CN114370073A - Monitoring control system and method for stiffening core composite pile - Google Patents
Monitoring control system and method for stiffening core composite pile Download PDFInfo
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Abstract
The invention provides a monitoring control system and a monitoring control method for a stiffening core composite pile, which relate to the technical field of pile foundation mechanical equipment control, and the system comprises a data input screen display module, a central control platform, a mixing pile machine operation module, a slurry preparation and supply operation module, a holding and pressing pile machine operation module, a construction data acquisition module, a control module, a feedback control module and a data storage and evaluation module; the data input screen display module is used for transmitting preset execution parameter information to the central control platform, and the central control platform controls the mixing pile machine operation module, the pulping and slurry supplying operation module and the pile embracing and pressing machine operation module through the control module according to the preset execution parameter information. The system can solve the construction quality and safety problems of the mixing pile and the stiffening core composite pile, ensure the controllable reliability of the construction quality of the mixing pile, improve the bearing capacity of the stiffening core composite pile after the PHC pipe pile is inserted into the core and reduce the settlement of the stiffening core composite pile.
Description
Technical Field
The invention relates to the technical field of pile foundation mechanical equipment control, in particular to a system and a method for monitoring and controlling a stiffening core composite pile.
Background
After the technology of the stiff-core composite pile (also called stiff composite pile) based on the unidirectional rotation mixing pile technology is introduced into China from Japan, the technology is applied to the field of civil and architectural engineering at the beginning of the century. The stiff-core composite pile can solve the technical problems that the PHC pipe pile has a construction soil squeezing effect and cannot be driven into dense sandy soil, hard plastic cohesive soil and weathered rock-soil layers.
The engineering application results of the stiffened-core composite pile for many years show that the quality of the engineering quality of the stiffened-core composite pile depends on whether the engineering quality of construction of a deep mixing pile can be controlled or not and whether the PHC pipe pile can be controlled to be vertically inserted into the center of the mixing pile or not. At present, in the construction of deep mixing piles in China, a single-shaft rotary mixing drilling machine is adopted to input curing materials such as cement into the ground, and the curing materials are mixed with soil bodies through stirring, so that a series of physical and chemical reactions are generated between the curing agents and the soil bodies, a pile body with high strength and good water stability is generated, and a foundation pile body of the curing soil is provided for a stiff-core composite pile. In addition, because the drilling and digging penetrating capability of the mixing pile during construction is stronger than that of the PHC pipe pile during construction, the soil squeezing effect is smaller, the interference to the surrounding environment is less, and the hard core composite pile can solve the difficult problem of the soil squeezing effect of the PHC pipe pile and the technical problem that the PHC pipe pile cannot be driven into a compact sandy soil layer and a hard plastic sticky soil layer.
In the engineering construction of the stiffening core composite pile, the construction quality of the stirring pile can not be effectively controlled usually by using the unidirectional rotation stirring construction equipment and construction process which are depended on by the existing deep stirring pile engineering technology, the problems of uneven stirring and uneven strength distribution of the solidified soil pile body, easy occurrence of drilling sticking and holding during construction in a cohesive soil body, serious engineering quality problems that the strength of the solidified soil pile body cannot meet the design requirement, and the engineering safety problems that the bearing capacity of the stiffening core composite pile foundation is reduced and the settlement exceeds the standard can be caused. However, the existing control of the working quality needs to be realized by a pile driver operator, thereby introducing artificial influence factors.
The construction of the existing mixing pile and PHC tubular pile is realized by manually operating a pile driver by a manipulator; because the pile machine is not provided with intelligent monitoring and control equipment, a manipulator cannot sense stratum change conditions in drilling and digging stirring construction, cannot accurately control the lifting speed and the rotating speed of a drilling tool, cannot accurately control the slurry spraying amount of the stirring pile at each depth position, and cannot quantitatively implement manual operation and control actions of all the pile machines, which is the root cause of a large number of construction quality accidents and safety accidents caused by the stirring pile and the stiff core composite pile.
Disclosure of Invention
The invention solves the problems of how to solve the construction quality and safety problems of the mixing pile and the stiffening core composite pile, ensure the controllable reliability of the construction quality of the mixing pile, and solve the problems of the accurate position and the verticality of the core insert of the PHC pipe pile and the bearing capacity and the settlement of the stiffening core composite pile.
In order to solve the problems, the invention provides a monitoring control system of a stiffening core composite pile, which comprises a data input screen display module, a central control platform, a mixing pile machine operation module, a pulping and slurry supplying operation module, a holding and pressing pile machine operation module, a construction data acquisition module, a control module, a feedback control module and a data storage and evaluation module, wherein the data input screen display module is used for displaying the data of the stiffening core composite pile;
the data input screen display module is used for transmitting preset execution parameter information to the central control platform, and the central control platform controls the mixing pile machine operation module, the slurry making and supplying operation module and the pile embracing and pressing machine operation module through the control module according to the preset execution parameter information;
the construction data acquisition module is used for acquiring pile position positioning data information, mast inclination angle data information, drilling tool torque data information, drilling tool feeding force data information, drilling tool rotating speed data information, drilling tool depth data information, slurry supply pipeline flow data information, slurry supply pipeline pressure data information and pile body underground pressure data information;
the construction data acquisition module feeds acquired data information back to the central control platform, and the central control platform performs compensation control on the operation of the mixing pile machine operation module, the pulping and slurry supplying operation module and the holding and pressing pile machine operation module through the feedback control module according to a preset comparison flow, and obtains compensation control data information;
the data storage and evaluation module is used for receiving the preset execution parameter information, the data information acquired by the construction data acquisition module and the compensation control data information which are uploaded to the background server through the wireless communication module, and the data storage and evaluation module is used for evaluating the construction quality of the stiff core composite pile.
In the system, preset execution parameter information is input into a central control platform through a data input screen display module, construction parameter information is monitored and acquired in real time through a construction data acquisition module during construction, and control and compensation control over the operation action of each pile machine are realized through a control module and a feedback control module, so that a construction target result is realized. The method comprises the steps of obtaining and calculating various real-time construction parameters, wherein the parameters comprise pile position determination, main mast perpendicularity, pile body cement mixing amount, cement paste water-cement ratio, drilling tool torque, vertical drilling pressure, drilling speed, lifting speed, drilling tool rotating speed, drilling depth, cement spraying amount of each half extension meter along the pile body depth and other important construction parameters, and the control contents comprise control on a mixing pile machine operation module, a pulping and slurry supplying operation module and a holding and pressing pile machine operation module, so that the construction quality of a mixing pile and a stiff core composite pile is ensured, and the bearing capacity and settlement problem of the stiff core composite pile after the PHC pipe pile is positioned and vertically inserted is solved.
In the system, the operation module of the mixing pile machine controls the rotation function and the feeding function of the pile machine, and realizes the control of the construction parameters of the torque of the drilling tool, the vertical drilling pressure, the drilling speed, the hoisting speed and the rotating speed of the drilling tool. The pulping and slurry supplying operation module controls the water-cement ratio, the weight of various materials and water, the stirring time, the slurry supplying amount and the slurry supplying pressure, realizes the proportion of curing agent materials and water, determines the flow rate and the pressure of fluid in a conveying pipeline by using a flowmeter and a pressure gauge, and ensures that the current slurry supplying construction parameters are matched with the design requirements. The operation module of the pile embracing and pressing machine controls the central embracing, the embracing and pressing depth and the verticality of the PHC pipe pile of the pile embracing and pressing machine, and realizes the construction parameter control of pile core positioning, pile verticality, pile pressing force, embracing and pressing speed and the embracing and pressing depth.
In the system, a construction data acquisition module acquires construction process information of nine sensors of the mixing pile in real time; the nine sensors are respectively a pile position Beidou positioning sensor, a mast inclination angle sensor, a drilling tool torque sensor, a drilling tool feeding force/lifting force sensor, a drilling tool rotating speed sensor, a drilling tool (encoder) depth sensor, a slurry supply pipeline flow sensor, a slurry supply pipeline pressure sensor and a pile body pressure sensor. Acquiring the construction process information of four sensors of the PHC tubular pile in real time; wherein, four sensors are respectively a pile position Beidou positioning sensor, a PHC tubular pile inclination angle sensor, a pile pressing force sensor and a PHC tubular pile (encoder) pressing depth sensor. All the collected information is transmitted to the central control platform in a wired and wireless mode, and the construction information is used as the basis for the central control platform to issue instructions, execution control and feedback control actions to each operation subsystem, so that the stiff core composite pile construction is ensured to achieve all the targets of the design requirements.
In the system, a data storage and evaluation module stores construction data of the pile machine into various data files of an engineering project according to time lines, and performs quality evaluation on each constructed stiff core composite pile by comparing the designed target requirements with the actual construction effect; all the storage files of the pile driver data can be retrieved and used at any time.
Further, the preset execution parameter information comprises pile position horizontal and vertical coordinates, a water cement ratio, a curing agent mixing amount, a drilling and digging stirring speed, a drilling tool lifting speed, upper and lower power head rotating speeds, a stirring pile construction depth and a holding and pressing depth of the PHC tubular pile.
Further, the preset control instruction and the corresponding compensation control corresponding to the operation module of the mixing pile machine respectively include:
a first control unit: the horizontal and vertical coordinates of the pile position are transmitted to the operation module of the mixing pile machine through the central control platform, and the deviation of the pile position is controlled and adjusted according to the pile position positioning data information; adjusting the verticality of the mast of the pile machine according to the mast inclination angle data information; the central control platform controls the operation module of the mixing pile machine according to the drilling and digging mixing speed, the drilling tool lifting speed and the mixing pile construction depth of a drilling tool;
a downlink stage working unit: the operation module is used for transmitting the rotating speed and the rotating direction of the upper power head and the lower power head to the mixing pile machine; the mixing pile machine operation module controls a pile machine according to the preset execution parameter information, applies torques in opposite directions to an upper power head and a lower power head, performs drilling and mixing operation of the pile machine in a downlink stage, and completes construction of the downlink drilling and mixing operation stage by implementing quantitative injection of a curing agent at an injection port until the depth data information of the drilling tool is monitored to reach the preset construction depth of the mixing pile;
an underground pressure feedback control unit: the ground pressure monitoring module is used for monitoring ground pressure according to the data information of the underground pressure of the pile body, and controlling the drilling and digging stirring speed and the grouting amount of a grouting pump through the feedback control module when the ground pressure is too large;
a slurry injection amount control unit: the system is used for adjusting the frequency of a grouting pump through the feedback control module according to the drilling tool torque data information and the pile body underground pressure data information so as to control the slurry injection amount of a curing agent;
an uplink stage working unit: and the pile driving module is used for controlling the pile driver according to the preset execution parameter information, applying clockwise and anticlockwise torques and pulling force to the upper power head and the lower power head, performing secondary stirring operation on the stirring pile in an uplink stage of the pile driver until monitoring the preset construction elevation of the drilling tool depth data information reaching the stirring pile, and completing the construction in the uplink stirring operation stage.
In the system, when the ground pressure is too large, namely the existing ground pressure exceeds the original ground pressure by 20 percent. Wherein, control module and feedback control module are based on PID control algorithm to according to stirring stake machine operation module, slurrying confession thick liquid operation module, embrace the preset action of stake machine operation module and control each real-time construction action, digital control algorithm's engineering realizes mainly embodying in 5 aspects: namely selection of a given value, processing of a controlled quantity, deviation processing, control algorithm and control quantity processing.
In the system, the given value comprises preset execution parameter information and a change rate limit of the set parameter value; the upper limit and the lower limit of the controlled quantity are required to be subjected to alarm processing in order to ensure the safe operation of the construction equipment; the deviation processing comprises deviation calculation, deviation alarm and input compensation; the control algorithm is realized by performing control calculation in an automatic state and determining the upper limit amplitude and the lower limit amplitude of the calculated control quantity; the control amount processing requires judgment and processing of the output amount, and puts forward a limit on the change rate of the control amount and an output holding requirement on the basis of clarifying the relationship between the control amount and the output compensation amount. Taking a variable-frequency grouting pump control as an example for explanation, the key technology of controlling the injection quality of the mixing pile is to control the injection quantity of a set solidified material of each half of an extended meter of the mixing pile, under the condition of a known drilling tool drilling and stirring speed, the injection quantity of the solidified material at each 2-second time interval can be calculated, if the injection quantity is a preset value, when the injection quantity of the solidified material which is given by a construction data acquisition module and is collected in real time at each 2-second time interval is greater than or less than the preset value, a data calculation module gives a compensation quantity value of the solidified material through calculation, and controls the variable-frequency grouting pump to realize the injection quantity adjustment of the solidified material at the next 2 seconds, so that the dynamic injection quantity of the mixing pile approaches to an initial design value under the condition of small fluctuation.
Further, the preset control instruction and the corresponding compensation control corresponding to the pulping pulp supply operation module respectively comprise:
a slurry injection amount calculation unit: the slurry supply operation module is used for determining the consumption of the curing material of each half linear meter of pile length and the converted slurry injection amount according to the water-cement ratio and the mixing amount of the curing agent, so as to obtain the slurry injection amount at each second time interval;
a pulp supply unit: and the system is used for supplying the grout to the mixing pile machine through the grout making and supplying operation module according to the flow data information of the grout supplying pipeline and the pressure data information of the grout supplying pipeline at the time interval of each second.
Further, the preset control instruction and the corresponding compensation control corresponding to the pile embracing and pressing machine operation module respectively include:
a second control unit: the horizontal and vertical coordinates of the pile position are transmitted to the pile embracing and pressing machine operation module through the central control platform, and the deviation of the pile position is controlled and adjusted according to the pile position positioning data information, so that the center of the PHC tubular pile is superposed with the center of the mixing pile; adjusting the perpendicularity of the PHC tubular pile through the inclination angle data information of the PHC tubular pile;
pile planting unit: the pile planting device is used for tightly holding and pressing the PHC pipe pile to realize pile planting until the construction data acquisition module detects that the PHC pipe pile reaches the preset holding and pressing depth, and pile planting construction of the stiffened core composite pile is completed.
A monitoring control method for a stiffened-core composite pile comprises the following steps:
s1: transmitting preset execution parameter information to a central control platform, and controlling a mixing pile machine operation module, a slurry making and supplying operation module and a pile embracing and pressing machine operation module by the central control platform through a control module according to the preset execution parameter information;
s2: pile position positioning data information, mast inclination angle data information, drilling tool torque data information, drilling tool feeding force data information, drilling tool rotating speed data information, drilling tool depth data information, slurry supply pipeline flow data information, slurry supply pipeline pressure data information and pile body underground pressure data information are acquired through a construction data acquisition module;
s3: feeding back data information acquired by the construction data acquisition module to the central control platform, and performing compensation control on the operation of the mixing pile machine operation module, the pulping and slurry supplying operation module and the holding and pressing pile machine operation module by the central control platform through a feedback control module according to a preset comparison flow to obtain compensation control data information;
s4: and uploading the preset execution parameter information, the data information acquired by the construction data acquisition module and the compensation control data information to a background server through a wireless communication module, transmitting the received information to a data storage and evaluation module by the background server, and evaluating the construction quality of the stiffness core composite pile through the data storage and evaluation module.
Further, the preset execution parameter information in step S1 includes pile position horizontal and vertical coordinates, water cement ratio, curing agent mixing amount, drilling and stirring speed, drilling tool lifting speed, upper and lower power head rotating speed, mixing pile construction depth, and holding pressure depth of the PHC tubular pile.
Further, the preset control instruction and the corresponding compensation control corresponding to the operation module of the mixing pile machine respectively comprise the following steps:
s31: the horizontal and vertical coordinates of the pile position are transmitted to the operation module of the mixing pile machine through the central control platform, and the deviation of the pile position is controlled and adjusted according to the pile position positioning data information; adjusting the verticality of the mast according to the mast inclination angle data information; the central control platform controls the operation module of the mixing pile machine according to the drilling and digging mixing speed, the drilling tool lifting speed and the mixing pile construction depth of a drilling tool;
s32: transmitting the rotating speed and the rotating direction of the upper power head and the lower power head to the operation module of the mixing pile machine; the mixing pile machine operation module controls a pile machine according to the preset execution parameter information, applies torques in opposite directions to an upper power head and a lower power head, performs drilling and mixing operation of the pile machine in a downlink stage, and completes construction of the downlink drilling and mixing operation stage by implementing quantitative injection of a curing agent at an injection port until the depth data information of the drilling tool is monitored to reach the preset construction depth of the mixing pile;
s33: monitoring ground pressure according to the data information of the underground pressure of the pile body, and controlling the drilling and digging stirring speed and the grouting amount of a grouting pump through the feedback control module when the ground pressure is too high; adjusting the frequency of a grouting pump through the feedback control module according to the drilling tool torque data information so as to control the slurry injection amount of a curing agent;
s34: according to preset execution parameter information passes through stirring stake machine operation module control stake machine to apply clockwise and anticlockwise moment of torsion and carry out the stirring stake secondary stirring operation of stake machine ascending stage to upper and lower unit head, until monitoring drilling tool degree of depth data information reaches the preset construction elevation of stirring stake, accomplish the construction of ascending stirring operation stage.
Further, the preset control instruction corresponding to the pulping pulp supply operation module and the corresponding compensation control respectively comprise the following steps:
s35: determining the consumption of the curing material of each half linear meter of pile length and the converted slurry injection amount through the slurry preparation and supply operation module according to the water-cement ratio and the mixing amount of the curing agent to obtain the slurry injection amount at each second time interval;
s36: and supplying the slurry to the mixing pile machine according to the flow data information of the slurry supply pipeline and the pressure data information of the slurry supply pipeline by the slurry preparing and supplying operation module at the time interval of each second.
Further, the preset control instruction and the corresponding compensation control corresponding to the pile embracing and pressing machine operation module respectively comprise the following steps:
s37: the horizontal and vertical coordinates of the pile position are transmitted to the pile embracing and pressing machine operation module through the central control platform, and the deviation of the pile position is controlled and adjusted according to the pile position positioning data information, so that the center of the PHC tubular pile is superposed with the center of the mixing pile; adjusting the perpendicularity of the PHC tubular pile through the inclination angle data information of the PHC tubular pile;
s38: and (4) clasping and clasping the PHC tubular pile to realize pile planting until the construction data acquisition module detects that the PHC tubular pile reaches the preset clasping depth, and the pile planting construction of the stiffened-core composite pile is completed.
The invention adopts the technical scheme at least comprising the following beneficial effects:
the monitoring control system can acquire the output torque of the power head in real time in the construction process and continuously judge the soft and hard properties of the underground soil layer, so that the drilling and digging stirring actions of the construction drilling tool can be reasonably controlled, and the problem that the conventional drilling tool cannot overcome the difficulty of implementing a large-diameter and large-depth stirring pile in a completely weathered, strongly weathered and compact sandy soil or hard plastic clay layer is solved by using a short spiral drill bit; in the construction process, the monitoring control system can adjust the drilling and digging stirring speed of the drilling tool according to the soft and hard properties of the soil layer, variable speed construction is realized through the information acquisition module and the feedback control module, the variable rigidity stirring pile is optimally formed, and the purposes of saving working hours and solidifying materials are achieved. The mixing amount of the pile body cement, the water cement ratio of cement paste, the drilling speed during construction, the lifting speed, the rotating speed of a drilling tool and the spraying amount of each half of an extension meter along the depth of the pile body are determined according to the properties of a foundation soil layer, and constant preset parameters can be kept in the construction process so as to meet the mixing uniformity and the design strength of the mixing pile.
Drawings
Fig. 1 is a structural diagram of a monitoring and control system of a stiffened core composite pile according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a combined pile driver of a monitoring and control system for a stiffened core composite pile according to an embodiment of the present invention;
fig. 3 is a flowchart of a first monitoring and controlling method for a stiffened core composite pile according to a second embodiment of the present invention;
fig. 4 is a flowchart of a second monitoring and controlling method for a stiffened core composite pile according to a second embodiment of the present invention;
description of reference numerals:
1-combined pile machine, 101-hydraulic support leg, 102-mast of mixing pile machine, 103-power head of mixing pile machine, 104-precast pile, 105-slurry making and supplying background and 106-slurry conveying pipeline.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
Example one
The embodiment provides a monitoring control system for a stiffening core composite pile, which comprises a data input screen display module, a central control platform, a mixing pile machine operation module, a slurry preparation and supply operation module, a holding and pressing pile machine operation module, a construction data acquisition module, a control module, a feedback control module and a data storage and evaluation module, wherein the data input screen display module, the central control platform, the mixing pile machine operation module, the slurry preparation and supply operation module, the holding and pressing pile machine operation module, the construction data acquisition module, the control module, the feedback control module and the data storage and evaluation module are arranged in the system;
the data input screen display module is used for transmitting preset execution parameter information to the central control platform, and the central control platform controls the mixing pile machine operation module, the slurry making and supplying operation module and the pile embracing and pressing machine operation module through the control module according to the preset execution parameter information;
the construction data acquisition module is used for acquiring pile position positioning data information, mast inclination angle data information, drilling tool torque data information, drilling tool feeding force data information, drilling tool rotating speed data information, drilling tool depth data information, slurry supply pipeline flow data information, slurry supply pipeline pressure data information and pile body underground pressure data information;
the construction data acquisition module feeds acquired data information back to the central control platform, and the central control platform performs compensation control on the operation of the mixing pile machine operation module, the pulping and slurry supplying operation module and the pile embracing machine operation module through the feedback control module according to a preset comparison process, and obtains compensation control data information;
the data storage and evaluation module is used for receiving the preset execution parameter information, the data information and the compensation control data information which are uploaded to the background server through the wireless communication module and collected by the construction data collection module, and the data storage and evaluation module is used for evaluating the construction quality of the stiffness core composite pile.
Specifically, the construction data acquisition module acquires construction process information of nine sensors of the stiffened core composite pile in real time; the nine sensors are respectively a pile position Beidou positioning sensor, a mast inclination angle sensor, a drilling tool torque sensor, a drilling tool feeding force/lifting force sensor, a drilling tool rotating speed sensor, a drilling tool (encoder) depth sensor, a slurry supply pipeline flow sensor, a slurry supply pipeline pressure sensor and a pile body pressure sensor.
Specifically, in the construction process of the stiffened-core composite pile, various sensors placed in the pile machine, the slurry preparing and supplying background and the slurry supplying channel can transmit data acquired in real time to the central control platform, and the central control platform can be communicated with the gateway and the Internet of things platform through the wireless communication module; in addition, the construction data are stored in a data storage evaluation module and can be called at any time, the data storage evaluation module can evaluate the construction quality of the stiffened core composite pile according to the slurry injection amount of each half linear meter, and when the error between the designed slurry injection amount and the actual injection amount of each half linear meter is less than or equal to 5%, the construction quality of the pile is excellent; when the error is 6-10%, the construction quality of the pile is good; when the error is 10-15%, the construction quality of the pile is qualified; and if the error is more than 15%, determining that the construction quality of the pile is unqualified.
The preset execution parameter information comprises pile position horizontal and vertical coordinates, a water cement ratio, a curing agent mixing amount, a drilling and stirring speed, a drilling tool lifting speed, upper and lower power head rotating speeds, a stirring pile construction depth and a holding and pressing depth of the PHC tubular pile;
wherein, the holding and pressing depth of the PHC tubular pile is preferably selected to be 20m, 30m, 40m, 50m or 60m according to the designed pile length.
Specifically, the preset execution parameter information for the stiff core composite pile construction can be manually input through the data input screen display module or enter the data input screen display module through the background server to be input in a cloud side.
Wherein, the preset control instruction that stirring stake machine operation module corresponds and the compensation control that corresponds include respectively:
a first control unit: the horizontal and vertical coordinates of the pile position are transmitted to a running module of the mixing pile machine through a central control platform, and the deviation of the pile position is controlled and adjusted according to the positioning data information of the pile position; adjusting the verticality of the mast of the pile machine through mast inclination angle data information; the central control platform controls the operation module of the mixing pile machine according to the drilling and digging mixing speed of the drilling tool, the lifting speed of the drilling tool and the construction depth of the mixing pile;
a downlink stage working unit: the device is used for transmitting the rotating speed and the rotating direction of the upper power head and the lower power head to the operation module of the mixing pile machine; the mixing pile machine operation module controls a pile machine according to preset execution parameter information, applies torques in opposite directions to an upper power head and a lower power head, performs drilling and mixing operation of a pile machine in a downlink stage, and completes construction of the downlink drilling and mixing operation stage by implementing quantitative injection of a curing agent at an injection port until the depth data information of a drilling tool is monitored to reach the preset construction depth of a mixing pile;
an underground pressure feedback control unit: the ground pressure monitoring device is used for monitoring ground pressure according to data information of the underground pressure of the pile body, and controlling the drilling and digging stirring speed and the grouting amount of a grouting pump through a feedback control module when the ground pressure is too large; wherein, when the monitored ground pressure exceeds 20 percent of the original ground pressure, the ground pressure is determined to be overlarge.
A slurry injection amount control unit: the system is used for adjusting the frequency of a grouting pump through a feedback control module according to the torque data information of the drilling tool and the underground pressure data information of the pile body so as to control the slurry injection amount of a curing agent;
an uplink stage working unit: the device is used for controlling the pile machine through the operation module of the mixing pile machine according to the preset execution parameter information, applying clockwise and anticlockwise torques and pulling forces to the upper power head and the lower power head, performing secondary mixing operation on the mixing pile in the uplink stage of the pile machine until the depth data information of the drilling tool is monitored to reach the preset construction elevation of the mixing pile, and completing construction in the uplink mixing operation stage.
Specifically, the operation module of the mixing pile machine further comprises a power swing mechanism, a pile machine feeding mechanism and an electric control hydraulic multi-way steering valve. The pulping and pulp supplying operation module also comprises a batching unit, a pulping unit and a pulp supplying unit. The central control platform transfers the pile position horizontal and vertical coordinates of the data input screen display module to the mixing pile machine operation module, the combined pile machine 1 is moved according to the set pile position horizontal and vertical coordinates, and the pile position deviation can be controlled within 2cm under the help of the pile position Beidou positioning sensor; by utilizing the mast inclination angle sensor to measure data, the hydraulic support leg 101 of the pile machine can adjust the mast of the pile machine to be vertical, and the inclination error is ensured not to exceed 1%.
Specifically, in the down-going operation stage of the pile machine, the pile machine and the feeding unit are started, the central control platform transfers preset construction parameters such as drilling and digging stirring speed of a drilling tool, lifting speed of the drilling tool, drilling depth and the like to a pile machine feeding mechanism of a pile mixing machine operation module, and transfers drilling speed parameters of an upper power head and a lower power head to a power swing mechanism of a pile mixing machine operation module; the operation module of the mixing pile machine controls the pile machine through an electric control hydraulic multi-way steering valve according to preset execution parameter information, applies torques in opposite directions to an upper power head and a lower power head, and performs drilling and mixing operations of a descending stage of the pile machine, and simultaneously implements quantitative injection of a solidified material through an injection port by using a high-pressure injection pump until detection data of a drilling tool depth sensor reaches a designed drilling depth, so that construction of the descending drilling and mixing operation stage is completed. In the construction process, the pile body ground pressure sensor is arranged at the bottom of the drill bit, so that real-time ground pressure measurement data can be provided, when the ground pressure is detected to be too large, the control module and the feedback control module are automatically involved, the drilling and excavating stirring speed and the injection amount of the grouting pump are reduced according to a set control algorithm program, and the injection amount of each half linear meter is ensured to meet the design requirement.
Specifically, in the drilling and excavating stirring process, the control module and the feedback control module can adjust the frequency of the grouting pump according to the real-time torque data and the underground pressure data information of the pile body, and then the frequency conversion grouting technology is used for guaranteeing the optimal grouting amount of the solidified material slurry.
Specifically, in the pile machine ascending operation stage, the mixing pile machine operation module continues to control the pile machine through the electric control hydraulic multi-way steering valve according to preset execution parameter information, clockwise and anticlockwise torques and extraction forces are applied to the upper power head and the lower power head, secondary mixing operation of the mixing pile in the pile machine ascending stage is carried out until the drilling tool depth sensor detects that the preset construction pile top elevation reaches, and construction in the ascending mixing operation stage is completed.
Specifically, the monitoring control system can acquire the output torque of the power head in real time in the construction process and continuously judge the hardness of the underground soil layer, so that the drilling and stirring actions of the combined construction drilling tool can be reasonably guided, and the difficult problem of implementing a large-diameter and large-depth stirring pile in a completely weathered, strongly weathered, compact sandy soil or hard plastic clay layer, which cannot be overcome by the traditional drilling tool, can be solved by utilizing the powerful self-tapping capability of the short spiral drilling head; in the construction process, the system can adjust the drilling speed of the drilling tool according to the hardness of the soil layer, and realizes optimized variable speed construction under the support of the construction data acquisition module, the control module and the feedback control module, thereby achieving the purposes of saving working hours and solidifying materials. When the combined construction drilling tool is used for implementing a speed-control reverse rotation lifting stirring technology, the instruction control of the system is required, and the lifting amount of the combined construction drilling tool rotating every circle is kept to be smaller than one screw pitch under the condition that the short spiral drill bit rotates anticlockwise; under the premise, the further compaction and reinforcement effect of the solidified soil can be realized through the helical blade back pressure technology, and the compactness and strength of the solidified soil are improved, so that the high construction quality, the short construction period, the material saving and the cost reduction of the stiffened core composite pile are ensured.
Wherein, the preset control instruction and the corresponding compensation control that the slurrying supplies thick liquid operation module to correspond respectively include:
a slurry injection amount calculation unit: the system is used for determining the consumption of the curing material of each half linear meter of pile length and the converted slurry injection amount through a slurry preparation and supply operation module according to the water-cement ratio and the mixing amount of the curing agent to obtain the slurry injection amount at each second time interval;
a pulp supply unit: the system is used for supplying the grout to the mixing pile machine through the grout supply operation module according to the flow data information of the grout supply pipeline and the pressure data information of the grout supply pipeline at the time interval of each second.
Specifically, the pulping and slurry supplying operation module is controlled to be started, the central control platform is used for transferring parameters such as water-cement ratio, curing agent mixing amount and the like to the pulping and slurry supplying operation module, the batching unit is used for automatically calculating and weighing the required amount of water and the curing agent according to the received construction parameters, and the data input screen display module can display the required amount of the curing material, the required amount of water and the required amount of an additive for the stirring pile; determining the consumption of the curing material of each half linear meter of the pile length and the converted slurry injection amount, and calculating the slurry injection amount at each second time interval; the pulping unit can stir and mix water, the curing material and the additive according to the set stirring time and the set rotating speed of the stirring blades; the slurry supply unit can supply slurry to the mixing pile machine according to the slurry supply amount and the slurry conveying pressure; and for the possible emergency, the mode of manual intervention can be adopted, and the stirring station is manually controlled to perform background pulping and pulp supply. In addition, the data input screen display module also provides background visual presentation of the mixing plant, and can present information such as the current slurry water-cement ratio, the set water-cement ratio, the slurry supply flow rate, the conveying pressure and the like in real time.
The preset control instruction and the corresponding compensation control corresponding to the pile embracing and pressing machine operation module respectively comprise:
a second control unit: the horizontal and vertical coordinates of the pile position are transmitted to a pile embracing and pressing machine operation module through a central control platform, and the deviation of the pile position is controlled and adjusted according to the pile position positioning data information, so that the center of the PHC tubular pile is superposed with the center of the mixing pile; adjusting the perpendicularity of the PHC tubular pile through the inclination angle data information of the PHC tubular pile;
pile planting unit: the pile planting device is used for tightly holding and pressing the PHC pipe pile to realize pile planting until the construction data acquisition module detects that the PHC pipe pile reaches the preset holding and pressing depth, and pile planting construction of the stiffened-core composite pile is completed.
Specifically, the pile embracing and pressing machine operation module further comprises a precast pile embracing mechanism, a precast pile embracing and pressing mechanism and an electric control hydraulic multi-way steering valve. The central control platform adjusts the horizontal and vertical coordinates of the pile position and transmits the horizontal and vertical coordinates to the operation module of the pile embracing and pressing machine, and a pile position Beidou positioning sensor of the pile embracing and pressing machine can ensure that the center of the PHC pipe pile is superposed with the center of the mixing pile, and the deviation is controlled within 2 cm; and the verticality of the PHC tubular pile is adjusted by correcting equipment according to the measurement data of the inclination angle sensor, so that the error is not more than 1%. And hoisting the precast pile 104 into a clamp, monitoring inclination angle data in real time according to an inclination angle sensor of the PHC tubular pile of the pile holding and pressing machine, and adjusting the verticality of the PHC tubular pile until the requirement of 1% is met. The PHC tubular pile construction mainly depends on a precast pile holding mechanism and a precast pile holding and pressing mechanism, pile planting is realized by holding and pressing the PHC tubular pile through an electric control hydraulic multi-way steering valve according to preset construction parameters by a pile holding and pressing machine operation module until a depth sensor detects that the designed holding and pressing depth reaches, and all construction work of the stiff core composite pile is completed.
One of the embodiments in this embodiment: a foundation pile stiffening core composite pile with an engineering background for constructing a small high-rise residential building is selected for explanation, the pile length of a mixing pile is 24m, the pile diameter is 1100mm, the distance between the pile top and the ground is 1m, the pile length of a PHC pipe pile is 24m, the pile diameter is 700mm, and the design ultimate bearing capacity of a single pile is 4600 kN.
Basic conditions in the present embodiment: the three layers of foundation soil of the field are respectively cohesive soil with the thickness of 12m, the water content is w equal to 36%, e equal to 1.35, and the SPT equal to 3-9; the fine soil is 9m thick, the water content is w is 27%, e is 1.1, and SPT is 7-18; the weathered soil layer is 19m thick, the water content is w equal to 25%, and the SPT equal to 13-29%; adopting a KD curing agent product, wherein the doping amount is 12 percent, the water-cement ratio is 0.5, and adopting a single-channel guniting method to spread the curing agent; the construction drilling machine adopts a 2x15tm hydraulic driven double-power-head combined pile machine, and a one-spraying and two-stirring construction process of a stirring pile and a PHC pipe pile holding and pressing construction process are applied to construction.
Before construction, firstly, a data input screen display module is utilized to input the coordinate position (X, Y) of the stiffening core composite pile to be constructed at this time, the soil layer property of each construction position, the mixing amount of a pile body curing agent, the water-cement ratio of the curing agent slurry 0.5, the tunneling speed of 0.6-1.2 m/min, the lifting speed of 1-1.5 m/min, the rotating speed of an outer drill rod of 15r/min, the rotating speed of an inner drill rod of 18r/min and the drilling and stirring depth of 25m, or the construction parameters of the project existing in the background server are directly called, the pulping and slurry supplying operation module in the central control platform automatically calculates according to the set parameters, the consumption of the curing agent required by the stiffened core composite pile constructed at this time is fed back to be about 5904kg, the consumption of water is 2952kg, the consumption of the curing agent per linear meter along the pile body is about 205kg/m, and the consumption of the curing agent per second can be obtained by combining the tunneling speed.
After the construction parameters are set, starting equipment is shifted, at the moment, the pile machine compares the coordinates (X ', Y') obtained by the pile position Beidou positioning sensor with the pile position coordinates (X, Y), the electric control hydraulic multi-way steering valve is used for controlling the pile machine to automatically move to the pile position to be constructed, the pile position deviation is ensured to be within 2cm, and the verticality of the mast 102 of the mixing pile machine is controlled through the telescopic oil cylinder by combining the mast inclination angle sensor, so that the verticality error is not more than 1%.
After the pile driver is in place, starting a background pulping and slurry supplying operation module, controlling the quality of a curing agent material and water through a weighing device in a proportioning unit, wherein the dosage of curing agent slurry with the water-to-adhesive ratio of 0.5 is about 8856kg, stirring the curing agent slurry under the control of the pulping unit, and starting a high-pressure grouting pump to execute slurry supplying action after the set stirring time is reached; the operation flow of pulping and pulp supplying can be observed on a data input screen display module at the background of the mixing station, and if major problems occur during the preparation and pulp supplying of the pulp, the system can automatically alarm, intervene in manual intervention or halt for self-checking.
After the slurry supply begins, the central control platform immediately sends out an instruction to start drilling and stirring construction, and under the condition that the inner pipe and the short spiral drill bit of the combined pile machine 1 keep rotating clockwise and the outer pipe keeps rotating anticlockwise, the drilling machine respectively applies forward and reverse torques to the power head 103 of the stirring pile machine according to set construction parameters, wherein the short spiral drill bit carries out powerful drilling operation at the bottommost end of the drilling tool by utilizing the self-tapping characteristic.
In the descending stage of the drilling machine, the excavation resistance can be changed due to different properties of construction strata, and the excavation speed and the rotating speed of the drilling tool can be changed; and at the moment, the drilling tool feeding force sensor and the drilling tool drilling speed sensor can feed back real-time construction data to the central control platform, if the rotating speed of the drilling tool is less than 15r/min, the drilling speed is less than 1m/min, and the drilling resistance is increased, at the moment, the central control platform can automatically lift the torque and the feeding force according to the preset construction requirements to maintain the required rotating speed and drilling speed of the drilling tool, namely, the construction of a downlink stage is controlled according to the construction parameters input in advance.
In the construction process, under the superposition of different influence factors, the injection amount of the curing material slurry in unit time can generate fluctuation changes in different degrees, so that the doping amount of the curing material is not uniform, and the injection amount per linear meter along the depth of the pile body changes, thereby causing that the bearing capacity of the mixing pile possibly cannot meet the design requirement. At the moment, the central control platform calculates the command data control algorithm according to real-time data provided by a drilling tool (encoder) depth sensor, a slurry supply pipeline flow sensor and a slurry supply pipeline pressure sensor, the command data control algorithm is based on the use amount of a curing agent per linear meter of 205kg/m, and when the use amount of the curing agent is smaller than or larger than 3.42kg/s, the control module and the feedback control module automatically intervene and adjust the slurry spraying amount by increasing and decreasing the drilling speed and a grouting pump frequency conversion controller, namely, the use amount of the curing agent of the mixing pile is maintained at about 3.42kg/s through frequency conversion slurry spraying so as to meet the design requirements. In the guniting process, when the deviation value of the guniting quantity exceeds an alarm value, such as 8%, the central control platform can automatically alarm to prompt an operator to perform manual intervention and search the reason for the problem.
In the ascending stage of the drilling machine, under the condition that the inner pipe and the short spiral drill bit of the combined pile machine 1 keep anticlockwise rotation and the outer pipe keeps clockwise rotation, and the lifting amount of the combined drilling tool per rotation circle of the short spiral drill bit is 0.5(75mm) screw pitches, the pile machine applies forward and reverse torque and lifting force to the power head 103 of the mixing pile machine according to the set lifting speed and the set rotation speed, and carries out compaction and reinforcement operation on the mixing pile body in the ascending stage by utilizing a reverse extrusion technology. During the construction period, the command data control algorithm of the central control platform calculates according to real-time data collected by the drilling tool rotating speed sensor, the drilling tool lifting force sensor and the drilling tool depth sensor, judges whether the requirement that the lifting amount of the construction drilling tool is 0.5(75mm) pitch per rotation circle of the short spiral drill bit is met, and if the requirement is not met, the lifting speed and the rotating speed of the drilling tool are adjusted to enable the construction design parameter requirement to be met until the ascending operation reaches the preset pile top construction elevation and the construction operation of the mixing pile is completed.
After the mixing pile machine is shifted, starting the holding pile machine, and ensuring that the core of the PHC pipe pile is superposed with the core of the mixing pile by using a Beidou positioning sensor, wherein the deviation is within 2 cm; the concrete operation is that the electric control hydraulic multi-way steering valve is used for controlling the holding and pressing pile machine to automatically move to a construction pile position, the PHC tubular pile is lifted and placed into the clamp, and the holding and pressing pile machine controls the verticality of the PHC tubular pile to meet the requirement of 1% according to the real-time data of the inclination angle sensor. And in the process of sinking the PHC tubular pile, the depth sensor collects pile sinking depth data in real time and displays the pile sinking depth data in a data input screen display module of the central control platform, and when the elevation of the pile end of the PHC tubular pile reaches the designed elevation, the system automatically stops pile pressing and finishes the construction of the stiffened core composite pile.
After the construction process is finished, the data storage and evaluation module can collect and store the data collected in the whole construction, and the data storage and evaluation module can evaluate the construction quality of each stiffening core composite pile by comparing with a design target, and the information data of any stiffening core composite pile in the engineering can be retrieved after the engineering construction is finished.
In the embodiment, another embodiment is as follows: a foundation pile stiffness core composite pile with an engineering background for constructing a high-rise residential building is selected for explanation, the length of a mixing pile is 30m, the diameter of the mixing pile is 1200mm, the length of a PHC pipe pile is 30m, the diameter of the PHC pipe pile is 800mm, and the design limit bearing capacity of a single pile is 5800 kN.
Basic conditions in the present embodiment: three layers of foundation soil of the field are respectively cohesive soil, the thickness of the soil is 14m, the water content is w is 38%, e is 1.3, and SPT is 3-8; the thickness of the silt is 13m, the water content is 29% w, 1.0 e and 7-20 SPT; fine sandy soil with the thickness of 9m, the water content w of 35 percent and the SPT of 14 to 27 percent; adopting KD curing agent product with the doping amount of 13 percent and the water-to-glue ratio of 0.7, and adopting a double-channel slurry injection method to spread curing agent slurry; the construction drilling machine adopts a 2x20tm hydraulic drive double-power-head drilling machine and an external double-frame bidirectional stirring drilling tool, and a one-spraying and two-stirring construction process of a stirring pile and a holding and pressing construction process of a PHC pipe pile are applied to construction.
The setting of the preset execution parameter information of the stiffening core composite pile can be manually input through a data input screen display module of the system or input through a cloud end of an Internet of things platform. The set basic data comprises but is not limited to pile position coordinates (X, Y), a water-adhesive ratio of 0.7, a curing agent mixing amount of 13%, a downward speed of 0.6-1.0 m/min, an upward speed of 1-1.5 m/min, an upper power head rotating speed of 10-15 r/min, a lower power head rotating speed of 10-15 r/min, a mixing pile construction depth of 30m and a PHC pipe pile holding pressure depth of 30 m.
In the pulping and slurry supplying process, starting a pulping and slurry supplying operation module, transferring parameters of 0.7 of water-to-glue ratio and 13% of mixing amount of a curing agent to the pulping and slurry supplying operation module by a central control platform, automatically calculating and weighing required amounts of water and the curing agent by a batching unit of the pulping and slurry supplying operation module according to the transferred parameters, and displaying that the consumption of the curing agent required by the pile is 9522kg, the consumption of water is 6665kg, the consumption of the curing agent per linear meter is 450kg/m, and the spraying of the curing agent per second is 7.5 kg/s; the pulping unit of the pulping and pulp supplying operation module can stir and mix water and a curing agent according to the set stirring time and the rotating speed of the stirring blade; the slurry supply unit of the slurry preparation and supply operation module can supply slurry to the front stirring pile machine according to the slurry supply flow and the slurry supply pressure; in order to deal with the possible sudden situation, the stirring background pulping and pulp supply can be controlled manually; in addition, the data input screen display module also provides local data visual presentation, and can present information such as the current slurry water-cement ratio, the set water-cement ratio, the slurry supply flow rate, the pressure and the like in real time.
Before the mixing pile is driven, the central control platform transfers pile position coordinate data (X, Y) to a mixing pile machine operation module, the combined pile machine 1 is moved according to the set pile position coordinate, a Beidou positioning sensor is arranged on the pile machine and used in cooperation with satellite positioning, pile position deviation can be controlled within 2cm, perpendicularity of a mixing pile machine mast 102 is adjusted through a pile machine hydraulic support leg 101 in combination with a mast inclination angle sensor, and an error is guaranteed to be not more than 1%; the pile driver descending stage: after the pile machine is in place, the pile machine and the feeding unit are started, the central control platform transfers the parameters of 0.6m/min downlink speed of the drill rod, 1m/min uplink speed of the drill rod and 30m drilling depth to the pile machine feeding mechanism of the mixing pile machine operation module, transfers the parameters of 15r/min drilling speed of the mixing pile machine power head 103 to the power swing mechanism of the mixing pile machine operation module, the mixing pile machine operation module controls the pile machine through an electric control hydraulic multi-way steering valve according to the set parameters, applies torque in opposite directions to the upper power head and the lower power head, drilling and stirring operation in the downlink stage of the drilling machine are carried out, meanwhile, a high-pressure grouting pump is used for quantitatively distributing curing agents through a jetting port until the detection data of a drilling tool depth sensor reaches the designed drilling depth of 30m, and construction in the downlink drilling and stirring operation stage is completed.
Referring to fig. 2, the combined pile driver 1 is provided with a hydraulic leg 101, a mast 102 of a mixing pile driver and a precast pile 104, the mast 102 of the mixing pile driver is further provided with a power head 103 of the mixing pile driver, and a water tap at the power head 103 of the mixing pile driver is connected with a slurry preparing and supplying background 105 through a slurry pipeline 106.
The pile body ground pressure sensor is arranged at the bottom of the drill bit, the pile body ground pressure data can be measured in real time, when the detected ground pressure is too large, the control module and the feedback control module automatically intervene to reduce the disturbance to the surrounding environment, the drilling and stirring speed and the injection amount of the grouting pump can be reduced according to a set program algorithm, and the injection amount of each half linear meter can be further ensured to meet the design requirement; in the drilling and excavating stirring process, the control module and the feedback control module can adjust the frequency of a grouting pump according to real-time torque data and the underground pressure data information of the pile body, and then the optimal injection amount of the solidified material slurry is guaranteed through a variable-frequency slurry injection technology.
And in the ascending stage of the pile machine, the operation module of the mixing pile machine continuously controls the pile machine through the electric control hydraulic multi-way steering valve according to set parameters, clockwise and anticlockwise torques and pulling forces are applied to the upper power head and the lower power head, secondary mixing operation of the mixing pile in the ascending stage of the drilling machine is carried out until the drilling tool depth sensor detects the designed pile top construction elevation, and construction in the ascending mixing operation stage is completed.
The PHC tubular pile is driven, the central control platform transfers pile position coordinate parameters (X, Y) to a pile embracing and pressing machine operation module, a Beidou positioning sensor on the pile machine is matched with a satellite positioning system for use, the center of the PHC tubular pile is ensured to be coincided with the center of a stirring pile, the deviation is controlled within 2cm, the measurement data of a PHC tubular pile inclination angle sensor is combined, the perpendicularity of the PHC tubular pile is adjusted through a hydraulic support leg 101 of the pile machine, and the guarantee error is not more than 1%. The precast pile 104 is lifted and placed into the clamp, PHC pipe pile construction mainly depends on the precast pile enclasping mechanism and the precast pile enclasping mechanism, a central control platform transfers pile pressing force, pile pressing speed and enclasping depth parameter data to an enclasping pile press, an operation module of the enclasping pile press carries out enclasping and enclasping pressing on the PHC pipe pile through an electric control hydraulic multi-way steering valve according to various preset construction parameters to carry out pile planting operation until a depth sensor detects that the design enclasping depth reaches, and all construction work of the stiff core composite pile is completed.
The monitoring control system can acquire the output torque of the power head in real time in the construction process and continuously judge the soft and hard properties of the underground soil layer, so that the construction drilling tool can be reasonably controlled to perform drilling and stirring actions, and the problem that the conventional drilling tool cannot overcome the difficulty of implementing a large-diameter and large-depth stirring pile in a completely weathered, strongly weathered and compact sandy soil or hard plastic clay layer is solved by using a short spiral drill bit; in the construction process, the monitoring control system can adjust the drilling speed of the drilling tool according to the hardness of the soil layer, and variable-speed construction is realized through the information acquisition module and the feedback control module, so that the aims of saving working hours and solidifying materials are fulfilled. The mixing amount of the pile body curing agent, the water-cement ratio of slurry, the drilling speed during construction, the lifting speed, the rotating speed of a drilling tool and the spraying amount of the curing agent per extended meter along the depth of the pile body are determined according to the properties of a foundation soil layer, and constant preset parameters are kept in the construction process so as to meet the mixing uniformity and the design strength of the mixing pile.
Example two
The embodiment provides a monitoring and controlling method for a stiffening core composite pile, as shown in fig. 3 and 4, the method comprises the following steps:
s1: transmitting preset execution parameter information to a central control platform, and controlling a mixing pile machine operation module, a slurry making and supplying operation module and a pile embracing and pressing machine operation module by the central control platform through a control module according to the preset execution parameter information;
s2: pile position positioning data information, mast inclination angle data information, drilling tool torque data information, drilling tool feeding force data information, drilling tool rotating speed data information, drilling tool depth data information, slurry supply pipeline flow data information, slurry supply pipeline pressure data information and pile body underground pressure data information are acquired through a construction data acquisition module;
s3: feeding back data information acquired by the construction data acquisition module to the central control platform, performing compensation control on the operation of the mixing pile machine operation module, the pulping and slurry supplying operation module and the pile embracing machine operation module through the feedback control module according to a preset comparison process by the central control platform, and obtaining compensation control data information;
s4: and uploading preset execution parameter information, data information acquired by the construction data acquisition module and compensation control data information to a background server through a wireless communication module, transmitting the received information to a data storage evaluation module by the background server, and evaluating the construction quality of the stiffening core composite pile through the data storage evaluation module.
Further, the execution parameter information preset in step S1 includes pile position horizontal and vertical coordinates, water cement ratio, curing agent mixing amount, drilling and stirring speed, drilling tool lifting speed, upper and lower power head rotating speed, mixing pile construction depth, and holding pressure depth of the PHC tubular pile.
Further, the preset control instruction and the corresponding compensation control corresponding to the operation module of the mixing pile machine respectively comprise the following steps:
s31: the horizontal and vertical coordinates of the pile position are transmitted to a running module of the mixing pile machine through a central control platform, and the deviation of the pile position is controlled and adjusted according to the positioning data information of the pile position; adjusting the verticality of the mast through mast inclination angle data information; the central control platform controls the operation module of the mixing pile machine according to the drilling and digging mixing speed of the drilling tool, the lifting speed of the drilling tool and the construction depth of the mixing pile;
s32: transmitting the rotating speeds of the upper power head and the lower power head to a mixing pile machine operation module; the mixing pile machine operation module controls a pile machine according to preset execution parameter information, applies torques in opposite directions to an upper power head and a lower power head, performs drilling and mixing operation of a pile machine in a downlink stage, and completes construction of the downlink drilling and mixing operation stage by implementing quantitative injection of a curing agent at an injection port until the depth data information of a drilling tool is monitored to reach the preset construction depth of a mixing pile;
s33: monitoring ground pressure according to the data information of the underground pressure of the pile body, and controlling the drilling and excavating stirring speed and the grouting amount of a grouting pump through a feedback control module when the ground pressure is too large; adjusting the frequency of a grouting pump through a feedback control module according to the torque data information of the drilling tool so as to control the jetting amount of a curing agent;
s34: and controlling the pile machine through a pile mixing machine operation module according to preset execution parameter information, applying clockwise and anticlockwise torques and extraction forces to the upper power head and the lower power head, performing secondary mixing operation on the mixing pile in an uplink stage of the pile machine until the depth data information of the drilling tool is monitored to reach the preset construction elevation of the mixing pile, and completing construction in the uplink mixing operation stage.
Further, the preset control instruction corresponding to the pulping pulp supply operation module and the corresponding compensation control respectively comprise the following steps:
s35: determining the consumption of the curing material of each half linear meter of pile length and the converted slurry injection amount through a slurry preparation and supply operation module according to the water-cement ratio and the mixing amount of the curing agent to obtain the slurry injection amount at each second time interval;
s36: and supplying the slurry to the mixing pile machine through the slurry preparing and supplying operation module according to the flow data information of the slurry supplying pipeline and the pressure data information of the slurry supplying pipeline at the time interval of each second.
Further, the preset control instruction and the corresponding compensation control corresponding to the operation module of the pile embracing machine respectively comprise the following steps:
s37: the horizontal and vertical coordinates of the pile position are transmitted to a pile embracing and pressing machine operation module through a central control platform, and the deviation of the pile position is controlled and adjusted according to the pile position positioning data information, so that the center of the PHC tubular pile is superposed with the center of the mixing pile; adjusting the perpendicularity of the PHC tubular pile through the inclination angle data information of the PHC tubular pile;
s38: and (4) clasping and clasping the PHC pipe pile to realize pile planting until the construction data acquisition module detects that the PHC pipe pile reaches the preset clasping depth, and completing pile planting construction of the stiffened-core composite pile.
The method can acquire the output torque of the power head in real time in the construction process, and continuously judge the soft and hard properties of the underground soil layer, so that the construction drilling tool can be reasonably controlled to perform drilling and stirring actions, and the problem that the conventional drilling tool cannot overcome the difficulty of implementing a large-diameter and large-depth stirring pile in a completely weathered, strongly weathered and compact sandy soil or hard plastic clay layer is solved by using a short spiral drill bit; in the construction process, the monitoring control system can adjust the drilling speed of the drilling tool according to the hardness of the soil layer, and variable-speed construction is realized through the information acquisition module and the feedback control module, so that the aims of saving working hours and solidifying materials are fulfilled. Determining the mixing amount of the pile body cement, the water cement ratio of cement paste, the drilling speed during construction, the lifting speed, the rotating speed of a drilling tool and the spraying amount of each half-extension meter along the depth of the pile body according to the properties of a foundation soil layer, and keeping constant preset parameters in the construction process so as to meet the mixing uniformity and the design strength of the mixing pile.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and such changes and modifications will fall within the scope of the present invention.
Claims (10)
1. A monitoring control system of a stiffening core composite pile is characterized by comprising a data input screen display module, a central control platform, a mixing pile machine operation module, a pulping and slurry supplying operation module, a pile embracing and pressing machine operation module, a construction data acquisition module, a control module, a feedback control module and a data storage and evaluation module;
the data input screen display module is used for transmitting preset execution parameter information to the central control platform, and the central control platform controls the mixing pile machine operation module, the slurry making and supplying operation module and the pile embracing and pressing machine operation module through the control module according to the preset execution parameter information;
the construction data acquisition module is used for acquiring pile position positioning data information, mast inclination angle data information, drilling tool torque data information, drilling tool feeding force data information, drilling tool rotating speed data information, drilling tool depth data information, slurry supply pipeline flow data information, slurry supply pipeline pressure data information and pile body underground pressure data information;
the construction data acquisition module feeds acquired data information back to the central control platform, and the central control platform performs compensation control on the operation of the mixing pile machine operation module, the pulping and slurry supplying operation module and the holding and pressing pile machine operation module through the feedback control module according to a preset comparison flow, and obtains compensation control data information;
the data storage and evaluation module is used for receiving the preset execution parameter information, the data information acquired by the construction data acquisition module and the compensation control data information which are uploaded to the background server through the wireless communication module, and the data storage and evaluation module is used for evaluating the construction quality of the stiff core composite pile.
2. The monitoring and control system for a stiff core composite pile according to claim 1, wherein the preset execution parameter information comprises pile position horizontal and vertical coordinates, water cement ratio, curing agent mixing amount, drilling and stirring speed, drilling tool lifting speed, upper and lower power head rotating speed, stirring pile construction depth and holding pressure depth of the PHC tubular pile.
3. The monitoring and control system for stiffness core composite piles according to claim 2, wherein the preset control instructions and the corresponding compensation control corresponding to the operation module of the mixing pile machine respectively comprise:
a first control unit: the horizontal and vertical coordinates of the pile position are transmitted to the operation module of the mixing pile machine through the central control platform, and the deviation of the pile position is controlled and adjusted according to the pile position positioning data information; adjusting the verticality of the mast of the pile machine according to the mast inclination angle data information; the central control platform controls the operation module of the mixing pile machine according to the drilling and digging mixing speed, the drilling tool lifting speed and the mixing pile construction depth of a drilling tool;
a downlink stage working unit: the operation module is used for transmitting the rotating speed and the rotating direction of the upper power head and the lower power head to the mixing pile machine; the mixing pile machine operation module controls a pile machine according to the preset execution parameter information, applies torques in opposite directions to an upper power head and a lower power head, performs drilling and mixing operation of the pile machine in a downlink stage, and completes construction of the downlink drilling and mixing operation stage by implementing quantitative injection of a curing agent at an injection port until the depth data information of the drilling tool is monitored to reach the preset construction depth of the mixing pile;
an underground pressure feedback control unit: the ground pressure monitoring module is used for monitoring ground pressure according to the data information of the underground pressure of the pile body, and controlling the drilling and digging stirring speed and the grouting amount of a grouting pump through the feedback control module when the ground pressure is too large;
a slurry injection amount control unit: the frequency of a grouting pump is adjusted through the feedback control module according to the drilling tool torque data information, and then the slurry injection amount of a curing agent is controlled;
an uplink stage working unit: and the pile driving module is used for controlling the pile driver according to the preset execution parameter information, applying clockwise and anticlockwise torques and pulling force to the upper power head and the lower power head, performing secondary stirring operation on the stirring pile in an uplink stage of the pile driver until monitoring the preset construction elevation of the drilling tool depth data information reaching the stirring pile, and completing the construction in the uplink stirring operation stage.
4. The monitoring and control system for a stiff core composite pile according to claim 2, wherein the preset control instructions and the corresponding compensation control corresponding to the slurry making and supplying operation module respectively comprise:
a slurry injection amount calculation unit: the slurry supply operation module is used for determining the consumption of the curing material of each half linear meter of pile length and the converted slurry injection amount according to the water-cement ratio and the mixing amount of the curing agent, so as to obtain the slurry injection amount at each second time interval;
a pulp supply unit: and the system is used for supplying the grout to the mixing pile machine through the grout making and supplying operation module according to the flow data information of the grout supplying pipeline and the pressure data information of the grout supplying pipeline at the time interval of each second.
5. The system for monitoring and controlling a stiff core composite pile according to claim 2, wherein the preset control instructions and the corresponding compensation control corresponding to the pile driver operation module respectively comprise:
a second control unit: the horizontal and vertical coordinates of the pile position are transmitted to the pile embracing and pressing machine operation module through the central control platform, and the deviation of the pile position is controlled and adjusted according to the pile position positioning data information, so that the center of the PHC tubular pile is superposed with the center of the mixing pile; adjusting the perpendicularity of the PHC tubular pile through the inclination angle data information of the PHC tubular pile;
pile planting unit: the pile planting device is used for tightly holding and pressing the PHC pipe pile to realize pile planting until the construction data acquisition module detects that the PHC pipe pile reaches the preset holding and pressing depth, and pile planting construction of the stiffened core composite pile is completed.
6. A monitoring control method for a stiffened-core composite pile is characterized by comprising the following steps:
s1: transmitting preset execution parameter information to a central control platform, and controlling a mixing pile machine operation module, a slurry making and supplying operation module and a pile embracing and pressing machine operation module by the central control platform through a control module according to the preset execution parameter information;
s2: pile position positioning data information, mast inclination angle data information, drilling tool torque data information, drilling tool feeding force data information, drilling tool rotating speed data information, drilling tool depth data information, slurry supply pipeline flow data information, slurry supply pipeline pressure data information and pile body underground pressure data information are acquired through a construction data acquisition module;
s3: feeding back data information acquired by the construction data acquisition module to the central control platform, and performing compensation control on the operation of the mixing pile machine operation module, the pulping and slurry supplying operation module and the holding and pressing pile machine operation module by the central control platform through a feedback control module according to a preset comparison flow to obtain compensation control data information;
s4: and uploading the preset execution parameter information, the data information acquired by the construction data acquisition module and the compensation control data information to a background server through a wireless communication module, transmitting the received information to a data storage and evaluation module by the background server, and evaluating the construction quality of the stiffness core composite pile through the data storage and evaluation module.
7. The method for monitoring and controlling a stiff core composite pile according to claim 6, wherein the preset execution parameter information in step S1 includes pile position horizontal and vertical coordinates, water cement ratio, curing agent mixing amount, drilling and stirring speed, drilling tool lifting speed, upper and lower power head rotating speed, stirring pile construction depth and holding pressure depth of the PHC tubular pile.
8. The method for monitoring and controlling a stiff core composite pile according to claim 7, wherein the preset control instruction and the corresponding compensation control corresponding to the operation module of the mixing pile machine respectively comprise the steps of:
s31: the horizontal and vertical coordinates of the pile position are transmitted to the operation module of the mixing pile machine through the central control platform, and the deviation of the pile position is controlled and adjusted according to the pile position positioning data information; adjusting the verticality of the mast according to the mast inclination angle data information; the central control platform controls the operation module of the mixing pile machine according to the drilling and digging mixing speed, the drilling tool lifting speed and the mixing pile construction depth of a drilling tool;
s32: transmitting the rotating speed and the rotating direction of the upper power head and the lower power head to the operation module of the mixing pile machine; the mixing pile machine operation module controls a pile machine according to the preset execution parameter information, applies torques in opposite directions to an upper power head and a lower power head, performs drilling and mixing operation of the pile machine in a downlink stage, and completes construction of the downlink drilling and mixing operation stage by implementing quantitative injection of a curing agent at an injection port until the depth data information of the drilling tool is monitored to reach the preset construction depth of the mixing pile;
s33: monitoring ground pressure according to the data information of the underground pressure of the pile body, and controlling the drilling and digging stirring speed and the grouting amount of a grouting pump through the feedback control module when the ground pressure is too high; adjusting the frequency of a grouting pump through the feedback control module according to the drilling tool torque data information so as to control the slurry injection amount of a curing agent;
s34: according to preset execution parameter information passes through stirring stake machine operation module control stake machine to apply clockwise and anticlockwise moment of torsion and carry out the stirring stake secondary stirring operation of stake machine ascending stage to upper and lower unit head, until monitoring drilling tool degree of depth data information reaches the preset construction elevation of stirring stake, accomplish the construction of ascending stirring operation stage.
9. The monitoring and control method for a stiffness core composite pile according to claim 7, wherein the preset control instruction and the corresponding compensation control corresponding to the slurry making and supplying operation module respectively comprise the steps of:
s35: determining the consumption of the curing material of each half linear meter of pile length and the converted slurry injection amount through the slurry preparation and supply operation module according to the water-cement ratio and the mixing amount of the curing agent to obtain the slurry injection amount at each second time interval;
s36: and supplying the slurry to the mixing pile machine according to the flow data information of the slurry supply pipeline and the pressure data information of the slurry supply pipeline by the slurry preparing and supplying operation module at the time interval of each second.
10. The method for monitoring and controlling a stiff core composite pile according to claim 7, wherein the preset control instruction and the corresponding compensation control corresponding to the pile driver operation module respectively comprise the steps of:
s37: the horizontal and vertical coordinates of the pile position are transmitted to the pile embracing and pressing machine operation module through the central control platform, and the deviation of the pile position is controlled and adjusted according to the pile position positioning data information, so that the center of the PHC tubular pile is superposed with the center of the mixing pile; adjusting the perpendicularity of the PHC tubular pile through the inclination angle data information of the PHC tubular pile;
s38: and (4) clasping and clasping the PHC tubular pile to realize pile planting until the construction data acquisition module detects that the PHC tubular pile reaches the preset clasping depth, and the pile planting construction of the stiffened-core composite pile is completed.
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