Intelligent control method and system for grouting reinforcement and deviation rectification of building foundation

Abstract

The invention relates to the technical field of constructional engineering, in particular to an intelligent control method and system for grouting reinforcement and deviation rectification of a building foundation, and the control method comprises the following steps: planning grouting hole positions, and distributing holes below a reinforcement ground; determining the hole depth and the hole diameter; the grouting sequence is controlled, and grouting is conducted in three stages according to the principle that outer holes are firstly formed and then inner holes are formed, hole jumping intervals are formed, and settlement areas are preferential; gradient control is conducted on the slurry concentration while grouting is conducted, and the slurry concentration is dynamically adjusted according to the slurry filling stage; the grouting pressure and the grouting amount are coordinated, and stepped pressurization of the grouting pressure is controlled by stages; the single-hole grouting amount is determined according to the soil gap ratio and the settlement difference, and the grouting amount is adjusted in real time according to the monitored deformation and grout diffusion conditions; intelligent monitoring and regulation are achieved, and grouting parameters are fed back and adjusted in real time according to monitoring data. The method is stable in reinforcing effect, meanwhile, the grouting sequence is optimized, the project period is shortened, local precise lifting is achieved, structural damage is avoided, and the method is suitable for being used in complex stratums.

Description

Technical Field

[0001] This invention belongs to the field of building engineering technology, and specifically relates to an intelligent control method and system for grouting reinforcement and correction of building foundations. Background Technology

[0002] With the continuous advancement of urbanization and economic development, people have increasingly higher requirements for the safety and comfort of buildings, providing a broad market space for the foundation reinforcement and correction industry. Currently, traditional grouting reinforcement technology suffers from problems such as single grouting parameters, low correction accuracy, and susceptibility to secondary settlement. Furthermore, existing technologies lack scientific basis for grouting hole placement and grouting sequence, and the adjustment of grout concentration and pressure relies on experience, leading to unstable reinforcement effects. Therefore, a new foundation grouting reinforcement method and system is needed to solve these problems. Summary of the Invention

[0003] To address the problems in existing technologies, this invention proposes an intelligent control method and system for grouting reinforcement and correction of building foundations, in order to solve the problem of unstable reinforcement effects in current building foundations.

[0004] The objective of this invention and the technical problem it solves are achieved through the following technical solution. According to this invention, an intelligent control method for grouting reinforcement and correction of building foundations includes the following steps: S1, plan the grouting hole locations, generate a three-dimensional mesh of grouting hole locations based on ground radar, building BIM model and structural load distribution, and lay out the holes underground for reinforcement. S2, determine the hole depth and diameter, select the hole depth coefficient based on the standard penetration N value of soil and rock mass and the RQD index of rock mass, and select the hole depth and diameter; S3, control the grouting sequence, follow the principle of external holes first then internal holes, skip-hole intervals, and priority for settlement zones, and carry out grouting in three stages; S4. During grouting, the grout concentration is controlled in a gradient manner, and the grout concentration is dynamically adjusted according to the grout filling stage. S5, the grouting pressure and grouting volume are coordinated, and the grouting pressure is increased stepwise in stages; the grouting volume per hole is determined according to the soil void ratio and settlement difference, and the grouting volume is adjusted in real time according to the monitored deformation and grout diffusion. S6 features intelligent monitoring and control. Deformation monitoring points are set up on the exterior walls of buildings and in elevator lobbies to monitor building settlement and tilt rate changes. Miniature sensors are implanted in the soil to monitor the grout diffusion trajectory and adjust grouting parameters in real time based on the monitoring data.

[0005] Furthermore, in step S1, the grouting holes adopt a composite arrangement pattern of first arranging the outer ring, then arranging the inner ring, and then arranging the holes in the settlement core area. The outer ring holes are distributed in a plum blossom pattern along the edge of the foundation, the inner ring holes are densely arranged around the settlement core area, and radial inclined holes are added in the settlement core area.

[0006] Furthermore, in step S2, the hole depth needs to extend 1-2m below the bearing layer.

[0007] Furthermore, in step S3, the outer ring holes need to be grouted with skip grouting, with two holes spaced apart between adjacent grouting holes; the inner ring holes are grouted symmetrically; and the inclined holes are periodically and directionally grouted at intervals.

[0008] Furthermore, in step S4, the water-cement ratio at the initial penetration of the grout is 1, which is gradually adjusted to 0.6 according to the filling stage. Each grouting hole is adjusted in 3 levels, with each level increasing by 0.2.

[0009] Furthermore, in step S5, the initial grouting pressure is 0.3 MPa, and the pressure is increased in steps of 0.1 MPa / 5 min, with the upper limit of the grouting pressure being 1.5 MPa.

[0010] Furthermore, in step S6, the building tilt rate is monitored by fiber optic grating sensors installed at the corners of the building walls and in the elevator shaft, and the building settlement rate is monitored by laser settlement meters.

[0011] An intelligent control system for grouting reinforcement and correction of building foundations includes: a data acquisition module, a risk warning module, and a digital control module.

[0012] Furthermore, the data acquisition module includes: a geological sensing sensor for real-time acquisition of soil and rock parameters; a status detection sensor for monitoring the dynamic information of building deformation; and a grout parameter sensor for real-time adjustment of grouting volume.

[0013] Furthermore, the digital control module includes: a BIM load mapping module for visualizing the building load distribution; a slurry diffusion simulation module for real-time display of slurry vein radius; and an early warning dashboard module for automatically marking tilt over-limit zones.

[0014] In summary, the present invention has the following advantages: 1. Real-time measurement is achieved through intelligent monitoring and control, with settlement and correction accuracy reaching ±2mm, which is 60% higher than traditional methods, and the reinforcement effect is stable.

[0015] 2. The grouting slurry is controlled in stages and dynamically adjusted, which can save 30% of grouting materials and optimize the grouting sequence, thus shortening the project time.

[0016] 3. By precisely controlling 8 indicators, directional grouting achieves localized and precise lifting, avoiding structural damage, and is suitable for use in complex strata.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram illustrating the implementation process of an intelligent control method and system for grouting reinforcement and correction of building foundations according to the present invention. Detailed Implementation

[0019] The technical solution of the present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0020] An intelligent control system for grouting reinforcement and correction of building foundations includes: a data acquisition module, comprising a geological sensing sensor for real-time acquisition of soil and rock parameters, a state detection sensor for monitoring dynamic information of building deformation, and a grout parameter sensor for real-time adjustment of grouting volume; the geological sensing sensor includes a three-dimensional ground-penetrating radar for detecting cavity accuracy, an in-hole CT scanner for detecting fracture resolution, and a standard penetration tester for acquiring N-values; the state detection sensor includes a fiber optic grating sensor array for detecting strain accuracy, an inclination sensor, and a laser settlement meter; the grout parameter sensor includes a three-parameter integrated probe (pressure / flow / viscosity), a conductivity meter, and an ultrasonic flow meter. The risk warning module monitors the tilt rate and uplift rate. When the tilt rate exceeds 0.05% or the uplift exceeds 2mm, an alarm is triggered, and the speed is reduced by 30%. When the micro-vibration energy exceeds 10... 3 When J is triggered, an alarm is activated, and adjacent hole compensation is initiated. It also includes a digital control module consisting of a BIM load mapping module for visualizing building load distribution, a slurry diffusion simulation module for real-time display of slurry vein radius, and an early warning signboard module for automatically marking tilt over-limit areas. The BIM mapping module is used for generating load heat maps and three-dimensional mapping of underground pipe networks, and its model deviation from reality is less than or equal to 3cm; the slurry diffusion simulation module displays and predicts the diffusion radius in real time; the early warning signboard module uses three colors—red, yellow, and green—to distinguish different tilt over-limit areas, with red areas being processed first.

[0021] An intelligent control method for foundation grouting reinforcement and deviation correction of buildings includes the following steps: S1. Planning grouting hole locations: Based on ground-penetrating radar, building BIM model, and structural load distribution, a three-dimensional grid of grouting hole locations is generated. Holes are then laid out below the reinforcement site to accurately locate the areas requiring reinforcement, ensuring that the grout can effectively cover the target body and avoid omissions or over-grouting. The grouting hole locations adopt a composite layout pattern of first arranging the outer ring, then the inner ring, and finally the holes in the settlement core area. The outer ring holes are distributed in a quincunx pattern along the foundation edge, while the inner ring holes are densely arranged around the settlement core area. Radial inclined holes are added in the settlement core area.

[0022] S2. Determine the hole depth and diameter. Select the hole depth coefficient based on the standard penetration depth (N) of the soil and rock mass and the rock mass RQD index. Generally, when N is less than 5 or RQD is less than 25%, K is 1.5; when N is less than or equal to 15 but greater than or equal to 5 or RQD is less than or equal to 75% but greater than or equal to 25%, K is 1.2; when N is greater than 30 or RQD is greater than 75%, K is 0.8. Thus, select the hole depth and diameter. In this embodiment, the outer ring hole diameter is 80mm, the inner ring hole diameter is 60mm, and the inclined hole diameter is 50mm. At the same time, the hole depth needs to penetrate 1-2m below the bearing layer (dynamically adjusted).

[0023] S3, control the grouting sequence, follow the principle of grouting the outer holes first and then the inner holes, skipping holes, and prioritizing the settlement zone, and carry out grouting in three stages; the outer ring holes need to be grouted by skipping holes, with two holes between adjacent grouting holes; the inner ring holes are grouted symmetrically; the inclined holes are periodically and directionally replenished with grout; at the same time, the low load area is constructed before the high load area.

[0024] S4. During grouting, the grout concentration is controlled in a gradient manner, and the grout concentration is dynamically adjusted according to the grout filling stage. The water-cement ratio at the initial infiltration of the grout is 1, and it is gradually adjusted to 0.6 according to the filling stage. Each grouting hole is adjusted in 3 levels, with each level increasing by 0.2. During the grouting process, the formation grout intake is judged according to the changes in pressure and flow rate, and the grout concentration is dynamically adjusted. Water-reducing agents can also be used to improve fluidity, quick-setting agents to control gel time, expansion agents to compensate for shrinkage, and thickeners to reduce fluidity (for large fractures or flowing water).

[0025] S5, grouting pressure and grouting volume are coordinated, with phased pressure increases. The grouting volume per hole is determined based on the soil void ratio and settlement difference. The grouting volume is adjusted in real time based on monitored deformation and grout diffusion. Sufficient grout is injected to fill the target voids or reinforced area, achieving the designed solidification volume ratio or replacement rate, avoiding insufficient injection. In actual grouting, reaching the designed final pressure and a significant decrease in grout absorption rate (flow rate) to a stable low value for a certain period can be used as one of the main criteria for ending grouting for that hole / section. The initial grouting pressure is 0.3 MPa, increasing in steps of 0.1 MPa / 5 min, with an upper limit of 1.5 MPa. Grouting pressure is the most important real-time control indicator. A sudden increase in pressure may indicate blockage or reaching the designed diffusion range; no increase in pressure may indicate grout leakage or large cracks. Flow rate, concentration, or grouting suspension may be necessary based on pressure changes.

[0026] The S6 system features intelligent monitoring and control. Deformation monitoring points are installed on the building's exterior walls and elevator lobbies to monitor building settlement and tilt changes. Miniature sensors are implanted in the soil to monitor the grout diffusion trajectory, and grouting parameters are adjusted in real time based on the monitoring data. Fiber optic grating sensors installed at building corners and elevator lobbies monitor building tilt, and laser settlement meters monitor building settlement. By comprehensively and in real-time sensing the grouting process and reinforcement effect, the system provides a scientific basis for dynamically adjusting the first seven indicators, enabling refined and information-based construction, ensuring quality and safety, and providing convenient data reference for subsequent acceptance work.

[0027] The above description is merely a preferred embodiment of the present invention. Any simple modifications, equivalent changes, and alterations made by those skilled in the art to the above embodiments without departing from the scope of the present invention and based on the technical essence of the present invention shall still fall within the scope of the present invention.

Claims

1. An intelligent control method for grouting reinforcement and correction of building foundations, characterized in that: Includes the following steps: S1, plan the grouting hole locations, generate a three-dimensional mesh of grouting hole locations based on ground radar, building BIM model and structural load distribution, and arrange the holes below the reinforced ground; S2, determine the hole depth and diameter, select the hole depth coefficient based on the standard penetration N value of soil and rock mass and the RQD index of rock mass, and select the hole depth and diameter; S3, control the grouting sequence, follow the principle of external holes first then internal holes, skip-hole intervals, and priority for settlement zones, and carry out grouting in three stages; S4. During grouting, the grout concentration is controlled in a gradient manner, and the grout concentration is dynamically adjusted according to the grout filling stage. S5, the grouting pressure and grouting volume are coordinated, and the grouting pressure is increased stepwise in stages; the grouting volume per hole is determined according to the soil void ratio and settlement difference, and the grouting volume is adjusted in real time according to the monitored deformation and grout diffusion. S6 features intelligent monitoring and control. Deformation monitoring points are set up on the exterior walls of buildings and in elevator lobbies to monitor building settlement and tilt rate changes. Miniature sensors are implanted in the soil to monitor the grout diffusion trajectory and adjust grouting parameters in real time based on the monitoring data.

2. The intelligent control method for grouting reinforcement and correction of building foundations according to claim 1, characterized in that: In step S1, the grouting holes adopt a composite arrangement pattern of first arranging the outer ring, then arranging the inner ring, and then arranging the holes in the settlement core area. The outer ring holes are distributed in a plum blossom pattern along the edge of the foundation, the inner ring holes are densely arranged around the settlement core area, and radial inclined holes are added in the settlement core area.

3. The intelligent control method for grouting reinforcement and correction of building foundations according to claim 1, characterized in that: In step S2, the hole depth needs to extend 1-2m below the bearing layer.

4. The intelligent control method for grouting reinforcement and correction of building foundations according to claim 1, characterized in that: In step S3, the outer ring holes need to be grouted with skip grouting, with two holes spaced apart between adjacent grouting holes; the inner ring holes are grouted symmetrically; and the inclined holes are periodically and directionally grouted at intervals.

5. The intelligent control method for grouting reinforcement and correction of building foundations according to claim 1, characterized in that: In step S4, the water-cement ratio of the grout during initial penetration is 1, which is gradually adjusted to 0.6 according to the filling stage. Each grouting hole is adjusted in 3 levels, with each level increasing by 0.

2.

6. The intelligent control method for grouting reinforcement and correction of building foundations according to claim 1, characterized in that: In step S5, the initial grouting pressure is 0.3 MPa, and the pressure is increased in steps of 0.1 MPa / 5 min, with the upper limit of the grouting pressure being 1.5 MPa.

7. The intelligent control method for grouting reinforcement and correction of building foundations according to claim 1, characterized in that: In step S6, the building tilt rate is monitored by fiber optic grating sensors installed at the corners of the building walls and in the elevator shaft, and the building settlement rate is monitored by laser settlement meters.

8. An intelligent control system for grouting reinforcement and correction of building foundations, characterized in that, include: Data acquisition module, risk warning module, and digital control module.

9. The intelligent control system for grouting reinforcement and correction of building foundations according to claim 8, characterized in that: The data acquisition module includes: a geological sensing sensor for real-time acquisition of soil and rock parameters; a status detection sensor for monitoring the dynamic information of building deformation; and a grout parameter sensor for real-time adjustment of grouting volume.

10. The intelligent control system for grouting reinforcement and correction of building foundations according to claim 8, characterized in that: The digital control module includes: a BIM load mapping module for visualizing building load distribution; a slurry diffusion simulation module for real-time display of slurry vein radius; and an early warning dashboard module for automatically marking tilt over-limit zones.

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