High-pressure jet grouting pile body leakage point detection device and detection method, and operation method

Abstract

Disclosed in the present invention are a high-pressure jet grouting pile body leakage point detection device and detection method, and an operation method. The detection method comprises: when a high-pressure jet grouting pile starts to construct, as the pile body goes deep into soil, periodically acquiring the soil porosity, the soil particle distribution uniformity, the soil permeability, the soil moisture content, the soil particle size, and the area of the pore structure of the soil, and calculating the impermeability of the soil; acquiring the pore structure of a pile body material, the permeability of the pile body material, the compressive strength of the pile body material, and the corrosion degree of the surface of the pile body, and calculating the impermeability of the pile body material; and acquiring the diameter of the pile body, the length of the pile body, the water flow rate during construction of the high-pressure jet grouting pile, the construction speed of the high-pressure jet grouting pile, a change value of pressure around the pile body as the pile body going deep into the soil, the construction time, the pH value of the soil, the temperature of the soil, and the inclination angle of the pile body, configuring a pile body leakage point detection model on the basis of the impermeability of the soil and the impermeability of the pile body material, and calculating the index of occurrence of the leakage point of the pile body in each period, thus detecting the leakage point of the pile body.

Description

A high-pressure jet grouting pile body leakage point detection device, operation method and detection method Technical Field

[0001] The present invention belongs to the technical field of high-pressure rotary jet grouting pile body leakage point detection, and more specifically, relates to a high-pressure rotary jet grouting pile body leakage point detection device, an operation method and a detection method. Background Art

[0002] High-pressure jet jet piles are constructed by using a drilling rig to drill a grouting pipe with a special nozzle to a predetermined position in the soil layer. A high-pressure pulse pump is then used to spray cement slurry horizontally into the soil at high speed in all directions through a spray device at the lower end of the drill pipe. Because the drill pipe is gradually lifted and rotated at a certain speed, the slurry ejected at high pressure has great kinetic energy, generating a high-speed, high-pressure jet stream. This high-pressure jet stream can displace a large amount of weak layers and compact the soil around the pile, allowing the gravel cushion layer or clay and cement slurry to fully mix, bond, and harden, consolidating them into a single entity. In this way, a high-strength cement-soil pile is formed in the foundation, achieving the goals of improving soil quality, increasing foundation strength, reducing soil compression deformation, and improving the foundation's anti-seepage performance. However, this method can also present some problems when dealing with silty clay, clay, and silty soils. For example, silty clay and clay have relatively large cohesion and strong viscosity. During construction, it is often found that the mixing uniformity of cement and soil in mixing piles is poor, and there is separation of cement and clay. The final composite foundation has uneven permeability and reduced impermeability. Silt soil has a high water content and slightly poor compatibility with cement slurry. During construction, there is separation of cement and soil, which ultimately leads to reduced impermeability. In some application scenarios, the impermeability of the composite foundation is crucial to ensuring structural safety. Therefore, it is necessary to accurately test the permeability of the treated composite foundation.

[0003] Currently, permeability testing for high-pressure jet grouting piles is primarily divided into two categories: indoor and field testing. Indoor testing typically involves taking columnar samples on-site and conducting variable-head permeability tests. However, the sampling process can disturb the sample, leading to deviations between the test data and actual field data. Furthermore, localized samples are not representative of the entire stratum. Therefore, when conditions permit, field permeability tests are often conducted within the pile borehole. Field testing typically utilizes borehole oscillation micro-water testing in accordance with relevant standards. However, this standard method cannot accurately measure stratum permeability coefficients based on stratum variations, leading researchers to attempt to improve upon it. Prior to the present invention, an invention patent (authorization number: CN 103091229 B) disclosed a variable-head segmented permeability coefficient measurement device and method. After using inflatable plugs to seal the upper and lower ends of a soil layer in a borehole, a precipitation head micro-water test was used to measure the permeability coefficient. Compared with the water pressure test device, this device omits the high-pressure water injection device, has a simple structure and low cost. However, when testing the permeability coefficient of the high-pressure jet grouting pile body, this patent fails to consider the possibility of local through-hole leakage points due to the uneven mixing of cement slurry and original soft soil, resulting in an excessively large measured on-site permeability coefficient, distorted data, and reduced economic efficiency of the design scheme. The invention patent (authorization number: CN 102721634 B) discloses an in-situ permeability test method and test device for borehole pressure injection. A sealing plug is set between the inner wall of the borehole and the water injection pipe, so that the section from below the sealing plug to the bottom of the borehole forms a closed test section. The permeability test is then carried out in a manner similar to the constant head test. This invention can be used to test foundation structures with a small permeability coefficient and provide a head pressure that meets the requirements. However, this method takes a long time to test and can only test the permeability coefficient below the plug. It cannot test in sections and cannot consider the distortion of the permeability coefficient caused by local leakage points. The invention patent (publication number: CN 102621002 A) discloses a field test system for the seepage and pressure-deformation coupling characteristics of fractured rock mass. Sealing capsules are filled at both ends of the test section in the borehole. A pressure sensor is provided in the high-pressure water pump pipe and connected to the sealing capsule. The sealing capsule is pressurized to make the sealing capsule tightly combined with the hole wall to achieve sealing in the test section. The pressure water pump pipe is provided with a flow sensor and a pressure sensor. The high-pressure water pump performs a flow and high-pressure hydraulic test on the test section in the borehole through the drill pipe to test the seepage characteristics of the fractured rock mass. Similar to the above patent, this patent also sets seals at both ends of the borehole test section. The difference is that the high-pressure water pressure test is performed in the test section, which can accelerate the test speed. However, this method cannot take into account the permeability coefficient deviation caused by local leakage points of the high-pressure rotary jet pile body.

[0004] Summary of the Invention

[0005] In order to solve the above technical problems, the present invention proposes a leakage point detection device for a high-pressure rotary jet pile, comprising: a leakage point detection system and a leakage point repair system;

[0006] The leakage point detection system comprises: a borehole endoscope display (1) for recording the water seepage condition of the inner wall of the borehole in real time; a winding wheel (2) for retracting and extending the communication optical cable (4) up and down; a guide wheel (5) for ensuring that the guide wheel is tightly connected to the hole wall of the high-pressure rotary jet pile (3) when the high-definition wide-angle camera (8) slides up and down, and connected to the connecting rod (6) through a spring; an LED lighting lamp (7) and a high-definition wide-angle camera (8) are fixed to the lower part of the connecting rod (6), and the upper part is connected to the communication optical cable (4); the LED lighting lamp (7) is used to provide light to the pile body borehole of the high-pressure rotary jet pile (3), so as to facilitate the high-definition wide-angle camera (8) to record;

[0007] The leakage point repair system comprises: a pressure grouting pump (9), a leakage point repair grouting material (10), a pressure gauge (11), a hose reel (12), a pressure grouting pipe (13), a micro electric motor (14), a spraying column (15), and a brush (16).

[0008] The present invention also provides an operating method of a high-pressure jet grouting pile body leakage detection device, comprising:

[0009] Step 1: Before detection, first use a drilling rig to drill a hole in the pile body of the high-pressure rotary jet pile (3). After the drilling rig cleans the hole, use a centrifugal pump to extract the water in the hole, and then start leak detection. Fix a winding wheel (2) at the edge of the hole, put a high-definition wide-angle camera (8), an LED lighting lamp (7), a connecting rod (6), a guide wheel (5) and a communication optical cable on its upper part into the hole in turn, and lower them to the bottom of the hole. Mark the communication optical cable (4) at a certain length, turn on the LED lighting lamp (7) and the borehole endoscope display (1), and slowly and uniformly pull the communication optical cable (4) upward from the bottom of the hole. When a water seepage point is found on the inner wall of the hole, record the depth position on the communication optical cable (4), and take a photo through the borehole endoscope display (1) until it is lifted to the top of the hole, determine the depth of each leak point, analyze and evaluate the leakage degree of the hole wall, and determine the duration of the grouting.

[0010] Step 2: Repairing the leakage point, firstly, the hose reel (12) is placed just above the high-pressure rotary jet pile (3) pile body borehole, then the pressure grouting pipe (13), the micro electric motor (14), the grouting column (15), and the brush (16) are slowly lowered to the bottom of the high-pressure rotary jet pile (3) pile body borehole, and then slowly lifted to the detected leakage point, the pressure grouting pump (9) switch is turned on, and the leakage point repair grouting material (10) is sprayed on the inner wall of the high-pressure rotary jet pile (3) pile body borehole; the micro electric motor (14) switch is turned on, the brush (16) rotates and evenly spreads the leakage point repair grouting material (10) sprayed on the inner wall of the borehole to achieve leakage point blocking; then the pressure grouting pipe (13) is lifted, and the detected leakage points are repaired in sequence.

[0011] The present invention also proposes a method for detecting leakage points in a high-pressure jet grouting pile body in conjunction with the above device, comprising:

[0012] When high-pressure jet grouting pile construction begins, as the pile body penetrates deeper into the soil, soil porosity, soil particle distribution uniformity, soil permeability, soil water content, soil particle size, and the area of ​​soil pore structure are obtained periodically to calculate the soil's impermeability.

[0013] At the same time, the pore structure of the pile material, the permeability of the pile material, the compressive strength of the pile material and the corrosion degree of the pile surface are obtained to calculate the impermeability of the pile material;

[0014] The diameter of the pile body, the length of the pile body, the water flow rate during the construction of the high-pressure rotary jet pile, the construction speed of the high-pressure rotary jet pile, the pressure change value around the pile body as the pile body penetrates into the soil, the construction time, the pH value of the soil, the temperature of the soil and the inclination angle of the pile body are obtained. According to the impermeability of the soil and the impermeability of the pile material, a pile leakage detection model is set up, and the index of pile leakage in each cycle is calculated to detect the pile leakage.

[0015] Furthermore, the pile leakage detection model includes:

[0016] Among them, P is the index of pile leakage, A is the soil impermeability, B is the pile material impermeability, C is the pile diameter, D is the pile length, E is the water flow rate during high-pressure rotary jet grouting construction, K is the construction speed of high-pressure rotary jet grouting, M is the pressure change around the pile as the pile penetrates deeper into the soil, F is the construction time, I is the soil pH value, L is the soil temperature, and J is the inclination angle of the pile.

[0017] Furthermore, the soil impermeability A includes:

[0018] Among them, a is the first adjustment factor of soil impermeability, α is soil porosity, β is soil particle distribution uniformity, γ is soil permeability, δ is soil water content, ∈ is the second adjustment factor of soil impermeability, θ is soil particle size, and ι is the area of ​​soil pore structure.

[0019] Furthermore, the impermeability B of the pile material includes:

[0020] Among them, φ is the first adjustment factor of pile impermeability, λ is the pore structure of pile material, μ is the permeability of pile material, ν is the second adjustment factor of pile impermeability, κ is the compressive strength of pile material, and ρ is the corrosion degree of pile surface.

[0021] Furthermore, the method further includes: when the index of pile body leakage is greater than a preset threshold, pile body leakage occurs in the current cycle.

[0022] The present invention also provides a high-pressure jet grouting pile body leakage detection system, comprising:

[0023] The soil impermeability calculation module is used to calculate the soil impermeability by periodically obtaining soil porosity, soil particle distribution uniformity, soil permeability, soil moisture content, soil particle size, and the area of ​​soil pore structure as the high-pressure jet grouting pile body penetrates the soil.

[0024] The module for calculating the impermeability of pile materials is used to obtain the pore structure, permeability, compressive strength and corrosion degree of pile materials, and calculate the impermeability of pile materials.

[0025] The detection module is used to obtain the diameter of the pile body, the length of the pile body, the water flow rate during the construction of the high-pressure rotary jet pile, the construction speed of the high-pressure rotary jet pile, the pressure change value around the pile body as the pile body penetrates into the soil, the construction time, the pH value of the soil, the temperature of the soil and the inclination angle of the pile body, and set up a pile leakage point detection model based on the impermeability of the soil and the impermeability of the pile material, calculate the index of pile leakage points in each cycle, and thus detect pile leakage points.

[0026] Furthermore, the pile leakage detection model includes:

[0027] Among them, P is the index of pile leakage, A is the soil impermeability, B is the pile material impermeability, C is the pile diameter, D is the pile length, E is the water flow rate during high-pressure rotary jet grouting construction, K is the construction speed of high-pressure rotary jet grouting, M is the pressure change around the pile as the pile penetrates deeper into the soil, F is the construction time, I is the soil pH value, L is the soil temperature, and J is the inclination angle of the pile.

[0028] Furthermore, the soil impermeability A includes:

[0029] Among them, a is the first adjustment factor of soil impermeability, α is soil porosity, β is soil particle distribution uniformity, γ is soil permeability, δ is soil water content, ∈ is the second adjustment factor of soil impermeability, θ is soil particle size, and ι is the area of ​​soil pore structure.

[0030] Furthermore, the impermeability B of the pile material includes:

[0031] Among them, φ is the first adjustment factor of pile impermeability, λ is the pore structure of pile material, μ is the permeability of pile material, ν is the second adjustment factor of pile impermeability, κ is the compressive strength of pile material, and ρ is the corrosion degree of pile surface.

[0032] Furthermore, the method further includes: when the index of pile body leakage is greater than a preset threshold, pile body leakage occurs in the current cycle.

[0033] Compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:

[0034] The present invention addresses the problem of biased permeability coefficient measurement results due to local leakage during on-site high-pressure jet grouting pile borehole pressure water penetration tests. The present invention proposes an in-situ system and method for accurately detecting and repairing leakage points within each soil layer test section, as well as for segmented permeability coefficient testing. In-hole videography and assessment techniques are used to determine leakage points and treatment plans, and pressure grouting and spraying uniformity techniques are used for plugging leaks. An improved segmented permeability coefficient calculation method is used to determine the permeability coefficient. This is of great significance for the rational evaluation of the anti-seepage performance of high-pressure jet grouting pile composite foundations. The present invention has clear technical principles, is easy to operate, has strong applicability, and has certain promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG1 is a flow chart of Embodiment 2 of the present invention;

[0036] FIG2 is a system structure diagram of Example 3 of the present invention;

[0037] FIG3 is a schematic structural diagram of a leak detection system in a test hole according to Example 1 of the present invention;

[0038] FIG4 is a schematic structural diagram of a leakage point repair system in a test hole according to Example 1 of the present invention;

[0039] FIG5 is a diagram showing the calculation principle of the segmented permeability coefficient testing method in the test hole of Example 1 of the present invention.

[0040] The accompanying drawings are marked as follows: 1 is a borehole endoscope display; 2 is a winding wheel; 3 is a high-pressure rotary jet pile body; 4 is a communication optical cable; 5 is a guide wheel; 6 is a connecting rod; 7 is a lighting lamp; 8 is a wide-angle camera; 9 is a pressure grouting pump; 10 is a leakage point repair grouting material; 11 is a pressure gauge; 12 is a hose reel; 13 is a pressure grouting pipe; 14 is a micro electric motor; 15 is a spraying column; 16 is a brush. DETAILED DESCRIPTION

[0041] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0042] The method provided by the present invention can be implemented in the following terminal environment, wherein the terminal may include one or more of the following components: a processor, a storage medium, and a display screen. The storage medium stores at least one instruction, which is loaded and executed by the processor to implement the method described in the following embodiments.

[0043] A processor can include one or more processing cores. It connects various components within the terminal using various interfaces and circuits. It executes instructions, programs, code sets, or instruction sets stored in storage media, and accesses data stored in storage media to perform various terminal functions and process data.

[0044] The storage medium may include a random access memory (RAM) or a read-only memory (ROM). The storage medium may be used to store instructions, programs, codes, code sets, or instructions.

[0045] The display is used to show the user interface of each application.

[0046] All subscripts in the formulas of the present invention are only used to distinguish parameters and have no actual meaning.

[0047] In addition, those skilled in the art will appreciate that the structure of the terminal described above does not limit the terminal. The terminal may include more or fewer components, or a combination of certain components, or a different arrangement of components. For example, the terminal may also include a radio frequency circuit, an input unit, a sensor, an audio circuit, a power supply, and other components, which will not be described in detail here.

[0048] Example 1

[0049] The present invention provides a leakage point detection device for a high-pressure rotary jet pile, which mainly consists of two parts: a leakage point detection system and a leakage point repair system.

[0050] As shown in FIG3 , the leakage detection system is composed of a borehole endoscope display 1 , a winding wheel 2 , a communication optical cable 4 , a guide wheel 5 , a connecting rod 6 , an LED lighting lamp 7 , and a high-definition wide-angle camera 8 . The borehole endoscope display 1 can record the water seepage of the inner wall of the borehole in real time, and can take pictures and record the leakage points; the winding wheel 2 is used to retract and extend the communication optical cable 4 up and down; the communication optical cable 4 consists of a video cable and a power cable, and is made of flame-retardant shielded environmentally friendly cable; the guide wheel 5 is connected to the connecting rod 6 by a spring, which can ensure that when the high-definition wide-angle camera 8 slides up and down, the guide wheel is tightly connected to the hole wall of the high-pressure rotary jet pile 3; the lower part of the connecting rod 6 is fixed with an LED lighting lamp 7 and a high-definition wide-angle camera 8, and the upper part is connected to the communication optical cable 4; the LED lighting lamp 7 is used to provide light to the pile body drilling hole of the high-pressure rotary jet pile 3, so that the high-definition wide-angle camera 8 can record more clearly; the high-definition wide-angle camera 8 adopts a micro high-definition 1080P macro 12.5x, with a size of 15mm×15mm×18mm (length, width and thickness), which can clearly record the water seepage points of the hole wall.

[0051] As shown in FIG4 , the leakage point repair system is composed of a pressure grouting pump 9 , a leakage point repair grouting material 10 , a pressure gauge 11 , a hose reel 12 , a pressure grouting pipe 13 , a micro electric motor 14 , a spraying column 15 , and a brush 16 . The theoretical grouting pressure of the pressure grouting pump 9 is 4MPa, and the theoretical grouting volume is 60L / min, which can ensure that under this pressure, the leakage point repair grouting material 10 is evenly sprayed on the inner wall of the high-pressure rotary jet pile 3 borehole; the leakage point repair grouting material 10 is made of quick-drying cement, hydrophobic emulsion, and water in a ratio of 10:0.1:3, and is evenly sprayed on the inner wall of the high-pressure rotary jet pile 3 borehole from the spray column 15. After being evenly applied by the brush 16, rapid plugging is achieved; the hose reel 12 is placed just above the high-pressure rotary jet pile 3 pile body borehole, and the pressure grouting pipe 13 is wound around it to achieve the up and down movement of the pressure grouting pipe 13; the pressure grouting pipe 13 uses a hard rubber tube, which is injected with clean water before use, and the grouting material is replaced after checking for leakage; the micro electric motor 14 can drive the spray column 15 and the brush 16 to rotate, The leakage point repair grouting material 10 is evenly applied to the hole wall of the high-pressure rotary jet pile 3; the grouting holes are distributed on the grouting column 15, and the height of the grouting column is 10 cm. Each depth can achieve grouting of the leakage point within a range of at least 10 cm; the brush 16 can be driven by the micro electric motor 14 to brush the grouting material sprayed on the inner wall of the drill hole evenly.

[0052] As shown in FIG5 , the present invention also provides an operating method for a high-pressure jet grouting pile body leakage point detection device and a segmented permeability coefficient testing method, and the specific steps are as follows:

[0053] Step 1: Before detection, first use a drilling rig to drill a hole in the pile body of the high-pressure rotary jet pile 3. After the drilling rig cleans the hole, use a centrifugal pump to remove the water in the hole, and then start detecting the leakage point. Fix the winding wheel 2 at the edge of the hole, and put the high-definition wide-angle camera 8, LED lighting 7, connecting rod 6, guide wheel 5 and the communication cable on it into the hole in turn, and lower it to the bottom of the hole. There are length marks every 5 cm on the communication cable 4. Turn on the LED lighting and the borehole endoscope display 1, and slowly and uniformly pull the communication cable 4 upward from the bottom of the hole. When a water seepage point is found on the inner wall of the borehole, record the depth position on the communication cable 4, and take a picture through the borehole endoscope display 1 until it is lifted to the top of the hole. Determine the depth of each leakage point, analyze and evaluate the degree of leakage on the hole wall, and determine the duration of the grouting.

[0054] Step 2: Repair the leakage point. First, place the hose reel 12 just above the drilled hole of the high-pressure rotary jet pile 3. Then, slowly lower the pressure grouting pipe 13, micro-electric motor 14, grouting column 15, and brush 16 to the bottom of the drilled hole of the high-pressure rotary jet pile 3. Then, slowly lift it to the detected leakage point, turn on the pressure grouting pump 9 switch, and spray the leakage point repair grouting material 10 on the inner wall of the drilled hole of the high-pressure rotary jet pile 3; turn on the micro-electric motor 14 switch, the brush 16 rotates and evenly spreads the leakage point repair grouting material 10 sprayed on the inner wall of the drilled hole to seal the leakage point; then lift the pressure grouting pipe 13 to repair the detected leakage points in turn.

[0055] Step 3: Use the permeability coefficient measurement method recommended in the invention patent: A variable head segmented permeability coefficient measurement device and measurement method (grant number: CN 103091229B) in the background technology. However, since some leakage points have been blocked, the actual permeability section length has been reduced, so the calculation formula for the permeability coefficient has changed. The specific calculation method is as follows:

[0056] Where: t is the interval time; K r is the permeability coefficient; r c is the radius of the measuring cylinder, b is the length of the measuring section, is the length of the leak point after it is plugged within the measurement range; H0 is the water level in the measuring cylinder when water is just added, that is, the height from the initial liquid level in the measuring cylinder to the liquid level in the borehole after water is added; H t H is the height from the liquid level in the measuring cylinder to the liquid level in the borehole after the water level in the measuring cylinder drops and the interval t is reached. t =h0+h t , where h0 is the absolute head, that is, the distance from the liquid surface in the borehole to the bottom of the measuring cylinder, h t is the relative head, that is, the distance from the liquid surface to the bottom of the measuring cylinder, A is the groundwater level in the borehole, and B is the measuring depth.

[0057] Example 2

[0058] As shown in FIG1 , the present invention proposes a method for detecting leakage points in a high-pressure jet grouting pile, comprising:

[0059] Step 101, when the high-pressure jet grouting pile begins construction, as the pile body penetrates into the soil, soil porosity, soil particle distribution uniformity, soil permeability, soil water content, soil particle size and the area of ​​the soil pore structure are obtained according to the cycle, and the soil impermeability is calculated;

[0060] Specifically, the soil impermeability A includes:

[0061] Among them, a is the first adjustment factor of soil impermeability, α is soil porosity, β is soil particle distribution uniformity, γ is soil permeability, δ is soil water content, ∈ is the second adjustment factor of soil impermeability, θ is soil particle size, and ι is the area of ​​soil pore structure.

[0062] Step 102, at the same time, obtaining the pore structure of the pile material, the permeability of the pile material, the compressive strength of the pile material and the corrosion degree of the pile surface, and calculating the impermeability of the pile material;

[0063] Specifically, the impermeability B of the pile material includes:

[0064] Among them, φ is the first adjustment factor of pile impermeability, λ is the pore structure of pile material, μ is the permeability of pile material, ν is the second adjustment factor of pile impermeability, κ is the compressive strength of pile material, and ρ is the corrosion degree of pile surface.

[0065] Step 103 is to obtain the diameter of the pile body, the length of the pile body, the water flow during the high-pressure rotary jet grouting pile construction, the construction speed of the high-pressure rotary jet grouting pile, the pressure change value around the pile body as the pile body penetrates into the soil, the construction time, the pH value of the soil, the temperature of the soil and the inclination angle of the pile body, and set a pile leakage point detection model based on the impermeability of the soil and the impermeability of the pile material, calculate the index of pile leakage points in each cycle, and thus detect pile leakage points.

[0066] Specifically, the pile leakage detection model includes:

[0067] Among them, P is the index of pile leakage, A is the soil impermeability, B is the pile material impermeability, C is the pile diameter, D is the pile length, E is the water flow rate during high-pressure rotary jet grouting construction, K is the construction speed of high-pressure rotary jet grouting, M is the pressure change around the pile as the pile penetrates deeper into the soil, F is the construction time, I is the soil pH value, L is the soil temperature, and J is the inclination angle of the pile.

[0068] Specifically, it also includes: when the index of pile leakage is greater than a preset threshold, pile leakage occurs in the current cycle.

[0069] Example 3

[0070] As shown in FIG2 , the present invention further proposes a high-pressure jet grouting pile body leakage detection system, comprising:

[0071] The soil impermeability calculation module is used to calculate the soil impermeability by periodically obtaining soil porosity, soil particle distribution uniformity, soil permeability, soil moisture content, soil particle size, and the area of ​​soil pore structure as the high-pressure jet grouting pile body penetrates into the soil.

[0072] Specifically, the soil impermeability A includes:

[0073] Among them, a is the first adjustment factor of soil impermeability, α is soil porosity, β is soil particle distribution uniformity, γ is soil permeability, δ is soil water content, ∈ is the second adjustment factor of soil impermeability, θ is soil particle size, and ι is the area of ​​soil pore structure.

[0074] The module for calculating the impermeability of pile materials is used to obtain the pore structure, permeability, compressive strength and corrosion degree of pile materials, and calculate the impermeability of pile materials.

[0075] Specifically, the impermeability B of the pile material includes:

[0076] Among them, φ is the first adjustment factor of pile impermeability, λ is the pore structure of pile material, μ is the permeability of pile material, ν is the second adjustment factor of pile impermeability, κ is the compressive strength of pile material, and ρ is the corrosion degree of pile surface.

[0077] The detection module is used to obtain the diameter of the pile body, the length of the pile body, the water flow rate during the construction of the high-pressure rotary jet pile, the construction speed of the high-pressure rotary jet pile, the pressure change value around the pile body as the pile body penetrates into the soil, the construction time, the pH value of the soil, the temperature of the soil and the inclination angle of the pile body, and set up a pile leakage point detection model based on the impermeability of the soil and the impermeability of the pile material, calculate the index of pile leakage points in each cycle, and thus detect pile leakage points.

[0078] Specifically, the pile leakage detection model includes:

[0079] Among them, P is the index of pile leakage, A is the soil impermeability, B is the pile material impermeability, C is the pile diameter, D is the pile length, E is the water flow rate during high-pressure rotary jet grouting construction, K is the construction speed of high-pressure rotary jet grouting, M is the pressure change around the pile as the pile penetrates deeper into the soil, F is the construction time, I is the soil pH value, L is the soil temperature, and J is the inclination angle of the pile.

[0080] Specifically, it also includes: when the index of pile leakage is greater than a preset threshold, pile leakage occurs in the current cycle.

[0081] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0082] In the above embodiments of the present invention, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0083] In the several embodiments provided by the present invention, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the system embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, and can be electrical or other forms.

[0084] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0085] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0086] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only storage medium (ROM, Read-Only Memory), random access storage medium (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, and other media that can store program code.

[0087] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A device for detecting leakage points in the pile body of a high-pressure jet grouting pile, characterized in that, it includes: a leakage point detection system and a leakage point repair system; The leakage point detection system includes: a borehole endoscope display (1) for real-time recording of the water seepage condition on the inner wall of the borehole; a wire winding wheel (2) for winding and unwinding the communication optical cable (4) up and down; a guide wheel (5) for ensuring that when the high-definition wide-angle camera (8) slides up and down, the guide wheel is tightly connected to the hole wall of the borehole of the high-pressure jet grouting pile (3) and is connected to the connecting rod (6) through a spring; an LED lighting lamp (7) and a high-definition wide-angle camera (8) are fixed at the lower part of the connecting rod (6), and the upper part is connected to the communication optical cable (4); the LED lighting lamp (7) is used to provide illumination inside the borehole of the pile body of the high-pressure jet grouting pile (3) to facilitate recording by the high-definition wide-angle camera (8); The leakage point repair system includes: a pressure grouting pump (9), a leakage point repair grouting material (10), a pressure gauge (11), a pipe coiling reel (12), a pressure grouting pipe (13), a micro electric motor (14), a grouting column (15), and a brush (16).

2. An operation method of a device for detecting leakage points in the pile body of a high-pressure jet grouting pile, characterized in that, it includes: Step 1: Before detection, first use a drilling rig to drill a hole in the pile body of the high-pressure jet grouting pile (3). After the drilling rig clears the hole, use a centrifugal pump to pump out the water in the hole. Then start the leakage point detection. Fix the wire winding wheel (2) beside the hole, and sequentially put the high-definition wide-angle camera (8), the LED lighting lamp (7), the connecting rod (6), the guide wheel (5) and the communication optical cable above it into the hole and lower them to the bottom of the hole. Mark the communication optical cable (4) at a certain length interval. Turn on the LED lighting lamp (7) and the borehole endoscope display (1), and slowly and evenly pull up the communication optical cable (4) from the bottom of the hole. When a water seepage point is found on the inner wall of the borehole, record the depth position on the communication optical cable (4) and take a photo through the borehole endoscope display (1) until it is lifted to the top of the hole, determine the depth of each leakage point, analyze and evaluate the degree of hole wall leakage, and determine the grouting duration; Step 2: Carry out leakage point repair. First, place the pipe coiling reel (12) directly above the borehole of the pile body of the high-pressure jet grouting pile (3). Then slowly lower the pressure grouting pipe (13), the micro electric motor (14), the grouting column (15), and the brush (16) to the bottom of the borehole of the pile body of the high-pressure jet grouting pile (3), and then slowly lift them to the detected leakage points. Turn on the switch of the pressure grouting pump (9), and spray the leakage point repair grouting material (10) on the inner wall of the borehole of the pile body of the high-pressure jet grouting pile (3); turn on the switch of the micro electric motor (14), and the brush (16) rotates and evenly smears the leakage point repair grouting material (10) sprayed on the inner wall of the borehole to achieve leakage point plugging; then lift the pressure grouting pipe (13) and repair the detected leakage points in sequence.

3. A method for detecting leakage points in the pile body of a high-pressure jet grouting pile in cooperation with the device as claimed in claim 1, characterized in that, it includes: When the high-pressure jet grouting pile starts construction, as the pile penetrates into the soil, according to the cycle, obtain the soil porosity, the uniformity of soil particle distribution, soil permeability, soil water content, soil particle size, and the area of the soil pore structure, and calculate the impermeability of the soil; Meanwhile, obtain the pore structure of the pile material, the permeability of the pile material, the compressive strength of the pile material, and the corrosion degree of the pile surface, and calculate the impermeability of the pile material; Obtain the diameter of the pile, the length of the pile, the water flow rate during the construction of the high-pressure jet grouting pile, the construction speed of the high-pressure jet grouting pile, the pressure change value around the pile as the pile penetrates into the soil, the construction time, the pH value of the soil, the temperature of the soil, and the inclination angle of the pile, and set up a pile leak detection model based on the impermeability of the soil and the impermeability of the pile material, and calculate the index of pile leaks in each cycle, so as to detect the pile leaks.

4. A method for detecting pile leaks of a high-pressure jet grouting pile as described in claim 3, characterized in that, The pile body leakage point detection model includes: wherein, P is the index of pile leaks, A is the impermeability of the soil, B is the impermeability of the pile material, C is the diameter of the pile, D is the length of the pile, E is the water flow rate during the construction of the high-pressure jet grouting pile, K is the construction speed of the high-pressure jet grouting pile, M is the pressure change value around the pile as the pile penetrates into the soil, F is the construction time, I is the pH value of the soil, L is the temperature of the soil, and J is the inclination angle of the pile.

5. A method for detecting pile leaks of a high-pressure jet grouting pile as described in claim 4, characterized in that, The impermeability A of the soil includes: wherein, a is the first adjustment factor of soil impermeability, α is the soil porosity, β is the uniformity of soil particle distribution, γ is the soil permeability, δ is the soil water content, ∈ is the second adjustment factor of soil impermeability, θ is the soil particle size, and ι is the area of the soil pore structure.

6. A method for detecting pile leaks of a high-pressure jet grouting pile as described in claim 4, characterized in that, The impermeability B of the pile body material includes: wherein, φ is the first adjustment factor of pile impermeability, λ is the pore structure of the pile material, μ is the permeability of the pile material, v is the second adjustment factor of pile impermeability, κ is the compressive strength of the pile material, and ρ is the corrosion degree of the pile surface.

7. A method for detecting pile leaks of a high-pressure jet grouting pile as described in claim 3, characterized in that, further comprising: When the index of pile leaks is greater than the preset threshold, then pile leaks occur in the current cycle.

8. A high-pressure jet grouting pile leak detection system, characterized in that, comprising: A module for calculating the impermeability of the soil, which is used to obtain the soil porosity, the uniformity of soil particle distribution, soil permeability, soil water content, soil particle size, and the area of the soil pore structure according to the cycle as the pile penetrates into the soil when the high-pressure jet grouting pile starts construction, and calculate the impermeability of the soil; A module for calculating the impermeability of the pile material, which is used to obtain the pore structure of the pile material, the permeability of the pile material, the compressive strength of the pile material, and the corrosion degree of the pile surface, and calculate the impermeability of the pile material; A detection module, which is used to obtain the diameter of the pile body, the length of the pile body, the water flow rate during the construction of the high-pressure jet grouting pile, the construction speed of the high-pressure jet grouting pile, the pressure change value around the pile body as the pile body penetrates into the soil, the construction time, the pH value of the soil, the temperature of the soil, and the inclination angle of the pile body, and set up a pile body leakage point detection model according to the impermeability of the soil and the impermeability of the pile body material, calculate the index of the pile body leakage point in each cycle, so as to detect the pile body leakage point.

9. A high-pressure jet grouting pile body leakage point detection system according to claim 8, characterized in that, The pile body leakage point detection model includes: wherein, P is the index of the pile body leakage point, A is the impermeability of the soil, B is the impermeability of the pile body material, C is the diameter of the pile body, D is the length of the pile body, E is the water flow rate during the construction of the high-pressure jet grouting pile, K is the construction speed of the high-pressure jet grouting pile, M is the pressure change value around the pile body as the pile body penetrates into the soil, F is the construction time, I is the pH value of the soil, L is the temperature of the soil, and J is the inclination angle of the pile body.

10. A high-pressure jet grouting pile body leakage point detection system according to claim 9, characterized in that, The impermeability A of the soil includes: wherein, a is the first adjustment factor of soil impermeability, α is the soil porosity, β is the soil particle distribution uniformity, γ is the soil permeability, δ is the soil water content, ∈ is the second adjustment factor of soil impermeability, θ is the soil particle size, and ι is the area of the soil pore structure.

11. A high-pressure jet grouting pile body leakage point detection system according to claim 9, characterized in that, The impermeability B of the pile body material includes: wherein, φ is the first adjustment factor of pile body impermeability, λ is the pore structure of the pile body material, μ is the permeability of the pile body material, v is the second adjustment factor of pile body impermeability, κ is the compressive strength of the pile body material, and ρ is the corrosion degree of the pile body surface.

12. A high-pressure jet grouting pile body leakage point detection system according to claim 8, characterized in that, further comprising: when the index of the pile body leakage point is greater than the preset threshold, there is a pile body leakage point in the current cycle.

Images