CN111910626A - Construction process of soil anchor rod - Google Patents
Construction process of soil anchor rod Download PDFInfo
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- CN111910626A CN111910626A CN202010812258.7A CN202010812258A CN111910626A CN 111910626 A CN111910626 A CN 111910626A CN 202010812258 A CN202010812258 A CN 202010812258A CN 111910626 A CN111910626 A CN 111910626A
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- 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
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Abstract
The invention discloses a soil anchor rod construction process, which comprises the following steps: s1, the mechanical equipment and the materials thereof enter a construction site; s2, manufacturing an anchor rod body; s3, positioning anchor holes; s4, drilling and cleaning holes; s5, placing an anchor rod body; s6, primary grouting; the primary perfusion serous fluid is microbial liquid, the microbial liquid consists of bacillus pasteurii S.pasteurii and culture solution, wherein, each 1L of the culture solution contains 5-15g of yeast extract, 2-8g of sodium chloride, 10-30g of urea, 0.3-0.8mg of ferric citrate and 0.4-0.7mg of sodium molybdate, and the pH value of the microbial liquid is adjusted to be 7.5-8; s7, secondary grouting; and S8, three times of grouting. The invention can improve the bonding strength between the hole wall (soil body) of the drilled hole and the grouting body, has strong anchoring force, effectively avoids the occurrence of soil layer anchor rod diseases and improves the construction safety.
Description
Technical Field
The invention relates to a construction process of a soil anchor rod, which is mainly suitable for various water conservancy and hydropower engineering and municipal engineering.
Background
The soil layer anchor rod is an important technology in the modern geotechnical engineering field, is a tension member buried deep in the soil layer, can give full play to the energy of the soil body, call and improve the self-strength and self-stability capability of the soil body, can effectively control the deformation of the soil body and an engineering structure, and ensures the construction safety and the engineering stability.
The soil anchor rod technology is favored by the engineering community by the outstanding advantages of simple structure, safe construction, small disturbance on the slope, small influence on nearby buildings, engineering material saving and the like, is rapidly developed and widely applied in recent years, and almost reaches the engineering construction of slope, foundation pit, mine, tunnel, underground engineering, dam body, navigation channel, reservoir, airport, anti-inclination, anti-floating structure and the like in the geotechnical engineering field.
The anchor rod support is a concealed project, and the properties of soil bodies are complex and changeable, so that the anchor rod project is frequently damaged or even lost, great potential safety hazards are brought to the project construction, and even project interruption, casualties and great economic losses are caused seriously.
CN107386283A discloses an anchor rod construction method suitable for silt sand inclusion layer, includes: s1, anchor rod construction preparation is carried out; s2, when the underground water is lowered below the excavation layer, performing earth excavation; s3, after a groove is dug in the earthwork, measuring elevation and drawing a wire on the fender post to make a mark; s4, performing a high-pressure jet drilling process by adopting a hollow drill rod and a hard alloy high-pressure rotary three-blade drill bit to finish oblique hole guiding; s5, manufacturing an anchor cable by using a steel strand; s6, mounting the manufactured anchor cable on a drill rod, and feeding the drill rod into the guide hole; and S7, when the anchor disc and the drill bit are conveyed into the pilot hole, high-pressure rotary spraying of cement paste is started, the drill rod is pulled out after grouting is completed, and the hole opening is sealed. The invention adopts a high-pressure rotary jet grouting pile process, effectively solves the problem that the anchor cable is difficult to sink after partial pore-forming collapse of a silt sand inclusion layer, but the invention has poor effective reinforcing range by once grouting and the possibility of local slurry leakage, and has no effect if one grouting hole is frequently used for injecting several tons of slurry during construction.
CN102051879A discloses a soil layer anchor rod construction process: a, forming and cleaning holes; b. placing pull rods and geotextile, uniformly arranging a group of centering frames on the pull rods at intervals, wrapping the pull rods and the centering frames into a cylinder by using the geotextile, and feeding the whole body into the bottom of a drilled hole; c. performing primary grouting in a cylindrical cavity surrounded by the geotextile; d. performing secondary grouting between the geotextile and the hole wall; e. and the grouting is performed for three times between the geotextile and the hole wall, so that the invention ensures the reinforcing effect by improving the diameter of the grouting body, avoids slurry leakage and reduces the grouting amount. However, in the grouting process, pure cement slurry with the water cement ratio of 0.5 is selected as slurry, so that the anchoring force is small, and meanwhile, the bonding strength between the hole wall of the drilled hole and the grouting body is not high, and soil layer anchor rod diseases are easily caused.
Disclosure of Invention
In order to solve the technical problems, the invention provides a soil anchor rod construction process, which can improve the bonding strength between the hole wall of a drilled hole and a grouting body, has strong anchoring force, effectively avoids the occurrence of soil anchor rod diseases, and improves the construction safety.
In order to achieve the purpose, the invention provides the following technical scheme:
a soil anchor rod construction process comprises the following steps:
s1, the mechanical equipment and the materials thereof enter a construction site;
s2, manufacturing an anchor rod body;
s3, positioning anchor holes;
s4, drilling and cleaning holes;
s5, placing an anchor rod body;
s6, primary grouting;
the primary perfusion serous fluid is microbial liquid, the microbial liquid consists of bacillus pasteurii S.pasteurii and culture solution, wherein, each 1L of the culture solution contains 5-15g of yeast extract, 2-8g of sodium chloride, 10-30g of urea, 0.3-0.8mg of ferric citrate and 0.4-0.7mg of sodium molybdate, and the pH value of the microbial liquid is adjusted to be 7.5-8;
s7, secondary grouting;
and S8, three times of grouting.
Preferably, the culture solution described in step S6 contains 10g of yeast extract, 6g of sodium chloride, 20g of urea, 0.5mg of ferric citrate, and 0.6mg of sodium molybdate per 1L of culture solution, and the pH of the microbial inoculum is adjusted to 7.8.
Preferably, the slurry for the secondary grouting in step S7 is a cementing solution.
Preferably, the cementing solution consists of calcium acetate, urea and water.
Preferably, the concentration of the calcium acetate in the cementing solution is 10-20g/L, and the concentration of the urea is 10-20/L.
Preferably, the slurry for the third grouting in step S8 is cement mortar.
Preferably, the cement mortar has a mass ratio of cement to sand of 1:1 and a water cement ratio of 0.5.
Preferably, the cement mortar contains 10-20g/L of calcium acetate.
Preferably, the starting time of the secondary grouting in the step S7 is 2-4h after the primary grouting is completed.
Preferably, the starting time of the third grouting in step S8 is 1-3h after the second grouting is completed.
Compared with the prior art, the invention has the beneficial effects that:
according to the soil layer anchor rod construction process, the primary grouting of the microbial liquid, the secondary grouting of the cementing solution and the tertiary grouting of the cement mortar containing the calcium source are adopted, and the microorganisms are utilized to induce the carbonate deposition, so that on one hand, an integral film is formed on the surface of the cement mortar, the anti-seepage performance of the cement mortar can be improved, and the environmental tolerance is increased; on the other hand, in the carbonate deposition process, the bonding strength between the soil body and the grouting body and the bonding strength between the anchor rod and the grouting body are increased, the anchoring force is strong, the occurrence of soil layer anchor rod diseases can be effectively avoided, and the construction safety is improved.
Detailed Description
The embodiments of the present invention are described below in conjunction with specific embodiments, and before the embodiments of the present invention are further described, it is to be understood that the scope of the present invention is not limited to the specific embodiments described below; it is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The sources of the raw materials used in the present invention are not limited, and the raw materials used in the present invention are all those commonly available in the art unless otherwise specified. The soil body of the invention is mucky soil, and the material of the anchor rod body is smooth cold-drawn steel bar with phi of 10 mm; the bacillus pasteurii s.pasteurii is purchased from American Type Culture Collection (ATCC) and is numbered ATCC 11859; the cement is 425 ordinary portland cement; the sand is river sand.
Example 1
A soil anchor rod construction process comprises the following steps:
s1, the mechanical equipment and the materials thereof enter a construction site;
s2, manufacturing an anchor rod body;
s3, positioning anchor holes;
s4, drilling and cleaning holes;
s5, placing an anchor rod body;
s6, primary grouting;
the primary perfusion serous fluid is microbial liquid, the microbial liquid consists of bacillus pasteurii S.pasteurii and culture solution, wherein each 1L of the culture solution contains 5g of yeast extract, 2g of sodium chloride, 10g of urea, 0.3mg of ferric citrate and 0.4mg of sodium molybdate, and the pH value of the microbial liquid is adjusted to be 7.5;
s7, secondary grouting;
the slurry for secondary grouting is a cementing solution, and the cementing solution consists of calcium acetate, urea, cyclodextrin and water, wherein the concentration of the calcium acetate in the cementing solution is 20g/L, and the concentration of the urea in the cementing solution is 10/L;
the starting time of the secondary grouting is 4 hours after the primary grouting is finished;
s8, grouting for the third time;
the slurry for the third grouting is cement mortar, the mass ratio of cement to sand of the cement mortar is 1:1, and the water cement ratio is 0.5; the cement mortar contains 10g/L of calcium acetate;
the starting time of the third grouting is 3 hours after the second grouting is finished.
Example 2
A soil anchor rod construction process comprises the following steps:
s1, the mechanical equipment and the materials thereof enter a construction site;
s2, manufacturing an anchor rod body;
s3, positioning anchor holes;
s4, drilling and cleaning holes;
s5, placing an anchor rod body;
s6, primary grouting;
the primary perfusion serous fluid is microbial liquid, the microbial liquid consists of bacillus pasteurii S.pasteurii and culture solution, wherein each 1L of the culture solution contains 15g of yeast extract, 8g of sodium chloride, 30g of urea, 0.8mg of ferric citrate and 0.7mg of sodium molybdate, and the pH value of the microbial liquid is adjusted to be 8;
s7, secondary grouting;
the slurry for secondary grouting is a cementing solution, and the cementing solution consists of calcium acetate, urea and water, wherein the concentration of the calcium acetate in the cementing solution is 10g/L, and the concentration of the urea in the cementing solution is 20/L;
the starting time of the secondary grouting is 2 hours after the primary grouting is finished;
s8, grouting for the third time;
the slurry for the third grouting is cement mortar, the mass ratio of cement to sand of the cement mortar is 1:1, and the water cement ratio is 0.5; the cement mortar contains 20g/L of calcium acetate;
the starting time of the third grouting is 1h after the second grouting is finished.
Example 3
A soil anchor rod construction process comprises the following steps:
s1, the mechanical equipment and the materials thereof enter a construction site;
s2, manufacturing an anchor rod body;
s3, positioning anchor holes;
s4, drilling and cleaning holes;
s5, placing an anchor rod body;
s6, primary grouting;
the primary perfusion serous fluid is microbial liquid, the microbial liquid consists of bacillus pasteurii S.pasteurii and culture solution, wherein each 1L of the culture solution contains 10g of yeast extract, 6g of sodium chloride, 20g of urea, 0.5mg of ferric citrate and 0.6mg of sodium molybdate, and the pH value of the microbial liquid is adjusted to be 7.8;
s7, secondary grouting;
the slurry for secondary grouting is a cementing solution, and the cementing solution consists of calcium acetate, urea, cyclodextrin and water, wherein the concentration of the calcium acetate in the cementing solution is 15g/L, and the concentration of the urea in the cementing solution is 15/L;
the starting time of the secondary grouting is 3 hours after the primary grouting is finished;
s8, grouting for the third time;
the slurry for the third grouting is cement mortar, the mass ratio of cement to sand of the cement mortar is 1:1, and the water cement ratio is 0.5; the cement mortar contains 12g/L of calcium acetate;
the starting time of the third grouting is 2 hours after the second grouting is finished.
Comparative example 1
This comparative example differs from example 3 in that grouting was carried out using the triple grouting process disclosed in CN 102051879A.
Comparative example 2
This comparative example differs from example 3 in that the culture broth did not contain ferric citrate and sodium molybdate.
Comparative example 3
This comparative example differs from example 3 in that the culture medium contained 0.9mg of ferric citrate and 0.8mg of sodium molybdate.
Comparative example 4
This comparative example differs from example 3 in that the concentration of calcium acetate in the cementing solution was 40g/L and the concentration of urea was 15/L; the cement mortar does not contain calcium acetate.
Comparative example 5
The present comparative example is different from example 3 in that the start time of the secondary grouting in step S7 is 1h after the completion of the primary grouting, and the start time of the tertiary grouting in step S8 is 4h after the completion of the secondary grouting; the calcium acetate in the cement mortar is 25 g/L.
Performance testing
After the soil anchor rod construction processes of the embodiments 1 to 3 and the comparative examples 1 to 5 are completed, maintaining for 20 days, and performing a soil anchor rod drawing test, wherein the magnitude of each loading is 0.1MPa until the anchor rod is broken; the results are shown in Table 1.
TABLE 1
| Ultimate pullout resistance/KN of anchor rod | Bonding strength/KPa between grouting body and soil body | |
| Example 1 | 9.3 | 56 |
| Example 2 | 9.9 | 62 |
| Example 3 | 11.6 | 78 |
| Comparative example 1 | 6.8 | 39 |
| Comparative example 2 | 7.0 | 44 |
| Comparative example 3 | 8.1 | 54 |
| Comparative example 4 | 7.6 | 48 |
| Comparative example 5 | 7.3 | 45 |
As can be seen from the table above, the limit uplift resistance of the soil anchor rod is 9.3-11.6KN, and the bonding strength between the grouting body and the soil body is 56-78KPa, which are higher than those of the comparative example 1. The construction process of the soil layer anchor rod can improve the ultimate uplift resistance of the anchor rod and increase the bonding strength between grouting body and soil body. Meanwhile, according to comparative examples 2-5, the contents of trace elements of iron, molybdenum and calcium acetate in the culture solution and the grouting time have important influences on the improvement of the ultimate withdrawal resistance of the anchor rod and the bonding strength between the grouting body and the soil body.
In conclusion, the soil anchor rod construction process improves the bonding strength between the hole wall of the drilled hole and the grouting body, has strong anchoring force and good environmental tolerance, and simultaneously, the soil anchor rod construction process of the invention adopts primary grouting of microbial liquid, secondary grouting of cementing solution and tertiary grouting of cement mortar containing calcium source, and utilizes microorganisms to induce carbonate deposition, so that on one hand, an integral film is formed on the surface of the cement mortar, the anti-seepage performance of the cement mortar can be improved, and the environmental tolerance is improved; on the other hand, in the carbonate deposition process, the bonding strength between the soil body and the grouting body and the bonding strength between the anchor rod and the grouting body are increased, the anchoring force is strong, the occurrence of soil layer anchor rod diseases can be effectively avoided, and the construction safety is improved.
The present invention has been further described with reference to specific embodiments, which are only exemplary and do not limit the scope of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. The soil anchor rod construction process is characterized by comprising the following steps:
s1, the mechanical equipment and the materials thereof enter a construction site;
s2, manufacturing an anchor rod body;
s3, positioning anchor holes;
s4, drilling and cleaning holes;
s5, placing an anchor rod body;
s6, primary grouting;
the primary perfusion serous fluid is microbial liquid, the microbial liquid consists of bacillus pasteurianus and culture solution, wherein each 1L of the culture solution contains 5-15g of yeast extract, 2-8g of sodium chloride, 10-30g of urea, 0.3-0.8mg of ferric citrate and 0.4-0.7mg of sodium molybdate, and the pH value of the microbial liquid is adjusted to be 7.5-8;
s7, secondary grouting;
and S8, three times of grouting.
2. The soil anchor rod construction process of claim 1, wherein each 1L of the culture solution in the step S6 contains yeast extract 10g, sodium chloride 6g, urea 20g, ferric citrate 0.5mg and sodium molybdate 0.6mg, and the pH value of the microbial solution is adjusted to 7.8.
3. A soil anchor construction process according to claim 1, wherein the slurry of the secondary grouting in step S7 is a cementing solution.
4. A soil anchor construction process according to claim 3, wherein the cementing solution is comprised of calcium acetate, urea and water.
5. A soil anchor rod construction process according to claim 4, wherein the concentration of calcium acetate in the cementing solution is 10-20g/L and the concentration of urea is 10-20/L.
6. A soil anchor construction process according to claim 1, wherein the slurry for the third grouting in step S8 is cement mortar.
7. A soil anchor rod construction process according to claim 6, wherein the cement mortar has a cement to sand mass ratio of 1:1 and a water cement ratio of 0.5.
8. A soil anchor rod construction process according to claim 7, wherein the cement mortar contains 10-20g/L calcium acetate.
9. A soil bolting construction process according to claim 1, wherein the start time of the secondary grouting in step S7 is 2-4h after the completion of the primary grouting.
10. A soil anchor construction process according to claim 1, wherein the start time of the third grouting in step S8 is 1-3 hours after the second grouting is completed.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113463665A (en) * | 2021-07-09 | 2021-10-01 | 福建省地质工程勘察院 | Hillock ecological prevention and control method based on microorganism reinforcement technology |
| CN114135294A (en) * | 2021-08-24 | 2022-03-04 | 重庆大学 | Advanced grouting reinforcement method for red sandstone tunnel |
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| CN114135294A (en) * | 2021-08-24 | 2022-03-04 | 重庆大学 | Advanced grouting reinforcement method for red sandstone tunnel |
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Application publication date: 20201110 |