CN113153272A - CFG pile drilling construction depth detection and construction control system and method - Google Patents
CFG pile drilling construction depth detection and construction control system and method Download PDFInfo
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Abstract
The invention provides a system and a method for detecting the drilling construction depth and controlling the construction of a CFG pile, 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 detecting the working parameters of the terminal servo in real time and transmitting 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, performing analog/digital conversion on the working parameters to form converted data, and transmitting the converted data to the controller; the controller is used for receiving the converted data transmitted by the data conversion unit, performing comparative analysis, summarization and storage on the converted data, and sending a working instruction to the terminal servo in real time according to the comparative analysis result; and the terminal servo is used for drilling and grouting the CFG pile according to the working instruction sent by the controller.
Description
Technical Field
The invention belongs to the technical field of building construction, relates to a building piling technology, and particularly relates to a CFG pile drilling construction depth detection and construction control system and method.
Background
The CFG pile is an abbreviation of Cement Fly-ash Gravel, and means a Cement Fly ash Gravel pile, which is a variable-strength pile made of Gravel, stone chips, sand and Fly ash mixed with Cement and water through mixing and using various pile-forming mechanical equipment. By adjusting the mixing amount and the proportion of the cement, the strength grade can be changed between C5 and C25, and the strength grade is a pile type between a rigid pile and a flexible pile. The CFG piles and the soil among the piles form a CFG pile composite foundation through the mattress layer to work together, so that engineering design can be carried out according to the properties and calculation of the composite foundation. The CFG pile is generally drilled by a long-arm spiral drill, and is formed after concrete is poured by utilizing a pump pressure in a concrete grouting pipe and is solidified. The construction process is advanced; the construction speed is high; mechanical equipment used in the pile forming process has no noise pollution; the pile forming quality is reliable; the degree of influence of geology is relatively small; the construction speed is high; can meet the design requirement of high-rise buildings with higher bearing capacity of single piles.
The long-arm spiral drill adopted in the prior art for CFG pile construction has the disadvantages that the drilling depth of the CFG pile cannot be accurately controlled, the phenomena of over drilling and over filling often occur, the filling amount of concrete is increased, and the construction cost is increased. The main reason is that the used drilling depth monitoring and controlling measures are laggard, the hole depth control in the prior art is mainly that a ruler is used for measuring and marking a dimension line on a machine body with parallel drill rods, an operator manually controls the drilling depth according to the dimension marked in advance, and the operation error is large.
Disclosure of Invention
Aiming at the problems that when the existing long-arm spiral drill is used for CFG pile construction, the drilling depth is manually controlled, the operation error is large, and the phenomenon of over drilling and over filling frequently occurs, the invention provides a CFG pile drilling construction depth detection and construction control system and method.
The specific technical scheme is as follows:
the CFG pile drilling construction depth detection and construction control system comprises a side pressure test system, a data monitoring unit, a data conversion unit, a controller and a terminal servo;
the side pressure test system is used for measuring the relation between the wall pressure of the pile hole of a corresponding soil layer in the pile hole of the CFG pile and the expansion volume change of the pile hole and transmitting the relation between the wall pressure of the pile hole and the expansion volume change of the pile hole to the controller;
the data monitoring unit is used for detecting the servo working parameters of the terminal in real time and transmitting 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, performing analog/digital conversion on the working parameters to form converted data, and transmitting the converted data to the controller;
the controller is used for receiving the converted data transmitted by the data conversion unit and the pile hole wall pressure and pile hole expansion volume change relation transmitted by the side pressure test system, performing comparative analysis, summarization and storage on the received converted data and the pile hole wall pressure and pile hole expansion volume change relation, and sending a working instruction to the terminal servo in real time according to a comparative analysis result;
and the terminal servo is used for drilling and grouting the CFG pile according to the working instruction sent by the controller.
Further limiting, the CFG pile drilling construction depth detection and construction control system further comprises a display unit, the data conversion unit transmits the converted data to the display unit, and the display unit is used for receiving and displaying the converted data.
Further defined, the working parameters comprise the drilling depth of the CFG pile, the pile filling height of the CFG pile and the bottom discharge port pressure of a drill rod of the CFG pile.
Further, the data monitoring unit comprises an infrared displacement sensor, an electromagnetic wave reflection device for the infrared displacement sensor and a pressure detection sensor positioned at the bottom of the CFG pile drill rod.
Further defined, the end servo comprises a winch, a drill rod drilling driving device or a pressure control device.
The CFG pile drilling construction depth detection and construction control method based on the CFG pile drilling construction depth detection and construction control system comprises the following steps:
1) carrying out an in-situ test lateral pressure test on the CFG pile soil layer:
drilling a test pile hole in a soil layer corresponding to a CFG pile, wherein the specification of the test pile hole is the same as that of the actual CFG pile hole, sequentially selecting a plurality of test sample points from top to bottom in the test pile hole, testing the pile hole wall pressure and the pile hole expansion volume corresponding to each test sample point by a bag pressurization method, and drawing a pile hole wall pressure and pile hole expansion volume change curve chart corresponding to each test sample point;
2) calculating the diameter D corresponding to the full CFG pile hole according to the in-situ test side pressure testCharging device；
3) Drilling a CFG pile hole;
4) and (5) performing pile grouting operation.
Further limiting, calculating the diameter D corresponding to the filled CFG pile hole according to the in-situ test side pressure testCharging deviceThe method comprises the following specific steps: measuring CFG pile drill rod bottom discharge port pressure p by using a pressure detection sensor, wherein the CFG pile drill rod bottom discharge port pressure p corresponds to the pile hole wall pressure of a test pile hole, obtaining the pile hole expansion volume V of a CFG pile corresponding to the CFG pile drill rod bottom discharge port pressure p according to the pile hole wall pressure of a test pile hole corresponding to a soil layer and the pile hole expansion volume change curve chart, and obtaining the CFG pile expansion volume V according to the formula V which is pi DCharging device 2And/4, calculating the diameter D corresponding to the full pile hole of the CFG pileCharging device。
Further limiting, the concrete steps of drilling the pile hole of the CFG pile are as follows: determining a reference plane, and adding redThe external displacement sensor is fixedly connected to the top of the CFG pile drill rod, an electromagnetic wave reflection device for the infrared displacement sensor and the bottom of the CFG pile drill rod are arranged on the reference surface, and the round trip time t of the light pulse emitted by the infrared displacement sensor is measured1And obtaining the distance a between the infrared displacement sensor and the reference surface when the CFG pile hole begins to be drilled as t1C/2, starting the winch and the drill rod drilling driving device to start drilling work, wherein the drilling depth y of the drill rod of the CFG pile is a-t c/2, and when the drill rod of the CFG pile is drilled to the bottom end of the pile hole, y is a-t2C/2; wherein t is the round-trip time of the light pulse emitted by the infrared displacement sensor in the drilling process of the drill rod of the CFG pile, and t is2The round trip time of the light pulse sent by the infrared displacement sensor when the drill rod of the CFG pile drills to the bottom end of the pile hole, and c is the propagation speed of the light; the infrared displacement sensor transmits the measured drilling depth value to the data conversion unit;
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;
and the display unit receives the converted depth value transmitted by the data conversion unit and displays the converted depth value.
Further limiting, the concrete steps of pile grouting operation are as follows: when a CFG pile drill rod drills to the bottom end of a pile hole, a drill rod drilling driving device starts to work, CFG pile materials begin to be poured into the CFG pile hole, the distance z between an infrared displacement sensor and a reference surface in the pouring process of the CFG pile materials is a-t ' c/2, t ' is the round trip time of light pulses emitted by the infrared displacement sensor in the pouring process of the CFG pile drill rod, and when the pouring height of the CFG pile materials reaches l, namely the round trip time t of the light pulses emitted by the infrared displacement sensor when the bottom end of the CFG pile drill rod reaches the pouring highest point '32(a-h)/c, wherein h is the excavation height of the foundation pit, l is the height of the pile grouting, and z is less than or equal to h + l and is greater than or equal to h; transmitting the drilling depth value measured by the infrared displacement sensor and the pressure value measured by the pressure detection sensor to the data conversion unit;
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 a converted depth value and a converted pressure value, and transmits the converted depth value and the converted pressure value to the controller and the display unit;
the display unit receives the converted depth value and the pressure value transmitted by the data conversion unit and displays the converted depth value and the converted pressure value;
the controller receives the converted depth value and the converted pressure value transmitted by the data conversion unit, performs comparative analysis, summarization and storage on the converted depth value and the converted pressure value, and sends a drilling speed lifting working instruction of the CFG pile drill rod to a terminal servo in real time according to a comparative analysis result;
and the terminal servo carries out CFG pile hole drilling work according to the drilling speed raising work instruction sent by the controller.
Further limiting, 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 chart corresponding to each test sample pointLIf the pressure p of the discharge hole at the bottom of the drill rod of the CFG pile of the corresponding soil layer detected by the pressure detection sensor is less than or equal to pLPouring according to the drilling speed of the drill rod of the CFG pile; if the pressure p of the discharge hole at the bottom of the drill rod of the CFG pile corresponding to the soil layer is more than pLReducing the pumping quantity of the CFG pile material in unit time through a pressure control device, and controlling the pressure of a discharge hole at the bottom of a drill rod of the CFG pile to ensure that p is pLI.e. the pile hole expansion volume is VL，VLLimiting pressure p for corresponding soil layerLExpanding the volume of the lower limit pile hole; stopping pouring when the height of the poured pile reaches l;
the calculation formula of the drilling speed of the CFG pile drill rod is as follows: u is 4Q/(Pi D)Charging device 2) U is the drilling speed of the CFG pile drill rod, and Q is the pumping quantity of the CFG pile material in unit time.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention relates to a CFG pile drilling construction depth detection and construction control system, which comprises a side pressure test system, a data monitoring unit, a data conversion unit, a controller and a terminal servo, wherein the side pressure test system is used for measuring the relation between the wall pressure of a pile hole of a corresponding soil layer in a CFG pile hole and the expansion volume change of the pile hole and transmitting the relation between the wall pressure of the pile hole and the expansion volume change of the pile hole to the controller; the data monitoring unit is used for detecting the servo working parameters of the terminal in real time and transmitting 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, performing analog/digital conversion on the working parameters to form converted data, and transmitting the converted data to the controller; the controller is used for receiving the converted data transmitted by the data conversion unit and the pile hole wall pressure and pile hole expansion volume change relation transmitted by the side pressure test system, performing comparative analysis, summarization and storage on the received converted data and the pile hole wall pressure and pile hole expansion volume change relation, and sending a working instruction to the terminal servo in real time according to a comparative analysis result; and the terminal servo is used for drilling and grouting the CFG pile according to the working instruction sent by the controller. The CFG pile drilling construction depth detection and construction control system can realize real-time monitoring and control of the drilling depth of the CFG pile hole, realize accurate control of the drilling depth and the 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-irrigation, avoid concrete waste during pile irrigation and save cost. The CFG pile drilling construction depth detection and construction control system can be suitable for various working places where long-arm spiral drills are used for drilling construction, can also be installed on various construction machines where fixed drill rods are used for construction, and is wide in application range.
2. The CFG pile drilling construction depth detection and construction control system also comprises a display unit, wherein the display unit is used for displaying the converted data in real time, so that construction site personnel can timely obtain and observe the drilling depth of the CFG pile hole and the pressure value of the discharge hole at the bottom of a drill rod of the CFG pile, and the drilling condition of the CFG pile hole can be manually judged and analyzed.
3. The invention relates to a CFG pile drilling construction depth detection and construction control method, which needs to perform an in-situ test and side pressure test on a CFG pile soil layer and drawTesting a change curve graph of the wall pressure of the pile hole and the expansion volume of the pile hole; diameter D corresponding to full CFG pile holeCharging device(ii) a The drilling process realizes digital, visual and automatic construction, detection and control of the CFG pile hole through the data monitoring unit, the data conversion unit, the controller, the terminal servo unit and the display unit, the workload of operators is reduced, the controllability degree of the drilling process of the whole CFG pile hole is high, and the specification of the drilled CFG pile hole and the specification of the cast pile are more accurate.
Drawings
FIG. 1 is a schematic diagram of a CFG pile drilling construction depth detection and construction control system according to the present invention;
FIG. 2 is a graph of the wall pressure of a pile hole and the volume change of the expanded pile hole measured by a first test sample point in example 3;
FIG. 3 is a graph of the wall pressure of a pile hole versus the expanded volume of the pile hole measured at a second test sample point in example 3;
FIG. 4 is a graph showing the variation of the wall pressure and the expanded volume of the pile hole in the third test sample point in example 3
The system comprises a data conversion unit 1, a controller 2, a terminal servo 3, a display unit 4 and an infrared displacement sensor 5.
Detailed Description
The technical solutions of the present invention will be further explained below with reference to the drawings and examples, but the present invention is not limited to the embodiments explained below.
Example 1
Referring to fig. 1, the lateral pressure test system of this embodiment, a data monitoring unit, a data conversion unit 1, a controller 2, a display unit 4 and a terminal servo 3, the lateral pressure test system is electrically connected to the controller 2, the lateral pressure test system includes a lateral pressure device having the same diameter as a CFG pile, a three-dimensional deformation measurement system and a pressurization stabilizing device, the data monitoring unit is electrically connected to the data conversion unit 1, the controller 2 and the display unit 4 are respectively electrically connected to the data conversion unit 1, the controller 2 is electrically connected to the terminal servo 3, the terminal servo 3 includes a winch, a drill rod drilling driving device or a pressure control device, the data monitoring unit includes 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 drill rod of the CFG pile, the infrared displacement sensor 5 is fixedly connected to a top frame of the long-arm auger drilling machine, an electromagnetic wave reflection device for an infrared displacement sensor is fixed on a reference surface, and a pressure detection sensor is fixedly connected to a discharge port at the bottom of a top rack of the long-arm spiral drilling machine; the display unit 4 is disposed at a place where a construction site worker can observe; the lateral pressure test system is used for measuring the relation between the wall pressure of the pile hole of the corresponding soil layer in the pile hole of the CFG pile and the expansion volume change of the pile hole and transmitting the relation between the wall pressure of the pile hole and the expansion volume change of the pile hole to the controller 2; the data conversion unit 1 is used for monitoring the depth value drilled by the CFG pile hole in real time and transmitting the depth value to the data conversion unit 1; the data monitoring unit detects the drilling depth of the CFG pile, the pile filling height of the CFG pile and the pressure of a discharge port at the bottom of a drill rod of the CFG pile in real time and transmits the detected drilling depth of the CFG pile, the detected pile filling height of the CFG pile and the detected pressure of the discharge port at the bottom of the drill rod of the CFG pile to the data conversion unit 1; the data conversion unit 1 receives the drilling depth of the CFG pile, the pile filling height of the CFG pile and the pressure of a discharge port at the bottom of a drill rod of the CFG pile transmitted by the data monitoring unit, performs analog/digital conversion on the drilling depth of the CFG pile, the pile filling height of the CFG pile and the pressure of the discharge port at the bottom of the drill rod of the CFG pile to form the drilling depth of the CFG pile, the pile filling height of the CFG pile and the pressure of the discharge port at the bottom of the drill rod of the CFG pile after conversion, and transmits the drilling depth of the CFG pile, the pile filling height of the CFG pile and the pressure of the discharge port at the bottom of the drill rod of the CFG pile to the controller 2 and the display unit 4; the display unit 4 receives the drilling depth of the converted CFG pile, the pile filling height of the CFG pile and the pressure of a discharge port at the bottom of a drill rod of the CFG pile transmitted by the data conversion unit 1, and displays the drilling depth of the converted CFG pile, the pile filling height of the CFG pile and the pressure of a discharge port at the bottom of the drill rod of the CFG pile;
the controller 2 receives the drilling depth of the converted CFG pile, the pile filling height of the CFG pile, the pressure of a discharge hole at the bottom of a drill rod of the CFG pile and the pressure of the wall of a pile hole and the expansion volume change relation of the pile hole transmitted by the side pressure test system transmitted by the data conversion unit 1, contrasts, analyzes, summarizes and stores the drilling depth of the converted CFG pile and the pile filling height of the CFG pile with the drilling depth of the set CFG pile and the pile filling height of the set CFG pile, contrasts, analyzes, summarizes and stores the parameters in the pressure of the discharge hole at the bottom of the drill rod of the CFG pile and the pressure of the wall of the pile hole and the expansion volume change relation of the pile hole transmitted by the side pressure test system, and sends a working instruction to a winch, a drill rod drilling driving device or a pressure control device in real time according to the contrasted analysis result; the winch, the drill rod drilling driving device or the pressure control device work according to the working instruction sent by the controller 2.
In the embodiment, the infrared displacement sensor 5 is an infrared displacement sensor, the winch provides driving force for up-and-down movement for the CFG pile drill rod, the drill rod drilling driving device provides driving force for drilling of the CFG pile drill rod, and the pressure control device is used for controlling the pressure of a discharge hole at the bottom 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 for the controller 2 to realize the functions of data comparison analysis, data summarization, data storage and the like is as follows: ForceControl, the application software is commonly used in the industry, the version and the model are V7.0, and the application software belongs to a commercially available product; the display unit 4 is a display screen, and the pressure of the discharge hole at the bottom of the drill rod of the CFG pile is within the test pressure range interval of the side pressure system.
Example 2
Different from embodiment 1, 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 in embodiment 1.
Example 3
The CFG pile drilling construction depth detection and construction control method comprises the following steps:
1) in-situ test side pressure test for CFG pile soil layer
Drilling a test pile hole in a soil layer corresponding to the CFG pile, wherein the specification of the test pile hole is the same as that of an actual CFG pile hole, the aperture of the test pile hole is 400 mm, the depth of the test pile hole is 8000 mm, three test sample points are sequentially selected from the top down in the test pile hole, the test sample points are specifically 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, and the pile hole wall pressure and the pile hole expansion volume corresponding to each test sample point are tested by a bag pressurization method;
2) calculating the diameter D corresponding to the full CFG pile hole according to the in-situ test side pressure testCharging device；
Measuring CFG pile drill rod bottom discharge port pressure p by using a pressure detection sensor, wherein the CFG pile drill rod bottom discharge port pressure p corresponds to the pile hole wall pressure of a test pile hole, obtaining the pile hole expansion volume V of a CFG pile corresponding to the CFG pile drill rod bottom discharge port pressure p according to the pile hole wall pressure of the test pile hole corresponding to a soil layer and the pile hole expansion volume change curve chart, and obtaining the formula V which is pi DCharging device 2And/4, calculating the diameter D corresponding to the full pile hole of the CFG pileCharging device；
3) Drilling CFG pile hole
Determining the ground plane of a CFG pile hole as a reference plane, fixedly connecting an infrared displacement sensor 5 to the top of a CFG pile drill rod, arranging an electromagnetic wave reflection device for the infrared displacement sensor and the bottom of the CFG pile drill rod on the reference plane, and measuring the round-trip time t of an optical pulse emitted by the infrared displacement sensor 51Is 10-7And the distance a between the infrared displacement sensor (5) and the reference surface at the beginning of drilling the CFG pile hole is obtained as t1C/2 is 15 meters, the winch and the drill rod drilling driving device are started to drill the CFG pile hole, the drilling depth y of the drill rod of the CFG pile is a-t c/2 in the process of drilling the pile hole, and when the drill rod of the CFG pile is drilled to the bottom end of the pile hole, y is a-t2When c/2 is 8000 mm, t2Is 4.66x10-8Second, wherein t is the round-trip time of the light pulse emitted by the infrared displacement sensor 5 in the drilling process of the CFG pile drill rod, and t2The round trip time of the light pulse sent by the infrared displacement sensor 5 when the drill rod of the CFG pile drills to the bottom end of the pile hole, and c is the propagation speed of the light;
4) performing pile grouting operation
When the CFG pile drill rod drills to the bottom end of the pile hole, CFG pile materials are poured into the CFG pile hole, the CFG pile materials are concrete, and the distance between the infrared displacement sensor 5 and the reference surface in the CFG pile material pouring processThe distance z is a-t ' c/2, t ' is the round trip time of the light pulse emitted by the infrared displacement sensor 5 in the process of pouring the CFG pile drill rod, and when the pouring height of the CFG pile material reaches l, the fact that the top end of the poured pile is reached, namely the round trip time t ' of the light pulse emitted by the infrared displacement sensor 5 when the bottom end of the CFG pile drill rod reaches the pouring highest point is indicated.32(a-h)/c, wherein h is 1000 mm, the foundation pit excavation height, l is 7000 mm, the pile grouting height and the z value is between h + l and h;
in 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 hole at the bottom of the drill rod measured by the pressure detection sensor are all transmitted to the data conversion unit 1;
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 bottom discharge hole of the drill rod measured by the pressure detection sensor, performs analog/digital conversion on the drilling depth value, the pouring height value and the pressure value of the bottom discharge hole of the drill rod to form a converted drilling depth value, a converted pouring height value and a converted pressure value of the bottom discharge hole of the drill rod, and transmits the drilling depth value, the poured height value and the converted pressure value of the bottom discharge hole of the drill rod to the controller 2 and the display unit 4;
the display unit 4 receives the converted drilling depth value, the pouring height value and the pressure value of the discharge hole at the bottom of the drill rod transmitted by the data conversion unit 1, and displays the drilling depth value, the pouring height value and the pressure value of the discharge hole at the bottom of the drill rod;
controller 2 receives the conversion back drilling depth value, the height value of watering and drilling rod bottom discharge mouth pressure value of data conversion unit 1 transmission to this drilling depth value, the height value of watering and drilling rod bottom discharge mouth pressure value carry out contrastive analysis, gather and store, contrastive analysis process is: according to the process of the step 3), when the controller 2 judges that the depth of the pile hole of the CFG pile meets the design requirement, sending a work instruction of stopping the lower drill rod and stopping drilling to the winch and the drill rod drilling driving device; respectively obtaining the wall pressure and the expansion volume change curve chart of the pile hole corresponding to the three test sample points at the same timeTaking the limiting pressure p of three test sample pointsL1＝1150KPa、pL21250KPa and pL31300KPa, later send the start work order to the hoist engine, control CFG stake drilling rod and begin to water the work, in watering the in-process, and judge if CFG stake drilling rod bottom discharge gate pressure p of corresponding soil layer is less than or equal to the extreme pressure of this corresponding soil layer, then water according to the speed of promoting of original CFG stake drilling rod, if CFG stake drilling rod bottom discharge gate pressure p of corresponding soil layer is greater than the extreme pressure of this corresponding soil layer, then send the pumping capacity work order that reduces CFG stake material in the unit interval to pressure control device through controller 2, reduce CFG stake drilling rod bottom discharge gate pressure, make p become p ═ pLAt the moment, the expansion volume of the pile hole is VL，VLLimiting pressure p for corresponding soil layerLExpanding the volume of the lower limit pile hole; when the pile grouting height reaches l, the controller 2 sends a work stopping instruction to the winch, and pile grouting is completed; the calculation formula of the drilling speed of the CFG pile drill rod is as follows: u is 4Q/(Pi D)Charging device 2) U is the drilling speed of a drill rod of the CFG pile, and Q is the pumping capacity of the CFG pile material in unit time;
the winch, the drill rod drilling driving device and the pressure control device all work according to the work instructions sent by the controller 2.
Before the controller 2 works, a graph of the pressure of the pile hole wall corresponding to each test sample point obtained by an in-situ test bypass pressure test and the expansion volume change of the pile hole and a corresponding diameter D after the corresponding CFG pile hole is full are input into the controller 2 in advanceCharging deviceThe hole diameter of the pile hole, the depth of the pile hole, the excavation height of the foundation pit, the pile grouting height and other parameters.
Example 4
Different from embodiment 3, in the method for detecting and controlling the drilling construction depth of the CFG pile according to the present embodiment, the aperture of the test pile hole and the aperture of the actual CFG pile hole are both 500 mm, the depth of the test pile hole is 15000 mm, four test sample points are sequentially selected from top to bottom in the test pile hole, the depth of the first test sample point is 500 mm, the depth of the second test sample point is 6500 mm, the depth of the third test sample point is 10000 mm, the depth of the fourth test sample point is 14000 mm, and the rest are the same as those in embodiment 1.
The infrared displacement sensor 5 of the present invention is not limited to the infrared displacement sensor and the digital laser infrared displacement sensor described in the above embodiments, and other non-contact infrared displacement sensors may be used.
Claims (10)
- The CFG pile drilling construction depth detection and construction control system is characterized by comprising a side pressure test system, a data monitoring unit, a data conversion unit (1), a controller (2) and a terminal servo (3);the side pressure test system is used for measuring the relation between the wall pressure of a pile hole of a corresponding soil layer in the pile hole of the CFG pile and the expansion volume change of the pile hole and transmitting the relation between the wall pressure of the pile hole and the expansion volume change of the pile hole to the controller (2);the data monitoring unit is used for detecting the working parameters of the terminal servo (3) in real time and transmitting the detected working parameters to the data conversion unit (1);the data conversion unit (1) is used for receiving the working parameters transmitted by the data monitoring unit, performing analog/digital conversion on the working parameters to form converted data, and transmitting the converted data to the controller (2);the controller (2) is used for receiving the converted data transmitted by the data conversion unit (1), the pile hole wall pressure transmitted by the side pressure test system and the pile hole expansion volume change relation, carrying out comparative analysis, summarization and storage on the received converted data and the pile hole wall pressure and pile hole expansion volume change relation, and sending a working instruction to the terminal servo (3) in real time according to a comparative analysis result;and the terminal servo (3) is used for drilling and grouting the CFG pile according to the working instruction sent by the controller (2).
- 2. The CFG pile drilling construction depth detection and construction control system according to claim 1, further comprising a display unit (4), wherein the data conversion unit (1) transmits the converted data to the display unit (4), and the display unit (4) is configured to receive and display the converted data.
- 3. The CFG pile drilling construction depth detection and construction control system according to claim 1 or 2, wherein the operation parameters include a drilling depth of the CFG pile, a pile-grouting height of the CFG pile, and a drill pipe bottom discharge pressure of the CFG pile.
- 4. The CFG pile drilling construction depth detection and construction control system as claimed in claim 3, wherein 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 at the bottom of a drill rod of the CFG pile.
- 5. The CFG pile drilling construction depth detection and construction control system as claimed in claim 4, wherein the terminal servo (3) comprises a winch, a drill pipe drilling driving device or a pressure control device.
- 6. The CFG pile drilling construction depth detection and construction control system based on claim 5 is used for realizing the CFG pile drilling construction depth detection and construction control method, and is characterized by comprising the following steps:1) carrying out an in-situ test lateral pressure test on the CFG pile soil layer:drilling a test pile hole in a soil layer corresponding to a CFG pile, wherein the specification of the test pile hole is the same as that of the actual CFG pile hole, sequentially selecting a plurality of test sample points from top to bottom in the test pile hole, testing the pile hole wall pressure and the pile hole expansion volume corresponding to each test sample point by a bag pressurization method, and drawing a pile hole wall pressure and pile hole expansion volume change curve chart corresponding to each test sample point;2) calculating the diameter D corresponding to the full CFG pile hole according to the in-situ test side pressure testCharging device；3) Drilling a CFG pile hole;4) and (5) performing pile grouting operation.
- 7. The CFG pile drilling construction depth detection and construction control method of claim 6, wherein the corresponding diameter D of the CFG pile hole after filling is calculated according to an in-situ test lateral pressure testCharging deviceThe method comprises the following specific steps: measuring CFG pile drill rod bottom discharge port pressure p, wherein the CFG pile drill rod bottom discharge port pressure p 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 CFG pile drill rod bottom discharge port pressure p according to the pile hole wall pressure of the test pile hole corresponding to the soil layer and the pile hole expansion volume change curve chart, and obtaining the formula V which is pi DCharging device 2And/4, calculating the diameter D corresponding to the full pile hole of the CFG pileCharging device。
- 8. The CFG pile drilling construction depth detection and construction control method of claim 7, wherein the CFG pile hole drilling concrete steps are as follows: determining a reference surface, fixedly connecting an infrared displacement sensor (5) to the top of a CFG pile drill rod, arranging an electromagnetic wave reflection device for the infrared displacement sensor and the bottom of the CFG pile drill rod on the reference surface, and measuring the round trip time t of a light pulse emitted by the infrared displacement sensor (5)1And obtaining the distance a between the infrared displacement sensor (5) and the reference surface when the CFG pile hole is drilled as t1C/2, starting drilling work, wherein the drilling depth y of the CFG pile drill rod is a-t c/2, and when the CFG pile drill rod drills to the bottom end of the pile hole, y is a-t2C/2; wherein t is the round-trip time of the light pulse emitted by the infrared displacement sensor (5) in the drilling process of the CFG pile drill rod, and t is the round-trip time of the light pulse2The round trip time of light pulse sent by an infrared displacement sensor (5) when a drill rod of the CFG pile drills to the bottom end of a 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);and the display unit (4) receives the converted depth value transmitted by the data conversion unit (1) and displays the converted depth value.
- 9. The CFG pile drilling construction depth detection and construction control method of claim 8, wherein the pile grouting operation comprises the following specific steps: when the CFG pile drill rod drills to the bottom end of the pile hole, pouring CFG pile materials into the CFG pile hole, wherein the distance z between the infrared displacement sensor (5) and the reference surface in the CFG pile material pouring process is a-t 'c/2, t' is the round-trip time of light pulses emitted by the infrared displacement sensor (5) in the CFG pile drill rod in the pouring process, and when the pouring height of the CFG pile materials reaches l, namely the bottom end of the CFG pile drill rod reaches the pouring highest point, the round-trip time t 'of the light pulses emitted by the infrared displacement sensor (5)'32(a-h)/c, wherein h is the excavation height of the foundation pit, l is the height of the pile grouting, and z is less than or equal to h + l and is 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 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 a converted depth value and a converted pressure value, and transmits the converted depth value and the converted pressure value to the controller (2) and the display unit (4);the display unit (4) receives the converted depth value and the pressure value transmitted by the data conversion unit (1) and displays the converted depth value and the converted pressure value;the controller (2) receives the converted depth value and the pressure value transmitted by the data conversion unit (1), performs comparative analysis, summarization and storage on the converted depth value and the converted pressure value, and sends a drilling speed lifting working instruction of the CFG pile drill rod to the terminal servo (3) in real time according to the comparative analysis result;and the terminal servo (3) performs CFG pile hole drilling work according to the drilling speed raising work instruction sent by the controller (2).
- 10. The CFG pile drilling construction depth detection and construction control method according to claim 9, wherein the specific steps of the comparative analysis are: according to the pressure of the wall of the pile hole corresponding to each test sample point and the expansion of the pile holeObtaining the limit pressure p corresponding to each test sample point by the volume change curve chartLIf the pressure p of the discharge hole at the bottom of the drill rod of the CFG pile corresponding to the soil layer is less than or equal to pLPouring according to the drilling speed of the drill rod of the CFG pile; if the pressure p of the discharge hole at the bottom of the drill rod of the CFG pile corresponding to the soil layer is more than pLReducing the pumping quantity of the CFG pile material in unit time through a pressure control device, and controlling the pressure of a discharge hole at the bottom of a drill rod of the CFG pile to ensure that p is pLI.e. the pile hole expansion volume is VL，VLLimiting pressure p for corresponding soil layerLExpanding the volume of the lower limit pile hole; stopping pouring when the height of the poured pile reaches l;the calculation formula of the drilling speed of the CFG pile drill rod is as follows: u is 4Q/(Pi D)Charging device 2) U is the drilling speed of the CFG pile drill rod, and Q is the pumping quantity of the CFG pile material in unit time.
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