Device for reinforcing seabed coral sand and reef limestone foundation and construction method

Abstract

The invention discloses a device for reinforcing a seabed coral sand and reef limestone foundation, which comprises a vacuum pump and grouting machine connecting device fixedly connected to the input end of a main conveying pipeline; the output end of the main conveying pipeline is connected to a technical device at the top of the hollow steel pipe cage through a sealing joint; a novel anti-pulling anchoring device is integrated on a bottom base of the hollow steel tube cage and is formed by coaxially sleeving a hollow pressure-bearing steel tube with a telescopic supporting assembly; radial slurry outlet holes and guide sliding grooves which are distributed at equal intervals are axially formed in the pipe wall of the hollow pressure-bearing steel pipe; the outer surface of the hollow steel tube cage is coated with the magnetic conductive enhanced grid in a concentric circle structure; the composite grouting guide pipe is connected with a grouting opening in the bottom end of the hollow steel pipe cage through a rotary connector and connected to an auxiliary grouting pipeline driven by a double-liquid synchronous grouting machine through a flow divider. The distributed monitoring system, the special magnetic slurry, the microorganism slurry and the ultrasonic resonance generator are integrated in the device. The bearing capacity and stability of the seabed coral sand and reef limestone foundation can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of seabed foundation reinforcement, and in particular to a device and a construction method for reinforcing seabed coral sand and reef limestone foundations. Background Art

[0002] In the construction of marine engineering, such as offshore platforms, cross-sea bridges, submarine tunnels and other projects, submarine coral sand and reef limestone foundations are often encountered. Coral sand has the characteristics of irregular particle shape, poor gradation, and large porosity, while reef limestone foundations have problems such as uneven strength and easy breakage. It is prone to geological disasters such as settlement and sliding, which seriously affect the safe and stable operation of offshore engineering facilities. These have brought great challenges to the stability and bearing capacity of the foundation.

[0003] At present, there are limited reinforcement methods for coral sand and reef limestone foundations. Traditional foundation reinforcement methods such as pile foundations and riprap are difficult to adapt to the complex geological conditions and construction environment of the seabed. Some conventional reinforcement technologies have problems such as unsatisfactory reinforcement effects, great construction difficulty, and high costs when dealing with coral sand and reef limestone foundations, which are difficult to meet actual needs.

[0004] Therefore, a device and a construction method for reinforcing seabed coral sand and reef limestone foundations are now proposed to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a device and a construction method for reinforcing seabed coral sand and reef limestone foundations to solve the problems raised in the background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a device for reinforcing seabed coral sand and reef limestone foundations, comprising: a vacuum pump and a grouting machine assembly device, fixedly connected to the input end of the main conveying pipeline; a technical device in which the output end of the main conveying pipeline is connected to the top of the hollow steel pipe cage through a sealing joint; the bottom base of the hollow steel pipe cage is integrated with a new type of anti-pullout anchoring device, which is composed of a hollow pressure-bearing steel pipe coaxially sleeved with a retractable support component; the pipe wall of the hollow pressure-bearing steel pipe is axially provided with equidistantly distributed radial slurry holes and guide grooves; the magnetically enhanced grid is coated on the outer surface of the hollow steel pipe cage in a concentric circle structure; the composite grouting conduit is connected to the grouting port at the bottom end of the hollow steel pipe cage through a rotating joint, and is connected to the auxiliary grouting pipeline driven by the dual-liquid synchronous grouting machine through a diverter; a distributed monitoring system, a special magnetic slurry, a microbial slurry and an ultrasonic resonance generator are integrated in the device.

[0007] Preferably, the telescopic support assembly comprises a sliding sleeve, an articulated expandable support rod and a telescopic guide tube, the top of the telescopic guide tube is welded with a limited top block and the bottom is blocked; Under non-grouting conditions, the limit top block is flush with the top of the guide chute, and the expandable support rod is in a retracted state; Under grouting conditions, the slurry pressure drives the retractable support assembly to move downward along the guide chute. After the limit top block is aligned with the bottom end of the chute, the sliding sleeve triggers the expandable support rod to form a three-dimensional anchoring structure.

[0008] Preferably, the side wall of the telescopic catheter is provided with a compensating grouting hole for releasing special magnetic slurry to fill the formation cracks during the anchoring and deployment process.

[0009] Preferably, the ultrasonic resonance generator is integrated inside the hollow steel tube cage, and its frequency, power and action time are dynamically adjusted according to the porosity of the coral sand and the fluidity of the slurry.

[0010] Preferably, the magnetically conductive enhanced grid guides the directional adsorption of the special magnetic slurry through the magnetic field to form a closed reinforcement layer.

[0011] Preferably, the dual-liquid synchronous grouting machine is configured to simultaneously inject a special magnetic slurry and a microbial slurry, and the microbial slurry reacts with the coral sand to generate a carbonate cement.

[0012] Preferably, the distributed monitoring system collects pressure, displacement and slurry penetration data in real time, and adjusts the grouting parameters through feedback control.

[0013] Preferably, the radial grouting holes of the novel anti-pullout anchoring device release grouting under grouting conditions, and cooperate with the deployable support rods to enhance the anchoring stability.

[0014] In addition, the present invention also discloses a construction method for a device for reinforcing a seabed coral sand and reef limestone foundation, comprising the following steps: Step 1: Investigate the stability of the seabed foundation and design the layout of the protective device; Step 2: bury the hollow steel pipe cage in the target foundation to wrap the area to be reinforced; Step 3: Pour special magnetic slurry into the hollow steel pipe cage and adsorb it on the magnetic enhancement grid to form a closed environment; Step 4: After evacuating to a predetermined vacuum degree, a special magnetic slurry and a microbial slurry are simultaneously injected to fill the pores and generate cementing substances; Step 5: Start the ultrasonic resonance generator to promote the reaction, and let it stand to solidify; Step 6: Monitor and adjust reinforcement parameters in real time through the distributed monitoring system.

[0015] Furthermore, nanomaterials are added to the slurry during the grouting process. The nanomaterials include nanoclay or nanosilica, and the amount added is optimized according to the reinforcement requirements; the vacuum degree, grouting rate and slurry composition are dynamically adjusted according to the differences in the formations.

[0016] The present invention has the following beneficial effects: 1. The present invention designs a special reinforcement device and construction method based on the characteristics of submarine coral sand and reef limestone foundations, which can effectively improve the bearing capacity and stability of the foundation and meet the needs of marine engineering construction; 2. The present invention ensures the quality and reliability of the foundation reinforcement project through detailed construction preparation, standardized construction steps and strict quality inspection and acceptance; 3. The present invention optimizes the structural layout of the device, and the connection of each part of the reinforcement device is tight and reasonable, which improves the overall stability and reliability. It maximizes the function in a limited space, facilitates installation and operation in the narrow and complex environment of the seabed, and improves the convenience and efficiency of construction; 4. The present invention has adopted perfect construction safety and environmental protection measures, which not only ensures the safety of construction workers, but also reduces the impact on the marine ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a plan view of the overall device involved in the present invention; Figure 2 It is a schematic diagram of the non-grouting working condition of the anchoring device involved in the present invention; Figure 3 It is a schematic diagram of the grouting working condition of the anchoring device involved in the present invention; Figure 4 It is a partial cross-sectional view of the anchoring device involved in the present invention; Figure 5 This is a schematic diagram of a retractable support assembly involved in the present invention; Figure numerals: vacuum pump and grouting machine assembly device 1, main conveying pipeline 2, technical device 3, new anti-pullout anchoring device 4, composite grouting catheter 5, auxiliary grouting pipeline 6, dual-liquid synchronous grouting machine 7, distributed monitoring system 8, hollow steel pipe cage 9, special magnetic slurry 10, microbial slurry 11, ultrasonic resonance generator 12, hollow pressure-bearing steel pipe 41, retractable support assembly 42, radial slurry outlet hole 411, guide slide 412, limiting top block 421, sliding sleeve 422, expandable support rod 423, retractable catheter 424. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: See also Figures 1 to 5In this embodiment, a device for reinforcing the foundation of coral sand and reef limestone on the seabed comprises: a vacuum pump and grouting machine assembly device 1, which is fixedly connected to the input end of the main conveying pipeline 2 through a flange interface; the output end of the main conveying pipeline 2 is connected to the technical device 3 on the top of the hollow steel pipe cage 9 through a sealing joint; the bottom base of the hollow steel pipe cage 9 is integrated with a new type of anti-pullout anchoring device 4, which is composed of a hollow pressure-bearing steel pipe 41 coaxially sleeved with a retractable support component 42; the pipe wall of the hollow pressure-bearing steel pipe 41 is axially provided with equidistantly distributed radial slurry holes 411 and guide grooves 412; the magnetic conductive enhancement grid 8 is coated on the outer surface of the hollow steel pipe cage 9 in a concentric circle structure; the composite grouting conduit 5 is connected to the grouting port at the bottom end of the hollow steel pipe cage 9 through a rotary joint, and is connected to the auxiliary grouting pipeline 6 driven by the dual-liquid synchronous grouting machine 7 through a diverter; a distributed monitoring system 8, a special magnetic slurry 10, a microbial slurry 11 and an ultrasonic resonance generator 12 are integrated in the device. This embodiment includes three stages: vacuum grouting stage: start the vacuum pump to suck the air and moisture in the steel pipe cage to form a negative pressure environment, and then inject magnetic slurry and microbial slurry into the composite grouting conduit 5 through the dual-liquid synchronous grouting machine 7; dynamic anchoring stage: the slurry pressure drives the retractable support assembly 42 to expand, and cooperates with the magnetic grid to form a three-dimensional anchoring structure; intelligent control: the distributed monitoring system 8 adjusts the grouting rate and ultrasonic parameters in real time to ensure the reinforcement effect.

[0019] Preferably, the telescopic support assembly 42 comprises a sliding sleeve 422, an articulated expandable support rod 423 and a telescopic guide tube 424, the top of the telescopic guide tube 424 is welded with a limited top block 421, and the bottom is blocked; Under non-grouting conditions, the limiting top block 421 is flush with the top of the guide chute 412, and the expandable support rod 423 is in a retracted state; Under grouting conditions, the slurry pressure drives the telescopic support assembly 42 to move down along the guide slot 412. After the limit top block 421 is aligned with the bottom end of the slot, the sliding sleeve 422 triggers the deployable support rod 423 to form a three-dimensional anchoring structure. In this embodiment, the telescopic support assembly 42 includes: the sliding sleeve 422 is sleeved on the outer wall of the telescopic guide tube 424, and is connected to the deployable support rod 423 through a hinge mechanism; the limit top block 421 is welded to the top of the telescopic guide tube 424, and is flush with the top of the guide slot 412 when not grouting, and moves down to trigger the support rod to be deployed during grouting; under non-grouting conditions: the support rod 423 is retracted, the device is buried in the formation, and the formation reaction force is transmitted to the steel pipe cage through the limit top block 421; under grouting conditions: the slurry pressure drives the telescopic guide tube 424 to move down along the guide slot 412, and the sliding sleeve 422 triggers the support rod 423 to be deployed, forming an anchor claw structure to enhance the pull-out resistance.

[0020] Preferably, the side wall of the telescopic guide tube 424 is provided with a compensating grouting hole 425 for releasing the special magnetic slurry 10 to fill the stratum cracks during the anchoring and deployment process. When the support rod 423 is deployed, the compensating grouting hole 425 moves with the telescopic guide tube 424, continuously releasing the magnetic slurry to penetrate the coral sand pores and prevent the stratum from loosening.

[0021] Preferably, the ultrasonic resonance generator 12 is integrated inside the hollow steel tube cage 9, and its frequency, power and action time are dynamically adjusted according to the porosity of the coral sand and the fluidity of the slurry. For high-porosity coral sand, the ultrasonic frequency is increased, such as 20-50kHz, to enhance slurry penetration; for high-viscosity slurry, the power is increased, such as 500W-1kW, to promote mixing reaction.

[0022] Preferably, the magnetic enhancement grid 8 guides the special magnetic slurry 10 to be oriented and adsorbed through the magnetic field to form a closed reinforcement layer. When the magnetic grid 8 is powered on, an alternating magnetic field is generated, and the magnetic slurry containing ferrite particles is distributed along the magnetic flux lines, filling the gaps in the coral sand to form a dense reinforcement layer.

[0023] Preferably, the dual-liquid synchronous grouting machine 7 is configured to synchronously inject the special magnetic slurry 10 and the microbial slurry 11, and the microbial slurry 11 reacts with the coral sand to form carbonate cement. The microbial slurry containing Bacillus pasteurianus reacts with the calcium ions in the coral sand to form calcium carbonate precipitation, which can improve the foundation strength.

[0024] Preferably, the distributed monitoring system 8 collects pressure, displacement and grout penetration data in real time, and adjusts the grouting parameters through feedback control. The pressure sensor monitors the grouting pressure, the displacement sensor detects the anchor displacement, and the system dynamically adjusts the grouting rate through the PID algorithm.

[0025] Preferably, the radial grouting holes 411 of the novel anti-pullout anchoring device 4 release grout under grouting conditions, and cooperate with the deployable support rods 423 to enhance the anchoring stability. During grouting, the grout diffuses to the surroundings through the radial grouting holes 411, and together with the deployed support rods 423, forms a "grout-mechanical" composite anchoring structure, and the pullout resistance is increased by more than 40%.

[0026] In addition, the present invention also discloses a construction method for a device for reinforcing a seabed coral sand and reef limestone foundation, comprising the following steps: Step 1: Investigate the stability of the seabed foundation and design the layout of the protective device; Step 2: bury the hollow steel pipe cage 9 in the target foundation to wrap the area to be reinforced; Step 3: Pour special magnetic slurry 10 into the hollow steel tube cage 9, and adsorb it on the magnetic enhancement grid 8 to form a closed environment; Step 4: After evacuating to a predetermined vacuum degree, the specially prepared magnetic slurry 10 and the microbial slurry 11 are simultaneously injected to fill the pores and generate cementing substances; Step 5: Start the ultrasonic resonance generator 12 to promote the reaction, and let it stand to solidify; Step 6: Monitor and adjust reinforcement parameters in real time through the distributed monitoring system 8.

[0027] Furthermore, nanomaterials are added to the slurry during the grouting process. The nanomaterials include nanoclay or nanosilica, and the amount added is optimized according to the reinforcement requirements; the degree of vacuuming, grouting rate and slurry composition are dynamically adjusted according to the formation differences. In this embodiment, 5%-10% nanosilica is first added to the slurry to fill the micron-level pores and improve the impermeability by 50%; for reef limestone, the grouting rate is reduced, such as 0.5L / min, and the vacuum degree is increased to -100kPa.

[0028] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A device for reinforcing seabed coral sand and reef limestone foundations, characterized in that: include: The vacuum pump and grouting machine assembly device is fixedly connected to the input end of the main conveying pipeline; the output end of the main conveying pipeline is connected to the technical device on the top of the hollow steel pipe cage through a sealing joint; The bottom base of the hollow steel pipe cage is integrated with a new type of anti-pullout anchoring device, which is composed of a hollow pressure-bearing steel pipe coaxially sleeved with a retractable support component; the pipe wall of the hollow pressure-bearing steel pipe is axially provided with equidistantly distributed radial slurry holes and guide grooves; the magnetic enhancement grid is coated on the outer surface of the hollow steel pipe cage in a concentric circle structure; the composite grouting conduit is connected to the grouting port at the bottom end of the hollow steel pipe cage through a rotating joint, and is connected to the auxiliary grouting pipeline driven by a dual-liquid synchronous grouting machine through a diverter; a distributed monitoring system, special magnetic slurry, microbial slurry and an ultrasonic resonance generator are integrated in the device.

2. The device for reinforcing the seabed coral sand and reef limestone foundation according to claim 1, characterized in that: The telescopic support assembly includes a sliding sleeve, an articulated expandable support rod and a telescopic guide tube, the top of the telescopic guide tube is welded with a limited top block, and the bottom is blocked; Under non-grouting conditions, the limit top block is flush with the top of the guide chute, and the expandable support rod is in a retracted state; Under grouting conditions, the slurry pressure drives the retractable support assembly to move downward along the guide chute. After the limit top block is aligned with the bottom end of the chute, the sliding sleeve triggers the expandable support rod to form a three-dimensional anchoring structure.

3. The device for reinforcing seabed coral sand and reef limestone foundation according to claim 2, characterized in that: The side wall of the telescopic guide tube is provided with compensating grouting holes, which are used to release special magnetic slurry to fill the formation cracks during the anchoring and deployment process.

4. The device for reinforcing seabed coral sand and reef limestone foundation according to claim 1, characterized in that: The ultrasonic resonance generator is integrated inside the hollow steel tube cage, and its frequency, power and action time are dynamically adjusted according to the porosity of the coral sand and the fluidity of the slurry.

5. The device for reinforcing seabed coral sand and reef limestone foundation according to claim 1, characterized in that: The magnetically enhanced grid guides the directional adsorption of special magnetic slurry through the magnetic field to form a closed reinforcement layer.

6. The device for reinforcing seabed coral sand and reef limestone foundation according to claim 1, characterized in that: The dual-liquid synchronous grouting machine is configured to simultaneously inject special magnetic slurry and microbial slurry. The microbial slurry reacts with coral sand to form carbonate cement.

7. The device for reinforcing seabed coral sand and reef limestone foundation according to claim 1, characterized in that: The distributed monitoring system collects pressure, displacement and slurry penetration data in real time, and adjusts the grouting parameters through feedback control.

8. The device for reinforcing seabed coral sand and reef limestone foundation according to claim 1, characterized in that: The radial grouting holes of the new anti-pullout anchoring device release slurry under grouting conditions, and work together with the deployable support rods to enhance the anchoring stability.

9. A construction method for a device for reinforcing seabed coral sand and reef limestone foundation according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Investigate the stability of the seabed foundation and design the layout of the protective device; Step 2: bury the hollow steel pipe cage in the target foundation to wrap the area to be reinforced; Step 3: Pour special magnetic slurry into the hollow steel pipe cage and adsorb it on the magnetic enhancement grid to form a closed environment; Step 4: After evacuating to a predetermined vacuum degree, a special magnetic slurry and a microbial slurry are simultaneously injected to fill the pores and generate cementing substances; Step 5: Start the ultrasonic resonance generator to promote the reaction, and let it stand to solidify; Step 6: Monitor and adjust reinforcement parameters in real time through the distributed monitoring system.

10. The construction method of the device for reinforcing the seabed coral sand and reef limestone foundation according to claim 9, characterized in that: Nanomaterials are added to the slurry during the grouting process. The nanomaterials include nanoclay or nanosilica, and the amount added is optimized according to the reinforcement requirements; the vacuum degree, grouting rate and slurry composition are dynamically adjusted according to the differences in the formations.

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