CN115897528B - Urease reinforcement-based detection method - Google Patents
Urease reinforcement-based detection method Download PDFInfo
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- CN115897528B CN115897528B CN202211427031.6A CN202211427031A CN115897528B CN 115897528 B CN115897528 B CN 115897528B CN 202211427031 A CN202211427031 A CN 202211427031A CN 115897528 B CN115897528 B CN 115897528B
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- reinforcement
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- 238000001514 detection method Methods 0.000 title claims abstract description 66
- 230000002787 reinforcement Effects 0.000 title claims abstract description 54
- 108010046334 Urease Proteins 0.000 title claims abstract description 31
- 239000002689 soil Substances 0.000 claims abstract description 39
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 26
- 238000005516 engineering process Methods 0.000 claims abstract description 19
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 16
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 13
- -1 ammonium ions Chemical class 0.000 claims abstract description 12
- 101000965313 Legionella pneumophila subsp. pneumophila (strain Philadelphia 1 / ATCC 33152 / DSM 7513) Aconitate hydratase A Proteins 0.000 claims abstract description 10
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 7
- 239000013078 crystal Substances 0.000 claims abstract description 4
- 230000001681 protective effect Effects 0.000 claims description 17
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 8
- 235000019270 ammonium chloride Nutrition 0.000 claims description 6
- 230000007062 hydrolysis Effects 0.000 claims description 6
- 238000006460 hydrolysis reaction Methods 0.000 claims description 6
- 150000002500 ions Chemical class 0.000 claims description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 5
- 239000001110 calcium chloride Substances 0.000 claims description 5
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 3
- 239000001099 ammonium carbonate Substances 0.000 claims description 3
- 235000012501 ammonium carbonate Nutrition 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 239000004202 carbamide Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005553 drilling Methods 0.000 description 5
- 238000007596 consolidation process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 241000193830 Bacillus <bacterium> Species 0.000 description 1
- 235000010469 Glycine max Nutrition 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- 241000606860 Pasteurella Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention belongs to the technical field of roadbed treatment, and particularly relates to a detection method based on urease reinforcement, which comprises the following steps of firstly preparing a urease reinforcement detection device and measuring the pH value of unreinforced alkaline soil, secondly, performing reinforcement treatment on a roadbed by adopting a MICP technology or EICP technology on an undisturbed soil area in the first step to form a reinforced roadbed, and thirdly, driving the urease reinforcement detection device in the first step to the second step, and detecting the pH value of the soil in the reinforced roadbed: PH After reinforcement , calculating the concentration of ammonium ions through a formula, and in the fourth step, judging the reinforcing effect according to the concentration of ammonium ions calculated in the third step, wherein the judging method is that the larger the concentration of ammonium ions is, the more calcium carbonate crystals can be produced, and the better the reinforcing effect is; the lower the ammonium ion concentration, the less carbonate ions can be used to form calcium carbonate, tending to unreinforced areas, thereby determining reinforced sites. The method of the invention is easy to detect the reinforcement range after the roadbed is reinforced by MICP technology or EICP technology and quick to detect.
Description
Technical Field
The invention belongs to the technical field of roadbed treatment, and provides a detection method based on urease reinforcement.
Background
In the road subgrade construction process, because roadbed filler structures in a natural state are loose, and certain sections have soft soil foundations, so that the problems of uneven sedimentation, sedimentation instability and other diseases are caused, the driving safety is affected, the service life of a road is reduced, and a large amount of manpower and funds can be consumed on road maintenance every year.
At present, cement is mostly adopted for reinforcing the soft soil roadbed, but the cement needs higher energy in the production process and can cause huge pollution. MICP (Bacillus Pasteurella-induced calcium carbonate precipitation) technology and EICP (soybean urease-induced calcium carbonate precipitation) technology are increasingly popular as an effective, economical and green reinforcement mode, but how to determine the reinforcement range of the technology to roadbed is a problem to be solved.
Disclosure of Invention
In view of the above, the present invention aims to provide a urease-reinforced detection method which is easy to detect the roadbed reinforcement range and detection.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The invention provides a detection method based on urease reinforcement, which is characterized by comprising the following steps of: comprises the following steps of the method,
Firstly, preparing a urease reinforcement detection device, wherein the pH value of undisturbed alkaline soil is A when the urease reinforcement detection device is used for detecting unreinforced, the concentration of hydroxyl ions in the soil is C (OH -)＝10A-14, and then the urease reinforcement detection device is driven away;
and a second step of finishing the reinforcement treatment of the roadbed by adopting MICP technology or EICP technology in the undisturbed soil area in the first step, wherein in the roadbed under reinforcement,
The urea reacts under the action of urease to generate ammonium ions and carbonate ions, and the chemical reaction equation is that
Subsequently, the generated ammonium carbonate reacts with an added calcium source (calcium chloride) with a chemical reaction equation of
(NH4)2CO3+CaCl2→CaCO3↓+2NH4Cl；
The ionization equilibrium constant of ammonia water at t ℃ is K b, and the hydrolysis equilibrium constant of ammonium chloride can be obtained(K w is the ion product constant of water, K w＝10-14 at 25 ℃), and the concentration of H + ions in the soil after ammonium chloride hydrolysis is further known to be:
the reinforced roadbed is formed after the reaction,
Third, the urease reinforcement detecting device in the first step is driven to the condition that the PH of the detected soil in the reinforced roadbed in the second step is at the PH After reinforcement , and the PH After reinforcement is at the same time
The ammonium ion concentration of the detection point in the reinforced roadbed can be calculated by the formula:
Fourth, judging the reinforcing effect according to the ammonium ion concentration calculated in the third step, wherein the judging method is that the larger the ammonium ion concentration is, the more calcium carbonate crystals can be produced, and the better the reinforcing effect is; the lower the ammonium ion concentration, the less carbonate ions can be used to form calcium carbonate, tending to unreinforced areas, thereby determining reinforced sites.
In order to ensure that the accuracy of detection does not destroy the soil structure after reinforcement, further, in the scheme, the method comprises the following steps: the pH detection in the post-consolidation subgrade should be performed before the surface hardening and caking of the post-consolidation subgrade.
In order to improve the detection precision, further, in the above scheme: the determination of the detection pH in the roadbed after reinforcement is carried out three times of measurement at the top point, the middle point and the bottom point of the reinforcement depth according to the reinforcement depth, and the concentration of ammonium ions at the detected point is calculated respectively.
In order to facilitate detection, further, in the above scheme: the urease reinforcement detection device comprises a movable trolley, a hydraulic source and a hydraulic cylinder a, wherein the hydraulic source and the hydraulic cylinder a are positioned on the movable trolley, the hydraulic cylinder a is communicated with the hydraulic source through a pipeline, a pH detection mechanism is fixed at the end part of a piston rod a of the hydraulic cylinder a, the pH detection mechanism further comprises a protective shell, a hydraulic cylinder b is positioned at the top end of the protective shell and is communicated with the hydraulic source through a pipeline, a driving motor is fixed at the end part of a piston rod b of the hydraulic cylinder b, the driving motor is positioned in an inner cavity of the protective shell, and a drill rod is fixed on a power output shaft of the driving motor;
a detection tube is fixed on the outer wall of the cylinder body of the hydraulic cylinder b and/or the outer wall of the protective shell, a hydraulic cylinder c is fixed at the top end of the detection tube, a soil pH meter is fixed at the end part of a piston rod c of the hydraulic cylinder c, and the soil pH meter is positioned in the inner cavity of the detection tube.
In order to protect the soil pH meter in the detection tube from being accidentally damaged during drilling, further, in the scheme: the lower port of the detection tube is higher than the lower port of the protective shell.
The beneficial effects of the invention are as follows:
1. The method overcomes the defect that the reinforcement range is difficult to determine when the MICP technology and EICP technology are adopted to process the roadbed, and provides a simple, reliable and convenient determination method for determining the reinforcement range by using the MICP technology and EICP technology.
2. Soil, urease liquid and gel liquid can be fully mixed for the reinforced roadbed area through the arranged drill rods, so that the roadbed treatment effect is enhanced; for the unreinforced area, the soil body is stirred, and the test rod is more convenient to descend.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of the structure of the pH detecting mechanism of the present invention;
Reference numerals: 1. a movable trolley; 2. a hydraulic source; 3. a hydraulic cylinder a; 4. a piston rod a; 5. a pH detection mechanism; 6. A hydraulic cylinder b; 7. a piston rod b; 8. a driving motor; 9. a protective shell; 10. a drill rod; 11. a detection tube; 12. a hydraulic cylinder c; 13. a piston rod c; 14. soil pH meter.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
As shown in fig. 1-2, the urease reinforcement-based detection method of the invention is characterized in that: comprises the following steps of the method,
Firstly, preparing a urease reinforcement detection device, wherein the pH value of undisturbed alkaline soil is A when the urease reinforcement detection device is not reinforced, the concentration of hydroxyl ions in the soil is C (OH -)＝10A-14, and then driving the urease reinforcement detection device away;
and a second step of finishing the reinforcement treatment of the roadbed by adopting MICP technology or EICP technology in the undisturbed soil area in the first step, wherein in the roadbed under reinforcement,
The urea reacts under the action of urease to generate ammonium ions and carbonate ions, and the chemical reaction equation is that
Subsequently, the generated ammonium carbonate reacts with an added calcium source (calcium chloride) with a chemical reaction equation of
(NH4)2CO3+CaCl2→CaCO3↓+2NH4Cl；
The ionization equilibrium constant of ammonia water at t ℃ is K b, and the hydrolysis equilibrium constant of ammonium chloride can be obtained(K w is the ion product constant of water, K w＝10-14 at 25 ℃), and the concentration of H + ions in the soil after ammonium chloride hydrolysis is further known to be:
the reinforced roadbed is formed after the reaction,
Third, the urease reinforcement detecting device in the first step is driven to the condition that the PH of the detected soil in the reinforced roadbed in the second step is at the PH After reinforcement , and the PH After reinforcement is at the same time
The ammonium ion concentration of the detection point in the reinforced roadbed is calculated by the formula
Fourth, judging the reinforcing effect according to the ammonium ion concentration calculated in the third step, wherein the judging method is that the larger the ammonium ion concentration is, the more calcium carbonate crystals can be produced, and the better the reinforcing effect is; the lower the ammonium ion concentration, the less carbonate ions can be used to form calcium carbonate, tending to unreinforced areas, thereby determining reinforced sites. The method is suitable for roadbed detection in MICP/EICP in-situ pouring reinforcement mode.
In order to ensure that the accuracy of detection does not damage the reinforced soil structure, further, in the scheme: the pH detection in the post-consolidation subgrade should be performed before the surface hardening and caking of the post-consolidation subgrade.
In order to improve the detection accuracy, in the above embodiment, it is preferable that: the determination of the detection pH in the roadbed after reinforcement is carried out three times of measurement at the top point, the middle point and the bottom point of the reinforcement depth according to the reinforcement depth, and the concentration of ammonium ions at the detected point is calculated respectively.
For ease of detection, in the above embodiment, it is preferable that: the urease reinforcement detection device comprises a movable trolley 1, a hydraulic source 2 and a hydraulic cylinder a3, wherein the hydraulic source 2 and the hydraulic cylinder a3 are positioned on the movable trolley 1, the hydraulic cylinder a3 is communicated with the hydraulic source 2 through a pipeline, a pH detection mechanism 5 is fixed at the end part of a piston rod a4 of the hydraulic cylinder a3, the pH detection mechanism 5 comprises a protective shell 9, a hydraulic cylinder b6 positioned at the top end of the protective shell 9, the hydraulic cylinder b6 is communicated with the hydraulic source 2 through a pipeline, a driving motor 8 is fixed at the end part of a piston rod b7 of the hydraulic cylinder b6, the driving motor 8 is positioned in an inner cavity of the protective shell 9, and a drill rod 10 is fixed on a power output shaft of the driving motor 8;
a detection tube 11 is fixed on the outer wall of the cylinder body of the hydraulic cylinder b6 and/or the outer wall of the protective shell 9, a hydraulic cylinder c12 is fixed on the top end of the detection tube 11, a soil pH meter 14 is fixed on the end part of a piston rod c13 of the hydraulic cylinder c12, and the soil pH meter 14 is positioned in the inner cavity of the detection tube 11.
To protect the soil pH meter 14 inside the detection tube 11 from accidental damage during drilling, in the above embodiment, it is preferable that: the lower port of the detection tube 11 is higher than the lower port of the protective shell 9.
The working process of the urease reinforcing detection device is that the pH value of undisturbed soil is firstly detected when the urease reinforcing detection device is not reinforced, and after the roadbed is reinforced by adopting the MICP technology or EICP technology, an operator drives the movable trolley 1 to the roadbed area after the reinforcement treatment. After the whole device is driven to the vicinity of a certain strengthening center of the roadbed area after strengthening treatment, an operator starts a hydraulic cylinder a to work, the lower port of the protective shell is tightly abutted to the detected area, a drill rod is perpendicular to soil, a driving motor 8 is started to rotate clockwise, then, the operator starts the hydraulic cylinder b to work, the drill rod 10 performs drilling operation in the detected area through the combined movement of the hydraulic cylinder b and the driving motor 8, when the drill rod 11 advances to the strengthening depth, the driving motor 8 rotates the drill rod 11 anticlockwise, and the drilled detection hole is upwards proposed under the action of the hydraulic cylinder b. Subsequently, the operator operates the movable cart 1 so that the test tube can be vertically placed into the test hole. The soil pH meter 14 was gradually pressed into the detection hole by the upper hydraulic cylinder c, and the soil pH values at the hole opening, the half reinforcement depth and the three hole bottoms of the detection hole were measured by the soil pH meter 14. By the formulaThe ammonium ion concentration is calculated, if the ammonium ion concentration calculated according to the pH values of the upper, middle and lower (orifice, half of the reinforcing depth and bottom of the hole) points of the detection hole is larger, the reinforcing effect is better, and the drilling detection distance should be properly increased; if there is a little difference between the pH value of the three points above, in the middle and below (orifice, half of the reinforcing depth, bottom of the orifice) and the original soil, and the calculated concentration of ammonium ions is smaller, it indicates that the reinforcing range is uneven at the drilling position, and the detecting hole is located at the edge of the reinforcing range. Therefore, the in-situ grouting arrangement mode of the whole construction area can be determined by the reinforced boundary, the construction process is optimized, and the roadbed treatment quality is improved.
In the above embodiment, all the components are commercially available products.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (1)
1. A detection method based on urease reinforcement is characterized in that: comprises the following steps of the method,
Firstly, preparing a urease reinforcement detection device, wherein the pH value of undisturbed alkaline soil is A when the urease reinforcement detection device is used for detecting unreinforced, the concentration of hydroxyl ions in the soil is C (OH -)＝10A-14, and then the urease reinforcement detection device is driven away;
and a second step of finishing the reinforcement treatment of the roadbed by adopting MICP technology or EICP technology in the undisturbed soil area in the first step, wherein in the roadbed under reinforcement,
The urea reacts under the action of urease to generate ammonium ions and carbonate ions, and the chemical reaction equation is that
Subsequently, the ammonium carbonate produced is reacted with added calcium chloride, the chemical reaction equation of which
Is (NH 4)2CO3+CaCl2——→CaCO3↓+2NH4 Cl;
The ionization equilibrium constant of ammonia water at t ℃ is K b, and the hydrolysis equilibrium constant of ammonium chloride can be obtained (K w is the ion product constant of water, K w＝10-14 at 25 ℃), and the ion concentration of H + in the soil after ammonium chloride hydrolysis is: /(I)
The reinforced roadbed is formed after the reaction,
Third, the urease reinforcement detecting device in the first step is driven to the condition that the PH of the detected soil in the reinforced roadbed in the second step is at the PH After reinforcement , and the PH After reinforcement is at the same time
The ammonium ion concentration of the detection point in the reinforced roadbed can be calculated by the formula:
Fourth, judging the reinforcing effect according to the ammonium ion concentration calculated in the third step, wherein the judging method is that the larger the ammonium ion concentration is, the more calcium carbonate crystals can be produced, and the better the reinforcing effect is; the lower the ammonium ion concentration, the fewer carbonate ions that can be used to form calcium carbonate, tending to unreinforced areas, thereby determining reinforced locations;
Detecting the pH value in the reinforced roadbed before hardening and agglomerating the surface of the reinforced roadbed;
measuring the pH value in the reinforced roadbed according to the reinforced depth, and measuring three times at the top point, the middle point and the bottom point of the reinforced depth to respectively calculate the ammonium ion concentration of the detected point;
The urease reinforcement detection device comprises a movable trolley (1), a hydraulic source (2) and a hydraulic cylinder a (3) which are positioned on the movable trolley (1), wherein the hydraulic cylinder a (3) is communicated with the hydraulic source (2) through a pipeline, a pH detection mechanism (5) is fixed at the end part of a piston rod a (4) of the hydraulic cylinder a (3), the pH detection mechanism (5) further comprises a protective shell (9), a hydraulic cylinder b (6) which is positioned at the top end of the protective shell (9), the hydraulic cylinder b (6) is communicated with the hydraulic source (2) through a pipeline, a driving motor (8) is fixed at the end part of a piston rod b (7) of the hydraulic cylinder b (6), the driving motor (8) is positioned in an inner cavity of the protective shell (9), and a drill rod (10) is fixed on a power output shaft of the driving motor (8);
a detection tube (11) is fixed on the outer wall of the cylinder body of the hydraulic cylinder b (6) and/or the outer wall of the protective shell (9), a hydraulic cylinder c (12) is fixed at the top end of the detection tube (11), a soil pH meter (14) is fixed at the end part of a piston rod c (13) of the hydraulic cylinder c (12), and the soil pH meter (14) is positioned in the inner cavity of the detection tube (11);
The lower port of the detection tube (11) is higher than the lower port of the protective shell (9).
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003048382A1 (en) * | 2001-12-03 | 2003-06-12 | Sievers Instruments, Inc. | Sensitive detection of urea and related compounds in water |
| CN109723057A (en) * | 2018-12-29 | 2019-05-07 | 青岛理工大学 | Soil body reinforcing method for double-high-pressure stirring and spraying construction |
| CN112877073A (en) * | 2020-12-31 | 2021-06-01 | 河海大学 | Soil body curing agent containing plant urease and zero-waste production process thereof |
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2022
- 2022-11-15 CN CN202211427031.6A patent/CN115897528B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003048382A1 (en) * | 2001-12-03 | 2003-06-12 | Sievers Instruments, Inc. | Sensitive detection of urea and related compounds in water |
| CN109723057A (en) * | 2018-12-29 | 2019-05-07 | 青岛理工大学 | Soil body reinforcing method for double-high-pressure stirring and spraying construction |
| CN112877073A (en) * | 2020-12-31 | 2021-06-01 | 河海大学 | Soil body curing agent containing plant urease and zero-waste production process thereof |
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| CN115897528A (en) | 2023-04-04 |
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