CN113389201B - Grouting method of efficient anchor rod pressure grouting system - Google Patents
Grouting method of efficient anchor rod pressure grouting system Download PDFInfo
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- CN113389201B CN113389201B CN202110733498.2A CN202110733498A CN113389201B CN 113389201 B CN113389201 B CN 113389201B CN 202110733498 A CN202110733498 A CN 202110733498A CN 113389201 B CN113389201 B CN 113389201B
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- grouting
- pipe
- pressure
- guide pipe
- anchor rod
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000004568 cement Substances 0.000 claims abstract description 49
- 238000005553 drilling Methods 0.000 claims abstract description 20
- 239000011440 grout Substances 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 239000002002 slurry Substances 0.000 claims description 33
- 239000004575 stone Substances 0.000 claims description 9
- 239000000314 lubricant Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000004873 anchoring Methods 0.000 abstract description 8
- 239000002390 adhesive tape Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000002955 isolation Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000007569 slipcasting Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Images
Classifications
-
- 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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- 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
- E02D5/74—Means for anchoring structural elements or bulkheads
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a grouting method of a high-efficiency anchor rod pressure grouting system. The grouting system comprises a grouting pipe, an exhaust pipe, a grouting guide pipe and an opening and closing cover, wherein the side wall of the grouting pipe is provided with a plurality of grouting holes, the bottom of the grouting pipe is an opening end, the bottom of the grouting guide pipe is matched with the opening and closing cover, the grouting guide pipe is inserted into the grouting pipe or pulled out of the grouting pipe, and the grouting method comprises the following steps: drilling at a preset position; arranging an anchor rod and sealing holes; primary grouting; extruding residual cement in the grouting pipe; and (5) secondary high-pressure grouting. According to the invention, through the matching of the grouting guide pipes and the grouting pipes, primary grouting and secondary grouting are completed in the same grouting pipe, the material consumption of grouting of two grouting pipes in the traditional grouting is reduced, and the technical problems that the opening end and the grout outlet at the bottom of the secondary grouting pipe are sealed by using adhesive tapes, the sealing performance is unreliable and the secondary grouting pipe is immersed in grout during primary grouting are solved. In addition, the grouting is sequentially performed from bottom to top, the deep grouting effect is better, the formed grouting body is more reliable, and the anchoring force is stronger.
Description
Technical Field
The invention belongs to the technical field of anchor bolt support, and particularly relates to a grouting method of an efficient anchor bolt pressure grouting system, which is used for grouting backfill soil, loose soil and soft and sticky soil.
Background
In the process of underground engineering, mining engineering, foundation pit and side slope engineering related to geotechnical engineering, one of the main support technologies for reinforcing the stratum in order to prevent deformation, collapse or instability of the stratum is anchor rod grouting. And during grouting, the effective grouting reinforcement of the anchor rod to the soil body is ensured through secondary grouting. In the traditional method, two grouting pipes are used for secondary grouting, and in order to prevent the secondary grouting pipes from being immersed in slurry during primary grouting, the opening ends and slurry outlet holes at the bottoms of the secondary grouting pipes are usually sealed by using adhesive tapes. The method uses two grouting pipes to cause certain waste, the sealing performance of the sealing by the adhesive tape is unreliable, and the effect of preventing the secondary grouting pipe from being immersed in the grout during primary grouting is not ideal in practical application.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a grouting method of an efficient anchor rod pressure grouting system, which is used for conveniently and efficiently grouting, simplifies two grouting pipes into one material-saving pipe and simultaneously prevents the secondary grouting pipe from being immersed in grout during primary grouting.
A grouting method of a high-efficiency anchor rod pressure grouting system comprises a grouting pipe, an exhaust pipe, a grouting guide pipe and an opening and closing cover; the side wall of the grouting pipe is provided with a plurality of grout outlet holes, and the bottom of the grouting pipe is an opening end; the opening and closing cover is matched with the bottom of the grouting guide pipe; the grouting guide pipe is nested and slidably connected with the grouting pipe, and the grouting guide pipe is inserted into the grouting pipe or pulled out of the grouting pipe; the grouting method comprises the following steps:
A. determining the drilling position for drilling and cleaning:
B. the anchor rod is arranged and sealed: binding the grouting pipe, the exhaust pipe and the anchor rod, tightly winding the grouting pipe, the exhaust pipe and the anchor rod by using a woven bag, and inserting the woven bag into the drilled hole, wherein the diameter of the tightly wound woven bag is the same as that of the drilled hole;
C. hole sealing: adopting cement paste to seal the hole at the drilling hole: cement paste is filled at the position, away from the drilling hole, of the top end of the woven bag;
D. primary grouting: opening the opening and closing cover, inserting the grouting guide pipe into the bottom of the grouting pipe in a nested and sliding manner, injecting cement slurry into the grouting guide pipe, slowly pulling out the grouting guide pipe, injecting cement slurry into the grouting pipe from bottom to top, enabling the cement slurry to enter a drilled hole through a slurry outlet hole, and stopping grouting when the cement slurry overflows from the exhaust pipe;
E. extruding residual cement in the grouting pipe: closing the opening and closing cover, smearing a lubricant on the outer surfaces of the grouting guide pipe and the opening and closing cover, inserting the grouting pipe again, extruding all residual cement in the grouting pipe, and keeping the position unchanged for a period of time;
F. secondary high-pressure grouting: when the strength of a cement bonded stone body formed by primary grouting reaches 1.0-3.0 MPa, pulling out the grouting guide pipe, opening the opening and closing cover, inserting the grouting pipe to the bottom again, injecting high-pressure cement slurry into the grouting guide pipe, slowly pulling out the grouting guide pipe, injecting the high-pressure cement slurry into the grouting pipe from bottom to top, and simultaneously, allowing the high-pressure cement slurry to pass through slurry outlet holes in the grouting pipe from bottom to top in sequence, and splitting peripheral cement stones to form high-pressure grouting body.
And B, arranging an isolation frame at intervals of 1.5-2.0 m along the axis direction of the anchor rod, coating oil on the free section of the anchor rod, wrapping the free section of the anchor rod by using a plastic sheath, and sealing the plastic sheath pipe at the intersection of the free section of the anchor rod and the anchoring section and tightly binding the plastic sheath pipe by using an iron wire.
In the step D, the primary grouting pressure is 0.5-1.0MPa, and the pressure is stabilized for 1 minute; and step F, stabilizing the secondary grouting pressure for 5 minutes at 1.0-2.0 MPa.
And in the step B, the distance between the top of the woven bag and the drilling hole is 2.0-3.0m, and the distance between the bottom of the grouting pipe and the bottom of the drilling hole is 150-250 mm.
In the step B, the diameter of the slurry outlet hole is 3-5mm, and the distance is 800-1000 mm.
The opening and closing cover is in threaded connection or rotary connection with the bottom of the grouting guide pipe in a manner of being matched with the bottom of the grouting guide pipe.
In the step B, the blocking length (the length after the woven bag is tightly wound) of the woven bag is 0.8-1.0 m.
And C, injecting cement slurry through a horn-shaped funnel to seal the hole, wherein the blocking length (the distance from the top of the woven bag to the drilling hole) of the cement slurry is 2.0-3.0 m.
In the step A, the aperture of the drilled hole is 100-150 mm; when cleaning the hole, blowing high-pressure air into the elbow steel pipe to blow off stone chips and fine stones in the anchor rod fixing hole; and checking whether the hole depth of the anchor rod fixing hole meets the requirements.
And in the step B, the diameter of the grouting pipe is 12-25 mm, and the grouting pipe and the anchor rod are bound by using adhesive tapes every 1.0-2.0 m.
In step D, F, the slip casting pipe is inserted into the slip casting pipe by first applying lubricant to the surface of the pipe to reduce friction.
And F, forming high-pressure grouting body of the anchoring section, and stopping grouting when the high-pressure cement slurry splits the set cement in the anchoring section.
An iron wire is further arranged outside the woven bag. Therefore, the woven bag is wound with the grouting pipe, the exhaust pipe and the anchor rod more tightly.
One end of the exhaust pipe is arranged outside the hole, and the other end of the exhaust pipe is arranged in the hole and is 4.5-5.0m away from the drilling hole.
The invention has the advantages that the primary grouting and the secondary grouting are completed in the same grouting pipe through the matching of the grouting guide pipe and the grouting pipe, the material consumption of the two grouting pipes for grouting in the prior art is reduced, and the technical problems that the opening end and the grout outlet at the bottom of the secondary grouting pipe are sealed by using adhesive tapes, the sealing performance is unreliable and the secondary grouting pipe is immersed in grout during primary grouting are solved. In addition, the grouting is performed from bottom to top in sequence, the deep grouting effect is better, the formed grouting body is more reliable, and the anchoring force is stronger.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic illustration of the present invention in grouting of an anchor;
FIG. 2 is a schematic view of a grouting pipe inserted into a grouting pipe;
FIG. 3 is a left side view of the grouting pipe inserted into the grouting pipe;
FIG. 4 is a schematic view of a grout pipe;
FIG. 5 is a schematic view of a grouting guide;
fig. 6 is a schematic view of the opening and closing cover.
The names corresponding to the reference numbers in the figures are: 1-grouting pipe; 2-grouting pipe guide; 3-an exhaust pipe; 4-hole sealing cement slurry; 5-weaving a bag; 6-anchor rod; 7-slurry outlet; and 8, opening and closing the cover.
Detailed Description
The present invention and its embodiments are further illustrated by the following description of embodiments thereof, which is to be construed as illustrative and not limiting the present invention to the following embodiments, which are illustrated in the accompanying drawings.
Example 1
A grouting method of a high-efficiency anchor rod pressure grouting system comprises a grouting pipe 1, an exhaust pipe 3, a grouting guide pipe 2 and an opening and closing cover 8, wherein a plurality of grout outlet holes 7 are formed in the full-length section of the side wall of the grouting pipe 1, the diameter of each grout outlet hole 7 is 2-3mm, the distance between the grout outlet holes 7 is 800-1000mm, the bottom of each grout outlet hole is an opening end, and the bottom of each grouting guide pipe 2 is in threaded connection with the opening and closing cover 8; the grouting guide pipe 2 is connected with the grouting pipe 1 in a nested sliding mode, and the grouting guide pipe 2 is inserted into the grouting pipe 1 or pulled out of the grouting pipe 1; as shown in fig. 1-6, the grouting method includes the following steps:
A. determining the drilling position to drill and clean the hole; the hole diameter of the drill hole is 100-1500 mm; when cleaning the hole, the elbow steel pipe is used for introducing high-pressure air to blow off stone chips and fine stones in the anchor rod fixing hole, and whether the hole depth of the anchor rod 6 fixing hole meets the requirements or not is checked.
B. The anchor rod is arranged and sealed: binding the grouting pipe 1, the exhaust pipe 3 and the anchor rod 6 by using an adhesive tape every 1.0-2.0m, wherein the diameter of the grouting pipe 1 is 12-25 mm, tightly winding the grouting pipe 1, the exhaust pipe 3 and the anchor rod 6 by using a woven bag 5, inserting the wound woven bag 5 into a drilled hole, and arranging an iron wire outside the woven bag 5, wherein the diameter of the tightly wound woven bag 5 is the same as the diameter of the drilled hole; the distance between the top end of the woven bag 5 and the drilling hole is 2.0-3.0m, and the distance between the bottom of the grouting pipe 1 and the bottom of the drilling hole is 150-250 mm; the blocking length (the length after the woven bag is tightly wound) of the woven bag 5 is 0.8-1.0 m; one end of the exhaust pipe 3 is arranged outside the hole, the other end of the exhaust pipe is arranged in the hole and is 4.5-5.0m away from the drilling hole, the anchor rod body is a steel strand or a steel bar, and an isolation frame is arranged every 1.5-2.0 m along the axis direction of the anchor rod; the free section of the anchor rod is coated with oil and wrapped by a plastic sheath, and the plastic sheath at the intersection with the anchoring section is sealed in a kiln and tightly bound by an iron wire.
C. Hole sealing: hole sealing cement slurry 4 is adopted for hole sealing at the drilling hole: cement paste is filled in the position, away from the drilling hole, of the top end of the woven bag 5, hole sealing is carried out through grouting of the cement paste through the horn-shaped funnel, and the blocking length (the distance from the top end of the woven bag to the drilling hole) of the hole sealing cement paste 4 is 2.0-3.0 m;
D. primary grouting: opening the opening and closing cover 8, smearing a lubricant on the surface of the grouting guide pipe 2, inserting the grouting guide pipe 2 into the bottom of the grouting pipe 1 in a nested and sliding manner, injecting cement slurry into the grouting guide pipe 2, slowly pulling out the grouting guide pipe 2, injecting the cement slurry into the grouting pipe 1 from bottom to top, enabling the cement slurry to enter a drilled hole through the slurry outlet hole 7, and stopping grouting (performing pressure stabilization before stopping grouting) when the cement slurry overflows from the exhaust pipe 3; the primary grouting pressure is 0.5-1.0MPa, and the pressure is stabilized for 1 minute;
E. extruding residual cement in the grouting pipe: closing the opening and closing cover 8, smearing a layer of lubricating oil on the outer surfaces of the grouting guide pipe 2 and the opening and closing cover, inserting the grouting pipe 1 again, and extruding all residual cement in the grouting pipe 1 out and keeping the position unchanged for a period of time;
F. secondary high-pressure grouting: when the strength of a cement bonded rock body formed by primary grouting reaches 1.0-3.0 MPa, pulling out the grouting guide pipe 2, opening the opening and closing cover 8, smearing a lubricant on the surface of the grouting guide pipe 2, inserting the grouting guide pipe 1 to the bottom again, injecting high-pressure cement slurry into the grouting guide pipe 2, slowly pulling out the grouting guide pipe 2, injecting the high-pressure cement slurry into the grouting guide pipe 1 from bottom to top, simultaneously, allowing the high-pressure cement slurry to pass through the slurry outlet holes 7 in the grouting guide pipe 1 from bottom to top, splitting surrounding cement stones, and stopping grouting (stabilizing pressure before stopping grouting) when the high-pressure cement slurry splits the cement stones in an anchoring section to form high-pressure grouting body of the anchoring section; the secondary grouting pressure is 1.0-2.0 MPa, and the pressure is stabilized for 5 minutes.
Claims (5)
1. The grouting method of the efficient anchor rod pressure grouting system is characterized by comprising the following steps of: the grouting system comprises a grouting pipe (1), an exhaust pipe (3), a grouting guide pipe (2) and an opening and closing cover (8), wherein the side wall of the grouting pipe (1) is provided with a plurality of grout outlet holes, the bottom of the grouting pipe is an opening end, and the opening and closing cover (8) is matched with the bottom of the grouting guide pipe (2); the grouting guide pipe (2) is connected with the grouting pipe (1) in a nested sliding mode, and the grouting guide pipe (2) is inserted into the grouting pipe (1) or pulled out of the grouting pipe (1); the grouting method comprises the following steps:
A. determining the drilling position for drilling and cleaning:
B. the anchor rod is arranged and sealed: binding the grouting pipe (1), the exhaust pipe (3) and the anchor rod (6), tightly winding the grouting pipe (1), the exhaust pipe (3) and the anchor rod (6) by using a woven bag (5), and inserting the wound grouting pipe, the exhaust pipe and the anchor rod (6) into a drilled hole; the diameter of the tightly wound woven bag (5) is the same as the diameter of the drilled hole;
C. hole sealing: adopting cement paste to seal the hole at the drilling hole: cement paste is filled in the distance from the drilling hole to the top end of the woven bag (5);
D. primary grouting: opening the opening and closing cover (8), inserting the grouting guide pipe (2) into the bottom of the grouting pipe (1) in a nested and sliding manner, injecting cement slurry into the grouting guide pipe (2), slowly pulling out the grouting guide pipe (2), injecting cement slurry into the grouting pipe (1) from bottom to top, enabling the cement slurry to enter a drilled hole through the slurry outlet hole (7), and stopping grouting when the cement slurry overflows from the exhaust pipe (3);
E. extruding residual cement in the grouting pipe: closing the opening and closing cover (8), smearing a lubricant on the outer surfaces of the grouting guide pipe (2) and the opening and closing cover (8), inserting the grouting guide pipe into the grouting pipe (1) again, and extruding out all residual cement in the grouting pipe (1) and keeping the position unchanged for a period of time;
F. secondary high-pressure grouting: when the strength of a cement concretion body formed by primary grouting reaches 1.0-3.0 MPa, the grouting guide pipe (2) is pulled out, the opening and closing cover (8) is opened, the grouting guide pipe (2) is inserted into the grouting pipe (1) to the bottom in a nested and sliding manner, high-pressure cement paste is injected into the grouting guide pipe (2), the grouting guide pipe (2) is pulled out slowly, the high-pressure cement paste is injected into the grouting pipe (1) from bottom to top, meanwhile, the high-pressure cement paste penetrates through the paste outlet holes (7) in the grouting pipe (1) from bottom to top in sequence, and surrounding cement stones are split to form high-pressure grouting body.
2. The grouting method of an efficient anchor rod pressure grouting system according to claim 1, characterized in that: in the step D, F, when the grouting guide pipe (2) is inserted into the grouting pipe (1) in a nested and sliding manner, firstly, the surface of the grouting guide pipe (2) is coated with a lubricant.
3. The grouting method of an efficient anchor rod pressure grouting system according to claim 1, characterized in that: in the step D, the primary grouting pressure is 0.5-1.0MPa, and the pressure is stabilized for 1 minute; and step F, stabilizing the secondary grouting pressure for 5 minutes at 1.0-2.0 MPa.
4. The grouting method of an efficient anchor rod pressure grouting system according to claim 1, characterized in that the diameter of the grout outlet holes (7) in step B is 2-3mm, and the distance is 800-1000 mm.
5. A method for grouting in a high-efficiency anchor bolt pressure grouting system according to claim 1, characterized in that the open-close cover (8) is screwed or rotatably connected with the bottom of the grouting pipe (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110733498.2A CN113389201B (en) | 2021-06-30 | 2021-06-30 | Grouting method of efficient anchor rod pressure grouting system |
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| CN202110733498.2A CN113389201B (en) | 2021-06-30 | 2021-06-30 | Grouting method of efficient anchor rod pressure grouting system |
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| Publication Number | Publication Date |
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| CN113389201A CN113389201A (en) | 2021-09-14 |
| CN113389201B true CN113389201B (en) | 2022-06-21 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4360292A (en) * | 1980-05-28 | 1982-11-23 | Keeler Andrew L | Grouted strand anchor and method of making same |
| CN105274994B (en) * | 2015-11-06 | 2017-06-09 | 中煤科工集团西安研究院有限公司 | Anti-suck sludge proof grouting process and grouting device in deep saturated sand |
| CN106089252B (en) * | 2016-08-09 | 2018-10-16 | 北京矿冶研究总院 | Grouting reinforcement method for inhomogeneous loose bodies |
| CN108343065B (en) * | 2017-01-22 | 2023-08-29 | 北京爱地地质勘察基础工程公司 | Compression-resistant connection structure for secondary splitting grouting and construction method |
| CN108411912A (en) * | 2018-05-03 | 2018-08-17 | 大连理工大学 | A kind of convenient method of bolt stress slip casting |
| CN209324391U (en) * | 2018-12-12 | 2019-08-30 | 安徽理工大学 | A kind of bolt grouting bracing means |
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