CN113123778B - Device and method for monitoring pile forming diameter of high-pressure jet grouting pile in real time - Google Patents
Device and method for monitoring pile forming diameter of high-pressure jet grouting pile in real time Download PDFInfo
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- CN113123778B CN113123778B CN202110307596.XA CN202110307596A CN113123778B CN 113123778 B CN113123778 B CN 113123778B CN 202110307596 A CN202110307596 A CN 202110307596A CN 113123778 B CN113123778 B CN 113123778B
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- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000012544 monitoring process Methods 0.000 title claims abstract description 16
- 239000000523 sample Substances 0.000 claims abstract description 75
- 238000005553 drilling Methods 0.000 claims abstract description 48
- 230000008569 process Effects 0.000 claims abstract description 20
- 238000012806 monitoring device Methods 0.000 claims abstract description 12
- 230000007246 mechanism Effects 0.000 claims abstract description 7
- 239000002689 soil Substances 0.000 claims description 59
- 239000012530 fluid Substances 0.000 claims description 36
- 239000002002 slurry Substances 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 238000005507 spraying Methods 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 238000013461 design Methods 0.000 claims description 13
- 238000012545 processing Methods 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 abstract description 15
- 239000000463 material Substances 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 description 8
- 239000007921 spray Substances 0.000 description 8
- 230000009471 action Effects 0.000 description 4
- 239000004568 cement Substances 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005288 electromagnetic effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- Remote Sensing (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geophysics (AREA)
- Geochemistry & Mineralogy (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a high-pressure jet grouting pile forming diameter real-time monitoring device and a high-pressure jet grouting pile forming diameter real-time monitoring method, wherein the device is arranged on a drilling machine, the drilling machine comprises a drilling rod, a nozzle arranged on the drilling rod and a driving mechanism for driving the drilling rod to rotate, the high-pressure jet grouting pile forming diameter real-time monitoring device comprises a first protection box, an ultrasonic probe and a processor, the first protection box is arranged on the drilling rod and is positioned below the nozzle, the ultrasonic probe is arranged in the first protection box, the ultrasonic probe is connected with a wireless signal transmitting device, the processor is connected with a wireless signal receiving device, and the wireless signal transmitting device is connected with the wireless signal receiving device. The invention can monitor the pile forming diameter in real time in the pile forming construction process of the high-pressure jet grouting pile, not only can avoid potential safety hazards caused by insufficient pile diameter of the high-pressure jet grouting pile, but also can avoid material waste caused by overlarge pile diameter of the high-pressure jet grouting pile.
Description
Technical Field
The invention belongs to the technical field of constructional engineering, and particularly relates to a device and a method for monitoring pile forming diameter of a high-pressure jet grouting pile in real time.
Background
The high-pressure jet grouting pile technology is mainly used for foundation reinforcement and waterproof curtain formation in engineering, and has the characteristics of small construction occupation, small vibration, low noise, relatively low cost and the like, so that the application is wider. The principle of the high-pressure jet grouting pile is that a drilling machine is used for drilling a drilling rod with a special nozzle to a soil layer with a designed depth, slurry is sprayed out from the nozzle under the pressure of 20-40 MPa to form jet flow impact to destroy an undisturbed soil layer, destroyed soil particles and the slurry are stirred and mixed to form rearranged mixed fluid, and a consolidated body is formed in the soil after solidification. The construction process comprises a single-pipe method (only spraying cement slurry), a double-pipe method (spraying cement slurry and air), and a three-pipe method (spraying cement slurry and air and water), wherein the three processes are selected comprehensively according to the diameter of the rotary pile and the stratum condition.
The pile forming diameter is one of important control indexes for high-pressure jet grouting pile construction, but the action mechanism of a high-pressure fluid cutting soil body is complex, and the soil body is variable, so that the mechanism is difficult to study, so that no mature theory is provided for explaining the control mechanism of the pile forming diameter, construction parameters are controlled only by means of construction experience in construction, uncertainty is increased, phenomena such as pile breakage and necking are often caused, pile forming quality control of the high-pressure jet grouting pile is always a construction difficulty, and the current construction process parameter acquisition lacks an effective monitoring method for pile forming diameter parameters, so that a waterproof curtain cannot be completely meshed or the bearing capacity of a reinforced pile cannot meet the requirements.
Disclosure of Invention
The invention aims to provide a real-time monitoring device for the pile forming diameter of a high-pressure jet grouting pile, which can monitor the pile forming diameter in real time in the pile forming construction process of the high-pressure jet grouting pile, can avoid potential safety hazards caused by insufficient pile diameter of the high-pressure jet grouting pile, and can also avoid material waste caused by overlarge pile diameter of the high-pressure jet grouting pile.
The invention is realized by the following technical scheme:
The utility model provides a high pressure jet grouting pile diameter real-time supervision device for set up on the rig, the rig is including boring the spray lance, set up nozzle and the actuating mechanism that the drive bore the spray lance and rotate on boring the spray lance, high pressure jet grouting pile diameter real-time supervision device includes first protection box, ultrasonic transducer and treater, first protection box sets up on boring the spray lance and is located the below of nozzle, ultrasonic transducer sets up in first protection box, ultrasonic transducer is connected with wireless signal transmitting device, the treater is connected with wireless signal receiving device, wireless signal transmitting device is connected with wireless signal receiving device.
Further, the drill spray lance includes upper portion pipeline section, first connecting pipeline section, middle part pipeline section, second connecting pipeline section and lower part pipeline section that connect gradually, first connecting pipeline section and second connecting pipeline section are the cavity setting, wireless signal receiving arrangement sets up in first connecting pipeline section, first connecting hole has been seted up to the outer wall of second connecting pipeline section, wireless signal transmitting arrangement sets up in the second connecting pipeline section, first protection box sets up on the second connecting pipeline section, and its one side that is close to the second connecting pipeline section has been seted up the second connecting hole that corresponds with first connecting hole, ultrasonic probe passes second connecting hole and first connecting hole in proper order through the wire and is connected with wireless signal transmitting arrangement electricity.
Further, the wireless signal transmitting device comprises a second protection box, an electromagnetic signal transmitting coil and a circuit amplifying module, wherein the second protection box is arranged at the top end of the inside of the second connecting pipe section, the electromagnetic signal transmitting coil is vertically arranged in the second protection box, and the circuit amplifying module is arranged in the second protection box and is electrically connected with the electromagnetic signal transmitting coil and the ultrasonic probe through leads respectively;
The wireless signal receiving device comprises a third protection box, an electromagnetic signal receiving coil and an output signal interface, wherein the third protection box is arranged in the first connecting pipe section, the electromagnetic signal receiving coil is vertically arranged in the third protection box, the output signal interface is arranged outside the first connecting pipe section and is electrically connected with the electromagnetic signal receiving coil through a wire, and the processor is electrically connected with the output signal interface.
Further, the third protection box is connected with the first connecting pipe through a plurality of steel wires.
Further, the electromagnetic signal transmitting coil is connected with the second protection box through a plurality of first connecting rods, and the electromagnetic signal receiving coil is connected with the third protection box through a plurality of second connecting rods.
Further, a steel sleeve is sleeved outside a wire connected between the output signal interface and the electromagnetic signal receiving coil, one end of the steel sleeve is connected with the third protection box, and the other end of the steel sleeve is connected with the first connecting pipe section.
Further, the two ends of the ultrasonic probe are provided with third connecting rods, and the third connecting rods are connected with the first protection box through a plurality of elastic pieces.
Further, one side of the first protection box, which is close to the drilling and spraying rod, is provided with a rubber ring.
Further, the processor includes a processing chip and a display coupled to the processing chip.
The invention also provides a real-time monitoring method for the pile forming diameter of the high-pressure jet grouting pile, which comprises the following steps:
Drilling and sampling a target site, crushing soil samples of different stratum obtained by sampling, pouring the crushed soil samples into a cylinder, adding slurry into the cylinder according to a preset design proportion, and stirring to form a first mixed fluid, wherein the diameter of the cylinder is the same as the design diameter of the high-pressure jet grouting pile;
the ultrasonic probe is stretched into the first mixed fluid for measurement, and whether the ultrasonic probe can receive reflected waves or not is detected;
If yes, determining the transmitting frequency of the current ultrasonic probe as the working transmitting frequency;
Respectively crushing the sampled soil samples of different strata, respectively adding the crushed soil samples and the slurry specified by the preset design into different cylinders, and stirring to form second mixed fluid corresponding to each stratum;
For the second mixed fluid corresponding to each stratum, an ultrasonic probe is extended into the second mixed fluid, and the ultrasonic probe is controlled to emit working ultrasonic waves at a working emission frequency, so that the propagation speed of the working ultrasonic waves in each second mixed fluid is obtained;
in the process of drilling a hole under a drilling and spraying rod, controlling an ultrasonic probe to emit working ultrasonic waves at a working emission frequency, acquiring the time difference between the sending of the working ultrasonic waves and the receiving of reflected waves by the ultrasonic probe in real time, acquiring the propagation speed of the working ultrasonic waves in a second mixed fluid corresponding to a target soil layer according to the current target soil layer of the ultrasonic probe, and calculating the pile forming diameter of the high-pressure jet grouting pile in real time.
Compared with the prior art, the invention has the beneficial effects that: the ultrasonic probe can detect the position of the solid-liquid interface, and outputs signals measured in real time to the processor through the wireless signal transmitting device and the wireless signal receiving device, and the processor calculates the pile diameter of the high-pressure jet grouting pile according to the received signals, so that the pile diameter of the high-pressure jet grouting pile is monitored in real time, potential safety hazards caused by insufficient pile diameter of the high-pressure jet grouting pile can be avoided, and material waste caused by overlarge pile diameter of the high-pressure jet grouting pile can be avoided; the invention has wide applicability, can be suitable for single-pipe method, double-pipe method and three-pipe method, ensures that the pile forming diameter of the high-pressure jet grouting pile meets the design requirement, and can effectively improve the construction quality of the high-pressure jet grouting pile.
Drawings
FIG. 1 is a schematic structural view of a real-time monitoring device for pile forming diameter of a high-pressure jet grouting pile;
FIG. 2 is a schematic view of a part of a real-time monitoring device for pile diameter of a high-pressure jet grouting pile;
FIG. 3 is another partial schematic view of the high pressure jet grouting pile forming diameter real-time monitoring device of the invention.
In the figure, 1-drilling machine, 11-drilling spray rod, 111-upper pipe section, 112-first connecting pipe section, 113-middle pipe section, 114-second connecting pipe section, 115-lower pipe section, 12-nozzle, 2 first protection box, 21-rubber ring, 3-ultrasonic probe, 4-wireless signal transmitting device, 41-second protection box, 42-electromagnetic signal transmitting coil, 43-circuit amplifying module, 44-first connecting rod, 5-wireless signal receiving device, 51-third protection box, 52-electromagnetic signal receiving coil, 53-output signal interface, 54-steel wire, 55-second connecting rod, 56-steel sleeve, 6-third connecting rod, 7-elastic piece and 8-processor.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in use, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.
Referring to fig. 1 to 3, fig. 1 is a schematic structural diagram of a real-time monitoring device for pile forming diameter of a high-pressure jet grouting pile according to the present invention, fig. 2 is a schematic partial diagram of the real-time monitoring device for pile forming diameter of a high-pressure jet grouting pile according to the present invention, and fig. 3 is another schematic partial diagram of the real-time monitoring device for pile forming diameter of a high-pressure jet grouting pile according to the present invention.
The invention relates to a real-time monitoring device for pile diameter of high-pressure jet grouting piles, which is used for being arranged on a drilling machine 1, wherein the drilling machine 1 comprises a drilling rod 11, a nozzle 12 arranged on the drilling rod 11 and a driving mechanism for driving the drilling rod 11 to rotate, the real-time monitoring device for pile diameter of high-pressure jet grouting piles comprises a first protection box 2, an ultrasonic probe 3 and a processor 8, the first protective box 2 is arranged on the drilling boom 11 and is positioned below the nozzle 12, the ultrasonic probe 3 is arranged in the first protective box 2, the ultrasonic probe 3 is connected with the wireless signal transmitting device 4, the processor 8 is connected with the wireless signal receiving device 5, and the wireless signal transmitting device 4 is connected with the wireless signal receiving device 5.
When the high-pressure jet grouting pile is constructed, the mixed fluid formed by mixing slurry sprayed by the spray nozzle 12 and soil in the pile forming diameter range is solid soil outside the pile forming diameter range, ultrasonic waves emitted by the ultrasonic probe 3 can be reflected at a fluid-solid interface between the mixed fluid and the solid soil, and the ultrasonic probe 3 receives the reflected waves and generates low-pressure signals. In an embodiment, the two ends of the ultrasonic probe 3 are provided with third connecting rods 6, and the third connecting rods 6 are connected with the first protection box 2 through a plurality of elastic pieces 7. The spring can be adopted to the elastic component 7, and ultrasonic probe 3's both ends are connected with first protection box 2 through third connecting rod 6 and a plurality of elastic component 7 respectively, can play the absorbing effect, reduce the vibrations that bore spray lance 11 rotates, decline and the promotion process produced to ultrasonic probe 3's influence, guarantee ultrasonic probe 3's measurement accuracy and increase of service life. Meanwhile, in order to avoid muddy water from penetrating into the first protection box 2, in one embodiment, a rubber ring 21 is arranged on one side of the first protection box 2 close to the drilling rod 11. The sealing of the first protective box 2 is ensured by the connection of the rubber ring 21 with the drill boom 11. Preferably, the first protection box 2 is detachably mounted on the drill boom 11 through a screw and a nut, so that the first protection box 2 and the drill boom 11 can be detached, and the ultrasonic probe 3 can be replaced conveniently.
The ultrasonic probe 3 outputs the generated low-pressure signal to the processor 8 through the wireless signal transmitting device 4 and the wireless signal receiving device 5, and the processor 8 calculates the pile-forming diameter of the high-pressure jet grouting pile in real time according to the received signal. In an embodiment, the drilling and spraying rod 11 comprises an upper pipe section 111, a first connecting pipe section 112, a middle pipe section 113, a second connecting pipe section 114 and a lower pipe section 115 which are sequentially connected, wherein the first connecting pipe section 112 and the second connecting pipe section 114 are hollow, the wireless signal receiving device 5 is arranged in the first connecting pipe section 112, a first connecting hole is formed in the outer wall of the second connecting pipe section 114, the wireless signal transmitting device 4 is arranged in the second connecting pipe section 114, the first protection box 2 is arranged on the second connecting pipe section 114, a second connecting hole corresponding to the first connecting hole is formed in one side, close to the second connecting pipe section 114, of the first protection box, and the ultrasonic probe 3 sequentially penetrates through the second connecting hole and the first connecting hole through wires to be electrically connected with the wireless signal transmitting device 4. This setting is convenient for install wireless signal emitter 4, wireless signal receiver 5 and first protective case 2 to ultrasonic probe 3 passes through the wire and is connected with wireless signal emitter 4, guarantees signal transmission's reliability. Preferably, the first connecting tube section 112 is connected to the upper tube section 111 and the middle tube section 113 by a screw-fit, respectively, and the second connecting tube section 114 is connected to the middle tube section 113 and the lower tube section 115 by a screw-fit, respectively.
Specifically, in one embodiment, the wireless signal transmitting device 4 includes a second protection box 41, an electromagnetic signal transmitting coil 42 and a circuit amplifying module 43, the second protection box 41 is disposed at the top end inside the second connection pipe section 114, the electromagnetic signal transmitting coil 42 is vertically disposed in the second protection box 41, and the circuit amplifying module 43 is disposed in the second protection box 41 and is electrically connected with the electromagnetic signal transmitting coil 42 and the ultrasonic probe 3 through wires, respectively; the wireless signal receiving device 5 includes a third protection box 51, an electromagnetic signal receiving coil 52 and an output signal interface 53, the third protection box 51 is disposed in the first connection pipe section 112, the electromagnetic signal receiving coil 52 is vertically disposed in the third protection box 51, the output signal interface 53 is disposed outside the first connection pipe section 112, and is electrically connected with the electromagnetic signal receiving coil 52 through a wire, and the processor 8 is electrically connected with the output signal interface 53. The circuit amplification module 43 amplifies the low-voltage signal generated by the ultrasonic probe 3 into a high-voltage signal and transmits the high-voltage signal to the electromagnetic signal transmitting coil 42, and the electromagnetic signal transmitting coil 42 converts the high-voltage signal into a magnetic field that penetrates the first connection pipe section 112, the slurry in the drilling boom 11, and the second connection pipe section 114 to reach the electromagnetic signal receiving coil 52. The electromagnetic effect excitation magnetic field is used as a signal carrier, slurry in the drilling and spraying rod 11 is used as a medium to transmit the magnetic field, so that loss in the geomagnetic propagation process can be effectively reduced, the signal transmission accuracy is ensured, and a colleague amplifies a low-voltage signal into a high-voltage signal through the circuit amplification module 43 so as to ensure that the electromagnetic signal transmitting coil 42 can generate a magnetic field with enough strength. Further, the first and second connector segments 112, 114 may be made of a material that has little effect on the propagation of the magnetic field. In an embodiment, the electromagnetic signal transmitting coil 42 is connected with the second protection box 41 through the plurality of first connecting rods 44, so that the central axis of the electromagnetic signal transmitting coil 42 coincides with the central axis of the drilling rod 11, the electromagnetic receiving device is connected with the third protection box 51 through the plurality of second connecting rods 55, and the third protection box 51 is connected with the first connecting tubes through the plurality of steel wires 54, so that the central axis of the electromagnetic signal receiving coil 52 coincides with the central axis of the drilling rod 11, thereby reducing the change of the receiving magnetic field caused by the position change, and effectively reducing the obstruction to the slurry transmission while achieving the fixing effect.
The electromagnetic signal receiving coil 52 outputs the received magnetic field as an electrical signal, which is transmitted to the processor 8 through the output signal interface 53. The signal output of the electromagnetic signal receiving coil 52 is provided with an output signal interface 53 for connection to the processor 8. In one embodiment, a steel sleeve 56 is sleeved outside the wire connected between the output signal interface 53 and the electromagnetic signal receiving coil 52, one end of the steel sleeve 56 is connected with the third protection box 51, and the other end is connected with the first connecting pipe section 112. The steel sleeve 56 may serve to protect the wires. The processor 8 receives and processes the electric signal transmitted by the electromagnetic signal receiving coil 52 to obtain the time difference between the ultrasonic wave emitted by the ultrasonic probe 3 and the reflected wave received, and multiplies the time difference by the propagation speed of the corresponding ultrasonic wave to obtain the pile-forming diameter of the high-pressure jet grouting pile. In an embodiment, the processor 8 includes a processing chip and a display coupled to the processing chip. The processing chip receives the electric signal transmitted by the electromagnetic signal receiving coil 52 and processes and calculates the pile forming diameter of the high-pressure jet grouting pile, and transmits the calculated result to the display for display, so that constructors can visually check the pile forming diameter of the high-pressure jet grouting pile, and constructors can conveniently control the pile forming diameter of the high-pressure jet grouting pile.
The invention also provides a real-time monitoring method for the pile forming diameter of the high-pressure jet grouting pile, which comprises the following steps:
s1, drilling and sampling a target site, crushing soil samples of different stratum obtained by sampling, pouring the crushed soil samples into a cylinder, adding slurry into the cylinder according to a preset design proportion, and stirring to form a first mixed fluid, wherein the diameter of the cylinder is the same as the design diameter of a high-pressure jet grouting pile;
s2, stretching the ultrasonic probe 3 into the first mixed fluid for measurement, and detecting whether the ultrasonic probe 3 can receive reflected waves or not;
S3, if yes, determining the transmitting frequency of the current ultrasonic probe 3 as the working transmitting frequency;
S4, respectively crushing the sampled soil samples of different strata, respectively adding the crushed soil samples and the slurry specified by the preset design into different cylinders, and stirring to form second mixed fluid corresponding to each stratum;
S5, for the second mixed fluid corresponding to each stratum, the ultrasonic probe 3 is stretched into the second mixed fluid, and the ultrasonic probe 3 is controlled to emit working ultrasonic waves at a working emission frequency, so that the propagation speed of the working ultrasonic waves in each second mixed fluid is obtained;
S6, in the process of drilling holes under the drilling boom 11, controlling the ultrasonic probe 3 to emit working ultrasonic waves at a working emission frequency, acquiring the time difference between the working ultrasonic waves emitted by the ultrasonic probe 3 and the reflected waves received by the ultrasonic probe 3 in real time, acquiring the propagation speed of the working ultrasonic waves in a second mixed fluid corresponding to a target soil layer according to the current target soil layer of the ultrasonic probe 3, and calculating the pile forming diameter of the high-pressure jet grouting pile in real time.
The drilling and sampling are carried out on the target site to be constructed, so that the geological condition of each soil layer which is required to be inserted in the target site for constructing the high-pressure jet grouting pile can be determined, for example, five soil layers which are respectively a soil layer A, a soil layer B, a soil layer C, a soil layer D and a soil layer E are required to be inserted in the construction of the high-pressure jet grouting pile, and meanwhile, the soil sample of each soil layer is obtained. The soil sample of each soil layer is crushed and poured into a cylinder respectively, the cylinder is compacted to the same compactness as the undisturbed soil, the diameter of the cylinder is based on the diameter of a pile, the thickness of the soil sample at least meets the detection requirement, and the upper part of the cylinder is reserved with at least 0.2m space for temporary storage and slurry return. The slurry for constructing the high-pressure jet grouting pile is formed by mixing according to a preset design proportion, and is stirred with soil layers in the cylinder to form a first mixed fluid so as to simulate the pile forming process of the high-pressure jet grouting pile, wherein 42.5-grade fresh ordinary Portland cement can be adopted as the slurry, and the cement consumption is 200kg/m. Then, the ultrasonic probe 3 is used for measurement, in the process of measurement, whether the ultrasonic probe 3 can measure reflected waves is detected, if the ultrasonic probe 3 can measure reflected waves, the ultrasonic waves emitted by the ultrasonic probe 3 can penetrate through the mixed fluid, so that the emission frequency of the ultrasonic probe 3 can be used as the emission frequency used by an implementation technician at present, namely, the working emission frequency. Of course, in determining the operation transmission frequency of the ultrasonic probe 3, the transmission frequency of the ultrasonic probe 3 may be adjusted, and the transmission frequency with the smallest frequency among the transmission frequencies at which the reflected waves can be detected by the plurality of ultrasonic probes 3 is selected as the operation transmission frequency.
After determining the operating transmission frequency of the ultrasonic probe 3, since the propagation speeds of the ultrasonic waves in different mediums are different, it is necessary to determine the propagation speed of the ultrasonic waves transmitted by the ultrasonic probe 3 at the operating transmission frequency in each soil layer. Respectively crushing a soil sample of each soil layer, pouring the crushed soil sample into different cylinders, mixing slurry in each cylinder according to a preset design proportion, and stirring to obtain second mixed fluids corresponding to different soil layers, wherein specifically, the second mixed fluid corresponding to the soil layer A is A1, the second mixed fluid corresponding to the soil layer B is B1, the second mixed fluid corresponding to the soil layer C is C1, the second mixed fluid corresponding to the soil layer D is D1, and the second mixed fluid corresponding to the soil layer E is E1. The propagation time is then obtained by penetrating the ultrasonic waves of the working emission frequency through a fixed thickness of A1, B1, C1, D1, and E1, and the propagation speeds V A1、VB1、VC1、VD1 and V E1 of the ultrasonic waves of the working emission frequency in each of the second mixed fluids can be calculated.
In the construction of the high-pressure rotary pile, in the process that the drilling boom 11 drills down the hole, the ultrasonic probe 3 emits working ultrasonic waves at a working frequency, the time difference Deltat between the emission of the working ultrasonic waves by the ultrasonic probe 3 and the reception of reflected waves is measured by the timer, the time difference Deltat is transmitted back to the processor 8 through the electromagnetic signal emitting coil 42 and the electromagnetic signal receiving coil 52, the processor 8 obtains the propagation speed of the working ultrasonic waves in a second mixed fluid corresponding to the target soil layer according to the target soil layer where the ultrasonic probe 3 is located, for example, the soil layer where the ultrasonic probe 3 is located is the soil layer A, the soil layer A is the target soil layer, so that the propagation speed V A1 of the working ultrasonic waves in the second mixed fluid A1 corresponding to the soil layer A is obtained, and the pile forming diameter of the high-pressure rotary pile is calculated in real time according to S=V. Different soil layers B, C, D and E are drilled in the process of drilling holes by the drilling boom 11, and the pile forming diameter of the high-pressure jet grouting pile is calculated in real time according to the process. The constructor can control the construction parameters according to the pile forming diameter of the high-pressure jet grouting pile obtained in real time, when the pile forming diameter S is smaller than the designed pile forming diameter, the grouting pressure of the nozzle 12 is increased, the rotation speed of the drilling and spraying rod 11 is slowed down, and when the pile forming diameter S reaches the designed diameter, the drilling and spraying rod 11 is lifted.
Compared with the prior art, the invention has the beneficial effects that: the ultrasonic probe 3 can detect the position of the fluid-solid interface, and outputs signals measured in real time to the processor 8 through the wireless signal transmitting device 4 and the wireless signal receiving device 5, and the processor 8 calculates the pile diameter of the high-pressure jet grouting pile according to the received signals, so that the pile diameter of the high-pressure jet grouting pile is monitored in real time, potential safety hazards caused by insufficient pile diameter of the high-pressure jet grouting pile can be avoided, and material waste caused by overlarge pile diameter of the high-pressure jet grouting pile can be avoided; the invention has wide applicability, can be suitable for single-pipe method, double-pipe method and three-pipe method, ensures that the pile forming diameter of the high-pressure jet grouting pile meets the design requirement, and can effectively improve the construction quality of the high-pressure jet grouting pile.
The present invention is not limited to the preferred embodiments, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present invention will still fall within the scope of the technical solution of the present invention.
Claims (9)
1. The high-pressure jet grouting pile forming diameter real-time monitoring method is characterized by comprising a high-pressure jet grouting pile forming diameter real-time monitoring device arranged on a drilling machine, wherein the drilling machine comprises a drilling and spraying rod, a nozzle arranged on the drilling and spraying rod and a driving mechanism for driving the drilling and spraying rod to rotate, the device comprises a first protection box, an ultrasonic probe and a processor, the first protection box is arranged on the drilling and spraying rod and is positioned below the nozzle, the ultrasonic probe is arranged in the first protection box, the ultrasonic probe is connected with a wireless signal transmitting device, and the processor is connected with a wireless signal receiving device;
The method comprises the following steps:
Drilling and sampling a target site, crushing soil samples of different stratum obtained by sampling, pouring the crushed soil samples into a cylinder, adding slurry into the cylinder according to a preset design proportion, and stirring to form a first mixed fluid, wherein the diameter of the cylinder is the same as the design diameter of a high-pressure jet grouting pile;
the ultrasonic probe is stretched into the first mixed fluid for measurement, and whether the ultrasonic probe can receive reflected waves or not is detected;
If yes, determining the transmitting frequency of the current ultrasonic probe as the working transmitting frequency;
Respectively crushing the sampled soil samples of different strata, respectively adding the crushed soil samples and the slurry specified by the preset design into different cylinders, and stirring to form second mixed fluid corresponding to each stratum;
For the second mixed fluid corresponding to each stratum, an ultrasonic probe is extended into the second mixed fluid, and the ultrasonic probe is controlled to emit working ultrasonic waves at a working emission frequency, so that the propagation speed of the working ultrasonic waves in each second mixed fluid is obtained;
in the process of drilling a hole under a drilling and spraying rod, controlling an ultrasonic probe to emit working ultrasonic waves at a working emission frequency, acquiring the time difference between the sending of the working ultrasonic waves and the receiving of reflected waves by the ultrasonic probe in real time, acquiring the propagation speed of the working ultrasonic waves in a second mixed fluid corresponding to a target soil layer according to the current target soil layer of the ultrasonic probe, and calculating the pile forming diameter of the high-pressure jet grouting pile in real time.
2. The method for monitoring the diameter of a high-pressure jet grouting pile according to claim 1, wherein the drilling and jet grouting rod comprises an upper pipe section, a first connecting pipe section, a middle pipe section, a second connecting pipe section and a lower pipe section which are sequentially connected, the first connecting pipe section and the second connecting pipe section are hollow, the wireless signal receiving device is arranged in the first connecting pipe section, a first connecting hole is formed in the outer wall of the second connecting pipe section, the wireless signal transmitting device is arranged in the second connecting pipe section, the first protection box is arranged on the second connecting pipe section, a second connecting hole corresponding to the first connecting hole is formed in one side, close to the second connecting pipe section, of the drilling and jet grouting rod, and the ultrasonic probe sequentially penetrates through the second connecting hole and the first connecting hole through wires to be electrically connected with the wireless signal transmitting device.
3. The method for monitoring the pile forming diameter of the high-pressure jet grouting pile in real time according to claim 2, wherein the wireless signal transmitting device comprises a second protection box, an electromagnetic signal transmitting coil and a circuit amplifying module, the second protection box is arranged at the top end of the interior of the second connecting pipe section, the electromagnetic signal transmitting coil is vertically arranged in the second protection box, and the circuit amplifying module is arranged in the second protection box and is electrically connected with the electromagnetic signal transmitting coil and the ultrasonic probe through leads respectively;
The wireless signal receiving device comprises a third protection box, an electromagnetic signal receiving coil and an output signal interface, wherein the third protection box is arranged in the first connecting pipe section, the electromagnetic signal receiving coil is vertically arranged in the third protection box, the output signal interface is arranged on the outer side of the first connecting pipe section and is electrically connected with the electromagnetic signal receiving coil through a wire, and the processor is electrically connected with the output signal interface.
4. A method for monitoring pile forming diameter of high pressure jet grouting pile in real time according to claim 3, wherein the third protection box is connected with the first connecting pipe through a plurality of steel wires.
5. The method for monitoring pile forming diameter of high-pressure jet grouting pile in real time according to claim 3, wherein the electromagnetic signal transmitting coil is connected with the second protection box through a plurality of first connecting rods, and the electromagnetic signal receiving coil is connected with the third protection box through a plurality of second connecting rods.
6. The method for monitoring pile forming diameter of high-pressure jet grouting pile in real time according to claim 3, wherein a steel sleeve is sleeved outside a wire connected between the output signal interface and the electromagnetic signal receiving coil, one end of the steel sleeve is connected with the third protection box, and the other end of the steel sleeve is connected with the first connecting pipe section.
7. The method for monitoring the pile forming diameter of the high-pressure jet grouting pile in real time according to claim 1, wherein the ultrasonic probe is provided with third connecting rods at two ends, and the third connecting rods are connected with the first protection box through a plurality of elastic pieces.
8. The method for monitoring pile forming diameter of high-pressure jet grouting piles in real time according to claim 1, wherein a rubber ring is arranged on one side of the first protection box, which is close to the drilling rod.
9. The method for monitoring the diameter of the high-pressure jet grouting pile in real time according to claim 1, wherein the processor comprises a processing chip and a display connected with the processing chip.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106759299A (en) * | 2017-02-26 | 2017-05-31 | 北京中岩大地科技股份有限公司 | A kind of controllable churning technique in stake footpath |
| CN112228038A (en) * | 2020-09-29 | 2021-01-15 | 中铁大桥局集团有限公司 | An intelligent drilling and online detection system for large-diameter bored piles |
| CN215485989U (en) * | 2021-03-23 | 2022-01-11 | 中交第四航务工程局有限公司 | Pile-forming diameter real-time monitoring device for high-pressure jet grouting pile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102011399B (en) * | 2010-11-05 | 2012-11-28 | 河南理工大学 | PHC pile-based multiple high jet pedestal pile construction method |
| EP2543770B1 (en) * | 2011-07-06 | 2014-01-22 | GuD Geotechnik und Dynamik GmbH | Method and device for measuring nozzle beams underground |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106759299A (en) * | 2017-02-26 | 2017-05-31 | 北京中岩大地科技股份有限公司 | A kind of controllable churning technique in stake footpath |
| CN112228038A (en) * | 2020-09-29 | 2021-01-15 | 中铁大桥局集团有限公司 | An intelligent drilling and online detection system for large-diameter bored piles |
| CN215485989U (en) * | 2021-03-23 | 2022-01-11 | 中交第四航务工程局有限公司 | Pile-forming diameter real-time monitoring device for high-pressure jet grouting pile |
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