anchor rod to enable the three anchor cable heads to be scattered and distributed in a claw shape;
installing a resin grouting anchor rod, enabling the grouting anchor rod to penetrate through the rotary flange plate and the steel pipe until the end of the first section of the steel pipe is out, and grouting and reinforcing the end;
and step seven, after the anchoring body is formed and stabilized, connecting a rotary flange (one end part is designed to be capable of being connected with the drill rod) with the drill rod, rotating the rotary flange by utilizing huge torque of the drilling machine to drive the anchor cable, so that the anchor cable in the steel pipe is twisted tightly, and generating pretightening force in the twisting process due to the fact that the end part is anchored.
And step eight, fixing the relative positions of the tray and the rotary flange plate by using the high-strength bolts, and finishing the supporting work.
Further, in the first step, the determining of the supporting scheme includes determining the position angle and the depth of the supporting point, and determining the number of the steel pipes in the single hole and the number and the length of the anchor cables in the steel pipes corresponding to the position angle and the depth.
And further, in the fourth step, the end part of the anchor cable penetrates out of the first section of the steel pipe and extends out by 30-50 cm.
Another object of the present invention is to provide a combined support system for blasting and grouting at an end of a steel pipe anchor cable, comprising:
the steel pipe, the anchor cable, the positioning disc, the high-strength tray and the rotary flange plate;
the steel pipe is provided with the multistage through threaded connection, the anchor rope is worn to establish inside the multistage steel pipe, the positioning disc cover is established at the anchor rope head end, the terminal cover of steel pipe is equipped with high strength tray, the high strength tray outside is fixed with the rotating flange dish through the bolt.
Furthermore, the positioning disc is a resin four-hole disc, three holes are used for penetrating anchor cables, and one hole is used for penetrating grouting anchor rods.
Furthermore, a drill rod connecting end is welded in the center of the outer end of the rotary flange.
By combining all the technical schemes, the invention has the advantages and positive effects that: the invention adopts the grouting of the rear end part of the anchor cable arranged in the steel pipe to blast the end parts of the plurality of anchor cables exposed out of the inner end part of the steel pipe, the blasting of the anchor cable heads expands to form a blasting pre-cracking area, and after grouting, a large-range spherical anchoring body can be realized to realize stable anchoring. The steel pipe body is coupled with the hole wall, so that the rock stratum shearing and dislocation resisting effect is achieved, the anchor cable is prevented from being in direct contact with a rock body, corrosion to the anchor cable body is reduced, the anchor cable is protected, the anchor cable can maintain the anchoring effect, and the supported rock stratum forms a whole and stable whole. Can form the anchor body that stabilizes on a large scale at the anchor rope tip, and possess safer effectual pretightning force and provide the mode and make to be strutted the rock stratum and form firm whole, guarantee to strut quality and effect.
According to the invention, the end part of the anchor cable extending out of the grouting steel pipe in the supporting drill hole is blasted, the end part is anchored by matching with the grouting rod, after the end anchor is successfully anchored, the anchor cable penetrates through the flange plate to be fixed, a plurality of anchor cables are twisted into one strand by utilizing the rotary flange plate and the drilling machine, and the relative position of the flange plate and the tray is fixed by utilizing high-strength bolts, so that high pretightening force is provided for the integral supporting. The method effectively enhances the anchor cable supporting effect, has high supporting strength, particularly solves the supporting problem of a large-section roadway or a surrounding rock broken roadway nearby a structure, and further avoids the safety problem that the traditional anchor rod and anchor cable obtain pretightening force through stretching and the anchor rod and anchor cable are ejected to injure people when the anchor rod and anchor cable fail. And has the following advantages and improvements which the existing support does not have:
(1) the end parts of the plurality of anchor cables extending out of the steel pipes are expanded to the periphery through directional blasting to form claw shapes, and after grouting, a larger-range end part stable anchoring body can be formed. (2) The steel pipes are segmented and connected in a threaded manner, so that underground installation is facilitated. (3) A plurality of anchor cables can be penetrated in the steel pipe according to the requirement. The device is matched with a pretightening force tray for use. In the process of supporting a roadway nearby a structure, when grouting is carried out to realize grouting steel pipes and anchor cables for anchoring, the steel pipes can effectively avoid the shearing effect of surrounding rock migration on anchor rods and anchor cables, and core anchor cables inside a supporting system are protected from being damaged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
Fig. 1 is a flow chart of a combined support method of blasting and grouting at an end of a steel pipe anchor cable according to an embodiment of the invention.
Fig. 2 is a schematic structural view of a combined support system for blasting and grouting at an end of a steel pipe anchor cable provided by an embodiment of the invention.
Fig. 3 is a schematic structural diagram of a drill rod connection end provided by the embodiment of the invention.
Fig. 4 is an explosion diagram of a combined support system for blasting and grouting at the end of a steel pipe anchor cable provided by the embodiment of the invention.
In the figure: 1. a steel pipe; 2. an anchor cable; 3. positioning a plate; 4. a high-strength tray; 5. rotating the flange plate; 6. drill rod link end.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Aiming at the problems in the prior art, the invention provides a combined support method and a combined support system for blasting and grouting of the end part of a steel pipe anchor cable, and the invention is described in detail below by combining the attached drawings.
As shown in fig. 1, the method for combined support of the end of the steel pipe anchor cable by blasting and grouting provided by the embodiment of the invention comprises the following steps:
s101, determining a supporting scheme according to specific geological conditions of two sides of a top plate and a bottom plate of the roadway to be supported.
And S102, drilling a circular drilled hole meeting the hole depth and angle required by the supporting scheme at the determined position point by using a drilling machine.
S103, sequentially placing the segmented steel pipes into the drilled holes, fastening the segmented steel pipes through threaded connection, and installing a high-strength tray at the tail ends of the steel pipes.
S104, fixing the end parts of the anchor cables by using a positioning disc, fixing the cylindrical explosive in gaps formed by the end parts of the anchor cables, fixing the explosive and the head of the anchor cable outside the first section of steel pipe, placing the head of the steel pipe into a hole, and after the anchor cable is stretched into the hole, processing the rear end part of the anchor cable and connecting the rear end part of the anchor cable with a rotary flange plate.
And S105, directionally blasting the end head of the anchor rod to disperse the three anchor cable heads to form claw-shaped distribution.
And S106, installing a resin grouting anchor rod, enabling the grouting anchor rod to penetrate through the rotary flange plate and the steel pipe until the end of the first section of the steel pipe is out, and grouting and reinforcing the end.
And S107, after the anchor body is formed and stabilized, connecting the rotary flange plate with the drill rod, and rotating the rotary flange plate by using the huge torque of the drilling machine to drive the anchor cable so as to tightly twist the anchor cable in the steel pipe.
And S108, fixing the relative positions of the tray and the rotary flange plate by using the high-strength bolts, and finishing the supporting work.
The blasting grouting combined supporting method for the end part of the steel pipe anchor cable provided by the invention can be implemented by other steps by ordinary technicians in the field, and the blasting grouting combined supporting method for the end part of the steel pipe anchor cable provided by the invention in fig. 1 is only a specific embodiment.
In step S101 in the embodiment of the present invention, determining a supporting scheme includes determining an angle and a depth of a supporting point, and determining the number of steel pipes in a single hole and the number and length of anchor cables in the steel pipes corresponding to the angle and the depth.
In step S104 in the embodiment of the invention, the end part of the anchor cable penetrates out of the first section of steel pipe and extends out 30-50 cm.
As shown in fig. 2 to 4, a combined support system for blasting and grouting at an end of a steel pipe anchor cable provided by an embodiment of the present invention includes: the device comprises a steel pipe 1, an anchor cable 2, a positioning disc 3, a high-strength tray 4 and a rotary flange 5;
The positioning disc 3 in the embodiment of the invention is a resin four-hole disc, three holes are used for penetrating anchor cables, and one hole is used for penetrating grouting anchor rods.
The center of the outer end of the rotary flange 5 in the embodiment of the invention is welded with a drill rod connecting groove 6.
The invention is further described with reference to specific examples.
Firstly, determining a supporting scheme aiming at concrete geological conditions of two sides of a top plate and a bottom plate of a roadway to be supported, such as lithology, stress distribution and the like, determining the position angle and depth of a supporting point, and determining the number of steel pipes in a single hole and the number and length of anchor cables in the steel pipes corresponding to the supporting point.
Drilling a round borehole with a depth and an angle meeting the requirements of the supporting scheme at a determined position point by using a drilling machine;
putting the segmented steel pipe into the hole in sequence, fastening through threaded connection, and installing a high-strength tray at the tail end of the steel pipe:
fixing the ends of the three anchor cables by using a positioning disc (a resin four-hole disc, three anchor cables are penetrated through holes, and a grouting anchor rod is subsequently penetrated through one hole), ensuring that the end of the three anchor cables penetrates through a first section of steel pipe (determined by the depth of the front facing hole and the length of the installed steel pipe), extending out a distance (30-50 cm), fixing the cylindrical explosive in gaps formed by the ends of the three anchor cables, and fixing the explosive and the head of the anchor cable outside the first section of steel pipe. The part is firstly placed into the hole, and after the anchor cable is stretched into the hole, the rear end part of the anchor cable is processed and connected with the rotary flange.
Directional blasting is carried out on the end head of the anchor rod, so that the three anchor cable heads are scattered and distributed in a claw shape;
installing a resin grouting anchor rod, penetrating the grouting anchor rod through the rotary flange plate and the steel pipe until the end part of the first section of the steel pipe is out, and grouting and reinforcing the end part;
and seventhly, after the anchoring body is formed and stabilized, connecting a rotary flange plate (one end part is designed to be connected with a drill rod) with the drill rod, rotating the rotary flange plate by utilizing the huge torque of the drilling machine, driving the anchor cable, and screwing the anchor cable in the steel pipe.
Fixing the relative position of the tray and the rotary flange plate by using the high-strength bolt, and finishing the supporting work.
If inefficacy such as outer tray bolt, the anchor rope can not pop out, but rotatory power of unloading, as long as the tip anchor body is firm, can continue to utilize the rig to drive the anchor rope and turn round tightly, provide the pretightning force.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the system or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A combined support method for blasting and grouting of the end part of a steel pipe anchor cable is characterized by comprising the following steps:
determining a supporting scheme aiming at specific geological conditions of two sides of a top plate and a bottom plate of a roadway to be supported;
drilling a circular drill hole which meets the requirements of the supporting scheme on the hole depth and the angle at a determined position point by using a drilling machine;
sequentially placing the segmented steel pipes into the drill holes, fastening the segmented steel pipes through threaded connection, and mounting a high-strength tray at the tail ends of the steel pipes;
fixing the end parts of the plurality of anchor cables by using a positioning disc, fixing the cylindrical explosive in gaps formed by the end parts of the plurality of anchor cables, fixing the explosive and the anchor cable heads outside a first section of steel pipe, placing the head end of the steel pipe into a hole, and after the anchor cables are stretched into the hole, processing the rear end parts of the anchor cables and connecting the rear end parts of the anchor cables with a rotary flange plate;
performing directional blasting on the end head of the anchor rod to disperse the three anchor cable heads to form claw-shaped distribution;
Installing a resin grouting anchor rod, enabling the grouting anchor rod to pass through the rotary flange plate and the steel pipe until the end of the first section of the steel pipe is out, and grouting and reinforcing the end;
after the anchor body is formed and stabilized, the rotary flange plate is connected with the drill rod, and the rotary flange plate is rotated by using huge torque of a drilling machine to drive the anchor cable so as to tightly twist the anchor cable in the steel pipe;
fixing the relative positions of the tray and the rotary flange plate by using high-strength bolts, and finishing the supporting work;
the method comprises the steps of determining the position angle and the depth of a supporting point, and determining the number of steel pipes in a single hole and the number and the length of anchor cables in the steel pipes corresponding to the supporting point.
2. The method for supporting the end of a steel pipe anchor cable by blasting and grouting combined as claimed in claim 1, wherein the end of the anchor cable penetrates through the first section of steel pipe and extends out 30-50 cm.
3. A combined support system for blasting, grouting and supporting the end of a steel pipe anchor cable, which is used in the combined support method for blasting, grouting and supporting the end of a steel pipe anchor cable according to any one of claims 1 to 2, and which comprises:
the steel pipe, the anchor cable, the positioning disc, the high-strength tray and the rotary flange plate;
the steel pipe is provided with the multistage through threaded connection, the anchor rope is worn to establish inside the multistage steel pipe, the positioning disc cover is established at the anchor rope head end, the terminal cover of steel pipe is equipped with high strength tray, the high strength tray outside is fixed with the rotating flange dish through the bolt.
4. The combined support system for blasting, grouting and supporting the end part of a steel pipe anchor cable according to claim 3, wherein the positioning disc is a resin four-hole disc, three holes are used for penetrating the anchor cable, and one hole is used for penetrating a grouting anchor rod.
5. The combined support system for the end portion of the steel pipe anchor cable through blasting grouting as claimed in claim 3, wherein a drill pipe connecting groove is welded in the center of the outer end of the rotary flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010743058.0A CN111927511B (en) | 2020-07-29 | 2020-07-29 | Steel pipe anchor cable end blasting and grouting combined supporting method and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010743058.0A CN111927511B (en) | 2020-07-29 | 2020-07-29 | Steel pipe anchor cable end blasting and grouting combined supporting method and system |
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| CN111927511A CN111927511A (en) | 2020-11-13 |
| CN111927511B true CN111927511B (en) | 2022-05-24 |
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| CN113417680B (en) * | 2021-07-15 | 2022-06-28 | 中铁隆昌铁路器材有限公司 | Anti-anchoring agent rollback piston, anchor rod and method |
| CN114861370B (en) * | 2022-07-05 | 2022-10-04 | 中煤科工开采研究院有限公司 | Design method for roadway anchor rod and anchor cable support in corrosive mine environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3465208B2 (en) * | 1995-09-05 | 2003-11-10 | 清水建設株式会社 | Tunnel excavation method and drilling / lock anchor driving machine used therefor |
| CN2423318Y (en) * | 2000-06-01 | 2001-03-14 | 东北大学 | Explosion expanded rockbolt |
| CN204267060U (en) * | 2014-08-27 | 2015-04-15 | 西山煤电(集团)有限责任公司 | A kind of anchor cable for changing direction |
| CN105178995B (en) * | 2015-10-19 | 2017-12-12 | 河南理工大学 | A kind of multiple grouted anchor bar of side bare weight |
| CN107268618A (en) * | 2016-04-09 | 2017-10-20 | 河南城建学院 | A kind of compound anchoring of enlarged footing and its anchoring process |
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