CN102493493B - Method for plugging horizontal fissures of basement concrete structure by grouting microorganisms - Google Patents
Method for plugging horizontal fissures of basement concrete structure by grouting microorganisms Download PDFInfo
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- CN102493493B CN102493493B CN 201110412162 CN201110412162A CN102493493B CN 102493493 B CN102493493 B CN 102493493B CN 201110412162 CN201110412162 CN 201110412162 CN 201110412162 A CN201110412162 A CN 201110412162A CN 102493493 B CN102493493 B CN 102493493B
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Abstract
The invention discloses a method for plugging horizontal fissures of a basement concrete structure by grouting microorganisms. The method comprises the following steps of: excavating filled earth, pouring water, constructing a cement mortar grouting trough, preparing bacteria liquid and a nutritive salt solution, pouring the bacteria liquid, and pouring the nutritive salt solution. In the processes of pouring the bacteria liquid, and the nutritive salt solution, poured liquid are allowed to flow out of the inner sides of the fissures, but the flowing amount is gradually reduced along with the increasing of the pouring frequency, and finally the poured liquid stops flowing completely; and if the width of the fissures is more than 0.5mm, in order to prevent most of the bacteria liquid and the nutritive salt solution from flowing out, the inner sides of the fissures are plugged by using absorbent cotton and gauze, and then the liquid and solution are grouted. Calcium chloride is introduced by the bacteria liquid to generate calcium carbonate sediments which can effectively fill and plug the fissures and pouring holes.
Description
Technical field
The present invention relates to shutoff and the restorative procedure of distress in concrete in a kind of civil engineering, especially a kind of method of microorganism grout sealing Basement Concrete Structures transverse crack.
Background technology
According in recent years national basement in high rise building investigation being found that the cracking quantity of basement in high rise building exterior wall accounts for by about 85% of investigation engineering sum, the phenomenon that the crack appears in base plate accounts for by about 10% of investigation sum.Simultaneously analysis of survey results is found that in the various negative consequences that caused by the crack, seepage accounts for 60%.Therefore, the Crack Control problem of concrete structure just becomes one of important research project in the construction work.Particularly over the past two decades, after the pumping commercial concrete obtained extensive use, the problem that the crack produces was outstanding day by day.
The blocking method of existing basement has a lot, but effect is all undesirable.Reason has two aspects: after (1) basement built up, wall outside backfill was difficult in exterior wall and repairs; (2) mostly existing patching material is the material of organic or hydrophobic, and problem of aging is arranged, and the coefficient of expansion and concrete are inconsistent.Therefore, leakage problems becomes old, big, the difficult problem of puzzlement engineering circle.Repairing method of microorganism is a kind of method of novel repairing concrete crack, and product is consistent with former concrete, should not ftracture after the reparation.Grouting agent is liquid, is easy to infiltrate in the seam, forms deposition in seam.Durability and the intensity of the concrete material after the reparation all are greatly increased, and good with the associativity of concrete material.
Utilizing microorganism diagenesis recovery technique is a kind of international advanced technology of subject crossing.Its mechanism is to utilize microorganism induction to generate mineral deposition to fill up and the rehabilitating concrete defective: some basophilous edaphon utilizes the urease that self produces that hydrolysis of urea is ammonia and carbon dioxide, the increase of decomposing the ammonia quantity that generates can cause the rising of pH value on every side, thereby causes the deposition of calcium carbonate.In inducing the process of tosca, action of microorganisms is not only the generation urease, but also the place of nucleation is provided for the deposition of calcium carbonate.In civil engineering, the microorganism recovery technique mainly is to utilize cultured microorganism to induce tosca rehabilitating concrete defective, and shutoff and ground processing etc. are carried out in the crack at present.The application of the Cheng Xiao of Tsing-Hua University brightness patent " a kind of microorganism cause cement or concrete and production method and application " (CN200810105947.3), the fluid,matching that proposes to utilize the Pasteur bacillus bacterium liquid that can produce urase and contain urea and mineral calcium salt mixes, reaction under certain condition get final product microorganism cause cement or concrete method, but do not provide especially the method that specifically mends a split about basement.
Chinese patent application 200810019165.8 discloses a kind of microorganism reparation cement-based material crack method and nutrient solution and reparation nutrient solution of utilizing.It adopts microbial inoculum and repairs nutrient solution and inject cement stony fracture seam, carries out maintenance.But this method and useless relating to concrete grammar, step in bacterium liquid and the reparation nutrient solution injection crack.
Summary of the invention
The objective of the invention is for overcoming above-mentioned the deficiencies in the prior art, a kind of method of microorganism grout sealing Basement Concrete Structures transverse crack is provided, this method is easy to operate, and crack closure is effective, is easy to construction.
For achieving the above object, the present invention adopts following technical proposals:
A kind of method of microorganism grout sealing Basement Concrete Structures transverse crack, step is as follows:
(1) excavation that bankets
Excavation basement wall external body is banketed, and exposes horizontal seam;
(2) pour water
The clear and definite percolation path of pouring water is removed corresponding site body of wall surface layer in the basement clean simultaneously;
(3) construction cement mortar grout groove
A del grout groove is done with cement mortar in the crack outside, prevents from that bacterium liquid and nutritive salt from infiltrating to banket;
(4) bacterium liquid and nutrient salt solution preparation
Prepare 3-5 with fermentation tank and rise the Pasteur bacillus, enzymatic activity OD600 is greater than 1; Preparation contains the calcium chloride of 1mol/L and the nutrient salt solution of 1mol/L urea;
(5) perfusion bacterium liquid
Perfusion bacterium liquid is filled in seam in from grout groove to the crack, and liquid level exceeds crack 3-5mm;
(6) perfusion nutrient salt solution
Wait for that bacterium liquid liquid level descends, the bacterium liquid more than 80% injects the calcium chloride that contains 1mol/L of twice bacteria liquid amount and the nutrient salt solution of 1mol/L urea respectively after infiltrating the crack in grout groove.
(7) continued perfusion bacterium liquid in follow-up 4 days
Pour into one time bacterium liquid follow-up 4 day every day, method for filling is with (5) step;
(8) continued the perfusion nutrient salt solution in follow-up 9 days
Pour into the one time of nutrition salting liquid follow-up 9 day every day, method for filling is with (6) step, and the tosca thing that bacterium liquid induces calcium chloride to generate can be filled crack and fill orifice and shutoff effectively.
Described step (5) in the process of bacterium liquid and nutritive salt perfusion, allows that the liquid of perfusion flows out in the inboard in crack to step (8), but the amount that flows out can progressively reduce along with the increase of perfusion number of times, stops fully at last; If the width in crack is greater than 0.5mm, for preventing big outflow of bacterium liquid and nutritive salt, row grouting again after absorbent cotton and gauze shutoff are used in the inboard in crack.
The invention has the beneficial effects as follows that this method is easy to operate, crack closure is effective, is easy to construction, primary fissure can be sewed with the effect shutoff.Check behind water injection test and rain seepage do not occur with the crack of this method shutoff.
Description of drawings
Schematic diagram when Fig. 1 is the invention process;
Fig. 2-Fig. 6 is the photo of field trial; Wherein Fig. 2 is that grout groove is made photo; Fig. 3 is the water injection test photo; Fig. 4 is water injection test (body of wall is spread and sunk in wet) photo before the leak stopping; Fig. 5 is water injection test after the leak stopping (leakproof) photo; Fig. 6 contrasts photo behind leak stopping place (left side) and not leak stopping place (right side) rain;
Wherein 1. basement wall external body are banketed, 2. grout groove, 3. bacterium liquid and nutritive salt, 4. laterally seam, 5. concrete exterior wall, 6. absorbent cotton and gauze.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
As Fig. 1-shown in Figure 6, the method for microorganism grout sealing Basement Concrete Structures transverse crack, step is as follows:
(1) excavation that bankets
Excavation basement wall external body bankets 1, exposes horizontal seam 4;
(2) pour water
The clear and definite percolation path of pouring water is removed corresponding site body of wall surface layer in the basement clean simultaneously;
(3) construction cement mortar grout groove
A del grout groove 2 is done with cement mortar in the crack outside, prevents from that bacterium liquid and nutritive salt 3 from infiltrating to banket;
(4) bacterium liquid and nutrient salt solution preparation
Prepare 3-5 with fermentation tank and rise the Pasteur bacillus, enzymatic activity OD600 is greater than 1; Preparation contains the calcium chloride of 1mol/L and the nutrient salt solution of 1mol/L urea;
(5) perfusion bacterium liquid
Perfusion bacterium liquid is filled in seam in from grout groove 2 to the crack, and liquid level exceeds crack 3-5mm;
(6) perfusion nutrient salt solution
Wait for that bacterium liquid liquid level descends, after the bacterium liquid more than 80% infiltrates the crack, in grout groove 2, inject the calcium chloride that contains 1mol/L of the long-pending amount of twice bacteria liquid and the nutrient salt solution of 1mol/L urea respectively.
(7) continued perfusion bacterium liquid in follow-up 4 days
Pour into one time bacterium liquid follow-up 4 day every day, method for filling is with (5) step;
(8) continued the perfusion nutrient salt solution in follow-up 9 days
Pour into the one time of nutrition salting liquid follow-up 9 day every day, method for filling is with (6) step, and the tosca thing that bacterium liquid induces calcium chloride to generate can be filled crack and fill orifice and shutoff effectively.
Described step (5) in the process of bacterium liquid and nutritive salt 3 perfusions, allows that the liquid of perfusion flows out in the inboard in crack to step (8), but the amount that flows out can progressively reduce along with the increase of perfusion number of times, stops fully at last; If the width in crack greater than 0.5mm, flows out row grouting again after absorbent cotton and gauze 6 shutoff are used in the inboard in crack for preventing bacterium liquid and nutritive salt 3 big portions.
Though above-mentionedly by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (2)
1. the method for a microorganism grout sealing Basement Concrete Structures transverse crack is characterized in that step is as follows:
(1) excavation that bankets
Excavation basement wall external body is banketed, and exposes horizontal seam;
(2) pour water
The clear and definite percolation path of pouring water is removed corresponding site body of wall surface layer in the basement clean simultaneously;
(3) construction cement mortar grout groove
A del grout groove is done with cement mortar in the crack outside, prevents from that bacterium liquid and nutritive salt from infiltrating to banket;
(4) bacterium liquid and nutrient salt solution preparation
Prepare 3-5 with fermentation tank and rise the Pasteur bacillus, enzymatic activity OD600 is greater than 1; Preparation contains the calcium chloride of 1mol/L and the nutrient salt solution of 1mol/L urea;
(5) perfusion bacterium liquid
Perfusion bacterium liquid is filled in seam in from grout groove to the crack, and liquid level exceeds crack 3-5mm;
(6) perfusion nutrient salt solution
Wait for that bacterium liquid liquid level descends, after the bacterium liquid more than 80% infiltrates the crack, in grout groove, inject the calcium chloride that contains 1mol/L of the long-pending amount of twice bacteria liquid and the nutrient salt solution of 1mol/L urea respectively;
(7) continued perfusion bacterium liquid in follow-up 4 days
Pour into one time bacterium liquid follow-up 4 day every day, method for filling is with (5) step;
(8) continued the perfusion nutrient salt solution in follow-up 9 days
Pour into the one time of nutrition salting liquid follow-up 9 day every day, method for filling is with (6) step; The tosca thing that bacterium liquid induces calcium chloride to generate can be filled crack and fill orifice and shutoff effectively.
2. the method for claim 1 is characterized in that, described step (5) is to step (8), in the process of bacterium liquid and nutritive salt perfusion, the liquid of allowing perfusion flows out in the inboard in crack, but the amount that flows out can progressively reduce along with the increase of perfusion number of times, stops fully at last; If the width in crack is greater than 0.5mm, for preventing big outflow of bacterium liquid and nutritive salt, row grouting again after absorbent cotton and gauze shutoff are used in the inboard in crack.
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Families Citing this family (14)
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| CN103043937B (en) * | 2012-12-27 | 2015-12-23 | 同济大学 | The complex capsule underground structure concrete self-repairing system of a kind of built-in aerobic microorganism |
| CN104196131B (en) * | 2014-09-11 | 2016-06-01 | 山东建筑大学 | The cast-in-place slab-type apartment building plate of microbiological precipitation of CaCO 3 blocking concrete or soleplate crack method |
| CN104818719B (en) * | 2015-03-16 | 2018-02-23 | 山东建筑大学 | A kind of microorganism grouting method for improving calcium carbonate early stage deposition |
| CN105484298B (en) * | 2016-01-08 | 2017-09-05 | 三峡大学 | A kind of microorganism reinforces grouting maintenance experimental rig |
| CN105911260B (en) * | 2016-06-15 | 2018-01-12 | 天津大学 | A kind of experimental rig of microorganism remediation distress in concrete |
| CN106835878A (en) * | 2017-01-24 | 2017-06-13 | 华中科技大学 | A kind of embankment structure and construction method |
| CN109459364B (en) * | 2018-10-30 | 2021-04-09 | 河海大学 | Test device and method for reinforcing calcareous coarse-grained soil based on MICP |
| CN109184255A (en) * | 2018-10-31 | 2019-01-11 | 山东建筑大学 | A method of utilizing microorganism grout sealing outer wall of basement crack |
| CN110863517B (en) * | 2019-12-12 | 2021-01-12 | 昆明理工大学 | Method for sealing and blocking leakage of storage yard by utilizing microbial induction |
| CN112142409A (en) * | 2020-09-27 | 2020-12-29 | 长安大学 | Microbial self-healing waterproof anti-permeability mortar and preparation method thereof |
| CN112573941A (en) * | 2020-12-31 | 2021-03-30 | 武汉工程大学 | Method for repairing early cracks of cement stabilized macadam pavement base |
| CN113307656A (en) * | 2021-05-29 | 2021-08-27 | 兰州理工大学 | Method for repairing concrete cracks by using microorganisms |
| CN113685058A (en) * | 2021-09-14 | 2021-11-23 | 山东建筑大学 | Method for replacing low-strength mortar of wall by utilizing microbial grouting |
| CN114607167B (en) * | 2022-03-15 | 2023-09-08 | 中国水利水电科学研究院 | Crack repairing method and device by combining microorganism cement and chemical grouting technology |
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Effective date of registration: 20170329 Address after: 250014 Heping Road, Lixia District, Shandong, Ji'nan, China, No. 47 Patentee after: Shandong Jian special special engineering Co., Ltd. Address before: Feng Ming Licheng District Lingang Development Zone, 250101 Ji'nan Road, Shandong Province Patentee before: Shandong Construction University |
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