CN108331604B - Crack microorganism self-repairing lets pressure stock - Google Patents
Crack microorganism self-repairing lets pressure stock Download PDFInfo
- Publication number
- CN108331604B CN108331604B CN201810167733.2A CN201810167733A CN108331604B CN 108331604 B CN108331604 B CN 108331604B CN 201810167733 A CN201810167733 A CN 201810167733A CN 108331604 B CN108331604 B CN 108331604B
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- Prior art keywords
- rod body
- repairing
- self
- extrusion crushing
- yielding
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/028—Devices or accesories for injecting a grouting liquid in a bore-hole
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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
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
Abstract
The invention relates to a crack microorganism self-repairing yielding anchor rod, which comprises a rod body, a supporting base plate, a nut, an overflow stopper, a yielding device and a self-repairing device, wherein the rod body is provided with a plurality of grooves; the pressure yielding device is sleeved at the head end of the rod body, and an anchoring agent layer is arranged at the outer side of the pressure yielding device; the self-repairing device comprises a sleeve sleeved outside the rod body, a plurality of extrusion crushing pipes, a piston and a baffle, wherein the extrusion crushing pipes at least comprise extrusion crushing pipes for containing bacterial suspension, extrusion crushing pipes for containing A-component adhesives and extrusion crushing pipes for containing B-component adhesives and mixed liquid of urea and a calcium source. By adopting the technical scheme of the invention, the invention discloses a crack microorganism self-repairing yielding anchor rod, which can maintain the integrity of rock mass, reduce anchor rod erosion and increase the safety of a supporting system, realize the combination of yielding and self-repairing functions and is suitable for surrounding rock supporting with high ground stress threat.
Description
Technical Field
The invention relates to the field of geotechnical engineering anchoring support, in particular to the field of rock mass support, and particularly relates to a crack microorganism self-repairing yielding anchor rod which is suitable for surrounding rock support with high ground stress threat and has practical significance for effectively preventing and controlling damage caused by surrounding rock deformation.
Background
In geotechnical engineering support, an anchor rod is a support device widely applied. Along with the increasing burial depth of projects such as mines, water conservancy, tunnels and the like, the facing geological conditions are more and more complex, the demands of energy absorbing anchor rods are expanding continuously worldwide, and various types of energy absorbing anchor rods are already on the market. The main principle of the energy-absorbing anchor rod is that the coordinated deformation of the anchor rod and surrounding rock is realized through the deformation or the sliding of the yielding device, the extension of the rod body and the like, so that the yielding purpose is achieved. However, after surrounding rock is deformed, the generation of cracks provides a convenient passage for water and gas, so that the corrosion speed of the anchor rod is accelerated, and the safety of a supporting system is reduced. Patent number CN201620455278.2, which addresses this problem, discloses a "large deformation self-repairing anti-rock burst anchor," which can produce a large deformation to provide a constant resistance while achieving self-repairing of rock mass cracks. The anchor rod is deformed by pressure, and meanwhile, the adhesive of the component A in the sleeve is extruded into the expansion body pipe and is mixed with the adhesive of the component B to generate foam adhesive, and the foam adhesive is filled into the anchor hole and the crack generated by rock mass deformation, so that the aim of self-repairing is achieved. However, if the yielding device is deformed little, the A-component adhesive and the B-component adhesive are not sufficiently mixed, and the self-repairing effect is further affected.
In view of this, the present inventors have conducted intensive studies on the above problems, and have made the present invention.
Disclosure of Invention
The invention aims to provide the crack microorganism self-repairing yielding anchor rod which has a simple structure, is easy to process and manufacture and has better safety.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a fracture microorganism self-repairing yielding anchor rod comprises a rod body, a supporting base plate, a nut, an overflow stopper, a yielding device and a self-repairing device; the pressure yielding device is sleeved at the head end of the rod body, and an anchoring agent layer is arranged on the outer side of the pressure yielding device; the self-repairing device comprises a sleeve and a plurality of extrusion crushing pipes sleeved outside the rod body, the sleeve is sleeved outside the rod body and is connected with the tail end of the pressure yielding device in a static mode, the baffle is sleeved outside the rod body and is connected with the tail end of the sleeve in a static mode, the piston is arranged in the sleeve and is located at the head end of the sleeve, the piston is fixedly connected with the rod body, the extrusion crushing pipes are arranged in the sleeve, one end of each extrusion crushing pipe is tightly attached to the tail end of the piston, the other end of each extrusion crushing pipe is tightly attached to the head end of the baffle, the overflow stop plug, the support base plate and the nut are arranged at the tail end of the rod body, and the extrusion crushing pipes at least comprise an extrusion crushing pipe filled with bacterial suspension, an extrusion crushing pipe used for containing component A adhesives and an extrusion crushing pipe used for containing mixed adhesives of component B adhesives, urea and calcium sources, and the component adhesives are matched with the known adhesives.
As a preferred mode of the present invention, the B-component adhesive, the urea and the calcium source are placed in the same extrusion crushing tube.
As a preferable mode of the invention, the rod body is in a solid cylinder shape, and the rod body is a round steel rod body or a glass fiber reinforced plastic rod body.
As a preferable mode of the present invention, the pressure relief device has a cylindrical structure, and the pressure relief device is a constant-resistance pressure relief device or a variable-resistance pressure relief device.
As a preferable mode of the invention, the sleeve is a stainless steel pipe with the outer diameter smaller than the bore diameter of the drill hole, and the wall of the stainless steel pipe is provided with evenly distributed round holes.
In a preferred mode of the invention, the piston is in a circular ring shape, the piston is made of steel, the side face, close to the rod body, of the piston is welded on the rod body, and the extrusion crushing pipe is made of brittle materials.
As a preferable mode of the present invention, the crushing pipes extend in the axial direction of the rod body, and the plurality of crushing pipes are uniformly arranged between the sleeve and the rod body in the circumferential direction of the rod body.
As a preferable mode of the present invention, the number of the crushing pipes is 12.
As a preferred mode of the present invention, the bacterial suspension is a Bacillus sphaericus suspension having a concentration of 10 9 cell/ml, wherein the concentration of urea is 1 mol/ml, and the calcium source adopts CaCl 2 The concentration was 1mol/l.
As a preferable mode of the invention, the adhesive of the A component is an adhesive component with hydroxyl groups, and the adhesive of the B component is an adhesive component with free isocyanate groups.
By adopting the technical scheme of the invention, the beneficial effects are as follows: the anchor rod structure mainly comprises a rod body, a supporting base plate, a nut, an overflow stopper, a yielding device and a self-repairing device, and is simple in structure; when the rod body generates axial relative displacement, the pressure device provides deformation resistance, the crushing pipe is extruded and crushed, the A-component adhesive and the B-component adhesive are fused to generate polyurethane foam, and the gap between the bonding rod body and the hole wall and the gap generated by rock mass deformation are filled. The bacterial cells are embedded into the polyurethane foam, the polyurethane foam plays a role in fixing bacteria, and the bacteria contact a calcium source and urea to generate calcium carbonate so as to realize self-repairing of cracks. The invention can maintain the integrity of rock mass, reduce the erosion of the anchor rod and increase the safety of a supporting system, realizes the combination of yielding and self-repairing functions, and is suitable for surrounding rock supporting with high ground stress threat.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a cross-sectional view of the anchor rod at A-A of FIG. 1;
in the figure:
rod body 1 yielding device 2
Sleeve 3 piston 4
Baffle 6 of extrusion crushing pipe 5
Anchoring agent layer 7 spill-proof plug 8
Nut 9 bearing pad 10
Drilling 11 bacterial suspension 12
A-component adhesive 13
Mixed solution 14 of B component adhesive, urea and calcium source
Detailed Description
The fracture microorganism self-repairing yielding anchor rod comprises a rod body 1, a yielding device 2 and a self-repairing device, wherein the yielding anchor rod is shown in figures 1 and 2; the rod body 1 is in a solid cylindrical shape and is processed by adopting round steel, the rod body 1 is positioned in the middle of the crack microorganism self-repairing yielding anchor rod, one end of the rod body 1, which is close to the deep part of the drilling hole 11, is taken as a head end, one end of the rod body 1, which is far away from the deep part of the drilling hole 11, is taken as a tail end, the head end of the rod body 1 is connected with the yielding device 2, the tail end of the rod body 1 is connected with the supporting base plate 10 and the nut 9 through threads, the supporting base plate 10 is a metal supporting base plate, the nut 9 is in threaded connection with the rod body 1 through the equal-strength nut, the position, which is close to the tail end, of the rod body 1 is sleeved with the overflow stop plug 8 for sealing the drilling hole 11, the overflow stop plug 8 is an annular rubber product, the outer diameter of which is slightly larger than the bore diameter of the drilling hole, and the inner diameter of which is slightly smaller than the diameter of the rod body 1, so that the sealing effect is realized.
Let pressure equipment 2 be tubular structure, let the middle part of pressure equipment 2 be formed with the hole, let pressure equipment 2 pass through the hole suit at the head end of body of rod 1, let the hole of pressure equipment 2 and body of rod 1 size match, let pressure equipment 2 adopt friction-type constant resistance to let pressure equipment, let the outside of pressure equipment 2 cover and have anchoring agent layer 7.
The self-repairing device comprises a sleeve 3 sleeved outside a rod body 1, an extrusion crushing pipe 5, a piston 4, a baffle 6 and a bi-component adhesive, wherein the sleeve 3 is a stainless steel pipe with the outer diameter smaller than the bore diameter of a drilling hole 11, and circular holes are uniformly distributed in the pipe wall and used for placing the extrusion crushing pipe 5. The sleeve 3 is sleeved outside the rod body 1 and is in threaded connection with the tail end of the pressure yielding device 2, the piston 4 is circular, the piston 4 is manufactured by steel, the side face, close to the rod body 1, of the piston 4 is welded on the rod body 1, the piston 4 is arranged in the sleeve 3, the outer diameter of the piston 4 is slightly smaller than the inner diameter of the sleeve 3, the piston 4 is clamped between the rod body 1 and the sleeve 3, the piston 4 can move in the sleeve 3 along with the rod body 1, the baffle 6 is circular, sleeved outside the rod body 1 and welded at the tail end of the sleeve 3.
The extrusion crushing pipe 5 is formed by processing glass, the extrusion crushing pipe 5 is arranged in the sleeve 3, one end of the extrusion crushing pipe 5 is tightly attached to the tail end of the piston 4, the other end of the extrusion crushing pipe 5 is tightly attached to the head end of the baffle 6, the bacterial suspension 12, the A component adhesive 13, the B component adhesive, the mixed solution 14 of urea and calcium sources are respectively contained in different extrusion crushing pipes according to a certain proportionIn the invention, the adhesive of the component B, urea and a calcium source can be respectively placed in different extrusion crushing pipes, the number of the extrusion crushing pipes 5 is 12 and divided into four groups, and the extrusion crushing pipes 5 are symmetrically arranged between the sleeve 3 and the rod body 1. The bacteria were Bacillus sphaericus (B.sphaericus, LMG 22,557) at a concentration of 10 9 cell/ml. Urea concentration is 1mol/l, and CaCl is adopted as calcium source 2 The concentration was 1mol/l.
In the invention, the A-component adhesive 13 and the B-component adhesive and the mixed solution 14 of urea and a calcium source form a microbial repair reagent. The adhesive of the component A13 and the adhesive of the component B can be adhesives introduced in the prior art, such as corresponding components in the patent number CN 201620455278.2.
Microbiological mineralogy studies have shown that certain bacteria in the soil, such as sarcina barbita (Sporosarcina pasteurii), possess the magic power of setting loose sand gums together, which utilizes organic matter such as urea in the reaction environment and a source of calcium ions, to precipitate faster calcium carbonate crystals with good gelling properties, a technique called MICP (Microbial Induced Carbonate Precipitation) (DeJong et al, 2006). Bacillus pasteurisus can continue to produce a highly active urease during its own growth metabolism. Urease can catalyze the hydrolysis of urea to form ammonia and carbon dioxide, which are dispersed into solution through the cell wall, and then rapidly hydrolyze to form ammonium ions and carbonate ions. Carbonate generated after urea hydrolysis encounters calcium ions to generate calcium carbonate precipitates, and bacteria are wrapped. During the entire reaction, bacteria play a major role, the core of which is to provide urease and the other of which is to provide nuclei for calcium carbonate crystal formation (DeJong et al, 2006).
Jonkers, university of Dutch Deerful, used aerobic alkali-resistant bacillus to replace anaerobic bacillus and the culture medium to mix with concrete material, and used microorganism to conduct self-healing study of concrete. The high alkalinity of the concrete causes bacteria to be in dormant spore state, and once the concrete cracks, oxygen and moisture enter, so that the bacteria resume their metabolism function, breathe to generate carbon dioxide, and the carbon dioxide reacts with calcium ions in the cement-based material in a moist environment to generate calcium carbonate, so that further propagation of cracks is avoided. The concentration of bacterial liquid, urea and calcium source that gave the maximum amount of calcium carbonate deposition was studied by university of belgium j.y.wang et al, and experiments demonstrated that the intensity could be restored to 60% of the initial value due to the self-healing effect. See DeJong, j.t., fritzges, m.b., and Nusslein, k.microfly induced cementation to control sand response to undrained area.journal of Geotechnical and Geoenvironmental Engineering,2006,132 (11), 1381-1392.Jonkers H.M. Self-sealing continuity a biological approach [ M ] Self-sealing materials, springer Netherlands,2008:195-204.Wang j.y., van tittelbottom k., de Belie n., et al patent of applying bacteria to heal cracks in concrete [ C ]. Proceedings of the second international conference on sustainable construction materials and technologies, ancona, italy.2010:1807-1818.
The invention skillfully utilizes the characteristics of the bacteria and realizes the self-repairing of the cracks by combining a calcium source and urea to generate calcium carbonate.
The following describes the installation mode and working principle of the invention in combination with the structure of the invention:
when the crack microorganism self-repairing yielding anchor rod is installed, an early-strength anchoring agent is filled in the deep part of a drilling hole 11, a rod body 1, a yielding device 2 and a self-repairing device are assembled into a whole outside the drilling hole 11, the assembled whole is placed into the drilling hole 11, the yielding device 2 at the head end of the rod body 1 fully stirs and extrudes the early-strength anchoring agent and fills the hole tightly, so that an anchoring agent layer 7 is formed at the outer side of the yielding device 2, after the early-strength anchoring agent reaches the required strength, a spill-proof plug 8, a supporting base plate 10 and a nut 9 can be sequentially installed at the tail end of the rod body 1 for tensioning, a certain prestress is applied, the yielding device 2 provides deformation resistance when the surrounding rock deforms to enable the rod body 1 to generate axial relative displacement, meanwhile, the piston 4 extrudes and crushes a crushing pipe 5 due to the rod body 1, an A component adhesive 13 and a B component adhesive 14 in the extrusion crushing pipe 5 are fused to generate polyurethane foam which fills cracks generated by the drilling hole 11 and rock deformation. Bacterial cells are embedded into polyurethane foam, bacteria are immobilized by the polyurethane, calcium carbonate generated by the bacteria contacting with a calcium source and urea further fills the cracks, self-repairing of surrounding rock cracks is realized, and the overflow stopper 8 prevents microorganism repairing reagents from overflowing from the tail end of the rod body 1 to the drill hole 11.
Therefore, the invention realizes the combination of yielding and self-repairing functions, and is suitable for surrounding rock support with high ground stress threat.
The above examples and drawings are not intended to limit the form or form of the present invention, and any suitable variations or modifications thereof by those skilled in the art should be construed as not departing from the scope of the present invention.
Claims (10)
1. A fracture microorganism self-repairing yielding anchor rod comprises a rod body, a supporting base plate, a nut, an overflow stopper, a yielding device and a self-repairing device; the pressure yielding device is sleeved at the head end of the rod body, and an anchoring agent layer is arranged on the outer side of the pressure yielding device; the method is characterized in that: the self-repairing device comprises a sleeve and a plurality of extrusion crushing pipes sleeved outside the rod body, the sleeve is sleeved outside the rod body and is fixedly connected with the tail end of the pressure yielding device, the baffle is sleeved outside the rod body and is fixedly connected with the tail end of the sleeve, the piston is arranged in the sleeve and is positioned at the head end of the sleeve, the piston is fixedly connected with the rod body, the extrusion crushing pipes are arranged in the sleeve, one end of each extrusion crushing pipe is tightly attached to the tail end of the piston, the other end of each extrusion crushing pipe is tightly attached to the head end of the baffle, the overflow stopper, the supporting base plate and the nut are installed at the tail end of the rod body, and the extrusion crushing pipes at least comprise an extrusion crushing pipe for containing bacterial suspension, an extrusion crushing pipe for containing component A adhesive and an extrusion crushing pipe for containing urea, and an extrusion crushing pipe for containing calcium source, and the component A adhesive and the component B adhesive are matched with each other.
2. A fissured microbial self-repairing yield anchor as claimed in claim 1, wherein: the component B adhesive, the urea and the calcium source are arranged in the same extrusion crushing pipe.
3. A fissured microbial self-repairing yield anchor as claimed in claim 1, wherein: the rod body is in a solid cylinder shape, and is a round steel rod body or a glass fiber reinforced plastic rod body.
4. A fissured microbial self-repairing yield anchor as claimed in claim 1, wherein: the yielding device is of a cylindrical structure, and is a constant-resistance yielding device or a variable-resistance yielding device.
5. A fissured microbial self-repairing yield anchor as claimed in claim 1, wherein: the sleeve is a stainless steel pipe with the outer diameter smaller than the bore diameter of the drill hole, and the wall of the stainless steel pipe is provided with evenly distributed round holes.
6. A fissured microbial self-repairing yield anchor as claimed in claim 1, wherein: the piston is circular, the piston is made of steel, the side surface of the piston, which is close to the rod body, is welded on the rod body, and the extrusion crushing pipe is formed by processing brittle materials.
7. A fissured microbial self-repairing yield anchor as claimed in claim 1, wherein: the extrusion crushing pipes extend along the axial direction of the rod body, and a plurality of extrusion crushing pipes are uniformly distributed between the sleeve and the rod body along the circumferential direction of the rod body.
8. A fissured microbial self-repairing yield anchor according to claim 6, wherein: the number of the extrusion crushing pipes is 12.
9. A device according to claim 1The utility model provides a crack microorganism self-repairing lets pressure stock which characterized in that: the bacterial suspension is bacillus sphaericus suspension with the concentration of 10 9 cell/ml, wherein the concentration of urea is 1 mol/ml, and the calcium source adopts CaCl 2 The concentration was 1mol/l.
10. A fissured microbial self-repairing yield anchor according to claim 8, wherein: the A-component adhesive is an adhesive component with hydroxyl groups, and the B-component adhesive is an adhesive component with free isocyanate groups.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810167733.2A CN108331604B (en) | 2018-02-28 | 2018-02-28 | Crack microorganism self-repairing lets pressure stock |
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| CN201810167733.2A CN108331604B (en) | 2018-02-28 | 2018-02-28 | Crack microorganism self-repairing lets pressure stock |
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| CN108331604A CN108331604A (en) | 2018-07-27 |
| CN108331604B true CN108331604B (en) | 2023-07-18 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110565668A (en) * | 2019-09-02 | 2019-12-13 | 浙江大学 | Novel MICP grouting threaded anchor rod and cable trench plugging and reinforcing method |
| CN111502720B (en) * | 2020-05-28 | 2021-07-06 | 淮南矿业(集团)有限责任公司 | Solid anchor rod capable of grouting |
| CN114483138B (en) * | 2022-01-25 | 2022-12-02 | 中国矿业大学 | Anchoring end self-repairing type anchor rod anchoring device and using method thereof |
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