CN109882223A - The method for carrying out segmenting slip casting using grouting cable anchor - Google Patents
The method for carrying out segmenting slip casting using grouting cable anchor Download PDFInfo
- Publication number
- CN109882223A CN109882223A CN201910253611.XA CN201910253611A CN109882223A CN 109882223 A CN109882223 A CN 109882223A CN 201910253611 A CN201910253611 A CN 201910253611A CN 109882223 A CN109882223 A CN 109882223A
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- slip casting
- grouting
- anchor
- cable body
- cable
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- 238000007569 slipcasting Methods 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000002002 slurry Substances 0.000 claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- 239000011435 rock Substances 0.000 claims abstract description 18
- 230000011218 segmentation Effects 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 abstract description 5
- 239000007924 injection Substances 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 229920002472 Starch Polymers 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000009955 starching Methods 0.000 description 1
Landscapes
- Lining And Supports For Tunnels (AREA)
Abstract
The present invention is in order to solve the problems, such as that existing hollow grouting cable anchor is unable to segmenting slip casting, a kind of method carrying out segmenting slip casting using grouting cable anchor is provided, it is characterized in that, the slip casting core pipe of hollow grouting cable anchor is soft modeling Grouting Pipe, several slurry outlets in upper processing are set in the corresponding segment numerical digit of soft modeling Grouting Pipe, support sleeve is installed, forms pulp gap between steel strand wires, self-sealing stop grouting plug is set to entangle a part of pulp gap, remaining pulp gap is exposed；Slurries can be full of the cavity of self-sealing stop grouting plug one by one first, expand it rapidly, seal the hole wall gap at each slip casting section both ends, several slip casting sections of self-assembling formation, and slurries can uniformly be spread in injection wall-rock crack.
Description
Technical field
The present invention relates to geotechnical engineering support technology more particularly to mining grouting cable anchors.
Background technique
Currently, the difficulty of roadway support and reparation is also continuous during coal production with the increase of coal mining depth
Increase, slip casting becomes a kind of effective means and method for solving current supporting problem.Grouting mode is divided into common slip casting and divides
Section slip casting.Common slip casting is to install Grouting Pipe slip casting inwards, simple process from aperture, but grout mixing is uneven, especially
For the stratum of heterogeneity；Segmenting slip casting can achieve the uniform slip casting effect of range of scatter, compared to the advantage of common slip casting
It is more significant.Current segmenting slip casting method mainly has two kinds of drilling rod retrusive, mini-valve tube retrusive grouting methods.Drilling rod retreats
Formula grouting method uses drilling rod disposal pore-forming, and drilling rod is retreated using drilling rod directly as Grouting Pipe and realizes retrusive segmentation note
Slurry, but the grouting method lacks effective quarantine measures between different slip casting sections, causes slip casting controllability limited, Bu Nengbao
It demonstrate,proves all slurries and enters target slip casting section；In order to overcome the shortcomings of drilling rod retrusive, some uses mini-valve tube retrusive, sleeve
The slip casting of valve pipe retrusive is mainly made of two kinds of Grouting Pipes of slip casting outer tube and slip casting core pipe, and slip casting core pipe both ends, which are provided with, only starches
Plug is segmented using the mobile realization of internal core pipe, slurries enter between two stop grouting plugs by note medium；Since mini-valve tube retreats
Situations such as formula slip casting structure and operational procedure are complex, and component damage easily occurs during extensive mortar depositing construction reduces
Slip casting efficiency.CN109098687 discloses the single stop grouting plug retrusive sublevel grouting device and method of a kind of crack rock, described
Device includes inner tube, outer tube, water injection pipe, expansion type stop grouting plug, interior tube valve, outer tube valve, water filling tube valve, inner tube check valve
With outer tube check valve；The expansion type stop grouting plug is penetrated through and be fixed on outer tube by outer tube, the water injection pipe and expansion
It is connected inside formula stop grouting plug, can be filled the water by water injection pipe into expansion type stop grouting plug expands expansion type stop grouting plug, expansion type
Stop grouting plug water injection pressure is higher than design grouting pressure, guarantees that expansion type stop grouting plug can sustain slurries in the case where designing grouting pressure
The pressure applied to it achievees the purpose that be segmented plug-hole sealing.This artificial recharge segmented seal mode is complicated for operation, construction speed
Slow inefficiency is spent, is not easy to promote the use of.
In addition, tunnel poor for country rock globality at present also uses grouting cable anchor.Grouting cable anchor is by anchor cable body
It is mounted in anchor hole, then to anchor hole middle-high pressure grouting, slurries are entered in country rock gap by anchor hole, breaking surrounding rock are cemented to whole
Body.Grouting cable anchor plays a dual role of slip casting and anchorage cable anchoring.Grouting cable anchor more advanced at present is hollow grouting cable anchor.In
Empty grouting cable anchor is to be spirally wound on the cable body constituted in slip casting core pipe by more steel strand wires, high into anchor hole by slip casting core pipe
Pressure grouting.Using grouting plug in port closing slurries when current hollow grouting cable anchor slip casting, slurries are brought out before slip casting core pipe
It backflows from inside to outside after coming and injects wall-rock crack, common slip casting is similar to, so there are the non-uniform defects of grout mixing.
Current grouting cable anchor structure can't be used for segmenting slip casting, and advantage is not in full use.
Summary of the invention
In order to solve the problems, such as that existing hollow grouting cable anchor is unable to segmenting slip casting, the present invention, which provides, a kind of utilizes grouting cable anchor
The method for carrying out segmenting slip casting.
A method of segmenting slip casting being carried out using grouting cable anchor, as follows:
Grouting equipment is arranged in tunnel first, bores slip casting anchor hole in roadway surrounding rock according to design, then fill into slip casting anchor hole
Enter hollow grouting cable anchor, hollow grouting cable anchor connection grouting equipment is then subjected to slip casting in hole again, wall-rock crack is added
Gu；It is characterized in that, the hollow grouting cable anchor is spirally wound in slip casting core pipe by more steel strand wires constitutes cable body, cable body
Top is equipped with anchorage head, and cable body is anchored to by anchorage head with Anchor Agent the bottom of slip casting anchor hole；The note of hollow grouting cable anchor
Slurry core pipe is soft modeling Grouting Pipe, and cable body rear end welds upper high tensile steel tube and is furnished with lockset, high tensile steel tube and soft modeling Grouting Pipe
Close connection is equipped with external screw thread and hollow hex nut in the external end head of high tensile steel tube, can be realized by hollow hex nut
With the quick connection of slurries conveying tube joint；After cable body is anchored at the bottom of slip casting anchor hole, then in the application of hole external application loading device
Then pretightning force carries cable body with lockset locking；According to the slip casting number of segment of design, processed on the segmentation position of slip casting core pipe
Upper several slurry outlets, install support sleeve between the steel strand wires and slip casting core pipe of pulp hole site, make cable body by support sleeve
It struts to form expansion joint in the position, is opened between the steel strand wires of expansion joint and form pulp gap, and in expansion joint rear sleeve
Self-sealing stop grouting plug, makes self-sealing stop grouting plug entangle the rear portion in pulp gap, and the front in pulp gap is exposed；When slip casting, slurries
It is full of the cavity of self-sealing stop grouting plug one by one first, its expansion is made under grouting pressure, blocks the hole at each slip casting section both ends
Wall gap is divided into several slip casting sections naturally, is diffused into slurries uniformly in wall-rock crack.
The self-sealing stop grouting plug, is the elastic tube that a shape is elliposoidal, and the maximum outside diameter of elastic tube is less than note
Anchor hole diameter is starched, to be smoothly pushed into slip casting anchor hole, the internal diameter of elastic tube is less than cable body diameter, is locked by natural resiliency
On cable body, wherein the lumen middle section of elastic tube is elliposoidal cavity.
Self-sealing stop grouting plug is in the sliding that misplaces in installation process into injected hole in order to prevent, at the expansion joint rear portion of cable body
Positioning ring is fixed on position.
In order to make cable body allow pressure to act in surrouding rock deformation, it is close to palisades position outside the hole of cable body and installs high-strength ball
Shape pallet.
The working principle of the invention and beneficial effect are, after slurries enter slip casting core pipe, flow out from expansion joint, due to portion
Expansion joint is divided to be entangled by self-sealing stop grouting plug, slurries can be full of the cavity of self-sealing stop grouting plug one by one first, under grouting pressure
It expands it rapidly, seals the hole wall gap at each slip casting section both ends, self-assembling formation slip casting section, slurries can uniformly be spread, note
Enter in wall-rock crack；Since self-sealing stop grouting plug shape is elliposoidal, make stop grouting plug that there is certain length, middle section is ellipse
Spherical hollow space has biggish shrink space；Midfeather is thin, is radially generating biggish deformation first under slurry pressure, will
Gap blocking is closely knit, while ensure that reduce from confidential paper during slurry consolidation and lead to spillage, also solve drilling with
Size is difficult to matched problem between stop grouting plug, plays the role of sealing and only starches, and improves stop grouting plug to various different lithologies
The adaptability of drilling achievees the purpose that nature segmenting slip casting.
Detailed description of the invention
Fig. 1 is the schematic diagram of embodiment；Fig. 2 is Fig. 1 partial enlarged view, and display expansion joint self-sealing feelings are become apparent from figure
Condition；Fig. 3 is the structural map of self-sealing stop grouting plug.
Marginal data, the hollow hex nut of 1-, 2- high tensile steel tube, 3- lockset, the high-strength spherical pallet of 4-, 5- positioning ring,
6- support sleeve, 7- self-sealing stop grouting plug, 8- slip casting core pipe, 9- slurry outlet, 10- slip casting anchor hole, 11- country rock, 12- steel strand wires, 13-
Anchorage head, 14- clamp, 15- pulp gap, 16- elliposoidal cavity.
Specific embodiment
As shown in Figure 1, a kind of method for carrying out segmenting slip casting using grouting cable anchor, as follows:
Grouting equipment is arranged in tunnel first, bores slip casting anchor hole 10 in roadway surrounding rock 11 according to design, then to slip casting anchor hole
It is packed into hollow grouting cable anchor in 10, hollow grouting cable anchor connection grouting equipment is then subjected to slip casting in hole again, to wall-rock crack
It is reinforced；Wherein, the hollow grouting cable anchor is spirally wound in slip casting core pipe 8 by more steel strand wires 12 and constitutes cable body,
Cable body top is equipped with anchorage head 13, and cable body is anchored to by anchorage head 13 with Anchor Agent the bottom of slip casting anchor hole 10；Hollow note
The slip casting core pipe 8 for starching anchor cable is soft modeling Grouting Pipe, and cable body rear end welds upper high tensile steel tube 2 and is furnished with lockset 3, high tensile steel tube
2 closely connect with slip casting core pipe 8, and with 14 clamping of clamp；External screw thread and hollow hexagonal are equipped in the external end head of high tensile steel tube 2
Nut 1 can realize the quick connection with slurries conveying tube joint by hollow hex nut 1；Cable body is anchored at slip casting anchor hole 10
Bottom after, then be close to palisades position outside hole and install high-strength spherical pallet 4, apply pretightning force with loading device, then use
The locking of lockset 3 carries cable body.
As shown in Fig. 2, processing upper several slurry outlets on the segmentation position of slip casting core pipe 8 according to the slip casting number of segment of design
9, support sleeve 6 is installed between the steel strand wires 12 and slip casting core pipe 8 of 9 position of slurry outlet, makes cable body in the position by support sleeve 6
It sets and struts to form expansion joint, opened between the steel strand wires of expansion joint and form pulp gap 15, and from close in expansion joint rear sleeve
Stop grouting plug 7 is sealed, so that self-sealing stop grouting plug 7 is entangled the rear portion in pulp gap 15, the front in pulp gap 15 is exposed；When slip casting, slurry
Liquid is full of the cavity 16 of self-sealing stop grouting plug 7 one by one first, expands it rapidly, blocks each slip casting section
The hole wall gap at both ends is divided into several slip casting sections naturally, is diffused into slurries uniformly in wall-rock crack.
As shown in figure 3, the self-sealing stop grouting plug 7, is the elastic tube that a shape is elliposoidal, the maximum of elastic tube
Outer diameter is less than 10 diameter of slip casting anchor hole, and to be smoothly pushed into slip casting anchor hole, the internal diameter of elastic tube is less than cable body diameter, by certainly
Body elasticity is locked on cable body, and wherein the lumen middle section of elastic tube is elliposoidal cavity 16.
Self-sealing stop grouting plug 7 is in the sliding that misplaces into 10 installation process of slip casting anchor hole in order to prevent, in the expansion joint of cable body
Positioning ring 5 is fixed on rear.
Claims (4)
1. a kind of method for carrying out segmenting slip casting using grouting cable anchor, as follows:
Grouting equipment is arranged in tunnel first, bores slip casting anchor hole in roadway surrounding rock according to design, then fill into slip casting anchor hole
Enter hollow grouting cable anchor, hollow grouting cable anchor connection grouting equipment is then subjected to slip casting in hole again, wall-rock crack is added
Gu；It is characterized by:
The hollow grouting cable anchor is spirally wound in slip casting core pipe by more steel strand wires and constitutes cable body, and cable body top is equipped with anchor
Gu cable body is anchored at the bottom of slip casting anchor hole by anchorage head by head with Anchor Agent；The slip casting core pipe of hollow grouting cable anchor is soft
Grouting Pipe is moulded, cable body rear end welds upper high tensile steel tube and is furnished with lockset, and high tensile steel tube is closely connect with soft modeling Grouting Pipe,
The external end head of high tensile steel tube is equipped with external screw thread and hollow hex nut, can be realized and slurries delivery pipe by hollow hex nut
The quick connection of connector；After cable body is anchored at the bottom of slip casting anchor hole, then apply pretightning force outside hole, is then made with lockset locking
Cable body carrying；
According to the slip casting number of segment of design, upper several slurry outlets are processed on the segmentation position of slip casting core pipe, in pulp hole site
Support sleeve is installed between steel strand wires and slip casting core pipe, struts cable body in the position to form expansion joint by support sleeve, is expanded
It is opened between the steel strand wires of section and forms pulp gap, and the self-sealing stop grouting plug in expansion joint rear sleeve, make self-sealing stop grouting plug
The rear portion in pulp gap is entangled, the front in pulp gap is exposed；When slip casting, slurries are full of the sky of self-sealing stop grouting plug one by one first
Chamber makes its expansion under grouting pressure, blocks the hole wall gap at each slip casting section both ends, is divided into several slip casting sections naturally, makes
Slurries are uniformly diffused into wall-rock crack；
The self-sealing stop grouting plug, is the elastic tube that a shape is elliposoidal, and the maximum outside diameter of elastic tube is less than slip casting anchor
The internal diameter of bore dia, elastic tube is less than cable body diameter, is locked on cable body by natural resiliency, wherein among the lumen of elastic tube
Part is elliposoidal cavity.
2. the method for segmenting slip casting as described in claim 1, which is characterized in that be fixed on the expansion joint rear of cable body
Positioning ring (5).
3. the method for segmenting slip casting as described in claim 1, which is characterized in that tight outside the hole of the hollow grouting cable anchor
Patch palisades position is equipped with high-strength spherical pallet (4).
4. the method for segmenting slip casting as described in claim 1, which is characterized in that the high tensile steel tube (2) and soft modeling are infused
Slurry pipe (8) uses clamp (14) clamping after closely connecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910253611.XA CN109882223A (en) | 2019-03-30 | 2019-03-30 | The method for carrying out segmenting slip casting using grouting cable anchor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910253611.XA CN109882223A (en) | 2019-03-30 | 2019-03-30 | The method for carrying out segmenting slip casting using grouting cable anchor |
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| CN109882223A true CN109882223A (en) | 2019-06-14 |
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| CN201910253611.XA Pending CN109882223A (en) | 2019-03-30 | 2019-03-30 | The method for carrying out segmenting slip casting using grouting cable anchor |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110424995A (en) * | 2019-08-06 | 2019-11-08 | 安徽钢铮机电有限公司 | A kind of hollow grouting device and application method of multisection type slip casting |
| CN110513132A (en) * | 2019-09-19 | 2019-11-29 | 新汶矿业集团有限责任公司孙村煤矿 | A kind of pressure sensitive grouting cable anchor and substep grouting construction method |
| CN110608062A (en) * | 2019-10-09 | 2019-12-24 | 中国矿业大学 | Multi-section hollow grouting anchor cable and supporting method |
| CN111074885A (en) * | 2019-12-13 | 2020-04-28 | 济南市市政工程设计研究院（集团）有限责任公司 | Telescopic burr type anchor cable suitable for soft soil and construction method |
| CN111271105A (en) * | 2020-04-01 | 2020-06-12 | 山东科技大学 | Geotechnical engineering sectional type hollow grouting anchor cable and grouting method |
| CN111946375A (en) * | 2020-07-27 | 2020-11-17 | 黄锋 | Sectional type slip casting stock |
| CN112392524A (en) * | 2020-11-16 | 2021-02-23 | 山东科技大学 | Geotechnical engineering sectional type cavity slip casting anchor rope device |
| CN112664251A (en) * | 2020-12-30 | 2021-04-16 | 开滦（集团）有限责任公司 | Hydraulic expansion type grouting anchor rod and anchoring method |
| CN112682080A (en) * | 2021-01-07 | 2021-04-20 | 安徽理工大学 | Piston type graded grouting anchor cable and grouting method |
| CN113356906A (en) * | 2021-06-24 | 2021-09-07 | 中国矿业大学 | Anchoring device and supporting method for fixed-length anchoring and fixed-length grouting of grouting anchor cable |
| CN113417683A (en) * | 2021-08-25 | 2021-09-21 | 徐州振海工程机械有限公司 | Novel slip casting stock |
| CN113882883A (en) * | 2021-09-30 | 2022-01-04 | 中国矿业大学 | Fixed-length anchoring system and method for roadway roof in slow seepage or water spraying state |
| CN114542148A (en) * | 2022-04-24 | 2022-05-27 | 应急管理部国家自然灾害防治研究院 | Grouting support anchor cable equipment for impacting water diversion tunnel by running ice in cold and dry areas |
| CN114592510A (en) * | 2022-03-11 | 2022-06-07 | 深圳市工勘岩土集团有限公司 | Construction method for elastic partition of free section and anchoring section |
| CN114592511A (en) * | 2022-03-11 | 2022-06-07 | 深圳市工勘岩土集团有限公司 | Elastic partition structure for free section and anchoring section |
| CN114657984A (en) * | 2022-04-22 | 2022-06-24 | 东华理工大学 | Segmental grouting anchoring method for joint development high and steep rocky slope |
| WO2023240853A1 (en) * | 2022-07-13 | 2023-12-21 | 中国港湾工程有限责任公司 | Anchor rod and application method therefor |
-
2019
- 2019-03-30 CN CN201910253611.XA patent/CN109882223A/en active Pending
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110424995A (en) * | 2019-08-06 | 2019-11-08 | 安徽钢铮机电有限公司 | A kind of hollow grouting device and application method of multisection type slip casting |
| CN110513132A (en) * | 2019-09-19 | 2019-11-29 | 新汶矿业集团有限责任公司孙村煤矿 | A kind of pressure sensitive grouting cable anchor and substep grouting construction method |
| CN110608062A (en) * | 2019-10-09 | 2019-12-24 | 中国矿业大学 | Multi-section hollow grouting anchor cable and supporting method |
| CN111074885A (en) * | 2019-12-13 | 2020-04-28 | 济南市市政工程设计研究院（集团）有限责任公司 | Telescopic burr type anchor cable suitable for soft soil and construction method |
| CN111074885B (en) * | 2019-12-13 | 2021-08-27 | 济南市市政工程设计研究院（集团）有限责任公司 | Telescopic burr type anchor cable suitable for soft soil and construction method |
| CN111271105A (en) * | 2020-04-01 | 2020-06-12 | 山东科技大学 | Geotechnical engineering sectional type hollow grouting anchor cable and grouting method |
| CN111946375A (en) * | 2020-07-27 | 2020-11-17 | 黄锋 | Sectional type slip casting stock |
| CN112392524A (en) * | 2020-11-16 | 2021-02-23 | 山东科技大学 | Geotechnical engineering sectional type cavity slip casting anchor rope device |
| CN112664251A (en) * | 2020-12-30 | 2021-04-16 | 开滦（集团）有限责任公司 | Hydraulic expansion type grouting anchor rod and anchoring method |
| CN112682080A (en) * | 2021-01-07 | 2021-04-20 | 安徽理工大学 | Piston type graded grouting anchor cable and grouting method |
| CN113356906A (en) * | 2021-06-24 | 2021-09-07 | 中国矿业大学 | Anchoring device and supporting method for fixed-length anchoring and fixed-length grouting of grouting anchor cable |
| CN113417683A (en) * | 2021-08-25 | 2021-09-21 | 徐州振海工程机械有限公司 | Novel slip casting stock |
| CN113882883A (en) * | 2021-09-30 | 2022-01-04 | 中国矿业大学 | Fixed-length anchoring system and method for roadway roof in slow seepage or water spraying state |
| CN114592510A (en) * | 2022-03-11 | 2022-06-07 | 深圳市工勘岩土集团有限公司 | Construction method for elastic partition of free section and anchoring section |
| CN114592511A (en) * | 2022-03-11 | 2022-06-07 | 深圳市工勘岩土集团有限公司 | Elastic partition structure for free section and anchoring section |
| CN114592510B (en) * | 2022-03-11 | 2024-02-20 | 深圳市工勘岩土集团有限公司 | Construction method for elastic partition of free section and anchoring section |
| CN114592511B (en) * | 2022-03-11 | 2024-02-20 | 深圳市工勘岩土集团有限公司 | Elastic partition structure for free section and anchoring section |
| CN114657984A (en) * | 2022-04-22 | 2022-06-24 | 东华理工大学 | Segmental grouting anchoring method for joint development high and steep rocky slope |
| CN114542148A (en) * | 2022-04-24 | 2022-05-27 | 应急管理部国家自然灾害防治研究院 | Grouting support anchor cable equipment for impacting water diversion tunnel by running ice in cold and dry areas |
| CN114542148B (en) * | 2022-04-24 | 2022-07-08 | 应急管理部国家自然灾害防治研究院 | Grouting support anchor cable equipment for impacting water diversion tunnel by flowing ice in cold and dry areas |
| WO2023240853A1 (en) * | 2022-07-13 | 2023-12-21 | 中国港湾工程有限责任公司 | Anchor rod and application method therefor |
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Application publication date: 20190614 |