CN115030187A - Foundation pit supporting method for pipe following construction of steel pipe pile in stone-concrete area - Google Patents
Foundation pit supporting method for pipe following construction of steel pipe pile in stone-concrete area Download PDFInfo
- Publication number
- CN115030187A CN115030187A CN202210851651.6A CN202210851651A CN115030187A CN 115030187 A CN115030187 A CN 115030187A CN 202210851651 A CN202210851651 A CN 202210851651A CN 115030187 A CN115030187 A CN 115030187A
- Authority
- CN
- China
- Prior art keywords
- steel pipe
- pipe pile
- drilling
- drill bit
- casing
- Prior art date
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 60
- 239000010959 steel Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 230000008093 supporting effect Effects 0.000 title claims abstract description 17
- 238000005553 drilling Methods 0.000 claims abstract description 54
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Inorganic materials [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002002 slurry Substances 0.000 claims abstract description 11
- 239000011440 grout Substances 0.000 claims abstract description 10
- 235000010333 potassium nitrate Nutrition 0.000 claims abstract description 7
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims abstract 6
- 239000013589 supplement Substances 0.000 claims 1
- 239000002689 soil Substances 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 4
- 239000011435 rock Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 230000001502 supplementing effect Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/52—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments
- E02D5/523—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments composed of segments
- E02D5/526—Connection means between pile segments
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/62—Compacting the soil at the footing or in or along a casing by forcing cement or like material through tubes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to the technical field of civil construction, in particular to a foundation pit supporting method for following construction of a steel pipe pile in a saltpeter area; the method comprises the following steps: measuring hole sites, positioning a drilling machine, drilling with a pipe, processing a steel pipe pile, sinking the steel pipe pile, grouting and supplementing slurry. The method is characterized in that a grout overflow hole is formed in the steel pipe pile, grout can flow out of the grout overflow hole to surrounding soil bodies along with gradual pulling out of a sleeve when grouting is performed in the steel pipe pile, and the grout can be solidified to reinforce the surrounding soil bodies, so that loose rock and soil layers such as a rock and soil area can be improved, a better supporting effect can be achieved, and influences caused by hole collapse can be reduced; the sleeve is pulled out after being used, so that the material waste is avoided, and the effect of recycling is achieved; and a liner tube is fixed at the joint of the two sections of steel pipe piles, so that the rigidity and the strength of the joint are improved.
Description
Technical Field
The invention relates to the technical field of civil engineering construction, in particular to a foundation pit supporting method for following construction of a steel pipe pile in a stone-concrete area.
Background
Pile anchor support is generally adopted in the current foundation pit support stage in the steel pipe pile following construction, and an anchor rod mainly utilizes the anchoring force of the anchor rod and the ground layer to provide horizontal support tension for a pile arranging system so as to prevent the pile from toppling and sliding with the soil body; however, in loose rock soil such as a rock-nitride area, the method cannot solve the problems in construction, and the steel pipe pile is easy to cause hole collapse in drilling construction, so that the stability of a side slope soil layer is greatly influenced.
Disclosure of Invention
The invention provides a foundation pit supporting method for pipe following construction of a steel pipe pile in a rock-saltpeter area, aiming at the technical problem that hole collapse is easily caused during drilling construction in loose rock-saltpeter areas and the like in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: a foundation pit supporting method for pipe following construction of a steel pipe pile in a saltpeter area comprises the following steps:
determining the hole site; measuring and determining the drilling position of the steel pipe pile;
positioning a drilling machine; installing and debugging a drilling machine on site, installing a drill bit, and placing the drill bit on a drilling position of the steel pipe pile;
drilling construction along the pipe; sequentially sinking a plurality of sections of casing pipes into a hole drilled by a drill bit by a pipe following drilling method, wherein two adjacent sections of casing pipes are fixedly connected;
processing the steel pipe pile; opening a grout overflow hole on the steel pipe pile;
sinking the steel pipe pile; sequentially sinking a plurality of sections of steel pipe piles into the casing, and fixedly connecting two adjacent sections of steel pipe piles;
grouting; grouting into the steel pipe pile and simultaneously gradually pulling out the sleeve.
Preferably, when two adjacent sections of the steel pipe piles are connected, a liner pipe is fixed at the joint.
Preferably, the grouting mode is a pressure grouting method.
Preferably, the method further comprises a step of grouting, specifically, after grouting is completed, grouting is performed into the steel pipe pile when the grout in the steel pipe pile sinks.
Preferably, the method for drilling construction with pipe drilling comprises the following steps: sleeving a first section of sleeve on a drill bit, starting a drilling machine, drilling the drill bit into the ground, sleeving the first section of sleeve on the drill bit, and sinking while drilling; when the drilling depth is close to the length of the first section of casing, stopping drilling, reversely rotating the drill bit, taking out the drill bit from the first section of casing, continuously sleeving a second section of casing on the drill bit, splicing and fixing the second section of casing with the last drilled first section of casing, continuously drilling the drill bit, continuously sinking the second section of casing, and stopping drilling when the drilling depth is close to the length of the second section of casing; and repeating the steps until the drilling depth meets the design requirement.
Preferably, the drill bit is a down-the-hole drill.
Compared with the prior art, the invention has the advantages and positive effects that: (1) the method comprises the following steps that (1) slurry overflow holes are formed in the steel pipe piles, when grouting is carried out in the steel pipe piles, slurry flows out of the slurry overflow holes to surrounding soil bodies along with the gradual pulling-out of sleeves, the slurry is solidified and is reinforced, the soil layer stability of loose rock and soil layers such as a rock-saltpeter area is improved, a better supporting effect is achieved, and meanwhile the influence caused by hole collapse is reduced; (2) the sleeve is pulled out after being used, so that the material waste is avoided, and the effect of recycling is achieved; (3) and a liner tube is fixed at the joint of the two sections of steel pipe piles, so that the rigidity and the strength of the joint are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced,
FIG. 1 is a flow chart of the foundation pit supporting method;
fig. 2 is a schematic connection diagram of the steel pipe pile.
Description of reference numerals:
1-steel pipe pile, 2-grout overflow hole and 3-liner pipe.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments of the present disclosure.
Examples
The invention is further explained with reference to fig. 1-2, and a foundation pit supporting method for rock-saltpeter area steel pipe pile pipe following construction is shown in fig. 1 and 2 and comprises the following steps:
determining the hole site; and measuring and determining the drilling position of the steel pipe pile 1.
Positioning a drilling machine; and (3) installing and debugging the drilling machine on site, installing a drill bit, and placing the drill bit on the drilling position of the steel pipe pile 1, wherein the drill bit is a down-the-hole drill.
Drilling construction with a pipe; sequentially sinking a plurality of sections of casing pipes into a hole drilled by a drill bit by a pipe following drilling method, wherein two adjacent sections of casing pipes are fixedly connected;
the method for drilling construction along the casing comprises the following specific steps: sleeving a first section of sleeve on a drill bit, starting a drilling machine, drilling the drill bit into the ground, sleeving the first section of sleeve on the drill bit, and sinking while drilling; when the drilling depth is close to the length of the first section of casing, stopping drilling, reversely rotating the drill bit, taking out the drill bit from the first section of casing, continuously sleeving a second section of casing on the drill bit, splicing and fixing the second section of casing with the last drilled first section of casing, continuously drilling the drill bit, continuously sinking the second section of casing, and stopping drilling when the drilling depth is close to the length of the second section of casing; and repeating the steps until the drilling depth meets the design requirement.
The down-the-hole hammer of the down-the-hole drill can be thrown away when rotating in the positive direction, so that a hole which is larger than the diameter of the down-the-hole hammer and has the same size as the outer diameter of the sleeve can be drilled, and the sleeve outside the drill bit just sinks along with the down-the-hole hammer; when the reverse rotation, the down-the-hole hammer that throws away contracts, just is less than sheathed tube internal diameter, makes things convenient for the drill bit to take out, and the mode pore-forming through the pipe-following is applicable to difficult pore-forming and unstable and needs the drilling to carry out the geology of strutting.
Processing a steel pipe pile 1; opening a grout overflow hole 2 on the steel pipe pile 1; when the grout is poured into the steel pipe pile 1, along with the gradual extraction of sleeve pipe, the thick liquid can flow out to soil body around from excessive thick liquid hole 2, treats that the thick liquid solidifies, equals to consolidate soil body around, has the effect that improves soil layer stability to loose ground layers such as stone nitre district, plays better supporting effect, reduces the influence that the hole caused of collapsing simultaneously.
Sinking the steel pipe pile 1; sequentially sinking a plurality of sections of steel pipe piles 1 into the casing pipe, and fixedly connecting two adjacent sections of steel pipe piles 1; when two adjacent sections of steel pipe piles 1 are connected, a liner pipe 3 is fixed at the joint; the rigidity and the strength of the joint are increased.
Grouting; grouting into the steel pipe pile 1 in a pressure grouting mode, and gradually pulling out the sleeve; the sleeve is pulled out after being used, so that the material waste is avoided, and the effect of recycling is achieved.
Pulp replenishing; after grouting is finished, grouting into the steel pipe pile 1 when the slurry in the steel pipe pile 1 sinks; because the slurry can slowly permeate into the soil body, the height of the slurry in the steel pipe pile 1 can be reduced in the period of time, and the slurry is timely supplemented to reach the designed elevation.
While the invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention.
Claims (6)
1. A foundation pit supporting method for pipe following construction of a steel pipe pile in a saltpeter area is characterized by comprising the following steps:
determining the hole site; measuring and determining the drilling position of the steel pipe pile (1);
positioning a drilling machine; installing and debugging a drilling machine on site, installing a drill bit, and placing the drill bit on the drilling position of the steel pipe pile (1);
drilling construction with a pipe; sequentially sinking a plurality of sections of casing pipes into a hole drilled by a drill bit by a pipe following drilling method, wherein two adjacent sections of casing pipes are fixedly connected;
processing a steel pipe pile (1); opening a grout overflow hole (2) on the steel pipe pile (1);
sinking the steel pipe pile (1); sequentially sinking a plurality of sections of steel pipe piles (1) into the casing pipe, and fixedly connecting two adjacent sections of steel pipe piles (1);
grouting; grouting into the steel pipe pile (1) and simultaneously gradually pulling out the sleeve.
2. The foundation pit supporting method for the pipe following construction of the steel pipe pile in the saltpeter area according to claim 1, wherein when two adjacent sections of the steel pipe pile (1) are connected, a liner pipe (3) is fixed at the joint.
3. The foundation pit supporting method for pipe following construction of the steel pipe pile in the stone-concrete area according to claim 1, wherein the grouting mode is a pressure grouting method.
4. The foundation pit supporting method for pipe following construction of the steel pipe pile in the saltpeter region according to claim 3, characterized by further comprising a step of slurry supplement, specifically, grouting into the steel pipe pile (1) when slurry in the steel pipe pile (1) sinks after grouting is completed.
5. The foundation pit supporting method for pipe following construction of the steel pipe pile in the saltpeter area according to claim 1, which is characterized in that the pipe following drilling construction method specifically comprises the following steps: sleeving a first section of sleeve on a drill bit, starting a drilling machine, drilling the drill bit into the ground, sleeving the first section of sleeve on the drill bit, and sinking while drilling; when the drilling depth is close to the length of the first section of casing, stopping drilling, reversely rotating the drill bit, taking the drill bit out of the first section of casing, continuously sleeving a second section of casing on the drill bit, splicing and fixing the second section of casing with the last drilled first section of casing, continuously drilling the drill bit, continuously sinking the second section of casing, and stopping drilling when the drilling depth is close to the length of the second section of casing; and repeating the steps until the drilling depth reaches the design requirement.
6. The foundation pit supporting method for the pipe following construction of the steel pipe pile in the saltpeter region according to claim 5, wherein the drill bit is a down-the-hole drill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210851651.6A CN115030187A (en) | 2022-07-20 | 2022-07-20 | Foundation pit supporting method for pipe following construction of steel pipe pile in stone-concrete area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210851651.6A CN115030187A (en) | 2022-07-20 | 2022-07-20 | Foundation pit supporting method for pipe following construction of steel pipe pile in stone-concrete area |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115030187A true CN115030187A (en) | 2022-09-09 |
Family
ID=83129450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210851651.6A Pending CN115030187A (en) | 2022-07-20 | 2022-07-20 | Foundation pit supporting method for pipe following construction of steel pipe pile in stone-concrete area |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115030187A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020068981A (en) * | 2002-06-28 | 2002-08-28 | 지앤에스건설 주식회사 | steal pipe micro-pile and grouting installing method |
| CN102943466A (en) * | 2012-11-14 | 2013-02-27 | 中铁十二局集团有限公司 | Construction method for miniature steel pipe concrete pile to penetrate through roadbed layer for reinforcing soft foundation construction |
| CN108517877A (en) * | 2018-04-24 | 2018-09-11 | 青岛新华友建工集团股份有限公司 | Miscellaneous fill ultra-deep foundation pit consolidates slip casting combination double-row steel pipe stake supporting construction method |
| CN109137894A (en) * | 2018-09-14 | 2019-01-04 | 广东省建筑科学研究院集团股份有限公司 | A kind of bored grouting steel pipe pile construction method to be followed up using casing overall length |
| CN111472346A (en) * | 2020-04-30 | 2020-07-31 | 中国二十二冶集团有限公司 | Construction method for reinforcing soil around pile body of cast-in-place pile |
| CN111501781A (en) * | 2020-05-19 | 2020-08-07 | 青岛海川建设集团有限公司 | Supporting method and structure combining consolidation grouting of hybrid filling ultra-deep foundation pit with double rows of steel pipe piles |
-
2022
- 2022-07-20 CN CN202210851651.6A patent/CN115030187A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020068981A (en) * | 2002-06-28 | 2002-08-28 | 지앤에스건설 주식회사 | steal pipe micro-pile and grouting installing method |
| CN102943466A (en) * | 2012-11-14 | 2013-02-27 | 中铁十二局集团有限公司 | Construction method for miniature steel pipe concrete pile to penetrate through roadbed layer for reinforcing soft foundation construction |
| CN108517877A (en) * | 2018-04-24 | 2018-09-11 | 青岛新华友建工集团股份有限公司 | Miscellaneous fill ultra-deep foundation pit consolidates slip casting combination double-row steel pipe stake supporting construction method |
| CN109137894A (en) * | 2018-09-14 | 2019-01-04 | 广东省建筑科学研究院集团股份有限公司 | A kind of bored grouting steel pipe pile construction method to be followed up using casing overall length |
| CN111472346A (en) * | 2020-04-30 | 2020-07-31 | 中国二十二冶集团有限公司 | Construction method for reinforcing soil around pile body of cast-in-place pile |
| CN111501781A (en) * | 2020-05-19 | 2020-08-07 | 青岛海川建设集团有限公司 | Supporting method and structure combining consolidation grouting of hybrid filling ultra-deep foundation pit with double rows of steel pipe piles |
Non-Patent Citations (2)
| Title |
|---|
| 吴昌期: "《预应力混凝土梁桥施工》", 31 July 1981, 人民交通出版社, pages: 73 * |
| 王仙美: "《平原地区船闸工程设计与创新》", 31 July 2021, 河海大学出版社, pages: 215 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2018210019A1 (en) | Pile formation method for down-the-hole impact rotary jet composite piles | |
| US20140026518A1 (en) | Construction method for root-type foundation anchorage and bored, root-type cast in-situ pile with anchor bolts | |
| CN101748728B (en) | Soil cement expanding uplift pile | |
| CN109024651B (en) | Steel pipe concrete mixed pile foundation and construction method | |
| CN101812843B (en) | Centre grouted poured post-grouting pile construction methods, and grouter and grout injector used thereby | |
| JP2010031647A (en) | Internal excavation method through pile, and foundation pile structure | |
| CN101328712A (en) | Construction method of interlocking pile for soft soil and soil layer with obstacle | |
| CN105569560A (en) | Full casing long-spiral bored pile machine and method of using same for construction | |
| CN110735600B (en) | Mechanical pore-forming pile construction process for karst geology | |
| CN103510510A (en) | Reinforced long spiral drilling concrete grouting pile and construction method thereof | |
| CN105649073A (en) | Static root drilling type construction method for planting piles | |
| JP2019019633A (en) | Construction method of continuous underground wall and steel pipe pile | |
| CN103911993B (en) | A kind of PHA anchor pole and construction method thereof | |
| CN104314076A (en) | Recycled type prestressed anchor cable structure for soft soil foundation and construction method | |
| CN206428707U (en) | A kind of integrated pile tube dado structure of pattern foundation pit supporting structure precipitation | |
| CN101793027B (en) | Core-grouted static pressure anchor rod pile | |
| CN110777775A (en) | Foundation pit structure and construction method thereof | |
| CN214245694U (en) | Pile forming system for large-diameter cast-in-situ bored pile in karst area | |
| CN203594023U (en) | Enhanced type long auger drilling pressure-grouting concrete pile | |
| CN101161947A (en) | Integration method of lagging pile and dewatering well for foundation ditch support | |
| CN105672329B (en) | The large size prefabricated building enclosure of deep basal pit and construction method | |
| CN109681212B (en) | Excavation construction method of small-section loess tunnel | |
| CN115030187A (en) | Foundation pit supporting method for pipe following construction of steel pipe pile in stone-concrete area | |
| CN102296597A (en) | Construction method of steel pipe piles in shallow soil layer | |
| CN113931179A (en) | Anchor cable pore-forming and grouting construction method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |