CN108533299B - A method of explosion and anchors rock mass anchor pole - Google Patents
A method of explosion and anchors rock mass anchor pole Download PDFInfo
- Publication number
- CN108533299B CN108533299B CN201810354880.0A CN201810354880A CN108533299B CN 108533299 B CN108533299 B CN 108533299B CN 201810354880 A CN201810354880 A CN 201810354880A CN 108533299 B CN108533299 B CN 108533299B
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- China
- Prior art keywords
- hole
- rod
- anchor pole
- explosion
- anchor
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000004880 explosion Methods 0.000 title claims abstract description 32
- 239000011435 rock Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000005422 blasting Methods 0.000 claims abstract description 15
- 239000002002 slurry Substances 0.000 claims description 38
- 238000000638 solvent extraction Methods 0.000 claims description 10
- 238000004873 anchoring Methods 0.000 claims description 9
- 239000002360 explosive Substances 0.000 claims description 7
- 238000005360 mashing Methods 0.000 claims description 7
- 238000007711 solidification Methods 0.000 claims description 7
- 230000008023 solidification Effects 0.000 claims description 7
- 238000005553 drilling Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 239000011083 cement mortar Substances 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 210000003414 extremity Anatomy 0.000 description 15
- 238000010586 diagram Methods 0.000 description 3
- 210000003127 knee Anatomy 0.000 description 3
- 230000007774 longterm Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000007569 slipcasting Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/002—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
- 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
- E21D21/008—Anchoring or tensioning means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0093—Accessories
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
A method of explosion and anchors rock mass anchor pole, including the body of rod, body of rod upper end closed, and blind plate is equipped in body of rod upper end, encloses a cavity jointly by blind plate and the body of rod, and the blasting charge is equipped in cavity, first through hole is offered on blind plate；Multiple top spleniums are equipped in cavity, each top splenium is uniformly distributed around body of rod axis, the jack unit includes the elastic slice that lower end is fixedly connected on cavity lower end, elastic slice upper end is connected with thrusting plate, elastic slice pushes thrusting plate to be resisted against on the blasting charge on one side, thrusting plate other end is fixedly connected with a mandril, mandril is fixedly connected after the second through-hole with snap-gauge far from elastic slice one end, the present invention is for solving the problem of that anchor pole is easy to extract from cement mortar and lose anchorage effect under extraneous environmental activity.
Description
Technical field
The present invention relates to a kind of explosion anchor poles and the method anchored to rock mass.
Background technique
A large amount of slope projects involved in the construction of highway in China, railway and infrastructure, slope reinforcement are in this engineering
Important component, the reinforcement form being widely used at present is anchorage technology, but common anchor pole is due to the effect with side slope
Power is single, and lacks the structure that card resistance is carried out between side slope, under long-term external environment effect, is easy to pull out from water slurry
Out, or together with slurry it extracts, to lose anchorage effect, long-term slope cannot be made steadily to guarantee safety.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of explosion anchor poles and the method anchored to rock mass, for solving
Certainly anchor pole is easy the problem of extracting from cement mortar and losing anchorage effect under extraneous environmental activity.
In order to solve the above-mentioned technical problem, the technical solution of the present invention is as follows:
A kind of explosion anchor pole, including the body of rod, body of rod upper end closed are equipped with blind plate, by blind plate and the body of rod in body of rod upper end
A cavity is enclosed jointly, and the blasting charge is equipped in cavity, first through hole is offered on blind plate；
A plurality of partitioning slot is equipped on cavity inner wall, each partitioning slot is uniformly distributed around body of rod axis, by partitioning slot
Cavity inner wall is divided into muti-piece limb；
It is equipped with groove on limb, snap-gauge is equipped in groove, snap-gauge upper end is fixedly connected with groove upper end, in groove-bottom
Face is equipped with the second through-hole；
Multiple top spleniums are equipped in cavity, each top splenium is uniformly distributed around body of rod axis, the jack unit packet
The elastic slice that lower end is fixedly connected on cavity lower end is included, elastic slice upper end is connected with thrusting plate, and elastic slice pushes thrusting plate to be resisted against on one side
On the blasting charge, thrusting plate other end is fixedly connected with a mandril, mandril far from elastic slice one end pass through the second through-hole after with card
Plate is fixedly connected.
The shape of first through hole is up-thin-low-thick truncated cone-shaped, and one piece of envelope is fixedly installed on the aperture of first through hole upper end
Close baffle.
It is connected with a hollow screw in body of rod lower end, washer and nut are installed in hollow screw, in washer face
It is equipped with rubber pad.
Snap-gauge upper end and the groove upper end body of rod are integrally formed, and the angle that snap-gauge is connect with groove is arc-shaped.
A notch is equipped on elastic slice.
Angle between each limb and blind plate is arc-shaped.
The method that a kind of pair of rock mass is anchored, includes the following steps:
The first step, according to design requirement to anchorage point measurement and positioning, anchor hole is drilled out in slope surface using drilling machine；
Second step has been cleared up in anchor hole after impurity, and anchor pole is put into anchor hole, and igniting blasting explosive, so that anchor hole
Hole is formed under the action of explosion on bottom, while under the action of explosion, and each piece of limb is bent outwardly, mandril pushes snap-gauge curved
Song goes out groove and forms barb, closes baffle at the same time and is blasted from first through hole；
Slurry is circulated into the body of rod by third step using mashing pump by hollow screw, and slurry passes through first along the body of rod and leads to
It enters in hole behind hole, is finally discharged by the gap between the body of rod and anchor hole, after slurry solidification, complete the anchoring of anchor pole.
When proceeding to third step, after slurry is discharged by the gap between the body of rod and anchor hole, washer and nut are installed to
In hollow screw, the gap between anchor hole and anchor pole is closed using washer and rubber pad, is then continued using mashing pump
Slurry is poured into, enters slurry in the subtle gap in hole, after slurry solidification, completes the anchoring of anchor pole.
The beneficial effects of the present invention are:
1, explosive pops in the cavities, so that each piece of limb expands outwardly, the gas for generation of exploding impacts anchor hole hole wall rock
Body crushes hole wall rock mass and is pressurized, forms hole, and at the same time, mandril pushes snap-gauge to be bent outwardly to form barb, each piece of snap-gauge
A card resistance structure is formed in hole, can thus anchor pole be effectively prevent to extract from anchor hole, then from anchor pole into hole
Slurry is poured into, after slurry solidification, so that anchor pole is formed thick outer thin resistance to plucking structure in one, to enhance the resistance to plucking energy of anchor pole
Power improves safety when side slope uses.
2, closing baffle makes explosive explode in a closed space, after explosion for closing to first through hole
Closing baffle is preferentially discharged by the air-flow of generation from first through hole, is then pushing thrusting plate and limb expansion, so not
The validity of detonation of a cartridge only can be improved, and be also prevented from the body of rod and blasted from anchor hole, while ensuring first through hole energy
It is enough to be passed through by slurry.
3, snap-gauge and the angle of groove connection are that arc-shaped this structure enables snap-gauge to be bent in circular arc, are avoided
Stress is excessively concentrated, and snap-gauge is prevented to be broken in knee.
4, before explosion, the blasting charge is fixed by top splenium, and after explosion, elastic slice is broken by incision, mandril and thrusting plate with
Snap-gauge is displaced outwardly, and at this moment can be limited by excurvation stroke of the thrusting plate to snap-gauge, snap-gauge overflexing be prevented, to mention
The reliability of the anchoring of snap-gauge after height explosion.
5, the angle between limb and blind plate is arc-shaped, and stress is avoided excessively to concentrate, and limb is prevented to be broken in knee.
6, after slurry is by the gap discharge between the body of rod and anchor hole, using washer and rubber pad between anchor hole and anchor pole
Gap is closed, and after continuing the slip casting into hole by force, so that the slurry pressure in hole increases, slurry is pressed into
After explosion in rock mass fine gap, the faulted joint in rock mass hole is filled, with integral to fracture rock mass adhesion, in turn
Further increase the stability and fixing of anchoring.
Detailed description of the invention
Following further describes the present invention with reference to the drawings:
Fig. 1 is the schematic diagram of the section structure of the invention,
Fig. 2 is partial enlargement structural representation of the invention,
Fig. 3 is the schematic diagram of the section structure after the explosion of body of rod one end of the present invention,
Fig. 4 is overlooking structure diagram of the invention,
Fig. 5 is schematic view of the front view of the invention,
Fig. 6 is schematic view of the front view when in use of the invention.
In figure: the body of rod 1, the blasting charge 2, blind plate 3, top splenium 4, snap-gauge 5, closing baffle 6, anchor hole 7, washer 8, partitioning slot
11, limb 12, cavity 13, the second through-hole 14, first through hole 31, elastic slice 41, thrusting plate 42, mandril 43, groove 51, hole 71,
Rubber pad 81, hollow screw 82, nut 83.
Specific embodiment
A kind of explosion anchor pole, including the body of rod 1,1 upper end closed of the body of rod are equipped with blind plate 3, by 3 He of blind plate in 1 upper end of the body of rod
The body of rod 1 encloses a cavity 13 jointly, and the blasting charge 2 is equipped in cavity 13, first through hole 31 is offered on blind plate 3；
A plurality of partitioning slot 11 is equipped on 13 inner wall of cavity, each partitioning slot 11 is uniformly distributed around 1 axis of the body of rod, by
13 inner wall of cavity is divided into muti-piece limb 12 by partitioning slot 11；
It is equipped with groove 51 on limb 12, snap-gauge 5, the fixed company in 5 upper end of snap-gauge and 51 upper end of groove are equipped in groove 51
It connects, the second through-hole 14 is equipped on 51 bottom surface of groove；
Multiple top spleniums 4 are equipped in cavity 13, each top splenium 4 is uniformly distributed around 1 axis of the body of rod, the press dress
The elastic slice 41 that 13 lower end of cavity is fixedly connected on including lower end is set, 41 upper end of elastic slice is connected with thrusting plate 42, and elastic slice 41 pushes away
Power piece 42 is resisted against on one side on the blasting charge 2, and 42 other end of thrusting plate is fixedly connected with a mandril 43, and mandril 43 is far from elastic slice
41 one end are fixedly connected after passing through the second through-hole 14 with snap-gauge 5.A notch is equipped on elastic slice 41.
Explosive pops in cavity 13, so that each piece of limb 12 expands outwardly, the gas for generation of exploding impacts 7 hole wall of anchor hole
Rock mass crushes hole wall rock mass and is pressurized, forms hole 71, and at the same time, mandril 43 pushes snap-gauge 5 to be bent outwardly to form barb,
Each piece of snap-gauge 5 forms a card resistance structure in hole 71, thus anchor pole can be effectively prevent to extract from anchor hole 7, then by
Anchor pole pours into slurry into hole 71, and slurry can be epoxy resin, after slurry solidification, forms anchor pole thick outer thin in one
Resistance to plucking structure improve safety when side slope uses to enhance the breakout capacity of anchor pole.
Wherein the effect of top splenium 4 is: before explosion, the blasting charge 2 is fixed by top splenium 4；After explosion, elastic slice 41 is by cutting
It is broken at mouthful, mandril 43 and thrusting plate 42 are displaced outwardly with snap-gauge 5, at this moment can be by thrusting plate 42 to the excurvation row of snap-gauge 5
Cheng Jinhang limit, prevents 5 overflexing of snap-gauge, with the reliability of the anchoring of snap-gauge 5 after raising explosion.
The shape of first through hole 31 is up-thin-low-thick truncated cone-shaped, is fixedly installed one on 31 upper end aperture of first through hole
Block closes baffle 6.
Closing baffle 6 makes explosive explode in a closed space, after explosion for closing to first through hole 31
Closing baffle 6 is preferentially discharged by the air-flow of generation from first through hole 31, then thrusting plate 42 and limb 12 is being pushed to expand,
The validity that the explosion of the blasting charge 2 not only can be improved, and is also prevented from the body of rod 1 and is blasted from anchor hole 7, while ensuring the
One through-hole 31 can be passed through by slurry.The truncated cone-shaped structure of first through hole 31 can be convenient the ejection of baffle 6, anti-stop tab 6
Bite is in first through hole 31.
It is connected with a hollow screw 82 in 1 lower end of the body of rod, washer 8 and nut 83 are installed in hollow screw 82,
8 end face of washer is equipped with rubber pad 81.Hollow screw 82 can be removed from the body of rod 1, be substituted for anchor pole extension bar, at the same be also used for
Mashing pump docking；Washer 8 and rubber pad 81 are for closing the gap between the body of rod 1 and anchor hole 7.
5 upper end of snap-gauge and the 51 upper end body of rod 1 of groove are integrally formed, and the angle that snap-gauge 5 is connect with groove 51 is arc-shaped.This
Kind structure can excessively be concentrated to avoid stress, and snap-gauge 5 is prevented to be broken in knee.
Angle between each limb 12 and blind plate 3 is arc-shaped.
The method that a kind of pair of rock mass is anchored, includes the following steps:
The first step, according to design requirement to anchorage point measurement and positioning, anchor hole 7 is drilled out in slope surface using drilling machine, and
Anchor hole 7 is cleared up using compressed air or clear water afterwards, the dust in hole is blown out, in order to energy between slurry and rock
Enough good bondings；
Second step has been cleared up in anchor hole 7 after impurity, anchor pole is put into anchor hole 7, and igniting blasting explosive, so that anchor
Hole 71 is formed under the action of explosion on 7 bottom of hole, while under the action of explosion, and each piece of limb 12 be bent outwardly, mandril 43
It pushes snap-gauge 5 to be bent out groove 51 and forms barb, close baffle 6 at the same time and blasted from first through hole 31；
Slurry is circulated into the body of rod 1 by third step using mashing pump by hollow screw 82, and slurry passes through the along the body of rod 1
It enters in hole 71 after one through-hole 31, is finally discharged by the gap between the body of rod 1 and anchor hole 7, after slurry solidification, complete anchor
The anchoring of bar.
When proceeding to third step, after slurry is discharged by the gap between the body of rod 1 and anchor hole 7, washer 8 and nut 83 are pacified
It is attached in hollow screw 82, the gap between anchor hole 7 and anchor pole is closed using washer 8 and rubber pad 81, is then used
Mashing pump continues to pour into slurry, enters slurry in the subtle gap in hole 71, after slurry solidification, completes the anchor of anchor pole
Gu.
After hole 71 is blasted, some fine cracks between rock mass, low pressure slurry is difficult to enter into crack, so can
To be closed using washer 8 and rubber pad 81 to the gap between anchor hole 7 and anchor pole, both slurry hole out was closed,
Continue the slip casting into hole 71, so that the slurry pressure abruptly increase in hole 71, slurry is pressed into fine gap, to rock mass
Faulted joint in hole 71 is filled, with to fracture rock mass adhesion it is integral, and then further increase anchoring stability and
Fixing.
Claims (8)
1. a kind of explosion anchor pole, including the body of rod (1), the body of rod (1) upper end closed, it is characterised in that: be equipped in the body of rod (1) upper end
Blind plate (3) encloses a cavity (13) by blind plate (3) and the body of rod (1) jointly, be equipped in the cavity (13) blasting charge (2) and
Jack unit offers first through hole (31) on blind plate (3)；
A plurality of partitioning slot (11) are equipped on cavity (13) inner wall, each partitioning slot (11) is uniformly divided around the body of rod (1) axis
Cavity (13) inner wall is divided into muti-piece limb (12) by partitioning slot (11) by cloth；
Groove (51) are equipped on limb (12), are equipped with snap-gauge (5) in groove (51), on snap-gauge (5) upper end and groove (51)
End is fixedly connected, and is equipped with the second through-hole (14) on groove (51) bottom surface；
Multiple top spleniums (4) are equipped in cavity (13), each top splenium (4) is uniformly distributed around the body of rod (1) axis, the top
Pressure device includes the elastic slice (41) that lower end is fixedly connected on cavity (13) lower end, and elastic slice (41) upper end is connected with thrusting plate (42),
Elastic slice (41) pushes thrusting plate (42) to be resisted against on the blasting charge (2) on one side, thrusting plate (42) other end and a mandril (43)
It is fixedly connected, mandril (43) passes through the second through-hole (14) far from elastic slice (41) one end and is fixedly connected afterwards with snap-gauge (5).
2. a kind of explosion anchor pole according to claim 1, it is characterised in that: the shape of first through hole (31) is up-thin-low-thick
Truncated cone-shaped, one piece of closing baffle (6) is fixedly installed on first through hole (31) upper end aperture.
3. a kind of explosion anchor pole according to claim 2, it is characterised in that: the body of rod (1) lower end be connected with one it is hollow
Screw rod (82) is equipped with washer (8) and nut (83) on hollow screw (82), and rubber pad is equipped on washer (8) end face
(81).
4. a kind of explosion anchor pole according to claim 1, it is characterised in that: side pole on snap-gauge (5) upper end and groove (51)
Body (1) is integrally formed, and the angle that snap-gauge (5) is connect with groove (51) is arc-shaped.
5. a kind of explosion anchor pole according to claim 1, it is characterised in that: be equipped with a notch on elastic slice (41).
6. a kind of explosion anchor pole according to claim 1, it is characterised in that: the folder between each limb (12) and blind plate (3)
Angle is arc-shaped.
7. a kind of use the method that explosion anchor pole anchors rock mass described in claim 3, it is characterised in that: including walking as follows
It is rapid:
The first step, according to design requirement to anchorage point measurement and positioning, anchor hole (7) are drilled out in slope surface using drilling machine；
Second step after having cleared up anchor hole (7) interior impurity, anchor pole is put into anchor hole (7), and igniting blasting explosive, so that anchor
Hole (71) are formed under the action of explosion on hole (7) bottom, while under the action of explosion, each piece of limb (12) be bent outwardly,
Mandril (43) pushes snap-gauge (5) to be bent out groove (51) and forms barb, closes baffle (6) at the same time from first through hole (31)
It is blasted；
Slurry is circulated into the body of rod (1) by third step using mashing pump by hollow screw (82), and slurry is passed through along the body of rod (1)
It enters after first through hole (31) in hole (71), is finally discharged by the gap between the body of rod (1) and anchor hole (7), it is solidifying to slurry
After Gu, the anchoring of anchor pole is completed.
8. a kind of method anchored using explosion anchor pole to rock mass according to claim 7, it is characterised in that: carrying out
When to third step, after slurry is discharged by the gap between the body of rod (1) and anchor hole (7), washer (8) and nut (83) be installed to
On empty screw rod (82), the gap between anchor hole (7) and anchor pole is closed using washer (8) and rubber pad (81), is then adopted
Continued to pour into slurry with mashing pump, enter slurry in the subtle gap in hole (71), after slurry solidification, completes anchor pole
Anchoring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810354880.0A CN108533299B (en) | 2018-04-19 | 2018-04-19 | A method of explosion and anchors rock mass anchor pole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810354880.0A CN108533299B (en) | 2018-04-19 | 2018-04-19 | A method of explosion and anchors rock mass anchor pole |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108533299A CN108533299A (en) | 2018-09-14 |
| CN108533299B true CN108533299B (en) | 2019-07-30 |
Family
ID=63478531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810354880.0A Expired - Fee Related CN108533299B (en) | 2018-04-19 | 2018-04-19 | A method of explosion and anchors rock mass anchor pole |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108533299B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1084972A (en) * | 1964-10-26 | 1967-09-27 | Harvey Aluminum Inc | Ground anchor and method of installing same |
| CN2423318Y (en) * | 2000-06-01 | 2001-03-14 | 东北大学 | Explosion expanded rockbolt |
| CN101205719A (en) * | 2007-12-05 | 2008-06-25 | 中国科学院地质与地球物理研究所 | Deep-thick earth-rock aggregate pawl type blasting anchor device |
| CN203239368U (en) * | 2013-05-07 | 2013-10-16 | 山东科技大学 | Hollow slip casting anchor rod adopting blasting reaming technology |
| CN205576908U (en) * | 2016-03-28 | 2016-09-14 | 重庆建工市政交通工程有限责任公司 | Novel anchoring rod |
-
2018
- 2018-04-19 CN CN201810354880.0A patent/CN108533299B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1084972A (en) * | 1964-10-26 | 1967-09-27 | Harvey Aluminum Inc | Ground anchor and method of installing same |
| CN2423318Y (en) * | 2000-06-01 | 2001-03-14 | 东北大学 | Explosion expanded rockbolt |
| CN101205719A (en) * | 2007-12-05 | 2008-06-25 | 中国科学院地质与地球物理研究所 | Deep-thick earth-rock aggregate pawl type blasting anchor device |
| CN203239368U (en) * | 2013-05-07 | 2013-10-16 | 山东科技大学 | Hollow slip casting anchor rod adopting blasting reaming technology |
| CN205576908U (en) * | 2016-03-28 | 2016-09-14 | 重庆建工市政交通工程有限责任公司 | Novel anchoring rod |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108533299A (en) | 2018-09-14 |
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