Internal energy type intelligent pressure-reducing integrated miniature steel pipe pile mud jacking device and internal energy type intelligent pressure-reducing integrated miniature steel pipe pile mud jacking method

Abstract

The invention discloses an internal energy type intelligent pressure-reducing integrated miniature steel pipe pile grouting device and method. The internal energy type intelligent pressure-reducing integrated miniature steel pipe pile grouting device comprises an internal energy type intelligent pressure-reducing integrated grouting device body, an external grouting pipe, a miniature steel pipe pile, a comprehensive control cable and an intelligent grouting control cabinet. The problems that a traditional miniature steel pipe pile cannot improve the bearing capacity of a single pile through a pile foundation grouting technology and cannot be applied to a hard rock-soil layer can be solved. Based on the internal energy driving principle, fluid kinetic energy contained in the high-pressure cement grout is used for driving the cutting cutterhead to work, the functions of cutting rock-soil bodies and grouting reinforcement are achieved at the same time, an external driving device does not need to be additionally arranged, and device simplification and cost reduction are achieved. According to the invention, the condition of the rock-soil body can be intelligently sensed, and intelligent construction operation is carried out according to the optimal grouting parameters and cutting parameters according to the condition of the rock-soil body. Meanwhile, the device has the recycling and reusing functions.

Description

Technical Field

[0001] This application belongs to the technical field of water conservancy engineering and water transportation engineering construction, and specifically relates to an internal energy type intelligent pressure reduction integrated micro steel pipe pile grouting device and method. Background Technique

[0002] The micro steel pipe pile is a new type of pile that combines the steel pipe pile and micro pile technologies, with the characteristics of strong adaptability, high safety factor, and convenient construction. Due to its unique advantages, the micro steel pipe pile has been widely valued by engineering personnel in recent years and has been gradually promoted in water conservancy engineering and water transportation engineering. However, the existing micro steel pipe pile sinking processes (hammering method and static pressure method) limit the application of micro steel pipe piles. When the existing micro steel pipe piles are sunk in hard rock and soil layers, it is not easy to penetrate the rock and soil layers and it is easy to cause damage to the pile tip. It is only applicable to soft soil layers with relatively small sinking resistance and cannot be applied to hard soil or rock layers. At the same time, the diameter of the micro steel pipe pile is generally small, usually 100 - 300 mm, so its single pile bearing capacity is limited, which to a certain extent affects and restricts the application range of micro steel pipe piles. The pile foundation grouting process effectively enhances the strength of the rock and soil layers around the pile by injecting cement slurry into the rock and soil layers around the pile, thereby improving the bearing capacity of the pile foundation. At present, the pile foundation grouting process has been widely applied in bored cast-in-place piles, but due to the limitations of the micro steel pipe pile construction process and the existing pile foundation grouting devices, the application of the pile foundation grouting process in micro steel pipe piles is still rare.

[0003] Traditional grouting devices usually extend the grouting valve out of the pile bottom or pile side, and the slurry outlet holes are arranged on the side wall of the grouting valve. While the micro steel pipe pile usually uses the hammering method or static pressure method for pile sinking operations, so the traditional grouting device will be severely damaged during the pile sinking process of the micro steel pipe pile. In addition, in the face of hard soil layers or rock layers, the existing micro steel pipe piles often cannot effectively enter such soil layers. The above defects limit the application of the pile foundation grouting process in micro steel pipe piles. How to solve the above problems is the key to effectively improving the bearing capacity of the micro steel pipe pile foundation, and there is currently no effective measure to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide an internal energy type intelligent pressure reduction integrated micro steel pipe pile grouting device and method, which are used to solve the problems that traditional micro steel pipe piles cannot improve the single pile bearing capacity through the pile foundation grouting technology and their application in hard rock and soil layers.

[0005] To achieve the above purpose, the technical solution of the present invention is:

[0006] An internal energy type intelligent cutting and pressure grouting integrated micro steel pipe pile grouting device, comprising an internal energy type intelligent cutting and pressure grouting integrated grouting device, an external grouting pipe, a micro steel pipe pile, a comprehensive control cable and an intelligent grouting control cabinet; the internal energy type intelligent cutting and pressure grouting integrated grouting device includes an intelligent rock sensing and breaking device, an intelligent cutting and pressure grouting integrated device, a reusable multi-functional rolling bearing, and a pin type sealed grouting joint;

[0007] Further, the intelligent rock sensing and breaking device is connected to the intelligent cutting and pressure grouting integrated device through a first hollow bolt. The tail of the intelligent cutting and pressure grouting integrated device is inserted into the end of the micro steel pipe pile and is connected to the reusable multi-functional rolling bearing through a second hollow bolt. The reusable multi-functional rolling bearing is fixed to the inner wall of the micro steel pipe pile through a second electromagnetic buckle. The reusable multi-functional rolling bearing is connected to the external grouting pipe through a pin type sealed grouting joint. The intelligent grouting control cabinet controls the intelligent cutting and pressure grouting integrated device and the reusable multi-functional rolling bearing through control instructions.

[0008] Preferably, the intelligent rock sensing and breaking device includes an RI-CPTU probe, a soil guiding partition board, a rock and soil layer parameter analysis and decision-making module, a first built-in cable and a first hollow bolt; the intelligent rock sensing and breaking device has a geological parameter inversion function and can real-time determine the distribution and property changes of the rock layer or soil layer faced by the micro steel pipe pile during the pile sinking, cutting and grouting processes.

[0009] Preferably, the intelligent cutting and pressure grouting integrated device includes a cutting cutter head, an integrated grouting device base pipe, a grout outlet hole, a grouting parameter sensing module, a first sealing rubber ring, a rotor blade, a magnetic coupling type regulator, a rotation speed sensor and a second hollow bolt; the cutting blades are fixed on the cutting blade base through a first electromagnetic buckle to form a cutting cutter head; the blade angle and attitude of the rotor blade can be adjusted through the magnetic coupling type regulator.

[0010] An intelligent grouting method, based on the above-mentioned internal energy type intelligent cutting and pressure grouting integrated micro steel pipe pile grouting device, specifically includes the following steps:

[0011] The intelligent rock sensing and breaking device real-time feeds back the types, distributions and geological parameters of the rock and soil layers to the intelligent grouting control cabinet; the intelligent grouting control cabinet intelligently adjusts the grouting parameters according to the fed-back rock and soil layer data.

[0012] Preferably, when the above-mentioned internal energy type intelligent cutting and pressure grouting integrated micro steel pipe pile grouting device is located in the soil layer, the slurry pressure P is adjusted in real-time according to the following calculation formula:

[0013]

[0014] Wherein, P is the slurry pressure; K1, K2, and K3 are correction factors; c is the cohesion of the soil layer; H is the burial depth of the soil layer where the grouting position is located; γ is the average effective unit weight of each rock and soil layer above the grouting position; is the internal friction angle of the soil layer where the grouting position is located.

[0015] Preferably, when the internal energy type intelligent cutting and pressure grouting integrated micro steel pipe pile grouting device is located in the rock layer, the slurry pressure P is adjusted in real time according to the following calculation formula:

[0016] P = K4γH + K5(RQD)

[0017] Wherein, P is the slurry pressure; K4 and K5 are correction factors; RQD is the rock mass quality index; H is the burial depth of the rock layer where the grouting position is located; γ is the average effective unit weight of each rock and soil layer above the grouting position.

[0018] Preferably, the slurry flow velocity V and the slurry flow rate Q of the high-pressure cement slurry in the intelligent cutting and pressure grouting integrated grouting device can be converted according to the slurry pressure P, and the calculation formulas for the slurry flow velocity V and the slurry flow rate Q are as follows:

[0019]

[0020] Wherein, V is the slurry flow velocity; Q is the slurry flow rate; P is the slurry pressure; P s is the hydrostatic pressure of the rock and soil layer where the grouting position is located; D is the inner diameter of the grouting pipe at the position where the slurry is located.

[0021] An intelligent rock and soil cutting method, based on the internal energy type intelligent cutting and pressure grouting integrated micro steel pipe pile grouting device described in claim 3, specifically includes the following steps:

[0022] The intelligent perception rock breaker feeds back the types, distributions, and geological parameters of the rock and soil layers to the intelligent grouting control cabinet in real time; the revolution sensor feeds back the cutting revolution speed of the cutting cutter head to the intelligent grouting control cabinet in real time; the intelligent grouting control cabinet issues a regulation instruction to the magnetic coupling type regulator to change the blade angle, attitude, and revolution speed of the rotor blades; the rotor blades with changed revolution speed drive the cutting cutter head to change the cutting revolution speed through the integrated grouting device base pipe.

[0023] Preferably, the calculation formula for the revolution speed n of the cutting cutter head and the rotor blades is as follows:

[0024]

[0025] Wherein, n is the revolution speed of the cutting cutter head and the rotor blades, D is the inner diameter of the grouting pipe at the position where the rotor blades are located; N y is the number of blades on the rotor blades; S yis the vertical projection area of ​​a single blade on the rotor blade; β is the angle between the normal direction of the blade centroid of the rotor blade and the slurry flow direction; V is the slurry flow rate; f is the fluid characteristic calculation coefficient.

[0026] A construction method of an internal energy type intelligent cutting and pressing integrated micro steel pipe pile grouting device comprises the following steps:

[0027] a. Determine the scheduled construction site, install the internal energy type intelligent cutting and pressure integrated grouting device into the micro steel pipe pile, control the verticality of the pile body and prepare for pile sinking construction;

[0028] b. Carry out a clean water pressure test, using clean water as the grouting medium to check whether the internal energy type intelligent cutting and pressure integrated grouting device is working properly, and control the number of rotations of the cutting disc through the intelligent grouting control cabinet to press the micro steel pipe pile equipped with the internal energy type intelligent cutting and pressure integrated grouting device into the soil;

[0029] c. Carry out formal construction work, change the grouting medium from clean water to cement slurry, and the intelligent grouting control cabinet controls the rotation speed of the cutting disc and the pile sinking speed of the micro steel pipe pile, and performs cutting and grouting operations simultaneously during the pile sinking process;

[0030] d. After the construction is completed, an unlocking command is sent to the first electromagnetic buckle and the second electromagnetic buckle through the intelligent grouting control cabinet to release the clamping state of the first electromagnetic buckle and the second electromagnetic buckle, and the internal energy recovery type intelligent cutting and pressing integrated grouting device is lifted up.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. After the rock breaker enters the rock and soil layer through intelligent sensing, the present invention drives the cutting disc to cut the rock and soil layer through cement slurry, which can effectively prevent the pile body and grouting device of the micro steel pipe pile from being damaged by the hard rock and soil layer during the pile sinking process, thereby promoting the application of micro steel pipe piles in hard rock and soil layers and expanding the application scope of micro steel pipe piles; when cutting the rock and soil body, the present invention can simultaneously press cement slurry into the cut rock and soil body, thereby realizing the functions of cutting the rock and soil body and grouting reinforcement (cutting and pressing integrated function);

[0033] 2. Based on the internal energy driving principle, the driving force of the cutting disc comes from the fluid kinetic energy contained in the high-pressure cement slurry. The present invention does not require additional external power to drive the cutting disc to work. At the same time, the device has a recyclable reuse function, which realizes the simplification of the device and the reduction of costs (internal energy driving and recycling reuse functions);

[0034] 3. The device can sense the geotechnical conditions during the construction process in real time, and adjust according to the geotechnical conditions in a timely manner according to the optimal grouting parameters and cutting parameters, so that the cement slurry can be better mixed with the soil around the pile, ensuring that the micro steel pipe pile can complete the pile sinking and grouting operations smoothly (intelligent sensing, intelligent pressure regulation, and intelligent speed change). Description of the Drawings

[0035] Figure 1 is a schematic diagram of an internal energy type intelligent cutting and pressing integrated micro steel pipe pile grouting device provided by the present invention;

[0036] Figure 2 is a side sectional view of the internal energy type intelligent cutting and pressing integrated grouting device of the present invention;

[0037] Figure 3 is a structural schematic diagram of the internal energy type intelligent cutting and pressing integrated grouting device of the present invention;

[0038] Figure 4 is a structural schematic diagram of the intelligent sensing rock breaker of the present invention;

[0039] Figure 5 is a structural schematic diagram of the intelligent cutting and pressing integrated grouting device of the present invention;

[0040] Figure 6 is a structural schematic diagram of the reusable multi-functional rolling bearing of the present invention;

[0041] Figure 7 is a structural schematic diagram of the plug-in sealed grouting joint of the present invention;

[0042] Figure 8 is the measured residual value of the slurry pressure in the cohesionless layer obtained by applying the prediction formula of the present invention;

[0043] Figure 9 is the measured residual value of the slurry pressure in the cohesive soil layer obtained by applying the prediction formula of the present invention;

[0044] Figure 10 is the measured residual value of the slurry pressure in the rock layer obtained by applying the prediction formula of the present invention;

[0045] Figure 11 is a comparison chart of the measured value and the predicted value of the relationship between the rotational speed of the cutting cutter head and the slurry flow velocity V of the present invention;

[0046] Figure 12 is a comparison chart of the measured value and the predicted value of the relationship between the rotational speed of the cutting cutter head and the blade angle β of the present invention;

[0047] Figure 13 is a schematic diagram of the construction process and use effect of the micro steel pipe pile of the present invention;

[0048] In the figure: 1 - Internal energy type intelligent cutting and pressure grouting integrated device, 2 - External pressure grouting pipe, 3 - Micro steel pipe pile, 4 - Comprehensive control cable, 5 - Intelligent pressure grouting control cabinet, 101 - Intelligent rock sensing breaker, 102 - Intelligent cutting and pressure grouting integrated device, 103 - Reusable multi-functional rolling bearing, 104 - Pin type sealed grouting joint, 1011 - RI-CPTU probe, 1012 - Soil guiding partition board, 1013 - Rock and soil layer parameter analysis and decision-making module, 1014 - First internal cable, 1015 - First hollow bolt, 1021 - Cutting cutter head, 1022 - Integrated pressure grouting device base pipe, 1023 - Grout outlet hole, 1024 - Pressure grouting parameter sensing module, 1025 - First sealing rubber ring, 1026 - Rotor blade, 1027 - Magnetic coupling type regulator, 1028 - Rotation speed inductor, 1029 - Second hollow bolt, 10211 - Cutting blade, 10212 - First electromagnetic buckle, 10213 - Cutting blade base, 1031 - Second electromagnetic buckle, 1032 - Roller bearing, 1033 - First internal pressure grouting pipe, 1041 - Second internal pressure grouting pipe, 1042 - Second sealing rubber ring, 1043 - Outer sleeve type O-shaped pin, 1044 - Control signal relay module. Detailed implementation mode

[0049] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0050] Embodiment 1

[0051] Refer to Figure 1 , a kind of internal energy type intelligent cutting and pressure grouting integrated micro steel pipe pile grouting device of the present invention includes: internal energy type intelligent cutting and pressure grouting integrated device 1, external pressure grouting pipe 2, micro steel pipe pile 3, comprehensive control cable 4 and intelligent pressure grouting control cabinet 5. The internal energy type intelligent cutting and pressure grouting integrated device 1 plays the role of intelligent cutting of rock and soil layers and intelligent pressure grouting, and can real-time feedback the rock and soil layer parameters and pressure grouting parameters to the intelligent pressure grouting control cabinet 5. The intelligent pressure grouting control cabinet 5 has the functions of intelligent analysis and control, controls the internal energy type intelligent cutting and pressure grouting integrated device 1 to carry out cutting and pressure grouting operations simultaneously, and the intelligent pressure grouting control cabinet 5 integrates the functions of cement slurry storage, stirring and transportation. The intelligent pressure grouting control cabinet 5 real-time adjusts and controls the pressure grouting parameters (slurry pressure P, slurry flow velocity V, slurry flow rate Q). The internal energy type intelligent cutting and pressure grouting integrated device 1 is connected to the intelligent pressure grouting control cabinet 5 through the external pressure grouting pipe 2 and the comprehensive control cable 4.

[0052] Refer to Figure 1 , Figure 2 and Figure 3, manufacture the internal energy type intelligent cutting and pressure grouting integrated device 1, and the specific steps are as follows: The intelligent rock-breaking sensor 101 is connected to the intelligent cutting and pressure grouting integrated device 1 through the first hollow bolt 1015. The intelligent cutting and pressure grouting integrated device 1 is then connected to the reusable multi-functional rolling bearing 103 through the second hollow bolt 1029. The pin-type sealed grouting joint 104 is directly installed on the reusable multi-functional rolling bearing 103 in a pin connection manner. The internal energy type intelligent cutting and pressure grouting integrated device 1 is connected to the external grouting pipe 2 by welding. The comprehensive control cable 4 is connected to the control signal relay module 1044 of the internal energy type intelligent cutting and pressure grouting integrated device 1.

[0053] Insert the connected internal energy type intelligent cutting and pressure grouting integrated device 1, external grouting pipe 2, and comprehensive control cable 4 into the end part of the micro steel pipe pile 3. Set the second electromagnetic buckle 1031 to the tightened state through the intelligent grouting control cabinet 5 so that it can be fixed on the inner wall of the micro steel pipe pile 3. According to the size of the energy type intelligent cutting and pressure grouting integrated device 1 and the fixing position of the second electromagnetic buckle 1031, recessed fixing points are pre-set at the corresponding positions on the inner wall of the micro steel pipe pile 3. The number of recessed fixing points set corresponds to the number of the second electromagnetic buckles 1031, and the set number N≥2, which are evenly distributed with the central axis of the micro steel pipe pile 3 as the symmetry axis. When the diameter range of the internal energy type intelligent cutting and pressure grouting integrated device 1 is 100-300 mm, its size is adaptively adjusted according to the actual size of the micro steel pipe pile 3.

[0054] Refer to Figure 2 and Figure 4 , the intelligent rock-breaking sensor 101 is arranged at the front outer edge of the micro steel pipe pile 3, so that the micro steel pipe pile 3 has the functions of piercing hard rock and soil layers and obtaining inverse geotechnical parameters during the pile driving and grouting processes. The intelligent rock-breaking sensor 101 includes an RI-CPTU probe 1011, a soil guiding partition 1012, a geotechnical parameter analysis and decision-making module 1013, a first built-in cable 1014, and a first hollow bolt 1015. The shell of the RI-CPTU probe 1011 is made of cemented carbide material, in a conical shape, and the cone angle is less than 30°. The RI-CPTU probe 1011 is powered by a built-in battery and has the function of inverse geotechnical parameters. It can determine the distribution and types of rock and soil layers faced by the micro steel pipe pile 3 during the pile driving, cutting, and grouting processes in real time, and obtain the average effective unit weight γ, cohesion c, internal friction angle rock quality designation RQD, rock and soil layer depth H, hydrostatic pressure P s and water content ω and other geotechnical parameters of the rock and soil layers.

[0055] The housing of the soil guiding partition plate 1012 is made of cemented carbide material, with a streamline shape. It is located behind the intelligent sensing rock breaking device 101 and serves to guide and divert the soil mass. The soil guiding partition plate 1012 is internally provided with a rock and soil layer parameter analysis and decision-making module 1013. The intelligent sensing rock breaking device 101 is connected to the soil guiding partition plate 1012 by threads. The RI-CPTU probe 1011 and the rock and soil layer parameter analysis and decision-making module 1013 are connected by a first internal cable 1014. The rock and soil layer parameter analysis and decision-making module 1013 is powered by an internal battery and has a wireless transceiver communication function. The collected data of the RI-CPTU probe 1011 is transmitted and fed back to the rock and soil layer parameter analysis and decision-making module 1013 through the first internal cable 1014 for processing and analysis, and then the processed and analyzed data is fed back to the intelligent grouting control cabinet 5 through the wireless transceiver communication function. The intelligent sensing rock breaking device 101 is connected to the intelligent pressure-reducing and integrated grouting device 102 by a first hollow bolt 1015.

[0056] Refer to Figure 2 and Figure 5 , manufacture the intelligent variable-speed pressure-reducing and integrated grouting device 102, which includes a cutting tool disc 1021, an integrated grouting device base pipe 1022, a grout outlet hole 1023, a grouting parameter sensing module 1024, a first sealing rubber ring 1025, rotor blades 1026, a magnetic coupling type regulator 1027, a rotation speed sensor 1028, a second hollow bolt 1029, cutting blades 10211, a first electromagnetic buckle 10212, and a cutting blade base 10213. The first sealing rubber ring 1025 on the intelligent variable-speed pressure-reducing and integrated grouting device 102 is flush with the end of the micro steel pipe pile 3. The cutting tool disc 1021, the integrated grouting device base pipe 1022, and the grout outlet hole 1023 on the intelligent variable-speed pressure-reducing and integrated grouting device 102 are located outside the end of the micro steel pipe pile 3 to facilitate intelligent cutting and grouting operations in the rock and soil layer. The cutting tool disc 1021 is made of cemented carbide and is used for cutting the rock and soil layer. The first electromagnetic buckle 10212 is integrated on the cutting blade base 10213, and the cutting blades 10211 are fixed on the cutting blade base 10213 by the first electromagnetic buckle 10212 to form the cutting tool disc 1021. After the construction is completed, when recovering the intelligent variable-speed pressure-reducing and integrated grouting device 102, an unlocking instruction is sent to the first electromagnetic buckle 10212 through the intelligent grouting control cabinet 5 to make the cutting blades 10211 fall off, avoiding the cutting blades 10211 from hindering the recovery of the intelligent variable-speed pressure-reducing and integrated grouting device 102 from the micro steel pipe pile 3 by lifting.

[0057] The integrated grouting device base pipe 1022 can be used as an installation base and a grouting pipe. The slurry outlet holes 1023 are arranged on the integrated grouting device base pipe 1022 in a cross-symmetrical manner, and the cement slurry is pressed into the rock and soil layer through the slurry outlet holes 1023. The grouting parameter sensing module 1024 is powered by a built-in battery and has a wireless transceiver communication function, and can feedback the slurry parameters (slurry pressure P, slurry flow velocity V, slurry flow rate Q) monitored in the intelligent variable-speed cutting and pressure-reducing integrated grouting device 102 to the intelligent grouting control cabinet 5 in real time. The first sealing rubber ring 1025 plays a role in sealing and supporting, preventing external cement slurry from infiltrating into the inside of the micro steel pipe pile, and at the same time supporting the gap between the intelligent variable-speed cutting and pressure-reducing integrated grouting device 102 and the micro steel pipe pile 3, avoiding the shaking of the intelligent variable-speed cutting and pressure-reducing integrated grouting device 102 in the micro steel pipe pile 3.

[0058] The rotor blades 1026 are installed on the inner wall of the integrated grouting device base pipe 1022 through a rotating shaft, and the angle of its rotor blades can be adjusted by a magnetic coupling type regulator 1027. The magnetic coupling type regulator 1027 is powered by a built-in battery and has a wireless transceiver communication function, and can receive the control instructions of the intelligent grouting control cabinet 5 in real time to control the rotor blades 1026. One magnetic coupling type regulator 1027 is correspondingly arranged for each rotor blade 1026. The internal energy driving principle is widely used in weapon launching engineering. The internal energy driving principle means that when driving a certain component on a launching device to rotate, the energy for driving the rotation of the component comes from the kinetic energy contained in the medium itself launched by the launching device, and there is no need to additionally set an external driving device to drive the rotation of the component. The rotor blades 1026 play a role in kinetic energy conversion. The rotational energy of the traditional cutting cutter head comes from the drive of an external motor or internal combustion engine (external energy). Through the rotor blades 1026, the flowing kinetic energy contained in the cement slurry itself is converted into the rotational kinetic energy of the cutting cutter head 1021 (internal energy), and the cutting cutter head 1021 can be rotated without additionally setting an external driving energy. According to the current specification, the grouting pressure during construction usually reaches 2 - 10 MPa, and the kinetic energy of the slurry is sufficient to drive the cutter head to rotate.

[0059] The specific working principle is as follows: The cutting power of the cutting cutter head 1021 comes from the fluid kinetic energy contained in the high-pressure cement slurry in the intelligent cutting and pressure-reducing integrated grouting device 102. The high-speed flowing cement slurry drives the rotor blades 1026 to rotate, and then the rotor blades 1026 drive the cutting cutter head 1021 to rotate through the integrated grouting device base pipe 1022. The rotating cutting cutter head 1021 can cut different rock and soil layers. The rotation speed sensor 1028 is powered by a built-in battery and has a wireless transceiver communication function, and can feedback the rotation speeds of the cutting cutter head 1021 and the rotor blades 1026 sensed in real time to the intelligent grouting control cabinet 5; according to the principle of the same angular velocity, the cutting cutter head 1021 and the rotor blades 1026 with a rotating shaft have the same rotation speed when rotating.

[0060] During the construction process, when the intelligent grouting control cabinet 5 receives the real-time parameters of the rock and soil layer and the cutting speed feedback from the intelligent sensing rock breaker 101 and the revolution sensor 1028 respectively, it sends an adjustment instruction to the magnetic coupling regulator 1027, and corrects the blade angle of the rotor blade 1026 (i.e., adjusts the kinetic energy conversion rate of the cement slurry) through the magnetic coupling regulator 1027, so as to intelligently adjust the cutting speed of the cutting cutter head 1021. According to the optimal cutting speed corresponding to the rock and soil layer where the cutting cutter head 1021 is located, the cutting speed of the cutting cutter head 1021 is kept within the corresponding speed range. The intelligent variable-speed cutting and grouting integrated grouting device 102 is connected to the reusable multi-functional rolling bearing 103 through the second hollow bolt 1029.

[0061] Refer to Figure 2 、 Figure 6 and Figure 7 respectively manufacture the reusable multi-functional rolling bearing 103 and the plug-in sealed grouting joint 104. The reusable multi-functional rolling bearing 103 includes a second electromagnetic buckle 1031, a roller bearing 1032 and a first built-in grouting pipe 1033. The plug-in sealed grouting joint 104 includes a second built-in grouting pipe 1041, a second sealing rubber ring 1042, an outer sleeve O-shaped plug 1043 and a control signal relay module 1044. The reusable multi-functional rolling bearing 103 and the plug-in sealed grouting joint 104 are located inside the micro steel pipe pile 3. These two devices can keep the external grouting pipe 2 from rotating and deforming when the internal energy type intelligent cutting and grouting integrated grouting device 1 rotates and cuts the rock and soil body and conducts the grouting operation.

[0062] The reusable multi-functional rolling bearing 103 has a recoverable function. When lifting and recovering the grouting device after the construction is completed, the intelligent grouting control cabinet 5 sends an unlocking instruction to the second electromagnetic buckle 1031, and the second electromagnetic buckle 1031 releases the clamping connection state with the micro steel pipe pile 3, and the internal energy type intelligent cutting and grouting integrated grouting device 1 is lifted and recovered to the ground from inside the micro steel pipe pile 3. The plug-in sealed grouting joint 104 is connected to the reusable multi-functional rolling bearing 103 through the outer sleeve O-shaped plug 1043. The control signal relay module 1044 plays the role of relaying, receiving, converting and amplifying the wireless signal. The control signal relay module 1044 can receive the wireless signals sent by the rock and soil layer parameter analysis and decision-making module 1013, the coupling regulator 1027 and the revolution sensor 1028, convert and amplify the information into a wired signal and then feedback it to the intelligent grouting control cabinet 5 through the comprehensive control cable 4. Similarly, it can convert and amplify the control information sent by the intelligent grouting control cabinet 5 into a wireless signal and then send it to the coupling regulator 1027.

[0063] The plug - type sealed grouting joint 104 is connected to the external grouting pipe 2 by welding. The first internal grouting pipe 1033 and the second internal grouting pipe 1041 play the role of circulating the grout, and the second sealing rubber ring 1042 plays the role of preventing grout leakage. During cutting and grouting operations, the high - pressure grout in the external grouting pipe 2 flows through the second internal grouting pipe 1041, then into the first internal grouting pipe 1033, and then into the intelligent cutting - pressure integrated grouting device 102, and finally is pressed into the rock and soil layer through the grout outlet 1023.

[0064] Example 2

[0065] Refer to Figures 8 - 10 , this embodiment provides an intelligent grouting method for an internal - energy - type intelligent cutting - pressure integrated micro - steel - pipe pile grouting device.

[0066] During the grouting process of the micro - steel - pipe pile 3, the internal - energy - type intelligent cutting - pressure integrated micro - steel - pipe pile grouting device performs intelligent grouting in the following manner.

[0067] When the intelligent rock - breaking detector 101 touches a certain rock and soil layer during construction, it can analyze the type, distribution, and geological parameters of the rock and soil layer in real - time, and then feedback the processed and analyzed relevant data to the intelligent grouting control cabinet 5 through the wireless transceiver communication function.

[0068] After receiving the rock and soil layer data fed back by the intelligent rock - breaking detector 101, the intelligent grouting control cabinet 5 calculates the optimal grouting parameters applicable to the rock and soil layer according to the type, distribution, and geological parameters of the rock and soil layer, and automatically adjusts the grouting parameters of the cement grout to the optimal grouting parameters according to the type of the rock and soil layer to ensure that the grouting reinforcement effect of the rock and soil layer reaches the optimal.

[0069] When the internal - energy - type intelligent cutting - pressure integrated micro - steel - pipe pile grouting device is located in the soil layer, the slurry pressure P is adjusted in real - time according to the following calculation formula:

[0070]

[0071] In the formula, P is the slurry pressure; K1, K2, and K3 are correction coefficients. When the soil layer is a non - cohesive soil layer, K1 = 10.00, K2 = 0.55, K3 = 0.00; when the soil layer is a cohesive soil layer, K1 = 14.00, K2 = 2.30, K3 = 9.00; c is the cohesion of the soil layer; H is the buried depth of the rock and soil layer where the grouting position is located; γ is the average effective unit weight of each rock and soil layer above the grouting position; is the internal friction angle of the soil layer where the grouting position is located; the average effective unit weight γ, cohesion c, and internal friction angle in the above calculation parameters The soil layer burial depth H and other soil layer parameters can be sensed by the intelligent rock-breaking device 101 and automatically fed back to the intelligent grouting control cabinet 5 for setting and correction; while the calculation parameters K1, K2, and K3 are pre-entered into the AI program of the intelligent grouting control cabinet 5, and the intelligent grouting control cabinet 5 automatically sets according to the soil layer type fed back by the intelligent rock-breaking device 101; after obtaining the above calculation parameter values, the intelligent grouting control cabinet 5 can set and correct the slurry pressure P value in the intelligent pressure-reducing integrated grouting device 102 in real time according to formula (1).

[0072] Figure 8 and Figure 9 are the measured residual values of the slurry pressure obtained by applying the prediction formula of the present invention to the micro steel pipe piles in 6 actual projects. From Figure 8 and Figure 9 of the residual results, it can be seen that the distribution of the measured residual values of the slurry pressure in the soil layer is relatively uniform. Figure 8 The fitting accuracy R 2 of the unit linear regression analysis of the measured data in cohesionless soil is 0.914, and the fitting accuracy is good. The coefficient of variation of the calculation parameters K1 and K2 is lower than 0.1, indicating that the dispersion degree of the measured slurry pressure data is very low. Figure 9 The fitting accuracy R 2 of the unit linear regression analysis of the measured data in cohesive soil is 0.907, and the fitting accuracy is good. The coefficient of variation of K1, K2, and K3 is less than 0.3, and the dispersion degree of the measured slurry pressure data is good. The Figure 8 and Figure 9 The K1, K2, and K3 data of the measured slurry pressure data are inversely analyzed, and the results are shown in Tables 1 to 2. Tables 1 to 2 compare the linear regression analysis results of the measured inverse data of K1, K2, and K3 with the set values. The results show that the error range between the set value and the average value of the measured inverse data is 3.2% to 7.8%, and the prediction error is small.

[0073] Table 1 Comparison of the linear regression analysis results of the measured inverse data of the correction coefficients K1, K2, and K3 in the cohesionless soil layer with the set values

[0074]

[0075] Table 2 Comparison of the linear regression analysis results of the measured data of the correction coefficients K1, K2, and K3 in the cohesive soil layer with the set values

[0076]

[0077] When the internal energy type intelligent pressure-reducing integrated micro steel pipe pile grouting device is located in the rock layer, the slurry pressure P is adjusted in real time according to the following calculation formula:

[0078] P = K4γH + K5(RQD) (2)​

[0079] In the formula, P is the slurry pressure; K4 and K5 are correction factors, K4 = 3.20, K2 = 3500.00; RQD is the rock mass quality index; H is the burial depth of the rock layer where the grouting position is located; γ is the average effective unit weight of each rock and soil layer above the grouting position; the rock layer parameters such as the rock mass quality index RQD, the average effective unit weight γ, and the rock layer burial depth H in the above calculation parameters can be sensed by the intelligent rock-breaking device 101 and automatically fed back to the intelligent grouting control cabinet 5 for setting and correction; for the calculation parameters K4 and K5, they are input into the AI program of the intelligent grouting control cabinet 5 in advance, and the intelligent grouting control cabinet 5 automatically sets according to the rock layer information determined by the intelligent rock-breaking device 101. After obtaining the above calculation parameter values, the intelligent grouting control cabinet 5 can set and correct the slurry pressure P value in the intelligent pressure-reducing integrated grouting device 102 in real time according to formula (2).

[0080] Figure 10 are the measured residual values of the slurry pressure obtained by applying the prediction formula of the present invention to the micro steel pipe piles in 6 actual projects. From Figure 10 the residual results, it can be seen that the distribution of the measured residual values of the slurry pressure in the rock layer is relatively uniform. Figure 10 The fitting accuracy R of the unit linear regression analysis of the measured data in the rock layer 2 is 0.978, and the fitting accuracy is good. The coefficient of variation of the calculation parameters K1 and K2 is less than 0.1, indicating that the dispersion degree of the measured slurry pressure data is very low. Substitute Figure 10 the K4 and K5 data of the measured slurry pressure data in into the inversion analysis, and the obtained results are shown in Table 3. Table 3 compares the linear regression analysis results of the measured inversion data of K4 and K5 with the set values. The results show that the error range between the set value and the average value of the measured inversion data is less than 5.0%, and the prediction error is small.

[0081] Table 3 Linear regression analysis results of the correction factors K4 and K5 in the rock layer

[0082]

[0083] The slurry flow velocity V and the slurry flow rate Q of the cement slurry in the intelligent pressure-reducing integrated grouting device 102 can be converted according to the slurry pressure P. The calculation formulas for the slurry flow velocity V and the slurry flow rate Q are as follows:

[0084]

[0085] In the formula, V is the slurry flow velocity; Q is the slurry flow rate; P is the slurry pressure; P s is the hydrostatic pressure of the rock and soil layer where the grouting position is located; D is the inner diameter of the grouting pipe at the position where the slurry is located; the hydrostatic pressure P in the above calculation parameters sParameters of rock and soil layers, etc. can be sensed by the intelligent rock-breaking device 101 and automatically fed back to the intelligent grouting control cabinet 5 for setting and correction; while the slurry pressure P is automatically set and corrected in real time by the intelligent grouting control cabinet 5 according to the actual feedback working conditions; for calculation parameters such as slurry density ρ and the inner diameter D of each part of the grouting pipe, they are input into the intelligent grouting control cabinet 5 in advance according to the actual working conditions; after the intelligent grouting control cabinet 5 obtains the above calculation parameter values, it can obtain the slurry flow velocity V and slurry flow rate Q in real time according to formula (3).

[0086] Embodiment 3

[0087] Refer to Figures 11 - 12 , this embodiment provides an intelligent rock-cutting method for an internal energy type intelligent cutting and pressure-reducing integrated micro steel pipe pile grouting device for cutting rock and soil mass.

[0088] During the grouting and cutting process of the micro steel pipe pile 3, the internal energy type intelligent cutting and pressure-reducing integrated micro steel pipe pile grouting device cuts the rock and soil mass intelligently in the following manner.

[0089] The cutting speed of the cutting cutter head 1021 can be intelligently adjusted variably according to the actual situation of the rock and soil layer where the cutting cutter head 1021 is located. The rotor blade 1026 plays a role in kinetic energy conversion. The high-pressure cement slurry flowing in the intelligent cutting and pressure-reducing integrated grouting device 102 drives the rotor blade 1026 to rotate. The rotor blade 1026 drives the cutting cutter head 1021 to rotate through the integrated grouting device base pipe 1022, so that the cutting cutter head 1021 cuts different rock and soil layers.

[0090] When the intelligent rock-breaking device 101 touches a certain rock and soil layer during the construction process, the intelligent rock-breaking device 101 feeds back the type, distribution and geological parameters of the rock and soil layer to the intelligent grouting control cabinet 5 in real time, and the rotation speed sensor 1028 feeds back the cutting speed of the cutting cutter head 1021 to the intelligent grouting control cabinet 5 in real time.

[0091] The intelligent grouting control cabinet 5 issues an adjustment instruction to the magnetic coupling type regulator 1027 according to the real-time cutting speed of the cutting cutter head 1021 and the type of the rock and soil layer where it is located. By changing the blade angle and attitude of the rotor blade 1026 through the magnetic coupling type regulator 1027, the rotation speed of the rotor blade 1026 in the high-speed flowing cement slurry is changed, and then the cutting speed of the cutting cutter head 1021 is changed, so that the cutting speed of the cutting cutter head 1021 is maintained within the corresponding optimal rotation speed range.

[0092] The rotation speeds of the cutting cutter head 1021 and the rotor blade 1026 can be calculated according to the grouting parameters. When the grouting operation is stable, it can be considered that the cement slurry flows at a constant speed and in a fixed direction. Driven by the high-pressure slurry, the rotation speeds of the cutting cutter head 1021 and the rotor blade 1026 are the same. The calculation formula for the rotation speed n of the cutting cutter head 1021 and the rotor blade 1026 is as follows:

[0093]

[0094] Wherein, n is the rotational speed of the cutting cutter head 1021 and the rotor blade 1026, D is the inner diameter of the grouting pipe at the position where the rotor blade 1026 is located; N y is the number of blades on the rotor blade 1026; S y is the vertical projected area of a single blade on the rotor blade 1026; β is the angle between the normal of the blade centroid point of the rotor blade 1026 and the slurry flow direction; V is the slurry flow velocity; f is the fluid property calculation coefficient, which can be determined by pre-test debugging.

[0095] Figure 11 is a comparison diagram of the actual value and the predicted value of the rotational speed of the cutting cutter head 1021 obtained by applying the prediction formula of the present invention to the micro steel pipe pile 3 in actual engineering. Figure 11 Taking the predicted value as the reference line, the accuracy rate within the range of ±20% deviation on both sides of the predicted value reference line for the measured value can reach about 84%. Figure 12 is a comparison diagram of the measured value and the predicted value of the relationship between the rotor speed ratio and the blade angle of the rotor blade 1026 obtained by applying the prediction formula of the present invention to the micro steel pipe pile 3 in actual engineering. Figure 12 Taking the predicted value as the reference line, the accuracy rate within the range of ±20% deviation on both sides of the predicted value reference line for the measured value can reach about 90%.

[0096] Example 4

[0097] Refer to Figure 1 and Figure 13 For the construction method of an internal energy type intelligent cutting and pressing integrated micro steel pipe pile grouting device of the present invention, the implementation steps are as follows:

[0098] a. Determine the predetermined construction point of the micro steel pipe pile 3 equipped with the internal energy type intelligent cutting and pressing integrated grouting device, level the micro steel pipe pile 3 and control the deviation of the pile body verticality to be less than 1%, and prepare to carry out construction operations on the micro steel pipe pile 3 equipped with the internal energy type intelligent cutting and pressing integrated grouting device;

[0099] b. First, conduct a water pressure test with clean water to check whether the internal energy type intelligent cutting and pressing integrated grouting device is normal. After the inspection, first drive the cutting cutter head 1021 on the intelligent cutting and pressing integrated grouting device 102 to rotate with clean water as the grouting medium. Control the rotation speed of the cutting cutter head 1021 by the intelligent grouting control cabinet 5 to be 120 r / min, and press the micro steel pipe pile 3 equipped with the internal energy type intelligent cutting and pressing integrated grouting device into the soil by about 0.2 m at a pile sinking speed of 2 m / h;

[0100] c. After completing the above steps, change the grouting medium from clear water to cement slurry. When encountering different types of rock and soil layers during the operation, the intelligent grouting control cabinet 5 respectively sets and controls the rotation speed of the cutting cutter head 1021 and the pile sinking speed of the micro steel pipe pile 3 according to the parameters in Table 4. Under the intelligent command of the intelligent grouting control cabinet 5, the soil cutting and grouting operations are carried out simultaneously. The cut rock and soil debris are mixed with the cement slurry to form a cement-soil solidified body covering the pile body surface.

[0101] d. After the construction is completed, send an unlocking command to the first electromagnetic buckle 10212 and the second electromagnetic buckle 1031 through the intelligent grouting control cabinet 5; release the clamping state of the first electromagnetic buckle 10212 to make the cutting blade 10211 fall off from the internal energy type intelligent cutting and pressing integrated grouting device 1; release the clamping state of the second electromagnetic buckle 1031 to unlock the clamping connection between the internal energy type intelligent cutting and pressing integrated grouting device 1 and the micro steel pipe pile 3. After completing the above steps, lift and recover the internal energy type intelligent cutting and pressing integrated grouting device 1.

[0102] Table 4 Rotation speed of cutting cutter head and pile sinking speed of micro steel pipe pile in different rock and soil layers

[0103]

[0104] The above is a detailed introduction to the solution provided by the embodiments of the present invention. It is not a limitation to the present invention in any form. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, based on the technical essence of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiments shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. An internal energy type intelligent cutting and pressing integrated micro steel pipe pile grouting device, characterized in that: The invention comprises an internal energy type intelligent integrated grouting device (1), an external grouting pipe (2), a micro steel pipe pile (3), an integrated control cable (4) and an intelligent grouting control cabinet (5); the internal energy type intelligent integrated grouting device (1) comprises an intelligent sensing rock breaker (101), an intelligent integrated grouting device (102), a reusable multifunctional rolling bearing (103) and a latch-type sealed grouting joint (104); The intelligent sensing rock breaker (101) is connected to the intelligent integrated cutting and pressing grouting device (102) via a first hollow bolt (1015); the tail of the intelligent integrated cutting and pressing grouting device (102) is inserted into the end of the micro steel pipe pile (3) and connected to the reusable multifunctional rolling bearing (103) via a second hollow bolt (1029); the reusable multifunctional rolling bearing (103) is fixed to the inner wall of the micro steel pipe pile (3) via a second electromagnetic buckle (1031); the reusable multifunctional rolling bearing (103) is connected to the external grouting pipe (2) via a latch-type sealed grouting joint (104); and the intelligent grouting control cabinet (5) controls the intelligent integrated cutting and pressing grouting device (102) and the reusable multifunctional rolling bearing (103) via control instructions.

2. According to claim 1, an internal energy type intelligent cutting and pressing integrated micro steel pipe pile grouting device is characterized in that: The intelligent sensing rock breaker (101) comprises a RI-CPTU probe (1011), a soil guide baffle (1012), a rock and soil layer parameter analysis and decision module (1013), a first built-in cable (1014) and a first hollow bolt (1015); the intelligent sensing rock breaker (101) has a geological parameter inversion function and can determine in real time the distribution and property changes of the rock layer or soil layer faced by the micro steel pipe pile (3) during the pile sinking, cutting and grouting processes.

3. According to claim 2, an internal energy type intelligent cutting and pressing integrated micro steel pipe pile grouting device is characterized by: The intelligent integrated cutting and pressing grouting machine (102) comprises a cutting disc (1021), an integrated grouting machine base tube (1022), a grouting hole (1023), a grouting parameter sensing module (1024), a first sealing rubber ring (1025), a rotor blade (1026), a magnetic coupling regulator (1027), a rotation speed sensor (1028) and a second hollow bolt (1029); the cutting blade (10211) is fixed to the cutting blade base (10213) by a first electromagnetic buckle (10212) to form a cutting disc (1021); the blade angle and posture of the rotor blade (1026) can be adjusted by the magnetic coupling regulator (1027).

4. An intelligent grouting method, characterized in that: An internal energy type intelligent integrated cutting and pressing micro steel pipe pile grouting device according to claim 2 specifically comprises the following steps: The intelligent sensing rock breaker (101) feeds back the type, distribution and geological parameters of the rock and soil layers to the intelligent grouting control cabinet (5) in real time; the intelligent grouting control cabinet (5) intelligently adjusts the grouting parameters according to the fed back rock and soil layer data.

5. The intelligent grouting method according to claim 4, characterized in that: When the internal energy type intelligent integrated cutting and compression micro steel pipe pile grouting device is located in the soil layer, the grouting pressure P is adjusted in real time according to the following calculation formula: Where, P is the grout pressure; K1, K2 and K3 are correction coefficients; c is the cohesion of the soil layer; H is the burial depth of the soil layer where the grouting position is located; γ is the average effective weight of each rock and soil layer above the grouting position; is the internal friction angle of the soil layer where the grouting location is located.

6. The intelligent grouting method according to claim 4, characterized in that: When the internal energy type intelligent integrated cutting and compression micro steel pipe pile grouting device is located in the rock layer, the grouting pressure P is adjusted in real time according to the following calculation formula: P=K4γH+K5(RQD) Where P is the grouting pressure; K4 and K5 are correction coefficients; RQD is the rock quality index; H is the burial depth of the rock layer where the grouting position is located; γ is the average effective weight of each rock and soil layer above the grouting position.

7. An intelligent grouting method according to claim 5 or 6, characterized in that: The slurry flow rate V and slurry flow rate Q of the high-pressure cement slurry in the intelligent integrated cutting and pressing grouting device (102) can be converted according to the slurry pressure P. The calculation formulas of the slurry flow rate V and the slurry flow rate Q are as follows: Where, V is the slurry velocity; Q is the slurry flow rate; P is the slurry pressure; P s is the hydrostatic pressure of the rock and soil layer where the grouting position is located; D is the inner diameter of the grouting pipe where the slurry is located.

8. An intelligent method for cutting rock and soil, characterized in that: An internal energy type intelligent integrated cutting and pressing micro steel pipe pile grouting device according to claim 3 specifically comprises the following steps: The intelligent sensing rock breaker (101) provides real-time feedback of the type, distribution and geological parameters of the rock and soil layer to the intelligent grouting control cabinet (5); the speed sensor (1028) provides real-time feedback of the cutting speed of the cutting disc (1021) to the intelligent grouting control cabinet (5); the intelligent grouting control cabinet (5) issues an adjustment instruction to the magnetic coupling regulator (1027) to change the blade angle, posture and speed of the rotor blade (1026); the rotor blade (1026) with the changed speed drives the cutting disc (1021) to change the cutting speed through the integrated grouting device base tube (1022).

9. The intelligent method for cutting rock and soil according to claim 8, characterized in that: The speed n of the cutting disc (1021) and the rotor blade (1026) is calculated using the following formula: Wherein, n is the rotation speed of the cutting disc (1021) and the rotor blade (1026), and D is the inner diameter of the grouting pipe at the location of the rotor blade (1026); N y is the number of blades on the rotor blade (1026); S y is the vertical projection area of ​​a single blade on the rotor blade (1026); β is the angle between the normal direction of the blade centroid point of the rotor blade (1026) and the slurry flow direction; V is the slurry flow rate; and f is the fluid property calculation coefficient.

10. A construction method of an internal energy type intelligent integrated cutting and pressing micro steel pipe pile grouting device, characterized in that: An internal energy type intelligent integrated cutting and compression micro steel pipe pile grouting device according to any one of claims 1 to 3 comprises the following steps: a. After determining the scheduled construction site, install the internal energy-based intelligent integrated grouting device (1) into the micro steel pipe pile (3) to control the verticality of the pile body in preparation for pile sinking construction; b. Conduct a clean water pressure test, using clean water as the grouting medium to check whether the internal energy type intelligent cutting and pressure integrated grouting device (1) is working properly, and control the number of rotations of the cutting disc (1021) through the intelligent grouting control cabinet (5), and press the micro steel pipe pile (3) equipped with the internal energy type intelligent cutting and pressure integrated grouting device (1) into the soil; c. Carry out formal construction work, replace the grouting medium from clean water to cement slurry, and the intelligent grouting control cabinet (5) controls the rotation speed of the cutting disc (1021) and the pile sinking speed of the micro steel pipe pile (3), and performs cutting and grouting operations simultaneously during the pile sinking process; d. After the construction is completed, an unlocking command is sent to the first electromagnetic buckle (10212) and the second electromagnetic buckle (1031) through the intelligent grouting control cabinet (5), the first electromagnetic buckle (10212) and the second electromagnetic buckle (1031) are released from the fixed state, and the internal energy recovery type intelligent cutting and pressing integrated grouting device (1) is lifted up.

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