CN109578034B - High-strength grouting anchor cable with self-exhausting function - Google Patents
High-strength grouting anchor cable with self-exhausting function Download PDFInfo
- Publication number
- CN109578034B CN109578034B CN201910073093.3A CN201910073093A CN109578034B CN 109578034 B CN109578034 B CN 109578034B CN 201910073093 A CN201910073093 A CN 201910073093A CN 109578034 B CN109578034 B CN 109578034B
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- Prior art keywords
- steel wire
- anchor cable
- grouting
- core
- slip casting
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 156
- 239000010959 steel Substances 0.000 claims abstract description 156
- 239000011435 rock Substances 0.000 claims abstract description 20
- 238000007569 slipcasting Methods 0.000 claims abstract description 13
- 239000011440 grout Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 5
- 229910052755 nonmetal Inorganic materials 0.000 claims description 5
- 238000013022 venting Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 5
- 239000002002 slurry Substances 0.000 description 19
- 238000004873 anchoring Methods 0.000 description 13
- 239000003795 chemical substances by application Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 239000003245 coal Substances 0.000 description 6
- 238000005553 drilling Methods 0.000 description 5
- 238000005457 optimization Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008093 supporting effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 239000003829 resin cement Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- -1 i.e. Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process 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
- 239000012466 permeate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Classifications
-
- 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
- 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
-
- 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
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 utility model provides a high strength slip casting anchor rope with from exhausting function, includes anchor rope tray, anchor rope ground tackle and prestressing force steel strand wires, the prestressing force steel strand wires pass anchor rope tray and anchor rope ground tackle setting still be provided with the slip casting pipe on the anchor rope tray, the prestressing force steel strand wires divide into the three-layer, including the core steel wire of inlayer, the smooth round steel wire of intermediate level and outer skin steel wire, the outer disc of core steel wire be fluted steel wire, the smooth round steel wire twist direction of intermediate level be the left-hand direction, smooth round steel wire and the core steel wire of intermediate level closely laminate, the groove diameter on the outer disc of core steel wire be less than the diameter of intermediate level smooth round steel wire slip casting pipe and roadway surrounding rock between be provided with the stop slip casting stopper of control slip casting pipe, this slip casting anchor rope realizes the self-bleeding when the slip casting, need not to set up the blast pipe, slip casting quality is high moreover, reduces construction cost.
Description
Technical Field
The invention relates to the technical field of anchor cables for supporting coal mine roadways, in particular to a high-strength grouting anchor cable with a self-exhausting function.
Background
Along with the increasing of the mining depth of the coal mine, the complexity of the roadway topography is changed, and the conditions of serious surrounding rock breaking, stress concentration and the like are mainly reflected, so that the roadway with poor surrounding rock, a large-section chamber, a crossing point, a fault zone, and the roadway affected by dynamic pressure are formed. The common anchor bolt support can not meet the support requirement, and the support length is required to be increased, so that the anchoring effect is improved. Practice proves that the anchor grouting reinforcement of the roadway surrounding rock in the stress concentration area with larger loosening range and loosening degree has good effect, the anchor grouting reinforcement principle is to combine the supporting effect of the anchor cable with the grouting reinforcement effect to jointly act on the roadway surrounding rock, the grouting anchor cable is used for pressing and injecting organic or inorganic slurry, the anchor cable can be fundamentally ensured to be reliably anchored, the slurry can permeate into coal and rock mass in a larger range around a drilling hole, the bonding and curing effect is generated on the coal and rock mass with loosening, the integrity of the coal and rock mass is obviously improved, and the self-supporting capability of the coal and rock mass is improved, so that the roadway supporting effect is greatly improved.
At present, the common grouting anchor cable mainly comprises a hollow grouting anchor cable and a common grouting anchor cable, wherein the hollow grouting anchor cable adopts a reverse grouting mode, two types of SKZ22-1/1860 and SKZ22-1/1770 are mainly used in the market, the cable body structure is formed by reforming 1X 7 steel strands, the middle steel wire is replaced by a seamless steel tube for grouting, the outer layer is formed by twisting 8 prestressed steel wires, and the middle longer part is required to be replaced by a non-metal hose so as to facilitate installation and construction, the strength of the hollow grouting anchor cable is obviously reduced, the maximum force of the steel strands is only 400kN and is far lower than the maximum force characteristic value 554kN of the steel strands of 1X 19-21.8-1860-GB/T5224-2014, and the hollow grouting anchor cable has no exhaust device, when grouting operation is performed, bubbles and hollows are formed in drilling holes, and the anchoring effect is reduced. And the common grouting anchor cable is provided with an exhaust device, and the common method is to additionally arrange an exhaust pipe, so that the construction is complicated, and the cost is increased.
Disclosure of Invention
The invention aims to provide a high-strength grouting anchor cable with a self-exhausting function, which can realize automatic exhausting during grouting without arranging an exhaust pipe, has high grouting quality and reduces construction cost.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a high strength slip casting anchor rope with from exhaust function, includes anchor rope tray, anchor rope ground tackle and prestressing force steel strand wires, the prestressing force steel strand wires pass anchor rope tray and anchor rope ground tackle setting still be provided with the slip casting pipe on the anchor rope tray, the prestressing force steel strand wires of three-layer divide into two-layer or three-layer, the prestressing force steel strand wires of three-layer include the core steel wire of inlayer, the smooth round steel wire and the outer steel wire of intermediate level, the outer disc of core steel wire be the steel wire that has the recess, the smooth round steel wire twist direction of intermediate level be the left-hand direction, the smooth round steel wire and the core steel wire of intermediate level closely laminate, the diameter of recess on the outer disc of core steel wire be less than the diameter of intermediate level smooth round steel wire slip casting pipe and roadway surrounding rock between be provided with the grout stop plug of control slip casting pipe.
As optimization, the outer circular surface of the core steel wire is provided with grooves which are arranged in parallel, the grooves are arranged along the axial direction of the core steel wire, and the number of the grooves can be 2, 3 or 4.
Preferably, the outer layer steel wire can be selected from a notch steel wire, a spiral rib steel wire or a smooth round steel wire.
As optimization, the grout stop plug is made of nonmetal materials, and a through hole for penetrating through the grouting pipe is formed in the grout stop plug.
As optimization, the anchor cable tray is of an arch structure, a round hole for passing through the prestress steel strand is formed in the middle of the anchor cable tray, and a through hole for passing through the grouting pipe is formed in the side face of the anchor cable tray.
As optimization, the grouting pipe is made of PVC, a quick connector is arranged at one end of the grouting pipe, and the grouting pipe is connected with grouting equipment quickly through the quick connector.
As optimization, the outside of anchor rope tray be provided with the anchor rope ground tackle, the anchor rope ground tackle pass prestressing force steel strand wires and install, the anchor rope ground tackle include anchor ring, clamping piece and O type circle.
The beneficial effects of the invention are as follows: compared with the prior art, the high-strength grouting anchor cable with the self-exhaust function has the advantages that the anchor cable body is optimized and improved based on a 1X 19 Luxi structure, the core part is replaced by the prestressed steel wire with the grooves, the twisting clearance between the core part and the outer layer steel strand is increased, the strength of the grouting anchor cable is improved, when high-pressure grouting operation is carried out, air in a drill hole and surrounding rock cracks can be exhausted out of the drill hole through the grooves on the outer circular surface of the core part steel wire, the problem of generating bubbles or cavities is solved, the anchoring effect is greatly improved, other exhaust devices are not required to be additionally arranged, the operation procedure is simplified, the supporting cost is reduced, and the working efficiency is improved.
Drawings
FIG. 1 is a general block diagram of the present invention;
FIG. 2 is an enlarged cross-sectional view of the prestressed steel strand of the present invention;
FIG. 3 is an enlarged view of the construction of the grouting pipe according to the present invention;
FIG. 4 is a schematic diagram of the exhaust gas during grouting operation according to the present invention;
the cable comprises a prestressed steel strand, a slurry stopping pipe, an anchor cable tray, a slurry injecting pipe, an anchor cable, a core steel wire, a smooth round steel wire, an outer layer steel wire, a roadway surrounding rock, an anchoring section, a slurry injecting section and a groove, wherein the prestressed steel strand is 1, the slurry stopping pipe is 2, the anchor cable tray is 3, the slurry injecting pipe is 4, the anchor cable is 5, the core steel wire is 6, the smooth round steel wire is 7, the outer layer steel wire is 8, the roadway surrounding rock is 9, the anchoring section is 10, the slurry injecting section is 11, and the groove is 12.
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.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
As shown in fig. 2, the high-strength grouting anchor cable with the self-exhaust function comprises an anchor cable tray 3, an anchor cable anchorage device 5 and a prestress steel strand 1, wherein the prestress steel strand 1 passes through the anchor cable tray 3 and the anchor cable anchorage device 5 and is further provided with a grouting pipe 4, the prestress steel strand 1 is divided into three layers, namely a core steel wire 6 of an inner layer, a smooth round steel wire 7 of a middle layer and an outer layer steel wire 8 of an outer layer, the outer round surface of the core steel wire 6 is a steel wire with a groove 12, the twisting direction of the smooth round steel wire 7 of the middle layer is a left-handed direction, the smooth round steel wire 7 of the middle layer is tightly attached to the core steel wire 6, the diameter of the groove 12 on the outer round surface of the core steel wire 6 is smaller than the diameter of the smooth round steel wire 7 of the middle layer, and a grouting plug 2 for controlling the grouting pipe 4 is arranged between the grouting pipe 4 and the roadway surrounding rock 9.
The grouting pipe, the grouting plug, the anchor cable tray and the anchor cable anchorage device are sequentially arranged on the prestress steel strand, the innermost side of the prestress steel strand is a core steel wire, the core steel wire is a round prestress steel wire, grooves which are arranged on the outer circular surface of the prestress steel wire and distributed along the axial direction are uniformly distributed along the outer circular surface of the core steel wire, the number of the grooves can be 2, 3 or 4, the optimal selection is 3 grooves, the stress of the core steel wire is ensured, the sufficient exhaust function can be ensured, the left-handed smooth round steel wire is arranged on the outer layer of the core steel wire, the gap between the twisted steel wires is reduced through the smooth round steel wire, the tightness in grouting is ensured, the air in a borehole can only be discharged out of the borehole through the grooves of the core steel wire, the outermost layer is the steel wire with higher strength and the rigidity of the integral prestress steel strand is ensured, the self-venting function of the grouting anchor cable is realized through the axial grooves on the core steel wires of the prestressed steel strands, after grouting is carried out in the drill holes, air in the drill holes and the surrounding rock walls of the roadways enters the prestressed steel strands through the grooves in the middle of the prestressed steel strands and gaps between the twisted steel wires after grouting is carried out in the drill holes, and finally the air is discharged out of the holes, so that the injected slurry can not occupy the whole drill holes after gas is discharged, the filling of the slurry is realized, and the setting of a vent pipe is reduced, and the grouting device does not occupy space, reduces the cost of the anchor cable, improves the grouting efficiency, and improves the grouting effect.
The outer circular surface of the core steel wire 6 is provided with grooves 12 which are arranged in parallel, the grooves 12 are arranged along the axial direction of the core steel wire 6, and the number of the grooves 12 can be selected to be 2, 3 or 4.
The outer layer steel wire 8 can be selected from a notch steel wire, a spiral rib steel wire or a smooth round steel wire.
The grout stop plug 2 is made of nonmetal materials, and a through hole for passing through the grouting pipe 4 is formed in the grout stop plug 2.
The anchor cable tray 3 is of an arch structure, a round hole for passing through the prestress steel strand 1 is formed in the middle of the anchor cable tray 3, and a through hole for passing through the grouting pipe 4 is formed in the side face of the anchor cable tray 3.
The grouting pipe 4 is made of PVC, a quick connector is arranged at one end of the grouting pipe 4, and the grouting pipe is connected with grouting equipment quickly through the quick connector.
The outer side of the anchor rope tray 3 is provided with an anchor rope anchorage device 5, the anchor rope anchorage device 5 penetrates through the prestress steel strand 1 to be installed, and the anchor rope anchorage device 5 comprises an anchor ring, a clamping piece and an O-shaped ring.
In fig. 1, 1 is a prestress steel strand, the structure of which is 1×19 luxi, and the sectional view of which is shown in fig. 2. The core steel wire is replaced by a steel wire with grooves, the number of the grooves is 2, 3 and 4, and 3 grooves are preferentially selected. The first layer from the core part to the outside is a smooth round steel wire, and the twisting direction is a left-hand direction. The smooth round steel wires are adopted to reduce the gaps among the steel wires after twisting. The outermost layer adopts a scoring type, a spiral rib or a smooth round steel wire, and a preferable spiral rib steel wire.
The smooth round steel wire in the middle layer of the prestress steel strand adopts a left-hand direction, and meanwhile, the steel wire in the outer layer also adopts the left-hand direction, so that gaps between the steel wires and between the steel wire layer and the steel wire layer can be reduced, and the gaps can only be guaranteed to pass through air, and grouting slurry can not pass through the gaps between the steel wire layers due to the fact that the slurry belongs to a non-Newtonian fluid, so that air in holes can be discharged when grouting is performed in a drilling mode, the slurry can not be discharged, the space occupied by the air is replaced by the slurry, and grouting operation is achieved.
In fig. 1, the slurry plug is made of rubber or other nonmetallic materials and is used for plugging a drilling hole 2. The end face of the grouting plug is provided with a through hole for passing through the grouting pipe.
The grout stop plug passes through the prestress wire and is arranged, and is inserted into the drill hole, the seal of the drill hole is realized through the plasticity of the grout stop plug, the grouting operation is carried out through the grouting pipe, the pressure in the drill hole is increased after the grouting operation is completed, the grout forms a certain pressure to the grout stop plug along with the increase of the pressure, and the grouting pipe inside is pressed after the grout stop plug is pressed, so that the grouting is stopped.
In fig. 1, 3 is an anchor cable tray, which has an arch structure and is made of steel plates. Through holes are drilled in the arched positions.
In fig. 1, 4 is a grouting pipe, the grouting pipe is made of PVC or other nonmetal materials with certain plasticity, and one end of the grouting pipe is provided with a quick connector, so that the grouting pipe is convenient to connect with grouting equipment. The other end passes through the anchor cable tray and the grout stop plug to be inserted into the drill hole. Fig. 3 is a schematic structural diagram.
In fig. 1, 5 is an anchor cable anchorage device, which consists of an anchor ring, a clamping piece and an O-shaped ring.
The specific working steps and principles are as follows: as shown in fig. 4, the surrounding rock 9 of the roadway to be supported is first perforated, a resin anchoring agent of a certain length is pushed into the bottom of the hole by a prestress steel strand, and then the anchoring agent is stirred. (the anchoring section is formed by the anchoring agent is formed by the curing agent and the resin cement, the curing agent and the resin cement are separated by the film, when the steel strand is stirred for the anchoring agent, the film is destroyed, the curing agent and the resin cement are fully mixed for reaction, the gel time can be divided into ultrafast, fast, medium speed and slow speed according to the time, and the anchoring section 10 is formed after the anchoring agent is solidified according to the installation process, and the anchoring section is formed by reacting and curing MT146.2-2011. And penetrating the grouting pipe into the grouting plug through hole, then installing the grouting pipe on a steel twisted wire, and sequentially placing the anchor cable tray and the anchor cable anchorage device and tensioning the grouting pipe. After tensioning, one end of the grouting pipe is connected with a grouting pump to start grouting operation, and grouting pressure is 0.4-0.5MPa. The grouting pressure is shown by a pressure gauge, and the grouting pressure is a constant value. The grouting process is actually a process that the slurry cleans the air in the drill hole and surrounding rock fracture. The slurry is a non-Newtonian fluid prepared from 425# Portland cement and additives. (this can be interpreted as hundred degrees, what is meant is a viscous liquid, i.e., liquid cannot pass through the strand gaps, and air can escape through the gaps) the slurry cannot enter the exhaust passage through the wire lay gap. When the air in the drill hole and surrounding rock cracks is exhausted, the grouting pressure will appear to exceed the peak value of the normal grouting pressure because no air is exhausted. This may then represent that the borehole and surrounding rock fissures have been filled with slurry to form the grouting section 11.
In the embodiment shown in fig. 2, three grooves are formed in the core steel wire of the prestressed steel strand, the diameter of each groove is smaller than that of the middle steel wire, the middle steel wire layer is wound on the outer surface of the core steel wire in a left-hand mode, gas flow between the core steel wire and the middle steel wire can be achieved through the grooves, as shown in fig. 3, on the cross section of the prestressed steel strand, the grooves are uniformly distributed on the core steel wire in a circumferential mode, air around the prestressed steel strand can enter the grooves, the air is discharged out of the holes through the prestressed steel strand, the optimal number of the grooves is 3, the strength of the core steel wire can be guaranteed on the premise that gas discharge from drilling can be guaranteed, the grooves are arc-shaped grooves, the diameter of each groove is smaller than that of the middle steel wire, and the grooves are not blocked by the middle steel wire when the middle steel wire is wound.
As another embodiment, the prestress wire is divided into two layers, comprising a core steel wire of an inner layer and an outer layer steel wire of an outer layer, and the outer circle surface of the core steel wire is a steel wire with a groove.
The foregoing embodiments are merely specific examples of the present invention, and the scope of the present invention includes, but is not limited to, the forms and styles of the foregoing embodiments, and any suitable changes or modifications made by those skilled in the art consistent with the present invention shall fall within the scope of the present invention.
Claims (5)
1. A high strength slip casting anchor rope with from exhausting function, its characterized in that: the novel anchor cable comprises an anchor cable tray (3), an anchor cable anchorage device (5) and a prestress steel strand (1), wherein the prestress steel strand (1) penetrates through the anchor cable tray (3) and the anchor cable anchorage device (5), a grouting pipe (4) is further arranged on the anchor cable tray (3), and the prestress steel strand (1) is three layers; the prestress steel strand (1) comprises an inner layer of core steel wire (6), an intermediate layer of smooth round steel wire (7) and an outer layer of outer layer steel wire (8); the core steel wire (6) is a steel wire with grooves (12) on the outer circular surface, the twisting direction of the smooth steel wire (7) of the middle layer is a left-handed direction, the smooth steel wire (7) of the middle layer is tightly attached to the core steel wire (6), the diameter of the grooves (12) on the outer circular surface of the core steel wire (6) is smaller than that of the smooth steel wire (7) of the middle layer, and a grout stop plug (2) for controlling the grouting pipe (4) is arranged between the grouting pipe (4) and the roadway surrounding rock (9); grooves (12) which are arranged in parallel are formed in the outer circular surface of the core steel wire (6), the grooves (12) are arranged along the axial direction of the core steel wire (6), and the number of the grooves (12) is 2, 3 or 4; the flow of gas is realized between the core steel wire and the middle steel wire through the grooves; the outer layer steel wire (8) is a scoring steel wire, a spiral rib steel wire or a smooth round steel wire.
2. The high strength grouting anchor cable with self-venting function according to claim 1, wherein: the grouting stop (2) is made of nonmetal materials, and a through hole for penetrating through the grouting pipe (4) is formed in the grouting stop (2).
3. The high strength grouting anchor cable with self-venting function according to claim 1, wherein: the anchor cable tray (3) is of an arch structure, a round hole for passing through the prestress steel strand (1) is formed in the middle of the anchor cable tray (3), and a through hole for passing through the grouting pipe (4) is formed in the side face of the anchor cable tray (3).
4. The high strength grouting anchor cable with self-venting function according to claim 1, wherein: the grouting pipe (4) is made of PVC, a quick connector is arranged at one end of the grouting pipe (4), and the grouting pipe is connected with grouting equipment quickly through the quick connector.
5. The high strength grouting anchor cable with self-venting function according to claim 1, wherein: the outer side of the anchor cable tray (3) is provided with an anchor cable anchorage device (5), the anchor cable anchorage device (5) penetrates through the prestress steel strand (1) to be installed, and the anchor cable anchorage device (5) comprises an anchor ring, a clamping piece and an O-shaped ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910073093.3A CN109578034B (en) | 2019-01-25 | 2019-01-25 | High-strength grouting anchor cable with self-exhausting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910073093.3A CN109578034B (en) | 2019-01-25 | 2019-01-25 | High-strength grouting anchor cable with self-exhausting function |
Publications (2)
| Publication Number | Publication Date |
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| CN109578034A CN109578034A (en) | 2019-04-05 |
| CN109578034B true CN109578034B (en) | 2023-09-15 |
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| CN201910073093.3A Active CN109578034B (en) | 2019-01-25 | 2019-01-25 | High-strength grouting anchor cable with self-exhausting function |
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