Microbial colloid anchor rod

Abstract

The utility model discloses a microbial colloid anchor rod, and belongs to the technical field of geotechnical engineering anchoring support. The anchor rod comprises a hollow glass fiber anchor rod body, grouting holes are formed in the surface of the anchor rod body, and the outer surface of the anchor rod body is coated with an anti-corrosion reinforcing layer. A microorganism temperature control vibration assembly is embedded in the outer wall of the anchor rod body and comprises a vibration rod and an integrated temperature control module connected with the vibration rod. The tail end of the anchor rod body is sequentially sleeved with an elastic stop-grouting plug, an anti-corrosion gasket and a locking nut. The anchor rod further comprises a colloid pretreatment assembly, the colloid pretreatment assembly is composed of bacterium liquid packaging units and cementing liquid packaging units, the bacterium liquid packaging units and the cementing liquid packaging units are independently packaged through degradable polylactic acid films, and the bacterium liquid packaging units and the cementing liquid packaging units are alternately stacked in the axial direction of the anchor rod. The reinforced concrete is reasonable in structural design, has good bonding strength and corrosion resistance, and is suitable for green and efficient reinforcement of geotechnical engineering such as foundation pits and side slopes.

Description

Technical Field

[0001] This utility model relates to the field of anchoring and support in geotechnical engineering, and in particular to a microbial colloidal anchor. Background Technology

[0002] In the field of geotechnical engineering, anchor bolt support technology, as a core means to ensure the safety of underground engineering projects, has been widely used in projects such as mine roadways, water conservancy tunnels, and deep-buried tunnels. As modern engineering construction continues to advance into deeper geological environments, complex geological conditions place higher demands on support systems.

[0003] Traditional grouting anchors exhibit significant technical limitations when dealing with high ground stress, strong seepage, and weak, fractured strata. Conventional chemical grouting materials generate substantial carbon dioxide emissions during production and on-site application, consuming 1.5 times the energy of traditional building materials, and pose an environmental risk of groundwater pollution during infiltration. The metal anchor body corrodes at an average annual rate exceeding 0.15 mm in acidic groundwater environments with a pH <5. Hydraulic fracturing of the chemical grout layer creates conductive seepage channels, accelerating the structural deterioration of the support system. While microbial mineralization technology, which has emerged in recent years, possesses environmentally friendly characteristics, it faces technical challenges in practical engineering applications, including high temperature sensitivity, low bacterial activation efficiency (metabolism efficiency declines by 40%-60% under on-site conditions), and uncontrollable mineralization processes. Existing technologies lack research and design on the synergistic mechanism of bacteria and grout for specific underground engineering conditions, and lack integrated designs for precise control of grouting and bacterial activation. Therefore, a green, environmentally friendly, and efficient novel microbial colloidal anchor is urgently needed. Summary of the Invention

[0004] The purpose of this invention is to provide a microbial colloidal anchor to solve the problem of soil and rock reinforcement in the prior art.

[0005] To achieve the above objectives, this utility model provides a microbial colloidal anchor bolt, including a colloidal pretreatment component. The biodegradable polylactic acid film encapsulates the bacterial solution and the cementing solution separately, which are then placed into the anchor hole in sequence. The anchor bolt body is a hollow rod-shaped structure with several grouting holes evenly distributed along the axial direction on its surface. The hole diameter is 3-8 mm, and the hole spacing is 50-100 mm. A microbial temperature-controlled vibration component is nested on the outer wall of the anchor bolt body, including a vibrating rod and an integrated temperature control module, used to adjust the temperature of the cementing solution to the optimal activity range of Bacillus pasteurellosis. The anchor bolt body and the temperature-controlled vibration component are inserted into the anchor hole, piercing the biodegradable polylactic acid film. The temperature-controlled vibration component is activated, and an acid-base regulator and microbial nutrient solution are injected through the grouting pipe. A grout stopper, an anti-corrosion gasket, and a nut are sequentially installed at the tail of the anchor bolt body.

[0006] Furthermore, the mass ratio of urea to calcium chloride in the cementing solution is 1:1.2-1.5, and the concentration of Bacillus pasteurellii in the bacterial solution is 106-108 CFU / mL.

[0007] Furthermore, the Bacillus pasteurellium metabolizes in the cementing solution to produce calcium carbonate precipitate, which fills the cracks in the rock and soil and forms a cemented reinforcement layer with the anchor bolt body.

[0008] Furthermore, the biodegradable polylactic acid (PLA) encapsulates the bacterial solution and the cementing solution respectively, with a film thickness of 0.05-0.2 mm and a degradation cycle of 6-12 months. After the anchor head of the anchor bolt body is pierced, the film ruptures and mixes with the bacterial solution and cementing solution.

[0009] Furthermore, the temperature-controlled vibration component has a vibration frequency of 20-50Hz and is nested on the outer wall of the anchor rod body. It includes a vibrating rod (frequency 20-50Hz) and an integrated temperature control module. The temperature is stabilized at 30-37℃ through a PID algorithm to maintain the optimal activity of Bacillus pasteurellosis.

[0010] Furthermore, the grout stopper is made of elastic silicone material, and its inner wall is connected to the anchor rod body. An anti-corrosion gasket made of engineering plastic is provided between the nut and the anchor rod body. The nut is fixed to the outermost exposed end of the anchor rod body.

[0011] Furthermore, the anchor body is made of glass fiber reinforced composite material, and its surface is uniformly provided with grouting holes with a diameter of 3-8mm. The anti-corrosion reinforcement layer is wrapped on the outer surface of the anchor body and is composed of a ceramic coating to improve corrosion resistance and extend the service life of the anchor.

[0012] Furthermore, the microbial nutrient solution is injected into the anchor body through the grouting pipe to continuously replenish the microorganisms with nitrogen and phosphorus-containing nutrients. The acid-base regulator is injected into the anchor body through the grouting pipe to adjust the pH of the cementing solution to the range of 8.5-9.5.

[0013] The beneficial effects of this utility model include: as a microbial colloidal anchor, the pre-prepared bacterial solution and cementing fluid are placed in the anchor hole during construction, increasing grouting efficiency by over 40%. The anchor body is inserted into the anchor hole to pierce the film of bacterial solution and cementing fluid, allowing them to mix, making the operation simple and convenient. The temperature-controlled vibration component accelerates the mixing of bacterial solution and cementing fluid. Nutrient solution and pH adjuster are injected into the anchor body to optimize bacterial activity, accelerate calcium carbonate precipitation, and improve cementing strength. Carbon emissions during construction are reduced by 60%, and there is no heavy metal pollution. This utility model has high adaptability to cementing, low environmental pollution, and stable performance throughout its entire life cycle, making it suitable for rock support in various engineering environments. Attached Figure Description

[0014] Figure 1This is a structural schematic diagram provided for an embodiment of the present utility model.

[0015] Figure 2 This is a schematic diagram of the bacterial solution and cementing fluid capsules provided in an embodiment of the present invention.

[0016] Figure 3 A schematic diagram of the anchor body and the microbial temperature-controlled vibration component provided in an embodiment of this utility model.

[0017] In the diagram: 1—Anchor bolt body; 2—Vibrator; 3—Integrated temperature control module; 4—Grouting hole; 5—Anti-corrosion reinforcement layer; 6—Bacterial solution; 7—Gluing solution; 8—Degradable polylactic acid film; 9—Nut; 10—Anti-corrosion gasket; 11—Grouting stop plug. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. Please refer to the accompanying drawings. Figures 1 to 3 This utility model provides a technical solution: a microbial colloidal anchor bolt, comprising a colloidal pretreatment component, a Bacillus pasteurellus bacterial solution with a concentration of 106-108 CFU / mL and a cementing solution with a mass ratio of urea to calcium chloride of 1:1.5, wherein the bacterial solution and the cementing solution are encapsulated separately using a biodegradable polylactic acid film in the form of capsules cylindrical in shape with a diameter matching the anchor hole, and are arranged alternately in the anchor hole in the order of "bacterial solution-cementing solution-bacterial solution-cementing solution".

[0019] The anchor rod body is a hollow rod-shaped structure with grouting holes evenly distributed on its surface, which can mix with the cementing liquid and bacterial solution. The microbial temperature-controlled vibration component includes a vibrating rod and an integrated temperature control module, which is nested on the outer wall of the anchor rod body. After the bacterial solution and cementing liquid in the anchor hole are arranged, the front end of the anchor rod body is aligned with the axis of the anchor hole. During the advancement process, the conical anchor head at the front end of the rod body pierces each layer of the thin film structure in sequence, releasing the bacterial solution and cementing liquid into the gap of the anchor hole. The advancement speed is controlled at 0.5-1.0 m / min to avoid grout splashing. After the anchor bolt body is inserted, a microbial temperature-controlled vibration assembly is placed inside. An integrated temperature control module monitors the grout temperature in real time via attached thermocouples and uses semiconductor heating / cooling elements to maintain the temperature at approximately 30°C, within the optimal activity range for the microbial community. A sodium bicarbonate buffer solution with a pH of 8.5-9.5 and a nutrient solution containing 0.15% peptone, 0.05% yeast extract, and 0.02% potassium dihydrogen phosphate are injected from the tail of the anchor bolt body. The grouting pressure is controlled at 0.3-0.5 MPa. Grouting is stopped when the grout overflows from the anchor hole, and the vibrator is started to vibrate for 15 minutes using a variable frequency vibration mode. The first 5 minutes use a 40Hz high-frequency vibration to promote thorough mixing of the microorganisms and the cementing solution, followed by a 10-minute switch to a 25Hz low-frequency vibration to promote penetration. The tail of the anchor bolt body is connected to the nut by threads. An equal-strength nut is used. The tail of the anchor bolt body is fitted with a grout stop plug and an anti-corrosion gasket. The inner diameter is similar to the diameter of the anchor bolt body. It is pressed into the anchor hole opening by a hydraulic jack with a compression rate of ≥30% to achieve dynamic sealing. Then, an equal-strength nut is used in conjunction with a torque wrench to apply pre-tightening force.

[0020] The anchor body is made of glass fiber reinforced composite material, and its surface is uniformly provided with grouting holes with a diameter of 3-8mm and a spacing of 50-100mm between adjacent holes. The anti-corrosion reinforcement layer is covered on the outer surface of the anchor body and consists of a ceramic coating with a thickness of 0.2-0.5mm, which is used to improve corrosion resistance and extend the service life of the anchor.

[0021] The grout stopper is made of elastic silicone material, and its inner wall is connected to the anchor rod body. An anti-corrosion gasket is provided between the nut and the anchor rod body. The gasket is made of engineering plastic with a thickness of 2-3mm. The nut is fixed to the outermost exposed end of the anchor rod body.

Claims

1. A microbial colloidal anchor bolt for anchoring and support in geotechnical engineering, characterized in that, include: The anchor body (1) is a hollow rod-shaped structure made of glass fiber reinforced composite material, and its rod body is uniformly provided with several grouting holes (4) along the axial direction; the anti-corrosion reinforcement layer (5) is covered on the outer surface of the anchor body (1); the colloidal pretreatment component includes a bacterial liquid encapsulation unit and a cementing liquid encapsulation unit, which are independently encapsulated by a biodegradable polylactic acid film (8), and the bacterial liquid encapsulation unit and the cementing liquid encapsulation unit are cylindrical and are arranged to be stacked alternately along the axial direction in the anchor hole; the microbial temperature-controlled vibration component is nested in the outer wall of the anchor body (1), including a vibrating rod (2) and an integrated temperature control module (3) connected to the vibrating rod (2); the grout stop plug (11), the anti-corrosion gasket (10) and the nut (9) are sequentially fitted on the tail end of the anchor body (1).

2. The microbial colloidal anchor bolt according to claim 1, characterized in that, The front end of the anchor body (1) is provided with a conical membrane-piercing structure for piercing the encapsulation film.

3. The microbial colloidal anchor bolt according to claim 1, characterized in that, The grout stopper (11) is made of elastic silicone material; the anti-corrosion gasket (10) is made of engineering plastic.

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