CN115897528A - Urease reinforcement-based detection method - Google Patents
Urease reinforcement-based detection method Download PDFInfo
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- CN115897528A CN115897528A CN202211427031.6A CN202211427031A CN115897528A CN 115897528 A CN115897528 A CN 115897528A CN 202211427031 A CN202211427031 A CN 202211427031A CN 115897528 A CN115897528 A CN 115897528A
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- reinforcement
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- roadbed
- hydraulic cylinder
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- 238000001514 detection method Methods 0.000 title claims abstract description 67
- 230000002787 reinforcement Effects 0.000 title claims abstract description 48
- 108010046334 Urease Proteins 0.000 title claims abstract description 33
- 239000002689 soil Substances 0.000 claims abstract description 40
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 23
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 20
- 238000005516 engineering process Methods 0.000 claims abstract description 19
- -1 ammonium ions Chemical class 0.000 claims abstract description 17
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims abstract description 11
- 229910000019 calcium carbonate Inorganic materials 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
- 238000004519 manufacturing process Methods 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
- 101000965313 Legionella pneumophila subsp. pneumophila (strain Philadelphia 1 / ATCC 33152 / DSM 7513) Aconitate hydratase A Proteins 0.000 claims description 8
- 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
- 230000009471 action Effects 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 238000012360 testing method Methods 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
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 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
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 239000001110 calcium chloride Substances 0.000 claims description 3
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 3
- 239000004202 carbamide Substances 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000003556 assay Methods 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 3
- 238000005553 drilling Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 235000010469 Glycine max Nutrition 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- 241000193395 Sporosarcina pasteurii Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Classifications
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- 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,the method comprises the following steps of preparing a urease reinforcement detection device and measuring the pH value of unreinforced alkaline soil, reinforcing the roadbed in an original soil area which is unreinforced in the first step by adopting a MICP (micro-Integrated Circuit process) technology or an EICP (electronic engineering load control) technology to form a reinforced roadbed, and driving the urease reinforcement detection device in the first step to the reinforced roadbed in the second step to detect the pH value of the soil: pH value After reinforcement Calculating the concentration of ammonium ions through a formula, and judging the reinforcing effect according to the concentration of the ammonium ions calculated in the third step, wherein the larger the concentration of the ammonium ions is, the more calcium carbonate crystals can be generated, and the better the reinforcing effect is; the lower the ammonium ion concentration, the less carbonate ions available for the production of calcium carbonate, and the more non-consolidated areas, thereby determining consolidated sites. The method of the invention is easy to detect the reinforcement range after the roadbed is reinforced by the MICP technology or the EICP technology and is rapid in detection.
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 process of highway subgrade construction, because the subgrade filling structure in a natural state is loose, and some sections have soft soil foundations, the problems of uneven settlement, unstable settlement and the like are caused, the driving safety is influenced, the service life of a road is shortened, and a large amount of manpower and capital are consumed in pavement maintenance every year.
At present, cement is mostly adopted for reinforcing the weak soil subgrade, but the cement needs higher energy in the production process and causes huge pollution. MICP (bacillus pasteurii induced calcium carbonate precipitation) technology and EICP (soybean urease induced calcium carbonate precipitation) technology are gradually favored as an effective, economical and green reinforcement mode, but how to determine the reinforcement range of the technology on the roadbed is an urgent problem to be solved.
Disclosure of Invention
In view of the above, the present invention provides a method for detecting roadbed reinforcement based on urease reinforcement, which is easy to detect roadbed reinforcement range and detection.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a urease reinforcement-based detection method, which is characterized by comprising the following steps of: comprises the following steps of (a) carrying out,
first step, preparation of ureaThe pH value of the original alkaline soil is A when the soil is not reinforced through the urease reinforcement detection device, and the concentration of hydroxyl ions in the soil is C (OH) - )＝10 A-14 Then, the urease reinforced detection device is driven away;
secondly, reinforcing the roadbed in the unreinforced undisturbed soil area in the first step by adopting the MICP technology or the EICP technology, wherein in the reinforced roadbed,
urea reacts to generate ammonium ions and carbonate ions under the action of urease, and the chemical reaction equation is
The resulting ammonium carbonate is then reacted with an added calcium source (calcium chloride) in the chemical reaction equation
(NH 4 ) 2 CO 3 +CaCl 2 →CaCO 3 ↓+2NH 4 Cl；
The ionization equilibrium constant of ammonia water at t ℃ is K b Obtaining ammonium chloride hydrolysis equilibrium constant
(K w Is the ionic product constant of water, K at 25 DEG C w ＝10 -14 ) Further, H in the soil after hydrolysis of ammonium chloride is known + The ion concentration is:
the roadbed in the reinforcement forms a reinforced roadbed after the reaction,
thirdly, driving the urease reinforcement detection device in the first step to the second step to detect the pH value of the soil in the reinforced road base After reinforcement At this time, pH After reinforcement Should be that
The ammonium ion concentration of the detection point in the reinforced roadbed can be calculated by the formula:
fourthly, judging the reinforcing effect according to the concentration of the ammonium ions calculated in the third step, wherein the larger the concentration of the ammonium ions is, the more calcium carbonate crystals can be generated, and the better the reinforcing effect is; the lower the ammonium ion concentration, the less carbonate ions available for the production of calcium carbonate, and the more non-consolidated areas, thereby determining consolidated sites.
In order to ensure the accuracy of detection and not destroy the soil structure after consolidating, further, in the above-mentioned scheme: testing the pH in the post-consolidated substrate should be done before the post-consolidated substrate hardens to clump.
In order to improve the detection precision, further, in the above scheme: the pH value detection in the post-reinforcement foundation is carried out by measuring three times at the top point, the middle point and the bottom point of the reinforcement depth according to the reinforcement depth, and respectively calculating the ammonium ion concentration of the detected point.
For the convenience of detection, further, in the above scheme: the urease reinforcement detection device comprises a movable trolley, a hydraulic source and a hydraulic cylinder a which are positioned on the movable trolley, wherein 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 comprises a protective shell and a hydraulic cylinder b positioned at the top end of the protective shell, the hydraulic cylinder b 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 the inner cavity of the protective shell, and a drill rod is fixed on a power output shaft of the driving motor;
and a detection pipe 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 pipe, 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 pipe.
In order to protect the soil pH meter in the detection pipe 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:
1. the method overcomes the defect that the reinforcement range is not easy to determine when the MICP technology and the EICP technology are adopted to carry out roadbed treatment, and provides a simple, reliable and convenient determination method for determining the reinforcement range by using the MICP technology and the EICP technology.
2. By the aid of the drill rod, soil, urease liquid and gel liquid can be fully mixed in a reinforced roadbed area, and roadbed treatment effect is enhanced; to not consolidating the region, with the soil body stirring, more make things convenient for the transfer of test bar.
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 objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the pH detection mechanism of the present invention;
reference numerals: 1. the trolley can be moved; 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 drive motor; 9. a protective shell; 10. drilling a rod; 11. a detection tube; 12. a hydraulic cylinder c; 13. a piston rod c; 14. a soil pH meter.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood 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-based reinforcement detection method of the present invention is characterized in that: comprises the following steps of (a) carrying out,
the first step, preparing urease reinforcing and detecting device, measuring the pH value of original alkaline soil when not reinforcing by urease reinforcing and detecting device to be A, and knowing that the concentration of hydroxyl ions in the soil is C (OH) - )＝10 A-14 Then, the urease reinforced detection device is driven away;
secondly, reinforcing the roadbed by adopting MICP technology or EICP technology in the unreinforced undisturbed soil area in the first step, wherein in the reinforced roadbed,
urea reacts to generate ammonium ions and carbonate ions under the action of urease, and the chemical reaction equation is
The resulting ammonium carbonate is then reacted with an added calcium source (calcium chloride) in the chemical reaction equation
(NH 4 ) 2 CO 3 +CaCl 2 →CaCO 3 ↓+2NH 4 Cl；
The ionization equilibrium constant of ammonia water at t ℃ is K b Obtaining ammonium chloride hydrolysis equilibrium constant
(K w Is the ionic product constant of water, K at 25 DEG C w ＝10 -14 ) Further knowing H in the soil after ammonium chloride hydrolysis + The ion concentration is:
the roadbed in the reinforcement forms a reinforced roadbed after the reaction,
thirdly, driving the urease reinforcement detection device in the first step to the second step to detect the pH value of the soil in the reinforced road base After reinforcement At this time, pH After reinforcement Should be that
The ammonium ion concentration of the detection point in the reinforced roadbed is calculated by the formula
Fourthly, judging the reinforcing effect according to the concentration of the ammonium ions calculated in the third step, wherein the larger the concentration of the ammonium ions is, the more calcium carbonate crystals can be generated, and the better the reinforcing effect is; the lower the ammonium ion concentration, the less carbonate ions that can be used to produce calcium carbonate, the more the unconsolidated area tends to be, thereby determining the consolidated location. The method is suitable for roadbed detection in a MICP/EICP in-situ perfusion reinforcement mode.
In order to ensure the accuracy of detection and not to damage the reinforced soil structure, further, in the above scheme: testing the pH in the post-consolidated foundation should be performed before the post-consolidated foundation hardens.
In order to improve the detection accuracy, in the above embodiment, it is preferable that: the pH value detection in the post-reinforcement foundation is carried out by measuring three times at the top point, the middle point and the bottom point of the reinforcement depth according to the reinforcement depth, and respectively calculating the ammonium ion concentration of the detected point.
For the convenience 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 which are positioned on the movable trolley 1, wherein 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 and a hydraulic cylinder b6 which is 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 at the top end of the detection tube 11, a soil pH meter 14 is fixed at 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.
In order to protect the soil pH meter 14 in the detection pipe 11 from being accidentally damaged while 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 urease reinforcement detection device works by firstly measuring the pH value of undisturbed soil when the soil is not reinforced, and after reinforcing the roadbed by adopting the MICP technology or the EICP technology, operating personnel drive the movable trolley 1 to the roadbed area after the reinforcing treatment. After the whole device is driven to a position near a certain reinforcing center of a reinforced roadbed area, an operator starts a hydraulic cylinder a to work, so that a lower port of a protective shell is tightly abutted to the detected area and a drill rod is perpendicular to a soil body, a driving motor 8 is started to rotate clockwise, then the operator starts a hydraulic cylinder b to work, and the drill rod 10 is driven to move by the combination of the hydraulic cylinder b and the driving motor 8And drilling in the detected area, and after the drill rod 11 advances to the reinforcement depth, rotating the drill rod 11 anticlockwise by the driving motor 8 and lifting the drilled detection hole upwards under the action of the hydraulic cylinder b. Subsequently, the operator operates the mobile cart 1 so that the inspection pipe can be vertically put into the inspection hole. And gradually pressing the soil pH meter 14 into the detection hole through the hydraulic cylinder c above, and measuring the soil pH values at the hole opening, the half reinforcing depth and the bottom of the detection hole by using the soil pH meter 14. By the formula
Calculating the concentration of ammonium ions, wherein if the concentration of the ammonium ions calculated according to the pH values at three points of the upper, middle and lower parts (the hole opening, half of the reinforcement depth and the hole bottom) of the detection hole is higher, the reinforcement effect is better, and the detection distance of a drilled hole is properly increased; if the difference value between the pH value of one point of the upper, middle and lower (the hole opening, half of the reinforcing depth and the hole bottom) points of the drill hole and the original soil is not large, and the calculated ammonium ion concentration is small, the reinforcing range at the drill hole is not uniform, and the detection hole is positioned 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 treatment quality of the roadbed is improved.
In the above embodiments, all the components are commercially available products.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (5)
1. A urease-based reinforcement detection method is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
firstly, preparing a urease reinforcement detection device, measuring the pH value of undisturbed alkaline soil which is not reinforced by the urease reinforcement detection device to be A, and knowing the concentration of hydroxyl ions in the soilIs C (OH) - )＝10 A-14 Then, the urease reinforced detection device is driven away;
secondly, reinforcing the roadbed by adopting MICP technology or EICP technology in the unreinforced undisturbed soil area in the first step, wherein in the reinforced roadbed,
urea reacts under the action of urease to generate ammonium ions and carbonate ions, and the chemical reaction equation is
The resulting ammonium carbonate is then reacted with an added calcium source (calcium chloride) in the chemical reaction equation
(NH 4 ) 2 CO 3 +CaCl 2 →CaCO 3 ↓+2NH 4 Cl；
The ionization equilibrium constant of ammonia water at t ℃ is K b Obtaining the equilibrium constant of ammonium chloride hydrolysis
(K w Is the ionic product constant of water, K at 25 DEG C w ＝10 -14 ) H in soil after hydrolysis of ammonium chloride + The ion concentration is: />
The roadbed in the reinforcement forms a reinforced roadbed after the reaction,
thirdly, the urease reinforcement detection device in the first step is driven to the second step to detect the pH value of the soil in the reinforced road foundation After reinforcement At this time, pH After reinforcement Should be that
The ammonium ion concentration of the detection point in the reinforced roadbed can be calculated by the formula:
fourthly, judging the reinforcing effect according to the concentration of the ammonium ions calculated in the third step, wherein the larger the concentration of the ammonium ions is, the more calcium carbonate crystals can be generated, and the better the reinforcing effect is; the lower the ammonium ion concentration, the less carbonate ions available for the production of calcium carbonate, and the more non-consolidated areas, thereby determining consolidated sites.
2. The urease-based assay of claim 1 wherein: testing the pH in the post-consolidated substrate should be done before the post-consolidated substrate hardens to clump.
3. The urease-based reinforcement detection method according to claim 1, wherein: the pH value detection in the post-reinforcement foundation is carried out by measuring three times at the top point, the middle point and the bottom point of the reinforcement depth according to the reinforcement depth, and respectively calculating the ammonium ion concentration of the detected point.
4. The urease-based assay of claim 1 wherein: 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, the end part of a piston rod a (4) of the hydraulic cylinder a (3) is fixedly provided with a pH detection mechanism (5), the pH detection mechanism (5) comprises a protective shell (9) and 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, the end part of a piston rod b (7) of the hydraulic cylinder b (6) is fixedly provided with a driving motor (8), the driving motor (8) is positioned in an inner cavity of the protective shell (9), and a drill rod (10) is fixedly arranged on a power output shaft of the driving motor (8);
a detection pipe (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 pipe (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 pipe (11).
5. The urease-based reinforcement detection method according to claim 4, wherein: 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 | Double high pressures, which are stirred, sprays work soil stabilization method |
| 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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- 2022-11-15 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 | Double high pressures, which are stirred, sprays work soil stabilization method |
| 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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