CFG pile drilling construction depth detection and construction control system and method

Abstract

The present invention proposes a CFG pile drilling construction depth detection and construction control system and method, which comprises a lateral pressure test system, a data monitoring unit, a data conversion unit, a controller and a terminal servo, wherein the data monitoring unit is used for real-time detection of working parameters of the terminal servo, and transmits the detected working parameters to the data conversion unit; the data conversion unit is used for receiving the working parameters transmitted by the data monitoring unit, and performing analog / digital conversion on the working parameters to form converted data, and transmits the converted data to the controller; the controller is used for receiving the converted data transmitted by the data conversion unit, and performing comparative analysis, summary and storage on the converted data, and sending a working instruction to the terminal servo in real time according to the comparative analysis result; the terminal servo is used for performing drilling operation and pile pouring operation on the CFG pile according to the working instruction sent by the controller.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and relates to a building piling technology, and specifically to a CFG pile drilling construction depth detection and construction control system and method. Background Art

[0002] CFG pile is the abbreviation of Cement Fly-ash Gravel, which means cement fly ash gravel pile. It is a variable strength pile made of crushed stone, stone chips, sand, fly ash, cement and water, and is made by various pile-forming machinery and equipment. By adjusting the cement content and proportion, the strength grade can be changed between C5-C25. It is a pile type between rigid piles and flexible piles. CFG piles and inter-pile soil work together through the cushion layer to form a CFG pile composite foundation, so the engineering design can be carried out according to the properties and calculations of the composite foundation. CFG piles are generally drilled with a long-arm spiral drill, and concrete is poured by pump pressure in the concrete grouting pipe, and the piles are formed after solidification. The construction technology is advanced; the construction speed is fast; the machinery and equipment used in the pile-forming process have no noise pollution; the pile quality is reliable; the degree of geological influence is relatively small; the construction speed is fast; and it can meet the design requirements of high-rise buildings with high single pile bearing capacity.

[0003] The disadvantage of using a long-arm auger for CFG pile construction in the prior art is that the drilling depth of the CFG pile cannot be accurately controlled, and the phenomenon of over-drilling and over-pouring often occurs, which increases the amount of concrete poured and increases the construction cost. The main reason is that the drilling depth monitoring and control measures used are relatively backward. The prior art mainly uses a ruler to measure and mark the dimension line on the machine body parallel to the drill rod, and the operator manually controls the drilling depth according to the pre-marked dimensions, and the operation error is large. Summary of the invention

[0004] In view of the fact that when the existing long-arm auger is used for CFG pile construction, the drilling depth is manually controlled, the operation error is large, and over-drilling and over-filling often occur, the present invention proposes a CFG pile drilling construction depth detection and construction control system and method.

[0005] The specific technical solution is as follows:

[0006] CFG pile drilling construction depth detection and construction control system, including lateral pressure test system, data monitoring unit, data conversion unit, controller and terminal servo;

[0007] The lateral pressure test system is used to measure the relationship between the pile hole wall pressure and the pile hole expansion volume change of the corresponding soil layer in the CFG pile hole, and transmit the relationship between the pile hole wall pressure and the pile hole expansion volume change to the controller;

[0008] The data monitoring unit is used to detect the working parameters of the terminal servo in real time and transmit the detected working parameters to the data conversion unit;

[0009] The data conversion unit is used to receive the working parameters transmitted by the data monitoring unit, perform analog / digital conversion on the working parameters to form converted data, and transmit the converted data to the controller;

[0010] The controller is used to receive the converted data transmitted by the data conversion unit and the relationship between the pile hole wall pressure and the pile hole expansion volume change transmitted by the lateral pressure test system, and compare, analyze, summarize and store the received converted data and the relationship between the pile hole wall pressure and the pile hole expansion volume change, and send a work instruction to the terminal servo in real time according to the comparison and analysis results;

[0011] The terminal servo is used to perform drilling and pile pouring operations on the CFG piles according to the work instructions sent by the controller.

[0012] It is further defined that the CFG pile drilling construction depth detection and construction control system also includes a display unit, the data conversion unit transmits the converted data to the display unit, and the display unit is used to receive the converted data and display it.

[0013] It is further defined that the working parameters include the drilling depth of the CFG pile, the pouring height of the CFG pile and the outlet pressure at the bottom of the CFG pile drill rod.

[0014] It is further defined that the data monitoring unit includes an infrared displacement sensor, an electromagnetic wave reflection device for the infrared displacement sensor, and a pressure detection sensor located at the bottom of the CFG pile drill rod.

[0015] It is further defined that the terminal servo includes a winch, a drill pipe drilling drive device or a pressure control device.

[0016] Based on the above-mentioned CFG pile drilling construction depth detection and construction control system, a CFG pile drilling construction depth detection and construction control method is implemented, including the following steps:

[0017] 1) Conduct in-situ pressure test on CFG pile soil layer:

[0018] A test pile hole is drilled in the soil layer corresponding to the CFG pile. The specification of the test pile hole is the same as that of the actual CFG pile hole. Multiple test sample points are selected from top to bottom in the test pile hole. The pile hole wall pressure and pile hole expansion volume corresponding to each test sample point are tested by the bag pressurization method, and a change curve of the pile hole wall pressure and pile hole expansion volume corresponding to each test sample point is drawn;

[0019] 2) Calculate the corresponding diameter D of the CFG pile hole after filling based on the in-situ test pressure test 充;

[0020] 3) Drilling CFG pile holes;

[0021] 4) Carry out pile grouting operations.

[0022] Further defined, the diameter D corresponding to the CFG pile hole after filling is calculated according to the in-situ test lateral pressure test 充 The specific steps are as follows: using a pressure detection sensor to measure the discharge port pressure p at the bottom of the CFG pile drill rod, the discharge port pressure p at the bottom of the CFG pile drill rod corresponds to the pile hole wall pressure of the test pile hole, and according to the pile hole wall pressure and pile hole expansion volume change curve of the corresponding soil layer of the test pile hole, the pile hole expansion volume V of the CFG pile corresponding to the discharge port pressure p at the bottom of the CFG pile drill rod is obtained, and according to the formula V=πD 充 2 / 4, calculate the corresponding diameter D of the CFG pile hole after filling 充 .

[0023] It is further defined that the specific steps of drilling the CFG pile hole are: determining a reference plane, fixing the infrared displacement sensor on the top of the CFG pile drill rod, placing the electromagnetic wave reflection device for the infrared displacement sensor and the bottom of the CFG pile drill rod on the reference plane, measuring the round-trip time t1 of the light pulse emitted by the infrared displacement sensor, and obtaining the distance a=t1*c / 2 between the infrared displacement sensor and the reference plane when the CFG pile hole is started, starting the winch and the drill rod drilling drive device to start the drilling work, the drilling depth y=at*c / 2 of the CFG pile drill rod, and y=a-t2*c / 2 when the CFG pile drill rod is drilled to the bottom of the pile hole; wherein t is the round-trip time of the light pulse emitted by the infrared displacement sensor during the drilling process of the CFG pile drill rod, t2 is the round-trip time of the light pulse emitted by the infrared displacement sensor when the CFG pile drill rod is drilled to the bottom of the pile hole, and c is the propagation speed of light; the infrared displacement sensor transmits the measured drilling depth value to the data conversion unit;

[0024] The data conversion unit receives the depth value transmitted by the data monitoring unit, performs analog / digital conversion on the depth value to form a converted depth value, and transmits the converted depth value to the display unit;

[0025] The display unit receives the converted depth value transmitted by the data conversion unit, and displays the converted depth value.

[0026] It is further defined that the concrete steps of the pile pouring operation are as follows: when the CFG pile drill rod drills to the bottom end of the pile hole, the drill rod drilling drive device starts to work and starts pouring CFG pile material into the CFG pile hole. During the pouring process of the CFG pile material, the distance z between the infrared displacement sensor and the reference plane is a-t'*c / 2, t' is the round trip time of the light pulse emitted by the infrared displacement sensor of the CFG pile drill rod during the pouring process, when the pouring height of the CFG pile material reaches l, that is, when the bottom end of the CFG pile drill rod reaches the highest pouring point, the round trip time of the light pulse emitted by the infrared displacement sensor is t'3=2(ah) / c, wherein h is the foundation pit excavation height, l is the pile pouring height, and z is less than or equal to h+l and greater than or equal to h; the drilling depth value measured by the infrared displacement sensor and the pressure value measured by the pressure detection sensor are transmitted to the data conversion unit;

[0027] The data conversion unit receives the depth value and the pressure value transmitted by the data monitoring unit, performs analog / digital conversion on the depth value and the pressure value to form converted depth value and pressure value, and transmits the converted depth value and pressure value to the controller and the display unit;

[0028] The display unit receives the converted depth value and pressure value transmitted by the data conversion unit, and displays the converted depth value and pressure value;

[0029] The controller receives the converted depth value and pressure value transmitted by the data conversion unit, and compares, analyzes, summarizes and stores the converted depth value and pressure value, and sends the CFG pile drill rod lifting speed work instruction to the terminal servo in real time according to the comparison and analysis results;

[0030] The terminal servo performs the CFG pile hole drilling work according to the drill speed work instruction sent by the controller.

[0031] Further defined, the specific steps of the comparative analysis are: obtaining the limit pressure p corresponding to each test sample point according to the pile hole wall pressure and pile hole expansion volume change curve corresponding to each test sample point L , if the pressure at the outlet of the CFG pile drill rod bottom of the corresponding soil layer detected by the pressure detection sensor is p≤p L , pouring is carried out according to the lifting speed of the CFG pile drill rod; if the pressure at the outlet of the bottom of the CFG pile drill rod of the corresponding soil layer is p>p L , the pumping volume of CFG pile material per unit time is reduced by the pressure control device, and the pressure at the outlet of the bottom of the CFG pile drill rod is controlled so that p = p L , that is, the pile hole expansion volume is V L , V L is the ultimate pressure p of the corresponding soil layer L When the pile height reaches l, stop pouring;

[0032] The calculation formula of the drilling speed of CFG pile drill rod is: U = 4Q / (πD 充 2 ), U is the drilling speed of the CFG pile drill rod, and Q is the pumping volume of the CFG pile material per unit time.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The CFG pile drilling construction depth detection and construction control system of the present invention comprises a lateral pressure test system, a data monitoring unit, a data conversion unit, a controller and a terminal servo, wherein the lateral pressure test system is used to measure the relationship between the pile hole wall pressure and the pile hole expansion volume change of the corresponding soil layer in the pile hole of the CFG pile, and transmit the relationship between the pile hole wall pressure and the pile hole expansion volume change to the controller; the data monitoring unit is used to detect the working parameters of the terminal servo in real time, and transmit the detected working parameters to the data conversion unit; the data conversion unit is used to receive the working parameters transmitted by the data monitoring unit, and perform analog / digital conversion on the working parameters to form converted data, and transmit the converted data to the controller; the controller is used to receive the converted data transmitted by the data conversion unit and the relationship between the pile hole wall pressure and the pile hole expansion volume change transmitted by the lateral pressure test system, and compare, analyze, summarize and store the received converted data and the relationship between the pile hole wall pressure and the pile hole expansion volume change, and send a work instruction to the terminal servo in real time according to the comparison and analysis results; the terminal servo is used to perform drilling and pile pouring operations on the CFG pile according to the work instructions sent by the controller. The CFG pile drilling construction depth detection and construction control system of the present invention can realize real-time monitoring and control of the drilling depth of the CFG pile hole, realize accurate control of the drilling depth and drilling speed of the CFG pile hole, reduce the drilling error of the CFG pile hole, effectively avoid the phenomenon of over-drilling and over-filling, avoid the waste of concrete when pouring piles, and save costs. The CFG pile drilling construction depth detection and construction control system of the present invention can be applied to various workplaces suitable for long-arm spiral drills for drilling construction, and can also be installed on various construction machinery using fixed drill rods for construction, and its application range is very wide.

[0035] 2. The CFG pile drilling construction depth detection and construction control system of the present invention also includes a display unit, which is used to display the converted data in real time, so that the construction site personnel can timely obtain and observe the drilling depth of the CFG pile hole and the pressure value of the outlet at the bottom of the CFG pile drill rod, so as to manually judge and analyze the drilling situation of the CFG pile hole.

[0036] 3. The CFG pile drilling construction depth detection and construction control method of the present invention requires an in-situ test lateral pressure test on the CFG pile soil layer, and a curve diagram of the pile hole wall pressure and pile hole expansion volume change of the test pile hole is drawn; the corresponding diameter D of the CFG pile hole after filling 充 The drilling process realizes the digitization, visualization, and automated construction, detection, and control of the CFG pile hole through the data monitoring unit, data conversion unit, controller, terminal servo, and display unit, which reduces the workload of operators, makes the entire CFG pile hole drilling process highly controllable, and makes the specifications of the drilled CFG pile hole and the poured pile column more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the CFG pile drilling construction depth detection and construction control system of the present invention;

[0038] Figure 2 This is a graph showing the change in pile hole wall pressure and pile hole expansion volume at the first test sample point in Example 3;

[0039] Figure 3 This is a graph showing the change in pile hole wall pressure and pile hole expansion volume at the second test sample point in Example 3;

[0040] Figure 4 The graph showing the change of pile hole wall pressure and pile hole expansion volume at the third test point in Example 3

[0041] Among them, 1-data conversion unit, 2-controller, 3-terminal servo, 4-display unit, 5-infrared displacement sensor. DETAILED DESCRIPTION

[0042] The technical solution of the present invention is further explained below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the implementation modes described below.

[0043] Example 1

[0044] See also Figure 1In this embodiment, the lateral pressure test system, the data monitoring unit, the data conversion unit 1, the controller 2, the display unit 4 and the terminal servo 3, the lateral pressure test system is electrically connected to the controller 2, the lateral pressure test system includes a lateral pressure gauge with the same diameter as the CFG pile, a three-dimensional deformation measurement system and a pressurization stabilization device, the data monitoring unit is electrically connected to the data conversion unit 1, the controller 2 and the display unit 4 are electrically connected to the data conversion unit 1 respectively, the controller 2 is electrically connected to the terminal servo 3, the terminal servo 3 includes a winch, a drill rod drilling drive device or a pressure control device, the data monitoring unit includes an infrared displacement sensor 5, for infrared displacement sensor The electromagnetic wave reflection device and the pressure detection sensor at the bottom of the CFG pile drill rod are fixedly connected to the top frame of the long-arm spiral drill. The electromagnetic wave reflection device for the infrared displacement sensor is fixed on the reference plane, and the pressure detection sensor is fixedly connected to the bottom discharge port of the top frame of the long-arm spiral drill. The display unit 4 is arranged in a place where the construction personnel at the construction site can observe. The lateral pressure test system is used to measure the relationship between the pile hole wall pressure and the pile hole expansion volume change of the corresponding soil layer in the CFG pile hole, and transmit the relationship between the pile hole wall pressure and the pile hole expansion volume change to the controller 2; the data conversion unit 1 is used to realize The data conversion unit 1 monitors the depth value of the CFG pile hole drilling in real time, and transmits the depth value to the data conversion unit 1; the data monitoring unit detects the drilling depth of the CFG pile, the pile height of the CFG pile and the pressure of the discharge port at the bottom of the CFG pile drill rod in real time, and transmits the detected drilling depth of the CFG pile, the pile height of the CFG pile and the pressure of the discharge port at the bottom of the CFG pile drill rod to the data conversion unit 1; the data conversion unit 1 receives the drilling depth of the CFG pile, the pile height of the CFG pile and the pressure of the discharge port at the bottom of the CFG pile drill rod transmitted by the data monitoring unit, and The pressure at the discharge port at the bottom of the drill pipe is converted into analog / digital data to form the drilling depth of the converted CFG pile, the pile height of the CFG pile and the pressure at the discharge port at the bottom of the CFG pile drill pipe, and the drilling depth of the converted CFG pile, the pile height of the CFG pile and the pressure at the discharge port at the bottom of the CFG pile drill pipe are transmitted to the controller 2 and the display unit 4; the display unit 4 receives the drilling depth of the converted CFG pile, the pile height of the CFG pile and the pressure at the discharge port at the bottom of the CFG pile drill pipe transmitted by the data conversion unit 1, and displays the drilling depth of the converted CFG pile, the pile height of the CFG pile and the pressure at the discharge port at the bottom of the CFG pile drill pipe;

[0045] The controller 2 receives the drilling depth of the converted CFG pile, the pile filling height of the CFG pile, the discharge port pressure at the bottom of the CFG pile drill rod, and the relationship between the pile hole wall pressure and the pile hole expansion volume transmitted by the lateral pressure test system, and compares, analyzes, summarizes and stores the drilling depth of the converted CFG pile and the pile filling height of the CFG pile with the set CFG pile drilling depth and the set CFG pile filling height, compares, analyzes, summarizes and stores the parameters in the relationship between the discharge port pressure at the bottom of the CFG pile drill rod and the pile hole wall pressure and the pile hole expansion volume transmitted by the lateral pressure test system, and sends work instructions to the winch, drill rod drilling drive or pressure control device in real time according to the comparison and analysis results; the winch, drill rod drilling drive or pressure control device works according to the work instructions sent by the controller 2.

[0046] In this embodiment, the infrared displacement sensor 5 is an infrared displacement sensor, the winch provides the driving force for the up and down movement of the CFG pile drill rod, the drill rod drilling drive device provides the driving force for the drilling of the CFG pile drill rod, and the pressure control device is used to control the pressure of the bottom outlet of the CFG pile drill rod; the data conversion unit 1 is an analog-to-digital converter; the controller 2 is a computer, and the application software of the controller 2 to realize the functions of data comparison and analysis, data aggregation and data storage is: ForceControl, which is commonly used in the industry, and its version and model are V7.0, which is a commercially available product; the display unit 4 is a display screen, and the pressure of the bottom outlet of the CFG pile drill rod is within the test pressure range of the lateral pressure system.

[0047] Example 2

[0048] What is different from the first embodiment is that in the CFG pile drilling construction depth detection and construction control system of the present embodiment, the infrared displacement sensor 5 is a digital laser infrared displacement sensor, which is the same as that of the first embodiment.

[0049] Example 3

[0050] The CFG pile drilling construction depth detection and construction control method of this embodiment comprises the following steps:

[0051] 1) Conduct in-situ pressure test on CFG pile soil layer

[0052] A test pile hole is drilled in the soil layer corresponding to the CFG pile. The specifications of the test pile hole are the same as those of the actual CFG pile hole. The diameter of the test pile hole is 400 mm, and the depth of the test pile hole is 8000 mm. Three test sample points are selected from top to bottom in the test pile hole. The test sample points are selected according to the distribution of the soil layer in the test pile hole. The depth of the first test sample point is 1200 mm, the depth of the second test sample point is 3800 mm, and the depth of the third test sample point is 7200 mm. The pile hole wall pressure and pile hole expansion volume corresponding to each test sample point are tested by the bag pressurization method.

[0053] 2) Calculate the corresponding diameter D of the CFG pile hole after filling based on the in-situ test pressure test 充 ;

[0054] The pressure p at the discharge port at the bottom of the CFG pile drill rod is measured by a pressure detection sensor. The pressure p at the discharge port at the bottom of the CFG pile drill rod corresponds to the pressure of the pile hole wall of the test pile hole. The pile hole expansion volume V corresponding to the pressure p at the discharge port at the bottom of the CFG pile drill rod is obtained according to the change curve of the pile hole wall pressure and the pile hole expansion volume of the corresponding soil layer of the test pile hole. According to the formula V=πD 充 2 / 4, calculate the corresponding diameter D of the CFG pile hole after filling 充 ;

[0055] 3) Drilling CFG pile holes

[0056] The ground plane of the CFG pile hole is determined as the reference plane. The infrared displacement sensor 5 is fixedly connected to the top of the CFG pile drill rod. The electromagnetic wave reflection device for the infrared displacement sensor and the bottom of the CFG pile drill rod are placed on the reference plane. The round-trip time t1 of the light pulse emitted by the infrared displacement sensor 5 is measured to be 10 -7 seconds, and it is found that when the CFG pile hole is started to be drilled, the distance between the infrared displacement sensor (5) and the reference surface is a=t1*c / 2=15 meters. The winch and the drill rod drilling drive device are started to start drilling the CFG pile hole. During the drilling process, the drilling depth of the CFG pile drill rod is y=at*c / 2. When the CFG pile drill rod reaches the bottom of the pile hole, y=a-t2*c / 2=8000㎜, and t2 is 4.66x10 -8 seconds, where t is the round trip time of the light pulse emitted by the infrared displacement sensor 5 during the drilling process of the CFG pile drill rod, t2 is the round trip time of the light pulse emitted by the infrared displacement sensor 5 when the CFG pile drill rod is drilled to the bottom of the pile hole, and c is the propagation speed of light;

[0057] 4) Carry out pile pouring operation

[0058] When the CFG pile drill rod drills to the bottom of the pile hole, the CFG pile material begins to be poured into the CFG pile hole. The CFG pile material is concrete. During the pouring process of the CFG pile material, the distance z between the infrared displacement sensor 5 and the reference plane is a-t'*c / 2, t' is the round-trip time of the light pulse emitted by the infrared displacement sensor 5 during the pouring process of the CFG pile drill rod. When the pouring height of the CFG pile material reaches l, it indicates that the top of the pile has been reached, that is, the round-trip time of the light pulse emitted by the infrared displacement sensor 5 when the bottom end of the CFG pile drill rod reaches the highest pouring point is t'3=2(ah) / c, wherein h=1000㎜ is the foundation pit excavation height, l=7000㎜ is the pile height, and the z value is between h+l and h;

[0059] During the construction process, the drilling depth value measured by the infrared displacement sensor 5, the pouring height value measured by the infrared displacement sensor 5, and the pressure value of the discharge port at the bottom of the drill pipe measured by the pressure detection sensor are all transmitted to the data conversion unit 1;

[0060] The data conversion unit 1 receives the drilling depth value measured by the infrared displacement sensor 5, the pouring height value measured by the infrared displacement sensor 5, and the pressure value of the discharge port at the bottom of the drill rod measured by the pressure detection sensor, and performs analog / digital conversion on the drilling depth value, the pouring height value, and the pressure value of the discharge port at the bottom of the drill rod to form the converted drilling depth value, the pouring height value, and the pressure value of the discharge port at the bottom of the drill rod, and transmits the drilling depth value, the pouring height value, and the pressure value of the discharge port at the bottom of the drill rod to the controller 2 and the display unit 4;

[0061] The display unit 4 receives the converted drilling depth value, pouring height value and pressure value of the discharge port at the bottom of the drill pipe transmitted by the data conversion unit 1, and displays the drilling depth value, pouring height value and pressure value of the discharge port at the bottom of the drill pipe;

[0062] The controller 2 receives the converted drilling depth value, pouring height value and pressure value of the bottom outlet of the drill rod transmitted by the data conversion unit 1, and compares, analyzes, summarizes and stores the drilling depth value, pouring height value and pressure value of the bottom outlet of the drill rod. The comparison and analysis process is as follows: according to the process of step 3), when the controller 2 determines that the depth of the CFG pile hole reaches the design requirement, it sends a stop drill rod and stop drilling work instruction to the winch and the drill rod drilling drive device; at the same time, the ultimate pressure p of the three test points is obtained respectively through the pile hole wall pressure and pile hole expansion volume change curve corresponding to the three test points L1 =1150KPa, p L2 =1250KPa and p L3=1300KPa, then send a start work instruction to the winch to control the CFG pile drill rod to start pouring. During the pouring process, if it is judged that the pressure p of the discharge port at the bottom of the CFG pile drill rod of the corresponding soil layer is less than or equal to the ultimate pressure of the corresponding soil layer, pouring is carried out according to the original drilling speed of the CFG pile drill rod. If the pressure p of the discharge port at the bottom of the CFG pile drill rod of the corresponding soil layer is greater than the ultimate pressure of the corresponding soil layer, a work instruction to reduce the pumping amount of CFG pile material per unit time is sent to the pressure control device through the controller 2 to reduce the pressure of the discharge port at the bottom of the CFG pile drill rod, so that p=p L , at this time the pile hole expansion volume is V L , V L is the ultimate pressure p of the corresponding soil layer L The maximum pile hole expansion volume under the condition of pile filling is 1; when the pile filling height reaches l, the controller 2 sends a stop working command to the winch, and the pile filling is completed; the calculation formula for the lifting speed of the CFG pile drill rod is: U = 4Q / (πD 充 2 ), U is the drilling speed of the CFG pile drill rod, and Q is the pumping volume of the CFG pile material per unit time;

[0063] The winch, the drill rod drilling drive device and the pressure control device all work according to the working instructions sent by the controller 2.

[0064] Before the controller 2 works, it is necessary to input the pile hole wall pressure and pile hole expansion volume change curve corresponding to each test sample point obtained by the in-situ test lateral pressure test into the controller 2 in advance, as well as the corresponding diameter D of the CFG pile hole after filling. 充 , pile hole diameter, pile hole depth, foundation pit excavation height and pile casting height and other parameters.

[0065] Example 4

[0066] Different from Example 3, in the CFG pile drilling construction depth detection and construction control method of this embodiment, the aperture of the test pile hole and the aperture of the actual CFG pile hole are both 500㎜, the depth of the test pile hole is 15000㎜, and four test sample points are selected from top to bottom in the test pile hole, the depth of the first test sample point is 500㎜, the depth of the second test sample point is 6500㎜, the depth of the third test sample point is 10000㎜, and the depth of the fourth test sample point is 14000㎜, and the rest are the same as Example 1.

[0067] The infrared displacement sensor 5 of the present invention is not limited to the infrared displacement sensor and digital laser infrared displacement sensor described in the above embodiments, and other non-contact infrared displacement sensors may also be used.

Claims

1. A working method based on CFG pile drilling construction depth detection and construction control system, characterized in that: The CFG pile drilling construction depth detection and construction control system comprises a lateral pressure test system, a data monitoring unit, a data conversion unit (1), a controller (2) and a terminal servo (3); The lateral pressure test system is used to measure the relationship between the pile hole wall pressure and the pile hole expansion volume change of the corresponding soil layer in the CFG pile hole, and transmit the relationship between the pile hole wall pressure and the pile hole expansion volume change to the controller (2); The data monitoring unit is used to detect the working parameters of the terminal servo (3) in real time, and transmit the detected working parameters to the data conversion unit (1); The data conversion unit (1) is used to receive the working parameters transmitted by the data monitoring unit, perform analog / digital conversion on the working parameters to form converted data, and transmit the converted data to the controller (2); The controller (2) is used to receive the converted data transmitted by the data conversion unit (1) and the relationship between the pile hole wall pressure and the pile hole expansion volume change transmitted by the lateral pressure test system, and to compare, analyze, summarize and store the received converted data and the relationship between the pile hole wall pressure and the pile hole expansion volume change, and to send a work instruction to the terminal servo (3) in real time according to the comparison and analysis results; The terminal servo (3) is used to perform drilling and pile pouring operations on the CFG piles according to the work instructions sent by the controller (2); The working method comprises the following steps: 1) Conduct in-situ pressure test on CFG pile soil layer: A test pile hole is drilled in the soil layer corresponding to the CFG pile. The specification of the test pile hole is the same as that of the actual CFG pile hole. Multiple test sample points are selected from top to bottom in the test pile hole. The pile hole wall pressure and pile hole expansion volume corresponding to each test sample point are tested by the bag pressurization method, and a change curve of the pile hole wall pressure and pile hole expansion volume corresponding to each test sample point is drawn; 2) Calculate the corresponding diameter D of the CFG pile hole after filling based on the in-situ test pressure test 充 ; 3) Drilling CFG pile holes; 4) Carry out pile pouring operation; The diameter D corresponding to the CFG pile hole after filling is calculated according to the in-situ test lateral pressure test 充 The specific steps are: measuring the discharge port pressure p at the bottom of the CFG pile drill rod, which corresponds to the pile hole wall pressure of the test pile hole; obtaining the pile hole expansion volume V of the CFG pile corresponding to the discharge port pressure p at the bottom of the CFG pile drill rod according to the pile hole wall pressure and pile hole expansion volume change curve of the corresponding soil layer of the test pile hole; calculating the corresponding diameter D of the CFG pile after the pile hole is filled 充 ; The concrete steps of the pile pouring operation are as follows: when the CFG pile drill rod drills to the bottom of the pile hole, the CFG pile material is poured into the CFG pile hole; during the pouring process of the CFG pile material, the distance between the infrared displacement sensor (5) of the data monitoring unit and the reference surface is z=a-t'*c / 2, t' is the round trip time of the light pulse emitted by the infrared displacement sensor (5) during the pouring process of the CFG pile drill rod; when the pouring height of the CFG pile material reaches l, that is, when the bottom end of the CFG pile drill rod reaches the highest pouring point, the round trip time of the light pulse emitted by the infrared displacement sensor (5) is t'3=2(ah) / c, wherein h is the excavation height of the foundation pit, l is the pouring height, and z is less than or equal to h+l and greater than or equal to h; the drilling depth value measured by the infrared displacement sensor (5) and the pressure value measured by the pressure detection sensor are transmitted to the data conversion unit (1); The comparative analysis is as follows: according to the pile hole wall pressure and pile hole expansion volume change curve corresponding to each test sample point, the limit pressure p corresponding to each test sample point is obtained. L , if the pressure at the bottom outlet of the CFG pile drill rod of the corresponding soil layer is p≤p L , pouring is carried out according to the lifting speed of the CFG pile drill rod; if the pressure at the outlet of the bottom of the CFG pile drill rod of the corresponding soil layer is p>p L , the pressure control device of the terminal servo (3) reduces the pumping volume of the CFG pile material per unit time and controls the pressure at the outlet of the bottom of the CFG pile drill rod so that p = p L , that is, the pile hole expansion volume is V L , V L is the ultimate pressure p of the corresponding soil layer L When the pile height reaches l, stop pouring; The calculation formula of the drilling speed of CFG pile drill rod is: U = 4Q / (πD 充 2 ), U is the drilling speed of the CFG pile drill rod, and Q is the pumping volume of the CFG pile material per unit time.

2. The working method based on CFG pile drilling construction depth detection and construction control system as claimed in claim 1, characterized in that: The CFG pile drilling construction depth detection and construction control system further comprises a display unit (4); the data conversion unit (1) transmits the converted data to the display unit (4); and the display unit (4) is used to receive the converted data and display it.

3. The working method based on CFG pile drilling construction depth detection and construction control system as claimed in claim 1 or 2, characterized in that: The working parameters include the drilling depth of the CFG pile, the pouring height of the CFG pile and the outlet pressure at the bottom of the CFG pile drill rod.

4. The working method based on CFG pile drilling construction depth detection and construction control system as claimed in claim 3 is characterized in that: The data monitoring unit comprises an infrared displacement sensor (5), an electromagnetic wave reflection device for the infrared displacement sensor, and a pressure detection sensor located at the bottom of the CFG pile drill rod.

5. The working method based on CFG pile drilling construction depth detection and construction control system as claimed in claim 4, characterized in that: The terminal servo (3) comprises a winch, a drill rod drilling drive device and a pressure control device.

6. The working method based on CFG pile drilling construction depth detection and construction control system as claimed in claim 1, characterized in that: The specific steps of drilling the CFG pile hole are as follows: determining a reference plane, fixing an infrared displacement sensor (5) on the top of the CFG pile drill rod, placing an electromagnetic wave reflection device for the infrared displacement sensor and the bottom of the CFG pile drill rod on the reference plane, measuring the round trip time t1 of the light pulse emitted by the infrared displacement sensor (5), obtaining a distance a=t1*c / 2 between the infrared displacement sensor (5) and the reference plane when the CFG pile hole is started to be drilled, starting the drilling work, the drilling depth y=at*c / 2 of the CFG pile drill rod, and when the CFG pile drill rod reaches the bottom of the pile hole y=a-t2*c / 2; wherein t is the round trip time of the light pulse emitted by the infrared displacement sensor (5) during the drilling process of the CFG pile drill rod, t2 is the round trip time of the light pulse emitted by the infrared displacement sensor (5) when the CFG pile drill rod reaches the bottom of the pile hole, and c is the propagation speed of light; the infrared displacement sensor (5) transmits the measured drilling depth value to the data conversion unit (1); The data conversion unit (1) receives the depth value transmitted by the data monitoring unit, performs analog / digital conversion on the depth value to form a converted depth value, and transmits the converted depth value to the display unit (4); The display unit (4) receives the converted depth value transmitted by the data conversion unit (1) and displays the converted depth value.

7. The working method based on CFG pile drilling construction depth detection and construction control system as claimed in claim 6, characterized in that: The data conversion unit (1) receives the depth value and the pressure value transmitted by the data monitoring unit, performs analog / digital conversion on the depth value and the pressure value to form converted depth value and pressure value, and transmits the converted depth value and pressure value to the controller (2) and the display unit (4); The display unit (4) receives the converted depth value and pressure value transmitted by the data conversion unit (1), and displays the converted depth value and pressure value; The controller (2) receives the converted depth value and pressure value transmitted by the data conversion unit (1), compares, analyzes, summarizes and stores the converted depth value and pressure value, and sends a drilling speed work instruction of the CFG pile drill rod to the terminal servo (3) in real time according to the comparison and analysis results; The terminal servo (3) performs the CFG pile hole drilling work according to the drill speed work instruction sent by the controller (2).

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