Cement-soil mixing pile construction control system and control method based on soil texture self-adaption

Abstract

The invention discloses a soil texture self-adaption-based cement-soil mixing pile construction control system and method. The system comprises a depth sensor and a speed sensor which are mounted on a drill rod of a cement-soil mixing pile construction drilling machine; a slurry spraying pressure sensor is mounted at the cement slurry pump; the drilling machine control module is connected with a depth sensor and a speed sensor; the cement slurry pump control module is connected with the pressure sensor, and in the drilling process of the stirring drill rod, the drilling machine control module controls the drill rod to drill at constant power, records the drilling speed in real time and stores the drilling speed and depth; during lifting, the drilling machine control module controls the lifting speed based on the drilling speed and depth, the cement slurry pump control module controls the slurry spraying pressure based on the drilling speed, and if the soil body of the corresponding depth section is hard and the drilling speed is slow, the lifting speed is slowed down, and the slurry spraying pressure is increased; on the contrary, if the soil body of the corresponding depth section is soft and the drilling speed is high, the lifting speed is increased, and the guniting pressure is reduced.

Description

Technical Field

[0001] The present invention relates to a soil-self-adaptive cement-soil mixing pile construction control system and a control method thereof, belonging to the field of cement mixing pile construction equipment, including a construction control system and a control method thereof. Background Art

[0002] The soil layer distribution in the Yellow River flooding area is complex, mostly interlayered with silt, clay, and silty clay. Traditional mixing pile construction technology is difficult to adapt to complex soil layers. However, special-shaped columns such as cylindrical piles, nail-type piles, bamboo piles, and variable-section cylindrical piles have excellent pile quality due to their reasonable structure and the ability to adjust structural parameters in a targeted manner according to the local stratum distribution. However, the construction process of special-shaped mixing piles is complicated, requiring manual adjustment of construction parameters many times, and the traditional mixing pile construction is manually controlled throughout the process, with many human factors interfering and high labor costs, which seriously affects the quality of the mixing pile foundation reinforcement in the Yellow River flooding area, causing a large number of engineering problems and material waste. There is no reliable control system and control method for the construction process of special-shaped cement soil mixing piles that can ensure the quality of mixing piles in soft foundations in the Yellow River flooding area. Summary of the invention

[0003] In order to solve the technical problems existing in the prior art, the present invention proposes a soil-self-adaptive cement-soil mixing pile construction control system and a control method thereof.

[0004] The technical solution adopted by the present invention is as follows:

[0005] In a first aspect, the present invention provides a soil-adaptive cement-soil mixing pile construction control system comprising:

[0006] Depth sensor and speed sensor installed on the drill rod of cement soil mixing pile construction drilling rig;

[0007] Install the shotcrete pressure sensor at the cement slurry pump;

[0008] And a control system, the control system includes a drilling rig control module and a cement slurry pump control module; the drilling rig control module is connected to a depth sensor and a speed sensor; the cement slurry pump control module is connected to a pressure sensor, during the drilling process of the mixing drill rod, the drilling rig control module controls the drill rod to maintain constant power while drilling, and records the drilling speed in real time during the drilling process, stores the drilling speed and drilling depth, and establishes a corresponding relationship between the depth and the speed; during lifting, the drilling rig control module controls the lifting speed based on the drilling speed and depth, and the cement slurry pump control module controls the shotcrete pressure based on the drilling speed, if the soil in the corresponding depth section is harder and the drilling speed is slow, then the lifting speed will be slowed down and the shotcrete pressure will be increased; on the contrary, if the soil in the corresponding depth section is softer and the drilling speed is fast, then the lifting speed will be accelerated and the shotcrete pressure will be reduced.

[0009] As a further technical solution, the control system is installed in a protective shell, and heat dissipation holes are provided on the protective shell.

[0010] As a further technical solution, a display screen is arranged on the protective shell.

[0011] As a further technical solution, a manual control knob and an automatic control knob are provided on the protective shell.

[0012] As a further technical solution, the control system further includes a slurry delivery path switching control module, and the slurry delivery path switching control module realizes the switching between slurry and clean water.

[0013] In the second aspect, the control method of the soil-adaptive cement-soil mixing pile construction control system of the present invention is as follows:

[0014] The drilling rig control module controls the drilling rig to start and drill. During the drilling process, the depth sensor and the speed sensor collect the drilling depth and the drilling speed in real time. The drilling rig control module stores the collected data and establishes a corresponding relationship between the depth and the speed.

[0015] When the drilling rig reaches the set depth, the drilling rig is lifted up. During the lifting process, both the drilling rig control module and the cement slurry pump control module are turned on, and the drilling rig control module controls the lifting speed based on the drilling speed and the drilling depth, and the cement slurry pump control module controls the shotcrete pressure based on the drilling speed and the drilling depth. If the soil in the corresponding depth section is hard and the drilling speed is slow, the lifting speed will slow down and the shotcrete pressure will increase. On the contrary, if the soil in the corresponding depth section is soft and the drilling speed is fast, the lifting speed will speed up and the shotcrete pressure will decrease.

[0016] As a further technical solution, the shotcrete pressure input range is 0-30MPa, and varies within this range during construction. According to field test data statistics, the optimal shotcrete pressure is a linear function of the drilling speed, and the expression is as follows:

[0017] P=a*V 下 +b

[0018] Where P is the shotcrete pressure, V 下 is the drilling speed, which is obtained by real-time monitoring of the control system; a and b are control parameters. According to field test statistics, the value of a is -0.25≤a≤-0.15, and the value of b is 25≤b≤30. The specific values ​​can be determined according to the site conditions during construction.

[0019] As a further technical solution, the input range of the drill lifting speed is 0-150cm / min, and it changes within this range during construction. According to the statistics of field test data, the optimal drill lifting speed is a linear function of the drill lowering speed, and the expression is as follows:

[0020] V 上 =c*V 下 +d

[0021] Where V 上 is the drilling speed, V 下 is the drilling speed, which is obtained by real-time monitoring of the control system; c and d are control parameters. According to the statistics of field tests, the value of c is 0.8≤d≤1, and the value of d is 6≤d≤14. The specific values ​​can be selected according to the site conditions during construction.

[0022] As a further technical solution, after the construction of the mixing pile is completed, the slurry pipe is switched to clean water to flush the grouting holes.

[0023] As a further technical solution, the slurry delivery pipe switching is achieved by a slurry delivery path switching control module.

[0024] The beneficial effects of the present invention are as follows:

[0025] The present invention realizes the construction of mixing piles based on different soils by jointly controlling the drilling and lifting processes, and determining the control parameters of the lifting process according to the drilling parameters; the slurry pressure and speed-up parameters at various depths during the construction of cement-soil mixing piles are controlled by the control system. The construction parameters of special-shaped piles are precisely controlled, the quality of piles is greatly improved, and the foundation reinforcement effect is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 , Figure 2 A side view of a control system for advanced control of the cement-soil mixing pile construction process proposed by the present invention;

[0027] Figure 3 A schematic diagram of a control system console for advanced control of the cement-soil mixing pile construction process proposed by the present invention;

[0028] Figure 4 A schematic diagram of a shotcrete pressure control module of a control system for advanced control of a cement-soil mixing pile construction process proposed by the present invention;

[0029] Figure 5 A schematic diagram of the stirring control module proposed in the present invention;

[0030] Figure 6 This is a schematic diagram of the slurry delivery path switching module proposed in the present invention;

[0031] In the figure: 1-protective shell, 2-heat dissipation vent, 3-control system power line and data line, 4-touch screen, 5-automatic control module, 6-manual control module, 7-cement slurry pump, 8-pressure sensor, 9-slurry pressure control power line and data line, 10-cement slurry pump control module, 11-drill rod control power line and data line, 12-drill rod, 13-speed sensor, 14-depth sensor, 15-cement slurry mixing bucket, 16-clean water bucket, 17-control valve, 18-valve plate. DETAILED DESCRIPTION

[0032] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0034] The embodiment of the present invention discloses a soil-adaptive cement-soil mixing pile construction control system and a control method thereof. By connecting sensors and signal receivers and accessing an electronic control system, the real-time control of the grouting pressure, lifting speed, and grouting path of the entire cement-soil mixing pile construction process, as well as the real-time detection of the mixing depth and cement dosage can be realized. The control system is wrapped by an aluminum shell for the protection and placement of internal instruments, and a heat dissipation vent is arranged on the outside for heat dissipation during the operation of the equipment. A host and a data integration system are installed inside for real-time collection and control of various parameters in the cement-soil mixing pile construction process. A friction touch screen and a manual knob are arranged above the control system for displaying and controlling various parameters in the cement-soil mixing pile construction process. The control system is connected to an external data line, and a depth sensor and a speed sensor are installed at the drill rod of the cement-soil mixing pile construction machine; a speed controller is installed at the background; a grouting pressure sensor and a cement slurry pump power controller are installed at the cement slurry pump; and a slurry path controller is installed at the end of the slurry delivery pipe. The depth sensor, speed sensor, and pressure sensor are used for real-time monitoring of the drill rod depth, drilling speed, and slurry pressure during the construction of cement-soil mixing piles. The speed controller, cement slurry pump power controller, and slurry path controller are used for the drilling speed, grouting pressure, and slurry path switching during the construction of cement-soil mixing piles. The switching of the slurry path refers to the switching of the slurry pipe from conveying cement slurry to conveying clean water. After the construction of cement-soil mixing piles is completed, there is still residual cement slurry in the slurry pipe and nozzle. If it is not cleaned for a long time, it will cause blockage, so it is necessary to rinse the slurry pipe and nozzle with clean water after construction.

[0035] Specifically, the following is combined with the attached Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, this embodiment is described;

[0036] This embodiment discloses a soil-adaptive cement-soil mixing pile construction control system, comprising an aluminum housing 1, a friction touch screen, a manual knob, a data transmission line, a depth sensor, a speed sensor, a shotcrete pressure sensor, a drilling rig control module, a cement slurry pump control module, a slurry path controller, etc.;

[0037] Specifically, Figure 1 , Figure 2 As shown, the control system is wrapped by an aluminum protective shell 1, which is used to protect and place the internal instruments. A heat dissipation vent 2 is set on the outside to dissipate heat during the operation of the equipment. The control system and data integration system are installed inside. Figure 1The control system power line and data line 3 are shown in the figure, which are used for real-time acquisition and control of various parameters in the cement soil mixing pile construction process. A friction touch screen 4, an automatic control module 5 and a manual control module 6 are arranged above the control system, which are used for displaying and controlling various parameters in the cement soil mixing pile construction process. For details, see Figure 3 Among them, the touch screen 4 can display and control the construction parameters in real time, and can store the construction parameters; the manual control module 6 includes a manual speed-up button, a manual slurry pressure control button, a manual drill speed, a manual drill speed, a manual slurry delivery path switching button, etc.; the automatic control module 5 includes an automatic opening module and an automatic closing module.

[0038] like Figure 5 As shown, the control system is connected to an external data line, and a depth sensor 14 and a speed sensor 13 are installed at the drill rod 12 of the cement soil mixing pile construction machine; a drilling rig control module is in the control system, and the drilling rig control module is connected to the drill rod through a drill rod control power line, and the depth sensor 14 and the speed sensor 13 are connected to the drilling rig control module through a data line. The control and data lines refer to the drill rod control power line and data line 11.

[0039] like Figure 4 As shown, a grouting pressure sensor 8 and a grout pump control module 10 are installed at the grout pump 7; the grout pump control module is installed at the end of the slurry delivery pipe and is connected via a slurry pressure control power line and a data line 9.

[0040] like Figure 6 As shown, the slurry path switching module refers to the switching of the slurry pipe from conveying cement slurry to conveying clean water. After the construction of the cement soil mixing pile is completed, there is still residual cement slurry in the slurry pipe and nozzle. If it is not cleaned for a long time, it will cause blockage. Therefore, it is necessary to flush the slurry pipe and nozzle with clean water after construction. The control system can realize real-time monitoring and visual control of construction parameters in the whole process of cement soil mixing pile construction, effectively ensure the construction quality of cement soil mixing pile, and reduce labor costs; specifically, the slurry path switching module includes a cement slurry mixing bucket 15, a clean water bucket 16, a control valve 17 and a valve plate 18; after the control valve 17 receives the instruction transmitted by the slurry path switching control module, the control valve plate 18 rotates to realize the switching of slurry\clean water in the slurry pipe.

[0041] The above-mentioned depth sensor 14, speed sensor 13, and shotcrete pressure sensor 8 are respectively used for real-time monitoring of drill rod depth, drilling speed, and slurry pressure during the construction of cement soil mixing piles; the drilling rig control module, cement slurry pump control module 10, and slurry delivery path switching control module are respectively used for adjusting the drilling speed and shotcrete pressure during the construction of cement soil mixing piles, as well as switching the slurry path. The drilling rig control module is connected to the depth sensor and the speed sensor; the cement slurry pump control module is connected to the pressure sensor. During the drilling process of the mixing drill rod, the drilling rig control module controls the drill rod to maintain constant power and records the drilling speed in real time, stores the drilling speed and drilling depth, and establishes a corresponding relationship between the depth and speed. When lifting, the drilling rig control module controls the lifting speed based on the drilling speed and depth, and the cement slurry pump control module controls the shotcrete pressure based on the drilling speed. If the soil in the corresponding depth section is hard and the drilling speed is slow, the lifting speed will slow down and the shotcrete pressure will increase. On the contrary, if the soil in the corresponding depth section is soft and the drilling speed is fast, the lifting speed will speed up and the shotcrete pressure will decrease.

[0042] High-quality pile construction in different soil layers can be achieved by controlling the injection grout pressure and lifting speed during pile construction. The purpose of hole cleaning can be achieved by automatically controlling the switching between cement slurry and clean water in the grouting pipe. Real-time monitoring of grouting pressure, construction depth, and drilling speed during mixing pile construction can be achieved through grouting pressure sensors, depth sensors, and speed sensors. Grouting pressure can be controlled by controlling the input power of the cement slurry pump.

[0043] In the second aspect, based on the above control system for advanced control of the cement soil mixing pile construction process, the present invention also proposes a control method:

[0044] During the drilling process of the mixing drill bit, the control system controls the drill rod to maintain constant power while drilling, and records the drilling speed in real time during the drilling process, and stores the drilling speed and drilling depth information; and establishes the relationship between the drilling speed and the drilling depth, that is, records the drilling speed corresponding to any depth; for example, when the drilling depth is 10m, the corresponding drilling speed is 15cm / min; when the drilling depth is 15m, the corresponding drilling speed is 25cm / min; and so on. According to this method, the drilling speed corresponding to any depth is recorded;

[0045] During the lifting process, the control system adjusts the lifting speed and the shotcrete pressure based on the change in the drilling speed during the drilling process.

[0046] The principle of the above method is: maintain constant power during the drilling process, then the hardness of the soil can be intuitively reflected by the drilling speed. The harder the soil, the more difficult it is to form a pile, and the slower the drilling speed; conversely, the softer the soil, the easier it is to form a pile, and the faster the drilling speed.

[0047] When lifting, the lifting speed and shotcrete pressure are adjusted based on the drilling speed. If the soil at a certain depth is harder and the drilling speed is slow, the lifting speed will slow down and the shotcrete pressure will increase to obtain a larger cement content, ensuring that piles can be successfully formed in harder soil.

[0048] On the contrary, if the soil at a certain depth is relatively soft, the drilling speed is slow, the lifting speed is accelerated, and the shotcrete pressure is reduced to reduce engineering waste. The conversion of the above construction parameters is completed by the control system.

[0049] The controlled shotcrete pressure input range is 0-30MPa, and it changes within this range during construction. According to the statistics of field test data, the optimal shotcrete pressure is a linear function of the drilling speed, and the expression is as follows:

[0050] P=a*V 下 +b

[0051] Where P is the shotcrete pressure, V 下 is the drilling speed, which is obtained by real-time monitoring of the control system. a and b are control parameters. According to the statistics of field tests, the value of a is -0.25≤a≤-0.15, and the value of b is 25≤b≤30. The specific values ​​can be determined according to the site conditions during construction.

[0052] The controlled drilling speed input range is 0-150cm / min, and it changes within this range during construction. According to the statistics of field test data, the optimal drilling speed is a linear function of the drilling speed, and the expression is as follows:

[0053] V 上 =c*V 下 +d

[0054] Where V 上 is the drilling speed, V 下 is the drilling speed, which is obtained by real-time monitoring of the control system. c and d are control parameters. According to the statistics of field tests, the value of c is 0.8≤d≤1, and the value of d is 6≤d≤14. The specific values ​​can be selected according to the site conditions during construction.

[0055] After the construction of the mixing pile is completed, the slurry delivery pipe is switched to clean water to flush the grouting holes.

[0056] This embodiment realizes the construction of mixing piles based on different soils by jointly controlling the drilling and lifting processes, and determining the control parameters of the lifting process according to the drilling parameters; the slurry pressure and speed-up parameters at various depths during the construction of cement-soil mixing piles are controlled by the control system. The construction parameters of special-shaped piles are precisely determined, which greatly improves the quality of pile formation and ensures the foundation reinforcement effect.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. The construction control system of cement soil mixing pile based on soil adaptation is characterized by: include: Depth sensor and speed sensor installed on the drill rod of cement soil mixing pile construction drilling rig; Install the shotcrete pressure sensor at the cement slurry pump; and a control system, wherein the control system includes a drilling rig control module and a cement slurry pump control module; The drilling rig control module is connected to the depth sensor and the speed sensor; the cement slurry pump control module is connected to the pressure sensor. During the drilling process of the mixing drill rod, the drilling rig control module controls the drill rod to maintain constant power and records the drilling speed in real time, stores the drilling speed and drilling depth, and establishes a corresponding relationship between the depth and speed. When lifting, the drilling rig control module controls the lifting speed based on the drilling speed and depth, and the cement slurry pump control module controls the shotcrete pressure based on the drilling speed. If the soil in the corresponding depth section is hard and the drilling speed is slow, the lifting speed will slow down and the shotcrete pressure will increase. On the contrary, if the soil in the corresponding depth section is soft and the drilling speed is fast, the lifting speed will speed up and the shotcrete pressure will decrease.

2. The soil-adaptive cement-soil mixing pile construction control system according to claim 1, characterized in that: The control system is installed in a protective shell, and heat dissipation holes are arranged on the protective shell.

3. The soil-adaptive cement-soil mixing pile construction control system according to claim 1, characterized in that: A display screen is arranged on the protective shell.

4. The soil-adaptive cement-soil mixing pile construction control system according to claim 1, characterized in that: A manual control knob and an automatic control knob are arranged on the protective shell.

5. The soil-adaptive cement-soil mixing pile construction control system according to claim 1, characterized in that: The control system further comprises a slurry delivery path switching control module, and the slurry delivery path switching control module realizes the switching between slurry and clean water.

6. The control method of the soil-adaptive cement-soil mixing pile construction control system according to any one of claims 1 to 5, characterized in that: as follows: The drilling rig control module controls the drilling rig to start and drill. During the drilling process, the depth sensor and the speed sensor collect the drilling depth and the drilling speed in real time. The drilling rig control module stores the collected data and establishes a corresponding relationship between the depth and the speed. When the drilling rig reaches the set depth, the drilling rig is lifted up. During the lifting process, both the drilling rig control module and the cement slurry pump control module are turned on, and the drilling rig control module controls the lifting speed based on the drilling speed and the drilling depth, and the cement slurry pump control module controls the shotcrete pressure based on the drilling speed and the drilling depth. If the soil in the corresponding depth section is hard and the drilling speed is slow, the lifting speed will slow down and the shotcrete pressure will increase. On the contrary, if the soil in the corresponding depth section is soft and the drilling speed is fast, the lifting speed will speed up and the shotcrete pressure will decrease.

7. The control method of the soil-adaptive cement-soil mixing pile construction control system according to claim 6, characterized in that: The shotcrete pressure input range is 0-30MPa, and it changes within this range during construction. According to the statistics of field test data, the optimal shotcrete pressure is a linear function of the drilling speed, and the expression is as follows: P=a*V 下 +b Where: P is the shotcrete pressure, V is the shotcrete pressure, 下 is the drilling speed; a and b are control parameters. According to field test statistics, the value of a is -0.25≤a≤-0.15, and the value of b is 25≤b≤30.

8. The control method of the soil-adaptive cement-soil mixing pile construction control system according to claim 6 is characterized in that: The input range of the drill lifting speed is 0-150cm / min, and it changes within this range during construction. According to the statistics of field test data, the optimal drill lifting speed is a linear function of the drill lowering speed, and the expression is as follows: In 上 =c*V 下 +d Where V 上 is the drilling speed, V 下 is the drilling speed, c and d are control parameters; according to field test statistics, the value of c is 0.8≤d≤1, and the value of d is 6≤d≤14.

9. The control method of the soil-adaptive cement-soil mixing pile construction control system according to claim 6, characterized in that: After the construction of the mixing pile is completed, the slurry delivery pipe is switched to clean water to flush the grouting holes.

10. The control method of the soil-adaptive cement-soil mixing pile construction control system according to claim 9, characterized in that: The switching of the slurry delivery pipes is achieved by the slurry delivery path switching control module.

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